JP2015203215A - Curing unit and dismantling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a curing unit which can alleviate noise and prevent crushed debris from scattering and is easily installed.SOLUTION: A curing unit 19 comprises: an outer shell 24 which has an open lower end; a weight 33 suspended in the outer shell 24; and a wire 27 to suspend the outer shell 24. When the curing unit 19 is lowered onto a cast-in-place pile 1 by being suspended through the wire 27 in preparation for crushing and demolishing excess concrete 3 of the cast-in-place pile 1, the weight 33 is placed on the excess concrete 3 and the outer shell 24 is installed so as to cover the periphery of the excess concrete 3. Then, the excess concrete 3 is crushed with a demolition agent.

Description

  The present invention relates to a curing unit and a dismantling method used when dismantling a structure.

  Underground piles such as foundation piles may be constructed by site construction. An example of on-site creation of piles is shown in FIG. In this example, after excavating the ground 100 as shown in FIG. 9 (a) to form the hole 101, a reinforcing bar 102 is installed in the hole 101 as shown in FIG. 9 (b). The concrete 103 is placed as shown in FIG.

  When the concrete 103 is placed, the concrete placed first as shown in FIG. 9 (d) rises and becomes piled concrete 103a. Although the pile is formed by the hardening of the concrete 103, the surplus concrete 103a contains impurities such as soil that existed at the bottom of the hole 101 and cannot be formed into a structure. Therefore, it is necessary to disassemble and remove it. In this example, after excavating the ground 100 around the pile head as shown in FIG. 9 (e), the surplus concrete 103a is dismantled and removed on the ground as shown in FIG. 9 (f).

  As a method for dismantling the surplus concrete, Patent Document 1 describes a method for dismantling using a crushing agent such as explosives or explosives. In this method, vertical and lateral charge holes are drilled in the surplus concrete, and a crushing agent is loaded into these charge holes. Then, the surplus concrete is crushed by blasting the crushing agent.

JP 50-120103 A

  When crushing using explosives, explosives and other crushing agents, a large noise is generated. In addition, the crushed glass may be scattered. Conventionally, in order to prevent these, crushing was performed after covering with a sheet, but there is a need for a simple and effective curing method that not only covers the sheet but also more effective.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a curing unit or the like that can reduce noise and prevent the shattering of glass from scattering and can be easily installed.

  A first invention for achieving the above-described object is a curing unit for use in dismantling a structure, and includes an outer skin portion having an opening on a lower surface, a weight suspended inside the outer skin portion, and the outer skin portion. It is a curing unit characterized by comprising a suspension material for suspending.

  By hanging the curing unit of the first invention and placing a weight on the structure to be dismantled and covering its periphery with an outer skin, it prevents noise and shattering of the shatter that occur when the structure is crushed it can. In addition to covering the structure with the outer skin part and placing the weight on the structure to suppress the structure, the effect of preventing the shattering glass from scattering is high and the effect of preventing noise can be expected. The weight and the outer skin can be arranged at a time by hanging the curing unit, and can be easily installed and replaced on the structure to be dismantled.

The outer skin portion has, for example, a double membrane structure.
If the outer skin part of the double membrane structure is used, the outer skin part can be easily made independent by injecting air into the inner space of the double membrane structure during use. When not in use, the curing unit can be stored by evacuating the air.

Further, the weight is preferably one in which a fluid is stored in a bag. The fluid is, for example, sand.
If a fluid is used as the weight, the weight fits the surface shape of the structure to be dismantled, and the effect of preventing shattering dust and noise is great. In particular, if sand is used, a sufficient weight as a weight can be easily obtained.

The second invention suspends a curing unit comprising an outer skin portion having an opening on a lower surface, a weight suspended inside the outer skin portion, and a suspension member for hanging the outer skin portion, and In this dismantling method, the structure is crushed after placing a weight and disposing the outer skin portion around the structure.
The structure is, for example, extra-concrete concrete at a pile head of a field-built pile.

  ADVANTAGE OF THE INVENTION According to this invention, a curing unit etc. which can reduce noise, can prevent scattering of crushing glass, and can be easily installed can be provided.

The figure which shows the field construction pile 1 The figure which shows the dismantling method of surplus concrete 3 The figure which shows the dismantling method of surplus concrete 3 The figure which shows the curing unit 19 The figure which shows installation of the curing unit 19 The figure which shows the curing unit 19a, 19b, 19c The figure which shows installation of the curing unit 19c The figure which shows the curing unit 19d Figure showing an example of on-site creation of piles

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

[First embodiment]
(1. Field-built pile 1)
FIG. 1 is a diagram illustrating an on-site creation pile 1 including surplus concrete that is a structure to be dismantled in the present embodiment.

  The site construction pile 1 is formed by building a reinforcing bar 25 in a hole 2 formed in the ground and placing concrete in the same manner as described in FIG. FIG. 1 shows the stage where the pile head is exposed to the ground by digging up the surrounding ground after the concrete is hardened, as in FIG. 9 (e).

  As shown in FIG. 1, the pile head portion of the site-constructed pile 1 includes extra concrete 3 and structural concrete 27 below the extra concrete 3 used as the pile, and the main reinforcement of the reinforcing bar 25 on the outer periphery. 7 is buried.

(2. Dismantling method)
In this embodiment, said surplus concrete 3 is demolished using a crushing agent, and the curing unit mentioned later is used in that case. Hereinafter, a method for dismantling the surplus concrete 3 will be described.

(2-1. Charge to surplus concrete 3)
In the present embodiment, from the state shown in FIG. 1, first, concrete is drilled to form a small-diameter charge hole, and a crushing agent is charged. FIG. 2 shows a state in which the charge holes 9 and 37 are formed.

  A plurality of charge holes 37 are formed by drilling downward from the upper surface of the surplus concrete 3. The charge holes 37 are arranged concentrically on the upper surface of the surplus concrete 3, for example.

  The charge hole 9 is formed in the boundary surface 5 between the extra-concrete concrete 3 and the structural concrete 27 below it. A plurality of charge holes 9 are formed in the horizontal direction from the concrete side surface toward the center of the concrete.

  Thereafter, the charging holes 37 and 9 are charged with a crushing agent. Here, the crushing agent is a high-energy substance such as an explosive, an explosive, or a non-explosive crushing agent, which generates an explosion shock wave or gas pressure by ignition (detonation), thereby crushing the object. Explosive shock waves are generated in the case of explosives, and gas pressure is generated when explosives and non-explosive crushing agents are used.

(2-2. Curing of surplus concrete 3)
Subsequently, as shown in FIG. 3, the periphery of the surplus concrete 3 is covered with a high-strength sheet 40 such as an aramid fiber sheet. Then, the wire 41 is wound around the sheet 40 and fixed.

  Further, in this embodiment, a curing unit is installed to prevent noise during crushing of the surplus concrete 3 and scattering of crushing glass.

  FIG. 4 is a diagram showing the curing unit 19. FIG. 4A is an elevation view of the curing unit 19. FIG. 4B is a vertical sectional view taken along line CC in FIG. FIG. 4C is a cross-sectional view in the horizontal direction along the line DD in FIG.

  As shown in FIG. 4, the curing unit 19 includes an outer skin portion 24, a wire 27, a weight 33, and the like.

  The outer skin portion 24 has a shape in which a conical weight-like portion 23 is integrated above the cylindrical tubular portion 21, and an opening 22 is provided on the lower surface. The outer skin portion 24 has a bag-like double membrane structure composed of inner and outer double membranes 35 a and 35 b and is self-supporting by injecting air into the inner space 34. A reinforcing cloth (not shown) may be attached to the inner film 35b. Thereby, the noise prevention effect and the shattered glass scattering preventing effect can be improved, and damage to the film 35b due to the shattered glass can be prevented.

  The wire 27 is a suspension member for suspending the outer skin portion 24, and the middle portion is attached to the outer skin portion 24 by the attachment portion 25. Moreover, the wire 27 penetrates the upper part of the outer skin part 24, and the weight 33 is attached to a lower end part. In addition, the suspension material should just be for suspending the outer skin part 24, and is not restricted to a wire.

  The weight 33 is suspended inside the outer skin portion 24 by the wire 27. As the weight 33, a bag body containing sand which is a fluid is used.

  In the present embodiment, the outer skin portion 24 and the weight 33 are suspended by the wire 27, but the wires for suspending the outer skin portion 24 and the weight 33 may be different. Further, the weight 33 may be anything as long as it has a sufficient weight, and for example, a steel plate or the like can be used.

  FIG. 5 is a diagram illustrating the installation of the curing unit 19. After the curing unit 19 injects air into the inner space 34 of the outer skin portion 24, the curing unit 19 is hung by the wire 27 from above the site-built pile 1 using a lifting machine such as a crane as shown in FIG.

  When the curing unit 19 is lowered, the weight 33 is placed on the upper surface of the surplus concrete 3 as shown in FIG. 5B, and the outer skin portion 24 is disposed so as to cover the periphery of the surplus concrete 3. . FIG. 5B is a diagram showing a vertical cross section similar to FIG. 4B, and illustration of the charge holes and the like of the surplus concrete 3 is omitted.

  If necessary, a fixing material such as a weight or a holding member is provided on the lower edge of the outer skin portion 24 to fix the position of the curing unit 19, or air is injected into the inner space 34 of the outer skin portion 24 with a compressor or the like. It is also possible to reliably maintain the state.

  After installing the curing unit 19 in this way, after blasting the crushing agent in the charge hole 9 (see FIG. 2) and dividing the surplus concrete 3 and the structural concrete 27 of the site-built pile 1 at the boundary surface 5 up and down Then, blasting of the crushing agent in the charge hole 37 (see FIG. 2) is performed in order from the outside to the inside, and the surplus concrete 3 is crushed.

  The noise at the time of blasting and the scattering of crushed glass are reduced by suppressing the surplus concrete 3 from above by the weight 33 of the curing unit 19 and covering the periphery of the surplus concrete 3 with the outer skin portion 24.

  After the crushing of the surplus concrete 3 is completed in this way, the curing unit 19 is lifted and removed, the crushing glass and the like are removed, and the dismantling of the surplus concrete 3 is completed.

  Thus, according to this embodiment, the curing unit 19 is suspended from the surplus concrete 3, the weight 33 is placed on the surplus concrete 3, and the periphery of the surplus concrete 3 is covered with the outer skin portion 24. The noise generated by crushing the surplus concrete 3 and the shattering of shattered glass can be prevented. In addition to covering the extra-concrete concrete 3 with the outer skin part 24 and placing the weight 33 to suppress the extra-concrete concrete 3, the effect of preventing the shattered glass from scattering is high and the effect of preventing noise can be expected. The weight 33 and the outer skin portion 24 can be arranged at a time if the curing unit 19 is suspended, and can be easily installed and replaced on the surplus concrete 3.

  Moreover, by making the outer skin part 24 into a bag-like double membrane structure, the outer skin part 24 can be easily made independent by injecting air into the inner space 34 when the curing unit 19 is used. When not in use, the curing unit 19 can be stored with the air removed, and no space is required.

  Further, since the weight 33 is made of sand that is a fluid and stored in a bag, the weight 33 fits the surface shape of the extra-concrete concrete 3 so that the extra-concrete concrete 3 can be suppressed evenly. The prevention and scattering prevention effect is great. A liquid such as water can be used as the fluid, but a sufficient weight as the weight 33 can be easily obtained by using sand.

  However, the present invention is not limited to this. For example, the method of dismantling the surplus concrete with the crushing agent is not limited to the above, and the type of crushing agent and the placement of the charge holes take into consideration various conditions such as the diameter of the on-site pile 1 and the height of the surfacing concrete 3 To be determined appropriately. In any case, the above curing unit 19 is applicable.

  Further, the shape and structure of the curing unit are not limited to those described in the first embodiment. FIG. 6 is an example in which the shape of the curing unit is different. For example, in the curing unit 19a of FIG. 6 (a), the outer skin portion 24a is integrated with a pyramid-shaped pyramidal portion above the rectangular tubular portion. Has a shape.

  In the curing unit 19b shown in FIG. 6B, the outer skin portion 24b has a shape in which a hemispherical dome portion is integrated above a cylindrical tubular portion. In the curing unit 19c shown in FIG. 6C, the outer skin portion 24c has a quadrangular pyramid shape.

  Further, in the present embodiment, as an application example of the curing unit 19, the dismantling of the surplus concrete 3 at the pile head of the on-site created pile 1 has been described. In-situ piles 1 are often formed with a large number of the same shape, and when the curing unit 19 that is easy to install is used as in this embodiment, the curing unit 19 can be easily replaced and is particularly effective.

  However, the application target of the curing unit 19 is not limited to the demolishing of the surplus concrete 3, but can be applied to the dismantling of various structures including underground foundations such as foundation beams, deep foundation piles, and pressure plates. For example, FIG. 7 shows a case in which the foundation beam 8 which is an underground frame is crushed using a crushing agent and disassembled, but in this case as well, a similar curing unit can be applied.

  The example of FIG. 7 is an example using the curing unit 19c, and the weight 33 is placed on the crushing portion 8a of the foundation beam 8 by hanging the curing unit 19c as in the first embodiment, and the crushing portion The outer skin part 24c can be arrange | positioned around 8a, and the noise at the time of crushing and scattering of crushing glass can be prevented. Moreover, since the curing unit 19c is hung from the top and installed, the installation work is easy even when the underground building is dismantled. 7 is a view showing a vertical cross section similar to that in FIG. 4B, and illustration of the charging holes and the like of the foundation beam 8 is omitted.

[Second Embodiment]
FIG. 8 is a diagram showing a curing unit 19d of the second embodiment. This curing unit 19d has a soundproof sheet 42 (as shown in FIG. 8B) on the side surface and upper surface of a single tube Yakura 43 (frame body) in which single tubes as shown in FIG. The outer skin portion 24d is formed by providing a covering material.

  The wire 27 is attached to the single pipe arrow warehouse 43 of the outer skin part 24d in the middle part. Moreover, the wire 27 penetrates the upper part of the outer skin part 24d, and a weight (not shown) is attached to a lower end part. As a result, the weight is suspended inside the outer skin portion 24d.

  This curing unit 19d can also be used in the same manner as in the first embodiment, and the same effect as in the first embodiment can be obtained. Further, the curing unit 19d has an advantage that the outer skin portion 24d can be easily formed by using materials on the construction site. In this embodiment, the sound insulation sheet 42 is covered with the single pipe arrow 43 to form the outer skin part 24d. However, the structure of the outer skin part 24d is not limited to this, and for example, a frame is used instead of the single pipe arrow warehouse 43. A scaffold or the like can also be used, and a soundproof panel or the like may be used for covering instead of the soundproof sheet 42.

  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. It is understood that it belongs.

1 ... …… Site-built piles 3 ... Additional concrete 8 ... Base beams 19, 19a, 19b, 19c, 19d ... Curing units 24, 24a, 24b, 24c, 24d ... Outer skin 27 ... …… Wire 33 ……… Weights 35a, 35b ……… Membrane

Claims (6)

A curing unit used for dismantling the structure,
An outer skin portion having an opening on the lower surface;
A weight suspended inside the outer skin part;
A suspension material for suspending the outer skin part;
A curing unit comprising:   The curing unit according to claim 1, wherein the outer skin part has a double membrane structure.   The curing unit according to claim 1 or 2, wherein the weight is one in which a fluid is stored in a bag.   The curing unit according to claim 3, wherein the fluid is sand.   An outer skin part having an opening on the lower surface, a weight suspended inside the outer skin part, and a curing unit comprising a suspension material for hanging the outer skin part are suspended, and the weight is placed on a structure. A dismantling method, wherein the structure is crushed after the outer skin portion is disposed around the structure.   The dismantling method according to claim 5, wherein the structure is a pile-up concrete of a pile head of a field-built pile.

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