JP4926092B2 - How to build a box structure - Google Patents

Description

  The present invention relates to a method for constructing a box structure, and in particular, a box for constructing a hollow box structure having a rectangular cross section across a pier in a region including a lower portion of a bridge girder supported by the pier. The present invention relates to a method for constructing a body structure.

  For example, when existing underground structures such as railroad tracks or underpasses that cross the road are required to be rebuilt due to long-term use, it is necessary to widen these underground structures Various technologies have been developed that allow a new underground structure to be constructed while maintaining the state of use of railways and roads (see, for example, Patent Document 1).

In the remodeling method of the existing underground structure of Patent Document 1, when newly constructing a box structure that is a larger underground structure than the existing underground structure, side walls on both sides of the box structure and Along the section where the top panel is placed, the vertical pipe row and the horizontal pipe row are installed in the ground with rectangular pipes, and the end of the edge cutting plate placed on the upper surface of the horizontal pipe row is fixed. After the end face of the ready-made box structure is brought into contact with the vertical pipe row and the horizontal pipe row in a fixed state, the ground including the existing underground structure is passed through the hollow inside of the box structure. The box structure is moved forward while being removed, and the lower surface of the edge cutting plate placed on the upper surface of the rectangular pipe in the horizontal pipe row is used as a guide surface, and the existing box structure is moved in the vertical direction while leaving the edge cutting plate. By replacing pipe rows and transverse pipe rows, railways and roads While maintaining the use state, in which as a new building the underground construction with the box body structure.
Japanese Patent Publication No. 6-105025

  In the method of remodeling an existing underground structure described in Patent Document 1, an existing underground structure provided in a railroad rail or a foundation ground below a road is replaced with a longitudinal pipe made of an existing box structure. A hollow box structure that crosses the pier in a region that includes the lower part of the bridge girder supported by the pier because it is to build a new underground structure by replacing the row and the transverse pipe row. For example, when trying to construct a three-dimensional intersection road or passage, it is difficult to apply the technique described in Patent Document 1 as it is.

  That is, when a hollow box structure is installed across the bridge pier in the area including the lower part of the bridge girder supported by the pier, the lower part of the bridge girder is a hollow part where no foundation ground exists. In addition, since the bridge piers that cross the box structure will be removed, the load from the bridge girder must be kept strong and stable by some method during construction work in order to maintain the state of use of the railway and road. Need to support. Therefore, there is a demand for the development of a new technique for supporting the load from the bridge girder in a strong and stable state during the construction work of the box structure crossing the pier.

  In the present invention, when a hollow box structure having a rectangular cross section is constructed across a bridge pier in a region including a lower portion of the bridge girder supported by the bridge pier, the load from the bridge girder is strong and stable. It is an object of the present invention to provide a method for constructing a box structure that can replace the box structure with a longitudinal pipe row and a horizontal pipe row while supporting.

  The present invention is a box structure construction method for building a hollow box structure having a rectangular cross section across the pier in a region including a lower portion of a bridge girder supported by the pier, Along the step of excavating the ground of the portion where the side wall portion of the box structure under the bridge girder is arranged to construct a side shaft, along the position where the side wall portion of the box structure is provided, A step of stacking rectangular pipes horizontally installed from the side shaft to the height position of the top portion of the box structure and installing a vertical pipe row, and backfilling the side shaft, and the vertical pipe A step of filling a portion between the row and the bridge pier with earth and sand to form a support base for the horizontal pipe row, and an edge cutting plate placed on the top surface of the vertical pipe row. The lateral pipe row is connected in a lateral direction from a rectangular rectangular pipe. A step of installing a horizontally disposed rectangular pipe on the support base in a state where an edge-cutting plate is placed on an upper surface along a height position where a top portion of the box structure is provided; and And supporting the bridge girder with the girder member by attaching the girder member between the corner rectangular pipe and / or the rectangular pipe on the support base, and the rectangular shape on the support base. Including a step of connecting the rectangular pipes in a lateral direction from the pipes and installing the rectangular pipes constituting the lateral pipe row in a state of traversing the bridge piers and having an edge-cutting plate placed on the upper surface. When the vertical pipe row and the horizontal pipe row are installed along the side wall portion and the top plate portion on both sides of the object, the ready-made box structure provided on one side portion in the transverse direction across the bridge pier The end face of the longitudinal pipe And after directly or indirectly contacting the lateral pipe row, the ground structure including the pier is removed through the hollow interior of the box structure, and the box structure is sandwiched between the bridge piers. Extruding toward the other side in the transverse direction, leaving the edge-cutting plate as a guide surface with the lower surface of the edge-cutting plate placed on the upper surface of the rectangular pipe of the horizontal pipe row including the corner rectangular pipe remaining However, by replacing the box structure with the vertical pipe row and the horizontal pipe row, the box structure is constructed across the pier in a region including a lower portion of the bridge girder. The above object is achieved by providing a method for constructing a structure.

  In the box structure construction method of the present invention, in the step of supporting the bridge girder by the girder member, the girder member is an upper surface of the rectangular pipe on the corner portion and / or the rectangular pipe on the support base. It is preferable that it is installed so as to be slidable with respect to the edge-cutting plate placed on the board.

  Further, in the method for constructing a box structure according to the present invention, the method includes a step of extending an outer retaining wall outside the side shaft to a height position where a top part of the box structure is provided, In the step of backfilling the side shaft and filling the portion between the longitudinal pipe row and the pier with earth and sand, the portion extending between the retaining wall and the portion between the longitudinal pipe row It is also preferable to fill with earth and sand.

  According to the method for constructing a box structure of the present invention, when building a hollow box structure having a rectangular cross section across the pier in a region including a lower portion of the bridge girder supported by the pier, The box structure can be replaced with the longitudinal pipe row and the lateral pipe row while supporting the load from the bridge girder in a strong and stable state.

  As shown in FIGS. 1 and 2, a method for constructing a box structure according to a preferred embodiment of the present invention forms an underground structure for a road tunnel, for example, by passing under a rail 13 of a railway. The hollow box structure 10 having a rectangular cross-section for use in the installation and construction by replacing the longitudinal pipe row 11 and the lateral pipe row 12 provided in advance. .

  That is, in this embodiment, the box structure 10 is constructed so as to protrude from the foundation ground 14 to the lower part of the end beam 16 supported at one end by the pier 15 in the lower part of the railroad rail 13. Is planned. Therefore, in this embodiment, the box structure 10 is constructed across the pier 15, but even when the pier 15 is crossed, the end girder 16 is supported in a stable state and the railway is used. The construction method of the box structure 10 according to the present invention is employed so that the box structure 10 can be constructed while being held in the box.

  And the construction method of the box structure 10 of this embodiment crosses the pier 15 with the hollow box structure 10 which has a rectangular cross section in the area including the lower part of the bridge girder 16 supported by the pier 15. As shown in FIGS. 3 and 4, the side shaft 18 is constructed by excavating the ground where the side wall portion 10 a of the box structure 10 below the bridge girder 16 is disposed. The rectangular pipe 19a installed horizontally from the side shaft 18 to the height position of the top 10b of the box structure 10 along the position where the side wall 10a of the box structure 10 is provided. The vertical pipe row 11 is stacked and the side shaft 18 is filled with earth and sand 20 and backfilled, and the portion between the vertical pipe row 11 and the pier 15 is filled with earth and sand 20 Forming the support base 21 of the direction pipe row 12 The horizontal pipe row 12 is formed by connecting in a horizontal direction from a corner rectangular pipe 19b which is arranged at the uppermost stage of the vertical pipe row 11 and on which an edge cutting plate 22 (see FIG. 5) is placed. The rectangular pipe 19c installed horizontally is placed on the support base 21 in a state in which the edge cutting plate 22 (see FIG. 5) is placed on the upper surface along the height position where the top 10b of the box structure 10 is provided. The bridge beam 16 is supported by the beam receiving member 17 by attaching the beam receiving member 17 so as to be interposed between the bridge girder 16 and the rectangular pipe 19b and / or the rectangular pipe 19c on the support base 21. And a rectangular pipe 19c which is provided in a lateral direction from the rectangular pipe 19c on the support base 21 so as to form the lateral pipe row 12 crosses the pier 15 and has an edge cutting plate 22 on the upper surface (see FIG. 5). Is on And a step of placing in a state of being.

  In the present embodiment, when the longitudinal pipe row 11 and the lateral pipe row 12 are installed along the side wall portion 10a and the top plate portion 10b on both sides of the box structure 10 (see FIG. 1), the pier 15 is sandwiched. After the end face 10d of the ready-made box structure 10 provided on one side in the transverse direction is brought into direct or indirect contact with the longitudinal pipe row 11 and the lateral pipe row 12 (see FIG. 2), As shown in FIG. 8 to FIG. 10, the box structure 10 is sandwiched between the piers 15 while the earth and sand of the foundation ground 14 below the rails 13 including the piers 15 are removed through the hollow interior of the box structure 10. The lower surface of the edge cutting plate 22 (see FIG. 5) placed on the upper surface of the rectangular pipe 19c of the lateral pipe row 12 including the corner rectangular pipe 19b is extruded as the guide surface. Box structure 1 while leaving the edge-cutting plate 22 left. The by replacing the longitudinal pipe string 11 and the lateral pipe column 12, so as to build across the piers 15 of the box body structure 10 in a region including the lower portion of the girder 16.

  Furthermore, in this embodiment, as shown in FIG. 4, the process of extending upward the retaining wall 23a outside the side shaft 18 to a height position where the top part 10a of the box structure 10 is provided. In the step of backfilling the side shaft 18 and filling the portion between the longitudinal pipe row 11 and the pier 15 with the earth and sand 20, the portion 24 extending upward of the outer retaining wall 23 a and the longitudinal direction are included. The portion between the pipe row 11 is also filled with earth and sand 20.

  In the present embodiment, in the step of excavating the ground where the side wall portion 10a of the box structure 10 below the bridge girder 16 is disposed to construct the side shaft 18, as shown in FIG. A plurality of retaining piles made of, for example, H-shaped steel are driven into the ground below the bridge girder 16 adjacent to 15 at a predetermined interval along a pair of passage lines, and a lateral sheet pile is installed in the spacing portion of the retaining pile. While digging the ground between the pair of streets to a depth where the bottom 10c of the box structure 10 is located, and by attaching support members 25 such as kerfs and uplifts, both sides of the soil walls 23a, 23b The side shaft 18 in which the wall surface is protected is constructed. Moreover, the base part 18a is formed in the bottom part of the side part shaft 18, for example by laying and rolling a basic crushed stone. Further, a pedestal 26 of the rectangular pipe 19a is installed at a corner portion between the inner retaining wall 23b and the base portion 18a while being supported from the base portion 18a. In the present embodiment, the inner retaining wall 23b provided on the side of the pier 15 is disposed along a line inside the longitudinal pipe row 11 where the wall surface is pushed out by the side wall portion 10a of the box structure 10. (See FIG. 4).

  As shown in FIG. 4, in the process of stacking the rectangular pipes 19a horizontally installed along the position where the side wall 10a of the box structure 10 is provided, the longitudinal pipe row 11 is installed. Are sequentially stacked up to the height position of the top portion 10b of the box structure 10 from the pedestal 26 installed on the base portion 18a of the side shaft 18 along the wall of the inner retaining wall 23b. Go. Moreover, the vertical direction pipe row | line | column 11 is formed by attaching the square rectangular pipe 19b to the stacked uppermost stage.

  Here, as the rectangular pipe 19a and the corner rectangular pipe 19b constituting the longitudinal pipe row 11, for example, a known rectangular pipe used in the R & C method (manufactured by Okumura Corporation) can be preferably used. These rectangular pipes 19a and 19b can be joined and integrated easily in a vertically stacked state by being connected to each other via, for example, joint ribs protruding from the outer peripheral surface.

  Further, in the present embodiment, the retaining wall 23b inside the side shaft 18 is formed so that the wall surface thereof is disposed along the inside line of the longitudinal pipe row 11 as described above. . Accordingly, it is possible to facilitate the work of stacking the rectangular pipes 19a in at least the lower half portion of the longitudinal pipe row 11 using the wall surface of the inner retaining wall 23b as a guide. When the side shaft 18 is filled with earth and sand 20 and backfilled, the rectangular pipe 19a in the lower half of the longitudinal pipe row 11 is pressed against the inner retaining wall 23b by the earth pressure of the backfilled earth and sand 20. Can be supported. This makes it possible to install the longitudinal pipe row 11 in a more stable state. As will be described later, the inner retaining wall 23a is used together with the excavated earth and demolition glass and the like when the ready-made box structure 10 is pushed out while the excavated earth and sand of the pier 15 and the foundation ground 14 are removed. It will be removed through the hollow interior of the body structure 10.

  In the process of refilling the side shafts 18 and filling the portion between the formed longitudinal pipe row 11 and the pier 15 with earth and sand 20, good quality soil made of sandy soil or the like is used as the side sand 20, for example. 18 or the portion between the longitudinal pipe row 11 and the pier 15. In addition, the introduced earth and sand is sufficiently compacted for each predetermined spread thickness and is in a state of being firmly compacted.

  Here, in the present embodiment, as described above, the retaining wall 23a outside the side shaft 18 is provided so as to extend upward to a height position where the top portion 10b of the box structure 10 is provided. In addition, the earth and sand 20 is also filled in a portion between the extended portion 24 of the outer retaining wall 23a and the longitudinal pipe row 11. In order to extend the retaining wall 23a outside the side shaft 18 upward, it can be easily performed by various known methods such as a method of adding a retaining pile by welding or the like. Such a process of extending the outer retaining wall 23a upward can be performed after the side shaft 18 is backfilled, and before the side shaft 18 is backfilled, the outer retaining wall 23a is removed. It extends to the height position of the top part 10b of the box structure 10, and the earth and sand 20 can also be filled inside the extended part 24 when the side shaft 18 is backfilled.

  By filling the portion between the extended portion 24 of the outer retaining wall 23 a and the longitudinal pipe row 11 with the earth and sand 20, for example, the portion between the longitudinal pipe row 11 and the pier 15 is filled with the earth and sand 20. Then, when forming the support base 21 of the horizontal pipe row 12, the load at the time of rolling is firmly supported by the earth pressure from the opposite side across the vertical pipe row 11, and is sufficiently compacted. It is possible to easily form the stable support base 21 in a stable state.

  In the step of connecting the rectangular pipes 19c constituting the horizontal pipe row 12 on the support base 21 in the horizontal direction from the corner rectangular pipes 19b arranged at the uppermost stage of the vertical pipe row 11 in the horizontal direction, for example, The provided rectangular pipes 19c are arranged in a state where they are arranged on the support base 21 between the longitudinal pipe rows 11 and the piers 15 which are sufficiently compacted. In the present embodiment, the rectangular pipes 19 c are arranged in two rows on the support base 21 so as not to reach the pier 15.

  Here, the rectangular pipe 19c constituting the horizontal pipe row 12 is, for example, the R & C method (manufactured by Okumura Corporation) in the same manner as the rectangular pipe 19a and the corner rectangular pipe 19b constituting the vertical pipe row 11. The well-known rectangular pipe used for can be used preferably. In addition, the rectangular pipe 19c can be easily joined and integrated in a state of being connected to the other rectangular pipe 19c and the corner rectangular pipe 19b, for example, by connecting via a joint rib or the like provided protruding from the outer peripheral surface. it can.

  In this embodiment, as shown in FIGS. 5A and 5B, the upper surfaces of the rectangular pipes 19b and the rectangular pipes 19c constituting the horizontal pipe row 12 are cut so as to cover the upper surfaces. A plate 22 is placed along the longitudinal direction of each rectangular pipe 19b, 19c. Here, as the edge cutting plate 22, for example, a known friction cut plate used in the above-mentioned R & C method can be preferably used. Further, the edge cutting plate 22 can be easily joined and integrated, for example, by being connected in close contact via a joint plate provided along the side edge.

  In the present embodiment, the edge cutting plate 22 can be attached to the side surfaces of the rectangular pipes 19a constituting the longitudinal pipe row 11 including the corner rectangular pipes 19b so as to cover the side surfaces. The edge cutting plate 22 is attached so as to cover these side surfaces, and when the ready-made box structure 10 is pushed out by replacing the vertical pipe row 11 and the horizontal pipe row 12, Using the side surface as a guide surface, the box structure 10 can be smoothly pushed out with the surrounding earth and sand 20 and the foundation ground 14 being cut off.

  In the step of attaching the beam receiving member 17 to be interposed between the bridge beam 16 and the rectangular rectangular pipe 19b and / or the rectangular pipe 19c on the supporting base 21, as shown in FIGS. As the receiving member 17, for example, an H-shaped steel or an I-shaped steel is installed on the upper surface covered with the edge cut plate 22 of the corner rectangular pipe 19 b or the rectangular pipe 19 c so as to intersect the bridge girder 16 substantially perpendicularly. In order to install the girder member 17, for example, the bridge girder 16 is jacked up by supporting it on the upper surface of the corner rectangular pipe 19b or the rectangular pipe 19c, and the top end surface of the girder member 17 is the height of the abutment 15a of the pier 15a. After the height is adjusted so as to be, the bridge girder 16 is placed on the top end surface of the girder receiving member 17.

  In the present embodiment, the girder member 17 is interposed between the bottom surface of the girder member 17 and the edge cutting plate 22 placed on the top surface of the corner rectangular pipe 19b or the rectangular pipe 19c, and has a rotational movement function. For example, a conveyor chain is provided as the slide member 27. By providing the slide member 27, the girder member 17 is installed so as to be slidable with respect to the edge cutting plate 22 placed on the upper surface of the corner rectangular pipe 19b or the rectangular pipe 19c. As a result, when the ready-made box structure 10 is pushed out to replace the vertical pipe row 11 and the horizontal pipe row 12 while leaving the edge cut plate 22 while the lower surface of the edge cut plate 22 is used as a guide surface, Even if the edge-cutting plate 22 tries to move due to the impact, friction or the like, it is possible to absorb the displacement due to such movement and maintain the position of the bridge girder 16.

  Furthermore, in this embodiment, as shown in FIG. 4, it is erected from the ground of the portion adjacent to the retaining wall 23a outside the side shaft 18 below the bridge girder 18 and extends upward to the retaining wall 23a. A plurality of girder columns 28 arranged to face the installation portion 24 are provided. Further, a girder beam 29 is attached between the upper end of the girder support column 28 and the upper end of the extended portion 24 of the retaining wall 23a. An auxiliary girder receiving member 30 made of, for example, an H-shaped steel or an I-shaped steel intersects the girder beam 29 and the bridge girder 11 substantially vertically on the upper surface of the girder beam 29. Installed. The auxiliary girder receiving member 30 can hold the bridge girder 16 in a more stable state by supporting the bridge girder 16 together with the girder receiving member 17 installed on the upper surface of the rectangular rectangular pipe 19b or the rectangular pipe 19c. become.

  When one end of the bridge girder 16 is supported from the bridge pier 15 by the girder support member 17 so that it can be refilled, the rectangular pipe 19c connected in a lateral direction from the rectangular pipe 19c on the support base 21 is installed across the pier 15 I do. In this embodiment, prior to the work of installing the rectangular pipe 19c across the pier 15, as shown in FIGS. 6 and 7, for example, the ground improvement 31 is applied to the ground around the work area, and the pier 15 is The start base 32 and the arrival base 33 are formed by digging down one side and the other side in the transverse direction. In addition, various work facilities are installed in the departure base 32 and the arrival base 33.

  That is, for example, by performing the ground improvement 31 using various known improvement methods such as a chemical solution injection method, the ground around the work area is stabilized and the earth retaining steel sheet pile 34 is placed so as to surround the work area. And the back embankment 35 for obtaining reaction force is constructed. Further, for example, the start base 32 and the arrival base 33 are formed by digging down both sides sandwiching the pier 15 while placing an earth anchor (see FIG. 6).

  Furthermore, as various facilities for work, a rectangular pipe starting stand 36, a rectangular pipe propulsion machine 37, etc. are installed in the arrival base 33, and a rectangular pipe removing stand 38, a reaction wall 39, etc. are installed in the starting base 32. Is installed. Moreover, the box structure 10 is built in the starting base 32 (refer FIG. 7). Note that these operations can be performed in parallel with the above-described steps.

  In the step of connecting the rectangular pipe 19c on the support base 21 in the horizontal direction and installing the rectangular pipe 19c constituting the horizontal pipe row 12 across the bridge pier 15, for example, the above-mentioned R & C In the same manner as the construction method, as shown in FIG. 7, a rectangular pipe 19c on which the edge cutting plate 22 is placed on a top surface of a rectangular pipe starter base 36 installed on the arrival base 33 is added to the rectangular pipe 19c on the upper surface. It pushes toward the pier 15 and the start base 32 by the pipe propulsion machine 37. Further, from the work opening at the tip of the rectangular pipe 19c, the pier 15 and the foundation ground 14 are crushed or excavated using, for example, a breaker, chisel, scoop or the like, and the rectangular pipe 19c is propelled to reach the start base 32. The rectangular pipes 19c are installed in, for example, three rows across the pier 15 (see FIG. 4).

  In this embodiment, when the rectangular pipe 19c of the part crossing the pier 15 is installed, as shown in FIG. 1, it arrange | positions in the position of the top part 10b of the box structure 10, and comprises the horizontal pipe row | line | column 12. The remaining rectangular pipes 19c, the rectangular pipes 19a and the corner rectangular pipes 19b constituting the longitudinal pipe row 11 disposed at the position of the side wall 10a opposite to the lower part of the bridge girder 16 of the box structure 10; Is installed in the foundation ground 14 below the rail 13. These rectangular pipes 19a, 19b, and 19c are installed in the same manner as in the above-described R & C method, for example, from the rectangular pipe starter base 36 installed in the arrival base 33 as shown in FIG. 40, the rectangular pipes 19a, 19b, 19c are pushed out toward the starting base 32 by the rectangular pipe propulsion unit 37, and the rectangular pipe 19c is propelled while excavating the foundation ground 14 from the work opening at the tip to start the operation. This is done by reaching the base 32.

  As described above, in the region including the lower portion of the bridge girder 16 supported by the bridge pier 15, the longitudinal pipe row 11 and the transverse pipe along the side wall part 10 a and the top part 10 b on both sides of the box structure 10. When the row 12 is installed (see FIG. 1), in this embodiment, for example, the box structure 10 built at the start base 32 is pushed out toward the arrival base 33, as in the above-described R & C method. Thus, the box structure 10 is constructed as an underground structure for a road tunnel by replacing the vertical pipe line 11 and the horizontal pipe line 12.

  In order to replace the box structure 10 built at the departure base 32 with the longitudinal pipe row 11 and the transverse pipe row 12, the rectangular pipe removal stand 38 is removed at the departure base 32 as shown in FIG. At the same time, the blade edge 41 and the tip jack 42 are assembled in front of the built-in box structure 10. Further, a reaction force equipment 43 is installed behind the box structure 10 by a push jack, a well girder, an adjustment frame or the like. Furthermore, in the arrival base 33, the rectangular pipe starting stand 36 is rearranged as a rectangular pipe removing stand 38.

  Next, the end face 10d of the box structure 10 was brought into contact with the end faces of the vertical pipe row 11 and the horizontal pipe row 12 via the tip jack 42, and placed on the upper surface of the horizontal pipe row 12. The edge part of the edge cutting board 22 is fixed to a fixed location. In this state, as shown in FIG. 8, the earth and sand of the foundation ground 14 below the rail 13 including the pier 15 is removed through the hollow interior of the box structure 10 and placed on the upper surface of the lateral pipe row 12. Using the lower surface of the placed edge cutting plate 22 as a guide surface, the box structure 10 is pushed forward by driving a main push jack or the like to advance toward the arrival base 33.

  Here, since the rectangular pipes 19a, 19b, and 19c constituting the vertical pipe row 11 and the horizontal pipe row 12 are pushed out to the arrival base 33 by the advancement of the box structure 10, the pushed rectangular pipe 19a. , 19b, 19c are collected for each unit pipe 40, for example.

  As shown in FIG. 9 and FIG. 10, as shown in FIG. 9 and FIG. 10, a cross girder or the like is additionally arranged in the reaction equipment 43 at the departure base 32 and the rectangular pipes 19 a, 19 b, 19 c pushed out at the arrival base 33 are collected. If the box structure 10 is continuously advanced until the tip of the structure 10 reaches the arrival base 33, the box structure 10 is replaced with the vertical pipe row 11 and the horizontal pipe row 12 so that the road structure 10 As an underground structure for the tunnel, it is constructed in a region including the lower part of the bridge girder 16.

  When the tip of the box structure 10 reaches the arrival base 33, for example, back filling is injected into the ground around the box structure 10, and the blade 41, the reaction force equipment 43, the rectangular pipe removal stand 38, the reaction force The wall 39 and the like are dismantled and the installation work of the box structure 10 is completed. When the box structure 10 is installed, the earth retaining steel sheet pile 34, the girder column 28, the girder beam 29, and the like are removed to perform the site restoration work. Further, for example, a final work such as concrete filling and placing is performed on the lower portion of the bridge girder 16 supported by the girder receiving member 17 from the upper surface of the corner rectangular pipe 19b or the rectangular pipe 19c to complete the entire construction.

  And according to the construction method of box structure 10 of this embodiment, as mentioned above, the process of constructing side shaft 18 and rectangular pipe 19a are piled up from the inside of this side shaft 18 and a longitudinal pipe line 11, the side shaft 18 is filled with earth and sand 20 and backfilled, and a support base 21 is formed in a portion between the longitudinal pipe row 11 and the pier 15, and the longitudinal pipe row 11 A step of installing the rectangular pipe 19c constituting the horizontal pipe row 12 on the support base 21 in a lateral direction from the uppermost corner rectangular pipe 19b, and the bridge girder 16, the corner rectangular pipe 19b and the support The step of supporting the bridge girder 16 by the girder receiving member 17 interposed between the rectangular pipe 19c on the base 21 and the rectangular pipe 19c constituting the lateral pipe row 12 are installed across the pier 15. When the box structure 10 is constructed across the pier in the region including the lower portion of the bridge girder 16 supported by the pier 15, the load from the bridge girder 16 is strong and stable. It is possible to easily replace the box structure 10 with the vertical pipe row 11 and the horizontal pipe row 12 while supporting in the state.

  The present invention is not limited to the above-described embodiments, and various modifications can be made. For example, the girder member is not necessarily installed so as to be slidable with respect to the edge cutting plate placed on the top surface of the rectangular rectangular pipe or the rectangular pipe on the support base. In addition, it is not always necessary to install an auxiliary girder member by installing a girder column or girder beam below the bridge girder. Furthermore, the present invention is not limited to the case where an underground structure for a road tunnel is formed below a rail, and various boxes having a rectangular cross section in a region including a lower portion of a bridge girder supported by a bridge pier. Can be employed to build structures.

It is sectional drawing explaining the construction method of the box structure which concerns on preferable one Embodiment of this invention. It is sectional drawing along AA of FIG. 1 explaining the operation | work process of the construction method of the box structure which concerns on preferable one Embodiment of this invention. It is principal part sectional drawing explaining the operation | work process of the construction method of the box structure which concerns on preferable one Embodiment of this invention. It is principal part sectional drawing explaining the operation | work process of the construction method of the box structure which concerns on preferable one Embodiment of this invention. (A) is an expanded sectional view explaining the state which supports a bridge girder with a girder support member, (b) is a fragmentary perspective view explaining the state which installed the girder member so that sliding movement was possible with respect to the edge cutting board. . (A) is sectional drawing in alignment with AA of FIG. 1, explaining the operation | work process of the construction method of the box structure which concerns on preferable one Embodiment of this invention, (b) is A of (b). It is principal part sectional drawing along -A. It is sectional drawing along AA of FIG. 1 explaining the operation | work process of the construction method of the box structure which concerns on preferable one Embodiment of this invention. It is sectional drawing along AA of FIG. 1 explaining the operation | work process of the construction method of the box structure which concerns on preferable one Embodiment of this invention. It is sectional drawing along AA of FIG. 1 explaining the operation | work process of the construction method of the box structure which concerns on preferable one Embodiment of this invention. It is sectional drawing along AA of FIG. 1 explaining the operation | work process of the construction method of the box structure which concerns on preferable one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Box structure 10a Side wall part 10b of box structure Top part 11 of box structure Vertical pipe row 12 Horizontal pipe row 13 Rail 14 Base ground 15 Bridge pier 16 Bridge girder 17 Girder member 18 Side shaft 19a Rectangular pipe 19b composing the vertical pipe row Rectangular pipe 19c Rectangular pipe 20c forming the horizontal pipe row Earth and sand 21 Support base 22 of the horizontal pipe row Edge cut plate 23a Earth retaining wall 23b outside the side shaft Retaining wall 24 on the inner side of the shaft 24 extending upwardly on the retaining wall on the outer side of the side shaft 25 slide member 30 auxiliary girder receiving member 32 departure base 33 arrival base 41 blade edge 43 reaction force equipment

Claims (3)

A box structure construction method for building a hollow box structure having a rectangular cross section across the pier in a region including a lower portion of a bridge girder supported by the pier,
A step of excavating a portion of the ground where the side wall portion of the box structure below the bridge girder is disposed to build a side shaft,
Along with the position where the side wall portion of the box structure is provided, the vertical pipe row is installed by stacking rectangular pipes laid horizontally from the side shaft to the height position of the top part of the box structure And a process of
Backfilling the side shafts and filling the portion between the longitudinal pipe row and the pier with earth and sand to form a support base for the lateral pipe row;
A horizontally disposed rectangular pipe that is arranged at the uppermost stage of the longitudinal pipe row and is continuously provided laterally from a corner rectangular pipe on which an edge cutting plate is placed on the upper surface, and constitutes the transverse pipe row, A step of installing on the support base in a state in which an edge cutting plate is placed on the upper surface along the height position where the top part of the box structure is provided;
Attaching the girder member by interposing between the bridge girder and the rectangular rectangular pipe and / or the rectangular pipe on the support base, thereby supporting the bridge girder by the girder member;
Installing the rectangular pipes that form the lateral pipe row in a lateral direction from the rectangular pipes on the support base, while traversing the bridge pier and having an edge-cutting plate placed on the upper surface. Including
When the vertical pipe row and the horizontal pipe row are installed along the side wall portion and the top plate portion on both sides of the box structure, the ready-made one provided on one side portion in the transverse direction across the bridge pier. After the end face of the box structure is brought into direct or indirect contact with the vertical pipe row and the horizontal pipe row, the ground soil including the bridge pier is removed through the hollow interior of the box structure. However, the frame structure is pushed out toward the other side in the transverse direction across the bridge pier, and the edge cutting plate placed on the upper surface of the rectangular pipe of the lateral pipe row including the corner rectangular pipe By replacing the box structure with the vertical pipe row and the horizontal pipe row while leaving the edge cutting plate as a lower guide surface, the box structure includes the lower part of the bridge girder. Build across the pier in the area How to build a body structure.   In the step of supporting the bridge girder by the girder member, the girder member is slidable relative to the edge cutting plate placed on the upper surface of the rectangular pipe and / or the rectangular pipe on the support base. The method for constructing a box structure according to claim 1, which is installed in the box.   Including a step of extending upward the retaining wall outside the side shaft to a height position where the top portion of the box structure is provided, and backfilling the side shaft and the longitudinal pipe row 2. The box structure according to claim 1, wherein in the step of filling the portion between the pier with earth and sand, the portion between the portion extending upward of the retaining wall and the longitudinal pipe row is also filled with earth and sand. How to build things.

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