JPS6047440B2 - Underground structure construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a construction method for excavating a large underground structure in a transverse direction beneath the ground of a railway, road, etc.

In order to excavate and construct large-scale underground structures in the transverse direction below the ground of railways, roads, etc., without interfering with traffic above, protection of the face is important, and conventional protection against upper loads is important. A separate factory was set up.

The purpose of the present invention is to eliminate the drawbacks of the conventional examples, and to easily protect the face when constructing a large underground structure by excavating it underground with a shallow upper branch such as under a railway or road. The object of the present invention is to provide a method for constructing an underground structure that enables safe and reliable construction, significantly shortens the construction period, and saves a huge amount of construction costs.

Hereinafter, one embodiment of the method of the present invention will be described in the case of constructing a large slab girder with a shallow upper branch in the ground.

As shown in Figures 1 to 5, when the underground structure is a plate-shaped girder 1 and the plate-shaped girder 1 is to be excavated underground (excavation forward), there is an opening at the tip of the front part. Small cylindrical body cutting edge 3 having
A group of small cylindrical blades arranged in parallel is arranged in advance. As for the arrangement method, a holding frame 4 is provided at the front part of the plate-shaped girder 1, and the tip of each small cylinder cutting edge 3 is placed in front of the tip of the holding frame 4.
It was inserted into the holding frame 4 so that it could be combined.

On the other hand, a propulsion jack 6 was disposed within the holding frame 4 at the rear end of the three groups of small cylinder blade openings. In this way, using the propulsion jack 6, the small cylindrical blade openings 3 are advanced one by one to several meters in front of the holding frame 4 by manual or mechanical means to remove earth and sand from the tip opening surface. After this is completed, the plate-shaped girder 1 and the holding frame 4 are advanced by one process length using a conventional construction method such as a propulsion construction method or a towing construction method. Thereafter, one by one, the cutting edges 3 of each group of small cylinder cutting edges 3 are sequentially advanced, and the plate-shaped girder 1 and the holding frame 4 are advanced by one process length, which are alternately repeated until they are advanced to a predetermined position.

In this way, the small cylinder blade opening 3 has a small cross section, and the front part is supported by penetrating into the ground in advance, and the rear part is held by the holding frame, so that the upper load can be supported and protected.

In addition, when the small cylindrical blade opening 3 with a small cross section advances in excavation, the face surface on which the plate-shaped girder 1 should advance is divided into small pieces by the opening surface at the tip of the blade opening 3, so the working face does not collapse and is safe. be. As another example, as shown in FIG.
A holding cylinder 5 may be disposed in the front part of the holding cylinder 5 as a holding plate for holding the three groups of small cylinder cutting edges in a portal shape.

This embodiment is effective when the upper stratum of the cross section of a large box excavation is of collapsible soil quality. Furthermore, as another example, as shown in FIG. 7, the three groups of small cylinder cutting holes and the five groups of holding cylinders that hold the three groups of small cylinder cutting holes may be arranged in a box shape instead of a gate shape. good.

In this example, even if the cross-sectional shape of the box is different, by changing the width or height of several small cylinder blade openings and holding cylinders, the small cylinder and body blade can be adjusted according to the width and height of the box. The mouth group and holding tube group can be arranged, and most of the small cylinder cutting edge group and holding tube group can be reused because it can be related to the floor plate thickness and wall thickness of the case, and the structure is improved. It is easy to assemble, disassemble,
It is also economical because it is easy to transport.

Furthermore, in any of the above embodiments, the tips of each of the elongated friction cutter pieces 2 arranged in parallel on the upper part of the plate-shaped girder 1 are rigidly connected to the front part of the small cylinder cutting edge 3 by welding. If they are integrated, this friction cutter piece 32 will move forward together with each small cylindrical blade opening 3 at the same time, and at this time, the soil on the top of the friction cutter piece 2 will not move laterally, and the soil will be connected to the top of the plate-like girder 1. Since the edges between the gaps are cut by the friction cutter pieces 2, the soil on the upper part of the platform girder 1 does not move when the platform girder 1 moves forward, making it safe.

As described above, the underground structure construction method of the present invention can divide the face to be excavated into small pieces, so there is no need to construct protection works for the underground structure to be excavated in advance as in conventional construction methods. This is an innovative construction method that can be carried out at the same time as the underground structure excavation, safely, reliably, quickly, and cheaply constructing a large underground structure. As shown in Figure 1, after the construction of the slab girder 1, the abutments 7, vias, etc. of the slab girder can be constructed safely and quickly in the lower ground protected by the slab girder 1, and the abutments, vias, etc. can be constructed in advance. It is also possible to construct a shaped girder, and when constructing under embankment, create a slab girder above the abutments, vias, etc., and repeat excavation of the abutments, vias, etc. and excavation of the slab girder alternately. It is useful for a wide range of uses and can be used to construct underground passages for members of the public.

Although the method of the present invention has been described above with reference to examples, it goes without saying that the present invention is not limited to these examples, and various modifications to the design can be made without departing from the spirit of the invention. It's watery.

[Brief explanation of the drawing]

Fig. 1 is a front view of one embodiment of the method of the present invention, Figs. 2 and 3 are side views showing the steps of the embodiment of Fig. 1, and Figs. 4 and 5 are the small cylinder cutting edge and holding. 6 and 7 are front views showing another embodiment of the present invention, and FIG. 8 is a front view showing an application of the present invention. 1...Plate girder, 1''...Case, 2...
・Friction cutter piece, 3...Small cylinder cutting edge, 4...Holding frame, 5...Holding tube, 6
...Propulsion jack, 7...Abat.

Claims (1)

[Claims] 1. When an underground structure is advanced into the ground, it is composed of a small cylindrical blade group having a tip opening surface at the front part and a holding frame that holds the small cylindrical blade group, and each of the small cylindrical blades Each of the cylindrical blade groups is inserted forward from the tip of the holding frame of the small cylindrical blade group and slidably inserted into the holding frame, and a long and thin friction cutter piece is provided at the top of the underground structure. The tip of the group is rigidly connected to the front end of each of the small cylinder blade groups, and the small cylinder blade groups are placed an appropriate distance one by one in front of the tip of the holding frame of the small cylinder blade group. A method for constructing an underground structure characterized by dividing the face into small pieces by sequentially excavating the face to prevent the face from collapsing.