JPH03137320A - Open shield construction method - Google Patents

Abstract

PURPOSE:To save troubles and simply install a decking plate by arranging beam members to be adjustably levelled on the shelves of a shield machine, and supporting a decking plate to blockade the upper opening of the shield machine with the beam members. CONSTITUTION:The upper parts of right and left side wall plates 1a, 1b of an open shield machine 1 are bent at right angles to project for providing right and left horizontal shelves 10. The shield machine 1 is provided in a starting pit, soil is drilled and discharged to advance the shield machine, and a second underground structure 4 is hung down in front of a first underground structure 4. Further, jacks 11 are placed on the shelves 10 of the shield machine 1 to adjustably level the beam members. Nextly, a decking plate 8 is installed on the right and left beam members 12 to blockade the upper opening of the shield machine 1. Hereby, the decking plate 8 can be wholly supported inside the shield machine 1, and assembly of support members and the like can be dispensable.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an open shield construction method for constructing underground structures such as underground passages for water supply and sewage systems, public drains, telegraph and telephone lines, etc. in urban areas.

[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 Figs. 4 and 5. In the figure, 1 is an open shield machine, which consists of left and right side wall plates 1a1b and a bottom plate 1c connecting them, and a U-shaped shield with open front and rear end surfaces and top surface. It is a machine.

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

This shield machine 1 is installed in the starting pit, and the shield machine 1
Excavate the earth and sand in front of the starting shaft from the front or top opening of the
And remove soil. And the propulsion jack 2 of the shield machine 1
The shield machine 1 is advanced by extending the reaction force on the reaction wall in the starting shaft, and the first underground structure 4 made of a concrete box or the like is suspended from above, and the tail part of the shield machine 1 is moved forward. Set it behind the propulsion jack 2, which has been retracted within 1d.

Next, earth and sand are similarly excavated and removed from the front or upper surface of the shield machine 1 using excavating means 6 such as a shahel, auger, or packet, and the shield I 11 is advanced to move the earth and sand in front of the first underground structure 4. The second underground structure 4 is then lowered. 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 shield Once Machine 1 reaches the destination shaft, it will be removed and the construction will be completed.

By the way, if the road surface is to be opened to traffic such as lotus cars during the day, lining plates will be attached to two sides of the shield a1.

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

Figure 6 shows an installation example of this lining machine, 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 the 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 plate shown in FIG. 6, the girder 7 must be dug and buried in a groove shape, and it is troublesome to install it at an appropriate level. It will also be necessary to refill the area where girder 7 was once the lining board has been used and removed.

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

SUMMARY OF THE INVENTION An object of the present invention is to provide an open shield construction method that eliminates the disadvantages of the conventional example and allows a lining board to be installed easily without any troublesome effort.

[Means for Solving 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 excavates the following case etc. The shield machine is advanced by the propulsion jack using the reaction force of the existing underground structure, and a new underground structure is lowered from the upper surface of the tail part of the shield machine in the front part, and placed in the front row of the existing underground structure. In the open shield construction method, in which the shield machine excavates by repeating the same process, 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 shield machine The girder material is arranged in the direction so that the level can be adjusted with a jack, and the girder material supports a lining machine that closes the top opening of the shield machine, and the shield machine has two parts of the left and right side walls at right angles to the outside. Horizontal shelves are formed on the left and right sides, and beams are hung between these shelves in the middle of the shield machine. Jacks are placed on the beams at appropriate intervals, and the jacks are placed perpendicular to the beams. The girder material in the direction is supported by this jack so that its level can be adjusted, and the girder material supports a lining plate that closes the opening on the top surface of the shield machine.

[Effect]

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

Also, shield machines often tilt when digging,
By adjusting the level of the girders horizontally with jacks, the lining board can always be held horizontally.

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

First, the oven shield machine 1 used in the oven 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 that of 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 Ib, and the lower end is opened at the front and rear end faces and the upper face, which are connected by the bottom plate 1c.

In the oven shield machine 1, propulsion jacks (not shown) are disposed rearwardly and vertically arranged inside the left and right side wall plates 1a and Ib. 3 in the figure is a partition wall installed inside the shield machine 1.

Next, the open shield construction method of the present invention using the oven 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 1 is installed in the starting shaft. Then, 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, and the reaction force is taken by the reaction wall in the launch shaft to advance the shield machine 1.
A first underground structure 4 made of a concrete box or the like is suspended from above and set behind the propulsion jack 2 which is retracted within the tail portion Id of the seal 1 machine 1.

Next, earth and sand are similarly excavated from the front or upper surface of the shield machine 1 using the excavating means 6 such as a shahel, an auger, and a bucket shade, and the earth is discharged, and the shield machine 1 is advanced, and the first underground structure 4 is excavated. The second underground structure 4 is suspended in front.

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 to the rear underground structures 4'', and open the underground structures 4. Seal 1
Once Machine 1 reaches the destination shaft, it will be removed and the construction work will be completed.

In addition, when the shield machine 1 excavates, the excavation part increases only in the overhanging parts of the left and right side wall plates 1a and lb where the shelf part 10 is located, but in soft ground etc., this overhanging part will cause the shield machine 1 to sink. It also plays a role in suppressing

To set the lining plate 8 while the shielding machine 1 is stopped, place a jack 11 on the shelf 10 of the shielding machine 1, and use this jack 11 to adjust the level of the girder material J2 placed in the longitudinal direction of the shield) al. Support.

Then, lining plates 8 are attached to the left and right girders 12 of this shelf 10.
Then, the lining plate 8 closes the upper opening of the shield machine 1.

By the way, the shield machine 1 bends when moving forward, and may tilt 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 passed between the shelves 10 toward the inside of the shield machine 1, and jacks 11 are placed 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 girders 12 can be provided in accordance with the width of the lining board 8, and a plurality of parallel lining boards 8 can be connected to the beam members 13.
It can be supported securely on the top.

〔Effect of the invention〕

As mentioned above, 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., and the lining plate can be easily installed without any troublesome effort. .

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

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view showing the first embodiment of the open shield construction method of the present invention, Fig. 2 is a longitudinal sectional front view showing the second embodiment of the same as above, and Fig. 3 is a perspective view of the open shield machine used.
FIG. 4 is a vertical side view showing an overview of the open shield construction method, FIG. 5 is a cross-sectional plan view of the same, and FIG. 6 is a vertical front view showing a conventional example. 1... Open shield machine la, Ib... Side wall plate 1d... Tail portion 3... Bulkhead 5... Backfilling 7... Girder 9... Support frame 9b... Girder 11 ... Jacket 13 ... Beam material 1c ... Bottom plate 2 ... Propulsion jack 4 ... Underground structure 6 ... Excavation means 8 ... Lining plate 9a ... Support column 10 ...・Shelf part 12... Girder material No. 2] Fig. 3 Fig. 5

Claims (2)

[Claims] (1) A propulsion jack is installed inside the shield machine with its front and rear ends and top open, and excavation is carried out from the front or top of the front part of the shield machine. The shield machine is moved forward, and a new underground structure is suspended 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 thereafter to allow the shield machine to dig.Open shield In the construction method, the shield machine has the upper parts of the left and right side walls project outward at right angles to form horizontal shelves on the left and right, and girders are placed on these shelves in the longitudinal direction with jacks interposed so that the level can be adjusted. An open shield construction method characterized in that the girder material supports a lining plate that closes an opening on the top surface of the shield machine. (2) Install a propulsion jack inside the shield machine with its front and rear ends and top open, excavate from the front or top of the front part of the shield machine, and use the propulsion jack to move the shield machine using the existing underground structures such as the following box as a reaction force. The shield machine is moved forward, and a new underground structure is suspended 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 thereafter to allow the shield machine to dig.Open shield In the construction method, the shield machine has the upper parts of the left and right side walls protruding outward at right angles to form horizontal shelves on the left and right, and the beams are strung across the width of the shield machine between these shelves, and the beams are placed on the beams as appropriate. Jacks are arranged at intervals, girder members in a direction perpendicular to the beam members are supported by the jacks in a level-adjustable manner, and the girder members support a lining plate that closes the opening on the top surface of the shield machine. Open shield construction method.