JP2020101205A - Shelter and regeneration method of existing pipe - Google Patents

Abstract

To easily manufacture a shelter for securing the safety of a worker when installing an existing pipe and a regeneration pipe.SOLUTION: In a regeneration method of an existing pipe for making a regeneration pipe 15 by spirally winding a band-shaped member 4 by using a pipe making machine 3 in the existing pipe 1, a shelter 11 is manufactured prior to a pipe making process of the regeneration pipe 15. That is, an original pipe 10 for the shelter is manufactured by spirally winding the band-shaped member 4 by using the pipe making machine 3 at a bottom part of a manhole 2a connected to the existing pipe 1, and by cutting the original pipe 10, the cylindrical shelter having the same diameter as that of the regeneration pipe 10 is obtained. In the pipe making process of the regeneration pipe 15, the shelter 11 is arranged at an advance side of the pipe making machine 3, and the shelter 11 is progressed together with the pipe making machine 3 accompanied by the extension of the regeneration pipe 15.SELECTED DRAWING: Figure 4

Description

TECHNICAL FIELD The present invention relates to a shelter used for ensuring safety of work when installing a rehabilitation pipe in an existing pipe, and a method of rehabilitating an existing pipe in which a rehabilitation pipe is installed in the existing pipe while using the shelter.

When existing pipes such as sewer pipes buried in the ground are deteriorated, if the existing pipes are excavated and the existing pipes are removed and new pipes are installed, the construction period becomes long and it is difficult to secure a construction space. Therefore, a method of installing a rehabilitation pipe inside the existing pipe without removing the existing pipe is generally adopted.

Patent Document 1 discloses a technique for forming a pipe while extending a rehabilitation pipe along the existing pipe by spirally connecting band-shaped members with a pipe making machine in the existing pipe. The pipe making machine is always located at the tip of the rehabilitation pipe in the extending direction, and moves as the rehabilitating pipe is extended. According to this pipe manufacturing method, the rehabilitation pipe can be installed while maintaining the circulation in the existing pipe.

In the pipe making process, a worker is always accompanied by the pipe making machine to monitor and assist the pipe making work by the pipe making machine and to perform maintenance and inspection of the pipe making machine.
In recent years, construction methods have been developed that can bear the strength only with rehabilitation pipes. With this method, it is not necessary to consider the strength of the existing pipe, so it is not necessary to evaluate the residual strength of the existing pipe, but if the existing pipe is too old, there is no possibility of sudden collapse and collapse. It cannot be said that the means for ensuring the safety of workers is required.

As a means for ensuring the above safety, Patent Document 2 proposes disposing a shelter in an existing pipe. In this shelter, a plurality of arc-shaped steel plates are inserted into a manhole, and these steel plates are connected at the bottom of the manhole to assemble a tubular shelter.

JP, 2016-43555, A JP, 2018-150999, A

The shelter of Patent Document 1 has a drawback that it takes time to assemble a plurality of steel plates by connecting them.

In order to solve the above-mentioned problems, the present invention is a shelter used when installing a rehabilitation pipe in an existing pipe, which is constituted by a spiral band-shaped member, and side edges of adjacent winding portions of the band-shaped member. It is characterized in that it has a tubular shape by being fitted with.
According to the above configuration, by using the pipe manufacturing machine for manufacturing the rehabilitation pipe, the shelter for ensuring the safety of the worker can be obtained relatively easily in the manhole.

Another aspect of the present invention is to make a rehabilitating pipe by spirally winding a strip-shaped member in an existing pipe by a pipe making machine and fitting side edges of adjacent winding parts to each other. In the method of rehabilitating the existing pipe, which extends the rehabilitating pipe from the starting end of the existing pipe toward the reaching end and advances the pipe making machine in the same direction,
Prior to the pipe making process of the rehabilitating pipe, in the space including the bottom portion of the manhole connected to the existing pipe, the strip-shaped member is spirally wound by the pipe making machine and the side edges of adjacent winding portions are fitted to each other. By producing a tubular shelter having the same diameter as the rehabilitating pipe by doing, in the pipe making step of the rehabilitating pipe, the shelter is arranged on the forward side of the pipe making machine, and with the extension of the rehabilitating pipe, It is characterized in that the shelter is moved forward together with the pipe making machine.
According to the above method, the shelter for ensuring the safety of the worker can be obtained relatively easily in the manhole. Further, even if the shelter is left in the existing pipe during the work, the diameter of the shelter is the same as that of the rehabilitating pipe, so that the flow in the existing pipe is not hindered and the shelter can be easily avoided.

Preferably, the shelter is manufactured in a space including a bottom portion of a starting side manhole connected to the starting end of the existing pipe.
According to the above method, it is possible to reduce the movement of the manufactured shelter and the pipe making machine and start the production of the rehabilitating pipe.

In a specific aspect, in a space including the bottom of the starting-side manhole, from the strip-shaped member by the pipe making machine, a raw pipe for the shelter is pipe-formed so as to extend to the opposite side of the reaching end, Obtaining a shelter by cutting the raw tube,
After inserting the shelter into the existing pipe, the pipe making machine is turned horizontally in the starting-side manhole to change its direction and then inserted into the existing pipe, after which the pipe making process of the rehabilitation pipe is started. ..

In another specific aspect, in the space including the bottom of the starting side manhole, the raw pipe for the shelter is pipe-formed by the pipe-making machine from the strip-shaped member so as to extend toward the reaching end. , Obtaining a shelter by cutting the raw tube,
In the state where the pipe making machine is retracted to a position outside the passage of the shelter in the starting side manhole, the shelter is moved along the passage and inserted into the existing pipe, and then the pipe making The machine is inserted into the existing pipe, after which the pipe making process of the rehabilitation pipe is started.

In another specific aspect, the shelter can be manufactured in a space including the bottom of the reaching-side manhole connected to the reaching end of the existing pipe. That is, from the strip-shaped member by the pipe making machine, the raw pipe for the shelter is made to be stretched to the side opposite to the starting end, and the shelter is obtained by cutting the raw pipe. Is moved to a position near the starting end through the existing pipe, the pipe making machine is further inserted into the existing pipe from the starting end, and then the pipe making process of the rehabilitating pipe is started.

Preferably, after the raw pipe is cut to obtain a shelter, the end of the unfitted strip-shaped member connected to the remaining portion of the raw pipe is connected to the tip of a new strip-shaped member to produce the rehabilitated pipe. Start the process.
According to the above method, waste of material can be eliminated.

According to the present invention, it is easy to manufacture a shelter, and even if the shelter is left in the existing pipe, the distribution of the existing pipe is not hindered.

FIG. 3 is a schematic vertical cross-sectional view for explaining the existing pipe rehabilitation method according to the first embodiment of the present invention, showing a step of producing a raw pipe for a shelter in a starting manhole prior to a regenerative pipe production step. It is a schematic longitudinal cross-sectional view showing a step of cutting the raw pipe to separate the shelter and inserting the shelter into the existing pipe. It is a schematic longitudinal cross-sectional view which shows the process of rotating the said pipe making machine horizontally, changing the direction, and inserting in the said existing pipe. It is a schematic longitudinal cross-sectional view showing a step of producing a rehabilitating pipe in a state where the shelter is arranged on the forward side of the pipe producing machine. It is a schematic longitudinal cross-sectional view showing a state where the installation of the rehabilitation pipe in the existing pipe is completed. It is a cross-sectional view of the said strip|belt-shaped member for original pipes and rehabilitation pipes. It is a schematic longitudinal cross-sectional view explaining the existing pipe rehabilitation method which concerns on 2nd Embodiment of this invention, showing the process of manufacturing the raw pipe for shelters in the starting side manhole prior to the pipe manufacturing process of a rehabilitation pipe. In 2nd Embodiment, it is a schematic longitudinal cross-sectional view which shows the process of inserting the cut shelter in the existing pipe. It is a schematic longitudinal cross-sectional view explaining the existing pipe rehabilitation method which concerns on 3rd Embodiment of this invention, showing the process of manufacturing the raw pipe for shelters in the reaching manhole prior to the pipe manufacturing process of a rehabilitation pipe. In 3rd Embodiment, it is a schematic longitudinal cross-sectional view which shows the process of moving the cut shelter to the starting end vicinity of the existing pipe.

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 4, an existing sewer pipe 1 (hereinafter referred to as an existing pipe) is buried substantially horizontally in the ground. The existing pipe 1 that has deteriorated is rehabilitated by installing a rehabilitation pipe 15 described later inside thereof.
In the following description, one end of the existing pipe 1 (end on the pipe making start side of the rehabilitating pipe 15) is referred to as a starting end 1a, and the other end of the existing pipe 1 (end on the pipe making end side of the rehabilitating pipe 15) is a reaching end. Say 1b. The starting end 1a of the existing pipe 1 is connected to the starting side manhole 2a, and the reaching end 1b is connected to the reaching side manhole 2b.

Rehabilitation of the existing pipe 1 is performed in a state where sewage is flowing through the existing pipe 1. Hereinafter, a method for rehabilitating the existing pipe 1 will be described step by step.

Pipe making process for raw pipe for shelter As shown in FIG. 1, a predetermined length having a spiral curl is formed at the bottom of the starting side manhole 2a by a pipe making machine 3 used for making a rehabilitating pipe 15 described later. A cylindrical raw pipe 10 is produced from the band-shaped member 4 (which is simply shown by one thick solid line in the figure). The pipe making of the raw pipe 10 is the same as the pipe making of the rehabilitation pipe 15 described later. Briefly described, as shown in FIG. 6, the belt-shaped member 4 has fitting portions 4a and 4b that are continuous on both side edges, and in this embodiment, a reinforcing belt member 4x made of metal or the like is attached. There is. In the pipe making machine 3, the fitting pipes 4a and 4b of the adjacent winding parts of the strip-shaped member 4 are pressed together in the thickness direction to be fitted to each other, so that the strip-shaped member 4 is spirally connected to each other. To make a pipe. The raw pipe 10 is reinforced by the reinforcing strips 4x and has high rigidity.

In the present embodiment, the raw pipe 10 is stretched in the direction opposite to the reaching end 1b of the existing pipe 1 during the pipe manufacturing process, and the pipe manufacturing machine 3 is also moved in the same direction at the tip in the stretching direction. As a result, the raw pipe 10 and the pipe manufacturing machine 3 enter the existing pipe 1A extending from the starting side manhole 2a to the opposite side of the existing pipe 1 to be rehabilitated.
The extending direction of the raw pipe 10 and the moving direction of the pipe making machine 3 in the pipe making process of the raw pipe 10 are opposite to the extending direction of the rehabilitating pipe 15 and the moving direction of the pipe making machine 3 in the pipe making process of the rehabilitating pipe 15. is there.

The pipe manufacturing machine 3 is connected to a hydraulic cable 5 extending to a manhole (not shown) connected to the other end of the existing pipe 1A (the end on the opposite side of the transmitting side manhole 2a). The hydraulic cable 5 exits from this manhole and is connected to a hydraulic device (not shown) on the ground. An electric power cable is also connected to the pipe making machine 3, and the electric power cable also extends in the same direction as the hydraulic cable and is connected to the power generator on the ground. The power cable is not shown to simplify the drawing.

Shelter manufacturing process The raw pipe 10 manufactured as shown in FIG. 1 is cut into 50 cm to 2 m, for example, 1 m to obtain a shelter 11. Two wheels 11a, which are separated from each other in the circumferential direction, are attached to the front and rear ends of the shelter 11, and are inserted into a position near the starting end 1a in the existing pipe 1 to be rehabilitated.
As described above, the shelter 11 can be relatively easily manufactured by using the pipe manufacturing machine 3 in the starting side manhole 2a.

Preparation process for rehabilitating pipe making Next, the pipe making machine 3, the remaining portion 12 of the raw pipe 10 and the unfitted strip-shaped member 4 connected to this remaining portion 12 are rotated 180° horizontally and their orientations are changed. From above, it is inserted into the existing pipe 1 as shown in FIG. The hydraulic cable 5 and the electric power cable are passed through the existing pipe 1, and are connected to the hydraulic device 6 and the power generator on the ground from the reaching manhole 2b as shown in FIG.
As shown in FIG. 4, the end of the strip-shaped member 4 which is not fitted is connected to the tip of the strip-shaped member 4 pulled out from the drum 7 installed on the ground near the starting-side manhole 2a.

Pipe manufacturing process of the rehabilitating pipe is then re-drives the pipe producing machine 3, as in the case of the original tube 10 to the pipe producing a rehabilitating pipe 15 by connecting the strip 4 helically. As the pipe making progresses, the rehabilitating pipe 15 extends from the starting end 1a of the existing pipe 10 toward the reaching end 1b. The pipe making machine 3 is located at the tip of the rehabilitation pipe 15, and advances toward the reaching end 1b as the rehabilitation pipe 15 extends. The belt-shaped member 4 from the drum 7 is sent to the pipe-making machine 3 through the starting-side manhole 2a, the rehabilitation pipe 3 and the spiral-shaped winding member.

In the pipe making step, the shelter 11 is arranged on the forward side of the pipe making machine 3. The shelter 11 advances together with the pipe making machine 3 as the rehabilitation pipe 15 is stretched. The shelter 11 may be moved forward by the human power of a worker, or as shown by an imaginary line in FIG. The shelter 11 may be advanced.

The worker is in the shelter 11 to monitor and assist the pipe making work by the pipe making machine 3, and to maintain and inspect the pipe making machine 3.
If the existing pipe 1 is significantly deteriorated, it cannot be said that there is no possibility that the existing pipe 1 will collapse. Since this falling piece can be received by the top of the shelter 11, it is possible to ensure the safety of the workers in the shelter 11.

When the pipe making process of the rehabilitation pipe 15 is interrupted, for example, when the pipe making process does not end in one day and is carried over to the next day, the shelter 11 is not removed from the existing pipe 1 and the wheel 11a is removed to rehabilitate the pipe. It can be left in the existing pipe 1 together with 15. The shelter 11 has the same diameter and the same cross-sectional shape as the rehabilitating pipe 15, does not hinder the flow in the existing pipe 1, and simply installs a simple supporting work on the existing pipe 1 in front of the shelter 11, This is because 11 can be prevented from being washed away.

Final Process As shown in FIG. 5, the pipe making of the rehabilitating pipe 15 ends when the reaching end 1b of the existing pipe 1 is reached. Finally, a lining material such as mortar is filled between the rehabilitation pipe 15 and the existing pipe 1 to complete the rehabilitation work.
For example, when the existing pipe 1B is also rehabilitated, the shelter 11 may be used for the rehabilitation work, or may be returned to the strip-shaped member or cut and taken out from the reaching manhole 2b.

Next, another embodiment of the present invention will be described with reference to the drawings. In the figure, the components corresponding to those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

7 and 8 show the second embodiment. In this embodiment, as shown in FIG. 7, the raw pipe 10 is produced in the existing pipe 1A and the starting manhole 2a in the same direction as in the case of producing the rehabilitation pipe 15. That is, the raw pipe 10 extends toward the reaching end 1b (not shown in FIG. 7) of the existing pipe 1, and the pipe making machine 3 moves in the same direction. In this case, since the cut shelter 11 is arranged on the opposite side of the reaching end 1b when viewed from the pipe making machine 3, it is necessary to exchange the positions of the pipe making machine 3 and the shelter 11.

As shown in FIG. 8, in the starting-side manhole 2a, the pipe-manufacturing machine 3, the remaining portion 12 of the raw pipe 10 and the unfitted strip-shaped member 4 are lifted by a lift (not shown) via the wire 8, The shelter 11 is evacuated to a position off the passage. In this state, the shelter 11 is moved along the passing path and inserted into the existing pipe 1. After this, the pipe making machine 3 is lowered and inserted into the existing pipe 1 without changing the direction.

Since the subsequent steps are the same as the preparation step for the rehabilitated pipe manufacturing process, the pipe manufacturing process for the rehabilitated pipe 15 and the final process of the first embodiment, description thereof will be omitted.
Instead of lifting the pipe making machine 3 as described above, the pipe making machine 3 may be moved laterally in the starting-side manhole 2a (in a direction orthogonal to the paper surface in FIG. 8) and retracted to a position deviated from the passage of the shelter 11.

9 and 10 show a third embodiment. In this embodiment, as shown in FIG. 9, the raw pipe 10 is manufactured at the bottom of the reaching-side manhole 2b. The extending direction of the raw pipe 10 and the moving direction of the pipe making machine 3 during pipe making are the same as the extending direction of the rehabilitating pipe 15 and the moving direction of the pipe making machine 3 in the pipe making process of the rehabilitating pipe 15. As a result, the raw pipe 10 and the pipe manufacturing machine 3 enter the existing pipe 1B extending from the reaching manhole 2b to the opposite side of the existing pipe 1 to be rehabilitated.

After the production of the raw pipe 10 is completed and the raw pipe 10 is cut to obtain the shelter 11, wheels 11a are attached to the shelter 11 to move the inside of the existing pipe 1 to the vicinity of the starting end 1a of the existing pipe 1. Position it. After this, the pipe making machine 3 is introduced from the starting side manhole 2a. Subsequent steps are the same as the preparation step for the rehabilitated pipe manufacturing process, the rehabilitated pipe manufacturing process in the first embodiment, and the final process.

The present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the invention.
The existing pipe to be rehabilitated is not limited to the sewer pipe, but may be a water pipe or the like.
In the first and third embodiments, the shelter original pipe may be manufactured in an existing pipe to be rehabilitated.
In the above embodiment, in order to save the material, the strip-shaped member from the drum is connected to the unfitted strip-shaped member left in the pipe-making machine. The member may be removed and the rehabilitating pipe may be produced by a belt-shaped member from the drum.

INDUSTRIAL APPLICABILITY The present invention can be applied to rehabilitation of sewer pipes buried underground.

1 Existing pipe 1a Starting end 1b Reaching end 2a Starting side manhole 2b Reaching side manhole 3 Pipe making machine 4 Band members 4a, 4b Fitting part 10 Raw pipe 11 Shelter 12 Remaining pipe 15 Rehabilitation pipe

Claims (4)

A shelter used when installing a rehabilitation pipe in an existing pipe,
A shelter comprising a spiral band-shaped member and having a tubular shape by fitting side edges of adjacent winding portions of the band-shaped member. Inside the existing pipe, a strip-shaped member is spirally wound by a pipe-making machine and the side edges of adjacent winding parts are fitted together to produce a rehabilitated pipe, and in this pipe-making process, the rehabilitated pipe is started from the existing pipe. In a method of rehabilitating an existing pipe, which extends from the end toward the reaching end and advances the pipe manufacturing machine in the same direction,
Prior to the pipe making step of the rehabilitating pipe, in the space including the bottom of the manhole connected to the existing pipe, the band-shaped member is spirally wound by the pipe making machine and the side edges of adjacent winding portions are fitted to each other. By making a cylindrical shelter having the same diameter as the rehabilitation pipe,
In the pipe making step of the rehabilitating pipe, the shelter is arranged on the forward side of the pipe making machine, and the shelter is moved forward together with the pipe making machine as the rehabilitating pipe is stretched. .. The method of rehabilitating an existing pipe according to claim 2, wherein the shelter is manufactured in a space including a bottom portion of a starting-side manhole connected to the starting end of the existing pipe. In the space including the bottom of the reaching-side manhole connected to the reaching end of the existing pipe, the raw pipe for the shelter is extended from the strip-shaped member to the opposite side of the starting end by the pipe making machine. To make a pipe, and obtain a shelter by cutting the raw pipe.
Moving the shelter through the existing pipe to a position near the starting end, further inserting the pipe making machine from the starting end into the existing pipe, and then starting the pipe making process of the rehabilitating pipe. The method for rehabilitating an existing pipe according to claim 2.

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