CN113622659B - Construction method and structure for corridor clear water concrete column - Google Patents
Construction method and structure for corridor clear water concrete column Download PDFInfo
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- CN113622659B CN113622659B CN202110940563.9A CN202110940563A CN113622659B CN 113622659 B CN113622659 B CN 113622659B CN 202110940563 A CN202110940563 A CN 202110940563A CN 113622659 B CN113622659 B CN 113622659B
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G13/00—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills
- E04G13/02—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills for columns or like pillars; Special tying or clamping means therefor
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/30—Columns; Pillars; Struts
- E04C3/34—Columns; Pillars; Struts of concrete other stone-like material, with or without permanent form elements, with or without internal or external reinforcement, e.g. metal coverings
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
- E04G21/06—Solidifying concrete, e.g. by application of vacuum before hardening
- E04G21/08—Internal vibrators, e.g. needle vibrators
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Abstract
The invention provides a construction method and a structure for a corridor clear water concrete column, belonging to the technical field of corridor clear water concrete column construction, wherein the construction method S1 for the corridor clear water concrete column comprises the following steps: according to the requirements of construction drawings, constructing a main keel and a secondary keel in the identified construction area; wherein, S11, main, secondary keel is built: according to the requirements of construction drawings, the main keels are perpendicular to the ground or a floor surface, the secondary keels are sequentially and horizontally arranged at equal intervals along the main keels to form a support frame, and a plurality of support frames are surrounded into a geometric installation space; according to the construction method, a reasonable construction scheme is formed through comparison, building energy conservation and material conservation are met, each construction node is subjected to fine management in the optimization of the construction scheme, energy resources are saved and recycled, and the construction quality and the construction progress can be improved.
Description
Technical Field
The invention belongs to the technical field of corridor fair-faced concrete column construction, and particularly relates to a construction method and a structure for a corridor fair-faced concrete column.
Background
The bare concrete process is a new process which improves the traditional process and construction method, so that the surface of the concrete is flat and smooth, the color is uniform, the lines are smooth, and the common quality problems in the traditional concrete construction are eliminated. The clear concrete structure is formed by one-step molding of concrete without any external decoration, the natural color of the concrete is directly used as a veneer, the splicing traces of the template have regularity, the surface is smooth, and the defects of honeycomb, pitted surface, exposed ribs, flat slag, pulverization, rust spots, bubbles and the like are not obvious; the structure has no missing edge and corner, the joints of the beam and the column are smooth and square, and the joint has no obvious trace; the surfaces of the embedded part and the embedded bolt sleeve are smooth, and the size is accurate; the positions of the split bolts are arranged orderly, and the splicing seams of the templates are regular.
However, the construction of the clear water concrete wall of the corridor at present has the following problems:
1. the bare concrete has high cost: to achieve the effect of the finish-faced fair-faced concrete, corresponding construction measures must be taken, for example, the quality of a template, especially the quality of a panel, must be guaranteed, the fair-faced concrete with high performance is adopted, and a special steam curing method and finished product protection measures are taken after the concrete construction is finished.
2. The quality and the construction period have high requirements: the bare concrete construction requirement is more precise and strict, compared with the common concrete construction, a large amount of preliminary planning and construction preparation are needed, and the construction period arrangement is more compact and time-consuming.
Disclosure of Invention
The embodiment of the invention provides a construction method and a structure for a corridor fair-faced concrete column, and aims to solve the problems of high cost and high requirements on quality and construction period of fair-faced concrete constructed by the conventional corridor fair-faced concrete column.
In view of the above problems, the technical solution proposed by the present invention is:
the construction method for the clear water concrete column of the corridor comprises the following steps:
s1, erecting a support frame: according to the requirements of construction drawings, constructing a main keel and a secondary keel in the identified construction area;
wherein, S11, main, secondary keel is built: according to the requirements of construction drawings, the main keels are perpendicular to the ground or a floor surface, the secondary keels are sequentially and horizontally arranged at equal intervals along the main keels to form a support frame, and a plurality of support frames are surrounded into a geometric installation space;
s12, fastening the main keel and the secondary keel: the main keels and the secondary keels are fixed by using secondary beam bolt clamps to form a support frame, and two adjacent secondary keels positioned at corners are fixed through corner connecting pieces;
s2, template processing and mounting: selecting and manufacturing raw materials of the template according to the requirements of a construction drawing, hoisting a finished template to a construction site after finishing the selection and manufacturing, and hoisting the finished template into a geometric installation space according to the construction progress for installation;
s21, selecting the template raw material: the template is a special film-coated template with the thickness of 20mm and high-quality clear water;
s22, template processing: obtaining the number of the special clear water film-coated templates with different specifications according to the processing drawing and the field installation drawing of the special clear water film-coated template, cutting the templates with different specifications in a suit manner by using a precision saw, performing sealing glue treatment on newly cut positions of the cut templates, performing joint grinding and finish machining on the clear water decorative surfaces of the cut templates, and brushing varnish for preventing moisture and stacking the templates in order after the joint grinding and forming are performed and numbering the templates;
s23, template installation: construction preparation is prepared in advance in the template installation process, and during construction, the template is hoisted into a geometric installation space and is installed according to the installation sequence;
s3, processing and installing steel bars: processing a corresponding number of reinforcing steel bars according to the requirements of a construction drawing, and conveying the reinforcing steel bars to a geometric installation space for installation;
s31, steel bar lofting: a professional lofting worker lofts the reinforcing steel bars according to the construction drawing, and BIM software is needed to deeply loft the reinforcing steel bars using complex parts;
s32, processing and manufacturing the steel bar: before the reinforcing steel bar is processed, oil stain, paint stain, floating skin and the like on the surface of the reinforcing steel bar are removed, the surface of the cleaned reinforcing steel bar is coated with a reinforcing steel bar rust inhibitor twice, the reinforcing steel bar with the corresponding number is processed by different mechanical equipment according to the requirements of construction drawings, and the finished reinforcing steel bar products which are processed and formed are orderly stacked in batches and in stages to be marked;
s33, entrance binding: conveying the finished reinforcing steel bar into the geometric installation space, and binding in the geometric installation space in a binding manner;
s4, preparing fair-faced concrete: carrying out raw material model selection by combining the environmental conditions of a construction site and construction drawings, calculating a corresponding mix proportion to manufacture a visual sample plate, adopting the mix proportion conforming to the standard visual sample plate, and providing the mix proportion to a commercial concrete station for preparation;
s5, pouring clear concrete: the prepared fair-faced concrete is conveyed to a construction site through a commercial concrete vehicle, and is unfolded to the geometric installation space by using concrete pouring equipment for pouring the fair-faced concrete;
s51, before casting: paying attention to local weather and checking the site conditions of the steel bars and the templates, and checking the slump by a special person after the clear concrete is conveyed to a construction site;
s52, when pouring, pouring the fair-faced concrete, taking the corner as a starting point, pouring cement mortar with the thickness of 50-100 mm and the same as the component of the fair-faced concrete at the root, uniformly placing the cement mortar into a mold by using shovels, and controlling the thickness of the layered thickness by using a scale rod, wherein the pouring thickness of each layer of the fair-faced concrete is strictly controlled within 800 mm;
s6, vibrating fair-faced concrete: when concrete is poured, a vibrating rod is used for vibrating the concrete;
s7, leveling the upper opening: after pouring the fair-faced concrete, arranging the steel bars thrown out of the top of the geometric installation space, adding the fair-faced concrete by using a wooden trowel according to a standard height line, leveling the fair-faced concrete positioned at the top of the geometric installation space, and controlling the height difference within 10 mm;
s8, template stripping: after the bare concrete in the geometric installation space is cured, the external support frame and the template are removed;
s9, curing the bare concrete: and adhering a film on the cured wall surface for curing.
As a preferred embodiment of the present invention, the construction preparation in step S23 is: construction paying-off → the templates are fixed with the supporting frames through the E-shaped beams, hidden inspection is carried out, sundries at the positions where the fair-faced concrete needs to be poured are cleaned → the positions between the opposite supporting frames are positioned by using PVC sleeves, embedded parts are installed → template accessories are installed, release agents are coated on the templates, a construction operation platform is erected → a template control line is rechecked, and mortar is used for leveling the ground or the floor surface.
As a preferred technical solution of the present invention, the installation sequence in step S23 is: according to the construction paying-off and template numbering, the prepared templates are hoisted into the place → the two adjacent templates are positioned at the PVC sleeve and are provided with matched arc-shaped grooves, the arc-shaped grooves of the templates are adjusted to be matched with the PVC sleeve, a special cushion block is arranged between the templates and the support frame, a fastening split bolt penetrates through the special cushion block to be connected with the PVC sleeve to preliminarily fix the templates → a double-sided adhesive tape is pasted between the adjacent templates, a long steel nail is used for fixing → the template is adjusted to be vertical, E-shaped steel is arranged between the templates and the support frame through a spliced seam, the E-shaped steel and the templates are fixed through a self-tapping screw, the template supporting condition is checked, and the local part is reinforced according to the node requirement.
As a preferred technical solution of the present invention, the binding manner in step S33 is: the installation space around the geometry is equidistant installation vertical bars to form a reinforcement binding space, the vertical bars are perpendicular to the ground or the floor surface → the galvanized rust-proof binding wires are utilized to fix the vertical bars and the template → the horizontal bars are bound between two adjacent vertical bars → the vertical bars are equidistant installation in the reinforcement binding space, and the horizontal bars are bound between two adjacent vertical bars.
As a preferred technical solution of the present invention, in the step S4, the raw materials are water, cement, fly ash, sand, stone, and an additive.
As a preferred technical scheme of the invention, the raw materials are mixed in the following ratio of water 165: 280-300 parts of cement: 100-120 parts of fly ash: 0 part of mineral powder: sand 828: stone 1057: 5.2 of additive.
In a preferred embodiment of the present invention, in step S6, the moving distance of the vibrating rods is less than or equal to 500 mm.
As a preferable technical solution of the present invention, in the step S6, the vibrating time of the vibrating rod is controlled between 20S and 30S.
On the other hand, the invention also provides a structure for the corridor fair-faced concrete column, which comprises a support frame constructed by a main keel and secondary keels, wherein the main keel is vertical to the ground or a floor surface, the secondary keels are sequentially and horizontally arranged along the main keel at equal intervals, the main keel is fixedly connected with the secondary keels through secondary beam bolt clamps, a plurality of support frames can surround a geometric installation space, PVC sleeves are arranged between the opposite support frames, templates are sequentially installed in the installation space from bottom to top, the opposite surfaces of two adjacent templates are provided with arc-shaped grooves, the arc-shaped grooves are matched with the surfaces of the PVC sleeves, a special cushion block is arranged between the support frames and the templates, one side of the support frames, far away from the templates, penetrates through the special cushion block through fastening counter-pulling bolts and is in threaded connection with the PVC sleeves, two adjacent the eclipsed face of template is pasted and is had two-sided adhesive tape to fasten it with long steel nail, the template with be provided with E shaped steel between the support frame, E shaped steel with through self tapping screw fixed connection between the template, center on fixedly connected with indulges the muscle in the installation space, just it is perpendicular with ground or floor face to indulge the muscle, adjacent two it has horizontal muscle through the rust-resistant ligature of bundling of zinc-plating between the muscle to indulge.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the construction method, the raw material mixing ratio is obtained by carrying out fine calculation and repeated tests to manufacture the visual sample plate according to the environment of the construction site, the using amount of the bare concrete used in construction is obtained according to the mixing ratio, and the aim of saving energy and reducing materials can be fulfilled by accurately controlling the construction link.
(2) According to the construction method, a reasonable construction scheme is formed through comparison, energy conservation and material conservation of buildings are met, each construction node is managed finely in the optimized construction scheme, energy resources are saved and recycled, and the construction quality and the construction progress can be improved.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
FIG. 1 is a flow chart of the disclosed construction method for a corridor fair-faced concrete column;
FIG. 2 is a schematic structural diagram of a step S2 of the construction method for the corridor fair-faced concrete column disclosed by the invention;
FIG. 3 is an enlarged view of a portion of FIG. 2 at A;
fig. 4 is a schematic structural diagram of a step S3 of the construction method for the corridor fair-faced concrete column disclosed by the invention.
Description of the reference numerals: 1. a support frame; 1a, a main keel; 1b, secondary keel; 2. an installation space; 3. a template; 4. e-shaped steel; 5. PVC sleeves; 6. fastening the split bolts; 7. a special cushion block; 8. a double-sided adhesive tape; 9. a long steel nail; 10. self-tapping screws; 11. longitudinal ribs; 12. and transverse ribs.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without inventive efforts based on the embodiments of the present invention, are within the scope of protection of the present invention.
Thus, the following detailed description of the embodiments of the present invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined or explained in subsequent figures.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Example one
Referring to the attached drawings 1-4, the invention provides a technical scheme: the construction method for the clear water concrete column of the corridor comprises the following steps:
s1, erecting a support frame: and according to the requirements of construction drawings, constructing a main keel and a secondary keel in the identified construction area.
In this embodiment, the steps are:
s11, constructing a main keel and a secondary keel: according to the requirements of construction drawings, the main keels are perpendicular to the ground or floor surfaces, the secondary keels are sequentially and horizontally arranged at equal intervals along the main keels to form a support frame, and a plurality of support frames are enclosed to form a geometric installation space.
It should be noted that the geometric installation space surrounded by the support frame may be square, rectangular, circular or L-shaped, and is mainly formed according to the construction between walls in the construction drawing, and therefore, detailed description thereof is omitted.
S12, fastening the main keel and the secondary keel: the main keels and the secondary keels are fixed by using secondary beam bolt clamps to form a support frame, and two adjacent secondary keels positioned at the corners are fixed through corner connecting pieces;
s2, template processing and installation: and selecting and manufacturing the raw materials of the template according to the requirements of a construction drawing, hoisting the finished template to a construction site after the selection and the manufacturing are finished, and hoisting the finished template into a geometric installation space according to the construction progress for installation.
In this embodiment, the steps are:
s21, selecting the template raw material: the template should adopt a special film-coated template with the thickness of 20mm and high-quality clear water.
In order to ensure the decorative surface characteristics of the fair-faced concrete, the processing needs to pay attention to whether a special film-coated template for the fair-faced concrete is flat or not, whether the template is damaged or not, whether the surface of the template has dark marks or not, whether a clamping plate has gaps or distortion or not, whether the edge is neat or not, whether the thickness and the shape meet the requirements or not.
S22, template processing: obtaining the number of the special clear water film-coated templates with different specifications according to the processing drawing of the special clear water film-coated template and the field installation drawing, cutting the templates with different specifications by a precision saw, sealing glue at the newly cut positions of the cut templates, finishing the finished clear water finish surfaces of the cut templates by joint grinding, brushing varnish for preventing moisture and numbering after joint grinding and forming, and orderly stacking.
S23, template installation: construction preparation should be prepared in advance in the formwork installation process, the formwork is hoisted into a geometric installation space during construction, and installation is completed according to the installation sequence.
Wherein the construction preparation in the step S23 is: construction paying-off → the templates are fixed with the supporting frames through the E-shaped beams, hidden inspection is carried out, sundries at the positions where the fair-faced concrete needs to be poured are cleaned → the positions between the opposite supporting frames are positioned by using PVC sleeves, embedded parts are installed → template accessories are installed, release agents are coated on the templates, a construction operation platform is erected → a template control line is rechecked, and mortar is used for leveling the ground or the floor surface.
The release agent is water-emulsion, and the ratio of the release agent to the release agent is 1: 10, diluting and uniformly brushing the surface of the cleaned template.
In addition, the installation sequence in step S23 is: according to the construction paying-off and template numbering, the prepared templates are hoisted into the place → the two adjacent templates are positioned at the PVC sleeve and are provided with matched arc-shaped grooves, the arc-shaped grooves of the templates are adjusted to be matched with the PVC sleeve, a special cushion block is arranged between the templates and the support frame, a fastening split bolt penetrates through the special cushion block to be connected with the PVC sleeve to preliminarily fix the templates → a double-sided adhesive tape is pasted between the adjacent templates, a long steel nail is used for fixing → the template is adjusted to be vertical, E-shaped steel is arranged between the templates and the support frame through a spliced seam, the E-shaped steel and the templates are fixed through a self-tapping screw, the template supporting condition is checked, and the local part is reinforced according to the node requirement.
When the template is loaded in and unloaded from a field, the template is horizontally lifted away from a vehicle, and a pad purlin or an angle steel corner protector is additionally arranged at the contact part of the lifting rope and the template, so that the panel is prevented from being damaged by the lifting rope, two lifting ropes can be lifted, the lifting point position is acted on the back edge position, and four lifting points are ensured and are uniformly stressed. When the template is hoisted, a steel wire rope needs to be hung at the position of a lifting hook, the stable connection of a hoisting point is ensured before hoisting, the template panel is prevented from being hooked on an aluminum beam or a back ridge strictly, the template panel cannot be contacted with the ground, and when necessary, sponge is padded at the position of the heel of the template. And if the template is not suitable to be hoisted above the grade four wind, a person is placed below the template to be dragged by a rope to ensure that the template is smoothly positioned in the mold, and the lower opening of the template is prevented from colliding and rubbing with a concrete wall body to prevent flash.
S3, processing and installing steel bars: and processing a corresponding number of reinforcing steel bars according to the requirements of the construction drawing, and conveying the reinforcing steel bars to a geometric installation space for installation.
In this embodiment, the steps are:
s31, steel bar lofting: and (4) lofting the reinforcing steel bars by a professional lofting worker according to the construction drawing, wherein BIM software is required to be adopted for deepening the lofting of the reinforcing steel bars using complex parts.
S32, processing and manufacturing the steel bars: oil stain, paint stain and floating skin on the surface of the steel bar are removed completely before the steel bar is processed, the steel bar surface which is cleaned completely is coated with a steel bar rust inhibitor twice, the steel bars with corresponding quantity are processed and processed through different mechanical equipment according to the requirements of construction drawings, and the finished steel bars which are processed and formed are orderly stacked in batches and in stages to form a tag label.
S33, entrance binding: and conveying the finished reinforcing steel bar products into the geometric installation space, and binding in the geometric installation space in a binding mode.
Wherein, the binding mode in the step S33 is as follows: the method comprises the steps of installing longitudinal bars at equal intervals around a geometric installation space to form a steel bar binding space, enabling the longitudinal bars to be perpendicular to the ground or a floor surface → fixing the longitudinal bars and a template by using galvanized rust-proof binding wires → binding transverse bars between two adjacent longitudinal bars → installing the longitudinal bars at equal intervals in the steel bar binding space, and binding the transverse bars between two adjacent longitudinal bars.
S4, preparing fair-faced concrete: and (3) carrying out raw material model selection by combining the environmental conditions of the construction site and the construction drawing, calculating a corresponding mixing ratio to manufacture a visual sample plate, adopting the mixing ratio conforming to the standard visual sample plate, and providing the mixing ratio for a commercial concrete station for preparation.
In the step S4, the raw materials include water, cement, fly ash, sand, stone and an additive, and the raw materials include water 165: 280-300 parts of cement: 100-120% of fly ash: 0 part of mineral powder: sand 828: stone 1057: 5.2 of additive.
The bare concrete is preferably made of Portland cement or ordinary Portland cement which is produced by the same manufacturer and has the strength grade not lower than 42.5 by adopting a rotary kiln, the 28d mortar strength is not lower than 48.0MPa, the ordinary Portland cement with good crack resistance is preferably selected on the premise that the performance meets the requirement, and the requirement of a clean slurry cracking sensitivity test is more than 200 min.
The selected cement should meet the minimum requirements of the current cement standards. In addition, the following requirements should be selectively made to the cement according to the engineering requirements:
(1) in general, the specific surface area of the Portland cement and the ordinary Portland cement is less than or equal to 350m2Per kg, the screen residue of other general Portland cement square hole sieves with the diameter of 45 mu m is more than or equal to 35.0 percent;
(2) limitation of alkali content in cement: when the member has higher crack resistance, if mineral admixture is not blended, the alkali content of the portland cement should be less than or equal to 0.60 percent and is not less than 0.3 percent.
(3) The cement temperature during the mixing of concrete is no more than 60 ℃.
(4) The water consumption for the standard consistency of the cement is not more than 27 percent.
(5) C in cement mineral3S content is less than or equal to 55%, C3A≤6％。
The fair-faced concrete is preferably I-grade fly ash; when the class II fly ash is adopted, the mixing amount of the class II fly ash should not exceed 60kg/m3Adding a tackifying component to adjust the viscosity of the slurry; grade III fly ash must not be used.
The admixture adopted by the fair-faced concrete selects a polycarboxylic acid water reducing agent synthesized by copolymerization of main and side molecular chain structures, and composite functions of high-efficiency water reduction, low air content, retardation, plastic retention and the like are realized by a synthesis technology, and the admixture has good compatibility with raw materials. And a polycarboxylic acid high-performance water reducing agent which does not change the color of the fair-faced concrete is adopted, and the water reducing rate is not less than 25%. When the dosage of the cementing material of the fair-faced concrete is low, thickening components such as methyl cellulose ether or polyacrylamide are preferably added during the synthesis of the water reducing agent, and the adding amount is determined according to tests.
The following steps can be adopted for calculating the mixing ratio of the raw materials:
(1) the composition and the water-to-gel ratio of the cementitious material are selected.
The composition of the cementing material is determined according to the requirements of the fair-faced concrete engineering, such as strength, workability, environmental temperature and humidity, structural form, durability, material cost and the like.
(2) And calculating the dosage of the cementing material.
(3) Calculating the water consumption and the additive of the single component.
The water consumption can be calculated according to the water-gel ratio and the use amount of the cementing material.
(4) The volume of the stone is selected.
The stones in the ready-mixed fair-faced concrete are in a suspension state, the occupied volume change range is small, and the volume of each square of fair-faced concrete stones can be selected by looking up a table.
(5) And calculating the dosage of the sand and the stone.
After the composition of the rubber material, the water-rubber ratio and the using amount of the cementing material are determined, the water consumption can be obtained, and the volume of the slurry can be obtained according to the density. Selecting the volume of stone, and then 1m3The slurry volume, the stone volume and the gas volume are subtracted to obtain the sand volume. 1m3The fair-faced concrete is the sum of the volume of a cementing material, the volume of single water, the volume of sand and the volume of stone and gas, and 1m is set3The air in the fair-faced concrete is delta L, and the calculation formula is as follows:
VC+VFa+VGGBS+VW+VS+VG+δ＝1m3
in the formula: vCVolume of cement, m3；VFaVolume of fly ash, m3；VGGBSVolume of ore dust, m3；VWVolume of water, m3；VSVolume of sand, m3；VGVolume of stone, m3。
When the stone content of the sand is more than 10 percent, and more than 50 percent of the stone is added, the stone is correspondingly reduced, and the sand is correspondingly increased.
S5, pouring clear water concrete: the prepared fair-faced concrete is transported to a construction site through commercial concrete vehicles, and is spread to a geometric installation space for pouring the fair-faced concrete by using concrete pouring equipment.
In this embodiment, the steps are:
s51, before casting: paying attention to local weather and checking the field condition of the steel bars and the templates, and checking the slump by a special person after the clear concrete is conveyed to a construction field.
S52, when pouring, pouring the fair-faced concrete, taking the corner as the starting point, pouring cement mortar with the thickness of 50-100 mm and the same composition as that of the fair-faced concrete at the root, uniformly placing the cement mortar into a mold by using shovels, and controlling the thickness of the layered thickness by using a scale rod, wherein the pouring thickness of each layer of the fair-faced concrete is strictly controlled within 800 mm.
In addition, in the process of pouring the fair-faced concrete, a specially-assigned person inspects the longitudinal ribs, the transverse ribs, the template and the support frame, and the clear-faced concrete is adjusted and repaired immediately once the clear-faced concrete is displaced, deformed or loosened.
S6, vibrating the bare concrete: when concrete is poured, the concrete should be vibrated by using a vibrating rod.
Wherein, in the step S6, the moving distance of the vibrating rod is less than or equal to 500 mm; and in the step S6, the vibrating time of the vibrating rod is controlled to be between 20S and 30S.
In addition, in the vibrating process, the template, the longitudinal ribs and the transverse ribs are prevented from being pried and vibrated, and the vibration time of each vibrating point is determined until no bubble escapes as the surface of the fair-faced concrete does not sink any more.
S7, leveling the upper opening: after the clear water concrete is poured, arranging the steel bars thrown out of the top of the geometric installation space, adding and reducing the clear water concrete by using a wooden trowel according to a standard height line, leveling the clear water concrete positioned at the top of the geometric installation space, and controlling the height difference within 10 mm.
S8, template stripping: and after the fair-faced concrete in the geometric installation space is cured, the external support frame and the template are removed.
And (3) removing the template when the strength of the concrete sample reaches 3MPa under the same condition, and if the strength is not less than 4MPa in the winter period, maintaining in time after removing the template so as to reduce the phenomena of chromatic aberration, shrinkage cracks and the like on the surface of the concrete.
S9, curing the bare concrete: and adhering a film on the cured wall surface for curing.
Example two
Referring to the attached drawings 2-4, the embodiment of the invention also provides a structure for the corridor fair-faced concrete column, which comprises supporting frames constructed by main keels and secondary keels, wherein the main keels are perpendicular to the ground or floor surface, the secondary keels are sequentially and horizontally arranged along the main keels at equal intervals, the main keels and the secondary keels are fixedly connected through secondary beam bolt clamps, a plurality of supporting frames can surround a geometric installation space, PVC sleeves are arranged between the opposite supporting frames, templates are sequentially installed in the installation space from bottom to top, the opposite surfaces of every two adjacent templates are provided with arc-shaped grooves, the arc-shaped grooves are matched with the surfaces of the PVC sleeves, special cushion blocks are arranged between the supporting frames and the templates, one side of each supporting frame, which is far away from the template, penetrates through the special cushion blocks through fastening counter-pulling bolts and is in threaded connection with the PVC sleeves, two adjacent the eclipsed face of template is pasted and is had two-sided adhesive tape to fasten it with long steel nail, the template with be provided with E shaped steel between the support frame, E shaped steel with through self tapping screw fixed connection between the template, center on fixedly connected with indulges the muscle in the installation space, just it is perpendicular with ground or floor face to indulge the muscle, adjacent two it has horizontal muscle through the rust-resistant ligature of bundling of zinc-plating between the muscle to indulge.
One or more technical solutions in the embodiments of the present application have at least one or more of the following technical effects:
(1) according to the construction method, the visual sample plate is manufactured through precise calculation and repeated tests according to the environment of a construction site to obtain the mixing ratio of the raw materials, the using amount of the bare concrete used in construction is obtained through the mixing ratio, the control is accurate in the construction link, and the purposes of energy conservation and material reduction can be achieved.
(2) According to the construction method, a reasonable construction scheme is formed through comparison, building energy conservation and material conservation are met, each construction node is subjected to fine management in the optimization of the construction scheme, energy resources are saved and recycled, and the construction quality and the construction progress can be improved.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made to the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The construction method for the clear water concrete column of the corridor is characterized by comprising the following steps:
s1, erecting a support frame: according to the requirements of construction drawings, constructing a main keel and a secondary keel in the identified construction area;
wherein, S11, main, secondary keel is built: according to the requirements of construction drawings, the main keels are perpendicular to the ground or a floor surface, the secondary keels are sequentially and horizontally arranged at equal intervals along the main keels to form a support frame, and a plurality of support frames are surrounded into a geometric installation space;
s12, fastening the main keel and the secondary keel: the main keels and the secondary keels are fixed by using secondary beam bolt clamps to form a support frame, and two adjacent secondary keels positioned at the corners are fixed through corner connecting pieces;
s2, template processing and installation: selecting and manufacturing raw materials of the template according to the requirements of a construction drawing, hoisting a finished template to a construction site after finishing the selection and manufacturing, and hoisting the finished template into a geometric installation space according to the construction progress for installation;
s21, selecting the template raw material: the template is a special film-coated template with the thickness of 20mm and high-quality clear water;
s22, template processing: obtaining the number of the special clear water film-coated templates with different specifications according to the processing drawing and the field installation drawing of the special clear water film-coated template, cutting the templates with different specifications in a suit manner by using a precision saw, performing sealing glue treatment on newly cut positions of the cut templates, performing joint grinding and finish machining on the clear water decorative surfaces of the cut templates, and brushing varnish for preventing moisture and stacking the templates in order after the joint grinding and forming are performed and numbering the templates;
s23, template installation: construction preparation is prepared in advance in the template installation process, the template is hoisted into a geometric installation space during construction, and installation is completed according to the installation sequence;
s3, processing and installing steel bars: processing a corresponding number of reinforcing steel bars according to the requirements of construction drawings, and conveying the reinforcing steel bars to a geometric installation space for installation;
s31, steel bar lofting: a professional lofting worker lofts the reinforcing steel bars according to the construction drawing, and BIM software is required to deeply loft the reinforcing steel bars using complex parts;
s32, processing and manufacturing the steel bar: before the reinforcing steel bar is processed, oil stain, paint stain and floating skin on the surface of the reinforcing steel bar are removed, the cleaned surface of the reinforcing steel bar is coated with a reinforcing steel bar rust inhibitor twice, a corresponding number of reinforcing steel bars are processed through different mechanical equipment according to the requirements of construction drawings, and the finished reinforcing steel bars which are processed and formed are orderly stacked in batches and in stages to be marked;
s33, entrance binding: conveying the finished reinforcing steel bar into the geometric installation space, and binding in the geometric installation space in a binding manner;
s4, preparing the bare concrete: carrying out raw material model selection by combining environmental conditions of a construction site and construction drawings, calculating a corresponding mixing ratio to manufacture a visual sample plate, adopting the mixing ratio conforming to a standard visual sample plate, and providing the mixing ratio to a commercial concrete station for preparation;
s5, pouring clear water concrete: the prepared fair-faced concrete is conveyed to a construction site through a commercial concrete vehicle, and is unfolded to the geometric installation space by using concrete pouring equipment for pouring the fair-faced concrete;
s51, before pouring: paying attention to local weather and checking the site conditions of the steel bars and the templates, and checking the slump by a special person after the clear concrete is conveyed to a construction site;
s52, when pouring, pouring the fair-faced concrete, taking the corner as a starting point, pouring cement mortar with the thickness of 50-100 mm and the same as the component of the fair-faced concrete at the root, uniformly placing the cement mortar into a mold by using shovels, and controlling the thickness of the layered thickness by using a scale rod, wherein the pouring thickness of each layer of the fair-faced concrete is strictly controlled within 800 mm;
s6, vibrating the bare concrete: when concrete is poured, a vibrating rod is used for vibrating the concrete;
s7, leveling the upper opening: after the fair-faced concrete is poured, arranging reinforcing steel bars thrown out of the top of the geometric installation space, adding the fair-faced concrete by using a wooden trowel according to a standard height line, leveling the fair-faced concrete positioned at the top of the geometric installation space, and controlling the height difference within 10 mm;
s8, template stripping: after the bare concrete in the geometric installation space is cured, the external support frame and the template are removed;
s9, curing the bare concrete: and adhering a film on the cured wall surface for curing.
2. The construction method for the clear water concrete column for vestibules as claimed in claim 1, wherein the construction preparation in the step S23 is: construction paying-off → the templates are fixed with the supporting frames through the E-shaped beams, hidden inspection is carried out, sundries at the positions where the fair-faced concrete needs to be poured are cleaned → the positions between the opposite supporting frames are positioned by using PVC sleeves, embedded parts are installed → template accessories are installed, release agents are coated on the templates, a construction operation platform is erected → a template control line is rechecked, and mortar is used for leveling the ground or the floor surface.
3. The construction method for the fair-faced concrete column of the corridor as claimed in claim 2, wherein the installation sequence in the step S23 is as follows: according to the construction paying-off and template numbering, the prepared templates are hoisted into the place → the two adjacent templates are positioned at the PVC sleeve and are provided with matched arc-shaped grooves, the arc-shaped grooves of the templates are adjusted to be matched with the PVC sleeve, a special cushion block is arranged between the templates and the support frame, a fastening split bolt penetrates through the special cushion block to be connected with the PVC sleeve to preliminarily fix the templates → a double-sided adhesive tape is pasted between the adjacent templates, a long steel nail is used for fixing → the template is adjusted to be vertical, E-shaped steel is arranged between the templates and the support frame through a spliced seam, the E-shaped steel and the templates are fixed through a self-tapping screw, the template supporting condition is checked, and the local part is reinforced according to the node requirement.
4. The construction method for the clear water concrete column for the corridor according to claim 1, wherein the binding manner in the step S33 is as follows: the installation space around the geometry is equidistant installation vertical bars to form a reinforcement binding space, the vertical bars are perpendicular to the ground or the floor surface → the galvanized rust-proof binding wires are utilized to fix the vertical bars and the template → the horizontal bars are bound between two adjacent vertical bars → the vertical bars are equidistant installation in the reinforcement binding space, and the horizontal bars are bound between two adjacent vertical bars.
5. The construction method for the clear water concrete column for the corridor according to claim 1, wherein raw materials in the step S4 are water, cement, fly ash, mineral powder, sand, stone and additives.
6. The construction method for the fair-faced concrete column of the corridor as claimed in claim 5, wherein the raw materials are mixed according to the proportion of water 165: 280-300 parts of cement: 100-120% of fly ash: 0 part of mineral powder: sand 828: stone 1057: 5.2 of additive.
7. The construction method for the clear water concrete column for the corridor as claimed in claim 1, wherein the moving distance of the vibrating rods in the step S6 is less than or equal to 500 mm.
8. The construction method for the clear water concrete column of the corridor as claimed in claim 1, wherein the vibrating time of the vibrating rod in the step S6 is controlled between 20S and 30S.
9. The structure for the corridor fair-faced concrete column is applied to the construction method for the corridor fair-faced concrete column as claimed in any one of claims 1 to 8, and comprises support frames which are built by main keels and secondary keels, the main keels are perpendicular to the ground or floor surface, the secondary keels are sequentially and horizontally arranged along the main keels at equal intervals, the main keels and the secondary keels are fixedly connected through secondary beam bolt clamps, a plurality of the support frames can surround a geometric installation space, PVC sleeves are arranged between the opposite support frames, templates are sequentially installed in the installation space from bottom to top, the opposite surfaces of two adjacent templates are provided with arc-shaped grooves, the arc-shaped grooves are matched with the surfaces of the PVC sleeves, special cushion blocks are arranged between the support frames and the templates, one side of the support frames, far away from the templates, penetrates through the special cushion blocks through fastening counter-pulling bolts and is in threaded connection with the PVC sleeves, two adjacent the eclipsed face of template is pasted and is had two-sided adhesive tape to fasten it with long steel nail, the template with be provided with E shaped steel between the support frame, E shaped steel with through self tapping screw fixed connection between the template, center on fixedly connected with indulges the muscle in the installation space, just it is perpendicular with ground or floor face to indulge the muscle, adjacent two it has horizontal muscle through the rust-resistant ligature of bundling of zinc-plating between the muscle to indulge.
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| JP2880261B2 (en) * | 1990-06-27 | 1999-04-05 | 大成建設株式会社 | Construction method of concrete construction using granulated cement mixture |
| CN102444203B (en) * | 2011-09-15 | 2013-06-19 | 浙江城建建设集团有限公司 | High-altitude long-span overhanging corridor type reinforced concrete structure and construction method |
| CN103899088B (en) * | 2014-04-22 | 2016-02-03 | 中建八局第三建设有限公司 | Large span ultra-thin overlength cast-in-situ clear-water concrete Slate hanging construction method |
| CN111719856A (en) * | 2020-05-29 | 2020-09-29 | 中建一局集团第三建筑有限公司 | Bare concrete construction formwork system and construction method thereof |
| CN113250349A (en) * | 2021-05-17 | 2021-08-13 | 上海宝冶集团有限公司 | Method for pouring bare concrete special-shaped wall |
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