JP2018150999A - Method for ensuring safety inside of existing pipe and shelter for existing pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shelter for ensuring safety inside of an existing pipe that is embedded underground.SOLUTION: A shelter body of a shelter 8 is formed cylindrical and includes an opening in at least one end in an axial direction. The shelter body is divided in a circumferential direction and the axial direction. Divided shelter pieces are carried from the ground through a manhole 2a to a bottom of the manhole 2a. The shelter pieces are connected in the bottom of the manhole 2a or inside of an existing pipe 1, such that the shelter 8 is assembled. The shelter 8 is disposed in such a manner that its axial line extends in a length direction of the existing pipe 1. The shelter 8 is used for e.g., a pipe making process, such that a worker inside of the shelter 8 is enabled to support or monitor pipe making work of a pipe making machine 6.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a safety ensuring method in an existing pipe and a shelter for ensuring safety in the existing pipe.

  When existing pipes such as sewage pipes buried in the ground become obsolete, if the existing pipes are excavated and the existing pipes are removed and newly piped, the construction period will be longer and it will be difficult to secure construction space. For this reason, a method is generally adopted in which a rehabilitated pipe is installed inside the existing pipe without removing the existing pipe.

  Patent Document 1 discloses a technique for manufacturing a rehabilitating pipe while extending along the existing pipe by disposing a pipe making machine in the existing pipe and connecting the strips in a spiral shape with the pipe making machine. ing. The pipe making machine is always located at the tip of the rehabilitation pipe and moves according to the extension of the rehabilitation pipe. In this pipe making process, workers are always accompanied by the pipe making machine, monitoring and assisting the pipe making work by the pipe making machine, and maintaining and inspecting the pipe making machine.

Japanese Unexamined Patent Publication No. 2016-43555

By the way, if the existing pipes are severely aged, they may suddenly collapse and collapse. For this reason, workers are forced to work inside the rehabilitation pipe, but there has been a demand for means for ensuring safety even outside the rehabilitation pipe.
As means for ensuring the safety, the present inventor has proposed to arrange a shelter in an existing pipe. If such a shelter is used, it is possible to ensure the safety of the operator when investigating and inspecting existing pipes as well as during the production of rehabilitated pipes.
However, since the entire shelter could not be carried in from the narrow opening of the manhole, further contrivance was required.

In order to solve the above problems, the present invention provides a method for ensuring safety in an existing pipe.
A shelter having a cylindrical shape and having an opening at least at one end in the axial direction is prepared as a plurality of shelter pieces by dividing each in the circumferential direction and the axial direction,
The shelter piece is passed through the manhole from the ground to the manhole bottom, and the shelter piece is assembled by connecting the shelter piece in the manhole bottom or an existing pipe connected to the manhole bottom,
The shelter is arranged such that its axis is along the longitudinal direction of the existing pipe.

  According to the above method, the divided shelter piece can be passed through the opening of the narrow manhole. By connecting the shelter pieces at the bottom of the manhole or in the existing pipe and assembling the shelter and placing the shelter on the existing pipe, it is possible to protect the workers in the shelter even if the old pipe is destroyed.

Preferably, the shelter has movement assisting means for assisting movement in the existing pipe at the bottom thereof, and moves the shelter along the longitudinal direction of the existing pipe.
According to the said method, the safety | security of the operator who moves within an existing pipe | tube can be ensured.

Preferably, the shelter is moved by being pulled through a wire.
According to the said method, a shelter can be moved smoothly, without imposing a burden on an operator.

Preferably, a pipe making machine is arranged in the existing pipe, and a rehabilitation pipe is manufactured by connecting the strips in a spiral shape by the pipe making machine, and the rehabilitation pipe is placed while the pipe making machine is positioned at the tip of the rehabilitation pipe. In the rehabilitation pipe manufacturing process for extending the pipe, the shelter is disposed in front of the pipe making machine, and the shelter is advanced as the rehabilitation pipe extends.
According to the said method, a worker's safety can be ensured in a rehabilitation pipe manufacturing process.

Another aspect of the present invention is a shelter used in an existing pipe, comprising a shelter body having a cylindrical shape and having an opening at least at one end in the axial direction, wherein the shelter body is divided into a plurality of parts in the circumferential direction and the axial direction. It is possible and the divided | segmented shelter piece is connected so that attachment or detachment is possible.
According to the said structure, a shelter piece can be assembled by passing the divided | segmented shelter piece through the opening part of a narrow manhole, and connecting a shelter piece in a manhole bottom part or an existing pipe.

Preferably, traveling assisting means for assisting movement along the existing pipe is provided at the bottom of the shelter body.
According to the said structure, a shelter can move smoothly within an existing pipe.

Preferably, the travel assisting means has a plurality of wheels rotatably attached to the bottom of the shelter body.
According to the above configuration, the shelter can move more smoothly in the existing pipe.

Preferably, the travel assisting means has a plurality of sleds attached to the bottom of the shelter body.
According to the said structure, even when the unevenness | corrugation of an inner surface is intense by aging of an existing pipe, a shelter can move smoothly.

Preferably, the shelter body has the openings at both ends in the axial direction, and a lid is pivotally attached to one end in the axial direction at the top of the shelter body, and the lid has one opening in a horizontal state. Open and close the one opening in a vertical state.
According to the above configuration, even if an existing pipe that has deteriorated due to the horizontal lid is collapsed, it can be temporarily received, and the vertical lid can suppress the intrusion of earth and sand into the shelter. Can be safe.

Preferably, the plate of the shelter piece constituting the peripheral wall of the shelter body has a plurality of wave portions extending in the circumferential direction and has a wave shape. Reinforcing ribs may be formed on the inner peripheral surface of the plate of the shelter piece constituting the peripheral wall of the shelter body.
According to the said structure, weight reduction can be achieved, maintaining the intensity | strength of a shelter piece.

  According to the present invention, the safety of an operator can be ensured in an existing pipe.

It is a schematic sectional drawing which shows the state which uses the shelter which makes 1st Embodiment of this invention in the manufacturing process of the renovated pipe in an existing pipe. It is AA arrow sectional drawing in FIG. It is a BB arrow sectional view in FIG. It is a perspective view showing roughly that the above-mentioned shelter is constituted by eight shelter pieces. It is a perspective view of the said shelter piece. It is sectional drawing which shows the other aspect of the said shelter piece. It is sectional drawing which shows the further another aspect of the said shelter piece. FIG. 4 is a view corresponding to FIG. 3 showing a shelter that constitutes a second embodiment of the present invention. It is a FIG. 3 equivalent view which shows the shelter which makes 3rd Embodiment of this invention.

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 schematically shows a construction method for rehabilitating an existing sewage pipe 1 (hereinafter referred to as an existing pipe) buried substantially horizontally in the ground.
In the ground, manholes 2a and 2b extending in the vertical direction and having the bottom connected to the existing pipe 1 are also buried. The existing pipe 1 is rehabilitated by piping the rehabilitation pipe 3 in the existing pipe 1 between the manholes 2a and 2b.

  Specifically, a drum 5 around which a strip 4 is wound is installed on the ground near one manhole 2a. The strip 4 is spirally passed through the manhole 2a and is sent into the existing pipe 1.

  A pipe making machine 6 is arranged in the existing pipe 1. The pipe making machine 6 manufactures the rehabilitated pipe 3 by connecting the strips 4 in a spiral shape. The rehabilitation pipe 3 extends along the existing pipe 1 toward the manhole 2b. The pipe making machine 6 moves forward toward the manhole 2b along with the extension of the rehabilitation pipe 3, and is always located at the tip of the rehabilitation pipe 3. This forward direction is indicated by symbol F in FIG. The strip 4 supplied to the manhole 2a is supplied to the pipe making machine 6 through the remanufactured pipe 3 already manufactured.

  A hydraulic unit 7 is disposed on the ground near the manhole 2b. The high pressure oil from the hydraulic unit 7 is sent to the pipe making machine 6 through the hydraulic pipe 7 a to drive the pipe making machine 6.

  In the pipe making process, the shelter 8 according to the present invention is used. The shelter 8 is disposed adjacent to the pipe making machine 6 in front of the pipe making machine 6 (the extending direction of the renovated pipe 3), and is advanced in accordance with the advance of the pipe making machine 6. An operator is in the shelter 8 and monitors or assists the pipe making operation by the pipe making machine 6 and performs maintenance and inspection of the pipe making machine 6.

  As shown in FIGS. 2 to 4, the shelter 8 includes a shelter body 10. The shelter body 10 has a cylindrical shape and a cross-sectional shape corresponding to the cross-sectional shape of the existing pipe 1. In this embodiment, since the cross section of the existing pipe 1 is circular, the shelter body 10 also has a circular cross section. The outer diameter of the shelter body 10 is about 100 mm smaller than the inner diameter of the existing pipe 1.

The shelter body 10 has openings 11a and 11b at both ends in the axial direction (longitudinal direction of the existing pipe 1).
As schematically shown in FIG. 4, the shelter body 10 is divided into four in the circumferential direction and two in the axial direction, and is composed of a total of eight shelter pieces 15 having the same shape. The shelter piece 15 is preferably formed of a galvanized steel plate, but may be formed of FRP.

  As shown in FIG. 5, the shelter piece 15 has an arc shape, and both end edges in the circumferential direction are formed with connecting flanges 15 a projecting radially inward, and projecting radially inward at both end edges in the axial direction. A connecting flange 15b is formed. Bolt holes (not shown) are formed in the connecting flanges 15a and 15b.

  The shelter piece 15 has a size that can pass through the manhole 2a. For example, the manhole 2a has a minimum diameter at its upper end opening, and has an inner diameter of 600 mm. On the other hand, when the axial length of the shelter body 10 is 1 m, the shelter piece 15 has a width of 500 mm and can pass through the manhole 2a.

The shelter pieces 15 adjacent to each other in the circumferential direction are connected by passing a bolt through the bolt hole of the connecting flange 15a that is abutted, and tightening the connecting flange 15a with this bolt and nut.
The shelter pieces 15 adjacent to each other in the axial direction are connected to each other by passing a bolt through a bolt hole of the connecting flange 15b that is abutted and tightening the connecting flange 15b with the bolt and the nut.

  As shown in FIGS. 2 and 3, two rubber tire-equipped wheels 20 (running assisting means) that are spaced apart from each other in the circumferential direction are rotatably attached via brackets 21 to both axial ends of the bottom of the shelter body 10. It has been. The wheel 20 is preferably provided with a stopper.

  As shown in FIG. 2, a flat plate-like base 30 extending substantially over the entire length of the shelter body 10 is installed on the bottom of the shelter body 10 so as to be substantially horizontal. Further, wire hooking portions 35 are fixed to both axial ends of the bottom of the shelter body 10.

  Since the shelter body 10 cannot pass through the manhole 2a as it is, the shelter body 10 is assembled by disassembling into a shelter piece 15 and passing through the manhole 2a and connecting it in the bottom of the manhole 2a or the existing pipe 1. . If possible, the wheel 20 may be passed through the manhole 2a in a state assembled to the shelter piece 15. Otherwise, the wheel 20 may be individually passed through the manhole 2a, and the shelter in the bottom of the manhole 2a or in the existing pipe 1. It may be assembled to the main body 10.

  In the existing pipe 1, the shelter 8 is arranged in the vicinity of the manhole 2a, and the pipe making machine 6 is arranged closer to the manhole 2a, the pipe making process of the regenerated pipe 3 is started as described above. Within the shelter 8, the worker can get on the platform 30 and work in a stable posture. A chair may be placed on the table 30 or may be used as a tool place.

  The pipe making machine 6 moves forward with the extension of the rehabilitation pipe 3, but the shelter 8 may be moved forward by the operator's human power, or the wire 9a pulled out from the winch 9 as shown by an imaginary line in FIG. The shelter 8 may be advanced by the force of the winch 9 by being hooked on the wire hook portion 35 shown in FIG. Since the shelter 8 is equipped with the wheels 20, it can move forward smoothly.

  When the rehabilitation pipe 1 is extremely aged, there is a possibility that the rehabilitation pipe 1 will collapse. However, since this fallen piece can be received at the top of the shelter 8, the safety of the worker in the shelter 8 is secured. Can be secured.

  Although the shelter piece 15 is shown in a simplified manner in FIG. 5, as shown in FIG. 6, it is preferable that the plate of the shelter piece 15 constituting the peripheral wall of the shelter 8 has a wave shape. The plurality of wave portions 15c are arranged in the axial direction of the shelter body 10 and extend in the circumferential direction. As shown in FIG. 7, a plurality of reinforcing ribs 15 d extending in the circumferential direction and a plurality of reinforcing ribs 15 e extending in the axial direction may be formed on the inner surface of the plate of the shelter piece 15 constituting the peripheral wall of the shelter 8.

Next, another embodiment of the present invention will be described with reference to the drawings. In the figure, components corresponding to those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
In the second embodiment shown in FIG. 8, a sled 25 is installed instead of the first embodiment wheel 20. The installation location of the sled 25 is the same as the installation location of the wheel 20. If the existing pipe 1 is aged and the inner surface of the pipe 1 has a large unevenness, the wheel 20 may be fitted into the recess of the inner surface of the existing pipe 1. it can.

In the embodiment shown in FIG. 9, a lid 40 is attached to one end (one end on the manhole 2 b side) of the top of the shelter 8 via a hinge 41 with a stopper. In the normal use state, the lid portion 40 is maintained horizontally by a stopper, and when the existing pipe 1 is collapsed, the lid 40 can catch fragments and earth and sand. When the stopper is released, the lid 40 rotates and hits the end surface of the shelter body 10 to close the opening 11a, so that the safety of the operator can be further enhanced. The stopper may be automatically released with a weight such as earth and sand.
The lid 40 may be sized to pass through the opening of the manhole 2a so as to block a part of the opening 11a. Alternatively, the lid 40 is divided into a plurality of lid pieces and passed through the manhole 2a, which are connected to each other. 40 may be assembled.

The present invention is not limited to the embodiment described above, and various modifications can be made without departing from the spirit of the invention.
The shelter can also be used simply for investigation and inspection of existing pipes. Also in this case, when equipped with wheels and a sled, it can move smoothly along the existing pipe.

The shelter may be installed only in a place where there is a possibility of collapse in the existing pipe. In this case, it is possible to improve safety when walking and checking the existing pipe. If it is not moved, the wheels and warp can be omitted. By pushing the padding into the bottom of the shelter or jacking up the shelter, the top of the shelter can be inscribed in the upper part of the existing pipe, and the collapse of the existing pipe can be positively prevented.
The existing pipe to be rehabilitated is not limited to the sewage pipe but may be a water pipe, a gas pipe or the like.

  The present invention is suitable for ensuring safety in existing pipes buried in the ground.

DESCRIPTION OF SYMBOLS 1 Existing pipe 2a, 2b Manhole 3 Rehabilitation pipe 4 Band plate 6 Pipe making machine 8 Shelter 9a Wire 10 Shelter main body 11a, 11b Opening 15 Shelter piece 15c Wave part 15d, 15e Reinforcement rib 20 Wheel (traveling auxiliary means)
25 Sled (driving assistance means)
35 Wire hook 40 Lid

Claims (11)

A shelter having a cylindrical shape and having an opening at least at one end in the axial direction is prepared as a plurality of shelter pieces by dividing each in the circumferential direction and the axial direction,
The shelter piece is passed through the manhole from the ground to the manhole bottom, and the shelter piece is assembled by connecting the shelter piece in the manhole bottom or an existing pipe connected to the manhole bottom,
A method for ensuring safety in an existing pipe, wherein the shelter is arranged such that its axis is along the longitudinal direction of the existing pipe.   The said shelter has a movement auxiliary means which assists the movement in the said existing pipe in the bottom part, The said shelter is moved along the longitudinal direction of the said existing pipe, The existing pipe in Claim 1 characterized by the above-mentioned. How to ensure safety.   The method of ensuring safety in an existing pipe according to claim 2, wherein the shelter is moved by towing it through a wire.   A pipe making machine is arranged in the existing pipe, and a rehabilitation pipe is manufactured by connecting the strips in a spiral shape with the pipe making machine, and the rehabilitation pipe is extended while the pipe making machine is positioned at the tip of the rehabilitation pipe. 4. The safety in an existing pipe according to claim 2, wherein in the rehabilitation pipe manufacturing process, the shelter is disposed in front of the pipe making machine, and the shelter is advanced as the rehabilitation pipe extends. How to secure. A shelter used in an existing pipe comprising a shelter body having a cylindrical shape and an opening at least at one end in the axial direction,
A shelter for an existing pipe, wherein the shelter body can be divided into a plurality of parts in the circumferential direction and the axial direction, and the divided shelter pieces are detachably connected.   The shelter for existing pipes according to claim 5, wherein travel assisting means for assisting movement along the existing pipes is provided at the bottom of the shelter body.   7. The existing pipe shelter according to claim 6, wherein the travel assisting means has a plurality of wheels rotatably attached to the bottom of the shelter body.   The existing pipe shelter according to claim 6, wherein the travel assisting means has a plurality of sleds attached to the bottom of the shelter body.   The shelter body has the openings at both ends in the axial direction, and a lid is rotatably attached to one end in the axial direction of the top of the shelter body. The said one opening is closed in a state, The existing pipe shelter in any one of Claims 5-8 characterized by the above-mentioned.   The plate of the shelter piece constituting the peripheral wall of the shelter body has a plurality of wave portions extending along the circumferential direction, and has a wave shape. Existing pipe shelter.   The existing pipe shelter according to any one of claims 5 to 9, wherein a reinforcing rib is formed on an inner peripheral surface of a plate of the shelter piece constituting the peripheral wall of the shelter body.

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