JPS5927833B2 - Underground structure construction method - Google Patents

Description

[Detailed Description of the Invention] The present invention provides a novel method for constructing a large-scale underground structure by excavating it in a transverse direction under the ground of railways, roads, etc. without causing any hindrance to the traffic above. The present invention provides a method.

In order to excavate and construct a large underground structure in a transverse direction under the ground of railways, roads, etc. without interfering with the traffic above, a separate protection against the upper load is conventionally required. Conventional construction methods for upper load receivers include methods such as pipe roofs, construction girders, etc. in which the upper load receiver is completed separately.

In such conventional construction methods, it is not possible to simultaneously construct the upper load receiving ball and the large underground structure, and the two types of T-type structures are constructed separately, which increases the construction cost and construction period, resulting in hardship and economic loss. was a dog.

The purpose of the present invention is to eliminate the drawbacks of conventional construction methods that are subjected to upper loads, and to construct underground structures with shallow earth cover such as under railways and roads, and by excavating large underground structures into the ground. In this case, without separately constructing a protective layer above the underground structure, it is possible to protect the face and prevent the movement of the soil above the underground structure. Since the structure is excavated and moved forward, construction can be done safely and reliably,
The object of the present invention is to provide a method of constructing an underground structure that can significantly shorten the construction period and save a huge amount of construction costs.

Hereinafter, as an example of the method of the present invention, a case of constructing a slab-like girder with a shallow earth cover, a low underground height, and a large width will be described.

As shown in Figures 1 to 5, digging underground (excavation progress)
A holding frame 4 that holds three groups of small cylinder cutting holes and a holding frame 4 that holds the three groups of small cylinder cutting holes is attached to a plate-like girder 1, which is an underground structure, and the tip of each small cylinder cutting hole 3 is the tip of the holding frame 4. They are brought out further forward, slidably inserted into the holding frame 4, and arranged in parallel.

The small cylinder body cutting edge 3 has an opening at the tip as shown in the figure.

On the other hand, the tips of each of the elongated friction cutter pieces 2 arranged in parallel on the upper part of the plate-shaped girder 1 and the front part of the small cylinder cutting edge 3 are rigidly connected by welding to be integrated.

Furthermore, a propulsion jack 6 is disposed within the holding frame 4 at the rear end of the three groups of small cylinder blade openings.

In this way, the propelling jack 6 sequentially moves the small cylindrical body cutting edge 3 and the friction shaft rigidly connected thereto.
The cutter pieces 2 are moved forward to excavate several meters in front of the holding frame 4 by hand or machine to remove earth and sand from the front end surface, and after finishing, the plate-shaped girder 1 and the holding frame 4 are moved forward.
is advanced by one process length using conventional construction methods such as propulsion method and towing method.

Thereafter, the three groups of small cylinder cutting edges and the two groups of friction cutter pieces rigidly connected thereto are sequentially excavated and advanced,
Advancement of the plate-shaped girder 1 and the holding frame 4 by one step length is repeated alternately to advance them 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.

Further, when the small cylindrical body cutting edge 3 having a small cross section moves forward in excavation, the face does not collapse and it is safe.

The width of the friction cutter pieces 20 welded to the front part of the small cylinder cutting edge 3 is narrow, and each piece is advanced one by one with each small cylinder cutting edge 3, so when the friction cutter pieces 2 move forward, the friction cutter The soil on the top of the slab girder 1 does not move laterally, and there is friction between the upper part of the slab girder 1 and the soil, and the edge is cut by the cutter piece 2 and becomes cold, so when the slab girder 1 moves forward, the upper part of the slab girder 1 It is safe because the soil does not move.

Furthermore, the peripheral frictional resistance force required for the advancement of the plate-shaped girder 1 and the holding frame 4 is suppressed by the fact that the upper part is covered with the friction cutter piece 2 (
・Since the three groups of small cylindrical cutting edges are excavated and advanced in advance, the plate-like girder 1 and the holding frame 4 can be advanced with a small force (no resistance force is needed for cutting edge penetration). can be done.

The advancement device for the friction cutter piece 2 is the small cylinder cutting edge 3.
Unlike other construction methods, there is no need for a dedicated advancement device for the friction cutter piece 2, as the propulsion jack 6 provided at the rear end is also used to move it forward.

As another example, as shown in FIG. 6, when the box 1' is used as a large underground structure to be dug underground, a small cylindrical blade shaped like a gate is provided at the front of the box 1'. It is sufficient to arrange the holding cylinder 5 as a holding frame for holding the 3 groups of mouths and the 3 groups of small cylindrical blade mouths. It is effective when the soil type is

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 planar shape instead of in a portal shape. Yo℃・.

In this example, even if the cross-sectional shape of the box is different, by changing the width or height of several small cylinder cutting holes and the holding cylinder, the small cylinder cutting opening can be adjusted to match the width and height of the box. Since it is possible to arrange the group of small cylinders and the group of holding cylinders, and also to be able to adjust the thickness of the floor plate and wall of the case, most of the small cylinder blade group and the holding cylinder group can be reused, and the structure is simple. Assembling, disassembling,
It is also more economical because it is easy to transport.

As described above, the method for constructing an underground structure of the present invention allows protection work for an underground structure to be excavated into the ground to be carried out simultaneously with the excavation of the underground structure, without having to be constructed in advance as in conventional construction methods.
This is an innovative construction method that can safely, reliably, quickly, and inexpensively construct large underground structures.In particular, when constructing slabs using this method, the construction of slab girder 1 is as shown in Figure 8. Later, the abutments 7, piers, etc. of the platform girder can be constructed safely and quickly in the lower ground protected by the platform girder, and the platform girder can also be constructed after constructing the abutments, piers, etc. in advance.
Furthermore, when constructing under an embankment, a platform girder is created above the abutment, pier, etc., and by alternately repeating excavation of the abutment, pier, etc. and excavation of the platform girder, it is possible to construct a significantly wider underground passage. A wide range of things are beneficial.

Although the method of the present invention has been explained above by giving examples, it goes without saying that the present invention is not limited to these examples, and various modifications may be made without departing from the spirit of the present invention. The design can be modified.

[Brief explanation of drawings]

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. DESCRIPTION OF SYMBOLS 1... Plate-shaped girder, 1'... Box, 2... Friction cutter piece, 3... Small cylinder cutting edge, 4... Holding frame, 5... Holding tube, 6 ... Propulsion jack, 7... Abbut.

Claims (1)

[Claims] 1 The front part of the underground structure to be excavated into the ground and advanced is composed of a small cylindrical blade group having a tip opening surface and a holding frame that holds the small cylindrical blade group, Each of the blade mouth groups is slidably inserted into the holding frame in a state of protruding forward from the front end of the holding frame, and each of the tips of the elongated, friction cutter pieces arranged at the top of the underground structure is is rigidly connected to the front part of the group of small cylindrical blade openings, and after the small cylindrical blade openings have been excavated and advanced one by one using the conventional construction method, the underground structure is excavated and advanced using the conventional construction method. An underground structure construction method characterized by repeated construction.