JPH054491B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is applicable to urban areas for water supply and sewage, public drainage, telegraph,
Concerning the open shield construction method for constructing underground structures such as underground passages for laying telephones, etc.

[Conventional technology]

The open shield construction method is a highly rational construction method that takes advantage of the advantages of the cut-and-cover construction method (open construction method) and the shield construction method.

The outline is shown in Fig. 4 and Fig. 5. In the figure, 1 is an open shield machine, and this is the left and right side wall plate 1.
It consists of a, 1b and a bottom plate 1c connecting them,
It is a U-shaped shield machine with openings on the front, rear, and top surfaces.

The open shield machine 1 has propulsion jacks 2 arranged vertically and facing rearward. 3 in the figure indicates a partition wall provided within the shield machine 1.

This shield machine 1 is arranged in a starting shaft, and earth and sand in front of the starting shaft is excavated and discharged from the front or top opening of the shield machine 1. Then, the propulsion jack 2 of the shield machine 1 is extended to apply a reaction force to the reaction wall in the launch shaft to move the shield machine 1 forward, and the first underground structure 4 made of a concrete box or the like is suspended from above. Down, tail part 1d of shield machine 1
Set it behind the propulsion jack 2 that has been retracted inside.

Next, earth and sand are similarly excavated from the front or upper surface of the shielding machine 1 using an excavating means 6 such as a shovel, an auger, or a bucket, and the earth is discharged to move the shielding machine 1 forward. First, the second underground structure 4 is suspended. Thereafter, the same excavation and setting process of the underground structures 4 is repeated to sequentially bury the underground structures 4 in the ground in columns, backfill 5 is applied on the rear underground structures 4, and open shielding is performed. Once Machine 1 reaches the destination shaft, it will be removed and the construction will be completed.

By the way, when the road surface is opened to the passage of vehicles such as buses during the day, a lining plate is attached to the top surface of the shield machine 1.

By installing the lining board in this way, there is no need to disrupt road traffic while work is suspended.

Figure 6 shows an example of installing this lining plate, in which a girder 7 made of H-shaped steel or the like is installed near the ground surface on the outside of the shield machine 1, and this girder 7 supports the lining plate 8. I have to.

In addition, when the width of the shielding machine 1 is large and a plurality of lining plates 8 are to be supported side by side, a supporting frame 9 consisting of columns 9a and girders 9b is assembled inside the shielding machine 1, and these girders 9b and girders 7 are aligned. It is designed to support two lining boards 8.

[Problem to be solved by the invention]

In the method of installing the lining board shown in FIG. 6, the girder 7
The girder 7 must be dug and buried in a trench shape, and it is troublesome to install it at the appropriate level.Furthermore, when the shield machine 1 is moved, the girder 7 must also be replaced, and the lining plate is no longer used. After removing with digit 7
It will also be necessary to backfill the area where the damage occurred.

In particular, when supporting a plurality of lining plates 8 side by side, it is necessary to assemble the supporting frame 9.

The purpose of the present invention is to eliminate the disadvantages of the conventional example,
To provide an open shield method by which a lining board can be easily installed without any troublesome effort.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention provides a propulsion jack in a shield machine with openings at the front and rear ends and the top surface, excavates from the front surface or the top surface of the front part of the shield machine, and applies reaction force to existing underground structures such as a following box. Then, the shield machine is moved forward using the propulsion jack, and as the shield machine moves forward, a new underground structure is lowered from the upper surface of the tail part of the shield machine and placed in the front row of the existing underground structure, and the same process is repeated. In the open shield construction method in which a shield machine is used to excavate, the shield machine extends the upper parts of the left and right side walls at right angles to the outside to form horizontal shelves on the left and right, and inserts girders in the longitudinal direction on these shelves with jacks. The shield machine is arranged so that its level can be adjusted, and the girder supports a lining plate that closes the top opening of the shield machine, and the shield machine has the upper left and right side walls protruding outward at right angles, and a horizontal shelf is placed on the left and right sides. form,
A beam is hung between the shelves in the width direction of the shield machine, jacks are placed on the beam at appropriate intervals, and the beam in the direction perpendicular to the beam is supported by the jack so that its level can be adjusted. The gist is to support a lining plate that closes the opening on the top surface of the shield machine using the girder material.

[Effect]

According to the present invention, the lining plate can be entirely supported inside the shielding machine, and is supported using the body of the shielding machine, so there is no need to assemble a supporting frame or the like.

Additionally, shield machines often tilt when excavating, but by adjusting the level of the girders horizontally using jacks, the lining plates can always be kept horizontal.

〔Example〕

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

First, the open shield machine 1 used in the open shield construction method of the present invention will be described. As shown in FIG. Horizontal shelf portions 10 were formed on the left and right sides by overhanging them.

The other configuration is the same as the conventional example, and it is a U-shaped shield machine in which blade openings are formed in the front parts of the left and right side wall plates 1a and 1b, and the lower end is opened at the front and rear end faces and the upper face connected by the bottom plate 1c.

The open shield machine 1 has propulsion jacks (not shown) arranged vertically and facing rearward inside the left and right side wall plates 1a and 1b. Reference numeral 3 in the figure indicates a partition wall provided within the shield machine 1.

Next, the open shield construction method of the present invention using the open shield machine 1 will be explained.

FIG. 1 shows a first embodiment of the present invention. During normal work, it is the same as the conventional example shown in FIGS. 4 and 5, and this shield machine is installed in the starting shaft.
is installed to excavate and discharge earth and sand in front of the starting shaft from the front or top opening of the shield machine 1.
Then, the propulsion jack 2 of the shield machine 1 is extended and a reaction force is applied to the reaction wall in the launch shaft to advance the shield machine 1, and the first underground structure 4 made of a concrete box or the like is suspended from above. And shield machine 1
It is set behind the propulsion jack 2, which has been retracted within the tail portion 1d.

Next, earth and sand are similarly excavated from the front or upper surface of the shielding machine 1 using an excavating means 6 such as a shovel, an auger, or a bucket, and the earth is discharged to move the shielding machine 1 forward. First, the second underground structure 4 is suspended. Thereafter, the same excavation and setting process of the underground structures 4 is repeated to sequentially bury the underground structures 4 in the ground in columns, backfill 5 is applied on the rear underground structures 4, and open shielding is performed. Once Machine 1 reaches the destination shaft, it will be removed and the construction will be completed.

In addition, when the shield machine 1 excavates, the shelf 1
The excavation portion is increased by the overhanging portions of the left and right side wall plates 1a and 1b where 0 is located, but this overhanging portion also plays a role in suppressing the sinking of the shield machine 1 in soft ground.

To set the lining plate 8 while the shield machine 1 is stopped, place a jack 11 on the shelf 10 of the shield machine 1, and use the jack 11 to adjust the level of the girder 12 placed in the longitudinal direction of the shield machine 1. Support.

Then, a lining plate 8 is placed over the left and right girders 12 of this shelf 10, so that the lining plate 8 closes the upper opening of the shielding machine 1.

By the way, the shield machine 1 bends when moving forward, and sometimes tilts back and forth or left and right.

Therefore, by operating the jack 11 to adjust the level of the girder 12 so that it is horizontal, the lining board 8 can also be laid horizontally to match the ground surface.

FIG. 2 shows a second embodiment of the present invention, in which the shielding machine 1 has a large cross-sectional width, and a plurality of lining plates 8 that close the upper opening are arranged side by side. .

In such a case, a beam 13 is stretched between the shelves 10 in the width direction of the shield machine 1, and jacks 11 are arranged on the beam 13 at appropriate intervals.

A beam member 12 in a direction perpendicular to the beam member 13 is supported by the jack 11 so that its level can be adjusted, and a lining plate 8 that closes the upper opening of the shield machine 1 is supported by the beam member 12.

In this way, the beam members 12 can be provided in accordance with the width of the lining board 8, and the plurality of parallel lining boards 8 can be reliably supported on the beam members 13.

〔Effect of the invention〕

As described above, in the open shield construction method of the present invention, the lining plate can be supported entirely inside the shield machine, and since it is supported using the body of the shield machine, there is no need to assemble a support frame, etc., which is troublesome. The lining board can be easily installed without the need for a lining plate.

In addition, the shield machine can always hold the lining plate horizontally regardless of its inclination.

[Brief explanation of the drawing]

Figure 1 shows the first example of the open shield construction method of the present invention.
FIG. 2 is a longitudinal front view showing the second embodiment of the same, FIG. 3 is a perspective view of the open shield machine used, and FIG. 4 is a longitudinal side view showing an outline of the open shield construction method. , FIG. 5 is a cross-sectional plan view of the same as above, and FIG. 6 is a vertical cross-sectional front view showing the conventional example. 1...Open shield machine, 1a, 1b...Side wall plate, 1c...Bottom plate, 1d...Tail part, 2...
Propulsion jack, 3... bulkhead, 4... underground structure,
5... Backfill, 6... Excavation means, 7... Girder material, 8
... Lining board, 9 ... Shoring frame, 9a ... Pillar, 9b
... Girder, 10 ... Shelf, 11 ... Jacket, 12
...Girder material, 13...Beam material.

Claims (1)

[Scope of Claims] 1. A propulsion jack is provided in a shield machine with openings at the front and rear ends and the top surface, and excavation is carried out from the front surface or the top surface of the front part of the shield machine, and the propulsion jack is used as a reaction force from an existing underground structure such as a following box. Move the shield machine forward, use this forward movement to lower the new underground structure from the upper surface of the tail part of the shield machine, position it in the front row of the existing underground structure, and repeat the same process to move the shield machine. In the open shield method of digging, the shield machine extends the upper parts of the left and right side walls at right angles to the outside to form horizontal shelves on the left and right, and the level can be adjusted by inserting girders in the longitudinal direction on these shelves with jacks. An open shield construction method characterized in that the girder material supports a lining plate that closes an opening on the top surface of a shield machine. 2 A propulsion jack is installed inside the shield machine with its front and rear ends and top open, and excavation is done from the front or top of the front part of the shield machine, and the propulsion jack moves the shield machine forward using the reaction force of the existing underground structure such as the following box. In the open shield construction method, a new underground structure is suspended from the upper surface of the tail of the shield machine during this forward movement, placed in the front row of the existing underground structure, and the same process is repeated to allow the shield machine to dig. , the shielding machine has the upper parts of the left and right side walls extending outward at right angles to form horizontal shelves on the left and right, and the beams are strung across the width of the shielding machine between these shelves, and the beams are placed on the beams at appropriate intervals. An open shield characterized in that a jack is provided, a girder in a direction perpendicular to the beam material is supported by the jack so that the level can be adjusted, and the girder supports a lining plate that closes an opening on the top surface of the shield machine. Construction method.