CN102691401B - Construction method for large-area concrete weighbridge - Google Patents
Construction method for large-area concrete weighbridge Download PDFInfo
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- CN102691401B CN102691401B CN201210198192.2A CN201210198192A CN102691401B CN 102691401 B CN102691401 B CN 102691401B CN 201210198192 A CN201210198192 A CN 201210198192A CN 102691401 B CN102691401 B CN 102691401B
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Abstract
The invention discloses a construction method for a large-area concrete weighbridge. The construction method comprises the steps of: dividing the locations of a construction water flowing section and a construction separation joint, erecting a weighbridge side template, installing a force transmission rod at a junction of the water flowing section, erecting a laser leveller, fixing a levelling staff, selecting a levelling base point, pouring concrete in a space surrounded by weighbridge templates, vibrating, compacting and levelling the weighbridge by the leveller, finishing surface conditioning and polishing of the concrete weighbridge before the final solidification of the concrete, maintaining the concrete weighbridge, cutting the construction separation joint within 24h, stuffing the construction separation joint and carrying out secondary maintenance. By the construction method, the technical problem that the whole levelling degree of the large-area weighbridge is very difficult to control is solved; the problems that the cost of later maintenance of the ground and the use quantity of the templates are very high since the construction joint of the large-area concrete weighbridge is very prone to breakage is solved; and the problems such as breakage along a warehouse dividing joint on the large-area concrete weighbridge, easy hollowing in the layered pouring of the weighbridge, easy cracking and the like are solved.
Description
Technical field
The present invention relates to a kind of job practices of large area concrete terrace.
Background technology
The conventional method of large area concrete floor construction be with simple guiding ruler by, clearance gauge plug, with guiding ruler, check planeness, conventional method can only check part, cannot embody the integral smoothness of large area terrace, is difficult to improve the construction quality of concrete terrace.Large area concrete terrace is subject to wheel load effect in construction, and constuction joint is easy to produce damaged, thereby the later maintenance expense on ground and the use amount of template are also increased greatly.On large area concrete ground, parting seam is because maintenance and template support reason can produce along defects such as seam are damaged, and terrace placement layer by layer also can bring easy hollowing, the problem such as easy to crack.
Summary of the invention
The job practices that the object of this invention is to provide a kind of large area concrete terrace, solve the integral smoothness technical problem very rambunctious of large area terrace; And the constuction joint that solves large area concrete terrace is easy to produce the later maintenance expense on damaged ，Shi ground and the too large problem of use amount of template; Also solving parting seam on large area concrete terrace can produce along seam breakage, the easy hollowing of terrace placement layer by layer, the problem such as easy to crack.
For achieving the above object, the present invention adopts following technical scheme:
A job practices for large area concrete terrace, construction sequence is as follows:
Step 1, divide construction flowing water section and construction partitioning slot position, flatness detector is according to flowing water segment boundary planning survey line, all slotted lines are parallel straight line, and perpendicular to the longest flowing water segment boundary, slotted line divides north-south slotted line and East and West direction slotted line, slotted line is to the youthful and the elderly 3.3528m, slotted line is than terrace length and the short 1.2192m of width, the slotted line number of both direction is identical, all slotted lines equal the total length of all slotted lines in the other direction at the total length of a direction, according to FF/FL standard, determine the planeness FF value of each flowing water section, high difference FL,
Step 2, installing of terrace side template, forms triangular support bracket by terrace side template, main joist, secondary joist and diagonal brace; Be controlled at+0mm of template absolute altitude suitable for reading and-3mm in, terrace side template is answered reserving hole, so that dowel bar inserts;
Step 3, installs dowel bar at flowing water section intersection, and dowel bar adopts plain steel-bar, at interval of 200mm-400mm, arranges one, and half is anchored at dowel bar in plan concreting, and butter is smeared on second half surface, can be free to slide;
Step 4, set up laser leveling instrument, laser leveling instrument comprises generating laser, laser pickoff and leveling staff, and generating laser is fixed on the concrete floor of intending construction, makes the laser beam that generating laser is launched rotate to form a laser controlling plane in plan construction flowing water section;
Step 12, carries out the joint-cutting of constuction joint in 24 hours, and fills construction partitioning slot;
Step 13, carries out secondary maintenance.
The scope of described plan construction flowing water Duan edge Li Qiang limit 200mm is interior by manually carrying out unwrapping wire, leveling.
Described step 1, when the planeness of carrying out flatness detector detects, calculating each piece test zone except 0.6096m boundary line, determine the percentage that will get rid of, if the area within the scope of the 0.6096m of boundary line surpasses 25% of the gross area, ignore the border of 0.6096m, and measure monoblock terrace plate.
Concrete in described step 8 is produced by Of Concrete Mixing Station; Concrete specification: C30 concrete, within 28 days, intensity is not less than 30 MPa, and water/binder ratio is not more than 0.5; Cement adopts the Portland cement that is not less than 42.5 labels, broken granite or cobble for coarse aggregate, and maximum particle diameter is not more than 25 millimeters, and fines adopts clean river sand, fineness modulus 2.4-2.7; Concrete mix: cement consumption is not less than 350Kg/m3, sand coarse aggregate ratio should be controlled at 35-40%; Concrete slump: 16 ± 2cm, maximum 18cm, time of setting: about 3 hours initial setting times.
Described step 10, the surfacing polishing minute of concrete floor is slightly smeared mill, fine grinding and is ground eventually three phases and carry out;
Corase grind is to carry out after building rear 3-4h concrete initial set, adopts evenly troweling compacting repeatedly of disk, and each will polish all over after finishing after surface moisture evaporation next time again; With floating rule, further scrape and smear leveling simultaneously, globality screeding and compaction, the magma of area of should take while slightly smearing is oozed out as main target, and during corase grind, operating personnel want before pin the soft sole with steel plate;
Fine grinding is before concrete final set, to carry out after concreting, uses two disk finishers to carry out polishing, uses electric grinding machine polishing; After using disk finisher to grind, re-use blade polishing; During each polishing, blade should further tilt, and to concrete surface, increases frictional force, makes terrace glossiness even;
Smearing is eventually substantially to solidify and carry out on first 1 hour its surface of concrete final set, steps on while only having extremely slight vestige, and quality inspection personnel checks comprehensively again, for undesirable position, with the further press polish of finisher, smears reality.
Described step 11, after concrete polishing finishes, mustn't be on terrace at least 7 days moving heavy object, keep moistening maintenance state, use plastic film and other material to cover, concrete and external isolation, when facing concrete intensity does not reach 1.2MPa, forbid people.
Described step 12, the lamina membranacea extension 20mm that builds for the first time concrete of described constuction joint, dismantles and builds for the first time after the lamina membranacea of concrete, excises the wide concrete of building for the first time of unnecessary 20mm, then builds for the second time building of concrete.
Compared with prior art the present invention has following characteristics and beneficial effect:
The present invention has overcome the integral smoothness technical problem very rambunctious of large area terrace, the constuction joint that has overcome large area concrete terrace is easy to produce damaged, make the later maintenance expense on ground and the too large problem of use amount of template, also overcome parting seam on large area concrete terrace and can produce along seam breakage, the easy hollowing of terrace placement layer by layer, the problem such as easy to crack.
Terrace end face design elevation of the present invention is controlled automatically by laser and computer, and adjust in real time, adjust each second 10 times, can reach the ground level of Single-handed Dinghy open-Laser precision, ground flat degree and levelness are 3-5 times of manual leveling operating type, concrete density improves more than 20%, and applicable harsh concrete, fibrous concrete and large aggregate concrete.
The present invention can complete the compacting of vibrating of 22 ㎡ terraces in 3min, and operation work efficiency improves 100-300%.The work of building of the 100-200 of completing per hour square metre, can complete 1000-2000 square metre average every day, and adopt conventional method, and the terrace levelling amount of finishing the work every day is only 900m
2left and right; And reduce artificial more than 30%, be particularly suitable for construction period tight, build the object of construction production that area is large, quality requirement is high.Leveling work, saves manually, saves template.
The present invention can reduce parting seam, can accomplish to construct without parting seam.On large area concrete ground, parting seam is because maintenance and template support reason can produce along defects such as seam are damaged, adopt laser smoothing after joint-cutting technology can avoid these problems.
The present invention can be so that the ground globality of the large area terrace after building be better, can avoid on the one hand easy hollowing that terrace placement layer by layer brings, the problem such as easy to crack, and the globality that can reduce on the other hand a large amount of constuction joint ，Shi ground is better.
In the present invention, generating laser is independently fixing, floor construction can large area be built the uniformity that also can guarantee ground level, absolute altitude is not subject to template contral, can not produce accumulated error, compare with conventional method, the later maintenance expense on constuction joint ，Shi ground and the use amount of template that can greatly reduce terrace also greatly reduce.The leveling head Automatic Levelling of leveling instrument hydraulic drive, 10 times/s adjusts absolute altitude in real time automatically; Be furnished with vibrator, vibration frequency, 3000 times/min, the control of the twocouese gradient is automatically controlled hydraulic system by computer and is completed in length and breadth, guarantees accurate control and the enforcement of the terrace gradient.Laser smoothing head is comprised of scraper plate, cloth spiral, vibrator, leveling beam four parts, and during by construction, multiple working procedure is integrated together, and by machine is disposable, completes, and improves work efficiency, saves manually.
The present invention adopts automatic checkout equipment, and standard is U.S. ACI standard-F numerical method, and planeness FF represents the fluctuating quantity of terrace whole meaning, and levelness FL represents the inclined degree of terrace whole meaning.Tradition ruler inspection method, can only local measurement.
The present invention can be widely used in the construction of the engineering terraces such as building surface in big industrial factory, storage, logistics.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention will be further described in detail.
Fig. 1 is structural representation of the present invention.
Fig. 2 is the step 2 schematic diagram in the present invention.
Fig. 3 is step 4-six schematic diagram in the present invention.
Fig. 4 is the schematic diagram of the step 12 in the present invention.
Reference numeral: 1-generating laser, 2-laser pickoff, 3-leveling staff, 4-hand held receiver, 5-build for the first time concrete, 6-and build for the second time concrete, 7-constuction joint, 8-terrace side template, 9-main joist, 10-secondary joist, 11-diagonal brace.
The specific embodiment
Embodiment is shown in Figure 1, a kind of job practices of large area concrete terrace, and construction sequence is as follows:
Step 1, divides construction flowing water section and construction partitioning slot position, according to site operation, disposes, and the sole plate of works area, structure roof are divided respectively flowing water section, according to flowing water section dividing condition, calculates the area of building of sole plate and base roof plate.
The flatness detector of check planeness is according to flowing water segment boundary planning survey line, all slotted lines are parallel straight line, and perpendicular to the longest flowing water segment boundary, slotted line divides north-south slotted line and East and West direction slotted line, slotted line is to the youthful and the elderly 3.3528m, slotted line is than terrace length and the short 1.2192m of width, the slotted line number of both direction is identical, all slotted lines equal the total length of all slotted lines in the other direction at the total length of a direction, according to FF/FL standard, determine the planeness FF value of each flowing water section, high difference FL.
Step 2, shown in Figure 2, terrace side template 8 adopts the thick composite board formwork of 15mm, and main joist 9 adopts 100mm * 100mm lumps of wood, and secondary joist 10 adopts 50 * 100mm lumps of wood, primary and secondary skeletal frame and lumps of wood diagonal brace 11 form triangular support bracket fixed form, template end face absolute altitude should arrange reference point, draw and connect absolute altitude control line, be controlled at+0mm of template absolute altitude suitable for reading and-3mm in, template should be reserved the hole of 300 millimeters of spacing, so that dowel bar inserts; The moment at concreting checks formwork elevation measuring, in order to avoid affect the planeness of seam crossing.The scope domestic demand that can not contact ，Li Qiang limit 200mm due to wall limit laser leveling instrument will manually flatten, thus need unwrapping wire, as the reference of artificial leveling.
Step 3, installs dowel bar at flowing water section intersection, and dowel bar adopts plain steel-bar, diameter 25mm, length 400mm, arranges one at interval of 200mm-400mm, half is anchored at dowel bar in plan concreting, and butter is smeared on second half surface, can be free to slide.
Step 4, shown in Figure 3, set up laser leveling instrument, laser leveling instrument comprises generating laser 1, laser pickoff 2 and leveling staff 3.Before large-area construction, first need to have a fling at, then use leveling staff to check terrace absolute altitude, Level System is adjusted to optimum level.Before using, laser leveling instrument is carried out to equipment debugging: from initial condition, draw on schedule and make 2 fixed reference bench marks, require the good intervisibility of two fixed datum phases mutual energy, bench mark precision ± 1 millimeter.After this, set up generating laser 1, then draw terrace absolute altitude to laser leveling instrument from initial condition on schedule.
During formal use, generating laser 1 is fixed on the concrete floor of intending construction, makes the laser beam that generating laser 1 is launched rotate to form a laser controlling plane in plan construction flowing water section.
The detailed use step of laser leveling instrument is as follows:
1, first generating laser 1 is placed in to the height of the design elevation 1.981m-2.1336m that is above the ground level, while arranging the position of transmitter, should guarantees that its passage is not interrupted and disturb; Intend the interior hand held receiver 4 of using of scope of construction flowing water Duan edge Li Qiang limit 200mm, by manually carrying out unwrapping wire, leveling;
2, determine and install the height of leveling staff;
3, laser pickoff 2 is placed on concrete, confirms that two laser pickoffs 2 are all very clear on transmitter, and absolute altitude is controlled and is switched to manual control;
4, according to level gauge, with leveling head hoisting frame levelling machine;
5,, in the place near laser pickoff 2 masts, leveling staff 3 rings are placed into Li top, and keep vertical state;
6, use the absolute altitude that raises/reduce to control, adjust the height of plough, until leveling instrument shows correct height;
7,, at opposite side repeating step 6, then reexamine original that side;
Once 8 ploughs reach predetermined absolute altitude, manually turn down laser pickoff ，Cong top down, until leveling instrument shows correct absolute altitude signal, at opposite side, repeat this step;
9, absolute altitude is controlled and is switched to automatic control;
10, the distance of leveling 1.8m left and right, then checks height, adjusts if desired again.
Because the covering radius of laser pickoff 2 is 50m to the maximum, 30m accepting state is best.
The most important factor that affects concrete terrace construction quality is concrete.Higher to planeness requirement, just stricter to concrete quality requirement, wherein most important factor is, the concrete slump and initial setting time that per car is delivered to scene should keep basically identical.Specific requirement is as follows: concrete must be produced by Of Concrete Mixing Station, concrete specification: C30 concrete, within 28 days, intensity is not less than 30 MPa.Water/binder ratio: be not more than 0.5; In feeding process, must not arbitrarily add water.Cement: adopt the Portland cement that is not less than 42.5 labels.Aggregate: the aggregate that grating is good.Broken granite or cobble for coarse aggregate, maximum particle diameter is not more than 25mm.Fines adopts clean river sand, and fineness modulus 2.4-2.7 is advisable.Concrete mix: cement consumption is not less than 350Kg/m3.For avoiding producing surface quality problems, sand coarse aggregate ratio should be controlled at 35-40%.Concrete slump: 16 ± 2 mm, maximum 18 mm.Time of setting: about 3 hours initial setting times.For avoiding terrace to occur random crack, the time of cutting contracting seam should (in 24 hours) carry out within the time as far as possible early.Concrete conveyance speed should guarantee approximately 30 cubes ms/h, and feeding speed is even, and dwell interval should be reduced in centre as far as possible, to prevent cold junction.
If the dead time surpasses 1 hour, this place should arrange one constuction joint and can not construct continuously.In construction, should consider to cause the reduction of concrete slump due to the impact of concrete pumping height, construction temperature and pump time comprehensively, and carry out in time the adjustment of match ratio.
Terrace board concrete build adopt thin concrete lift, incremental, progressively evenly raise, once arrive the continuous placing technique of pushing up, while building, adopt inclined plane delamination, An1:6 pushes ahead on slope, lower floor's shake tamper is perpendicular to building direction from bottom to top, upper strata shake tamper is perpendicular to building direction from top to bottom, strict control shake and smash spacing, to be not more than 1.5 times of vibrating spear operating radius, be advisable, be controlled at 400～500mm left and right.The shake time of smashing is preferably 20s left and right, and with concrete slurry floating, stone sinks, and does not occur that bubble is suitable.Shake tamper is inserted and is pulled out slowly soon, guarantees concrete pouring quality.
In laser leveling instrument telescopic arm effective range, first with manually concrete roughly being paved and come, according to relief, control concrete absolute altitude and planeness roughly, the advanced pedestrian's work of the concrete surface layer density of vibrating, surface is general on laitance, then by laser leveling instrument disposable from one end, complete in order in order vibrate, compacting, leveling work, while flattening with adjacent surface in effective range of the every leveling of laser leveling instrument, the leveling face that has overlap joint 1/3 fabric width, assurance connects the planeness of stubble.In flattening course, at leveling instrument telescopic arm two ends, be respectively furnished with a human assistance, process leveling instrument telescopic arm and vibrate and have under chi unnecessary ash eliminate and lack filling work when grey, thereby avoid flattening Hou ground, have localized indentation to show especially to resemble.
The surfacing polishing minute of concrete floor is slightly smeared mill, fine grinding and is ground eventually three phases and carry out:
One, corase grind.Be approximately to build rear 3-4h, concrete is initial set, adopts disk evenly repeatedly, and the situation that corase grind pass is looked mill determines, troweling compacting.Each will polish all over after finishing after surface moisture evaporation next time again.With 3m floating rule, further scrape and smear leveling simultaneously.Globality screeding and compaction, the magma of area of should take while slightly smearing is oozed out as main target.During corase grind, operating personnel want before pin the soft sole with steel plate.
Two, fine grinding.After concreting, before the concrete final set of 8h left and right, use two disks to smear 0 ray machine and carry out polishing, in order to reach compacted concrete, improve the abrasion resistance of concrete surface, electric grinding machine polishing more than operating weight 500kg.After using disk finisher to grind, re-use blade polishing.During each polishing, blade should further tilt, and to concrete surface, increases frictional force, makes terrace glossiness even.
Three, smear eventually.Lh before concrete final set, solidify substantially on its surface, steps on while only having extremely slight vestige, and quality inspection personnel checks comprehensively again, for undesirable position, with the further press polish of finisher, smears reality.
During winter construction, in order to guarantee to receive face quality, prevent that concrete from freezing, outer the making a circle of whole main building, all with interim baffle plate, seal, only stay several accesss.Concrete covers thick plastic sheeting and fire-retardant quilt after receiving face in time, carries out concrete maintenance work.
Step 12, shown in Figure 4, carry out the joint-cutting of constuction joint 7 in 24 hours, and fill construction partitioning slot.For guaranteeing the concordant of constuction joint, the lamina membranacea extension 20mm that builds for the first time concrete 5 of constuction joint, dismantles and builds for the first time after the lamina membranacea of concrete 5, excises the wide concrete of building for the first time of unnecessary 20mm, then builds for the second time building of concrete 6.
Step 13, carries out secondary maintenance.
The present invention can adopt the quality inspection standard of ACI (ACI) and Canadian Standards Association (CSA) concrete ground surface evenness and levelness, i.e. FF/FL standard.F numerical method is the standard that ACI (ACI ll7) and Canadian Standards Association (CSA A23.1) are standard and measurement concrete ground leveling and the discrepancy in elevation.It is planeness as quality index: FF that this standard has been introduced two F numbers, FL is high difference (levelness), planeness is being related to protuberance and the depression of terrace, high difference is being related to inclination or the discrepancy in elevation of terrace, that is to say that planeness FF represents the fluctuating quantity of terrace whole meaning, levelness FL represents the inclined degree of terrace whole meaning.Higher F numerical value represents that the planeness of terrace is better.F numerical value is linear relationship, so F20 than F10 smooth two times, but only have F40 half is flat.
General fine finishining building Nei warehouse area, Administrative area and other trim panels FF=25, FL=18, the manufacturing district in batching building, thawing building and fine finishining building FF=50 FL=35.
According to concrete structure engineering inspection of quality standard (GB50204-2002), the planeness allowable error of concrete structure ground flooring is 2m ± 8mm, and according to u.s. norm, the numerical value of evaluation ground flat degree and the discrepancy in elevation is F numerical value, F-numerical value is compared with the standard of ruler inspection, can descend column data: FF25 to be about the discrepancy in elevation of 3m ± 6mm, FF50 is about the discrepancy in elevation of 3m ± 3mm, and FF100 is about the discrepancy in elevation of 3m ± 1.5mm.
The measuring method of FF/FL numerical value is that the automatic flatness detector ，Yi of employing AST E1155 U.S. ACI standard one F numerical method is standard, and adopts the method for mathematic statistics, evaluates on the whole the planeness of terrace.
Before terrace integral construction, optional test model district carries out tentative detection.The survey line of selected some, chooses on every line and is no less than 20 points, before test, need to will in selection area, clean out, in order to avoid affect measurement result.Through flatness detector, detect, the roughness measurement result on every line is inserted roughness measurement result statistical form, then calculates planeness result value with mathematical statistics method, reaches American Standard requirement.
Use flatness detector to detect ground flat degree, need to meet following condition:
One, the area of detection 3000-8000ft of flatness detector
2(278.7-743.2m
2), be at least 2000-10000ft
2(185.8-929m
2), if area of detection is too small, statistics is may error larger;
Two, calculate each the piece test zone except 2 feet of (0.6096m) boundary lines, then determine the percentage that will get rid of.If the area in (0.6096m) scope of 2 feet of boundary lines surpasses 25% of the gross area, ignore the border of 2 feet (0.6096m), and measure monoblock terrace plate;
Three, all lines of need measuring should be straight line and and should be parallel, and perpendicular to the longest test section border.If terrace plate is rectangular, along north, to southern long axis operation, slotted line must be all north and south and thing.If terrace plate plate is triangle, line was must be not only parallel but also perpendicular to triangle longest edge;
Four, slotted line must guarantee it is straight line, and guarantees that at least 11 feet (3.3528m) are long.Longer slotted line measurement result is more effective.Due to the border rule of 2 feet, line must be shorter 4 feet than terrace plate length and width.The slotted line number of both direction must be identical, and the total length in a direction of all slotted lines must equal the total length of all slotted lines in the other direction;
Five, can not collect 2 feet of (0.6096m) interior data of following situation, as: constuction joint, perforation, reserved area, stub tenon, or other discontinuity zones on terrace plate.Joint-cutting (anticracking is controlled seam) can be passed, but constuction joint can not be passed.
Claims (7)
1. a job practices for large area concrete terrace, is characterized in that: construction sequence is as follows:
Step 1, divide construction flowing water section and construction partitioning slot position, flatness detector is according to flowing water segment boundary planning survey line, all slotted lines are parallel straight line, and perpendicular to the longest flowing water segment boundary, slotted line divides north-south slotted line and East and West direction slotted line, slotted line is to the youthful and the elderly 3.3528m, slotted line is than terrace length and the short 1.2192m of width, the slotted line number of both direction is identical, all slotted lines equal the total length of all slotted lines in the other direction at the total length of a direction, according to FF/FL standard, determine the planeness FF value of each flowing water section, high difference FL,
Step 2, installing of terrace side template, forms triangular support bracket by terrace side template (8), main joist (9), secondary joist (10) and diagonal brace (11); Be controlled at+0mm of template absolute altitude suitable for reading and-3mm in, terrace side template is answered reserving hole, so that dowel bar inserts;
Step 3, installs dowel bar at flowing water section intersection, and dowel bar adopts plain steel-bar, at interval of 200mm-400mm, arranges one, and half is anchored at dowel bar in plan concreting, and butter is smeared on second half surface, can be free to slide;
Step 4, set up laser leveling instrument, laser leveling instrument comprises generating laser (1), laser pickoff (2) and leveling staff (3), generating laser (1) is fixed on the concrete floor of intending construction, makes the laser beam that generating laser (1) is launched rotate to form a laser controlling plane in plan construction flowing water section;
Step 5, is intending fixedly leveling staff (3) of construction flowing water Duan edge;
Step 6, is fixed on laser pickoff (2) in the leveling head of laser leveling instrument, makes the terrace absolute altitude of leveling staff (3) corresponding with the leveling head of laser leveling instrument;
Step 7, chooses ordnance bench mark, and terrace side template end face absolute altitude arranges reference point, draws and connects absolute altitude control line;
Step 8, concreting in the space enclosing at terrace side template, terrace board concrete build adopt thin concrete lift, incremental, progressively evenly raise, once arrive the continuous placing technique of pushing up, while building, adopt inclined plane delamination ，An1:6 slope to push ahead;
Step 9, by leveling instrument, complete the vibrating of terrace, compacting and leveling work, the leveling head of leveling instrument is comprised of scraper plate, cloth spiral, vibrator, leveling beam four parts, the control of terrace plate absolute altitude and planeness, by the leveling head Automatic Levelling that flattens instrument hydraulic drive, is that 10 times/s adjusts absolute altitude in real time automatically; The vibration frequency of vibrator is 3000 times/min, and the control of the twocouese gradient completes by automatically controlling hydraulic system in length and breadth; Open the automatic control system of laser leveling instrument, the laser signal that laser pickoff basis senses is high with the frequency automatic benchmarking of 10 times/s, the gradient is adjusted in real time;
Step 10 completes the surfacing polishing of concrete floor before concrete final set;
Step 11, the maintenance of concrete floor;
Step 12, carries out the joint-cutting of constuction joint (7) in 24 hours, and fills construction partitioning slot;
Step 13, carries out secondary maintenance.
2. the job practices of large area concrete terrace according to claim 1, is characterized in that: the scope of described plan construction flowing water Duan edge Li Qiang limit 200mm is interior by manually carrying out unwrapping wire, leveling.
3. the job practices of large area concrete terrace according to claim 1, it is characterized in that: described step 1, when the planeness of carrying out flatness detector detects, calculating each piece test zone except 0.6096m boundary line, determine the percentage that will get rid of, if the area within the scope of the 0.6096m of boundary line surpasses 25% of the gross area, ignore the border of 0.6096m, and measure monoblock terrace plate.
4. the job practices of large area concrete terrace according to claim 1, is characterized in that: the concrete in described step 8 is produced by Of Concrete Mixing Station; Concrete specification: C30 concrete, within 28 days, intensity is not less than 30 MPa, and water/binder ratio is not more than 0.5; Cement adopts the Portland cement that is not less than 42.5 labels, broken granite or cobble for coarse aggregate, and maximum particle diameter is not more than 25 millimeters, and fines adopts clean river sand, fineness modulus 2.4-2.7; Concrete mix: cement consumption is not less than 350Kg/m3, sand coarse aggregate ratio should be controlled at 35-40%; Concrete slump: 16 ± 2cm, maximum 18cm, time of setting: 3 hours initial setting times.
5. the job practices of large area concrete terrace according to claim 1, is characterized in that: described step 10, and the surfacing polishing minute corase grind of concrete floor, fine grinding and eventually mill three phases carry out;
Corase grind is to carry out after building rear 3-4h concrete initial set, adopts evenly troweling compacting repeatedly of disk, and each will polish all over after finishing after surface moisture evaporation next time again; With floating rule, further scrape and smear leveling simultaneously, globality screeding and compaction, the magma of area of should take during corase grind is oozed out as main target, and during corase grind, operating personnel want the soft sole of threading steel plate before pin;
Fine grinding is before concrete final set, to carry out after concreting, uses two disk finishers to carry out polishing, uses electric grinding machine polishing; After using disk finisher to grind, re-use blade polishing; During each polishing, blade should further tilt, and to concrete surface, increases frictional force, makes terrace glossiness even;
Mill is substantially to solidify and carry out on first 1 hour its surface of concrete final set eventually, steps on while only having extremely slight vestige, and quality inspection personnel checks comprehensively again, for undesirable position, with the further press polish of finisher, smears reality.
6. the job practices of large area concrete terrace according to claim 1, it is characterized in that: described step 11, after concrete polishing finishes, mustn't be on terrace at least 7 days moving heavy object, keep moistening maintenance state, use plastic film material to cover, concrete and external isolation, when facing concrete intensity does not reach 1.2MPa, forbid people.
7. the job practices of large area concrete terrace according to claim 1, it is characterized in that: described step 12, the template extension 20mm that builds for the first time concrete (5) of described constuction joint (7), dismantle and build for the first time after the template of concrete (5), excise the wide concrete of building for the first time of unnecessary 20mm, then build for the second time building of concrete (6).
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| CN107060171A (en) * | 2016-12-27 | 2017-08-18 | 上海森信建设工程有限公司 | The super flat reinforced concrete flooring of large area and colored diamond dust surface layer one-step moulding method |
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