CN113719116A - Laminated floor slab construction method based on aluminum alloy formwork support - Google Patents
Laminated floor slab construction method based on aluminum alloy formwork support Download PDFInfo
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- CN113719116A CN113719116A CN202111081205.3A CN202111081205A CN113719116A CN 113719116 A CN113719116 A CN 113719116A CN 202111081205 A CN202111081205 A CN 202111081205A CN 113719116 A CN113719116 A CN 113719116A
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 116
- 238000009415 formwork Methods 0.000 title claims abstract description 74
- 238000010276 construction Methods 0.000 title claims abstract description 44
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 106
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 106
- 239000002131 composite material Substances 0.000 claims abstract description 70
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 44
- 239000010959 steel Substances 0.000 claims abstract description 44
- 239000004567 concrete Substances 0.000 claims abstract description 39
- 238000000034 method Methods 0.000 claims abstract description 29
- 238000013461 design Methods 0.000 claims abstract description 10
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims description 13
- 239000002390 adhesive tape Substances 0.000 claims description 3
- 239000006260 foam Substances 0.000 claims description 3
- 238000005056 compaction Methods 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 13
- 230000002265 prevention Effects 0.000 abstract description 2
- 239000004411 aluminium Substances 0.000 description 18
- 239000012634 fragment Substances 0.000 description 16
- 238000009434 installation Methods 0.000 description 9
- 238000005452 bending Methods 0.000 description 8
- 230000008901 benefit Effects 0.000 description 5
- 230000007306 turnover Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000010008 shearing Methods 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 239000007787 solid Substances 0.000 description 3
- 239000002023 wood Substances 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
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- 230000002093 peripheral effect Effects 0.000 description 2
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- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 description 1
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000009120 camo Nutrition 0.000 description 1
- 235000005607 chanvre indien Nutrition 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000011487 hemp Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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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
- E04G11/00—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs
- E04G11/36—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs for floors, ceilings, or roofs of plane or curved surfaces end formpanels for floor shutterings
- E04G11/48—Supporting structures for shutterings or frames for floors or roofs
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
- E04B5/16—Load-carrying floor structures wholly or partly cast or similarly formed in situ
- E04B5/17—Floor structures partly formed in situ
-
- 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
- E04G11/00—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs
- E04G11/36—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs for floors, ceilings, or roofs of plane or curved surfaces end formpanels for floor shutterings
- E04G11/48—Supporting structures for shutterings or frames for floors or roofs
- E04G11/50—Girders, beams, or the like as supporting members for forms
-
- 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
- E04G11/00—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs
- E04G11/36—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs for floors, ceilings, or roofs of plane or curved surfaces end formpanels for floor shutterings
- E04G11/48—Supporting structures for shutterings or frames for floors or roofs
- E04G11/50—Girders, beams, or the like as supporting members for forms
- E04G11/52—Girders, beams, or the like as supporting members for forms of several units arranged one after another
-
- 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
- E04G17/00—Connecting or other auxiliary members for forms, falsework structures, or shutterings
- E04G17/001—Corner fastening or connecting means for forming or stiffening elements
-
- 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
- E04G9/00—Forming or shuttering elements for general use
- E04G9/02—Forming boards or similar elements
- E04G9/06—Forming boards or similar elements the form surface being of metal
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
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- Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
Abstract
The invention discloses a construction method of a composite floor slab based on aluminum alloy formwork support, which comprises the following construction steps: s1, construction preparation is carried out, and mold matching design of an aluminum alloy template supporting system is completed; s2, mounting an aluminum alloy template support system; s3, hoisting the composite floor slabs, wherein the composite floor slabs are arranged at the top of the aluminum alloy template supporting system in a hoisting mode and supported by the aluminum alloy template and the keel fixed top, and the composite floor slabs are connected through reserved steel bars on the steel bar binding composite floor slabs; s4, pouring concrete, namely pouring the concrete to the upper part of the laminated floor slab; and S5, dismantling and transferring the aluminum mould keel supporting system, dismantling the aluminum alloy formwork supporting system structure except for the aluminum mould fixed top after concrete curing, and transferring. The aluminum mould keels and the aluminum mould fixed tops are used for supporting the superposed floor slab, when a plurality of aluminum mould fixed tops exist, the aluminum mould keels are connected through the aluminum alloy template, the horizontal stability is guaranteed, and the overturning prevention is realized in the hoisting process.
Description
Technical Field
The invention relates to the technical field of engineering construction, in particular to a construction method of a laminated floor based on aluminum alloy formwork support.
Background
The composite floor slab is an assembled integral floor slab formed by laminating prefabricated slabs and cast-in-place reinforced concrete layers, has the advantages of good integrity, smooth upper and lower surfaces of the slabs, convenience in finishing finish decoration, convenience in construction, good integrity, low energy consumption, low pollution and the like, is suitable for high-rise buildings and large-bay buildings with higher integral rigidity requirements, is widely applied to the assembled buildings due to the advantages of high on-site construction efficiency, good structural performance and the like, and becomes the trend of the global building industry at present, and the composite floor slab is gradually popularized.
In the engineering construction process of the composite floor slab, the composite floor slab of the prefabricated truss reinforcing steel bars is prefabricated in a factory, and after the composite floor slab is hoisted by a tower crane on a construction site, concrete is cast on the upper part of the composite floor slab in situ, so that the construction of the composite floor slab is completed. When the composite floor slab is applied and constructed at present, a traditional supporting system is generally adopted, and consists of a steel support, a U-shaped jacking, a woodwork beam and a stable triangular frame body.
The above disadvantages need to be improved.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a construction method of a laminated floor slab based on aluminum alloy template support.
The technical scheme of the invention is as follows:
a construction method of a composite floor based on aluminum alloy formwork support comprises the following construction steps:
s1, construction preparation is carried out, and mold matching design of an aluminum alloy template supporting system is completed;
s2, mounting an aluminum alloy template support system;
s3, hoisting the composite floor slabs, wherein the composite floor slabs are arranged at the top of the aluminum alloy template supporting system in a hoisting mode and supported by the aluminum alloy template and the keel fixed top, and the composite floor slabs are connected through reserved steel bars on the steel bar binding composite floor slabs;
s4, pouring concrete, namely pouring the concrete to the upper part of the laminated floor slab;
and S5, dismantling and transferring the aluminum mould keel supporting system, dismantling the aluminum alloy formwork supporting system structure except for the aluminum mould fixed top after concrete curing, and transferring.
In the above construction method of the composite floor slab based on the aluminum alloy formwork support, step S1 includes calculation of aluminum formwork keel load, calculation of adjustable steel support load and calculation of floor keel tension rod.
The method for constructing a composite floor slab based on aluminum alloy formwork support includes, in step S2:
step A1, installing a keel fixing top, installing an aluminum mould keel through a floor internal corner C-shaped groove, and then arranging the keel fixing top at a supporting position of the aluminum mould keel through a bolt;
step A2, installing an adjustable steel support;
and step A3, installing the aluminum alloy template, and connecting the aluminum mold keel and the aluminum alloy template by using pin pieces, wherein the abutted seams of all aluminum alloy structures are smaller than 1 mm.
Further, after the aluminum alloy formwork supporting system is completed, the method also comprises the step A4 of attaching a double-sided foam adhesive tape to the joint part of the bottom of the laminated floor and the aluminum alloy supporting system.
The construction method of the composite floor based on the aluminum alloy formwork support comprises the steps that the aluminum alloy formwork support system comprises aluminum formwork keels, aluminum formwork fixed tops, aluminum alloy formworks and adjustable steel supports, the aluminum formwork keels comprise aluminum formwork end keels at two ends and aluminum formwork middle keels arranged in the middle, the aluminum alloy formworks are arranged side by side to form a multi-row structure, and the aluminum formwork keels are arranged between the rows and connected with one another.
Furthermore, a floor keel pull rod is arranged between the aluminum mould keels, a floor support is arranged below the keel pull rod, and the keel pull rod is fixedly connected with the aluminum mould keels through pins at two ends respectively.
Further, the bottom supporting point of the single-piece composite floor slab is not less than 4, and the supporting points are arranged at four corners of a rectangle and are fixed on two adjacent lines of aluminum formwork keels respectively.
Furthermore, the aluminum mould keel and the aluminum alloy template are connected with the surrounding wall or beam through pins, a floor internal corner C-shaped groove is fixed on the wall or beam, and the aluminum mould keel is fixed through the floor internal corner C-shaped groove.
According to the construction method of the composite floor slab based on the aluminum alloy formwork support, the joints in the form of the post-cast strip are arranged between the composite floor slabs.
In the above-mentioned method for constructing a composite floor slab based on aluminum alloy formwork support, in step S4, the concrete is poured first in the main building structures such as wall columns and beams, and then the post-cast strip between the composite floor slabs and the cast-in-place layer concrete of the floor slab are poured in sequence, when the concrete is poured on the composite floor slab, in order to ensure the uniform stress of the composite floor slab and the support, the concrete pouring is performed from the middle to the two sides, the continuous construction is completed in one step, and the vibration of the vibrating bar is used to ensure the compactness of the concrete vibration.
In the construction method of the laminated floor based on the aluminum alloy formwork support, after the steps S2 and S3, the level of the aluminum alloy formwork support system needs to be adjusted by using a level meter or a theodolite, so that the unevenness of the aluminum alloy formwork splicing plates is not more than 2mm, and the laminated floor is on the same plane.
In step S5, the method for constructing a composite floor slab supported by aluminum alloy forms includes removing all the bolts between the aluminum form keels and the aluminum alloy forms, removing the aluminum form keels and the aluminum alloy forms from the joints fixed to the aluminum forms by using special tools, removing the aluminum alloy forms between the aluminum form keels and the C-shaped grooves in the internal corners of the floor, and using the aluminum alloy forms and the aluminum form keels in a circulating manner.
Further, during the turnover, directly with the vertical transmission upwards of aluminum alloy template and aluminum mould fossil fragments, the relation of connection between the aluminum alloy template keeps unchangeable.
According to the scheme, the laminated floor slab has the beneficial effects that the aluminum mould keels and the aluminum mould fixed tops are used for supporting the laminated floor slab, when a plurality of aluminum mould fixed tops exist, the aluminum mould keels are connected through the aluminum alloy template, the horizontal stability is ensured, and the overturning is prevented in the hoisting process. Because under the effect of construction load and use load, the aluminum alloy formwork support system can provide reliable rigidity and bearing capacity in the superimposed sheet bottom, therefore cast-in-place layer construction back is accomplished, and cast-in-place concrete intensity is big, and the aluminum alloy formwork between aluminium mould fossil fragments and the aluminium mould fossil fragments all can be demolishd, only remains aluminium mould solid top and adjustable steel support, and aluminium mould fossil fragments and aluminium mould solid top overlap joint are easy to detach bevel connection, make things convenient for demolishment and the turnover of aluminum alloy formwork support system. In addition, the aluminum mould keel and the aluminum alloy template are connected with the surrounding walls and the beam templates through the pins, and the aluminum alloy has the characteristics of high rigidity and difficult deformation, so that the whole building cast-in-place concrete forming quality can be improved.
1. The strong point of coincide floor all supports through the aluminium mould fossil fragments of aluminum alloy template support system, and its strong point is fixed but the position is more nimble, can practice thrift the part and support quantity, and it is stable to push up admittedly through the aluminium mould, is equivalent to assembled structural support equally, need not on-the-spot unwrapping wire location and fixes a position accurately.
2. The supporting system of the aluminum alloy template consists of an aluminum mould keel, an aluminum mould fixed top and an adjustable steel support, and the stability of the supporting system is good in the process of hoisting the laminated floor slab and the front and rear supporting systems, and the safety coefficient is high.
3. The integral supporting system is assembled, the elevation of the bottom of the slab is easy to monitor, the hoisting time of the composite floor slab is reduced, and the adjustment accuracy of the elevation of the bottom of the composite floor slab is improved.
4. The method for manufacturing the aluminum mould keels with different widths meets the requirements, is suitable for different cast-in-place widths and positioning of the splicing seams of the composite floor slab, greatly reduces slurry leakage of the cast-in-place splicing seams of the composite floor slab, and improves the forming quality of concrete members.
5. The aluminum die keel of the aluminum alloy template supporting system and the aluminum alloy template of the connecting part have high turnover utilization rate and good economic benefit.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic view of the construction process of the present invention.
FIG. 2 is a schematic structural view of an aluminum alloy form support system.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "fixed" or "disposed" or "connected" to another element, it can be directly or indirectly located on the other element. The terms "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positions based on the orientations or positions shown in the drawings, and are for convenience of description only and should not be construed as limiting the technical solution.
A construction method of a composite floor slab based on aluminum alloy formwork support is shown in figure 1, and comprises the following specific construction steps:
s1, construction preparation is carried out, and mold matching design of the aluminum alloy template supporting system is completed.
The method is characterized in that deep design is completed before construction, a professional construction team is selected, construction equipment and tools and other related materials are prepared, construction technicians are organized to carry out technical background communication, detailed and complete requirements are met, and detailed background communication is carried out on key parts and construction difficulty. The design content comprises a die matching design of the aluminum alloy template support system.
As shown in fig. 2, the aluminum alloy formwork support system comprises aluminum formwork keels, aluminum formwork fixed tops, floor keel pull rods, aluminum alloy formworks and adjustable steel supports, the aluminum formwork keels comprise aluminum formwork end keels at two ends and keels arranged in the middle of the aluminum formwork, a plurality of aluminum alloy formworks are arranged side by side to form a multi-row structure, and the aluminum formwork keels are arranged between the rows to be connected. The connecting ends of the two sides of the aluminum formwork fixed top and the aluminum formwork keels are designed to be grooves, the floor keel pull rod is arranged in the grooves, the aluminum formwork keels and the aluminum formwork fixed top are locked through pins, and a keel supporting system can be formed only by at least one aluminum formwork fixed top combination of the two aluminum formwork keels. When the solid top combination of a plurality of aluminium moulds, aluminium mould fossil fragments support the overlength, adopt the aluminum alloy template to connect between two aluminium mould fossil fragments, guarantee the level stability, the hoist and mount process is prevented toppling. Round holes are reserved in the side frames of the aluminum alloy die and the aluminum die keel and are connected with each other through the pin holes.
The self characteristics of combination coincide floor, 4 are no less than to single coincide floor bottom support point, and the support point position is the four corners setting of rectangle, fixes respectively on two adjacent lines of aluminium mould fossil fragments. The supporting point is an aluminum mould fixed top to support the bottom of the composite floor slab. Specifically, the supporting distance is not more than 1200mm, the maximum span of the laminated floor slab is not more than 8000mm, and the supporting system is safe and reliable in the process of hoisting and pouring the laminated floor slab.
Specifically, the width of aluminium mould fossil fragments is 100mm, and aluminium mould fossil fragments length direct influence supports the interval, and aluminium mould end fossil fragments length should not exceed 700mm, and the length of fossil fragments should not exceed 1000mm in the aluminium mould, and the interval of two adjacent lines of aluminium mould fossil fragments of parallel arrangement is not more than 1200 mm. The size of the aluminum mould fixed top is 100 multiplied by 200mm, and the connecting end surface of the aluminum mould fixed top and the aluminum mould keel is an oblique opening, so that the aluminum alloy template supporting system can be conveniently detached. The width of aluminum alloy template is 150mm, and 2 pin joint points are no less than with being connected of aluminium mould fossil fragments, and the length of aluminum alloy template is customized according to the interval of aluminium mould fossil fragments.
Joints in the form of post-cast strips are provided between the laminated floors, the width of the joints typically being 300mm to 350 mm. The aluminum alloy template is customized according to the width of the joint, the length of the aluminum alloy template is not more than 1.2m, the carrying of workers is guaranteed, and the installation is convenient. The quick-release system aluminum alloy template and the aluminum mold fixed top support are designed on two sides of the plate seam, so that the aluminum alloy template of the plate seam can be conveniently dismounted.
The aluminum mould keel and the aluminum alloy template are connected with the peripheral walls and the beam templates through the pins, and the aluminum alloy product has high rigidity and is not easy to deform, so that the integral cast-in-place concrete forming quality of the building can be improved by using the aluminum mould keel and the aluminum alloy template. And in order to prevent the pin sheets from falling off in the concrete pouring process, the pin sheets need to be installed in a downward inclined mode at a certain angle, and tracking inspection is carried out in the concrete pouring process.
A specific calculation procedure of an embodiment:
(1) and (5) calculating the load of the aluminum mould keel.
The maximum thickness of the floor slab is 200 mm;
maximum calculated floor intensity pressure: 1.2 x (25 x 0.2+0.5) +1.4 x 2-9.4 < 10 KN/square meter, the maximum floor strength calculation pressure is less than 10 KN/square meter, and the calculation is carried out according to 10 KN/square meter;
maximum calculated pressure of floor deflection: and Q is 25 multiplied by 0.2+0.5+2, 7.5 is less than 10KN per square meter, the floor deflection is not full of 10KN per square meter, and the calculation is carried out according to the 10KN per square meter.
The roof structure middle beam is a section structure, the total length is 1120mm, the total width is 100mm, two ends of the roof structure middle beam are supporting points, the middle beam body is uniformly stressed, and the strength calculation is carried out according to the section structure.
The width b of the upper surface of the middle beam is 100;
the total height h of the section is 70 mm;
each middle beam has the bearing width B of 1200+100 of 1300 mm;
calculating the span L is 960 mm;
the section moment of inertia Ix is 982017.17mm4；
Section bending modulus Wx is 23777.66mm3；
Cross-sectional area A1534 mm2；
Calculating the load qk-PB-13 KN/m;
maximum bending moment Mmax of qkL2/8＝1.5KN·m；
The maximum bending stress w is Mmax/Wx is 62.98MPa, is less than the standard 215MPa, and meets the requirement;
the maximum shearing force F of the fulcrum is qkL/2 and 6.24 KN;
the maximum shearing stress t is F/A is 4.07MPa less than 95MPa, and the requirement is met;
the deflection calculation load WQ is equal to QB and equal to 13 KN/m;
maximum deflection
Meets the requirements.
(2) And calculating the support load of the adjustable steel.
The adjustable steel support is an inner sleeve type steel support and an outer sleeve type steel support, and the sleeve sleeves the insertion pipe. Selecting a phi 48 steel pipe with a weaker section, calculating, wherein the size of the inserting pipe is phi 48 multiplied by 2.5, the size of the sleeve pipe is phi 60 multiplied by 2.2, the height of the floor is 3000mm, the height of the supporting head is 130mm, the thickness of the floor is 200mm, and the distance L1 multiplied by L2 between supporting points on the adjustable steel support is 1300mm multiplied by 1300 mm. Consider that the eccentric center of the upper and lower ends of the cannula and the sleeve is 1/2 steel tube diameter due to fit clearance and installation error. The stress point of the adjustable steel support is a vertical acting force with the end part parallel to the axis from top to bottom, and the bottom of the adjustable steel support has an upward supporting force.
The maximum thickness of the floor slab is 200 mm;
maximum calculated floor intensity pressure: 1.2 x (25 x 0.2+0.5) +1.4 x 2-9.4 < 10 KN/square meter, the maximum floor strength calculation pressure is less than 10 KN/square meter, and the calculation is carried out according to 10 KN/square meter;
maximum calculated pressure of floor deflection: and Q is 25 multiplied by 0.2+0.5+2, 7.5 is less than 10KN per square meter, the floor deflection is not full of 10KN per square meter, and the calculation is carried out according to the 10KN per square meter.
A single supporting load N is P multiplied by L1 multiplied by L2 is 15.89 KN;
section A388.6 mm2；
Bending modulus W1x ═ 3864.8mm3；
Radius of gyration
Axial compression stability factor
The equivalent bending moment coefficient beta mx is 1;
the eccentric bending moment value Mx is equal to NxD/2 is equal to 381.26 N.m;
critical force of Euler
Calculating according to a tool type steel pipe support compression stability calculation formula:
(3) And calculating the floor keel pull rod.
The keel pull rod is arranged between the two aluminum mould keels, the floor support is arranged below the keel pull rod, and the keel pull rod is fixedly connected with the aluminum mould keels through pins at two ends respectively.
The shearing stress of each keel pull rod is 3.03/2 which is 1.52 KN;
the effective shearing force area of the keel pull rod is 500m/m2；
Allowable shear stress 0.6Pt 0.6x160 96N/mm2>3.04N/mm2
The keel pull rod pin is phi 16mm,
allowable pin shear stress of 102N/mm2>30.25N/mm2And (6) qualified.
And S2, installing an aluminum alloy template supporting system.
Step A1, installing a keel fixed top.
After the cast-in-place partial wall beam formwork is installed, a floor internal corner C-shaped groove is installed at the top of the cast-in-place partial wall beam formwork to prepare for erecting an aluminum formwork keel. The aluminum mould keel is integrally connected with the fixed top on the operation layer according to the length of a drawing, the two ends of the aluminum mould keel are simultaneously placed to the installation height, the aluminum mould keel is connected with the C-shaped groove of the inner corner of the floor through a pin, and then the aluminum mould is fixedly connected with the fixed top at the designed supporting point of the aluminum mould keel through a bolt.
And A2, installing an adjustable steel support.
After the single-row aluminum mould keel is installed in place, the adjustable steel support is installed in time, the adjustable steel support is adjusted to the fixed top height, and the vertical looseness is avoided. And after the adjustable steel supports are installed, installing a connecting template between the aluminum mould keels and utilizing an infrared level meter to assist in adjusting the height of the bottom of the laminated floor slab.
And A3, installing the aluminum alloy template.
According to the design structure, the pin sheet is used for connecting the aluminum mould keel and the aluminum alloy template, and the abutted seams of all aluminum alloy structures are required to be within 1 mm. After adjustable steel shotcrete installation is accomplished, installation aluminum alloy template utilizes the infrared ray spirit level to assist and adjusts to coincide floor slab bottom elevation, and aluminum alloy template mosaic plate department unevenness is not more than 2mm, and the plane for the flatness 2m ruler inspection is not more than 3 mm.
And step A4, slurry leakage prevention measures are taken.
Because the prefabricated part of the composite floor slab has processing errors and hoisting precision errors, the slurry leakage phenomenon occurs when the bottom of the composite floor slab and the cast-in-place lap joint part at the periphery are poured. In order to improve the phenomenon, a 2mm double-sided foam adhesive tape is pasted at the joint part of the bottom of the laminated floor and the aluminum alloy supporting system.
And S3, hoisting the laminated floor slab.
When the composite floor slab is hoisted, the hoisting point position is based on the deepened design drawing or the hoisting point position marked by the prefabricated members in the approach, and the hoisting point position cannot be changed randomly. Regarding the number of the lifting points, 4 lifting points are arranged on the prefabricated composite floor slab with the length and the width smaller than 4000mm, and the lifting points are positioned in the directions of four corners of the composite floor slab; the size of the composite floor slab is more than 4000mm, 6-8 hoisting points are arranged, and the hoisting points are symmetrically distributed, so that the uniform stress and the stable hoisting are ensured during the hoisting of the member. When in lifting, the test lifting is carried out, the lifting is stopped at a distance of 50 cm from the ground, the stress condition of the steel wire rope and the lifting hook is checked, the laminated floor slab is kept horizontal, and then the laminated floor slab is lifted to the upper space of an operation layer. And when the composite floor member is lifted, the horizontal included angle of the sling is not less than 60 degrees, namely the length of the steel wire rope of the composite floor member is not less than 3 m. When the composite floor slab is lifted, the bending moment generated by self weight in the non-prestressed direction needs to be reduced, and 3m hemp ropes are adopted as traction ropes for facilitating the plate to be in place during lifting. When the composite floor slab is in place, the composite floor slab is vertically installed downwards from the top, a pause is slightly made at a position 30cm above an operation layer, a constructor holds the floor slab to adjust the direction, the side line of the composite floor slab is aligned with the installation position line on the wall, the reserved steel bars on the composite floor slab are prevented from interfering with the steel bars of the wall body, the composite floor slab is stopped stably and slowly placed when the composite floor slab is placed down, and the composite floor slab is strictly forbidden to be quickly and violently placed, so that the face of the slab is prevented from being cracked due to overlarge impact force. When the position of the board is adjusted, small wood blocks are padded, a crowbar is not required to be directly used, so that the corner of the board is prevented from being damaged, the shelf length is ensured, and the allowable deviation is not more than 5 mm. When the crowbar is used, the end part of the crowbar is wrapped by cotton cloth so as to avoid damaging the laminated floor slab. And after the composite floor slab is installed, performing elevation check and adjusting the adjustable steel support below the composite floor slab.
And (4) hoisting the composite floor slabs, fixing, and adjusting the integral elevation to ensure that all the composite floor slabs are at the same height. The method comprises the following specific steps:
and B1, binding steel bars.
The reserved steel bars between the laminated floors are connected with each other in a lap-joint binding mode, the lap-joint length of the steel bars meets the design requirement, lap-joint joints are staggered, and the staggering rate is 50%. And during binding, straightening according to the line arrangement of the arranged intervals on the aluminum alloy template, and binding. The reserved steel bars are stressed in two directions, binding cannot be missed, the binding buckles are splayed, and after binding is finished, binding wires swing heads towards the inside of the plate. The distance between the end of the overlap length and the bending part of the steel bar is not less than 10 times (10d) of the diameter of the steel bar.
And B2, adjusting elevation.
Before concrete pouring, the laser level and the theodolite are used for checking and adjusting the horizontal elevation of the whole composite floor slab supporting system again, and the independent steel supports are adjusted at the same time when the elevation is adjusted, so that the same height is ensured.
And S4, pouring concrete.
When concrete is poured, building main structures such as wall columns and beams are poured firstly, then post-cast strips (seams) between the superposed floors and cast-in-place layer concrete of the floors are poured in sequence, when the concrete is poured on the superposed floors, in order to ensure that the superposed floors and the supporting stress are uniform, the concrete is poured from the middle to two sides, continuous construction is completed at one time, and simultaneously, a vibrating bar is used for vibrating, so that the concrete is guaranteed to be vibrated compactly. All columns and shear walls of the building main body are poured for 2-3 times, layered and circularly poured from bottom to top, the pouring height is ensured not to exceed 2 meters each time, and the columns and the shear walls are vibrated uniformly in the pouring process. It is noted that the vertical concrete pump pipe cannot be in hard contact with the aluminum alloy template, the pump pipe must be fixed at two layers below the working surface, and the pump pipe on the floor needs to be shockproof by a rubber cushion.
And S5, dismantling and transferring the aluminum formwork keel supporting system.
According to the early-dismantling system of the aluminum alloy formwork, after concrete pouring and curing are completed, the top formwork can be dismantled when the strength of the concrete reaches 50% of the designed strength, the aluminum alloy formwork part can be dismantled after the concrete is poured for 48 hours in non-winter construction, and only the top is kept to be fixed. And (3) sequentially removing peripheral connecting pins from the aluminum mould keels, slightly prying the connecting position of the end part of the aluminum mould keel and the fixed top of the aluminum mould, finally removing the aluminum alloy template between the aluminum mould keels and the floor internal corner C-shaped groove, and circularly using the aluminum alloy template. When the aluminum mould supporting system is dismantled, the dismantled aluminum mould keel and the bolt of the aluminum alloy mould are completely dismantled, a special tool (a mould dragging device) is applied to dismantle from the middle part of the wall, and then the dismantling is carried out towards two sides. If the aluminum alloy template needs to be circulated for use, the aluminum alloy template is required to be numbered according to the position sequence after the first section is installed, and the aluminum alloy template is directly vertically transferred upwards during circulation, and the aluminum alloy template at the same position is kept unchanged. The form removal must be done once and no unsupported form must be left. And (3) before each turnover installation, floating slurry on the contact surface of the aluminum alloy template and the concrete is removed, and then turnover installation is carried out.
In addition, in any step, two components are connected, the connecting structure cannot be less than two pins, and the distance between the pins cannot exceed 300 mm.
Compared with the traditional composite floor slab supporting system, the traditional woodwork I-beam is changed into the aluminum alloy template keel quick-dismantling system, after the concrete pouring is completed and the initial setting strength is reached, only the steel support and the aluminum mold are left for fixing the top, and the rest templates can be rotated, so that the material input quantity is reduced, and the direct cost is saved; the aluminum mould keel support frame body has good stability without additionally arranging a stabilizing tripod; the aluminum mould fossil fragments support system is the wholeness installation timing, practices thrift the cost of labor than traditional support body, and comprehensive economic benefits has great improvement.
In one embodiment, the engineering building is a 28-storey building, the area of the built templates is calculated according to the actual contact area of the bottom of the laminated floor slab, 3 layers of independent supports and wood character beams are configured in the PC independent support construction process, the material cost is at least 164400 yuan per investment, so the number of used floors is less, the material price is higher, and the specific unit price is compared as follows:
in addition, compared with a PC independent support construction process and a traditional wood formwork full-frame support construction process, the construction period of the invention is saved: and the total economic benefit is higher when the number of the 1 (d)/28 layers is 28 days.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A construction method of a laminated floor based on aluminum alloy formwork support is characterized by comprising the following construction steps:
s1, construction preparation is carried out, and mold matching design of an aluminum alloy template supporting system is completed;
s2, mounting an aluminum alloy template support system;
s3, hoisting the composite floor slabs, wherein the composite floor slabs are arranged at the top of the aluminum alloy template supporting system in a hoisting mode and supported by the aluminum alloy template and the keel fixed top, and the composite floor slabs are connected through reserved steel bars on the steel bar binding composite floor slabs;
s4, pouring concrete, namely pouring the concrete to the upper part of the laminated floor slab;
and S5, dismantling and transferring the aluminum mould keel supporting system, dismantling the aluminum alloy formwork supporting system structure except for the aluminum mould fixed top after concrete curing, and transferring.
2. The method for constructing a composite floor slab based on aluminum alloy formwork support as claimed in claim 1, wherein the step S1 includes aluminum formwork keel load calculation, adjustable steel support load calculation and floor keel tension rod calculation.
3. A method for constructing a composite floor slab based on the aluminum alloy formwork support as claimed in claim 1, wherein the step S2 comprises:
step A1, installing a keel fixing top, installing an aluminum mould keel through a floor internal corner C-shaped groove, and then arranging the keel fixing top at a supporting position of the aluminum mould keel through a bolt;
step A2, installing an adjustable steel support;
and step A3, installing the aluminum alloy template, and connecting the aluminum mold keel and the aluminum alloy template by using pin pieces, wherein the abutted seams of all aluminum alloy structures are smaller than 1 mm.
4. The method for constructing the composite floor slab based on the aluminum alloy formwork support as claimed in claim 3, wherein after the aluminum alloy formwork support system is completed, the method further comprises step A4. attaching a double-sided foam adhesive tape to the joint part of the bottom of the composite floor slab and the aluminum alloy support system.
5. The method as claimed in claim 1, wherein the aluminum alloy form support system comprises aluminum form joists, aluminum form fixed tops, aluminum alloy forms and adjustable steel supports, the aluminum form joists comprise aluminum form end joists at two ends and aluminum form middle joists arranged in the middle, the plurality of aluminum alloy forms are arranged side by side to form a multi-row structure, and the aluminum form joists are arranged between the rows to connect the rows.
6. The method of constructing a composite floor based on the aluminum alloy form supports as claimed in claim 5, wherein floor keel pull rods are arranged between the aluminum form keels, floor supports are arranged below the keel pull rods, and the keel pull rods are respectively fixedly connected with the aluminum form keels through pins at both ends.
7. A construction method of a laminated floor slab based on aluminum alloy formwork support as claimed in claim 5, wherein the aluminum formwork keel and the aluminum alloy formwork are connected with the surrounding wall or beam through pins, the wall or beam is fixed with a floor inside corner C-shaped groove, and the aluminum formwork keel is fixed through the floor inside corner C-shaped groove.
8. The method of claim 1, wherein in step S4, the concrete is poured by first pouring the main building structures such as wall columns and beams, and then pouring the post-cast strip between the composite slabs and the cast-in-place concrete layer of the slabs, and when pouring the concrete on the composite slabs, the concrete is poured from the middle to the two sides for uniform stress of the composite slabs and the support, and the construction is continuously completed in one step, and the concrete is vibrated by the vibrating bar for compaction.
9. The method as claimed in claim 1, wherein after steps S2 and S3, the aluminum alloy form support system is adjusted in elevation by level gauge or theodolite, so that the unevenness of the aluminum alloy form joint plate is not greater than 2mm and the composite floor slab is on the same plane.
10. A laminated floor construction method based on aluminum alloy formwork support as claimed in claim 1, wherein in step S5, all the plugs between the removed aluminum formwork keels and the aluminum alloy formwork are removed, a special tool is used to remove the aluminum formwork keels and the aluminum alloy formwork from the joints fixed with the aluminum formwork, finally the aluminum alloy formwork between the aluminum formwork keels and the floor reentrant corner C-shaped grooves are removed, and the aluminum formwork keels are used in circulation.
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