JP2001115785A - Flexible segment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an annular flexible segment which can be further strongly installed on an annular frame body on both sides of a primary cut-off member even under the load of earth water pressure. SOLUTION: There is provided an annular flexible segment which is comprised of a pair of annular frame bodies which are opposed to each other with a predetermined interval therebetween, and an annular primary cut-off member which is interposed between the frame bodies and retractable in the axial direction. In this segment, a cross sectional width W1 of the primary cut-off member arranged on a radially outward location is larger than a cross sectional width W2 of the primary cut-off member arranged on a radially inward location.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to
Shielding method for tunnels, agricultural water supply, industrial water supply, etc.
The present invention relates to an annular flexible segment used for a propulsion method or the like.

[0002]

2. Description of the Related Art Conventionally, in a shield construction method for excavating a pipeline such as a tunnel by using a shield machine, a tubular steel plate cell adapted to a cross-sectional shape of a tunnel or the like is used to prevent collapse of soil. At the same time as excavating the inside of the cell, the cell is pushed forward by a hydraulic jack or the like so that the excavator moves forward. Immediately after the excavation, the lining is temporarily covered with the annular segment. Then, a flexible segment is arranged at a predetermined position of the annular segment in order to absorb the displacement caused by expansion and contraction between the pipelines and uneven settlement of the ground to prevent the pipeline from being damaged. The flexible segment A is assembled in an annular shape by connecting ends of a plurality of divided pieces A ₁ , A ₂ , A ₃ ... Divided in the circumferential direction by bolts as shown in FIG. Each of the divided pieces of the flexible segment A has a pair of frames B ₁ , B ₂ , B ₃ on both sides in the axial direction, and primary water-stopping materials C ₁ , C ₂ , C ₃ disposed therebetween.

Further, as shown in FIG. 5, the annular flexible segment A receives a reaction force in the direction of excavation during excavation, so that a thrust receiving material 12 for supporting the same is fitted. As shown in the figure, the thrust receiving member 12 is removed, and a two-stage construction for attaching a flexible rubber joint 13 is generally performed.

[0004] Since the load is applied to the flexible segment by earth pressure even during excavation work, it is necessary to provide the flexible segment 13 with a water stopping function for a period of several months to one year, for example.

Conventionally, as shown in FIG. 5, a rubber material such as urethane is disposed as an annular structure 14 on the outer peripheral side of the flexible segment and between the frame members B so as to have a water stopping function. . This annular structure 14 is referred to as a primary water stopping material. After excavation of a tunnel or the like, the thrust receiving member 12 is removed from the flexible segment, and a flexible rubber joint 13 is attached as shown in FIG. Called.

[0006]

Since the prior art does not have a structure for suppressing the movement of the primary water-stopping material, when a load is applied to the primary water-stopping material by earth pressure, the annular segments on both sides and the primary water-stopping material come into contact with each other. The load could not be supported only by the adhesive strength, and there was a possibility that the primary water-stopping material might come off the annular segment depending on the filling work accuracy of the primary water-stopping material. An object of the present invention is to solve such a problem, and an object of the present invention is to provide an annular flexible segment which has a stronger adhesion to the annular segments on both sides of the primary waterproofing material even under the load of earth water pressure.

[0007]

SUMMARY OF THE INVENTION The present invention relates to an annular flexible segment in which an annular primary water-stop material is installed between a pair of annular frames opposed to each other at a fixed interval. Sectional width W _{1 of the} primary waterproof material located radially outward
Is the annular flexible segments being greater than the cross-sectional width W ₂ of the primary water stopping material positioned radially inward.

The primary water-stopping material is preferably made of a rubber elastic material such as polyurethane, and a pair of circumferential stiffening ribs extending in the circumferential direction are arranged on both sides of the primary water-stopping material.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing a flexible segment during excavation according to the present invention. In the flexible segment of the present invention, an annular primary waterproofing material 4 is mounted between a pair of annular frames 2 and 3, and a thrust receiving member 6 is attached along the inside of the primary waterproofing material 4. . The flexible segment is assembled in an annular shape by connecting the ends of divided pieces divided into a plurality in the circumferential direction to each other with bolts, similarly to the conventional structure. The annular frames 2 and 3 include inner plates 2a and 3a and outer plates 2b and 3b facing each other at a predetermined interval, and the outer surfaces of these inner and outer plates are both cylindrical outer plates 2c and 3c.
Welding. The inner plates are welded or the like at axially inner positions of the outer peripheral plates 2c and 3c, while the outer plates 2b and 3b are welded at axially outer end positions of the outer peripheral plates. Spacers (not shown) are interposed at regular intervals in the circumferential direction between the inner plates 2a, 3a and the outer plates 2b, 3b in order to maintain a constant interval on both sides.

Next, cylindrical inner peripheral plates 2d, 3d are arranged radially inside the outer peripheral plates 2c, 3c in parallel with the outer peripheral plates 2c, 3c.
Are provided, and one ends of the inner peripheral plates 2d, 3d are welded and fixed to the inner plates 2b, 3b. The inner peripheral plate 2 is inserted into an annular space formed by the annular frames 2 and 3.
An annular primary water blocking material 4 is sealed adjacent to the inner ends of d and 3d.

The inner plates 2a, 3a and the inner peripheral plate 2
Thrust receiving members 6 are attached in contact with c and 3c. The thrust receiving member 6 is a pair of guide frames 6 attached to the inner plates 2a, 3a and the outer peripheral plates 2c, 3c with bolts and nuts 9, respectively.
a, 6b and a wedge member 6c located in a wedge-shaped space formed by the pair of guide frames 6a, 6b. Then, bolts 10a and 10 penetrating through the wedge member 6c and the guide frame, respectively.
Both are fixed integrally by b. A plurality of thrust receiving members 6 are attached at predetermined intervals in the circumferential direction of the inner plates 2a, 3a or the inner peripheral plates 2d, 3d. When the excavation is completed, the thrust receiving member 6 is removed in an order reverse to the above-described mounting order.

The annular space in the portion from which the thrust receiving member 6 is removed is sealed by the secondary waterproof rubber 5 to cope with a case where the ground leaks from the primary waterproof material when the ground unequally subsides. The secondary waterproof rubber 5 has a corrugated cross section,
For example, it has a U-shaped cross section as shown in FIG. Both ends are attached to the inner peripheral plates 2d, 3d of the annular frames 2, 3 with bolts and nuts 9.

The primary water-stopping material 4 is made of a plurality of flexible segments and is elastically stretchable in the longitudinal direction of a tubular body, for example, a rubber-like elastic material made of polyurethane, silicone rubber, diene rubber, or other rubber components. It is preferably a body, a resin or a foam material, but urethane rubber is particularly preferred because of its excellent elasticity, durability and strength characteristics.

In the cross-sectional shape of the primary water-stopping material 4, the cross-sectional width W ₁ of the annular body in the radially outward direction is larger than the cross-sectional width W ₂ located inside the annular body, and is formed in a so-called wedge shape. That is, in FIG.
Is formed at an angle (θ) of 5 to 60 °, preferably 5 to 30 °, particularly 5 to 15 ° with respect to a center line CL connecting the outer periphery of the annular body and the center point. By adopting a wedge-shaped cross section, it is possible to restrict the movement of the primary water-stopping material outward in the radial direction at the time of soil water pressure load. The larger the angle, the higher the restraining effect, but there is a surface on which the welding work of the stiffening rib is difficult.

The side wall 4a of the primary water-stopping material 4 is formed at the same angle (θ) as shown in FIG. 3 and only a part of the side wall is formed at a different angle as shown in FIGS. Can also.

In order to fill the primary water blocking material into the divided pieces of the annular body, stiffening ribs 1 are provided on the upper surface ends of the inner peripheral plates 2d and 3d.
1a and 11b are arranged, and a rubber material as a primary water stopping material is poured from the inside of the annular body. In this case, the divided pieces are arranged upside down in FIG. In other words, the outer peripheral plates 2c, 3c are arranged on the lower side, and the insulating material 8 such as paper, household wrap material, vinyl, or the like is arranged at the bottom of the injection groove so that the rubber material does not flow out.

A rubber material molded and vulcanized into a predetermined shape with natural rubber, synthetic rubber, or the like can be inserted between the annular bodies 2 and 3. Note that a sealing material such as a sealing material, a caulking material, or a water-swelling rubber is adhered to the cross-section seam of the water-stopping material so that no gap is formed at the circumferential seam of the primary water-stopping material.

In the present invention, a cover plate 7 made of an annular thin metal plate is preferably disposed outside the outer peripheral plates 2c, 3c to protect the primary water-stopping material. It is formed of a spot-welded thin iron plate so that the flexible segment can be easily dislodged depending on the displacement at that time.

The embodiments disclosed this time are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

[0021]

According to the present invention, the primary water-stopping material is made of an elastic material and has a substantially wedge-shaped cross-section, so that it can maintain sufficient durability even when soil water pressure is applied, and can be stopped for a long time without fear of coming off the annular body. Has water action.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a state where a thrust receiving member is arranged in a flexible segment according to the present invention.

FIG. 2 is a cross-sectional view showing a state in which a secondary water blocking material is arranged in the flexible segment of the present invention.

FIG. 3 shows a cross-sectional view of a primary water blocking material.

FIG. 4 shows a schematic perspective view of a flexible segment.

FIG. 5 is a cross-sectional view showing a state in which a thrust receiving member is arranged by a conventional flexible segment.

FIG. 6 is a cross-sectional view showing a state in which a secondary waterproof material is disposed by a conventional flexible segment.

[Explanation of symbols]

2, 3 annular frame, 2a, 3a inner plate, 2b, 3b
Outer plate, 2c, 3c outer peripheral plate, 4 primary waterproof material, 5 secondary waterproof material, 6 thrust receiving material, 7 cover plate, 11 stiffening rib.

Claims (4)

[Claims] 1. An annular flexible segment in which an annular primary water-stopping material that is axially expandable and contractable is mounted between a pair of annular frames opposed to each other at a predetermined interval, and is located radially outward. primary water stopping material section width W ₁ of the annular flexible segments being greater than the radially inward section width of the primary water stopping material located W ₂ to. 2. The primary water-stopping material is a rubber elastic body.
An annular flexible segment as described. 3. The annular flexible segment according to claim 1, wherein a pair of annular stiffening ribs extending in the circumferential direction are arranged on both sides of the cross section of the primary water blocking material. 4. The annular flexible segment according to claim 1, wherein the angle between the side wall of the primary waterproof rubber and the center line of the annular flexible segment is 5 to 60 °.