JP2902453B2 - Shield machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a shield excavator provided with a shoring device for safely performing cutter bit replacement.

[Conventional technology]

As the construction distance of the tunnel construction is increased and the construction depth is increased, the chance of changing cutter bits during the construction is increasing.

Conventionally, when replacing a cutter bit during construction, the chemical solution is injected from the shield machine or from the ground to strengthen the ground,
Water was stopped, the face was self-supporting, and a shoring was provided with the equipment that was carried in to prevent collapse of the ground and ensure the safety of workers who exchange bits in the face or chamber.

FIG. 5 shows an example of a conventional method of retaining a mountain by carrying in equipment. In the figure, 1 is a shield machine,
A rotating cutter head 3 is provided at the front of the shield body 2, and a chamber 5 for taking in excavated earth and sand is provided between the cutter head 3 and a bulkhead 4 behind. The shield machine is provided with excavating equipment such as a cutter driving device 6, a shield jack 7, an erecta 8, and a screw conveyor 9 for unloading, and a cutter bit 10 attached to the outer peripheral portion of the cutter head 3 and the cut-spoke 3a. To propell while excavating the face 11.

At the time of replacing the cutter bit, after the face is made independent by injecting a chemical solution, earth removal and first excavation in the chamber 5 are performed to secure a working space 18 between the cutter head 3 and the face 11.
A shoring 19 is provided by the equipment carried in here, and the cutting bit 10 is replaced after the cutting face is fastened.

[Problems to be solved by the invention]

Due to the increase in the ground hardness due to the increase in the construction distance and the depth of the construction, the replacement work of the cutter bit is performed only once.In many cases, the replacement work is performed several times. With the method of retaining the mountain,
It took a lot of time to carry in the equipment such as shoring before the replacement work, to carry out the equipment after the completion of the replacement work, and to set up and clear up the equipment.

In view of the above points, the present invention quickly and surely presses the face without needing to carry in equipment such as shoring when replacing the cutter bit, ensuring the safety of the replacement worker, and greatly reducing the time required for the mounting work. It is an object of the present invention to provide a shield excavator equipped with a mountain retaining device, which can perform the above operation.

[Means for solving the problem]

In order to achieve the above object, the present invention provides a shield machine in which a cutter head is provided at a front portion of a shield body, and a chamber for excavating sediment is provided between the cutter head and a rear bulkhead. A mounting device for holding the cutting face at the time of cutter bit replacement is mounted on the bulkhead together with a driving means for advancing and retreating, so that it can be advanced to the face side through the opening of the cutter head or retracted into the chamber, And at the time of normal excavation,
It is characterized in that the front surface of the mountain retaining device can be retracted to a position substantially the same as the side wall surface of the chamber of the bulkhead.

[Action]

The mountain retaining device is normally retracted into the chamber during excavation and holds the face by advancing to the face side through the opening of the cutter head only when replacing the cutter bit,
Prevent the collapse of the ground.

During normal excavation, the flow of the earth and sand in the chamber can be prevented by retreating the front surface of the retaining device to almost the same position as the side wall surface of the chamber of the bulkhead.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a side cross-sectional view of a shield machine equipped with a retaining device according to one embodiment of the present invention, FIG. 2 is a view taken along the line AA of FIG. 1, and FIG. FIG. 4 is a partially detailed view showing the state, and FIG. 4 is a partially detailed view showing the state when the retaining device is retracted. In FIGS. 1 to 4, reference numerals 1 to 11 indicate the same or corresponding parts as in FIG. 5, and the description thereof will be omitted.

In the present embodiment, two upper portions of a bulkhead 4 that separates the chamber 5 of the shield machine 1 from the interior of the machine are provided with flattening devices 12 having flat front surfaces. 4 is attached to the head side of a hydraulic jack 13 that slides back and forth. The hydraulic jack 13 is provided as a driving means for moving the retaining device 12 forward and backward. The hydraulic jack 13 is required for a stroke sufficient to advance the retaining device 12 from the chamber side wall surface of the bulkhead 4 to the face surface, and for holding down the face surface. The rod end 14 is connected to the bracket 15 of the shield body 2.

In the shield machine of the present invention configured as described above, when replacing the cutter bit 10, strengthening the ground by injecting a chemical solution from within the shield machine or from the ground in advance, stopping water,
The face is self-sustained, and then the earth is removed from the chamber 5 and excavated to secure a work space 17 necessary for bit replacement. After that, the hydraulic jack 13 is extended with the bracket 15 as a reaction force receiving member, and the mounting device 12 is mounted. By moving the cutter bit 11 forward through the cutter head opening between the cutter spokes 3a to the face side, as shown in FIGS. The replacement work can be performed safely.

When the bit exchange around one spoke is completed, the fastening device 12 is pulled back into the chamber 5 once, the cutter head 3 is rotated by the distance between the spokes, and then the fastening device again.
By repeating the operation of moving the 12 forward, bit exchange around each spoke is performed sequentially.

After the completion of the bit replacement operation, the hydraulic jack 13 is contracted to retract the retaining device 12 in the chamber 5, and the excavation is resumed.
A recess 4a (see FIG. 3) is provided on the side wall surface of the chamber of the bulkhead 4 for receiving the bucking device 12, and the front surface of the bucking device 12 is moved to substantially the same position as the chamber side wall surface of the bulkhead 4 as shown in FIG. If it is made to retreat, the flow of the earth and sand in the chamber 5 will not be hindered by the retaining device 12 during normal excavation.

A sediment seal 16 is provided in a portion of the bulkhead 4 through which the hydraulic jack 13 penetrates to prevent intrusion of sediment and groundwater into the machine.

〔The invention's effect〕

According to the present invention, at the time of cutter bit replacement, a face retaining device can be attached to the bulkhead portion of the shield machine by means of the retaining device, so that the work for carrying in the retaining device at the time of replacing the cutter bit and the carrying out of the device after the completion of the replacement operation can be performed. In addition to eliminating the need for work, the time required for the work of setting up the buckle can be greatly reduced, and the construction period can be shortened. In addition, the shield body can be securely secured as a reaction force receiving member, and the safety is high.

Also, during normal excavation, the front surface of the retaining device can be made substantially the same as the chamber side wall surface of the bulkhead, so that the flow of earth and sand in the chamber is not hindered.

[Brief description of the drawings]

FIG. 1 is a side cross-sectional view of a shield machine equipped with a retaining device according to one embodiment of the present invention, FIG. 2 is a view taken along the line AA of FIG. 1, and FIG. FIG. 4 is a partial detailed view showing the state when the retaining device is retracted, and FIG. 5 is an explanatory diagram of a conventional retaining method by carrying in equipment when replacing the cutter bit. DESCRIPTION OF SYMBOLS 1 ... Shield excavator, 2 ... Shield body, 3 ... Cutter head, 3a ... Cutus spoke, 4 ... Bulk head, 4a ... Recess of bulk head 4, 5 ... Chamber, 10
…… Cutter bit, 11 …… face, 12 …… Fastening device, 13
…… Hydraulic jacks that are driving means of the retaining device 12.

Claims (1)

(57) [Claims] A shield excavator provided with a rotating cutter head at a front portion of a shield body and having a chamber for taking in excavated earth and sand between the cutter head and a rear bulk head. In order to be able to advance the cutting device to the cutting face side through the opening of the cutter head or to retract the chamber into the chamber, the mounting device for holding down is mounted on the bulkhead together with the driving means for advancing and retreating, and during normal excavation, A shield excavator wherein a front surface of the mountain retaining device can be retracted to a position substantially the same as a chamber side wall surface of a bulkhead.