JP2973833B2 - Jumbo for central advanced rear widening tunnel excavation - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jumbo for drilling a central advanced rearward widened tunnel having a function of performing a parallel excavation work of an advanced excavation portion at the center of a tunnel and a lateral widening excavation portion following the tunnel. Things.

[0002]

2. Description of the Related Art Conventionally, in a so-called mountain tunnel in which a tunnel is excavated and formed in a relatively stable ground made of rock or sandy soil from soft rock to hard rock, an open face is used for explosives. It is common to excavate by blasting work used, or by rock drilling and split rock work using various types of heavy equipment.

[0003] In such a mountain tunnel, especially when a tunnel having a large cross section is formed by excavation, it is necessary to perform excavation work while stabilizing the face face. A construction method is adopted in which a cross section is divided and excavation work is sequentially performed in a stepwise manner while keeping a part of the tunnel cross section and holding the face face or surrounding ground.

[0004] Such tunnel excavation methods include:
For example, a so-called bench cut method in which a cross section of a tunnel is divided into at least two sections in the horizontal direction, and excavation work is sequentially performed from the upper portion of the divided cross section, or a side portion of the tunnel is previously excavated. After that, a so-called silot method for excavating the remaining tunnel section and other various tunnel methods are known. In addition, the so-called central advanced rear widening tunnel excavation method, in which all or part of the tunnel cross section is vertically divided and the central part is excavated in advance and the widened part is excavated subsequently to the central part. Is also conceivable. According to the tunnel excavation method of the central advanced rearward widening type, the excavation work can be performed while efficiently protecting the ground at the side of the tunnel, so that the excavation is performed while stabilizing the ground at the side of the tunnel. It is effective as a construction method when work needs to be performed.

[0005] On the other hand, as a heavy machine for efficiently performing a blasting operation using explosives and a digging operation of a mountain tunnel by rock drilling and rock cutting work, a heavy digging machine called a jumbo is conventionally known.

[0006]

However, as an excavating machine suitable for the above-mentioned central advanced rearward widening tunnel excavation method, it is necessary to efficiently perform the excavation work of the central advanced part and the subsequent widened part following the central advanced part. At present, no jumbo for tunnel excavation has been developed.

[0007] Further, even in a mountain tunnel formed in a stable ground in which such a jumbo for tunnel excavation is adopted, a ground or a sandy ground having many cracks or slip surfaces, a soft rock having a low strength or an inflatable ground can be obtained. In some cases, the vehicle may pass through a mountain having a bad geological condition such as a mountain, and if a drilling operation is performed by using a tunnel excavation jumbo in such a ground, there is a fear that the surrounding ground may collapse or collapse.

In view of the above, the present invention has been made in view of the above-mentioned conventional problems, and the excavation work of the central advanced portion and the subsequent widened portion is translated by one tunnel excavating jumbo. It is an object of the present invention to provide a central advanced rearward widening tunnel excavation jumbo capable of efficiently performing a central advanced rearward widening tunnel excavation method.

Another object of the present invention is to provide a center advanced rearward widened tunnel excavation jumbo capable of easily excavating while stabilizing the ground around the tunnel.

[0010]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above-mentioned object, and its gist is to provide a front excavation portion which is arranged to face a face of an advanced portion at the center of a tunnel, and a front excavation portion which is provided. A rear excavation portion disposed opposite to the face of the widened portion on the side of the advanced portion, a jumbo gantry movable in the tunnel excavation direction, and provided at each end portion of the front excavation portion and the rear excavation portion. A central advanced rearward widening tunnel excavating jumbo characterized by comprising a plurality of drilling devices for drilling each of the facing face surfaces.

The center advanced rearward widening type tunnel excavating jumbo of the present invention includes a fore pile slide track extending along a shape of a tunnel top end surface in a cross direction of the tunnel around the jumbo mount. The fore pile is supported by the slide track and is disposed opposite to the top end of the face, and moves along the fore pile slide track to sequentially fore pile the ground in front of the tunnel along the top face of the tunnel. Is preferably provided.

Further, the center advanced rearward widening type tunnel excavating jumbo of the present invention comprises a blowing slide track extending along the shape of the top end surface of the tunnel in the cross direction of the tunnel above the jumbo mount, and It is preferable to include a spraying machine which is supported by the slide track for use and is disposed to face the tunnel top end face, and moves along the spraying slide track to spray the shotcrete along the tunnel top end face. .

[0013] Further, the center advanced rearward widening type tunnel excavating jumbo of the present invention is characterized in that a side pile driving device is disposed on the side of the rear excavating portion of the jumbo stand facing the ground on the side. It can also be provided.

[0014]

According to the central advanced rearward widening type tunnel excavating jumbo of the present invention, the jumbo gantry is provided with a front excavating portion opposed to the face of the advanced portion in the center of the tunnel, and the advanced portion behind the front excavating portion. Since it consists of a rear excavation part arranged opposite to the side face of the widened part, while moving the jumbo frame in the tunnel excavation direction, the drilling device provided at the tip of the front excavation part cuts the advanced part face By drilling the face of the widened section with a drilling device provided at the tip of the rear excavated section, it is possible to easily perform the excavation work of the central advanced section and the subsequent widened section following this. Can be.

[0015] A fore pile slide track extending along the shape of the tunnel top end surface in the cross direction of the tunnel around the upper side of the jumbo gantry, and a top end portion of the face face supported by the slide track. If a fore pile placing device is provided that is arranged to face and moves along the fore pile slide track to sequentially drive the fore pile into the ground ahead of the tunnel along the top end surface of the tunnel, a jumbo gantry is provided. While the fore pile driving device is sequentially moved on the fore pile slide track provided along the shape of the tunnel top surface around the top of the tunnel, the fore pile is moved by the driving device to a predetermined position along the top end of the tunnel. It can be easily driven into position. That is, the fore pile slide track is firmly supported and fixed in the vicinity of the top end of the face face, using the jumbo gantry as a scaffold, and the fore pile driving device forms a slide track along the top end face of the tunnel. While sequentially moving as a guide, a large number of forepiles can be accurately driven into predetermined positions along the top end face.

Here, the fore pile is formed by driving a large number of linear cores made of, for example, a steel member or a hardened body from the face of the tunnel toward the ground in front thereof along the top end surface of the tunnel. In a so-called fore-piling method in which excavation work is performed after receiving and protecting the excavated ground with a roof covering the excavated ground formed by such a large number of core materials, the core material is driven into the ground.

Further, in the jumbo for center advanced rearward widening type tunnel excavation of the present invention, a spraying slide track is provided around the upper side of the jumbo gantry, and a spraying machine for shotcrete is moved along the slide track. The rear end of the tunnel can be quickly protected by shotcrete.

Furthermore, if a side pile driving device is provided on the side of the rear excavation portion of the jumbo mount, the side pile driving device is disposed so as to face the ground on the side, and the ground on the side of the tunnel can be simultaneously formed. Excavation work can be performed with reinforcement.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings. For example, as shown in FIG. 1 as a rear view, the central advanced rearward widening type tunnel excavating jumbo 1 according to this embodiment excavates an upper half portion 60 of a tunnel 50 having a width of about 15 m. In a so-called upper half advanced construction method, the tunnel section of the upper half portion 60 is formed by a central advanced portion 51 and side widened portions 52 on both sides thereof.
By vertically dividing into three parts in the vertical direction and performing the preceding excavation work of the central advanced part 51 and the excavation work of the lateral widening part 52 following it in parallel, the so-called central advanced rear widening type tunnel excavation method is performed. Is adopted in order to carry out efficiently.

FIG. 2 is a side view, FIG. 3 is a plan view, and FIG. 4 is a sectional view taken along line AA, BB, and CC in FIG. As also shown in FIGS. 5 and 6, the front excavation portion 31 mainly serving as a protruding portion facing the face face 53 of the central advanced portion 51, and the face of the rear widening portion 52 behind the front excavation portion 31. A jumbo gantry 3 having a convex planar shape composed of a rear excavated portion 32 as a widened portion facing the surface 54 and a face face of a central advanced portion 51 provided at a front end portion of the front excavated portion 31. A plurality of drilling drifters 1 as drilling devices for drilling 53 holes
9 and a plurality of drilling drifters 19 ′ that are provided on the front end of the rear excavation part 32 in the tunnel axial direction, that is, on the front surface of the overhanging part 33 of the rear excavation part 32 and drill the face face 54 of the lateral widened part 52. It is constituted by and.

The jumbo gantry 3 has a frame structure formed by assembling and joining, for example, H-shaped steel and other steel materials.
In addition to being a support base for each operation by each device described later, the lower end of the main column 55 is provided with wheels 56, so that the rail 2 laid on the bottom of the upper half portion 60 of the tunnel, that is, on the upper surface of the lower half portion 70 of the tunnel. Travel along the tunnel axis along the axis.

The length of the front excavation portion 31 protruding from the rear excavation portion 32 is appropriately designed in consideration of the size of the tunnel cross section, the soil properties of the surrounding ground, stability, and the like. For jumbo 1, the protruding length is, for example, 10 m.
Therefore, the central advanced portion 51 of the tunnel 50 can be always excavated about 10 m ahead of the laterally widened portion 52.

On the other hand, the drilling drifters 19, 19 '
Has a drilling drill boom base 7 fixed to a frame member in front of the front end portion of the front excavation portion 31 or the overhang portion 33 of the rear excavation portion 32, and a bendable joint portion extending forward from this. Drifter boom 58
And the drifter body 59, and the drifter body 5
9 is disposed in front of the jumbo gantry 3 to
By driving from the control room 62, the face surfaces 53 and 54 are
A hole is formed at a predetermined position for loading a blasting explosive. The drilling drifters 19, 19 'can be replaced with a rock drill or the like, and thereby the face face can be directly excavated. That is, the drilling device in the present invention includes other excavating devices such as a rock drill.

The upper part of the jumbo stand 3 is covered by an arch-shaped protector 4 to ensure the safety of the work performed below and the safety of the device. The rear of the jumbo stand 3 is protected by the protector 4 at the rear, and the drive / control room 62 is protected.
The drive / control room 62 has a function as a counterweight, from which the drilling drifters 19, 19 ', the fore pile driving device 5, other devices and equipment are driven and controlled. However, this contributes to the stability of the apparatus during the drilling operation or the fore pile driving operation by the tunnel excavating jumbo 1. Further, a supporter handling device 21 is provided at the tip of the jumbo gantry 3 so that various supporter assembly operations can be performed.

The tunnel excavating jumbo 1 of this embodiment further includes a fore pile driving device 5 for driving a fore pile into the ground in front of the front excavating portion 31. That is, this tunnel excavating jumbo 1
Is a tunnel 50 around the upper part of the front excavation part 31.
The front and rear guide cells 13 and 14 as fore pile slide tracks extend in the transverse direction along the shape of the top end surface of the tunnel 50, and the fore pile driving device 5 includes the front and rear guide cells. The fore piles 6 can be driven into the ground in front while being slid along these while being supported by 13 and 14.

The fore pile driving apparatus 5 includes front and rear for pile pile drifter boom bases 66 and 67 supported on the front and rear guide cells 13 and 14 and slidably moved along the guide cells 13 and 14, respectively. Guide rod 18 supported by boom bases 66 and 67
And a fore-pile drifter 17 extending forward of the guide rod 18. That is, each of the front and rear drifter boom bases 66 and 67 is provided with a jack mechanism that can move up and down and can be easily and accurately positioned toward the top end of the tunnel face, and the guide rod 18, that is, the fore pile 6 The driving angle can be arbitrarily adjusted. And
Drifter boom tables 66 and 67 are guide cells 13 and 14
Along the arch-shaped tunnel top end surface, covering a large number of forepiles 6 in a roof shape over the tunnel excavation portion in front of the facet, and sequentially and orderly by the forepile drifter 17. It can be driven accurately.

The tunnel excavating jumbo 1 of this embodiment is provided with the front guide cell 1 in the front excavating section 31.
Further, a spraying guide cell 12 having an arch-like shape similar to the above is provided, and a spraying machine 15 disposed toward the top end surface immediately after excavation is sprayed while moving along the spraying guide cell 15 further forward of the blower. By spraying the concrete, the arched top end face after excavation can be protected quickly and easily.

In this embodiment, the case where the fore pile driving device 5 and the spraying machine 15 are provided in the front excavating portion 31 of the jumbo gantry 3 has been described.
2, a fore pile guide cell 70 and a spray guide cell 71 are provided in the transverse direction of the tunnel along the shape of the tunnel top end face (see FIG. 2). 5 and the spraying machine 15 are moved, so that the face face 54 of the side widened portion 52 is moved.
It is possible to easily perform the work of protecting the ground in front and the work of protecting the top end of the tunnel immediately after excavation (see reference numeral 6 'in FIG. 6). At this time, the fore pile driving device 5 used in the front excavation part 31 is slid in the tunnel axis direction and placed on the fore pile guide cell 70 of the rear excavation part 32, whereby the fore pile driving is performed. The setting device 5 can be diverted and used, and the same applies to the spraying machine 15.

Further, in the tunnel excavating jumbo 1 of this embodiment, the frame members located on both sides of the side excavating portion 32 of the jumbo stand 3 are provided with a side pile drifter boom base 9 (see FIG. 2). A side pile driving drifter boom 10 is provided (see FIG. 6), so that the side pile 8 for reinforcing the ground on the side of the tunnel 10 can be formed on the ground on the side of the tunnel 10. I can do it. Here, the side pile 8 is a linear core made of, for example, a steel member or a hardened body which is driven into the ground beside the tunnel 10 and includes so-called side piles, micro piles, foot piles and the like.

According to the jumbo tunnel excavation 1 of this embodiment having the above configuration, the front excavation part 3 is moved while the jumbo base 3 is slid along the rail 2.
1, the tunnel excavation work is performed while the center advanced portion 51 always precedes the side widened portions 52 on both sides of the central advanced portion 51 by about 10 m.
While holding down the ground on the sides to stabilize this,
The excavation work of the central advanced portion 51 and the lateral widened portion 52 can be performed while moving in parallel.

Further, by providing the fore pile driving device 5, the shotcrete spraying machine 15, or the side pile driving drifter boom 10, even if the vehicle passes through a ground with bad geological conditions, the surroundings of the tunnel can be improved. Excavation work can be easily performed while stabilizing the ground in the area, and the tunnel excavation work can be efficiently performed while avoiding the congestion of heavy equipment by using other heavy equipment for these works. Can be.

In the above embodiment, the case where the center advanced rearward widening type tunnel excavation jumbo of the present invention is used in the upper half advanced construction method has been described. However, the tunnel excavation jumbo of the present invention is limited to this embodiment. However, if it is a construction method of excavating the tunnel by dividing the tunnel in the vertical direction, it can be applied to other tunnel construction methods such as a case of excavating the entire cross section of the tunnel at the same time.

[0033]

As described above in detail, according to the central advanced rearward widening type tunnel excavating jumbo of the present invention,
The jumbo gantry comprises a front excavation portion disposed opposite to the advanced face in the center of the tunnel, and a rear excavation portion disposed behind the front excavation portion and opposed to the widened portion face on the side of the advanced portion, While moving the jumbo gantry in the tunnel excavation direction, the advanced face face is drilled by the drilling device provided at the tip of the front excavation part, and the widening face is cut by the drilling device provided at the tip of the rear excavation part. By drilling each, the excavation work of the tunnel is performed while always keeping the central advanced part ahead, and the left side widening part holds down the side ground and stabilizes this, while Subsequent excavation work of the laterally widened portion can be easily performed in parallel.

Also, by providing a function of driving a fore pile into the ground in front of the face, a function of blowing concrete to the top end of the tunnel, or a function of driving a side pile into the ground on the side, Even when the tunnel passes through a ground with poor geological conditions, excavation work can be easily performed while stabilizing the ground around the tunnel.

[Brief description of the drawings]

FIG. 1 is a schematic rear view of a central advanced rearward widening type tunnel excavation jumbo according to an embodiment of the present invention as viewed from the rear side.

FIG. 2 is a schematic side view of a jumbo for excavating a center advanced rearward widening tunnel according to an embodiment of the present invention.

FIG. 3 is a schematic plan view of a center advanced rear widening type tunnel excavating jumbo according to an embodiment of the present invention.

FIG. 4 is a schematic sectional view taken along AA of FIG. 2;

FIG. 5 is a schematic sectional view taken along line BB of FIG. 2;

FIG. 6 is a schematic sectional view taken along the line CC of FIG. 2;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Jumbo for tunnel excavation 2 Rail 3 Jumbo stand 5 Fore pile setting device 6, 6 'Fore pile 8 Side pile 10 Drifter boom for side pile 12 Spray guide cell (slide track for spray) 13, 14 Fore pile guide Cell (slide track for forpile) 15 Sprayer 17 Drifter for forpile 19, 19 'Drifter for drilling (drilling device) 31 Forward excavation part 32 Rear excavation part 50 Tunnel 51 Central advanced part 52 Side widening part 53 Cutting edge surface (central advanced part) 54 Cutting edge surface (side widening part)

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kenta Matsubara 2-3-3 Kandaji-cho, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo Head Office (56) References JP-A-6-257376 (JP, A) JP-A-Hei 5-33589 (JP, A) JP-A-6-280476 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) E21D 9/00 E21D 9/04

Claims (4)

(57) [Claims] 1. A front excavation portion disposed opposite to an advanced portion face in the center of a tunnel, and a rear excavation portion disposed behind the front excavation portion and opposed to the widened portion face on the side of the advanced portion. It is characterized by comprising a jumbo gantry movable in the tunnel excavation direction, and a plurality of drilling devices provided at each of the front end portions of the front excavation portion and the rear excavation portion, and performing drilling of the facing face surfaces. Jumbo for excavating the central advanced rear widening tunnel. 2. In the upper periphery of the jumbo gantry,
A fore-pile slide track extending in the tunnel transverse direction along the shape of the tunnel top end face; and a fore-pile slide track supported by the slide track and disposed opposite to the top end portion of the face face. The center advanced rear widening type according to claim 1, further comprising a fore pile driving device that sequentially moves the fore pile into the ground in front of the tunnel along the top end surface by moving along the top of the tunnel. Jumbo for tunnel excavation. 3. In the upper periphery of the jumbo gantry,
A spraying slide track extending in the transverse direction of the tunnel along the shape of the tunnel top end face, and is arranged to face the tunnel top end face supported by the spraying slide track and move along the spraying slide track. 2. The spraying machine according to claim 1, further comprising a spraying machine for spraying the sprayed concrete along the top surface of the tunnel.
Or, the jumbo for excavating a center advanced rearward widening tunnel according to claim 2. 4. The device according to claim 2, further comprising a side pile driving device disposed on a side of the rear excavation portion of the jumbo gantry so as to face the ground on the side. 3. The jumbo for drilling a central advanced rear widening tunnel according to item 3.