Abstract:
A method of assembling a large-size plant and an assembling method for reducing a term of work are disclosed. Each of a crane operator in a crane operation room and site workers in a plant construction site is equipped with a picture I/O device and a voice I/O device. The crane operator and the site workers assemble the plant while sharing picture information of the picture I/O device and voice information of the voice I/O device with each other. A site remote control room vicinal to the plant construction site is connected via a radio transmission path to a host control center. The plant si assembled while the site workers, the crane operator room, the site remote control room and the central control room share the picture information and the voice information of their own with each other.

Description:
FIELD OF THE INVENTION 
     The present invention relates to a method of assembling a plant to reduce a term of a plant construction work requiring a high-level technology and high construction expenditures as in the case of a light water cooling type nuclear power plant, or to reduce a periodical plant inspection time during its working period. 
     RELATED BACKGROUND ART 
     A construction of a light water cooling type nuclear power plant starts with an excavation down to a base rock, and involves a work of laying out a central mat and an outer peripheral mat thereon, a work of installing a reactor containment concrete vessel (RCCV) and a building outer peripheral structures on the respective mats, a work of subsequently installing a reactor pressure vessel (RPV) into the reactor containment concrete vessel and arranging a pipe system thereto, and a work of installing appliances in the building outer peripheral structure and arranging a pipe system thereto. When these works are finished, a commercial operation begins via a system test, a fuel charge and a start-up test. A term of work extending from the start of constructing the nuclear power plant to the start of the commercial operation may be as long as 60 months (5 years). 
     By contrast, a construction term of a gas turbine combined power plant may be approximately 36 months (3 years) shorter by approximately 24 months than the 60-months construction term of the nuclear power plant. Further, the nuclear power plant is complicated in terms of system and large of a quantity of the materials, and therefore requires large construction expenditures. Besides, the nuclear power plant adopts such a structure that the foundation is constructed directly on the base rock as a measure against an earthquake, and hence a term of excavation work tends to become long. Therefore, the construction of the nuclear power plant is disadvantageous in terms of an economic aspect because of an interest for the construction expenditures which will be produced for the long period of construction and a loss of profits which might be obtained by implementing a commercial operation. An electric power supplier incapable of raising large initial investment funds has a tendency not to select the nuclear power plant because of the initial construction expenditures being high even if the power production expenditures can be totally reduced due to comparatively low operation expenditures after constructing the nuclear power plant. Such being the case, if the construction term can be decreased, the initial investment funds can be, even if large, returned at an early stage, and therefore a strong desire for constructing the nuclear power plant might be invoked. 
     In the construction of a skyscraper in recent years, there has been adopted a construction method contrived to reduce the construction term by performing a ground work and an underground work in parallel with increases in size and depth of the underground structure. 
     With an insight into a decreasing tendency of the working population, there will be, it is predicted, increased a demand for performing the work depending on inexperienced man power, the aged and female laborers. In this case, it is required to introduce such a construction system that a mass production becomes attainable by adopting a belt-conveyor based flow production system for assembling, e.g., an automobile and employing the inexperienced laborers suited to this system. It is also necessary to provide a working environment which is much easier to work with a less proportion of physical labor. 
     At present, a progress of the semiconductor technology is so fast, and a high-performance microcomputer can be commercially available. The situation is that a system capable of transmitting multi-information including picture information is going to be readily obtained at a low price. In the majority of cases, a construction work or a periodical inspection work of the plant during its operation is carried out in cooperation, and it is of importance in terms of enhancing an work efficiency to share the information. In such a case, it is effective in terms of enhancing the work efficiency to share the picture information because of easily obtaining a recognition about an object to which the attention is paid. It has been difficult technically and in terms of the price to obtain the picture information, however, this obtainment is going to be possible with the progress in the electronic technology in recent years. The technology relative to the picture information is effective in extending a capability of a manager, and it is feasible to proceed the cooperative work among a multiplicity of inexperienced laborers by utilizing this technology, which can further enhance the work efficiency. 
     At present, there is developed a technology aiming at improving an availability factor by reducing the periodical inspection period of a light water cooling type nuclear power plant, whereby the periodical inspection period having hitherto required 60 days (2 months) or longer is going to be decreased down to approximately 20 days. What constitutes a principal critical path during the periodical inspection period of the reactor system in the nuclear power plant, is a fuel handling work and a control rod driving mechanism handling work. For reducing the terms of these works, a remarkable reduction in the periodical inspection period is attained by performing the works in parallel, conducting the works with an exchange for preparatory parts at a time other than the periodical inspection period and speeding up a handling work machine. Further, a one-day unit working process management having hitherto been adopted is changed to an hour-unit management system, or a 3-shift 24-hours working system is adopted, and the work waiting time is obviated, whereby the reduction in the working time is going to be attained. From now into the future, it is a vital technical matter to enhance the efficiency of the cooperative work between a site work manager, site workers and a crane operator. 
     When speeding up the fuel handling work and the control rod driving mechanism handling work, a plurality of works are combined to constitute one work, and hence there might arise a necessity for executing a minute- or second-unit time management for the work having hitherto used the hour-unit time management in order to speed up the work. A judgement of the worker and a work of transmitting the information are to be done in between a combination of the plurality of works, and it is therefore an important matter to reduce a time of the worker making the judgement and a time of transmitting the information in the minute- or second-unit time management. Among the work items of the periodical inspection of the reactor system which exclude the fuel handling work and the control rod driving mechanism handling work, the principal work item is a preparation work for installing and removing the work appliances. It is a vital matter to decrease the time of transmitting the information between the workers and the time of making the judgement in this preparation work. In the case of reducing the periodical inspection period by conducting the minute- or second-unit time management, it is required that this inspection period be reduced by supporting the fields relative to the capabilities of the workers. 
     SUMMARY OF THE INVENTION 
     It is a primary object of the present invention to provide a method of assembling a plant, which is capable reducing a term of construction work or a inspection period of a large-size plant such as a light water cooling type nuclear power plant. 
     It is another object of the present invention to provide a method of assembling a plant, which is capable of synthetically managing a construction work or an inspection of the large-size plant, of which the work is proceeded by a multiplicity of managers and workers in cooperation, and also capable of reducing a term of construction work or an inspection period of the large-size plant. 
     To accomplish the above objects, according to one aspect of the present invention, a method of assembling a plant comprises a step of making each of a crane operator in a crane operation room and a site worker in a plant construction site equipped with a picture I/O device and a voice I/O device, a step of performing a work of assembling the plant while the crane operator shares picture information of the picture I/O device and voice information of the voice I/O device with the site worker, a step of connecting a site remote control room proximal to the plant construction site to a host control center via a radio transmission path, and a step of assembling the plant while the site worker, the crane operation room, the site remote control room and the control center share the picture information and voice information of their own with each other. 
     These together with other objects and advantages which will be subsequently apparent, reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming a part hereof, wherein like numerals refer to like parts throughout. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     In the accompanying drawings: 
     FIG. 1 is an explanatory view of a system architecture, showing a working method carried out sharing picture information according to the present invention; 
     FIG. 2 is an explanatory view of a layout of appliances in a construction site, showing a situation in which a work of installing a reactor pressure vessel and an excavation work are conducted in parallel; 
     FIG. 3 is a view showing a state of the site in which to install a heavy structure sharing the picture information; 
     FIG. 4 is a front view showing a state where a site worker wears a helmet equipped with a picture information terminal device and a voice terminal device; 
     FIG. 5 is a side view taken along the line V—V in FIG. 4; 
     FIG. 6 is a view showing an example of a screen on a monitor TV in a crane operation room; 
     FIG. 7 is a block diagram showing an information transmission system in the picture information shared installation work; 
     FIG. 8 is a flowchart showing a procedure of creating a synthetic picture relative to a work condition in a unit installation site; 
     FIG. 9 is a flowchart showing a procedure of creating the synthetic picture relative to the work condition in the unit installation site by utilizing self-position information; 
     FIG. 10 is a block diagram of an information transmission system in which a cooperative work is performed by transmitting the synthetic picture and voice information obtained in a plant construction method to a site remote control room and a control center; and 
     FIG. 11 is a block diagram showing the information transmission system when performing a work of fixing the unit in cooperation by the site remote control room controlling the picture information of the work in the site. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     FIG. 1 is an explanatory view of a system architecture, showing a working method according to the present invention which is carried out involving the use of vide information. Illustrated in FIG. 1 is a working site in which a plant is constructed by using a crane , a site remote control room  2 , and a control center  3 . Information can be exchanged between the site remote control room  2  and the control center  3  via a communication satellite  4 . The working site  1  is equipped with a ceiling crane  5  having an operation room  6 , in which an installation unit  7  is installed by use of the ceiling crane  5 . A plurality of site workers  8  are posted in an installation site. An operator (not shown) who operates the ceiling crane  5  is stationed in the operation room  6 . Each of the site workers  8 , as will be described later on, must wear a helmet equipped with a TV camera and a line-of-sight detector, and carries a portable monitor TV. The helmet is fitted with a tag of a worker&#39;s name, or a peculiar label as a substitute therefor, or alternatively a self-position measuring unit. The installation unit  7  is attached with a TV camera  10  using a battery type CMOS sensor and a self-position measuring device. Picture information given from the TV camera  10  and self-position information from the self-position measuring device, are wirelessly transmitted to an antenna  67 . The ceiling crane  5  is fitted with a TV camera  9  for imaging the installation unit  7 . 
     The picture information obtained by the TV camera of the site worker  8  and line-of-sight position information obtained by the line-of-sight detector, are wirelessly transmitted a transportable side information relay device  42  (unillustrated) installed in the vicinity of the working site, and further wirelessly transmitted from the side information relay device  42  to the antenna  67 . These pieces of information are then transmitted from the antenna  67  to a an image processor (not shown) installed in the operation room  6  of the ceiling crane  5 . The image processor synthesizes images obtained through the TV cameras  9 ,  10  with the line-of-sight position information on the operator in the operation room  6 , thereby creating a synthetic image with the line-of-sight position information. This synthetic image is transmitted to the portable monitor TV of the site worker  8  via the site information relay device  42  from the antenna  67 . 
     Further, the synthetic image is also transmitted to the site remote control room  2  via a transmission line  139 . The site remote control room  2  is equipped with a large-size multi-screen  11 , a computer system  68  and a console  13 . A manager  12  sitting at the console  13  manages an installing work in the working side  1 , schedules of transmitting design data for support and carrying materials while watching the images on the large-size multi-screen  11 . It is assumed that the manager  12  puts on the line-of-sight detector. The synthetic image transmitted from the working site  1  is projected on the multi-screen  11 , and the detection information of the line-of-sight detector of the manager  12  sitting at the console  13  is also synthesized and displayed thereon. The line-of-sight position information of the manager  12  is transmitted to the image processor installed in the operation room  6  of the ceiling crane  5 , and additionally synthesized with the synthetic image. The synthetic image projected on the multi-screen is displayed while being synthesized with a detected result of a light-of-sight position of a manager  15 . The line-of-sight position information of the manager  15  is transmitted also to the image processor installed in the operation room  6  of the ceiling crane  5 , and additionally synthesized with the synthetic image thereof and thus displayed. 
     The control center  3  is equipped with a large-size multi-screen  14 , a computer system  71  and an operation table  16 . The manager  15  sitting at the operation table  16  compares a working state at the working site  1  with design specifications and thus evaluates the working state while watching the synthetic image of the working site  1  which has been projected on the multi-screen  14 , and modifies the design and reviews the arrangement for the materials. The information of the line-of-sight detector of the manager  15  sitting at the operation table  16  is synthetically displayed on the multi-screen  14 . The line-of-sight position information of the manager  15  in the site remote control room  2  is transmitted to the image processor installed in the operation room  6  of the ceiling crane  5  as well as to the multi-screen  11  in the same room  2 , and is additionally synthesized with the synthetic image. 
     FIG. 2 shows a situation in which a reactor pressure vessel installing work and an excavation work are carried out in parallel. Shown herein as an example of installing a large-size assembly unit is a situation of how a reactor pressure vessel  20  is installed in a pedestal  21  of a nuclear reactor building  17  by use of a crawler crane  19 . A battery type TV camera  26  for wirelessly transmitting the projected image and the self-position measuring device (not shown), are installed downwardly of the reactor pressure vessel  20 . The crawler crane  19  is fitted with a TV camera  27  for imaging from above the reactor pressure vessel  20  suspended, and an antenna  74  for transmitting and receiving voice information and picture information wirelessly transmitted. A video signal received by the antenna  74  is transmitted to a picture/image processor (not shown) installed in an operation room  28  of the crawler crane  19 . 
     The site workers (not shown) wearing the helmets provided with the TV cameras (CMOS sensor-assisted TV cameras or CCD cameras) and the line-of-sight detectors, stand by along the periphery of an upper edge of the pedestal  21 . The video signals obtained by the imaging processes of the site workers and the line-of-sight position information given from the line-of-sight detectors thereof, are transmitted to the picture/image processor installed in the operation room  28  of the crawler crane  19  via the antenna  74 . The picture/image processor generates a synthetic picture obtained by synthesizing pictures given from the TV cameras  26 ,  27 , with video signals and line-of-sight position information which are obtained by the site workers and line-of-sight position information of an operator of the crawler crane  19 . This synthetic picture is transmitted to the portable monitor TVs of the site workers as well as to the monitor TV in the operation room  28  of the crawler crane  19 . This synthetic picture is transmitted also to the site remote control room  2  and the control center  3 , and pieces of the line-of-sight position information of the managers  12 ,  15  are additionally synthesized with the synthetic picture according to the necessity. 
     Exemplified by way of one example of such a work that a building construction, installations of appliances, and an excavation work proceed in parallel, is a method of constructing bases  72 ,  73  on a caisson  29 , then excavating the area under the caisson  29  while constructing the reactor building  17  and a turbine building  18  on the bases, and further sinking the caisson  29  corresponding to a progress of the excavation. The excavation of the area under the caisson  29  involves the use of a ceiling traveling type excavating device  30  and a crawler type excavating device (not shown), and surplus soil of the excavation is put into a surplus soil carry container  31  and raised above the ground surface by use of ceiling cranes  32 ,  33  via carry-in/carry-out devices  35 ,  36  secured to the caisson  29 . The surplus soil is then loaded into the carrier device  34  and discharged into a surplus soil leaving place. When the surplus soil carry container  31  passes through the carry-in/carry-out devices  35 ,  36 , the site workers posted thereabout and wearing the helmets attached with the TV cameras and the line-of-sight detectors conduct slinging works of the ceiling cranes  32 ,  33 . When the surplus soil carry container  31  is mounted in the carrier device  34 , the operator, putting on the helmet equipped with the TV camera and the line-of-sight detector, of the carry device  34  performs the slinging works of the ceiling cranes  32 ,  33 . An operation room of the ceiling cranes  32 ,  33  is provided with a picture information processor for generating a synthetic picture by executing a process of synthesizing pictures of TV cameras  78 ,  79  fitted to the ceiling cranes  32 ,  33 , pictures of TV cameras  80 ,  81  fitted to the surplus soil carry container  31  and pictures imaged by the site workers and the operator with the line-of-sight position information. This synthetic picture is transmitted to the monitor TV installed in the operation room of the ceiling cranes  32 ,  33  and to the portable monitor TVs of the site workers and the operator. The operator performs the carrying work of the surplus soil carry container  31  while watching the monitor TV. 
     FIG. 3 illustrates a state of the site in which to install a heavy weight substance, sharing the picture information. FIG. 3 shows a state of site workers (A, B)  40 ,  41  putting on the helmets fitted with the TV cameras and the line-of-sight detectors, monitor how a first installation unit  38  is installed to an already-fixed second installation unit  39  by using the crane  32 . Designated by the numerals  43 ,  44  in FIG. 3 are pictures of the installation units  38 ,  39  imaged by the TV cameras  53 ,  54 . Pieces of picture information relative to the pictures  43 ,  44  and the line-of-sight position information of the site workers, are wirelessly transmitted to a installation site information relay device  42  via antennas  51 ,  52 , and further wirelessly transmitted from the installation site information relay device  42  to an antenna (unillustrated) attached to the crane  32 . The above picture information and the line-of-sight position information are then synthesized with the picture imaged by the TV camera fitted to the crane by the picture information processor installed in the operation room of the crane. The synthetic picture thereof is transmitted ti the monitor TV of the crane operation room and the portable TV cameras of the site workers  40 ,  41  via a reverse route. Helmets  49 ,  50  of the site workers  40 ,  41  are attached with antennas  51 ,  52 . Peculiar identification labels are stuck to the tips of the antennas  51 ,  52  or the surfaces of the helmets, whereby the crane operator recognizes these labels by watching a picture of the TV camera fitted to the crane  32  and thus identifies the workers projected as a synthetic picture thereon. As the case may be, the site workers  40 ,  41  carry the self-position measuring devices, the self-position measuring device is also fitted to the installation unit, wherein the self-position information may be used for synthesizing the projected picture of the worker with the picture of the installation unit. 
     FIG. 4 is a front view showing a state where the site worker or the crane operator wears a helmet  114  equipped with a pair of stereoscopic vision TV cameras  115 L,  115 R, a line-of-sight detector  116 , a headphone  117  and a microphone  118 . FIG. 5 is a side view as viewed in the direction of the line V—V in FIG.  4 . The TV cameras  115 L,  115 R, the line-of-sight detector  116 , the headphone  117  and the microphone  118  are connected via unillustrated signal lines and power lines, wherein signals are transmitted and received via an antenna  119  fitted to the headphone  117 . Near infrared rays are irradiated from the line-of-sight detector  116  and pass through as well as being reflected by a semi-transparent mirror  120  of which the surface is treated to transmit and reflect the near infrared rays. The near infrared rays thereby fall upon an eyeball of the worker or the operator, whereby a virtual image is formed inside a cornea thereof. The semi-transparent mirror  120  transmits visible light, and hence the site worker and the crane operator are able to directly see the object. 
     FIG. 6 shows an example of a screen on the monitor TV in the crane operation room. As views through the TV camera fitted to the crane, there is shown a situation where a picture of the installation unit  59  in the process of its being installed while being suspended by the crane is centered, and pictures  61 ,  62  imaged by the TV cameras fitted to the helmets of the workers  63 ,  64  standing by around the unit  59  are synthesized therewith in a state in which the installation unit is developed by trigonometry in the positions where the pictures of the workers who imaged the pictures  61 ,  62  exist. When the worker moves in the vicinity of the installation unit  59 , the position in which to synthesize the picture being imaged by the worker must be simultaneously moved. The picture imaged by the worker is indicated by the name of the worker, and the picture of the worker of which the picture is projected on the TV camera attached to the crane is also indicated by the name of the worker. 
     The crane operator adds a follow-up label in the helmet position of the worker whose picture is projected in the TV camera attached to the crane, and identifies the worker by reading the label put on the helmet, and adds a name with a follow-up function to the picture of the worker. Alternatively, the picture of the installation unit is synthesized with the picture imaged by the worker by using the self-position information of the self-position measuring device carried by the wide worker and of the self-position measuring device fitted to the installation unit  59 . 
     A distance between the installation unit  38  and the installation unit  39  is obtained from the design data and the projected picture of the installation unit  38  by use of the pictures  61 ,  62  of the projected workers (A)  40  and (B)  41 . The distance and a value of a rotational deviation angle are displayed in superposition on the pictures  61 ,  62 . 
     FIG. 7 is a block diagram showing an information transmission system in the picture information sharing installation work according to the present invention. FIG. 7 shows a case of conducting a work of installing a large-size unit by use of a crane  82 , wherein the information is transmitted between an installation unit  90 , an installation site  86 , the crane  821  and the site remote control room  2 . A crane operator  84  is stationed in a crane operation room  83  provided in the crane  82 , and a site worker  87  putting on a helmet  88  is posted in the installation site  86 . 
     The crane  82  is fitted with a TV camera  92  for imaging the installation unit  90 , and the crane operation room  83  is equipped with a monitor TV  93 , an image processor  94  and a radio transmitter/receiver  95 . An imaging signal of the TV camera is transmitted via a wire to the image processor  94 . The radio transmitter/receiver  95  is used for performing the radio transmission/receipt between the installation unit  90  and the installation site  86 . Image signals from a TV camera  99  and a line-of-sight detector  100  attached to the helmet  85  of the crane operator  84  are transmitted via an image processor  103  to the radio transmitter/receiver  98 . Voice signals of a microphone  101  and a headphone  102  are transmitted via a voice processor  104  to the radio transmitter/receiver  98 . The information is wirelessly transmitted and received between the radio transmitter/receiver  98  and the radio transmitter/receiver  95  of the crane operation room  83 . A helmet  88  of the site worker  87  is, as in the case of the helmet  85  of the crane operator  84 , provided with a TV camera  105  and a line-of-sight detector  106 . Image signals from the TV camera  105  and the line-of-sight detector  106  are transmitted via an image processor  109  to a radio transmitter/receiver  111 . Voice signals from a microphone  107  and a headphone  108  are transmitted via a voice processor  110  to the radio transmitter/receiver  111 . The information is wirelessly transmitted and received between the radio transmitter/receiver  111  and the radio transmitter/receiver  97  of the site information relay device  92 . Note that the radio transmitter/receiver  111  is connected to a portable monitor TV  113  attached to an arm  112  opposite to a dominant arm and also to a self-position measuring device  122  attached to a waist part  127 . The TV camera  91  incorporated into the installation unit  90  and the self-position measuring device  122  are connected to a radio transmitter  96 . The information can be transmitted to the radio transmitter/receiver  95  of the crane operation room  83  from the radio transmitter  96 . Various items of information collected by the crane operation room  83  via the radio transmitter/receiver  95  are transmitted via the image processor  94  to the site remote control room  83 , and transmitted back to the radio transmitters/receivers  97 ,  98  each defined as the transmitting side. 
     FIG. 8 shows a procedure of creating a synthetic picture relative to a working condition in the unit installation site  86 . Upon a start of a step of creating the unit installation site synthetic picture (step  801 ), the TV camera  92  fitted to the crane  82  begins to image the unit installation site  86 , and the crane operator  84  recognizes the installation site worker  87  and adds follow-up identification marks (e.g., a name and an ID number) to the picture of the installation site worker  87  step  802 ). The site worker  87  is tracked based on the identification marks (step  803 ), and the name of the site worker is recognized in accordance with an image processing technology based on the mark put on the helmet  88  (step  804 ). The picture of the site worker  87  is projected in a position of the worker, then the site worker imaging picture and the installation unit picture are rearranged in their directions, and the site worker imaging picture is developed and displayed based on a predetermined plotting method with the installation unit  90  centered (step  805 ). The synthetic picture of the unit installation site  86  is thus completed (step  806 ). 
     FIG. 9 shows a procedure relative to a working condition of the unit installation site  86  by utilizing the self-position measuring device. When starting a step of creating a unit installation site synthetic picture (step  901 ), the TV camera  92  fitted to the crane  82  begins to image the unit installation site  86  (step  902 ), and a measured result of the self-position measuring device  122  carried by the site worker  87  is displayed in the unit installation site imaging picture with an addition of the name of the site worker  87  (step  903 ). Further, the imaging picture of the sit worker  87  is synthesized in alignment with the position of the worker (step  904 ). The crane operator  84  changes a direction of the picture imaged by the site worker  87 , and the site worker imaging picture is developed and displayed based on a predetermined plotting method with the installation unit  90  centered (step  905 ). The synthetic picture of the unit installation site  86  is thus completed (step  906 ). 
     FIG. 10 is an information transmission block diagram showing a cooperative work performed by transmitting the synthetic picture and the voice information obtained by the plant constructing method of implementing the cooperative work sharing the picture information on the site work, to the site remote control room  2  for remote-controlling the plant constructing site and to the control center  3 . The line-of-sight position information and the voice information of the managers  12 ,  15  of the site remote control room  2  and of the control center  3  are also added to the synthetic picture and the voice information of the unit installation site and then transmitted to their places. The information is transmitted between the site remote control room  2  and the control center  3  via a communication satellite  4 . The internal constructions of the work site  1 , the site remote control room  2  and the central control room  3  are the same as those described above. 
     The operation of the present invention will be discussed in greater details with reference to FIGS. 1 to  10  shown above. 
     Generally in the plant construction, physical distributions are concentrated toward the plant construction site from the peripheral areas, and the construction can be completed in the shortest term of works by gaining a more increased speed of the work as it gets closer to the center. For reducing the construction terms of the plant, it is feasible to reduce a working quantity in the central plant construction site by performing the assembly work up to a stage of the large-size unit in a factory with a favorable working environment, which involves the utilization of a variety of special machines at the peripheral working stages, and the working time can be decreased correspondingly. Besides, a working efficiency can be further enhanced by introducing a measure of supporting a capability of the worker. For example, it is a vital subject to enhance the efficiency of the cooperative work of the site workers with the movement and installation of the large-size unit by use of the crane in the plant construction site. 
     A minimum unit of the installation work in cooperation with the worker using the crane is based on a method by which one site worker performs the installation work while operating the crane in cooperation with another site worker. The largest unit next to the above is to structure a method of executing the installation with a dedicated operator who operates the crane and two or more site installation workers. According to the working method used so far, the work manager and the preparatory workers are added to the number of workers who do the actual works. According to the present invention, the dedicated work manager is eliminated, the worker serves as the site manager, and the preparatory workers are minimized, or alternatively the cooperative work is conducted by posting no preparatory workers, thereby enhancing the working efficiency as well as saving the labors. 
     The plant construction site is constructed of the work site  1  using the crane at the plurality of places, and of the site remote control room  2 , wherein the information is exchanged the work site  1  and the control room  2  via the permanent wires or wirelessly. Generally, the plant construction site is located geometrically far away from the control center  3 . The information exchange between the control center  3  and the plurality of plant construction sites is carried out using the communication satellite  4 , which may be defined as a more efficiency system in the case of dealing with a large quantity of picture information in areas where the infrastructure is not yet well prepared. 
     As one example of a large-size assembly unit, it is assumed that a work of installing the reactor pressure vessel  20  having a weight exceeding 800 tons in the pedestal  21  of the nuclear reactor building  17  by use of the crawler crane  19 , is implemented by the workers sharing the picture information. A TV camera  26  fitted to a lower portion of the reactor pressure vessel  20  images a spot of the reactor pressure vessel  20  being installed and also the site workers in the vicinity thereof, and the imaged pictures are wirelessly transmitted to the crane operation room  83 . A TV camera fitted to an upper edge of the crawler crane  19  images from above the reactor pressure vessel  20  suspended from the crane  19 . The video signal and the voice signal obtained by the site worker  87  and the video signal obtained by the TV camera  26  fitted to the lower portion of the reactor pressure vessel  20 , are respectively wirelessly transmitted toward the antenna  74  attached to the upper edge of the crawler crane  19  (FIG.  2 ). The video signal and the voice signal are transmitted via the wire to the image processor (not shown) installed in the operation room  28  of the crawler crane  19 . 
     The reactor pressure vessel  20  is projected on the monitor TV in the operation room  28  till the vessel  20  passes through a roof aperture  24  of the nuclear reactor building  17  and is lowered while being suspended down to a level position higher than a height of the worker upwardly of the upper edge of the pedestal  21 . Then, the operator executes an operation of lowering the reactor pressure vessel  20  while watching the pictures of the installation place and the installation unit which are imaged by the TV cameras  26 ,  27 . Further, meanwhile the operator puts a marks on the virtual workers in the pictures of the site workers as well as on the upper surface of the pressure vessel  20  imaged by the TV camera  27  so that the marks move following up motions of the workers. The operator zooms up the helmet of the worker with the mark and recognizes the name of the worker by reading the mark on the helmet. Based on this recognition, the operator changes the mark into the name of the worker so as to similarly move it following up the worker. The reactor pressure vessel  20 , i.e., the installation unit  90  is fitted with a self-position measuring device  121 . In the case of the worker  87  carrying a self-position measuring device  122  (FIG.  7 ), the name of the worker is labeled to the picture f the workers among the pictures of the site workers as well as to the upper surface of the installation unit imaged by the TV camera  27  by use of the self-position information transmitted, thus setting to follow up the picture of the worker. 
     When the reactor pressure vessel  20  descends down to the level position higher than the height of the site worker upwardly of the upper edge of the pedestal  21  (which is recognized by a sign of a hand of the site worker  87 , or judged from the picture imaged by the TV camera  105  of the site worker  87 , and further recognized based on a judgement using the self-position information of the self-position measuring device  121  attached to the installation unit  90 ), the picture of the TV camera  27  is synthesized with the picture imaged by the TV camera  105  fitted to the helmet  88  of the worker standing by along the periphery of the pedestal  21 . A synthesizing method is that the TV camera  27  attached to the upper edge of the crawler crane  19  images from above the rector pressure vessel  20  suspended is, with this picture centered, synthesized with the picture imaged by the TV camera  105  attached to the helmet  88  of the site worker standing by along the periphery of the pedestal  21 , and this synthetic picture is labeled with the name of the worker and then displayed. This synthetic picture moves following up a motion of the site worker  87 . Further, the picture of the reactor pressure vessel  20  is provided with a frame of inhibiting the synthesization so as not to overlap with the picture of the reactor pressure vessel  20 . 
     The operator of the crawler crane  19  cuts a picture in a fixed range on which the attention is paid out of the pictures imaged by the site workers, and pastes it to the picture imaged by the TV camera  27 . Further, there is performed an operation of pasting the picture while rotating this picture, which is cut out to synthesize the picture as in the way the three-dimensional body is developed based on the trigonometry and thus displayed. The picture range in which to execute the cutting process is set in a follow-up state in the picture imaged by the site worker. When the self-position measuring device  122  detects that the position of the site worker moves over the fixed range, a position in which to paste the cut-out picture is shifted to a new position of the picture of the site worker. The picture imaged by the site worker is changed over at a fixed interval, and this changeover of the picture is made so as to smoothly move an indication of the line-of-sight position. 
     The name of the worker who images the picture is indicated in the pasted picture. The picture imaged is pasted as the necessity arises. The line-of-sight position pf the site worker who images the picture is indicated in the pasted picture. The line-of-sight position of the operator of the crawler crane  19  is indicated in the picture of the central pedestal  21  or the pasted picture. The operator of the crawler crane  19  performs the operation of lowering and installing the reactor pressure vessel  20  while watching the picture synthesized with the picture imaged by the site worker, in which the picture obtained by imaging the reactor pressure vessel  20  is centered. The operator gives the site worker an indication to change the imaging place by using the line-of-sight position and the voice as well. The site worker projects the synthetic image on the portable monitor TV  113  fitted to the arm  112  opposite to the dominant arm, and receives an indication of the operator while watching this synthetic picture. The dominant arm is used for effecting a paste auxiliary work involving the use of an instrument. The picture imaged by the site worker is compared with design specification data, then a relative distance to the installation unit is calculated, and a numerical value thereof is indicated in the synthetic picture. The descent of the reactor pressure vessel  20  continues at an allowable maximum velocity with reference to the numerical value given above till the vessel  20  is lowered down to the floor. The synthetic picture of the installation work site is transmitted also to the site remote control room  2  and the control center  3 , and the line-of-sight position information on the manager  15  of the control center  3  as well as on the manager  12  of the site remote control room  2 , is also transmitted to the operation room  6  of the crawler crane  19 . The line-of-sight position information is additionally synthesized with the synthetic picture according to the necessity and respectively used for conveying the indications given from the managers  12 , 15 . 
     Considered next by way of an example different from the above-mentioned is a case in which for proceeding the works of constructing the building, installing the appliances and excavation in parallel, bases  72 ,  73  are constructed on the caisson  29 , the area under the caisson  29  is excavated while constructing the nuclear reactor building  17  and the turbine building  18  on the bases  72 ,  73 , and the caisson  29  is sunk in accordance with a progress of the excavation, under which method of work the cooperative work of the crane operator with the site workers sharing the picture information is conducted. Besides, what is considered is a case of adopting a system os executing the excavation and carrying out the surplus soil, in which the excavation of the area under the caisson  29  involves the use of the ceiling traveling type excavating device  30  and the crawler type excavating device (not shown), the surplus soil of the excavation is put into the surplus soil carry container  31  which is then lifted above a ground surface  77  by the ceiling cranes  32 ,  33  through the carry-in/carry-out devices  35 ,  36  secured to the caisson  29 , and the surplus soil is discharged to the surplus soil leaving place by its being loaded into the carrier device  34 . Considered also is a case of adopting a construction method by which the caisson  29  is sunk to expand a spacing between support columns  37  in accordance with a progress of the excavation, however, first-floor surfaces  75 ,  76  of the nuclear reactor building  17  and the turbine building  18  are set flush with the ground surface  77 . 
     When the surplus soil carry container  31  passes through the carry-in/carry-out devices  35 ,  36 , the site workers posted thereabout and wearing the helmets attached with the TV cameras and the line-of-sight detectors conduct slinging works of the ceiling cranes  32 ,  33 . When the surplus soil carry container  31  is mounted in the carrier device  34 , the operator, putting on the helmet equipped with the TV camera and the line-of-sight detector, of the carry device  34  performs the slinging works of the ceiling cranes  32 ,  33 . The operation room of the ceiling cranes  32 ,  33  is provided with the picture information processor for obtaining a synthetic picture by executing a process of synthesizing pictures imaged by the TV cameras  78 ,  79  fitted to the ceiling cranes  32 ,  33 , pictures imaged by the TV cameras  80 ,  81  fitted to the surplus soil carry container  31  and pictures imaged by the site workers and the operator of the carrier device  34  with pieces of the line-of-sight position information of the ceiling crane operator, the side workers and the carrier device operator. The synthetic picture obtained herein is transmitted to the monitor TV installed in the operation room of the ceiling cranes  32 ,  33  and to the portable monitor TVs of the site workers and the carrier device operator. The operator performs the carrying work of the surplus soil carry container  31  while watching the monitor TV in the operation room. The surplus soil carry container  31  and the carrier device  34  are fitted with self-position measuring devices  123 , and the site workers and the carrier device operator also carry self-position measuring devices  124 . Self-position information given from the self-position measuring devices  123 ,  124  is transmitted to the ceiling crane operation room and is used when creating the synthetic picture. Further, the self-positions are respectively displayed in the follow-up state in the drawings showing the design specifications, and there are made clear present positions of the appliances relative to the surplus soil carry-out work such as the carrier device, the surplus soil carry container and the ceiling crane. The ceiling crane operator gives a work indication to the persons concerned in accordance with the such positions. 
     According to the embodiment discussed above, in the work of assembling the large-size unit using the cranes by performing the cooperative work among the plurality of site workers, the appliance operators and the managers, the site workers are smoothly shifted to optimal places to the work object by using the various pieces of picture information and the voice information, thus conveying an intention of the operator. As a result, the crane can be operated while maximizing the operation speed of the crane, whereby an installation work time using the crane can be remarkably reduced. Accordingly, the construction term of this type of plant can be reduced. 
     Next, another embodiment will be described with reference to FIG.  11 . FIG. 11 is a block diagram showing an information transmission system in the case of fixing the large-size unit by executing a welding process in the cooperative work sharing the picture information between the site remote control room  2  in the plant construction site and a unit welding site  125 . The helmet  88  of the site worker posted in the unit welding site  125  is equipped with a TV camera  105 , a line-of-sight detector  106 , a microphone  107 , a headphone  108 , an image processor  109 , a voice processor  110  and a radio transmitter/receiver  111 . Further, an arm  112 , opposite to the dominant arm, of the site worker  87  is attached with a portable monitor TV  113 , and a waist part  127  thereof is fitted with a self-position measuring device  122 . A radio transmitter/receiver  97  of a transportable site information relay device  92  temporarily provided in the welding site, wirelessly transmits and receives the information to and from the radio transmitter/receiver  111  of the helmet  88 , and also transmits and receives the information to and from a radio transmitter/receiver  136  of a site information relay device  126  fixedly provided. Note that a torque measuring device  138  will be explained later on. 
     The operator  12  stationed in the site remote control room  2  provided in the plant construction site is fitted with a microphone  128 , a headphone  129 , a voice processor  130  and a radio transmitter/receiver  131 . The site remote control room  2  is equipped with an console  13 , a large-size multi-screen  11 , a radio transmitter/receiver  132  and a computer  68 . The console  13  includes a TV camera  133 , a line-of-sight detector  134  and an image processor  135 . Note that the two radio transmitters/receivers  131 ,  132  mutually wirelessly transmit and receive the information within the site remote control room  2 . The computer  68  controls a general data processing function in a control room  12  within the site remote control room  2 , and functions as an I/O interface with external appliances. The computer  68  is connected via a cable to the site information relay device  126  disposed in the work site. 
     In a work of joining the unit in, e.g., a nuclear power plant to an existing structure by welding, a cooperative work of the crane operator with the sit workers is required for moving and aligning the unit by using the crane. Further, after finishing the alignment, a plurality of welding workers perform a fixing work in parallel. When the plurality of workers perform the welding work in parallel, the spots to be simultaneously welded are located evenly along the periphery of the object so that a thermal distortion due to the welding might uniformly occur along the periphery of the fixed object. It is also required that the welding portions be monitored for ensuring a quality of the welding. 
     In the work of fixing the unit installed by using the large-size crawler crane to an existing structure, the site worker  87  wears the helmet  88  equipped with the TV camera  105 , the line-of-sight detector  106 , the microphone  107  and the headphone  108 , and a self-position measuring device  122  is fitted to a waist part  127  thereof. An arm  112  opposite to the dominant arm is fitted with a portable monitor TV  113 , and the dominant arm holds an unillustrated welding device, thus performing the welding work. The picture information, the voice information and the self-position information of the worker  87  are transmitted to the computer  68  in the site remote control room  2  via a transportable site information relay device  126  from the radio transmitter/receiver  111 . The computer  68  analyzes the picture information of the welding portion, thus managing a quality of the welding work. Further, a position of the sit worker  87  is obtained from the self-position information of the worker  87 , the imaging information of the TV camera  105  and CAD data, and an indication of this position is added onto the CAD data. A picture obtained by synthesizing it with the welding portion picture imaged by the site worker  87 , is projected on the multi-screen  11 , whereby the manager  12  in the site remote control room  2  manages a condition of the welding work. The computer  68  is stored with, as a data base, a result of analysis about the welded condition and portions in which the welding work has been finished. Created then on the CAD data is a picture to which the indication of the welding-finished portions and an indication of portions on which the welding process is next executed are added. This picture is projected on the multi-screen  11 . As for the projection thereof, the picture in a wide range is spatially divided, and the divided fragmental pictures are simultaneously projected in a plurality of large-size multi-screens, or alternatively the spatially-divided pictures are projected while being changed over in time-sequence on one or the plurality of screens. 
     Transmitted to the unit welding site  125  are voice indication information and a synthetic picture obtained by additionally synthesizing the synthetic picture showing the portions to be welded next with line-of-sight picture information of the manager  12  of the site remote control room  2 . The site worker  87  performs the welding work in accordance with a voice indication through the headphone  108  and a picture on the monitor TV  113 . 
     The picture obtained by adding the picture synthesized with the welding portion picture imaged by the site worker  87 , the indication of the welding-finished portions on the CAD data and the indication of the portion to be welded next to the CAD data showing the position of the site worker  87 , is transmitted from the computer  68  in the site remote control room  2  to a computer  71  in the central control room  3  via the communication satellite  4  (see FIG.  10 ). At this time, the line-of-sight information and the voice information of the site worker  87  and of the manager  12  in the site remote control room  2 , are simultaneously transmitted thereto. 
     The information of the line-of-sight information of the manager  15  in the control center  3 , is additionally synthesized with the synthetic picture with the CAD data centered. This synthetic picture is transmitted to the multi-screens  11 ,  14  in the site remote control room  2  and the control center  3  as well as to the monitor TV  113  of the site worker  87 , thus promptly thoroughly notifying the site worker  87  and the manager  12  in the plant construction site of an indication of the manager  15  in the control center  3 . Further, the synthetic picture with the CAD data centered or a corresponding state of the site remote control room  2  is projected on the multi-screen  14  in the control center  3 , and the working condition is monitored, thereby making a comparison with a welding process of the design database. In this way, the necessary materials are arranged, and a welding procedure or an operation procedure is evaluated, and the design division is indicated to review the design corresponding to the actual condition and the arrangement of the materials, thus making the review followed by a change in the design of the whole plant. 
     As discussed above, each of the plurality of welding workers individually wears the helmet equipped with the TV camera, and transmits the picture of the welding portion to the remote control room in the plant construction site, and the quality management of the welding portion is individually conducted online using the picture information, hereby the high-quality welding works can be carried out in parallel. Moreover, the control center in the remote area is capable of recognizing the welding-finished portions on the CAD data, and gives an indication of the portion to be welded next to each individual worker. Then, an efficiency of the whole works is increased by performing the welding works in cooperation, which makes a contribution to a reduction in the construction processes. 
     An embodiment which will be discussed next is concerned with a working method when fastening a bolt by use of a dedicated fastening tool instead of the welding for fixing the unit in the device shown in FIG. 11. A torque measuring device  138  is provided for measuring a fastening torque when fastening the bolt, information on the fastening torque of the dedicated fastening tool is transmitted via a radio transmitter  137  to a radio transmitter/receiver  97  of a transportable site information relay device  92 , and further transmitted therefrom to the computer  68  in the site remote control room  2  via a fixedly-provided site information relay device  126 . In accordance with this embodiment, the fastening work is conducted by using the dedicated fastening tool as a substitute for the welding work performed by the plurality of site workers using the welding machine. In this case, a fastening torque of the bolt is measured by the torque measuring device  138 , and the quality management is done through a management of the fastening torque. 
     The wire worker  87  wearing the helmet  88  equipped with the TV camera  105  transmits the picture of the site of the fastening work using the dedicated fastening tool and the torque measured value to the site remote control room  2  in the plant construction site, whereby the quality management of the fastening work is conducted online. The high-quality fastening work can be thereby implemented in parallel, which contributes to reduce the construction processes by enhancing the working efficiency of the whole plant. 
     Further, still another embodiment will be explained. Referring to FIG. 2, the bases  72 ,  73  are constructed on the caisson  29 , the area under the caisson  29  is excavated while constructing the nuclear reactor building  17  and the turbine building  18  on the bases  72 ,  73 , and the caisson  29  is sunk in accordance with a progress of the excavation and further sunk by expanding a spacing between the support columns  37 . The expansion of the spacing between the support columns  37  involves the use of a spacing adjusting tool (not shown) for adjusting the spacing to a predetermined value. In such a case, the actual spacing is judged, based on an indicated torque of the spacing adjusting tool, to be excessive or deficient with respect to the predetermined value of spacing. 
     When the caisson  29  is sunk, the site worker  87  wearing the helmet  88  equipped with the TV camera  105  and the line-of-sight detector  106  and carrying the self-position measuring device  122 , stands by per support column  37  for expanding the spacing. Transmitted to the computer  68  in the site remote control room  2  are a picture of the spacing adjusted portion between the support columns  37  which is imaged by the site worker  87 , the line-of-sight position information and self-position information of the site worker  87 , a torque quantity of the spacing adjusting tool and a spacing measured quantity. These pieces of information are synthesized with the CAD data, thereby creating a synthetic picture. This synthetic picture is transmitted and projected on the multi-screen  11  in the site remote control room  2  and on the monitor TV  113  of the worker  87  himself or herself. 
     The manager  12  in the site remote control room  2  adds the voice, the line-of-sight position/numerical value to the synthetic picture, and gives an operational instruction to expand the spacing between the support columns  37  through the indication on the monitor TV  113  fitted to the arm  112  opposite to the dominant arm  112  as well as through the head phone  108  of the site worker  87 . The site worker  87  implements the operation of adjusting the spacing between the support columns  37  by manipulating the spacing adjusting tool while watching the monitor TV  113 . The operator of the ceiling crane indicates the object position with which the operator has a concern by moving the line-of-sight position display on the synthetic picture and simultaneously gives a voice indication, whereby the site worker is moved to a place optimal to the surplus soil container  31  to image a desired picture. The intention of the operator is thus immediately conveyed. In this way, the ceiling crane can be operated by maximizing the operation velocity of the ceiling crane, and a reloading time of the surplus soil container  31  can be thereby reduced using the ceiling crane.