CN113235887A - Large-area ultra-leveling concrete floor flatness control device and construction method - Google Patents
Large-area ultra-leveling concrete floor flatness control device and construction method Download PDFInfo
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- CN113235887A CN113235887A CN202110484859.4A CN202110484859A CN113235887A CN 113235887 A CN113235887 A CN 113235887A CN 202110484859 A CN202110484859 A CN 202110484859A CN 113235887 A CN113235887 A CN 113235887A
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- 238000010276 construction Methods 0.000 title claims abstract description 63
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 32
- 239000010959 steel Substances 0.000 claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 29
- 239000002994 raw material Substances 0.000 claims abstract description 6
- 238000002360 preparation method Methods 0.000 claims abstract description 4
- 230000008569 process Effects 0.000 claims description 25
- 238000007790 scraping Methods 0.000 claims description 13
- 239000004568 cement Substances 0.000 claims description 9
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 239000004744 fabric Substances 0.000 claims description 6
- 239000010881 fly ash Substances 0.000 claims description 5
- 230000007480 spreading Effects 0.000 claims description 5
- 238000003892 spreading Methods 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 claims description 4
- 239000003513 alkali Substances 0.000 claims description 3
- 238000009415 formwork Methods 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 238000003672 processing method Methods 0.000 claims description 3
- 239000010409 thin film Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract 1
- 238000005498 polishing Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 239000002344 surface layer Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000003306 harvesting Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F21/00—Implements for finishing work on buildings
- E04F21/20—Implements for finishing work on buildings for laying flooring
- E04F21/24—Implements for finishing work on buildings for laying flooring of masses made in situ, e.g. smoothing tools
-
- 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
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F15/00—Flooring
- E04F15/12—Flooring or floor layers made of masses in situ, e.g. seamless magnesite floors, terrazzo gypsum floors
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F21/00—Implements for finishing work on buildings
- E04F21/20—Implements for finishing work on buildings for laying flooring
-
- 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
- E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
- E04G21/06—Solidifying concrete, e.g. by application of vacuum before hardening
- E04G21/063—Solidifying concrete, e.g. by application of vacuum before hardening making use of vibrating or jolting tools
-
- 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
- E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
- E04G21/10—Devices for levelling, e.g. templates or boards
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
The invention particularly relates to a flatness control device and a construction method for a large-area ultra-flat concrete floor; the method comprises the following steps of (1) defining the requirements of raw materials; designing the mixing proportion; preparation and transportation; seamless construction of concrete ground; setting a construction joint; arranging a vibration bridge guide rail bracket system; the template is used for laterally supporting the screw rod, the lateral rigidity of the screw rod is guaranteed, the vibration bridge guide rail is an angle steel, holes are formed in the angle steel, the angle steel is fixed with the screw rod through nuts, the height of each nut is adjusted to adjust the elevation of the guide rail, the elevation of the guide rail is uniformly adjusted through the accurate level, and the elevation is ensured through the fastening of the nuts. According to the invention, the appearance quality, the terrace flatness and the levelness of the large-area super-smooth concrete floor are realized by selecting the raw materials of the concrete floor, designing and preparing the mixture ratio, adopting a seamless construction technology, controlling the floor elevation, vibrating and polishing the concrete, and the construction is carried out by adopting a skip method, so that the field engineering progress is effectively accelerated, and the comprehensive construction benefit is improved.
Description
Technical Field
The invention relates to the field of civil construction, in particular to a flatness control device for a large-area ultra-flat concrete floor and a construction method.
Background
With the development of national economy in China, the living standard of people is improved, and the requirements on the functions of buildings are gradually improved. The building with the ultra-long and ultra-wide plane size rapidly emerges, and is mainly used for projects such as large-scale public buildings, industrial plants, logistics storage, airport shutdown, runways and the like. Meanwhile, one layer structure cannot meet the use requirement, and two-layer, three-layer and multi-layer structures are produced at the same time. The construction of the high-altitude ultra-large area concrete terrace becomes a construction difficulty.
In view of the requirements of building and structure integrity, use function and construction period, most of the ground (or floor) of the building needs to be formed at one time, the traditional process is adopted, only local elevation control is carried out on the thickness of the floor, the rest parts are completely constructed by means of manual skill and visual observation of workers, local floor elevation is easily too high or too low, the integral flatness and levelness of the floor are affected, and the use requirement cannot be met.
Meanwhile, due to the fact that large-area floors are designed to avoid the situations of shrinkage joints, temperature cracks and the like appearing in the later stage of concrete, post-pouring belts need to be arranged, the inconsistency of concrete materials and performance is caused, the shrinkage of each concrete floor after pouring is inconsistent, the deviation of levelness is generated, and the using function is influenced.
In conclusion, the construction of the large-area ultra-flat concrete terrace is difficult to adopt a conventional construction method, the floor construction is usually an important node on a key line of the engineering construction, the construction quality is ensured, meanwhile, the construction speed must be considered, and the method also brings great challenges to the engineering construction.
Disclosure of Invention
The invention aims to overcome the defects and provide a concrete floor structure which can ensure the appearance quality, the terrace flatness and the levelness of an oversized concrete floor and effectively accelerate the field engineering progress.
In order to achieve the above object, the present invention is realized by:
a flatness control device for a large-area ultra-flat concrete floor and a construction method thereof comprise
in the above-mentioned steps, the step of,
a. paying off and opening the template;
according to the position of a main keel of the support frame and the position of a sub-bin, a screw position line is arranged on the template, a screw hole is arranged on the position line, the diameter of the hole of the template is 1-2 mm larger than that of the screw, so that the screw can freely pass through the hole, and the screw cannot be too loose due to too large size;
b. installing a screw;
according to the thickness of the floor slab and the distance between the main keel and the template, a screw rod with a proper length is selected, and the length of the screw rod is required to be ensured to be smaller than the flange height of one angle steel than the sum of the thickness of the floor slab and the distance between the main keel and the template. The vibration bridge is prevented from walking on the guide rail if the vibration bridge is too long; before the screw penetrates through the template, a rubber pad needs to be sleeved at the bottom of the screw to prevent the screw from sliding on the main keel; a screw with a rubber pad passes through the template hole and falls on the main keel;
c. installing a guide rail;
the guide rail is made of angle steel, one flange of the angle steel is provided with a hole, the hole is close to the other flange, and the diameter of the hole is equal to the diameter of the screw;
after the screw is installed, a first nut is firstly mounted to serve as support of the angle steel guide rail and adjustment of the elevation of the guide rail, the angle steel guide rail penetrates through the screw and falls on the nut, and then a second nut is mounted to fix the angle steel guide rail;
d. adjusting the elevation of the guide rail;
the guide rail elevation adopts accurate surveyor's level to carry out the unwrapping wire, through the upper and lower rotating adjustment guide rail elevation of first nut, the elevation adjustment is accomplished the back, and the second nut of fastening is died first screw rod point guide rail elevation. Adjusting the elevations of the screw point guide rails of the second, third and following screw points by analogy until the elevation of the whole guide rail is adjusted, and then adjusting the elevations of the guide rails of the second, third and following screw points; the plurality of guide rails form a floor elevation control surface, and after vibration bridge construction, ultrahigh required flatness and levelness of the floor are realized;
e. pouring concrete and vibrating a bridge;
pouring concrete among the guide rails, manually spreading the concrete, wherein the height of the spread concrete is about 10-20 mm higher than that of the guide rails, starting a vibration bridge vibrator after the concrete is primarily spread, vibrating the concrete under the vibration bridge, and simultaneously, the vibration bridge travels forwards under traction at the traveling speed of 0.5 m/s; in the process of the vibration bridge walking, an operator adopts a rake to adjust the thickness of concrete in time and process the concrete scraped by the vibration bridge walking, so as to prevent the concrete from being too thick and toppling on the concrete surface processed by the vibration bridge;
f. dismantling the guide rail and repairing the concrete surface;
after the vibration bridge is initially leveled, the guide rail is manually dismantled before the concrete is initially set, and the dismantled guide rail can be used for later floor construction; in the dismantling process, the concrete pit left after the guide rail is dismantled and moved out must be dismantled, taken and placed lightly, an iron trowel is used for primary leveling, and finally a long scraping ruler is used for overall leveling;
g. finishing and collecting the concrete surface;
after the vibration bridge is primarily leveled, a long scraper is adopted to further polish the concrete surface; the long scraping ruler is made of a square tube, and in the operation process, two persons push the scraping ruler forwards on the guide rail to scrape the long scraping ruler, and the guide rail is removed; removing the guide rail to cause unevenness of the concrete surface, and lightly scraping the concrete surface by using a long scraper; uniformly spreading a carborundum fabric with the thickness of 3mm before the concrete is initially set, and after the carborundum fabric is slightly wet, finishing and finishing by a disc finishing machine;
h. maintaining the concrete floor;
curing the concrete terrace, namely covering, watering and curing by adopting a thin film, wherein the curing time is 14 days;
i. constructing dividing joints;
in order to reduce the large-area concrete shrinkage and the generation of temperature difference cracks, a processing method of cutting dividing seams is adopted in the later period; dividing the joints according to a deepening drawing, wherein the division is not more than 6m multiplied by 6m in principle; and reserving the position of a joint of the column net for each warehouse-dividing construction joint, pulling and aligning the wire saw after the form is removed, and chiseling out a plurality of parts to ensure that the splicing joints are naturally straight after being dried and shrunk.
Compared with the traditional method, the technical content has the following advantages:
(1) by determining the requirements of raw materials and selecting a low hydration heat cementing material, the early temperature crack of the concrete terrace can be effectively prevented. Meanwhile, specific mix proportion design is adopted, specific requirements such as sand rate, water-cement ratio and fly ash mixing amount are determined, the optimal slump of the concrete after reaching a construction site is ensured, compared with the traditional process, the control of the concrete characteristic is increased, the large difference of the floor levelness of each construction joint is reduced after the floor construction is finished, and the integral construction quality of the concrete floor is effectively improved.
(2) The large-area terrace construction adopts an interval construction method, reasonably and effectively avoids stress cracks appearing on a follow-up concrete floor, and compared with a large-area pouring process of a traditional process, the large-area terrace construction process reduces floor repair, greatly improves construction efficiency and achieves the use function.
(3) The elevation is controlled through the angle steel guide rail device, so that the elevation of the whole floor is controlled; through vibrating and trowelling of the vibrating bridge to the concrete, the realization of the integral flatness and levelness of the floor is realized. Compared with the traditional local elevation control process for the reinforcing steel bars, the elevation of the floor slab can be controlled standardly, the condition that unevenness occurs locally is reduced, the requirements of ultrahigh-requirement floor flatness and levelness are met, and the use requirements of users are met.
(4) Meanwhile, the guide rail system can be detached, materials can be recycled, construction materials are saved compared with the embedding of the traditional process, and actual contribution is made to green construction.
Drawings
Fig. 1 is a schematic view of interval construction of the construction method.
FIG. 2 is a schematic view of parting and cutting of the construction method.
FIG. 3 is a schematic view of an elevation control device of the construction method; .
Detailed Description
The invention is further illustrated by the following specific examples.
The total building area of a certain logistics warehouse project is about 110959.73m2, 3 single storehouses of No. 1, No. 2 and No. 3 are provided, the height of the two storeys of the logistics warehouse is 10.5m, the longest warehouse is 204m, the maximum width is 72m, the No. 1 warehouse is 204m 60m, the No. 2 warehouse is 192m 72m, the No. 3 warehouse is 192m 72m, and the plate thickness is 200 mm. The terrace in the warehouse is a carborundum wear-resistant terrace, and the flatness and levelness of the terrace meet the requirements of 4mm/2m of construction ground engineering construction quality acceptance standard GB 50209-2010.
A large-area ultra-flat concrete floor flatness control device and a construction method; as shown in FIGS. 1 to 3;
1) The cement is fly ash cement. Controlling the temperature of cement entering the mixing plant to be below 60 ℃;
2) the aggregate is non-alkali active aggregate, the fine aggregate is medium sand or coarse sand, the coarse aggregate has a particle size of 5.0-31.5 mm, continuous gradation is adopted, and the mud content is controlled to be below 1%;
1) Determining the mixing proportion of the concrete by adopting the strength of 90d, and determining the mixing proportion to be 4.14:6.66:10.64: 1.85;
2) controlling the sand rate to be 38% -42% and controlling the water amount for mixing to be 165kg/m during the high-speed harvest;
3) the water-to-glue ratio is controlled to be 0.40-0.45;
4) the mixing amount of the fly ash is not more than 40% of the using amount of the cement;
5) controlling the slump of the concrete to the pouring working surface to be between 150mm +/-20 mm;
in the whole single floor concrete pouring process, the matching proportion is always ensured to be consistent, the difference of the concrete performance of each construction area is reduced, the difference of the shrinkage after the concrete is poured is reduced, and the flatness and levelness deviation caused by the shrinkage after the concrete is poured and leveled are controlled;
1) Determining premixed concrete with a manufacturer in advance, and negotiating to ensure that the concrete meets the supply of on-site continuous pouring;
2) the concrete transportation adopts a mixing truck with the transportation capacity meeting the current national standard, and has sun-proof and cold-proof facilities, thereby ensuring that the concrete is not separated and layered in the transportation process and meeting the requirements of site construction;
1) Setting construction joints in the vertical direction, combining the column network spacing and the plane shape, dividing the ground into a plurality of blocks according to a certain size by using the construction joints, wherein the maximum size of a single side of each block is not more than 40m multiplied by 40m, pouring adjacent blocks at intervals, pouring later-stage concrete after the concrete is poured at first and subjected to larger shrinkage deformation, so that the ground is connected and poured into a whole, and the pouring interval time of the adjacent blocks is more than 7 days, as shown in figure 1;
2) arranging a vibration bridge guide rail bracket system; the vibration bridge guide rail passes through the template through the galvanized screw 5 and is supported on the main keel 7 of the formwork support, so that the vertical rigidity of the guide rail is ensured; the template is used as a screw lateral support to ensure the lateral rigidity of the galvanized screw 5; the vibration bridge guide rail is an angle steel 2, a hole is formed in the angle steel, the angle steel is fixed with a galvanized screw 5 through a nut 3, the height of the nut 3 is adjusted to adjust the elevation of the guide rail, the elevation of the guide rail is uniformly adjusted through a precise level gauge, and the elevation is ensured through nut fastening;
a. paying-off and perforating template
Turning the position of a main keel 7 of the template support frame on a surface layer of the template, and popping out a central line; selecting a proper span of 6m according to the length of the vibration bridge, drilling 4 holes on the template with the elastic thread completed by a drilling machine, wherein the hole spacing is 1.5m according to the weight of the vibration bridge and the height of the bracket, and the size of the hole is selected according to the size of a galvanized screw 5 and is generally 2mm larger than the diameter of the screw; the position of the snapping line needs to be accurate, the position of the opening needs to correspond to the main keel 7, and the galvanized screw 5 can be supported on the elastic line at the later stage, as shown in figure 2, 1 is a concrete surface layer, 2 is an angle steel guide rail L30 x 4mm, 3 is a nut, 4 is a template opening phi 12-14 mm, 5 is a galvanized screw phi 12mm, 6 is a rubber pad, and 7 is an I-shaped steel I20 main keel;
b. screw installation
Calculating the length of a galvanized screw 5 to be 330-340 mm according to the standard height of 350mm from the main keel surface 7 to the floor surface, namely the height from the top surface of the keel 7 of the support frame to the concrete surface layer 1, and blanking; the screw 5 after blanking is supported on the main keel 7 of the die carrier through the die plate hole 4; in order to prevent the screw 5 from sliding on the main keel 7, one end of the screw is sleeved with a rubber pad 6, so that the friction effect of a bearing surface is increased, and the sliding of the screw in the installation process is prevented;
c. guide rail mounting
The guide rail 2 adopts L30-4 angle steel, a flange on one side of the angle steel is provided with holes according to the screw pitch of 1.5m, the hole position is the position of the center line of the flange close to the inner side, and the hole diameter is 14mm and is 2mm larger than the screw diameter of 12 mm; when the angle steel guide rail is installed, the vertical flange is close to one side of a concrete floor to be poured, so that the guide rail is convenient to dismantle at the later stage, and the disturbance to the concrete floor is reduced; two nuts 3 are added at the upper end of the screw 5, after the first nut is sleeved in the screw, an angle steel guide rail is installed, and then a second nut is installed;
d. adjustment of guide rail elevation
Through 3 adjustment angle steel guide rail 2's of nut on the screw rod 5 height, carry out the floor elevation location with accurate spirit level, allow deviation control in 1mm, the elevation reaches to tighten up second nut after the requirement, presss from both sides the guide rail tightly and stabilizes. After the guide rail is installed, a template strip is installed under the guide rail to serve as a side mold of the concrete terrace;
e. concrete pouring and bridge vibrating operation
The concrete is poured by pumping with a pump truck, the concrete characteristics are strictly detected before the concrete is pumped, and the requirement for pouring can be met after the concrete is poured. Manually flattening the poured concrete, wherein the flattening height is 1-2 cm higher than the guide rail surface;
after the concrete is initially flattened, starting a vibration bridge vibrator to vibrate the concrete below the vibration bridge, and simultaneously, the vibration bridge moves forwards under traction at the walking speed of 0.5 m/s; in the process of the vibration bridge walking, an operator adopts a rake to adjust the thickness of concrete in time and process the concrete scraped by the vibration bridge walking, so as to prevent the concrete from being too thick and toppling on the concrete surface processed by the vibration bridge;
f. guide rail removal and concrete face repair
After the vibration bridge is initially leveled, before concrete is initially set, in the process of manually removing the guide rail, the concrete pit left after the guide rail is removed and moved out must be removed, the guide rail is initially leveled by an iron trowel, and finally the concrete pit is integrally leveled by a 6m long leveling ruler;
g. concrete surface finishing and finishing
After the vibration bridge is primarily leveled, a long scraper is adopted to further polish the concrete surface; the long scraping ruler is made of a square pipe, and the scraping ruler is pushed forwards on the guide rail to be scraped flat by two persons in the operation process, and the guide rail is detached simultaneously. Removing the guide rail to cause unevenness of the concrete surface, and lightly scraping the concrete surface by using a long scraper; uniformly spreading a carborundum fabric with the thickness of 3mm before the concrete is initially set, and after the carborundum fabric is slightly wet, finishing and finishing by a disc finishing machine;
h. concrete terrace maintenance
Curing the concrete terrace, namely covering, watering and curing by adopting a thin film, wherein the curing time is 14 days;
i. construction of dividing joint
In order to reduce the large-area concrete shrinkage and the generation of temperature difference cracks, a processing method for cutting dividing joints is adopted in the later period, the dividing joints are cut according to a deepening drawing, and the principle does not exceed 6m multiplied by 6m dividing joints; and reserving the position of a joint of the column net for each warehouse-dividing construction joint, pulling the wire saw to be even after the form is removed, chiseling out a plurality of parts to ensure that the splicing joint is naturally straight after being dried and contracted, as shown in figure 3.
Claims (3)
1. A large-area ultra-flat concrete terrace flatness control device and a construction method are characterized in that: comprises that
Step 1, defining the requirements of raw materials: the cement is fly ash cement, and the aggregate is non-alkali active aggregate;
step 2, designing the mixing ratio: in the whole single floor concrete pouring process, the mixing proportion is kept consistent all the time, the difference of the concrete performance of each construction area is effectively reduced, the difference of the shrinkage after the concrete pouring is reduced, and a foundation is laid for the floor to achieve the ultrahigh required flatness and levelness;
step 3, preparation and transportation: the concrete is transported by adopting the premixed concrete, the transport capacity of the concrete is in accordance with the current national standard, and the concrete is provided with sun-proof and cold-proof facilities, so that the concrete is not separated and layered in the transportation process, and the requirements of site construction are met;
step 4, seamless construction of the concrete ground; setting a construction joint; setting construction joints in the vertical direction, combining the column network spacing and the plane shape, dividing the ground into a plurality of blocks according to a certain size by using the construction joints, pouring adjacent blocks at intervals, and pouring later-stage concrete after the concrete is poured at first and is subjected to larger shrinkage deformation so that the ground is connected and poured into a whole; arranging a vibration bridge guide rail bracket system; the vibration bridge guide rail penetrates through the template through a galvanized screw and is supported on a main keel of the formwork support, so that the vertical rigidity of the guide rail is ensured; the template is used as a screw rod side support to ensure the side rigidity of the screw rod, the vibration bridge guide rail is an angle steel, a hole is formed in the angle steel, the angle steel is fixed with the screw rod through a nut, the height of the nut is adjusted to adjust the elevation of the guide rail, the elevation of the guide rail is uniformly adjusted through a precise level gauge, and the elevation is ensured through the fastening of the nut;
in the above-mentioned steps, the step of,
a. paying off and opening the template;
according to the position of a main keel of the support frame and the position of a sub-bin, a screw position line is arranged on the template, a screw hole is arranged on the position line, the diameter of the hole of the template is 1-2 mm larger than that of the screw, so that the screw can freely pass through the hole, and the screw cannot be too loose due to too large size;
b. installing a screw;
according to the thickness of the floor slab and the distance between the main keel and the template, a screw rod with a proper length is selected, and the length of the screw rod is required to be ensured to be smaller than the flange height of one angle steel than the sum of the thickness of the floor slab and the distance between the main keel and the template.
2. The vibration bridge is prevented from walking on the guide rail if the vibration bridge is too long; before the screw penetrates through the template, a rubber pad needs to be sleeved at the bottom of the screw to prevent the screw from sliding on the main keel; a screw with a rubber pad passes through the template hole and falls on the main keel;
c. installing a guide rail;
the guide rail is made of angle steel, one flange of the angle steel is provided with a hole, the hole is close to the other flange, and the diameter of the hole is equal to the diameter of the screw;
after the screw is installed, a first nut is firstly mounted to serve as support of the angle steel guide rail and adjustment of the elevation of the guide rail, the angle steel guide rail penetrates through the screw and falls on the nut, and then a second nut is mounted to fix the angle steel guide rail;
d. adjusting the elevation of the guide rail;
the guide rail elevation adopts accurate surveyor's level to carry out the unwrapping wire, through the upper and lower rotating adjustment guide rail elevation of first nut, the elevation adjustment is accomplished the back, and the second nut of fastening is died first screw rod point guide rail elevation.
3. Adjusting the elevations of the screw point guide rails of the second, third and following screw points by analogy until the elevation of the whole guide rail is adjusted, and then adjusting the elevations of the guide rails of the second, third and following screw points; the plurality of guide rails form a floor elevation control surface, and after vibration bridge construction, ultrahigh required flatness and levelness of the floor are realized;
e. pouring concrete and vibrating a bridge;
pouring concrete among the guide rails, manually spreading the concrete, wherein the height of the spread concrete is about 10-20 mm higher than that of the guide rails, starting a vibration bridge vibrator after the concrete is primarily spread, vibrating the concrete under the vibration bridge, and simultaneously, the vibration bridge travels forwards under traction at the traveling speed of 0.5 m/s; in the process of the vibration bridge walking, an operator adopts a rake to adjust the thickness of concrete in time and process the concrete scraped by the vibration bridge walking, so as to prevent the concrete from being too thick and toppling on the concrete surface processed by the vibration bridge;
f. dismantling the guide rail and repairing the concrete surface;
after the vibration bridge is initially leveled, the guide rail is manually dismantled before the concrete is initially set, and the dismantled guide rail can be used for later floor construction; in the dismantling process, the concrete pit left after the guide rail is dismantled and moved out must be dismantled, taken and placed lightly, an iron trowel is used for primary leveling, and finally a long scraping ruler is used for overall leveling;
g. finishing and collecting the concrete surface;
after the vibration bridge is primarily leveled, a long scraper is adopted to further polish the concrete surface; the long scraping ruler is made of a square tube, and in the operation process, two persons push the scraping ruler forwards on the guide rail to scrape the long scraping ruler, and the guide rail is removed; removing the guide rail to cause unevenness of the concrete surface, and lightly scraping the concrete surface by using a long scraper; uniformly spreading a carborundum fabric with the thickness of 3mm before the concrete is initially set, and after the carborundum fabric is slightly wet, finishing and finishing by a disc finishing machine;
h. maintaining the concrete floor;
curing the concrete terrace, namely covering, watering and curing by adopting a thin film, wherein the curing time is 14 days;
i. constructing dividing joints;
in order to reduce the large-area concrete shrinkage and the generation of temperature difference cracks, a processing method of cutting dividing seams is adopted in the later period; dividing the joints according to a deepening drawing, wherein the division is not more than 6m multiplied by 6m in principle; and reserving the position of a joint of the column net for each warehouse-dividing construction joint, pulling and aligning the wire saw after the form is removed, and chiseling out a plurality of parts to ensure that the splicing joints are naturally straight after being dried and shrunk.
Priority Applications (1)
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