JPS6137439B2 - - Google Patents

Description

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

Generally, in order to prevent culverts buried underground from being damaged due to uneven ground subsidence, adjacent culverts in areas where uneven ground subsidence is expected are connected using expandable culvert joints. is normal.

This type of culvert joint includes anchoring members respectively attached to opposite ends of a pair of culverts to be connected;
There is a type that is formed from rubber, synthetic resin, etc. into a short cylindrical shape and is equipped with a flexible water stop member that is placed astride between the two anchoring members.

When burying underground conduits connected by such type of underdrain joints using the shield method or propulsion method, a thrust force is applied to the underdrain in the direction of the pipe axis, so it is necessary to install a strut between the two anchoring members. This is used to prevent damage to the underdrain joints. However, conventionally, after a culvert is buried underground, the struts are removed from between the anchoring members, and a load-bearing member or the like is interposed between the anchoring members. For this reason, in the past, it took a lot of effort to complete the joint of the underdrain.

The object of the present invention is to provide a joint for an underdrain that solves this problem, in which strut members are attached to the opposing surfaces of both anchoring members, and the opposing surfaces of both strut members are brought into contact with each other. This structure allows the strut members to receive thrust in the direction of the pipe axis during the propulsion method, and after burial, the strut members are left as they are as load-bearing members.

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 circular cross sections, and 2 is a joint of the underdrains that connects the underdrains 1 and 1'.

In Figure 2, 1a and 1'a are culverts 1 and 1'a.
1' is an annular groove formed on the outer periphery of the opposite end.

The joint 2 of the culvert connects the culverts 1 and 1' as shown in Figure 2.
A collar 3 whose one end is loosely fitted to the outer periphery of the opposite end of the collar 3,
3', anchoring members 5, 5' welded and fixed to the inner circumferential surface of the other end of the collars 3, 3', and a short cylindrical flexible water stopper installed across the anchoring members 5, 5'. It consists of a member 6 and strut members 7, 7' fixed to the anchoring members 5, 5', respectively, inside the flexible water stop member 6. Seal rings 4, 4' are interposed between the collars 3, 3' and annular grooves 1a, 1'a provided on the outer peripheries of the underdrains 1, 1'. Anchoring member 5,
5' is made up of cylindrical parts 5a, 5'a and annular plates 5b, 5'b provided at the outer ends of the cylindrical parts 5a, 5'a, and has a substantially L-shaped cross section. . The cylindrical portions 5a, 5'a of the anchoring members 5, 5' are connected to the collar 3,
It is welded to the inner peripheral surface of 3'.

The flexible water stop member 6 is made of rubber, synthetic resin, etc.
Both ends thereof are watertightly attached to the inner peripheral surfaces of the cylindrical portions 5a and 5'a with bolts and nuts. The strut members 7, 7' have side surfaces 7a, 7b, 7'a, 7'
b, and is formed into a cross-sectional shape by connecting portions 7c and 7'c. The side surfaces 7a, 7'a are attached to the annular plates 5b, 5'b of the anchoring members 5, 5' with the nuts 9, 9' of the bolts 8, 8'.
and its opposite side surface 7b,
7'b are brought into contact with each other. The strut members 7, 7' are arranged as a pair with opposing strut members 7, 7' being spaced apart from each other in the circumferential direction. The connecting portions 7c and 7'c are arranged flush. Reference numeral 10 denotes a skin plate that is loosely fitted to the outer peripheral surfaces of the collars 3 and 3'. This skin plate 1
0, one end edge is welded all around to the circumferential surface of the collar 3,
The other end edge is spot welded to the circumferential surface of the collar 3'. 13, 13' are members having slipping properties, for example,
It is made of Teflon, polyethylene, polycarbonate, silicone, nylon, etc., and is fixed to at least one opposing side surface of the side surfaces 7b, 7'b of the strut members 7, 7' to prevent relative movement due to uneven settlement between the underdrains 1, 1'. This is done so that it can be done smoothly.

Next, a description will be given of the operation of connecting an underdrain using the underdrain joint having such a configuration and its function.

The connection work for the underdrains 1 and 1' is performed when the underdrains 1 and 1' are buried in the ground. Moreover, this culvert 1,
1' may be buried by any of the open cut method, shield method, and thrust method.

In this embodiment, a case will be explained in which the underdrains 1 and 1' are buried in the ground using the propulsion method. In this propulsion method, the abutted side surfaces 7b, 7'b of the strut members 7, 7' are connected by bolts 11 and nuts 12. In this state, the underdrains 1 and 1' are press-fitted into the ground at the bottom of the shaft using a hydraulic jack, and then the earth and sand inside is removed. By performing these operations one after another, a culvert of a certain length is formed. After a continuous underdrain of a certain length is formed in this way, bolts 11 and nuts 1 are inserted from the strut members 7 and 7'.
By removing 2, the underdrain joint 2 is completed.
On the other hand, as mentioned above, the ground in which the underdrains 1 and 1' are buried settles unevenly, and a displacement force acts on the underdrains 1 and 1' in the direction of separating them from each other, causing the welded portion of the skin plate 10 to the collar 3' to When they separate, the underdrains 1 and 1' separate from each other, but the flexible water stopper member 6 follows this and expands, and as the ground settles unevenly, the underdrain joint 2 stretches and undergoes shear deformation. .

In the above-mentioned embodiment, an example was shown in which the underdrain joint 2 was applied to the concrete underdrains 1 and 1'.
This culvert joint 2 can also be applied to culverts made of materials other than concrete. For example, the underdrain joint 2 may be applied to an underdrain made of steel or cast iron, or made of steel or cast iron and concrete.

Further, the cross-sectional shape of the underdrains 1 and 1' is not limited to a circle, but may be an ellipse, a quadrilateral, or a polygon. Moreover, the underdrains 1 and 1' may be formed as a single piece or may be constructed by combining divided members.
These points also apply to the underdrain joint 2.

Further, although the flexible water stop member 6 has an arcuate cross-section, it does not necessarily have to have this shape, and may have a bellows-like shape or the like. In short, the anchoring member 5,
It may have any shape as long as it can expand and contract with the relative displacement of 5' and maintain the water-stopping function. As explained above, in the present invention, anchoring members are attached to opposite ends of a pair of underdrains to be connected, and a flexible water-stopping member made of rubber, synthetic resin, etc. is installed between both anchoring members. The strut members are installed on the opposing surfaces of both anchoring members inside the flexible water-stopping member, and the opposing surfaces of the strut members are brought into contact with each other, so that the propulsion method can be used. When burying a culvert, the strut member can be used as a thrust receiver, and after burying, the strut member can be left as is and used as a load-bearing member to support the deformation of the flexible water-stopping member into the culvert due to external pressure such as earth pressure or water pressure. The number of steps required to complete a joint can be reduced compared to the conventional method.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an underdrain connected by the underdrain joint of the present invention. FIG. 2 is a sectional view taken along the - line in FIG. 1. 1, 1'...Drain, 2...Drain joint, 5,
5'...Anchoring member, 6...Flexible water stop member, 7,
7'...Strut member.

Claims (1)

[Claims] 1. In an underdrain joint in which anchoring members are attached to opposite ends of a pair of underdrains to be connected, and a flexible water-stopping member made of rubber, synthetic resin, etc. is straddled between each anchoring member. A joint for an underdrain, characterized in that strut members are respectively attached to opposing surfaces of each of the anchoring members on the inside of the water-retaining member, and the opposing surfaces of both strut members are brought into contact with each other.