JPH0960099A - Flexible connecting structure in box culvert - Google Patents

Abstract

PROBLEM TO BE SOLVED: To follow displacement caused by land subsidence or the like in order to reduce and rationalize the execution work of a common groove or the like and to reduce execution costs. SOLUTION: A water stop plate 5 capable of following displacement while maintaining a water stopping effect is provided in the connection part of each box culvert 2. The connection of each box culvert 2 is performed by a PC steel bar 6 capable of preventing damaging when the designed displacement amount of the water stop plate 5 is exceeded and following the designing displacement of the water stop plate 5 itself. The connection part is enabled to follow displacement and a connection state is maintained by securing the water stop condition of the box culvert 2 and even when displacement occurs in the connection state, the function of each box culvert 2 as a common groove is maintained. Thus, when each box culvert 2 is installed, the necessity of forming a rigid foundation, performing soil stabilization, attaching a flexible joint to be succeedingly attached or the like is eliminated and the execution work of a common groove or a water pipe is reduced and rationalized and execution costs are reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION This invention relates to the installation of box culverts, which are connected to each other and used for construction of common ditches and sewers, on soft ground where ground subsidence is expected, or when an earthquake occurs. For example, the present invention relates to a flexible connecting structure adopted in the connecting portion of each box culvert when displacement occurs in the connecting portion of each box culvert.

[0002]

2. Description of the Related Art Conventionally, as measures against ground subsidence and displacement caused by earthquakes, etc. in the joint part of precast box culvert used for common trenches and sewers constructed on soft ground, (1) ground subsidence etc. To form a rigid foundation by supporting piles on the constructed ground to prevent the occurrence of (2) to use flexible joints for retrofitting at the connection part of each box culvert to cope with displacement, (3) to subside In order to prevent the occurrence of such problems, three points are generally used to improve the ground structure.

[0003]

[Problems to be Solved by the Invention] However, the above-mentioned (1)
In any of the conventional measures (1) to (3), the following problems remain.

That is, in the case of (1) forming a rigid foundation with a supporting pile, it is necessary to form a rigid foundation with a supporting pile. Therefore, the cross section of the member is increased, the construction cost is increased, and the construction process is prolonged. The problem occurs. In addition, with regard to (2) the flexible joint for retrofitting, there is a problem that it is not possible to cope with thin plate thickness and it becomes expensive, and since it is retrofitting, labor saving in construction is pointed out. There is also a problem.
In addition, for the ground improvement on the constructed ground in (3), the construction cost will increase due to the ground improvement, and
There is a problem that the construction process will be prolonged due to ground improvement.

The present invention was devised in view of the above-mentioned circumstances, and its purpose is to make it possible to follow the displacement caused by ground subsidence or the like, to form a rigid foundation or to improve the ground and to attach a flexible joint for retrofitting. It is an object of the present invention to provide a flexible connecting structure in a box culvert that can eliminate the need for installation and the like, and can realize labor saving and rationalization of construction of common grooves and sewers and reduction of construction cost.

[0006]

According to the connection structure of the present invention, the installation position of each box culvert, which is caused by ground subsidence of the installation ground, an earthquake, etc., is provided at the connection part between the box culverts around the space of each box culvert. A water stop plate that can follow the displacement of the connection part while maintaining the water stop effect of the connection part will be provided. In addition, the connection of each box culvert can suppress the displacement of the water stop plate when it exceeds the design displacement amount of the water stop plate and prevent damage to the water stop plate, and the fixing state of itself can also be adjusted to the design displacement of the water stop plate. PC steel rods that can be followed and maintained will be used.

As described above, according to the present invention, the connection structure having both the water blocking plate and the PC steel rod is provided so that the connection portion of each box culvert can reliably follow the displacement generated due to the ground subsidence or the like. In this way, each box culvert will be kept in a water-stopped state and can be kept connected. Even if displacement occurs due to ground subsidence or the like in the connected state of the box culverts, the function of the box culverts as a common groove or sewer can be maintained.

From the above, according to the connection structure of the present invention, when installing each box culvert, there is no need to form a rigid foundation, perform ground improvement, and attach a flexible joint for retrofitting. Realize labor saving and rationalization of construction and reduction of construction cost when constructing a common ditch or sewer system.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION A flexible connecting structure in a box culvert according to the present invention will be described below with reference to the illustrated embodiment.

A flexible connecting structure 1 (see FIG. 1) used for constructing a common groove, a sewer, etc. by connecting and installing a large number of box culverts 2 having a closed cross section having a space 2a in the center is installed. , Space part 2a of each box culvert 2
Connection part 3 between each box culvert in the surrounding area
In addition, a water stop plate 5 is provided that can follow the displacement of the installation position of each box culvert 2 caused by ground subsidence of the installation ground 4 while maintaining the water stop effect of the connecting portion 3. Further, the connection of the box culverts 2 in the connection structure 1 is performed by the PC steel rod 6.
When the PC steel rod 6 exceeds the designed displacement amount of the water blocking plate 5, the displacement can be suppressed to prevent the water blocking plate 5 from being damaged, and the fixing state of the PC steel rod 6 is also designed by the water blocking plate 5. It is configured so that it can be maintained by a fixing unit that can follow the displacement.

The water stop plate 5 provided at the connecting portion 3 between the box culverts 2 in this embodiment.
As shown in FIG. 2, both box culverts 2 are connected to each other and are integrally molded with both bases 5a embedded in the connection ends of the box culverts 2 to be connected. While blocking the connection part 3 to stop water,
When a displacement occurs in the connecting portion 3, a part of the coupling portion 3 is cut off, and the displacement portion 7 is configured to follow the displacement while maintaining the water stopping effect.

The water stop portion 7 of the water stop plate 5 is
Arch part 7a, which is the main part for stopping water, and this arch part 7a
The linear portion 7b extends linearly from both base portions 5a so as to maintain the arch shape, and the central portion includes a linear portion 7b formed to be cut by displacement.

Ribs 5b for effectively transmitting the stress due to the displacement to the straight line portion 7b of the water stop portion 7 are provided on both base portions 5a of the water stop plate 5. Further, span seals 8 are provided on both bases 5a of the water stop plate 5. The span seal 8 is a non-vulcanized adhesive plastic body using butyl recycled rubber, and has a property of adhering to fresh mortar as the hardening reaction of fresh concrete proceeds. Therefore, both bases 5a can be integrated with concrete, which leads to improvement in water blocking performance.

Each box culvert 2 in this embodiment
The PC steel rod 6 connecting the two is connected to each box culvert 2
Box culverts 2 spanned by the ends
Is fixed to the end portions on the connecting side of the box, and is arranged so as to be able to follow the displacement of the fixing positions of the both ends, that is, the displacement of the installation position of each box culvert 2. That is, the PC steel rod 6 is arranged in a large space, such as the large-diameter sheath tube 9 shown in FIG. 4, and the arrangement position can be freely changed.

Further, at both ends of the PC steel rod 6,
The fixing to the connecting end portion of the box culvert 2 is performed by the special fixing tool 10 configured to keep the fixing state by following the displacement.

As shown in FIG. 4, this special fixing device 10 has
The PC steel rod 6 penetrates through the central portion, and the fixing nut 11 that is tightened to fix the PC steel rod 6 is a biasing device described later.
A hemispherical washer 12 having a flat bearing surface 12a that abuts via 14 and a concave surface portion 13a into which a spherical surface portion 12b of the hemispherical washer 12 fits are formed in the substantially central portion, and a PC steel rod 6
A washer base 13 in which a through hole 13b through which is penetrated is formed in a substantially central portion, a fixing nut 11, and a seat surface 12 of a hemispherical washer 12.
and a biasing device 14 which is interposed between the biasing device 14a and the coil spring 14a. A sliding member 15 is interposed between the spherical surface portion 12b of the hemispherical washer 12 and the concave surface portion 13a of the washer base 13.

Then, by the action of the spherical surface portion 12b of the hemispherical washer 12 and the concave surface portion 13a of the washer base 13 in the special fixing tool 10, the fixing nut 11 abuts via the urging device 14. The bearing surface 12a of 12 can move following the change of the arrangement position of the PC steel rod 6 caused by the displacement. Further, even if the seat surface 12a of the hemispherical washer 12 with which the fixing nut 11 abuts moves as described above, the action of the biasing device 14 having the coil spring 14a built therein causes the fixing nut 12 to move.
The tightening force of 11 can be maintained.

Using the flexible connecting structure 1 of the present invention having such a structure, a common groove, a sewer, etc. are constructed as shown in FIG.
When the box culverts 2 are connected and installed as shown in (a), (c), and (e), when the installation position of each box culvert 2 is displaced due to the fluctuation of the installation ground, The connection part 3 of each box culvert 2 can be dealt with as described below.

That is, when the installation position of each box culvert 2 is displaced as shown in FIG. 1 (d), the linear portion 7b of the water stop portion 7 of the water stop plate 5 is moved as shown in FIG. When the arch portion 7a is cut and deformed, it follows the displacement of the installation position of each box culvert 2 and the arch portion 7a
It is possible to maintain the water-stopping property of the connecting portion 3.

When the installation position of each box culvert 2 is displaced as shown in FIG. 1 (f), the PC steel rod 6 is also arranged at its installation position as shown in FIG.
Thus, it is possible to change the both ends while maintaining the fixation to the box culverts 2, that is, while maintaining the connection state of the box culverts 2.

Therefore, this PC steel rod 6 can follow the displacement of the installation position of each box culvert 2, and the displacement of the installation position of each box culvert 2 above a certain level, for example, of the water stop plate 5. It is possible to prevent displacement exceeding the design displacement amount. From these things, PC steel rod 6
Can prevent the arch portion 7a of the water blocking portion 7 of the water blocking plate 5 from being destroyed even if the installation position of each box culvert 2 is displaced, and also the common groove and the sewer constructed by each box culvert 2 The function of can be maintained.

Each box culvert 2 which employs this flexible connecting structure 1 is manufactured in advance in a factory or the like with the water stop plate 5 attached to the connecting portion 3, and a common groove, sewer or the like is provided. Will be installed at the prescribed locations on the numerous box culverts that are being built. Then, the displacement of the installation ground is absorbed at the installation location of each box culvert 2 that is connected by adopting this flexible connection structure 1. Further, it is also possible to construct a common groove, a sewer, etc., only by the box culverts 2 which are connected by adopting the flexible connection structure 1. Further, the connection between each box culvert 2 that has been connected by adopting this flexible connection structure 1 and another box culvert is performed using a general connection structure.

As described above, in the connection structure 1 of the present invention, the connection structure having both the water stop plate 5 and the PC steel rod 6 is used, so that the connection portion 3 of each box culvert 2 is displaced due to ground subsidence or the like. The box culvert 2 can be surely followed, and the box culverts 2 can be kept in a connected state while ensuring a water-stopped state. This means that even if the box culverts 2 are connected to each other and are displaced due to land subsidence or the like, the function of the box culverts 2 as a common groove or sewer can be maintained.

When the box culverts 2 are installed on the ground, by using the connecting structure 1,
Eliminates the need to form rigid foundations to prevent displacement, implement ground improvement, and install flexible joints for retrofitting to deal with displacement, and to construct joint grooves and sewers by each box culvert 2 when constructing it. It is possible to realize labor saving, rationalization and reduction of construction cost.

FIG. 6 shows an embodiment according to claim 4 of the present invention. Here, the PC with the special fixing device 10
Box removing part 16 (Fig. 1 (a))
(See (b)) and as a processing after the fixing work, an elastic seal material 17 (normal temperature curing type soft material) is filled.

More specifically, it has been customary to fill the inside of the box removing section 16 for the fixing work up to now with a strong material such as non-shrink mortar as a process after the fixing work. However, with this strong material, the special fixing tool 10 cannot move in the box removing part 16 following the change in the arrangement position of the PC steel rod 6. Moreover, the special fixing device 10 itself may be adversely affected.

Therefore, in the present invention, by filling the inside of the box removing portion 16 with the elastic sealing material 17 (normal temperature curing type soft material),
A predetermined amount of displacement in the fixing portion (special fixing tool 10) of the PC steel rod 6 is secured. In addition, this elastic seal material 17
Can also be expected to protect and prevent corrosion of the fixing body (special fixing device 10).

Even if the fixing portion of the PC steel rod 6 moves due to displacement due to an earthquake or the like, the movement due to the displacement is performed within the range filled with the elastic seal material 17 (normal temperature hardening type soft material). Therefore, no damage appears on the fixing body (special fixing tool 10). Further, the opening surface portion of the box removing portion 16 is mortar finished as shown in FIG.

[0029]

EFFECTS OF THE INVENTION In the flexible connection structure of the box culvert according to the present invention, the connection structure having both the water stop plate and the PC steel bar is adopted, so that the connection portion of each box culvert is against displacement due to ground subsidence or the like. It is possible to reliably follow each other, and it is possible to maintain the connected state while ensuring the water-stop state of each box culvert. From this, even if displacement occurs due to ground subsidence or the like in the connected state of each box culvert, the function of each box culvert as a common groove, sewer or the like can be maintained.

Therefore, if the flexible connecting structure of the present invention is adopted, it is unnecessary to form a rigid foundation, improve the ground, and attach a flexible joint for retrofitting when installing each box culvert on the ground. Even if it is possible to deal with the displacement, it is possible to realize labor saving, rationalization and reduction of construction cost when constructing a common groove or sewer by each box culvert.

Further, by fixing an elastic sealing material (softening material at room temperature) into the box-extracting portion for fixing the both ends of the PC steel rod by the special fixing tool, the fixing portion of the PC steel rod (special fixing tool) 2) can be performed after the fixing operation to the box removing section without damaging the fixing section (special fixing tool) itself.

[Brief description of drawings]

FIG. 1 (a) is a sectional view taken along the line AA of FIG. 1 (b) showing each box culvert connected by using the flexible connection structure of the present invention, and FIG. 1 (b) is a line BB of (a). In cross section, (c) and (d) are
It is the schematic which shows the displacement following state in the AA line sectional view of (b), and (e) and (f) is a schematic diagram which shows the displacement following state in the CC line sectional view of (b). .

FIG. 2 is an enlarged detailed view of a D portion in FIG. 1 (c).

FIG. 3 is an enlarged detailed view of an E portion in (d) of FIG.

FIG. 4 is an enlarged detailed view of an F portion in (e) of FIG.

5 is an enlarged detail view of a G portion in FIG. 1 (f).

6 is an enlarged cross-sectional view taken along line HH in FIG. 1 (b).

[Explanation of symbols]

1 ... Connection structure, 2 ... Box culvert, 2a ... Space part,
3 ... Connection part, 4 ... Installation ground, 5 ... Water stop plate, 5a ... Base part, 6
… PC steel rod, 7… Water stop part, 7a… Arch part, 7b… Straight part,
8 ... Span seal, 9 ... Sheath tube, 10 ... Special fixing tool, 11
… Fixing nuts, 12… hemispherical washers, 12a… bearing surfaces, 12b…
Spherical part, 13 ... Base for washer, 13a ... Concave part, 13b ... Through hole, 14 ... Biasing device, 14a ... Coil spring, 15 ... Sliding member, 16
… Box removal part, 17… Elastic sealing material.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Yuichi Hirose 4 13-13 Araki-cho, Shinjuku-ku, Tokyo Within Sumitomo Concrete Industry Co., Ltd. (72) Inventor Yugen Kimishima 4 4-13 Araki-cho, Shinjuku-ku, Tokyo (72) Inventor Shinichi Yaginuma, 13-13 Araki-cho, Shinjuku-ku, Tokyo In-house Concrete Building, Ltd. (72) Shinji Fujieda, 13-13, Araki-cho, Shinjuku-ku, Tokyo Residential building company crete industry Co., Ltd. (72) Inventor Yukihisa Shinbo 4-13 Araki-cho, Shinjuku-ku, Tokyo 4 Building structure company crete industry Co., Ltd. (72) Inventor Yukihiro Ouchi 13-araki-machi, Shinjuku-ku, Tokyo No. 4 of Sumitomo Concrete Industry Co., Ltd. (72) Inventor Yoichi Yagaki No. 4 of Sumitomo Concrete Industry Co., Ltd., 13 Arakicho, Shinjuku-ku, Tokyo Inside the company (72) Inventor Jiro Kondo 4 13 Ken Araki-cho, Shinjuku-ku, Tokyo Inside Sumitomo Concrete Concrete Co., Ltd. (72) Inventor Fumio Kadota 5351 Minamioka, Minoujima-cho, Fukuyama-shi, Hiroshima Prefecture Hayakawa Gom Co., Ltd. ( 72) Inventor Kazuharu Asakura 5351 Minamioka, Minoshima-cho, Fukuyama-shi, Hiroshima Prefecture Hayakawa Gomu Co., Ltd.

Claims (4)

[Claims] 1. A flexible connection used for connecting portions of the box culverts when constructing a common groove, a sewer or the like by connecting and installing a large number of box culverts with a closed cross section having a space in the center. The structure has a structure in which a water stop plate is provided at a connecting portion between the box culverts around the space of the box culverts, and the box culverts are connected by a PC steel rod. The plate is configured to be able to follow the displacement of the installation position of each of the box culverts caused by the weakening of the installation ground, an earthquake, etc. while maintaining the water blocking effect of the connecting portion. When the rod exceeds the design displacement amount of the water blocking plate, the rod can suppress the displacement to prevent the water blocking plate from being damaged, and the sticking state of the rod can be the water blocking state. A flexible connection structure in a box culvert, which is configured so that it can be maintained by a fixing unit capable of following a design displacement of a plate. 2. A water stop plate provided at a connecting portion between the box culverts is integrally molded by connecting both base portions embedded in connecting end portions of both box culverts to be connected. It is configured to block the connection between the box culverts to stop water, and when displacement occurs at the connection, it is possible to follow the displacement while maintaining the water blocking effect by cutting off part. The flexible connection structure for a box culvert according to claim 1, wherein the flexible connection structure comprises a water stop portion. 3. A P connecting each box culvert.
The C steel rod is bridged between the box culverts, and both ends thereof are fixed to the connection side ends of the box culverts, and the displacement of the fixing position of each box culvert to each box culvert, that is, each It is arranged so that it can follow the displacement of the installation position of the box culvert.
2. The flexible connecting structure for a box culvert according to claim 1, wherein a special fixing tool configured to absorb the follow-up to the displacement and maintain a fixed state. 4. An elastic sealant (softening material at room temperature) is filled in a box removing part for fixing work of both ends of a PC steel rod by a special fixing tool as a treatment after the fixing work. The flexible connection structure in the box culvert according to claim 3.