CN100336648C - Prestressed concrete track beam continuing steam curing process - Google Patents
Prestressed concrete track beam continuing steam curing process Download PDFInfo
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- CN100336648C CN100336648C CNB031355935A CN03135593A CN100336648C CN 100336648 C CN100336648 C CN 100336648C CN B031355935 A CNB031355935 A CN B031355935A CN 03135593 A CN03135593 A CN 03135593A CN 100336648 C CN100336648 C CN 100336648C
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Abstract
The present invention discloses a durable steam curing technology for prestressed concrete track girders. A trolley enters a mould room provided with steaming and curing equipment for squaring the trolley, adjusting a side mould, pouring concrete, squaring, napping, keeping moisture in a static stop mode, curing by steam in the mould in a temperature rise mode and curing by the steam in the mould at constant temperature. The invention is characterized in that demoulding is carried out in the mould room under the state of constant temperature of 45 to 55 DEG C; the trolley is used to transport a girder body after demoulding into a heat preservation room provided with a steaming apparatus at the temperature of 40 to 50 DEG C through a passage at constant temperature, and the trolley is under the state of constant steam curing at the temperature of 40 to 50 DEG C; the trolley is under the state of gradual cooling steam curing at the temperature of smaller than 5 DEG C per hour; when the temperature difference of the surface temperature of the girder body and the surface temperature of the outdoor environment is smaller than 15 DEG C, a prefabricated component is moved out of the heat preservation room for natural curing. The present invention can enhance the turning frequency of the mould, quicken production progress and guarantee the quality of the PC track girder.
Description
(1) technical field
The invention belongs to precast concrete engineering field, particularly a kind of movably prestressed concrete track girder uses moist closet continuity steam curing process.
(2) background technology
At present, movably prestressed concrete track girder steam curing process technology is widely used at home, and this steam curing process must be with special particular manufacturing craft.Because the manufacturing cost height of particular manufacturing craft, and it is longer to produce the time that a product takies mould, has formed the movably high present situation of prestressed concrete track girder steam curing production cost.By country's " pre-stress concrete practical construction technology ", " construction of concrete Structural Engineering and acceptance specification " (GB50204-92), " concrete quality control standard " (GB50164-92), " railway bridges and culverts job specfication " pertinent regulations (TBJ203-96), steam curing of concrete intensity reaches 50% of design strength, and concrete surface and circumstance of temperature difference are less than the demoulding of 15 ℃ of ability.Steam curing of concrete intensity reaches 50% of design strength needs about 10 hours, and concrete is through the influence of steam curing and self heat of hydration, and steam-cured rear surface temperature reaches about 55 ℃, continues constant temperature 6～8 hours again.This moment the demoulding carry out natural curing, concrete prefabricated element can because of with the excessive formation temperature contraction fissure of circumstance of temperature difference, cause structural destruction.Thereby only hold over mould and lower the temperature steam-cured gradually, this stage needed 8～10 hours the temperature difference of surface temperature of concrete and environment temperature could be controlled in 15 ℃, take mould for a long time, seriously restricted the turnover of mould and the production of prestressed concrete track girder.Producing prestressed concrete track girder with Japan is example, and its two cover particular manufacturing craft and production line only can be produced a Pin beam every day.Therefore, how to accelerate the turnover of mould, can guarantee product quality again, become the key of prestressed concrete track girder steam curing process technology.
(3) summary of the invention
Purpose of the present invention provides a kind of prestressed concrete track girder continuity steam curing process.It can accelerate the turnover frequency of mould chamber, can make again to avoid the beam body because of excessive temperature differentials formation temperature contraction fissure, enhances productivity
For reaching above-mentioned purpose, the present invention enters the mould chamber that is provided with steaming and cultivating equipment with chassis, and to carry out chassis more flat, adjust side form, concreting, receive flat, plucking, quiet stopping preserved moisture, intensification steam curing in the mould, constant temperature steam curing in the mould, it is characterized in that: 45～55 ℃ of temperature constant state bottom knockouts in the mould chamber, be transported to temperature at 40～50 ℃ the moist closet that is provided with steaming and cultivating equipment with the beam body of chassis after by passage constant temperature with the demoulding, 40～50 ℃ of continuities of moist closet constant temperature steam curing 4 hours, lower the temperature steam-cured gradually with＜5 ℃/hour then, when treating beam surface temperature and the outdoor environment temperature temperature difference＜15 ℃, prefabricated component is shifted out moist closet carry out natural curing.
The present invention to the concreting prestressed concrete track girder (hereinafter to be referred as: the PC track girder) steam-cured 4 hours of 45 ℃～55 ℃ constant temperature, make beam body concrete intensity reach 60%～65% of design strength, therefore the demoulding can reduce cost with this understanding, improves effect.Broken away from the PC track girder under the condition of side form steam-cured 4 hours of PC track girder continuity constant temperature, make beam body concrete intensity 〉=75% design strength, value of concrete strength eases up, lower the temperature steam-cured gradually with＜5 ℃/hour subsequently, can make the beam body except that bed die fully with steam in moisture fully contact, hydrated reaction of cement is more abundant in its concrete, and mechanical properties of concrete is improved.With the PC track girder when the mould chamber moves to moist closet by passage, the temperature-difference of mould chamber, moist closet, passage can not＞5 ℃, make the PC track girder can not guarantee its quality because of excessive temperature differentials formation temperature contraction fissure from the mould chamber to moist closet.The temperature of control moist closet is 40～50 ℃, makes itself and difference from the surface temperature of the PC track girder of the mould chamber demoulding be no more than 15 ℃, and the beam body does not crack.Owing in moist closet, the continuity of the PC track girder after demoulding steam curing is not needed the dedicated side template, can improve rate of moulds turn-over, enhance production progress can make the PC track girder obtain the steam curing of grace time again in moist closet, guarantees the quality of PC track girder.
The present invention is described further below in conjunction with accompanying drawing.
(4) description of drawings
Fig. 1 is a process chart of the present invention;
Fig. 2 is a temperature control system structure diagram of the present invention.
(5) specific embodiment
Embodiment 1
Referring to Fig. 1 and Fig. 2.Chassis is sent to the mould chamber that is provided with steaming and cultivating equipment, chassis is carried out flat, adjustment side form, after it reaches technological requirement, with concreting PC track girder, flat, the plucking of receipts, quietly stopped preserving moisture 4 hours,, make the mould room temperature reach 45 ℃ to heat up in＜15 ℃/hour the speed moulds, constant temperature steam curing is 4 hours in the mould, promptly carries out the demoulding.Before the demoulding, sealing is provided with the moist closet of steaming and cultivating equipment, and moist closet is supplied steam in advance.When treating in the moist closet temperature increase to 45 ℃, sealing connects the top and the both sides of mould chamber and the passage of moist closet, the Qianmen of opening moist closet, and the steam admission passage makes temperature rising and mould chamber, moist closet in the passage consistent, the temperature difference＜5 ℃.Throw off beam side template, open the back door of mould chamber, the beam body is moved to moist closet with hoist engine traction chassis, with guarantee continuity steam strange land maintenance and again thermostatic process can not form the excessive temperature difference.After PC track girder integral body enters moist closet, seal moist closet once more, moist closet continuity constant temperature steam curing 4 hours, supply steam by moist closet to the beam body therebetween, temperature is controlled at 40 ℃.Four temperature measuring heads 2 that will be connected with temperature indicator 3 are placed along beam body 1 axis branch simultaneously, and the placement location of temperature measuring head is arranged apart from beam-ends L/8,3L/8,5L/8,7L/8 respectively with the axis beam length L of PC track girder.Temperature measuring head 2 is near beam body 1 and keep certain distance, to guarantee the precision to the ambient temperature measurement of close beam body.When the temperature difference＞5 between each point for measuring temperature ℃ or temperature surpass this during temperature requirements in stage, promptly, increase or reduce the steam supply and control temperature to OK range by regulating and this place's temperature measuring head 2 corresponding steam supply gate valves.Continuity constant temperature steam curing reduces steam supply after 4 hours gradually, and it is steam-cured to lower the temperature gradually by＜5 ℃/hour speed, and too fast beam body cracks to prevent to lower the temperature.When being cooled to 30 ℃, stablized 6 hours, allow after the further reduction of beam body internal temperature, continue again to lower the temperature gradually by＜5 ℃/hour speed.Treat mobile temperature measuring head contact beam body, when recording beam surface temperature and the outdoor environment temperature temperature difference＜10 ℃, the beam body is shifted out moist closet carry out natural curing.Enter moist closet when the PC track girder breaks away from dedicated templates, behind the sealing moist closet, the mould chamber stops to open mould chamber and passage simultaneously for steam, and the mould chamber is cleared up, and makes a living to give birth to a Pin beam and prepare, and has accelerated rate of moulds turn-over, has improved production efficiency.
Chassis is sent to the mould chamber that is provided with steaming and cultivating equipment, chassis is carried out flat, adjustment side form, after it reaches technological requirement, with concreting PC track girder, flat, the plucking of receipts, quietly stopped preserving moisture 4 hours,, make the mould room temperature reach 50 ℃ to heat up in＜15 ℃/hour the speed moulds, constant temperature steam curing is 4 hours in the mould, promptly carries out the demoulding.Before the demoulding, sealing is provided with the moist closet of steaming and cultivating equipment, and moist closet is supplied steam in advance.When treating in the moist closet temperature increase to 50 ℃, sealing connects the top and the both sides of mould chamber and the passage of moist closet, the Qianmen of opening moist closet, and the steam admission passage makes temperature rising and mould chamber, moist closet in the passage consistent, the temperature difference＜5 ℃.Throw off beam side template, open the back door of mould chamber, the beam body is moved to moist closet with hoist engine traction chassis, with guarantee continuity steam strange land maintenance and again thermostatic process can not form the excessive temperature difference.After PC track girder integral body enters moist closet, seal moist closet once more, moist closet continuity constant temperature steam curing 4 hours, supply steam by moist closet to the beam body therebetween, temperature is controlled at 45 ℃.Four temperature measuring heads 2 that will be connected with temperature indicator 3 are placed along beam body 1 axis branch simultaneously, and the placement location of temperature measuring head is arranged apart from beam-ends L/8,3L/8,5L/8,7L/8 respectively with the axis beam length L of PC track girder.Temperature measuring head 2 is near beam body 1 and keep certain distance, to guarantee the precision to the ambient temperature measurement of close beam body.When the temperature difference＞5 between each point for measuring temperature ℃ or temperature surpass this during temperature requirements in stage, promptly, increase or reduce the steam supply and control temperature to OK range by regulating and this place's temperature measuring head 2 corresponding steam supply gate valves.Continuity constant temperature steam curing reduces steam supply after 4 hours gradually, and it is steam-cured to lower the temperature gradually by＜5 ℃/hour speed, and too fast beam body cracks to prevent to lower the temperature.When being cooled to 32.5 ℃, stablized 7 hours, allow after the further reduction of beam body internal temperature, continue again to lower the temperature gradually by＜5 ℃/hour speed.Treat mobile temperature measuring head contact beam body, when recording beam surface temperature and the outdoor environment temperature temperature difference＜10 ℃, the beam body is shifted out moist closet carry out natural curing.Enter moist closet when the PC track girder breaks away from dedicated templates, behind the sealing moist closet, the mould chamber stops to open mould chamber and passage simultaneously for steam, and the mould chamber is cleared up, and makes a living to give birth to a Pin beam and prepare, and has accelerated rate of moulds turn-over, has improved production efficiency.
Chassis is sent to the mould chamber that is provided with steaming and cultivating equipment, chassis is carried out flat, adjustment side form, after it reaches technological requirement, with concreting PC track girder, flat, the plucking of receipts, quietly stopped preserving moisture 4 hours,, make the mould room temperature reach 55 ℃ to heat up in＜15 ℃/hour the speed moulds, constant temperature steam curing is 4 hours in the mould, promptly carries out the demoulding.Before the demoulding, sealing is provided with the moist closet of steaming and cultivating equipment, and moist closet is supplied steam in advance.When treating in the moist closet temperature increase to 55 ℃, sealing connects the top and the both sides of mould chamber and the passage of moist closet, the Qianmen of opening moist closet, and the steam admission passage makes temperature rising and mould chamber, moist closet in the passage consistent, the temperature difference＜5 ℃.Throw off beam side template, open the back door of mould chamber, the beam body is moved to moist closet with hoist engine traction chassis, with guarantee continuity steam strange land maintenance and again thermostatic process can not form the excessive temperature difference.After PC track girder integral body enters moist closet, seal moist closet once more, moist closet continuity constant temperature steam curing 4 hours, supply steam by moist closet to the beam body therebetween, temperature is controlled at 50 ℃.Four temperature measuring heads 2 that will be connected with temperature indicator 3 are placed along beam body 1 axis branch simultaneously, and the placement location of temperature measuring head is arranged apart from beam-ends L/8,3L/8,5L/8,7L/8 respectively with the axis beam length L of PC track girder.Temperature measuring head 2 is near beam body 1 and keep certain distance, to guarantee the precision to the ambient temperature measurement of close beam body.When the temperature difference＞5 between each point for measuring temperature ℃ or temperature surpass this during temperature requirements in stage, promptly, increase or reduce the steam supply and control temperature to OK range by regulating and this place's temperature measuring head 2 corresponding steam supply gate valves.Continuity constant temperature steam curing reduces steam supply after 4 hours gradually, and it is steam-cured to lower the temperature gradually by＜5 ℃/hour speed, and too fast beam body cracks to prevent to lower the temperature.When being cooled to 35 ℃, stablized 8 hours, allow after the further reduction of beam body internal temperature, continue again to lower the temperature gradually by＜5 ℃/hour speed.Treat mobile temperature measuring head contact beam body, when recording beam surface temperature and the outdoor environment temperature temperature difference＜10 ℃, the beam body is shifted out moist closet carry out natural curing.Enter moist closet when the PC track girder breaks away from dedicated templates, behind the sealing moist closet, the mould chamber stops to open mould chamber and passage simultaneously for steam, and the mould chamber is cleared up, and makes a living to give birth to a Pin beam and prepare, and has accelerated rate of moulds turn-over, has improved production efficiency.
Prestressed concrete track girder continuity steam curing process of the present invention, constant temperature steam curing breaks away from side form midway in the mould chamber in employing, constant temperature, cooling steam-cured continuity steam-cured technology again behind the constant temperature strange land, make the beam body concrete except that bed die fully with steam in moisture fully contact, hydrated reaction of cement is more abundant in its concrete, and mechanical properties of concrete obtains stable the raising.Especially shortened the holding time of particular manufacturing craft, accelerated rate of moulds turn-over, made a special production line can produce a Pin prestressed concrete track girder every day, output is a times of former technology, has improved production efficiency.
Technology of the present invention, be applicable to also that utilization particular manufacturing craft chamber is steam-cured,＜25 ℃/hour, 45～80 ℃ constant temperature demouldings that heat up, cooling＜25 ℃/hour, go out room temperature poor＜production of 20 ℃ prefabricated components.
Claims (3)
1. a prestressed concrete track girder continues steam curing process, chassis enters the mould chamber that is provided with steaming and cultivating equipment, and to carry out chassis more flat, adjust side form, concreting, receive flat, plucking, quiet stopping preserved moisture, intensification steam curing in the mould, constant temperature steam curing in the mould, it is characterized in that: 45～55 ℃ of temperature constant state bottom knockouts in the mould chamber, be transported to temperature at 40～50 ℃ the moist closet that is provided with steaming and cultivating equipment with the beam body of chassis after by passage constant temperature with the demoulding, 40～50 ℃ of continuities of moist closet constant temperature steam curing 4 hours, lower the temperature steam-cured gradually with＜5 ℃/hour then, when treating beam surface temperature and the outdoor environment temperature temperature difference＜15 ℃, prefabricated component is shifted out moist closet carry out natural curing.
2. prestressed concrete track girder according to claim 1 continuity steam curing process is characterized in that: the demoulding when mould indoor environment temperature is lower than 10 ℃ of prestressed concrete track girder surface temperatures.
3. prestressed concrete track girder according to claim 1 continuity steam curing process is characterized in that: with prestressed concrete track girder when the mould chamber moves to moist closet, the temperature difference of mould chamber, moist closet, passage can not＞5 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031355935A CN100336648C (en) | 2003-08-12 | 2003-08-12 | Prestressed concrete track beam continuing steam curing process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031355935A CN100336648C (en) | 2003-08-12 | 2003-08-12 | Prestressed concrete track beam continuing steam curing process |
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| CN1579723A CN1579723A (en) | 2005-02-16 |
| CN100336648C true CN100336648C (en) | 2007-09-12 |
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| CNB031355935A Expired - Fee Related CN100336648C (en) | 2003-08-12 | 2003-08-12 | Prestressed concrete track beam continuing steam curing process |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102001848B (en) * | 2010-11-15 | 2012-07-25 | 中南大学 | Steamed high-performance concrete and preparation method thereof |
| CN102601859B (en) * | 2012-03-22 | 2014-07-23 | 东莞市利鹏建材有限公司 | Transporting device used in ceramsite board production equipment |
| CN102862227B (en) * | 2012-09-21 | 2014-10-22 | 江苏高博智融科技有限公司 | Steam curing process for cob composite concrete sleeper |
| CN103056963B (en) * | 2012-12-14 | 2014-08-20 | 陈斌 | Treatment device and treatment process before steam curing for steam-cured bricks |
| CN107322779A (en) * | 2017-07-18 | 2017-11-07 | 江苏汤辰机械装备制造股份有限公司 | A kind of PC components automatic production line and production procedure technique |
| CN109291208B (en) * | 2018-10-29 | 2023-10-13 | 马鞍山钢铁建设集团有限公司 | Large-span prestressed concrete double-T-plate construction method |
| CN110053145A (en) * | 2019-04-15 | 2019-07-26 | 甘肃鸿盛岩棉科技有限公司 | A kind of materials for wall and its processing method |
| CN113370367B (en) * | 2021-06-29 | 2022-05-13 | 保利长大工程有限公司 | Combined UHPC (ultra high performance polycarbonate) curing method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2269942Y (en) * | 1996-09-11 | 1997-12-10 | 张玉华 | Device for producing light hollow concrete wall board |
| CN1293165A (en) * | 2000-09-19 | 2001-05-02 | 宁夏发荣农工科贸有限公司 | Sound-isolating superlight concrete product for building |
| CN1319485A (en) * | 2001-04-09 | 2001-10-31 | 武汉大学 | Bracking-resistant method for high-strength concrete |
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2003
- 2003-08-12 CN CNB031355935A patent/CN100336648C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2269942Y (en) * | 1996-09-11 | 1997-12-10 | 张玉华 | Device for producing light hollow concrete wall board |
| CN1293165A (en) * | 2000-09-19 | 2001-05-02 | 宁夏发荣农工科贸有限公司 | Sound-isolating superlight concrete product for building |
| CN1319485A (en) * | 2001-04-09 | 2001-10-31 | 武汉大学 | Bracking-resistant method for high-strength concrete |
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| CN1579723A (en) | 2005-02-16 |
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Granted publication date: 20070912 Termination date: 20100812 |