JP3588652B2 - Tail seal of shield machine - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a lining assembled inside a rear end of a skin plate in a shield machine and a tail seal of the shield machine for sealing a gap between the skin plate and the lining.
[0002]
[Prior art]
Generally, in the shield construction method, a plurality of segments are assembled in a ring shape on the inner surface of the tail portion of the shield machine to extend the lining, and the shield machine is extruded while extruding the shield machine with a reaction force. Since the outer diameter of the lining assembled in the shield machine is smaller than the inner diameter of the skin plate of the shield machine, a gap (hereinafter, referred to as a tail clearance) according to the construction condition is generated.
[0003]
Therefore, in the tail portion of the shield machine, as shown in FIGS. 4 and 5, the skin plate of the shield machine 1 is used to prevent groundwater, backfill material, and the like from entering the shield machine from the tail clearance. A tail seal 4 that is in sliding contact with the outer peripheral surface of the lining 3 is provided on the inner surface of the tail portion 2. The lining 3 is formed by assembling a plurality of segments 5 into a ring shape. The tail seal 4 is generally formed by installing ring-shaped wire brushes 6 continuously arranged in a circumferential direction in two to three stages, and groundwater, backfill material, and the like are formed on the skin plate 2 and the lining 3. Between the tail excavator 1 and the shield excavator 1 from the tail clearance 7.
[0004]
As shown in FIG. 5, a protection spring 8 is provided on the front side in the traveling direction of each wire brush 6, and a space between adjacent wire brushes 6, 6 is filled with a tail seal grease 9. In the figure, reference numeral 10 denotes a shield jack for advancing the shield machine by taking a reaction force on the front end face of the lining 3.
[0005]
In tunnel construction using such a shield excavator 1, at the time of curving in the vertical and horizontal directions, the excavation direction control of the shield excavator 1 as shown in FIG. An angle θ is formed between the lining 3 and the center line direction X2 of the lining 3 assembled therein, and the rear end of the lining 3 is biased in the circumferential direction in the tail clearance 7. Is absorbed by the elasticity of the tail seal 4, and the curve construction can be performed within the allowable absorption range.
[0006]
[Problems to be solved by the invention]
However, in the conventional shield machine 1 as described above, curve construction is possible within the allowable absorption range due to the elasticity of the tail seal 4, but the tail seal grease 9 leaks during the construction. The backfill material is often clogged between the wire brushes 6 and the allowable absorption range of the tail seal 4 is often smaller than at the beginning. If the continuation is continued, the required propulsive power of the shield machine 1 will be increased, the lining 3 and the tail seal 4 will be damaged, and as a result, backfill material, earth and sand, and groundwater will flow into the shield machine 1 and the tail seal grease will be generated. 9 arises.
[0007]
Even if the tail seal 4 is replaced, it is necessary to construct the intermediate shaft separately and perform the replacement work in the middle shaft or to perform the ground improvement, and it takes a lot of time and cost. In terms of safety, it is not safe work.
[0008]
In the future, if further long-distance construction, that is, construction in which the length between the shafts is lengthened and excavation of a long distance is performed with the same shield excavator 1 or construction of a sharp curve with a small radius of curvature is required, the tail seal 4 is required. Breakage, wear and replacement are of particular concern.
[0009]
Further, in the construction under the condition of large depth and high water pressure, the wire brushes 6 are arranged in a triple arrangement, but in this case, the length of the tail seal 4 becomes longer, and as a result, the length of the shield excavator 1 becomes longer. , The allowable value of the angle θ in the direction of the center line between the shield machine 1 and the lining 3 becomes small, and there is a problem in that the curve construction is hindered.
[0010]
An object of the present invention is to provide a shield seal machine tail seal capable of shortening the shield machine length of a rigid portion as compared with the related art.
[0011]
Another object of the present invention is to provide a tail seal for a shield machine that can reduce the problem of a competition between a skin plate and a lining.
[0012]
Another object of the present invention is to provide a tail seal for a semi-permanent shield excavator which can make good contact between a ring-shaped tail packing and a lining and can prevent abrasion of the ring-shaped tail packing. It is in.
[0013]
[Means for Solving the Problems]
The feature of the present invention for solving the conventional problems as described above and achieving the intended purpose is that the shield excavator is fixed along the circumferential direction to the rear end of the skin plate, and lining is performed by assembling the segments. In a tail seal of a shield machine that is pressed against the outer peripheral surface of the skin plate and seals a gap between the skin plate and the outer peripheral surface of the lining, a ring-shaped groove is formed by opening the inner peripheral surface on the rear side of the skin plate along the circumferential direction. The ring-shaped groove is fitted with a ring-shaped tail packing having a water-stopping function on the inner circumferential surface so as to be slidable in the inner circumferential direction, and the ring-shaped tail packing is covered with the inner circumference on the skin plate side. provided pressing means for pressing in the direction of contact with the outer peripheral surface of the factory, and the ring-shaped tail packing, the inner groove in the peripheral surface is formed by flowable sealing material supply means the concave groove With fluidity sealant is supplied with sex, in the magnetic generating device for the presence of a flowable sealing material having the magnetic the concave groove is connected.
[0014]
In this manner, a ring-shaped groove is provided in the rear inner peripheral surface of the skin plate along the circumferential direction, and a ring-shaped tail packing is slidably fitted in the ring-shaped groove in the inner peripheral direction, and is fitted to the skin plate side. By providing a pressing means that presses the ring-shaped tail packing in a direction where the inner circumference contacts the outer peripheral surface of the lining, the length of the shield machine of the rigid portion can be shortened as compared with the conventional case, and thus the The problem of auction with the engineer can be eased. In addition, the ring-shaped tail packing can prevent fine clearance between the ring-shaped tail packing and the lining by a sealing material present on an inner peripheral surface thereof, and also prevents wear of the ring-shaped tail packing. be able to.
[0015]
The pressing means in the present invention is preferably constituted by a fluid pressure supply system for applying pressure to the outer peripheral surface of the ring-shaped tail packing in the ring-shaped groove. With this configuration, the ring-shaped tail packing can be easily brought into contact with the outer peripheral surface of the lining by the fluid pressure supplied from the fluid pressure supply system.
[0016]
In addition, a fluid sealing material having magnetism is supplied between the plurality of ring-shaped tail packings by a fluid sealing material supply unit, and the fluid sealing material having magnetism is present between the ring-shaped tail packings. Is preferably provided.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
1 and 2 show an example of an embodiment of a tail seal of a shield machine according to the present invention.
[0018]
In the tail seal of the shield machine according to the present embodiment, a ring-shaped groove 11 that is opened along the circumferential direction is provided on the inner peripheral surface on the rear side of the skin plate 2 of the shield machine 1. A ring-shaped tail packing 12 having a water stopping function is fitted in the ring-shaped groove 11 so as to be slidable in the inner circumferential direction. The ring-shaped tail packing 12 is made of a material such as a steel material having sufficient rigidity and a rubber material having flexibility. Sealing means 13 composed of an O-ring that seals by contacting the peripheral surface of the ring-shaped tail packing 12 is embedded in the skin plate 2. On the side of the skin plate 2, there is provided a pressing means 14 for pressing the ring-shaped tail packing 12 in a direction in which the inner periphery thereof comes into contact with the outer peripheral surface of the lining 3. The pressing means 14 is constituted by a fluid pressure supply system 15 for supplying fluid pressure for applying pressure to the outer peripheral surface of the ring-shaped tail packing 12 in the ring-shaped groove 11. In this embodiment, hydraulic pressure is used as the fluid pressure, and a hydraulic passage is provided in the skin plate 2 as the fluid pressure supply system 15 in this embodiment.
[0019]
The ring-shaped tail packing 12 is connected to a magnetic fluid supply means 18 for supplying a fluid sealing material (hereinafter referred to as a magnetic fluid ) 17 having magnetism to a concave groove 16 on the inner peripheral surface thereof. Are connected to a magnetic generator (not shown) for causing the magnetic field to exist in the concave groove 16 .
[0020]
As the magnetic fluid, for example, a fluid obtained by mixing a magnetizable powder such as a magnetite powder with a high-viscosity fluid material having a grease-like viscosity is used. As the high-viscosity fluid material, a synthetic resin can be used in addition to an oily material such as grease.
[0021]
The magnetic fluid supply means 18 is configured by a pipe made of non-magnetic plastic or the like for supplying the magnetic fluid 17.
[0022]
In this manner, a ring-shaped groove 11 is provided in the rear inner circumferential surface of the skin plate 2 along the circumferential direction, and a ring-shaped tail packing 12 is slidably fitted in the ring-shaped groove 11 in the inner circumferential direction. When the pressing means 14 for pressing the ring-shaped tail packing 12 in the direction in which the inner periphery thereof comes into contact with the outer peripheral surface of the lining 3 is provided on the skin plate 2 side, the ring-shaped tail packing 12 is centered by the pressing by the pressing means 14. , And the inner periphery thereof comes into contact with the outer peripheral surface of the lining 3 to perform sealing. In this state, the magnetic fluid 17 is supplied to the concave groove 16 on the inner periphery of the ring-shaped tail packing 12 by the magnetic fluid supply means 18, so that the sealing is performed more favorably. The magnetic fluid 17 also acts as a lubricant, and suppresses wear of the ring-shaped tail packing 12 when the inner circumferential surface of the ring-shaped tail packing 12 comes into contact with the outer circumferential surface of the lining 3 and slides. Can be.
[0023]
Like the tail seal of the shield machine of the present example, a ring-shaped tail packing 12 is slidably fitted in the inner circumferential direction into a ring-shaped groove 11 provided along the circumferential direction on the rear inner circumferential surface of the skin plate 2. When the ring-shaped tail packing 12 is pressed by the pressing means 14 in a direction in which the ring-shaped tail packing 12 comes into contact with the outer peripheral surface of the lining 3, the shield length of the rigid portion can be shortened as compared with the conventional shield excavator 1, so that the curve The problem of the auction between the skin plate 2 and the lining 3 at the time of construction can be alleviated.
[0024]
Further, when the pressing means 14 is constituted by a fluid pressure supply system 15 for applying pressure to the outer peripheral surface of the ring-shaped tail packing 12 in the ring-shaped groove 11, the fluid pressure supplied from the fluid pressure supply system 15 to the ring-shaped tail packing 12 is used. The outer surface of the lining 3 can be easily contacted.
[0025]
When the magnetic fluid supply means 18 for causing the magnetic fluid 17 to be present on the inner peripheral surface of the ring-shaped tail packing 12 and a magnetic generator (not shown) are connected, the ring-shaped tail packing 12 is provided on the inner peripheral surface thereof. Due to the magnetic fluid 17, the fine clearance between the ring-shaped tail packing 12 and the lining 3 can be satisfactorily stopped, and the wear of the ring-shaped tail packing 12 can be prevented.
[0026]
In the above example, an example is shown in which one ring-shaped tail packing 12 is arranged on the inner peripheral surface on the rear side of the skin plate 2, but a plurality of ring-shaped tail packings 12 may be arranged in parallel.
[0027]
As shown in FIG. 3, a magnetic generator and a fluid sealing material supply means 18 are also provided between a plurality of ring-shaped tail packings 12 arranged side by side, and a magnetic fluid 17 is filled between the ring-shaped tail packings. May be.
[0028]
【The invention's effect】
In the tail seal of the shield machine according to the present invention, in the ring-shaped groove provided along the circumferential direction on the rear inner surface of the skin plate, a ring-shaped tail packing having a water-stop function on the inner circumferential surface is provided in the inner circumferential direction. The ring-shaped tail packing is slidably fitted, and the ring-shaped tail packing is pressed by a pressing means in a direction in contact with the outer peripheral surface of the lining, so that the shield length of the rigid portion can be reduced as compared with a conventional shield excavator. Therefore, the auction problem between the skin plate and the lining at the time of curve construction can be eased.
[0029]
Further, when the pressing means is constituted by a fluid pressure supply system for applying pressure to the outer peripheral surface of the ring-shaped tail packing in the ring-shaped groove, the ring-shaped tail packing can be easily formed by the fluid pressure supplied from the fluid pressure supply system. Surface can be contacted.
[0030]
Further , a concave groove is formed in the inner peripheral surface of the ring-shaped tail packing, and a fluid sealing material having magnetism is supplied into the concave groove by a fluid sealing material supply unit, and the fluid sealing material is supplied into the concave groove. When the magnetic generator for the presence of a flowable sealing material having magnetism Ru is connected, a magnetic fluid the ring-shaped tail packing present on the inner peripheral surface thereof, a fine clearance between the lining and the ring-shaped tail packing Water can be satisfactorily performed, and wear of the ring-shaped tail packing can be prevented.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an example of an embodiment of a tail seal of a shield machine according to the present invention.
FIG. 2 is a sectional view of a main part of the above.
FIG. 3 is an enlarged sectional view of a main part of another example of the embodiment of the present invention.
FIG. 4 is a longitudinal sectional view showing a tail seal of a conventional shield machine.
FIG. 5 is an enlarged view of a main part of the above.
FIG. 6 is an explanatory view showing an angle between a center line direction of the shield machine and a center line direction of a lining assembled inside the curve machine at the time of curve construction by the conventional shield machine.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Shield machine 2 Skin plate 3 Lining 4 Tail seal 5 Segment 6 Wire brush 7 Tail clearance 8 Protective spring 9 Tail seal grease 10 Shield jack 11 Ring groove 12 Ring tail packing 13 Sealing means 14 Pressing means 15 Fluid pressure supply System 16 Groove 17 Magnetic fluid (fluid sealing material)
18 Magnetic fluid supply means

Claims (3)

A shield that is fixed along the circumferential direction to the rear end of the skin plate in the shield machine and is pressed against the outer peripheral surface of the lining by assembling the segments to seal a gap between the skin plate and the outer peripheral surface of the lining. In the tail seal of the excavator,
One or a plurality of ring-shaped grooves opened in the circumferential direction on the rear side inner peripheral surface of the skin plate are provided, and the ring-shaped groove has a ring-shaped tail packing having a water stopping function on the inner peripheral surface. in the inner circumferential direction are slidably fitted, the skin on the plate side pressing means for pressing is provided in the direction of its inner circumference the ring-shaped tail packing comes into contact with the outer peripheral surface of the lining and the ring A concave groove is formed in the inner peripheral surface of the tail packing, and a fluid sealing material having magnetism is supplied into the concave groove by a fluid sealing material supply means, and the magnetic fluid having the magnetism is supplied into the groove. A tail seal for a shield machine, wherein a magnetic generator for causing a conductive sealing material to exist is connected . 2. The tail seal according to claim 1, wherein the pressing unit includes a fluid pressure supply system that applies a pressure to an outer peripheral surface of the ring-shaped tail packing in the ring-shaped groove. 3. A fluid sealing material is supplied between the plurality of ring-shaped tail packings by a fluid sealing material supply unit, and the fluid sealing material having magnetism is provided between the ring-shaped tail packings. The tail seal of a shield machine according to claim 1 or 2 , further comprising a magnetic generator .

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