JPH094389A - Lining member for tunnel - Google Patents

Abstract

PURPOSE: To firmly fix the lining to the natural ground even in the soft ground and surely support the reaction force with the rear lining when a shield machine main body is advanced. CONSTITUTION: A bag body 8 is arranged on the back face of a segment 7, and the bag body 8 is made of a different-diameter tubular woven fabric having a large-diameter section at the control section and small-diameter sections at both end sections. The folded width of the small-diameter sections is made smaller than the diameter of the large-diameter section, both ends of the small- diameter sections are flatly folded and closed, and the flat small-diameter sections are folded to the side of the large-diameter section kept in contact with the segment 7 and stuck to the back face of the segment 7. An injection port 9 communicated with the bag body 8 through the segment 7 is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lining member on the inner surface of a tunnel when the tunnel is formed by a shield method or the like.

[0002]

2. Description of the Related Art Conventionally, a shield method is widely known as a method for forming a tunnel in the ground.

In the shield construction method, as shown in FIG. 1, the shield machine body 1 is pushed into the ground by a jack 2 for propulsion, and then a plurality of lining segments 3 are assembled inside the tail portion of the shield machine. It is common to fill the overfill space 4 between the lining segment 3 and the ground 5 with a backfill material such as concrete.

The lining segment 3 is, as shown in FIG.
A large number (6 in FIG. 2) of A-shaped 3a forming the bottom, both sides and near the ceiling of the tunnel, two B-shaped 3b forming both sides of the ceiling, and a C-shaped 3 forming the top of the ceiling.
c, which automatically assembles these lining segments 3 at the rear of the shield machine body 1 to form a generally cylindrical tunnel.

[0005]

However, in this method, when the ground is soft, the lining segment 3 is used.
Loosening is likely to occur in the ground before the backfill material is cured after assembling. The reaction force for propelling the shield machine body 1 is supported by the rear lining segment 3, but if the ground 5 around the lining segment 3 is loose, the shield machine body 1 It is difficult to support the reaction force of.

Further, a tubular bag is attached to the outside of the lining segment 3, and a backfill material is filled into the bag to inflate it to prevent the ground 5 from loosening and to fill the overditch space 4. A method is also possible.

However, generally, in the shield construction method, the work such as movement, assembly and installation of a plurality of lining segments 3 is automatically performed, so that during the automation process, along the outside of the lining segment 3. It is difficult to add the step of installing a ring-shaped bag.

On the outside of each lining segment 3,
It may be possible to incorporate it into the automation process by individually attaching the pre-divided bags, but the end of each bag does not become an obstacle to assemble the lining segment 3 and press-fits the backfill material. Adjacent bags are butted against each other while resisting the pressure when the lining segment 3 and the ground 5
It is necessary that the space between and is completely backfilled.

In particular, when a slow-hardening mortar or the like is used as the backfill material, in order to prevent loosening of the natural ground and to secure a reaction force for excavation before the mortar is hardened, the backfill material It is necessary to increase the pressure up to about 10 kg / cm ^2, and the bag body is required to have a high withstand pressure and a structure capable of withstanding a high pressure even at the terminal portion.

The present invention has been made in view of such circumstances, and a bag body is individually attached to the outside of the lining segment 3 to firmly fix the lining segment 3 to the ground 5. The purpose of the present invention is to provide a lining member that can be used.

[0011]

The tunnel lining member of the present invention comprises a bag body arranged on the back surface of a segment arranged along the inner surface of the excavated tunnel.
The bag body has a large-diameter portion in the central portion and is made of a tubular fabric of different diameters having small-diameter portions at both ends, and the folding width of the small-diameter portion is smaller than the diameter of the large-diameter portion. Both ends of the portion are flatly folded and closed, and the small diameter portion in the flat state is fixed to the back surface of the segment in a state of being folded back to the side in contact with the segment in the large diameter portion, the segment Is characterized in that an injection port that penetrates through and communicates with the bag body is formed.

The present invention will be described below with reference to the drawings. FIG.
Shows a lining member 6 of the present invention, and 7 is a segment.

Similar to the lining segment 3 shown in FIG. 2, the segment 7 is curved in a substantially arc shape so that a plurality of segments 7 are combined to form a tunnel lining having a substantially circular cross section. There is.

In this drawing, the segment 7 includes a substrate 7a forming a part of a substantially cylindrical surface, and a plurality of reinforcing plates 7b and 7c extending inward and outward of the curve of the substrate 7a along the curve direction. However, the segment 7 is not limited to the one having the structure shown in FIG. 3, and the segment generally used as the lining segment 3 can be used as it is.

Numeral 8 is a bag body attached between the reinforcing plates 7c of the segment 7 along the outside of the curve of the substrate 7a, and an injection port 9 penetrating the substrate 7a and communicating with the bag body 8 is formed. Has been formed.

FIG. 4 shows one end of the bag body 8 according to the present invention, and 10 is a tubular woven fabric. The tubular woven fabric 10 has a large diameter portion 11 at the center and small diameter portions 12 at both ends, and has a different diameter.

The large diameter portion 11 of the tubular fabric 10 is
The bag body 8 has a diameter larger than the maximum distance between the rear surface of the substrate 7a of the segment 7 and the ground 5, and the lining member 6 is assembled.
When the bag is inflated, the bag body 8 becomes the segment 7 and the ground 5
It should be possible to press.

The small-diameter portion 12 of the tubular woven fabric 10 has a folding width smaller than the diameter of the large-diameter portion 11 in a flat folded state, and the ends of the small-diameter portion 12 are flatly folded to form a pair. It is pinched by the pinching piece 13 and is closed.

The pressing piece 13 is an appropriate metal plate or the like, and the small diameter portion 12 can be pressed by pinching the end of the small diameter portion 12 in a flat state with this plate and tightening with a bolt or the like.

The small-diameter portion 12 is folded back toward the segment 7 at the boundary with the large-diameter portion 11, and in this state the small-diameter portion 12 is fixed to the back surface of the segment 7. The pinching piece 13 that closes the end of the small-diameter portion 12 is fitted into the groove 14 formed in the back surface of the segment 7.

The means for closing the end of the small-diameter portion 12 is not limited to the means for pressing with the pressing piece 13, but other means such as suturing can be used. Also, when the small diameter portion 12 in the flat state is fixed to the back surface of the segment 7, the small diameter portion 12 can be fixed with a bolt or a rivet or can be adhered.

[0022]

In the present invention, the bag body 8 is attached to the back surface of the segment 7 in a flatly folded state. When the segment 7 has a reinforcing plate 7c on the outer side of the curve as shown in FIG. 3, it is preferable to fold the bag body 8 smaller and store it so as not to project from the outer edge of the reinforcing plate 7c. .

Thus, in the shield construction method and the like, after the shield machine body 1 is advanced to advance excavation as shown in FIG. 1, a plurality of lining members 6 of the present invention are assembled and covered at the tail portion of the shield machine. Form the work.

At this time, since the lining member 6 has the bag body 8 attached to the outside of the segment 7, the lining member 6 can be handled in the same manner as the lining segment 3 in the conventional construction method, and the automatic lining member can be used. Can be incorporated into the assembly process.

After assembling the lining member 6, a backfill material such as mortar is press-fitted into the bag body 8 through the injection port 9. Due to the pressure of the backfill material, the bag body 8 swells, and as shown in FIG. 3, the bag body 8 is strongly pressed against the segment 7 and the natural ground 5 to fill the excess dug space 4 and to prevent water in the backfill material. It is discharged from the cloth of the bag body 8.

At this time, as shown in FIG. 4 (b), the bag 8
The large-diameter portion 11 expands so that the small-diameter portion 12 is sandwiched between the large-diameter portion 11 and the segment 7, and the pressing piece 1
Since 3 is locked in the groove 14 of the segment 7, the small diameter portion 1
2 is held in a state of being folded back from the pressing piece 13.

Therefore, when the bag body 8 is inflated, the end of the bag body 8 is inflated into a substantially hemispherical shape, as shown in FIG. Without doing so, as shown in FIG. 3, the ends of the bags 8 of the adjacent lining members 6 are butted against each other and pressed against each other.

Therefore, the ends of the bag body 8 are pressed against each other,
It is possible to reinforce each other to increase the pressure resistance of the bag body 8 and to seal the lining to prevent intrusion of groundwater from the ground 5 into the tunnel.

[0029]

Therefore, according to the present invention, the backfill material can be filled into the bag body 8 at a high pressure, and the bag body 8 is pressed against the segment 7 and the ground 5 to ground the lining member 6. Since it is fixed to the mountain 5, even if the ground 5 is soft, the backfill material does not enter into the soft rock to loosen the rock.

Therefore, even on soft ground, the lining can be firmly fixed to the ground 5, and the reaction force for propelling the shield machine body 1 is also mediated by the assembled lining member 6. It can be firmly supported by 5.

Further, since the small-diameter portion 12 of the bag body 8 is folded back so as to overlap the large-diameter portion 11, the end of the bag body 8 has a hemispherical shape when an internal pressure is applied, and can withstand a high pressure. At the same time, the ends of the adjacent lining members 6 are in pressure contact with each other, and the backfill material can be filled over the entire space between the segment 7 and the ground 5.

Since the pressing piece 13 that closes the end of the tubular fabric 10 is fitted in the groove 14 formed in the segment 7, the bag body 8 may be damaged by the pressing piece 13. In addition, it does not hinder the storage of the bag body 8. Further, since the pressing piece 13 is locked in the concave groove 14 and does not move, the hemispherical shape of the terminal does not change even if internal pressure is applied to the bag body 8, and high pressure resistance can be maintained.

Further, in the present invention, both ends of the bag body 8 are the small diameter portions 12, and the folding width thereof is smaller than the diameter of the large diameter portion 11, so that the shape of the end of the bag body 8 becomes smooth and the inner pressure locally causes the bag 8. It doesn't take a lot of force to
When the small diameter portion 12 is folded back, it does not stick out to the side of the large diameter portion 11, and the pressing piece 13 is also compact.

In the above description, the present invention has been described as a lining member in the shield construction method, but the present invention is not limited to the shield construction method, and other construction methods such as arch-type support work. Can also be applied to the formation of a tunnel using. In this case, the steel support member divided into a plurality of pieces is used as the segment 7 in the present invention, and the bag body 8 is arranged on the outer side thereof, whereby the lining member 6 of the present invention can be obtained.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing a state in which the shield construction method is carried out.

FIG. 2 is a conceptual diagram showing an assembled state of a lining segment in the shield construction method.

FIG. 3 is a central vertical sectional view of a lining member of the present invention.

FIG. 4 shows a terminal portion of the bag body of the present invention,
(A) is a side view which shows the terminal part of a tubular fabric, (b)
[Fig. 3] is a side view of a terminal portion of a bag body.

[Explanation of symbols]

 6 Lining member 7 Segment 8 Bag 9 Injection port 10 Cylindrical fabric 11 Large diameter part 12 Small diameter part

Claims (1)

[Claims] 1. A bag body (8) is arranged on a back surface of a segment (7) arranged along an inner surface of an excavated tunnel, the bag body (8) being arranged at a central portion. The tubular fabric (10) having a large diameter portion (11) and different diameters having small diameter portions (12) at both ends, and the folding width of the small diameter portion (12) is larger than that of the large diameter portion (11). The diameter is smaller than the diameter, and both ends of the small diameter portion (12) are flatly folded and closed, and the small diameter portion (12) in the flat state is in the segment (7) in the large diameter portion (11). It is fixed to the back surface of the segment (7) in a state of being folded back to the contact side, and an injection port (9) which penetrates the segment (7) and communicates with the inside of the bag body (8) is formed. And the lining member of the tunnel