JPH02112599A - Erector - Google Patents

Abstract

PURPOSE:To insert a key segment easily, and to prevent the sealing of a joint surface and the damage of segment itself by installing a pusher to a lifting beam and pushing the internal surface of the segment hung down in the radial direction. CONSTITUTION:Pushers 16, 16 mounted to a lifting beam 7 set up rotatably along the circumferential direction of a shield frame 1 and movably along the radial direction of the shield frame 1 in the shield frame 1. When a segment SC is inserted, the pushers 16, 16 are elongated, and the internal surfaces of B segments SB, SB hung down to the inside in the radial direction are pushed, and corrected to a correct state. A normal insertion space is ensured between the B segments SB, SB, and the key segment SC is inserted smoothly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an erector that is equipped with a shield and assembles segments to cover the inner wall of an excavated tunnel.

[Prior art] In general, a shield excavates a tunnel face using a cutting edge at its front end while being propelled by jack thrust, and segments are assembled to cover the inner wall of the excavated tunnel using an erector installed at the rear. ing.

As shown in FIG. 5, the erector 2 includes a shield frame 1
A hanging beam 7 is provided within the interior so as to be freely rotatable in the circumferential direction and movable in the radial direction, and the segment is supported by a hanging tool 12 attached to this hanging beam 7, and then transported to a desired location for installation. It is supposed to be done.

The above segments include a plurality of A segments SA whose circumferential end surfaces coincide with the normal line, a key segment SC which is inserted last, and a B segment whose one end surface is shaped so that the key segment SC can be easily inserted from the radial direction. It has a divided configuration consisting of SB.

[The problem that the invention tries to solve! ! ! ] However, in the above segment, the segments SA and 5BSC which are adjacent in the axial direction due to strength are arranged with their transfer sequentially shifted, and furthermore, the B segment SB is in a temporarily tightened state until the key segment SC is inserted.
Due to its arrangement, the segment SB will sag inward in the radial direction as shown by the imaginary line.
In addition to being difficult to insert, there were problems such as damaging the seal on the joint surface and damaging the segments SB and SC themselves.

Therefore, one object of the present invention is to solve the above-mentioned problems and to enable the key segment to be easily inserted into the insertion space between the B segments, thereby preventing damage to the seal on the joint surface or damage to the segment itself. The purpose is to provide an erector without

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a structure in which a segment is connected to a shield frame via a hanging beam provided in the shield frame so as to be rotatable along the circumferential direction of the shield frame and movable in the radial direction. In the erector, which is transported and assembled, a pusher is provided that is extendable and retractable radially outward to press the inner surface of the segment assembled on the hanging beam and correct the deformation of the lever.

[Operation] When inserting the key segment into the insertion space between the B segments, the pusher is expanded.

The B segments hanging radially inward are corrected to the correct state by having their inner surfaces pressed by the pusher, and a regular insertion space is secured between the B segments. Therefore, the key segment can be easily inserted into the insertion space between the B segments, and problems such as damaging the seal on the joint surface and damaging the segments themselves are eliminated.

[Embodiment] An embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a cylindrical shield frame, and an erector 2 for assembling segments is installed at the rear of the frame. This erector 2 has a ring frame 5 which is rotatably supported in the shield frame 1 via guide rollers 3 along its circumferential direction and is rotationally driven by a motor 4. An arm 6 is fixed at the opposite position so as to extend toward the shield frame lf&, and an arch-shaped hanging beam 7 is fixed to both ends of both arms 6, and a guide rod 8 is fixed to each arm 6.
The shield frame 1 is movably supported in the radial direction of the shield frame 1 via the shield frame 1. A jack 9 for moving the hanging beam 7 is interposed between the arm 6 and the guide rod 8.

The central portion of the hanging beam 7 is opened radially outward.

A hanging frame part 10 is provided, and a hanging tool 12 is slidably provided in the hanging frame part 10 via a guide bar 11 arranged in the axial direction of the shield frame 1.
A sliding jack 13 is connected to this hanging tool 12. The segments SA, SB, and SC are supported by connecting the hanging tool 12 and the eye bolts 14 inserted into the grout holes of the segments SA, SB, and SC. A support member 15 is attached to the suspension frame portion 10 to support the inner surface of the supported segment. Pushers 16 are provided on both sides of the suspension frame portion 10 of the suspension beam 7 to be extendable and retractable radially outwardly for pressing the inner surface of the assembled B segment itself and correcting its deformation. This pusher 16 is composed of a so-called cylinder sliding type jack, and specifically, as shown in FIG.
One end has a cylinder 18 slidably installed in the cylinder 18 and one piston slidably fitted in the cylinder 18, and the other end penetrates the end of the cylinder 18 in a fluid-tight manner to form a suspension beam 7. The piston rod 20 is fixed to the inner plate 7b of the piston rod 20. This pusher 16 is a piston 19
and an oil passage 21.2 formed in the piston rod 20.
The cylinder 18 expands and contracts by supplying pressure oil to the chambers 23, 24 in the cylinder 18 through the cylinder 2. A roller 25 is attached to the outer end of the cylinder 18 to support the inner surface of the B segment 3B.

Next, the operation of the embodiment will be described.

For example, when inserting the key segment SC into the insertion space S between the B segments SB formed in the upper part of the shield frame 1 as shown in FIG. 14 is engaged with the hanging tool 12 of the hanging beam 7 for pin connection, and then the ring frame 5 is turned half way 5 to position the key segment SC directly below the insertion space S as shown in FIG.

Therefore, the pusher 16 is extended, and the roller 15 at the tip is brought into contact with the inner surface of the B segment SB to press it radially outward. This causes B to hang radially inward.
Segment SB is corrected to the normal position, and a normal insertion space S is secured between B segments SB. Therefore, by moving the suspension beam 7 radially outward, the key segment SC can be easily inserted into the insertion space S between the B segments SB, which may damage the seal on the joint surface or damage the segment itself. Problems such as this will be resolved. At this time, in order to prevent the pusher 16 that moves together with the suspension beam 7 from exerting an excessive pressing force on the B segment SB, it is synchronized with the movement jack 9 of the suspension beam 7.

to retract the pusher 16, or set the pressure of the relief valve for the pusher 16 to EM, and then automatically retract the pusher 16.
6 may be contracted.

In the embodiment, a so-called cylinder sliding type jack is used as the pusher 16, but it may be a normal jack whose piston rod side expands and contracts.

Furthermore, although the pusher 16 is configured to expand and contract in the same direction as the moving direction of the hanging beam 7, it may also be configured to expand and contract in the normal direction of the segment. Further, although the outer end of the pusher 16 is fitted with a roller 15 which supports the inner surface of the segment, it may be provided with a suitable member of the pond, or may be provided with no material at all.

[Effects of the Invention] In summary, according to the present invention, when inserting the key segment into the insertion space between the B safeters 25, by extending the pusher and pressing the inner surface of the B segment hanging radially inward. Correct the condition and secure a regular insertion space between the B-sefters 25. Therefore, the key segment can be easily inserted into the insertion space between the B-sefters 25, and the seal on the joint surface can be secured. It is possible to eliminate problems such as injury or damage to the segment itself.

[Brief explanation of the drawing]

Fig. 1 is a front view of an erector showing an embodiment of the present invention, Fig. 2 is a sectional view taken along the line A-A in Fig. 1, Fig. 3 is an enlarged sectional view of the pusher, and Fig. 4 shows the working situation. The explanatory diagram, FIG. 5, is a front view of a conventional erector. In the figure, 1 is a shield frame, 2 is an erector, 7 is a hanging beam, 16 is a pusher, SA, SB. SC is a segment. Figure 2

Claims (1)

[Claims] 1. In an erector that transports and assembles segments via a hanging beam provided in the shield frame so as to be able to turn freely along the circumferential direction and to move freely in the radial direction, the inner surface of the segment assembled on the hanging beam is An erector characterized in that a pusher that presses and corrects deformation is provided in a radially outwardly expandable and retractable manner.