Active elastic compression rubber sealing gasket for shield segment of water conveyance tunnel in hydraulic engineering

Abstract

The utility model relates to the technical field of water prevention and drainage of shield segments of long, large and deep-buried hydraulic tunnels, in particular to an active elastic compression rubber sealing gasket for shield segments of hydraulic water delivery tunnels. The sealing gasket placing platform is connected to the bottom of the hole opening through a tiny elastic structure, and an elastic sealing gasket is installed on the sealing gasket placing platform. According to the active elastic compression rubber sealing gasket for the shield segment of the hydraulic water delivery tunnel, the problems that in the prior art, due to the fact that material compression counter-force is insufficient, the compression volume of the sealing gasket is insufficient, the elastic sealing gasket is aged and fails after being used for a long time, and the sealing gasket falls off due to the segment structure splicing problem are effectively solved; the waterproof performance, the reliability and the durability are excellent, and a powerful guarantee is provided for safe and stable operation of the hydraulic tunnel.

Description

TECHNICAL FIELD

[0001] The utility model relates to long big deep bury hydraulic tunnel shield segment waterproof drainage technical field, concretely relates to a kind of hydraulic water conveyance tunnel shield segment active type elastic compression rubber sealing pad. BACKGROUND

[0002] As an important part of water conservancy construction, hydraulic tunnel has developed rapidly in China due to its short mileage, less environmental damage and low interference. However, with the gradual shift of tunnel construction focus to complex geological conditions, tunnel construction faces multiple challenges such as complex structure, changing environment, high water pressure and frequent disasters. Shield tunneling technology has been widely used in tunnel construction due to its high degree of mechanization, rapid and safe excavation, and less construction disturbance.

[0003] The shield tunnel lining structure is composed of segments and joints, and the existence of joints weakens the longitudinal and transverse stiffness and strength of the overall structure and local segment structure of the tunnel, becoming a weak link in waterproof sealing. Leakage at the joint has been a common problem in shield tunnel projects and is difficult to eradicate. Leakage not only causes cracks, accelerated erosion, uneven settlement, fatigue damage and other problems, but also seriously affects the durability and normal use of the tunnel, and may cause water resource waste and environmental pollution.

[0004] Currently, the shield tunnel segment joint waterproof mainly uses porous EPDM (Ethylene Propylene Diene Rubber) material elastic sealing pad. This sealing pad deforms by compressing the sealing pad during segment assembly to fill the uneven gaps in the joint and maintain the durability and density of the gap through friction and elastic force, thereby achieving the effect of blocking the leakage channel. However, in actual application, such sealing pads have uneven quality and rubber aging problems. After long-term use, the elasticity of EPDM sealing pad may not meet the requirements, resulting in reduced waterproof performance at the joint. In addition, the joint opening and misalignment that may occur during shield segment assembly can also cause the sealing pad to be subjected to longitudinal compression force and transverse friction force, which can cause stretching deformation or even fall off, thereby affecting its sealing performance.

[0005] Therefore, the existing hydraulic tunnel shield segment joint waterproof structure needs to be improved to solve the problems of insufficient material compression force, insufficient sealing pad compression volume, aging and failure of elastic sealing pad after long-term use, and sealing pad falling off due to segment structure assembly problems. The present invention is a new type of hydraulic water conveyance tunnel shield segment active elastic compression rubber sealing pad, which aims to improve the waterproof performance at the joint through innovative design and ensure the safe and stable operation of the tunnel. SUMMARY

[0006] In order to solve the above problems, the utility model provides a kind of water conservancy water tunnel shield segment active type elastic compression rubber sealing pad, the water conservancy water tunnel shield segment active type elastic compression rubber sealing pad effectively solves the joint elastic sealing pad in prior art due to material compression reaction force deficiency, sealing pad compression volume is not enough, elastic sealing pad long time use aging failure and due to segment structure assembly problem leads to sealing pad drop-off and various problems;With excellent waterproof performance, reliability and durability, provide strong guarantee for the safe and stable operation of water tunnel.

[0007] The technical scheme of the utility model is as follows:

[0008] A kind of water conservancy water tunnel shield segment active type elastic compression rubber sealing pad, trapezoidal prism type orifice is provided in the concrete material of two joint pipe rings, sealing pad installation platform is connected in the bottom of orifice by small elastic structure, and elastic sealing pad is installed on sealing pad installation platform;Effectively increase the compression reaction force of sealing pad, improve the waterproof performance of joint, solve the leakage problem caused by the insufficient compression reaction force of the joint elastic sealing pad in the prior art.

[0009] Several compressible circular holes are provided in the elastic sealing pad;When it is subjected to pressure, it can better fill the uneven gap in the joint, and at the same time, these holes can also generate internal stress in the deformation process of the sealing pad, further enhancing the extrusion water-stopping effect at the joint.

[0010] Mutually matched elastic water-blocking holes and rigid water-blocking plugs are respectively provided in the contact surfaces of the elastic sealing pads on both sides;The matched design of elastic water-blocking holes and rigid water-blocking plugs can increase the compactness of the gap, improve the integrity of the elastic sealing pads on both sides during the assembly of adjacent segments, prevent the sealing pad from falling off due to aging, hardening and other reasons during long-term use, and thus enhance the waterproof performance of the joint.

[0011] Water-swelling rubber strips are provided at both ends of the contact surfaces of the elastic sealing pads on both sides;The water-swelling rubber strips can swell rapidly after encountering water, fill the fine holes in the joint, further enhance the sealing effect of the gap, and cope with various leakage situations that may occur in the tunnel, ensuring the waterproof performance of the joint.

[0012] A film protective sleeve is provided on the surface of the water-swelling rubber strip;The film protective sleeve can protect the water-swelling rubber strip from swelling prematurely due to the humid environment of the tunnel before installation is completed, ensuring that the rubber strip can function normally when needed, and improving the reliability and durability of the joint waterproof structure.

[0013] The small elastic structure is a spring or an elastic rubber protrusion.

[0014] The circular holes are uniformly distributed in the elastic sealing pad, and the aperture size is in a positive proportional relationship with the thickness of the sealing pad.

[0015] The water blocking plug is made of stainless steel or high-strength engineering plastic.

[0016] The inclined angle of the trapezoidal frustum-shaped orifice is 45-60 degrees.

[0017] The elastic sealing pad is made of ethylene propylene diene rubber.

[0018] The utility model discloses the beneficial effect lies in:

[0019] 1. The utility model discloses a water conservancy water conveying tunnel shield segment active type elastic compression rubber sealing pad, and the water conservancy water conveying tunnel shield segment active type elastic compression rubber sealing pad provides additional active pressure for the elastic sealing pad through the design of the tiny elastic structure at the bottom of the sealing pad structure, effectively increases the compression reaction force of the sealing pad, makes the joint be able to generate greater internal stress when being subjected to external force, thereby realizes the effect of active extrusion water stop, and significantly improves the waterproof performance of the joint.

[0020] 2. The utility model discloses a water conservancy water conveying tunnel shield segment active type elastic compression rubber sealing pad, and the water conservancy water conveying tunnel shield segment active type elastic compression rubber sealing pad is provided with a plurality of compressible circular holes in the elastic sealing pad, these holes can deform when being subjected to pressure, thereby increasing the deformability and compressibility of the sealing pad, making the sealing pad can better adapt to the uneven gap at the joint, and improving the adaptability and waterproof effect of the sealing pad.

[0021] 3. The utility model discloses a water conservancy water conveying tunnel shield segment active type elastic compression rubber sealing pad, and the water conservancy water conveying tunnel shield segment active type elastic compression rubber sealing pad is provided with water-swelling rubber strips at the two ends of the contact surface of the sealing pad, when water seepage appears in the tunnel, the rubber strips can swell rapidly and fill the tiny holes at the joint, not only enhancing the sealing effect at the joint, but also effectively preventing the problems of water resource waste and environmental pollution outside the tunnel.

[0022] 4. The utility model discloses a water conservancy water conveying tunnel shield segment active type elastic compression rubber sealing pad, and the water conservancy water conveying tunnel shield segment active type elastic compression rubber sealing pad is provided with a film protective sleeve on the surface of the water-swelling rubber strip, ensuring that the rubber strip does not swell and fail in advance due to the humid environment of the tunnel before installation is completed, guaranteeing that the rubber strip can normally play a role when needed, and improving the reliability and durability of the sealing pad.

[0023] 5、The utility model discloses a kind of water conservancy water conveyance tunnel shield segment active type elastic compression rubber sealing pad, the water conservancy water conveyance tunnel shield segment active type elastic compression rubber sealing pad is provided with a plurality of elastic water stop holes and rigid water stop plug on sealing pad surface, increase the compactness of gap, and improve the integrity of two sides elastic sealing pad when adjacent segment assembly, effectively avoid the phenomenon that waterproof pad is detached due to segment structure assembly problem, ensure the stability and security of tunnel structure.

[0024] 6、The utility model discloses a kind of water conservancy water conveyance tunnel shield segment active type elastic compression rubber sealing pad, the water conservancy water conveyance tunnel shield segment active type elastic compression rubber sealing pad is made of EPDM and other high-quality materials, with good anti-aging, corrosion resistance and wear resistance, so that sealing pad can adapt to various complex geological conditions and construction environment, ensure the waterproof performance of tunnel in long-term use process. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is the structure schematic view before compression of a kind of water conservancy water conveyance tunnel shield segment active type elastic compression rubber sealing pad of the utility model embodiment;

[0026] Figure 2 It is the structure schematic view after compression of a kind of water conservancy water conveyance tunnel shield segment active type elastic compression rubber sealing pad of the utility model embodiment;

[0027] Components represented by various reference signs in the drawings are:

[0028] The utility model:1, elastic sealing pad, 2, segment ring gap side concrete material, 3, micro elastic structure, 4, round hole, 5, water-swelling rubber strip, 6, film protection sleeve, 7, water-blocking hole, 8, sealing pad placement platform, 9, orifice, 10, water stop plug. DETAILED DESCRIPTION

[0029] The utility model will be further described in detail by specific implementation mode in conjunction with the drawings. Wherein similar elements in different implementation modes adopt relevant similar element reference. In the following implementation mode, many details are described so that the present application can be better understood. However, those skilled in the art can easily realize that part of features can be omitted in different cases, or can be replaced by other elements, materials, methods. In some cases, some operations related to the present application are not shown or described in the specification, in order to avoid that the core part of the present application is overwhelmed by too much description, and for those skilled in the art, detailed description of related operation is not necessary, they can complete understanding of related operation according to the description in the specification and general technical knowledge in the art.

[0030] In addition, features described in the specification, operations or characteristics can be combined in any appropriate manner to form various embodiments. Meanwhile, the steps or actions in the method description can also be sequentially changed or adjusted in a manner that can be apparent to those skilled in the art. Therefore, the various sequences in the specification and drawings are only for the purpose of clearly describing a certain embodiment, and do not mean that the sequence is necessary, unless otherwise stated that a certain sequence must be followed.

[0031] The serial numbers of the components in this paper, such as "first", "second", etc., are only used to distinguish the described objects, and do not have any order or technical meaning. The "connection" and "coupling" in this application include direct and indirect connections (couplings) unless otherwise specified.

[0032] As shown in Figure 1 and Figure 2 , the shield segment of the water tunnel of the hydraulic water tunnel includes the following core components:

[0033] Elastic sealing pad 1: made of ethylene propylene rubber, with a plurality of compressible circular holes 4 uniformly distributed inside, for generating internal stress by deformation under pressure, enhancing the joint extrusion water stop effect;

[0034] Sealing pad installation platform 8: made of galvanized steel plate or glass fiber reinforced nylon, with anti-slip texture on the surface, connected to the bottom of the trapezoidal prism orifice 9 through a plurality of small elastic structures 3 (such as springs or elastic rubber protrusions);

[0035] Water blocking groove 7 and water blocking plug 10: respectively provided in the contact surface of the elastic sealing pad 1, wherein the rigid water blocking plug 10 is made of stainless steel or high-strength engineering plastic, and its cross-sectional shape matches the reserved rubber water blocking groove 7, and forms a tight fit by extrusion;

[0036] Water-swelling rubber strip 5: set at the outer surface edge of the elastic sealing pad 1, composed of water-swelling water stop strip and thin film rubber protective sleeve 6, with a water-swelling rate ≥ 150%, and a hardness of 60-80 after swelling.

[0037] Trapezoidal prism orifice 9: opened on the connected segment ring joint side concrete material 2, with an angle of 45°-60°, for limiting the transverse displacement of the sealing pad and adapting the installation direction.

[0038] In the specific implementation, according to the shield segment assembly characteristics, the shield segment is assembled in a ring from bottom to top and from hole outside to hole inside. When the ring of segments is stably arranged on the wall, the support frame of the shield machine is pressed against the innermost ring of segments, the rock is broken by the rotating cutter head at the front end of the shield machine, and a new tunnel working face is formed by pushing into the hole. The shield machine support is lowered, and the assembly of the next ring of segments is started again. The segment joint waterproof structure designed in the application is also designed according to the characteristics of the process.

[0039] For the active elastic compression type rubber sealing gasket structure, the elastic sealing gasket and the bottom elastic platform are in a natural relaxed state in a natural state, and the rubber sealing gasket protrudes from the ring joint boundary. When a ring of segments is assembled, the waterproof rubber protective sleeve wrapped around the water-swelling rubber strip at the ring joint of the entire ring of segments is manually broken, so that the water-swelling rubber strip is exposed to the natural environment. Then, the assembly of the next ring of segments is quickly started. Through the mutual extrusion of the rubber sealing gaskets at the adjacent ring joints of the shield machine, the bottom elastic platform is compressed, which provides sufficient support reaction force for the rubber sealing gasket. The water-swelling rubber strip is also pre-pressed in this process. The rigid water-blocking plug provided on the surface of the rubber sealing gasket is extruded into the reserved water-blocking hole by the pressure provided by the shield machine until the ring joints of the two segments are tightly sealed. At this time, the active elastic compression type rubber sealing gasket forms an integral structure, cutting off the groundwater seepage channel, and thus the shield segment joint waterproof structure is successfully formed.

[0040] It should be emphasized that the elastic sealing gasket and the sealing gasket placement platform are connected by fixed connection or other sealing connection at the beveled position, otherwise the underground water seepage channel is easy to form in the use process.

[0041] The installation steps of the active elastic compression rubber sealing gasket of the water conveyance tunnel shield segment are as follows:

[0042] Step one: segment pre-positioning

[0043] The active elastic compression rubber sealing gasket is pre-positioned in the trapezoidal prism hole 9 inside the ring joint of the shield segment. At this time, the elastic sealing gasket 1 and the bottom micro elastic structure 3 are in a natural relaxed state, and the sealing gasket protrudes from the ring joint boundary.

[0044] Step two: activating the water-swelling rubber strip 5

[0045] When a ring of segments is assembled, the film protective sleeve 6 on the surface of the water-swelling rubber strip 5 is manually broken, so that it is exposed to the external environment.

[0046] Step three: adjacent segment extrusion assembly

[0047] By shield machine push next ring segment, make the elastic sealing pad 1 of adjacent segment extrude each other, in this process: rigid water stop 10 is embedded in the reserved rubber water stop groove 7 under the action of pressure, form tight fitting, improve the integrity of joint; Small elastic structure 3 is compressed, provides sustained active pressure for elastic sealing pad 1, enhances compression reaction force (5-10MPa); The circular hole 4 is extruded and deformed, releases internal stress to fill the uneven gap of joint; The water-swelling rubber strip 5 is pre-compressed, and after subsequent water-swelling, it can further fill the fine leakage channel;

[0048] Step four: joint sealing is completed

[0049] When the two segment ring joints are tightly sealed, the elastic sealing pad 1 is completely compressed (deformation 25%-30%), the rigid water stop 10 is completely embedded with the reserved rubber water stop groove 7, the water-swelling rubber strip 5 is in the activated state, forming an integrated sealing structure, completely blocking the groundwater seepage path;

[0050] The utility model is suitable for various high water pressure, complex geological hydraulic tunnel engineering, wide application range can effectively solve the leakage problem caused by the compression reaction force deficiency, aging failure and misassembly of traditional elastic sealing pad.

[0051] The above application of specific examples is used to describe the utility model, which is only used to help understand the utility model, and does not limit the utility model. For the skilled person in the art to which the utility model belongs, according to the idea of the utility model, a number of simple deductions, deformations or substitutions can be made.

Claims

1. A shield segment active elastic compression rubber gasket for water conveyance tunnel, characterized in that, The concrete material (2) on the side of the joint of two adjacent segments is provided with a trapezoidal prism shaped orifice (9), a sealing gasket setting platform (8) is connected to the bottom of the orifice (9) through a micro elastic structure (3), and an elastic sealing gasket (1) is installed on the sealing gasket setting platform (8).

2. A shield segment active elastic compression rubber gasket for water conveyance tunnel of hydraulic engineering as claimed in claim 1, characterized in that, A plurality of compressible circular holes (4) are arranged in the elastic sealing gasket (1).

3. A shield segment active elastic compression rubber gasket for water conveyance tunnel as claimed in claim 1, wherein, A mutually matched elastic water blocking hole (7) and a rigid water blocking plug (10) are arranged in the contact surface of the elastic sealing gaskets (1) on both sides.

4. A shield segment active elastic compression rubber gasket for water conveyance tunnel as claimed in claim 1, wherein, Water swelling rubber strips (5) are arranged at the ends of the contact surface of the elastic sealing gaskets (1) on both sides.

5. A water conveyance tunnel shield segment active elastic compression rubber gasket as claimed in claim 4, characterized in that, Film protective sleeves (6) are arranged on the surface of the water swelling rubber strips (5).

6. A shield segment active elastic compression rubber gasket for a water conveyance tunnel, as claimed in claim 1, wherein, The micro elastic structure (3) is a spring or an elastic rubber protrusion.

7. A shield segment active elastic compression rubber gasket for a water conveyance tunnel, according to claim 2, characterized in that, The circular holes (4) are uniformly distributed in the elastic sealing gasket (1), and the hole diameter is in a positive proportional relationship with the thickness of the sealing gasket.

8. A shield segment active elastic compression rubber gasket for a water conveyance tunnel according to claim 3, wherein The material of the water blocking plug (10) is stainless steel or high-strength engineering plastic.

9. A shield segment active elastic compression rubber gasket for a water conveyance tunnel according to claim 1, wherein, The angle of the inclined surface of the trapezoidal prism shaped orifice (9) is 45°-60°.

10. A shield segment active elastic compression rubber gasket for a water conveyance tunnel, as claimed in claim 1, wherein, The material of the elastic sealing gasket (1) is ethylene propylene diene rubber.

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