JP6411048B2 - Dismantling method - Google Patents

Description

  The present invention relates to a method for dismantling a concrete member.

  In recent large-scale redevelopment work in urban areas, large-scale concrete members such as walls of existing underground structures may be dismantled when constructing a new large underground structure. In such a case, the concrete member is usually dismantled from top to bottom using a large heavy machine such as a giant breaker.

  On the other hand, as a method of dismantling the concrete member, a dismantling method by blasting of explosives as used in conventional civil engineering work is also conceivable (see Patent Document 1). There is also a method of inserting a hydraulic crusher or an expandable crushing agent into a hole provided in the member, thereby applying pressure to the concrete to generate cracks and dividing the concrete (for example, see Patent Document 2).

JP 2009-228977 A JP-A-7-324585

  However, when a large heavy machine such as a giant breaker is used, there is a problem that large noise and vibration are generated. In addition, a space for placing a large heavy machine is required at the time of dismantling, and it cannot be applied when working in a narrow space.

  The dismantling method by blasting also has the problem of noise and vibration. Especially in cases where the perimeter of the wall is constrained by pillars or beams, a large amount of drilling and charge is required, and there are significant noise and vibration problems that make it difficult to apply in urban construction.

  Inserting a hydraulic crusher into the hole and applying pressure to the concrete to generate cracks can be performed easily even in a small space, and there is little noise and vibration, but care must be taken when dismantling the wall. is necessary. For example, when pressure is applied to concrete with a hydraulic crusher and the concrete is pushed upwards and cracks are generated, the concrete is divided, and the divided concrete settles down by its own weight and closes the cracks, making it difficult to secondary crush the concrete with nibbles, etc. The hydraulic crusher may not come off due to the pressure of the settled concrete.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide a dismantling method that can suitably dismantle a concrete member such as a wall body.

In order to achieve the above-described object, the present invention includes a step (a) of forming a groove along the width direction of the planned dismantling region below the planned dismantling region of the vertical plate-like concrete member; A step of drilling a crushing hole upward, applying pressure from above the crushing hole only above and below the crushing hole by a hydraulic crusher installed in the crushing hole, and extruding the concrete member downward to divide the concrete member (B), and the step (b) is repeated to sever the concrete member in the planned dismantling region from the bottom in order.

  According to the disassembling method of the present invention, a plate-shaped concrete member in a vertical direction such as a wall body can be disassembled with a small number of perforations without using a large heavy machine. In addition, pressure is applied from the crushing hole above the groove, the concrete member is pushed down and divided, so when the divided concrete member settles under its own weight, cracks spread and secondary crushing by nibbles etc. becomes easy, The workability is improved without the hydraulic crusher being lost. Also, by crushing the concrete member using a hydraulic crusher, the concrete member can be pushed out in the intended direction, preventing unnecessary cracks from occurring in the surrounding concrete member, and easy crushing control become.

It is desirable that the concrete member is an underground wall connected to an underground pillar or an underground beam, and the demolished area of the underground wall is demolished, and then the underground pillar or the underground beam is demolished.
By dismantling the planned demolition area of the underground wall first, the underground pillars and beams can be dismantled using the space that originally had the underground wall, and the workability of the demolition work of the underground structure is improved.

It is desirable to dismantle the underground pillar or the underground beam after dismantling the planned dismantling area of the underground wall and removing the ground behind the underground wall.
When the underground wall is demolished, the ground behind it can be removed, and by removing the underground pillars and beams using the space after the ground is removed, the workability of demolishing the underground structure is improved.

  ADVANTAGE OF THE INVENTION According to this invention, the dismantling method which can dismantle concrete members, such as a wall body suitably, can be provided.

Diagram showing underground structure 1 Diagram showing the dismantling of wall 3 Figure showing dismantling the wall 3 The figure which shows the hydraulic crushers 31 and 37 A diagram showing a cut concrete member Diagram showing dismantling of pillar 5 and beam 7 Diagram showing dismantling of pillar 5

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(1. Underground structure 1)
FIG. 1 is a diagram showing an underground structure 1 that is dismantled by a dismantling method according to an embodiment of the present invention. 1A is a front view of the underground structure 1, FIG. 1B is a vertical section of the underground structure 1, and FIG. 1C is a horizontal section of the underground structure 1. 1B is a cross-sectional view taken along line AA in FIG. 1A, and FIG. 1C is a cross-sectional view taken along line BB in FIG.

  The underground structure 1 is a structure composed of concrete members such as walls 3, pillars 5, and beams 7 that are constructed underground. In the underground structure 1, the periphery of the wall 3 (underground wall), which is a plate member in the vertical direction, is connected to a column 5 (underground column) and a beam 7 (underground beam) and restrained.

(2. Demolition of wall 3)
In the dismantling method of this embodiment, first, the wall 3 of the underground structure 1 is dismantled. In order to disassemble the wall 3, as shown in FIG. 2A, a slit-like groove 9 in a substantially horizontal direction (width direction of the dismantling scheduled area 3a) is formed below the dismantling scheduled area 3a of the wall 3. . The groove 9 is formed, for example, by continuously drilling a plurality of holes, but is not limited thereto. Further, the inner surface of the groove 9 is exposed to the outside and becomes a free surface without restraint.

  Next, as shown in FIG. 2B, the crushing hole 13 is drilled above the groove 9. And a hydraulic crusher is installed in the crushing hole 13, and the concrete member of the wall 3 is parted using a hydraulic crusher.

  In order to divide the concrete member, for example, as shown in the upper diagram of FIG. 4A, the wedge liner 27 at the tip of the hydraulic crusher 31 is inserted into the crushing hole 13. And as shown in the following figure, the wedge-shaped wedge 29 is pushed in with hydraulic pressure, the wedge liner 27 is expanded up and down, and a pressure is applied to the concrete member of the wall 3 as shown by the arrow C.

  Then, by this pressure, the concrete member between the crushing hole 13 and the groove 9 is pushed out to the lower groove 9, and as shown in FIG. Is generated and the concrete member is divided. Although the hydraulic crusher 31 applies pressure also above the crushing hole 13, since there is no free surface above, the pressure by the hydraulic crusher 31 acts exclusively as a force for pushing the concrete member downward.

  As the hydraulic crusher, a hydraulic crusher 37 shown in FIG. 4B can also be used. This hydraulic crusher 37 is provided with a projecting portion 35 that can be advanced and retracted in a rod-shaped main body 33, and after inserting the projecting portion 35 into the main body 33 as shown in the above figure, As shown in the following figure, the protrusion 35 is protruded by hydraulic pressure. Thereby, a pressure can be applied to the concrete member of the wall 3 as shown by the arrow C as described above, and the crack 19 can be generated in the concrete member and divided.

  FIG.5 (b) is a figure which shows the state after a certain amount of time passes about the divided | segmented concrete member. When the concrete member is divided, the divided concrete member is settled by its own weight as indicated by an arrow D, and the width of the crack 19 is expanded.

  In this way, pressure is applied from the crushing hole 13 by the hydraulic crusher, the concrete member is pushed downward from the crushing hole 13 toward the groove 9, and the concrete member is divided at the divided section by the crack 19 between the crushing hole 13 and the groove 9. To do. FIG. 2C shows a state after the concrete member is divided. The divided section 17 obtained by dividing the concrete member becomes a new free surface.

  In the present embodiment, a new crushing hole 13 is subsequently drilled next to the crushing hole 13 as shown in FIG. 2 (d), and pressure is applied in the same manner as described above using a hydraulic crusher installed in the new crushing hole 13. , Push the concrete member downward and divide it. Here, the concrete member is divided at the dividing surface 17 connecting each of the new crushing hole 13, the crushing hole 13 formed previously, and the groove 9.

  In the present embodiment, by repeating the above-described steps, the concrete member at the lower stage of the dismantling scheduled area 3a of the wall 3 is divided as shown in FIG. Thereafter, the upper concrete member is divided in the same procedure. In this way, the concrete member in the planned demolition area 3a is divided in order from the lower stage to the upper stage, and the concrete member in the entire planned demolition area 3a of the wall 3 is divided as shown in FIG.

  When the divided concrete member is removed by secondary crushing or the like, an opening 3b is formed in the planned dismantling area 3a as shown in FIG. As the secondary crushing, for example, a nibbler claw can be inserted into the crack 19 between the concrete members to bite the concrete member, or the tip of the ripper can be inserted into the crack 19 to vibrate to crush the concrete member. As described above, the width of the crack 19 widens due to the settling of the concrete member, so that the nibbler claw and the tip of the ripper can be easily inserted and secondary crushing can be easily performed. Moreover, noise and vibration are small by using a small heavy machine such as a nibler or a ripper for secondary crushing.

  The divided concrete members can be removed at an appropriate point in the dismantling procedure, rather than being collectively crushed and removed as described above. Further, in the above example, after the concrete member is divided by the full width of the lower stage of the dismantling scheduled area 3a, the upper concrete member is divided, but after part of the concrete member in the width direction of the dismantling scheduled area 3a is divided, The upper concrete member may be divided. By repeating this process in the width direction of the planned demolition area 3a, the concrete member in the entire demolition planned area 3a can be divided.

(3. Demolition of pillar 5 and beam 7)
At the time of dismantling the pillar 5 and the beam 7 of the underground structure 1, the ground 2 behind the wall 3 is scraped and removed from the opening 3b formed by dismantling the planned dismantling area 3a of the wall 3. This state is shown in FIG. In addition, in the example of Fig.6 (a), when removing the ground 2, the remaining part of the lower end part of the wall 3 is also removed.

  In the present embodiment, the column 5 and the beam 7 are disassembled with a wire saw, a nibler, or the like, using the space behind the underground structure 1 generated by removing the ground 2. For example, in the case of a nibler, as shown in FIG. 6 (b), the front and rear surfaces of the pillar 5 can be grasped by the claws 21, and the pillar 5 can be crushed at once and crushed. The same applies to the beam 7, and the front and back surfaces of the beam 7 can be grasped with the claws 21 and can be crushed at once as shown in FIG. 6C.

  In the case of a wire saw, the horizontal cross section of the pillar 5 can be cut at a time by the wire 23 turned behind the pillar 5 as shown in FIG. In the case of the beam 7 as well, the vertical cross section of the beam 7 can be cut at a time by the wire 23 turned behind the beam 7 as shown in FIG. By using a nibra or wire saw, noise and vibration can be kept small.

  Thus, according to this embodiment, the wall 3 which is a plate-shaped concrete member in the vertical direction can be disassembled with a small number of perforations without using a large heavy machine. In addition, since pressure is applied from the crushing hole 13 above the groove 9 and the concrete member is pushed down and divided, the divided concrete member settles down by its own weight, and the crack 19 spreads to facilitate secondary crushing with a nibler or the like. Thus, the workability is improved without the hydraulic crusher being lost. Also, when crushing a concrete member using a hydraulic crusher, the concrete member can be pushed out in the intended direction, preventing unnecessary cracks from occurring in the surrounding concrete member, and crushing control is easy. There are also advantages.

  In this embodiment, the wall 3 is disassembled first, so that the ground 2 behind the wall 3 can be removed, and the columns 5 and the beams 7 can be easily disassembled using the space. The workability of 1 dismantling work is improved.

  In the present embodiment, after the crushing hole 13 is drilled, the procedure of dividing the concrete member by applying pressure from the crushing hole 13 is repeated, and a new crushing hole 13 is formed at an appropriate place in consideration of the state of crushing. There is an advantage that can be perforated. However, all necessary crushing holes 13 can be previously drilled.

  In addition, the number and positions of the crushing holes 13 and the dismantling procedure of the dismantling scheduled area 3a are not limited to those described above. These can be set to be optimum according to the conditions of the dismantling scheduled area 3a. Further, the range of the planned dismantling area 3a is not limited to the above-described one. For example, only the upper half of the wall 3 may be set as the dismantling planned area 3a. Also in this case, the groove 9 is formed below the planned demolition area 3a, and the concrete member in the planned demolition area 3a can be demolished by the above procedure. In addition, the object to be dismantled by dividing the concrete member using the hydraulic crusher is not limited to the wall 3 described above, and may be a plate member in the vertical direction.

  Further, the dismantling method of the column 5 and the beam 7 is not limited to the above. For example, in the example of FIG. 7A, the mountain retaining wall 2a exists behind the underground structure 1, and the ground 2 cannot be removed even after the dismantling planned area 3a of the wall 3 is dismantled. By grasping the inner surface of the column 5 exposed by the disassembly and removal of 3a and the surface opposite to the inner surface with the claw 21, the horizontal section of the column 5 can be broken by the nibler. Also in the case of using a wire saw, as shown in FIG. 7 (b), a core hole 5a penetrating the pillar 5 is drilled from the inner surface of the pillar 5 exposed by removing the planned dismantling area 3a, and the wire passed through the core hole 5a. The horizontal section of the pillar 5 can be cut by 23. The same applies to the beam 7.

  In this way, even if the ground 2 behind cannot be removed due to the presence of the mountain retaining wall 2a or the like, the column 5 or the beam 7 can be bitten or cut at a time by the amount of the planned dismantling area 3a of the wall 3 being removed. It is possible to widen the area that can be done, improving the workability of dismantling work.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

1 ……… Underground structure 2 ……… Ground 3 ……… Wall 3a ……… Scheduled area 5 ……… Pillar 7 ……… Beam 9 ……… Groove 13 ……… Fracture hole 17 ……… minute Cross section 19 ……… Crack 31, 37 ……… Hydraulic crusher

Claims (3)

A step (a) of forming a groove along the width direction of the planned demolition area below the planned demolition area of the plate-shaped concrete member in the vertical direction;
A crushing hole is drilled above the groove, and a pressure is applied from above the crushing hole only above and below the crushing hole by a hydraulic crusher installed in the crushing hole, and the concrete member is pushed downward to remove the concrete member. A step (b) of dividing;
Comprising
The dismantling method characterized by repeating the step (b) and dividing the concrete members in the dismantling scheduled area in order from the bottom. The concrete member is an underground wall connected to an underground column or an underground beam;
The dismantling method according to claim 1, wherein after dismantling the dismantling scheduled area of the underground wall, dismantling the underground pillar or underground beam.   The dismantling method according to claim 2, wherein the dismantling scheduled area of the underground wall is dismantled and the ground behind the underground wall is removed, and then the underground pillar or underground beam is dismantled.

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