JPS60208688A - 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 (Field of Industrial Application) The present invention relates to a joint for a cylindrical underground structure constructed underground, and the cylindrical underground structure is, for example, a joint for a water pipe. It is used to house gas pipes, electric wires, etc.

(Prior art) When the cylindrical underground structures are made of concrete, joints for connecting the cylindrical underground structures in series are made by interposing a joint material such as comb or asphalt-impregnated material in the joint gap. Simple joints are known that prevent dirt and groundwater from entering structures.

However, with this joint, high sealing performance cannot be expected because the joint material is constantly exposed to crystallized earth pressure or underground pressure, so there is a risk that the joint gap will come off or break. In addition, if the joints of underground structures shift due to uneven ground subsidence, earthquakes, etc., the joint material may become detached, or if the joint material is embedded and fixed in the underground structure, the joint material may become loose. There is a problem in that a large amount of earth and sand and groundwater intrude into the underground structure, making subsequent restoration extremely difficult.

(Object of the Invention) The present invention provides a joint for a cylindrical underground structure, which includes a first seal plate that prevents the intrusion of earth and sand and groundwater when the ground is normal, and a first seal plate that prevents the intrusion of earth and sand and groundwater when the ground is in an abnormal state such as uneven subsidence. The basic purpose of the present invention is to provide a first seal plate that receives earth and sand and groundwater when cutting, and to ensure sealing performance in such abnormal situations.Another important purpose of the present invention is to ensure sealing performance during normal times. The purpose is to prevent the first seal plate, which ensures sealing performance, from expanding and deforming inwardly into the underground structure due to the influence of earth pressure and underground water pressure. If this continues, damage due to the effects of earth and sand and groundwater will progress rapidly and there is a risk of cutting. In this case, the second ring plate, which should provide sealing performance in the event of an abnormality, will receive earth and sand during normal times and deteriorate quickly. Therefore, there is a concern that in an abnormal situation, it may be cut due to the impact of ground movement.The present invention is an attempt to solve this problem.

(Components of the Invention) The joint for a cylindrical underground structure of the present invention has a seventh and second seal plate, a pair of pressure plates, and a pair of presser plates as main components.

Both sides of the first seal plate are brought into contact with the inner peripheral surface of the cylindrical underground structure across the joint gap. The pair of pressure plates are stacked on both sides of the first seal plate, respectively, with a gap provided at the seam clearance position. The 27th rule plate has a flexible portion in the center, and both sides thereof are stacked on the pressure plate. Further, the presser plates are stacked on both sides of the second seal plate. The both sides of the first seal plate, the pressure plate, the both sides of the second seal plate, and the presser plate are fixed to the cylindrical underground structure in a stacked state. At least one of the above-mentioned pressure plates protrudes from its end toward the clearance side, thereby preventing the seventh seal plate from expanding and deforming within the cylindrical underground structure due to earth pressure or water pressure. That's what I do.

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

FIG. 1 shows a cylindrical underground structure 1.1 made of concrete. Both underground structures 1.1 are arranged facing each other with a joint gap 2 between them, and are connected by a joint.

FIGS. 2 and 3 show the specific structure of the above-mentioned joint B. This joint 6 is connected to the pressure plate 5 of the pair of first seal plate floors.
．． 5. The main components are a second sole plate 6, a pair of presser plates 7.7, and an anchor bolt 8.8. Underground structure 1
．． 1 has a cutout step 9.9 formed at the inner end of the joint, and an anchor bolt 8.8 embedded in the underground structure 1.1 is inserted into the cutout step 9.9. It stands out.

The first seal plate 4 and the second sole plate 6 are both made of rubber sheets with reinforcing cloths 10 and 10 embedded therein, and the pressure plate 5 and the presser plate 7 are made of steel plates. of course,
Both seal plates 4.6 may be composed of a rubber sheet or a synthetic resin sheet without reinforcing cloth, and the pressure plate 5 and the presser plate 7
may be made of other hard materials such as metal plates other than steel plates, plastic plates, resin-impregnated plates, concrete plates, resin concrete plates, resin mortar plates, and hard rubber plates.

The first seal plate 4 is in contact with the cutout steps 9.9 on both sides with a slight flexure 11 provided in the seam clearance 2. The pressure plates 5.5 are stacked on both sides of the first seal plate 4, with a gap 12 provided at the position of the seam clearance 2. Second
The seal plate 6 has a large bending portion 16 in the center, and its both sides are stacked on the pressure plates 5.5, respectively.

The holding plates 7.7 are stacked on both sides of the second sealing plate 6, respectively.

The anchor bolt 8 passes through both of the above-mentioned two-way plates 4.6, the pressure plate 5, and the holding plate 7, and the first seal plate 4.
, the pressure plates 5.5, both sides of the second sole &6, and the press plate 7.7 are fixed to the underground structure 1 in a laminated state by applying nuts 14 to the anchor bolts 8.

The width W of the gap 12 in the pressure plate 5.5 is set smaller than the dimension t, which is the thickness t of the first rule plate 4 multiplied by t. Note that a joint filler 15 is interposed in the joint gap 2.

In the above-mentioned joint 6, when the underground structure 1.1 is in normal condition with no displacement, the joint material 15 bears the earth pressure and groundwater pressure.
When the sealing function of the joint material 15 weakens due to aging, etc., dirt and the like enter the joint space 2. In such a case, the first seal plate 4 prevents dirt and the like from entering the inside of the underground structure 1.

At this time, earth pressure and groundwater pressure are received by the pressure plate 5, and the first
The sealing plate 4 is supported by the pressure-resistant plate 5 and does not extend and bulge inward of the underground structure 1. Air gap 1 of pressure plate 5.5
The reason why the relationship between the width W of the first seal plate 2 and the thickness t of the first seal plate 4 is set to w<ft is to prevent the first seal plate 4 from bulging out from the gap 12. If it cannot pass through the gap 12 in a bent state, the above-mentioned bulge will be prevented.

In this case, the dimensions of the W cut t are determined because when the first seal plate 14 is bent, a radius (RJ) is formed at the bent part, and a space with a width of about 2 is created inside the bent part. This takes into consideration the plate thickness tx,2 and the space width 2t.However, the space width inside the bent portion changes depending on the properties of the first seal plate 14 (physical properties of the rubber and reinforcing cloth, and the presence or absence of the reinforcing cloth), and W may be larger than pt. 4 above.
1t was obtained from experimental values without reinforcing cloth.

However, due to uneven ground subsidence, earthquakes, etc., underground structures 1
．． 1 shifts as shown in FIG. 3 (at the time of abnormality), the first seal plate 4 breaks. At this time, the pressure plate 5.5 has the air gap 12
Since it is located at the 2nd position between the seam gaps, the above-mentioned deviation movement is allowed. Since the second seal plate 6 has a sufficient length in the deflection 16, it allows the displacement of the underground structure 1.1,
This second seal plate 6 prevents earth and sand from entering the inside of the underground structure 1 while avoiding the breakage. 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.

Note that the shape and amount of deflection of the deflection portion of the first seal plate can be appropriately changed and set as necessary. Further, when the cylindrical underground structure is made of steel or plastic, ordinary bolts can be used instead of anchor bolts.

Further, in the above embodiment, only the pressure plate on one side was made to protrude toward the play area, but the pressure plates on both sides may be made to protrude toward the play area.

(Effects of the Invention) According to the present invention, since the first seal plate and the second seal plate have a double seal structure, even if the underground structure becomes misaligned, the intrusion of earth and sand into the underground structure is ensured. can be prevented. Since a pair of pressure plates are provided and at least one of the pressure plates is made to protrude toward the play area, ground water pressure is absorbed by the pressure plates, and the first seal plate prevents the expansion into the underground structure. from occurring. Therefore, the problem of the first seal plate being in a state of elongation and deformation resulting in rapid aging is resolved, and the second seal plate can be maintained in its original state, and the second seal plate can be maintained in its original state when the first seal is broken. The second seal plate reliably performs its sealing function, prevents the invasion of underground structures such as earth and sand in the event of an abnormality, and facilitates recovery after the fact.

[Brief explanation of drawings]

The drawings illustrate embodiments of the present invention; FIG. 1 is a perspective view showing a partial cross section of an underground structure, FIG. 2 is a vertical sectional view showing a joint of the same structure, and FIG. 3 shows an abnormality in the joint. FIG. DESCRIPTION OF SYMBOLS 1...Tubular underground structure, 2...Joint gap, 6...Joint, 4...First seal plate, 5
...Pressure plate, 6...Second seal plate, 7...
... Holding plate, 8 ... Anchor bolt, 12 ...
...Gap, 16...Flexible part Fig. 7 Fig. 2 - Fig. 3

Claims (1)

[Claims] (υ At the joint between the cylindrical underground structures that face each other with a clearance, both sides of the first seal plate are in contact with the inner peripheral surfaces of both cylindrical underground structures across the clearance, and the first On both sides of the seal plate, each of a pair of pressure plates with a gap provided at the free space position, a second plate having a flexible portion in the center, both sides of the second rule plate, and a presser plate are stacked in order. , both sides of the first sole plate, the pressure plate, both sides of the second sole plate, and the holding plate are fixed to the cylindrical underground structure in a laminated state with bolts, and at least one of the pressure plates is fixed to the cylindrical underground structure with bolts. A joint for a cylindrical underground structure, characterized in that the first seal plate protrudes toward the play area to prevent the first seal plate from coming out inward of the cylindrical underground structure.