JPS60112933A - Joint for tubular underground structure - Google Patents

Abstract

PURPOSE:To prevent breaking of a seal plate due to a shift of a seamed part, by a method wherein a seal plate having a flexture at a central part positioned in a seam gap is secured to the seamed part of a tubular underground structure. CONSTITUTION:Two tubular underground structures 1 made of concrete are positioned opposite to each other with a seam gap 2 therebetween. A joint 3 is provided with a seal plate 4, press plates 5, underlay layers 6, and anchor bolts 7. The seal plate 4 is a rubber sheet wherein a reinforcing cloth 9 is buried, a flexible part 10 at a central part is positioned in the seam gap 2 and is expanded toward the outer periphery side of the tubular underground structure 1. The underlay plates 6, the seal plates 4, and the press plates 5 are secured by screwing a nut 11 on an anchor bolt 7. Even if a joint filler 12 is broken due to a change with time and a shift in a seam, since there is the margin of the length of the flexible part 10 of the seal plate 4, the seal plate 4 is prevented from breaking.

Description

Detailed Description of the Invention (Industrial Application Field 9) The present invention relates to a joint for a cylindrical underground structure constructed underground, and the cylindrical underground structure is used for, for example, a water pipe or a gas pipe. , used to house electric wires, etc.

(Prior art) When cylindrical underground structures are formed of concrete, a joint material such as rubber or asphalt-impregnated material is interposed in the joint gap as a joint when connecting the cylindrical underground structures in series. Simple joints that prevent earth and sand and groundwater from entering underground structures have been known in the past.However, with these joints,
Since the joint material is constantly exposed to high soil pressure or groundwater pressure, there is a risk that it may separate from the joint gap, and a high sealing function cannot be expected. If any deviation occurs, the joint material may come off, or if the joint material is hammered into the underground structure and fixed, the joint material may be severed, allowing a large amount of earth and groundwater to enter the underground structure, and making subsequent restoration difficult. The problem is that it is extremely difficult.

(Objective of the Invention 9) The present invention aims to improve the sole properties of joints for cylindrical underground structures. According to the fourth aspect of the present invention, in providing such a joint with high sealing performance, this joint can narrow the storage space of a cylindrical underground structure relic, The aim is to prevent interference with the contents of underground structures.

(Components of the Invention) The joint for a cylindrical underground structure according to the present invention has a sealing plate having a flexible portion in the center, a pair of retaining plates, and bolts as its main components.Both sides of the sealing plate The two cylindrical underground structures are pressed against the inner circumferential surfaces of two cylindrical underground structures facing each other with a circumferential gap by means of a holding plate, and together with this holding plate, both cylindrical underground structures 1 and 14 are fixed with bolts. The flexible portion of the seal bulges toward the outer periphery of the cylindrical underground structure in the gap.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

A cylindrical underground structure 1 is shown in FIG.

This underground structure 1 is made of concrete, and the two underground structures 1.1 are arranged facing each other with a joint gap 2 between them. Next, the specific structure of the joint of this underground structure 1.1 will be explained.

The joint 3 of this embodiment is shown in FIGS. 1, 2, and 3, and includes a seal plate 4, a holding plate 5.5, an underlay layer 6.6, and an anchor bolt 7.7. Underground structures 1.1
A cutout step 8.8 is formed at the inner end of the joint, and the anchor bolt 7 embedded in the underground structure 1.1 is inserted into the cutout step 8.8. .7 stands out.

The sealing plate 4 is a rubber notebook in which a reinforcing cloth 9 is embedded, and has a flexible portion 10 in the center, and both sides are flattened, and these both sides are covered with underlays that cover the cutout steps 8.8. It abuts layer 6.6. The central fold 1゛$10 is located in the joint gap 2 and bulges toward the outer circumference of the cylindrical underground structure 1.

The retainer plates 5.5 are made of hard materials such as metal, plastic, resin-impregnated plates, concrete, resin concrete, resin mortar, etc., or hard rubber, and are attached to both sides of the seal plate 4 from the inside. It is assigned.

The anchor bolt 7 passes through the underlayer 6, the sole plate 4, and the retainer plate 5, and these underlayer 6, the seal plate 4, and the retainer plate 5 are connected to the anchor bolt 7 by the nut 1.
1 and is fixed to the cylindrical underground structure 1. Further, a joint material 12 is interposed in the joint gap 2.

In this case, the underlayer 6 has the function of preventing a gap from forming between the cylindrical underground structure 1 and the seal plate 4, and the sole jfi, 4 has the function of preventing a gap from forming between the cylindrical underground structure 1 and the notch step 8 of the cylindrical underground structure 1. End face (g
It has the function of preventing damage due to direct contact with the edge part formed by forming a gap 2) with the 121 blood), and is made of elastic material such as rubber or resin. It is composed of things.

In the above-mentioned joint B, under normal conditions when the joint material 12 does not touch the underground structure 1.1, the joint material 12 bears the ground water pressure, but
When the sealing function of the joint material 12 weakens due to aging, etc., dirt and the like may enter the joint gap 2. In the case of burrowing, the seal plate 4 prevents earth and sand from entering the inside of the underground structure 1.

Even if the two underground structures 1.1 shift at the joint as shown in FIG. 3 due to uneven ground subsidence, earthquakes, etc., the seal plate 4 has sufficient length at the flexible portion 10. , the displacement of the underground structure 1.1 can be tolerated and rupture can be avoided. The seal plate 4 prevents earth and sand from entering the underground structure 1. Therefore, gas pipes, water pipes, electric wires, etc. inside the underground structure 1 are not damaged, and restoration work can be carried out from inside the underground structure 1 after the fact.

In addition, as a means for bending and holding the flexible portion 10 of the seal plate 4 toward the outer circumferential side of the cylindrical underground structure 1, the opposing ends of the retaining plate 5.5 are made to protrude toward the joint gap 2 side, and the flexible portion 10
In this method, the bending force of the flexible part 10 is increased and the cylindrical underground structure 1 is bulged out to the outer circumferential side, and the area of the flexible part 10 that receives earth pressure in the joint gap 2 is increased, and the surface pressure is reduced. The flexible part 10 is held by the cylindrical underground structure 1.1 and returns to the opposite direction, making it difficult to deform. It can be used in

Further, in the above embodiment, the reinforcing cloth is embedded in the sole plate, but the reinforcing fabric may not be embedded in the sole plate.

Further, the amount of deflection of the flexible portion of the seal plate can be changed and set as appropriate as necessary.

Furthermore, although the above embodiments relate to joints for cylindrical underground structures made of concrete, the present invention can also be applied to underground structures made of steel or plastic by using ordinary bolts instead of anchor bolts.

(Effects of the Invention) According to the present invention, even if two cylindrical underground structures connected to each other are displaced due to uneven ground subsidence, earthquakes, etc., the seal plate allows this displacement at the flexible portion. This prevents breakage, prevents earth and sand from entering the cylindrical underground structure, and facilitates recovery after the fact.

In addition, since the above-mentioned flexible portion is located in the joint gap and bulges toward the outer circumference of the cylindrical underground structure, it does not reduce the accommodation space of the cylindrical underground structure or interfere with the contents contained therein. .

[Brief explanation of the drawing]

Figure 1 is a perspective view showing a partial cross-section of the underground structure, Figure 2 is a longitudinal cross-sectional view showing the joints of the same structure, and Figure 3 is a cross-sectional view showing the state of the joints in the same structure in the event of an abnormality. be. 1... Underground structure, 2... Joint gap,
6...Joint, 4...Seal plate, 5...
... Holding plate, 7 ... Anchor bolt, 10
・・・・・・Flexible part Fig. 3

Claims (1)

[Claims] (1) At the joint between two cylindrical underground structures that face each other with a gap between them, both sides of the seal plate having a flexible portion in the center are presser plates, and the inner peripheries of both cylindrical underground structures have a gap between them. 1. A joint for a cylindrical underground structure, characterized in that the seal plate is fixed with bolts in a state in which the two faces are pressed against each other, and the flexible portion of the seal plate bulges toward the outer circumference of the cylindrical underground structure in the gap.