CN106593492A - Waterproof elastic sealing gasket for deep water draining shield tunnel segment seam - Google Patents

Abstract

The invention relates to a waterproof elastic gasket for the joints of deep drainage shield tunnel segments, which is used for sealing the joints of two adjacent tunnel segments. The upper end surface of the elastic gasket is parallel to the lower end surface and the upper end surfaces are mutually Compression seal, the lower end surface is set in the installation groove of the tunnel segment, the elastic gasket is symmetrical about the line connecting the midpoint of the upper and lower end surfaces, including an integrally formed gasket body, two ends arranged on the left and right sides and A plurality of supporting feet, the first row of through holes and the second row of through holes are arranged side by side on the gasket body, and grooves are provided between the end and the supporting feet and between adjacent supporting feet , the end portion and the bottom surface of the supporting foot together form the lower end surface. Compared with the prior art, the invention has the advantages of optimized sealing performance, reduced assembly force, simple structure, convenient installation and the like.

Description

A waterproof elastic sealing gasket for segment joints of deep drainage shield tunneling

technical field

The invention relates to the field of deep drainage, river crossing, sea crossing and other shield tunnel engineering fields, in particular to a waterproof elastic gasket for segment joints of deep drainage shield tunnels.

Background technique

Shield tunnels such as deep drainage, crossing rivers, and crossing seas have high requirements for preventing water leakage in shield tunnels, among which the waterproofing of segment joints is the key part. At present, non-expandable synthetic rubber is usually used in actual engineering, mainly to use the joint material to achieve the purpose of waterproofing. Generally, the EPDM material is molded into a certain shape to make an elastic gasket, as the main waterproof material. In the project, the EPDM rubber elastic gasket is pasted in the prefabricated groove of the segments, and the waterproof function is obtained by squeezing the elastic gaskets respectively attached to the two segments when the segments are assembled. However, shield tunnels such as deep drainage, river crossing, and sea crossing have higher requirements on the waterproof ability of elastic gaskets. In order to achieve a certain waterproof ability, the EPDM elastic gasket will be thicker and larger. If the assembly force of the extrusion gasket is too large, the end of the segment joint (referring to the concrete outside the gasket groove) will be damaged. Therefore, the cross-sectional form of the gasket can be improved, and holes can be reasonably opened in the gasket to control the assembly force and ensure the water-stop effect. This cross-sectional form also makes the elastic gasket have greater compressibility and higher elasticity. Even if the segment seams have a certain amount of opening, it can still be in a certain compressed state, which can effectively prevent water leakage. Therefore, it is necessary to provide a new type of elastic gasket cross-section, so that it can meet the waterproof requirements of shield tunnel segment joints under high water pressure, and at the same time ensure that the assembly force can meet the construction and design requirements. Under the circumstances, it still retains a high waterproof ability.

Contents of the invention

The object of the present invention is to provide a deep drainage shield tunnel segment seam waterproof elastic gasket with optimized sealing performance, reduced assembly force, simple structure and convenient installation in order to overcome the above-mentioned defects in the prior art.

The purpose of the present invention can be achieved through the following technical solutions:

A deep drainage shield tunnel segment seam waterproof elastic gasket, used for sealing the joints of two adjacent tunnel segments, the upper end surface of the elastic gasket is parallel to the lower end surface, and the upper end surfaces are pressed against each other for sealing , the lower end surface is set in the installation groove of the tunnel segment, and the elastic gasket is symmetrical to the left and right of the line connecting the midpoint of the upper and lower end surfaces, including an integrally formed gasket body, two ends arranged on the left and right sides, and multiple supports The first row of through holes and the second row of through holes are arranged side by side on the gasket body, grooves are provided between the end and the supporting feet and between adjacent supporting feet, and the The end and the bottom surface of the supporting foot together form the lower end surface.

The first row of through-holes includes first-type through-holes and second-type through-holes arranged side by side, and the first-type through-holes and second-type through-holes are arranged in sequence from the inside to the outside centering on the line connecting the midpoints , the second row of through-holes includes third-type through-holes and fourth-type through-holes arranged side by side, and the third-type through-holes and fourth-type through-holes are centered on the midpoint line from inside to outside in sequence set up.

The first type of through-hole is an arch-shaped cross section formed by a semi-circular arc, two side lines tangent to the semi-circular arc, and a base connecting the two side lines and parallel to the diameter of the semi-circular arc. Through holes, the cross-section of the second type of through holes is a right-angled trapezoid, the shape of the third type of through holes is the same as that of the first type of through holes, and is inverted with the first type of through holes. The cross-section of the four-type through hole is a right triangle.

The corners of the sections of the first type through hole, the second type through hole, the third type through hole and the fourth type through hole are all provided with chamfers.

The cross-section of the groove is an inverted U shape, which is formed by a circular arc and two straight lines tangent to the circular arc.

The centroid connection line of the first row of through holes and the centroid connection line of the second row of through holes are parallel to the upper end surface.

The elastic gasket is a EPDM rubber gasket.

Compared with the prior art, the present invention has the following advantages:

1. Optimizing sealing performance: The present invention obtains a structure with optimal waterproof performance and mechanical properties through the optimized design of the shape and arrangement position of the first row of through holes, the second row of through holes and grooves, and satisfies deep drainage, The waterproof design requirements for the high water pressure resistance of the joints of shield tunnels such as crossing the river and crossing the sea, and at the same time ensuring that they still have a high waterproof capacity under the condition of a certain amount of opening and displacement; the first type of through hole, the second type of There are chamfers at the cross-sectional corners of Type 1, Type 3 and Type 4 through holes to avoid stress concentration at the corners of the holes; There are arc-shaped holes, and the arc-shaped hole structure has good mechanical performance.

2. Reduce the assembly force: the present invention controls the assembling force value of the elastic seal pad within a certain range by controlling the opening ratio of the elastic seal pad, so that it can adapt to the assembly capacity of the existing shield machine and facilitate construction.

3. Simple structure and convenient installation: the present invention has a regular structure and is easy to manufacture, and is suitable for deep drainage under high water pressure, crossing rivers, crossing seas, and other shield tunnel segment joint waterproofing applications.

Description of drawings

Fig. 1 is a schematic cross-sectional structure diagram of the present invention.

Fig. 2 is a distribution diagram of contact stress on the contact surface of the elastic gasket of the embodiment under the condition that the opening amount is 0 mm and the displacement amount is 0 mm.

Fig. 3 is a distribution diagram of contact stress on the contact surface of the elastic gasket of the embodiment under the condition that the opening amount is 8 mm and the displacement amount is 10 mm.

Among them, 1. Gasket body, 2. Groove, 11. End, 12. Support foot, 31. First type through hole, 32. Second type through hole, 33. Third type through hole, 34. The third type through hole Type four through holes.

detailed description

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Example:

Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention.

It should be noted that the structures, proportions, sizes, etc. shown in the drawings attached to this specification are only used to match the content disclosed in the specification, for those who are familiar with this technology to understand and read, and are not used to limit the implementation of the present invention. Limiting conditions, so it has no technical substantive meaning, any modification of structure, change of proportional relationship or adjustment of size, without affecting the effect and purpose of this patent, should still fall within the scope of this patent. The disclosed technical content must be within the scope covered.

The patent will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Example:

As shown in Figure 1, an elastic gasket suitable for waterproofing the segment joints of shield tunnels such as deep drainage, river crossing, and sea crossing is arranged on the segment of the tunnel lining, including upper and lower end faces parallel to each other. The gasket is made of EPDM rubber. The upper end surface is the gasket contact surface, and the lower end surface is the segment contact surface. The line connecting the midpoint of the upper end surface and the midpoint of the lower end surface is the symmetrical axis of the gasket. The length of the upper end surface is 37mm, the length of the lower end surface is 44mm, the outer contour of the end 11 on both sides of the gasket is a broken line, the horizontal distance between the bending point close to the upper end surface and the endpoint of the nearest upper end surface is 2mm, and the broken line is close to the lower end surface The horizontal distance between the bending point and the end point of the nearest lower end face is 2mm, and four grooves 2 are symmetrically arranged on the lower end face to reduce the compression force when the gasket is assembled. The groove 2 is in an inverted U shape. A circular arc and two straight lines tangent to the circular arc are formed. The diameter of the circular arc is 3 mm. The distance between the outer bottom of the groove 2 and the outer bottom of the gasket is 3.5 mm. The distance between the bottom centers of the two grooves 2 is 10 mm. The gasket body 1 is provided with a first row of through holes and a second row of through holes in sequence. The first row of through holes and the second row of through holes respectively contain four holes. All the holes are symmetrical about the symmetry axis of the gasket. The first row of through holes The two first-type through-holes 31 in the middle of the through-hole are in the same form as the two third-type through-holes 33 in the middle of the second row of through-holes. It is composed of a straight line and a straight line parallel to the diameter of the semicircle, in which the two straight lines tangent to the semicircle are respectively connected with the straight line parallel to the diameter of the semicircle through chamfering, and the first row of through holes is located in the two second rows on both sides. The second-type through holes 32 have the same form, and are trapezoidal with corners connected by chamfering. The second row of through holes located on both sides of the fourth type of through holes 34 have the same two forms, both of which are triangles whose corners are connected by chamfering. The line connecting the centroids of the first row of through holes and the centroid of the second row of through holes The connecting lines are all parallel to the upper end surface of the gasket body.

The vertical distance between the centroid line of the first row of through holes and the upper end surface is 5.1 mm, and the vertical distance between the centroid line of the second row of through holes and the upper end surface is 11.4 mm. The diameter of the semicircular arc of the first type through hole 31 is 6.6 mm, and the distance between the centers of the circles is 10 mm. The diameter of the semicircular arc of the third type through hole 33 is 6.6 mm, and the distance between the centers of the circles is 10 mm.

The contact stress distribution diagram of the contact surface of the elastic gasket of the embodiment described in this patent is shown in Figure 2 when the opening amount is 0mm and the displacement amount is 0mm. There are multiple stress peaks on the contact surface, which meets the corresponding high water pressure waterproof design requirements; The contact stress distribution diagram of the contact surface of the elastic gasket in the embodiment described in the patent is shown in Figure 3 when the opening amount is 8mm and the displacement is 10mm. According to the actual engineering waterproof design requirements), it still retains a high waterproof ability.

The elastic gasket requires that the shield assembly equipment can be used to press the gasket to the closed state during assembly. In this example, the double-channel gasket is in the closed state when the compression amount reaches 14mm. The elastic gasket with good performance should have the performance of relatively small assembly force in the closed state to ensure the stability of the concrete trench, and is suitable for deep drainage, cross-river, sea-crossing and other shield tunnel segment joint waterproof elasticity The assembly force value of the gasket must be controlled within a certain range, so as to adapt to the assembly capacity of the existing shield machine.

The above-mentioned embodiments only illustrate the principles and effects of the present invention, but are not intended to limit the present invention. Anyone skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical ideas disclosed in the present invention shall still be covered by the claims of the present invention.

Claims (7)

1. a kind of deep layer draining duct pieces of shield tunnel seam waterproof elastic sealing gasket, for two adjacent tunnel duct piece seam crossings Sealing, the upper surface of the elastic sealing gasket is parallel with lower surface, and upper surface mutually compresses sealing, and lower surface is arranged on tunneltron In the mounting groove of piece, it is characterised in that the elastic sealing gasket is symmetrical with the midpoint line of upper and lower end face, including being integrally formed Sealing pad body (1), two ends for being arranged on the left and right sides (11) and it is multiple support foot (12), described sealing advance capital for Be provided with the first exhausting hole and the second exhausting hole on body (1) side by side successively, described end (11) and support between foot (12) and Groove (2) is opened up between adjacent support foot (12), described end (11) and the bottom surface of support foot (12) collectively forms down End face.

2. a kind of deep layer draining duct pieces of shield tunnel seam waterproof elastic sealing gasket according to claim 1, its feature exists In the first described exhausting hole includes the first type through hole (31) and the Second-Type through hole (32) being arranged side by side, the first described type Through hole (31) and Second-Type through hole (32) are set gradually from inside to outside centered on the line of midpoint, and the second described exhausting hole includes The 3rd type through hole (33) being arranged side by side and the 4th type through hole (34), described the 3rd type through hole (33) and the 4th type through hole (34) Set gradually from inside to outside centered on the line of midpoint.

3. a kind of deep layer draining duct pieces of shield tunnel seam waterproof elastic sealing gasket according to claim 2, its feature exists In the first described type through hole (31) is section by two tangent side lines of a semi arch and semi arch and connection two The through hole of bar side line and the arched door type formed with the base of semi arch diameter parallel, the section of described Second-Type through hole (32) For a right-angled trapezium, the 3rd described type through hole (33) shape is identical with the first type through hole (31), and with the first type through hole (31) It is inverted each other, the section of the 4th described type through hole (34) is a right angled triangle.

4. a kind of deep layer draining duct pieces of shield tunnel seam waterproof elastic sealing gasket according to claim 1, its feature exists In the section of described the first type through hole (31), Second-Type through hole (32), the 3rd type through hole (33) and the 4th type through hole (34) is turned Chamfering is equipped with angle.

5. a kind of deep layer draining duct pieces of shield tunnel seam waterproof elastic sealing gasket according to claim 1, its feature exists In the section of described groove (2) is in inverted U, is formed by one section of circular arc and two straight lines tangent with circular arc.

6. a kind of deep layer draining duct pieces of shield tunnel seam waterproof elastic sealing gasket according to claim 1, its feature exists It is parallel with upper surface in, the centre of form connecting line of described the first exhausting hole and the centre of form connecting line of the second exhausting hole.

7. a kind of deep layer draining duct pieces of shield tunnel seam waterproof elastic sealing gasket according to claim 1, its feature exists In described elastic sealing gasket is EPT rubber packing pad.