JPS6349039B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an open shield excavator, which is an excavator with an open top surface.

[Prior art and its problems]

For single-unit or split-type excavators used in open construction methods such as the conventional open shield construction method, open propulsion construction method, open traction construction method, and open self-propelled advance construction method, the length of the propulsion machine must be adjusted to allow it to move forward using a propulsion jack. becomes longer, making it difficult to correct the direction.
The disadvantage is that it cannot be used to construct sharp curves.

By the way, Utility Model No. 63904 (1983)
No. 137804) shows an open shield tunneling machine that is divided into three sections, the front section, the first tail section, and the second tail section, to ensure smooth curve propulsion, but in this example, each section is operated by a hydraulic jack. interconnected. In this case, as mentioned above, the length of the entire excavator remains long, and since there are many divisions, the number of propulsion jacks also increases, and the forwarding process requires quite complicated work.

The purpose of the present invention is to eliminate the disadvantages of the conventional example,
To provide an open shield excavator that simplifies the number of parts and work procedures by using two divided bodies, particularly allows the tail excavator to be shortened among the divided bodies, and also prevents collapse of lateral earth and sand at the rear of the excavator. be.

[Means for solving problems]

In order to achieve the above object, the present invention includes a front excavator having an opening at the upper part and a tail excavator that are slidably fitted together, and the front excavator is provided with a jacking advance facility toward the rear. , the gist is that a connecting member, a traction device consisting of a removable fixing device and a traction jack device are installed between the two tunneling machines, and the upper part of the side plate of the tail tunneling machine is extended rearward. .

[Effect]

According to the present invention, the tail excavator moves forward by being towed, and the tail excavator only needs to be shorter than the case where it is pushed out by a propulsion jack, and can sufficiently cope with bending. Furthermore, although the tail tunneling machine is short as a whole, its upper side plate is extended rearward, and this part prevents the lateral earth and sand from collapsing at the rear of the tunneling machine. In addition, because of this extended portion, even if the backfilled and covered earth and sand enters the inside of the excavator, the angle of repose will be maintained, and the earth and sand will not penetrate deeply into the excavator.

〔Example〕

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

FIG. 1 is a side view showing a first embodiment of the open shield excavator of the present invention, and FIG. 2 is a front view of the same.
The excavator 2, which is to be advanced underground and has an open top, is divided into two parts, a front excavator ₂₁ and a tail excavator ₂₂ , each having a _shorter length.
2 ₂ are slidably fitted together, and the front excavator 2 ₁ is provided with a jack advance device 6 for forward movement toward the rear, and a steel wire is installed between the front excavator 2 ₁ and the tail excavator 2 ₂ . Connecting member 8 for forward movement by etc.
, a cone-type fixing device 9 that is removably fixed to the connecting member 8, and a center-hole type connecting member 8.
A towing facility consisting of a towing jack facility 7 for towing the connecting member 8 via a conventional fixing device 9 was provided. Then, the upper side plate 3 ₁ of the tail tunneling machine 2 ₂ is extended rearward to form an extended portion 3 ₂ .

Furthermore, as another embodiment, as shown in _FIG .
Between ₂ and 3 ₂ , an earth retaining arrangement 11 is provided, which is separate and movable from the excavator 2, and also integrally with the excavator 2. This earth retaining equipment 11
is like a partition wall, and if it is separate and movable, it can be fixed to the extension part ₃₂ at any desired position with bolts; if it is integral, it can be welded.

Next, how to use and operate the front excavator 2 ₁ is advanced. As shown in FIG.
Using the underground structure 1 in ₂ as a reaction force, the jack advance equipment 6 is operated to advance the front excavator.
When a direction correction is necessary, the vertical and horizontal direction adjustment is performed by adjusting the vertical and horizontal jack forwarding equipment 6.

The method for advancing the tail excavator 2 ₂ is to fix the fixing device 9 to the connecting member 8 and operate the traction jack equipment 7 to move the tail excavator 2 ₂ forward by towing it. The forward reaction force at this time uses both the group of underground structures 1 following the tail excavator 2 ₂ via the jack advance equipment 6 and the front excavator 2 ₁ as a reaction force. Further, the vertical and horizontal directions of the tail excavator ₂₂ are corrected by operating the vertical and horizontal traction jack equipment 7.

The method for removing earth and sand from the face is as shown in Fig _.
Discharge soil from the opening on the top.

The arrangement of the underground structure 1 inside the tail excavator 2 ₂ is as follows:
Although not shown, the underground structure 1 suspended and set within the starting base is propelled into the ground by a jack or the like and advanced into the tail excavator ₂₂ .

Further, backfilling soil 23 is applied on the underground structure 1 as appropriate.

In this case, the extension portion 3 ₂ of the upper side plate 3 ₁ of the tail excavator _{2 2} prevents the lateral earth and sand from collapsing at the rear of the excavator, and the front end portion of the earth and sand that has been used as the backfill cover soil 23 is the extension portion 3 ₂ . Because of the angle of repose, it does not enter the tail excavator 2 ₂ and slump significantly.

Furthermore, if there is earth retaining equipment 11, this prevents the earth and sand covered with backfilling soil 23 from entering into the excavator 2.

Thereafter, as described above, the front excavator is advanced, the tail excavator is advanced, the face earth is removed, and the underground structure is advanced by repeating the steps to advance the excavator into the ground.

Further, although not shown in the drawings, the earth removal method may be performed by using the clam shell 22 as described above, or by using screw auger equipment _.
A partition wall may be provided inside and the earth may be discharged behind this partition wall using screw auger equipment. moreover,
Front excavator 2 A stirring shaft that penetrates the bulkhead installed in ₁ is equipped with a stirring blade at the front and a stirrer at the rear. The earth may be removed or removed using a sand pump, etc.

On the other hand, the underground structures to be installed inside the tail excavator 2 ₂ shall be constructed by assembling underground structures such as shoring and segments that are assembled one after another inside the tail excavator 2 ₂ , or It may also be a suspended set-type underground structure that is suspended from the ground within the tail excavator ₂₂ .

〔Effect of the invention〕

As described above, the open shield excavator of the present invention divides the excavator with an open top to advance into the ground, shortens the length of each excavator, and facilitates vertical and horizontal direction correction. Since no jacking equipment is provided in the tail tunneling machine, the length of the tail tunneling machine can be shortened by the length of the jacking and its stroke length, which has the advantage of facilitating direction correction.

Furthermore, the earth and sand from the face can be removed onto the top surface of the front excavator using an excavator on the ground, making it easy to remove the earth, shorten the construction period, and be economical. Further, by dividing the tunneling machine into short sections in the front and back and moving it forward, the advancement equipment for each tunneling machine can be small, which is economical, and there is no need for huge forward reaction force equipment, which is even more economical.

In addition, the length of the tail excavator is shortened as a whole to make it easier to perform movements such as curves, and an extension part is formed at the rear of the tail excavator.
This can be done to prevent the intrusion of backfilling earth and sand and the collapse of lateral earth and sand at the rear of the excavator.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the open shield excavator of the present invention, FIG. 2 is a front view of the same, and FIG. 3 is a side view showing another embodiment of the same. DESCRIPTION OF SYMBOLS 1... Underground structure, 2... Excavation machine, 2 ₁ ... Front excavation machine, 2 ₂ ... Tail excavation machine, 3 ₁ ... Upper side plate, 3
₂ ... Extension part, 6... Jacket advancement equipment, 7... Traction type jacking equipment, 8... Connecting member, 9... Fixing tool, 1
1...Earth retaining equipment, 22...Cram shell, 23...Backfilling and covering.

Claims (1)

[Claims] 1 A front tunneling machine and a tail tunneling machine having an opening at the top are slidably fitted together, and the front tunneling machine is provided with a jack advance device facing rearward, and a connecting member and a connecting member are installed between the two tunneling machines. An open shield excavator characterized in that a traction device consisting of a detachable fixing device and a traction jack device is disposed on a connecting member, and the upper side plate of the tail excavator is extended rearward.