JPS63161298A - 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 capable of constructing a lining using cast-in-place materials such as 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 Problems to be solved by the invention However, the technology for effectively filling tail voids has not yet been established, and there is an urgent need to develop a shield excavator that can reliably fill the tail voids. ing.

In view of the above circumstances, it is an object of the present invention to provide a shield excavator that can reliably fill the tail void.

(d) Means for solving the zero problem, that is, the present invention has an outer shell (2), a press ring (7) inside the outer shell (2), and a press ring (7) for one bending movement of the outer shell. The press ring (7) is provided with a means (10) for injecting the casting material (21), and the injection means (10) An injection i measuring means (34) is provided for measuring the amount of pouring material, and the press ring drive means (9) is used to A press ring movement control means (33) is provided to control the movement of the press ring (7), and a form support member (11) is provided inside the press ring (7) so as to be movable relative to the outer shell (2). The formwork support member (11) is provided with an excavation jack (6).

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

(e) Zero effect With the above-described configuration, the press ring (7) pressurizes the injected pouring material (21) to create tail voids (
27) Since the material is filled by being pushed into the inside, the tail void (27)j is reliably filled with the casting material.

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

FIG. 1 is a front sectional view showing an 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.
Figure 4 is an enlarged view of the jacking part of the shield excavator; Figure 5 is a sectional view taken along line II-I of Figure 4; Figures 6 to 1
FIG. 3 is a process diagram showing an example of constructing a shield lining using a bending machine 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 excavation jacks 6 are arranged on the partition wall 2a in an annular arrangement along the outer shell 2, as shown in FIGS. 1 and 2. Excavation jack 6
A ram 6a is provided to be able to protrude and retreat in the directions of arrows A and B, and a press ring 7 formed in a cylindrical shape is provided inside the outer shell 2 so as to be in contact with the inner surface of the outer shell 2. ,,
It is provided so as to be slidable in the B direction. As shown in FIG. 2, on the press ring 7, a plurality of press ring jacks 9 are arranged along the outer shell 2 at predetermined intervals. In between, the second
As shown in FIG. 5 and FIG.
a, that is, it is provided facing toward the rear of the shield excavator 1. The concrete 1/discharge pipe 10 is provided with a cylinder 10b for cleaning the inside of the discharge pipe in the form of a rod 10c that can protrude and retreat freely in the directions of arrows C and D.
0 is connected to a concrete supply hose 30. As shown in FIG. 1, the concrete supply hose 30 includes:
Concrete flow meter 34 is connected and concrete flow meter 34 is connected.
A press ring drive control section 33 connected to the press ring jack 9 is connected to the flow meter 34 .

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. Furthermore, as shown in FIGS. 2 and 3, a formwork 13 assembled in an annular shape is attached to the gauge ring 11, as shown in FIGS.
Fig. 1) They are connected in the left and right direction.

Since the shield excavator 1 has the above configuration,
When excavating the tunnel 15, the cutter 3 is rotated by the drive morph 5, and the ram 6 of the excavation jack 6 is rotated.
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 of arrow A. Then, due to the pressing force, cutter 3 and face 1
6 are in contact with each other with a predetermined contact pressure, and the face 16 is in contact with the cutter 3)
At the same time, the outer shell 2 is propelled in the incoming direction so that the tunnel 15 is located at the rear of the shield excavator 1, that is, the first
It is formed on the right side of the figure.

In this way, as the tunnel 15 is formed, it is necessary to construct the lining 20 in order to prevent the excavated earth 19 from collapsing, but the construction of the lining 20 is carried out in the following steps. . That is, the shield excavator 1
When the excavation has been carried out in the A direction by the length Ll of the ring, the ram 6a of the excavation jack 6 is in the direction B as shown in FIG.
It is in a state of protruding in the direction, and the press ring 7
has also moved in the B direction.

In this state, as shown in FIG. 7, the ram 6a is moved back in the A direction by a distance L1. Then, the gauge ring 11 separates from the end stop 22A and formwork 13A 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 L1 between the formwork 13A and the gauge ring 11
A space is created. Therefore, as shown in the imaginary line in Figure 7, a reinforcing member made of iron plates, reinforcing bars, etc.
2 together with the end stop 22 via the engagement groove 11a,
Furthermore, the formwork 13. is in contact with the formwork 13A. Assemble and install the
The formwork 13, gauge ring 11 (end stop 228),
A concrete placement space 23 is formed between the press ring 7 and the 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 1/casting space 23 is performed smoothly.

After the concrete 21 has been cast in the concrete 1/casting space 23, the press ring jack 9 is now driven and the press ring 7 is placed as shown in FIG.
gradually retreat in direction A. Then press ring 7
After passing through, the outer shell 2 and the poured concrete 2
A space 26 is formed between the two. Therefore, as the press ring 7 moves in the A direction, concrete 21 is poured into the space 26 from the concrete discharge pipe 10 via the concrete supply hose 30, as shown in FIG.
The space 26 is filled with concrete 1-21. On this occasion,
The pressure of the concrete (21) filled in the space 26 is
The concrete flow meter 34 connected to the concrete supply hose 30 and the press ring drive control unit 33 are controlled so that the concrete 21 is always filled into the space 26 with a pressure within a certain range. .

That is, the concrete flow meter 34 measures the amount of concrete 21 supplied to the concrete supply pipe 10 and therefore the space 26 via the concrete supply hose 30, and outputs the measured amount to the press ring drive control section 33. Therefore, for example, the supply amount to the space 26 increases more than a predetermined value, and the pressure of the concrete 21 in the space 26 increases. 2
1A is caused by the pressure of the concrete 21 in the space 26.
9 side and there is a danger of disturbing the ground 19, the press ring drive control unit 33 uses a signal from the concrete flow meter 34 to control the concrete pressure in the space 26 to reach the specified maximum value. It is determined that there is a risk of exceeding
Immediately increase the moving speed of the press ring jack 9 in the A direction, and move the press ring 7 at a faster speed than before.
move in the direction. Then, the volume of the space 26 rapidly expands, so that even if more than a predetermined amount of concrete flows into the space 26, the pressure within the space 26 is maintained within the appropriate injection pressure range.

In addition, the flow rate of concrete 1-2 supplied from the concrete discharge pipe 10 decreases, and the
If there is a risk that a void will be created that will not be filled with concrete 21, the press ring drive control unit 33 will control the pressure in the space 26 to the specified minimum value due to a decrease in the concrete flow rate based on a signal from the concrete flow meter 34. Judging that there is a danger of the press ring being lower than Move in direction A at a slower speed than Then, the rate of expansion of the volume of the space 26 decreases compared to before, so the concrete 21 poured into the space 26
does not drop below a predetermined pressure and is maintained at an appropriate pressure state.

In this way, as the press ring 7 moves in the direction A and fills the space 26 with concrete 21 in an appropriate state,
As shown in FIG. 11, the side surface 7a of the press ring 7 reaches a position that substantially coincides with the installation position of the end stop 22 of the gauge ring 11.

Then, the filling operation of the concrete 21 into the space 26 is stopped, and as shown in FIG. 15 excavation operation is started.

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 press ring jack 9 is driven to gradually move the press ring 7 in the B direction in synchronization with the movement of the outer shell 2. Then, the unhardened concrete 21 in the previously filled space 26 is pressed by the press ring 7 and flows to fill the tail void 27. In this way, as shown in FIG. 13, when the press ring 7 is moved in the B direction as the outer shell 2 moves in the A direction, the tail void 27 generated as a result of the outer shell 2 movement can be effectively filled. It is being done. The press ring 7 is formed in an annular shape as a whole, and the pouring material such as the concrete 21 in the space 26 is controlled by the press ring drive control section 33 (
As a result, the concrete 21 is densely filled without creating any voids, and the concrete 21 is pressed with uniform pressure all around the ring, and the filling operation of the tail void 27 is uniform and in good condition over the entire circumference of the outer shell 2. It will be held in In this way, when the outer shell 2 is propelled by one ring, the press ring 7 has its side surface 7a aligned with the rear end of the outer shell 2, as shown in FIG. Construction is complete.

As the lining 20 is constructed as described above, the pouring surface 29 of the concrete 21 becomes as shown in FIG.
By the movement of the press ring 7, a step-like shape is formed.

(g) 0 Effects of the Invention As explained above, the present invention has an outer shell 2, a press ring 7 inside the outer shell 2, and a press ring jack in the direction of excavation of the outer shell. The press ring 7 is movably provided via a press ring driving means such as
a concrete discharge pipe 10 or the like for pouring a pouring material, and the pouring means is provided with a concrete flow meter 34 or other pouring amount measuring means for measuring the pouring amount of the pouring material such as a concrete IJ-h 21; Providing press ring movement control means such as a press ring drive control section 33 that controls movement of the press ring 7 via the press ring drive means according to the injection amount of the pouring material measured by the injection amount measurement means, Furthermore, a form support member such as a gauge ring 11 is provided inside the press ring 7 so as to be movable with respect to the outer shell 2, and
Since the formwork supporting member is provided with the excavation jack 6, the tail void 27 is effectively filled by the press ring 7, making it possible to construct a highly reliable tunnel lining. In addition, the pouring joint surface 29 of the pouring material in the lining 20
can be formed in a step-like manner, making it possible to construct a tunnel 15 with a large water-stopping effect.

Further, an injection amount measuring means for measuring the injection amount of the pouring material;
By providing a press ring movement control means, the space 2
It becomes possible to drive and control the press ring 7 while maintaining the pressure of the pouring material injected into the press ring 6 at an appropriate pressure.
The tail void 27 can be filled with a densely cast material without disturbing the ground 19, and the reliability of construction can be greatly improved.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view showing an 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.
Figure 4 is an enlarged view of the jacking part of the shield excavator; Figure 5 is a sectional view taken along line I-1 of Figure 4; Figures 6 to 1
FIG. 3 is a process diagram showing an example of constructing a lining using the shield excavator according to the present invention. 1...Shield excavator 2...Outer shell 6...Drilling jack 7...Press ring 9...Press ring drive means (press ring gear) 10... Means for pouring pouring material (concrete discharge pipe) 11... Form support member (gauge ring) 21...
... Pouring material (concrete) 33 ... Press ring movement control means (press ring drive control section) 34 ... Injection amount measuring means (concrete flowmeter) Applicant Mitsui Construction Co., Ltd. Agent Patent Attorney Phase 1) Shinji (and 2 others) -Lala n- Figure

Claims (1)

[Scope of Claims] It has an outer shell, a press ring is provided inside the outer shell so as to be movable in the excavation direction of the outer shell via a press ring driving means, and a casting material is applied to the press ring. An injection means is provided, and the injection means is provided with an injection amount measuring means for measuring the injection amount of the pouring material, and the press ring driving means is adjusted according to the injection amount of the pouring material measured by the injection amount measuring means. A press ring movement control means is provided for controlling the movement of the press ring through the press ring, and a form support member is provided inside the press ring so as to be movable with respect to the outer shell, and an excavation jack is provided on the form support member. A shield excavator configured with