WO2015108098A1

WO2015108098A1 - Dismantling method

Info

Publication number: WO2015108098A1
Application number: PCT/JP2015/050904
Authority: WO
Inventors: 隆寛中村; 柳田　克巳; 鈴木　宏一; 美那岡村; 佳久松石; 祐司山川; 河野　雄一郎; 公明村上; 悠也村上; 松田　明
Original assignee: 鹿島建設株式会社
Priority date: 2014-01-20
Filing date: 2015-01-15
Publication date: 2015-07-23
Also published as: TW201540919A; SG11201605798WA; TWI657182B

Abstract

The present invention provides a dismantling method able to favorably dismantle a concrete member, and when dismantling a band-shaped planned-dismantlement region (3) of a pressure-resistant plate (105), first, opening sections (5) traversing the entire width of the planned-dismantlement region (3) are formed at intervals in the lengthwise direction of the planned-dismantlement region (3). Next, a step is repeated in which pressure is applied from pulverization holes (25) punctured at intermediate regions (13) between the opening sections (5), and the concrete member is pressed out in the direction of the opening sections (5) to break the concrete member. The concrete member at the intermediate regions (13) is sequentially broken from each opening section (5) side.

Description

Dismantling method

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

In the recent large-scale redevelopment work in the city center, large-scale concrete members such as pressure panels of existing underground structures may be locally dismantled when constructing new large underground structures.

FIG. 19A is an example of an existing structure 103 having a pressure platen 105 that is a large concrete member. In order to construct a new structure below the existing structure 103, first, as shown in FIG. 19B, the outer periphery of the pressure platen 105 is disassembled and removed, and the earth retaining material is placed on the ground 101 below the dismantled part. A wall 107 is provided. Then, as shown in FIG. 19C, the remaining part of the pressure platen 105 is disassembled and removed, and the ground 101 inside the retaining wall 107 is excavated. After this, a structure is constructed at the excavation site.

As a method for dismantling the concrete member, a breaker or the like that breaks the member by hitting the member or the like is often used, but there is a problem that noise or vibration occurs when the member is broken by hitting.

As a dismantling method with little noise and vibration, there is a method of using a hydraulic crusher (nibra) that crushes by crushing a concrete member between claws. Alternatively, when the construction site is narrow and large heavy machinery cannot be used, a method of cutting the concrete member by continuous core boring is often used. In this method, a member is cut by a plurality of continuous boring holes so that it can be lifted and taken out.

Further, there is a method (for example, Patent Documents 1 to 3) in which a hydraulic crusher, an expansible crushing agent, or the like is inserted into a hole provided in a concrete member, thereby generating a crack by applying pressure to the member.

Also, there is a method in which a large casing is rotated all around to cut a concrete member into a circle, and the cut member is taken out with a hammer grab attached to an external crawler crane and disassembled, which is known as a CD method.

Also, when dismantling large concrete members such as walls of existing underground structures, the concrete members are usually disassembled from top to bottom using large heavy machinery such as a giant breaker.

Furthermore, as a method of dismantling the concrete member, a method of dismantling by explosive blasting as used in conventional civil engineering work is also conceivable (see Patent Document 4).

JP 2003-90316 A Japanese Unexamined Patent Publication No. 7-324585 JP-A 61-155589 JP 2009-228977 A

In the case of dismantling the pressure plate of the existing structure described above, since the periphery of the pressure plate is constrained, a large force is required in the dismantling method by hitting. Therefore, it is desirable to use a large heavy machine. However, when disassembling in a narrow space in an existing structure, a small heavy machine must be used, and the dismantling efficiency is extremely reduced.

Also, in the disassembly method using the nibra, it is necessary to form a large number of holes for inserting the claw portions in the member, which increases the construction period and costs. Even in the dismantling method by continuous core boring, it is necessary to form a large number of holes in the member, and the same problem occurs.

When the concrete member is divided by applying pressure, the above problems are few. However, in the conventional method, members in a region in a straight line connecting a large number of holes are crushed at a time, so that a large working pressure is required to disassemble the member whose periphery is constrained. When the working pressure is large, there arises a problem that the crushed member is scattered out of the plane. Further, if the crushing of the concrete member and the removal of the crushing glass are repeated alternately, the replacement of heavy machinery or the like tends to increase, and the dismantling efficiency decreases.

¡The CD method is costly because the equipment itself and crawler crane that rotate the entire circumference of the casing are large. In addition, the work by the device main body is mainly performed on the existing structure. However, since the device is large, it is necessary to reinforce the existing structure, which is inefficient.

Also, when a large heavy machine such as a giant breaker is used for dismantling the wall, 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 has the same problems 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 by a hydraulic crusher and the concrete is pushed upwards and cracks are generated and the concrete is divided, the divided concrete settles under 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 of the present invention is to provide a dismantling method that can suitably dismantle a concrete member.

A first invention for achieving the above-described object is a dismantling method for disassembling a concrete member, the step (a) of forming an opening at an interval in a planned dismantling region of the concrete member, A step (b) in which a pressure is applied from a crushing hole drilled in a concrete member in an intermediate region between the openings, and the concrete member is extruded in the direction of the openings to divide the concrete member, b) is repeated, and the concrete member in the intermediate region is cut in order from each opening side.

In the present invention, after the openings are formed at intervals, the concrete member in the intermediate region between them is divided and crushed. At this time, the process of pressing and dividing the concrete member in the direction of the opening by applying pressure from a crushing hole drilled at an appropriate position is repeated, and the cutting is performed in order from each opening. In this method, a large heavy machine is not required, the number of drilling holes in the member is small, the work is easy, and the cost and work period can be reduced. In addition, work can be performed in a narrow underground area, and there are few problems of noise and vibration. Furthermore, since the concrete member can be divided with a smaller working pressure than the conventional method of crushing members in a straight line connecting a large number of holes at a time, problems such as scattering of members do not occur. In addition, replacement of heavy machinery can be reduced, and dismantling efficiency is high.

In the step (b), it is desirable to apply pressure to the concrete member using a hydraulic crusher.
By using a hydraulic crusher, pressure can be applied only in a predetermined direction, so that 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. become.

In the step (a), a continuous core hole in which a plurality of core holes are continuous is formed, and the concrete member is extruded in the direction of the continuous core hole from a crushing hole drilled around the continuous core hole, thereby dividing the concrete member. It is desirable to remove the separated concrete member.
In this case, it is preferable to use a common heavy machine or the like when dividing the intermediate region when forming the opening.

In the step (a), it is also desirable to extrude the concrete member in the direction of the surface of the concrete member from the crushing holes drilled obliquely in the vertical plane, divide the concrete member, and remove the divided concrete member. .
In this case, since the concrete is extruded and divided in the direction of the surface of the concrete member, there is an advantage that it is not necessary to secure a moving space for the concrete member by perforating the concrete member in advance.

In the step (a), it is also desirable to drill a core hole having a diameter over the entire width of the planned dismantling region.
In this case, there is an advantage that an opening can be formed only by drilling one core hole.

Further, in the step (a), a core hole having a diameter smaller than the entire width of the planned dismantling region is drilled, and a concrete member is formed in the direction of the core hole from the crushing holes drilled at both ends in the width direction of the dismantling planned region. It is desirable to extrude and divide the concrete member, and to remove the divided concrete member.
In this case, there are advantages that the number of perforations can be reduced and the width of the opening can be set variously.

In the step (a), it is also desirable that a plurality of core holes form a continuous core hole that is continuous over the entire width of the planned dismantling region.
This has the advantage that a narrow opening can be formed.

The concrete member is preferably a pressure-resistant panel of a structure.
When dismantling such a structure, the work is performed in a narrow space, and the periphery of the planned dismantling area is also restricted, so that the dismantling method according to the present invention is particularly effective.

In the second invention, the step (a) of forming a groove along the width direction of the planned dismantling area below the planned dismantling area of the plate-shaped concrete member in the vertical direction, and a hole drilled above the groove A step (b) in which pressure is applied from a crushing hole by a hydraulic crusher and the concrete member is pushed downward to divide the concrete member, and the step (b) is repeated, and the concrete member in the planned dismantling region Is a disassembling method characterized in that is divided in order from the bottom.

According to the disassembling method of the second invention, it is possible to dismantle a plate-shaped concrete member in the vertical direction such as a wall body 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 dismantling 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 dismantling work of the underground structure will be 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.

According to the present invention, it is possible to provide a dismantling method that can dismantle concrete members appropriately.

Diagram showing the outline of the dismantling method Plan view near the opening area The figure explaining the hydraulic crusher 15 Plan view of dismantling planned area 3 Plan view of dismantling planned area 3 The figure which shows the crushing hole 33 of an opening part area | region The figure explaining the hydraulic crusher 37 The figure explaining division of the concrete member in an opening part field The figure explaining formation of the opening part 5 The figure explaining formation of the opening part 5 The figure explaining formation of the opening part 5 Diagram showing underground structure 71 The figure which shows the demolition of the wall 73 Diagram showing dismantling of wall 73 The figure which shows the hydraulic crushers 15 and 37 A diagram showing a cut concrete member Diagram showing dismantling of column 75 and beam 77 Diagram showing dismantling of pillar 75 The figure which shows the example of the existing structure 103

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

[First Embodiment]
(1. Outline of dismantling method)
First, an outline of the dismantling method according to the first embodiment of the present invention will be described. Here, it is assumed that the outer peripheral portion of the pressure platen 105, which is a large concrete member described in FIG.

In this embodiment, in the strip-shaped dismantling scheduled area 3 of the pressure platen 105 shown in FIG. 1A, first, as shown in FIG. 1B, a rhombus rectangular plane opening over the entire width of the dismantling scheduled area 3 The parts 5 are formed at a predetermined interval 7 in the length direction of the planned dismantling area 3.

For example, when the pressure platen 105 has a thickness of 650 mm and the width 9 of the planned dismantling area 3 is about 1 m, the distance 7 between the openings 5 is about 5 m, and the width 8 of the openings 5 is 0.5 m or more and 1 m. The range is as follows.

Subsequently, the concrete member in the intermediate region 13 between the adjacent openings 5 is sequentially divided and crushed from the side of each opening 5 to obtain a crushed glass 14 as shown in FIG. When these crushing debris 14 are removed, the dismantling of the dismantling scheduled area 3 is completed as shown in FIG.

Next, the formation of the opening 5 and the division of the concrete member in the intermediate region 13 will be described.

(2. Formation of opening 5)
First, the formation of the opening 5 will be described with reference to FIG. FIG. 2 is a plan view in the vicinity of a region where the opening 5 is formed (hereinafter referred to as an opening region).

In the present embodiment, as shown in FIG. 2A, a continuous core hole 19 is formed at the center of the opening region, and a plurality of crushing holes 21 are formed around the continuous core hole 19.

The continuous core hole 19 is formed by drilling a plurality of core holes continuous in the length direction (corresponding to the left-right direction in the figure, hereinafter referred to as the region length direction) of the dismantling scheduled region 3. The crushing holes 21 are drilled at both ends in the width direction (corresponding to the vertical direction in the figure, hereinafter referred to as the region width direction) of the dismantling scheduled region 3. The crushing hole 21 is formed on the side of the continuous core hole 19 in the region width direction. The core hole or crushing hole 21 is drilled by core boring or a rock drill, and penetrates the pressure platen 105 in the thickness direction. Although the diameter of one hole shall be about 100 mm, it is not restricted to this.

Subsequently, the concrete member in the opening area is divided using a hydraulic crusher. The hydraulic crusher applies pressure to a concrete member to generate a crack, and divides and crush the concrete member.

FIG. 3A shows an example of the hydraulic crusher 15. As shown in the left diagram of FIG. 3A, the wedge liner 17 at the tip of the hydraulic crusher 15 is inserted into the crushing hole 21, and as shown in the right diagram of FIG. Is pushed by hydraulic pressure to spread the wedge liner 17 on both sides. Then, pressure can be applied to the concrete member from the crushing hole 21.

As shown in the left diagram of FIG. 3B, the hydraulic crusher 15 is inserted into the crushing hole 21 on the side of the continuous core hole 19, and the wedge liner 17 is inserted in the direction connecting the crushing hole 21 and the continuous core hole 19. By expanding, pressure is applied to the concrete member between the crushing hole 21 and the continuous core hole 19. Then, the concrete member is pushed out in the direction of the continuous core hole 19 indicated by the arrow, and as shown in the right view of FIG. 3 (b), the concrete member has a section 23 connecting the both ends of the crushing hole 21 and the continuous core hole 19. Is divided.

In addition, when the wedge liner 17 is expanded, pressure is also applied in a direction opposite to the direction from the crushing hole 21 toward the continuous core hole 19. However, since there is no continuous core hole 19 (free surface) in this direction, the concrete member cannot move, and the pressure from the wedge liner 17 acts exclusively as a force for pushing the concrete member toward the continuous core hole 19.

In this embodiment, the hydraulic crusher 15 is inserted into the crushing hole 21 shown in FIG. And as mentioned above, as shown in FIG.2 (b), the concrete member between each crushing hole 21 and the continuous core hole 19 is each extruded in the direction of the continuous core hole 19 shown by the arrow. As a result, the concrete member is divided as shown in FIG. 2 (c), and a divided section 23 is formed between both ends of each of the crushing holes 21 and the continuous core holes 19 in the region length direction.

¡After crushing and crushing concrete parts that have been cut and crushed in this way, use a ripper or the like to secondary crush them to a size that is easy to remove, and then remove them completely using a bucket or the like. The ripper inserts a tooth at the tip into a gap or the like of the concrete member and vibrates up and down to crush the concrete member. As described above, the opening 5 is formed as shown in FIG. 2D, and this is the state shown in FIG.

(3. Splitting of concrete members in the intermediate region 13)
Then, the division | segmentation of the concrete member of the intermediate | middle area | region 13 between the opening parts 5 is demonstrated with reference to FIG. 4, FIG. 4 and 5 are plan views of the dismantling scheduled area 3.

In this embodiment, as shown in FIG. 4 (a), the crushing holes 25 are drilled at both end portions in the region width direction of the dismantling scheduled region 3 on both sides of each opening 5 in the region length direction.

Next, the hydraulic crusher 15 is inserted into the crushing hole 25, and the concrete member between the crushing hole 25 and the opening 5 is pushed out in the direction of the opening 5 indicated by the arrow. As a result, the concrete member is divided as shown in FIG. 4B, and a dividing surface 27 is formed between the crushing hole 25 and both end portions of the side of the opening 5 facing the crushing hole 25. .

Subsequently, as shown in FIG. 4 (c), new crushing holes 25 are provided at the center in the region width direction of the dismantling scheduled region 3 on both sides in the region length direction of the opening 5. These crushing holes 25 are drilled from the opening 5 at a predetermined drilling interval. The perforation interval is, for example, about 400 mm to 600 mm, and is about half the width of the dismantling scheduled area 3.

Then, the hydraulic crusher 15 is inserted into these new crushing holes 25, and the concrete member between the crushing holes 25 and the dividing surface 27 at a position facing the crushing holes 25 is pushed out in the direction of the opening 5 indicated by the arrow. As a result, the concrete member is divided, and a new dividing section 27 is formed between the new crushing hole 25 and the crushing holes 25 at both ends in the region width direction as shown in FIG. . By pushing the concrete members in the direction of the openings 5 as described above, the concrete members for one row are divided.

Subsequently, as shown in FIG. 5 (a), new crushing holes 25 are drilled at both end portions in the region width direction on the side of the new dividing surface 27 in the region length direction. Thereafter, the same operation as in FIGS. 4A to 4D is repeated, and the concrete members in the intermediate region 13 are sequentially cut from the side of each opening 5 toward the center between the openings 5. go.

Thus, as shown in FIG. 5 (b), the concrete members are divided into about four rows, and the concrete members are divided to the center between the openings 5. Thereafter, the concrete member remaining in the central portion or the divided concrete member is secondarily crushed using a nibler or a ripper to obtain a crushed glass having a size that is easy to remove. This state is shown in FIG.

Then, when all the crushed glass is removed as shown in FIG. 5 (c), the concrete dismantling of the strip-shaped dismantling planned area 3 is completed as shown in FIG. 1 (d).

In the above process, the divided concrete member may be removed when it accumulates to some extent. Further, the interval 7 and the width 8 of the opening 5, the shape, the size of the continuous core hole 19, the number and positions of the crushing

holes

21 and 25 are not limited to the above, and the size and introduction of the planned dismantling area 3 can be made. It is possible to plan optimally according to the size and performance of heavy machinery. Furthermore, although the drilling of the crushing holes 25 and the partitioning of the concrete member are repeated in the example of the figure, depending on the case, it is possible to drill all the necessary crushing holes 25 in advance.

Thus, in 1st Embodiment, after forming the opening part 5 at intervals, the concrete member of the intermediate | middle area | region 13 in the meantime is parted and crushed. At this time, the process of applying pressure from the crushing holes 25 perforated at appropriate positions to push the concrete member in the direction of the opening 5 and dividing it is repeated, and the dividing is performed in order from each opening 5 side. In this method, a large heavy machine is not required, the number of drilling holes in the member is small, the work is easy, and the cost and work period can be reduced. In addition, work can be performed in a narrow underground area, and there are few problems of noise and vibration. Furthermore, since the concrete member can be divided with a smaller working pressure than the conventional method of crushing members in a straight line connecting a large number of holes at a time, problems such as scattering of members do not occur.

Further, when the concrete member is divided as in the present embodiment, when one opening portion 5 is formed and the concrete member is repeatedly extruded toward the opening portion 5, extrusion of about four rows is the limit. Therefore, in this embodiment, after forming a plurality of openings 5 first, the concrete member in the intermediate region 13 is pushed out to the openings 5 on both sides and divided in order from each opening 5 side. The region where the member can be divided is lengthened. Thereby, the dismantling of the planned dismantling area 3 can be efficiently performed with less replacement of heavy machinery or the like.

Moreover, in this embodiment, since it can pressurize only to a predetermined direction by using the hydraulic crusher 15, a concrete member can be extruded in the intended direction, and a useless crack generate | occur | produces in the surrounding concrete member. It is prevented and crushing control becomes easy. Further, since the pressure required for the division and the size of the concrete member after the division are proportional, the pressure applied from the hydraulic crusher 15 can be calculated in advance, which is effective for the work plan.

Moreover, in this embodiment, when forming the opening part 5, since a concrete member is extruded and divided | segmented from the crushing hole 21 to the direction of the continuous core hole 19, the heavy equipment etc. which are common at the time of the division | segmentation of the concrete member of the intermediate | middle area | region 13 are used. It can be used and is preferable.

In the present embodiment, the example in which the strip-shaped dismantling scheduled area 3 is disassembled at the outer periphery of the pressure plate 105 of the existing structure 103 has been described, but the application target of the present invention is not limited thereto. For example, the present invention can be applied to the dismantling of various concrete members such as wall bodies such as outer walls, earth pressure walls, and temporary continuous walls, slabs, foundations, etc., centering on plate-like members. Various shapes of the planned dismantling area 3 are also conceivable. However, when the pressure platen 105 is dismantled, the work is performed in a narrow space, and the periphery of the planned dismantling area 3 is also constrained, so that the dismantling method according to the present invention is particularly effective.

Subsequently, another example of the present invention will be described as second to fifth embodiments. Each embodiment is an example different from the first embodiment in the method of forming the opening 5, and the other points are the same as those in the first embodiment. To do.

[Second Embodiment]
First, a second embodiment of the present invention will be described. In this embodiment, when the opening 5 is formed, the crushing hole 33 is drilled as shown in FIG. FIG. 6 is a view showing the crushing hole 33 in the opening area, the upper figure is a plan view in the vicinity of the opening area, and the lower figure is a cross-sectional view along the line AA in the upper figure.

As shown in the figure, the crushing hole 33 includes a crushing hole 33a and a crushing hole 33b.

The crushing hole 33a is formed by drilling obliquely downward toward the central portion from the vicinity of both sides of the central portion in the region length direction of the opening region. The crushing hole 33a is drilled at a shallow position of the pressure platen 105. The pair of crushing holes 33a in the region length direction are at positions corresponding to the bottoms, and these are provided in a substantially V shape in the vertical plane.

The crushing holes 33b are formed by drilling diagonally downward from both ends in the region length direction of the opening region toward the center. The crushing hole 33 b is drilled to a deep position of the pressure platen 105. Similar to the crushing holes 33a, the pair of crushing holes 33b in the region length direction are at positions corresponding to the bottoms, and these are provided in a substantially V shape in the vertical plane.

In this embodiment, the concrete member is divided and crushed using the hydraulic crusher 37 shown in FIG. This hydraulic crusher 37 has a rod-like main body 38 provided with a projecting portion 39 that can be advanced and retracted. As shown in the left diagram, the hydraulic crusher 37 is inserted into the crushing hole 33 with the projecting portion 39 retracted, and is As shown, by projecting the projecting portion 39 by hydraulic pressure, pressure can be applied to the concrete member to extrude it, thereby generating a crack.

FIG. 8 is a diagram for explaining the division of the concrete member in the opening region. 8A to 8C are plan views in the vicinity of the opening region, and the lower diagram is a cross-sectional view taken along line BB in the upper diagram.

In this embodiment, first, the hydraulic crusher 37 is inserted into each of the crushing holes 33 a shown in FIG. 6, and the protruding portion 39 is protruded toward the surface of the pressure platen 105. Then, the concrete member in the region surrounded by the crushing holes 33a is pushed out in the direction of the surface of the pressure platen 105, and is divided at the dividing surface 34 shown in FIG.

Subsequently, the hydraulic crusher 37 is inserted into each of the crushing holes 33b, and the concrete member in the region surrounded by the crushing holes 33b is pushed out toward the surface of the pressure platen 105 in the same manner as described above. Then, the concrete member is divided at a new dividing section 34 shown in FIG.

When the concrete member divided as described above is removed after secondary crushing as necessary, an opening 5 is formed as shown in FIG. Thereafter, the concrete member in the intermediate region 13 is divided by the same method as in the first embodiment, and the dismantling scheduled region 3 of the pressure-resistant platen 105 can be disassembled.

In the second embodiment, since the concrete member is extruded and divided in the direction of the surface of the pressure platen 105, the continuous core hole 19 is formed as in the first embodiment to secure a moving space for the concrete member. There is an advantage that it does not take time. In the present embodiment, the concrete member is extruded from the plurality of crushing holes 33a or crushing holes 33b at the same time. In this embodiment, the hydraulic crusher 37 shown in FIG. 7 is used, but the hydraulic crusher 15 shown in FIG. 3A can also be used. Similarly, not only the hydraulic crusher 15 shown in FIG. 3A but also the hydraulic crusher 37 shown in FIG. 7 can be used in the first embodiment. The same applies to the following embodiments.

[Third Embodiment]
Next, a third embodiment of the present invention will be described with reference to FIG.

In the present embodiment, as shown in FIG. 9, a large-diameter core hole 41 having a diameter over the entire width of the planned dismantling region 3 is drilled to form the opening 5. For punching the core hole 41, a small punching machine such as a BG machine can be used.

Thereafter, the concrete member in the intermediate region 13 is divided by the same method as in the first embodiment, and the dismantling scheduled region 3 of the pressure platen 105 can be disassembled.

In the third embodiment, there is an advantage that the opening 5 can be easily formed only by drilling one core hole 41.

[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described with reference to FIG.

In the present embodiment, as shown in FIG. 10A, a core hole 51 having a medium diameter smaller than the entire width of the planned dismantling area 3 is drilled using a BG machine or the like. Further, the crushing holes 53 are drilled on both sides of the core hole 51 in the region width direction. The crushing holes 53 are provided at both ends in the region width direction of the dismantling scheduled region 3.

And a hydraulic crusher is inserted in these crushing holes 53, pressure is applied to the direction of the core hole 51 from the crushing holes 53, and the concrete member between each crushing hole 53 and the core hole 51 is shown in the core hole 51 shown by the arrow. Extrude in the direction of. Then, as shown in FIG. 10B, the concrete member is divided, and a divided section 55 is formed between both ends of each crushing hole 53 and the core hole 51 in the region length direction.

When the concrete member divided as described above is all removed after secondary crushing as necessary, an opening 5 is formed as shown in FIG. Thereafter, the concrete member in the intermediate region 13 is divided by the same method as in the first embodiment, and the dismantling scheduled region 3 of the pressure-resistant platen 105 can be disassembled.

In the fourth embodiment, since only the core hole 51 and the two crushing holes 53 are drilled, the number of drilling operations can be reduced, and the diameter of the core hole 51 can be changed to vary the width of the opening 5. There is an advantage that can be set.

[Fifth Embodiment]
Next, a fifth embodiment of the present invention will be described with reference to FIG.

In the present embodiment, as shown in FIG. 11, the opening 5 is formed by forming the continuous core hole 61 continuous over the entire width of the planned dismantling region 3. As described above, the continuous core hole 61 is formed by drilling a plurality of core holes continuous in the region width direction.

In the fifth embodiment, since the opening 5 is formed by the continuous core hole 61, it is effective when the narrow opening 5 is formed. When the opening 5 is thin, if the concrete member in the intermediate region 13 is divided as in the first embodiment, there may be no place where the claw portion can be inserted when secondary crushing with a nibler. It is desirable to use a ripper for the next crushing. In this case, it is sufficient if the width of the opening 5 can be secured about 200 mm to 300 mm.

[Sixth Embodiment]
(1. Underground structure 71)
FIG. 12 is a diagram showing an underground structure 71 that is dismantled by the dismantling method according to the sixth embodiment of the present invention. 12A is a front view of the underground structure 71, FIG. 12B is a vertical section of the underground structure 71, and FIG. 12C is a horizontal section of the underground structure 71. 12B is a cross-sectional view taken along line CC in FIG. 12A, and FIG. 12C is a cross-sectional view taken along line DD in FIG.

The underground structure 71 is a structure constructed of concrete members such as walls 73, columns 75, beams 77, etc., constructed underground. In the underground structure 71, the periphery of the wall 73 (underground wall), which is a plate member in the vertical direction, is connected to a column 75 (underground column) and a beam 77 (underground beam) and restrained.

(2. Dismantling of wall 73)
In the dismantling method of this embodiment, first, the wall 73 of the underground structure 71 is dismantled. In order to disassemble the wall 73, as shown in FIG. 13A, a slit-like groove 79 in a substantially horizontal direction (width direction of the dismantling scheduled area 73a) is formed below the dismantling scheduled area 73a of the wall 73. . The groove 79 is formed, for example, by continuously drilling a plurality of holes, but is not limited thereto. Further, the inner surface of the groove 79 is exposed to the outside and becomes a free surface without restraint.

Next, as shown in FIG. 13B, a crushing hole 83 is drilled above the groove 79. And a hydraulic crusher is installed in the crushing hole 83, and the concrete member of the wall 73 is divided using a hydraulic crusher.

In order to cut the concrete member, the wedge liner 17 at the tip of the hydraulic crusher 15 is inserted into the crushing hole 83, for example, as shown in the upper diagram of FIG. And as shown in the following figure, the wedge-shaped wedge 18 is pushed in with hydraulic pressure, the wedge liner 17 is expanded up and down, and a pressure is applied to the concrete member of the wall 73 as shown by the arrow E.

Then, the concrete member between the crushing hole 83 and the groove 79 is pushed out to the lower groove 79 by this pressure, and a crack 89 from both sides of the crushing hole 83 toward the lower groove 79 as shown in FIG. Is generated and the concrete member is divided. Although the hydraulic crusher 15 applies pressure also above the crushing hole 83, since there is no free surface above, the pressure by the hydraulic crusher 15 acts exclusively as a force pushing the concrete member downward.

As the hydraulic crusher, a hydraulic crusher 37 shown in FIG. 15B can also be used. As described above, the hydraulic crusher 37 is provided with the protrusion 39 that can be moved back and forth in the rod-shaped main body 38, and is inserted into the crushing hole 83 with the protrusion 39 retracted into the main body 38 as shown in the above figure. After that, the protruding portion 39 is protruded by hydraulic pressure as shown in the following figure. As a result, a pressure can be applied to the concrete member of the wall 73 as shown by the arrow E as described above to generate a crack 89 in the concrete member, which can be divided.

FIG. 16 (b) is a diagram showing a state after a certain amount of time has passed for the divided concrete member. When the concrete member is divided, the divided concrete member is settled by its own weight as indicated by an arrow F, and the width of the crack 89 is expanded.

In this way, pressure is applied from the crushing hole 83 by the hydraulic crusher, the concrete member is pushed downward from the crushing hole 83 toward the groove 79, and the concrete member is divided at a divided section by a crack 89 between the crushing hole 83 and the groove 79. To do. FIG. 13C shows a state after the concrete member is divided. A divided section 87 obtained by dividing the concrete member becomes a new free surface.

In the present embodiment, a new crushing hole 83 is subsequently drilled next to the crushing hole 83 as shown in FIG. 13 (d), and pressure is applied in the same manner as described above using a hydraulic crusher installed in the new crushing hole 83. , Push the concrete member downward and divide it. Here, the concrete member is divided at a dividing section 87 that connects each of the new crushing hole 83, the crushing hole 83 formed previously, and the groove 79.

In the present embodiment, by repeating the above steps, the concrete member in the lower stage of the dismantling scheduled area 73a of the wall 73 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 dismantling area 73a is divided in order from the lower stage to the upper stage, and the concrete member in the entire dismantling scheduled area 73a of the wall 73 is divided as shown in FIG.

When the divided concrete member is removed by secondary crushing or the like, an opening 73b is formed in the planned dismantling region 73a as shown in FIG. 14 (c). As the secondary crushing, for example, a nibbler claw is inserted into the crack 89 between the concrete members to bite and crush the concrete member, or the tip of the ripper is inserted into the crack 89 and vibrated to crush the concrete member. As described above, the width of the crack 89 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.

It should be noted that 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. In the above example, the concrete member is divided at the lower full width of the planned dismantling region 73a, and then the upper concrete member is divided. After the partial concrete member in the width direction of the dismantling planned region 73a is divided, The upper concrete member may be divided. By repeating this process in the width direction of the planned demolition area 73a, the concrete member in the entire demolition planned area 73a can be divided.

(3. Demolition of pillar 75 and beam 77)
At the time of dismantling the pillar 75 and the beam 77 of the underground structure 71, the ground 72 behind the wall 73 is scraped and removed from the opening 73b formed by dismantling the planned dismantling area 73a of the wall 73. This state is shown in FIG. In the example of FIG. 17A, when the ground 72 is removed, the remaining portion of the lower end portion of the wall 73 is also removed.

In this embodiment, the column 75 and the beam 77 are disassembled with a wire saw, a nibra, or the like, using the space behind the underground structure 71 generated by the removal of the ground 72. For example, in the case of a nibler, as shown in FIG. 17 (b), the front and back surfaces of the column 75 can be grasped with the claws 91, and the column 75 can be crushed at once and crushed. The same applies to the case of the beam 77. As shown in FIG. 17C, the front and back surfaces of the beam 77 can be grasped by the claws 91 and can be broken at a time.

In the case of a wire saw, the horizontal cross section of the pillar 75 can be cut at a time by the wire 93 turned to the back of the pillar 75 as shown in FIG. In the case of the beam 77 as well, the vertical cross section of the beam 77 can be cut at a time by the wire 93 turned behind the beam 77 as shown in FIG. By using a nibra or wire saw, noise and vibration can be kept small.

Thus, according to the present embodiment, the wall 73, which is a plate-shaped concrete member in the vertical direction, can be disassembled with a small number of perforations without using large heavy machinery. In addition, since pressure is applied from the crushing hole 83 above the groove 79 and the concrete member is pushed down and divided, the divided concrete member settles down by its own weight, and the crack 89 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 the present embodiment, the wall 73 is disassembled first, so that the ground 72 behind the wall 73 can be removed, and the columns 75 and the beams 77 can be easily disassembled using the space. The workability of the 71 dismantling work is improved.

In the present embodiment, after the crushing hole 83 is drilled, the procedure of dividing the concrete member by applying pressure from the crushing hole 83 is repeated, and a new crushing hole 83 is formed at an appropriate place while considering the state of crushing. There is an advantage that can be perforated. However, all the necessary crushing holes 83 can be previously drilled.

In addition, the number and position of the crushing holes 83 and the dismantling procedure of the dismantling scheduled area 73a are not limited to those described above. These can be set to be optimal according to the conditions of the dismantling scheduled area 73a. Further, the range of the planned dismantling area 73a is not limited to that described above. For example, only the upper half of the wall 73 may be the dismantling scheduled area 73a. Also in this case, the groove 79 is formed below the planned dismantling region 73a, and the concrete member in the dismantling planned region 73a can be disassembled 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 73 described above, and may be a plate member in the vertical direction.

Also, the method for disassembling the column 75 and the beam 77 is not limited to the above. For example, in the example of FIG. 18A, the mountain retaining wall 72a exists behind the underground structure 71, and the ground 72 cannot be removed even after the dismantling planned area 73a of the wall 73 is dismantled. The inner surface of the column 75 exposed by disassembling and removing 73a and the surface opposite to the inner surface can be gripped by the claw 91, and the horizontal section of the column 75 can be broken by the nibler. Also in the case of using a wire saw, as shown in FIG. 18 (b), a core hole 75a penetrating the column 75 is drilled from the inner surface of the column 75 exposed by removing the planned disassembly region 73a, and the wire passed through the core hole 75a. The horizontal section of the pillar 75 can be cut by 93. The same applies to the beam 77.

As described above, even when the ground 72 behind cannot be removed due to the existence of the mountain retaining wall 72a or the like, the column 75 or the beam 77 is bitten or cut at a time by the removal of the planned dismantling area 73a of the wall 73. It is possible to widen the area that can be done, improving the workability of dismantling work.

The embodiment of the present invention has been described above with reference to the accompanying drawings, but the technical scope of the present invention is not affected by the above-described embodiment. 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.

3, 73a ......... Dismantling scheduled area 5 ......... Opening part 13 ......... Intermediate area 14 ......... Fracture

glass

15, 37 ......... Hydraulic crusher 19, 61 ......... Continuous core holes 21, 25, 33 , 33a, 33b, 53, 83 .........

Fracture hole

23, 27, 34, 55, 87 .........

Split section

41, 51 ......... Core hole 71 .........

Underground structure

72, 101 ......... Ground 73 ……… Wall 75 ……… Column 77 ……… Beam 79 ……… Groove 89 ……… Crack 103 ……… Existing structure 105 …… Pressure panel

Claims

A dismantling method for dismantling a concrete member,
A step (a) of forming openings at intervals in the planned dismantling region of the concrete member;
Applying pressure from a crushing hole drilled in a concrete member in an intermediate region between the openings, extruding the concrete member in the direction of the opening (b),
Comprising
The dismantling method characterized by repeating the step (b) and dividing the concrete member in the intermediate region in order from each opening side.
The demolition method according to claim 1, wherein, in the step (b), pressure is applied to the concrete member using a hydraulic crusher.
In the step (a),
A plurality of core holes form a continuous core hole,
Extruding the concrete member in the direction of the continuous core hole from the crushing hole drilled around the continuous core hole, dividing the concrete member,
The dismantling method according to claim 1 or 2, wherein the divided concrete member is removed.
In the step (a),
From the crushing hole drilled diagonally in the vertical plane, the concrete member is extruded in the direction of the surface of the concrete member, and the concrete member is divided.
The dismantling method according to claim 1 or 2, wherein the divided concrete member is removed.
In the step (a),
3. The disassembly method according to claim 1, wherein a core hole having a diameter over the entire width of the planned disassembly region is drilled.
In the step (a),
Drilling a core hole having a diameter smaller than the entire width of the planned dismantling area,
Extruding the concrete member in the direction of the core hole from the crushing hole drilled at both ends in the width direction of the planned dismantling region, to sever the concrete member,
The dismantling method according to claim 1 or 2, wherein the divided concrete member is removed.
In the step (a),
The disassembling method according to claim 1, wherein a plurality of core holes form continuous core holes continuous over the entire width of the dismantling scheduled region.
The dismantling method according to any one of claims 1 to 7, wherein the concrete member is a pressure-resistant panel of a structure.
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;
Applying pressure from a crushing hole drilled above the groove by a hydraulic crusher, extruding the concrete member downward and dividing the concrete member (b);
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 9, wherein after dismantling the dismantling scheduled area of the underground wall, dismantling the underground pillar or underground beam.
The dismantling method according to claim 10, wherein the dismantling scheduled area of the underground wall is dismantled, the ground behind the underground wall is removed, and then the underground pillar or underground beam is dismantled.