CN103470044A - Construction method capable of controlling cracks in concrete floor - Google Patents

Abstract

The invention discloses a construction method capable of controlling cracks in a concrete floor. The method comprises the following steps of leveling and compacting the foundation soil of the floor; colligating floor reinforcements, and breaking the floor reinforcements at positions 1 to 2cm away from a vertical structure to form a bounded lattice crack; arranging a floor template in a supporting way, and simultaneously filling a flexible material into the bounded lattice crack; pouring floor concrete, and taking out the flexible material filled in the bounded lattice crack after maintenance; after the floor concrete is uniformly settled, pouring concrete into the bounded lattice crack, and performing maintenance. According to the construction method, the flexible material is arranged at a joint of the floor and the vertical structure, and can be used for disconnecting the floor from the vertical structure, so that the cracks caused by the non-uniform settlement of the floor and the vertical structure are prevented, and the construction quality and the attractive appearance of the floor are improved; the construction method is easy to operate, convenient to construct and high in construction speed; the flexible material is used for disconnecting, and is light in self weight and convenient to use, so that convenience is brought to construction.

Description

A kind of job practices of controlling the concrete floor crack

Technical field

The present invention relates to the concrete pavement method, specifically, relate to the processing method at the handing-over positions such as concrete floor and concrete column.

Background technology

All use the concreting terrace in the industrial construction factory building at present, and, in floor construction, crack is one of common quality defect.Wherein in the construction factory building, during the large tracts of land terrace, often can occur that near the terrace vertical structure external corners such as concrete column, equipment Foundations the handing-over line of ，Gai crack, crack and terrace and vertical structure is 135 ° of left and right angles, so be called as 45 ° of cracks.

The control work of carrying out crack is particularly important, and when the large tracts of land terrace is constructed, traditional job practices is that terrace be take to 6*6m as unit usually, and partition seam is done in centre, its objective is and prevents from causing producing crack because the terrace area is excessive.But at present floor construction is never taked control measure to 45 ° of cracks specially, thus the phenomenon in terrace and 45 ° of cracks of appearance, vertical structure junction such as concrete column, equipment Foundations usually occurs, thus have a strong impact on the attractive in appearance of on-the-spot quality and terrace.

Summary of the invention

What the present invention will solve is the easy technical problem that produces 45 ° of cracks of negative and positive angle intersection of concrete floor and vertical structure, and a kind of job practices of controlling the concrete floor crack is provided, and can prevent the generation in 45 ° of cracks.

In order to solve the problems of the technologies described above, the present invention is achieved by following technical scheme:

A kind of job practices of controlling the concrete floor crack, this job practices is carried out in accordance with the following steps:

(1) the terrace foundation soil is smooth, compacting;

(2) colligation terrace reinforcing bar, described terrace reinforcing bar disconnects at distance vertical structure 1-2cm place, makes between described terrace reinforcing bar and vertical structure to form boundary's lattice seam;

(3) install the terrace template, simultaneously filling flexible material in described boundary lattice seam;

(4) build the terrace concrete;

(5), after the terrace concrete curing completes, the flexible material of filling in described boundary lattice seam is taken out;

(6) after terrace concrete Equalsettlement, concreting maintenance in described boundary lattice seam.

Described flexible material is selected polyethylene foam sheet.

The invention has the beneficial effects as follows:

In the junction of terrace and vertical structure, flexible material is set during construction, flexible material can disconnect terrace and vertical structure, thereby prevent the crack that the sedimentation inequality due to terrace and vertical structure causes, improve construction quality and terrace aesthetics, simple to operate, easy construction, speed of application is fast, and adopts flexible material as partition, and the flexible material dead weight is light, the convenient use, constructability.

The accompanying drawing explanation

Fig. 1 is the job practices schematic diagram in control concrete floor provided by the present invention crack;

Fig. 2 is the cross sectional view of Fig. 1;

Fig. 3 is the construction sequence schematic diagram of placing polyethylene foam sheet.

In figure: 1: terrace; 2: boundary's lattice seam; 3: concrete column; 4: the terrace reinforcing bar.

The specific embodiment

The present invention is described in further detail as example below to take certain workshop floor construction, and following examples can make those skilled in the art more fully understand the present invention, but do not limit the present invention in any way.

The present embodiment discloses the job practices in a kind of concrete floor processed crack, the integral construction process be foundation soil smooth → reinforcing bar binding, template install → place flexible material → concreting at concrete column 3 places, vibrate → floating rule, rolling bar levelling → machinery is carried slurry → mechanical polishing → maintenance → taking-up flexible material → concreting, specific as follows.Wherein, wherein flexible material refers to the low and material of inextensibility of intensity, and as pitch, malthoid, polyethylene foam sheet etc., following examples select polyethylene foam sheet as flexible material, but flexible material of the present invention is not limited to this.

1. foundation soil compacting, levelling

Terrace 1 foundation soil is smooth, smooth with rammer, the earthwork is tamped afterwards.Survey the absolute altitude of establishing according to level gauge, look for the height of terrace 1 foundation soil, till being adjusted to design elevation.

2. colligation terrace reinforcing bar 4

Disconnect in terrace reinforcing bar 4 and the position of concrete column 3 apart from 2cm, make between terrace reinforcing bar 4 and concrete column 3 to form boundary's lattice seam.

3. slideway is installed

At 500mm place, distance terrace edge ground way, slideway is arranged in parallel according to the concreting direction is elongated, and spacing is 6000mm, and must install by hanging wire, makes it straight.

4. install the terrace template.

5. placement polyethylene foam sheet

Place polyethylene foam sheet in boundary's lattice seam, and withstand polyethylene foam sheet with terrace reinforcing bar 4, fix polyethylene foam sheet with this, as Fig. 3.

6. concreting and vibrating

(1) concrete building, take layering to overlap the method for continuous placing, strictly controls the appearance of concrete construction joint, avoids occurring cold seam phenomenon;

(2) time of concrete delamination overlap joint was controlled in 90 minutes;

(3), during concrete vibrating, vibrating spear should accomplish that fast inserting pull out slowly, guarantees concrete density;

(4) concrete vibrating adopts the plug-in type vibrating rod, and the spacing plugged and pounded should be even, and its spacing is not more than 1.5 times of terrace 1 thickness;

(5) concrete vibration time is unsuitable long too short, and general every some time of vibration, at 20～30s, no longer sinks to being advisable without obvious bubble and laitance with concrete surface;

(6) bleeding occurred in the concrete vibrating process, should get rid of.

7. rolling bar, floating rule levelling

(1) concrete surface after vibrating, a little more than terrace 1 design elevation 5～10mm, guarantees that the concrete surface after levelling is full, and the polishing, the essence that are beneficial to concrete floor 1 are flat;

(2) floating rule adopts the long aluminium alloys chi of 6m, by two operators, controls the floating rule two ends, is close to the steel pipe top rubbing levelling back and forth of slideway, and levelling must edge be built direction and retreated and carry out, in case leave footprints; Then with rolling bar, roll back and forth, the compacting levelling.

8. machinery is carried slurry

After concrete initial set, first with the steel disk trowelling machine that has been equipped with, in direction levelling in length and breadth, carry slurry, circulate twice; When slurry carried in levelling, and mechanically actuated personnel Ying Bian carries the slurry limit and retreats (along the concreting direction), in case leave a trace, wait for after the concrete initial set sclerosis polished again, smart flat operation.

9. the mechanical polishing essence is flat

(1), after concrete surface is carried slurry, according to concrete coagulating time and hardening of concrete situation, determine whether that the polishing essence is flat.Work as concrete initial set, and reach in the situation of certain degree of hardness (operating personnel stand up concrete surface without the footprint that sink), carry the surface of slurry at concrete floor 1, removal steel disk, mechanical spatula on employing equipment is carried out the polishing of direction in length and breadth to concrete surface, generally polishes 2-3 time.Make concrete surface fine and close, smooth, bright and clean;

(2), during the concrete surface mechanical polishing, machinery operator is answered while smearing and is moved back, and must wear flat soft footwear, in case leave footprints;

(3) operation of floating machinery must be carried out continuously, and operating process should be accomplished without any letup, must not be paused.

10. maintenance, finished product protection

(1) after concrete polishing essence is put down, adopt Polypropylence Sheet to do the maintenance covering layer, the natural curing time is generally more than 7d;

(2) the finished product protection stage, periphery arranges red white alarm flag, and special messenger nurse, prevents from that construction machinery and constructor are strayed into to trample.

11. take out boundary's lattice seam 2 between concrete column 3 and terrace 1 interior polyethylene foam sheet.

12. build the concrete in boundary's lattice seam 2.

Although the above is described the preferred embodiments of the present invention by reference to the accompanying drawings; but the present invention is not limited to the above-mentioned specific embodiment; the above-mentioned specific embodiment is only schematic; be not restrictive; those of ordinary skill in the art is under enlightenment of the present invention; not breaking away from the scope situation that aim of the present invention and claim protect, can also make the concrete conversion of a lot of forms, within these all belong to protection scope of the present invention.

Claims (2)

1. a job practices of controlling the concrete floor crack, is characterized in that, this job practices is carried out in accordance with the following steps:

(1) the terrace foundation soil is smooth, compacting;

(2) colligation terrace reinforcing bar, described terrace reinforcing bar disconnects at distance vertical structure 1-2cm place, makes between described terrace reinforcing bar and vertical structure to form boundary's lattice seam;

(3) install the terrace template, simultaneously filling flexible material in described boundary lattice seam;

(4) build the terrace concrete;

(5), after the terrace concrete curing completes, the flexible material of filling in described boundary lattice seam is taken out;

(6) after terrace concrete Equalsettlement, concreting maintenance in described boundary lattice seam.

2. a kind of job practices of controlling the concrete floor crack according to claim 1, is characterized in that, described flexible material is selected polyethylene foam sheet.

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