Box-shaped roof pipe for underpass construction method

Abstract

To provide a box shape roof pipe for an underpass method capable of effectively supporting load from upward and efficiently carrying out friction cutting in a simple structure.SOLUTION: A box shape roof pipe is provided with a U-shaped upper flat piece 11 separably connected and a U-shaped lower piece 12, wherein a height adjustment metal fitting 13 is arranged extendingly in an axial direction of a box shape roof pipe 10 below a lower surface of a top plate part 11a of the U-shaped upper flat piece 11 and fixed parallely to the top plate part 11a. On the height adjustment metal fitting 13, a load bearing roller member 14 including a rotation roller 14a having a rotation axis perpendicular to the axial direction of a box-shaped roof pipe 10 and parallel to the top plate part 11a is attached. Interposing the load bearing roller member 14 between a top surface part 15a of a box body structure 15 and the U-shaped upper flat piece 11 makes the box body structure 15 slide while supporting load from above.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a box-shaped roof pipe for an underpass method, and more particularly to a box-shaped roof pipe for an underpass method having a substantially quadrilateral hollow cross-sectional shape that constitutes a top surface box-shaped roof to be replaced with a box-shaped structure in the underpass method.

Background Art

[0002] The underpass method is adopted, for example, as a method for forming an underground space that crosses existing structures such as existing railways and roads under the ground. Known examples include the R&C method (registered trademark) (see, for example, Patent Document 1) and the SFT method (registered trademark) (see, for example, Patent Document 2). In the underpass method, for example, a box-shaped pipe member is continuously installed in the ground under an existing structure at a location where an underground space is to be formed, thereby forming a top surface box-shaped roof and a side surface box-shaped roof that support the existing structure from below. After that, the formed top surface box-shaped roof and side surface box-shaped roof are replaced by propelling a box-shaped structure having a rectangular cross-sectional shape to a location where an underground space is to be formed, thereby forming an underground space with the replaced box-shaped structure.

[0003] Furthermore, in the underpass construction method, when replacing the formed top and side box-shaped roofs with a box-shaped structure having a rectangular cross-section that has been propelled forward, there is a risk that the frictional force between the top surface of the top box-shaped roof or box-shaped structure and the ground above them may affect the ground above as the top box-shaped roof or box-shaped structure is pushed out. Therefore, a friction-cut plate, which is detachably attached to the top surface of the top box-shaped roof, is left in the ground while the top box-shaped roof or box-shaped structure is pushed out, thereby cutting the frictional force with the ground above them and preventing any impact on the ground above. This friction-cut plate is installed in the ground with the top surface of the top box-shaped roof in place, and when the box-shaped roof is replaced with the box-shaped structure, it is detached from the box-shaped roof with both ends of the ground (launching side and arrival side) fixed, and left in the ground. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2007-177553 [Patent Document 2] Japanese Patent Publication No. 2012-144942 [Patent Document 3] Japanese Patent Publication No. 2001-73670 [Overview of the project] [Problems that the invention aims to solve]

[0005] On the other hand, in recent years, there has been a demand to create underground spaces with larger hollow cross-sections at deeper locations underground, for example, using underpass construction methods. As a result, the top surface of the box-shaped roof or box-shaped structure is subjected to greater earth pressure and water pressure during propulsion, and greater frictional forces are generated between it and the ground above. Consequently, with conventional box-shaped roof construction methods, it becomes difficult to propel the box-shaped roof or box-shaped structure while cutting friction in a stable manner.

[0006] Furthermore, Patent Document 3 discloses a technology that enables the construction of underground structures by underpass construction even when it is not possible to construct a receiving tunnel. According to Patent Document 3, when propelling an underground structure while leaving a friction cut plate, which is detachably disposed on the upper part of the roof cylinder, in the ground, the roof cylinder, which is constructed by connecting short segments in the longitudinal direction, can be sequentially removed from the rear segment at the tip of the cutting edge of the underground structure and recovered on the receiving tunnel side. In addition, by connecting multiple reinforcing friction cut steel members that extend in the longitudinal direction to the upper part of the roof cylinder and interposing them between the friction cut plate and the roof cylinder, it is possible to prevent the friction cut plate from bending under load from above.

[0007] However, in the underpass construction method described in Patent Document 3, the cylindrical roof structure (box-shaped roof pipe) is constructed by joining multiple reinforcing friction-cut steel materials to the top and attaching a friction-cut plate with these multiple friction-cut steel materials interposed. This results in a complex structure, and excavation work must be performed from inside the tip of the cylindrical roof structure, not only across its entire cross-section but also in the area of ​​the friction-cut steel materials and friction-cut plate above it, making such excavation work difficult. Furthermore, when the underground structure passes below the friction-cut plate, a considerable amount of frictional force is still generated between the friction-cut steel materials and the top surface of the underground structure. For this reason, further improvements are needed for the box-shaped roof pipe used in the underpass construction method, particularly for the top surface box-shaped roof, so that it can support the load from above with a simpler structure while effectively cutting friction.

[0008] The present invention aims to provide a box-shaped roof pipe for underpass construction that can effectively support loads from above with a simpler configuration without requiring reinforcing steel materials on the outside of the pipe, and can effectively cut friction without generating large frictional forces between it and the underground structure (box structure) passing below. [Means for solving the problem]

[0009] The present invention relates to a box-shaped roof pipe for underpass construction, which has a roughly quadrilateral hollow cross-section and is installed in advance on the ground below an existing structure and replaces the top surface of a box-shaped structure having a rectangular cross-section, thereby forming an underground space by the box-shaped structure that crosses the ground directly below the existing structure. The box-shaped roof pipe is arranged in a series in the lateral direction along the top surface of the planned installation area of ​​the box-shaped structure on the ground below the existing structure, thereby forming the top box-shaped roof. The box-shaped roof pipe has a roughly quadrilateral hollow cross-section and consists of a U-shaped upper flat piece and a U-shaped lower piece that are vertically separable and connected at the upper ends of the side plates on both sides. The U-shaped upper flat piece has a strip-shaped height adjustment fitting supported on the lower surface of its top plate, and the box-shaped roof pipe The above objective is achieved by providing a box-shaped roof pipe for underpass construction, which extends in the axial direction and is fixed in a position parallel to the top plate portion, and when the box structure is propelled after the top surface box-shaped roof is installed on the ground below the existing structure, the U-shaped lower piece is separated from the U-shaped upper flat piece and replaced with the top surface portion of the box structure, while the U-shaped upper flat piece is left in place to function as a friction-cutting member, and a load-bearing roller member including a rotating roller having a rotation axis perpendicular to the axial direction of the box-shaped roof pipe and parallel to the upper surface of the top plate portion of the U-shaped upper flat piece is attached to the height adjustment hardware in a height-adjustable manner, and interposed between the top surface portion of the box structure and the U-shaped upper flat piece, thereby enabling the box structure to slide while supporting a load from above.

[0010] Furthermore, it is preferable that the box-shaped roof pipe for the underpass construction method of the present invention has the U-shaped upper flat piece and the U-shaped lower piece connected to each other so as to be separable vertically by pin joints.

[0011] Furthermore, it is preferable that the box-shaped roof pipe for underpass construction according to the present invention is formed by integrating a plurality of unit box-shaped roof pipes, each having a roughly quadrilateral hollow cross-section, in the axial direction.

[0012] Furthermore, it is preferable that the box-shaped roof pipe for underpass construction according to the present invention is formed by connecting a plurality of shorter unit U-shaped lower pieces in an axial direction to the lower part of a unit U-shaped upper flat piece of a predetermined length, so as to be separable vertically.

[0013] Furthermore, it is preferable that the box-shaped roof pipe for the underpass construction method of the present invention has a hollow cross-section with a roughly quadrilateral shape, with a width of 800 to 1400 mm and a height of 800 to 1400 mm.

[0014] Furthermore, it is preferable that the box-shaped roof pipe for underpass construction according to the present invention be used in the R&C method (registered trademark), in which excavation work is performed at the face of the front portion of the box structure. [Effects of the Invention]

[0015] According to the box-shaped roof pipe for underpass construction methods of the present invention, loads from above can be effectively supported with a simpler configuration without the need to provide reinforcing steel materials on the outside of the pipe, and friction can be effectively reduced without generating large frictional forces between the pipe and the underground structure (box structure) passing below. [Brief explanation of the drawing]

[0016] [Figure 1] A preferred embodiment of the present invention describes a box-shaped roof pipe for an underpass construction method, where (a) is a cross-sectional view and (b) is a cross-sectional view showing the U-shaped upper flat piece and the U-shaped lower piece separated. [Figure 2] This is a perspective view illustrating a load-bearing roller component. [Figure 3]It is a schematic longitudinal sectional view for explaining the process of pushing a box-shaped roof pipe to form a box-shaped roof on the top surface section. [Figure 4] It is a schematic longitudinal sectional view (a) and a schematic longitudinal sectional view along A-A of (a) for explaining the process of pushing a box-shaped roof pipe to form a box-shaped roof. [Figure 5] It is a schematic longitudinal sectional view for explaining the situation of forming a box-shaped structure inside a working shaft. [Figure 6] It is a schematic perspective view for explaining the situation of forming a box-shaped structure inside a working shaft. [Figure 7] It is a schematic longitudinal sectional view for explaining the situation of advancing a box-shaped structure while excavating the ground inside a box-shaped roof by the R&C method. [Figure 8] It is a schematic perspective view for explaining the situation of advancing a box-shaped structure while excavating the ground inside a box-shaped roof by the R&C method. [Figure 9] It is a schematic longitudinal sectional view for explaining the underground space formed by a box-shaped structure crossing under an existing structure. [Figure 10] It is a schematic perspective view for explaining the underground space formed by a box-shaped structure crossing under an existing structure.

Modes for Carrying Out the Invention

[0017] The box-shaped roof pipe 10 for the underpass method according to a preferred embodiment of the present invention shown in FIGS. 1(a) and 1(b) is used as each box-shaped pipe member constituting the top surface box-shaped roof 21 in the R&C method (registered trademark) that can form another newly constructed underground space 26 (see FIGS. 9 and 10) by replacing the top surface box-shaped roof 21 of the box-shaped roof 20 previously installed in the ground below an existing structure 30 as an underpass method, for example, as shown in FIGS. 3 to 8, by a box-shaped structure 15 installed across the directly below part of the existing structure 30. In this embodiment, a site wide enough to form the working shaft 31 cannot be secured, and thus, each working process of the R&C method is carried out in the narrow-space working shaft 31. Also, since an existing facility structure 40 (see FIGS. 3 and 5) is formed as an underground structure on the arrival side of the box-shaped structure ******** across the existing structure 30, each working process of the R&C method is carried out without providing a shaft on the arrival side and using only the departure-side shaft as the working shaft 31.

[0018] The box-shaped roof pipe for the underpass method of this embodiment consists of a U-shaped upper flat piece ******** that is detachably connected vertically and a U-shaped lower piece . By leaving the U-shaped upper flat piece ******** in the ground and using it as a friction cut member, it is possible to effectively support the load from above with a simpler configuration without providing reinforcing steel on the outside of the pipe, and also to effectively cut friction without generating a large frictional force between the box-shaped structure 15 passing through below.

[0019] It should be noted that there are some unclear parts in the original text (such as the incomplete description in the middle of the text in and some missing content in ), which may affect the accuracy of the translation. You can check and correct the original text to get a more accurate translation result.Furthermore, the box-shaped roof pipe 10 for the underpass construction method of this embodiment is installed in advance on the ground below the existing structure 30 in the underpass construction method and replaces the top surface 15a of the box-shaped structure 15 which has a rectangular cross-section (see Figure 7). It is a box-shaped pipe member for the underpass construction method that has a roughly quadrilateral hollow cross-section and constitutes a top surface box-shaped roof 21 for forming an underground space 26 (see Figures 9 and 10) formed by the box-shaped structure 15 that crosses the ground directly below the existing structure 30. Multiple box-shaped roof pipes 10 are arranged in a continuous manner in the lateral direction along the top surface of the planned installation area of ​​the box-shaped structure 15 on the ground below the existing structure 30, thereby forming the top surface box-shaped roof 21 (see Figures 3 and 4(b)). As shown in Figures 1(a) and (b), the box-shaped roof pipe 10 has a roughly quadrilateral hollow cross-section and consists of a U-shaped upper flat piece 11 and a U-shaped lower piece 12 that are vertically separable and connected at the upper ends of the side plate portions 10a on both sides. A strip-shaped height adjustment fitting 13 is supported on the lower surface side of the top plate portion 11a of the U-shaped upper flat piece 11 and extends in the axial direction of the box-shaped roof pipe 10, and is fixed in place parallel to the top plate portion 11a. The height of the U-shaped upper flat piece 11 is lower than that of the U-shaped lower piece 12. After the box-shaped roof 21 is installed on the ground below the existing structure 30, when the box structure 15 is propelled, the U-shaped lower piece 12 is separated from the U-shaped upper flat piece 11 and replaced with the top surface 15a of the box structure 15, while the U-shaped upper flat piece 11 is left in place to function as a friction-cutting member (see Figure 7). Furthermore, a load-bearing roller member 14 (see Figure 2), including a rotating roller 14a having a rotation axis perpendicular to the axial direction of the box-shaped roof pipe 10 and parallel to the upper surface of the top plate portion 11a of the U-shaped upper flat piece 11, is attached to the height adjustment hardware 13 in an adjustable height manner. By interposing between the top surface 15a of the box structure 15 and the U-shaped upper flat piece 11, it enables the box structure 15 to slide while supporting the load from above.

[0020] In this embodiment, prior to the work of forming an underground space 26 by a box structure 15 in the ground below the existing structure 30, preferably using the R&C method, a work shaft 31 (see Figure 3) that will serve as a work base is formed on one side of the existing structure 30. In this embodiment, as described above, since other existing equipment structures 40 are formed on the other side of the existing structure 30, the work shaft 31 is formed on only one side, and each work process is carried out. The work shaft 31 can be easily formed, for example, in the same way as a shaft formed in the shield tunneling method using a shield tunneling machine, by forming a retaining wall 32 using sheet piles and ground improvement with excellent watertightness, preferably using the SMW method, and then excavating to a predetermined depth while retaining the earth inside. The surface on the side of the work shaft 31 is protected by sheet piles and supported by shoring such as bracing. The formed working shaft 31 will be appropriately equipped with propulsion equipment for moving the box-shaped roof pipe 10 and the box-shaped structure 15, as well as removal equipment for removing the U-shaped lower piece 12 of the box-shaped roof pipe 10 (see Figure 5).

[0021] Furthermore, in this embodiment, as shown in Figures 3 and 4(a) and (b), known propulsion equipment (not shown) is installed in the formed working shaft 31, and, similar to the conventional R&C method, multiple box-shaped roof pipes 10 that form the top box-shaped roof 21, and box-shaped roof pipes 10', 10'' that form the side box-shaped roofs 22 and bottom box-shaped roofs 23 are arranged in a continuous line along the top, both side, and both ends of the bottom portion of the planned installation area of ​​the box structure 15, and are driven and pushed from the working shaft 31 into the ground below the existing structure 30. This makes it possible to form a box-shaped roof 20 that includes, preferably, the bottom box-shaped roofs 23 at the end corners on both sides, in addition to the top box-shaped roof 21 and side box-shaped roofs 22 that cross the portion directly below the existing structure 30.

[0022] Here, the box-shaped roof pipes 10 that form the top box-shaped roof 21 each preferably have a roughly quadrilateral hollow cross-section (in this embodiment, a roughly square hollow cross-section) with a width of 800 to 1400 mm and a height of 800 to 1400 mm, and have an interior space large enough for workers to enter and work inside. The box-shaped roof pipes 10', 10'' that form the side box-shaped roof 22 and the bottom box-shaped roof 23 have, for example, a roughly square hollow cross-section with a length and width of 800 to 1400 mm, and in this embodiment, they are buried in the ground without being recovered into the work shaft 31 (see Figure 10). These box-shaped roof pipes 10, 10', 10'' are installed in the ground with an extension sufficient to traverse the ground directly below the existing underground structure 30, by sequentially joining unit pipes that have been divided into appropriate lengths.

[0023] Furthermore, the box-shaped roof pipe 10 of this embodiment, which forms the top box-shaped roof 21, has a hollow cross-section that is approximately quadrilateral (approximately square) in shape, as described above, and consists of a U-shaped upper flat piece 11 and a U-shaped lower piece 12 that are vertically separable and connected at the upper ends of the side plate portions 10a on both sides. A strip-shaped height adjustment fitting 13 is supported on the lower surface side of the top plate portion 11a of the U-shaped upper flat piece 11, and extends in the axial direction of the box-shaped roof pipe 10, and is fixed in place parallel to the top plate portion 11a.

[0024] In this embodiment, as shown in Figures 1(a) and (b), the box-shaped roof pipe 10 has a roughly square hollow cross-section with dimensions of approximately 1400 mm in width and 1400 mm in height. For example, at the upper end portion of the side plate portions 10a on both sides, at a height of approximately 1250 mm from the bottom plate portion 10b, a U-shaped upper flat piece 11 and a U-shaped lower piece 12 are connected as a single unit so as to be easily detachable, preferably by pin joints. Specifically, a lower flange 12a is fixed to the upper edge of the U-shaped lower piece 12 by welding or the like, so as to protrude inward, and engaging pins 12b are erected at predetermined intervals along the length of the box-shaped roof pipe 10, protruding upward from the lower flange 12a. An upper flange 11b is fixedly attached to the lower edge of the U-shaped upper flat piece 11 by welding or the like, so as to protrude inward. The upper flange 11b has engagement holes for engaging the engagement pins 12b of the lower flange 12a, which are arranged at predetermined intervals along the length of the box-shaped roof pipe 10, at positions corresponding to the engagement pins 12b of the lower flange 12a. By engaging the engagement pins 12b of the lower flange 12a with the engagement holes of the upper flange 11b, the U-shaped upper flat piece 11 and the U-shaped lower piece 12 can be connected as a single unit vertically while remaining easily separable.

[0025] Furthermore, in this embodiment, a pair of linear convex ribs 11c are fixed to the central part in the lateral direction of the lower surface of the top plate portion 11a of the U-shaped upper flat piece 11 by welding or the like, and are attached to the box-shaped roof pipe 10 in the longitudinal direction, extending parallel to each other. A strip-shaped height adjustment fitting 13 is attached to the linear convex ribs 11c by welding or the like, supported on the lower surface side of the top plate portion 11a via these linear convex ribs 11c. The height adjustment fitting 13 extends in the longitudinal direction of the box-shaped roof pipe 10, similar to the linear convex ribs 11c, and is positioned parallel to the top plate portion 11a, and is attached at a height position that does not protrude downward beyond the upper flange 11b. On the lower side of the height adjustment fitting 13, the U-shaped lower piece 12 is separated from the U-shaped upper flat piece 11, and when the U-shaped upper flat piece 11 functions as a friction-cutting member, the load-bearing roller member 14 shown in Figure 2 is attached at predetermined intervals along the length of the box-shaped roof pipe 10 prior to the top surface 15a of the box structure 15 passing below it. The load-bearing roller member 14 is attached to the lower side of the height adjustment fitting 13 with its height adjusted so that the lower end of the rotating roller 14a is preferably positioned below the upper flange 11b, for example, at a height of about 200 mm from the top plate portion 11a.

[0026] In this embodiment, the box-shaped roof pipe 10 is formed by axially connecting and integrating multiple unit box-shaped roof pipes, each having a hollow cross-section preferably with a roughly quadrilateral (approximately square) shape and a length of, for example, about 3 m, using known joining means such as bolt joints or pin joints, to form a predetermined length.

[0027] Furthermore, in this embodiment, the unit box-shaped roof pipe is formed by connecting multiple unit U-shaped lower pieces 12c (see Figures 7 and 8), each shorter than a unit U-shaped upper flat piece (for example, 1 m in length), to the lower part of a U-shaped upper flat piece (for example, 3 m in length), with these pieces connected and integrated in the axial direction, and detachably connected vertically. This allows the box-shaped roof pipe 10 forming the top box-shaped roof 21 to be removed sequentially from the rear end of each unit U-shaped lower piece 12c into the box structure 15, while leaving each of the unit U-shaped upper flat pieces constituting the U-shaped upper flat piece 11, which acts as a friction-cutting member, in the ground. These unit U-shaped lower pieces 12c can be connected and integrated in the axial direction using known joining means such as bolt joints or pin joints.

[0028] Once a box-shaped roof 20, including a top box-shaped roof 21, side box-shaped roofs 22, and bottom box-shaped roof 23, is formed in the planned installation area of ​​the box-shaped structure 15 that crosses the portion directly beneath the existing structure 30, in this embodiment, preferably the side box-shaped roofs 22 and bottom box-shaped roofs 23 are left in the ground, and only the top box-shaped roof 21 is replaced with the top portion 15a. The box-shaped structure 15 is then propelled from the work shaft 31 toward the ground directly beneath the existing structure 30 by a propulsion device 27 installed in the work shaft 31, thereby forming an underground space 26 with the box-shaped structure 15 (see Figures 7 to 10).

[0029] In this embodiment, as described above, since the work is carried out in a narrow working shaft 31, the box structure 15 is formed by a plurality of precast concrete unit box bodies 16 that are continuously connected and integrated in the axial direction. The unit box body 16 is formed by assembling a plurality of precast pieces 16a, which are divided pieces in the circumferential direction, as a single unit in the working shaft 31, so that it has a thickness of about 1 m, which corresponds to, for example, the jack stroke of the propulsion equipment 27. That is, as shown in Figures 5 and 6, each unit box body 16 is formed by assembling precast pieces 16a that have been suspended from the ground into the working shaft 31 in the working shaft 31, and the formed unit box bodies 16 are sequentially connected in the axial direction and propelled as the box structure 15 toward the ground directly below the existing structure 30 by the propulsion equipment 27 installed in the working shaft 31 (see Figure 7).

[0030] In this way, for example, the unit box bodies 16 formed for each jack stroke of the propulsion equipment 27 are assembled as components of the box structure 15, similar to the conventional R&C method, by sequentially connecting them from the rear side in the propulsion direction of the box structure 15. The box structure 15 formed in this way is propelled from the working shaft 31 toward the ground directly beneath the existing structure 30, while the top surface 15a replaces the U-shaped lower piece 12 of each box-shaped roof pipe 10 of the top box-shaped roof 21, leaving each U-shaped upper flat piece 11 in the ground as a friction-cutting member. This makes it possible to form the underground space 26 created by the box structure 15 across the ground directly beneath the existing structure 30 (see Figures 9 and 10).

[0031] Furthermore, in this embodiment, as described above, preferably as an underpass construction method using the R&C method, as shown in Figure 7, the box structure 15 is advanced while excavating the ground inside the box-shaped roof 20 at the face 28, and since only the starting shaft is used as the working shaft 31, as also shown in Figure 8, the U-shaped upper flat piece 11 and the U-shaped lower piece 12 of the box-shaped roof pipe 10 that constitute the top box-shaped roof 21 are separated by pulling out the engagement pin 12b, and the box structure 15 is advanced into the ground below the existing underground structure 30 while each unit U-shaped lower piece 12c is collected in the working shaft 31.

[0032] In other words, in this embodiment, a roof support steel shell 17 is installed at the leading end of the box structure 15 in the direction of propulsion, interposed between it and the box-shaped roof 20, and comprising a pair of rectangular frames 18a and 18b having an outer circumference shape that follows the cross-sectional shape of the box structure 15 (see Figures 5 and 6). The roof support steel shell 17 is composed of a roof-side rectangular frame 18a and a box-side rectangular frame 18b, and a plurality of connecting steel members 19 that join and integrate these rectangular frames 18a and 18b in a parallel arrangement. The presence of the roof support steel shell 17 provides a gap between the rectangular frames 18a and 18b that allows the unit U-shaped lower piece 12c of the box-shaped roof pipe 10 to pass through and allows workers to enter. Furthermore, the roof support steel shell 17 supports the rear end portion of the box-shaped roof on the upper steel portion of the roof-side rectangular frame 18a by placing it on the upper steel portion of the roof-side rectangular frame 18a and supporting the rear end portion from below. With the box-side rectangular frame 18b in contact with the front surface of the box structure 15, it is designed to move forward together with the box structure 15 as the box structure 15 is propelled.

[0033] In this embodiment, as the box-shaped structure 15 is advanced while the ground inside the box-shaped roof 20 is excavated at the face 28, the unit U-shaped lower pieces 12c at the rear end of each box-shaped roof pipe 10 that constitute the top surface box-shaped roof 21, which have protruded directly above the gap between the roof-side rectangular frame 18a and the box-shaped structure side rectangular frame 18b, can be collected into the inside of the box-shaped structure 15 via these gaps and removed sequentially (see Figures 7 and 8).

[0034] Furthermore, when removing the unit U-shaped lower piece 12c, the load from above in the portion between the tip of the box structure 15 and the face 28 is supported from below by the U-shaped upper flat piece 11, which functions as a friction-cutting member and whose tip portion is placed on the top surface 15a of the box structure 15 via the load-bearing roller member 14. In this embodiment, as shown in Figures 1(a) and (b), the U-shaped upper flat piece 11 has a flat U-shaped cross-sectional shape with both sides bent downwards, which provides considerable rigidity compared to a flat friction-cutting plate, making it possible to support the load from above in a stable state. In addition, in this embodiment, the U-shaped upper flat piece 11 has a strip-shaped height adjustment fitting 13 fixed to the lower surface of its top plate portion 11a via a pair of linear convex ribs 11c. As a result, the rigidity is further increased by these height adjustment fittings 13 and linear convex ribs 11c, making it possible to support loads from above in a more stable state.

[0035] Furthermore, in this embodiment, after separating and sequentially removing the unit U-shaped lower piece 12c at the rear end of each box-shaped roof pipe 10 constituting the top box-shaped roof 21 from the unit U-shaped upper flat piece 11, the load-bearing roller member 14 is attached to the lower side of the height adjustment fitting 13 attached to the lower surface of the top plate portion 11a of the remaining U-shaped upper flat piece 11, preferably by working in the space between the roof-side rectangular frame 18a and the box-side rectangular frame 18b of the roof support steel shell 17, so that it is positioned at a predetermined distance in the axial direction of the box-shaped roof pipe 10. The load-bearing roller member 14 can preferably be attached with its height adjusted by interposing a height adjustment plate, such that the lower end of the rotating roller 14a, which has a rotation axis perpendicular to the axial direction of the box-shaped roof pipe 10 and parallel to the upper surface of the top plate portion 11a of the U-shaped upper flat piece 11, is positioned at a height of, for example, about 200 mm from the top plate portion 11a. This makes it possible to place the U-shaped upper flat piece 11, which functions as a friction-cutting member, on the top surface portion 15a of the box structure 15 with the rotating roller 14a of the load-bearing roller member 14 interposed therebetween, thereby preventing large frictional forces from being generated between them, and making it possible to smoothly move and propel the box structure 15, which consists of multiple unit boxes 16, while the U-shaped upper flat piece 11 functions as a friction-cutting member.

[0036] As a result, the box-shaped roof pipe 10 for underpass construction in this embodiment can effectively support loads from above with a simpler configuration without requiring reinforcing steel materials on the outside of the pipe, and can effectively cut friction without generating large frictional forces between the U-shaped upper flat piece 11, which functions as a friction-cutting member, and the box structure 15 that passes below it. Furthermore, there is no need to excavate beyond the entire cross-section of the box-shaped roof pipe 10.

[0037] In this way, in this embodiment, the box structure 15 is driven into the ground, and the tip of the box structure 15 reaches, for example, the improved ground at the tip end on the forward side in the direction of propulsion, sandwiching the existing structure 30, thereby forming an underground space 26 by the box structure 15 installed across the portion directly beneath the existing underground structure 30 (see Figures 9 and 10). The formed underground space 26 can be used in communication with the existing equipment structure 40 by, for example, removing the side wall 40a in the portion corresponding to the underground space 26 of another existing equipment structure 40 (see Figure 9).

[0038] It should be noted that the present invention is not limited to the above embodiments and can be modified in various ways. For example, the existing structure in which an underground space is formed by a box-shaped structure in the ground below may be an existing structure for subways or roads, or any other type of existing structure such as a building basement or a sewer pipeline. Furthermore, the box-shaped roof on the top surface using the box-shaped roof pipe for the underpass construction method of the present invention, or the box-shaped structure that replaces it, may be propelled toward the working shaft on the receiving side, with a working shaft also provided on the receiving side, across from the existing structure. If a working shaft is also provided on the receiving side, the box-shaped roof on the top surface using the box-shaped roof pipe of the present invention can also be used as an underpass construction method in the SFT method (registered trademark), in which the ground and soil remaining inside the box-shaped roof are removed from the working shaft on the receiving side.

[0039] 10 Box-shaped roof pipes for underpass construction 10', 10" Box-shaped roof pipe 10a Side plate part 10b Bottom plate part 11 U-shaped upper flattened piece 11a Top panel 11b Upper flange 11c Linear convex rib 12 U-shaped lower pieces 12a Lower flange 12b Engagement pin 12c Unit U-shaped lower piece 13 Height adjustment hardware 14 Load-bearing roller component 14a Rotating roller 15 Box structure 15a Top section 16 Unit Box 16a Precast Piece 17. Roof support steel shell 18a Roof-side rectangular frame 18b Box-side rectangular frame 19 Connecting steel 20 Box-shaped roof 21 Top box roof 22 Side box-shaped roof 23 Box-shaped roof at the bottom 26 Underground space 27 Propulsion equipment 28. The face of the pipe 30 Existing structures 31. Working shaft 32 Retaining wall 40 Existing equipment structures 40a Side wall of the section corresponding to the underground space

Claims

1. In an underpass construction method, a box-shaped roof pipe for an underpass construction method, having a roughly quadrilateral hollow cross-section, is installed in advance on the ground below an existing structure and replaces the top surface of a box-shaped structure having a rectangular cross-section, thereby traversing the ground directly below the existing structure and forming an underground space by the box-shaped structure, wherein the top surface of the box-shaped roof is formed by the box-shaped structure, The box-shaped roof pipes are arranged in a series in the lateral direction along the top surface of the planned installation area of ​​the box-shaped structure in the ground below the existing structure, thereby forming the top surface box-shaped roof. The box-shaped roof pipe has a hollow cross-section with approximately four sides, and consists of a U-shaped upper flat piece and a U-shaped lower piece that are detachably connected vertically at the upper ends of the side plates on both sides. A strip-shaped height adjustment fitting is supported on the underside of the top plate of the U-shaped upper flat piece, extending in the axial direction of the box-shaped roof pipe, and is fixed in place parallel to the top plate. A box-shaped roof pipe for underpass construction, wherein, after the box-shaped roof top is installed on the ground below the existing structure, when the box structure is propelled, the U-shaped lower piece is separated from the U-shaped upper flat piece and replaced with the top surface of the box structure, while the U-shaped upper flat piece is left in place to function as a friction-cutting member, and a load-bearing roller member, including a rotating roller having a rotation axis perpendicular to the axial direction of the box-shaped roof pipe and parallel to the upper surface of the top plate of the U-shaped upper flat piece, is attached to the height adjustment hardware in an adjustable height manner, interposed between the top surface of the box structure and the U-shaped upper flat piece, thereby enabling the box structure to slide while supporting a load from above.

2. The box-shaped roof pipe for underpass construction according to claim 1, wherein the U-shaped upper flat piece and the U-shaped lower piece are connected so as to be separable vertically by pin joints.

3. A box-shaped roof pipe for an underpass construction method according to claim 1 or 2, formed by connecting and integrating a plurality of unit box-shaped roof pipes having a roughly quadrilateral hollow cross-sectional shape in the axial direction.

4. The box-shaped roof pipe for underpass construction according to claim 3, wherein the unit box-shaped roof pipe is formed by connecting a plurality of unit U-shaped lower pieces, shorter in length than a unit U-shaped upper flat piece of a predetermined length, to the lower part of the unit U-shaped upper flat piece, while being axially connected and integrated, and detachably connected vertically.

5. A box-shaped roof pipe for underpass construction according to claim 1 or 2, having a roughly quadrilateral hollow cross-section with dimensions of 800 to 1400 mm in width and 800 to 1400 mm in height.

6. A box-shaped roof pipe for an underpass construction method according to claim 1 or 2, used in the R&C method (registered trademark) for which excavation work is performed at the face of the front portion of the box-shaped structure.

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