JPH04126995U - Buckling prevention device for shield tunneling machines - Google Patents

Abstract

(57) [Summary] [Purpose] The objective is to prevent the shield body from buckling due to incorrect selection of the shield jack to be retracted. [Structure] In a shield excavation machine that excavates a tunnel by propelling the shield body 1 underground by a plurality of shield jacks 2 ₁ to 2 ₈ provided along the inner circumference of the shield body 1, each of the above-mentioned shield jacks 2 ₁ is used. or 2 Divide ₈ into multiple groups and set a contraction operation pattern for each group,
In addition, each shield jack 2 ₁ to 2 ₈ is retracted according to these retraction operation patterns, and when the above retraction pattern is selected, if a shield jack 2 ₁ to 2 ₈ that does not correspond to the retraction operation pattern is selected, the interlock circuit causes the shield jack 2 to be retracted. ₁ to 2 ₈ are made so that they cannot be retracted, which prevents the shield body from buckling even if the wrong shield jack is selected to retract.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea is based on the shield excavator's barrier that prevents the shield body from buckling. This invention relates to a locking prevention device.

0002

[Conventional technology]

Conventional shield excavators that excavate tunnels have multiple tunnels in the circumferential direction of the shield body. It has a shield jack, and these shield jacks can be used to remove the shield body. It is designed to dig tunnels by propelling it forward.

0003 In addition, each shield jack extends to the end of its stroke, allowing one pitch of excavation. When finished, the shield jacks are sequentially retracted to assemble the segments. If you incorrectly operate the shield jack, which retracts when This can cause so-called buckling, where the shield body retreats, damaging the tail seal. do. For this reason, in the past, the hydraulic circuit of the shield jack was divided into multiple systems, and each system was Install a detector on each shield jack, or install a pressure sensor on each shield jack. Prevents buckling from occurring in the shield body by detecting contraction of the key are doing.

0004

[Problem that the idea aims to solve]

However, as in the past, the hydraulic circuit of the shield jack is made into multiple systems, and each In the method of installing a pressure detector for each electric jack, the circuit becomes complicated and the equipment itself becomes expensive. In addition to being expensive, they also have problems such as requiring a lot of space to install. It was. This idea was made to improve the above-mentioned conventional problems, and it is a simple device. Buckling of the shield excavator that prevents buckling of the shield body The purpose of this invention is to provide a device for preventing

[0005]

[Problem that the idea aims to solve]

In order to achieve the above purpose, this idea consists of multiple Excavate a tunnel by propelling the shield body underground using several shield jacks. In a shield excavator that uses Set a contraction operation pattern for each, and each seal according to these contraction operation patterns. When retracting the door jack and selecting the retracting pattern above, the retracting operation pattern If a shield jack that does not hit is selected, the shield jack will be This prevents the jack from collapsing.

[0006]

[Effect]

With the above configuration, mistakes in selecting the shrinking shield jack will not occur, so Buckling on the shield body prevents segment assembly from becoming impossible. You will be able to do this.

[0007]

【Example】

An embodiment of this invention will be described in detail with reference to the drawings. FIG. 1 is a layout diagram of a shield jack disposed within the shield body, FIG. 2 is a hydraulic circuit diagram of the shield jack, and FIG. 3 is a circuit diagram showing an electrical interlock circuit. In Fig. 1, reference numeral 1 denotes a shield body, and a plurality of shield jacks ₂₁ to ₂₈ , for example, _eight shield jacks, are arranged _at equal intervals along the inner circumferential surface of the shield body. is being propelled underground.

In addition, 3 in FIG. 2 is a hydraulic pump that supplies hydraulic pressure to the shield jacks 2 ₁ to 2 ₈ . After the discharge pressure of this hydraulic pump 3 is regulated by a relief valve 4 , it is switched to a pipe by a main switching valve 5 . It is supplied to the rod chamber 2a side of each of the shield jacks 2 ₁ to 2 ₈ through a pipe ₆ , and to the bottom chamber 2b through a pipe 7 connected to the bottom chamber 2b of each shield jack 2 1 to 2 ₈ . In addition, a solenoid valve 8 is installed in the middle of the pipe line 7 connected to the bottom chamber 2b side of each of the shield jacks 2 ₁ to 2 ₈ .

[0009] In addition, there is a solenoid valve in the middle of the pipe 6 connecting between the main switching valve 5 and each solenoid valve 8. A check valve 10 and a relief valve 11, which flow only from 8 to the tank 9 side, are provided in the middle. A return pipe 12 is connected thereto.

On the other hand, the eight shield jacks 2 ₁ to 2 ₈ have four selection patterns, for example, top, bottom, left, and right when they are retracted. That is, the right pattern is composed of four shield jacks 2 ₁ , 2 ₂ , 2 ₃ , and 2 ₄ , and the left pattern is composed of shield jacks 2 ₅ , 2 ₆ , 2 ₇ , and 2 ₈ . Furthermore, the upper pattern is composed of shield jacks 2 ₁ , 2 ₂ , 2 ₇ , and 2 ₈ , and the lower pattern is composed of shield jacks 2 ₃ , 2 ₄ , 2 ₅ , and 2 ₆ .

[0011]The interlock circuit shown in FIG. 3 is configured by switch groups _S1 to _S8 provided for each shield jack ₂₁ to ₂₈ , and a signal is output to the output terminal 14 of this interlock circuit. The shield jacks 2 ₁ to 2 ₈ can be retracted when the

Next, to explain the operation, by simultaneously opening the solenoid valves 8 provided in the pipes 7 connected to the bottom chamber 2b side of each of the shield jacks 2 ₁ to 2 ₈ , the discharge pressure of the hydraulic pump 3 is increased. is supplied from the main switching valve 5 through the conduit 7 to the bottom chamber 2b side of each of the shield jacks 2 ₁ to 2 ₈ , thereby extending each of the shield jacks 2 ₁ to 2 ₈ and propelling the shield body 1 . Further, during excavation, the propulsion pressure is maintained by the relief valve 11 provided in the return pipe 12, and buckling of the shield body 1 is prevented.

When the shield jacks 2 ₁ to 2 ₈ extend to the stroke end and excavation for one pitch is completed, a portion of the shield jacks 2 ₁ to 2 ₈ is retracted to assemble the segments. If the shrinking shield jacks ₂₁ to ₂₈ are selected incorrectly, buckling will occur in the shield body 1 and the tail seal will be damaged.

[0014] Therefore, in this invention, buckling of the shield body 1 is prevented by the following method. stomach Shield jack 2 to assemble the segment.₃,2_Four,2_Fiveto contract In this case, it becomes the lower pattern of the jack selection pattern. With this, shield jack 2₃,2_Four,2_FiveSwitch S corresponding to₃,S _Four ,S_Fiveis turned on, but at this time, shield jack 2 other than the lower pattern₁,2 ₂ ,2₇,2₈If even one of these shield jacks is selected incorrectly, these two shield jacks₁， 2₂,2₇,2₈Switch S corresponding to₁,S₂,S₇,S₈is turned on. Since the normally closed contacts of these switches are turned off, a contraction occurs at the output terminal 14 of the interlock circuit. No signal is output and shield jack 2₃,2_Four,2_Five,2₆can't contract stomach.

[0015] Therefore, by confirming the selection of the shield jacks 2 ₁ to 2 ₈ to be contracted again, _buckling of the shield body 1 due to incorrect selection of the shield jacks 2 1 to 2 ₈ can be prevented. Similarly, even if you select the left pattern to contract the shield jacks 2 ₆ and 2 ₇ , if one of the shield jacks 2 ₁ , 2 ₂ , 2 ₃ , and 2 ₄ is selected by mistake, the interface Since the retractable signal is not output from the lock circuit, the shield jacks 2 ₆ and 2 ₇ cannot be retracted, and when returning the shield jacks 2 ₁ and 2 ₂ , the shield jacks in the right pattern or the upper pattern must be selected. It is possible to operate only

[0016] In the above example, there are four operation patterns: right, left, top, and bottom. It is not limited to. Furthermore, it goes without saying that the interlock circuit also changes as the operation pattern changes.

[0017]

[Effect of the idea]

As detailed above, this idea consists of multiple shield jackets that propel the shield body. Divide the system into multiple contraction operation patterns, and If a shielded jack is selected by mistake, an interlock circuit will prevent the shielding Since the jack was prevented from retracting, it was possible to accidentally use it for the intended purpose during segment assembly. No other shield jacks will be deflated. This prevents the shield body from buckling, so the segment Improved operability by allowing smooth assembly and eliminating operational errors. You will also be able to plan. In addition, since it is only necessary to provide a simple interlock circuit, it is easy and inexpensive to implement. It can be installed easily and requires almost no space for installation. It can be adopted regardless of the diameter of the field excavator.

[Brief explanation of drawings]

FIG. 1 is an arrangement diagram showing the arrangement of a shield jack of a shield excavator according to an embodiment of the invention.

FIG. 2 is a hydraulic circuit diagram of the shield jack.

FIG. 3 is a circuit diagram of an interlock circuit.

[Explanation of symbols]

1 Shield body 2 ₁ Shield jack 2 ₂ Shield jack 2 ₃ Shield jack 2 ₄ Shield jack 2 ₅ Shield jack 2 ₆ Shield jack 2 ₇ Shield jack 2 ₈ Shield jack

Claims (1)

[Scope of utility model registration request] Claim 1: In a shield excavator that excavates a tunnel by propelling the shield body 1 underground by a plurality of shield jacks 2 ₁ to 2 ₈ provided along the inner circumference of the shield body 1, each of the shield jacks 2 ₁ or 2
₈ is divided into a plurality of groups and a contraction operation pattern is set for each group, and each shield jack 2 ₁ to 2 ₈ is retracted according to these contraction operation patterns, and when the above contraction pattern is selected, the shield jack 2 that does not correspond to the contraction operation pattern A buckling prevention device for a shield jack excavator, which prevents shield jacks 2 ₁ to 2 ₈ from being retracted by an interlock circuit when ₁ to 2 ₈ are selected.