CN104420465A - Prestressed concrete pile and production method thereof - Google Patents

Prestressed concrete pile and production method thereof Download PDF

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Publication number
CN104420465A
CN104420465A CN201310374195.1A CN201310374195A CN104420465A CN 104420465 A CN104420465 A CN 104420465A CN 201310374195 A CN201310374195 A CN 201310374195A CN 104420465 A CN104420465 A CN 104420465A
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China
Prior art keywords
concrete
concrete pile
cement
consumption
prestressed concrete
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CN201310374195.1A
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Chinese (zh)
Inventor
王传波
王风民
田斌
邢正涛
邓国威
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QINGDAO XINGHE BUILDING MATERIAL CO Ltd
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QINGDAO XINGHE BUILDING MATERIAL CO Ltd
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Priority to CN201310374195.1A priority Critical patent/CN104420465A/en
Publication of CN104420465A publication Critical patent/CN104420465A/en
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2250/00—Production methods
    • E02D2250/0007—Production methods using a mold
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2250/00—Production methods
    • E02D2250/0023—Cast, i.e. in situ or in a mold or other formwork
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2250/00—Production methods
    • E02D2250/0046—Production methods using prestressing techniques
    • 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
    • E02D5/58—Prestressed concrete piles

Abstract

The invention discloses a pretressed concrete pile which is casted by pumped high-strength concrete. The pumped high-strength concrete comprises the following ingredients: cement, fine aggregate, coarse aggregate, water, mineral active material, and additive; the additive comprises water reducing agent and retarding admixture; the volume weight of the concrete is 2420 kilograms per cubic meter to 2550 kilograms per cubic meter; in each cubic meter of the concrete, the dosage of the cement is 440 kilograms to 490 kilograms, the dosage of the fine aggregate is 530 kilograms to 560 kilograms, the dosage of the coarse aggregate is 1210 kilograms to 1230 kilograms, the dosage of water is 140 kilograms to 160 kilograms, the mixing amount of the mineral active material is 16% to 18% of the dosage of the cement, the mixing amount of the water reducing agent is 1.8% to 2% of the dosage of the cement, and the mixing amount of the retarding admixture is 0.15% of the dosage of the cement. The invention further discloses a production method of the prestressed concrete pile. The prestressed concrete pile has high strength and good durability.

Description

A kind of prestressed concrete pile and production method thereof
Technical field
The invention belongs to building materials production and processing field, relate to a kind of prestressed concrete pile specifically, and a kind of production method of prestressed concrete pile.
Background technology
With it, prestressed concrete pile has that bearing capacity of single pile is high, good endurance, can factorial praluction, pile quality is reliable, durable resistance good, penetration power is strong, bending resistance tensile property is good, construction fast, work efficiency is high, job site is civilized, supervision examination is convenient, the common stake of the cost ratio of good economy performance, case unit capacity is low, settling amount is little, be widely used in industrial construction, civilian construction and the Foundation Design such as bridge, harbour without the advantage such as sandstone and cement contaminants.The range of application of prestressed concrete pile is day by day wide, but harsh geological environment, the engineering of western part as higher in corrosive medium concentration in ocean, harbour, severe cold area, underground water, coastal and hinterland, proposes more and more higher requirement to the intensity of prestressed concrete pile and durability.At present, the prestressed concrete pile of domestic production is difficult to meet the requirement to prestressed concrete pile high frost resistance, high sulfate resisting erosion and high chloride-penetration resistance etc. in architectural design, practice of construction.
As can be seen here, prior art awaits further improving.
Summary of the invention
The present invention is the weak point avoiding above-mentioned prior art to exist, and provides the production method of a kind of prestressed concrete pile and a kind of prestressed concrete pile.
The technical solution adopted in the present invention is:
A kind of prestressed concrete pile, built by pump high strength concrete and form, described pump high strength concrete comprises following component: cement, fines, coarse aggregate, water, mineral active material and Admixture, and described Admixture comprises water reducing agent and retarding agent, and described concrete unit weight is 2420 ㎏/m 3~ 2550 ㎏/m 3the consumption of cement described in every cubic metre of described concrete is 440 ㎏ ~ 490 ㎏, the consumption of fines is 530 ㎏ ~ 560 ㎏, the consumption of coarse aggregate is 1210 ㎏ ~ 1230 ㎏, the consumption of water is 140 ㎏ ~ 160 ㎏, the volume of described mineral active material is 16% ~ 18% of described cement consumption, the volume of described water reducing agent is 1.8% ~ 2% of described cement consumption, and the volume of described retarding agent is 0.15% of described cement consumption.
Described mineral active material is flyash or zeolite powder.
Described fines is medium sand or coarse sand.
Described coarse aggregate is rubble or cobble.
The fineness modulus of described fines is 2.3 ~ 3.4.
SiO in described fines 2content>=90%.
The particle diameter of described coarse aggregate is 8 ㎜ ~ 25 ㎜.
Described water reducing agent is polycarboxylate high performance dehydragent.
A production method for prestressed concrete pile as above, comprises the steps:
(1) described fines and coarse aggregate are put in forced mixer, stir until evenly, then, put in forced mixer by 10% ~ 30% of the weight of described water, after stir about 30s, drop into cement, continue stir about 30s, afterwards, drop into remaining water, continue stir about 30s, then drop into polycarboxylate high performance dehydragent, mineral active material and retarding agent and carry out stirring until discharging evenly again, must not more than 30min from the concrete-agitating complete time to discharging;
(2) concrete be stirred in advance in step (1) is evenly loaded by pump machine in the mould being provided with the good reinforcement cage skeleton of stretch-draw, before concrete pumping, first adopted by pump line 1:2 cement mortar to lubricate, preparation 0.5 ~ 1.0m 3mortar pour hopper into and carry out pumping, pour the concrete be stirred in advance in step (1) when mortar is complete by force feed into and directly proceed to normal pumping;
(3) concrete mould will be housed and carry out centrifugal forming operation, until concrete pile is shaping;
(4) after centrifugal end, the mould that concrete and steel reinforcement framework cage are housed is carried out atmospheric steam curing, described atmospheric steam curing comprises and quietly stops stage, temperature rise period, constant temperature stage and temperature-fall period, the described quiet stage general control that stops is at 1 ~ 2h, programming rate general control is at 20 ~ 25 DEG C/h, thermostat temperature general control, at 70 DEG C ~ 90 DEG C, makes concrete reach regulation demoulding strength, and cooling need slowly be carried out;
(5) after atmospheric steam curing terminates, carry out the demoulding, demoulding strength must not lower than 40MPa; Carry out autoclave curing after the demoulding, the medium of autoclave curing should adopt saturated steam, and during autoclave curing constant voltage, Steam pressure control is at 0.9 ~ 1.0MPa, and thermostat temperature is 160 DEG C ~ 200 DEG C, and curing time is 7 ~ 8h;
(6) autoclave curing terminates, and can obtain finished product, can dispatch from the factory and transport building site injection to after concrete pile cooling.
Owing to have employed technique scheme, the beneficial effect acquired by the present invention is:
Be mixed with a certain amount of retarding agent in the production method of 1, a kind of prestressed concrete pile of the present invention, improve concrete workability, postponed the concrete initial setting time; In addition, a certain amount of mineral active material is mixed with in this production method, add concrete compactness, improve the interface performance between aggregate and cement, improve concrete intensity and durability, meanwhile, retarding agent and adding of mineral active material also pumpability of concrete is substantially improved.
2, the present invention employs polycarboxylate high performance dehydragent in pumping of concrete, and the intensity of concrete pile is greatly improved; Adopt Concrete Pumping Technology to produce concrete pile, greatly improve production efficiency, saved cost of production, reduce the labour intensity of workman.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in further detail, but the present invention is not limited to these embodiments.
Embodiment 1
A kind of prestressed concrete pile, built by pump high strength concrete and form, described pump high strength concrete comprises following component: cement, fines, coarse aggregate, water, mineral active material and Admixture, and described Admixture comprises water reducing agent and retarding agent, and described concrete unit weight is 2450 ㎏/m 3, described in every cubic metre of described concrete, the consumption of cement is 450 ㎏, described fines be medium sand and its consumption be 530 ㎏, the fineness modulus of medium sand is 2.3, SiO in medium sand 2content be 90%, described coarse aggregate is rubble, the consumption of rubble is 1210 ㎏, the particle diameter of rubble is 8mm, the consumption of water is 140 ㎏, described mineral active material is flyash and its volume is 16% of described cement consumption, described water reducing agent is polycarboxylate high performance dehydragent and its volume is 1.8% of described cement consumption, and the volume of described retarding agent is 0.15% of described cement consumption.
A production method for prestressed concrete pile as above, comprises the steps:
(1) described medium sand and rubble are put in forced mixer, stir until evenly, then, put in forced mixer by 10% of the weight of described water, after stir about 30s, drop into cement, continue stir about 30s, afterwards, drop into the water of remaining 90%, continue stir about 30s, then drop into polycarboxylate high performance dehydragent, flyash and retarding agent and carry out stirring until discharging evenly again, must not more than 30min from the concrete-agitating complete time to discharging;
(2) concrete be stirred in advance in step (1) is evenly loaded by pump machine in the mould being provided with the good reinforcement cage skeleton of stretch-draw, before concrete pumping, first adopted by pump line 1:2 cement mortar to lubricate, preparation 0.5m 3mortar pour hopper into and carry out pumping, pour the concrete be stirred in advance in step (1) when mortar is complete by force feed into and directly proceed to normal pumping;
(3) concrete mould will be housed and carry out centrifugal forming operation, until concrete pile is shaping; Described centrifugal forming operation comprises low-speed stage, low-medium speed stage, middling speed stage and high speed stage; Described low-speed stage is the upset of green concrete compound by reinforcement cage skeleton mould, makes it recover good mobility; The described low-medium speed stage is the cloth stage, makes green concrete material be uniformly distributed in template inwall; The described middling speed stage is transition stage, makes it to continue uniform distribution and overcome centrifugal force to uprush, and reduces inside and outside layering, improves density and the impermeability of concrete pile; Described high speed stage is the closely knit stage;
(4) after centrifugal end, the mould that concrete and steel reinforcement framework cage are housed is carried out atmospheric steam curing, described atmospheric steam curing comprises and quietly stops stage, temperature rise period, constant temperature stage and temperature-fall period, the described quiet stage general control that stops is at 1h, programming rate general control is at 20 DEG C/h, thermostat temperature general control, at 70 DEG C, makes concrete reach regulation demoulding strength, and cooling need slowly be carried out;
(5) after atmospheric steam curing terminates, carry out the demoulding, demoulding strength must not lower than 40MPa; Carry out autoclave curing after the demoulding, the medium of autoclave curing should adopt saturated steam, and during autoclave curing constant voltage, Steam pressure control is at 0.9 ± 0.05MPa, and thermostat temperature is 160 DEG C, and curing time is 7h;
(6) autoclave curing terminates, and can obtain finished product, can dispatch from the factory and transport building site injection to after concrete pile cooling.
Embodiment 2
A kind of prestressed concrete pile, built by pump high strength concrete and form, described pump high strength concrete comprises following component: cement, fines, coarse aggregate, water, mineral active material and Admixture, and described Admixture comprises water reducing agent and retarding agent, and described concrete unit weight is 2470 ㎏/m 3, described in every cubic metre of described concrete, the consumption of cement is 460 ㎏, described fines be medium sand and its consumption be 540 ㎏, the fineness modulus of medium sand is 2.4, SiO in medium sand 2content be 95%, described coarse aggregate is rubble, the consumption of rubble is 1210 ㎏, the particle diameter of rubble is 15mm, the consumption of water is 145 ㎏, described mineral active material is flyash and its volume is 16% of described cement consumption, described water reducing agent is polycarboxylate high performance dehydragent and its volume is 1.8% of described cement consumption, and the volume of described retarding agent is 0.15% of described cement consumption.
A production method for prestressed concrete pile as above, comprises the steps:
(1) described medium sand and rubble are put in forced mixer, stir until evenly, then, put in forced mixer by 15% of the weight of described water, after stir about 30s, drop into cement, continue stir about 30s, afterwards, drop into the water of remaining 85%, continue stir about 30s, then drop into polycarboxylate high performance dehydragent, flyash and retarding agent and carry out stirring until discharging evenly again, must not more than 30min from the concrete-agitating complete time to discharging;
(2) concrete be stirred in advance in step (1) is evenly loaded by pump machine in the mould being provided with the good reinforcement cage skeleton of stretch-draw, before concrete pumping, first adopted by pump line 1:2 cement mortar to lubricate, preparation 0.6m 3mortar pour hopper into and carry out pumping, pour the concrete be stirred in advance in step (1) when mortar is complete by force feed into and directly proceed to normal pumping;
(3) concrete mould will be housed and carry out centrifugal forming operation, until concrete pile is shaping; Described centrifugal forming operation comprises low-speed stage, low-medium speed stage, middling speed stage and high speed stage; Described low-speed stage is the upset of green concrete compound by reinforcement cage skeleton mould, makes it recover good mobility; The described low-medium speed stage is the cloth stage, makes green concrete material be uniformly distributed in template inwall; The described middling speed stage is transition stage, makes it to continue uniform distribution and overcome centrifugal force to uprush, and reduces inside and outside layering, improves density and the impermeability of concrete pile; Described high speed stage is the closely knit stage;
(4) after centrifugal end, the mould that concrete and steel reinforcement framework cage are housed is carried out atmospheric steam curing, described atmospheric steam curing comprises and quietly stops stage, temperature rise period, constant temperature stage and temperature-fall period, the described quiet stage general control that stops is at 1h, programming rate general control is at 22 DEG C/h, thermostat temperature general control, at 75 DEG C, makes concrete reach regulation demoulding strength, and cooling need slowly be carried out;
(5) after atmospheric steam curing terminates, carry out the demoulding, demoulding strength must not lower than 40MPa; Carry out autoclave curing after the demoulding, the medium of autoclave curing should adopt saturated steam, and during autoclave curing constant voltage, Steam pressure control is at 0.95 ± 0.05MPa, and thermostat temperature is 170 DEG C, and curing time is 7h;
(6) autoclave curing terminates, and can obtain finished product, can dispatch from the factory and transport building site injection to after concrete pile cooling.
Embodiment 3
A kind of prestressed concrete pile, built by pump high strength concrete and form, described pump high strength concrete comprises following component: cement, fines, coarse aggregate, water, mineral active material and Admixture, and described Admixture comprises water reducing agent and retarding agent, and described concrete unit weight is 2480 ㎏/m 3, described in every cubic metre of described concrete, the consumption of cement is 470 ㎏, described fines be coarse sand and its consumption be 550 ㎏, the fineness modulus of coarse sand is 2.8, SiO in coarse sand 2content be 92%, described coarse aggregate is cobble, the consumption of cobble is 1220 ㎏, the particle diameter of cobble is 10mm, the consumption of water is 150 ㎏, described mineral active material is zeolite powder and its volume is 17% of described cement consumption, described water reducing agent is polycarboxylate high performance dehydragent and its volume is 1.9% of described cement consumption, and the volume of described retarding agent is 0.15% of described cement consumption.
A production method for prestressed concrete pile as above, comprises the steps:
(1) described coarse sand and cobble are put in forced mixer, stir until evenly, then, put in forced mixer by 20% of the weight of described water, after stir about 30s, drop into cement, continue stir about 30s, afterwards, drop into the water of remaining 80%, continue stir about 30s, then drop into polycarboxylate high performance dehydragent, zeolite powder and retarding agent and carry out stirring until discharging evenly again, must not more than 30min from the concrete-agitating complete time to discharging;
(2) concrete be stirred in advance in step (1) is evenly loaded by pump machine in the mould being provided with the good reinforcement cage skeleton of stretch-draw, before concrete pumping, first adopted by pump line 1:2 cement mortar to lubricate, preparation 0.7m 3mortar pour hopper into and carry out pumping, pour the concrete be stirred in advance in step (1) when mortar is complete by force feed into and directly proceed to normal pumping;
(3) concrete mould will be housed and carry out centrifugal forming operation, until concrete pile is shaping; Described centrifugal forming operation comprises low-speed stage, low-medium speed stage, middling speed stage and high speed stage; Described low-speed stage is the upset of green concrete compound by reinforcement cage skeleton mould, makes it recover good mobility; The described low-medium speed stage is the cloth stage, makes green concrete material be uniformly distributed in template inwall; The described middling speed stage is transition stage, makes it to continue uniform distribution and overcome centrifugal force to uprush, and reduces inside and outside layering, improves density and the impermeability of concrete pile; Described high speed stage is the closely knit stage;
(4) after centrifugal end, the mould that concrete and steel reinforcement framework cage are housed is carried out atmospheric steam curing, described atmospheric steam curing comprises and quietly stops stage, temperature rise period, constant temperature stage and temperature-fall period, the described quiet stage general control that stops is at 1.5h, programming rate general control is at 20 DEG C/h, thermostat temperature general control, at 80 DEG C, makes concrete reach regulation demoulding strength, and cooling need slowly be carried out;
(5) after atmospheric steam curing terminates, carry out the demoulding, demoulding strength must not lower than 40MPa; Carry out autoclave curing after the demoulding, the medium of autoclave curing should adopt saturated steam, and during autoclave curing constant voltage, Steam pressure control is at 0.9 ± 0.05MPa, and thermostat temperature is 180 DEG C, and curing time is 8h;
(6) autoclave curing terminates, and can obtain finished product, can dispatch from the factory and transport building site injection to after concrete pile cooling.
Embodiment 4
A kind of prestressed concrete pile, built by pump high strength concrete and form, described pump high strength concrete comprises following component: cement, fines, coarse aggregate, water, mineral active material and Admixture, and described Admixture comprises water reducing agent and retarding agent, and described concrete unit weight is 2500 ㎏/m 3, described in every cubic metre of described concrete, the consumption of cement is 480 ㎏, described fines be coarse sand and its consumption be 530 ㎏, the fineness modulus of coarse sand is 3, SiO in coarse sand 2content be 90%, described coarse aggregate is cobble, the consumption of cobble is 1210 ㎏, the particle diameter of cobble is 20mm, the consumption of water is 145 ㎏, described mineral active material is zeolite powder and its volume is 16% of described cement consumption, described water reducing agent is polycarboxylate high performance dehydragent and its volume is 1.8% of described cement consumption, and the volume of described retarding agent is 0.15% of described cement consumption.
A production method for prestressed concrete pile as above, comprises the steps:
(1) described coarse sand and cobble are put in forced mixer, stir until evenly, then, put in forced mixer by 15% of the weight of described water, after stir about 30s, drop into cement, continue stir about 30s, afterwards, drop into the water of remaining 85%, continue stir about 30s, then drop into polycarboxylate high performance dehydragent, zeolite powder and retarding agent and carry out stirring until discharging evenly again, must not more than 30min from the concrete-agitating complete time to discharging;
(2) concrete be stirred in advance in step (1) is evenly loaded by pump machine in the mould being provided with the good reinforcement cage skeleton of stretch-draw, before concrete pumping, first adopted by pump line 1:2 cement mortar to lubricate, preparation 0.8m 3mortar pour hopper into and carry out pumping, pour the concrete be stirred in advance in step (1) when mortar is complete by force feed into and directly proceed to normal pumping;
(3) concrete mould will be housed and carry out centrifugal forming operation, until concrete pile is shaping; Described centrifugal forming operation comprises low-speed stage, low-medium speed stage, middling speed stage and high speed stage; Described low-speed stage is the upset of green concrete compound by reinforcement cage skeleton mould, makes it recover good mobility; The described low-medium speed stage is the cloth stage, makes green concrete material be uniformly distributed in template inwall; The described middling speed stage is transition stage, makes it to continue uniform distribution and overcome centrifugal force to uprush, and reduces inside and outside layering, improves density and the impermeability of concrete pile; Described high speed stage is the closely knit stage;
(4) after centrifugal end, the mould that concrete and steel reinforcement framework cage are housed is carried out atmospheric steam curing, described atmospheric steam curing comprises and quietly stops stage, temperature rise period, constant temperature stage and temperature-fall period, the described quiet stage general control that stops is at 1h, programming rate general control is at 23 DEG C/h, thermostat temperature general control, at 75 DEG C, makes concrete reach regulation demoulding strength, and cooling need slowly be carried out;
(5) after atmospheric steam curing terminates, carry out the demoulding, demoulding strength must not lower than 40MPa; Carry out autoclave curing after the demoulding, the medium of autoclave curing should adopt saturated steam, and during autoclave curing constant voltage, Steam pressure control is at 0.95 ± 0.05MPa, and thermostat temperature is 190 DEG C, and curing time is 7h;
(6) autoclave curing terminates, and can obtain finished product, can dispatch from the factory and transport building site injection to after concrete pile cooling.
Embodiment 5
A kind of prestressed concrete pile, built by pump high strength concrete and form, described pump high strength concrete comprises following component: cement, fines, coarse aggregate, water, mineral active material and Admixture, and described Admixture comprises water reducing agent and retarding agent, and described concrete unit weight is 2550 ㎏/m 3, described in every cubic metre of described concrete, the consumption of cement is 490 ㎏, described fines be medium sand and its consumption be 560 ㎏, the fineness modulus of medium sand is 3.4, SiO in medium sand 2content be 95%, described coarse aggregate is cobble, the consumption of cobble is 1230 ㎏, the particle diameter of cobble is 25mm, the consumption of water is 160 ㎏, described mineral active material is flyash and its volume is 18% of described cement consumption, described water reducing agent is polycarboxylate high performance dehydragent and its volume is 2% of described cement consumption, and the volume of described retarding agent is 0.15% of described cement consumption.
A production method for prestressed concrete pile as above, comprises the steps:
(1) described medium sand and cobble are put in forced mixer, stir until evenly, then, put in forced mixer by 30% of the weight of described water, after stir about 30s, drop into cement, continue stir about 30s, afterwards, drop into the water of remaining 70%, continue stir about 30s, then drop into polycarboxylate high performance dehydragent, flyash and retarding agent and carry out stirring until discharging evenly again, must not more than 30min from the concrete-agitating complete time to discharging;
(2) concrete be stirred in advance in step (1) is evenly loaded by pump machine in the mould being provided with the good reinforcement cage skeleton of stretch-draw, before concrete pumping, first adopted by pump line 1:2 cement mortar to lubricate, preparation 1.0m 3mortar pour hopper into and carry out pumping, pour the concrete be stirred in advance in step (1) when mortar is complete by force feed into and directly proceed to normal pumping;
(3) concrete mould will be housed and carry out centrifugal forming operation, until concrete pile is shaping; Described centrifugal forming operation comprises low-speed stage, low-medium speed stage, middling speed stage and high speed stage; Described low-speed stage is the upset of green concrete compound by reinforcement cage skeleton mould, makes it recover good mobility; The described low-medium speed stage is the cloth stage, makes green concrete material be uniformly distributed in template inwall; The described middling speed stage is transition stage, makes it to continue uniform distribution and overcome centrifugal force to uprush, and reduces inside and outside layering, improves density and the impermeability of concrete pile; Described high speed stage is the closely knit stage;
(4) after centrifugal end, the mould that concrete and steel reinforcement framework cage are housed is carried out atmospheric steam curing, described atmospheric steam curing comprises and quietly stops stage, temperature rise period, constant temperature stage and temperature-fall period, the described quiet stage general control that stops is at 2h, programming rate general control is at 25 DEG C/h, thermostat temperature general control, at 90 DEG C, makes concrete reach regulation demoulding strength, and cooling need slowly be carried out;
(5) after atmospheric steam curing terminates, carry out the demoulding, demoulding strength must not lower than 40MPa; Carry out autoclave curing after the demoulding, the medium of autoclave curing should adopt saturated steam, and during autoclave curing constant voltage, Steam pressure control is at 0.95 ± 0.05MPa, and thermostat temperature is 200 DEG C, and curing time is 8h;
(6) autoclave curing terminates, and can obtain finished product, can dispatch from the factory and transport building site injection to after concrete pile cooling.
The compressive strength of the obtained prestressed concrete pile of embodiment 1,2,3,4,5 and endurance quality index are detected,
The results are shown in Table 1:
The performance indications table of table 1 concrete pile
The prestressed concrete pile that can be found in the present invention by table 1 is more better than the prestressed concrete pile produced with ordinary concrete in intensity, endurance quality index.
In addition, carried out anti-bending strength detection to the prestressed concrete pile of the present invention of various model, testing result finds that cracking moment and ultimate bending moment all meet the mechanical property requirements of the concrete pile of defined in standard GB/T 13476-2009.
Need to further illustrate, specific embodiment described herein is only to spiritual example explanation of the present invention.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present invention or surmount the scope that appended claims defines.

Claims (9)

1. a prestressed concrete pile, built by pump high strength concrete and form, it is characterized in that: described pump high strength concrete comprises following component: cement, fines, coarse aggregate, water, mineral active material and Admixture, described Admixture comprises water reducing agent and retarding agent, and described concrete unit weight is 2420 ㎏/m 3~ 2550 ㎏/m 3the consumption of cement described in every cubic metre of described concrete is 440 ㎏ ~ 490 ㎏, the consumption of fines is 530 ㎏ ~ 560 ㎏, the consumption of coarse aggregate is 1210 ㎏ ~ 1230 ㎏, the volume of described mineral active material is 16% ~ 18% of described cement consumption, the volume of described water reducing agent is 1.8% ~ 2% of described cement consumption, and the volume of described retarding agent is 0.15% of described cement consumption.
2. a kind of prestressed concrete pile according to claim 1, is characterized in that: described mineral active material is flyash or zeolite powder.
3. a kind of prestressed concrete pile according to claim 1, is characterized in that: described fines is medium sand or coarse sand.
4. a kind of prestressed concrete pile according to claim 1, is characterized in that: described coarse aggregate is rubble or cobble.
5. a kind of prestressed concrete pile according to claim 3, is characterized in that: the fineness modulus of described fines is 2.3 ~ 3.4.
6. a kind of prestressed concrete pile according to claim 5, is characterized in that: content >=90% of SiO2 in described fines.
7. a kind of prestressed concrete pile according to claim 4, is characterized in that: the particle diameter of described coarse aggregate is 8 ㎜ ~ 25 ㎜.
8. a kind of prestressed concrete pile according to claim 1, is characterized in that: described water reducing agent is polycarboxylate high performance dehydragent.
9. a production method for the prestressed concrete pile as described in any one of claim 1 to 8 claim, is characterized in that: comprise the steps:
(1) described fines and coarse aggregate are put in forced mixer, stir until evenly, then, put in forced mixer by 10% ~ 30% of the weight of described water, after stir about 30s, drop into cement, continue stir about 30s, afterwards, drop into remaining water, continue stir about 30s, then drop into polycarboxylate high performance dehydragent, mineral active material and retarding agent and carry out stirring until discharging evenly again, must not more than 30min from the concrete-agitating complete time to discharging;
(2) concrete be stirred in advance in step (1) is evenly loaded by pump machine in the mould being provided with the good reinforcement cage skeleton of stretch-draw, 1:2 cement mortar is first adopted by pump line to lubricate before concrete pumping, the mortar of preparation 0.5 ~ 1.0m3 is poured hopper into and is carried out pumping, pours the concrete be stirred in advance in step (1) into directly proceed to normal pumping when mortar is complete by force feed;
(3) concrete mould will be housed and carry out centrifugal forming operation, until concrete pile is shaping;
(4) after centrifugal end, the mould that concrete and steel reinforcement framework cage are housed is carried out atmospheric steam curing, described atmospheric steam curing comprises and quietly stops stage, temperature rise period, constant temperature stage and temperature-fall period, the described quiet stage general control that stops is at 1 ~ 2h, programming rate general control is at 20 ~ 25 DEG C/h, thermostat temperature general control, at 70 DEG C ~ 90 DEG C, makes concrete reach regulation demoulding strength, and cooling need slowly be carried out;
(5) after atmospheric steam curing terminates, carry out the demoulding, demoulding strength must not lower than 40MPa; Carry out autoclave curing after the demoulding, the medium of autoclave curing should adopt saturated steam, and during autoclave curing constant voltage, Steam pressure control is at 0.9 ~ 1.0MPa, and thermostat temperature is 160 DEG C ~ 200 DEG C, and curing time is 7 ~ 8h;
(6) autoclave curing terminates, and can obtain finished product, can dispatch from the factory and transport building site injection to after concrete pile cooling.
CN201310374195.1A 2013-08-26 2013-08-26 Prestressed concrete pile and production method thereof Pending CN104420465A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104827562A (en) * 2015-04-30 2015-08-12 华南理工大学 Preparation method of autoclaving PHC (prestressed high strength concrete) pipe pile with reduction of usage amount of cementing material
CN104827564A (en) * 2015-04-30 2015-08-12 华南理工大学 Preparation method of PC (prestressed concrete) pipe pile with reduction of usage amount of cementing material
CN106082818A (en) * 2016-06-15 2016-11-09 江苏燕宁建设工程有限公司 Concrete and making, construction method
CN106630782A (en) * 2015-11-02 2017-05-10 上海城建建设实业(集团)有限公司 SP prestressed hollow slab
CN114804781A (en) * 2022-05-25 2022-07-29 惠州市三环构件有限公司 Durable PHC tubular pile concrete and PHC tubular pile

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104827562A (en) * 2015-04-30 2015-08-12 华南理工大学 Preparation method of autoclaving PHC (prestressed high strength concrete) pipe pile with reduction of usage amount of cementing material
CN104827564A (en) * 2015-04-30 2015-08-12 华南理工大学 Preparation method of PC (prestressed concrete) pipe pile with reduction of usage amount of cementing material
CN104827564B (en) * 2015-04-30 2017-10-20 华南理工大学 It is a kind of to reduce the PC pile tube preparation methods of gel material content
CN106630782A (en) * 2015-11-02 2017-05-10 上海城建建设实业(集团)有限公司 SP prestressed hollow slab
CN106082818A (en) * 2016-06-15 2016-11-09 江苏燕宁建设工程有限公司 Concrete and making, construction method
CN114804781A (en) * 2022-05-25 2022-07-29 惠州市三环构件有限公司 Durable PHC tubular pile concrete and PHC tubular pile
CN114804781B (en) * 2022-05-25 2023-02-03 惠州市三环构件有限公司 Durable PHC tubular pile concrete and PHC tubular pile

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