JPS58189499A - Flexible segment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] Although this invention relates to flexible segments, the purpose of the primary lining in the shield construction method is to prevent the collapse of the ground and form the most important part of the shield construction method in which tunnels are constructed in the ground. All of the tunnel's tonosho is supported by the primary lining. This primary lining is assembled within the shield using segments divided into a plurality of segments to facilitate assembly into the tunnel lining.

However, in Japan, where the ground is soft and there are many earthquakes, shielded pipelines made of segments are susceptible to uneven settlement and external forces such as bending, shearing, expansion/contraction, and torsion caused by earthquakes, which can easily lead to damage accidents. There was a serious problem. Therefore, in recent years, flexible segments have been used that can absorb the stresses and displacements such as bending, shearing, stretching, and torsion caused by uneven settlement of the shielded pipeline and earthquakes. Interventions are now installed. As a conventionally known general flexible segment, there is a structure in which a plurality of water stop rubber bands, anti-covers, etc. are interposed in the telescoping part between the segment parts on both sides. These conventional flexible segments are
It has a cumbersome structure with many bolts used to attach each part, and these bolts tend to loosen due to complex vibrations and shock loads applied to each part, resulting in breakdowns and instability problems. In addition, conventional methods in particular have difficulty adapting to complex ground movements, causing damage to water-stopping rubber bands and the like due to sudden ground movements, and have problems with durability, strength, and water-stopping properties. Ta.

In view of the above, the present invention provides a flexible segment as described below to eliminate the various drawbacks and problems of the prior art.

The flexible segment (flexible segment) Th drawing example of this invention will be explained in detail.

The drawing shows a segment divided into a plurality of parts, and on both sides in the width direction there are segment parts +,
ll are arranged respectively. The expansion/contraction interval S and the narrowed segment portions on both sides.

A skin plate/ which can be formed on the flexible bellows part 2 at the expansion/contraction interval S is attached to the outer surface of t. As shown in the figure, the flexible bellows part 2 has a molded structure in which the flat parts on both sides of the skin brake (skin brake)/ are fully housed, and are formed in a wave-like meandering shape inwardly without protruding outwardly. This is done so that it does not become a hindrance when doing so. Further, both ends of the skin plate / are respectively bent inward to form side 7 langes /a, /a attached to the end faces of both side segment parts +, +'.

Further, numerals 3 and 3 are inner frame segments that are respectively melted onto the skin plates, and the length between the inner frame segments 3 and 3 constitutes the entire expansion/contraction interval S. Note that corresponding through holes 3', 3' are bored in the inner frame segments 3, 3 on both sides, respectively. And sheath pipes S are attached with their open ends communicating with the through holes 3.3.

5 are embedded in both side segments) # and lI, respectively. Note that B is the anchor reinforcing bar. /2 is an elastic body such as urethane foam inserted in the expansion/contraction interval S between the inner frame segments 3, 3 on both sides. The elastic body /2 of the lever can be inserted and installed over the entire circumferential direction of the expansion/contraction interval S as in the case of the example shown in the drawing, or it can be mounted, for example, by a universal joint described later//
It is also possible to perform partial (sexual) intervention in which only the intervention part is not intervened. In addition, in the case of whole-area intervention with the above expansion/contraction interval S,
Naturally, the universal joint // is embedded within the elastic body /2. 7 connects the shaft part to the sheath tube S on both sides.

Two spherical sockets on both the left and right sides are inserted into the socket 7.j so as to be slidable in the width direction with all the springs intervening, and the balls 10 at both ends are rotatably engaged with the left and right spherical sockets 7.7. The joint parts are connected with the fitting surfaces in contact to form a universal joint 11. i.e. bilateral segments)! , II constitutes a spherical pair (ball joint) universal joint // that variably connects.

As shown in FIG.
It is installed by intervention in each location. In the case of the embodiment shown in the drawings, each of the above-mentioned adjustable joints/l is embedded in the elastic body 12 which is interposed over the entire area of the extension distance S, and in this case, the spring springs in the sheath pipes S on both sides are embedded. can be omitted. That is, in the case of partial intervention in which the elastic body 12 is not intervened in each universal joint 1/intervening part, each spring latch is connected to each universal joint//
This serves to position and hold it at the center of the full expansion/contraction interval S.

In addition, in the drawing example, the SC segment (reinforced concrete general segment) is shown as having a top peeling, and both side segment portions t, t are constructed with appropriate reinforcement and primary concrete rolls. In the case of the flexible segment of the present invention, secondary rolling concrete is not required.

As described above, the flexible segment of the present invention is assembled into a ring body and is inserted and installed as needed in the required portion of the shielded conduit by the general segment. This flexible segment can be changed from the normal installation state shown in Figure (A) to
When subjected to external forces such as compression (shrinkage), tension (elongation), shearing, bending and torsion in the axial direction, the flexible bellows part 2 of the skin plate/, the universal joint// and the elastic body 12 deform, respectively.
Figure (b) shrinks the drawing number that is displaced and absorbs the respective stress;
The same (c) elongation, the same) shearing, the same (e) bending and the same (f)
This results in a twisted state.

In addition, in the flexible segment of this invention, appropriate temporary thrust receiving materials are removably attached so that when the shield is propelled, the segment parts on both sides <Z, Il are connected by the temporary thrust receiving materials and fully function as a segment. It is something that can be done.

As described above, the flexible segment of the present invention has a skin in which elastic bellows portions 2 are formed at the elastic interval S in the center and on the outer surfaces of the segment parts on both sides. Plate/all installation, the expansion/contraction interval ms, body material such as urethane foam 7.2 and both side segment)! , I
This is a flexible joint that variably connects I and is attached to each joint.Unlike conventional ones, it has a simple structure that does not require any bolt attachment, and has stable durability that does not cause any breakdown or trouble over a long period of time. It has excellent effects such as being able to maintain and provide it at low cost. In particular, in the flexible segment of the present invention, the three members, the AF flexible bellows part of the skin plate, the elastic body such as urethane foam, and the flexible joint jointly perform bending, shearing, and expansion/contraction.

It can absorb stress and displacement such as torsion in a complex and effective manner,
It has the tremendous effect of contributing to maintaining the safety of pipelines by completely preventing various types of damage to shielded pipelines caused by uneven subsidence of soft ground or ground fluctuations caused by earthquakes.

Furthermore, since a pair of spherical universal joints /l which variably connect the segments p and ll on both sides are inserted and installed in the expansion/contraction interval S, the elements on both sides can mutually perform spherical motion by the universal joints //. It is capable of responding to complex and diverse external forces in any direction, can appropriately adapt to complex and rapid ground movements, and the elastic body /2 inserted at the expansion/contraction interval S provides a stable shield. It functions as a water seal,
It has the effect of significantly improving durability strength and water resistance.

[Brief explanation of drawings]

The drawings show an embodiment of the flexible segment of the invention.
FIG. 1 is a front view, FIG. 2 is a bottom view, and FIG. 3 is an enlarged sectional view taken along the line A-A in FIG. 1 with some parts omitted. Figure 5 (A) is a partial vertical cross-sectional view of the flexible segment in its normally installed state, and Figures (B) to (F) are partial vertical cross-sectional views of each state in which it is deformed and displaced under the influence of external forces. . /,・Skin plate /,a,,Side flange. 20. Flexible bellows part, 3., Inner frame segment, 3', Through hole, Ilo, Segment part, S, Sheath pipe, 6°, Anchor reinforcing bar, 760 spherical tongue, 7'+ + shaft part,
and・spring, ql, joint eave, 10.・Ball, //1. Universal joint, /, 2. , elastic body, So, expansion/contraction interval.

Claims (1)

[Claims] The expansion/contraction interval S in the center and the segment parts on both sides that completely sandwich it +
, Attach a skin plate/on which a flexible bellows portion 2 is formed at the stretchable interval S to the outer surface of tI, and attach an elastic body 7.2 and both side segment) to the stretchable interval S! , lI, and a flexible segment formed by a pair of spherical universal joints/If, respectively, and an intervention device M for variably connecting them.