JPS6043543A - Joint of cylindrical underground structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a joint for a concrete cylindrical underground structure constructed underground, and the cylindrical underground structure is used for accommodating, for example, water pipes, gas pipes, electric wires, etc. It is something.

In conventional joints of this type, a flexible sealing member such as rubber, synthetic resin, asphalt-impregnated material (elastite, etc.) is interposed between the opposing end faces of the structures to be connected, and a A structure was adopted to prevent groundwater from entering.However, in this case, the sealing member is always directly exposed to considerable earth pressure and groundwater pressure on its outer periphery, so there is no possibility that the sealing member will be damaged. Furthermore, when the ground subsides unevenly or an earthquake occurs, the connected end faces may shift or separate, causing the seal member to rupture or break, resulting in a large amount of soil and groundwater leaking out. There was a problem in that the attackers were able to infiltrate the inside of the building, making recovery after the fact extremely difficult.

The purpose of the present invention is to solve these problems, to have excellent watertightness, to be able to sufficiently resist earth pressure and underground water pressure under normal conditions, and to sufficiently absorb deformation during abnormalities such as earthquakes and unequal conditions. The aim is to provide flexible fittings.

The basic structure of the present invention is a joint that seals between opposing open ends of concrete cylindrical underground structures to be connected, which has a flexible part in the center and protrusions on both sides. It includes a sealing means, a support means for holding the flexible portion of the sealing means in a flexible state, and a band-shaped suppression plate that presses the protrusion of the sealing means against the inner circumferential surface of the opening end. This joint for a cylindrical underground structure is characterized in that the protrusion of the sealing means is pressed against the inner circumferential surface of the opening end.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

The structures 1a and 1b are concrete cylindrical bodies with a square cross section built underground, and the open ends 2a12b to be connected are symmetrical to each other and face each other through a gap 6. ing. The gap 3 is filled with a joint material 4 made of asphalt, rubber, soft synthetic resin, or the like. Each open end 2
a + 2 b has end faces 5a,' along its inner circumferential wall.
Concave portions 6a, 7a, 6b are formed stepwise inward from 5b in the direction "p".
, 7b are formed, and a plurality of anchor bolts 8 are embedded in the inner circumferential walls of the recesses 7a and 7b, and nuts 9 are screwed into the anchor bolts 8. Open end 2a, (2b
), as shown in FIG.
7a (6D,, 7b) in formwork 10 manufactured according to
If a predetermined number of anchor bolts 8 are appropriately fixed in advance, and concrete is poured while holding the formwork 10 with retaining materials 11 provided between the anchor bolts 8, the inner peripheral wall of the four parts 7a + 7b In the meantime, the sealing means 12 and the supporting means 16 inside the sealing means 12 were assembled into a double cylinder shape and fixed by a pressing plate 14.

The sealing means is a plate-like body made of an elastic material such as rubber or synthetic resin, and a reinforcing cloth 12a is embedded therein, and the sealing means is provided on both sides of the flexible section 15 with a corrugated cross section in the circumferential direction of the cylindrical underground structures 1a and ib. A protruding portion 17 having a protrusion of 16 degrees is formed.

The support means 13 is a plate-like body made of an elastic material such as rubber or synthetic resin, and has a reinforcing cloth 13a buried therein, and has protrusions extending in the circumferential direction of the cylindrical underground structures ia and ib on both sides of the support part 18. A mounting portion 20 having 19 is formed. Note that the support portion 18 is the structure 1a.

In order to allow slight expansion and contraction of 1b, it may be slightly bent as shown by the chain line in FIG.

The press plate 14 is a metal strip-shaped member, and protrusions 21 are formed on both ends of the press surface in the longitudinal direction. Note that the protrusion 21 may be provided only on one edge of the press plate 14.

Flexible portion 15 of sealing means 12 and support portion 1 of support means 16
8 forms a so-called double wall structure consisting of a flexible outer wall and an inner wall, and is housed in the four parts 7a and 7b. On the other hand, the attachment portion 17 of the sealing means 12 and the attachment portion 2o of the support means 16 are superimposed and crimped onto the inner circumferential walls of the recesses 7a and 7b by anchor bolts 8 and nuts 9 via the pressing plate 14. At that time, each of the protrusions 16, 19, 21 is directed toward the inner circumferential wall of the recesses 7a, 7b, and locally exerts strong pressure on the surface of the other party that comes into contact with it. This is significantly better than the case.

Under normal conditions, the joint material 4 bears earth pressure and groundwater pressure, but even if for some reason earth and sand or groundwater passes through the joint material 4 and enters the recesses 6a and 6b, it will be blocked by the sealing means 12. , there is no risk of it leaking into the structures 1a, 1b. At this time, the earth pressure and underground water pressure acting on the flexible part 15 are borne by the inner support part 18, since the flexible part 15 deforms with almost no resistance, and the shape of the joint part is maintained normally. Note that even if the structures ia and ib expand and contract slightly due to temperature changes, the expansion and contraction is absorbed by the deformation and bending of the support means 13.

Next, in an abnormal situation such as uneven ground subsidence or an earthquake, a shift or separation occurs between the opening ends 2a and 2b, as shown in FIG. As long as the amount is small, it will be absorbed by the elastic deformation of the flexible portion 15 and the support portion 18 and there will be no problem, but if the amount is large, the support portion 18 will not be able to fully deform and will be cut. However, since the flexible portion 15 has a corrugated cross-section and is highly flexible, it is not sufficiently deformed and cut, and can withstand earth pressure and groundwater pressure to prevent the intrusion of earth and sand and groundwater.

Further, FIG. 3 shows an embodiment in which a supporting means is molded onto the sealing means. The sealing means 22 is a plate-shaped body made of an elastic material such as rubber or synthetic resin, and has a mounting portion 25 having a plurality of protrusions 24 formed on both sides of an intermediate portion 23 having an arcuate cross section. The surface having the protrusion 24 is inserted into the recesses 7a and 7 by the anchor bolt 8 and nut 9 through the suppression plate 14.
It is crimped to the inner circumferential wall of b. In the intermediate part 23 -,
The circular arc portion forms a flexible portion 26, and the straight portion forms a support means 27, and each has the same effect as the flexible portion 15 of the sealing means 12 and the support portion 18 of the support means 16. There is.

Although the present invention is configured as described above, since the protrusion is formed on the receiving surface of the receiving portion of the sealing means, watertightness is extremely excellent. In addition, since the sealing means and the supporting means form a so-called double wall structure consisting of a flexible outer wall and a rigid inner wall, the sealing means does not bear earth pressure or underground water pressure under normal conditions, so there is no risk of damage. , complete watertightness is maintained, and even if the support means is severed due to slippage or separation of the connection in the event of an abnormality, the sealing means will be sufficiently deformed to absorb the slippage or separation, and will also prevent earth pressure and groundwater. Since it bears the pressure, it can prevent the intrusion of earth, sand and groundwater. Therefore, recovery after the fact is also easy.

[Brief explanation of drawings]

Figure 1 is a perspective view of the cylindrical underground structure to be connected;
The figure is a sectional view of a joint of a cylindrical underground structure showing an embodiment of the present invention, FIG. 3 is a sectional view showing a method of constructing an open end of the structure to be connected, and FIG. FIG. 5 is a perspective view of the seal means, support means, and suppressing plate used; FIG. 5 is a cross-sectional view showing the state of the connection portion in an abnormal situation; FIG. 3 is a cross-sectional view showing another embodiment of the present invention.

Claims (1)

[Claims] (1) A joint that seals between opposing open ends of concrete cylindrical underground structures to be connected, which has a flexible part in the center and a flexible part on both sides that extends in the circumferential direction of the cylindrical underground structure. A sealing means having an extending protrusion, a support means for holding a flexible portion of the sealing means in a deflected state, and a band-shaped suppression plate for pressing the protrusion of the sealing means against an inner circumferential surface of an opening end. A joint for a cylindrical underground structure, characterized in that a protrusion of a sealing means is pressed against an inner circumferential surface of an open end using an anchor bolt.