JP2000154700A - Stretcher of expansion air duct for tunnel work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stretcher of an expansion air duct being available by application to a system, in which exhaustion is conducted to a surface by particularly installing a blower for exhaustion into a shield tunnel pit. SOLUTION: In a tunnel excavated and formed by a shield machine Sm or the like, a base pipe 4 for connection connected at the front end section of the air duct Wp, in which the front end side is joined with an in-tunnel blower and the rear end side is directed towards a surface, is installed to succeeding trucks Fd1, Fd made to succeed and disposed to the shield machine Sm or the like. An expansible grip body 5 is mounted on the latter-half side outer circumference of the base pipe 4, and the shrunk grip body 5 is covered with the expansion air duct Wp and the grip body 5 is expanded and the expansion air duct Wp is held so as o be elongated gradually as being synchronized with the proceeding of the shield machine Sm when the expansion air duct Wp joined with the base pipe 5 while the expanded grip body 5 is shrunk when the expansion air duct Wp is removed from the base pipe 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stretching device for a stretchable wind pipe which is useful in tunnel construction, particularly in tunnel construction by a shield method.

[0002]

2. Description of the Related Art In tunnel tunnels during excavation, it is necessary to constantly supply fresh air or discharge heated air, harmful gas, dust and the like in the tunnels for underground workers. Therefore, in the prior art, a method of installing a blower outside the mine and piping or blowing air to the inside of the mine to send or exhaust air, or a method of installing a blower inside the mine and piping the same air tube and exhausting to the outside of the mine Or a method of using these together.

However, in a tunnel being excavated by a shield machine, the face, which is the center point of the work, naturally moves forward with the excavation. Must be extended, but the extension depends on the piping material (wind pipe) used.
Can be stretched only in units of length. In other words, if the pipe line is made of 10 m pipe material, the suction line located at the head of the pipe line connected to the underground blower is used.
When the face is moved forward, the effective installation position of the exhaust port is at most 10 m away from the predetermined position, and there is a problem that the efficiency of intake and exhaust is significantly deteriorated. In particular, if a blower is installed in the mine during shield tunnel construction, the blower is attached to the trailing bogie. There is a problem that the stretching and the extension must be performed.

As a solution to this problem, it is necessary to interpose an expansion / contraction wind pipe at a suction / exhaust port of a pipe connected to an underground blower or at a connection portion between a downhole blower and a wind pipe forming a piping line. There is. At present, as a telescopic wind tube, a double tube system using a metal tube and a bellows tube system made of cloth or plastic are adopted, but both have problems. That is,
Since the double pipe method is a straight pipe made of metal, it cannot follow the curve of the tunnel, and the air leaks from the gap formed to slide the double pipe, or double the stretching distance. There is a problem that the installation distance is required. On the other hand, there is a problem that the bellows tube cannot be functioned because it is stretched more than necessary due to the strong wind caused by the blower, and is bent or fluttered by wind pressure. In addition, the extension device of the suction / exhaust port in the underground blower system is usually mounted on a succeeding bogie that advances in parallel with excavation in the case of a shield tunnel, and a special bogie (truck, etc.) in the case of a mountain tunnel. Is set.

[0005]

DISCLOSURE OF THE INVENTION In view of the above-mentioned prior art, the present invention is particularly applicable to a system in which an exhaust blower is installed in a shield tunnel mine to exhaust air outside the mine. It is an object of the present invention to provide a tube stretching device.

[0006]

Means for Solving the Problems An object of the present invention, which has been made to solve the above-mentioned problems, is to provide a structure provided in a tunnel which is excavated and formed by a shield machine or the like so as to follow the shield machine or the like. The bogie has a connection base tube connected to the underground blower at the front end and connected to the front end of the wind tube whose rear end is directed to the outside of the mine. When a telescopic air tube is joined to the base tube, the telescopic air tube is covered with a shrinkable grip body, and the telescopic air tube is expanded by expanding the grip body. It is characterized in that the grip is expanded so as to be gradually extended in synchronization with the progression, while the expanded grip body is contracted when the telescopic air tube is removed from the base tube. According to the present invention, in the above configuration, the connection base pipe and the downhole blower may be connected via a connection duct or may be directly connected without a connection duct. In addition, it is preferable that the wind pipe is supported by an aerial cable such as a wire stretched into the pit along the wind pipe in order to prevent the wind pipe arranged in the pit from swaying.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the stretching apparatus of the present invention will be described with reference to the drawings. FIG. 1 is a side view showing an example of a use form of the stretching apparatus of the present invention, FIG. 2 is a front view of the apparatus of FIG.
FIG. 3 is a schematic front view showing the relationship between the size of the connecting base tube, the grip body, and the expansion / contraction wind tube, and FIGS. 4 to 6 are side views showing the change of the use state of the stretching apparatus of the present invention in time series. FIG.

In FIG. 1 and FIG. 2, reference numeral 1 denotes a mounting base of the apparatus of the present invention fixed on a succeeding bogie Fd. Are supported. The distal end side of the connection base pipe 4 is connected via a connection duct Jd to the exhaust side of an exhaust blower Bw arranged behind the shield machine Sm and on the preceding succeeding bogie Fd1,
The trailing side is connected to the tip of an exhaust wind tube Wp that leads to the outside of the mine. The exhaust blower Bw and the connection base pipe 4 may be directly connected without passing through the connection duct Jd. In the figure, Si is a shield tunnel.

The foremost exhaust air tube Wp currently connected to the rear end of the connection base tube 4 is a telescopic air tube, and when the shield machine Sm moves forward according to excavation,
With the advance, the still folded part PP of the wind tube Wp is extended, and the next newly expanded telescopic wind tube Wp, which is completely folded, is now connected to the connecting base tube 4 and Wind pipe
Must be inserted and connected between Wp. As described above, the connection base pipe 4 has a function that must maintain the part PP of the leading wind pipe Wp that is currently connected, which is still folded, against the wind pressure of the blower Bw. When the leading wind tube Wp connected is extended, the wind tube Wp can be removed and the next new fully folded wind tube Wp can be removed.
Must be provided with a function that can be inserted.

Accordingly, in the present invention, the connecting base pipe 4 is
The configuration described below has been added. That is, 5 is the base tube 4
A wind tube grip body formed by an annular expandable and contractable annular body provided integrally with the base tube 4 on the rear half side on the outer periphery of
Reference numeral 6 denotes an air pipe for expanding and contracting the grip body 5 by supplying and discharging air into the grip body 5.
a, a valve 6b is provided, and the grip body 5 and the pipe 6 are used to expand and contract the grip body 5 so that the telescopic air tube Wp can be attached or detached, or a function of holding the fitting can be provided. .

The function of the wind tube stretching apparatus of the present invention will be described with reference to FIGS. When the expansion / contraction wind pipe Wp having the folded part PP is still connected to the connection base pipe 4 (see FIG. 4), as the excavation proceeds by the shield machine Sm, the folded part PP becomes a shield. It is necessary to extend in synchronization with the advance of the machine Sm, that is, to hold the machine Sm on the base tube 4 so as not to be extended at a stretch. For this reason, the grip body 5 is maintained in an inflated state in which air is supplied, so that the folded portion PP can only be gradually expanded by contact with the inflated portion. When the shield machine Sm advances to the position shown in FIG. 5 in this manner, since the above-mentioned unstretched portion PP has all been stretched, the first telescopic wind tube Wp currently connected to the base tube 4 and the base The connection to the tube 4 must be broken and a new fully folded wind tube Wp must be inserted and connected.

Therefore, in the apparatus of the present invention, in the state shown in FIG. 4, the grip body 5 is inflated by injecting air from the air pipe 6 so that the air is sealed inside, so that the unextended portion is formed. The expanded grip body 5 is made to have a resistance action such that the wind pipe PP is gradually expanded without being expanded at once by the wind pressure of the blower Bw. Here, the grip body 5 receives the pressure at which the wind blown out by the blower Bw flows backward in the wind pipe Wp on the rear side, and the apparent expansion outer diameter increases, and the unstretched portion PP of the wind pipe Wp is caused by wind force. Effectively restraining extra withdrawals. Further, in order to easily remove the extended wind tube Wp from the base tube 4 and attach and connect the newly folded new wind tube Wp to the base tube 4,
After bleeding the air from the grip body 5, a new wind tube Wp, which is normally set in a folded state on the outer surface of a sheath tube (not shown), is inserted into the base tube 4 together with the sheath tube. The sheath tube was pulled out from the wind tube Wp, and was detachable from the base tube 4.

In order to enable the above operation, in the apparatus of the present invention, as shown in FIG. 3, the outer diameter b of the grip body 5 when the grip body 5 is inflated is set to the outer diameter a of the connecting base pipe 4. Each diameter is preset so that it is larger than the diameter a and smaller than the inner diameter d of the sheath tube, and the outer diameter c of the grip body 5 when expanded is larger than the inner diameter d. Thereby, the above function is exhibited.

As described above, when a new telescopic air tube nWp which is completely folded as shown in FIG. 5 is set on the base tube 4, the front end Pf of the wind tube nWp is connected to the connection base tube 4. At the same time, the rear end Pr of the air tube nWp is connected to the front end of the elongated air tube Wp removed from the base tube 4 by a fastener Fj or the like, and the grip body 5 is filled with air and expanded. This completes the installation of the new wind tube nWp.

[0015]

The present invention is as described above. In order to connect a new telescopic wind tube to a telescopic wind tube connected to an underground blower, the shield machine is used in a tunnel excavated and formed by a shield machine or the like. A trailing bogie provided following the machine or the like is provided with a connecting base pipe having a front end connected to an underground blower and a rear end connected to a head of a wind pipe directed to the outside of the mine, and On the rear half outer periphery of the base pipe, an expandable / contractible grip body is provided, and when the telescopic wind pipe is joined to the base pipe, the contracted grip body is covered with the telescopic wind pipe, and then the grip body is removed. While expanding and holding the telescopic air tube so as to gradually extend in synchronization with the progress of the shield machine, when removing the telescopic wind tube from the base tube, the expanded grip body is contracted. So that Double-pipe system and the bellows tube wind tube stretched seen problems in the mechanism of the system, in particular, stretch-style tube or bent at once extended by wind pressure, it flutter is the extra extension, no.

[Brief description of the drawings]

FIG. 1 is a side view showing an example of a usage form of the device of the present invention.

FIG. 2 is a front view of the apparatus of FIG.

FIG. 3 is a schematic front view showing a relationship between diameters of a connection base pipe, a grip body, and a telescopic wind pipe.

FIG. 4 is a side view showing a use state of the stretching apparatus of the present invention.

FIG. 5 is a side view showing a state in which the leading telescopic wind tube in FIG. 1 is fully extended in the stretching apparatus of the present invention.

FIG. 6 is a side view showing a state in which a new telescopic wind tube is mounted in the wind expansion device of the present invention.

[Explanation of symbols]

 Sm Shield machine Fd1, Fd Subsequent bogie 1 Mounting base 2, 3 Blood 4 Connection base pipe 5 Air tube grip 6 Air piping Bw Exhaust blower Jd Connection duct Wp Air tube nWp New air tube

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Kenji Abe 2-10-5 Katamachi, Miyakojima-ku, Osaka-shi, Osaka Inside Kumagaya Gumi Osaka Branch (72) Inventor Yoshiyoshi Marui Miyakojima, Osaka-shi 2-10-5 Katamachi-ku, Kumagaya-gumi Osaka Branch (72) Inventor Toshio Shimoda 1-1108 Yamaguchicho Hanshin Distribution Center, Nishinomiya-city Izuminai (72) Inventor Yasutaka Yumiba Yamaguchi, Nishinomiya-shi 1-108, Machihanshin Distribution Center Izumi Co., Ltd.

Claims (3)

[Claims] 1. A front bogie is connected to an underground blower, and a rear end is directed to the outside of a mine. When a connecting base tube connected to the front end of the wind tube is provided, and an expandable / contractible grip body is provided on the outer periphery on the rear half side of the base tube, and when the telescopic wind tube is joined to the base tube, After covering the telescopic air tube with the contracted grip body, the grip body is expanded and the telescopic air tube is held so as to gradually extend in synchronization with the progress of the shield machine. A stretching device for a telescopic wind pipe for tunnel construction, wherein the expanded grip body is contracted when the grip body is removed from the base pipe. 2. The extension device for a telescopic wind tube for tunnel construction according to claim 1, wherein the connection base pipe and the downhole blower are connected via a connection duct or directly connected without a connection duct. 3. The stretching apparatus for a telescopic wind pipe for tunnel construction according to claim 1, wherein the wind pipe in the pit is supported by an aerial rope stretched in the pit along the wind pipe to prevent the wind pipe from swaying. .