JPH0689627B2 - Shield machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a shield machine that can be handled by a single shield machine from a shaft to a shaft.

<Prior Art> Generally, in order to construct a shield tunnel, after constructing a vertical shaft having a size capable of suspending a shield machine, the shield machine is suspended in the vertical shaft and the tunnel is sequentially covered while excavating in a lateral direction. I am working. As the vertical shaft (starting vertical shaft, reaching vertical shaft), underground continuous walls, column-row continuous walls, caisson, etc. are used.

<Problems to be Solved by the Present Invention> The conventional construction technology described above has the following problems.

<a> The equipment and equipment used during tunnel excavation when constructing a shaft differs.

Therefore, many kinds of equipment and facilities are required.

<B> In order to suspend the shield machine, the opening diameter of the shaft must be larger than the entire length of the shield machine.

<C> When the shield machine is started, it is necessary to destroy the side wall of the shaft over the currency range of the shield machine and also to use injection work to prevent the ground from collapsing.

<D> Due to the above <a> to <c>, the construction cost tends to be high and the construction period tends to be long.

<Purpose of the present invention> The present invention has been made to solve the above problems, and its object is to shorten the construction period by continuously constructing with a side shaft with a single shield machine. Another object of the present invention is to provide a shield machine that can reduce the construction cost.

<Means for Solving Problems> That is, the present invention provides a front shield provided with excavating means, excavating means, and lining means, and a cylindrical rear shield located on the tail side of the front shield and having both ends open. The front shield has a pair of support shafts that can move in and out from the peripheral surface, the rear shield has a pair of connecting arms that extend toward the float shield, and the inside of the front shield that can move in and out toward the front shield. A shield that accommodates a shell, and has a shape in which a peripheral edge of one end of the inner shell is capable of contacting an outer peripheral surface of the front shield, and the front shield is configured to be rotatable around the connecting arm and a support shaft as a fulcrum. It is an excavator.

<Description of the Present Invention> The present invention will be described below with reference to the drawings.

<B> Overall Configuration of Shield Machine FIG. 1 and FIG. 2 show an overall view of the shield machine according to the present invention.

The shield machine is composed of two cylinders, the front part of which is composed of a front shield 10 which has the function of independently excavating like a conventional shield machine, and the rear cylinder is composed of a rear shield 20.

The front shield 10 is rotatably and separably connected to the shear shield 20.

Hereinafter, each part will be described in detail.

<B> Front shield The front shield 10 is equipped with a shield body 11, a jack 12 for excavation, a cutter head 13 as excavation means, and an erector device (not shown), for example, a mud pressure type, earth pressure balance type, limited pressure air, etc. It is a known shield machine of.

The cutter head 13 has a built-in copy cutter 14.

The difference from the conventional shield machine is that the shield body 11
Support shafts for connecting to the rear shield 20 at two locations on the peripheral surface of the
The point is that 15 and 15 can be freely moved in and out.

The support shafts 15, 15 are preferably formed at the midpoint of the entire length of the front shield 10.

Also, on the peripheral surface of the shield body 11, workers and segments
An openable and closable hatch 16 into which 30 can be carried is provided.

<C> Rear shield The rear shield 20 is a double-structured cylinder, that is, the shield body 11
An outer shell 21 having the same diameter as that of the inner shell and an inner shell slidably accommodated in the outer shell 21.
Has 22.

Connecting arms 23, 23 extending along the axial direction of the outer shell 21 are provided at two locations on the outer peripheral surface of the outer shell 21, and the support shaft 15 is provided on the opposing surfaces of the free ends of the arms 23, 23. Supporting holes 24, 24 are provided.

The entire circumference of the lower end of the inner shell 22 is formed in a shape that abuts on the outer peripheral surface of the shield body 11, and in order to maintain water tightness with the outer periphery of the shield body 11 and to make a close contact therewith, an air bag type Sealing material 25 such as is provided.

A plurality of jacks 26 are provided on the inner peripheral surface of the inner shell 22.

The jack 26 functions to get a reaction force from the existing segment 30 to drive the shield machine when the vertical shaft is constructed, and also cooperates with the inner shell 22 at the start of the horizontal shaft to construct the front. Functions to pivot shield 10 at approximately right angles.

Further, the shear shield 20 may be equipped with an erector device for segment assembly during construction of a vertical shaft.

Further, the structure of the connecting portion of both shields 10 and 20 will be described based on FIG. 3. A ring plate 50 having both a water blocking function and a connecting function can be attached to and detached from the inner end portion of the connecting portion of both shields 10 and 20. It is bolted to and the ring plate 50 is removed when the direction of the front shield 10 is changed.

<Operation> Next, a method of constructing a vertical shaft and a horizontal shaft using a shield machine will be described.

[I] Construction of vertical shaft (Fig. 2) <A> Excavation The shield shield machine, in which the front shield 10 and the rear shield 20 are integrated vertically, is used to excavate downward.

<B> Propulsion Next, the jack 26 is extended to obtain a reaction force from the existing segment 30, and the shield machine is propelled downward.

If the connecting arm 23 interferes with the digging process,
It is advisable to provide excavation means by high-pressure water injection at the lower end of 23.

Further, during the excavation of the vertical shaft A, the inner shell 22 is temporarily fixed to the outer shell 21 by bolts or the like to restrain the free sliding so that the excavation force is effectively transmitted to the shield machine.

<C> Lining The propulsion jack 26 is contracted, the segments 30 are assembled in the rear shield 20, and the vertical shaft A is extended.

The segment 30 is assembled by an erector device equipped on the rear shield 20, or by using a ground crane or the like.

[II] Direction change (Figs. 4 to 7) <A> Overcut (Fig. 4) Copy cutter over the turning range of the front shield 10 just before the front shield 10 reaches the construction depth of the shaft.
Dig while overcutting at 14.

In order not to become an obstacle when turning the front shield 10,
After excavating a little deeper than the planned rotation position, the shield machine is retracted to a predetermined position by utilizing the mud pressure of the face.

Next, as shown in FIG. 5, after assembling one ring segment 30a in the tail portion of the front shield 10, the uppermost opening of the front shield 10 is closed by the front blind lid 17.

One ring of the segment 30a is assembled in the front shield 10 in order to attach the front blind lid 17.

Thereafter, as also shown in FIG. 4, a rear blind lid 27 is attached to the lower shell opening of the inner shell 22 of the rear shield 20.

The rear blind cover 27 has a hatch 28 at the center of the circular plate which serves as an entrance and exit for earth and sand and company employees, and is equipped with a jack 29 for initial rotation in the penetrating direction of the circular plate near the peripheral edge of the circular plate.

<B> Rotation of Front Shield The following initial rotation jack 29 pushes the projection 18 of the front blind lid 17 stepwise to rotate the front shield 10 by a certain angle.

Front shield 10 only by extending the jack 29 for initial rotation
It is not possible to rotate 90 °.

Therefore, the spreader at the free end of the jack 26 is connected to the segment 30 forming the shaft A, and the inner shell 22 and the outer shell 21 are connected.
If the jack 26 is extended after releasing the
The curved lower end of the inner shell 22 presses the outer peripheral surface of the front shield 10, and the force of the inner shell 22 acts as the turning force of the front shield 10.

When the front shield 10 rotates 90 ° with respect to the axis of the rear shield 20, the lower end peripheral edge of the inner shell 22 contacts the peripheral surface of the front shield 10.

When the front shield 10 is rotated, the openings at the joints between the shields 10 and 20 are completely closed by the blind lids 17 and 27, so that the shields 10 and 20 will not be flooded.

Further, when the tail portion of the front shield 10 is expected to collide with the lower end of the rear shield 20 when the front shield 10 is rotated, the connecting arm 23 is configured to be expandable and contractable.

<C> Post-processing of overburden space After the rotation of the front shield 10 is completed, as shown in FIG. 7, the overfill space formed in the rear and bottom portions of the front shield 10 is filled with a filler 40 such as concrete. .

As a result, the vertical shaft A becomes the starting vertical shaft of the front shield 10.

Further, after waiting for the effect of the filling material 40, the inner shell 22 is pressed against the upper peripheral surface of the front shield 10 to stop water, and then the hatch 28 of the rear blind lid 27 is opened to open the rear blind lid 27 and the front shielded. Remove the soil for 10 days.

<D> Separation of the front and rear shields In parallel with the work for attaching the labor blind lids 17, 27, each support shaft 15
Back to release the connection with the connecting arm 23,
Release the connected state of.

Incidentally, the rear shield 20 is constructed by disassembling the members excluding the outer shell 21 and carrying them out to fill only the outer shell 21.

[III] Construction of a horizontal shaft (Fig. 8) <B> Progress of a horizontal shaft As described above, since one ring segment 30 is assembled in the front shield 10, the float shield 10 is used as a foothold. Dig laterally.

Until the front shield 10 finishes passing through the vertical shaft, the inner shell 22 is pressed to stop the water between the shields 10 and 20.

<B> Post-processing of the intersection of the vertical shaft and the horizontal shaft After constructing several rings 30 for the horizontal shaft B by the front shield 10, the rear blind lid 27 shown in Fig. 1 is removed to cross the vertical shaft A with the horizontal shaft B. Line the part with a segment or cast-in-place concrete.

In addition, so that the intersection of vertical shaft A and horizontal shaft B has a communication structure,
It is necessary to leave the segment 30 unassembled at the communicating portion of the side shaft B.

The subsequent construction method of the shaft B is the same as the conventional method.

<Effects of the Present Invention> Since the present invention is as described above, the following effects can be obtained.

<a> Both vertical and horizontal shafts can be constructed with the same shield machine, and there is no need to use multiple types of machines as in the past.

Therefore, the construction period can be greatly shortened and the construction cost can be reduced.

<B> Since the vertical shaft can be constructed with the same diameter as the horizontal shaft, it is more advantageous than the conventional one in terms of the site cost of the vertical shaft and the amount of excavation.

<C> When constructing the shaft, the connecting arm protruding from the rear shield functions as a rotation resistance material for the shield machine, so that the shaft can be stably constructed.

<D> A horizontal shaft can be constructed from the vertical shaft in a direction perpendicular to the vertical shaft.

[Brief description of drawings]

FIG. 1: Assembly drawing of shield machine according to the present invention FIG. 2: Vertical sectional view of shield machine when constructing vertical shaft FIG. 3: Partially enlarged view of connecting portion of both shields FIG. 4: Front shield circuit Fig. 5: Longitudinal section with blind lids attached to both shields Fig. 6: Explanatory diagram of front shield just before starting rotation Fig. 7: Front shield rotation Explanatory diagram after movement Figure 8: Overall view of construction of side shaft

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshimi Ino 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo Within Taisei Construction Co., Ltd. (72) Inventor Toshiaki Uehara 13 Showa-cho, Minato-ku, Nagoya, Aichi Ishikawajima Harima (72) Inventor Hiroyuki Ito 13 Showa-cho, Minato-ku, Nagoya, Aichi Ishikawajima Harima Heavy Industry Co., Ltd.

Claims (1)

[Claims] 1. A front shield having excavation means, excavation means, and lining means, and a cylindrical rear shield located on the tail side of the front shield and having both ends open, the front shield having a peripheral surface. Has a pair of support shafts that can freely move in and out of the rear shield, and the rear shield has a pair of connecting arms that extend toward the front shield, and accommodates an inner shell that can freely move in and out toward the front shield. A shield machine having a peripheral edge at one end formed in a shape capable of abutting against the outer peripheral surface of the front shield, and the front shield being configured to be rotatable around the connecting arm and the support shaft as a fulcrum.