JP2008025761A - Drain pipe-reclaiming resin pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin pipe easy to handle and sufficiently strong against tension in the axial direction of the pipe. <P>SOLUTION: The drain pipe-reclaiming resin pipe is inserted through an existing drain pipe, and the existing drain pipe is integrated with resin pipe via a solidifying material. The resin pipe 5 comprises soft resin pipes 5d, 5e having buried reinforcing materials 5f, and semi-hard resin elastically deformable protruded strips 5c formed on the outer walls of the soft resin pipes in a spiral or ring shape. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention is suitable for a drainage pipe renewal method in which a new resin pipe is inserted into an existing drainage pipe such as an aging sewer pipe, and the drainage pipe is rehabilitated by integrating the existing drainage pipe and the new resin pipe. This relates to a resin tube.

  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 rehabilitation method in which an old drainage pipe is used as a support and a new drainage pipe is formed with a resin pipe inside the drainage pipe rehabilitation method has been implemented.

  There are various drainage pipe rehabilitation methods. For example, the pipe making method supplies a band-like hard polyvinyl chloride material into the manhole, and the belt-like hard polyvinyl chloride material is supplied to the manhole by the pipe making machine. It is inserted into the sewer pipe while forming a tubular shape.

  In addition, a so-called sheath tube method is also known in which instead of a strip-like hard vinyl chloride material, a short short pipe having a diameter smaller than that of the sewage pipe is introduced from the manhole and inserted into the sewage pipe while being sequentially connected.

  However, in the said pipe making method, exclusive construction facilities, such as a pipe making machine, are required, and a skilled worker is needed for the construction. On the other hand, the sheath tube method does not require a pipe making machine, but has already been manufactured as a pipe, so it is not easy to handle in a narrow manhole.

  Moreover, in both methods, connection work is indispensable to form a pipe body in an existing sewer pipe, and there is a problem that considerable work time must be spent to improve the sealing performance of the connection part.

  Therefore, recently, as a construction method in which a pipe body can be easily formed in a sewage pipe without requiring a dedicated construction facility, a flexible resin pipe 50 is fed out from a rotary drum 51 as shown in FIG. A method has been proposed in which the resin pipe 50 is inserted into one of the sewage pipes 53 as it is through the manhole 52 by using the flexibility of the resin pipe 50 and is taken up by the winch 54 from the other side of the sewage pipe 53 (for example, a patent). Reference 1).

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

Also, the resin pipe made of a straight pipe is folded in a state where the cross section becomes a heart shape, drawn into the existing sewer pipe, steam is sent into the folded resin pipe and heated, and the resin pipe is made by the shape memory effect. There is also known a method for restoring a circular shape and further feeding compressed air into close contact with the inner wall of the sewer pipe.
JP 2002-38581 A

  However, in the construction method described in Patent Document 1, the convex portion and the concave portion are integrally formed in a spiral shape or a ring shape in the tube axis direction, or a flat resin tube 50 without unevenness is used as a new drainage pipe. There is a problem in that the tensile strength in the tube axis direction is low, and if the winch 54 is pulled roughly, it is stretched and the load resistance is lowered.

  The foldable resin pipe is flexible and easy to handle, but is not integrated with the sewage pipe, so the strength as a new drain pipe is not so high.

  The present invention has been made in consideration of the problems in the conventional drainage pipe rehabilitation method as described above, is easy to handle during construction, and has sufficient strength to resist tensile in the pipe axis direction. Another object is to provide a resin pipe for drainage pipe rehabilitation.

  The present invention provides a resin pipe for drainage pipe rehabilitation in which a resin pipe is inserted into an existing drain pipe, and the existing drain pipe and the resin pipe are integrated via a solidifying material. A drainage pipe rehabilitation resin pipe composed of an embedded soft resin pipe and an elastically deformable protrusion made of a semi-rigid resin formed in a spiral or ring shape on the outer wall of the soft resin pipe. is there.

  In the present invention, the soft resin tube includes a lower wound soft resin layer, an upper wound soft resin layer wound around the outer surface of the lower wound soft resin layer, and a reinforcing fiber as a reinforcing material sandwiched between these soft resin layers. It can consist of.

  In the present invention, it is preferable to use glass cloth as the reinforcing material. The glass cloth is preferably coarse enough to allow the lower and upper wound soft resin layers and the upper wound soft resin layer to be fused by passing through the glass cloth when the soft resin tube is manufactured.

  In the present invention, as the semi-rigid resin, an elastomer is blended with a thermoplastic resin, whereby the ridges can be formed to be elastically deformable.

  In the present invention, if the soft resin pipe is composed of a transparent member, when the fluidized solidifying material is injected between the inner wall of the existing drain pipe and the outer wall of the resin pipe to integrate both pipes, Whether the solidifying material is injected or not can be confirmed from the inside of the resin tube through the resin tube.

  According to the present invention, since the protrusion is configured to be elastically deformable, the size can be reduced by compressing the resin pipe in the radial direction when being drawn into the existing drainage pipe, thereby making it easy to handle. Become. Moreover, since the reinforcing material is embedded in the soft resin, it is possible to provide sufficient strength that can resist the tensile force in the tube axis direction.

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

  First, a drainage pipe rehabilitation method to which a drainage pipe rehabilitation resin pipe (hereinafter abbreviated as a resin pipe) of the present invention is applied will be described with reference to FIG.

  In the figure, a plurality of drain pipes (hereinafter referred to as existing drain pipes) 1 buried in the soil are usually made of concrete pipes, and each existing drain pipe 1 has a manhole ( Connection housings 2 and 3 are respectively connected to openings 2a and 3a provided in the lower part.

  When inspecting the existing drainage pipe 1, first, a camera is inserted into the interior of the drainage pipe 1 to investigate whether a crack has occurred. As a result of the investigation, if a crack has occurred and repair is required, the existing drain pipe 1 is cleaned with high-pressure cleaning water as a repair preparation. In the figure, 4 is a water stop cock for preventing washing water from entering other drain pipes.

  Next, the resin pipe of the present invention is drawn into the washed existing drain pipe 1.

  FIG. 2 shows the drawing method.

  In the figure, in the drainage pipe structure in which one end of the existing drainage pipe 1 is connected to the left manhole 2 and the other end is connected to the right manhole 3, either one of the manholes, in this embodiment, the upper part of the left manhole 2 A rotating drum 6 around which the resin tube 5 folded flat is wound is disposed in the vicinity of the opening 2b.

  When the resin tube 5 unwound from the rotating drum 6 is inserted into the left manhole 2 through the upper opening 2b, the cross section is restored to a circular shape, and a drawing jig 7 is attached to the tip 5a.

  On the other hand, a winch 8 is disposed in the vicinity of the upper opening 3 b of the right manhole 3, and the drawing jig 7 is connected to a wire 9 unwound from the winch 8. Therefore, when the winch 8 is driven in the winding direction, the resin tube 5 is pulled in the direction of arrow A through the wire 9.

  In the figure, reference numerals 10a to 10e denote arch-shaped guides for guiding the resin pipe 5 into the left manhole 2, and a guide roller 11 for smoothly transferring the resin pipe 5 is provided below each arch-shaped guide. Is provided.

  Reference numerals 12 and 13 denote arch-shaped guides provided on the outlet side of the existing drainage pipe 1, and guide rollers 12a and 13a are provided at portions where the corrugated resin pipe 5 slides.

  3 is an enlarged view of the resin pipe 5, and FIG. 4 is an enlarged view of a portion B in FIG.

  In both figures, the resin pipe 5 has a straight pipe portion 5b and a ridge portion 5c formed in a spiral shape on the outer wall of the straight pipe portion 5b.

  The straight pipe portion 5b is composed of a transparent lower wound soft resin layer 5d, a transparent upper wound soft resin layer 5e, and a glass cloth 5f as a reinforcing material interposed between the two resin layers.

  The lower and upper soft resin layers 5d and 5e are made of a thermoplastic resin excellent in chemical resistance, for example, a polypropylene blended with a styrene elastomer, and the ridge 5c is also blended with the above styrene elastomer in polypropylene. The blending ratio of styrene elastomer to polypropylene is adjusted.

  Specifically, the lower and upper wound soft resin layers 5d and 5e are made soft by blending polypropylene 3 with a styrene elastomer at a ratio of 1, and one styrene elastomer is blended with polypropylene 2. Thus, the protrusion 5c is semi-rigid.

  The resin tube 5 in the present embodiment has an outer diameter of 570 to 595 mm, an inner diameter of 545 ± 20 mm, and the winding pitch of the protrusion 5c is 20 to 50 mm.

  As the glass cloth 5f, one cut into a width of 40 to 100 mm can be used.

Moreover, about the coarseness of the glass cloth 5f, the thing of 6 * 6mm-10 * 10mm can be used. That is, when the lower wound soft resin layer 5d and the upper wound soft resin layer 5e are formed, the roughness of the eyes is selected so that the lower wound soft resin 5d and the upper wound soft resin 5e are fused through the opening of the mesh. The basis weight is 50 to 150 g / m ² .

  The glass cloth 5f is sandwiched between the resin layers 5d and 5e when the lower soft resin layer 5d and the upper soft resin layer 5e are formed into a tubular shape, and is integrated with the resin layers 5d and 5e. The glass cloth 5f is laid from one end of the resin tube 5 to the other end, and functions as a reinforcing material that resists pulling in the tube axis direction.

  The glass cloth 5f is spirally wound around the outer surface of the lower wound soft resin layer 5d, but is wound in a state of being partially wrapped in the width direction (tube axis direction).

  For example, with respect to the resin tube 5 having a pitch of the protrusions 5c of 30 mm, a glass cloth 5f having a width of 60 mm is used, and 30 mm is used as a lapping margin when being wound. Thereby, the glass cloth 5f is spanned between the protrusions 5c.

  In this way, by providing a lapping margin and sandwiching the glass cloth 5f between the lower soft resin layer 5d and the upper soft resin layer 5e and integrating them, the soft resin layers 5d and 5e can be formed when the resin tube 5 is retracted. While being able to prevent extending, the inner surface of the resin pipe 5 can be kept smooth.

  In this embodiment, glass cloth is used as the reinforcing material, but polyester, nylon, vinylon, aramid, or the like can also be used.

  Next, returning to FIG. 2, the drainage pipe rehabilitation method using the resin pipe 5 will be described.

  The resin tube 5 wound around the rotating drum 6 is unwound, and the tip 5a is inserted into the manhole 2 from the upper end opening 2b of one of the two manholes 2 and 3 adjacent to each other in the arrangement path. To do.

  A drawing jig 7 is attached to one end of the loaded resin tube 5, and a wire 9 drawn from the other manhole 3 is connected to the drawing jig 7.

  Next, the winch 8 is driven to take up the wire 9, and the resin pipe 5 is drawn into the existing drain pipe 1.

  Note that when the resin pipe 5 is drawn into the existing drain pipe 1, since the spiral protrusion 5c is formed in the resin pipe 5, the contact area when the resin pipe 5 is drawn is small, and the frictional resistance is reduced. be able to.

  In addition, by forming the protrusion 5c, a space for pouring grout (described later) into the existing drain pipe 1 can be secured. In addition, the amount of grout injected can be reduced as compared with a rehabilitation resin pipe composed of a straight pipe.

  Further, when the resin tube 5 is pulled through the wire 9, a tensile load is concentrated on the straight tube portion 5b (see FIG. 3) made of a soft resin layer. The straight tube portion 5b has a glass cloth 5f. Is embedded and resists the tensile load, so that the resin tube 5 can be prevented from extending in the tube axis direction.

  When the resin pipe 5 is penetrated into the existing drainage pipe 1, the grout 14 is injected into the annular gap S between the inner wall of the existing drainage pipe 1 and the outer wall of the resin pipe 5, as shown in FIG.

  This grout 14 is a high fluidity mixture of mortar and chemicals, and is injected for the purpose of water stoppage and integration.

  Note that a self-propelled camera (not shown) is disposed in the resin tube 5 in advance, and an image photographed by the self-propelled camera is displayed on an external monitor screen via a cable. ing. Since the straight pipe portion of the resin pipe 5 is made of the transparent resin as described above, the injection state of the grout 14 can be confirmed on the monitor screen.

  Thus, when the grout 14 is injected from the downstream side of the resin tube 5, the injection state of the grout 14 rising along the outer peripheral surface of the resin tube 5 can be clearly grasped on the monitor screen. Therefore, the operator can easily confirm on the monitor screen whether there is a portion where an injection failure has occurred.

  When the grout 14 flows out from the upstream end of the existing drain pipe 1, the injection is completed.

  Further, when an injection failure is found, the grout 14 is injected from the upstream side of the resin pipe 5 into the injection failure portion from the auxiliary injection hose inserted in advance between the outer wall of the resin pipe 5 and the inner wall of the existing drainage pipe 1. Is done.

  Next, another drainage pipe rehabilitation method using the resin pipe 5 will be described.

  In the resin tube 5 of the present invention, since the spiral protrusion 5c can be elastically deformed, it can be easily deformed and folded into a heart shape when a pressing force is applied in the diameter direction of the tube. It has become. In addition, the resin tube 5 does not break or be damaged even when folded.

  FIG. 6 shows a state in which the folded resin pipe 5 is drawn into the existing drain pipe 1. Since the folded resin pipe 5 can be reduced in size by about half, the operation of drawing it into the existing drain pipe 1 becomes very simple.

  When the insertion of the folded resin pipe 5 into the existing drain pipe 1 is completed, the cross section of the resin pipe 5 can be restored to a circular shape by the self-repulsive force. Alternatively, the cross section of the resin tube 5 can be restored to a circular shape by sending compressed air into the resin tube 5.

  When the cross section of the resin pipe 5 is restored to a circular shape, the grout 14 is injected into the gap between the outer wall of the resin pipe 5 and the inner wall of the existing drain pipe 1 as described above, and the resin pipe 5 and the existing drain pipe 1 are integrated. Can be.

  As described above, since the resin tube 5 of the present invention can be wound around the drum in a state of being deformed into a flat shape or a heart shape, it can be transported in a compact manner.

  In addition, in the said embodiment, although the protruding part 5c was formed in the spiral, it is not restricted to this, You may form many ring-shaped protruding parts 5c in the pipe-axis direction.

It is sectional drawing which showed the structure of the sewer pipe to which the resin pipe of this invention is applied. It is sectional drawing which showed the drawing-in method of the resin pipe | tube which concerns on this invention. It is a front view which has a notch of the resin pipe which concerns on this invention. It is the B section enlarged view of FIG. It is sectional drawing which shows the construction state of the resin pipe which concerns on this invention. It is a side view which shows another drawing-in method of the resin pipe | tube which concerns on this invention. It is sectional drawing which shows the conventional drain pipe renovation construction method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drain pipe 2,3 Manhole 4 Stop cock 5 Resin pipe 5a Tip 5b Straight pipe part 5c Projection part 5d Lower winding soft resin layer 5e Upper winding soft resin layer 5f Glass cloth 6 Rotating drum 7 Retraction jig 8 Winch 9 Wire 10a- 10e Arch guide

Claims (5)

In the resin pipe for drainage pipe rehabilitation that inserts the resin pipe into the existing drainage pipe and integrates the existing drainage pipe and the resin pipe via the solidifying material,
The resin tube is composed of a soft resin tube in which a reinforcing material is embedded, and an elastically deformable protrusion formed in a spiral shape or a ring shape on the outer wall of the soft resin tube and made of a semi-rigid resin. A resin pipe for drainage pipe rehabilitation characterized by   The soft resin tube is composed of a lower soft resin layer, an upper soft resin layer wound around the outer surface of the lower soft resin layer, and reinforcing fibers as the reinforcing material sandwiched between the soft resin layers. The drain pipe rehabilitation resin pipe according to claim 1.   The resin pipe for drainage pipe rehabilitation according to claim 1 or 2, wherein a glass cloth is embedded as the reinforcing material.   The drain pipe rehabilitation resin pipe according to any one of claims 1 to 3, wherein an elastomer is blended in the thermoplastic resin as the semi-rigid resin, thereby forming the protrusions so as to be elastically deformable.   The drain pipe rehabilitation resin pipe according to any one of claims 1 to 4, wherein the soft resin pipe has transparency.

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