JPS589235B2 - Shield Kutsushinki - Google Patents

Description

[Detailed Description of the Invention] This invention is constructed by movably connecting a hood part (head part), a ring garter part (body part), and a tail part (tail part) inside a sheet pile divided into a plurality of parts in the propulsion direction. Incorporate the support,
The present invention relates to a shield excavator in which each of the sheet piles is slidably supported by each component of a support body that is divided into three parts.

Conventionally, this type of shield excavator has been used, for example, in the
21 etc. are known, and these shield tunneling machines are
The skin plate was formed by a plurality of sheet piles divided horizontally with respect to the direction of propulsion, and the face was excavated by sequentially propelling the plurality of sheet piles one by one using each jack of the internal support. .

However, the support (mechanical structure) that supports the sheet pile of such a shield excavator has a structure in which it is supported almost inside the longitudinal center of the skin plate, so when the sheet pile is excavated, the sheet pile is Extreme soil loads were applied to the tip, often causing the sheet pile to be damaged or deformed.

In addition, since the sheet pile is formed horizontally to the direction of propulsion, and the support is also formed in a cylindrical shape, excavation can only be carried out in the straight direction. Therefore, in cases where bent excavation is required to promote the work. In this case, the excavator had to be moved in accordance with the direction, which caused problems in terms of work efficiency.

This invention eliminates the above-mentioned conventional drawbacks,
It is an object of the present invention to provide a shield excavator which reinforces and supports the tip of a sheet pile and is capable of performing straight excavation and bending excavation.

Embodiments of the present invention will be described below based on the accompanying drawings.

1 to 3, reference numeral 1 denotes a skin plate of a shield tunneling machine, and this skin plate 1 includes a plurality of skin plates (this invention In the example, the sheet pile 2a is divided into 8 sheets).
~2h is formed into a cylindrical shape.

The tip 3 of each of the sheet piles 2a to 2h is formed into a sharp point so that it can easily penetrate into the soil, and the portion in front of the mounting portion of the sheet pile jacks 12a to 12h, which will be described later, is compressed by the compressive force that occurs when penetrating into the soil. It is manufactured from a steel structure having a section modulus sufficient to withstand the above conditions, and a bracket 4 to which a sheet pile jack is mounted is provided on the back surface on the center line of the sheet pile.

This bracket 4 has a structure in which sheet pile guides 8 and 9 provided on a hood portion (head) 6 and a ring gutter portion (body) 7 of a support body 5, which will be described later, are fitted.

In addition, a skin plate 1 consisting of a plurality of sheet piles 2a to 2h
A support body 5 that slidably supports each of the sheet piles 2a to 2h is installed inside, and this support body 5 has three parts: a hood part 6, a ring gutter part 7, and a tail part 10. These are composed of a ring garter part 7, a hood part 6 in front of it (on the left side in the figure), and a tail part 10 behind it (on the right side in the figure). A plurality of hood jacks 1 provided on the inner peripheral surface of the gutter portion 7
It is pin-coupled to one end of 1a to 11h, and the tail part 10
is integrated with the ring garter part 7 by bolting via a flange, and the tail part 10 is attached to the ring garter part 7 as needed.
is removable.

The sliding parts of the plurality of sheet piles 2a to 2h that are always slidably supported by the movably integrated support body 5 are the sheet pile guides 8 provided on the outer surfaces of the hood part 6 and the ring gutter 7. ，
9 is engaged with a bracket 4 provided on the back surface of each sheet pile 2a to 2h, and each sheet pile 2a to 2h moves following the movement of the movable support 5, and prevents it from falling off from the support 5. Prevented.

Further, a plurality of sheet pile jacks 12a to 12h are provided between each sheet pile 2a to 2h and the ring gutter portion 7,
One end of the sheet pile jacks 12a to 12h is pin-coupled to the outer wall of the ring gutter section 7, and the other end is connected to the sheet pile jack 12a to 2h.
The horizontal movement of the sheet piles 2a to 2h during penetration is performed by the expansion and contraction operations of the sheet pile jacks 12a to 12h.

Next, the hood part 6 of the support body 5 is constructed partially independently.
, the ring gark portion 7, and the tail portion 10.

(B) Hood part (head) As shown in Figures 1 and 2, the hood part 6 is made up of a plurality of steel plates of a predetermined width that are integrally formed into a cylindrical shape by welding or the like, and the outer peripheral surface is slightly It is shaped like a trumpet that spreads forward.

The outer peripheral surface of this hood part 6 comes into contact with the inner surface of the sheet piles 2a to 2h via the sheet pile guide 8, and constantly supports the earth pressure applied to each sheet pile 2a to 2h, and also supports the penetration direction of each sheet pile 2a to 2h. The sheet pile guide 8 is provided for controlling the sheet piles 2a to 2h and preventing the sheet piles 2a to 2h from falling off.

Further, the inner surface of the hood portion 6 has a conical shape with a tip edge, and has a predetermined rigidity, and a bracket 13 provided inside also serves as a reinforcing lip.

The rear end of the hood portion 6 facing the ring girdle 7 is concentrically flush with the front surface of the ring gutter portion 7, and the hood portion 6 and the ring gutter portion 7 are connected to the hood jacks Ila to 11h.
The structure is such that the hood part 6 can be eccentrically moved vertically and horizontally about the center of the ring gark part 7 by means of a portable jack (not shown).

When the sheet piles 23 to 2h penetrate forward (to the left in FIG. 1), the hood portion 6 moves in the same direction by the operation of the hood jacks 11a to 11h according to the situation of the face, and each sheet pile 2a ~2h supported, sheet pile 23~2h
At the same time, this prevents overhang due to penetration of the front face and collapse of the front face.

In addition, a portable jack (not shown) takes a reaction force to the ring garter part 7 to decenter the hood part 6 vertically and horizontally, while the direction of the hood part 6 is changed and tilted by sequentially stepwise expansion and contraction operations of the hood jacks 11a to 11h. , the bending of the support frame 5 serving as the core, and the sheet piles 2a to 2 guided by it.
Due to the flexibility of h, the penetration direction of the sheet piles 23 to 2h is displaced to enable bending excavation.

(b) Ring gutter section The ring gutter section 1 is formed of a steel plate in an annular shape as shown in Figs. 2 and 3, and its front and rear ends are made of a ring-shaped steel plate welded structure that maintains a predetermined rigidity. The rings at the front and rear ends are firmly welded and integrated along the dividing lines of the sheet piles 23 to 2h by longitudinal beams 14 made of shaped steel of the same number as the number of divisions.

On the outer surface of this longitudinal beam 14, there is a liner 15 that supports each sheet pile 2a to 2h, and a sheet pile guide 8 provided in the hood part 6.
A sheet pile guide 9 is provided on the rear extension line of
Further, on the inside of the vertical beam 14, a coupling bracket 16a for the hood jacks 11a to 11h that moves the hood portion 6 is attached.

Furthermore, a bracket 16b for connecting one end of the sheet pile shacks 12a to 12h and a reaction force receiving bracket (not shown) for eccentrically centering the hood part 6 are appropriately provided in the middle of the arranged longitudinal beams 14, and a front end ring The surface that connects to the hood part 6 is provided with through holes 17 for the hood jacks 11a to 11h, and the surface that connects to the tail part 10 of the rear end ring is provided with bolt connection holes 18. Although not shown in the drawings, in the primary lining electrical equipment, the ring gark portion 7 formed in this manner, which attaches the rear end ring to the base, is located at the center of the support body 5, and all the operating mechanisms of the present invention are It is installed in the support body 5 and serves as a base point in the excavation direction.

(C) Tail part The tail part 10 is formed into a cylindrical shape from a single steel plate, similar to the conventional skin plate integrated type, and its front surface is concentrically fitted to the rear surface of the ring gark part 7 by bolt connection using a flange. There is.

Further, a tail packing 19 is attached to the rear end along the circumference.

As shown in Fig. 2, the outer diameter of the tail portion is the same as sheet piles 2a to 2h.
It is formed to be thicker than the outer diameter of the hood part 6 and ring gutter part 7 to correspond to the inner diameter of the sheet pile jacks 12a to 12h, and its length is longer than the length required for assembling the conventional primary lining segment. The part corresponding to the head of the figure has been shortened.

This tail portion 10 can not only be used for conventional segment assembly work, but also can be used at all times from the sheet pile 23 to the outer circumferential surface.
Since it supports the rear end of 2h and constitutes a bulkhead for the movable sheet piles 23 to 2h, segment assembly work can be carried out simultaneously while the sheet piles 2a to 2h are being penetrated, and even while the support body 5 is being moved. .

In addition, in the case of sharply bending excavation, by adjusting the bolts (not shown) used for coupling with the ring gark portion 7, the support body 5 serving as the core can be bent to easily cope with the sharply bending excavation.

As mentioned above, the support body 5 is composed of the above three elements, or the front of the sheet pile jacks 12a to 12h in the sheet piles 2a to 2h supported by the support body 5 is the hood part 6.
, are supported by the ring garter part 7, and the outer circumferential surfaces of the rear parts of the sheet pile jacks 12a to 12h are formed of a single steel plate that is the same as the outer circumferential surface of the front part, and are always in sliding contact with the outer circumferential surface of the tail part 10. .

The thickness of this portion is determined in order to minimize the gap that occurs between the outer peripheral surface of the tail portion 10 and the face after the penetration of the sheet piles 2a to 2h, and to reduce the movement resistance of the integrated support 5. Selected based on the required gap.

Note that the tail portions of the sheet piles 2a to 2h may be connected with pins to the front portions of the sheet piles 2a to 2h to facilitate bending.

As described above, the sheet piles 23 to 2h cover the entire support 5 to prevent the intrusion of earth and sand from the outer periphery of the support, and to horizontally move along the guides 8 and 9 provided on the support 5 while supporting the earth load. In addition to performing penetration excavation of the front face and guiding the forward movement of the support body 5, it also serves to transmit the movement reaction force to the earth pressure when the support body 5 moves.

FIG. 6 shows another embodiment showing how the sheet piles 2a to 2h are attached, in which the vertical beam 14' is formed in a mountain shape as shown in the figure, and the sheet piles are attached to the ring gak portion 7' via the vertical beam 14'. 23'
~2h' is attached.

The operation of the present invention constructed as described above will be explained separately for the case of straight excavation and the case of bent excavation.

(A) In the case of straight excavation (Fig. 4 A to 2), a plurality of sheet piles 23 to 2h supported by a movably connected and integrated support body 5 consisting of three component parts are checked according to the soil condition and the direction of propulsion. While taking this into consideration, move it into the front face (left side in the figure) either singly or symmetrically as shown in Figure 4A.

In this case, each sheet pile 2a to 2h is moved individually to the individual sheet piles 23 to 2.
Activate each sheet pile jack 12a to 12h attached to h (
The reaction force of the sheet piles 2a to 2h at this time is received by friction due to earth pressure in contact with the outer peripheral surfaces of the other sheet piles 2b to 2h that are not moved through the support body 5.

When the required number or all of the installed sheet piles 2a to 2h have penetrated, as shown in the opening in FIG.
is moved forward in the direction of the arrow by the operation of the hood jacks lla to 11h, and the penetrating sheet piles 2a to 2h are overhanged.
The hood part 6 supports the tip of the front face and prevents collapse of the front face due to excavation of the face in the area where the sheet piles 2a to 2h have penetrated.
prevent in front of.

In addition, the penetration range of the sheet piles 23 to 2h and the movement range of the hood portion 6 are determined by the sheet pile jacks 12a to 12h depending on the condition of the face.
This is done by appropriately adjusting the strokes of the hood jacks 11a to 11h.

Furthermore, the reaction force during movement of the hood part 6 is obtained by the frictional force between the outer surface of the sheet pile and the earth and sand that comes into contact with it via the ring gark part 7.

From this state, as shown in Figure 4, opening and c, the sheet pile jacks 12a to 12h are operated (contracted) at the same time to move the ring gutter section 7 and the tail section 10 to the hood section 6.
simultaneously move forward by the space L1 created behind.

In this case, the hood jacks 11a to 11h are set in a free state so that no resistance is generated when the ring garter part 7 moves, and the reaction force when the ring garter part 7 and the tail part 10 are moved is controlled by the sheet pile jacks 12a to 12h. It is received by the earth pressure which is in contact with the outer surface of all the sheet piles.

As described above, the penetration of the sheet piles 23 to 2h, the forward movement of the hood part 6, the movement of the ring gak part 7, and the tail part 10 are repeated, and the tail part 10 is moved as shown in FIG.
A space L2 corresponding to the primary lining segment is formed inside, and a new segment is assembled in this space L2 using an erector device (not shown).

The narrow tail part 10 has a rolled structure of a single plate with a predetermined width, and always supports the sheet piles 23 to 2h, is completely isolated from the face even if the sheet piles move, and includes the tail part 10. Even while the support body 5 is moving, it does not interfere with the existing segments, so
Assembling of newly installed segments can be carried out even during excavation.

When performing straight excavation, the above operations are repeated.

(B) Bent excavation (Fig. 5 A to C) As shown in Fig. 5 A, after the hood part 6 is advanced a predetermined distance, a plurality of portable jacks (not shown) are used to
The hood part 6 is made eccentric from the ring gutter part 7, the sheet piles 2a to 2h are displaced via the sheet pile guide 8, and then each of the sheet piles 2a to 2h is penetrated in the same way as in straight excavation.

In other words, by tilting the hood part 6 in the bending direction as shown in Figure 5, and moving the ring gutter part 7 and the tail part 10, the shield excavator as a whole takes the bent excavation posture as shown in Figure 5C. enter.

If the degree of bending during excavation is severe, adjust the connecting bolt between the ring garter part 7 and the tail part 10 to bend the tail 10' in the bending direction when entering the above-mentioned bent excavation position, so that the tail 10' is bent within the elastic limit of the sheet pile. Along the deformation of the sheet piles 2a to 2h,
The support body 5, which becomes the core, is advanced.

Note that the tail portions 10 of the sheet piles may be connected with pins so that the sheet piles 2a to 2h can easily follow the bending of the support body 5.

As described above, in the case of bent excavation, as in the case of straight excavation, segments are created using the erector device in the space after the forward movement of the ring gutter section 6 and the tail section 7.

The present invention has the above-mentioned structure, and the support body of the shield tunneling machine, which was conventionally integrated with a rigid structure, is composed of three elements: a hood part, a ring gark part, and a tail part,
Since they are movably connected, the hood part of the support can be moved independently to reduce the overhang of the penetrating sheet piles and prevent the sheet piles from being damaged or deformed due to soil loads.
In addition to serving as a retaining device to prevent the front face from collapsing, it also allows for easy bending in the soil by combining the movable displacement of the rear tail section with eccentric and tilting operations.

In addition, the tail part is completely independent and always isolated from the face even when the sheet pile is moving, and each jack is in a position where it does not get in the way when the shield excavator moves forward, so the primary lining does not affect the progress of excavation. It can be done safely.

Furthermore, since each part of the sheet pile and support body forming the main body of the shield tunneling machine is movably connected to each other, the driving force of each part is small compared to the propulsion force of a conventional shield tunneling machine. Since the dimensions can be selected as appropriate without being restricted by the width of the segment to be constructed, the length dimension relative to the outer diameter of the shield excavation machine body becomes small, which, in combination with the bending of the support, makes bending excavation very advantageous. There is.

[Brief explanation of the drawing]

The attached drawings show an embodiment of the present invention; FIG. 1 is a plan view, FIG. 2 is a longitudinal cross-sectional view taken along line 1--2 in FIG. 1, and FIG. A to 2 of FIG. 4 are schematic longitudinal sectional side views for explaining the construction method sequence of this invention, and FIG.
Figures A to C are schematic side views illustrating the excavation state of the present invention, and FIG. 6 is a half sectional view showing another embodiment of the attached state of the sheet pile. 1...Skin plate, 2a-2h...
- Sheet pile, 3...Tip of sheet pile, 4...Bracket, 5...Support, 6...Hood part, 7... Ring garter part, 8, 9...
...Sheet pile guide, 10...Tail part, 11a~
11h...Hood jack, 1-2a~12h
... Sheet pile jack, 13 ... Bracket, 14 ... Longitudinal beam, 15 ... Liner,
17...Through hole, 18...Bolt connection hole,
19...Tail packing.

Claims (1)

[Claims] 1 Inside a skin plate formed by arranging a plurality of sheet piles divided in the propulsion direction in a cylindrical shape, a support body connected to each sheet pile of the skin plate through each jack is installed so as to be relatively slidable. In the shield tunneling machine, the support body is composed of a hood part (head), a ring gutter part (body part), and a tail part (tail part), and the hood part is moved forward and backward into the ring gutter part via a jack. A shield excavator, characterized in that the tail section is movably coupled to the ring gutter section, and the skin plate is slidably supported by each component of the support body.