CN104964768A - Shield tunnel elastic seal gasket contact stress test system and method - Google Patents
Shield tunnel elastic seal gasket contact stress test system and method Download PDFInfo
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- CN104964768A CN104964768A CN201510340318.9A CN201510340318A CN104964768A CN 104964768 A CN104964768 A CN 104964768A CN 201510340318 A CN201510340318 A CN 201510340318A CN 104964768 A CN104964768 A CN 104964768A
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Abstract
Provided is a shield tunnel elastic seal gasket contact stress test device which comprises a groove upper module, a groove lower module, a guide sleeve which guides the installation of the groove upper module and the groove lower module, end surface seal plates, elastic seal gaskets and a thin film pressure sensor. The elastic seal gaskets are arranged between the groove upper module and the groove lower module; the end surface seal plates are arranged at the two ends of the groove upper module and the two ends of the groove lower module respectively; the thin film pressure sensor is transversely arranged between the elastic seal gaskets; the two ends of each elastic seal gasket are sealed; and the thin film pressure sensor is connected with a data acquisition and processing unit for obtaining contact stress between the upper and lower two elastic seal gaskets. The invention also discloses a method for carrying out shield tunnel elastic seal gasket contact stress test by utilizing the device above. The device and method can effectively reflect the contact stress of the elastic seal gaskets in the assembly process; and, besides, the factor of airbag effect caused by air sealed in the seal gasket seal holes is taken into consideration, so that the obtained result is more accurate and reliable.
Description
Technical field
The invention belongs to tunnels and underground engineering field, relate to a kind of elastic sealing gasket of shield tunnel contact stress method of testing.
Background technology
In current tunnels and underground engineering field, when carrying out tunnel duct piece assembled, owing to considering waterproof requirement, between the groove of two segment assemblies, be placed with elastic sealing gasket.Elastic sealing gasket should meet pipe sheet assembling requirement, namely section of jurisdiction sealing gasket should be able to be compressed to seam completely closed (joint open=0mm) by duct piece assembling machine completely, and under the acting force of jack thrust and pipe sheet assembling, the disadvantage such as section of jurisdiction end face and bight damage should not be caused to occur.Therefore, require that we have certain understanding to the size of the contact stress between elastic sealing gasket, and simulate the Compressive Mechanical behavior of shield structure elastic sealing gasket in assembled process, prevent because closed force of compression is excessive and affect the normally assembled of section of jurisdiction.
In elastic sealing gasket compression test in the past, between two elastic sealing gaskets, do not place diaphragm pressure sensor, the size of section of jurisdiction elastic sealing gasket Contact stress when assembled can not be reflected.In fact, when carrying out elastic sealing gasket compression test, along with on groove top board, applied pressure increases gradually, contact stress between upper and lower two elastic sealing gaskets also increases gradually, elastic sealing gasket closes gradually, because sealing gasket fixture in the end can contact with each other compression stage local, cause force of compression sharply to increase, therefore how to evaluate and obtain closed compression force data thus and just become very difficult.
In addition, elastic sealing gasket used in compression test is in the past the unsealed elastic sealing gaskets in two ends, does not have " air bag effect " impact on compression test considering that the air be enclosed in sealing gasket cap holes causes.Research shows the existence due to gaseous tension in cavity, and the hole wall Instability of sealing gasket is obviously delayed, and closed force of compression index improves more than 10%, and " air bag effect " can not be ignored.
Summary of the invention
The object of the present invention is to provide a kind of elastic sealing gasket of shield tunnel contact stress test system and method, " the air bag effect " of elastic sealing gasket can well be considered and the contact stress between effective elasticity of response sealing gasket.
For achieving the above object, solution of the present invention is: a kind of elastic sealing gasket of shield tunnel contact stress tester for testing, comprise the upper and lower module of groove, guide the orienting sleeve that the upper and lower module of described groove is installed, end face shrouding, elastic sealing gasket and diaphragm pressure sensor, described elastic sealing gasket is positioned between the upper and lower module of described groove, described end face shrouding is arranged at the two ends of the upper and lower module of described groove, described diaphragm pressure sensor is placed horizontally between described elastic sealing gasket, the sealing of described elastic sealing gasket two ends, described diaphragm pressure sensor is connected with data acquisition and treating apparatus to obtain the contact stress between upper and lower two elastic sealing gaskets.
Further, described orienting sleeve is a channel-shaped structure, the size of groove and groove lower module and groove upper module outer peripheral measure-alike so that by relative with groove upper module for the groove lower module groove putting into orienting sleeve, the installation of guiding groove lower module and groove upper module.
The upper and lower module of described groove is used for simulating section of jurisdiction to be assembled in shield tunnel, and the groove dimensions of the upper and lower module of described groove is consistent with needing the design groove dimensions of the duct pieces of shield tunnel of simulating.
The length of described groove is 20cm.
The length of described elastic sealing gasket is 200mm, and length tolerance is-1mm.
The Applicable temperature Wei of described diaphragm pressure sensor, data acquisition and treating apparatus ?9 DEG C ~ 204 DEG C.
The two ends of the upper and lower module of described groove adopt end face shrouding to carry out shutoff, and described end face shrouding is undertaken being connected and playing plugging action by bolt and module.
A kind of method using above-mentioned device to carry out elastic sealing gasket of shield tunnel contact stress testing experiment: adopt compression test device to carry out compression test to elastic sealing gasket sample; Adopt the elastic sealing gasket of two ends sealing, to consider " air bag effect " impact on compression test that the air be enclosed in sealing gasket cap holes causes; Medium position between elastic sealing gasket laterally places diaphragm pressure sensor; Progressively pressure is applied by compressive force apparatus at groove upper module top; Diaphragm pressure sensor is connected with data acquisition and treating apparatus, can record the contact stress between upper and lower two elastic sealing gaskets.
Further, the section configuration size of described elastic sealing gasket sample should with the section configuration consistent size designed, and the length of sample is 200mm, and length tolerance is-1mm; Sample should be parked and be not less than 16 hours under standard temperature, and no longer than 3 months, test should be carried out under standard temperature.
By bolt, groove lower module is connected with end face shrouding with the two ends of groove upper module, reaches plugging action; Top pressure is applied by compressive force apparatus at groove upper module top.
Pressure puts on elastic sealing gasket by groove upper module top step by step, equably, with 50mm/min speed compression sample, until compression clearance is close to 0mm, then loosens sample with identical speed, Repeated Compression like this and loosen sample repeat secondary; The device of test sealing gasket vertical displacement configures voluntarily by detecting department, and the precision of decrement measuring appliance is not less than 0.02mm.
Third time is official test, and combination film pressure transducer, draws the stress-strain diagram of elastic sealing gasket test block.
Owing to adopting technique scheme, the present invention has following beneficial effect:
1) " air bag effect " impact for sealing gasket compression test, is considered;
2), adopt diaphragm pressure sensor, effectively reflect the contact stress between elastic sealing gasket of shield tunnel;
3), the rule of development of elastic sealing gasket of shield tunnel Contact stress can be sought further, determine reasonably to close force of compression;
4), the groove dimensions of groove module should be consistent with the design groove dimensions of duct pieces of shield tunnel, and the elastic sealing gasket section configuration size of employing and the section configuration consistent size of design, ensure that authenticity and the reliability of test findings.
Accompanying drawing explanation
Fig. 1 is embodiment of the present invention elastic sealing gasket compression test device cross sectional representation.
Fig. 2 is embodiment of the present invention elastic sealing gasket compression test device longitudinal profile schematic diagram (after removing orienting sleeve).
Fig. 3 is the upper and lower module of embodiment of the present invention groove, elastic sealing gasket and the assembled schematic diagram of termination shrouding.
Fig. 4 is surface of contact compressive stress and the force of compression trial curve figure of Sample A.
Fig. 5 is surface of contact compressive stress and the force of compression trial curve figure of sample B.
Label in Fig. 1-3: 1-orienting sleeve; 2-groove lower module; 3-rubber gasket; 4-groove upper module; 5-end face shrouding; 6-diaphragm pressure sensor.
Embodiment
Below in conjunction with accompanying drawing illustrated embodiment, feature of the present invention and other correlated characteristic are described in further detail.
See Fig. 1-3, a kind of elastic sealing gasket of shield tunnel contact stress test system, comprises an orienting sleeve 1, groove upper module 4, groove lower module 2, the end face shrouding 5 at module two ends, the diaphragm pressure sensor 6 that is positioned over the elastic sealing gasket 3 between the upper and lower module of groove and is placed horizontally between elastic sealing gasket 3.
An orienting sleeve 1 is comprised in test unit, orienting sleeve 1 is a channel-shaped structure, the size of groove and groove lower module 2 and groove upper module 4 outer peripheral measure-alike, so that by relative with groove upper module 4 for groove lower module 2 groove putting into orienting sleeve 1, the installation of guiding groove lower module 2 and groove upper module 4.Groove lower module 2 and groove upper module 4 are used for simulating section of jurisdiction to be assembled in shield tunnel, and the groove dimensions of groove module should be consistent with the design groove dimensions of duct pieces of shield tunnel, and the length of groove is 20cm.Groove upper module 4 top center can as the application point applying force of compression, and the device applying force of compression can be configured voluntarily by detection department.
Place an elastic sealing gasket 3 in the groove of groove lower module 2 and groove upper module 4 respectively, the elastic sealing gasket that described elastic sealing gasket 3 adopts two ends to seal, the length of elastic sealing gasket 3 is 200mm, and length tolerance is-1mm.Medium position between upper and lower two elastic sealing gaskets 3 laterally places a diaphragm pressure sensor 6, and diaphragm pressure sensor 6 is connected with data acquisition and treating apparatus.The two ends of groove lower module 2 and groove upper module 4 adopt end face shrouding 5 to carry out shutoff, and described end face shrouding 5 carries out being connected and reaching plugging action with groove lower module 2 and groove upper module 4 by bolt.
The method using said system to carry out testing is as follows:
The section configuration size of elastic sealing gasket 3 sample should with the section configuration consistent size designed, and the length of sample is 200mm, and length tolerance is-1mm.Sample should be parked and be not less than 16 hours under standard temperature, and no longer than 3 months, test should be carried out under standard temperature.
According to test design and test unit, the assembled of compression mould is carried out: after being placed by orienting sleeve 1 with reference to schematic diagram, place groove lower module 2 successively, then in the groove of groove lower module 2, elastic sealing gasket 3 is placed in alignment, on elastic sealing gasket 3, medium position laterally places diaphragm pressure sensor 6, afterwards, in the groove of groove upper module 4, elastic sealing gasket 3 is placed in alignment, the groove lower module 4 having installed elastic sealing gasket 3 is placed on groove lower module 2, after above-mentioned part installs, by bolt, groove lower module 2 is connected with end face shrouding 5 with the two ends of groove upper module 4, reach plugging action.Above-mentioned test mould is assembled complete after, apply top pressure at groove upper module 4 top by compressive force apparatus, the precision of compression stress measuring appliance is not less than 0.01kN.
Pressure puts on elastic sealing gasket by groove upper module 4 top step by step, equably.With 50mm/min speed compression sample, until compression clearance is close to 0mm, then loosen sample with identical speed, Repeated Compression like this and loosen sample repeat secondary.The device of test sealing gasket vertical displacement configures voluntarily by detecting department, and the precision of decrement measuring appliance is not less than 0.02mm.
Third time is official test, and combination film pressure transducer, draws the stress-strain diagram of elastic sealing gasket test block.
Before sealing gasket fixture groove lower module 2 does not contact with groove upper module 4, along with the increase gradually of groove upper module 4 top pressure, the contact stress between elastic sealing gasket 3 also increases gradually.
The pressure at groove upper module 4 top continues to increase, at the compression stage of elastic sealing gasket 3, elastic sealing gasket 3 is close to closed (joint open is 0mm), sealing gasket fixture and groove lower module 2 and groove upper module 4 local can contact with each other, and the phenomenon increased suddenly will occur the stress that now diaphragm pressure sensor 6 reflects on the stress level that it is original.
This stress mutation phenomenon can reflect groove lower module 2 and groove upper module 4 contacts with each other, elastic sealing gasket 3 is close to situation time closed.
Have chosen two Sample A and B carry out compression test and analyze as an example, test gathers the force of compression of lifting jack, records the compressive stress Changing Pattern between sealing gasket surface of contact simultaneously.Experimental test result respectively as shown in Figure 4, Figure 5.
As can be seen from Fig. 4-5, in the end sealing gasket was compressed close to the closed stage, and the growth of force of compression is very rapidly, and the compression stress development between surface of contact is very slowly, and its slope does not almost change.This illustrates in the end close stage, and the direct contact between fixture is inevitable, and its contribution for closed force of compression is very large.Therefore, as the closed force of compression weighing sealing gasket compression property index own, in prior art, its defining method must improve, and filters out the impact of fixture Contact.
Compared to existing similar test, the present invention mainly considers " air bag effect " for the impact of sealing gasket compression test, and combines and adopt diaphragm pressure sensor, effectively reflects the contact stress between elastic sealing gasket of shield tunnel.The rule of development of elastic sealing gasket of shield tunnel Contact stress can be sought according to above-mentioned test findings further, determine reasonably to close force of compression.
Above-mentioned is can understand and apply the invention for ease of those skilled in the art to the description of embodiment.Person skilled in the art obviously easily can make various amendment to these embodiments, and General Principle described herein is applied in other embodiments and need not through performing creative labour.Therefore, the invention is not restricted to embodiment here, those skilled in the art, according to announcement of the present invention, do not depart from improvement that scope makes and amendment all should within protection scope of the present invention.
Claims (9)
1. an elastic sealing gasket of shield tunnel contact stress tester for testing, it is characterized in that: comprise the upper and lower module of groove, guide the orienting sleeve that the upper and lower module of described groove is installed, end face shrouding, elastic sealing gasket and diaphragm pressure sensor, described elastic sealing gasket is positioned between the upper and lower module of described groove, described end face shrouding is arranged at the two ends of the upper and lower module of described groove, described diaphragm pressure sensor is placed horizontally between described elastic sealing gasket, the sealing of described elastic sealing gasket two ends, described diaphragm pressure sensor is connected with data acquisition and treating apparatus to obtain the contact stress between upper and lower two elastic sealing gaskets.
2. test unit as claimed in claim 1, it is characterized in that: described orienting sleeve is a channel-shaped structure, the size of groove and groove lower module and groove upper module outer peripheral measure-alike, so that by relative with groove upper module for the groove lower module groove putting into orienting sleeve, the installation of guiding groove lower module and groove upper module.
3. test unit as claimed in claim 1, is characterized in that: the upper and lower module of described groove is used for simulating section of jurisdiction to be assembled in shield tunnel, and the groove dimensions of the upper and lower module of described groove is consistent with needing the design groove dimensions of the duct pieces of shield tunnel of simulating.
4. test unit as claimed in claim 1, is characterized in that: the length of described groove is 20cm.
5. test unit as claimed in claim 1, is characterized in that: the length of described elastic sealing gasket is 200mm, and length tolerance is-1mm.
6. test unit as claimed in claim 1, is characterized in that: the Applicable temperature of described diaphragm pressure sensor, data acquisition and treating apparatus Wei ?9 DEG C ~ 204 DEG C.
7. test unit as claimed in claim 1, is characterized in that: the two ends of the upper and lower module of described groove adopt end face shrouding to carry out shutoff, and described end face shrouding is undertaken being connected and playing plugging action by bolt and module.
8. use arbitrary described device in claim 1 to 7 to carry out a method for elastic sealing gasket of shield tunnel contact stress testing experiment, it is characterized in that: adopt compression test device to carry out compression test to elastic sealing gasket sample; Adopt the elastic sealing gasket of two ends sealing, to consider " air bag effect " impact on compression test that the air be enclosed in sealing gasket cap holes causes; Medium position between elastic sealing gasket laterally places diaphragm pressure sensor; Progressively pressure is applied by compressive force apparatus at groove upper module top; Diaphragm pressure sensor is connected with data acquisition and treating apparatus, can record the contact stress between upper and lower two elastic sealing gaskets.
9. method as claimed in claim 8, is characterized in that:
The section configuration size of described elastic sealing gasket sample should with the section configuration consistent size designed, and the length of sample is 200mm, and length tolerance is-1mm; Sample should be parked and be not less than 16 hours under standard temperature, and no longer than 3 months, test should be carried out under standard temperature;
By bolt, groove lower module is connected with end face shrouding with the two ends of groove upper module, reaches plugging action; Top pressure is applied by compressive force apparatus at groove upper module top;
Pressure puts on elastic sealing gasket by groove upper module top step by step, equably, with 50mm/min speed compression sample, until compression clearance is close to 0mm, then loosens sample with identical speed, Repeated Compression like this and loosen sample repeat secondary; The device of test sealing gasket vertical displacement configures voluntarily by detecting department, and the precision of decrement measuring appliance is not less than 0.02mm;
Third time is official test, and combination film pressure transducer, draws the stress-strain diagram of elastic sealing gasket test block.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510340318.9A CN104964768A (en) | 2015-06-18 | 2015-06-18 | Shield tunnel elastic seal gasket contact stress test system and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510340318.9A CN104964768A (en) | 2015-06-18 | 2015-06-18 | Shield tunnel elastic seal gasket contact stress test system and method |
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| CN104964768A true CN104964768A (en) | 2015-10-07 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107907407A (en) * | 2017-09-27 | 2018-04-13 | 同济大学 | A kind of new rubber gasket compression stress performance testing device and method |
| CN109374865A (en) * | 2018-12-07 | 2019-02-22 | 华侨大学 | A kind of shield tunnel scaled model considering curved bolt clipping forcee and production method |
| CN109668580A (en) * | 2018-12-10 | 2019-04-23 | 上海交通大学 | Pressure-sensitive films, sensor, sensor array and respective preparation method |
| CN109709212A (en) * | 2019-02-26 | 2019-05-03 | 上海声望声学科技股份有限公司 | A kind of sealing strip sound insulation measurement auxiliary mould and test macro |
| CN109883678A (en) * | 2019-03-25 | 2019-06-14 | 宁波用躬科技有限公司 | Predict the experimental rig and its test method of water-swellable gasket service life |
| CN113021822A (en) * | 2021-03-26 | 2021-06-25 | 王天寿 | Three-dimensional net and double-screw extruder for producing same |
| CN113390628A (en) * | 2021-05-20 | 2021-09-14 | 东南大学 | Device and method for testing waterproof performance degradation under circulating load action of shield segment sealing gasket |
| CN114923677A (en) * | 2022-06-02 | 2022-08-19 | 中南大学 | Fatigue testing device and method for sealing piece of storage cabin gate of shield tool changing robot |
| CN115435947A (en) * | 2022-07-29 | 2022-12-06 | 西北核技术研究所 | Film type sensor for underground stress test and mounting method thereof |
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2015
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107907407A (en) * | 2017-09-27 | 2018-04-13 | 同济大学 | A kind of new rubber gasket compression stress performance testing device and method |
| CN109374865A (en) * | 2018-12-07 | 2019-02-22 | 华侨大学 | A kind of shield tunnel scaled model considering curved bolt clipping forcee and production method |
| CN109668580A (en) * | 2018-12-10 | 2019-04-23 | 上海交通大学 | Pressure-sensitive films, sensor, sensor array and respective preparation method |
| CN109668580B (en) * | 2018-12-10 | 2021-04-13 | 上海交通大学 | Pressure sensitive film, sensor array and respective preparation method |
| CN109709212A (en) * | 2019-02-26 | 2019-05-03 | 上海声望声学科技股份有限公司 | A kind of sealing strip sound insulation measurement auxiliary mould and test macro |
| CN109883678A (en) * | 2019-03-25 | 2019-06-14 | 宁波用躬科技有限公司 | Predict the experimental rig and its test method of water-swellable gasket service life |
| CN113021822A (en) * | 2021-03-26 | 2021-06-25 | 王天寿 | Three-dimensional net and double-screw extruder for producing same |
| CN113390628A (en) * | 2021-05-20 | 2021-09-14 | 东南大学 | Device and method for testing waterproof performance degradation under circulating load action of shield segment sealing gasket |
| CN114923677A (en) * | 2022-06-02 | 2022-08-19 | 中南大学 | Fatigue testing device and method for sealing piece of storage cabin gate of shield tool changing robot |
| CN115435947A (en) * | 2022-07-29 | 2022-12-06 | 西北核技术研究所 | Film type sensor for underground stress test and mounting method thereof |
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