JP2006307575A - Overhang construction method for corrugated steel sheet web bridge and installation work vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an overhang construction method for a corrugated steel sheet web bridge capable of reducing the size of an installation work vehicle, a construction period, and construction cost. <P>SOLUTION: The upper and lower floor slab concretes of an extension part are deposited in separate steps. Narrow web joining part concretes 31 and 32 connected to the upper and lower ends of a corrugated steel sheet web are deposited in one step, and the floor slab concretes 41 and 42 at the other portions are deposited in the other step. An installation work vehicle is advanced onto an already constructed web connection part concrete 31, the corrugated steel sheet web 22 equivalent to one block is extended forward from the corrugated steel sheet web 21 on which the web joining part concrete 31 is deposited, and the upper and lower floor slab concretes 41 and 42 integrally forming the web joining part concrete 32 of the extended corrugated steel sheet web 22 with the already constructed web joining part concrete 31 are simultaneously constructed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a corrugated steel web bridge overhanging method using corrugated steel sheets for webs, and a construction work vehicle used in such a corrugated steel web bridge overhanging method.

  Conventionally, as a method of constructing a corrugated steel web bridge using corrugated steel webs, an overhang construction method is known in which a bridge body is added for each block from the pier toward the center of the span, and cantilever construction is performed ( For example, refer nonpatent literature 1.). In this overhanging construction method, an erection work vehicle (wagen) in which a work table, a loading concrete receiving mechanism and a lifting equipment are integrated is used.

This overhang construction method does not require the construction of support works, so it is not subject to landform or traffic restrictions at the bridge point. For example, it can be installed in mountain valleys, on the sea, on existing roads, etc. Is easy.
Kazuyuki Mizuguchi and five others, Design and construction of Motoya Bridge-Corrugated steel sheet web PC box girder bridge by overhang construction method, "Bridge and foundation", Construction books, Inc., September 1, 1998, Vol. 32, No. 9, p. 2-10

  Generally, in the method of extending a corrugated steel web bridge, the concrete formwork on which the corrugated steel web is arranged is held by the construction work vehicle and the upper and lower floor slab concrete is placed. And the ability to support the total weight of the concrete formwork and upper and lower floor slab concrete to be cantilevered is required. In addition, the corrugated steel sheet web that is projected needs to be disposed with increased rigidity, and there is a problem that reinforcement is required.

  In view of the above circumstances, the present invention is a method for overhanging a corrugated steel web bridge in which downsizing of a construction work vehicle, shortening of a construction period, and cost are achieved, and a method of overhanging such a corrugated steel web bridge It aims at providing the construction work vehicle used for.

  The overhang construction method of the corrugated steel web bridge of the present invention that achieves the above object is to connect the upper and lower floor slab concrete of the overhang to the upper and lower ends of the corrugated steel web, respectively. Narrow web joint concrete and other portion of floor slab concrete to be placed in a separate process, and the base frame of the carriage of the construction work vehicle is advanced on the web joint concrete, and the web A corrugated steel sheet web for one block is stretched forward from the corrugated steel sheet web that has already been subjected to the jointed concrete, and then the upper and lower floor slabs that are integrated with the web joint concrete of the corrugated steel sheet web and the existing web joint concrete are constructed. The above process is repeated.

  Here, the web joint concrete referred to in the present invention is a partial concrete of the upper and lower floor slabs, and is integrated with the corrugated steel sheet web to the weight of the construction work vehicle and the weight of various members supported by the construction work vehicle. It refers to a concrete portion having a rigidity that can resist. For example, the corrugated steel sheet web may have a structure in which the corrugated steel sheet web and the upper and lower floor slab concrete are bonded by embedding the upper and lower ends of the corrugated steel sheet web in the upper and lower floor slab concrete. It may have a structure in which corrugated steel sheet webs and upper and lower floor slab concrete are joined by a stud joining method or other gibber type through a flange plate in which is welded.

  In the overhang construction method of the corrugated steel web bridge according to the present invention, the erection work vehicle includes a corrugated steel web for one block projecting forward from the corrugated steel web that has already been subjected to the concrete construction of the web coupling portion, and the corrugated steel web that is stretched. What is necessary is just to have the capacity | capacitance which can support the weight of the web coupling | bond part concrete cast | placed with respect to upper and lower ends, and the concrete formwork by cantilever. Therefore, when one block is overlaid with a length equal to the length of one block in the conventional overhang construction method described above, the total of the conventional upper and lower floor slab concrete to be placed with the corrugated steel sheet web and the concrete formwork. Tensioning is done using a small, simple construction vehicle with a greatly simplified structure because the weight of the concrete supported by the cantilever is less than that of a construction vehicle that requires the ability to support the weight with a cantilever. Can be constructed. In addition, the method of overhanging the corrugated steel web bridge of the present invention is to simultaneously construct the upper and lower floor slabs that are integrated with the web joint concrete of the corrugated steel web and the existing web joint concrete, When one block is overlaid with a length equal to the length of one block in the above-described conventional overhang construction method, the number of constructions is equal to the number of constructions when the conventional corrugated steel web bridge is overhanged. Overhanging can be carried out using a small construction work vehicle, and the cost can be reduced. In addition, when constructing the upper and lower floor slabs to be integrated with the existing web joint concrete, the upper floor slab may be used as a cast-in-place member and the lower floor slab may be used as a precast member, or both the upper and lower floor slabs may be used. It may be a spot-on-site member.

  Moreover, in the overhang construction method of the corrugated steel web bridge according to the present invention, when overhanging is performed using an erection work vehicle having the same capacity as the conventional erection work vehicle described above, one block is used as the conventional erection work described above. Since the overhang construction can be carried out with a length longer than the length of one block in the overhang construction method, the construction period can be shortened, and also in this case, the cost can be reduced.

  The construction work vehicle of the present invention that achieves the above object is a construction work vehicle used in a method for overhanging a corrugated steel web bridge, and includes a base frame having a length corresponding to two blocks of overhanging girders. The upper and lower floor slab web connecting part concrete constructed on the upper and lower ends of one block of corrugated steel sheet web that extends to the base frame, and the overhanging frame that supports the concrete formwork, The girder block upper floor slab concrete and its concrete formwork are suspended above.

  In the erection work vehicle of the present invention, the upper frame supports one block of a corrugated steel sheet web projecting forward, the web connecting part concrete constructed on the upper and lower ends of the corrugated steel sheet web, and the concrete formwork thereof. It is. Therefore, the erection work vehicle of the present invention is more difficult than a conventional erection work vehicle that requires the ability to support the total weight of the upper and lower floor slab concrete to be cast with the corrugated steel sheet web and the concrete formwork. The weight of the concrete to be held and supported is extremely small, the ability and structural function of the frame and the reaction force device are simplified, and the weight and size can be reduced.

  Here, in the erection work vehicle of the present invention, the erection work vehicle suspends the upper floor plate or upper and lower floor slab concrete of the girder block and the concrete formwork thereof from the overhanging upper frame above the base frame. That's fine.

  It is not necessary to support the overturning moment due to the suspended load, and it is only necessary to support these vertical loads. Therefore, the construction work vehicle is simplified.

  According to the overhanging method for corrugated steel web bridges of the present invention, when one block is overhanged with a length equal to the length of one block in the conventional overhanging method described above, the conventional construction work vehicle However, since the weight of the concrete supported by the cantilever is small, the number of placements when the conventional corrugated steel web bridge is overhanged using a small simple construction work vehicle whose structure is greatly simplified Overhang construction can be performed with the same number of placements, and the cost can be reduced. Moreover, according to the overhang construction method of the corrugated steel web bridge of the present invention, when overhanging is performed using an erection work vehicle having the same capacity as the conventional erection work vehicle described above, one block is Since the overhang construction can be carried out with a length longer than the length of one block in the conventional overhang construction method, the construction period can be shortened, and also in this case, the cost can be reduced.

  In addition, the construction work vehicle of the present invention has a much smaller weight of concrete supported by cantilever than the conventional construction work vehicle, and the capabilities and structural functions of the frame and reaction force device are simplified, and the weight and size are reduced. can do.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIGS. 1-7 is explanatory drawing explaining each process of the overhang construction method of the corrugated steel web bridge to which one Embodiment of this invention was applied. FIG. 1 is a perspective view for explaining a construction process of the present invention, and shows a state in which an erection work vehicle is not shown. 2, FIG. 4 and FIG. 6 are side views showing the erection process of the embodiment. 3, 5, and 7 are plan views of FIGS. 2, 4, and 6, respectively, showing a state in which the construction work vehicle is not shown.

  Hereinafter, the construction procedure of the corrugated steel web bridge overhang construction method in which the corrugated steel sheet is used for the web and the embedded joining method is applied as the joining method of the corrugated steel sheet web and the upper and lower floor slabs will be described. In this embodiment, as shown in FIG. 2 and FIG. 3, of the upper and lower floor slab concrete, the narrow web connecting portion concrete 31 that is respectively connected to the upper and lower ends of the corrugated steel plate web 21 is embedded and bonded. It will be explained from the state where it has already been applied and applied. This web joint concrete is an embodiment of the web joint concrete of the present invention. As a method of joining the corrugated steel web and the upper and lower floor slabs, for example, the corrugated steel plate via a flange plate in which stud gibbles are fused. A stud joining method for joining the web and the upper and lower floor slabs or other gibber type may be applied.

  First, as shown in FIGS. 2 and 3, a base frame 11 having a length corresponding to two blocks of an overhanging girder of a construction work vehicle 10 which is an embodiment of the construction work vehicle of the present invention has already been constructed. The web connecting portion is advanced on the concrete 31. The web connecting portion concrete 31 is a partial concrete of upper and lower floor slabs having a rectangular cross section in which the upper and lower ends of the corrugated steel sheet web 21 are embedded by an embedding method, and is integrated with the corrugated steel sheet web 21 for installation work. It is a concrete portion having rigidity capable of resisting the weight of the vehicle 10 and the weight of various members supported by the construction work vehicle 10.

  A lifting facility (not shown) is provided on the upper frame 12 of the construction work vehicle 10. With this lifting equipment, the corrugated steel sheet web 22 for one block is suspended, and the suspended corrugated steel sheet web 22 is projected forward from the corrugated steel sheet web 21 on which the web connecting portion concrete 31 is constructed, and cantilevered. Support. If the corrugated steel sheet web and the upper and lower floor slabs are connected using the stud joining method or other gibber type, the corrugated steel sheet webs may be joined together with an attachment plate or provided on both corrugated steel sheet webs. It is good also as a structure which couple | bonded the produced flange plates or uses both together.

  A work table 13 on which a web joint concrete formwork and an upper floor slab formwork, which will be described later, are mounted is suspended from a top frame 12 of the construction work vehicle 10 by a lifting tool 14.

  Next, a web coupling portion concrete form (not shown) for placing the web coupling portion concrete on the upper and lower ends of the corrugated steel sheet web 22 that is placed on the work table 13 is already applied. The corrugated steel sheet web 22 is cantilevered and supported forward from the connecting part concrete 31.

  In addition, an upper and lower floor slab concrete form (not shown) for assembling the upper and lower floor slab concrete that is mounted on the work table 13 and is integrated with the already-constructed web joint concrete 31 is assembled.

  Next, as shown in FIGS. 1, 4, and 5, the web coupling portion concrete 32 of the corrugated steel sheet web 22 that is overhanged, and the upper floor slab concrete 41 and the lower floor slab that are integrated with the existing web coupling portion concrete 31 are provided. Concrete 42 is placed and cured at the same time, and prestress is introduced into the cured concrete.

  In the present embodiment, as the upper and lower floor slab concrete 41 and 42 to be integrated with the already-constructed web connecting portion concrete 31, an example is given in which both the upper and lower floor slab concrete 41 and 42 are made of a cast-in-place member. The floor slab concrete 42 may be a precast member. In this case, the lower floor slab concrete 42, which is a precast member, is disposed in the lifting equipment provided on the upper frame 12 and integrated with the already-constructed web joint concrete 31.

  Alternatively, a precast member may be attached to the already-fabricated web connecting portion concrete 31 as a form of the lower floor slab concrete 42, and the concrete may be cast on-site thereon to be integrated.

  Next, as shown in FIGS. 6 and 7, the base frame 11 of the carriage of the construction work vehicle 10 is placed on the constructed web joint concrete 32 described with reference to FIGS. 1, 4, and 5. The process described above with reference to FIGS. 1 to 5 is repeated.

  As described above, the erection work vehicle 10 is placed on the corrugated steel sheet web for one block projecting forward from the corrugated steel sheet web that has been subjected to the concrete construction of the existing web coupling portion, and the upper and lower ends of the corrugated steel sheet web that is projected. What is necessary is just to have the capacity | capacitance which can support the weight of web connection part concrete and its concrete formwork by cantilever. Therefore, when one block is overhanged with a length equal to the length of one block in the conventional overhanging method described above, the total of the conventional upper and lower floor slab concrete to be placed with the corrugated steel sheet web and the concrete formwork. Tensioning is done using a small, simple construction vehicle with a greatly simplified structure because the weight of the concrete supported by the cantilever is less than that of a construction vehicle that requires the ability to support the weight with a cantilever. Can be constructed. In addition, the method of overhanging the corrugated steel web bridge according to the present invention is to simultaneously construct the upper and lower floor slabs integrated with the web joint concrete of the corrugated steel web and the existing web joint concrete, When one block is overhanged with a length equal to the length of one block in the conventional overhang construction method described above, the number of constructions is equal to the number of times of construction when the conventional corrugated steel web bridge is overhanged. Overhanging can be carried out using a small construction work vehicle, and the cost can be reduced.

  Moreover, in the overhang construction method of the corrugated steel web bridge according to the present invention, when overhanging is performed using an erection work vehicle having the same capacity as the conventional erection work vehicle described above, one block is used as the conventional erection work described above. Since the overhang construction can be carried out with a length longer than the length of one block in the overhang construction method, the construction period can be shortened, and also in this case, the cost can be reduced.

  In the above-described embodiment, as the web connecting portion concrete of the present invention, the corrugated steel sheet web and the upper and lower floor slab concrete are embedded by embedding the upper and lower ends of the corrugated steel sheet web in the upper and lower floor slab concrete. Although the example of the bonded web connecting portion concrete was given, the present invention is not limited to this. For example, the corrugated steel sheet web and the upper and lower floor slab concrete are joined via a flange plate on which stud gibbles are implanted. It may be a web joint concrete which is joined by a stud joining method or other gibber type.

It is a perspective view explaining the construction process of this invention. It is a side view which shows the construction process of an Example. FIG. 3 is a plan view of FIG. 2. It is a side view which shows the construction process of an Example. FIG. 5 is a plan view of FIG. 4. It is a side view which shows the construction process of an Example. FIG. 7 is a plan view of FIG. 6.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Construction work vehicle 11 Base frame 12 Upper frame 13 Work table 14 Lifting equipment 21,22 Corrugated steel sheet web 31,32 Web joint concrete 41 Upper floor slab concrete 42 Lower floor slab concrete

Claims (3)

  When the corrugated steel web bridge is overhanged, the upper and lower floor slab concrete of the overhang is divided into the narrow web joint concrete that connects to the upper and lower ends of the corrugated steel web and the other part of the floor slab concrete. The base frame of the carriage of the construction work vehicle is advanced on the web joint concrete, and the corrugated steel web corresponding to one block is moved forward from the corrugated steel web subjected to the web joint concrete construction. Overhanging corrugated steel sheet web bridge, characterized by constructing the web joint concrete of the corrugated steel sheet web that has been overhanged and the upper and lower floor slabs integrated with the existing web joint concrete, and repeating the above steps Construction method.   A construction work vehicle used in a method for overhanging a corrugated steel web bridge, comprising a base frame having a length corresponding to two blocks of an overhanging girder and constructed at the upper and lower ends of a corrugated steel web of one block projecting forward. An erection work vehicle comprising a web connecting portion concrete for upper and lower floor slabs and an overhanging frame for supporting the concrete formwork.   3. The erection work according to claim 2, wherein the erection work vehicle suspends the upper floor plate or upper and lower floor slab concrete of the girder block and the concrete formwork thereof from an overhanging upper frame above the base frame. car.

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