JP2007303535A - Method for regenerating pipeline - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for regenerating not only an existing pipe having small diameter but also an existing pipe having large diameter economically. <P>SOLUTION: A temporary water drain pipe having smaller outside diameter than inside diameter of an existing pipeline is installed in the existing pipeline. A cylindrical pipe to be regenerated having smaller outside diameter than inside diameter of the existing pipeline and larger inside diameter than outside diameter of the temporary water drain pipe is installed at the outer periphery of the temporary water drain pipe as a single unit. The pipe to be regenerated as the single unit is pressurized and moved in the direction of the pipeline inside the existing pipeline to pressurize the single units sequentially and form a continuous body of pipes to be regenerated. A grout material is poured between the outer periphery of the continuous body and the inner periphery of the existing pipe and is hardened. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a method for rehabilitating a pipeline, for example, a method for rehabilitating a deteriorated sewer.

The following methods have been developed as conventional methods for rehabilitating pipelines.
<1> A bag-like lining material impregnated with a resin that is cured by heat or light is inserted into an existing pipe from an existing manhole. At that time, a method of forming a new tube body by inserting the bag body while reversing it using water pressure or air pressure, press-bonding it to the inner surface of the existing tube, and curing it as it is. (Inversion method)
<2> A resin-impregnated liner or a continuous pipe made of cured resin is drawn into the existing pipe from the existing manhole and is expanded by water pressure or air pressure to be crimped to the inner surface of the existing pipe. A method of constructing a new tube by pressure-curing or cooling-curing with hot water, steam, light or the like in that state. (Forming method)
<3> A method of forming a new tubular body by forming a pipe while fitting a lining material such as a belt in an existing pipe and filling a gap between the existing pipe and the constructed pipe with mortar or the like. (Pipe making method)
<4> This is a method of using secondary products manufactured at the factory as rehabilitation materials, and a new pipe is constructed by inserting a new pipe manufactured with a smaller pipe diameter than the existing pipe and filling the gap with a filler. how to. (Sheath tube method)

JP 2001-173085 A.

The above-described conventional pipe rehabilitation method has the following problems especially when rehabilitating a large existing pipe having a diameter of about 1500 mm.
<1> The reversal method and the forming method are technologies originally intended for rehabilitation of existing pipes with small and medium diameters. Therefore, as the diameter increases, the equipment for generating water pressure and air pressure increases. Furthermore, in the construction method using hot water, it is necessary to circulate the injected water used to expand the lining material through a boiler to supply heat, and the heat supply system must have a large capacity. Therefore, these methods are limited in terms of construction equipment and construction extension is also limited.
<2> The reversal method and the forming method have a higher internal pressure required for expansion as the diameter becomes larger. Therefore, it is necessary to increase the strength of the liner itself, and there is a limit in terms of material quality and economy. .
<3> In the pipe making method, a material or shape that can take a large amount of deformation is used because it is necessary to form a lining in an existing pipe. Therefore, the larger the diameter, the more likely the deflection of the upper part of the lining material due to the weight of the material and the swelling to the inside of the pipe body due to the filling pressure during backfilling, which requires a lot of support work to prevent this. There is a limit from the aspect of property and economy.
<4> In the sheath tube method, it is necessary to continuously insert a tubular body having a length of about 1 m from the restriction that the tubular body is inserted from the manhole portion of the sewage pipe. Accordingly, a joint portion is generated every 1 m in the finished insertion pipe, and the longer the extension is, the more the number of joints that are weak points increases, and the possibility of water leakage to the outside of the sewage is considered.
<5> In any construction method, it is difficult to change the specifications of rehabilitated pipes due to the degree of deterioration of existing pipes. There is a problem with sex.

In order to solve the above-described problems, the present invention provides a temporary drain pipe having an outer diameter smaller than the inner diameter of an existing pipe line in an existing pipe line, and a cylinder is formed on the outer periphery of the temporary drain pipe. In this case, a single rehabilitation pipe having an outer diameter smaller than the inner diameter of the existing pipe line and having a larger inner diameter than that of the temporary drain pipe is installed, and the single rehabilitation pipe is piped inside the existing pipe line. Pressurize and move in the direction of the road, sequentially pressurize the single body to form a continuous body of rehabilitation pipe, and inject and cure the grout material between the outer periphery of this continuous body and the inner periphery of the existing pipe, It features the method of rehabilitating pipelines.
In the rehabilitation method described above, the rehabilitation pipe is constituted by a half precast plate, a part of the truss arranged inside the rehabilitation pipe is projected from the outer surface, and a PC steel wire is inserted into the projected truss. The tension of the PC steel wire is used to move the rehabilitation pipe, and then the tension of the rehabilitation pipe continuum, including the PC steel wire, the outer circumference of the rehabilitation pipe continuum, and the existing pipe It is characterized by a pipeline rehabilitation method in which a grout material is injected between the inner circumferences and cured.
In addition, in the above rehabilitation method, the present invention provides a method for installing a single rehabilitation pipe on the outer periphery of the temporary drain pipe, after cutting a part of the temporary drain pipe, installing the rehabilitation pipe, and after installing the rehabilitation pipe. Again, it is characterized by a method of rehabilitating the pipeline by connecting the cut portions of the temporary drain pipe.
Moreover, this invention arrange | positions the division | segmentation formwork which divided | segmented the cylinder into the central axis direction on the outer periphery of a temporary drainage pipe, and connects a division | segmentation formwork, when installing the single-piece | unit of a renovation pipe | tube in the outer periphery of a temporary drainage pipe. Thus, a cylindrical frame is arranged in a cylindrical shape on the outer periphery of the temporary drain pipe, and a steel wire is wound around the outer periphery of the cylindrical frame in a space between the outer surface of the cylindrical frame and the inner surface of the existing pipe. The cylindrical frame is pressed and moved in the pipeline direction inside the existing pipeline, and the cylindrical frame is sequentially pressed to form a continuous body of the cylindrical frame, and the outer periphery of the continuous body, It is characterized by a pipeline rehabilitation method in which a grout material is injected between the inner circumferences of existing pipes and cured.

Since the pipe rehabilitation method of the present invention is as described above, the following effects can be obtained.
<1> Rehabilitation of existing pipes with a large diameter as well as rehabilitation of existing pipes with a large diameter can be performed economically.
<2> Manufacture of hot water, compressed air, pressure water, etc. is unnecessary, and can be performed without selecting a construction site.
<3> Since the joint part is abutted with a strong pressure, the joint does not become a weak point and there is no possibility of water leakage.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail according to a construction order with reference to the drawings.

<1> Installation of the temporary drain pipe 1.
This construction method is a method of rehabilitating the existing pipe 2 between the manholes A and B in two locations on the upstream side and the downstream side.
First, the hose for the temporary drain pipe 1 is inserted from the upstream manhole A.
The hose is formed of a flexible material such as a flexible pipe.
The outer diameter of the temporary drain pipe 1 is a pipe smaller than the inner diameter of the existing pipe line.
A part of the existing pipe 2 is dammed by the water stop wall 21, and water upstream from the water stop wall 21 is introduced into the temporary drain pipe 1 and discharged from the downstream end of the temporary drain pipe 1 toward the downstream.
The discharge part at the downstream end is installed at a position further downstream than the manhole B on the downstream side.

<2> Installation of rehabilitation pipe 3 alone.
Next, the single unit of the rehabilitation pipe 3 is suspended from the manhole B on the downstream side, and disposed on the outer periphery of the temporary drain pipe 1. (Fig. 4)
The rehabilitation pipe 3 is a cylinder having an outer diameter smaller than the inner diameter of the existing pipe line and a larger inner diameter than the outer diameter of the temporary drain pipe 1.

<3> Structure of the rehabilitation pipe 3.
This rehabilitation pipe 3 is constituted by a half precast plate, and a part of the truss bar 31 arranged inside the rehabilitation pipe 3 is projected from the outer surface. (Figures 2 and 3)
A PC steel wire is passed through the truss bar 31 projecting to the outside and used as a guide when the rehabilitation pipe 3 is moved.
Further, after arranging the plurality of rehabilitated pipes 3, the PC steel wire that has passed through the truss bars 31 introduces pre-stress to provide a strong integration of the rehabilitated pipes 3 group.
The inner surface of the rehabilitating pipe 3 is resin-lined for the purpose of improving the roughness coefficient and protecting the steel material disposed inside.
For example, a polyware is applied to make a finished surface with less resistance.
The rehabilitation pipe 3 itself is composed of a cement-based material such as mortar or concrete, or a resin-based material such as vinyl chloride or FRP.
When a cement-based material is used, durability is improved by using sulfuric acid-resistant cement.
When a resin material is used, the lining layer on the inner surface of the rehabilitated pipe 3 can be omitted.
The rehabilitation pipe 3 is opened at the top with a confirmation port 32 for bleeding air and confirming the filling state of the grout material.
A grout injection port is opened at the bottom of the rehabilitation pipe 3.
In particular, an inclined ramp is attached to the latest rehabilitation pipe 3 so that the temporary drain pipe 1 can be easily taken into the rehabilitation pipe 3.

<4> Disconnecting and connecting the temporary drain pipe 1.
When the single unit of the rehabilitation pipe 3 is suspended from the manhole B on the downstream side and disposed on the outer periphery of the temporary drainage pipe 1, the single unit of the cylindrical rehabilitation pipe 3 is left as it is in the temporary drainage pipe 1. Cannot be placed on the periphery.
Therefore, a detachable connection portion 11 is provided in advance in the temporary drain pipe 1, and a stop cock 12 is provided on the upstream side of the connection portion 11.
Then, immediately before the rehabilitation pipe 3 is suspended, the temporary drain pipe 1 is disconnected at the connecting portion 11, and the rehabilitation pipe 3 is installed after moving downstream to secure a suspension space.
As soon as the rehabilitation pipe 3 is installed, the temporary drain pipe 1 is connected again at the connecting portion 11, the stop cock 12 is opened, and drainage is resumed through the temporary drain pipe 1.

<5> Movement of rehabilitation pipe 3.
The single unit of the rehabilitation pipe 3 is pressurized and moved toward the upstream side in the pipe line direction inside the existing pipe 2 path.
For this purpose, the fixed frame 4 is arranged on the upstream side, and the moving frame 41 is arranged on the downstream side.
A PC steel wire 42 is connected between the two frames, a center hole jack is arranged in each frame, and the PC steel wire 42 is inserted into the jack.
The PC steel wire 42 also penetrates the inner space of the triangular truss bar 31 protruding from the surface of the rehabilitated pipe 3.
By pulling the PC steel wire 42 by the center hole jack of the fixed frame 4, the moving frame 41 moves upstream.
By the movement of the moving frame 41, the rehabilitation pipe 3 can be pushed forward and advanced.

<6> Retraction of the moving frame 41.
When the rehabilitation pipe 3 is moved forward by a certain distance, only the moving frame 41 in a state where the restraint of the PC steel wire 42 is released is moved backward. (Fig. 5)
Next, the center hole jack of the fixed frame 4 is opened, and the restraint of the PC steel wire 42 is released.

<7> Installation of new rehabilitation pipes.
In this state, the temporary drain pipe 1 is cut and the next rehabilitation pipe 3 is installed.
Further, the PC steel wire 42 opened on the fixed frame 4 side is drawn to the downstream side, and the end portion of the PC steel wire 42 passing through the space of the truss bar 31 of the new renovated pipe 3 is moved to the center hole jack 41a of the moving frame 41. To penetrate. (Fig. 6)

<8> Pulling the rehabilitation pipe.
Thereafter, the step of advancing the rehabilitation pipe 3 through the advancement of the moving frame 41 by connecting the temporary drain pipe 1 and pulling the center hole jack on the fixed frame 4 side is as described above. (Fig. 7)
By continuously performing the above operations, the single unit of the rehabilitation pipe 3 is sequentially pressurized to form a continuous body of the rehabilitation pipe 3.

<9> Tension, back-filling.
In this way, a continuous body of the rehabilitation pipe 3 is formed inside the existing pipe 2.
And the PC steel wire 42 arrange | positioned on the outer periphery of the renovated pipe 3 is tensioned using the center hole jack 41a of the fixed frame 4 and the moving frame 41.
After the tension, the grout material 7 is injected between the outer periphery of the continuum and the inner periphery of the existing pipe 2 through the inlet of the rehabilitated pipe 3 and cured.
When the grout material 7 reaches a predetermined strength, the center hole jack is opened and prestress is introduced into the continuum of the rehabilitated pipe 3.
Thereafter, the temporary drain pipe 1 and the like are removed to complete the rehabilitation.

<10> Other examples. (FIGS. 9 to 11)
This is a method of injecting the grout material by disposing the divided mold on the outer periphery without cutting the temporary drain pipe 1 every time.
That is, in the downstream manhole B, when the single rehabilitating pipe 3 is installed on the outer periphery of the temporary drainage pipe 1, the divided form 5 in which the cylinder is divided in the central axis direction is used instead of the cylinder. To place.
The divided mold 5 is connected to form a cylindrical mold.
When the divided form 5 is assembled to form a cylindrical form, a winding steel wire 6 is wound around the outer circumference of the cylindrical form in a space between the outer surface of the cylindrical form and the inner surface of the existing pipe 2. Put it on.
The wound steel wire 6 is sequentially fed from a steel wire drum 61 placed on the ground and wound. However, if an automatic steel wire winding device 62 is interposed in the middle, the operation is smoother.
In addition, when winding the wound steel wire 6, the temporary drain pipe 1 may be once disassembled at the connection portion 11 and then connected.
In this state, the moving frame 41 is pulled and moved upstream by the PC steel wire 42 arranged between the fixed frame 4 and the moving frame 41 as in the above-described embodiment.
By sequentially moving the moving frame 41, the assembled cylindrical frame is pressurized and moved upstream in the pipeline direction and connected.
In this way, the cylindrical frame is moved inside the existing pipe 2 on the outer periphery of the temporary drain pipe 1, and sequentially connected to form a continuous body of the cylindrical frame.
The grout material 7 is injected between the outer periphery of the continuous body and the inner periphery of the existing pipe 2 to cure the pipe line.
In addition to the configuration in which the temporary drain pipe 1 is attached to the water stop wall 21 as shown in FIG. 10 and the sewage upstream from the water stop wall 21 is introduced into the temporary drain pipe 1, the partition wall 21 is provided as shown in FIG. Instead, use a water stop bag 22 that expands on the outer periphery of the end of the temporary drain pipe 1 instead, and inflates the water stop bag 22 and crimps it to the inner peripheral surface of the existing pipe 2. A structure in which sewage is introduced into the temporary drain pipe 1 can also be adopted.

Explanatory drawing during construction of the rehabilitation method of the pipe line of this invention. Explanatory drawing of the principal part under construction. Sectional drawing of the principal part under construction. It is explanatory drawing of a construction order, and the state which suspended the rehabilitation pipe | tube. It is explanatory drawing of a construction order, the state which retracted the moving frame and cut | disconnected the temporary drain pipe. It is an explanatory diagram of the construction sequence, with a new rehabilitation pipe suspended and a PC steel wire set. It is explanatory drawing of a construction order, and the state which connected the temporary drain pipe again. It is explanatory drawing of a construction order, and the state where the new rehabilitation pipe advanced. Explanatory drawing of the other Example of the rehabilitation method of a pipe line Sectional drawing of another Example. Explanatory drawing of the state which expanded the water stop bag and introduced the sewage flow into the temporary drain pipe.

Explanation of symbols

1: Temporary drain pipe 2: Existing pipe 3: Rehabilitation pipe 4: Fixed frame 41: Moving frame 5: Divided form 6: Wrapped steel wire 7: Grout material

Claims (4)

Install a temporary drain pipe with an outer diameter smaller than the inner diameter of the existing pipe line in the existing pipe line,
On the outer periphery of this temporary drainage pipe, a single rehabilitation pipe that is cylindrical and has an outer diameter smaller than the inner diameter of the existing pipe line and an inner diameter larger than the outer diameter of the temporary drainage pipe,
A single unit of the rehabilitated pipe is moved in the direction of the pipeline inside the existing pipeline,
Pressurize the single unit sequentially to form a continuous body of rehabilitation pipes,
Injecting and curing grout material between the outer circumference of this continuous body and the inner circumference of the existing pipe,
Rehabilitation method for pipelines.
The rehabilitation pipe is a half precast version,
Project a part of the truss placed inside the rehabilitation pipe from the outer surface,
Insert the PC steel wire into this protruding truss,
By tensioning this PC steel wire,
Move the rehabilitation pipe,
And the tension of the continuum of the rehabilitation pipe after that,
Including PC steel wire, grout material is injected and hardened between the outer periphery of the continuous body of the rehabilitated pipe and the inner periphery of the existing pipe.
The method for rehabilitating a pipeline according to claim 1.
When installing a single rehabilitation pipe around the temporary drain pipe,
After cutting a part of the temporary drain pipe,
Set up a rehabilitation pipe,
Connect the cut part of the temporary drain pipe again after installing the rehabilitation pipe.
The method for rehabilitating a pipeline according to claim 1.
When installing a single rehabilitation pipe around the temporary drain pipe,
On the outer periphery of the temporary drain pipe, a split formwork that divides the cylinder in the central axis direction is placed
By connecting the divided formwork, the cylindrical formwork is arranged in a cylindrical shape on the outer periphery of the temporary drain pipe,
In the space between the outer surface of the cylindrical frame and the inner surface of the existing pipe, a steel wire is arranged in a state of being wound around the outer periphery of the cylindrical frame,
The cylindrical formwork is moved by pressing in the direction of the pipeline inside the existing pipeline,
Sequentially, pressurize the cylindrical form to form a continuous form of the cylindrical form,
Injecting and curing grout material between the outer circumference of this continuous body and the inner circumference of the existing pipe,
Rehabilitation method for pipelines.

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