CN107727836A - Tunnel Lining Cracks determination experiment device and method containing sprayed coating - Google Patents

Tunnel Lining Cracks determination experiment device and method containing sprayed coating Download PDF

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Publication number
CN107727836A
CN107727836A CN201711208550.2A CN201711208550A CN107727836A CN 107727836 A CN107727836 A CN 107727836A CN 201711208550 A CN201711208550 A CN 201711208550A CN 107727836 A CN107727836 A CN 107727836A
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China
Prior art keywords
sprayed coating
tunnel lining
crack
width
cracks
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CN201711208550.2A
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李科
江星宏
丁浩
崔航
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China Merchants Chongqing Communications Research and Design Institute Co Ltd
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China Merchants Chongqing Communications Research and Design Institute Co Ltd
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Priority to CN201711208550.2A priority Critical patent/CN107727836A/en
Publication of CN107727836A publication Critical patent/CN107727836A/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/38Concrete; Lime; Mortar; Gypsum; Bricks; Ceramics; Glass
    • G01N33/383Concrete or cement
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/04Lining with building materials
    • E21D11/10Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Architecture (AREA)
  • Mining & Mineral Resources (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Structural Engineering (AREA)
  • Food Science & Technology (AREA)
  • Physics & Mathematics (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Analytical Chemistry (AREA)
  • Medicinal Chemistry (AREA)
  • Civil Engineering (AREA)
  • Ceramic Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Lining And Supports For Tunnels (AREA)

Abstract

The invention discloses a kind of Tunnel Lining Cracks determination experiment device and method containing sprayed coating, pass through a kind of experimental provision that can effectively determine the Tunnel Lining Cracks containing sprayed coating of independent research, the relation data of coating surface crack and Lining Crack is obtained using laboratory method, the Tunnel Lining Cracks containing sprayed coating are effectively determined by the crack on coating top layer.It is cost-effective using above-mentioned technical proposal, it can more truly, comprehensively determine the Tunnel Lining Cracks depth containing coating.

Description

Tunnel Lining Cracks determination experiment device and method containing sprayed coating
Technical field
The present invention relates to a kind of Tunnel Lining Cracks determination experiment device and method containing sprayed coating.
Background technology
With the development of country and the development of traffic technique, tunnel is not limited solely to pass through mountain range, crosses river and crosses straits Tunnel structure increases gradually., it is necessary to check the crack situation of lining cutting in the maintenance repair work of mountain tunnel.But in some tunnels , it is necessary to which brushing fireproof coating, this just brings inconvenience for tunnel current check service work in road.The crack on coating top layer is not The crack progressing situation of coating behind lining cutting can truly be reflected, this just need carry out experimental study, find out coating surface crack with The relation of Lining Crack.In addition, submerged tunnel structures gradually increase at present, relative to mountain tunnel, these submerged tunnel institutes The technological challenge that faces, scientific research problem are more.Wherein, submerged tunnel structure is more quick with respect to mountain tunnel to Lining Crack Sense, this concerns total traffic safety.Submerged tunnel is design of preventing and reducing natural disasters, most of all to have depositing for fireproof coating layer Tunnel Lining Cracks determination experiment device and method containing sprayed coating, solution is being provided to problems.
Found by being retrieved to existing technical literature, throw away lack experimental provision and method at present, can effectively determined containing spray The Tunnel Lining Cracks of coating.The present invention have developed a kind of tunnel lining that can effectively determine containing sprayed coating by research of technique Build the experimental provision in crack.
The content of the invention
In view of this, it is an object of the invention to provide a kind of Tunnel Lining Cracks determination experiment device containing sprayed coating and side Method, makes it have cost-effective, can more truly, comprehensively determine the Tunnel Lining Cracks depth containing coating.
On the one hand, the present invention provides a kind of Tunnel Lining Cracks determination experiment device containing sprayed coating, including:Vertical frame Body, pressue device, support base and New Instrument for Crack Width, the pressue device be arranged on the middle part of the inside top of vertical framework and to Lower extension, the support base are arranged at intervals two in the bottom inside of vertical framework, formed between pressue device and support base The test space of lining cutting sample block is placed, the New Instrument for Crack Width is measuring the fracture width of lining cutting sample block sprayed coating.
Further, one in two support bases is fixed-hinged support, and another is slip hinged-support.
Further, the pressue device includes:It is vertically arranged in the jack and water of the inside top of vertical framework The flat transfer beam for being arranged on jack lower end, the horizontal-extending direction of the transfer beam and the septal direction phase of two support bases Together.
Further, the transfer beam is contacted by a fixed strip and an activity bar with lining cutting sample block, and described solid Bar is determined close to the fixed-hinged support side, and the activity bar is close to the slip hinged-support side.
On the other hand, the present invention also proposes a kind of Tunnel Lining Cracks containing sprayed coating carried out using above-mentioned experimental provision Assay method, comprise the following steps:
S1. the concrete block of simulated experiment lining cutting sample block is made, using 1:1 intensity, according to corresponding number of track-lines And Surrounding Rock Strength, corresponding concrete block size is chosen, is molded from corresponding concreting;
S2. after concrete block maintenance reaches normal intensity, progressively brushing fire proofing wood is layered in a side of concrete block Material forms sprayed coating, and every layer of brushing thickness is no more than 8mm, and last layer brushing is uniform, leveling, sprayed coating is reached expected fire resisting The thickness of limit requirements, complete the making of lining cutting sample block;
S3. the lining cutting sample block of prefabricated completion is placed on the support base of experimental provision and carries out loading experiment, pass through pressurization Device multistage loadings, observe the crack situation of sprayed coating and the crack progressing situation of concrete block;
S4. when crack occurs in concrete block itself, record concrete block the penetration of fracture and sprayed coating crack it is wide Degree;Subsequent multistage loadings, record the depth and width in crack successively, until damaging by pressure.
Further, after step S4, according to the obtained penetration of fracture and width data, sprayed coating slit width degree and tunnel are obtained The relation of road Lining Crack depth, and the relation of sprayed coating fracture width and tunnel lining crack width.
Further, the concrete block in step S1, according to corresponding number of track-lines and Surrounding Rock Strength, take plain concrete or Armored concrete, using 1:1 dimension scale pouring molding.
Further, placement of the lining cutting sample block in experimental provision in step S3, it is divided into sprayed coating and exists in lower and sprayed coating Upper two kinds of situations, to simulation tunnel respectively in vault by the situation at sagging moment and haunch by hogging moment.
Further, in step S4, using the penetration of fracture of tape measure concrete block, measured and sprayed using New Instrument for Crack Width The fracture width of coating.
Beneficial effects of the present invention have:
1) test method of the invention, using prefabricated lining cutting sample block simulation tunnel lining cutting, using 1:1 ratio, very It is real to reflect actual crack progressing situation;
2) test method of the invention, using the brushing fireproof coating on precast concrete block, to simulate actual work Lining cutting external coating fireproof coating in journey, reduces live actual environment, and obtained data are true, and reliability is high;
3) test method of the invention, using load mode, the concrete block with fire prevention sprayed coating is made gradually to go out Existing crack, obtains effective intermediate data, carries out experimental study, and result of study has the convincingness of science;
4) experimental provision provided by the invention, simple and reasonable, pressurization step by step is tested, can real simulation tunnel lining The live stressing conditions of block, obtain scientific and reasonable experimental data.
Other advantages, target and the feature of the present invention will be illustrated in the following description to a certain extent, and And to a certain extent, based on will be apparent to those skilled in the art to investigating hereafter, Huo Zheke To be instructed from the practice of the present invention.
Brief description of the drawings
Fig. 1 is the dimensional structure diagram of experimental provision of the embodiment of the present invention;
Fig. 2 is the positive structure diagram of experimental provision of the embodiment of the present invention;
Reference:The vertical framework of 100- experimental provisions, 1-, 2- pressue devices, 21- jack, 22- transfer beams, 23- are solid Determine bar, 24- activity bars, 3- support bases, 3a- fixed-hinged supports, 3b- and slide hinged-support, 4- New Instrument for Crack Width, 200- lining cutting samples Block, 201- concrete blocks, 202- sprayed coatings.
Embodiment
To be easy to understand the technical means, the inventive features, the objects and the advantages of the present invention, with reference to Embodiment, the present invention is expanded on further.
Refer to Fig. 1 and Fig. 2, the Tunnel Lining Cracks determination experiment device 100 provided by the invention containing sprayed coating, bag Include:Vertical framework 1, pressue device 2, support base 3 and New Instrument for Crack Width 4, pressue device 2 are arranged in the top of vertical framework 1 The middle part of side simultaneously extends downwardly, and support base 3 is arranged at intervals two in the bottom inside of vertical framework, in pressue device 2 and support Form the test space for placing lining cutting sample block 200 between seat 3, New Instrument for Crack Width 4 is measuring the sprayed coating 202 of lining cutting sample block 200 Fracture width.
Referring to Fig. 1 and Fig. 2, the pressue device 2 in the present embodiment includes:It is vertically arranged in the inside top of vertical framework 1 Jack 21 and be horizontally set on the transfer beam 22 of the lower end of jack 21, the horizontal-extending direction of the transfer beam 22 with two The septal direction of support base 3 is identical, to ensure that the lining cutting sample block 200 being crossed on two support bases 3 can be by setting in the same direction The uniform stressed of transfer beam 22, more press close to truth simulation tunnel lining cutting scene force environment.One in two support bases 3 Individual is fixed-hinged support 3a, and another is slides hinged-support 3b, so that lining cutting sample block 200 can pass through sliding hinge in stress Septal direction transverse shiftings of the bearing 3b along support base 3, so can accurately reflect when there is crack crack actual width and Depth, ensure the accuracy and availability of experiment the data obtained.Meanwhile transfer beam 22 is arranged to by a He of fixed strip 23 The form that one activity bar 24 contacts with lining cutting sample block 200, the fixed strip 23 lean on close to fixed-hinged support 3a sides, activity bar 24 It is near to slide hinged-support 3b sides, and then lining cutting sample block 200 effect of upper and lower surface synchronous horizontal sliding, disappears in stress Except the resistance for preventing fracture open, the accuracy of experimental data is further ensured that.
On the basis of above-mentioned experimental provision 100, the present invention proposes a kind of Tunnel Lining Cracks measure containing sprayed coating Method, the present embodiment are tested by taking two track three-level country rock standards as an example, comprised the following steps:
S1. the concrete block 201 of simulated experiment lining cutting sample block 200 is made, using 1:1 intensity, according to corresponding Number of track-lines and Surrounding Rock Strength, corresponding concrete block size is chosen, be molded from corresponding concreting;Because the present embodiment takes two Track three-level country rock standard, so corresponding select C30 plain concretes, using 1:1 dimension scale, pour size for 35cm × 35cm × 100cm concrete block 201;
S2. after the maintenance of concrete block 201 reaches normal intensity, in a side of concrete block 201, layering is progressively brushed Fire proofing material forms sprayed coating 202, and every layer of brushing thickness is no more than 8mm, and last layer brushing is uniform, leveling, makes sprayed coating 202 Reach the thickness of expected fire endurance requirement, complete the making of lining cutting sample block 200;Specifically, in the present embodiment, calculated according to calculating After going out the coatings volume number needed altogether, according to mass distribution, 7mm thickness fireproof coatings are brushed for the first time, second of brushing 7mm is thick Fireproof coating, third time brush 4mm thickness fireproof coatings, and last time smears uniform, leveling, finally makes the thickness of sprayed coating 202 18mm is maintained at, meets 2h fire endurance requirements;
S3. the lining cutting sample block 200 of prefabricated completion is placed on the support base 3 of experimental provision 100 and carries out loading experiment, led to The multistage loadings of over pressurizeed device 2, observe the crack situation of sprayed coating 202 and the crack progressing situation of concrete block 201;
S4. when concrete block 201 itself crack occurs, the penetration of fracture and sprayed coating 202 of concrete block 201 are recorded Fracture width, the specific penetration of fracture for using tape measure concrete block 201, sprayed coating 202 is measured using New Instrument for Crack Width 4 Fracture width, subsequent multistage loadings, the depth and width in crack are recorded successively, until damage by pressure.
According to the penetration of fracture and width data obtained among step S4, the slit width degree of sprayed coating 202 and tunnel-liner are obtained The relation of the penetration of fracture, and the relation of the fracture width of sprayed coating 202 and tunnel lining crack width, reach the effect of experiment needs Fruit.
Meanwhile 200 placement in experimental provision 100 of lining cutting sample block in step S3, it is divided into sprayed coating 202 in lower and spraying Layer 202 is in upper two kinds of situations, to simulation tunnel respectively in vault by the situation at sagging moment and haunch by hogging moment, so as to To more comprehensive and sufficient experimental data.
Experiment to carry out other standards, such as two track level Four country rock standards, then only need to be marked according to specific experiment The size of change concrete block 201, repeats the above steps corresponding to accurate, further according to the requirement of corresponding fire endurance, change fire prevention The thickness of coating sprayed coating 202, repeat above-mentioned experiment.
Finally illustrate, the above embodiments are merely illustrative of the technical solutions of the present invention and it is unrestricted, although with reference to compared with The present invention is described in detail good embodiment, it will be understood by those within the art that, can be to the skill of the present invention Art scheme is modified or equivalent substitution, and without departing from the objective and scope of technical solution of the present invention, it all should cover at this Among the right of invention.

Claims (9)

  1. A kind of 1. Tunnel Lining Cracks determination experiment device containing sprayed coating, it is characterised in that including:Vertical framework, pressurization dress Put, support base and New Instrument for Crack Width, the pressue device are arranged on the middle part of the inside top of vertical framework and extended downwardly, institute The bottom inside that support base is stated in vertical framework is arranged at intervals two, is formed between pressue device and support base and places lining cutting sample The test space of block, the New Instrument for Crack Width is measuring the fracture width of lining cutting sample block sprayed coating.
  2. 2. the Tunnel Lining Cracks determination experiment device according to claim 1 containing sprayed coating, it is characterised in that described in two One in support base is fixed-hinged support, and another is slip hinged-support.
  3. 3. the Tunnel Lining Cracks determination experiment device according to claim 2 containing sprayed coating, it is characterised in that described to add Pressure device includes:It is vertically arranged in the jack of the inside top of vertical framework and is horizontally set on the power transmission of jack lower end Beam, the horizontal-extending direction of the transfer beam are identical with the septal direction of two support bases.
  4. 4. the Tunnel Lining Cracks determination experiment device according to claim 3 containing sprayed coating, it is characterised in that the biography Power beam is contacted by a fixed strip and an activity bar with lining cutting sample block, and the fixed strip is close to the fixed-hinged support one Side, the activity bar is close to the slip hinged-support side.
  5. 5. a kind of Tunnel Lining Cracks assay method containing sprayed coating, it is characterised in that usage right is required described in any one of 1-4 The Tunnel Lining Cracks determination experiment device containing sprayed coating, comprise the following steps:
    S1. the concrete block of simulated experiment lining cutting sample block is made, using 1:1 intensity, according to corresponding number of track-lines and enclose Rock intensity, corresponding concrete block size is chosen, be molded from corresponding concreting;
    S2. after concrete block maintenance reaches normal intensity, progressively brushing fire proofing material shape is layered in a side of concrete block Into sprayed coating, every layer of brushing thickness is no more than 8mm, and last layer brushing is uniform, leveling, sprayed coating is reached expected fire endurance It is required that thickness, complete lining cutting sample block making;
    S3. the lining cutting sample block of prefabricated completion is placed on the support base of experimental provision and carries out loading experiment, pass through pressue device Multistage loadings, observe the crack situation of sprayed coating and the crack progressing situation of concrete block;
    S4. when crack occurs in concrete block itself, the penetration of fracture of concrete block and the fracture width of sprayed coating are recorded;With Multistage loadings afterwards, record the depth and width in crack successively, until damaging by pressure.
  6. 6. the Tunnel Lining Cracks assay method according to claim 5 containing sprayed coating, it is characterised in that step S4 it Afterwards, according to the obtained penetration of fracture and width data, the relation of sprayed coating slit width degree and Tunnel Lining Cracks depth is obtained, and The relation of sprayed coating fracture width and tunnel lining crack width.
  7. 7. the Tunnel Lining Cracks assay method according to claim 5 containing sprayed coating, it is characterised in that
    Concrete block in step S1, according to corresponding number of track-lines and Surrounding Rock Strength, plain concrete or armored concrete are taken, is adopted With 1:1 dimension scale pouring molding.
  8. 8. the Tunnel Lining Cracks assay method according to claim 5 containing sprayed coating, it is characterised in that
    Placement of the lining cutting sample block in experimental provision in step S3, it is divided into sprayed coating in lower and sprayed coating in upper two kinds of situations, use With simulation tunnel respectively in vault by the situation at sagging moment and haunch by hogging moment.
  9. 9. the Tunnel Lining Cracks assay method according to claim 5 containing sprayed coating, it is characterised in that
    In step S4, using the penetration of fracture of tape measure concrete block, the crack that sprayed coating is measured using New Instrument for Crack Width is wide Degree.
CN201711208550.2A 2017-11-27 2017-11-27 Tunnel Lining Cracks determination experiment device and method containing sprayed coating Pending CN107727836A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109374432A (en) * 2018-12-13 2019-02-22 西南交通大学 The moment of flexure alternating loading device and method of shield duct piece connector experiment on flexural behavior machine
CN109827824A (en) * 2019-03-21 2019-05-31 招商局重庆交通科研设计院有限公司 A kind of device making geotechnical sample crack
CN117054516A (en) * 2023-07-11 2023-11-14 西南科技大学 Experimental device and method for simulating real form of lining crack of high-speed railway tunnel

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109374432A (en) * 2018-12-13 2019-02-22 西南交通大学 The moment of flexure alternating loading device and method of shield duct piece connector experiment on flexural behavior machine
CN109827824A (en) * 2019-03-21 2019-05-31 招商局重庆交通科研设计院有限公司 A kind of device making geotechnical sample crack
CN109827824B (en) * 2019-03-21 2024-01-30 招商局重庆交通科研设计院有限公司 Device for manufacturing geotechnical sample cracks
CN117054516A (en) * 2023-07-11 2023-11-14 西南科技大学 Experimental device and method for simulating real form of lining crack of high-speed railway tunnel
CN117054516B (en) * 2023-07-11 2024-05-31 西南科技大学 Experimental device and method for simulating real form of lining crack of high-speed railway tunnel

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