CN104416675A - Manufacturing process of pre-tensioned prestressed centrifugal concrete square pile - Google Patents
Manufacturing process of pre-tensioned prestressed centrifugal concrete square pile Download PDFInfo
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- CN104416675A CN104416675A CN201310392518.XA CN201310392518A CN104416675A CN 104416675 A CN104416675 A CN 104416675A CN 201310392518 A CN201310392518 A CN 201310392518A CN 104416675 A CN104416675 A CN 104416675A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
- B28B23/04—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed
- B28B23/10—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed the shaping being effected by centrifugal or rotational moulding
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- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
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Abstract
The invention discloses a manufacturing process of a pre-tensioned prestressed centrifugal concrete square pile. The manufacturing process includes the steps of a, measuring and stirring concrete materials; b, manufacturing end plates of the centrifugal square pile; c, manufacturing a frame; d, mounting the reinforced frame; e, distributing concrete; f, closing a mold; g, performing prestress tensioning; h, performing centrifuging; I, performing primary steam curing; j, performing stripping; and k, directly lifting stripped centrifugal square piles, having concrete design strength level reaching C60, to a product yard for stacking, and delivering out of the factory after natural curing is complete and delivery strength is reached; subjecting the stripped centrifugal square piles, having the concrete design strength level reaching C80 and above, to high-temperature steam curing in a high-pressure autoclave, and directly delivering the piles subjected to the high-pressure curing. The manufacturing process has the advantages that the manufacturing process is simple, manufacturing time is short, fewer materials are used, energy consumption is low, and the manufactured centrifugal pile has high strength and good quality.
Description
Technical field
The present invention relates to a kind of manufacture craft of pretensioned prestressing centrifugal concrete square pile.
Background technology
In building foundation engineering, precast concrete pile mainly contains the prefabricated concrete pipe pile of circular cross-section and the precast concrete square pile in square or rectangular cross section with regard to pile body cross sectional shape.Since the nineties in last century, along with the standardization of prefabricated concrete pipe pile and the development of production and construction technology, foundation engineering is approved widely to pile tube product, in Practical Project, pile tube product has its significant superiority, but not enough in the following aspects performance: 1) pile tube is external circular structure, not easily help in transport to prick, fix; 2) because tubular pile body exists certain ovality, adopt when embracing pressure construction and easily occur that pile body embraces broken accident; 3) pile tube is after soft soil foundation construction, when excavation of foundation pit, easily occurs that stake position tilts; 4) cushion cap of pipe pile foundation is large compared with square pile, and basic cost is higher.
Except harbor work basis adopts the pre-stressed concrete hollow square stake of pre-tensioning system technique, (inner chamber mainly adopts preset inflated rubber mode to precast concrete square pile, have square or rectangular two kinds of section forms) outward, most of foundation engineering mainly adopt handwork non-prestressed, vibro-moulding process is in the majority, concrete adopts natural curing, and structure mostly is solid square sectional.Mainly there is lower column defects in this precast square pile: 1) production efficiency is low, and the production cycle is long; 2) product quality is unstable, more containing pore in hardened concrete structure cross section; 3) concrete strength is low, and bearing capacity of pile fails to give full play to; 4) Concrete in Natural curing time is long, and production floor space is large.
Summary of the invention
Based on above-mentioned technical problem, the invention provides a kind of manufacture craft of pretensioned prestressing centrifugal concrete square pile.
The technology used in the present invention solution is:
A manufacture craft for pretensioned prestressing centrifugal concrete square pile, comprises the following steps:
The metering of a concrete raw material, stirring: according to match ratio by sand, stone, cement, water, additive, admixture accurate measurement, make fresh concrete with concrete forced mixer;
B offcenter squared pile end plate makes: the shape fabricating squarely of offcenter squared pile end plate, and arranges the counterbore of the main muscle of prestressing force in end plate corner;
C carcasing: select the main muscle of prestressing force and spiral bar, adopts automatic welding machine screwing steel bars skeleton;
D installs framework of steel reinforcement: the framework of steel reinforcement made, square endplate are positioned in the steel mold of offcenter squared pile, and connects with deformed bar anchor plate, stretch board, tension rod;
E concrete distributing: by the consumption requirement of every root offcenter squared pile, fresh concrete is evenly filled up second punching block along mould;
F matched moulds: first punching block of offcenter squared pile is winched to above second punching block, and with bolt, upper and lower two halves punching block is fixed;
G prestressed stretch-draw: adopt the stretching machine of jack type to carry out integral tension to the offcenter squared pile framework of steel reinforcement after matched moulds, with big nut, tension rod is fixed in steel mold after being stretched to 70% of reinforced steel bar strength;
H is centrifugal: winch to above centrifuge by the band mould offcenter squared pile after above-mentioned stretch-draw anchor, and accelerate step by step by the centrifugal system of initial velocity, middling speed, high speed, high speed, centrifugation time is 20 ~ 30min;
I primary steam maintenance: winch in atmospheric steam curing pond by the band mould offcenter squared pile after centrifugal forming, quietly stops 1 ~ 2h, is slowly warming up to 105 ~ 110 DEG C, maintenance 2 ~ 3h under normal pressure;
J demoulding: the band mould offcenter squared pile after primary steam maintenance is winched on stripping station position, sheds stretch-draw bolt and die bolt with pneumatic impact wrench, to pile body Shi Hanzhang, then hang away upper mold section, stir female die, shed prestressing force and widen screw rod; Female die, anchor plate, tension rod in cleaning, and brushing releasing agent;
K is the offcenter squared pile of C60 for concrete design strength grade, by direct for the offcenter squared pile after demoulding handling to finished product stockyard Ma Dui, and natural curing, reaching intensity of dispatching from the factory can dispatch from the factory; Be the offcenter squared pile of more than C80 for concrete design strength grade, offcenter squared pile after the demoulding need be entered autoclave again and carry out high temperature steam curing, temperature is 160 ~ 170 DEG C, and saturated vapour pressure is 1.5Mpa, curing time 5 ~ 6h, the pile tube after high-pressure curing can directly dispatch from the factory for stake.
Preferably, in step a, described fresh concrete is the fresh concrete of the low slump of 3 ~ 5cm.
Preferably, in step b, c, the main muscle of described prestressing force adopts the steel bar for prestressed concrete of underrelaxation type.
Preferably, in step c, described spiral bar adopts the low-carbon (LC) cold drawn wire of 4 ~ 6mm.
Preferably, in steps d, before square endplate is installed, surrounding needs throat thickness to be the barrette cuff that the sheet metal of 1.5 ~ 2mm is made into.
Advantageous Effects of the present invention is:
1) offcenter squared pile manufacture craft Concrete in Natural curing time of the present invention is short, and production efficiency is high, and floor space is little, and power consumption is few, and obtained offcenter squared pile intensity is high, Functionality, quality and appealing design;
2) offcenter squared pile that the present invention obtains is square-outside and round-inside shape structure, easily helps to prick, fix in transport;
3) because offcenter squared pile structural section is square, outer surface is smooth, adopts when embracing pressure construction and seldom occurs that pile body embraces broken accident;
4) offcenter squared pile is after soft soil foundation construction, when excavation of foundation pit, occurs that the situation that stake position tilts is significantly smaller than pile tube;
5) cushion cap on offcenter squared pile basis is little compared with pile tube, can reduce foundation engineering amount and engineering cost etc.
Accompanying drawing explanation
Fig. 1 is the process chart of one embodiment of the present invention.
Detailed description of the invention
As shown in Figure 1, a kind of manufacture craft of pretensioned prestressing centrifugal concrete square pile, comprises the following steps:
The metering of a concrete raw material, stirring: according to match ratio by sand, stone, cement, water, additive, admixture accurate measurement, make the fresh concrete of the low slump of 3 ~ 5cm with concrete forced mixer; Designing requirement strength grade of concrete is not less than C60.
B offcenter squared pile end plate makes: make basically identical with pile end board, but the shape fabricating squarely of offcenter squared pile end plate, and the counterbore of the main muscle of prestressing force is set in end plate corner.Before square endplate is installed, surrounding needs throat thickness to be the barrette cuff that the sheet metal of 1.5 ~ 2mm is made into.
C carcasing: select the main muscle of prestressing force and spiral bar, adopts automatic welding machine screwing steel bars skeleton, and the main muscle of prestressing force adopts the prestressed concrete steel stick of underrelaxation type, through accurate fixed-length, cut-out, pier nose; Spiral bar adopts the low-carbon (LC) cold drawn wire of 4 ~ 6mm.
D installs framework of steel reinforcement: the framework of steel reinforcement made, square endplate (welding cuff) are positioned in the steel mold of offcenter squared pile, and connect with deformed bar anchor plate, stretch board, tension rod.
E concrete distributing: by the consumption requirement of every root offcenter squared pile, fresh concrete is evenly filled up second punching block along mould, many as far as possible some concrete of cloth in stretch-draw one end.
F matched moulds: first punching block of offcenter squared pile is winched to above second punching block, and with bolt, upper and lower two halves punching block is fixed, to guarantee that mould does not loosen and concrete not running pulp in high speed centrifugation operation process.
G prestressed stretch-draw: adopt the stretching machine of jack type to carry out integral tension to the offcenter squared pile framework of steel reinforcement after matched moulds, with big nut, tension rod is fixed in steel mold after being stretched to 70% of reinforced steel bar strength.
H is centrifugal: winch to above centrifuge by the band mould offcenter squared pile after above-mentioned stretch-draw anchor, and accelerate step by step by the centrifugal system of initial velocity, middling speed, high speed, high speed, centrifugation time is 20 ~ 30min.By centrifugal closely knit moulding process, make fresh concrete evenly closely knit along the mould surrounding of offcenter squared pile, meanwhile, square pile forms a round cavity.After centrifugal end, stretching end is raised, topple over the useless pulp-water produced in centrifugal process.
I primary steam maintenance: winch in atmospheric steam curing pond (hole) by the band mould offcenter squared pile after centrifugal forming, quietly stops 1 ~ 2h, and be slowly warming up to 105 ~ 110 DEG C, maintenance 2 ~ 3h under normal pressure, makes concrete strength reach more than 40MPa.
J demoulding: the band mould offcenter squared pile after primary steam maintenance is winched on stripping station position, sheds stretch-draw bolt and die bolt with pneumatic impact wrench, to pile body Shi Hanzhang, then hang away upper mold section, stir female die, shed prestressing force and widen screw rod.Female die, anchor plate, tension rod in cleaning, and brushing releasing agent.
K is by direct for the offcenter squared pile after demoulding handling to finished product stockyard Ma Dui, and natural curing, reaching intensity of dispatching from the factory can dispatch from the factory.Be the offcenter squared pile of more than C80 for concrete design strength grade, offcenter squared pile after the demoulding need be entered autoclave again and carry out high temperature steam curing, temperature is 160 ~ 170 DEG C, and saturated vapour pressure is 1.5Mpa, curing time 5 ~ 6h, the pile tube after high-pressure curing can directly dispatch from the factory for stake.
In above-mentioned embodiment: cement adopt strength grade must not lower than 42.5 portland cement or Portland cement.Fine aggregate should adopt hard medium coarse sand, and modulus of fineness is preferably 2.5 ~ 3.2, and clay content should be less than 1%; Elected when using artificial sand, modulus of fineness should not be greater than 3.8.Coarse aggregate should adopt rubble or crushed gravel, and its maximum particle diameter is not more than 25mm, and must not exceed 3/4 of distance of reinforcing bar.Rubble has to pass through to be sieved and washed, and clay content must not be greater than 0.5%, and the rock mass compression strength of rubble should be greater than 1.5 times of joined concrete strength.The objectionable impurities that mixing concrete water must not normally condense containing affecting cement and harden and oil.Water reducer quality should meet the regulation of GB80765 concrete admixture, and water-reducing rate is greater than 15%.Admixture can select silica flour, flyash, ground slag, silicon ash etc., must carry out verification experimental verification before using to its relevant Performance and quality.The main muscle of prestressing force: adopt diameter to be greater than the L-type low relaxed prestress the reinforcement of concrete rod iron of 7.1mm, ductility rank is 35, and elongation after fracture is not less than 7%, and tensile strength is greater than 1420MPa, and yield strength is greater than 1275MPa.Spiral bar: the low-carbon (LC) cold drawn wire adopting diameter 4 ~ 6mm.The carbon structural steels of the material selection Q235 of end plate, steel hoop.
The relative difference of prestressing force main muscle cutting length must not be greater than L/5000, and (L is that stake is long, in mm), heading intensity must not lower than 90% of this material standard intensity, and the loss of strength of the main muscle of prestressing force and spiral bar pad must not be greater than 5% of this material standard intensity.The main muscle of prestressing force evenly configures along offcenter squared pile cross-sectional distribution, and minimum steel ratio is not less than 0.4%, and must not be less than 4.The diameter of spiral bar should be determined according to offcenter squared pile specification, and the length of side is less than 450mm and following, and spiral bar diameter should not be less than 4mm; The length of side is 500 ~ 600mm, and spiral bar diameter should not be less than 5mm; Apart from stake two ends in 1000 ~ 1500mm length range, pitch is 40 ~ 60mm, and the maximum pitch of framework of steel reinforcement is no more than 120mm.The concrete cover of the main muscle of prestressing force of the centrifugal pile tube of prestress high intensity concrete, prestress concrete offcenter squared pile must not be less than 25mm, and the concrete cover of the main muscle of prestressing force of prestressed concrete centrifugal thin-walled square pile must not be less than 20mm.
Prestress concrete offcenter squared pile, prestressed concrete centrifugal thin-walled square pile strength grade of concrete must not lower than C60, and the centrifugal pile tube strength grade of concrete of prestress high intensity concrete must not lower than C80.Fresh concrete slump general control is at 3 ~ 7cm, and when offcenter squared pile is produced, demoulding strength must not lower than 40MPa.Offcenter squared pile adopts end plate welding.
Claims (5)
1. a manufacture craft for pretensioned prestressing centrifugal concrete square pile, is characterized in that, comprises the following steps:
The metering of a concrete raw material, stirring: according to match ratio by sand, stone, cement, water, additive, admixture accurate measurement, make fresh concrete with concrete forced mixer;
B offcenter squared pile end plate makes: the shape fabricating squarely of offcenter squared pile end plate, and arranges the counterbore of the main muscle of prestressing force in end plate corner;
C carcasing: select the main muscle of prestressing force and spiral bar, adopts automatic welding machine screwing steel bars skeleton;
D installs framework of steel reinforcement: the framework of steel reinforcement made, square endplate are positioned in the steel mold of offcenter squared pile, and connects with deformed bar anchor plate, stretch board, tension rod;
E concrete distributing: by the consumption requirement of every root offcenter squared pile, fresh concrete is evenly filled up second punching block along mould;
F matched moulds: first punching block of offcenter squared pile is winched to above second punching block, and with bolt, upper and lower two halves punching block is fixed;
G prestressed stretch-draw: adopt the stretching machine of jack type to carry out integral tension to the offcenter squared pile framework of steel reinforcement after matched moulds, with big nut, tension rod is fixed in steel mold after being stretched to 70% of reinforced steel bar strength;
H is centrifugal: winch to above centrifuge by the band mould offcenter squared pile after above-mentioned stretch-draw anchor, and accelerate step by step by the centrifugal system of initial velocity, middling speed, high speed, high speed, centrifugation time is 20 ~ 30min;
I primary steam maintenance: winch in atmospheric steam curing pond by the band mould offcenter squared pile after centrifugal forming, quietly stops 1 ~ 2h, is slowly warming up to 105 ~ 110 DEG C, maintenance 2 ~ 3h under normal pressure;
J demoulding: the band mould offcenter squared pile after primary steam maintenance is winched on stripping station position, sheds stretch-draw bolt and die bolt with pneumatic impact wrench, to pile body Shi Hanzhang, then hang away upper mold section, stir female die, shed prestressing force and widen screw rod; Female die, anchor plate, tension rod in cleaning, and brushing releasing agent;
K is the offcenter squared pile of C60 for concrete design strength grade, by direct for the offcenter squared pile after demoulding handling to finished product stockyard Ma Dui, and natural curing, reaching intensity of dispatching from the factory can dispatch from the factory; Be the offcenter squared pile of more than C80 for concrete design strength grade, offcenter squared pile after the demoulding need be entered autoclave again and carry out high temperature steam curing, temperature is 160 ~ 170 DEG C, and saturated vapour pressure is 1.5Mpa, curing time 5 ~ 6h, the pile tube after high-pressure curing can directly dispatch from the factory for stake.
2. the manufacture craft of a kind of pretensioned prestressing centrifugal concrete square pile according to claim 1, is characterized in that, in step a, described fresh concrete is the fresh concrete of the low slump of 3 ~ 5cm.
3. the manufacture craft of a kind of pretensioned prestressing centrifugal concrete square pile according to claim 1, is characterized in that, in step b, c, the main muscle of described prestressing force adopts the steel bar for prestressed concrete of underrelaxation type.
4. the manufacture craft of a kind of pretensioned prestressing centrifugal concrete square pile according to claim 1, is characterized in that, in step c, described spiral bar adopts the low-carbon (LC) cold drawn wire of 4 ~ 6mm.
5. the manufacture craft of a kind of pretensioned prestressing centrifugal concrete square pile according to claims 1, is characterized in that, in steps d, before square endplate is installed, surrounding needs throat thickness to be the barrette cuff that the sheet metal of 1.5 ~ 2mm is made into.
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| CN105544531A (en) * | 2016-01-25 | 2016-05-04 | 李文明 | Prestressed high-strength concrete hollow support pile and manufacturing method thereof |
| CN106272953A (en) * | 2016-08-16 | 2017-01-04 | 重庆市晟庄建材有限责任公司 | A kind of processing method of prestressed concrete reinforcing steel stake |
| CN106626045A (en) * | 2016-10-12 | 2017-05-10 | 常德定海管桩有限公司 | Prestressed concrete pole as well as mold and manufacturing method thereof |
| CN106631152A (en) * | 2016-12-28 | 2017-05-10 | 中铁五局集团第五工程有限责任公司 | Method for making high-performance concrete for high-speed railway ballastless track through manufactured sand |
| CN109487782A (en) * | 2018-12-29 | 2019-03-19 | 威海中恒管桩有限公司 | A kind of concrete tubular pile Crane Rail support column and manufacture craft |
| CN109676782A (en) * | 2019-01-11 | 2019-04-26 | 福建省大地管桩有限公司 | The manufacturing process of concrete tubular pile with net metal skeleton |
| CN109795026A (en) * | 2019-01-11 | 2019-05-24 | 福建省大地管桩有限公司 | The manufacturing process of electrochemically resistant corrosion tubular pole |
| CN110154223A (en) * | 2018-02-12 | 2019-08-23 | 周兆弟 | A kind of production technology of prefabricated pile |
| CN110281380A (en) * | 2019-07-04 | 2019-09-27 | 福建省大地管桩有限公司 | The manufacturing process of orientation condensation tubular pole |
| WO2020072015A1 (en) | 2018-10-04 | 2020-04-09 | Sentez İnşaat Yazilim Sanayi̇ Ve Ti̇caret Li̇mi̇ted Şi̇rketi̇ | Prestressed reinforced concrete pipe pile and a production method thereof |
| CN111138131A (en) * | 2020-01-06 | 2020-05-12 | 慈溪市建筑构件有限公司 | Preparation method of pretensioned prestressed concrete pipe pile |
| CN111844408A (en) * | 2020-07-28 | 2020-10-30 | 安徽凯越电力杆塔有限公司 | Method for producing electric pole by using automatic concrete pumping and feeding system |
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| CN113246294A (en) * | 2021-06-02 | 2021-08-13 | 江苏苏誉建筑构件有限责任公司 | Production line method and equipment for prefabricated reinforced concrete square pile |
| CN113334565A (en) * | 2021-05-08 | 2021-09-03 | 广东三和管桩股份有限公司 | Preparation method of diamond pile |
| CN113524426A (en) * | 2021-07-12 | 2021-10-22 | 嘉兴南方混凝土制品有限公司 | Manufacturing process of corrosion-resistant prestressed pipe pile |
| CN113664980A (en) * | 2021-08-26 | 2021-11-19 | 南京钜力智能制造技术研究院有限公司 | Manufacturing method of prestressed concrete pressure pipe and prestressed concrete pressure pipe |
| CN114274308A (en) * | 2021-12-30 | 2022-04-05 | 宿迁华美新材料有限公司 | Preparation method of high-strength high-toughness pretensioned prestressed concrete square pile |
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| CN105544531A (en) * | 2016-01-25 | 2016-05-04 | 李文明 | Prestressed high-strength concrete hollow support pile and manufacturing method thereof |
| CN106272953A (en) * | 2016-08-16 | 2017-01-04 | 重庆市晟庄建材有限责任公司 | A kind of processing method of prestressed concrete reinforcing steel stake |
| CN106626045A (en) * | 2016-10-12 | 2017-05-10 | 常德定海管桩有限公司 | Prestressed concrete pole as well as mold and manufacturing method thereof |
| CN106631152A (en) * | 2016-12-28 | 2017-05-10 | 中铁五局集团第五工程有限责任公司 | Method for making high-performance concrete for high-speed railway ballastless track through manufactured sand |
| CN110480821A (en) * | 2018-02-12 | 2019-11-22 | 周兆弟 | Concrete precast pile automatic production line workshop and production system |
| CN110154223A (en) * | 2018-02-12 | 2019-08-23 | 周兆弟 | A kind of production technology of prefabricated pile |
| EP3861173A4 (en) * | 2018-10-04 | 2022-06-29 | Sentez Insaat Denizcilik Sanayi ve Ticaret Limited Sirketi | Prestressed reinforced concrete pipe pile and a production method thereof |
| WO2020072015A1 (en) | 2018-10-04 | 2020-04-09 | Sentez İnşaat Yazilim Sanayi̇ Ve Ti̇caret Li̇mi̇ted Şi̇rketi̇ | Prestressed reinforced concrete pipe pile and a production method thereof |
| CN109487782A (en) * | 2018-12-29 | 2019-03-19 | 威海中恒管桩有限公司 | A kind of concrete tubular pile Crane Rail support column and manufacture craft |
| CN109676782A (en) * | 2019-01-11 | 2019-04-26 | 福建省大地管桩有限公司 | The manufacturing process of concrete tubular pile with net metal skeleton |
| CN109795026A (en) * | 2019-01-11 | 2019-05-24 | 福建省大地管桩有限公司 | The manufacturing process of electrochemically resistant corrosion tubular pole |
| CN110281380A (en) * | 2019-07-04 | 2019-09-27 | 福建省大地管桩有限公司 | The manufacturing process of orientation condensation tubular pole |
| CN111138131A (en) * | 2020-01-06 | 2020-05-12 | 慈溪市建筑构件有限公司 | Preparation method of pretensioned prestressed concrete pipe pile |
| CN111844408A (en) * | 2020-07-28 | 2020-10-30 | 安徽凯越电力杆塔有限公司 | Method for producing electric pole by using automatic concrete pumping and feeding system |
| CN112248220A (en) * | 2020-10-16 | 2021-01-22 | 盐城市双强管桩有限公司 | Method for manufacturing steel mould of pre-tensioned prestressed concrete prefabricated screw pile |
| CN112248220B (en) * | 2020-10-16 | 2022-01-18 | 盐城市双强管桩有限公司 | Method for manufacturing steel mould of pre-tensioned prestressed concrete prefabricated screw pile |
| CN113334565A (en) * | 2021-05-08 | 2021-09-03 | 广东三和管桩股份有限公司 | Preparation method of diamond pile |
| CN113246294A (en) * | 2021-06-02 | 2021-08-13 | 江苏苏誉建筑构件有限责任公司 | Production line method and equipment for prefabricated reinforced concrete square pile |
| CN113524426A (en) * | 2021-07-12 | 2021-10-22 | 嘉兴南方混凝土制品有限公司 | Manufacturing process of corrosion-resistant prestressed pipe pile |
| CN113664980A (en) * | 2021-08-26 | 2021-11-19 | 南京钜力智能制造技术研究院有限公司 | Manufacturing method of prestressed concrete pressure pipe and prestressed concrete pressure pipe |
| CN114274308A (en) * | 2021-12-30 | 2022-04-05 | 宿迁华美新材料有限公司 | Preparation method of high-strength high-toughness pretensioned prestressed concrete square pile |
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