JPH0768857B2 - Shield machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield machine used for a shield construction method, a propulsion construction method and the like.

[0002]

2. Description of the Related Art FIG. 7 is a cross-sectional view of a shield cylinder on the rear end side of a conventional shield machine, taken in a direction orthogonal to the axial direction. In this type of shield machine 1, the excavation tool (not shown in FIG. 7) attached to the front end of the shield tube 2 is used to excavate the natural ground, and the propulsion jack installed in the shield tube 2 (this is shown in FIG. 7). Is also omitted), the reaction force is applied to the segment 15 assembled at the rear to propel the shield cylinder 2,
After propelling the shield tube 2, the segment 15 is assembled and lined behind it.

Thus, the shield cylinder 2 at the rear end of the shield machine
A clearance 21 is provided between b and the segment 15. The clearance 21 is provided in order to avoid a problem in which the segment 15 and the shield tube 2b at the rear end of the shield machine are in contact with each other and the segment 15 cannot be assembled due to an error in construction during excavation.

By the way, usually, the thickness of the tail skin plate 2c of the shield cylinder 2b at the rear end of the shield machine is designed on the assumption that the girder portion has sufficient rigidity, and the soil load is applied vertically and horizontally. The plate thickness is determined in consideration of the cross-sectional force and the amount of displacement generated by applying water pressure and its own weight.

In the horizontally long tail skin plate 2c as shown in FIG. 7, since the upper and lower members have long spans, the amount of displacement at the central portion becomes large. In this case, the plate thickness should not be a value obtained from the generated cross-sectional force, but should be a plate thickness that can accommodate the displacement within an allowable range.

Therefore, the thickness of the tail skin plate 2c of the shield machine having the shape as shown in FIG. 7 is determined from the amount of displacement, so that it becomes larger than necessary.

[0007]

As described above, when the thickness of the tail skin plate 2c at the rear end of the shield machine becomes large, the gap between the ground and the segment 15 (hereinafter referred to as "tail void") also becomes large. Become. Therefore, the back-filling injection amount increases and the influence on the ground surface is large.

The present invention has been made in view of the above circumstances. An object of the present invention is to reduce the amount of displacement of the tail skin plate of the shield cylinder at the rear end of the shield machine and to reduce the thickness of the tail void to reduce the tail void. It is intended to provide a shield machine that can reduce the size.

[0009]

To achieve the above object, according to an aspect of the present invention, the inner wall surface of the shield tube of the shield machine rear portion, provided with a reinforcing member to the tail plate and integral, reinforcing
The front end of the member is fixed to the girder part of the shield tube.
is there.

[0010] In addition, the present invention is put back to the inside of the reinforcing member
It is one that has been inserted through an injection tube.

Further, according to the present invention, a tail seal is attached to the rear end side of the reinforcing member.

[0012]

In the present invention, since the reinforcing member is integrally provided on the inner wall surface of the shield cylinder at the rear end of the shield machine, the amount of displacement of the tail skin plate of the shield cylinder at the rear end of the shield machine is reduced, and The plate thickness can be reduced. As a result, the tail void can be made small, so that the backfill injection amount can be made small and the influence on the ground surface can be made small.

Further, in the present invention, since the reinforcing member is formed in a hollow shape and the front end portion of the reinforcing member is connected to the girder portion of the shield cylinder, the present invention also uses the shield cylinder at the rear end portion of the shield machine. It is possible to reduce the displacement amount of the tail skin plate, reduce the plate thickness, and reduce the tail void. Moreover, the backfill injection pipe is inserted into the inside of the reinforcing member, and through this backfill injection pipe, at the same time as excavation by the shield machine, backfill injection is performed into the tail void between the ground and the segment, and the subsidence of the ground is performed. Can be suppressed.

Further, in the present invention, since the tail seal is attached to the rear end side of the reinforcing member, it is possible to prevent the inflow of earth and sand or groundwater into the shield cylinder from the ground.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show an embodiment of the present invention, and FIG. 1 is a cross-sectional view of a shield cylinder at a rear end portion of a shield machine, which is a main part of this embodiment, taken in a direction orthogonal to an axial direction, 2 and 3 are vertical side views taken along the lines AA and BB of FIG.

The embodiments shown in these figures show an earth pressure type shield machine. The shield machine 1 includes a shield tube 2 and
Excavator 5 having a partition wall 3 provided on the front end portion 2a side of the shield tube 2, a face chamber 4 and a plurality of cutting blades 6 arranged therein.
And a parallel crank motion mechanism of the excavator 5 and a soil discharging device 12 such as a screw conveyor having a drive motor 13.
And the propulsion jack 14 installed inside the shield tube 2.
It has and.

The shield tube 2 is formed of a steel plate into a rectangular tube shape, and as shown in FIGS. 2 and 3, a girder portion 16 is fixed to the inside substantially at the center in the axial direction.

A plurality of the parallel crank movement mechanisms are attached to one excavator 5. As shown in FIGS. 2 and 3, each parallel crank motion mechanism includes a drive motor 7, a drive shaft 8 connected to the drive motor 7 and supported by a bearing 9 provided on the partition wall 3, and the drive shaft. And a rotating body 10 attached to the front end of
And a support shaft 11 which is attached to the eccentric position and is connected to the disk of the excavator 5. The parallel crank movement mechanism is rotationally driven in the same direction and synchronously to rotate the excavator 5 in a parallel link manner.

In the earth pressure type shield machine 1, the parallel crank motion mechanism is driven to rotate the excavator 5 in a parallel link manner. As a result, in this embodiment, the ground is excavated into a horizontally long rectangle. The earth and sand after the excavation is taken into the face chamber 4, and then the propulsion jack 14 is placed behind the segment 1
As the shield tube 2 is propelled by applying a reaction force to 5, the earth and sand is taken into the earth discharging device 12 and discharged to the outside.

The shield cylinder 2 is provided by the propulsion jack 14.
After propelling, the segment 15 is assembled behind it by using, for example, an erector (not shown) to construct a horizontally long rectangular tunnel.

By the way, in this embodiment of the present invention, the reinforcing member 1 is provided on the inner wall surface of the rear end portion 2b of the shield tube 2.
7 are integrally provided. This reinforcing member 17 is shown in FIG.
As shown in FIG. 3, the shield cylinder 2 is provided at the center portion in the width direction of the upper member and the lower member. Further, as shown in FIG. 1, the reinforcing member 17 is formed in a shape that protrudes in a mountain shape toward the upper and lower central portions, and is formed in a hollow shape. Further, as shown in FIG. 3, the reinforcing member 17 has a front end portion integrally connected to a girder portion 16 fixed inside the shield tube 2. As can be seen from FIGS. 1 to 3, a backfill injection pipe 18 extending from the front end side of the girder portion 16 toward the rear end portion 2b of the shield tube 2 is inserted and fixed in the reinforcing member 17. Has been done. A tail seal 20 is attached to the rear end of the reinforcing member 17, as shown in FIG. The tail seal 20 is formed of a wire brush or the like.

As shown in FIG. 1, the branch segments 15a located above and below the central portion in the width direction of the segment 15 assembled at the rear of the shield tube 2 are arranged between the reinforcing members 17 located above and below. And clearance 2
1 is formed in a matching shape. A clearance 21 is also provided between the outer circumference of the assembled segment 15 and the outer circumference of the rear end portion 2b of the shield tube 2. As described above, these clearances 21 are, for example, for absorbing construction errors at the time of excavation and for avoiding the inability to assemble the segment 15 due to the interference between the rear end portion 2b of the shield tube 2 and the segment 15. is there. Further, in FIG. 1, reference numeral 15b indicates an intermediate segment between the upper and lower branch segments 15a, 15a.

As described above, the rear end portion 2b of the shield tube 2
In the shield machine 1 of this embodiment in which the reinforcing member 17 is integrally provided on the inner wall surface of the, and the front end portion of the reinforcing member 17 is coupled to the girder portion 16, the displacement amount of the tail skin plate 2c of the shield cylinder 2 in use is Can be reduced, and in connection with this, the plate thickness can be reduced. As a result, the tail void can be made small, so that the backfill injection amount can be made small and the influence on the ground surface can be made small.

Further, in this embodiment, since the reinforcing member 17 is formed in a hollow shape, and the back-filling injection pipe 18 is inserted into the hollow member, the back-filling injection pipe 18 is used to excavate the shield machine 1. At the same time, the backfill injection material 19 is supplied from the inner side of the shield tube 2 to the tail void between the ground and the segment 15 to perform backfill injection, and the subsidence of the ground can be quickly suppressed.

Further, in this embodiment, the reinforcing member 17 is used.
Since the tail seal 20 is attached to the rear end portion side, it is possible to prevent the inflow of earth and sand and groundwater into the shield tube 2 from the ground.

Next, FIGS. 4 to 6 are enlarged sectional views showing reinforcing members having different sectional shapes. The reinforcing member 22 of the embodiment shown in FIG. 4 is formed in a rectangular shape having a vertically long cross section, and is formed solid. Therefore, the branch segment 23 at the position corresponding to the reinforcing member 22 is also formed in a shape that matches the reinforcing member 22 with the clearance 21.

Next, the reinforcing member 24 of the embodiment shown in FIG.
Has a trapezoidal cross section and is solid.
The branch segment 25 at a position corresponding to the reinforcing member 24 is also provided with the clearance 21 and the reinforcing member 2 is provided.
4 is formed in a shape matching with No. 4.

Further, the reinforcing member 26 of the embodiment shown in FIG.
Has a triangular cross section and is solid. Thus, the branch segment 27 at a position corresponding to the reinforcing member 26 is also formed in a shape that aligns with the reinforcing member 26 with a clearance 21.

In the embodiments shown in FIGS. 4, 5 and 6, since the reinforcing members 22, 24, 26 are formed in a solid shape, the back-filling injection pipe is provided outside the reinforcing member. Has the same structure and operation as the embodiment shown in FIGS.

In the embodiments shown in FIGS. 4 to 6, the reinforcing member may be formed in a hollow shape, and the back-filling injection pipe may be inserted therein.

Further, in the present invention, the reinforcing member is not limited to being provided on the upper and lower members on the rear end portion 2b side of the shield tube 2,
It may be provided on the upper and lower members and the left and right members.

Furthermore, the present invention can be applied not only to earth pressure type shield machines but also to muddy water type and machine digging type shield machines.

[0033]

As described above, according to the first aspect of the present invention.
In the invention described, since the reinforcing member is integrally provided on the inner wall surface of the shield cylinder at the rear end of the shield machine, the displacement amount of the tail skin plate of the shield cylinder at the rear end of the shield machine is reduced, and the plate thickness is reduced. As a result, the tail voids can be made small, so that there is an effect that the backfilling injection amount can be made small and an effect on the ground surface can be made small.

Further, in the present invention, since the reinforcing member is formed in a hollow shape and the front end portion of the reinforcing member is connected to the girder portion of the shield cylinder, the present invention also uses the shield cylinder at the rear end portion of the shield machine. The amount of displacement of the tail skin plate is reduced, and the plate thickness is thinned, and in addition to having the effect of making the tail void small, a backfill injection pipe is inserted inside the reinforcing member, and through this backfill injection pipe, Simultaneous with the excavation by the shield machine, backfilling is injected into the tail void between the ground and the segment, which has the effect of promptly suppressing the settlement of the ground.

Further, in the present invention, since the tail seal is attached to the rear end side of the reinforcing member, it is possible to prevent the inflow of earth and sand and groundwater from the ground into the shield cylinder.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention and is a cross-sectional view of a rear end portion of a shield tube cut in a direction orthogonal to an axial direction.

FIG. 2 is a vertical sectional side view taken along the line AA of FIG.

FIG. 3 is a vertical sectional side view taken along the line BB of FIG.

FIG. 4 is a partially enlarged cross-sectional view showing another embodiment of the present invention.

FIG. 5 is a partially enlarged cross-sectional view showing another embodiment of the present invention.

FIG. 6 is a partially enlarged sectional view showing still another embodiment of the present invention.

FIG. 7 shows a conventional technique and is a cross-sectional view of a shield cylinder cut in a direction orthogonal to an axial direction.

[Explanation of symbols]

 1 Shield Machine 2 Shield Tube 2b Shield Machine Rear End Shield Tube Rear End 2c Tail Skin Plate 5 Excavator 12 Excavator 14 Propulsion Jack 15 Segment 15a Branch Segment 16 Girder Part 17 Reinforcement Member 18 Backfill Injection Pipe 20 Tail seal 22 Reinforcement member 23 Branch segment 24 Reinforcement member 25 Branch segment 26 Reinforcement member 27 Branch segment

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yukihiro Kitamura 1-24-4 Shinkawa, Chuo-ku, Tokyo Within Daitoyo Kensetsu Co., Ltd. (56) Reference JP-A-63-11795 (JP, A)

Claims (3)

[Claims] 1. A hollow or solid cross-sectional shape is formed on the inner wall surface of the shield cylinder at the rear end of the shield machine in the shield axial direction.
It provided a reinforcing member of the rod-like tail plate integrally, the complement
The front end of the strong member is fixed to the girder of the shield tube.
Shield machine and said. 2. A backfill injection pipe is inserted inside the reinforcing member.
The shield machine according to claim 1, wherein the shield machine is passed through . 3. The shield machine according to claim 1, wherein a tail seal is attached to the rear end side of the reinforcing member.