JP2008185058A - Bypass hose used for existing pipe regeneration method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To regenerate an existing pipe by securing quality by sufficiently heating and pressurizing a regeneration pipe without degrading workability, in a regeneration method for regenerating an existing pipe while running down sewage or the like by selectively using two types of bypass hoses. <P>SOLUTION: The upstream side of a lining part of the existing pipe K is blocked; a drain system by a water pump P for the blocked sewage or the like is branched into two systems; a first bypass hose 11 is connected to one-side system and inserted into the existing pipe K; the regeneration pipe 10 is introduced into the existing pipe K while the sewage or the like is run down to the downstream side of the existing pipe K through the first bypass hose 11; thereafter a second bypass hose 12 is inserted into the regeneration pipe 10 and connected to the other-side system; and the regeneration pipe 10 is heated and pressurized and lined in the existing pipe K while running down the sewage or the like to the downstream side of the existing pipe K through the second bypass hose 12. Then, the bypass hoses 11 and 12 are formed by stacking a heat insulation layer on an outer peripheral surface of an inner layer hose. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a bypass hose used in a rehabilitation method for lining a correction pipe to an existing pipe such as an aged sewer pipe.

  Conventionally, a rehabilitation pipe made of thermoplastic resin such as vinyl chloride, which is smaller in diameter than the inner diameter of an existing pipe and recovers to a circular pipe shape at a shape memory temperature, in an existing pipe such as a sewer pipe buried underground. A rehabilitation method has been proposed and widely practiced in which a rehabilitation pipe is heated to restore a circular pipe shape and then pressurized to expand and expand the diameter, and the rehabilitation pipe is lined to the inner peripheral surface of the existing pipe. (For example, refer to Patent Document 1).

  In such a rehabilitation method, when the rehabilitation pipe is lined while sewage is flowing through the existing pipe, the rehabilitation pipe is cooled by the sewage, etc., so that the temperature rise is insufficient in the process of heating the rehabilitation pipe. May be. Insufficient heating of the rehabilitation pipe may cause damage when the rehabilitation pipe is restored to the shape of a circular pipe, or when the softened rehabilitation pipe is expanded and expanded in diameter and brought into close contact with the inner peripheral surface of the existing pipe. There is a high possibility of a complete finish.

  For this reason, the rehabilitation method described above cannot be performed in an environment where sewage or the like flows down, and must be bypassed so that the sewage or the like does not flow down the rehabilitation pipe. Specifically, it is necessary to carry out a water change work for laying a bypass pipe on the road between the start side manhole and the arrival side manhole to bypass the sewage. As a result, there is a problem that not only the construction takes time but also traffic congestion is caused by the traffic regulation accompanying the laying of the bypass pipe.

As a method for improving the correction method that requires such a water change operation, a method of flowing sewage or the like through a lining portion of an existing pipe to the downstream side has been proposed. For example, weir the upstream of the existing pipe lining, divide the drainage system by a water pump such as sewage, etc. into two systems, and connect the first bypass hose inserted into the existing pipe lining to one system. The sewage is led to the downstream of the lining portion of the existing pipe through the water pump and the first bypass hose, and the second pipe is drawn into the lining portion of the existing pipe while flowing down through the first bypass hose. Insert the bypass hose and connect it to the other system, guide the sewage etc. downstream of the lining part of the existing pipe through the water pump and the second bypass hose, and heat and pressurize the correction pipe while flowing down through the second bypass hose. And lining the existing pipe (for example, see Patent Document 2).
Japanese Patent Laid-Open No. 11-230212 JP 2000-185350 A

  In such a rehabilitation method, heat resistance is required for the bypass hose described above, but when using an existing heat resistant pipe material for the bypass hose, the bypass hose made of heat resistant pipe material is hard and heavy, The workability at the time of pulling in or pulling out the bypass hose is lowered. Moreover, when a bypass hose made of heat-resistant pipe material is inserted into the correction pipe and sewage flows down, the sewage and the renewal pipe exchange heat through the bypass hose contacting the correction pipe, and the correction pipe is cooled. . For this reason, the temperature rise becomes insufficient in the process of heating the rehabilitation pipe, and when the rehabilitation pipe is restored to a circular pipe shape, or the softened rehabilitation pipe is pressurized to expand and expand, and the inner peripheral surface of the existing pipe When in close contact with the surface, there is a risk of an incomplete finish.

  The present invention has been made in view of such problems, and in a rehabilitation method for rehabilitating an existing pipe while allowing sewage or the like to flow down selectively using two bypass hoses, without reducing workability. The present invention provides a bypass hose for use in an existing pipe rehabilitation method that can sufficiently heat and pressurize a rehabilitation pipe and rehabilitate the existing pipe while ensuring quality.

  In the present invention, the upstream of the lining portion of the existing pipe is dammed, while the drainage system by the water pump such as sewage that has been dammed is branched into two systems, and the first bypass hose is connected to one system and inserted into the existing pipe Then, draw the rectified pipe into the existing pipe while letting sewage flow down the existing pipe through the first bypass hose, then insert the second bypass hose into the rectified pipe and connect it to the other system. In the rehabilitation method of heating and pressurizing the rectifying pipe while flowing down the existing pipe through the second bypass hose and lining the existing pipe, the bypass hose is formed by laminating a heat insulating layer on the outer peripheral surface of the inner layer hose. It is characterized by.

  According to the present invention, even if the bypass hose is formed by laminating the heat insulating layer on the outer peripheral surface of the inner layer hose, even if sewage or the like is caused to flow downstream of the existing pipe through the bypass hose inserted into the correction pipe. The heat of the sewage flowing through the inner layer hose is blocked by the heat insulating layer, and it is possible to reliably prevent heat exchange between the sewage and the correction pipe through the bypass hose. Therefore, it is possible to reliably prevent the correction pipe from being cooled and sufficiently heat the correction pipe to raise it to a necessary temperature. In addition, compared to using existing heat-resistant tubing, the weight can be reduced while maintaining flexibility without sacrificing heat resistance, thus reducing workability when pulling in or pulling out the bypass hose. There is nothing.

  As a result, the rehabilitated pipe can be sufficiently heated and pressurized to ensure expansion and expansion of the diameter of the rehabilitated pipe so that it is in close contact with the existing pipe, so that the finished pipe can be lined with the rehabilitated pipe while ensuring the finished quality. It does not decrease

  Here, examples of the inner layer hose include polyvinyl chloride suitable as a pipe material, and examples of the heat insulating layer include chloroprene foam material.

  In this invention, when a heat resistant layer is laminated | stacked on the said heat insulation layer, heat insulation and abrasion resistance can be improved.

  In this case, EPR can be mentioned as the heat-resistant layer.

  In the present invention, when ribs or protrusions are provided on the outer peripheral surface of the heat insulating layer, the contact area with the correction pipe can be reduced, and the heat insulating property can be improved while maintaining lightness and flexibility.

  In this case, the ribs and protrusions are preferably formed of EPR having heat resistance.

  In the present invention, when ribs or protrusions are provided on the outer peripheral surface of the heat-resistant layer, the contact area with the correction pipe can be reduced, and heat insulation and wear resistance are improved while maintaining light weight and flexibility. Can be made.

  In this case, the ribs and protrusions are preferably formed of EPR having the same heat resistance as the heat resistant layer.

  According to the present invention, in a rehabilitation method for rehabilitating an existing pipe while allowing sewage to flow down selectively using two bypass hoses, the rehabilitated pipe is sufficiently heated and pressurized without degrading the workability. The pipe can be rehabilitated with quality.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows an embodiment of a bypass hose 1 used in the existing pipe rehabilitation method of the present invention.

  The bypass hose 1 includes an inner layer hose 2 made of polyvinyl chloride, a heat insulating layer 3 made of chloroprene laminated on the outer peripheral surface of the inner layer hose 2, and a heat resistant layer 4 made of EPR laminated on the outer peripheral surface of the heat insulating layer 3. And is formed from.

  In such a bypass hose 1, the heat insulating layer 3 is laminated on the outer peripheral surface of the inner layer hose 2, thereby preventing the heat from being transmitted to the outside even when sewage flows down the bypass hose 1. Can do. Moreover, compared to the case where an existing heat resistant pipe material is used, the weight can be reduced while maintaining the flexibility without impairing the heat resistance, so that the bypass hose 1 is installed in the existing pipe K or the straight pipe 10. Can be easily pulled out, and can be easily pulled out from the existing pipe K or the straightening pipe 10, and workability is not lowered. Moreover, since the heat resistant layer 4 is laminated on the outer peripheral surface of the heat insulating layer 3, the heat insulating property and the wear resistance can be further improved.

  Next, a method for rehabilitating the existing pipe K with the correction pipe 10 using such a bypass hose 1 will be described.

  The rehabilitation pipe 10 is the same as the conventional one formed into a circular pipe shape by a thermoplastic resin such as polyvinyl chloride, and in a state before being inserted into the existing pipe K, the cross-sectional shape thereof is the existing pipe K. It is formed in a substantially elliptical tube shape having a smaller diameter than the inner diameter. And the rehabilitation pipe | tube 10 has the performance which carries out shape recovery to a circular pipe shape by heating to predetermined | prescribed shape memory temperature (for example, 80 degreeC).

  The rehabilitation work is executed after high pressure water cleaning of the inner peripheral surface of the existing pipe K is performed.

  First, an air plug S is disposed upstream of the starting side manhole M1, and compressed air is supplied from a compressor (not shown) installed on the ground to expand the sewage. On the other hand, a water pump P is disposed upstream of the air plug S, and a drain hose H connected to the water pump P penetrates the air plug S in a watertight manner and is led downstream. The drainage hose H drawn from the air plug S is connected to a branch pipe B having two branch portions B1 and B2 each having a stop valve V.

  The water pump P is supplied with pressure oil from a power source (not shown) such as hydraulic pressure installed on the ground through the air plug S and is driven. For this reason, when the water pump P is driven with appropriate power, sewage or the like blocked by the air plug S is sucked through the water pump P and connected to the downstream side of the air plug S via the drain hose H. Drained from B.

  When such preparatory work is completed, the bypass hose 1 described above is drawn into the lining portion of the existing pipe K as the first bypass hose 11 through the start side manhole M1, and is extended to the downstream of the arrival side manhole M2. In the start side manhole M1, one end of the first bypass hose 11 is connected to one branch portion B1 of the branch pipe B, and then the stop valve V disposed in the branch portion B1 is switched and opened. Thereafter, when the water pump P is driven, sewage and the like blocked by the air plug S are sucked through the water pump P, and the drain hose H, one branch portion B1 of the branch pipe B, and the first bypass hose 11 are connected. Then, the water is drained downstream of the reaching manhole M2 (see FIG. 2).

  Thus, the rehabilitation pipe | tube 10 is inserted in the existing pipe | tube K in the state which is flowing down the sewage etc. through the 1st bypass hose 11. FIG. Therefore, a rehabilitation pipe 10 having a predetermined length, for example, a length obtained by adding a margin to the length between the start side manhole M1 and the arrival side manhole M2 is prepared in the start side manhole M1, and the arrival side manhole M2 is provided. A winch W for winding the pulling wire 5 of the rehabilitation pipe 10 is installed. Moreover, while pinching the front-end | tip of the rehabilitation pipe | tube 10, after inserting the traction wire 5 in the existing pipe K between the arrival side manhole M2 and the start side manhole M1, it is the front end part of the rehabilitation pipe | tube 10 pinched in the start side manhole M1. Connect to

  If the pulling wire 5 is connected to the tip of the rehabilitation pipe 10, the winch W is driven to wind up the pulling wire 5, and the rehabilitation pipe 10 is drawn into the existing pipe K (see FIG. 3).

  If the rehabilitation pipe 10 is drawn into the existing pipe K, the rehabilitation pipe 10 is cut in a state where the rehabilitation pipe 10 is extended to a certain length of the manhole in consideration of the linear expansion during cooling in the start side manhole M1 and the arrival side manhole M2. After that, while plugging the plug body 6 at one end thereof and closing it, the bypass hose 1 is pulled in as the second bypass hose 12 through the starting side manhole M1, and inserted into the correction pipe 10 through the plug body 6, At the other end of the straightening tube 10, it extends through the plug body 6 to the downstream of the reaching manhole M2. Further, the plug body 6 into which the tip of the second bypass hose 12 is inserted is attached to the other end portion of the correction pipe 10 and closed. Next, after one end of the second bypass hose 12 is connected to the other branch portion B2 of the branch pipe B in the start side manhole M1, the stop valve V disposed in the branch portion B2 is switched and opened. Further, the stop valve V of one branch portion B1 is switched and closed, and the first bypass hose 11 is detached from the one branch portion B1. As a result, the sewage or the like blocked by the air plug S is drained from the water pump P to the downstream side of the arrival-side manhole M2 via the drainage hose H, the other branch portion B2 of the branch pipe B, and the second bypass hose 12 ( (See FIG. 4).

  Furthermore, the other end of the heat medium supply pipe 7 whose one end is connected to the heating medium generator, for example, the heating steam generator G (see FIG. 5), is connected to the one end side plug body 6 of the rectifying pipe 10. One end of the heat medium discharge pipe 71 is connected to the end side plug body 6.

  Next, when the heating steam generator G is driven to supply the heating steam to the rehabilitation pipe 10 through the heat medium supply pipe 7, the heat of the heating steam is transmitted to the rehabilitation pipe 10. As a result, the straightening pipe 10 is heated and softened from the inner peripheral surface side by the heating steam supplied to the inside thereof, and is restored to the shape of a circular pipe, and is pressurized by the pressure of the heating steam and expanded and expanded. (See FIG. 5). In this case, since the sewage or the like has previously flowed through the first bypass hose 11, the existing pipe K is kept in a dry state, and the second bypass hose 12 is inserted into the rehabilitation pipe 10. At the same time, although sewage or the like flows down the second bypass hose 12, heat such as sewage flowing down the second bypass hose 12 is blocked from being transmitted to the straight pipe 10 by the heat insulating layer 3. For this reason, the rehabilitation pipe 10 is prevented from heat exchange with the sewage flowing through the second bypass hose 12, and is sufficiently heated and softened from the inner peripheral surface side by the heating steam supplied to the inside thereof. Pressurized by the pressure of the steam, expanded and expanded in diameter, and comes into close contact with the inner peripheral surface of the existing pipe K (see FIG. 6).

  At this time, the first bypass hose 11 is easily crushed and flattened by expanding and expanding the diameter of the correction pipe 10 by the pressure of the heated steam supplied to the correction pipe 10. When the shape is restored to the shape, it can be prevented from becoming a protrusion, and the finished quality can be ensured. On the other hand, the second bypass hose 12 inserted through the straightening pipe 10 is prevented from being crushed by sewage flowing under a certain pressure through the water pump P, thereby affecting the flow of sewage. Never give.

  The excessive heating steam supplied to the rehabilitation pipe 10 is discharged through the heat medium discharge pipe 71, and the internal pressure of the rehabilitation pipe 10 is kept constant.

  If the rehabilitation pipe 10 is heated and pressurized by the heating steam for a set time to be in close contact with the inner peripheral surface of the existing pipe K, the heating steam generator G is stopped, while the cooling medium, for example, normal temperature is applied. The blower (not shown) is driven to supply the compressed air to the rehabilitation pipe 10 through the heat medium supply pipe 7. When the normal temperature pressurized air is supplied to the rehabilitation pipe 10, the rehabilitation pipe 10 exchanges heat with the normal temperature pressurized air supplied instead of the heating steam, and cools while continuing to pressurize with the pressurized air. Is done.

  If the rehabilitation pipe 10 is cooled and exceeds the glass transition temperature and falls below the set temperature, after the supply of pressurized air is stopped, the rehabilitation pipe 10 is cut along the edge of the existing pipe K, and 2 When the bypass hose 12 is detached from the branch pipe B, the drainage or the like flows down along the rehabilitation pipe 10 that is in close contact with the inner peripheral surface of the existing pipe K via the drainage hose H.

  After that, if the second bypass hose 12 or the air plug S is collected, the sewage or the like that is prevented from flowing down flows down along the straightened correction pipe 10.

  In this embodiment, the case where heating steam is used as the heating medium has been described. However, hot air or hot water may be used, and normal temperature pressurized air is used as the cooling medium. May be.

  By the way, in embodiment mentioned above, although the bypass hose 1 of the 3 layer structure which consists of the inner layer hose 2, the heat insulation layer 3, and the heat resistant layer 4 was illustrated, a rib or a protrusion can also be provided in the outer peripheral surface of the heat resistant layer 4. .

  Specifically, in the modified example of the bypass hose 1 shown in FIG. 7, ribs 1 a made of EPR are provided on the outer peripheral surface of the heat-resistant layer 4 at a set interval in the tube axis direction. 7 may be a semicircular or triangular shape in addition to the square shape shown in FIG. 7, and the rib 1a has a width and a height of several mm to several tens of mm, respectively.

  Further, in the modified example of the bypass hose 1 shown in FIG. 8, a large number of EPR projections 1b are provided on the outer peripheral surface of the heat-resistant layer 4, and the projection 1b has a cylindrical shape shown in FIG. In addition, the shape may be spherical or conical, and the protrusion 1b has a diameter and a height of several mm to several tens mm.

  Thus, by forming the rib 1a or the protrusion 1b, the contact area of the bypass hose 1 with respect to the correction pipe 10 is reduced, so that heat insulation and wear resistance are improved while maintaining light weight and flexibility. be able to.

  Further, as the bypass hose 1, the heat-resistant layer 4 is not necessarily required depending on the temperature of the heating medium accompanying the shape memory temperature of the rehabilitation pipe 10, and is laminated on the inner layer hose 2 and its outer peripheral surface as shown in FIG. 9. A two-layer structure composed of the heat insulating layer 3 may be used. Furthermore, you may make it form the rib 1a or protrusion 1b made from EPR mentioned above in the outer peripheral surface of the heat insulation layer 3 in such a bypass hose 1. FIG.

  As described above, according to the present invention, even in an environment where sewage or the like flows down, it is possible to rehabilitate existing pipes while ensuring quality. Even existing pipes can be rehabilitated and the social infrastructure can be reconstructed.

It is sectional drawing which shows typically one Embodiment of the bypass hose used for the existing pipe renovation method of this invention. It is process drawing explaining the rehabilitation method of the existing pipe constructed using the bypass hose of this invention. It is process drawing explaining the rehabilitation method of the existing pipe constructed using the bypass hose of this invention. It is process drawing explaining the rehabilitation method of the existing pipe constructed using the bypass hose of this invention. It is process drawing explaining the rehabilitation method of the existing pipe constructed using the bypass hose of this invention. It is process drawing explaining the rehabilitation method of the existing pipe constructed using the bypass hose of this invention. It is the schematic which shows the modification of the bypass hose of FIG. It is the schematic which shows another modification of the bypass hose of FIG. It is sectional drawing which shows typically other embodiment of the bypass hose used for the existing pipe renovation method of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bypass hose 11 1st bypass hose 12 2nd bypass hose 1a Rib 1b Protrusion 2 Inner layer hose 3 Heat insulation layer 4 Heat-resistant layer 10 Repair pipe K Existing pipe M1, M2 Manhole S Air plug B Branch pipe H Drain hose P Water pump

Claims (4)

  While damming the upstream of the lining part of the existing pipe, the drainage system by the water pump, such as sewage that has been damped, is branched into two systems, and the first bypass hose is connected to one of the systems and inserted into the existing pipe for sewage, etc. Is drawn down into the existing pipe while flowing down the existing pipe through the first bypass hose, and then the second bypass hose is inserted into the correction pipe and connected to the other system. In the rehabilitation method of heating and pressurizing the straightening pipe while lining it down to the existing pipe while flowing down through the existing pipe, the bypass hose is formed by laminating a heat insulating layer on the outer peripheral surface of the inner layer hose. Bypass hose used for existing pipe rehabilitation methods.   The bypass hose used in the existing pipe rehabilitation method according to claim 1, wherein a heat-resistant layer is laminated on the heat insulating layer.   The bypass hose used in the existing pipe rehabilitation method according to claim 1, wherein a rib or a protrusion is provided on an outer peripheral surface of the heat insulating layer.   The bypass hose used in the existing pipe rehabilitation method according to claim 2, wherein a rib or a protrusion is provided on an outer peripheral surface of the heat-resistant layer.

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