CN114108800A - Steel wire mesh framing cabin for cornice board concrete pouring and pouring construction method - Google Patents
Steel wire mesh framing cabin for cornice board concrete pouring and pouring construction method Download PDFInfo
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- CN114108800A CN114108800A CN202111494941.1A CN202111494941A CN114108800A CN 114108800 A CN114108800 A CN 114108800A CN 202111494941 A CN202111494941 A CN 202111494941A CN 114108800 A CN114108800 A CN 114108800A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 127
- 239000010959 steel Substances 0.000 title claims abstract description 127
- 239000004567 concrete Substances 0.000 title claims abstract description 112
- 238000010276 construction Methods 0.000 title claims abstract description 71
- 238000009432 framing Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 29
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 22
- 239000000463 material Substances 0.000 claims abstract description 16
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 20
- 230000008569 process Effects 0.000 claims description 14
- 238000009415 formwork Methods 0.000 claims description 9
- 239000004575 stone Substances 0.000 claims description 7
- 239000011083 cement mortar Substances 0.000 claims description 4
- 239000004744 fabric Substances 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
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- 239000002023 wood Substances 0.000 claims description 2
- 239000010410 layer Substances 0.000 description 31
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000007789 sealing Methods 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 238000009435 building construction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000003631 expected effect Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 210000003205 muscle Anatomy 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
- E04D13/00—Special arrangements or devices in connection with roof coverings; Protection against birds; Roof drainage ; Sky-lights
- E04D13/15—Trimming strips; Edge strips; Fascias; Expansion joints for roofs
- E04D13/158—Trimming strips; Edge strips; Fascias; Expansion joints for roofs covering the overhang at the eave side, e.g. soffits, or the verge of saddle roofs
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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
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
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- Electromagnetism (AREA)
- Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
Abstract
The invention discloses a steel wire mesh framing cabin for cornice plate concrete pouring, wherein an upper layer of steel bars and a lower layer of steel bars are arranged on an inclined plane of a cornice plate to form a steel wire mesh, a vertical steel wire mesh perpendicular to the inclined plane of the cornice plate is arranged at intervals of 600-1000 mm from the cornice bottom to the cornice top along the length direction of the cornice plate, and the vertical steel wire mesh is firmly bound with an upper layer of steel bars and a lower layer of steel bars on the inclined plane of the cornice plate respectively; simultaneously, begin to upwards extend 400 ~ 900mm wire net along cornice board inclined plane width direction from every perpendicular wire net upside, add in the wire net that extends and establish one deck close mesh wire net, the wire net that extends and close mesh wire net all with upper reinforcing bar ligature firm to form wire net framing cabin. The invention also discloses a cornice plate concrete pouring construction method. The method has the advantages of reducing the using amount of the template, effectively reducing the cost, ensuring the construction quality and safety, having simple working procedures, effectively improving the construction speed and simultaneously solving the problem of the downward sliding of the concrete pouring by using conventional materials.
Description
Technical Field
The invention relates to concrete pouring equipment and a pouring method, in particular to a steel wire mesh framing cabin for cornice board concrete pouring and a cornice board concrete pouring construction method, and belongs to the technical field of building construction.
Background
In the building construction process, people often meet the condition that the slope of the cornice plate is steeper, and the phenomenon of concrete sliding and segregation is often caused in the vibrating process, so that the concrete can only be naturally formed on the slope surface in an unconstrained sliding state. The concrete tamping performance is difficult to control, the construction quality is difficult to achieve the expected effect, and the potential problems of seepage and leakage are left for the construction of the concrete structure. How to control the slope concrete becomes a difficult problem to be around a construction party.
In the prior art, certain research is carried out on the construction of slope concrete. For example, the Chinese patent with publication number CN104674999A discloses a pitched roof spacing formwork and a concrete pouring method, wherein concrete in the method prevents downward sliding and passes through the spacing formwork, compared with the traditional single-side and double-side splint method, the method omits a complex formwork erecting mode, has the advantages of novel spacing formwork erecting mode, simple operation, and capability of pouring concrete step by matching with the spacing formwork, reducing construction alternation, effectively ensuring construction quality and effectively solving the hidden troubles of concrete downward sliding and leakage left by construction. For another example, chinese patent publication No. CN103615076A discloses a concrete construction method for a steep slope roof, which discloses a direct spray-anchoring construction method using an "L-shaped" tie bar process from bottom to top in stages and layers. This patent adopts "L type" drawknot muscle technology to replace traditional use template to solve the problem that the big domatic gliding of concrete construction, and it uses material simply, and construction occupation space is little, effectively solves narrow space construction.
Through technical characteristic comparison, the first patent in the patent publications adopts a mode of spacing formwork support, but does not consider the condition of narrow construction space; the second patent adopts a simple L-shaped tie bar process, solves the problem of narrow construction space, but the used materials are not green enough for construction, the application range of spray anchor construction is narrow (the concrete requirement is high, etc.), and the method is not suitable for waterproof layer construction under the condition that the inclined plate is thin.
At present, in the construction of constructional engineering, the inclined plate is constructed by considering not only that a waterproof layer is not damaged but also that the construction is simple, the applicability is strong and the construction is green. If the construction space of the cornice plate of the office building is narrow and the inclined plate is thin, the environment-friendly construction angle of economy and saving is combined, the condition that concrete is poured to slide downwards and seep and leak is ensured, and the general construction process cannot meet the requirement.
Disclosure of Invention
The invention aims to solve the defect that the operation surface is limited under the existing construction technical conditions, save cost according to local conditions, fully utilize conventional materials, simplify complex construction process, change a layered pouring method with longer construction period and poor construction integrity, provide a construction method which is simple to operate, improve working efficiency, ensure strong integrity of the cornice inclined plane, and have good anti-sliding and leakage effects, and can be applied to the situations of narrow construction space of the cornice of an office building and thin cornice inclined plane.
The invention is realized by the following steps:
a steel wire mesh framing cabin for concrete pouring of a cornice board is characterized in that an upper layer of steel bars and a lower layer of steel bars are arranged on the inclined plane of the cornice board to form a steel wire mesh, a vertical steel wire mesh perpendicular to the inclined plane of the cornice board is arranged at intervals of 600-1000 mm from the cornice bottom to the cornice top along the length direction of the cornice board, and the vertical steel wire mesh is firmly bound with an upper layer of steel bars and a lower layer of steel bars on the inclined plane of the cornice board respectively; and meanwhile, a 400-900 mm steel wire mesh is upwards extended from the upper side of each vertical steel wire mesh along the width direction of the inclined plane of the cornice board, a layer of dense-mesh steel wire mesh is additionally arranged inside the extended steel wire mesh, and the extended steel wire mesh and the dense-mesh steel wire mesh are firmly bound with an upper layer of steel bars, so that a steel wire mesh sub-frame cabin which is formed by the vertical steel wire mesh and the extended steel wire mesh and provided with a pouring seam is formed.
The further scheme is as follows:
the vertical steel wire mesh is firmly bound with the upper layer steel bar and the lower layer steel bar on the inclined plane of the cornice plate by adopting binding wires.
The further scheme is as follows:
the distance between the adjacent perpendicular wire netting is greater than the width of the wire net of extension to reserve the pouring seam of 100 ~ 200mm width between adjacent perpendicular wire netting.
The further scheme is as follows:
the dense mesh steel wire mesh is 10-18 mesh steel wire mesh.
The further scheme is as follows:
the extended steel wire mesh and the dense-mesh steel wire mesh are firmly bound with the upper layer of steel bars by binding wires.
The invention also provides a construction method for pouring the cornice board concrete, which utilizes the steel wire mesh framing cabin for pouring the cornice board concrete, and specifically comprises the following steps:
set up the wire net framing cabin more than 1 on cornice board inclined plane, start from both sides during the pouring, wire net framing cabin carries out the pouring construction one by one from bottom to top, and the pouring is on one side stretched into wire net framing under-deck with the vibrting spear during the pouring and is vibrated in, guarantees that wire net framing under-deck concrete is closely knit, and the surface course adopts the fine aggregate concrete to make level the surface course stone after the initial set, upwards pours the construction step by step.
The concrete pouring construction method for the cornice board comprises the following steps:
step one, preparation before construction
(1) After the roof frame column and the cantilever beam are cast with concrete, a construction joint is left in the cantilever beam section, and a large pattern including an axis, a beam line, a member beam plane projection line, a cornice board slope line and a stop line is laid according to the pattern of the inclined roof;
(2) support split heads (or welding support bars) are additionally arranged between an upper layer of reinforcing mesh and a lower layer of reinforcing mesh on the inclined plane of the cornice plate, the support split heads (or the support bars) are not less than phi 10, the spacing is not more than 1000mm multiplied by 1000mm, the number of supports in the same direction is not less than 2, and the distance between the supports and the tail end of the plate bar is not more than 150 mm;
(3) the steel bars are firmly bound with each other;
(4) when binding the reinforcing steel bars, the cornice plate is made into a cushion block by cement mortar, and the cushion block cushions the reinforcing steel bars;
step two, steel wire mesh framing cabin construction
An upper layer of reinforcing mesh and a lower layer of reinforcing mesh are arranged on the inclined plane of the cornice plate, a vertical steel mesh perpendicular to the inclined plane of the cornice plate is arranged every 600-1000 mm from the cornice bottom to the cornice top along the through length direction of the cornice plate, and the vertical steel mesh is firmly bound with the upper layer of reinforcing steel bar and the lower layer of reinforcing steel bar on the inclined plane of the cornice plate by adopting binding wires; the method comprises the following steps that a 400-900 mm steel wire mesh is upwards extended from the upper side of each vertical steel wire mesh along the width direction of an inclined plane of a cornice board, a pouring seam with the width of 100-200 mm is reserved, a layer of 10-18-mesh dense steel wire mesh is additionally arranged inside the extended steel wire mesh, the extended steel wire mesh and the dense steel wire mesh are firmly bound with upper-layer steel bars through binding wires, the binding density is less than or equal to 150mm multiplied by 150mm, dense cloth binding is carried out, and construction of a steel wire mesh sub-width cabin is completed;
step three, concrete pouring
Before concrete pouring, carrying out wet water on a wood template laid on the inner bottom side of the cornice plate; during pouring, the steel wire mesh framing cabin is poured one by one from the two sides and from bottom to top, after a manually matched hopper is adopted to distribute materials along a reserved 100-200 pouring seam, a portable light inserted vibrating bar is adopted to stretch into the steel wire mesh framing cabin for vibrating, and concrete in the steel wire mesh framing cabin is supplemented in time insufficiently in the vibrating process, so that hollowing in the cabin is avoided; the pouring seams of 100-200 parts are reserved, and timely material supplement is needed due to the fact that concrete slides and sinks, so that rib leakage is avoided;
step four, repairing the inclined plane
When the concrete reaches initial setting and no squeezing foot print appears on the person, adopting equal-level compensation shrinkage fine stone concrete to repair and level the board surface of the inclined plane of the cornice board;
step five, concrete curing
After concrete pouring is finished, arranging personnel specially for watering and maintaining within 12 hours; watering times ensure that the concrete has a sufficient wet state, and maintaining time is not less than 7 days so as to ensure the strength of the concrete;
step six, reserved hole processing
And (5) supporting a formwork at the bottom of the cornice at the later stage of the reserved hole, and filling and compacting by adopting same-grade micro-expansion concrete.
The invention has at least the following beneficial effects:
1) the material is conventional, so that civilized green construction is fully embodied, no pollution is caused, and the cost is low;
2) the method has the advantages that the usage amount of the template is reduced, the cross construction of template installation and concrete pouring is effectively avoided, the cost is effectively reduced, the construction quality and safety are ensured, the process is simple, and the construction speed is effectively improved;
3) the problem of concrete pouring gliding is effectively solved, the concrete compactness, the surface flatness and the appearance quality which are difficult to control are controlled, the construction quality reaches the expected effect, and the common problems of leakage and hidden trouble caused by concrete structure construction are thoroughly solved.
Drawings
FIG. 1 is a schematic diagram of cornice slab concrete pouring construction;
FIG. 2 is a schematic view of the cross-sectional structure A-A of FIG. 1;
fig. 3 is a schematic structural view of a section B-B of fig. 1.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
Example 1
As shown in fig. 1-3, in this embodiment, a steel wire mesh framing cabin for cornice slab concrete pouring is provided, in which an upper layer and a lower layer of steel bars are arranged on an inclined plane of a cornice slab 3 to form a steel wire mesh, a vertical steel wire mesh 1 perpendicular to the inclined plane of the cornice slab is arranged every 600-1000 mm along the length direction of the cornice slab from the cornice bottom to the cornice top, and the vertical steel wire mesh is firmly bound with an upper layer of steel bars 7-1 and a lower layer of steel bars 7-2 on the inclined plane of the cornice slab 3 by using binding wires 11; meanwhile, a 400-900 mm steel wire mesh is upwards extended from the upper side of each vertical steel wire mesh along the width direction of the inclined plane of the cornice board, the distance between every two adjacent vertical steel wire meshes 1 is larger than the width of the extended steel wire mesh, a pouring seam 10 with the width of 100-200 mm is reserved between every two adjacent vertical steel wire meshes, a layer of 10-18-mesh dense steel wire mesh 2 is additionally arranged inside the extended steel wire mesh, and the extended steel wire mesh and the dense steel wire mesh are firmly bound with an upper layer of steel bars 7-1 through binding wires 11, so that a steel wire mesh sub-frame cabin which is formed by the vertical steel wire mesh 1 and the extended steel wire mesh and is provided with the pouring seam 10 is formed.
Example 2
A cornice plate concrete pouring construction method is characterized in that a vertical steel wire mesh 1 is arranged every 600-1000 mm from the cornice bottom to the cornice top along the length direction of a cornice plate 3, and the vertical steel wire mesh 1 is firmly bound with upper and lower layers of reinforcing steel bars on the inclined plane of the cornice plate by adopting binding wires; extend 400 ~ 900mm wire net (reserve 100 ~ 200 pouring seam) along cornice board inclined plane width direction, its extension portion wire net is inside to add and to establish the dense mesh wire net of one deck 10 ~ 18 meshes, the wire net is firm with the ligature of upper reinforcing bar with the ligature silk, start from both sides during the pouring, from bottom to top, it vibrates to stretch into wire net framing under-deck with the vibrting spear on one side to pour into, it is closely knit to guarantee wire net framing under-deck concrete, the surface course adopts the fine aggregate concrete to make level the surface course stone paving after the initial set, upwards pour into the construction step by step.
The more detailed technical scheme of the invention is as follows:
a construction method for preventing the concrete pouring of a cornice board from sliding down comprises the following steps:
step one, preparation before construction
(1) After the concrete pouring of the roof frame column 4 and the cantilever beam 5 is finished, a construction joint is reserved in the cantilever beam section, and a large sample drawing including an axis, a beam line, a component beam (a sealing beam 6) plane projection line, a cornice plate 3 slope line, a termination line and the like is put according to the style of an inclined roof.
(2) In order to avoid sinking of the plate bars in the concrete pouring process and guarantee the effective height of the plate bars, effective supporting bars 8 are additionally arranged between the double-layer reinforcing mesh, the supporting bars can be supporting split heads, the supporting bars 8 are not smaller than phi 10, the spacing is not larger than 1000mm multiplied by 1000mm, the number of the supporting bars in the same direction is not less than 2, and the distance between the supporting bars and the tail end of the plate bar is not larger than 150 mm.
Wherein, the brace rod on the same direction is on same reinforcing bar in the two-way reinforcing bar, and every reinforcing bar guarantees to be provided with twice, plays the drawknot effect, avoids oblique roofing cornice double-deck reinforcing bar to cause gradient error and deformation damage because of the structure concrete placement separation. And the tail ends of the plate bars refer to two ends of the reinforcing mesh, namely the ends of the reinforcing mesh and the cantilever beam which are lapped.
(3) The reinforcing steel bars should be bound firmly to prevent the binding buckles from loosening due to collision and vibration when the concrete is poured and pounded, and the reinforcing steel bars are displaced to cause exposed reinforcing steel bars.
(4) When binding the reinforcing steel bars, a protective layer is reserved according to the design rule. Adopt cement mortar to make cushion 9, cushion 9 should be with the reinforcing bar pad, forbid the reinforcing bar pad reinforcing bar or with the reinforcing bar with iron nail, iron wire snap-on the wooden template of interior bottom side laying of cornice board.
Step two, concrete anti-gliding measure construction
The vertical steel wire mesh is firmly bound with the upper layer steel bar and the lower layer steel bar of the inclined plane of the cornice plate by adopting binding wires; extend 400 ~ 900mm wire net (reserving 100 ~ 200 pouring seams) along cornice board inclined plane width direction, its extension portion wire net is inside to add and to establish the dense mesh wire net of one deck 10 ~ 18 meshes, and the wire net is firmly bound with the upper reinforcing bar with binding wire, and the binding density should not be greater than 150mm and carry out the dense cloth ligature.
Step three, concrete pouring
Before concrete pouring, the template is subjected to wet water. During pouring, after a manually-matched hopper is adopted to distribute materials along a reserved 100-200 pouring seam from two sides to top, a portable light-weight inserted vibrating bar is adopted to stretch into the steel wire mesh amplitude division cabin for vibrating, and concrete in the steel wire mesh amplitude division cabin is supplemented insufficiently in time during vibrating, so that the cabin is prevented from hollowing; the pouring seams of 100-200 parts are reserved, and timely material supplement is needed due to the fact that concrete slides and sinks, and rib leakage is avoided.
Step four, repairing the inclined plane of the cornice plate
And when the concrete reaches initial setting and no squeezing foot printing appears, repairing and leveling the plate surface by adopting the equivalent-grade compensation shrinkage fine stone concrete.
Step five, concrete curing
After concrete pouring is finished, personnel are specially arranged within 12 hours for watering and curing. The watering frequency is required to ensure that the concrete has enough wet state, and the curing time is not less than 7 days to ensure the strength of the concrete.
And step six, reserving the hole for processing.
If support the pole setting and pass through when cornice board be equipped with phi 75 reservation hole on the cornice board, for guaranteeing support system overall stability, the pole setting is demolishd after cornice board concrete pouring finishes, so reserve the hole later stage and at cornice board bottom formwork, adopt the little expansive concrete of same grade to pour and fill closely knit.
In the invention, the adoption of various technical schemes has specific functions and effects, and the specific description is as follows:
(1) steel wire mesh: in order to not influence the concrete coagulation at the two sides of the steel wire mesh interface, the vertical steel wire mesh and the extended steel wire mesh are not selected to be too small in size, and the steel wire mesh should control the concrete grade sand and stone to pass through the mesh rate of 1/3-3/5, preferably 1/2. The dense mesh steel wire mesh is 10-18 meshes and is additionally arranged inside the extending part of the steel wire mesh. Because the slope of cornice board generally sets up steeper, pour the concrete from the surface course, dense mesh wire net prevents that the concrete from gliding the loss, only can the seepage flow partial grout, plays the effect of template interception. And the situation that the vertical steel wire mesh is arranged to slide, deposit and separate in the concrete pouring and vibrating process is well solved.
The extended steel wire mesh and the upper layer of steel bars are firmly bound by binding wires, so that slurry leakage and slurry leakage are well avoided, and the concrete can be naturally formed only in the steel wire mesh framing cabin on the slope surface in an unconstrained and sliding state; the steel wire mesh that extends has still played the effect of drawknot muscle, ensures effectively simultaneously that equal grade compensation shrink pea gravel concrete receives surface course and entity connection ability, avoids the hollowing to appear.
(2) Slump: because the slope is great, the concrete takes shape more difficultly, will inform the mixing plant in time to adjust the concrete mix proportion when cornice board pours, concrete slump control is 120 ± 20 mm. The slump of the fine aggregate concrete with the same level of compensation shrinkage is controlled to be 100 +/-20 mm.
(3) Pouring and vibrating: a tower crane is adopted to vertically transport a hopper to a feeding platform, and special vibrating rods with phi 30 and phi 50 are arranged to vibrate, during vibrating, the special vibrating rods are inserted from bottom to top and are pulled slowly, inserting points are required to be uniformly arranged and move point by point, vibration leakage is avoided, and uniform compaction is achieved. The movement distance is not more than 1.25 times of the vibration radius, and is preferably 300-400 mm. The dense part of the reinforcing steel bars adopts a 30-type vibrator. The method comprises the steps of manually collecting materials and supplementing materials by using a shovel in time, continuously pouring, finally leveling by using a wooden trowel in a matching manner, leveling the laitance by using a bar ruler, pushing the laitance upwards in a parallel manner, and controlling the thickness of the inclined plane stay wire by using a thickness control ruler. The construction needs to have strong planning, large surface and small surface are firstly carried out, one-time continuous pouring is strictly carried out according to the flow designed in advance, the pouring speed is properly slowed down, the materials are distributed and vibrated by a vibrating spear, and the materials are supplemented in time; and (4) the cornice plates are poured without leaving construction joints as much as possible, if the construction joints are really needed to be left, the laitance is cleaned up before pouring again, and the water-swelling water-stopping adhesive tape is placed.
(4) Pouring sequence: symmetrically pouring concrete from two sides to the middle of the cornice plate from bottom to top, wherein the interval time is less than the initial setting time of the concrete (about 3 hours); and finally, pouring a sealing edge beam.
(5) In the concrete pouring process, full-time personnel are arranged to frequently observe the conditions of the template, the support, the reinforcing steel bars and the like, and corresponding measures are taken to process when deformation and movement are found. The elevation of the concrete surface is controlled by strictly checking the thickness of the slab according to the elevation in multiple directions and multiple points or by adopting a steel chisel insertion method, so that the concrete pouring quality is ensured.
(6) The elevation of the concrete surface is controlled by a 4-meter scraper by means of a pulled control line. Vibrating back and forth by a vibrator in the vertical pouring direction, and after vibrating, leveling the surface by a scraping ruler.
(7) Concrete surface shrinkage: the surface is required to be dense, smooth and press polished; the concrete must not have the defects of peeling, sanding, cracking and the like. If a concrete surface is poured and a honeycomb pitted surface is formed in the local part after the form removal, the concrete is repaired by adopting modes of fine aggregate concrete, high-grade cement mortar (1:2) or local pouring of pure cement slurry, and the like, and the safety of the concrete structure is ensured by careful repair.
In the construction method, the inclined plane pouring of the cornice plate adopts the operation mode of symmetrically pouring concrete from two sides to the middle from bottom to top by reasonably controlling the interval time and finally sealing the boundary beam. The method has the advantages of adjusting to local conditions, saving cost, fully utilizing conventional materials, simplifying complex construction process and changing the traditional layered pouring method with longer construction period and poor construction integrity.
Although the present invention has been described herein with reference to the illustrated embodiments thereof, which are intended to be preferred embodiments of the present invention, it is to be understood that the invention is not limited thereto, and that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure.
Claims (7)
1. The utility model provides a cornice board concrete placement is with wire net framing cabin which characterized in that: an upper layer of reinforcing steel bars and a lower layer of reinforcing steel bars are arranged on the inclined plane of the cornice plate to form a reinforcing steel bar net, a vertical steel wire net perpendicular to the inclined plane of the cornice plate is arranged every 600-1000 mm from the cornice bottom to the cornice top, and the vertical steel wire net is firmly bound with the upper layer of reinforcing steel bars and the lower layer of reinforcing steel bars on the inclined plane of the cornice plate respectively; and meanwhile, a 400-900 mm steel wire mesh is upwards extended from the upper side of each vertical steel wire mesh along the width direction of the inclined plane of the cornice board, a layer of dense-mesh steel wire mesh is additionally arranged inside the extended steel wire mesh, and the extended steel wire mesh and the dense-mesh steel wire mesh are firmly bound with an upper layer of steel bars, so that a steel wire mesh sub-frame cabin which is formed by the vertical steel wire mesh and the extended steel wire mesh and provided with a pouring seam is formed.
2. The cornice board is wire net framing cabin for concrete placement according to claim 1, characterized in that:
the vertical steel wire mesh is firmly bound with the upper and lower layers of steel bars on the inclined plane of the cornice plate by adopting binding wires.
3. The cornice board is wire net framing cabin for concrete placement according to claim 1, characterized in that:
the distance between the adjacent perpendicular wire netting is greater than the width of the wire net of extension to reserve the pouring seam of 100 ~ 200mm width between adjacent perpendicular wire netting.
4. The cornice board is wire net framing cabin for concrete placement according to claim 1, characterized in that:
the dense mesh steel wire mesh is 10-18 mesh steel wire mesh.
5. The cornice board is wire net framing cabin for concrete placement according to claim 1, characterized in that:
the extended steel wire mesh and the dense-mesh steel wire mesh are firmly bound with the upper layer of steel bars by binding wires.
6. The cornice board concrete pouring construction method is characterized by comprising the following steps of:
set up the wire net framing cabin more than 1 on cornice board inclined plane, start from both sides during the pouring, wire net framing cabin carries out the pouring construction one by one from bottom to top, and the pouring is on one side stretched into wire net framing under-deck with the vibrting spear during the pouring and is vibrated in, guarantees that wire net framing under-deck concrete is closely knit, and the surface course adopts the fine aggregate concrete to make level the surface course stone after the initial set, upwards pours the construction step by step.
7. The cornice slab concrete pouring construction method according to claim 6, characterized in that:
step one, preparation before construction
(1) After the roof frame column and the cantilever beam are cast with concrete, a construction joint is left in the cantilever beam section, and a large pattern including an axis, a beam line, a member beam plane projection line, a cornice board slope line and a stop line is laid according to the pattern of the inclined roof;
(2) support split heads (or welding support bars) are additionally arranged between an upper layer of reinforcing mesh and a lower layer of reinforcing mesh on the inclined plane of the cornice plate, the support split heads (or the support bars) are not less than phi 10, the spacing is not more than 1000mm multiplied by 1000mm, the number of supports in the same direction is not less than 2, and the distance between the supports and the tail end of the plate bar is not more than 150 mm;
(3) the steel bars are firmly bound with each other;
(4) when binding the reinforcing steel bars, the cornice plate is made into a cushion block by cement mortar, and the cushion block cushions the reinforcing steel bars;
step two, steel wire mesh framing cabin construction
An upper layer of reinforcing mesh and a lower layer of reinforcing mesh are arranged on the inclined plane of the cornice plate, a vertical steel mesh perpendicular to the inclined plane of the cornice plate is arranged every 600-1000 mm from the cornice bottom to the cornice top along the through length direction of the cornice plate, and the vertical steel mesh is firmly bound with the upper layer of reinforcing steel bar and the lower layer of reinforcing steel bar on the inclined plane of the cornice plate by adopting binding wires; the method comprises the following steps that a 400-900 mm steel wire mesh is upwards extended from the upper side of each vertical steel wire mesh along the width direction of an inclined plane of a cornice board, a pouring seam with the width of 100-200 mm is reserved, a layer of 10-18-mesh dense steel wire mesh is additionally arranged inside the extended steel wire mesh, the extended steel wire mesh and the dense steel wire mesh are firmly bound with upper-layer steel bars through binding wires, the binding density is less than or equal to 150mm multiplied by 150mm, dense cloth binding is carried out, and construction of a steel wire mesh sub-width cabin is completed;
step three, concrete pouring
Before concrete pouring, carrying out wet water on a wood template laid on the inner bottom side of the cornice plate; during pouring, the steel wire mesh framing cabin is poured one by one from the two sides and from bottom to top, after a manually matched hopper is adopted to distribute materials along a reserved 100-200 pouring seam, a portable light inserted vibrating bar is adopted to stretch into the steel wire mesh framing cabin for vibrating, and concrete in the steel wire mesh framing cabin is supplemented in time insufficiently in the vibrating process, so that hollowing in the cabin is avoided; the pouring seams of 100-200 parts are reserved, and timely material supplement is needed due to the fact that concrete slides and sinks, so that rib leakage is avoided;
step four, repairing the inclined plane
When the concrete reaches initial setting and no squeezing foot print appears on the person, adopting equal-level compensation shrinkage fine stone concrete to repair and level the board surface of the inclined plane of the cornice board;
step five, concrete curing
After concrete pouring is finished, arranging personnel specially for watering and maintaining within 12 hours; watering times ensure that the concrete has a sufficient wet state, and maintaining time is not less than 7 days so as to ensure the strength of the concrete;
step six, reserved hole processing
And (5) supporting a formwork at the bottom of the cornice at the later stage of the reserved hole, and filling and compacting by adopting same-grade micro-expansion concrete.
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Application publication date: 20220301 |