JPH0248693B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a joint for a cylindrical underground structure constructed underground, and the cylindrical underground structure is used for connecting, for example, water pipes, gas pipes, and electric wires. It is used for housing such as.

(Prior art) As a joint for cylindrical underground structures, an internal water stop member formed of an elastic material is installed on the inner peripheral surface of the ends of a pair of cylindrical underground structures provided with a gap between them. Overlap and abut both sides of each external water stop member,
It is known to fix with bolts via a holding plate (see, for example, Japanese Patent Laid-Open No. 193636/1983).
In this structure, a flexible part is formed in the center of the external water-stopping member, and the internal water-stopping member holds the flexible part by providing cavities extending in the circumferential direction of the cylindrical underground structure at both sides of the flexible part. are doing. Therefore, when both cylindrical underground structures shift in a direction perpendicular to their longitudinal direction due to uneven subsidence of the ground, this shift is accommodated by the above-mentioned flexure portion.

Furthermore, in Japanese Patent Publication No. 56-19421, both sides of a single sealing plate having a flexible portion in the center are fixed to the inner circumferential surfaces of the ends of a pair of cylindrical underground structures with bolts, and the flexible portion is A cylindrical underground structure covered from the inside with a cover plate is described.

(Problem to be Solved by the Invention) However, in the case of the technique described in the above-mentioned Japanese Patent Application Laid-Open No. 193636/1983, the flexible portion that should allow the displacement of the opposing cylindrical underground structures is Because the structure is installed in a water-stopping member), due to long-term use, it may become constantly wet due to groundwater entering through the gap between the above-mentioned cylindrical underground structures, resulting in aging, or may be damaged by earth and sand entering through the above-mentioned gap. or

In that case, if a large shift occurs between the two cylindrical underground structures due to the above-mentioned uneven settlement, the flexible portion may be able to tolerate this shift in length, but at the same time, when subjected to high water pressure or earth pressure, Unable to withstand this, it breaks, resulting in the intrusion of groundwater and earth and sand into the cylindrical underground structure. In addition,
In this case, although the internal water stop member can tolerate slight displacement due to deformation of the cavity, there is a limit to the amount of tolerance, and it is difficult to allow large displacement.

In addition, in the case of the technology described in Japanese Patent Publication No. 19421/1983, the cover plate prevents the flexible portion of the seal plate from being accidentally damaged during piping, wiring, etc. work in a cylindrical underground structure. , it is not useful to prevent this flexible portion from deteriorating or being damaged due to the influence of groundwater or earth and sand.

In other words, an object of the present invention is to protect the flexible portion of the seal plate from the inside and outside, and prevent underground water and water from flowing into the cylindrical underground structure without causing the flexible portion to break even in abnormal situations such as uneven ground subsidence. The purpose is to ensure that the intrusion of earth and sand can be prevented.

(Means for Solving the Problems) A joint for cylindrical underground structures according to the present invention is provided on the inner peripheral surface side of both cylindrical underground structures at the joint portion of the cylindrical underground structures facing each other with a gap. The first seal plate and the second seal plate, which are separate from each other, each straddle the gap, and overlap each other on both sides so that the first seal plate is located on the side of the cylindrical underground structure. The both sides of the two seal plates are fixed to both cylindrical underground structures with bolts via the holding plates that are in contact with the second seal plate from the inner circumferential side, respectively. The attachment part of the cover plate is attached to the holding plate, and the second sealing plate has a central part that is not held down by both of the holding plates, and is made longer than the central part of the first sealing plate to form a cylindrical underground. The present invention is characterized in that it includes a flexible portion bent toward the inside of the structure, and the cover plate includes a cover portion that covers the flexible portion from the inside of the cylindrical underground structure.

(Function) In the joint of the cylindrical underground structures described above, even if groundwater or earth and sand infiltrates from the gap between the two cylindrical underground structures, this groundwater and earth and sand are blocked by the first seal plate,
The second seal plate will not become wet and will not age or be damaged. The flexible portion of the second seal plate is bent toward the inside of the cylindrical underground structure, and the cover portion of the cover plate covers and protects this bent portion.

(Effect of the invention) Therefore, according to the present invention, the second
Since the seal plate is located inside the cylindrical underground structure rather than the first seal plate, the first seal plate protects the second seal plate from groundwater and earth and sand,
Therefore, the above-mentioned flexible portion of the second seal plate will not be damaged by aging due to groundwater or damage from earth and sand, and since this flexible portion is covered by the cover portion of the cover plate, the inside of the cylindrical underground structure will not be damaged. This also prevents accidental damage to the flexible portion when performing piping, wiring, etc. work. Therefore, even if a relative displacement occurs between the two cylindrical underground structures due to uneven settlement, etc., and high earth pressure or water pressure is applied, the flexible part can absorb this without breaking, and the inside of the cylindrical underground structure Prevents the intrusion of earth and sand into the area and facilitates recovery after the fact. Furthermore, even when the second seal plate is provided with multiple flexible parts (see Figure 4), these can be held by the cover plate to prevent the entire length from protruding into the cylindrical underground structure. can be made longer without narrowing the internal space of the cylindrical underground structure.
It becomes possible to allow relative displacement without difficulty.

(Example) Hereinafter, an example of the present invention will be described based on 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, this underground structure 1,
The specific structure of the first joint will be explained.

Example 1 This example is illustrated in FIGS. 2 and 3. The joint 3 of this example has a first seal plate 4, a second seal plate 5, presser plates 6, 6, a cover plate 16, and anchor bolts 7, 7 as main components. The underground structures 1, 1 have cutout steps 8, 8 formed at the inner circumferential ends of their joints, and these cutout steps 8, 8 have grooves embedded in the underground structures 1, 1. However, the anchor bolts 7, 7 are protruding.

The first seal plate 4 is a rubber sheet with a reinforcing cloth 9 embedded therein, and both sides thereof are in contact with the notch steps 8, 8 with a slight flexure 10 provided in the joint gap 2.

Like the first seal plate 4, the second seal plate 5 is a rubber sheet containing a reinforcing cloth 11, and has a large inward bending part 12 in the center, and the first seal plate
It is in contact with both sides of the seal plate 4.

The holding plates 6, 6 are both made of metal, plastic,
resin impregnated board, concrete, resin concrete,
It is made of a hard material such as resin mortar or hard rubber, and is applied to both sides of the second seal plate 5 from the inside.

That is, both the seal plates 4 and 5 are separate bodies, and both sides of the seal plate 4 are placed on top of each other with the first seal plate 4 facing the cylindrical underground structure 1, and are held down by the holding plates 6 and 6. The second seal plate 5 is longer than the first seal plate 4 in the central portion where the second seal plate 5 is not open. In other words, the flexible portion 12 of the second seal plate 5 is
The amount of deflection is greater than the deflection 10 of the seal plate 4, and the seal plate 4 is deflected toward the inside of the cylindrical underground structure 1. Then, the mounting part 17 of the cover plate 16 is overlapped with the holding plate 6 on one side, and the mounting part 17 is biased toward the inside of the cylindrical underground structure 1 to the opposite side of the mounting part 17 (joint gap 2 side). ) covers the flexible portion 12 of the second seal plate 5 from the inside of the cylindrical underground structure 1.

One side of both the seal plates 4 and 5 and the retainer plate 6 stacked thereon are attached to one of the cylindrical underground structures 1 by applying a nut 13 to one of the anchor bolts 7 passing through these members. The mounting portions 17 of the fixed seal plates 4, 5 and the retaining plate 6 and cover plate 16 stacked thereon are similarly secured by applying nuts 13 to the anchor bolts 7 passing through them. It is fixed to the cylindrical underground structure 1.

Further, a swellable rubber 14 is interposed between the first seal plate 4 and the notch step 8 so as to be located closer to the joint gap 2 than the anchor bolt 7. This swellable rubber 14 absorbs moisture and expands in volume. Moreover, a joint material 15 is interposed in the joint gap 2.

In the above-mentioned joint 3, when there is no misalignment between the underground structures 1, 1, the joint material 15 bears the earth pressure and groundwater pressure, but when the sealing function of the joint material 15 weakens due to aging etc. Earth and sand may enter the joint gap 2. In such a case, the first seal plate 4 prevents dirt and the like from entering the inside of the underground structure 1. Therefore, the second seal plate 5 is not affected by earth and sand, underground water, etc., and is not damaged or aged by these earth and sand, and maintains its original state when installed. Further, the cover plate 16 protects the flexible portion 12 of the second seal plate 5 from the inside of the cylindrical underground structures 1, 1 with its cover portion 18. In other words, the flexible portion 12 is protected by the cover portion 18 from being accidentally damaged by the operator when working on piping, wiring, etc. inside the cylindrical underground structures 1, 1. The cover portion 18 also prevents the irregular shape of the portion 12 from being exposed inside the cylindrical underground structures 1, 1 and spoiling the aesthetic appearance. Also,
The swellable rubber 14 attempts to expand in volume by absorbing moisture such as ground water, but the first seal plate 4 is pressed against the notch step 8 by the tightening force of the anchor bolt 7. The swelling rubber 14 adheres to the first seal plate 4 and the cutout step 8 under high pressure (compression adhesion) due to the expansion force caused by absorption of water, thereby preventing underground water etc. from entering the anchor bolt 7 side. This also prevents corrosion of the anchor bolt 7. Of course, if the first and second seal plates 4 and 5 alone can provide a sufficient water-stopping mechanism, the swellable rubber is not necessarily required.

If the two underground structures 1, 1 shift at the joint as shown in FIG. 3 due to uneven subsidence of the ground, an earthquake, etc., the first seal plate 4 will break. On the other hand, the second seal plate 5 has a flexible portion 12 protected by the first seal plate 4 and the cover plate 16, and maintains a state close to the state at the time of installation, but this flexible portion 12 has a length margin. Therefore, displacement of the underground structures 1, 1 is allowed and breakage can be avoided. The second seal plate 5 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.

Embodiment 2 This embodiment is shown in FIG. 4, in which components that are substantially the same as those in the first embodiment are given the same reference numerals as in the first embodiment.

In this example, the difference from Example 1 lies in the shape of the second seal plate 21, in which the second seal plate 21 has two bending parts 23, 2 bent inward of the underground structure 1.
It has 3. The cover plate 22 has its one side mounting portion 24 supported by the anchor bolt 7, and the cover portion 25 on the opposite side is biased inward and attached to the second side.
The flexible portions 23, 23 of the seal plate 21 are covered from the inside.

In the case of this example, the cover plate 22 prevents the two flexible parts 23, 23 of the second seal plate 21 from hanging together, and also improves the appearance by covering the second seal plate 21. Contribute.

In addition, although the reinforcing cloth is embedded in each seal plate in the above embodiment, there is a case where the reinforcing fabric is not embedded.

In addition, the shape and amount of deflection of the flexible portion of the second seal plate can be changed and set 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.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing a partial cross section of the underground structure;
FIG. 2 is a longitudinal cross-sectional view showing the joint of Example 1, FIG. 3 is a cross-sectional view showing the state of the joint in the case of an abnormality in the same example, and FIG. 4 is a longitudinal cross-sectional view of the joint of Example 2. 1... Underground structure, 2... Joint gap, 3,20
... Joint, 4 ... First seal plate, 5, 21 ... Second seal plate, 6 ... Holding plate, 7 ... Anchor bolt, 12, 23 ... Flexible part, 16, 22 ... Cover plate, 17, 24...Mounting part, 18, 25
...Cover part.

Claims (1)

[Claims] 1. At the joint of the cylindrical underground structures facing each other with a gap, a first seal plate and a second seal plate, which are separate from each other, are installed on the inner peripheral surfaces of both cylindrical underground structures, respectively. Both side parts of both seal plates are overlapped and abutted so that the first seal plate is located on the side of the cylindrical underground structure across the gap, and the above-mentioned both side parts of the two seal plates are respectively in contact with the second seal plate. It is fixed to both cylindrical underground structures with bolts via a retaining plate that abuts from the circumferential side, and a cover plate mounting part is attached to one of the retaining plates.
The second seal plate is provided with a flexible portion in which the length of the central portion that is not pressed by both of the pressing plates is longer than the central portion of the first seal plate, and is bent inward of the cylindrical underground structure, and A joint for a cylindrical underground structure, wherein the plate includes a cover portion that covers the flexible portion from inside the cylindrical underground structure.