PREFABRICATED AND DISMOUNTABLE WEIGHBRIDGE

Abstract: Fabricated and dismountable weighbridge for weighing vehicles and which, including the foundation can be taken up, transported and rebuilt somewhere else. According to the invention: A number of short prefabricated concrete foundation elements (1,2) each arranged on its workfloor (F) at regular intervals; a supporting construction (3,4,5,6) is arranged on these short prefabricated concrete elements (1,2); a bridge platform assembled from at least partially prefabricated concrete elements (7,8) is arranged on supporting construction (2,3,4,5). According to a preferred embodiment of the invention: the steel supporting construction (2,3,4,5) is a framework comprising two main steel longitudinal beams (3,4) arranged on each side of the prefabricated concrete foundation elements (1,2); a number of steel crossbeams (5) fixed between the main longitudinal steel beams (3,4) at regular intervals (s). In a favoured embodiment of the invention : the short prefabricated concrete foundation elemenents (1,2) have longitudinal cross-section of 'U' form; the main steel longitudinal beams (3,4) have a cross-section of 'I' form; the steel crossbeams (5) have a cross-section of 'I' form which is smaller than that of the cross section of 'I' form of the main steel longitudinal beams (3,4) and in which the extended concrete tracks (7,8) have a width smaller than that of the weighbridge and which have steel gratings (9) lying therebetween.

Description: The invention relates to a prefabricated and dismountable weighbridge for weighing vehicles comprising a platform assembled from at least partially prefabricated concrete elements and ramps arranged on a workfloor. A weighbridge of this type in known from Patent Specification FR-A-2.575.335. In this specification the bridge is made entirely of concrete elements joined by pin-and-hole couplings which are locked in position with the aid of prestressed lateral bars. The object of the invention is to provide a weighbridge of the type defined in the preamble which is easy to assemble and to disassemble so that it can be reassembled at another location, which is sufficiently stable to enable calibrating measurement results to be obtained, and which leaves only a small residue after disassembly so that it is minimally hazardous for the environment. According to the invention, this object is achieved by a number of short prefabricated concrete foundation elements which are arranged at regular intervals on a foundation layer, on which foundation layer a steel supporting construction is arranged and in which construction the elements are arranged and whereby weighing means are accommodated between the underside of the construction and the upper side of the foundation elements. By the application of the invention it is possible to prefabricate all of the parts through which the accuracy thereof is improved and the assembly time on site is reduced. In addition hereto, a more stable bridge-platform is obtained by the combination of a steel supporting construction and a concrete upper layer of elements more lighter in weight and which will permit calibrating measurements to be obtained. Furthermore, the bridge construction as a whole can be easily taken away after use without damage to the environment. Finally the foundation can also comprise prefabricated elements which can be quickly removed after use and used in some other place. According to a preferred embodiment of the invention, the steel supporting construction can be a framework assembled from two main longitudinal steel beams which are arranged on each side of the concrete foundation elements and in which a number of steel crossbeams are fixed at regular intervals between the main longitudinal beams. This construction can be made in a factory with great accuracy and thereafter large preassembled units can be transported to the place of installation where they can be placed into position by a crane or suchlike and fitted together. They can be dismounted again by a crane and transported away in large units. The invention will now be described further with reference to the accompanying drawings of an embodiment of the invention which does not limit its scope and in which: Fig.1. shows a weighbridge according to the invention in part longitudinal cross-section along line 1-1 of fig.2. Fig.2. shows a transverse cross-section of the weighbridge along line II-II of fig.1 on a larger scale. The weighbridge shown in the drawings comprises three prefabricated concrete foundation elements of which only 1 and 2 are shown in fig.1. These foundation elements 1 and 2 have a cross-section of 'U' form and are fixed to short prefabricated workfloors F1 and F2. These workfloors each comprise a slab of stabilised sand or concrete mixture. The outermost foundation element 1 has legs of unlike length with a longer outer leg 1a and a shorter inner leg 1b. In contrast to this, the middle one of the foundation elements has legs 2a and 2b of equal lengths. A steel supporting structure is arranged on the foundation elements 1 and 2 which is designated in its entirety by the reference numeral 6. This supporting construction 6 is supported in turn by suitable weighing means W (not shown). These weighing means W, which do not form part of the invention, are accomodated in the intermediate space which is visible in fig.1 between the underside of the supporting construction 6 and the upper side of the foundation elements 1 and 2. The weighing means W are also schematically shown in fig.2. on the lowermost outer longitudinal sides of the supporting construction 6. Preferably, the supporting construction 6 is a framework assembled from two main longitudinal steel beams 3 and 4 which are arranged on each side of the concrete foundation elements 1 and 2, and it further comprises a number of steel crossbeams 5 which are fixed at regular intervals S between the main longitudinal beams 3 and 4. In the embodiemt shown, the main longiudinal steel beams 3 and 4 have a cross-section of 'I' form whilst the steel crossbeams also have a cross-section of'I' form but which is smaller than that of the main steel longitudinal steel beams 3 and 4. Through this difference in the size of the cross-section, the upper flange 5a of the 'I' section crossbeams 5 lie at some distance below the upper flanges 3a and 4a of the main longitudinal steel beams 3 and 4. The beams 3, 4 and 5 are fixed together by the interposition of fishplates 6a and 6b in a suitable manner, by nuts and bolts for example. A number of extending prefabricated concrete tracks 7 and 8 with a width b smaller than the width B of the weighbridge are arranged on the steel crossbeams 5, These form the lanes for the passage of vehicles (not shown) thereover. These tracks 7,8 lie with outer longitudinal sides 7a and 8a against the inner longitudinal sides 3c and 4c of the main longitudinal steel beams 3 and 4. The uppermost sides of the tracks 7,8 preferably lie at the same height at the upper flanges 3a, 4a of the main longitudinal beams and by which means as wide as possible traffic lanes are obtained. Vertically standing steel safety-guards 3d and 4d are purposely welded to the upper flanges 3a and 4a of the longitudinal beams 3 and 4 to fence off the sides of the traffic lane. Furthermore, the overlong prefabricated concrete tracks 7 and 8 are provided with extending recesses 7c and 8c in the innermost longitudinal sides 7b and 8b thereof respectively for accomodating steel gratings 9 (shown in dashed lines) to give easy access for purposes of inspection and maintenance. The gratings lie in cast-in angle-irons 7d, 8d. As shown in fig. 1, the uppermost side of the longer leg 1a of the element 1 abuts with the uppermost dides 7e, 8e of the tracks 7, 8. Furthermore, the outer ends of the outermost foundation element 1has an extending piece which serves as a ramp 10. Preferably, the upperside of the extending portion 1c has a latching element 1d for locking into a corresponding latching element 10a on the underside of the innermost end of the prefabricated ride-on/ride-off ramp 10. These prefabricated ride-on/ride-off ramps have a longitudinal cross section in the form of a right-angled trapezium the base 10b of which is placed on the ground whilst the upperside of the short right-angled side 10c of the upperside of both the long leg 1a of the outermost foundation element 1 and the uppersides 7e, 8e of the concrete tracks 7,8 are arranged together.

Claims: A prefabricated and dismountable weighbridge for weighing vehicles comprising a platform assembled from at least partially prefabricated concrete elements (7,8) and ramps (10) arranged on a workfloor, whereby a number of short prefabricated concrete foundation elements (1,2) are arranged at regular intervals on a foundation layer (F1,F2), on which foundation layer (1,2) a steel supporting construction (3,4,5) is arranged and in which construction (3,4,5) the elements (7,8) are arranged and whereby weighing means are accommodated between the underside of the construction (3,4,5) and the upper side of the foundation elements (1,2). A weighbridge as claimed in claim 1 characterised in that the supporting construction (2,3,4,5) is a framework assembled from two main longitudinal steel beams (3,4) arranged on each side of the concrete foundation elements (1,2), a number of steel crossbeams (5) fixed at regular intervals S between the main longitudinal beams (3,4). A weighbridge as claimed in claim 1 or claim 2 characterised in that the short prefabricated concrete foundation elements (1,2) have a longitudinal cross-section of 'U' form. A weighbridge as claimed in any one of claims 1 to 3 inclusive characterised in that the main longitudinal steel beams (3,4) have a cross-section of 'I' form. A weighbridge as claimed in any one of the foregoing claims characterised in that the steel crossbeams have a cross-section of 'I' form which is smaller than the 'I' cross-section of the main longitudinal beams. A weighbridge as claimed in any one of the claims 1 to 5 inclusive provided with a number of extending prefabricated concrete tracks having a smaller width than that of the weighbridge and characterised in that the extending concrete tracks are arranged on the steel crossbeams to form a lane and which tracks (7,8) lie with the outer longitudinal sides (7a,8a) against the inner sides of the extending main beams (3,4) respectively. A weighbridge as claimed in any one of the foregoing claims 1 to 6 inclusive and characterised in that the extending prefabricated tracks (7,8) have extending recesses (7c,8c) on the innermost upper longitudinal sides (7b, 8b) for accomdating steel gratings (9) for making inspection and maintenance possible. A weighbridge as claimed in any one of the claims 1 to 7 inclusive and characterised in that the steel gratings (9) are supported by the steel angle-sections cast into the recesses (7c, 8c). A weighbridge as claimed in any one of claims 1 to 8 inclusive characterised in that the short prefabricated concrete foundation elements (1) of 'U' form cross-section arranged on the bridge platform have legs of unequal length and in which the outermost leg (1a) lies with its uppermost side flush with the uppermost sides (7e,8e) of the concrete tracks (7,8). A weighbridge as claimed in any one of claims 1 to 9 inclusive characterised in that an extension (1c) is arranged on the outermost ends of the outermost concrete foundation elements (1) to serve as tracks for a ride-on/ride-off ramp (10). A weighbridge as claimed in claim 10 characterised in this that a latch-element (1d) is provided on the extending portion (1c)for latching into a corresponding latching element (10a) on the underside of the innermost end of the prefabricated ride-on/ride-off ramp (10). A weighbridge as claimed in any one of the foregoing claims 1 to 11 inclusive and characterised in this that the prefabricated concrete ride-on/ride-off ramps (10) have a longitudinal cross-section of a right-angled trapezium the base (10b) of which is placed on the ground whilst the upperside of the short right-angled side (10c) is flush with uppermost side (1a) of both the long leg of the outermost foundation element (1) and the uppermost sides of the concrete tracks (7,8).

Inventors: VAN  LEIJSEN, CORNELIS GERARDUS RUMOLDUS, VAN LEIJSEN, CORNELIS GERARDUS RUMOLDUS
Applicants: WEBOTEC B.V.
Application year: 1987
Main classification: G01G19
IPC codes: G01G19, G01G21