CN108166486B - Deep buried pipe type prefabricated energy pipe pile and construction process thereof - Google Patents
Deep buried pipe type prefabricated energy pipe pile and construction process thereof Download PDFInfo
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- CN108166486B CN108166486B CN201810119817.9A CN201810119817A CN108166486B CN 108166486 B CN108166486 B CN 108166486B CN 201810119817 A CN201810119817 A CN 201810119817A CN 108166486 B CN108166486 B CN 108166486B
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000010276 construction Methods 0.000 title claims abstract description 24
- 238000005553 drilling Methods 0.000 claims abstract description 70
- 239000011150 reinforced concrete Substances 0.000 claims description 55
- 230000002787 reinforcement Effects 0.000 claims description 23
- 229910000831 Steel Inorganic materials 0.000 claims description 16
- 239000010959 steel Substances 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 238000007789 sealing Methods 0.000 claims description 8
- 238000003466 welding Methods 0.000 claims description 8
- 239000004576 sand Substances 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 4
- 238000004873 anchoring Methods 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 239000004567 concrete Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 229910000278 bentonite Inorganic materials 0.000 description 2
- 239000000440 bentonite Substances 0.000 description 2
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/52—Piles composed of separable parts, e.g. telescopic tubes ; Piles composed of segments
- E02D5/523—Piles composed of separable parts, e.g. telescopic tubes ; Piles composed of segments composed of segments
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/24—Prefabricated piles
- E02D5/30—Prefabricated piles made of concrete or reinforced concrete or made of steel and concrete
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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 invention belongs to the technical field of building pile foundation and energy development, and relates to a deep buried pipe type prefabricated energy pipe pile capable of improving shallow geothermal clean energy utilization rate and a construction process thereof, wherein the deep buried pipe type prefabricated energy pipe pile comprises a prefabricated energy pipe pile, a deep drilling heat exchange well, a heat exchange pipe and backfill; the prefabricated energy pipe pile and the deep drilling heat exchange well are coaxially arranged from top to bottom; inside prefabricated formula energy tubular pile and deep drilling heat transfer well vertical drilling holes are formed along the axial direction of the prefabricated energy pipe pile; the whole heat exchange tube is U-shaped; heat exchange tube from prefabricated energy pipe pile the top extends to the bottom of the deep drilling heat exchange well; backfill is filled in the heat exchange tube and the vertical drill hole. The invention has reasonable structure and simple construction process, can save drilling cost and does not influence the construction of the precast pile, and is a novel energy precast pile form with high efficiency and environmental protection.
Description
Technical Field
The invention belongs to the technical field of building pile foundation and energy development, and relates to an energy pipe pile and a construction process, in particular to a deep buried pipe type prefabricated energy pipe pile capable of improving the utilization rate of shallow geothermal clean energy and a construction process thereof.
Background
The ground source heat pump system has become a main form of clean energy by virtue of the advantages of saving energy, reducing pollutant emission and the like, and the ground source heat pump application is the core of underground space energy application engineering and has special advantages compared with other air conditioning systems. By 2020, the geothermal heating or refrigerating area of China can reach 16 hundred million square meters in total, and 7210 ten thousand tons of standard coal can be replaced, so that the geothermal heat pump industry serving as an energy-saving and environment-friendly industry is brought into the spotlight. The traditional buried pipe type ground source heat pump technology is difficult to popularize and apply in areas with shortage of land supply such as urban areas due to large occupied area and difficult utilization of upper space. The energy pile technology realizes the dual functions of bearing the load on the upper part of a building and exchanging shallow geothermal energy by embedding heat exchange tubes in the pile foundation of the building. The energy pile has the advantages of not occupying extra area, saving part of drilling cost and the like. Usually pile foundation pile length is 20-30 m, and ground source heat pump drilling depth reaches 100m, so it is difficult to obtain sufficient heat exchange quantity in limited pile length, and therefore, traditional pile-in-pile buried pipe type energy pile heat exchange quantity is less. And the existing energy pile mainly uses the cast-in-place pile, relies on the manual work to tie the heat exchange tube on the steel reinforcement cage for fixing, has very large influence on mechanized pile foundation construction, and is difficult to continuously operate.
Disclosure of Invention
In order to solve the technical problems in the background art, the invention provides a deep buried pipe type prefabricated energy pipe pile which is efficient and environment-friendly, can save drilling cost and has partial influence on the construction of prefabricated piles and a construction process thereof.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the utility model provides a deep buried pipe formula prefabricated energy tubular pile which characterized in that: the deep buried pipe type prefabricated energy pipe pile comprises a prefabricated energy pipe pile, a deep drilling heat exchange well, a heat exchange pipe and backfill; the prefabricated energy pipe pile and the deep drilling heat exchange well are coaxially arranged from top to bottom; vertical drilling holes are formed in the prefabricated energy pipe pile and the deep drilling heat exchange well along the axial direction of the prefabricated energy pipe pile; the whole heat exchange tube is U-shaped; the heat exchange tube extends from the top of the prefabricated energy pipe pile to the bottom of the deep drilling heat exchange well; the backfill is filled between the heat exchange tube and the vertical borehole.
As a preferred alternative to this, the prefabricated energy pipe pile adopted by the invention comprises one or more sections of prefabricated reinforced concrete pipe piles; the prefabricated reinforced concrete pipe pile and the deep drilling heat exchange well are coaxially arranged from top to bottom; when the precast reinforced concrete pipe piles are multi-section, the multi-section precast reinforced concrete pipe piles are sequentially connected from top to bottom.
Preferably, the prefabricated energy pipe pile used in the invention further comprises a pile top heat exchange tube protection device which is arranged at the top of the prefabricated reinforced concrete pipe pile and is used for protecting the prefabricated reinforced concrete pipe pile and the heat exchange tube.
Preferably, the pile top heat exchange tube protection device comprises a prefabricated disc steel member and an anchor bolt; the prefabricated disc steel member is provided with an anchor bolt through hole and a heat exchange tube through hole; the heat exchange pipe penetrates through the heat exchange pipe through hole and then extends from the top of the prefabricated energy pipe pile to the bottom of the deep drilling heat exchange well; the anchor bolts are used for connecting the prefabricated disc steel members with the top prefabricated reinforced concrete pipe piles through anchor bolt through holes.
Preferably, the heat exchange tube adopted by the invention comprises a water inlet tube and a water outlet tube connected with the water inlet tube; the water inlet pipe and the water outlet pipe are connected and then are integrally U-shaped.
Preferably, the heat exchange tube used in the invention is of a single U type, a double U series type or a double U parallel type.
Preferably, the backfill used in the present invention is fine sand or bentonite.
Preferably, the deep buried pipe type prefabricated energy pipe pile adopted by the invention further comprises a connection bearing platform reinforcement cage which is arranged at the top of the prefabricated energy pipe pile and is arranged in the vertical drilling hole.
The construction process based on the deep buried pipe type prefabricated energy pipe pile is characterized by comprising the following steps of: the construction process comprises the following steps:
1) Pile sinking equipment is adopted, and the prefabricated reinforced concrete pipe piles are driven at specified positions according to the design scheme;
2) Calculating pile driving depth according to the design requirement, and stopping pile driving when the pile driving reaches the design elevation;
3) Embedding and fixing the pile top heat exchange tube protecting device into the pile head of the precast reinforced concrete pipe pile;
4) Setting up a drilling machine, placing a pile casing and a drill rod from the inside of a fixing device of the precast reinforced concrete pipe pile head, and vertically drilling downwards; when the depth of the vertical drilling hole is not less than 100 meters, the drill rod and the casing are pulled out;
5) Lowering the heat exchange tube in the vertical drilling hole until the bottom end of the heat exchange tube reaches the bottom of the vertical drilling hole, cutting off the exposed excessive part of the upper part of the heat exchange tube and performing sealing protection;
6) Backfilling gaps between the heat exchange tubes and the vertical drilling holes by adopting backfilling, and reserving a sinking groove which is not more than 1m at the upper part of the precast reinforced concrete pipe pile;
7) A connecting bearing platform reinforcement cage is lowered in the sinking groove, the bottom end of the connecting bearing platform reinforcement cage is inserted into backfill, and the upper part of the connecting bearing platform reinforcement cage is fixed on the pile top of the precast reinforced concrete pipe pile through transverse reinforcements;
8) And welding the horizontal heat exchange tube with the heat exchange tube in the vertical drilling hole by using an elbow, sealing and protecting the port of the horizontal heat exchange tube, and paving a sand cushion layer of 5-10 cm at the bottom of the horizontal heat exchange tube for protection.
Preferably, when the precast reinforced concrete pipe pile in the step 1) adopted by the invention is multi-section, pile bottoms and pile tops of two adjacent sections of precast reinforced concrete pipe piles are subjected to head-to-tail pile splicing by a flange plate connecting method, a welding method and/or a slurry anchoring method;
in the step 2), when the pile is delivered to the designed elevation and then the pile delivery is stopped, if the leakage length of the precast reinforced concrete pipe pile exceeds the designed value, cutting part of the pipe pile exceeding the elevation by cutting equipment,
the step 8) further comprises the following steps:
9) Pouring a foundation bearing platform or a foundation beam on the top of the precast reinforced concrete pipe pile according to the design requirement of the top structure of the precast reinforced concrete pipe pile;
10 A horizontal heat exchange tube is connected with a water collecting and dividing device of the heat exchange system.
The invention has the advantages that:
the invention provides a deep buried pipe type prefabricated energy pipe pile and a construction process thereof, which can solve the problems of insufficient heat exchange capacity of a buried pipe type energy pile and occupied land area of a traditional ground source heat pump in the prior art, and improve the overall heat exchange capacity and the heat exchange efficiency. The invention adopts the structure form of deep drilling buried pipes in the open type precast pipe pile, and additional temperature loads generated by heat exchange are symmetrically distributed in the heat exchange process, so that the invention is in a good stress state. The pile top heat exchange tube protection device adopted by the invention not only can protect the precast tubular pile after pile cutting, but also can play a role in protecting the heat exchange tube in the pile and the horizontal inlet heat exchange tube. The drilling depth of the lower part of the prefabricated pipe pile is variable, and different heat exchange amounts can be obtained by selecting different drilling depths according to the requirements of users. Unlike the pouring energy pile with heat exchange pipe tied during lowering reinforcing cage, the prefabricated energy pile is used as bearing structure to save labor and ensure pile quality. The invention discloses a construction process of a deep buried pipe type prefabricated energy pipe pile, which has less influence on the original pile foundation construction scheme in the construction aspect, and saves the drilling cost in the prefabricated pipe pile. Therefore, the invention has the advantages of the traditional prefabricated energy pile and the ground source heat pump, is a novel energy pile with environmental protection and good bearing property, and has wide application prospect. According to the invention, the bottom of the prefabricated pipe pile is continuously drilled downwards, so that the depth of the buried pipe reaches 100m, and the heat exchange efficiency and heat exchange quantity of the prefabricated pipe pile can be effectively improved. The precast pile has the advantages of quick construction, fixed structural form and the like, and the heat exchange tube is deeply buried in the precast pile without influencing pile foundation construction, so that the precast pile has reasonable structural form and wide application prospect.
Drawings
Fig. 1a is an overall schematic diagram of a deep buried pipe type prefabricated energy pipe pile provided by the invention;
fig. 1b is a schematic cross-sectional structure of a deep buried pipe type prefabricated energy pipe pile according to the present invention;
fig. 2 is a schematic structural diagram of a reinforcement cage with a connection bearing platform adopted by the invention;
FIG. 3 is a schematic diagram of a front view of a pile top heat exchange tube protection device according to the present invention;
FIG. 4 is a schematic top view of a pile top heat exchange tube protection device according to the present invention;
the reference numerals are explained as follows:
1-connecting a bearing platform reinforcement cage; 2-anchor bolts; 3-pile top heat exchange tube protecting device; 4-prefabricating an energy pipe pile; 5-prefabricating the reinforced concrete pipe pile; 6-a heat exchange tube; 7-deep drilling a heat exchange well; 8-backfilling.
Detailed Description
The novel energy pile provided by the invention is environment-friendly and has good bearing characteristics, the reasonable combination of the prefabricated energy pile and the deep drilling heat exchange well is effectively utilized, the heat exchange quantity and the heat exchange efficiency of the energy pile are greatly improved, the novel energy pile has good stress performance, and the novel energy pile has good market prospect and popularization value.
Referring to fig. 1a and 1b, the present invention provides a deep buried pipe type prefabricated energy pipe pile, which comprises a prefabricated energy pipe pile 4, a deep drilled heat exchange well 7, a heat exchange pipe 6 and a backfill 8; the prefabricated energy pipe pile 4 and the deep drilling heat exchange well 7 are coaxially arranged from top to bottom; vertical drilling holes are formed in the prefabricated energy pipe pile 4 and the deep drilling heat exchange well 7 along the axial direction of the prefabricated energy pipe pile 4; the heat exchange tube 6 is U-shaped as a whole; the heat exchange tube 6 extends from the top of the prefabricated energy pipe pile 4 to the bottom of the deep drilling heat exchange well 7; backfill 8 fills between the heat exchange tube 6 and the vertical bore. The prefabricated energy pipe piles 4 are arranged on the deep drilling heat exchange well 7 in parallel; the distance between adjacent prefabricated energy pipe piles 4 is not less than 4 meters, so that interference to adjacent vertical drilling holes during vertical drilling is prevented.
The prefabricated energy pipe pile 4 comprises one or more sections of prefabricated reinforced concrete pipe piles 5; the prefabricated reinforced concrete pipe pile 5 and the deep drilling heat exchange well 7 are coaxially arranged from top to bottom; when the precast reinforced concrete pipe pile 5 is multisection, multisection precast reinforced concrete pipe pile 5 links to each other in proper order from top to bottom, and the pile head of precast reinforced concrete pipe pile 5 is open.
The prefabricated energy pipe pile 4 further comprises a pile top heat exchange tube protection device 3 which is arranged at the top of the top prefabricated reinforced concrete pipe pile 5 and used for protecting the prefabricated reinforced concrete pipe pile 5 and the heat exchange tube 6. Referring to fig. 3 and 4, the pile top heat exchange tube protecting device 3 adopted by the invention comprises a prefabricated disc steel member and an anchor bolt 2; an anchor bolt through hole and a heat exchange tube through hole are formed in the prefabricated disc steel member; the prefabricated disc steel member is embedded into the prefabricated energy pipe pile 4 through the overhanging end of the bottom to fix and protect the pile head; the heat exchange tube 6 passes through the heat exchange tube through hole and then extends from the top of the prefabricated energy tube pile 4 to the bottom of the deep drilling heat exchange well 7; the anchor bolts 2 connect the prefabricated disc steel members with the topmost prefabricated reinforced concrete pipe piles 5 through anchor bolt through holes.
The heat exchange tube 6 comprises a water inlet tube and a water outlet tube connected with the water inlet tube; the water inlet pipe and the water outlet pipe are connected to form a U-shaped integral, and the heat exchange pipe 6 is of a single U type, a double U serial type or a double U parallel type.
The backfill 8 is fine sand or bentonite.
Referring to fig. 2, the deep buried pipe type prefabricated energy pipe pile provided by the invention further comprises a connection bearing platform reinforcement cage 1 which is arranged at the top of the prefabricated energy pipe pile 4 and is arranged in a vertical drilling hole. The steel reinforcement cage 1 of the connection bearing platform does not contain a bottom supporting plate, and backfill filler 8 is adopted in the prefabricated pipe pile to compact the internal space of the pipe pile, so that the bottom supporting plate is not needed to prevent core filling concrete from being exposed to the hollow part of the pipe pile.
The invention provides a deep buried pipe type prefabricated energy pipe pile and a construction process of the deep buried pipe type prefabricated energy pipe pile, wherein the construction process comprises the following steps:
1) Pile sinking equipment is adopted, and the prefabricated reinforced concrete pipe piles 5 are driven at specified positions according to the design scheme; when the precast reinforced concrete pipe piles 5 are multiple sections, pile bottoms and pile tops of two adjacent sections of precast reinforced concrete pipe piles 5 are subjected to head-to-tail pile splicing by a flange plate connecting method, a welding method and/or a slurry anchoring method;
2) Calculating pile driving depth according to the design requirement, and stopping pile driving when the pile driving reaches the design elevation; stopping pile delivery after pile delivery reaches a designed elevation, and if the leakage length of the precast reinforced concrete pipe pile 5 exceeds a design value, cutting part of the pipe pile exceeding the elevation by cutting equipment to expose a pile head;
3) Embedding a pile top heat exchange tube protection device 3 and fixing the protection device on the pile head of a precast reinforced concrete pipe pile 5 by adopting 4 anchor bolts 2;
4) Setting up a drilling machine, placing a pile casing and a drill rod from the inside of a fixing device of the precast reinforced concrete pipe pile 5 pile head, and vertically drilling downwards; when the depth of the vertical drilling hole is not less than 100 meters, the drill rod and the casing are pulled out;
5) Lowering the heat exchange tube 6 in the vertical drilling hole until the bottom end of the heat exchange tube 6 reaches the bottom of the vertical drilling hole, cutting off the exposed redundant part of the upper part of the heat exchange tube 6 and performing sealing protection;
6) Backfilling gaps between the heat exchange tubes 6 and the vertical drilling holes by adopting backfill 8, and reserving a sinking groove which is not more than 1m at the upper part of the precast reinforced concrete pipe pile 5;
7) A connection bearing platform reinforcement cage 1 is lowered in the sinking groove, the bottom end of the connection bearing platform reinforcement cage 1 is inserted into a backfill 8, and the upper part of the connection bearing platform reinforcement cage is fixed on the pile top of the precast reinforced concrete pipe pile 5 through transverse reinforcements;
8) Welding the horizontal heat exchange tube with the heat exchange tube 6 in the vertical drilling hole by using an elbow, sealing and protecting the port of the horizontal heat exchange tube, and paving a sand cushion layer of 5-10 cm at the bottom of the horizontal heat exchange tube for protection;
9) Pouring a foundation bearing platform or a foundation beam on the top of the precast reinforced concrete pipe pile 5 according to the design requirement of the top structure of the precast reinforced concrete pipe pile 5;
10 A horizontal heat exchange tube is connected with a water collecting and dividing device of the heat exchange system.
The structure and construction process of the present invention will be described in further detail with reference to the accompanying drawings and specific examples:
examples:
the upper pile length of the deep buried pipe type prefabricated energy pipe pile is 28m, and the depth of the deep drilling well at the lower part reaches 100m. Selecting and usingPrefabricating pipe pile specifications: the outer diameter is 400mm, the wall thickness is 95mm, the length of a single pile is 10m, and the pile body concrete strength C80. Corresponding pile top heat exchange the specification of the protection device is as follows: the outer diameter is 400mm, the inner diameter is 200mm, the height is 60mm, and the embedded depth is 80mm. The round reinforcement cage specification of the connection bearing platform: 6 main tendonsStirrup->The spacing is 200mm.
The implementation steps are as follows:
1) And adopting a static pile pressing machine to pile the precast reinforced concrete pipe pile at a designated position according to a design scheme, and adopting welding to pile the pile bottom and the pile top of the 3-section precast reinforced concrete pipe pile.
2) And (5) reaching the pile feeding depth of 28m according to the design requirement, and stopping pile feeding. The pile is cut to the designed elevation by a pile cutting machine, the pile head is exposed, and the floating slurry and sundries on the inner wall of the pile are cleaned.
3) And checking the consistency of the size of the pile top heat exchange tube protecting device and the prefabricated pipe pile, embedding the pile top heat exchange tube protecting device into the pile head, and fixing the pile top heat exchange tube protecting device on the pile head by utilizing 4 anchor bolts.
4) Setting up a drilling machine, wherein the diameter of a drill bit is 140mm, and the diameter of a deep drilling well is 150mm. And (5) setting down the pile casing and the drill rod from the inside of the pile head fixing device, and vertically drilling downwards. And (5) pulling out the drill rod and the casing after the drill hole is drilled to the depth of 100m.
5) The heat exchange tubes are connected in parallel in a double U mode, 4 heat exchange tubes are prepared according to Shan Bianchang m of the heat exchange tubes, and the bottom ends of the 4 heat exchange tubes are welded into two U shapes respectively. Two U-shaped heat exchange tubes connected are filled with water, and a pressure gauge is arranged on the air port, wherein the pressure gauge is not less than 12Kgf/cm 2 Pressure test ensures that the pipeline is intact. And (3) lowering the heat exchange tube, wherein the bottom end of the heat exchange tube reaches the bottom of the drilling hole, cutting off the exposed redundant part of the upper part and performing sealing protection.
6) Backfilling the deep drilling heat exchange well and the inner gap part of the prefabricated pipe pile at the upper part by adopting backfill, and reserving a 1m deep gap at the upper part of the pipe pile.
7) And a steel reinforcement cage of the connecting bearing platform is lowered, the bottom end of the steel reinforcement cage is inserted into the backfill, and the upper part of the steel reinforcement cage is fixed on the pile top through transverse steel bars.
8) And welding the horizontal inlet and outlet heat exchange pipes with the heat exchange pipes in the piles by using an elbow, sealing and protecting the ports of the horizontal inlet and outlet heat exchange pipes, checking the air tightness again, and paving a sand cushion layer with the thickness of 5-10 cm at the bottom of the horizontal heat exchange pipes for protection.
9) The inner wall of the top of the pipe pile is required to be cleaned, a treating agent is brushed, and the integrity of core filling concrete and pile body concrete of the pipe pile is ensured. And pouring a foundation bearing platform or a foundation beam according to the design requirement of the upper structure, wherein the mark of core filling concrete is C30, and pouring core filling concrete first.
10 The inlet and outlet heat exchange pipes are connected with a water collector and a water separator of the heat exchange system.
Claims (6)
1. The utility model provides a deep buried pipe formula prefabricated energy tubular pile which characterized in that: the deep buried pipe type prefabricated energy pipe pile comprises a prefabricated energy pipe pile (4), a deep drilling heat exchange well (7), a heat exchange pipe (6) and backfill (8); the prefabricated energy pipe pile (4) and the deep drilling heat exchange well (7) are coaxially arranged from top to bottom; vertical drilling holes are formed in the prefabricated energy pipe pile (4) and the deep drilling heat exchange well (7) along the axial direction of the prefabricated energy pipe pile (4); the whole heat exchange tube (6) is U-shaped; the heat exchange tube (6) extends from the top of the prefabricated energy pipe pile (4) to the bottom of the deep drilling heat exchange well (7); the backfill (8) is filled between the heat exchange tube (6) and the vertical drilling hole; the prefabricated energy pipe pile (4) comprises one or more sections of prefabricated reinforced concrete pipe piles (5); the prefabricated reinforced concrete pipe pile (5) and the deep drilling heat exchange well (7) are coaxially arranged from top to bottom; when the precast reinforced concrete pipe piles (5) are multi-section, the multi-section precast reinforced concrete pipe piles (5) are sequentially connected from top to bottom; the prefabricated energy pipe pile (4) further comprises a pile top heat exchange pipe protection device (3) which is arranged at the top of the prefabricated reinforced concrete pipe pile (5) at the top and used for protecting the prefabricated reinforced concrete pipe pile (5) and the heat exchange pipe (6); the prefabricated energy pipe piles (4) are arranged on the deep drilling heat exchange well (7) in parallel.
2. The deep buried pipe type prefabricated energy pipe pile according to claim 1, wherein: the pile top heat exchange tube protection device (3) comprises a prefabricated disc steel member and an anchor bolt (2); the prefabricated disc steel member is provided with an anchor bolt through hole and a heat exchange tube through hole; the heat exchange pipe (6) passes through the heat exchange pipe through hole and then extends from the top of the prefabricated energy pipe pile (4) to the bottom of the deep drilling heat exchange well (7); the anchor bolts (2) are used for connecting the prefabricated disc steel members with the top prefabricated reinforced concrete pipe piles (5) through anchor bolt through holes.
3. The deep buried pipe type prefabricated energy pipe pile according to claim 2, wherein: the heat exchange tube (6) is of a single U type, a double U series type or a double U parallel type.
4. A deep buried pipe type prefabricated energy pipe pile according to claim 3, characterized in that: the deep buried pipe type prefabricated energy pipe pile further comprises a connection bearing platform reinforcement cage (1) which is arranged at the top of the prefabricated energy pipe pile (4) and is arranged in the vertical drilling hole.
5. A construction process based on the deep buried pipe type prefabricated energy pipe pile according to claim 4, which is characterized in that: the construction process comprises the following steps:
1) Pile sinking equipment is adopted to sink the prefabricated reinforced concrete pipe pile (5) at a designated position according to a design scheme;
2) Calculating pile driving depth according to the design requirement, and stopping pile driving when the pile driving reaches the design elevation;
3) Embedding and fixing a pile top heat exchange tube protection device (3) in the pile head of the precast reinforced concrete pipe pile (5);
4) Setting up a drilling machine, placing a pile casing and a drill rod from the inside of a fixing device of a pile head of the precast reinforced concrete pipe pile (5), and vertically drilling downwards; when the depth of the vertical drilling hole is not less than 100 meters, the drill rod and the casing are pulled out;
5) Lowering the heat exchange tube (6) in the vertical drilling hole until the bottom end of the heat exchange tube (6) reaches the bottom of the vertical drilling hole, cutting off the exposed redundant part of the upper part of the heat exchange tube (6) and performing sealing protection;
6) Backfilling a gap between the heat exchange tube (6) and the vertical drilling hole by adopting a backfill (8), and reserving a sinking groove which is not more than 1m at the upper part of the precast reinforced concrete pipe pile (5);
7) A connection bearing platform reinforcement cage (1) is lowered in the sinking groove, the bottom end of the connection bearing platform reinforcement cage (1) is inserted into a backfill (8), and the upper part of the connection bearing platform reinforcement cage is fixed on the pile top of the precast reinforced concrete pipe pile (5) through transverse reinforcements;
8) And welding the horizontal heat exchange tube with the heat exchange tube (6) in the vertical drilling hole by using an elbow, sealing and protecting the port of the horizontal heat exchange tube, and paving a sand cushion layer of 5-10 cm at the bottom of the horizontal heat exchange tube for protection.
6. The construction process according to claim 5, wherein: when the precast reinforced concrete pipe piles (5) in the step 1) are multi-section, pile bottoms and pile tops of two adjacent sections of precast reinforced concrete pipe piles (5) are subjected to head-tail pile splicing through a flange plate connecting method, a welding method and/or a slurry anchoring method;
in the step 2), when pile delivery is stopped after the pile delivery reaches the designed elevation, if the exposed length of the precast reinforced concrete pipe pile (5) exceeds the designed value, cutting part of the pipe pile exceeding the elevation by adopting cutting equipment;
the step 8) further comprises the following steps:
9) Pouring a foundation bearing platform or a foundation beam on the top of the precast reinforced concrete pipe pile (5) according to the design requirement of the top structure of the precast reinforced concrete pipe pile (5);
10 A horizontal heat exchange tube is connected with a water collecting and dividing device of the heat exchange system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810119817.9A CN108166486B (en) | 2018-02-06 | 2018-02-06 | Deep buried pipe type prefabricated energy pipe pile and construction process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810119817.9A CN108166486B (en) | 2018-02-06 | 2018-02-06 | Deep buried pipe type prefabricated energy pipe pile and construction process thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108166486A CN108166486A (en) | 2018-06-15 |
| CN108166486B true CN108166486B (en) | 2024-02-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810119817.9A Active CN108166486B (en) | 2018-02-06 | 2018-02-06 | Deep buried pipe type prefabricated energy pipe pile and construction process thereof |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109098173A (en) * | 2018-09-28 | 2018-12-28 | 浙江工业大学 | A kind of prefabricated energy pile concrete tubular pile |
| US10774493B2 (en) * | 2018-11-16 | 2020-09-15 | Horst K. Aschenbroich | Hollow rebar for post-grouting the base of reinforced concrete drilled shafts |
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