JPH07247789A - Shield method and spacer - Google Patents

Abstract

(57) [Summary] [Purpose] A shield that prevents breakage of a segment having a ridge and a groove and that can assemble a wall body formed by this segment while maintaining its cross-sectional shape in a predetermined state. Providing construction methods and spacers. [Structure] Assembling segments 9 and 9 having ridges 7 and grooves 8 for lining along the inner wall of the tunnel excavated by the cutter device 2 of the shield excavator 1 and arranging the segments 9 and 9 located at the head. The spacer 10 is interposed between the axial end face of the shield excavator 1 and the spreader 6 of the propulsion jack 5 of the shield excavator 1, and the propulsion jack 5 is extended in this state to take a reaction force to the segment 9 to thereby shield the excavator. Advance 1 to dig a tunnel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield construction method using a segment in which a groove or a projection is formed for fitting at least a segment adjacent to an end face in the tunnel axial direction, and a spacer used in the construction method.

[0002]

2. Description of the Related Art Various tunnel construction methods have already been provided. In particular, the shield construction method can be applied to all rocks other than hard rock, and does not affect the above-ground facilities. Since it has the advantage that it is possible, the construction results have been increasing especially in recent years.

In the shield construction method, as shown in FIG. 6, while excavating the natural ground T by a cutter device 2 provided in the front part of the shield excavator 1 main body, the excavated earth and sand are carried out to the rear of the tunnel, and A tubular tunnel wall body 4 is formed by assembling the lining segment 3 along the inner wall of the excavated tunnel. The front end surface of the leading segment 3 that constitutes the tunnel wall body 4 is formed. Propulsion jack 5
The spreader 6 is brought into contact with the spreader 6 to take a reaction force so that the shield excavator 1 is advanced.

[0004]

By the way, in the shield construction method in which the cylindrical tunnel wall body is extendedly formed by sequentially connecting the segments in this manner, the segment used in this construction method is used as shown in FIG. , (B),
As shown in (c), it has been attempted to use a ridge 7 on one of the joint end faces of adjacent segments and a segment 9 having a groove 8 on the other end (commonly referred to as a segment with a groove). The ridge 7 and the groove 8 are formed in a shape that allows them to be fitted in concavo-convex with each other, and are formed on the end surface of the segment 9 along the circumferential direction. In addition, this segment 9
At each edge of the four sides, a plurality of bolt holes 9a for joining with adjacent segments 9 and a plurality of bolt fastening recesses 9b inserted into the bolt holes 9a are provided. According to the segment 9, since the segments 9 and 9 are connected to each other in a state where the protrusion 7 and the groove 8 are fitted to each other, the strength against the external force in the radial direction acting on the tunnel wall 4 is improved. In addition to the above, there is an advantage that the segments 9, 9 ... Comrades can be easily positioned during joining.

However, if the conventional shield excavator 1 is used as it is to assemble the segments, as shown in FIG.
Since it is not possible to ensure a wide contact area by abutting only on the end face of the projecting ridge 7, the pressing force applied from the propulsion jack 5 concentrates on the projecting ridge 7, and an excessive load acts on the segment 9 to project it. There is a problem that Article 7 is damaged. Further, the pressing force applied from the propulsion jack 5 to the segment 9 tends to be an eccentric load, and if the load acts in the radial direction, there is a problem that the roundness of the tunnel wall body 4 cannot be ensured during assembly.

The present invention has been made in view of the above circumstances, and prevents breakage of a segment having ridges and grooves,
Moreover, it is an object of the present invention to provide a shield construction method and a spacer capable of assembling a wall body constituted by these segments while maintaining its cross-sectional shape in a predetermined state.

[0007]

In view of the above, the present invention provides a shield construction method according to claim 1, in which a cutter device of a shield excavator is used to excavate the natural ground, and along the inner wall of the excavated tunnel. Advancing the shield excavator by assembling a lining segment, bringing the spreader of the propulsion jack provided on the shield excavator into contact with the segment, and pulling the propulsion jack by applying a reaction force to the segment. Let me dig into the tunnel,
As the lining segment, at least a segment in which a groove or a ridge is formed for fitting concave and convex with a segment adjacent to the end face in the axial direction of the tunnel is used, and the spreader is brought into contact with the tip face of the segment. An intervening spacer is provided between the rear end surface of the spreader and the front end surface of the segment as a means for solving the above problems.

Further, in the spacer used in the shield construction method according to the first aspect, the spacer has a predetermined thickness dimension and a predetermined width dimension, and is formed in an arc shape, one surface of which is a flat surface. In addition to the above, it is also preferable that the other surface is provided with a fitting groove or a fitting ridge that can be fitted into a groove or a ridge formed on the end surface of the segment in the tunnel axis direction. did.

[0009]

According to the shield method and the spacer of the present invention, when the propelling jack is extended, the pressing force from the propelling jack is transmitted to the segment via the spacer. Therefore, at this time, the spreader does not directly contact the corners of the ridges or grooves of the segment, so that the pressing force from the propulsion jack does not damage the ridges or grooves of the segment.

[0010]

Embodiments of the shield method and spacer of the present invention will be described below with reference to FIGS. 1 to 5.
In the figure, reference numeral 10 is a spacer used in the shield construction method of the present invention. Note that, in the present embodiment, the same reference numerals are given to the portions having the same configurations as those in FIG. 6, and the description will be simplified.

The shield construction method of the present embodiment excavates the natural ground T by the cutter device 2 of the shield excavator 1 shown in FIG. 1 and, along the inner wall of the excavated tunnel, the lining projection shown in FIG. The tunnel wall 4 is constructed by assembling the segments 9 and 9 having the lines 7 and the grooves 8 and the axial end faces of the segments 9 and 9 located at the head of the tunnel wall 4 and the propulsion of the shield excavator 1. A spacer 10 is interposed between the jack 5 and the spreader 6 and the propelling jack 5 is extended in this state to apply a reaction force to the segment 9 to advance the shield excavator 1 to advance the tunnel.

As shown in FIGS. 2 to 4, the spacer 10 is an arc-shaped member made of hard rubber, hard urethane or the like and having a predetermined thickness dimension and a predetermined width dimension. The surface is a flat surface that is in contact with the end surface 12 of the spreader 6, and the other surface is in contact with the segment 9 that is a pressing surface 11 that transmits the pressing force from the propulsion jack 5. There is. On the pressing surface 11,
A fitting groove 14 is formed which can be fitted into the protrusion 7 formed on the end surface 13 of the segment 9 in the tunnel axis direction.

As described above, when the shield excavator 1 is moved forward, if the spacer 10 is interposed between the spreader 6 and the segment 9, the thrust of the propulsion jack 5 will not be concentrated on the ridge 7. Further, since the pressing force is not biasedly transmitted to the segment 9, the protrusion 7 can be prevented from being damaged, and the pressing force can be applied to the segment 9 as well.
Can be transmitted evenly.

Hereinafter, in the shield construction method of this embodiment,
When the extension of the propulsion jack 5 is completed, the propulsion jack 5 is contracted, the spacer 10 is removed from the segment 9,
The spacer 10 is attached to the front side of the segment 9 that is newly installed on the front side of the leading segment 9 in the excavation direction. Hereinafter, the tunnel wall 4 is constructed by repeating the above steps.

Therefore, according to the shield construction method and the spacer of this embodiment, the pressing force of the propulsion jack 5 is transmitted to the segment 9 through the spacer 10, so that the pressing force is applied by the spacer 10 to the axial end surface 1 of the segment 9.
3 is distributed over the entire area, and damage to the segment 9 is prevented.
Further, when transmitting the pressing force, the fitting groove 14 of the spacer 10 is
Since the protrusion 7 of the segment 9 and the protrusion 7 are fitted in
It is possible to secure the roundness of the tunnel wall body 4 at the time of assembly without causing the bias of the pressing force. Since the spacer 10 can be applied to a shield machine having general specifications, the effect can be obtained at a low cost.

In this embodiment, the segment 9
Although the ridge 7 of the axial end face 13 is arranged as the front side in the digging direction, the groove 8 located on the axially opposite side of the ridge 7 of the segment 9 may be arranged as the front side in the digging direction. In this case, the pressing surface 11 of the spacer 10 is provided with a ridge that fits in the groove 8, and the propulsion jack 5 is extended with the ridge and the groove 8 being fitted in a concavo-convex shape. To

Further, in order to prevent the breakage of the corners of the protrusion 7 and the groove 8 when the segment 9 is carried in and moved in the tunnel, as shown in FIG. 5, the end surface of the segment 9 is made of rubber. It is preferable that the sheet is conveyed while being covered with the protective material 20 made of a band, urethane, styrofoam, wood, or the like.

[0018]

As described above, according to the shield construction method and the spacer of the present invention, the pushing force of the propulsion jack is transmitted to the segment through the spacer, so that the pushing force is applied by the spacer to the entire axial end face of the segment. Are distributed over the segment to prevent segment damage. In addition, since the fitting groove of the spacer and the projection of the segment are fitted in a concave-convex shape when transmitting the pressing force, the pressing force is prevented from being transmitted unevenly to the segment, and the tunnel wall body during assembly is not Roundness can be secured. Since the spacer can be applied to a shield machine having general specifications, the effect can be obtained at a low cost.

[Brief description of drawings]

FIG. 1 is a side view showing when a shield excavator in a shield construction method of the present invention is being advanced.

FIG. 2 is a side view showing a spacer used in the shield method.

FIG. 3 is an internal view showing a state in which a spacer is attached to a ridge and a grooved segment used as one example of the shield method.

FIG. 4 is a side view of the segment of FIG.

FIG. 5 is a diagram showing a method of transporting the segment of FIG.

FIG. 6 is a side view showing when a shield excavator in a conventional shield method is being advanced.

7A and 7B are diagrams showing segments with ridges and grooves, in which FIG. 7A is an internal view, FIG. 7B is an axial view, and FIG.
Is a side view in the circumferential direction.

FIG. 8 is a side view showing a contact state between a spreader and a ridge of a segment in a conventional shield construction method.

[Explanation of symbols]

 1 shield excavator 2 cutter device 5 propulsion jack 6 spreader 7 ridge 8 groove 9 segment 10 spacer 11 pressing surface 12 end face 13 end face 14 fitting groove T natural rock

Claims (2)

[Claims] 1. A shield excavator's cutter device excavates the ground while assembling a segment for lining along an inner wall of the excavated tunnel, and a segment of a propulsion jack provided on the shield excavator on the segment. The shield excavator is moved forward by abutting a spreader and applying a reaction force to the segment to extend the propulsion jack, and as a segment for the lining, at least the tunnel axial direction. Using a segment in which a groove or a ridge is formed for fitting concave and convex with a segment adjacent to the end surface of the spreader, when the spreader is brought into contact with the front end surface of the segment, the rear end surface of the spreader and the front end surface of the segment A shield method characterized by interposing a spacer between the two. 2. The spacer used in the shield construction method according to claim 1, wherein the spacer has a predetermined thickness dimension and a predetermined width dimension and is formed in an arc shape, and one surface thereof is flat. A spacer characterized in that the spacer is formed as a surface, and on the other surface, a fitting groove or a fitting ridge that can be fitted into a groove or a ridge formed on the end surface of the segment in the tunnel axis direction is formed.