CN106284400A

CN106284400A - A kind of prestressed concrete Wind turbines basis

Info

Publication number: CN106284400A
Application number: CN201610827805.2A
Authority: CN
Inventors: 孙杏建; 陈法波; 薛竣中; 许维强
Original assignee: PowerChina Huadong Engineering Corp Ltd
Current assignee: PowerChina Huadong Engineering Corp Ltd
Priority date: 2016-09-18
Filing date: 2016-09-18
Publication date: 2017-01-04
Anticipated expiration: 2036-09-18
Also published as: CN106284400B

Abstract

The present invention relates to a kind of prestressed concrete Wind turbines basis.It is an object of the invention to provide a kind of prestressed concrete Wind turbines basis, it is intended to be effective against the shearing force between blower foundation ring and concrete foundation and punching press, power is diffused into more peripheral concrete region simultaneously, effectively solve the neutralization coagulation drawing crack of blower foundation ring periphery concrete stress collection and break the problems such as bad with pressure, it is achieved the target that prestressing force loads.The technical scheme is that a kind of prestressed concrete Wind turbines basis, there is concrete foundation, the reinforcement foundation being embedded in basis, be embedded in the blower foundation ring at top, basis and be welded on the flange in the bottom bottom blower foundation ring, it is characterized in that: in concrete foundation, the periphery of blower foundation ring grouting steel loop is set, grouting steel loop is preset grout pipe skirt to outside basis.The present invention is applicable to subsoil concrete foundation and the pile foundation concrete bearing platform etc. in wind power foundation Structural Engineering field.

Description

A kind of prestressed concrete Wind turbines basis

Technical field

The present invention relates to a kind of prestressed concrete Wind turbines basis.It is applicable to wind power foundation Structural Engineering field Subsoil concrete foundation and pile foundation concrete bearing platform etc..

Background technology

Wind turbines foundation ring is to connect pylon and the principal mode on basis at present, bears and transmits huge bending moment.As The directive document of Wind turbines basic engineering, " Wind turbines Base foundation design regulation " be not to blower foundation ring and basis Connect design computational analysis and make detailed regulation.Itself there is lacking of congenital defect in the version of Wind turbines foundation ring The anti-fatigue performance of point, i.e. foundation ring is good, and base concrete fatigue effect is little, and the concrete of foundation ring periphery is at fatigue load It is easily generated crack under repeated action.Especially under extreme loading condition, basis local stress is obviously improved, foundation ring and concrete Between cohesive force gradually lose, cause the plane of fracture of foundation ring periphery concrete progressively to expand, coagulation at the coarse plane of fracture Soil is constantly worn down to powder particle, and the water body penetrated in basis will be gradually filled with whole plane of fracture space, and powder particle will be with The form of mortar is constantly extruded the plane of fracture, is extruded basis further along the gap passage between foundation ring and basis, thus makes Become a range of concrete of flange at the bottom of foundation ring gradually to be emptied, and then form cavity, be unfavorable for the steady of foundation ring Fixed, thus cause running of wind generating set produces and acutely rock.Once there is the problems referred to above and phenomenon in blower foundation, typically takes Bored grouting is strengthened and the treatment measures of water sealing structure of reforming, but is still difficult to permanently effective solution.

Therefore, blower foundation is needed badly to foundation ring Shi Hanzhang when design, reduces blower foundation when fan operation The fatigue produced and stress concentration phenomenon, but reality implements extremely difficult, technical difficulty is big, and construction requirement is high.

Summary of the invention

The technical problem to be solved in the present invention is: for the problem of above-mentioned existence, it is provided that a kind of prestressed concrete wind-powered electricity generation Crew base, it is intended to be effective against the shearing force between blower foundation ring and concrete foundation and punching press, power be diffused into more simultaneously Peripheral concrete region, effectively solves blower foundation ring periphery concrete stress collection and neutralizes coagulation drawing crack and pressure and break and badly etc. ask Topic, it is achieved the target that prestressing force loads.

The technical solution adopted in the present invention is: a kind of prestressed concrete Wind turbines basis, have concrete foundation, The reinforcement foundation that is embedded in basis, it is embedded in the blower foundation ring at top, basis and is welded on the bottom bottom blower foundation ring Flange, it is characterised in that: in concrete foundation, the periphery of blower foundation ring grouting steel loop is set, grouting steel loop is preset filling Slurry pipe skirt are to outside basis.

Described grouting steel loop has some circles, is fixed on inside the steel reinforcement cage set up by reinforcement foundation, the grouting steel loop of inner ring Keep setting spacing with blower foundation ring.

Described grouting steel loop cross section be two ends be arc-shaped, middle in flat, intermediate formation cavity.

The grouting steel loop of described inner ring includes below grouting steel loop that blower foundation ring outside upright arranges or flange in the bottom Horizontally disposed grouting steel loop or use above-mentioned vertically and level arranges the structure of grouting steel loop simultaneously.

The quantity of described grout pipe 2, one is high-pressure slip-casting pipe, and remaining is exhaustor.

The invention has the beneficial effects as follows: 1, the present invention both can be applicable to land wind-powered electricity generation, is equally applicable for offshore wind farm；2, originally Invent reasonable in design, grouting steel loop is set inside concrete foundation, make it expand prestretching by high-pressure slip-casting in steel loop body Mode, grouting steel loop upper and lower side ensures not to be destroyed, and middle expansion by high pressure during grouting body perfusion heaves prestretching, for blower fan Foundation ring periphery concrete provides prestressing force, it is possible to be effective against the shearing force between blower foundation ring and concrete foundation and punching Pressure, is diffused into more peripheral concrete region simultaneously by power, efficiently solves foundation ring periphery concrete stress collection and neutralizes coagulation Drawing crack and pressure break the problems such as bad；3, in the present invention, key component grouting steel loop can shift to an earlier date big batch in steel construction processing factory Prefabricated, be conducive to saving the duration, high construction efficiency is feasible；4, the present invention uses grouting steel loop flexibly, can be around blower foundation ring Place multiple tracks, be greatly enhanced underlying strength, be conducive to increasing the service life.

Accompanying drawing explanation

Fig. 1 is the elevation of the present invention.

Fig. 2 is the partial enlarged drawing of Fig. 1.

Detailed description of the invention

As shown in Figure 1 and Figure 2, the present embodiment is a kind of prestressed concrete Wind turbines basis, have concrete foundation 6, The reinforcement foundation 4 that is embedded in basis, it is embedded in the blower foundation ring 5 at top, basis and is welded on the end bottom blower foundation ring Portion's flange 7, in concrete foundation 6, the periphery of blower foundation ring 5 arrange some circle grouting steel loop 2, grouting steel loop on preset fill Slurry pipe 1 skirt are to outside basis.Grouting steel loop 2 cross section be two ends be arc-shaped, middle in flat, intermediate formation cavity. Grouting steel loop is fixed on inside the steel reinforcement cage set up by reinforcement foundation 4, and the grouting steel loop 2 of inner ring should keep with blower foundation ring 5 Set spacing.The grouting steel loop 2 of inner ring includes below grouting steel loop 2 that blower foundation ring 5 outside upright arranges or flange in the bottom 7 Horizontally disposed grouting steel loop 2 or simultaneously use grouting steel loop 2 vertically and horizontally.

In the present embodiment, the quantity of grout pipe 1 is 2, and one is high-pressure slip-casting pipe, and another is exhaustor, grout pipe 1 Stock inlet distance concrete foundation end face about 170mm.The prefabricated height of steel construction processing factory be 320mm, width be 80mm, thickness of slab For the grouting steel loop 2 of 5mm, and carry out splicing at the scene and be welded into entirety, arrange inside the steel reinforcement cage that reinforcement foundation 4 is set up in advance Fixing, multi-turn can be set as required, grouting steel loop 2 and the blower foundation ring 5 of inner ring to keep a determining deviation, and this example takes 200mm. After concrete foundation 6 pours maintenance 7 days, by grout pipe 1, grouting steel loop 2 inside of ring-type welding is carried out high-pressure grouting, fill Slurry 3 should ensure that certain pressure when irrigating, pressure is about 10MPa, and grouting steel loop 2 is internal is full of continuation grouting after grouting body 3 Grout pipe 1 is closed immediately so that it is form an airtight overall structure, then support the same period with blower foundation concrete after certain time Protect to the stipulated time.

The operation principle of the present embodiment: by being filled in the middle of grouting steel loop 2 internal high pressure grouting way, grouting steel loop 2 High pressure during slurry 3 continuous pouring expands and heaves prestretching, and the concrete foundation 6 for blower foundation ring 5 periphery provides prestressing force, energy Enough it is effective against the shearing force between blower foundation ring 5 and concrete foundation 6 and punching press, power is diffused into more peripheral coagulation simultaneously Soil region, effectively solves the neutralization coagulation drawing crack of blower foundation ring 5 periphery concrete stress collection and breaks the problems such as bad with pressure.

The present invention can strengthen underlying strength by the way of placing multiple tracks grouting steel loop 2 around blower foundation ring 5, has It is beneficial to increase the service life；Additionally, the grouting steel loop 2 of the present invention and grout pipe 1 can be the most prefabricated in steel construction processing factory, favorably In improving efficiency of construction, save the duration.

Claims

1. a prestressed concrete Wind turbines basis, the reinforcement foundation there is concrete foundation (6), being embedded in basis (4), being embedded in the blower foundation ring (5) at top, basis and be welded on the flange in the bottom (7) bottom blower foundation ring, its feature exists In: in concrete foundation (6), the periphery of blower foundation ring (5) arrange grouting steel loop (2), grouting steel loop on preset grout pipe And skirt is to outside basis (1).

Prestressed concrete Wind turbines the most according to claim 1 basis, it is characterised in that: described grouting steel loop (2) There are some circles, are fixed on inside the steel reinforcement cage set up by reinforcement foundation (4), the grouting steel loop (2) of inner ring and blower foundation ring (5) Keep setting spacing.

Prestressed concrete Wind turbines the most according to claim 2 basis, it is characterised in that: described grouting steel loop (2) Cross section be two ends be arc-shaped, middle in flat, intermediate formation cavity.

Prestressed concrete Wind turbines the most according to claim 2 basis, it is characterised in that: the grouting steel of described inner ring Ring (2) includes grouting steel loop (2) that blower foundation ring (5) outside upright arranges or the filling that flange in the bottom (7) lower horizontal is arranged Slurry steel loop (2) or use above-mentioned vertically and level arranges the structure of grouting steel loop (2) simultaneously.

Prestressed concrete Wind turbines the most according to claim 1 basis, it is characterised in that: described grout pipe (1) Quantity 2, one is high-pressure slip-casting pipe, and remaining is exhaustor.