JP7670981B2 - How to Build a Box Culvert - Google Patents

Description

The present invention relates to a method for constructing a box culvert.

In recent years, construction of new trunk roads has been shifting from plains to mountainous areas, with an increase in the number of new roads passing through steep mountainous areas. In road construction in mountainous areas, the proportion of tunnels and bridges is increasing, leading to an increase in high embankments, and the construction of culvert structures (also simply called culverts) that cross these is on the rise. One example of a culvert structure is the box culvert, which has a roughly rectangular cross section. Culvert structures are constructed using a variety of construction methods, for example, by combining precast concrete members and cast-in-place concrete.

For example, Patent Document 1 discloses a method for joining precast members. In the technology described in Patent Document 1, as box culverts become larger and more precast, they are manufactured by dividing them into multiple precast members, which are then joined and assembled. This improves workability and prevents the joints from opening up during an earthquake.

For example, Patent Document 2 discloses a technique for dividing a precast box-shaped product and assembling multiple blocks made of precast concrete to construct it. This makes it possible to easily transport each block and produce, for example, a large precast box-shaped product.

JP 2020-94391 A Japanese Patent Application Publication No. 8-151626

In recent years, culvert structures have become larger, and there is a demand for the manufacture of box culverts with an outer width of, for example, more than 12 m. When constructing a large box culvert, it is necessary to divide the components that make up the box culvert due to restrictions on transportation and construction. As exemplified by Patent Documents 1 and 2 above, when dividing components and assembling them to construct a box culvert, it was common to assemble multiple components on a stand in advance and install the integrated top plate member that was connected and integrated on an assembly stand by suspending it.

However, the method of assembling multiple components on a frame in advance and then installing the integrated product poses issues such as the need to secure a yard for constructing the assembly frame, increased costs, and the need for larger cranes for lifting. In other words, there is a demand for further improvements in workability when constructing box culverts by combining separate components using precast components.

In view of the above circumstances, the object of the present invention is to provide a method for constructing a box culvert that improves workability when precast members are used in the construction of the box culvert.

In order to achieve the above-mentioned object, according to the present invention, there is provided a method for constructing a box culvert, comprising: a first sidewall installation step of installing a first sidewall member at a predetermined position on site; a first sidewall connecting step of connecting a top plate member and a bottom plate member to the first sidewall member after the first sidewall installation step; and a second sidewall connecting step of simultaneously connecting a second sidewall member to the top plate member and the bottom plate member after the first sidewall connecting step, wherein in the second sidewall connecting step, the second sidewall member is slid horizontally, and a reinforcing bar protruding from the connecting surface of the other member is inserted into a sleeve embedded in one of the opposing connecting surfaces, and then the gap of the sleeve is filled with a time-dependent hardening material.

The first sidewall member and the second sidewall member each have a protrusion at the top and bottom that extends horizontally through a corner portion, and in the first sidewall connecting step, a slab-shaped first bottom plate member is connected to extend the protrusion provided at the bottom of the first sidewall member, and a slab-shaped first top plate member is connected to extend the protrusion provided at the top of the first sidewall member, and in the second sidewall connecting step, the protrusion provided at the top of the second sidewall member is connected to the first top plate member, and at the same time, the protrusion provided at the bottom of the second sidewall member is connected to the first bottom plate member.

The method further includes a third sidewall connecting step of connecting a third sidewall member to the top plate member and the bottom plate member, the first sidewall member being an intermediate wall of a box culvert, the protruding portion protruding in both left and right directions from the first sidewall member, and in the first sidewall connecting step, the slab-shaped first bottom plate member and the second bottom plate member are connected to both sides of the protruding portion so as to extend the protruding portion provided at the lower part of the first sidewall member, and the slab-shaped first top plate member and the second top plate member are connected to the protruding portion so as to extend the protruding portion provided at the upper part of the first sidewall member. In the third sidewall connecting step, the protruding portion provided on the upper part of the third sidewall member is connected to the second top plate member, and at the same time, the protruding portion provided on the lower part of the third sidewall member is connected to the second bottom plate member. The connection between the members in the third sidewall connecting step may be performed by sliding the third sidewall member horizontally and inserting a reinforcing bar protruding from the connecting surface of the other member into a sleeve embedded in one of the connecting surfaces facing each other, and then filling the gap in the sleeve with a time-hardening material.

Each side wall member may be divided into two or more side wall partition members in the vertical direction of the box culvert, and prior to connecting each side wall member with each of the top plate members and each of the bottom plate members, a process may be included in which a reinforcing bar protruding from one of the side wall partition members is inserted into a sleeve embedded in the end of the other side wall partition member, and then the gap in the sleeve is filled with a time-hardening material to construct each of the side wall members.
In addition, in the second side wall connecting process, a guide member may be attached across the upper surface of the second side wall member and the upper surface of the top plate member, and a chain connected to the guide member may be wound up to slide the second side wall member horizontally while maintaining the height position of the second side wall member, thereby connecting the second side wall member and the top plate member.

The present invention makes it possible to improve workability when using precast members in the construction of box culverts.

The above effects are not necessarily limiting, and any of the effects shown in this specification or other effects that can be understood from this specification may be achieved in addition to or instead of the above effects.

1 is a schematic explanatory diagram of a box culvert according to an embodiment of the present invention. FIG. FIG. 1 is a schematic diagram illustrating a method for constructing a box culvert. FIG. 1 is a schematic diagram illustrating a method for constructing a box culvert. FIG. 1 is a schematic diagram illustrating a method for constructing a box culvert. FIG. 1 is a schematic diagram illustrating a method for constructing a box culvert. FIG. 1 is a schematic diagram illustrating a method for constructing a box culvert. FIG. 1 is a schematic diagram illustrating a method for constructing a box culvert. FIG. FIG. 1 is an explanatory diagram showing an example of a conventional construction method for a box culvert.

The following describes an embodiment of the present invention with reference to the drawings. In this specification and the drawings, components that have substantially the same functional configuration may be given the same reference numerals to avoid repetitive explanation. Note that in this embodiment, for the purpose of explanation, some illustrations of the reinforcement structure and reinforcement arrangement may be omitted, or reinforcement bars inside the components may be illustrated.

<Box culvert configuration>
Fig. 1 is a schematic explanatory diagram of a box culvert 1 according to an embodiment of the present invention. The box culvert 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 main road or a railway (not shown), and a path is laid inside the box culvert for passing through, for example, automobiles, railway vehicles, etc. Although the configuration of the box culvert to which the present invention is applied is arbitrary, in this embodiment, as an example, a configuration in which the internal space of the box culvert 1 is divided into two by an intermediate wall and two paths are laid is illustrated and described.

In the following explanation, the direction in which the internal space of the box culvert 1 extends is defined as the length direction, the direction parallel to the installation surface of the box culvert 1 and perpendicular to the length direction is defined as the width direction, and the vertical direction when the box culvert 1 is installed is defined as the height direction (up and down direction).

As shown in FIG. 1, the box culvert 1 includes a bottom plate 3 laid on the ground, a side wall 5 constructed vertically to the ground, and a top plate 10 constructed approximately parallel to the ground at the top of the side wall 5. The top plate 10 is placed on the top of the side wall 5 and is provided to form the ceiling surface of the box culvert 1. In addition, a bottom plate 3 is provided that is parallel to the top plate 10 and forms at least a part of the bottom surface located at the bottom of the box culvert 1.

In the configuration according to this embodiment, the sidewall portion 5 includes a first sidewall member 20, a second sidewall member 30, and a third sidewall member 40, all of which are precast. The sidewall members 20, 30, and 40 are arranged in parallel at a predetermined interval in the width direction of the box culvert 1. The first sidewall member 20 is configured as a so-called intermediate wall located approximately in the center of the width direction of the box culvert 1, and the second sidewall member 30 and the third sidewall member 40 are configured as so-called outer walls located as a pair of left and right walls on both sides of the width direction of the box culvert 1.

The first sidewall member 20, the second sidewall member 30, and the third sidewall member 40 may be constructed by combining multiple precast divided members, or may be constructed by dividing them into two sidewall divided members in the vertical direction and combining them as shown in the figure. In the configuration according to this embodiment, the first sidewall member 20 is constructed of two upper and lower sidewall divided members 20a, 20b. The second sidewall member 30 is constructed of two upper and lower sidewall divided members 30a, 30b. The third sidewall member 40 is constructed of two upper and lower sidewall divided members 40a, 40b.

The first sidewall member 20, the second sidewall member 30, and the third sidewall member 40 are provided with overhanging portions that extend horizontally through the corners of the internal space of the box culvert 1. The first sidewall member 20 is provided with an overhanging portion 22 at its upper portion and an overhanging portion 24 at its lower portion. The second sidewall member 30 is provided with an overhanging portion 32 at its upper portion and an overhanging portion 34 at its lower portion. The third sidewall member 40 is provided with an overhanging portion 42 at its upper portion and an overhanging portion 44 at its lower portion.

In the configuration according to this embodiment, the overhangs 22, 24 provided on the first sidewall member 20 are configured to extend in both the left and right directions in the width direction of the box culvert 1. The overhangs 32, 34 provided on the second sidewall member 30 are configured to extend toward the inside of the box culvert 1. The overhangs 42, 44 provided on the third sidewall member 40 are configured to extend toward the inside of the box culvert 1.

A precast first top plate member 50 is disposed between the overhanging portion 22 of the first sidewall member 20 and the overhanging portion 32 of the second sidewall member 30, extending in the direction of extending these overhanging portions 22, 32. In addition, a precast second top plate member 52 is disposed between the overhanging portion 22 of the first sidewall member 20 and the overhanging portion 42 of the third sidewall member 40, extending in the direction of extending these overhanging portions 22, 42. The top plate portion 10, which serves as the ceiling surface of the box culvert 1, is configured to include the first top plate member 50 and the second top plate member 52.

A precast first base plate member 60 is disposed between the overhanging portion 24 of the first sidewall member 20 and the overhanging portion 34 of the second sidewall member 30, and extends in the direction of extending these overhanging portions 24, 34. In addition, a precast second base plate member 62 is disposed between the overhanging portion 24 of the first sidewall member 20 and the overhanging portion 44 of the third sidewall member 40, and extends in the direction of extending these overhanging portions 24, 44. The base plate portion 3 as the bottom surface of the box culvert 1 is configured to include the first base plate member 60 and the second base plate member 62.

<How to construct a box culvert>
Here, a method for constructing the box culvert 1 according to this embodiment will be described. Figures 2 to 7 are schematic diagrams for explaining the method for constructing the box culvert 1, and the construction process is shown in the order of Figures 2 to 7. Note that Figures 2 to 7 show the box culvert 1 as viewed from the front of the route, and the configuration of the reinforcing bars shown in each drawing is one example, and the arrangement, number, etc. of these can be designed as desired.

As shown in FIG. 2, the upper sidewall partition member 20a is hung from above the lower sidewall partition member 20b of the first sidewall member 20 laid on the installation target surface G, which is, for example, the ground, by a crane (not shown). The lower sidewall partition member 20b is provided with a plurality of reinforcing bars 26 protruding upward from its upper end. In addition, the upper sidewall partition member 20a has a plurality of sleeves 27 embedded in its lower end. As shown in FIG. 2 and FIG. 3, when the sidewall partition member 20a is installed, the reinforcing bars 26 are inserted into the sleeves 27, and in this state, the gaps in the sleeves 27 are filled with a time-curing material to integrate the sidewall partition members 20a and 20b, and the first sidewall member 20 is constructed.

Next, a process of connecting the first base plate member 60 and the second base plate member 62 to the first side wall member 20 is performed. As shown in FIG. 3, a protruding portion 24 is provided at the lower part of the first side wall member 20. The protruding portion 24 is configured to extend in both left and right directions in the width direction of the box culvert 1. Both ends of the protruding portion 24 in the width direction are configured as connecting surfaces, and a plurality of sleeves 28 are embedded therein. The first base plate member 60 and the second base plate member 62 are slid horizontally (widthwise) from both sides of the protruding portion 24, and the connecting surfaces of the base plate members 60, 62 and the connecting surface of the protruding portion 24 are connected. The connecting surfaces of the first base plate member 60 and the second base plate member 62 are provided with a plurality of reinforcing bars 29 protruding horizontally from the respective connecting surfaces. As shown in FIG. 3, in the process of connecting the first base plate member 60 and the second base plate member 62, the reinforcing bar 29 is inserted into the sleeve 28, and in that state, the gap in the sleeve 28 is filled with a time-hardening material to connect them.

Then, a process of connecting the first top plate member 50 and the second top plate member 52 to the first sidewall member 20 is carried out. As shown in FIG. 4, the upper part of the first sidewall member 20 is provided with a protruding portion 22. The protruding portion 22 is configured to extend in both the left and right directions in the width direction of the box culvert 1. Both end portions of the protruding portion 22 in the width direction are configured as connecting surfaces, and multiple sleeves 55 are embedded in them.

As shown in the figure, shoring 70, 70 is installed on the bottom plate members 60, 62, and the first top plate member 50 and the second top plate member 52 are slid horizontally (widthwise) on these shoring 70, 70, respectively, and the connecting surfaces of each top plate member 50, 52 are connected to the connecting surface of the overhanging portion 22. At that time, a pulling jig 80 may be used to pull the first top plate member 50 and the second top plate member 52 toward the first side wall member 20. In addition, the shoring 70 may be provided with a jack 72 for adjusting the vertical position of the object (here, the bottom plate members 60, 62) placed on the shoring.

The connecting surfaces of the first top plate member 50 and the second top plate member 52 are provided with a plurality of reinforcing bars 56 that protrude horizontally from each connecting surface. As shown in FIG. 4, in the process of connecting the first top plate member 50 and the second top plate member 52, the reinforcing bars 56 are inserted into the sleeve 55, and in that state, the gaps in the sleeve 55 are filled with a time-hardening material to connect them.

In this specification, the process of connecting the first bottom plate member 60 and the second bottom plate member 62 to the first sidewall member 20 and the process of connecting the first top plate member 50 and the second top plate member 52 to the first sidewall member 20, as described above with reference to Figures 3 and 4, may be referred to as the "first sidewall connecting process."

Next, as shown in Figures 5 and 6, a process is carried out in which the two upper and lower side wall division members 30a, 30b are connected to construct the second side wall member 30, and a process is carried out in which the two upper and lower side wall division members 40a, 40b are connected to construct the third side wall member 40.

In the configuration according to this embodiment, the lower sidewall partition member 30b is provided with a number of reinforcing bars 36 that protrude upward from its upper end. The upper sidewall partition member 30a has a number of sleeves 37 embedded in its lower end. When constructing the second sidewall member 30, the upper sidewall partition member 30a is hung from above the lower sidewall partition member 30b by a crane (not shown) or the like and installed. At that time, the reinforcing bars 36 are inserted into the sleeves 37, and the gaps in the sleeves 37 are filled with a time-hardening material to integrate the sidewall partition members 30a and 30b, and the second sidewall member 30 is constructed.

In the configuration according to this embodiment, the lower sidewall partition member 40b is provided with a number of reinforcing bars 46 that protrude upward from its upper end. The upper sidewall partition member 40a has a number of sleeves 47 embedded in its lower end. When constructing the third sidewall member 40, the upper sidewall partition member 40a is hung from above the lower sidewall partition member 40b by a crane (not shown) or the like and installed. At that time, the reinforcing bars 46 are inserted into the sleeves 47, and the gaps in the sleeves 47 are filled with a time-hardening material to integrate the sidewall partition members 40a and 40b, and the third sidewall member 40 is constructed.

Then, a process is carried out in which the second sidewall member 30 is connected to the first top plate member 50 and the first bottom plate member 60, and a process is carried out in which the third sidewall member 40 is connected to the second top plate member 52 and the second bottom plate member 62.

As shown in Figures 5 and 6, the second side wall member 30 has an overhang 32 at its upper part and an overhang 34 at its lower part. The overhangs 32 and 34 are configured to extend toward the inside of the box culvert 1. The inner end of the overhang 32 is configured as a connecting surface, and a plurality of reinforcing bars 82 protruding horizontally from the connecting surface are provided. The outer end of the first top plate member 50 (the end facing the overhang 32) is configured as a connecting surface, and a plurality of sleeves 84 are embedded in the connecting surface. Similarly, the inner end of the overhang 34 is configured as a connecting surface, and a plurality of reinforcing bars 86 protruding horizontally from the connecting surface are provided. The outer end of the first bottom plate member 60 (the end facing the overhang 34) is configured as a connecting surface, and a plurality of sleeves 88 are embedded in the connecting surface.

The third side wall member 40 is provided with a protruding portion 42 at its upper portion and a protruding portion 44 at its lower portion. The protruding portions 42, 44 are configured to extend toward the inside of the box culvert 1. The inner end of the protruding portion 42 is configured as a connecting surface, and a plurality of reinforcing bars 92 protruding horizontally from the connecting surface are provided. The outer end of the second top plate member 52 (the end facing the protruding portion 42) is configured as a connecting surface, and a plurality of sleeves 94 are embedded in the connecting surface. Similarly, the inner end of the protruding portion 44 is configured as a connecting surface, and a plurality of reinforcing bars 96 protruding horizontally from the connecting surface are provided. The outer end of the second bottom plate member 62 (the end facing the protruding portion 44) is configured as a connecting surface, and a plurality of sleeves 98 are embedded in the connecting surface.

The second side wall member 30 configured as described above is slid inward in the horizontal direction (width direction) as shown in FIG. 6. Here, a pulling jig 100 may be used to pull the second side wall member 30 inward. The connecting surface of the first top plate member 50 and the connecting surface of the overhanging portion 32 are connected, and at the same time, the connecting surface of the first bottom plate member 60 and the connecting surface of the overhanging portion 34 are connected. At that time, the reinforcing bar 82 is inserted into the sleeve 84, and the gap of the sleeve 84 is filled with a time-hardening material in that state to connect them. In addition, the reinforcing bar 86 is inserted into the sleeve 88, and the gap of the sleeve 88 is filled with a time-hardening material in that state to connect them. In this way, the protruding portion 32 connects to the first top plate member 50, and the protruding portion 34 connects to the first bottom plate member 60, so that the second sidewall member 30 connects to the first top plate member 50 and the first bottom plate member 60.

In addition, the process of connecting the second sidewall member 30 to the first top plate member 50 and the first bottom plate member 60, which is described in this specification with reference to FIG. 6, may be referred to as the "second sidewall connecting process."

Similarly, the third side wall member 40 configured as described above is slid inward in the horizontal direction (width direction) as shown in FIG. 6. At that time, the same pulling jig 100 as described above may be used. The connecting surface of the second top plate member 52 and the connecting surface of the overhanging portion 42 are connected, and at the same time, the connecting surface of the second bottom plate member 62 and the connecting surface of the overhanging portion 44 are connected. At that time, the reinforcing bar 92 is inserted into the sleeve 94, and the gap of the sleeve 94 is filled with a time-hardening material in that state to connect them. In addition, the reinforcing bar 96 is inserted into the sleeve 98, and the gap of the sleeve 98 is filled with a time-hardening material in that state to connect them. In this way, the overhanging portion 42 is connected to the second top plate member 52, and the overhanging portion 44 is connected to the second bottom plate member 62, so that the third side wall member 40 is connected to the second top plate member 52 and the second bottom plate member 62.

In addition, the process of connecting the third sidewall member 40 to the second top plate member 52 and the second bottom plate member 62, which is described in this specification with reference to FIG. 6, may be referred to as the "third sidewall connecting process."

Then, as shown in FIG. 7, after each side wall member 20, 30, 40 is connected to each top plate member 50, 52 and each bottom plate member 60, 62, the support 70 is removed and the box culvert 1 is constructed. As shown in the figure, the box culvert 1 is constructed by connecting the bottom plate portion 3 laid on the ground so as to include the first bottom plate member 60 and the second bottom plate member 62, the side wall portion 5 constructed vertically to the bottom plate portion 3 and consisting of each side wall member 20, 30, 40, and the top plate portion 10 including the first top plate member 50 and the second top plate member 52 and constructed on the upper part of the side wall portion 5.

<Configuration of the pulling jig>
The configuration of the pulling jig 100 (see FIG. 6) used in the method for constructing the box culvert 1 according to this embodiment will be described below with reference to FIG. 8. The pulling jig 80 shown in FIG. 4 has a similar configuration, and an example of the pulling jigs 80 and 100 is a lever hoist.

Figure 8 is a schematic enlarged view of the pulling jig 100. Here, as an example, a case is shown in which the jig is used to connect the connecting surface of the first top plate member 50 and the connecting surface of the protruding portion 32. That is, Figure 8 is a schematic enlarged view of the dashed line portion shown in Figure 6.

As shown in FIG. 8, the pulling jig 100 includes a guide member 102 that is disposed between the object to be pulled (here, the overhanging portion 32) and the pulling side member (here, the first top plate member 50). The guide member 102 is provided with wheels 104 for moving the guide member 102 on the pulling side member. The pulling jig 100 also includes a holding portion 105 that is fixed to the guide member 102, a holding portion 106 that is fixed to the pulling side member, and a chain 107 that is stretched between them. A winding portion 110 for winding up the stretched chain 107 is also provided between the holding portions 105 and 106.

The guide member 102 is placed between the object to be pulled (hereinafter, the overhang 32) and the member to be pulled (hereinafter, the first top plate member 50), and the winding section 110 is driven to wind up the chain 107 while the guide section 102 and the overhang 32 are connected. In the first top plate member 50, the guide section 102 is configured to be freely movable by the wheels 104, and the overhang 32 slides horizontally (widthwise) via the guide section 102 when the chain 107 is wound up.

By using the pulling jig 100 configured in this way to connect the overhanging portion 32 and the first top plate member 50, efficient construction can be performed in a simple manner. The pulling jig 100 may be provided with a height adjustment mechanism (not shown) for adjusting the height of the object to be pulled. This allows the height of the object to be pulled and the pulling side member to be suitably adjusted, and for example, in this embodiment, the alignment when inserting the reinforcing bar 82 into the sleeve 84 can be efficiently performed.

<Effects of this embodiment>
According to the method for constructing the box culvert 1 according to the present embodiment configured as described above, there is no need to assemble and integrate multiple components on the frame in advance, which avoids the need to secure a yard for constructing the assembly frame, increasing costs, and using a large crane for lifting. In particular, when constructing a large box culvert, it is necessary to use divided components due to transportation and construction constraints, and this improves workability.

Figure 9 is an explanatory diagram showing an example of a conventional construction method for box culverts. A conventional construction method is known in which multiple components are assembled on a stand in advance and then installed as an integrated unit. As an example, as shown in Figure 9, the side wall portion 200 and the deck portion 201 are first installed as an integrated unit, and then the top plate member 210, which is composed of multiple integrated components, is suspended from above and installed. In Figure 9, the top plate member 210 is configured with a corner portion, and the multiple components are assembled in an assembly yard near the construction site.

In the method for constructing the box culvert 1 according to this embodiment, there is no need to secure a yard or other space for pre-assembling the top plate member 210, which is composed of multiple members as shown in FIG. 9. In addition, in the case of conventional construction methods, when multiple members are combined and integrated, an integration process may be performed at the joints between the members, for example, by filling with mortar or the like. When the top plate member 210, which is composed of multiple members integrated, is hung and installed, bending is applied to the joints, so sufficient hardening of the joints is required. In other words, a hardening time is required to sufficiently harden the hardening material at the joints, which raises concerns about the longer construction period, but in this respect, the construction period is shortened by the method for constructing the box culvert 1 according to this embodiment.

In addition, in the box culvert 1 according to this embodiment, precast members are used for each side wall member, each top plate member, and each bottom plate member, and the box culvert 1 is constructed by combining a number of these precast members. In this way, the use of precast members makes it possible to improve work efficiency during construction and the transportability of the members.

Although one embodiment of the present invention has been described above, the present invention is not limited to the illustrated form. It is clear that a person skilled in the art can come up with various modified or revised examples within the scope of the ideas described in the claims, and it is understood that these also naturally fall within the technical scope of the present invention.

In the above embodiment, the box culvert 1 is illustrated and described as being configured such that its internal space is divided into two by an intermediate wall and two paths are laid, but the scope of application of the present invention is not limited to this. That is, in the above embodiment, the first sidewall member 20 is configured as a so-called intermediate wall located approximately in the center of the width of the box culvert 1, and the second sidewall member 30 and the third sidewall member 40 are configured as so-called outer walls located as a pair of left and right walls on both sides of the width of the box culvert 1, but the configuration of the box culvert 1 is not limited to this.

For example, the box culvert may have only one path in its internal space. In that case, the first sidewall member and the second sidewall member may be constructed as a so-called outer wall positioned as a pair of left and right walls. As a construction method, for example, a first sidewall connecting step may be performed in which the top plate member and the bottom plate member are connected to the first sidewall member, and then a second sidewall connecting step may be performed in which the second sidewall member is connected to the top plate member and the bottom plate member. In this case, a construction method may be adopted in which the sidewall members described in the above embodiment are slid and connected in the second sidewall connecting step.

In addition, in the above embodiment, each sidewall member is illustrated and described as being constructed by combining two sidewall division members, one above the other, but the configuration of the sidewall members is not limited to this. That is, each sidewall member may be constructed from a single precast member, or may be constructed from two or more divided members.

In the above embodiment, the components are connected to each other using a so-called joint structure that combines a reinforcing bar and a sleeve, but the configuration is not limited to the one shown. For example, in the connection between the connecting surface of the first top plate member 50 and the connecting surface of the overhanging portion 32, a configuration is shown in which a sleeve 84 is embedded in the first top plate member 50 and a reinforcing bar 82 protrudes from the overhanging portion 32, but the opposite configuration may also be used, in which the reinforcing bar protrudes from the first top plate member 50 and the sleeve is embedded in the overhanging portion 32. The same applies to the connection between other components.

Furthermore, the effects described in this specification are merely descriptive or exemplary and are not limiting. In other words, the technology disclosed herein may achieve other effects that are apparent to a person skilled in the art from the description in this specification, in addition to or in place of the above effects.

The present invention can be applied to a method for constructing a box culvert.

[0033] 1...box culvert 3...bottom plate portion 5...side wall portion 10...top plate portion 20...first side wall member 20a, 20b...side wall partition member (of first side wall member) 22...projection portion (of upper part of first side wall member) 24...projection portion (of lower part of first side wall member) 26...reinforcing bar 27...sleeve 28...sleeve 29...reinforcing bar 30...second side wall member 30a, 30b...side wall partition member (of second side wall member) 32...projection portion (of upper part of second side wall member) 34...projection portion (of lower part of second side wall member) 36...reinforcing bar 37...sleeve 40...third side wall member 40a, 40b...side wall partition member (of third side wall member) 42...projection portion (of upper part of third side wall member) 44...Protruding portion (of the lower part of the third side wall member) 46...Reinforcing bar 47...Sleeve 50...First top plate member 52...Second top plate member 55...Sleeve 56...Reinforcing bar 60...First bottom plate member 62...Second bottom plate member 70...Support 72...Jack 80...Pulling jig 82...Reinforcing bar 84...Sleeve 86...Reinforcing bar 88...Sleeve 92...Reinforcing bar 94...Sleeve 96...Reinforcing bar 98...Sleeve 100...Pulling jig 102...Guide member 104...Wheels 105, 106...Holding portion 107...Chain 110...Winding portion G...Surface to be laid

Claims (5)

A method for constructing a box culvert, comprising the steps of:
a first side wall installation step of installing the first side wall member at a predetermined position on the site;
a first side wall connecting step of connecting a top plate member and a bottom plate member to the first side wall member after the first side wall installing step ;
a second sidewall connecting step of simultaneously connecting a second sidewall member to the top plate member and the bottom plate member after the first sidewall connecting step,
A method for constructing a box culvert, characterized in that in the second side wall connecting process, the second side wall member is slid horizontally, and a reinforcing bar protruding from the connecting surface of the other member is inserted into a sleeve embedded in one of the opposing connecting surfaces, and then the gap of the sleeve is filled with a time-hardening material. the first side wall member and the second side wall member each have a protruding portion at an upper part and a protruding portion at a lower part, the protruding portion extending in a horizontal direction via a corner portion;
In the first side wall connecting step, a slab-shaped first bottom plate member is connected to extend the protruding portion provided at the lower part of the first side wall member, and a slab-shaped first top plate member is connected to extend the protruding portion provided at the upper part of the first side wall member,
The method for constructing a box culvert as described in claim 1, characterized in that in the second side wall connecting process, a protrusion provided on the upper part of the second side wall member is connected to the first top plate member, and at the same time, a protrusion provided on the lower part of the second side wall member is connected to the first bottom plate member. The method further includes a third side wall connecting step of connecting a third side wall member to the top plate member and the bottom plate member,
The first side wall member is an intermediate wall of a box culvert, and the protruding portion protrudes in both left and right directions from the first side wall member,
In the first side wall connecting step, a slab-shaped first bottom plate member and a second bottom plate member are connected to both sides of the protruding portion provided at the lower part of the first side wall member, the protruding portion being sandwiched therebetween, and a slab-shaped first top plate member and a second top plate member are connected to both sides of the protruding portion provided at the upper part of the first side wall member, the protruding portion being sandwiched therebetween,
In the third side wall connecting step, a protruding portion provided on an upper portion of the third side wall member is connected to the second top plate member, and at the same time, a protruding portion provided on a lower portion of the third side wall member is connected to the second bottom plate member,
The method of constructing a box culvert as described in claim 2, characterized in that the connection of members in the third side wall connection process is carried out by sliding the third side wall member horizontally and inserting a reinforcing bar protruding from the connecting surface of the other member into a sleeve embedded in one of the opposing connecting surfaces, and then filling the gap of the sleeve with a time-hardening material. Each of the side wall members is divided into two or more side wall division members in the vertical direction of the box culvert,
A method for constructing a box culvert as described in any one of claims 1 to 3, characterized in that, prior to the stage of connecting each side wall member with each top plate member and each bottom plate member, the method includes a step of inserting a reinforcing bar protruding from one of the side wall partition members into a sleeve embedded in the end of the other side wall partition member, and then constructing each of the side wall members by filling the gaps in the sleeve with a time-dependent hardening material. The method for constructing a box culvert as described in claim 1, characterized in that in the second side wall connecting process, a guide member is attached across the upper surface of the second side wall member and the upper surface of the top plate member, and the second side wall member is slid horizontally while maintaining the height position of the second side wall member by winding up a chain connected to the guide member, thereby connecting the second side wall member and the top plate member.

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