CN103266621A - Steel strand prestress base structure of wind driven generator and construction method thereof - Google Patents

Steel strand prestress base structure of wind driven generator and construction method thereof Download PDF

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Publication number
CN103266621A
CN103266621A CN2013101877976A CN201310187797A CN103266621A CN 103266621 A CN103266621 A CN 103266621A CN 2013101877976 A CN2013101877976 A CN 2013101877976A CN 201310187797 A CN201310187797 A CN 201310187797A CN 103266621 A CN103266621 A CN 103266621A
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steel strand
concrete
bellows
straight hole
wind
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CN103266621B (en
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孟庆波
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BEIJING HUADIAN XINNENG CONSULTATION CO., LTD.
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孟庆波
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Abstract

The invention provides a steel strand prestress base structure for a wind driven generator and a construction method thereof and relates to improvement of the rock layer and soil layer of base structure of the wind driven generator and the construction method thereof. The rock layer of base structure of the wind driven generator is stable and saves raw materials. The base structure comprises a concrete bearing platform, a fixing portion of the wind driven generator is arranged in the middle in the concrete bearing platform, the upper portion of the concrete bearing platform is connected with the bottom of a fan tower through bolts, straight holes are formed in the lower portion of the edge of the concrete bearing platform and evenly distributed on the circumference with the fixing portion as the center, the bottoms of the straight holes are communicated with bottom expanding holes under the straight holes, steel strands are arranged in the straight holes, anchoring portions of the steel strands arranged in the bottom expanding holes are arranged at the bottom ends of the steel strands, bellows are further arranged on the outside of the steel strands, pouring concrete is arranged in places between the bellows and the straight holes and in the bottom expanding holes, concrete is arranged in the bellows and gaps between the steel strands, and the upper ends of the steel strands are fixed on the concrete bearing platform through a location anchoring disc.

Description

A kind of wind-driven generator steel strand prestress foundation structure and job practices thereof
Technical field
The invention belongs to technical field of wind power generation, more particularly, relate to the improvement of a kind of wind-driven generator rock stratum and soil foundation structure, and job practices.
Background technology
Existing wind driven generator base structure is generally following structure: (see figure 9) arranges the taper concrete base about footpath 16~20m, dark 3m always under the face of land, the weight of its concrete base is 40~50t, 400~600m 3 , amount of reinforcement 40~60t; There is the metal ring of a cylindrical tube shape at the middle part of concrete base, and the top of this metal ring is flange, and metal ring top flange and top wind-driven generator tower drum flange fix by bolt, and other parts and the grafting reinforcing bar of metal ring are together imbedded concrete.
The shortcoming of above-mentioned existing structure is: the diameter of its concrete base is 16~20m, need be big at face of land perforated area, and vertical depth 3m is dark, so engineering quantity is bigger; In addition, the weight of concrete base is 40~50t, 400~500m 3 , amount of reinforcement 40~60t, consumable material are very many.
China's utility model patent, the patent No. is: 201120307606.1, name is called: anchor pole basis, the end is expanded in the wind-driven generator weathered rock formation, and it discloses a kind of architecture advances that is positioned at the basis of rock geology wind-driven generator; Comprise that one is positioned at the blower fan flange of blower fan cylindrical shell below, this blower fan flange is connected by bolt with upper flange, the outer rim of described upper flange is joined with the top of connecting cylinder, its structural feature is: the bottom of described connecting cylinder is welded on the lower flange, the diameter of this lower flange outer rim is greater than the external profile diameter of upper flange, described lower flange below, be positioned at one and be furnished with long bolt greater than described upper flange external profile diameter and less than even respectively on the circumference of described upper flange external profile diameter, the bottom of described long bolt is provided with at least two link plates.This structure remain deficiency be: all be fixed on the lower flange of connecting cylinder owing to mainly play the long bolt of resistance to plucking effect, and the size of connecting cylinder is corresponding with the bottom of blower fan cylindrical shell, therefore the load of long bolt is very big, tired easily, as seen the anchor pole foundation structure of this utility model generally is applicable to small-sized wind power generator, and limitation is strong.
Chinese invention patent and for example, the patent No. is: 201010249825.9, name is called: pile anchor rod foundation structure, it discloses a kind of pile anchor rod foundation structure, belong to and be used for fixingly such as main equipments such as frame or pylons in the building construction project, and mainly utilize the technical field of the foundation construction structure that the frame for movement of concrete and rigid material forms.Comprise the circle-shaped equally distributed high-strength grouting post that is of base concrete cylinder cushion cap and extension downwards, by pressure grouting the anchor pole that can penetrate in the described base concrete cylinder cushion cap is arranged fixedly in this high-strength grouting post; The coaxial ring-type finish rolling reinforcing bar that arranges of this base concrete cylinder cushion cap.Adopt this structure can make whole basis bear the huge bending moment that is transmitted by the top tall and slender structure, compare with traditional spread footing, significantly saved the material usage that comprises concrete and steel etc.This structure remain deficiency be: its stretching resistance is not enough, and namely the high strength of this utility model grouting post and anchor pole form a kind of friction pile, but not bearing peg.Be 8m(100m with the diameter 3 ) cushion cap be example, the straight hole degree of depth is 15~20m, it is stressed that every anchor pole needs be 200t(KN), in order to increase anchor pole toughness, the reinforcing bar of common anchor pole need be heat-treated; Yet toughness has increased really, but its anti-impact force reduces greatly; And the disadvantage of this friction pile is through long-term creep, and a certain anchor pole may lose efficacy, and then causes adjacent anchor pole to lose efficacy, and even whole wind generator tower tube is tumbled.
Summary of the invention
The present invention is exactly at the problems referred to above, remedies the deficiencies in the prior art, provide a kind of basis highly stable, save raw-material wind-driven generator rock stratum foundation structure, with and job practices.
For realizing above-mentioned purpose of the present invention, the present invention adopts following technical scheme.
The present invention includes the concrete bearing platform of the cylindrical shape of built-in arrangement of reinforcement, middle part in the concrete bearing platform is provided with the fixed part of wind-driven generator, the top of fixed part links to each other by the bottom of bolt with the wind generator tower tube, its structural feature: have some straight holes below the concrete bearing platform edge, straight hole is distributed on the circumference centered by fixed part; The bottom of straight hole is connected with the expansion bottom outlet of its below, in the straight hole by the steel strand of being formed by some steel wires (under the soil layer geological conditions, can adopt no bonding steel strand), the bottom of steel strand has the anchorage part of steel strand, and anchorage part is arranged at and expands in the bottom outlet; Outside steel strand, also be provided with bellows, concrete for pouring between bellows and straight hole and in the expansion bottom outlet, in the bellows, and be that concrete (expect by preferred employing grouting herein between the space of steel strand, the grouting material is good fluidity, and has high-intensity material after solidifying, as epoxy resin, high grade rubble cement mortar etc.; Under the geological conditions of rock stratum, need back-grouting, under the soil layer geological conditions, only need to the ripple ipe grout); The upper end of steel strand is fixed on the top of concrete bearing platform by the positioning anchor dish.
Particularly, described positioning anchor dish is the metal dish of a cylindrical shape, is provided with grout hole at the center of positioning anchor dish; The through hole of uniform some reverse frustoconics (remove truncated cone with a plane that is parallel to the circular cone bottom surface, the part between bottom surface and the cross section is round platform) centered by grout hole, on the circumference of radius less than the positioning anchor dish, its quantity is corresponding with the quantity of steel strand; Be provided with split type key between the through-hole wall of reverse frustoconic and steel strand, each key is combined to form a rounding platform, and each key is the split that waits of this rounding platform, and the cylinder cambered surface that the key inboard is combined to form is outside corresponding with steel strand; Between the through hole of reverse frustoconic and grout hole, also be provided with a steam vent.In positioning anchor dish of the present invention, described key is two; Its effect is: utilize the structure of its reverse frustoconic, tile, in wrap up in steel strand, be limited in outward in the through hole of reverse frustoconic, make steel strand after bearing uplift force, no longer play is fixed on the positioning anchor dish.
More specifically, the metal embossing that the anchorage part of described steel strand can adopt embossing machine to be pressed into, also can adopt the positioning anchor dish (this positioning anchor dish can no longer arrange grout hole and steam vent) with split type key, the bottom of steel strand is tightened, and place in the expansion bottom outlet.
Described metal embossing can be to disperse to arrange, freely arrange in expanding bottom outlet, also can be from top to bottom, the arrangement mode of alternating expression; The one, prevent the phase mutual interference between the metal embossing, the 2nd, make it to form more stable concrete anchor based structures with concrete, reach better resistance to plucking effect.Therefore, as another kind of preferred version of the present invention, in the bottom centre of described expansion bottom outlet elongated pore is set, the position of this elongated pore is corresponding with straight hole, and the diameter of elongated pore should be less than the diameter of straight hole, and the bottom of bamboo shoot shape stake places in the elongated pore; The stake of bamboo shoot shape can adopt metal or concrete cast to form.The effect of this bamboo shoot shape stake is: utilize its tip that has cambered surface, make the metal embossing of steel strand bottom be evenly distributed in the cambered surface periphery of bamboo shoot shape stake.
Further, described steel strand be 7 steel wires strand coileds one.
As another kind of preferred version of the present invention, grout hole is the screwed hole of M30, and this screwed hole can cooperate with the tube connector of grouting machine, with fixedly connected pipe; Steam vent is the screwed hole of M16, and after the air in the bellows was discharged, the threaded engagement of available bolt and steam vent sealed steam vent, continues to increase grouting pressure.
Described fixed part is the metal ring of a cylindrical shape; Or inverse flange, inverse flange is to be made of upper flange and lower flange, links to each other by bolt between upper flange and lower flange, the top of bolt is fixed on the flange in the bottom in the wind generator tower tube by nut.
The wind-driven generator steel strand prestress foundation structure of the present invention of said structure is under the soil layer geological conditions, because the particularity of soil layer geological conditions, change has taken place corresponding construction technology; Therefore, as a kind of improvement of the present invention, in the work progress, be provided with annular steel form above straight hole, there is the hole corresponding with outside diameter of bel at the center of this annular steel form; In addition, also be provided with the soil layer steam vent on the annular steel form of straight hole top.And, for in soil layer pressure grouting process, prevent that the mud of being discharged by the soil layer steam vent from flowing out from the space of annular steel form and straight hole upper end, can the outer rim below annular steel form arranging highly is that 200~500mm, thickness are the metallic cylinder of 5~10mm, embeds the ground, bottom of foundation ditch.
The job practices of foundation structure of the present invention (rock stratum geological conditions).
(1) digs foundation ditch on the face of land.
(2) in the bottom of foundation ditch along circumference, equidistantly bore some straight holes.
(3) re-use bottom expanding drill equipment, in the reaming of the bottom of straight hole.
(4) bore elongated pore in the bottom of expanding bottom outlet, in elongated pore, put into the stake of bamboo shoot shape.
(5) in each straight hole, put into the steel strand that the bottom has the metal embossing.
(6) outside the steel strand in each straight hole, put bellows, go up to the face of land, down to expanding bottom orifice.
(7) in straight hole, outside the bellows, concrete perfusion.
(8) central authorities at foundation ditch arrange metal ring.
(9) arrangement of reinforcement is installed in foundation ditch.
(10) concrete perfusion in the foundation ditch forms concrete bearing platform.
(11) after concrete strength reaches design strength, the steel strand in bellows are applied prestressing force, with key steel strand are locked on the positioning anchor dish then, the positioning anchor dish is positioned at the concrete bearing platform end face.
(12) again the tube connector of grouting machine is tightened on the grout hole of positioning anchor dish, in bellows, steel strand gap perfusion grouting material, treat that air in the bellows by the steam vent emptying, seals steam vent with bolt, and in bellows, apply grouting pressure again, get final product.
The job practices of foundation structure of the present invention (soil layer geological conditions).
(1) digs foundation ditch on the face of land.
(2) equidistantly bore some straight holes in the bottom of foundation ditch along circumference.
(3) re-use bottom expanding drill equipment, in the reaming of the bottom of straight hole.
(4) in each straight hole, put into the no bonding steel strand that the bottom has the metal embossing, until expanding the bottom outlet bottom.
(5) outside the no bonding steel strand in each straight hole, put bellows, go up to the face of land, down to expanding bottom orifice.
(6) above foundation ditch bottom, straight hole, place annular steel form.
(7) concrete perfusion in the bellows is discharged the soil layer steam vent of mud (slurry coat method) from annular steel form in the straight hole.
(8) when from the soil layer steam vent, beginning to have concrete to discharge, with the sealing of soil layer steam vent, and continue pressure grouting with bolt, stop after reaching design pressure; And remove annular steel form.
(9) arrangement of reinforcement and metal ring are installed in foundation ditch.
(10) concrete perfusion in the foundation ditch forms concrete bearing platform.
(11) after concrete strength reaches design strength, the no bonding steel strand in bellows are applied prestressing force, with key steel strand are locked on the positioning anchor dish then, the positioning anchor dish is positioned at the concrete bearing platform end face, gets final product.
Beneficial effect of the present invention compared with prior art.
(1) structure is highly stable: design feature of the present invention is exactly to form the concrete anchorage by steel strand and metal embossing/positioning anchor dish, utilize the compressive resistance between concrete anchorage and the rock, the uplift resistance of concrete bearing platform is strengthened, fundamentally changed the design of prior art wind driven generator base irrational mix.And, adopted steel strand, have the uplift resistance bigger than same cross-sectional rod iron.
(2) compare with prior art 1, save reinforcing bar 60%, concrete seven 0%.Compare with 3 with prior art 2, steel strand have good uplift resistance, are 1860KN/cm 2 , be example with 36 straight holes, every straight hole is put into 6 steel strand, and every steel strand are 7 strands, have taken full advantage of the performance of steel strand tensions.
Description of drawings
Below in conjunction with the drawings and specific embodiments the present invention is further described.
Fig. 1 is that wind-driven generator steel strand prestress foundation structure of the present invention is applied in the structural representation under the geological conditions of rock stratum.
Fig. 2 is the structural representation that the present invention adopts another kind of fixed part.
Fig. 3 is the structural representation of positioning anchor dish of the present invention.
Fig. 4 is the A-A sectional view of Fig. 3.
Fig. 5 is the structural representation of bamboo shoot shape of the present invention stake.
Fig. 6 is the vertical view of Fig. 5.
Fig. 7 is a kind of arrangement mode schematic diagram of metal embossing of the present invention.
Fig. 8 is that wind-driven generator steel strand prestress foundation structure of the present invention is applied in the structural representation under the soil layer geological conditions.
Fig. 9 is the structural representation of existing wind driven generator base.
Wherein, 1 is that metal embossing, 2 is that expansion bottom outlet, 3 is that steel strand, 4 are that bellows, 5 is that straight hole, 6 is that arrangement of reinforcement, 7 is that positioning anchor dish, 8 is that concrete bearing platform, 9 is that fixed part, 10 is that wind generator tower tube, 11 is that through hole, 12 is that key, 13 is that grout hole, 14 is that steam vent, 15 is that bamboo shoot shape stake, 16 is that elongated pore, 17 is that annular steel form, 18 is that metallic cylinder, 19 is the soil layer steam vent.
The specific embodiment
The job practices (rock stratum geological conditions) of the foundation structure of the present invention of the wind-driven generator installation of embodiment 1:1.5MW.
(1) digging diameter on the face of land is that 10m, the degree of depth are the foundation ditch of 1.6m.
(2) in the bottom of foundation ditch along circumference, adjacent equidistant in twos, drill diameter is that 150mm, the degree of depth are that 10m, quantity are 30 straight hole 5, the distance at the center of straight hole 5 and foundation ditch center is 4.5m.
(3) re-use bottom expanding drill equipment, in the reaming of the bottom of straight hole 5, the diameter that expands bottom outlet 2 is 250mm, highly is 400mm.
(4) bore the dark elongated pore 16 of 200mm in the bottom of expanding bottom outlet 2, in elongated pore 16, put into bamboo shoot shape stake 15, diameter 140mm, height 300mm.
(5) put into 3,7 of the steel strand that the bottom has metal embossing 1 in each straight hole 5.
(6) outside the steel strand 3 in each straight hole 5, put bellows 4, go up to the face of land, down to expanding bottom outlet 2 places.
(7) in straight hole 5, outside the bellows 4, concrete perfusion.
(8) central authorities at foundation ditch arrange metal ring diameter 4m, height 1.5m, and exposing ground matrix section height is 400mm.
(9) put into arrangement of reinforcement, 6,10t is dispersed in the foundation ditch.
(10) in foundation ditch, pour into 120 m 3 Concrete, form concrete bearing platform 8.
(11) after concrete strength reached C40, steel strand 3 applied prestressing force 700KN, with key 12 steel strand 3 were locked on the positioning anchor dish 7 then, and positioning anchor dish 7 is positioned at concrete bearing platform 8 end faces.
(12) again the tube connector of grouting machine is tightened on the grout hole 13 of positioning anchor dish 7, to bellows 4 interior, steel strand 3 gaps perfusion grouting material, treat that the air in the bellows 4 passes through steam vent 14 emptyings, with bolt steam vent 14 is sealed, and apply the grouting pressure of 30N again in the bellows 4, get final product.
The job practices (rock stratum geological conditions) of the foundation structure of the present invention of the wind-driven generator installation of embodiment 2:2MW.
(1) digging diameter on the face of land is that 10m, the degree of depth are the foundation ditch of 1.6m.
(2) in the bottom of foundation ditch along circumference, adjacent equidistant in twos, drill diameter is that 150mm, the degree of depth are that 10m, quantity are 28 straight hole 5, the distance at the center of straight hole 5 and foundation ditch center is 4.5m.
(3) re-use bottom expanding drill equipment, in the reaming of the bottom of straight hole 5, the diameter that expands bottom outlet 2 is 250mm, highly is 400mm.
(4) bore the dark elongated pore 16 of 200mm in the bottom of expanding bottom outlet 2, in elongated pore 16, put into bamboo shoot shape stake 15, diameter 140mm, height 300mm.
(5) put into 3,6 of the steel strand of having tightened with positioning anchor dish 7 the bottom in each straight hole 5, positioning anchor dish 7 is 50mm with the vertical distance that expands bottom outlet 2 bottom surfaces.
(6) outside the steel strand 3 in each straight hole 5, put bellows 4, go up to the face of land, down to expanding bottom outlet 2 places.
(7) in straight hole 5, outside the bellows 4, concrete perfusion.
(8) central authorities at foundation ditch arrange metal ring diameter 4m, height 1.5m, and exposing ground matrix section height is 400mm.
(9) put into arrangement of reinforcement 6,10t is dispersed in the foundation ditch.
(10) in foundation ditch, pour into 120 m 3 Concrete, form concrete bearing platform 8.
(11) after concrete strength reached C40, steel strand 3 applied prestressing force 700KN, with key 12 steel strand 3 were locked on the positioning anchor dish 7 then, and positioning anchor dish 7 is positioned at concrete bearing platform 8 end faces.
(12) again the tube connector of grouting machine is tightened on the grout hole 13 of positioning anchor dish 7, to bellows 4 interior, steel strand 3 gaps perfusion grouting material, treat that the air in the bellows 4 passes through steam vent 14 emptyings, with bolt steam vent 14 is sealed, and apply the grouting pressure of 30N again in the bellows 4, get final product.
The job practices (rock stratum geological conditions) of the foundation structure of the present invention of the wind-driven generator installation of embodiment 3:2MW.
(1) digging diameter on the face of land is that 10m, the degree of depth are the foundation ditch of 1.6m.
(2) in the bottom of foundation ditch along circumference, adjacent equidistant in twos, drill diameter is that 150mm, the degree of depth are that 10m, quantity are 30 straight hole 5, the distance at the center of straight hole 5 and foundation ditch center is 4.5m.
(3) re-use bottom expanding drill equipment, in the reaming of the bottom of straight hole 5, the diameter that expands bottom outlet 2 is 250mm, highly is 400mm.
(4) bore the dark elongated pore 16 of 200mm in the bottom of expanding bottom outlet 2, in elongated pore 16, put into bamboo shoot shape stake 15, diameter 140mm, height 300mm.
(5) put into 3,6 of the steel strand that the bottom has metal embossing 1 in each straight hole 5.
(6) straight at each, outside the steel strand in 5, put bellows 4, go up to the face of land, down to expanding bottom outlet 2 places;
(7) in straight hole 5, outside the bellows 4, concrete perfusion.
(8) central authorities at foundation ditch arrange metal ring diameter 4m, height 1.5m, and exposing ground matrix section height is 400mm.
(9) put into arrangement of reinforcement 6,10t is dispersed in the foundation ditch.
(10) in foundation ditch, pour into 120 m 3 Concrete, form concrete bearing platform 8.
(11) after concrete strength reached C40, steel strand 3 applied prestressing force 700KN, with key 12 steel strand 3 were locked on the positioning anchor dish 7 then, and positioning anchor dish 7 is positioned at concrete bearing platform 8 end faces.
(12) again the tube connector of grouting machine is tightened on the grout hole 13 of positioning anchor dish 7, to bellows 4 interior, steel strand 3 gaps perfusion grouting material, treat that the air in the bellows 4 passes through steam vent 14 emptyings, with bolt steam vent 14 is sealed, and apply the grouting pressure of 30N again in the bellows 4, get final product.
Embodiment 4:(soil layer geological conditions) job practices of the foundation structure of the present invention of the wind-driven generator of 1.5MW installation.
(1) digging diameter on the face of land is that 12m, the degree of depth are the foundation ditch of 2m.
(2) in the bottom of foundation ditch along circumference, adjacent equidistant in twos, drill diameter is that 200mm, the degree of depth are that 10m, quantity are 36 straight hole 5, the distance at the center of straight hole 5 and foundation ditch center is 5.5m.
(3) re-use bottom expanding drill equipment, in the reaming of the bottom of straight hole 5, the diameter that expands bottom outlet 2 is 350mm, highly is 400mm.
(4) put into 3,6 of the no bonding steel strand that the bottom has metal embossing 1 in each straight hole 5, until expanding bottom outlet 2 bottoms.
(5) outside the no bonding steel strand 3 in each straight hole 5, put bellows 4, go up to the face of land, down to expanding bottom outlet 2 places.
(6) placing annular steel form 17 external diameters above foundation ditch bottom, straight hole 5 is 800mm.
(7) to bellows 4 interior concrete perfusions, discharge the soil layer steam vent 19 of mud (slurry coat method) from annular steel form 17 in the straight hole 5.
(8) when from soil layer steam vent 19, beginning to have concrete to discharge, with 19 sealings of soil layer steam vent, and continue pressure grouting with bolt, stop after reaching 30N; And remove annular steel form 17.
(9) arrangement of reinforcement 6 is installed in foundation ditch, 15t and metal ring diameter 4m, height 1.5m, exposing ground matrix section height is 400mm.
(10) concrete perfusion 140 m in the foundation ditch 3 , form concrete bearing platform 8.
(11) after concrete strength reaches C40, the no bonding steel strand 3 in bellows 4 are applied prestressing force 700KN, with key 12 steel strand 3 are locked on the positioning anchor dish 7 then, positioning anchor dish 7 is positioned at concrete bearing platform 8 end faces, gets final product.
Bottom expanding drill equipment is that utility model patent number is 89210660.3, name is called rock bolt bottom expanding drill equipment in the various embodiments described above.It mainly is made up of distance rod, slide block and expansion base plate, is characterized in strengthening the supporting capacity of anchor pole, and bellout diameter is big, and more bit change is convenient.Be applicable to various rock bolts.
The present invention is at the test report of Beipiao City, Liaoning Province peach blossom mountain breeze electricity project wind-driven generator steel strand prestress foundation structure.
Engineering name: Long Yuan wind-power electricity generation Co., Ltd Beipiao City, Liaoning peach blossom mountain breeze electricity steel strand expand the anchor rod experiment engineering.
Unit in charge of construction: Hainan Zhonghai Electricity Power Engineering Co., Ltd.
Detect unit: Liaoning Province's workmanship inspection center.
Pilot project: GJ-1 pull out the true type test of the limit on the GJ-2 steel strand experiment anchor pole.
Test period: on 01 06th, 2013.
Test site: scene, peach blossom mountain, Beipiao City, Liaoning.
Engineering Notice: this pilot project is in order to verify that steel strand prestress foundation structure of the present invention is in wind-powered electricity generation base application feasibility; Determining under the geological conditions of strong-weathered rock, is that the basic anchor pole of anchor pole material pulls out load applying following limit that can reach of certain prestressed situation with steel strand.The corresponding test pile of project position is GJ-1, GJ-2 number, and the test site is positioned near the peach blossom mountain breeze electric field F16 seat in the plane, Beipiao City, Liaoning.
On-the-spot hydrogeological conditions: according to Tongliao China safe engineering investigation Co., Ltd " engineering geologic investigation report ", at embedded depth of foundation scope inner blower on-site strong-weathered rock, can be used as the anchor pole essential bearing stratum.The foundation platform bearing stratum is middle decomposed granite.Do not see that underground water is arranged during the prospecting in the blower fan part place, the standard frost penetration in place is 1.2m.
Process of the test: respectively to GJ-1, each battery of tests of every place, GJ-2 stake position expands end anchor pole and tests (one every group amounts to two).This test basis national standard " building foundation pit supporting tecnical regulations " is relevant regulations (JGJ120-99), adopts the applied CYCLIC LOADING unloading of fundamental test method to carry out, and successively the test anchor pole of GJ-1, GJ-2 stake position is tested.
(1) test anchor pole overview: material specification: OVM15-5 type prestress wire, material are ¢ 15.2 special-purpose steel twisted wires, and every group of anchoring pile is made up of 5 steel strand, pours into pile behind the steel strand overcoat bellows; Anchor hole diameter of phi 130mm; Bellout diameter 230mm expands end height 500mm.Steel strand buried depth 5m.Anchor hole is irritated stake and is adopted C40 level pea gravel concreten or grouting material.
(2) testing equipment and load step: 1, measure respectively with oil pressure gauge and dial gage and pull out heap(ed) capacity and basic displacement, before using through accreditation.2, two sections ends of anchor pole respectively adopt a cover 100t hydraulic jack to load.3, Shi Yan ultimate load is measured 1600kN, and loading grade and the time of stipulating according to " building foundation pit supporting tecnical regulations " load record data.4, accurate for guaranteeing data, every anchor pole loads separately, unloads.
Result of the test is as follows:
Numbering GJ-1 GJ-2
Anchor pole buried depth (m) 5 5
Peak load (KN) 1490 1470
Remarks Destroy Destroy
According to result of the test, can be drawn a conclusion by analysis: GJ-1, GJ-2 steel strand expand end test anchor rod ultimate bearing capacity and are worth 1400 KN greater than designing requirement, satisfy the single anchor pole anti-pulling capacity characteristic value 700KN of design, Ultimate Up-lift Bearing Capacity is not less than the requirement of 1400KN, can satisfy the wind-powered electricity generation base application.
Above content is to further describing that the present invention does in conjunction with concrete preferred embodiment; can not assert that concrete enforcement of the present invention is confined to these explanations; for the general technical staff of the technical field of the invention; without departing from the inventive concept of the premise; can also make some simple deduction or replace, all should be considered as belonging to the definite protection domain of claims that the present invention submits to.

Claims (10)

1. wind-driven generator steel strand prestress foundation structure, the present invention includes the concrete bearing platform (8) of the cylindrical shape of built-in arrangement of reinforcement (6), middle part in the concrete bearing platform (8) is provided with the fixed part (9) of wind-driven generator, the top of fixed part (9) links to each other by the bottom of bolt with wind generator tower tube (10), and its structural feature is:
Below at concrete bearing platform (8) edge has some straight holes (5), and straight hole (5) is distributed on the circumference centered by fixed part; The bottom of straight hole (5) is connected with the expansion bottom outlet (2) of its below, in the straight hole (5) by the steel strand of being formed by some steel wires (3) (under the soil layer geological conditions, can adopt no bonding steel strand 3), the bottom of steel strand (3) has the anchorage part of steel strand (3), and anchorage part is arranged at and expands in the bottom outlet (2); Outside steel strand (3), also be provided with bellows (4), concrete for pouring between bellows (4) and straight hole (5) and in the expansion bottom outlet (2), in the bellows (4), and be that concrete (expect by preferred employing grouting herein between the space of steel strand (3), the grouting material is good fluidity, and has high-intensity material after solidifying, as epoxy resin, high grade rubble cement mortar etc.; Under the geological conditions of rock stratum, need back-grouting, under the soil layer geological conditions, only need in bellows 3, to be in the milk); The upper end of steel strand (3) is fixed on the top of concrete bearing platform (8) by positioning anchor dish (7).
2. wind-driven generator steel strand prestress foundation structure according to claim 2, it is characterized in that: described positioning anchor dish (7) is the metal dish of a cylindrical shape, is provided with grout hole (13) at the center of positioning anchor dish (7); Centered by grout hole (13), radius less than the circumference of positioning anchor dish (7) on the through hole (11) of uniform some reverse frustoconics, its quantity is corresponding with the quantity of steel strand (3); In the through hole (11) of reverse frustoconic, be provided with split type key (12), each key (12) is combined to form a rounding platform, each key (12) is the split that waits of this rounding platform, the cylinder cambered surface that key (12) inboard is combined to form and steel strand (3) outside corresponding; Between the through hole (11) of reverse frustoconic and grout hole (13), also be provided with a steam vent (14).
3. wind-driven generator steel strand prestress foundation structure according to claim 2, it is characterized in that: described key (12) is two.
4. wind-driven generator steel strand prestress foundation structure according to claim 2, it is characterized in that: the metal embossing (1) that the anchorage part of described steel strand (3) adopts embossing machine to be pressed into, maybe can adopt the positioning anchor dish (7) with split type key (12), the bottom of steel strand (3) is tightened, and place in the expansion bottom outlet (2).
5. wind-driven generator steel strand prestress foundation structure according to claim 4 is characterized in that: described metal embossing (1) in expanding bottom outlet (2) for dispersion, freely arrange, or from top to bottom, the arrangement mode of alternating expression.
6. wind-driven generator steel strand prestress foundation structure according to claim 5, it is characterized in that: the bottom centre at described expansion bottom outlet (2) arranges elongated pore (16), the position of this elongated pore (16) is corresponding with straight hole (5), the diameter of elongated pore (16) should be less than the diameter of straight hole (5), and the bottom of bamboo shoot shape stake (15) places (bamboo shoot shape stake 15 adopts metal or concrete cast to form) in the elongated pore (16).
7. wind-driven generator steel strand prestress foundation structure according to claim 2, it is characterized in that: be provided with annular steel form (17) in the top of straight hole (5), there is the hole corresponding with bellows (4) external diameter at the center of this annular steel form (17); In addition, also be provided with soil layer steam vent (19) (can the outer rim below annular steel form 17 arrange highly be that 200~500mm, thickness are the metallic cylinder 18 of 5~10mm) on the annular steel form (17) of straight hole (5) top.
8. wind-driven generator steel strand prestress foundation structure according to claim 1, it is characterized in that: described fixed part (9) is the metal ring of a cylindrical shape; Or inverse flange, inverse flange is to be made of upper flange and lower flange, links to each other by bolt between upper flange and lower flange, the top of bolt is fixed on the interior flange in the bottom of wind generator tower tube (10) by nut.
9. the job practices of a wind-driven generator steel strand prestress foundation structure is characterized in that: under the rock geology condition,
(1) digs foundation ditch on the face of land;
(2) in the bottom of foundation ditch along circumference, equidistantly bore some straight holes (5);
(3) re-use bottom expanding drill equipment, in the bottom reaming of straight hole (5);
(4) bore elongated pore (16) in the bottom of expanding bottom outlet (2), in elongated pore (16), put into bamboo shoot shape stake (15);
(5) in each straight hole (5), put into the steel strand (3) that the bottom has metal embossing (1);
(6) outside the steel strand (3) in each straight hole (5), put bellows (4), go up to the face of land, locate down to expanding bottom outlet (2);
(7) in the straight hole (5), outside the bellows (4), concrete perfusion;
(8) central authorities at foundation ditch arrange metal ring;
(9) arrangement of reinforcement (6) is installed in foundation ditch;
(10) concrete perfusion in the foundation ditch forms concrete bearing platform (8);
(11) after concrete strength reaches design strength, steel strand (3) in bellows (4) are applied prestressing force, use key (12) that steel strand (3) are locked on the positioning anchor dish (7) then, positioning anchor dish (7) is positioned at concrete bearing platform (8) end face;
(12) again the tube connector of grouting machine is tightened on the grout hole (13) of positioning anchor dish (7),, steel strand (3) gap perfusion grouting material interior to bellows (4), treat that the air in the bellows (4) passes through steam vent (14) emptying, with bolt steam vent (14) is sealed, and in bellows (4), apply grouting pressure again, get final product.
10. the job practices of a wind-driven generator steel strand prestress foundation structure is characterized in that: under the soil layer geological conditions,
(1) digs foundation ditch on the face of land;
(2) equidistantly bore some straight holes (5) in the bottom of foundation ditch along circumference;
(3) re-use bottom expanding drill equipment, in the bottom reaming of straight hole (5);
(4) in each straight hole (5), put into the no bonding steel strand (3) that the bottom has metal embossing (1), until expanding bottom outlet (2) bottom;
(5) outside the no bonding steel strand (3) in each straight hole (5), put bellows (4), go up to the face of land, locate down to expanding bottom outlet (2);
(6) place annular steel form (17) in the top of foundation ditch bottom, straight hole (5);
(7) to the interior concrete perfusion of bellows (4), discharge the soil layer steam vent (19) of mud (slurry coat method) from annular steel form (17) in the straight hole (5);
(8) when from soil layer steam vent (19), beginning to have concrete to discharge, with soil layer steam vent (19) sealing, and continue pressure grouting with bolt, stop after reaching design pressure; And remove annular steel form (17);
(9) arrangement of reinforcement (6) and metal ring are installed in foundation ditch;
(10) concrete perfusion in the foundation ditch forms concrete bearing platform (8);
(11) after concrete strength reaches design strength, no bonding steel strand (3) in bellows (4) are applied prestressing force, use key (12) that steel strand (3) are locked on the positioning anchor dish (7) then, positioning anchor dish (7) is positioned at concrete bearing platform (8) end face, gets final product.
CN201310187797.6A 2013-05-21 2013-05-21 Steel strand prestress base structure of wind driven generator and construction method thereof Expired - Fee Related CN103266621B (en)

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CN105019452A (en) * 2015-07-22 2015-11-04 曾旻 Combined expanding head and rock-soil body composite anchor cable
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