JPS6080697A - Width enlarging shield drilling method and apparatus - 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 [Technical field to which the invention pertains] The present invention relates to a seal 1 excavation construction method and an apparatus therefor, which can appropriately provide a widening section in the middle of a tunnel.

[Prior art and its problems]

In the case of installing a 101 voltage wire, the joint part of the cable has a larger cross section than the other parts, so the part where the joint parts are concentrated needs to be formed as a widened part in order to secure space.

As a construction method for such widening sections, building a shaft from the ground is often restricted by road conditions and the work environment, and it is time-consuming because the shaft must be filled in.

Therefore, it is possible to take advantage of the advantages of the seal construction method. For example, after constructing a tunnel using the Sault-E method, there is a method of widening it by hand digging or other excavation methods without removing the segment ring of the 11 m area that should be widened. Earth retention at the excavated area is a problem, and a method of installing an over cutter on the excavation machine and creating the widened section all at once is being considered, but it is difficult to reduce the propulsion force of the excavation machine in the widened area. The question is how to obtain it.

[Purpose of the invention]

The purpose of the present invention is to take into consideration the above-mentioned circumstances. - At the same time, a widening section is formed, and the time required for the ground to be opened after excavation is minimized to reduce the risk of ground collapse, and a special structure is constructed (to obtain the propulsion force of the excavation machine). An object of the present invention is to provide a shield excavation method for widening and a device thereof.

[Key points of the invention]

However, according to the present invention, the cutter wheel portion is provided with an overcuck that can protrude toward the outer periphery and a window hole formed in a door that opens and closes a part of the skin plate.
'', using a tunnel excavator equipped with a large segment 1 - erector for assembly that can come out and go out from the window hole, excavate one link of the cut and widened part with the overcuckoo, and excavate this part. Assemble the large segment with the front erector, then assemble the rear segment of normal diameter, use this as a reaction force to move the excavator forward, and repeat the same process again to assemble the double segment of large size and full diameter. This is achieved by removing only the inner normal diameter segment after assembly.

[Embodiments of the invention]

Embodiments of the present invention will be described in detail below with reference to the drawings.

First, the device of the present invention will be explained first. Fig. 1 is a front view showing an embodiment of the device of the present invention, Fig. 2 is a side view of the same, and Fig. 3 is a sectional view taken along the line A-A in Fig. In the figure, 1 is a normal cutter face of a shield tunneling machine, 2 is a cutter wheel having the face 1, and 3 is the main body of the tunneling machine, which is a non-rotating part that takes the cutter wheel 2, which is a so-called mechanical shield. As is well known in the art, the cutter face 1 and canter wheel 2 are installed in the excavator main body 3 by a shaft or drum structure, and are rotated by a drive device such as a motor, and the earth and sand scraped by the cutter bit is removed from the face 1. It is taken into the main body 3 through the slit and carried out to the rear,
In addition, segments are assembled using a segment erector (not shown) installed at the rear, and the segments are propelled by a shield jack using the reaction force.

The canter wheel 2 is provided with an over cutter 4 that can protrude in the circumferential direction using a hydraulic jack and a bushing rod, a cutter rod, etc. connected thereto, and on the other hand, a part of the lower skin plate 2a of the cutter wheel 2 is Door body 6, 6 that is hinged with the end and pin 5 and opens into a double door.
A two-stage glossy plate 7° and 7° for opening and closing connected to each door body 6, 6′ was fixed inside the skin plate 2a.

In the drawings, FIGS. 4 and 5 are a longitudinal side view and a rear view showing details of the connection of the door bodies 6, 6'.

Furthermore, a front segment erector 9 is provided so as to be able to protrude from a window hole 8 formed at the door body 6, 6°. The erector 9 is indirectly fixed to a drive unit 10 consisting of a rotating shaft and a motor, and is assembled into a large segment.

Next, the construction method of the present invention using the shield excavation device as described above will be explained.

Figures 6 to 8 are side views showing the second stage of carrying out the construction method of the present invention - First, as shown in Figure 6, in order to excavate a normal cross section, the overcutter 4 is housed in the cutter wheel 2. In addition, the door bodies 6 and 6' are also closed, and segments 11 of normal diameter are sequentially assembled at the rear by an erector 15 (not shown), and the shield jack is activated by using the segments 11 as a reaction force. The machine extends and moves forward.

When entering the cutting and widening section, as shown in FIG. 7, the overcutter 4 is hydraulically pushed out and rotated together with the cutter wheel 2 to excavate to a specified cross-sectional diameter and length.

When one ring of the cutting and spreading section has been excavated, extend the jack 7.7" to open the door body 6,6° as shown in Fig. 8, and protrude the front erector 9 from the window hole 8. Assemble the large segment 12. In this case, the erector 9 is fixed to the drive unit 10, and rotates forward and reverse together with it to assemble the segment 1-12. However, the erector 9
The front, rear, top, and 1.'' operate independently regardless of the drive unit 10.

After assembling the iiJ segment 12, the erector
9 inside, and after closing the door bodies 6 and 6' (assemble the IP upper segment 1 and use this as a reaction force to move forward;

After assembling the rear segment l-11, as shown in Fig. 9, the overcutter 4 is pushed out again to excavate the cutting and expanding portion, and when the cutting and expanding portion of the second ring is completed, the door bodies 6, 6 are removed.
Open ° and assemble the second ring large segment 12.

In this case, a shield pedestal 13 made of steel is placed between the ring segment and the shield machine to support the shield machine and maintain the horizontal level.

The steps shown in FIGS. 6 to 9 are repeated sequentially to construct a desired widened section. In this widened section, as shown in FIG. 10, the outer large segment 12 and the inner normal segment The segments 11 are assembled in duplicate, and the inner normal segment 11 can be removed later. The segment 11 located in this widened part is used only to obtain the reaction force for IF advancement, so there is no need for a seal etc., while the salt pedestal 13 may be disassembled and removed. .

〔Effect of the invention〕

As described above, the widening seal l: excavation method and its equipment of the present invention save time and labor by excavating the widening section all at once, eliminate the time for opening the ground after excavation, and eliminate the risk of ``ζ collapse''. It is also the same as the normal part without adding any special structure (it can obtain the propulsive force of the excavator and reduce costs).

[Brief explanation of drawings]

Fig. 1 is a front view showing an embodiment of the seal 1-excavation device of the present invention, Fig. 2 is a side view of the same, and Fig. 3 is 8-A of Fig. 2.
4 is a vertical sectional side view showing details of the door body, 5 is a rear view of the same, 6 to 9 are side views showing each process of the method of the present invention, and 10 is a side view showing details of the door body. It is a perspective view of the constructed widened part. l... Cutter face 2... Force, tarwheel 2a ・Skin play 1, 3... Excavation machine body 4...
Over cutter pin 6.6” door body 7
．． 7'...Ja, key 8...Window hole 9...Front erector 10...Drive section 11. 12...Segment 1-13...Shield pedestal applicant Hfy Island Construction Co., Ltd. Condolences 1? ,・21λ1.

Claims (2)

[Claims] (1) Using a seal I excavator equipped with a 11-sided overcuckoo that can protrude to the outer circumference of the tip and a front erector for introducing the J segment, the overcuckoo covers one link of the incision and expansion part. , assemble a large segment with the front erector, then assemble the rear segment of normal diameter, use this as a reaction force to move the excavator forward, repeat the same process again, and assemble the large and normal diameter segment. 2
Shield excavation method for widening -1-, characterized by removing only the inner normal diameter segment after assembling the heavy segment 1- in the widening section. (2) Segment machining 1 at the rear with a canter wheel at the tip
In the excavator, an overcutter capable of protruding outward in the 1M direction and a window hole formed in the opening/closing door of a part of the skin plate are provided in the force notar poile portion, and A shield excavation device for widening which is characterized by having an erector for assembling large segments that can appear and retract.