JP6769810B2 - Band-shaped member for forming a spiral tube - Google Patents

Description

The present invention relates to a band-shaped member for forming a spiral pipe used when rehabilitating an existing pipe that has deteriorated.

Metal pipes and hume pipes have long been used for existing pipes used as waterworks and sewers. Such existing pipes may deteriorate due to long-term use and leak due to cracking or corrosion. For this reason, recently, a synthetic resin pipe is inserted into an existing pipe such as an aged buried pipe for lining.

As one of the lining methods for existing pipes, a method of lining an existing pipe with a spiral pipe formed by spirally winding a band-shaped member made of synthetic resin is known. In this method, a strip-shaped member for an existing pipe lining is spirally wound, and adjacent side edges of the spirally wound strip-shaped member are engaged with each other to manufacture a spiral pipe. By inserting the spiral pipe into the existing pipe, the inner surface of the existing pipe is lined by the spiral pipe.

Some of the strip-shaped members are provided with mountain-shaped expansion / contraction portions so that the spiral tube to be formed can easily extend in the axial direction (Patent Documents 1 and 2). By providing the elastic part in the band-shaped member in this way, the external force at the time of an earthquake is absorbed to prevent the spiral pipe from being damaged, and the large tensile force acting in the width direction of the band-shaped member is absorbed in the curved part of the existing pipe. It becomes possible to do.

When a strip-shaped member provided with an expansion / contraction portion is made into a spiral tube, the expansion / contraction portion forms a spiral groove portion on the inner surface of the spiral tube, and unevenness is generated. Such a groove may be a starting point for clogging of dust or worsen the roughness of the inner surface of the spiral tube.

Patent Document 1 discloses a configuration in which a side end portion of a strip-shaped member is extended so as to reach an elastic portion of an adjacent strip-shaped member. In this configuration, in the normal state (when there is no large deformation in the telescopic portion), the groove portion is hidden by the adjacent strip-shaped member, and the groove portion can be prevented from being exposed on the inner surface of the spiral tube.

Further, Patent Document 2 discloses a configuration in which an elastic body is arranged in a compressed state in the telescopic portion, and the surface of the strip-shaped member and the surface of the elastic body are positioned in the same plane. In this configuration, the force applied in the width direction of the strip-shaped member in the spiral tube is absorbed by the expansion / contraction portion, and the elastic body expands / contracts while being located in the same plane as the inner surface of the spiral tube.

JP-A-11-034165 Japanese Patent Application Laid-Open No. 6-1432420

In the structure of Patent Document 1 or 2, it is possible to alleviate the unevenness due to the groove in the place where the deformation in the expansion / contraction portion is small, such as the straight pipe portion of the spiral tube. However, such a spiral tube is not always formed only by a straight tube portion, and the spiral tube also has a curved portion. When a curved spiral tube is manufactured by a band-shaped member provided with an elastic portion, the amount of deformation (extension width) of the elastic portion becomes large on the outer peripheral side of the curved portion, and the groove portion also opens widely.

In the structure of Patent Document 1, there is a problem that the opened groove cannot be completely hidden in a curved portion or the like where the groove is widely opened, and the groove is exposed on the inner surface of the spiral tube to cause unevenness. Further, the structure of Patent Document 2 has a problem that the elastic body arranged in the expansion / contraction portion is deformed so as to be greatly depressed, and unevenness is generated between the inner surface of the spiral tube and the surface of the elastic body. Alternatively, the elastic body may not be able to keep up with the deformation of the elastic body, and peeling may occur at the interface between the elastic body and the elastic body.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a band-shaped member for forming a spiral tube, which can always smooth the inner surface of the spiral tube regardless of the amount of deformation of the elastic portion.

The band-shaped member for forming a spiral tube of the present invention is a band-shaped member for forming a spiral tube that is spirally wound to form a spiral tube in order to solve the above-mentioned problems, and serves as an inner surface of the spiral tube. When the side is the inner surface of the spiral tube forming band-shaped member and the side to be the outer surface of the spiral tube is the back surface of the spiral tube forming band-shaped member, the expansion and contraction formed by bending so as to project to the back surface side. It is characterized by having a strip-shaped member main body having a portion and a stretchable sheet having elasticity and being laminated and arranged so as to cover the stretchable portion on the inner surface side of the strip-shaped member main body.

According to the above configuration, when the spiral tube forming band-shaped member is wound to form the spiral tube, if a tensile force in the width direction is applied to the band-shaped member body to open the stretchable portion, the stretchable portion is covered. The stretched sheet also stretches in the width direction accordingly. As a result, the groove portion due to the expansion / contraction portion is not exposed on the inner surface of the spiral tube, and the inner surface of the spiral tube is kept smooth by the drawn sheet. That is, it is possible to prevent the groove portion existing on the inner surface of the spiral tube from being clogged with dust and the roughness of the inner surface of the spiral tube from being lowered due to the unevenness.

Further, in the spiral tube forming strip-shaped member, the stretched sheet is adhesively fixed to the strip-shaped member main body on both sides of the stretchable portion, and a non-adhesive region that is not bonded is provided around the stretchable portion. It can be configured as

According to the above configuration, by providing the non-adhesive region around the stretchable portion, it is possible to secure the stretch margin of the stretched sheet when the stretchable portion is opened.

Further, the spiral tube forming band-shaped member may have a structure in which a flexible bag-shaped hollow member is arranged inside the telescopic portion.

According to the above configuration, for example, after the spiral tube is manufactured, the hollow member is filled with a filling material and the filling material is cured, so that the spiral tube can be formed not only by the drawn sheet but also by the filling material. The inner surface can be kept smooth.

In the spiral tube forming strip-shaped member of the present invention, when a tensile force in the width direction is applied to the strip-shaped member body to open the stretchable portion, the stretched sheet covering the stretchable portion expands in the width direction accordingly. The inner surface of the spiral tube is kept smooth by the drawn sheet. As a result, the groove portion due to the expansion / contraction portion is not exposed on the inner surface of the spiral tube, the groove portion existing on the inner surface of the spiral tube is clogged with dust, and the roughness of the inner surface of the spiral tube is lowered due to the unevenness. It has the effect of preventing this.

It is explanatory drawing which shows an example of the rehabilitation method of the existing pipe in embodiment of this invention. It is sectional drawing of the strip-shaped member shown in Embodiment 1, (a) is a figure which shows the state which stretch | stretch | stretched | stretched part is not stretched, (b) is the figure which shows the state which stretchable | stretched part is stretched. It is a figure which shows the adhesive / non-adhesive region of the stretched sheet and the main body part in the band-shaped member of FIG. It is a figure which shows the state. It is sectional drawing of the strip-shaped member shown in Embodiment 2, (a) is a figure which shows the state in which the stretchable part is not stretched, and (b) is the figure which shows the state which the stretchable part is stretched.

[Embodiment 1]
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Rehabilitation of an existing pipe is carried out by forming a tubular rehabilitation pipe in the existing pipe and lining the inner surface of the aged existing pipe with this new rehabilitation pipe. As this rehabilitation tube, a spiral tube formed by spirally winding a band-shaped member is used.

FIG. 1 is an explanatory diagram showing an example of a rehabilitation method for an existing pipe. As shown in FIG. 1, a drum 30 in which a strip-shaped member (belt-shaped member for forming a spiral pipe) 2 is wound in advance is installed in the upper manhole 11 of the existing pipe 10 or in the existing pipe 10. The drum 30 is used to continuously supply the strip-shaped member 2 to the self-propelled pipe making machine 40 arranged in the existing pipe 10. The pipe making machine 40 forms a rehabilitation pipe (spiral pipe) 20 by winding the strip-shaped member 2 in a spiral shape and forming it into a tubular shape.

2 (a) and 2 (b) are cross-sectional views showing a shape example of the strip-shaped member 2 in the first embodiment (note that in the drawings referred to in the embodiment, hatching in the cross-sectional view is omitted. ing.). The strip-shaped member 2 is a long strip-shaped member, and is composed of a main body portion (belt-shaped member main body) 21 formed of synthetic resin and a stretched sheet 22. In the following description, when the spiral tube is manufactured by winding the band-shaped member 2, the side that becomes the inner surface of the spiral tube is the inner surface of the band-shaped member 2, and the side that becomes the outer surface of the spiral tube is the band-shaped member 2. The back of the.

The main body 21 is provided with a first fitting portion 212 at one end in the width direction with respect to the flat plate portion 211 which is the inner surface of the spiral pipe when the main body portion 21 is made into a spiral pipe, and the other end portion. Is provided with a second fitting portion 213. The first fitting portion 212 and the second fitting portion 213 are each formed along the longitudinal direction of the main body portion 21 and have a shape that allows them to be fitted and joined to each other. However, the specific shapes of the first fitting portion 212 and the second fitting portion 213 are not particularly limited in the present invention.

Further, the main body portion 21 is provided with a telescopic portion 214 bent in a chevron shape so as to project toward the back surface in the middle of the flat plate portion 211. The telescopic portion 214 is provided so that the strip-shaped member 2 can extend in the width direction thereof. The cross-sectional shape of the telescopic portion 214 is not limited to the substantially U-shape shown in FIG. 2, and may be, for example, a shape bent into a substantially triangular shape or a substantially rectangular shape. Further, the number of the expansion / contraction portions 214 is not limited to the two shown in FIG. 2, and at least one expansion / contraction portion 214 may be formed.

Further, a plurality of reinforcing ribs 215 having a T-shaped cross section are also provided on the back surface side of the main body portion 21. The reinforcing rib 215 is composed of a support column portion 215A and a flange portion 215B. The strut portion 215A is formed so as to project from the flat plate portion 211 to the back surface side, and the flange portion 215B is provided at the tip of the strut portion 215A in a state orthogonal to the strut portion 215A. Each reinforcing rib 215 is formed so that each flange portion 215B is located in the same plane substantially parallel to the flat plate portion 211.

The stretched sheet 22 is made of a resin material having high elasticity, and is arranged so as to be laminated with the flat plate portion 211 on the inner surface side of the main body portion 21 and continuously along the longitudinal direction of the main body portion 21. Further, the stretched sheet 22 is arranged so as to cover at least the stretchable portion 214, and is fixed to the flat plate portion 211 on both sides of the stretchable portion 214 by adhesion or the like.

When the strip-shaped member 2 is wound to form a spiral tube, when a tensile force in the width direction is applied to the main body 21 to open the telescopic portion 214 (see FIG. 2B), the telescopic portion 214 is covered. The stretched sheet 22 also stretches in the width direction accordingly. As a result, the groove portion due to the expansion / contraction portion 214 is not exposed on the inner surface of the spiral tube, and the inner surface of the spiral tube is kept smooth by the stretched sheet 22. That is, in the spiral tube formed by using the strip-shaped member 2 according to the first embodiment, the groove portion existing on the inner surface is clogged with dust, and the roughness of the inner surface of the spiral tube is lowered due to the unevenness. Can be prevented.

As described above, the stretched sheet 22 is fixed to the flat plate portion 211 by adhesion on both sides of the stretchable portion 214, but the stretched sheet 22 is not bonded to the entire surface, but is stretched and contracted as shown in FIG. 3A. It is preferable to provide a non-adhesive region around the portion 214 which is not adhered. By providing the non-adhesive region in this way, it is possible to secure a stretch margin of the stretched sheet 22 when the stretchable portion 214 is opened.

Here, the length L1 in the width direction of the non-adhesive region of the stretched sheet 22 in the default state (see FIG. 3A) in which the tensile force in the width direction is not applied to the main body 21 of the strip-shaped member 2 is as follows. It is set so as to satisfy the equation (1). In the formula (1), L2 is the amount of expansion in the state where the expansion / contraction portion 214 is opened to the allowable limit (see FIG. 3B), and α is the maximum allowable expansion / contraction rate in the width direction of the stretched sheet 22.

(L1 + L2) / L1 <α ... (1)
The material of the stretched sheet 22 is not particularly limited, but it is preferable that the stretched sheet 22 has high elasticity so that it can be deformed following the expansion and contraction portion 214 when it is opened. Further, when the strip-shaped member 2 according to the present embodiment is used for rehabilitation of an existing pipe used as a sewer, the material of the stretched sheet 22 may have water resistance, abrasion resistance, gas resistance and the like. Required. Examples of the material of such a stretched sheet 22 include polyethylene and polyvinyl chloride.

[Embodiment 2]
In the first embodiment, the stretched sheets 22 are laminated and arranged so as to cover the stretchable portion 214 on the inner surface side of the main body portion 21, but the inside of the stretchable portion 214 is a space. On the other hand, the second embodiment is characterized in that the inside of the expansion / contraction portion 214 is filled with a padding material, and the smoothness of the inner surface of the spiral tube is ensured by the padding material.

For example, in the strip-shaped member 2 shown in FIGS. 2A and 2B, a fluid filling material is filled with a space surrounded by the expansion / contraction portion 214 and the stretched sheet 22 as a flow path, and the filling material is filled after filling. It is conceivable to cure. In this case, the filling material is filled after the spiral tube is made by the strip-shaped member 2. That is, when the expansion / contraction portion 214 undergoes elongation deformation during pipe production, the filling material is filled after the deformation, and the expansion / contraction portion 214 is not significantly deformed after the filling of the filling material.

In the above configuration, after the filling material filled inside the expansion / contraction portion 214 is cured, the inner surface of the spiral tube is kept smooth not only by the stretched sheet 22 but also by the filling material. Therefore, the stretched sheet 22 only needs to be able to maintain the smoothness of the inner surface of the spiral tube at least until the filling material is hardened, and the stretched sheet 22 is not required to have long-term durability as compared with the case where the filling material is not filled. I'm done. That is, the range of selection of materials that can be used as the stretched sheet 22 is widened, and as a result, the cost of the stretched sheet 22 may be reduced.

4 (a) and 4 (b) are cross-sectional views showing a modified example of the strip-shaped member 2 in the second embodiment. The strip-shaped member 2 shown in FIGS. 4A and 4B has a structure substantially similar to that of the strip-shaped member 2 shown in FIGS. 2A and 2B, but the hollow member 23 is arranged inside the telescopic portion 214. The only difference is that it is done. The hollow member 23 is a flexible bag-shaped member, and is continuously arranged along the longitudinal direction of the main body portion 21.

In this configuration, the hollow member 23 is arranged inside the telescopic portion 214 in a recessed state in the default state (see FIG. 4A), but when the filling material is filled inside, the hollow member 23 is placed. It is in an inflated state (see FIG. 4B). Even in the above configuration, after the filling material filled in the hollow member 23 is cured, the inner surface of the spiral tube is kept smooth not only by the stretched sheet 22 but also by the filling material.

The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims, and the embodiments obtained by appropriately combining the technical means disclosed in the different embodiments. Is also included in the technical scope of the present invention.

2 Band-shaped member (strip-shaped member for forming a spiral tube)
10 Existing pipe 20 Rehabilitation pipe (spiral pipe)
21 Main body (belt-shaped member main body)
22 Stretched sheet 23 Hollow member 211 Flat plate portion 212 First fitting portion 213 Second fitting portion 214 Telescopic portion 215 Reinforcing rib

Claims (3)

A band-shaped member for forming a spiral tube, which is wound in a spiral shape to form a spiral tube.
The flat plate portion forming the inner surface of the spiral tube, the side that becomes the inner surface of the spiral tube is the inner surface of the spiral tube forming band-shaped member, and the side that becomes the outer surface of the spiral tube is the spiral tube forming band-shaped member. when the rear, is formed by bending so as to protrude to the back side, and the belt-shaped member main body and a telescopic portion extending in the width direction of the spiral tube forming strip,
It has elasticity, and possess an oriented sheet that is stacked so as to cover the elastic portion on the inner surface side of the belt-shaped member main body,
The flat plate portion includes a first flat plate portion on one end side of the telescopic portion and a second flat portion on the other end side of the telescopic portion along the width direction of the spiral tube forming strip-shaped member. Have and
The stretched sheet is a band-shaped member for forming a spiral tube, which is provided from the inner surface of the first flat plate portion to the inner surface of the second flat plate portion . The strip-shaped member for forming a spiral tube according to claim 1.
The stretched sheet is adhesively fixed to the inner surface of the first flat plate portion and the inner surface of the second flat plate portion , and a non-adhesive region is provided around the stretchable portion. A strip-shaped member for forming a spiral tube. A band-shaped member for forming a spiral tube, which is spirally wound to form a spiral tube.
When the side to be the inner surface of the spiral tube is the inner surface of the spiral tube forming band-shaped member and the side to be the outer surface of the spiral tube is the back surface of the spiral tube forming band-shaped member, the side is projected to the back surface side. A band-shaped member body having a stretchable portion formed by bending in a
It has stretchability and has a stretched sheet laminated on the inner surface side of the strip-shaped member body so as to cover the stretchable portion.
A band-shaped member for forming a spiral tube, characterized in that a flexible bag-shaped hollow member is arranged inside the telescopic portion.

Images