CN102937211B - Vertical spiral-type buried pipe construction method for GRHP (ground source heat pump) - Google Patents
Vertical spiral-type buried pipe construction method for GRHP (ground source heat pump) Download PDFInfo
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- CN102937211B CN102937211B CN201210494997.1A CN201210494997A CN102937211B CN 102937211 B CN102937211 B CN 102937211B CN 201210494997 A CN201210494997 A CN 201210494997A CN 102937211 B CN102937211 B CN 102937211B
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Abstract
The invention discloses a vertical spiral-type buried pipe construction method for a GRHP (ground source heat pump). The method comprises the following steps of: (1) excavating a hole pile with the diameter being at least 1000mm, and vertically burying a plurality of reinforced steel bars in the protective wall of the hole pile so as to be used as a reinforced steel bar support; (2) spirally coiling at least one group of PE (poly ethylene) coil pipes on the reinforced steel bar support, and binding and fixing, wherein one ends of the PE coil pipes are provided with water inlet pipes, and the other ends of the PE coil pipes are provided with water return pipes, and the distances between the water inlet pipe and the water outlet pipe which are adjacent are greater than 500mm; and (3) pouring concrete in the hole pile. Compared with a horizontal buried pipe and a vertical single-dual U-shaped buried pipe, the vertical spiral-type buried pipe construction method provided by the invention is relatively high in ground heat energy heat exchange efficiency, saves land resources, and lowers the cost.
Description
Technical field
The present invention relates to a kind of ground source heat pump imbedded pipe method of construction, particularly the vertical spiral pipe laying method of construction of a kind of earth source heat pump.
Background technique
Ground source heat pump technology mainly utilizes the heat storing in SHALLOW CRUST building is heated and freeze, and has good energy-conservation and environmental benefit, has obtained in recent years increasingly extensive application.Earth source heat pump mode is mainly divided into groundwater heat pump technology and underground pipe heat pump techniques.The heat that groundwater heat pump technology mainly utilizes groundwater abstraction to discharge in heat pump, then recharge water table.Groundwater heat pump technology has the significantly benefit of energy-conservation and environment protection, but also has defect: will there be abundant underground water locality, if water level is lower, the power consumption of water pump will reduce the efficiency of system greatly.Underground pipe heat pump techniques is to utilize MEDIA FLOW to carry out heat exchange through being embedded in underground pipe and the earth (soil, stratum, underground water).Underground pipe heat pump techniques had both retained the advantage of groundwater heat pump technology, had avoided again its shortcoming, so underground pipe heat pump techniques becomes the leading situation in geothermal heat pump air-conditioner technology.
Underground pipe heat pump mainly comprises heating air conditioning end system in earth source heat pump unit, geothermal power exchange system and building.The pipe laying mode that in prior art, geothermal power exchange system is used is horizontal coiled pipe and vertically single double-U-shaped pipe laying, and these two kinds of embedding manners all have its deficiency.Horizontal coiled pipe construction is simple, but floor space is large, and the pipe laying depth of burying is more shallow, and geothermal power heat exchange efficiency is not high; Vertical single double-U-shaped pipe laying, U-shaped heat exchanging tube is embedded in the circular hole of diameter 150mm conventionally, for return pipe close together, for there being larger heat exchange between return pipe, causes underground heat heat exchange efficiency low.In addition, vertical single double-U-shaped pipe laying need to drill through large metering-orifice to bury U-shaped heat exchanging tube underground, and drilling depth is larger, and construction cost is high.
Summary of the invention
The object of the present invention is to provide the vertical spiral pipe laying method of construction of a kind of earth source heat pump, this vertical spiral pipe laying method of construction geothermal power heat exchange efficiency is high, and construction cost is lower.
In order to realize foregoing invention object, the invention provides following technological scheme:
The vertical spiral pipe laying method of construction of earth source heat pump, it comprises the following steps:
(1) excavated diameter is the hole stake of at least 1000mm, and vertically buries many reinforcing bars underground as Steel bar rack at the retaining wall of hole stake;
(2) at least one group of PE coil pipe coiled on Steel bar rack in the shape of a spiral, and colligation fixes, one end of PE coil pipe is intake pipe, and the other end is return pipe, and adjacent intake pipe and the distance between return pipe are greater than 500mm;
(3) in the stake of hole, build concrete.
PE coil pipe is embedded in the stake of hole in the shape of a spiral, compares with horizontal coiled pipe, and floor space is little, and thermal energy exchange rate is higher; Compare with vertical U-type pipe laying, the distance in vertical spiral pipe laying between water pipe and return pipe is greater than 500mm, has avoided the heat exchange between water pipe and return pipe, and geothermal power heat exchange efficiency is high.
Preferably, hole stake described in step (1) can be also fabric structure stake.The reinforcement cage that Steel bar rack described in step (1) can carry for fabric structure stake.Utilize the structure pile of building itself and the reinforcement cage that structure pile carries, without excavated hole stake again, also, without burying again reinforcing bar underground as support, saved significantly engineering time and cost.In addition, colligation PE coil pipe on reinforcement cage, then the reinforcement cage with PE coil pipe is positioned in structure pile, the colligation of PE coil pipe is carried out on ground, is more convenient for the colligation of PE coil pipe and buries underground.
Preferably, while carrying out the colligation of PE coil pipe in described step (2), the helix pitch of PE coil pipe is more than or equal to 100mm.
While being connected with horizontal pipe for the ease of PE coil pipe, have certain surplus, preferred, when step (2) is carried out the colligation of PE coil pipe, each organizes the intake pipe of PE coil pipe and length in reserve that return pipe exceeds Steel bar rack top is greater than 1000mm.
When using many group PE coil pipes, for convenient intake pipe and the return pipe of respectively organizing PE coil pipe of distinguishing, while connecting in pressure testing and with horizontal pipe, can make the intake pipe of each PE coil pipe corresponding one by one with return pipe, preferably, before step (2) is carried out the colligation of PE coil pipe, intake pipe and the return pipe of each group PE coil pipe are numbered.
Compared with prior art, beneficial effect of the present invention:
1, with respect to horizontal coiled pipe, the geothermal power heat exchange efficiency of the vertical spiral pipe laying method of construction of the present invention is higher, and floor space is little, more economizes the land resource.For the double-U-shaped pipe laying of vertical list, the distance in vertical spiral pipe laying between water pipe and return pipe is large (being greater than 500mm) more, avoided the heat exchange between water pipe and return pipe, and geothermal power heat exchange efficiency is high.
2, utilize the structure pile of building itself and reinforcement cage to bury PE coil pipe underground, saved the operation of holing and burying Steel bar rack underground, further reduced construction cost.And, PE coil pipe is coiled on reinforcement cage, then be embedded in structure pile, operate simplyr, working efficiency is higher.
Accompanying drawing explanation
Fig. 1 is the colligation schematic diagram of reinforcement cage and PE coil pipe in embodiment 1.
Fig. 2 is the colligation schematic diagram of Steel bar rack and PE coil pipe in embodiment 2.
Fig. 3 is the partial enlarged drawing of Steel bar rack and colligation place of PE coil pipe in Fig. 2.
Fig. 4 is the hole stake plan view of burying underground in embodiment 2 after PE coil pipe.
Reference character: 1-PE coil pipe, 2-Φ 12 reinforcing bars, 3-hole pile wall, 4-U shape clip, 5-band, 11-intake pipe, 12-return pipe, the main muscle of 21-, 22-stirrup.
Embodiment
Below in conjunction with test example and embodiment, the present invention is described in further detail.But this should be interpreted as to the scope of the above-mentioned theme of the present invention only limits to following embodiment, all technology realizing based on content of the present invention all belong to scope of the present invention.
The vertical spiral pipe laying method of construction of earth source heat pump of the present invention, comprises the following steps:
(1) excavated diameter is the hole stake of at least 1000mm, and vertically buries many reinforcing bars underground as Steel bar rack at the retaining wall of hole stake.The stake of described hole also can utilize fabric structure stake, and Steel bar rack also can utilize the reinforcement cage of fabric structure stake self.
(2) at least one group of PE coil pipe coiled on Steel bar rack or on reinforcement cage in the shape of a spiral, and colligation is fixed.When PE coil pipe is many groups, the coiling mode of PE coil pipe has multiple, for example, described many group PE coil pipes are uniformly distributed on Steel bar rack or reinforcement cage, one group of PE coil pipe coils in the shape of a spiral in one section of Steel bar rack or reinforcement cage, the helix pitch of PE coil pipe is not less than 100mm on the same group, and the helix pitch of two adjacent groups PE coil pipe is identical with the helix pitch of PE coil pipe on the same group; Again for example, described many group PE coil pipes all coil in the shape of a spiral on whole Steel bar rack or reinforcement cage, and each distance of organizing between the identical and two adjacent groups PE coil pipe of the helix pitch of PE coil pipe is not less than 100mm.One end of PE coil pipe is intake pipe, the other end is return pipe, adjacent intake pipe and the distance between return pipe are greater than 500mm, be that the intake pipe of same group of PE coil pipe and the distance between return pipe are greater than 500mm, and adjacent, from not on the same group the distance between the intake pipe of PE coil pipe (or return pipe) and return pipe (or intake pipe) be greater than 500mm.When PE coil pipe is two groups or more, before colligation PE coil pipe, first intake pipe and the return pipe of each group PE coil pipe are numbered, during colligation, the helix pitch of PE coil pipe is more than or equal to 100mm, and the length in reserve that the intake pipe of PE coil pipe and return pipe all exceed Steel bar rack or reinforcement cage top is greater than 1000mm.
(3) in the stake of hole, build concrete.
The depth of burying of horizontal coiled pipe is more shallow, and pipe laying layer soil body temperature is subject to surface temperature variable effect large (lifting with surface temperature lifting), therefore its heat exchange efficiency is not high.With respect to horizontal coiled pipe, the pipe laying depth of the vertical spiral pipe laying method of construction of the present invention is larger, and geothermal power heat exchange efficiency is higher, and floor space is little, more economizes the land resource.
The construction of vertical U shape pipe laying, generally in the Circular Tube With Hole of 150mm diameter, to lay for return pipe (being intake pipe and return pipe), too near for return pipe distance, for between return pipe, heat exchange occurring, and along with the increase of the depth of burying, its water supply return pipe overlap region is strengthened gradually, for the heat exchange between return pipe, also strengthen gradually, cause supplying return pipe less in the temperature difference at floor outlet place, so heat exchange efficiency is not high.For the U-shaped pipe laying of vertical list, the distance in vertical spiral pipe laying between water pipe and return pipe is large (being greater than 500mm) more, avoided the heat exchange between water pipe and return pipe, and geothermal power heat exchange efficiency is high.
Yi Mou library earth-source hot-pump system is constructed as example further elaborates the vertical spiral pipe laying method of construction of earth source heat pump of the present invention, and this project overall floorage is 59539 square meters, basement building area 6252 square meters, totally 170 of engineering structure stakes.In this project, adopted vertical spiral pipe laying method of construction provided by the invention.According to designing requirement, in this project, need 204 of heat-exchanging piles, in 170 fabric structure stakes, there are 125 root architecture stakes can meet pipe laying requirement, so this 125 root architecture stake doubles as heat-exchanging pile, the vertical spiral pipe laying method of construction that adopts embodiment 1 to provide is carried out pipe laying construction, excavate in addition 79 root hole stakes as pure heat-exchanging pile, the vertical spiral pipe laying method of construction that adopts embodiment 2 to provide is carried out pipe laying construction again.The hold concurrently diameter of heat-exchanging pile of 125 root architecture stakes is 1.2 meters to 2 meters, and the diameter of pure heat-exchanging pile is 2 meters.In these 204 heat-exchanging piles, what the degree of depth was the most shallow is 2 meters, and the darkest is 38 meters, and every heat-exchanging pile has been arranged 1 to 13 group of PE coil pipe according to its degree of depth and stake footpath, and coil pipe amounts to 854 groups, and every group of coil lengths is 126 meters, and amounting to PE coil lengths is 107604 meters.Through the check of one-year age, 4 earth source heat pump heat exchanger systems of this project keep the working pressure of 0.4MPa always, and ne-leakage phenomenon, and circulating water flow and supply backwater temperature difference meet designing requirement, use actual effect all to reach designing requirement.
Embodiment 1
The vertical spiral pipe laying method of construction of earth source heat pump that the present embodiment provides comprises step:
(1) finishing structure pile: detect the stake of building self structure and whether meet the demands: structure pile diameter permissible error+10mm, the perpendicularity permissible error of structure pile is less than 3 ‰ of hole pile length, repairs and makes to reach requirement for the hole stake not meeting the demands.Concrete, in this project, wherein the degree of depth of 45 root architecture stakes or structure pile diameter do not meet pipe laying requirement, therefore give up; Other 125 can be used as heat-exchanging pile use, thus the double heat-exchanging pile of doing of this 125 root architecture stake, for burying PE coil pipe underground.This 125 root architecture stake is held concurrently in heat-exchanging pile, and wherein the hold concurrently perpendicularity of heat-exchanging pile of 13 root architecture stakes does not meet the demands, therefore it is repaired, rejects unnecessary concrete on structure pile retaining wall, makes it reach 3 ‰ the requirement that perpendicularity permissible error is less than hole pile length.
(2) finishing reinforcement cage: the reinforcement cage that fabric structure stake carries is formed by the main muscle 21 of vertical direction and the 22 colligation braidings of the stirrup of substantially horizontal, detect and repair the colligation spacing of reinforcement cage, make distance between adjacent two stirrups 22 of reinforcement cage meet pipe laying and require (with reference to figure 1).In this project, reinforcement cage meets pipe laying requirement, thus at pipe laying work progress without repairing again.
Generally, reinforcement cage is that structure hole stake self is all, make, without repeating again, make, but in particular cases, for example, when the reinforcement cage of having made does not meet the demands (while not meeting design requirement as adjacent two spacing of stirrups, as required 22 spacing of adjacent two stirrup to be not less than 100mm in the present embodiment engineering) time, need to adjust (reduce or strengthen) PE coil pipe colligation spacing, make it be not less than 100mm.
In order to guarantee that colligation that PE coil pipe can be firm is on reinforcement cage, conventionally by PE coil pipe, the stirrup 22 along reinforcement cage coils on reinforcement cage, and together with main muscle 21 or stirrup 22 colligations, so need to according to pipe laying, require (being the helix pitch of PE coil pipe) to repair the spacing of 22 of the stirrups of reinforcement cage.Certainly PE coil pipe can be not coil on reinforcement cage along the stirrup 22 of reinforcement cage yet, just needn't repair the spacing of 22 of the stirrups of reinforcement cage yet.
(3) colligation PE coil pipe: the structure pile of different depth and the different-diameter heat-exchanging pile of holding concurrently needs not several on the same group PE coil pipes, but PE coil pipe is at least one group, when using many group PE coil pipes, for convenient intake pipe 11 and the return pipe 12 of respectively organizing PE coil pipe of distinguishing, while connecting in pressure testing and with horizontal pipe, can make the intake pipe 11 of each PE coil pipe corresponding one by one with return pipe 12, carry out before the colligation of PE coil pipe, intake pipe 11 and the return pipe 12 that need to organize PE coil pipe are numbered each, as No.-7, water inlet, backwater-No. 7.
With reference to figure 1, while carrying out the colligation of PE coil pipe, PE coil pipe evenly coils on reinforcement cage in the shape of a spiral, and helix pitch is not less than 100mm.When PE coil pipe is many groups, described many group PE coil pipes are uniformly distributed on reinforcement cage, one group of PE coil pipe coils in the shape of a spiral in one section of reinforcement cage, and the helix pitch of PE coil pipe is not less than 100mm on the same group, and the helix pitch of two adjacent groups PE coil pipe is identical with the helix pitch of PE coil pipe on the same group.Adjacent intake pipe 11 or the distance between return pipe 12 should be greater than 500mm, avoid, between intake pipe 11 and return pipe 12, heat exchange occurs, and reduce geothermal power exchange rate.During practice of construction, common way is: each intake pipe 11 of organizing PE coil pipe is positioned at a side of reinforcement cage, return pipe 12 is positioned at the opposite side that reinforcement cage is relative with intake pipe 11, be that (it is to be at least 1000mm that the diameter of hole stake requires for the intake pipe 11 of PE coil pipe and the two ends that return pipe 12 lays respectively at the same diameter of reinforcement cage, in the present embodiment, structure pile hold concurrently heat-exchanging pile diameter minimum be 1200mm, the diameter of reinforcement cage is greater than 1000mm, so the intake pipe 11 of PE coil pipe and return pipe 12 lay respectively at the two ends of the same diameter of reinforcement cage, satisfied distance is greater than the requirement of 500mm), and two adjacent groups PE coil pipe, wherein the intake pipe 11 of one group of PE coil pipe is greater than 500mm with the distance of the return pipe 12 of another group PE coil pipe.While being connected with horizontal pipe for the ease of PE coil pipe, have certain surplus, each organizes the intake pipe 11 of PE coil pipe and length in reserve that return pipe 12 all exceeds reinforcement cage top is not less than 1000mm.
(4) reinforcement cage is placed in lifting: in order to guarantee that reinforcing bar cage hoisting can carry out smoothly, before carrying out reinforcing bar cage hoisting placement, checks the flatness of the perpendicularity of hole stake, aperture, retaining wall, to processing in time of not meeting the demands; Check and to adjust intake pipe 11 and the return pipe of PE coil pipe in place by designing requirement direction simultaneously, again coiling there is is the reinforcement cage of PE coil pipe slowly to put into the structure pile hole stake of holding concurrently, in put procedure, avoid PE coil pipe and structure pile hold concurrently retaining wall collision or the friction of hole stake, forbid to allow reinforcement cage free fall.
(5) pressure testing voltage stabilizing and concrete are built: coiling is carried out the hydrostatic test to every group of PE coil pipe respectively after having the reinforcement cage of PE coil pipe to install, and when working pressure is less than or equal to 1.0MPa, PE coil pipe hydraulic pressure should be 1.5 times of working pressure and is not less than 0.6Mpa; When working pressure is greater than 1.0MPa, PE coil pipe hydraulic pressure should be working pressure and adds 0.5MPa, voltage stabilizing 15min at least during test, and after voltage stabilizing, PE coil pipe hydraulic pressure Pressure Drop should be not more than 3%, and without leakage phenomenon; PE coil pipe hydraulic pressure is unloaded to the 15min at least of voltage stabilizing after working pressure, after voltage stabilizing, PE coil pipe hydraulic pressure Pressure Drop should be not more than 3% again, and without leakage phenomenon.At concrete, build and carry out between curing time Pressure testing record; After pressure testing voltage stabilizing is qualified, carrying out concrete builds again.Generally, before concrete is built, first carry out pressure testing voltage stabilizing test, for the underproof situation of pressure testing voltage stabilizing, ascertain the reason, to make in time respective handling.For example, if pressure gauge damages, carry out again pressure testing voltage stabilizing after should again changing pressure gauge; PE coil pipe if structure pile is held concurrently in heat-exchanging pile damages and leaks, and this group PE coil pipe leaking should be cancelled, and in other heat-exchanging piles, newly-increased PE coil pipe is supplemented in addition, needs to re-start heat calculation simultaneously, and horizontal pipe is readjusted.In pressure testing voltage stabilizing process, the water of take is tested as medium, and hydraulic pressure medium can not have impurity, and the hydrostatic test should adopt hydraulic test pump slowly to boost, and O&E at any time in the process of boosting, must not have seepage; Be not able to pneumatic test and replace the hydrostatic test.
In concrete casting process, all structure piles heat-exchanging pile concrete of holding concurrently all adopts commerical ready-mixed concrete, and with transfer pump, to the structure pile pumping in heat-exchanging pile of holding concurrently, concrete discharging adopts tumbling barrel, if when underground water is large, adopts tremie concreting construction process under water.Concrete is answered continuous stratification pouring, and every layer of pouring height must not surpass 750mm, is poured onto for the first time the end face that expands position, bottom, and the pile body of vibration compacting, then placement layer by layer immediately, until stake top.In concreting process, concrete tamper is when making firm by ramming concrete, and concrete tamper should forbid concrete tamper to contact reinforcement cage or PE coil pipe from reinforcement cage or more than PE coil pipe 200mm, forbids delivery pump pipe directly to rush at mounted PE coil pipe.If while finding that in casting process coil pipe has landing situation, should stop immediately building, after waiting to rectify and improve, can continue to build.
At heat-exchanging pile concrete, build after end, also need to carry out pressure testing voltage stabilizing test, if find that hydraulic pressure sharply declines, should find out the reason of pressure drop, and carry out respective handling.See to be whether that PE coil pipe tail end plugs is tight or pressure gauge damages or PE coil pipe damages and leaks, if PE coil pipe tail end plugs is tight or pressure gauge damages, again shutoff or change pressure gauge after carry out again pressure testing voltage stabilizing; PE coil pipe if structure pile is held concurrently in heat-exchanging pile damages and leaks, and this group PE coil pipe leaking should be cancelled, and in other heat-exchanging piles, newly-increased PE coil pipe is supplemented in addition, needs to re-start heat calculation simultaneously, and horizontal pipe is readjusted.
Embodiment 2
The vertical spiral pipe laying method of construction of earth source heat pump that the present embodiment provides comprises step:
(1) excavate heat-exchanging pile: according to design specification, excavate heat-exchanging pile, the diameter of heat-exchanging pile is 2 meters.Heat-exchanging pile digging technology is very ripe, repeats no more herein.
(2) make Steel bar rack: in the retaining wall surrounding of hole stake, bury Φ 12 reinforcing bars 2 underground as Steel bar rack, the spacing of burying underground of Φ 12 reinforcing bars 2 is not more than 700mm, and Φ 12 reinforcing bar 2 use U-shaped clips 4 are fixed on the retaining wall 3 of hole stake, and the spacing of U-shaped clip 4 is not more than 2000mm.Bury underground in the process of Φ 12 reinforcing bars 2, if heat-exchanging pile is darker, when Φ 12 reinforcing bar 2 can not be from stake end stretch to stake mouthful, should adopt overlapping mode to connect, its lap length is not less than 15 times of Φ 12 reinforcing bar 2 diameters, in same cross section, the overlap joint area of Φ 12 reinforcing bars should not surpass 50%, with reference to figure 3.
(3) colligation PE coil pipe: the structure pile of the different depth heat-exchanging pile of holding concurrently needs not several on the same group PE coil pipes 1, but is at least a group, carries out before 1 colligation of PE coil pipe, and intake pipe and the return pipe that need to organize PE coil pipe 1 are numbered each, as No.-1, water inlet, backwater-No. 1.
Referring to figs. 2 to Fig. 4, while carrying out 1 colligation of PE coil pipe, PE coil pipe 1 evenly coils on Steel bar rack in the shape of a spiral, and with band 5 colligations, coils spacing (being spacing spiral) and be not less than 100mm.The coil pipe of PE shown in Fig. 31 is intake pipe or the outlet pipe part of PE coil pipe 1, is provided with cushion block (not indicating in figure) between the intake pipe of PE coil pipe 1 or outlet pipe portion and Steel bar rack.When PE coil pipe 1 is many groups, described many group PE coil pipes 1 are uniformly distributed on Steel bar rack, one group of PE coil pipe 1 coils in the shape of a spiral in one section of Steel bar rack, the helix pitch of PE coil pipe 1 is not less than 100mm on the same group, and the helix pitch of two adjacent groups PE coil pipe 1 is identical with the helix pitch of PE coil pipe 1 on the same group.Adjacent intake pipe 11 or the distance between return pipe 12 should be greater than 500mm, avoid, between intake pipe 11 and return pipe 12, heat exchange occurs, and reduce geothermal power exchange rate.During practice of construction, common way is: each intake pipe 11 of organizing PE coil pipe is positioned at a side of hole stake, return pipe 12 is positioned at first right opposite side of hole stake and intake pipe, be that (it is to be at least 1000mm that the diameter of hole stake requires for the intake pipe 11 of PE coil pipe and the two ends that return pipe 12 lays respectively at the same diameter of hole stake, in the present embodiment, stake diameter in hole is 2000mm, so the intake pipe 11 of PE coil pipe and return pipe 12 lay respectively at the two ends of the same diameter of hole stake, satisfied distance is greater than the requirement of 500mm), and two adjacent groups PE coil pipe, wherein the intake pipe 11 of one group of PE coil pipe is greater than 500mm with the distance of the return pipe 12 of another group PE coil pipe.While being connected with horizontal pipe for the ease of PE coil pipe 1, have certain surplus, each organizes the intake pipe of PE coil pipe 1 and length in reserve that return pipe all exceeds Steel bar rack top is not less than 1000mm.
Construction reinforced bar support and when PE coil pipe 1 is installed in heat-exchanging pile, when the heat-exchanging pile degree of depth is less than 5 meters, application trestle ladder or processing Special ladder are as construction scaffolding; When the heat-exchanging pile degree of depth is greater than 5 meters, application steel pipe is set up well cabinet frame as construction scaffolding so that construct and guarantee construction safety.
(4) pressure testing voltage stabilizing and concrete are built: after PE coil pipe 1 installs, respectively every group of PE coil pipe 1 carried out to the hydrostatic test.When working pressure is less than or equal to 1.0MPa, the hydraulic pressure of PE coil pipe 1 should be 1.5 times of working pressure and is not less than 0.6Mpa; When working pressure is greater than 1.0MPa, the hydraulic pressure of PE coil pipe 1 should be working pressure and adds 0.5MPa, voltage stabilizing 15min at least during test, and after voltage stabilizing, PE coil pipe hydraulic pressure Pressure Drop should be not more than 3%, and without leakage phenomenon; The hydraulic pressure of PE coil pipe 1 is unloaded to the 15min at least of voltage stabilizing after working pressure, after voltage stabilizing, the hydraulic pressure Pressure Drop of PE coil pipe 1 should be not more than 3% again, and without leakage phenomenon.At concrete, build and carry out between curing time Pressure testing record; After pressure testing voltage stabilizing is qualified, carrying out concrete builds again.If pressure testing voltage stabilizing is defective, detect and cause the underproof reason of pressure, and make corresponding processing, for example, if pressure gauge damages, carry out again pressure testing voltage stabilizing after should again changing pressure gauge; If the PE coil pipe in heat-exchanging pile 1 damages, leak, this group PE coil pipe leaking 1 should be cancelled, in other heat-exchanging piles, newly-increased PE coil pipe 1 is supplemented in addition, needs to re-start heat calculation simultaneously, and horizontal pipe is readjusted.In pressure testing voltage stabilizing process, the water of take is tested as medium, and hydraulic pressure medium can not have impurity, and the hydrostatic test should adopt hydraulic test pump slowly to boost, and O&E at any time in the process of boosting, must not have seepage; Be not able to pneumatic test and replace the hydrostatic test.
In concrete casting process, all heat-exchanging pile concrete all adopt commerical ready-mixed concrete, and with transfer pump, to the structure pile pumping in heat-exchanging pile of holding concurrently, concrete discharging adopts tumbling barrel, if when underground water is large, adopts tremie concreting construction process under water.Concrete is answered continuous stratification pouring, and every layer of pouring height must not surpass 750mm, is poured onto for the first time the end face that expands position, bottom, and the pile body of vibration compacting, then placement layer by layer immediately, until stake top.In concreting process, concrete tamper is when making firm by ramming concrete, and concrete tamper should forbid concrete tamper to contact Steel bar rack or PE coil pipe 1 from Steel bar rack or more than PE coil pipe 200mm, forbids delivery pump pipe directly to rush at mounted PE coil pipe 1.If while finding that in casting process coil pipe has landing situation, should stop immediately building, after waiting to rectify and improve, can continue to build.
At heat-exchanging pile concrete, build after end, if find that hydraulic pressure sharply declines, should find out the reason of pressure drop, and carry out respective handling.See to be whether that the tail end plugs of PE coil pipe 1 is tight or pressure gauge damages or PE coil pipe 1 damages and leaks, if the tail end plugs of PE coil pipe 1 is tight or pressure gauge damages, again shutoff or change pressure gauge after carry out again pressure testing voltage stabilizing; If the PE coil pipe in heat-exchanging pile 1 damages, leak, this group PE coil pipe leaking 1 should be cancelled, in other heat-exchanging piles, newly-increased PE coil pipe 1 is supplemented in addition, needs to re-start heat calculation simultaneously, and horizontal pipe is readjusted.
In this project, first utilize the vertical spiral pipe laying method of construction of earth source heat pump of the present invention, PE coil pipe is embedded in the structure pile of building self, in the degree of depth of structure pile, can not meet and bury underground while requiring, just consider again that the pure heat-exchanging pile of excavation carries out heat exchange in addition, for horizontal coiled pipe and vertical U-type pipe laying, the operation of having omitted and dug stake, burying Steel bar rack underground, greatly reduce cost, operation is simultaneously easier, has improved efficiency of construction.
The vertical spiral pipe laying method of construction of the present invention, hole stake diameter is greater than 1000mm, and hole stake is by hand digging, and without main equipment, applicability is strong, is widely used, and construction cost is lower, and technology maturation, simple and quick, safe and reliable.
The vertical spiral pipe laying method of construction of earth source heat pump of the present invention can be used for all kinds of buildings such as factory, station, market, hotel, office, entertainment places, residential quarters, pollution-free, energy saving.
Claims (5)
1. the vertical spiral pipe laying method of construction of earth source heat pump, is characterized in that, the method comprises the following steps:
(1) excavated diameter is the hole stake of at least 1000mm, and vertically buries many reinforcing bars underground as Steel bar rack at the retaining wall of hole stake;
(2) at least one group of PE coil pipe coiled in the shape of a spiral on Steel bar rack, and colligation is fixed, when PE coil pipe is many groups, the coiling mode of PE coil pipe has multiple, described many group PE coil pipes are uniformly distributed on Steel bar rack, one group of PE coil pipe coils in the shape of a spiral in one section of Steel bar rack, and the helix pitch of PE coil pipe is not less than 100mm on the same group, and the helix pitch of two adjacent groups PE coil pipe is identical with the helix pitch of PE coil pipe on the same group; Or described many group PE coil pipes all coil in the shape of a spiral on whole Steel bar rack, each distance of organizing between the identical and two adjacent groups PE coil pipe of the helix pitch of PE coil pipe is not less than 100mm; One end of PE coil pipe is intake pipe, and the other end is return pipe, and adjacent intake pipe and the distance between return pipe are greater than 500mm;
(3) pressure testing voltage stabilizing and concrete are built:
Coiling is carried out the hydrostatic test to every group of PE coil pipe respectively after having the Steel bar rack of PE coil pipe to install, and when working pressure is less than or equal to 1.0MPa, PE coil pipe hydraulic pressure should be 1.5 times of working pressure and is not less than 0.6Mpa; When working pressure is greater than 1.0 MPa, PE coil pipe hydraulic pressure should be working pressure and adds 0.5MPa, voltage stabilizing 15min at least during test, and after voltage stabilizing, PE coil pipe hydraulic pressure Pressure Drop should be not more than 3%, and without leakage phenomenon; PE coil pipe hydraulic pressure is unloaded to the 15min at least of voltage stabilizing after working pressure, after voltage stabilizing, PE coil pipe hydraulic pressure Pressure Drop should be not more than 3% again, and without leakage phenomenon; After pressure testing voltage stabilizing is qualified, carrying out concrete builds; At concrete, build after end, again carry out pressure testing voltage stabilizing test, as found, hydraulic pressure sharply declines, and need find out the reason of pressure drop, and carry out respective handling.
2. the vertical spiral pipe laying method of construction of earth source heat pump according to claim 1, is characterized in that, hole stake described in step (1) is fabric structure stake.
3. the vertical spiral pipe laying method of construction of earth source heat pump according to claim 2, is characterized in that, described in step (1), Steel bar rack is the reinforcement cage that fabric structure stake carries.
4. the vertical spiral pipe laying method of construction of earth source heat pump according to claim 3, is characterized in that, while carrying out the colligation of PE coil pipe in described step (2), the length in reserve that the intake pipe of PE coil pipe and return pipe exceed Steel bar rack top is greater than 1000 mm.
5. the vertical spiral pipe laying method of construction of earth source heat pump according to claim 4, it is characterized in that, in described step (2), carry out before the colligation of PE coil pipe, when PE coil pipe is two groups or more, intake pipe and the return pipe of each group PE coil pipe are numbered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210494997.1A CN102937211B (en) | 2012-11-28 | 2012-11-28 | Vertical spiral-type buried pipe construction method for GRHP (ground source heat pump) |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210494997.1A CN102937211B (en) | 2012-11-28 | 2012-11-28 | Vertical spiral-type buried pipe construction method for GRHP (ground source heat pump) |
Publications (2)
| Publication Number | Publication Date |
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| CN102937211A CN102937211A (en) | 2013-02-20 |
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| CN103968607B (en) * | 2014-05-23 | 2016-04-06 | 重庆大学 | A kind of ground heat exchanger for geothermal heat pump air-conditioning system |
| CN104695431A (en) * | 2015-03-18 | 2015-06-10 | 刘军发 | Screw pile |
| CN106015732A (en) * | 2016-08-16 | 2016-10-12 | 陈泳东 | Buried pipe stretcher |
| CN106595338B (en) * | 2016-12-27 | 2018-10-12 | 滨州市甲力太阳能科技有限公司 | A kind of coil exchanger |
| CN109881669B (en) * | 2019-03-11 | 2023-09-19 | 浙江大学城市学院 | Plastic sleeve energy pile structure and construction method |
| CN110145897B (en) * | 2019-06-03 | 2021-05-28 | 广州美德菱能源设备有限公司 | Automatic pipe penetrating device for heat pump |
| CN110806032A (en) * | 2019-10-28 | 2020-02-18 | 春意环境科技有限公司 | Method for installing and drawing lower pipe of ground source heat pump pipe |
| CN111188332A (en) * | 2020-03-04 | 2020-05-22 | 中铁建设集团有限公司 | Large-diameter artificial hole digging cold accumulation and heat exchange hollow pile and construction method |
| CN112324990A (en) * | 2020-10-29 | 2021-02-05 | 中国三冶集团有限公司 | Method and structure for reinforcing underground straight buried pipe |
| CN113217704B (en) * | 2021-04-13 | 2022-12-02 | 浙江万合能源环境科技有限公司 | Accurate positioning and embedding method for vertical embedded pipe for natural underground operation |
| CN113373922A (en) * | 2021-07-02 | 2021-09-10 | 宁波中淳高科股份有限公司 | Geothermal energy pile construction equipment and construction method thereof |
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| CN102733375A (en) * | 2012-06-29 | 2012-10-17 | 上海建工二建集团有限公司 | Pipe pile cap joint of cast-in-place pile pre-buried ground source heat pump |
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