JPH11223100A - Cutting face curing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform the curing easily and definitely for preventing the rupture of cutting face. SOLUTION: A suck body 10 capable of supporting the whole of a cutting face 4 by expanding the sack is located at an opposite side of the cutting face in a shrunk state, a supporting plate 6 for receiving the reaction of expansion at the time when the sack body is expanded is installed at the rear of the sack body in a state of closing the tip portion of a tunnel, and the cutting face is supported by the sack body to prevent the rupture of the cutting face by pressuring and injecting a fluid to the sack body and expanding the sack body. Water is used as a fluid for expanding the sack body. A filler consisting of a foaming material is filled to the position at the opposite of the cutting face, the filler is pressured by expanding the sack body, and the cutting face is supported to prevent the rupture. As a filler, a foamed styrene plate or foamed styrene particles put in storing sacks are used. Air is used as a fluid for expanding the sack body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a face curing method applied to the construction of a tunnel for preventing face collapse.

[0002]

2. Description of the Related Art As a construction method suitable for constructing a tunnel crossing just below an existing railway or road, the construction method shown in FIGS. This is so that a large number of small tunnels 2 are provided in a continuous state at the contour position of the tunnel 1 to be constructed in advance, and then the tunnel 1 is constructed by excavating the inside surrounded by the large number of small tunnels 2. It was done. According to such a construction method, the outer contour is pre-constructed by the continuation of the small tunnel 2,
The ground can be prevented from loosening when excavating inside,
It is possible to effectively prevent vehicle traffic on the ground and adverse effects on existing structures. In this case, the construction of each small tunnel 2 uses a square steel pipe 3 having a small cross section (for example, about 1000 mm × 800 mm) as shown in FIGS. It is generally carried out by a propulsion method of removing soil from sand and propelling it.

[0003] When a tunnel is to be constructed immediately below an existing railway, the operation must be performed while avoiding the operation of a railway vehicle. Therefore, the operation of constructing the small tunnel 2 by the above-mentioned propulsion method is required. In general, trains are also limited to late-night to early-morning hours, which are non-operational hours of railway vehicles. When the construction of the small tunnel 2 is performed intermittently under such conditions, it is indispensable to carry out curing for preventing the face 4 from collapsing at the end of the work. If no curing is performed on the face 4, there is a concern that the face 4 may collapse due to the passage of a railway vehicle during the daytime, which may cause the ground to loosen.

For this reason, conventionally, as shown in FIGS. 8 and 9, at the end of work, sandbags 5 are stacked on the face 4 and a support plate 6 for supporting the stacked sandbags 5 is provided at the tip end of the steel pipe 3. The sandbag 5 and the support plate 6 prevent the face 4 from collapsing.
As the support plate 6, a steel plate having a thickness of about 9 mm is used. In order to firmly insert the steel plate into the steel pipe 3, angle members 7 are fixed to both side walls in the steel pipe 3 by welding or the like. A support member 6 is supported from the back side by bridging a horizontal member 8 made of a square pipe member. Further, a camber (wedge) 9 is driven between the horizontal member 8 and the support plate 6 so that the support plate 6 is pressed against the sandbag 5 without looseness.

[0005]

However, in the conventional face curing method using the sandbags 5 as described above, at the end of the work and at the start of the work, the operation of stacking a large number of heavy sandbags 5 and the work of removing the sandbags 5 are performed. It is necessary, and the work must be performed in an unnatural posture in the steel pipe 3 having a small cross section, so that the work is extremely labor intensive and inefficient. Furthermore, since it is not always easy to completely pile up the sandbags 5 without any gaps, there is a concern that even minor collapse of the face 4 cannot be completely prevented, and thus it has been considered that an effective remedy is required.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an effective method for easily and surely performing face curing.

[0007]

According to a first aspect of the present invention, a bag body capable of supporting the entire face by being inflated is arranged at a position facing the face in a contracted state, and the bag body is inflated. At the time, a support plate for receiving the expansion reaction force is installed at the rear position of the bag body so as to close the tip of the tunnel, and a fluid is pressurized and injected into the bag body to bring the bag body into contact with the support plate. The bag is supported by the bag body to prevent the collapse of the face.

A second aspect of the present invention is characterized in that, in the first aspect of the present invention, water is used as the fluid.

According to a third aspect of the present invention, a filling material made of a foam material is filled at a position facing the face, and the bag body for pressing the filling material is expanded and arranged at a rear position thereof in a contracted state. And, when the bag body is inflated, a support plate for receiving the inflation reaction force is installed at the rear position of the bag body so as to close the tip of the tunnel, and a fluid is injected under pressure into the bag body. By inflating the bag body between the support plate and the filler, the bag supports the face through the filler to prevent collapse.

A fourth aspect of the present invention is characterized in that, in the third aspect of the invention, a polystyrene foam plate densely laminated between the face and the bag is used as the filler.

A fifth aspect of the present invention is characterized in that, in the third aspect of the invention, a material in which a large amount of styrofoam particles are stored in a storage bag is used as the filler.

The invention of claim 6 is the invention of claim 3, 4, or 5.
The present invention is characterized in that air is used as the fluid.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a case where a small tunnel 2 is constructed by advancing a steel pipe 3 in the above-described tunnel construction method will be described with reference to the drawings. Note that the same components as those of the conventional one are denoted by the same reference numerals.

First, a first embodiment will be described with reference to FIGS. This is achieved by using a bag body 10 that can be inflated and contracted, disposing the bag body 10 facing the face 4 and inflating it by injecting water into the inside of the bag body 10 and inflating the bag body 10 with an inflation reaction force. Is received by the support plate 6 to support the cutting face 4 by the bag body 10 and prevent its collapse.

The bag 10 is made of a material such as a nylon material, a vinyl chloride material, a rubber material, a rubberized material, etc.
It is formed by suturing or bonding a thin film material, cloth material, and sheet material with sufficient strength. It expands when water is injected under pressure and shrinks when water is discharged. Can be done. The bag body 10 in this example is formed in a rectangular box shape in an inflated state as shown in FIG. 3, but its shape and dimensions are determined by the sectional shape of the small tunnel 2 to be constructed and the installation of the support plate 6. In consideration of the position, etc., the face 4 and the tip of the steel pipe 3 and the support plate 6
What is necessary is just to set it as what can expand larger than the space formed and enclosed by.

The back of the bag 10 (the surface on the support plate 6 side)
Are provided with two connection pipes 13 for connecting a water supply pipe 11 and a drain pipe 12. As shown in FIG. 4, the connection pipes 13 are attached by sandwiching the bag body 10 from inside and outside by a short pipe 13a with a flange and a fastening flange 13b. The diameter of these connection pipes 13 may be, for example, about 15 to 25φ.
The hose 1 or the drain pipe 12 is detachably connected by being tightened by the band 14.

On the upper back side of the bag body 10, a thickness of 2 m used for holding the bag body 10 with the support plate 6 is provided.
A rubber plate 15 of about m is attached so as to extend rearward. Note that a similar rubber plate may be appropriately attached to each surface, particularly the bottom surface, for the purpose of reinforcing the bag body 10.

To carry out face curing using the above-mentioned bag body 10 at the time of completion of tunnel construction, the bag body 10 is placed in a contracted state at a position facing the face 4, and the bag body 10 is placed behind it in a conventional manner. And the support plate 6 is erected. That is, as shown in FIG. 2, a supporting plate 6 made of two steel plates is erected in the same manner as in the prior art, and both ends are supported by an angle member 7 so that a horizontal member 8 bridged in the steel pipe 3. , And are installed in a state where the front end of the small tunnel 2 is closed by the support plates 6.

When the support plate 6 is erected, the bag 1
By sandwiching a rubber plate 15 attached to the upper rear surface of the support plate 6 between the upper portion of the support plate 6 and the upper surface of the steel pipe 3, the bag body 10 in a contracted state is held inside the support plate 6. I do.

An opening 6a for passing the water supply pipe 11 and the drain pipe 12 is provided in the support plate 6 by cutting out (or by drilling) the support plate 6. The water supply pipe 11 and the drain pipe 12 connected to the body 10 are passed through the openings 6a. Alternatively, when the support plate 6 is erected, the connection pipe 13 protruding to the back side of the bag body 10 is positioned in the opening 6a.
A water supply pipe 11 and a drain pipe 12 may be connected to 3. Then, as shown in FIG.
A water pressure gauge 17 is attached via 6b, and a drain pump 19 is connected to the drain pipe 12 via a valve 18.

Next, the water supply pipe 11 is connected to a water supply pipe or a pressurized water supply pump when higher pressure is required, and the valve 18 of the drain pipe 12 is closed, and the water supply pipe 11 is inserted into the bag body 10 through the water supply pipe 11. Water is injected under pressure to expand the bag 10. The water pressure gauge 17 is monitored, and when the desired internal pressure is reached, the water supply is stopped, the valve 16b is closed, and that state is maintained. As a result, the bag body 10 expands so as to cover the entire space surrounded by the face 4 and the steel pipe 3 and the support plate 6, and the expansion reaction force is received by the support plate 6.
0 supports the face 4 and prevents its collapse.
Note that the internal pressure of the bag body 10 may be optimally set in consideration of the condition of the ground and the like so as to effectively prevent face collapse.

In order to release the curing when resuming the construction of the tunnel, the water supply pipe 11 is released, the valve 18 of the drain pipe 12 is opened, and water is drained from the inside of the bag body 10 through the drain pipe 12 by the drain pump 19. The bag 10 may be contracted, the support plate 6 may be disassembled and removed, and the bag 10 may be taken out.

According to the above-mentioned method, the face 4 can be supported by the bag 10 only by injecting water into the bag 10 under pressure to expand the bag, and the fall prevention and curing can be performed. The workability can be remarkably improved as compared with the case of stacking. Further, since the bag body 10 freely expands according to the form of the space surrounded by the face 4, the steel pipe 3, and the support plate 6, the entire space is naturally completely closed by the bag body 10 without any gap. There is no room for minor collapse. For the same reason, the support plate 6 is naturally pressed by the lateral member 8 by the bag body 10, so that the camber 9 which was conventionally required to press the support plate 6 against the sandbag 5 may be omitted.

In the above method, the support plate 6 and the angle members 7 and the horizontal members 8 for installing the support plate can be diverted from conventional ones.
1, a drain pipe 12, a water pressure gauge 17, a drain pump 19 (the drain pump 19 can be omitted if natural drainage is possible), etc., can use general-purpose products and do not need any special one. Since the bag body 10 itself can be manufactured at low cost, the cost does not increase significantly as compared with the case where the conventional sandbag 5 is used.

If air remains in the bag 10 in a state where the bag 10 is contracted, water cannot be completely injected into the bag 10, which is not preferable.
In a state where 0 is contracted, it is preferable to bleed the air as much as possible (ideally, to keep a vacuum state). Alternatively, it is conceivable to provide an air vent for bleeding air from the inside of the bag 10 when injecting water at a position that is the topmost portion of the bag 10. In this case, an air vent may be provided in addition to the two connection pipes 13 for water supply and drainage, but an air vent is provided at the top of the bag body 10 and a connection serving as a water supply port and a drain port is provided at the bottom. It is also conceivable to provide a port and selectively connect the water supply pipe 11 and the drain pipe 12 to the connection port. In this case, when the bag body 10 is inflated, the water supply pipe 11 is connected to the connection port to inject water while releasing air from the air vent, and when the bag body 10 is contracted, the drain pipe 12 is connected to the connection port. Then, water can be released while air is introduced from the air vent.

As the pressurized fluid for inflating the bag body 10, it is most preferable to use water as described above because it is the simplest and cheapest. However, in some cases, other water such as air or pressurized oil is used. It does not preclude the use of pressurized fluids. Furthermore, the support plate 6 for receiving the inflation reaction force of the bag body 10 and its installation form are not limited to the above-described configuration as long as they can reliably receive the inflation reaction force. It is natural.

The first embodiment of the present invention has been described above. Next, a second embodiment will be described with reference to FIG. In the above-described first embodiment, the face 4 is directly supported by the inflated bag body 10. However, in the second embodiment, a position facing the face 4 is filled with the filler 20 and the filler 20 is filled. By disposing a bag 21 between the support plate 6 and the support plate 6 and inflating the bag 21 to press the filler 20 forward and receiving the expansion reaction force by the support plate 6, the filler 20 Face 4 indirectly through the bag body 21 via
In order to prevent collapse. In this case, it is assumed that the filler 20 is much lighter and easier to handle as compared with the conventional sandbag 5, and a styrofoam plate which is sufficiently lightweight and has excellent compressive strength is adopted and stacked without gaps. To use. In the first embodiment, water is used as a pressurized fluid for inflating the bag body 10. However, in the second embodiment, the bag body 21 is inflated by blowing air, and the bag body 21 is inflated. A so-called air jack that expands by pressurizing and injecting air through an air pipe 23 by a simple stepping foot pump 22 is employed.

In the second embodiment as well, an extremely lightweight foam material is used as the filler, in addition to the effect of preventing the collapse of the face by the bag 21 although indirectly via the filler 20. Therefore, workability can be remarkably improved as compared with the conventional case where sandbags 5 are stacked. In addition, by inflating the bag body 21 with air, that is, by using air as a pressurized fluid, it is possible to use a general-purpose air jack.
There is an advantage that the configuration and the operation procedure are simplified as compared with the embodiment. However, if necessary, the bag body 21 may be expanded using a high-pressure blower, or the bag body 21 may be expanded using water, pressure oil, or another pressurized fluid instead of air. .

FIG. 6 shows a third embodiment in which a large amount of small-diameter styrofoam particles 24 are stored in the storage bag 2 instead of the styrofoam plate of the second embodiment.
5 (in the form of a so-called bead cushion) is used as the filler 26.
In this case as well, the same effects as in the second embodiment can be obtained, and the work of disposing the filler 26 on the face 4 becomes easier, and the form of the filler 26 is the face 4, the steel pipe 3, and the bag 21 Naturally follows the form of the space surrounded by the gaps, and there is no room for gaps to occur.

The embodiment in which the present invention is applied to the construction of the small tunnel 2 by propelling the steel pipe 3 by the propulsion method has been described above. However, the invention is applied to the construction of such a small tunnel 2. Needless to say, when curing is necessary to prevent face collapse, it can be widely applied regardless of the scale or use.

[0031]

As described above, according to the first aspect of the present invention, since the bag is inflated and the inflation reaction force is received by the support plate, the face is supported by the bag and its collapse is prevented. In addition, workability can be remarkably improved as compared with a conventional case where sandbags are stacked. In particular, claim 2
If water is used as the pressurized fluid for inflating the bag as in the invention, no special and complicated device is required and the operation procedure is simple.

Further, according to a third aspect of the present invention, the face is filled with a filler made of a foam material, and the bag is inflated so that the filler is pressed and the expansion reaction force of the bag is received by the support plate. Therefore, not only can the face be indirectly supported by the bag through the filler and the collapse can be prevented, but also by using a foam material that is lightweight, easy to handle and has sufficient strength as the filler, Workability can be remarkably improved as compared with the case where a conventional sandbag is used. In particular, if a styrofoam plate is used as a filler as in the invention of claim 4, it is only necessary to laminate the styrofoam plates, and as in the invention of claim 5, a large amount of styrofoam particles are stored in the storage bag as the filler. With the use of the above, the work of filling the face is easier and there is no room for gaps. Further, if air is used as the pressurized fluid for expanding the bag body as in the invention of claim 6, it is easier and more convenient. It can be inexpensive and a general-purpose air jack can be used.

[Brief description of the drawings]

FIG. 1 is an overall view showing a state in which a face curing method according to a first embodiment of the present invention is performed.

FIG. 2 is a perspective view of a main part of the same.

FIG. 3 is a diagram showing a bag used in the method.

FIG. 4 is a sectional view of an essential part of the bag.

FIG. 5 is an overall view showing a state in which a face curing method according to a second embodiment of the present invention is performed.

FIG. 6 is an overall view showing a state in which a face curing method according to a third embodiment of the present invention is performed.

FIG. 7 is a diagram showing an example of a tunnel construction method.

FIG. 8 is an overall view showing a state in which a conventional face curing method is performed.

FIG. 9 is a front view of the same.

[Explanation of symbols]

 2 Small Tunnel (Tunnel) 4 Face 6 Support Plate 10 Bag 20 Filler (Styrofoam Plate) 21 Bag 24 Styrofoam Granules 25 Storage Bag 26 Filler

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kenji Asano 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Toru Kubo 1-2-3 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Toshio Waki 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Masahiro Kurosaka 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation

Claims (6)

[Claims] Claims: 1. A face curing method for preventing face falling in tunnel construction, comprising: a bag body capable of supporting the entire face by being expanded; When the bag is inflated, a support plate for receiving the inflation reaction force is installed at the rear position of the bag so as to close the tip of the tunnel, and a fluid is injected under pressure into the bag to pressurize the bag. A face curing method characterized by expanding the space between the support plate and the face, thereby supporting the face by the bag and preventing the bag from collapsing. 2. The face curing method according to claim 1, wherein water is used as the fluid. 3. A face curing method for preventing face falling in tunnel construction, wherein a filling material made of a foam material is filled at a position facing the face and expanded to press the filling material. Is arranged in a rearward position thereof in a contracted state, and a support plate for receiving the expansion reaction force when the bag is inflated is installed at a rearward position of the bag so as to close the tip of the tunnel. By injecting fluid into the bag body under pressure to expand the bag body between the support plate and the filler, the bag supports the face through the filler to prevent collapse. A face curing method characterized in that it is prevented. 4. The face curing method according to claim 3, wherein a styrofoam plate densely laminated between the face and the bag is used as the filler. 5. The face curing method according to claim 3, wherein a large amount of styrofoam particles stored in a storage bag is used as the filler. 6. The face curing method according to claim 3, wherein air is used as the fluid.