CN110965685A - Construction method of prestressed thick plate hollow floor - Google Patents
Construction method of prestressed thick plate hollow floor Download PDFInfo
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- CN110965685A CN110965685A CN201911174270.3A CN201911174270A CN110965685A CN 110965685 A CN110965685 A CN 110965685A CN 201911174270 A CN201911174270 A CN 201911174270A CN 110965685 A CN110965685 A CN 110965685A
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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
- 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
- E04B5/32—Floor structures wholly cast in situ with or without form units or reinforcements
- E04B5/326—Floor structures wholly cast in situ with or without form units or reinforcements with hollow filling elements
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C1/00—Building elements of block or other shape for the construction of parts of buildings
- E04C1/24—Elements for building-up floors, ceilings, roofs, arches, or beams
- E04C1/34—Elements for building-up floors, ceilings, roofs, arches, or beams designed for use as filling elements
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C1/00—Building elements of block or other shape for the construction of parts of buildings
- E04C1/24—Elements for building-up floors, ceilings, roofs, arches, or beams
- E04C1/34—Elements for building-up floors, ceilings, roofs, arches, or beams designed for use as filling elements
- E04C1/38—Elements for building-up floors, ceilings, roofs, arches, or beams designed for use as filling elements in ribbed or cross-ribbed floors, ceilings, or roofs consisting of reinforced concrete
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Abstract
The invention relates to a construction method of a prestressed thick plate hollow floor, which deepens the geometric dimension and the arrangement parameters of a built-in hollow square box according to the design parameters of the hollow floor; determining the arrangement parameters of the anti-floating lacing wires; installing a template; positioning and scribing the positions of the hidden beam, the column cap, the multi-ribbed beam, the high-strength alloy square box and the reserved embedded facilities; installing hidden beams, column cap reinforcements, plate bottom reinforcements, prestressed reinforcements and reserved embedded facilities; connecting the plate bottom steel bars with the bottom template; laying a positioning device at the bottom of the hollow square box; laying a hollow square box; laying an anti-floating steel bar layer and placing an upper positioning device; connecting the upper positioning device with the plate bottom steel bars; placing a plate top steel bar cushion block, laying and binding plate top steel bars on the plate top steel bar cushion block, and tying the plate top layer steel bars and the plate bottom steel bars through tie bars; pouring concrete, vibrating and maintaining; pre-stressed tensioning, grouting and anchor sealing; and (5) removing the template. The invention can improve the construction quality of the prestressed hollow floor system and reduce the difficulty of field construction.
Description
Technical Field
The invention belongs to the technical field of hollow floor construction, and particularly relates to a construction method of a prestressed thick plate hollow floor.
Background
With the further improvement of the using function of modern buildings, the requirements for large space and beamless construction are increasingly improved. As a novel structural system, the cast-in-place concrete hollow floor has the characteristics of material saving, energy saving, sound insulation, earthquake resistance, flexible space, self weight reduction, cost reduction and the like, well meets the current building requirements, and is developed rapidly. Especially, the prestressed cast-in-place concrete hollow floor system combined with the prestressing technology can provide larger building space, has good economic benefit and social value and has very wide market prospect.
However, compared with the construction of the traditional common floor, the structure has the phenomena of floating and displacement of the built-in hollow box, deviation of the displacement of the prestressed tendon and the like, so that the geometrical sizes of the rib beam and the upper and lower plates of the floor and the space positioning of the prestressed tendon have large deviation, the stress performance of the floor is greatly reduced in serious conditions, and the engineering quality accident is directly caused.
Disclosure of Invention
The invention aims to solve the technical problem of providing a construction method of a prestressed thick plate hollow floor, which improves the construction quality and reduces the field construction difficulty.
The technical scheme adopted by the invention for solving the technical problem is to provide a construction method of a prestressed thick plate hollow floor, which comprises the following steps:
(1) deepening the geometric dimension and the arrangement parameters of the built-in hollow square box according to the design parameters of the thick plate hollow floor;
(2) calculating the anti-buoyancy force of the built-in hollow square box according to the deepening parameters in the step (1), and determining the arrangement parameters of anti-buoyancy tie bars;
(3) building a floor formwork support and installing a formwork;
(4) carrying out plane positioning and scribing on the positions of the hidden beam, the column cap, the multi-ribbed beam, the high-injection alloy square box and the reserved embedded facilities on the template;
(5) installing hidden beams, column cap reinforcements, plate bottom reinforcements, prestressed reinforcements and reserved embedded facilities;
(6) connecting the plate bottom steel bars with the bottom formwork by using a first connecting piece according to the anti-floating bar parameters determined in the step (2);
(7) laying a positioning device at the bottom of the hollow square box;
(8) laying a hollow square box;
(9) laying an anti-floating reinforcing steel bar layer on the upper parts of the hollow square boxes, and placing an upper positioning device in the middle of the rib beam between the hollow square boxes;
(10) connecting the upper positioning device with the bottom plate steel bars by using a second connecting piece to limit the floating of the hollow square box;
(11) placing a plate top steel bar cushion block, laying and binding plate top steel bars on the plate top steel bar cushion block, and tying the plate top layer steel bars and the plate bottom steel bars through tie bars;
(12) after the acceptance is qualified, pouring concrete, vibrating and maintaining;
(13) after the strength design requirement is met, pre-stressed tensioning, grouting and anchor sealing are carried out;
(14) and (5) removing the template.
The hollow square box is assembled by upper case and below case and is constituteed, the top of upper case and the bottom of below case are equipped with cross recess, the side of upper case and below case is equipped with the isosceles trapezoid recess respectively, the hollow chamber of circular cone that link up about upper case and below case are equipped with along the axis, the bight and the limit portion of upper case and below case are the circular arc transition, the bottom of upper case and the top of below case are equipped with the stiffening rib that stretches out along circumference, even interval is equipped with corresponding complex location male fastener and location female fastener on the strengthening rib of upper case and below case, upper case and below case carry out the lock through location male fastener and location female fastener and assemble.
And (3) when the anti-buoyancy of the hollow square box is analyzed in the step (2), establishing a three-dimensional model for analysis by adopting a finite element analysis method, wherein the determined arrangement parameters of the anti-floating tie bar comprise the arrangement point coordinates of the anti-floating tie bar, the diameter and the material of the anti-floating tie bar.
When the bottom plate reinforcing steel bars are installed, bottom plate reinforcing steel bar cushion blocks are laid at the intersection of the longitudinal and transverse bottom plate reinforcing steel bars, the bottom plate reinforcing steel bar cushion blocks are cylinders and are provided with grooves which are vertically crossed, the inner diameters of the grooves are matched with the diameters of the bottom plate reinforcing steel bars, and the distance between the bottoms of the grooves and the bottoms of the bottom plate reinforcing steel bar cushion blocks is equal to the thickness of the bottom plate reinforcing steel bar protective layers.
When the prestressed tendon is installed, the prestressed tendon positioning device is used for positioning, the prestressed tendon positioning device is made of steel bars, the lower portion of the prestressed tendon positioning device is L-shaped, the top of the prestressed tendon positioning device is spiral, the spiral inner diameter and the distance of the spiral inner diameter are matched with the outer diameter of the prestressed tendon, the prestressed tendon is fixed by winding the spiral at the top of the prestressed tendon positioning device and binding the prestressed tendon, the L-shaped lower portion of the prestressed tendon is fixed with the lacing wire, and the length of the L-shaped prestressed tendon is prefabricated according to the control height of the position of the prestressed tendon.
First connecting piece is the iron wire, the position, diameter and the material that set up of iron wire are calculated by step (2) and are confirmed, the reinforcing bar on bottom of the board reinforcing bar upper strata is walked around to the iron wire, and drilling on the template that corresponds the position below implements ligature and end of the connecting plate reinforcing bar and die block board after perforating with the iron wire.
Hollow square chest bottom positioner comprises the spacer that mutually perpendicular set up, the spacer includes flute profile reinforcing bar and support stirrup, the flute profile reinforcing bar is U type and the outer book of upper end level, support stirrup welding in the bottom of flute profile reinforcing bar, the bottom of hollow square chest is located to the spacer cover to with the outer upper and lower panel muscle lacing wire ligature connection of folding end and hollow square chest between the rib roof beam department of flute profile reinforcing bar, with stirrup and board bottom reinforcement ligature connection.
The upper portion positioner is the recess phase-match of a few font reinforcing bars and width and hollow square chest side, upper portion positioner's top is equipped with the crotch, upper portion positioner stretches into the recess of hollow square chest side and utilizes the crotch to hang and establish on anti floating reinforcement.
The second connecting piece is the iron wire, the one end of second connecting piece is fixed the bight, the other end of several font reinforcing bars are fixed on the lower floor's of corresponding lower part board bottom reinforcing bar, open at the stiffening rib middle part of hollow square chest circumference has the notch, the second connecting piece passes from the notch.
The plate top steel bar cushion block is a cylinder and is provided with vertically crossed grooves, the inner diameter of each groove is matched with the diameter of the plate top layer steel bar, and the distance between the bottom of each groove and the bottom of the plate top steel bar cushion block is equal to the distance between the plate top layer steel bar and the hollow square box.
Advantageous effects
The invention starts from the aspects of geometric design of the built-in square box, an anti-floating and positioning system of the built-in square box, positioning of the prestressed tendon and the like, reduces the difficulty of field construction of the hollow floor and improves the construction quality.
Firstly, the top surface and the side surface of the adopted hollow square box are both provided with grooves, and a hollow cone is arranged in the middle of the adopted hollow square box, so that the square box has higher integral rigidity and stronger anti-deformation capability, and the geometrical sizes of the rib beams and the plates of the hollow floor can be effectively ensured; the whole square box is formed by combining an upper half square box and a lower half square box, the half square boxes are connected through the positioning fastener, rapid butt joint can be realized, dislocation is not easy to occur, overlapping stacking can be realized, the space for loading during transportation is reduced, and transportation is facilitated; the square box corner and the side part are arc-shaped, so that concrete can flow into the square box bottom, meanwhile, a hollow cone is arranged in the middle of the square box, air is easily discharged in time when the concrete at the bottom of the square box is poured, and the bottom concrete pouring quality is guaranteed.
Secondly, the finite element method is adopted to calculate the anti-floating and deformation of the square box in the concrete building process, the calculation is more scientific and reasonable than the traditional simplified formula, more comprehensive data can be obtained, the anti-floating strength can be checked, meanwhile, the displacement deformation which can not be obtained by the traditional simplified formula calculation can be obtained, the reliability of an anti-floating system is ensured, and the deformation of the square box in the concrete building process can be further reduced,
Thirdly, the square box bottom positioning device is made of special steel bars, is simple and reliable, is convenient to construct, is beneficial to concrete flowing compared with the existing concrete cushion block, is not easy to be knocked down or displaced during concrete pouring, and is more accurate in positioning; the square box top positioning device is convenient to install, simple and reliable, and is connected with the anti-floating steel bars and the bottom plate steel bars, so that double functions of horizontal positioning and anti-floating are achieved; the vertical grooves are formed in the upper portions of the bottom plate reinforcing steel bars and the top plate reinforcing steel bar cushion blocks, the vertical grooves can be tightly combined with the reinforcing steel bars, the reinforcing steel bars are not easy to displace and fall off when concrete is poured, and the space positioning of the reinforcing steel bars is effectively guaranteed.
Fourth, the special positioner simple accurate of prestressing tendons that adopts, upper portion adopt the spiral, both can conveniently penetrate the prestressing tendons, can realize 360 degrees omnidirectional location on the perpendicular again, and the lower part is L shape simultaneously, both convenient fixed with the drawknot muscle, convenient and the direct contact location of template again, can realize the accurate positioning of prestressing tendons, the off-position in the concrete placement when avoiding the construction in the traditional locate mode.
Compared with the construction method of the existing hollow floor, the method overcomes the defect of experience estimation of the traditional square box anti-floating, realizes accurate control of the concrete pouring process, reduces the field construction difficulty and the working strength of workers, can effectively ensure the space positioning of the square box and the prestressed tendon, ensures the concrete pouring quality of the bottom of the square box, ensures the forming precision of key parts such as a rib beam, an upper plate, a lower plate and the like, effectively reduces the comprehensive construction cost of engineering, and greatly accelerates the construction progress.
Drawings
FIG. 1 is a schematic layout of a hollow square box according to an embodiment of the present invention.
FIG. 2 is a schematic diagram of an arrangement of the floating point resistance of the hollow square box according to the embodiment of the present invention.
FIG. 3 is a schematic view of an anti-floating system of the hollow square box according to the embodiment of the invention.
Fig. 4 is a schematic structural diagram of the bottom steel bar and the top steel bar cushion block of the slab in the embodiment of the invention.
Fig. 5 is a schematic structural diagram of a tendon positioning device according to an embodiment of the present invention.
FIG. 6 is a schematic structural diagram of a positioning device for the bottom of a hollow square box according to an embodiment of the present invention.
FIG. 7 is a schematic diagram of assembling the hollow square box according to the embodiment of the invention.
FIG. 8 is a schematic bottom structure view of a semi-hollow square box according to an embodiment of the present invention.
FIG. 9 is a schematic top view of a semi-hollow square box according to an embodiment of the present invention.
FIG. 10 is a schematic side view of a semi-hollow square box according to an embodiment of the present invention.
Fig. 11 is a schematic structural view of a positioning male fastener and a positioning female fastener on a semi-hollow square box according to an embodiment of the invention.
Fig. 12 is a schematic structural diagram of an upper positioning device according to an embodiment of the present invention.
FIG. 13 is a schematic structural view of a middle notch of a reinforcing rib at the periphery of a semi-hollow square box according to an embodiment of the invention.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
The embodiment of the invention aims at a prestressed hollow floor, as shown in figure 1, the length of the prestressed hollow floor is 8.4m, the width of the prestressed hollow floor is 8.4m, the thickness of the integral floor is 650mm, the thicknesses of an upper plate and a lower plate are both 125mm, the width of a rib beam is 100mm, the clear distance between two ribs is 400mm, and prestressed ribs are arranged in the middle of the rib beam. The construction method of the prestressed thick plate hollow floor comprises the following steps:
And 2, calculating the anti-floating stress condition of the built-in hollow square box by using finite element software according to the deepening parameters in the step 1, and determining anti-floating lacing wire parameters. Finally, the bottom anti-floating point f1 is determined to be a grid-jumping arrangement, as shown in FIG. 2.
And 3, building a floor formwork support, installing a batten m1, and installing a formwork m2, as shown in fig. 3.
And 4, carrying out plane positioning and scribing on the positions of the hidden beam, the column cap, the multi-ribbed beam, the high-injection alloy square box, the reserved embedded facilities and the like on the template m 2.
And 5, mounting the hidden beam, the column cap rib, the slab bottom steel bars b1 and b2, reserving pre-buried facilities and the like. When the bottom plate reinforcing steel bars b1 and b2 are installed, bottom plate reinforcing steel bar cushion blocks are paved at the intersections of the longitudinal and transverse bottom plate reinforcing steel bars. As shown in fig. 4, the bottom plate steel bar cushion block is a cylinder, the upper part of the bottom plate steel bar cushion block is provided with two grooves d2 which are crossed vertically and horizontally, the diameter of each groove is slightly larger than that of the bottom plate steel bars b1 and b2, and the clear distance between the bottom of each groove and the bottom d1 of the cylinder is equal to the thickness of the bottom plate steel bar protection layer. As shown in FIG. 5, when the tendon is installed, firstly, the upper spiral y1-1 of the special positioning device y1 for the tendon penetrates into the tendon, and then the lower L-shaped y1-2 is fixed with the tie bar L1, wherein the height of the L-shaped y1-2 is prefabricated according to the control height of different positions of the tendon.
And 6, according to the anti-floating bar parameters determined in the step 2, as shown in fig. 3, penetrating the bottom steel bars b1 and b2 at the anti-floating point f1 through the bottom formwork m2 at the intersection point by using a first connector iron wire t1, connecting the bottom steel bars to the lower batten m1, and fixing the bottom steel bars tightly.
And 7, laying a hollow square box bottom positioning device. As shown in fig. 6, the bottom positioning device is composed of two positioning plates which are arranged perpendicular to each other, the positioning plates comprise a channel-shaped steel bar z1 and two supporting stirrups z2, after the upper end part of the channel-shaped steel bar is horizontally folded outwards for 90 degrees, the supporting stirrups are welded at the bottom of the channel-shaped steel bar, and the stirrups are welded at positions which are far away from the bottom end part 1/4 of the channel-shaped steel bar. The end of the positioning piece is connected with the lacing wire l1 of the upper and lower panel bars at the rib beam between the hollow square boxes in a binding way, and the supporting stirrup z2 is connected with the bottom steel bar b1 or b2 in a binding way.
And 8, paving the built-in hollow square box. The hollow square box is formed by assembling an upper box and a lower box, as shown in figure 7. As shown in fig. 8-10, cross-shaped grooves 4 are formed in the top of the upper box and the bottom of the lower box, isosceles trapezoid grooves 3 are formed in the side faces of the upper box and the side faces of the lower box respectively, conical hollow cavities 5 which are communicated up and down are formed in the upper box and the lower box along the central axis, and the corners and the edges of the upper box and the lower box are in circular arc transition. The bottom of upper side case and the top of below case are equipped with the stiffening rib 6 that stretches out along circumference, and even interval is equipped with two sets of location male fastener 1 (as figure 11) and the location female fastener 2 (as figure 11) that correspond the complex on the stiffening rib 6 of upper side case and below case, and upper side case and below case carry out the lock through location male fastener 1 and location female fastener 2 and assemble.
And 9, as shown in figure 3, paving an anti-floating reinforcing steel bar layer k1 on the upper parts of the hollow square boxes G1, and placing an upper positioning device j1 in the middle of the rib beams between the hollow square boxes G1. As shown in fig. 12, the upper positioning device j1 is a steel bar with a shape of a Chinese character ji, the diameter of the steel bar is 10mm, a hook is arranged at the end part of the steel bar, the hook extends into the groove 3 on the side surface of the hollow square box and is hung on the anti-floating steel bar k1 by the hook, and the width of the positioning device j1 is equal to the distance of the groove 3 between the hollow square boxes.
Step 10, as shown in fig. 3, the corners of the upper positioning device j1 are connected with the bottom rebars b1 or b2 using a second connector wire t2 to limit the hollow square box from floating up. As shown in fig. 13, an iron wire t2 is connected to the bottom reinforcing steel bar b1 or b2 through a groove c1 at the side of the hollow square box.
step 12, after the acceptance is qualified, pouring concrete, vibrating and curing;
step 13, after the strength meets the design requirement, pre-stressed tension, grouting and anchor sealing are carried out;
and 14, removing the template.
According to the integral scheme, the rigidity of the built-in square box is effectively guaranteed by geometrically designing the built-in square box in advance, on the premise of convenient transportation, the semi-square box is ingeniously and accurately and quickly butted on site through the special concave-convex clamping groove design, and meanwhile, the fluidity and the bottom forming quality during concrete pouring are guaranteed by virtue of the streamline appearance design and the built-in hollow cone; through the reasonable design of the anti-floating and positioning system of the built-in square box, a definite force transmission path and reliable connection are realized by using a simple and feasible device, and the spatial positioning of the built-in square box in the horizontal and vertical directions is effectively ensured; the simple and efficient prestressed tendon positioning device is adopted, and accurate positioning of the prestressed tendon is achieved. The whole solution reduces the on-site construction difficulty and the working strength of operators, can effectively ensure the forming precision and the construction quality of the hollow floor system, and effectively reduces the comprehensive construction cost of the project.
Claims (10)
1. A construction method of a prestressed thick plate hollow floor comprises the following steps:
(1) deepening the geometric dimension and the arrangement parameters of the built-in hollow square box according to the design parameters of the thick plate hollow floor;
(2) calculating the anti-buoyancy force of the built-in hollow square box according to the deepening parameters in the step (1), and determining the arrangement parameters of anti-buoyancy tie bars;
(3) building a floor formwork support and installing a formwork;
(4) carrying out plane positioning and scribing on the positions of the hidden beam, the column cap, the multi-ribbed beam, the high-injection alloy square box and the reserved embedded facilities on the template;
(5) installing hidden beams, column cap reinforcements, plate bottom reinforcements, prestressed reinforcements and reserved embedded facilities;
(6) connecting the plate bottom steel bars with the bottom formwork by using a first connecting piece according to the anti-floating bar parameters determined in the step (2);
(7) laying a positioning device at the bottom of the hollow square box;
(8) laying a hollow square box;
(9) laying an anti-floating reinforcing steel bar layer on the upper parts of the hollow square boxes, and placing an upper positioning device in the middle of the rib beam between the hollow square boxes;
(10) connecting the upper positioning device with the bottom plate steel bars by using a second connecting piece to limit the floating of the hollow square box;
(11) placing a plate top steel bar cushion block, laying and binding plate top steel bars on the plate top steel bar cushion block, and tying the plate top layer steel bars and the plate bottom steel bars through tie bars;
(12) after the acceptance is qualified, pouring concrete, vibrating and maintaining;
(13) after the strength design requirement is met, pre-stressed tensioning, grouting and anchor sealing are carried out;
(14) and (5) removing the template.
2. The construction method of the prestressed thick-plate hollow floor as claimed in claim 1, wherein: the hollow square box is assembled by upper case and below case and is constituteed, the top of upper case and the bottom of below case are equipped with cross recess, the side of upper case and below case is equipped with the isosceles trapezoid recess respectively, the hollow chamber of circular cone that link up about upper case and below case are equipped with along the axis, the bight and the limit portion of upper case and below case are the circular arc transition, the bottom of upper case and the top of below case are equipped with the stiffening rib that stretches out along circumference, even interval is equipped with corresponding complex location male fastener and location female fastener on the strengthening rib of upper case and below case, upper case and below case carry out the lock through location male fastener and location female fastener and assemble.
3. The construction method of the prestressed thick-plate hollow floor as claimed in claim 1, wherein: and (3) when the anti-buoyancy of the hollow square box is analyzed in the step (2), establishing a three-dimensional model for analysis by adopting a finite element analysis method, wherein the determined arrangement parameters of the anti-floating tie bar comprise the arrangement point coordinates of the anti-floating tie bar, the diameter and the material of the anti-floating tie bar.
4. The construction method of the prestressed thick-plate hollow floor as claimed in claim 1, wherein: when the bottom plate reinforcing steel bars are installed, bottom plate reinforcing steel bar cushion blocks are laid at the intersection of the longitudinal and transverse bottom plate reinforcing steel bars, the bottom plate reinforcing steel bar cushion blocks are cylinders and are provided with grooves which are vertically crossed, the inner diameters of the grooves are matched with the diameters of the bottom plate reinforcing steel bars, and the distance between the bottoms of the grooves and the bottoms of the bottom plate reinforcing steel bar cushion blocks is equal to the thickness of the bottom plate reinforcing steel bar protective layers.
5. The construction method of the prestressed thick-plate hollow floor as claimed in claim 1, wherein: when the prestressed tendon is installed, the prestressed tendon positioning device is used for positioning, the prestressed tendon positioning device is made of steel bars, the lower portion of the prestressed tendon positioning device is L-shaped, the top of the prestressed tendon positioning device is spiral, the spiral inner diameter and the distance of the spiral inner diameter are matched with the outer diameter of the prestressed tendon, the prestressed tendon is fixed by winding the spiral at the top of the prestressed tendon positioning device and binding the prestressed tendon, the L-shaped lower portion of the prestressed tendon is fixed with the lacing wire, and the length of the L-shaped prestressed tendon is prefabricated according to the control height of the position of the prestressed tendon.
6. The construction method of the prestressed thick-plate hollow floor as claimed in claim 1, wherein: first connecting piece is the iron wire, the position, diameter and the material that set up of iron wire are calculated by step (2) and are confirmed, the reinforcing bar on bottom of the board reinforcing bar upper strata is walked around to the iron wire, and drilling on the template that corresponds the position below implements ligature and end of the connecting plate reinforcing bar and die block board after perforating with the iron wire.
7. The construction method of the prestressed thick-plate hollow floor as claimed in claim 1, wherein: hollow square chest bottom positioner comprises the spacer that mutually perpendicular set up, the spacer includes flute profile reinforcing bar and support stirrup, the flute profile reinforcing bar is U type and the outer book of upper end level, support stirrup welding in the bottom of flute profile reinforcing bar, the bottom of hollow square chest is located to the spacer cover to with the outer upper and lower panel muscle lacing wire ligature connection of folding end and hollow square chest between the rib roof beam department of flute profile reinforcing bar, with stirrup and board bottom reinforcement ligature connection.
8. The construction method of the prestressed thick-plate hollow floor as claimed in claim 1, wherein: the upper portion positioner is the recess phase-match of a few font reinforcing bars and width and hollow square chest side, upper portion positioner's top is equipped with the crotch, upper portion positioner stretches into the recess of hollow square chest side and utilizes the crotch to hang and establish on anti floating reinforcement.
9. The construction method of the prestressed thick-plate hollow floor as claimed in claim 8, wherein: the second connecting piece is the iron wire, the one end of second connecting piece is fixed the bight, the other end of several font reinforcing bars are fixed on the lower floor's of corresponding lower part board bottom reinforcing bar, open at the stiffening rib middle part of hollow square chest circumference has the notch, the second connecting piece passes from the notch.
10. The construction method of the prestressed thick-plate hollow floor as claimed in claim 1, wherein: the plate top steel bar cushion block is a cylinder and is provided with vertically crossed grooves, the inner diameter of each groove is matched with the diameter of the plate top layer steel bar, and the distance between the bottom of each groove and the bottom of the plate top steel bar cushion block is equal to the distance between the plate top layer steel bar and the hollow square box.
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| CN111959854A (en) * | 2020-08-04 | 2020-11-20 | 王南南 | Reinforcing bar pad bundling device for building |
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| CN112069560A (en) * | 2020-08-03 | 2020-12-11 | 广联达科技股份有限公司 | Modeling system for hollow floor |
| CN112177221A (en) * | 2020-09-29 | 2021-01-05 | 吴永兴 | Non-dismantling formwork system utilizing quick and easy metal mesh and construction method thereof |
| CN113175144A (en) * | 2021-04-06 | 2021-07-27 | 湖北省工业建筑集团有限公司 | Construction method of GBF high-strength alloy thin-wall square-box hollow floor |
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| CN111980258A (en) * | 2020-06-30 | 2020-11-24 | 中国一冶集团有限公司 | Method for installing reinforced expansion net cage |
| CN111980258B (en) * | 2020-06-30 | 2022-03-22 | 中国一冶集团有限公司 | Method for installing reinforced expansion net cage |
| CN112069560A (en) * | 2020-08-03 | 2020-12-11 | 广联达科技股份有限公司 | Modeling system for hollow floor |
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| CN112177221A (en) * | 2020-09-29 | 2021-01-05 | 吴永兴 | Non-dismantling formwork system utilizing quick and easy metal mesh and construction method thereof |
| CN113175144A (en) * | 2021-04-06 | 2021-07-27 | 湖北省工业建筑集团有限公司 | Construction method of GBF high-strength alloy thin-wall square-box hollow floor |
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