JP2759416B2 - Open shield machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an open shield machine for constructing underground structures such as underground passages and underground waterways.

[0002]

2. Description of the Related Art The open shield method is rich in rationality, making use of the advantages of the open-cut method (open method), which excavates from the ground, and the shield method, which excavates at the tip of a shield machine without affecting the ground at all. It is a construction method.

The open shield method will be described first. As shown in FIGS. 6 and 7, reference numeral 1 denotes an open shield machine, which comprises left and right side wall plates 1a as main constituent members and a bottom plate and a beam member therebetween. The front surface, the rear surface, and the upper surface are connected to form an opening, the front end is formed as a blade port 2, and a plurality of propulsion jacks 3 are arranged vertically rearward at the left and right positions near the center or the rear end of the side wall plate 1a. A slidable movable side plate 1b is provided at the tip of the side wall plate 1a.

[0004] In the drawing, reference numeral 7 denotes a pressure-receiving member which is appropriately suspended from above at the rear end of the propulsion jack 3, and is formed of a frame made of box steel or die steel. In the figure, reference numeral 8 denotes a partition wall which partitions a front excavation portion and a rear portion in the open shield machine 1.

[0005] The open shield method is carried out between a starting pit and a reaching pit. Although not shown, the open shield machine is assembled in the start pit, the ground in front of the start pit is excavated by a shovel type excavator 6 installed on the ground, and the propulsion jack 3 of the open shield machine 1 is extended to start. The open shield machine 1 was advanced by applying a reaction force to the reaction wall in the mine, and the first concrete box 4 forming the underground structure was suspended from above and shrunk in the tail portion of the open shield machine 1. Set behind the propulsion jack 3. A strut is arranged between the propulsion jack 3 and the reaction wall to adjust the distance as appropriate. The starting pit is composed of a retaining wall such as a sheet pile, and the retaining wall is partially mirror-cut in order to start the open shield machine 1. Some improvements have been made.

Next, similarly, the excavator 6 excavates earth and sand from the front surface or the upper surface of the open shield machine 1 and discharges the earth to advance the open shield machine 1, and moves the open shield machine 1 forward before the first concrete box 4. The second concrete box 4 is suspended in the tail of the shield machine 1. Hereinafter, the same excavation and setting process of the concrete box 4 are repeated, and the concrete boxes 4 are sequentially buried in the ground in a column, and the backfill 5 is placed on the rear concrete box 4 using a dozer shovel or the like. Although not shown, if the open shield machine 1 reaches the destination pit, it is disassembled and removed to complete the construction.

[0007]

In the case of curve construction, of the left and right propulsion jacks 3, the jack on the side to be bent is free, and only the jack on the opposite side is extended. By doing so, the outside along the curve is greatly pushed out, and the open shield machine 1 is largely bent.

[0008] However, the propulsion jack on the opposite side to the propulsion jack on the extension side also becomes free and dragged and extended, so that an efficient bending operation may not be obtained.

It is an object of the present invention to provide an open shield machine which can solve the above-mentioned disadvantages of the prior art and can obtain a reliable bending.

[0010]

According to the present invention, in order to achieve the above object, the front, rear and upper surfaces are opened, and a plurality of propulsion jacks are arranged inside the side wall plate at the left and right positions in the left and right positions. In the open shield machine, the tail side of the open shield machine and the top concrete box side were connected by a rod so that it could be attached to the propulsion jack. It is assumed that.

[0011]

According to the present invention, in the case of curve construction, the propulsion jack on the side extending and the propulsion jack on the opposite side also become free to be dragged and extended, but this is forcibly reduced by the retraction device. As a result, a reliable bending of the open shield machine can be obtained. In addition, even when the open shield machine is moving straight ahead, the retracting device can forcibly reduce the size by the left and right propulsion jacks, thereby enabling a quicker operation.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a longitudinal sectional side view showing one embodiment of an open shield method using an open shield machine of the present invention. The same components as those in FIGS. 6 and 7 showing the open shield method are given the same reference numerals. .

First, the open shield machine 1 according to the present invention will be described. The open shield machine 1 has a front surface, a rear surface, and an upper surface opened as in the prior art, and the propulsion jack 3 is directed rearward inside the side wall plate 1a. A plurality of them are arranged vertically.

As shown in FIGS. 2 to 5, the open shield machine 1 is provided with a movable side plate 1b which is pushed and retracted by a slide jack 9 at the tip of a side wall plate 1a. Then, the propulsion jack 3 is arranged behind the slide jack 9.

In the figure, reference numeral 10 denotes a pressure receiving member made of a steel frame such as an H-shaped steel, which has a size similar to that of the concrete box 4, and is provided on the front end face of the leading concrete box 4 as shown in FIG. It is stacked and fixed to the concrete box 4 with a tension member 11 such as a screw steel rod penetrating therethrough. 12 in the figure is tension material
A fixing device comprising a combination of a fixing plate and a nut for fixing the end of 11. On the concrete box 4 side, a box-cut recess 13 is formed in the leading concrete box 4 or the concrete box 4 behind it. A tension material in this recess 13
The fixing holes are fixed by the fixing device 12 in the concave portions 13 by communicating the insertion holes 11.

The pressure receiving member 10 is integrally formed with a skirt-shaped collar portion 14 toward the rear. The front portion of the concrete box 4 is fitted into the collar portion 14, and the pressure receiving member 10 is in contact with the front end face of the concrete box 4. A buffer 15 made of neoprene rubber or the like was interposed between the member 10.

As shown in FIG. 3, the open shield machine 1
And the pressure receiving member 10 are connected by a rod 16 made of a PC steel rod, and the rod 16 can be pulled by a towing jack 17,
A retraction device 18 composed of a combination of the rod 16 and the traction jack 17 is provided alongside the propulsion jack 3.

Next, an open shield method using such an open shield machine 1 of the present invention will be described. The open shield method is constructed between the starting pit and the reaching pit. The open shield machine 1 is assembled in the starting pit 19.

In this manner, the ground in front of the starting pit 19 is excavated by the backhoe type shovel type excavator 6 in the open shield machine 1, and the propulsion jack 3 of the open shield machine 1 is extended to start the starting pit 19 The open shield machine 1 is moved forward by applying a reaction force to the reaction wall 20 inside, and the first concrete box 4 forming the underground structure is suspended from above,
It is set behind the propelled jack 3 that has been shortened in the open shield machine 1. The first concrete box 4 has the pressure-receiving member 10 attached to the front end face, and the pressure-receiving member 7 is suspended from the rear, and is disposed between the pressure-receiving member 7 and the reaction wall 20. Arranged the propulsion jack 21.

Next, similarly, the backhoe-type shovel excavator 6 in the open shield machine 1 excavates and removes earth and sand from the front of the open shield machine 1 and extends the propulsion jack 3 to open the open shield machine 1. Is advanced, and the propulsion jack 3 is reduced.

The pressure receiving member 7 and the first concrete box 4 are pushed out by extending the propulsion jack 21 by the reduced amount of the propulsion jack 3. The propulsion jack 21 is contracted by the amount of the extrusion, and the second concrete box 4 is suspended and arranged in the starting pit 19 so as to be in a row behind the first concrete box 4.

Hereinafter, similarly, a step of excavating and discharging earth and sand in front of the open shield machine 1
A process of extending the open jack 3 by extending the inside of the propulsion jack 3 by making the concrete box 4 a reaction force, and from the starting pit 1 side until the propelled jack 3 contracts in the tail portion of the open shield machine 1. The propulsion step of pushing the concrete box 4 by the propulsion jack 21 and the step of suspending the concrete box 4 in the starting pit 19 are repeated as appropriate.

In the case of curve construction, the strokes of the left and right propulsion jacks 3 in the open shield machine 1 are differentiated, and the propulsion jacks 3 on the side opposite to the side to be bent are further extended. The propulsion jack 3 on the opposite side is extended by being dragged by the propulsion jack 3 that extends.

Therefore, the towing jack 17 of the retraction device 18
By pulling the rod 16, the forcible jack 3 is used to forcibly reduce the rod 16 so that the open shield machine 1 can reliably bend.

Further, backfilling is performed above the concrete box 4 buried in the ground in a tandem manner. A friction cut material such as an iron plate is arranged on the upper surface of the concrete box 4, and the backfilled soil is kept as it is. Either a method of moving only the box 4 forward or a method of disposing a friction cut material by a vertical plate between the backfill soil and the ground and moving the backfill soil together with the concrete box 4 may be selected.

Further, with regard to the extrusion of the concrete boxes 4 buried in the ground in tandem, if the length is long, only the propulsion jacks 21 in the starting pit 19 are used. The extruded parts can be dispersed.

[0027]

As described above, the open shield machine of the present invention can reliably bend.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view showing an example of an open shield method using an open shield machine of the present invention.

FIG. 2 is a cross-sectional plan view showing one embodiment of the open shield machine of the present invention.

FIG. 3 is an enlarged cross-sectional plan view of a main part showing one embodiment of the open shield machine of the present invention.

FIG. 4 is a cross-sectional plan view showing fixing of a pressure receiving member.

FIG. 5 is a vertical sectional side view showing one embodiment of the open shield machine of the present invention.

FIG. 6 is a vertical sectional side view showing a digging process of the open shield method.

FIG. 7 is a vertical sectional side view showing a concrete box installation step of the open shield method.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Open shield machine 1a ... Side wall plate 1b ... Movable side plate 2 ... Blade hole 3 ... Propulsion jack 4 ... Concrete box 5 ... Backfilling 6 ... Excavator 7 ... Pressure receiving member 8 ... Partition wall 9 ... Slide jack 10 ... Pressure receiving member 11 ... Tensioning material 12 ... Fixing device 13 ... Recess 14 ... Collar 15 ... Cushioning material 16 ... Rod 17 ... Towing jack 18 ... Retraction device 19 ... Starting pit 20 ... Reaction wall 21 ... Propulsion jack

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-4-62230 (JP, A) JP-A-2-248521 (JP, A) JP-A-61-165493 (JP, A) JP-A-52-1982 15115 (JP, A) JP-B-59-29756 (JP, B2) (58) Field surveyed (Int. Cl. ⁶ , DB name) E21D 9/06 331

Claims (1)

(57) [Claims] 1. An open shield machine having a front surface, a rear surface, and an upper surface, wherein a plurality of propulsion jacks are arranged in the left and right positions on the inner side of a side wall plate in the left and right positions so as to be attached to the propulsion jacks. An open shield machine characterized by connecting the tail part side of the shield machine and the top concrete box side with a rod, and providing a pullback device that allows this rod to be pulled by a jack.