JPH10305484A - Method for forming tubular body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute a work easily by preventing a band member from being fractured by a method wherein the band member is formed by heating its surface at a specified temperature. SOLUTION: A band member 100 to be unwound from an unwinder T installed on the ground is sent into an already constructed pipe groove P buried under the ground through a manhole M. It is wound in the already constructed pipe groove with a pipe manufacturing machine 1, and joining parts of both side edge parts are joined to each other to form a lining pipe L. Simultaneously the pipe manufacturing machine 1 is advanced, formed lining pipe L is remained in the already constructed pipe groove P, and lining is executed. Further, a heating device H is installed on this side of the pipe manufacturing machine 1. Then, the band member 100 is passed through the heating device H before it is sent into the pipe manufacturing machine 1, and its surface temperature is heated at 20 deg.C or higher up to and including 80 deg.C. Thereby, a hardness of the band member 100 is lowered, an elongation and an impact resistance are improved, and winding and bonding become easy to be executed. Besides, brittle fracture owing to low temperature of the band member 100 or the formed lining pipe L is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a tubular body on an inner surface of an existing sewer such as a water pipe, a sewer pipe, a gas pipe or the like, and forming the existing sewer with the tubular body (lining pipe). The present invention relates to a method for forming a tubular body in a case of rehabilitation.

[0002]

2. Description of the Related Art When existing sewers such as water pipes, sewer pipes and gas pipes are deteriorated, the sewers are rehabilitated by lining the inner surface of the deteriorated existing sewers with a coating layer of synthetic resin or the like. That is being done. For example, the present applicant has proposed a lining construction method and a construction apparatus for a pipe with a modified cross section as disclosed in JP-A-8-261363.

According to the lining construction method described in the above-mentioned Japanese Patent Application Laid-Open No. 8-261363, a long strip-shaped member having joints formed on both side edges is continuously supplied into a pipe of irregular cross section.
A guide roller disposed on a bendable frame is spirally wound while being in contact with the inner surface as a guide, and then the joining portion is engaged by the clamping action of the inner roller and the outer roller to form a pipe having a modified cross section. A lining tube is continuously formed in the inside.

[0004] The material of the belt-like member used in the above lining construction method, ie, the material of the lining layer is not particularly limited, and various synthetic resins or metal materials can be used. In view of cost, cost, etc., hard vinyl chloride resin is particularly suitable and widely used.

[0005] However, hard vinyl chloride resins have a strong temperature dependency such as tensile strength, elongation, hardness, and impact resistance, and have a drawback that, particularly at low temperatures, the elongation and impact resistance are sharply reduced and become brittle. . Therefore, when processing such as applying a large force, moment or impact to a rigid polyvinyl chloride resin product at low temperatures such as in winter, the processing and handling may be extremely difficult or the material may be damaged. is there.

On the other hand, when lining is performed in an existing sewer by the above-described lining method, a large stress or moment is applied to the band-shaped member or the formed lining pipe due to one or more of the following causes. May occur. That is, since the lining tube is formed by winding the belt-like member while pulling it using the guide rollers provided on the frame as a guide, a large tensile stress is generated in the belt-like member, and the belt-like member is spirally wound. In particular, when the diameter (radius of curvature) is small, a larger tensile stress is applied to the portion on the outer surface side by bending. When pushing the male part of the joint into the female part to fit
A large tensile stress occurs in the female part. Since a certain degree of watertightness is required for the lining pipe, the contact surface pressure between the male part and the female part at the joint must be increased. Therefore, adjacent belt-shaped members are less likely to slide relatively at the joint, and a large tensile stress or torsional stress is generated at the joint. When the guide on which the guide rollers are provided is pulled out of the lining pipe after the lining pipe is formed, the lining pipe is squeezed from the inner surface by the passage of the guide, and a hoop stress to expand the diameter is applied, and the tensile stress on the outer surface side is reduced. It becomes even larger.

[0007] Using a belt-shaped member made of hard vinyl chloride tree,
Even when lining is performed in an existing sewer by the lining method described in JP-A-8-261363, a large stress or moment is generated in the band-shaped member or the joint due to the above-described causes. In some cases, the band-shaped member may be broken, the construction may be extremely difficult, or it may be impossible to continue the construction at all.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art. In particular, at a low temperature, a belt-like member made of a hard vinyl chloride resin is used to form an existing member. A method of forming a tubular body (lining pipe) in a method of forming a tubular body on the inner surface of a sewer and lining the belt-like member without breaking the strip member and without difficulty in construction. With the goal.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a method of continuously forming a long strip of rigid vinyl chloride resin having joints formed at both side edges in a sewer. In a method of lining the inner surface of a sewer by feeding the helical shape and spirally winding and joining abutting joints to form a tubular body in the sewer, the surface temperature of the belt-shaped member is set to 20 ° C. It is characterized by forming a tubular body by heating to a temperature of at least 80 ° C.

[0010] The surface temperature of the belt-like member is 20 ° C or more and 80 ° C.
Or less, preferably 30 ° C. or more and 50 ° C. or less. 20 ° C
If it is less than 3, the elongation and impact resistance are insufficient, so that the tubular body may be broken at the time of formation, or the hardness may be too high to be wound easily, and it may be difficult to form the tubular body. On the other hand, when the temperature exceeds 80 ° C., the elasticity is sharply reduced, so that the so-called “stiffness” is formed, and it is difficult to obtain a lining pipe having a correct cross-sectional shape, or the joint at the joint is loosened. The watertightness of the lining pipe may be reduced. Further, the surface of the band-shaped member is softened, and it is difficult for the band-shaped member to smoothly slide at the joint portion, and the work may be difficult. It is preferable that the surface temperature of the belt-shaped member be higher at the outer surface where the maximum tensile stress is applied by bending during winding than at other portions.

The means for heating the belt-like member is not particularly limited, but includes a method of heating the belt-like member by irradiating an infrared heater, blowing hot air, immersing in hot water, or heating the guide roller or the pinching roller with steam, hot water or heating. A method of heating by circulating oil or the like, and pressing them by heating, etc., is suitably implemented. In addition, if necessary, heat retention may be performed, or local additional heating, reheating, or the like may be performed.

The cross-sectional shape of the tubular body is circular,
Elliptical, square and the like, and in the case of a square, a large stress is generated due to a small radius of curvature of the corner portion, and it is easy to crack, but the surface of the belt-shaped member is softened and the stress is reduced by the present invention, Cracks can be prevented. (Function) The surface temperature of the belt-shaped member when forming the tubular body is 2
By setting the temperature to 0 ° C. or more and 80 ° C. or less, the elastic modulus of the surface portion of the belt-shaped member decreases, and the elongation and the impact resistance increase. As a result, processing such as winding and fitting of a joint portion is facilitated, and the stress and moment generated during the processing are reduced, so that breakage is less likely to occur. In addition, since the heating temperature is 80 ° C. or less for softening the hard vinyl chloride resin, the hard vinyl resin does not soften to a weak state.

[0013]

Embodiments of the present invention will be specifically described below with reference to the drawings. (Embodiment 1) FIG. 1 is an explanatory view showing an embodiment of the method of the present invention, FIG. 2 is a cross-sectional view showing an example of a belt-like member used in the present invention, and FIG. It is a longitudinal section showing an example of a machine.

As shown in FIG. 1, a strip-shaped member 100 unwound from an unwinder T installed on the ground is sent through a manhole M into an existing sewer P buried underground, and the pipe making machine 1 Is wound in the existing sewer P, and the joints of both side edges are joined to form a lining pipe L. At the same time, the pipe-making machine 1 proceeds to the right as shown by the arrow, and the formed lining pipe L The lining is made by remaining in the existing sewer P.

However, a heating device H is installed in the manhole M in front of the tube-making machine 1, and the belt-shaped member 100 passes through the heating device H before being sent to the tube-making machine 1. It is heated so that the surface temperature when it is formed into 20 ° C. or more and 80 ° C. or less.

The belt-shaped member 100 (referred to as A type)
As shown in FIG. 2, the main body 101 has a flat plate shape with a constant thickness, and a concave portion is formed on the outer surface side (upper side of the figure) of the main body 101 as shown in FIG. A ridge 102 having a groove 105 formed therein and having a substantially annular cross section.
a, a long ridge 102b having a substantially I-shaped cross section, a ridge 102c having a substantially inverted L-shaped cross section, and a short ridge 10 having a short I-shaped cross section.
2d are continuously provided in the longitudinal direction. These ridges serve as reinforcing ribs for imparting rigidity to the tubular body when the tubular member is formed by winding the belt-shaped member 100.

The left end of the belt-shaped member 100 (the ridge 10
2a), an obliquely upward projecting portion 103 is extended on the right side (the right side of the ridge 102d).
4 is extended. The left end portion including the ridge 102a and the overhanging portion 103 has a left joining portion 100A, the ridge 10
The right end including the 2d and the inclined edge 104 is the right joint 10.
0B, and the ridge 102d is formed on the ridge 102d.
A tubular body (lining tube) is formed by overlapping the joint 100A on the joint 100B so as to fit the concave groove 105 of FIG. It is configured to be joined without a step. Reference numeral 106 denotes an elastic seal member for ensuring the watertightness of the formed tubular body.

The tube making machine 1 is disclosed in Japanese Patent Application Laid-Open No. 8-261363.
It has basically the same structure as that described in Japanese Patent Publication No. That is, as shown in FIG. 3, a plurality of guide rollers 3 and a joining roller portion composed of a pair of inner rollers 4 and outer rollers 5 driven by a hydraulic motor 7 at 180 ° intervals are provided on the forming frame 2. Have been.

Next, a process of lining the inner surface of an existing sewer using the belt-shaped member 100 shown in FIG. 1 and the pipe making machine 1 shown in FIG. 2 will be described. The pipe-making machine 1 is placed at one end side in an existing pipe P to be lined first. When the belt-shaped member 100 wound around the unwinding machine T is pulled out, passed through the heating device H, and the leading end thereof is sandwiched between the rotating inner roller 4 and the outer roller 5 of the pipe-making machine 1, the belt-shaped member 100 is wound. It is unwound continuously from the unwinding device T. Unwound strip 100
Guide rollers 3 arranged along the forming frame 2
Along the outside thereof, pass through a joining roller portion 6A composed of a drive type inner roller 4 and an outer roller 5 disposed on the forming frame 2, and then guide to a joining roller portion 6B separated by 180 °. Then, when the right joining portion 100B of the leading end portion and the joining portion 100A on the left side of one turn (one pitch) behind the leading end portion are overlapped, the overlapped portion is pressed by the inner roller 4 and the outer roller 5. FIG. 2
As shown in FIG.
A is helically joined to form a short tube.

Subsequently, the inner roller 4 and the outer roller 5
Is driven to rotate, so that the belt-shaped member 1
00 is unwound, and the adjacent right-side joint 100B and the left-side joint 100A, which is one pitch behind, are successively pressed and joined in the same manner as described above, and the strip-shaped member follows the short pipe. 100 are spirally joined. At the same time, the entire pipe making machine 1 revolves in the pipe circumferential direction and moves forward in the direction of arrow A. As a result, the belt-shaped member 100 is continuously wound and joined spirally to form a lining pipe L, and the lining pipe L is left in the existing sewer P, and the inner surface of the existing sewer P is lined. .

In the above process, when the ambient temperature is as low as 20 ° C. or less, or when the surface temperature of the belt-shaped member 100 at the time of forming the lining tube L is at or below a desired temperature, the heating device H causes Heating is performed so that the surface temperature of the band-shaped member 100 when the body is formed is a desired temperature of 20 ° C. or more and 80 ° C. or less. Thereby, the belt-shaped member 10
The hardness of the belt-like member 100 or the formed lining tube L is prevented from being brittlely broken at low temperature while the hardness and hardness of the belt-like member 100 are reduced, the flexibility and elongation and impact resistance are improved, and the winding and joining are facilitated. Is done.

(Embodiment 2) FIG. 4A is a cross-sectional view showing another example of the band-shaped member used in the present invention, FIG. 4B is a perspective view showing how the band-shaped member is joined, and FIG. It is a longitudinal cross-sectional view which shows another example of a pipe-making machine.

A band member 200 (referred to as a B type) shown in FIG. 4 is composed of a combination of a main member (main band member) 201 and a fitting member 202. The main material 201 is formed by extrusion molding of a hard vinyl chloride resin.
a and a groove 201b, and a joint 201
A and 201B are formed, and the adjoining joint 20 is formed.
1A and 201B are abutted against each other to form a fitting groove 2
01C is formed.

The fitting member 202 is also made by extrusion molding of the same hard vinyl chloride resin. The fitting material 202 has a fitting ridge 202a that resiliently fits into a fitting groove 201C formed by the main material 201, and is formed by joining portions 201A and 201B of the main material 201 arranged side by side. By fitting the fitting member 202 into the fitted fitting groove 201C, the main members 201 on both sides that are abutted are joined.

The pipe making machine 8 shown in FIG. 5 is fixedly installed at one end of a pipe Pa. The inner roller 9 and the outer roller 10 are supported as a set by a shaft on the forming frame 11, and the set of the inner roller 9 and the outer roller 10 can be any of the forming frame 11 according to the inner diameter of the existing pipe P. Can be fixed on the circumference. And the inner roller 9 and the outer roller 1
Numeral 0 is connected to the electric motor 14 via the drive belts 12 and 13, respectively, and rotates in opposite directions. The outer surface of the outer roller 10 has such a shape that it can be engaged with the main member 201 and the fitting member 202 at the same time, and can be pressed while being simultaneously fed.

In the tube making machine 8, a heating device Ha is installed in front of the tube making device 8, and both the main member 201 and the fitting member 202 pass through the heating device Ha before being sent to the tube making device 8. It is configured as follows.

Next, a process of lining the inner surface of an existing culvert using the strip member 200 shown in FIG. 4 and the pipe making machine 8 shown in FIG. 5 will be described. The main material 201 wound on an unwinder (not shown) is spirally wound while being pulled out by the inner roller 9 and the outer roller 10. And the joint 201B
When the joining portion 201A at the back of one round (one pitch) is abutted, a fitting groove 201C is formed.

Similarly, the fitting member 202 wound around the unwinding machine (not shown) is pulled out by the inner roller 9 and the outer roller 10 and squeezed to form the fitting groove 201 formed as described above.
By fitting into C, the joining portions 201A and 201B of the main material 201 that are in contact with each other are joined. The main material 2
Numeral 01 is continuously joined spirally by a fitting member 202 to form a lining pipe La, and the inner surface of the existing sewer Pa is lined.

Also in the process of the second embodiment, the main member 201 when the tubular body is formed by the heating device Ha.
The heating is performed so that the surface temperature of the fitting member 202 becomes a desired temperature of 20 ° C. or more and 80 ° C. or less. The main material 2
01 and the fitting material 202 are reduced in hardness and become flexible, elongation and impact resistance are improved, winding and joining are facilitated, and the main material 201, the fitting material 202, or the formed lining are formed. The tube La is prevented from brittle fracture due to low temperature.

(Embodiment 3) FIG. 6 is a front view showing still another example of the tube making machine, and FIG. 7 is a longitudinal sectional view of a pair of inner rollers and outer rollers for pinching.

The tube making machine 15 shown in FIG. No. 1 roller, No. No. 2 roller, No. It has three pairs of pressing rollers of three rollers, and each pressing roller comprises an inner roller 16 and an outer roller 17, as shown in FIG. No. The roller No. 1 feeds the belt-shaped member 100 (same as that shown in FIG. 2). No. 2 roller and No. 2 The three rollers are rollers for spirally winding the fed belt-shaped member 100, overlapping the joints, and pressing.

As shown in FIG. 7, an inner roller 16 and an outer roller 17 are provided with an electric heater 18 having a heating wire wound inside.
When the electric heater 18 is energized from an external power source, the electric heater 18 generates heat and the inner roller 1 is heated.
6 and the outer roller 17 are heated, and the surface of the belt-shaped member 100 (same as that shown in FIG. 2) in contact with the inner roller 16 and the outer roller 17 is heated. The amount of heat generated by the electric heater 18 can be adjusted by a variable resistor (not shown), so that the surface temperature of the belt-shaped member 100 can be heated to a desired temperature.

The tube making machine 15 shown in FIG. It is considered that the largest stress and moment occur at the two rollers. No. 1 roller preheats. It is considered effective to perform full-scale heating with two rollers. However, depending on the ambient temperature, the state of the wind, the positional relationship between the rollers, etc., heating with only one pair of rollers, 1 to No. (3) Heating by all rollers may be performed.

FIG. 8 is a longitudinal sectional view showing another example of the pressing roller. A heating oil passage 22 is provided inside the inner roller 19 and the outer roller 20, and heating oil supplied from an oil heater (not shown) flows into the inner roller 19 and the outer roller 20 through a roller shaft 21. The inner roller 19 and the outer roller 20 are heated by flowing through the heating oil flow path 22.

Hereinafter, specific examples of the present invention will be described. (Examples 1 to 4) Using a pipe making machine 1 shown in FIG. 3, a belt-shaped member 100 made of an A-type hard vinyl chloride resin having a ridge height h ₁ of about 21.5 mm was spirally wound. Inner diameter 1000
A lining pipe having a length of 10 mm and a length of 10 mm was produced. The ambient temperature was −10 ° C., but the surface temperature of the belt-shaped member at the time of pipe production was 20 ° C. or more by immersing in hot water or blowing hot air.
It heated so that it might be below ° C. The pipe making speed is 15c
m / min. Then, for each example, the strip-shaped members and the joints during and after the pipe-forming process were inspected for cracks, breaks, deformations, and other abnormalities.

(Examples 5 to 8) Using a pipe making machine 7 shown in FIG. 5, a belt-shaped member 100 made of a hard vinyl chloride resin of B type having a ridge height h ₂ of about 8 mm is spirally wound. , Inner diameter 2
A 50 mm lining tube was made. Heating was performed so that the surface temperature of the belt-shaped member at the time of pipe production was 20 ° C or higher and 80 ° C or lower. In addition, the pipe production speed was 30 cm / min. And
In each of the examples, the presence or absence of an abnormality during and after the pipe making process was inspected in the same manner as in Examples 1 to 4.

(Embodiment 9) Using the tube making machine 15 (electric heating type) shown in FIG. 1 roller and no. Both the inner roller 16 and the outer roller 17 of the two rollers are heated so that the surface temperature of the belt-shaped member at the time of pipe production becomes 20 ° C., and the height h _{1 of the} ridge is about 21.5 mm. A belt member 100 made of hard vinyl chloride resin is spirally wound, and has an inner diameter of 1000.
A lining pipe having a length of 10 mm and a length of 10 mm was produced. The outside air temperature was 0 ° C., and the tube production speed was 30 cm / min. Then, in the same manner as in Examples 1 to 4, the presence or absence of an abnormality during and after the pipe making process was inspected.

(Comparative Examples 1 and 2) The same method as in Examples 1 to 4 was used, except that the unheated band member and the band member heated at a surface temperature of 80 ° C. or more during pipe production were used.
A 000 mm lining tube was made. Then, for each of the comparative examples, similarly to Examples 1 to 4, the presence or absence of abnormalities during the pipe making process and after the pipe making was inspected.

(Comparative Examples 3 and 4) The same method as in Examples 5 to 8 was used except that the unheated band member and the band member heated at a temperature of 80 ° C. or more during pipe production were used.
A 50 mm lining tube was made. Then, for each of the comparative examples, similarly to Examples 1 to 4, the presence or absence of abnormalities during the pipe making process and after the pipe making was inspected.

(Comparative Example 5) 1 to No. A lining tube having an inner diameter of 1000 mm was produced in the same manner as in Example 9 except that none of the three rollers was heated. Then, in the same manner as in Examples 1 to 4, the presence or absence of an abnormality during and after the pipe making process was inspected.

The above results are summarized in Table 1.

[0042]

[Table 1]

As shown in Table 1, when the surface temperature of the belt-like member at the time of pipe-forming was heated so as to be 20 ° C. or more and 80 ° C. or less, the band-like member during the pipe-forming process and after the pipe-forming were joined. No cracks, breaks, deformations or other abnormalities were observed in the part. However, the surface temperature of the belt-like member during pipe production is 20
If the temperature is lower than 80 ° C (not heated), cracks will occur and
In the above case, deformation occurred, and a lining tube could not be obtained.

[0044]

As is apparent from the above description, the belt-shaped member is spirally wound in a pipe and joined to form a tubular body.
In the method of lining the inner surface of the sewer, by forming the tubular body according to the present invention, the hardness of the surface portion of the band-shaped member is reduced, and the elongation and impact resistance are increased, so that the band-shaped member is not broken, Winding and joining of the joining portion are facilitated. Moreover, there is no possibility that the belt-shaped member is excessively softened and deformed.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing an example of a belt-shaped member used in the present invention.

FIG. 3 is a longitudinal sectional view showing an example of a pipe making machine used in the present invention.

4A is a cross-sectional view showing another example of the belt-shaped member used in the present invention, and FIG. 4B is a perspective view showing a method of joining the belt-shaped members.

FIG. 5 is a longitudinal sectional view showing another example of the tube making machine used in the present invention.

FIG. 6 is a front view showing still another example of the tube making machine used in the present invention.

7 is a vertical sectional view of an inner roller and an outer roller for pinching of the tube making machine shown in FIG. 6;

FIG. 8 is a longitudinal sectional view showing another example of the inner roller and the outer roller for clamping.

[Explanation of symbols]

 1,8,15 Tube making machine 2,11 Forming frame 3 Guide roller 4,9,16,19 Inner roller 5,10,17,20 Outer roller 6A, 6B Joining roller section 18 Electric heater 22 Heating oil flow path 100, 200 Band-shaped member 100A, 100B Joint 201 Main material 201A, 201B Joint 201C Fitting groove 202 Fitting H, Ha Heating device L, La Lining pipe P, Pa Existing pipe

Claims (1)

[Claims] 1. A long strip of rigid vinyl chloride resin having joints formed at both side edges is continuously supplied into a duct and spirally wound to join joints that are in contact with each other. In the method of lining the inner surface of a sewer by forming a tubular body in the sewer, forming the tubular body by heating the surface temperature of the belt-shaped member to a temperature of 20 ° C or more and 80 ° C or less. A method of forming a characterized tubular body.