CN1944806A - Low temperature geothermal energy converting cement and earth wet stirring pile - Google Patents
Low temperature geothermal energy converting cement and earth wet stirring pile Download PDFInfo
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- CN1944806A CN1944806A CNA2006100172836A CN200610017283A CN1944806A CN 1944806 A CN1944806 A CN 1944806A CN A2006100172836 A CNA2006100172836 A CN A2006100172836A CN 200610017283 A CN200610017283 A CN 200610017283A CN 1944806 A CN1944806 A CN 1944806A
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- cement
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
- F24T10/10—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground
- F24T10/13—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes
- F24T10/15—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes using bent tubes; using tubes assembled with connectors or with return headers
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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
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- General Life Sciences & Earth Sciences (AREA)
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- Sustainable Energy (AREA)
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The low temperature geothermal energy converting soil cement wet stirring pile has tubular heat exchanger inserted into soil cement wet stirring pile for bearing, retaining, supporting, reinforcing foundation and converting shallow low temperature geothermal energy. The tubular heat exchanger inserted before the soil cement wet stirring pile solidifies may be one U-tube heat exchanger, one coil heat exchanger or one heat exchanger in other shape. The tubular heat exchanger is connected to ground pipeline and filled with heat exchange fluid. Through heat exchange between the heat exchange fluid inside the tubular heat exchanger and the soil cement pile and the heat exchange between the soil and water around the pile, one closed underground geothermal energy heat exchanger with geothermal heat pump is formed.
Description
Affiliated technical field:
The present invention relates to ground stabilization, the building foundation pit support technology combines with closed ground source heat pump technology, be that a kind of utilize in the lower pile body of cement and earth wet stirring pile primary strength inserted the tubulose heat exchanger apparatus and carried out the cryogenically cement and earth wet stirring pile of thermal power transfer, this device not only has the carrying of traditional pile foundation but also possess the cryogenically multifunctional water earth wet stirring pile of heat energy cycle heat exchange ability.
Background technology:
At present, known cement and earth wet stirring pile is meant that mainly utilizing cement and earth wet to stir the cement-soil that forms adds solid, can be used as the composite foundation of vertical carrying; Base pit engineering is gone along with sb. to guard him a grade wall, passive area reinforcing, seepage proof curtain and large volume cement stabilized soil etc.Add solid shape and can be divided into column, wall shape, grid-like or bulk etc.Stirring-head can be single head or double end, and pile body becomes column type or local overlapping bicylindrical type, is main as reinforced material with cement, and decide according to construction machinery, designing requirement in the stake footpath, and general single pile directly is 700mm.The diameter of different model cement and earth wet stirring pile, mechanical property, reinforced material and structure require, design, select for use, produce aspects requirements such as examinations, pile and all meet (JGJ120-99) middle respective specified of People's Republic of China's industry standard " building lot treatment technology standard " (JGJ 79-2002), " Code for design of building " (GB 50007) and " building foundation pit supporting tecnical regulations ".At disclosed existing known technology, existing several improvement patents, ZL95117076.7, ZL97111925.2, the open disclosed several improvement cement and earth wet stirring piles of book of the application for a patent for invention of ZL98125100.5 are to realize like this, joint bar or linked network sprayed mortar etc. in cement-soil, SMW (Soilmixing Wall) worker's method that introduce from Japan the other eighties in 20th century, promptly in agitation pile, insert H shaped steel, if supporting class temporary works, H shaped steel be can extract after engineering is finished out and (Zhang Pu, Liu Ronghua, the application of SMW worker's method in deep-foundation pit engineering utilized again, rock mechanics and engineering journal, 2000 (19): 1104-1107),, things such as the reinforcing bar of insertion or mao bamboon are also arranged to increase pile body rigidity in addition for reducing cost.
The structure of each bore cement and earth wet stirring pile generally is to join and compare, have (nothing) to insert reinforcing bar formations such as (H shaped steel, mao bamboons etc.) by the difference that participates in different reinforced materials, reinforced material, cross section is the pile foundation between rigid pile and flexible pile of circular or local overlapping Double Circle, plays effects such as carrying, retaining support, ground stabilization.But the function of still not having the geothermic gradient utilized, this has ignored the heat exchange effect of burying of cement and earth wet stirring pile.And in the middle-latitude zone, ground temperature is compared with ground environment, the following annual ground temperature of 5-10m can be stable at year-round average temperature substantially, can be respectively provide in two seasons of winter in summer relatively low condensation temperature and higher evaporating temperature (Gaoqing, in ring, the development and utilization of efficient height, heating and cooling equipment one earth source heat pump that environmental protection efficacy is good, the Jilin Industry University natural science journal, in April calendar year 2001, Vol.31 (2): 96-102), this is the operating principle of earth source heat pump.The pipe laying method of ground source heat pump technology mainly is that U type polyethylene pipe is directly buried in prebored hole underground at present, its expense is very high,-as can account for the over half of gross investment, initial cost (Jiang Baocheng, the Wang Yong boomerang of electric heat pump under the same terms etc., LiBing Xi, the Technological Economy evaluation of earth source heat pump, Harbin Institute of Technology's journal, the 35th the 2nd phase of volume of February in 2003,195-202), this causes difficulty for the development of this technology.In addition, this boring direct burial U type tubular exchanger construction technology complexity, need be in U type pipe bend portion colligation weight increases counterweight, U type pipe pre-filling heat-exchange fluid, manage down with manpower, effort and precision are difficult to guarantee (village winter jasmine, Sun Youhong, the construction of the underground direct burial heat exchanger of earth source heat pump, mineral exploration engineering (rock and soil drilling engineering), 2002, No.3:10-11).About pipe laying in the stake, the domestic people of having proposed the notion of U type stake buried tube heat exchanger, but this method in essence still the boring of traditional earth source heat pump directly bury the improvement of U type heat exchanger tube underground, only the filler in the boring is changed into cement paste, do not consider the carrying problem.(Zhao Jun, Li Xinguo etc., earth source heat pump be in actual application in engineering and research, building construction technology (tianjin building science and technology), and 2003, No.5:14-16).Though external also someone put forward the notion that heat exchanger is buried in stake, but all be based on high-strength polyethylene U type coil pipe concrete spouting solid section stake (Laloui Lyesse, Moreni Matteo, Vulliet Laurent, Behavior of abi-functional pile, foundation and heat exchanger, Canadian Geotechnical Journal, v 40, and n 2, April, 2003, p388-402.), these based on the shortcoming of burying tubular exchanger in boring or the various cast-in-place concrete pile underground are: boring expense height, coil heat exchanger construction in the cast-in-place concrete pile is complicated, needs operations such as coil pipe assembling reinforcement cage.And the coil pipe position local material softened zone and stress can occur and concentrates in all kinds of solid section stakes, influence pile quality, to traditional load-carrying properties generation detrimental effect of pile foundation.The tubular exchanger of various in addition polyethylene materials is extruded the risk of destruction in addition.
Summary of the invention
What is called is heat energy (Low Temperature Earth-heat-energy) cryogenically, is meant the low-temperature heat energy that absorbs solar energy, geothermal energy in surface soil, underground water or river, the lake and contain.Existing cement and earth wet stirring pile is only considered to carry in order to overcome, support action and ignore the function that it utilizes the geothermal using gradient, and it is complicated and to the reality of the adverse effect of concrete spouting pile foundation to change the construction of expensive, all kinds of tubular exchanger of closed ground source heat pump technology initial bore hole, the present invention can provide a kind of low temperature geothermal energy converting cement and earth wet stirring pile, this pile foundation can not only carrying, retaining support, ground stabilization, and can carry out the cryogenically closed circulation conversion of heat energy of shallow-layer easily.
The technical solution adopted for the present invention to solve the technical problems is: the cement and earth wet stirring pile that the present invention adopts is just the same with stake type, size, mechanical property, raw material and structure requirement, design, type selecting, production examination, the pile of at present normal cement and earth wet stirring pile, all by national existing relevant specification (People's Republic of China's industry standard " building lot treatment technology standard " (JGJ 79-2002), " Code for design of building " (GB 50007) and " building foundation pit supporting tecnical regulations " are (JGJ120-99)) execution.
After the cement and earth wet stirring pile construction is finished, in stirring pile body, pass through the tubular exchanger of manpower or mechanical underlying high-strength polyethylene or PVC or PPR material immediately, caliber is generally 19mm-38mm, it is long that the pipe vertical height is equal to stake approximately, its tubular exchanger bottom is apart from the sharp 1m-2m of stake, its tubular exchanger outlet makes progress and the certain thickness heat insulating material of colligation, the length of colligation is about 0.5m-2.0m, the outer span pile tube inwall of tubular exchanger is between 50mm-100mm, and shape can be a U type heat exchanger tube, the screw type coil pipe, other type heat exchanger tube in thimble tube heat exchanger tube or " boring direct burial " method.Operation mechanism according to earth source heat pump, these tubular exchangers are fixed in the agitation pile pile body, filling heat-exchange fluid in the tubular exchanger, this fluid adopts water, salt solution or various antifreezing agent solution usually, form cryogenically heat energy circulating system of enclosed type, each model earth source heat pump unit of face of land exchange pipeline, water pump and the satisfied actual different capacity that requires is installed.Thermostat layer by the exchange media in the tubular exchanger and backfilling material, pile body and shallow soil water system carries out the cycling hot exchange, and reach the purpose that energy transforms by the earth source heat pump unit, play the effect of central air-conditioning, if auxiliary then can provide central hot water system institute calorific requirement with devices such as central heaters.
The invention has the beneficial effects as follows, can be in the traditional carrying of performance cement and earth wet stirring pile, retaining support, ground stabilization, the tubular exchanger that is pressed in stirring pile body promptly can improve the rigidity of agitation pile, can carry out the closed circulation conversion of superficial part geothermal energy again easily, tubular exchangers such as the U type pipe in these stirring pile bodies, screw type coil pipe, can play the same effect of traditional closed earth source heat pump boring pipe laying, but save the correlative charges of prebored hole.And the temperature load effect that cycle heat exchange produces does not have influence to pile foundation traditional mechanics ability in the working range of soil-cement.
All kinds of tubular exchanger technology are set in the stirring pile body that adopts in this pile foundation can eliminate the various defectives of buried tube heat exchanger solid section castinplace pile (in the solid section castinplace pile because the pile body local material softened zone that polyethylene exchange pipe causes), can reach all indexs of the embedding heat exchanger of vertical drilling fully.In addition, this technology can also be provided with the spacing of tubular exchanger flexibly, is example with U type heat exchanger tube, can require to be provided with the U type heat exchanger tube of 1m or 2m spacing according to heat requirement, also can one group of U type heat exchanger tube be set every a pile.Tubular exchanger is in stirring pile body, can play the effect of traditional inserts such as reinforcing bar, mao bamboon, do not influence the normal construction efficient of agitation pile, only be after conventional mixing pile construction finishes, to finish the insertion heat exchanger tube rapidly, reason is to finish the operation of inserting tubular exchanger before soil cement intensity improves, otherwise will be difficult to insert.The problems such as undergauge, the quicksand that may occur, the hole of collapsing because this construction technology can be avoided holing, stir pile body simultaneously and also play the effect of borehole casing, thereby make and in stirring pile body, bury heat exchanger underground and be able to smooth construction, greatly having improved the constructional difficulties that tubular exchanger is buried in boring underground.
Secondly because the tubular exchanger itself in the low temperature geothermal energy converting cement and earth wet stirring pile pile body has good intensity, can save the cost of materials and the labour cost of the slotting reinforcing bar (H shaped steel, mao bamboon etc.) of conventional agitation pile, also strengthen the whole mechanical property of agitation pile stake simultaneously.Last because heat exchange tube diameter, material can Artificial Control, can dispose optimum heat exchanger tube according to different areas, different geological conditions, to increase heat exchanger effectiveness and to improve pile strength.
This technology at first is a kind of of closure earth source heat pump, has the innate advantage of closed ground source heat pump technology.It can eliminate the groundwater pollution problem in the source heat pump technology openly, also can avoid the operating groundwater resources usage charges of open system.Secondly at the closed ground source heat pump technology prebored hole of tradition, directly bury the not high construction shortcoming of complex procedures, precision such as U type heat exchanger tube underground, and the expensive excessive problem of ground source heat pump technology initial outlay that causes of whole embedding heat exchanger, this pile foundation technology can be avoided prebored hole and bury the heat exchanger tube cost underground, the construction problem that only this item cost-saved nearly half and the direct-burried heat exchanger tube of avoiding holing bring.The various heat exchanger tube of different spacing can be set in the pile foundation in addition flexibly: U type heat exchanger tube, screw type coil pipe or their combination, further reduce construction cost.As seen these technical measures will lower the comprehensive cost of whole earth source heat pump, earth source heat pump itself has the environmental protection and energy saving function, and China is manually cheap, cement and earth wet stirring pile market is huge, if cooperate promoting the use of of present technique, to bring hundreds of millions of economic benefits and environmental benefit every year, can save a large amount of non-renewable strategic resources such as oil coal for country again.
Description of drawings:
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is an earth source heat pump schematic diagram of the present invention.
Fig. 2 is the low temperature geothermal energy converting cement and earth wet stirring pile constructional drawing.
Fig. 3 is the D structure figure of one group of U type heat exchanger tube.
Fig. 4 is the drawing in side sectional elevation of Fig. 2.
Fig. 5 is a low temperature geothermal energy converting cement and earth wet stirring pile bracing of foundation pit barricade constructional drawing.
Fig. 6 is the low temperature geothermal energy converting cement and earth wet stirring pile bracing of foundation pit barricade sectional drawing of excavation of foundation pit.
Fig. 7 is the constructional drawing of the built-in screw type heat exchange coil of low temperature geothermal energy converting cement and earth wet stirring pile.
Fig. 8 is the constructional drawing of the built-in thimble tube heat exchanger of low temperature geothermal energy converting cement and earth wet stirring pile.
1. low temperature geothermal energy converting cement and earth wet stirring piles among the figure, 2. superficial part soil layer, 3. face of land exchange pipeline, 4. earth source heat pump unit, 5. building, 6. replacement fluids flows into, 7. replacement fluids returns, 8.U type tubulose heat exchanger tube, 9. replacement fluids in the pipe, 10. cement-soil, 11. the stake outer wall, 12. water inlet pipes, 13. outlet pipes, 14. the screw type heat exchange coil, 15. thimble tube heat exchanger tubes
The specific embodiment:
In Fig. 1, earth source heat pump is the low-temperature heat energy that utilizes the shallow surface geothermal energy resources, the heat-exchange fluid that change in tubular exchanger in cement and earth wet stirring pile (1) by geothermal energy winter comes out the heat extraction in the superficial part soil layer (2), by face of land exchange pipeline (3) and the heating of earth source heat pump unit (4) supply building (5); Take out building (5) heat summer, is discharged in the superficial part soil layer (2) by the heat-exchange fluid in the tubular exchanger (1) in the face of land exchange pipeline (3), earth source heat pump unit (4) and the cement and earth wet stirring pile and goes.
In embodiment illustrated in fig. 2, low temperature geothermal energy converting cement and earth wet stirring pile (1), there is multiple regulation in its footpath, and whole pile body is that cement-soil soil (10) is formed.One group of the underlying placed in the middle polyethylene of shape or the U type heat exchanger tube (8) of PVC or PPR material as shown in Figure 3 in the pile body, U type heat exchanger tube (8) outer apart from the distance of pile body outer wall (11) between 50mm-100mm, length is than stake length 1m, and heat exchanger (8) finally is positioned in the cement and earth wet stirring pile pile body.Stake among Fig. 2 that Fig. 4 showed (1) drawing in side sectional elevation, the position of U type heat exchanger tube (8) in cement mixing pile (1), return (7) by replacement fluids inflow (6) and replacement fluids, make the interior replacement fluids (9) of pipe in the U type tubular exchanger (8) carry out interchange of heat with cement-soil (10), superficial part soil layer (2).Fig. 5 shows is the constructional drawing of low temperature geothermal energy converting cement and earth wet stirring pile (1) during as the bracing of foundation pit barricade, Fig. 6 be among Fig. 5 when excavation of foundation pit, low temperature geothermal energy converting cement and earth wet stirring pile (1) bracing of foundation pit barricade sectional drawing.
In another embodiment shown in Figure 7, low temperature geothermal energy converting cement and earth wet stirring pile (1) built-in helical disk cast heat exchanger tube (14).Helical disk cast heat exchanger tube (14) is made of polyethylene or PVC or PPR material, screw type coil pipe (14) length is than stake length 1m-2m, directly be down-set in the cement mixing method body between two parties, and the circumferential distance of stake outer wall (11) is between 50mm-100mm, Fig. 8 is seen apart from the sharp 1m-2m of stake in helical disk cast heat exchanger tube (14) bottom.Return (7) by replacement fluids inflow (6) and replacement fluids, make the interior replacement fluids (9) of pipe in the helical disk cast heat exchanger tube (14) carry out interchange of heat with cement-soil (10), superficial part soil layer (2).
In another embodiment shown in Figure 8, the built-in thimble tube heat exchanger tube of low temperature geothermal energy converting cement and earth wet stirring pile (1) (15).Thimble tube heat exchanger tube (15) is made of polyethylene or PVC or PPR material, thimble tube heat exchanger tube (15) length is than stake length 1m-2m, directly be down-set in the cement mixing method body between two parties, and the circumferential distance of stake outer wall (11) is between 100mm-200mm, Figure 10 is seen apart from the sharp 1m-2m of stake in thimble tube heat exchanger tube (15) bottom.Return (7) by replacement fluids inflow (6) and replacement fluids, make the interior replacement fluids (9) of pipe in the thimble tube heat exchanger tube (15) carry out interchange of heat with cement-soil (10), superficial part soil layer (2).
Claims (9)
1. low temperature geothermal energy converting cement and earth wet stirring pile, in the pile body of cement and earth wet stirring pile, direct other type heat exchanger tube in underlying U type tubular exchanger or screw type coil heat exchanger or " boring direct burial " method.All kinds of tubular exchangers of the pile body of cement and earth wet stirring pile are connected with face of land pipeline, filling replacement fluids in the heat exchange manifold, carry out interchange of heat by the replacement fluids in the tubular exchanger system and cement-soil pile body, all soil-water systems of stake, form the underground low temperature geothermal energy interchanger of closed earth source heat pump.
2. low temperature geothermal energy converting cement and earth wet stirring pile according to claim 1, it is characterized in that: insert other type heat exchanger tube in U type tubular exchanger or screw type coil heat exchanger or " boring direct burial " method in the present technique in the pile body of cement and earth wet stirring pile, its cement and earth wet stirring pile that adopts is just the same with stake type, size, mechanical property, raw material and structure requirement, design, type selecting, production examination, the pile of the cement and earth wet stirring pile of present routine, all carries out by national relevant specification.
3. low temperature geothermal energy converting cement and earth wet stirring pile according to claim 1, it is characterized in that: in the cement and earth wet stirring pile work progress that present technique adopts, must when soil cement intensity is low, insert tubular exchanger, be preferably in mixing pile construction and carry out at once afterwards.
4. low temperature geothermal energy converting cement and earth wet stirring pile according to claim 1, it is characterized in that: after the cement and earth wet stirring pile construction is finished, the tubular exchanger that inserts all kinds of high-strength polyethylenes or PVC or PPR material placed in the middle in pipe, caliber is 19mm-38mm, it is long that the vertical height of tubular exchanger is equal to stake approximately, its tubular exchanger bottom is apart from the sharp 1m-2m of stake, and the outer span agitation pile outer wall of tubular exchanger is between 50mm-100mm.
5. low temperature geothermal energy converting cement and earth wet stirring pile according to claim 1, it is characterized in that: the tubular exchanger of all kinds of high-strength polyethylenes of underlying or PVC or PPR material in the pile tube pipe, its shape can be the tubular exchanger of U type tube shape heat exchanger tube, screw type coil shape heat exchanger or other shape, all kinds of tubular exchangers and become the underground cycle heat exchange system of earth source heat pump down in the agitation pile pile body.
6. low temperature geothermal energy converting cement and earth wet stirring pile according to claim 1 is characterized in that: the insertion method that all kinds of tubular exchangers of underlying adopt can be manpower method or mechanical means.
7. low temperature geothermal energy converting cement and earth wet stirring pile according to claim 1, it is characterized in that: being placed in all types of tubular exchangers in the pile body needs the filling heat-exchange fluid, this fluid adopts water, salt solution or various antifreezing agent solution, forms the enclosed type circulating system.
8. low temperature geothermal energy converting cement and earth wet stirring pile according to claim 1, it is characterized in that: the tubular exchanger outlet makes progress and the certain thickness heat insulating material of colligation, the length of colligation is about 0.5m-2.0m, and the tubular exchanger system of formation connects face of land exchange pipeline, water pump and satisfies each model earth source heat pump unit of the actual different capacity that requires.
9. low temperature geothermal energy converting cement and earth wet stirring pile according to claim 1, it is characterized in that: be placed in the U type tubular exchanger system in the pile body or the tubular exchanger system of screw type coil heat exchanger system or other shape, its spacing distance is adjustable flexibly, 1m, 2m can be set or transfer stake at interval.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006100172836A CN1944806A (en) | 2006-10-31 | 2006-10-31 | Low temperature geothermal energy converting cement and earth wet stirring pile |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2006100172836A CN1944806A (en) | 2006-10-31 | 2006-10-31 | Low temperature geothermal energy converting cement and earth wet stirring pile |
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| CN1944806A true CN1944806A (en) | 2007-04-11 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101761070B (en) * | 2010-01-13 | 2012-10-17 | 浙江大东吴集团建设有限公司 | Brick pile structure |
| CN102995627A (en) * | 2012-11-22 | 2013-03-27 | 河海大学 | Geothermal energy collecting pile foundation and construction method thereof |
| CN103306274A (en) * | 2013-07-04 | 2013-09-18 | 宁夏回族自治区电力设计院 | Sintering pile and method for manufacturing sintering pile |
| CN113585243A (en) * | 2021-08-11 | 2021-11-02 | 中铁大桥局集团有限公司 | Cast-in-situ bored pile and construction method thereof |
-
2006
- 2006-10-31 CN CNA2006100172836A patent/CN1944806A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101761070B (en) * | 2010-01-13 | 2012-10-17 | 浙江大东吴集团建设有限公司 | Brick pile structure |
| CN102995627A (en) * | 2012-11-22 | 2013-03-27 | 河海大学 | Geothermal energy collecting pile foundation and construction method thereof |
| CN102995627B (en) * | 2012-11-22 | 2015-04-08 | 河海大学 | Geothermal energy collecting pile foundation |
| CN103306274A (en) * | 2013-07-04 | 2013-09-18 | 宁夏回族自治区电力设计院 | Sintering pile and method for manufacturing sintering pile |
| CN113585243A (en) * | 2021-08-11 | 2021-11-02 | 中铁大桥局集团有限公司 | Cast-in-situ bored pile and construction method thereof |
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