JPS62295B2 - - 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.

Generally, in order to prevent damage to the culverts due to uneven subsidence of the ground, the opposing ends of a plurality of culverts are connected by joints having an expandable structure. Furthermore, it is desirable that the underdrain be buried underground and be able to absorb large relative displacements in the direction of the pipe axis. On the other hand, in a culvert joint, an anchoring member having a casing is attached to each of a pair of culverts to be connected.
Both ends of the load-bearing member disposed between the two anchoring members are inserted into the casing of each anchoring member so that they cannot be removed and are movable within a certain range, and are arranged on the inner and outer peripheries of the load-bearing member. It is known to attach the ends of a cylindrical flexible water stop member to a pair of opposing anchoring members to connect both culverts 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 bulges and deforms into the gap due to external water pressure, and this bulge prevents relative displacement between the anchoring members. At times, there is a risk of damage due to being pinched between load-bearing members. Therefore, conventionally,
In order to prevent this, configurations have been adopted in which the gaps between the load-bearing members are reduced or the gaps between the load-bearing members are eliminated altogether. However, with such a configuration, the load-bearing member will be formed with an excessive strength that is higher than the minimum strength necessary to support the anchoring member.
As the weight increases and the handling becomes worse,
This method had the disadvantage of high costs due to the use of excess material.

The present invention has been made in view of this point, and is capable of attaching socket pipes to both ends of a flexible water-stopping member, and making the socket pipes movable relative to the outer periphery of the end of the culvert in the axial direction of the pipes. By loosely fitting, it is possible to absorb large relative displacements in the axial direction between the underdrains, and by interposing a sealing member between the inner circumferential surface of the socket pipe and the outer circumferential surface of the end of the underdrain. In addition to water-stopping the relative displacement part, by loosely fitting a cylindrical body slightly shorter than the initial distance between the pair of anchoring members to the outer periphery of each load-bearing member, the flexible water-stopping member is prevented by external water pressure. This prevents sagging between load-bearing members,
The load-bearing member is formed to have the minimum strength necessary to support the anchoring member, thereby improving the handling of the load-bearing member and saving materials and reducing costs. be.

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

In FIG. 1, 1 and 1' are concrete underdrains with a circular cross section, and 2 is an underdrain joint of the present invention that connects the underdrains 1 and 1'. Below, this underdrain joint 2 will be explained in detail.

FIG. 2 is a sectional view showing the relationship between the underdrains 1 and 1' of FIG. 1 and the underdrain joint 2. In FIG. 2, the culvert joint 2 has annular anchoring members 3, 3' arranged at opposite ends of the culverts 1, 1'. The anchoring member 3 has a cylindrical body 3a, and is arranged within the cylindrical body 3a at intervals in the tube axis direction, and has an outer peripheral edge welded and fixed to a middle part of the inner peripheral surface of the cylindrical body 3a. The annular plates 3b and 3c are arranged at equal pitches in the circumferential direction between the annular plates 3b and 3c, and both ends of the annular plates 3b and 3c are located between the annular plates 3b and 3c.
radially directed ribs 3 welded to b, 3c;
e, 3f and the inner peripheral edge sides of the annular plates 3b, 3c, are arranged at equal pitches at intervals in the circumferential direction, and have their outer peripheral centers connected to the inner peripheral edge of the rib 3f, and have an annular shape. A rib 3g facing in the circumferential direction and having both ends welded and fixed to the plates 3b and 3c, respectively, and a rib 3g
A cylindrical body 3h disposed on the inner circumferential side of the cylindrical body 3h, and a bolt 3i and a nut 3 that fix the cylindrical body 3h to the rib 3g.
has j. Such an anchoring member 3 has a cylindrical body 3a.
One end portion (one end cylindrical portion) is fitted to the outer periphery of the end portion of the underdrain 1. A circumferentially extending annular groove 4 is formed on the outer periphery of the end of the culvert 1, and a groove made of rubber, synthetic resin, etc. is formed between the annular groove 4 and the inner circumferential surface of one end of the cylindrical body 3a. A seal ring 5 is interposed. Since the anchoring member 3' is formed in the same manner as the anchoring member 3 and is similarly attached to the culvert 1',
Parts that are the same as those on the anchoring member 3 side are denoted by reference numerals with a dot attached, and their explanation will be omitted.

In the figure, 6 and 6' are insertion holes drilled in the annular plates 3b and 3'b at equal pitches in the circumferential direction, and 7 and 7' are insertion holes in the annular plates 3b and 3'b.
This is a cavity formed between b and 3c.

Further, the underdrain joint 2 has load-bearing members 8 located between the anchoring members 3 and 3' and arranged at equal pitches in the circumferential direction. This load-bearing member 8 consists of nuts 10, 10' whose opposite ends are inserted into cavities 7, 7' through insertion holes 6, 6'. In addition, Natsuto 10,
The flange portions 10a, 10'a of 10' are formed to have a larger diameter than the insertion holes 6, 6'. As a result, both ends of the force-bearing member 8 are held by the anchoring members 3, 3' so that they can move within a certain range and cannot come off. The load-bearing member 8 also has a cylindrical body 11 that is shorter than the interval between the anchoring members 3 and 3' and has a larger diameter than the bolt 9.
is loosely fitted (see Figure 3). This cylinder 11
By reducing the gap formed between the load-bearing members 8, 8'..., the flexible water-stopping member 12 is reduced by earth pressure, external water pressure, etc.
This makes it possible to prevent pinching when the member bulges and deforms toward the load-bearing member 8 side. The flexible water stop members 12 and 13 are formed from rubber, synthetic resin, etc. into a short cylindrical shape.
The flexible water-stopping member 12 is loosely fitted around the outer periphery of the annular row of force-bearing members 8, and is fixed at both ends to the anchoring members 3, 3', respectively. Further, the flexible water stop member 12 has a wave-shaped cross section. The flexible water-stopping member 13 is located on the outer periphery of the flexible water-stopping member 12, and its both ends are fixed to the inner peripheries of the ends of the cylindrical bodies 3a, 3'a. Although not shown, a sheet-like material made of a non-stretchable and flexible material is disposed in a cylindrical shape between the annular row of the plurality of cylinders 11 and the flexible water stopper member 12. By covering the outer periphery of the annular row of cylinders 11, 11..., the flexible water stop member 12 closes the cylinder 1 when external pressure is applied.
1, 11, etc. may be more effectively prevented from being caught between them.

In this case, the material for the sheet-like material is generally a woven fabric or non-woven fabric made of synthetic fibers such as vinylon or nylon, or a reinforced fabric made by rubberizing this fabric or a fabric made of natural fibers. .

In addition, this sheet-like material is wound around each cylindrical body 11, 11..., and both ends are wrapped around each cylindrical body 11, 11...
It is preferable for work to overlap each other at the lower ends of the annular rows.

Both ends of a tubular skin plate 14 are fitted to the outer periphery of the cylindrical bodies 3a, 3'a, and one end of the skin plate 14 is welded and fixed to the outer periphery of the cylindrical body 3a in the circumferential direction. The other end of the plate 14 is spot welded to the cylindrical body 3'a at several locations.
Further, a flexible water stop member 15 formed in a short cylindrical shape and made of rubber or synthetic resin is interposed so as to straddle the inner peripheral ends of the anchoring members 3, 3'.

Next, the operation of connecting the underdrains 1 and 1' using the underdrain joint 2 as described above and the function of the underdrain joint 2 will be explained.

The construction method for burying culverts 1 and 1′ underground is as follows:
Any of the open-cut method, the shield method, and the propulsion method may be used, but in this embodiment, the case where the underdrains 1 and 1' are buried underground by the propulsion method will be explained.

In this case, the cylindrical bodies 3h, 3'h, the load-bearing member 8,
Prior to attaching the flexible waterproof member 12 to the anchoring members 3, 3', the strut 16 is arranged between the anchoring members 3, 3' as shown in FIG. 17', and are attached to the anchoring members 3, 3' with nuts 18, 18'. Note that the insertion holes 6, 6' are used for this attachment. Like this, strut 1
The underdrains 1 and 1' connected at 6 are pressed horizontally into the ground from the bottom of a shaft provided in the ground using a hydraulic jack. This work will be carried out in sequence, and the earth and sand in the underdrains 1 and 1' will be removed one by one.

After a continuous underdrain of a certain length is formed in this way, a strut 16 is inserted from between the anchoring members 3 and 3'.
After removing the anchoring members 3 and 3' and interposing the flexible water stop member 12 between the anchoring members 3 and 3', insert both ends of the bolt 9 inserted into the cylindrical body 11 through the insertion holes 6 and 6' into the hollow part 7,
7', and then insert the nuts 10, 10 between the rib 3g and the same rib (not shown) or between the rib 3'g and the same rib (not shown).
are inserted into the cavity, and the nuts 10, 10' are screwed onto both ends of the bolt 9.

After this, the cylindrical body 3h, inside the ribs 3g, 3'g,
3'h, and a flexible water stop member 15 is interposed between the anchoring members 3 and 3' to complete the underdrain joint 2.

On the other hand, when the ground subsides unevenly and a force acts on the culverts 1 and 1' to displace them in the direction of separation, and the skin plate 14 separates from the cylindrical body 3'a, the culverts 1 and 1' move relative to each other. They are separated and the flexible water stop members 12 and 13 are extended. At this time, even if the flexible water stop member 13 is cut and water leaks inside it,
The flexible water-stopping member 12 prevents water from leaking to the load-bearing member 8 side. Further, even if the flexible water stop member 12 bulges and deforms due to external water pressure, it will not penetrate to the position where it is supported by the cylinder 11 and sandwiched between the cylinders 11, 11. Furthermore, when the uneven subsidence of the ground progresses, the load-bearing member 8 prevents the relative displacement. In addition, this culvert 1, due to uneven subsidence of the ground.
1', the anchoring members 3, 3' and the underdrains 1, 1' can be slightly displaced relative to each other. In the figure, 19,1
9' is a bolt for attaching the flexible water stop member.

In the embodiment described above, an example was shown in which the underdrain joint 2 is applied to the concrete underdrains 1 and 1', but this underdrain joint 2 is not limited to the concrete underdrains 1 and 1', and can be applied to other materials. It can also be applied to culverts consisting of For example, the underdrain joint 2 may be applied to an underdrain made of steel or cast iron, or an underdrain made of steel or cast iron and concrete.

Furthermore, although an example is shown in which the underdrains 1 and 1' have circular cross-sections, the cross-sectional shape of the underdrains 1 and 1' is not limited to circular, but may be rectangular, elliptical, or polygonal. However, the underdrains 1, 1' may be constructed as a single piece or by assembling divided members. These points also apply to the underdrain joint 2. Further, although a right cylindrical member is shown as the flexible water stop member 15, it is not limited to this, but may be a bellows-shaped member, or one or more hollow parts may be provided in the circumferential direction to facilitate expansion and contraction. Of course, it may also be a structure.

As explained above, in the present invention, the socket pipes at both ends of the joint of the underdrain are loosely fitted to the outer periphery of the end of the underdrain so that they can be relatively displaced in the pipe axial direction. In addition, since a sealing member is interposed between the inner peripheral surface of the socket pipe and the outer peripheral surface of the end of the underdrain, water can be reliably stopped between the socket pipe and the end of the underdrain. can. In addition, since a cylindrical body slightly shorter than the initial distance between the pair of anchoring members was loosely fitted around the outer periphery of each load-bearing member, the load-bearing member was formed to have the minimum strength necessary to support the anchoring member, and the load-bearing member was Handling and processability can be improved.

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

Further, when the flexible water-stopping member is deformed by external pressure, the cylindrical body attached to the load-bearing member does not enter between adjacent load-bearing members and be damaged, so that it can be used safely for a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a culvert connected by a culvert joint of the present invention. FIG. 2 is a sectional view taken along line - in FIG. 1. FIG. 3 is a sectional view taken along line - in FIG. 2. FIG. 4 is a sectional view showing a state in which a strut for the propulsion method is attached to the joint of the underdrain shown in FIG. 2 with some of its parts removed. 1, 1'... Underdrain, 3, 3'... Anchoring member, 5... Seal member, 8... Load-bearing member, 11... Cylindrical body, 12, 13
...Flexible water stop member.

Claims (1)

[Claims] 1. One end tube of a pair of annular anchoring members is fitted to the outer periphery of opposing ends of a pair of underdrains to be connected, and a plurality of load-bearing members are arranged circumferentially between the two anchoring members, Further, both ends of each load-bearing member are held by both anchoring members so that they can move within a certain range and cannot be detached, and a short cylindrical flexible water-stopping member made of rubber, synthetic resin, etc. is attached to the load-bearing member. loosely fit around the annular row outer periphery of
Further, both ends of the flexible water stop member are fixed to each of the anchoring members in a watertight manner, and a cylindrical body that is slightly shorter than the initial distance between the two anchoring members is loosely fitted around the outer periphery of the load-bearing member. culvert joint.