JP3060426B2 - Lining segment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lining segment used for tunnel excavation and the like.

[0002]

2. Description of the Related Art A conventional lining segment is formed by dividing a completed lining ring into a plurality of arcuate bodies.
For example, a rectangular arc-shaped rectangular segment obtained by dividing a lining ring into a plurality of pieces in a vertical direction (tunnel axis direction) is generally used.

In order to assemble this rectangular segment, after the shield jack of the shield machine has been extended to the limit and excavation for one ring has been completed, only the jack necessary for assembling the segment is reduced and the segment piece (segment) is cut. The main body) is successively incorporated into the segments for which the assembling of one ring of the preceding stage has been completed, thereby performing the construction of one ring of the next stage.

[0004] As described above, the segment pieces are assembled by propelling the shield excavator by one ring and thereafter by one ring at a time. The assembly of the segments and the propulsion of the shield excavator are performed alternately. It is a completely independent and separate construction unit.

[0005]

[Problems to be solved by the invention]
Although high-speed construction is desired, in the conventional construction method of alternately assembling segments and promoting shield excavators, the speed of each construction unit will be increased,
As the method, for example, to increase the speed of excavation, it is conceivable to increase the equipment capacity of the shield machine, and to increase the speed of assembly, adopt a special joint type that is easy to perform (fasten).

However, in such a method, a method different from a normal shield machine and a joint type is adopted.
The cost is high, and the speeding up of the construction is limited.

Therefore, as a means for greatly speeding up the construction, the segments are assembled at the same time while continuing the excavation without stopping the excavation, the excavation of the shield machine and the assembly of the segments are performed simultaneously, and two construction units are formed. A method of performing it as parallel work has been considered.

However, in order to carry out this continuous excavation with a shield excavator or a rectangular segment which has been conventionally used, the excavation is continued after securing an assembling space for the next segment by one ring. The effective stroke length of the shield jack needs to be further extended by one ring, and in order to extend the jack stroke, the length of the shield excavator itself must be extended.

[0009] Extending the length of the shield machine is not only an economic problem, but also causes inconvenience in making the curved surface construction difficult.

Accordingly, an object of the present invention is to eliminate the disadvantages of the prior art and to extend the effective stroke length of the shield jack by a half ring when excavating a shield machine and assembling segments in parallel. It is therefore an object of the present invention to provide a lining segment which does not need to extend the length of the shield machine and can cope with the existing shield machine, and can easily assemble the segments and achieve high-speed construction.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a segment body in which one of two parallel sides in the width direction is a long arc side and the other is a short arc side, and both ends in the circumferential direction are long arc sides. A first rising edge extending from both ends to the middle of the short arc side,
A substantially parallel stepped side having a fixed length toward the center substantially in parallel with the long arc side and the short arc side from the end of the first rising edge, and a second side reaching the short arc side from the center side end of the substantially parallel stepped side. In the lining segment formed in a substantially convex shape formed by the main body portion having a convex portion and the wing portions protruding on both sides of the main body portion, the first rising edge is short.
A tapered shape that spreads outward as it goes toward the arc side
And the second rising edge is directed toward the short arc side.
It is characterized in that it is formed in a tapered shape narrowing to the side, and a shear key is formed on the first rising edge and the second rising edge by a ridge or a groove as a joint between pieces of the segment body.

As described above, according to the present invention, one of the two parallel sides in the width direction of the segment body is a long arc side, and the other is a short arc side, and both ends in the circumferential direction are from both ends of the long arc side to the short arc side. A first rising edge reaching the middle of the first rising edge, a substantially parallel stepped side having a fixed length extending from the tip of the first rising side substantially parallel to the long arc side and the short arc side toward the center, and the center of the substantially parallel stepped side. A lining segment formed in a substantially convex shape formed by a main body portion having a convex portion and a wing portion protruding on both sides of the main body portion at a second rising edge reaching a short arc side from the side tip, so let's assemble. The convex portion of the segment body enters the space between the wing portions of the segment body where the assembly of the previous stage has been completed, and is assembled in a staggered shape with a different level, so the face side of the segment body where the assembly of the previous stage has been completed Is half the width of the segment body When the shield machine is promoted can be secured assembling space of the next segment body can initiate assembly.

The segment body has a convex shape, and the projection is inserted into a space between the wings of the preceding segment body, and the tip of the projection abuts on the long arcuate side of the second stage before the shield. The thrust of the jack can act on a wide range.

[0014]

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a lining segment according to the present invention will be described below with reference to FIGS. First, FIG. 1 is a perspective view of a segment main body of a lining segment of the present invention, and the segment main body 1 has, as a basic configuration, one of two parallel sides in the width direction as an elliptic arc side 2 and the other as a short arc side 3, Both ends in the circumferential direction are a first rising edge 4 extending from both ends of the long arcing side 2 to the middle of the short arcing side 3, and the center is substantially parallel to the long arcing side 2 and the short arcing side 3 from the tip of the first rising edge 4. The segment body 1 is composed of a substantially parallel stepped side 5 having a constant length toward the side and a second rising side 6 reaching the short circular arc side 3 from the center end of the substantially parallel stepped side 5 to form a main body having a projection 9. The main body 7 has a substantially convex shape formed by a wing 8 protruding from both sides of the main body 7.

In the segment body 1 having such a shape,
The first rising edge 4 and the second rising edge 6 may be formed at right angles to the long arc side 2 and the short arc side 3, but in the present embodiment, the first rising edge 4 is connected to the short arc side 3 The second rising edge 6 is formed in a tapered shape that narrows inward toward the short arc side 3 as it goes toward.

The projection 9 and the wing 8 have substantially the same width, and as a joint between the pieces of the segment body 1, as shown in FIG. 4, a shear key 11 formed by a ridge is formed, and a shear key 12 formed by a groove is formed on the second rising edge 6 which is a side surface of the convex portion 9.

As will be described later, this segment body 1
Since one stage is assembled about every other piece, it is continuous in the circumferential direction in a state where two stages are assembled. In the present embodiment, as an example, the two stages are evenly divided into six equal parts in the circumferential direction.

The lining segment assembled by using the segment body 1 is composed of the preceding segment body 1b.
As shown in FIGS. 2 and 3, the distance between the wing portion 8 and the adjacent segment main body 1 is equal to the width of the convex portion 9 with the elongated arc side 2 facing the face. Open and assemble every other piece in the circumferential direction.

With respect to the preceding segment main body 1b,
Next-stage segment body 1a assembled to the next stage on the face side
Is the wing portion 8 of the preceding segment body 1b.
It is inserted into the space between the two, and the tip of the convex portion 9 is brought into contact with the long arc side 2 of the segment main body 1a 'at the second stage before, so that it is assembled in a staggered shape with a step difference.

Next, the assembling method will be described. The shield jacks 10a and 10b installed on the shield machine are:
As shown in FIGS. 3 and 4, the segment is disposed at a position where the maximum stroke length is equal to the length of one ring of the segment main body 1 plus the setback amount. Here, the setback amount is a stroke length required for inserting the segment body 1 by setting the shield jacks 10a and 10b on the assembled segment body 1 and
This amount is insignificant.

Therefore, for example, the shield jack 10
In the case of an existing shield excavator in which the stroke lengths a and 10b are set to half a ring, the shield jack 10 is then moved a distance equal to the half ring and the setback amount.
What is necessary is just to displace a and 10b to the face side.

FIG. 2 shows a state in which the segment main body 1 is continuously assembled in the circumferential direction by two rings of the segment main body 1a 'at the second stage and the segment main body 1b at the previous stage. In this state, the jack shown in FIG. As shown in the diagram showing the relationship between the stroke and the time, the shield jack 10a set in the segment body 1a 'at the last stage is extended to the maximum stroke length obtained by adding the setback amount to one ring, and The shield jack 10b set on the segment body 1b at the previous stage has been extended to a length obtained by adding the setback amount to a half ring, and the propulsion is being continued.

From this state, the segment main body 1 at the stage immediately before the stage 1
If the shield jack 10a set to a 'and extended to the maximum stroke length is reduced, a space for incorporating the next segment main body 1a is secured on the face side of the segment main body 1a' at the stage immediately before.

Therefore, the operation of the shield jack 10a is stopped, the segment main body 1a is assembled, and the projection 9 of the segment main body 1a is inserted between the wing portions 8, 8 of the segment main body 1b in the axial direction of the tunnel. At this time, the seal jack 10a extends by the setback amount. Next, the segment body 1 is fastened in the circumferential direction and the axial direction, during which the shield jack 10a stops. Then, after completion of the fastening, the extension of the shield jack 10a is started, and the shield machine is excavated.

As described above, while the shield jack 10a set in the segment main body 1a 'is contracted, stopped, and set length is extended, stopped, and extended, the shield jack 10a is staggered with the segment main body 1a'. As shown in FIG. 5, the shield jack 10b set in the combined segment body 1b continues propulsion, and when the shield jack 10b extends the maximum stroke length, the shield jack 10a reduces the setback amount. Stroke length is increased by half a ring.

This is the state shown in FIG. 4, and the relationship between the shield jacks 10a and 10b is opposite to that shown in FIG. By repeating this, the segment main body 1 is assembled in a staggered shape with a step in a state in which the segment main body 1 protrudes by half a ring toward the face every other piece.

In the segment main body 1 which is assembled in a staggered manner, the substantially parallel stepped side 5 of the wing portion 8 abuts on the long arcuate circle 2 of the front stage, and the short arcuate side 3 of the projection 9 is the long front end of the long arcuate circle. 2, the ring rigidity is increased, and the ring is equally divided in the circumferential direction.
The thrusts a and 10b can be applied over a wide range, and the unbalanced load caused by removing the shield jack during assembly can be minimized.

Also, since all the segment bodies 1 are assembled by inserting them in the axial direction of the tunnel, the operation is simplified and the assembly quality is improved.

Further, when the segment body 1 is divided into even numbers, the erector used for assembling the segment body 1 can be used to hold half of the segment body 1 at a time, so that the assembling time is greatly reduced. Shorten.

[0031]

As described above, according to the lining segment of the present invention, when the excavation of the shield machine and the assembly of the segment are performed simultaneously in parallel, the effective stroke length of the shield jack can be extended. With only a half ring, it is not necessary to extend the length of the shield machine, it can be used with existing shield machines, and the assembly of segments is easy and high-speed construction can be achieved.

[0032]

[Brief description of the drawings]

FIG. 1 is a perspective view of a segment main body showing an embodiment of a lining segment of the present invention.

FIG. 2 is a perspective view of a segment ring showing an embodiment of a lining segment of the present invention.

FIG. 3 is a development view showing a first step in a state of assembling the segment ring, showing an embodiment of the lining segment of the present invention.

FIG. 4 is a development view showing a second step in a state of assembling the segment ring, showing the embodiment of the lining segment of the present invention.

FIG. 5 is a curve diagram showing the relationship between jack stroke and time, showing an embodiment of the lining segment of the present invention.

[Explanation of symbols]

 1, 1a, 1a ', 1b Segment main body 2 Long arc side 3 Short arc side 4 First rising edge 5 Substantially parallel step side 6 Second rising edge 7 Main body portion 8 Wing portion 9 Convex portion 10a, 10b Shield jack 11 Ridge Shear key 12 Groove shear key

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E21D 11/08 E21D 11/04

Claims (1)

(57) [Claims] 1. One of two parallel sides in the width direction of a segment body is an oval arc side, and the other is a short arc side. Both ends in the circumferential direction are a first rising edge extending from both ends of the long arc side to a middle of the short arc side. A substantially parallel stepped side having a fixed length substantially parallel to the long arc side and the short arc side from the end of the first rising side toward the center, and a short arc side reaching the short side from the center side end of the substantially parallel stepped side. A lining segment formed of a main body portion having a convex portion and wing portions protruding on both sides of the main body portion, wherein the first main rising edge is short; Wider outward toward the arc side
And the second rising edge narrows inward toward the short arc side.
Maru and tapered, lining for the segment, characterized in that, formed respectively shear keys by ridges or the grooves of the piece between the joint portion of the first erected upper side and the second erected segment body to the upper side .