JPH08312835A - Existing pipe reclamation means - Google Patents

Abstract

PURPOSE: To suppress reduction of flow quantity and reclaim large aperture, noncircular existing pipes by forming a helical pipe, which has a synthetic resin made belt-shaped body containing a metal made contour retaining member helically wound around it and engaged with adjoining parts, and deforming the perpendicular sectional form with respect to the longitudinal direction of the helical pipe. CONSTITUTION: A synthetic resin made belt-shaped body 1 contains engaging parts of such structure as having the edge of one side provided with recessed parts and the edge of the other side with protruded parts and the recessed parts and the protruded parts fitted together, and it is formed by such a way as inserting metal made retaining members 3, which are made in a shape so that they can be locked in a T shape, into T shape ribs 11 erected on the outside. A helical pipe 10 is obtained by winding the belt-shaped body 1 helically. The sectional form of the helical pipe is deformed into a circular or noncircular shape by pressing the helical pipe from its interior with a hydraulic jack. Helical pipes 10 are connected together by an incore joint 4 or the like, which sectional form is approximately the same as the helical pipe 10 after being deformed and which contains a joint of a shape that can be fitted into the interior of the helical pipe 10.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method for rehabilitating an existing pipe. Particularly, it is suitably used for a method for rehabilitating existing non-circular tubes such as box culverts and oval tubes.

[0002]

2. Description of the Related Art As a method of rehabilitating an aged pipe,
There is a method of lining a rigid synthetic resin pipe by inserting it into an existing pipe, but it is difficult to manufacture a pipe to be lined when the existing pipe has a large diameter. For this reason, there is a method of spirally winding a synthetic resin strip having engaging portions on both side edges and engaging adjacent engaging portions with each other to form a spiral tube and lining ( JP-A-2-245317, JP-B-3-48392, and JP-B-3-10493). In such a lining method, since a synthetic resin strip is spirally wound, the cross-sectional shape of the spiral tube is circular. Therefore, if the diameter of the spiral pipe is set to be slightly smaller than that of the existing pipe in the existing pipe having a circular cross-sectional shape, the spiral pipe can be easily inserted.

[0003]

However, if the existing pipe that has deteriorated is a non-circular pipe such as a box culvert having a rectangular cross section or a square such as a square, an oval pipe having an oval cross section, or a horseshoe pipe, There is a problem in that the gap between the non-circular pipe and the spiral pipe having a circular cross-sectional shape becomes large, the effective cross-sectional area after rehabilitation becomes small, and the flow rate decreases. Furthermore,
If the existing old pipe is a box culvert,
Since the box culvert has a large cross-sectional area, extrusion molding a large-diameter square synthetic resin pipe requires huge equipment such as an extruder and a cooler, and the large-diameter square pipe is inserted into the existing pipe. There was a problem that rehabilitation was not realistic.

Therefore, as a method of rehabilitating an existing non-circular tube such as a box culvert or an oval tube, a method of assembling an epoxy resin sprayed lining or a lining material such as a steel plate in the existing tube (Japanese Patent Laid-Open No. 4-269298). ) Is being considered. However, the method of assembling the lining material such as a steel plate in the existing pipe requires assembling, and the workability is poor. Also,
Epoxy resin spray lining method, it is necessary to completely shut off the flowing sewage, epoxy resin spraying process and drying process is required, it takes a long construction period,
There is a problem that it takes a long time to completely shut off the sewage. In particular, when a large amount of sewage flows in a conduit such as a confluence pipe, there is a problem that it is difficult because the sewage cannot be blocked.

[0005]

According to the method of rehabilitating an existing pipe of the present invention as set forth in claim 1, there is provided a synthetic resin band-like body having engaging portions on both side edges and having a metal shape retaining member. , Spirally wound to form a spiral tube in which adjacent engaging portions are engaged,
A cross-sectional shape perpendicular to the longitudinal direction of the spiral tube is deformed, and the spiral tubes are connected to each other by a joint having a shape substantially the same as the cross-sectional shape of the deformed spiral tube.

According to a second aspect of the present invention, there is provided a method of rehabilitating an existing pipe, wherein the joint has an outer diameter substantially the same as or slightly smaller than the inner diameter of the spiral tube.

According to a third aspect of the present invention, there is provided a method of rehabilitating an existing pipe, characterized in that the joint connects the end portion of the spiral pipe by inserting it.

In the method for rehabilitating an existing pipe according to the present invention as described in Invention 4, the joint includes a ridge having a contact surface with which the end faces of the spiral pipes come into contact when the spiral pipes are connected to each other, and the existing pipe is provided on the ridge. The backfill injection port for injecting the backfill agent is opened between the spiral tube and the spiral tube.

In the method for rehabilitating an existing pipe according to a fifth aspect of the present invention, the joint has a groove on the surface facing the spiral tube to be connected, and the retaining ring is attached to the groove. It is characterized by

In the method for rehabilitating an existing pipe of the present invention described in the present invention 6, the joint has a concave groove on the surface facing the spiral pipe to be connected, and a seal rubber ring is attached to the concave groove. Is characterized by.

In the above structure, the engaging portion of the belt-like body is provided with a concave portion on one side edge and a convex portion on the other side edge so that the concave portion and the convex portion are fitted together, and FIG. 4 (a) shows the structure. As shown in FIG. 4 (b), the concave portions are provided on both side edges and the adjacent concave portions are fitted with the band material for fitting. A structure in which the recessed portions are sandwiched between strips is preferable because it is easy to form a spiral tube and has excellent waterproofness.

As the material for the belt-like material, synthetic resins such as polyethylene, polypropylene, and soft polyvinyl chloride are preferable because they are excellent in weather resistance and chemical resistance and are light in weight and thus excellent in workability. In particular, polyolefins such as polyethylene and polypropylene are preferably used because they have low rigidity and are easily bent.

As a method of mounting the metal shape-retaining member on the band-shaped body, a T-shaped rib is provided upright in the longitudinal direction on the outer surface of the band-shaped body, and the metal band-shaped material is placed between the ribs. A method of inserting it, a method of embedding a metal plate material inside the band-shaped body, and the like are preferable.

As a method of deforming the spiral tube, it is preferable to press from the inside of the spiral tube with a hydraulic jack or compress from the outside of the spiral tube with a roller or the like. The manufacturing of the spiral pipe and the modification of the cross-sectional shape of the spiral pipe may be performed in the factory, near the construction site, or in the existing pipe.

The joint has a joint portion having a shape that can be fitted inside (in) the spiral pipe (in-core joint), and when the spiral pipe is connected to the joint after the spiral pipe is carried into the existing pipe, It is preferable because it is easy for a worker to enter the pipe and connect it. Further, even if a T-shaped rib is erected on the outer peripheral surface of the spiral tube to reinforce external pressure, the spiral tube has a shape that can fit inside (in), so that insertion is easy.

As shown in FIG. 5, when the joint has a joint having a shape that can be fitted to the outside (out) of the spiral pipe, the T-shaped rib on the outer peripheral surface of the spiral pipe is cut. You can join them later.

When connecting the spiral tube and the joint, it is preferable to apply a sealant such as a moisture-curable urethane resin or a water-stopping lubricant to the joint because the water-stoppage is excellent. . As a method for connecting the spiral tube and the joint, a method of welding the joint surface with a welding rod and a method of embedding a heating coil inside the joint and fusion-bonding are preferable. Further, instead of the existing pipe, a spiral pipe may be inserted into the primary lining pipe line of the shield to form the secondary lining.

[Operation] According to the configuration of the existing pipe rehabilitation method of the present invention, since the band-shaped body is wound, a spiral tube having an arbitrary diameter can be formed, and a large diameter is also possible. In addition, since the spiral tube has the metal shape-retaining member, the cross-sectional shape of the spiral tube can be maintained in a non-circular shape such as a rectangular shape, a square shape, an elliptical shape, an oval shape tube, or a horseshoe shape. Further, since the metal shape-retaining member is provided, the spiral tube is not deformed and buckled by the injection pressure even when the backfilling agent is injected between the existing tube and the spiral tube.

Further, since a spiral pipe having substantially the same shape and diameter as a non-circular existing pipe can be inserted, the effective cross-sectional area after rehabilitation becomes large and the reduction rate of the flow rate can be made small. . Furthermore, since the joint inserts and connects the end of the spiral pipe, it is easy for a worker to enter the spiral pipe for connection when there is no or a small gap between the existing pipe and the spiral pipe.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings showing the embodiments thereof. FIG. 1 is a partially cutaway perspective view of a spiral tube deformed for a box culvert according to the present invention, and FIG. 2 is a vertical sectional view of a spiral tube deformed for a box culvert according to the present invention. The deformed spiral tube is slightly smaller than the existing tube having a height of 2500 mm and a width of 3000 mm, and the tube length is 2000 mm.
It is dimensioned so that it can be inserted from the manhole (vertical shaft) 9 mm to 3000 mm.

A metal shape retainer having a shape (W-shape) that can be locked in a T-shape is provided between T-shape ribs 11 erected in the longitudinal direction on the outer surface of the strip 1 made of high-density polyethylene. The member 3 is inserted and spirally wound to manufacture a spiral tube having a circular cross section. Then, the cross section is deformed into a rectangular shape by pressing it from the inside of the spiral tube with a hydraulic jack.

Next, the construction method of the present invention will be described with reference to FIG. First, since the spiral tube 10 whose cross-sectional shape is deformed into a rectangle is easy to join in the box culvert 7, the in-core joint 4 is fitted to one end of the spiral tube 10 to have a single-sided receiving shape. The in-core joint 4 is a square tube having a ridge 41 having an abutting surface against which the end surfaces of the spiral tubes 10 come into contact when the spiral tubes 10 are connected to each other. And
The spiral tube 10 is carried in from the manhole 9 by a crane, and placed on the rail 8 and inserted into the box culvert 7.

Next, a moisture-curable urethane resin sealant is applied to the inner periphery of the other end where the in-core joint 4 is not fitted, and the cores are joined and joined. Then, the joint surface between the end of the cylindrical portion of the in-core joint 4 and the spiral tube 10 is welded with a welding rod. The above work is repeated to attach the spiral tube 10 over the entire length of the box culvert 7.

Next, before attaching the spiral tube 10, a back-filling injection tube (not shown) is attached in the box culvert 7, and a back-filling agent (air mortar) is placed in the gap between the box culvert 7 and the spiral tube 10. inject. When injecting the backfilling agent (air mortar), a supporting structure may be provided in the spiral tube 10 in order to further prevent the spiral tube from buckling due to the injection pressure of the backfilling agent. Also, in order to prevent floating by backfilling agent, the upper part of the spiral tube 10 and the box culvert 7
A spacer (not shown) was installed between the two. In order to prevent floating with the backfilling agent, W is more than the height of the T-shaped rib.
The shape-retaining member 3 made of a V-shaped metal is projected so that the projection 3
1 may be used as a spacer.

Further, as shown in FIG. 6, the in-core joint 4
As the back filling inlet, the back filling inlet 42 is opened in the protruding portion 41, and the spiral tubes 10 are connected so that their end surfaces abut against the contact surface of the protruding portion 41. 42, the backfilling agent A may be injected between the box culvert 7 and the spiral tube 10. In this case, it is not necessary to attach a backfill injection pipe in the box culvert 7 before attaching the spiral pipe 10, and the backfill injection port 42 is provided in the ridge 41 as the in-core joint 4 of the portion requiring injection. Use the one that is open and its backfilling injection port 4
It is convenient because the backfilling agent can be injected more than in 2.

As shown in FIG. 7, as the in-core joint 4, a spiral groove having a concave groove 43 on the surface facing the spiral tube 10 to be connected, and a retaining ring 44 attached to the concave groove is used. Insert pipe 4 by connecting pipes 10 together
It is preferable because the spiral tube 10 is prevented from coming out of the spiral tube 10.

As shown in FIG. 8, as the insert joint 4, one having a groove 45 on the surface facing the spiral tube 10 to be connected and having a seal rubber ring 46 attached to the groove 45 is used. It is preferable to connect the pipes 10 to each other because the connection part can be reliably sealed.

As a method for manufacturing a spiral tube deformed for a box culvert in the vicinity of the site, as shown in FIG. When it is rolled into a shape, a metal shape-retaining member is fitted between the ribs to first make a circular tube, and make it to a length (usually 2 m) that can be hung in a vertical pile and installed on the same stand 21. Cut with a cutting machine 23. The cut cylindrical tube is slid on a box culvert forming device 24 installed on the same frame, and for example, as shown in FIG. 10, four pressing rolls 241, 241 having expansion / contraction functions are provided via a frame. 241,2
41 is inserted into a circular tube, and four corners are simultaneously expanded from the inside of the tube to permanently deform the metal shape-retaining member and compressively deform without heating. Since the spiral tube 10 deformed for the box culvert can be manufactured in the vicinity of the site by this field pipe manufacturing apparatus, it is not necessary to manufacture it in the factory in advance and transport it to the remote site, and the cost can be reduced.

[Effects of the embodiment] According to the embodiment, since the polyolefin has flexibility, it can be easily deformed. Polyolefin has a problem that it cannot be adhered because it has a non-polar property, but it can be connected by welding or fusing the spiral tube and the in-core joint. In particular, since an in-core joint is used, welding or fusion is easy and workability is excellent.
The inner surface of the spiral pipe after the construction was smooth and the roughness coefficient was small (n = 0.01), so that the decrease in the flow rate was extremely small.

[0030]

According to the structure of the existing pipe rehabilitation method of the present invention described above, since the band-shaped body is wound, a spiral pipe having an arbitrary diameter can be formed, and a large diameter is also possible. Further, since the shape maintaining member made of metal is included, it is possible to maintain the cross-sectional shape of the spiral tube in a non-circular shape such as a rectangular shape, a square shape, an oval shape, an oval shape tube, or a horseshoe shape shape tube. Further, since it is possible to insert a spiral pipe having substantially the same shape and diameter as the non-circular existing pipe, it is possible to reduce the reduction rate of the flow rate. That is, it is possible to rehabilitate the existing pipe having a large diameter and a non-circular shape while suppressing a decrease in the flow rate.

Further, since the construction is easy and the construction period is short, the sewage cutoff period is short, and even if the sewage is slightly discharged,
A spiral tube can be inserted. Furthermore, since the joint inserts and connects the end of the spiral pipe, it is easy for a worker to enter the spiral pipe for connection when there is no or a small gap between the existing pipe and the spiral pipe.

[0032]

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a spiral tube deformed for a box culvert used in the present invention.

FIG. 2 is a longitudinal sectional view of a spiral tube deformed for a box culvert according to the present invention.

FIG. 3 is an explanatory diagram illustrating a construction method according to the present invention.

FIG. 4 is a schematic view illustrating an engaging portion of a strip according to the present invention.

FIG. 5 is a partially cutaway perspective view of a spiral tube deformed for a box culvert according to the present invention.

FIG. 6 shows another example of the in-core joint used in the present invention,
Explanatory drawing shown with the aspect which connected the spiral pipes using it

FIG. 7 is another example of the in-core joint used in the present invention,
Explanatory drawing shown with the aspect which connected the spiral pipes using it

FIG. 8 shows another example of the in-core joint used in the present invention,
Explanatory drawing shown with the aspect which connected the spiral pipes using it

FIG. 9 is a front view illustrating a production line of a spiral tube deformed for a box culvert of the present invention.

10A and 10B are explanatory views of the box culvert molding apparatus in the manufacturing line shown in FIG. 6, in which FIG. 10A is a side view and FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 band-shaped body 3 metal shape-retaining member 4 in-core joint 10 spiral tube 42 back-filling agent injection port 43, 45 concave groove 44 retaining ring 46 seal rubber ring

Claims (6)

[Claims] 1. A method of rehabilitating an existing pipe, wherein a spiral pipe is inserted into the existing pipe to rehabilitate the same, and a synthetic resin band-shaped body having engaging portions on both side edges and having a metal shape-retaining member is provided. , Spirally winding and engaging adjacent engaging portions to form a spiral tube, and deforming the cross-sectional shape perpendicular to the longitudinal direction of the spiral tube to change the cross-sectional shape of the spiral tube after deformation. A method of rehabilitating an existing pipe, characterized in that the spiral pipes are connected to each other by a joint having a shape substantially the same as the above. 2. The joint has an outer diameter that is substantially the same as or slightly smaller than the inner diameter of the spiral tube.
Rehabilitation method for the existing pipe described. 3. The method for rehabilitating an existing pipe according to claim 1, wherein the joint is for inserting and connecting the end portion of the spiral pipe. 4. The joint is provided with a ridge having a contact surface with which the end faces of the spiral tubes come into contact when the spiral tubes are connected to each other, and the backfill agent is injected into the ridge between the existing tube and the spiral tube. The method for welding an existing pipe according to claim 1, wherein the backfill injection port is opened. 5. The existing pipe according to claim 1, wherein the joint has a concave groove on a surface facing the spiral pipe to be connected, and the retaining ring is attached to the concave groove. Welfare method. 6. The welfare for an existing pipe according to claim 1, wherein the joint has a groove on a surface facing the spiral tube to be connected, and a seal rubber ring is attached to the groove. Method.