CN110284909A - A kind of the section of jurisdiction waterproof sealing gasket and shield duct piece waterproof construction of antifriction - Google Patents

Abstract

The invention belongs to the technical field of civil engineering, and specifically relates to a segmental waterproof gasket for reducing friction. The gasket body has a mounting end and an extruding end, and the end surface of the extrusion end of the gasket body is provided with a friction-reducing material layer. The present invention also provides a shield segment waterproof structure. Sealing gaskets are installed in both waterproof grooves, and at least one of the sealing gaskets is the above-mentioned friction-reducing segment waterproof gasket; the friction-reducing segment waterproof The anti-friction material layer on the shield segment of the sealing pad and the extrusion end of the sealing pad on the other shield segment are extruded and sealed with each other. The present invention effectively reduces the coefficient of friction between the contact surfaces of the segment waterproof gasket by setting a friction-reducing material layer on the side of the existing segment waterproof gasket that deviates from the surface of the bottom of the waterproof groove, thereby effectively alleviating the phenomenon of staggering. Significantly improve the waterproof ability of the formed shield tunnel; and the segment waterproof sealing gasket adopted by the invention can be used in conjunction with ordinary sealing gaskets or anti-friction sealing gaskets.

Description

A friction-reducing segment waterproof gasket and a shield segment waterproof structure

technical field

The invention belongs to the technical field of civil engineering, and in particular relates to a friction-reducing segment waterproof sealing gasket and a shield segment waterproof structure.

Background technique

At present, EPDM rubber or neoprene rubber is generally used for elastic gaskets used for waterproofing of shield segment structures. During the segment assembly process, under the action of the rotating torque of the segment assembly machine, the gasket of the longitudinal seam of the segment is compacted, and the segment structure slides in place longitudinally under the thrust of the jack, and then is locked by the connecting bolt to complete the segment assembled. During the above assembly process, there is a large friction force between the contact surfaces of the densely packed longitudinal seam gaskets. The gaskets assembled first will be displaced in the opposite direction to the direction of shield tunneling under the action of friction, and the pipes will be assembled later. Under the action of friction, the gasket of the segment will have a displacement consistent with the tunneling direction of the shield, so that the longitudinal seam gasket at the corner of the segment will generally appear wrong during the assembly process. Even if the drag reducer is applied, The above phenomenon cannot be completely eliminated, which weakens the waterproof ability of the segment structure, and even causes water leakage at the corners, which affects the durability and normal service performance of the shield tunnel.

Contents of the invention

In order to overcome the deficiencies in the above-mentioned prior art, the object of the present invention is to provide a friction-reducing segment waterproof gasket and a shield segment waterproof structure, which can reduce the contact surface friction of the segment waterproof gasket, thereby effectively Alleviate the phenomenon of staggering, and significantly improve the waterproof ability of the formed shield tunnel.

In order to achieve the above object, the technical solution of the present invention is a kind of anti-friction segment waterproof gasket, including the gasket body, the gasket body has a mounting end that can extend into the waterproof groove of the shield segment and can The extruding end is matched with the sealing pad of another shield segment, and the end surface of the extruding end of the sealing pad body is provided with a friction-reducing material layer.

Further, the thickness of the anti-friction material layer is 0.1-1 mm.

Further, the anti-friction material layer is a thin sheet made of polytetrafluoroethylene or a material with a small friction coefficient similar to polytetrafluoroethylene.

Furthermore, the anti-friction material layer is vulcanized synchronously with the gasket body and molded at one time, or the friction-reduction material layer is pasted on the surface of the gasket body.

Further, the installation end of the gasket body is provided with a groove with an opening facing away from the extruding end.

Furthermore, the gasket body is provided with a plurality of through holes, the through holes are arranged along the length direction of the gasket body, and the through holes are located between the anti-friction material layer and the groove between.

Furthermore, the through holes include several first holes and several second holes, and a second hole is provided above two adjacent first holes.

Furthermore, a third hole is provided above and outside the first holes on both sides.

The present invention also provides a shield segment waterproof structure, comprising two shield segment segments, and the waterproof grooves of the two shield segment segments are arranged oppositely; each of the waterproof grooves is equipped with a gasket, and at least One gasket is the above-mentioned anti-friction segment waterproof gasket; the anti-friction material layer of the gasket body on the shield segment of the anti-friction segment waterproof gasket is installed and the seal on the other shield segment The extruded ends of the pads extrude against each other to seal.

Compared with prior art, the beneficial effect of the present invention:

(1) In the present invention, an anti-friction material layer is provided on the end face of the extruding end of the existing gasket body for extrusion with the gasket of another shield segment, effectively reducing the gap between the contact surfaces of the waterproof gasket of the segment. friction coefficient, thereby effectively alleviating the phenomenon of staggering, and significantly improving the waterproof ability of the formed shield tunnel;

(2) In the present invention, by pasting or synchronously vulcanizing polytetrafluoroethylene or a material with a small friction coefficient similar to polytetrafluoroethylene on the existing segment waterproof gasket to reduce the misalignment of the gasket during the assembly process;

(3) The segment waterproof gasket provided by the present invention can be used in conjunction with ordinary gaskets or friction-reducing gaskets.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Figure 1 is a cross-sectional view of a common waterproof gasket;

Fig. 2 is the cross-sectional view of the anti-friction segment waterproof gasket provided by the embodiment of the present invention;

Fig. 3 is a cross-sectional view of the anti-friction segment waterproof gasket used in conjunction with the embodiment of the present invention;

In the figure: 1. Gasket body, 2. Friction-reducing material layer, 3. Groove, 4. First hole, 5. Second hole, 6. Third hole.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In describing the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", The orientations or positional relationships indicated by "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying References to devices or elements must have a particular orientation, be constructed, and operate in a particular orientation and therefore should not be construed as limiting the invention.

The terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of these features; in the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

As shown in Figure 2, an embodiment of the present invention provides a friction-reducing segment waterproof gasket, which includes a gasket body 1, and the gasket body 1 has an installation end that can extend into the waterproof groove of the shield segment And the extruding end that can be co-extruded with the sealing gasket of another shield segment, the end surface of the extruding end of the sealing gasket body 1 is provided with a friction-reducing material layer 2 . In the present invention, an anti-friction material layer 2 is provided on the extruded end face of the extruding end of the existing gasket body 1 for co-extruding with the gasket of another shield segment, thereby effectively reducing the distance between the contact surfaces of the waterproof gasket of the segment. The coefficient of friction between them can effectively alleviate the phenomenon of staggering and significantly improve the waterproof ability of the formed shield tunnel.

Further, the thickness of the anti-friction material layer 2 is 0.1-1mm. The present invention ensures other performances of the gasket body 1 while reducing the coefficient of friction through proper thickness of the friction-reducing material layer 2 . Further, the anti-friction material layer 2 of this embodiment may be a thin sheet made of polytetrafluoroethylene, or a thin sheet made of a polymer material having the same or similar friction coefficient as the polytetrafluoroethylene thin sheet. In this embodiment, the anti-friction material layer 2 can be fixed on the extruded end face of the extruded end of the gasket body 1 for cooperating with the extruded gasket of another shield segment in various ways. Preferably, the The anti-friction material layer 2 is vulcanized synchronously with the gasket body 1 and molded at one time, or the anti-friction material layer 2 is pasted on the surface of the gasket body 1 to reduce the friction between the segment waterproof gasket and the segment waterproof gasket. The frictional force of the contact facilitates the segment structure to slide in place in the longitudinal direction, and avoids misalignment of the gasket body 1 during the assembly process.

Further, the installation end of the gasket body 1 is provided with a groove 3 with an opening facing away from the extrusion end. The line connecting the midpoints of the upper and lower sides of the cross section of the gasket body 1 in this embodiment is the axis of symmetry of the gasket body 1, and a plurality of grooves 3 are symmetrically distributed on both sides of the axis of symmetry, as shown in Figure 2 The side of the gasket body 1 that is attached to the bottom of the waterproof groove is provided with four U-shaped grooves 3 with openings facing the shield segments, and two grooves 3 are provided on each side of the axis of symmetry.

Further, the gasket body 1 is provided with a plurality of through holes, the through holes are arranged at intervals along the length direction of the gasket body 1, and the through holes are located between the friction-reducing material layer 2 and the Between the grooves 3; the plurality of through holes in this embodiment are symmetrical with respect to the axis of symmetry. Furthermore, the through holes include several first holes 4 and several second holes 5, and the upper part between two adjacent first holes 4 is provided with second holes 5; A third hole 6 is provided on the top of the outer side. As shown in Figure 2, the gasket body 1 of this embodiment is provided with three first holes 4, two second holes 5 and two third holes 6, and the two second holes 5 are respectively located in the first hole in the middle 4 and above the first holes 4 on both sides, the first hole 4 in the middle is symmetrical about the axis of symmetry, and the third hole 6 is located outside the first holes 4 on both sides.

Furthermore, the cross-section of the first hole 4 is triangular, and the cross-section of the second hole 5 is an inverted triangle. As shown in Figure 2, the size of the first hole 4 and the second hole 5 are the same, the second hole 5 is located directly above between two adjacent first holes 4, and the bottom of the second hole 5 Inserted between the two first holes 4 . The cross section of the third hole 6 in this embodiment is an irregular ellipse, and the size of the third hole 6 is smaller than that of the first hole 4 and the second hole 5 , as shown in FIG. 2 .

In the gasket body 1 of the segment waterproof gasket of this embodiment, reinforcement materials can also be added to improve the ability of the gasket to resist deformation under the action of friction, and effectively reduce the deformation of the gasket under the action of friction of the contact surface. , to further alleviate the phenomenon of staggering, thereby more significantly improving the waterproof ability of the formed shield tunnel. The reinforced material is a material with a high modulus of elasticity; the reinforced material in this embodiment may use steel bars, nylon ropes or other materials with a high modulus of elasticity. Preferably, the reinforcing material is arranged inside the extruded end of the gasket body 1 of the reinforcing material, so as to reduce the deformation of the gasket body when the segment structure slips. The reinforcement material includes a plurality of longitudinal ribs arranged along the length direction of the gasket body 1 of the reinforcement material, and the plurality of longitudinal ribs are arranged at intervals, and the specific number of longitudinal ribs is set according to actual needs. In the gasket body of this embodiment, the longitudinal ribs arranged along the length direction of the gasket body are consistent with the sliding direction of the segment structure, and the deformation of the gasket body can be reduced. 1. A plurality of transverse ribs arranged at intervals in the length direction, and a plurality of transverse ribs are connected with a plurality of longitudinal ribs to form a network structure, which improves the overall deformation resistance.

The present invention also provides a shield segment waterproof structure, comprising two shield segment segments, and the waterproof grooves of the two shield segment segments are arranged oppositely; each of the waterproof grooves is equipped with a gasket, and at least One gasket is the above-mentioned anti-friction segment waterproof gasket; the anti-friction material layer 2 of the gasket body 1 on the shield segment of the anti-friction segment waterproof gasket is installed on the other shield segment The extruded ends of the gaskets extrude each other for sealing. As shown in Figure 3, this embodiment effectively reduces the friction between the contact surfaces of the gaskets by pasting or synchronously vulcanizing polytetrafluoroethylene (or other materials that can effectively reduce the friction coefficient between rubbers) sheets on the existing gaskets. Friction coefficient, the segment waterproof gasket of this embodiment can be used in conjunction with ordinary gaskets or the anti-friction segment waterproof gasket provided by this embodiment, thereby effectively alleviating the phenomenon of staggering and significantly improving the waterproofing of the formed shield tunnel ability.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (10)

1. A friction-reducing segment waterproof gasket, comprising a gasket body, the gasket body has an installation end that can extend into the waterproof groove of a shield segment and can be sealed with another shield segment The extrusion end of the gasket fits the extrusion, and it is characterized in that: the end surface of the extrusion end of the sealing gasket body is provided with a friction-reducing material layer. 2. The anti-friction segment waterproof gasket according to claim 1, characterized in that: the thickness of the anti-friction material layer is 0.1-1 mm. 3. A kind of antifriction segmental waterproof gasket as claimed in claim 1, characterized in that: said antifriction material layer is made of polytetrafluoroethylene or has a similar small friction coefficient as polytetrafluoroethylene sheets made of materials. 4. A anti-friction segmental waterproof gasket as claimed in claim 3, characterized in that: the anti-friction material layer is vulcanized synchronously with the gasket body and molded at one time, or the anti-friction material layer is pasted on the surface of the gasket body. 5 . The anti-friction segment waterproof gasket according to claim 1 , wherein the installation end of the gasket body is provided with a groove with an opening facing away from the extrusion end. 5 . 6. A anti-friction segmental waterproof gasket as claimed in claim 5, characterized in that: the gasket body is provided with a plurality of through holes, and the through holes are along the length direction of the gasket body arranged, and the through hole is located between the anti-friction material layer and the groove. 7. A kind of anti-friction segmental waterproof gasket as claimed in claim 6, characterized in that: said through holes include several first holes and several second holes, and the upper part between two adjacent first holes A second hole is provided. 8 . The anti-friction segmental waterproof sealing gasket according to claim 7 , wherein a third hole is provided above and above the outer sides of the first holes on both sides. 9 . The anti-friction segmental waterproof sealing gasket according to claim 7 , wherein the first hole is triangular, and the second hole is inverted triangular. 10 . 10. A shield segment waterproof structure, characterized in that: two shield segments are included, and the waterproof grooves of the two shield segments are relatively arranged; sealing gaskets are installed in each of the waterproof grooves, and At least one gasket is the antifriction segment waterproof gasket according to any one of claims 1-9; The extrusion end of the friction material layer and the gasket on the other shield segment is extruded and sealed with each other.