JPS5830479B2 - shield tunneling machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shield excavator used particularly when burying pipes or the like deep from the ground surface.

BACKGROUND ART Conventionally, for example, the following method is known as a means for excavating the ground surface with a shield excavator and burying a pipe or the like in the excavated trench.

The first method is to drive steel sheet piles along a predetermined trench excavated from the ground surface, prevent water from collapsing on the walls of the excavated trench, install pipes, etc. in the trench, and then backfill the trench with steel sheet piles. This is the so-called open cut construction method, in which the sheet piles are pulled out.

As a second example, as shown in FIG.
This is carried out using a shield excavator 32 which has horizontal sheet piles 31 movably installed vertically on the outer surface of the shield. The inner face of the horizontal sheet pile 31 that has penetrated is excavated after suppressing the collapse of the side wall with the horizontal sheet pile 31. Next, the propulsive reaction force is taken from the ground contact friction of the outer surface of the horizontal sheet pile 31, and the sheet pile 31 is leveled. frame 30 held in
Pull it out in front of the face.

This is a construction method in which the face is excavated forward by repeatedly performing such operations, and pipes and the like of a predetermined length are successively buried in the rear trench protected by the horizontal sheet pile 31.

However, in the above-mentioned open-cut method in which steel sheet piles are driven from the ground surface, six stubs are required to support the side earth pressure by the steel sheet piles, which also makes excavation difficult, and it is difficult to cut a trench to a specified length. The construction period from start to burial is long, and therefore there are concerns about countermeasures against groundwater intrusion into the excavated trenches during the construction period, the problem of construction pollution, and the ratio of the volume of the buried material to the amount of excavated earth and sand. The depth of excavation by this open-cut method, such as economical issues,
He had his own limits.

On the other hand, in the second construction method, in which horizontal sheet piles 31 are used to promote excavation and burying, the length of the trench that is constantly being excavated is small, and the problem of construction pollution is relatively small; Since the earth and sand are used for backfilling at the rear, there are advantages in that the amount of earth and sand carried out is small and excavation within the trench can be carried out easily. However, as the open trench becomes deeper, the self-sustaining angle of the front face to be excavated becomes looser. Due to the strength of the sheet pile 31, it has been impossible to prevent the face at the front of the excavation from collapsing with the sheet pile 31 extending forward from the frame 30.

Moreover, the sheet pile 31 constituting this type of shield excavator 32
For example, as shown in FIG. 1 above, the front part of the frame 30 is overhanging, and the length of the overhang of the sheet pile 31 is determined to be enough to hold the side earth pressure applied from the outer surface of the sheet pile 31. There were restrictions on strength.

In other words, the sheet pile 31 is large enough to cover the self-supporting angle of the front face.
However, in sandy soils where the self-supporting angle of the face is small, the lateral earth pressure is large, and it is extremely difficult to make the sheet pile overhang length enough to satisfy this condition. there were.

Especially when the trench is deep, the lateral earth pressure will naturally increase.
In addition, the face slope was long enough to maintain the self-supporting angle of the face, making it impossible to protect the ditch side walls with horizontal sheet piles.

This invention was devised to solve the problems of the conventional shield tunneling machine described above, and consists of two shield tunneling machines stacked one on top of the other, and a single shield tunneling machine installed on the overlapping surface of the two shield tunneling machines. A shelf board that can freely slide back and forth is interposed between the front and back walls, and this shelf board penetrates the front face to maintain the self-supporting angle of the front face, and two shield excavators installed above and below the shelf board are alternately propelled to excavate. However, it is an object of the present invention to provide a shield excavator capable of excavating and burying particularly deep trenches.

The present invention will be described in detail below based on FIGS. 2 to 9 of the accompanying drawings.

In Figures 2 and 3, 1 or 2 shield excavators 2
, 3 are stacked one above the other (hereinafter referred to as the shield body). A shelf board 6, which will be described later, is interposed between the front frames 4.5 of the two shield tunneling machines 2 and 3. It's a shame.

The front frames of the shield tunneling machines 2 and 3 and 4, 5
A plurality of horizontal sheet piles 7 and 8 are attached to both sides of the frame, and these sheet piles 7 and 8 are horizontally moved by shield jacks 9 and 10 interposed between the front frames 4 and 5. This shield jack 9 is configured to be slidable.
, 10 are pin-coupled to the sheet piles T and 8, and their rear ends are pin-coupled to the side walls of the front frames 4, 5.

A bottom sheet pile 11 is provided at the bottom of the shield excavator 3 provided below the shelf board 6, and this bottom sheet pile 11 can be slid back and forth by a jack 12 interposed between it and the front frame 5. It is composed of

The shelf board 6 interposed between the shield tunneling machines 2 and 3 is formed in a hollow shape, as shown in FIGS. 2 and 4 to 6, and is located on both sides of the shelf board 6. A plurality of rollers 13 are provided on the lower surface of the shelf board 6 to transfer the top surface of the shield tunneling machine 3, and rollers 13 that transfer the top surface of the shield tunneling machine 2 are also arranged on the top surface of the shelf board 6 so as to support the bottom surface of the shield tunneling machine 2. It is set up.

Between the shelf board 6 and the lower shield excavator 3, there is a shelf board 6,
A propulsion jack 14 is interposed to propel the shelf board 6 toward the face, and the shelf board 6 is moved independently by the operation of the propulsion jack 14.

Further, the tip of the shelf board 6 is formed to be hollow and sharp so that it can firmly penetrate into the face surface, as shown in FIG. A discharge port 15 is formed to prevent the water from exiting to the outside (downward).

Note that this shelf board 6 may be constructed of a plurality of sheet piles 16 as shown in FIGS. 7 and 8.

Behind the upper and lower shield excavators 2 and 3 are sheet piles 25.2 for protecting the side walls while burying pipes etc. in the excavated trenches.
Equipped with a rear device 17°18 with 6 on both sides,
These rear devices 17 .
A wheel 22 mounted on the bottom of the frame 20 is interposed between the 18 frames 20 and 21.

Note that the rear sheet piles 25 and 26 corresponding to the front sheet piles 7 and 8 are connected with pins.

Next, the operation of the present invention will be explained based on FIG. 9.

First, the shield excavator main body 1, which is constructed as a whole as described above, is assembled with the lower shield excavator 3 and its rear device 18 in a shaft, and after burying earth and sand on both outer surfaces of horizontal sheet piles 8.26, the lower shield The upper shield excavator 2 and its rear device 17 are assembled on the upper surface of the excavator 3 and the rear device 18, and the shafts of the shaft are successively constructed while filling the outer surfaces of both sides of the horizontal sheet piles 7 and 25 with earth and sand. Remove.

After the removal of the struts inside the shaft is completed in this way, the excavation work begins.

As shown in Fig. 9A, the shield jack 9 of the upper shield excavator 2 is operated to contract, and the horizontal sheet piles 7 are sequentially penetrated into the face, and then the lower shield excavation is carried out as shown in Fig. 9. Propulsion jack 1 interposed between machine 3 and shelf board 6
4 is contracted and the shelf boards 6 are successively penetrated into the face surface.

After the shelf board 6 is penetrated into the front face and its tip is held, the horizontal sheet pile 7 which has already pushed out the front full seam 4 provided on the upper shield excavator 2 into the front face
The shield jack 9 is extended and moved forward by applying a propulsive reaction force to the external earth pressure, and the front face is divided into two stages as shown in 8 of FIG.

Then, the horizontal sheet pile 7 of the upper shield excavator 2 is again penetrated into the face via the shield jack 9, and after excavating while protecting the side wall, the upper front frame 4 is moved forward as before using the shelf board 6 as a bridge. Then, as shown in Figure 9-2, seat it on the shelf of the front face.

Note that the rear device 17 is connected to the front frame 4 and the connecting device 19.
Since the front frame 4 moves forward toward the front face, it moves following it, and when the shelf board 6 penetrates the front face, the excavated earth and sand on that face is transferred to the shelf board 6. It passes through the hollow interior of the tank and is discharged from the discharge port 15 into the lower shield excavator 3.

Next, the operation of the lower shield excavator 3 is exactly the same as that of the upper shield excavator 2, and excavates and advances the horizontal sheet pile 8 via the shield jack 10, as shown in FIG. At the same time, the front frame 5 is moved forward as shown in FIG.

Further, the bottom sheet pile 11 is caused to penetrate into the front face by applying a propulsion reaction force to the horizontal sheet pile 8 and causing the propulsion jack 12 to extend.

For other operations, see upper shield excavator 2.
Since it is exactly the same as , it is omitted.

Once a trench of a predetermined depth has been created in this way, the construction work is proceeded by sequentially burying pipes A, etc. in the long trench behind it.

As described above, this invention interposes a shelf board that can independently move forward between the upper and lower shield tunneling machines, penetrates the front face into the front face to partition the front face into a plurality of stages, and furthermore, the upper part of the face is In addition, the shield excavator above the shelf is bridged to the top of the face, and the front face is constantly cut off into multiple stages. By increasing the self-supporting angle, it is possible to protect the side walls of deep trenches with the same length of sheet pile overhang as the shallow trench cutting, which was limited in conventional devices.

[Brief explanation of drawings]

Fig. 1 is a front view of a conventional shield tunneling machine, Fig. 2 is a front view of the present invention, Fig. 3 is a plan view of Fig. 2, and Fig. 4 is a plan view of the shelf board. The diagram shows the V-v line in Figure 4 and the V
FIGS. 7 and 8 are a longitudinal sectional view taken along the line I-VI, and FIGS. 7 and 8 are plan views and front views showing other embodiments of the shelf board. FIGS. be. 1... Shield tunneling machine body, 2, 3...
・Shield excavator, 4, 5...Front frame,
6...Shelf board, 7.8...Horizontal sheet pile, 9
, 10... Shield jack, 11...
・Bottom sheet pile, 12... Jacket, 13...
...Roller, 14...Propulsion jack, 15...
...Discharge port, 16... Sheet pile, 17, 18.
... Rear device, 19 ... Connection device, 20
, 21... Frame, 22... Wheel,
A...Segment.

Claims (1)

[Claims] 1 A shield excavator consisting of a front frame and a horizontal sheet pile connected by a plurality of shield jacks is configured in multiple stages,
A shield excavator characterized in that a hollow shelf plate, which is movable independently with respect to the shield excavator and has an earth and sand discharge port, is interposed between the shield excavators configured in a plurality of stages.