JPH07300861A - Method for constructing large-scale underground frame - Google Patents

Abstract

PURPOSE:To shorten the construction period, facilitate the construction work and reduce the cost. CONSTITUTION:In a construction method wherein a large-scale underground frame 2 is constructed on the ground beforehand in such a manner that edges of blades for settling are projected from under the frame 2, so that the ground 1 is excavated in a space 3 formed by the edges of blades to settle the frame 2, edges of the blades 4 are provided under the outer periphery of the frame 2. Furthermore inner edges of blades 4a are provided inside the underside of the frame 2 to settle the frame 2 on the ground 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a large-scale underground skeleton part on the ground in advance, and then digging the ground to dig the caisson of the underground skeleton part to construct an underground skeleton. .

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, a method of constructing an underground skeleton is to form a caisson 2 having a cutting edge 4 on an outer peripheral portion of the skeleton on a ground 1, and in a working space 3 under the skeleton The caisson 2 is sunk to a predetermined depth while excavating the ground and excavating the excavated earth and sand with a carrying-out means such as a grab bucket.

[0003]

However, in the above-mentioned construction method, when the length of the body of the caisson 2 is small, the laying work can be performed relatively easily. For example, the length of the body is 25 m. In the case of the above large-scale caisson, there is a problem that reinforcement work is required to prevent distortion of the skeleton, the construction period is prolonged, and the reinforcement work takes time and costs are increased. there were.

As described above, in order to construct an underground skeleton by sinking a conventional large-scale caisson, it is necessary to reinforce the underground skeleton, and there is a problem to be solved in terms of construction period and cost. The present invention has been made in view of the above problems, and an object thereof is to provide a construction method for shortening the construction period, facilitating construction, and reducing costs.

[0005]

Means for Solving the Problems The object of the present invention to solve the above problems and achieve the above objects is to provide a large-scale underground skeleton on the ground, and to project a blade for sinking into the lower part of the underground skeleton. In advance, built in, in the construction method of excavating the ground in the working space formed by the blade tip and submerging the underground skeleton, with the blade edge provided on the outer peripheral part of the lower part of the underground skeleton, also inside the lower part of the underground skeleton This is a construction method in which an internal cutting edge is provided and the underground structure is submerged in the ground.

A pulling means for sinking is arranged in the vicinity of the internal cutting edge, and a temporary reinforcing wall is provided on the internal cutting edge.

[0007]

According to the present invention, in the case of constructing a large-scale caisson and submerging it in the ground, a double structure of the lower cutting edge provided on the lower part of the underground building and the inner cutting edge provided on the outer peripheral portion of the building By providing the blade edge, the large-scale underground skeleton is supported at its intermediate portion, and even an underground skeleton with a long span can be sunk without special reinforcement work.

If a pulling means for sinking is arranged in the vicinity of the inner cutting edge provided on the inner side, or if a temporary reinforcing wall is provided on the inner cutting edge, a large scale is provided. It is possible to evenly lay down underground structures,
The temporary reinforcement wall prevents distortion of the underground structure and improves the efficiency of the laying work.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, one embodiment according to the present invention will be described in detail with reference to the drawings. The parts corresponding to those of the conventional example will be described with the same reference numerals for easy understanding.

In the method of constructing a large-scale underground skeleton according to the present invention, as shown in FIG. 1 (a), the caisson 2 of the underground skeleton portion is previously constructed on the ground 1.

The caisson 2 is formed by providing a cutting edge 4 on the outer peripheral portion of the lower part of the body and further providing an internal cutting edge 4a on the inner side of the lower part.

When constructing each floor of the caisson 2, as shown in FIG. 2, a wall is provided when the central portion of the body is the core portion 2a of an elevator or stairs. As shown in FIG. 3, a temporary reinforcing wall 2c, which is a PC plate or the like that can be freely attached and detached with bolts or the like, is provided in a portion having a long span in a portion without such a wall.

Further, as shown in FIG. 1B, while controlling a large caisson 2 by a control device or the like (not shown), the whole body is uniformly sunk to prevent uneven settlement. The required number of ground anchors 5 are arranged.

The ground anchor 5 is provided in the vicinity of the internal cutting edge 4a in order to avoid deformation of the beam due to a reaction force. Further, the pulling means for pulling the ground anchor 5 and sinking the underground structure 2 by its reaction force is, for example, a center hole type hydraulic jack 6 provided at the anchor end portion.

In this way, the caisson 2 for the underground structure
After preliminarily constructed on the ground, excavating work in the work space 3 to discharge the earth and sand, and while pulling the ground anchor 5 uniformly by the hydraulic jack 6 under automatic control,
The underground structure 2 is sunk to a predetermined depth.

The caisson 2 includes the internal cutting edge 4a,
The temporary reinforcement wall 2c prevents the distortion of the skeleton body and keeps the skeleton body firmly, and is laid down.

After the caisson 2 is laid down,
The temporary reinforcing wall 2c is removed by removing bolts and the like.

[0018]

As described above, the method for constructing a large-scale underground skeleton of the present invention is constructed in advance by placing a large-scale underground skeleton on the ground and projecting a blade edge for sinking at the bottom of the underground skeleton. Then, in the construction method of excavating the ground in the working space formed by the blade edge and submerging the underground skeleton, with the blade edge provided on the outer peripheral portion of the lower portion of the underground skeleton, an internal blade edge is also provided inside the lower portion of the underground skeleton. Since it is provided and the underground structure is submerged in the ground, the doubled cutting edge of the outer peripheral edge and the internal edge prevents the occurrence of distortion in the underground structure with a long span, thus enabling a large-scale underground structure. It has an excellent effect that it can be sunk and the construction such as reinforcement work for preventing the occurrence of distortion can be omitted to reduce the cost and the construction period.

Further, a pulling means for sinking is provided in the vicinity of the internal cutting edge, and further, on the internal cutting edge,
Since it was decided that a temporary reinforcement wall was provided, not only can a large-scale underground structure be sunk in the ground uniformly, but also a large-scale underground structure can be reinforced by only reinforcing a part of it. It has the excellent effect of improving the reliability and safety of the digging work.

[Brief description of drawings]

FIG. 1 is explanatory diagrams (a) and (b) showing a state in which a caisson of an underground skeleton portion is preliminarily constructed on the ground according to a large-scale underground skeleton construction method according to the present invention.

FIG. 2 is a plan view of the underground structure.

FIG. 3 is a vertical cross-sectional view showing a state in which the large-scale caisson is submerged in the ground.

FIG. 4 is an explanatory diagram showing a method of constructing an underground skeleton by sinking a caisson according to a conventional example.

[Explanation of symbols]

 1 ground, 2 caisson, 2c temporary reinforcement wall, 3 working space, 4 cutting edge, 4a internal cutting edge, 5 ground anchor, 6 hydraulic jack.

Claims (3)

[Claims] 1. A large-scale underground skeleton is constructed on the ground by preliminarily constructing a blade edge for sinking at a lower portion of the underground skeleton, and the ground is excavated in a working space formed by the blade edge to remove the underground skeleton. In the construction method of sinking, a large-scale underground skeleton characterized in that a blade edge is provided on the outer peripheral part of the lower part of the underground skeleton, and an internal cutting edge is also provided inside the lower part of the underground skeleton, and the underground skeleton is sunk in the ground. How to build. 2. The method for constructing a large-scale underground skeleton according to claim 1, wherein a tensioning means for sinking is arranged in the vicinity of the internal cutting edge. 3. The method for constructing a large-scale underground structure according to claim 1, wherein a temporary reinforcing wall is provided on the internal cutting edge.