CN201818314U - Lining segment of shield with gradient function - Google Patents
Lining segment of shield with gradient function Download PDFInfo
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- CN201818314U CN201818314U CN2010201832676U CN201020183267U CN201818314U CN 201818314 U CN201818314 U CN 201818314U CN 2010201832676 U CN2010201832676 U CN 2010201832676U CN 201020183267 U CN201020183267 U CN 201020183267U CN 201818314 U CN201818314 U CN 201818314U
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Abstract
The utility model discloses a lining segment of a shield with a gradient function, which structurally comprises a reinforced concrete outer protective layer, a reinforced concrete outer structural layer, a steel fiber reinforced concrete strengthened and toughened inner structural layer and a steel fiber reinforced concrete strengthened and toughened inner protective layer in sequence from top to bottom. The reinforced concrete outer protective layer and the reinforced concrete outer structural layer are connected into a whole and are made of high-performance concrete with the strength grade higher than or equal to C50 and the slump being 30-70mm; and the steel fiber reinforced concrete strengthened and toughened inner structural layer and the steel fiber reinforced concrete strengthened and toughened inner protective layer are connected into a whole and are made of steel fiber concrete with the strength grade higher than or equal to C50 and the slump being 30-70mm. Since the strengthened and toughened structural layer is formed in tensile zones, on edges and at corners of the inner side of the segment, the toughness and shear strength of concrete on the edges and at the corners of the inner side of the segment are improved, and the cracking resistance of concrete in the tensile zones of the inner side of the segment is also improved, thus the overall damage rate can be greatly reduced during segment construction, and the carbonation resistance of the segment can be enhanced; and the utility model overcomes the defect that the production cost of a single segment is greatly increased when the segment is completely made of high-toughness concrete.
Description
(1) technical field
The utility model relates to a kind of gradient function shield structure lining segment, belongs to construction of tunnel material and product technique field.
(2) background technology
Shield construction has become the main method of building subterranean tunnel, river-crossing tunnel and pipe works in the soft soil layer of city at present.In shield method, by the assembled tunnel lining structure body of some prefabricated pipe sections, wherein precast concrete section of jurisdiction (hereinafter to be referred as the section of jurisdiction) is not only the primary structure form of shield tunnel, it also is the assurance of tunnel water proofing, fire prevention and combination property such as durable, therefore, very high request has all been proposed in aspects such as section of jurisdiction intensity, rigidity and durability.
Because urban construction needs, and has developed multiple novel shield structure technology abroad, but slow relatively to the research of shield structure lining segment, at present still based on reinforced concrete segment.Because concrete is a fragile material, tensile property is poor, and therefore, in transportation, installation process, breakage easily takes place in the section of jurisdiction.Engineering practice shows that the reinforced concrete segment disrepair phenomenon generally occurs in the inboard bight of lining segment, based on surperficial concrete local shear failure takes place under the power effect of jack top, and at the rare generation disrepair phenomenon in middle part, section of jurisdiction.By taking the effective technology measure, particularly control reinforced concrete segment assembly unit operational quality, section of jurisdiction disrepair phenomenon occurrence probability can reduce about 50% more originally, but can't solve fully all the time, this is determined by the deadly defect that concrete itself is fragility, therefore, improving the concrete shock resistance in section of jurisdiction and tension, shear strength is the key point that solves the section of jurisdiction damaging problem.
In view of damaged shortcoming easily takes place in transportation, installation process reinforced concrete segment, develop novel shield structure lining segment and just becoming various countries' research focus.In recent years, a kind of novel shield duct piece---the steel fiber concrete pipe sheet draws attention abroad, and has carried out tentative application in some engineerings.Compare with ordinary concrete, steel fibrous concrete has good shock resistance and shear strength, the section of jurisdiction of adopting the steel fibrous concrete preparation construction period breakage rate will reduce greatly, thereby obviously improve the water resistance of tunnel lining; Because steel fibre has inhibitory action to concrete cracking, under stressed same case, the situation of steel fibrous concrete cracking will significantly reduce, and the width in crack also dwindles, thereby can improve the durability of section of jurisdiction.Yet the steel fibre material price is higher, adopts steel fibrous concrete will significantly increase section of jurisdiction initial investment cost, and this is the deadly defect of steel fiber concrete pipe sheet.
On the other hand, the long durability that uses in environment of subway section of jurisdiction also is the major issue of people's common concern.ZL200510120533.4 provides a kind of preparation method of shield tunnel lining segment; its structure is: outside-in; be high fine and close waterproofing course, reinforced concrete protective layer, reinforced concrete structure layer and fire prevention bursting layer successively; the high water proof anti-seepage layer of the common formation of high fine and close waterproofing course and topping; its whole impervious grade 〉=P30, Cl
-Diffusion coefficient≤1 * 10
-13m
2/ s, 28d drying shrinkage value≤250 microstrains.Yet, for buried at the bottom of underground (as subway), river or the reinforced concrete segment of seabed (as river-crossing tunnel or seabed tunnel) does not exist usually because the problems such as corrosion of steel bar that cause of chloride permeability, even its reason is owing to there is phenomenon such as chloride permeability, but underground or oxygen content is very low under water; Because good waterproofing work has been carried out in the section of jurisdiction, the oxygen of tunnel internal also is difficult to be penetrated into the outside, section of jurisdiction, thereby the rebar surface in the outside, section of jurisdiction is anaerobic condition, and its corrosion of steel bar problem is not generally considered when design.The corrosion of steel bar problem that chloride permeability causes then need be considered in the section of jurisdiction of the part that links to each other for shallow embedding in the chloride environment or with the outside.Inboard because the corrosion of steel bar that carbonization causes also should cause enough attention for the section of jurisdiction, this is because tunnel internal ventilation situation is relatively poor, the CO in the tunnel
2Content is often higher.Simultaneously, have certain humidity in the tunnel usually, carbonation of concrete is often relatively more serious.Therefore how improving inboard concrete anti-carbonization in section of jurisdiction and cracking resistance is to need the key issue of solution emphatically.
(3) summary of the invention
For solving cracky, poor durability that existing reinforced concrete segment exists, all adopting the high tenacity concrete to prepare problems such as section of jurisdiction cost height, the utility model provides a kind of gradient function shield structure lining segment.
For solving the problems of the technologies described above, the technical scheme that the utility model is taked is:
A kind of gradient function shield structure lining segment, its structure comprise steel concrete external protection, steel concrete external structure layer, steel fiber reinforced concrete Strengthening and Toughening inner structure layer and steel fiber reinforced concrete Strengthening and Toughening inner protective layer from top to bottom successively; Described steel concrete external protection and steel concrete external structure layer are connected as a single entity, and are that the high performance concrete of 30～70mm is made by strength grade 〉=C50, the slump; Described steel fiber reinforced concrete Strengthening and Toughening inner structure layer and steel fiber reinforced concrete Strengthening and Toughening inner protective layer are connected as a single entity, and are that the steel fibrous concrete of 30～70mm is made by strength grade 〉=C50, the slump.
Generally speaking, for shield structure lining segment, wherein contain cage of reinforcement; usually with the interior outside main muscle specification configuration layer and topping on the cage of reinforcement; between the main muscle in the interior outside is deck, and the main muscle in the outside is above to be external protection, and inboard main muscle is following to be inner protective layer.
The utility model recommends the described steel concrete external protection 4 and the thickness of steel concrete external structure layer 3 to be respectively 40～60mm and 300～400mm; The thickness of described steel fiber reinforced concrete Strengthening and Toughening inner structure layer 2 and steel fiber reinforced concrete Strengthening and Toughening inner protective layer 1 is respectively 20～90mm and 50～60mm.
Further, can also brush corrosion-inhibiting coating on the steel concrete external protection 4 described in the utility model, make: anti-corrosive paint of epoxy resin, anti-corrosion polyurethane coating, JS water-repellent paint, organosilicon concrete protective agent by following a kind of anticorrosive paint.The thickness of described corrosion-inhibiting coating is recommended as 0～5.0mm, and described " 0 " expression can be substantially equal to zero, but non-vanishing.
Further; preferred version of the present utility model is: described gradient function shield structure lining segment; its structure is followed successively by the steel fiber reinforced concrete Strengthening and Toughening inner protective layer of steel concrete external structure layer, 20～90mm steel fiber reinforced concrete Strengthening and Toughening inner structure layer and 50～60mm of steel concrete external protection, the 300～400mm of corrosion-inhibiting coating, the 40～60mm of 0～5.0mm from top to bottom.
Steel fibrous concrete described in the utility model is mixed together by the preparation raw material, it adopts prior art to be prepared, the preparation raw material of described steel fibrous concrete generally includes cementitious material, steel fibre, natural sand, grating is the stone of 5～25mm, high efficiency water reducing agent or high-performance water reducing agent and water, the inventory of each raw material is expressed as with mass parts: 1.00 parts of cementitious material, 0.10～0.18 part of steel fibre, 1.50～2.50 parts of natural sands, grating is 2.50～3.20 parts in the stone of 5～25mm, 0.01～0.02 part of high efficiency water reducing agent or high-performance water reducing agent, 0.30～0.35 part in water; Described cementitious material is one or both the mixture in cement or cement and flyash, the slag micropowder.
Further, the inventory of flyash is 0～0.15 part in the preparation raw material of described steel fibrous concrete.
Further, the inventory of slag micropowder is 0～0.30 part in the preparation raw material of described steel fibrous concrete.
High performance concrete described in the utility model is mixed together by the preparation raw material, it adopts prior art to be prepared, it is stone, high efficiency water reducing agent or high-performance water reducing agent and the water of 5～25mm that the preparation raw material of described high performance concrete generally includes cementitious material, sand, grating, and the inventory of each raw material is expressed as with mass parts: 1.00 parts of cementitious material, 1.50～1.90 parts in sand, grating are 2.50～3.20 parts in stone, high efficiency water reducing agent or 0.01～0.02 part of high-performance water reducing agent, 0.25～0.35 part in the water of 5～25mm; Described cementitious material is one or both the mixture in cement or cement and flyash, the slag micropowder.
Further, the inventory of flyash is 0～0.15 part in the preparation raw material of described high performance concrete.
Further, the inventory of slag micropowder is 0～0.30 part in the preparation raw material of described high performance concrete.
Compared with prior art, the beneficial effect of functional gradient shield lining segment described in the utility model is mainly reflected in: (1) has formed the Strengthening and Toughening deck in tensile region, inboard, section of jurisdiction and position, corner, the toughness of concrete and the concrete cracking resistance of shear strength and tensile region of inner side edge angular position, section of jurisdiction have been improved, can significantly reduce the whole breakage rate in the work progress of section of jurisdiction, and improve the anti-carbonation properties of section of jurisdiction; (2) deficiency of having avoided whole employing obdurability concrete to cause single section of jurisdiction cost of production to increase substantially; (3) form corrosion protective covering in the outside, section of jurisdiction, significantly improve section of jurisdiction concrete impermeability in the outside and chloride-penetration resistance ability, improve the section of jurisdiction durability.
(4) Figure of description
Figure 1 shows that the gradient function shield structure lining segment function design diagram of the utility model embodiment 8-10, wherein 1 steel fiber reinforced concrete Strengthening and Toughening inner protective layer; 2 steel fiber reinforced concrete Strengthening and Toughening inner structure layers; 3 steel concrete external structure layers; 4 steel concrete external protections; 5 corrosion-inhibiting coatings, and be inboard main muscle between steel fiber reinforced concrete Strengthening and Toughening inner protective layer 1 and the steel fiber reinforced concrete Strengthening and Toughening inner structure layer 2, between steel concrete external structure layer 3 and the steel concrete external protection 4 the main muscle in the outside.
Figure 2 shows that gradient function shield structure lining segment preparation technology flow chart.
(5) specific embodiment
The utility model is a kind ofly to carry out hierarchical design based on the gradient function design principle, the shield structure lining segment that is used for construction of tunnel that adopts laminated pouring and spraying coating process to be prepared from.Below in conjunction with specific embodiment the utility model is described further, but protection domain of the present utility model is not limited in this.
The preparation gradient function shield structure lining segment structure as depicted in figs. 1 and 2: from top to bottom, be reinforced concrete segment corrosion-inhibiting coating 1, steel concrete external protection 2 and external structure layer 3, steel fiber reinforced concrete Strengthening and Toughening inner structure layer 2 and inner protective layer 1 successively.
Above-mentioned reinforced concrete segment corrosion-inhibiting coating 5 is formed through spraying by anticorrosive paint, and thickness is 0～4.0mm.Steel concrete external protection 4 and steel concrete external structure layer 3 thickness are respectively 300～400mm and 40～60mm.Steel fiber reinforced concrete Strengthening and Toughening inner structure layer 2 and steel fiber reinforced concrete Strengthening and Toughening inner protective layer 1 thickness are respectively 50～60mm and 20～90mm.
The preparation method of the utility model gradient function shield structure lining segment is: lay reinforcing cage and relevant built-in fitting according to designing requirement earlier in the reinforced concrete segment punching block, pour into a mould strength grade 〉=C50 then, the slump is the steel fibrous concrete of 30～70mm, vibration compacting, Strengthening and Toughening inner protective layer 1 that formation is connected as a single entity and inner structure layer 2, cast thickness is for being respectively 50～60mm and 20～90mm, on the inboard Strengthening and Toughening deck 2 of reinforced concrete segment, continue placing intensity grade 〉=C50 then, the slump is the high performance concrete of 30～70mm, and vibration compacting, reinforced concrete structure layer 3 that formation is connected as a single entity and steel concrete external protection 4 are built thickness and are respectively 300～400mm and 40～60mm; Build and carry out the thick light in surface after finishing immediately, treat to carry out middle light after concrete is received water, when treating concrete near initial set, carry out with nothing leftly, 2～3h rests after the whole initial sets of concrete, carry out stream curing then, be warming up to 35～45 ℃ in 2～3h, constant temperature 2～3h, 2～3h is to room temperature in cooling, adopt the vacuum cup molding, carry out water curing after visual inspection and the maintenance.Lifting is to the stockyard, section of jurisdiction behind water curing 7～14d, and behind air dry 2～5d, the outside, the section of jurisdiction after air dry sprays the reinforced concrete segment corrosion-inhibiting coating as required, and its thickness is 0～4.0mm.Preparation technology's flow process is seen Fig. 2.
Embodiment 1～3:
Adopt conch PII52.5 cement, shear straight little type steel fibers (production of Jiaxing City longitude and latitude steel fibre Co., Ltd), II level flyash, Sha Gang S95 slag micropowder, natural medium sand, 5～25mm rubble and HG-PCA600 type high-performance water reducing agent preparation C50 steel fibrous concrete and C50 ordinary concrete turned round, and being used for the production of gradient function shield structure lining segment, concrete mix sees Table 1 respectively.
Table 1
Adopt conch PII52.5 cement, Jiaxing longitude and latitude to shear and straightly littlely turn round type steel fibers, II level flyash, Sha Gang S95 slag micropowder, natural medium sand, 5～25mm rubble, HG-PCA600 type high-performance water reducing agent preparation steel fibrous concrete and ordinary concrete, and be used for the production of gradient function shield structure lining segment.Lifting is to the stockyard, section of jurisdiction behind gradient function section of jurisdiction water curing 7～14d that production obtains; respectively behind air dry 2d, 4d and the 5d; in the outside, section of jurisdiction brushing 881-H04 type epoxy coating, JS waterproof coating, 881-Y01 type polyurethane waterproof coating and the agent of PC-40 type organosilicon immersion type concrete protective, its brushing thickness is respectively 2.0mm, 4.0mm, 0.3mm.Concrete mix sees Table 3 respectively.
Table 3
The section of jurisdiction concrete performance that embodiment produced is tested, and the performance of test comprises:
When (1) section of jurisdiction produces, moulding high performance concrete and high-performance steel fibrous concrete standard cube body test specimen, behind condition maintenance 3d and 28d, test concrete crushing strength, splitting tensile strength by the method that " standard for test methods of mechanical properties of ordinary concrete " (GB/T50081-2002) stipulated;
(2) moulding 150 * 150 * 550mm prism test specimen behind the maintenance 28d, cuts out the otch that the degree of depth is about 10mm in concrete base, adopts the electro-hydraulic servo universal testing machine to measure concrete load-deformation curve then, and record concrete fracture load.Size Effects on Fracture Toughness of Concrete is calculated as follows:
Wherein
H is the test specimen height in the formula, and a is a notch depth, and P is a breaking load, and l is a span, and b is a specimen width.
(3) moulding 100 * 100 * 400mm test specimen behind the maintenance 28d, by " steel fibrous concrete test method " (CECS 13:89), is measured concrete shear strength.
(4) moulding 175mm * 185mm * 150mm truncated cone-shaped test specimen behind the maintenance 28d, (GB50082-1985) is measured its impervious grade by " Standard for test methods of longterm performance and durability of ordinary concrete ".
(5) core sampling is carried out in the section of jurisdiction after, press the resistance of chloride ion penetration of ASTM C1202 specimen.
The section of jurisdiction The performance test results that each embodiment production obtains is as shown in table 4.
The every performance testing index in table 4 section of jurisdiction
By table 4 as seen; under the basic identical condition of match ratio; by the admixture steel fibre; can increase substantially the concrete shear strength of reinforced concrete segment inner protective layer; the shear strength increase rate is up to more than 70～80%; compound admixture polymer emulsion and organic fiber, section of jurisdiction inner protective layer anti-shear concrete intensity further improves, and therefore can significantly improve the resisting breakage ability of steel concrete.Actual assembly unit shows that also the breakage rate of the gradient function tunnel lining segment that obtains descends significantly, and the comparable ordinary concrete of breakage rate section of jurisdiction reduces more than 50～80%.
By table 4 also as can be seen; concrete external protection surface, gradient function section of jurisdiction is not during the brushing corrosion-inhibiting coating; its chloride ion permeability index 6h electric flux is all more than 1000C; according to American society association criterion ASTM C1202; its chloride ion permeability belongs to the low chlorine ion penetration range; but through further brushwork epoxy resin coating; the JS waterproof coating; behind polyurethane coating and the organosilan; outside core of concrete resistance of chloride ion penetration index 6h electric flux drops to 159.3C respectively; 586.4C; 395.8C and 725.1C; its chloride ion permeability belongs to very low chlorine ion penetration range; have good corrosion resistance, can be used for existing chloride permeability to cause the construction of tunnel of corrosion of steel bar hidden danger.
Claims (6)
1. gradient function shield structure lining segment, its structure comprises steel concrete external protection, steel concrete external structure layer, steel fiber reinforced concrete Strengthening and Toughening inner structure layer and steel fiber reinforced concrete Strengthening and Toughening inner protective layer from top to bottom successively; Described steel concrete external protection and steel concrete external structure layer are connected as a single entity, and are that the high performance concrete of 30～70mm is made by strength grade 〉=C50, the slump; Described steel fiber reinforced concrete Strengthening and Toughening inner structure layer and steel fiber reinforced concrete Strengthening and Toughening inner protective layer are connected as a single entity, and are that the steel fibrous concrete of 30～70mm is made by strength grade 〉=C50, the slump.
2. gradient function shield structure lining segment as claimed in claim 1; it is characterized in that also having corrosion-inhibiting coating on the described steel concrete external protection, described corrosion-inhibiting coating is made by following a kind of anticorrosive paint: anti-corrosive paint of epoxy resin, anti-corrosion polyurethane coating, JS water-repellent paint, organosilicon concrete protective agent.
3. gradient function shield structure lining segment as claimed in claim 1 or 2 is characterized in that the thickness of described steel concrete external protection and steel concrete external structure layer is respectively 40～60mm and 300～400mm; The thickness of described steel fiber reinforced concrete Strengthening and Toughening inner structure layer and steel fiber reinforced concrete Strengthening and Toughening inner protective layer is respectively 20～90mm and 50～60mm.
4. gradient function shield structure lining segment as claimed in claim 2, the thickness that it is characterized in that described corrosion-inhibiting coating is 0～5.0mm.
5. gradient function shield structure lining segment as claimed in claim 3, the thickness that it is characterized in that described corrosion-inhibiting coating is 0～5.0mm.
6. gradient function shield structure lining segment as claimed in claim 5; it is characterized in that described gradient function shield structure lining segment; its structure is followed successively by the steel fiber reinforced concrete Strengthening and Toughening inner protective layer of steel concrete external structure layer, 20～90mm steel fiber reinforced concrete Strengthening and Toughening inner structure layer and 50～60mm of steel concrete external protection, the 300～400mm of corrosion-inhibiting coating, the 40～60mm of 0～5.0mm from top to bottom.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103717836A (en) * | 2011-09-12 | 2014-04-09 | Sika技术股份公司 | Tubing having a thermoplastic barrier layer |
| CN106677798A (en) * | 2015-11-10 | 2017-05-17 | 天津乾丰机电设备有限公司 | Tunnel concrete pipe piece composite anti-corrosion structure and machining method thereof |
| CN108756953A (en) * | 2018-05-29 | 2018-11-06 | 中铁二院工程集团有限责任公司 | Guarded drainage system with secondary lining shield tunnel |
| CN109648694A (en) * | 2019-02-19 | 2019-04-19 | 兰州交通大学 | A kind of shield cement section of jurisdiction curved surface finisher |
| CN110821515A (en) * | 2019-09-30 | 2020-02-21 | 中铁隧道局集团建设有限公司 | Construction method of assembled supporting structure of tunnel in high and cold area |
| CN114409341A (en) * | 2022-02-11 | 2022-04-29 | 青岛光大集团大型构件有限公司 | Anti-carbonization corrosion-resistant concrete, preparation method thereof and lining segment |
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2010
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103717836A (en) * | 2011-09-12 | 2014-04-09 | Sika技术股份公司 | Tubing having a thermoplastic barrier layer |
| CN106677798A (en) * | 2015-11-10 | 2017-05-17 | 天津乾丰机电设备有限公司 | Tunnel concrete pipe piece composite anti-corrosion structure and machining method thereof |
| CN108756953A (en) * | 2018-05-29 | 2018-11-06 | 中铁二院工程集团有限责任公司 | Guarded drainage system with secondary lining shield tunnel |
| CN108756953B (en) * | 2018-05-29 | 2024-03-26 | 中铁二院工程集团有限责任公司 | Waterproof and drainage system with secondary lining shield tunnel |
| CN109648694A (en) * | 2019-02-19 | 2019-04-19 | 兰州交通大学 | A kind of shield cement section of jurisdiction curved surface finisher |
| CN109648694B (en) * | 2019-02-19 | 2024-03-01 | 兰州交通大学 | Shield cement segment curved surface trowelling machine |
| CN110821515A (en) * | 2019-09-30 | 2020-02-21 | 中铁隧道局集团建设有限公司 | Construction method of assembled supporting structure of tunnel in high and cold area |
| CN110821515B (en) * | 2019-09-30 | 2021-04-02 | 中铁隧道局集团建设有限公司 | Construction method of assembled supporting structure of tunnel in high and cold area |
| CN114409341A (en) * | 2022-02-11 | 2022-04-29 | 青岛光大集团大型构件有限公司 | Anti-carbonization corrosion-resistant concrete, preparation method thereof and lining segment |
| CN114409341B (en) * | 2022-02-11 | 2022-08-23 | 青岛光大集团大型构件有限公司 | Anti-carbonization corrosion-resistant concrete, preparation method thereof and lining segment |
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