JP2002349186A - Open shield machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an open shield machine longitudinally divided into two or more pieces capable of ensuring the bent quantity of a rear jack part or tail part to surely correct the advancing direction, improving the workability in a curved part, and further surely preventing the penetration of sediment from an overlapping part (engulfment part) between front and rear divided bodies to reduce the resistance to advance of the shield machine. SOLUTION: In this open shield machine 1, the machine body is divided into front part 1d, jack part 1e and tail part 1c formed in the same machine width, the front part 1d is connected to the jack part 1e through a first propelling jack 12, and the jack part 1e is connected to the tail part 1c through a second propelling jack 13. The front part 1d is further connected to the tail part 1c through a third propelling jack 14, and inclined parts 16 tapered off forward are formed on the overlapping part of the jack part 1e with the front part 1d and the superposing part of the tail part 1c with the jack part 1e, respectively.

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 used in an open shield method for constructing underground structures such as water supply and sewerage and underground passages in an urban area.

[0002]

2. Description of the Related Art The open shield method is an efficient method utilizing the advantages of the open cutting method (open cut method) and the shield method. The outline of the open shield machine 1 used in this open shield method is shown in FIG. Left and right side walls 1a and bottom plate 1b connected to these side walls 1a
The front, rear and upper surfaces of the side wall plate 1a and the bottom plate 1b are formed as the blades, and the shield jack 2 is vertically moved toward the center or near the rear end of the side wall plate 1a. Arrange them side by side. In the figure, reference numeral 3 denotes a partition.

[0003] The open shield method using the open shield machine 1 is not shown in the drawings, but the open shield machine 1 is installed in a starting pit and the shield jack 2 of the open shield machine 1 is extended. The open shield machine 1 is advanced by applying a reaction force to the reaction wall in the starting mine, and the first concrete box 4 forming the underground structure is suspended from above, and the tail portion 1c of the open shield machine 1 is lowered. Set it behind shield jack 2 that was shortened. A strut is arranged between the shield jack 2 and the reaction force wall to adjust the distance as appropriate.

The starting pit is constituted by a retaining wall, and the retaining wall is partially mirror-cut in order to start the open shield machine 1. However, if necessary, a ground improvement is performed on a front portion of the starting pit by injecting a chemical solution or the like. May be given.

An excavator 9 such as a shovel excavates earth and sand from the front or upper surface of the open shield machine 1 and discharges the earth. Simultaneously with or after this earth removal step, the shield jack 2 is extended to advance the open shield machine 1. In the case of this advancing process, a pressing angle 8 composed of a frame using a box steel material or a mold steel is disposed in front of the concrete box 4, and the open shield machine 1 generates a reaction force from the concrete box 4 set at the rear. Take.

[0006] The first concrete box 4
Before the second concrete box 4 is suspended in the tail portion 1c of the open shield machine 1. Hereinafter, the same earth removal process, advance process, and setting process of the concrete box 4 are appropriately repeated, and the concrete box 4 is sequentially left under the ground as the open shield machine 1 advances, and the concrete box 4 is further removed. Put backfill soil 5 on the upper surface of 4.

When the concrete box 4 is hung in the tail section 1c of the open shield machine 1, a height adjusting member 7 such as a concrete block is disposed under the concrete box 4, and the tail section is provided. The grout material 6 is filled into the left and right and lower gaps of the concrete box 4 within 1c.

In this way, when the open shield machine 1 reaches the destination pit, it is removed and the construction is completed.

In such an open shield method, the concrete box 4 is connected to the open shield machine 1 as described above.
Left in the ground in tandem with the advance of
Is suspended in the tail portion 1c of the open shield machine 1, and the tail portion 1
c, and is left underground, and the open shield machine 1 moves forward by taking a reaction force to the concrete box 4 thus left underground.

The concrete box 4 is made of reinforced concrete and comprises a left side plate 4a, a right side plate 4b, an upper floor plate 4c, and a lower floor plate 4d as shown in FIG. I have.

By the way, in the open shield machine 1 in which the part including the cutting edge 11 at the front end and the tail part 1c for hanging the concrete box 4 at the rear end are integrally formed,
Curve construction was difficult because the entire aircraft proceeded in the same direction at the same time.

Further, since the concrete box 4 also serves as a reaction force body for advancing the open shield machine 1, it is required to have strength, and as a result, it is expensive.

In view of this, there has been proposed a device in which the body of the open shield machine 1 is divided into a plurality of units in the front-rear direction.
The front part 1d, the jack part 1e in which the shield jack 2 is disposed, and the tail part 1c on which the concrete box 4 is suspended are divided into three parts. Jack part 1e
The tail portion 1c and the tail portion 1c are connected by a propulsion jack, and the front portion 1d and the tail portion 1c are connected by a towing jack.

The front part 1d, which is each of the divided bodies,
The jack portion 1e and the tail portion 1c respectively take the reaction force from the other divided bodies by the extension of the propulsion jack and the towing of the towing jack, and independently travel and advance in a manner similar to the ESA method.

[0015] Therefore, each divided body can easily change its direction by itself and can perform curved construction, and it is not necessary to apply a reaction force to the concrete box on the rear side. Since no pit is required, construction is easy and the construction period can be shortened.

[0016]

Although the traction jack is used as a means for controlling the direction of the jack portion 1e, the distance between the place where the traction jack is set and the fixing point at the end of the traction member is long. However, since the towing stroke is large, the directionality is not good, and it has been difficult to secure the amount of middle folding corresponding to the construction curve.

The front part 1d, the jack part 1e,
The tail part 1c takes a reaction force from the other divided body by the extension of the propulsion jack and the towing of the towing jack, and the ESA
In the same manner as in the method of construction, each of the jacks 1e runs independently and moves forward. However, when the jack 1e is propelled, its tip enters the rear of the front 1d in a superposed state, and when the tail 1c is propelled, the tip is jacked. It enters the rear of the part 1e in a polymerized state.

Conventionally, as a structure for this polymerization,
The outer diameters of the front part 1d, the jack part 1e, and the tail part 1c are formed to be equal, and the outer diameters of only the tip parts of the jack part 1e and the tail part 1c are equal to the inner diameters of the front part 1d and the jack part 1e, respectively. The boundary between the small diameter portion and the large diameter portion is formed in a stepped portion.

For example, when the jack portion 1e is propelled, the small-diameter portion at the tip enters the large-diameter portion of the front portion 1d. Dirt and sand enters the overlapping portion (swallowing portion) of the jack portion 1e and the front portion 1d.

Therefore, as means for preventing the intrusion of earth and sand,
Conventionally, earth retaining is performed by providing a blocking plate at a point of the overlapping portion (swallowing portion), but earth and sand entering the swallowing portion with the promotion of the jack portion 1e and the tail portion 1c is in a compressed state, While the jack part 1e and the tail part 1c repeat propulsion many times, the closing plate is damaged and the earth retaining function cannot be performed. As a result, the soil compacted in this area will resist the forward movement of the shield machine.

An object of the present invention is to solve the disadvantages of the conventional example and to divide the open shield machine into a plurality of parts in the front-rear direction. The amount of breaks can be secured, the forward direction can be reliably corrected, the workability at the curved part can be improved, and the intrusion of earth and sand from the overlapping part (swallow part) between the front and rear divided bodies can be reliably prevented. To provide an open shield machine capable of reducing the resistance of the shield machine from moving forward.

[0022]

In order to achieve the above object, the present invention firstly divides a body of a vehicle into a front portion, a jack portion, and a tail portion each having the same machine width, and In an open shield machine in which a jack portion is connected by a propulsion jack and a jack portion and a tail portion are connected by a propulsion jack, the front portion and the tail portion are connected by a propulsion jack, and the jack portion and the front portion overlap. The gist of the present invention is to form an inclined portion which tapers toward the front in a portion where the portion and the tail portion and the jack portion overlap each other.

Secondly, the gist of the invention is to attach a steel material having elasticity for preventing earth and sand from entering the overlapping portion.

According to the first aspect of the present invention, when the curved portion is constructed, the front portion and the jack portion are in a state of being directly connected by the pin jack, which is stronger than the case of using the traction jack. Can be returned, and the amount of folding can be secured. In addition, since the inclined portion is formed in the overlapping portion of the front and rear divided bodies, the earth and sand that is going to enter the overlapping portion during the propulsion of the divided body moves along the inclined portion,
Run away from the open shield machine. Therefore, it is possible to prevent earth and sand from entering from the overlapping portion.

According to the second aspect of the present invention, in addition to the above operation, the steel material can more reliably prevent the intrusion of sediment, and since the steel material has elasticity, the function of preventing the intrusion of sediment following the propulsion of the divided body. Can be fulfilled effectively.

[0026]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a plan view showing an embodiment of the open shield machine of the present invention, FIG. 2 is a vertical sectional side view of the same, and the basic configuration of the open shield machine 1 is as described above with reference to FIG. Since a jack is provided and the front, rear and top surfaces are open, detailed description thereof will be omitted.

The open shield machine 1 according to the present invention divides the fuselage into a plurality in the front-rear direction.
Is divided into three parts: a front part 1d having a front end, a jack part 1e, and a tail part 1c on which the concrete box 4 is hung. A first part is provided between the front part 1d and the jack part 1e.
, A second propulsion jack 13 is disposed between the jack portion 1e and the tail portion 1c, and a third propulsion jack 14 is disposed between the front portion 1d and the tail portion 1c. Pin jacks are used for the propulsion jacks 12, 13, and 14.

Then, the front part 1d and the jack part 1
e, the outer diameter of the body of the tail portion 1c is formed to be equal, and then, as shown in FIG. 3, the overlapping portion of the jack portion 1e and the front portion 1d, which is the tip portion of the tail portion 1c, and the jack portion 1e ( The outer diameter of the swallowing portion is formed to be small so as to be equal to the inner diameter of the front portion 1d and the inner diameter of the jack portion 1e, respectively, and the boundary between the small diameter portion 15 and the large diameter portion is formed in the inclined portion 16. In the figure, reference numeral 17 denotes a round bar for securing the clearance of the overlapped portion. The member for ensuring the clearance is not limited to the round steel as shown in FIG. 3A, but may be an iron plate 20 having a half-moon cross section as shown in FIG. 3B. In addition, in order to prevent the front end of the rear divided body from hitting the front divided body in the overlapping section at the time of the curved construction section, as shown in FIG. It may be formed in the portion 21.

A spring steel 18, which is a steel material having elasticity, is interposed at an end portion of the inclined portion 16 as an entry preventing member for further preventing the entry of earth and sand.

In the figure, reference numeral 19 denotes a friction cutter jack for advancing a friction cutter disposed at the bottom of the front portion 1d.

The open shield method using such an open shield machine 1 is as shown in FIG. 9 as an outline of the entire method, and detailed description is omitted. As a first step, a concrete box 4 is laid in the tail part 1c as shown in FIG. 4, and then as a second step, as shown in FIG.
The friction cutter jack 19 disposed at d is extended to advance the friction cutter.

Thereafter, as a third step, as shown in FIG. 6, the first propulsion jack 12 is extended, and only the front portion 1d is advanced by the stroke of the first propulsion jack 12.
At this time, the first propulsion jack 12 is connected to the rear jack portion 1.
e, and the frictional resistance of the tail portion 1c due to its own weight and the earth pressure is extended as a reaction force.

When the front part 1d is dug, the friction cutter is already laid in the forward direction, so that the front part 1d moves forward on the friction cutter, which is compared with the case where the front part 1d moves on the ground. As a result, the frictional resistance is reduced, so that propulsion is possible even if a large reaction force cannot be obtained. At this time, the friction cutter jack 19 is set in the relief state, and is returned at the same speed as the propulsion speed of the front portion 1d.

Next, as a fourth step, as shown in FIG. 7, the second propulsion jack 13 is extended to advance the jack portion 1e in the direction of the front portion 1d. At this time, jack part 1
As e moves forward, the earth and sand from the surrounding ground tries to enter the swallowing part with the front part 1d, but the swallowing part has an inclined part 16 formed therein.
It moves to the outside of the open shield machine 1 along the inclination of 16, and is prevented from entering the swallowing part. Further, the spring steel 18 provided here also more reliably prevents entry. Thereby, when the open shield machine 1 is propelled, resistance to forward movement due to the earth and sand compressed in the swallowing portion is reduced.

When the jack portion 1e moves forward, the first propulsion jack 12 is set in a relief state, and the jack portion 1e is moved.
Return at the same speed as the propulsion speed. Also, a second propulsion jack
With 13 extension strokes, the amount of middle bending can be secured and the forward direction can be corrected.

As a fifth step, the tail portion 1c is advanced by the second propulsion jack 13 and the third propulsion jack 14, as shown in FIG. At this time, the tail portion 1c is directly connected to the front portion 1d by the third propulsion jack 14, so that the tail portion 1c can be easily retracted.

The above steps are repeated to lay the concrete box 4.

[0038]

As described above, the open shield machine of the present invention is obtained by dividing the open shield machine into a plurality of parts in the front-rear direction. Can secure the amount of breakage, and can reliably correct the forward direction, improve workability in curved sections, and reliably prevent intrusion of earth and sand from the overlapping section (swallowing section) between the front and rear divided bodies As a result, the resistance to the forward movement of the shield machine can be reduced.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of an open shield machine of the present invention.

FIG. 2 is a vertical sectional side view showing an embodiment of the open shield machine of the present invention.

FIG. 3 is a plan view of a main part showing an embodiment of the open shield machine of the present invention.

FIG. 4 is a plan view showing a first step of the open shield method using the open shield machine of the present invention.

FIG. 5 is a plan view showing a second step of the open shield method using the open shield machine of the present invention.

FIG. 6 is a plan view showing a third step of the open shield method using the open shield machine of the present invention.

FIG. 7 is a plan view showing a fourth step of the open shield method using the open shield machine of the present invention.

FIG. 8 is a plan view showing a fifth step of the open shield method using the open shield machine of the present invention.

FIG. 9 is a plan view showing an outline of an open shield method.

FIG. 10 is a perspective view of a concrete box.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Open shield machine 1a ... Side wall plate 1b ... Bottom plate 1c ... Tail part 2 ... Shield jack 1d ... Front part 1e ... Jack part 3 ... Partition wall 4 ... Concrete box 4a ... Left side plate 4b ... Right side plate 4c ... Top floor plate 4d ... Lower floor plate 5 ... Backfill soil 6 ... Grout material 7 ... Height adjusting material 8 ... Push angle 9 ... Excavator 10 ... Opening 11 ... Cutting hole 12 ... First propulsion jack 13 ... Second propulsion jack 14 ... Third Propulsion jack 15… Small diameter part 16… Slope part 17… Round steel 18… Spring steel 19… Friction cutter jack 20… Iron plate 21… Tapered part

Claims (2)

[Claims] 1. The machine body is divided into a front portion, a jack portion, and a tail portion each having the same machine width,
In an open shield machine in which a front part and a jack part are connected by a propulsion jack, and a jack part and a tail part are connected by a propulsion jack, the front part and the tail part are connected by a propulsion jack, and the front part of the jack part is formed. An open shield machine characterized in that an inclined portion that tapers toward the front is formed in an overlapping portion of the tail portion and a jack portion of the tail portion. 2. The open shield machine according to claim 1, wherein a steel material having elasticity for preventing sediment intrusion is attached to the overlapping portion.