JP2004162752A - Regeneration structure and regeneration method for conduit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a regeneration structure and a regeneration method for a conduit enabling inexpensive regeneration of the flat conduit while holding predetermined mechanical strength. <P>SOLUTION: A regeneration self-standing pipe 1 formed by a hardening regeneration member E and having substantially complete round cross section is formed on an inner side of an existing underground pipe F to be regenerated irrespective of a shape of an inner wall of the underground pipe F. A withstand pressure material 4 is filled and fixed in a clearance caused between the regeneration self-standing pipe 1 and the underground pipe F. The flexible and cylindrical regeneration member E in which hardening resin is impregnated is mounted on the inner side of the existing underground pipe F. Internal pressure is applied from the inner side of the regeneration member E and the regeneration self-standing pipe 1 is formed by causing a clearance 3 in at least a part on a cross section in the direction in which an internal wall 2 and the regeneration member E cross the axial direction orthogonally while maintaining substantially complete round irrespective of the shape of the inner wall of the underground pipe F. Then, the withstand pressure material 4 having fluidity is filled and fixed in the clearance 3 caused in outer surroundings of the regeneration self-standing pipe 1. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a rehabilitation structure and a rehabilitation method of a pipeline when reinforcement is required with an underground pipe or the like that is flattened due to earth pressure, wheel pressure, or the like, or an existing underground pipe or the like.
[0002]
[Prior art]
When cracks occur in the body of underground pipes such as sewage pipes due to aging, earthquakes, land subsidence, etc., or the connection parts are displaced, new pipelines are formed inside old underground pipes. Rehabilitation (including repair) methods are widely practiced.
[0003]
As a method for rehabilitating such a pipeline, a flexible rehabilitation material impregnated with a curable material is used, and the rehabilitation material is cured while applying internal pressure to the rehabilitation material from the inside of the old pipeline to form a new rehabilitation pipeline. A method for rehabilitating a pipe to be formed is known (for example, see Non-Patent Document 1 and Patent Document 1).
[0004]
In such a pipe rehabilitation method, for example, as shown in FIG. 8, a rubber sleeve C is provided outside a cylindrical body B having a substantially circular cross-sectional shape (a cross section perpendicular to the axial direction). A packer A having an air supply pipe D for supplying air between the sleeve C and the cylindrical body B is used.
[0005]
When air is supplied from the air supply pipe D using such a packer A, the sleeve C expands, and the rehabilitating material E wound on the outer periphery of the sleeve C is pressed against the inner surface of the underground pipe F. By heating the rehabilitation material E, the thermosetting resin contained in the rehabilitation material E is cured. If the air between the sleeve C and the cylindrical body B is released after the rehabilitating material E is cured, the sleeve C contracts and separates from the rehabilitating material E. Thereafter, the packer A is pulled up to the ground, and the rehabilitation work of the underground pipe F is completed, and a new pipeline is formed. Here, if a material having sufficient mechanical strength is used as the rehabilitating material E, the rehabilitating self-standing tube 1 as a new pipeline is formed.
[0006]
[Non-patent document 1]
"Special Issue: Development of Sewer Pipeline Maintenance (Rehabilitation); All-Liner Method-Responding to All Needs-", written by Katsunori Otsuka, Katsumi Nakamura and Nobuhiko Onoda, All Liner Association Press, December 2000, p. 1-7
[Patent Document 1]
JP-A-7-77296 (FIG. 6, left column of page 2)
[0007]
[Problems to be solved by the invention]
However, according to the method of applying the internal pressure to the rehabilitating material E from the inside of the old pipeline using the packer A and hardening the rehabilitating material E to rehabilitate the pipeline, the underground pipe F causes the earth pressure such as earth fog pressure or the like. Accordingly, in the case of flattening as shown in FIG. 9, a flattened rehabilitated self-standing pipe 1 ′ is formed along the inner wall of the underground pipe F as shown in FIG. 10.
[0008]
Here, in the rehabilitation self-standing pipe 1 ′ which is flattened in an elliptical shape as shown in FIG. 10, the pressure resistance in the vertical direction is lower than that of the rehabilitation self-standing pipe 1 having a substantially circular cross section. Therefore, when it is necessary to lay a self-supporting rehabilitating pipe having a predetermined wheel pressure, it is necessary to adopt a material having excellent rigidity as the rehabilitating material E or to increase the thickness of the rehabilitating material E. Rehabilitating material E having excellent rigidity is expensive. In addition, when the thickness of the rehabilitating material E is increased, there is a problem that, in addition to the material height, there is also a high construction cost due to a decrease in workability, and the overall price increases.
[0009]
For example, according to trial calculations by the present inventors, when forming a substantially round rehabilitation self-standing pipe 1 in a fume pipe (inner diameter 1350 mm, outer diameter 1400 mm) having a nominal diameter of 1350 mm, soil fog is 5 m and groundwater level is 0 m, using a wheel load type T-25, flexural strength 40N / mm ² of rehabilitating material E, allowable stress 20 N / mm ^2, designed elastic modulus 1750 N / mm ^2, the safety factor 2, requests the thickness of rehabilitating material against groundwater pressure The thickness is calculated to be 11.5 mm, the thickness with respect to the earth pressure is calculated to be 17.5 mm, and as a result, the required thickness of the rehabilitating material E is 17.5 mm.
[0010]
On the other hand, as an example of forming the flat rehabilitated self-standing pipe 1 ′, for example, in a pipe with a flatness of 10% (pipe diameter 1500 mm, vertical distance 1350 mm, horizontal distance 1650 mm), substantially the same condition, that is, soil fog the 5 m, the groundwater level assumed 0 m, the wheel load type T-25, bending using a rehabilitating material E strength 40N / mm ^2, the allowable stress 20 N / mm ^2, designed elastic modulus 1750 N / mm ^2, the safety factor 2 , The thickness with respect to the earth pressure is calculated to be 35.98 mm, and as a result, the required thickness of the rehabilitating material E is 37 mm. Here, the larger value of the values obtained from the Marston formula and the vertical formula is used for the calculation of the soil fog pressure.
[0011]
Such a problem is required in rehabilitation of a pipeline under a highway where wheel pressure is large. The request from the road manager to rehabilitate the pipeline is to secure a pipeline with a predetermined cross-sectional area and rehabilitate the pipeline with a predetermined mechanical strength at low cost.
[0012]
Accordingly, an object of the present invention is to provide a rehabilitation structure and a rehabilitation method of such a flat pipeline which can rehabilitate the pipeline at a low cost while maintaining a predetermined mechanical strength.
[0013]
[Means for Solving the Problems]
The invention according to claim 1 is a self-standing rehabilitating pipe having a substantially circular cross section formed of a hardening rehabilitating material inside an existing underground pipe to be rehabilitated, regardless of the shape of the inner wall of the underground pipe. And a gap formed between the self-supporting free-standing pipe and the underground pipe is filled with a pressure-resistant material and fixed, and is fixed.
[0014]
According to a second aspect of the present invention, a flexible tubular rehabilitating material impregnated with a curable resin is loaded inside an existing underground pipe, and an internal pressure is applied from the inside of the rehabilitating material to the ground. Regardless of the shape of the inner wall of the middle pipe, the inner wall and the rehabilitating material are at least partially opened in a cross section in a direction orthogonal to the axial direction of the underground pipe while maintaining a substantially perfect circle, and at least a part of the inner wall and the rehabilitating material are rehabilitated independently. A method for rehabilitating a pipe line, characterized in that after forming the pipe, a gap formed around the outside of the rehabilitation free-standing pipe is filled with a fluid pressure-resistant material and fixed.
[0015]
With this configuration, the rehabilitated freestanding pipe has a substantially circular cross-sectional shape. For example, even when the pipe is thinner than a flat ellipse, it is possible to secure the mechanical strength required for the rehabilitated freestanding pipe. Can be. In addition, since the gap between the rehabilitated freestanding pipe and the underground pipe is filled with a pressure-resistant material, even if a load is applied to the rehabilitated freestanding pipe in the vertical direction, the load is transmitted through the rehabilitated freestanding pipe and dispersed. Further, since it is supported by the surrounding pressure-resistant material, the mechanical strength is further increased.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0017]
First, in the pipe rehabilitation structure of the present invention, an existing flat underground pipe F to be rehabilitated as shown in FIG. 9 is rehabilitated.
[0018]
Inside the underground pipe F, as shown in FIG. 1, a new rehabilitated self-standing pipe 1 having a substantially perfect circular cross section formed from a hardening rehabilitating material E is formed. As a result, a gap 3 is formed between the rehabilitated freestanding pipe 1 and the inner wall 2 of the underground pipe F. This gap 3 is filled with a pressure-resistant material 4 as shown in FIG. The pressure-resistant material 4 is preferably a material that is harder than the surrounding soil, and examples thereof include an inorganic curable material such as mortar.
[0019]
Here, the cross-sectional shape of the underground pipe F in FIG. 1 shows a clean ellipse, but the cross-sectional shape of the underground pipe F is not limited to such a clean ellipse and may be deformed. The present invention is characterized in that, regardless of the cross-sectional shape of the inner wall 2 of the underground pipe F to be rehabilitated, the cross-sectional shape forms the rehabilitation self-standing pipe 1 having a substantially perfect circle. When such a rehabilitated self-standing pipe 1 having a substantially perfect circle is formed, if it is made of the same material and has the same thickness as the elliptical rehabilitated self-standing pipe 1 ′, it can withstand large earth pressure and wheel pressure.
[0020]
Further, in the present invention, for example, as shown in FIG. 3, there may be a distance d between the top upper surface of the rehabilitated freestanding pipe 1 and the top lower surface of the underground pipe F. Also in this case, the surrounding gap 3 is filled with a pressure-resistant material 4 as shown in FIG. As described above, by reducing the diameter of the rehabilitated free-standing pipe 1, if the thickness of the rehabilitated self-standing pipe 1 is the same, the pressure-resistant material filled in the gap has a higher strength, so that the mechanical strength is further increased. be able to. As long as the effective cross-sectional area within a predetermined pipeline can be ensured even if the diameter of the rehabilitated self-standing pipe 1 is reduced, the smaller the diameter of the rehabilitated self-standing pipe 1, the less the material cost. Thus, it is possible to provide a pipe rehabilitation structure that can rehabilitate a flat pipe at low cost while maintaining a predetermined mechanical strength.
[0021]
Next, an example of a method of rehabilitating the rehabilitation self-standing pipe 1 having such a configuration and a method of obtaining a rehabilitation structure of a pipeline will be described.
[0022]
The apparatus shown in FIG. 8 is used except that an apparatus whose diameter is smaller than the short diameter of the flat underground pipe F is used. Here, an air heater or the like (not shown) is disposed in the air supply pipe D so that air sent from a compressor (not shown) can be heated.
[0023]
As the rehabilitating material E, a tubular fibrous base material impregnated with a thermosetting resin and having a small expandability even when the pressure in the sleeve is increased is selected. By supplying warm air to the air supply pipe D, the rehabilitating material E receives an inflation pressure toward the outside by the sleeve C. However, since a base material having a small inflation property is selected, the cross-sectional shape becomes substantially circular. Become. When the hot air is blown into the sleeve C in a state where the cross-sectional shape maintains a substantially perfect circle, the rehabilitating material E is hardened while maintaining the substantially perfect circle.
[0024]
By discharging the air between the sleeve C and the cylindrical body B, the rehabilitated self-standing pipe 1 having a substantially perfect cross section is formed in the underground pipe F. This rehabilitated self-standing pipe 1 is formed, for example, as shown in FIG. 1 (or FIG. 3) regardless of the shape of the inner wall of the underground pipe F and the inner diameter of the underground pipe F. The gap (gap) 3 is filled with a fluid pressure-resistant material such as mortar, concrete, or a compound emulsion of an inorganic main material, for example, by using a hose having a small diameter enough to enter the gap 3 and solidified. As shown in FIG. 2 (or FIG. 4), a rehabilitation structure of the underground pipe F can be obtained.
[0025]
Next, an example of the configuration of such a rehabilitating material E will be described with reference to FIGS. In these drawings, the rehabilitating material E is shown as an arc forming a part of a substantially perfect circle, but this is for the sake of convenience of explanation of the structure, and The material E can be flattened and wound into a roll, or stored in a folded state, or transferred to a work site.
[0026]
First, FIG. 5 is a partial sectional view showing an example of the rehabilitating material E. The outer periphery of the fibrous base material 5 for the rehabilitated self-standing pipe impregnated with the thermosetting resin is covered with a cylindrical restricting member 6 for restricting the expansion of the fibrous base material 5.
[0027]
Here, the restricting member 6 shown in FIG. 5 is, for example, a cylindrical body reinforced by a reinforcing fiber (for example, glass fiber or the like) having a small elongation in the circumferential direction, or a cylindrical sheet having high mechanical strength. It is made of a material or the like, and covers the fibrous base material 5 from outside to restrict the fibrous base material 5 from expanding due to internal pressure. The restriction member 6 may be fixed to the fibrous base material 5 with an adhesive or the like.
[0028]
Further, in this modified example of the rehabilitating material E, as shown in FIG. 6, the restricting member 6 is embedded in the fibrous base material 5. Also in this case, the tubular fibrous base material 5 expands into a cylindrical shape by applying the internal pressure, but the expansion is suppressed at a predetermined diameter by the action of the restricting member 6. If the fibrous base material 5 itself is a non-expandable base material, the restricting member 6 may or may not be provided.
[0029]
In addition, as for these rehabilitating materials E, if the cross section in the direction orthogonal to the axis is a substantially perfect circle, the diameter of the circle may change in the axial direction. Although the fibrous base material 5 is shown as a single layer for simplicity, the fibrous base material 5 may have a multilayer structure in which two to five layers of a fibrous base material and a sheet or film are laminated. Further, the resin component to be impregnated is a thermosetting resin or a photocurable resin, and any resin component can be freely selected.
[0030]
[Modification]
In the above embodiment, the thermosetting resin is cured by the heated air. However, when a material having a long length in the longitudinal direction is used as the rehabilitating material E, it is better to use steam than the heated air. There is. In this case, a steam introducing means for introducing steam is necessary, but it is preferable to further provide a drain pumping means for pumping drain generated by condensation.
[0031]
For example, as shown in FIG. 7, the underground pipe F to be rehabilitated is a pipe for collecting rainwater such as a highway, from a road surface discharge portion 7 formed along the longitudinal direction of both sides of the highway. This is a rainwater pipe formed to be inclined toward the central junction pipe 8. One section of the underground pipe F is deformed flat by the earth pressure as shown in FIG. In addition, in this figure, the underground pipe F has substantially the same pipe diameter in the longitudinal direction, but the pipe diameter may be changed by waving in the longitudinal direction.
[0032]
The rehabilitating material E is a flexible tubular material that is long in the axial direction and formed of an air-impermeable material having a sectional structure as shown in FIG. 5 or FIG. Even when the rehabilitating material E is expanded by applying an internal pressure, the relationship with the inner diameter of the underground pipe F, as shown in FIG. 1 or FIG. Is smaller or equal to the outer diameter.
[0033]
The tip 9 of the rehabilitating material E is sealed by an appropriate technique. Such a rehabilitating material E can be laid in the underground pipe F by, for example, an inversion method. Of course, it may be laid by pulling with a rope or the like. By arranging the tip 9 so as to reach the merging pipe 8, the rehabilitating self-standing pipe 1 can be formed along the longitudinal direction of the underground pipe F.
[0034]
One end of the rehabilitating material E located on the road surface discharge portion 7 side is sealed by, for example, a sealing plug 10. The sealing plug 10 is provided with a pressure-resistant and heat-resistant supply hose 11 and a flexible pressure-resistant discharge hose 12 for discharging the drain collected inside. The supply hose 11 supplies air (air) to the inside of the rehabilitating material E to expand the rehabilitating material E into a substantially perfect circle, and supplies steam to cure the rehabilitating material E.
[0035]
Thus, air is supplied from the supply hose 11 to rehabilitate the renewed material E so that its cross section perpendicular to the axial direction becomes, for example, approximately 0.07− so that it becomes a substantially perfect circle as shown in FIG. 1 (or FIG. 3). An internal pressure of about 0.08 pa is applied. Next, while the internal air is being discharged from the discharge hose 12, steam having the same pressure is introduced from the supply hose 11 to heat the rehabilitating material E. The drain generated by condensation is discharged from the tip of the discharge hose 12. Since the discharge hose 12 is flexible, the drain can be spontaneously discharged by the internal pressure by arranging the distal end in the retaining portion 13 where water (drain) is retained.
[0036]
After the hardening is completed for a predetermined time, the gap 3 between the rehabilitated self-standing pipe 1 and the underground pipe F is filled with a filler material (pressure-resistant material 4) such as mortar and hardened, so that the underground pipe F Inside, a rehabilitation self-standing tube 1 as shown in FIG. 2 (or FIG. 4) can be formed. The tip 9 and the like can be cut open by a known method to rehabilitate the junction with the merging pipe 8 or the road surface discharge portion 7.
[0037]
In this manner, a flexible tubular rehabilitation material impregnated with a curable resin is loaded inside the existing flat underground pipe, and internal pressure is applied from the inside of the rehabilitation material to form an inner wall of the pipe. Regardless of the shape of the rehabilitated pipe, after forming a rehabilitated pipe with a substantially perfect circle, the extra space around the rehabilitated pipe is filled with pressure-resistant material and hardened. Regardless of the shape of the inner wall of the underground pipe inside the pipe, a gap formed between the rehabilitated freestanding pipe and the underground pipe, which forms a rehabilitated freestanding pipe with a substantially circular cross section formed from the hardening material A rehabilitation structure of a pipeline in which a pressure-resistant material is filled and fixed is provided.
[0038]
With such a configuration, the rehabilitated self-standing pipe has a substantially circular cross section, so that the mechanical strength required for the rehabilitated self-standing pipe can be ensured even if the pipe is thinner than a flat ellipse. In addition, since the gap between the rehabilitated freestanding pipe and the underground pipe is filled with a pressure-resistant material, even if a load is applied to the rehabilitated freestanding pipe in the vertical direction, the load is transmitted through the rehabilitated freestanding pipe and dispersed. Further, since it is supported by the surrounding pressure-resistant material, the mechanical strength is further increased.
[0039]
In the above-described embodiment, the rehabilitating material E mainly impregnated with a thermosetting resin is used, but may be impregnated with a photocurable resin. Further, these curable resins are not limited to impregnation and may be applied.
[0040]
Further, a method of making the rehabilitating material E substantially round is also free. For example, when the diameter of the rehabilitation free-standing pipe 1 is small (for example, 250 mm or less), a liquid may be used instead of gas as a medium for making the rehabilitation material E a substantially perfect circle. If warm water is used, the thermosetting resin can be heated and cured while maintaining a substantially perfect circle.
[0041]
Further, in the above embodiment, the flat underground pipe is rehabilitated. However, as shown in FIG. 8, the rehabilitation self-standing pipe 1 is formed in the underground pipe having a rectangular cross section. You may.
[0042]
In the above description, the underground pipe has been rehabilitated. However, the rehabilitation structure and rehabilitation method of the pipeline according to the present invention include a repair structure, a reinforcement structure, a rehabilitation method, and a reinforcement method of an underground pipe. .
[0043]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a pipe rehabilitation structure and a rehabilitation method capable of rehabilitating pipes at low cost while maintaining predetermined mechanical strength.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view illustrating a rehabilitation structure of an underground pipe according to the present invention.
FIG. 2 is a cross-sectional view illustrating a rehabilitation structure of an underground pipe according to the present invention.
FIG. 3 is a sectional view illustrating a rehabilitation structure of an underground pipe according to the present invention.
FIG. 4 is a cross-sectional view illustrating a rehabilitation structure of an underground pipe according to the present invention.
FIG. 5 is a partial cross-sectional view of a rehabilitating material used in the underground pipe rehabilitation method according to the present invention.
FIG. 6 is a partial sectional view of a rehabilitating material used in the method of rehabilitating an underground pipe according to the present invention.
FIG. 7 is a schematic diagram illustrating a section of a method of rehabilitating an underground pipe according to the present invention.
FIG. 8 is a schematic diagram illustrating a method of rehabilitating an underground pipe according to a conventional example and the present invention by using cross sections.
FIG. 9 is a cross-sectional view illustrating a rehabilitation structure of an underground pipe according to a conventional example.
FIG. 10 is a cross-sectional view illustrating a rehabilitation structure of an underground pipe according to a conventional example.
[Explanation of symbols]
A: Packer B: Cylindrical body C: Sleeve D: Air supply pipe E: Rehabilitation material F: Underground pipe 1: Rehabilitation self-standing pipe 1 ': (flat) rehabilitation self-supporting pipe 2: Inner wall 3: void (gap)
4: pressure-resistant material 5: fibrous base material 6: restricting member 7: road surface discharge portion 8: merging tube 9: tip 10: sealing plug 11: supply hose 12: discharge hose 13: staying portion

Claims (4)

Inside the existing underground pipe to be rehabilitated, irrespective of the shape of the inner wall of the underground pipe, a rehabilitation self-standing pipe formed of a hardening rehabilitating material and having a substantially circular cross section is formed. A pressure-resistant material is filled in and fixed to a gap formed between the pipe and the underground pipe. A flexible tubular rehabilitation material impregnated with a curable resin is loaded inside an existing underground pipe, and an internal pressure is applied from the inside of the rehabilitation material to affect the shape of the inner wall of the underground pipe. In a state in which the inner wall and the rehabilitating material are maintained in a substantially perfect circle, at least a part of the inner wall and the rehabilitating material are formed with a gap in a cross section perpendicular to the axial direction of the underground pipe to form a rehabilitating self-standing pipe. A method for rehabilitating a pipeline, characterized in that a gap formed around the outside of the self-standing pipe is filled with a fluid pressure-resistant material and fixed. 3. The method according to claim 2, wherein the medium for applying the internal pressure is a gas. The method of claim 3, wherein the rehabilitating material is a fibrous material impregnated with a thermosetting resin, and is cured by being heated by steam.

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