JP6713654B2 - Method for rehabilitating pipelines and truck for laying laying materials - Google Patents

Description

The present invention provides a method of rehabilitating a pipe for rehabilitating an existing pipe by installing a new pipe inside an existing pipe of an aging water supply/sewerage/agricultural waterway, etc., and a tubular friction reduction used for this method. The present invention relates to a truck for laying a laying object for laying a laying object such as a member in an existing pipe.

Existing pipes such as water and sewage/agricultural waterways are deteriorated with the passage of time, and irregularities are generated in the pipes, and hydraulic characteristics (friction characteristics of running water in the pipeline, flow velocity, etc.) are reduced. .. If this hydraulic characteristic deteriorates, there may occur a problem such as a decrease in the flow rate in the pipeline. Therefore, the existing pipe is regularly rehabilitated (repair work) to prevent the problem.

As one of the rehabilitation works, there is a method of constructing a new pipe in the existing pipe (pipe-in-pipe method). In this construction method, new pipes are inserted one by one from one end side of the existing pipe to be rehabilitated, and the new pipes are sequentially connected in the existing pipe. In this method, it is preferable to insert a new pipe having a diameter as large as possible into the existing pipe in order to secure a predetermined flow rate after rehabilitation. When the new pipe has a large diameter, it is difficult to place the new pipe on the carriage and convey it inside the existing pipe. Therefore, it is necessary to insert the new pipe into the existing pipe by dragging. Therefore, a large friction may occur between the inner peripheral surface of the existing pipe and the outer peripheral surface of the new pipe, which may cause a problem that the insertion work of the new pipe cannot be performed smoothly.

In order to solve this problem, for example, in the method according to Patent Document 1, a plate-shaped body having a small surface friction resistance is laid on the bottom surface of an existing pipe, and a new insertion pipe (new pipe) is slid on the plate-shaped body. The new insertion pipe is smoothly inserted into the existing pipe by moving it.

JP-A-2-225891

In the method according to Patent Document 1, it is necessary to spread the plate-like body on the bottom surface of the existing pipe before inserting the new insertion pipe, and further, to prevent the plate-like body from being displaced when the new insertion pipe is inserted. Since it is necessary to fix the existing pipe and the plate-shaped body and the plate-shaped bodies together, the pre-operation before the insertion of the new insertion pipe becomes very complicated, and this method is actually adopted. Has the problem of being difficult.

Therefore, an object of the present invention is to smoothly insert a new pipe into the existing pipe during rehabilitation work of the existing pipe.

In order to solve the above-mentioned problems, the present invention provides a tubular friction reducing member having an inner surface having a friction coefficient smaller than that of the inner surface of the existing pipe inside the existing pipe, in the pipe axial direction of 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 insertion process of the new pipe, the friction reducing member is laid inside the existing pipe in advance, and the friction reducing member prevents the existing pipe and the new pipe from directly contacting each other. The insertion work of the new pipe inside can be done smoothly. Further, since the friction reducing member has a tubular shape and the new pipe is inserted through the tubular member, contact between the existing pipe and the new pipe can be reliably prevented.

In the above configuration, before the step of passing the new pipe, the friction reducing member is passed through the inside of the friction reducing member so as to decrease in diameter toward the tip in the traveling direction, and the friction reducing member is deployed outward in the radial direction of the pipe axis. It is preferable that the configuration further includes steps. Thus, by inserting the friction reducing member in advance with the expanding member before passing the new pipe through the friction reducing member, the insertion work of the new pipe can be performed more smoothly.

In the above configuration, it is preferable that the friction reducing member is laid inside the existing pipe in a state of being folded along a fold line along the pipe axis direction of the existing pipe. By folding the friction reducing member in this manner, it is possible to prevent the friction reducing member from expanding and twisting when the friction reducing member is laid inside the existing pipe. Smoothness can be secured.

In each of the above configurations, it is preferable that the friction reducing member is made of a non-woven fabric. The thickness of the non-woven fabric can be easily changed in the manufacturing process, and the thickness of the non-woven fabric is adjusted to the optimum thickness so that the friction with the existing pipe can be sufficiently reduced in accordance with the standards such as the weight of the new pipe to be passed through. The thing can be selected suitably.

Further, in order to solve the above-mentioned problems, the present invention lays a bogie main body capable of traveling inside the existing pipe along the pipe axial direction and the existing pipe provided on the rear side of the bogie main body. A trolley for laying a laying object is provided, which includes a locking member for locking the laying object.

As described above, by using the trolley for laying the laying object in the existing pipe, the laying work can be smoothly performed without twisting the laying object.

In the configuration of the trolley for laying, the locking member includes a horizontally arranged folding shaft that is wound around a folded end portion of the laying structure, and a pair of holding bodies that sandwich the folded laying structure from above and below. And a fixing member for fixing the sandwiching body in a state where the laying object is sandwiched. In this way, while folding the laying body with the folding shaft, by sandwiching the folded back end portion with the pair of holding bodies, while maintaining the horizontal state of the folded end portion of the laying material, without causing twisting, It can be laid inside an existing pipe.

Further, in each construction of the trolley for laying, a front wheel having casters arranged at a lower center of a front side of the trolley body and a rear lower portion of the trolley body on the left and right with respect to a traveling direction in the trolley direction. It is preferable to further include a pair of symmetrically arranged rear wheels. By arranging the front wheel and the pair of rear wheels in this way, the running stability of the laying truck that runs inside the existing pipe can be maintained by the pair of rear wheels even if the laying truck tilts along the inner surface of the pipe body. It is possible to quickly return the laying vehicle to the horizontal state by the casters of the front wheels while ensuring the above. Therefore, it is possible to maintain the horizontal state of the laid object laid by the trolley for laying and prevent the twisting during the laying work.

Further, in each configuration of the trolley for laying, 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 reducing member is folded along a fold line along the tube axis direction of the tube. This laying object is used for a method of 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. By laying the friction reducing member folded as described above in this trolley for installation, it is possible to prevent the friction reducing member from being twisted during the laying work, and to insert a new pipe into this friction reducing member. The smoothness of can be secured.

In the existing pipe rehabilitation method according to the present invention, a tubular friction reducing member having an inner surface having a friction coefficient smaller than the friction coefficient of the inner surface of the existing pipe is provided in the existing pipe in the pipe axial direction of the existing pipe. A configuration including a step of laying along the pipe and a step of passing a new pipe having an outer diameter smaller than the inner diameter of the existing pipe into the friction reducing member expanded by the expanding member is adopted. In this way, before the insertion process of the new pipe, the friction reducing member is laid inside the existing pipe in advance, and the friction reducing member prevents the existing pipe and the new pipe from directly contacting each other. The insertion work of the new pipe inside can be done smoothly. Further, since the friction reducing member has a tubular shape and the new pipe is inserted through the tubular member, contact between the existing pipe and the new pipe can be reliably prevented.

Further, in the trolley for laying a laid object according to the present invention, the trolley main body is capable of traveling inside the existing pipe along the pipe axis direction, and is laid inside the existing pipe provided on the rear side of the trolley main body. A configuration including a locking member that locks the laid object is adopted. As described above, by using the trolley for laying the laying object in the existing pipe, the laying work can be smoothly performed without twisting the laying object.

In the existing pipe rehabilitation method according to the present invention, a vertical cross-sectional view showing a state in which a new pipe is being inserted into the existing pipe via a friction reducing member. 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 deployment member is shown, (a) is a side view, (b) is a front view, (c) is a perspective view. Perspective view showing the connection between the new pipe and the deployment member The longitudinal cross-sectional view of a friction reduction member is shown, (a) is in the state where it was folded, (b) is the state where the expansion member (the tip part) is inserted in it, (c) is the new pipe inserted in the inside. State It is a longitudinal cross-sectional view which shows the flow of the rehabilitation method which concerns on this invention, (a) is the state which the expansion member and the 1st new pipe were inserted in the existing pipe, (b) is the 2nd new pipe connected. State, (c) shows a state where the second new pipe is inserted, and (d) shows a 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 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. 8 is a perspective view of the trolley for installation shown in FIG.

In the method for rehabilitating an existing pipe according to the present invention, FIG. 1 is a longitudinal sectional view showing a state where a new pipe 11 is being inserted into an existing pipe 10. The method of rehabilitating the existing pipe 10 mainly 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.

The laying step is a step of laying the friction reducing member 12 inside the existing pipe 10 along the pipe axial direction of the existing pipe 10. Here, as the friction reducing member 12, a tubular non-woven fabric having elasticity (elongation rate of 3 to 5%) in the circumferential direction is adopted. 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. Therefore, the new pipe 11 can be smoothly inserted into the existing pipe 10 via the friction reducing member 12.

Further, 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. It can be stretched to some extent. Therefore, it is possible to prevent the friction reducing member 12 from being forcibly stretched and damaged locally when the new pipe 11 passes through the curved pipe portion and the stepped portion. The layer structure of the friction reducing member 12 is an example, and the friction reducing members 12 having different layer structures can be appropriately used.

When the friction reducing member 12 is laid inside the existing pipe 10 in this laying step, the friction reducing member 12 is in a state of being folded along a fold 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 manner, it is possible to prevent the friction reducing member 12 from expanding in the existing pipe 10 and twisting in this laying process, and the inserting process of the new pipe 11 described later. Thus, the new pipe 11 can be smoothly inserted into the friction reducing member 12.

The expansion step is a step of expanding the friction reducing member 12 radially outward of the tube axis by passing the expansion member 13 into the friction reducing member 12, the diameter of which is reduced toward the front end in the traveling direction. The deploying member 13 used in this deploying step is shown in FIGS. 2 and 3. The deploying member 13 has a tip portion 13a, a base portion 13b, and a connecting portion 13c.

The front end portion 13a is a trapezoidal member in side view, the diameter of which is reduced toward the front end in the traveling direction of the deployment member 13. The outer diameter of the large diameter side of the tip portion 13a is the same as the outer diameter of the new pipe 11. The base portion 13b is an annular member, and its outer diameter is substantially the same as the inner diameter of the new pipe 11. The connecting portions 13c are rod-shaped members that connect the tip portion 13a and the base portion 13b, and four connecting portions 13c are provided on the annular base portion 13b at 90-degree intervals. As shown in FIG. 4, the deploying member 13 is fitted into the tip of the new pipe 11.

The deploying member 13 shown in FIG. 2 and the deploying member 13 shown in FIG. 3 have different tip portions 13a in shape (inclination angle and axial length), but have the same basic configuration. .. The shape of the tip portion 13a can be appropriately changed 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 inserting step is a step of passing a new pipe 11 having an outer diameter smaller than the inner diameter of the existing pipe 10 into the friction reducing member 12 expanded by the expanding member 13. As shown in FIG. 4, the expansion member 13 is fitted to the tip of the new pipe 11, and the expansion member 13 and the new pipe 11 are integrated to expand the friction reducing member 12. Work efficiency is high because the insertion process of the integrated new pipe 11 can be continuously performed.

As shown in FIG. 1, a propulsion unit 14 for pushing the new pipe 11 into the existing pipe 10 is arranged on the rear end side of the existing pipe 10. A rod-shaped casing 14b that is axially movable back and forth by a hydraulic unit (not shown) is inserted into the main body 14a of the propulsion unit 14. The tip of the casing 14b is in contact with a disc-shaped cap 15 fitted to the rear end of the new pipe 11. When the hydraulic unit is driven to move the casing 14b forward, 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 the wire is wound from the arrival side of the existing pipe 10 by a winding means such as a winch. Alternatively, a method of pulling the new pipe 11 into the existing pipe 10 can be adopted.

As shown in FIG. 5A, the friction reducing member 12 laid inside the existing pipe 10 is folded along a fold line along the pipe axis direction of the existing pipe 10 (in this figure, it is folded in two). Has become. When the tip portion 13a of the expanding member 13 is inserted into the folded friction reducing member 12 as shown in FIG. 5B, the friction reducing member 12 starts to expand upward. Further, as shown in FIG. 5( c ), when the new pipe 11 integrated with the expanding member 13 is inserted into the friction reducing member 12, the friction reducing member 12 is completely expanded. In this embodiment, although 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. 5(c)), the new pipe 11 with a larger diameter is used. It is also possible to adopt a configuration in which no gap is created between the two.

In order to smoothly deploy the friction reducing member 12, the diameter of the tubular friction reducing member 12 should be 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 adopted as the material of the friction reducing member 12 as in this embodiment, the diameter may be slightly outside the above range.

FIG. 6 shows a flow of a method for rehabilitating the existing pipe 10 according to the present invention. First, a tubular friction reducing member 12 folded along a fold line along the pipe axis direction of the existing pipe 10 is laid inside the existing pipe 10 over the entire range to be rehabilitated by the new pipe 11. Next, the deploying member 13 is installed at the front end, and the first new pipe 11 (11a) in which the disc-shaped 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 wrap the end of the existing pipe 10, and the folded portion is fixed to the end of the existing pipe 10 by an annular fastener 16. .. This fixing can 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). At the same time as this insertion, the friction reducing member 12 on the tip side of the expanding member 13 is expanded, 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 at the rear end of the new pipe 11 (11a), and the new pipe 11 ( 11a) Attach the locking member 17 to the outer peripheral portion of the rear end.

As shown in FIG. 7, the locking member 17 is formed by connecting two semicircular split annular members 17a, 17a in the circumferential direction with a connecting member 17b such as a bolt. The locking member 17 abuts on the end face of the existing pipe 10 on the starting 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, both new pipes 11, It has a function as a stopper for preventing the newly inserted new pipe 11 from sliding along the pipe axis when the new pipe 11 is abutted. By attaching the locking member 17 and preventing the new pipe 11 already inserted into the existing pipe 10 from sliding, the two new pipes 11 and 11 can be connected smoothly. 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 new pipe 11 (11a) is removed. 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 inside the existing pipe 10, the casing 14b is retracted. Then, the cap 15 fitted to the rear end of the second newly installed pipe 11 (11b) is removed, and the locking member 17 is attached to the rear end outer peripheral portion of the second newly installed 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 new pipe 11 (11b) is removed. The cap 15 is fitted into the rear end of the new pipe 11 (11c) (see FIG. 6D). After this, by repeating the work of connecting the new pipe 11 (11a, 11b, 11c) and inserting it into the existing pipe 10, the entire predetermined area of the existing pipe 10 is replaced by the new pipe 11 (11a, 11b, 11c). Can be rehabilitated.

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

The trolley body 21 is configured to be able to travel inside the existing pipe 10 in the pipe axis direction. A front wheel 23 provided with casters is provided on the lower center of the front side of the carriage main body 21, and a pair of rear wheels 24, 24 are provided on the lower rear side of the carriage main body 21 symmetrically with respect to the traveling direction of the carriage main body 21. Are arranged respectively. The rear wheel is fixed to the carriage main body in a state of being inclined along 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 truck 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 It is possible to quickly return the laying vehicle 20 to the horizontal state by the casters of the front wheels 23 while ensuring the traveling stability of the laying vehicle 20.

A hook portion 25 is provided at the frontmost end of the trolley body 21. 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 carriage main body 21 can be moved forward.

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

The laying object 12 is folded back so as to be wound around the folding shaft 22a. The folded-back end portion is sandwiched by the pair of sandwiching bodies 22b, 22b from above and below. By tightening the bolts 22c provided on the sandwiching body 22b, the laying object 12 is locked to the trolley body 21 while keeping the horizontal state. In this way, by winding the laying object 12 around the folding shaft 22a and folding it back, it is possible to prevent the laying material 12 from falling off the carriage main body 21. Further, since the laying object 12 is kept horizontal, it is possible to prevent the laying object 12 from being twisted during the laying operation of the laying object 12. It should be noted that the folding shaft 22a is not an essential component, and the folding shaft 22a can be omitted if it is possible to reliably prevent the laying object 12 from falling off during the laying work by being sandwiched by the sandwiching body 22b.

The trolley 20 for laying is particularly interposed between the existing pipe 10 and a new pipe 11 provided inside the existing pipe 10 to reduce the friction between the two pipes 10, 11 and reduce the friction. Suitable for laying. This is because the new pipe 11 is inserted into the friction reducing member 12 after the installation, and in order to smoothly insert the pipe 11, it is necessary to prevent twisting when the friction reducing member 12 is installed. is there. By using the laying truck 20 according to the present invention, the friction reducing member 12 is laid inside the existing pipe 10 while keeping its horizontal state, and it is possible to prevent twisting during the laying work.

In particular, when the friction reducing member 12 is folded along a fold line along the pipe axis direction of the existing pipe 10, the friction reducing member 12 that has been folded once easily spreads during the laying work, but the laying truck 20 is used for the laying work. By doing so, it is possible to prevent the folded friction reducing member 12 from expanding or twisting. Therefore, 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 when rehabilitating the existing pipe 10, a new installation is required inside the existing pipe 10. As long as the problem of smoothly inserting the pipe 11 can be solved, another step is added to the method for rehabilitating 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 acceptable to do.

10 Existing pipe 11 (11a, 11b, 11c) New pipe 12 Friction reducing member (laying object)
13 Deployment member 13a Tip part 13b Base part 13c Connecting part 14 Propulsion machine 14a Main body part 14b Casing 15 Cap 16 Fastener 17 Locking member 17a Split annular member 17b Connecting member 20 Laying trolley 21 Bogie main body 22 Locking member 22a Folding shaft 22b Clamp 22c Fixing member (bolt)
23 front wheel 24 rear wheel 25 hook part

Claims (6)

A tubular friction reducing member (12) having an inner surface having a friction coefficient smaller than that of the inner surface of the existing pipe (10) is provided inside the existing pipe (10) in the pipe axial direction of the existing pipe (10). The process of laying along
Passing a new pipe (11) having an outer diameter smaller than the inner diameter of the existing pipe (10) through the friction reducing member (12);
Equipped with
The friction reducing member (12) is configured to be able to travel inside the existing pipe (10) in the pipe axial direction in a state of being folded along a fold line along the pipe axial direction of the existing pipe (10). The existing pipe is locked by the locking member (22) of the trolley for installation (20) including a trolley body (21) and a locking member (22) provided on the rear side of the trolley body (21). (10) is laid in
A method of rehabilitating an existing pipe (10), wherein a gap is created between the inner surface of the existing pipe (10) and the friction reducing member (12) laid and deployed in the existing pipe (10) . Before the step of passing the new pipe (11), the friction reducing member (12) is passed through the expansion member (13) having a diameter reduced toward the tip 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 expanding outward in the radial direction. The method for rehabilitating an existing pipe according to claim 1 or 2 , wherein the friction reducing member (12) is made of a non-woven fabric. A carriage main body (21) capable of traveling inside the existing pipe (10) along the pipe axis direction;
A locking member (22) provided on the rear side of the carriage body (21) for locking a laying object (12) laid inside the existing pipe (10);
Equipped with
The locking member (22) is a horizontally arranged folding shaft (22a) wound around the folded end of the laying body (12), and a pair of vertically sandwiching the folded laying structure (12). A trolley for laying a laying object, comprising a holding body (22b, 22b) and a fixing member (22c) for fixing the holding body (22b) in a state where the laying object (12) is sandwiched . A front wheel (23) provided with casters arranged in the lower center of the front side of the carriage body (21) and a rear lower part of the carriage body (21) on the left and right with respect to the traveling direction of the carriage body (21). The trolley for laying a laying material according to claim 4 , further comprising a pair of symmetrically arranged rear wheels (24, 24). The laid object (12) is interposed between the existing pipe (10) and a new pipe (11) provided inside the existing pipe (10) to prevent friction between the pipes (10, 11). The trolley for laying a laying material according to claim 4 or 5 , which is a friction reducing member (12) folded at a fold line along the pipe axis direction of the existing pipe (10) to be reduced.

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