JP2007139156A - Pipe travel guide tool for sleeve jacking method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the volume, and to improve mounting workability. <P>SOLUTION: A pipe travel guide tool 10 is fitted in a pipe P in the jacking method wherein the pipe P is inserted into the precedent pipe P to connect the pipes P together for newly arranging a pipeline inside a sleeve pipe P'. A spherical roller 12 is charged in an annular casing 11 having a U shaped cross section so as to be unable to be removed or to be freely rolled, the casing 11 is locked by a socket 2, and the roller 12 is rolled on an inner surface of the sleeve pipe P'. It is enough that the casing has a size (diameter) of being fitted to a straight pipe part and being prevented from slipping out of the socket if the casing is locked by the socket, and the structure can be facilitated. Attachment to the pipe can be performed only by fitting the casing into the pipe, and enhanced workability is exhibited. In the structure wherein the roller is charged in the casing, the casing supporting the roller is usually in a shape of a gutter, and the volume when the casing with the roller is fitted to the pipe is the sum of the thickness of the casing and the diameter of the roller, and the volume is reduced. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe travel guide device used for a pipe propulsion method in which a pipe for transporting fluid used for water supply, gas, sewerage, etc. is laid without cutting.

  As a method of embedding fluid transport pipes such as ductile cast iron pipes, the open-cut method of excavating and laying the ground has been common, but nowadays traffic volume has increased not only on main roads but also on general roads. Therefore, it is difficult to block traffic due to the open-cut method. For this reason, only the starting and reaching shafts are excavated, and fume pipes and steel pipes are propelled and buried as sheath pipes (sheath pipes), and then PI pipe and PII type ductile cast iron pipes are inserted, and the existing pipe propulsion method, Propelling methods such as pipe-in-pipe method (PIP method), in which pipes are used as sheath pipes and new pipes with a small diameter are inserted into the pipes to renew the pipes, are now widely used (hereinafter referred to as sheath) Both the pipe propulsion method and the PIP method are called “sheath tube propulsion methods”).

  As shown in FIG. 8, the sheath propulsion method inserts and lays a new pipe P having a smaller diameter in an existing pipe (sheath pipe) P ′ buried between the start pit S and the arrival pit R. The hydraulic jack J is installed in the starting pit S, the rear part of the hydraulic jack J abuts against the reaction force receiver H, and the front part presses the new pipe P through the pushing angle B. Yes. The new pipe P is sequentially joined by inserting the insertion port 1 at the tip end thereof into the receiving port 2 at the rear end part of the preceding new pipe P, and is pushed into the existing pipe P ′. A leading sled K for reducing insertion resistance is attached to the tip of the leading new pipe P.

  When the new pipe P is joined and traveled within the existing pipe P ', the new pipe P slides and moves (runs) on the inner surface of the sheath pipe P' as shown in FIG. In this case, when the insertion length of the new pipe P (the length between the start pit S and the arrival mine R) is increased, the insertion force increases or the allowable transmission force of the new pipe P decreases due to bending of the pipe joint. For example, the allowable transmission force of the new pipe P may be exceeded. If the allowable transmission force is exceeded, the new pipe P will be damaged, and hence no further insertion is possible.

For this reason, as shown in FIG. 10, there is a technique in which a travel guide device having casters 3 is provided on the outer peripheral surface of the new pipe P, and the caster 3 is traveled on the inner surface of the sheath pipe P ′ to reduce travel resistance ( Patent Document 1). The traveling guide device is a saddle band-like shape in which a flange 4 having an L-shaped cross section divided into four parts is fastened at its end face, and a caster 3 is rotatably fitted to a fastening bolt 5 of the divided flange 4. It is.
JP 2002-276284 A

In addition, when pulling a plurality of pipes into the underground pipe, there is a technique for preventing rolling by providing a ball bearing on the outer peripheral surface of the cylindrical main body as a leading guide for the drawing (see Patent Document 2). .
JP-A-7-293746

  Although the traveling of the new pipe P by the traveling guide apparatus with casters 3 is effective as it is, it is necessary to have a sufficiently large (sufficiently rising) fastening piece 6 in order to fasten the split flange 4 firmly. Yes, since the caster 3 is attached to the fastening piece 6, the caster 3 becomes vigorous and the caster 3 becomes high (projects greatly from the outer peripheral surface of the new pipe P).

If the caster 3 is high, the travel guide device becomes bulky, and thus a sufficient gap (gap) is required between the inner surface of the sheath P 'and the outer surface of the new tube P. If the clearance is made large, a new pipe P having a small nominal diameter will be used, and there may be a case where a sufficient distribution area cannot be obtained.
Further, since the new pipe P is usually required to have a required nominal diameter, the gap is narrow. In this case, there may be a case where the travel guidance instrument with the casters 3 cannot be used.

  Furthermore, since the traveling guide apparatus with the casters 3 is a saddle band formed by fastening the flange 4 having an L-shaped cross section divided into four at its end face, the fastening work is necessary and the attachment work is not necessary. It is complicated.

  An object of the present invention is to reduce the bulk of the travel guide device and to improve the mounting workability.

In order to achieve the above object, according to the present invention, first, this type of pipe is composed of a straight pipe portion having an insertion port 1 and a receiving portion having a receiving port 2, and the straight pipe portion is formed from the receiving portion. Focusing on the fact that the outer diameter is small, an annular casing forming a part of the travel guide device is fitted to the straight pipe portion, and the casing is prevented from being detached at the receiving portion during traveling.
If it is prevented from coming off at the receiving part, the casing can be fitted in the straight pipe part and has a size (diameter) that does not come out from the receiving part, so the configuration of the travel guide device (casing) is simple. In addition, since the attachment to the new pipe only needs to fit the casing into the straight pipe portion, workability is also good.

Next, in the present invention, a spherical roller is loaded into the casing so as not to be detached and rotatable. That is, the ball bearing structure disclosed in Patent Document 2 is adopted.
The structure (ball bearing structure) in which a spherical roller is loaded in a non-detachable and rotatable manner in this casing (ball bearing structure) is usually a bowl-shaped casing that supports the roller (ball), and the casing with the roller is fitted into the tube. The bulk (height protruding from the outer peripheral surface of the pipe) is the sum of the thickness of the casing and the diameter of the roller, and can be considerably lower than the travel guide apparatus with casters 3.
For this reason, even when there is not a sufficient gap between the inner surface of the sheath P ′ and the outer surface of the new tube P, there are many cases where this travel guide device can be attached.
In addition, since the spherical roller has a free rolling direction, it smoothly follows the movement of the tube and ensures smooth running as compared with the caster 3 shown in FIG. In particular, since the pipe is a long object and travels while being bent at the joint portion, and the inner surface of the existing pipe is usually severely uneven, traveling guidance with this roller having high followability is effective.

  As described above, the travel guide device according to the present invention has a ball bearing structure and is attached to the pipe by fitting it into the straight pipe portion, so that it is sufficient for the inner surface of the sheath P 'and the outer surface of the new pipe P. Even if there is no gap, it can be adopted and the workability is improved.

  As an embodiment of the present invention, in a propulsion method in which a pipe passage is newly installed in a sheath pipe by inserting a pipe insertion port into a preceding pipe receptacle and running the pipe, In a guide device, a spherical roller is loaded into an annular cross-section U-shaped casing so as not to be disengageable and rotatable, and the casing is fitted to a straight pipe portion of the pipe to prevent it from coming off at the receiving port. However, it is possible to adopt a configuration in which the roller rolls on the inner surface of the sheath and the tube travels in the sheath.

In this configuration, the roller may be intermittently loaded in the circumferential direction of the casing, and a spacer may be provided in the intermittent portion to prevent the roller from moving in the circumferential direction.
The rollers do not need to have a gap over the entire circumference of the casing (the entire outer surface of the pipe), and may have an interval that can accommodate rolling during pipe running. For this reason, what is necessary is just to determine the intermittent length suitably based on experiment and actual operation (experience). For example, it is assumed that about five rollers are provided at intervals of 90 degrees.
The spacer can be formed by deforming the side wall of the casing inward.

The casing is composed of an annular plate and a hook-like portion closed at both ends intermittently provided in the circumferential direction of the plate, and the roller is loaded in a non-detachable and rotatable manner in the hook-like portion. You can also
Also, the roller rolling surface on the outer surface of the roller or the inner surface of the casing may be coated with a lubricant such as fluororesin (the rolling surface may be a smooth surface), or the roller may be made of a low friction material such as polyacetal. It is preferable to make the roller roll smoothly. Each of these treatments can be used in combination.

An embodiment is shown in FIGS. 1 to 4, and a pipe travel guide device 10 of this embodiment is configured by loading a roller 12 made of a steel ball around the entire circumference of an annular cross-sectional U-shaped casing 11. The roller 12 can be made of a low friction material such as polyacetal.
For example, as shown in FIG. 4A, the casing 11 is formed by shifting the steel pipe 11a slightly from the center line into two parts and bending the larger 11b into an annular shape as shown in FIG. 4B. . At this time, the butt end portion can be joined by welding or the like.

The roller 12 is loaded into the casing 11 thus formed. The diameter of the roller 12 is substantially the same as the inner diameter of the casing 11 (steel pipe 11a). When loaded, the opening of the casing 11 becomes narrower than its roller diameter, and the roller 12 smoothly rolls without being detached from the casing 11.
Grease is applied (coating) to the inner surface of the casing 11, a fluororesin coating, or a sheet impregnated with a fluororesin is adhered (coating) to form a smooth surface. A similar treatment can be applied to the outer surface of the roller 12 to form a smooth surface.

  As shown in FIGS. 1 and 2, this pipe travel guide device 10 is provided with a new pipe line in the sheath pipe P ′ while inserting and inserting the insertion opening 1 of the pipe P into the receiving opening 2 of the preceding pipe P. When doing so, it fits and attaches to the outer peripheral surface of each pipe P. At this time, it is preferable to bring the pipe travel guide device 10 closer to the receiving port 2 side, but this is not always necessary. This is because it moves as the pipe P travels and is eventually locked to the receiving port 2 part.

  As shown in FIG. 1, the travel guide device 10 attached to each pipe P is prevented from being detached at the receiving port 2 portion as shown in FIG. Rolls the inner surface of the sheath P 'to smoothly guide the new tube P. At this time, even if rolling occurs in the tube P, any one of the rollers 12 rolls on the inner surface of the sheath P 'to cope with the rolling and ensure smooth running.

FIGS. 5 to 7 show other embodiments of the pipe travel guide device 10, and each embodiment is one in which the roller 12 is intermittently loaded in the circumferential direction of the casing 11.
In the embodiment of FIG. 5, five rollers 12 are provided at intervals of 90 degrees, and a spacer 13 is provided between them. The spacer 13 is fixed to the casing 11 by welding / bonding or the like using a bent round steel bar or square steel bar. At this time, the spacer 13 has a height (thickness) that does not hinder the rolling of the rollers 12.
In the embodiment of FIG. 6, the spacer 13 is formed by deforming the side wall of the casing 11 inward.
In the embodiment of FIG. 7, the casing 11 is composed of an annular steel plate 14 and a flange-like portion 15 having both ends closed, in which five rollers 12 are provided at four equal intervals (90-degree intervals) of the steel plate 14. Is.

Similarly, when the pipe travel guide apparatus 10 of each of these embodiments is inserted into the receiving port 2 of the preceding pipe P by inserting the insertion opening 1 of the pipe P, a pipe line is newly installed in the sheath P '. The pipe P is fitted and attached to the outer peripheral surface.
Similarly, the travel guide apparatus 10 attached to each pipe P is prevented from coming off at the receiving port 2 part during traveling as the pipe P is inserted, and the roller 12 rolls on the inner surface of the sheath P '. Thus, the pipe P is guided smoothly. Similarly, even if rolling occurs in the pipe P, the roller 12 rolls on the inner surface of the sheath P 'to cope with the rolling and ensure smooth running.

An example is shown, (a) is the principal part cutting | disconnection front view of the use condition, (b) is a cutting | disconnection side view. 1 is an enlarged view of the main part of FIG. Partially cut perspective view of one embodiment Production explanatory diagram of the casing of the same embodiment Another embodiment is shown, (a) is a partially cut side view, (b) is a cutaway perspective view of the same part. Another embodiment is shown, (a) is a partially cut side view, (b) is a cutaway perspective view of the same part. Another embodiment is shown, (a) is a partially cut side view, (b) is a cutaway perspective view of the same part. Illustration of sheath tube propulsion method Explanatory diagram of conventional sheath tube propulsion method Explanatory diagram of conventional sheath tube propulsion method

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Insert port 2 Receiving port 10 Pipe travel guide instrument 11 Casing 12 Roller 13 Spacer 14 Steel plate 15 Cage-shaped part P New pipe P 'Sheath pipe (existing pipe)

Claims (5)

The pipe (P) in the propulsion method in which the pipe (P) insertion port (1) is inserted into the receiving pipe (2) of the preceding pipe (P) and a pipe line is newly installed in the sheath pipe (P '). P) A travel guide instrument (10) of the pipe (P) fitted to the outer peripheral surface,
In a circular U-shaped casing (11) having a circular cross section, a spherical roller (12) is loaded in a non-removable and rotatable manner on the entire circumference, and the casing (11) is placed in the straight pipe portion of the pipe (P). The roller (12) is rolled onto the inner surface of the sheath tube (P ′) while being fitted and kept at the receiving port (2), thereby causing the tube (P) to travel inside the sheath tube (P ′). A pipe travel guide device characterized by that.   The roller (12) is intermittently loaded in the circumferential direction of the casing (11), and a spacer (13) is provided in the intermittent portion to prevent the roller (12) from moving in the circumferential direction. The pipe travel guide apparatus according to claim 1.   The pipe travel guide device according to claim 2, wherein the spacer (13) is formed by deforming a side wall of the casing (11) inward.   The casing (11) includes an annular plate (14) and a hook-like portion (15) closed at both ends intermittently in the circumferential direction of the plate (14), and the hook-like portion (15). The tube travel guide device according to claim 1, wherein the roller (12) is loaded so as not to be detached and rotatable.   The roller (12) is made of a low-friction material, or the roller (12) outer surface or the roller rolling surface of the casing (11) inner surface is coated with a lubricant, and the inner surface of the casing (11) of the roller (12). 5. The pipe travel guide device according to claim 1, wherein the rolling is smooth.

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