Waterproof sealing gasket for shield tunnel segment joint

Abstract

The utility model relates to the field of shield tunnel waterproofing, in particular to a shield tunnel segment joint waterproof sealing gasket. The sealing gasket body is made of ethylene propylene diene monomer, the cross section of the sealing gasket body is in a shoulder shape with the narrow top and bottom and the wide middle, and water-swelling rubber sheets integrally formed with the sealing gasket body in a heat vulcanization mode are arranged at the top and the bottom of the middle foot portion. Two rows of symmetrical through holes are formed in the inner part, and two inverted U-shaped holes are formed in the lower end surface, so that a middle foot part and a supporting foot part are formed. According to the sealing gasket, the water swelling rubber sheet swells in water to compensate the contact area after the joint is opened, and the waterproof performance is improved; the anti-stripping capability of the bonding surface is enhanced through heat vulcanization integral forming; the special hole design avoids stress concentration and optimizes the stress performance. The pipe piece joint leakage problem under the high water pressure is effectively solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the shield method tunnel waterproof field especially a kind of sealing gasket of shield tunnel segment joint single pass waterproof under high water pressure condition. BACKGROUND

[0002] In the construction of multi-level rail transit in metropolitan area, shield method tunnel crosses mountainous area, and avoids city deep obstacles, and the situation appears sometimes, with the characteristics of tunnel buried depth is big, water head pressure is high.When using large diameter single-hole double-line shield method tunnel, tunnel segment thickness is bigger, and segment joint waterproof often uses larger size waterproof sealing gasket, double-pass waterproof sealing gasket and other measures to resist the influence of high water pressure, when using single-hole single-line tunnel, the thickness of tunnel segment is smaller, and segment joint waterproof often uses smaller size single-pass waterproof sealing gasket, and still needs to meet the waterproof performance requirements of segment joint under high water pressure condition.

[0003] In engineering practice, leakage of segment joint position mainly occurs at the contact surface of sealing gasket and sealing gasket, and the contact surface of sealing gasket and segment sealing gasket groove. The leakage between sealing gasket and sealing gasket is mainly due to the opening of segment joint, which reduces the closed contact stress between sealing gaskets. When the closed contact force is less than the environmental water pressure, leakage occurs. The leakage between sealing gasket and sealing gasket groove is mainly due to the non-planar contact state between the contact surfaces of sealing gasket, which expands the opening of sealing gasket and segment sealing gasket groove, and the friction force between the contact surfaces of sealing gasket during segment assembly is transmitted to the contact surface between sealing gasket and segment sealing gasket groove, and exceeds the adhesion of the contact surface, which causes the opening of the joint, reduces the closed contact force between sealing gasket and segment sealing gasket groove, and causes leakage when the closed contact force is less than the environmental water pressure. UTILITY MODEL CONTENTS

[0004] In order to solve the problem of leakage of sealing gasket contact surface, the present scheme provides a smaller size shield tunnel segment joint waterproof sealing gasket, which compensates for the contact area after the opening of sealing gasket, improves the waterproof performance of shield tunnel segment joint, and meets the waterproof requirements of shield tunnel segment joint under high water pressure condition under the condition of only setting one segment joint waterproof sealing gasket.

[0005] In order to achieve the above purpose, the utility model adopts the technical scheme:

[0006] The utility model provides a kind of shield tunnel segment joint waterproof sealing gasket, including two mutually compressing seals sealing gasket body being arranged in the sealing gasket groove of both sides of tunnel segment joint, the outer surface of sealing gasket body includes linear upper end face, lower end face parallel with upper end face, and the broken line shape side profile surface connecting the side edge of upper end face and lower end face respectively, the lower end face is provided with two inverted U-shaped holes symmetrically left and right, and the middle foot is formed between two inverted U-shaped holes, and each inverted U-shaped hole is formed with a support foot between adjacent side profile surface, the inside of sealing gasket body is sequentially provided with two rows of through holes symmetrically left and right from top to bottom, first row of through holes includes the first circular hole being arranged above inverted U-shaped hole and middle foot, and second row of through holes includes the second circular hole being arranged in middle foot;The broken line shape side profile surface is three broken lines.

[0007] Further, the linear distance between the upper end points A1, A2 of the side profile surfaces on both sides is less than the linear distance between the intermediate turning points B1, B2 near the upper part, the linear distance between the intermediate turning points B1, B2 near the upper part is less than the linear distance between the lower end points D1, D2, and the linear distance between the lower end points D1, D2 is less than the linear distance between the intermediate turning points C1, C2 near the lower part, and the sealing gasket body has a shoulder shape with a narrow upper part and a wide lower part.

[0008] Further, the first circular holes have the same diameter, the center lines are located on the same straight line and are parallel to the upper end face of the sealing gasket body.

[0009] Further, the second circular holes have the same diameter, the center lines are located on the same straight line and are parallel to the upper end face of the sealing gasket body.

[0010] Further, the profile line of the inverted U-shaped hole includes a top straight line, a side straight line, and a connecting circular arc tangent to the top straight line and the side straight line.

[0011] Further, the sealing gasket body is made of ethylene-propylene-diene rubber, the top is a water-swelling rubber sheet, and the bottom of the middle foot is a water-swelling rubber sheet.

[0012] Further, the sealing gasket body and the water-swelling rubber sheet are integrally formed by heat vulcanization.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] The sealing gasket body is made of ethylene-propylene-diene rubber, and the water-swelling rubber sheet is integrally formed by heat vulcanization. The above connection mode makes the combination of the two more compact, has better peel resistance of the bonding surface, effectively avoids the separation of the water-swelling rubber sheet and the sealing gasket body during use, ensures the stability and reliability of the overall performance of the sealing gasket, and further guarantees the waterproof effect.

[0015] The water-swelling rubber sheet is arranged on the top of the sealing gasket body and the bottom of the middle foot. When the pipe piece joint is opened, the water-swelling rubber sheet swells in water, which can compensate the contact area between the sealing gaskets and the contact area between the sealing gasket and the sealing gasket groove, effectively solve the leakage problem caused by the reduction of the contact area and the reduction of the contact stress due to the opening of the joint, and enhance the waterproof performance of the pipe piece joint, meet the waterproof requirements of the pipe piece joint of the shield tunnel under high water pressure.

[0016] The through hole in the sealing gasket body is circular, and the top straight line and the side straight line of the inverted U-shaped hole are connected by tangent circular arcs. The above design avoids stress concentration at the corner of the hole, so that the hole structure has good stress performance. Under the complex stress conditions of high water pressure and pipe piece assembly, the sealing gasket can better withstand pressure and is not easy to be damaged due to stress concentration, thereby prolonging the service life of the sealing gasket and indirectly improving the waterproof durability of the pipe piece joint. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a sealing gasket cross section schematic view of a specific embodiment of the utility model;

[0018] Figure 2 It is a sealing gasket cross section size schematic view of a specific embodiment of the utility model;

[0019] Figure 3 It is a closed compression force curve diagram of a specific embodiment of the utility model.

[0020] Reference numerals in the drawings:

[0021] 1, sealing gasket body; 11, upper end face; 12, lower end face; 13, side profile; 21, inverted U-shaped hole; 22, middle foot; 23, supporting foot; 31, first circular hole; 32, second circular hole; 41, top water-swelling rubber sheet; 42, middle foot bottom water-swelling rubber sheet; A1, left side profile upper end point; A2, right side profile upper end point; B1, left side profile upper fold point; B2, right side profile upper fold point; C1, left side profile lower fold point; C2, right side profile lower fold point; D1, left side profile lower end point; D2, right side profile lower end point. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the embodiment clearer, the technical scheme in the embodiment will be described clearly and completely below in combination with the drawings in the embodiment. Obviously, the described embodiment is part of the sealing gasket of the single-channel waterproof of the pipe piece joint of the shield tunnel under high water pressure, but not all the embodiments.

[0023] Please refer to Figure 1 , Figure 1The utility model discloses a sealing gasket body 1 is set in the sealing gasket groove of tunnel segment joint two sides, and the sealing gasket body 1 is pressed tightly and sealed mutually, and the outer surface of sealing gasket body 1 includes the upper end face 11 of linear type, the lower end face 12 parallel with the upper end face and the broken line shape side profile 13 connected with the side edge of upper end face and lower end face respectively.

[0024] Two inverted U-shaped holes 21 are symmetrically arranged on the left and right of the lower end face, and a midfoot portion 22 is formed between the two inverted U-shaped holes 21, and a support foot portion 23 is formed between each inverted U-shaped hole 21 and the adjacent side profile 13, and two rows of through holes symmetrically arranged on the left and right are sequentially arranged inside the sealing gasket body 1 from top to bottom, the first row of through holes includes four circular holes 31 arranged above the inverted U-shaped hole 21 and the midfoot portion 22, and the second row of through holes includes two circular holes 32 arranged in the midfoot portion 22.

[0025] The four circular holes 31 in the first row have the same diameter, the center lines of the four circular holes 31 are located on the same straight line, and the center lines of the four circular holes 31 are parallel to the upper end face 11 of the sealing gasket body 1. The two circular holes 32 in the second row have the same diameter, the center lines of the two circular holes 32 are located on the same straight line, and the center lines of the two circular holes 32 are parallel to the upper end face 11 of the sealing gasket body 1.

[0026] The profile line of the inverted U-shaped hole 21 includes a top straight line, a side straight line, and a connecting arc which is tangent to the top straight line and the side straight line.

[0027] The broken line shape side profile 13 is a three-fold broken line, the straight line distance between the two side profiles 13 at the upper end points A1 and A2 is less than the straight line distance between the intermediate turning points B1 and B2 close to the upper part, the straight line distance between the intermediate turning points B1 and B2 close to the upper part is less than the straight line distance between the lower end points D1 and D2, the straight line distance between the lower end points D1 and D2 is less than the straight line distance between the intermediate turning points C1 and C2 close to the lower part, and the sealing gasket body 1 has a shoulder shape with a narrow upper part and a wide lower part.

[0028] The sealing gasket body 1 is made of ethylene propylene diene rubber, the top part of the sealing gasket body 1 is a water-swelling rubber sheet 41, and the bottom part of the midfoot portion 22 is a water-swelling rubber sheet 42. The sealing gasket body 1 and the water-swelling rubber sheet 41 are integrally formed through hot vulcanization, and the sealing gasket body 1 and the water-swelling rubber sheet 42 are integrally formed through hot vulcanization.

[0029] Please refer to Figure 2 , the straight line distance between the side profiles 13 at the upper end points A1 and A2 is 32 mm, the straight line distance between the side profiles 13 at the intermediate turning points B1 and B2 is 37 mm, the straight line distance between the side profiles 13 at the intermediate turning points C1 and C2 is 43 mm, and the straight line distance between the side profiles 13 at the lower end points D1 and D2 is 40 mm.

[0030] The distance between the bottom end points of the side straight lines of each inverted U-shaped hole 21 profile is 9mm, the distance between the top end points of the side straight lines is 7.6mm, the distance between the two side end points of the top straight line is 4.6mm, and the radius of the connecting arc tangent to the bottom of the side straight line and the end of the top straight line is 1.5mm.

[0031] The bottom width of the midfoot portion 22 is 16mm, and the bottom width of each branch foot portion 23 is 3mm.

[0032] The vertical distance between the upper end point A1 of the side profile surface 13 and the intermediate turning point B1 is 11mm, the vertical distance between the intermediate turning point B1 and the intermediate turning point C1 is 3mm, and the vertical distance between the intermediate turning point C1 and the lower end point D1 is 8mm.

[0033] The radius of the four circular holes 31 of the first row of through holes is 8mm, the center distance of the two middle circular holes is 9mm, and the center distance between the side circular holes and the adjacent circular holes of the first row of through holes is 8mm. The radius of the two circular holes 32 of the second row of through holes is 8mm, and the center distance of the two circular holes is 8mm.

[0034] The thickness of the water-swelling rubber sheet 41 is 2mm, the vertical distance between the bottom of the water-swelling rubber sheet 41 and the top of the four circular holes 31 of the first row of through holes is 2.5mm, the vertical distance between the center of the four circular holes 31 of the first row of through holes and the center of the two circular holes 32 of the second row of through holes is 8.5mm, the vertical distance between the bottom of the two circular holes 32 of the second row of through holes and the water-swelling rubber sheet 42 is 1.0mm, and the thickness of the water-swelling rubber sheet 42 is 2mm.

[0035] In the embodiment, the hardness of the sealing gasket material is Shore 65 degrees, the hardness of the water-swelling rubber is Shore 42 degrees, and the water pressure resistance is 3.2MPa when the joint opening amount is 6mm and the joint misalignment amount is 10mm.

[0036] Please refer to Figure 3 The shield assembly equipment used during the assembly of the segment should be able to press the sealing gasket at the segment joint position to a closed state, and a good sealing gasket should have the advantage of smaller assembly force under the closed state. In the example, the sealing gasket compression amount reaches 10mm when the segment joint is in the closed state. The elastic sealing gasket assembly force test result shows that the assembly force under the closed state is less than 52KN / m, which meets the requirement that the assembly closed pressure is not greater than 60kN / m.

[0037] Through the above-mentioned embodiments, the reliable waterproofing of the single-channel sealing gasket under high water pressure is realized, and the characteristics of lightweight structure and performance optimization are combined. The specific size parameters and material selection can be adjusted according to the actual engineering requirements.

Claims

1. A waterproof sealing gasket for a shield tunnel segment joint, comprising two sealing gasket bodies (1) arranged in a sealing gasket groove on both sides of the tunnel segment joint and pressed against each other, the outer surface of the sealing gasket body (1) comprising a straight upper end surface (11), a lower end surface (12) parallel to the upper end surface, and a broken line shaped side profile surface (13) connecting the side edges of the upper end surface and the lower end surface respectively; characterized in that, The lower end face is provided with two inverted U-shaped holes (21) symmetrically left and right, and a midfoot (22) is formed between the two inverted U-shaped holes (21), and a support foot (23) is formed between each inverted U-shaped hole (21) and the adjacent side contour surface (13), the sealing gasket body (1) is provided with two rows of through holes symmetrically left and right from top to bottom, the first row of through holes includes first circular holes (31) arranged above the inverted U-shaped holes (21) and the midfoot (22), and the second row of through holes includes second circular holes (32) arranged in the midfoot (22); the broken line-shaped side contour surface (13) is a three-fold broken line.

2. The shield tunnel segment joint waterproof sealing pad according to claim 1, characterized in that, The straight line distance between the side contour surfaces (13) on both sides between the upper end points A1 and A2 is less than the straight line distance between the intermediate turning points B1 and B2 close to the upper part, the straight line distance between the intermediate turning points B1 and B2 close to the upper part is less than the straight line distance between the lower end points D1 and D2, and the straight line distance between the lower end points D1 and D2 is less than the straight line distance between the intermediate turning points C1 and C2 close to the lower part, and the sealing gasket body (1) is in a shoulder type with a narrow upper part and a wide lower part.

3. The waterproofing sealant for shield tunnel segment joints according to claim 1, characterized in that, The first circular holes (31) have the same diameter, the center lines are located on the same straight line, and are parallel to the upper end face (11) of the sealing gasket body (1).

4. The waterproofing sealant for shield tunnel segment joints according to claim 1, wherein, The second circular holes (32) have the same diameter, the center lines are located on the same straight line, and are parallel to the upper end face (11) of the sealing gasket body (1).

5. The waterproofing sealant for shield tunnel segment joints according to claim 1, wherein, The profile line of the inverted U-shaped hole (21) includes a top straight line, a side straight line, and a connecting circular arc tangent to the top straight line and the side straight line.

6. The waterproofing sealant for shield tunnel segment joints according to claim 1, wherein, The top of the sealing gasket body is a water-swelling rubber sheet (41), and the bottom of the midfoot (22) is a water-swelling rubber sheet (42).

7. The waterproofing sealant for shield tunnel segment joints according to claim 1, wherein, The sealing gasket body (1) and the water-swelling rubber sheet (41) are integrally formed by hot vulcanization, and the sealing gasket body (1) and the water-swelling rubber sheet (42) are integrally formed by hot vulcanization.

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