JPS5836719B2 - Pressurized excavation method for small diameter tunnels and its locking device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention mainly relates to a method for excavating a tunnel with a small diameter under pressure, and a locking device therefor.

Generally, when a tunnel is opened in soft soil or ground with water leakage using the shield method, etc., it is often necessary to install a lock chamber inside the tunnel and perform pressurized excavation using pressurized air. When excavating tunnels with small diameters, the lock chamber and pressure air piping make the tunnel interior even more narrow and become an obstacle to grinding and other operations.In addition, conventional lock chambers are inserted and propelled as the tunnel is excavated. Because it was installed using the inner wall of Hume pipes, it was impossible to set up a lock chamber until at least several Hume pipes had been propelled, and during that time, unpressurized excavation was required. There was a problem with being forced to write.

The present invention technically overcomes the problems described above, enables pressurized excavation, which is necessary from the very beginning of excavation, and improves the safety and efficiency of construction work.

The construction method and apparatus of the present invention will be described in detail below according to the embodiments shown in the drawings.Firstly, a lock chamber as shown in FIG. 1 is manufactured as a unit.

That is, part 1 is mainly a cylindrical lock chamber made of an iron plate, etc., and has an outer diameter that allows it to be inserted freely into the target fume pipe, and a collar 2 is integrally attached to the outer peripheral surface along the rear edge. The rubber packing 2' is circularly attached to the front surface of the collar 2.

Further, 3 is a lock door at the tip of the main body, 4 is a lock door in the middle thereof which can be opened and closed toward the front, and 5 is a pneumatic air pipe that penetrates the inside of the main body and opens to the front.

In addition, it is preferable that the length from the tip of the main body to the flange is about 1 m.

Next, we will discuss the pressurized excavation method of the present invention, which is carried out using the lock chamber R with the above configuration.
It is still the same as the conventional shield construction method for this type of tunnel, but the above-mentioned method is similar to the conventional shield construction method for this type of tunnel. A pressing jack 9 of the lock chamber R is installed on both sides of the jack, and a compressor 10 is installed on both sides of the jack.
A pipe or a hose 11 is provided to pass through the lock chamber.

Note that 12 in the figure indicates the cutting edge at the tip of the Hume tube.

As shown in FIG. 2A, a daily cut hole 13 is provided in the area where the shaft is planned to be opened using the vertical shaft 6, and this opening hole 13 is
After inserting the blade opening 12 into the blade, the first fume pipe 7 is suspended and connected to the blade opening 12. At the same time, the lock chamber R is inserted from the rear end, and the lock chamber R is opened using the pressing jack 9. The Hume tube is pushed toward the blade mouth 12 side through this.

In this state, air is supplied from the compressor 10 to pressurize the face surface while excavating. At this time, the grinding material is transported outside the mine via the lock chamber R at any time, and as the excavation progresses, spacers are removed. Propelling the fume pipe 7 appropriately by the main push jack 8 with or without the -8' is the same as in the conventional pneumatic construction method.

(See Figure B) If the Hume Pipe 7 is completely advanced through such excavation work, temporary earth retention etc. can be applied to the face as necessary to prevent collapse after the pressure decreases. The air supply by the compressor 10 is stopped, the main push jack 8 is further shortened, the lock chamber R is removed from the first fume pipe 7, and the second fume pipe 7' connected to the preceding fume pipe is removed. Insert the lock chamber R into the rear end and press the lock chamber R again using the pressing jack 9 (see C in the same figure).
After that, air is supplied and pressurized inside, and the excavation of the face and the propelling of the Hume pipe are repeated in the same manner as described above, and the third, fourth, etc.
It connects and propels the Hume tubes of ... over the entire length of the tunnel.

As is clear from the above, according to the construction method of the present invention, safe work using pressurized air is possible from the beginning of tunnel excavation. There are no obstacles such as lock chambers or air pressure pipes, and the narrow internal space can be used effectively, significantly improving the work efficiency of drilling, surveying, etc., and particularly improving the economy and safety of excavation work in small-diameter tunnels. It has an extremely powerful effect on improving sexuality.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of the center of the locking device of the present invention, and Fig. 2 is a cross-sectional view schematically showing the steps of the construction method of the present invention. Fig. B shows the condition at the start of excavation; Fig. B shows the state in which the Hume pipe is being propelled by the main push jack as excavation progresses; Fig. C shows the state when digging is restarted with the second Hume pipe connected. Further, FIG. 6D shows the state at the time when the second Hume tube has been propelled. In addition, in the figure 1... mainly the lock chamber, 2...
Tsuba, 3, 4...・・・． Lock door, 5...
Air pressure pipe, 6... Vertical shaft, 7,7'... Hume pipe, 8... Main push jack, 9...
・Press jack, 10...Compressor, 1
1...Piping or hose, 12...Blade mouth.

Claims (1)

[Scope of Claims] 1. When excavating a tunnel while propelling a Hume pipe, etc. using a main push jack, an opening hole is opened on the shaft surface in pressurized excavation work in which the face surface is pressurized with pressurized air. The main method is to insert a cutting edge into this, insert and press a lock chamber unit into the rear end of the fume pipe that is successively connected to the cutting edge, and to make it possible to freely feed pressurized air to the face side. Pressurized drilling method for small diameter tunnels. 2. The main body is dripped from a cylindrical iron plate or the like having an outer diameter that can be inserted into the target fume pipe, and the rear edge is integrally protruded with a flange with a packing material ringed on the front side, A locking device mainly used for pressurized excavation in small-diameter tunnels, characterized in that a lock door is provided at the front end and middle part of the main body, and a pressure air pipe is provided that penetrates the main body and opens at the front surface thereof.