JP3069619B2 - 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 a shield machine used for a cast-in-place lining method.

[0002]

2. Description of the Related Art A tunnel is constructed by directly casting concrete on a hole wall immediately after excavation by a shield machine.
Cast-in-place lining methods have been developed. In this type of tunnel, it is important to ensure the water stopping property of the skeleton, and conventionally, the following method is used. One is a method in which the inside of the primary lining (lining) is covered with a waterproof sheet, the secondary lining is cast inside the waterproof sheet, and a waterproof film is formed inside the tunnel frame. . Another method is to place a waterproof sheet in the tail plate of a shield machine, cast concrete inside the waterproof sheet while pulling out the waterproof sheet, and cover the outer peripheral surface of the tunnel body with the waterproof sheet. It is.

[0003]

Problems to be Solved by the Invention The above-mentioned conventional water stopping technology has the following problems. <B> In the former method, concrete needs to be poured separately into primary and secondary operations, which imposes a heavy burden in terms of construction period and construction cost. In addition, since the thickness of the lining is increased by the number of linings, the outer diameter of the entire tunnel must be designed to be large, which increases the amount of soil excavation and the amount of concrete poured, which is uneconomical. <B> In the latter method, since the waterproof sheet intervenes between the tail plate and the cast concrete in a crimped state, the waterproof sheet is torn by frictional resistance when the shield machine advances. It is difficult to secure a sufficient water stopping effect.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to provide a shield machine which is excellent in workability and can avoid breakage of a waterproof sheet. Still another object of the present invention is to provide a shield machine capable of reducing the propulsion resistance between the shield machine and the lining.

[0005]

That is, according to the present invention, a space is defined by assembling an inner form in a tail plate of a shield machine in opposition to an inner peripheral surface of the tail plate. After placing concrete inside the tunnel, pressurize to build the tunnel frame, obtain the reaction force from the inner formwork, and move forward to the face side by placing a reinforcing ring between the tail plate and the inner formwork. The reinforcing ring comprises a double cylinder of a cylindrical outer ring that slides with each other and an inner ring that can be expanded and contracted by fitting both ends of a plurality of arc panels into a cylindrical shape. An opening along the tunnel axis direction is provided on the opposing surfaces at both ends of the arc panel , and the outer ring
A guide that engages with the opening of the arc panel is provided, and at least one of the inner ring and the outer ring is provided with sliding means for relatively sliding the inner ring and the outer ring in the tunnel axis direction, and the guide of the outer ring and the opening of the inner ring are provided. A shield excavator characterized in that an inclined surface for reducing and increasing the inner diameter of the inner ring by a relative sliding motion of both rings is formed on the facing surface. Further, according to the present invention, a space is defined by assembling an inner formwork in the tail plate of the shield machine facing the inner peripheral surface of the tail plate, and concrete is poured into the defined space and then pressurized. In the shield excavator, which constructs a tunnel frame and moves forward to the face side by receiving a reaction force from the inner formwork, a waterproof sheet for covering the outer periphery of the tunnel frame is continuously connected between the tail plate and the tunnel frame. The reinforcing ring is arranged between the tail plate and the water-stop sheet, and the reinforcing ring is formed by fitting both ends of a cylindrical outer ring and a plurality of arc panels that slide with each other. constitute a double tube with a collapsible inner ring to Jo, provided with an opening along the tunnel axis to the opposed surfaces of both ends of the circular arc panels, the outer ring, gas to be engaged with the opening of the arcuate panel A sliding means for relatively sliding at least one of the inner ring and the outer ring in the tunnel axial direction, and providing a relative surface between the two rings on a surface facing the guide of the outer ring and the opening of the inner ring. A shield machine in which an inclined surface for reducing and increasing the inner diameter of the inner ring is formed by sliding motion.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. <A> Formwork system FIG. 1 shows a cross-sectional view of the tail plate 1 of the shield machine, and FIG. 2 shows a vertical cross-sectional view thereof. According to the shield excavator of the present invention, when the concrete is cast in the shield excavator, the inside of the tunnel body 3 is formed with the annular inner form 2 and the outer periphery of the tunnel body 3 is made of a flexible waterproof sheet 4. In a form formed by covering with a propulsion jack 11 for propelling a shield machine by obtaining a reaction force from the inner mold 1 and a space between the inner mold 2 and the bag-shaped waterproof sheet 4. And a press jack 12 for dehydrating the pressurized concrete under pressure. Further, the present invention includes a scalable reinforcing ring 5 interposed between the water-stop sheet 4 and the tail plate 1 in order to prevent the water-stop sheet 4 from protruding when the concrete is pressurized. Hereinafter, each part will be described in detail.

<B> Water-Stop Sheet The water-stop sheet 4 is a well-known waterproof bag-like sheet that covers the entire outer periphery of the tunnel frame 3 and is accommodated so that it can be continuously pulled out from inside the shield machine to outside the shield machine. ing. In some cases, the water stop sheet 4 may be omitted.

<C> Reinforcing Ring The reinforcing ring 5 is a member for reinforcing the water-stop sheet 4 and is composed of a double cylinder of an outer ring 6 and an inner ring 7. The outer ring 6 is a tubular body having both ends open, and guides 61 having a T-shaped cross section are protruded at a plurality of locations on the inner peripheral surface thereof along the tunnel axis direction. Inner ring 7 is guide 6
The inner ring 7 is divided into a plurality at one position, and both ends of each arc-shaped inner ring 7 are fitted to the guide 61, so that the overall shape is circular.
The reinforcing ring 5 is configured such that the inner diameter of the inner ring 7 expands and contracts by the relative sliding movement of the two rings 6 and 7.

<D> Outer ring The outer ring 6 is, as shown in FIG.
Is connected to the slide jack 13 disposed in the shield machine and slides in parallel with the tunnel axis direction.
As shown in FIG. 3, the guide 61 having a T-shaped cross section includes a protrusion 62 protruding from the inner peripheral surface of the outer ring 6, and a protrusion 62.
And projecting portions 63 projecting to both sides of the projecting portion 62 at the tip of the projection 62. Outwardly inclined surfaces 64 whose thickness gradually increases toward the wellhead side are formed at regular intervals on the surface of each overhang portion 63 on the side facing the inner peripheral surface of the outer ring 6.
Further, a plurality of inwardly inclined surfaces 65 are formed at regular intervals along the circumferential direction of the outer ring 6 on the inner peripheral surface of the outer ring facing the projecting portion 63. The inward inclined surface 65 is formed so as to gradually increase in thickness toward the face. The formation positions of these inclined surfaces 64 and 65 are shifted with respect to the tunnel axis direction, but the formation pitch is the same. The outwardly inclined surface 64 contacts a smooth inner peripheral surface of an upper jaw 72 of the inner ring 7 described later, and the inwardly inclined surface 65 contacts an outwardly inclined surface 74 of the inner ring 7 described later. The above-described slopes may be combined in the opposite direction.

<E> Inner Ring The inner ring 7 is composed of a plurality of arc panels obtained by dividing a cylindrical body into a plurality of sections along the tunnel axis direction. As shown in FIG. 3, the end of each arc-shaped inner ring 7 has an opening having a width capable of inserting the overhang portion 63 including the outwardly inclined surface 64, and both sides of this opening. Are formed with an inner jaw 71 and an outer jaw 72. The outer jaw 72 is set shorter than the inner jaw 71 so that the protruding length of the jaws 71, 72 forms a continuous inner peripheral surface with no gap when the inner ring 7 is reduced in diameter.
In addition, the inner jaw 71 is set such that the end face thereof abuts when the inner ring 7 is reduced in diameter so that a continuous surface without any gap can be formed. In the middle of the outer jaw 72, a notch 73 is provided at regular intervals.
Has been established. The notch 73 allows the outwardly inclined surface 64 to pass therethrough. A plurality of outwardly inclined surfaces 74 are formed at regular intervals on the outer peripheral surface of the outer jaw 72 on both sides of each notch 73 along the circumferential direction. The outwardly inclined surface 74 is set at an inclination angle corresponding to the inwardly inclined surface 65. As shown in FIG. 2, the inner ring 7 is fixed in the shield machine in such a manner as to permit expansion and contraction. Although illustration is omitted in the drawings, the outer ring 6 and the inner ring 7 constituting the reinforcing ring 5 are illustrated.
Between the opposing peripheral surfaces and the tail plate and outer ring 6
Sealing members for preventing the backing material from entering are disposed between the opposing peripheral surfaces.

[0011]

Next, a method of constructing a tunnel using a reinforcing ring will be described. <A> Reinforcement Ring Set (Reduced Diameter) As shown in FIG. 2, the reduced diameter reinforcement ring 5 is arranged inside the tail plate 1, and the water blocking sheet 4 is arranged on the inner peripheral surface of the reinforcement ring 5. Then, the inner mold 2 is assembled inside the waterproof sheet 4. The method of assembling the reinforcing ring 5 is as follows. The slide jack 13 is extended with respect to the fixed inner ring 7, and the outer ring 6 is slid toward the wellhead side. Outer ring 6 to inner ring 7
When pushed inward, the inwardly inclined surface 65 is
, The inner ring 7 is gradually reduced in diameter as the pushing of the outer ring 6 proceeds. Each inner ring 7 continues to reduce its diameter until the opposing end faces of the inner jaws 71 abut against each other and there is no gap in the inner peripheral surface of the inner ring 7. By simply sliding and setting the outer ring 6, the inner diameter of the inner ring 7 is simultaneously set to the minimum diameter.

<B> Casting concrete Next, as shown in FIG. 2, after closing the face side of the space defined by the waterproof sheet 4 and the inner mold 2, concrete is press-fitted into this space and the tunnel frame is formed. Extend 3 At this time, the reinforcing ring 5 remains reduced in diameter. Next, the press jack 12 is extended to press the concrete and dewater the concrete. Pressure by pressing jack 12 is inner mold 2 acts trying Daso conceive outward in waterproofing sheet 4 of course. Since the inner mold 2 is a rigid body, it can sufficiently oppose this pressing force. The pressing force acting on the waterproof sheet 4 is
Since the reinforcing ring 5 is supported by the outer ring 6 of the reduced diameter state, the water stopping sheet 4 does not need to be deformed at all.

<C> Propulsion (expansion) When the shield machine is advanced with the reinforcement ring 5 reduced in diameter after the concrete has hardened, the propulsion force is attenuated by the frictional resistance between the reinforcement ring 5 and the tunnel frame 3. In addition, there is a risk that the water stop sheet 4 will be broken. Therefore, as shown in FIG. 4, prior to the advance of the shield machine, the diameter of the reinforcing ring 5 is expanded by the following operation. First, the outer jack 6 is slid to the face side by contracting the ride jack 13. Then, the contact between the inclined surfaces 65, 74 of the rings 6, 7 is released from the state shown in FIG. 2 to the state shown in FIG.
At the same time, the outwardly inclined surface 64 of the guide 61 scoops up the inner peripheral surface of the upper jaw 72 of the inner ring 7. As a result, the inner ring 7 is gradually pushed outward while the divided inner ring 7 gradually expands in the circumferential direction, and the inner diameter of the entire inner ring 7 increases. Since the outer jaw 72 of the inner ring 7 is engaged with the guide 61, there is no fear that the inner ring 7 will come off the guide 61 even if the inner ring 7 expands in the circumferential direction. In this way, the diameter of the reinforcing ring 5 is expanded, and the shield machine is advanced in a state where the edges of the reinforcing ring 5 and the waterproof sheet 4 are cut off. Since the water-stop sheet 4 and the tunnel body 3 are not in direct contact with the movable members such as the reinforcing ring 5 and the tail plate 1, the water-stop sheet does not need to be torn by the forward movement of the shield machine, and the propulsive force of the propulsion jack 11. Need not be attenuated. The above steps are repeated to extend the tunnel.

[0014]

As described above, the present invention has the following effects.

<A> Suitable for outer ring and inner ring
The inner ring can be set in a reduced diameter state simply by performing a paired sliding movement .

[0016] In the so <br/> Rukoto relatively sliding movement toward a <b> outer ring and the inner ring in a direction opposite to the contraction径時can be automatically expanded to the inner ring.

<C> The shield excavator can move forward with the reinforcing ring expanded in diameter and insulated from the waterproof sheet.
The propulsion of the shield machine does not need to be attenuated.

<D> Since the diameter of the reinforcing ring is increased and the shield excavator can be moved forward while being insulated from the waterproof sheet,
There is no need to worry about breaking the waterproof sheet. Therefore, the reliability against water stoppage is improved.

<E> The water-stop sheet corresponding to the concrete outer formwork is very economical because the water-stop sheet having no rigidity can be used because its outer periphery is surrounded by the reinforcing ring.

<F> The construction can be easily performed even on softly standing ground.

<G> A clearance can be provided between the tail plate and the reinforcing ring. for that reason,
A curved construction with a small curvature becomes possible.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a tail plate portion of a shield machine according to the present invention.

FIG. 2 is a vertical sectional view of an upper portion of a tail plate.

FIG. 3 is a perspective view of an outer ring and an inner ring constituting a reinforcing ring.

FIG. 4 is a longitudinal sectional view of a reinforcing ring at the time of diameter expansion.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tadao Hirayo 1-25-1, Nishi-Shinjuku, Shinjuku-ku, Tokyo Inside Taisei Corporation (72) Inventor Toshihiko Bessho 1--25, Nishi-Shinjuku, Shinjuku-ku, Tokyo No. 1 Inside Taisei Corporation (72) Inventor Shuichi Hara 1-1-11-25 Higashioi, Shinagawa-ku, Tokyo Goyo Construction Co., Ltd. (72) Inventor Kazuo Tsuda 1-Higashioi, Shinagawa-ku, Tokyo 11-25 Goyo Construction Co., Ltd. (72) Katsumi Tamura 2-6-2 Otemachi, Chiyoda-ku, Tokyo Hitachi Construction Machinery Co., Ltd. (72) Yukihisa Hirasawa Otemachi, Chiyoda-ku, Tokyo 2-6-2 Hitachi Construction Machinery Co., Ltd. (72) Inventor Nobuyuki Maehara 2-6-1 Otemachi, Chiyoda-ku, Tokyo Hitachi Construction Machinery Co., Ltd. (58) Fields surveyed (Int. Cl. ⁷ , (DB name) E21D 11/10 E21D 11/38

Claims (2)

(57) [Claims] 1. A space is defined by assembling an inner formwork in a tail plate of a shield machine in opposition to an inner peripheral surface of the tail plate, and concrete is poured into the defined space and then pressurized. In a shield excavator that constructs a tunnel body and moves forward to the face side by obtaining a reaction force from the inner formwork, a reinforcing ring is arranged between the tail plate and the inner formwork, and the reinforcing ring slides mutually. The outer ring is formed of a double cylinder having an outer ring and a scalable inner ring formed by fitting both ends of a plurality of arc panels into a cylindrical shape. The opposing surfaces of both ends of the arc panel extend along the tunnel axis direction. An opening is provided, a guide is provided on the outer ring to engage with the opening of the arc panel, and the inner ring or the outer ring is slid relative to at least one of the inner ring and the outer ring in the tunnel axial direction. A step is provided, and an inclined surface is formed on a surface of the outer ring guide and the inner ring opening facing each other so as to reduce and increase the inner diameter of the inner ring by a relative sliding movement of the two rings. Excavator. 2. A space is defined by assembling an inner formwork in the tail plate of the shield machine in opposition to the inner peripheral surface of the tail plate, and concrete is poured into the defined space and then pressurized. In the shield excavator, which constructs a tunnel body and moves forward to the face side by receiving a reaction force from the inner formwork, a waterproof sheet for covering the outer periphery of the tunnel body is continuously connected between the tail plate and the tunnel body outside the machine. A reinforcing ring is arranged between the tail plate and the water-stop sheet, and the reinforcing ring is formed by fitting both ends of a cylindrical outer ring and a plurality of arc panels to each other. constitute a double tube with a collapsible inner ring to Jo, provided with an opening along the tunnel axis to the opposed surfaces of both ends of the circular arc panels, the outer ring, gas to be engaged with the opening of the arcuate panel At least one of the inner ring and the outer ring is provided with sliding means for relatively sliding the inner ring and the outer ring in the tunnel axis direction. A shield excavator, characterized by forming an inclined surface for reducing and expanding the inner diameter of the inner ring by sliding motion.