JP2016191215A - Pipe-roof construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe-roof construction method capable of shortening a construction period of the pipe-roof construction method, and capable of suppressing increase in a deformation amount of a buried pipe body.SOLUTION: A pipe-roof construction method of this invention for jacking a plurality of pipe bodies in a lateral direction and burying them includes a temporary connecting step for temporarily connecting a preceding pipe body 2 buried in a front side of a jacking direction X and a succeeding pipe body 3 buried in a rear side of the jacking direction X and jacking them underground, and a regular connecting step for regularly connecting the temporarily connected preceding pipe body and the succeeding pipe body in the state of being buried underground. In the temporary connecting step, a rear end 2a of the preceding pipe body 2 and a front end 3a of the succeeding pipe body 3 are joined by a connecting member 6 extending in the jacking direction X and are temporarily connected after jacking a part of the preceding pipe body 2 underground. In the regular connecting step, the rear end 2a of the preceding pipe body 2 and the front end 3a of the succeeding pipe body 3 are joined by welding and are regularly connected after jacking the preceding pipe body 2 and the succeeding pipe body 3 underground in the state of being temporarily connected.SELECTED DRAWING: Figure 11

Description

  The present invention relates to a pipe roof construction method for embedding a plurality of tubular bodies by propelling them laterally.

  Conventionally, the number of steel pipes to be inserted can be reduced, and two pipes can be inserted at a time. Further, since the outer periphery is not disturbed, even when performing manual digging, etc., it is possible to efficiently remove soil, thereby shortening the construction period. The pipe roof construction method disclosed in Patent Document 1 has been proposed.

  The pipe roof method disclosed in Patent Document 1 is a pipe roof method in which steel pipes to be inserted into a natural ground are arranged in a parallel state. In the steel pipe, the two steel pipes arranged in parallel are spaced apart by an upper floor plate. An integrally connected connecting steel pipe, and in front of the connecting steel pipe, two parallel steel pipes and an elliptical hood blade that collectively surrounds the front of the upper floor plate are provided, and the hood blade portion The earth and sand excavated in the above is transported in the space below the upper floor board.

JP 2008-038530 A

  In particular, the pipe roof method disclosed in Patent Document 1 sets the hood blade at the front of the connecting steel pipe, and then discharges the earth and sand excavated by the hood blade with a belt conveyor and connects to the gap. The steel pipe is propelled by a propulsion jack, and the connecting steel pipe is added by welding or bolt joining in order to ensure an appropriate length in the propulsion direction of the connecting steel pipe.

  However, in the pipe roof method disclosed in Patent Document 1, if the connecting steel pipe is to be added by welding in order to ensure an appropriate length in the propulsion direction of the connecting steel pipe, welding per place for adding the steel pipe is performed. In the work, the work time of 5 hours to 6 hours or more is usually required. At this time, the pipe roof construction method disclosed in Patent Document 1 needs to stop the propulsion of the connection steel pipe by the propulsion jack for 5 to 6 hours or more for each welding work when adding the connection steel pipe. There was a problem that it was difficult to shorten the construction period.

  In addition, the pipe roof construction method disclosed in Patent Document 1 does not require welding work when adding the connecting steel pipe if the connecting steel pipe is added by bolt joining, so the propulsion of the connecting steel pipe by the propulsion jack is stopped. Therefore, it is possible to shorten the work period of the pipe roof construction method. However, at this time, the pipe roof construction method disclosed in Patent Document 1 requires a slight clearance for connecting steel pipes because of a mechanical joint using bolts, and the bolts are inserted into holes through which the bolts are inserted. Therefore, it is necessary to secure a gap for the connection, and the connecting steel pipe is easily bent due to the overload at the connecting place and the bolt joining place between the steel pipes. For this reason, there is a problem in that when the connecting steel pipe is excavated below the connecting steel pipe and an earth load or an overlying load is applied to the connecting steel pipe, the deformation amount of the connecting steel pipe increases.

  Therefore, the present invention has been devised in view of the above-mentioned problems, and the object of the present invention is to shorten the work period of the pipe roof construction method and to increase the deformation amount of the embedded pipe body. An object of the present invention is to provide a pipe roof construction method that can be suppressed.

  The pipe roof construction method according to the first invention is a pipe roof construction method for embedding a plurality of pipe bodies in the lateral direction, and a preceding pipe body buried in the front side in the propulsion direction, and a rear side in the propulsion direction. A temporary connecting step of temporarily connecting a trailing pipe embedded on the side and propelling it into the ground, and the temporarily connected preceding pipe and the succeeding pipe in a state embedded in the ground A main connection step, and in the temporary connection step, after a part of the preceding tubular body is propelled into the ground, a rear end portion of the preceding tubular body and a front end portion of the succeeding tubular body Are joined by a connecting member extending in the propulsion direction and temporarily connected, and in the main connection step, the preceding tube and the succeeding tube are propelled into the ground while being temporarily connected, The rear end portion of the preceding tubular body and the front end portion of the succeeding tubular body are joined and joined together by welding.

  In the pipe roof construction method according to a second aspect of the present invention, in the first aspect, in the temporary connection step, the joining surface of the rear end portion of the preceding tubular body and the joining surface of the front end portion of the succeeding tubular body are opposed to each other. Then, the connecting member is provided by erection from the front side joint part projecting inward from the inner surface of the preceding tubular body to the rear side joint part projecting inward from the inner surface of the succeeding pipe body, The rear end portion of the preceding tubular body and the front end portion of the succeeding tubular body are temporarily connected.

  The pipe roof construction method according to a third aspect of the present invention is the first aspect or the second aspect, wherein, in the temporary connection step, a joining surface of a rear end portion of the preceding tubular body and a joining surface of a front end portion of the succeeding tubular body Are formed in a substantially flat shape from a front joint that protrudes inward from the inner surface of the preceding tubular body to a rear joint that projects inward from the inner surface of the succeeding tubular body. By laying the connecting member, the rear end portion of the preceding tubular body and the front end portion of the succeeding tubular body are temporarily connected by friction bonding or supporting pressure bonding with the plurality of connecting members. It is characterized by that.

  In the pipe roof construction method according to a fourth aspect of the present invention, in any one of the first to third aspects of the present invention, in the main connection step, the pipe is connected in the pipe circumferential direction of the preceding pipe and the succeeding pipe. By joining the joining surface of the end portion and the joining surface of the front end portion of the succeeding tube body from the inside of the preceding tube body and the succeeding tube body by welding, the preceding member is removed. The rear end portion of the tubular body and the front end portion of the succeeding tubular body are fully connected.

  A pipe roof construction method according to a fifth invention is the pipe roof construction method according to any one of the first invention to the fourth invention, wherein, in the main connection step, a plurality of the connecting members are provided in a pipe circumferential direction of the preceding pipe body and the succeeding pipe body. Prior to the gap formed by being mounted apart from each other, the joining surface of the rear end portion of the preceding tubular body and the joining surface of the front end portion of the succeeding tubular body are joined by welding, After removing a plurality of the connecting members, by joining the places where the connecting members are attached by welding, the rear end portion of the preceding tubular body and the front end portion of the succeeding tubular body, It is characterized by being connected.

  In the pipe roof construction method according to a sixth aspect of the present invention, in any one of the first to fifth aspects of the present invention, in the main connection step, the joining surface of the rear end portion of the preceding tubular body and the front end portion of the succeeding tubular body are provided. The joining surfaces are joined by full penetration welding from the inside of the preceding pipe body and the succeeding pipe body.

  According to the first to sixth inventions, excavation by an excavator at a location adjacent to the temporarily connected connecting pipe after the preceding pipe and the succeeding pipe are propelled into the ground while being temporarily connected. Since the connection pipe temporarily connected in the state of being buried in the ground after the start of the main connection, in parallel with the excavation work in the location adjacent to the temporarily connected connection pipe, It is possible to carry out welding work at a place where the succeeding pipe body is temporarily connected, and the propulsion work of the preceding pipe and the succeeding pipe body is not interrupted due to the welding work. It can be significantly shortened.

  According to 1st invention-6th invention, even if it joins a preceding pipe body and a succeeding pipe body with a connection member, and is temporarily connected, in a propulsion stage, it is enough for the tensile force or the compressive force of a propulsion direction. In addition, after the completion of propulsion, the leading pipe and the trailing pipe are joined together by welding to complete the embedment, thereby sufficiently resisting the bending force. Since the amount of deformation in the height direction due to bending at the place where the preceding tube and the succeeding tube are connected to each other is equivalent to the amount of deformation of the tube itself, It is possible to prevent the ground road from sinking or the like.

  In particular, according to the second invention and the third invention, the front-side joint portion is provided away from the joint surface of the rear end portion of the preceding tube in the propulsion direction, and the joint surface of the front end portion of the succeeding tube body. Since the rear side joint portion is provided so as to be separated in the propulsion direction, a space for welding work can be secured between the front side joint portion and the rear side joint portion. It becomes possible to carry out.

  In particular, according to the second and third inventions, each of the leading tube and the trailing tube is formed in a substantially straight shape in the propulsion direction, and each of the leading tube and the trailing tube has a cross-sectional shape. By not changing in the propulsion direction, it becomes possible to avoid stress concentration due to changes in the cross-sectional shape, and it is possible to prevent breakage, deformation, etc. due to external force of the leading and trailing pipes Become.

It is a perspective view which shows the horizontal shaft where the pipe roof construction method to which this invention is applied is used. It is a side view which shows the horizontal shaft where the pipe roof construction method to which this invention is applied is used. It is a front view which shows the horizontal shaft where the pipe roof construction method to which this invention is applied is used. It is a side view which shows the pipe body connection structure used with the pipe roof construction method to which this invention is applied. It is a front view which shows the pipe connection structure used with the pipe roof construction method to which this invention is applied. It is an expanded side view which shows the pipe connection structure used with the pipe roof construction method to which this invention is applied. It is an enlarged front view which shows the pipe body connection structure used with the pipe roof construction method to which this invention is applied. It is a side view which shows the propulsion machine and excavator which were installed in the vertical shaft by the pipe roof construction method to which this invention is applied. It is a side view which shows the rear-end part of the 1st pipe body exposed from underground with the pipe roof construction method to which this invention is applied. It is an expanded side view which shows the front-end part of the succeeding pipe body inserted by the backing material of the rear-end part of a preceding pipe body at the temporary connection process of the pipe roof construction method to which this invention is applied. It is an expanded side view which shows the rear-end part of the preceding pipe body and the front-end part of a succeeding pipe body which are joined by the connection member at the temporary connection process of the pipe roof construction method to which this invention is applied, and is in the middle of temporary connection. It is a side view which shows the 1st pipe body and the 2nd pipe body propelled in the ground by the pipe roof construction method to which this invention is applied. It is a side view which shows the rear-end part of the 2nd tubular body exposed from underground with the pipe roof construction method to which this invention is applied. It is a side view which shows the 1st pipe body, the 2nd pipe body, and the 3rd pipe body which were embed | buried in the ground by the pipe roof construction method to which this invention is applied. It is a front view which shows the propulsion apparatus and excavator which were moved to the location adjoined to the connection pipe body temporarily connected by the pipe roof construction method to which this invention is applied. It is a side view which shows the worker who enters the inside of the connection pipe body temporarily connected by the pipe roof construction method to which this invention is applied, and starts welding work. It is an expanded side view which shows the rear-end part of the preceding pipe | tube joined by the full penetration welding in the main connection process of the pipe roof construction method to which this invention is applied, and the front-end part of a succeeding pipe body. (A) is a front view showing a preceding pipe and a succeeding pipe that are welded while sequentially removing a plurality of connecting members in the main connecting step of the pipe roof construction method to which the present invention is applied, and (b) It is a left side view. (A) is a front view showing a preceding pipe and a succeeding pipe that are welded in advance through the gaps of a plurality of connecting members in the main connecting step of the pipe roof construction method to which the present invention is applied, and (b) FIG. 5 is a side view showing a state where the connecting member is removed. It is an expanded side view which shows the connection member attached to the inner surface of a preceding pipe body or a succeeding pipe body with a pipe body connection structure used by the pipe roof construction method to which the present invention is applied, and attached to a front side joint part or a rear side joint part. is there. FIG. 5 is an enlarged side view showing a connecting member such as a bolt extending in a substantially rod shape and a spacer, which are continuously installed from a front side joining portion to a rear side joining portion in a pipe connecting structure used in a pipe roof construction method to which the present invention is applied. is there. (A) is a front view which shows the earth pressure which acts in the temporary connection process of the pipe roof construction method to which this invention is applied, (b) is a front view which shows the earth pressure which acts in this connection process. (A) is a side view which shows the tensile force or compressive force which acts at the temporary connection process of the pipe roof construction method to which this invention is applied, (b) is the soil below a connection pipe body after this connection process. It is a side view which shows the bending force which acts when excavating.

  Hereinafter, an embodiment for carrying out a pipe roof construction method to which the present invention is applied will be described in detail with reference to the drawings.

  The pipe roof construction method to which the present invention is applied is used to construct a horizontal shaft 8 such as a tunnel as shown in FIG. The pipe roof construction method to which the present invention is applied is used to embed a plurality of tubular bodies 7 such as steel pipes in the underground 80 by propelling them in a lateral propulsion direction X.

  The horizontal shaft 8 has a plurality of pipes 7 embedded in the ground 80, and a plurality of pipes 7 are used as earth retaining to prevent the collapse of the ground. By excavating the middle 80, an opening 8a serving as an entrance / exit of the horizontal shaft 8 is formed, and is constructed in the underground 80.

  The horizontal shaft 8 has, for example, a water pipe 81 and the like buried in a shallow layer of the underground 80 in the vicinity of the plurality of tubular bodies 7 above the plurality of tubular bodies 7 in the height direction Y. A road 82 or the like is laid on the ground surface in the vicinity of the water pipe 81 or the like above the water pipe 81 or the like buried in a shallow layer.

  As shown in FIG. 2, the pipe roof construction method to which the present invention is applied is configured such that the extension direction in which the horizontal shaft 8 is constructed is the lateral direction, and the plurality of tubular bodies 7 are sequentially propelled laterally from the side. Buried in In the pipe roof construction method to which the present invention is applied, the direction in which each pipe body 7 is propelled is the propulsion direction X, and a connecting pipe body 70 in which a plurality of pipe bodies 7 are connected to each other in the propulsion direction X is embedded in the underground 80. Will be.

  In the pipe roof construction method to which the present invention is applied, as shown in FIG. 3, a plurality of connecting pipes 70 are arranged above the opening 8 a to be formed in the horizontal shaft 8 along the opening 8 a of the horizontal shaft 8. It is buried in the underground 80 side by side in the direction Z. In the pipe roof construction method to which the present invention is applied, the plurality of connecting pipes 70 are connected to each other at the junction 75 so that the plurality of connecting pipes 70 are provided adjacent to each other in the width direction Z.

  In the pipe roof construction method to which the present invention is applied, when the opening 8a of the horizontal shaft 8 is formed in a substantially rectangular shape, the plurality of connecting pipe bodies 70 are arranged in a substantially straight line in the width direction Z. The pipe roof construction method to which the present invention is applied is not limited to this, and when the opening 8a of the horizontal shaft 8 is formed in a substantially semicircular shape or the like, the plurality of connecting pipe bodies 70 are substantially arched in the width direction Z. May be arranged.

  As shown in FIG. 4, the pipe connection structure 1 used in the pipe roof construction method to which the present invention is applied is for propelling and embedding a pipe body 7 such as a plurality of steel pipes in the lateral direction. A leading tube 2 embedded on the front side of X, and a trailing tube 3 connected to the preceding tube 2 and embedded on the rear side in the propulsion direction X.

  For example, a steel pipe having a substantially circular cross section, an inner diameter of about 800 mm to 1500 mm, an extension in the propulsion direction X of about 3 m to 6 m, and a plate thickness of about 8 mm to 20 mm is used for the preceding pipe body 2. The preceding tubular body 2 is provided with a plurality of front-side joints 4 projecting inward A from the inner surface of the preceding tubular body 2 at the rear end portion 2a of the propulsion direction X.

  For example, a steel pipe having an inner diameter of about 800 mm to 1500 mm, an extension in the propulsion direction X of about 3 m to 6 m, and a plate thickness of about 8 mm to 20 mm is used as the trailing tube 3. The trailing tube 3 is provided with a plurality of rear side joints 5 projecting inward A from the inner surface of the trailing tube 3 at the front end 3 a in the propulsion direction X.

  The leading tubular body 2 and the trailing tubular body 3 each include a plurality of front side joint portions 4 provided at the rear end portion 2a of the leading tubular body 2 and a plurality of front end portions 3a provided on the trailing tubular body 3. Are joined to each other in the propulsion direction X by being joined to each of the plurality of connecting members 6 extending in the propulsion direction X.

  The leading tube 2 and the trailing tube 3 are configured so that the inner diameter of the rear end portion 2a of the leading tube 2 and the inner diameter of the front end portion 3a of the trailing tube 3 are substantially the same. The joint surface 20 of the end portion 2a and the joint surface 30 of the front end portion 3a of the succeeding pipe body 3 are connected to each other in the propulsion direction X by joining by welding.

  The leading tubular body 2 and the trailing tubular body 3 are configured so that the joining surface 20 of the trailing end 2a of the leading tubular body 2 and the joining surface 30 of the leading end 3a of the trailing tubular body 3 face each other in the propulsion direction X. As shown in FIG. 5, each of the front side joint portions 4 and each rear side joint portion 5 is about eight places in the pipe circumferential direction W of the preceding tubular body 2 and the succeeding tubular body 3. Are substantially evenly distributed and arranged at substantially the same position.

  For example, a steel material or the like formed in a substantially rectangular shape is used for the front side joining portion 4. As shown in FIG. 6, the front side joint portion 4 has a predetermined extension in the propulsion direction X, and is provided away from the joint surface 20 of the rear end portion 2 a of the preceding tubular body 2 in the propulsion direction X. It is done.

  One end surface of the front side joint portion 4 in the height direction Y is attached to the inner surface of the preceding tubular body 2 by welding or the like. In the front side joint portion 4, a plurality of bolt insertion holes 40 penetrating in the plate thickness direction are formed at, for example, four locations with a predetermined interval in the propulsion direction X.

  For example, a steel material or the like formed in a substantially rectangular shape is used for the rear side joining portion 5. The rear side joint portion 5 has a predetermined extension in the propulsion direction X, and is provided away from the joint surface 30 of the front end portion 3a of the trailing tube 3 in the propulsion direction X.

  As for the back side junction part 5, the one end surface of the height direction Y is attached to the inner surface of the succeeding pipe body 3 by welding. In the rear side joining portion 5, a plurality of bolt insertion holes 50 penetrating in the plate thickness direction are formed at, for example, four places with a predetermined interval in the propulsion direction X.

  The connecting member 6 is made of, for example, a steel material formed in a substantially rectangular shape. As shown in FIG. 5, the connecting member 6 has about eight locations in the pipe circumferential direction W of the leading tube 2 and the trailing tube 3. The front side joint 4 and the rear side joint 5 are provided at positions where they are arranged. As shown in FIG. 6, the connecting member 6 has a predetermined extension in the propulsion direction X continuously from the front side joint 4 to the rear side joint 5.

  In the connecting member 6, a plurality of bolt insertion holes 60 penetrating in the plate thickness direction are formed at predetermined intervals in the propulsion direction X. In the connecting member 6, for example, the bolt insertion holes 60 are formed at four positions on the front side in the propulsion direction X, and the bolt insertion holes 60 are formed at four positions on the rear side in the propulsion direction X.

  The connecting member 6 is in a state where the joint surface 20 of the rear end portion 2a of the preceding tubular body 2 and the joint surface 30 of the front end portion 3a of the succeeding tubular body 3 face each other in the propulsion direction X. From the front side joint 4 to the rear side joint 5, a connecting member 6 formed in a substantially flat plate shape is continuously provided in the propulsion direction X.

  The connection member 6 includes a bolt insertion hole 60 of the connection member 6 and a bolt insertion hole 40 of the front side joint portion 4 that are disposed at substantially the same position. A fastening member 61 such as a bolt is continuously inserted up to the bolt insertion hole 40 of the joint portion 4.

  The connecting member 6 has a bolt insertion hole 60 of the connecting member 6 and a bolt insertion hole 50 of the rear side joint portion 5 arranged at substantially the same position. A fastening member 61 such as a bolt is continuously inserted to the bolt insertion hole 50 of the joint portion 5.

  As shown in FIG. 7, the connecting member 6 is formed in a substantially flat plate shape, and is connected to each of both surfaces of the front side joint portion 4 and the rear side joint portion 5 in the pipe circumferential direction W. Each of the pair of connecting members 6 abuts from both sides. The connecting member 6 is not limited to this, and even if one connecting member 6 is brought into contact with only one side in the pipe circumferential direction W of the front side joining portion 4 and the rear side joining portion 5 from one side in the pipe circumferential direction W. Good.

  The connecting member 6 is formed so that one side or both sides of the front side joining portion 4 and the rear side joining portion 5 are substantially flat, and each one side or both sides of the pair of connecting members 6 is substantially flat. The connecting member 6 is brought into surface contact with the front side joint portion 4 and the rear side joint portion 5 at the contact surface 6a. The connecting member 6 is inserted into the bolt insertion hole 40 of the front side joint portion 4, the bolt insertion hole 50 of the rear side joint portion 5, and the bolt insertion hole 60 of the connection member 6, and the nut 62 is fastened. Is done.

  The leading pipe body 2 and the trailing pipe body 3 are in contact with the front-side joint portion 4 and the rear-side joint portion 5 and the connecting member 6 at the contact surface 6 a, and are connected to the bolt insertion holes 60 of the connecting member 6. When the nut 62 is fastened to the inserted fastening member 61, the rear end portion 2 a of the preceding tubular body 2 and the front end portion 3 a of the trailing tubular body 3 are friction-bonded or supported by the plurality of connecting members 6. Join and temporarily connect.

  As shown in FIG. 6, a backing material 63 is attached to the leading tube 2 and the trailing tube 3 along the outer surface of the rear end portion 2 a of the leading tube 2. For example, the backing material 63 has a thickness of about 6 mm to 12 mm. The backing material 63 is arranged with a distal end portion 63a protruding from the joint surface 20 of the rear end portion 2a of the preceding tubular body 2 to the rear side in the propulsion direction X, and at the proximal end in the front side in the propulsion direction X. The part 63b is arranged.

  The backing material 63 straddles the joining surface 20 of the rear end 2a of the preceding tubular body 2 and the joining surface 30 of the front end 3a of the succeeding tubular body 3, and the outer surface of the rear end 2a of the preceding tubular body 2. Further, the base end portion 63b of the backing material 63 is joined in advance by welding or the like from the outer side B at a factory or the like, and the distal end portion 63a of the backing material 63 is attached to the outer surface of the front end portion 3a of the succeeding tube 3. However, it is joined by simple welding or the like from the outside B at a construction site or the like.

  The leading tube 2 and the trailing tube 3 are connected to the rear end portion 2a of the leading tube 2 by welding at the base end portion 63b of the backing material 63. Since the weld metal K is provided so as to surround the outer periphery of the end portion 2a, water from the gap between the base end portion 63b of the backing member 63 and the outer surface of the rear end portion 2a of the preceding pipe body 2 is weld metal K. Blocked.

  Since the leading end portion 63a of the backing material 63 is joined by welding along the outer surface of the front end portion 3a of the trailing tube 3, the leading end 2 and the trailing tube 3 are connected to the front end of the trailing tube 3. Since the weld metal K is provided so as to surround the outer periphery of the portion 3 a, water immersion from the gap between the front end portion 63 a of the backing material 63 and the outer surface of the front end portion 3 a of the succeeding pipe body 3 is blocked by the weld metal K. The

  The leading tubular body 2 and the trailing tubular body 3 are provided with a water-stopping material such as packing between the outer surface of the front end portion 3a of the trailing tubular body 3 and the inner surface of the backing material 63 as necessary. Thus, water immersion from the gap between the front end portion 63a of the backing member 63 and the outer surface of the front end portion 3a of the trailing tube 3 may be blocked by a water stop material such as packing.

  The leading tube 2 and the trailing tube 3 are formed with a front groove surface 4a inclined in the thickness direction from the inner side A of the leading tube 2 on the joint surface 20 of the trailing end 2a of the leading tube 2. In addition, a rear groove surface 5 a that is inclined in the thickness direction from the inner side A of the trailing tube 3 is formed on the joint surface 30 of the front end portion 3 a of the trailing tube 3. The leading tube 2 and the trailing tube 3 are formed by joining the bonding surface 20 of the trailing end 2a of the leading tube 2 and the bonding surface 30 of the leading end 3a of the trailing tube 3 by welding. As long as it can be connected, the front side groove surface 4a or the rear side groove surface 5a may be formed without being inclined.

  In the tube connection structure 1, the rear end portion 2 a of the preceding tube body 2 and the front end portion 3 a of the trailing tube body 3 are temporarily connected by joining with the connecting member 6. When the pipe connection structure 1 connects the leading pipe 2 and the trailing pipe 3 to each other, the joining surface 20 of the trailing end 2a of the leading pipe 2 and the front end 3a of the trailing pipe 3 are provided. The joint surface 30 is fully connected by welding.

  As shown in FIGS. 8 to 19, the pipe roof construction method to which the present invention is applied includes a preceding pipe body 2 embedded on the front side in the propulsion direction X and a trailing pipe body embedded on the rear side in the propulsion direction X. 3 is temporarily connected and propelled to the underground 80, and the main connecting step of temporarily connecting the preceding and second tubular bodies 2 and 3 temporarily embedded in the underground 80. With.

  In the pipe roof construction method to which the present invention is applied, the leading pipe body 2 and the trailing pipe body 3 are temporarily connected and propelled to the underground 80, and then are connected in a state where they are buried in the underground 80. One connecting pipe body 70 is embedded in the ground 80, and the plurality of connecting pipe bodies 70 are adjacent to each other in the width direction Z by repeatedly performing the temporary connection process and the main connection process. It will be buried in the underground 80.

  In the pipe roof construction method to which the present invention is applied, for example, when the first tubular body 71, the second tubular body 72, and the third tubular body 73 are connected to form one connected tubular body 70, the first tubular body 71 is used. A portion connecting the second tubular body 72 as the trailing tubular body 3, and a portion coupling the second tubular body 72 as the preceding tubular body 2 and the third tubular body 73 as the trailing tubular body 3. Is provided.

  In the pipe roof construction method to which the present invention is applied, first, as shown in FIG. 8, a shaft 83 is formed on each of the entrance side and the exit side of the horizontal shaft 8, and a propulsion device 84 such as a hydraulic jack, A first pipe 71 having an excavator 85 provided with a drill bit or the like at the tip in the direction X is installed in a vertical shaft 83 on the entrance side.

  Next, in the pipe roof construction method to which the present invention is applied, the first pipe body 71 in which the excavator 85 is installed is connected to the propulsion unit 84, and the underground 80 is excavated from the shaft 83 on the entrance side by the excavator 85. While pushing the excavator 85 in the lateral direction with the propulsion device 84, the first tubular body 71 in which the excavator 85 is housed is propelled to the ground 80 in the propulsion direction X to a predetermined distance.

  In the pipe roof construction method to which the present invention is applied, next, as shown in FIG. 9, after the first tube 71 is propelled to a predetermined distance, the first tube 71 is used as the preceding tube 2, for example, the preceding tube More than half of the extension of the pipe body 2 is embedded in the underground 80, and the rear end 2 a of the preceding pipe body 2 is exposed from the underground 80.

  In the temporary connection step, first, an extension of more than half of the preceding tubular body 2 is embedded in the underground 80 and a part of the preceding tubular body 2 is propelled into the underground 80, and then the rear end 2a of the preceding tubular body 2 is reached. The connection between the propulsion device 84 and the first tubular body 71 is released with the shaft 80 exposed from the ground 80.

  Next, in the temporary connecting step, the second tubular body 72 is used as the trailing tubular body 3, and the second tubular body 72 is installed between the propulsion device 84 and the first tubular body 71 to become the leading tubular body 2. The rear end portion 2a of the first tubular body 71 and the front end portion 3a of the second tubular body 72 serving as the trailing tubular body 3 are arranged to face each other in the propulsion direction X.

  In the temporary connection step, next, as shown in FIG. 10, by inserting the front end portion 3a of the succeeding tube body 3 into the backing material 63 provided at the rear end portion 2a of the preceding tube body 2, It is assumed that the joining surface 20 of the rear end portion 2a of the preceding tubular body 2 and the joining surface 30 of the front end portion 3a of the succeeding tubular body 3 face each other in the propulsion direction X.

  In the temporary connecting step, finally, as shown in FIG. 11, the connecting member 6 formed in a substantially flat plate shape is continuously laid in the propelling direction X from the front side connecting portion 4 to the rear side connecting portion 5. By providing, the rear end portion 2a of the preceding tubular body 2 and the front end portion 3a of the trailing tubular body 3 are joined and temporarily connected by the connecting member 6.

  At this time, in the temporary connection step, each of the plurality of connection members 6 is brought into surface contact with each of the plurality of front side joint portions 4 and the rear side joint portions 5, and the fastening member 61 is provided in the bolt insertion hole 60 of the connection member 6. Inserted and fastened to temporarily connect the rear end portion 2a of the preceding tubular body 2 and the front end portion 3a of the succeeding tubular body 3 by friction joining or supporting pressure joining with a plurality of connecting members 6 It becomes.

  Further, in the temporary connecting step, the front end portion 3a of the trailing tube 3 is inserted into the backing material 63 provided at the rear end portion 2a of the leading tube 2, and the front end portion 3a of the trailing tube 3 is inserted. By joining the tip 63a of the backing material 63 along the outer surface by simple welding, the weld metal K is provided so as to surround the outer periphery of the succeeding pipe body 3.

  In the pipe roof construction method to which the present invention is applied, next, as shown in FIG. 12, the second pipe 72 installed between the propulsion unit 84 and the first pipe 71 is connected to the propulsion unit 84, The 2nd pipe 72 is pushed in with the propulsion machine 84, and the 2nd pipe 72 is propelled to the underground 80 to a predetermined distance.

  As shown in FIG. 13, the pipe roof construction method to which the present invention is applied further uses the second pipe 72 as the leading pipe 2 and propels a part of the leading pipe 2 into the ground 80, and then the propulsion unit. By installing the third tubular body 73 between the second tubular body 84 and the second tubular body 72, the second tubular body 73 becomes the preceding tubular body 2 as shown in FIG. The rear end portion 2a of the tubular body 72 and the front end portion 3a of the second tubular body 72 serving as the trailing tubular body 3 are joined and temporarily connected by the connecting member 6.

  As shown in FIG. 14, the pipe roof construction method to which the present invention is applied is the first pipe 71, the second pipe 72, and the third pipe 73 that are temporarily connected and propelled to the ground 80. The tube body 71, the second tube body 72, and the third tube body 73 are installed in the ground 80 as one connection tube body 70 that is temporarily connected.

  Next, in the pipe roof construction method to which the present invention is applied, the excavator 85 is pulled out from the inside of the temporarily connected connecting pipe body 70, and the propulsion unit 84 and the excavator 85 are moved in the width direction Z as shown in FIG. The steps shown in FIG. 8 to FIG. 14 in order to install the next connecting pipe body 70 in the ground 80 at the place adjacent to the one connecting pipe body 70 temporarily connected in the width direction Z by moving. Is repeated.

  In the pipe roof construction method to which the present invention is applied, after the leading pipe body 2 and the trailing pipe body 3 are propelled to the underground 80 while being temporarily connected, they are finally connected and buried in the underground 80 at an arbitrary timing. Completed. In the pipe roof construction method to which the present invention is applied, for example, at a place adjacent to the temporarily connected connecting pipe body 70, after excavation by the excavator 85 is started, the temporarily connected connecting pipe body 70 is connected to the ground. The state embedded in the middle 80 is completed.

  In this connection process, as shown in FIG. 16, first, after the leading tube 2 and the trailing tube 3 are propelled to the ground 80 while being temporarily connected, the interior of the temporarily connected tube 70 is connected. At the place where the first pipe 71 and the second pipe 72 are temporarily connected and the place where the second pipe 72 and the third pipe 73 are temporarily connected. Start work.

  In this connection step, as shown in FIG. 17, next, the front side groove surface 4 a of the rear end portion 2 a of the preceding tubular body 2, and the rear side groove surface 5 a of the front end portion 3 a of the succeeding tubular body 3 Are made to face each other in the propulsion direction X, and a weld metal K is provided from the inner side A of the preceding pipe body 2 and the succeeding pipe body 3, and the joining surface 20 of the rear end portion 2a of the leading pipe body 2 and the following pipe The joint surface 30 of the front end portion 3a of the tubular body 3 is joined by full penetration welding. The leading tube 2 and the trailing tube 3 are formed by joining the bonding surface 20 of the trailing end 2a of the leading tube 2 and the bonding surface 30 of the leading end 3a of the trailing tube 3 by welding. As long as it can be connected, the front side groove surface 4a or the rear side groove surface 5a may be formed without being inclined.

  At this time, in this connection step, as shown in FIG. 18, a plurality of connections are made from the inner side A of the preceding tube 2 and the succeeding tube 3 in the pipe circumferential direction W of the preceding tube 2 and the following tube 3. While sequentially removing the members 6, the joining surface 20 of the rear end 2a of the preceding tube 2 and the joining surface 30 of the front end 3a of the succeeding tube 3 are sequentially joined by complete penetration welding.

  In the present connecting step, not limited to this, as shown in FIG. 19A, a plurality of connecting members 6 are attached to be separated from each other in the pipe circumferential direction W of the preceding tube 2 and the succeeding tube 3. A plurality of connecting members 6 may be removed after joining the leading tube 2 and the trailing tube 3 by welding in advance of the gap S1 formed in step S2.

  At this time, in this connection step, after the plurality of connection members 6 are removed, as shown in FIG. 19 (b), the front side joint 4 and the rear side joint 5 are formed apart from each other in the propulsion direction X. By connecting the locations where the respective connecting members 6 are attached by welding in the gap S2, the rear end portion 2a of the preceding tubular body 2 and the front end portion 3a of the trailing tubular body 3 are fully connected. Will be.

  In this connection step, a method of joining a plurality of connecting members 6 by welding while sequentially removing them, and a method of joining a plurality of connecting members 6 by welding ahead of a gap S1 formed by attaching them separately from each other. May be used in an appropriate combination, and if necessary, a plurality of connecting members 6 may be attached again after joining the preceding tube 2 and the succeeding tube 3 by welding.

  In the pipe roof construction method to which the present invention is applied, next, as shown in FIG. 1, all of the plurality of connection pipe bodies 70 temporarily connected through the temporary connection process and installed in the underground 80 are processed in the main connection process. Then, the main connection and the embedded state in the underground 80 are completed, and the inside of the plurality of connection pipe bodies 70 is filled and hardened as necessary.

  The pipe roof construction method to which the present invention is applied was finally laid on the ground surface, such as a water pipe 81 buried in a shallow layer, with a plurality of connecting pipe bodies 70 that have been fully connected and have been buried in the underground 80. By excavating the underground 80 by installing support structures below the plurality of connecting pipes 70 while preventing the collapse of the ground due to the road 82 and the like, and an overload such as earth pressure is applied, The horizontal shaft 8 will be constructed.

  At this time, after the tubular body connecting structure 1 propels a part of the preceding tubular body 2 to the ground 80, as shown in FIG. 9 and FIG. The front end portion 3a of the tube body 3 is temporarily connected by joining by the connecting member 6 extending in the propulsion direction X, and as shown in FIGS. 16 and 17, the leading tube body 2 and the trailing tube body 3 are After propulsion to the underground 80 with being temporarily connected, the rear end portion 2a of the preceding tubular body 2 and the front end portion 3a of the succeeding tubular body 3 are finally connected by joining by welding.

  Moreover, as shown in FIG. 20, the pipe connection structure 1 is provided with only one of the front side joint 4 and the rear side joint 5, and the front side joint 4 or the rear side joint 5 and The connection member 6 formed in a substantially flat plate shape may be temporarily connected by friction bonding or pressure bearing bonding.

  At this time, in the pipe roof construction method to which the present invention is applied, either the front side or the rear side of the connecting member 6 is attached to the inner surface of the preceding pipe body 2 or the succeeding pipe body 3 by welding or the like. 6 is attached to the front side joint portion 4 or the rear side joint portion 5 by the fastening member 61, so that the preceding tubular body 2 and the trailing tubular body 3 are temporarily connected. In addition, when the leading pipe 2 and the trailing pipe 3 are permanently connected by welding, the connecting member 6 is subjected to welding work by gas cutting or the like.

  Further, as shown in FIG. 21, the tube connecting structure 1 includes a connecting member 6 such as a bolt extending in a substantially rod shape in the propulsion direction X, continuously in the propulsion direction X from the front side joint 4 to the rear side joint 5. Then, it may be temporarily connected by joining with a connecting member 6 such as a bolt.

  At this time, the tube connection structure 1 is penetrated in the propulsion direction X to form the bolt insertion hole 40 in the front side joint portion 4, and is penetrated in the propulsion direction X to the bolt insertion hole 50 in the rear side joint portion 5. Is formed. In the tube connection structure 1, a substantially cylindrical spacer 64 extending in the propulsion direction X is provided between the front side joint 4 and the rear side joint 5 in the propulsion direction X.

  In the tube connection structure 1, the connection member 6 such as a bolt is inserted into the spacer 64, and both end portions 6 b of the connection member 6 are projected from both side ends of the spacer 64 in the propulsion direction X. In the tube connection structure 1, the nuts 62 are fastened by inserting the both end portions 6 b of the connecting member 6 into the bolt insertion holes 40 of the front side joint portion 4 and the bolt insertion holes 50 of the rear side joint portion 5.

  At this time, in the pipe roof construction method to which the present invention is applied, the both end portions 6b of the connecting member 6 are inserted into the bolt insertion holes 40 of the front side joint portion 4 and the bolt insertion holes 50 of the rear side joint portion 5, When the nut 62 is fastened, the leading pipe 2 and the trailing pipe 3 are temporarily connected, and when the leading pipe 2 and the trailing pipe 3 are connected by welding, a connection such as a bolt is used. The member 6 and the spacer 64 are removed and the welding operation is performed.

  As shown in FIG. 22, the pipe roof construction method to which the present invention is applied includes a propulsion stage for propelling the leading pipe 2 and the trailing pipe 3 to the ground 80, the leading pipe 2 and the trailing pipe 3 After the main connection is completed, the state of earth pressure E acting on the preceding pipe body 2 and the succeeding pipe body 3 is different after the completion of burying in which the underground pit 8 is provided by excavating the underground 80.

  In the propulsion stage, as shown in FIG. 22 (a), since there is earth and sand in the ground 80 around the preceding pipe body 2 and the succeeding pipe body 3, Thus, the earth pressure E acts substantially uniformly in the pipe circumferential direction W, and the external force in the height direction Y against the preceding pipe body 2 and the succeeding pipe body 3 is balanced.

  For this reason, in the propulsion stage, as shown in FIG. 23 (a), the tensile force in the propulsion direction X is mainly applied at the joint portion between the rear end 2a of the preceding tube 2 and the front end 3a of the succeeding tube 3. Since only the resistance against the force T or the compressive force P is required, even if the leading tube 2 and the trailing tube 3 are frictionally or pressure-bonded and temporarily connected by the connecting member 6, It can sufficiently resist the tensile force T or the compressive force P.

  On the other hand, after the completion of the embedding, as shown in FIG. 22 (b), the lower portion of the preceding pipe body 2 and the succeeding pipe body 3 buried in the underground 80 is excavated, so that the preceding pipe body 2 In addition, no soil is present below the trailing pipe 3, and earth pressure E acts on the leading pipe 2 and the trailing pipe 3 intensively only from above in the height direction Y.

  For this reason, after the completion of embedding, as shown in FIG. 23 (b), mainly in the height direction Y at the joint portion between the rear end 2a of the preceding tube 2 and the front end 3a of the succeeding tube 3. A predetermined bending force M acts from the upper side to the lower side of the pipe, but the leading pipe 2 and the trailing pipe 3 are joined together by welding to bend in the height direction Y. Can sufficiently resist the force M.

  As shown in FIG. 15, the pipe roof construction method to which the present invention is applied, as shown in FIG. 15, after propelling the preceding pipe body 2 and the succeeding pipe body 3 into the ground 80 while being temporarily connected, The excavator 85 and the excavator 85 are moved in the width direction Z and the excavator 85 starts excavation at a location adjacent to the temporarily connected connecting tube 70, and then the temporarily connected connecting tube 70 is grounded. The main connection is made while being buried in the middle 80.

  As a result, the pipe roof construction method to which the present invention is applied is performed in parallel with the excavation work at the location adjacent to the temporarily connected connecting pipe 70, as shown in FIG. Since the welding work can be carried out at a place where the pipe roof 3 is temporarily connected, the propulsion work of the preceding pipe body 2 and the succeeding pipe body 3 is not interrupted due to the welding work. It can be significantly shortened.

  On the other hand, in the conventional pipe roof construction method, after the preceding steel pipe to be embedded in advance is propelled to a predetermined distance, the propulsion of the preceding steel pipe by the propulsion jack is stopped and the time of 5 hours to 6 hours or more is stopped. Therefore, it is necessary to weld the preceding steel pipe and the following steel pipe, and the propulsion work of the preceding steel pipe and the following steel pipe is interrupted for 5 to 6 hours or more for each welding work. Is difficult to shorten.

  In addition, the conventional pipe roof construction method uses a bolt joint to connect the preceding steel pipe and the following steel pipe in order to shorten the construction period of the pipe roof construction method. A large clearance is required, and it is necessary to secure a gap for inserting the bolt into the hole through which the bolt is inserted. Therefore, the preceding steel pipe and the succeeding steel pipe are It becomes easy to bend. Therefore, after the connection steel pipe is installed, the lower part of the connection steel pipe is excavated, and when a soil load or an overlying load is applied to the connection steel pipe, the pipe body is bent, and the water pipe 81 or the like is deformed above the height direction Y. If the amount exceeds the allowable value, the water pipe 81 may be damaged, or the ground road 82 may be depressed.

  On the other hand, as shown in FIG. 23, the pipe roof construction method to which the present invention is applied is a propulsion method in which the leading pipe body 2 and the trailing pipe body 3 are joined by the connecting member 6 and temporarily connected. In the stage, the tensile force T or the compressive force P in the propulsion direction X can be sufficiently resisted, and after the completion of the embedment, the leading tube 2 and the trailing tube 3 are joined by welding. Therefore, the bending force M in the height direction Y can be sufficiently resisted.

  As a result, the pipe roof construction method to which the present invention is applied, as shown in FIGS. 1 and 23, is a deformation amount in the height direction Y due to bending at a position where the leading pipe body 2 and the trailing pipe body 3 are finally connected. However, it becomes equivalent to the deformation amount of the pipe body 7 itself, suppresses an increase in the deformation amount of the underground buried object such as the water pipe 81 above the height direction Y, and the road 82 on the ground surface sinks. This can be prevented.

  As shown in FIGS. 9 and 10, the pipe roof construction method to which the present invention is applied is such that the front end portion 3 a of the succeeding pipe body 3 is disposed inside the backing material 63 provided at the rear end part 2 a of the preceding pipe body 2. Inserted. Thereby, in the pipe roof construction method to which the present invention is applied, in the stage before joining the front end portion 3a of the succeeding tube body 3 to the rear end portion 2a of the preceding tube body 2, the rear end portion 2a of the preceding tube body 2 is Even if earth and sand fall on the rear end portion 2a of the preceding tubular body 2 while being exposed from the ground 80, only the sand particles fall on the outer side B of the backing material 63, and the front end portion of the succeeding tubular body 3 Since it is possible to prevent sand particles and the like from entering between the 3a and the backing material 63, it is possible to smoothly perform the joining operation of the leading tube 2 and the trailing tube 3.

  In the pipe roof construction method to which the present invention is applied, as shown in FIG. 11, water immersion from the gap between the front end portion 63 a of the backing material 63 and the outer surface of the front end portion 3 a of the succeeding pipe body 3 is blocked by the weld metal K. In addition, water immersion from the gap between the base end portion 63b of the backing material 63 and the outer surface of the rear end portion 2a of the preceding tubular body 2 is also blocked by the weld metal K. Thereby, in the pipe roof construction method to which the present invention is applied, the water intrusion into the leading pipe 2 and the trailing pipe 3 is blocked by the weld metal K, and the leading pipe 2 or the trailing pipe 3 It becomes possible to perform the welding work in the main connection process from the inner side A safely and reliably.

  In the pipe roof construction method to which the present invention is applied, as shown in FIG. 11 and FIG. 17, the front side joint portion 4 is provided away from the joint surface 20 of the rear end portion 2a of the preceding tubular body 2 in the propulsion direction X. At the same time, since the rear side joint portion 5 is provided away from the joint surface 30 of the front end portion 3a of the trailing tube 3 in the propulsion direction X, welding is performed between the front side joint portion 4 and the rear side joint portion 5. The work space can be secured, and the welding work can be carried out reliably and quickly.

  As shown in FIG. 23, the pipe roof construction method to which the present invention is applied connects the leading pipe 2 and the trailing pipe 3 to each other by welding the leading pipe 2 and the trailing pipe 3 by welding. The amount of deformation in the height direction Y due to bending at the connected portion is equivalent to the amount of deformation of the tube body 7 itself, and is necessary after joining the preceding tube body 2 and the succeeding tube body 3 by welding. Accordingly, by reattaching the plurality of connecting members 6, it is possible to improve the joint strength at the joint portion between the preceding tubular body 2 and the succeeding tubular body 3.

  In the pipe roof construction method to which the present invention is applied, each of the leading tube 2 and the trailing tube 3 is formed in a substantially straight shape in the propulsion direction X, and the respective cross sections of the leading tube 2 and the trailing tube 3. Since the shape does not change in the propulsion direction X, stress concentration due to changes in the cross-sectional shape can be avoided, and damage, deformation, etc. due to external force of the leading tube 2 and the trailing tube 3 can be prevented. It becomes possible to do.

  As mentioned above, although the example of embodiment of this invention was demonstrated in detail, all the embodiment mentioned above showed only the example of actualization in implementing this invention, and these are the technical aspects of this invention. The range should not be construed as limiting.

DESCRIPTION OF SYMBOLS 1: Tube connection structure 2: Leading pipe body 2a: Rear end part 20: Joining surface 3: Subsequent pipe body 3a: Front end part 30: Joining surface 4: Front side junction part 4a: Front side groove surface 40: Bolt Insertion hole 5: Back side joint 5a: Back side groove surface 50: Bolt insertion hole 6: Connection member 6a: Contact surface 6b: Both ends 60: Bolt insertion hole 61: Fastening member 62: Nut 63: Backing material 63a: distal end portion 63b: base end portion 64: spacer 7: tube body 70: connecting tube body 71: first tube body 72: second tube body 73: third tube body 75: junction 8: horizontal shaft 8a: opening Part 80: underground 81: water pipe 82: road 83: shaft 84: propulsion machine 85: excavator W: pipe circumferential direction X: propulsion direction Y: height direction Z: width direction

Claims (6)

A pipe roof construction method for embedding a plurality of tubular bodies by propelling them laterally,
A temporary connecting step of temporarily connecting a preceding pipe buried in the front side in the propulsion direction and a succeeding pipe buried in the rear side in the propulsion direction to propel them underground; A main coupling step of coupling the pipe body and the succeeding pipe body in a state of being buried in the ground,
In the temporary connection step, after a part of the preceding tubular body is propelled into the ground, the rear end portion of the preceding tubular body and the front end portion of the succeeding tubular body are connected with a connecting member extending in the propulsion direction. Join and temporarily connect,
In the main connection step, after the preceding tube and the trailing tube are propelled into the ground while being temporarily connected, a rear end portion of the preceding tube, and a front end portion of the following tube The pipe roof construction method is characterized in that these are joined together by welding. In the temporary connection step, the front surface projecting inward from the inner surface of the preceding tubular body with the joining surface of the rear end portion of the preceding tubular body and the joining surface of the front end portion of the succeeding tubular body facing each other. By laying and providing the connecting member from the side joint portion to the rear side joint portion protruding inward from the inner surface of the succeeding tube body, the rear end portion of the preceding tube body and the following tube body The pipe roof construction method according to claim 1, wherein the front end portion is temporarily connected. In the temporary connection step, the front surface projecting inward from the inner surface of the preceding tubular body with the joining surface of the rear end portion of the preceding tubular body and the joining surface of the front end portion of the succeeding tubular body facing each other. The rear end of the preceding tubular body is provided by laying a plurality of the connecting members formed in a substantially flat plate shape from the side joining portion to the rear side joining portion protruding inward from the inner surface of the succeeding tubular body. 3. The pipe roof construction method according to claim 1, wherein the portion and the front end portion of the succeeding pipe body are temporarily connected by friction bonding or supporting pressure bonding with the plurality of connecting members. In the main connection step, the joining surface of the rear end portion of the preceding tubular body and the joining surface of the front end portion of the succeeding tubular body in the circumferential direction of the preceding tubular body and the succeeding tubular body, The rear end portion of the preceding tubular body and the front end portion of the succeeding tubular body are fully connected by welding together while removing the connecting member from the inside of the preceding tubular body and the subsequent tubular body. The pipe roof construction method according to any one of claims 1 to 3, wherein: In the main connecting step, in the pipe circumferential direction of the preceding tubular body and the succeeding tubular body, a plurality of the connecting members are preceded by a gap formed by being attached to each other, and the leading tubular body While joining the joining surface of a rear-end part and the joining surface of the front-end part of the said succeeding pipe body by welding, after removing the said several connection member, the location where each said connection member was attached The pipe according to any one of claims 1 to 4, wherein the rear end portion of the preceding tubular body and the front end portion of the succeeding tubular body are permanently connected by welding. Roof construction method. In the main connection step, the joining surface of the rear end portion of the preceding tubular body and the joining surface of the front end portion of the succeeding tubular body are completely penetrated from the inside of the preceding tubular body and the succeeding tubular body. The pipe roof construction method according to any one of claims 1 to 5, wherein the pipe roof construction method is performed by joining by welding.

Images