CN115749193A - Flatness and anti-cracking control construction method for super-large-area terrace - Google Patents

Abstract

The invention discloses a flatness and crack control construction method for a super-large-area terrace, which comprises the steps of base layer treatment, concrete cushion layer pouring, waterproof and waterproof protective layers, reinforcing steel bar net binding, side mold support and force transfer rods arrangement, concrete pouring and forming, terrace joint cutting, terrace surface layer construction, ground deformation joint construction and the like. The arrangement of the dividing joints eliminates the adverse effect of temperature stress caused by temperature change or concrete hardening shrinkage on the structure of the concrete terrace structure, and simultaneously avoids the uneven settlement of two adjacent plates after the steel bars are broken. Compared with the conventional manual paving and leveling construction, the construction idea can save labor force and construction time. The method has a strong demonstration effect on the construction of large-area terrace of large-scale industrial factory buildings.

Description

Flatness and anti-cracking control construction method for super-large-area terrace

Technical Field

The invention relates to the technical field of building construction, in particular to a flatness and anti-cracking control construction method for a terrace with an ultra-large area.

Background

Along with the wide application of large tracts of land concrete wear-resisting terrace in engineering such as industrial factory building, warehouse, large-scale parking area, supermarket store, logistics center. The construction method is also continuously developed: 1. the flatness control of the traditional large-area concrete wear-resistant terrace mostly adopts the method of making ash cakes to make cakes or simply supporting a formwork in a warehouse on a concrete base layer (structural layer). The traditional process can not meet the requirements of modern industrial plants and the like on the quality of the terrace, and the quality problems of obvious large-area cracking, corner missing, corner falling and the like often occur, so that the service function and the service life of a building are influenced, and unnecessary economic loss and credit loss are brought to enterprises. 2. At present, the common method is to adopt angle steel formwork branch bins for the cast concrete large-area wear-resistant terrace, the construction method can achieve the quality effect, but because a large amount of angle steel is adopted, certain cost and time waste exist in the installation and the removal of the angle steel.

Disclosure of Invention

Aiming at the defects of the prior art, the invention designs a flatness and anti-cracking control construction method for a super-large-area terrace, which is characterized by comprising the following steps of:

s1, base layer processing;

s2, pouring a concrete cushion layer: pouring a C15 concrete cushion layer with the thickness of 100mm and leveling at the same time of beating;

s3, setting a waterproof and waterproof protective layer: paving a self-adhesive polymer modified asphalt waterproof coiled material with the thickness of 3.0mm, turning up the self-adhesive polymer modified asphalt waterproof coiled material at the joint of the wall and the column by 300mm, and then pouring a C20 fine stone concrete protective layer with the thickness of 40 mm;

s4, binding of a steel bar mesh: according to the storehouse seam ink line position branch storehouse ligature bottom reinforcing bar net piece in the ground, the binding of bottom reinforcing bar net piece is accomplished the back and is filled up 25mm with the cushion, places the stirrup, and the stirrup reinforcing bar adopts C25 interval 1000mm, and overlap joint 100mm sets up, and wherein, the shop muscle order is: the lower net is laid in the short direction and then in the long direction, and the upper net is laid in the long direction and then in the short direction;

s5, arranging a side mold support and a dowel bar;

s6, pouring and forming concrete;

s7, floor slitting: after the compressive strength of the concrete reaches the specified strength, popping up an ink line on the concrete according to the arrangement of the bin dividing seams of the terrace, installing a guide rail guide frame, positioning a joint cutter, starting the joint cutter, draining water for lubrication, rotating a handle of a tool rest, slowly feeding, cutting by adopting a diamond saw blade, enabling the saw blade to reach the designed seam depth firstly, then screwing a screw, locking a screw rod and starting to travel, thereby forming a seam with the depth of 80mm and the width of 2-3 mm;

s8, constructing a floor surface layer;

and S9, constructing the ground deformation joint.

Preferably, S1, the base layer processing, includes the following steps:

s11, cleaning the construction waste and sundries in the site;

s12, ramming plain soil layer by layer on a foundation pit of a plant foundation, wherein the thickness of each layer is 200-300 mm, the compaction coefficient is not less than 0 and 95, and a cutting ring test is performed on each layer;

s13, the broken stones are tamped into the soil, after the large-area compaction is successful, a cushion layer is constructed, and the tamping machine is used for tamping the part which cannot be compacted locally.

Preferably, S5, the step of arranging the side mold support and the dowel bar comprises the following steps:

s51, positioning and paying-off: popping up concrete ground control datum lines on peripheral frame columns according to elevation control points, arranging elevation control fixed points and pull control lines at column bases and expansion joints at the edges of the sub-bins at intervals of 6m, adjusting angle iron epithelium according to the control lines, and controlling the ground flatness of the positions by scraping bars, wherein the elevation error is strictly controlled to be +/-1.0 mm;

s52, branch side die: setting template positioning piles according to the elevation datum points and dividing bin seam positioning lines, positioning the outer sides of the positioning piles according to 20mm of outward expansion of dividing seams, positioning the positioning piles among the positioning piles at intervals of 4m, and controlling the position and the elevation of the template by adopting a level gauge; the dowel bar steel bars are inserted into reserved PVC pipes on the side mold of the first pouring sub-bin block, the dowel bar steel bars are pulled out when the side mold is detached, and the dowel bar steel bars are inserted into the PVC pipes for pouring when the adjacent sub-bins are filled;

s53, template dismantling: the template is dismantled to ensure that the concrete structure is not deformed and the edges and corners are complete, and the template and the concrete body cannot be knocked forcefully during the template dismantling according to the sequence of dismantling firstly after and then dismantling firstly after support.

Preferably, S6, the concrete pouring and forming comprise the following steps:

s61, preparing before concrete pouring;

s62, carrying out size lifting and polishing by a polisher: pouring concrete, adopting a troweling machine to start surface plastering work to uniformly and repeatedly smear and compact when the concrete is pressed by fingers without finger marks or only slight marks are left after treading by feet, plastering for the next time after the water on the surface of the concrete is evaporated after each plastering is finished, performing grout supplementing and troweling immediately when a concave pond or a rough surface appears on the local surface, and then performing mechanical plastering;

s63, surface layer construction: wear-resistant aggregate is used as a surface layer, 2/3 of the wear-resistant aggregate with specified dosage is uniformly spread on the surface of the concrete immediately after the slurry head is roughly smeared and prepared on the concrete, and a troweling machine is used for polishing after the moisture absorbed by the material meets the requirement; after the hardening meets the requirement, spreading the rest 1/3 of wear-resistant aggregate material, and after the moisture absorbed by the material meets the requirement, polishing again by using a polisher;

s64, finishing and polishing the surface of the concrete before final setting;

s65, concrete curing: after finishing the concrete polishing, the surface of the concrete is not allowed to move heavy objects on the concrete terrace, the concrete is always kept in a wet maintenance state, a plastic film or a green cotton quilt is used for covering, the concrete is isolated from the outside, and people are strictly prohibited before the strength of the concrete on the surface layer does not reach the specified strength.

Preferably, S61, the preparation work before concrete pouring includes the following steps:

s611, accurately calibrating the level control point: after factory ground level control points provided by an original surveying and mapping unit are compared and measured by an optical level gauge, respectively introducing peripheral construction control points, introducing a reference level elevation onto a factory building frame column through the construction control points, repeatedly correcting after fixing points, ensuring that the error between main control points of the level is within 4mm, establishing auxiliary level control points according to the division of construction sections, ensuring that the error between the auxiliary level control points and the main level points is within 1mm, and ensuring the accuracy of the level control points;

s612, adopting a laser leveling machine to track and check to ensure the flatness: the laser transmitter independently arranges a leveling point on the calibration frame column, and the ground level always takes a plane formed by rotating laser beams transmitted by the laser transmitter as a control plane to control the laser temper mill;

s613, determining the concrete pouring sequence and controlling the slump: pouring the plates arranged in an even sequence at first and the plates arranged in an odd sequence at later, wherein the time interval is not less than 3 days, and the slump is controlled to be 180 +/-20 mm;

s614, adjusting the flatness of the periphery of the equipment foundation, the steel column side and the periphery of the embedded bolt: inserting vibrating rods into the periphery of an equipment foundation, the steel column side and the periphery of the embedded bolt for vibrating, and scraping by using a scraping ruler until the surface layer is free of stones and steel fibers.

Preferably, S64, the surface finishing and polishing before the final setting of the concrete comprises the following steps:

s641, floating time control: when the concrete is leveled and initially set, the moisture on the surface of the concrete is evaporated, plastering is started after people step on the concrete to avoid sinking, and plastering work must be controlled to be finished before the concrete is finally set;

s642, coarse wiping: when the surface moisture of the concrete is evaporated and people step on the concrete to avoid sinking, the disc is adopted to evenly and repeatedly perform smoothing and compacting, after finishing once smoothing, the next smoothing is performed after the surface moisture of the concrete is evaporated, and meanwhile, a scraping ruler is used for further smoothing;

s643, fine wiping: firstly, polishing by using an electric polisher with the weight of more than 500kg, then polishing by using a disc and then polishing by using a blade, wherein the blade is required to be further inclined during each polishing;

s644, final erasing: when the concrete surface is basically solidified and only slight traces are removed by stepping on, the leveling and smooth conditions are carefully checked by a guiding rule, and the parts which do not meet the requirements are further polished and smoothed by a smoothing machine.

Preferably, S8, floor surface construction, including the following step:

s81, constructing an epoxy color sand wear-resistant layer;

and S82, constructing an epoxy mortar ground layer.

Preferably, S81, the construction of the epoxy colored sand wear-resistant layer comprises the following steps:

s811, fully stirring the materials according to the mixing proportion, repeatedly carrying out blade coating by using a blade coating process, so that the epoxy high-permeability primer is sealed and permeates into the concrete base layer, and ensuring that the epoxy color sand terrace is combined with the concrete;

s812, paving a 5.5mm epoxy colored sand layer by using a paver, compacting and troweling corner parts, compacting and troweling the edge parts by using a troweling machine in a large area to flatten the surface so as to form an integral seamless epoxy colored sand layer;

s813, construction of a transparent high-strength wear-resistant finish paint layer: and (3) finely polishing the color sand layer by using a polisher, cleaning and removing dust to obtain a good and fine color sand appearance effect, and finally performing roll coating on the transparent high-strength polyurethane matte wear-resistant finish paint.

Preferably, the construction of the epoxy mortar ground layer comprises the following steps:

s821, preprocessing: mechanically polishing and absorbing dust on the poured steel fiber concrete ground to expose structural micropores on the concrete surface, scrubbing the partially greasy or damp ground by using special cleaning solution containing alcohol, ester, surfactant and the like, then performing well-shaped pattern sawing treatment by using a sawing machine, and filling epoxy mortar;

s822, coating base oil: coating the base surface of the treated clean cement with a primer by using a glue scraper, wherein the coating is performed in two times of longitudinal and transverse directions, and the full coating and uniform thickness are required;

s823, coating a color mortar layer: mixing epoxy resin and a curing agent according to the proportion of 1:0.4, then adding color stone sand with the weight 3.5 times of that of the epoxy resin, and stirring for about 2-3 min to form epoxy color quartz mortar; pouring the mortar on the cement base surface coated with the base oil, uniformly coating the epoxy mortar by using the toothed iron palladium, and simultaneously controlling the thickness of a mortar layer; firstly, carrying out compaction treatment by using a toothed ash spoon and then using a plain-end ash spoon; rolling the epoxy colored sand layer to eliminate air bubbles and further compact the mortar layer, or compacting and finishing the epoxy colored sand layer by using a finishing machine; waiting for the mortar layer to be solidified;

s824, surface shading: and spraying or scraping a layer of epoxy resin surface oil on the surface of the cured epoxy colored sand layer to ensure that the surface is smooth and clean, and the surface scraping requirement is fine and uniform.

Preferably, S9, the construction of the ground deformation joint comprises the following steps:

s91, reserving 8-10mm construction joints during ground pouring: nailing a foam plate with the thickness of 3-5mm on the concrete side surface of the terrace by using cement nails, wherein the distance between the foam plate and the concrete side surface of the terrace is 40mm, and embedding an aluminum alloy strip after the concrete is stabilized;

and S92, after the construction of the ground surface layer is finished, the installation of the shaping deformation joint is carried out.

Compared with the closest prior art, the invention has the beneficial effects that:

the invention adopts the construction idea of a skip method and a false joint, plates with even number are poured in the pouring sequence according to the sequence of pouring first, plates with odd number are poured in the pouring sequence, and the lattice joints are cut after the ground construction is finished. The arrangement of the dividing joints eliminates the adverse effect of temperature stress caused by temperature change or concrete hardening shrinkage on the structure of the concrete terrace structure, and simultaneously avoids the uneven settlement of two adjacent plates after the steel bars are broken. Compared with the conventional manual paving and leveling construction, the construction idea can save labor force and construction time. The method has a strong demonstration effect on the construction of large-area terrace of large-scale industrial factory buildings, can be applied to industrial buildings, and has strong application capability in the fields of large-scale commercial squares and public buildings.

Drawings

Fig. 1 is a flow chart of the flatness and crack control construction method for the super-large area terrace of the invention.

FIG. 2 is a schematic view of the stirrup of the present invention.

Fig. 3 is a perspective view of a dowel bar of the present invention.

FIG. 4 is a schematic view of a dowel of the present invention.

Fig. 5 is a construction view of the form and dowel of the present invention.

FIG. 6 is a graphic representation of the plateau parting line of the present invention.

Fig. 7 is a large illustration of the floor slitting of the present invention.

FIG. 8 is a diagram of the interface between the present invention and structures such as foundations, posts, and walls.

Reference numerals are as follows:

1-dowel bar, 2-construction joint, 3-sleeve, 4-template, 5-large cabin with through joint, 6-parting joint and cutting joint, 7-polyurethane sealant and 8-foam plate.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

Example 1

As shown in fig. 1 to 8, the method for leveling a floor with an oversized area and controlling cracking is described below by taking a technical transformation project combined workshop as an example, and the construction method is suitable for leveling a floor with an oversized area and controlling cracking of an industrial factory building, a parking lot, a large supermarket, a logistics center and the like, wherein the thickness of the floor is 200-3000 mm, and the area of the floor is 1200-1800 square meters. Specifically, the construction method for controlling flatness and crack prevention of the super-large-area terrace of the embodiment comprises the following steps:

s1, base layer treatment:

s11, cleaning a natural field, and cleaning the construction waste and sundries in the field.

S12, carrying out plain soil layer-by-layer tamping on foundation pits of the plant foundation, wherein the thickness of each layer is 200-300 mm, the compaction coefficient is not less than 0 and 95, and a cutting ring test is carried out on each layer.

S13, the broken stones are tamped into the soil, after the large-area compaction is successful, a cushion layer is constructed, and tamping is carried out on the part which cannot be compacted locally by a tamping machine. This is to avoid the cast underlayment breaking under the shock loading.

S2, pouring a concrete cushion layer: and pouring a C15 concrete cushion layer with the thickness of 100mm and leveling while beating.

S3, setting a waterproof and waterproof protective layer: and paving a self-adhesive polymer modified asphalt waterproof coiled material with the thickness of 3.0mm, turning up the self-adhesive polymer modified asphalt waterproof coiled material at the joint of the wall and the column by 300mm, and then pouring a C20 fine aggregate concrete protective layer with the thickness of 40 mm.

S4, binding the reinforcing mesh sheet: according to the ground bin dividing joint ink line position bin dividing ligature bottom reinforcing bar net piece, the bottom reinforcing bar net piece ligature is accomplished the back and is filled up 25mm with the cushion, places the stirrup, and the stirrup reinforcing bar adopts C25 interval 1000mm, and overlap joint 100mm sets up, and wherein, the shop muscle order is: the lower net is laid in the short direction first and then in the long direction, and the upper net is laid in the long direction first and then in the short direction. As shown in fig. 2, L:1000mm; b, 600mm; h, the thickness of the terrace concrete, the upper and lower protective layers and the diameters of the upper and lower iron.

The reinforcing mesh of the bidirectional main reinforcement needs to be crossed with all the reinforcing bars and firmly fastened at the crossed points. The steel wires of adjacent binding points are buckled into a splayed shape so as to prevent the reinforcing mesh from being inclined and deformed. The thickness of the upper layer steel mesh protective layer is 25mm, and the thickness of the lower layer steel mesh protective layer is 25mm. The overlap length of the reinforcing steel bars is 35d.

S5, arranging a side mold support and a dowel bar: s51, positioning and paying off: the positioning and paying-off are mainly characterized in that the elevation and the position of the channel steel and the (channel steel + angle steel) side die are controlled, the designed thickness of the terrace concrete is 250mm, the height of the 300mm side die is 220mm, the height of the 270mm and the height of the 30mm are used as elevation control allowance. Popping up concrete ground control datum lines on the peripheral frame columns by measurement personnel according to the elevation control points; an elevation control fixed point and a pull control line are arranged at the expansion joint of the column foot and the edge of the sub-bin to control the ground flatness of the position through a scraping bar. And (3) measuring the surface elevation of the angle iron (namely the surface elevation of the concrete), giving a point every 6m, giving the point to a vertical steel bar with phi 14, which is firmly welded, enabling the vertical steel bar to be close to a template, hanging a through line on the vertical steel bar, and adjusting the angle iron epithelium according to the through line. The lower gap of the template is filled with cement mortar and a dowel bar is additionally arranged. Before concrete is poured, the levelness of the concrete is measured by a horizontal ruler, the elevation of the concrete is measured at intervals of 2.0m, and the error of the elevation is strictly controlled to be +/-1.0 mm.

S52, branch side die: and (5) pouring the waterproof protective layer to finish the rear side die. And arranging a cast-in-advance part of the template positioning pile (adopting a phi 16 steel bar) according to the elevation reference point and the dividing bin seam positioning line, inserting the steel bar with the length of 35cm into the protective layer, and ensuring that the insertion depth does not exceed 4cm. The positioning pile is characterized in that two ends of the positioning pile are firstly positioned, the positioning pile is positioned at the outer side of the positioning pile according to the 2cm outward expansion of dividing joints, two ends of the positioning pile are pulled to form positioning piles in the positioning pile at intervals of 4m, a leveling instrument is adopted to exceed the elevation points of the terrace on the positioning pile, and each elevation point is tied by a thin wire and pulled through to control the position and elevation of a template. The splicing position of the templates must be ensured to be flat and straight. And after the concrete strength reaches the design requirement (not less than 7 days), pouring the second concrete by using the concrete ground surface poured for the first time as a side mold for pouring the concrete for the second time. .

S53, template dismantling: terrace demold can guarantee that concrete structure is indeformable, and the edges and corners are complete. And the module can be removed through the project department and the supervision consent. When the mold is disassembled, the mold should be disassembled in the order of disassembling the mold after the mold is disassembled and disassembling the mold after the mold is disassembled. The template and the concrete body cannot be knocked hard when the template is detached.

S54, template construction technology quality assurance measures: before the template is installed, a release agent is coated, and the surface of the template is strictly forbidden to be coated with waste engine oil; when the formwork is installed, besides ensuring the correct plane position, the verticality error of the formwork is ensured to be within an allowable range. And special personnel are dispatched to the installation site to correct the position, the verticality, the elevation and the embedded part of the template at any time, so that the absolute accuracy of the template is ensured. When the steel mould is corrected, the two ends are corrected firstly, then the middle is corrected, the template reaches the designated elevation by adjusting the wood wedge, and after the correction, the lower part of the steel mould is fixed by adopting dry and hard mortar as a leveling layer (the support wood wedge is removed after the fixing is firm), so that the template is prevented from leaking the mortar.

S6, pouring and forming concrete:

s61, preparation work before concrete pouring: before concrete is poured, preparation work is fully prepared to ensure continuous pouring.

S611, accurately calibrating the level control point: after factory ground level control points provided by an original surveying and mapping unit are measured and calculated through an optical level gauge in a contrast mode, peripheral construction control points are respectively introduced, reference level elevations are introduced into a factory building frame column through the construction control points, repeated correction is conducted after fixed points, errors among main control points of the levels are guaranteed to be within 4mm, meanwhile, auxiliary level control points are established according to division of construction sections, errors between the auxiliary level control points and the main level points are guaranteed to be within 1mm, and accuracy of the level control points is guaranteed.

S612, adopting a laser leveling machine to track and check to ensure the flatness: the laser transmitter independently arranges the leveling point on the calibration frame post, and the ground elevation always uses the plane that the rotatory laser beam that laser transmitter sent constitutes as the control surface, controls the laser levelling machine. Leveling technical principle of a laser leveling machine: the laser leveling method is adopted, a control line is not required to be pulled, the elevation is controlled in real time by a computer, the control frequency reaches 10 times per second, and the ground elevation can be accurately controlled even if high-speed construction is carried out. Once the initialization is completed, as long as the laser transmitter is not disturbed, no matter where the laser leveling machine moves, the level of the ground after the paving and the grouting on the whole can be ensured not to be influenced. The laser leveling machine completes leveling work while automatically leveling by means of a hydraulically driven leveling head and a laser system and a computer control system. The leveling head is provided with a scraper, a stirring screw, a vibrator and a leveling beam which are integrally designed, so that the concrete spreading and leveling work is integrated, and the vibration and leveling are finished at one time. Thereby ensuring the flatness and elevation of the concrete ground.

S613, determining the concrete pouring sequence and controlling the slump: the pouring sequence is that plates with even number in sequence are poured firstly (need to be installed in a mold), plates with odd number in sequence are poured later (need not be installed in a mold), the time interval is not less than 3 days, the area of each block is not more than 1200 square meters, and the slump constant is controlled within 180 +/-20 mm.

S614, flatness adjustment of the periphery of the equipment foundation, the steel column side and the periphery of the embedded bolt: firstly, inserting vibrating rods into the periphery of the equipment foundation, the steel column side and the periphery of the embedded bolt for vibrating, and scraping by using a scraping ruler until the surface layer is free of stones and steel fibers.

S62, carrying out size lifting and polishing by a polisher:

and S621, when the concrete is pressed by fingers and has no finger marks or only slight marks are left after being stepped on by feet, a troweling machine is adopted to start surface plastering work and evenly and repeatedly plaster and compact the concrete, and after finishing plastering once, the concrete is plastered for the next time after the water on the surface of the concrete is evaporated.

And S622, if a local surface has a concave pond or is not flat, manually patching and trowelling the local surface immediately, and then mechanically trowelling the local surface.

And S623, after the whole surface layer is leveled and compacted, after primary pulp is adjusted, finishing rough plastering, wherein the rough plastering work is controlled to be finished shortly after the initial setting of concrete.

S63, surface layer construction: the wear-resistant aggregate is used as a surface layer, 2/3 of the wear-resistant aggregate with specified dosage is uniformly spread on the surface of the concrete immediately after the concrete is roughly smeared and prepared out of a slurry head, and a trowelling machine is used for polishing after the moisture absorbed by the material meets the requirement; and after the materials are hardened to meet the requirement, spreading the rest 1/3 of wear-resistant aggregate materials, and after the moisture absorbed by the materials meets the requirement, polishing the materials again by using a troweling machine.

S64, surface finishing and polishing before final setting of concrete:

s641, floating time control: the time of rendering determines the quality of the rendering. The early stage of the process can cause high and low flow lines on the surface of the concrete. The flatness accuracy is affected; if the time is too late, the paint is difficult to apply and is not easy to be smeared. Sometimes, the final setting time of the concrete is reached, so that the strength of the concrete is influenced. Preferably, the initial setting is controlled to be started after the concrete is manually plastered and leveled, the water on the surface of the concrete is evaporated, and the concrete is plastered after a person steps on the concrete to basically prevent the concrete from sinking: the plastering work must be finished before the concrete is finally set.

S642, coarse wiping: the concrete is initially set, about 3 hours to 4 hours after pouring, the surface moisture of the concrete is evaporated, when people step on the concrete and can not sink, the disc is adopted to uniformly and repeatedly (the rough wiping times are determined according to the wiping condition) to perform smoothing and compacting, and after each wiping is finished, the next wiping is performed after the surface moisture of the concrete is evaporated. And further scraping and leveling by using a 3.5-5.5 Ill scraping rule. During rough wiping, the overall floating compaction of the area and the primary pulp adjustment are taken as main targets. When the grid shoe is roughly smeared, an operator wears the grid shoe by feet.

S643, fine wiping: and (3) before the concrete is finally set, approximately pouring the concrete for 8 hours, and polishing by using a double-disc polishing machine to compact the concrete and improve the wear resistance of the surface of the concrete. Polishing with an electric polisher with a weight of 500kg or more; grinding by using a disc and then polishing by using a blade; the blade should be further inclined each time it is sharpened. Increase the friction for the concrete surface, polish and receive the gloss, make the terrace gloss degree even.

S644, final erasing: approximately 1 hour before the final setting of the concrete, the surface was substantially set, and very slight marks were removed by treading. Quality testing personnel enter the field and carefully check the leveling and smooth conditions by using a guiding rule, and for the parts which do not meet the requirements, further calendaring and smearing by using a smearing machine.

S65, concrete curing: after finishing the concrete polishing, the surface of the concrete is not allowed to move heavy objects on the concrete terrace, the concrete is always kept in a wet maintenance state, a plastic film or a green cotton quilt is used for covering, the concrete is isolated from the outside, and people are strictly prohibited before the strength of the concrete on the surface layer does not reach the specified strength.

S7, floor slitting: in order to overcome the temperature change and the crack generated by the water loss of the concrete, a cutting machine needs to be used for cutting a seam on the poured concrete ground in a direction vertical to the pouring direction of the concrete. Premature slitting can loosen stones and damage the edges: the seam is difficult to cut too late, and the two ends of the seam are easy to crack irregularly. The joint cutting time is usually 3 days after curing, and when the compressive strength of the concrete reaches 6-10 MPa. The specific operation method comprises the following steps: according to the method, according to the arrangement of bin dividing seams of a terrace on the concrete, an ink line is popped up, a guide rail guide frame is installed, a joint cutter is positioned, the joint cutter is started, water is drained for lubrication, a handle of a tool rest is rotated, the cutting is slowly fed, a diamond saw blade is used for cutting joints, the saw blade firstly reaches the designed seam depth, then a screw is screwed, a screw rod is locked, and the diamond saw blade starts to travel, so that a seam with the depth of 80mm and the width of 2-3mm is formed.

S8, floor surface layer construction:

s81, constructing an epoxy color sand wear-resistant layer:

s811, fully stirring the materials according to the mixing proportion, and repeatedly carrying out blade coating by using a blade coating process. The epoxy high-permeability primer is sealed and permeates into the concrete base layer, so that the epoxy color sand terrace is ensured to be combined with the concrete, and the durability of the adhesive force is improved.

S812, paving a 5.5mm epoxy colored sand layer by using a paver, compacting and troweling the corner parts for construction, compacting and troweling the edge parts by using a troweling machine in a large area to enable the surface to be flat, and forming the integral seamless epoxy colored sand layer.

S813, construction of a transparent high-strength wear-resistant finish paint layer: and (3) finely polishing the color sand layer by using a polisher, cleaning and removing dust to obtain a good and fine color sand apparent effect, and finally rolling and coating transparent high-strength polyurethane matte wear-resistant finish paint.

S82, construction of an epoxy mortar ground layer:

s821, preprocessing: and mechanically polishing and absorbing dust on the poured steel fiber concrete ground to expose structural micropores on the surface of the concrete, so that epoxy resin can penetrate into the concrete more deeply, and the bonding strength of the epoxy ground layer and the cement base layer is ensured. The method comprises the steps of scrubbing a part of greasy dirt or damp ground by using special cleaning solution containing alcohol, ester, surfactant and the like, then performing cross-shaped pattern sawing treatment by using a sawing machine, and filling epoxy mortar to ensure the bonding strength.

S822, coating base oil: the primer (epoxy resin: curing agent =1: 0.4) was applied by squeegee to the treated clean cement base surface, and the brushing was performed in two vertical and horizontal directions, requiring full coating and uniform thickness to avoid surface hollowing.

S823, coating of a color mortar layer: uniformly stirring the epoxy resin and the curing agent according to the ratio (mass ratio) of 1 to 0.4 for about 3min, and then adding color stone sand with the weight being 3.5 times that of the epoxy resin and stirring for about 2 to 3min to form epoxy color quartz mortar; pouring the mortar on the cement base surface coated with the base oil, uniformly coating the epoxy mortar by using iron palladium (with the thickness of 3 mm) with teeth, and simultaneously controlling the thickness of a mortar layer; a constructor wears a spiked shoe to perform compaction treatment on the mortar layer by using a toothed ash spoon and then a plain-end ash spoon; rolling the epoxy colored sand layer to eliminate air bubbles and further compact the mortar layer, or compacting and finishing the epoxy colored sand layer by using an inlet finishing machine; the mortar layer is solidified for about 8 hours.

S824, surface shading: and spraying or scraping a layer of epoxy resin surface oil on the surface of the cured epoxy colored sand layer to ensure that the surface is smooth and clean, and the surface scraping requirement is fine and uniform.

S9, construction of ground deformation joints:

s91, reserving a construction joint of 8-10mm during ground pouring: and (3) nailing the foam board with the thickness of 3-5mm to the concrete side surface of the terrace by 40mm from the surface of the terrace by using cement nails, and embedding the aluminum alloy strip after the concrete is stabilized.

And S92, after the construction of the ground surface layer is finished, installing the shaping deformation joint.

The invention adopts a skip method and a parting joint construction technology: the construction is carried out by adopting a skip method, the pouring sequence is to pour plates with even number in the arrangement sequence (to be die-filled) and pour plates with odd number in the sequence (not to be die-filled) according to the first pouring sequence, the time interval is not less than 3d, and the area of each warehouse and each block is not more than 1200 square meters. The upper part of the reinforcing steel bar at the position of the sub-bin seam is broken so as to avoid uneven settlement of two adjacent plates after the reinforcing steel bar is broken. And dividing the lattice joints after the ground construction is finished, wherein the spacing between the lattice joints is not more than 9m at most. The thickness of the floor protective layer is 25-30mm. Considering the ground construction process and the elegant appearance after molding, the division seam setting principle is as follows: all longitudinal and transverse dividing joints adopt a post-cutting method, the upper reinforcing steel bars at the dividing joints are cut off, the width of the joints is 2-3mm, and the depth of the joints is 80mm. The joint is usually cut after 3d, and the temperature and humidity in the field at that time are taken into consideration, and appropriate adjustment can be made if necessary. The arrangement of the dividing seams eliminates the adverse effect of temperature stress caused by temperature change or concrete hardening shrinkage on the construction of the concrete terrace structure.

Example 2

The invention also adopts an elevation control method: this engineering large tracts of land terrace construction surface roughness control mainly controls with laser leveling machine. Before concrete is poured, leveling work is carried out after the laser leveling machine is debugged, and a concrete ground control reference line is popped out of the peripheral frame column in order to avoid the machine from being scratched with the wall column and keep a distance of 50cm from the side edge of the wall column when the laser leveling machine is leveled; popping up ground elevation reference lines at the wall side and the frame column side, and controlling the ground flatness of the position by adopting a scraping bar; secondly, arranging a control elevation line at the longitudinal and transverse seams of each sub-bin seam, and drawing an iron wire as an elevation control line on the basis of the elevation control elevation line which is 80mm higher than the concrete floor (the height of a scraping bar is 80 mm). And after the elevation control is finished, a technician checks repeatedly, the error is controlled to be +/-2 mm, and the steel wire is adopted to tighten and control the elevation of the concrete, so that the whole process is run through.

Example 3

In addition, the invention also uses a crack control method, which comprises the following specific steps:

a. the middle part of a concrete slab at the position of a compartment separation seam is provided with a dowel bar with the length of phi 16@1000mm and the length of 500mm, one side of the concrete slab is poured firstly, a plastic sleeve is added, and the other side of the concrete slab is poured later, so that the sleeve is not added, and the horizontal free movement of the dowel bar is ensured.

b. In order to prevent the internal corner concrete crack from being generated at the joint of the ground and the column at the joints of structures such as equipment foundations, columns, walls and the like, a foam plate with the thickness of 5-10mm is paved and bonded at the joint of the parts before the floor construction, and polyurethane sealant is filled at the upper sealing part for sealing.

c. After finishing polishing the surface layer of the steel fiber concrete after pouring, covering and maintaining the surface layer by using a plastic film and a green cotton quilt, keeping the surface layer wet all the time, isolating the concrete from the outside to prevent pollution, and strictly forbidding people to get in the process.

d. In order to prevent the concrete from generating surface cracks, joint cutting is carried out after the concrete is cured for 3d to reach certain strength.

The present invention has been described in terms of the preferred embodiment, and it is not intended to be limited to the embodiment. Any modification, equivalent replacement, improvement or the like made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention as filed.

Claims (10)

1. The flatness and anti-cracking control construction method for the super-large-area terrace is characterized by comprising the following steps of:

s1, base layer processing;

s2, pouring a concrete cushion layer;

s3, arranging a waterproof and waterproof protective layer;

s4, binding a steel bar mesh;

s5, arranging a side mold support and a dowel bar;

s6, pouring and forming concrete, wherein the concrete is poured in sequence according to the plate with an even number in the first pouring arrangement sequence and the plate with an odd number in the second pouring arrangement sequence, and the time interval is not less than 3d;

s7, cutting the terrace: when the compressive strength of the concrete reaches the specified strength, popping up ink lines on the concrete according to the position of the bin dividing joint of the terrace, arranging a guide rail guide frame, and dividing the lattice joints by using a joint cutter, wherein all longitudinal and transverse lattice joints adopt a post-cutting method, the upper steel bars at the lattice joints are cut off, and the width and the depth of the slit are 2-3mm and 80mm;

s8, constructing a floor surface layer;

and S9, constructing the ground deformation joint.

2. The flatness and crack control construction method for the super-large area terrace according to claim 1, wherein in the step S1, the base layer treatment comprises the following steps:

s11, cleaning the construction waste and sundries in the site;

s12, ramming plain soil layer by layer on a foundation pit of a plant foundation, wherein the thickness of each layer is 200-300 mm, the compaction coefficient is not less than 0 and 95, and a cutting ring test is performed on each layer;

s13, the broken stones are tamped into the soil, after the large-area compaction is successful, a cushion layer is constructed, and the tamping machine is used for tamping the part which cannot be compacted locally.

3. The super-large area terrace flatness and crack control construction method according to claim 1, wherein in the step S2, the pouring of the concrete cushion layer comprises: pouring a C15 concrete cushion layer with the thickness of 100mm and leveling at any time;

in step S3, the step of setting a waterproof and waterproof protective layer comprises the following steps: and paving a self-adhesive polymer modified asphalt waterproof coiled material with the thickness of 3.0mm, turning up the self-adhesive polymer modified asphalt waterproof coiled material at the joint of the wall and the column by 300mm, and then pouring a C20 fine aggregate concrete protective layer with the thickness of 40 mm.

4. The flatness and crack control construction method for the super-large area terrace according to claim 1, wherein in the step S4, the steel bar mesh binding comprises the following steps: according to the storehouse seam ink line position branch storehouse ligature bottom reinforcing bar net piece in the ground, the binding of bottom reinforcing bar net piece is accomplished the back and is filled up 25mm with the cushion, places the stirrup, and the stirrup reinforcing bar adopts C25 interval 1000mm, and overlap joint 100mm sets up, and wherein, the shop muscle order is: the lower net is laid in the short direction first and then in the long direction, and the upper net is laid in the long direction first and then in the short direction.

5. The flatness and anti-cracking control construction method for the super-large area terrace according to claim 1, wherein S5, the step of arranging the side mold support and the dowel bar comprises the following steps:

s51, positioning and paying-off: popping up concrete ground control datum lines on peripheral frame columns according to elevation control points, arranging elevation control fixed points and pull control lines at column bases and expansion joints at the edges of the sub-bins at intervals of 6m, adjusting angle iron epithelium according to the control lines, and controlling the ground flatness of the positions through scraping bars, wherein the elevation error is controlled to be +/-1.0 mm;

s52, branch side die: setting template positioning piles according to the elevation datum points and dividing bin seam positioning lines, positioning the outer sides of the positioning piles according to 20mm of outward expansion of dividing seams, positioning the positioning piles among the positioning piles at intervals of 4m, and controlling the position and the elevation of the template by adopting a level gauge; the dowel bar steel bars are inserted into reserved PVC pipes on the side mold of the first pouring sub-bin block, the dowel bar steel bars are pulled out when the side mold is detached, and the dowel bar steel bars are inserted into the PVC pipes for pouring when the adjacent sub-bins are filled;

s53, template dismantling: the template is dismantled according to the order of dismantling earlier after, first branch and then dismantle.

6. The super-large area floor flatness and crack control construction method according to claim 1, characterized in that S6, concrete pouring and forming, includes the following steps:

s61, preparing before concrete pouring;

s62, sizing and finishing by a finishing machine;

s63, surface layer construction: the wear-resistant aggregate is used as a surface layer, 2/3 of the wear-resistant aggregate with specified dosage is uniformly scattered on the surface of the concrete immediately after the concrete is roughly smeared and adjusted to form a slurry head, and a troweling machine is used for polishing after the strength of the material meets the requirement; after the hardening meets the requirement, scattering the rest 1/3 of the wear-resistant aggregate material, and after the strength of the material meets the requirement, polishing again by using a troweling machine;

s64, surface finishing and polishing before final setting of concrete;

s65, concrete curing.

7. The super-large area floor flatness and anti-cracking control construction method according to claim 6, wherein the preparation work before S61 and concrete pouring comprises the following steps:

s611, accurately calibrating the level control point: after the level control points of the field of the factory are compared and measured by an optical level gauge, respectively introducing peripheral construction control points, introducing a reference level elevation onto a frame column of a factory building through the construction control points, repeatedly correcting after fixing the point, ensuring that the error between main control points of the level is within 4mm, establishing auxiliary level control points according to the division of construction sections, ensuring that the error between the auxiliary level control points and the main level points is within 1mm, and ensuring the accuracy of the level control points;

s612, adopting a laser leveling machine to track and check to ensure the flatness: the laser transmitter independently arranges a calibration frame column upper level point, and the ground elevation always takes a plane formed by rotating laser beams transmitted by the laser transmitter as a control plane to control the laser temper mill;

s613, determining the concrete pouring sequence, and controlling the slump: wherein, the slump is controlled to be 180 +/-20 mm;

s614, adjusting the flatness of the periphery of the equipment foundation, the steel column side and the periphery of the embedded bolt: firstly, inserting vibrating rods into the periphery of the equipment foundation, the steel column side and the periphery of the embedded bolt for vibrating, and scraping by using a scraping ruler until the surface layer is free of stones and steel fibers.

8. The ultra-large area terrace flatness and anti-cracking control construction method according to claim 1, wherein S8, the terrace surface layer construction comprises the following steps:

s81, constructing an epoxy colored sand wear-resistant layer;

s82, constructing an epoxy mortar ground layer;

wherein, S81, the construction of epoxy colored sand wearing layer includes the following steps:

s811, fully stirring the materials according to the mixing proportion, repeatedly scraping by using a scraping process to seal the epoxy high-permeability primer and permeate the epoxy high-permeability primer into the concrete base layer, and ensuring the combination of the epoxy color sand terrace and the concrete;

s812, paving a 5.5mm epoxy colored sand layer by using a paver, compacting and troweling corner parts, compacting and troweling the edge parts by using a troweling machine in a large area to flatten the surface so as to form an integral seamless epoxy colored sand layer;

s813, construction of a transparent high-strength wear-resistant finish paint layer: and finely polishing the color sand layer by using a polisher, cleaning and removing dust, and finally, roll-coating the transparent high-strength polyurethane matte wear-resistant finish paint.

9. The flatness and crack control construction method for the super large area terrace according to claim 8, wherein the construction of the epoxy mortar ground layer comprises the following steps:

s821, preprocessing: mechanically polishing and absorbing dust on the poured steel fiber concrete ground to expose structural micropores on the concrete surface, scrubbing the partially greasy or damp ground by using special cleaning solution containing alcohol, ester, surfactant and the like, then performing well-shaped pattern sawing treatment by using a sawing machine, and filling epoxy mortar;

s822, coating base oil: coating the base surface of the treated clean cement with a primer by using a glue scraper, wherein the coating is performed in two times of longitudinal and transverse directions, and the full coating and uniform thickness are required;

s823, coating of a color mortar layer: mixing epoxy resin and a curing agent according to the proportion of 1:0.4, then adding color stone sand which is 3.5 times of the weight of the epoxy resin, and stirring for about 2-3 min to form epoxy color quartz mortar; pouring the epoxy color quartz mortar on the cement base surface coated with the base oil, uniformly coating the epoxy color quartz mortar, and simultaneously controlling the thickness of an epoxy color quartz mortar layer; firstly, carrying out compaction treatment by using a toothed ash spoon and then using a plain-end ash spoon; rolling the epoxy colored sand layer or compacting and polishing the epoxy colored sand layer by using a polishing machine; waiting for the mortar layer to be solidified;

s824, surface shading: and spraying or blade-coating a layer of epoxy resin surface oil on the surface of the cured epoxy colored sand layer, wherein the surface layer is required to be fine and uniform in scraping.

10. The construction method for controlling flatness and crack prevention of the super-large-area terrace according to claim 1, wherein S9, the construction of the ground deformation joint comprises the following steps:

s91, reserving 8-10mm construction joints during ground pouring: nailing a foam plate with the thickness of 3-5mm on the concrete side surface of the terrace by using cement nails, wherein the distance between the foam plate and the concrete side surface of the terrace is 40mm, and embedding an aluminum alloy strip after the concrete is stabilized;

and S92, after the construction of the ground surface layer is finished, the installation of the shaping deformation joint is carried out.

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