CN100464056C - Technique for strengthening boundary face of functional gradient material of shield duct piece by using FRP rib - Google Patents
Technique for strengthening boundary face of functional gradient material of shield duct piece by using FRP rib Download PDFInfo
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- CN100464056C CN100464056C CNB2006101244827A CN200610124482A CN100464056C CN 100464056 C CN100464056 C CN 100464056C CN B2006101244827 A CNB2006101244827 A CN B2006101244827A CN 200610124482 A CN200610124482 A CN 200610124482A CN 100464056 C CN100464056 C CN 100464056C
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- frp
- reinforced concrete
- frp muscle
- muscle
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
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- Mechanical Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The present invention relates to a technical process for reinforcing functional gradient material interface of shield-driven tunnel concrete segment by utilizing FRP rib. Said technical process includes the following steps: (1), creating FRP rib anchorage reinforcement transition zone; laying and sticking flexible FRP mesh fabric on the surface of reinforcing cage in reinforced concrete segment steel mould, on the mesh fabric distributing FRP ribs according to the point lattice form to form FRP rib anchorage reinforcement transition zone, in which the FRP ribs and FRP mesh fabric are adhered together and formed into an integral structure; (2), in the reinforced concrete segment steel mould pouring the high-performance concrete whose strength grade is greater than C50 to upper surface of reinforcing cage to form reinforced concrete structure layer; and (3), utilizing pumping process to pour high-antipermeable protective concrete to surface of steel mould on the reinforced concrete structure layer to form high-antipermeable protective layer.
Description
Technical field
The present invention relates to a kind of FRP of utilization muscle and strengthen the technology of the functional gradient material interface of shield tunnel concrete pipe sheet.
Background technology
The environment for use in underground construction tunnel is compared with the civilian construction structure with the industry under the atmospheric environment, the factor that influences structure durability is more complicated, often to be subjected to the reciprocation of multiple destructive factor, thereby to shield tunnel concrete pipe sheet (or claim shield duct piece, or claim duct pieces of shield tunnel) demands for higher performance.Introduce the Functionally Graded Materials design principle, the concrete material that is used for the shield tunnel concrete pipe sheet is carried out hierarchical design, repeatedly builds (forming functional gradient material interface between layer and the layer), can optimize shield tunnel concrete pipe piece performance significantly, make structure durability strengthen greatly, effectively prolong its service life.But, because the sudden change that the difference of functional material component of different nature on characteristics such as physics, chemistry will inevitably be brought composite material interface layer performance, be continuity, the unity problem of boundary layer between the heterogeneity material component, if deal with improperly, can cause slippage, the cracking at interface, thereby cause the global failure of structure.Thereby, must strengthen effectively the functional gradient material interface of shield tunnel concrete pipe sheet, to strengthen its adhesive property, shear behavior etc., guarantee the stability of boundary layer.
Fibre reinforced plastics (FRP) muscle is a kind of reinforcing bar substitution material of superior performance, in civil engineering, have a wide range of applications, show following advantage: 1) specific strength height: tensile strength is better than common iron, is higher than 20% of same specification reinforcing bar, and anti-fatigue performance is good; 2) light weight: for 1/4 of volume reinforcing bar; 3) decay resistance is strong: the erosion that can resist chlorion and low pH value solution; 4) the material adhesion is strong: coefficient of thermal expansion is compared with steel more near cement, and therefore to combine bond stress stronger with cement (concrete); 5) designability is strong: modulus of elasticity is stable, dimensionally stable under the thermal stress, the thermoforming arbitrarily of shapes such as bending; 6) security performance is good: not heat conduction, non-conductive, flame-retardant and anti-static; 7) easy construction: can be processed into the standard and the non-standard component of various different cross sections and length, on-the-spot colligation can be used nonmetal puller strap, and is simple to operate.
At present, the FRP muscle is applied to the underground construction tunnel duct piece, and the functional gradient material interface of shield tunnel concrete pipe sheet is strengthened, patent, document etc. there is no report at home.
Summary of the invention
The object of the present invention is to provide a kind of technology of the functional gradient material interface of utilizing FRP rigidity of soft tissues shield duct piece of good stability, this technology can improve the endurance quality of shield duct piece, and then prolongs the service life of shield tunnel project.
To achieve these goals, technical scheme of the present invention is: a kind of technology of functional gradient material interface of the FRP of utilization rigidity of soft tissues shield duct piece, it is characterized in that: it comprises the steps:
1) sets up the anchoring of FRP muscle and strengthen transition region: lay and sticking flexible FRP grid cloth 5 on the surface of reinforcing cage 4 in the reinforced concrete segment punching block, press dot matrix distribution of shapes FRP muscle 3 on the flexible FRP grid cloth 5, form the anchoring of FRP muscle and strengthen transition region, wherein FRP muscle 3 and FRP grid cloth 5 are mutually bonding is an overall structure;
2) the cast strength grade forms reinforced concrete structure layer 1 greater than the high performance concrete of C50 to reinforcing cage upper surface in the reinforced concrete segment punching block;
3) then on reinforced concrete structure layer 1, adopt pumping technology to build high impervious topping concrete material, form high impervious topping 2 to the punching block surface.
Described FRP muscle anchoring reinforcement transition region thickness is decided to be 20mm～40mm (as thickness is 30mm, i.e. the length of FRP muscle) according to the length of FRP muscle 3.
FRP muscle 3 and flexible FRP grid cloth 5 are united formation FRP muscle interface anchoring strengthening material, and its preparation process is carried out prefabricated and production in enormous quantities in factory, can directly use in the shield duct piece preparation process, not influence construction speed.FRP muscle external surface is a thread structure, diameter 10mm～30mm, and length 20mm～40mm, the distribution of FRP muscle on grid cloth distributes by lattice-like, and the spacing between the two adjacent FRP muscle is: 50mm～90mm.
The present invention forms the FRP muscle anchoring interface enhancing transition region of the about 20～40mm of thickness between impervious topping 2 of height and reinforced concrete structure layer 1; FRP muscle top is stretched in the high impervious topping 2; the bottom is uniformly distributed on the flexible FRP grid cloth by lattice-like, and the FRP grid cloth is laid and is pasted on the reinforcing cage upper surface.The present invention strengthens functionally gradient concrete material interface owing to having introduced the FRP muscle, utilize stronger adhesion stress between itself and cement concrete, the difference in functionality material organically is linked to be an integral body, has eliminated weak district, interface, guaranteed stability, the continuity of boundary layer.Concrete manifestation goes out following advantage:
(1) fully guaranteed stronger adhesion strength between protective layer material (high impervious topping 2) and the structural material (reinforced concrete structure layer 1); at least double 28d adhesion strength 〉=5.0MPa (pressing the test of split tensile strength experimental technique) than common level and smooth stratiform interface binding intensity.
(2) by the reinforcement of FRP muscle, guarantee the boundary layer shear behavior preferably, pressed steel fibrous concrete experimental technique (CECS13:89) test, 28d interface shearing strength 〉=10.0MPa.
(3) FRP muscle interface anchoring strengthening material prefabricated and production in enormous quantities in factory process in actual concreting process, does not need the FRP muscle is done specially treated, than other interface processing modes, has effectively saved operation, does not influence construction speed substantially; Simple in structure, easy construction.
(4) utilize adhesion stress stronger between FRP muscle and the cement concrete, the FRP muscle is arranged at the boundary layer position of section of jurisdiction protective layer material and structural material, form the anchoring of FRP muscle and strengthen transition region, two kinds of functional materials are connected into an organic whole.With level and smooth stratiform interface without any processing, promote the adhesion strength, shear behavior at interface etc. effectively, solve difference in functionality gradient concrete material and produce problems such as relative slippage, cracking even unstability at the interface in level and smooth stratiform.Thereby guaranteed the stability at functional material interface, improved the endurance quality of shield duct piece, and then prolonged the service life of shield tunnel project.
Description of drawings
Fig. 1 is the functional gradient material interface schematic diagram of shield duct piece of the present invention.
Fig. 2 is the A portion enlarged drawing of Fig. 1.
Fig. 3 is that the FRP muscle dot matrix of the functional gradient material interface of shield duct piece of the present invention distributes and FRP grid cloth vertical view.
Among the figure: 1-reinforced concrete structure layer, the high impervious topping of 2-, 3-FRP muscle, 4-surface of reinforcing cage, the flexible FRP grid cloth of 5-.
The specific embodiment
In order to understand the present invention better, further illustrate content of the present invention below in conjunction with embodiment and accompanying drawing, but content of the present invention not only is confined to the following examples.
Embodiment 1:
As Fig. 1, Fig. 2, shown in Figure 3; a kind of technology of utilizing the functional gradient material interface of FRP rigidity of soft tissues shield duct piece; the reinforced concrete structure layer 1 and high impervious topping 2 phase-contact surfaces of shield tunnel concrete pipe sheet are functional gradient material interface, and it comprises the steps:
1) set up the anchoring of FRP muscle and strengthen transition region: FRP muscle 3 and flexible FRP grid cloth 5 are united formation FRP muscle interface anchoring strengthening material, the preparation process of FRP muscle 3 and flexible FRP grid cloth 5 is carried out prefabricated and production in enormous quantities in factory, in the shield duct piece preparation process, can directly use, not influence construction speed; FRP muscle external surface is a thread structure, diameter 20mm, and length 30mm, the distribution of FRP muscle on grid cloth distributes by lattice-like, and the spacing between the two adjacent FRP muscle is: 70mm.
Before the concrete pouring, lay and sticking flexible FRP grid cloth 5 on the surface of reinforcing cage 4 in the reinforced concrete segment punching block, press dot matrix distribution of shapes FRP muscle 3 on the flexible FRP grid cloth 5, form the anchoring of FRP muscle and strengthen transition region, wherein FRP muscle 3 and FRP grid cloth 5 are mutually bonding is an overall structure, finishes by prefabrication production; It is 30mm (being the length of FRP muscle) that transition region thickness is strengthened in the anchoring of FRP muscle.
2) the cast strength grade forms reinforced concrete structure layer 1 greater than the high performance concrete of C50 to reinforcing cage upper surface in the reinforced concrete segment punching block, and it is vibrated and surface evening.
3) then on reinforced concrete structure layer 1, adopt pumping technology evenly to build high impervious topping concrete material, form high impervious topping 2, insert simultaneously and smash and surface evening to the punching block surface.
Described strength grade all adopts prior art greater than high performance concrete and the impervious topping concrete material of described height of C50.
Described strength grade is mainly mixed by raw materials such as cement, flyash, sand, stone, high efficiency water reducing agent, water greater than the high performance concrete of C50, and the shared parts by weight of each raw material are: 1.00 parts of cement, 0.20～0.30 part in flyash (I level), 1.60～1.90 parts in sand, 1.00～1.30 parts of the handstones of particle diameter 4.75～9.5mm, the big stone 1.60～2.00 of particle diameter 4.75～26.5mm, 0.01～0.02 part of high efficiency water reducing agent, 0.30～0.40 part in water.
The impervious topping concrete material of described height is that diffusion coefficient is less than 3.0 * 10
-13m
2/ s, cracking resistance grade reach I level, the strength grade high-performance fine aggregate concrete between C100～C200.The high-performance fine aggregate concrete is mainly mixed by cement, water, hardening agent and the particle diameter fine aggregate raw material less than 0.63mm, and the shared parts by weight of each raw material are: 1.00 parts of cement, 0.16～0.22 part in water, 0.40～0.75 part of hardening agent, particle diameter are less than 1.00～1.40 parts of the fine aggregates of 0.63mm.Described hardening agent mainly by specific area greater than 200000cm
2The high activity SiO of/g
2Micro mist, specific area are greater than 4000cm
2Little breeze of the high activity of/g or flyash, assorted fibre and economization agent raw material mix, and the shared parts by weight of each raw material are: specific area is greater than 200000cm
2The high activity SiO of/g
21.00 parts of micro mists, specific area are greater than 4000cm
21.50～3.00 parts in little breeze of the high activity of/g or flyash, 0.01～0.02 part of assorted fibre, 0.08～0.15 part of economization agent.
The adhesion strength and the shear strength of the functional gradient material interface floor of chamber experimental test shield duct piece by experiment, experimental result is shown in table 1, table 2.The result shows that by the reinforcement of FRP muscle, the performance of functional gradient material interface is improved significantly, 28d boundary layer adhesion strength 〉=5.0MPa (pressing the test of split tensile strength experimental technique); 28d boundary layer shear strength 〉=10.0MPa.And the forming process of the functional gradient material interface by on-the-spot shield duct piece and long-term observation, the functional gradient material interface of shield duct piece is not found breakoff phenomenons such as cracking, slippage.
The functional gradient material interface adhesion strength test of table 1 shield duct piece
Annotate: 11h is steam-cured demould time.
The functional gradient material interface shear strength test of table 2 shield duct piece
Embodiment 2:
As Fig. 1, Fig. 2, shown in Figure 3, a kind of technology of utilizing the functional gradient material interface of FRP rigidity of soft tissues shield duct piece, it comprises the steps:
1) set up the anchoring of FRP muscle and strengthen transition region: FRP muscle external surface is a thread structure, diameter 10mm, and length 20mm, the distribution of FRP muscle on grid cloth distributes by lattice-like, and the spacing between the two adjacent FRP muscle is: 50mm.
Before the concrete pouring, lay and sticking flexible FRP grid cloth 5 on the surface of reinforcing cage 4 in the reinforced concrete segment punching block, press dot matrix distribution of shapes FRP muscle 3 on the flexible FRP grid cloth 5, form the anchoring of FRP muscle and strengthen transition region, wherein FRP muscle 3 and FRP grid cloth 5 are mutually bonding is an overall structure, finishes by prefabrication production; It is 20mm (being the length of FRP muscle) that transition region thickness is strengthened in the anchoring of FRP muscle.
2) the cast strength grade forms reinforced concrete structure layer 1 greater than the high performance concrete of C50 to reinforcing cage upper surface in the reinforced concrete segment punching block, and it is vibrated and surface evening.
3) then on reinforced concrete structure layer 1, adopt pumping technology evenly to build high impervious topping concrete material, form high impervious topping 2, insert simultaneously and smash and surface evening to the punching block surface.
Embodiment 3:
As Fig. 1, Fig. 2, shown in Figure 3, a kind of technology of utilizing the functional gradient material interface of FRP rigidity of soft tissues shield duct piece, it comprises the steps:
1) set up the anchoring of FRP muscle and strengthen transition region: FRP muscle external surface is a thread structure, diameter 30mm, and length 40mm, the distribution of FRP muscle on grid cloth distributes by lattice-like, and the spacing between the two adjacent FRP muscle is: 90mm.
Before the concrete pouring, lay and sticking flexible FRP grid cloth 5 on the surface of reinforcing cage 4 in the reinforced concrete segment punching block, press dot matrix distribution of shapes FRP muscle 3 on the flexible FRP grid cloth 5, form the anchoring of FRP muscle and strengthen transition region, wherein FRP muscle 3 and FRP grid cloth 5 are mutually bonding is an overall structure, finishes by prefabrication production; It is 40mm (being the length of FRP muscle) that transition region thickness is strengthened in the anchoring of FRP muscle.
2) the cast strength grade forms reinforced concrete structure layer 1 greater than the high performance concrete of C50 to reinforcing cage upper surface in the reinforced concrete segment punching block, and it is vibrated and surface evening;
3) then on reinforced concrete structure layer 1, adopt pumping technology evenly to build high impervious topping concrete material, form high impervious topping 2, insert simultaneously and smash and surface evening to the punching block surface.
Claims (2)
1. technology of utilizing the functional gradient material interface of FRP rigidity of soft tissues shield duct piece, it is characterized in that: it comprises the steps:
1) set up the anchoring of FRP muscle and strengthen transition region: the surface of reinforcing cage in the reinforced concrete segment punching block (4) goes up lays and sticking flexible FRP grid cloth (5), flexible FRP grid cloth (5) goes up presses dot matrix distribution of shapes FRP muscle (3), form the anchoring of FRP muscle and strengthen transition region, wherein FRP muscle (3) is mutually bonding with FRP grid cloth (5) is an overall structure;
2) the cast strength grade forms reinforced concrete structure layer (1) greater than the high performance concrete of C50 to reinforcing cage upper surface in the reinforced concrete segment punching block;
3) then go up the employing pumping technology and build high impervious topping concrete material, form high impervious topping (2) to the punching block surface at reinforced concrete structure layer (1).
2. a kind of technology of utilizing the functional gradient material interface of FRP rigidity of soft tissues shield duct piece according to claim 1, it is characterized in that: described FRP muscle external surface is a thread structure, diameter 10mm～30mm, length 20mm～40mm, the spacing between the two adjacent FRP muscle is: 50mm～90mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101244827A CN100464056C (en) | 2006-09-08 | 2006-09-08 | Technique for strengthening boundary face of functional gradient material of shield duct piece by using FRP rib |
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|---|---|---|---|
| CNB2006101244827A CN100464056C (en) | 2006-09-08 | 2006-09-08 | Technique for strengthening boundary face of functional gradient material of shield duct piece by using FRP rib |
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| CN1916365A CN1916365A (en) | 2007-02-21 |
| CN100464056C true CN100464056C (en) | 2009-02-25 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103205755A (en) * | 2013-04-16 | 2013-07-17 | 深圳大学 | Cathode protection method and cathode protection device for reinforced concrete adopting CFRP (carbon fibre reinforced plastics) embedded anode |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2921643B1 (en) * | 2014-03-21 | 2020-07-22 | Herrenknecht AG | Protection element, concrete element, and method for producing a concrete element |
| JP6613714B2 (en) * | 2015-08-24 | 2019-12-04 | 株式会社大林組 | Segment manufacturing method |
| CN114474780B (en) * | 2020-10-26 | 2023-12-12 | 北京市政建设集团有限责任公司 | Sandwich plate type shield tunnel segment anti-collision energy absorbing device and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3801603A1 (en) * | 1988-01-21 | 1989-07-27 | Guenter Weidenschlager | Process for producing composites comprising a layer of natural stone and a reinforcing layer |
| JP2006009266A (en) * | 2004-06-22 | 2006-01-12 | Nippon Steel Composite Co Ltd | Concrete exfoliation preventive method |
| CN2804229Y (en) * | 2005-05-31 | 2006-08-09 | 南京工业大学 | Reinforced building structural compound wooden member |
-
2006
- 2006-09-08 CN CNB2006101244827A patent/CN100464056C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3801603A1 (en) * | 1988-01-21 | 1989-07-27 | Guenter Weidenschlager | Process for producing composites comprising a layer of natural stone and a reinforcing layer |
| JP2006009266A (en) * | 2004-06-22 | 2006-01-12 | Nippon Steel Composite Co Ltd | Concrete exfoliation preventive method |
| CN2804229Y (en) * | 2005-05-31 | 2006-08-09 | 南京工业大学 | Reinforced building structural compound wooden member |
Non-Patent Citations (4)
| Title |
|---|
| FRP复合材料在国外土木工程中的应用 . 周长东，黄承逵.建筑技术，第33卷第11期. 2002 |
| FRP复合材料在国外土木工程中的应用 . 周长东，黄承逵.建筑技术，第33卷第11期. 2002 * |
| 纤维聚合物增强筋在土木工程中的应用. 范伟.广州建筑，第4期. 2003 |
| 纤维聚合物增强筋在土木工程中的应用. 范伟.广州建筑，第4期. 2003 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103205755A (en) * | 2013-04-16 | 2013-07-17 | 深圳大学 | Cathode protection method and cathode protection device for reinforced concrete adopting CFRP (carbon fibre reinforced plastics) embedded anode |
| CN103205755B (en) * | 2013-04-16 | 2015-11-18 | 深圳大学 | CFRP is adopted to embed protecting reinforced concrete cathode method and the device of anode |
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| CN1916365A (en) | 2007-02-21 |
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