How to Build a Box Culvert

Abstract

To improve workability when using a precast member in a construction of a box culvert.SOLUTION: A construction method of a box culvert includes: a first side wall connecting process in which a top slab member and a bottom slab member are connected to a first side wall member; and a second side wall connecting process in which after the first side wall connecting process, the top slab member and the bottom slab member are connected to a second side wall member. In the second side wall connecting process, the second side wall member is slid in a horizontal direction and a reinforcing bar protruding from a connecting surface of one member of opposing connecting surfaces is inserted into a sleeve buried in the other connecting surface, then a gap portion of the sleeve is filled with a time-curable material.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a method for constructing a box culvert. [Background technology]

[0002] In recent years, construction of new trunk roads has been shifting from plains to mountainous areas, and the number of new roads passing through steep mountainous areas is increasing. 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 embankments is increasing. One example of a culvert structure is the box culvert, which has a roughly rectangular cross section. Culvert structures are constructed using various construction methods, for example, by combining precast concrete members and cast-in-place concrete.

[0003] For example, Patent Document 1 discloses a method for joining precast members. In the technology described in Patent Document 1, in order to promote the enlargement and precast construction of box culverts, the precast members are divided and manufactured, and then joined together to assemble them. This improves workability and prevents the joints from opening during earthquakes.

[0004] For example, Patent Document 2 discloses a technique for constructing a precast box-shaped product by dividing it into parts and assembling multiple blocks made of precast concrete. This makes it possible to easily transport each block and produce, for example, a large precast box-shaped product. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2020-94391 A [Patent Document 2] Japanese Patent Application Publication No. 8-151626 Summary of the Invention [Problem to be solved by the invention]

[0006] In recent years, culvert structures have become larger, and there is a demand for the manufacture of box culverts with an outer width exceeding 12 m, for example. 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 typified by Patent Documents 1 and 2 above, when dividing components and combining 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.

[0007] However, the method of assembling multiple components on a frame in advance and 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 divided components using precast components.

[0008] In view of the above circumstances, an object of the present invention is to provide a method for constructing a box culvert that improves workability when using precast members in the construction of a box culvert. [Means for solving the problem]

[0009] In order to achieve the above object, the present invention provides a method for constructing a box culvert, comprising the steps of: a first side wall installation step of installing a first side wall member at a predetermined position on site; and after the first side wall installation step, a first side wall connecting step of connecting a top plate member and a bottom plate member to a first side wall member; and a second side wall member connected to the top plate member and the bottom plate member after the first side wall connecting step. at the same timeand a second side wall connecting step of connecting the first and second side wall members to each other, wherein in the second side wall connecting step, the second side wall member is slid horizontally, 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 in the sleeve is filled with a time-hardening material.

[0010] The first sidewall member and the second sidewall member each have a protrusion at the upper and lower parts extending horizontally through a corner portion, and in the first sidewall connecting process, a slab-shaped first bottom plate member is connected to extend the protrusion provided at the lower part of the first sidewall member, and a slab-shaped first top plate member is connected to extend the protrusion provided at the upper part of the first sidewall member, and in the second sidewall connecting process, the protrusion provided at the upper part of the second sidewall member is connected to the first top plate member, and at the same time, the protrusion provided at the lower part of the second sidewall member is connected to the first bottom plate member.

[0011] 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 being an intermediate wall of a box culvert, the protruding portion protruding in both left and right directions from the first side wall member, and in the first side wall 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 side wall 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 side wall member. and in the third side wall connecting step, a protrusion provided on an upper part of the third side wall member is connected to the second top plate member, and at the same time, a protrusion provided on a lower part of the third side wall member is connected to the second bottom plate member, and the connection of the members in the third side wall connecting step may be performed 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-curing hardening material.

[0012] 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 step 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-dependent 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. Effect of the Invention

[0013] According to the present invention, it is possible to improve workability when using precast members in the construction of a box culvert.

[0014] 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. [Brief description of the drawings]

[0015] [Figure 1] 1 is a schematic explanatory diagram of a box culvert according to an embodiment of the present invention. FIG. [Diagram 2] FIG. 1 is a schematic diagram illustrating a method for constructing a box culvert. [Diagram 3] FIG. 1 is a schematic diagram illustrating a method for constructing a box culvert. [Figure 4] FIG. 1 is a schematic diagram illustrating a method for constructing a box culvert. [Diagram 5] FIG. 1 is a schematic diagram illustrating a method for constructing a box culvert. [Figure 6] FIG. 1 is a schematic diagram illustrating a method for constructing a box culvert. [Figure 7] FIG. 1 is a schematic diagram illustrating a method for constructing a box culvert. [Figure 8] FIG. [Figure 9] FIG. 1 is an explanatory diagram showing an example of a conventional construction method for a box culvert. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In this specification and the drawings, components having substantially the same functional configuration may be given the same reference numerals to avoid repetitive explanation. In this embodiment, for the purpose of explanation, some illustrations of the reinforcing bar structure and reinforcing bar arrangement may be omitted, or reinforcing bars inside the members may be illustrated.

[0017] <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, for example, 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. The box culvert to which the present invention is applied may have any configuration, but 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.

[0018] In the following explanation, the direction in which the internal space of box culvert 1 extends is referred to as the length direction, the direction parallel to the installation surface of box culvert 1 and perpendicular to the length direction is referred to as the width direction, and the vertical direction when box culvert 1 is installed is referred to as the height direction (up and down direction).

[0019] 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 on the upper part of the side wall 5. The top plate 10 is placed on the upper part of the side wall 5 and is provided so as to form the ceiling surface of the box culvert 1. In addition, a bottom plate 3 is provided which is parallel to the top plate 10 and forms at least a part of the bottom surface located at the lower part of the box culvert 1.

[0020] In the configuration according to this embodiment, the side wall portion 5 includes a first side wall member 20, a second side wall member 30, and a third side wall member 40, all of which are precast. The side wall members 20, 30, and 40 are arranged in parallel at a predetermined interval in the width direction of the box culvert 1. The first side wall 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 side wall member 30 and the third side wall 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.

[0021] The first side wall member 20, the second side wall member 30, and the third side wall member 40 may be constructed by combining a plurality of precast divided members, or may be constructed by combining two side wall divided members vertically as shown in the figure. In the configuration according to this embodiment, the first side wall member 20 is constructed by two upper and lower side wall divided members 20a and 20b. The second side wall member 30 is constructed by two upper and lower side wall divided members 30a and 30b. The third side wall member 40 is constructed by two upper and lower side wall divided members 40a and 40b.

[0022] 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.

[0023] In the configuration according to this embodiment, the overhanging portions 22, 24 provided on the first sidewall member 20 are configured to extend in both left and right directions in the width direction of the box culvert 1. The overhanging portions 32, 34 provided on the second sidewall member 30 are configured to extend toward the inside of the box culvert 1. The overhanging portions 42, 44 provided on the third sidewall member 40 are configured to extend toward the inside of the box culvert 1.

[0024] 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 extension of 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 extension of these overhanging portions 22, 42. The top plate portion 10 serving 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.

[0025] Between the overhanging portion 24 of the first sidewall member 20 and the overhanging portion 34 of the second sidewall member 30, a precast first bottom plate member 60 is disposed, extending in the direction of extending these overhanging portions 24, 34. In addition, between the overhanging portion 24 of the first sidewall member 20 and the overhanging portion 44 of the third sidewall member 40, a precast second bottom plate member 62 is disposed, extending in the direction of extending these overhanging portions 24, 44. The bottom plate portion 3 as the bottom surface of the box culvert 1 is configured to include the first bottom plate member 60 and the second bottom plate member 62.

[0026] <How to build 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 their arrangement, number, etc. can be designed arbitrarily.

[0027] 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 a target installation surface G, which is, for example, the ground, by a crane or the like (not shown). The lower sidewall partition member 20b is provided with a plurality of reinforcing bars 26 protruding upward from its upper end. 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, thereby integrating the sidewall partition members 20a and 20b, and the first sidewall member 20 is constructed.

[0028] Next, a process of connecting the first bottom plate member 60 and the second bottom plate member 62 to the first side wall member 20 is performed. As shown in FIG. 3, the lower part of the first side wall member 20 is provided with a protruding portion 24. 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 bottom plate member 60 and the second bottom plate member 62 are slid horizontally (width direction) from both sides of the protruding portion 24, and the connecting surfaces of the bottom plate members 60, 62 and the connecting surface of the protruding portion 24 are connected. The connecting surfaces of the first bottom plate member 60 and the second bottom plate member 62 are provided with a plurality of reinforcing bars 29 protruding horizontally from the respective connecting surfaces. As shown in Figure 3, in the process of connecting the first base plate member 60 and the second base plate member 62, a 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.

[0029] Next, a process is performed in which the first top plate member 50 and the second top plate member 52 are connected to the first side wall member 20. As shown in Fig. 4, an overhanging portion 22 is provided on the upper portion of the first side wall member 20. The overhanging portion 22 is configured to extend in both left and right directions in the width direction of the box culvert 1. Both side end portions in the width direction of the overhanging portion 22 are configured as connecting surfaces, and a plurality of sleeves 55 are embedded therein.

[0030] As shown in the figure, shoring 70, 70 is installed on bottom slab members 60, 62, and the first top slab member 50 and the second top slab member 52 are slid horizontally (widthwise) on these shoring 70, 70, respectively, so that the connecting surfaces of the top slab members 50, 52 are connected to the connecting surfaces of the overhanging portions 22. At this time, a pulling jig 80 may be used to pull the first top slab member 50 and the second top slab member 52 toward the first side wall member 20. In addition, the shoring 70 may be provided with a jack 72 for adjusting the height position of an object (here, the bottom slab members 60, 62) placed on the shoring.

[0031] 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 protruding 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 sleeves 55, and in this state, the gaps in the sleeves 55 are filled with a time-hardening material to connect the first top plate member 50 and the second top plate member 52.

[0032] In this specification, the process of connecting the first bottom plate member 60 and the second bottom plate member 62 to the first side wall member 20, and the process of connecting the first top plate member 50 and the second top plate member 52 to the first side wall member 20, as described above with reference to Figures 3 and 4, may be referred to as the ``first side wall connecting process.''

[0033] Next, as shown in Figures 5 and 6, a process is performed in which the two upper and lower side wall dividing members 30a, 30b are connected to construct the second side wall member 30, and a process is performed in which the two upper and lower side wall dividing members 40a, 40b are connected to construct the third side wall member 40.

[0034] In the configuration according to this embodiment, the lower sidewall partition member 30b is provided with a plurality of reinforcing bars 36 protruding upward from its upper end. The upper sidewall partition member 30a has a plurality 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-curing material in this state, whereby the sidewall partition members 30a and 30b are integrated together, and the second sidewall member 30 is constructed.

[0035] In the configuration according to this embodiment, the lower sidewall partition member 40b is provided with a plurality of reinforcing bars 46 protruding upward from its upper end. The upper sidewall partition member 40a has a plurality 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-curing material in this state, so that the sidewall partition members 40a and 40b are integrated, and the third sidewall member 40 is constructed.

[0036] Then, a process is performed in which the second side wall member 30 is connected to the first top plate member 50 and the first bottom plate member 60, and a process is performed in which the third side wall member 40 is connected to the second top plate member 52 and the second bottom plate member 62.

[0037] As shown in Figs. 5 and 6, the second side wall member 30 has an overhanging portion 32 at its upper portion and an overhanging portion 34 at its lower portion. The overhanging portions 32 and 34 are configured to extend toward the inside of the box culvert 1. The inner end of the overhanging portion 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 overhanging portion 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 overhanging portion 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 overhanging portion 34) is configured as a connecting surface, and a plurality of sleeves 88 are embedded in the connecting surface.

[0038] 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 are provided protruding horizontally from the connecting surface. 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 are provided protruding horizontally from the connecting surface. 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.

[0039] The second side wall member 30 configured as above is slid inward in the horizontal direction (width direction) as shown in FIG. 6. Here, a pulling jig 100 for pulling the second side wall member 30 inward may be used. 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 this time, the reinforcing bar 82 is inserted into the sleeve 84, and the gap of the sleeve 84 is filled with a time-curing material in this state, thereby performing the connection. Also, the reinforcing bar 86 is inserted into the sleeve 88, and the gap of the sleeve 88 is filled with a time-curing material in this state, thereby performing the connection. In this manner, the protrusion 32 connects to the first top plate member 50 and the protrusion 34 connects to the first bottom plate member 60, thereby connecting the second side wall member 30 to the first top plate member 50 and the first bottom plate member 60.

[0040] In addition, the process of connecting the second side wall member 30 to the first top plate member 50 and the first bottom plate member 60, described with reference to Figure 6 in this specification, may be referred to as the "second side wall connecting process."

[0041] Similarly, the third side wall member 40 configured as above is slid inward in the horizontal direction (width direction) as shown in FIG. 6. At this time, the same pulling jig 100 as 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 this 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 this state, thereby performing the connection. Also, 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 this state, thereby performing the connection. 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, thereby the third side wall member 40 is connected to the second top plate member 52 and the second bottom plate member 62.

[0042] In addition, the process of connecting the third side wall member 40 to the second top plate member 52 and the second bottom plate member 62, described with reference to Figure 6 in this specification, may be referred to as the "third side wall connecting process."

[0043] 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 a bottom plate portion 3 laid on the ground so as to include a first bottom plate member 60 and a second bottom plate member 62, a side wall portion 5 constructed vertically to the bottom plate portion 3 and consisting of each side wall member 20, 30, 40, and a 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.

[0044] <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.

[0045] 8 is a schematic enlarged view of the pulling jig 100. Here, as an example, a case is shown in which the pulling jig is used when connecting the connecting surface of the first top plate member 50 and the connecting surface of the protruding portion 32. That is, FIG. 8 is a schematic enlarged view of the dashed line portion shown in FIG.

[0046] As shown in Fig. 8, the pulling jig 100 includes a guide member 102 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 fixed to the guide member 102, a holding portion 106 fixed to the pulling side member, and a chain 107 stretched between them. A winding portion 110 for winding up the stretched chain 107 is provided between the holding portion 105 and the holding portion 106.

[0047] The guide member 102 is disposed between the object to be pulled (hereinafter, the overhanging portion 32) and the member on the pulling side (hereinafter, the first top plate member 50), and with the guide member 102 and the overhanging portion 32 connected, the winding portion 110 is driven to wind up the chain 107. In the first top plate member 50, the guide member 102 is configured to be freely movable by the wheels 104, and the overhanging portion 32 slides horizontally (widthwise) via the guide member 102 as the chain 107 is wound up.

[0048] By using the pulling jig 100 configured in this manner 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.

[0049] <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 for a process of assembling and integrating multiple components on a frame in advance, which avoids the need to secure a yard for constructing an 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.

[0050] Fig. 9 is an explanatory diagram showing an example of a conventional construction method for a box culvert. 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 Fig. 9, a side wall portion 200 and a deck portion 201 are first installed as an integrated unit, and a top plate member 210, which is an integrated construction of multiple components, is hung from above and installed. In Fig. 9, the top plate member 210 is configured with a corner portion, and multiple components are assembled in an assembly yard near the construction site.

[0051] In the method for constructing the box culvert 1 according to this embodiment, it is not necessary to secure a place such as a yard for assembling the top plate member 210 composed of a plurality of members as shown in FIG. 9 in advance. In addition, in the case of the conventional construction method, when combining and integrating a plurality of members, an integration process involving filling mortar or the like may be performed at the joints between the members. When the top plate member 210, which is an integrated piece of a plurality of members, is hung and installed, bending acts on 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 may lengthen the construction period, but in this respect, the construction period can be shortened by the method for constructing the box culvert 1 according to this embodiment.

[0052] In addition, in the box culvert 1 according to this embodiment, precast members are used as each side wall member, each top plate member, and each bottom plate member, and a plurality of these precast members are combined to construct the box culvert 1. In this way, by using precast members, it is possible to improve the work efficiency during construction and the transportability of the members.

[0053] Although an example of an 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 modified or revised examples within the scope of the ideas described in the claims, and it is understood that these also naturally belong to the technical scope of the present invention.

[0054] In the above embodiment, the box culvert 1 is illustrated and described as having an internal space divided into two by an intermediate wall and two paths laid therein, but the scope of application of the present invention is not limited to this. That is, in the above embodiment, the first side wall 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 side wall member 30 and the third side wall 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, but the configuration of the box culvert 1 is not limited to this.

[0055] 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 wall bodies. 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.

[0056] In the above embodiment, each side wall member is configured by combining two side wall divided members, one above the other, but the configuration of the side wall member is not limited to this. That is, each side wall member may be configured from a single precast member, or may be configured from two or more divided members.

[0057] 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 structure is not limited to the one shown in the figure. For example, in the connection between the connection surface of the first top plate member 50 and the connection surface of the overhanging portion 32, 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 structure may 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.

[0058] In addition, the effects described in this specification are merely explanatory or exemplary and are not limiting. In other words, the technology according to the present disclosure may achieve other effects that are apparent to a person skilled in the art from the description of this specification in addition to or in place of the above effects. [Industrial Applicability]

[0059] The present invention is applicable to a method of constructing a box culvert. [Explanation of symbols]

[0060] 1…Box culvert 3…Bottom plate part 5…Side wall 10…Top plate part 20...First side wall member 20a, 20b...(first side wall member) side wall dividing members 22... (first side wall member upper portion) protruding portion 24...(first side wall member lower part) protruding portion 26…Reinforced concrete 27...Sleeve 28...Sleeve 29…Reinforced concrete 30...Second side wall member 30a, 30b...(second side wall member) side wall dividing members 32...(top of second side wall member) protruding portion 34...(lower part of second side wall member) protruding portion 36…Reinforced concrete 37...Sleeve 40...Third side wall member 40a, 40b...(third side wall member) side wall dividing members 42...(third side wall member upper portion) protruding portion 44...(lower part of third side wall member) protruding portion 46…Reinforced concrete 47…Sleeve 50...First top plate member 52...Second top plate member 55...Sleeve 56…Reinforced concrete 60...First base plate member 62...Second base plate member 70…Shoring 72...Jack 80...Pull-up jig 82…Reinforced concrete 84...Sleeve 86…Reinforced concrete 88...Sleeve 92…Reinforced concrete 94...Sleeve 96…Reinforced concrete 98...Sleeve 100...Pull-up jig 102...Guide member 104...Wheel 105, 106...holding part 107…Chain 110…Winding section G: Installation surface

Claims

1. 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.

2. 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.

3. 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.

4. 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.

5. A method for constructing a box culvert as described in claim 1, characterized in that in the second side wall connecting step, 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 a chain connected to the guide member is 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.

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