Heating furnace for testing middle and long span structures

A heating furnace for testing middle and long span structures including a modular partition structure to adjust an inner volume of the heating furnace, effectively performing a load-coupled heating test of full scale members such as a beam, a short column, a slab, a conjunction frame, and a deck plate. The heating furnace for testing middle and long span structures includes a partition unit formed of a refractory material and partitioning a heating space in a main body to block transfer of heat generated from one space to the other space. A test sample is installed in the heating space of the main body partitioned by the partition unit according to a size of the test sample, and then, heat and a compression force are applied to the test sample to perform a fireproof performance test. The fireproof performance test of structure members having various lengths of 4 m, 6 m and 10 m can be performed, and consumption of various utilities consumed during the test can be optimized. In addition, since the heating furnace can perform an actual material test of full scale structures such as continuous span beams and long span beams, deck plates, or bridge trusses of civil structures, deck plates for ships, and so on, target fireproof performance estimation of various shape conditions can be performed to increase applicability of the test.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the priority benefits of Korea patent application serial no. 10-2009-0108279, filed on Nov. 10, 2009. The entirety of the above-mentioned patent applications is hereby incorporated by reference herein and made a part of specification.

BACKGROUND

The present invention relates to a heating furnace for heating middle and long span structures of a construction structure to perform a structure test and a fireproof performance test, and more particularly, to a heating furnace for testing middle and long span structures including a modular partition structure for adjusting an inner volume according to sizes of middle and long span members used in a high-rise and large-space building to check a full scale fireproof performance and extract a scale factor of the middle and long span members and enabling an effective load-coupled heating test of the middle and long span members such as a beam, a short column, a slab, a conjunction frame, a deck plate, a deck plate for a ship, and so on.

2. Description of the Related Art

In recent times, due to development of industries, concentration of population and urbanization, buildings are undergoing Manhattanization and becoming larger and larger. Thus, if a building is on fire, the fire may easily become out of control and cause serious material damage and casualties.

When the building is on fire, a structural member is exposed to a large amount of heat and is structurally weakened, making it unable to maintain its structural strength. Accordingly, when the building is on fire, the strength of the structure is decreased, causing the building to easily collapse, which frequently results in serious casualties and property damage.

Since use performance limits or structural destruction of the structural member affected by the large amount of heat upon fire of the construction structure are determined according to support conditions, load states and fire-exposed surfaces as well as physical and thermal characteristics of a material constituting the building structure, it is important to perform fireproof design of the structure in consideration of this.

In the conventional art related thereto, tests of applying heat to a short structural member and measuring strength thereof have been frequently performed. For example, Korean Patent Laid-open Publication No. 10-2008-011450, entitled “EQUIPMENT FOR TESTING SPALLING FAILURE OF CONCRETE UNDER CONDITION OF APPLYING LOAD,” discloses an apparatus for performing a concrete explosive spalling test under a load applying condition.

As shown inFIG. 1, a conventional concrete explosive spalling test apparatus1under a load applying condition includes a heating furnace body30having one surface on which a sample10is disposed, a heating assembly50for supplying flame to the heating furnace body30, a load applying assembly60for forming a load applying condition to the sample10, and a controller70for controlling the heating assembly50according to pre-input fire conditions. Since the conventional concrete explosive spalling test apparatus1under a load applying condition can perform fire tests of samples in a load applying condition, explosive spalling tests according to various fire conditions may be performed. In addition, since the heating assembly is controlled on the basis of temperature data measured by a plurality of temperature sensors, the tests can be accurately performed.

However, the conventional test apparatus can only perform a load-coupled heating test of samples such as a simple concrete block having a short length, but cannot perform fireproof performance tests of various full scale members such as middle and long span members used in a high-rise and large-space building, for example, middle and long span beams having lengths of 4 m, 6 m and 10 m, short columns, slabs, conjunction frames, deck plates, deck plates for a ship, and so on.

SUMMARY

In order to solve the problems, the present invention is directed to a heating furnace for testing middle and long span structures capable of easily performing a fireproof performance test of various full scale members such as middle and long span members used in a high-rise and large-space building, for example, middle and long span beams having lengths of 4 m, 6 m and 10 m, short columns, slabs, conjunction frames, deck plates, deck plates for a ship, and so on.

In addition, the present invention is also directed to a heating furnace for testing middle and long span structures having a modular structure that can easily adjust an inner volume of the heating furnace according to sizes of middle and long span structures during a load-coupled heating test, optimizing consumption of various utilities required for the test and performing various fireproof performance tests.

According to an exemplary aspect, there is provided a heating furnace for testing middle and long span structures, which includes: a main body having an inner wall formed of a refractory material and an outer wall formed of a steel material, a detachable cover installed on an open upper part thereof, and a heating space formed therein; a heating unit including a burner for providing heat from both sidewalls of the main body to heat the heating space; an exhaust unit having a plurality of exhaust ports for discharging an exhaust gas in the heating space from both sidewalls in a widthwise direction of the main body, and exhaust pipes connected to the exhaust ports to discharge the exhaust gas to a chimney, respectively; a partition unit for partitioning the heating space of the main body and formed of a refractory material to block transfer of heat generated from one space to the other space; a horizontal force applying unit including a horizontal actuator for applying a compression force to one side of a test sample installed in a longitudinal direction of the main body, and a reaction frame for supporting the other side of the test sample at an opposite side of the horizontal actuator; and a vertical force applying unit including a vertical actuator for applying a compression force to the test sample from an upper part of the test sample installed in the main body, and a support frame for supporting the test sample on the main body, wherein the heating space of the main body is partitioned using the partition unit to correspond to a size of the test sample, and heat and a compression force are applied to the test sample in the heating space to perform a fireproof performance test.

Therefore, the fireproof performance test can be easily performed with respect to the middle and long span members used in a high-rise and large-space building, and an inner volume of the heating furnace can be easily adjusted, optimizing consumption of various utilities required for the test and variously performing the fireproof performance test.

In addition, a test sample mounting space is formed at the both sidewalls in the widthwise direction of the main body and an upper center of the partition unit, and a blocking wall formed of a refractory material is disposed in the test sample mounting space to open the test sample mounting space according to the size of the test sample, performing the fireproof performance test. The test sample having various sizes to a height of 800 mm can be mounted in the heating space to perform the fireproof performance test through the test sample mounting space and the blocking wall.

Further, the support frame of the vertical force applying unit may include a movable beam support installed on the bottom to support both ends of a linear test sample installed in the heating furnace, and a plate support mounted on an upper center of the main body, in which the cover is opened, to support a plate-shaped test sample. Therefore, it is possible to perform the fireproof performance test of a full scale test of middle and long span beams, a short column, a slab, a conjunction frame, a deck plate, a deck plate for a ship, and so on.

Furthermore, the partition unit may be removed from the interior of the heating space of the main body, the test sample may be mounted to cross the heating space, the heating unit may operate the burner throughout the heating space, and the exhaust unit may exhaust an exhaust gas through a plurality of exhaust ports so that the test sample is heated and compressed to perform a fireproof performance test. Therefore, it is possible to easily perform the fireproof performance test of the long span test sample having a length of 10 m.

In addition, a test sample may be mounted in a first space of the main body partitioned by the partition unit, the heating unit may operate the burner disposed in the first space, and the exhaust unit may exhaust an exhaust gas through the exhaust ports disposed in the first space so that the test sample is heated and compressed to perform a fireproof performance test. Therefore, it is possible to easily perform the fireproof performance test of the middle and long span test samples having lengths of 4 m and 6 m, without excessive consumption of utilities.

Further, a test sample may be mounted in a second space of the main body partitioned by the partition unit, the heating unit may operate the burner disposed in the second space, and the exhaust unit may exhaust an exhaust gas through the exhaust ports disposed in the second space so that the test sample is heated and compressed to perform a fireproof performance test. Therefore, it is possible to easily perform the fireproof performance test of the middle and long span test samples having lengths of 4 m and 6 m, without excessive consumption of utilities.

Furthermore, a plurality of test samples may be mounted in a first space and a second space of the main body partitioned by the partition unit, the heating unit may operate the burner disposed in the first and second spaces, and the exhaust unit may exhaust an exhaust gas through one exhaust port disposed in the first space and the other exhaust port disposed in the second space so that the plurality of test samples are heated and compressed to perform a fireproof performance test. Therefore, it is possible to more effectively perform the fireproof performance test of the plurality of middle and long span test samples.

In addition, the first space may have a heating space of a length of 4 m so that a linear test sample or a plate-shaped test sample having a length of 4 m can be tested, and the second space may have a heating space of a length of 6 m so that a linear test sample or a plate-shaped test sample having a length of 6 m can be tested. As described above, it is possible to easily perform the fireproof performance test of the middle and long span test samples having various sizes and shapes.

Further, the horizontal actuator and the reaction frame of the horizontal force applying unit may be assembled along a plurality of threaded holes formed at the bottom by bolts to be laterally position-adjusted with respect to the heating space of the main body, and the horizontal actuator may be vertically height-adjusted on an upright frame. Therefore, it is possible to easily apply a horizontal compression force and perform the fireproof performance test of the middle and long span test samples having various sizes and shapes.

Furthermore, the vertical force applying unit may be is movable on rails disposed at both sides of the bottom of the main body so that the vertical actuator is movable in the longitudinal direction of the main body. Therefore, it is possible to easily apply a horizontal compression force and perform the fireproof performance test of the middle and long span test samples having various lengths and sizes.

DETAILED DESCRIPTION

As fully shown inFIG. 2, a heating furnace100for testing middle and long span structures in accordance with the present invention includes a main body110constituted by an inner wall112formed of a refractory material and an outer wall114formed of a steel material. The main body110includes a detachable cover120to open an upper part thereof, and a heating space120provided therein.

The cover120covered on the main body110is formed of a steel structure having a refractory material applied on one surface thereof, which may be provided in plural. In addition, a heating means140is disposed in the main body110to provide heat from both sidewalls w1in a longitudinal direction thereof to heat the heating space130.

The heating means140includes a plurality of burners142in which LPG or LNG is used as fuel. The burners142are installed opposite each other at middle positions of both sidewalls w1in a longitudinal direction of the main body110.

A gas pipe144for supplying LPG or LNG to the burners142of the heating means140and an air supply pipe146for supplying combustion air are installed at outer surfaces of the both sidewalls w1in the longitudinal direction of the main body110.

In addition, an exhaust means160for discharging a combustion gas generated from the burners142of the heating means140, i.e., an exhaust gas, to the exterior is provided. The exhaust means160includes a plurality of exhaust ports162for discharging an exhaust gas in the heating space130from lower parts of both sidewalls w2in a widthwise direction of the main body110to the exterior. The respective exhaust ports162are connected to exhaust pipes166to be discharged to a chimney (not shown).

That is, the exhaust means160partially discharges the exhaust gas through a lower part of the main body110by partitioning the heating space130of the main body110from the lower part of the both sidewalls w2in the widthwise direction of the main body110using the respective exhaust ports162, rather than simply discharging the exhaust gas generated in the main body110of the heating furnace100to the exterior. The exhaust means160includes blowers168respectively installed at the exhaust pipes166, and the plurality of discharge ports162may be separately operated.

In addition, a plurality of sight glasses170are installed at the both sidewalls w2in the widthwise direction of the main body110so that a combustion state in the heating space130of the main body110can be observed with the naked eye.

Further, the heating furnace100for testing middle and long span structures in accordance with the present invention includes a partition means200for partitioning the heating space130of the main body110into first and second spaces132and134.

The partition means200functions to prevent heat generated from one space from being transferred to the other space using a refractory material. The partition means200may be extracted from the heating space130of the main body110. The partition means200has a modular structure in which the heating space130of the main body110is partitioned into a first space132having a length of 4 m and a second space134having a length of 6 m.

Therefore, the main body110is partitioned into a plurality of spaces by the partition means200, and a test sample mounting space202is formed at center parts of upper parts of the both sidewalls w2in the widthwise direction of the main body110and the partition means200. A blocking wall210formed of a refractory material is positioned at the test sample mounting space202to open the test sample mounting space202according to a size of a test sample.

That is, the blocking wall210has a detachable assembly structure to open the test sample mounting space202according to the size of the test sample disposed in the test sample mounting space202. When the space202is completely opened, the test sample having a height of 800 mm or less can be disposed in the test sample mounting space202to enter the heating space130, performing the fireproof performance test.

In addition, the heating furnace100in accordance with the present invention includes a horizontal force applying means220disposed at an outer side of the main body110. As shown inFIGS. 3A and 3B, the horizontal force applying means220includes a horizontal actuator222for applying a compression force to one side of the test sample installed in the longitudinal direction of the main body110, and a reaction frame disposed at an opposite side of the horizontal actuator222and supporting the other side of the test sample.

Further, as shown inFIGS. 4A and 4B, the horizontal force applying means220has a structure in which the horizontal actuator222and the reaction frame232are assembled along a plurality of threaded holes224formed in the bottom by bolts226, enabling position adjustment of the horizontal force applying means220with respect to the heating space130of the main body110. That is, when the horizontal actuator222and the reaction frame232are moved along the plurality of threaded holes224and then assembled by the bolts226, the position thereof can be adjusted to be near or far from the main body110of the heating furnace100according to the length and size of the test sample.

Here, the horizontal actuator222is configured to be vertically height-adjusted on an upright frame228. When the horizontal actuator222is fixed on the upright frame228formed of a steel structure by bolts228a, a horizontal compression force can be easily applied to the middle and long span test samples having various sizes and shapes to perform a fireproof test.

In addition, the heating furnace100for testing middle and long span structures in accordance with the present invention includes a vertical force applying means250for applying a compression force to a test sample from an upper part of the test sample installed at the main body110.

As shown inFIGS. 3A and 3B, the vertical force applying means250includes a vertical actuator270vertically installed on a gantry-type crane260, and a support frame280for supporting a test sample on the main body110as shown inFIG. 2.

In the vertical force applying means250, the gantry-type crane260can move along rails262disposed on both bottoms of the main body110to move the vertical actuator270in a longitudinal direction of the main body110.

The vertical force applying means250functions to apply a vertical compression force to a full scale member such as middle and long span beams, short columns, slabs, conjunction frames, deck plates, deck plates for a ship, and so on. As shown inFIG. 6, various clamps272may be mounted on the vertical actuator270to variously apply a vertical compression force to the test sample.

The test sample that can pass through the fireproof performance test of the present invention includes a linear test sample Sa such as a beam, a column, or a frame, and a plate-type test sample Sb such as a slab, a deck plate, or a deck plate for a ship.

Meanwhile, as shown inFIGS. 2,6A and6B, the support frame280provided in the vertical force applying means250includes a movable beam support282for supporting both ends of the linear test sample Sa installed in the heating furnace100, and a plate support284mounted on an upper center part of the main body100in which the cover120is opened, to support the plate-type test sample Sb.

As described above, the vertical force applying means250can use the vertical actuator270and the support frame280to variously test the linear test sample Sa having a column shape such as middle and long span beams, a short column and a conjunction frame, and the plate-type test sample Sb such as a slab, a deck plate, or a deck plate for a ship.

Hereinafter, a method of performing a fireproof performance test of various test samples using a heating furnace100for testing middle and long span structures in accordance with the present invention will be exemplarily described.

The heating furnace100for testing middle and long span structures in accordance with the present invention can partition the heating space130of the main body110using the modular partition means200according to the size of the test sample, install the test sample in the corresponding heating space130, and apply heat and compression force to the heating space130, effectively performing the fireproof performance test.

For example, as shown inFIG. 5A, a fireproof performance test of a long span linear test sample having a length of 10 m can be easily performed.

In the fireproof performance test, the partition means200is removed from the interior of the heating space130of the main body110, the test sample is mounted to cross the heating space130to be disposed between the horizontal actuator222and the reaction frame232, and then, the cover120is covered on the main body110.

At this time, as shown in the cross-sectional view ofFIG. 6B, the linear test sample Sa is disposed in the test sample mounting space202formed at both sidewalls w2in the widthwise direction of the main body110. Here, an opening size of the blocking wall210is varied depending on the height of the test sample.

In addition, the burners142of the heating means140are operated through the entire heating space130of the main body110, and the exhaust means160exhausts an exhaust gas through the plurality of exhaust ports162to rapidly heat the test sample for a short time through a desired temperature pattern, for example, KS or ISO Fire Test, IMO Ship Test method, or Tunnel Fire Test Method (RWS/RABT/MHC FIRE). After reaching a desired temperature, the horizontal actuator222is operated to compress the test sample, performing the fireproof performance test. Accordingly, it is possible to easily perform the fireproof performance test of the long span linear test sample Sa having a length of 10 m.

Further, unlike the above, for example, as shown inFIG. 5B, a fireproof performance test of a middle and long span linear test sample Sa having a length of 4 m can be easily performed. In the above fireproof performance test, the linear test sample Sa is installed in the first space132of the main body110partitioned by the partition means200and disposed between the horizontal actuator222and the reaction frame232, and the cover120is covered on the first space132of the main body110. At this time, an auxiliary compression frame200is installed at the second space134, in which no test sample is disposed, to extend to the reaction frame232so that the test sample can be compressed between the horizontal actuator222and the reaction frame232.

Furthermore, the burners142of the heating means140are operated to only the first space132of the main body110, and the exhaust means160exhausts an exhaust gas through the exhaust ports162disposed at the first space132to simultaneously compress the test sample, performing the load-coupled heating fireproof test. In addition, when the test sample S arrives at the desired temperature according to the set temperature pattern, the test sample S is compressed to perform the fireproof performance test. In this case, since the burners142disposed at the second space134of the main body110are not operated and the exhaust ports162are not operated either, the fireproof performance test can be easily performed without excessive consumption of utilities.

Similarly, as shown inFIG. 5C, the linear test sample Sa is mounted in the second space134of the main body110partitioned by the partition means200, and the fireproof performance test of the middle and long span structure having a length of 6 m can be performed through the same method as described above without excessive consumption of utilities.

In addition, as shown inFIG. 5D, a plurality of linear test samples Sa are mounted in the first space132and the second space134partitioned by the partition means200to be tested. In this case, when the test sample having a length of 4 m is installed in the first space132and the test sample having a length of 4 m is installed in the second space134, a space of 2 m remains in the center part. When the test is performed in a state partitioned into both parts, a horizontal load test is not performed, and a vertical load or heating test is mainly performed.

Of course, in a specific case in which the horizontal load test is needed, a horizontal extension clamp300may be installed at the center part of 2 m.

In this case, the heating means140operates all the burners142disposed in the first space132and the second space134to simultaneously heat the plurality of test samples, and the exhaust means160exhausts an exhaust gas through one exhaust port162disposed in the first space132and the other exhaust port162disposed in the second space134.

In addition, the horizontal actuator222is operated with respect to the test samples to check stability of the test samples for a predetermined time before the heating test, and then, the test samples are simultaneously compressed to a desired temperature and time according to a set temperature and time pattern to perform the load-coupled heating fireproof performance test. In addition, when the test sample arrives at a desired temperature according to the set temperature pattern, the horizontal actuator222is operated to simultaneously compress the plurality of linear test samples Sa, performing the load-coupled heating fireproof performance test. Therefore, fireproof performance tests of the plurality of middle and long span test samples can be effectively and simultaneously performed.

Meanwhile, the heating furnace100for testing middle and long span structures in accordance with the present invention can easily apply a vertical compression force to the middle and long span linear test samples Sa having various lengths to perform the fireproof performance test.

For example, as shown inFIGS. 6A and 6B, the vertical compression force can be easily applied to the middle and long span linear test samples Sa having various sizes to perform the fireproof performance test. In this case, for example, the plurality of linear test sample Sa can be mounted and tested in the first space132and the second space134partitioned by the partition means200.

At this time, as shown in the cross-sectional view ofFIG. 6B, the test sample is disposed in the test sample mounting space202formed on the both sidewalls w2in the widthwise direction of the main body110and the partition means200. Here, an opening size of the blocking wall210is varied depending on the height of the test sample.

In addition, as shown inFIG. 2, beam supports282are installed at both ends of the test sample. The beam supports282are installed at the bottom of the heating furnace to support both ends of the linear test samples disposed in the first space132and the second space134of the main body110.

In this case, the cover120is covered on the first space132and the second space134of the main body110, the linear test sample Sa is disposed just under the cover120to expose an upper surface thereof to the exterior, and both corners of the upper surface are in close contact with lower end corners of the cover120, so that three lower surfaces of the linear test sample Sa are exposed to the first space132and the second space134.

In this state, the heating means140operates all the burners disposed in the first space132and the second space134to simultaneously heat the plurality of test samples, and the exhaust means160exhausts an exhaust gas through the one exhaust port162disposed in the first space132and the other exhaust port162disposed in the second space134.

Through the above disposition, the three surfaces of the test sample are heated, and heat is remained in the first space132and the second space134by the cover120, rather than being discharged to the exterior. In addition, the horizontal actuator270is operated with respect to the test sample before the heating test to check stability, etc., of the test sample for a certain time, and then simultaneously compresses the test samples to a desired temperature and time according to a set temperature and time pattern, performing a load-coupled heating fireproof performance test. Further, when the test sample arrives at the desired temperature according to the set temperature pattern, the vertical actuator270is operated to lower the clamps272and simultaneously compresses the plurality of linear test samples Sa, performing the load-coupled heating fireproof performance test. Therefore, the vertical compression force can be simultaneously applied to the plurality of middle and long span test samples Sa to perform the fireproof performance test.

In addition, the heating furnace100for testing middle and long span structures in accordance with the present invention can easily apply the vertical compression force to the middle and long span structures having various sizes to perform the fireproof performance test using the vertical force applying means250.

For example, as shown inFIGS. 7A and 7B, a vertical compression force can be easily applied to plate-shaped middle and long span test samples having various sizes to perform the fireproof performance test. Specifically, a plurality of plate-shaped test samples Sb can be mounted in the first space132and the second space134partitioned by the partition means200and tested therein.

In this case, as shown inFIG. 2, the plate supports284are installed at the plate-shaped test samples Sb, respectively. The plate supports284are installed at upper ends of the first space132and the second space134of the main body110in a state in which the cover120of the heating furnace100is removed, and the plate-shaped test sample Sb is installed at the upper part of the plate support284to be supported thereby, instead of the cover120.

In this case, the lower surface of the plate-shaped test sample Sb is exposed to the first space132and the second space134. In this state, the heating means140operates all the burners142disposed in the first space132and the second space134to simultaneously heat the plurality of test samples, and the exhaust means160exhausts an exhaust gas through the one exhaust port162disposed in the first space132and the other exhaust port162disposed in the second space134.

Therefore, the plate-shaped test sample Sb is heated through the above disposition structure, and the heat is remained in the first space132and the second space134, not discharged to the exterior by the plate-shaped test sample Sb.

In addition, the horizontal actuator270is operated with respect to the test samples to check stability, etc., of the test samples for a certain time before the heating test, and then, the test samples are simultaneously compressed to perform the load-coupled heating fireproof performance test to a desired temperature and time according to a set temperature and time pattern. Further, when the plate-shaped test sample Sb arrives at the desired temperature according to the set temperature pattern, the vertical actuator270is operated to lower the clamps272for the plate-shaped test samples and simultaneously compress upper surfaces of the plurality of test samples, performing the load-coupled heating fireproof performance test. At this time, the clamps272for the plate-shaped test samples can apply an equally distributed vertical load to the plate-shaped test samples Sb, more precisely performing the load-coupled heating fireproof performance test.

As described above, the vertical compression force may be simultaneously applied to the plurality of plate-shaped middle and long span test samples Sb to perform the fireproof performance test.

In addition, during the test, the size of the plate-shaped test sample Sb may be smaller than the first space132or the second space134of the main body110. In this case, the cover120is covered on the first space132or the second space130, which is not covered by the plate-shaped test sample Sb, to keep heat in the first space132and the second space134.

Since the present invention may include the modular partition means200, which is detachably attached to the interior of the main body, to adjust an inner volume of the heating furnace100, the fireproof performance test of the structural member having various lengths such as 4 m, 6 m and 10 m can be readily performed. In particular, during the test, since the inner volume of the main body110is adjusted to perform the load-coupled heating test, it is possible to optimize consumption of various utilities required for the test.

Further, since the present invention can perform an actual material test of full scale structures such as continuous span beams and long span beams, deck plates, or bridge trusses of civil structures, deck plates for ships, and so on, having various shapes and sizes, target fireproof performance estimation of various shape conditions, which was impossible, can be performed to increase applicability of the test, precisely performing the desired fireproof performance test.

As apparent from the above description, since the heating furnace for testing middle and long span structures in accordance with the present invention has a modular structure in which the inner volume of the heating furnace can be adjusted, the fireproof performance test of the structural members having various lengths of 4 m, 6 m and 10 m can be performed. In particular, during the test, since the inner volume of the heating furnace is adjusted to perform the load-coupled heating test, it is possible to optimize consumption of various utilities required for the test.

In addition, in the case of the building, the heating furnace for testing middle and long span structures in accordance with the present invention can perform an actual material test of full scale structures such as continuous span beams and long span beams, deck plates, or bridge trusses of civil structures, deck plates for ships, and so on, having various shapes and sizes, target fireproof performance estimation of various shape conditions, which was impossible, can be performed to increase applicability of the test, precisely performing the desired fireproof performance test.