CN103967205A - FRP (Fiber Reinforced Polymer) pipe-recycled concrete-steel pipe double-walled hollow combined member - Google Patents
FRP (Fiber Reinforced Polymer) pipe-recycled concrete-steel pipe double-walled hollow combined member Download PDFInfo
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Abstract
The invention discloses an FRP (Fiber Reinforced Polymer) pipe-recycled concrete-steel pipe double-walled hollow combined member. The combined member comprises three parts, namely an outer FRP pipe, an inner steel pipe and recycled aggregate concrete arranged between the outer FRP pipe and the inner steel pipe; the combined member improves the compressive strength and the deformability of the recycled aggregate concrete, thereby improving the overall bearing capacity and the ductility of the member, and reducing the adverse impact on the creep of the member; since the recycled aggregate concrete is wrapped with the corrosion resistant FRP pipe, the instability in durability aspect and other defects of the recycled aggregate concrete are overcome; the hollow combined member is an environment-friendly combined member which is favorable in anti-seismic property and mechanical property, light in dead weight, high in durability, wide in applicability, convenient to construct, reasonable in cost, attractive in appearance, and practical, and has a relatively high popularization value.
Description
Technical field
The invention belongs to Structural Engineering field, be specifically related to a kind of FRP pipe-regeneration concrete-steel pipe double-walled hollow combination member.
Background technology
Fibre reinforced composites (Fiber Reinforced Polymer, be called for short FRP) have been widely used in the maintenance and reinforcement of old structure because of its lightweight, high-strength, corrosion resistant feature, and start to apply in newly-built structure.In combined member of the present invention, FRP pipe provides circumference stress constraint to concrete, make concrete there is good ductility, the outside distortion Constrained effect of FRP pipe and the steel pipe of concrete to internal layer, makes steel pipe not have the problem of pressurized flexing simultaneously, and the co-operation of combined member is functional.Meanwhile, FRP material because of its decay resistance strong, can effectively protect steel pipe and restrained concrete, improved durability and the application life of this new structural members.
Steel pipe is as traditional building material, applied range.Steel pipe in combined member of the present invention can effectively support construction stage load, can adopt the node technology of existing steel core concrete column, by the steel pipe of internal layer, makes this Novel pole and beam be easy to be connected.The steel pipe of internal layer together with outer field FRP pipe, can be in the construction stage masterplate as concreting, not only easy construction can also be saved masterplate expense.If desired can be at steel duct gap fill concrete, to improve member integrated stress performance (resistance to compression and bending resistance).
Regenerated aggregate concrete is to operations such as a series of fragmentations of waste and old concrete process, screening, cleanings, recycles, and partly or entirely substitutes the concrete using as concrete aggregate.Along with the continuous propelling of Chinese Urbanization, build former raw aggregate source day by day exhausted, effectively reclaim waste and old concrete and can reuse building material, can save solid refuse landfill land used simultaneously, reduce environment pollution, not only there is economic implications, also there is important social effect and the value of environmental protection.Because surface property and the natural aggregate of regeneration aggregate have larger difference, the porosity of regeneration aggregate and water absorption rate are than the oneself factor such as natural aggregate is large, and the durability of regenerated aggregate concrete decreases compared with ordinary concrete.On the other hand, under identical match ratio condition, the intensity of regenerated aggregate concrete and deformability are a little less than ordinary concrete.Thereby regenerated aggregate concrete separately the level of application is lower, scope is narrower, is mainly used in the non-stress such as highway construction, building-block or stressed less structure in Practical Project, or as the packing material of supplementary structure.Adopt FRP pipe-regeneration concrete-steel pipe double-walled hollow combination member, not only can give full play to the good characteristic of traditional steel and new type FRP material, can also improve concrete stress performance and durability, thereby can utilize fully, efficiently regenerated aggregate concrete, promote the application of regenerated aggregate concrete in force structure, reach the effect turning waste into wealth, provide an effective approach for realizing discarded concrete resource.
Above-mentioned discussion content object is to introduce and may, with below by the Related Technical Issues of the present invention that is described and/or advocates, contributes to understand better various aspects of the present invention.Therefore, should be appreciated that reading these with this angle discusses, instead of admit prior art.
Summary of the invention
The object of the invention is: the deficiency of improving existing regenerated aggregate concrete stress performance and durability aspect, a kind of FRP pipe-regeneration concrete-steel pipe double-walled hollow combination member is provided, this combined member has improved compressive strength and the deformability of regenerated aggregate concrete, thereby improve member integrated bearing capacity and ductility, reduce the adverse effect that member is crept; Because regenerated aggregate concrete is wrapped up by corrosion resistant FRP pipe, overcome unstability and other deficiency of regenerated aggregate concrete aspect durability.This member can be given full play to the mechanical characteristic of steel and FRP pipe, and combined effect is obvious, makes this member have good anti-seismic performance and ductility.Meanwhile, built-in steel pipe and external FRP pipe can be used as the masterplate of concreting, the reduction of erection time, save masterplate expense.
A kind of FRP pipe-regeneration concrete-steel pipe double-walled hollow combination member provided by the invention, by outer field FRP pipe 1, the steel pipe 2 of internal layer, and regenerated aggregate concrete 3 three parts compositions between two-layer.
Described FRP pipe 1 overlaps or overlaps after translation with longitudinal center's axis of steel pipe 2.
Described FRP pipe 1 and steel pipe 2 are straight tube or are bend pipe.
Described FRP pipe 1 and steel pipe 2 are uniform section or variable cross-section along its length.
The cross sectional shape of described FRP pipe 1 includes but not limited to circle, ellipse, the square with lead angle, the rectangle with lead angle or other polygon with lead angle.
The cross sectional shape of described steel pipe 2 includes but not limited to as circle, ellipse, the square with lead angle, the rectangle with lead angle or other polygon with lead angle.
Described FRP pipe 1 adopts the FRP material of the different kinds of fibers of carbon fiber, basalt fibre, aramid fiber or glass fiber, according to the structural specifications of longitudinal stress member in reinforced concrete structural element, the sectional area of FRP pipe 1 account for combined member gross section long-pending 0.6 ~ 5%.
Described FRP pipe 1 is FRP profile material tube or is directly wound around the cloth that sticks on regenerated aggregate concrete external surface.
Described regenerated aggregate concrete 3 comprises containing the regenerated coarse aggregate of different substitution rates, recycled fine aggregate or regeneration coarse-fine aggregate by the concrete of different mixture ratio preparation.
When FRP pipe-regeneration concrete-steel pipe double-walled hollow combination member is during as beam-type member, the position of steel pipe can be near tensile region.It may be noted that, the new structural members forming for the pipe of placing with one heart by two, in the time may there is tensile region in a big way in member, in member, configurable certain longitudinal reinforcement or FRP muscle are to prevent excessive draw crack.
A kind of FRP pipe-regeneration concrete-steel pipe double-walled hollow combination member of the present invention, by outer field FRP (Fiber Reinforced Polymer, fibre reinforced composites) pipe, the steel pipe of internal layer, and middle regenerated aggregate concrete three parts compositions, have good ductility and anti-seismic performance and corrosion-resistant, from the combining structure member of heavy and light, easy construction and environmental protection.FRP used in the present invention manages related fiber type, can be according to member stress, environment for use and cost requirement, and choose reasonable is as carbon fiber, basalt fibre, aramid fiber or glass fiber.
According to the different situations of outer field FRP pipe, the present invention can take following two kinds of different making steps:
The concrete making step of scheme one is as follows:
(1) steel pipe is carried out type selecting and determines the outer peripheral shape of template of member;
(2) steel pipe is inserted in to template, and same one end of sealing steel pipe and template;
(3) regenerated aggregate concrete is built between steel pipe and template, and carry out maintenance;
(4) after maintenance completes, stripping;
(5) in member outer felt around pasting FRP material, the number of plies should meet instructions for use, and makes it be wrapped in member outside.
The concrete making step of scheme two is as follows:
(1) steel pipe and FRP pipe are carried out to type selecting;
(2) steel pipe is inserted in to outer field FRP pipe, and same one end of sealing steel pipe and FRP pipe;
(3) regenerated aggregate concrete is built between FRP pipe and steel pipe, after carrying out maintenance and completing without form removal.
Beneficial effect of the present invention:
(1) deadweight is lighter.This combined member adopts the FRP material of lightweight, and its quality is generally only 20% of same intensity steel; The space of steel duct has alleviated dead load effectively simultaneously.
(2) mechanical property is superior.The outside distortion of steel pipe is by concrete and the operative constraint of FRP pipe, and outer field FRP pipe mainly comprises hoop fiber, does not have buckling problem; The steel pipe of outer field FRP pipe and internal layer plays effect of contraction to middle regenerated aggregate concrete, make core regenerated aggregate concrete in three dimension stress state, thereby improve compressive strength and the deformability of core regenerated aggregate concrete, and improve the overall ductility of member.Can recognize by experimental data: for the combined member of different FRP thickness, its bearing capacity improves along with the increase of the outsourcing FRP number of plies, and the amplitude improving is also more obvious, even improve 58% than corresponding concrete and the independent bearing capacity sum of steel pipe, the ductility that ductility ratio is filled the concrete same kind member of general aggregate improves 61%.
(3) applied range.The regenerated aggregate concrete of interior filling, in three-dimensional restrained condition, makes member have good ductility and anti-seismic performance, thereby this member has broad application prospects having in the building in requirements for fortification against earthquake area and bridge construction; Simultaneously; utilize the regenerated aggregate concrete of FRP protection of pipe inside and steel pipe to avoid the erosion of external environment condition, improve the durability of member, therefore; this combined member is also specially adapted to outdoor structure, as bending component in bridge pier, stake, beam or other erosion environment condition etc.
(4) utilize waste and save energy.China reaches more than 300,000,000 tons because of the solid waste of removing building and new building generation every year, and wherein 50～60% is discarded concrete; Only Guangzhou building castoff average year generation reaches 4,000 ten thousand tons.And current utilization rate is less than 2.5%.This new structural members, can improve largely recycling of building castoff, and can effectively improve the limitation of regenerated aggregate concrete self application, promote the application and development of regenerated aggregate concrete in force structure, thereby for discarded concrete recycling provides an effective approach, meet the requirement of sustainable development.
(5) be convenient to line arrangement.While use in building structure, the space that this combined member steel duct exists, is convenient to lay pipeline and arranges circuit, has not only increased usable floor area, and has beautified architectural appearance, improves the safety and the cleaning that affect building because of line arrangement.
(6) easy construction, cost are low.FRP pipe and steel pipe can be used as the template of concreting while construction, thereby have avoided the operation of conventional concrete structure fabrication template and form removal, reduce construction period; From the angle of cost, although the initial expenditure of construction of this double-walled hollow combination member is slightly high, as consider later maintenance cost and service condition, this double-walled hollow pipe column has more advantage in the economy of life cycle management.
In sum FRP pipe-regeneration concrete-steel pipe double-walled hollow combination member be a kind of antidetonation and stress performance good, from heavy and light, good endurance, applicability extensively, easy construction, reasonable, the both artistic and practical environment-friendly type combined member of cost.
Brief description of the drawings
Combined member of the present invention: the level cross-sectionn figure of FRP pipe-regeneration concrete-steel pipe double-walled hollow combination member is as follows.
Fig. 1 is the typical section form schematic diagram of combined member of the present invention;
Fig. 2 is that the outer field FRP pipe of combined member of the present invention is the square pipe with lead angle, the section form schematic diagram that the steel pipe of internal layer is pipe;
Fig. 3 is that the steel pipe of the outer field FRP pipe of combined member of the present invention and internal layer is the foursquare section form schematic diagram with lead angle;
Fig. 4 is the section form schematic diagram of combined member of the present invention as flexural member.
Number in the figure explanation: 1-regenerated aggregate concrete; 2-FRP pipe; 3-steel pipe.
detailed description of the invention:
In order to make those skilled in the art understand better technical scheme of the present invention, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail, it should be noted that, in the situation that not conflicting, the feature in the application's embodiment and embodiment can combine mutually.
The present embodiment is selected the typical section form of this combined member, and the steel pipe of internal layer is circular, and outer field FRP pipe is also circular.Combined member size, comprises that the diameter of inner and outer pipes, thickness need to need to determine according to actual carrying capacity.This example center pillar height is 300mm, and diameter is 150mm; The thickness of steel pipe is 3.5mm, and external diameter is 72mm; Outer tube adopts GFRP cloth, and thickness is 0.177mm, and the number of plies is 1 layer, adopts wet sticky method to be wound around and sticks on regenerated aggregate concrete external surface.Regenerated aggregate concrete need to be prepared in laboratory.For example, by " JGJ_55-2011_ design of common concrete proportioning code ", C35 ordinary concrete design mixture proportion is cement: sand: stone: water=399:619:1177:215, because required concrete strength is not high, does not add Admixture.Regeneration aggregate is the finished industrial product that environmental protection company produces, and is that former discarded concrete is carried out to simple crushing gained.Recording general aggregate density is 1459.1kg/m
3, regeneration aggregate density is 1391.8kg/m
3.Common coarse aggregate is 5～20mm rubble; Fines is common river sand, and fineness modulus is 2.9, belongs to medium sand; Cement strength is PO 42.5 early-strength cement; Water is tap water.Regeneration aggregate carries out equal-volume to concrete coarse aggregate and substitutes corresponding common coarse aggregate, design regeneration aggregate substitution rate 30%, 50%, 70% and 100%.In regenerated aggregate concrete, all identical with ordinary concrete of cement, sand, water consumption, every cubic metre of consumption is respectively 399kg, 619kg, 215kg, and for concrete coarse aggregate (stone), every cubic metre of consumption of regeneration concrete (general aggregate: regeneration aggregate) of substitution rate 30%, 50%, 70% and 100% is followed successively by: 824:337; 589:561; 353:786 and 0:1123.
In the time that outer tube is selected cloth, selection scheme one is made combined member: first make member outward flange template with pvc pipe and plank, round steel pipe is put in to PVC cylinder template center, and is fixed on plank; Carry out regenerated aggregate concrete by the different regeneration aggregate substitution rates of design and build between steel pipe and template, and maintenance on request; After maintenance completes, remove PVC template; According to force request and environment for use requirement, select suitable FRP cloth kind (as carbon fiber, basalt fibre, aramid fiber or glass fiber) and the number of plies.Treat that epoxy resin parches completely, this combined member just can be brought into play building structure effect.
Finally explanation is, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not departing from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (9)
1. FRP pipe-regeneration concrete-steel pipe double-walled hollow combination member, is characterized in that: by outer field FRP pipe (1), and the steel pipe (2) of internal layer, and regenerated aggregate concrete (3) three parts compositions between two-layer.
2. double-walled hollow combination member according to claim 1, is characterized in that: described FRP pipe (1) overlaps or overlaps after translation with longitudinal center's axis of steel pipe (2).
3. double-walled hollow combination member according to claim 1, is characterized in that: described FRP pipe (1) and steel pipe (2) are straight tube or are bend pipe.
4. double-walled hollow combination member according to claim 1, is characterized in that: described FRP pipe (1) and steel pipe (2) are uniform section or variable cross-section along its length.
5. double-walled hollow combination member according to claim 1, is characterized in that: the cross sectional shape of described FRP pipe (1) includes but not limited to circle, ellipse, the square with lead angle, the rectangle with lead angle or other polygon with lead angle.
6. double-walled hollow combination member according to claim 1, is characterized in that: the cross sectional shape of described steel pipe (2) includes but not limited to as circle, ellipse, the square with lead angle, the rectangle with lead angle or other polygon with lead angle.
7. double-walled hollow combination member according to claim 1, is characterized in that: described FRP pipe (1) adopts the FRP material of the different kinds of fibers of carbon fiber, basalt fibre, aramid fiber or glass fiber; The sectional area of FRP pipe (1) account for combined member gross section long-pending 0.6 ~ 5%.
8. double-walled hollow combination member according to claim 1, is characterized in that: described FRP pipe (1) is FRP profile material tube or is directly wound around the cloth that sticks on regenerated aggregate concrete external surface.
9. double-walled hollow combination member according to claim 1, is characterized in that: described regenerated aggregate concrete (3) comprises containing the regenerated coarse aggregate of different substitution rates, recycled fine aggregate or regeneration coarse-fine aggregate by the concrete of different mixture ratio preparation.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410192231.7A CN103967205A (en) | 2014-05-08 | 2014-05-08 | FRP (Fiber Reinforced Polymer) pipe-recycled concrete-steel pipe double-walled hollow combined member |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410192231.7A CN103967205A (en) | 2014-05-08 | 2014-05-08 | FRP (Fiber Reinforced Polymer) pipe-recycled concrete-steel pipe double-walled hollow combined member |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104563390A (en) * | 2015-01-21 | 2015-04-29 | 广东工业大学 | FRP (fiber reinforce plastic) tube-concrete-multiple steel tube hollow combined single-box or multi-box multi-compartment beam |
| CN104746799A (en) * | 2015-01-27 | 2015-07-01 | 清华大学 | Steel, FRP and environment-friendly concrete combined column and building method thereof |
| CN105003027A (en) * | 2015-07-29 | 2015-10-28 | 温州大学 | FRP restrained pipe regenerated mixed concrete combination column |
| CN108118692A (en) * | 2017-12-29 | 2018-06-05 | 广东工业大学 | Fibre reinforced composites regenerate masonry aggregate concrete hollow steel pipe pile |
| CN108360744A (en) * | 2018-02-11 | 2018-08-03 | 广东工业大学 | A kind of structural column |
| CN109910166A (en) * | 2019-03-01 | 2019-06-21 | 南京工程学院 | Improve the structure and preparation method thereof of FRP pipe and fiber concrete combination interface |
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| CN105003027A (en) * | 2015-07-29 | 2015-10-28 | 温州大学 | FRP restrained pipe regenerated mixed concrete combination column |
| CN108118692A (en) * | 2017-12-29 | 2018-06-05 | 广东工业大学 | Fibre reinforced composites regenerate masonry aggregate concrete hollow steel pipe pile |
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| CN109910166A (en) * | 2019-03-01 | 2019-06-21 | 南京工程学院 | Improve the structure and preparation method thereof of FRP pipe and fiber concrete combination interface |
| CN110408940A (en) * | 2019-09-12 | 2019-11-05 | 深圳大学 | CFRP- steel concrete combined member cathode protection device and preparation method thereof |
| CN110408940B (en) * | 2019-09-12 | 2021-10-15 | 深圳大学 | CFRP-steel concrete combined member cathode protection device and preparation method thereof |
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