JP2022110916A - Gas pipe damage prevention method at in-site construction and gas pipe damage prevention unit - Google Patents

Abstract

To provide a gas pipe damage prevention method at in-site construction which communicates with a gas conduit at one side, and can further surely and easily prevent the leakage of a gas from a gas supply pipe remaining part even in case that a heavy machine contacts with the buried gas supply pipe remaining part embedded while being applied with block processing at an opening end at the other side, and a gas pipe damage prevention tool.SOLUTION: In a gas pipe damage prevention method at in-site construction, a gas supply pipe remaining part 42 is formed of a resin pipe having an axial line of a distance L. A rod-shaped pipe protection tool (gas pipe damage prevention unit 1) has an external peripheral part which is formed into a shape having an in-pipe space between an inner wall of the gas supply pipe remaining part 42 and itself in a pipe of the inserted gas supply pipe remaining part 42 between adjacent pipe protection tools 10 which are in arrangement states that they contact with each other. After serially inserting and accommodating the pipe protection tools 10 of the number corresponding to the distance L of the axial line into the pipe of the gas supply pipe remaining part 42 after blocking the gas supply pipe remaining part 42, block processing is applied to an end part of the gas supply part remaining part 42.SELECTED DRAWING: Figure 1

Description

In the present invention, a part of the gas supply pipe, which was buried in the premises in communication with the gas pipeline, was separated from the gas pipeline side near the boundary between the public and private areas along with the demolition of the building, etc., and then removed. A gas pipe damage prevention method and a gas pipe damage prevention unit during on-site construction work that prevent damage to the remaining gas supply pipes left on the premises in a leak-treated state due to construction work on the premises. .

As is well known, gas supply pipes are buried in privately owned areas and connected to gas pipes buried in public areas such as roads and sidewalks. , city gas is supplied to the buildings on the site. When a building is to be demolished, the gas supplier shall cut off the gas supply pipes on the premises near the boundary with the public zone before the demolition work, sandwich the cut points, and block off the pipes on the gas pipe side. After processing, remove the disconnected pipes on the building side. After removal, the rest of the buried gas supply pipe remains under the ground on the site, extending from the boundary with the public sector to the severed and blocked end of the pipe. The presence of a gas supply pipe remnant is indicated by a marking stake erected at the end of this pipe.

A demolition contractor uses heavy machinery to dismantle the building, exterior structure, etc. on the premises under the condition that the marking pile is erected and the remainder of the gas supply pipe is buried. At this time, the workers of the demolition contractor do not recognize the existence of the remaining gas supply pipes because they did not notice the marking piles or lost the marking piles in another dismantling work previously performed. There is Therefore, when excavating the earth and sand at the location of the remaining portion of the gas supply pipe, the worker may unintentionally hook and lift the remaining portion of the gas supply pipe with a heavy machine, thereby damaging it. Since the rest of the gas supply pipe communicates with the gas pipe, if the pipe is damaged by the rest of the gas supply pipe, city gas may leak from the inside of the pipe. Therefore, Patent Literature 1 discloses an example of a technology that can prevent gas leakage even if the pipe is damaged by the remainder of the gas supply pipe.

In Patent Document 1, an inner surface sealing device is moved from a pipe end on the removal side of an unused supply pipe to a branch extraction portion of a gas pipe, and a seal member is brought into close contact with the pipe wall of the branch extraction portion by the inner surface sealing device. This is a non-cutting leakage prevention method for unused supply pipes to prevent gas leakage by closing unused supply pipes by bringing sealing resin supplied from the pipe end to the front of the seal member into close contact with the pipe wall. In Patent Literature 1, after the seal resin is adhered to the pipe wall, the unnecessary pipe is cut between the part of the unused supply pipe that is closely adhered by the seal resin and the end of the pipe on the removal side.

JP-A-10-169883

However, in Patent Document 1, an inner surface sealing device is fed into the unused supply pipe from the pipe end on the removal side to the branch extraction portion of the gas pipe, and the sealing member is inflated to be brought into close contact with the pipe wall of the branch extraction portion. In addition, a series of work steps is complicated because there is a task of adhering the sealing resin supplied from the pipe end on the removal side to the front of the sealing member to the pipe wall. Moreover, in actual worksites, unused supply pipes (residual gas supply pipes) are not only buried in a straight line in the ground, but are also laid with differences in elevation or curves. At some sites, the pipes are laid with irregular shapes, and the manner of laying the rest of the gas supply pipes varies from site to site. For this reason, workers have to carry out complicated work processes for unused supply pipes that are installed irregularly and unevenly at each site. It requires a trained operator who has the necessary equipment, and the unused supply pipe cannot be closed easily.

In addition, in the technique of Patent Document 1, the sealing member that is in close contact with the pipe wall of the branch extraction part is affected by the external environment such as the influence of the ground surface temperature, underground humidity, etc., and the influence of propagating vibration. Since the tube is not securely closed, there is a risk of gas leakage.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. provides a gas pipe damage prevention method and a gas pipe damage prevention unit during on-site construction that can more reliably and easily prevent gas leakage from the rest of the gas supply pipe even in the unlikely event that heavy equipment comes into contact with it. intended to

In order to achieve the above object, a method for preventing damage to gas pipes during on-site construction according to the present invention has the following configuration.

(1) The gas supply pipe that was buried on the premises in communication with the gas pipe becomes unnecessary, and a part of the gas supply pipe is cut off on the premises in advance and removed and disposed of, and then installed on the premises. A method for preventing damage to gas pipes during on-site construction work, which prevents damage to the remaining gas supply pipes remaining on the premises in a closed state without gas leakage during construction work, wherein the remaining gas supply pipes is a resin pipe extending from the boundary with the gas pipe with an axis located at the center of its diameter at a distance L, and provided with a plurality of rod-shaped pipe protectors, the pipe protector having an axis It can be inserted into the remaining gas supply pipe with its center directed toward the axis of the remaining gas supply pipe, and between the pipe protectors adjacent to each other in contact with each other, the gas Having an outer peripheral edge formed in a shape forming an inner space between the remaining gas supply pipe and the inner wall of the remaining gas supply pipe; A number of the pipe protectors corresponding to L are inserted in series with the inner wall of the remaining portion of the gas supply pipe in an air-tight manner and accommodated, and the gas in which the pipe protectors are accommodated It is characterized by subjecting the rest of the supply pipe to a closing treatment.
(2) In the method for preventing damage to gas pipes during on-site construction work described in (1), when the pipe protectors are housed in the rest of the gas supply pipe, the pipe protectors adjacent to each other are relatively movable. It is characterized by
(3) In the method for preventing damage to gas pipes during on-site construction work described in (1) or (2), the pipe protector has connecting means connectable to the adjacent pipe protectors, and the gas supply After the remaining portion of the gas supply pipe is opened, all the pipe protectors housed in the remaining portion of the gas supply pipe are pulled out from the remaining portion of the gas supply pipe in a state of being integrally connected by the connecting means and recovered. , during recovery of the tube protectors, airtightness is maintained between the gas supply tube and the inner wall of the remaining portion of the gas supply tube by the remaining uncollected tube protector among all the tube protectors. and performing a closing process on the remainder of the gas supply pipe.

Moreover, in order to achieve the above object, a gas pipe damage prevention unit according to the present invention has the following configuration.

(4) The gas supply pipes that were buried on the premises in communication with the gas pipes became unnecessary, and some of the gas supply pipes were previously cut off on the premises and removed and disposed of, and then the gas leakage occurred. The gas pipe damage prevention unit is a gas pipe damage prevention unit that is used by being housed in the rest of the gas supply pipe left on the premises in a state where it has not been blocked, and the gas pipe damage prevention unit is protected from a plurality of pipe protectors. The pipe protector is rod-shaped, and can be inserted into the remaining gas supply pipe with its axis directed toward the axis of the remaining gas supply pipe, and is arranged adjacent to each other in contact with each other. Airtightness is achieved between the outer peripheral edge portion formed in a shape forming a pipe interior space between the pipe protectors and the inner wall of the remaining portion of the gas supply pipe, and the inner wall of the remaining portion of the gas supply pipe. characterized by having a sealing member.
(5) The gas pipe damage prevention unit described in (4) is characterized in that the pipe protector has connecting means that can be integrally connected with the adjacent pipe protector.

In the gas pipe damage prevention method and the gas pipe damage prevention unit during on-site construction work according to the present invention, gas pipes are buried under so-called public areas such as public facilities such as roads and sidewalks. Gas main pipes and gas branch pipes branching off from this gas main pipe mean pipes on the side of supplying city gas supplied by gas companies to consumers. On the other hand, gas supply pipes are buried under so-called privately owned areas, such as buildings on privately owned premises, including public facilities on public premises, and communicate with the above-mentioned gas branch pipes. It is a connected gas pipe, and means a pipe on the receiving side of a consumer to consume city gas provided through a gas branch pipe by a gas supplier.

The operation and effect of the gas pipe damage prevention method and the gas pipe damage prevention unit during on-site construction according to the present invention having the above configuration will be described.

(1) The gas supply pipe that was buried on the premises in communication with the gas pipe becomes unnecessary, and a part of the gas supply pipe is cut off on the premises in advance and removed and disposed of, and then installed on the premises. In the method for preventing damage to gas pipes remaining on the premises during construction work, the remaining gas supply pipes are , the axis located at the center of the diameter is a distance L, and it is a resin pipe extending from the boundary with the gas pipe. Between pipe protectors that are insertable into the pipe of the remaining gas supply pipe in a posture facing the axis of the remaining gas supply pipe, and that are arranged in contact with each other and are adjacent to each other, and between the inner wall of the remaining gas supply pipe. After opening the remaining part of the gas supply pipe, a number of pipe protectors corresponding to the distance L of the axis line are placed in the remaining part of the gas supply pipe, It is characterized by inserting and housing the remaining part of the gas supply pipe in an air-tight manner with the inner wall of the remaining part of the gas supply pipe, and subjecting the remaining part of the gas supply pipe in the state where the pipe protector is accommodated to be closed.

Due to this feature, even if a worker accidentally hooks and lifts the remaining gas supply pipe with a heavy machine while dismantling a building, etc. on the premises, the remaining gas supply pipe can be Although the deformation promoting portion located in the pipe inner space locally absorbs deformation due to flexure, bending, etc., the probability of large breakage is low. Therefore, if workers immediately contact the gas company immediately after lifting the rest of the gas supply pipe, the gas company rushes to the site and takes necessary measures against such a situation. Until this is done, even the deformed remaining portion of the gas supply pipe can temporarily suppress gas leakage more reliably, so that a serious situation leading to gas leakage can be effectively avoided.

Therefore, according to the method for preventing damage to gas pipes during on-site construction work according to the present invention, the rest of the gas supply pipe which communicates with the gas pipe on one side and is buried with the open end on the other side closed. On the other hand, even if a heavy machine comes into contact with the gas supply pipe, the gas leakage from the rest of the gas supply pipe can be prevented more reliably and easily.

In the method for preventing gas pipe damage during on-site construction described in (2), adjacent pipe protectors are relatively movable when housed in the rest of the gas supply pipe; characterized by

Due to this feature, the remaining portion of the gas supply pipe housing the pipe protector inside the pipe can serve as a deformation promoting portion that locally absorbs the deformation caused by the lifting of the heavy equipment, and the space inside the pipe is easily formed. Become.

In the method for preventing damage to gas pipes during on-site construction work described in (3), the pipe protector has a connection means that can be connected to an adjacent pipe protector, and after opening the rest of the gas supply pipe, the gas is supplied. All pipe protectors housed in the rest of the pipe are pulled out from the rest of the gas supply pipe in a state of being integrally connected by connecting means, and all pipe protectors are removed during collection of the pipe protectors. The remaining unrecovered tube protector is used to close the remaining portion of the gas supply pipe while maintaining an airtight seal with the inner wall of the remaining portion of the gas supply pipe.

Due to this feature, all the pipe protectors can be recovered without the gas flowing through the gas pipe leaking from the rest of the gas supply pipe, and all the recovered pipe protectors can be reused and buried at another site. It can also be used for the rest of the gas supply pipe.

(4) The gas supply pipes that were buried on the premises in communication with the gas pipes became unnecessary, and some of the gas supply pipes were previously cut off on the premises and removed and disposed of, and then the gas leakage occurred. The gas pipe damage prevention unit is a gas pipe damage prevention unit that is used by being housed in the rest of the gas supply pipe left on the premises in a state where it has not been blocked, and the gas pipe damage prevention unit is protected from a plurality of pipe protectors. The pipe protector is rod-shaped and can be inserted into the remaining gas supply pipe with its axis directed toward the axis of the remaining gas supply pipe, and protects adjacent pipes in contact with each other. having a sealing member that seals between the outer peripheral edge portion formed in a shape forming a pipe inner space between the devices and the inner wall of the remaining portion of the gas supply pipe and the inner wall of the remaining portion of the gas supply pipe; Characterized by

Due to this feature, by simply storing the gas pipe damage prevention unit according to the present invention in the remaining part of the gas supply pipe, it is possible to prevent a worker from accidentally Even if the rest of the gas supply pipe is hooked and lifted by a heavy machine, the gas flowing through the gas pipe can be easily prevented from leaking out from the rest of the gas supply pipe.

Therefore, according to the gas pipe damage prevention unit according to the present invention, one side of the gas supply pipe communicates with the gas pipe, and the open end on the other side is closed, and the rest of the buried gas supply pipe is closed. On the other hand, even if a heavy machine comes into contact with the gas supply pipe, the gas leakage from the rest of the gas supply pipe can be prevented more reliably and easily.

The gas pipe damage prevention unit described in (5) is characterized in that the pipe protector has connecting means that can be integrally connected with adjacent pipe protectors.

Due to this feature, the gas pipe damage prevention unit housed in the rest of the gas supply pipe can be recovered from the inside of the pipe and reused.

FIG. 2 is a schematic diagram for explaining a piping situation of a gas pipe to which the method for preventing gas pipe damage during construction work on the premises according to the present embodiment is applied, and is a diagram showing the rest of the gas supply pipe in a state in which the gas pipe damage prevention unit is accommodated. is. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows the gas pipe damage prevention unit which concerns on embodiment, (a) is a figure which shows a 1st pipe protector, (b) is a figure which shows a 2nd pipe protector, respectively. FIG. 4 is a first step diagram of a unit accommodation step of accommodating the gas pipe damage prevention unit in the remainder of the gas supply pipe during primary gas pipe construction, based on the gas pipe damage prevention method during on-site construction work according to the present embodiment; FIG. 10 is a diagram showing the rest of the gas supply pipe in a state of being closed; FIG. 4 is a second process drawing relating to the primary gas pipe construction following FIG. 3 ; FIG. 5 is a third process drawing relating to the first gas pipe construction following FIG. 4 ; FIG. 6 is a fourth process drawing relating to the first gas pipe construction following FIG. 5 ; FIG. 7 is a fifth process drawing relating to the primary gas pipe construction following FIG. 6 ; FIG. 8 is a sixth process drawing relating to the primary gas pipe construction following FIG. 7 ; FIG. 4 is a schematic diagram for explaining the operation of the gas pipe damage prevention method during on-site construction work according to the present embodiment, and shows a case where the rest of the gas supply pipe is hooked and lifted at a location near the closure cap. FIG. 10 is the same schematic diagram as FIG. 9 and shows a case where the rest of the gas supply pipe is hooked and lifted at a location near the public-private boundary M. FIG. FIG. 4 is a first step diagram of a unit recovery process for recovering a gas pipe damage prevention unit from a remaining portion of a gas supply pipe during secondary gas pipe construction based on the gas pipe damage prevention method during on-site construction according to the present embodiment; It is also a diagram that reproduces the 6th process chart for the primary gas pipe construction. FIG. 12 is a second process drawing relating to the secondary gas pipe construction following FIG. 11 ; FIG. 12 is a third process drawing relating to the second gas pipe construction following FIG. 12 ; FIG. 14 is a fourth process drawing relating to the secondary gas pipe construction following FIG. 13 ; FIG. 14 is a fifth process chart regarding the secondary gas pipe construction, following FIG. 14 ; FIG. 15 is a sixth process drawing regarding the secondary gas pipe construction following FIG. 15 ;

DETAILED DESCRIPTION OF THE INVENTION Embodiments of a gas pipe damage prevention method and a gas pipe damage prevention unit during on-site construction work according to the present invention will be described in detail below with reference to the drawings. In this embodiment, as an example, when demolishing a building on the premises of a privately owned area, the supply of city gas from the gas pipe to the gas supply pipe laid on the premises is cut off. Next, a method for preventing damage to gas pipes during site construction according to the present invention will be described.

FIG. 1 is a schematic diagram for explaining the condition of gas pipes to which the method for preventing gas pipe damage during on-site construction according to the present embodiment is applied. FIG. 10 is a diagram showing the remainder; As shown in FIG. 1, a gas main pipe 31 and a gas branch pipe 32 are buried in a public road 71 such as a road or sidewalk under a public area. A gas main pipe 31 and a gas branch pipe 32 form a gas pipe 30 for supplying city gas to consumers. The gas supply pipe 40 is buried within a site 72 under a privately owned area. The gas supply pipe 40 is connected to communicate with a gas branch pipe 32 branched from the gas main pipe 31 at the position of the public-private boundary M, which is the boundary between the public area and the private area. The gas supply pipe 40 is, for example, a resin pipe such as polyethylene (PE) having some degree of flexibility, which has become mainstream in recent years as a pipe forming a gas supply pipe. City gas is supplied from the gas pipe 30 through the gas supply pipe 40 to the building 74 within the site 72 .

<Overview of the first gas pipe construction>
When demolishing the building 74, the gas supplier cuts off the city gas supply from the gas branch pipe 32 to the gas supply pipe 40 before the demolition work is carried out. First gas pipe work is performed to cut the pipe 40 and close the pipe on the side of the separated gas branch pipe 32 . At this time, if there is an obstacle 75 such as an exterior structure, a plant, a storeroom, or the like in a place close to the public-private boundary M within the site 72, the gas supply pipe 40 avoids the obstacle 75, The gas supply pipe is cut at a pipe cutting point N1 located away from the boundary M, and separated into a gas supply pipe portion 41 and a gas supply pipe remainder 42 . The gas supply pipe part 41 is a pipe of the gas supply pipe 40 that extends from the pipe cut point N1 toward the building 74 side. The remaining gas supply pipe 42 is a pipe extending from the public-private boundary M to the pipe cut point N1 at a distance L (0<L) of the axis P located at the center of the diameter.

In the primary gas pipe construction, the rest of the gas supply pipe 42 is buried in the site 72 while communicating with the gas branch pipe 32. Blocking processing is performed on the portion 43 (see FIG. 3). The gas pipe damage prevention method at the time of on-site construction according to the present embodiment is a construction method that is applied to the remaining gas supply pipe 42 at the stage of performing such treatment.

Next, a method for preventing damage to gas pipes during on-site construction according to this embodiment will be described in detail. Since the method for preventing gas pipe damage during on-site construction according to this embodiment is performed using the gas pipe damage prevention unit according to this embodiment, the gas pipe damage prevention unit will be described first with reference to FIG. After that, the method for preventing gas pipe damage will be explained.

<About the pipe damage prevention unit>
FIG. 2 is a schematic diagram showing the gas pipe damage prevention unit according to the embodiment, where (a) shows the first pipe protector and (b) shows the second pipe protector.

As shown in FIGS. 1 and 2, the gas pipe damage prevention unit 1 is a tool that is housed in a pipe interior 45S of the remaining gas supply pipe 42 buried in the site 72 and used. The gas pipe damage prevention unit 1 includes a plurality of rod-shaped pipe protectors 10 each having a disk-shaped or cylindrical cross-section (in this embodiment, the number of pipe protectors 10 is four as shown in FIG. 8, etc.) arranged in a row. used. The tube protector 10 has an outer peripheral edge portion formed in a shape forming a tube inner space 45Sa between the tube protectors 10, 10 adjacent to each other while being in contact with each other and the inner wall 44 of the gas supply tube remainder 42. 14. Further, the tube protector 10 has connecting means that can be integrally connected to the adjacent tube protectors 10. In this embodiment, the connecting means are the female threaded portion 17 and the paired male threaded portion 16. It is a screw fastening with

A specific description will be given. The pipe protector 10 can be inserted into the pipe interior 45S of the remaining gas supply pipe 42 with its axis K directed toward the axis P of the remaining gas supply pipe 42. It is a rod in which an outer peripheral base portion 13 is formed with an outer diameter that can secure a predetermined gap within an allowable range between and. The pipe protector 10 is made of resin such as polyethylene (PE). It has been learned through numerous experiments that the length of each tube protector 10 is generally within the range of 250 to 500 mm, and preferably about 300 mm is the optimum length.

As shown in FIG. 2, the pipe protector 10 includes a first pipe protector 11 that is first inserted into the pipe interior 45S of the remaining gas supply pipe 42 as the head of the gas pipe damage prevention unit 1, and a first pipe protector 11 and a second pipe protector 12 that is inserted into the pipe 45S to the end of the gas pipe damage prevention unit 1.

As shown in FIG. 2( a ), the first pipe protector 11 has a sealing member 15 on the outer peripheral base portion 13 for airtightly sealing with the inner wall 44 of the remaining gas supply pipe portion 42 . The front end side, which is one end side in the direction of the axis K (the left side in FIG. 2A), remains as the outer peripheral base portion 13 . The sealing member 15 is an O-ring or the like made of a material suitable for sliding against the inner wall 44 of the remaining portion 42 of the gas supply pipe. A lubricant may be applied to the seal member 15 in order to improve the sliding of the seal member 15 with respect to the inner wall 44 . In addition, the rear end side of the first tube protector 11 in the direction of the axis K (the right side in FIG. 2(a)) is the outer peripheral edge portion 14, and the outer peripheral edge portion 14 is the outer peripheral base portion. It is formed in a shape that gradually narrows while forming an R-shaped contour toward the side away from 13 . A female screw portion 17 is screwed to the outer peripheral edge portion 14 .

As shown in FIG. 2B, the second tube protector 12 has outer peripheral edge portions 14 on both sides in the direction of the axis K sandwiching the outer peripheral base portion 13 . The outer peripheral edge portion 14 is formed in a shape that tapers away from the outer peripheral base portion 13 while forming an R-shaped outline and gradually decreasing in diameter. A male threaded portion 16 is screwed to the outer peripheral edge portion 14 on one end side in the direction of the axis K (left side in FIG. 2(b)), and the other end side in the direction of the axis K (in FIG. 2(b)) , right side), a female screw portion 17 is screwed.

<Overview of methods to prevent damage to gas pipes during construction on site>
Next, a method for preventing gas pipe damage during on-site construction according to this embodiment will be described. The method for preventing gas pipe damage during on-site construction according to the present embodiment includes a unit housing step of housing the gas pipe damage prevention unit 1 in the gas supply pipe remaining portion 42 during primary gas pipe construction, and a secondary gas pipe and a unit recovery step of recovering the gas pipe damage prevention unit 1 housed in the remaining gas supply pipe portion 42 during construction.

<Regarding the unit storage process>
In the unit accommodation step, after the remaining gas supply pipe 42 is opened during the primary gas pipe construction, a number corresponding to the distance L of the axis P (4 in this embodiment) is placed in the pipe interior 45S of the remaining gas supply pipe 42 1) is inserted in series with the inner wall 44 of the remaining gas supply pipe 42 air-tight and accommodated.

FIG. 3 shows the first step of the unit accommodation step of accommodating the gas pipe damage prevention unit in the remainder of the gas supply pipe during primary gas pipe construction, based on the gas pipe damage prevention method during on-site construction according to the present embodiment. FIG. 10 is a view showing the remaining part of the gas supply pipe after the closing process has been performed; The second process chart is shown in FIG. 4, the third process chart is shown in FIG. 5, the fourth process chart is shown in FIG. 6, the fifth process chart is shown in FIG. 7, and the sixth process chart is shown in FIG.

A specific description will be given. As described above, in the primary gas pipe construction, when the gas supply pipe 40 is cut and separated into the gas supply pipe portion 41 and the gas supply pipe remaining portion 42, the city gas is discharged into the remaining gas supply pipe portion 42. In order to prevent leakage from 45S, as shown in FIG. 3, end portion 43 is subjected to squeeze-off 48 to temporarily close remaining portion 42 of gas supply pipe.

In carrying out the unit housing step, as shown in FIG. 4, the front end side of the first pipe protector 11, which is the top of the gas pipe damage prevention unit 1, is squeezed off 48 from the end 43 of the remaining gas supply pipe portion 42. Insert it to the front. At this time, the seal member 15 of the first pipe protector 11 is brought into close contact with the inner wall 44 of the remaining portion 42 of the gas supply pipe. When the sealing member 15 is in close contact with the inner wall 44, the closing process by the squeeze-off 48 is released.

The city gas exists in the pipe interior 45S of the remaining gas supply pipe 42, but the flow of the city gas to the end 43 is blocked by the sealing member 15. Therefore, as shown in FIG. Even if the blockage is completely released, the city gas flowing through the inside of the pipe 45S will not leak outside through the end portion 43 .

Next, as shown in FIG. 6 , following the first pipe protector 11 , the first second pipe protector 12 is attached from the front end side where the male threaded portion 16 is located to the end portion 43 of the remaining gas supply pipe 42 . insert into After that, following the first second pipe protector 12, the second second pipe protector 12 is inserted into the end portion 43 of the gas supply pipe remaining portion 42 from the front end side where the male screw portion 16 is located. do. Similarly, following the second second pipe protector 12, the third second pipe protector 12 is inserted into the end portion 43 of the remaining gas supply pipe portion 42 from the front end side where the male screw portion 16 is located. do.

As a result, as shown in FIG. 7, as a gas pipe damage prevention unit 1, a total of four pipe protectors 10 (one first pipe protector 11 and three second pipe protectors 12) It is inserted into the pipe interior 45S of the supply pipe remainder 42 and accommodated in a serial arrangement form. The first pipe protector 11, which is the head of the gas pipe damage prevention unit 1, is inserted into the pipe interior 45S of the remaining gas supply pipe 42 to a position close to the public-private boundary M. As shown in FIG. At this time, when the gas pipe damage prevention unit 1 is accommodated in the remaining gas supply pipe portion 42, the adjacent pipe protectors 10, 10 (the first pipe protector 11 and the second pipe protector 12, both of which are the second The pipe protector 12) is not connected by the male threaded portion 16 and the female threaded portion 17, and is in a state of being able to move relative to each other.

Next, as shown in FIG. 8, the end 43 of the remaining gas supply pipe 42 in which the gas pipe damage prevention unit 1 is housed is closed with a closing cap 49 by fusion. It should be noted that the end portion 43 may be cut off when removing the closing cap 49 in the unit recovery process, which will be described later. In this case, the second pipe protector 12 at the end of the gas pipe damage prevention unit 1 is placed between the second pipe protector 12 and the closing cap 49 so as to secure a space for the cut portion. In order to avoid this, it is preferable to dispose at a position slightly away from the closing cap 49 .

Next, as shown in FIG. 1, a marker stake 73 is erected at a site 72 where the pipe cut point N1 exists to indicate the presence of the remaining gas supply pipe 42 . Thus, as a preparatory work for demolition work of the building 74 and the like, the first gas pipe construction involving the unit accommodation process is completed by the gas pipe damage prevention method during site construction according to the present embodiment.

Here, in the site 72 where the first gas pipe work has been completed, a demolition contractor uses heavy machinery to dismantle the building 74, etc., while the remaining gas supply pipe 42 undergoes a unit accommodation process. 9 and 10, the effect on the remaining gas supply pipe 42 due to the implementation will be described. 9 and 10 are schematic diagrams for explaining the action of the method for preventing gas pipe damage during on-site construction according to this embodiment.

While the demolition contractor is carrying out the demolition work of the building 74 and the like in the site 72 where the first gas pipe work has been completed, the worker digs up the earth and sand at the location of the remaining gas supply pipe 42. 9 and 10, the gas supply pipe rest 42 may be erroneously lifted by heavy machinery due to reasons such as ignorance of the presence of the marking stake 73 or loss of the marking stake 73. . The remaining gas supply pipe 42 is in a state in which the gas pipe damage prevention unit 1 is accommodated in a pipe 45S made of polyethylene or the like. In such a case, even if the rest of the buried gas supply pipe 42 is lifted by a heavy machine, in the portion of the rest of the gas supply pipe 42 where the outer circumference base 13 of the pipe protector 10 is located, the outer circumference base 13 will not be exposed to the gas. It functions as the core of the supply pipe remainder 42 . Therefore, compared to the hollow state of the remaining gas supply pipe 42 alone, the pipe itself becomes a so-called rigid body and is less likely to deform greatly.

On the other hand, in the gas pipe damage prevention unit 1, between the outer peripheral edge portions 14, 14 of the pipe protectors 10, 10 adjacent to each other in contact with each other, there is a As a part of the space, a pipe inner space 45Sa that protrudes from the inner wall 44 of the remaining gas supply pipe 42 toward the axis P can be secured. Moreover, in the pipe interior 45 of the remaining gas supply pipe 42 , the gas pipe damage prevention unit 1 is closed with the closing cap 49 at the rear end side (right side in FIGS. 9 and 10 ) of the end portion 43 . Since the seal member 15 is in close contact with the inner wall 44 at the front end side (the left side in FIGS. 9 and 10), the gas pipe damage prevention unit 1 is accommodated in the pipe 45 while its movement is restricted. It is

Therefore, even if the gas supply pipe rest 42 is lifted, the gas pipe damage prevention unit 1 is housed in the pipe 45S of the gas supply pipe rest 42 without moving, and the gas supply pipe rest 42 is exactly in the pipe inner space. A portion located at 45Sa serves as a local deformation promoting portion 46 . Since the gas supply pipe rest 42 itself has flexibility, the gas supply pipe rest 42 is actively bent and deformed at the deformation promoting portion 46 as shown in FIGS. become. Moreover, the outer peripheral edge portion 14 of the pipe protector 10 has a rounded shape with an R-shaped contour.

Therefore, damage to the remaining gas supply pipe 42 due to contact with the pipe protector 10 can be suppressed. Further, even if damage such as deformation or rupture of the remaining gas supply pipe 42 occurs to some extent in the deformation promoting portion 46, the leakage of the city gas flowing through the gas branch pipe 32 can be prevented by the first pipe protector 11. The sealing member 15 of (tube protector 10) can easily prevent this. Therefore, even if a worker of a demolition contractor accidentally hooks and lifts the remaining gas supply pipe 42 with a heavy machine, the deformed remaining gas supply pipe 42 temporarily prevents gas leakage. Therefore, the worker can immediately contact the gas company and have the gas company take necessary measures to avoid a serious situation that may lead to a gas leak.

<Regarding the unit collection process>
Next, the unit recovery process of the gas pipe damage prevention method during on-site construction according to the present embodiment will be described. In the unit recovery process, after opening the remaining gas supply pipe 42 during the secondary gas pipe construction, all four pipe protectors 10 (gas pipe damage prevention unit 1) housed in the remaining gas supply pipe 42 are removed. are pulled out from the remaining portion 42 of the gas supply pipe in a state of being integrally connected by the connecting portion 18 (connecting means) and recovered. During recovery of the tube protectors 10, the first uncollected tube protector 11, which is the remaining one of all the four tube protectors 10, maintains airtightness with the inner wall 44 of the remaining gas supply tube 42. While standing still, the remaining portion 42 of the gas supply pipe is closed.

FIG. 11 is a first step diagram of a unit recovery process for recovering a gas pipe damage prevention unit from the remainder of the gas supply pipe during secondary gas pipe construction, based on the method for preventing gas pipe damage during construction on site according to the present embodiment. It is also a diagram that reproduces the 6th process chart for the first gas pipe construction. The second process chart for the second gas pipe construction is shown in Figure 12, the third process chart in Figure 13, the fourth process chart in Figure 14, the fifth process chart in Figure 15, and the sixth process chart FIG. 16 shows each.

A specific description will be given. As described above, by the primary gas pipe construction, the end portion 43 of the remaining gas supply pipe 42 is closed with the closing cap 49 with the gas pipe damage prevention unit 1 housed in the pipe interior 45S, as shown in FIG. blocked by In the secondary gas pipe construction, first, as shown in FIG. 12 is rotated about the axis K in the screw fastening direction R. The first pipe protector 11 has the seal member 15 in close contact with the inner wall 44 of the remaining gas supply pipe 42, and is not rotated in the screw tightening direction R and is in an immovable state. When the rotation of the second tube protector 12 at the end is transmitted to the second second tube protector 12 immediately before it, the first second tube protector 12 following the first tube protector 11, It is also transmitted to the first pipe protector 11 .

As a result, the male threaded portion 16 of the second tube protector 12 at the end and the female threaded portion 17 of the second tube protector 12 at the second end are tightened, so that the second tube protector 12 at the end and the second tube protector 12 are tightened. The two tube protectors 12 are connected at the connecting portion 18 . Similarly, by fastening the male threaded portion 16 of the second tube protector 12 and the female threaded portion 17 of the first second tube protector 12, the two second tube protectors 12 and 1 The second tube protector 12 is connected at the connecting portion 18 . Similarly, by fastening the male threaded portion 16 of the first second tube protector 12 and the female threaded portion 17 of the first tube protector 11, the first second tube protector 12 and the first tube protector are connected. 11 are connected at a connecting portion 18 . Thus, the four pipe protectors 10 form the gas pipe damage prevention unit 1 that is integrally connected via the connecting portion 18 .

Next, as shown in FIG. 13, the second pipe protector 12 at the end is grasped from the end 43 of the remaining gas supply pipe 42, and the gas pipe damage prevention unit 1 is pulled forward F, and as shown in FIG. Then, the end second pipe protector 12 and the second second pipe protector 12 are disconnected, and the last second pipe protector 12 is removed from the gas pipe damage prevention unit 1 . Following this, in the same manner, the second tube protector 12 is gripped and pulled toward the front side F, and the second tube protector 12 and the first second tube protector 12 is disconnected, and the second second pipe protector 12 is removed from the gas pipe damage prevention unit 1. Similarly, the first second tube protector 12 is grasped and the connection between the first second tube protector 12 and the first tube protector 11 drawn toward the front side F is released. Remove the first second tube protector 12 from the tube damage prevention unit 1 .

Next, as shown in FIG. 15, when only the first pipe protector 11 is placed at the end 43 of the remaining gas supply pipe 42, the front side (left side in FIG. 15) of the first pipe protector 11 is , the end portion 43 is subjected to a squeeze-off 48 to completely close the remaining portion 42 of the gas supply pipe. After closing, as shown in FIG. 16, the first pipe protector 11 is taken out from the end portion 43 of the remaining gas supply pipe portion 42 . Thus, after the demolition work of the building 74 or the like, the gas pipe damage prevention unit 1 is recovered from the pipe interior 45S of the remaining gas supply pipe 42, and the unit recovery step is performed by the gas pipe damage prevention method during construction on the site according to the present embodiment. The secondary gas pipe work with

If the obstacle 75 near the public-private boundary M disappears after the demolition work of the building 74 is completed, as shown in FIG. In some cases, the remaining gas supply pipe 42 is cut at the additional pipe cutting point N2 close to M, and the end 43 on the side of the gas branch pipe 32 is squeezed off 48 . In this case, of the residual gas supply pipe 42, the unused pipe portion 47 that is between the pipe cut portion N1 and the additional pipe cut portion N2 is discarded.

Next, the gas pipe damage prevention method at the time of on-site construction according to the present embodiment and the action and effect of the gas pipe damage prevention unit 1 will be described.

In the method for preventing damage to the gas pipe during construction on the premises according to the present embodiment, the gas supply pipe 40, which communicates with the gas pipe 30 and is buried in the premises 72, becomes unnecessary. A part of the pipe 41 is previously cut and disposed of within the site 72, and then left within the site 72 in a state of being closed without gas leakage during construction work performed within the site 72. - 特許庁In the method for preventing damage to the gas pipe during on-site construction, the remaining gas supply pipe 42 extends from the boundary with the gas pipe 30 at a distance L from the axis P located at the center of the diameter. A plurality of rod-shaped pipe protectors 10 are provided, and the pipe protectors 10 are positioned so that their axis K is directed toward the axis P of the remaining gas supply pipe 42, and the remaining gas supply pipe 42. 42, and formed in a shape that forms a pipe inner space 45Sa with the inner wall 44 of the remaining gas supply pipe 42 between the pipe protectors 10, 10 that are adjacent to each other while being in contact with each other. After the remaining gas supply pipe 42 is opened, a number of pipe protectors 10 corresponding to the distance L of the axis P are placed in the pipe interior 45S of the remaining gas supply pipe 42 for gas supply. It is characterized by inserting and housing the remaining pipe portion 42 in series with the space between it and the inner wall 44 airtight, and subjecting the remaining gas supply pipe portion 42 in a state in which the pipe protector 10 is housed to a closing process. do.

Due to this feature, during the dismantling work of the building 74 and the like on the site 72 where the first gas pipe construction has been completed, if by any chance a worker accidentally hooks the remaining gas supply pipe 42 with a heavy machine, Even if it is lifted, it is possible to more reliably prevent city gas flowing through the gas branch pipe 32 from leaking from the gas supply pipe rest 42 . In particular, when the remaining flexible gas supply pipe 42 is lifted from the soil in the site 72 by heavy equipment, the deformation promoting portion 46 of the remaining gas supply pipe 42 where the pipe inner space 45Sa is located is deformed. Although it locally absorbs deformation due to flexure, bending, etc., the probability of large breakage is low. Therefore, if the worker promptly contacts the gas company immediately after lifting the remaining gas supply pipe 42, the gas company rushes to the site and takes necessary measures against such a situation. Since it is possible to temporarily suppress gas leakage even with the deformed remaining portion 42 of the gas supply pipe, it is possible to effectively avoid a serious situation leading to gas leakage.

Therefore, according to the method for preventing damage to the gas pipe during construction on the premises according to the present embodiment, one side of the gas pipe communicates with the gas pipe 30, and the open end on the other side is closed and buried. Even in the unlikely event that heavy machinery comes into contact with the remaining pipe portion 42, gas leakage from the remaining gas supply pipe portion 42 can be more reliably and easily prevented.

In addition, in the method for preventing gas pipe damage during on-site construction work according to the present embodiment, the adjacent pipe protectors 10, 10 are relatively movable when housed in the remaining gas supply pipe portion 42. It is characterized by

Due to this feature, the remaining portion 42 of the gas supply pipe housing the gas pipe damage prevention unit 1 in the pipe 45S can serve as a deformation promoting portion 46 that locally absorbs the deformation caused by lifting the heavy equipment. Space 45Sa is easily formed.

Further, in the method for preventing gas pipe damage during on-site construction work according to the present embodiment, the pipe protector 10 has connection means (female screw portion 17 and male screw portion 16) that can be connected to adjacent pipe protectors 10. After opening the gas supply pipe rest 42, all the pipe protectors 10 (gas pipe damage prevention units 1) housed in the gas supply pipe rest 42 are secured by the female threaded portion 17 and the male threaded portion 16. Collecting the pipe protectors 10 by pulling them out from the remaining gas supply pipe 42 in a state of being integrally connected, and removing the uncollected pipe protector 10 ( The remaining gas supply pipe 42 is closed while airtightness is maintained between the remaining gas supply pipe 42 and the inner wall 44 by the first pipe protector 11).

Due to this feature, the gas pipe damage prevention unit 1 can be recovered without the city gas flowing through the gas branch pipe 32 leaking from the remaining gas supply pipe 42, and the recovered gas pipe damage prevention unit 1 can be reused for another purpose. It can also be used for the rest of the gas supply pipe 42 buried on site. In addition, demand for city gas arises due to reasons such as the construction of new buildings in the site 72 where the demolition work of the building 74 etc. has been completed, and as shown in FIG. In the case of reusing the remaining gas supply pipe 42 and connecting it to a gas supply pipe to be laid on the side of a new building, etc., the gas pipe damage prevention unit 1 is considered to be a hindrance factor in performing this work. not.

On the other hand, the gas pipe damage prevention unit 1 according to the present embodiment eliminates the need for the gas supply pipe 40 that communicates with the gas pipe 30 and is buried in the site 72. After the part 41 has been previously cut and removed within the site 72, it is housed in the pipe 45S of the remaining gas supply pipe 42 left within the site 72 in a state of being closed without gas leakage. The gas pipe damage prevention unit 1 is composed of a plurality of pipe protectors 10. The pipe protectors 10 are rod-shaped, and their axis K is aligned with the axis P of the remaining gas supply pipe 42. It can be inserted into the pipe interior 45S of the remaining gas supply pipe 42 in a posture directed to the side, and the inner wall 44 of the remaining gas supply pipe 42 and the inner wall 44 of the remaining gas supply pipe 42 can be inserted between the pipe protectors 10, 10 adjacent to each other in contact with each other. It is characterized by having a seal member 15 for making airtight between the outer peripheral edge portion 14 formed in a shape forming a pipe inner space 45Sa therebetween and the inner wall 44 of the remaining portion 42 of the gas supply pipe.

Due to this feature, by simply housing the gas pipe damage prevention unit 1 in the pipe 45S of the remaining gas supply pipe 42, the demolition work of the building 74 and the like can be carried out within the site 72 where the primary gas pipe construction has been completed. Even if an operator accidentally hooks and lifts the remaining gas supply pipe 42 with a heavy machine during operation, the city gas flowing through the gas branch pipe 32 is prevented from leaking out from the remaining gas supply pipe 42. , can be easily prevented.

Therefore, according to the gas pipe damage prevention unit 1 according to the present embodiment, one side of the gas supply pipe is communicated with the gas pipe 30, and the remaining open end of the gas supply pipe 42, which is buried on the other side by being closed, is closed. On the other hand, even in the event that a heavy machine comes into contact with it, it is possible to more reliably and easily prevent gas leakage from the gas supply pipe rest 42, which is an excellent effect.

Further, in the gas pipe damage prevention unit 1 according to the present embodiment, the tube protectors 10 are arranged such that the adjacent tube protectors 10 (the first tube protector 11 and the second tube protector 12, the second tube protectors 12, 12 and connecting means (female threaded portion 17 and male threaded portion 16) that can be integrally connected.

Due to this feature, the gas pipe damage prevention unit 1 housed in the remaining gas supply pipe portion 42 can be recovered from the pipe interior 45S and reused.

In the above, the present invention has been described in accordance with the embodiments, but the present invention is not limited to the above embodiments, and can be modified and applied as appropriate without departing from the scope of the invention.

(1) For example, in the embodiment, the adjacent tube protectors 10, 10 are connected and connected by screwing the female threaded portion 17 and the male threaded portion 16, but the connecting means for the adjacent tube protectors is , can be changed as appropriate without being limited to the embodiment.

That is, the connection means may be, for example, a wire, rope, chain, U-shaped or annular engaging member that can freely connect or disconnect one tube protector and the other tube protector. may be provided on one tube protector and the other tube protector, respectively, so that the two engaging members can be freely engaged or disengaged from each other. With such a connecting means, it is possible to supply gas even at a site where the rest of the gas supply pipe is laid in a straight line in the ground, but also at a site where the pipe is laid with a difference in elevation or a bend in the pipe. Since the pipe protector can be accommodated in the pipe and recovered from the pipe, the gas pipe damage prevention method according to the present invention during on-site construction can be applied.

(2) In addition, in the embodiment, as shown in FIG. It is not limited to the embodiment as long as it is formed in a shape that forms a space inside the pipe between it and the inner wall of the rest of the gas supply pipe.

(3) In the embodiment, the number of tube protectors 10 accommodated in the pipe interior 45S of the remaining gas supply pipe 42 is illustrated as four, but the number of tube protectors is not limited to the embodiment. do not have. That is, when setting the number of pipe protectors to be accommodated in the remaining gas supply pipe, the length of each pipe protector and the axial distance L of the remaining gas supply pipe are taken into consideration. The total length of the prevention unit is made smaller than the axial distance L. Since the gas pipe damage prevention unit has a plurality of pipe protectors arranged in series, the number of pipe protectors that can be accommodated in the pipe is limited to the number of gas pipe damage prevention units in which the plurality of pipe protectors are integrally connected. is a number that does not exceed the total length of the

1 gas pipe damage prevention unit 10 pipe protector 14 outer peripheral edge 15 sealing member 16 male screw (connecting means)
17 female screw (connection means)
18 connection part (connection means)
30 Gas pipe 40 Gas supply pipe 41 Gas supply pipe part 42 Gas supply pipe remaining part 44 Inner wall 45S Pipe interior 45Sa Pipe interior space 72 Site K Axis M Public-private boundary (boundary)
P-axis

Claims (5)

The gas supply pipes that were buried on the premises in communication with the gas pipes became unnecessary, and some of the gas supply pipes were cut off on the premises in advance and removed and disposed of, and then construction work on the premises was started. In the method for preventing damage to gas pipes at the time of site construction, which prevents damage to the rest of the gas supply pipes remaining on the site while it is closed without gas leakage during implementation,
The rest of the gas supply pipe is a resin pipe extending from the boundary with the gas pipe with an axis located at the center of the diameter at a distance L,
A plurality of rod-shaped pipe protectors are provided, and the pipe protectors can be inserted into the remaining gas supply pipe and are in contact with each other in a posture with their axes directed toward the axis of the remaining gas supply pipe. having an outer peripheral edge formed in a shape forming a pipe inner space between the pipe protectors that are adjacent to each other in a state of being arranged in such a manner that they are separated from the inner wall of the remaining portion of the gas supply pipe;
After the rest of the gas supply pipe is opened, a number of the pipe protectors corresponding to the distance L of the axis line are placed in the rest of the gas supply pipe so as to air-tightly connect with the inner wall of the rest of the gas supply pipe. inserting and accommodating in series with
subjecting the remainder of the gas supply pipe in the state where the pipe protector is housed,
A method for preventing gas pipe damage during on-site construction, characterized by: In the method for preventing gas pipe damage during construction on the site according to claim 1,
the adjacent pipe protectors are relatively movable when housed in the gas supply pipe rest;
A method for preventing gas pipe damage during on-site construction, characterized by: In the method for preventing damage to gas pipes during construction on site according to claim 1 or claim 2,
The tube protectors have connection means that can be connected to adjacent tube protectors,
After opening the rest of the gas supply pipe, all the pipe protectors housed in the rest of the gas supply pipe are pulled out from the rest of the gas supply pipe in a state of being integrally connected by the connecting means. to retrieve
During recovery of the tube protectors, the airtightness between the inner wall of the remaining part of the gas supply tube is maintained by the remaining uncollected tube protector among all the tube protectors, subjecting the rest of the gas supply pipe to a closing process;
A method for preventing gas pipe damage during on-site construction, characterized by: A gas supply pipe that has been buried in the premises in communication with the gas pipe becomes unnecessary, and a part of the gas supply pipe is previously cut off in the premises and removed and disposed of, and then closed without gas leakage. A gas pipe damage prevention unit that is used by being housed in the remaining gas supply pipe left on the premises in a state where it has been subjected to
The gas pipe damage prevention unit is composed of a plurality of pipe protectors, each of which is a rod-like pipe protector, and which has a posture in which its axis is directed toward the axis of the remaining gas supply pipe. an outer peripheral edge portion formed in a shape that can be inserted into the gas supply pipe and forms a pipe inner space between the pipe protectors that are adjacent to each other in a contacting state and with the inner wall of the remaining portion of the gas supply pipe; having a sealing member that seals the gap between the remaining part of the gas supply pipe and the inner wall;
A gas pipe damage prevention unit characterized by: In the gas pipe damage prevention unit according to claim 4,
The tube protectors have connection means that can be integrally connected with the adjacent tube protectors;
A gas pipe damage prevention unit characterized by:

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