JP4271324B2 - Multiple box culvert and its assembling method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an assembly-type multiple box culvert embedded in the ground as a common groove and an assembly method thereof.
[0002]
[Prior art]
A box culvert has a large cross section when it is a multiple form, and since it cannot be transported to the site, it cannot be precast. For this reason, construction by on-site casting of concrete is forced.
[0003]
[Problems to be solved by the invention]
Building a box culvert on site requires, of course, the introduction and removal of various materials, such as formwork, and is easily affected by the weather and traffic conditions. There is a problem that it takes time and is expensive.
[0004]
If the box culvert is assembled and precasted, the above problems can be solved. However, the general division method requires a large support for the divided members, reducing labor and time. Cost cannot be reduced.
[0005]
An object of the present invention is to provide a multiple box culvert that can be assembled without requiring a large support work and an assembling method thereof.
Another object of the present invention is to provide a multiple box culvert capable of obtaining a strong and stable assembly strength and an assembling method thereof.
Another object of the present invention is to provide a multiple box culvert and its assembling method that can reduce the construction cost.
[0006]
[Means for Solving the Problems]
In order to achieve at least one of the above objects, the invention according to claim 1 includes a lower block installed on the ground, and a self-supporting means, and is placed on the lower block by the self-supporting means. An upper block that is integrally coupled to the lower block by a joint, and a side block that has self-supporting means and that is installed on the ground and is integrally coupled to the lower block and the upper block by a joint. .
[0007]
In this means, the upper block is placed on the lower block in a self-supporting state by self-supporting means, and is integrally coupled to the lower block by a joint. Further, the side block is self-supported on the ground using its own self-supporting means, and is integrally coupled to the lower block and the upper block by a joint. Therefore, support work for the upper block and the side block is not required.
The lower block, the upper block, and the side block constitute only a part of the multiple box culvert, and since all of them are small in shape, they can be precast and produced in the factory and transported to the site. .
The number of lower blocks, upper blocks, and side blocks is not limited to one, and may be two or more.
[0008]
2. The multiple box culvert according to claim 1, wherein the lower block includes a bottom plate and a support wall provided perpendicular to the upper surface of the bottom plate, and the upper block is provided on the top plate and the lower surface of the top plate. A leg wall as a self-supporting means that is vertically provided and supported by a support wall of the lower block and is integrally joined by a joint, and the side block is provided horizontally on the side wall and the lower end of the side wall. The lower plate as a self-supporting means that is brought into contact with the bottom plate of the lower block and integrally joined with a joint, and the upper plate of the upper block that is provided horizontally at the upper end of the side wall and joined integrally with the joint It can be set as the structure provided with the upper board by which it is made (claim 2).
In this configuration, the upper block is self-supporting on the support wall of the lower block with the leg wall and joined together by a joint, and the side block is self-supporting on the ground with the lower panel, and the bottom panel of the lower and lower blocks Are joined together by a joint, and the top board and the top board of the upper block are joined together by a joint.
[0009]
In the above assembled state, the bottom block of the lower block, the top plate and the side block of the upper block usually constitute the outer wall of the multiple box culvert, and the support wall of the lower block and the leg wall of the upper block form a partition. Although configured, when only one side block is used, the outer support and leg walls act as outer walls. The number of support walls of the lower block and the leg walls of the upper block are usually two or more, but may be one. The number of support walls and the number of leg walls are usually substantially the same, but can be different in number.
[0010]
In the multiple box culvert according to claim 2, it is preferable that the outer corners of the lower disk and the side wall of the side block have a sloping inclined surface (claim 3).
In this configuration, it is possible to prevent the corners from being lost due to an impact or the like, and it is easy to backfill the soil below the inclined surface with a uniform density as compared with the case of the R shape (arc shape).
[0011]
In the multiple box culvert according to claim 2 or 3, it is preferable to form PC steel insertion holes in the bottom plate of the lower block, the top plate of the upper block, the lower plate and the upper plate of the side block, respectively. (Claim 4).
In this configuration, the PC steel material is inserted into the insertion holes of the bottom plate of the lower block and the lower plate of the side block, and the PC steel material is inserted into the insertion holes of the top plate of the upper block and the upper plate of the side block. Prestress is applied to PC steel. This increases the assembly strength of the side block, the lower block, and the upper block.
[0012]
In the multiple box culvert according to any one of claims 1 to 4, it is preferable that the connecting position of the side block, the lower block, and the upper block is a position where the bending moment is zero or close to this (claim) Item 5).
In this configuration, only the shearing force needs to be taken into consideration at the connecting portion of the side block, the lower block and the upper block.
[0013]
The invention described in claim 6 is the assembly method of the multiple box culvert according to any one of claims 1 to 5, wherein the lower block is installed on the ground, and the lower block is placed on the lower block. The step of placing the upper block, the step of installing the side block on the ground, the step of integrally connecting the lower block and the upper block by a joint, and the lower block and the side block by a joint It was set as the structure which comprised the process which couple | bonds, and the process of couple | bonding an upper block and a side part block integrally by a coupling.
[0014]
With this means, the lower block, the upper block, and the side block can be assembled together by reasonably and skillfully and integrally without requiring a support work.
[0015]
In the method for assembling the multiple box culvert according to claim 4, in addition to each step according to claim 6, the PC steel material is inserted through the insertion hole of the bottom plate of the lower block and the insertion hole of the lower plate of the side block. Preferably, the method includes a step of prestressing the PC steel materials by inserting the PC steel materials through the insertion holes of the top block of the upper block and the insertion holes of the upper plate of the side block.
In this configuration, the assembly strength of the lower block, the upper block, and the side block is reinforced by the PC steel material.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the accompanying drawings.
1 to 7 show an embodiment of a multiple box culvert according to the present invention. The multiple box culvert A is composed of a lower block 1, an upper block 2 and side blocks 3 and 3 made of reinforced concrete.
[0017]
The lower block 1 has support walls 1d and 1d provided vertically on the upper surface of a horizontal base 1a, and an insertion hole 1e is formed in the base 1a, while being coupled to the left and right end faces of FIG. 1 of the base 1a and the end face of the support wall 1d. The metal fittings 6 and 7 are provided, respectively, and the coupling metal fitting 8 is provided on the front and back of the bottom board 1a (in the direction perpendicular to the paper surface in FIG. 1). The insertion hole 1e allows the PC steel material 10 to be inserted, and both ends thereof are opened at both end portions of the bottom plate 1a, and the center portion is formed slightly higher than both ends.
[0018]
The upper block 2 is provided with leg walls 2d, 2d vertically on the lower surface of the horizontal top board 2a, and through holes 2f are formed in the top board 2a. On the other hand, the left and right end surfaces of the top board 2a and the leg walls 2d are shown in FIG. The joint metal fittings 16 and 17 are provided on the end faces, respectively, and the joint metal fitting 18 is provided on the front and rear end faces of the top board 2a. The insertion hole 2f is for inserting the PC steel material 11, and both ends thereof are opened at both end portions of the top board 2a, and the center portion is formed slightly lower than both ends.
[0019]
The leg wall 2d of the upper block 2 is formed at the same position and with the same width as the support wall 1d of the lower block 1, and is placed on the support walls 1d, 1d of the lower block 1 to function as a self-supporting means. The upper block 2 can be made to stand on the support walls 1d and 1d of the lower block 1 stably. The upper block 2 is integrally coupled to the lower block 1 by coupling the fittings 7 and 17 with the joint 12 in this self-standing state (mounted state).
[0020]
The side block 3 is horizontally provided with a lower board 3b and an upper board 3c on one side of a lower end and an upper end of a vertical side wall 3a, and through holes 3e and 3f are formed in the lower board 3b and the upper board 3c, respectively. On the other hand, it is manufactured by providing the fittings 26 and 36 on the end faces of the lower board 3b and the upper board 3c, and providing the fittings 28 on the front and rear end faces of the side wall 3a.
[0021]
The lower board 3b of the side block 3 works as a self-supporting means so that the side block 3 can stand on the ground G. The vertical gap between the lower board 3b and the upper board 3c is made to coincide with the vertical gap between the bottom board 1a of the lower block 1 and the top board 2a of the upper block 2 and the thickness of the lower board 3b and the upper board 3c is the bottom board. It is made the same with the thickness of 1a and the top board 2a.
[0022]
The side block 3 connects the coupling brackets 26 and 36 to the coupling bracket 6 of the lower block 1 and the coupling bracket 16 of the upper block 2 with the joint 12, respectively, while the insertion hole 1e of the lower block 1 and the lower boards 3b and 3b The PC steel material 10 is inserted into the insertion holes 3e and 3e, and the PC steel material 11 is inserted into the insertion holes 2f of the upper block 2 and the insertion holes 3f and 3f of the upper panels 3c and 3c. By applying stress, the lower block 1 and the upper block 2 in a coupled state are integrally coupled.
[0023]
The outer corners of the side wall 3a and the lower board 3b of the side block 3 are inclined down surfaces 3g, and the outer corners of the side wall 3a and the upper board 3c are arcuate surfaces 3h.
The coupling brackets 8, 18, and 28 are used for coupling the multiple box culverts A and A with the joint 12 in the direction perpendicular to the paper surface in FIGS. 1 and 2 (vertical direction in FIG. 3 and horizontal direction in FIG. 4). Is.
[0024]
As shown in FIG. 8, the joint 12 is composed of a bolt 12a and a nut 12b, but joints of other structures can be used. A side block having the same structure is used for the left side block 3 and the right side block 3 in FIG. Reference numeral 14 denotes a reinforcing bar embedded in the lower block 1, the upper block 2, and the side block 3.
[0025]
The joint position of the bottom board 3a of the lower block 1 and the lower board 3b of the side block 3 by the joint 12 and the joint position of the top board 2a of the upper block 2 and the joint 12 of the upper board 3c of the side block 3 are preferably bent. The position at which the moment becomes zero or a position close thereto (see the bending moment diagram in FIG. 9).
[0026]
The multiple box culvert A having the above-described configuration is produced by factory-producing the lower block 1, the upper block 2 and the side block 3 to the construction site. Block 1 is installed horizontally (FIG. 5).
[0027]
Next, the leg wall 2d of the upper block 2 is placed on the support wall 1d of the lower block 1 so that the upper block 2 is self-supported on the lower block 1, and the coupling brackets 7 and 17 of the support wall 1d and the leg wall 2d are immediately connected to each other. The lower block 1 and the upper block 2 are joined together by a joint 12 (FIG. 6).
[0028]
Next, the side block 3 is placed beside the lower block 1 and the upper block 2 and is self-supported by the lower board 3b on the ground of the groove. Immediately, the coupling brackets 36, 16 of the upper board 3c and the top board 2a are connected to each other. In addition to the coupling 12, the couplings 26, 6 of the lower panel 3 b and the bottom panel 1 a are coupled to each other by the coupling 12 to integrally couple the side block 3 to the lower block 1 and the upper block 2 (FIGS. 7 and 7). 1).
[0029]
After completion of the above assembling work, the insertion holes 1e, 3e, 3e of the bottom board 1a of the lower block 1 and the lower board 3b of the side block 3, and the top board 2a of the upper block 2 and the upper board 3c of the side block 3 are inserted. The PC steel materials 10 and 11 are inserted into the holes 2f, 3f, and 3f, respectively, and prestress is applied (FIGS. 1 to 4).
[0030]
The multiple box culverts A and A adjacent to each other before and after the assembly in this way (left and right in FIG. 4) connect the coupling metal fittings 8 and 8, the coupling metal fittings 18 and 18, and the coupling metal fittings 28 and 28 to the joint 12. Are connected to each other and connected together.
[0031]
Finally, the excavated soil is backfilled on the multiple box culvert A to complete the construction of the multiple box culvert. At this time, the side walls 3a of the side blocks 3 and the corners of the lower board 3b are formed as inclined surfaces 3g with a narrowed bottom, so that the soil can easily enter below, so that the soil is refilled with a uniform density without causing perforation. It is possible to prevent troubles caused by clearing.
[0032]
The bending moment applied to the center of the upper block 2 of the multiple box culvert A is downward as shown in FIG. 9, and the bending moment applied to the center of the lower block 1 is upward, but as shown in FIG. Since the central portion of the PC steel material 11 is bent downward and the central portion of the lower PC steel material 10 is bent upward, a large proof stress can be obtained. For this reason, the thickness of the bottom board 1a and the top board 2a can be reduced to reduce the weight.
[0033]
The assembly procedure of the multiple box culvert A is not limited to the above. For example, after the upper block 2 is self-supporting on the lower block 1 and the side block 3 is self-supporting on the side, the joint 12 is used. Before they are assembled, or before the multi-box culvert A is assembled, the lower blocks 1 and 1 or the upper blocks 2 and 2 or the side blocks 3 and 3 are joined back and forth by the joint 12 Sometimes. In some cases, the pre-stress is applied to the PC steel materials 10 and 11, and the side block 3, the lower block 1, and the upper block 2 are coupled by the joint 12.
[0034]
The fittings 8, 18, and 28 are provided on the front and back surfaces of the lower block 1, the upper block 2, and the side block 3, respectively. A plurality of coupling fittings 6, 7, 16, 17, 26, 36 are arranged in parallel in the front-rear direction of the lower block 1, the upper block 2, and the side block 3. The installation positions of the coupling fittings 6, 7, 8, 16, 17, 18, 26, 28, 36 are not limited to those shown in the figure, and in particular, in the case of the coupling fittings 6, 7, 16, 17, 26, 36. The lower block 1, the upper block 2, and the side block 3 may be provided at positions where they are not exposed on the front and rear end faces. Moreover, the number of the PC steel materials 10 and 11 is not limited to that shown in the figure, and may be 5 or less, or 7 or more.
[0035]
For reference, the multiple box culvert A shown in the figure has a width of 10 m10 cm and a height of 4 m15 cm, but is not limited to this dimension, and is smaller and smaller than this. Needless to say, there are cases.
[0036]
【The invention's effect】
As described above, according to the invention described in claim 1, the lower block, the upper block, and the side block can be produced at the factory and can be efficiently assembled without requiring support work. It is possible to provide a multi-box culvert that can reduce the labor and time of the machine and is low in cost.
[0037]
In the multiple box culvert according to the second aspect, since the leg wall of the upper block and the lower panel of the side block function as self-supporting means, the rational structure is simplified and the cost is further reduced.
[0038]
In the multiple box culvert according to claim 3, since the force can be applied obliquely and linearly to the soil under the inclined surface, the soil is not evenly perforated with a uniform density under the inclined surface. It can be easily backfilled, and can prevent troubles caused by clearing.
[0039]
In the multiple box culvert according to claim 4, the assembly strength of the side block, the lower block, and the upper block can be strengthened by the PC steel material, and accordingly, the bottom block of the lower block, the top plate of the upper block, etc. The thickness can be reduced to reduce the weight, and the cost can be further reduced.
[0040]
In the multiple box culvert according to the fifth aspect of the present invention, only the shearing force needs to be considered in the connecting portion of the side block, the lower block, and the upper block, and a simple connection using a bolt and a nut becomes possible. Therefore, workability is improved.
[0041]
According to the invention described in claim 6, the lower block, the upper block, and the side block are combined together reasonably and skillfully without the need for support work, and the multiple box culvert can be efficiently performed with less labor. It can be assembled quickly and accurately.
[0042]
In the assembly method of the multiple box culvert according to claim 7, the assembly strength of the multiple box culvert is reinforced by the PC steel material, so that the thickness of the lower block, the upper block and the side block is reduced and light weight is achieved. Can be realized.
[Brief description of the drawings]
FIG. 1 is a front view showing an embodiment of a multiple box culvert according to the present invention.
FIG. 2 is a diagram showing a reinforcing bar arrangement structure (left half) and a PC steel material insertion structure (right half) of the multiple box culvert of FIG. 1;
3 is a plan view showing an arrangement structure of reinforcing bars and PC steel materials of the multiple box culvert of FIG. 1. FIG.
FIG. 4 is a side view of the same.
FIG. 5 is a front view of a lower block.
FIG. 6 is a front view showing a coupled state of the lower block and the upper block.
FIG. 7 is a front view showing a coupled state of the lower block, the upper block, and one left side block.
FIG. 8 is a view showing an example of a joint.
FIG. 9 is a bending moment diagram of the multiple box culvert of FIG. 1;
[Explanation of symbols]
A Multiple box culvert G Ground 1 Lower block 1a Bottom plate 1d Support wall 1e, 2f, 3e, 3f Insertion hole 2 Upper block 2a Top plate 2d Leg wall (self-standing means) 3 Side block 3a Side wall 3b Lower plate (self-supporting means) )
3c Upper panel 3g Inclined surface 6,7,8,16,17,18,26,28,36 Joint metal fittings 10, 11 PC steel 12 Joint 14 Reinforcing bar

Claims (7)

A lower block installed on the ground,
An upper block that has self-supporting means and is placed on the lower block by the self-supporting means and is integrally coupled to the lower block by a joint;
A multiple box culvert having a self-standing means and a side block which is installed on the ground and is integrally connected to the lower block and the upper block by a joint. The lower block includes a bottom plate and a support wall provided perpendicular to the upper surface of the bottom plate,
The upper block includes a top plate and a leg wall as a self-supporting means that is provided perpendicularly to the lower surface of the top plate and is supported by the support wall of the lower block and integrally joined by a joint,
The side block includes a side plate, a lower plate that is provided horizontally at the lower end of the side wall, is in contact with the bottom plate of the lower block, and is integrally coupled by a joint, and a horizontal plate at the upper end of the side wall. The multiple box culvert according to claim 1, further comprising: an upper board which is provided on the top board and is brought into contact with a top board of the upper block and is integrally joined by a joint. 3. A multiple box culvert according to claim 2, wherein the outer corners of the lower plate and the side wall of the side block are formed as sloping surfaces. 4. The multiple box according to claim 2, wherein PC steel insertion holes are respectively formed in the bottom plate of the lower block, the top plate of the upper block, and the lower and upper plates of the side block. Calvert. 5. The multiple box culvert according to claim 1, wherein a connecting position of the side block, the lower block, and the upper block is a position where the bending moment is zero or close thereto. A method for assembling a multiple box culvert according to any one of claims 1 to 5,
Installing the lower block on the ground;
Placing the upper block on the lower block;
Installing the side block on the ground;
Connecting the lower block and the upper block together by a joint;
Connecting the lower block and the side block together by a joint;
A method for assembling a multiple box culvert comprising the step of integrally joining the upper block and the side block by a joint. An assembly method for a multiple box culvert according to claim 4,
In addition to the steps described in claim 6, the PC steel material is inserted into the insertion hole of the bottom plate of the lower block and the insertion hole of the lower plate of the side block, and the insertion hole of the top plate of the upper block and the upper portion of the side block A method for assembling a multiple box culvert characterized by including a step of prestressing the PC steel materials by inserting PC steel materials into the insertion holes of the panel.

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