JPS5930306Y2 - Underdrain flexible expansion joint - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a joint for concrete culverts used in water supply and sewerage systems, public ditches, underground passages, etc.

Conventionally, as joints for concrete underdrains, flexible members made of rubber, synthetic resin, etc. are used, and the flexible members are formed into a short cylindrical shape along the inner circumferential surface of the underdrains as a whole, and both ends of the flexible members are Anchored on the inner peripheral wall of a culvert with opposite parts,
Alternatively, by installing a bolt on the back of the flexible member and suspending a part of the flexible member from the bolt, both culverts can be connected, and the distortion of the flexible member due to the difference in water pressure between the inside and outside of the culvert can be minimized. I tried to suppress it.

However, when using any type of joint, due to the progress of uneven settlement of the culvert, the opposing culverts are separated in the axial direction under the influence of external forces, creating a large gap between the culverts. Earth and sand from the outside of the culvert entered between the culverts, causing the flexible member to swell and protrude inside the culvert, resulting in a decrease in durability and destruction of the flexible member.

Further, when the flexible member bulges out into the outflow path of the underdrain due to deformation of the flexible member, a problem arises in that the flow within the underdrain is obstructed by the bulged portion.

This invention was developed to eliminate these inconveniences, and has sufficient ability to follow uneven settlement and expansion/contraction between culverts, and prevents joints from breaking due to unexpected external forces that are applied to the joints, including during earthquakes. The purpose of the present invention is to provide a flexible expansion joint for a culvert that prevents water damage, maintains good water-stopping properties against internal pressure from internal water in the culvert, and external pressure from external water and earth, and does not impede the flow of internal water. It is something.

An embodiment of the flexible expansion joint for an underdrain according to the present invention will be described below with reference to the drawings.

In the figure, reference numerals 1 and 1' indicate concrete underdrains to be connected, which are made of square or circular concrete cylinders, and are placed facing each other at a constant interval.

The flexible expansion joint of the underdrain is interposed between the underdrains 1 and 1'.

Annular anchoring members 2, 2' made of a rigid body such as metal or synthetic resin are provided at the ends of the underdrains 1, 1'.

The anchoring members 2, 2' are integrally attached to annular end surfaces 2a, 2a' provided along the end surfaces of the underdrains 1, 1', and outer peripheral ends of the end surfaces 2a, 2a'. An annular outer circumference 2 b , 2 provided and embedded within the underdrain 1.1′
It consists of b'.

That is, the annular end surface portion 2a. 2 a' is the annular outer peripheral part 2
b, 2b' are integrally provided at one end toward the center.

In the figure, the annular outer circumferential portions 2 b and 2 b' are shown perpendicular to the end surface portions 2 a and 2 a', but they may be oblique to each other.

One end of an anchor 3, 3' is fixedly attached to the anchoring member 2, 2'. This is to make the fixation of z to the underdrains 1 and 1' strong.

A water stop material 4 is attached to the anchoring members 2, 2' so as to straddle both.

The water stop material 4 is formed of a short cylindrical body made of a flexible member such as rubber or synthetic resin, and the side wall of the short cylindrical body is formed in a U-shape in cross section at the center, so that the water stop material 4 is made of a flexible material such as rubber or synthetic resin. A recess 10 is formed with an opening.

The inner circumferential surface of the water-stopping material 4 at the position of the recess 10 of the water-stopping material 4 is formed to have substantially the same inner diameter as the inner surface and the inner circumferential surface of the end surfaces @2a, 2a' of the culvert 1.1'. , culvert 1,1'
This is to avoid increasing the flow resistance within.

Both ends 4 a and 4 a' of the water stop material 4 are attached to the anchoring member 2
．． It is fitted onto the outer periphery of the annular outer circumferential portions 2b, 2b' of Z, and is fastened by contact plates 5, 5' and fasteners 6, 6' such as bolts and nuts.

Both ends 4 a and 4 a' of the water stop material 4 are attached to the anchoring member 2
, 2' are embedded in the concrete culverts 1, 1' together with the annular outer peripheral parts 2b, 2b'.

Both ends 4a of the water stop material 4. An annular protrusion 7° 7' is formed on the outer periphery of the end of 4 a' to prevent it from coming off, and when tension is applied to the retaining lumber 4 after construction, it engages with the backing plates 5 and 5'. This is to prevent it from coming off.

In addition, a reinforcing cloth 8 is embedded inside the water stop material 4 to prevent the water stop material 4 from stretching excessively when external force is applied, and to prevent earth pressure.

It is designed to sufficiently support external pressure such as external water pressure and prevent damage to the water stop material 4.

On the outside of the water stop material 4, a joint material 9 made of a foam such as rubber or synthetic resin is provided so as to fit into the recess 10 of the water stop material 4.

Since the flexible expansion joint for the underdrain of the present invention has the above-described configuration, it has the following functions and effects.

(b) By forming the middle part of the water stop material in a shape that follows the end surface of the anchoring member, the water stop material 4 is formed from a short cylindrical body with a U-shaped cross section, and both ends are shaped like the annular shape of the anchor member 2. Outer periphery 2b, 2b'
Since it is fastened to the outer periphery of the underdrain, it has a large supporting force against external pressure such as soil pressure and external water pressure, and can sufficiently follow displacements in the longitudinal direction and shear direction between the underdrains.

Also, both ends 4a of the water stop material 4. 4a' is embedded in the concrete culverts 1, 1' together with the annular outer circumferential parts 2b, 2b' of the anchoring member 2, so that even when external pressure is high, the water-stopping property does not deteriorate, and good water-stopping property is achieved. can be maintained.

(b) Since the joint material 9 is fitted into the recess 10 provided in the middle of the water stop material 4, earth and sand will not enter between the opposing underdrains 1.1'. The gap between 1' and 1' is not blocked, the displacement between culvert 1 and 1' is not obstructed, and the water stop material 4 is not damaged by debris in the earth and sand.

(/→ When reinforcing cloth is embedded inside the water stop material 4, it will not be excessively deformed due to external pressure, and its supporting capacity is large, so that the water stop material 4 receives external pressure and flows into the water channel in the culvert. This prevents the culvert from bulging out, and the flow within the culvert is not obstructed.

(b) Since the part of the water stop material in which the recess is formed is placed along the end face of the anchoring member, it is possible to prevent the part in which the recess is formed from coming into direct contact with the rough end face of the concrete culvert.

As a result, even if the part of the waterproofing material that forms the recess is deformed toward the center of the waterstopping material by external water pressure, the part that forms the recess will move directly on the rough surface of the concrete culvert, causing wear and tear. It is possible to reliably prevent this portion from being damaged by external water pressure, which would reduce the strength of the portion where the recessed portion is formed.

Note that anchoring members are usually made of metal such as iron, which has a much smoother surface than concrete.
Even if the concave portion of the water stop material slides on the end face of the anchoring member, the amount of wear is much smaller than when it slides on the concrete culvert.

That is, by arranging the portion of the water stop material in which the concave portion is formed along the end face portion of the anchoring member, wear of this portion can be almost eliminated.

(e) Anchoring members 2゜2 at the ends of opposing underdrains 1 and 1'
' is provided at the end surface portion 2a of the anchoring member 2.

Since the ends of the underdrains 1 and 1' are protected by the underdrains 2a', the ends of the underdrains 1 and 1' are not damaged by contact between the underdrains 1 and 1'.

(f) Since the inner circumferential surface of the water-stopping material 4 at the position of the recess 10 of the water-stopping material 4 is formed to have the same inner circumferential surface as the inner circumferential surface of the underdrains 1 and 1', 1.1' does not impede the flow of running water and does not increase flow resistance.

As described above, the flexible expansion joint for an underdrain according to the present invention has a simple structure and many advantages, and is therefore economically superior.

[Brief explanation of the drawing]

The figure is a partially cutaway sectional view of an embodiment of the present invention. 1.1'...culvert, 2. z... Anchoring member, 2a. 2a'... End face part, 2b, 2b'...
Annular outer peripheral portion, 4...Water stop material, 8...Reinforcement cloth, 9...Gout material, 10...Recessed portion.

Claims (1)

[Claims for Utility Model Registration] A pair of anchoring members each comprising an annular outer periphery and an annular end face integrally provided at one end of the annular outer periphery toward the center; The end surfaces of the members are arranged to face each other at intervals,
Both ends of a short cylindrical water stop material made of rubber, synthetic resin, etc. are fitted to each annular outer periphery of the pair of anchoring members, and the middle part of the water stop material is formed into a shape that follows the both end surfaces. Then, an annular recess is formed that opens toward the outer periphery of the intermediate portion of the water stop material, and the inner peripheral surface of the water stop material at the position of the recess is approximately aligned with the end surface and the inner peripheral surface of the underdrain to be connected. Forming the same inner diameter, both ends of the water stop material are fastened to each of the annular outer peripheral parts,
Flexible expansion and contraction of the underdrain, characterized in that a joint material is fitted and held in the recess of the water-stopping material, and each of the annular outer peripheries and both ends of the water-stopping material are buried and fixed in opposing ends of the underdrain. Fittings.