CN112324140A - Prestressed concrete slab construction method - Google Patents
Prestressed concrete slab construction method Download PDFInfo
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- CN112324140A CN112324140A CN202011238503.4A CN202011238503A CN112324140A CN 112324140 A CN112324140 A CN 112324140A CN 202011238503 A CN202011238503 A CN 202011238503A CN 112324140 A CN112324140 A CN 112324140A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
- E04B5/16—Load-carrying floor structures wholly or partly cast or similarly formed in situ
- E04B5/32—Floor structures wholly cast in situ with or without form units or reinforcements
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- Civil Engineering (AREA)
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Abstract
The application relates to a prestressed concrete slab construction method, which comprises the following steps: material and tool preparation; erecting a bottom film, binding a steel bar framework, and fixing a steel bar support in the steel bar framework; the corrugated pipe with the prestressed tendons is arranged in the steel bar support in a penetrating mode, and the spiral tendons and the anchor backing plate are arranged at two ends of the prestressed tendons; closing the side end template, and pouring concrete; laying a coating piece above the concrete to form a coating space, introducing hot steam into the coating space, introducing a heat supply medium into the corrugated pipe, and keeping the temperature difference between the hot steam introduced into the coating space and the heat supply medium in the corrugated pipe not higher than 5 ℃; after the concrete setting strength reaches 85% -90% of the preset strength, removing the side end template, and tensioning the prestressed tendons by using a tensioning device; grouting into the corrugated pipe forming the pore channel, and sealing and protecting two ends of the pore channel after grouting is finished. This application is when shortening maintenance time, can effectively keep the intensity after the concrete condenses.
Description
Technical Field
The application relates to the technical field of cast-in-place floor slabs, in particular to a prestressed concrete slab construction method.
Background
Reinforced concrete slabs are increasingly used in construction engineering, in which reinforcing steel bars are tensioned mainly by external force application, and the tension area of the concrete slab is pre-stressed by the retraction force of the reinforcing steel bars. The stored pre-stress can counteract partial tension on the concrete slab caused by external force, so as to limit the elongation of the concrete and delay the occurrence of cracks.
The construction method of the concrete slab mainly comprises the following steps: the prestressed tendons penetrate through the steel bar framework before pouring, then the concrete is poured by sealing the mold and is naturally maintained, after the concrete setting strength reaches the expected strength, the prestressed tendons are tensioned by using a tensioning device, and finally the hole channels are filled with glue and are anchored and protected.
In view of the above-mentioned related technologies, the inventor thinks that the time of natural curing is long, and the overall construction progress is easily influenced.
Disclosure of Invention
In order to improve the overall construction progress, the application provides a prestressed concrete slab construction method.
The construction method of the prestressed concrete slab adopts the following technical scheme.
A prestressed concrete slab construction method, characterized by comprising the steps of:
s1, preparing materials and appliances;
s2, erecting a bottom film, binding a steel bar frame, and fixing a steel bar support in the steel bar frame along a preset channel path;
s3, the corrugated pipe with the prestressed tendons is arranged in the steel bar support in a penetrating mode along the arrangement direction of the steel bar support, and the spiral tendons and the anchor backing plates are arranged at the two ends of the prestressed tendons;
s4, closing the side end formwork, and pouring concrete;
s5, arranging a coating piece above the concrete to form a coating space, introducing hot steam into the coating space for maintenance, introducing a heat supply medium into the corrugated pipe, and keeping the temperature difference between the hot steam introduced into the coating space and the heat supply medium in the corrugated pipe not higher than 5 ℃;
s6, after the concrete setting strength reaches 85% -90% of the preset strength, removing the side end template, and tensioning the prestressed tendons by using a tensioning device;
and S7, grouting into the corrugated pipe forming the pore channel, and after grouting is finished, sealing and protecting two ends of the pore channel.
By adopting the technical scheme, heat steam in the coating space and heat supply media in the corrugated pipes are used for supplying heat and maintaining the poured concrete, so that the condensation speed of the concrete in the maintenance stage is accelerated; meanwhile, the temperature difference between the hot steam in the coating space and the heat supply medium in the corrugated pipe is controlled to be not higher than 5 ℃, so that the inner part and the outer surface of the concrete in the condensation process are heated more uniformly, the condition of cracks caused by large internal and external heated temperature difference in the condensation process of the concrete is reduced, the curing time is shortened, and the strength of the condensed concrete is effectively maintained.
Preferably, in step S5, the heat supply medium is hot air; one end of the corrugated pipe is communicated with the outside, and hot air is continuously introduced from the other end of the corrugated pipe.
Through adopting above-mentioned technical scheme, continuous input hot-air in the bellows reaches the effect that provides the heating medium to the bellows.
Preferably, in step S5, the heat supply medium is hot steam.
Through adopting above-mentioned technical scheme, compare in hot-air, hot steam can be better store the heat with the release, and be convenient for control the temperature of the hot steam among the transportation process to it is close to keep the concrete to be heated the temperature inside and outside the process of condensing.
Preferably, in step S5, both ends of the corrugated tube are connected to the coating space, and hot steam is introduced into the corrugated tube and the coating space.
Through adopting above-mentioned technical scheme, the both ends pronunciation cladding space of bellows is linked together, lets in bellows and cladding space hot steam simultaneously, reduces the hot steam temperature difference of input in bellows and the cladding space conveniently.
Preferably, in step S5, introducing hot steam into the coating space for curing, and dividing the curing into an initial curing stage, a heating curing stage, a constant-temperature curing stage and a cooling curing stage; in the initial setting and curing stage, the temperature of the introduced hot steam is higher than or equal to the external environment temperature, the difference between the temperature of the introduced hot steam and the external environment temperature is not more than 10 ℃, and the temperature is kept for 3-4 hours; in the constant-temperature curing stage, introducing hot steam at 50-60 deg.C, and maintaining the temperature for 8-10 hr; in the temperature-rising curing stage, the temperature of the introduced hot steam is gradually raised from the temperature of the initial setting curing stage to the constant-temperature curing stage; in the cooling and curing stage, the temperature of the introduced hot steam is gradually reduced to be the same as the temperature of the external environment.
Through adopting above-mentioned technical scheme, let in the less hot steam of difference in temperature with ambient temperature at initial setting maintenance stage, reduce the influence of high temperature to concrete static stop initial setting to cement carries out the hydration of a period in the assurance concrete, so that concrete slab reaches certain intensity, makes the condition that self structure produced the crackle because of concrete volume expansion in order to reduce concrete slab at the intensification maintenance stage.
Preferably, in the temperature rising curing stage and the temperature reducing curing stage, the temperature change rate of the introduced hot steam is lower than 8 ℃/h.
By adopting the technical scheme, the temperature change rate of the hot steam is controlled in the heating maintenance stage and the cooling maintenance stage, and the condition that the concrete condensation strength is influenced by sudden temperature rise and sudden temperature drop of the hot steam is reduced.
Preferably, when the concrete condensation strength reaches 75-80% of the preset strength, the introduction of hot steam into the corrugated pipe is stopped; one end of the corrugated pipe is communicated with the outside, dry hot air is introduced from the other end of the corrugated pipe, and the difference value of air humidity at the air inlet end and the air outlet end of the corrugated pipe is kept to be less than 2% for at least 0.5h, so that the inside of the corrugated pipe is dried.
Through adopting above-mentioned technical scheme, can leave the residual water in the bellows unavoidably after letting in hot steam in the bellows, to the bellows through dry hot-air, can play dry effect to the inside of bellows.
Preferably, in step S4, the concrete is poured in two steps, the height of the first pouring is 1/3-1/2 of the total height, and after the concrete is compacted by a vibrator, the concrete in the upper layer is poured.
Through adopting above-mentioned technical scheme, divide twice to pour the concrete, be convenient for carry out the tamping to the concrete of pouring to keep the closely knit degree after the concrete placement.
In summary, the present application includes at least one of the following beneficial technical effects:
the setting speed of the concrete in the curing stage is accelerated, the inner surface and the outer surface of the concrete in the setting process can be heated more uniformly, the condition of cracks caused by large internal and external heating temperature difference in the setting process of the concrete is reduced, the curing time is shortened, and the strength of the concrete after setting is effectively maintained;
hot air is used as a heat supply medium in the corrugated pipe, so that the drying in the corrugated pipe can be kept while heat is supplied to the corrugated pipe;
the corrugated pipe is communicated with the coating space, and only the same hot steam supply equipment is used for supplying heat to the corrugated pipe and the coating space, so that the energy is saved, and the temperature difference between the hot steam in the coating space and the heat supply medium in the corrugated pipe is convenient to control to be not higher than 5 ℃.
Drawings
FIG. 1 is a schematic process flow diagram of an embodiment of the present application.
Fig. 2 is a schematic cross-sectional structure diagram of embodiment 1 of the present application.
Fig. 3 is a schematic cross-sectional structure of embodiment 2 of the present application.
Description of reference numerals: 1. a floral tube; 11. a gas delivery pipe; 2. coating a film; 21. a cladding space; 3. a bellows; 4. a steam generator; 5. a hot air engine; 6. a humidity measuring meter; 7. a base film; 8. and a side end template.
Detailed Description
Example 1.
Referring to fig. 1 and 2, the embodiment of the application discloses a prestressed concrete slab construction method, and in particular, the prestressed concrete slab construction method comprises the following steps:
s1, material and instrument preparation. Specifically, the material comprises a template, reinforcing steel bars, concrete, prestressed tendons, a corrugated pipe 3, spiral tendons, an anchor backing plate, a perforated pipe 1 and the like, and the device comprises a vibrating rod, a steam generator 4, a hot air blower, a grinding wheel saw, a jack and the like.
S2, erecting a bottom film 7, manually binding a steel bar frame, and fixing a steel bar support in the steel bar frame along a preset channel path; specifically, the reinforcing steel bar support can be bound in the reinforcing steel bar frame by using an iron wire, or the reinforcing steel bar support is welded in the reinforcing steel bar frame by using a welding mode.
S3, penetrating the prestressed tendons into the corrugated pipe 3, penetrating the corrugated pipe 3 penetrated with the prestressed tendons through the steel bar support one by one along the arrangement direction of the steel bar support, and fixing and binding the corrugated pipe 3 by using iron wires; then, the spiral bars and the anchor backing plates are installed at the two ends of the prestressed tendons.
S4, sealing the side end template 8, and pouring concrete after the sealing performance is detected to be qualified; wherein the slump of the concrete is not less than 180mm, and the maximum particle size of the coarse aggregate in the concrete is 25-30 mm.
Pouring the concrete twice, wherein the height of the first pouring is 1/2 of the total height of the concrete slab; after the first pouring is finished, the concrete is vibrated to be compact by using the vibrating rod.
And the upper surface of the concrete does not descend any more, and the upper layer of concrete is poured before the initial setting of the first poured concrete.
S5, uniformly erecting a plurality of perforated pipes 1 above the concrete, wherein all the perforated pipes 1 are communicated with gas conveying pipes 11. Meanwhile, a coating film 2 is laid on the erected perforated pipe 1, so that a coating space 21 is formed on the upper side of the concrete; the coating space 21 is for coating concrete, and the coating space 21 is not sealed.
Then, the steam generator 4 is communicated with the gas pipe 11, so that hot steam is introduced into the coating space 21 through the gas pipe 11 and the perforated pipe 1 by the steam generator 4 for curing. Specifically, the curing by introducing hot steam into the coating space 21 is divided into an initial curing stage, a temperature-raising curing stage, a constant-temperature curing stage and a temperature-lowering curing stage.
Wherein in the initial setting and curing stage, the temperature of the introduced hot steam is higher than or equal to the external environment temperature, the difference between the temperature of the introduced hot steam and the external environment temperature is not more than 10 ℃, and the temperature is maintained for 3-4 h; in the constant-temperature curing stage, the temperature of the introduced hot steam is 50-60 ℃, and the temperature is maintained for 8-10 h. In the temperature-rising curing stage, the temperature of the introduced hot steam is gradually increased from the temperature in the initial setting curing stage to the temperature in the constant-temperature curing stage at the change rate of 5 ℃/h; in the temperature reduction and maintenance stage, the temperature of the introduced hot steam is gradually reduced to be the same as the external environment temperature at the change rate of 5 ℃/h.
Meanwhile, the heat engine 5 is communicated with one end of the corrugated pipe 3, the other end of the corrugated pipe 3 is communicated with the outside, and hot air is introduced into the corrugated pipe 3 through the heat engine 5. In addition, in the four stages of maintenance, the temperature difference between the hot steam introduced into the coating space 21 and the hot air introduced into the corrugated pipe 3 is always kept within 5 ℃.
S6, after the maintenance in the step S5 is finished, the coating film 2 and the flower tube 1 are removed; and (4) after the concrete is naturally cured by sprinkling water until the concrete condensation strength reaches 90% of the preset strength, removing the side end template 8, and tensioning the prestressed tendons by using a jack and an oil pump.
And S7, grouting into the corrugated pipe 3 forming the pore path, cutting off the prestressed ribs exposed out of the side wall of the concrete slab by using a grinding wheel saw after grouting is finished, and pouring the two ends of the pore path by using concrete so as to seal and anchor the two ends of the corrugated pipe 3.
And finally, removing the bottom film 7 to obtain a concrete slab finished product.
The implementation principle of the prestressed concrete slab construction method in the embodiment of the application is as follows: the heat steam in the coating space 21 and the hot air in the corrugated pipe 3 are used for supplying heat and curing the poured concrete, so that the condensation speed of the concrete in the curing stage is increased. Meanwhile, the temperature difference between the hot steam in the coating space 21 and the heat supply medium in the corrugated pipe 3 is controlled within 5 ℃, so that the inner part and the outer surface of the concrete are heated more uniformly in the condensation process, the condition of cracks caused by large internal and external heated temperature difference in the condensation process of the concrete is reduced, the curing time is shortened, and the strength of the condensed concrete is effectively maintained.
Example 2:
referring to fig. 1 and 3, an embodiment of the present application discloses a prestressed concrete slab construction method, which is different from embodiment 1 in that: in step S5, hot steam is introduced into the bellows 3 instead of hot air to supply heat to the bellows 3.
Specifically, in step S5, after the coating film 2 is spread, one end of the corrugated tube 3 is communicated with the coating space 21, the other end of the corrugated tube 3 is communicated with the air pipe 11, and the steam generator 4 is used to simultaneously introduce hot steam into the corrugated tube 3 and the air pipe 11, so as to simultaneously introduce hot steam into the corrugated tube 3 and the coating space 21.
Meanwhile, the temperature of the steam generator 4 outputting hot steam is controlled corresponding to four stages of an initial curing stage, a heating curing stage, a constant-temperature curing stage and a cooling curing stage in concrete curing. When the concrete setting strength reaches 75-80% of the preset strength, detaching one end of the corrugated pipe 3 communicated with the gas pipe 11 to ensure that the other end of the corrugated pipe 3 is communicated with the outside, and respectively installing a humidity measuring meter 6 at two ends of the corrugated pipe 3; then, dry hot air is blown into the corrugated pipe 3 from one end of the corrugated pipe 3 by using the hot air engine 5 until the air humidity difference between the air inlet end and the air outlet end of the corrugated pipe 3 is less than 2% and is maintained for at least 0.5h, so that the effect of drying the interior of the corrugated pipe 3 is achieved. In the process of drying the corrugated pipe 3, if the stage of passing the hot steam in the coating space 21 is still in place, the temperature difference between the hot air introduced into the corrugated pipe 3 and the hot steam introduced into the coating space 21 needs to be kept less than 5 ℃.
And then, continuing to the steps S6 and S7, and removing the bottom film 7 to obtain the finished concrete slab.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. A prestressed concrete slab construction method, characterized by comprising the steps of:
s1, preparing materials and appliances;
s2, erecting a bottom film (7), binding a steel bar frame, and fixing a steel bar support in the steel bar frame along a preset channel path;
s3, the corrugated pipe (3) with the prestressed tendons is arranged in the reinforcing steel bar bracket in a penetrating way along the arrangement direction of the reinforcing steel bar bracket, and the spiral tendons and the anchor backing plates are arranged at the two ends of the prestressed tendons;
s4, sealing the side end formwork (8), and pouring concrete;
s5, laying a coating piece above the concrete to form a coating space (21), introducing hot steam into the coating space (21) for maintenance, introducing a heat supply medium into the corrugated pipe (3), and keeping the temperature difference between the hot steam introduced into the coating space (21) and the heat supply medium in the corrugated pipe (3) not higher than 5 ℃;
s6, after the concrete setting strength reaches 85% -90% of the preset strength, removing the side end template (8), and tensioning the prestressed tendons by using a tensioning device;
and S7, grouting into the corrugated pipe (3) forming the pore channel, and sealing and protecting two ends of the pore channel after grouting is finished.
2. The prestressed concrete slab construction method as set forth in claim 1, wherein: in step S5, the heat supply medium is hot air; one end of the corrugated pipe (3) is communicated with the outside, and hot air is continuously introduced from the other end of the corrugated pipe (3).
3. The prestressed concrete slab construction method as set forth in claim 1, wherein: in step S5, the heat supply medium is hot steam.
4. A prestressed concrete slab construction method as claimed in claim 3, wherein: in step S5, both ends of the corrugated tube (3) are communicated with the coating space (21), and hot steam is introduced into the corrugated tube (3) and the coating space (21).
5. The prestressed concrete slab construction method as set forth in claim 1, wherein: in the step S5, introducing hot steam into the coating space (21) for curing, and dividing the curing into an initial setting curing stage, a heating curing stage, a constant temperature curing stage and a cooling curing stage;
in the initial setting and curing stage, the temperature of the introduced hot steam is higher than or equal to the external environment temperature, the difference between the temperature of the introduced hot steam and the external environment temperature is not more than 10 ℃, and the temperature is kept for 3-4 hours;
in the constant-temperature curing stage, introducing hot steam at 50-60 deg.C, and maintaining the temperature for 8-10 hr;
in the temperature-rising curing stage, the temperature of the introduced hot steam is gradually raised from the temperature of the initial setting curing stage to the constant-temperature curing stage;
in the cooling and curing stage, the temperature of the introduced hot steam is gradually reduced to be the same as the temperature of the external environment.
6. The prestressed concrete slab construction method as set forth in claim 5, wherein: in the temperature rising curing stage and the temperature reducing curing stage, the temperature change rate of the introduced hot steam is lower than 8 ℃/h.
7. A prestressed concrete slab construction method as claimed in claim 3 or 4, wherein: when the concrete condensation strength reaches 75-80% of the preset strength, stopping introducing hot steam into the corrugated pipe (3); one end of the corrugated pipe (3) is communicated with the outside, dry hot air is introduced from the other end of the corrugated pipe (3) until the difference between the air humidity at the air inlet end and the air humidity at the air outlet end of the corrugated pipe (3) is kept less than 2% for at least 0.5h, so as to dry the inside of the corrugated pipe (3).
8. The prestressed concrete slab construction method as set forth in claim 1, wherein: in step S4, the concrete is poured twice, the height of the first pouring is 1/3-1/2 of the total height, and the concrete is compacted by a vibrating rod and then the concrete on the upper layer is poured.
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| CN202011238503.4A CN112324140A (en) | 2020-11-09 | 2020-11-09 | Prestressed concrete slab construction method |
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| CN202011238503.4A CN112324140A (en) | 2020-11-09 | 2020-11-09 | Prestressed concrete slab construction method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113386242A (en) * | 2021-06-08 | 2021-09-14 | 华恒建设集团有限公司 | Special-shaped concrete line mold and construction process thereof |
| CN113565149A (en) * | 2021-07-07 | 2021-10-29 | 深圳市中地建设工程有限公司 | Leaking stoppage construction method by external bar planting method between piles |
| CN113738064A (en) * | 2021-09-30 | 2021-12-03 | 中建五局第三建设有限公司 | Structural terrace heat insulation structure and construction method |
| CN115405119A (en) * | 2022-09-20 | 2022-11-29 | 中国石油化工集团有限公司 | Construction process for heating and insulating concrete on outer tank wall of full-capacity low-temperature storage tank in winter |
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Application publication date: 20210205 |