JP6902760B2 - How to build a concrete structure - Google Patents

Description

The present invention relates to a method for constructing a concrete structure.

At present, there is a strong concern that the number of on-site workers working at construction sites will decrease due to the declining population and the declining birthrate and aging population. Recently, in order to improve productivity at construction sites, many sites for assembling formwork, reinforcing bars, scaffolding, temporary support, etc., even for various concrete structures such as large box culverts. There is a growing demand for construction methods that allow the use of partially precast concrete blocks, rather than relying solely on cast-in-place concrete, which requires workers.

However, when trying to construct a large concrete structure using a plurality of precast concrete blocks, the individual precast concrete blocks have to be enlarged, which makes manufacturing, transportation, and construction difficult. Will face. For this reason, in the past, when constructing a large-scale concrete structure, most of the parts had to depend on cast-in-place concrete.

In order to solve this problem, a large-scale concrete structure (so-called half-precast concrete structure) that uses cast-in-place concrete together with a block made of precast concrete of a size that can be manufactured, transported, and constructed has been constructed. It is being considered.

However, when constructing a large half-precast concrete structure, a considerable number of blocks made of a plurality of precast concrete divided into small pieces are required. For this reason, from the examination stage, the work of loading and unloading a plurality of precast concrete blocks at the site and accurately assembling and installing the precast concrete blocks in a desired shape becomes extremely complicated. The problem was pointed out.

If an integral structure is used in which concrete blocks are directly brought into contact with each other via a connecting member, cracks are likely to occur due to local stress concentration due to the non-landing of the contact surface. Because there is a problem that it is difficult to adjust the installation error due to non-landing and the dimensional error that occurs between multiple integrated structures at the site, the stress of the joint is evenly applied to the whole. There is a demand for a highly flexible construction method that can transmit and can suitably adjust installation errors and dimensional errors during installation.

JP-A-2007-146641

The present invention has been made in view of the above circumstances, and provides a method capable of suitably constructing a relatively large concrete structure by using cast-in-place concrete together with a member made of precast concrete. It is in.

That is, the present invention has the following configuration.

The invention according to claim 1 is a method for constructing a concrete structure including a base and a wall body erected on the base, wherein the wall body is made of precast concrete. It was formed by placing cast-in-place concrete in a second panel made of precast concrete and a cast-in-place concrete arrangement space provided between the first panel and the second panel. It is provided with a cast-in-place wall body component, and the step for forming the wall body connects the first panel and the second panel arranged apart from each other by a temporary holding member. A panel unit manufacturing process for manufacturing a panel unit configured so that the first and second panels can be integrally transported together with the temporary holding member, and the panel unit is transported to a predetermined position of the base. After passing through the panel unit transport installation step and the panel unit transport and installation step, the temporary holding member detaching step of detaching the temporary holding member from the first and second panels, and the temporary holding member detaching step. It is a method of constructing a concrete structure including a wall-casting step of placing cast-in-place concrete in the cast-in-place concrete arrangement space.

According to a second aspect of the present invention, the temporary holding member has one end attached to one end face of the first panel and the other end attached to one end face of the second panel, and one end. The method for constructing a concrete structure according to claim 1, wherein is attached to the other end face of the first panel and the other end is both or one of the members attached to the other end face of the second panel. is there.

The invention according to claim 3 includes a step of arranging a plurality of the panel units next to each other in the horizontal direction in the panel unit transport installation step, and is adjacent to each other and between end faces of the adjacent first panels. The construction of the concrete structure according to claim 2, wherein a gap through which the temporary holding member released by the temporary holding member detaching step can pass is provided in both or one of the end faces of the second panel. The method.

The invention according to claim 4 is the method for constructing a concrete structure according to claim 3, wherein the gap is set to a size of 5 to 25 cm.

The invention according to claim 5 is the method for constructing a concrete structure according to claim 3 or 4, wherein the wall casting step includes a step of casting cast-in-place concrete in the gap.

The invention according to claim 6 includes the step of arranging the plurality of the panel units next to each other in the horizontal direction in the panel unit transport installation step, and the step of releasing the temporary holding member is at least adjacent to the panel. The method for constructing a concrete structure according to any one of claims 1 to 5, which includes a step of arranging external force distribution bars so as to communicate with each cast-in-place concrete arrangement space of the unit. ..

In the invention according to claim 7, the first panel and the second panel have a substantially rectangular plate shape, and are substantially parallel to each other when the panel unit is configured. The method for constructing a concrete structure according to any one of 6.

The invention according to claim 8 is claimed 1 in which a reinforcing steel material that cantileverly protrudes in the cast-in-place concrete arrangement space is provided on both or one of the first and second panels. The method for constructing a concrete structure according to any one of items 7 to 7.

The invention according to claim 9 is any one of claims 1 to 8, wherein the base is a bottom slab of a box culvert, and the wall body is a left and right side slab provided on the bottom slab of the box culvert. This is the method for constructing a concrete structure according to item 1.

As described above, according to the present invention, it is possible to provide a method capable of suitably constructing a relatively large-sized concrete structure by using cast-in-place concrete together with a member made of precast concrete.

The perspective view which shows one Embodiment of this invention. Front view in the same embodiment. Partially enlarged right side view in the same embodiment. FIG. 5 is a cross-sectional view taken along line XX in the same embodiment. The front view explaining the panel unit in the same embodiment. The perspective view explaining the panel unit in the same embodiment. A schematic perspective view (bottom slab placing process) for explaining a method of constructing a concrete structure in the same embodiment. A schematic perspective view (lower panel unit transport installation step) for explaining a method of constructing a concrete structure in the same embodiment. A schematic perspective view (lower panel unit transport installation process) for explaining a method of constructing a concrete structure in the same embodiment. A schematic perspective view (temporary holding member detachment step) for explaining a method of constructing a concrete structure in the same embodiment. A schematic perspective view (upper panel unit transport installation step) for explaining a method of constructing a concrete structure in the same embodiment. A schematic perspective view (temporary holding member detachment step) for explaining a method of constructing a concrete structure in the same embodiment. A schematic perspective view (side slab placing process) for explaining the construction method of the concrete structure in the same embodiment. A schematic perspective view (side slab placing process) for explaining the construction method of the concrete structure in the same embodiment. A schematic perspective view (top plate block transport installation step) for explaining a method of constructing a concrete structure in the same embodiment. A schematic perspective view (top plate panel transport installation step) for explaining a method of constructing a concrete structure in the same embodiment. A schematic perspective view (top slab placing process) for explaining a method of constructing a concrete structure in the same embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 17.

This embodiment is an application of the present invention to a box culvert A, which is a concrete structure.

As shown in FIGS. 1 to 4, the box culvert A includes a bottom slab B which is a base provided on the foundation E, and left and right side slabs C which are walls erected at both ends of the bottom slab B. It is provided with a top plate D erected between the upper ends of the left and right side plates C.

The box culvert A is made by using a plurality of precast concrete members and a portion formed by placing cast-in-place concrete M in combination, as will be described in detail later.

<< Bottom plate B >>
The bottom slab B is formed by placing cast-in-place concrete M in a predetermined formwork (not shown). Reinforcing bars (not shown) are arranged inside the bottom plate B.

On the bottom slab B, an outer connecting reinforcing bar v1 extending in the vertical direction is erected according to the position where the lower panel 1 on the outer air side is arranged, and a position where the lower panel 2 on the inner air side is arranged. An inner connecting reinforcing bar v2 extending in the vertical direction is erected in accordance with the above.

The outer and inner connecting reinforcing bars v1 and v2 are located inside the mortar-filled joint tz provided at the lower ends of the lower panels 1 and 2 on the outer and inner air sides.

<< Side version C >>
The left and right side plates C are the first panel, the lower panel 1 on the outer air side, and the second panel, the lower panel 2 on the inner air side, which are arranged on the left and right sides of the bottom plate B, respectively. , The upper panel 3 on the outer air side arranged on the lower panel 1 on the outer air side, the upper panel 4 on the inner air side arranged on the lower panel 2 on the inner air side, and the outer air side. It was formed by placing cast-in-place concrete M in the first cast-in-place concrete arrangement space s1, which is the cast-in-place concrete arrangement space provided between the lower panel 1 and the lower panel 2 on the inner air side. A second cast-in-place concrete arrangement space provided between the first cast-in-place plate component g1 which is a cast-in-place wall body component and the upper panel 3 on the outer air side and the upper panel 4 on the inner air side. It is provided with a second cast-in-place slab component g2 formed by casting cast-in-place concrete M in s2.

<Lower panel 1 on the outside air side>
The lower panel 1 on the outer air side is made of precast concrete having a substantially rectangular plate shape, as shown in detail in FIGS. 5 and 6. The lower panel 1 on the outer air side is located on the outer air side of the box culvert A.

The inner side surface nm of the lower panel 1 on the outer air side, that is, the side surface facing the first cast-in-place concrete arrangement space s1 (first cast-in-place side slab component g1), and the four edge end faces, that is, the front end face zm. The rear end surface km, the upper end surface jm, and the lower end surface um are subjected to a joint treatment (roughening treatment) in which an uneven shape based on an aggregate or the like is exposed on the outer surface.

Inside the lower panel 1 on the outer air side, a plurality of force distribution bars t1 extending in the horizontal direction are provided, and a plurality of main bars t2 extending in the vertical direction are provided.

At the lower end of the lower panel 1 on the outer air side, a plurality of tubular mortar-filled joints tz open downward are embedded at intervals. Inside the mortar-filled joint tz arranged on the lower panel 1 on the outer air side, the outer connecting reinforcing bar v1 erected on the bottom slab B is located.

On the lower panel 1 on the outer air side, a plurality of outer connecting reinforcing bars v1 protruding upward from the upper end surface are erected at intervals. The outer connecting reinforcing bar v1 erected on the lower panel 1 on the outer air side is located inside the mortar filling type joint tz provided on the upper panel 3 on the outer air side.

The lower panel 1 on the outer air side is provided with a plurality of reinforcing steel materials h that are cantileveredly supported by the lower panel 1 on the outer air side. The plurality of reinforcing steel materials h cantileverly project into the lower panel 2 side on the inner air side to be arranged facing each other, that is, the first cast-in-place concrete arrangement space s1 (inside the first cast-in-place slab component g1). It was done. The tip of the reinforcing steel material h has a shape bent in a substantially U shape.

<Lower panel 2 on the inner sky side>
The lower panel 2 on the inner air side is made of precast concrete having a substantially rectangular plate shape, as shown in detail in FIGS. 5 and 6. The lower panel 2 on the inner air side is located on the inner air side of the box culvert A, that is, on the inner space sp side.

The inner side surface nm of the lower panel 2 on the inner air side, that is, the side surface facing the first cast-in-place concrete arrangement space s1 (first cast-in-place side slab component g1), and the four edge end faces, that is, the front end face zm. The rear end surface km, the upper end surface jm, and the lower end surface um are subjected to a joint treatment (roughening treatment) in which an uneven shape based on an aggregate or the like is exposed on the outer surface.

Inside the lower panel 2 on the inner air side, a plurality of force distribution bars t1 extending in the horizontal direction are provided, and a plurality of main bars t2 extending in the vertical direction are provided.

At the lower end of the lower panel 2 on the inner air side, a plurality of tubular mortar-filled joints tz open downward are embedded at intervals. Inside the mortar-filled joint tz arranged on the lower panel 2 on the inner air side, the inner connecting reinforcing bar v2 erected on the bottom slab B is located.

On the lower panel 2 on the inner air side, a plurality of inner connecting reinforcing bars v2 protruding upward from the upper end surface are erected at intervals. The inner connecting reinforcing bar v2 erected on the lower panel 2 on the inner air side is located inside the mortar filling type joint tz provided on the upper panel 4 on the inner air side.

The lower panel 2 on the inner air side is provided with a plurality of reinforcing steel materials h that are cantileveredly supported by the lower panel 2 on the inner air side. The plurality of reinforcing steel materials h cantileverly project into the lower panel 1 side on the outer air side to be arranged facing each other, that is, the first cast-in-place concrete arrangement space s1 (inside the first cast-in-place slab component g1). It was done. The tip of the reinforcing steel material h has a shape bent in a substantially U shape.

<Interrelationship between the lower panels 1 and 2 on the opposite outer air side and inner air side>
The lower panels 1 and 2 on the outer air side and the inner air side, which are arranged facing each other via the first cast-in-place concrete arrangement space s1 (first cast-in-place side plate component g1), are set to substantially the same size. Has been done.

The lower panels 1 and 2 on the outer air side and the inner air side are arranged in an upright posture and substantially parallel to each other. Further, the lower end surface um of the lower panel 1 on the outer air side and the lower end surface um of the lower panel 2 on the inner air side are set to substantially the same horizontal position. In other words, the lower end surfaces um of the lower panels 1 and 2 on the outer air side and the inner air side are set at substantially the same height position.

The first cast-in-place concrete arrangement space s1 is formed between the lower panels 1 and 2 on the outer air side and the inner air side. In other words, a first cast-in-place concrete arrangement space s1 communicating in the vertical direction and the front-rear direction is formed between the lower panels 1 and 2 on the outer air side and the inner air side. After the cast-in-place concrete M is placed in the first cast-in-place concrete arrangement space s1, the region constitutes the first cast-in-place slab component g1.

<Upper panel 3 on the outside sky side>
Since the upper panel 3 on the outer air side has the same structure as the lower panel 1 on the inner air side, it will be described with reference to FIGS. 5 and 6, and the reference numerals relating to the internal structure will be described with a common reference numeral. To do.

The upper panel 3 on the outer air side is made of precast concrete having a substantially rectangular plate shape, as shown in detail in FIGS. 5 and 6. The upper panel 3 on the outer air side is located on the outer air side of the box culvert A.

The inner side surface nm of the upper panel 3 on the outer air side, that is, the side surface facing the second cast-in-place concrete arrangement space s2 (second cast-in-place side slab component g2) side, and the four edge end faces, that is, the front end face zm. The rear end surface km, the upper end surface jm, and the lower end surface um are subjected to a joint treatment (roughening treatment) in which an uneven shape based on an aggregate or the like is exposed on the outer surface.

Inside the upper panel 3 on the outer air side, a plurality of force distribution bars t1 extending in the horizontal direction are provided, and a plurality of main bars t2 extending in the vertical direction are provided.

At the lower end of the upper panel 3 on the outer air side, a plurality of tubular mortar-filled joints tz open downward are embedded at intervals. Inside the mortar-filled joint tz arranged on the upper panel 3 on the outer air side, the outer connecting reinforcing bar v1 erected on the lower panel 1 on the outer air side is located.

On the upper panel 3 on the outer air side, a plurality of outer connecting reinforcing bars v1 protruding upward from the upper end surface are erected at intervals. The outer connecting reinforcing bar v1 erected on the upper panel 3 on the outer air side is located inside the mortar filling type joint tz provided on the top plate panel 5.

The upper panel 3 on the outer air side is provided with a plurality of reinforcing steel materials h that are cantileveredly supported by the upper panel 3 on the outer air side. The plurality of reinforcing steel materials h cantileverly project into the upper panel 4 side on the inner air side to be arranged facing each other, that is, the second cast-in-place concrete arrangement space s2 (inside the second cast-in-place slab component g2). It was done. The tip of the reinforcing steel material h has a shape bent in a substantially U shape.

<Upper panel 4 on the inner sky side>
Since the upper panel 4 on the inner air side has the same structure as the lower panel 2 on the inner air side, it will be described with reference to FIGS. 5 and 6, and the reference numerals relating to the internal structure will be described with a common reference numeral. To do.

The upper panel 4 on the inner air side is made of precast concrete having a substantially rectangular plate shape, as shown in detail in FIGS. 5 and 6. The upper panel 4 on the inner air side is located on the inner air side of the box culvert A, that is, on the inner space sp side.

The inner side surface nm of the upper panel 4 on the inner air side, that is, the side surface facing the second cast-in-place concrete arrangement space s2 (second cast-in-place side slab component g2) side, and the four edge end faces, that is, the front end face zm. The rear end surface km, the upper end surface jm, and the lower end surface um are subjected to a joint treatment (roughening treatment) in which an uneven shape based on an aggregate or the like is exposed on the outer surface.

Inside the upper panel 4 on the inner air side, a plurality of force distribution bars t1 extending in the horizontal direction are provided, and a plurality of main bars t2 extending in the vertical direction are provided.

At the lower end of the upper panel 4 on the inner air side, a plurality of tubular mortar-filled joints tz open downward are embedded at intervals. Inside the mortar-filled joint tz arranged on the upper panel 4 on the inner air side, the inner connecting reinforcing bar v2 erected on the lower panel 2 on the inner air side is located.

In the upper panel 4 on the inner air side, a plurality of inner connecting reinforcing bars v2 protruding upward from the upper end surface are erected at intervals. The inner connecting reinforcing bar v2 erected on the upper panel 4 on the inner air side is located inside the mortar filling type joint tz provided in the top plate block 6.

The upper panel 4 on the inner air side is provided with a plurality of reinforcing steel materials h that are cantileveredly supported by the upper panel 4 on the inner air side. The plurality of reinforcing steel materials h cantileverly project into the upper panel 3 side on the outer air side to be arranged facing each other, that is, the second cast-in-place concrete arrangement space s2 (inside the second cast-in-place slab component g2). It was done. The tip of the reinforcing steel material h has a shape bent in a substantially U shape.

<About the interrelationship of the upper panels 3 and 4 on the outer and inner air sides facing each other>
The upper panels 3 and 4 on the outer air side and the inner air side, which are arranged to face each other via the second cast-in-place concrete arrangement space s2 (second cast-in-place side plate component g2), are set to substantially the same size. Has been done.

The upper panels 3 and 4 on the outer air side and the inner air side are arranged in an upright posture and substantially parallel to each other. Further, the lower end surface um which is the lower end edge of the upper panel 3 on the outer air side and the lower end surface um which is the lower end edge of the upper panel 4 on the inner air side are set to substantially the same horizontal position. In other words, the lower end surfaces um of the upper panels 3 and 4 on the outer air side and the inner air side are set at substantially the same height position.

The second cast-in-place concrete arrangement space s2 is formed between the upper panels 3 and 4 on the outer air side and the inner air side. In other words, a second cast-in-place concrete arrangement space s2 that communicates in the vertical direction and the front-rear direction is formed between the upper panels 3 and 4 on the outer air side and the inner air side. After the cast-in-place concrete M is placed in the second cast-in-place concrete arrangement space s2, the region constitutes the second cast-in-place slab component g2.

<< Top Edition D >>
The top plate D is mounted on the top plate panel 5 mounted on the upper panel 3 on the outer air side which constitutes the left and right side plates C, and on the upper panel 4 on the inner air side which constitutes the left and right side plates C. On-site casting for the top plate formed between the attached top plate block 6 and the upper side of the top plate block 6, between the top plate block 6 and the top plate panel 5, and between the top plate panels 5 arranged to face each other. It is provided with a cast-in-place top plate component g3 formed by placing cast-in-place concrete M in the concrete arrangement space s3.

<Top plate panel 5>
As shown in FIGS. 16 to 17, the top plate panel 5 is made of precast concrete having a substantially rectangular plate shape. The top plate panel 5 is located on the outer air side of the box culvert A.

The inner side surface of the top plate panel 5, that is, the side surface facing the cast-in-place concrete arrangement space s3 side for the top plate, and the three edge end faces, that is, the front end face, the rear end face, and the lower end face, have an uneven shape based on an aggregate or the like. A joint treatment (roughening treatment) is applied to the outer surface.

Since the internal structure of the top plate panel 5 has the same structure as that of the lower panel 1 on the outer air side (see FIGS. 5 and 6), the illustration is omitted.

That is, inside the top plate panel 5, a plurality of force distribution bars (not shown) extending in the horizontal direction are provided, and a plurality of main bars (not shown) extending in the vertical direction are provided. .. The upper part of the top plate panel 5 has a plurality of horizontal main bars t21 that are cantileveredly supported by the top plate panel 5. The main bar (not shown) extending in the vertical direction and the horizontal main bar t21 are integrally continuous. The horizontal main bar t21 projects toward the cast-in-place concrete arrangement space s3 for the top slab. Further, at the lower end portion of the top plate panel 5, a plurality of tubular mortar-filled joints tz open downward are embedded at intervals. Inside the mortar-filled joint tz arranged on the top plate panel 5, the outer connecting reinforcing bar v1 erected on the upper panel 3 on the outer air side is located.

A plurality of reinforcing steel materials h that are cantilevered by the top plate panel 5 are provided below the top plate panel 5. The plurality of reinforcing steel materials h are cantilevered in the cast-in-place concrete arrangement space s3 for the top slab (inside the cast-in-place top plate component g3).

<Top plate block 6>
The top plate block 6 is made of precast concrete in the shape of a horizontally long block. The top plate block 6 includes left and right upright portions 61 that are erected on the upper panels 4 on the inner air side arranged on the left and right, and horizontal portions 62 that connect the upper ends of the left and right upright portions 61. It has a downward U-shape. The top plate block 6 is located on the inner air side of the box culvert A, that is, on the inner space sp side.

The front-rear dimension of the top plate block 6 is set shorter than the front-rear dimension of the top plate panel 5 and other panels in consideration of the weight that can be conveyed and the like.

The surface of the top plate block 6 facing the cast-in-place concrete arrangement space s3 (cast-in-place top plate component g3) side, and the three edge end faces, that is, the front end face, the rear end face, and the lower end face of the standing portion. Is subjected to a joint treatment (roughening treatment) in which an uneven shape based on an aggregate or the like is exposed on the outer surface.

Since the internal structure of the upright portion 61 has the same structure as that of the lower panel 1 (see FIGS. 5 and 6) on the outer air side, the illustration is omitted.

That is, inside the standing portion 61, a plurality of force distribution bars (not shown) extending in the horizontal direction and a plurality of main bars (not shown) extending in the vertical direction are provided. Further, a plurality of tubular mortar-filled joints tz open downward are embedded at the lower end of the upright portion 61 at intervals. The inner connecting reinforcing bar v2 erected on the upper panel 4 on the inner air side is located in the mortar-filled joint tz arranged in the upright portion 61.

The upright portion 61 is provided with a plurality of reinforcing steel materials h that are cantileveredly supported by the upright portion 61. The plurality of reinforcing steel materials h extend substantially horizontally toward the top plate panel 5 side. The tip of the reinforcing steel material h has a shape bent in a substantially U shape.

Inside the horizontal portion 62, a plurality of force distribution bars (not shown) extending in the front-rear and horizontal directions are provided. Further, the horizontal portion 62 is provided with a plurality of main bars t23 extending in the left-right direction and having both ends protruding into the cast-in-place concrete arrangement space s3 (cast-in-place top plate component g3) for the top plate, and at the same time, the PC Prestress using steel material is applied. A plurality of reinforcing steel materials h are erected upward in the horizontal portion 62. The tip portions of the plurality of reinforcing steel materials h erected on the horizontal portion 62 have a substantially U-shaped curved shape.

At the corner portion 63, which is the boundary portion between the upright portion 61 and the horizontal portion 62, the upper end portion side and the lower end portion side are inclined so as to project into the cast-in-place concrete arrangement space s3 (cast-in-place top plate component g3) for the top plate. Reinforcing bar ks is buried.

<Gap between adjacent members (horizontal gap YS)>
As shown in detail in FIGS. 3 and 4, the box culvert A has a plurality of lower panels 1 on the outside air side arranged side by side in the front-rear direction, which is the direction in which the internal space sp of the box culvert A communicates. A plurality of lower panels 2 on the inner air side are arranged side by side in the front-rear direction.

The adjacent lower panels 1 and 1 on the outer air side are arranged via a lateral gap YS of about 10 cm, and the adjacent lower panels 2 and 2 on the inner air side are arranged via a lateral gap YS of about 10 cm. Are arranged. Cast-in-place concrete M is placed in the lateral gap YS. In other words, the box culvert A is provided with a gap casting portion by hardening the cast-in-place concrete M filled in the lateral gap YS between the adjacent lower panels 1 and 1 on the outer air side. A gap casting portion is provided by hardening the cast-in-place concrete M filled in the lateral gap YS between the lower panels 2 and 2 on the inner air side that meet each other.

Further, similarly to the lower panels 1 and 2 on the outer air side and the inner air side, in the box culvert A, a plurality of upper panels 3 on the outer air side are arranged side by side in the front-rear direction, and the plurality of inner air sides are arranged. The upper panels 4 are arranged side by side in the front-rear direction. The adjacent upper panels 3 and 3 on the outer air side are arranged via a lateral gap YS of about 10 cm, and the adjacent upper panels 4 and 4 on the inner air side are arranged via a lateral gap YS of about 10 cm. Are arranged. Cast-in-place concrete M is placed in the lateral gap YS. In other words, the box culvert A is provided with a gap casting portion by hardening the cast-in-place concrete M filled in the lateral gap YS between the adjacent upper panels 3 and 3 on the outer air side. A gap casting portion is provided by hardening the cast-in-place concrete M filled in the lateral gap YS between the upper panels 4 and 4 on the inner air side to be matched.

Further, similarly to the lower panels 1 and 2 on the outer air side and the inner air side, in the box culvert A, a plurality of top plate panels 5 are arranged side by side in the front-rear direction, and a plurality of top plate blocks 6 are arranged in the front-rear direction. They are placed next to each other. The adjacent top plate panels 5 and 5 are arranged via a lateral gap YS of about 10 cm, and the adjacent top plate blocks 6 and 6 are arranged via a lateral gap YS of about 10 cm. Cast-in-place concrete M is placed in the lateral gap YS. In other words, the box culvert A is provided with a gap casting portion by hardening the cast-in-place concrete M filled in the lateral gap YS between the adjacent top plates 5 and 5, and the adjacent top plates are provided. A gap casting portion is provided by hardening the cast-in-place concrete M filled in the lateral gap YS between the blocks 6 and 6.

The lateral gap YS between the panels adjacent to each other in the front-rear direction, which is a constituent member of the side plate C, has a size that allows the temporary holding member K detached from each panel to pass through in the temporary holding member detaching step w24 described in detail later. It is set to.

Needless to say, the lateral clearance YS is not limited to a size of about 10 cm. The size of the lateral gap YS is not strictly specified, but it is desirable to set it within the range of 5 to 25 cm. If the size of the lateral gap YS is within the range of 5 to 25 cm, work by a field worker using hands (for example, work of removing the temporary holding member K from each panel through the lateral gap YS, or lateral The work of moving the temporary holding member K through the directional gap YS, the work of installing the external force distribution bar p performed through the lateral gap YS, etc.) can be performed without difficulty, and each panel is cast on-site concrete M. It can function suitably as the main mold of the above.

<Regarding the gap between the members arranged above and below (vertical gap TS)>
The bottom slab B and the lower panel 1 on the outer air side, and the bottom slab B and the lower panel 2 on the inner air side are arranged with a vertical gap TS of about 2 cm in the vertical direction. Specifically, a plate-shaped spacer ma having a thickness of about 2 cm is arranged between the bottom plate B and the lower panel 1 on the outer air side, and between the bottom plate B and the lower panel 2 on the inner air side. By doing so, a vertical gap TS of about 2 cm is provided between the upper surface of the bottom slab B and the lower surface of the lower panel 1 on the outer air side, and between the upper surface of the bottom slab B and the lower surface of the lower panel 2 on the inner air side. Is provided.

The integration of the bottom slab B and the lower panel 1 on the outer air side and the integration of the bottom slab B and the lower panel 2 on the inner air side are performed by connecting the outer and inner connecting reinforcing bars v1 and v2 erected on the bottom slab B. This is performed by arranging the non-shrink mortar in the mortar-filled joint tz provided on the lower panels 1 and 2 on the outer air side and the inner air side, and then filling the mortar-filled joint tz. Further, the non-shrink mortar is also filled in the vertical gap TS between the upper surface of the bottom plate B and the lower surfaces of the lower panels 1 and 2 on the outer air side and the inner air side in a state where leakage to the outside is prevented. There is. In other words, a non-shrink mortar is placed in the vertical gap TS between the bottom slab B and the lower panels 1 and 2 on the outer air side and the inner air side.

The lower panels 1 and 2 on the outer air side and the inner air side and the upper panels 3 and 4 on the outer air side and the inner air side are arranged with a vertical gap TS of about 2 cm in the vertical direction. Specifically, a plate-shaped spacer ma having a thickness of about 2 cm is provided between the lower panels 1 and 2 on the outer air side and the inner air side and the upper panels 3 and 4 on the outer air side and the inner air side. Are arranged. As a result, a vertical gap TS of about 2 cm is formed between the upper surfaces of the lower panels 1 and 2 on the outer air side and the inner air side and the lower surfaces of the upper panels 3 and 4 on the outer air side and the inner air side. There is.

The integration of the lower panels 1 and 2 on the outer air side and the inner air side with the upper panels 3 and 4 on the outer air side and the inner air side is erected on the lower panels 1 and 2 on the outer air side and the inner air side. The outer and inner connecting reinforcing bars v1 and v2 are arranged in the mortar-filled joint tz provided on the upper panels 3 and 4 on the outer and inner air sides, and the non-shrink mortar is placed in the mortar-filled joint tz. It is done by filling in. Further, the non-shrink mortar is formed on the upper surfaces of the lower panels 1 and 2 on the outer air side and the inner air side and the lower surfaces of the upper panels 3 and 4 on the outer air side and the inner air side in a state where leakage to the outside is prevented. The vertical gap TS between them is also filled. In other words, non-shrink mortar is placed in the vertical gap TS between the lower panels 1 and 2 on the outer air side and the inner air side and the upper panels 3 and 4 on the outer air side and the inner air side. ..

The upper panel 3 and the top plate panel 5 on the outer air side are arranged with a vertical gap TS of about 2 cm in the vertical direction, and the upper panel 4 and the top plate block 6 on the inner air side are arranged in the vertical direction. It is arranged with a vertical gap TS of about 2 cm. Specifically, a plate shape having a thickness of about 2 cm is provided between the upper panel 3 on the outer air side and the top plate panel 5, and between the upper panel 4 on the inner air side and the top plate block 6. Spacer ma is arranged. As a result, a vertical gap TS of about 2 cm is formed between the upper panel 3 on the outer air side and the top plate panel 5, and between the upper panel 4 on the inner air side and the top plate block 6. There is.

The integration of the upper panel 3 on the outer air side and the top plate panel 5 and the integration of the upper panel 4 on the inner air side and the top plate block 6 are performed on the upper panel 3 and the top plate panel 5 on the outer air side. The erected outer and inner connecting reinforcing bars v1 and v2 are arranged in the mortar-filled joint tz provided on the top plate panel 5 and the top plate block 6, and then the non-shrink mortar is placed in the mortar-filled joint tz. It is done by filling. Further, the non-shrink mortar has a vertical gap TS between the upper surface of the upper panel 3 on the outer air side and the lower surface of the top plate panel 5 and the upper panel 4 on the inner air side in a state where leakage to the outside is prevented. The vertical gap TS between the upper surface and the lower surface of the top plate block 6 is also filled. In other words, there is no vertical gap TS between the upper panel 3 on the outer air side and the top plate panel 5, and the vertical gap TS between the upper panel 4 on the inner air side and the top plate block 6. Shrink mortar has been placed.

<< How to build Box Culvert A >>
Subsequently, a method of constructing the box culvert A will be described.

The method for constructing the box culvert A includes a step W1 for forming the bottom plate B, a step W2 for forming the side plate C, and a step W3 for forming the top plate D.

<Step W1 for forming bottom plate B>
As shown in FIG. 7, the step W1 for forming the bottom slab B includes a bottom slab placing step W11 for placing cast-in-place concrete in a formwork (not shown) at a predetermined position on the foundation E. The bottom slab B has an outer connecting reinforcing bar v1 and an inner connecting reinforcing bar v2 projecting at predetermined positions.

<Step W2 for forming side plate C>
In the step W2 for forming the side plate C, the lower panel unit U1 is manufactured so that the lower panels 1 and 2 on the outer air side and the inner air side can be integrally conveyed together with the temporary holding member K. Upper panel unit manufacturing process w22 for manufacturing the upper panel unit U2 in which the panel unit manufacturing process w21 and the upper panels 3 and 4 on the outer air side and the inner air side can be integrally conveyed together with the temporary holding member K. After passing through the lower panel unit transport installation step w23 and the lower panel unit transport installation step w23 for transporting and installing the lower panel unit U1 to a predetermined position on the bottom plate B, the temporary holding member K is moved to the outer air side and the inner side. After passing through the first temporary holding member detaching step w24 for detaching from the lower panels 1 and 2 on the empty side and the lower panel unit transport installation step w23, the upper panel unit U2 is moved to the lower panel 1 on the outer air side and the inner air side. After passing through the upper panel unit transport installation step w25 and the upper panel unit transport installation step w25, the temporary holding member K is separated from the upper panels 3 and 4 on the outer air side and the inner air side. After passing through the second temporary holding member detaching step w26 and the temporary holding member detaching step w26, the side slab placing step of placing the cast-in-place concrete M in the first and second cast-in-place concrete arrangement spaces s1 and s2. It is equipped with w27.

(Lower / upper panel unit manufacturing process w21, w22)
As shown in FIGS. 5 and 6, the lower and upper panel units U1 and U2 manufactured in the lower panel unit manufacturing process w21 and the upper panel unit manufacturing process w22 have the same configuration. By doing so, it is possible to save the trouble of separately managing the lower panel unit U1 and the upper panel unit U2 and selecting them at the time of construction, and it is possible to smoothly construct the side plate C. ing.

The lower and upper panel units U1 and U2 are temporarily configured before the completion of the box culvert A. That is, the lower and upper panel units U1 and U2 are configured in a place (for example, a factory) different from the site where the box culvert A is constructed. The configurations of the lower and upper panel units U1 and U2 are solved by removing the temporary holding member K at the stage of constructing the box culvert A at the site.

The lower and upper panel units U1 and U2 can be transported to the site where the box culvert A is constructed and installed at a predetermined position capable of forming the side plate C in a united mode. It has become.

The lower panel unit U1 is formed by connecting a lower panel 1 on the outer air side and a lower panel 2 on the inner air side, which are arranged apart from each other, by a temporary holding member K. The lower panel unit U1 uses a jig (not shown) to determine the relative positions of the lower panel 1 on the outer air side and the lower panel 2 on the inner air side, and then the lower panel 1 on the outer air side and the inner sky. It is manufactured by connecting the lower panel 2 on the side with a temporary holding member K.

The lower panel 1 on the outer air side and the lower panel 2 on the inner air side are regulated so as not to be separated from each other by using a known separator or the like (not shown) that does not bear a shearing force. ..

The detailed configurations of the lower panel 1 on the outer air side and the lower panel 2 on the inner air side have already been described and will be omitted.

One end of the temporary holding member K is attached to the front end surface zm which is one end surface of the lower panel 1 on the outer air side by using bolts L, and the other end is the front end surface zm which is one end surface of the lower panel 2 on the inner air side. The first steel material k1, which is a member to be attached using bolts L, and the rear end surface km, one end of which is the other end surface of the lower panel 1 on the outer air side, are attached using bolts (not shown) and others. It is composed of a second steel material k2 whose end is attached to the rear end surface km, which is the other end surface of the lower panel 2 on the inner air side, by using a bolt (not shown).

In this embodiment, one end of the first steel material k1 is screwed to the upper part of the front end surface zm of the lower panel 1 on the outer air side, and the other end is screwed to the lower part of the front end surface zm of the lower panel 2 on the inner air side. It is screwed. In other words, the first steel material k1 is attached to the lower panels 1 and 2 on the outer air side and the inner air side in an inclined posture with respect to the horizontal.

Further, one end of the second steel material k2 is screwed to the lower part of the rear end surface km of the lower panel 1 on the outer air side, and the other end is screwed to the upper part of the rear end surface km of the lower panel 2 on the inner air side. ing. In other words, the second steel material k2 is attached to the lower panels 1 and 2 on the outer air side and the inner air side in an inclined posture with respect to the horizontal.

The upper panel unit U2 is formed by connecting the upper panel 3 on the outer air side and the upper panel 4 on the inner air side, which are arranged apart from each other, by a temporary holding member K. The upper panel unit U2 uses a jig (not shown) to determine the relative positions of the upper panel 3 on the outer air side and the upper panel 4 on the inner air side, and then the upper panel 3 on the outer air side and the inner sky. It is manufactured by connecting the upper panel 4 on the side with a temporary holding member K.

The upper panel 3 on the outer air side and the upper panel 4 on the inner air side are regulated so as not to be separated from each other by using a known separator or the like (not shown) that does not bear a shearing force. ..

Since the detailed configuration of the upper panel 3 on the outer air side and the upper panel 4 on the inner air side has already been described, the detailed configurations thereof will be omitted.

One end of the temporary holding member K is attached to the front end surface zm which is one end surface of the upper panel 3 on the outer air side by using bolts L, and the other end is the front end surface zm which is one end surface of the upper panel 4 on the inner air side. The first steel material k1, which is a member to be attached using bolts L, and the rear end surface km, one end of which is the other end surface of the upper panel 3 on the outer air side, are attached using bolts (not shown) and others. It is composed of a second steel material k2 whose end is attached to the rear end surface km, which is the other end surface of the upper panel 4 on the inner air side, by using a bolt (not shown).

In this embodiment, one end of the first steel material k1 is screwed to the upper part of the front end surface zm of the upper panel 3 on the outer air side, and the other end is screwed to the lower part of the front end surface zm of the upper panel 4 on the inner air side. It is screwed. In other words, the first steel material k1 is attached to the upper panels 3 and 4 on the outer air side and the inner air side in an inclined posture with respect to the horizontal.

Further, one end of the second steel material k2 is screwed to the lower part of the rear end surface km of the upper panel 3 on the outer air side, and the other end is screwed to the upper part of the rear end surface km of the upper panel 4 on the inner air side. ing. In other words, the second steel material k2 is attached to the upper panels 3 and 4 on the outer air side and the inner air side in an inclined posture with respect to the horizontal.

In this embodiment, the temporary holding member K used for constructing the lower panel unit U1 and the upper panel unit U2 has the same structure. More specifically, as the first and second steel materials k1 and k2 which are the temporary holding members K, L-shaped steel having bolt insertion holes a formed at both ends through which bolts L can be inserted is applied. The bolt insertion hole a may be a round hole or a long hole.

(Lower panel unit transport installation process w23)
As shown in FIG. 8, the lower panel unit transport / installation step w23 transports and installs the lower panel unit U1 at a predetermined position on the bottom plate B by using a transport means ID such as a crane. The lower panel unit U1 is conveyed and installed so that the outer and inner connecting reinforcing bars v1 and v2 erected on the bottom slab B are inserted into the mortar-filled joint tz provided in the lower panel unit U1. To.

The lower panel unit U1 can be suspended and supported by the transport means ID by an appropriate method. In this embodiment, hooks f to which the wires constituting the transport means ID can be connected are provided on the inner surfaces of the lower panels 1 and 2 on the outer air side and the inner air side.

The lower panel unit transport installation step w23 includes a step of arranging a plurality of lower panel units U1 side by side in the front-rear direction.

That is, in the step of arranging a plurality of lower panel units U1 in the front-rear direction, the plurality of lower panel units U1 are placed between the end faces of the adjacent lower panels 1 on the outer air side and the lower panels 2 on the adjacent inner air side. It is arranged in the front-rear direction so that a lateral gap YS having a width dimension through which the temporary holding member K can pass is formed between the end faces of the above.

Further, in the lower panel unit transport installation step w23, as shown in FIG. 9, the step of integrating the bottom slab B and the lower panel 1 on the outer air side and the bottom slab B and the lower panel 2 on the inner air side are integrated. Includes the process of converting.

That is, the step of integrating the bottom slab B with the lower panels 1 and 2 on the outer air side and the inner air side is performed by filling the mortar filling type joint tz with non-shrink mortar using the filling device JS. In this step, the non-shrink mortar is introduced into the mortar-filled joint tz through a communication passage tr that communicates the outside with the mortar-filled joint tz. The non-shrink mortar is also filled in the vertical gap TS between the upper surface of the bottom slab B and the lower end surfaces um of the lower panels 1 and 2 on the outer air side and the inner air side in a state where leakage to the outside is prevented. .. In other words, in the box culvert A, the main bar t2 in the vertical direction is integrated by hardening the non-shrink mortar in the mortar filling type joint tz, and the bottom slab B adjacent to the vertical direction and the outer air side and the inner air side are integrated. The bottom slab B and the lower panels 1 and 2 on the outer air side and the inner air side are integrated by hardening the non-shrink mortar filled in the vertical gap TS between the lower panels 1 and 2.

(First temporary holding member detaching step w24)
As shown in FIG. 10, in the first temporary holding member detaching step w24, which is the temporary holding member detaching step, the temporary holding member K is placed on the lower panel on the outer air side and the inner air side after passing through the lower panel unit transport installation step w23. It is a departure from 1 and 2. The first temporary holding member detaching step w24 can be manually performed by a field worker through the lateral gap YS.

That is, the field worker passes his / her hand through the lateral gap YS and removes the bolt L from the lower panels 1 and 2 on the outer air side and the inner air side to detach the temporary holding member K to the outside through the lateral gap YS. I am trying to do it. The detached temporary holding member K is transported to a factory or the like and reused for manufacturing another panel unit.

Further, in the first temporary holding member detaching step w24, as shown in FIG. 10, a plurality of external force distributions that vertically traverse the cast-in-place concrete arrangement spaces s1 and s1 of the lower panel units U1 adjacent to each other in the front-rear direction. It includes a step of arranging the muscle p. This step is performed after the temporary holding member K is removed from the lower panels 1 and 2 on the outer air side and the inner air side.

The external force distribution muscle p extends linearly in the front-rear direction. A plurality of external force distribution bars p are arranged along the inner side surfaces nm and nm of the lower panels 1 on the outer air side adjacent to each other in the front-rear direction, and the lower panels 2 on the inner air side adjacent to each other in the front-rear direction. A plurality of lines are arranged along the inner surfaces nm and nm.

A plurality of external force distribution bars p are arranged at positions vertically traversing between the lower panel units U1 adjacent to each other in the front-rear direction. In other words, the external force distribution bar p is the space on one side adjacent to each other in the front-rear direction, that is, the first cast-in-place concrete arrangement space s1 between the lower panels 1 and 2 on the outer and inner air sides that form a pair. It is arranged so as to communicate with the space on the other side adjacent to each other, that is, the first cast-in-place concrete arrangement space s1 between the lower panels 1 and 2 on the outer air side and the inner air side which form a pair.

In this embodiment, the external force distribution muscles p are inserted from the front side or the back side of the lower panel units U1 arranged in the gable side (edge side), that is, in the front-rear direction, and are on the outer air side and the inner air side. It is placed on the reinforcing steel material h projecting from the lower panels 1 and 2.

The work of adjusting the arrangement location of the external force distribution bar p and the work of temporarily fixing the external force distribution bar p and the reinforcing steel material h is performed through the lateral gap YS provided between the lower panel units U1 where the field workers are adjacent to each other. It can be done manually.

The external force distribution bar p is configured by removing the temporary holding member K from the lower panel unit main component U11 (lower panel unit U1) arranged adjacent to each other in the front-rear direction by passing through the side plate placing step w27. The part) can be substantially connected. In other words, the lower panel unit main constituent parts U11 arranged side by side in the front-rear direction are cast in the first place where the external force distribution bars p are communicated with the first cast-in-place concrete arrangement spaces s1 and s1. When the concrete M is hardened, it is firmly integrated.

(Upper panel unit transfer installation process w25)
In the upper panel unit transport installation step w25, as shown in FIG. 11, the upper panel unit U2 is changed to the lower panel unit U1 (or the lower panel unit main component U11) by using the transport means ID of a crane or the like. It is to be transported and installed on top. The upper panel unit U2 has outer and inner connecting reinforcing bars v1 which are erected on the lower panels 1 and 2 on the outer air side and the inner air side in the mortar filling type joint tz provided in the upper panel unit U2. It is transported and installed so that v2 is inserted.

Other explanations regarding the upper panel unit transport installation step w25 (a step of arranging a plurality of upper panel units U2 side by side in the front-rear direction, lower panels 1 and 2 on the outer air side and the inner air side, and the outer air side). And the step of integrating the upper panels 3 and 4 on the inner air side) are basically the same as the lower panel unit transport installation step w23, and thus the description thereof will be omitted.

(Second temporary holding member detaching step w26)
In the second temporary holding member detaching step w26, as shown in FIG. 12, the temporary holding member K is detached from the upper panels 3 and 4 on the outer air side and the inner air side after passing through the upper panel unit transport installation step w25. It is a thing. The second temporary holding member detaching step w26 can be manually performed by a field worker through the lateral gap YS.

That is, the field worker passes his / her hand through the lateral gap YS and removes the bolt L from the upper panels 3 and 4 on the outer air side and the inner air side to detach the temporary holding member K to the outside through the lateral gap YS. I am trying to do it. The detached temporary holding member K is transported to a factory or the like and reused for manufacturing another panel unit.

Further, in the second temporary holding member detaching step w26, as shown in FIG. 12, a plurality of external force distributions that vertically traverse the cast-in-place concrete arrangement spaces s2 and s2 of the upper panel units U2 adjacent to each other in the front-rear direction. It includes a step of arranging the muscle p. This step is performed after the temporary holding member K is removed from the upper panels 3 and 4 on the outer air side and the inner air side.

The external force distribution muscle p extends linearly in the front-rear direction. A plurality of external force distribution bars p are arranged along the inner side surfaces nm and nm of the upper panels 3 on the outer air side adjacent to each other in the front-rear direction, and the upper panels 4 on the inner air side adjacent to each other in the front-rear direction. A plurality of lines are arranged along the inner surfaces nm and nm.

A plurality of external force distribution bars p are arranged at positions vertically traversing between the upper panel units U2 adjacent to each other in the front-rear direction. In other words, the external force distribution bar p is a space on one side adjacent to each other in the front-rear direction, that is, a second cast-in-place concrete arrangement space s2 between the upper panels 3 and 4 on the outer and inner air sides that form a pair. It is arranged so as to communicate with the space on the other side adjacent to each other, that is, the second cast-in-place concrete arrangement space s2 between the upper panels 3 and 4 on the outer air side and the inner air side which form a pair.

In this embodiment, the external force distribution muscles p are inserted from the front side or the back side of the upper panel units U2 arranged in the gable side (edge side), that is, in the front-rear direction, and are on the outer air side and the inner air side. It is placed on the reinforcing steel material h projecting from the upper panels 3 and 4.

The work of adjusting the arrangement location of the external force distribution bar p and the work of temporarily fixing the external force distribution bar p and the reinforcing steel material h is performed through the lateral gap YS provided between the upper panel units U2 where the field workers are adjacent to each other. It can be done manually.

The external force distribution bar p has a configuration in which the upper panel unit main component U21 (the upper panel unit U2 excluding the temporary holding member K) is arranged adjacent to each other in the front-rear direction by passing through the side plate placing step w27. The part) can be substantially connected. In other words, the upper panel unit main constituents U21 arranged side by side in the front-rear direction are cast in the second cast-in-place concrete arrangement space s2, s2 with the external force distribution bar p communicating with each other. When the concrete M is hardened, it is firmly integrated.

(Side plate placing process w27)
In the side slab placing step w27, after passing through the first and second temporary holding member detaching steps w24 and w26, the cast-in-place concrete M is cast in the first and second cast-in-place concrete arrangement spaces s1 and s2 at once. This is the process of setting. The side slab placing step w27 includes a step of placing the cast-in-place concrete M in the lateral gap YS.

As shown in FIG. 13, the side slab placing step w27 is performed with respect to the side slab constituent frame Cw formed after connecting the lower panel unit main constituent U11 and the upper panel unit main constituent U21. The front formwork x1, the rear formwork x2, and the lateral gap formwork x3, which are the formwork for preventing the leakage of the cast-in-place concrete M, are arranged and then formed on the side slab constituent formwork Cw. The cast-in-place concrete M is placed in the first and second cast-in-place concrete arrangement spaces s1 and s2 and the lateral gap YS.

After the side slab placing step w27 is completed (the cast-in-place concrete M is hardened) and the formwork x1, x2, and x3 are removed, the step W3 for forming the top slab D is performed.

<Step W3 for forming top plate D>
The step W3 for forming the top plate D includes a top plate block transport installation step w31 for transporting and installing the top plate block 6 at a predetermined position on the left and right side plates C, and a top plate panel 5 for the left and right side plates C. Top plate panel transport installation process w32 for transporting and installing at a predetermined position, and cast-in-place concrete M is placed in the cast-in-place concrete arrangement space s3 for the top plate formed by the top plate block 6 and the top plate panel 5. It includes a plate placing process w33.

(Top plate block transport installation process w31)
In the top plate block transport installation step w31, as shown in FIG. 15, the top plate block 6 is straddled on the left and right side plates C by using a transport means (not shown) such as a crane. It is to be transported and installed in a predetermined position. The top slab block 6 is conveyed and installed so that the inner connecting reinforcing bar v2 erected on the upper panel 4 on the inner air side is inserted into the mortar-filled joint tz provided in the top slab block 6. ..

Other explanations regarding the top slab block transport installation step w31 (a step of arranging a plurality of top slab blocks 6 side by side in the front-rear direction and in the cast-in-place concrete arrangement space s3 for the top slab facing the top slab block 6). The process of arranging the external force distribution bars (not shown) and the process of integrating the upper panel 4 on the inner air side and the top plate block 6 are basically included in the lower panel unit transport installation process. Since it is the same as the above, the description thereof will be omitted.

(Top plate panel transfer installation process w32)
In the top plate panel transport installation step w32, as shown in FIG. 16, the top plate panel 5 is transported and installed at a predetermined position on the left and right side plates C by using a transport means (not shown) such as a crane. Is. The top plate panel 5 is conveyed and installed so that the outer connecting reinforcing bar v1 erected on the upper panel 3 on the outer air side is inserted into the mortar filling type joint tz provided in the top plate panel 5. ..

In addition, other explanations regarding the top plate panel transport installation step w32 (a step of arranging a plurality of top plate panels 5 side by side in the front-rear direction and a step of integrating the top panel 3 and the top plate panel 5 on the outer air side are described. The process of arranging the external force distribution bar p in the cast-in-place concrete arrangement space s3 for the top slab facing the top slab panel 5 is basically the same as the process of transporting and installing the panel unit below. Therefore, the description thereof will be omitted.

As shown in FIG. 17, the horizontal main bars t21 of the opposing top plate panels 5 are connected to each other via a connecting main bar t22 extending in the horizontal direction. The end of the horizontal main bar t21 and the end of the connecting main bar t22 are configured to be able to be connected via a joint (not shown). (In FIG. 17, the reinforcing steel material h and the like in the top plate block 6 are omitted without being shown for the convenience of grasping the connecting main bar t22.)
(Top plate placing process w33)
The top plate placing step w33 is a step of placing the cast-in-place concrete M in the cast-in-place concrete arrangement space s3 for the top plate after passing through the top plate block transport installation step w31 and the top plate panel transport installation step w32. .. The top slab placing step w33 includes a step of placing the cast-in-place concrete M in the lateral gap YS.

In the top slab placing process, as shown in FIG. 17, cast-in-place concrete M is applied to the top slab constituent formwork Dw formed after the top slab block 6 and the top slab panel 5 are connected to the side slab C. After arranging the front formwork x4, the rear formwork x5, the formwork for the lateral gap x6, and the lower formwork (not shown), which are the formwork for preventing the leakage of the concrete, the top plate constituent formwork The cast-in-place concrete M is placed in the cast-in-place concrete arrangement space s3 for the top slab formed in Dw and the lateral gap YS.

Then, through a predetermined finishing step, the final form of box culvert A as shown in FIGS. 1 to 4 is completed.

As described above, the method of constructing the box culvert A, which is the concrete structure shown in the present embodiment, includes the bottom slab B which is the base and the left and right side slabs C which are the wall bodies erected on the bottom slab B. It is a method of constructing a box culvert A equipped with.

The left and right side plates C of the box culvert A are a lower panel 1 on the outer air side, which is a first panel made of precast concrete, and a lower panel 2 on the inner air side, which is a second panel made of precast concrete. The first cast-in-place concrete M formed by placing cast-in-place concrete M in the first cast-in-place concrete arrangement space s1 provided between the lower panel 1 on the outer air side and the lower panel 2 on the inner air side. It is provided with a first cast-in-place plate component g1 which is a cast-in-place wall body component.

Then, the step W2 for forming the left and right side plates C is formed by connecting the lower panel 1 on the outer air side and the lower panel 2 on the inner air side, which are arranged apart from each other, by the temporary holding member K, and the outer side is not covered. The lower panel unit manufacturing process w21 for manufacturing the lower panel unit U1 in which the lower panels 1 and 2 on the empty side and the inner empty side can be integrally transported together with the temporary holding member K, and the lower panel unit U1 After passing through the lower panel unit transport installation step w23 and the lower panel unit transport installation step w23 to transport and install the bottom plate B at a predetermined position, the temporary holding member K is attached to the lower panel 1 on the outer air side and the inner air side. After passing through the first temporary holding member detaching step w24, which is the temporary holding member detaching step w24, and the first temporary holding member detaching step w24, the cast-in-place concrete M is placed in the first cast-in-place concrete arrangement space s1. It is provided with a side slab placing process w27, which is a wall body placing process.

Therefore, a method capable of suitably constructing a side plate C of a relatively large box culvert A by using cast-in-place concrete M together with lower panels 1 and 2 on the outer air side and the inner air side, which are members made of precast concrete. It will be something that can be provided.

That is, in order to construct the side plate C of the box culvert A, the lower panel unit U1 which is a structure temporarily unitized by using the temporary holding member K is used. Therefore, the temporary holding member K can be flexibly detached from the lower panels 1 and 2 on the outer air side and the inner air side at the site. With such a configuration, the lower panels 1 and 2 on the outer air side and the inner air side, which were transferred to the predetermined positions in the unitized state at the site, are separated from each other after being ununited. The position can be adjusted to.

Further, in order to construct the side plate C of the box culvert A, the lower panel unit U1 which is a temporarily unitized structure is used, so that not only the unit can be easily transported and installed at the site, but also the unit. Materials can be managed on a unit basis. Therefore, according to the method for constructing the box culvert A of the present embodiment, a large-sized box culvert A using a member made of precast concrete can be constructed accurately and smoothly.

By applying the method for constructing the box culvert A in this embodiment, it becomes difficult to generate excessively subdivided members during transportation and installation. As a result, with this method of constructing Box Culvert A, it is possible to reduce and rationalize the operating time of transport vehicles and heavy equipment, and it is preferable to shorten the construction period and reduce the number of reinforcing bars and formwork by improving the efficiency of on-site work. It can be realized and productivity can be improved.

Moreover, since the temporary holding member K is provided with the first temporary holding member detaching step w24, the temporary holding member K can be reused, is excellent in economy, and can contribute to the conservation of the global environment.

By applying this method of constructing Box Culvert A, there is a problem of labor shortage of field workers in recent years, for example, shortage of special workers (formwork, reinforcing bars, scaffolding, temporary support workers, etc.) in the field. Can be adequately dealt with by a limited number of people.

In other words, since the lower panel unit U1 and the upper panel unit U2 can be used to construct the box culvert A, the formwork and reinforcing bars are compared with the conventional construction method that relies mostly on cast-in-place concrete. , The number of scaffolds, temporary support works, etc. can be reduced suitably, and it is possible to flexibly respond to labor shortages.

The temporary holding member K is a first steel material k1 whose one end is attached to one end surface of the lower panel 1 on the outer air side and the other end is attached to one end surface of the lower panel 2 on the inner air side. One end is attached to the other end surface of the lower panel 1 on the outer air side, and the other end is composed of a second steel material k2 which is a member attached to the other end surface of the lower panel 2 on the inner air side.

Therefore, the temporary holding member K is realized by the first and second steel materials k1 and k2, which are less likely to cause complication of the structure and have excellent flexibility of reuse.

The lower panel unit transport installation step w23 includes a step of arranging a plurality of lower panel units U1 side by side in the horizontal direction, that is, in the front-rear direction, and between the end faces of the adjacent lower panels 1 on the outer air side and adjacent to each other. Lateral gaps YS, which are gaps through which the temporary holding member K released by the first temporary holding member releasing step w24 can pass, are provided between the end faces of the lower panel 2 on the inner air side.

Therefore, the first temporary holding member detaching step w24 can be performed extremely flexibly through the lateral gap YS. Moreover, by providing the lateral gap YS between the lower panel units U1 adjacent to each other in the front-rear direction, the lateral gap YS may occur in the lower panel 1 on the outer air side and the lower panel 2 on the inner air side. In addition, it is possible to absorb construction errors during installation and errors in the arrangement location due to non-landing extremely flexibly.

In other words, since the manufacturing error between the precast concrete members and the error due to construction can be suitably absorbed by the lateral gap YS, the box culvert A based on the design drawing can be constructed with high accuracy. It becomes.

The side slab placing step w27, which is a wall placing step, includes a step of placing cast-in-place concrete M in the lateral gap YS. For this reason, the cast-in-place concrete M is sandwiched between the members made of precast concrete (for example, between the lower panels 1 and 1 on the adjacent outer air side and between the lower panels 2 and 2 on the adjacent inner air side). , Adjacent members can be surely integrated with each other.

That is, when the precast concrete members are directly butted against each other, a minute gap is generated due to the unevenness of the joint surface, so that the adjacent precast concrete members are integrated without any gap. It was extremely difficult to do.

On the other hand, according to the method of constructing the box culvert A shown in the present embodiment, a lateral gap YS is positively provided between adjacent precast concrete members in advance, and the cast-in-place concrete M is provided in the lateral gap YS. I am trying to pour in. As a result, adjacent precast concrete members are suitably integrated with the cast-in-place concrete M in between, and even when stress is applied locally or partially, the stress is evenly applied to the whole. It is possible to construct a box culvert A having a suitable configuration that can be transmitted to concrete.

The lateral clearance YS is set to a size of 5 to 25 cm. Therefore, the on-site worker can work by putting his / her hand in the lateral gap YS, and it is easy to install the temporary holding member K and adjust and bind the installation location of the external force distribution muscle p through the lateral gap YS. It can be carried out and contributes to the efficiency of work.

By adjusting the size of the lateral gap YS between the outer air side and the inner air side, a general shape having a rectangular shape can be obtained without preparing a member made of precast concrete having a special shape. Using precast concrete members, it is possible to easily carry out construction (curve construction) that can be arranged not only linearly in the extension direction but also in a curved shape.

After passing through the lower panel unit transport installation step w23, a step of arranging external force distribution bars p communicating with the first cast-in-place concrete placement spaces s1 and s1 of the lower panel units U1 adjacent to each other in at least the front-rear direction. Therefore, the continuity in the extension direction can be suitably ensured by the external force distribution muscle p.

That is, since the conventional precast concrete structure basically has a structure in which the force distribution bars in the extension direction are divided, the seismic calculation method in the extension direction is different from that of the cast-in-place structure. It was difficult and complicated to change the design of what was designed by hitting.

However, by applying the method of constructing the box culvert A using the external force distribution muscle p as shown in the present embodiment, the seismic resistance calculation can be performed by the same method as that of the structure mainly composed of cast-in-place concrete. Therefore, the design and design change of the large box culvert A can be easily performed according to the conventional method.

The lower panel 1 on the outer air side and the lower panel 2 on the inner air side have a substantially rectangular plate shape, and are substantially parallel to each other when the lower panel unit U1 is configured. For this reason, both the lower panel 1 on the outer air side and the lower panel 2 on the inner air side, which are convenient for storage and management of the lower panel unit U1 and facilitate the installation work at the site, are used. A cantilevered reinforcing steel material h is provided in the first cast-in-place concrete arrangement space s1. Therefore, after the cast-in-place concrete M is placed in the first cast-in-place concrete arrangement space s1, the cast-in-place slab component g1 having excellent strength can be formed.

The present invention is not limited to the embodiments described in detail above.

The concrete structure and its manufacturing method may be related to a concrete structure including a base and a wall body erected on the base, and are not limited to the above-mentioned box culvert.

The temporary holding member may be configured to connect the first panel and the second panel arranged apart from each other so that the first and second panels can be integrally conveyed together with the temporary holding member. For example, it may have any configuration. The temporary holding member may be made of any material, and the connection position with respect to the first panel and the second panel is not limited to the side edge, and an appropriate position can be selected. Is.

The temporary holding member is not limited to two members (steel material, etc.), and may be composed of a single member or two or more members.

The tip of the reinforcing steel material protruding from each panel is not limited to the one bent in a U shape, but may be an L shape, a straight line that is not bent, or a plate or the like attached to the tip.

In the panel unit transfer installation step, it is not always necessary to form a gap through which the temporary holding member can pass between the end faces of the adjacent first panel and between the end faces of the adjacent second panels, either one of them. It may be formed in.

The gap need not be limited to the size shown in the above-described embodiment, and it goes without saying that the gap may be set to an appropriate size.

The method of forming the bottom plate or the top plate constituting the box culvert may be an appropriate method applied. That is, most of the bottom slab and the top slab may be formed of cast-in-place concrete, or most of the bottom slab and the top slab may be formed of precast concrete blocks.

The step for forming the side plate may be applied to form only a part of the side plate. That is, the panel unit transfer installation step may be applied only to form a part of the side plate.

The panel unit can adopt various forms as long as it has a unitized form, and is not limited to the one shown in the above-described embodiment.

For example, the first and second panels constituting the panel unit are not limited to plate-shaped ones, and various shapes can be adopted.

The temporary holding member is not limited to the L-shaped steel, and various shaped steels such as the H-shaped steel, the I-shaped steel, the T-shaped steel, the flat-shaped steel, and the channel steel can be applied.

In the above-described embodiment, in the step for forming the side plate which is a wall body, two panel units are formed by stacking them in the vertical direction, but the present invention is not limited to such a case. For example, in order to form a wall body, the panel units may not be stacked in the vertical direction, or a plurality of three or more panel units may be stacked in the vertical direction.

The side plate placing process may be performed after the lower panel unit transport installation process is completed. More specifically, after completing the lower panel unit transport installation process, the side slab placing process is executed to place the cast-in-place concrete in the first cast-in-place concrete arrangement space, and then the upper part is placed. The panel unit transport installation step of the above may be performed, and then a new side slab placing step may be executed in order to place the cast-in-place concrete in the second cast-in-place concrete arrangement space.

It is desirable that the reinforcing steel materials protruding from both the first panel and the second panel are arranged so as to overlap each other when viewed from a predetermined direction orthogonal to the longitudinal direction.

In order to increase the degree of connection between panel units adjacent to each other in the front-rear direction, external force reinforcing bars, which are reinforcing bars that can pass through the virtual boundary between adjacent panel units in the front-rear direction, are arranged in the cast-in-place concrete arrangement space. It is desirable to do. It is desirable that a plurality of external force distribution bars are arranged at predetermined positions and then embedded in cast-in-place concrete.

Further, when the width direction (transverse direction) of the box culvert to be constructed is long, a wall or a pillar may be provided between the bottom slab and the top slab.

In addition, the specific configuration of each part is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

1 ... Lower panel on the outside air side (first panel)
2 ... Lower panel on the inner sky side (second panel)
A ... Box culvert (concrete structure)
B ... Bottom plate (base)
C ... Side version (wall body)
K ... Temporary holding member M ... Cast-in-place concrete g1 ... First cast-in-place side slab component (cast-in wall component)
s1 ... First cast-in-place concrete placement space (cast-in-place concrete placement space)
U1 ... Lower panel unit (panel unit)
W2 ... Step for forming a side plate (step for forming a wall body)
w21 ... Lower panel unit manufacturing process (panel unit manufacturing process)
w23 ... Lower panel unit transfer installation process (panel unit transfer installation process)
w24 ... First temporary holding member detaching step (temporary holding member detaching step)
w27 ... Side plate placing process (wall body placing process)

Claims (9)

A method of constructing a concrete structure including a base and a wall body erected on the base.
A cast-in-place concrete arrangement in which the wall body is provided between the first panel made of precast concrete, the second panel made of precast concrete, and the first panel and the second panel. It is equipped with a cast-in-place wall component formed by placing cast-in-place concrete in the space.
The process for forming the wall body
The first panel and the second panel arranged apart from each other are connected by a temporary holding member, and the first and second panels can be integrally conveyed together with the temporary holding member. The panel unit manufacturing process that manufactures the panel unit and
The panel unit transport installation process of transporting and installing the panel unit at a predetermined position of the base, and
After passing through the panel unit transport installation step, the temporary holding member detaching step of detaching the temporary holding member from the first and second panels,
After passing through the temporary holding member detaching step, a wall casting step of placing cast-in-place concrete in the cast-in-place concrete arrangement space and a wall-casting step.
How to build a concrete structure. The temporary holding member has one end attached to one end surface of the first panel and the other end attached to one end surface of the second panel, and one end of the other end surface of the first panel. The method for constructing a concrete structure according to claim 1, wherein the member is attached to an end face and the other end is both or one of the members attached to the other end face of the second panel. The panel unit transport installation step includes a step of arranging a plurality of the panel units side by side in the horizontal direction.
A gap is provided between the end faces of the adjacent first panel and / or one of the end faces of the adjacent second panel so that the temporary holding member released by the temporary holding member detaching step can pass through. The method for constructing a concrete structure according to claim 2. The method for constructing a concrete structure according to claim 3, wherein the gap is set to a size of 5 to 25 cm. The method for constructing a concrete structure according to claim 3 or 4, wherein the wall casting step includes a step of casting cast-in-place concrete in the gap. The panel unit transport installation step includes a step of arranging a plurality of the panel units side by side in the horizontal direction.
Any of claims 1 to 5, wherein the temporary holding member detaching step includes at least a step of arranging external force distribution bars so as to communicate with each cast-in-place concrete arrangement space of the adjacent panel units. The method for constructing a concrete structure according to item 1. The invention according to any one of claims 1 to 6, wherein the first panel and the second panel have a substantially rectangular plate shape and are substantially parallel to each other when the panel unit is configured. How to build a concrete structure. The invention according to any one of claims 1 to 7, wherein a reinforcing steel material that cantileverly protrudes in the cast-in-place concrete arrangement space is provided on both or one of the first and second panels. How to build a concrete structure. The base is the bottom version of Box Culvert,
The method for constructing a concrete structure according to any one of claims 1 to 8, wherein the wall body is a left and right side slab provided on the bottom slab of the box culvert.

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