JP2021042610A - Culvert structure and construction method therefor - Google Patents

Abstract

To provide a culvert structure and construction method thereof that can improve working efficiency during construction and secure transportability of components, and assure proof stress of a constructed culvert structure.SOLUTION: A culvert structure is provided with lateral walls configuring lateral faces of the culvert structure and a top plate configuring a ceiling plane. The top plate is composed of a precast top plate component as an understructure and a cast in-situ top plate component as an upper structure. The precast top plate component has a plurality of under main steel bars parallely arranged in a width direction of the culvert structure, a plurality of under distributing bars parallely arranged in a longer direction of the culvert structure, and a plurality of corrugated steel bars with a corrugated form extending to the thickness direction of the precast top plate component. The under main steel bar and the under distributing bar are provided within the precast top plate component. The corrugated steel bars are configured to partially embed the lower side of a height direction into the precast concrete part of the precast top plate component, and to partially protrude the upper side of the height direction to the inside of the cast in-situ top plate component from the precast concrete part of the precast top plate component.SELECTED DRAWING: Figure 6

Description

The present invention relates to a culvert structure using a precast concrete member and a method for constructing the culvert structure.

In recent years, the construction of new trunk roads has shifted from plains to mountainous areas, and the number of new roads that pass through steep mountainous areas is increasing. In road construction in mountainous areas, as the ratio of tunnels and bridges increases, the number of high embankments increases, and the construction of culvert structures (also simply called culverts) that cross them increases. Known culvert structures include box culverts having a substantially rectangular frame shape and arch culverts having a horseshoe-shaped cross section (arch-section arch type), and these structures are made of, for example, reinforced concrete. Generally, a structure such as a tunnel is constructed by constructing an embankment in parallel with or after the construction of the culvert structure.

As a technique for constructing a culvert structure, a technique for embedding reinforcing bars in concrete is generally known. For example, in Patent Document 1, a main reinforcing bar and a wavy reinforcing bar are embedded in concrete to construct a reinforced concrete wall. The technology is disclosed. Further, for example, Patent Document 2 discloses a reinforcing bar arrangement technique for a reinforcing member for improving the yield strength of a planar member among reinforced concrete structural members.

In addition, when constructing a culvert structure, a so-called precast concrete member (also simply called a precast member), in which a member manufactured in advance at a factory or the like is brought into the site and assembled to an existing member, may be used. ..

Utility model application public notice No. 54-698 Japanese Unexamined Patent Publication No. 2013-221355

In a reinforced concrete structure as described in Patent Documents 1 and 2, since the reinforcing bars in the concrete are arranged by the work in the field, the work tends to be complicated. In particular, since a complicated bar arrangement structure is adopted at the corners of the culvert structure, it is required to improve the efficiency of work in the field.

Therefore, an object of the present invention is to improve the work efficiency at the time of construction by using the precast concrete member, to secure the transportability of the member, and to secure the proof stress of the constructed culvert structure. The purpose is to provide a possible culvert structure and a method for constructing the structure.

In order to achieve the above object, according to the present invention, a culvert structure made of reinforced concrete, a side wall forming a side surface of the culvert structure, and a top plate forming a ceiling surface of the culvert structure. The top plate is composed of a precast top plate member as a lower structure and a field-launched plate member as an upper structure, and the precast top plate members are arranged in parallel in the width direction of the culvert structure. A plurality of lower main reinforcements orthogonal to the lower main reinforcement and arranged parallel to the longitudinal direction of the culvert structure, and a plurality of lower force distribution bars arranged parallel to the width direction of the culvert structure, and the precast It has a plurality of corrugated reinforcing bars having a corrugated shape that moves up and down in the thickness direction of the top plate member, and the lower main reinforcing bar and the lower force distribution bar are provided inside the precast top plate member and have the corrugated shape. A part of the reinforcing bar on the lower side in the height direction is embedded in the precast concrete part of the precast top plate member, and a part on the upper side in the height direction is embedded in the precast concrete part of the precast top plate member. A culvert structure is provided, which is characterized in that it is constructed so as to project into a member.

The precast top plate member has a thickened portion that is thickened downward at both ends in the width direction, and the thickened portion constitutes a corner portion of the culvert structure, and the wave height of the corrugated reinforcing bar is , The thickened portion may be amplified to a wave height that covers the inside of the thickened portion.

Inside the in-situ top plate member, a plurality of upper main reinforcing bars arranged parallel to the width direction of the culvert structure and a plurality of upper main reinforcing bars arranged orthogonal to the upper main reinforcing bars and parallel to the longitudinal direction of the culvert structure. The upper main reinforcing bar and the upper reinforcing bar may be provided at a position corresponding to the upper end portion of the corrugated reinforcing bar.

The upper main reinforcing bar is composed of a bent portion including a portion that bends at both ends in the width direction of the top plate and a straight portion located substantially in the center of the width direction of the top plate, and is one of the reinforcing bars protruding above the side wall. The portion and the bent portion may be connected via the reinforcing bar receiving hole.

The reinforcing bar protruding above the side wall is composed of a first reinforcing bar along the outer surface side of the side wall and a second reinforcing bar along the inner surface side of the side wall, and the first reinforcing bar is inside the thickened portion. The second reinforcing bar may be connected to the bent portion via the reinforcing bar receiving hole, the second reinforcing bar may penetrate the through hole inside the thickened portion, and the upper end thereof may be embedded in the on-site top plate member.

The reinforcing bar receiving hole may have a sleeve-type reinforcing bar joint structure in which reinforcing bars are connected to each other by injecting a time-curing material into the inside and hardening the reinforcing bar.

Further, according to the present invention from another viewpoint, in the above-described method for constructing a calvert structure, a side wall construction step of constructing a side wall having a plurality of reinforcing bars protruding upward on the ground and a side wall projecting from the side wall. The precast top plate member installation step of installing the precast top plate member on the upper part of the side wall in a state where the plurality of reinforcing bars are received by the reinforcing bar receiving holes, the upper main reinforcing bar, the upper force distribution bar, and the first It is characterized by having a cast-in-place slab construction step of constructing cast-in-place concrete so that the upper end of the reinforcing bar 2 and the portion of the corrugated reinforcing bar protruding from the precast concrete portion are embedded in the concrete. , A method of constructing a calvert structure is provided.

According to the present invention, by using the precast concrete member, the work efficiency at the time of construction can be improved, the transportability of the member can be ensured, and the proof stress of the constructed culvert structure can be ensured. Further, in addition to the role as a reinforcing bar for reinforcing the corner portion of the constructed culvert structure, the proof stress of the entire structure can be improved by providing a corrugated reinforcing bar that plays a role as a shear reinforcing bar.

It is a schematic explanatory drawing of the culvert structure which concerns on embodiment of this invention. It is a schematic explanatory drawing about the construction method of a culvert structure. It is a schematic explanatory drawing about the construction method of a culvert structure. It is a schematic explanatory drawing about the construction method of a culvert structure. It is a schematic explanatory drawing about the construction method of a culvert structure. It is a schematic explanatory drawing about the construction method of a culvert structure. It is a schematic explanatory view (substantial side view) which enlarged the thickened part. It is a schematic explanatory view (substantially top view) which enlarged the thickened part.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present specification and the drawings, components having substantially the same functional configuration may be designated by the same reference numerals to omit duplicate description. Further, in the present specification, the structure of the culvert structure 1 and its top plate (including the precast top plate member 20 described later) are closely illustrated, and the ground on which the culvert structure 1 is installed is shown. It may be omitted for the sake of explanation and simplification of illustration. Further, for the sake of explanation, the reinforcing bar structure inside the member may be illustrated.

(Structure of culvert structure according to the embodiment of the present invention)
FIG. 1 is a schematic explanatory view of a culvert structure 1 according to an embodiment of the present invention. The culvert structure 1 shown in FIG. 1 is a rectangular culvert-shaped hollow structure installed at the entrance of a tunnel or the like provided for a trunk road or a railway (not shown), and inside the culvert structure 1, for example, an automobile or a railroad vehicle. A route (not shown) is laid for the passage. In the following, the direction in which the internal space of the calvert structure 1 extends is the longitudinal direction, the direction parallel to the laying surface of the calvert structure 1 and orthogonal to the longitudinal direction is the width direction, and the calvert structure 1 is laid. The vertical direction of the above will be described as the height direction.

As shown in FIG. 1, the culvert structure 1 according to the present embodiment includes side walls 5 (5a, 5b) constructed in the vertical direction with respect to the ground, and a top plate 10 which is a ceiling surface. Further, the top plate 10 has a two-layer structure, and is composed of a precast top plate member 20 as a lower structure and an on-site top plate member 21 as an upper structure. The detailed configuration of the top plate 10 will be described later with reference to the drawings.

Further, the precast top plate member 20 has a shape that is thickened downward at both ends in the width direction, and the thickened portions 25 (25a, 25b) form an upper corner portion of the culvert structure 1. .. The shape of the thickened portion 25 can be arbitrarily designed, but for example, as shown in the figure, it may be designed to have a shape (so-called gradient haunch shape) in which the rectangular cross section of the internal space of the culvert structure 1 is cut out diagonally. good. Here, the thickness of the thickened portion 25 is preferably about 40 to 50% of the thickness of the top plate 10, for the purpose of strengthening the corner portion of the culvert structure 1 and preventing stress concentration.

(How to build a culvert structure)
Here, a method of constructing the culvert structure 1 according to the present embodiment will be described. 2 to 6 are schematic explanatory views on the construction method of the culvert structure 1, and the construction process is shown in the order of FIGS. 2 to 6. The configuration of the reinforcing bars shown in FIGS. 2 to 6 is an example, and the arrangement and number of these reinforcing bars can be arbitrarily designed.

As shown in FIG. 2, first, the left and right side walls 5 (5a, 5b) are constructed by, for example, cast-in-place concrete. At this time, a reinforcing bar 30 is provided on the side wall 5, and a plurality of reinforcing bars 30 are provided on the upper end of the side wall 5 in a state of protruding upward (side wall construction step). The reinforcing bar 30 is composed of, for example, a first reinforcing bar 30a along the outer surface side of the side wall 5 and a second reinforcing bar 30b along the inner surface side of the side wall 5, each of which projects to the upper part of the side wall 5 by a predetermined length. There is.

Next, as shown in FIG. 3, the precast top plate member 20 is installed on the upper part of the side wall 5 (precast top plate member installation step). Here, the thickened portion 25 of the precast top plate member 20 is provided with a reinforcing bar receiving hole 35 such as a through hole or a hole for a sleeve joint at a predetermined position, and the reinforcing bar 30 protruding above the side wall 5 is these. The precast top plate member 20 is installed so as to penetrate the reinforcing bar receiving hole 35.

In the reinforcing bar receiving hole 35, when all the predetermined reinforcing bars are received, a time-curing material such as mortar or concrete is injected and cured to connect the side wall 5 and the precast top plate member 20. Will be done. As an example, a sleeve type reinforcing bar joint structure may be used as the reinforcing bar receiving hole 35.

As shown in FIG. 3, in the precast top plate member 20, a plurality of lower main reinforcing bars 40 arranged parallel to the width direction of the culvert structure 1 inside the precast top plate member 20 and a direction orthogonal to the lower main reinforcing bar 40 (that is, that is). , A plurality of lower force distribution bars 42 arranged in the longitudinal direction of the culvert structure 1) are provided. The precast top plate member 20 is provided with a corrugated reinforcing bar 50 having a corrugated shape that moves up and down in the thickness direction (height direction of the culvert structure 1). The corrugated reinforcing bar 50 is composed of one continuous reinforcing bar in the width direction of the culvert structure 1, and one corrugated reinforcing bar 50 thus configured is arranged in a plurality of longitudinal directions of the culvert structure 1. Provided. Further, the upper side of the corrugated reinforcing bar 50 in the height direction is provided so as to project upward from the main body portion 20a (precast concrete portion) of the precast top plate member 20 made of precast concrete or the like, and the corrugated reinforcing bar 50 is provided. The lower side in the height direction of the concrete is embedded in the main body 20a.

The amount of protrusion of the corrugated reinforcing bar 50 from the main body 20a can be arbitrarily designed, but as shown in FIG. 1, a structure is adopted in which the on-site top plate member 21 is provided above the precast top plate member 20. In order to enjoy the action and effect of preventing slippage between the precast top plate member 20 and the on-site top plate member 21, the amount of protrusion of the corrugated reinforcing bar 50 is preferably 5 times or more the diameter of the reinforcing bar. On the other hand, an increase in the amount of reinforcing bars leads to an increase in the weight of the precast top plate member 20, and there is a concern that work efficiency and transportability during construction may decrease. Further, the upper limit of the protrusion amount of the corrugated reinforcing bar 50 ensures that the reinforcing bar cover is not affected by corrosion when the corrugated reinforcing bar 50 is embedded in cast-in-place concrete (cast-in-place top plate member 21 described later). It is preferable that the height is as high as possible.

Then, as shown in FIGS. 4 and 5, a plurality of upper main reinforcing bars 60 arranged parallel to the width direction of the culvert structure 1 are provided at the upper end portion (mountain top portion) of the corrugated reinforcing bar 50. Further, at the upper end of the corrugated reinforcing bar 50, a plurality of upper force distribution bars 62 are provided in a direction orthogonal to the upper main reinforcing bar 60 (that is, a longitudinal direction of the culvert structure 1) (upper reinforcing bar arrangement step). Here, as shown in FIG. 5, the upper main reinforcing bar 60 is composed of a bent portion 60a including a portion bent at both ends in the width direction and a straight portion 60b located substantially in the center in the width direction. For example, one end of the bent portion 60a is connected to the first reinforcing bar 30a, and the other end is connected to the straight portion 60b. For the connection at this time, for example, a sleeve type reinforcing bar joint structure is used.

Then, as shown in FIG. 6, the site so that the upper main reinforcing bar 60, the upper force distribution bar 62, the protruding portion of the corrugated reinforcing bar 50 from the main body 20a, and the upper end of the second reinforcing bar 30b are embedded in the concrete. The cast concrete is constructed, and the cast-in-place plate member 21 is constructed (site-cast plate construction process). As described above, the side wall 5, the precast top plate member 20, and the on-site top plate member 21 are integrated in a state where the internal reinforcing bars are connected to each other, and the culvert structure 1 according to the present embodiment is constructed.

(Structure of reinforcing bars in precast top plate members)
As described above with reference to FIGS. 2 to 6, the culvert structure 1 according to the present embodiment is constructed, and in the construction thereof, various reinforcing bars are particularly provided inside the thickened portion 25 of the precast top plate member 20. Is arranged. With these reinforcing bar configurations, the side wall 5 and the precast top plate member 20 or the precast top plate member 20 and the on-site top plate member 21 are effectively connected, and the proof stress of the culvert structure 1 is improved. .. Here, the structure of the reinforcing bar in the thickened portion 25 will be described.

7 and 8 are schematic explanatory views of the thickened portion 25 of the precast top plate member 20 and its vicinity in the culvert structure 1 according to the present embodiment, FIG. 7 is a substantially side view, and FIG. 8 is a schematic side view. It is a top view. As shown in FIGS. 7 and 8, the precast top plate member 20 is provided with a plurality of lower main reinforcing bars 40, a plurality of lower force distribution bars 42, and a corrugated reinforcing bar 50 projecting upward. Further, as shown in the drawing, a through hole as a reinforcing bar receiving hole 35 or a hole for a sleeve joint is provided inside the thickened portion 25, and the reinforcing bar 30 and the upper main reinforcing bar 60 provided on the side wall 5 are the reinforcing bar receiving holes. It is connected via 35.

The upper side of the corrugated reinforcing bar 50 is embedded in the on-site top plate member 21, and a plurality of upper main reinforcing bars 60 and a plurality of upper force distribution bars 62 are provided, and as described above, the upper main reinforcing bars 60 are provided. And the reinforcing bar 30 (the first reinforcing bar 30a) are connected to each other via the reinforcing bar receiving hole 35. On the other hand, in the thickened portion 25, the lower side of the corrugated reinforcing bar 50 has a wavy shape extending into the thickened portion 25, and the wave height of the corrugated reinforcing bar 50 provided in the precast top plate member 20 is , The configuration differs depending on the position in the member (main body portion 20a and thickening portion 25). The wave height of the corrugated reinforcing bar 50 is arbitrarily designed, and is amplified to a wave height that covers the inside of the thickened portion 25. That is, the corrugated reinforcing bar 50 projects upward from the precast top plate member 20, and is arranged so as to cover the entire inside of the precast top plate member 20.

Further, the upper main reinforcing bar 60 and the upper force distribution bar 62 may be arranged at positions corresponding to the upper end portion of the corrugated reinforcing bar 50, and the upper force distribution bar 62 is the upper end portion (mountain top portion) of the corrugated reinforcing bar 50. As shown in the figure, the upper force distribution bar 62 may be provided so as to intersect with the inside of the upper end portion of the plurality of corrugated reinforcing bars 50.

Further, the culvert structure 1 is provided with an oblique reinforcing bar 70 over the inside of the precast top plate member 20 and the on-site top plate member 21. As shown, the oblique reinforcing bars 70 are mainly arranged over the thickening portion 25 and the inside of the in-situ top plate member 21, one end of which is fixed to the upper force distribution bar 62, and the other end is fixed. It is fixed to the auxiliary reinforcing bar 72 arranged in the thickening portion 25. The diagonal reinforcing bar 70 is basically provided along the inner surface side (inner surface side of the culvert structure) of the thickening portion 25, and the end portion thereof fits inside the thickening portion 25 according to the shape of the thickening portion 25 and the like. It may be folded like this.

(Action effect)
As described above, according to the culvert structure 1 configured as described with reference to FIGS. 1 to 8, the precast top plate member 20 is composed of a main body portion 20a and a thickening portion 25. Further, among the reinforcing bars provided inside, the upper side of the corrugated reinforcing bar 50 in the height direction is configured to protrude upward from the main body portion 20a made of precast concrete or the like. The corrugated reinforcing bar 50 serves as a corner reinforcing bar of the culvert structure 1 and also serves as a slip stopper between the precast top plate member 20 and the on-site top plate member 21 (seam position). As a result, the structural safety and proof stress of the constructed culvert structure 1 are sufficiently ensured. In addition, the corrugated reinforcing bar 50 uses a single reinforcing bar shaped into a wavy shape, and has a higher fixing force to concrete than a conventional short reinforcing bar such as a shear reinforcing bar, and the culvert structure 1 The strength of the concrete is improved.

Further, in constructing the culvert structure 1, the side wall 5 and the cast-in-place plate member 21 are cast-in-place members, whereas the precast top plate member 20 is a so-called precast concrete member manufactured in advance at a factory or the like. As a result, when the culvert structure 1 is made of reinforced concrete, the material cost is increased by using the precast member for the part that requires the most labor in the cast-in-place construction method, instead of constructing the culvert structure 1 entirely with precast members. And shorten the construction period. By adopting such a so-called half precast structure, the members whose bar arrangement structure is the most complicated and the on-site casting method is difficult are used as precast members, and the other members are used as on-site casting members at the time of construction. It is possible to achieve both improvement in work efficiency and transportability of members.

In particular, in the corner portion of the culvert structure 1 (corresponding to the thickened portion 25 in the present embodiment), reinforcing bars for reinforcing the corner portion are complicatedly arranged as a countermeasure against an earthquake or the like. It is known, and it may be difficult to construct by the cast-in-place method. Therefore, as the precast top plate member 20 according to the present embodiment, a member having such a complicated reinforcing bar arrangement structure is manufactured in advance at a factory or the like and transported to the site, thereby increasing the material cost. Reduction and shortening of construction period will be achieved.

Further, in the present embodiment, the precast top plate member 20 is configured such that the diagonal reinforcing bar 70 is housed inside the thickened portion 25. As a result, the reinforcing bar arrangement structure in the thickened portion (so-called haunch portion) 25 of the precast top plate member 20 can be easily manufactured in advance at the factory.

Further, in the precast top plate member 20 according to the present embodiment, a reinforcing bar receiving hole 35 such as a through hole or a sleeve joint hole is provided in the thickened portion 25. Then, in a state where the predetermined reinforcing bar is received in the reinforcing bar receiving hole 35, a time-curing material such as mortar or concrete is injected, cured, and connected. By firmly connecting each member such as the side wall 5, the precast top plate member 20, and the on-site top plate member 21 by using such a connecting means, it is possible to efficiently construct a highly safe culvert structure 1. it can.

Although an example of the embodiment of the present invention has been described above, the present invention is not limited to the illustrated embodiment. It is clear that a person skilled in the art can come up with various modifications or modifications within the scope of the ideas described in the claims, which naturally belong to the technical scope of the present invention. It is understood as a thing.

For example, in the above embodiment, it has been described that the side wall 5 is constructed by the cast-in-place method, but the side wall 5 may also be a precast member. Further, although it has been explained that the plurality of upper main reinforcing bars 60 and the plurality of upper force distribution bars 62 are arranged at the time of construction at the site, the precast top plate member 20 is also used for these upper main reinforcing bars 60 and the upper force distribution bars 62. It may be manufactured in advance at the factory as a part of. In particular, when the culvert structure 1 is small, it is preferable to use a precast member within a possible range in consideration of the transportability of the member and the like.

Further, in the above embodiment, the reinforcing bar structure illustrated and described is an example, and various reinforcing bars (lower main reinforcing bar, lower force distribution bar, corrugated reinforcing bar, upper main reinforcing bar, upper force distribution bar, diagonal reinforcing bar, auxiliary reinforcing bar, etc. ) Can be arbitrarily designed.

The present invention can be applied to a box culvert top plate member using a precast concrete member, a culvert structure, and a construction method thereof.

1 ... Culvert structure 5 ... Side wall 10 ... Top plate 20 ... Precast top plate member 21 ... On-site top plate member 25 ... Thickened part 30 ... Reinforcing bar (on the side wall) 35 ... Reinforcing bar receiving hole 40 ... Lower main reinforcing bar 42 ... Lower part Distributing bar 50 ... Corrugated reinforcing bar 60 ... Upper main reinforcing bar 62 ... Upper reinforcing bar 70 ... Diagonal reinforcing bar 72 ... Auxiliary reinforcing bar

Claims (7)

A culvert structure made of reinforced concrete
The side wall forming the side surface of the culvert structure and
A top plate constituting the ceiling surface of the culvert structure is provided.
The top plate consists of a precast top plate member as a lower structure and an on-site top plate member as an upper structure.
The precast top plate member includes a plurality of lower main reinforcing bars arranged parallel to the width direction of the culvert structure.
A plurality of lower force distribution bars orthogonal to the lower main reinforcing bar and arranged parallel to the longitudinal direction of the culvert structure,
It has a plurality of corrugated reinforcing bars arranged parallel to the width direction of the culvert structure and having a corrugated shape that moves up and down in the thickness direction of the precast top plate member.
The lower main reinforcing bar and the lower force distribution bar are provided inside the precast top plate member.
A part of the corrugated reinforcing bar on the lower side in the height direction is embedded in the precast concrete part of the precast top plate member, and a part on the upper side in the height direction is from the precast concrete part of the precast top plate member to the site. A culvert structure characterized in that it is constructed so as to project into a top plate member. The precast top plate member has thickened portions that are thickened downward at both ends in the width direction.
The thickened portion constitutes a corner portion of the culvert structure.
The culvert structure according to claim 1, wherein the wave height of the corrugated reinforcing bar is amplified to a wave height that covers the inside of the thickened portion in the thickened portion. Inside the on-site top plate member, a plurality of upper main reinforcing bars arranged parallel to the width direction of the culvert structure,
A plurality of upper force distribution bars orthogonal to the upper main reinforcing bar and arranged parallel to the longitudinal direction of the culvert structure are provided.
The culvert structure according to claim 1 or 2, wherein the upper main reinforcing bar and the upper force distribution bar are provided at positions corresponding to the upper end portions of the corrugated reinforcing bar. The upper main reinforcing bar is composed of a bent portion including a portion that bends at both ends in the width direction of the top plate and a straight portion located substantially in the center of the top plate in the width direction.
The culvert structure according to claim 3, wherein a part of the reinforcing bar protruding from the upper part of the side wall and the bent portion are connected via a reinforcing bar receiving hole. The reinforcing bar protruding above the side wall is composed of a first reinforcing bar along the outer surface side of the side wall and a second reinforcing bar along the inner surface side of the side wall.
The first reinforcing bar is connected to the bent portion via the reinforcing bar receiving hole inside the thickened portion.
The culvert structure according to claim 4, wherein the second reinforcing bar penetrates a through hole inside the thickened portion, and the upper end thereof is embedded in the on-site top plate member. The culvert structure according to claim 4 or 5, wherein the reinforcing bar receiving hole has a sleeve-type reinforcing bar joint structure in which reinforcing bars are connected to each other by injecting a time-curing material into the inside and hardening the reinforcing bar. Stuff. The method for constructing a culvert structure according to any one of claims 4 to 6.
A side wall construction process that builds a side wall with multiple reinforcing bars protruding upward on the ground,
A precast top plate member installation step of installing the precast top plate member on the upper part of the side wall in a state where a plurality of reinforcing bars protruding from the side wall are received by the reinforcing bar receiving holes.
Cast-in-place concrete is constructed so that the upper main reinforcing bar, the upper force distribution bar, the upper end of the second reinforcing bar, and the portion of the corrugated reinforcing bar protruding from the precast concrete portion are embedded in the concrete. A method for constructing a culvert structure, which comprises a top plate construction step.

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