CN203498859U - Novel prestress steel stranded wire foundation - Google Patents

Novel prestress steel stranded wire foundation Download PDF

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Publication number
CN203498859U
CN203498859U CN201320448599.6U CN201320448599U CN203498859U CN 203498859 U CN203498859 U CN 203498859U CN 201320448599 U CN201320448599 U CN 201320448599U CN 203498859 U CN203498859 U CN 203498859U
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steel strand
cushion cap
concrete
hole
novel
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Chinese (zh)
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孟岍
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BEIJING HUADIAN XINNENG CONSULTATION Co Ltd
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BEIJING HUADIAN XINNENG CONSULTATION Co Ltd
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Abstract

The utility model provides a novel prestress steel stranded wire foundation, which relates to improvement of a wind driven generator rock layer and a soil layer foundation structure as well as a construction method of the improvement. The utility model provides the novel prestress steel stranded wire foundation with the advantages that the foundation is very stable, and raw materials are saved. The middle part in a concrete bearing table of the novel prestress steel stranded wire foundation is provided with a fixing part of a wind driven generator, the upper part of the concrete bearing table is connected with the bottom of a fan tower tube through screw bolts, the lower part of the edge of the concrete bearing table is provided with straight holes, the straight holes are uniformly distributed in the circumference using the fixing part as a center, the bottoms of the straight holes are communicated with expansion bottom holes formed under the straight holes, steel stranded wires are arranged in the straight holes, the bottom ends of the steel stranded wires are provided with steel stranded wire anchoring parts arranged in the expansion bottom holes, corrugated pipes are also arranged outside the steel stranded wires, concrete is filled between the corrugated pipes and the straight holes and in the expansion bottom holes, concrete is filled in the corrugated pipes and in gaps of the steel stranded wires, and the upper ends of the steel stranded wires are fixedly arranged above the concrete bearing table through a positioning anchor disc.

Description

A kind of novel pre-stressed steel strand basis
Technical field
the utility model belongs to technical field of wind power generation, more particularly, relates to a kind of improvement of wind-driven generator steel strand prestress foundation structure.
Background technology
existing foundation structure of wind-driven generator is generally following structure: (see figure 9) arranges the taper coagulation soil matrix of footpath 16 ~ 20m, dark 3m left and right always under earth's surface, and the weight of its coagulation soil matrix 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 coagulation soil matrix, and the top of this metal ring is flange, and metal ring top flange and top wind-driven generator tower flange fix by bolt, and other parts of metal ring and grafting reinforcing bar be Transducers Embedded in Concrete together.
the shortcoming of above-mentioned existing structure is: the diameter of its coagulation soil matrix is 16 ~ 20m, need to be large at earth's surface perforated area, and vertical depth 3m is dark, so engineering quantity is larger; In addition, the weight of coagulation soil matrix is 40 ~ 50t, 400 ~ 500m 3 , amount of reinforcement 40 ~ 60t, consumable material is very many.
chinese utility model patent, the patent No. is: 201120307606.1, name is called: weathered rock stratum bottom-expanding anchor rod base of wind driven generator, it discloses a kind of basic architecture advances that is positioned at 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 and upper flange are bolted, 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 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 greater than on the circumference that described upper flange external profile diameter and is less than described upper flange external profile diameter the even long bolt that is furnished with respectively, the bottom of described long bolt is provided with at least two link plates.This structure remain deficiency be: because the main long bolt that plays uplift effect is all fixed on the lower flange of connecting cylinder, and the size of connecting cylinder is corresponding with the bottom of blower fan cylindrical shell, therefore the load of long bolt is very large, easily tired, the anchor rod foundation structure of visible this utility model is generally applicable to small-sized wind power generator, and limitation is strong.
chinese utility model 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 in building construction project for fixing main equipments such as frame or pylon, and mainly utilize the technical field of the foundation construction structure that the frame for movement of concrete and rigid material forms.Comprise base concrete cylinder cushion cap and to circle-shaped equally distributed high-strength grouting post of being of downward-extension, in this high-strength grouting post, by pressure grouting, be fixed with the anchor pole that can penetrate in described base concrete cylinder cushion cap; This base concrete cylinder cushion cap coaxially arranges ring-type finish rolling reinforcing bar.Adopt this structure can make whole basis bear the huge bending moment being transmitted by 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 inadequate, and the high strength of this utility model grouting post and anchor pole form a kind of friction pile, but not bearing peg.Take diameter as 8m(100m 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 to 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, a certain anchor pole may lose efficacy, and then caused adjacent anchor pole to lose efficacy, and even whole wind-driven generator tower is tumbled.
Summary of the invention
the utility model is exactly for the problems referred to above, makes up the deficiencies in the prior art, provide a kind of basis highly stable, save raw-material novel pre-stressed steel strand basis.
for realizing above-mentioned purpose of the present utility model, the utility model adopts following technical scheme.
the utility model comprises the concrete bearing platform of the cylindrical shape of built-in arrangement of reinforcement, middle part in concrete bearing platform is provided with the fixed part of wind-driven generator, the top of fixed part is connected with the bottom of wind-driven generator tower by bolt, its structural feature: have some straight holes below 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 straight hole by the steel strand that formed by some steel wires (under soil layer geological conditions, can adopt without bonding steel strand), the bottom of steel strand has the anchorage part of steel strand, and anchorage part is arranged at and expands in bottom outlet; At steel strand, be also provided with bellows outward, concrete for pouring between bellows and straight hole and in expansion bottom outlet, in bellows, and for concrete, (preferably adopt grouting material herein between the space of steel strand, grouting material is good fluidity, and after solidifying, there is high-intensity material, as epoxy resin, high grade rubble cement mortar etc.; Under the geological conditions of rock stratum, need back-grouting, under soil layer geological conditions, only need to ripple ipe grout); The upper end of steel strand is fixed on the top of concrete bearing platform by positioning anchor dish.
described concrete bearing platform is to consist of upper cushion cap and lower cushion cap two parts, upper cushion cap is cylindrical, lower cushion cap is reverse frustoconic, the diameter of upper cushion cap should be greater than the diameter at lower cushion cap top, the fixed position of wind-driven generator is cushion cap in the top of lower cushion cap, perforation, straight hole is distributed in and holds edge of table below, between the below of fixed part and the bottom surface of lower cushion cap, is provided with support column; Upper cushion cap and lower cushion cap adopt steel concrete to make.Preferred version as aforementioned schemes, in described upper cushion cap, comprise a discoid reinforced concrete plinth, be positioned at the bottom of cushion cap, also comprise some support floors, supporting floor and described reinforced concrete plinth and the fixed part of wind-driven generator is vertical setting, support on floor vertical and be provided with through hole, this through hole is corresponding with the straight hole below above holding edge of table; Supporting floor is to be made by steel concrete, between the support floor of upper cushion cap, is backfill.The extended line that supports floor facade should pass through the center of upper fixed part, and by the cross section circle decile of fixed part, preferably arranges 8 and support floor.
particularly, the diameter of upper cushion cap is 8000 ~ 13000mm, is highly 500 ~ 1000mm, and the end face diameter of lower cushion cap is 6000 ~ 7000mm, and bottom surface diameter is 5000 ~ 6000mm, is highly 1500 ~ 2000mm; The diameter of reinforced concrete plinth is identical with upper cushion cap, is highly 400 ~ 500mm, and the height that supports floor is identical with upper cushion cap, and thickness is 900 ~ 1000mm.
in practical operation, first on ground, dig a columniform foundation ditch, then on the ground at this foundation ditch center, continue to dig the foundation ditch of a reverse frustoconic, a circle support column is set in the bottom surface of reverse frustoconic foundation ditch, for supporting the fixed part of its top; Then, in the bottom of cylindrical foundation ditch, make a reinforced concrete plinth around fixed part, more some support floors are set on this reinforced concrete plinth; Finally, between support floor, pour backfill into.The structural advantages of this concrete bearing platform is: reduce the consumption of concrete and steel, by 50 tons, be reduced to 20 tons of left and right.
particularly, described positioning anchor dish is the metal dish of a cylindrical shape, at positioning anchor Pan center, is provided with grout hole; Centered by grout hole, radius is less than the through hole of uniform some reverse frustoconics (remove truncated cone by a plane that is parallel to circular cone bottom surface, the part between bottom surface and cross section is round platform) on the circumference of positioning anchor dish, its quantity is corresponding with the quantity of steel strand; Between the through-hole wall of reverse frustoconic and steel strand, be provided with split type key, each key is combined to form an inverted round stage, and each key is this inverted round stage waits split, and the cylinder cambered surface that key inner side is combined to form is corresponding with the outside of steel strand; Between the through hole of reverse frustoconic and grout hole, be also provided with a steam vent.In positioning anchor dish of the present utility model, described key is two; Its effect is: utilize the structure of its reverse frustoconic, tile, inside 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 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 be placed in expansion bottom outlet.
described metal embossing can be to disperse to arrange, freely arrange in expanding bottom outlet, can be also from top to bottom, the arrangement mode of alternating expression; The one, prevent the phase mutual interference between 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 utility model, 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 is placed in elongated pore; The stake of bamboo shoot shape can adopt metal or pouring concrete to form.The effect of this bamboo shoot shape stake is: utilize it with the tip of cambered surface, make the metal embossing of steel strand bottom be evenly distributed in the cambered surface of bamboo shoot shape stake peripheral.
further, described steel strand are that 7 steel wire strands are coiled into one.
as another kind of preferred version of the present utility model, the screwed hole that grout hole is M30, this screwed hole can coordinate with the tube connector of grouting machine, to be fixedly connected with pipe; Steam vent is the screwed hole of M16, and after the Bas Discharged in bellows, the threaded engagement of available bolt and steam vent, seals 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 consist of upper flange and lower flange, between upper flange and lower flange, by bolt, is connected, the top of bolt is fixed on the flange in the bottom in wind-driven generator tower by nut.
the utility model wind-driven generator steel strand prestress foundation structure of said structure is under soil layer geological conditions, and due to the particularity of soil layer geological conditions, change has occurred corresponding construction technology; Therefore, as a kind of improvement of the present utility model, in 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, on the annular steel form of straight hole top, be also provided with soil layer steam vent.And, for in soil layer pressure grouting process, prevent that the mud of being discharged by soil layer steam vent from flowing out from the space of annular steel form and straight hole upper end, arranging on can the outer rim below annular steel form is highly the metallic cylinder that 200 ~ 500mm, thickness are 5 ~ 10mm, embeds the ground, bottom of foundation ditch.
the construction method of the utility model foundation structure (rock stratum geological conditions).
(1) on earth's surface, dig foundation ditch.
(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) in the bottom of expanding bottom outlet, bore elongated pore, in elongated pore, put into the stake of bamboo shoot shape.
(5) in each straight hole, put into bottom with the steel strand of metal embossing.
(6) outside the steel strand in each straight hole, put bellows, upper to earth's surface, down to expanding bottom orifice.
(7) in straight hole, outside bellows, concrete perfusion.
(8) central authorities at foundation ditch arrange metal ring.
(9) arrangement of reinforcement is installed in foundation ditch.
(10), to concrete perfusion in foundation ditch, form concrete bearing platform.
(11) concrete strength reaches after design strength, and the steel strand in bellows are applied to prestressing force, then with key, steel strand is locked on positioning anchor dish, and positioning anchor dish is positioned at 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 bellows, by steam vent emptying, seals steam vent with bolt, and in bellows, apply grouting pressure again.
the construction method of the utility model foundation structure (soil layer geological conditions).
(1) on earth's surface, dig foundation ditch.
(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) to put in each straight hole bottom with metal embossing without bonding steel strand, until expand bottom outlet bottom.
(5) in each straight hole without outside bonding steel strand, put bellows, upper to earth's surface, down to expanding bottom orifice.
(6) above foundation ditch bottom, straight hole, place annular steel form.
(7) to concrete perfusion in bellows, in the soil layer steam vent of the mud in straight hole (slurry coat method) from annular steel form, discharge.
(8) when starting to have concrete to discharge from soil layer steam vent, with bolt, by the sealing of soil layer steam vent, and continue pressure grouting, stop after reaching design pressure; And remove annular steel form.
(9) arrangement of reinforcement and metal ring are installed in foundation ditch.
(10), to concrete perfusion in foundation ditch, form concrete bearing platform.
(11) concrete strength reaches after design strength, to apply prestressing force without bonding steel strand in bellows, then with key, steel strand is locked on positioning anchor dish, and positioning anchor dish is positioned at concrete bearing platform end face.
the beneficial effects of the utility model compared with prior art.
(1) structure is highly stable: design feature of the present utility model is exactly to form concrete anchorage by steel strand and metal embossing/positioning anchor dish, utilize the compressive resistance between concrete anchorage and 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, there is the uplift resistance larger 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 , take 36 straight holes as example, every straight hole is put into 6 steel strand, and every steel strand are 7 strands, take full advantage of the performance of steel strand tension.
Accompanying drawing explanation
below in conjunction with the drawings and specific embodiments, the utility model is further described.
fig. 1 is that the utility model wind-driven generator steel strand prestress foundation structure is applied in the structural representation under the geological conditions of rock stratum.
fig. 2 is the structural representation that the utility model adopts another kind of fixed part.
fig. 3 is the structural representation of the utility model positioning anchor dish.
fig. 4 is the A-A sectional view of Fig. 3.
fig. 5 is the structural representation of the utility model bamboo shoot shape stake.
fig. 6 is the top view of Fig. 5.
fig. 7 is a kind of arrangement mode schematic diagram of the utility model metal embossing.
fig. 8 is that the utility model wind-driven generator steel strand prestress foundation structure is applied in the structural representation under soil layer geological conditions.
fig. 9 is the structural representation of existing wind driven generator base.
figure 10 is the structural representation of a kind of concrete bearing platform of the utility model.
figure 11 is the top view of Figure 10.
wherein, 1 is that metal embossing, 2 is for expanding bottom outlet, 3 for steel strand, 4 are for bellows, 5 is for straight hole, 6 is for arrangement of reinforcement, 7 is for positioning anchor dish, 8 is for concrete bearing platform, 9 is for fixed part, 10 is for wind-driven generator tower, 11 is for through hole, 12 is for key, 13 is for grout hole, 14 is for steam vent, 15 is for bamboo shoot shape stake, 16 is for elongated pore, 17 is for annular steel form, 18 is for metallic cylinder, 19 is for soil layer steam vent, 20 is for through hole, 21 is for upper cushion cap, 22 is for lower cushion cap, 23 is for support column, 24 is for reinforced concrete plinth, 25 is for supporting floor.
The specific embodiment
the construction method (rock stratum geological conditions) of the utility model foundation structure of the wind-driven generator installation of embodiment 1:1.5MW.
(1) on earth's surface, digging diameter is the foundation ditch that 10m, the degree of depth are 1.6m.
(2) in the bottom of foundation ditch along circumference, adjacent equidistant between two, drill diameter is that 150mm, the degree of depth are that 10m, quantity are the straight hole 5 of 30, 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) in the bottom of expanding bottom outlet 2, bore the dark elongated pore 16 of 200mm, in elongated pore 16, put into bamboo shoot shape stake 15, diameter 140mm, height 300mm.
(5) to putting into bottom in each straight hole 5 with 3,7 of the steel strand of metal embossing 1.
(6) outside the steel strand 3 in each straight hole 5, put bellows 4, upper to earth's surface, down to expanding bottom outlet 2 places.
(7) in straight hole 5, outside bellows 4, concrete perfusion.
(8) central authorities at foundation ditch arrange metal ring diameter 4m, height 1.5m, and exposing earth's surface Partial Height is 400mm.
(9) put into arrangement of reinforcement, 6,10t, is dispersed in foundation ditch.
(10) in foundation ditch, pour into 120 m 3 concrete, form concrete bearing platform 8.
(11) concrete strength reaches after C40, and steel strand 3 apply prestressing force 700KN, then with key 12, steel strand 3 is locked on positioning anchor dish 7, 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, in bellows 4, steel strand 3 gaps perfusions grouting materials, treat that the air in bellows 4 passes through steam vent 14 emptyings, with bolt, steam vent 14 is sealed, and again to the grouting pressure that applies 30N in bellows 4.
embodiment 2:(soil layer geological conditions) construction method of the utility model foundation structure of the wind-driven generator of 1.5MW installation.
(1) on earth's surface, digging diameter is the foundation ditch that 12m, the degree of depth are 2m.
(2) in the bottom of foundation ditch along circumference, adjacent equidistant between two, drill diameter is that 200mm, the degree of depth are that 10m, quantity are the straight hole 5 of 36, 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) to put in each straight hole 5 bottom with metal embossing 1 without 3,6 of bonding steel strand, until expand bottom outlet 2 bottoms.
(5) in each straight hole 5 without outside bonding steel strand 3, put bellows 4, upper to earth's surface, down to expanding bottom outlet 2 places.
(6) above foundation ditch bottom, straight hole 5, placing annular steel form 17 external diameters is 800mm.
(7), to the interior concrete perfusion of bellows 4, in the soil layer steam vent 19 of the mud in straight hole 5 (slurry coat method) from annular steel form 17, discharge.
(8) when starting to have concrete to discharge from soil layer steam vent 19, with bolt, by 19 sealings of soil layer steam vent, and continue pressure grouting, 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 earth's surface Partial Height is 400mm.
(10) to concrete perfusion 140 m in foundation ditch 3 , form concrete bearing platform 8.
(11) concrete strength reaches after C40, to apply prestressing force 700KN without bonding steel strand 3 in bellows 4, then with key 12, steel strand 3 is locked on positioning anchor dish 7, and positioning anchor dish 7 is positioned at concrete bearing platform 8 end faces.
in above-mentioned two embodiment, bottom expanding drill equipment is that utility model patent number is 89210660.3, name is called rock anchor rod counterboring bit equipment.It is mainly comprised of distance rod, slide block and expansion base plate, is characterized in strengthening the supporting capacity of anchor pole, and bellout diameter is large, and more bit change is convenient.Be applicable to various rock bolts.
the utility model is at the test report of peach blossom mountain, Beipiao City, Liaoning Province Wind Power 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 anchor rod experiment engineering.
unit in charge of construction: Hainan Zhonghai Electricity Power Engineering Co., Ltd.
detect unit: Liaoning Province workmanship inspection center.
pilot project: GJ-1 pull out the true type test of the limit on GJ-2 steel strand experiment anchor pole.
test period: on 01 06th, 2013.
test site: Beipiao, liaoning peach blossom mountain is on-the-spot.
engineering Notice: this pilot project is in order to verify that the utility model steel strand prestress foundation structure is in wind-powered electricity generation base application feasibility; Determine under the geological conditions of strong-weathered rock, the foundation anchor that the steel strand of take are anchor pole material pulls out load applying in the limit that can reach in certain prestressed situation.The corresponding test pile of project position is GJ-1, No. GJ-2, and test site is positioned near Beipiao, liaoning peach blossom mountain breeze electric field F16 seat in the plane.
on-the-spot hydrogeological conditions: according to the < < of Tongliao Hua Tai 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 anchor rod foundation bearing stratum.Foundation platform bearing stratum is middle decomposed granite.During reconnoitring in blower fan part place, there are no underground water, 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, amount to two).This test basis national standard < < building foundation pit supporting tecnical regulations > > (JGJ120-99) relevant regulations, adopt the applied CYCLIC LOADING unloading of fundamental test method to carry out, successively the test anchor pole of GJ-1, GJ-2 stake position is tested.
test anchor pole overview: material specification: OVM15-5 type prestress wire, material is ¢ 15.2 special-purpose steel twisted wires, every group of anchoring pile is comprised of 5 steel strand, after steel strand overcoat bellows, pours into pile; Anchor hole diameter of phi 130mm; Bellout diameter 230mm, expands end height 500mm.Steel strand buried depth 5m.Anchor hole is filled with stake and is adopted C40 level pea gravel concreten or grouting material.
testing equipment and load step: (1) is measured respectively and pulled out heap(ed) capacity and basic displacement with oil pressure gauge and dial gage, used front through accreditation.(2) two sections of ends of anchor pole respectively adopt a set of 100t hydraulic jack to load.(3) ultimate load of test measures 1600kN, and loading grade and the time of according to < < building foundation pit supporting tecnical regulations > >, stipulating 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 expansion end test anchor rod ultimate bearing capacity are greater than designing requirement and are worth 1400 KN, meet 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 meet wind-powered electricity generation base application.
above content is the further description of the utility model being done in conjunction with concrete preferred embodiment; can not assert that concrete enforcement of the present utility model is confined to these explanations; for the utility model person of an ordinary skill in the technical field; without departing from the concept of the premise utility; can also make some simple deduction or replace, all should be considered as belonging to the definite protection domain of claims that the utility model is submitted to.

Claims (10)

1. novel pre-stressed steel strand are basic, the concrete bearing platform (8) that comprises the cylindrical shape of built-in arrangement of reinforcement (6), middle part in concrete bearing platform (8) is provided with the fixed part (9) of wind-driven generator, the top of fixed part (9) is connected with the bottom of wind-driven generator tower (10) by bolt, it is characterized in that:
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, and in straight hole (5), by the steel strand that are comprised of some steel wires (3), the bottom of steel strand (3) has the anchorage part of steel strand (3), and anchorage part is arranged at and expands in bottom outlet (2); Outside steel strand (3), being also provided with bellows (4),, for the concrete of perfusion, in bellows (4), and is concrete between the space of steel strand (3) between bellows (4) and straight hole (5) and in expansion bottom outlet (2); The upper end of steel strand (3) is fixed on the top of concrete bearing platform (8) by positioning anchor dish (7);
Described concrete bearing platform is to consist of upper cushion cap (21) and lower cushion cap (22) two parts, upper cushion cap (21) is cylindrical, lower cushion cap (22) is reverse frustoconic, the diameter of upper cushion cap (21) should be greater than the diameter at lower cushion cap (22) top, the fixed part of wind-driven generator (9) is positioned at cushion cap (21) on the top, perforation of lower cushion cap (22), straight hole (5) is distributed in the below, edge of cushion cap (21), between the below of fixed part (9) and the bottom surface of lower cushion cap (22), is provided with support column (23); Upper cushion cap (21) and lower cushion cap (22) adopt steel concrete to make.
2. novel pre-stressed steel strand according to claim 1 are basic, it is characterized in that: in described upper cushion cap (21), comprise a discoid reinforced concrete plinth (24), be positioned at the bottom of cushion cap (21), also comprise some support floors (25), supporting floor (25) is vertical setting with described reinforced concrete plinth (24) and the fixed part (9) of wind-driven generator, support on floor (25) vertical and be provided with through hole (20), the straight hole (5) below the edge of this through hole (20) and upper cushion cap (21) is corresponding; Supporting floor (25) is to be made by steel concrete, between the support floor (25) of upper cushion cap (21), is backfill; The extended line that supports floor (25) facade should pass through the center of upper fixed part (9), and by the cross section circle decile of fixed part (9).
3. novel pre-stressed steel strand according to claim 2 basis, is characterized in that: described support floor (25) is 8.
4. novel pre-stressed steel strand according to claim 1 basis, is characterized in that: described positioning anchor dish (7) is the metal dish of a cylindrical shape; Centered by grout hole (13), radius is less than the through hole (11) of uniform some reverse frustoconics on the circumference of positioning anchor dish (7), 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 an inverted round stage, the split such as grade that each key (12) is this inverted round stage, the cylinder cambered surface that key (12) inner side is combined to form is corresponding with the outside of steel strand (3); Between the through hole (11) of reverse frustoconic and grout hole (13), be also provided with a steam vent (14).
5. novel pre-stressed steel strand according to claim 4 basis, is characterized in that: described key (12) is two.
6. novel pre-stressed steel strand according to claim 4 are basic, 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, or employing is with the positioning anchor dish (7) of split type key (12), the bottom of steel strand (3) is tightened, and be placed in expansion bottom outlet (2).
7. novel pre-stressed steel strand according to claim 6 basis, 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.
8. novel pre-stressed steel strand according to claim 4 are basic, 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) is placed in elongated pore (16).
9. novel pre-stressed steel strand according to claim 4 basis, is characterized in that: in the top of straight hole (5), be provided with annular steel form (17), there is the hole corresponding with bellows (4) external diameter at the center of this annular steel form (17); In addition, on the annular steel form (17) of straight hole (5) top, be also provided with soil layer steam vent (19).
10. novel pre-stressed steel strand according to claim 1 basis, is characterized in that: described fixed part (9) is the metal ring of a cylindrical shape; Or inverse flange, inverse flange is to consist of upper flange and lower flange, between upper flange and lower flange, by bolt, is connected, the top of bolt is fixed on the flange in the bottom in wind-driven generator tower (10) by nut.
CN201320448599.6U 2013-07-26 2013-07-26 Novel prestress steel stranded wire foundation Expired - Fee Related CN203498859U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110117962A (en) * 2018-02-06 2019-08-13 北京华电新能咨询有限公司 A kind of iron tower of power transmission line base expanding and base expanding anchor cable basis

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110117962A (en) * 2018-02-06 2019-08-13 北京华电新能咨询有限公司 A kind of iron tower of power transmission line base expanding and base expanding anchor cable basis

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