JP2993628B2 - Flat packing for perforated pipe and perforated pipe fitted with this flat packing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat packing interposed between opposed surfaces of front and rear perforated pipes when a perforated pipe is buried in the ground by a propulsion method, and to a perforated pipe having the flat packing mounted thereon.

[0002]

2. Description of the Related Art When laying an underground pipe such as an electric cable laying pipe, gas, or a water pipe by the propulsion method, first, a shield machine is dug from a starting shaft, and temporary pipes are sequentially added to the shield machine. The burial is buried up to the arrival shaft, and then the temporary pipe and the buried pipe are replaced. In order to measure the direction of propulsion and to remove excavated earth and sand when propelling and embedding the temporary pipe, a conventional temporary pipe A has a hole for surveying in the temporary pipe A as shown in FIGS. B and a pipe for sending and discharging mud C are provided.
Are open at the front and rear end faces of the temporary tube A.

Therefore, when connecting such temporary pipes, it is necessary to make the open ends communicate with each other in a water-stop state. For this reason, conventionally, the hole B in the end face of the temporary pipe A and the open end of the pipe C are conventionally used. A circumferential groove D is engraved in the peripheral portion, and an O-ring E is fitted into the circumferential groove D. When the pipes are fastened and joined by bolts, the O-ring projecting from the circumferential groove D is connected to the other side. Water is stopped by closely contacting the opposite surface of the pipe.

[0004]

However, according to such a conventional water-blocking structure using an O-ring, circumferential grooves D into which the O-ring E is fitted must be formed on both end surfaces of the temporary pipe. In addition, the formation of the circumferential groove D requires a great deal of labor and cost, and the O-ring E is likely to fall off from the circumferential groove, which may hinder the work at the time of connecting the temporary pipe. An object of the present invention is to provide a flat packing capable of completely solving such a problem and a porous tube provided with the flat packing.

[0005]

In order to achieve the above-mentioned object, a flat packing according to the present invention is provided with pipes such as a feed and discharge pipe in a pipe body and connecting the front and rear open ends of these pipes with pipes. A packing attached to the end face plate of the perforated pipe opened from the front and rear end face plates of the main body, wherein a plurality of communication are provided in such a manner that a disc-shaped packing having a certain thickness is mainly communicated with an open end of a conduit in the perforated pipe. A hole is formed, and a ring-shaped elastic ridge that surrounds the open end of the communication hole is protruded on one of the front and rear surfaces.

According to a second aspect of the present invention, there is provided a perforated pipe in which pipes such as a feed pipe and a sludge pipe are arranged in a pipe main body, and front and rear open ends of these pipes are opened from front and rear end face plates of the pipe main body. And a ring-shaped flange portion having a projection length substantially equal to the thickness of the flat packing is projected from an outer peripheral edge of one of the exposed surfaces of the front and rear end plates to expose the end plate surrounded by the ring-shaped flange portion. It has a structure in which the flat packing is attached to the surface.

[0007]

The flat packing is brought into close contact with the end face plate of the pipe body protruding the ring-shaped flange portion with the ring-shaped elastic ridge surrounding the opening end of each communication hole on the outer surface side. They communicate with the open ends of the pipes facing each other in a superposed state.
On the other hand, a ring-shaped flange portion having a projection length substantially equal to the thickness of the flat packing is protruded from the outer peripheral edge of the end plate serving as the flat packing mounting surface of the pipe main body, so that the space surrounded by the flange portion is provided. By attaching the flat packing to the flat packing, the flat packing can be easily and accurately attached.

In this way, the perforated pipe having the flat packing attached to the end face plate of the pipe main body is sequentially joined back and forth via the flat packing, connected by bolts, and then propelled into the ground. The ring-shaped elastic ridge protruding around the communication hole is pressed around the open end of the pipe channel of the opposing perforated pipe to perform reliable water stoppage, and the protruding end face of the outer peripheral flange portion of one perforated pipe is The driving force is transmitted by contacting the outer peripheral end surface of the other perforated tube.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
FIG. 1 is a front view of a flat packing, and FIG. 2 is a cross-sectional view. The packing main body 1 is made of a disc-shaped rubber plate having a constant thickness. A central communication hole 2 that can communicate with the central survey hole 12 of the pipe main body 11 penetrates between the front and rear surfaces, and is formed. The communication holes 3 to 6 corresponding to the mud pipes 13 and 14, the lubrication supply pipe 15, and the air vent pipe 16 penetrate and are formed.

As shown in FIGS. 3 and 4, the perforated pipe is a pipe main body.
Disc-shaped front and rear end plates 21, 22 are integrally fixed to 11,
The feed / discharge mud line which penetrates and forms the survey hole 12 in the center of the front and rear end plates 21 and 22 and is juxtaposed in the pipe body 11 on both sides of the front and rear end plates 21 and 22 The front and rear open ends of 13 and 14 are communicated with the outside, and the upper and lower front and rear end plates 21 and 22 are provided with pipes such as a lubrication supply pipe and an air release pipe disposed in the pipe body 11. The open ends of the passages 15, 16 are also open to the outside. Further, bolt fastening holes 17 are provided at several locations on the outer peripheral portion of the front and rear end face plates 21 and 22. In addition, 18
Reference numeral denotes a groove for storing a hydraulic supply hose or wiring, which is recessed over the entire length of the upper peripheral portion of the pipe body 11.

Further, one of the front and rear end plates 21 and 22 of the pipe body 11 (the front end plate 21 in the figure) is formed on the flat packing mounting surface, and the end plate 21 is provided.
A ring-shaped flange portion 19 having a fixed length is protruded from the outer peripheral edge of the tube body 11 in the extending direction of the tube body 11. Then, the outer diameter of the packing main body 1 is formed to be substantially equal to or slightly smaller than the inner diameter of the flange portion 19, the packing main body 1 is fitted to the flange portion 19, and the rear surface is surrounded by the flange portion 19. Face plate 21
Is attached to the plate surface by bonding or welding. Also, the thickness of the packing main body 1 is
Are formed substantially equal to the protruding length.

A ring-shaped protruding portion 20 having the same protruding length as that of the flange portion 19 is also provided on the outer peripheral edge of the opening end of the central survey hole 12 of the end face plate 21, and its outer diameter is determined by the packing body 1. Is formed equal to the inner diameter of the central communication hole 2. The end plate 21 having such a structure is easily processed by a mold,
Can be formed.

A notch 23 of the same size and shape communicating with the storage groove 18 of the tube body 11 is formed in the upper periphery of the end face plate 21 by cutting. Is the flange
A projecting edge 24 having the same projecting height as 19 is protruded, while a recess 7 having the same shape that fits tightly on the outer peripheral wall surface of the projecting edge 24 is formed in the upper peripheral portion of the packing main body 1. Notch recesses 8 for bolt insertion are formed at a plurality of locations on the outer periphery corresponding to the bolt fastening holes 17 formed on the outer peripheral portion of the end face plate 21 and provided.

Further, in the packing main body 1, the end face plate is provided.
Ring-shaped elastic ridges 9 and 10 protrude from the outer peripheral edge of the opening end of each of the communication holes 2 to 6 on the surface (front surface) opposite to the mounting surface (rear surface in the figure) with respect to 21. The pipe body 11
The diameters of the communication holes 3 to 6 of the packing main body 1 communicating with the respective pipelines 13 to 16 are formed to be equal to the opening diameters of the corresponding pipelines 13 to 16, respectively.

The flat packing constructed as described above is mounted on an end plate of the perforated pipe to be propelled and buried underground by a propulsion method. In this case, it is configured to be mounted on the front end plate 21 of the pipe main body 11, but is mounted on the rear end plate 22.
Alternatively, a ring-shaped flange portion 19 may be formed and attached to the end face plate 22. In short, it may be attached to any one of the end face plates.

The mounting method is such that the ring-shaped elastic ridges 9 and 10 protruding from the opening ends of the communication holes 2 to 6 project forward from the end face plate 21 of the pipe body 11. The packing main body 1 is placed inside the flange portion 19 such that the outer peripheral end face of the packing main body 1 and the central communication hole 2 are respectively along the ring-shaped flange portion 19 of the pipe main body 11 and the outer peripheral protruding edge portion 20 of the central survey hole 12. Each of the communication holes 3 to 6 formed in the outer peripheral portion of the packing main body 1 is fitted to the space portion so as to communicate with the corresponding opening end of the corresponding one of the conduits 13 to 16 of the pipe main body 11, and the back surface thereof is End plate 21
It is carried out by sticking and fixing to.

Then, as shown in FIG. 6, the shield machine 32 is started from the start shaft 31 toward the arrival shaft (not shown). It is pushed forward by the propulsion device 33 installed in the start shaft 31 while being successively added via the flat packing, and propelled and buried underground. At this time, the front end face plate of the perforated pipe to be buried next is placed on the rear end face plate 22 of the perforated pipe pushed into the ground.
21 are joined via flat packing, and the front and rear end face
Insert the bolt 34 between the bolt connection holes 17 and 17 of 21 and 22,
The nut 35 is connected by screwing.

As described above, the perforated pipes are connected to each other and are sequentially propelled and buried in the ground toward the reaching shaft, but when the subsequent perforated pipes are pushed forward, each of the communication holes 2 of the packing main body 1 is pushed. The ring-shaped elastic ridges 9 and 10 projecting around 6 to 6 are firmly pressed around the open ends of the conduits 12 to 16 opened on the rear end face plate 22 of the opposing perforated pipe to ensure reliability. The outer flange portion 19 of the end plate 21 of the rear perforated pipe on which the waterproof main body is mounted and the packing main body 1 is attached is the end plate of the front perforated pipe.
The propulsion force is transmitted by abutting on the outer peripheral surface of 22.

In this way, the earth and sand excavated by the shield machine 32 are propelled while being discharged to the starting shaft 31 through the sending and discharging mud pipes 13 and 14 in the serially communicating porous tube, and when the perforated tube row reaches the reaching shaft, Next, buried pipes such as gas pipes and water pipes are sequentially propelled and buried while being added sequentially from the starting shaft 31 side, and replaced with the previously buried porous pipe as a temporary pipe.

[0020]

As described above, according to the flat packing for a perforated pipe of the present invention, pipes such as feeding and discharging pipes are arranged in the pipe main body, and the front and rear open ends of these pipes are connected to the front and rear end face plates of the pipe main body. A packing attached to the end face plate of the perforated tube opened from the side, wherein a plurality of communication holes communicating with the open end of the conduit in the perforated tube are formed in a disc-shaped packing mainly having a constant thickness. The flat packing is attached to the end plate of the pipe body because a ring-shaped elastic ridge surrounding the open end of the communication hole is projected from one of the front and rear surfaces. The plurality of communication holes can be accurately communicated with the open ends of the plurality of conduits that are open to the end face plate of the pipe body, and the ring-shaped elastic ridges protruding from each communication hole are provided. Peripheral edge of the open end of the pipe opening on the opposite end plate surface of the pipe body to be joined back and forth In which it can achieve a reliable waterproofing effect elastically by crimping.

Further, in the perforated pipe equipped with the flat packing, pipes such as a feeding and discharging mud pipe are arranged in the pipe main body, and front and rear open ends of these pipes are opened from front and rear end face plates of the pipe main body. And a ring-shaped flange portion having a projection length substantially equal to the thickness of the flat packing is projected from an outer peripheral edge of one of the exposed surfaces of the front and rear end plates to expose the end plate surrounded by the ring-shaped flange portion. Since the flat packing is attached to the surface, there is no need to provide a peripheral groove for fitting an O-ring at the peripheral edge of each conduit opened in the end face plate as in the related art,
The end face plate has a structure in which a ring-shaped flange is protruded from the outer peripheral edge, so that it can be easily processed with a mold or the like, and the open ends of all pipelines can be easily fitted simply by fitting the flat packing into the ring-shaped flange and attaching it. The communication holes of the flat packing can be communicated at one time, so that the flat packing can be easily attached, there is no danger of falling off, and further, the propulsion force is applied to the pipes through the ring-shaped flange. It can be transmitted smoothly and reliably.

[Brief description of the drawings]

FIG. 1 is a front view of a flat packing,

FIG. 2 is a longitudinal sectional side view along the line XX,

FIG. 3 is a front view of a perforated tube,

FIG. 4 is a simplified longitudinal side view thereof,

FIG. 5 is a longitudinal sectional side view of a pipe connection portion;

FIG. 6 is a simplified vertical cross-sectional side view of a state in which the propulsion is embedded.

FIG. 7 is a front view showing a conventional example.

FIG. 8 is a simplified vertical side view of the tubular body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Packing main body 2-6 Communication hole 9, 10 Ring-shaped ridge 11 Pipe main body 12 Survey hole 13-16 Pipe line 19 Ring-shaped flange 21, 22 Front and rear end plates

Claims (2)

(57) [Claims] 1. A pipe such as a feeding and discharging mud pipe is provided in a pipe main body, and the front and rear open ends of these pipes are attached to the end face plate of a perforated pipe formed from the front and rear end face plates of the pipe main body. A plurality of communication holes for communicating with the opening end of the conduit in the perforated pipe are formed in a disc-shaped packing body having a constant thickness, and the packing is formed on one of the front and rear surfaces. A flat packing for a perforated pipe, characterized by projecting a ring-shaped elastic ridge surrounding an opening end of a communication hole. 2. A pipe line corresponding to a feed / discharge mud pipe is provided in a pipe body, and front and rear open ends of these pipe lines are opened from front and rear end face plates of the pipe body. A ring-shaped flange is protruded from the outer peripheral edge of the exposed surface of the pipe , and the above-mentioned conduit is opened on the exposed surface of the end plate surrounded by the ring-shaped flange.
It has a communication hole communicating with the mouth end, and the open end of the communication hole is
A perforated pipe having flat packing formed by projecting a surrounding ring-shaped elastic ridge portion .