JP3713556B2 - Tunnel widening equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is used for widening an existing mountain tunnel that penetrates a mountain range or a hill, and is used for crushing the tunnel lining and excavating the surrounding ground, and a protector for securing a passage in the tunnel. The present invention relates to a facility for widening a tunnel including a gantry placed on the protector for installing the device.
[0002]
[Prior art]
In order to widen a narrow existing mountain tunnel, after crushing the lining of the existing tunnel and excavating the surrounding ground using machinery and blasting, the crushing and excavation site has a new cross section that is larger than the existing tunnel. A new tunnel is constructed, and the existing tunnel is replaced with a new tunnel.
[0003]
Conventionally, a protector, breaker, cutting machine, drilling machine for securing a passage for securing pedestrians, vehicles, etc. in the existing tunnel when crushing the lining of the existing tunnel and excavating the surrounding ground It is a mount on which a spraying device such as a spraying manipulator for processing the tunnel wall surface after excavation is installed, and is mounted on a protector so as to be able to travel in its extending direction. There has been proposed a tunnel widening facility equipped with a mounted base (Japanese Patent Laid-Open No. 2000-328871).
[0004]
According to this, by moving the gantry in the extending direction on the protector, it is possible to sequentially move work points such as crushing, excavation, and blowing of the existing tunnel in the axial direction of the tunnel.
[0005]
Operations such as tunnel crushing, excavation, and spraying are performed while the gantry rests on the protector. The conventional equipment further includes a plurality of legs provided on the pedestal and extending downward on the side of the protector, and an outrigger attached to the lower end of each leg. It is supported on the road surface of the tunnel and is kept stationary with respect to the protector.
[0006]
By the way, the conventional equipment has a problem that the leg portion extending from the gantry narrows the work space in the tunnel space, particularly the work space on the side of the protector, and is placed in the work space on the side of the protector. Materials to be scraped, belt conveyors for shear transport, shear transport vehicles, and the like become obstacles to the progress of the legs, and the smooth progress of the mount on the protector may be hindered.
[0007]
[Problems to be solved by the invention]
Accordingly, an object of the present invention is to provide a tunnel widening facility that can more effectively utilize the space in an existing mountain tunnel that is to be widened.
[0008]
[Means for Solving the Problems]
A tunnel widening construction facility according to the present invention is placed in an existing mountain tunnel to be widened, and is mounted on a protector having a top portion and both side portions that define a passageway, and can travel in the extending direction on the protector. A gantry on which a device used for crushing the tunnel lining and excavating the surrounding ground is installed, and a fixing means for releasably fixing the gantry to the protector.
[0009]
The fixing means includes one or a plurality of protrusions provided on each side portion of the protector and extending in the extending direction; an extension portion provided on the mount and extending so as to embrace the protrusion; the protrusion of the protector and the mount And a plurality of jacks that are arranged between the extending portions and are supported by one of the protrusion and the gantry and extend in the vertical direction.
[0010]
Preferably, the protector has a shoulder portion extending obliquely downward from the top portion and each side portion thereof, and the extension portion of the gantry includes an inclined portion extending along the shoulder portion of the protector. Moreover, the said mount frame shall be equipped with the overhang | projection part extended horizontally from each extension part.
[0011]
The facility according to the present invention may further include a belt conveyor supported by the frame and extending along the frame. The belt conveyor preferably has a length dimension that is longer than the total length of the truck used to carry the shear generated by crushing the tunnel lining and excavating the surrounding ground. More preferably, a part of the belt conveyor is swingable with respect to the remaining part.
[0012]
Operation and effect of the invention
According to the present invention, the protector installed in the mountain tunnel to be widened is provided with the fixing means for releasably fixing the cradle that can run on the protector, so that the tunnel is crushed, excavated, etc. During the operation, the frame can be held stationary by the protector so that the pedestal does not move or tilt. For this reason, the presence of the legs and outriggers on the side of the protector in the conventional equipment and the accompanying reduction in the work space on the side of the protector, the materials placed in the work space, the progress of the pedestal due to the shear transport vehicle, etc. It is possible to eliminate this problem and to ensure the smooth progress of the shear transport vehicle in the work space.
[0013]
The fixing means includes a protrusion provided on each side of the protector, an extension provided on the pedestal and extending to embrace the protrusion, and disposed between the protrusion and the extension, and the protrusion and the When it is composed of a plurality of jacks that are supported by any one of the pedestals and extend in the vertical direction, the jacks are pressed against the protrusions and the extension parts at both ends by the extension operation of the jacks, and the contraction thereof. By releasing the pressure contact by operation, the frame can be fixed to the protector and released easily and reliably.
[0014]
In addition, when the pedestal placed in a movable state by the contraction operation of the jack is tilted during the movement, the tilt is corrected by mutual contact between the protrusion or the extension and the jack, In addition, excessive inclination is prevented from occurring. The work space under the gantry can be made wider by placing the height positions of the protrusions and the extension part higher.
[0015]
When the protector is provided with a shoulder extending from the top to the side thereof and extending obliquely downward, and when an inclined portion extending along the shoulder of the protector is provided at the extension of the mount, the top of the mount A larger working space can be secured.
[0016]
When an overhanging portion that extends horizontally from the extending portion of the gantry is provided, the area of the work floor for the operation of crushing the tunnel lining and excavating the surrounding ground can be increased.
[0017]
When the belt conveyor is supported on the gantry, it is not necessary to install a belt conveyor on the road surface in the tunnel that defines the working space on the side of the protector, thereby making it possible to use the working space more effectively. .
[0018]
The shear generated by the widening work of the tunnel can be transported to a truck which is a shear transport vehicle waiting in a work space on the side of the protector via the belt conveyor supported by a mount on the protector. . The belt conveyor is located above the track and has a length dimension that is longer than the total length of the track, so that the belt conveyor is located at a location beyond the length of at least one track from the temporary accumulation or deposition location of the shear. The shear can be conveyed. For this reason, it is possible to transport and load the slurries in order from a truck far from the position where the sludge is accumulated, to a truck closer to the truck, where a plurality of trucks are waiting.
[0019]
As a result, even when a large amount of slip exceeding the loading amount of one truck occurs, the carry-out processing of the slip can be smoothly performed without delay. In addition, regarding the traffic control between the trucks entering and exiting the work space and the passing vehicles in the protector, the number of trucks entering and exiting at a time can be set to a plurality, thereby reducing the number of times and the time required for the replacement of the trucks. You can save. As a result, it is possible to increase the efficiency of carrying out the shear generated by the widening work of the existing mountain tunnel.
[0020]
When a part of the belt conveyor is swingable with respect to the remaining part, the part extends in a straight line with the remaining part, and the part is bent and inclined downward with respect to the remaining part. It can be. Under a straight line, the lower part can be used as a work space. Further, when placed in the inclined state, it is possible to facilitate the work of placing the shear on the belt conveyor.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Referring to FIG. 1, a horseshoe-shaped existing mountain tunnel 10 and a new horseshoe-shaped tunnel 12 that is newly constructed for widening the tunnel and has a cross section larger than that of the existing tunnel 10, respectively, It is shown with a solid line.
[0022]
The new tunnel 12 is constructed along the excavation wall surface after crushing the lining (not shown) of the existing tunnel 10 and excavating the surrounding ground 14. The crushing of the lining of the existing tunnel 10 and the excavation of the surrounding ground 14 (including excavation by blasting) and the construction of the new tunnel 12 are staged from one end (rear end) to the other end (front end) of the existing tunnel 10 Done. In addition, the surrounding ground 14 shown in the figure indicates an unexcavated one that remains on the other end side of the tunnel 10.
[0023]
In order to ensure the passage of the lining of the existing tunnel 10 and the excavation of the surrounding ground 14 as well as the passage of passersby and general vehicles in the vicinity and the safety thereof, a protector 16 that defines the passage is arranged in the existing tunnel 10. Has been. Further, on the protector 16, a gantry 18 for placing a crushing and excavating device described later used for the crushing and excavation is placed. The protector 16 and the gantry 18, and fixing means 30, 34, and 40 described later constitute a tunnel widening facility.
[0024]
The illustrated protector 16 has an inverted U-shaped cross-sectional shape as a whole, and its top portion 20 and both side portions 22 extend over the crushing / excavation site and its front and rear in the axial direction of the existing tunnel 10 ( The left side in FIG.
[0025]
The illustrated protector 16 further includes a shoulder portion 24 that extends from the top portion 20 and the side portions 22 thereof and extends obliquely downward. Although it is possible to provide a protector having a top part and two side parts orthogonal to each other without the shoulder part 24, when the shoulder part 24 is provided, there is no corner that appears when the shoulder part 24 is not provided. Therefore, a wider working space can be obtained above the protector 16.
[0026]
The protector 16 is disposed on a road surface 26 in the existing tunnel 10, and a side space 28 as a work space exists between the tunnel 10 and a wall surface (lining wall surface). In the illustrated example, the protector 16 is located at a substantially central portion in the transverse direction of the tunnel 10, but may be placed at a position other than the central portion as necessary.
[0027]
The protector 16 has one projection 30 formed of a ridge that continuously extends in the extending direction on each side portion (more specifically, the outer surface of both inner and outer side surfaces of each side portion) 22.
[0028]
It is desirable to arrange the protrusion 30 at a position higher than the side part 22 of the protector. As a result, a wider side space 28 can be obtained below the extended portion 34 provided on the gantry 18 that occupies substantially the same height as the protrusion 30, where construction materials and equipment, Tracks 50 and 52, a shaflower 54, and the like which will be described later can be disposed, and these do not hinder the movement of the gantry 18. In the illustrated example, the protrusion 30 is located immediately below the shoulder 24.
[0029]
The protrusion 30 may be composed of, for example, a plurality of protrusions extending intermittently instead of one protrusion extending continuously. Moreover, the cross-sectional shape of the said protrusion can be defined arbitrarily. In the illustrated example, it has a rectangular cross-sectional shape.
[0030]
The protector 16 is moved on the road surface 26 in the axial direction of the tunnel in accordance with the progress (advance) of the crushing and excavation. For this movement, in the illustrated example, a pair of rails (not shown) are laid on the road surface 26, and a plurality of pairs of wheels (not shown) that can travel on both rails under the side portions 22 of the protector. Is provided.
[0031]
The gantry 18 has a plate-like main body 32 on the top portion 20 of the protector 16 and opposed thereto, and a pair of extending portions 34 connected to the main body 32. Both extending portions 34 extend downward from the main body 32 so as to embrace the protrusions 30 located on both side portions 22 of the protector.
[0032]
Preferably, it further has a pair of overhang | projection parts 36 which each project horizontally from both the extending parts 34. According to this, it is possible to increase the installation space for the apparatus and the operation space on the gantry 18 above the side space 28.
[0033]
The gantry 18 can travel in the longitudinal direction on the protector 16. For this reason, in the illustrated example, a plurality of wheels 37 provided on the top 20 of the protector and capable of rolling on the two rails 35 extending in the extending direction are rotatably supported by the main body 32 of the gantry. .
[0034]
The gantry extension 34 has a recess 38 that embraces and receives the protector protrusion 30. The recess 38 extends in the extending direction of the gantry 18 and opens toward the side 22 of the protector.
[0035]
A plurality of jacks 40 are arranged between the extension portion 34 and the protrusion 30 of the protector, that is, in the recess 38 of the extension portion, spaced from each other in the extension direction. More specifically, each jack 40 is arranged vertically between the lower part of the extension part 34 and the protrusion 30 and supported by the extension part 34. The jack 40 includes a hydraulic jack such as a hydraulic jack, a screw jack, or the like. The jack 40 together with the projection 30 of the protector and the extension part 34 of the mount constitute a fixing means for releasing and fixing the mount 18 to the protector 16.
[0036]
When the illustrated jack 40 in a contracted state is extended until it comes into contact with the protrusion 30, the upper and lower ends of the jack 40 are pressed against the extended portion 34 and the protrusion 30, and the gantry 18 is substantially fixed to the protector 16. Can do. By this fixing, the gantry 18 can be held stationary on the protector 16 without being tilted, moved, etc. During this time, the existing tunnel 10 is destroyed using the crushing / excavating device described later, the excavation work of the surrounding ground, or further Subsequent spraying operations can be performed stably.
[0037]
On the other hand, the gantry 18 can be moved on the protector 16 under the jack 40 placed in the contracted state, that is, in the state where the fixing is released. The jack 40 abuts against the protrusion 30 of the protector when the gantry 16 is tilted when the gantry 16 is moved, and acts to limit the tilt of the gantry 16.
[0038]
Instead of the illustrated example, the jack 40 may be attached to the protrusion 30 of the protector and suspended from the protrusion.
[0039]
In the illustrated gantry 18, the extending portion 34 has an inclined portion 42 that extends along and above the shoulder portions 24 of the protector.
[0040]
As a result of providing the inclined portion 42 in each extending part of the gantry 18, it is possible to avoid the narrowing of the wide working space above the protector obtained by providing the shoulder 24 on the protector. However, it is optional to use a gantry that does not have the inclined portion 42, that is, a gantry in which the main body 32 and the extending portion 34 are orthogonal to each other.
[0041]
On the main body 22 of the gantry and each overhang portion 36, a breaker, a cutting machine, etc. used for crushing the lining of the existing tunnel 10, excavating the surrounding ground 14, charging the surrounding ground 14, etc. A crushing / excavating device such as a drilling machine, or a spraying device (not shown) such as a spraying manipulator is installed. The crushing / excavating device exerts a crushing / excavating action on the lining and the ground 14 located in front of the crushing / excavating device by an operation by a worker on the gantry 18.
[0042]
Part of the crushed pieces and excavated pieces (hereinafter collectively referred to as “slip”) generated by the crushing and excavating action fall on the mount 18, and the other part is the protector 16. , That is, a side space 28 between the protector 16 and the wall surface of the new tunnel 12 that appears due to the crushing and excavating action. The shear on the gantry 18 is artificially dropped into the side spaces 28 and is deposited on the bottom surfaces of the old and new tunnels 10 and 12 that define the side spaces 28.
[0043]
A belt conveyor 48 for conveying the shear is suspended and supported at the lower part of each overhang portion 36 of the gantry 18.
[0044]
Each side space 28 also provides a traveling space for trucks 50 and 52 such as dump trucks for receiving the shear conveyed by the belt conveyor 48 and loading it out of the tunnel 12. . The belt conveyor 48 supported by the overhanging portion 36 is at an upper position higher than the total height of the truck, that is, higher than the ceiling surface, and the shear can be discharged and dropped from the upper position onto the truck bed.
[0045]
The above-mentioned shear that falls and accumulates on the bottom surface of each side space 28 can be placed on the belt conveyor 48 by using, for example, a shrouder 54 that can be introduced into the side space 28. The shuffler 54 has a function of scooping and collecting the above-mentioned shear and further transferring it onto the belt conveyor 48.
[0046]
The illustrated belt conveyor 48 includes a first conveyor unit 56 that is fixed to and extends along the overhang 36 of the gantry, and a second conveyor unit 58 that is coupled to the first conveyor unit. Become. The shear is conveyed from the second conveyor unit 58 to the first conveyor unit 56.
[0047]
The second conveyor portion 58 is pivotally attached to the front end portion of the first conveyor portion 56 at the rear end portion thereof, and can swing around an axis 60 extending in a direction transverse to the gantry 18. The second conveyor portion 56 is also suspended at the front end portion of the gantry overhanging portion 36 via the chain block 62.
[0048]
The second conveyor section 58 can be swung clockwise from the tilted state shown in FIG. 2 until the chain block 62 is actuated to wind up the chain until it becomes horizontal under the overhanging section 36. it can. Under the horizontal state, the lower area can be used as a work space.
[0049]
Further, by feeding out the chain of the chain block 62, the second conveyor portion 58 can be swung counterclockwise from the horizontal state to be in the inclined state. The shear is received from the shroud 54 in this inclined state.
[0050]
It should be noted that the second conveyor portion 58 can be fixed so as to extend along the extension portion 36 of the gantry in the same manner as the first conveyor portion 56 without making the second conveyor portion 58 swingable. Whether the second conveyor unit 58 is non-oscillating or the second conveyor unit 58 is maintained in the horizontal state, the section 58 can be placed on the second conveyor. It is. The placement of the shear can be performed using suitable mechanical means.
[0051]
The second conveyor part 58 carries the shear received from the shafluder 54 onto the front end of the first conveyor part 56, and the first conveyor part 56 discharges the received shear from the rear end to the side space 28. .
[0052]
The released shear falls on the loading platform of the truck 52 waiting in advance under the first conveyor unit 56. Other trucks 50 are also waiting behind the truck 52 in the same manner.
[0053]
The belt conveyor 48 is set to have a total length, that is, a total length of both the first and second conveyor portions 56 and 58 longer than the total length of the track 52 at the front position. For this reason, it is possible to transfer the shear from the front position of the truck 52 to the truck 50 that waits at the rear position beyond the truck. The placement of the slip on the other track 52 is performed by moving the other track 52 to the trace where the track 50 full of the slip is moved backward.
[0054]
If multiple trucks that are in an unloaded state are placed on standby, even if a large amount of slip occurs that exceeds the loading amount of a single truck, it is possible to receive the slip with sufficient margin and carry it out smoothly. it can.
[0055]
The fully loaded track 50 can be moved out of the side space 28 of the protector together with the track 52 after waiting for the other tracks 52 to be fully loaded. Thereby, compared with the case where one truck is moved outside the side space 28, the number of times of traffic control with respect to the general vehicle outside the side space 28 can be reduced.
[0056]
The overall length of the belt conveyor 48 can be set longer. According to this, it is possible to make a larger number of trucks stand by in the side space 28 and transfer the shear over a distance exceeding the larger number of trucks. For example, if the total length of the belt conveyor is set to be longer than the length of two trucks, the shear is transferred to one truck waiting behind two standby trucks, and then loaded to the truck ahead of it Sequential shears can be transferred. When the overall length of the belt conveyor 48 is increased, the length of the gantry 18 that supports the belt conveyor 48 needs to be set larger.
[0057]
In the illustrated example, the side spaces 28 in which the truck can run are provided on both sides of the protector 16, and the belt conveyors 48 are supported by the overhang portions 36 on both sides of the gantry. When one side space 28 is relatively narrow, the belt conveyor 48 can be disposed only with respect to the other side space 28.
[Brief description of the drawings]
FIG. 1 is a front view of a tunnel widening facility according to the present invention.
FIG. 2 is a side view of the tunnel widening facility according to the present invention.
[Explanation of symbols]
10 Existing mountain tunnel 12 New tunnel 14 Surrounding ground 16, 18 Protector and mount (equipment for tunnel widening work)
24, 42 Shoulder part of the protector and inclined part 28 of the frame 28 Side space 30, 34, 40 of the protector in the tunnel Projection, extension part and jack (fixing means)
36 Overhang portions 48, 56, and 58 of belt frame, its first belt conveyor portion and its second belt conveyor portion

Claims (7)

A protector having a top portion and both side portions that are arranged in an existing mountain tunnel to be widened and that defines a passage, and a shroud of the tunnel lining and its surroundings placed on the protector so as to be able to travel in the extending direction A facility for tunnel widening work, comprising a gantry on which a device used for excavating the ground is installed, and a fixing means for releasably fixing the gantry to the protector. The fixing means includes one or a plurality of protrusions provided on each side portion of the protector and extending in an extending direction thereof, an extension portion provided on the mount and extending so as to embrace the protrusion, the protrusion of the protector, and the mount The equipment according to claim 1, comprising a plurality of jacks extending in the vertical direction and disposed between the extending portions of the two and supported by one of the protrusion and the gantry. 3. The protector according to claim 2, wherein the protector has a shoulder extending obliquely downward from the top and each side thereof, and the extension of the pedestal includes an inclined portion extending along the shoulder of the protector. Facility. The facility according to claim 2, wherein the gantry includes an overhanging portion extending horizontally from each of the extending portions. The facility according to claim 1, comprising a belt conveyor supported by the gantry and extending along the gantry. The belt conveyor has a length dimension higher than the total height of the truck used to carry the shear generated by crushing the tunnel lining and excavating the surrounding ground and longer than the total length of the truck. The facility according to claim 5. 7. The installation of claim 6, wherein a portion of the belt conveyor is swingable relative to the remaining portion.

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