JP2017150628A - Pipe conduit regeneration method and truck for installation of object to be laid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide constitution of smoothly inserting a new pipe into an existing pipe, in regeneration work for the existing pipe.SOLUTION: A pipe conduit regeneration method includes the steps of: laying along a pipe axial direction of an existing pipe 10 a cylindrical friction reduction member 12 having an inner surface with a smaller friction coefficient than a friction coefficient of an inner surface of the existing pipe 10, inside the existing pipe 10; and inserting a new pipe 11 with a smaller diameter than an inner diameter of the existing pipe 10 into the friction reduction member 12. A truck for installation of an object to be laid includes: a truck body capable of traveling the inside of the existing pipe 10 along the pipe axial direction; and a locking member provided on a rear side of the truck body, and configured to lock an object 12 to be laid installed in the existing pipe 10.SELECTED DRAWING: Figure 1

Description

  The present invention provides a pipe rehabilitation method for renewing an existing pipe inside an existing pipe such as an aged water and sewage / agricultural water channel, and a cylindrical friction reduction used for this rehabilitation method. The present invention relates to a cart for laying a laying material for laying a laying material such as a member in an existing pipe.

  Existing pipes such as water and sewage / agricultural waterways become obsolete with the passage of time, causing irregularities in the pipes and reducing hydraulic characteristics (friction characteristics of flowing water, flow velocity, etc.). . If this hydraulic characteristic deteriorates, problems such as a decrease in the flow rate in the pipeline may occur, so the existing pipes are periodically rehabilitated (restoration work) to prevent such problems.

  As one of the rehabilitation works, there is a construction method (pipe-in-pipe construction method) in which new pipes are installed in existing pipes. In this method, new pipes are inserted one by one from one end of the existing pipe to be rehabilitated, and the new pipes are sequentially connected in the existing pipe. In this construction method, in order to ensure a predetermined flow rate after rehabilitation, it is preferable to insert a new pipe having a diameter as large as possible into the existing pipe. When the new pipe has a large diameter, it becomes difficult to place the new pipe on the carriage and transport the existing pipe in the existing pipe. Therefore, it is necessary to drag the new pipe into the existing pipe. For this reason, a big friction arises between the internal peripheral surface of an existing pipe, and the outer peripheral surface of a new pipe, and the problem that the insertion operation of a new pipe cannot be performed smoothly may arise.

  In order to solve this problem, for example, in the method according to Patent Document 1, a plate-like body with low surface friction resistance is laid on the bottom surface of an existing pipe, and a new insertion pipe (new pipe) is slid over the plate-like body. By moving and moving, the new insertion tube is smoothly inserted into the existing tube.

Japanese Patent Laid-Open No. 2225891

  In the method according to Patent Document 1, it is necessary to spread a plate-like body on the bottom surface of the existing pipe before inserting the new insertion pipe, and the plate-like body does not shift when the new insertion pipe is inserted. Since it is necessary to fix between the existing pipe and the plate-like body and between the plate-like bodies, the preliminary work before insertion of the new insertion pipe becomes very complicated, and this method is actually adopted. There is a problem that is difficult.

  Therefore, an object of the present invention is to smoothly insert a new pipe into the existing pipe when the existing pipe is renovated.

  In order to solve the above-described problems, the present invention provides a cylindrical friction reducing member having an inner surface with a friction coefficient smaller than the friction coefficient of the inner surface of the existing pipe inside the existing pipe. And a step of passing a new pipe having an outer diameter smaller than the inner diameter of the existing pipe through the friction reducing member.

  In this way, before the process of inserting the new pipe, the friction reducing member is laid in the existing pipe in advance, and the existing pipe and the new pipe are prevented from coming into direct contact by the friction reducing member. The insertion work of the new pipe inside can be performed smoothly. In addition, since the friction reducing member has a cylindrical shape and a new pipe is passed through the friction reducing member, contact between the existing pipe and the new pipe can be reliably prevented.

  In the above-described configuration, before the step of passing the new pipe, the friction reducing member is deployed outwardly in the radial direction of the pipe shaft through a deployment member that decreases in diameter toward the distal end in the traveling direction inside the friction reducing member. It is preferable to further include a process. Thus, before the new pipe is passed through the friction reducing member, the new pipe can be inserted more smoothly by preliminarily developing the friction reducing member with the developing member.

  In the said structure, it is preferable that the said friction reduction member is set as the structure laid in the said existing pipe in the state folded by the crease line along the pipe-axis direction of the said existing pipe. Thus, by folding the friction reducing member, it is possible to prevent the friction reducing member from spreading and twisting when laying the friction reducing member in the existing pipe, and to prevent the new pipe from being inserted. Smoothness can be ensured.

  In each said structure, it is preferable to set it as the structure which the said friction reduction member consists of a nonwoven fabric. The thickness of the nonwoven fabric can be easily changed in the manufacturing process, and the optimum thickness is set so that the friction between the existing pipe and the existing pipe can be sufficiently reduced in accordance with the standards such as the weight of the new pipe passed through. A thing can be selected suitably.

  In order to solve the above-mentioned problem, the present invention lays the inside of an existing pipe in the existing pipe provided on the rear side of the carriage main body that can travel along the pipe axis direction. The trolley | bogie for laying of an installation provided with the latching member which latches an installation thing was comprised.

  Thus, by laying a laying object in an existing pipe, the laying operation can be performed smoothly without causing twisting of the laying object by using the trolley for laying.

  In the construction of the trolley for laying, the locking member includes a horizontally disposed folding shaft that is wound around the folded end portion of the laid object, and a pair of sandwiching bodies that sandwich the folded laid object from above and below. And a fixing member that fixes the sandwiched body in a state in which the laying object is sandwiched. In this way, the folded object is folded back by the folding shaft, and the folded end portion is sandwiched between the pair of sandwiching bodies, thereby maintaining the horizontal state of the folded end portion of the laid object without causing twisting, Can be installed in existing pipes.

  Further, in each configuration of the trolley for laying, the front wheel provided with a caster disposed in the lower central portion on the front side of the trolley body, and the rear lower portion of the trolley body on the left and right with respect to the traveling direction of the trolley direction. It is preferable to further include a pair of rear wheels arranged symmetrically. As described above, when the front wheel and the pair of rear wheels are arranged, even if the laying cart traveling in the existing pipe is inclined along the inner surface of the tubular body, the running stability of the laying cart by the pair of rear wheels. The trolley for laying can be quickly returned to the horizontal state by the casters of the front wheels while ensuring the above. For this reason, it is possible to maintain the horizontal state of the laying object to be laid with the trolley for laying and to prevent twisting during the laying work.

  Further, in each configuration of the laying carriage, the laying object is interposed between the existing pipe and a new pipe provided inside the existing pipe to reduce friction between the two pipes. It is preferable that the friction reduction member be folded along a crease line along the tube axis direction of the tube. This laying object is used in a method for rehabilitating an existing pipe, and is interposed between the existing pipe and the new pipe to reduce friction between the two pipes when the new pipe is inserted into the existing pipe. When laying the friction reducing member folded as described above with this trolley, it is possible to prevent the friction reducing member from being twisted during laying work, and to insert a new pipe into the friction reducing member. Smoothness can be ensured.

  In the existing pipe rehabilitation method according to the present invention, a cylindrical friction reducing member having an inner surface with a friction coefficient smaller than the friction coefficient of the inner surface of the existing pipe is provided in the pipe axial direction of the existing pipe. A configuration including a step of laying along a line and a step of passing a new pipe having an outer diameter smaller than the inner diameter of the existing pipe through the friction reducing member developed by the development member is adopted. In this way, before the process of inserting the new pipe, the friction reducing member is laid in the existing pipe in advance, and the existing pipe and the new pipe are prevented from coming into direct contact by the friction reducing member. The insertion work of the new pipe inside can be performed smoothly. In addition, since the friction reducing member has a cylindrical shape and a new pipe is passed through the friction reducing member, contact between the existing pipe and the new pipe can be reliably prevented.

  Further, in the trolley for laying objects according to the present invention, the trolley body that can travel along the pipe axis direction inside the existing pipe, and the existing pipe provided on the rear side of the trolley body. The structure provided with the locking member which locks a laying thing was employ | adopted. Thus, by laying a laying object in an existing pipe, the laying operation can be performed smoothly without causing twisting of the laying object by using the trolley for laying.

The longitudinal cross-sectional view which shows the state which is inserting the new installation pipe through the friction reduction member in the existing pipe in the rehabilitation method of the existing pipe which concerns on this invention An example of a deployment member is shown, (a) is a side view, (b) is a front view, and (c) is a perspective view. The other example of a expansion | deployment member is shown, (a) is a side view, (b) is a front view, (c) is a perspective view. The perspective view which shows the connection state of a newly installed pipe and an expansion | deployment member The longitudinal cross-sectional view of a friction reducing member is shown, (a) is a folded state, (b) is a state where a deployment member (the tip portion) is inserted therein, and (c) is a newly installed tube inserted therein. State It is a longitudinal cross-sectional view which shows the flow of the rehabilitation method which concerns on this invention, Comprising: (a) is the state in which the expansion | deployment member and the 1st new pipe were inserted in the existing pipe, (b) is the 2nd new pipe connected. (C) is the state where the second new pipe is inserted, (d) is the state where the third new pipe is connected The locking member used in the rehabilitation method shown in FIG. 6 is shown, (a) is a side view, (b) is a front view. The trolley | bogie for laying of the laying thing which concerns on this invention is shown, (a) is a top view, (b) is a side view, (c) is a front view. The perspective view of the trolley | bogie for laying shown in FIG.

  FIG. 1 shows a longitudinal sectional view of a state where a new pipe 11 is being inserted into an existing pipe 10 in the existing pipe rehabilitation method according to the present invention. The rehabilitation method for the existing pipe 10 includes a laying process of the friction reducing member 12, a developing process of the friction reducing member 12, and an inserting process of the new pipe 11 as main components.

  The laying step is a step of laying the friction reducing member 12 along the pipe axis direction of the existing pipe 10 inside the existing pipe 10. Here, as the friction reducing member 12, a cylindrical nonwoven fabric having stretchability (elongation rate 3 to 5%) in the circumferential direction is employed. The friction coefficient of the inner surface of the friction reducing member 12 is smaller than the friction coefficient of the inner surface of the existing pipe 10. For this reason, the new pipe 11 can be smoothly inserted into the existing pipe 10 via the friction reducing member 12.

  For example, when the friction reducing member 12 having an outer diameter of 580 mm is used for the existing pipe 10 having an inner diameter of 600 mm, the friction reducing member 12 is 3% in the circumferential direction along the inner diameter of the existing pipe 10. Can be stretched to some extent. For this reason, it is possible to prevent the friction reducing member 12 from being forcibly stretched locally and damaged when the new pipe 11 passes through the curved pipe part or the step part. The layer structure of the friction reducing member 12 is an example, and the friction reducing member 12 having a different layer structure can be appropriately employed.

  When the friction reducing member 12 is laid in the existing pipe 10 in this laying step, the friction reducing member 12 is folded along a crease line along the pipe axis direction of the existing pipe 10 (described later). (See FIG. 5 (a)). By folding the friction reducing member 12 in this way, it is possible to prevent the friction reducing member 12 from expanding in the existing pipe 10 in this laying process and causing twisting, and a process for inserting the new pipe 11 to be described later. Thus, the new pipe 11 can be smoothly inserted into the friction reducing member 12.

  The unfolding step is a step of unfolding the friction reducing member 12 outwardly in the radial direction of the pipe shaft through the unfolding member 13 having a diameter reduced toward the distal end in the traveling direction. A deployment member 13 used in this deployment process is shown in FIGS. The deployment member 13 has a tip portion 13a, a base portion 13b, and a connecting portion 13c.

  The distal end portion 13 a is a trapezoidal member that is reduced in diameter toward the distal end in the traveling direction of the deployment member 13. The outer diameter of the distal end portion 13 a on the large diameter side is the same as the outer diameter of the new pipe 11. The base portion 13 b is an annular member, and the outer diameter thereof is substantially the same as the inner diameter of the new pipe 11. The connecting portion 13c is a rod-like member that connects the tip portion 13a and the base portion 13b, and four connecting portions 13c are provided on the annular base portion 13b at intervals of 90 degrees. As shown in FIG. 4, the deployment member 13 is fitted into the tip of the new pipe 11.

  The deployment member 13 shown in FIG. 2 and the deployment member 13 shown in FIG. 3 are different in shape (tilt angle and axial length) of the tip portion 13a, but the basic configuration is common. . The shape of the distal end portion 13a can be changed as appropriate in consideration of the material and thickness of the friction reducing member 12, the outer diameter of the new pipe 11, and the like as long as the friction reducing member 12 can be smoothly deployed. .

  The insertion step is a step of passing the new pipe 11 having an outer diameter smaller than the inner diameter of the existing pipe 10 through the friction reducing member 12 developed by the development member 13. As shown in FIG. 4, a deployment step of deploying the friction reducing member 12 by fitting the deployment member 13 into the tip of the new tube 11 and integrating the deployment member 13 and the new tube 11, Since the insertion process of the integrated new pipe 11 can be performed continuously, the work efficiency is high.

  As shown in FIG. 1, a propulsion device 14 for pushing the new pipe 11 into the existing pipe 10 is disposed on the rear end side of the existing pipe 10. A rod-like casing 14b that is freely advanced and retracted in the axial direction by a hydraulic unit (not shown) is inserted into the main body 14a of the propulsion unit 14. The front end of the casing 14 b is in contact with a disc-like cap 15 fitted into the rear end of the new pipe 11. When the hydraulic unit is driven to advance the casing 14b, the cap 15 is pushed forward by the casing 14b, and the new pipe 11 is inserted into the existing pipe 10. Thus, instead of the method of pushing the new pipe 11 into the existing pipe 10 from the rear end side, a wire is connected to the new pipe 11, and this wire is wound from the arrival side of the existing pipe 10 by a winding means such as a winch. It is also possible to adopt a construction method in which the new pipe 11 is drawn into the existing pipe 10.

  As shown in FIG. 5A, the friction reducing member 12 laid in the existing pipe 10 is folded at a crease line along the pipe axis direction of the existing pipe 10 (in this figure, it is folded in two). It has become. As shown in FIG. 5B, when the leading end 13a of the deployment member 13 is inserted into the folded friction reduction member 12, the friction reduction member 12 starts to expand upward. Further, as shown in FIG. 5C, when the new pipe 11 integrated with the deployment member 13 is inserted into the friction reduction member 12, the friction reduction member 12 is fully deployed. In this embodiment, there is a slight gap between the inner surface of the existing pipe 10 and the friction reducing member 12 (new pipe 11) (see FIG. 5C). It is good also as a structure which uses and does not produce a clearance gap between both.

  In order to smoothly deploy the friction reducing member 12, the diameter of the cylindrical friction reducing member 12 is slightly larger than the outer diameter of the new pipe 11 and slightly smaller than the inner diameter of the existing pipe 10. However, when a non-woven fabric having elasticity is used as the material of the friction reducing member 12 as in this embodiment, the diameter is allowed to be slightly out of the above range.

  The flow of the rehabilitation method of the existing pipe 10 according to the present invention is shown in FIG. First, a cylindrical friction reducing member 12 that is folded along a crease line along the tube axis direction of the existing pipe 10 is laid in the existing pipe 10 over the entire range to be rehabilitated by the new pipe 11. Next, the first new pipe 11 (11a) in which the deployment member 13 is fitted at the front end and the disc-like cap 15 is fitted at the rear end is installed at the start side end of the new pipe 11 (11a) of the existing pipe 10. To do. The start side end of the friction reducing member 12 is folded outward so as to wind the end of the existing pipe 10, and the folded part is fixed to the end of the existing pipe 10 by an annular fastener 16. . By this fixing, it is possible to prevent the friction reducing member 12 from being drawn into the existing pipe 10 when the new pipe 11 is inserted.

  When the hydraulic unit of the propulsion unit 14 is driven, the new pipe 11 (11a) can be inserted into the existing pipe 10 (see FIG. 6A). Simultaneously with this insertion, the friction reducing member 12 on the distal end side of the deployment member 13 is deployed, so that the new pipe 11 (11a) can be smoothly inserted. When the first new pipe 11 (11a) is inserted into the existing pipe 10, the casing 14b is retracted to remove the cap 15 fitted to the rear end of the new pipe 11 (11a), and the new pipe 11 ( 11a) A locking member 17 is attached to the outer periphery of the rear end.

  As shown in FIG. 7, the locking member 17 is formed by connecting two semicircular divided annular members 17a and 17a in the circumferential direction by connecting members 17b such as bolts. The locking member 17 is in contact with the end face of the existing pipe 10 on the start side of the new pipe 11, and when the new pipe 11 is further connected to the new pipe 11 already inserted into the existing pipe 10, 11 has a function as a stopper for preventing the already-inserted new pipe 11 from sliding in the pipe axis direction. By attaching the locking member 17 and preventing the new pipe 11 already inserted into the existing pipe 10 from sliding, the new pipes 11 and 11 can be connected smoothly. Note that the shape of the locking member 17 shown in FIG. 7 is merely an example, and the shape can be appropriately changed as long as the function as a stopper can be exhibited.

  When the second new pipe 11 (11b) is connected to the rear end of the first new pipe 11 (11a), the locking member 17 attached to the first new pipe 11 (11a) is removed and the second The cap 15 is fitted into the rear end of the new pipe 11 (11b) (see FIG. 6B). Then, the hydraulic unit is driven to insert the second new pipe 11 (11b) into the existing pipe 10 (see FIG. 6C).

  When the second new pipe 11 (11b) is inserted into the existing pipe 10, the casing 14b is moved backward. Then, the cap 15 fitted to the rear end of the second new pipe 11 (11b) is removed, and a locking member 17 is attached to the outer periphery of the rear end of the second new pipe 11 (11b). When the third new pipe 11 (11c) is connected to the rear end of the second new pipe 11 (11b), the locking member 17 attached to the second new pipe 11 (11b) is removed and the third The cap 15 is fitted into the rear end of the new pipe 11 (11c) (see FIG. 6D). Thereafter, by repeating the connection of the new pipe 11 (11a, 11b, 11c) and the insertion operation into the existing pipe 10, the entire predetermined area of the existing pipe 10 is replaced with the new pipe 11 (11a, 11b, 11c). Can be rehabilitated.

  8 and 9 show a trolley 20 for laying a laying object according to the present invention (hereinafter, the same reference numeral as that of the friction reducing member 12 is given). The laying cart 20 includes a cart body 21 and a locking member 22 as main components.

  The carriage main body 21 is configured to be able to travel in the pipe axis direction inside the existing pipe 10. A front wheel 23 provided with casters is provided at the lower front center of the carriage main body 21, and a pair of rear wheels 24, 24 are provided symmetrically with respect to the traveling direction of the carriage main body 21 at the lower rear side of the carriage main body 21. Are arranged respectively. The rear wheel is fixed to the carriage main body while being inclined so as to follow the surface normal of the rear wheel contact position on the inner surface of the existing pipe. By arranging the front wheel 23 and the pair of rear wheels 24, 24, even if the laying carriage 20 traveling in the existing pipe 10 is inclined along the inner surface of the existing pipe 10, the pair of rear wheels 24, 24 While securing the traveling stability of the laying cart 20, the laying cart 20 can be quickly returned to the horizontal state by the casters of the front wheels 23.

  A hook portion 25 is provided at the foremost end of the carriage main body 21. The cart body 21 can be moved forward by connecting a wire (not shown) to the hook portion 25 and winding the wire with a winding means (not shown) such as a winch.

  The locking member 22 is provided on the rear side of the carriage main body 21. This locking member 22 is for locking the laying object 12 (the friction reducing member 12 in the above-described embodiment) laid in the existing pipe 10, and is a horizontally disposed folding shaft 22a; It has a pair of clamping bodies 22b and 22b, and a bolt as the fixing member 22c (hereinafter, the same reference numeral as that of the fixing member 22c is given).

  The laying object 12 is folded so as to be wound around the folding shaft 22a. The folded end portion is sandwiched between the pair of sandwiching bodies 22b and 22b from above and below. By tightening the bolts 22c provided on the sandwiching body 22b, the laying object 12 is locked to the carriage main body 21 in a state where the laying object 12 is maintained in a horizontal state. In this way, the laying object 12 can be prevented from falling off the carriage main body 21 by winding the laying object 12 around the folding shaft 22a and turning it back. Further, by maintaining the horizontal state of the laying object 12, it is possible to prevent the laying object 12 from being twisted during the laying operation of the laying object 12. Note that the folding shaft 22a is not an essential component, and the folding shaft 22a can be omitted as long as the laying object 12 can be prevented from falling off during the laying operation by being pinched by the holding body 22b.

  In particular, the trolley 20 for laying is interposed between the existing pipe 10 and the new pipe 11 provided inside the existing pipe 10 to reduce the friction between the pipes 10 and 11. Suitable for laying. The new pipe 11 is inserted into the friction reducing member 12 after laying, and in order to smoothly perform the insertion, it is necessary to prevent the twist from occurring when the friction reducing member 12 is laid. is there. By using the laying cart 20 according to the present invention, the friction reducing member 12 can be laid in the existing pipe 10 while maintaining its horizontal state, and twisting during the laying operation can be prevented.

  In particular, when the friction reducing member 12 is folded along a crease line along the pipe axis direction of the existing pipe 10, the folded friction reducing member 12 tends to spread during the laying work. By performing the above, it is possible to prevent the folded friction reducing member 12 from expanding or twisting. For this reason, the new pipe 11 can be smoothly inserted into the friction reducing member 12.

  The method for rehabilitating the existing pipe 10 and the trolley 20 for laying the laying object 12 described in the above embodiment are merely examples, and the renewal work of the existing pipe 10 is newly installed inside the existing pipe 10. As long as the problem of smoothly inserting the pipe 11 can be solved, another process is added to the rehabilitation method of the existing pipe 10, or the shape and arrangement of the components of the laying carriage 20 of the laying object 12 are appropriately changed. It is also permissible.

10 Existing pipe 11 (11a, 11b, 11c) New pipe 12 Friction reducing member (laying object)
13 deploying member 13a tip 13b base 13c connecting part 14 propulsion unit 14a main body 14b casing 15 cap 16 fastener 17 locking member 17a split annular member 17b connecting member 20 trolley 21 truck main body 22 locking member 22a folding shaft 22b Clamping body 22c Fixing member (bolt)
23 Front wheel 24 Rear wheel 25 Hook part

Claims (8)

Inside the existing pipe (10), a cylindrical friction reducing member (12) having an inner surface with a friction coefficient smaller than the friction coefficient of the inner surface of the existing pipe (10) is arranged in the tube axis direction of the existing pipe (10). A process of laying along,
Passing the new pipe (11) having an outer diameter smaller than the inner diameter of the existing pipe (10) through the friction reducing member (12);
Rehabilitation method for existing pipes equipped with   Prior to the step of passing the new pipe (11), the friction reducing member (12) is passed through the expansion member (13) whose diameter decreases toward the front end in the traveling direction inside the friction reducing member (12). The method for rehabilitating an existing pipe according to claim 1, further comprising a step of deploying radially outward.   The existing pipe according to claim 1 or 2, wherein the friction reducing member (12) is laid in the existing pipe (10) in a state of being folded along a crease line along a pipe axis direction of the existing pipe (10). Rehabilitation method.   The method for rehabilitating an existing pipe according to any one of claims 1 to 3, wherein the friction reducing member (12) is made of a nonwoven fabric. A carriage body (21) capable of traveling along the pipe axis direction inside the existing pipe (10);
A locking member (22) for locking a laying object (12) laid in the existing pipe (10) provided on the rear side of the bogie body (21);
A trolley for laying laid objects.   The locking member (22) is a pair of horizontally disposed folding shafts (22a) wound around the folded end of the laying object (12), and a pair of the folded laying object (12) sandwiched from above and below. The laying object according to claim 5, further comprising: a sandwiching body (22b, 22b) and a fixing member (22c) that secures the sandwiching body (22b) in a state where the laying object (12) is sandwiched. Trolley.   A front wheel (23) provided with a caster disposed at the lower center of the front side of the cart body (21), and a rear lower portion of the cart body (21) are arranged laterally with respect to the traveling direction of the cart body (21). The trolley for laying objects according to claim 5 or 6, further comprising a pair of rear wheels (24, 24) arranged symmetrically.   The laying object (12) is interposed between the existing pipe (10) and a new pipe (11) provided inside the existing pipe (10), and causes friction between both pipes (10, 11). The cart for laying a laying object according to any one of claims 5 to 7, wherein the trolley is a friction reducing member (12) folded along a crease line along a pipe axis direction of the existing pipe (10).

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