JPH08210090A - Method and device for lining excavated wall surface of tunnel - Google Patents

Abstract

PURPOSE: To efficiently and continuously form a set layer having the desired strength while preventing the set layer from adhering to a cylindrical form, in a method for forming the set layer made of a setting material on the excavated wall surface of a small-diameter tunnel using the cylindrical form. CONSTITUTION: A cylindrical form 5 that is smaller in diameter than a temporary pipe 1 laid inside a tunnel T is connected to the temporary pipe 1 in such a way that it can advance integral with the pipe 1. After a setting material 6 is injected into a cavity 9 between the cylindrical form 4 and the excavated wall surface 8 of the tunnel, the cylindrical form 5 is moved back and forth by means of a jack 7 so as to form a cylindrical set layer integrated with the tunnel excavated wall surface 8, while preventing the setting material 6 from adhering to the cylindrical form 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a lining made of a hardenable material on a tunnel excavation wall as a temporary pipe laid in a tunnel advances, and an apparatus for carrying out the method. .

[0002]

2. Description of the Related Art When lining a tunnel excavation wall surface excavated by a shield machine, in a large-diameter tunnel, a formwork is assembled in the tunnel every time a tunnel of a certain length is advanced, and then the formwork and the tunnel are assembled. Construction is performed by placing concrete between the excavated wall surface, but lining work cannot be performed in the case of a tunnel with a small diameter where workers cannot enter or leave.

Therefore, a small-diameter shield machine excavates a tunnel from the starting shaft to the reaching shaft, and in accordance with the excavation, a temporary pipe is followed by the shield machine and sequentially added and propelled, and a plurality of tunnels are provided between the compatible shafts. After burying the temporary pipe in series, connect a cylindrical formwork having a smaller diameter than the temporary pipe to the temporary pipe at the rearmost part, and pull out the temporary pipe from the reaching shaft side one by one, while the temporary pipe advances by an appropriate length. A method of lining a tunnel excavation wall surface is proposed in which a curable material such as mortar is injected into a gap between the cylindrical formwork and the tunnel excavation wall surface to form a hardened layer.

[0004]

However, in the tunnel lining method as described above, when forming the hardened layer, the withdrawal of the temporary pipe is stopped and the void portion between the tunnel excavation wall surface and the cylindrical form is formed. When the curable material is injected into the, it adheres to the outer peripheral surface of the cylindrical form as the curable material hardens, so that after hardening to a hardened layer of constant strength integrally fixed to the tunnel excavation wall surface, When attempting to advance the cylindrical formwork to the next lining construction position together with the pipe, the curable material is integrally attached to the outer peripheral surface of the cylindrical formwork, so the cylindrical formwork is installed together with the temporary pipe. You will not be able to move forward.

Further, when the temporary pipe is advanced by a traction force that breaks the adhered portion against the adhesive force of the curable material, the cured layer itself receives tension and cracks occur, and groundwater passes through the cracks into the tunnel. It will infiltrate. Therefore, if a release layer such as silicon is provided on the outer peripheral surface of the cylindrical mold, the adhesive force of the curable material can be reduced. Since the curable material is cured while the formwork is stopped, it is impossible to completely prevent the curable material from adhering to the cylindrical formwork. The adhesive force to the layer also increases, and a large resistance force is generated when advancing to the next lining position, which not only lowers work efficiency but also may cause cracks in the hardened layer during advancing as described above.

The present invention has been made in view of the above problems, and an object thereof is to prevent the hardening material from adhering to the cylindrical form while maintaining a uniform strength on the wall surface of the tunnel excavation having a small diameter. The present invention provides a method for lining a tunnel excavation wall surface that enables efficient lining and formation of a hardened layer having the above, and an apparatus for performing the method.

[0007]

In order to achieve the above object, a method of lining a tunnel excavation wall surface of the present invention is to integrally connect an inner cylinder to a rear end of a temporary pipe laid in a tunnel, A cylindrical formwork having an outer diameter smaller than that of the temporary pipe is slidably fitted on the outer peripheral surface of the inner cylinder, and a curable material is placed in a space between the cylindrical formwork and the tunnel excavation wall surface. After the injection, the curable material is cured while reciprocating the cylindrical form in the front-rear direction or in the circumferential direction to form a cylindrical hardened layer, and the hardened layer is continuously applied to the tunnel excavation wall surface as the temporary pipe advances. It is characterized by being constructed.

In the above method, in the invention described in claim 2, the temporary pipe is tunneled together with the cylindrical form every time the hardening of the curable material injected into the gap between the cylindrical form and the tunnel excavation wall is completed. The invention described in claim 3 is characterized by advancing a predetermined length in the direction, and is synchronized with the curing speed of the curable material injected into the gap between the cylindrical formwork and the tunnel excavation wall surface. It is characterized in that the temporary tube is advanced together with the cylindrical form at the above speed.

As a device for carrying out the above method, as described in claim 4, a front end of an inner cylinder having a certain length is integrally formed at a rear end of a temporary pipe laid in a tunnel. A cylindrical formwork having a diameter smaller than that of the temporary pipe is slidably fitted into the inner cylinder, and a curable material is injected into the space between the tunnel excavation wall surface and the cylindrical formwork. And a jack for sliding the cylindrical form in the front and rear or in the circumferential direction in the rear end of the temporary pipe.

[0010]

[Operation] Each time the temporary pipe is moved forward for a certain length, a curable material is injected into the gap between the tunnel excavation wall surface and the cylindrical form, and the tunnel excavation wall surface is successively covered with a hardened layer. At the lining position, when the curable material is injected and cured in the gap between the tunnel excavation wall surface and the cylindrical form at the lining position, the cylindrical form The frame is moved back and forth or reciprocally in the circumferential direction. In this way, when the cylindrical formwork is reciprocated, the contact portion between the curable material and the cylindrical formwork is always in an edge-cutting state, and even if the hardening of the curable material progresses, the outer peripheral surface of the cylindrical formwork The curable material is densely and uniformly filled in the voids due to its vibration effect.

Then, in this state, the hardening of the hardening material progresses to form a uniform cylindrical hardened layer having a constant thickness and integrally fixed to the wall surface of the tunnel excavation. When the hardened layer reaches a certain strength, the temporary pipe is formed. Is moved forward by a certain length to move the cylindrical formwork together with the temporary pipe to the next lining position, stopped at that position, and again in the space between the tunnel excavation wall surface and the cylindrical formwork as described above. The curable material is injected and filled, and the cylindrical form is reciprocated to form a cured layer continuous with the previously provided cured layer.

The advancing operation of the temporary pipe is performed by advancing a predetermined length distance in the length direction of the tunnel after the hardening of the hardenable material injected into the gap between the cylindrical formwork and the tunnel excavation wall surface is completed. The cylindrical formwork may be integrally moved to the next lining position, and the curable material injected into the gap between the cylindrical formwork and the tunnel excavation wall has hardened to a certain strength. It is also possible to gradually move forward together with the cylindrical form according to the speed at which the curing further progresses.

[0013]

Embodiments of the present invention will now be described with reference to the drawings.
1 to 5, a temporary pipe 1 connected in series is laid in a tunnel T formed by excavation from a starting shaft A to a reaching shaft B. The outer peripheral surface of the temporary pipe 1 is in sliding contact with the tunnel excavation wall surface 8 to prevent the ground from collapsing. The rear end of the temporary pipe 1 at the end of the temporary pipe row connected in series is shown in FIG.
As shown in FIG. 2, a short tube body 2 having the same outer diameter as the temporary tube 1 is integrally connected, and ribs 2a are fixed to several places on the inner peripheral surface of the short tube body 2 and the ribs 2a The front end of the inner cylinder 3 having a fixed length is integrally fixed to the end surface. The front and rear ends of the inner cylinder 3 are formed in thick circular slidable contact surfaces 3a and 3b toward the outer diameter, and the circular slidable contact surfaces 3a and 3b are provided with seals 4 on the front and rear ends of the cylindrical formwork 5. The inner peripheral surface of the part is slidably in close contact. The outer peripheral surface of the front end of the cylindrical form 5 is slidably brought into close contact with the inner peripheral surface of the ring-shaped end plate 2c integrally provided at the rear end of the short tubular body 2.

The cylindrical form 5 has an outer diameter smaller than the outer diameter of the temporary pipe 1 and is formed to have the same length as or a little longer than the inner cylinder 3, and its outer peripheral surface is made of ceramic and fluororesin. A mold release layer 5a made of a composite coating or the like is layered, and the mold release layer 5a improves the releasability between the cured layer 6a of the curable material 6 described later and the cylindrical mold 5. or,
On the outer surface side of the rear end of the rib 2a, the front end of the cylindrical formwork 5 is provided with a fixed length, and a cut-in portion 2b capable of entering and exiting is provided, and jacks 7 are attached to the inner surface of the short tubular body 2 at several places. Then, the rod rear end of the jack 7 is integrally connected to the front end face of the cylindrical form 5, and the rods of these jacks 7 are expanded and contracted to slide the cylindrical form 5 back and forth on the inner cylinder 3. It is configured to let. It should be noted that these jacks 7 are oriented in the circumferential direction and their rod ends are integrally connected to the front end surface of the cylindrical form 5, so that the cylindrical form 5 reciprocally slides on the inner cylinder 3 in the circumferential direction. It may be configured as follows.

Further, at a suitable position of the short tubular body 2, a curable material which communicates with a part of the short tubular body 2 from an inner peripheral surface to a void portion 9 between the tunnel excavation wall surface 8 and the cylindrical formwork 5. An injection member 10a having an injection hole 10 is integrally provided, and an injection pipe 11 and a cleaning water supply pipe 12 having a valve 21 are connected to and communicate with the injection hole 10 from the inside of the short cylinder 2. ing. Injection tube
A return pipe 13 having a valve 22 and a quick-connecting material supply pipe 14 are sequentially connected in a branched state via a valve 23 provided in the injection pipe 11 to the tip of the pipe 11.

The injection hole 10 is provided at a proper position in the front end portion of the cylindrical form 5, and the outer end opening of the flexible injection short pipe is connected to the injection hole 10 to form the flexible injection short pipe. Inner tube 3 with inner end opening
The structure may be such that the injection pipe 11 and the like are connected and communicated with the opening facing the inner peripheral surface. Also the injection tube
11, the washing water supply pipe 12, the return pipe 13, the quick connection material supply pipe 14, etc. are connected and communicated with the respective supply facilities C installed on the ground from the reaching shaft B side through the inside of the temporary pipe row as shown in FIG. However, it may be arranged on the side of the starting shaft A through the tunnel T.

Next, a hardened layer formed by hardening the hardenable material 6 on the tunnel excavation wall surface 8 by the apparatus configured as described above.
A method of applying a lining consisting of 6a will be described. First, a large number of temporary pipes 1 are laid in series while excavating a tunnel T between the starting shaft A and the reaching shaft B. The laying work of the temporary pipe 1 is as shown in FIG. While the tunnel T is being excavated by the shield machine S from the starting shaft A to the reaching shaft B, the temporary pipe 1 is sequentially added to the shielding device S in accordance with the excavation, and is propelled by the propulsion jack G installed in the starting shaft A to reach the shaft. The shield machine S that has reached the vertical shaft B is removed and buried in a large number of series between the vertical shafts A and B.

As described above, the short cylinder 2 is connected to the rear end of the temporary pipe 1 at the rearmost portion of the temporary pipe row, and the cylindrical form 5 is slidably fitted on the short cylinder 2. After connecting the inner cylinders 3, the lining work is started. First, the foremost temporary pipe 1 is pulled from the reaching shaft B side by an appropriate pulling means (not shown) such as a winch, and the cylindrical formwork 5 is fixed length (the length of the cylindrical formwork 5) together with the temporary pipe row. When moving forward, the cylindrical form 5 is formed with a diameter smaller than that of the tunnel excavation wall surface 8. Therefore, a space 9 having an annular cross section is provided between the cylindrical form frame 5 and the tunnel excavation wall surface 8. To be The temporary pipe 1 is placed in this void portion 9.
The curable material 6 is injected through the injection pipe 11 and the injection hole 10 in a state where the advance is stopped, and the void 9 is filled with the curable material 6. The curable material 6 may be injected into the void 9 at the same time as the provisional tube 1 is moved forward to form the void 9.

As the curable material 6, for example, a mortar in which cement and sand are kneaded, a material in which bentonite is added to this mortar, or a mixture of water glass and sand,
At the time of injection, any material may be used as long as it is a liquid material and is cured after a certain period of time to form a cured layer 6a having a predetermined strength. Immediately before injecting the curable material 6 into the cavity 9, a quick-setting material that accelerates the curing of the curable material 6 is supplied to the injection tube 11 through the supply tube 14, and the cavity is mixed in the curable material 6. Inject into 9.

After injecting the curable material 6 into the void portion 9, the rod of the jack 7 mounted in the short tubular body 2 connected to the rear end of the temporary pipe 1 is expanded and contracted to form the cylindrical form 5. When it is reciprocated in the front-rear direction, the curable material 6 fills the voids 9 with a uniform density as a whole due to the vibration, and the contact surface between the curable material 6 and the cylindrical mold 5 is cut off and cured. The conductive material 6 is prevented from adhering to the outer peripheral surface of the cylindrical form 5. The prevention of adhesion of the curable material 6 is more surely performed by the release layer 5a layered on the outer peripheral surface of the cylindrical mold 5, and as the curing of the curable material 6 proceeds, The inner peripheral surface of the curable material 6 that is in sliding contact is smoothed to be in a completely peeled state.

On the other hand, the curable material 6 is completely adhered to the tunnel excavation wall surface 8, and in this state, the curable material 6 is cured and the cylindrical excavation wall surface 8 is integrally fixed to the tunnel excavation wall surface 8. Layer 6a is gradually formed. After the hardened layer 6a has hardened to a certain strength such that the shape of the hardened layer 6a is not deformed in the inner diameter direction, the temporary tube 1 is pulled again by a certain length to fit the cylindrical form 5 thereon. The inner tube 3 is integrally advanced, and by the advancement, a void portion 9 which is the next lining portion is provided, and the curable material 6 is injected into the void portion 9 and cured while reciprocating the cylindrical formwork 5. Then, a hardened layer 6a continuous with the hardened layer 6a is formed. When forming the first hardened layer 6a from the side of the starting shaft A, the space between the opening end of the tunnel excavation wall surface 8 and the outer peripheral surface of the cylindrical form 5 is sealed with an appropriate sealing material (not shown). deep.

As described above, every time the cylindrical form 5 is moved forward together with the temporary pipe row by a certain length, the curable material 6 is injected into the space 9 between the tunnel excavation wall surface 8 and the cylindrical form 5. The hardening is performed under the operation of the back and forth movement of the cylindrical form 5,
The hardened layer 6a is formed to be hardened to a certain strength, but after the hardened layer 6a is completely hardened, the cylindrical form 5 may be moved forward for a certain length. After reaching the temperature, the cylindrical form 5 may be gradually excavated by a certain length by pulling the temporary pipe 1 in synchronization with the curing speed until it is completely cured.

The hardenable material 6 is the tunnel excavation wall surface 8.
Every time it is filled and filled in the space 9 between the cylindrical formwork 5 and
While immediately closing the valve 23 of the curable material injection pipe 11,
Wash water supply pipe with the valve 22 of the return pipe 13 opened
Cleaning water is made to flow from 14 through the injection hole 10 through the tip of the injection pipe 11, and the curable material 6 filled in the injection hole 10 and the injection pipe 11 is removed through the return pipe 13 to prevent the next injection. Try not to occur. In addition, the injection hole facing the space 9
At the open end of the curable material 6, the curable material 6 is prevented from flowing back into the injection hole 10.

The hardened layer 6a for the tunnel excavation wall surface 8
As the lining work proceeds, the temporary pipe 1 is sequentially pulled out and removed on the side of the reaching shaft B. Thus, compatibility pit A,
The tunnel excavation wall surface 8 is covered with a lining.

[0025]

As described above, according to the present invention, the inner cylinder is integrally connected to the rear end of the temporary pipe laid in the tunnel, and the outer diameter of the inner cylinder is larger than that of the temporary pipe. Also, a cylindrical formwork having a small diameter is slidably fitted, and a curable material is injected into the gap between the cylindrical formwork and the tunnel excavation wall surface. Since the curable material is cured while reciprocating to form a cylindrical hardened layer, and the hardened layer is continuously applied to the tunnel excavation wall surface as the temporary pipe advances, it is connected to the rear end of the temporary pipe. Not only can the cylindrical formwork be accurately reciprocated by using the outer peripheral surface of the inner cylinder as a guide, but the curable material adheres to the outer peripheral surface of the cylindrical formwork by the reciprocating motion of the cylindrical formwork, It is possible to prevent the resin from hardening and to fill the voids with a hardenable material. , It is possible to form a cured layer of a predetermined thickness having excellent strength at uniform and fixed integrally cured in this state to the tunnel excavation wall.

Further, when the curable material is further cured to form a cured layer which is cured to a certain strength, the cured layer is reciprocated as described above to reciprocally move the cylindrical form. Since it is in a rim cutting state without adhering to,
When advancing the cylindrical formwork to the next lining site, there is no risk of cracking in the hardened layer, and the advancement of the cylindrical formwork along with the temporary pipe is performed smoothly to improve work efficiency. It can be achieved.

[Brief description of drawings]

FIG. 1 is a simplified vertical sectional side view showing a construction state,

FIG. 2 is a vertical sectional side view of a cylindrical formwork portion connected to a temporary pipe,

3 is a sectional view taken along line AA in FIG.

FIG. 4 is a sectional view taken along line BB in FIG.

5 is a sectional view taken along line CC in FIG.

FIG. 6 is a vertical cross-sectional side view showing a state in which a temporary pipe is buried.

[Explanation of symbols]

 1 Temporary pipe 3 Inner cylinder 5 Cylindrical form 6 Curable material 6a Hardened layer 7 Jack 8 Tunnel excavation wall surface 9 Void portion 10 Injection hole

Front page continued (72) Inventor Minoru Minoru 2-10-9 Izumi, Suginami-ku, Tokyo (72) Inventor Mikio Takeuchi 2-2-2 Matsuzaki-cho, Abeno-ku, Osaka City Okumura Gumi (72) Invention Reisuke Mishima 2-2-2 Matsuzaki-cho, Abeno-ku, Osaka-shi Okumura-gumi, a stock company (72) Inventor Hiroshi Wada 2--2 Matsuzaki-cho, Abeno-ku, Osaka-shi Okumura-gumi (72) Inventor Hayashi We are located in Okumura group, 2-2-2, Matsuzaki-cho, Abeno-ku, Osaka

Claims (4)

[Claims] 1. An inner cylinder is integrally connected to a rear end of a temporary pipe laid in a tunnel, and a cylindrical form having an outer diameter smaller than that of the temporary pipe is slid on an outer peripheral surface of the inner cylinder. Freely fit and inject a curable material into the gap between the cylindrical form and the tunnel excavation wall surface, then cure the curable material while reciprocating the cylindrical form in the front-back or circumferential direction. A method for lining a tunnel excavation wall surface, characterized in that a cylindrical hardened layer is formed thereby, and the hardened layer is continuously applied to the tunnel excavation wall surface as the temporary pipe advances. 2. A temporary tube is advanced together with the cylindrical formwork for a certain length in the tunnel direction each time the hardening of the curable material injected into the gap between the cylindrical formwork and the tunnel excavation wall surface is completed. The method for lining a tunnel excavation wall surface according to claim 1. 3. The temporary tube is integrally advanced with the cylindrical form at a speed that is synchronized with the curing speed of the curable material injected into the space between the cylindrical form and the wall surface of the tunnel excavation. The method for lining a tunnel excavation wall surface according to claim 1. 4. A front end of an inner cylinder having a constant length is integrally connected to a rear end of a temporary pipe laid in a tunnel, and a cylindrical form having a diameter smaller than that of the temporary pipe is connected to the inner cylinder. It is slidably fitted, and furthermore, a pipe for injecting a curable material is arranged in the gap between the tunnel excavation wall surface and the cylindrical form, and the cylindrical form is placed in the rear end of the temporary pipe. A lining device for a tunnel excavation wall surface, comprising a jack that slides in the front-rear direction or the circumferential direction.