JP2010229779A - Method for dismantling box-shaped roof pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dismantlement method which enables easy dismantlement of a unit box-shaped roof pipe pushed out into an arrival shaft, by enabling smooth dismantlement of the unit box-shaped roof pipe of a crosswise roof row. <P>SOLUTION: The plurality of box-shaped roof pipes 11 form the crosswise roof row 14 which is arranged in such a manner as to correspond to a ceiling of a caisson structure, and a pair of lengthwise roof rows 15 which are arranged in such a manner as to correspond to a side wall of the caisson structure. In a joint structure 10, a joint portion 16 between the pair of corner box-shaped roof pipes 11a, which is arranged in joint corners between the crosswise roof row 14 and the lengthwise roof rows 15 on both sides, and the lower box-shaped roof pipe 11b, which adjoins the corner box-shaped roof pipes 11a below them, can be vertically separated. The method for dismantling the box-shaped roof pipe includes a step of integrally hoisting the unit box-shaped roof pipes 12 of the crosswise roof row 14 upward together with the corner unit box-shaped roof pipes 12a on both sides, when removing the unit box-shaped roof pipe 12 pushed out into the arrival shaft 13. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a method for dismantling and removing a box-shaped roof pipe, and more particularly to a method for dismantling and removing a box-shaped roof pipe for removing a unit box-shaped roof pipe pushed out from a reaching shaft in the box-shaped roof construction method. .

  For example, a box-shaped roof construction method is known as a method of constructing a box structure in the ground while maintaining the state of use of these railroads and roads by crossing the railroad rails and roads below ( For example, see Patent Document 1 and Patent Document 2). The box-shaped roof construction method includes a plurality of box-shaped roof pipes having a rectangular cross section in the lateral direction and at positions corresponding to the ceiling portion and the side wall portions on both sides along the outer peripheral shape of the box structure to be installed. It is installed in the ground as a horizontal roof row and a vertical roof row continuously in the vertical direction, and the edge of the edge cutting plate placed on the upper surface of the horizontal roof row or the side surface of the vertical roof row is fixed. In this state, the end face of the ready-made box structure is brought into contact with the vertical roof row and the horizontal roof row, and the ground inside these roof rows is removed through the hollow interior of the box structure. While the box structure is moved forward, the box structure is replaced with a roof row of box-shaped roof pipes and installed in the ground.

  In such a box roof construction method, the box roof pipe installed in advance in the ground is made to dig a plurality of unit box roof pipes from the starting shaft to the reaching shaft while sequentially connecting the unit box roof tubes from the rear in the axial direction. It has become. In addition, the box-shaped roof pipe installed in advance in the ground is pushed out to the reaching shaft as the box structure advances, and the extruded box-shaped roof tube passes through the reaching shaft for each unit box-shaped roof tube. Will be removed. Furthermore, H-shaped steel, groove-shaped steel, etc. are assembled in the reach shaft, and a roof cradle is provided. In particular, the box roof pipes in the horizontal roof row installed on the ceiling are pushed out to the reach shaft. The unit box-shaped roof pipe is received by the roof stand and then dismantled and removed.

  In the box-type roof construction method, the joint portions between the box-shaped roof tubes adjacent in the horizontal direction or the vertical direction are provided with a plurality of engaging pieces protruding from the side surface of one of the adjacent unit box-shaped roof tubes. And a plurality of engaging pieces projecting from the side surface of the other unit box-type roof pipe are engaged with each other and guided to the joint portion by such an engaging piece called a junction. Thus, a device is devised to prevent a pair of adjacent box-shaped roof pipes from being displaced relative to each other in the horizontal direction or the vertical direction during the excavation work.

Japanese Examined Patent Publication No. 4-32199 Japanese Patent Publication No. 7-35719

  However, when a joint portion by an engagement piece protruding from each side surface portion is provided between adjacent box roof tubes, the box roof tube particularly for the box roof tubes constituting the lateral roof row. When the unit box-type roof pipe is pushed out to the reach shaft and removed for each unit box-type roof pipe, the engagement piece of the joint part of the box-type roof pipe adjacent in the lateral direction gets in the way, and the unit box-type roof pipe is removed. It may be difficult.

  That is, the reaching shaft is formed in a size that is considerably larger than, for example, twice the length of the unit box-shaped roof pipe along the direction of excavation, and the unit box-shaped roof tube extruded to the reaching shaft is If the box-shaped roof pipes that are adjacent to each other in the lateral direction can be pulled forward one by one, the unit box roof is released after the engagement of the joints by the engagement pieces is released in the longitudinal direction. It is possible to lift the tube. However, for example, due to land acquisition and surrounding traffic, the vertical shaft cannot be formed in a free size, and the length along the excavation direction is longer than the length of the unit box roof pipe, for example. If the vertical shaft can only be formed with a size shorter than twice the length of the unit box roof pipe, the unit box roof pipes constituting the box roof pipe of the lateral roof row are arranged one by one. Furthermore, it is difficult to pull forward and release the engagement of the joint portion by the engagement piece in the longitudinal direction.

  For this reason, in the conventional box roof construction method, for example, when the vertical shaft is narrow, the engagement pieces of the joint portion are removed so as not to interfere with gas cutting or the like, and then the unit box roof of the lateral roof row The method of lifting the pipe without pulling it further forward was adopted, but the work of removing the engaging piece or the fitting piece removed when diverting and using the unit box-type roof pipe is reattached by welding or the like. A lot of work is required for the work.

  The present invention makes it possible to smoothly remove the unit box roof pipes constituting the box roof pipes of the lateral roof row from the reaching shaft, so that even if the reaching shaft is narrow, it does not require much labor. It is an object of the present invention to provide a method for dismantling and removing a box-shaped roof pipe that can easily dismantle and remove a unit box-shaped roof pipe pushed out to a shaft.

  The present invention installs a box-shaped roof pipe having a plurality of rectangular cross-sections along the outer peripheral shape of the box structure to be installed side by side from the starting vertical shaft to the reaching vertical shaft. Later, in the box-type roof construction method that is installed in the ground by excavating the box structure from the starting vertical shaft to the reaching vertical shaft, replacing the plurality of box-shaped roof pipes that have been installed, A method for dismantling and removing a box-shaped roof pipe for removing the unit box-shaped roof pipe from the reach shaft, wherein the plurality of box-shaped roof pipes are located at positions corresponding to the ceiling portion of the box structure. A horizontal roof row arranged and a pair of vertical roof rows arranged at positions corresponding to side walls on both sides of the box structure are formed. The vertical direction of the The joint portion between the pair of corner box roof pipes arranged at the joining corner portion with the row and the lower box roof pipe adjacent to the lower corner box roof pipe has a joint structure that can be separated in the vertical direction. A plurality of the unit box shapes that form the lateral roof rows together with the corner unit box roof tubes on both sides when removing the unit box roof tubes at the front end in the pushing direction sequentially pushed out to the reach shaft. The object has been achieved by providing a method for dismantling and removing a box-shaped roof tube that includes a step of lifting the roof tube as a unit.

  In the method for dismantling and removing the box-shaped roof tube of the present invention, the joint structure that can be separated in the vertical direction is perpendicular to the lower side surface portion of the corner box-shaped roof tube and the upper side surface portion of the lower-shaped box-shaped roof tube. It is preferable to be configured by engaging an engaging piece having a flat cross-sectional shape that protrudes and is fixed to the surface.

  Further, in the method for dismantling and removing the box-shaped roof pipe of the present invention, the joint structure that can be separated in the vertical direction is provided via a bolt member that is mounted from the inside of the corner box-shaped roof pipe or the lower box-shaped roof pipe. A plurality of unit box-type roof tubes that are formed by using engagement pieces that are detachably fastened to the side portions and that form the lateral roof rows together with the corner unit box-type roof tubes on both sides. It is preferable that the fastening of the engaging piece is released from the inside of the corner box-shaped roof tube or the lower box-shaped roof tube prior to lifting upward as a unit.

  According to the method for dismantling and removing a box-shaped roof pipe of the present invention, the unit box-shaped roof pipe constituting the box-shaped roof pipe of the lateral roof row can be smoothly removed from the reaching shaft, even when the reaching shaft is narrow. The unit box roof pipe pushed out to the reaching shaft can be easily dismantled and removed without much labor.

It is sectional drawing explaining the box-shaped roof construction method by which the dismantling removal method of the box-shaped roof pipe which concerns on preferable one Embodiment of this invention is employ | adopted. It is a schematic perspective view explaining the dismantling removal method of the box-shaped roof pipe | tube which concerns on preferable one Embodiment of this invention. It is a principal part front view explaining the joint structure between a corner box-shaped roof pipe and a lower box-shaped roof pipe used in the method for dismantling and removing a box-shaped roof pipe according to a preferred embodiment of the present invention. (A) is a key to explain another joint structure between a corner box-shaped roof pipe and a lower box-shaped roof pipe used in the method for dismantling and removing a box-shaped roof pipe according to a preferred embodiment of the present invention. Part schematic sectional drawing, (b) is the A section enlarged view of (a).

  As shown in FIGS. 1 and 2, the method for dismantling and removing a box-shaped roof pipe according to a preferred embodiment of the present invention, for example, crosses the lower part of a rail 30 of a railway, for example, an underground structure for a road tunnel. Installation by replacing the hollow box structure 17 having a rectangular cross section to be formed with roof rows 14 and 15 by a plurality of box-shaped roof pipes 11 installed in advance in the ground below the railroad rail 30. It was adopted in the box-shaped roof construction method constructed in this way.

  Here, in the present embodiment, the box structure 17 has a blade edge member 31 attached to a tip portion thereof, and the lateral roof row 14 and the vertical roof are pressed while pressing the blade edge member 31 against the face surface. While excavating the inner ground 32 surrounded by the row 15, the box-shaped roof pipe 11 is pushed out toward the reaching shaft 13 while being pushed out toward the reaching shaft 13. Further, in the present embodiment, the box-shaped roof tube 11 pushed out to the reach shaft 13 is sequentially dismantled and removed from the unit box-shaped roof tube 12 at the tip in the extrusion direction X, and the box structure. The unit box-shaped roof pipes 12 of the lateral roof row 14 arranged along the ceiling portion 17a of the 17 are received by a roof support 33 provided in the reaching shaft 13 and then dismantled and removed.

  Furthermore, in this embodiment, the reach shaft 13 is a unit box having a length along the pushing direction X of, for example, about 3.0 to 6.0 m in relation to land acquisition, surrounding traffic, and the like. It is longer than the roof pipe 12 and shorter than twice the length of the unit box roof pipe 12, and even in such a small and narrow reaching shaft 13, the extruded unit box shape is formed. In order to enable the roof tube 12 to be efficiently and easily disassembled and removed without requiring much labor, the method for dismantling and removing the box-shaped roof tube of the present invention has been adopted. Yes.

  And the method of dismantling and removing the box-shaped roof pipe of this embodiment is a method for connecting the box-shaped roof pipe 11 having a plurality of rectangular cross sections along the outer peripheral shape of the box structure 17 to be installed (not shown). ) From the starting vertical shaft toward the vertical shaft 13 so as to replace the plurality of box-shaped roof pipes 11 installed. In the box roof construction method installed in the ground by excavating 17, a dismantling removal method for removing the unit box roof pipe 12 pushed out to the reaching shaft 13 from the reaching shaft 13, comprising a plurality of box shapes The roof tube 11 is disposed at a position corresponding to the lateral roof row 14 disposed at a position corresponding to the ceiling portion 17 a of the box structure 17 and side wall portions (not shown) on both sides of the box structure 17. A pair of A directional roof row 15 is formed, and a pair of corner box-shaped roof tubes 11a disposed at the joint corners of the lateral roof row 14 and the longitudinal roof rows 15 on both sides, and below The joint portion 16 between the lower box-shaped roof pipe 11b adjacent to the unit is a joint structure 10 that can be separated in the vertical direction, and the unit box-shaped roof at the tip in the pushing direction X that is sequentially pushed out to the reaching shaft 13 When the pipe 12 is removed, a plurality of unit box-shaped roof pipes 12 forming a lateral roof row 14 together with the corner unit box-shaped roof pipes 12a on both sides are integrally lifted upward.

  Further, in the method for dismantling and removing the box-shaped roof tube of the present embodiment, the joint structure 10 that can be separated in the vertical direction is, as shown in an enlarged view in FIG. Engage a pair of inner engagement pieces 18 and 18 with a flat cross-sectional shape and a pair of outer engagement pieces 19 and 19 with a flat cross-sectional shape fixed vertically projecting from the upper side surface of the box-shaped roof tube 11b. It is constituted by.

  In the present embodiment, as the unit box-shaped roof pipe 12 constituting the box-shaped roof pipe 11, a known rectangular pipe used for, for example, the R & C method (manufactured by Okumura Corporation) is preferably used. The unit box-shaped roof pipe 12 has a rectangular (square) cross-sectional shape of about 800 mm in length and width, for example, and a hollow portion in which an operator can enter and work.

  In addition, the unit box-shaped roof pipe 12 is provided with connecting ribs 26 having bolt fastening holes 25 formed at the four corners at both ends in the longitudinal direction. Through these connecting ribs 26, the box-shaped roof tube 11 can be advanced from the starting shaft to the reaching shaft 13 while sequentially connecting a plurality of unit box-shaped roof tubes 12 from the rear in the axial direction by connecting bolts. It is like that.

  Further, in the present embodiment, along the upper surface of the box-shaped roof tube 11 constituting the lateral roof row 14 and the outer surface of the box-shaped roof tube 11 constituting the longitudinal roof row 15, for example, the above-mentioned R & D. An edge cutting plate 27 (see FIG. 1) made of a known friction cut plate used for the sea construction method is provided. These edge cutting plates 27 are replaced with the roof rows 14 and 15 by connecting and pushing out the box structure 17 behind the roof rows 14 and 15 by the plurality of box-shaped roof pipes 11 installed in the ground. When the body structure 17 is installed in the ground, the roof rows 14 and 15 are cut from the surrounding ground, and the function as a guide surface that facilitates the sliding movement of the box structure 17 is exhibited. Become.

  In the present embodiment, a pair of corner box-shaped roof pipes 11a disposed at the joining corners of the horizontal roof row 14 and the vertical roof rows 15 on both sides, and a lower box-shaped roof adjacent below the pair of corner box-shaped roof tubes 11a. As described above, the joint structure 10 of the joint portion 16 between the pipe 11b and the lower side surface portion of the corner box-shaped roof tube 11a and the upper side surface portion of the lower box-shaped roof tube 11b are provided. The corner unit box-shaped roof pipe 12a and the lower unit box are configured by engaging a pair of inner engagement pieces 18, 18 having a flat cross-sectional shape and a pair of outer engagement pieces 19, 19 having a flat cross-sectional shape. The roof pipe 12b can be separated in the vertical direction.

  That is, in the present embodiment, the lower side surface portion of the corner unit box-shaped roof tube 12a that constitutes the corner box-shaped roof tube 11a that faces the lower box-shaped roof tube 11b has an inner portion on its outer portion and inner portion. As the engagement pieces 18, 18, a strip-shaped engagement piece having a flat cross-sectional shape protrudes vertically downward with respect to the lower side surface portion with a protruding height of, for example, 70 mm, and the corner unit box-shaped roof tube 12 a For example, they are attached over substantially the entire length by welding, for example.

  Further, on the upper side surface portion of the lower unit box-shaped roof tube 12b constituting the lower box-shaped roof tube 11b facing the corner box-shaped roof tube 11a, outer engagement pieces 19, 19 are provided on the outer and inner portions thereof. For example, a strip-shaped engagement piece having a flat cross-sectional shape protrudes vertically upward with respect to the upper side surface portion with a projection height of 70 mm, for example, and is welded over substantially the entire length of the lower unit box-shaped roof tube 11b. Each is attached by bonding.

  The joint structure of the joint portion 16 between the corner unit box-shaped roof pipe 12a and the lower unit box-shaped roof pipe 12b by the pair of inner engagement pieces 18, 18 and the pair of outer engagement pieces 19, 19. 10, the pair of inner engagement pieces 18, 18 are engaged with the inside of the pair of outer engagement pieces 19, 19. The relative displacement in the lateral direction can be effectively avoided, and the outer engagement pieces 19 and 19 and the inner engagement pieces 18 and 18 protrude vertically from the side portions. Since the flat cross-sectional shape is provided, the corner unit box-shaped roof pipe 12a and the lower unit box-shaped roof pipe 12b can be easily separated in the vertical direction.

  In this embodiment, in addition to the joint portion 16 between the corner box-shaped roof tube 11a and the lower box-shaped roof tube 11b, other box-shaped roof tubes 11 (unit box shape) adjacent in the horizontal direction or the vertical direction. Also in each joint portion 16 ′ between the roof pipes 12), a pair of inner engagement pieces 18, 18 having a flat cross-sectional shape and a flat cross-section, which are fixed vertically projecting from the side surface portions of the unit box-type roof pipe 12. A pair of outer engagement pieces 19, 19 having a shape are arranged and engaged with inner engagement pieces 18, 18 inside the outer engagement pieces 19, 19 to form a joint structure. Yes. As a result, the box-shaped roof tubes 11 (unit box-shaped roof tubes 12) constituting the horizontal roof row 14 and the vertical roof rows 15 on both sides are integrated, and each adjacent box-shaped roof tube 11 (unit box shape) is integrated. The roof tube 12) can prevent relative displacement in the horizontal and vertical directions during excavation work.

  And in this embodiment, when removing the unit box-shaped roof pipe 12 of the front-end | tip of the extrusion direction X pushed out to the reach shaft 13 sequentially, the horizontal direction roof row | line | column 14 is put together with the corner unit box-shaped roof pipes 12a on both sides. A step of lifting upward the unit box-shaped roof pipes 12 to be formed is included.

  That is, in the step of lifting the unit box roof pipes 12 forming the lateral roof row 14 together as one unit, as shown in FIG. A plurality of unit box-shaped roof tubes 12, 12a constituting a lateral roof row 14 including corner box-shaped roof tubes 11a on both sides are connected to the plurality of unit box-shaped roof tubes 12, A lifting bracket 20 made of a plate-like plate member is attached, and a plurality of unit box-shaped roof pipes 12 and 12a of the lateral roof row 14 are separated from the vertical roof row 15 through the lifting fitting 20 at the same time. It is designed to be lifted.

  Here, in the present embodiment, the lifting metal fitting 20 is formed by, for example, bending the both end portions of a metal band plate-like plate member vertically downward, thereby forming a horizontal attachment portion 20a and vertical attachment portions 20b on both sides. The vertical attachment portion 20b is provided so that the distance between the pair of vertical attachment portions 20b on both sides is equal to the width of the lateral roof row 14. It has been.

  In addition, bolt fastening holes are formed at appropriate positions in the horizontal attachment portion 20a and the vertical attachment portion 20b. These bolt fastening holes are preferably matched with the box-shaped roof side bolt fastening holes formed on the outer peripheral side surface of the unit box-shaped roof pipe 12 constituting the lateral roof row 14, and the bolt member 21 is fitted. By fastening, the unit box-shaped roof tubes 12, 12a constituting the lateral roof row 14 are joined to the lifting bracket 20, respectively, whereby the plurality of unit box-shaped roof tubes 12, 12a are joined to the lifting bracket. It can be lifted upwards as a single unit via 20. In the present embodiment, as the box-shaped roof side bolt fastening hole, a grout injection hole formed preferably on the outer peripheral side surface of the unit box-shaped roof pipe 12, 12a can be used as it is.

  Furthermore, in this embodiment, the lower end portion of the lifting wire 22 is connected to both end portions of the lifting bracket 20. A plurality of unit box-shaped roof pipes 12 and 12a of the lateral roof row 14 pushed out by the lifting heavy machinery such as a crawler crane and a wrecker through the lifting wire 22 and the lifting bracket 20 are vertically moved. With the joint structure 10 of the joint part 16 that can be separated into two parts, the corner unit box-shaped roof pipe 12a is separated from the lower unit box-shaped roof pipe 12b of the longitudinal roof row 15 and is smoothly lifted up as a unit to reach the reaching shaft 13 It can be easily removed from.

  In addition, after the plurality of unit box roof tubes 12 and 12a of the lateral roof row 14 are removed as a unit, the unit box roof tubes 12b and 12 constituting the remaining vertical roof row 15 are While smoothly releasing the engaged state of the joint part 16 left only on the side surface part, it is possible to disassemble and remove one after another easily by lifting up one by one.

  That is, according to the method for dismantling and removing the box-shaped roof tube of the present embodiment, the unit box-shaped roof tubes 12, 12a constituting the box-shaped roof tubes 11, 11a of the lateral roof row 14 are engaged with the joint portion 16. The unit box-type roof pipe 12 pushed out to the reaching shaft 13 is not required much trouble even if the reaching shaft 13 is narrow so that it can be smoothly removed from the reaching shaft 13 without removing the pieces 18 and 19. Can be easily dismantled and removed.

  4 (a) and 4 (b) show a corner box roof tube 11a (corner unit box roof tube 12a) and a lower box roof tube used in the method for dismantling and removing a box roof tube of this embodiment. The other joint structure 10 'which can be separated in the up-down direction in the joint part 16 between 11b (lower unit box-type roof pipes 12b) is illustrated.

  That is, the joint structure 10 ′ shown in FIGS. 4 (a) and 4 (b) is formed on the lower side surface portion of the corner box roof tube 11a via the bolt member 23 mounted from the inside of the corner box roof tube 11a. A plurality of unit boxes which are configured by using a pair of engaging pieces 24 having an L-shaped cross section, which are detachably fastened, and which form the lateral roof row 14 together with the corner unit box-shaped roof pipes 12a on both sides. Prior to lifting the roof pipe 12 as a unit, the engagement piece 24 is released from the inside of the square box roof pipe 11a.

  Here, in the joint structure 10 ′ shown in FIGS. 4 (a) and 4 (b), the pair of engaging pieces 24 projecting downward from the lower side surface portion of the corner box-shaped roof tube 11a are along the lower side surface portion. Are integrally joined and attached to the base plate 28 arranged in the same manner. A plurality of female screw holes 29 are formed in the base plate 28 at intervals in the longitudinal direction. A plurality of bolt fastening holes 34 penetratingly formed in the lower side surface portion of the corner unit box-shaped roof tube 12a at intervals in the longitudinal direction are matched with these female screw holes 29, respectively. By attaching and screwing bolt members 23 from the inside of the tube 12a, the pair of engaging pieces 24 are attached so as to protrude from the lower side surface portion of the corner unit box-shaped roof tube 12a into an L-shaped cross-sectional shape. become.

  Further, in the joint structure 10 ′ shown in FIGS. 4A and 4B, the lower box roof that forms the joint portion 16 together with the engagement piece 24 attached to the lower side surface portion of the corner box roof tube 11a. A pair of engagement pieces 35 provided so as to protrude from the upper side surface portion of the tube 11b is an engagement piece 35 having an L-shaped cross-sectional shape, which is integrally fixed to the upper side surface portion. Further, these engagement pieces 35 are engaged with the pair of L-shaped cross-section engagement pieces 24 of the corner unit box-shaped roof pipe 12a in the joint portion 16 so as to be hooked. Each piece is attached to a position adjacent to the inside of the piece 24.

  And even when the joint part 16 that can be separated in the vertical direction is formed by the joint structure 10 ′ shown in FIGS. 4A and 4B, the units constituting the box-shaped roof pipes 11, 11 a of the lateral roof row 14. The box-shaped roof tubes 12 and 12a can be lifted simultaneously as a single unit by releasing the fastening of the base plate 28 to which the engagement pieces 24 are joined by a simple operation from the inside of the corner-shaped box-shaped roof tube 11a. As a result, the unit box roof tubes 12 and 12a of the lateral roof row 14 and the unit box roof tubes 12b and 12 of the vertical roof row 15 can be easily and smoothly, as described above. It becomes possible to remove from the reaching shaft 13.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, the engaging pieces that are detachably fastened to the side surfaces using bolt members attached from the inside of the corner box roof pipe or the lower box roof pipe are integrally joined. It is not always necessary to be fastened via the base plate, and the engaging piece can be directly fastened to the side portion of the corner box-shaped roof tube or the lower box-shaped roof tube using a bolt member.

10, 10 'Joint structure 11 Box-shaped roof tube 11a Corner box-shaped roof tube 11b Lower box-shaped roof tube 12 Unit box-shaped roof tube 12a Corner unit box-shaped roof tube 12b Lower unit box-shaped roof tube 13 Reaching shaft 14 Horizontal Directional roof row 15 Longitudinal roof row 16 Joint portion 17 Box structure 18 Inner engagement piece 19 Outer engagement piece 20 Lifting bracket 20a Horizontal attachment portion 20b Vertical attachment portion 21 Bolt member 22 Lifting wire 23 Bolt member 24 Possible engagement piece 28 Base plate 29 Female screw hole 34 Bolt fastening hole 35 Engagement piece

Claims (3)

Along with the outer peripheral shape of the box structure to be installed, box-shaped roof pipes having a plurality of rectangular cross-sections are installed side by side by excavating from the starting shaft to the reaching shaft, and then installed. In the box-type roof construction method that is installed in the ground by excavating the box structure from the starting shaft to the reaching shaft by replacing with a plurality of box-shaped roof pipes, the unit box pushed out to the reaching shaft A method for dismantling and removing a box-shaped roof pipe for removing a shaped roof pipe from the reach shaft,
The plurality of box-shaped roof pipes are a pair of lateral roof rows disposed at positions corresponding to the ceiling portion of the box structure and positions corresponding to side wall portions on both sides of the box structure. And the vertical roof row of
There is a joint portion between a pair of corner box roof tubes disposed at a joint angle portion between the lateral roof row and the vertical roof rows on both sides, and a lower box roof tube adjacent below the pair of corner box roof tubes. The joint structure can be separated in the vertical direction.
A plurality of unit box roof pipes that form the lateral roof row together with the corner unit box roof pipes on both sides when removing the unit box roof pipes at the front ends in the pushing direction sequentially pushed out to the reach shaft. A method for dismantling and removing a box-shaped roof pipe, which includes a step of lifting upward as a unit. The joint structure that can be separated in the vertical direction includes an engagement piece having a flat cross-sectional shape that is vertically protruded and fixed from a lower side surface portion of the corner box roof tube and an upper side surface portion of the lower box roof tube. The method for dismantling and removing a box-shaped roof pipe according to claim 1, wherein the box-shaped roof pipe is disassembled. The joint structure that can be separated in the vertical direction is an engagement that is detachably fastened to these side portions via bolt members attached from the inside of the corner box roof tube or the lower box roof tube. Prior to lifting the unit box-shaped roof tubes together forming the lateral roof row together with the corner unit box-shaped roof tubes on both sides together as a unit, The method for dismantling and removing a box-shaped roof tube according to claim 1, wherein the fastening of the box-shaped roof tube is released from the inside of the corner box-shaped roof tube or the lower box-shaped roof tube.

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