JPH073770A - Method for connecting nonconcentric multiple-pipe - Google Patents

Abstract

PURPOSE:To provide a method of connection capable of effecting screw connection and easy in handling by fitting inner pipes into the fitting hole of a spacer, and sandwiching the spacer between joint pipes while coupling an upstream joint pipe to a downstream joint pipe by means of screws. CONSTITUTION:Projecting inner pipes 7, 8 are fitted into the fitting hole of the diameter- increased portion 17 of a spacer 16 and the lower end of the diameter-increased portion 17 is made to abut to the upper end face 10 of an outer pipe 4. When an upper joint pipe 1 is suspended above a lower joint pipe 2 so as to be connected to the lower joint pipe 2, inner pipes 5, 6 in the joint pipe 1 are lowered to a position where they project from the lower end face 12 of an outer pipe 3, and the inner pipes 5, 6 are fitted into a fitting hole on the side of a diameter-reduced portion 18 and the outer pipe 3 is brought close to the outer pipe 4. Next, the diameter-increased portion 17 and the diameter-reduced portion 18 are fitted into the inner hole 14 and the small inner hole 15 of the outer pipe 3, respectively, and the outer pipe 3 is rotated to engage the inside screw 13 of the outer pipe 3 with the outside screw 11 of the outer pipe 4, and the outer pipe 3 is turned until the diameter-increased portion 17 is sandwiched between the stepped-level 19 of the outer pipe 3 and the upper end face 10. Then the spacer 16 is held between the outer pipes 3, 4 and the inner pipes 5, 6 are communicated with the respective inner pipes 7, 9 via respective communicating holes 20, 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention connects connecting pipes in which an inner pipe is housed in an outer pipe for the purpose of injecting a plurality of types of chemical liquids for ground improvement into the ground and for forming an electric circuit. The present invention relates to a connection method, and more particularly, to a connection method for a non-concentric multi-connection pipe in which inner pipes arranged non-concentrically are screwed together while connecting the inner pipes.

[0002]

2. Description of the Related Art A chemical solution is injected into the ground for the purpose of impermeable to the ground and strengthening the ground. The chemical liquid to be injected is mainly a two-liquid mixed type mainly composed of water glass, and there are inorganic type, organic type or suspension type, solution type, etc. as a reaction agent, depending on the purpose of injection or the target ground. It is used by selecting the strength after consolidation, the permeability to the ground, the time until consolidation (gel time), etc. In particular, in the chemical injection method called the compound injection method, a chemical solution with a short solidification time, which is called a flash setting type, is initially injected to limit the injection range, and then an osmotic injection with a long solidification time is performed. Reactant is used. As a method of injecting this chemical solution, it is supplied from an infusion pump on the ground through a hose and a water swivel to an injection pipe constituted by a double pipe or a multiple pipe and a tip injection device called a monitor. That is, using a monitor with a bit (drilling edge) attached to the tip, a boring rod (drilling rod) having a double pipe or multiple pipe structure, etc., after performing rotary drilling to a predetermined depth, The chemical solution is injected into the ground at a predetermined depth (step) at a predetermined amount, and this operation is repeated as designed. When a measurement sensor for determining the effect of injecting a chemical solution is installed at the bottom of the hole, or when an instrument driven at the bottom of the hole is used, it is used as a part of an electric circuit such as a signal line or a power line. An inner pipe is applied, and a waterproof connector or the like can be used to connect the pipes.

FIG. 5 is a cross-sectional view of a commonly used triple-tube type chemical liquid injection tube. In the outer tube 27, a concentric tube 28 and a central tube 29 are concentrically arranged with a proper gap. The liquid medicine is fed into the central tube 29 (indicated by A) and the concentric tube 2
8 and the central tube 29 (indicated by B) and the outer tube 27 and the concentric tube 28 (indicated by C).

[0004] As a publication relating to the injection of chemicals, there is the "New Illustrated Grout Handbook", which was first issued on July 4, 1972 (published by Lateis Co., Ltd., 15-
9, 03-3267-2561). The double-tube structure for injecting the drug solution is also described in various places in this book.

On the other hand, there are many publications concerning the chemical liquid injector, for example, there is one disclosed in Japanese Patent Publication No. 60-2450. The structure of the injection tube is also disclosed in the drawings in the publication.

[0006]

As described above, in the conventional chemical liquid injection pipe shown in FIG. 5, the outer pipe 27, the concentric pipe 28 and the central pipe 29 are concentrically arranged. As described above, it is convenient to use a screw connection to connect the connecting pipes. For that purpose, the inner pipe such as the concentric pipe 28 or the central pipe 29 is connected to the outer pipe 2.
It is necessary to be placed concentrically with 7. On the other hand, in the prior art, there was a connecting pipe in which the inner pipe was arranged non-concentrically,
In that case, the connecting pipes were connected by a flange joint or the like which does not require rotational coupling. However, since the flange joint has an uneven appearance and it is difficult to take measures against collapse of the hole wall, and it takes time to tighten the bolts on the flange, it has not been used much for drilling small holes such as boring. . In that respect, the one in which the connecting pipe provided with the concentric inner pipe is screwed is easy to handle, but the flow passage area becomes smaller as the number of chemicals to be injected increases,
In addition, a structure in which a large number of inner tubes are arranged concentrically has a problem that the supporting structure is complicated and the cost is high.

The present invention is intended to solve the above problems and allows a relatively large flow passage area of an inner tube for passing various kinds of chemicals and the like, and enables screw connection to facilitate handling. It is also an object of the present invention to provide a method for connecting a non-concentric multiple pipe that can be implemented at low cost.

[0008]

In order to achieve the above-mentioned object, the present invention connects connecting pipes having an outer pipe and a plurality of inner pipes which are non-concentrically arranged inside thereof. A connection method, wherein the inner pipe is fitted in a fitting hole of a spacer, and the spacer is sandwiched between the two connecting pipes while the upper connecting pipe and the lower connecting pipe are screwed together. It is characterized by the connection method of. Furthermore, the spacer is fixed to the connecting pipe on the side where it is not screwed, and the spacer is prevented from rotating due to the frictional force generated between the upper connecting pipe and the spacer when screwing, so a quick and reliable connection can be achieved. It is characterized by a method of connecting non-concentric multi-connection pipes.

[0009]

[Operation] The inner pipes of the upper and lower connecting pipes are connected to each other through the spacer. In this state, the upper connecting pipe and the lower connecting pipe are screwed together. Since the spacer is provided in both connecting pipes, the spacer is sandwiched between the connecting pipes and solidified by screw connection. As described above, the inner pipes on the upper side and the lower side are communicated with each other, and both the communication pipes are connected by screw connection. Further, by fixing the spacer to the connecting pipe on the side where the screw is not screwed, the rotation of the spacer at the time of screwing is prevented, and quick and reliable connection is possible.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 is an axial sectional view showing a connection state of the present embodiment, FIG. 2 is a lateral sectional view taken along the line DD of FIG. 1, FIG. 3 is an axial sectional view of another embodiment of the present invention, and FIG. 4 is this embodiment. FIG. 3 is a schematic axial cross-sectional view showing the injection of the chemical liquid by.

As shown in FIGS. 1 and 2, in this embodiment, an upper connecting pipe 1 (upstream side connecting pipe) and a lower connecting pipe 2 (downstream side connecting pipe).
The case of connecting and is shown. The upper and lower connecting pipes 1 and 2 are an upper outer pipe 3 and a lower outer pipe 4 (hereinafter, referred to as outer pipes 3 and 4) having the same outer diameter, and a first loosely inserted inside them.
From the upper inner pipe 5, the second upper inner pipe 6 (hereinafter, referred to as inner pipes 5, 6) and the first lower inner pipe 7, the second lower inner pipe 8 (hereinafter, inner pipes 7, 8) Composed. The inner tubes 5, 6 and 7, 8 are loosely inserted into the outer tubes 3 and 4 as described above, but are held by the holders 9 and are restrained from freely moving in the outer tubes 3 and 4. It is arranged almost at a fixed position. Further, the outer screw 11 is threaded downward from the upper end surface 10 of the outer tube 4 by an appropriate length. On the other hand, the outer tube 3 has an inner thread 13 threadedly engaged with the outer thread 11 from the lower end surface 12 of the outer tube 3 and an enlarged diameter portion 17 of a spacer 16 described later.
Is formed, and a small inner hole 15 into which the reduced diameter portion 18 of the spacer is fitted is formed, and a step 19 is formed between the inner hole 14 and the small inner hole 15. To be done.

As shown in FIG. 1, the spacer 16 has a two-stage cylindrical shape having an enlarged diameter portion 17 and a reduced diameter portion 18,
Fitting holes into which the inner pipes 5 and 6 are fitted are formed in the reduced diameter portion 18 on the upper side thereof, and fitting holes into which the inner pipes 7 and 8 are fitted are formed into the enlarged diameter portion 17 below. It The upper and lower fitting holes are communicated with each other by communication holes 20 and 21 having substantially the same inner diameters as the inner pipe 5 (7) and the inner pipe 6 (8). Also, the expanded portion 1
The width of the outer tube 1 in the axial direction of 7 is such that the enlarged diameter portion 17 is supported by being sandwiched between the upper end surface 10 and the step 19.
Are dimensioned so as not to interfere with the threaded end of the outer screw 11 of the outer tube 4.

Next, a method of connecting the upper connecting pipe 1 and the lower connecting pipe 2 will be described. First, when the upper connecting pipe 1 is not connected, the inner pipes 7 and 8 of the lower connecting pipe 2 are held in a state of protruding from the upper end surface 10 of the outer pipe 4. The inner tubes 7 and 8 projecting into the fitting holes of the expanded diameter portion 17 of the spacer 16 are fitted so that the lower end of the expanded diameter portion 17 is brought into contact with the upper end surface 10 of the outer tube 4. next,
When the upper connecting pipe 1 is suspended above the lower connecting pipe 2, the inner pipes 5 and 6 in the upper connecting pipe 1 are lowered to a position where they project from the lower end surface 12 of the outer pipe 3. This is due to the structure in which the holders (not shown) for the inner tubes 5, 6 abut on the step (not shown) formed in the outer tube 3. The protruding inner tubes 5 and 6 are fitted into the fitting holes on the side of the reduced diameter portion 18 of the spacer 16 to bring the outer tube 3 closer to the outer tube 4 side. The expanded diameter portion 17 and the reduced diameter portion 18 of the spacer 16 are inserted into the inner hole 14 and the small inner hole 15 of the outer pipe 3, and by turning the outer pipe 3, the inner screw 13 of the outer pipe 3 becomes the outer screw of the outer pipe 4. Screw to 11. Also, the enlarged diameter portion 17 of the spacer 16
As described above, the step 19 of the outer tube 3 and the upper end surface 1 of the outer tube 4
The outer tube 3 is screwed until it is clamped between zero. As described above, the upper communicating pipe 1 and the lower communicating pipe 2 are connected via the spacer 16, and the inner pipes 5, 6 of the upper communicating pipe 1 and the inner communicating pipe of the lower communicating pipe 2 are connected via the communicating holes 20, 21 of the spacer 16. The pipes 7 and 8 communicate with each other. Hereinafter, by repeating the same connection method, a connection pipe having a desired length can be formed.

As shown in FIG. 2, the connecting pipe 1 of this embodiment.
In the case of (2), since the inner tubes 5 (7) and 6 (8) are housed in the inner space of the outer tube 3 (4), a large number of inner tubes are required for injecting the chemical liquid. It is possible to dispose while ensuring a sufficient flow passage area. Further, it is easy to hold the respective inner tubes 5, 6 and the like, and it can be carried out easily and at low cost.

FIG. 4 shows an outline of a state in which the connection connecting pipe 100 of this embodiment is arranged in the ground 22. The connection connecting pipe 100 is inserted while being connected to the drilled hole in the ground 22. The chemical liquid is piped into the inner pipes 5 (7) and 6 (8).
By injecting from 3 and 24, the chemical solution is jetted and supplied into the ground 22 as indicated by the arrow.

FIG. 3 shows another embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 1 indicate the same things or those having the same functions, and the explanation thereof will be omitted. A locking portion 25 is formed on the upper pipe 10 side of the outer pipe 4 of the lower connecting pipe 2. On the other hand, a locking portion 26 that engages with the locking portion 25 is formed on the lower end side of the enlarged diameter portion 17 of the spacer 16 in the figure. The spacer 16 is fixed to the outer tube 4 side by the engagement of the locking portions 25 and 26. Therefore, the rotation of the spacer 16 is restrained when the upper connecting pipe 1 is screwed onto the lower connecting pipe 2 while being screwed. Therefore, the screwing operation of the upper connecting pipe 1 can be performed easily and quickly, the inner pipes 5, 6, 7, 8 and the like are not twisted, and the upper and lower connecting pipes 1 and 2 can be connected. Definitely done.

In the above description, the two inner tubes 5
The case of using (7) and 6 (8) has been described, but the present invention is not limited to this. In addition, the inner pipe 5 (7),
The shape of 6 (8) is not limited to that shown in the drawing.
Further, the inner tubes 5 (7) and 6 (8) are not limited to those for injecting a chemical solution,
As described above, an electric circuit diagram may be used. Further, the shapes of the locking portions 25 and 26 may be such that the rotation is restrained when they are engaged with each other, for example, a clutch pawl type, and other fitting mechanisms are also applicable.

[0018]

According to the present invention, the following remarkable effects are obtained. 1) Since the inner pipe arranged non-concentrically has a structure in which the outer pipe is screw-connected while being connected and held through a spacer,
Connection of the connecting pipe is performed quickly and reliably. 2) It is extremely easy to handle because the connecting pipe is connected by screwdriver. 3) By adopting a structure in which the spacer is fixed to the fixed outer tube, the screw connection work can be performed more easily, quickly, and reliably. Moreover, twisting of the inner pipe or the like does not occur at the time of connection. 4) Since the inner pipes are arranged non-concentrically in the outer pipes, even if a large number of inner pipes are arranged, it is possible to secure a sufficient flow passage area through which the chemical solution passes. 5) Even if a large number of inner pipes are provided, it is sufficient to provide spacers that match the number of inner pipes, and connection work of connecting pipes can be easily performed regardless of the number of inner pipes. 6) The manufacturing cost can be reduced as compared with the conventional flange joint.

[Brief description of drawings]

FIG. 1 is an axial sectional view of an embodiment of the present invention.

2 is a cross-sectional view taken along the line DD of FIG.

FIG. 3 is an axial sectional view of another embodiment of the present invention.

FIG. 4 is a schematic axial sectional view showing a state in which the present embodiment is applied to the ground.

FIG. 5 is a cross-sectional view showing an inner pipe structure of a conventional concentric type connecting pipe.

[Explanation of symbols]

 1 Upper connecting pipe 2 Lower connecting pipe 3 Upper outer pipe (outer pipe) 4 Lower outer pipe (outer pipe) 5 First upper inner pipe (inner pipe) 6 Second upper inner pipe (inner pipe) 7 First Lower inner pipe (inner pipe) 8 Second lower inner pipe (inner pipe) 9 Holding device 10 Upper end face 11 Outer screw 12 Lower end face 13 Inner screw 14 Inner hole 15 Small inner hole 16 Spacer 17 Expanded diameter part 18 Reduced diameter part 19 step 20 communication hole 21 communication hole 22 ground 23 pipe 24 pipe 25 locking part 26 locking part 100 connection connecting pipe

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Naoki Yamamoto 8-14-14 Ginza, Chuo-ku, Tokyo Nichitsuku Construction Co., Ltd. (72) Inventor Takao Yokohata 1-2-2 Uchisaiwaicho, Chiyoda-ku, Tokyo Toho Chikoshi Machinery Co., Ltd.

Claims (2)

[Claims] 1. A connecting method for connecting connecting pipes having an outer pipe and a plurality of inner pipes arranged non-concentrically inside the outer pipe, wherein the inner pipe is fitted in a fitting hole of a spacer. With
A method of connecting a non-concentric multi-connection pipe, characterized in that the spacer is sandwiched between both the connection pipes while screwing the upstream-side connection pipe and the downstream-side connection pipe. 2. The method for connecting a non-concentric multi-connection pipe according to claim 1, wherein the spacer is fixed to the outer pipe of the non-screwed side connection pipe.