CN110295752B - Construction method for cast-in-situ reinforced concrete cantilever beam lower constructional column - Google Patents
Construction method for cast-in-situ reinforced concrete cantilever beam lower constructional column Download PDFInfo
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- CN110295752B CN110295752B CN201910693893.5A CN201910693893A CN110295752B CN 110295752 B CN110295752 B CN 110295752B CN 201910693893 A CN201910693893 A CN 201910693893A CN 110295752 B CN110295752 B CN 110295752B
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- 238000010276 construction Methods 0.000 title claims abstract description 39
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 14
- 239000011150 reinforced concrete Substances 0.000 title claims abstract description 13
- 239000004567 concrete Substances 0.000 claims abstract description 59
- 239000006260 foam Substances 0.000 claims abstract description 42
- 239000002002 slurry Substances 0.000 claims abstract description 15
- 238000002955 isolation Methods 0.000 claims abstract description 13
- 229910000831 Steel Inorganic materials 0.000 claims description 30
- 239000010959 steel Substances 0.000 claims description 30
- -1 polytetrafluoroethylene Polymers 0.000 claims description 29
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 29
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 29
- 239000000463 material Substances 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 5
- 230000000903 blocking effect Effects 0.000 claims description 4
- 239000004570 mortar (masonry) Substances 0.000 claims description 4
- 230000003014 reinforcing effect Effects 0.000 claims description 4
- 238000004513 sizing Methods 0.000 claims description 4
- 238000005187 foaming Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000009749 continuous casting Methods 0.000 claims description 2
- 239000011440 grout Substances 0.000 claims description 2
- 238000003780 insertion Methods 0.000 claims description 2
- 230000037431 insertion Effects 0.000 claims description 2
- 238000003825 pressing Methods 0.000 claims description 2
- 230000007306 turnover Effects 0.000 claims 1
- 238000007789 sealing Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 10
- 230000002787 reinforcement Effects 0.000 description 5
- 230000001360 synchronised effect Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
The invention relates to a construction method of a cast-in-situ reinforced concrete cantilever beam lower constructional column, and belongs to the field of buildings. Firstly, a three-sided annular plate strip is additionally arranged on the inner side of the top of the constructional column template to fully isolate the concrete at the periphery of the constructional column from the concrete of the cantilever beam; secondly, a drawer opening is reserved at the top of the constructional column template at the position where the constructional column template and the cantilever beam template are positioned at the same vertical face, and a high-lubricity drawer fixing bin with a concrete pouring hole and a foam plate in the drawer fixing bin is inserted, so that the up-and-down smooth pouring and the effective sealing of the periphery of constructional column concrete are realized; thirdly, a slurry overflow hole is formed in the position 20-25mm away from the bottom of the drawer opening at the top of the constructional column template, when concrete flows out from the slurry overflow hole, the drawer movable bin paved with the foam plates in the drawer movable bin is pushed in time to be closed, and embedding is completed by detaching the foam plates in the drawer movable bin, so that effective isolation of the subsequent concreting and concreting of the constructional column is completed.
Description
Technical Field
The invention relates to the field of buildings, in particular to a construction process of a cast-in-situ constructional column under a cantilever beam in a reinforced concrete structural system in the building industry.
Background
It is known that in a cast-in-situ reinforced concrete structure system, a constructional column is arranged below the cantilever beam, and the constructional column is mainly used for constructional reinforcement and constraint deformation of a lower enclosure wall of the cantilever beam, the cantilever beam is usually a main stress member at the position of a building overhanging balcony, an outer gallery and the like, no vertical stress conduction structural member is arranged below the cantilever beam, and the cantilever beam is completely stressed by overhanging, so that the main stress steel bar of the cantilever beam is the upper steel bar of the cantilever beam. If the constructional column under the cantilever beam is synchronously constructed along with the stress components such as the cantilever beam and the like, due to incorrect operation of a construction method, the constructional column and the cantilever Liang Yitong are formed in a cast-in-situ mode, so that the constructional column becomes a vertical stress fulcrum of the cantilever beam, firstly, the constructional column is difficult to bear vertical load transmitted by the cantilever beam because of smaller section and reinforcement, secondly, the reinforcement stress of the cantilever beam is changed, the original upper reinforcement stress is changed into the lower reinforcement stress, and the design principle is completely violated, so that great structural potential safety hazards exist. If the constructional column concrete is poured independently, then structural member concrete such as cantilever beams is poured after isolation measures are taken, the construction efficiency is very low, and the cost is very high. Therefore, the traditional method is secondary structure construction, after the construction of structural members such as the cantilever beam is completed, the construction of the lower constructional column of the cantilever beam is performed, but the construction cost of the procedure is high, the quality and the safety are not easy to ensure, and the construction method is very annoying to construction technicians. The method is not scientific, and proved by practice, firstly, because the constructional column concrete is difficult to move downwards to realize the isolation from the cantilever beam under the constraint of the holding force of the reinforcing steel bars, unless the constructional column is completely destroyed and fails, secondly, the operation leads to the basic absence of concrete at the bottom of the constructional column, and the rigidity of the bottom of the constructional column is not at all, so that the due effect of the constructional column is not achieved at all, and leakage is easy to cause. How to find an effective method which is convenient to operate, reduces the cost, ensures the quality and the safety, truly exerts the working principles of the constructional column and the cantilever beam, and is a research target for continuous follow-up and improvement of the technical staff in the construction field.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the construction method for the cast-in-situ reinforced concrete cantilever beam lower constructional column, which can not only effectively realize the isolation between the cantilever beam and the cantilever beam lower constructional column, but also realize the synchronous construction of the cantilever beam and the cantilever beam lower constructional column, so as to reduce the construction cost and ensure the construction quality and safety.
The technical scheme adopted for solving the technical problems is as follows: a construction method of a cast-in-situ reinforced concrete cantilever beam lower constructional column is characterized in that,
A. Preparing a constructional column template, forming a drawer opening of a drawer fixing bin on the constructional column template according to the principle that the vertical surfaces of the constructional column template and the cantilever beam template are on the same plane, forming a slurry overflow hole at the lower part of the drawer opening, and additionally arranging three annular battens on the inner sides of the tops of the other three surfaces of the constructional column template;
b. Customizing a drawer fixed bin and a drawer movable bin which can be matched in a drawing way, wherein concrete pouring holes are formed in an upper plate and a lower plate of the drawer fixed bin;
c. Installing a vertical steel bar of a constructional column below the cantilever beam and a constructional column stirrup, and properly adjusting the elevation of the top of the constructional column stirrup, so that the upper part of the constructional column stirrup simultaneously plays a role of a positioning bracket of a drawer fixing bin;
d. Installing a constructional column template and an overhanging beam template under the overhanging beam, reinforcing the constructional column template by adopting a vertical square timber of the constructional column template, a transverse steel timber of the constructional column template, a split bolt sizing block of the constructional column template and a split bolt of the constructional column template, and reinforcing the overhanging beam template by adopting a transverse square timber of the overhanging beam template and a vertical steel timber of the overhanging beam template;
e. The drawer fixing bin is inserted into the position of the opening of the drawer at the top of the constructional column template, the horizontal positioning of the drawer fixing bin is ensured by utilizing the bracket action of the constructional column stirrups and the constructional column template, the drawer fixing bin is abutted against the constructional column vertical steel bars, and the constraint of the three annular battens at the periphery of the constructional column vertical steel bars is utilized to fully squeeze the drawer fixing bin and the constructional column vertical steel bars; before the drawer fixed bin is inserted, firstly, inserting a foam plate in the drawer fixed bin into the inner end part of the drawer fixed bin, paving a foam plate in the drawer movable bin, then inserting a drawer movable bin into the drawer fixed bin, tightly squeezing the drawer movable bin and the foam plate in the drawer movable bin with the foam plate in the drawer fixed bin, and then pulling out the drawer movable bin and the foam plate in the drawer movable bin to ensure that the foam plate in the drawer fixed bin is tightly contacted with the vertical steel bars of the constructional column;
f. The inner edge of the pulled drawer movable bin is required to be flush with the outer edge of the concrete pouring hole penetrating through the upper plate and the lower plate of the drawer fixed bin, so that the complete leakage of the concrete pouring hole and the complete plugging of the periphery of the hole are ensured, and the pouring of constructional column concrete is facilitated;
g. After the work is finished, pouring cantilever beam concrete and cantilever beam lower constructional column concrete, when slurry overflow holes on the constructional column template are found to overflow outwards, timely pushing the drawer movable bin inwards to ensure that a foam plate in the drawer movable bin paved by the drawer movable bin is tightly contacted with a foam plate plugged at the inner end part of the drawer fixed bin again, so that the drawer movable bin is completely closed, and then pushing the drawer movable bin to pull out the drawer fixed bin in the constructional column template;
h. blocking the grout overflow hole, pressing the foam plate in the drawer movable bin, and pulling out the drawer movable bin to leave the foam plate in the drawer movable bin at the position of the concrete pouring hole, thereby completing the isolation of the pouring concrete at the position;
i. and (3) reinserting a drawer fixing bin at the drawer opening of the next similar constructional column template, and circulating the drawer fixing bin in turn for use.
The distance between the slurry overflow hole part and the bottom of the drawer fixing bin is 20-25mm so as to match the continuous casting thickness of concrete corresponding to the possible delay time of the drawer fixing bin insertion.
The drawer fixed bin and the movable bin are made of polytetrafluoroethylene, and the wall thickness is 2mm.
The inner end part of the drawer movable bin is flush with the nearest edge of the concrete pouring hole of the drawer fixed bin in the pulled state, so that the smooth falling of concrete at the concrete pouring hole of the drawer fixed bin is ensured, and the effect of completely plugging the periphery of the hole is achieved.
The length of the drawer fixed bin is 140mm larger than that of the drawer movable bin, so that the installation requirement of the drawer fixed bin is met, and the bracket of the drawer movable bin is also realized.
After the constructional column template is removed, the outer periphery of the top of the constructional column is blocked by adopting flexible materials or foaming materials or low-strength mortar in time, so that the vertical steel bars of the constructional column are prevented from rusting.
The drawer fixing bin is cuboid, and the outer opening of the drawer fixing bin is provided with a U-shaped flanging along the height direction.
The drawer handle is arranged on the outer side of the drawer movable bin, and the length and the height of the handle meet the requirement of inserting the drawer fixed bin.
The invention has the beneficial effects that by synchronously constructing the cantilever beam and other components, the construction process of the cantilever beam lower constructional column and the concrete effective isolation method during synchronous construction of the cantilever beam and the cantilever beam, the construction progress is quickened, the construction quality and safety are ensured, the construction cost is reduced, the design intention is realized, the problems of difficult secondary construction and installation, high cost, unsafe, rotten root of the constructional column, large top gap of the constructional column, poor impression quality, easy leakage and the like are really solved, and the pain point of a construction technician to the part is thoroughly solved.
Drawings
The invention will be further described with reference to the drawings and examples.
Fig. 1 is a schematic view of the construction of a lower constructional column of a cantilever beam according to the invention.
FIG. 2-1 is a schematic illustration of the drawer movable compartment of the present invention in an open configuration at the top of the column.
Fig. 2-2 is a schematic view of the drawer movable compartment of the present invention in a closed configuration at the top of the constructional column.
FIG. 3 is a schematic view of the structure of the column top form of the present invention.
Fig. 4-1 is a schematic view of the structure of the drawer fixing compartment of the present invention.
Fig. 4-2 is a schematic structural view of the inner end sealing foam plate of the drawer fixing bin of the invention.
Fig. 5-1 is a schematic view of the structure of the drawer movable compartment of the present invention.
Fig. 5-2 is a schematic structural view of the inner foam board laid in the movable warehouse of the drawer.
FIG. 6 is a schematic view of the structure of the drawer movable compartment of the drawer fixed compartment of the present invention.
FIG. 7 is a schematic view of the concrete isolation between the top of the constructional column and the cantilever beam according to the invention.
In the figure, 1 is a constructional column template, 2 is a three-sided annular batten, 3 is a constructional column vertical steel bar, 4 is a drawer opening, 5 is a drawer fixing bin external pulling handle, 6 is a drawer fixing bin internal foam board, 7 is a drawer fixing bin, 8 is a drawer movable bin internal foam board, 9 is a drawer handle, 10 is a drawer movable bin, 11 is a concrete pouring hole, the concrete column comprises the following components of a concrete column frame, a constructional column stirrup, a cantilever beam template, a transverse square timber, a cantilever beam template, a vertical steel timber, a slurry overflow hole, a constructional column template split bolt sizing block, a constructional column template transverse steel timber, a constructional column template vertical square timber and a constructional column.
Detailed Description
Referring to fig. 1 and 3, a constructional column template 1 is prepared firstly, a reserved drawer opening 4 of a polytetrafluoroethylene drawer fixing bin 7 is formed on the surface according to the principle that the constructional column template 1 and the vertical surface of an overhanging beam template 14 are positioned on the same plane, the size of the drawer opening 4 is 160 mm in width and 25mm in height, a slurry overflow hole 17 with the diameter of 5mm is formed in the constructional column template 1 at the position of 20-25mm below the drawer opening 4, the slurry overflow hole 17 simultaneously plays a role of an air outlet, and then a three-surface annular plate strip 2 with the width of 25mm in height is additionally arranged on the inner sides of the tops of the other three surfaces of the constructional column template 1.
Referring to fig. 4-1, 4-2, 5-1, 5-2, 6, the polytetrafluoroethylene drawer fixed compartment 7 and drawer movable compartment 10 are customized such that the following requirements are met: the thickness of the polytetrafluoroethylene plate is 2mm, the size of the outer edge of the polytetrafluoroethylene drawer fixing bin 7 is 320 x 158 x 24mm in length and width, the size of the drawer fixing bin outer handle 5 with the outer opening being provided with a U-shaped flanging along the height direction is 25 x 20mm in width and height, and therefore the drawer fixing bin 7 can be pulled out manually. The concrete pouring hole 11 is formed in the upper portion and the lower portion of the drawer fixing bin 7 at the position, which is located at the position, away from the center of the 135mm position of the outer opening of the flanged drawer fixing bin outer handle 5, and the hole size is 150mm, and is used as the pouring hole of the constructional column 22. The polytetrafluoroethylene drawer movable cabin 10 is 180 x 148 x 10-18mm long and wide (the height of one side provided with the drawer handle 9 is 10mm, and the heights of the other two sides are 18 mm), and the drawer handle 9 is arranged. The length of the drawer fixed bin 7 is 140mm longer than that of the drawer movable bin 10, and the drawer fixed bin fully plays a role of a bracket of the drawer movable bin, so that the part of the drawer movable bin, which is pulled out, cannot fall off.
Referring to fig. 1, the cantilever beam lower constructional column vertical steel bar 3 and the constructional column stirrup 12 are installed, and the elevation of the top of the constructional column stirrup 12 is properly adjusted, so that a certain constructional column stirrup 12 on the upper part of the constructional column stirrup 12 simultaneously plays a role of a positioning bracket of the polytetrafluoroethylene drawer fixing bin 7, and is verified to be qualified.
Referring to fig. 1, a constructional column template 1 and an overhanging beam template 14 under an overhanging beam 13 are installed, the constructional column template 1 is reinforced by adopting a constructional column template vertical square timber 21, a constructional column template transverse steel timber 20, a constructional column template split bolt sizing block 19 and a constructional column template split bolt 18, the overhanging beam template 14 is reinforced by adopting an overhanging beam template transverse square timber 15 and an overhanging beam template vertical steel timber 16, and the verification is qualified.
Referring to fig. 1, 2-1 and 2-2, after the cantilever beam template 14 and the constructional column template 1 are accepted, a polytetrafluoroethylene drawer fixing bin 7 is inserted into a drawer opening 4 reserved in one side template at the top of the constructional column template 1, the horizontal positioning of the polytetrafluoroethylene drawer fixing bin 7 is ensured by utilizing the bracket action of constructional column stirrups 12 and the constructional column template 1, the polytetrafluoroethylene drawer fixing bin 7 is abutted against the constructional column vertical steel bar 3, and the constraint of three annular strips 2 at the periphery of the constructional column vertical steel bar 3 is utilized to enable the polytetrafluoroethylene drawer fixing bin 7 and the constructional column vertical steel bar 3 to be fully squeezed. Before the polytetrafluoroethylene drawer fixed bin 7 is inserted, firstly, a foam plate 6 with the length and the width of 30 x 153 x 19mm (length reserved part adjusting space) for plugging is plugged into the inner end part of the polytetrafluoroethylene drawer fixed bin 7, and then a polytetrafluoroethylene drawer movable bin 10 is inserted into the polytetrafluoroethylene drawer fixed bin 7. Before the polytetrafluoroethylene drawer movable bin 10 is inserted, the foam plates 8 in the drawer movable bin 10 are paved in advance, the polytetrafluoroethylene drawer movable bin 10 is pushed inwards by utilizing the drawer handles 9, so that the polytetrafluoroethylene drawer movable bin 10 and the foam plates 8 in the polytetrafluoroethylene drawer movable bin are tightly squeezed with the foam plates 6 in the drawer fixed bin in the polytetrafluoroethylene drawer fixed bin 7, and then the polytetrafluoroethylene drawer movable bin 10 and the foam plates 8 in the polytetrafluoroethylene drawer movable bin are pulled out, so that the foam plates 6 in the drawer fixed bin in the polytetrafluoroethylene drawer fixed bin 7 are tightly contacted with the vertical steel bars 3 of the constructional column.
Referring to fig. 1, 2-1 and 2-2, the inner edge of the movable polytetrafluoroethylene drawer 10 drawn out from the fig. 1, 2-1 and 2-2 is required to be flush with the outer edge of the concrete pouring hole 11 penetrating through the upper plate and the lower plate of the fixed polytetrafluoroethylene drawer 7, so that the concrete pouring hole 11 is ensured to completely leak out, the smooth falling of the constructional column concrete at the cavity of the fixed polytetrafluoroethylene drawer 7 is ensured, the pouring of the constructional column 22 concrete is facilitated, and the tight blocking of the four peripheries of the concrete pouring hole 11 is ensured.
After the work is finished, pouring the concrete of the cantilever beam 13 and the concrete of the cantilever beam lower constructional column 22, and when the overflow slurry at the overflow slurry hole 17 on the constructional column template 1 is found, timely and inwards pushing the polytetrafluoroethylene drawer movable bin 10, so that the foam plate 8 in the drawer movable bin is in close contact with the foam plate 6 in the drawer fixed bin again, the drawer movable bin 10 is completely closed, then the movable bin drawer handle 9 is propped, and the drawer fixed bin 7 in the constructional column template 1 is pulled out by using the drawer fixed bin external handle 5.
The overflow holes 17 are blocked, then the foam plates 8 in the drawer movable bin are pressed, and the drawer movable bin 10 is pulled out, so that the foam plates 8 in the drawer movable bin are left at the position of the concrete pouring hole 11, and the isolation of the pouring concrete at the position is completed.
The overflow holes 17 of the constructional column template 1 are timely blocked, the overflow holes 17 are required to be observed by special persons, and are preferably observed cooperatively by caregivers or site management staff when concrete is cast in site, and the drawer movable bin 10 is timely pushed and the overflow holes 17 are timely blocked when the overflow holes 17 overflow.
And reinserting a polytetrafluoroethylene drawer fixing bin 7 at the drawer opening 4 of the next similar constructional column template, and sequentially circulating.
After the constructional column template 1 is removed, the periphery of the top of the constructional column 22 is blocked by adopting flexible materials or foaming materials or low-strength mortar so as to prevent the steel bars from rusting.
The method is adopted, except that a trace amount of mortar is arranged in the gaps among the foam board 6 in the drawer fixed bin, the foam board 8 in the drawer movable bin and the three-face annular battens 2 on the inner side of the top of the constructional column template 1, namely the gaps among the vertical steel bars 3 of the constructional column, the full isolation effect is basically realized between the concrete of the cantilever beam 13 and the concrete of the constructional column 22, and the concrete effect is shown in a detailed schematic diagram of the isolation between the top of the constructional column and the concrete of the cantilever beam in fig. 7.
The invention adopts the process method of synchronous construction of the cantilever beam 13 and the cantilever beam lower constructional column 22 to ensure the construction quality and safety and effectively reduce the construction cost, and by designing an effective method, the cantilever beam 13 and the cantilever beam lower constructional column 22 are fully isolated from each other when the synchronous construction of the cantilever beam 13 and the cantilever beam lower constructional column 22 is realized.
Firstly, by additionally arranging three annular strips 2 on the inner side of the top of the constructional column template 1, the full isolation between the peripheral concrete (the concrete of the reinforced protection layer part) of the constructional column 22 and the concrete of the cantilever beam 13 is achieved; secondly, a drawer opening 4 is reserved at the top of the constructional column template 1 through the position of the constructional column template 1 and the cantilever beam template 14 on the same vertical face, and a high-lubricity drawer fixing bin with a concrete pouring hole 11 and a foam plate 6 in the drawer fixing bin is inserted, so that the up-and-down smooth pouring and the effective sealing of the periphery of constructional column concrete are realized; thirdly, a slurry overflow hole 17 is formed at the position 20-25mm below the drawer opening 4 at the top of the constructional column template 1, when concrete flows out from the slurry overflow hole 17, the drawer movable bin 10 paved with the foam plates 8 in the drawer movable bin is pushed to be closed in time, and the foam plates 8 in the drawer movable bin are removed to complete embedding, so that effective isolation of the subsequent concreting and concreting of the constructional column 22 is completed.
Claims (6)
1. A construction method of a cast-in-situ reinforced concrete cantilever beam lower constructional column is characterized in that,
A. Preparing a constructional column template, forming a drawer opening of a drawer fixing bin on the constructional column template according to the principle that the vertical surfaces of the constructional column template and the cantilever beam template are on the same plane, forming a slurry overflow hole at the lower part of the drawer opening, and additionally arranging three annular battens on the inner sides of the tops of the other three surfaces of the constructional column template;
b. Customizing a drawer fixed bin and a drawer movable bin which can be matched in a drawing way, wherein concrete pouring holes are formed in an upper plate and a lower plate of the drawer fixed bin;
c. Installing a vertical steel bar of a constructional column below the cantilever beam and a constructional column stirrup, and properly adjusting the elevation of the top of the constructional column stirrup, so that the upper part of the constructional column stirrup simultaneously plays a role of a positioning bracket of a drawer fixing bin;
d. Installing a constructional column template and an overhanging beam template under the overhanging beam, reinforcing the constructional column template by adopting a vertical square timber of the constructional column template, a transverse steel timber of the constructional column template, a split bolt sizing block of the constructional column template and a split bolt of the constructional column template, and reinforcing the overhanging beam template by adopting a transverse square timber of the overhanging beam template and a vertical steel timber of the overhanging beam template;
e. The drawer fixing bin is inserted into the position of the opening of the drawer at the top of the constructional column template, the horizontal positioning of the drawer fixing bin is ensured by utilizing the bracket action of the constructional column stirrups and the constructional column template, the drawer fixing bin is abutted against the constructional column vertical steel bars, and the constraint of the three annular battens at the periphery of the constructional column vertical steel bars is utilized to fully squeeze the drawer fixing bin and the constructional column vertical steel bars; before the drawer fixed bin is inserted, firstly, inserting a foam plate in the drawer fixed bin into the inner end part of the drawer fixed bin, paving a foam plate in the drawer movable bin, then inserting a drawer movable bin into the drawer fixed bin, tightly squeezing the drawer movable bin and the foam plate in the drawer movable bin with the foam plate in the drawer fixed bin, and then pulling out the drawer movable bin and the foam plate in the drawer movable bin to ensure that the foam plate in the drawer fixed bin is tightly contacted with the vertical steel bars of the constructional column;
f. The inner edge of the pulled drawer movable bin is required to be flush with the outer edge of the concrete pouring hole penetrating through the upper plate and the lower plate of the drawer fixed bin, so that the complete leakage of the concrete pouring hole and the complete plugging of the periphery of the hole are ensured, and the pouring of constructional column concrete is facilitated;
g. After the work is finished, pouring cantilever beam concrete and cantilever beam lower constructional column concrete, when slurry overflow holes on the constructional column template are found to overflow outwards, timely pushing the drawer movable bin inwards to ensure that a foam plate in the drawer movable bin paved by the drawer movable bin is tightly contacted with a foam plate plugged at the inner end part of the drawer fixed bin again, so that the drawer movable bin is completely closed, and then pushing the drawer movable bin to pull out the drawer fixed bin in the constructional column template;
h. blocking the grout overflow hole, pressing the foam plate in the drawer movable bin, and pulling out the drawer movable bin to leave the foam plate in the drawer movable bin at the position of the concrete pouring hole, thereby completing the isolation of the pouring concrete at the position;
i. The drawer fixing bin is inserted into the drawer opening of the next similar constructional column template again, and the drawer fixing bin is used in a turnover way and sequentially circulated;
the distance between the slurry overflow hole part and the bottom of the drawer fixed bin is 20-25mm so as to match the continuous casting thickness of concrete corresponding to the possible delay time of the drawer fixed bin insertion; the drawer fixed bin and the movable bin are made of polytetrafluoroethylene, and the wall thickness is 2mm.
2. The construction method of the cast-in-situ reinforced concrete cantilever beam lower constructional column according to claim 1, wherein the inner end part of the drawer movable bin is flush with the nearest edge of the concrete pouring hole of the drawer fixed bin in a pulled state, so that the smooth falling of concrete at the concrete pouring hole of the drawer fixed bin is ensured, and the effect of completely blocking the periphery of the hole is achieved.
3. The construction method of the cast-in-situ reinforced concrete cantilever beam lower constructional column according to claim 1, wherein the length of the drawer fixed bin is greater than 140mm of the drawer movable bin, so that the installation requirement of the drawer fixed bin is met, and the drawer movable bin can also serve as a bracket.
4. The construction method of the cast-in-situ reinforced concrete cantilever beam lower constructional column according to claim 1, wherein the construction column template is removed and then the outer periphery of the top of the construction column is blocked by adopting flexible materials or foaming materials or low-strength mortar in time, so that the vertical steel bars of the construction column are prevented from rusting.
5. The construction method of the cast-in-situ reinforced concrete cantilever beam lower constructional column according to claim 1, wherein the drawer fixing bin is a cuboid, and the outer opening of the drawer fixing bin is provided with a U-shaped flanging along the height direction.
6. The construction method of the cast-in-situ reinforced concrete cantilever beam lower constructional column according to claim 1, wherein a drawer handle is arranged on the outer side of the drawer movable bin, and the length and the height of the handle are required to meet the requirement of inserting the drawer fixed bin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910693893.5A CN110295752B (en) | 2019-07-30 | 2019-07-30 | Construction method for cast-in-situ reinforced concrete cantilever beam lower constructional column |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910693893.5A CN110295752B (en) | 2019-07-30 | 2019-07-30 | Construction method for cast-in-situ reinforced concrete cantilever beam lower constructional column |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110295752A CN110295752A (en) | 2019-10-01 |
| CN110295752B true CN110295752B (en) | 2024-05-28 |
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| CN201910693893.5A Active CN110295752B (en) | 2019-07-30 | 2019-07-30 | Construction method for cast-in-situ reinforced concrete cantilever beam lower constructional column |
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Citations (7)
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| CN110295752A (en) | 2019-10-01 |
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