CN208057130U - A kind of duct pieces of shield tunnel seam waterproof elastic sealing gasket - Google Patents
A kind of duct pieces of shield tunnel seam waterproof elastic sealing gasket Download PDFInfo
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- CN208057130U CN208057130U CN201820076444.7U CN201820076444U CN208057130U CN 208057130 U CN208057130 U CN 208057130U CN 201820076444 U CN201820076444 U CN 201820076444U CN 208057130 U CN208057130 U CN 208057130U
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- waterproof
- sealing gasket
- elastic sealing
- arc
- shield tunnel
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- 238000007789 sealing Methods 0.000 title claims abstract description 49
- 229920002943 EPDM rubber Polymers 0.000 claims abstract description 28
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 22
- 239000010703 silicon Substances 0.000 claims abstract description 22
- 239000006260 foam Substances 0.000 claims abstract description 18
- 230000007774 longterm Effects 0.000 abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 10
- 230000006835 compression Effects 0.000 abstract description 7
- 238000007906 compression Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 6
- 229920001971 elastomer Polymers 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 abstract description 5
- 238000011084 recovery Methods 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 3
- 230000035882 stress Effects 0.000 abstract 3
- 230000037326 chronic stress Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- 239000006261 foam material Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000005187 foaming Methods 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 239000002861 polymer material Substances 0.000 description 2
- 229920002379 silicone rubber Polymers 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000009440 infrastructure construction Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
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- Gasket Seals (AREA)
Abstract
The utility model discloses a kind of duct pieces of shield tunnel seam waterproof elastic sealing gasket, it is characterised in that：The water-proof elastic gasket includes silicon foam inner core, and the ethylene propylene diene rubber cover tire being wrapped in outside silicon foam inner core.When use, two panels elastic sealing gasket mirror symmetry is pasted on respectively in the waterproof caulking groove of two adjacent sections of jurisdiction, and crush seal pad after the splicing of section of jurisdiction makes silicon foam inner core that compression occur, generate contact stress, to make ethylene propylene diene rubber be bonded to each other, squeeze, waterproof sealing effect is played.Compared with the common one-component EPDM through-hole rubber gasket of existing field of engineering technology, add silicon foam inner core waterproof sealing gasket have contact stress uniformly, fitting is close and the advantages such as long duration load holding capacity and stronger elastic recovery capability, the stress relaxation phenomenon under waterproof sealing gasket chronic stress can be effectively reduced, there is important value for the long-term water resistance of shield tunnel.
Description
Technical Field
The utility model belongs to shield tunnel engineering field especially relates to a shield tunnel section of jurisdiction seam waterproof elastic sealing pad.
Background
In recent years, with the rapid development of social economy and urbanization processes, the shield tunnel technology has become an indispensable key technology in infrastructure construction of important traffic and the like in China. Due to the characteristics of the lining structure of the shield tunnel by block splicing, the waterproof of the segment joints is of great importance to the normal use and the safety of the surrounding environment of the tunnel.
In the technical field of engineering at present, the waterproof of the segment joint mostly adopts a single-component ethylene propylene diene monomer (internally opened through hole) sealing gasket or an ethylene propylene diene monomer (internally opened through hole) sealing gasket of which the top is lapped with water-swelling rubber. The waterproof mechanism can be described as follows: the ethylene propylene diene monomer rubber is an incompressible elastic material, a plurality of through holes arranged inside the segments are compressed and collapsed when the segments are spliced, and contact stress is generated by the resilience of the ethylene propylene diene monomer rubber to resist water pressure, so that a waterproof effect is achieved.
Such gaskets have the disadvantages that:
1. the contact stress is not uniform.
2. The local part is not tightly attached, and the tilting is easy to happen.
3. Stress concentration occurs at the internal opening, which is easy to cause tearing damage of the ethylene propylene diene monomer.
4. The sealing gasket is easy to generate stress relaxation phenomenon under the action of long-term compression stress, and the rubber has insufficient recovery deformability after hole collapse, so that the waterproof capability of the sealing gasket is reduced.
Therefore, how to overcome the above disadvantages of the conventional gasket and ensure the short-term and long-term waterproof performance of the shield tunnel is very important in the field of shield tunnel waterproofing.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a shield tunnel section of jurisdiction seam waterproof elastic sealing pad, this elastic sealing pad are under the section of jurisdiction pressure effect in both sides, and contact stress is even, and the laminating is inseparable, does not produce stress concentration, has advantages such as long-term load retention ability and stronger elastic recovery ability, can effectively reduce the stress relaxation phenomenon under the waterproof sealing pad long-term pressure.
In order to achieve the above purpose, the technical scheme of the utility model is as follows: the utility model provides a shield tunnel section of jurisdiction seam waterproof elastic sealing pad which characterized in that: the waterproof elastic sealing gasket comprises a silicon foam inner core and an ethylene propylene diene monomer outer tire wrapped outside the silicon foam inner core.
Further, paste two elastic sealing pad mirror symmetry respectively in the waterproof caulking groove of two adjacent sections of jurisdiction, the section of jurisdiction concatenation back extrusion sealed pad makes the silicon foam inner core takes place the compression, produces contact stress, thereby makes ethylene propylene diene monomer cover tire laminates each other, extrudees, plays waterproof sealing effect.
Further, the thickness of the ethylene propylene diene monomer outer tire is 3-6 mm.
Further, the silicon foam inner core is made of a silicon foam porous super-elastic rubber material, and the density of the silicon foam inner core is 0.45-0.55 g/cm3The porosity is 40% -90%, and the long-term compression stress relaxation rate is less than 20%.
Furthermore, the top surface of the ethylene propylene diene monomer outer tire is closed or provided with an opening, so that the ethylene propylene diene monomer outer tire meets different requirements on water resistance and assembling precision.
Further, the ethylene propylene diene monomer cover tire comprises a bottom surface and a top surface which are arranged in parallel, one side of the bottom surface is connected with one side of the top surface through a first arc-shaped side surface and a first inclined side surface, the other side of the bottom surface is connected with the other side of the top surface through a second arc-shaped side surface and a second inclined side surface, the first arc-shaped side surface, the first inclined side surface, the second arc-shaped side surface and the second inclined side surface are symmetrically arranged, the first arc-shaped side surface and the second arc-shaped side surface are both concave arcs, the bottom surface is slightly narrower than the width of the top surface, an included angle of 120-150 degrees is formed between the first arc-shaped side surface and the first inclined side surface, an included angle of 120-130 degrees is formed between the first inclined side surface and the top surface.
The elastic sealing gasket is arranged in a waterproof caulking groove of a shield tunnel duct piece, a certain gap is reserved between a first oblique side face and a second oblique side face of the elastic sealing gasket and the side face of the waterproof caulking groove under the non-pressed state, the intersection point of the arc side face and the oblique side face is lower than 1-3 mm of the surface of the waterproof groove, and 80% -95% of the arc side face is exposed out of the waterproof caulking groove.
It should be noted that the silicon foam material is a tough porous (microporous) super-elastic polymer material, and is made of silicon rubber through a special foaming process. Due to the structural particularity of the silicon foam, the silicon foam keeps the excellent performance of the silicon rubber, and has the characteristics of light weight, sealing, high compression, high resilience and the like, so that the silicon foam is widely applied to the fields of automobiles, high-precision instruments and weaponry, but is not applied to the field of shield tunnels at present.
Compared with the prior art, the utility model have following advantage:
1. the contact stress is uniform, the joint is tight, the stress concentration is not generated, and the integrity of the waterproof rubber is ensured. The silicon foam material is a tough porous (microporous) hyperelastic high polymer material generated by a foaming process, and has good uniformity and compression resilience, so that uniform contact stress can be generated after being pressed, local warping and stress concentration are avoided, the silicon foam material is tightly attached to a duct piece, and the silicon foam material has good waterproof performance.
2. The waterproof sealing gasket has the advantages of long-term load retention capacity, strong elastic recovery capacity and the like, and can effectively reduce the stress relaxation phenomenon of the waterproof sealing gasket under long-term pressure.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of another embodiment of the present invention.
Fig. 3 is a schematic structural diagram of another embodiment of the present invention.
Fig. 4 is the schematic diagram of the utility model before the sealing gasket is compressed when the duct piece is used in a splicing way.
Fig. 5 is the schematic diagram of the utility model after the sealing gasket is compressed when the duct piece is used in a splicing way.
Detailed Description
The invention is further described below with reference to the accompanying drawings and examples:
as shown in the figure, the waterproof elastic sealing gasket 1 for the shield tunnel segment joint consists of an ethylene propylene diene monomer outer tire 2 and a silicon foam inner core 3.
As shown in the figures, according to the utility model discloses a preferred embodiment, ethylene propylene diene monomer cover tire 2 includes parallel arrangement's bottom surface and top surface, one side of bottom surface is connected with one side of top surface through first oblique side and first arc side, the opposite side of bottom surface is connected with the opposite side of top surface through second oblique side and second arc side, wherein first arc side, first oblique side and second arc side, second oblique side symmetry sets up, first arc side and second arc side are the indent arc, the top surface is narrower than the bottom surface width slightly, form 120~150 degrees contained angle between first arc side and the first oblique side, form 120~130 degrees contained angle between first oblique side and the bottom surface, the appearance of silicon foam inner core 3 cooperatees with the inner chamber that ethylene propylene diene monomer cover tire 2 formed. The shape of the waterproof sealing gasket adopts the transition of an inward concave arc-shaped matching inclined plane, so that the edge of the sealing gasket generates compressive stress and does not generate tensile stress when being extruded by the pipe piece, and the durability is better under the action of underground water.
FIG. 1 showsWaterproof elastic sealing gasket of type (ethylene propylene diene monomer closed full-wrapping type). That is, the epdm rubber cover 2 is a closed cover. FIG. 2Shown asWaterproof elastic sealing gasket of type (ethylene propylene diene monomer C type opening full-wrapping type). That is, the bottom surface of the EPDM outer tire 2 is provided with an opening, the opening is generally 1-3 mm, and FIG. 3 showsA waterproof elastic sealing gasket of type (ethylene propylene diene monomer C type opening half-wrapping type). Namely, the bottom surface of the ethylene propylene diene monomer outer tire 2 is provided with an opening, and the opening is generally 5-20 mm. Wherein,the waterproof sealing gasket is suitable for the conditions of high waterproof requirement of a tunnel, abundant underground water, high water pressure, poorer duct piece assembling condition and lower assembling precision;the waterproof sealing gasket is suitable for the conditions that the tunnel has higher waterproof requirement, more underground water and higher water pressure, or the pipe piece assembly condition is better and the assembly precision is better;the waterproof sealing gasket is suitable for the conditions of low waterproof requirement of a tunnel, less underground water, low water pressure, good segment assembling condition and high assembling precision.
The section of jurisdiction 4 is equipped with waterproof caulking groove 5, and this 5 cross-sections of waterproof caulking grooves are trapezoidal shape, and the bottom surface of the sealed 2 EPT rubber cover tire of mat elastic sealing sets up inwards in waterproof caulking groove, and leaves certain space between its oblique side and the waterproof caulking groove side, and the arc side is less than 1~3mm on waterproof groove surface with the nodical point of oblique side, and 80% ~95% of arc side expose outside waterproof caulking groove 5. During the use, will two elastic sealing pad 1 mirror symmetry pastes respectively in the waterproof caulking groove 5 of two adjacent sections of jurisdiction 4, extrude behind the section of jurisdiction 4 concatenation sealed pad 1 makes silicon foam inner core 3 takes place the compression, produces contact stress, thereby makes ethylene propylene diene monomer cover tire 2 laminates each other, extrudees, plays waterproof sealing effect.
Adopt the utility model discloses a shield tunnel section of jurisdiction seam waterproof elastic sealing pad can produce even contact stress after the pressurized, does not take place local warpage and stress concentration, and is inseparable with the section of jurisdiction laminating, has better waterproof performance. Under the long-term compressive stress effect, the waterproof sealing gasket has the advantages of load holding capacity, strong elastic recovery capacity and the like, can effectively reduce the stress relaxation phenomenon of the waterproof sealing gasket under the long-term pressure, and can fully ensure that the waterproof durability of the segment joint meets the tunnel operation requirement.
While the present invention has been described in detail with reference to the preferred embodiments thereof, it should be understood that the above description should not be taken as limiting the present invention. Numerous modifications and alterations to the present invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be limited only by the attached claims.
Claims (5)
1. The utility model provides a shield tunnel section of jurisdiction seam waterproof elastic sealing pad which characterized in that: the waterproof elastic sealing gasket comprises a silicon foam inner core and an ethylene propylene diene monomer outer tire wrapped outside the silicon foam inner core.
2. The waterproof elastic sealing gasket for the joints of the shield tunnel segments as claimed in claim 1, wherein: the thickness of the ethylene propylene diene monomer outer tire is 3-6 mm.
3. The waterproof elastic sealing gasket for the joints of the shield tunnel segments as claimed in claim 1, wherein: the ethylene propylene diene monomer rubber cover tire comprises a bottom surface and a top surface which are arranged in parallel, one side of the bottom surface is connected with one side of the top surface through a first arc-shaped side surface and a first oblique side surface, the other side of the bottom surface is connected with the other side of the top surface through a second arc-shaped side surface and a second oblique side surface, the first arc-shaped side surface, the first oblique side surface and the second arc-shaped side surface are symmetrically arranged, the first arc-shaped side surface and the second arc-shaped side surface are both concave arcs, the bottom surface is slightly narrower than the width of the top surface, an included angle of 120-150 degrees is formed between the first arc-shaped side surface and the first oblique side surface, an included angle of 120-130 degrees is formed between the first oblique side surface and the top surface, and the appearance.
4. The waterproof elastic sealing gasket for the joints of the shield tunnel segments as claimed in claim 3, wherein: the top surface of the ethylene propylene diene monomer outer tire is closed or provided with an opening.
5. The waterproof elastic sealing gasket for the joints of the shield tunnel segments as claimed in claim 4, wherein: the elastic sealing gasket is arranged in a waterproof caulking groove of a shield tunnel duct piece, a certain gap is reserved between a first oblique side face and a second oblique side face of the elastic sealing gasket and the side face of the waterproof caulking groove under the non-pressed state, the intersection point of the arc side face and the oblique side face is lower than 1-3 mm of the surface of the waterproof groove, and 80% -95% of the arc side face is exposed out of the waterproof caulking groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820076444.7U CN208057130U (en) | 2018-01-17 | 2018-01-17 | A kind of duct pieces of shield tunnel seam waterproof elastic sealing gasket |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820076444.7U CN208057130U (en) | 2018-01-17 | 2018-01-17 | A kind of duct pieces of shield tunnel seam waterproof elastic sealing gasket |
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| CN208057130U true CN208057130U (en) | 2018-11-06 |
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| CN201820076444.7U Active CN208057130U (en) | 2018-01-17 | 2018-01-17 | A kind of duct pieces of shield tunnel seam waterproof elastic sealing gasket |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108252728A (en) * | 2018-01-17 | 2018-07-06 | 上海市政工程设计研究总院（集团）有限公司 | A kind of duct pieces of shield tunnel seam waterproof elastic sealing gasket |
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2018
- 2018-01-17 CN CN201820076444.7U patent/CN208057130U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108252728A (en) * | 2018-01-17 | 2018-07-06 | 上海市政工程设计研究总院（集团）有限公司 | A kind of duct pieces of shield tunnel seam waterproof elastic sealing gasket |
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