Flat bottom gasket special for underground excavation tunnel joint

Abstract

The utility model provides a flat-bottom gasket special for a subsurface tunnel node. The flat-bottom gasket comprises a gasket body with a circular cross section, and a circular groove part which is arranged at the circle center of the gasket body and surrounds the circle center of the gasket body, a threaded positioning hole is formed in the circle center of the circular groove part located on the top face of the gasket body, and an annular supporting piece part extending in the radial direction is arranged on the top face of the gasket body and surrounds the outer edge of the circular groove part. The top face of the supporting piece part is an inclined face extending downwards from the outer edge of the circular groove part, and the bottom face of the tail end of the supporting piece part is a plane. And the bottom surface of the tail end of the supporting sheet part is coplanar with the bottom surface of the circular groove part. According to the gasket, it is guaranteed that good plane flatness is formed at the joint of the installed gasket and the geotechnical cloth composite sheet to the maximum extent, then a good working face is provided for follow-up coating spraying construction, and meanwhile indentations of the geotechnical cloth composite sheet caused by the gasket are small.

Description

Technical Field

[0001] The utility model relates to the technical field of waterproof engineering fittings, in particular to a special flat gasket for the nodes of mined tunnels. Background Art

[0002] The special flat gasket for the nodes of mined tunnels is a waterproof cushion layer used for fixing drainage boards, HDPE and geotextile composite sheets, etc. in mined tunnels, which are used for waterproofing, drainage or as the base layer of coating-type waterproof materials.

[0003] For example, in many cases, after the geotextile composite sheet is laid along the surface of the mined tunnel, in order to facilitate the fixation of the geotextile composite sheet, it is necessary to punch holes at multiple position nodes and install gaskets through threaded positioning holes.

[0004] It is found through research that, referring to Figure 1 , the bottom edge of the traditional gasket extends vertically ( Figure 1 at the arrow position in Utility Model Content

[0005] The special flat gasket for the nodes of mined tunnels provided by the utility model can ensure good flatness at the connection between the installed gasket and the geotextile composite sheet, and the indentation is also small, thereby providing a good working surface for the subsequent spraying construction of the coating.

[0006] The special flat gasket for the nodes of mined tunnels provided by the utility model has the following technical solutions:

[0007] The utility model provides a special flat gasket for the nodes of mined tunnels, comprising:

[0008] a gasket body with a circular cross-sectional shape, and a circular groove portion arranged around its center at the center of the gasket body;

[0009] a threaded positioning hole is arranged at the center of the circular groove portion on the top surface of the gasket body, and an annular support piece portion extending radially is arranged on the top surface of the gasket body and around the outer edge of the circular groove portion;

[0010] the top surface of the support piece portion is an inclined surface extending downward from the outer edge of the circular groove portion, and the bottom surface of the end of the support piece portion is a plane; and the bottom surface of the end of the support piece portion is coplanar with the bottom surface of the circular groove portion.

[0011] Preferably, as an implementable solution; the gasket body is an elastically deformable polymer non-metallic material structural member.

[0012] Preferably, as an implementable solution; the gasket body is an HDPE or EVA plastic structural member.

[0013] Preferably, as an implementable solution; the angle between the downwardly extending top surface of the support piece portion and the horizontal plane is the support corner R; the value range of the support corner R is between 20 degrees and 45 degrees.

[0014] Preferably, as an implementable solution; the support corner R is 23 degrees.

[0015] Preferably, as an implementable solution; an annular filling sleeve layer is provided between the bottom of the support piece portion and the outer edge side wall of the circular groove portion.

[0016] Preferably, as an implementable solution; the longitudinal section of the annular filling sleeve layer is triangular in shape.

[0017] Preferably, as an implementable solution; reinforcing rib portions are provided at the bottom surface of the support piece portion along the radial direction starting from multiple position nodes at the outer edge of the circular groove portion.

[0018] Preferably, as an implementable solution; the overall height of the gasket body is 5.3 mm; the overall outer diameter dimension of the gasket body is 50 mm;

[0019] The inner concave depth of the circular groove portion is 3 mm, the inner diameter of the circular groove portion is 20 mm, the outer diameter of the circular groove portion is 23 mm, and the thickness of the bottom of the circular groove portion is 1.5 mm; the thickness of the support piece portion is 1.5 mm.

[0020] The technical effects of the special flat-bottom gasket for the mined tunnel node provided by the present utility model are as follows:

[0021] Analyzing the above-mentioned special flat-bottom gasket for the mined tunnel node provided by the embodiments of the present utility model, it can be seen that: the special flat-bottom gasket for the mined tunnel node includes: a gasket body having a circular cross-sectional shape, and a circular groove portion provided at the center of the gasket body and surrounding its center;

[0022] Wherein, a threaded positioning hole is provided at the center of the circular groove portion on the top surface of the gasket body, and an annular support piece portion extending radially is provided on the top surface of the gasket body and surrounding the outer edge of the circular groove portion;

[0023] The top surface of the support piece part is an inclined surface extending downward from the outer edge of the circular groove part, and the bottom surface of the end of the support piece part is a plane; and the bottom surface of the end of the support piece part is coplanar with the bottom surface of the circular groove part.

[0024] In the technical solution of this application, analyzing the above technical solution shows that: the special flat-bottom gasket for the mined tunnel node provided by the utility model patent has a gasket body with a circular cross-sectional shape as a whole. This design provides a uniform pressure distribution and reduces the local pressure on the geotextile composite sheet.

[0025] At the same time, a downwardly sunken circular groove part is adopted at the center, which is located at the center of the gasket body and is arranged around its center. After installing the bolt, the flat head of the bolt can be hidden inside the groove part, avoiding the phenomenon of convex bulge. Therefore, it can be said that the circular groove part helps to reduce the installation height of the gasket bolt and provides a space for accommodating bolts or other fixing elements.

[0026] The annular support piece part is located on the top surface of the gasket body, surrounds the outer edge of the circular groove part, and extends radially. The top surface of the support piece part itself is an inclined surface extending downward from the outer edge of the circular groove part, and the bottom surface of the end of the support piece part 13 is a plane; and the bottom surface of the end of the support piece part 13 is coplanar with the bottom surface of the circular groove part 11. In this way, after the overall gasket body is compressed under the action of the bolt, the support piece part deforms downward, which can disperse the pressure of the gasket on the geotextile, reduce the generation of indentation, and will cause the bottom plane to be in close contact with the geotextile composite sheet after being pressed, without causing obvious indentation; especially, after the support piece part 13 moves slightly downward, the height of the connection with the geotextile composite sheet itself will decrease, thereby ensuring the flatness of the plane at the connection of the geotextile composite sheet, and further providing a good working surface for the subsequent spraying construction of the coating.

[0027] Therefore, it can be said that in this embodiment, the bottom surface of the end of the support piece part is a plane and is coplanar with the bottom surface of the circular groove part. This design ensures the flatness when the gasket contacts the geotextile, avoids the convex bulge caused by unevenness, and thus ensures the flatness of the plane for the subsequent spraying of waterproof coating, improving the waterproof effect of the waterproof coating.

[0028] To sum up, the flat-bottom gasket of the utility model patent can effectively reduce the pressure on the geotextile composite sheet, avoid the convex bulge that affects the waterproof effect, and thus improve the waterproof performance and structural stability of the mined tunnel node. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of a traditional gasket in the prior art;

[0030] Figure 2Schematic diagram of the three-dimensional structure of the special flat-bottom gasket for the mined tunnel node in the embodiment of the present utility model from the bottom view perspective;

[0031] Figure 3 Schematic diagram of the three-dimensional structure of the special flat-bottom gasket for the mined tunnel node in the embodiment of the present utility model from the top view perspective;

[0032] Figure 4 Cross-sectional structure schematic diagram of the special flat-bottom gasket for the mined tunnel node in the embodiment of the present utility model;

[0033] Figure 5 Cross-sectional structure schematic diagram of the special flat-bottom gasket for the mined tunnel node in the embodiment of the present utility model with an annular filling sleeve layer installed;

[0034] Figure 6 Cross-sectional structure schematic diagram of the special flat-bottom gasket for the mined tunnel node in the embodiment of the present utility model after installing the annular filling sleeve layer, metal gasket and bolts.

[0035] Reference numerals: gasket body 10; circular groove portion 11; threaded positioning hole 12; support piece portion 13; annular filling sleeve layer 14; reinforcing rib portion 15. Specific embodiments

[0036] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0037] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0038] To facilitate the understanding of the present application, the present application will be described more comprehensively below with reference to the relevant accompanying drawings.

[0039] Embodiment 1

[0040] See Figures 2 - 3 , the present utility model provides a special flat-bottom gasket for mined tunnel nodes, including: a gasket body 10 with a circular cross-section shape, and a circular groove portion 11 provided at the center of the gasket body and surrounding its center;

[0041] A threaded positioning hole 12 is provided at the center of the circular groove portion 11 on the top surface of the gasket body (the threaded positioning hole is located at the center of the circular groove portion on the top surface of the gasket body, and this design allows the gasket to be accurately docked with bolts or other fasteners, ensuring the accuracy and stability of installation). An annular support piece portion 13 extending radially is provided on the top surface of the gasket body and surrounding the outer edge of the circular groove portion 11;

[0042] The top surface of the support piece portion 13 is an inclined surface extending downward from the outer edge of the circular groove portion, and the bottom surface of the end of the support piece portion 13 is a flat surface; and the bottom surface of the end of the support piece portion 13 is coplanar with the bottom surface of the circular groove portion 11.

[0043] Analyzing the above technical solution, it can be seen that: the special flat-bottom gasket for the mined tunnel node provided by the utility model patent has a gasket body with a circular cross-sectional shape as a whole. This design provides a uniform pressure distribution and reduces the local pressure on the geotextile composite sheet.

[0044] At the same time, a downwardly concave circular groove portion is adopted at the center, which is located at the center of the gasket body and surrounds its center. In this way, after the bolt is installed, the flat head of the bolt can be hidden inside the groove portion, avoiding the formation of convex bumps. Therefore, the circular groove portion helps to reduce the installation height of the gasket bolt and provides a space for accommodating bolts or other fixing elements.

[0045] The annular support piece portion is located on the top surface of the gasket body, surrounds the outer edge of the circular groove portion, and extends radially. The top surface of the support piece portion itself is an inclined surface extending downward from the outer edge of the circular groove portion, and the bottom surface of the end of the support piece portion 13 is a flat surface; and the bottom surface of the end of the support piece portion 13 is coplanar with the bottom surface of the circular groove portion 11. In this way, when the overall gasket body is compressed under the action of the bolt, the support piece portion deforms downward to disperse the pressure of the gasket on the geotextile, reducing the generation of indentations, and will cause the bottom surface plane to be closely attached to the geotextile composite sheet after being compressed, without causing obvious indentations; in particular, after the support piece portion 13 moves slightly downward, the height of the connection with the geotextile composite sheet itself decreases, thereby ensuring the flatness of the plane at the connection of the geotextile composite sheet, and further providing a good working surface for the subsequent spraying construction of the coating.

[0046] Therefore, it can be said that in this embodiment, the bottom surface of the end of the support piece portion is a flat surface and is coplanar with the bottom surface of the circular groove portion. This design ensures the flatness when the gasket contacts the geotextile, avoids the convex bumps caused by unevenness, thereby ensuring the flatness of the plane for the subsequent spraying of the waterproof coating and improving the waterproof effect of the waterproof coating.

[0047] In summary, the flat gasket of the utility model patent can effectively reduce the pressure on the geotextile composite sheet, avoid the generation of convex hulls that affect the waterproof effect, thereby improving the waterproof performance and structural stability of the mined tunnel node.

[0048] Preferably, as an implementable solution; the gasket body 10 is a polymer non-metallic material structural member with elastic deformability.

[0049] In the specific technical solution, preferably using a polymer non-metallic material structural member with elastic deformability can enhance the surface flatness after the overall connection between the gasket and the sheet.

[0050] Preferably, as an implementable solution; the gasket body 10 is an HDPE or EVA plastic structural member.

[0051] The above gasket body 10 can preferably be an HDPE or EVA plastic structural member. High-density polyethylene (HDPE) is a common plastic material. The hardness of HDPE usually ranges between 55 and 70 in the D-scale Rockwell hardness test. The mechanical strengths such as the surface hardness, tensile strength, and rigidity of HDPE are higher than those of low-density polyethylene (LDPE) and are close to those of polypropylene (PP). In addition, HDPE also has good heat resistance and cold resistance, good chemical stability, and good dielectric properties and environmental stress cracking resistance.

[0052] Ethylene-vinyl acetate copolymer (EVA) has a certain elasticity. The hardness of EVA usually ranges between 45 and 65 degrees. The finished products made of EVA have the characteristics of good softness, shock resistance, anti-slip, and strong pressure resistance.

[0053] In summary, both HDPE and EVA are plastic materials with wide applications. They have moderate hardness and a certain elastic deformation space. Among them, HDPE is suitable for structures that require stronger strength due to its higher hardness and mechanical strength.

[0054] Preferably, as an implementable solution; the included angle between the downward-extending top surface of the support sheet part 13 and the horizontal plane is the support horn R; the value range of the support horn R is between 20 degrees and 45 degrees.

[0055] Preferably, as an implementable solution; the support horn R is 23 degrees.

[0056] Such as Figure 5 and Figure 6As shown, in one specific embodiment 1; an annular filling sleeve layer 14 is provided between the bottom of the support piece portion 13 and the outer edge side wall of the circular groove portion. The longitudinal section of the annular filling sleeve layer 14 is triangular in shape. The annular filling sleeve layer 14 with a triangular longitudinal section can just be sleeved on the outer edge side wall of the circular groove portion, so as to fill the space formed by the included angle between the circular groove portion at the bottom surface and the support piece portion 13, and play an auxiliary role in externally supporting the circular groove portion, so as to better make the gasket body 10 fit the surface of the geotextile composite sheet, thereby reducing the surface damage to the geotextile composite sheet.

[0057] As Figure 4 shown, in another specific embodiment 2; reinforcing rib portions 15 are provided at the bottom surface of the support piece portion 13 and are arranged radially starting from multiple position nodes at the outer edge of the circular groove portion. Similarly, although the reinforcing rib portions 15 cannot achieve the technical effect of filling the space formed by the included angle between the circular groove portion at the bottom surface and the support piece portion 13, they can support the outside of the circular groove portion and prevent the support piece portion 13 from deforming too much.

[0058] Explanation: The structures in the above-mentioned embodiment 1 and embodiment 2 cannot coexist. Generally, if the annular filling sleeve layer 14 is installed, the reinforcing rib portions 15 are no longer installed. Similarly, if the reinforcing rib portions 15 are installed, there is no need to sleeve the annular filling sleeve layer 14 on the outer edge side wall of the circular groove portion.

[0059] Figure 5 It is a cross-sectional structure schematic diagram of the special flat-bottom gasket for the mined tunnel node of the embodiment of the present utility model with an annular filling sleeve installed; Figure 6 It is a cross-sectional structure schematic diagram of the special flat-bottom gasket for the mined tunnel node of the embodiment of the present utility model after installing the annular filling sleeve, metal gasket and bolt. During the Figures 5 to 6 installation process, due to the bolt squeezing the metal gasket, and then the metal gasket is forced to squeeze downward in the circular groove portion 11, it will have a lateral pressure outward (at this time, it can also be required that the outer diameter of the metal gasket is in interference fit with the inner diameter of the circular groove portion 11), and then expand and deform outward. At this time, the support piece portion 13 will also be pressed downward and undergo a certain rotational deformation, so that one side surface of the annular filling sleeve layer 14 better fits the bottom surface, forming a better fitting effect.

[0060] Preferably, as an implementable solution; the overall height of the gasket body is 5.3 mm; the overall outer edge diameter dimension of the gasket body is 50 mm;

[0061] The inner concave depth of the circular groove portion is 3 mm, the inner diameter of the circular groove portion is 20 mm, the outer diameter of the circular groove portion is 23 mm, and the bottom thickness of the circular groove portion is 1.5 mm; the thickness of the support piece portion is 1.5 mm.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; those of ordinary skill in the art can modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A special flat gasket for the node of an excavated tunnel, characterized in that, Comprising: A gasket body with a circular cross-sectional shape, and a circular groove portion provided at the center of the gasket body and surrounding its center; A threaded positioning hole is provided at the center of the circular groove portion on the top surface of the gasket body, and an annular support piece portion extending radially is provided on the top surface of the gasket body and surrounding the outer edge of the circular groove portion; The top surface of the support piece portion is an inclined surface extending downward from the outer edge of the circular groove portion, and the bottom surface of the end of the support piece portion is a flat surface; and the bottom surface of the end of the support piece portion is coplanar with the bottom surface of the circular groove portion.

2. The special flat gasket for the node of the mined tunnel according to claim 1, characterized in that The gasket body is an elastically deformable polymer non-metallic material structural member.

3. The special flat gasket for the node of the mined tunnel according to claim 2, characterized in that, The gasket body is an HDPE or EVA plastic structural member.

4. The special flat gasket for the node of the mined tunnel according to claim 1, characterized in that The included angle between the downward-extending top surface of the support piece portion and the horizontal plane is the support horn R; the value range of the support horn R is between 20 degrees and 45 degrees.

5. The special flat gasket for the node of the mined tunnel according to claim 4, characterized in that, The support horn R is 23 degrees.

6. The special flat gasket for the node of the mined tunnel according to claim 5, characterized in that, An annular filling sleeve layer is provided between the bottom of the support piece portion and the outer side wall of the outer edge of the circular groove portion.

7. The special flat gasket for the node of the mined tunnel according to claim 6, characterized in that, The longitudinal section of the annular filling sleeve layer is triangular in shape.

8. A special flat gasket for the node of a mined tunnel according to claim 5, characterized in that Reinforcing rib portions are provided at the bottom surface of the support piece portion and extending radially from multiple position nodes at the outer edge of the circular groove portion.

9. The special flat gasket for the mined tunnel node according to claim 1, wherein, The overall height of the gasket body is 5.3 mm; the overall outer diameter dimension of the gasket body is 50 mm; The inner concave depth of the circular groove portion is 3 mm, the inner diameter of the circular groove portion is 20 mm, the outer diameter of the circular groove portion is 23 mm, and the thickness of the bottom of the circular groove portion is 1.5 mm; the thickness of the support piece portion is 1.5 mm.

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