CN103485332B - A kind of construction method of precast energy pile - Google Patents
A kind of construction method of precast energy pile Download PDFInfo
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- CN103485332B CN103485332B CN201310441978.7A CN201310441978A CN103485332B CN 103485332 B CN103485332 B CN 103485332B CN 201310441978 A CN201310441978 A CN 201310441978A CN 103485332 B CN103485332 B CN 103485332B
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Abstract
A construction method for precast energy pile, is characterized in that: heat-transfer pipe is embedded in hollow steel pipe, and hollow steel pipe substitutes traditional solid reinforcing bar as the main muscle of preformed pile; In order to connect the heat-transfer pipe in preformed pile, pre-buried heat transfer bend pipe and heat-transfer pipe joint in prefabricated shoe and prefabricated pile cover.Heat-transfer pipe is embedded in hollow steel pipe by the technology of the present invention, efficiently solves heat-transfer pipe and main muscle colligation and buries the mutual interference, concrete density, the reinforcement corrosion that cause underground and affect the technical problems such as pile foundation total bearing capacity; And pipe laying survival rate is higher, is convenient to pile body and stacks in a large number and transportation safety, construction period short, the underground space and construction costs are saved.
Description
Technical field
The present invention relates to the technical field of earth-source hot-pump system energy piles, particularly relate to a kind of construction method of precast energy pile.Mainly be applicable to building pile foundation and technical field of ground source heat pump.
Background technology
Ground source heat pump technology is a kind of new technology effectively utilizing underground regenerative resource, reduces discharging strategy significant to national energy-saving.This technology utilizes the soil of underground, surface water, the metastable characteristic of underground water equitemperature, by being that storage bodies carries out exchange heat (underground heat is delivered in top-out by winter with the earth; Summer by top heat storage in underground) the air-conditioning system of the energy, thus traditional air conditioner technology can be substituted.Embedded underground heat exchanger is construction Difficulties and the key target for investment of geothermal heat pump air-conditioning system.Correlative study shows, the very crucial step of of earth-source hot-pump system installed by lower pipe, and whether the success or not of lower pipe determines system can the key link of installation and operation smoothly.By the pattern that heat exchanger pipe laying combines with building pile foundation, construction sequence and the underground pipe that effectively can solve special pipe laying take underground space problem, thus greatly save construction costs, obtain the concern of engineers and technicians in recent years gradually.Energy piles ground source heat pump technology, according to the difference of pile foundation construction process, be mainly divided in castinplace pile bury underground with prefabricated tubular pile in bury two kinds underground.
Before making the present invention, Chinese invention patent " heat-transferring method of the geothermal heat exchanger of pile imbedded helix tube type ground source heat pump system " (patent No.: ZL200810159583.7) discloses one colligation on the borehole filling pile cage of reinforcement of building foundation and buries helix tube type heat-transfer pipe underground, and earth source heat pump heat-transfer pipe is buried underground and set the technical scheme of simultaneously carrying out with building pile basis.This technical scheme heat-transfer pipe of simultaneously constructing is buried underground and bored pile, earth source heat pump construction is combined with routine building pile foundation construction, eliminate special boring and bury heat-transfer pipe underground, reduce the initial outlay of earth-source hot-pump system, improve efficiency of construction and easy construction is convenient.But heat-transfer pipe colligation at reinforcing cage sidewall, is occupied the volume of reinforcing cage surrounding concrete originally by this technical scheme, if heat-transfer pipe volume is comparatively large, will reduces volume of concrete in castinplace pile, thus affect the total bearing capacity of pile foundation; The helix tube type of binding-type is buried underground reinforcing cage periphery concrete vibration compacting control effect larger, easily cause reinforcing cage near zone space, under the effect of heat-transfer pipe cold cycling, cause the etching machine of reinforcing cage to increase, finally cause the reduction of pouring pile bearing capacity; The heat-transfer pipe of reinforcing cage sidewall colligation simultaneously easily damages in concrete vibrating compacting process, thus the survival rate that reduction heat-transfer pipe is buried underground.In addition, in castinplace pile, bury heat-transfer pipe underground, not easily change after concrete perfusion, namely once after damaging, be not easy to change.
Pretensioning prestressed concrete (or high-strength concrete) pile tube is a kind of hollow cylinder elongate concrete prefabricated units adopting pretensioned prestressing technique and centrifugal casting to make, primarily of compositions such as cylindrical shape pile body, end plate and steel hoops, this pile-type has the advantages such as pile strength is high, pile setting capability is strong, bearing capacity of single pile is high, short construction period, cost are low and is easy to batch production, is thus widely used in Practical Project, raw material for pile for prestressed pipe are selected, tube coupling manufactures, pile tube splices, quality control, the examination and test of products, store, the correlative details such as transport have formulated corresponding technical specification (as: product national standard " Pretensioned spun concrete piles " GB13476-1999, " pretensioning prestressed concrete thin-wall pipe pile " JC888-2001, " pretensioned-prestressed tube pile production Technology code " (FS/QW01-2002), prestressed concrete pipe pile (atlas) 03SG409, Guangdong standard " pile for prestressed pipe basic technology code " DBJ15-22-98 etc.), belong to the technology of relative maturity.Before making the present invention, Chinese invention patent " a kind of Pretensioned prestressed concrete polygonal pile and production method thereof " (patent No.: ZL201010214287.X) discloses one and utilizes pre-tensioning system, concrete perfusion inside and outside reinforcing bar cage, formation inner circular, outside are the prestressed concrete polygonal pile on more than five limits.This technical scheme is by being changed to the polygon on more than five limits by the outer ring limit of pile for prestressed pipe, polygonal profile is conducive to stacking and the transportation safety of pile body, and polygon is also conducive to improving unit materials stake side surface area simultaneously, thus improves pile side friction.
Energy piles ground source heat pump technology is a kind of technical method effectively utilizing geothermal energy, reduce special boring pipe laying operating expenses and reasonable Arrangement and using underground space.But, in precast prestressed stake on prestressed constructions reinforcing cage the embedding manner of colligation heat-transfer pipe, not only affect volume of concrete in preformed pile, and heat-transfer pipe easily damages in centrifugal process manufacturing process, and increase the risk that reinforcing cage is corroded, thus affect bearing capacity of pile foundation and durability.Pile for prestressed pipe outer edge shape is circular, is unfavorable for that the entirety of pile body is stacked and transportation safety.These technical deficiencies and problem just, have impact on the doubt that Design of Foundation engineers uses energy piles ground source heat pump technology, finally affects applying of energy piles ground source heat pump technology.Therefore, incorporation engineering builds actual conditions, development technique rationally, bury heat-transfer pipe technology in the preformed pile of economical and efficient underground and become an extremely urgent task.
Summary of the invention
Object of the present invention is just that overcoming preformed pile reinforcing cage sidewall colligation heat-transfer pipe affects concrete compactness, the main muscle of prestressing force easily causes heat-transfer pipe to destroy when stretch-draw, easily interspace between heat-transfer pipe and reinforcing cage and cause reinforcement corrosion, it is low that colligation makes survival rate in prestressed pile process at the heat-transfer pipe of reinforcing cage sidewall in centrifugal process, round and smoothly outside common pile for prestressed pipe be unfavorable for that pile body is stacked and the technical problems such as transportation safety in a large number, a kind of construction of exploitation interference is little, technology is reasonably based on the construction method of the precast energy pile of earth source heat pump, traditional solid reinforcing bar is substituted as the main muscle of preformed pile by hollow steel pipe, heat-transfer pipe is embedded in hollow steel pipe, energy piles form can adopt single U-shaped pipe laying, dual U-shaped pipe laying, three U-shaped pipe layings, single W shape pipe laying and two W shape pipe laying form, pre-buried heat transfer bend pipe and heat-transfer pipe joint in prefabricated shoe and prefabricated pile cover, the pile body outer edge shape of pre-buried heat-transfer pipe is polygon, inner edge shape is polygon or circle.Thus effectively solve interacting between heat-transfer pipe and reinforcing cage, avoid burying underground of heat-transfer pipe to cause degradation technical barrier under pile foundation total bearing capacity.
A construction method for precast energy pile, is characterized in that: heat-transfer pipe is embedded in hollow steel pipe, and hollow steel pipe substitutes traditional solid reinforcing bar as the main muscle of preformed pile; In order to connect the heat-transfer pipe in preformed pile, pre-buried heat transfer bend pipe and heat-transfer pipe joint in prefabricated shoe and prefabricated pile cover; Energy piles form adopts single U-shaped pipe laying, dual U-shaped pipe laying, three U-shaped pipe layings, single W shape pipe laying and two W shape pipe laying form, when energy piles form be single U-shaped, dual U-shaped and single W shape time, associating hollow steel pipe and solid reinforcing bar as main muscle; When energy piles form be three U-shapeds and two W shape time, all substitute solid reinforcing bar with hollow steel pipe.
The construction method of a kind of precast energy pile of the present invention, comprises following technical step:
(1) according to designing requirement, determine pile body length, stake footpath and reinforcing cage parameter, make precast energy pile pile body, pile body is the stake of polygon pre-tensioned prestressing, when energy piles form be single U-shaped, dual U-shaped and single W shape time, associating hollow steel pipe and solid reinforcing bar as the main muscle of prestressing force; When energy piles form be three U-shapeds and two W shape time, all substitute solid reinforcing bar as the main muscle of prestressing force with hollow steel pipe, heat-transfer pipe is embedded in hollow steel pipe, and passes hollow steel pipe and reserved certain length; Pre-tensioned prestressing is applied to hollow steel pipe and the main muscle of solid reinforcing bar, and guarantees that the heat-transfer pipe of hollow steel pipe inside does not stress;
(2) the precast energy pile shoe of polygonal pyramid is made, and the heat-transfer pipe bend pipe that pre-buried arrangement form is corresponding with pile body pipe laying form in shoe and heat-transfer pipe joint;
(3) the precast energy pile pile cover of polygonal body is made, and the heat-transfer pipe bend pipe that pre-buried arrangement form is corresponding with pile body pipe laying form in pile cover and heat-transfer pipe joint;
(4) pile-forming machine perching, is connected precast energy pile shoe with precast energy pile pile body, and checks the sealing of heat-transfer pipe joint;
(5) static pressure pile-sinking, sinks to the soil body to projected depth by the precast energy pile pile body of band precast energy pile shoe;
(6) connect precast energy pile pile cover at precast energy pile pile body top, water flowing detects the validity of heat-transfer pipe loop, completes the construction of integral prefabricated energy stake.
Precast energy pile pile body of the present invention, the prestressed pile of the lateral surface polygon be made by pre-tensioned prestressing method, medial surface polygon or circle, its pile body outer shape is polygon, and the length of side is 700-1200mm; Pile body inner shape is polygon or circle, and the length of side or diameter are 400-600mm; Pile body length is 20-40m; In pile body, the main muscle of prestressing force is the combination of hollow steel pipe or hollow steel pipe and solid reinforcing bar, energy piles form can adopt single U-shaped pipe laying, dual U-shaped pipe laying, three U-shaped pipe layings, single W shape pipe laying and two W shape pipe laying form, when energy piles form be single U-shaped, dual U-shaped and single W shape time, associating hollow steel pipe and solid reinforcing bar are as main muscle, when energy piles form be three U-shapeds and two W shape time, all substitute solid reinforcing bar with hollow steel pipe; Heat-transfer pipe is buried underground in hollow steel pipe.The external diameter of hollow steel pipe is 30-60mm, and wall thickness is 5-10mm, and length is determined according to the stake of preformed pile is long, is generally 20-40m; Solid bar diameter is 15-25mm, and length is determined according to the stake of preformed pile is long, is generally 20-40m; Stirrup diameter is 6-10mm, and stirrup spacing is 200-500mm.When energy piles adopts single U-shaped pipe laying form, the main muscle of preformed pile by 2 external diameters be 30-60mm, the solid reinforcing bar of wall thickness to be the hollow steel pipe of 5-10mm and 4 diameters be 15-25mm forms, stirrup diameter is 6-10mm, stirrup spacing is 200-500mm; When energy piles adopts dual U-shaped pipe laying form, the main muscle of preformed pile by 4 external diameters be 30-60mm, the solid reinforcing bar of wall thickness to be the hollow steel pipe of 5-10mm and 2 diameters be 15-25mm forms, stirrup diameter is 6-10mm, stirrup spacing is 200-500mm; When energy piles adopts three U-shaped pipe laying forms, preformed pile reinforcing cage by 6 external diameters be 30-60mm, wall thickness is that the hollow steel pipe of 5-10mm forms, stirrup diameter is 6-10mm, stirrup spacing is 200-500mm; When energy piles adopts single W shape pipe laying form, the main muscle of preformed pile by 4 external diameters be 30-60mm, the solid reinforcing bar of wall thickness to be the hollow steel pipe of 5-10mm and 2 diameters be 15-25mm forms, stirrup diameter is 6-10mm, stirrup spacing is 200-500mm; When energy piles adopts two W shape pipe laying form, the main muscle of preformed pile by 6 external diameters be 30-60mm, wall thickness is that the hollow steel pipe of 5-10mm forms, stirrup diameter is 6-10mm, stirrup spacing is 200-500mm.
Precast energy pile shoe of the present invention is precast concrete shoe, pre-buried heat-transfer pipe bend pipe and heat-transfer pipe joint in prefabricated shoe, and pre-buried heat transfer bend pipe is corresponding with corresponding pile body pipe laying form with heat-transfer pipe joint arrangement form.
Precast energy pile pile cover of the present invention is precast concrete pile cover, pre-buried heat-transfer pipe bend pipe and heat-transfer pipe joint in prefabricated pile cover, and pre-buried heat transfer bend pipe is corresponding with corresponding pile body pipe laying form with heat-transfer pipe joint arrangement form.
Heat-transfer pipe of the present invention is polyethylene pipe, its external diameter and hollow steel pipe internal diameter tangent, be 25-50mm, wall thickness is 5-8mm, and length is 40-100m.
Advantage of the present invention and effect are: utilize hollow steel pipe to substitute solid reinforcing bar as the main muscle of preformed pile, heat-transfer pipe is embedded in hollow steel pipe, thus solve that heat-transfer pipe and main muscle colligation bury that the mutual interference, the concrete density that cause decline underground, degradation technical problem under reinforcement corrosion and pile foundation total bearing capacity.Compared with conventional heat transfer Guan Yuzhu muscle colligation pipe laying mode, the technology of the present invention pipe laying survival rate is higher, and reinforcing cage surrounding concrete compactness is high, and can guarantee that heat-transfer pipe is buried underground does not reduce pile foundation total bearing capacity simultaneously; Compared with the common pile for prestressed pipe of tradition, the polygon outer edge shape of the technology of the present invention, is conducive to solving pile body and stacks in a large number and transportation safety etc.; Compared with conventional borehole pipe laying mode, the technology of the present invention makes preformed pile manufacture craft and heat-transfer pipe burial and construction organically combine, and substantially reduces the construction period, has saved the underground space and construction costs.The method construction technology is simple, workable, is convenient to quality control, and economic benefit is obvious, and heat-transfer effect is remarkable.
Advantage of the present invention and effect also will further describe in a specific embodiment.
Accompanying drawing illustrates:
Fig. 1---list U-shaped pipe laying structure plane of arrangement schematic diagram of the present invention.
Fig. 2---dual U-shaped pipe laying structure plane of arrangement schematic diagram of the present invention.
Fig. 3---the present invention three U-shaped pipe laying structure plane of arrangement schematic diagram.
Fig. 4---list W shape pipe laying structure plane of arrangement schematic diagram of the present invention.
The two W shape pipe laying structure plane of arrangement schematic diagram of Fig. 5---the present invention.
Fig. 6---dual U-shaped pipe laying structure of the present invention arranges the longitudinal schematic diagram of pile body.
The two W shape pipe laying structure of Fig. 7---the present invention arranges the longitudinal schematic diagram of pile body.
The longitudinal schematic diagram of Fig. 8---list U-shaped of the present invention, dual U-shaped and three U-shaped pipe laying pile shoe structures.
Fig. 9---list W shape of the present invention and the longitudinal schematic diagram of two W shape pipe laying pile shoe structure.
Figure 10---list W shape of the present invention and the longitudinal schematic diagram of two W shape pipe laying pile cover structure.
In figure: 1 is polygon outside preformed pile, 2 is polygon inside preformed pile, and 3 is hollow steel pipe, and 4 is solid reinforcing bar, and 5 is stirrup, and 6 is heat-transfer pipe, and 7 is heat transfer bend pipe, and 8 is preformed pile pile body, and 9 is prefabricated shoe, and 10 is heat-transfer pipe joint, and 11 is prefabricated pile cover.
Detailed description of the invention
The specific embodiment of the present invention is described in detail below in conjunction with accompanying drawing.Protection scope of the present invention is not limited only to the description of present embodiment.
As shown in Fig. 1-Figure 10, a kind of precast energy pile, is made up of preformed pile pile body 8, prefabricated shoe 9 and prefabricated pile cover 11 3 part.The lateral surface of preformed pile pile body 8 is polygon, medial surface is polygon or circle, and the reinforcing cage in preformed pile pile body 8 is made up of hollow steel pipe 3, solid reinforcing bar 4 and stirrup 5, and heat-transfer pipe 6 is arranged in hollow steel pipe 3; Heat transfer bend pipe 7 and heat-transfer pipe joint 10 are embedded in prefabricated shoe 9; As pre-buried heat transfer bend pipe 7 and heat-transfer pipe joint 10 in the prefabricated pile cover 11 of W shape heat-transfer pipe pipe laying form.The advantage of present embodiment is heat-transfer pipe 6 to be embedded in as in the hollow steel pipe 3 of the main muscle of prestressing force, heat transfer bend pipe 7 and heat-transfer pipe joint 10 are embedded in prefabricated shoe 9 and prefabricated pile cover 11, heat-transfer pipe 6, heat transfer bend pipe 7 and heat-transfer pipe joint 10 are buried underground to make with preformed pile pile body 8, prefabricated shoe 9 and prefabricated pile cover 11 and are synchronously carried out, and burying underground of heat-transfer pipe 6 does not affect the concrete compactness of preformed pile pile body 8, do not reduce pile foundation total bearing capacity, and pipe laying survival rate is high.
Before making precast energy pile, first the strata condition intending setting pile foundation and burying earth source heat pump underground heat-transfer pipe 6 underground is verified, comprise clay distribution and the stratum thermal characteristics etc. such as mechanical characteristic, soil layer thermal energy storage amount in boundary of works area, design energy piles form, the energy piles degree of depth and the parameter such as hollow steel pipe 3 diameter, heat-transfer pipe 6 diameter; Generally, energy piles form has single U-shaped, dual U-shaped, three U-shapeds, single W shape and two W shape five kinds of forms, mainly determine according to stratum thermal energy storage amount and heat transfer efficiency, when the preformed pile pile body length of side is between 600-800mm, single U-shaped or single W shape energy piles form are selected in main consideration; When the preformed pile pile body length of side is between 800-1200mm, dual U-shaped, three U-shapeds or two W shape energy piles form are selected in main consideration; The energy piles degree of depth, long consistent with stake, also can determine according to actual formation heat energy situation; The external diameter of hollow steel pipe 3 is 30-60mm, and wall thickness is 5-10mm, and length is determined according to the length of preformed pile pile body 8; Solid reinforcing bar 4 diameter is 15-25mm, and length is determined according to the length of preformed pile pile body 8; Stirrup 5 diameter is 6-10mm, and stirrup 5 spacing is 200-500mm.Then, determine reinforcing cage: when adopting single U-shaped energy piles form, the main muscle of preformed pile pile body 8 by 2 external diameters be 30-60mm, the solid reinforcing bar 4 of wall thickness to be the hollow steel pipe 3 of 5-10mm and 4 diameters be 15-25mm forms, stirrup 5 diameter is 6-10mm, stirrup 5 spacing is 200-500mm; When adopting dual U-shaped energy piles form, the main muscle of preformed pile pile body 8 by 4 external diameters be 30-60mm, the solid reinforcing bar 4 of wall thickness to be the hollow steel pipe 3 of 5-10mm and 2 diameters be 15-25mm forms, stirrup 5 diameter is 6-10mm, stirrup 5 spacing is 200-500mm; When employing three U-shaped energy piles form, preformed pile pile body 8 reinforcing cage by 6 external diameters be 30-60mm, wall thickness is that the hollow steel pipe 3 of 5-10mm forms, stirrup 5 diameter is 6-10mm, stirrup 5 spacing is 200-500mm; When adopting single W shape energy piles form, the main muscle of preformed pile pile body 8 by 4 external diameters be 30-60mm, the solid reinforcing bar 4 of wall thickness to be the hollow steel pipe 3 of 5-10mm and 2 diameters be 15-25mm forms, stirrup 5 diameter is 6-10mm, stirrup 5 spacing is 200-500mm; When adopting two W shape energy piles form, the main muscle of preformed pile pile body 8 by 6 external diameters be 30-60mm, wall thickness is that the hollow steel pipe 3 of 5-10mm forms, stirrup 5 diameter is 6-10mm, stirrup 5 spacing is 200-500mm.Heat-transfer pipe 6 in hollow steel pipe 3 is polyethylene pipe, its external diameter and hollow steel pipe 3 internal diameter tangent, be 25-50mm, wall thickness is 5-8mm, and length is determined according to stake is long, is generally 40-100m.
When making precast energy pile, the preparation method of preformed pile pile body 8 is as follows: first, according to the pipe laying form of design, reinforcing cage is assembled in the stake mould of sided polygons 1, medial surface polygon 2 outside, comprise the radical of hollow steel pipe 3, position and length, the radical of solid reinforcing bar 4, position and length, the number of stirrup 5 and position.Then, in the hollow steel pipe 3 assembled, arrange heat-transfer pipe 6, heat-transfer pipe 6 passes hollow steel pipe 3 and reserved certain length.Then, pre-tensioned prestressing is applied to hollow steel pipe 3 and the main muscle of solid reinforcing bar 4, and guarantees that the heat-transfer pipe 6 of hollow steel pipe 3 inside does not stress.Secondly, pumping of concrete in the stake mould of external sided polygons 1, medial surface polygon 2.After concrete pumping completes, to carrying out centrifugal containing prestressed reinforcement cage and concrete stake mould, dense concrete.Finally, it is steam-cured that the pile body completed utilizing centrifugal process carries out normal pressure, then the demoulding, then it is steam-cured to carry out secondary high-pressure, completes the making of the preformed pile pile body 8 containing heat-transfer pipe.
The preparation method of prefabricated shoe 9 is as follows: first, determines the arrangement form of prefabricated shoe 9 interior conduct heat bend pipe 7 and the heat-transfer pipe joint 10 consistent with pile body heat-transfer pipe 6 pipe laying form.Secondly, the design attitude in shoe model, arrange heat transfer bend pipe 7 and heat-transfer pipe joint 10, shoe model lateral surface is polygon bullet.Then, conduct heat well in the shoe model of bend pipe 7 and heat-transfer pipe joint 10 pre-buried, concreting.Finally, after normal pressure is steam-cured, form removal, completes the making of prefabricated shoe 9.
The preparation method of prefabricated pile cover 11 is as follows: first, determines the arrangement form of prefabricated pile cover 11 interior conduct heat bend pipe 7 and the heat-transfer pipe joint 10 consistent with pile body heat-transfer pipe 6 pipe laying form.Secondly, the design attitude in pile cover model, arrange heat transfer bend pipe 7 and heat-transfer pipe joint 10, pile cover model lateral surface is polygon cylinder.Then, conduct heat well in the pile cover model of bend pipe 7 and heat-transfer pipe joint 10 pre-buried, concreting.Finally, after normal pressure is steam-cured, form removal, completes the making of prefabricated pile cover 11.
During preset energy pile driving construction, first prefabricated shoe 9 is arranged on the end of preformed pile pile body 8, and connect heat-transfer pipe 6 and heat transfer bend pipe 7 by heat-transfer pipe joint 10, pile body is squeezed in static pressure or knocking, then at preformed pile pile body 8 top, prefabricated pile cover 11 is installed, and connects heat-transfer pipe 6 and heat transfer bend pipe 7 by heat-transfer pipe joint 10.After having constructed, the feasibility of water flowing debugging heat transfer system; If existing problems, can consider to beat again in good time; If run unobstructed, complete the construction of integral prefabricated energy stake.
Claims (5)
1. a construction method for precast energy pile, comprises following technical step:
(1) according to designing requirement, determine pile body length, stake footpath and reinforcing cage parameter, make precast energy pile pile body, pile body is the stake of polygon pre-tensioned prestressing, when energy piles form be single U-shaped, dual U-shaped and single W shape time, associating hollow steel pipe and solid reinforcing bar as the main muscle of prestressing force; When energy piles form be three U-shapeds and two W shape time, all substitute solid reinforcing bar as the main muscle of prestressing force with hollow steel pipe, heat-transfer pipe is embedded in hollow steel pipe, and passes hollow steel pipe and reserved certain length; Pre-tensioned prestressing is applied to hollow steel pipe and the main muscle of solid reinforcing bar, and guarantees that the heat-transfer pipe of hollow steel pipe inside does not stress;
(2) the precast energy pile shoe of polygonal pyramid is made, and the heat-transfer pipe bend pipe that pre-buried arrangement form is corresponding with pile body pipe laying form in shoe and heat-transfer pipe joint;
(3) the precast energy pile pile cover of polygonal body is made, and the heat-transfer pipe bend pipe that pre-buried arrangement form is corresponding with pile body pipe laying form in pile cover and heat-transfer pipe joint;
(4) pile-forming machine perching, is connected precast energy pile shoe with precast energy pile pile body, and checks the sealing of heat-transfer pipe joint;
(5) static pressure pile-sinking, sinks to the soil body to projected depth by the precast energy pile pile body of band precast energy pile shoe;
(6) connect precast energy pile pile cover at precast energy pile pile body top, water flowing detects the validity of heat-transfer pipe loop, completes the construction of integral prefabricated energy stake.
2. the construction method of a kind of precast energy pile according to claim 1, it is characterized in that: described precast energy pile pile body, the prestressed pile of the lateral surface polygon be made by pre-tensioned prestressing method, medial surface polygon or circle, its pile body outer shape is polygon, and the length of side is 700-1200mm; Pile body inner shape is polygon or circle, and the length of side or diameter are 400-600mm; Pile body length is 20-40m; In pile body, the main muscle of prestressing force is the combination of hollow steel pipe or hollow steel pipe and solid reinforcing bar, energy piles form adopts single U-shaped pipe laying, dual U-shaped pipe laying, three U-shaped pipe layings, single W shape pipe laying and two W shape pipe laying form, when energy piles form be single U-shaped, dual U-shaped and single W shape time, associating hollow steel pipe and solid reinforcing bar are as main muscle, when energy piles form be three U-shapeds and two W shape time, all substitute solid reinforcing bar with hollow steel pipe; Bury heat-transfer pipe underground in hollow steel pipe, the external diameter of hollow steel pipe is 30-60mm, and wall thickness is 5-10mm, and length is 20-40m; Solid bar diameter is 15-25mm, and length is 20-40m; Stirrup diameter is 6-10mm, stirrup spacing is 200-500mm, when energy piles adopts single U-shaped pipe laying form, the main muscle of preformed pile by 2 external diameters be 30-60mm, the solid reinforcing bar of wall thickness to be the hollow steel pipe of 5-10mm and 4 diameters be 15-25mm forms, stirrup diameter is 6-10mm, stirrup spacing is 200-500mm; When energy piles adopts dual U-shaped pipe laying form, the main muscle of preformed pile by 4 external diameters be 30-60mm, the solid reinforcing bar of wall thickness to be the hollow steel pipe of 5-10mm and 2 diameters be 15-25mm forms, stirrup diameter is 6-10mm, stirrup spacing is 200-500mm; When energy piles adopts three U-shaped pipe laying forms, preformed pile reinforcing cage by 6 external diameters be 30-60mm, wall thickness is that the hollow steel pipe of 5-10mm forms, stirrup diameter is 6-10mm, stirrup spacing is 200-500mm; When energy piles adopts single W shape pipe laying form, the main muscle of preformed pile by 4 external diameters be 30-60mm, the solid reinforcing bar of wall thickness to be the hollow steel pipe of 5-10mm and 2 diameters be 15-25mm forms, stirrup diameter is 6-10mm, stirrup spacing is 200-500mm; When energy piles adopts two W shape pipe laying form, the main muscle of preformed pile by 6 external diameters be 30-60mm, wall thickness is that the hollow steel pipe of 5-10mm forms, stirrup diameter is 6-10mm, stirrup spacing is 200-500mm.
3. the construction method of a kind of precast energy pile according to claim 1, it is characterized in that: described precast energy pile shoe, for precast concrete shoe, pre-buried heat-transfer pipe bend pipe and heat-transfer pipe joint in prefabricated shoe, pre-buried heat transfer bend pipe is corresponding with corresponding pile body pipe laying form with heat-transfer pipe joint arrangement form.
4. the construction method of a kind of precast energy pile according to claim 1, it is characterized in that: described precast energy pile pile cover, for precast concrete pile cover, pre-buried heat-transfer pipe bend pipe and heat-transfer pipe joint in prefabricated pile cover, pre-buried heat transfer bend pipe is corresponding with corresponding pile body pipe laying form with heat-transfer pipe joint arrangement form.
5. the construction method of a kind of precast energy pile according to claim 1, is characterized in that: described heat-transfer pipe, is polyethylene pipe, its external diameter and hollow steel pipe internal diameter tangent, be 25-50mm, wall thickness is 5-8mm, and length is 40-100m.
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| CN103485332A (en) | 2014-01-01 |
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