JP2001193139A - Multiple box culvert and its assembling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily assemble a factory-produced multiple box culvert at a site. SOLUTION: A lower block 1 and an upper block 2 and side blocks 3 are factory-produced and carried to a site, and the lower block 1 is horizontally installed in a preformed groove. A leg wall 2d of the upper block 2 is put on a supporting wall 1d of the lower block 1 to make the upper block 2 stand by itself on the lower block. Joint fittings 7, 17 for the supporting wall 1d and the leg wall 2d are joined via a joint 12 to combine both blocks 1, 2 in one unit. Then, the side blocks 3 are installed beside the lower block 1 and the upper block 2 to be made to stand by itself in the groove via a lower plate 3b. Joint fittings 36, 16 for an upper plate 3c and a top plate 2a are joined via a joint 12 and joint fittings 26, 6 for the lower plate 3b and a bottom plate 1a are joined via the joint 12 to combine the side blocks 3 with both blocks 1, 2 in one unit. No support at a site is required.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an assembling type multiple box culvert buried underground as a common ditch and a method of assembling the same.

[0002]

2. Description of the Related Art Box culverts have a large cross section when they are of a multiple type, and cannot be precast because they cannot be transported to a site produced in a factory or the like. For this reason, the construction of cast-in-place concrete has been forced.

[0003]

The construction of a box culvert by cast-in-place requires, of course, the transport and removal of various materials such as formwork to the site, as well as the weather and traffic conditions. Since it is easily affected, there is a problem that labor and time are inevitably required and the cost is increased.

The above problem can be solved by precasting the box culvert by assembling the box culvert. However, a general dividing method requires extensive support of the dividing member, and requires much labor and time. The cost cannot be reduced by reducing the cost.

An object of the present invention is to provide a multiple box culvert that can be assembled without requiring a large-scale support, and a method of assembling the same. Another object of the present invention is to provide a multiple box culvert capable of obtaining a strong and stable assembly strength and a method for assembling the same. Another object of the present invention is to provide a multiple box culvert and a method for assembling the same, which can reduce the construction cost.

[0006]

In order to achieve at least one of the above-mentioned objects, the invention according to claim 1 has a lower block installed on the ground, and a self-supporting means, and the lower block is provided by the self-supporting means. An upper block mounted on the block and integrally connected to the lower block by a joint; and a side having self-supporting means and installed on the ground and integrally connected to the lower block and the upper block by a joint. And a unit block.

In this means, the upper block is placed on the lower block in a self-standing manner by the self-standing means of the upper block itself, and is integrally connected to the lower block by a joint. In addition, the side blocks are made to stand on the ground using their own self-supporting means, and are integrally connected to the lower block and the upper block with joints. Therefore, it is unnecessary to support the upper block and the side blocks. The lower block, upper block, and side blocks only form part of a multiple box culvert, all of which are smaller in size, so they can be precast, factory-produced, 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] In the multiple box culvert according to the first aspect, the lower block includes a bottom plate, and a support wall vertically provided on an upper surface of the bottom plate, and the upper block includes:
A top wall, and a leg wall as a self-supporting means which is provided vertically to a lower surface of the top plate, is supported by a support wall of the lower block, and is integrally connected by a joint, and the side block includes:
A side wall, a lower plate horizontally provided at a lower end of the side wall and abutting against a bottom plate of the lower block and integrally connected by a joint, and the upper block horizontally provided at an upper end of the side wall And an upper plate which is in contact with the top plate and is integrally connected by a joint. In this configuration, the upper block is made to stand on the support wall of the lower block by the leg wall and joined together by joints, and the side blocks are made to stand on the ground by the lower board and the lower board and the bottom of the lower block And the upper plate and the top plate of the upper block are integrally connected by a joint.

In the above assembled state, the bottom plate of the lower block, the top plate and the side blocks of the upper block usually constitute the outer wall of the multiple box culvert, and the support wall of the lower block, the leg wall of the upper block and Constitutes a partition, but when only one side block is used, the outer support wall and the leg wall act as outer walls. The number of support walls of the lower block and the number of leg walls of the upper block are usually two or more, but may be one. Although the number of support walls and the number of leg walls are generally substantially the same, it is also possible to formally change the numbers.

[0010] In the multiple box culvert according to the second aspect, it is preferable that the outer corners of the lower plate and the side wall of the side block are inclined surfaces having a lower constriction.
With this configuration, corners can be prevented from being chipped due to impact or the like, and soil can be easily backfilled under 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 the second or third aspect, through holes are formed in the bottom plate of the lower block, the top plate of the upper block, and the lower plate and the upper plate of the side block, respectively. (Claim 4). In this configuration, a PC steel material is inserted through the through holes of the bottom plate of the lower block and the lower plate of the side block, and a PC steel material is inserted through the insertion holes of the top plate of the upper block and the upper plate of the side block. Prestress PC steel. Thereby, the assembling strength of the side block, the lower block, and the upper block is increased.

In the multiple box culvert according to any one of claims 1 to 4, the connecting position of the side block, the lower block, and the upper block may be a position where the bending moment is zero or close thereto. Preferred (claim 5). In this configuration, only the shearing force needs to be considered at the joint between the side block, the lower block, and the upper block.

The invention according to claim 6 is the invention according to claims 1 to 5
A method for assembling a multiple box culvert according to any one of the above, wherein a step of installing a lower block on the ground, a step of placing an upper block on the lower block, A step of installing on the ground, a step of integrally connecting the lower block and the upper block by a joint, a step of integrally connecting the lower block and the side block by a joint, and an upper block and a side block. And a step of integrally joining with a joint.

According to this means, the multiple block culvert can be assembled by connecting the lower block, the upper block, and the side blocks reasonably and simply without requiring any support.

In the method for assembling a multiple box culvert according to a fourth aspect of the present invention, in addition to the steps described in the sixth aspect, a PC steel material is inserted into the through hole in the bottom plate of the lower block and the through hole in the lower plate of the side block. Preferably, the method further comprises a step of inserting a PC steel material into the insertion hole of the top plate of the upper block and the insertion hole of the upper plate of the side block and applying a prestress to the PC steel material. . In this configuration, the assembling strength of the lower block, the upper block, and the side blocks is enhanced by the PC steel.

[0016]

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 comprises a lower block 1, an upper block 2, and side blocks 3, 3 made of reinforced concrete.

The lower block 1 is provided with support walls 1d, 1d vertically provided on the upper surface of a horizontal bottom plate 1a.
e, while connecting metal fittings 6 and 7 are provided on the left and right end surfaces of the bottom plate 1a in FIG. 1 and the end surface of the support wall 1d, respectively, and are connected to the front and rear end surfaces (in the direction perpendicular to the paper surface in FIG. It is manufactured with metal fittings 8 provided. Insertion hole 1e is PC steel 1
0 is inserted, and both ends are opened at both ends of the bottom plate 1a, respectively, and the center portion is formed to be slightly higher than both ends.

The upper block 2 is provided with leg walls 2d, 2d vertically on the lower surface of a horizontal top plate 2a, and an insertion hole 2f is formed in the top plate 2a.
While the left and right end faces of the top plate 2a in FIG.
d, fittings 16 and 17 are provided on the end face, respectively.
It is manufactured by providing connecting metal fittings 18 on the front and rear end faces of the top plate 2a. The insertion holes 2f allow the PC steel material 11 to pass therethrough, and have both ends opened at both ends of the top plate 2a, respectively, and have a central portion slightly lower than both ends.

The leg wall 2d of the upper block 2 is formed at the same position and the same width as the support wall 1d of the lower block 1, and is mounted on the support walls 1d of the lower block 1 to serve as self-supporting means. The upper block 2 functions stably and independently on the support walls 1d, 1d of the lower block 1 so as to function. The upper block 2 connects the joints 7 and 17 to the joint 1 in this self-standing state (mounted state).
2 and integrally connected to the lower block 1.

The side block 3 is provided with a lower plate 3b and an upper plate 3c horizontally on one side of a lower end and an upper end of a vertical side wall 3a, and an insertion hole 3 formed in the lower plate 3b and the upper plate 3c.
e and 3f are formed, respectively, while fittings 26 and 36 are provided on the end faces of the lower board 3b and the upper board 3c, respectively, and fittings 28 are provided on the front and rear end faces of the side wall 3a.

The lower board 3b of the side block 3 functions as a self-supporting means so that the side block 3 can stand on the ground G independently. Lower panel 3b and upper panel 3
c is equal to the bottom plate 1a of the lower block 1 in the combined state.
And the top plate 2a of the upper block 2 is made to coincide with the vertical space, and the thickness of the lower plate 3b and the upper plate 3c is set to the bottom plate 1a.
And the thickness of the top plate 2a.

The side block 3 is connected to the joint 6 of the lower block 1 and the joint 16 of the upper block 2 by the joint 2.
6, 36 are respectively connected by the joint 12, while the insertion hole 1e of the lower block 1 and the insertion holes 3e, 3b of the lower panels 3b, 3b.
3e, the PC steel material 10 is inserted, and the insertion holes 2f of the upper block 2 and the insertion holes 3f, 3 of the upper panels 3c, 3c are inserted.
f through which the PC steel material 11 is inserted.
By applying a prestress to the lower block 11, the lower block 1 and the upper block 2 in the connected state are integrally connected.

The outer corner of the side wall 3a of the side block 3 and the outer corner of the lower plate 3b are formed as a sloping inclined surface 3g.
The outer corner of the upper board 3c is an arc surface 3h.
The joining fittings 8, 18, and 28 are used to join the multiple box culverts A, A with the joint 12 in a direction perpendicular to the paper surface in FIGS. 1 and 2 (vertical direction in FIG. 3, and horizontal direction in FIG. 4). Things.

The joint 12 is, as shown in FIG.
It consists of 2a and nut 12b, but joints of other constructions can be used. In the left side block 3 and the right side block 3 in FIG. 1 and the like, side blocks having the same structure are used with different right and left sides. Reference numeral 14 denotes the lower block 1
And the reinforcing bars buried in the upper block 2 and the side blocks 3.

The joint position of the bottom plate 3a of the lower block 1 and the lower plate 3b of the side block 3 by the joint 12 and the joint position of the top plate 2a of the upper block 2 and the upper plate 3c of the side block 3 by the joint 12 are as follows. Preferably, it is set to a position where the bending moment becomes zero or a position close thereto (see the bending moment diagram in FIG. 9).

The multiple box culvert A having the above-described structure is produced at the factory by producing the lower block 1, the upper block 2, and the side blocks 3 and transported to the construction site. The lower block 1 is set horizontally on the upper side (FIG. 5).

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 stands on the lower block 1 by itself, and immediately the support wall 1d and the leg wall 2d.
The lower metal block 1 and the upper metal block 2 are integrally connected to each other with the joints 12 and 17 by the joint 12 (FIG. 6).

Next, the side block 3 is installed beside the lower block 1 and the upper block 2 and is self-supported by the lower plate 3b on the ground of the groove, and immediately the metal fittings 36 for the upper plate 3c and the top plate 2a are connected. 16 are connected to each other by the joint 12, and the joints 26 and 6 of the lower panel 3b and the bottom panel 1a are connected to each other by the joint 12 to integrally connect the side block 3 to the lower block 1 and the upper block 2 (FIG. 7, FIG. 1).

After the completion of the assembling operation, the insertion holes 1e and 1e of the bottom plate 1a of the lower block 1 and the lower plate 3b of the side block 3 are formed.
3e, 3e, and PC steel materials 10, 11 are inserted into the through holes 2f, 3f, 3f of the top plate 2a of the upper block 2 and the upper plate 3c of the side block 3, respectively, to apply prestress (FIGS. 1 to 10). 4).

The multiple box culverts A, A adjacent before and after (in FIG. 4, right and left) assembled in this manner are:
The coupling fittings 8, 8 and the coupling fittings 18, 18 and the coupling fittings 28, 28 are respectively coupled by the joint 12 to be integrally connected.

Finally, the excavated soil is back-filled on the multiple box culvert A to complete the construction of the multiple box culvert. At this time, the corner of the side wall 3a of the side block 3 and the corner of the lower panel 3b are formed as a slope 3g with a downward constriction, so that the soil easily enters underneath. Therefore, it is possible to prevent trouble caused by the clearance.

The bending moment applied to the central portion of the upper block 2 of the multiple box culvert A is directed downward as shown in FIG. 9 and the bending moment applied to the central portion of the lower block 1 is directed upward as shown in FIG. So on P
Since the central portion of the C 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 bottom plate 1a and the top plate 2
The thickness of a can be reduced to reduce the weight.

The procedure for assembling the multiple box culvert A is not limited to the above.
The upper block 2 is free standing on the upper side, and the side blocks 3 are free standing on the side thereof. Then, they are connected by the joint 12 or the lower blocks 1, 1 are assembled before the multiple box culvert A is assembled. The upper block 2,
2 or the side blocks 3 and 3
May be joined back and forth. In addition, PC steel 1
In some cases, the side blocks 3 are connected to the lower block 1 and the upper block 2 by the joints 12 after prestressing 0 and 11.

The connection fittings 8, 18, and 28 are provided on the front and rear surfaces of the lower block 1, the upper block 2, and the side blocks 3, respectively. In addition, the coupling brackets 6, 7, 16, 1
7, 26, and 36 are arranged in parallel in the front-rear direction of the lower block 1, the upper block 2, and the side blocks 3. Joint fittings 6, 7, 8, 16, 17, 18, 26, 28, 36
The position of the equipment is not limited to the one shown in the figure, and is arbitrary. In particular, in the case of the coupling brackets 6, 7, 16, 17, 26, and 36, the lower and upper blocks 2 and the side blocks 3 are exposed at the front and rear end faces. It may be provided at a position where it does not. Further, the number of PC steel materials 10 and 11 is not limited to the number shown in the figure, and is five or less.
Alternatively, it can be seven or more.

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 these dimensions. Of course, it can be small.

[0036]

As described above, according to the first aspect of the present invention, the lower block, the upper block, and the side blocks are factory-produced, transported to the site, and assembled efficiently without the need for support. Thus, it is possible to provide a multiple box culvert that can reduce labor and time on site and is inexpensive.

In the multiple box culvert according to the second aspect of the present invention, the leg wall of the upper block and the lower panel of the side block function as self-supporting means, so that the whole structure is simplified and the cost is further reduced. Become.

In the multiple box culvert according to the third aspect of the present invention, since the soil can be obliquely and linearly applied to the soil under the inclined surface, the soil is uniformly spaced below the inclined surface. It can be easily backfilled without any occurrence, and it is possible to prevent trouble caused by clearance.

In the multiple box culvert according to the fourth aspect, the assembling strength of the side block, the lower block and the upper block can be strengthened by the PC steel material, and therefore, the bottom of the lower block and the top of the upper block. And the like can be made thinner to reduce the weight, and the cost can be further reduced.

In the multiple box culvert according to the fifth aspect, the joint between the side block, the lower block and the upper block only needs to consider the shearing force, and simple connection with the bolt and nut is possible. become. Therefore, workability is improved.

According to the sixth aspect of the present invention, the lower block, the upper block, and the side blocks are connected reasonably and integrally without requiring a support, and the multiple box culvert is reduced in labor. It can be assembled efficiently, quickly and accurately.

In the method for assembling a multiple box culvert according to the present invention, since the assembly strength of the multiple box culvert is strengthened by the PC steel, the thickness of the lower block, the upper block, and the side blocks is reduced. Thus, the weight can be reduced.

[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 an arrangement structure (left half) of a reinforcing steel bar and an insertion structure (right half) of a PC steel material of the multiple box culvert of FIG. 1;

FIG. 3 shows the reinforcing bars and P of the multiple box culvert of FIG.
It is a top view which shows the arrangement structure of C steel material.

FIG. 4 is also a side view.

FIG. 5 is a front view of a lower block.

FIG. 6 is a front view showing a combined state of a lower block and an upper block.

FIG. 7 is a front view showing a connection state of a lower block, an 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 shown in FIG. 1;

[Explanation of symbols]

A Multiple box culvert G Ground 1 Lower block 1a Bottom 1d Support wall 1e, 2f,
3e, 3f Insertion hole 2 Upper block 2a Top 2d Leg wall (self-supporting means) 3 Side block 3a Side wall 3b Lower board (self-supporting means) 3c Upper board 3g Inclined surface 6,7,8,16,17,18,26 , 28,36 Joint fitting 10,11 PC steel 12 Joint 14 Reinforcing bar

Claims (7)

[Claims] A lower block installed on the ground, an upper block having self-supporting means, mounted on the lower block by the self-supporting means, and integrally connected to the lower block by a joint; A multiple box culvert, comprising: a side block installed on a ground having means and integrally connected to the lower block and the upper block by a joint. 2. The lower block includes a bottom plate and a support wall provided vertically on an upper surface of the bottom plate. The upper block includes a top plate and the lower block provided vertically on a lower surface of the top plate. And a leg wall as a self-supporting means supported by the support wall and integrally connected by a joint. The side block has a side wall and a bottom wall of the lower block provided horizontally at a lower end of the side wall. A lower panel as a self-supporting means that is in contact with and integrally connected by a joint, and an upper panel that is provided horizontally at an upper end of the side wall and abuts on the top of the upper block and is integrally connected by a joint. 2. The multiple box culvert according to claim 1, wherein: 3. The 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 inclined surfaces having a downward constriction. 4. A PC steel insertion hole is formed in each of a bottom plate of a lower block, a top plate of an upper block, and lower and upper plates of a side block. Multiple box culvert. 5. The combination of a side block, a lower block, and an upper block, wherein a bending moment is zero or close thereto.
A multiple box culvert according to any one of the above. 6. The method for assembling a multiple box culvert according to claim 1, further comprising: installing a lower block on a ground; and mounting an upper block on the lower block. Placing the step, placing the side block on the ground, connecting the lower block and the upper block together with a joint, and connecting the lower block and the side block together with a joint And a step of integrally connecting the upper block and the side blocks by a joint. A method for assembling a multiple box culvert. 7. The method for assembling a multiple box culvert according to claim 4, wherein, in addition to the steps described in claim 6, an insertion hole in the bottom plate of the lower block and an insertion hole in the lower plate of the side block. And a step of applying a PC steel material to the insertion hole of the top block of the upper block and the insertion hole of the upper panel of the side block to apply a prestress to the PC steel material. To assemble multiple box culverts.