JPS594591B2 - Waterproof structure for pipe penetrations in underground structures - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a waterproof structure for a pipe penetration part of an underground structure such as a manhole through which a gas pipe, water pipe, etc. pass.

In general, manholes through which pipe bodies such as gas pipes and water pipes penetrate must be watertight and waterproof to prevent rainwater from entering the inside from the pipe body penetration part, but conventionally known waterproof structures have It is impossible to reliably prevent rainwater from entering the manhole, and therefore, there is a problem in that the water accumulated in the manhole must be pumped out from time to time using a pump or the like.

In order to prevent such problems, pipe penetrations in manholes, etc. must have a waterproof structure, but conventionally, as described in ``Japanese Patent Publication No. 49-26531,'' An elastic sealing material is interposed between the inner circumferential surface of the hole and the outer circumferential surface of the tube, and this elastic sealing material is compressed and deformed from both sides by pressing plates, thereby sealing the inner circumferential surface of the tube through-hole and the outer circumference of the tube. It was designed to be placed in close contact with the surface.

However, in such a conventional structure, the load of the tube is supported only by the elastic sealing material, which tends to cause the elastic sealing material to buckle, and because only the elastic sealing material is subjected to water pressure, leakage and other problems occur. is likely to occur.

In addition, since the outer peripheral surface of the elastic sealing material must be in close contact with the inner surface of the tube through-hole, a smooth inner surface member is required on the inner surface of the tube through-hole, and there is a gap between this inner surface member and the underground structure. There was also a problem with water leaking easily.

The present invention was made based on the above circumstances, and its purpose is to increase the durability of the O-ring by preventing the load of the pipe body and water pressure from being directly applied to the O-ring, and to improve the durability of the O-ring during waterproofing work. To provide a waterproof structure for a pipe body penetrating part of an underground structure, which can easily and more reliably prevent rainwater or the like from penetrating into the underground structure through the pipe body penetrating part by preventing water leakage.

That is, in the present invention, cement is filled between the outer surface of a pipe through-hole formed in the wall of an underground structure and the outer surface of the pipe inserted into the through-hole, and the cement is used to prevent the pipe from forming. In order to support the load as well as water pressure, a split sheath pipe having a larger diameter than the pipe body is attached to the pipe body through an adhesive in the recess formed on the inner surface side of the through hole. An elastically deformable O-ring and a pair of clamping plates that clamp from both sides of the O'J song are inserted between the split sheath tube and the tube body, and are fixed concentrically to the inner surface of the through-hole. By tightening the bolts in the direction in which the clamping plates approach each other, the O-ring is deformed and brought into close contact with the outer and inner circumferential surfaces of the O-ring and the above-mentioned split sheath tube and tube body, thereby maintaining liquid tightness. Since the members that come into contact are the split sheath tube and the tube body, the surfaces are smooth and have good sealing properties, and the split sheath tube is fixed to the inner surface of the through hole with adhesive, making it easy to install the split sheath tube. In addition, since the cement supports the load and water pressure of the pipe body, it prevents the O-ring from weakening, and in addition, a foam impregnated with a water-reactive resin is attached to the end face of the cement that faces the adhesive. Then, during the curing of the adhesive and the tightening of the O-ring, the foam is used to waterproof the water that seeps out of the cement during the work, thereby ensuring reliable waterproofing. .

The present invention will be explained below based on an embodiment shown in the drawings.

In the figure, 1 is an underground structure such as a manhole, and 2
is the wall.

For example, a circular pipe through hole 3 is bored in the wall 2, and a pipe 4 such as a gas pipe or a water pipe concentrically passes through this through hole 3.

The outer surface of the underground structure 1 in the through hole 3 is filled with cement, for example, quick setting cement 5, and by this filling, the tube body 4 can be positioned completely, and the underground structure in the through hole 3 can be completely positioned. A recess 6 is formed on the inner surface of the object 1.

In this recess 6, a split sheath pipe γ having a larger diameter than the pipe body 4 is fitted concentrically with respect to the pipe body 4, and this split sheath pipe 1 has its seven rank parts 7a, 7a shown in the figure It is joined with bolts to form a cylindrical monolithic structure.

Therefore, an open-cell foam 8 impregnated with a water-reactive resin and having a ring shape, for example, is attached to the inner end surface of the quick setting cement 5 of the recess 6 in the outer space of the split sheath pipe 7. ing.

A preferred example of this water-soluble reactive resin is a one-component paint epoxy resin containing a ketimine curing agent.

Therefore, when water or the like permeates the cement 5 and adheres to the foam 8, the epoxy resin reacts and hardens, thereby forming the foam 8 into a waterproof layer that blocks water penetration, thereby preventing underground The structure 1 is designed to prevent water from entering into the structure 1 in a watertight manner.

Furthermore, a filler impregnated with, for example, an epoxy resin adhesive, such as an open-cell foam 9, is inserted into the above-mentioned surrounding space, and when this adhesive hardens, the split sheath tube 1 is inserted into the recess 6. It is designed to be fixed integrally.

An elastically deformable O-ring 10 is fitted between the inner surface of the split sheath tube γ and the outer surface of the tube body 4.

This O-ring 10 has a pair of clamping plates 11° 12 on both sides thereof.
These pressure plates 11 and 12 are held by O
They are connected by a large number of bolts 13 passing through the ring 10.

Then, tighten the bolts 13... and press the pressure plates 11, 12.
By displacing the O-rings 10 in the direction of approaching each other, the O-ring 10 is compressed and deformed, and its inner and outer circumferential surfaces are brought into watertight contact with the outer circumferential surface of the tubular body 4 and the inner circumferential surface of the split sheath tube T, respectively. has been done.

According to one embodiment of the present invention configured as described above, by tightening the bolts 13...01)
Since the blowfish 10 is deformed and its inner and outer circumferential surfaces are in watertight contact with the outer circumferential surface of the tube body 4 and the inner circumferential surface of the split sheath tube 1, respectively, rainwater etc. that have permeated into the soil can penetrate the tube body of the underground structure 1. In other words, it can be reliably prevented from penetrating into the underground structure 1 through the surface of the pipe body 4.

Furthermore, the space between the through hole 3 and the pipe body 4 is filled with quick-setting cement 5, and this cement 5 supports the load and water pressure of the pipe body 4, so that the O-ring 10 does not become flat.
Undesired deformation of the O-ring 10 is prevented.

Before the O-ring 10 is attached, the recess 6 on the outer periphery of the split sheath tube 7 is filled with foam that hardens when water adheres to the inner end surface of the quick-setting cement 5 and can become a waterproof layer that blocks water penetration. 8 is attached, the rainwater cannot enter into the underground structure 1 from the pipe penetration part, that is, the recess 6, until the fixing of the split sheath pipe 1 and the installation of the 01J ring 10 are completed. Prevented.

Furthermore, the surface against which the outer circumferential surface of the O-ring 10 comes into contact is the split sheath tube T.
Since the 017 ring 10 is in close contact with the inner surface, the sealing performance is reliably maintained.

Moreover, since the split sheath tube T is joined to the inner surface of the through hole 3 by the filler impregnated with adhesive, the split sheath tube I can be easily fixed and centered with respect to the tube body 4.

Therefore, the tube penetration part of the underground structure 1 is doubly waterproofed by the O-ring 10 and the foam 8, and the underground structure is not only waterproofed after the installation of the tube 4 is completed, but also especially during the installation work. It is possible to prevent rainwater and the like from entering the structure 1, and the waterproofing effect is further improved.

Note that the above waterproof structure of the present invention can be easily applied to waterproofing around pipes of existing underground structures.

Further, the underground structure of the present invention is not limited to a manhole as shown in the embodiment.

As explained above, in the present invention, the outer surface side of the tube through hole formed in the wall of an underground structure is filled with seven membranes 14 to form a recess surrounding the tube through hole, and the tube is inserted into the recess. A split sheath tube with a diameter larger than the body is inserted, a foam impregnated with a water-reactive resin is attached to the end face side of the recess in the outer space of the split sheath tube, and it is bonded to the outer space. A filler impregnated with the agent is attached to fix the split-sheath tube, and an O-ring held between a pair of pressure plates is inserted into the split-sheath pipe, and the pressure plates are tightened with bolts to attach the O-ring to the pipe. It is designed to be deformed and brought into close contact with the outer circumferential surface of the body and the inner circumferential surface of the split sheath tube.

Therefore, according to this, the load of the pipe body and water pressure are supported by the cement and do not act on the O ring, so O
It is possible to prevent undesired deformation of the ring and increase the durability of the O-ring.

In addition, since the outer circumferential surface of the O-ring is in contact with the inner circumferential surface of the split sheath tube, it is reliably kept liquid-tight, and since the split sheath tube is fixed in the through hole with adhesive, it is easy to install. Centering with respect to the tube body can be easily performed.

Furthermore, before the O-ring is installed, a foam material that can harden and become a waterproof layer when water adheres to it is installed in the recess, so rainwater, etc. can leak into the underground structure during pipe installation work. It also prevents infiltration, making the work extremely easy.

Therefore, the pipe penetration part of the underground structure is doubly waterproofed by O-rings and foam, and rainwater that has permeated into the soil is prevented from penetrating through the pipe surface and into the underground structure. This provides excellent effects such as a further improvement in the waterproofing effect.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a cross-sectional view of the pipe penetration part as seen from the inside of the underground structure, and FIG.
A sectional view taken along the line -1T, and FIG. 3 is an enlarged sectional view of part 10 in FIG. 2. DESCRIPTION OF SYMBOLS 1... Underground structure, 2... Wall body, 3... Pipe body penetration hole, 4... Pipe body, 5... Cement, 6... Recessed part,
7... Split sheath pipe, 8... Foam, 9... Filler (foam 1.10...0 ring, 11, 12... Pressure plate,
13...Volt.

Claims (1)

[Claims] 1. Passing the tube through a tube through-hole formed in the wall of the underground structure, and filling the outer surface of the underground structure in the through-hole with cement, so that the underground structure in the through-hole is A recess is formed on the inner surface side to surround the tubular body penetration part, and a split sheath tube having a larger diameter than the tubular body is inserted into the recess concentrically with respect to the tube body. A foam impregnated with a water-reactive resin is attached to the end face of the cement in the recess in the outer space, and a filler is provided in which the inner surface of the foam in the outer space is impregnated with an adhesive. The split sheath pipe is fixed in the recess, and an elastically deformable O-ring and a pair of pressure plates that pinch the O-ring from both sides are inserted into the split sheath pipe, and the pressure plates are moved in a direction closer to each other. By bolting to the
A waterproof structure for a pipe penetration part of an underground structure, characterized in that the above-mentioned 01J ring held between these pressure plates is deformed and brought into close contact with the outer peripheral surface of the pipe and the inner peripheral surface of the split sheath pipe.