JPS62206198A - Method of constructing tunnel lining - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention is applied to constructing a tunnel lining using cast-in-place concrete to construct a tunnel lining constructed using a shield excavator. Regarding.

(b) Prior Art Recently, various proposals have been made for constructing the lining of a tunnel, which has been previously excavated by a shield excavator, using cast-in-place concrete.

(C) 0 Problems to be Solved by the Invention However, a technology for effectively and economically filling tail voids has not yet been established, and a lining that can reliably and economically fill the tail voids has not yet been established. There is an urgent need to develop a construction method.

In view of the above circumstances, it is an object of the present invention to provide a method for constructing a tunnel lining that can reliably and economically fill and fill tail voids.

(d) Means for solving the six problems, that is, the present invention has an outer shell (2), an inner ring (31) is provided inside the outer shell (2), and the outer shell (2) Sand-filled cylinder (32)' between the inner ring (31) and the inner ring (31)
Using a shield excavator (1) equipped with a sand filling cylinder (32) equipped with a sand extrusion means (33a), the tail void (27) generated during construction of the lining (20) is filled with the sand filling cylinder (32). The sand (36) filled in the cylinder (32) is pushed out toward the tail void (27) by the sand pushing means (33a).

Note that the numbers in parentheses are for convenience and indicate corresponding elements in the drawings, and therefore, this description is not limited to the descriptions on the drawings. The following r (el
The same applies to the column ``, action''.

(e) 0 effect With the above-described configuration, the present invention provides the sand extrusion means (3
3a) pushes out the sand (36) in the sand filling cylinder (32) toward the tail void (27),
7).

(1), Example Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a front sectional view showing an example of a shield excavator to which the method of constructing a lining according to the present invention is applied, and FIGS. 2 to 8 are process diagrams showing an example of the method of constructing a lining according to the present invention. be.

As shown in FIG. 1, the shield excavator 1 has a cylindrical outer shell 2, and a cutter 3 is rotatably mounted on the front surface of the outer shell 2, that is, on the left side of FIG. Supported.

The cutter 3 is connected to a drive motor 5 provided on a partition wall 2a of the outer shell 2, which is provided to block the space inside the outer shell 2 in the left-right direction.
A plurality of them are arranged in an annular shape along the outer shell 2. The excavation jack 6 is provided with a ram 6a that can protrude and retreat in the direction of the arrow A1B, and furthermore, an inner ring 31 formed in a cylindrical shape is provided inside the outer shell 2 and extends along the inner circumference of the outer shell 2. It is set in the form. A sand-filled cylinder 32 is formed in an annular shape between the outer shell 2 and the inner ring 31.
A ring piston 33a similarly formed in an annular shape is engaged with the sand filling cylinder 32 so as to be slidable in the directions of arrows A and B. The ring piston 33m is provided movably and driven by a sand filling jack 33 which is arranged annularly at predetermined intervals along the outer shell 2, and on the left side of the sand filling cylinder 32 in FIG. A sand supply hose 35 is connected.

By the way, a gauge ring 11 formed in an annular shape is attached to the tip of the ram 6a of the digging jack 6.
The gauge ring 11 has an engagement groove 1 as shown in FIG.
1a is formed in an annular shape around the entire circumference of the gauge ring 11. Further, the gauging ring 11 is provided with an annular formwork 13 that is connected in the left-right direction in FIG.

Since the shield excavator 1 has the above configuration,
When excavating the tunnel 15, the drive motor 5 rotates the sacrificial cutter 3, and the ram 6 of the excavation jack 6
a to protrude in the direction B in FIG.
The cutter 3 is pressed in the direction of the face 16, that is, in the direction indicated by the arrow. Then, due to the pressing force, cutter 3 and face 1
6 are in contact with each other under a predetermined contact pressure, the face 16 is excavated by the cutter 3, and at the same time, the outer shell 2 is propelled in the direction A, and a tunnel 15 is formed at the rear of the shield excavator 1, that is, to the right in FIG. Teyu (.

As the tunnel 15 is formed in this way, it is necessary to construct the lining 20 to prevent the excavated earth 19 from collapsing, and the construction of the lining 20 is performed in the following steps. That is, the shield excavator 1
When the ring length Ll t4 is dug in the A direction, the ram 6a of the excavation jack 6 is in the state of protruding in the B direction as shown in FIG. The ring piston 33a is also in a state of protruding movement in the B direction.

In this state, as shown in FIG. 3, the ram 6a is moved back in the A direction by a distance L1. Then, the gauge ring 11 separates from the stop 22 and formwork 13 of the part where the concrete 21 was placed just before and moves in the direction A, and the end stop 2
2A and the distance glL between the formwork 13A and the gauge ring 110.
A space called 1 is formed. Therefore, a third
As shown by the imaginary line in the figure, the reinforcing member 12 made of a steel plate, reinforcing bar, etc. is installed together with the end stop 22 through the engagement groove 11a, and the formwork 136 is assembled and installed in contact with the formwork 13A. Frame 13 & gauge ring 11 (end stop 228)
, a concrete placement space 23 is formed between the inner ring 31 and the end stop 22A. Also, at this time, the sand filling jack 33 is driven to move the ring piston 33a from the previously protruding state in the direction of arrow A, thereby bringing it into the retracted state.

In this state, as shown in FIG.
Sand 36 is supplied into the interior via a sand supply hose 35. A fluidizing agent that increases the fluidity of the sand particles is added to the sand 36 as an additive (for example, a thickener such as water-soluble cellulose ether or high-molecular polyethylene oxide is mixed at a weight ratio of 1 to 3%). ), the sand 36 is smoothly supplied from the sand supply hose 35 into the sand filling cylinder 32.

Next, as shown in Figure 5, the concrete formed earlier is
1. Connect the concrete supply pipe 25 to the pouring space 23, and pour concrete 21 into the concrete pouring space 23 using the concrete supply pipe 25.

When the concrete 21 has been placed in the concrete placement space 23 in this way, as shown in FIG. Start.

Then, as described above, the outer shell 2 starts to move in the inward direction, and after the outer shell 2 moves, the tail void 27 is formed between the poured and filled concrete 21 and the ground 19. Therefore, as the outer shell 2 moves in the A direction, the sand filling jack 33 is driven to gradually move the ring piston 33a in the B direction in synchronization with the movement of the outer shell 2, as shown in FIG. let Then, the sand 36 filled in the sand filling cylinder 32 is pressed by the ring piston 33a and pushed out in the direction of the tail void 27, filling the tail void 27.

Incidentally, after advancing a predetermined distance am+, the sand filling cylinder 3
When the sand 36 in the sand filling cylinder 32 runs out, as shown in FIG. Then, as shown in FIG. 8, excavation is resumed again. In this way, when the ring piston 33 is moved in the artB direction as the outer shell 2 moves in the entry direction, the tail void 27 generated as a result of the movement of the outer shell 2 is removed by the sand 36.
It will be filled more effectively.

In addition, since the ring piston 33a is formed into an annular shape, the sand 36 is pressed with uniform pressure over the entire circumference of the ring piston 33a, and therefore the filling operation of the tail void 27 is uniform over the entire circumference of the outer shell 2. Made in good condition.

In this way, when the outer shell 2 is propelled by one ring, the state shown in FIG. 2 is reached, and the construction of the lining 20 for one ring is completed.

(g) 0 Effects of the Invention As explained above, according to the present invention, the inner ring 31 is provided inside the outer shell 2, and the outer shell 2 and the inner ring 3
Using the shield excavator 1, which is equipped with a sand filling cylinder 32 between the sand filling cylinder 32 and a movable ring piston 33a, the sand filling cylinder 32 is used to fill the tail void 27 that occurs when constructing the lining 20. Filling cylinder 32
Since the sand 36 filled inside is pushed out by the ring piston 33m, the tail void 27 is effectively filled with the sand 36 under pressure by the ring piston 33a, resulting in a highly reliable tunnel. It becomes possible to construct a lining.

Furthermore, since the material filled in the tail void 27 is sand 36, it is more economical than when ordinary mortar or concrete is used as the filling material.

[Brief explanation of drawings]

FIG. 1 is a front sectional view showing an example of a shield excavator to which the method of constructing a lining according to the present invention is applied, and FIGS. 2 to 8 are process diagrams showing an example of the method of constructing a lining according to the present invention. be. 1... Shield excavator 2... Outer shell 15... Tunnel 20... Lining 27... Tail void 31... Inner Ring 32...Sand filling cylinder 33a...Sand extrusion means (ring piston) 36...Sand applicant Mitsui Construction Co., Ltd. agent Patent attorney Phase 1) Shinji (and others 1) Figure 2 Figure 4 Figure 6

Claims (2)

[Claims] (1) A shield having an outer shell, an inner ring provided inside the outer shell, a sand-filled cylinder provided between the outer shell and the inner ring, and a means for pushing out sand provided in the sand-filled cylinder. Construction of a tunnel lining constructed by using an excavator to fill the tail void that occurs during construction of the lining by pushing out the sand filled in the sand filling cylinder toward the tail void side using the sand extrusion means. Method. (2) The method for constructing a tunnel lining according to claim 1, wherein the sand contains a fluidizing agent as an additive that increases the fluidity of the sand particles.