CN102757205A - Pretensioned prestressed high strength concrete and production method of pretensioned prestressed high strength concrete tubular pile - Google Patents
Pretensioned prestressed high strength concrete and production method of pretensioned prestressed high strength concrete tubular pile Download PDFInfo
- Publication number
- CN102757205A CN102757205A CN2012102790316A CN201210279031A CN102757205A CN 102757205 A CN102757205 A CN 102757205A CN 2012102790316 A CN2012102790316 A CN 2012102790316A CN 201210279031 A CN201210279031 A CN 201210279031A CN 102757205 A CN102757205 A CN 102757205A
- Authority
- CN
- China
- Prior art keywords
- concrete
- high strength
- strength concrete
- pile tube
- pretensioned prestressing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses pretensioned prestressed high strength concrete which contains cement, medium coarse sand, fine sand powders, broken stones, water and high efficiency water-reducing agents. A pretensioned prestressed high strength concrete tubular pile can be produced by means of the concrete, and a production method of the pretensioned prestressed high strength concrete tubular pile includes the steps of stirring, end plate installation, cage rib framework production and installation, prestress tension, centrifugal forming and steam curing. The produced phi 400*110mm tubular pile has high bending resistance performances and ultimate bending moment, the production schedule is fast, production costs are low, a centrifugal machine is not easy to abrade, and freight volumes of vehicles are increased.
Description
Technical field
The present invention relates to a kind of concrete and use this concrete and process a kind of as the working method of building foundation with pile tube.
Background technology
Prestressed concrete pipe pile can be divided into post stressed concrete pile tube and pretensioned prestressed concrete pipe pile.Pretensioned prestressed concrete pipe pile is the product of gazing in the successful civil construction field of domestic-developed; Has the supporting capacity height; Advantages such as the production cycle is short are widely used in the great foundation workss such as industry and covil construction, road, bridge, water conservancy, electric power, metallurgy of China's Coastal Areas.Press strength grade of concrete, the pretensioned prestressed concrete pipe pile that strength grade of concrete must not be lower than C80 (being that concrete cube ultimate compression strength is not less than 80Mpa) is called pretensioned prestressing strong concrete pipe piles.Moreover, constructed and need even also developed the pretensioned prestressing strong concrete pipe piles of concrete cube ultimate compression strength greater than 85Mpa.
The existing working method of pretensioned prestressing strong concrete pipe piles comprise concrete preparation, Framework Of Steel Reinforcement making, go into process steps such as mould, centrifugal forming and the demoulding, autoclave curing.Because these process steps are prior art, so repeat no more.Wherein, concrete preparation is the determinative of decision pretensioned prestressing strong concrete pipe piles supporting capacity.And the concrete preparation time guarantees that concrete workability is crucial.
As everyone knows, concrete workability is a comprehensive technical feature, and it comprises the performance of concrete flowability, glutinous gathering property, three aspects of water-retentivity.Both interknited mutual again contradiction between these three kinds of performances.Mainly show: concrete when mobile when increasing, concrete glutinous gathering property and water-retentivity will variation, and then reduce concrete intensity; When increasing concrete glutinous gathering property, concrete water-retentivity also can improve accordingly, but can reduce concrete flowability, thereby influences concrete Forming Quality.It is thus clear that the good condition of concrete workability must be based upon flowability, glutinous gathering property, this three aspects performance of water-retentivity and be issued on the unified basis in certain concrete working conditions.
According to noted earlier, developed the pretensioned prestressing strong concrete pipe piles of concrete cube ultimate compression strength at present greater than 85Mpa.This pile tube is compared general pretensioned prestressing strong concrete pipe piles and is had higher concrete crushing strength, thus during concrete batching in order to guarantee concrete glutinous gathering property and water-retentivity, require less to concrete flowability.Concrete flowability mainly shows through concrete slump value S.For the concrete cube ultimate compression strength that guarantees pile tube greater than 85Mpa, must concrete slump S be controlled in the scope of 1～3cm by existing technical requirements.Moreover,, concrete also to concrete sand coarse aggregate ratio (used sand and the shared weight percent of rubble medium sand) be controlled in 26～29% the scope, further to guarantee concrete intensity when preparing.
Summary of the invention
The technical problem that the present invention solved provides a kind of concrete cube ultimate compression strength that can either guarantee greater than 85Mpa, can improve the pretensioned prestressing strong concrete pipe piles working method that anti-bending strength and ultimate bending moment make the reduced of pile tube again.
The technical scheme that solves the problems of the technologies described above is: a kind of pretensioned prestressing strong concrete at first is provided; The preparation of raw material of every cubic meter of concrete is such as following: cement 340～400Kg; Medium coarse sand 670～730Kg, fine sand powder 120Kg, rubble 1220～1280Kg; Water 141～161Kg, high efficiency water reducing agent 9.6～11Kg.
Further, said weight proportion is: cement 340Kg, medium coarse sand 730Kg, fine sand powder 120Kg, rubble 1220Kg, water 141Kg, high efficiency water reducing agent 9.6Kg.
Said cement mark is PII52.5R.
Said high efficiency water reducing agent is the HXD-2R model.
Secondly, a kind of working method of pretensioned prestressing strong concrete pipe piles is provided, step is following:
(1) the contained various compositions of concrete is stirred the slump concrete of processing 2～4cm;
(2) behind the pile protection hoop of regular length 1258mm end plate is installed;
(3) make and install cage muscles and bones frame;
(4) concrete distributing and matched moulds;
(5) prestressed stretch-draw;
(6) centrifugal forming, when the pile tube external diameter was Φ 400mm, the middling speed frequency was under the situation of 33.5Hz, the whizzer motor speed is 670 rev/mins;
(7) elementary steam curing and high-pressure steaming and cultivating reach pile tube to put Zhang Qiangdu 50～60Mpa through steam-cured, make pile tube intensity reach C85～C95Mpa after putting a demoulding.
In the above-mentioned steps, fine sand powder loss on ignition 0.5%, silicon-dioxide 91.2%, density 2.64g/cm
3
Compared with prior art, innovative point of the present invention is:
1. the anti-bending strength of pile tube and ultimate bending moment significantly improve, and like Φ 400 * 110mm specification, the vertical ultimate bearing capacity of pile body reaches 5200KN.Under the situation of having dwindled internal diameter, increased wall thickness 15mm on the contrary, quite played the effect that increases the PC rod iron.
During according to ground local product reason mechanical index and bearing capacity parameter empirical relationship calculating vertical bearing capacity of single pile eigenwert, can calculate by the formula of Guangdong Province standard " Code for design of building " < DBJ15-31-2003 >, that is:
Ra＝Up∑qain·Li+qpaAp
In the formula: Ra is the vertical bearing capacity of single pile eigenwert, and Up is the tubular pile body outer perimeter, and qain is the thickness of pile tube I layer soil, and qpa is the end resistance eigenwert of pile tube, and Ap is the sharp horizontally-projected area of stake.
Above formula can recognize that the long more diameter of pile tube is bigger big more with the stake side-friction force, and then the factor of the bearing capacity characteristic of pile tube is a lot, such as stake side soil nature, and stake end soil nature, stake footpath, the wall thickness of opening stake, embedded depth, sequence of construction etc.
2. the production cost of pile tube reduces.
3. pile tube is convenient for production, quick, reduces a lot of unnecessary labor forces.
4. the working method of pile tube can reduce the wearing and tearing to machine effectively, and when centrifugal, 400 * 110mm presses Φ 400 * 95mm centrifuging process like middling speed, and the middling speed frequency is that centrifugal motor speed is 670 to change under 33.5 the situation.
5. effectively control or minimizing on the pile tube transportation cost, on same car, pile tube is adorned about 1/3rd rice number more.
6. the progress of pile tube production is fast, the phenomenon of avoiding the piling influence to produce.
Embodiment
Embodiment 1---produce PHC400AB * 110 pile tubes
Preparation 1m
3The quality of each raw material of concrete is tower board PII52.5R cement 340Kg, medium coarse sand 730Kg, fine sand powder 120Kg, rubble 1220Kg, water 141Kg, tower board HXD-2R high efficiency water reducing agent 9.6Kg.
Sand coarse aggregate ratio 37.4%, 5～25mm rubble crush index 9.5% of this embodiment, cement are tower board PII52.5R cement (3 days anti-folding 6.0Mpa, 3 days resistance to compression 32Mpa; 28 days anti-folding 9.0Mpa, 28 days resistance to compression 60Mpa), the fine sand powder accounts for binder total amount 26%, fine sand powder specific surface area 420m
2/ Kg, wc are 0.31.
The production craft step of this embodiment is following:
1. the metering of concrete raw material, stirring; According to the proportioning that designs with sand, stone, cement, water, fine sand powder, high efficiency water reducing agent etc. through accurate measurement, process the fresh concrete of the low slump (slump of concrete is a low slump less than 10cm) of 3cm with the concrete forced mixer.The design strength grade is not less than C80.The fresh concrete proportioning makes various materials through the time set and the rolling of stirrer, and it is even to reach concrete, make the concrete structure not stratified, do not emanate.The effect of the slump is to observe concrete workability, flowability, water-retentivity.
2. the pile protection hoop that the preceding fixedly tole about 1258mm is processed is installed in the making of end plate, end plate, can play the concrete effect of protection.End plate is meant the steel part at two ends in the tube pile structure, and it can play the effect at anchoring two ends effectively when stretch-draw, when construction piling, can connect the pile tube at two ends up and down, has very strong durable resistance ability.
3. cage muscles and bones frame is made and the muscles and bones frame is installed, in the finished product pile tube, have anti-bending strength effect, form by PC rod iron and wire rod.The cage muscles and bones frame that utilizes PC rod iron and wire rod to make can increase concrete sigma compactness ability and the anti-bending strength done effectively.
4. concrete distributing and matched moulds.The muscles and bones frame the inside that concrete is evenly distributed on fix through cloth (earlier, back two ends, intermediary order again), and through equidirectional both sides matched moulds (whenever earlier lock a screw at a distance from 2m, and then lock remaining screw, make not spillage of concrete joint close) simultaneously.
5. prestressed stretch-draw.Because of the pile tube made is the pretensioning pre-stress concrete, through the stretch-draw machine the good pile tube of matched moulds is carried out stretch-draw, reach pre-set prestress and get into next stage.
6. centrifugal forming.Pile tube is a centrifugal molding process, therefore through behind the prestressed stretch-draw, must pipe die hang carry out on the whizzer centrifugal.With first middling speed concrete is rationally distributed at a slow speed, middling speed is moulding and further fine and close, is at a high speed the effect that reaches densification according to regular hour and rotating speed.Like middling speed when centrifugal, the middling speed frequency is that centrifugal motor speed is 670 to change under 33.5 the situation.
7. elementary steam curing and high-pressure steaming and cultivating can directly be supplied the building site and used behind the high-pressure curing.It is reached put more than the Zhang Qiangdu 55Mpa, put a demoulding and get into steam press maintenance through steam-cured, according to the temperature that designs, pressure and the time chien shih pile tube intensity reach C85Mpa.
Embodiment 2---produce PHC400AB * 110 pile tubes
Preparation 1m
3The quality of each raw material of concrete is tower board PII52.5R cement 370Kg, medium coarse sand 700Kg, fine sand powder 120Kg, rubble 1250Kg, water 150Kg, tower board HXD-2R high efficiency water reducing agent 10.3Kg.
Sand coarse aggregate ratio 35.9%, 5～25mm rubble crush index 9.5% of this embodiment, cement are tower board PII52.5R cement (3 days anti-folding 6.0Mpa, 3 days resistance to compression 32Mpa; 28 days anti-folding 9.0Mpa, 28 days resistance to compression 60Mpa), the fine sand powder accounts for binder total amount 24.5%, fine sand powder specific surface area 420m
2/ Kg, wc are 0.31.
The production craft step of this embodiment is following:
1. the metering of concrete raw material, stirring; According to the proportioning that designs with sand, stone, cement, water, fine sand powder, high efficiency water reducing agent etc. through accurate measurement, process the fresh concrete of the low slump (slump of concrete is a low slump less than 10cm) of 2cm with the concrete forced mixer.The design strength grade is not less than C80.The fresh concrete proportioning makes various materials through the time set and the rolling of stirrer, and it is even to reach concrete, make the concrete structure not stratified, do not emanate.The effect of the slump is to observe concrete workability, flowability, water-retentivity.
2. the pile protection hoop that the preceding fixedly tole about 1258mm is processed is installed in the making of end plate, end plate, can play the concrete effect of protection.End plate is meant the steel part at two ends in the tube pile structure, and it can play the effect at anchoring two ends effectively when stretch-draw, when construction piling, can connect the pile tube at two ends up and down, has very strong durable resistance ability.
3. cage muscles and bones frame is made and the muscles and bones frame is installed, in the finished product pile tube, have anti-bending strength effect, form by PC rod iron and wire rod.The cage muscles and bones frame that utilizes PC rod iron and wire rod to make can increase concrete sigma compactness ability and the anti-bending strength done effectively.
4. concrete distributing and matched moulds.The muscles and bones frame the inside that concrete is evenly distributed on fix through cloth (earlier, back two ends, intermediary order again), and through equidirectional both sides matched moulds (whenever earlier lock a screw at a distance from 2m, and then lock remaining screw, make not spillage of concrete joint close) simultaneously.
5. prestressed stretch-draw.Because of the pile tube made is the pretensioning pre-stress concrete, through the stretch-draw machine the good pile tube of matched moulds is carried out stretch-draw, reach pre-set prestress and get into next stage.
6. centrifugal forming.Pile tube is a centrifugal molding process, therefore through behind the prestressed stretch-draw, must pipe die hang carry out on the whizzer centrifugal.With first middling speed concrete is rationally distributed at a slow speed, middling speed is moulding and further fine and close, is at a high speed the effect that reaches densification according to regular hour and rotating speed.Like middling speed when centrifugal, the middling speed frequency is that centrifugal motor speed is 670 to change under 33.5 the situation.
7. elementary steam curing and high-pressure steaming and cultivating can directly be supplied the building site and used behind the high-pressure curing.It is reached put more than the Zhang Qiangdu 55Mpa, put a demoulding and get into steam press maintenance through steam-cured, according to the temperature that designs, pressure and the time chien shih pile tube intensity reach C87Mpa.
Embodiment 3---produce PHC400AB * 110 pile tubes
Preparation 1m
3The quality of each raw material of concrete is tower board PII52.5R cement 400Kg, medium coarse sand 670Kg, fine sand powder 120Kg, rubble 1280Kg, water 161Kg, tower board HXD-2R high efficiency water reducing agent 11Kg.
Sand coarse aggregate ratio 34.4%, 5～25mm rubble crush index 9.5% of this embodiment, cement are tower board PII52.5R cement (3 days anti-folding 6.0Mpa, 3 days resistance to compression 32Mpa; 28 days anti-folding 9.0Mpa, 28 days resistance to compression 60Mpa), the fine sand powder accounts for binder total amount 23%, fine sand powder specific surface area 420m
2/ Kg, wc are 0.31.
The production craft step of this embodiment is following:
1. the metering of concrete raw material, stirring; According to the proportioning that designs with sand, stone, cement, water, fine sand powder, high efficiency water reducing agent etc. through accurate measurement, process the fresh concrete of the low slump (slump of concrete is a low slump less than 10cm) of 4cm with the concrete forced mixer.The design strength grade is not less than C80.The fresh concrete proportioning makes various materials through the time set and the rolling of stirrer, and it is even to reach concrete, make the concrete structure not stratified, do not emanate.The effect of the slump is to observe concrete workability, flowability, water-retentivity.
2. the pile protection hoop that the preceding fixedly tole about 1258mm is processed is installed in the making of end plate, end plate, can play the concrete effect of protection.End plate is meant the steel part at two ends in the tube pile structure, and it can play the effect at anchoring two ends effectively when stretch-draw, when construction piling, can connect the pile tube at two ends up and down, has very strong durable resistance ability.
3. cage muscles and bones frame is made and the muscles and bones frame is installed, in the finished product pile tube, have anti-bending strength effect, form by PC rod iron and wire rod.The cage muscles and bones frame that utilizes PC rod iron and wire rod to make can increase concrete sigma compactness ability and the anti-bending strength done effectively.
4. concrete distributing and matched moulds.The muscles and bones frame the inside that concrete is evenly distributed on fix through cloth (earlier, back two ends, intermediary order again), and through equidirectional both sides matched moulds (whenever earlier lock a screw at a distance from 2m, and then lock remaining screw, make not spillage of concrete joint close) simultaneously.
5. prestressed stretch-draw.Because of the pile tube made is the pretensioning pre-stress concrete, through the stretch-draw machine the good pile tube of matched moulds is carried out stretch-draw, reach pre-set prestress and get into next stage.
6. centrifugal forming.Pile tube is a centrifugal molding process, therefore through behind the prestressed stretch-draw, must pipe die hang carry out on the whizzer centrifugal.With first middling speed concrete is rationally distributed at a slow speed, middling speed is moulding and further fine and close, is at a high speed the effect that reaches densification according to regular hour and rotating speed.Like middling speed when centrifugal, the middling speed frequency is that centrifugal motor speed is 670 to change under 33.5 the situation.
7. elementary steam curing and high-pressure steaming and cultivating can directly be supplied the building site and used behind the high-pressure curing.It is reached put more than the Zhang Qiangdu 55Mpa, put a demoulding and get into steam press maintenance through steam-cured, according to the temperature that designs, pressure and the time chien shih pile tube intensity reach C85～C95Mpa.
Claims (6)
1. pretensioned prestressing strong concrete, the preparation of raw material that it is characterized in that every cubic meter of concrete are such as down: cement 340～400kg, medium coarse sand 670～730Kg; Fine sand powder 120Kg; Rubble 1200～1280Kg, water 141～161Kg, high efficiency water reducing agent 9.6～11Kg.
2. pretensioned prestressing strong concrete as claimed in claim 1 is characterized in that said weight proportion is: cement 340Kg, medium coarse sand 730Kg, fine sand powder 120Kg, rubble 1220Kg, water 141Kg, high efficiency water reducing agent 9.6Kg.
3. pretensioned prestressing strong concrete as claimed in claim 1 is characterized in that, said cement mark is PII52.5R.
4. pretensioned prestressing strong concrete as claimed in claim 1 is characterized in that, said high efficiency water reducing agent is the HXD-2R model.
5. the working method of pretensioned prestressing strong concrete pipe piles according to claim 1 is characterized in that step is following:
(1) the contained various compositions of concrete is stirred the slump concrete of processing 2～4cm;
(2) behind the pile protection hoop of regular length 1258mm end plate is installed;
(3) make and install cage muscles and bones frame;
(4) concrete distributing and matched moulds;
(5) prestressed stretch-draw;
(6) centrifugal forming, when the pile tube external diameter was Φ 400mm, the middling speed frequency was under the situation of 33.5Hz, the whizzer motor speed is 670 rev/mins;
(7) elementary steam curing and high-pressure steaming and cultivating reach pile tube to put Zhang Qiangdu 50～60Mpa through steam-cured, make pile tube intensity reach C85～C95Mpa after putting a demoulding.
6. pretensioned prestressing strong concrete as claimed in claim 1 is characterized in that, fine sand powder loss on ignition 0.5%, silicon-dioxide 91.2%, density 2.64g/cm
3
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102790316A CN102757205A (en) | 2012-08-07 | 2012-08-07 | Pretensioned prestressed high strength concrete and production method of pretensioned prestressed high strength concrete tubular pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102790316A CN102757205A (en) | 2012-08-07 | 2012-08-07 | Pretensioned prestressed high strength concrete and production method of pretensioned prestressed high strength concrete tubular pile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102757205A true CN102757205A (en) | 2012-10-31 |
Family
ID=47051890
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012102790316A Pending CN102757205A (en) | 2012-08-07 | 2012-08-07 | Pretensioned prestressed high strength concrete and production method of pretensioned prestressed high strength concrete tubular pile |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102757205A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103276727A (en) * | 2013-06-04 | 2013-09-04 | 吴建生 | Prestressed high-strength concrete tubular pile, end plate, concrete and production method of tubular pile |
| CN103481363A (en) * | 2013-09-07 | 2014-01-01 | 安徽富强混凝土有限公司管桩分公司 | Production process of concrete pipe pile |
| CN103950101A (en) * | 2014-04-21 | 2014-07-30 | 南通华柱水泥制品有限公司 | Manufacturing method for high-strength concrete pile |
| CN104230255A (en) * | 2014-08-22 | 2014-12-24 | 南通华柱水泥制品有限公司 | Process for producing high-strength tubular pile with weather-resistant property |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85108550A (en) * | 1985-11-30 | 1987-06-03 | 清华大学 | Prestressed concrete foundation pile |
| CN101570421A (en) * | 2009-06-22 | 2009-11-04 | 中建八局第四建设有限公司 | Self-compacting concrete for prestressed girders with ultra-long span |
| CN201598635U (en) * | 2009-12-16 | 2010-10-06 | 江苏建华管桩有限公司 | Concrete tubular pile with high stress |
-
2012
- 2012-08-07 CN CN2012102790316A patent/CN102757205A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85108550A (en) * | 1985-11-30 | 1987-06-03 | 清华大学 | Prestressed concrete foundation pile |
| CN101570421A (en) * | 2009-06-22 | 2009-11-04 | 中建八局第四建设有限公司 | Self-compacting concrete for prestressed girders with ultra-long span |
| CN201598635U (en) * | 2009-12-16 | 2010-10-06 | 江苏建华管桩有限公司 | Concrete tubular pile with high stress |
Non-Patent Citations (1)
| Title |
|---|
| 王汉立: "高效减水剂与管桩混凝土配合比设计", 《湖北第二师范学院学报》, no. 8, 31 December 2011 (2011-12-31), pages 96 - 99 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103276727A (en) * | 2013-06-04 | 2013-09-04 | 吴建生 | Prestressed high-strength concrete tubular pile, end plate, concrete and production method of tubular pile |
| CN103481363A (en) * | 2013-09-07 | 2014-01-01 | 安徽富强混凝土有限公司管桩分公司 | Production process of concrete pipe pile |
| CN103950101A (en) * | 2014-04-21 | 2014-07-30 | 南通华柱水泥制品有限公司 | Manufacturing method for high-strength concrete pile |
| CN104230255A (en) * | 2014-08-22 | 2014-12-24 | 南通华柱水泥制品有限公司 | Process for producing high-strength tubular pile with weather-resistant property |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102603233A (en) | Preparation method of high-durability prestressed centrifugal concrete pile | |
| CN102276214B (en) | High-durability and high-bearing-capacity concrete pipe pile | |
| CN102267180A (en) | Concrete pile production method free from steaming and pressing and pouring remaining slurry | |
| CN102198696B (en) | Method for preparing high-strength high-performance concrete tubular pile | |
| CN103541289A (en) | Colored high-titanium heavy slag permeable pavement brick and production method thereof | |
| CN101863079A (en) | Method for manufacturing prestressed concrete tubular pile | |
| CN102153321B (en) | High-titanium slag well cover and production method thereof | |
| CN103434020A (en) | Production method of non-residual slurry non-autoclaved prestressed concrete pipe pile | |
| CN102276213A (en) | High-durability and high-bearing-capacity concrete segment | |
| CN110642564B (en) | Crude polypropylene-basalt hybrid fiber prefabricated hard fiber concrete, jacking pipe and manufacturing method | |
| CN102211353A (en) | Process for manufacturing centrifugal concrete pile | |
| CN101439953A (en) | Agglomerated rock pavior brick with pervious function and preparation thereof | |
| CN202090337U (en) | Centrifugal concrete pile | |
| CN105016670A (en) | Concrete annular pole and preparation method thereof | |
| CN102757205A (en) | Pretensioned prestressed high strength concrete and production method of pretensioned prestressed high strength concrete tubular pile | |
| CN107337398A (en) | A kind of box hat immersed tube lower shrinkage self-compacting concrete, its preparation method and application | |
| CN107117905A (en) | Full aggregate concrete grass-planting brick of waste ceramic and preparation method thereof | |
| CN101745984A (en) | Production method of pretensioned prestressing strong concrete pipe piles | |
| CN111485716A (en) | Application of waste concrete large aggregate in concrete structure construction | |
| CN103274648A (en) | Granite stone powder doped high-strength concrete tubular pile and production method thereof | |
| CN102229484A (en) | Method for manufacturing tubular pile by adopting pump concrete | |
| CN104827561B (en) | A kind of steam pressure PHC pile tube preparation methods without remaining slurry | |
| CN104418547A (en) | Concrete prefabricated pile and production method thereof | |
| CN103304190B (en) | A kind of roof waterproof layer cast high impervious cracking resistance protective layer and manufacture craft thereof | |
| CN113860809A (en) | Cement-setting material, artificial mudstone and method for producing the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20121031 |