JPH1130095A - Lining device for tunnel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a rotary projection type lining device for a tunnel through which abrasion or choking troubles are hardly brought and the lining work can be efficiently executed. SOLUTION: Feed openings 8, 10 of a lining material and an accelerator are provided at the upper end of a vertically installed cylindrical casing 5 and the lining material supplied through the feed opening 8 is mixed with the accelerator by agitating member 7 while guiding it downward in the casing by its own weight. And a connection cylinder 18 between the easing 5 and the projecting part 3 arranged at the side of the casing is installed laterally at the lower part of the casing 5. The lining material moved down is transferred to the projecting part 3 through the connection cylinder 18 by the agitating members 7 arranged at the lower part and a rotary disc 13. An endless belt 21 is wound up on the outer periphery of an impeller 20 that impeller blades 28 are put between a pair of circular discs 26, 27 in particular and the endles belt 21 is guided by a plurality of pullies 22 so as to open a part of the impeller 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a tunnel lining device for lining a tunnel excavation wall with a cement-based lining material such as concrete.

[0002]

2. Description of the Related Art As a tunnel lining method, a so-called spraying method in which a lining material is sprayed on an excavated wall surface to perform a primary lining is adopted in the NATM method which is currently in a mainstream. Conventionally, this spraying method generally sprays the lining material by ejecting it from a nozzle together with compressed air. However, while the air-pressure spraying method has high construction efficiency, it adheres to the wall at high speed and is shocking, causing significant dust generation and rebound, deteriorating the underground environment, as well as spraying materials and mixing. The loss of material was large and it was difficult to perform efficient lining.

In order to suppress such dust and rebound, several types of lining devices have been developed in which a lining material is centrifugally projected using a high-speed rotating body such as an impeller without using compressed air. . However, these conventional projection-type lining devices have the disadvantages that the rotating parts are significantly worn, and that the lining material is solidified to cause a blockage trouble.

In order to solve the above problem, the applicant of the present application has previously proposed in Japanese Patent Application No. 8-178427 a tunnel lining device which is less likely to cause abrasion or blockage trouble. This lining device has an extremely high agitation capacity to mix with the quick-setting agent while lowering the lining material by the action of gravity.Moreover, since the lining material is smoothly discharged without stagnation, clogging troubles are prevented. Excellent in preventing.

[0005]

The tunnel lining device according to the present invention forms a series with the above-mentioned proposals. In particular, if the transfer of the lining material from the mixing section to the projection section is to be performed smoothly, the projection It is inevitable to adopt a form in which the mixing unit is housed in the center of the unit, and it is possible to improve the problem that the projection unit becomes large and bulky and requires a large amount of power to drive it. The purpose is to make the structure that can be constructed in a simple manner.

[0006]

In order to achieve the above object, according to the present invention, both inlets of a cement-based lining material and a quick-setting agent in a fluid state are provided at the upper end side of a vertical cylindrical casing. A mixing section for mixing the lining material introduced through the inlet with the quick-setting agent by stirring means while lowering the inside of the casing by the action of gravity, and the quick-setting agent flowing through the mixing section. The structure of the tunnel lining device having a projection unit for projecting the mixed lining material toward the excavation wall is provided by connecting the projection unit arranged at the lower part of the casing of the mixing unit to the projection unit arranged on the side of the casing. The tube is provided in the horizontal direction, and a feeding means for feeding the lining material mixed with the quick-setting binder to the projection unit through the connecting tube is provided. According to this, the configuration is such that the lining material can be transported in the horizontal direction toward the projection unit, and the mixing unit and the projection unit are arranged at positions shifted from each other in the horizontal direction. The required power can be reduced. Especially,
Preferably, the projection unit is rotatably mounted on the outer periphery of the connecting cylinder, and the configuration can be simplified.

Further, it is preferable that the stirring means is mounted on a rotating disk provided at a lower end side of the casing, and a lower portion of the stirring means including the rotating disk also serves as the feeding means. According to this, a drive mechanism dedicated to the feeding means is not required, and the configuration is simplified, and the configuration is complicated for transferring the lining material from the stirring means to the feeding means, or the lining material is stagnated. Can be prevented. Moreover, since the rotating disk at the lower end of the casing has a feed function, it is possible to prevent the lining material from staying at the lower end of the casing.

In addition, it is preferable that the stirring means is constituted by a shaft member disposed on the center line of the casing and a plurality of stirring members projecting radially from the shaft member. According to this, since the process from the introduction of the lining material to the mixing unit to the transfer to the projection unit is performed in a state where the lining material is lowered in the vertical direction, the part that may cause the lining material to stop is almost completely removed. Can be eliminated.

In addition, the shaft member is preferably made of a hollow material having a relatively large diameter. According to this, the peripheral speed of the surface of the shaft member is increased, and it is possible to prevent concrete from adhering to the surface by the action of a large centrifugal force. Moreover, since the speed of the stirring member also increases, the stirring efficiency increases,
The feeding performance of the lining material from the mixing section to the projection means is improved.

[0010] Further, the projecting section has an impeller having a plurality of blades interposed between a pair of disks, an endless belt wound around the outer periphery of the impeller, and a part of the impeller is released. It is preferable to have a plurality of pulleys for guiding the endless belt as described above. According to this, since the projection direction of the lining material is limited to the open portion of the impeller, it is possible to efficiently form a desired lining layer on the tunnel excavation surface.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 shows a tunnel lining device constructed according to the present invention. This tunnel lining device 1 includes a mixing section 2 for mixing a quick-setting agent into concrete as a lining material, and a concrete mixed with the quick-setting agent flowing through the mixing section 2 to form an excavation wall of a tunnel to be lined. And a base unit 4 for holding the mixing unit 2 and the projection unit 3 provided integrally with each other on a base machine described later in detail.

The mixing section 2 includes a vertically arranged cylindrical casing 5.
And a shaft member 6 arranged at the center line position of the casing 5 and a round bar-shaped stirring member 7 protruding radially from the shaft member 6. The casing 5 has a cylindrical side wall 5.
a and upper and lower disk-shaped upper and lower walls 5b and 5c respectively closing the upper and lower openings.

A material introduction port 8 is opened at an upper portion of the side wall 5a of the casing 5, and concrete from a material tank (not shown) is supplied into the casing 5 through a material supply pipe 9 connected thereto. It has become. In the center of the upper wall 5b of the casing 5, a quick-setting agent introduction port 10 is opened, and a quick-setting agent from a quick-setting agent tank (not shown) through a quick-setting agent supply pipe 11 connected thereto. Is supplied to the inside of the casing 5. The quick-setting agent supplied here may be either a liquid or a powder, by air current transport, or a powdery one using a flexible screw conveyor or the like having a ribbon-type screw in a flexible tube. The liquid thing is conveyed from the quick-setting agent tank to the casing 5 by pumping or the like.

A cylindrical barrier 12 having a cylindrical shape concentric with the casing 5 is suspended from the periphery of the opening of the quick-setting agent introduction port 10 to a position close to the top of the shaft member 6, and the lower end opening thereof is formed. It is located below the material inlet 8 by a required dimension. As a result, even if the quick-setting agent flies or the concrete containing the quick-setting agent jumps up due to the stirring operation of the stirring member 7, the quick-setting agent does not reach the periphery of the material introduction port 8, and the material introduction port 8 does not. Hardening of the concrete staying in the vicinity, including the quick-setting agent, is prevented.

The shaft member 6 is formed of a hollow material having a large diameter, and has a substantially conical top. The shaft member 6 is a rotating disk 1 having a diameter slightly smaller than the inner diameter of the casing 5.
3 and is rotatably supported relative to the lower wall 5c of the casing 5 via a rotating shaft 14 on the lower surface of the rotating disk 13. A mixing unit driving motor 15 provided on the lower wall 5 c of the casing 5 is connected to the rotating shaft 14 so that the shaft member 6 is driven to rotate together with the stirring member 7 and the rotating disk 13. .

A plurality of agitating members 7 are provided at predetermined intervals in the axial direction over the entire length of the shaft member 6 while sequentially changing the protruding angle by 90 degrees. It protrudes to a position close to the surface, and scrapes off the concrete adhering to the inner surface of the casing 5. The distance between the tip of the stirring member 7 and the inner peripheral surface of the casing 5 is preferably about 2 to 5 mm.

At the top of the shaft member 6, a cylindrical barrier 1 is provided.
2 and a second wiping member 17 corresponding to the inner peripheral surface of the side wall 5 a of the casing 5.
Are provided. These first and second wiping members 16
Reference numerals 17 each extend in the vertical direction at a slight distance from the outer peripheral surface of the barrier 12 and the inner peripheral surface of the side wall 5a, and these surfaces are interlocked with the rotation of the shaft member 6. It is designed to rotate along. Thereby, the barrier 12
Concrete that has adhered to the outer peripheral surface of the casing and the upper inner peripheral surface of the casing 5 that cannot be wiped by the stirring member 7 can be scraped off.

At the lower part of the side wall 5 a of the casing 5, a cylindrical connecting cylinder 18 for projecting the concrete mixed with the quick-setting agent in the casing 5 to the rotary projection unit 3 is protruded sideways.

As shown in FIG. 3, the projecting section 3 has an impeller 20, an endless flat belt 21 wound around the outer periphery of the impeller 20, and an inner side of the impeller 20 which is released in one direction. Four pulleys 22 for guiding the flat belt 21, a pair of frame plates 23 and 24 for holding these pulleys 22 so as to be rotatable relative to each other, and an inner frame plate 24
And a pulley drive motor 25 mounted on the pulley.

The impeller 20 has a disk-shaped outer plate 26 and an annular inner plate 2 having a circular hole at the center and opposed to the outer plate 26.
7, and a plurality of blades 28 provided radially between the outer plate 26 and the inner plate 27 as shown in FIG. The inner plate 27 is connected to the connecting cylinder 18 via a bearing.
Are supported so as to be relatively rotatable with respect to

The impeller 20 is driven to rotate in conjunction with a flat belt 21 driven by a pulley driving motor 25 connected to one of the four pulleys 22. The pulley drive motor 25 has a variable number of rotations and is capable of normal and reverse rotation.

The inner frame plate 24 is supported so as to be rotatable relative to the connecting cylinder 18 via a bearing. An external gear 29 is provided on the frame plate 24 so as not to rotate relatively. As shown in FIG. 2, an output gear of a frame driving motor 31 is meshed with the external gear 29, and the entire projection unit 3 is relatively rotated with respect to the connecting cylinder 18 by the frame driving motor 31. Thus, the opening of the impeller 20 can be displaced in the circumferential direction to adjust the concrete projection direction.

A guide body 32 having a substantially triangular cross section is provided between the two frame plates 23 and 24 so as to face the open portion of the impeller 20. The guide body 32 limits the discharge angle of the concrete and prevents the concrete from scattering over a wide range.

The base section 4 comprises a base section 33 fixed to the mixing section 2 and the projection section 3 and a connecting section 34 for connecting to a base machine. The base section 33 and the connecting section 34 form an impeller. 3 are connected so as to be relatively rotatable about an axis parallel to the rotation axis. The connecting portion 34 is provided with a hinge hole 35 connected to the arm of the base machine, and a hinge hole 36 connected to an actuator for tilting the apparatus up and down with the hinge hole 35 as a fulcrum. .

In the lining apparatus 1 thus constructed, the concrete supplied to the casing 5 through the material supply pipe 9 is freely introduced into the large-diameter casing from the material inlet 8 at the upper part of the casing 5. More and more
It falls freely without filling the inside of the casing 5.
On the other hand, the quick-setting agent supplied through the quick-setting agent supply pipe 11 passes through the barrier 12, descends from the lower end opening thereof to around the top of the shaft member 6 having a substantially conical shape, and is dispersed in all directions.

The concrete that has fallen from the material introduction port 8 is turned into droplets by the rotating operation of the upper stirring member 7, and the particles of the quick-setting agent floating in the casing 5 adhere to the concrete droplets. Is mixed with the quick-setting admixture by stirring. At this time, the concrete is pushed outward by the action of the centrifugal force, and is stirred by the scraping operation at the tip end of the stirring member 7 while descending mainly along the inner peripheral surface of the casing 5. Therefore, the descent speed is relatively low, and a sufficient residence time for obtaining an appropriate stirring effect is secured.

Also, since the casing 5 is not filled with concrete, the shaft member 6 can be rotated at a high speed with a small power, and since the shaft member 6 is hollow and has a relatively large diameter, The speed of the stirring member 7 is high, and an extremely high stirring effect can be obtained. Therefore, the amount of the quick-setting agent used can be reduced, and the generation of dust due to the excessive quick-setting agent can be reduced, and also the rebound and the early strength of the lining due to the shortage of the quick-setting agent can be prevented.

Further, since the peripheral velocity on the surface of the shaft member 6 is high and a large centrifugal force acts thereon, it is possible to prevent concrete from adhering to the surface of the shaft member 6. Further, since the casing 5 is not filled with concrete, the stirring member 7
Wear is relatively small.

At the time of stirring and mixing the concrete and the quick setting agent,
The concrete splattered on the inner peripheral surface of the casing 5 is scraped off by the tip of the stirring member 7, but the concrete splattered above the stirring member 7 that adheres to the outer peripheral surface of the barrier 12 is the first concrete. What is scraped off by the wiping member 16 and adhered to the inner peripheral surface of the casing 5 is scraped off by the second wiping member 17. In addition, by continuously performing these wiping operations, a film made of concrete cement is formed on the surface of the member, whereby wear can be effectively prevented.

The concrete that has been sufficiently mixed with the quick-setting binder and has reached the lower part of the casing 5 passes through the inside of the connecting cylinder 18 by the centrifugal force given by the rotating operation of the lower stirring member 7, and the center of the impeller 20. It is thrown into. Then, the concrete moves toward the outer peripheral side by the action of gravity and centrifugal force in the impeller 20 and is pressed against the flat belt 21. While the flat belt 21 is in contact with the outer peripheral surface of the impeller 20, the concrete moves on the flat belt 21 by centrifugal force so that the concrete adheres to the flat belt 21.
Is discharged from the outer peripheral surface of the impeller 20 in a substantially tangential direction.

Therefore, when the present apparatus 1 is operated with the impeller 20 facing the opening of the excavation wall of the tunnel to be lined, concrete is projected in small blocks within a predetermined angle range, and the concrete collides with the excavation wall and collides with the excavation wall. A concrete lining layer which spreads in a thin film form, is deposited one after another, and has a slight variation in thickness in the circumferential direction is formed with a predetermined width. This concrete lining layer can be formed to have a uniform thickness by gradually displacing the projection position in the horizontal direction, and further reciprocating up, down, left and right can make the thickness more uniform. it can. At this time, the rebound of dust and concrete, which are generated in the air-pressure-type spraying method, is greatly suppressed.

FIG. 4 shows a construction procedure when actually lining the excavation wall of a tunnel using the present apparatus 1.
And FIG. Here, a concrete lining is constructed as a primary lining of an upper half section having a semicircular shape excavated in advance.

The apparatus 1 is held by a self-propelled base machine 41 as shown in FIG. This base machine 4
1 includes a boom 43 supported by an upper swing body 42 so as to be able to turn around a rotation axis in the front-rear direction of the vehicle body, and an arm 44 pivotally attached to a tip end of the boom 43 so as to be vertically tiltable. Arm 4
The device 1 is attached to the tip of the device 4.

The boom 43 of the base machine 41 has a structure that can be swiveled by a built-in actuator and can expand and contract in the axial direction. On the other hand, the arm 44
Is an actuator 45 provided along its upper edge
Is operated up and down. The actuator 46 provided along the lower edge of the arm 44 tilts the device 1 attached to the tip of the arm 44 up and down to adjust its posture.

The apparatus 1 held by such a base machine 41 includes a concrete and quick-setting agent tank (not shown) installed on the wellhead side of the base machine 41 and concrete and quick-setting agent from a pressure pump. The supply pipes 9 and 11 are connected.

First, the base machine 41 is run and the arm 44 is operated to position the impeller 3 of the apparatus 1 at the lining start position at a predetermined distance from the excavation wall surface. At this time, as shown in FIG.
The base machine 41 is arranged such that the turning axis of the base machine substantially coincides with the center position in the width direction of the tunnel.

The concrete is projected while turning the boom 43 in the circumferential direction from the side of the tunnel to the top. At this time, the base 33 and the connecting portion 34 of the base portion 4 are relatively rotated with the turning of the boom 43 so that the center line of the casing 5 is held substantially vertically (FIG. 1).
reference). At the same time, the projection unit 3 is rotated relative to the casing 5 so that the opening of the impeller 20 faces the excavation wall surface to adjust the projection direction. Also, the boom 4 is adjusted so that the distance between the excavation wall of the tunnel and the projection unit 3 is substantially constant.
The boom 43 expands and contracts with the turning of the third arm. In FIG. 5, the rotation direction of the impeller 20 is reversed between the left side and the right side so that the projection is performed symmetrically with the left side.

By turning the boom 43 in this way and gradually displacing the concrete projection position in the circumferential direction,
A lining layer having a uniform thickness in the circumferential direction can be formed smoothly and efficiently.
Is moved forward or backward to gradually displace the projection position in the axial direction of the tunnel, thereby forming a lining layer having a predetermined width and a uniform thickness in the axial direction of the tunnel. At this time, the lining layer having a desired thickness can be constructed by appropriately adjusting the number of repetitions of the turning operation of the boom 43 and the number of repetitions of the forward / backward movement of the base machine 41.

Further, since concrete can be projected with a certain degree of directivity, it is possible to intensively project concrete, for example, into a pit on the excavated wall surface caused by excessive excavation, and to smooth the surface of the lining layer. It is effective in forming. Similarly, by intensively projecting, it is possible to partially thicken a portion where the ground may be weakly collapsed.

Further, in order to partially project the beam on the backside of the support, the actuator 46 is extended to tilt the apparatus 1 upward, and the axis of the impeller 20 is tilted.
Concrete can be projected in a desired direction. On the other hand, the corner of the face can be dealt with by shortening the actuator 46 and tilting the apparatus 1 downward.

[0042]

As described above, according to the present invention, the lining material can be transported in the lateral direction toward the projection section,
Since the mixing unit and the projecting unit are arranged at positions shifted from each other in the horizontal direction, it is possible to reduce the diameter of the projecting unit and reduce the power required for its driving, which has a great effect on efficient construction. Can play. In particular, when the projection unit is rotatably mounted on the outer periphery of the connecting cylinder, it is effective in simplifying the configuration.

Further, if a stirring means is mounted on a rotating disk provided on the lower end side of the casing, and a lower portion of the stirring means including the rotating disk also serves as the feeding means, a driving mechanism dedicated to the feeding means is provided. It becomes unnecessary, the configuration is simplified,
The transfer of the lining material from the agitating means to the feeding means can be prevented from complicating the configuration or causing the lining material to stay. Moreover,
Since the rotating disk at the lower end of the casing has a feeding function, it is possible to prevent the lining material from staying at the lower end of the casing.

In addition, when a plurality of agitating members projecting radially from a shaft member disposed on the center line of a vertically placed cylindrical casing are provided as agitating means, the lining material is introduced into the mixing section and then the projection section. The process of transporting the lining material is performed in a state where it descends in the vertical direction.Therefore, it is possible to almost completely eliminate the portion that may cause the lining material to stay, which is extremely remarkable in preventing wear and blockage. Has a significant effect.

In addition, if the shaft member is made of a hollow material having a relatively large diameter, the peripheral speed of the surface of the shaft member is increased, so that a large centrifugal force prevents the concrete from adhering to the surface. can do. In addition, since the speed of the stirring member is also increased, the stirring efficiency is improved, and the performance of feeding the lining material from the mixing section to the projection means is improved.

Further, the projection unit winds the endless belt around the outer periphery of the impeller in which a plurality of blade plates are interposed between the pair of disks, and forms the endless belt so that a part of the impeller is released. In this case, since the direction of projection of the lining material is limited, a desired lining layer can be efficiently formed on the tunnel excavation surface.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a lining device for a tunnel configured according to the present invention.

FIG. 2 is a cross-sectional view taken along line II-II shown in FIG.

FIG. 3 is a cross-sectional view taken along line III-III shown in FIG.

FIG. 4 is a cross-sectional view showing a construction state of lining by the tunnel lining device shown in FIG. 1 along a tunnel axis.

FIG. 5 is a cross-sectional view showing a construction state of the lining similar to that shown in FIG. 4, which is divided in a direction orthogonal to an axis of the tunnel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lining device for tunnel 2 Mixing part 3 Projection part 4 Base part 5 Casing, 5a side wall, 5b upper wall, 5c lower wall 6 Shaft member 7 Stirring member 8 Material introduction port 9 Material supply pipe 10 Quick setting agent introduction port 11 Quick setting Agent supply pipe 12 Barrier 13 Rotating disk 14 Rotating shaft 15 Mixing unit drive motor 16 First wiping member 17 Second wiping member 18 Contact cylinder 20 Impeller 21 Flat belt 22 Pulley 23/24 Frame plate 25 Pulley driving motor Reference Signs List 26 outer plate 27 inner plate 28 blade plate 29 external gear 31 frame driving motor 32 guide body 33 base 34 connecting part 35/36 hinge hole 41 base machine 42 upper turning body 43 boom 44 arm 45/46 actuator

Claims (6)

[Claims] At least one inlet for a cement-based lining material and a quick-setting agent in a fluidized state is provided at the upper end side of a vertically placed cylindrical casing, and the lining material introduced through the inlet is subjected to the action of gravity. A mixing unit for mixing with the quick-setting agent by the stirring means while lowering the inside of the casing, and a projecting unit for projecting the lining material mixed with the quick-setting agent through the mixing unit toward the excavation wall surface. A tunnel lining device, wherein a lower part of a casing of the mixing section is provided with a connecting cylinder with the projection section arranged on a side of the casing in a lateral direction, and a lining material mixed with a quick-setting binder. A lining device for a tunnel, further comprising a feeding means for transferring the material to the projection unit via the connecting cylinder. 2. The tunnel lining device according to claim 1, wherein the projection unit is rotatably mounted on an outer periphery of the connecting cylinder. 3. The stirring means is mounted on a rotating disk provided on a lower end side of the casing, and a lower part of the stirring means including the rotating disk also serves as the feeding means. 3. The lining device for a tunnel according to claim 1 or 2. 4. The stirring means according to claim 1, wherein said stirring means is constituted by a shaft member disposed on a center line of said casing, and a plurality of stirring members projecting radially from said shaft member. 4. The tunnel lining device according to any one of 3. 5. The lining device for a tunnel according to claim 4, wherein the shaft member is made of a hollow material having a relatively large diameter. 6. An impeller in which a plurality of blades are interposed between a pair of disks, an endless belt wound around an outer periphery of the impeller, and a part of an inner space of the impeller is released. The lining device for a tunnel according to any one of claims 1 to 5, further comprising a plurality of pulleys for guiding the endless belt so that the endless belt is guided.