JP2004116059A - Method of building corrugated steel plate web bridge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify construction work not only for lower floor boards but also for upper floor boards, with regard to a method of building a corrugated steel plate web bridge using corrugated steel plates. <P>SOLUTION: Suspended timbering 100 for the construction of the lower floor boards is suspended from a pair of corrugated steel plates 16 which constitutes a leading block B (n) where the upper floor boards are not yet constructed, and a pair of corrugated steel plates 16 which constitutes the block B (n + 1) next to the leading block B (n) is installed in advance. Thereafter, the suspended timbering 100 is moved to the corrugated steel plates 16 installed in advance, and under these conditions the lower floor board 14 which constitutes the next block B (n + 1) and the upper floor board 12 which constitutes the leading block B (n) are constructed. The upper floor board 12 is constructed by suspending a plurality of precast ribs 22 between the upper ends of both corrugated steel plates 16 at predetermined intervals in the direction of a bridge axis, then laying a plurality of precast plates 24 on the precast ribs 22, and placing upper floor board concrete 26 while the ribs and the precast plates as forms. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method of erection of a corrugated steel web bridge for each block of a predetermined length by overhanging construction.
[0002]
[Prior art]
The corrugated steel sheet web bridge is configured to extend in the bridge axis direction so as to form a box-shaped cross section with the upper deck, the lower deck, and a plurality of corrugated steel sheets connecting them, The erection is generally performed for each block of a predetermined length by overhanging construction.
[0003]
At that time, an erection method using a corrugated steel plate is also adopted (for example, see “Non-Patent Document 1”). In this erection method, a plurality of corrugated steel sheets constituting a block next to the top block are suspended in a state in which a suspension support for the construction of the bottom slab is suspended on a plurality of corrugated steel sheets constituting the top block without the top slab. After the steel plates are erected in advance, the suspension supports are moved to these erected steel plates, and in this state, the construction of the lower slab constituting the next block and the construction of the upper slab constituting the head block are performed. It has become.
[0004]
[Non-patent document 1]
"Prestressed Concrete", Japan Prestressed Concrete Technology Association, Vol. 44, No. 1, January 31, 2002, p. 55
−57
[Problems to be solved by the invention]
The construction efficiency can be improved by constructing the upper slab and the lower slab in parallel in separate blocks as described above, but the construction of the upper slab and the lower slab itself is performed by cast-in-place using a formwork. It is done in.
[0005]
At that time, the construction of the lower slab can be performed to some extent efficiently by using the suspension support, but the construction of the upper slab has the following problems.
[0006]
In other words, for the box-shaped cross section of the upper slab, the support is erected from the lower slab, and the slab of the upper slab is installed. Construction work is being carried out by projecting beams for erection from. Therefore, the construction is still troublesome in these points, and there is a problem that it is insufficient to reduce the construction cost and the construction period.
[0007]
The present invention has been made in view of such circumstances, and in a method of erection of a corrugated steel sheet web bridge using corrugated steel sheets, simplification of construction not only for the construction of the lower slab but also for the construction of the upper slab. It is an object of the present invention to provide a method of erection of a corrugated steel sheet web bridge capable of achieving the following.
[0008]
[Means for Solving the Problems]
The invention of the present application is intended to achieve the above object by performing the construction of the upper floor slab using predetermined precast ribs and precast plates.
[0009]
That is, the method of erection of the corrugated steel web bridge according to the present invention is as follows.
In a method of erection of a corrugated steel sheet web bridge extending in the bridge axis direction so as to form a box-shaped cross section with an upper slab, a lower slab, and a plurality of corrugated steel sheets connecting them, by overhanging construction for each block of a predetermined length. ,
A plurality of corrugated steel sheets constituting the block next to the above-mentioned top block were erected in advance in a state in which the suspension support for the lower deck slab was suspended on the plurality of corrugated steel sheets constituting the top block without the upper slab. After that, the suspension support is moved to these pre-installed corrugated steel plates, and in this state, the construction of the lower slab constituting the next block and the construction of the upper slab constituting the top block are performed. Is composed of
The construction of the upper floor slab, while extending a plurality of precast ribs at predetermined intervals in the bridge axis direction between upper ends of the plurality of corrugated steel plates, and laying a plurality of precast plates on these precast ribs, The precast ribs and the precast plates are used as a formwork, and the upper floor slab concrete is cast to be formed.
[0010]
The specific shape and number of the “precast ribs” are not particularly limited as long as the “precast ribs” are configured so as to be able to be bridged between upper end portions of a plurality of corrugated steel plates.
[0011]
The above-mentioned "precast board" is a concrete form or laying as long as it can form a formwork for placing concrete on the upper slab by laying the precast board on the precast ribs. The number of sheets and the like are not particularly limited.
[0012]
Operation and Effect of the Invention
As shown in the above configuration, the method of erection of the corrugated steel sheet web bridge according to the invention of the present application is a method in which a plurality of corrugated steel sheets constituting the top block without the upper slab are suspended with the suspension support for the lower slab. Then, after a plurality of corrugated steel plates constituting the block next to the first block are erected in advance, the suspension supports are moved to these erected corrugated steel plates, and in this state, the lower floor slab constituting the next block is formed. Since the construction and the construction of the top floor slab constituting the top block are performed, the upper slab and the lower slab can be constructed in parallel in separate blocks, thereby increasing construction efficiency. . In addition, the use of the suspension shoring enables the construction of the lower slab to be performed to some extent efficiently.
[0013]
In particular, in the present invention, the construction of the upper floor slab, the plurality of precast ribs are bridged between the upper ends of the plurality of corrugated steel plates at predetermined intervals in the bridge axis direction, and a plurality of precast plates are placed on these precast ribs. After laying, these precast ribs and precast plates are used as the formwork to cast concrete on the upper floor slab. The construction of the upper slab can be performed more easily than the construction of the upper slab by projecting a beam for erection from the slab portion.
[0014]
As described above, according to the invention of the present application, in the method of erection of the corrugated steel sheet web bridge using the corrugated steel sheet, not only the construction of the lower floor slab but also the construction of the upper floor slab can be simplified. Thus, it is possible to further reduce the construction cost and the construction period.
[0015]
In the above configuration, a plurality of corrugated steel sheets are provided at three or more locations at predetermined intervals in a direction orthogonal to the bridge axis, and each precast rib is bridged between adjacent corrugated steel sheets among the plurality of corrugated steel sheets. Then, even when the width of the upper slab is large, it is possible to prevent the weight of each precast rib from becoming excessive, thereby maintaining the ease of construction of the upper slab.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0017]
FIG. 1 is a perspective view showing a state in which a corrugated steel web bridge 10 to which an erection method according to an embodiment of the present invention is applied is being erected.
[0018]
As shown in the figure, the corrugated steel web bridge 10 extends in the bridge axis direction so as to form a box-shaped cross section by an upper slab 12, a lower slab 14, and a pair of right and left corrugated steel plates 16 connecting these. I have. Each corrugated steel plate 16 includes a corrugated steel plate main body 16A, and upper and lower flange portions 16B and 16C joined to upper and lower ends thereof. Then, the corrugated steel web bridge 10 is constructed for each block of a predetermined length by overhanging construction.
[0019]
This figure shows the corrugated steel web bridge 10 at the time when the erection of the block B (n-1) on the front side of the head block B (n) is completed. At this time, the head block B (n) is The construction of the lower slab 14 and the corrugated steel plates 16 has been completed, but the construction of the upper slab 12 has not been performed yet.
[0020]
FIG. 2 is a perspective view showing a process of erection of the corrugated steel sheet web bridge 10. FIGS. 3 and 4 are a side view and a cross-sectional view orthogonal to the bridge shaft, respectively, showing the erection process. FIG. 4 is a cross-sectional view orthogonal to the bridge axis in the first block B (n). The steps (a) to (d) in FIGS. 3 and 4 correspond to the steps (a) to (d) in FIG.
[0021]
The erection of the corrugated steel web bridge 10 is performed as follows.
[0022]
First, as shown in FIG. 1, a suspension supporter 100 for lower floor slab construction in which a simplified formwork 102 is attached to a pair of corrugated steel plates 16 constituting a top block B (n) on which no upper slab slab has been constructed. In the suspended state, as shown in FIG. 2A, a pair of corrugated steel plates 16 constituting a block B (n + 1) next to the head block (n) is erected in advance. The preceding installation of each corrugated steel plate 16 is performed using a crane or the like.
[0023]
Next, as shown in FIG. 2B, the suspension supporter 100 is moved to the pair of corrugated steel plates 16 erected in advance, and is installed at the position of the next block B (n + 1).
Then, the plurality of precast ribs 22 constituting the upper floor slab 12 of the head block B (n) are extended between the upper ends of both corrugated steel plates 16 at predetermined intervals in the bridge axis direction and extend in the bridge axis orthogonal direction. To place.
[0024]
When this arrangement is completed, as shown in FIG. 2 (c), a plurality of precast plates 24 are laid on the precast ribs 22, and the reinforcing steel and the upper floor slab side fastening steel are arranged on these precast plates 24. At the same time, rebar assembly of the lower floor slab 14 is performed on the simplified formwork 102 of the next block B (n + 1).
[0025]
Then, as shown in FIG. 2 (d), in the head block B (n), the upper floor slab concrete 26 is poured using the precast rib 22 and the precast plate 24 as a formwork, and the lower block B (n + 1) in the next block B (n + 1). The concrete slab 28 is cast and cured. Thereafter, in the top block B (n), prestress is introduced into the upper deck slab laterally tightened steel material 30 to perform lateral tightening of the upper slab concrete 26, and insert and tension the outer cable.
[0026]
When the erection of the first block B (n) is completed by the above steps, the erection of the next block B (n + 1) is performed by the same steps, and thereafter the erection by overhanging is performed in the same manner.
[0027]
As described in detail above, the method of erection of the corrugated steel sheet web bridge 10 according to the present embodiment uses the pair of corrugated steel sheets 16 constituting the top block B (n) on which the upper slab is not installed, for mounting the lower slab. In a state where the suspension supporter 100 is suspended, a pair of corrugated steel plates 16 constituting a block B (n + 1) next to the head block B (n) are erected in advance, and then suspended on these erected corrugated steel plates 16. The shoring 100 is moved, and in this state, the construction of the lower slab 14 constituting the next block B (n + 1) and the construction of the upper slab 12 constituting the head block B (n) are performed. Therefore, the upper floor slab 12 and the lower floor slab 14 can be constructed in parallel in separate blocks, thereby increasing construction efficiency. In addition, the use of the suspension supports 100 enables the construction of the lower slab 12 to be performed to some extent efficiently.
[0028]
In particular, in the present embodiment, the construction of the upper floor slab 12 is such that the plurality of precast ribs 22 are bridged between the upper ends of the pair of corrugated steel plates 16 at predetermined intervals in the bridge axis direction, and After laying a plurality of precast plates 24, the precast ribs 22 and the precast plates 24 are used as a formwork, and the upper floor concrete 26 is cast. The construction of the upper slab 12 can be performed more easily than the construction of the upper slab by erecting a shoring and extending the erection beam from the constructed overhanging slab portion.
[0029]
As described above, according to the present embodiment, not only the construction of the lower slab 14 but also the construction of the upper slab 12 can be simplified, thereby further reducing the construction cost and shortening the construction period. .
[0030]
In the above embodiment, the case where a pair of corrugated steel plates 16 are provided on both sides of the lower floor slab 14 in the direction orthogonal to the bridge axis has been described. However, even in the case where the corrugated steel plates 16 are provided at three or more locations, the above embodiment is also applicable. By adopting the same erection method, the same operation and effect as those of the above embodiment can be obtained.
[0031]
FIG. 5 is a view similar to FIG. 2 and shows a modification of the above embodiment.
[0032]
The corrugated steel sheet web bridge 50 to be erected in the present modified example has a larger width of the upper slab 12 than the corrugated steel sheet web bridge 10 of the above embodiment.
[0033]
Although the erection method of this modification is basically the same as the erection method of the above embodiment, in this modification, the corrugated steel plate 16 is attached to both sides of the lower floor slab 14 in the direction orthogonal to the bridge axis and the central part in the direction orthogonal to the bridge axis. In three places. Further, in this modification, the precast ribs 22A obtained by bisecting the precast ribs 22 of the above embodiment in the longitudinal direction are used, and each of the precast ribs 22A is disposed on each of the corrugated steel sheets located on both sides in the direction orthogonal to the bridge axis. 16 and the corrugated steel plate 16 located at the center in the direction perpendicular to the bridge axis.
[0034]
By adopting such an erection method, even when the width of the upper slab 12 is large, as in the case of the corrugated steel web bridge 50, it is possible to prevent the weight of each precast rib 22A from becoming excessive. Thereby, the facilitation of construction of the upper floor slab 12 can be maintained.
[0035]
In addition, even when the corrugated steel plate 16 is provided at four or more places at predetermined intervals in the direction orthogonal to the bridge axis, the precast rib 22 of the above embodiment is divided into a plurality of precast ribs in the longitudinal direction, and these divided parts are divided. If the respective precast ribs are bridged between the corrugated steel plates adjacent to each other, it is possible to obtain the same operation and effects as those of the above-described modification.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a corrugated steel sheet web bridge to which a method of erection according to an embodiment of the present invention is applied, in a state of being erected. FIG. 2 is a perspective view showing a erection step of the corrugated steel sheet web bridge. FIG. 3 is a side view showing the erection step. FIG. 4 is a cross-sectional view orthogonal to the bridge axis showing the erection step. FIG. 5 is a view similar to FIG. 2 showing a modification of the embodiment.
10, 50 corrugated steel plate web bridge 12 upper floor slab 14 lower floor slab 16 corrugated steel plate 16A corrugated steel plate main body 16B upper flange portion 16C lower flange portion 22, 22A precast rib 24 precast plate 26 upper slab concrete 28 lower slab concrete 30 upper slab side Fastening steel material 100 Suspension support 102 Simple formwork B (n-1) Block B (n) on the near side Head block B (n + 1) Next block

Claims (2)

In a method of erection of a corrugated steel sheet web bridge extending in the bridge axis direction so as to form a box-shaped cross section with an upper slab, a lower slab, and a plurality of corrugated steel sheets connecting them, by overhanging construction for each block of a predetermined length. ,
A plurality of corrugated steel sheets constituting the block next to the above-mentioned top block were erected in advance in a state in which the suspension support for the lower deck slab was suspended on the plurality of corrugated steel sheets constituting the top block without the upper slab. After that, the suspension support is moved to these pre-installed corrugated steel plates, and in this state, the construction of the lower slab constituting the next block and the construction of the upper slab constituting the top block are performed. Is composed of
The construction of the upper floor slab, while extending a plurality of precast ribs at predetermined intervals in the bridge axis direction between upper ends of the plurality of corrugated steel plates, and laying a plurality of precast plates on these precast ribs, A method of erection of a web bridge of corrugated steel plates, wherein the method is carried out by placing concrete on the upper floor slab using the precast ribs and the precast plates as a formwork. The plurality of corrugated steel sheets are provided at three or more locations at predetermined intervals in a direction orthogonal to the bridge axis,
The method for erection of a web bridge of corrugated steel sheets according to claim 1, wherein each of the precast ribs is bridged between adjacent ones of the plurality of corrugated steel sheets.

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