Method for demolishing and removing concrete structures at the bottom corners

Abstract

To provide a bottom-corner concrete structure decomposition-removal method that makes a bottom-corner concrete structure, which is continuously arranged at the side edge part of a pavement body formed at the bottom of a tunnel, not affect the use of existing facility structures.SOLUTION: A bottom-corner concrete structure decomposition-removal method comprises a hole-linked groove drilling process to form a vertical-direction hole-linked groove 41, a pressure-applying hole drilling process to form a pressure-applying hole 43 in which a power jack 45 is mounted for pressing, a disconnect process in which a concrete block 44 is disconnected from a foundation part 52 including a sidewall structure 51a and a base concrete layer (passage base part) 22a, a pull-out process to pull out the concrete block 44, and a lift-up removal process in which the concrete block 44 is lifted up and removed.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present invention relates to a method for disassembling and removing a bottom corner concrete structure, and particularly to a method for disassembling and removing a bottom corner concrete structure that is provided along the side edge portion of a pavement formed at the bottom of a mountain tunnel and is adopted when disassembling, removing, and renovating the bottom corner concrete structure.

Background Art

[0002] For example, in a mountain tunnel for a road, outside the side of a pavement formed with a predetermined thickness at the bottom of the tunnel, there may be a passage structure for inspection work by a supervisor or a waterway structure, etc., as a bottom concrete structure whose upper surface is at the same level as the pavement surface of the pavement, and it may be formed of concrete along the side edge portion of the pavement. In construction work for renovating these bottom concrete structures together with the pavement or removing them together with the pavement and then constructing a new invert structure at the bottom of the tunnel, for example, it may be necessary to first remove the portion of the bottom concrete structure while continuing to use the pavement.

[0003] For example, in a mountain tunnel for a road, to remove a bottom concrete structure formed outside along the side edge portion of an existing pavement while continuing to use the pavement, preferably, a method of dividing the bottom concrete structure into a plurality of blocks and lifting them upward for removal can be considered (see, for example, Patent Document 1).

[0004] In the method for removing a concrete structure described in Patent Document 1, for the purpose of dividing a concrete block to be disassembled into a size (weight) that can be lifted and removed by a crane while peeling it from the ground of the foundation part, a mounting hole for a hydraulic jack is formed at a predetermined position of the concrete block using a core boring machine, and a hydraulic jack is set in the formed mounting hole and a pressure is applied to divide the concrete block to be disassembled.

Prior Art Documents

[0005] [Patent Document 1] Japanese Patent Publication No. 2003-105980 [Overview of the project] [Problems that the invention aims to solve]

[0006] The concrete structure removal method described in Patent Document 1 is feasible when there is a free surface around or to the side of the concrete block to be demolished that allows for the lateral movement of divided blocks, as well as a workspace that enables various operations. However, if, for example, the bottom concrete structure is formed in continuous with the existing pavement and work can only be done from the upper surfaces of these structures, it is difficult to divide the bottom concrete structure into multiple blocks or to remove the divided blocks by lifting them up.

[0007] Furthermore, for example, if existing equipment structures such as piping systems are installed along the length of the tunnel on the side walls of a concrete tunnel lining that covers the inner circumference of a mountain tunnel, then attempting to remove the bottom concrete structure at the joint corner between the tunnel lining side wall structure and the foundation, which is formed in the area below, becomes difficult because the existing equipment structures get in the way. For this reason, it is desirable to be able to smoothly remove the bottom concrete structure at the joint corner formed in the area below the existing equipment structures without affecting the use of the existing equipment structures.

[0008] The present invention aims to provide a method for removing a bottom concrete structure in a mountain tunnel, which is formed continuously with the pavement along the side edge portion of the pavement formed at the bottom of the tunnel, and which can be removed by dividing it into multiple blocks without affecting the use of existing equipment structures. [Means for solving the problem]

[0009] The present invention relates to a method for demolishing and removing a concrete bottom corner concrete structure, which is formed by extending along the length of the side wall structure in a separate process from the side wall structure and the foundation portion, at the joint corner portion between the side wall structure and the foundation portion in the lower region of an existing equipment structure supported by a side wall structure and extending along the length of the side wall structure, while avoiding contact with the existing equipment structure. The method is employed when demolishing and removing a concrete bottom corner concrete structure, which is formed by extending along the length of the side wall structure in a separate process from the side wall structure and the foundation portion, in a portion away from the portion directly below the existing equipment structure, with the side end face of the bottom corner concrete structure opposite to the surface in contact with the side wall structure being open as a working end face, and the work is carried out from the side of the working end face, on a removal construction span set as a region having a predetermined extension in the length of the bottom corner concrete structure, and a plurality of core holes are drilled in the bottom corner concrete structure at one end in the length of the bottom corner concrete structure on the working end face of the removal construction span region. The process involves: a connecting hole groove drilling step, in which a connecting hole groove is formed by drilling a longitudinal hole from the top surface of the concrete structure to the foundation portion, and drilling a longitudinal hole toward the side wall structure using a core drilling device; a pressure hole drilling step, in which one or more core holes are drilled longitudinally toward the side wall structure at the other end of the bottom corner concrete structure in the length direction of the working end face of the area of ​​the removal construction span, using a core drilling device to form pressure holes for which a power jack is attached and pressed; and a pressure hole drilling step, in which a packing device is inserted into the formed pressure hole. The process involves attaching a work jack and applying pressure toward the longitudinal connecting hole groove to push out the concrete block made of the bottom corner concrete structure in the area of ​​the removal construction span, thereby separating the side portion of the concrete block from the side wall structure and separating the bottom portion from the foundation; pulling out the separated concrete block to a position away from the side wall structure, avoiding the existing equipment structure; and thereafter, the pulled-out concrete block,The above objective is achieved by providing a method for dismantling and removing a concrete structure at the bottom corner, which includes a lifting and removal process in which the structure is removed by rigging and lifting.

[0010] Furthermore, in the demolition and removal method for the bottom corner concrete structure of the present invention, it is preferable that in the connecting hole groove drilling step and the pressurizing hole drilling step, a core drilling device is used to drill to a depth that does not reach the side wall structure, thereby forming the vertical connecting hole groove and the pressurizing hole.

[0011] Furthermore, in the method for dismantling and removing the bottom corner concrete structure of the present invention, it is preferable that the side wall structure is a side wall structure made of a concrete tunnel lining that covers the inner circumferential surface of a mountain tunnel, the existing equipment structure that extends along the length of the side wall structure is a piping equipment structure, and the concrete bottom corner structure formed at the joint corner between the side wall structure and the foundation is a corner structure made of a bottom concrete structure that is provided along the side edge of the pavement formed at the bottom of the tunnel. [Effects of the Invention]

[0012] According to the method for dismantling and removing a bottom corner concrete structure of the present invention, in a mountain tunnel, a bottom corner concrete structure that is formed continuously with the pavement along the side edge portion of the pavement formed at the bottom of the tunnel can be divided into multiple blocks and removed without affecting the use of existing equipment structures. [Brief explanation of the drawing]

[0013] [Figure 1] This is a cross-sectional view of a key part illustrating a bottom corner concrete structure that is removed by a method for dismantling and removing a bottom corner concrete structure according to a preferred embodiment of the present invention. [Figure 2] (a) and (b) are cross-sectional views of the main parts illustrating the cutter cutting process. [Figure 3]This is a cross-sectional view illustrating the main part of the transverse core drilling process. [Figure 4] This is a schematic plan view illustrating the transverse core drilling process and the longitudinal core drilling process. [Figure 5] This is a cross-sectional view of the main part illustrating the lifting and removal process. [Figure 6] This is a perspective view illustrating the lifting and removal process. [Figure 7] This is a cross-sectional view illustrating the drilling process for the demolition and removal method of the concrete structure at the bottom corner. [Figure 8] This is a schematic front view illustrating the edge-cutting process in the demolition and removal method for concrete structures at the bottom corners. [Figure 9] This is a cross-sectional view of a key part illustrating the extraction process for the demolition and removal method of the concrete structure at the bottom corner. [Figure 10] This is a side view illustrating a known cutter machine. [Figure 11] This is an explanatory diagram of the portion that remains uncut during the cutter cutting process. [Figure 12] This is a side view illustrating a known core drilling apparatus. [Modes for carrying out the invention]

[0014] The method for removing the bottom concrete structure according to a preferred embodiment of the present invention is, for example, in a mountain tunnel 50 for a road tunnel having a horseshoe-shaped cross-sectional shape, as shown in FIG. 1, the pavement 25 formed at the bottom of the tunnel 50 is removed together with the bottom concrete structure 20 provided along the side edge portion thereof. For example, in the construction of newly adding a lining for the bottom invert portion between the lower ends of the side wall portions 51a on both sides of the tunnel lining 51 made of concrete covering the inner peripheral surface of the tunnel 50, as a removal method for preferentially removing the bottom concrete structure 20 while appropriately restricting traffic on the road by the pavement 25, preferably while continuing to use the pavement 25. In the method for removing the bottom concrete structure of the present embodiment, the bottom concrete structure 20 continuously formed with the pavement 25 is divided into a plurality of concrete blocks by working from the upper surface portions thereof along the side edge portion of the pavement 25 formed at the bottom of the tunnel 50, so that it can be removed more smoothly.

[0015] The method for removing the bottom concrete structure in this embodiment is a removal method used when removing and repairing a bottom concrete structure 20 provided along the side edge portion of the pavement body 25 formed at the bottom of a mountain tunnel 50. As shown in Figure 1, the bottom concrete structure 20 is formed interposed between the lower end inner surface portion 51b of the tunnel lining body 51 that covers the inner surface of the mountain tunnel 50 and the side end surface portion 25a of the pavement body 25. The removal method for the bottom concrete structure in this embodiment, as shown in Figures 2(a), (b) to 6, involves a cutter cutting step (see Figures 2(a), (b)) in which two or more rows of cutter grooves 11a, 11b, 11c, including a cutter groove 11a formed at the boundary with the pavement body 25, are extended in the longitudinal direction along the axial direction X of the tunnel 50, and cut into the bottom concrete structure 20 in the area of ​​the removal construction span S having a predetermined extension in the axial direction X of the tunnel 50 (see Figure 4), using a cutter machine 30 (see Figure 10) to form cuts from the upper surface 20a of the bottom concrete structure 20 to a depth reaching the foundation portion 52; and a cutter cutting step (see Figures 2(a), (b)) in which two or more rows of cutter grooves 11a, 11b, 11c, including a cutter groove 11a formed at the boundary with the pavement body 25, are extended in the longitudinal direction along the axial direction X of the tunnel 50, and cut into the bottom concrete structure 20 to a depth reaching the foundation portion 52, at least at both ends in the axial direction X of the tunnel 50 in the area of ​​the removal construction span S, and multiple core drilling holes 12 are made from the upper surface 20a of the bottom concrete structure 20 to the foundation portion 52. The process includes a transverse core drilling step (see Figures 3 and 4) in which a core drilling device 31 (see Figure 12) is used to drill to a certain depth to form a transverse connecting hole groove 13; an isolation step (see Figure 6) in which a power jack (not shown) is installed inside the transverse connecting hole groove 13 formed at one end of the tunnel 50 in the axial direction X in the area of ​​the removal construction span S, and a pressing force in the axial direction X of the tunnel 50 is applied to isolate the bottom surface of the concrete block 14 (see Figure 6) made of the bottom concrete structure in the area surrounded by a pair of left and right cutter grooves 11a, 11b, 11c and a pair of front and rear transverse connecting hole grooves 13 from the foundation portion 52; and a lifting and removal step (see Figures 5 and 6) in which the concrete block 14, whose bottom surface has been isolated from the foundation portion 52, is removed by lifting it with a rig, preferably with a wire member 34.

[0016] In this embodiment, the pavement 25 formed at the bottom of the tunnel 50 is a pavement structure used as a roadway, which is preferably formed by spreading and compacting on the roadbed that constitutes the foundation part 52, for example, a roadbed layer with a thickness of about 300 mm, and an asphalt layer with a thickness of about 150 mm, which is laid and compacted on the roadbed layer, and has a thickness of about 450 mm. On the side of the pavement 25, between the inner peripheral surface 51b of the lower end part by the side wall part 51a of the tunnel lining 51, a bottom concrete structure 20 is formed along the side edge part of the pavement 25 in a process separate from the construction of the tunnel lining 51 and the pavement 25, extending in the axial direction X of the tunnel 50, and is formed continuously with the side wall part 51a of the tunnel lining 51 and the pavement 25. The bottom concrete structure 20 is composed of a water channel part 21 on the pavement 25 side, which is formed by connecting a plurality of precast concrete water channel blocks in the axial direction X of the tunnel 50, and a passage base part 22, which is formed by placing in-situ concrete between the inner peripheral surface 51b of the lower end part by the side wall part 51a of the tunnel lining 51 and the water channel part 21.

[0017] The water channel part 21 is formed to have a thickness (height) of about 450 mm from the base concrete layer 21a by placing and integrating a plurality of water channel blocks on the upper surface of the base concrete layer 21a formed, for example, with a thickness of about 100 mm on the foundation part 52 including the foundation ground, sand layer, and crushed stone layer, in a state of being connected in the axial direction X of the tunnel 50. The passage base part 22 is formed to have a thickness (height) of about 350 mm from the base concrete layer 22a by placing in-situ concrete on the base concrete layer 22a with a thickness of about 100 mm formed on the foundation part 52 including the foundation ground, sand layer, and crushed stone layer. Further, the water channel part 21 and the passage base part 22 that constitute the bottom concrete structure 20 together with the base concrete layers 21a and 22a are preferably formed such that their upper surface parts are at the same level as the pavement surface of the pavement 25. On the upper surface part of the passage base part 22, on the part on the water channel part 21 side, a drainage concave groove 22b is formed by punching out in the axial direction X of the tunnel 50.

[0018] Furthermore, in this embodiment, support bracket members 53, for example, made of angle steel, are attached to the side wall portion 51a of the tunnel lining 51 that covers the inner circumferential surface of the tunnel 50 at a predetermined height position above the bottom concrete structure 20 on the inner surface thereof, so as to protrude inward. Multiple support bracket members 53 are attached at predetermined intervals in the axial direction X of the tunnel 50. The piping equipment structure 54 is provided extending in the axial direction X of the tunnel 50, which is the length direction of the side wall portion 51a, supported by these multiple support bracket members 53.

[0019] As a result, in this embodiment, when removing the concrete portion at the bottom corner (bottom corner concrete structure) 40 (see Figure 7) (see Figure 7) located at the joint corner between the side wall portion (side wall structure) 51a made of the tunnel lining 51 and the foundation portion 52 of the passage base portion 22, which is formed in the area below the existing equipment structure, the piping equipment structure 54, it is considered that the existing piping equipment structure 54 will be an obstacle, making it difficult to remove. In this embodiment, by implementing the dismantling and removal method for the bottom corner concrete structure described later, the bottom corner concrete structure 40 at the joint corner formed in the area below the existing equipment structure can be smoothly removed without affecting the use of the existing piping equipment structure 54.

[0020] In this embodiment, the cutter cutting step in the method for removing the bottom concrete structure can be carried out using a known cutter device, preferably a paving cutter as shown in Figure 10, which is capable of forming cutting grooves to a depth of, for example, 500 to 600 mm. In the cutter cutting step, as shown in Figures 2(a), (b) and 4, cutter grooves 11a, 11b, and 11c can be formed using the cutter machine 30 from one end to the other of a predetermined removal construction span S having a predetermined construction length of, for example, several tens of meters in the longitudinal direction, which is the axial direction X of the tunnel 50, with a depth of, for example, 500 to 600 mm, from the upper surface 20a of the bottom concrete structure 20 to the foundation portion 52. In this embodiment, the cutter grooves 11a, 11b, and 11c formed in the bottom concrete structure 20 are formed as two or more rows of cutter grooves 11a, 11b, and 11c, including a cutter groove 11a formed at the boundary with the pavement body 25. These are formed as three rows of cutter grooves 11a, 11b, and 11c: a cutter groove 11a formed in the water channel section 21 close to the boundary with the pavement body 25 at the boundary between the pavement body 25 and the water channel section 21; a cutter groove 11b formed in the water channel section 21 close to the passage base section 22 at the boundary between the passage base section 22 and the water channel section 21; and a cutter groove 11c formed in the central part of the passage base section 22, away from the part directly below the existing equipment structure. By forming the cutter groove 11a at the boundary with the pavement body 25 on the side of the water channel section 21 close to the boundary, it becomes possible to effectively avoid disturbing, for example, the side end face 25a of the pavement body 25 by the cutter groove 11a during cutting.

[0021] Here, since the cutter blade 30a of the cutter machine 30 has a disc shape, if cutting by the cutter machine 30 is stopped before the adjacent removal construction span S', for example, so that the cutter groove 11c in the central part of the passage base 22 does not cut into the adjacent removal construction span S' at both ends of the set removal construction span S, then in the area of ​​the removal construction span S before the adjacent removal construction span S', as shown in Figure 11, the cutter groove 11c will not reach from the upper surface 20a of the bottom concrete structure 20 to the foundation part 52, resulting in an uncut portion (see the shaded area in Figure 11). In such a case, in this embodiment, preferably, by performing a longitudinal core drilling process described later on the cutter groove 11c formed in the central part of the passage base 22, it becomes possible to form a dividing groove that reaches the foundation part 52, including the foundation ground, sand layer, and crushed stone layer below the base concrete layer 22a of the passage base 22, even in the area before the adjacent removal span S'.

[0022] Furthermore, by, for example, using the cutter machine 30 to reach the area of ​​the adjacent demolition span S', and preferably continuing to cut the cutter groove 11c for the required length, exceeding the radius of the cutter blade, it becomes possible to form a cutter groove 11c that reaches the foundation portion 52 below the base concrete layer 22a in the area of ​​the demolition span S in front of the adjacent demolition span S'.

[0023] In the method for removing the bottom concrete structure of this embodiment, the transverse core drilling step can be carried out using a known core drilling machine, preferably as shown in Figure 12, which is known as a core drilling machine and capable of drilling cores with an inner diameter of approximately 100 to 200 mm. In the transverse core drilling step, as shown in Figures 3 and 4, a cutter machine 30 can be used to form multiple core holes 12 from the upper surface 20a of the bottom concrete structure 20 to a depth reaching the foundation portion 52, which includes the foundation ground, sand layer, and crushed stone layer, at least one end and the other end of a predetermined removal construction span S having a set construction length. In this embodiment, the core holes 12 can be formed in a total of six locations in the transverse direction Y of the tunnel 50, with some parts overlapping and connected together. For example, three holes can be formed between the cutter groove 11c in the central part of the passage base 22 and the boundary line between the waterway 21 and the passage base 22, and three holes can be formed between the boundary line between the waterway 21 and the passage base 22 and the boundary line between the waterway 21 and the pavement 25. This makes it possible to form a transverse connecting hole groove 13 consisting of six core holes 12 that are continuous in the transverse direction Y of the tunnel 50 between the cutter groove 11a at the boundary with the pavement 25 and the cutter groove 11c in the central part of the passage base 22.

[0024] The transverse connecting groove 13 does not necessarily need to be formed continuously between the cutter groove 11a at the boundary between the pavement body 25 and the waterway section 21 and the cutter groove 11b at the boundary between the passage base section 22 and the waterway section 21, and between the cutter groove 11b at the boundary between the passage base section 22 and the waterway section 21 and the cutter groove 11c in the central part of the passage base section 22, at both ends of the removal construction span S. It is sufficient if it is formed continuously between these at either one end of the removal construction span S. In other words, when a power jack (not shown) is installed inside the transverse connecting groove 13 in the bottom edge cutting process and a pressing force is applied in the axial direction X of the tunnel 50, it is sufficient if a free surface is secured only in the transverse connecting groove 13 on the opposite side of the transverse connecting groove 13 from which the power jack is installed, for pushing out and moving the concrete block 14.

[0025] Furthermore, in this embodiment, the pre-set demolition construction span S has a considerable construction length of, for example, several tens of meters in the axial direction X of the tunnel 50. For this reason, it is preferable to form a transverse connecting hole groove 13 in the intermediate portion of the tunnel 50 in the axial direction X by an intermediate region core drilling process, between the transverse connecting hole grooves 13 formed at both ends of the tunnel 50 in the axial direction X of the tunnel 50, by drilling core holes 12 using a core drilling device 31. The transverse connecting hole grooves 13 formed by the intermediate region core drilling process can be formed in one or more locations in the region between the transverse connecting hole grooves 13 at both ends of the demolition construction span S, at a pitch of, for example, about 2 meters in the axial direction X of the tunnel 50, using the same method as the transverse core drilling process that forms these transverse connecting hole grooves 13. The transverse connecting grooves 13 formed by the intermediate region core drilling process do not necessarily need to be formed continuously between the cutter groove 11a at the boundary between the pavement body 25 and the channel section 21 and the cutter groove 11b at the boundary between the walkway base section 22 and the channel section 21, and between the cutter groove 11b at the boundary between the walkway base section 22 and the channel section 21 and the cutter groove 11c in the central part of the walkway base section 22. There may be portions between these areas where transverse connecting grooves 13 are not formed.

[0026] This allows for smooth edge separation by installing a power jack (not shown) inside the transverse connecting hole groove 13 and applying a pressing force in the axial direction X of the tunnel 50, thereby pushing out and moving the concrete blocks 14 in increments of, for example, 2m in length.

[0027] Furthermore, in this embodiment, as described above, when forming the cutter groove 11c in the central portion of the passage base portion 22, it is preferable to further include a longitudinal core drilling step in which, as shown in Figure 4, cutting by the cutter machine 30 is stopped before the adjacent removal construction span S' so as not to cut into the adjacent removal construction span S', and a longitudinal connecting hole groove 16 is formed by drilling a plurality of connecting core holes 15 on the cutter groove 11c in the portion close to these ends, so as to be continuous with the transverse connecting hole groove 13 formed at at least one end (both ends in this embodiment) of the area of ​​the removal construction span S, by overlapping them with the core drilling device 31.

[0028] As a result, at both ends of the set demolition span S, the cutting by the cutter machine 30 is stopped before the adjacent demolition span S' so that the cutter groove 11c does not penetrate into the adjacent demolition span S'. As a result, even if, as shown in Figure 11, the depth of the cutter groove 11c does not reach the foundation portion 52 in the area of ​​the demolition span S before the adjacent demolition span S', leaving an uncut portion, it becomes possible to reliably form a dividing groove that reaches the foundation portion 52 below the base concrete layer 22a of the passage base portion 22 by forming a longitudinal connecting hole groove 16 in the area before the adjacent demolition span S' through a longitudinal core drilling process.

[0029] In the removal method for the bottom concrete structure of this embodiment, the edge cutting step can preferably be carried out using a power jack, which is a known hydraulic jack that operates by hydraulics. The bottom edge cutting step can be carried out by using the transverse connecting groove 13 formed in the removal construction span S as a free surface, and by attaching a power jack (not shown) inside the transverse connecting groove 13 formed in the end or middle portion opposite to the free surface transverse connecting groove 13, and applying a pressing force toward the free surface transverse connecting groove 13 in the axial direction X of the tunnel 50. As a result, in each of the following areas, the portion between the cutter groove 11a at the boundary between the pavement body 25 and the waterway section 21 and the cutter groove 11b at the boundary between the walkway base section 22 and the waterway section 21, and the portion between the cutter groove 11b at the boundary between the walkway base section 22 and the waterway section 21 and the cutter groove 11c in the central part of the walkway base section 22, the bottom concrete structure of the portion surrounded by the left and right pair of cutter grooves 11a, 11b, 11c and the front and rear pair of transverse connecting hole grooves 13 can be easily separated from the foundation section 52 and pushed out to the free surface side as divided concrete blocks 14 (see Figure 6).

[0030] Furthermore, if multiple transverse connecting grooves 13 are formed at intervals of approximately 2m between the transverse connecting grooves 13 formed at both ends of the demolition span S by the intermediate region core drilling process, then by sequentially attaching power jacks (not shown) to the transverse connecting grooves 13 formed by the intermediate region core drilling process on the side closest to the transverse connecting groove 13 at one end that has become a free surface, and applying a pressing force to the transverse connecting groove 13 that has become a free surface, it becomes possible to push out each of the divided concrete blocks 14. In other words, by using the transverse connecting groove 13 that has been pushed out by the power jack as a new free surface, and by attaching a power jack to the next transverse connecting groove 13 and applying a pressing force, it becomes possible to push out the concrete blocks 14 sequentially, separating them from the foundation portion 52.

[0031] The lifting removal process in the method for removing the bottom concrete structure of this embodiment can be carried out using a backhoe 32, which can also be used as a lifting machine, and a dump truck 33, as shown in Figures 5 and 6. In the lifting removal process, for example, a lifting jig is attached to the concrete block 14 via a hole-in anchor, and a wire member 34 is attached to the lifting jig to perform rigging. The block is then lifted by the bucket 32a of the backhoe 32 installed on the upper surface of the pavement 25, and each divided concrete block 14 is loaded onto the bed of the dump truck 33 for transport. The concrete blocks 14 that have been separated from the foundation portion 52 in the separation process can be removed one by one, or multiple concrete blocks 14 can be separated from the foundation portion 52 and then removed together.

[0032] As a result, according to the method for removing the bottom concrete structure of this embodiment, in a mountain tunnel 50, the bottom concrete structure 20, which is formed continuously along the side edge portion of the pavement body 25 formed at the bottom of the tunnel 50, can be easily removed by dividing it into multiple concrete blocks 14 by working from their upper surfaces.

[0033] Furthermore, in this embodiment, once the bottom concrete structure 20 in the portion between the cutter groove 11a at the boundary between the pavement body 25 and the waterway section 21 and the cutter groove 11b at the boundary between the passage base section 22 and the waterway section 21, and the bottom concrete structure 20 in the portion between the cutter groove 11b at the boundary between the passage base section 22 and the waterway section 21 and the cutter groove 11c in the central portion of the passage base section 22, has been removed by the bottom concrete structure removal method described above, the remaining bottom concrete structure 20 between the cutter groove 11c in the central portion of the passage base section 22 and the inner circumferential surface portion 51b of the lower end of the tunnel lining 51 can be easily removed by the bottom corner concrete structure demolition and removal method described below.

[0034] In this embodiment, as described above, a piping equipment structure 54, which is an existing equipment structure, is provided on the side wall portion 51a of the tunnel lining 51 that covers the inner circumferential surface of the tunnel 50 at a predetermined height position above the bottom concrete structure 20, extending in the axial direction X of the tunnel 50, which is the length direction of the side wall portion 51a. Therefore, as shown in Figure 7, when removing the bottom corner concrete structure 40, which is located at the joint corner between the side wall portion (side wall structure) 51a of the tunnel lining 51 and the foundation portion 52 below the base concrete layer 22a of the passage base portion 22, and the bottom concrete structure 20 between the central cutter groove 11c and the inner circumferential surface portion 51b of the lower end of the tunnel lining 51, the piping equipment structure 54 is considered to be an obstacle, making removal difficult. However, by implementing the following method for dismantling and removing the bottom corner concrete structure, it becomes possible to smoothly remove such a bottom corner concrete structure 40 without affecting the use of the existing piping equipment structure 54.

[0035] In other words, in this embodiment, by removing the cutter groove 11a at the boundary between the pavement body 25 and the waterway section 21 and the cutter groove 11b at the boundary between the passage base section 22 and the waterway section 21, and the cutter groove 11b at the boundary between the passage base section 22 and the waterway section 21 and the cutter groove 11c in the central part of the passage base section 22, the side end surface of the bottom corner concrete structure 40 opposite to the surface in contact with the side wall structure 51a, in the portion away from the portion directly below the existing piping equipment structure 54, is left open as a working end surface 40a. The method for dismantling and removing the concrete structure at the bottom corner is carried out from the working end face 40a side, as shown in Figures 7 to 9, over a removal work span S'' of a length of approximately 2m, which is set as a region having a predetermined extension in the axial direction X of the tunnel, which is the longitudinal direction of the side wall structure 51a. The method for dismantling and removing the concrete structure at the bottom corner includes a connecting hole drilling step to form a vertical connecting hole groove 41, a pressurizing hole drilling step to form a pressurizing hole 43 into which a power jack 45 is attached and pressed, an isolation step to isolate the concrete block 44 from the foundation portion 52 below the side wall structure 51a and the base concrete layer 22a, an extraction step to pull out the concrete block 44, and a lifting and removal step to lift and remove the concrete block 44.

[0036] In the connecting hole groove drilling process, multiple core holes 42 are drilled vertically in one end of the bottom corner concrete structure 40 in the longitudinal direction at the working end face 40a of the area to be removed and constructed S'', from the top surface of the bottom corner concrete structure 40 down to the foundation portion 52 below the base concrete layer 22a. A vertical connecting hole groove 41 is then formed by drilling laterally toward the side wall structure 51a using a core drilling device 31 similar to the core drilling machine shown in Figure 12 (see Figures 7 and 8).

[0037] In the pressurized hole drilling process, one or more core holes are drilled laterally toward the side wall structure 51a at the other end in the longitudinal direction of the bottom corner concrete structure 40 at the working end face 40a of the area to be removed and constructed S'' using a core drilling device 31 similar to the core drilling machine shown in Figure 12 above, thereby forming pressurized holes 43 into which a power jack 45 is attached and pressed (see Figures 7 and 8).

[0038] In the separation process, a power jack 45 is installed inside the formed pressure hole 43, and pressing force is applied toward the vertical connecting hole groove 41, thereby pushing out the concrete block 44 by the bottom corner concrete structure 40 in the area of ​​the removal construction span S'', separating the side portion of the concrete block 44 from the side wall structure 51a, and separating the bottom portion from the foundation portion 52 below the base concrete layer 22a (see Figure 8).

[0039] In the extraction process, the concrete blocks 44 that were separated in the separation process are pulled out to a position away from the side wall structure 51a, avoiding the existing equipment structure, the piping equipment structure 54, using, for example, a support frame 46 or chain block 47 installed on the upper surface of the pavement body 25 (see Figure 9).

[0040] In the lifting and removal process, after the concrete block 44 is pulled out in the pulling-out process, the same backhoe 32 or dump truck 33 (see Figures 5 and 6) as described above is used, and the pulled-out concrete block 44 is attached with a rig and lifted up to remove it.

[0041] These measures make it possible to smoothly remove the bottom corner concrete structure 40, which is a concrete structure at the bottom of the joint corner formed in the area below the existing piping structure 54, without affecting its use.

[0042] Furthermore, in this embodiment, in the connecting hole groove drilling process and the pressurized hole drilling process, preferably, core holes 42 and 43 are drilled by the core drilling device 31 to a depth that does not reach the side wall structure 51a, thereby forming the vertical connecting hole groove 41 and the pressurized hole 43. This makes it possible to prevent damage to the existing side wall structure 51a by the side wall portion of the concrete tunnel lining 51 that covers the inner circumferential surface of the tunnel 50.

[0043] It should be noted that the present invention is not limited to the embodiments described above and can be modified in various ways. For example, the method for removing the concrete structure at the bottom of a tunnel according to the present invention does not necessarily include a longitudinal core drilling step in which a longitudinal connecting hole groove is formed by a plurality of connecting core holes, overlapping on a cutter groove, so as to be continuous with a transverse connecting hole groove formed at at least one end of the area of ​​the removal construction span. Furthermore, in addition to being used as a method for removing the concrete structure at the bottom corner of a mountain tunnel for a road tunnel having a hoof-shaped cross-section, the present invention can also be used, for example, as a method for removing concrete or other structures that constitute the floor of a building having walls and floors, when the walls have existing equipment structures. [Explanation of Symbols]

[0044] 10 Mini Bench Cut Tunnel Workstation 11a, 11b, 11c cutter groove 12 core holes 13 Transverse connecting hole groove 14 Concrete blocks 15 core holes 16 Longitudinal connecting grooves 20. Bottom concrete structure 20a Top part 21 Waterway section 21a Base concrete layer (water channel section) 22 Passageway base section 22a Base concrete layer (passageway base section) 22b Drainage groove 25 Pavement 25a Side end face 30 Cutter Machines 30a Cutter Blade 31 Core drilling equipment 32 Backfour 32a Bucket 33 Dump trucks 34 Wire components 40. Concrete structure at the bottom corner 40a Working end surface 41 Longitudinal connecting grooves 42 Core Drilling Holes 43 Pressure holes (core drilling holes) 44 concrete blocks 45 Power Jack 46 Support frame 47 Chain hoist 50 Mountain Tunnels 51 Tunnel lining 51a Side wall part (side wall structure) 51b Lower end inner peripheral surface 52 Basic part 53 Support bracket member 54. Piping and piping structures (existing equipment structures) X tunnel axis Y Tunnel transverse direction S,S',S” Removal and construction span

Claims

1. A method for demolishing and removing a concrete bottom corner concrete structure, which is formed by extending along the length of the side wall structure in a separate process from the side wall structure and the foundation portion, in the lower region of an existing equipment structure that is supported by a side wall structure and extends along the length of the side wall structure, is used when demolishing and removing a concrete bottom corner concrete structure in a way that avoids contact with the existing equipment structure, at the joint corner between the side wall structure and the foundation portion. The side end face of the bottom corner concrete structure, in a portion away from the portion directly beneath the existing equipment structure, opposite to the surface in contact with the side wall structure, is open as a working end face. The removal work is carried out from the side of this working end face, over a demolition span that has been set as an area having a predetermined extension in the longitudinal direction of the bottom corner concrete structure. A connecting hole groove drilling process is performed by drilling a plurality of core holes in the working end face of the area of ​​the removal construction span, at one end in the longitudinal direction of the bottom corner concrete structure, connecting them vertically from the top surface of the bottom corner concrete structure to the foundation portion, and drilling laterally toward the side wall structure with a core drilling device to form a vertical connecting hole groove, A pressure hole drilling step is performed to form pressure holes for which a power jack is attached and pressed, by drilling one or more core holes laterally toward the side wall structure at the other end in the longitudinal direction of the bottom corner concrete structure on the working end face of the area of ​​the removal construction span, using a core drilling device, A power jack is installed inside the formed pressure hole, and pressing force is applied toward the vertical connecting hole groove, thereby pushing out the concrete block made of the bottom corner concrete structure in the area of ​​the removal construction span, thereby separating the side portion of the concrete block from the side wall structure and separating the bottom portion from the foundation portion in a separation process, A pulling step involves pulling the separated concrete block out to a position that avoids the existing equipment structure, on the side away from the side wall structure, A method for dismantling and removing a concrete structure at the bottom corner, which includes a lifting and removal step in which the pulled-out concrete block is removed by lifting it using a rigging system.

2. The method for demolishing and removing a bottom corner concrete structure according to claim 1, wherein in the connecting hole groove drilling step and the pressurizing hole drilling step, a core drilling device is used to drill to a depth that does not reach the side wall structure to form the vertical connecting hole groove and the pressurizing hole.

3. A method for dismantling and removing a bottom corner concrete structure according to claim 1 or 2, wherein the side wall structure is a side wall structure made of a concrete tunnel lining that covers the inner circumferential surface of a mountain tunnel, the existing equipment structure provided extending along the length of the side wall structure is a piping equipment structure, and the concrete bottom corner structure formed at the joint corner between the side wall structure and the foundation is a corner structure made of a bottom concrete structure provided along the side edge of the pavement formed at the bottom of the tunnel.

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