JP5189019B2 - Box roof pipe joint structure - Google Patents

Description

  The present invention relates to a joint structure for box-shaped roof pipes, and in particular, in a box-type roof construction method, a joint between adjacent box-shaped roof pipes that facilitates dismantling and removal of unit box-type roof pipes pushed into a reach shaft. It is related with the joint structure of a part.

  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 is a method in which a plurality of box-shaped roof pipes having a rectangular cross section are arranged in a horizontal direction and a vertical direction along the outer peripheral shape of a box structure to be installed, preferably at a position corresponding to a ceiling part and a side wall part. The box structure is ready-made in a state where the edge of the edge cutting plate arranged on the upper surface of the horizontal roof row or the side surface of the vertical roof row is fixed to the stationary position. The box structure is advanced by abutting the end faces of the box structure on the vertical roof row and the horizontal roof row and removing the ground inside these roof rows through the hollow interior of the box structure. The body structure is replaced with a roof row of box-shaped roof tubes 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. In addition, H-shaped steel, groove-shaped steel, etc. are assembled in the reaching shaft, and a roof cradle is provided. Especially, the box-shaped roof pipe installed on the ceiling is a unit box shape pushed out to the reaching shaft. The roof tube is received by the roof cradle, 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

  On the other hand, if there is a joint with an engaging piece protruding from each side between adjacent box-shaped roof pipes, the box-shaped roof pipe is pushed out to the vertical shaft and removed for each unit box-shaped roof pipe In doing so, the engagement piece of the joint part may become an obstacle, making it difficult to remove the unit box-shaped roof pipe.

  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 it can be pulled out forward one by one so that adjacent box-shaped roof pipes can be moved inside, the engagement of the joint part by the engagement piece is released in the longitudinal direction, and then the unit box-shaped roof pipe is lifted Is possible. 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 length shorter than twice the length of the unit box-type roof pipe, pull out the unit box-type roof pipes one by one further forward, It is difficult to release the engagement in the longitudinal direction.

  For this reason, in the conventional box-type roof construction method, for example, when the reaching shaft is narrow, the engagement piece of the joint portion is removed so as not to get in the way by gas cutting or the like, and then the unit box-type roof pipe is further moved forward. Although a method of lifting without pulling out has been adopted, for example, when the unit box-shaped roof pipe is diverted and used, it is necessary to reattach the removed engagement piece by welding or the like, which requires much labor.

  In the inventions described in Patent Document 1 and Patent Document 2, the engagement piece is detachably bolted to the outer peripheral surface of the unit box-type roof tube (see Patent Document 1), or one unit box-type roof tube. The engagement piece is protruded flat (see Patent Document 2), and the engagement of the joint portion by the engagement piece between the adjacent unit box-type roof pipes can be released even when the reaching shaft is narrow. However, it is not easy to remove the joining bolts of the engagement pieces provided at the lower part of the unit box-type roof pipe. If the function of preventing the displacement of the tube cannot be sufficiently exhibited and the amount of protrusion is large, a large amount of labor is required for the operation of lifting the unit box-shaped roof tube while releasing the engagement.

  The present invention has been made to solve the technical problem peculiar to such a box roof construction method, and facilitates engagement of a joint portion by an engagement piece between adjacent unit box roof pipes. Providing a joint structure for box-shaped roof pipes that can be easily lifted and dismantled and removed without requiring much effort even when the vertical shaft is narrow. The purpose is to do.

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, it is used in a box roof construction method that is installed in the ground by excavating the box structure from the starting shaft to the reaching shaft, replacing the plurality of box roof tubes installed, A joint structure of a joint portion between adjacent box roof tubes that facilitates disassembly and removal of the unit box roof tube extruded into a plurality of units, and is arranged along the ceiling portion of the box structure A pair of joints between a lateral roof row composed of the box-shaped roof tubes and a pair of vertical roof rows composed of the plurality of box-shaped roof tubes arranged along the side wall portions on both sides of the box structure One of the corners The unit box roof pipes arranged at the corners are sequentially dismantled and removed, and the joint portion is provided with a plurality of protrusions provided on the side surface of one of the adjacent unit box roof pipes. It is configured by engaging an engagement piece with a plurality of engagement pieces provided to project from the side surface of the other unit box roof pipe, and is disposed at the one joint angle portion. In addition, the engagement piece provided on one side surface portion and the lower side surface portion of the unit box-shaped roof pipe has a female screw hole in the base portion, and is formed to penetrate these side surface portions. By screwing a bolt member fitted from the inside of the unit box-type roof pipe into the bolt fastening hole into the female screw hole, it is detachably fastened to one side surface portion and a lower side surface portion. and which, the unit box Katachiru that is disposed on one joint angle portion Engagement pieces provided on one side surface portion and the lower side surface portion of the pipe are made of a steel material having an L-shaped cross-sectional shape, and the female screw hole with one side portion of the L-shaped cross-sectional shape as the base portion. When the bolt member is screwed into the female screw hole, the other side portion is attached so as to protrude from the side surface portion into a flat cross-sectional shape, and is attached to the one joint angle portion. The engaging pieces provided on the side surface of the box-shaped roof tube adjacent to the side of the unit box-shaped roof tube and the side surface of the box-shaped roof tube adjacent to the lower side of the unit box-shaped roof tube are respectively provided on these side surfaces. The above-mentioned object is achieved by providing a joint structure of a box-shaped roof pipe which is an engagement piece having a flat cross-sectional shape integrally joined to a portion.

  According to the joint structure of the box-type roof pipe of the present invention, the engagement of the joint portion by the engagement piece between the adjacent unit box-type roof pipes can be easily released, and even when the reaching shaft is narrow, The work of lifting the unit box-type roof tube and dismantling it can be easily performed without the need for the above.

It is sectional drawing explaining the box-shaped roof construction method using the joint structure of the box-shaped roof pipe which concerns on preferable 1st Embodiment of this invention. In the box-shaped roof construction method using the joint structure of the box-shaped roof pipe concerning a 1st preferred embodiment of the present invention, it is a schematic sectional view explaining the situation where the unit box-shaped roof pipe pushed out to the reaching shaft is dismantled and removed. is there. It is a principal part front view explaining the structure of the joint structure of the box-shaped roof pipe which concerns on preferable 1st Embodiment of this invention. (A) is the A section expanded sectional view of Drawing 3, (b) is the C section expanded sectional view of (a). FIG. 4 is an enlarged cross-sectional view of a B part in FIG. 3. In the box roof method using the box roof joint structure according to the reference example , it is a schematic cross-sectional view for explaining the state of dismantling and removing the unit box roof pipe pushed out to the reach shaft. It is principal part schematic sectional drawing explaining the structure of the joint structure of the box-shaped roof pipe which concerns on a reference example . It is the D section expanded sectional view of FIG.

  As shown in FIGS. 1 and 2, a box roof pipe joint structure 10 according to a first preferred embodiment of the present invention traverses, for example, a railroad rail 30 below, for example, an underground structure for a road tunnel. The hollow box structure 17 having a rectangular cross section for forming the roof is replaced by the roof rows 14 and 15 formed by the box-shaped roof pipes 11 in the ground below the railroad rail 30. It was adopted in the box-shaped roof construction method constructed.

  Here, in the first embodiment, the box structure 17 has a blade edge member 31 attached to the tip portion thereof, and the inner side of the roof rows 14 and 15 while pressing the blade edge member 31 against the face surface. While excavating the ground 32, the box-shaped roof pipe 11 is pushed toward the reaching shaft 13 while being pushed out toward the reaching shaft 13. Further, in the first 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 on the front end side in the pushing direction X. The unit box-shaped roof pipe 12 disposed along the ceiling portion 17a of the body structure 17 is received by a roof cradle 33 provided in the reaching shaft 13, and then disassembled and removed.

  Furthermore, in the first embodiment, the reach shaft 13 has 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. The unit box-shaped roof pipe 12 is longer than the unit box-type roof pipe 12 and shorter than twice the length of the unit box-type roof pipe 12. As shown in FIG. 3, the box-shaped roof pipes 12 are successively and smoothly disassembled from the unit box-shaped roof pipes 12 a arranged at, for example, one joint angle portion of the horizontal roof line 14 and the vertical roof line 15. In order to be able to be removed, the joint structure 10 of the box-shaped roof pipe of the present invention is employed.

And the joint structure 10 of the box-shaped roof pipe of the first embodiment includes a 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) are installed side by side by excavating from the starting shaft to the reaching shaft 13 by excavating from the starting shaft to the reaching shaft 13. It is used in a box-shaped roof construction method that is installed in the ground by excavating the structure 17 and facilitates dismantling and removal of the unit box-shaped roof pipe 12 pushed out to the reach shaft 13, for example, a box shape located at a corner portion This is a joint structure of the joint portion 16 between the roof pipe 11a and the box-shaped roof pipes 11b and 11c adjacent thereto. A lateral roof row 14 composed of a plurality of box-shaped roof tubes 11 disposed along the ceiling portion 17 a of the box structure 17, and a plurality of boxes disposed along the side wall portions on both sides of the box structure 17. The unit box-shaped roof tube 12a disposed at one of the pair of joint angle portions with the pair of longitudinal roof rows 15 formed of the shape roof tube 11 is sequentially disassembled and removed. The joint portion 16 includes a plurality of (two in the first embodiment) engagement pieces 18 provided to protrude from the side surface portion 21a of one adjacent unit box-shaped roof tube 12a, and the other unit box-shaped roof tube. It is constituted by engaging a plurality of (two in the first embodiment) engagement pieces 19 provided protruding from the side surface portions 21b, 21c of 12b, 12c, and one joint angle portion Unit box type roof pipe 12 arranged in One side of the side surface portion 21a and the engagement piece 18 provided on the side surface 21a of the lower is provided with engaging pieces 18 on the side surface 21a of one of the unit box-shaped roof tube 12a, Fig. 4 ( As shown in FIGS. 5A and 5B and FIG. 5, the base portion 18a has a female screw hole 20, and the unit box-shaped roof tube 12a is inserted into a bolt fastening hole 22 formed through the side surface portion 21a. The bolt member 23 mounted from the inside is screwed into the female screw hole 20 so as to be detachably fastened to the side surface portion 21a.

Moreover, in the joint structure 10 of the box-shaped roof pipe of the first embodiment, it is provided on one side surface portion 21a and the lower side surface portion 21a of the unit box-shaped roof tube 12a disposed at one joint angle portion. As the engaging piece 18, an angle steel having an L-shaped cross section is used (see FIGS. 4A, 4B and 5). The engaging piece 18 is formed with a female screw hole 20 with one side portion of the L-shaped cross-sectional shape as a base portion 18a, and the bolt member 23 is screwed into the female screw hole 20 from the inside of the unit box-shaped roof tube 12a. Thus, one side (base) 18a is brought into close contact with the side part 21a, and the other side part 18b is attached in a state of protruding from the side part 21a into a flat cross-sectional shape.

  In the first embodiment, the unit box-shaped roof tube 12a that forms the box-shaped roof tube 11a located at one corner portion, and the unit box-shaped that forms the box-shaped roof tube 11b adjacent to the side thereof. The joint structure of the present invention is adopted only for the joint portion 16 between the roof pipe 12b and the unit box-type roof pipe 12c constituting the box roof pipe 11c adjacent to the lower side. As for the joint portion 16 ′ between the box-shaped roof pipes 11, a joint structure with engagement pieces 24 having a flat cross-sectional shape integrally joined to the side portions on both sides, for example, is employed, similar to the conventional joint portion. (See FIGS. 2 and 3).

  That is, in the first embodiment, the lateral roof row 14 composed of a plurality of box-shaped roof tubes 11 arranged along the ceiling portion 17 a of the box structure 17 and the side wall portions on both sides of the box structure 17. A pair of longitudinal roof rows 15 made up of a plurality of box-shaped roof tubes 11 arranged along the cross-sectional shape of the U-shaped cross section of the box-shaped roof tube 11a facing downward. Are connected to each other and are continuously integrated in the cross-sectional direction, and the box-shaped roof pipes 11 of these continuously integrated roof rows 14 and 15 are dug together as a unit. . Therefore, the unit box-shaped roof tube 12a of the box-shaped roof tube 11a arranged at the joint angle portion between the lateral roof row 14 and the vertical roof row 15 has a joint portion on the side surface portion 21a on the side and the lower side. Since 16 is provided, it is difficult to perform the operation of simultaneously releasing the engagement state of the two side surfaces 21a of the box-shaped roof pipe 11a at the joint corner portion.

  Further, the unit box-shaped roof tube 12a of the box-shaped roof tube 11a disposed at one joint angle portion of the horizontal roof column 14 and the vertical roof column 15, and the unit box adjacent to the unit box-shaped roof tube 12a in the horizontal and vertical directions. If the unit box-shaped roof pipe 12a can be disassembled and removed by releasing the engaged state with the shape-shaped roof pipes 12b, 12c, the remaining unit box-shaped roof pipe 12 has a joint portion left only on one side surface portion. It becomes possible to disassemble and remove easily one after another while releasing the engaged state by a slight movement of the unit box-shaped roof pipe 12. For this reason, in the first embodiment, the unit box-shaped roof tube 12a of the box-shaped roof tube 11a arranged at one joint angle portion, and the box-shaped roof tubes 11b, 11c adjacent to the side and the lower side of the unit-shaped roof tube 11b. The joint structure 10 of the present invention is adopted only for the joint portion 16 between the unit box-shaped roof pipes 12b and 12c to constitute the unit box-type roof pipe 12a disposed at one joint angle portion. While being able to perform quickly, about other joint part 16 ', the joint structure similar to the conventional joint part is employ | adopted.

  Here, in the first embodiment, as the unit box-shaped roof pipe 12 constituting the box-shaped roof pipe 11, for example, a known rectangular pipe used for the R & C method (manufactured by Okumura Corporation) is preferably used. Can do. 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 in which bolt fastening holes 25 are formed at the four corners at both ends in the longitudinal direction (see FIG. 3). 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 first embodiment, for example, the engagement pieces 18, 19, and 24 that protrude from the side surface portion 21 of the unit box-shaped roof tube 12 are connected to the adjacent box-shaped roof tube 11 in the horizontal direction or the vertical direction. The joint portions 16 and 16 'are formed by engaging each other so that the adjacent box-shaped roof pipe 11 does not cause a relative positional shift in the horizontal direction or the vertical direction during the excavation work. Can be done.

  Furthermore, in the first embodiment, for example, 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, as described above. An edge cutting plate 27 (see FIG. 1) made of a known friction cut plate used in the R & C method is provided. These edge-cutting plates 27 are replaced with the roof rows 14 and 15 by connecting the box structures 17 to the rear of the roof rows 14 and 15 by the box-shaped roof pipes 11 installed in the ground, and are extruded. When the object 17 is installed in the ground, the function of cutting the roof rows 14 and 15 from the surrounding ground and the function of a guide surface that facilitates the sliding movement of the box structure 17 are exhibited.

  And the joint structure 10 of the box-shaped roof pipe of this 1st Embodiment is the joint part between the box-shaped roof pipe 11a arrange | positioned at one corner | angular part, and the box-shaped roof pipes 11b and 11c adjacent to this. 3 and 5, as shown in FIGS. 3 to 5, one side surface portion 21a and a lower side surface of the unit box-shaped roof tube 12a constituting the box-shaped roof tube 11a at the corner portion. The engaging piece 18 provided in the portion 21a has a female screw hole 20 in the base portion 18a, and a bolt fastening hole 22 formed through the side surface portion 21a from the inside of the unit box-shaped roof tube 12a. The bolt member 23 to be mounted is screwed into the female screw hole 20 so as to be detachably fastened to the side surface portion 21a.

  That is, in the first embodiment, the engagement piece 18 provided on the side surface portion 21a of the unit box roof tube 12a at the corner portion is made of, for example, L-75 × 75 × 9 angle steel, and the unit box roof The side wall 21a on one side of the pipe 12a and the side wall 21a on the lower side are arranged in parallel with a space between them, and are attached at two locations over the substantially entire length of the unit box-shaped roof pipe 12a. The engaging piece 18 is formed with a plurality of female screw holes 20 at intervals in the longitudinal direction by, for example, threading the one side portion 18a of the L-shaped cross section. These female screw holes 20 can also be formed by fixing a nut member to the inner surface of the one side portion 18a.

  On the other hand, in the first embodiment, a bolt fastening hole 22 is provided along the attachment position of the engagement piece 18 in one side surface portion 21a and the lower side surface portion 21a of the unit box-shaped roof pipe 12a. In addition, a plurality of through holes are formed at intervals in the longitudinal direction. These bolt fastening holes 22 can be used by directly using the grout injection holes formed in advance on the outer peripheral surface including the side surface portion 21a of the unit box-shaped roof pipe 12a.

  In the first embodiment, the plurality of female screw holes 20 formed on one side as the base portion 18a of the engagement piece 18 are connected to the side surface portion 21a on one side of the unit box-shaped roof tube 12a and the lower side thereof. When the bolt member 23 is screwed and fastened by an operation from the inside of the unit box-shaped roof tube 12a in a state of being matched with the plurality of bolt fastening holes 22 formed in the side surface portion 21a, the engagement piece 18 is The one side portion (base portion) 18a is brought into close contact with the side surface portion 21a, and the other side portion 18b is detachably fixed in a state of protruding from the side surface portion 21a into a flat cross-sectional shape.

  In the first embodiment, the side wall 21b of the box-shaped roof tube 11b adjacent to the side and the side wall 21b of the box-shaped roof tube 11c adjacent to the lower side, which form the joint 16 together with the engagement piece 18, are provided. The protruding engagement pieces 19 are the same engagement pieces having a flat cross-sectional shape that are integrally joined to the side portions 21b and 21c, respectively. In addition, the engagement pieces 19 are attached to the joint portions 16 at positions adjacent to the outside of the engagement pieces 18 so as to sandwich the pair of L-shaped cross-section engagement pieces 18. become.

  And according to the joint structure 10 of the box-shaped roof pipe of the first embodiment having the above-described configuration, the unit box-shaped roof pipe 11a at the corner portion and the unit box-shaped roof pipes 11b and 11c adjacent thereto are provided. It is possible to easily release the engagement of the joint portion 16 by the engagement pieces 18 and 19 between them, and even when the reaching shaft 13 is narrow, the unit box shape pushed out to the reaching shaft 13 without much labor is required. It becomes possible to easily carry out the work of lifting and dismantling the roof tube 11.

  That is, according to the first embodiment, the engagement piece 18 provided on the side surface portion 21a of the unit box-shaped roof pipe 12a arranged at the corner portion has the female screw hole 20 on the base portion (one side portion) 18a. The bolt member 23 that is mounted from the inside of the unit box-shaped roof tube 12a is screwed into the female screw hole 20 into the bolt fastening hole 22 that is formed to penetrate the side surface portion 21a. Since the unit box-shaped roof tube 11 pushed out to the reaching shaft 13 is dismantled and removed, an operator enters the inside of the unit box-shaped roof tube 12a at the corner, If the bolt member 23 is removed by work from the inside of the unit box-shaped roof tube 12a, the engaging piece 18 can be easily removed from the side surface portion 21a of the unit box-shaped roof tube 12a. Get in the way Unit box-shaped roof tube 12a of without corners and it is possible to quickly dismantled to.

  If the unit box roof pipe 12a at the corner portion is dismantled and removed, the remaining unit box roof pipe 12 has a joint portion between the adjacent unit box roof pipes 12 only on one side surface. Therefore, it is possible to easily dismantle and remove one after another while releasing the engaged state with a slight movement.

6 to 8 illustrate a box-shaped roof pipe joint structure 40 according to a reference example . According to this reference example , the unit box-shaped roof tube 12a disposed at one joint angle portion of the lateral roof row 14 and the vertical roof row 15 and the unit box-shaped roof tube 12b adjacent to the side thereof. A joint structure 40 of a box-shaped roof pipe is adopted in the joint part 16 between the two and the joint part 16 'between the unit box-shaped roof pipe 12c adjacent to the lower part is the same as the conventional joint part. For example, a joint structure with an engagement piece 24 having a flat cross-sectional shape is employed.

And in the joint structure 40 of the box-shaped roof pipe of this reference example , a pair of engagement pieces 41 are provided on the side surface portion 21a on the side of the corner-shaped unit box-shaped roof pipe 12a which is one adjacent unit box-shaped roof pipe. These engagement pieces 41 are integrally joined to a base plate 42 arranged along the side surface portion 21a, and attached so as to protrude in an L-shaped cross-sectional shape. Also, a female screw hole 43 is formed with the base plate 42 as a base, and a bolt that is attached to the female screw hole 43 from the inside into a bolt fastening hole 22 formed through the side surface portion 21a of the unit box-shaped roof tube. By engaging the member 23, the engagement piece 41 is attached so as to protrude from the side surface portion 21a into an L-shaped cross-sectional shape.

In this reference example , a plurality of nut fitting recesses 44 are formed in the base plate 42 as the base of the engagement piece 41, and the nut members 45 are fitted and fixed to the nut fitting recesses 44, respectively. Thus, a plurality of female screw holes 43 are provided in the base plate 42 at intervals in the longitudinal direction.

Furthermore, in this reference example , the pair of engaging pieces 46 provided to protrude from the side surface portion 21b of the box-shaped roof pipe 11b adjacent to the side, which constitutes the joint portion 16 together with the engaging piece 41, are provided on the side surface portions. This is an engagement piece similar to the conventional one having an L-shaped cross-sectional shape integrally joined to 21b. Further, these engagement pieces 46 are engaged with the pair of L-shaped cross-section engagement pieces 41 of the corner portion unit box-shaped roof pipe 12a in the joint portion 16 so as to be hooked. Each is attached to a position adjacent to the inside of the combination piece 41.

Also, with the box-shaped roof pipe joint structure 40 of this reference example , when the unit box-shaped roof pipe 11 pushed out to the reach shaft 13 is dismantled and removed, work is performed inside the corner-shaped unit box-shaped roof pipe 12a. If an operator enters and the bolt member 23 is removed by work from the inside of the unit box-shaped roof tube 12a, the engagement piece 41 can be easily removed from the side surface 21a of the unit box-shaped roof tube 12a together with the base plate 42. Thus, it becomes possible to quickly dismantle and remove the unit box-shaped roof pipe 12a at the corner portion, and the same effect as the joint structure 10 of the box-shaped roof pipe of the first embodiment can be obtained. become.

  The present invention is not limited to the above-described embodiments, and various modifications can be made.

10, 40 Box-shaped roof pipe joint structure 11 Box-shaped roof pipe 11a Corner-shaped box-shaped roof pipe 11b Box-shaped roof pipe 11c adjacent to the side Box-shaped roof pipe 12c adjacent to the lower side Unit-shaped roof-shaped tube 12a Square Unit box-shaped roof pipe 12b of the part Unit box-shaped roof pipe 12c adjacent to the side Unit box-shaped roof pipe 13 adjacent to the lower side Reaching shaft 14 Horizontal roof row 15 Vertical roof row 16 Joint portion 17 Box structure 18 Engagement piece 18a One side of L-shaped cross section (base of engagement piece)
18b Other side portion of L-shaped cross section 19 Engagement pieces 20, 43 Female screw holes 21a, 21b, 21c Side face portion 22 of unit box-type roof tube Bolt fastening hole 23 Bolt member 41 Engagement piece 42 Base plate (engagement) Piece base)
46 Engagement piece

Claims (1)

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. It was used in the box-type roof construction method to be 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 tubes, and pushed out to the reaching shaft A joint structure of a joint portion between adjacent box roof tubes that facilitates dismantling and removal of the unit box roof tube,
A lateral roof row composed of a plurality of the box-shaped roof tubes arranged along the ceiling portion of the box structure, and a plurality of the box shapes arranged along side walls on both sides of the box structure. Of the pair of joint angle portions with a pair of longitudinal roof rows made of roof tubes, the unit box-shaped roof tube disposed at one joint angle portion is sequentially dismantled and removed.
The joint portion includes a plurality of engagement pieces provided to protrude from a side surface portion of one of the adjacent unit box-shaped roof tubes, and a plurality of engagement pieces provided to protrude from a side surface portion of the other unit box-shaped roof tube. It is constituted by engaging the engagement piece,
In addition, the engagement piece provided on one side surface portion and the lower side surface portion of the unit box-shaped roof pipe disposed at the one joint angle portion has a female screw hole at its base portion. And screwing a bolt member, which is mounted from the inside of the unit box-shaped roof pipe, into a bolt fastening hole formed in the side surface portion so as to penetrate the female screw hole. It is detachably fastened to the lower side,
Engagement pieces provided on one side surface portion and the lower side surface portion of the unit box-shaped roof pipe disposed at the one joint angle portion are made of a steel material having an L-shaped cross section, and the L The female screw hole is formed with one side portion of the cross-sectional shape as the base, and the other side portion protrudes from the side surface portion into a flat cross-sectional shape by screwing the bolt member into the female screw hole. Is attached,
Engagement pieces provided to project from the side surface portion of the box-shaped roof tube adjacent to the side of the unit box-shaped roof tube and the side surface portion of the box-shaped roof tube adjacent to the lower side, which are disposed at the one joint angle portion. These are joint structures of box-shaped roof pipes, each being an engagement piece having a flat cross-sectional shape, integrally joined to these side surfaces.

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