JP2012047033A - Siphon pull-in device and siphon pull-in method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a siphon pull-in device and a siphon pull-in method, capable of smoothly guiding a rehabilitation pipe simply installed in a manhole from the manhole into an existing drain pipe.SOLUTION: A pull-in device for pulling in a flexible synthetic resin pipe from a manhole into an existing drain pipe connected to the manhole comprises: a body frame 2 arranged in the manhole in a manner facing to the drain pipe; guide parts 3a to 3d provided on the body frame and for guiding the synthetic resin pipe brought down into the manhole into the drain pipe; and a fixing mechanism 8 provided on the body frame so as to extend and contract and for pressing an inner wall of the manhole to releasably fix the body frame.

Description

  TECHNICAL FIELD The present invention relates to a tube drawing device used when repairing a drainage pipe such as an aging sewer pipe, and a tube drawing method using the tube drawing device.

  If the load carrying capacity and water stoppage capacity decline due to aging of sewer pipes that have been buried in the soil for a long time, there will be a problem that the road will sink or the flow capacity will be insufficient.

  As a method for solving this problem, a drainage pipe repair method for forming a new drainage pipe inside an aging sewer pipe has been proposed and implemented.

  Among the various drainage pipe repair methods, for example, in the pipe making method, a belt-like hard polyvinyl chloride material is supplied into the manhole, and the belt-like hard vinyl chloride material is tubularly formed by a pipe making machine at the inlet portion of the existing pipe. Insert into the existing pipe while forming.

  In addition, as shown in FIG. 9, a method is known in which a resin pipe having an outer diameter smaller than the inner diameter of an existing sewage pipe, a so-called rehabilitation pipe, is manufactured in advance and inserted into the sewage pipe from a manhole.

  Specifically, the flexible rehabilitation pipe 50 is fed out from the rotary drum 51 and is inserted from one of the sewage pipes 53 through the manhole 52 using the flexibility of the rehabilitation pipe 50, and the other side of the sewage pipe 53. It is a method of picking up from the winch 54 (for example, refer patent document 1).

  In the figure, 55 is a cap attached to the tip of the rehabilitation tube 50, and 56 is a wire connected to the cap 55.

JP 2002-38581 A

  According to the method of Patent Document 1, a pipe making machine is not required as in the former pipe making method, but the construction method is simplified. On the other hand, the rehabilitated pipe 50 that has already been manufactured as a tubular body is connected to the sewer pipe through the narrow manhole 52. Since it has to be pulled into 53, there is a problem that the pull-in operation is difficult.

  In order to support the retraction work of the rehabilitation pipe 50, a retraction jig 58 with a roller 57 for facilitating the retraction of the rehabilitation pipe 50 is usually fixed to the manhole 52. However, in order to install the retraction jig 58 in the manhole 52, a through hole is formed in the side wall of the manhole 52, a bolt is implanted, and the bolt is inserted into a fixing hole provided in the retraction jig 58. And fixing with a nut is required. Thus, if the drawing jig | tool 58 is used, a process will newly increase and the drawing operation of the rehabilitation pipe | tube 50 could not be performed still simply.

  The present invention has been made in view of the problems in the conventional rehabilitation pipe drawing work as described above, and can be easily installed in the manhole and smoothly guide the rehabilitation pipe from the manhole to the existing drain pipe. The object is to provide a tubular body retracting apparatus and a tubular body retracting method.

The present invention is a drawing-in device for drawing a flexible tubular body from a manhole into an existing drain pipe connected to the manhole,
A main body frame disposed toward the drain pipe in the manhole;
A guide portion provided in the main body frame for guiding the pipe body lowered into the manhole into the drain pipe;
It is a tubular body retracting device provided with a fixing mechanism which is provided on the main body frame so as to be extendable and presses an inner wall of the manhole so as to releasably fix the main body frame.

  In the present invention, as the fixing mechanism, a support body provided in the main body frame, and the manhole is expanded and contracted in the diameter direction of the manhole from the support body. It is possible to have a telescopic part that is spaced from the inner wall.

  In this invention, the said support body is arrange | positioned in the diameter direction of a manhole, As the said expansion-contraction part, the movable part which slides along the support body, and the link mechanism which has connected this movable part and the said support body Can have.

  In the present invention, the elastic component may have a ball screw that expands and contracts from the support.

  In the present invention, the guide portion may include a roller that is provided on the main body frame and rolls in contact with the upper surface of the tubular body that is lowered into the manhole.

  In the present invention, the rollers can be arranged in a plurality of stages in the tube guide direction.

  In the present invention, the guide portion may further include a plurality of rod-like members arranged in a sled shape for supporting the lower peripheral portion of the tubular body and sliding the tubular body.

In the present invention, the pipe retractor having the above-described configuration is disposed in a manhole,
The tube retractor is fixed in the manhole by the fixing mechanism,
Insert the tube from the upper opening of the manhole,
By guiding the inserted pipe body through the guide part, guiding it to the drain pipe,
It is a pipe body drawing-in method for inserting the guided pipe body into a drain pipe.

  ADVANTAGE OF THE INVENTION According to this invention, the pipe drawing apparatus and pipe drawing method which can be easily installed in a manhole, and can guide a rehabilitation pipe | tube into the drain pipe smoothly from the manhole can be provided.

It is a longitudinal cross-sectional view which shows the drain pipe structure to which the drawing-in apparatus which concerns on this invention is applied. It is a perspective view which shows the whole structure of the drawing-in apparatus of this invention. It is a front view which shows arrangement | positioning of the guide part and guide wheel of FIG. (a) is a top view of a drawing-in apparatus, (b) is a side view, (c) is a right front view. (a) is a perspective view which shows the fixation cancellation | release state of the jig fixing device provided in the drawing-in apparatus, (b) is a perspective view which shows a fixation state. It is a perspective view which shows the state which fixed the drawing-in apparatus which concerns on this invention in the manhole. It is a side view which shows 2nd Embodiment of this invention. It is a perspective view which shows 3rd Embodiment of this invention. It is explanatory drawing which shows the conventional pipe body drawing-in method.

  Hereinafter, the present invention will be described in detail based on the embodiments shown in the drawings.

1. FIG. 1 is a longitudinal sectional view showing a drain pipe structure to which a pipe retractor of the present invention (hereinafter abbreviated as a retractor) is applied.

  In the figure, a plurality of drain pipes (sewage pipes) 53 buried in the soil are usually made of concrete pipes, and each drain pipe 53 is provided below manholes 52 and 59 disposed in the drainage path. Are connected to the openings 52a and 59a, respectively.

  In the present embodiment, a case where a rehabilitation pipe as a flexible pipe body is inserted into the drainage pipe 53 aged from the left manhole 52 will be described as an example.

  When the drain pipe 53 is inspected when the drain pipe 53 is rehabilitated, first, a camera is inserted into the drain pipe 53 to investigate whether a crack has occurred. As a result of the investigation, if a crack has occurred and repair is necessary, the inside of the drain pipe 53 is washed with high-pressure washing water as preparation for repair. In the figure, reference numeral 60 denotes a stop cock for preventing washing water from entering another drain pipe.

  Next, a retractor is installed in the manhole 52 as a preparation for retracting the rehabilitation pipe.

2. Drawing Device FIG. 2 is a perspective view showing the overall configuration of the drawing device.

2.1 Main Body Frame In the figure, the retracting device 1 has a main body frame 2 formed in a window frame shape when seen from the plane. In the main body frame 2, the side arranged toward the drain pipe to be rehabilitated is called the frame front side 2a, and the opposite side is called the frame rear side 2b.

  The front plate 2c on the frame front side 2a is formed with an arc-shaped notch, and an arc-shaped flange 2d is provided along the notch. The flange portion 2d positions the retracting device 1 by partially contacting the inner wall of the drain pipe 53.

  On the left and right sides of the front plate 2c are rounded portions 2e, 2e that can extend along the peripheral surface of the inner wall of the manhole. It is like that.

  Further, a flange portion 2h is formed on the side wall of the main body frame 2, and if a bolt for height adjustment (not shown) is suspended from the flange portion 2h, the main body is set to a predetermined height from the bottom surface of the manhole 52. The frame 2 can be arranged.

2.2 Guide Part A plurality of guide parts 3a to 3d for guiding the rehabilitated pipe to the drain pipe are fixed to the frame rear side 2b. The plurality of guide portions 3a to 3d are configured by pipes (rod-like members) that are curved downward and convex, and form a “sledge” as a whole so that the rehabilitating tube can be slid by supporting the lower surface of the rehabilitating tube. It is configured.

  The rear plate 2f of the frame rear side 2b is provided with a leg portion 4a having wheels 4 (see FIG. 4B). The leg 4a is configured to swing in the direction of arrow A about a horizontal axis (not shown) provided on the rear plate 2f.

  A shaft 5 is installed in the middle of the main body frame 2 in the frame width direction, and guide wheels 5a and 5b as rollers are provided on the shaft 5 in a separated state.

  In addition, a slit 2g is provided in the frame middle portion in the vertical direction, and the shaft 5 is fixed by a nut 5c through the slit 2g. That is, if the nut 5c is loosened, the shaft 5 can be raised and lowered within the range of the length of the slit 2g, so that the distance between the guide wheels 5a and 5b and the guide portions 3a to 3d can be adjusted. It has become.

  The guide portions 3a to 3d and the guide wheels 5a and 5b function as guide portions that guide the rehabilitating pipe RP lowered into the manhole in the direction of the drain pipe.

  FIG. 3 shows the arrangement of the guide portions 3a to 3d and the guide wheels 5a and 5b from the front.

  In the same figure, each guide part 3a-3d is arranged in the circular arc so that the outer periphery lower part of the rehabilitation pipe | tube RP may be followed, On the other hand, guide wheel 5a, 5b can hold the outer periphery upper part of the rehabilitation pipe | tube RP. Arranged to be able to.

  Specifically, the guide wheels 5a and 5b are made of a Teflon (registered trademark) roller having a skirt extending in a conical shape. The guide wheels 5a and 5b are partially in contact with two places on the outer periphery of the rehabilitation pipe RP. When the water is drawn into the drain pipe 53, the rehabilitation pipe RP is prevented from rising.

  A space surrounded by the guide portions 3a to 3d and the guide wheels 5a and 5b functions as a passage for allowing the rehabilitation pipe to pass therethrough.

  4A is a plan view showing the configuration of the retractor 1, FIG. 4B is a side view thereof, and FIG. 4C is a right front view thereof.

  4A to 4C, the upper portions of the guide portions 3a to 3d are connected to each other in the frame width direction by a connection frame 6, and an arm 7 extends from the connection frame 6 toward the frame front side 2a. Yes.

  The arm 7 is composed of a pipe bent into a U shape so that the rehabilitating pipe RP can be passed between the guide portions 3a to 3d with play, and both ends 7a and 7b of the arm 7 are formed. Is pivotally supported on a horizontal shaft 9 protruding from the side walls 6a, 6b of the connection frame 6.

  Therefore, the arm 7 can swing around the horizontal axis 9.

  A retracting device fixing mechanism 8 to be described later is provided at the distal end portion 7 c of the arm 7.

  The rear plate 6c of the connection frame 6 is also provided with a rounded portion 6d so that the rear plate 6c can be brought into close contact with the side wall of the manhole.

  If one or a plurality of spacers are provided in the rounded portion 6d, the rear plate 6c can be easily brought into contact with the inner wall of the manhole.

2.3 Pull-in Device Fixing Mechanism FIG. 5 is an enlarged side view of the pull-in device fixing mechanism (hereinafter abbreviated as “fixing mechanism”) 8, and FIG. FIG. (B) shows a fixed state.

  In both figures, the fixing mechanism 8 includes an outer cylinder portion (support) 8a extending from the distal end portion 7c of the arm 7 toward the frame front side 2a, and an inner cylinder portion inserted into the outer cylinder portion 8a in a nested manner. (Movable part) 8b.

  The inner cylinder part 8b is formed longer than the outer cylinder part 8a, and even if the rehabilitation pipe RP contacts the rear part of the inner cylinder part 8b, an arc-shaped sliding plate is provided so as not to hinder the retraction operation of the rehabilitation pipe RP. 8c is attached.

  Further, a female screw part is provided at the tip of the inner cylinder part 8b, and a hexagon head bolt 8d is screwed into the female screw part. The amount of protrusion of the hexagon head bolt 8d can be adjusted by rotating the male screw portion in a tightening direction or a loosening direction. In addition, the hexagon head bolt 8d whose protrusion amount is adjusted is fixed by a nut 8e.

  Further, a movable piece 8f having a U-shaped cross section is disposed so as to cover the front end portion of the inner cylinder portion 8b from above.

  A front end portion 8g of the movable piece 8f is pivotally supported by a shaft 8h penetrating the inner cylinder portion 8b in the width direction, and a rear end portion of the movable piece 8f is attached to a side wall of the outer cylinder portion 8a via a pair of links 8j. It is connected.

  The movable piece 8f swings in the direction of arrow B with the shaft 8h as a fulcrum, the movable piece 8f and the outer cylinder portion 8a are connected via a link 8j, and the outer cylinder portion 8a is fixed. When the standing operation lever 8i is operated in the direction of arrow C, the movable piece 8f and the link 8j bent in an L shape are displaced in a substantially straight line as shown in FIG. The tube portion 8a is used as a guide and extends from the end of the outer tube 8a in the direction of arrow D.

  On the contrary, when the operation lever 8i is returned to the original posture, the movable piece 8f and the link 8j are bent in an L shape, and the inner cylindrical portion 8b is reduced with the outer cylindrical portion 8a as a guide. The movable piece 8f and the link 8j constitute a link mechanism.

  The inner cylindrical portion 8b and the movable piece 8f, the link 8j, and the operating lever 8i that move the same function as an elastic part that presses the inner wall of the manhole when extended, and separates from the inner wall of the manhole when contracted.

2.4 Rehabilitation pipe The rehabilitation pipe RP has a straight pipe part and a protrusion formed in a spiral shape on the outer wall of the straight pipe part, and the straight pipe part further includes a lower wound soft resin layer and an upper wound soft resin. And a net-like reinforcing material interposed between the two resin layers.

  The lower and upper soft resin layers can be formed from a thermoplastic resin excellent in chemical resistance, such as vinyl chloride resin, polyolefin resin, or olefin-based or styrene-based thermoplastic elastomer, etc. When the soft resin layer and the upper soft resin layer are formed into a tubular shape, they are sandwiched between the two resin layers.

  Since the mesh reinforcing material passes from one end of the rehabilitating pipe RP to the other end, it opposes the pulling in the pipe axis direction.

  Further, the protruding portion can be made of a thermoplastic resin excellent in chemical resistance, such as vinyl chloride or polyolefin resin.

  Further, the protruding portion of the rehabilitation pipe RP is not limited to a spiral shape but may be a ring shape.

3. Inlet Device Fixing Method In FIG. 6, an invert 52 b communicating with the drain pipe 53 is usually formed at the inner bottom of the manhole 52.

  A crane is used to suspend the retracting device 1 in an inclined posture and slowly descend into the manhole 52. At this time, the retracting device 1 is smoothly lowered by pulling the wheel 4 in the direction of arrow E and applying the wheel 4 to the side wall of the manhole 52.

  The retracting device 1 is matched with the direction of the invert 52b. Specifically, the front side 2a of the main body frame 2 is opposed to the drain pipe 53, and the invert 52b and the directions of the guide portions 3a to 3d are made to coincide.

  Next, the flange 2 d on the frame front side 2 a is inserted into the drain pipe 53.

  Next, the arm 7 is pulled up so as to be in a substantially horizontal posture.

  In this state, the operation lever 8i of the fixing mechanism 8 is tilted in the direction of arrow C, and as shown in FIG. 5 (b), the inner tube portion 8b is extended in the direction of arrow D using the outer tube portion 8a as a guide, and a hexagon head is attached. The bolt 8d is strongly pressed against the side wall of the manhole 52.

  Thereby, the rear plate 6 c of the connection frame 6 located on the opposite side of the fixing mechanism 8 is pressed against the side wall of the manhole 52.

  As a result, the retracting device 1 is in a stable state in the manhole 52 by the three points of the pair of rounded portions 6d (see FIG. 4A) provided on the left and right sides of the rear plate 6c and the hexagon head bolt 8d. Fixed.

4). Next, a method for retracting the rehabilitation pipe RP using the retraction apparatus 1 of the present invention will be described with reference to FIG.

  In the description, the case where the rehabilitation pipe RP is drawn into the drain pipe 53 from the manhole 52 will be described as an example.

  After the retracting device 1 is fixed to the manhole 52 by the method described above, the rehabilitation pipe RP is retracted from the upper opening of the manhole 52.

  When drawing in, the cap 10 for drawing in is attached to the front-end | tip of the rehabilitation pipe | tube RP beforehand, and the wire 11 drawn in from the manhole 59 (refer FIG. 1) of the other side shall be connected with the cap 10. FIG. The wire 11 is wound up by driving a winch (not shown) installed on the manhole 59 side.

  The tip of the rehabilitation pipe RP pulled by the wire 11 and descending in the manhole 52 is guided into a space surrounded by the guide portions 3 a to 3 d and the arm 7.

  The rehabilitation pipe RP moves along the curvature of the guide portions 3a to 3d while the lower surfaces thereof are supported by the guide portions 3a to 3d, and gradually changes its direction to the horizontal direction.

  At this time, the guide wheels 5a and 5b roll while contacting the upper surface of the rehabilitation pipe RP, and prevent the rehabilitation pipe RP from being lifted.

  Since the flange 2d on the frame front side 2a is inserted into the drain pipe 53, the rehabilitated pipe RP whose direction is changed in the horizontal direction is smoothly guided into the drain pipe 53.

  Note that when the retraction pipe RP has been retracted, the retraction device 1 can be unlocked simply by returning the operation lever 8i to the direction opposite to the arrow C direction.

5). Second Embodiment of Retraction Device According to the Present Invention FIG. 7 shows a second embodiment of the present embodiment, and shows a structure of a retraction device used in a manhole 10 having a recess 10a formed on the bottom surface.

  When viewed in plan, the lower frame 13 forms a cross shape, and a horizontal slide bolt 13b is installed on the outer peripheral edge of one end thereof, and the horizontal slide bolt makes contact with the manhole 10. Further, in order to ensure this contact, a plate-like stopper 13a is welded to the lower frame 13 on the side wall 10b of the recess 10a.

  The height of the frame 17 with the guide wheel 14 erected at the center of the lower frame 13 is adjusted via the height adjustment bolt 12. The height adjusting bolt 12 is not limited to the central portion, but is provided at a position near the opening of a drain pipe (not shown).

The plurality of outer guide portions 11 and inner guide portions 11a are configured in the form of “sledge”, as in the above-described embodiment.
Note that the outer guide portion 11 and the inner guide portion 11a are welded and fixed at a plurality of locations via the flange reinforcing plate 19, thereby achieving stability of strength.

  The flange 18 is fixed to the outer guide portion 11 and the frame 17 by welding.

  A rectangular arm 15 is fixed in the horizontal direction on top of the outer guide portion 11 and the inner guide portion 11a. A male screw portion 15b is formed at both ends, and a frame stopper 15c is connected to the male screw portion 15b via a bolt 15a. The frame stopper 15c is brought into contact with or separated from the inner side of the manhole 10 by the operation of tightening or loosening the male screw 15b. The arm 15 and the bolt 15a function as a fixing mechanism.

  The tube 16 as a tubular body is inserted from the upper part of the manhole 10 and is drawn from the opening 10c along the outer guide portion 11 and the inner guide portion 11a.

6). 6. Third Embodiment of Retracting Device According to the Present Invention 6.1 Main Body Frame A third retracting device 20 shown in FIG. 8 has a main body frame 21, and a plurality of front devices are prepared on the front side of the main body frame 21. A front plate 21a selected from the plates (supports) 21a is detachably connected.

  An arc-shaped notch 21b is formed in the lower part of the front plate 21a, and an arc-shaped flange 21c is provided along the notch 21b. The flange portion 21c positions the retracting device 20 by partially contacting the upper portion of the inner wall of the drain pipe 53 (see FIG. 1). Moreover, the cross section seen from the side surface is formed in the tip part so that the collar part 21c can guide the renovation pipe | tube RP smoothly in a drain pipe.

  By replacing the appropriate front plate 21a according to the diameter of the rehabilitation pipe RP, the rehabilitation pipe RP is smoothly brought into contact with the bottom surface of the invert and the flange 21c, and the rehabilitation pipe RP is drawn into the drain pipe with the minimum bending radius. It becomes possible.

  Flange portions 21e (only the front side is shown) are formed in the lower part of the side wall 21d of the main body frame 21, and nuts 22 are fixed to the front side and the rear side of these flange portions 21e, respectively.

  Adjuster bolts 23 are screwed onto these nuts 22, and when these adjuster bolts 23 are rotated around the vertical axis, the main body frame is horizontally and at a predetermined height from the bottom of the manhole 52 (see FIG. 1). 21 can be arranged.

  The rear part of the main body frame 21 is connected by two connecting plates 21f arranged horizontally.

  These connection plates 21f are provided with cylindrical guide portions 26a and 26b that are curved in a downward convex manner, and support the lower part of the rehabilitation pipe RP to guide it toward the drain pipe. . In addition, the guide part 26a and the guide part 26b are connected via the connection part 26c, and the guide part 26a can be removed from the guide part 26b.

  When the main body frame 21 is suspended and installed in a manhole with a sling or the like, the guide portion 26a can be removed so that the guide portion 26a does not collide with the inner wall of the manhole.

  In the figure, reference numeral 27 denotes a handle portion. When the main body frame 21 is installed in the manhole, the main body frame 21 can be easily moved by gripping the handle portion 27.

6.2 Guide Wheel A pair of brackets 21 g and 21 g are provided on the upper front side of the main body frame 21.

  A shaft 24 is installed between the two brackets 21g and 21g in the frame width direction, and guide wheels 25a and 25b serving as rollers are provided on the shaft 24 in a separated state.

  The side wall 21d of the main body frame 21 is provided with a plurality of bracket mounting holes 21h so that the bracket 21g can be moved in the vertical direction and the horizontal direction. By moving the bracket 21g in this way, the positions of the guide wheels 25a and 25b can be adjusted, and the retraction pipe RP can be retracted with a minimum bending radius and without applying an excessive load.

  The guide wheels 25a and 25b function as guide portions for guiding the rehabilitation pipe RP to the drain pipe inlet. Specifically, the guide wheels 25a and 25b are made of a Teflon (registered trademark) roller having a skirt extending in a conical shape so that the upper part of the outer periphery of the rehabilitation pipe RP partially contacts two places in the circumferential direction. It has become.

  Thus, when the rehabilitating pipe RP is drawn into the drain pipe 53, the rehabilitating pipe RP can be directed in the direction of the drain pipe in cooperation with the guide portions 26a and 26b. The guide wheels 25a and 25b The rehabilitation pipe RP is prevented from rising.

  In the above-described embodiment, one set of guide wheels is provided on the main body frame 21, but a plurality of guide wheels may be provided in the direction in which the rehabilitating pipe RP is guided.

6.3 Fixing Mechanism The fixing mechanism 28 has a pressing plate 28a that can expand and contract in the direction of arrow F or in the opposite direction.

  The pressing plate 28a can be slightly swung in the direction of arrow G around the fulcrum 28c provided on the plate 28b, and can be brought into close contact with the wall of the manhole housing.

  The plate 28b is fixed to the tips of two guide pins 28d arranged in parallel, and these guide pins 28d are slid by bearings 28e provided on the front plate 21a.

  The tip of a ball screw (expandable part) 28f is connected to the center of the plate 28b, and the operation part 28g provided at the rear end of the ball screw 28f is rotated clockwise or counterclockwise. The pressing plate 28a can be moved in the direction of arrow F or in the opposite direction.

  Further, a fixing portion 29 for fixing the rear portion of the main body frame 21 to the inner wall of the manhole is also provided in the center of the connection plate 21f connecting the rear portion of the main body frame 21.

  The fixing portion 29 includes an arc-shaped fixing plate 29a and a connection fitting 29b for connecting the fixing plate 29a to the connection plate 21f. The fixing plate 29a is a fulcrum portion 29c provided on the connection fitting 29b. It is possible to slightly swing around the vertical axis (in the direction of arrow H) via

  A level 30 is provided at the center of the upper plate 21 i provided on the front side of the main body frame 21.

6.4 Rehabilitation Pipe Retraction Next, a retraction pipe RP retraction method using the retraction device 20 will be described.

  By lowering the retracting device 20 into the manhole 52, placing the lower end of the adjuster bolt 23 on the step near the recess 10a (see FIG. 7), and rotating each adjuster bolt 23 around the vertical axis while looking at the level 30 Then, the posture of the main body frame 21 is made horizontal. At this time, the fixing plate 29 is kept in contact with the inner wall of the manhole.

  Next, by rotating the operation portion 28g clockwise, the pressing plate 28a is pressed against the inner wall of the manhole. Thereby, the main body frame 21 is fixed to the inner wall of the manhole.

  Next, the rehabilitation pipe RP is drawn from the upper opening of the manhole 52.

  The rehabilitating pipe RP pulled by the wire and descending in the manhole 52 is first supported by the guide portions 26a and 26b and directed in the direction of the drainage pipe, and then contacts the guide wheels 25a and 25b. By rolling the guide wheels 25a and 25b, the guide wheels 25a and 25b are guided into the drain pipe 53 in a state in which the lift is prevented.

  When all the retraction pipes RP have been retracted, the operation frame 28g is rotated counterclockwise to release the fixing of the main body frame 21, and the retractor 20 can be removed from the manhole.

DESCRIPTION OF SYMBOLS 1 Pulling-in apparatus 2 Main body frame 2a Frame front side 2b Frame rear side 2c Front plate 2d Ear part 2e Earl part 2f Rear plate 2g Slit 3a-3d Guide part 4 Wheel 4a Leg part 5 Shaft 5a, 5b Guide wheel 5c Nut 6 Connection frame 6a , 6b Side wall 6c Rear plate 6d Round portion 7 Arm 7a, 7b Both ends 7c Front end portion 8 Fixing mechanism 8a Outer cylinder portion 8b Inner cylinder portion 8c Sliding plate 8d Hex head bolt 8e Nut 8f Movable piece 8g Front end portion 8h Shaft 8i Operation lever 8j link

Claims (8)

A drawing device for drawing a flexible pipe body from a manhole into an existing drainage pipe connected to the manhole,
A main body frame disposed toward the drain pipe in the manhole;
A guide portion provided in the main body frame for guiding the pipe body lowered into the manhole into the drain pipe;
A tube retractor comprising: a fixing mechanism that is provided in the main body frame so as to be extendable and contractable, and presses an inner wall of the manhole to fix the main body frame releasably.   As the fixing mechanism, a support body provided on the main body frame, and when expanding or contracting from the support body in the diameter direction of the manhole, the inner wall of the manhole is pressed when it is extended, and when it contracts, it is separated from the inner wall of the manhole. The tubular body retracting apparatus according to claim 1, wherein the tubular body retracting apparatus has a telescopic part.   The support body is disposed in a diameter direction of a manhole, and has a movable part that slides along the support body as a telescopic part, and a link mechanism that connects the movable part and the support body. Item 3. A tube retractor according to Item 2.   The tubular body retracting apparatus according to claim 2, wherein the telescopic component has a ball screw that expands and contracts from the support.   3. The tube retractor according to claim 1, further comprising a roller that is provided on the main body frame and rolls in contact with an upper surface of the tube that is lowered into the manhole as the guide portion.   6. The tube body retracting apparatus according to claim 5, wherein the rollers are arranged in a plurality of stages in the tube guide direction.   3. The tubular body retracting apparatus according to claim 1, further comprising a plurality of rod-like members arranged in a sled form, which support the lower peripheral portion of the tubular body and slide the tubular body as the guide portion. The pipe retractor according to any one of claims 1 to 7 is disposed in a manhole,
The tube retractor is fixed in the manhole by the fixing mechanism,
Insert the tube from the upper opening of the manhole,
By guiding the inserted pipe body through the guide part, guiding it to the drain pipe,
A pipe retracting method, wherein the guided pipe is inserted into a drain pipe.