JPH0960311A - Lift-up demolition method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To safely and rapidly demolish a structure constructed in the ground without use of heavy equipment in a narrow space of the underground and retaining walls therein to remarkably increase the demolishing work efficiency. SOLUTION: The piles 3 of a structure to be demolished are cut near the pile head in advance and a plurality of supports 5 are driven to pierce the structure 2 in the underground and the lower parts of supports are anchored in the bearing ground 6. The structure 2 is separated from the peripheral ground 4 to release the friction force. And then, the structure 2 is lifted up to the ground surface, taking the reactive force on the supports 5 by jacks 8 and hanging materials 9. The space formed under the structure 2 by lifting up it is filled back with a filler like soil cement 11 and the structure exposed on the ground surface is demolished on the ground.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lift-up dismantling method for dismantling a concrete structure constructed underground.

[0002]

2. Description of the Related Art Conventionally, it is difficult to dismantle concrete structures constructed underground from the ground surface, so dismounting machines such as nibblers and giant breakers are placed inside the underground structure to achieve the desired structure. It is dismantled. Moreover, when dismantling a concrete structure constructed deep underground, it is necessary to construct a retaining wall to prevent the deformation of the surrounding ground. In order to construct this cliff wall, a machine such as a rock auger or casing drive (hereinafter referred to as CD) is used, and the underground concrete structure must be partially dismantled from the ground surface prior to this dismantling. I won't.

[0003]

However, in the conventional method for dismantling an underground concrete structure as described above,
There were the following problems.

(1) Narrow work area Since it is a dismantling work in the underground, it can be dismantled only from the inside of the structure, the work space is narrow, the work efficiency is lowered, and the work environment is bad. When constructing a mountain retaining wall, mountain retaining supports, piles supporting the supports, gantry piles,
Alternatively, true columns (in the case of reverse striking) are provided, and they divide the work space finely, so that the range in which heavy machinery can move is further limited.

(2) Since it takes a lot of time to replace machines, it is difficult to put a plurality of machines (such as giant breakers, nibblers and backhoes) into the dismantling work area at a time because the work area is small. After that, you have to replace other machines, which is troublesome.

(3) Preliminary work is required when constructing a cliff wall. If the object to be dismantled is constructed deep underground, in order to prevent the deformation of the surrounding ground, a cliff wall is required. However, at this time, it is necessary to dismantle the portion of the underground structure that constructs the retaining wall using a rock auger or a CD. In addition, it is necessary to put these machines and the earth retaining wall construction machine on the underground structure, but because of the large weight,
Due to the structure of the underground structure, it cannot be placed directly on the underground structure. Therefore, it is necessary to dismantle the slab of the underground structure and refill the underground space surrounded by the underground structure with earth and sand.

(4) It takes time and labor to dismantle the underground structure only from one direction (inside). Since it can be dismantled underground, it can only be dismantled from the space surrounded by the underground structure, making it difficult to grasp with a nibler. , It takes time to dismantle.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to dismantle an object to be dismantled constructed underground, by a heavy machine in a narrow underground space and a mountain. It is an object of the present invention to provide a lift-up method capable of completely eliminating the construction of a stop wall, significantly improving the efficiency of dismantling work, and performing safe and quick dismantling.

[0009]

DISCLOSURE OF THE INVENTION The present invention is designed to expose an object to be dismantled constructed underground to the ground before dismantling and dismantle it on the ground. That is, if there is a ground structure, dismantle the ground structure, then cut the piles of the dismantling object in the vicinity of the pile head in advance, place a plurality of columns through the underground object to be demolished, and lower the column. After fixing the ground to the supporting ground and releasing the frictional force between the underground object to be demolished and the surrounding ground, a reaction force is applied to the pillar by a jack-up mechanism consisting of a jack and hoisting material, and the underground object to be demolished is grounded. It is characterized in that it is lifted up and dismantled and the space formed under the dismantling object underground is backfilled with a filling material such as soil cement.

[0010] The underground dismantling object is dismantled on the ground by the dismantling machine when the underground dismantling object is completely lifted up to the ground or during the lift-up.

(1) It is possible to dismantle on the ground,
The work area is wide, and the object to be disassembled can be disassembled from various angles. Also, since the space under the lifted-up underground demolition object is backfilled with cement milk, etc., the conventional mountain retaining wall is not required, and the mountain retaining support work, piles supporting the support work, and gantry piles are eliminated. There is no limit to the space in which heavy machinery can move. (2) Since it is dismantled on the ground, the work area becomes wider and it is not necessary to replace the weight dismantling machine. (3)
Since the retaining wall is not required, preliminary work for constructing the retaining wall is eliminated. (4) Since there is no part in contact with the soil (except for the lower end), it can be easily dismantled from all directions and efficient dismantling can be performed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment shown in the drawings. This is an example applied to a concrete structure having an underground portion and an above-ground portion, and such a concrete structure is dismantled by the following procedure (see FIGS. 1 to 5).

The ground structure 1 is disassembled to the ground surface by a conventional method using a weight dismantling machine.

After partially dismantling the slab 2a around the pile 3 in the underground concrete structure 2 and excavating the upper ground 4 to expose the pile head, the exposed pile head portion is cut with a wire saw or the like, Alternatively, the edge between the underground concrete structure 2 and the pile 3 is cut by cutting the underground beam, the bottom plate or the like to separate from the pile 3.

A pillar 5 for jacking up, which will be described later, is pierced through the underground concrete structure 2 and driven up to the lower supporting ground 6. The support column 5 has a strength H sufficient to withstand a reaction force applied when jacking up, which will be described later.
Multiple pillars such as shaped steel are used, and a plurality of them are arranged at appropriate positions in the underground concrete structure. In addition, the upper part of the pillar 5 is projected from the upper part of the underground concrete structure 2 with a sufficient length, and the lower part is fixed to the lower ground 6 having sufficient strength to withstand the reaction force, or a pile suitable for the purpose is provided. Support.

[0016] If necessary, the ground under the existing basement may be improved depending on the strength of the ground.

The upper ground 4 in the outer peripheral portion of the underground concrete structure 2 is excavated by a water jet 7 or the like,
Cut the edge between the underground concrete structure 2 and the upper ground 4,
The frictional force between the underground concrete structure 2 and the upper ground 4 is released.

The jacks 8 are fixed to the upper ends of the columns 5, and the lower ends of the hoisting members 9 such as wire ropes and step rods provided on the jacks 8 are fixed to the underground concrete structure 2.

As the jack 8 and the lifting material 9, for example, a center hole jack (up / down jack) and a step rod are used. Center hole jack 8
Has an upper grasping claw at the tip of the piston rod and a lower grasping claw at the base of the jack which are automatically attached to and detached from the engaging concave-convex portion of the step rod 9. Step rod 9 with gripping claw
The upper grip claw is lowered in a state where the step rod 9 is supported, and the step rod 9 is jacked up in a lengthwise manner by sequentially repeating such expansion and contraction of the jack.

The step rod 9 and the underground concrete structure 2 are fastened to each other by the wall portion 2b of the underground concrete structure.
The connecting steel material 10 is inserted through the above, and both ends of the connecting steel material 10 are fixed to the lower end portions of the pair of step rods 9 via the fasteners.

By driving each jack 8 synchronously, each step rod 9 is jacked up in a lengthwise manner, and the underground concrete structure 2 fixed to the step rod 9 lifts while taking a reaction force to the column 5. I will go up.

Every time the underground concrete structure 2 is lifted up by a predetermined amount, the soil cement 11 is injected into the space formed below the underground concrete structure 2.

When the underground concrete structure 2 is completely lifted up to the ground and the strength of the soil cement 11 filled in the entire underground is developed, the jack 8, the hoisting material 9 such as a step rod, and the pillar 5 are removed. .

The underground concrete structure 2 on the ground is dismantled by the weight dismantling machine 12.

With the above, the dismantling work of the underground concrete structure 2 is completed.

In the above, the example of dismantling the underground concrete structure 2 completely exposed to the ground has been shown, but the present invention is not limited to this, and the underground concrete structure 2 may be in the middle of jacking up.
It is also possible to dismantle. In addition, groundwater pressure or lift by an air bag may be used as an auxiliary lift for the jack. Furthermore, if necessary, a sheet pile or the like can be driven in to cut the edge with the ground.

Further, the concrete structure having the above-ground portion has been described above, but the present invention is not limited to this, and the present invention can be applied to a concrete structure having only an underground portion or an underground structure having another structure. Nor.

[0028]

As described above, according to the present invention, the underground dismantling object, which is cut off from the pile and the surrounding ground, is lifted up to the ground by taking a reaction force to the pillar, and is lifted to the lower part of the underground dismantling object. Backfill the formed space with filling,
Since the underground dismantling object that appeared on the ground was dismantled, it is possible to completely eliminate the conventional dismantling by heavy equipment in the narrow underground space, construction of the mountain retaining wall and preliminary construction of the mountain retaining wall construction, It is possible to dismantle an object to be dismantled underground from any direction in a wide work area on the ground, greatly improve dismantling work efficiency, and perform safe and quick dismantling.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing, in the order of steps, a lift-up method (No. 1) for an underground concrete structure according to the present invention.

FIG. 2 is a cross-sectional view showing a lift-up method (No. 2) for an underground concrete structure according to the present invention in the order of steps.

FIG. 3 is a cross-sectional view showing a lift-up method (No. 3) for an underground concrete structure according to the present invention in the order of steps.

FIG. 4 is a cross-sectional view showing a lift-up method (No. 4) for an underground concrete structure according to the present invention in the order of steps.

FIG. 5 is a cross-sectional view showing a lift-up method (No. 5) for an underground concrete structure according to the present invention in the order of steps.

[Explanation of symbols]

1 ... Ground skeleton, 2 ... Underground concrete structure, 2a ... Slab, 3 ... Pile, 4 ... Upper ground, 5 ... Pillar, 6 ... Lower support ground, 7 ... Water jet, 8 ... Jack, 9 ...
Hoisting material (step rod), 10 ... Connection steel material, 11 ...
Soil cement, 12 ... Weighing machine.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shoji Shimamura 4-51 Otamachi, Naka-ku, Yokohama-shi, Kanagawa Kashima Construction Co., Ltd. Yokohama Branch

Claims (1)

[Claims] 1. A pile of an object to be demolished is cut in advance in the vicinity of the pile head, and a plurality of columns are placed by penetrating an object to be demolished underground, and the lower part of the column is fixed to a support ground to dismantle the underground. After releasing the frictional force between the object and the surrounding ground, a reaction force is applied to the pillars to lift up and dismantle the underground dismantling object to the ground, and the lift-up forms the lower part of the underground dismantling object. Lift-up dismantling method characterized by filling back the filled space with filling material.