JP2022027989A - Gantry trolley used for secondary lining of telescopic centre tunnel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gantry trolley used for the secondary lining of a telescopic centre tunnel capable of allowing workers to move smoothly back and forth and left and right on the floor of the tunnel, which is advantageous in increasing the efficiency of secondary lining work.

SOLUTION: A conveyor covering 40 that covers a continuous belt conveyor 14 suspended from a gantry trolley 10 on which workers can move in the front, back, left, and right directions of the tunnel. Since the conveyor covering 40 is suspended from the gantry trolley 10 and moves integrally with the gantry trolley 10, the workers can freely move in the front-back and left-right directions on a tunnel floor surface 16 in the section where the secondary lining work is performed. Thus, it is more advantageous in improving the work efficiency of the secondary lining work of the tunnel using the telescopic center.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2022,JPO&INPIT

Description

The present invention relates to a secondary lining method for a telescopic tunnel.

In recent years, in mountain tunnel construction, a continuous belt conveyor system is increasing in which a face is excavated by blasting and the generated shavings are carried out of the mine by using a continuous belt conveyor.
In tunnel construction, in addition to blasting with explosives at the face, various work is performed inside the tunnel, such as secondary lining of the tunnel wall surface using a centre and curing of the secondary lining concrete.
Then, work vehicles such as concrete mixer vehicles and concrete pump vehicles, and passenger vehicles such as light vehicles carrying workers pass through the tunnel between the tunnel entrance and the face.
On the other hand, the continuous belt conveyor is arranged in the middle part in the vertical direction in the tunnel on the side portion in the width direction in the tunnel, and the position and height in the width direction in the tunnel where the continuous belt conveyor is arranged are determined by the tunnel. In many cases, it is invariant over the entire length of the tunnel (Patent Documents 1 and 2).

In recent years, in order to improve the efficiency of tunnel construction, a secondary lining method using a telescopic center has been adopted.
In the secondary lining method using a telescopic center, one gantry trolley and two or more sets of formwork for placing secondary lining concrete are used.
Here, to explain the secondary lining method using telescopic centles, which is called the first formwork and the second formwork in the case of using two sets of formwork, first, the first formwork supported by the gantry trolley. If concrete is placed on the outside of the gantry, the first formwork will be self-supporting and the gantry crane and the first formwork will be separated.
Move the gantry trolley to the face side of the self-supporting first formwork, that is, advance the gantry trolley, assemble the second formwork with the gantry trolley on the face side of the first formwork, and to the outside of the second formwork. Place concrete.
Then, the second formwork is made independent, and the gantry crane and the second formwork are separated.
When the gantry trolley and the second formwork are separated, the gantry trolley is retracted and returned to the inside of the first formwork, and after the concrete is hardened, the first formwork is demolded and the diameter is reduced.
After the diameter was reduced, the gantry trolley supporting the reduced diameter 1st formwork was advanced, passed through the inside of the 2nd formwork, and positioned on the face side of the 2nd formwork to expand the diameter of the 1st formwork. Concrete is placed on the outside of the first formwork, the first formwork is made to stand on its own, and the first formwork and the gantry trolley are separated.
When the first formwork and the gantry trolley are separated, the gantry trolley is retracted and returned to the inside of the second formwork, and the second formwork after the concrete is hardened is demolded and reduced in diameter.
After the diameter was reduced, the gantry trolley that supported the reduced diameter 2nd formwork was placed inside the 1st formwork and on the face side of the 1st formwork, and the 2nd formwork was expanded to the 2nd. Concrete is placed on the outside of the formwork, the second formwork is made to stand on its own, and the second formwork and the gantry trolley are separated.
In this way, in the secondary lining method using the telescopic center, one gantry trolley and two or more sets of formwork for placing the secondary lining concrete are used, and the gantry trolley is placed along the longitudinal direction of the tunnel. Secondary lining is performed by repeating forward and backward movements.

In the secondary lining method using such a telescopic center, the gantry trolley repeatedly moves forward and backward along the longitudinal direction of the tunnel to perform the secondary lining, so that the continuous belt conveyor is installed in the width direction in the tunnel. If it is placed in the middle of the tunnel in the vertical direction on the side of the tunnel, the support mechanism that supports the continuous conveyor interferes with the gantry trolley, so it takes time to assemble and disassemble the support mechanism, and the efficiency of tunnel construction is improved. It will be disadvantageous in planning.
Therefore, in the secondary lining method using the telescopic center in this case, the continuous belt conveyor for carrying out the sill from the mine is arranged close to the side of the tunnel floor.

Japanese Unexamined Patent Publication No. 2015-7324 Patent No. 2899880

However, when the continuous belt conveyor for carrying out the sill from the mine is placed closer to the side of the tunnel floor, the worker can move in the width direction of the tunnel at the upper part of the gantry trolley, but on the tunnel floor, the tunnel It is difficult to move in the width direction, and it is disadvantageous in improving the efficiency of the secondary lining work, such as when placing concrete, expanding and contracting the center, and hindering the movement of people.
In particular, in the secondary lining method for tunnels using a telescopic centre, as described above, the gantry trolley is moved forward and backward along the longitudinal direction of the tunnel and alternately moved to the face side to perform the secondary lining work. , The frequency of movement of people around the gantry trolley is high, and the efficiency of the secondary lining work using the telescopic center cannot be improved.
The present invention has been made in view of the above points, and an object of the present invention is to allow workers to smoothly move in and out of the tunnel floor in the width direction of the tunnel and to improve the efficiency of secondary lining work. The purpose is to provide a secondary lining method for tunnels using an advantageous telescopic center.

In order to achieve the above-mentioned object, the invention according to claim 1 arranges a continuous belt conveyor for carrying out the sill out of the tunnel close to the side of the tunnel floor, and arranges a gantry trolley in the longitudinal direction and the width direction of the tunnel. Four front, rear, left and right legs supported by wheels at the lower ends of the tunnel, two vertical beams extending in the longitudinal direction of the tunnel and connecting the front and rear legs, respectively, and the width direction of the tunnel. It is composed of a plurality of horizontal beams extending between the left and right legs of the front and rear and connecting the vertical beams, and a floor supported by the vertical beams and the horizontal beams. The height to the lower surface of the beam is formed so that the work vehicle can come and go, and in the tunnel width direction, the work vehicle passes through the width in the tunnel width direction from the continuous belt conveyor to the front and rear legs on the opposite side. Two or more sets of molds for secondary lining concrete placement, which are formed to the size that can be formed to secure a work vehicle passage space and are arranged in an arch shape so as to be expandable and contractible, are placed along the longitudinal direction of the tunnel with the gantry trolley. When performing secondary lining using a telescopic centre that moves forward and backward alternately to the face side and advances the secondary lining toward the face side, the horizontal beam and vertical beam of the gantry trolley It is characterized in that it is suspended from the tunnel and covers the continuous belt conveyor, and a conveyor covering portion is provided on the continuous belt conveyor so that an operator can move in the front-back and left-right directions of the tunnel.
According to the second aspect of the present invention, the covering portion is connected to the staircase portions provided on both sides of the tunnel of the continuous belt conveyor in the width direction, and the upper end portion of the staircase portion is connected to the upper plate portion parallel to the floor surface of the tunnel. It is characterized by being composed of and.
The invention according to claim 3 is characterized in that a plurality of openable and closable inspection ports for inspecting the continuous belt conveyor are provided on the upper plate portion at intervals in the longitudinal direction of the tunnel.
The invention according to claim 4 is characterized in that a working space is secured at a height from the tunnel floor surface of the vertical beam on the side where the continuous belt conveyor is arranged in the width direction of the tunnel and the horizontal beam is joined. And.
The invention according to claim 5 secures a height from the tunnel floor surface of the vertical beam arranged on the opposite side of the continuous belt conveyor in the width direction of the tunnel and joins the horizontal beam to the tunnel width. The space between the front and rear legs located opposite to the continuous belt conveyor in the direction is secured as a parking space for a passenger car that can be parked without interfering with the work vehicle passing through the work vehicle passage space. It is characterized by.
The invention according to claim 6 is provided with a scaffolding that protrudes outward in the width direction of the tunnel between the front and rear legs arranged below the vertical beam, and the parking space is secured below the scaffolding. It is characterized by.

According to the invention of claim 1, since the continuous belt conveyor is covered with the conveyor covering portion, the worker can freely move over the continuous belt conveyor and freely move the tunnel floor surface in the front-back and left-right directions, and the work inside the tunnel can be carried out. It is advantageous in improving work efficiency.
Moreover, since the conveyor covering is suspended from the gantry trolley and moves integrally with the gantry trolley, the tunnel floor surface is moved in the front-back and left-right directions in the section over the entire length of the gantry trolley, in other words, in the section where the secondary lining work is performed. It can move freely, which is more advantageous in improving the work efficiency of the secondary lining work of the tunnel using the telescopic center.
According to the invention of claim 2, since the conveyor covering portion includes the upper plate portion and the staircase portions on both sides thereof, the worker can move more in the front-back and left-right directions of the tunnel on the tunnel floor surface. It will be smoother and more advantageous in enhancing the secondary lining work of the telescopic centre tunnel.
According to the third aspect of the present invention, since the inspection port is provided on the upper plate portion, it is possible to quickly respond to an accident such as a transport abnormality on the continuous belt conveyor inside the gantry carriage.
According to the invention of claim 4, the vertical beam on the side where the continuous belt conveyor is arranged does not become an obstacle when the worker moves in the front-back and left-right directions of the tunnel. That is, in the conventional gantry crane, since the vertical beam is provided near the tunnel floor surface, the continuous belt conveyor and the vertical beam are obstacles, and there is a problem that it takes time to move in the width direction of the tunnel. According to the invention of claim 4, by overcoming the conveyor covering portion and passing under the vertical beam, the tunnel floor surface can be freely moved in the front-back and left-right directions, and the secondary lining work of the telescopic centre type tunnel. It is more advantageous in increasing the work efficiency of.
According to the inventions of claims 5 and 6, a parking space for a vehicle carrying a worker can be secured inside the gantry trolley. That is, the side of the tunnel floor on the opposite side of the continuous belt conveyor is used as a large number of anchor bolts, a large number of lighting fixtures, a large number of lock bolts, a large number of support works, and a temporary storage place for materials and equipment for tunnel construction. It was difficult to secure a parking space for the car carrying the workers before and after the center, which was disadvantageous for the smooth movement of the workers, and it became more remarkable as the tunnel became longer. According to the inventions of claims 5 and 6, the parking space of the vehicle carrying the worker can be secured inside the gantry carriage, so that the worker can move smoothly, and in particular, the tunnel becomes long. In some cases, it is advantageous in increasing the efficiency of tunnel construction including secondary lining work of telescopic centre type tunnels.

It is sectional drawing which cut the state which the secondary lining work is performed on the gantry trolley in the plane orthogonal to the longitudinal direction of a tunnel. It is a front view of a gantry crane seen from the width direction of a tunnel. It is a top view of a part of a covering part.

Hereinafter, the secondary lining method for the telescopic centre type tunnel of the present invention will be described with reference to the drawings.
In FIG. 1, on the gantry trolley 10, one set of formwork 12 out of two sets of formwork for placing secondary lining concrete is deployed on the tunnel wall surface, and concrete for secondary lining is placed. The continuous belt conveyor 14 for carrying the slide out of the mine is arranged close to the right side of the tunnel floor surface 16.
The gantry trolley 10 has four front, rear, left, and right legs 18 that are spaced apart in the longitudinal and width directions of the tunnel and wheels 1802 are supported at the lower ends thereof, and front and rear legs that extend in the longitudinal direction of the tunnel and are left front and rear. Two vertical beams 20 that connect the 18 spaces and the front and rear legs 18 on the right side, respectively, and the left and right legs 18 on the front side and the left and right legs 18 on the rear side that extend in the width direction of the tunnel are connected, respectively. A plurality of horizontal beams 22 and a floor portion 24 supported by the vertical beam 20 and the horizontal beam 22 are provided.
In this embodiment, the front side shows the face side, the rear side shows the tunnel entrance side, and the left and right sides show both sides of the tunnel toward the tunnel face.

At the lower ends of the four legs 18, two wheels 1802 that roll the rail 1804 on the tunnel floor surface 16 are provided at intervals in the extending direction of the rail 1804.
The front right leg 18 and the rear right leg 18 are arranged outside the continuous belt conveyor 14 in the width direction of the tunnel.
The height from the tunnel floor surface 16 to the lower surface of the lateral beam 22 is formed with a height dimension that allows work vehicles 26 such as mixer trucks and concrete pump trucks to come and go, and the front left leg 18 and the rear left leg. The portion 18 and the continuous belt conveyor 14 are formed with a width dimension that allows the work vehicle 26 to pass through.
Therefore, there is a work vehicle passage space S1 below the lower surface of the lateral beam 22 and between the front left leg portion 18 and the rear left leg portion 18 and the continuous belt conveyor 14.

Further, the height of the left and right vertical beams 20 from the tunnel floor surface 16 and the joint position with the horizontal beam 22 from the tunnel floor surface 16 are formed so as to secure a lower space.
As a result, the vertical beam 20 on the right side, which is the side on which the continuous belt conveyor 14 is arranged in the tunnel width direction, is located at a position away from above the continuous belt conveyor 14, and the vertical beam 20 on the right side is working. It does not get in the way when the members move in the front, back, left and right directions of the tunnel.
Further, the vertical beam 20 on the left side, which is opposite to the continuous belt conveyor 14 in the tunnel width direction, is located at a position away from above the tunnel floor surface 16, and the worker moves in the tunnel width direction. Needless to say, the height of the vertical beam 20 on the left side and the joint position with the horizontal beam 22 are formed by securing a lower space so that the continuous belt conveyor 14 can be used in the tunnel width direction. The space between the left leg 18 in the front and the left leg 18 in the rear, which are located opposite to each other, is used as a parking space S2 for a passenger car that can be parked without interfering with the work vehicle 26 passing through the work vehicle passage space S1. I have secured it.

Further, the gantry trolley 10 has a tunnel width over the upper ends of the left leg 18 at the front and the left leg 18 at the rear, and over the upper ends of the right leg 18 at the front and the right leg 18 at the rear. An upper scaffold 30A for worker work protruding outward in the direction, over the upper and lower middle parts of the left leg 18 in the front and the left leg 18 in the rear, and the right leg 18 in the front and the right side in the rear. A lower scaffold 30B for worker work is provided so as to project outward in the width direction of the tunnel over the upper and lower intermediate portions of the leg portion 18.
Therefore, in the present embodiment, since the lower scaffolding 30B is provided over the upper and lower intermediate portions of the left leg portion 18 in the front and the left leg portion 18 in the rear, the parking space S2 works below the lower scaffolding 30B. It is a space where two light vehicles can be parked without interfering with the work vehicle 26 passing through the vehicle passage space S1.
In FIGS. 1 and 2, reference numeral 32 indicates a support jack, and reference numeral 34 indicates a wind tunnel.
Further, as shown in FIG. 2, a staircase connecting the end of the floor portion 24 opposite to the continuous belt conveyor 14 in the tunnel width direction and the tunnel floor surface 16 is provided, and a rail is provided at the lower end of the staircase 36. Wheels (not shown) that roll on 1804 are provided so that the gantry carriage 10 can be smoothly moved forward and backward when performing secondary lining work of a tunnel using a telescopic center.

Further, the gantry trolley 10 is provided with a conveyor covering portion 40 on which a worker can move on the continuous belt conveyor 14 in the tunnel width direction.
The conveyor covering portion 40 covers the entire length portion of the centre in the longitudinal direction of the continuous belt conveyor 14 located below the floor portion 24.
The conveyor covering portion 40 includes staircase portions 42 provided on both sides of the tunnel of the continuous belt conveyor 14 in the width direction, and an upper plate portion 44 connecting the upper ends of the staircase portions 42 and parallel to the tunnel floor surface 16. It is configured.
As shown in FIG. 3, the upper plate portion 44 is provided with a plurality of openable and closable inspection ports 46 at intervals in the longitudinal direction of the tunnel.
The inspection port 46 is composed of an opening 4602 formed in the upper plate portion 44 and a lid plate 4604 that opens and closes the opening 4602, and the lid plate 4604 is detachably attached to the upper plate portion 44 by a bolt 4606. ..
The upper plate portion 44 is suspended from the lateral beam 22 by several pillars 48 suspended in the longitudinal direction of the tunnel, and therefore the conveyor covering portion 40 is suspended from the lateral beam 22. There is.

According to this embodiment, the following effects are achieved.
Since the continuous belt conveyor 14 is covered with the conveyor covering portion 40, the worker can freely move over the continuous belt conveyor 14 and freely move the tunnel floor surface 16 in the front-back and left-right directions, thereby improving the work efficiency of the construction inside the tunnel. It becomes advantageous in.
Further, since the conveyor covering portion 40 is suspended from the lateral beam 22 of the gantry trolley 10 and moves integrally with the gantry trolley 10, it is a section over the entire length of the gantry trolley 10, in other words, a section where secondary lining work is performed. , The tunnel floor surface 16 can be freely moved in the width direction, which is more advantageous in improving the work efficiency of the secondary lining work of the tunnel using the telescopic center.

Further, in the present embodiment, the conveyor covering portion 40 is even configured to include the upper plate portion 44 and the staircase portions 42 on both sides thereof, so that the worker can move in the tunnel width direction on the tunnel floor surface 16. It will be smoother and will be more advantageous in enhancing the secondary lining work of the tunnel using the telescopic center.
Further, since the inspection port 46 is provided on the upper plate portion 44, it is possible to quickly respond to an accident such as a transport abnormality on the continuous belt conveyor 14 inside the gantry carriage 10, and a tunnel using a telescopic center. It will be more advantageous in improving the work efficiency of the work inside the tunnel including the secondary lining work.

Further, in the conventional gantry carriage 10, since the vertical beam 20 is provided near the tunnel floor surface 16, the operator must cross both the continuous belt conveyor 14 and the vertical beam 20 and the tunnel floor surface. It took time to move the tunnel in the width direction on 16, and it was disadvantageous in improving the efficiency of the secondary lining method of the tunnel using the telescopic center.
On the other hand, in the present embodiment, the height of the vertical beam 20 on the right side on the side where the continuous belt conveyor 14 is arranged from the tunnel floor surface 16 is the mounting height of the horizontal beam 22 from the tunnel floor surface 16. Since the determination was made in consideration of the work space, the vertical beam 20 on the right side does not become an obstacle when the worker moves in the width direction of the tunnel.
Therefore, by overcoming the conveyor covering portion 40 and passing under the vertical beam 20 on the right side, the tunnel floor surface 16 can be freely moved in the width direction, and the work efficiency of the secondary lining work of the telescopic centre type tunnel can be improved. It will be more advantageous in enhancing.

In tunnel construction, tunnel wall surface such as installation work of many lighting fixtures using anchor bolts, reinforcement work of tunnel wall surface using many lock bolts, primary lining of tunnel wall surface using many support works, etc. Various works are performed in the tunnel other than the secondary lining of the tunnel, and the side of the tunnel floor 16 on the opposite side of the continuous belt conveyor 14 has many anchor bolts, many lighting fixtures, many lock bolts, and many. It is used as a temporary storage place for materials and equipment, and it is difficult to secure a parking space S2 for light vehicles carrying workers, which is disadvantageous for smooth movement of workers, and if the tunnel becomes long. I see, it becomes remarkable.
In the present embodiment, the parking space S2 of the light vehicle carrying the worker can be secured inside the gantry carriage 10, so that the worker can move smoothly, especially when the tunnel becomes long. It is advantageous in improving the efficiency of tunnel construction including secondary tunnel lining work using a center.

The lower part of the right leg 18 on the front and the lower part 18 on the right side on the rear is composed of two leg divisions straddling the continuous belt conveyor 14 and the conveyor covering portion 40 in the width direction of the tunnel. It goes without saying that the two wheels may be supported at the lower end of the body.

10 Gantry trolley 12 Formwork 14 Continuous belt conveyor 18 Legs 20 Vertical beam 22 Horizontal beam 24 Floor 26 Work vehicle 30A Upper scaffold 30B Lower scaffold 40 Cover 42 Stairs 44 Upper plate 46 Inspection port S1 Work vehicle passage space S2 Parking space

The present invention relates to a gantry trolley used in a secondary lining method for a telescopic tunnel.

However, when the continuous belt conveyor for carrying out the sill from the mine is placed closer to the side of the tunnel floor, the worker can move in the width direction of the tunnel at the upper part of the gantry trolley, but on the tunnel floor, the tunnel It is difficult to move in the width direction, and it is disadvantageous in improving the efficiency of the secondary lining work, such as when placing concrete, expanding and contracting the center, and hindering the movement of people.
In particular, in the secondary lining method for tunnels using a telescopic centre, as described above, the gantry trolley is moved forward and backward along the longitudinal direction of the tunnel and alternately moved to the face side to perform the secondary lining work. , The frequency of movement of people around the gantry trolley is high, and the efficiency of the secondary lining work using the telescopic center cannot be improved.
The present invention has been made in view of the above points, and an object of the present invention is to allow workers to smoothly move in the width direction of the tunnel on the tunnel floor surface and to improve the efficiency of the secondary lining work. The purpose is to provide a gantry bogie used for the secondary lining method of a tunnel using an advantageous telescopic center.

In order to achieve the above-mentioned object, the invention according to claim 1 uses a telescopic centle for secondary lining of a tunnel in which a continuous belt conveyor for carrying out the sill from the mine is placed close to the side of the tunnel floor. It is a gantry trolley used when performing in the secondary lining method used, and the gantry trolley extends in the vertical direction at intervals in the longitudinal direction and the width direction of the tunnel, and their lower ends are supported by wheels. Four legs on the front, back, left and right, and two vertical beams extending in the longitudinal direction of the tunnel above the tunnel floor and connecting the front and rear legs on the left side and the front and rear legs on the right side, respectively. , Multiple horizontal beams extending in the width direction of the tunnel above the tunnel floor and connecting the front left and right legs and the rear left and right legs, respectively, and their vertical and horizontal beams. It is configured to include a floor portion supported by the tunnel floor surface and located above the tunnel floor surface, and the height from the tunnel floor surface to the lower surface of the floor portion and the lower surface of the lateral beam is a height dimension that allows a work vehicle to come and go. At the same time as being formed, the width in the tunnel width direction between the front and rear legs opposite to the continuous belt conveyor in the tunnel width direction and the tunnel width direction to the continuous belt conveyor is formed in a width dimension that allows a work vehicle to pass through. A work vehicle passage space is secured on the lower surface and below the vertical beam and the horizontal beam, and the gantry trolley is suspended from the trolley to cover the continuous belt conveyor, on which the worker can move in the tunnel width direction. It is characterized in that a covering portion is provided.
According to the second aspect of the present invention, the covering portion is connected to the staircase portions provided on both sides of the tunnel of the continuous belt conveyor in the width direction, and the upper end portion of the staircase portion is connected to the upper plate portion parallel to the floor surface of the tunnel. It is characterized by being composed of and.
The invention according to claim 3 is characterized in that a plurality of openable and closable inspection ports for inspecting the continuous belt conveyor are provided on the upper plate portion at intervals in the longitudinal direction of the tunnel.
The invention according to claim 4 is characterized in that a working space is secured at a height from the tunnel floor surface of the vertical beam on the side where the continuous belt conveyor is arranged in the width direction of the tunnel and the horizontal beam is joined. And.
The invention according to claim 5 secures a height from the tunnel floor surface of the vertical beam arranged on the opposite side of the continuous belt conveyor in the width direction of the tunnel and joins the horizontal beam to the tunnel width. The space between the front and rear legs located opposite to the continuous belt conveyor in the direction is secured as a parking space for a passenger car that can be parked without interfering with the work vehicle passing through the work vehicle passage space. It is characterized by.
The invention according to claim 6 is provided with a scaffolding that protrudes outward in the width direction of the tunnel between the front and rear legs arranged in accordance with the vertical beam, and the parking space is secured below the scaffolding. It is characterized by.

Hereinafter, the gantry trolley used in the secondary lining method for the telescopic tunnel of the present invention will be described with reference to the drawings.
In FIG. 1, on the gantry trolley 10, one set of formwork 12 out of two sets of formwork for placing secondary lining concrete is deployed on the tunnel wall surface, and concrete for secondary lining is placed. The continuous belt conveyor 14 for carrying the slide out of the mine is arranged close to the right side of the tunnel floor surface 16.
The gantry trolley 10 has four front, rear, left, and right legs 18 that are spaced apart in the longitudinal and width directions of the tunnel and wheels 1802 are supported at the lower ends thereof, and front and rear legs that extend in the longitudinal direction of the tunnel and are left front and rear. Two vertical beams 20 that connect the 18 spaces and the front and rear legs 18 on the right side, respectively, and the left and right legs 18 on the front side and the left and right legs 18 on the rear side that extend in the width direction of the tunnel are connected, respectively. A plurality of horizontal beams 22 and a floor portion 24 supported by the vertical beam 20 and the horizontal beam 22 are provided.
In this embodiment, the front side indicates the face side, the rear side indicates the tunnel entrance side, and the left and right sides indicate both sides of the tunnel toward the tunnel face.

Claims (6)

A continuous belt conveyor for carrying out the sill from the mine is placed close to the side of the tunnel floor.
It extends vertically and vertically at intervals in the longitudinal and width directions of the tunnel, and its lower ends extend in the longitudinal direction of the tunnel with four front, rear, left, and right legs supported by wheels, and above the floor of the tunnel. Two vertical beams connecting the front and rear legs on the left side and the front and rear legs on the right side, respectively, and between the left and right legs on the front side extending in the width direction of the tunnel above the floor of the tunnel. A gantry trolley is provided including a plurality of horizontal beams connecting the left and right legs on the rear side, and a floor portion supported by the vertical beam and the horizontal beam and located above the tunnel floor surface. ,
The height from the tunnel floor surface to the lower surface of the floor portion and the lower surface of the lateral beam is formed with a height dimension that allows the work vehicle to come and go, and the front and rear legs opposite to the continuous belt conveyor in the tunnel width direction. And the width in the tunnel width direction to the continuous belt conveyor is formed with a width dimension that allows the work vehicle to pass through, and a work vehicle passage space is secured on the lower surface of the floor portion and below the vertical beam and the horizontal beam.
Two or more sets of formwork for secondary lining concrete placement, which are arranged in an arch shape and can be expanded and contracted, are alternately moved to the face side while moving the gantry trolley forward and backward along the longitudinal direction of the tunnel. When performing secondary lining using a telescopic centre that advances secondary lining toward the face side
The gantry trolley is provided with a conveyor covering portion suspended from the trolley, covering the continuous belt conveyor, and allowing workers to move in the tunnel width direction on the continuous belt conveyor.
A secondary lining method for tunnels using a telescopic center, which is characterized by this. The covering portion is composed of a staircase portion provided on one side or both sides of the tunnel of the continuous belt conveyor in the width direction, and an upper plate portion connecting the upper ends of the staircase portion and parallel to the floor surface of the tunnel.
The secondary lining method for a tunnel using the telescopic center according to claim 1. A plurality of openable and closable inspection ports for inspecting the continuous belt conveyor are provided on the upper plate portion at intervals in the longitudinal direction of the tunnel.
The secondary lining method for a tunnel using the telescopic center according to claim 2. In the width direction of the tunnel, the height from the tunnel floor surface of the vertical beam on the side where the continuous belt conveyor is arranged is secured to the working height on the conveyor covering portion, and then joined to the horizontal beam.
The secondary lining method for a tunnel using the telescopic center according to any one of claims 1 to 3. The height of the vertical beam arranged on the opposite side of the continuous belt conveyor in the width direction of the tunnel from the tunnel floor surface is secured above a certain level and then joined to the horizontal beam, and the continuous belt conveyor is joined in the tunnel width direction. The space between the front and rear legs located opposite to the above is secured as a parking space for a passenger car that can be parked without interfering with the work vehicle passing through the work vehicle passage space.
The secondary lining method for a tunnel using the telescopic center according to any one of claims 1 to 4. A scaffolding is provided below the floor and between the front and rear legs so as to project outward in the width direction of the tunnel.
The parking space is secured below the scaffolding,
The secondary lining method for a tunnel using the telescopic center according to claim 5.

Images