JPH024302Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a joint for water-stop connection of underground conduits for water supply, sewerage, etc.

[Technical background of the invention and its problems]

Conventionally, joint sealing structures between structures such as concrete caisson, as shown in Utility Model Application No. 57-75040, have a flat fixed part and a seal part that bends at an obtuse angle on both sides from this fixed part and extends obliquely. A sealing rubber having a cross-section of There are known devices in which the wall surfaces are brought into close contact and the joints are sealed. However, when such a seal rubber is used for watertight connection of underdrains such as water and sewerage systems, the seal rubber is formed into a continuous annular body and fixed to the wall surface of one end of the underdrain to be connected, and the other adjacent The sealing portion is brought into close contact with the end wall surface of the underdrain to seal between the underdrains to be connected. However, in this case, there are the following problems. In other words, the seal rubber is formed into a continuous annular body, and includes an outer seal portion (indicated by 6 in Utility Model Application No. 57-75040) and an inner seal portion (indicated by 6').
When the outer seal part is pressed into close contact with the end wall surface of the other adjacent underdrain, the diameter measured in the diameter expansion direction, that is, at the tip of the annular outer seal part 6, is Since the outer seal part receives the force in the direction of expansion, the outer seal part is stretched by the tensile force and comes into close contact with the end wall of the culvert, but the inner seal part is pressed tightly against the end wall of the other culvert. If the underdrain is not cylindrical but has a cylindrical shape with a rectangular, polygonal, etc. In this case, the compressive force is concentrated at each corner, and there is a very high possibility that waving will occur in each corner. When such undulation occurs, the uniform adhesion of the seal rubber is reduced, causing a serious problem in that it causes leakage of internal fluid.

[Purpose of invention]

The present invention solves the problems of the conventional joint seal structure described above, and although it is a joint that has two seal parts, an outer seal part and an inner seal part formed in a continuous annular body, it An object of the present invention is to provide a joint for an underdrain that does not cause water leakage due to waving of an inner peripheral seal part when the seal part is crimped.

[Devised composition]

In order to achieve the above purpose, the joint of the present invention is
An annular continuous plate-shaped attachment part, an outer seal part that extends from the outer circumference of the attachment part to the opposite culvert side by slanting toward the outer circumference, and an inner circumference of the outer seal part that is integrated with the outer seal part. and an inner peripheral seal part that is continuous with the underdrain side and extends inwardly while being inclined toward the opposing underdrain side, and the outer peripheral seal part is provided with a space in which each seal part can deform when the end wall surface of the underdrain and each seal part are crimped. It is characterized in that the connection base between the seal portion and the inner seal portion is larger on the outer circumference side than on the inner circumference side. With this configuration, when the seal portion of the joint is crimped to the end wall surface of the opposing underdrain, a force is exerted by the outer seal portion to pull the inner seal portion toward the outer circumference (diameter expansion direction).
The inner circumferential seal portion is pulled up toward the outer circumferential side to prevent its deformation toward the inner circumferential side (diameter reduction direction).

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Figures 1 to 3 show an example in which an embodiment of the joint of the present invention is used for a cylindrical (one hollow part) underdrain with a square cross section. Figure 2 is a front view thereof, and Figure 1 is a FIG. 3 is a sectional view taken along line A-A in FIG. 2; Fitting A
is made of an elastic material such as rubber or synthetic resin, and in this embodiment is formed into a generally rectangular ring shape that matches the shape of the end wall surface of the underdrain B. The joint A includes a plate-shaped mounting part 1 that is continuous in an annular shape, an outer seal part 2 that is inclined from the outer circumferential position of the mounting part 1 toward the opposing underdrain B' side and extends in a diametrical direction toward the outer circumference, and the outer circumference of the fitting part 1. On the inner circumferential side of the seal part 2, the outer circumferential seal part 2 and the connection base 6 are continuously integrated, and the tip thereof is inclined toward the opposing underdrain B' side and extends inward (diameter reduction direction). 3. With this structure, the space in which each of the seal parts 2 and 3 can deform when the end wall surface of the underdrain and each seal part are crimped is larger on the outer circumferential side of the connection base 6 than on the inner circumferential side.

The joint A is fixed to the underdrain B with a fastener 5 such as an anchor bolt, with a backing plate 4 attached to the mounting part 1. In addition, it is preferable to provide a water stop line (water stop ridge) on the lower surface of the attachment part 1 on both sides of the anchor bolt.
It is preferable that the tip portions 2a, 3a of each of the seal portions 2, 3 are formed with an acute angle in cross section as shown in the figure in order to increase the degree of pressure contact during close contact and improve watertightness. In this way, the joint A is fixed to the end wall surface of one of the opposing underdrains B, and the other underculvert B' (see Fig. 3) is crimped to each seal part 2, 3, so that both underdrains B, Make a watertight connection between B′.

Next, the operation of the joint A having the above configuration will be explained.

In the joint A, the space in which each of the seal parts 2 and 3 can deform when crimped with the end wall surface is larger on the outer circumference side of the connection base 6 than on the inner circumference side.
3 is pressed against the opposing end wall surface of the underdrain B', the connection base 6 moves in the direction of the arrow C in FIG. While sliding along the wall surface in the direction of arrow D, the outer seal portion 2 falls toward the outer circumference (diameter expansion direction). Therefore, the inner seal part 3 connected to the connection base 6 is pulled toward the outer circumference by the outer seal part 2 falling toward the outer circumference in this way, and is pulled up to the outer circumference by following the outer seal part 2. , its deformation movement toward the inner circumferential side (in the direction of diameter reduction, that is, the direction in which the sealing material is compressed and waving occurs) is prevented. The seal parts 2 and 3 are both continuously connected to the outer circumferential side of the mounting part 1, and since no other member is interposed between the seal parts 2 and 3, the outer seal part 2 The force that pulls the inner circumferential seal portion 3 toward the outer circumferential side is effectively transmitted. Furthermore, since the seal parts 2 and 3 are both formed on the outer peripheral side of the mounting part 1, deformation of each seal part 2 and 3 toward the outer peripheral side, that is, in the diametrically expanding direction (the direction in which the seal material extends) is inhibited. On the contrary, the deformation of each of the seal parts 2 and 3 toward the inner circumference, that is, in the direction of diameter reduction, is restricted by the backing plate 4 attached to the attachment part 1 on the inner circumference.

Another embodiment of the invention is shown in FIG. In FIG. 4, the same parts as in FIG. 1 are designated by the same reference numerals and detailed explanation thereof will be omitted. The connection base 6 between the outer seal part 2 and the inner seal part 3 has a trapezoidal cross section, and the base end 3a of the inner seal part 3 has a notch 3b.
is provided, and the base end portion 3c is made thin. Further, the angle α formed by the outer circumferential seal portion 2 with respect to a perpendicular line E provided perpendicularly from the end wall surface of the culvert B is smaller than the angle β formed by the inner circumferential seal portion 3 with respect to the perpendicular line. For example, in the illustrated embodiment α=30°,
β=40°.

In this embodiment, since the angle α of the outer seal part 2 with respect to the perpendicular E is smaller than the angle β of the inner seal 3 with respect to the perpendicular E, the stiffness of the outer seal part 2 is stronger than that of the inner seal part 3. , when each of the seal parts 2 and 3 is crimped against the opposing end wall surface of the underdrain B', the inner seal part 3 is attached to the outer seal part 2.
When the outer seal part 2 pulls the inner seal part 3 toward the outer circumferential side, the followability of the inner seal part 3 is increased. In addition, the base end 3 of the inner peripheral seal portion 3
Making the proximal end portion 3c thinner by forming the notch 3b in the inner circumferential seal portion 3 further increases the ability of the inner circumferential seal portion 3 to follow the deformation of the outer circumferential seal portion 2 toward the outer circumferential side.

In order to improve the ability of the inner seal part 3 to follow the deformation of the outer seal part 2 toward the outer circumference, in addition to cutting a groove in the base end 3c as described above, the inner seal part 3 is made to face the base end 3c. The inner seal part 3 may be made thinner as a whole compared to the outer seal part 2, or the hardness of the rubber of the inner seal part 3 may be made softer than that of the outer seal part 2. good.

In the above embodiment, the underdrain is shown as a cylindrical body (with one hollow part) with a square cross section, but the underdrain is not limited to this, and the cross section is circular, a polygon other than a square, a horseshoe shape, an ellipse, etc. The number of hollow parts is not limited to one, and may be plural. Further, the underdrain may be a one-piece cylindrical body or an assembled cylindrical body consisting of a number of segments.

The joint A of the present invention can be used for water-stop connections to water/sewage systems, agricultural water supplies, public ditches, underground passages, tunnels, underground conduits, etc. made of concrete, steel, or a combination thereof.

[Effect of idea]

As described above, in the joint according to the present invention, both the outer peripheral seal part and the inner peripheral seal part are provided on the outer peripheral side of the mounting part, and the deformation allowable space of each seal part is set closer to the outer peripheral side than the inner peripheral side of the connection base. Since the inner circumferential seal part deforms to follow the deformation of the outer circumferential seal part toward the outer circumferential side when crimped to the end wall surface, the inner circumferential seal part deforms to the inner circumferential side, that is, in the compression direction where the sealing material is undulated. deformation is prevented, and water leakage due to undulation of the inner circumferential seal portion can be effectively prevented.
In addition, since each seal part is provided on the outer circumferential side of the mounting part, the width of the crimping part can be made significantly smaller than conventional ones, even when the wall thickness of the structure is relatively thin. It can be installed easily, and there will be no problem even if there is a difference in level between the structures after the joint is installed.

[Brief explanation of the drawing]

Fig. 1 is an enlarged cross-sectional view of a part of an embodiment of the underdrain joint of the present invention, Fig. 2 is a partially cutaway front view of the joint, and Fig. 3 shows the joints adjacent to each other. Diagram showing the state of watertight connection between culverts (Fig. 3A shows the state when the joint spacing between both structures is relatively wide, and Fig. 3B shows the state when the joint spacing is narrow), 4th The figure is an enlarged cross-sectional view of a part of another embodiment of the underdrain joint of the present invention. A...Joint, B, B'...Drain, 1...Mounting part,
2...Outer seal portion, 3...Inner seal portion, 6...
...Connection base.

Claims (1)

[Scope of utility model registration request] An annular continuous plate-shaped attachment part fixed to one of the opposing end walls of adjacent culverts with fasteners such as anchor bolts, and an outer periphery that slopes from the outer periphery of the attachment part to the opposite culvert side. an outer seal portion that extends toward the side, and an inner seal portion that is integrally connected to the outer seal portion on the inner circumference side of the outer seal portion, and extends inward while being inclined toward the opposing culvert side. , characterized in that the space in which each seal part can deform when the end wall surface of the culvert and each seal part are crimped is made larger on the outer circumferential side of the connection base between the outer circumferential seal part and the inner circumferential seal part than on the inner circumferential side. Underdrain joints made of elastic materials such as rubber and synthetic resin.