CN102691401A - Construction method for large-area concrete weighbridge - Google Patents

Construction method for large-area concrete weighbridge Download PDF

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Publication number
CN102691401A
CN102691401A CN2012101981922A CN201210198192A CN102691401A CN 102691401 A CN102691401 A CN 102691401A CN 2012101981922 A CN2012101981922 A CN 2012101981922A CN 201210198192 A CN201210198192 A CN 201210198192A CN 102691401 A CN102691401 A CN 102691401A
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concrete
terrace
construction
leveling
laser
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CN2012101981922A
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Chinese (zh)
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CN102691401B (en
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李向梅
章勇
杨军霞
霍君娣
魏硕
梅军军
孙玉静
渠德胜
张凤喜
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北京城建建设工程有限公司
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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

The job practices of large area concrete terrace

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 lean on, the clearance gauge plug, check planeness with guiding ruler, conventional method can only be checked the part, can't embody the integral smoothness of large tracts of land terrace, is difficult to improve the construction quality of concrete terrace.The large area concrete terrace receives the wheel load effect in construction, constuction joint is easy to produce damaged, thereby the later maintenance expense on ground and the use amount of template are also increased greatly.Parting seam be owing to maintenance and template support reason can produce along defectives such as seam breakages on the large area concrete ground, and the terrace placement layer by layer also can bring easy hollowing, problem such as easy to crack.

Summary of the invention

The job practices that the purpose of this invention is to provide a kind of large area concrete terrace, the integral smoothness that solve the large tracts of land terrace is difficult to the technical problem of control; And the constuction joint that solves the large area concrete terrace is easy to produce damaged, makes the later maintenance expense on ground and the too big problem of use amount of template; The parting seam that also solves on the large area concrete terrace can produce problems such as the edge seam is damaged, the terrace placement layer by layer is prone to hollowing, easy to crack.

For realizing above-mentioned purpose, the present invention adopts following technical scheme:

A kind of job practices of large area concrete terrace, construction sequence is following:

Step 1 is divided construction flowing water section and construction partitioning slot position, and the planeness 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, and slotted line is than the short 1.2192m of terrace length and width, and the slotted line number of both direction is identical; All slotted lines equal the total length of all slotted lines on other directions at the total length of a direction; According to the FF/FL standard, confirm the planeness FF value of each flowing water section, high difference FL;

Step 2, installing of terrace side template formed triangular support bracket by terrace side template, main joist, secondary joist and diagonal brace; Template absolute altitude suitable for reading is controlled at+0mm and-3mm in, the terrace side template is answered reserving hole, so that dowel bar inserts;

Step 3 is installed dowel bar at flowing water section intersection, and dowel bar adopts plain steel-bar, and every interval 200mm-400mm arranges one, and half is anchored at dowel bar in the plan concreting, and butter is smeared on second half surface, and it can be free to slide;

Step 4; Set up the laser smoothing appearance; The laser smoothing appearance comprises generating laser, laser pickoff and leveling staff, and generating laser is fixed on the concrete floor of intending construction, and the laser beam that generating laser is launched forms a laser controlling plane in the rotation of plan construction flowing water section;

Step 5 is at the fixing leveling staff of the edge that intends construction flowing water section;

Step 6 is fixed on laser pickoff on the leveling head of laser smoothing appearance, makes the terrace absolute altitude of leveling staff corresponding with the leveling head of laser smoothing appearance;

Step 7 is chosen ordnance bench mark, and terrace side template end face absolute altitude is provided with reference point, draws to connect the absolute altitude control line;

Step 8; Concreting in the space that the terrace side template surrounds; The terrace board concrete is built and is adopted thin concrete lift, incremental, the continuous placing technology that progressively evenly raises, once arrive the top, and employing inclined-plane layering is pushed ahead by the slope of 1:6 when building;

Step 9; Accomplish the vibrating of terrace, compacting and leveling work by the leveling appearance; The leveling head of leveling appearance is made up of scraper plate, cloth spiral, vibrator, leveling beam four parts; The control of terrace plate absolute altitude and planeness is that 10 times/s adjusts absolute altitude in real time automatically by the leveling Automatic Levelling that leveling appearance fluid power drives; The vibration frequency of vibrator is 3000 times/min, and the control of the twocouese gradient is accomplished by automatic controlled hydraulic system in length and breadth; Open the automatic control system of laser smoothing appearance, laser pickoff is adjusted with frequency automatic benchmarking's height, the gradient of 10 times/s according to the laser signal of sensing in real time;

Step 10 is accomplished the surfacing polishing of concrete floor before concrete final set;

Step 11, the maintenance of concrete floor;

Step 12 is carried out the joint-cutting of constuction joint in 24 hours, and fills the construction partitioning slot;

Step 13 is carried out the secondary maintenance.

Carry out unwrapping wire, leveling by manual work in the scope of edge 200mm of said plan construction flowing water section far from the wall limit.

Said step 1; When the planeness of carrying out the planeness detector detects; Calculating each piece test zone except that the 0.6096m boundary line, the definite percentage that will get rid of is if the area in the 0.6096m scope of boundary line surpasses 25% of the gross area; The border of then ignoring 0.6096m, and measure monoblock terrace plate.

Concrete in the said step 8 is produced by the commercial concrete agitator; The concrete specification: the C30 concrete, intensity was not less than 30 MPa in 28 days, and water/binder ratio is not more than 0.5; Cement adopts the Portland cement that is not less than 42.5 labels, and coarse aggregate is with broken granite or cobble, 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, and 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.

Said step 10, the surfacing polishing branch of concrete floor is slightly smeared mill, correct grinding and is ground three phases eventually and carry out;

Corase grind is to carry out after building back 3-4h concrete initial set, adopts evenly troweling compacting repeatedly of disk, and each will treat to polish after the surface moisture evaporation all over after finishing next time again; Further scrape with floating rule simultaneously and smear leveling, should ooze out with globality screeding and compaction, the magma of area when slightly smearing is main target, and operating personnel want to wear before the pin soft sole of steel plate during corase grind;

Correct grinding is after concreting, to carry out before the concrete final set, uses two disk finishers to polish, and uses the electric grinding machine polishing; After using the disk finisher to grind, re-use the blade polishing; During each the polishing, blade should further tilt, and increases frictional force to concrete surface, makes the terrace glossiness even;

Smearing eventually is to solidify basically on preceding 1 hour its surface of concrete final set to carry out, and steps on when having only extremely slight vestige, and quality inspection personnel is checked comprehensively again, for undesirable position, smears reality with the further press polish of finisher.

Said 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 the people.

Said step 12 is built the lamina membranacea extension 20mm of concrete the first time of said constuction joint, dismantle build the lamina membranacea of concrete for the first time after, excise unnecessary 20mm and builds concrete the wide first time, then carry out building 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 technical problem of the very difficult control of integral smoothness of large tracts of land terrace; The constuction joint that has overcome the large area concrete terrace is easy to produce damaged; Make the later maintenance expense on ground and the too big problem of use amount of template, the parting seam that has also overcome on the large area concrete terrace can produce problems such as the edge seam is damaged, the terrace placement layer by layer is prone to hollowing, easy to crack.

Terrace end face design elevation of the present invention is controlled by laser and computer automatically; And adjustment 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 suitable harsh concrete, fibrous concrete and big aggregate concrete.

The present invention can accomplish the compacting of vibrating of 22 ㎡ terraces in 3min, the operation work efficiency improves 100-300%.Per hour can accomplish 100-200 square metre the work of building, can accomplish 1000-2000 square metre average every day, and adopt conventional method, and the terrace levelling amount of finishing the work every day is merely 900m 2About; And reduce artificial more than 30%, be particularly suitable for construction period tight, build the object of construction production that area is big, quality requirement is high.Manual work is saved in leveling work, saves template.

The present invention can reduce parting seam, can accomplish not have the parting seam construction.Parting seam be owing to maintenance and template support reason can produce along defectives such as seam breakages on the large area concrete ground, adopt laser smoothing after the joint-cutting technology can avoid these problems.

The present invention can be so that the ground globality of the large tracts of land terrace after building be better, can avoid easy hollowing that the terrace placement layer by layer brings, problem such as easy to crack on the one hand, can reduce a large amount of constuction joints on the other hand, makes the globality on ground better.

Generating laser independent stationary among the present invention; Floor construction can large tracts of land be built the uniformity that also can guarantee ground level; Absolute altitude is not controlled by template, can not produce accumulated error, compares with conventional method; Can significantly reduce the constuction joint of terrace, the later maintenance expense on ground and the use amount of template are also greatly reduced.The leveling Automatic Levelling that leveling appearance fluid power drives, 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 accomplished by the automatic controlled hydraulic system of computer in length and breadth, guarantees the accurate control and the enforcement of the terrace gradient.The laser smoothing head is made up of scraper plate, cloth spiral, vibrator, leveling beam four parts, and multiple working procedure is incorporated into together in the time of will constructing, and by the disposable completion of machine, improves work efficiency, saves manual work.

The present invention adopts automatic checkout equipment, and standard is U.S. ACI standard-F numerical method, and planeness FF representes the fluctuating quantity of terrace whole meaning, and levelness FL representes 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 engineering terraces such as large scale industry factory building, storage, logistics.

Description of drawings

Below in conjunction with accompanying drawing the present invention is done further detailed explanation.

Fig. 1 is a structural representation of the present invention.

Fig. 2 is the step 2 sketch map among the present invention.

Fig. 3 is step 4-six sketch map among the present invention.

Fig. 4 is the sketch map of the step 12 among the present invention.

Reference numeral: 1-generating laser, 2-laser pickoff, 3-leveling staff, 4-hand held receiver, 5-build concrete, 6-for the first time and build concrete, 7-constuction joint, 8-terrace side template, 9-main joist, 10-secondary joist, 11-diagonal brace for the second time.

The specific embodiment

Embodiment is referring to shown in Figure 1, a kind of job practices of large area concrete terrace, and construction sequence is following:

Step 1 is divided construction flowing water section and construction partitioning slot position, disposes according to site operation, and the sole plate of works area, structure roof are divided the flowing water section respectively, according to flowing water section dividing condition, calculate the area of building of sole plate and base roof plate.

The planeness detector of check planeness is according to flowing water segment boundary planning survey line, and 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, and slotted line is than the short 1.2192m of terrace length and width, and the slotted line number of both direction is identical; All slotted lines equal the total length of all slotted lines on other directions at the total length of a direction; According to the FF/FL standard, confirm the planeness FF value of each flowing water section, high difference FL.

Step 2, referring to shown in Figure 2, terrace side template 8 adopts the thick composite board formwork of 15mm; Main joist 9 adopts 100mm * 100mm lumps of wood, and secondary joist 10 adopts 50 * 100mm lumps of wood, and primary and secondary skeletal frame and lumps of wood diagonal brace 11 are formed the triangular support bracket fixed form; Template end face absolute altitude should be provided with reference point, draws to connect the absolute altitude control line, template absolute altitude suitable for reading is controlled at+0mm and-3mm in; Template should be reserved the hole of 300 millimeters spacings, so that dowel bar inserts; At the moment of concreting inspection template absolute altitude, in order to avoid influence the planeness of seam crossing.Because wall limit laser smoothing appearance can not contact, want manual work to flatten from the scope domestic demand of wall limit 200mm, thus need unwrapping wire, as the reference of manual work leveling.

Step 3 is installed dowel bar at flowing water section intersection, and dowel bar adopts plain steel-bar; Diameter 25mm, length 400mm, every interval 200mm-400mm arranges one; Half is anchored at dowel bar in the plan concreting, and butter is smeared on second half surface, and it can be free to slide.

Step 4 referring to shown in Figure 3, is set up the laser smoothing appearance, and the laser smoothing appearance comprises generating laser 1, laser pickoff 2 and leveling staff 3.Before large-area construction, at first need have a fling at, use leveling staff that the terrace absolute altitude is checked then, Level System is adjusted to optimum level.Before using the laser smoothing appearance is carried out equipment debugging: draw on schedule and make 2 fixed reference bench marks from initial condition, require the good intervisibility of two fixed datum phases mutual energy, bench mark precision ± 1 millimeter.After this, set up generating laser 1, draw the terrace absolute altitude to the laser smoothing appearance from initial condition more on schedule.

During formal the use generating laser 1 is fixed on the concrete floor of intending construction, the laser beam that generating laser 1 is launched forms a laser controlling plane in the rotation of plan construction flowing water section.

Step 5 is at the fixing leveling staff 3 of the edge that intends construction flowing water section.

Step 6 is fixed on laser pickoff 2 on the leveling head of laser smoothing appearance, makes the terrace absolute altitude of leveling staff 3 corresponding with the leveling head of laser smoothing appearance; Use leveling staff 3 that the terrace absolute altitude is directed on the leveling head of laser smoothing appearance.The automatic control system of leveling appearance will be adjusted with frequency automatic benchmarking's height, the gradient of 10 times/s according to the laser signal that the laser pickoff on the leveling head is sensed in real time.Because generating laser is fixed after setting, can guarantee that the construction on large tracts of land ground does not produce accumulated error.

The detailed use step of laser smoothing appearance is following:

1, at first generating laser 1 is placed the height of the design elevation 1.981m-2.1336m that is above the ground level, when arranging the position of transmitter, should guarantee the not interrupted and interference of its passage; Intend the interior hand held receiver 4 of using of scope of edge 200mm of construction flowing water section, carry out unwrapping wire, leveling by manual work far from the wall limit;

2, confirm and install the height of leveling staff;

3, laser pickoff 2 is placed on the concrete, confirm that two laser pickoffs 2 are all very clear on transmitter, and absolute altitude control is switched to manual control;

4, according to level gauge, with a leveling hoisting frame levelling machine;

5,, leveling staff 3 rings are placed into the top of plough, and keep vertical state in place near laser pickoff 2 masts;

6, use the control of rising/reduction absolute altitude, the height of adjustment plough shows correct height until the leveling appearance;

7,, reexamine original that side then at opposite side repeating step 6;

8, in case plough reaches predetermined absolute altitude, manually turn down laser pickoff, from the top down, show correct absolute altitude signal, repeat this step at opposite side until the leveling appearance;

9, absolute altitude control is switched to automatic control;

10, the distance about leveling 1.8m, inspection height, adjustment more in case of necessity then.

Because the covering radius of laser pickoff 2 is 50m to the maximum, the 30m accepting state is best.

Step 7 is chosen ordnance bench mark, and terrace is surveyed template end face absolute altitude reference point is set, and draws to connect the absolute altitude control line.

Step 8, concreting in the space that the terrace side template surrounds.The terrace plate thickness is 500mm, adopts common C30 commercial concrete to build.

The most important factor that influences the concrete floor construction quality is a concrete.High more to the planeness requirement, just stricter to the quality of concrete requirement, wherein most important factor is that the concrete slump and initial setting time that per car is delivered to the scene should keep basically identical.Specific requirement is following: concrete must be produced by the commercial concrete agitator, and the concrete specification: the C30 concrete, intensity was not less than 30 MPa in 28 days.Water/binder ratio: be not more than 0.5; Must not arbitrarily add water in the feeding process.Cement: adopt the Portland cement that is not less than 42.5 labels.Aggregate: the aggregate that grating is good.Coarse aggregate is with broken granite or cobble, and 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 crack at random to occur, cut the time of the seam that contracts and in the time as far as possible early, (in 24 hours) to carry out.Transmission and concrete transmission speed should guarantee about 30 cubic metres/hour, and feeding speed is even, and dwell interval should be reduced in the centre as far as possible, to prevent cold junction.

If the dead time surpasses 1 hour, this place should be provided with one constuction joint and can not construct continuously.Should consider in the construction because the influence of concrete pumping height, construction temperature and pump time causes the reduction of concrete slump comprehensively, and in time carry out the adjustment of match ratio.

The terrace board concrete build adopt thin concrete lift, incremental, progressively evenly raise, once arrive the continuous placing technology of pushing up; Adopt the inclined-plane layering when building, push ahead by the slope of 1:6, 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; Spacing is smash in strict control shake, is advisable to be not more than 1.5 times of vibrating spear operating radius, is controlled at about 400~500mm.The shake time of smashing is preferably about 20s, and with concrete slurry come-up, stone sinks, and it is suitable bubble not occurring.The shake tamper is inserted soon and is pulled out slowly, guarantees concrete pouring quality.

Step 9 is accomplished the vibrating of terrace, compacting and leveling work by the laser smoothing appearance.The leveling head of laser smoothing appearance is made up of scraper plate, cloth spiral, vibrator, leveling beam four parts, and the control of terrace plate absolute altitude and planeness is that 10 times/s adjusts absolute altitude in real time automatically by the leveling Automatic Levelling that laser smoothing appearance fluid power drives; The vibration frequency of vibrator is 3000 times/min, and the control of the twocouese gradient is accomplished by automatic controlled hydraulic system in length and breadth; Open the automatic control system of laser smoothing appearance, laser pickoff is adjusted with frequency automatic benchmarking's height, the gradient of 10 times/s according to the laser signal of sensing in real time.

In laser smoothing appearance telescopic arm effective range, come with artificial concrete is roughly paved earlier, reach roughly planeness according to relief control concrete absolute altitude; The advanced pedestrian worker of the concrete surface layer density of vibrating; The surface is general on the laitance, then by the laser smoothing appearance disposable accomplish in order from an end in order vibrate, compacting, leveling work, when in effective range of the every leveling of laser smoothing appearance, flattening with adjacent surface; The leveling face that overlap joint 1/3 fabric width is arranged, assurance connects the planeness of stubble.In flattening course, respectively be furnished with a manual work at leveling appearance telescopic arm two ends auxiliary, handles leveling appearance telescopic arm and vibrate and have under the chi unnecessary ash to eliminate and lack the filling work when grey, resembles thereby the ground after avoiding flattening has localized indentation to show especially.

Step 10 is accomplished the surfacing polishing of concrete floor before concrete final set.The time of flour milling is determining the quality of leveling, and what can make too early that concrete surface produces mill revolves the nest flow liner, influences planeness; After bringing difficulty to buffed surface late, be difficult for troweling, sometimes also can because of final setting time to influencing concrete polishing effect.Preferably be controlled at concrete initial set and begin, surface moisture evaporates, and the people steps on and begins flour milling when not sinking basically.

The surfacing polishing branch of concrete floor is slightly smeared mill, correct grinding and is ground three phases eventually and carry out:

One, corase grind.Approximately be to build back 3-4h, concrete is initial set, adopts disk evenly repeatedly, and the corase grind pass is looked the situation decision of mill, troweling compacting.Each will treat to polish after the surface moisture evaporation all over after finishing next time again.Further scrape with the 3m floating rule simultaneously and smear leveling.Should ooze out with globality screeding and compaction, the magma of area when slightly smearing is main target.Operating personnel want to wear before the pin soft sole of steel plate during corase grind.

Two, correct grinding.After concreting, before the concrete final set of the 8h left and right sides, use two disks to smear 0 ray machine and polish,, improve the abrasion resistance of concrete surface, the electric grinding machine polishing that operating weight 500kg is above in order to reach compacted concrete.After using the disk finisher to grind, re-use the blade polishing.During each the polishing, blade should further tilt, and increases frictional force to concrete surface, makes the terrace glossiness even.

Three, smear eventually.Lh before concrete final set, solidify basically on its surface, steps on when having only extremely slight vestige, and quality inspection personnel is checked comprehensively again, for undesirable position, smears reality with the further press polish of finisher.

Step 11, the maintenance of concrete floor.After concrete polishing finishes, at least mustn't be on terrace in the 7d moving heavy object, and should keep moistening maintenance state.In order to prevent surface contamination, can use plastic film and other material to cover, concrete and external isolation.Between curing time, when facing concrete intensity does not reach 1.2MPa, forbid the people.

During the winter construction,, prevent that concrete from freezing, all seal, only stay several accesss with interim baffle plate outer the making a circle of whole main building in order to guarantee to receive the face quality.Concrete in time covers thick plastic sheeting and fire-retardant quilt after receiving face, carries out concrete maintenance work.

Step 12 referring to shown in Figure 4, is carried out the joint-cutting of constuction joint 7 in 24 hours, and fills the construction partitioning slot.For guaranteeing the concordant of constuction joint, build the lamina membranacea extension 20mm of concrete 5 first time of constuction joint, excise unnecessary 20mm and the wide first time build concrete after building the lamina membranacea of concrete 5 first time of dismantling, and then carries out building for the second time building of concrete 6.

Step 13 is carried out the 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.The F numerical method is ACI (ACI ll7) and Canadian Standards Association (CSA A23.1) for standard and measures the standard of the smooth and discrepancy in elevation of concrete floor.It is planeness as quality index: FF that this standard has been introduced two F numbers; FL is high difference (levelness); Planeness is concerning the protuberance and the depression of terrace; High difference is concerning the inclination or the discrepancy in elevation of terrace, that is to say that planeness FF representes the fluctuating quantity of terrace whole meaning, and levelness FL representes the inclined degree of terrace whole meaning.The F numerical value of healing high represents the planeness of terrace better.F numerical value is linear relationship, so F20 than F10 smooth two times, has only but that F40's is half the flat.

Warehouse area, administrative Office Area and other trim panels FF=25 in general fine finishining is built, FL=18, the manufacturing district in the 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 the 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 get the discrepancy in elevation that following data: FF25 is about 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 to adopt the automatic planeness detector of AST E1155, is standard with U.S. ACI standard one F numerical method, and adopts mathematical statistic method, estimates the planeness of terrace on the whole.

Before the terrace integral construction, the making an experiment property detection of optional test model district.The survey line of selected some is chosen on the every line and is no less than 20 points, before the test, and need be with cleaning out in the selection area, in order to avoid influence measurement result.Detect through the planeness detector, the roughness measurement result on every line inserts roughness measurement statistical form as a result, calculates the planeness result value with mathematical statistics method again, reaches the requirement of U.S. mark.

Use the planeness detector that ground flat degree is detected, need satisfy following condition:

One, the area of detection 3000-8000ft of planeness 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 bigger;

Two, calculating each piece test zone except that 2 feet (0.6096m) boundary lines is confirmed the percentage that will get rid of then.If the area in 2 feet (0.6096m) scopes in boundary line surpasses 25% of the gross area, then ignore the border of 2 feet (0.6096m), and measure monoblock terrace plate;

Three, all lines that need measure should be straight line and and should be parallel, and perpendicular to the longest test section border.If the terrace plate is rectangular, to the long axis operation in south, slotted line all must be north and south and thing along north.If terrace plate plate is a triangle, line must be not only parallel but also perpendicular to the triangle longest edge;

Four, slotted line must guarantee it is straight line, and guarantees that at least 11 feet (3.3528m) are long.Long slotted line measurement result is more effective.Because 2 feet borders rule, line must be lacked 4 feet than terrace plate length and width.The slotted line number of both direction must be identical, all slotted lines must equal the total length of all slotted lines on other directions at the total length of a direction;

Five, can not collect 2 feet (0.6096m) interior data of following situation, as: constuction joint, perforation, reserved area, stub tenon, or other discontinuity zones on the terrace plate.Joint-cutting (anticracking control seam) can be passed, but constuction joint can not be passed.

Claims (7)

1. the job practices of a large area concrete terrace, it is characterized in that: construction sequence is following:
Step 1 is divided construction flowing water section and construction partitioning slot position, and the planeness 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, and slotted line is than the short 1.2192m of terrace length and width, and the slotted line number of both direction is identical; All slotted lines equal the total length of all slotted lines on other directions at the total length of a direction; According to the FF/FL standard, confirm the planeness FF value of each flowing water section, high difference FL;
Step 2, installing of terrace side template formed triangular support bracket by terrace side template (8), main joist (9), secondary joist (10) and diagonal brace (11); Template absolute altitude suitable for reading is controlled at+0mm and-3mm in, the terrace side template is answered reserving hole, so that dowel bar inserts;
Step 3 is installed dowel bar at flowing water section intersection, and dowel bar adopts plain steel-bar, and every interval 200mm-400mm arranges one, and half is anchored at dowel bar in the plan concreting, and butter is smeared on second half surface, and it can be free to slide;
Step 4; Set up the laser smoothing appearance; The laser smoothing appearance comprises generating laser (1), laser pickoff (2) and leveling staff (3); Generating laser (1) is fixed on the concrete floor of intending construction, and the laser beam that generating laser (1) is launched forms a laser controlling plane in the rotation of plan construction flowing water section;
Step 5 is at the fixing leveling staff (3) of the edge that intends construction flowing water section;
Step 6 is fixed on laser pickoff (2) on the leveling head of laser smoothing appearance, makes the terrace absolute altitude of leveling staff (3) corresponding with the leveling head of laser smoothing appearance;
Step 7 is chosen ordnance bench mark, and terrace side template end face absolute altitude is provided with reference point, draws to connect the absolute altitude control line;
Step 8; Concreting in the space that the terrace side template surrounds; The terrace board concrete is built and is adopted thin concrete lift, incremental, the continuous placing technology that progressively evenly raises, once arrive the top, and employing inclined-plane layering is pushed ahead by the slope of 1:6 when building;
Step 9; Accomplish the vibrating of terrace, compacting and leveling work by the leveling appearance; The leveling head of leveling appearance is made up of scraper plate, cloth spiral, vibrator, leveling beam four parts; The control of terrace plate absolute altitude and planeness is that 10 times/s adjusts absolute altitude in real time automatically by the leveling Automatic Levelling that leveling appearance fluid power drives; The vibration frequency of vibrator is 3000 times/min, and the control of the twocouese gradient is accomplished by automatic controlled hydraulic system in length and breadth; Open the automatic control system of laser smoothing appearance, laser pickoff is adjusted with frequency automatic benchmarking's height, the gradient of 10 times/s according to the laser signal of sensing in real time;
Step 10 is accomplished the surfacing polishing of concrete floor before concrete final set;
Step 11, the maintenance of concrete floor;
Step 12 is carried out the joint-cutting of constuction joint (7) in 24 hours, and fills the construction partitioning slot;
Step 13 is carried out the secondary maintenance.
2. the job practices of large area concrete terrace according to claim 1 is characterized in that: carry out unwrapping wire, leveling by manual work in the scope of edge 200mm far from the wall limit of said plan construction flowing water section.
3. the job practices of large area concrete terrace according to claim 1; It is characterized in that: when said step 1, planeness detector are carried out the planeness detection, calculate each the piece test zone except that the 0.6096m boundary line; The definite percentage that will get rid of; If the area in the 0.6096m scope of boundary line surpasses 25% of the gross area, then 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 the said step 8 is produced by the commercial concrete agitator; The concrete specification: the C30 concrete, intensity was not less than 30 MPa in 28 days, and water/binder ratio is not more than 0.5; Cement adopts the Portland cement that is not less than 42.5 labels, and coarse aggregate is with broken granite or cobble, 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, and 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.
5. the job practices of large area concrete terrace according to claim 1 is characterized in that: said step 10, and the surfacing polishing branch of concrete floor is slightly smeared mill, correct grinding and is ground three phases eventually and carry out;
Corase grind is to carry out after building back 3-4h concrete initial set, adopts evenly troweling compacting repeatedly of disk, and each will treat to polish after the surface moisture evaporation all over after finishing next time again; Further scrape with floating rule simultaneously and smear leveling, should ooze out with globality screeding and compaction, the magma of area when slightly smearing is main target, and operating personnel want to wear before the pin soft sole of steel plate during corase grind;
Correct grinding is after concreting, to carry out before the concrete final set, uses two disk finishers to polish, and uses the electric grinding machine polishing; After using the disk finisher to grind, re-use the blade polishing; During each the polishing, blade should further tilt, and increases frictional force to concrete surface, makes the terrace glossiness even;
Smearing eventually is to solidify basically on preceding 1 hour its surface of concrete final set to carry out, and steps on when having only extremely slight vestige, and quality inspection personnel is checked comprehensively again, for undesirable position, smears reality with the further press polish of finisher.
6. the job practices of large area concrete terrace according to claim 1 is characterized in that: said step 11, after the 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 the people.
7. the job practices of large area concrete terrace according to claim 1; It is characterized in that: said step 12; Build the lamina membranacea extension 20mm of concrete (5) first time of said constuction joint (7); Dismantle for the first time build the lamina membranacea of concrete (5) after, excise unnecessary 20mm and builds concrete the wide first time, then carry out building the second time building of concrete (6).
CN201210198192.2A 2012-06-15 2012-06-15 Construction method for large-area concrete weighbridge CN102691401B (en)

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* Cited by examiner, † Cited by third party
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CN103114728A (en) * 2013-03-04 2013-05-22 温州建设集团有限公司 Grid construction method of large area cement wear-resisting floor
CN104234430A (en) * 2014-06-19 2014-12-24 中国建筑第四工程局有限公司 Construction method for forming concrete terraces at one step
CN104453192A (en) * 2014-11-25 2015-03-25 武汉一冶建筑安装工程有限责任公司 Laser leveling device and technology for concrete ground construction
CN104563470A (en) * 2013-10-24 2015-04-29 厦门精铎建筑科技有限公司 Concrete terrace grinding and polishing technical method
CN104712085A (en) * 2015-03-24 2015-06-17 中交一航局第四工程有限公司 Large-area wear-resistant concrete ground construction method
CN106150098A (en) * 2016-08-30 2016-11-23 中国葛洲坝集团三峡建设工程有限公司 A kind of big discrepancy in elevation slope thin layer non-fine concrete rapid constructing method
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CN107143111A (en) * 2017-06-20 2017-09-08 苏州郡茂营造工程有限公司 A kind of construction method of abrasion-proof terrace
CN107152147A (en) * 2017-06-20 2017-09-12 苏州郡茂营造工程有限公司 A kind of concrete abrasion-resistant terrace construction technique
CN107419877A (en) * 2017-07-29 2017-12-01 安徽扬子生物科技有限公司 A kind of construction technology of corrosion-resistant dustproof solidification agent floor
CN107448022A (en) * 2017-08-29 2017-12-08 中国三冶集团有限公司 A kind of food stuff refrigerated storage large area overlength method for constructing terrace based on BIM
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CN108868063A (en) * 2018-06-07 2018-11-23 上海宝冶集团有限公司 A kind of method for constructing terrace
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CN110206271A (en) * 2019-05-18 2019-09-06 陕西建工第五建设集团有限公司 A kind of concrete ultra-flat terrace cutting-free construction method
CN110295722A (en) * 2019-06-27 2019-10-01 中建三局第一建设工程有限责任公司 A kind of high-precision flooring construction method that flatness is controllable
CN110528524A (en) * 2019-09-06 2019-12-03 成都建工第一建筑工程有限公司 Volume of concrete foundation unit cellular-type construction method

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* Cited by examiner, † Cited by third party
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0737787A1 (en) * 1995-04-10 1996-10-16 N.V. Bekaert S.A. Continuous floor slab construction
CN101307640A (en) * 2008-07-12 2008-11-19 中冶京唐建设有限公司 Garage abrasion-proof concrete pavement terrace crack control method
CN201180366Y (en) * 2008-03-14 2009-01-14 中建三局建设工程股份有限公司 Ultra-large area concrete construction surface construction and partition seam remaining construction apparatus
CN101440664A (en) * 2008-11-19 2009-05-27 江苏江都建设工程有限公司 Method for controlling flatness and elevation of large area wear resistant terrace

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0737787A1 (en) * 1995-04-10 1996-10-16 N.V. Bekaert S.A. Continuous floor slab construction
CN201180366Y (en) * 2008-03-14 2009-01-14 中建三局建设工程股份有限公司 Ultra-large area concrete construction surface construction and partition seam remaining construction apparatus
CN101307640A (en) * 2008-07-12 2008-11-19 中冶京唐建设有限公司 Garage abrasion-proof concrete pavement terrace crack control method
CN101440664A (en) * 2008-11-19 2009-05-27 江苏江都建设工程有限公司 Method for controlling flatness and elevation of large area wear resistant terrace

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CN103114728A (en) * 2013-03-04 2013-05-22 温州建设集团有限公司 Grid construction method of large area cement wear-resisting floor
CN104563470A (en) * 2013-10-24 2015-04-29 厦门精铎建筑科技有限公司 Concrete terrace grinding and polishing technical method
CN104234430A (en) * 2014-06-19 2014-12-24 中国建筑第四工程局有限公司 Construction method for forming concrete terraces at one step
CN104453192A (en) * 2014-11-25 2015-03-25 武汉一冶建筑安装工程有限责任公司 Laser leveling device and technology for concrete ground construction
CN104712085A (en) * 2015-03-24 2015-06-17 中交一航局第四工程有限公司 Large-area wear-resistant concrete ground construction method
CN109154500A (en) * 2016-03-08 2019-01-04 斯塔夫控股私人有限公司 Laser leveling inspection
CN106150098A (en) * 2016-08-30 2016-11-23 中国葛洲坝集团三峡建设工程有限公司 A kind of big discrepancy in elevation slope thin layer non-fine concrete rapid constructing method
CN106150098B (en) * 2016-08-30 2019-01-01 中国葛洲坝集团三峡建设工程有限公司 A kind of big height difference slope thin layer non-fine concrete rapid constructing method
CN106836814A (en) * 2016-12-30 2017-06-13 上海建工七建集团有限公司 The control method of structure slope uniform thickness flooring absolute altitude
CN107143111A (en) * 2017-06-20 2017-09-08 苏州郡茂营造工程有限公司 A kind of construction method of abrasion-proof terrace
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CN107419877A (en) * 2017-07-29 2017-12-01 安徽扬子生物科技有限公司 A kind of construction technology of corrosion-resistant dustproof solidification agent floor
CN107448022A (en) * 2017-08-29 2017-12-08 中国三冶集团有限公司 A kind of food stuff refrigerated storage large area overlength method for constructing terrace based on BIM
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CN108049540A (en) * 2017-11-30 2018-05-18 中建六局第三建筑工程有限公司 More super flat anticracking one-pass molding load bearing heat preserving floor construction engineering methods in temperature control cold chain storehouse
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