JP2833482B2 - Steel lining structure of tunnel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel lining structure for a tunnel for performing lining with a steel plate.

[0002]

2. Description of the Related Art In the case of excavating a tunnel having a large cross section, conventionally, in general, a drilling machine such as a multiple jumbo drilling machine is used to drill a face face and set up a charge, or excavate the rock using a rock drill. Then, after removing the generated waste, a method is employed in which the top end of the face is covered with shotcrete or the like, and the work of placing a lock bolt is repeated.

[0003]

However, in the case of lining work using sprayed concrete, dust is likely to be generated during lining work. Especially in the case of large section tunnels, the construction area is extremely large, so the amount of dust generated increases, and the work time required for excavation is also long, which causes the work environment to deteriorate and it is improved. Was desired.

Therefore, the present invention has been made in view of the above problems, and has been made in consideration of the above-mentioned problem. It is intended to provide a lining structure.

Another object of the present invention is to make it possible to firmly and surely support the foot of a shoring for supporting a steel plate, and to use the steel plate as a disposal mold for backfill injection. It is.

[0006]

SUMMARY OF THE INVENTION The steel lining structure of a tunnel according to the present invention has been made in order to achieve the above object, and is constructed along the cross-sectional shape of an excavated tunnel. And a plurality of crown bars supported on an existing support while temporarily receiving the lower surface of the steel plate, and a number of lock bolts which are driven into the ground through the temporarily received steel plate. And a supporter that is assembled to the distal ends of the steel plate and the crown bar and supports these distal ends.

Further, the steel lining structure of the tunnel according to the present invention has a pair of advanced shafts excavated on both sides of the tunnel, and a silott concrete cast in the advanced shaft, It is preferable to support the support leg at the top end of the lot concrete (claim 2).

Further, a structure in which a backing material is filled between the steel sheet and the ground can be adopted.

[0009]

In the steel lining structure for a tunnel according to the present invention having the above-described structure, after the steel plate is installed, the steel plate is temporarily fixed to the top end face of the face by mounting the crown bar. Therefore, the work of driving the lock bolt becomes easy thereafter, and the steel plate is firmly fixed to the top face of the face by such a lock bolt. In addition, since it is supported in a sandwiched state with the existing support, the ground can be effectively supported.

[0010] Further, in the case where the legs of the shoring are supported by the silott concrete poured into a pair of advanced shafts excavated on both sides of the tunnel, the foot of the shoring is firm and secure. Supported by

Further, in the case of employing a structure in which a backing material is filled between the steel sheet and the ground, the built-in steel sheet can be used as a disposal form for the backing material, and the tunnel can be made stronger. Lining can be performed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the steel lining structure of a tunnel according to the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a situation in which a steel lining structure 30 according to an embodiment of the present invention is employed in a tunnel 1. FIG.
Is a cross-sectional view of the tunnel 1, and FIG. 2 is a side view thereof.

In FIG. 1 and FIG. 2, a steel lining structure 30 is erected along the outer periphery of the excavated tunnel 1, that is, along the cross-sectional shape, and a steel plate 16 having a thickness of about 4.5 mm covering the top end face of the face. A plurality of crown bars 14 temporarily supported on the lower surface of the steel plate 16 and supported by the arch-shaped existing support 12 ′, and a number of crown bars 14 are radially driven into the ground E through the temporarily received steel plate 16. Lock bolt 1
8 and an arch-shaped support 12 that is assembled to the ends of the steel plate 16 and the crown bar 14 and supports the front end of the front end with respect to the excavation direction of the tunnel 1, that is, the tunnel 1. Prior to the excavation, a pair of lateral advanced shafts 2 are excavated on both sides of the tunnel 1 by the TBM method.

The tunnel 1 has an elliptical cross-sectional shape in the ground E having a relatively good ground such as a medium hard rock or a hard rock, and excavates with the upper half 1a preceding the lower half 1b. This is a large-section tunnel having a width of 20 m and a cross-sectional area of 230 m ² , for example, constructed by a so-called bench cut method.

The advanced shaft 2 has, for example, a circular cross section and is used for confirming the geology ahead, countermeasures for spring water, advance measures for a bad mountain section, etc. Concrete 2a is cast, and on the base concrete 2a, near the excavation position, the opposite wellhead is used as an entrance / exit end so as to form a part of the side surface of the tunnel 1 so as to form a continuous curved surface. The silt concrete 10 is cast in the pit, and almost half of the advanced shaft 2 is thereby backfilled.

The arch-shaped support 12 and the existing support 12 'are made of, for example, H-section steel, both ends of which are supported by silotte concrete 10.
In the tunnel 1, the shoring 12, which is disposed before and after,
Between 12 ', the crown bar 14 and the steel plate 16 are fixedly arranged in a sandwiched state.

The crown bar 14 and the steel plate 16
Has a length equal to the span in which the shoring 12 is erected, and connects the crown bar 14 to the shoring 12,
The steel plate 16 is temporarily fixed to the top face of the face by being attached between the twelve. The lock bolt 18 is made of, for example, steel or FRP having a length of about 4 m, and the steel plate 16 is firmly fixed to the top face of the face by driving the lock bolt 18.

The gantry jumbo 3 has a frame-shaped body 4 framed in a substantially convex cross section corresponding to the arch shape of the upper half of the tunnel 1, and an upper half of the body 4 on the lower surface of the body 4. In addition to a plurality of wheels 6 traveling along the rails 5 laid on the surface, a large number of drill jumbo (drilling machines) 7 protrudingly arranged at the end of the body 4 in multiple stages and multiple units, and a drive device therefor Inside the fuselage 4, a hydraulic unit (not shown), power supply equipment, a backfill injection device, and the like are arranged. A guide 8 having a shape along the upper arch shape of the tunnel 1 is provided at an upper portion of the fuselage 4, and a steel plate for lining, a shoring, and a crown bar described later are moved along the guide 8. Further, a push-up device 9 for assembling at a predetermined position is arranged.

The steel lining structure 30 having the above-described configuration can be automatically constructed by the gantry jumbo 3.

That is, in a state in which the gantry jumbo 3 is stopped facing the face, the drill jumbo 7 at the standby position is advanced to cut holes in the face with a predetermined depth and pattern, and then charge. And each drill jumbo 7
Is retracted to the standby position, and the face face is crushed to excavate the upper half 1a. The crushing of the face face can also be performed by a method of breaking the face face by inserting a wedge-shaped rock cutter into a drilled hole excavated to a predetermined depth without using blasting.

After the excavation work is completed, the gantry jumbo 3 is advanced again, and by using the push-up device 9, as shown in an enlarged view in FIG.
A steel plate 16 is positioned on the front side of 2 ', and the steel bar 16 is sequentially erected along the arch shape at the top end of the face, and each crown bar 14 is arranged at the lower portion thereof. And is temporarily received by each crown bar 14.

Next, the steel plate 16 is firmly fixed to the top end face by immediately driving a number of lock bolts 18 radially through the steel plate 16 toward the ground.

After the work of fixing the steel plate 16 is completed, the support 12 is assembled at the forefront of the cutting face, that is, at the front of the tunnel 1 in the digging direction (the direction of the arrow X in FIG. 3). At this time, the leg portions of the shoring 12 are supported on the top end of the silo concrete 10, and the arched structure is sequentially assembled on the basis of this portion. After the assembling operation is completed, the front end of the crown bar 14 is fixed to the rear end of the support 12 by welding or the like, so that the front and rear supports 12 and 1 are fixed.
A structure in which a steel plate 16 is sandwiched between 2 'and a lower portion thereof is supported by a plurality of crown bars 14 is provided.

In this embodiment, after the steel plate 16 has been fixed, the backing material 20 is injected into the gap between the steel sheet 16 and the ground, thereby filling the gap in the extra dug portion. However, it is not necessary to inject backing material, and if the properties of the ground are good,
Needless to say, the lining may be completed only with the steel plate 16, and the presence or absence of the pouring operation may be selected according to the properties of the ground.

According to the steel lining structure 30 having such a structure, the steel plate 16 is temporarily fixed to the top end face of the face by mounting the crown bar 14, thereby facilitating the subsequent driving operation of the lock bolt 18. be able to. Further, since the steel plate 16 is fixed by the lock bolt 18 and is supported in a sandwiched state between the support 12 and the existing support 12 ′, the ground E can be effectively supported. At the same time, dust is not generated by the conventional shotcrete, and the working environment can be maintained well.

Further, in this embodiment, since various types of assembling machines mounted on the gantry jumbo 3 are used to assemble mechanically, work can be performed safely and quickly.

Further, in this embodiment, a pair of advanced shafts 2 and 2 are excavated on both sides of the tunnel 1, and each of the advanced shafts 2 and 2 is excavated.
Since the sillot concretes 10 and 10 are cast therein, and the legs of the shoring 12 are supported at their top ends, the feet of the shoring 12 can be firmly and reliably supported. Further, since the backing material 20 is filled between the steel plate 16 and the ground E, the tunnel 1 can be reinforced more firmly, and the built-in steel plate 16 can be used as a disposal mold for the backing material 20. Since it can be used as a frame, the filling operation of the backing material 20 can be performed easily and quickly.

[0028]

As described above in detail, in the steel lining structure of the tunnel according to the present invention, the steel plate is easily and firmly fixed to the top end face of the face by driving a lock bolt. Furthermore, since it is supported in a sandwiched state between the supports, there is no dust generated by the conventional shotcrete and the working environment can be maintained well, making the tunnel lining work easy, There is an advantage that it can be performed safely and quickly.

Further, when the configuration of claim 2 is employed, there is an advantage that the foot of the supporter is firmly and reliably supported. Further, in the case of the configuration of claim 3, the built-in steel plate can be used as a disposal mold, and the gap between the steel plate and the ground is filled by injecting the backing material, so that a strong lining can be performed. Therefore, there is an advantage that versatility can be provided to the construction method according to the ground properties.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a steel lining method for a tunnel according to the present invention.

FIG. 2 is a side sectional view of FIG.

FIG. 3 is an enlarged view of a portion A in FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tunnel 12 Shoring 14 Crown bar 16 Steel plate 18 Lock bolt 20 Backing material

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E21D 11/15 E21D 11/00 E21D 11/18

Claims (3)

(57) [Claims] 1. A steel plate erected along a cross-sectional shape of an excavated tunnel and covering a top face of a face, and a plurality of crown bars temporarily receiving a lower surface of the steel plate and supported by an existing supporter. A plurality of lock bolts that are pierced into the ground through the temporarily received steel plate, and a supporter that is assembled to the distal ends of the steel plate and the crown bar and supports these distal ends. Characterized by the steel lining structure of the tunnel. 2. A tunnel having a pair of advanced shafts excavated on both sides of the tunnel, and a silott concrete cast in the advanced shaft, wherein the shoring works at the top end of the sillot concrete. The steel lining structure of a tunnel according to claim 1, wherein the leg portion is supported. 3. The steel lining structure of a tunnel according to claim 1, wherein a backing material is filled between the steel plate and the ground.