JPS6137515B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an underdrain joint used to connect underdrains such as water and sewerage systems, common ditches, underground passages, tunnels, and sunken boxes.

In culvert joints, an anchoring member having a casing is attached to each of a pair of culverts to be connected, and both ends of the load-bearing member disposed between the two anchoring members are inserted into the casing of each anchoring member. The ends of the cylindrical flexible water-stopping member arranged on the inner and outer peripheries of the load-bearing member are inserted in such a way that they cannot be removed and are movable within a certain range, and are attached to the opposing anchoring members. It is known to connect underdrains in a relatively displaceable and watertight manner.

In this type of culvert joint, if there is a large gap between the load-bearing members, the flexible water-stopping member will expand and deform into the gap due to external water pressure, and this bulge will cause the anchoring members to There is a risk of damage due to being pinched between the load-bearing members during displacement. Therefore, conventionally, in order to prevent this, the gap between the load-bearing members is reduced, or the side edges of the load-bearing members are overlapped with each other, so that the gap between the load-bearing members is completely eliminated. was. However, with such a configuration, the load-bearing member supported by the anchoring member is formed to have an excessive strength that is higher than the minimum necessary strength, which increases the weight and deteriorates the handling property. This method had the disadvantage of high costs due to the use of excess material.

The object of the present invention is to provide a joint for an underdrain that eliminates these drawbacks.

The first invention prevents the flexible water-stopping member from sagging between the load-bearing members due to external water pressure by loosely fitting a cylinder slightly shorter than the initial distance between the pair of anchoring members around the outer periphery of each load-bearing member. Therefore, the load-bearing member supported by the anchor member is formed to have the minimum necessary strength,
The present invention is characterized by improving the handling of the load-bearing member, and also by saving materials and reducing costs.

The second invention loosely fits a cylindrical body slightly shorter than the initial interval between a pair of anchoring members onto the outer periphery of each load-bearing member, and the gap between each cylindrical body can be defined as the outer periphery of an annular row of a plurality of cylindrical bodies. By covering the sheet-like or cylindrical body made of flexible material that is placed between the flexible water-stopping member and in contact with each cylindrical body, the flexible water-stopping member is prevented from sagging between the load-bearing members due to external water pressure. This feature is characterized in that this can be carried out more reliably than in a structure in which a cylindrical body is loosely fitted into a load-bearing member.

An embodiment of the present invention will be described below with reference to the drawings.

In Figure 1, 1, 1 is a culvert with a circular cross section, consisting of steel segments, concrete segments,
Segments 1a and 1'a consisting of RC segments, etc.
was assembled, and concrete 1b, 1'b was poured around the inner periphery as a secondary winding. 2 is an underdrain joint of the present invention that connects the underdrains 1 and 1'.

As shown in FIG. 2, the underdrain joint 2 has anchoring members 3, 3' fixed to mutually opposing surfaces of a pair of underdrains 1, 1', respectively. The anchoring members 3, 3' are formed in an annular shape along the end faces of the underdrains 1, 1'. Further, the anchoring members 3, 3' have housing portions 3a, 3'a. In the figure, 3b and 3'b are side walls facing each other of the housing parts 3a and 3'a, and 3c and 3'c are side walls 3b and 3'a facing each other of the housing parts 3a and 3'a.
'b is the opposite side wall, 3d, 3'd are side walls 3b, 3
A width stopper that regulates the distance between c or between 3'b and 3'c, with both ends fixed to 3b and 3c or 3'b and 3'c, respectively, and arranged at appropriate intervals in the circumferential direction. has been done. 4, 4' are between the side walls 3b, 3c or 3'b,
The space formed between 3'c, 5, 5' is the side wall 3b,
Holes 6 and 6' for inserting the force-bearing member drilled in the side walls 3'b and for allowing movement of the force-bearing member within a certain range after insertion of the force-bearing member are holes 6 and 6' drilled in the side walls 3c and 3'c for inserting the force-bearing member. It is a hole. These holes 5, 5' are opposite to each other, and the holes 5, 6 and 5', 6' are also opposite to each other. In the figure, 7 and 7' are blind plugs for the holes 6 and 6'.

8 is a load-bearing member disposed between the anchoring members 3 and 3'. Although only one load-bearing member 8 is shown in the figure, in reality, a plurality of the same load-bearing members 8 are arranged in a ring at equal pitches in the circumferential direction along the anchoring members 3, 3'.

This load-bearing member 8 includes a bolt 9 whose both ends are inserted into the spaces 4 and 4' of the housing parts 3a and 3'a through the holes 5 and 5', respectively, and threaded parts 9 at both ends of the bolt 9.
Nut 10 screwed onto a and 9'a as shown in Fig. 3,
10'. This nut 10,1
0' is screwed into the threaded portions 9a, 9'a of the bolt 9 through the respective spacing portions of the width stoppers 3d, 3'd. Further, the nuts 10, 10' are formed larger than the holes 5, 5' to prevent the bolt 9 from coming out of the holes 5, 5'. In this way, both ends of the force-bearing member 8 are inserted into the spaces 4, 4' in a manner that cannot be removed. The above-mentioned threaded parts 9a, 9'a
is formed slightly shorter than the width H of the nuts 10, 10', as shown in FIG.
Filler material 11, 11' is filled in the part where the threaded parts 9a, 9'a of 0' are not screwed together, and the threaded part 9
It is designed to prevent corrosion of a and 9'a. With this configuration, the force-bearing member 8 connects the anchoring members 3 and 3' so that they can approach and separate from each other within a certain range.

The bolt 9 of each load-bearing member 8 has an inner diameter of
A cylindrical body 12 having a diameter larger than that of the cylindrical body 12 is loosely fitted. It is formed slightly shorter than this cylindrical body. Each cylinder 1
2 forms an annular row with each load-bearing member 8.

Rubber,
First and second flexible water-stopping members 13 and 14 having different diameters and formed into short cylindrical shapes made of synthetic resin or the like are disposed coaxially with the annular row of cylindrical bodies 12. A similar third flexible water stop member 15 is also coaxially disposed at the inner peripheral position of the annular row of the cylindrical body 12. Both ends of these cylindrical flexible water stop members 13, 14, 15 are attached to the side walls 3b, 3'b of the housing parts 3a, 3'a, respectively, and between the anchoring members 3, 3'. are connected watertight. In the figure, reference numeral 16 denotes a skin plate disposed across the outer peripheral surfaces of the anchoring members 3, 3', and both ends of the skin plate are welded and fixed to the anchoring members 3, 3'.

FIG. 3 shows another embodiment of the present invention. This embodiment differs from the first embodiment shown in FIG. 2 in that it includes a sheet-like material 17, and the other configurations are different from the first embodiment shown in FIG. Since this is the same as the first embodiment, the explanation will be omitted.

A sheet-like material 17 made of a non-stretchable and flexible material is disposed between the annular row of the plurality of cylindrical bodies 12 and the flexible water-stopping member 14 described above. Materials for this sheet-like material 17 include woven fabrics or non-woven fabrics made of synthetic fibers such as vinylon and nylon;
Alternatively, a reinforcing cloth made of this cloth or a cloth made of natural fibers coated with rubber may be used. This sheet-like material 17
are wound around each cylindrical body 12, and both ends thereof are overlapped with each other at the lower end of the annular row of cylindrical bodies 12. In this way, each cylinder 12, 12
The gap 18 between them is covered with a sheet-like material 17 that is in contact with the cylindrical body 12, as shown in FIG.

Next, the operation of the underdrain joint 2 having such a configuration will be explained.

A culvert 1 connected using such a culvert joint 2,
1' is usually used by being buried in the ground.

Due to uneven subsidence of this ground, culvert 1,
If a large relative displacement force acts in the direction away from the culvert 1' and the skin plate 16 breaks midway or its ends separate from the anchoring members 3, 3', the anchoring member 3 will be separated from the culvert 1. It is integrally separated from the underdrain 1' and the anchoring member 3'. This separation is limited within a certain range by the force-bearing member 8.

On the other hand, as a result of this action, the first flexible water-stopping member 13 is damaged by external water pressure and earth and sand, and the external water pressure acts on the second flexible water-stopping member 14, causing the first flexible water-stopping member 13 to be damaged. Even if the flexible water-stopping member 14 of No. 2 bulges and deforms in the tube axis direction (load-bearing member 8 side), the gap between the cylinders 12 and 12 is small, so the bulge deformation part is between the cylinders 12 and 12. There is little chance of it entering. Furthermore, in the second embodiment, the bulging deformation portion abuts against the sheet-like object 17, so in this case, the bulging deformation portion contacts the cylindrical body 1.
It does not enter between 2 and 12.

In the second embodiment described above, both ends of the sheet-like material 17 are simply overlapped, but the overlapping portions of both ends may be adhesively fixed to form a cylindrical body. Alternatively, one of the nuts 10, 10' may be provided integrally with the bolt 9 from the beginning.

In addition, in the above-mentioned embodiment, an example was shown in which the underdrain joint 2 was applied to the underdrains 1 and 1' consisting of the segments 1a and 1'a1 and the secondary wraps of concrete 1b and 1'b. The joint 2 is not limited to this, but can also be applied to underdrains made of other materials. For example, the underdrain joint 2 may be applied to an underdrain made solely of steel or concrete. Moreover, culvert 1,1′
The cross-sectional shape of the underdrains 1 and 1' may be circular, elliptical, square, or polygonal, and the underdrains 1 and 1' may be integral parts or may be constructed by assembling divided members. You may. These points also apply to the underdrain joint 2.

Further, the flexible water stop members 13, 14, 15 may have bellows-shaped, straight, or other various cross-sectional shapes. Moreover, the assembly and burying of such underdrains 1, 1' and culvert joints 2,
Any of the following methods may be used: open cut method, shield method, and push method.

Moreover, it goes without saying that the cylindrical body 12 may have a cross section other than a circular shape, such as a rectangular shape, another polygonal shape, or an elliptical shape.

The first invention, as explained above, loosely fits the cylindrical body slightly shorter than the initial distance between the pair of anchoring members on the outer periphery of each load-bearing member, so that the load-bearing members supported by the anchoring members can be reduced to the necessary minimum size. The handleability and workability of the load-bearing member can be improved by forming it to a maximum strength.

Furthermore, this allows the material used for the load-bearing member to be saved and costs to be reduced.

In addition, even when the flexible water-stopping member is deformed by external pressure, the presence of the cylindrical body prevents it from getting caught between adjacent load-bearing members and being damaged, or being caught between the load-bearing members and causing damage, which is the case in the past. Can be used safely for a period of time.

In addition, the second invention loosely fits a cylinder slightly shorter than the initial interval between the pair of anchoring members on the outer periphery of each load-bearing member, and the outer periphery of a plurality of cylinders between the cylinders and the flexible Since the flexible water stopper is covered with a sheet-like material or a cylindrical body placed between it and the water-stopping member, when the flexible water-stopping member is deformed by external pressure, it will enter between the cylindrical bodies due to the presence of the sheet-like material (or cylindrical body). Therefore, the first invention more reliably prevents damage from getting caught between adjacent load-bearing members, or from being caught between load-bearing members than in the past. , can be used safely for a long time.

As a result, even if the minimum number of load-bearing members supported by the anchoring member is provided and the spacing between the load-bearing members is made slightly larger, the flexible water-stopping member will not intrude between the cylindrical bodies that are loosely fitted to the load-bearing members. can be reliably prevented.

Furthermore, this allows the material used for the load-bearing member to be saved and costs to be reduced.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view of a culvert connected by a culvert joint of the present invention. Figure 2 shows
FIG. 2 is a sectional view showing a first embodiment of the underdrain joint shown in FIG. 1; FIG. 3 is a diagram corresponding to FIG. 2 showing another embodiment of the present invention. FIG. 4 is an enlarged partial cross-sectional view of the load-bearing member shown in FIG. 2. FIG. 5 is a sectional view taken along the line -- in FIG. 3. 1, 1'... Underdrain, 2... Underdrain joint, 3, 3'... Anchoring member, 8... Load-bearing member, 9... Bolt, 10, 1
0'...Nut, 12...Cylinder, 13, 14, 15...
Flexible water stop member, 17... Sheet-like material, 18... Gap.

Claims (1)

[Claims] 1. Moving within a certain range the ends of a plurality of load-bearing members arranged at intervals in the circumferential direction of a pair of annular anchoring members attached to the end faces of a pair of underdrains to be connected. A short cylindrical tube that can be inserted into and connected to the lower part and is disposed between the two anchoring members on the outside of the annular row of the plurality of load-bearing members and whose ends are fixed to both the anchoring members. A joint for an underdrain watertightly connected by a flexible water-stopping member, characterized in that a cylindrical body slightly shorter than the initial distance between the two anchoring members is loosely fitted around the outer periphery of each of the load-bearing members. 2. The underdrain joint according to claim 1, characterized in that the flexible water-stopping member disposed outside the annular row of the plurality of load-bearing members is formed of two layers. 3 In claim 1 or 2,
A joint for an underdrain, characterized in that a skin plate is disposed across the outer peripheral surface of the anchoring member. 4. In any one of claims 1 to 3, it is provided that a flexible water stop member is disposed inside the annular row of the plurality of load-bearing members, spanning both the anchoring members. Characteristic culvert joints. 5 The ends of a plurality of load-bearing members arranged at intervals in the circumferential direction of a pair of annular anchoring members attached to the end faces of a pair of culverts to be connected can be moved within a certain range and cannot be removed. In addition to inserting and concatenating,
A culvert water-tightly connecting a short cylindrical flexible water stop member which is disposed between the two anchoring members on the outside of the annular row of the plurality of load-bearing members and whose ends are fixed to both the anchoring members. In the joint, a cylindrical body slightly shorter than the initial distance between the two anchoring members is loosely fitted around the outer periphery of each of the load-bearing members, and the gap between the cylindrical bodies is set between the outer periphery of the annular row and the flexible water stop member. A joint for an underdrain characterized by an octopus covered with a sheet-like or cylindrical body made of a flexible material, which is disposed in the cylindrical body and in contact with each cylindrical body. 6. The joint for an underdrain according to claim 5, wherein the flexible water-stopping member disposed outside the annular row of the plurality of load-bearing members is formed of two layers. 7 In claim 5 or 6,
A joint for an underdrain, characterized in that a skin plate is disposed spanning the outer peripheral surface of the anchoring member. 8. In any one of claims 5 to 7, it is provided that a flexible water-stopping member is disposed inside the annular row of the plurality of load-bearing members and spanning both the anchoring members. Characteristic culvert joints.