CN215672273U - A there is not waterproof sealing gasket of foot that is used for shield tunnel to seal kicking block, adjacent piece - Google Patents

Abstract

The utility model provides a there is not waterproof sealing pad of foot for shield tunnel capping piece, adjacent block, includes rectangular form rubber materials body (1), and rubber materials body (1) distributes along rectangular direction has multirow tension hole, and basal portion (2) of rubber materials body (1) are bonded in capping piece (4) or the seal groove that adjoins block (5), and head (3) of rubber materials body (1) expose the seal groove, its characterized in that: the bottom edge of the base (2) is a flush solid bottom edge, and the bottom edge (2a) of the solid bottom edge is parallel to the top edge (3a) of the head (3). The waterproof sealing gasket without the feet is used for waterproof joints between the shield tunnel top sealing block and the adjacent blocks, and has the advantages of good shearing resistance, dynamic friction resistance, good staggered platform resistance, good waterproof performance, high reliability and long service life.

Description

A there is not waterproof sealing gasket of foot that is used for shield tunnel to seal kicking block, adjacent piece

Technical Field

The utility model relates to a waterproof elastic sealing gasket for a shield tunnel segment joint.

Background

The shield tunnel has the advantages of automatic shield machine construction, prefabricated duct piece assembly, wide application range and the like, and is widely applied to tunnel traffic engineering. The lining structure of the shield tunnel is characterized in that arc-shaped duct pieces are spliced into duct piece rings in the circumferential direction through bolts, and the duct piece rings are longitudinally spliced through inter-ring bolts to form a tunnel lining;

therefore, seams exist between the segments of the shield tunnel in both circumferential direction and longitudinal direction. The shield tunnel is buried underground and surrounded by underground water, and the seams of the segment lining structure easily cause water leakage of the tunnel, so that the shield tunnel becomes a main disease influencing the safe operation of the shield tunnel.

The waterproof method of the shield tunnel joint is characterized in that a circle of sealing groove is prefabricated on the side surface of a duct piece, the base part of a strip-shaped elastic sealing gasket is stuck in the prefabricated sealing groove, and a circle of sealing gasket is formed on the side surface of the duct piece; through the extrusion force of adjacent segments in the assembling process, the tops of the elastic sealing gaskets of the adjacent segments are mutually contacted and compressed, so that the sealing and waterproof effect of the tunnel is achieved. Referring to fig. 1, the conventional elastic gasket is a "footed gasket", that is, when viewed from the end face of the elastic gasket body material 1, the top 3 is flush, the base 2 is provided with a plurality of n-shaped grooves which are uniformly distributed, and partition walls are formed among the grooves, namely, the "footers" of the elastic gasket. When the sealing gasket is installed, firstly, glue is smeared in a prefabricated sealing groove of the duct piece, and then the base part with the feet of the elastic sealing gasket is embedded into the sealing groove of the duct piece, so that the base part 2 is bonded with the sealing groove. The sealing gasket has good elasticity, small required installation and assembly extrusion force and better waterproof effect on the waterproof of seams among the standard block segments.

The applicant finds that in the assembling process of the tunnel segment ring, the segment assembled last in the segment ring, namely the capping block segment, does not have enough redundant assembling space, and can not be assembled between the segments like the segment assembled in advance (a standard block segment and an adjacent block segment) by screwing the connecting bolt after aligning, and the extrusion of the elastic sealing gasket can be realized (the elastic sealing gasket is only subjected to forward extrusion force). The capping block can only be processed into a wedge shape with a small front and a large back (the outer peripheral surface is approximately isosceles trapezoid with a small front and a large back), and the mounting mode is as follows by taking the capping block right above the tunnel as an example: firstly, the capping block 4 is placed below the gap between two adjacent blocks 5, and then the capping block 4 is pushed forward (longitudinally, i.e. in the direction of the arrow in fig. 3a) to a depth of 2/3 (see fig. 3 a); the capping block 4 is then wedged upwards again, aligning the capping block with the abutment block in the radial direction (i.e. in the direction of the arrow in fig. 3b) (see fig. 3 b); finally, the capping blocks 4 are all pushed in, so that the capping blocks 4 and the adjacent blocks 5 are aligned in the front-back (longitudinal) direction (see fig. 3c and 3d), and the assembly of the capping blocks 4 is completed. In the process, the sealing gaskets adhered to the sealing grooves of the top sealing block 4 and the adjacent block 5 are subjected to both longitudinal shear compression and dynamic friction (see fig. 3a) and radial shear compression and dynamic friction (see fig. 3b), and finally to circumferential positive pressure (see fig. 3c and 3 d). The base of the sealing gasket belt foot can well bear circumferential positive pressure, but cannot bear longitudinal and radial shearing extrusion and dynamic friction, and the foot is easy to shear, warp and deform and even break away from the sealing groove, so that the sealing gasket is damaged.

Meanwhile, because the standard block duct piece and the adjacent block duct piece have enough circumferential space when being assembled, only the bolts need to be aligned and screwed from the circumferential direction; therefore, the dimension processing errors of the pipe pieces of the standard blocks and the pipe pieces of the adjacent blocks in the upward direction can be accumulated in the reserved sector ring space of the top sealing block, so that the radian of the reserved sector ring space of the top sealing block is larger or smaller; when the radian is larger (smaller), the top sealing block deviates from the outer ring surface (inner ring surface) to form a radial inner staggered platform (outer staggered platform) with the adjacent block; the inner and outer staggered platforms can lead the sealing gasket of the sealing top block to be staggered with the sealing gasket of the adjacent sealing block, the actual contact area of the top of the adjacent sealing gasket becomes smaller, the extrusion stress is more concentrated, and the base of the sealing gasket belt foot is easy to be deformed and deformed integrally. In a word, when the existing sealing gasket is used for waterproofing the joint of the abutting block and the top sealing block, the sealing gasket has poor waterproofing performance, low reliability and short service life.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a waterproof sealing gasket without feet for a shield tunnel top sealing block and an adjacent block, which is used for preventing the seams between the shield tunnel top sealing block and the adjacent block from being waterproof, and has the advantages of good waterproof performance, high reliability and long service life.

The technical scheme adopted by the utility model for realizing the aim is that the footeless waterproof sealing gasket for the shield tunnel top sealing block and the adjacent block comprises a long strip-shaped rubber material body, wherein a plurality of rows of tension holes are distributed on the rubber material body along the long strip direction, the base part of the rubber material body is bonded in a sealing groove of the top sealing block or the adjacent block, and the head part of the rubber material body is exposed out of the sealing groove, and the footed waterproof sealing gasket is characterized in that: the bottom edge of the base is a flush solid bottom edge, and the bottom edge of the solid bottom edge is parallel to the top edge of the head.

Compared with the prior art, the utility model has the beneficial effects that:

firstly, the sealing blocks are longitudinally overlapped 2/3 in depth, then radially wedged, and finally in the assembling process of longitudinal insertion, the sealing gaskets adhered to the sealing grooves of the sealing blocks and the adjacent blocks adjacent to the sealing blocks are subjected to longitudinal shearing extrusion and dynamic friction and also subjected to radial shearing extrusion and dynamic friction; and finally, bearing the circumferential positive pressure. The non-foot sealing gasket of the utility model cancels the n-shaped groove of the existing foot sealing gasket, and a through solid bottom edge is formed at the base part, and all parts are encircled to form a closed structure; namely, the vertical one-dimensional columnar stress of the existing foot is changed into the two-dimensional integral stress which is vertically and transversely connected into a whole, so that a shear-resistant and crack-limiting system is formed, and the action of uneven extrusion and shearing is relieved; the integrity and the stability of the end face (cross section) structure of the sealing gasket are enhanced, the shearing resistance of the sealing gasket is greatly enhanced, and the shearing extrusion and the dynamic friction of the sealing top block in the assembling process can be well resisted. The phenomenon that the sealing gasket is damaged due to the fact that the contact area between the sealing gasket and the sealing groove is greatly weakened because the sealing gasket is not sheared, tilted and deformed or even separated from the sealing groove in the assembling process can be avoided; the shape of the sealing gasket is well kept, the sealing gasket is well contacted with the sealing groove, the waterproof performance is good, the reliability is high, and the service life is long.

Secondly, the size processing errors of the pipe pieces are accumulated in the reserved sector ring space of the top sealing block, so that the radian error of the reserved sector ring space of the top sealing block is large, and the top sealing block is easy to stagger with an adjacent block; meanwhile, in the tunnel operation process, due to the reasons of stratum dislocation and the like, the segment dislocation can be caused. The segment staggering makes the sealing gasket of the sealing top block and the sealing gasket of the adjacent block staggered, so that the sealing gasket generates shear stress, meanwhile, the contact area of the tops of the adjacent sealing gaskets is small, and the extrusion stress is more concentrated. The two-dimensional integral stress formed by the footless sealing gasket and connected into a whole vertically and transversely has good structural integrity and strong stability, and can well bear the staggered platform extrusion stress and the shearing stress. The integral instability and deformation of the sealing gasket caused by dislocation are avoided. And the waterproof performance is poor, the reliability is high and the service life is long.

And thirdly, the communicated bottom edge entity also increases the contact area between the sealing gasket and the sealing groove, the bonding strength of the sealing gasket and the sealing groove is high, the stress area is increased, and the waterproofness and the reliability of the sealing gasket are further improved.

Further, the rubber material body adopts ethylene propylene diene monomer.

Furthermore, the tension holes in the four rows are four rows, the middle tension hole of the fourth row close to the bottom edge of the solid body is in a door arch shape with the arch top facing the bottom edge, and the tension holes on the two sides are in a triangle shape.

The fourth row of tension holes close to the bottom edge can well increase the expansion and contraction of the sealing gasket, increase the elasticity of the sealing gasket and improve the waterproof performance of the sealing gasket; meanwhile, the arch-shaped tension holes in the middle of the bottom edge can uniformly disperse and transmit the stress of the substrate to the sealing gasket main body, and the triangular tension holes on the two sides can also well uniformly disperse and transmit the stress of the substrate and the stress of the base side to the sealing gasket main body; the overall anti-extrusion and shearing capabilities of the gasket are also increased.

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Drawings

Fig. 1 is a schematic end view of a conventional base-footed gasket.

Fig. 2 is a schematic end view of a footless waterproof gasket according to an embodiment of the present invention.

FIG. 3a is a top down close-up view of the upper capping block as it is initially assembled.

Figure 3b is a reduced front view of the upper capping block as it begins to wedge radially.

FIG. 3c is a schematic view of the top down reduced structure of the top capping block when it is assembled.

FIG. 3d is a schematic view of a reduced front view of the top capping blocks as they are assembled.

Fig. 4 is an enlarged view of the portion a in fig. 3d (a front view of the partial structure after the top block is contacted with the gasket on the adjacent block).

Fig. 5a is a schematic view showing a deformed state of a conventional gasket having a foot at a base portion when a significant dislocation occurs.

Fig. 5b is a schematic diagram showing a deformed state of the footless waterproof gasket according to the embodiment of the present invention when a significant dislocation occurs.

Detailed Description

Examples

Fig. 2 and 4 show that one embodiment of the present invention is: the utility model provides a there is not waterproof sealing pad of foot for shield tunnel capping piece, butt joint piece, includes rectangular form rubber materials body 1, and rubber materials body 1 distributes along rectangular direction has multirow tension hole, and 2 bonds in capping piece 4 or the seal groove that borders on piece 5 in the basal portion of rubber materials body 1, and 3 the seal grooves of exposing of head of rubber materials body 1, its characterized in that: the bottom edge of the base 2 is a flush solid bottom edge, and the bottom edge 2a of the solid bottom edge is parallel to the top edge 3a of the head 3.

The rubber material body 1 of the embodiment is made of ethylene propylene diene monomer.

The tension holes in the multiple rows are four rows, the middle tension hole 1a of the fourth row of tension holes close to the solid bottom edge 2a is in a door arch shape with the arch top facing the bottom edge, and the tension holes 1b on the two sides are in a triangle shape.

FIG. 5a is a schematic view showing a deformation of a conventional base-footed gasket when a significant dislocation occurs;

fig. 5b is a schematic diagram of the deformation of the footless waterproof gasket according to the embodiment of the present invention when the platform is obviously staggered.

Fig. 5a and 5b show: when the capping block 4 and the adjoining block 5 are significantly staggered radially by the same amount, the contact area between the footed gasket and the seal groove is greatly weakened, and the contact area between the footeless gasket and the seal groove is hardly changed. From the deformation form, the sealing gasket with the feet is seriously tilted and twisted in the sealing groove, the feet are unstable, the sealing gasket is poorly attached to the sealing groove, and the water resistance and the reliability are poor; the sealing gasket without the foot part has the advantages of integral deformation coordination, small deformation in the sealing groove, no serious tilting distortion, full lamination between the sealing gasket and the sealing groove, maintenance of a (central) symmetrical and uniform stress distribution state, excellent waterproof performance and strong reliability.

The waterproof sealing gasket without the feet is mainly used for waterproof of the joints of the capping block 4 and the adjacent block 5 in the shield tunnel segment, and can also be used for waterproof of the joints of standard segment segments; when the waterproof gasket is used for waterproof of the joint of the standard block, the rubber consumption of the waterproof gasket is slightly increased, and the assembly extrusion force during assembly is also slightly increased.

The radial direction in the present invention means the radial direction of the segment ring, and the forward and backward (longitudinal) directions mean the advancing and retreating directions of the segment ring (tunnel).

Claims (3)

1. The utility model provides a there is not waterproof sealing pad of foot for shield tunnel capping piece, adjacent block, includes rectangular form rubber materials body (1), and rubber materials body (1) distributes along rectangular direction has multirow tension hole, and basal portion (2) of rubber materials body (1) are bonded in capping piece (4) or the seal groove that adjoins block (5), and head (3) of rubber materials body (1) expose the seal groove, its characterized in that: the bottom edge of the base (2) is a flush solid bottom edge, and the bottom edge (2a) of the solid bottom edge is parallel to the top edge (3a) of the head (3).

2. The footless waterproof gasket for the shield tunnel capping block and the abutting block as claimed in claim 1, wherein: the rubber material body (1) is made of ethylene propylene diene monomer.

3. The footless waterproof gasket for the shield tunnel capping block and the abutting block as claimed in claim 1, wherein: the tension holes in the multiple rows are four rows, the middle tension hole (1a) of the tension hole in the fourth row close to the bottom edge (2a) of the solid body is in a door arch shape with the arch top facing the bottom edge, and the tension holes (1b) on the two sides are in a triangle shape.

Images