JPS63181899A - Shield excavator - 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 relates to a shield excavator suitable for use in constructing a tunnel lining using cast-in-place concrete.

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

(C) 0 A sudden point while the invention is trying to solve the problem.However, curve construction is still being carried out (here, curve construction is a method of forming a new lining by shifting it by a predetermined angle with respect to the existing lining). The technology to smoothly carry out this work has not yet been established, and there is an urgent need to develop a shield excavator that can smoothly carry out the work when constructing the curve. It's broken.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a shield excavator that can smoothly perform work even when constructing a curve.

(d) Means for solving 8 problems, that is, the present invention has an outer shell (2), and a press ring (7) inside the outer shell (2). A formwork support member (11) is provided inside the press ring (7) so as to be freely movable and driven in the excavation direction.

It is provided so as to be movable and driveable with respect to the outer shell (2), and furthermore, at least the formwork support member (11) is divided into a plurality of parts, and the divided parts (11a, 11b) are independently connected to the outer shell (2). 2) It is constructed so that it can move in the excavation direction.

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. Below “(e)0
The same applies to the column "Effect".

(e) 6 Effects With the above configuration, the present invention allows the shield excavator (1) to move the formwork support member (11) even when performing curve construction.
The excavation works by stably taking reaction force from the diagonally installed formwork (13) through the divided parts (lla, 1lb).

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

FIG. 1 is a plan sectional view showing an embodiment of a shield excavator according to the present invention, and FIG. 2 is a sectional view taken along the line ■-■ in FIG.

FIG. 3 is a sectional view taken along the line m-m in FIG. 1, and FIG. 4 is an enlarged view of the jacking part of the shield excavator.

FIG. 5 is a sectional view taken along the line ■-■ in FIG. 4, and FIGS. 6 to 13 are process diagrams showing how the lining is spliced and formed in a straight line using the shield excavator according to the present invention. FIG. 14 is a plan sectional view showing how a curve is constructed using the shield excavator according to the present invention.

As shown in FIG. 1, the shield excavator 1 has a cylindrical outer shell 2, and the front surface of the outer shell 2, that is, the first
A cutter 3 is rotatably supported on the left side of the figure. The cutter 3 is driven by 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.
Further, a plurality of digging jacks 6A and 6B are connected to the partition wall 2a, respectively, as shown in FIG.

They are divided into left and right sections in the figure, and are arranged along the outer shell 2 at predetermined intervals. Excavation jack 6A, 6B
As shown in FIG. 1, the rams 6a and 6b are
It is provided so as to be able to protrude and retreat in the directions of arrows A and B, and further inside the outer shell 2 is a press ring 7 formed in a cylindrical shape.
is provided in contact with the inner surface of the outer shell 2 and is slidable in the directions of arrows A and B.

As shown in FIGS. 2 and 3, the press ring 7 is divided into two parts on the left and right in the figure, and the press ring 7 is formed into a semi-cylindrical shape and has two press ring pieces 7a and 7b. have. Note that the press ring pieces 7a and 7b are combined in such a manner that they can each independently move in the excavation direction of the outer shell 2, that is, in the direction perpendicular to the plane of the paper in the figure, and the press ring pieces 7a and 7b each have a A plurality of press ring jacks 9a, 9b are arranged along the outer shell 2 at predetermined intervals.

Further, each of the press ring pieces 7a, 7b has a plurality of concrete discharge pipes 10 connected to the press ring pieces 7a, 7b through a discharge port 10a at the tip, as shown in FIGS. 2 and 5.
b side faces 7c and 7d, that is, facing the rear of the shield excavator 1, and each concrete discharge pipe 10 has a discharge pipe cleaning cylinder 10b with a rod 10c protruding in the direction of arrow C1D so as to be freely retractable. It is set up in the shape of

Note that a concrete supply hose 30 is connected to the discharge pipe 10.

Further, a gauge ring 11 formed in an annular shape is attached to the tip of each ram 6a, 6b of the excavation jacks 6A, 6B, and the gauge ring 11 has a ring shape as shown in FIGS. 2 and 3. , is divided into two parts on the left and right in the figure in a manner that is aligned with the press ring pieces 7a and 7b. That is, the gauge ring 11
are gauge ring pieces 11a, ll formed in a semicircular shape.
gage ring pieces 11a, 11b.
are combined in such a manner that they can be moved independently by excavation jacks 6A and 6B in the excavation direction of the outer shell 2, that is, in the direction perpendicular to the plane of the paper in the figure. In addition, gauge ring piece 1
Engagement grooves 11c and lids are formed in semicircular shapes along the outer peripheries of gauge ring pieces 11a and 11b, respectively, and engagement grooves 11c and lids are formed in the engagement grooves 11c and lid as shown in FIG. As shown, a reinforcing member 12 such as a reinforcing bar is inserted.

Furthermore, as shown in FIGS. 2 and 3, the gauge ring 11 is provided with a mold 13 that is assembled into a ring shape and connected in the left-right direction in FIG.

Since the shield excavator 1 has one or more configurations,
When excavating the tunnel 15, the drive motor 5 rotates the cutter 3, and the excavation jacks 6A, 6B
are driven synchronously to cause each ram 6a, 6b to protrude in the direction B of FIG. 1 at the same speed and by the same distance.
When the cutter 3 is pressed in the direction of the face 16, that is, in the direction of arrow A, through the outer shell 2 and the outer shell 2, the cutter 3 and the face 16 come into contact with a predetermined contact pressure, and the face 16 excavates with the cutter 3. At the same time, the outer shell 2 excavates linearly in the entrance direction, and the tunnel 15 is excavated by the shield excavator 1.
It is formed linearly to the rear of , that is, to the right in Figure 1.

In this way, as the tunnel 15 is formed linearly, the lining 2 is installed to prevent the excavated ground 19 from collapsing.
Although it is necessary to construct the lining 20, the construction of the lining 20 is performed in the following steps.

That is, when the shield excavator 1 has excavated in the inward direction by a length Ll corresponding to one ring of the formwork 13, the rams 6a and 6b of the excavation jacks 6A and 6B, as shown in FIG. Each of them is in a state of protruding in the B direction, and the press ring 7 is also in a state of being moved in the B direction with the press ring pieces 7a and 7b aligned. Incidentally, since the moving operations of the ram 6a (therefore, the gauge ring piece 11a) and the ram 6b (therefore, the gauge ring piece 11b) are exactly the same, in FIG.
Only the ram 6a and the gauge ring piece 11a are shown. Also, regarding press ring 7.

For the same reason, only the press ring piece 7a is illustrated.

The same applies to FIGS. 7 to 13 below.

In this state, both rams 6a and 6b are set to A. Distance in the direction! LL
(see Figure 7). Then, the end stop 22A and formwork 1 of the part where concrete 21 was poured just before
3A, the gauge ring 11 moves away from the gauge ring 11 in the direction A, and a space of distance L1 is formed between the gauge ring 11 and the end stop 22A and the formwork 13A. At this time, since the moving distances of the rams 6a and 6b are the same, the gauge ring pieces 11a and llb move in alignment with each other without shifting in the directions of arrows A and B.

Next, in this state, the reinforcing member 12 is installed in the space through the engagement groove 11c and the lid, together with the end stop 22B, as shown by the imaginary line in FIG. Furthermore, a formwork 13B is assembled and installed in contact with the formwork i3A, and a concrete placement space 23 is formed between the formwork 13B and the gauge ring 11 (end stop 22B), press ring 7, and end stop 22A. .

In this state, as shown in FIG. 8, the concrete supply pipe 25 is connected to the formwork 13B.
Concrete 21 is placed in concrete placing space 23 by
to be poured. In addition, at this time, the concrete placement space 23
The air inside is removed through an air vent pipe 13 appropriately provided in the formwork 13.
Since the concrete 21 is discharged to the outside by a, the pouring operation of the concrete 21 into the concrete placement space 23 is performed smoothly.

When the concrete 21 has been placed in the concrete placement space 23 in this way, as shown in FIG. 9, the press ring jacks 9a and 9b are driven synchronously to release the press ring piece 7a.

7b is gradually retreated in the incoming direction by the same distance.

Then, after the press ring pieces 7a and 7b pass,
A space 26 between the outer shell 2 and the poured concrete 21
is formed. Therefore, as the press ring pieces 7a and 7b (that is, the press ring 7) move in the incoming direction, concrete 21 is injected into the space 26 from the concrete discharge pipe 10, as shown in FIG. is filled with concrete 21.

The press ring pieces 7a and 7b move in the inward direction, and the 11th
As shown in the figure, when the side surfaces 7c and 7d are approximately aligned with the installation position of the end stop 22B on the gauge ring 11 side, the digging jacks 6A and 6B are driven synchronously as shown in FIG. Then, the rams 6a and 6b are driven to protrude in the B direction at the same speed, and the cutter 3 is rotated to start the excavation operation. Then, as described above, the outer shell 2 starts moving in the direction A, 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 entry direction, the press ring jacks 9a and 9b are synchronously driven to gradually move the press rings 7a and 7b in the B direction in synchronization with the movement of the outer shell 2. move at the same speed. Then, the side surfaces 7c and 7d of the press ring pieces 7a and 7b are as follows.
They move in the B direction in an aligned state, and the unhardened concrete 21 in the concrete placement space 23 and space 26 that was placed earlier is pressed in the B direction by the side surfaces 7c and 7d, filling the tail void 27. Flowing in shape.

In this way, as shown in FIG. 13, when the press ring 7 is moved in the direction B as the outer shell 2 moves in the A direction, the tail void 27 generated as a result of the movement of the outer shell 2 is
It is filled effectively.

In this way, when the outer shell 2 is propelled by one ring, the press ring 7 has its side surfaces 7c and 7d aligned with the rear end of the outer shell 2, as shown in FIG. 2
Construction of 0 is completed. In addition, at this time, concrete 2
As shown in FIG. 1, the first pouring surface 29 is formed into a single step shape by the movement of the press ring 7.

In addition, in the above-mentioned embodiment, a case was described in which the lining 20 was formed in a straight line in the A direction, but the excavation direction of the shield excavator 1 was gradually changed from the entry direction to the left (
In Fig. 14, the case where the curve is constructed instead of the lower left shoulder in the figure will be explained below. Note that the same parts as those explained in FIGS. 1 to 13 are given the same reference numerals, and the explanation of the parts will be omitted.

That is, when the shield excavator 1 has dug in the A direction by a length Ll corresponding to one ring of the formwork 13B, the rams 6a and 6b of the excavation jacks 6A and 6B are in a state where they are thrust in the B direction. The press ring 7 is also moved in the direction B with the press ring pieces 7a and 7b aligned (see FIG. 6).・Therefore, the digging jacks 6A and 6B are driven to cause the rams 6a and 6b to protrude in the direction B, as shown in FIG.
Distance @L3, L2 (however, 1, L 3>L 2>L
i) retreat in direction A. Then, the gauge ring pieces 11a and llb are separated from the end stop 22B and formwork 13B of the part where the concrete 21 was placed just before, and further moved in the A direction by distances L3 and L2, and are removed from the end stop 22B and the formwork 13B. A space is formed between the frame 13B and the gauge ring pieces 11a, llb.

Therefore, as shown in FIG. 14, the reinforcing member 12 is installed in the space through the engagement groove 11c and the lid, and the end stop 22Dti is installed. Furthermore, formwork 13D,
It is installed so as to be connected to the formwork 13B via an annular straightening block 32 whose thickness gradually decreases downward in the figure. Then, the outer circumferential surface 13d of the formwork 13D in the figure is indicated by one arrow A.
It will be held in a state shifted downward from the left shoulder in the figure by a predetermined angle from the direction, and the outer peripheral surface 13d and the gauge ring piece 1
1a, 11b (end stop 22D), press ring piece 7a,
Concrete placement space 2 between 7b and end stop 22B
3 is formed. At this time, the gauge ring piece 11b is positioned at a position shifted to the rear of the outer shell 2 (in the direction of arrow B) than the gauge ring piece ILa, so the formwork 13D installed obliquely in the figure are supported by the gauge ring pieces 11a and 11b with their left side surfaces in contact with the gauge ring pieces 11a and llb.

In this state, concrete 21 is cast and filled into the concrete casting space 23. When the concrete 21 is filled, the press ring jacks 9a and 9b are driven to gradually retreat the press ring pieces 7a and 7b in the A direction, and the concrete 21 is discharged from the concrete discharge pipe 10 in the B direction. Then, the space 26 (see FIG. 9) created by the movement of the press ring pieces 7a, 7b is filled.

In this way, the press ring pieces 7a and 7b move in the inward direction, and the collar surfaces 7c and 7d are aligned with the end stop 22 of the gauge ring 11.
When the rams 6a and 6b are approximately aligned with the installation position D, the rams 6a and 6b are each independently driven to protrude a predetermined distance in the B direction. Then, the shield excavator 1 gradually changes its excavation direction to the left from the entry direction (in FIG. (lower left shoulder in the figure), and the cutter 3 starts the excavation operation. Then, the outer shell 2 also gradually changes direction to the left from the input direction, and after the outer shell 2 moves, a tail void 27 is formed between the poured and filled concrete 21 and the ground 19. (See Figure 12). Therefore, as the outer shell 2 moves, the press ring jacks 9a, 9b are driven to release the press ring pieces 7a, 7b.

The outer shell 2 is gradually moved rearward in synchronization with the movement of the outer shell 2. Then, the unhardened concrete 21 in the concrete placement space 23 and the space 26 is pressed by these press ring pieces 7a and 7b, and the tail void 27
It flows in the form of filling.

In this way, as the outer shell 2 moves, the press ring piece 7a
, 7b to the rear of the outer shell 2, the tail void 27 is effectively filled6.
Since the press ring piece 7a gradually changes direction and moves from the direction to the left, that is, downward to the left shoulder in FIG. , press ring piece 7
The tail void 27 can be evenly filled by increasing the filling amount by protruding in the direction B by a predetermined distance longer than b.

In the above-mentioned embodiment, the case where both the gauge ring 11 and the press ring 7 were divided into two parts was described, but only the gauge ring 11 was divided into two parts and the press ring 7 was divided into two parts.
The seal 1 (excavator 1 may be constructed by itself) without being divided into two parts.

Further, in the above-described embodiment, the case where the gauge ring 11 etc. was divided into two parts was described, but it goes without saying that it may be divided into more parts depending on the situation of curve construction.

(g) 0 Effects of the Invention As explained above, the present invention has an outer shell 2, and a press ring 7 is provided inside the outer shell 2 so as to be freely movable and driven in the excavation direction of the outer shell 2, A mold support member such as a gauge ring 11' is provided inside the press ring 7 so as to be movable relative to the outer shell 2.

Furthermore, at least the formwork support member is divided into a plurality of parts, and the divided parts (for example, the gauge ring pieces 11a
, 11b) can independently move the formwork support member for each divided portion without digging the outer shell 2 independently. Therefore, even when performing curve construction, it is possible to allow the shield excavator 1 to excavate through the divided portion while stably absorbing the reaction force through the diagonally installed formwork 13.
This force allows construction work to be carried out smoothly. Furthermore, when the press ring 7 is divided into multiple pieces, the amount of filling material such as concrete 21 can be adjusted depending on the location of the tail void 27, so the tail void 27 can be effectively filled even when constructing a curve. You can.

[Brief explanation of the drawing]

FIG. 1 is a plan sectional view showing one embodiment of a shield excavator according to the present invention, FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1, and FIG.
A cross-sectional view taken along the line ■-■ in the figure, Figure 4 is an enlarged view of the jacking part of the shield excavator, 1□ t-1"!1JLJ□ + FM - -, -
-+^, , --- Figures 6 to 13 are process diagrams showing how the shield excavator according to the present invention is used to form the lining in a straight line, and Figure 14 is the shield according to the present invention. FIG. 2 is a plan cross-sectional view showing how a curve is constructed using an excavator. 1...Shield excavator 2...-Outer shell 7...Press ring 11...Form support member (gauge ring) 1.1
a, 41b...Split part (gauge ring piece) Original person Mitsui Construction Co., Ltd. agent Patent attorney Phase 1) Shinji (and 2 others) Figure 6 Figure 8 Figure 10

Claims (1)

[Scope of Claims] It has an outer shell, a press ring is provided inside the outer shell so as to be movable and driven in the excavation direction of the outer shell, a form support member is provided inside the press ring, and a formwork support member is provided on the inner side of the press ring, and a form support member is provided on the inner side of the press ring. A shield excavator is provided so as to be freely movable and driveable relative to the outer shell, and the shield excavator is further configured such that at least the form support member is divided into a plurality of parts, and the divided parts can be independently moved in a direction in which the outer shell is excavated.