CN216275628U - Long auger drilling pressure irrigation energy pile structure - Google Patents
Long auger drilling pressure irrigation energy pile structure Download PDFInfo
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- CN216275628U CN216275628U CN202120945641.XU CN202120945641U CN216275628U CN 216275628 U CN216275628 U CN 216275628U CN 202120945641 U CN202120945641 U CN 202120945641U CN 216275628 U CN216275628 U CN 216275628U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
Abstract
The utility model provides a long spiral drilling pressure irrigation energy pile structure, relates to geotechnical engineering foundation engineering technical field for solve current filling type energy pile and can produce a large amount of mud, the while construction process is complicated, inefficiency, and the higher technical problem of cost. In the long spiral drilling pressure irrigation energy pile structure, a heat exchange pipeline is arranged along the vertical direction of the steel reinforcement cage, and the heat exchange pipeline is bound and connected with the main reinforcement in a double-U-shaped distribution mode; the top end and the bottom end of the heat exchange pipeline are connected through an elbow, and a V-shaped baffle which is connected with the main rib and has the height and the width respectively larger than the elbow is arranged below the elbow at the bottom end; the reinforcement stirrup is provided with a transverse steel bar for separating the heat exchange pipeline and the low-frequency vibration device; a steel sleeve is arranged at the inlet and outlet sections of the heat exchange pipeline, and foam rubber is filled between the steel sleeve and the heat exchange pipeline; two interfaces of the heat exchange pipeline are respectively connected with a pressure gauge and a valve, and the valve is used for connecting an air pressurizing device.
Description
Technical Field
The utility model relates to the technical field of foundation engineering of geotechnical engineering, in particular to a long spiral drilling pressure irrigation energy pile structure.
Background
At present, the economic development of China is rapid, the energy demand is large, and the development and utilization of new energy are urgent to relieve the problem of energy shortage.
The shallow geothermal energy is an invisible natural resource accumulated underground (0-200 m) and is a product of the combined action of heat conduction and heat convection at the deep part of the earth and solar radiation. The ground temperature below the buried depth of 10-15 m is basically constant throughout the year: 10-15 ℃ (northern China or Europe) and 20-25 ℃ (southern China or tropical zone), belongs to renewable green energy, and has the characteristics of high geological environment and underground water recovery speed, no pollution to the atmosphere, high energy utilization rate and the like. The utilization value of the shallow geothermal energy lies in that a relatively constant temperature in the shallow stratum has a large reverse temperature difference with the external air in winter and summer, and the temperature difference is the potentially available heat energy: the winter is a heat source, and the summer is a cold source.
Specifically, the traditional shallow geothermal energy development and utilization technology is a drilling and pipe burying underground heat exchanger, however, the drilling and pipe burying underground heat exchanger is large in occupied area and high in cost, and needs to be completed before construction of a pile foundation, so that the working time is long, and the construction progress is greatly influenced. In order to break through the difficulties, the energy pile technology is developed, the energy pile technology integrates a closed heat exchange loop into a pile foundation, and compared with a drilled and buried pipe heat exchanger, the drilling link is reduced, the land and the cost are saved, and the energy-saving and emission-reducing device has remarkable and higher technical economy and energy-saving and emission-reducing values.
In the prior art, the pile type of the energy pile mainly comprises a precast pile and a cast-in-place pile; precast piles are less used because they may cause damage to the heat transfer system during transportation and driving; the most widely applied construction process in the cast-in-place pile is the slurry retaining wall pore-forming cast-in-place pile. Practice shows that the slurry wall-protecting pore-forming cast-in-place pile is mature in process and can better protect a heat transfer system, but a plurality of problems exist at the same time:
for example, a large amount of slurry is generated, the construction process is complicated, the efficiency is low (hole forming → steel bar cage lowering → guiding pipe lowering → concrete pouring → guiding pipe pulling → pile forming), and the cost is high.
Disclosure of Invention
The utility model aims to provide a long spiral drilling pressure-filling energy pile structure and a construction method thereof, which are used for solving the technical problems that the existing filling type energy pile can generate a large amount of slurry, and meanwhile, the construction process is complex, the efficiency is low, and the manufacturing cost is high.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a long auger drilling pressure irrigation energy pile structure, comprising: the reinforcement cage is positioned in the pile hole and comprises a plurality of main reinforcements which are vertically distributed, a plurality of circumferential reinforcement stirrups and spiral stirrups which are wound on the main reinforcements and spirally distributed are distributed on the inner sides of the main reinforcements, and the reinforcement stirrups and the spirally distributed spiral stirrups are bound and mutually fixed with the main reinforcements;
a heat exchange pipeline is arranged along the vertical direction of the reinforcement cage and is bound and connected with the main reinforcement in a double-U-shaped distribution mode; the top end and the bottom end of the heat exchange pipeline are connected through an elbow, a V-shaped baffle connected with the main rib is arranged below the elbow at the bottom end of the heat exchange pipeline, and the height and the width of the V-shaped baffle are respectively greater than those of the elbow; the reinforcement stirrup is provided with a transverse steel bar, and the transverse steel bar is used for separating the heat exchange pipeline and the low-frequency vibration device; a steel sleeve is arranged in the area, close to the top end of the steel reinforcement cage and extending out of the steel reinforcement cage, of the heat exchange pipeline, and foam rubber is filled between the steel sleeve and the heat exchange pipeline; two interfaces of the heat exchange pipeline are respectively connected with a pressure gauge and a valve, and the valve is used for connecting an air pressurizing device.
During practical application, the heat exchange pipeline adopts the form that two U types distribute and four adjacent main muscle carry out the ligature connection through the plastics ribbon.
The heat exchange pipeline is made of steel, and the inner surface and the outer surface of the steel pipe are provided with anticorrosive coatings.
Specifically, the anti-friction agent is uniformly coated on the anti-corrosion layer on the outer surface of the heat exchange pipeline, and the thickness of the anti-friction agent layer is larger than 1 mm.
Furthermore, two interfaces of the elbow are distributed in 180 degrees, and the elbow is in butt joint with the heat exchange pipeline in a threaded connection mode.
Furthermore, the V-shaped baffle is made of steel materials, reinforcing steel bars are arranged inside the V-shaped baffle, and the reinforcing steel bars and the V-shaped baffle are connected with the main ribs in a welding mode.
Still further, the spiral stirrup adopts smooth round steel bar.
During practical application, a plurality of steel bar protection brackets are arranged at equal intervals along the vertical direction of the steel bar cage.
The energy pile is used as a foundation pile, and the steel sleeve is used for protecting the heat exchange pipeline during the construction of a later bearing platform; and/or the energy pile is used as a support pile, and the steel sleeve is used for protecting the heat exchange pipeline in later-stage crown beam construction.
Compared with the prior art, the long spiral drilling pressure-filling energy pile structure has the following advantages:
1. the insertion quality of the energy pile and the reinforcement cage thereof is ensured, and the damage of a heat exchange loop in the construction process is greatly reduced;
2. compared with the most commonly used slurry wall-protecting and pore-forming cast-in-place pile at present, the method has the following remarkable advantages: (1) the method is environment-friendly, the long spiral drilling and pressure grouting process does not have slurry, and the slurry wall protection hole-forming cast-in-place pile process can generate a large amount of slurry; (2) the method has the advantages that the method is high in efficiency, long spiral hole forming, pouring and pile forming are integrated (hole forming → poured concrete → lower steel reinforcement cage → pile forming), and the pile forming efficiency is higher compared with a slurry wall protection hole forming and poured pile process (hole forming → lower steel reinforcement cage → lower guide pipe → poured concrete → pipe drawing → pile forming); (3) the manufacturing cost is lower than the process of forming the hole filling pile by the slurry retaining wall;
3. the heat exchange pipeline is bound on the main rib in a double-U-shaped distribution mode instead of spiral binding, so that the heat exchange pipeline, the main rib and the direction in which the reinforcement cage is inserted into the pile body are straight, the friction resistance of the concrete to the heat exchange pipeline is greatly reduced, and the integrity of the heat exchange pipeline is effectively improved; in addition, the heat exchange pipeline can be bound and connected with the adjacent main ribs through plastic bands in a double-U-shaped distribution mode, and the connection mode belongs to flexible connection, so that the phenomenon that the heat exchange pipeline is deformed due to the deformation of the main ribs is effectively avoided, and the service life of the heat exchange pipeline is prolonged; (ii) a Moreover, the V-shaped baffle is arranged at the bottom end part of the heat exchange pipeline, so that the resistance of concrete to the heat exchange pipeline can be reduced to a greater extent in the process of inserting the reinforcement cage;
4. the heat exchange pipeline is pressurized, when the pressure displayed by a pressure gauge is 0.8MPa, the valve is closed, the heat exchange pipeline is constructed under pressure, and whether the heat exchange pipe is damaged or not can be mastered constantly in the process of lowering the reinforcement cage; in addition, a transverse steel bar is arranged on the reinforcing stirrup and used for separating the heat exchange pipeline from the low-frequency vibration device, so that the heat exchange pipeline is effectively prevented from being extruded and damaged due to the deviation of the low-frequency vibration device during working; the steel sleeve is arranged at the inlet and outlet sections of the heat exchange pipeline, so that the heat exchange pipeline can be effectively protected during post pile picking head and cushion cap or crown beam construction, and meanwhile, foam rubber is filled between the steel sleeve and the heat exchange pipeline, so that the port of the steel sleeve can be effectively prevented from scratching the heat exchange pipeline;
5. the heat exchange pipeline is uniformly coated with the antifriction agent, so that the lateral friction resistance of the concrete to the heat exchange pipeline is effectively reduced;
6. after the foundation pit is backfilled, the energy pile prepared by the traditional process is changed into a waste pile; the energy pile formed by the process can be used for foundation piles and supporting piles.
A construction method of a long spiral drilling pressure irrigation energy pile structure comprises the following steps:
positioning a drilling machine: the field is ensured to be flat and stable, the vertical deviation of the drill rod is checked by a specially-assigned person through a line cone or a theodolite, the verticality of the drill rod is controlled by two-way 90 degrees, and meanwhile, the pile position deviation condition is checked, so that the inclination movement is avoided in the construction, and the drill can be drilled after the requirement is met;
manufacturing an energy pile: manufacturing a reinforcement cage according to design requirements, wherein the spiral stirrup adopts a plain steel bar, and the reinforcing stirrup is provided with a transverse steel bar; binding the heat exchange pipeline on the main ribs in a double-U-shaped distribution mode at any four adjacent main ribs on the reinforcement cage through plastic binding belts, wherein the space between the plastic binding belts is not more than 0.5m, and cutting off redundant binding belts after binding is finished; the top end and the bottom end of the heat exchange pipeline are butted through an elbow and in a screw thread connection mode, and two interfaces of the elbow are 180 degrees, and the connection length is not less than 6 cm; the elbow at the top end is arranged close to the top end of the energy pile; a V-shaped baffle welded with the main rib is arranged on the elbow at the bottom end, the height and the width of the V-shaped baffle are respectively larger than those of the elbow, and the V-shaped baffle is positioned in front of the elbow along the downward inserting direction of the reinforcement cage; uniformly brushing an antifriction agent with the thickness of more than 1mm on the outer surface of the heat exchange pipeline; installing a steel sleeve at an inlet and outlet section of the heat exchange pipeline, and filling foam rubber between the steel sleeve and the heat exchange pipeline; after the heat exchange pipeline is installed, namely before the steel reinforcement cage is inserted downwards, a pressure gauge and a valve are respectively installed at two joints of the heat exchange pipeline, an air pressurizing device is connected to the valve, when pressurization is carried out, the valve is closed when the pressure gauge displays that the pressure is 0.8MPa, and the air pressurizing device is removed;
forming a pile hole: in the drilling process of the drilling machine, the drilling speed is timely adjusted according to stratum changes, the designed depth is reached at one time, and the pile length and the pile diameter are ensured;
lifting the drill and pouring concrete: commercial concrete with slump of 160-220mm is adopted, coarse aggregate is broken stone with the thickness of 5-15mm, the cement is ordinary portland cement, fine aggregate is medium-coarse sand, and retarder is added into the concrete to prolong the setting time of the concrete; pumping concrete from the middle of the drill rod, pumping the concrete while lifting the drill rod, and stopping pumping the concrete when the drill rod is lifted to the elevation of the pile top;
energy pile is transferred: firstly, horizontally placing a reinforcement cage of an energy pile on the ground, inserting a steel pipe of a low-frequency vibration device into an inner cavity of the reinforcement cage along the horizontal direction, and then flexibly connecting the reinforcement cage with the low-frequency vibration device through a steel wire rope; after concrete is pumped by a drilling center pump to form a pile body, hoisting a low-frequency vibration device and a reinforcement cage, inserting the lower end of the reinforcement cage into the concrete pile body, vibrating and impacting the end part of the reinforcement cage by virtue of gravity and the low-frequency vibration device to enable the reinforcement cage to sink to a preset depth, inserting the reinforcement cage under the action of self weight of the reinforcement cage to reduce vibration time, starting the low-frequency vibration device to vibrate when the speed of the reinforcement cage becomes slow or stops, and ensuring that the inserting speed is not more than 0.8 m/min; lifting the low-frequency vibration device, statically pulling for 2.0min and then vibrating to prevent the reinforcement cage from being taken out or sinking;
the long spiral drilling pressure filling energy pile is formed: after the reinforcement cage is inserted to a specified position, if the numerical value of the pressure gauge is not less than 0.6MPa, the heat exchange pipeline is intact, namely the energy pile is successfully completed; after the pile is formed, the pile head needs to be protected, the heat exchange pipeline needs to be noticed, and the collision between the vehicle rolling pile head and the bucket is strictly forbidden; when pile heads and construction bearing platforms or crown beams are removed at the later stage, attention needs to be paid to protecting the heat exchange pipelines.
The construction method of the long spiral drilling pressure-filling energy pile structure has the same advantages as the long spiral drilling pressure-filling energy pile structure compared with the prior art, and the detailed description is omitted.
Drawings
Fig. 1 is a schematic elevation view of a long auger drilling pressure-filling energy pile structure according to an embodiment of the present invention;
FIG. 2 is a schematic assembly diagram of a long auger drilling pressure-filling energy pile structure according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a heat exchange pipeline in a long auger drilling pressure-filling energy pile structure provided in an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a low-frequency vibration device in a long auger drilling pressure-filling energy pile structure provided by the embodiment of the utility model;
fig. 5 is a schematic cross-sectional view of a long auger drilling pressure-filling energy pile structure provided in an embodiment of the present invention;
fig. 6 is a schematic partial structural view of a V-shaped baffle in a long auger drilling pressure-filling energy pile structure according to an embodiment of the present invention;
fig. 7 is a schematic cross-sectional view of a steel sleeve in a long auger drilling pressure-filling energy pile structure according to an embodiment of the present invention;
fig. 8 is a schematic cross-sectional view of a reinforcement stirrup in a long auger drilling pressure-filling energy pile structure according to an embodiment of the present invention;
fig. 9 is a schematic construction flow diagram of a long auger drilling pressure-filling energy pile structure according to an embodiment of the present invention.
Reference numerals:
a, pile holes; b-concrete; c-a low frequency vibration device; d-bearing platform or crown beam;
1-a reinforcement cage; 11-main reinforcement; 12-reinforcement stirrup; 121-transverse steel bars; 13-spiral stirrup; 14-a steel bar protection bracket;
2-heat exchange lines; 21-bending head;
3-V type baffle; 31-reinforcing steel bars;
4-a steel sleeve; 41-foam rubber;
51-pressure gauge; 52-valve.
Detailed Description
For the convenience of understanding, the long auger drilling pressure-filling energy pile structure and the construction method thereof provided by the embodiment of the utility model are described in detail below with reference to the attached drawings of the specification.
The embodiment of the utility model provides a long spiral drilling pressure irrigation energy pile structure, as shown in fig. 1-8, comprising: the reinforcement cage 1 is positioned in the pile hole A, the reinforcement cage 1 comprises a plurality of main reinforcements 11 which are vertically distributed, a plurality of circumferential reinforcement stirrups 12 and spiral stirrups 13 which are wound around the main reinforcements 11 and spirally distributed are distributed on the inner sides of the main reinforcements 11, and the reinforcement stirrups 12 and the spiral stirrups 13 which are spirally distributed are bound and fixed with the main reinforcements 11;
a heat exchange pipeline 2 is vertically arranged along the reinforcement cage 1, and the heat exchange pipeline 2 is bound and connected with the main reinforcement 11 in a double-U-shaped distribution mode; the top end and the bottom end of the heat exchange pipeline 2 are connected through an elbow 21, a V-shaped baffle 3 connected with the main rib 11 is arranged below the elbow 21 at the bottom end of the heat exchange pipeline 2, and the height and the width of the V-shaped baffle 3 are respectively greater than the height and the width of the elbow 21; the reinforcement stirrup 12 is provided with a transverse steel bar 121, and the transverse steel bar 121 is used for separating the heat exchange pipeline 2 from the low-frequency vibration device C; a steel sleeve 4 is arranged in the area, close to the top end of the steel reinforcement cage 1, of the heat exchange pipeline 2 and extending out of the steel reinforcement cage 1, and foam rubber 41 is filled between the steel sleeve 4 and the heat exchange pipeline 2; the two joints of the heat exchange pipeline 2 are respectively connected with a pressure gauge 51 and a valve 52, and the valve 52 is used for connecting an air pressurizing device.
Compared with the prior art, the long spiral drilling pressure filling energy pile structure provided by the embodiment of the utility model has the following advantages:
according to the long spiral drilling pressure-filling energy pile structure provided by the embodiment of the utility model, firstly, the insertion quality of the energy pile and the reinforcement cage 1 thereof is ensured, and the damage of a heat exchange loop in the construction process is greatly reduced; secondly, compared with the most commonly used slurry wall-protecting and pore-forming cast-in-place pile at present, the method has the following remarkable advantages: the method is environment-friendly, the long spiral drilling pressure-grouting process does not have slurry, and the slurry wall-protecting hole-forming cast-in-place pile process can generate a large amount of slurry; secondly, high efficiency, integration of long spiral hole forming, pouring and pile forming (hole forming → poured concrete → lower reinforcement cage → pile forming), and higher pile forming efficiency compared with the slurry wall protection hole forming and pile pouring process (hole forming → lower reinforcement cage → lower guide pipe → poured concrete → pipe drawing → pile forming); thirdly, the manufacturing cost is lower than that of a slurry retaining wall hole-forming cast-in-place pile process; thirdly, the heat exchange pipeline 2 is bound on the main rib 11 in a double-U-shaped distribution mode instead of spirally binding the heat exchange pipeline 2, so that the heat exchange pipeline 2, the main rib 11 and the reinforcement cage 1 are ensured to be inserted into the pile body in a straight direction, the friction resistance of the concrete B to the heat exchange pipeline 2 is greatly reduced, and the integrity of the heat exchange pipeline 2 is effectively improved; moreover, the V-shaped baffle 3 is arranged at the bottom end part of the heat exchange pipeline 2, so that the resistance of the concrete B to the heat exchange pipeline 2 can be reduced to a greater extent in the process of inserting the reinforcement cage 1; finally, pressurizing the heat exchange pipeline 2, closing the valve 52 when the pressure gauge indicates that the pressure is 0.8MPa, constructing the heat exchange pipeline 2 under pressure, and constantly mastering whether the heat exchange pipe is damaged or not in the process of lowering the reinforcement cage 1; in addition, a transverse steel bar 121 is arranged on the reinforcement stirrup 12 to separate the heat exchange pipeline 2 from the low-frequency vibration device C, so that the heat exchange pipeline 2 is effectively prevented from being damaged due to extrusion caused by the deviation of the low-frequency vibration device C during operation; and, the steel sleeve 4 is arranged at the inlet and outlet section of the heat exchange pipeline 2, so that the heat exchange pipeline 2 can be effectively protected when pile heads and bearing platforms or crown beams D are removed in the later period, and meanwhile, foam rubber 41 is filled between the steel sleeve 4 and the heat exchange pipeline 2, and the port of the steel sleeve 2 can be effectively prevented from scratching the heat exchange pipeline 2.
In practical application, as shown in fig. 1 to 3, the heat exchange pipeline 2 may be bound and connected with four adjacent main ribs 11 through plastic bands in a double U-shaped distribution manner, and the connection manner belongs to flexible connection, so that the phenomenon that the heat exchange pipeline 2 is deformed due to the deformation of the main ribs 11 is effectively avoided, and the service life of the heat exchange pipeline 2 is further prolonged; and the distance between the plastic bands can be preferably not more than 0.5m, and redundant bands are cut off after the binding is finished, so that the resistance of the heat exchange pipeline 2 in the inserting process is effectively reduced.
The heat exchange pipeline 2 can be preferably made of steel, so that the damage to the heat exchange pipeline 2 can be avoided in the process of lowering the reinforcement cage 1; and, the inside and outside surface of this steel pipe can all have the anticorrosive coating to further effectively improve heat transfer pipeline 2's life.
Specifically, an anti-friction agent layer can be uniformly coated on the anticorrosive layer on the outer surface of the heat exchange pipeline 2, and the thickness of the anti-friction agent layer is preferably more than 1 mm; the friction reducer is commercially available, is produced from natural oil through a special process, is non-toxic and environment-friendly, is easy to coat uniformly, is insoluble in water, has good curing stability, is not easy to peel off, and can greatly reduce the lateral friction force between the heat exchange pipeline 2 and the concrete B.
Further, as shown in fig. 1-3 and fig. 6, two interfaces of the elbow 21 are distributed at 180 degrees, and the elbow 21 and the heat exchange pipeline 2 can be butted in a threaded connection manner, and meanwhile, the connection length is not less than 6cm, so that the connection reliability is effectively improved; in addition, the heat exchange pipeline 2 is bound on the adjacent main rib 11, so that the width of the elbow 21 is minimized as much as possible, and the resistance of the heat exchange pipeline 2 in the process of inserting downwards is further effectively reduced.
Furthermore, as shown in fig. 6, the V-shaped baffle 3 may preferably be made of steel, a reinforcing steel bar 31 may be disposed inside the V-shaped baffle 3, and both the reinforcing steel bar 31 and the V-shaped baffle 3 may be connected to the main bar 11 by welding, so as to effectively improve the firmness of the V-shaped baffle 3.
The V-shaped baffle 3 is arranged in front of the elbow 21 along the axial downward insertion direction of the reinforcement cage 1, so that the V-shaped baffle 3 can greatly reduce the resistance of the concrete B to the heat exchange pipeline 2 in the downward insertion process of the reinforcement cage 1; and the height and the width of the V-shaped baffle 3 are respectively larger than those of the elbow 21, so that the V-shaped baffle 3 can completely block the end resistance of the concrete B to the elbow 21 and the heat exchange pipeline 2.
Still further, the spiral stirrup 13 may preferably be a round steel bar, so that the downward insertion resistance of the reinforcement cage 1 can be effectively reduced compared with a ribbed steel bar.
The elbow 21 at the top end of the heat exchange pipeline 2 should be arranged close to the top end of the energy pile as much as possible, so that the downward insertion distance of the elbow 21 at the top end in the concrete B is short, the resistance of the concrete B to the elbow 21 at the top end is greatly reduced, and the connection reliability of the heat exchange pipeline 2 and the elbow 21 is ensured.
Every interval 2m position department of the axial of the main muscle 11 along steel reinforcement cage 1 can be provided with one respectively and strengthen stirrup 12, and be equipped with a horizontal reinforcing bar 121 on this reinforcement stirrup 12 to be used for separating heat transfer pipeline 2 and low frequency vibrating device C, thereby effectively avoid low frequency vibrating device C to take place the skew and extrude damage heat transfer pipeline 2 at the during operation.
In practical application, as shown in fig. 1 and 2, a plurality of reinforcement protection brackets 14 may be disposed at equal intervals along the vertical direction of the reinforcement cage 1, so that the stability of the energy pile is further improved by the reinforcement protection brackets 14.
When the energy pile is used as a foundation pile, the steel sleeve 4 can be used for protecting the heat exchange pipeline 2 in the later construction of the bearing platform D; and/or, when the energy pile is used as a support pile, the steel sleeve 4 can be used for protecting the heat exchange pipeline 2 in later-stage crown beam construction. In the prior art, after a foundation pit is backfilled, a supporting pile is usually ineffective and becomes a waste pile, and if the energy pile is used for the supporting pile, waste can be changed into valuable, and the supporting pile can be continuously enabled to play a role.
It should be added here that the retarder can be added to the concrete B to prolong the setting time of the concrete B, so that more time is available for inserting the reinforcement cage 1, the reinforcement cage 1 should be inserted slowly, and the inserting speed can be preferably not greater than 0.8m/min, thereby effectively relieving the pulling and extrusion of the heat exchange pipeline 2 by the concrete B, and further improving the integrity of the heat exchange pipeline 2.
After the heat exchange pipeline 2 is installed, namely before the reinforcement cage 1 is inserted downwards, a pressure gauge 51 and a valve 52 are respectively connected to two interfaces of the heat exchange pipeline 2, and an air pressurizing device can be connected to the valve 52; the energy pile is pressurized through the air pressurizing device, when the pressure gauge 51 displays that the pressure is 0.8MPa, the valve 52 is closed, the air pressurizing device is removed, then the steel reinforcement cage 1 is inserted downwards, after the steel reinforcement cage 1 is inserted downwards to a specified position, if the numerical value of the pressure gauge 51 is not less than 0.6MPa, the heat exchange pipeline 2 is indicated to be intact, and the energy pile is completed successfully.
The embodiment of the utility model further provides a construction method of the long spiral drilling pressure filling energy pile structure, as shown in fig. 1-8 and fig. 9, the construction method comprises the following steps:
step S1, positioning a drilling machine: the field is ensured to be flat and stable, the vertical deviation of the drill rod is checked by a specially-assigned person through a line cone or a theodolite, the verticality of the drill rod is controlled by two-way 90 degrees, and meanwhile, the pile position deviation condition is checked, so that the inclination movement is avoided in the construction, and the drill can be drilled after the requirement is met;
step S2, manufacturing an energy pile: step S21, manufacturing the reinforcement cage 1 according to design requirements, wherein the spiral stirrup 13 adopts a smooth round steel bar, and the reinforcing stirrup 12 is provided with a transverse steel bar 121; step S22, binding the heat exchange pipeline 2 on the main ribs 11 in a double-U-shaped distribution mode at any four adjacent main ribs 11 on the reinforcement cage 1 through plastic binding tapes, wherein the distance between the plastic binding tapes is not more than 0.5m, and cutting off redundant binding tapes after the binding is finished; step S23, the top end and the bottom end of the heat exchange pipeline 2 are butted through the elbow 21 in a screw thread connection mode, and the two interfaces of the elbow 21 are 180 degrees and the connection length is not less than 6 cm; step S24, arranging the top elbow 21 close to the top end of the energy pile; step S25, arranging a V-shaped baffle 3 welded with the main rib 11 for the elbow 21 at the bottom end, wherein the height and the width of the V-shaped baffle 3 are respectively larger than those of the elbow 21, and the V-shaped baffle 3 is positioned in front of the elbow 21 along the downward inserting direction of the reinforcement cage 1; step S26, uniformly coating an antifriction agent with the thickness of more than 1mm on the outer surface of the heat exchange pipeline 2; step S27, installing a steel sleeve 4 at the inlet and outlet sections of the heat exchange pipeline 2, and filling foam rubber 41 between the steel sleeve 4 and the heat exchange pipeline 2; step S28, after the heat exchange pipeline 2 is installed, namely before the reinforcement cage 1 is inserted downwards, a pressure gauge 51 and a valve 52 are respectively installed at two interfaces of the heat exchange pipeline 2, an air pressurizing device is connected to the valve 52, when pressurization is carried out, when the pressure gauge 51 displays that the pressure is 0.8MPa, the valve 52 is closed, and the air pressurizing device is removed;
step S3, forming pile holes: in the drilling process of the drilling machine, the drilling speed is timely adjusted according to stratum changes, the designed depth is reached at one time, and the pile length and the pile diameter are ensured;
step S4, lifting the drill and pouring concrete: step S41, adopting commercial concrete, wherein the slump is 220mm, the coarse aggregate is crushed stone of 5-15mm, the cement is ordinary portland cement, the fine aggregate is medium-coarse sand, and the concrete is added with a retarder to prolong the setting time of the concrete; s42, pumping concrete from the middle of the drill rod, pumping the concrete while lifting the drill, and stopping pumping the concrete when the drill rod is lifted to the elevation of the pile top;
step S5, lowering energy piles: step S51, horizontally placing the reinforcement cage 1 of the energy pile on the ground, inserting a steel pipe of the low-frequency vibration device C into the inner cavity of the reinforcement cage 1 along the horizontal direction, and then flexibly connecting the reinforcement cage 1 with the low-frequency vibration device C through a steel wire rope; step S52, after concrete is pumped by a central pump to form a pile body, hoisting a low-frequency vibration device C and a reinforcement cage 1, inserting the lower end of the reinforcement cage 1 into the concrete pile body, vibrating and impacting the end part of the reinforcement cage 1 by means of gravity and the low-frequency vibration device C to enable the reinforcement cage 1 to sink to a preset depth, inserting the reinforcement cage 1 under the action of self weight of the reinforcement cage to reduce vibration time, opening the low-frequency vibration device C to vibrate when the speed of the reinforcement cage 1 becomes slow or stops, and ensuring that the inserting speed is not more than 0.8 m/min; step S53, lifting the low-frequency vibration device C, statically pulling for 2.0min and then vibrating to prevent the reinforcement cage 1 from being brought out or sinking;
step S6, forming the long spiral drilling pressure filling energy pile: after the reinforcement cage 1 is inserted to a specified position, if the value of a pressure gauge 51 is not less than 0.6MPa, the heat exchange pipeline 2 is intact, namely the energy pile is successfully completed; moreover, after the pile is formed, the pile head needs to be protected, the heat exchange pipeline needs to be noticed, and the collision of a vehicle for rolling the pile head and the bucket is strictly forbidden; in addition, attention needs to be paid to protecting the heat exchange pipeline when pile heads and construction bearing platforms or crown beams are removed at the later stage.
In summary, the long auger drilling pressure-filling energy pile structure and the construction method thereof provided by the embodiment of the utility model are beneficial to popularization and application of the energy pile. According to the long spiral drilling pressure irrigation energy pile, heat-carrying fluid enters the heat exchange pipeline 2, circulates in the energy pile along the heat exchange pipeline 2 under the action of pump pressure, exchanges heat with surrounding rock and soil mass, and then flows out of the energy pile through the heat exchange pipeline 2; besides, the surrounding rock-soil bodies are heat sources in winter and cold sources in summer.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (9)
1. The utility model provides a long auger drilling pressure irrigation energy pile structure which characterized in that includes: the reinforcement cage is positioned in the pile hole and comprises a plurality of main reinforcements which are vertically distributed, a plurality of circumferential reinforcement stirrups and spiral stirrups which are wound on the main reinforcements and spirally distributed are distributed on the inner sides of the main reinforcements, and the reinforcement stirrups and the spirally distributed spiral stirrups are bound and mutually fixed with the main reinforcements;
a heat exchange pipeline is arranged along the vertical direction of the reinforcement cage and is bound and connected with the main reinforcement in a double-U-shaped distribution mode; the top end and the bottom end of the heat exchange pipeline are connected through an elbow, a V-shaped baffle connected with the main rib is arranged below the elbow at the bottom end of the heat exchange pipeline, and the height and the width of the V-shaped baffle are respectively greater than those of the elbow; the reinforcement stirrup is provided with a transverse steel bar, and the transverse steel bar is used for separating the heat exchange pipeline and the low-frequency vibration device; a steel sleeve is arranged in the area, close to the top end of the steel reinforcement cage and extending out of the steel reinforcement cage, of the heat exchange pipeline, and foam rubber is filled between the steel sleeve and the heat exchange pipeline; two interfaces of the heat exchange pipeline are respectively connected with a pressure gauge and a valve, and the valve is used for connecting an air pressurizing device.
2. The long auger drilling pressure-filling energy pile structure according to claim 1, wherein the heat exchange pipeline is in a double-U-shaped distribution and is in binding connection with four adjacent main bars through plastic ties.
3. The long auger drilling and pressure irrigation energy pile structure of claim 1, wherein the heat exchange pipeline is a steel pipe, and the inner and outer surfaces of the steel pipe are provided with anti-corrosion layers.
4. The long auger drilling and pressure irrigation energy pile structure according to claim 3, characterized in that an anti-friction agent layer is uniformly painted on the anti-corrosion layer on the outer surface of the heat exchange pipeline, and the thickness of the anti-friction agent layer is more than 1 mm.
5. The long auger drilling and pressure irrigation energy pile structure according to claim 1, wherein two joints of the elbow are distributed at 180 degrees, and the elbow is butted with the heat exchange pipeline in a threaded connection manner.
6. The long auger drilling and pressure irrigation energy pile structure according to claim 1, wherein the V-shaped baffle is made of steel, reinforcing steel bars are arranged inside the V-shaped baffle, and the reinforcing steel bars and the V-shaped baffle are connected with the main bars in a welding manner.
7. The long auger drilling and pressure irrigation energy pile structure of claim 1, wherein the helical stirrups are smooth round steel bars.
8. The long auger drilling and pressure irrigation energy pile structure as claimed in any one of claims 1 to 7, wherein a plurality of reinforcement protection brackets are provided at equal intervals in a vertical direction of the reinforcement cage.
9. The long auger drilling and pressure irrigation energy pile structure of claim 8, wherein the energy pile is used as a foundation pile, and the steel sleeve is used for protecting the heat exchange pipeline during the later stage of the bearing platform construction;
and/or the energy pile is used as a support pile, and the steel sleeve is used for protecting the heat exchange pipeline in later-stage crown beam construction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120945641.XU CN216275628U (en) | 2021-05-06 | 2021-05-06 | Long auger drilling pressure irrigation energy pile structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120945641.XU CN216275628U (en) | 2021-05-06 | 2021-05-06 | Long auger drilling pressure irrigation energy pile structure |
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| Publication Number | Publication Date |
|---|---|
| CN216275628U true CN216275628U (en) | 2022-04-12 |
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| CN202120945641.XU Active CN216275628U (en) | 2021-05-06 | 2021-05-06 | Long auger drilling pressure irrigation energy pile structure |
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| CN (1) | CN216275628U (en) |
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2021
- 2021-05-06 CN CN202120945641.XU patent/CN216275628U/en active Active
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