JPS5947798B2 - How to build underground structures - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for constructing underground structures such as tunnels.

In the conventional tunneling method, when excavating underground from the tunnel entrance, the ground becomes loose due to the collapse of the tunnel entrance, etc., making it difficult to overturn the existing structure.As a result, the underground structure at the tunnel entrance becomes larger than the required cross section, making it uneconomical.

The present invention provides a method for constructing an underground structure that eliminates the above-mentioned drawbacks, and includes a towing and propulsion method for a completed excavation structure including a pre-constructed mine entrance structure and a cutting edge to be excavated in front of the structure. Excavating into the ground using conventional construction methods such as towing and propulsion methods, leaving the entrance and the entrance structure in the ground in front of the entrance, and excavating the structure in front of it further into the ground. This is a construction method in which the space created underground behind the excavation structure is constructed by constructing primary and secondary linings of the required cross section using segments, shoring, cast-in-place concrete, etc., and the completed mine entrance structure with guaranteed strength is placed in the ground. By advancing it inside and leaving it separated at the pit entrance, it is economical as there is no need for a large pit structure unlike conventional ones, and since the structure does not require over-excavation, there is no loosening of the ground at the pit entrance. It can be constructed safely and quickly, and by arranging multiple excavation structures in sequence, the excavation position of the face and the position where the underground structure is constructed by lining the underground space created behind the tail end of the excavation structure can be moved far away. By separating them, each work can be carried out independently, which speeds up the construction period, and there is no need to worry about collapse of the face, making it possible to construct a safe and reliable structure. It can be said to be an excellent method for constructing underground structures because the remaining parts are placed and used as part of the underground structure.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The method for constructing an underground structure according to the present invention will be described below with reference to drawings, using one embodiment.

As shown in Fig. 1, four completed digging cylinders 11,1°13.
And behind it, completed remaining cylinders 21, 2□ are constructed to be left separately at the wellhead B section, and each cylinder 1□.

12. The areas between 13, 14, 2□, and 22 are protected by a protective tube 9.

In addition, each cylinder is equipped with a propulsion jack equipment 4 and a traction jack equipment 5.
, a separating member 6, a fixing device 7, etc., are provided.

Next, as shown in FIG.
When □, 22 reached the tunnel entrance B, the remaining cylinders 21, 2° were separated and left underground at the tunnel entrance B to form an underground structure, and then the excavation cylinders 11, 1° + 131 14 were While advancing underground, the lining structure 3 is constructed by primary lining, secondary lining, etc. such as H steel hanging sheet piles, segment assembly, and cast-in-place concrete placement in the underground space created behind the rearmost cylinder 14. This is to construct an underground structure.

Furthermore, as shown in FIG. 3, the remaining cylinder 1□ from item 1.

12. For items 13 and 14, after the excavation is completed, the advancing equipment, cutting edge, etc. will be removed and left in the ground as part of the underground structure. There is no need to remove the remaining cylindrical body, and therefore there is no need to build a lining structure correspondingly, saving materials and labor, further shortening the construction period, and making it more economical.

As is clear from the above explanation, in the method of the present invention, the completed cylinder is excavated, so there is no over-drilling, the ground at the tunnel entrance does not loosen, and the completed cylinder is left at the tunnel entrance. Since the highly strong completed structure replaces the easily collapsible soil at the tunnel entrance, there is no need to construct an underground structure by pouring in place at the tunnel entrance, and the excavation position of the face of the forward cylinder and the underground structure behind the forward cylinder are eliminated. By separating the lining positions in the space, excavation work and lining work can be done independently, shortening the construction period.Since the completed cylinder is excavated, the face part will not collapse vertically or horizontally, making it safe.
This method of constructing underground structures is economical and has a short construction period because the work can be concentrated only on excavating the front face and retaining the earth.

The method for constructing an underground structure according to the present invention has been explained above using embodiments and drawings, but the present invention is of course not limited to these embodiments, and may be modified without departing from the spirit of the invention. Various design modifications can be made.

[Brief explanation of the drawing]

1, 2 and 3 are side views showing one embodiment of the method sequence of the present invention. A: Starting base, B: Mine mouth, 1.
10,12゜13.14・・・・・・Excavation cylinder, 2,2
1, 22... Remaining cylinder body, 3... Lining structure, 4... Propulsion jack equipment, 5...
・Towing jack equipment, 6... Towing parts, 7
...Fixing tool, 8...Blade mouth, 9...
・Protection tube.

Claims (1)

[Claims] 1. In a plurality of completed cylinders arranged one after another on the starting base, a propulsion jacking equipment is installed between each of the four cylinders, starting from the first cylinder having the cutting edge at the forefront, and before and after each cylinder, A traction member is inserted between the second cylinder and the rearmost cylinders, and a traction jack equipment is attached to the tip of the traction member, and a traction jack is attached to the rear of each cylinder below the cylinder without propulsion jack equipment. In a method of advancing a cylinder group underground using a cylinder group advancement device each equipped with a fixing device, the first cylinder and subsequent cylinders are sequentially and repeatedly moved using the cylinder group advancement device. It is advanced into the ground, and when the rear part of the rearmost cylinder reaches the mine entrance, the traction member is cut off at the rear of the cylinder, leaving the plurality of cylinders at the rear at the mine entrance, and the first cylinder and the other four cylinders are removed. The groups of cylindrical bodies are further sequentially advanced using the advancing device, and the underground space created behind them is sequentially lined using conventional construction methods to construct the required structure, and the front part of the first cylindrical body is A method for constructing an underground structure, characterized in that when a side tunnel entrance is reached, the advancing device and the cutting head are removed, and a predetermined underground structure is constructed and formed together with the entire cylindrical body.