CN102518129B - Post pressure-grouting pre-stressed hollow square pile and manufacturing method thereof - Google Patents
Post pressure-grouting pre-stressed hollow square pile and manufacturing method thereof Download PDFInfo
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Abstract
The invention provides a post pressure-grouting pre-stressed hollow square pile and a manufacturing method thereof. The pile has the characteristics that pressure resistance and uplift resistance are high; the horizontal thrust resistance of the square pile is also greatly improved; the manufacturing method is simple; the operation is convenient and the like. Simultaneously, a pile side mud jack is located at the joint of pipe joints; the peripheries of the pipe joints are tightly encircled by grout, thus, an anticorrosion protection action can be performed on pipe joint connecting iron accessories; simultaneously, the grout has a seepage protection action on microcracks of a pile body, and an anti-seepage effect can be achieved. By adopting the method, the vertical bearing capacity of the pre-stressed hollow square pile can be increased by 30-50 percent; if a steel pipe is adopted to serve as a mud jacking pipe, the horizontal thrust resistance of the square pile can be increased by at least 50 percent; simultaneously, the use level of reinforcing steel bars is reduced; if the post pressure-grouting pre-stressed hollow square pile is used as an uplift pile, the uplift resistance of the pile body can be increased by at least 50 percent; in underground water corrosion regions, the problem of the cracks of the pile body can also be effectively solved; the comprehensive manufacturing cost can be saved by at least 40 percent; and the post pressure-grouting pre-stressed hollow square pile has obvious social and economic benefits.
Description
Technical field
The present invention relates to do in civil works basic technology, particularly a kind of structure of rear mud jacking pre-stress hollow square pile.
Background technology
Pre-stress high-strength concrete hollow square pile (HKFZ) is a kind of pile foundation form at international pile foundation engineering field comparative maturity, and domestic many enterprises introduce domestic by this stake one after another in recent years.My company began just this kind of stake type to be studied from 2005, had done experiment work the batch production of a large amount of terms of mechanics.This kind of stake type because it is high-strength, economy, Production Time is short, technique is simple, can batch production production etc. advantage, there is use value widely.
At present, international and domestic many engineerings have all been used this kind of stake type in a large number.This kind of stake type is owing to adopting High Strength Concrete, and pile strength is up to 80Mpa, but because the bearing capacity of single pile is to be determined by the minimum value in pile strength and the native frictional resistance of stake, therefore the strength advantage of pile body is brought into play far away.For this reason, colleague adopts kinds of processes both at home and abroad, to improving its bearing capacity, and some employing high-pressure rotary jet grouting pile lock pins; Some employing deep-mixed pile lock pins; The first reaming having pile sinking grouting behind shaft or drift lining etc. again.Structure like that, although obtained certain effect, often, because the cooperation of needs plurality of devices, complicated construction technique, effect are low or high cost, could not be promoted preferably.Therefore, how to adopt a kind of better simply structure, improve the mechanical property of HKFZ square pile, become one technical barrier of a pendulum in face of us.
Summary of the invention
The object of the invention is to provide a kind of rear mud jacking pre-stress hollow square pile and preparation method, make up above-mentioned deficiency, be beneficial to provide that high, the horizontal bending resistance shear behavior of bearing capacity of single pile is good, shock resistance is strong, in building loss few, material-saving, from the pre-stress hollow square pile of heavy and light and convenient operation.
Another object of the present invention is to provide that a kind of pile body ductility of making is good, and high, the horizontal bending resistance shear behavior of bearing capacity of single pile is good, shock resistance is strong, in building loss few, material-saving, from the preparation method of the pre-stress hollow square pile of heavy and light.
The technical solution used in the present invention is to provide a kind of manufacture method of rear mud jacking pre-stress hollow square pile, the profile of described hollow square pile is square prism, central authorities are the structure of hollow cylinder, stake two ends are provided with square endplate, skirtboard, in pile body, there is reinforcing cage, main muscle is prestressed steel bar, the two ends of described pile body are respectively equipped with upper head plate and the bottom plate that shape is identical, on the face of upper head plate and bottom plate, be arranged with at least respectively a pair of connector, the end of the stake up and down surrounding of described pile body is provided with the skirtboard being connected with upper head plate and bottom plate; Described pile body end plate inner side be provided be communicated with the connector sealing of four jiaos of upper head plates be connected short tube or tee piece, the horizontal tube of tee piece is connected place to be left same bore circular hole and is tightly connected with skirtboard, the interior madjack pipe of the connector that bottom plate is four jiaos by pile body be connected short tube and dock; Or the connector of four jiaos of bottom plates is connected by the interior madjack pipe of pile body and the pipe up and down of tee piece; The method includes following steps:
1. by complete in the welding of end plate processing plant to the end plate up and down of pre-stress hollow square pile and skirtboard, in welded end plate, connect short tube or tee piece simultaneously, then compile cage workshop by complete with above-mentioned assembly welding the reinforcing cage of the finishing end plate with connection short tube or tee piece together with assembling steel reinforcement cage, after the assembling of reinforcing cage and end plate, on the spot by madjack pipe be welded on the end plate of two ends be connected short tube or tee piece fits together;
In the time that madjack pipe is plastic pipe, reserved stretching extension length; While being steel pipe as madjack pipe, should in the middle of madjack pipe, flexible valve be set, flexible valve is placed on centre or the two-end part of madjack pipe, and it is airtight that flexible valve adopts the rubber car inner tube of a tyre to carry out, and two ends clamp with clip, and flexible valve length is 200～250mm;
2. madjack pipe installs, all connectors on employing plug or stopper sealing two ends end plate and the external opening of skirtboard and tee piece, inspection madjack pipe is guaranteed to be connected firmly with the connecting portion that is connected short tube or tee piece, while avoiding stretch-draw, throw off, and adopt adhesive tape airtight, in order to avoid cement paste enters in madjack pipe; The flexible valve overcoat caulking gum car inner tube of a tyre, both sides clamp with clip, and the caulking gum car inner tube of a tyre should at least be reserved 200mm collapsing length;
3. after above-mentioned work completes, enter the formative stage of finished peg, enter mould, concreting, matched moulds, the main muscle stretch-draw of prestressing force and high speed centrifugation through reinforcing cage, through High-temperature Curing, form removal and pile after high-pressure steaming and cultivating again.
Effect of the present invention is the structure that adopts this square pile, stake end, stake side simultaneously mud jacking can improve bearing capacity 40～50%, the vertical bearing capacity of pre-stress hollow square pile can improve 30～50%, as adopt steel pipe as madjack pipe, square pile opposing horizontal thrust can improve more than 40%, reduce amount of reinforcement, as improved 35～40% left and right to pile body uplift resistance as uplift pile simultaneously.The preparation method of this square pile is simple, convenient operation; because stake side pressure grouting is positioned at tube coupling junction, slurries are tightly encircled tube coupling surrounding, can connect ironware to tube coupling and play anticorrosion, protective effect simultaneously; slurries are sewed with seepage flow protective effect to pile body fine fisssure simultaneously, can improve impervious effect.Underground water corrosion area can also effectively solve pile body crack problem, and comprehensive cost can be saved more than 40%, has obvious social and economic benefits.
Brief description of the drawings
Fig. 1 is rear mud jacking square pile front view of the present invention;
Fig. 2 is 450 × 450 above precast square pile structural representations that are applicable to of the present invention;
Fig. 3 is underground water corrosion area 400 × 400 following sections that are applicable to of the present invention;
Fig. 4 is the A portion enlarged drawing of Fig. 1;
Fig. 5 is the B portion enlarged drawing of Fig. 1;
Fig. 6 be precast pile tip full-page proof with mud jacking valve of the present invention and with square pile connection layout;
Fig. 7 is the C portion enlarged drawing of Fig. 1;
Fig. 8 is that steel pipe of the present invention is while doing madjack pipe, for reply prestressed stretch-draw extends the stretching device drawing of taking.
In figure:
1. end plate 2. end plate connector 3. skirtboards 4. connect 6. of short tube 5. connecting tee pipes top and connect 17. sides of body that the cement solidifies at the bottom of 16. of 11. top madjack pipes of short tube 7. madjack pipe 8. connecting insertion 9. sealing ring 10. cement pastes, the 12. mud jacking equipment 13. pile top end plate 14. mud jacking valve 15. pile tops body 18. steel pipe madjack pipe stretching device 19. rubber car inner tube of a tyre 20. clips that the cement solidifies
Detailed description of the invention
By reference to the accompanying drawings and embodiment rear mud jacking pre-stress hollow square pile of the present invention and preparation method are illustrated.
The design philosophy of rear mud jacking pre-stress hollow square pile of the present invention is based on starting with from rear mud jacking, by set up madjack pipe in preformed pile, pass through post-grouting technology, form respectively the expansion body that thes cement solidifies at stake end and stake side by the continuous extrusion soil of cement grout, thereby form high-bearing capacity, high uplift resistance, high horizontal force resistant and rear mud jacking pre-stress hollow square pile anticorrosion, good seepage-proof property.
Rear mud jacking pre-stress hollow square pile of the present invention, this hollow square pile is that a kind of profile is square prism, central authorities are the structure of hollow cylinder, stake two ends are provided with square endplate, skirtboard, in pile body, have reinforcing cage, main muscle is prestressed steel bar, and the two ends of described pile body are respectively equipped with upper head plate 1 and the bottom plate 1 that shape is identical, on the face of upper head plate 1 and bottom plate 1, be arranged with at least respectively a pair of connector 2, the end of the stake up and down surrounding of described pile body is provided with the skirtboard 3 being connected with upper head plate and bottom plate; Described pile body end plate inner side be provided be communicated with connector 2 sealings of 1 four jiaos of upper head plates be connected short tube 4 or tee piece 5, the horizontal tube of tee piece 5 is connected place to be left same bore circular hole and is tightly connected with skirtboard 3, the interior madjack pipe 7 of the connector 2 that bottom plate is four jiaos by pile body be connected short tube 4 and dock; Or the connector 2 of four jiaos of bottom plates is connected by the interior madjack pipe 7 of pile body and the pipe up and down of tee piece 5.
The connector 2 of described upper head plate 1 and bottom plate 1 is two or four, in the time establishing four holes, is arranged symmetrically in the Si Jiaochu on end plate face, in the time being two holes, and diagonal angle setting.
Described madjack pipe 7 is two or four, and madjack pipe 7 is plastic pipe or steel pipe.
The manufacture method of rear mud jacking pre-stress hollow square pile of the present invention includes following steps:
1. by complete in the welding of end plate processing plant to the end plate up and down 1 of pre-stress hollow square pile and skirtboard 3, the interior connection short tube 4 of welded end plate 1 or tee piece 5 simultaneously, then compile cage workshop by complete with above-mentioned assembly welding the reinforcing cage of the finishing end plate 1 with connection short tube 4 or tee piece 5 together with assembling steel reinforcement cage, after the assembling of reinforcing cage and end plate, on the spot by madjack pipe 7 be welded on the end plate of two ends be connected short tube 4 or tee piece 5 fits together;
In the time that madjack pipe 7 is plastic pipe, duct length should be reserved 200mm stretching extension length;
While being steel pipe as madjack pipe 7, should in the middle of madjack pipe 7, flexible valve 18 be set, flexible valve 18 can be placed on centre or the two-end part of madjack pipe 7, but with more obvious near prestressing force pull end effect; It is airtight that flexible valve 18 adopts the rubber car inner tube of a tyre 19 to carry out, and two ends clamp with clip 20, and flexible valve 18 length are 200～250mm;
2. madjack pipe 7 installs, all connectors 2 on employing plug or stopper sealing two ends end plate and the external opening of skirtboard and tee piece 5, inspection madjack pipe 7 is guaranteed to be connected firmly with the connecting portion that is connected short tube 4 or tee piece 5, while avoiding stretch-draw, throw off, and adopt adhesive tape airtight, in order to avoid cement paste enters in madjack pipe 7; The flexible valve 18 overcoat caulking gum car inner tubes of a tyre 19, both sides clamp with clip 20, and the caulking gum car inner tube of a tyre 19 should at least be reserved 200mm collapsing length;
3. after above-mentioned work completes, enter the formative stage of finished peg, enter mould, concreting, matched moulds, the main muscle stretch-draw of prestressing force and high speed centrifugation through reinforcing cage, through High-temperature Curing, form removal and pile after high-pressure steaming and cultivating again.
Finished product pre-stress hollow square pile of the present invention is transported to behind building site, should first remove plug or the stopper of the mouth of pipe before hello stake.According to designing requirement, two kinds of the general point with stake point of precast square pile construction or non-with stake points, to the first situation, before first segment pile driving construction, first mounting strap valve pile top 15 at the bottom of stake, first the second situation should install mud jacking valve 14 in bottom, then start pile sinking.
Then, 1 meter to ground of lower joint pile driving construction carries out before pile extension, should first on the bottom plate 1 of upper joint stake, connecting insertion 8 be installed and sealing ring 9 is installed, then will save up and down stake alignment falls, now connecting insertion 8 directly falls into the connector 2 of lower joint pile end plate, under the sealing of upper joint stake deadweight and sealing ring, the inner mud jacking pipeline of pile body is connected smoothly, then adopts angle steel will save up and down stake and is welded together;
Then, stake is sink to behind ground, stake top mud jacking pipeline is installed, stake top is connected to short tube 6 and connect with 2 of connectors on stake headboard 1, then stake top madjack pipe 11 be connected firmly and guarantee airtightly with being connected short tube 6, finally adopting special Pile feeder that stake is delivered to design elevation.Finally the stake top madjack pipe 11 basseting is connected with ground mud jacking equipment 12, equipment debugging is complete, starts mud jacking construction, progressively by slurries 10 pressure pile top madjack pipe 11 and madjack pipes 7, and the through stake end and stake side.
Finally, mud jacking liquid 10 can be cement paste, cement mortar or remaining slurry waste material; Mud jacking equipment 12 grouting pressures are 1～3Mpa; Can adopt stake end and stake side mud jacking simultaneously, also can only carry out mud jacking to stake end; Slurries solidify and form stake end body 16 and the stake side body 17 that thes cement solidifies that thes cement solidifies at stake side and stake end respectively afterwards, and the intensity of solidifying body reaches 3～15Mpa.
Rear mud jacking pre-stress hollow square pile of the present invention comprises pile body, madjack pipe and connector thereof and mud jacking body three parts.Its making comprises production and two stages of on-the-spot installation of factory's finished peg.The plant produced stage comprise installation, the reinforcing cage of the welding of end plate, skirtboard, various pipeline and connector making, installation, concretely build, the closure of template, the links such as concrete high speed centrifugation, high temperature, high pressure health; The site construction stage comprises the techniques such as the installation of mud jacking valve 14 or pile top 15, the connection that saves up and down stake pile body and mud jacking pipeline, pile sinking, mud jacking.By add mud jacking connector 2 on pre-stress hollow square pile end plate 1, set up madjack pipe 7 in pile body inside and add at square pile end plate place and connect short tube 4, connecting tee pipe 5, stake top connects short tube 6, connecting insertion 8, sealing ring 9, at the bottom of stake, add mud jacking valve 14 or band valve pile top 15, between the inner and upper and lower pile section of pre-stress hollow square pile, form top-down mud jacking pipeline, by with access stake top be connected short tube 6, stake top madjack pipe 11 is connected the mud jacking equipment 12 on ground, thereby form a set of complete mud jacking system, by be pressed into slurries 10 in pipeline, form the stake end body 16 that thes cement solidifies at stake end and stake side respectively, the stake side body 17 that thes cement solidifies.Stake end part forms like the cement paste dish of an expansion stake end body 16 that thes cement solidifies, and can obviously improve end resistance; Stake side pressure grouting can improve pile side friction by slurries 10 to the squeezing action of surrounding soil in square pile joint, slurries solidify rear and closely hoop armful of pile body simultaneously, the stake side that forms an irregular similar spheroid at the middle part of stake the cement solidifies body 17 and with an organic whole of pile body formation, thereby increase the sidepiece lifting surface area of pile body, improved the interaction of stake and the soil body.
As shown in Figure 1, rear mud jacking precast square pile overall structure and design sketch.Main body comprises three parts: foundation pile body, mud jacking system, mud jacking body.Wherein mud jacking system connects the pile top 15 etc. that pre-buried connection short tube 4, connecting tee pipe 5, stake top in short tube 6, stake top madjack pipe 11, precast square pile connect madjack pipe pipe connecting 8, sealing ring 9 and pile base grouting valve 14 between short tube 6, madjack pipe 7 and upper and lower pile section or carry mud jacking valve and forms by ground mud jacking equipment 12, stake top are above.
As shown in Figure 2, according to the end plate floor map of a kind of prestressed concrete square pile of a specific embodiment of the present invention.What the present invention proposed is actually a kind of prestressed concrete square pile through technological improvement, connect duct 2 by add mud jacking at end plate, mud jacking construction after setting up madjack pipe 7 carry out in preformed pile, madjack pipe 7 itself has certain resistance to tension like this, has improved the ability of square pile opposing horizontal force.
As shown in Figure 3; according to the floor map of a kind of prestressed concrete square pile end plate of another specific embodiment of the present invention; this prestressed concrete square pile is to meet under the requirement of underground aqueous corrosion area concrete protective layer thickness; a kind of situation after main reinforce position is adjusted; effectively like this prevent that pile body is subject to groundwater erosion, reached the effect of protection pile body.
As shown in Figure 4, according to the present invention, preformed pile is in the connection diagram of the process king-pile top of underground construction mud jacking pipe fitting, madjack pipe 11 is pushed up and is connected inner short tube 4, connecting tee pipe 5 and the madjack pipe 7 of being connected of 2 connection pile bodies of short tube 6 and stake headboard connector by stake, connection ground, top mud jacking system 12, thus realize being connected of ground installation and pile body mud jacking system.
As shown in Figure 5, according to the present invention, preformed pile saves the connection of inner mud jacking system in connection procedure up and down, will be saved up and down the inner mud jacking system convergence of stake and ensure the sealing performance of mud jacking by connecting insertion 8 and sealing ring 9.Intubate top adopts silk to connect mode and connects the madjack pipe of joint stake, connect the mud jacking pipeline of lower joint stake, thereby make whole mud jacking system can connect whole pile, the through stake end by inserted mode.Meanwhile, when the stake of joint stake instantly top connection short tube is selected tee piece 5, can realize a side pressure grouting.
As shown in Figure 6, a kind of steel according to a particular embodiment of the invention or concrete prefabricated pile top 15 and connection layout thereof, as shown in the figure, pile top end plate 13 is established mud jacking connector 2, the end, connects mud jacking valve 14, mud jacking valve 14 welds or imbeds in precast pile tip, and pile top mud jacking valve 14 was connected with being connected by connecting insertion 8 of pile body madjack pipe.
As shown in Figure 7, a kind of pile base grouting valve 14 connection diagrams of not establishing pile top according to a particular embodiment of the invention.Mud jacking valve 14 is by steel pipe manufacturing, and sidewall is equipped with mud jacking hole, and unidirectional device for opening is established in mud jacking hole, in order to avoid earth enters when piling.
As shown in Figure 8, according to the present invention, flexible in pile body of steel pipe madjack pipe 7 arranges 18, adopts the rubber car inner tube of a tyre 19 to seal, and two ends clamp with clip 20.Steel madjack pipe extends in the time of the main muscle stretch-draw of prestressing force simultaneously, and this figure is that solution steel pipe is to avoid being pulled ad hoc expansion bend 18 in the time of stretch-draw.Expansion bend 18 can be located at two ends or middle part, but to be located at stretching end as best.
Claims (3)
1. the manufacture method of mud jacking pre-stress hollow square pile after a kind, the profile of described hollow square pile is square prism, central authorities are the structure of hollow cylinder, stake two ends are provided with square endplate, skirtboard, in pile body, there is reinforcing cage, main muscle is prestressed steel bar, the two ends of described pile body are respectively equipped with the upper head plate that shape is identical (1) and bottom plate (1), on the face of upper head plate (1) and bottom plate (1), be arranged with at least respectively a pair of connector (2), the end of the stake up and down surrounding of described pile body is provided with the skirtboard (3) being connected with upper head plate and bottom plate; Described pile body end plate inner side be provided be communicated with connector (2) sealing of (1) four jiao of upper head plate be connected short tube (4) or tee piece (5), the horizontal tube of tee piece (5) is connected place to be left same bore circular hole and is tightly connected with skirtboard (3), the interior madjack pipe (7) of the connector (2) that bottom plate is four jiaos by pile body be connected short tube (4) and dock; Or the connector (2) of four jiaos of bottom plates is connected with the pipe up and down of tee piece (5) by the interior madjack pipe (7) of pile body; The method includes following steps:
1. by complete in the welding of end plate processing plant to the end plate up and down (1) of pre-stress hollow square pile and skirtboard (3), in welded end plate (1), connect short tube (4) or tee piece (5) simultaneously, then compile cage workshop by complete with above-mentioned assembly welding the reinforcing cage of the finishing end plate (1) with connection short tube (4) or tee piece (5) together with assembling steel reinforcement cage, after the assembling of reinforcing cage and end plate, on the spot by madjack pipe (7) be welded on the end plate of two ends be connected short tube (4) or tee piece (5) fits together;
In the time that madjack pipe (7) is plastic pipe, reserved stretching extension length; While being steel pipe as madjack pipe (7), should flexible valve (18) be set in madjack pipe (7) centre or two-end part, flexible valve (18) adopts the rubber car inner tube of a tyre (19) to carry out airtight, clip for two ends (20) clamping, flexible valve (18) length is 200～250mm;
2. madjack pipe (7) installs, all connectors (2) on employing plug or stopper sealing two ends end plate and the external opening of skirtboard and tee piece (5), inspection madjack pipe (7) is guaranteed to be connected firmly with the connecting portion that is connected short tube (4) or tee piece (5), while avoiding stretch-draw, throw off, and adopt adhesive tape airtight, in order to avoid cement paste enters in madjack pipe (7); Flexible valve (18) the overcoat caulking gum car inner tube of a tyre (19), clip for both sides (20) clamping, the caulking gum car inner tube of a tyre (19) should at least be reserved 200mm collapsing length;
3. after above-mentioned work completes, enter the formative stage of finished peg, enter mould, concreting, matched moulds, the main muscle stretch-draw of prestressing force and high speed centrifugation through reinforcing cage, through High-temperature Curing, form removal and pile after high-pressure steaming and cultivating again.
According to claim 1 after the manufacture method of mud jacking pre-stress hollow square pile, it is characterized in that: the connector (2) of described upper head plate (1) and bottom plate (1) is two or four, in the time establishing four holes, be arranged symmetrically in the Si Jiaochu on end plate face, in the time being two holes, diagonal angle setting.
According to claim 1 after the manufacture method of mud jacking pre-stress hollow square pile, it is characterized in that: described madjack pipe (7) is two or four, and madjack pipe (7) is plastic pipe or steel pipe.
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| CN201110450260.5A CN102518129B (en) | 2011-12-29 | 2011-12-29 | Post pressure-grouting pre-stressed hollow square pile and manufacturing method thereof |
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| CN201110450260.5A CN102518129B (en) | 2011-12-29 | 2011-12-29 | Post pressure-grouting pre-stressed hollow square pile and manufacturing method thereof |
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| CN102518129B true CN102518129B (en) | 2014-09-10 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103334426A (en) * | 2013-05-30 | 2013-10-02 | 上海大禺预制构件有限公司 | Anti-corrosion hollow square pile end head connecting device |
| CN105442594A (en) * | 2015-12-04 | 2016-03-30 | 荣盛建设工程有限公司 | Hole reaming mud-jacking construction technology for prestress hollow square pile with built-in mud-jacking pipe |
| CN106013134B (en) * | 2016-07-18 | 2020-03-17 | 浙江水利水电学院 | Diameter-expanding concrete pipe pile, diameter-expanding device and diameter-expanding method |
| CN113529739B (en) * | 2021-07-28 | 2023-07-28 | 王冰璇 | Coaxial expansion assembled support, shaftless rotary sprayer and corresponding construction method |
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| KR0136958B1 (en) * | 1994-10-28 | 1998-05-15 | 임성철 | Piles comprising both precast concrete portions and concrete portions cast in situ |
| JP2000129669A (en) * | 1998-10-22 | 2000-05-09 | Asahi Chem Ind Co Ltd | Connecting method of prefabricated pile |
| CN101936002A (en) * | 2010-08-16 | 2011-01-05 | 句容长江建材有限公司 | Prestressed concrete hollow square pile and production method thereof |
| CN102251521A (en) * | 2011-04-26 | 2011-11-23 | 东南大学 | Reinforced prestressed tubular pile and construction method thereof |
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- 2011-12-29 CN CN201110450260.5A patent/CN102518129B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR0136958B1 (en) * | 1994-10-28 | 1998-05-15 | 임성철 | Piles comprising both precast concrete portions and concrete portions cast in situ |
| JP2000129669A (en) * | 1998-10-22 | 2000-05-09 | Asahi Chem Ind Co Ltd | Connecting method of prefabricated pile |
| CN101936002A (en) * | 2010-08-16 | 2011-01-05 | 句容长江建材有限公司 | Prestressed concrete hollow square pile and production method thereof |
| CN102251521A (en) * | 2011-04-26 | 2011-11-23 | 东南大学 | Reinforced prestressed tubular pile and construction method thereof |
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