JP4791413B2 - Pipe propulsion guide structure and pipe propulsion method - Google Patents

Description

  The present invention relates to a pipe propulsion guide structure for a pipe used in a pipe propulsion method in which a pipe for transporting fluid used for water supply, gas, sewerage, etc. is laid without opening.

  As a method for embedding a fluid transport pipe such as a ductile cast iron pipe, an open-cut method for excavating and laying the ground is generally used. However, in recent years, traffic has increased not only on main roads but also on general roads, making it difficult to block traffic due to the open-cut method. For this reason, only the starting and reaching shafts are excavated, and a fume pipe or steel pipe is pushed and buried as a sheath pipe (sheath pipe), then a ductile cast iron pipe is inserted, or an existing pipe is used as a sheath pipe. A propulsion method such as a pipe-in-pipe method, in which a new pipe with a small diameter is inserted to renew the pipe line, has come to be widely adopted.

  In the pipe-in-pipe method, as shown in FIG. 6, a new pipe P having a smaller diameter is inserted and laid in the sheath pipe P ′ buried between the start pit S and the arrival pit R. It is. Specifically, first, the hydraulic jack J is installed in the start pit S. The rear portion of the hydraulic jack J is brought into contact with the reaction force receiver H, and the front portion is arranged so as to press the new pipe P through the pressing angle B. As a result, the new pipe P is sequentially joined by inserting the insertion port 1 at the distal end thereof into the receiving port 2 at the rear end of the preceding new pipe P, and is pushed into the sheath pipe P ′. A leading sled K for reducing the insertion resistance is attached to the tip of the leading pipe P.

  By the way, in recent years, pipe pipes are also required to have earthquake resistance, and as a pipe joint structure having the earthquake resistance, one in which the insertion opening 1 can be expanded and contracted (removable) in a required range with respect to the receiving opening 2 is known. .

  As shown in FIG. 7, this earthquake-resistant pipe joint structure has a projection 3 at the tip of the insertion port 1 of the new pipe P, and a lock ring 5 and a rear end portion that are separated by a predetermined length on the inner surface of the receiving port 2 of the preceding pipe P. 9 so that the projection 3 can be expanded and contracted (inserted / removed) between the lock ring 5 and the back end portion 9 and is prevented from coming out of this range. .

  When this type of earthquake-resistant pipe joint structure is employed in the propulsion method described above, there is a problem in the method of laying the pipe P while securing the expansion allowance within the required range. This expansion / contraction allowance can be ensured by positioning the protrusion 3 of the insertion slot 1 in the middle of the lock ring and the back end and propelling it. As a technique for solving the problem, one disclosed in Patent Document 1 (see FIG. 7) is known.

  This is related to the NS type joint structure. A projection 3 is provided at the tip of the insertion slot 1, a lock ring 5 is provided on the inner surface of the receptacle 2 via a centering rubber 4, and a seal rubber ring 6 is interposed in the receptacle 2. Then, the insertion port 1 is inserted, and a propulsive force transmission material 8 made of low-foam polystyrene or the like is interposed between the tube propulsion guide 7 fixed to the outer peripheral surface of the insertion port 1 and the end surface of the receiving port 2. .

  As shown in FIG. 7, this technique maintains the tip (projection 3) of the insertion slot 1 in the middle of the expansion / contraction allowance L during propulsion, and propulsion force during ground changes such as earthquakes. When the transmission material 8 contracts or collapses, the insertion slot 1 moves in the axial direction for the contraction allowance L1 or the allowance allowance L2 and absorbs the fluctuation, and prevents further contraction and disconnection. Prevent damage to fittings.

  Further, the tube propulsion guide 7 is provided with rollers 10 at equal intervals in the circumferential direction, and when the tube P is propelled, the roller 10 is rolled on the inner surface of the sheath tube P ′ so that the resistance during propulsion is minimized and smooth. To promote.

JP 2000-17987 A

  By the way, mortar lining is often applied to the inner surface of the sheath pipe P ′ of an existing ductile pipe or the like. This mortar lining is often neutralized over time, and the surface often becomes brittle.

  For this reason, when a new pipe P is inserted into the sheath pipe P ', a phenomenon occurs in which the roller 10 of the pipe propulsion guide 7 bites into the mortar lining. When this bite occurs, the mortar lining peels off. When the mortar lining is peeled off, a situation as shown in FIGS.

  That is, as shown in FIG. 8A, as the pipe P moves, a part of the mortar lining Q ′ of the sheath P P peels off, and this peeled mortar lining (hereinafter referred to as “peeled material”). ) A part of M adheres to the rolling surface of the roller 10. Next, as shown in FIG. 8 (b), the roller 10 is rotated while the peeled material M is adhered to the rolling surface of the roller 10, and the peeled material M is attached to the pipe P as shown in FIG. 8 (c). Accumulated between the roller 10 and the sheath P 'on the traveling side. As the accumulated exfoliated matter M increases as shown in FIG. 8D, the exfoliated matter M may adhere to the sheath P '. When the peeled material M sticks to the sheath P ', in order for the tube P to move, it becomes necessary for the roller 10 to get over the accumulated matter of the peeled material M. At this time, the resistance to the movement of the tube P Will occur.

  Therefore, when inserting a new pipe into the sheath pipe, the present invention is designed so that even if the mortar lining on the inner surface of the sheath pipe is peeled off, the peeled mortar lining is moved to the roller and sheath pipe on the traveling direction side of the new pipe. The purpose is to prevent the tube from being accumulated and fixed, and to smoothly insert the new tube into the sheath tube.

  The present invention solves the above problems by providing a cleaning member that peels off the adhering matter adhering to the rolling surface of the roller and removes it on the opposite side of the tube traveling direction.

  According to the present invention, the cleaning member peels off the adhering matter adhering to the rolling surface of the roller and drops it to the opposite side of the pipe traveling direction. Therefore, the new tube can be smoothly inserted into the sheath.

  Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1 (a), the tube propulsion guide structure according to the present invention inserts the insertion port 1 of the tube P into the receiving port 2 of the preceding tube P and joins the tube P to the sheath tube P ′. This is a structure used in the propulsion method in which the pipe is pushed in and a pipe line is newly installed in the sheath pipe P ′.

  This tube propulsion guide structure is a structure having a roller 10 provided on the outer peripheral surface of the tube P. As a specific example, the tube propulsion guide 7 fixed to the outer peripheral surface of the insertion slot 1 and the tube propulsion guide 7 The structure of the roller 10 arranged at equal intervals in the circumferential direction. Examples of the tube propulsion guide structure include structures as shown in FIGS. 1 (a) to 1 (d). The pipe propelling guide 7 is divided into a plurality of divided pieces, both ends of each divided piece are bent outward, the divided pieces are arranged on the outer periphery of the pipe P, and the bent portions of the divided pieces are The space between the bent portions of the adjacent divided pieces is fixed with a fixing member such as a bolt and fixed to the pipe P. At this time, a gap is provided between the bent portion of each divided piece and the bent portion of the adjacent divided piece, and the roller 10 is rotatably attached.

  A cleaning member 11 is provided in the tube propulsion guide structure. In general, mortar lining Q 'is often applied to the inner surface of the existing sheath P'. In many cases, the mortar lining Q 'is gradually neutralized over time, and the surface thereof becomes brittle. For this reason, when a new pipe P is inserted into the existing sheath pipe P ′, a phenomenon occurs in which the roller 10 bites into the mortar lining Q ′. When this bite occurs, peeling of the mortar lining Q 'occurs. The exfoliated material of the mortar lining Q ′ adheres to the rolling surface of the roller 10 and becomes an adhering material M. The cleaning member 11 is for peeling off deposits adhering to the rolling surface of the roller 10. Then, the cleaning member 11 drops the deposit M on the side opposite to the traveling direction of the pipe P. Thereby, when the pipe P advances, the roller 10 does not get over the accumulated matter M accumulated, and the pipe P can be smoothly inserted into the sheath P '.

  Examples of the cleaning member 11 include a sponge-like material, a brush, and a blade. When the sponge-like object 11a is used as the cleaning member 11, the sponge-like object 11a is, as described above, specifically at the position where the deposit M is removed in the direction opposite to the traveling direction of the pipe P, specifically, FIG. c) As shown in (d), between the pipe P and the roller 10, more specifically, the bent portion of the split piece of the pipe propulsion guide 7 constituting the pipe propulsion guide structure and the adjacent split piece It is attached between the bent portion and between the pipe P and the roller 10 so as to be in contact with the rolling surface of the roller 10.

  As described above, the tube propulsion guide 7 is between the bent portion of the split piece of the pipe propulsion guide 7 and the bent portion of the adjacent split piece, and between the pipe P and the roller 10. However, as shown in FIGS. 2 (a) and 2 (b), a through-hole 12 of a fixing member such as a bolt is provided in the sponge-like object 11a and fixed to the through-hole. By passing the member, the sponge-like object 11a can be fixed at a predetermined position.

  Examples of the shape of the sponge-like object 11a include a rectangular parallelepiped shape as shown in FIGS. 2 (a) and 2 (b). In this case, as shown in FIG. 1 (d), the roller 10 may be arranged so as to bite into the sponge-like object 11a, and the sponge-like object 11a may be deformed at these contact portions. Furthermore, although not shown, when using the sponge-like object 11a with little deformability, the roller 10 and the sponge-like object 11a may be arranged so as to contact each other.

  As another example, an example of a sponge-like material 11a 'as shown in FIGS. 3 (a) and 3 (b) can be given. This sponge-like object 11 a ′ is provided with an adhesion exclusion portion 13 having a step surface 13 a on the surface in contact with the roller 10. When this sponge-like object 11a ′ is attached to the tube propulsion guide structure, the step surface 13a is formed in the direction of the vertical line T passing through the center of the sheath tube P ′ as shown in FIG. It is provided so that 13a faces. That is, it is provided so that the stepped surface 13a faces the side of the inner peripheral surface of the sheath P 'that has the lowest position. As a result, the deposit M peeled off by the sponge-like material 11a ′ can be dropped toward the lowest position on the inner peripheral surface of the sheath tube P ′, and the deposit M becomes the roller 10 of the subsequent tube P. Can be prevented from remaining on the orbit, and resistance to subsequent movement of the tube P can be prevented.

  When the brush 11b is used as the cleaning member 11, as shown in FIG. 4A, a gripping portion of the brush 11b is attached between the tube P and the roller 10 in the same manner as the sponge-like material 11a. The brush 11b is attached so as to contact the rolling surface of the roller 10. Thereby, the deposit M (not shown in FIG. 4 (a)) can be dropped off in the direction opposite to the traveling direction of the pipe P.

  Further, when using the blade 11c as the cleaning member 11, as shown in FIG. 4B, the blade 11c is fixed to the tube propulsion guide 7 and is placed on the rolling surface of the roller 10 on the opposite side to the traveling direction of the tube P. Align the cutting edge of the blade 11c. Thereby, the deposit M (not shown in FIG. 4B) can be dropped to the opposite side of the direction of travel of the pipe P.

Next, the operation of the cleaning member 11 when the sponge-like material 11a is used as the cleaning member 11 will be described.
First, when the tube propulsion guide 7 moves on the mortar lining Q ′ of the sheath tube P ′, the mortar lining Q ′ is peeled off and adheres to the rolling surface of the roller 10 as shown in FIG. As shown in FIG. 5A, the deposit M moves upward as the roller 10 rotates, and hits the sponge 11a as shown in FIG. 5B. As shown in FIG. 5C, the adhering matter M is peeled off from the roller 10 by the sponge-like material 11a and falls downward. Since the position where the deposit M falls is behind the direction of travel of the pipe P, the movement of the pipe P is not affected.

  By providing the pipe propulsion guide structure according to the present invention in the pipe P, the pipe P can be inserted into the sheath P 'more smoothly, and the pipe P can be pushed into the sheath P'. It becomes easier and a more efficient pipe propulsion method can be performed.

Front view showing an example of the pipe propulsion method according to the present invention AA cross-sectional view of FIG. Partial enlarged sectional view of FIG. BB sectional view of FIG. (A) Front view showing example of sponge-like material as cleaning member, (b) CC sectional view of (a) (A) Front view showing another example of a sponge-like material as a cleaning member, (b) A perspective view when the adhesion exclusion portion of (a) is directed upward, and (c) A state where (a) is attached Cross section (A) (b) Sectional drawing which shows the case where another cleaning member is used (A)-(c) Action | operation figure which shows the effect | action of the cleaning member concerning this invention Schematic diagram showing an example of pipe propulsion method Partial sectional view showing an example of a connecting portion of a pipe having a conventional pipe propulsion guide structure (A)-(d) The operation | movement figure which shows the effect | action of the conventional pipe | tube propulsion guide structure

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Insert port 2 Receiving port 3 Protrusion 4 Centering rubber 5 Lock ring 6 Sealing rubber wheel 7 Pipe propulsion guide 8 Propulsion force transmission material 9 Back end 10 Roller 11 Cleaning member 11a, 11a 'Sponge-like object 11b Brush 11c Cutlery 12 Through-hole 13 Adhesion exclusion part 13a Step surface

B Push angle J Hydraulic jack H Reaction force receiver K Leading sled L Expansion allowance L1 Shrinkage allowance L2 Disengage allowance M Separation object P Pipe P 'Sheath pipe Q' Mortar lining S Start pit R Arrival mine

Claims (2)

Used in the propulsion method of inserting a pipe (P) into the receptacle (2) of the preceding pipe (P) by inserting the insertion opening (1) of the pipe (P) and establishing a new pipe line in the sheath pipe (P ′). In the tube propulsion guide structure having the roller (10) provided on the outer peripheral surface of the tube (P),
Provided with a cleaning member (11) for peeling off the adhering matter adhering to the rolling surface of the roller (10) and dropping it on the opposite side to the traveling direction of the pipe (P) ;
The cleaning member (11) is between the pipe (P) and the roller (10), between the bent part of the divided piece of the pipe propelling guide (7) and the bent part of the adjacent divided piece, and It is attached between the tube (P) and the roller (10) so as to be in contact with the rolling surface of the roller (10),
A through hole (12) is provided in the cleaning member (11), and the cleaning member (11) is passed through a fixing member that connects the divided piece of the tube propulsion guide (7) and the adjacent divided piece to the through hole (12). 11) A tube propulsion guide structure characterized by fixing .   A pipe propulsion method using a pipe (P) having the pipe propulsion guide structure according to claim 1.

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