JPH1171987A - Flexible connecting pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a flexible connecting pipe used for connecting a diameter- expanding retracting system employed when a pipe, etc., for laying a cable are laid into soil and a pilot pipe as a propulsion guide. SOLUTION: In the connecting pipe connecting a pilot pipe C and a piston rod 62 for a diameter-expanding retracting system, the connecting pipe has a spherical receiver 2 having a connector 6 with the pilot pipe C and a spherical shaft 3 being fitted to the spherical receiver 2 and a connector 7 with the piston rod 62. The spherical receiver 2 has an internal spherical section 2-1 and a shaft hole section 2-2 unified with the internal spherical section 2-1, and the spherical shaft 3 has an external spherical section 3-1 fitted to the internal spherical section 2-1 and a shaft section 3-2 unified with the external spherical section 3-1 and inserted to the shaft hole section 2-2. Accordingly, the spherical shaft 3 is constituted in a bendable manner to the spherical receiver 2. The sectional shapes of the shaft hole section 2-2 and the shaft section 3-2 are formed in a polygon respectively, and the relative rotation of the spherical receiver 2 and the spherical shaft 3 is inhibited.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible connecting pipe used for a diameter increasing and retracting device for laying a cable laying pipe, water and sewage pipe, a gas pipe, etc. in the soil without digging. . In other words, when the propulsion pipe is laid by the diameter expanding and retracting device from the direction opposite to the installation direction of the pilot pipe in the second step using the pilot pipe laid in the first step of the pipe propulsion method as a guide, The present invention relates to a connection pipe suitable for connecting

[0002]

2. Description of the Related Art FIGS. 7 and 8 show an example of a procedure for laying a pipe by a small-diameter propulsion method. FIG. 7 shows a process of laying the pilot pipe C from the starting shaft A to the reaching shaft B as a first process. The main pushing device D is installed in the starting stand A, the outer cylinder E1 of the tip device E is extended, and the tip head E2 is pierced in the soil (FIG. 7A). Next, the cylinder of the main pushing device D is extended, and the leading end device E and the pilot pipe C are press-fitted to a length commensurate with the leading end length of the leading end device E while contracting the leading end device E (FIG. 7B). Then, by repeatedly performing the drilling and the press-fitting, the pilot pipes C are successively added and propelled into the soil. In that case, the direction control is appropriately performed by the tip head E2, and the pilot pipe C is laid while correcting the deviation in the propulsion direction (FIG. 7C). When the pilot pipe C reaches the reaching shaft B, the tip device E is removed from the reaching shaft B (FIG. 7).
D).

Next, as shown in FIG. 8, as a second step, a propulsion pipe F having a diameter larger than that of the pilot pipe C is laid from the reaching shaft B to the starting shaft A. First, the diameter expanding and retracting device G is mounted on the leading pilot pipe C (FIG. 8A).

[0004] The diameter increasing and retracting device G includes a piston rod G2 extended by a single-acting hydraulic cylinder G1.
A pilot pipe C is connected to the tip of G2, and a propulsion pipe F is connected to the rear of the diameter expanding and retracting device G.

[0005] Hydraulic oil is supplied from a hydraulic pump on the ground to a single-acting hydraulic cylinder G1 of the expanding and retracting device G, and piston rod G2
To excavate the soil first. Hydraulic oil is supplied from the starting shaft A through the pilot pipe C to the piston cylinder G2.
This is performed via a hydraulic hose G4 connected to the oil passage G3.
Next, the enlarged diameter retraction device G is retracted by the original pushing device D using the pilot pipe C as a guide, and the propulsion pipe F connected to the enlarged diameter retraction device G is sequentially retracted into the soil. Then, the drilling and the retraction are repeated to reach the starting shaft A while adding the propulsion pipe F.
At this time, in the starting shaft A, the pilot pipes C are sequentially removed and collected by a length corresponding to the retracted length of the propulsion pipe F.

[0006]

However, when the propulsion pipe is pulled in the second step, the following problems are caused by the influence of the installation state of the pilot pipe. Direction control is performed when the pilot pipe is laid in the first step, but the laying state of the pilot pipe is not necessarily a straight state,
It may be in a curved state. In the second step, the propulsion pipe is drawn in using the pilot pipe as a guide. Therefore, if the pilot pipe is laid in a curved state, the diameter expanding and retracting device cannot follow this curvature, and the operating resistance of the single-acting hydraulic cylinder increases. The operation may be slow or may not work at all. This is because the hydraulic cylinder itself has a linear motion structure, so that if the pilot pipe is laid in a curved state, a force in the bending direction acts on the piston rod.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, according to the present invention, a flexible connecting pipe is interposed in the connection between the pilot pipe and the expanding and retracting device. That is, the present invention is a hollow cylindrical flexible connection pipe for connecting one connection target and the other connection target, and a spherical receiving member provided with a connecting member for the one connection target, and the spherical receiving member. And a spherical shaft provided with a connecting tool to the other connection object.

Here, in order to suppress relative rotation between the spherical receiving member and the spherical axis, the spherical receiving member has an inner spherical surface portion and a shaft hole integral with the inner spherical surface portion. An outer spherical surface portion that fits into the inner spherical surface portion, and a shaft portion that is inserted into the shaft hole portion integrally with the outer spherical surface portion, and the cross-sectional shapes of the shaft hole portion and the shaft portion are each polygonal. It is desirable that

In this case, the opposite side dimension of the shaft hole is larger than the opposite side dimension of the shaft part, but is preferably smaller than the opposite side dimension of the shaft part.

Further, it is preferable to provide an elastic dust seal for preventing foreign matter from entering a fitting portion between the spherical receiving member and the spherical shaft.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a sectional view of the connecting pipe of the present invention in a straight state, and FIG. 2 is a sectional view of the connecting pipe in a bent state.

The connecting pipe 1 of the present invention comprises a pilot pipe C (one connection target) and a piston rod G2 in a diameter expanding and retracting device.
, And is configured to be bendable with a spherical receiving member 2 and a spherical axis 3.

The spherical receiving member 2 has a substantially hollow cylindrical shape.
The outer circumference is formed in a polygonal shape, and has an inner spherical surface portion 2-1 having an inner spherical surface on the inner circumference, and a shaft hole portion 2-2 having a cylindrical surface on the inner circumference integrally with the inner spherical surface portion 2-1. . On the other hand, the spherical shaft 3 is also substantially hollow cylindrical, and has an outer spherical portion 3-1 provided at one end and a shaft portion 3-2 having a polygonal outer periphery continuous with the outer spherical portion 3-1. Equipped. The outer spherical surface portion 3-1 is fitted into the inner spherical surface portion 2-1, and the shaft portion 3-2 is inserted through the shaft hole portion 2-2. (See FIG. 2) so that the spherical axis 3 can be bent with respect to the spherical receiving member 2 by sliding.

Here, tapered pipes are provided at both ends of the connecting pipe 1 to reduce the resistance when traveling in the soil. On the pilot pipe side of the connecting pipe 1, a front tapered pipe 4 fitted externally to the spherical receiver 2 is provided.
2 is provided with a rear tapered tube 5 fitted externally. Then, the connecting pipe 1 and the piston rod G2 or the pilot pipe C
The front connecting member 6 and the rear connecting member 7 were used for connection with the connecting member.

The front connector 6 has a male screw 6-1 at one end,
It has a cylindrical shape with an inner peripheral projection 6-2 at the other end. The connection between the spherical receiving member 2 and the pilot pipe C is performed via the tightening nut 8 and the front tapered pipe 4. Inner circumference projection of tightening nut 8
8-1 is engaged with the outer peripheral projection 2-3 of the spherical support, and the female screw 8-2 of the tightening nut is connected to the male screw 4-1 of one end of the front taper tube.
And screw them together. Furthermore, the inner peripheral protrusion 6-
2 with the outer circumferential groove 4-2 at the other end of the front tapered tube,
The female screw at the tip of the pilot tube is screwed into the male screw 6-1 of the front connector to connect the pilot tube C from the spherical receiver 2.

AA of FIG. 1 in such a connection structure.
An arrow view is shown in FIG. The outer shape of the spherical receiver 2 is a polygon,
Since the inner peripheral shape of the front tapered tube 4 closely fitted here is also formed in a polygonal shape, the front tapered tube 4 does not rotate with respect to the spherical receiving member 2. On the other hand, the front tapered tube 4 and the front connector 6 are, as described above with reference to FIG.
4-2 and the inner peripheral projection 6-2 are connected by engagement with each other.
6 is rotatable.

The rear connecting member 7 is a cylindrical member having a female screw 7-1 at one end and an inner peripheral projection 7-2 at the other end. The connection between the spherical shaft 3 and the piston rod G3
7-2 into the outer groove 3-3 of the shaft 3-2,
Insert the male screw at the tip of the piston rod into 7-1.
The spherical shaft 3 and the rear connecting member 7 are connected by the engagement of the outer peripheral groove 3-3 and the inner peripheral projection 7-2, and both the members 3 and 7 are configured to be rotatable.

A hydraulic hose G4 for supplying hydraulic oil to the diameter expanding and retracting device is inserted into the connection pipe 1. The hydraulic hose G4 is introduced from the ground through the start shaft and the pilot pipe into the connection portion, and is connected to the piston rod G2 via the connector.
Connected to oilway G3.

By connecting the spherical receiving member 2 and the spherical shaft 3 as described above, the relative rotation between the spherical receiving member 2 and the spherical shaft 3 is suppressed, and the hydraulic hose G4 is twisted and cut. Can be prevented. This rotation stopping mechanism will be described with reference to FIGS. FIG. 4 is a view taken along the line BB in FIG.
5A is a cross-sectional view showing a state in which the spherical axis is rotated left from the state in FIG. 4, and FIG. 5B is a cross-sectional view showing a state in which the spherical axis is rotated right from the state in FIG.

As shown in FIG. 4, the axial hole portion 2
2 and the cross-sectional shape of the shaft portion 3-2 of the spherical axis are polygonal and similar. In this example, each of them is a regular octagon. Here, assuming that the diagonal dimension of the shaft hole 2-2 is H, the diagonal dimension of the same is I, the diagonal dimension of the shaft part 3-2 is J, and the diagonal dimension of the same is K, they have the following relationship. . H>J>I> K For this reason, even if it is attempted to relatively rotate the spherical support 2 and the spherical shaft 3, as shown in FIG. The rotation is stopped where it comes into contact with the inner peripheral surface of 2. Thus, the rotation of the spherical receiving member 2 and the spherical shaft 3 in the connecting pipe 1 is suppressed, and the hydraulic hose G4 (FIGS. 1 and 2) is prevented from being twisted.

Of course, even if this rotation stopping mechanism is provided, there is no effect on the bending mechanism between the spherical receiving member and the spherical axis. FIG. 6 is a view taken along the line CC in FIG. FIG.
As shown in the figure, even if the spherical shaft 3 is bent with respect to the spherical receiving member 2, the shaft portion 3-2 is eccentric with respect to the shaft hole portion 2-2,
The spherical receiver 2 and the spherical shaft 3 can be bent within the range of the difference between the diagonal dimension H of 2-2 and the diagonal dimension J of the shaft portion 3-2.

In this embodiment, a dust seal 9 is provided to prevent foreign matter such as earth and sand from entering the fitting portion between the spherical receiving member 2 and the spherical shaft 3 (see FIGS. 1 and 2). The dust seal 9 has an annular shape and a convex cross-sectional shape, and is made of an elastic material such as rubber so that the dust seal 9 can be deformed following the bending between the spherical receiving member 3 and the spherical shaft 2. . Here, a dust seal 9 is interposed in a space surrounded by the rear tapered tube 5, the tightening nut 8 and the spherical receiving member 2 on the outer periphery of the shaft portion 3-2.

With the connecting pipe having such a configuration, the connecting portion itself is bent when the piston rod of the diameter expanding and retracting device is connected to the pilot pipe. Can be done. In that case, it is possible to suppress the excessive bending stress from being applied to the piston rod. Further, by preventing the relative rotation between the spherical receiving member and the spherical shaft, the hydraulic hose that supplies the working oil to the diameter expanding and retracting device through the inside of the connection portion is not twisted and cut.

[0024]

As described above, since the connecting pipe of the present invention has a bending function, if the connecting pipe is used to connect the pilot pipe to the expanding and retracting device, the connecting pipe can be expanded even if the pilot pipe is laid in a curved state. The diameter retracting device can be made to follow. In particular, by providing the rotation stopping mechanism at the connection portion, it is possible to prevent the hydraulic hose that supplies the hydraulic oil to the diameter increasing and retracting device from being cut off.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a connecting pipe of the present invention in a straight state.

FIG. 2 is a cross-sectional view of the connecting pipe of the present invention in a bent state.

FIG. 3 is a view taken in the direction of arrows AA in FIG. 1;

FIG. 4 is a view taken in the direction of arrows BB in FIG. 1;

5A is a cross-sectional view showing a state in which the spherical axis is rotated left from the state in FIG. 4, and FIG. 5B is a cross-sectional view showing a state in which the spherical axis is rotated right from the state in FIG. is there.

FIG. 6 is a view taken in the direction of arrows CC in FIG. 2;

FIG. 7 is an explanatory view of a first step using a tip device for pipe propulsion in a pipe laying process of a consolidation non-discharge method, (A) when the tip device is extended, (B) when the main pushing device is extended, ( (C) shows the direction control of the tip device, and (D) shows the completion of the pilot pipe installation.

FIG. 8 is an explanatory view of a second step using a diameter expanding and retracting device in a pipe laying process of a consolidation non-discharge method, (A) when the diameter expanding and retracting device is mounted, and (B) when the diameter expanding and retracting device is retracted. , (C) shows when the diameter expanding and retracting device is first drilled, and (D) shows when the diameter expanding and retracting device is retracted.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Connection pipe 2 Spherical receptacle 2-1 Inner spherical surface part 2-2 Shaft hole part 2-3 Outer peripheral protrusion 3 Spherical axis 3-1 Outer spherical part 3-2 Shaft part 3-3 Outer peripheral groove 4
Front taper tube 4-1 Male screw 4-2 Outer groove 5 Rear taper tube 6 Front connector 6-1 Male screw 6-2 Inner projection 7 Rear connector 7-1 Female screw 7-2 Inner projection 8 Tightening nut 9 Dust seal A Starting shaft B Reaching shaft C
Pilot tube E Tip device E1 Outer cylinder E2 Tip head F Propulsion tube G Expanding retracting device G1 Single-acting hydraulic cylinder G2 Piston rod G3 Oilway
G4 hydraulic hose

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Akio Kishi 1-chome, Taya-cho, Sakae-ku, Yokohama-shi Sumitomo Electric Industries, Ltd. Yokohama Works (72) Inventor Hiroshi Irie 3-19-2 Nishishinjuku, Shinjuku-ku, Tokyo Japan Inside Telegraph and Telephone Corporation (72) Inventor Akira Sawaguchi 3-19-2 Nishishinjuku, Shinjuku-ku, Tokyo Japan Inside Telegraph and Telephone Corporation (72) Junichi Shirakawa 3--18-10 Moto-Asakusa, Taito-ku, Tokyo Eye Inside Wreck Giken Co., Ltd.

Claims (4)

[Claims] 1. A hollow cylindrical flexible connection pipe for connecting one connection object and another connection object, wherein the spherical connection member has a connection tool for connecting to the one connection object; And a spherical shaft provided with a connector for connecting to the other connection object. 2. The spherical receiving member has an inner spherical surface portion, and a shaft hole integral with the inner spherical surface portion, and the spherical axis has an outer spherical surface portion fitted to the inner spherical surface portion, and an outer spherical surface portion. A shaft portion integrally inserted into the shaft hole portion, wherein the cross-sectional shapes of the shaft hole portion and the shaft portion are each polygonal, so as to suppress relative rotation between the spherical receiving member and the spherical axis. The flexible connection pipe according to claim 1, wherein the flexible connection pipe is configured. 3. The flexible connection pipe according to claim 2, wherein the opposite dimension of the shaft hole is larger than the opposite dimension of the shaft, but smaller than the diagonal dimension of the shaft. 4. The flexible connection pipe according to claim 1, further comprising an elastic dust seal for preventing foreign matter from entering a fitting portion between the spherical receiving member and the spherical shaft.