CN116641504A - Assembled monolithic large-span rib-type combined hollow slab floor and its manufacturing method - Google Patents

Abstract

The invention provides an assembled integral large-span rib plate type combined hollow plate frame floor system and a manufacturing method thereof. The combined hollow plate frame floor system has good space stress performance, effectively reduces the consumption of steel and concrete, and increases the hollow space; the prefabricated components are manufactured in a full-assembly mode, so that consumption of templates and supports is reduced, and parts are convenient and simple to transport and hoist.

Description

Assembled monolithic large-span rib-type combined hollow slab floor and its manufacturing method

technical field

The invention relates to an assembled integral large-span rib plate-type combined hollow plate frame floor and a manufacturing method thereof, belonging to the technical field of green building energy-saving structures.

Background technique

Since 2004, for the first time in the selection of the 19.5m long-span floor structure of a new multi-functional building, the hollow plate frame was used to replace the traditional reinforced concrete well-shaped beam floor structure. Compared with the traditional floor structure system, it has the advantages of high rigidity of the floor structure, strong spanning ability, small structure height, light weight, the fasting part can wear equipment pipelines, save floor height, beautiful grid and no decoration ceiling, etc. The fasting plate frame The composition of the structure belongs to the space structure system, and good economic and social benefits have been achieved through engineering applications.

The prior art discloses the 19.5m-span hollow slab floor structure of a new multi-functional building (Huang Yong. Design and construction of large-span steel-concrete composite hollow slabs. Building Structure. Volume 35, No. 10, 2005, P23 ~24), the height of the entire floor structure is 1200mm, the height-span ratio is about 1/16, and the lower rib is H-shaped steel with a height of 400mm, in which the square steel pipe shear key and H-shaped steel are welded by steel plates, and the lower rib of the H-shaped steel The shear key of the square steel pipe is connected by field welding and high-strength bolts. Due to the requirement of guard beams around, a 1040mm high box-shaped steel beam is set on two supporting corbels in the long span direction of the indoor column top, and a double channel steel shear key is set on it. The on-site construction process is: steel plate blanking, steel pipe shear force, H-shaped steel lower rib processing; 19.5m short steel structure assembled on site, and hoisted to the design elevation to connect with the box edge beam; after completing 3 short steel structures After the hoisting and connection of the structure, the construction of the steel structure along the long direction began to be assembled in the air at the same time; after the construction of the entire steel structure, the concrete column cap and the formwork of the concrete slab were made; the steel bars were bound and the concrete was poured.

The prior art also discloses the 33m-span fasting plate frame floor structure of Guiyang No. 1 Middle School Gymnasium (Huang Yong. 33m-span combined fasting floor design and testing. Journal of Building Structures. Volume 27, No. 2, 2006, P88-93) , the height of the entire floor structure is 1600mm, and the height-span ratio is about 1/21. The short span and long span height of the H-shaped steel lower rib are 700mm and 500mm respectively, and the effective empty space is only 760mm high. Corbels and pre-embedded steel plates are set at the positions corresponding to the side beams of the solid web reinforcement around the perimeter and the grid lines, and H-shaped steel transverse connection beams parallel to the side beams are set up. The structure of the side joints is complicated.

For the hollow plate frame structure floor, under the load, the force of the lower rib of the H-shaped steel is in the state of tension-bending force, the upper concrete slab is in the state of compression-bending force, and the shear key mainly bears the shear force and bending moment. Due to its small structural height, good integrity and the characteristics of space force, the composite hollow plate frame floor can be widely applied to the floor structure with large span and heavy load.

The engineering practice of the above empty web frame has achieved good results. Combined with the vigorous development of the assembly industrialization process in my country in the past, it requires low carbon, energy saving and environmental protection, and promotes the construction of ecological civilization. However, there is still a need for improvement in the above-mentioned traditional hollow grid. For example, the section height of the lower rib of the H-shaped steel is too large; the empty stomach rate is small, which affects the pipeline crossing; the welding workload of a large number of steel plates on site is heavy, and the quality is difficult to control due to the influence of welding deformation; the hoisting of the entire lower rib and shear key in the span direction If the weight is too large, installation and safety are at risk; on-site full frame supports shear keys, lower rib steel beams and floor slabs, consumes a lot of formwork, and the support system is complicated; the construction of side beam structure nodes is complicated, and the quality is difficult to guarantee. There are too many components; the shape of the corbel structure of the indoor column top and side beam affects the indoor appearance; the amount of steel is large; the assembly rate is low; the construction period is long.

Therefore, there are still deficiencies in the existing hollow plate frame structure system technology.

Contents of the invention

Aiming at the existing deficiencies, the present invention proposes an assembled integral large-span rib-type combined vierendeel frame floor and its manufacturing method. The amount of concrete and concrete increases the empty space; due to the full assembly of prefabricated components, the consumption of formwork and brackets is reduced, the transportation and lifting of components is convenient and simple, the construction period can be shortened by 40%, and the on-site construction and assembly of various components is simple and efficient , can effectively guarantee the engineering accuracy and quality.

The technical solution of the present invention: an assembled integral large-span rib-type combined vierendeel frame floor, the combined vierendeel plate frame floor is assembled from several grid units, and the plurality of grid units comprise For the square steel pipe shear keys arranged, a combined lower rib is fixedly connected between adjacent square steel pipe shear keys, and a shear positioning key is fixedly connected to the top of each square steel pipe shear key. The top of the key is paved with a prefabricated ribbed plate, on which an installation hole is reserved for each shear key, and a post-cast concrete surface layer is poured on the top of the prefabricated ribbed plate.

Further, the combined lower rib includes a U-shaped steel plate and a cross steel plate welded and fixed at the bottom of the square steel pipe shear key, a group of stressed steel bars for the lower rib are arranged in the U-shaped steel plate, and are bound in the length direction of the stressed steel bars for the lower rib A set of lower rib stirrups is fixed, and concrete is poured in the U-shaped steel plate; the four extension ends of the cross steel plate all extend out from the bottom of the square steel pipe shear key, and the two sides of each extension end are connected with the square steel pipe shear force. Outer steel plates are welded between the keys, and the extension ends and the outer steel plates on both sides form a U-shaped seat, and the ends of the U-shaped steel plates are set in the U-shaped seat and fixedly connected by high-strength bolts.

Furthermore, the lower end of the square steel pipe shear key is welded with a set of weldable sleeves located in the U-shaped seat, and the end of the stressed steel bar of the lower rib is inserted into the weldable sleeve and fixed by welding. Post-cast concrete is poured between the end of the weldable sleeve and the weldable sleeve.

Further, the prefabricated ribbed plate is assembled from several single prefabricated plates, and the single prefabricated plate includes a supporting plate and reinforcing ribs arranged around the bottom of the supporting plate, and support plates and reinforcing ribs are respectively evenly distributed with supporting plates. The stress reinforcement of the slab and the stress reinforcement of the rib are evenly distributed along the length direction of the stress reinforcement of the rib, and the stress reinforcement of the rib between the adjacent prefabricated panels is fixedly connected by double sleeves , so that installation holes are formed at the joints of the reinforcement ribs in the center of the four adjacent single prefabricated panels.

Furthermore, the upper end of the rib stirrup is exposed from the upper surface of the single prefabricated panel.

Further, the top of the square steel pipe shear key is welded and fixed with a steel plate tray, and a shear positioning key is fixedly connected with a high-strength bolt on the steel plate tray, and the reinforcing rib on the prefabricated ribbed plate is placed on the steel plate tray, and at the same time The connection between the reinforcing rib and the steel plate tray is fixed by long bolts. A steel plate tray stiffener is welded between the steel plate tray and the square steel pipe shear key, and a shear key inner stiffener is welded inside the square steel pipe shear key.

Furthermore, pegs are evenly distributed on the inner bottom of the U-shaped steel plate, the upper surface of the steel plate tray, and the outer surface around the shear positioning key.

At the same time, the present invention also provides a manufacturing method based on the above-mentioned assembled integral large-span rib-type composite hollow plate frame, which includes the following steps:

S1. First complete the construction of the frame columns and side beams according to the building plan construction drawing, and then divide the grid units within the range of the side beams by placing them orthogonally or obliquely, and determine the location of the shear key of each square steel pipe layout point;

S2. Hoist the square steel pipe shear key according to the positioning and arrangement points, and then fix and connect all adjacent square steel pipe shear keys through the combined lower rib to form the lower chord frame structure of the combined vierendeel slab floor;

S3. Assemble all the single prefabricated panels on the top of the square steel pipe shear key. When assembling, make installation holes at the joints of the reinforcement ribs in the center of the four adjacent single prefabricated panels, and make each square steel pipe shear The shear positioning key on the top of the force key is inserted into the installation hole for positioning, so that a single prefabricated plate is assembled on the top of the square steel pipe shear key to form an integral prefabricated ribbed plate;

S4. Use the prefabricated ribbed slab as a formwork, and pour a post-cast concrete surface on it, so that the prefabricated ribbed slab and the post-cast concrete surface are combined to form the upper chord floor structure of the combined hollow slab floor.

In the above method, after all the grid units are spliced with each other, the combined lower ribs around the frame structure of the lower chord and the single prefabricated panels around the floor structure of the upper chord are anchored and connected to the frame columns or side beams.

Owing to adopting above-mentioned technical scheme, the advantage of the present invention is:

(1) The present invention is suitable for large-span (18m-36m) assembled floor structures. The combined lower ribs, square steel pipe shear keys, and prefabricated ribbed plates can all be prefabricated in the factory, which greatly reduces the cost of on-site formwork. And the consumption of brackets, the transportation and hoisting of each component is convenient and simple, the construction period of the project can be shortened by 40%, the on-site construction and assembly of various components is simple and efficient, which can effectively improve the accuracy and quality of the project, and can effectively save the cost.

(2) The adoption of the prefabricated construction in the present invention conforms to my country's spirit of vigorously promoting the industrialization of prefabricated buildings, and complies with my country's double-carbon green construction policy.

(3) The present invention has the advantages of high rigidity, strong spanning ability, small structural height and light weight.

(4) The lower rib of the present invention is a combined lower rib, and the section adopts a wide flat beam. The force of the lower rib is mainly accounted for by U-shaped steel plates accounting for 68%, and the force of the steel bar is 32%. The combined lower rib can effectively solve the problem. The problem of anti-cracking of concrete ribs can effectively improve the fasting rate, and the fasting part is more convenient and efficient to pass through electromechanical pipelines, saving the floor height, and at the same time can increase the aesthetics of the grid-free ceiling.

(5) The steel bars spliced between the combined lower rib and each square steel pipe shear key of the present invention are connected by double sleeves, and the steel plates are connected by high-strength bolts. The welding of steel components and the hoisting of heavy steel beams.

(6) The square steel pipe shear key of the present invention is provided with a shear key internal stiffening plate that is flush with the reinforcing rib up and down, which can effectively improve the shear resistance and exert the rigidity of the component.

(7) The prefabricated ribbed plate of the present invention is more rigid than the traditional laminated plate, which can effectively ensure the mechanical properties of the plate during transportation and hoisting. It is placed on the left and right sides of the square steel pipe shear key to form a double-rib grid plate. It has better mechanical performance than the traditional beamless floor.

(8) The stressed steel bars between the reinforcing ribs at the bottom of the single prefabricated slab of the present invention are connected by double sleeves. On the steel plate pallet of the steel pipe shear key, a large number of templates and supporting brackets for the upper plate are saved.

(9) The combined lower ribs, square steel pipe shear keys and prefabricated ribbed plates of the present invention are all small components, and the material stacking and vehicle transportation are simple and efficient, and the components are light in weight, and there is no need for large-tonnage tower cranes or cranes on site.

(10) The present invention can realize on-site assembly, effectively improve the assembly rate, on-site hoisting and splicing and other structural constructions do not interfere with each other, can perfectly realize process interleaving, meet the requirements of green construction and lean construction, and effectively save construction time.

To sum up, compared with the traditional hollow plate frame, the combined hollow plate frame floor of the present invention has small self-weight, large empty stomach rate, small lower rib cross-section, small storey height, high structural rigidity, excellent economic performance, and can realize more Large span and other advantages, but also solve the large number of welding processes on the site of the traditional hollow plate frame, the construction of the whole lower rib beam in the short span direction is heavy, the node structure is complex, the structure of the grid unit and the solid web frame edge beam is complicated, and the grid force transmission Unreasonable, slow construction speed, high consumption of formwork and brackets, large thickness of the upper layer and easy cracking and other problems. The invention effectively realizes assembled construction, and has the advantages of energy saving, material saving, low carbon, environmental protection, small components, beautiful grid without ceiling, fast construction speed, high construction quality, clear force transmission of grid, good economic performance, etc. .

Description of drawings

Fig. 1 is a plan layout diagram of the assembled integral large-span rib-type combined vierendeel slab floor in the present invention;

Fig. 2 is a plane layout diagram of the assembled integral large-span rib-type combined vierendeel slab floor of the present invention;

Fig. 3 is a schematic diagram of the grid unit space in the assembled integral large-span rib-type combined hollow plate frame floor of the present invention;

Fig. 4 is the sectional view of the mesh unit in the assembled integral large-span rib-type combined hollow plate frame floor of the present invention;

Fig. 5 is the A-A sectional view of Fig. 4;

Fig. 6 is the B-B sectional view of Fig. 4;

Fig. 7 is a schematic diagram of the assembly of a node of the grid unit in the assembled integral large-span rib-type combined hollow plate frame floor of the present invention;

Figure 8 is an exploded view of Figure 7;

Fig. 9 is a schematic diagram of the assembly of 1/4 prefabricated ribbed slabs in the assembled integral large-span ribbed slab type combined hollow slab frame floor of the present invention;

Fig. 10 is a schematic diagram of the arrangement of steel bars in the U-shaped steel plate in the assembled integral large-span rib-type combined hollow plate frame floor of the present invention;

Fig. 11 is a schematic diagram of the present invention after the completion of the curing of the poured concrete in the U-shaped steel plate in the assembled integral large-span rib-type combined hollow plate frame floor;

Fig. 12 is a schematic diagram of the connection between the combined lower rib and the side beam in the assembled integral large-span rib-type combined vierendeel plate frame floor of the present invention;

Fig. 13 is a C-C sectional view of Fig. 12;

Fig. 14 is a schematic diagram of the space of the steel pipe shear key in the assembled integral large-span rib-type combined hollow plate frame floor of the present invention;

Figure 15 is an exploded view of Figure 14;

Fig. 16 is a schematic diagram of the cutting space of the square steel pipe shear key in the assembled integral large-span rib-type combined hollow plate frame floor of the present invention;

Fig. 17 is a schematic diagram of the space of the monolithic prefabricated slab in the assembled integral large-span rib-type combined hollow slab floor of the present invention;

Fig. 18 is a schematic plan view of a single prefabricated slab in the assembled integral large-span rib-type combined hollow slab floor of the present invention;

Fig. 19 is a sectional view of Fig. 18;

Fig. 20 is a cross-sectional view of the reinforcing ribs in the assembled integral long-span rib-type combined hollow plate frame floor of the present invention.

Explanation of reference signs: 1-combined lower rib, 2-square steel pipe shear key, 3-reinforcing rib, 4-prefabricated ribbed plate, 5-post-cast concrete surface, 6-edge beam, 7-column, 8 -cross steel plate, 9-outer steel plate, 10-shear key inner stiffener, 11-steel plate tray, 12-steel plate tray stiffener, 13-long bolt, 14-shear positioning key, 15-weldable sleeve, 16 -Lower rib stress reinforcement, 17-strengthening rib stress reinforcement, 18-support plate stress reinforcement, 19-additional reinforcement, 20-U-shaped connecting seat, 21-anchor reinforcement, 22-U-shaped steel plate, 23-lower rib Stirrups, 24-bolts, 25-double sleeves, 26-rib stirrups, 27-single prefabricated panels, 28-installation holes.

Detailed ways

In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

Example 1

Referring to Fig. 1, the assembled integral large-span rib-type combined vierendeel plate frame floor of this embodiment is assembled from several grid units placed orthogonally and upright; the several grid units include The square steel pipe shear key 2 is fixedly connected with a combined lower rib 1 between adjacent square steel pipe shear keys 2, and the top of each square steel pipe shear key 2 is fixedly connected with a shear positioning key 14. The top of the steel pipe shear key 2 is paved with a prefabricated ribbed plate 4, and a mounting hole 28 for each shear key 14 is reserved on the prefabricated ribbed plate 4, and the top of the prefabricated ribbed plate 4 is poured There is a post-cast concrete surface5.

Referring to Figures 3 to 9, the combined lower rib 1 includes a U-shaped steel plate 22 and a cross steel plate 8 welded and fixed on the bottom of the square steel pipe shear key 2, and a group of lower rib stressed steel bars 16 are arranged in the U-shaped steel plate 22, A group of lower rib stirrups 23 are tied and fixed in the length direction of the lower rib stressed steel bar 16, and concrete is poured in the U-shaped steel plate 22 at the same time; the four extension ends of the cross steel plate 8 all extend out of the square steel pipe shear key 2 The bottom of each extension end is welded with an outer steel plate 9 between the two sides of each extension end and the square steel pipe shear key 2, and the extension end and the outer steel plates 9 on both sides form a U-shaped seat, and the ends of the U-shaped steel plate 22 are erected In the U-shaped seat and fixedly connected by high-strength bolts.

Referring to Fig. 8, Fig. 11 and Fig. 14, a set of weldable sleeves 15 are welded at the lower end of the square steel pipe shear key 2 and located in the U-shaped seat, and the end of the stressed steel bar 16 of the lower rib is inserted into the weldable sleeve After 15, it is welded and fixed, and between the end of the lower rib stress reinforcement 16 and the weldable sleeve 15, pouring concrete is poured, so that the connection strength between the combined lower rib 1 and the square steel pipe shear key 2 can be further improved.

Referring to Figure 9 and Figures 17-20, the prefabricated ribbed plate 4 is assembled from several single prefabricated plates 27, and the single prefabricated plate 27 includes a supporting plate and reinforcing ribs 3 arranged around the bottom of the supporting plate. The support plate and the reinforcing rib 3 are respectively evenly distributed with the supporting plate stress reinforcement 18 and the reinforcement rib stress reinforcement 17, and the rib stirrup 26 is uniformly distributed along the length direction of the reinforcement rib stress reinforcement 17, and the adjacent monomer The reinforcing rib stress reinforcing bars 17 between the prefabricated panels 27 are fixedly connected by double sleeves 25, thereby forming installation holes 28 at the joints of the reinforcing rib stress reinforcing bars 17 in the center of the four adjacent single prefabricated panels 27, the adjacent The supporting steel bars 18 between the single precast panels 27 are bound and fixedly connected, and the upper ends of the rib stirrups 26 are exposed from the upper surface of the single precast panels 27 .

Referring to Fig. 4 and Fig. 14, the top of the square steel pipe shear key 2 is welded and fixed with a steel plate tray 11, and a shear positioning key 14 is fixedly connected to the steel plate tray 11 by high-strength bolts. The reinforcing rib 3 rests on the steel plate pallet 11, and at the same time, the reinforcing rib 3 and the steel plate pallet 11 are fixedly connected by long bolts 13.

Referring to Figure 8, a steel plate tray stiffener 12 is welded between the steel plate tray 11 and the square steel pipe shear key 2 to improve the support strength of the steel plate tray 11; The stiffening plate 10 inside the force key is used to improve the shear strength of the square steel pipe shear key 2 .

Referring to Fig. 10 and Fig. 15, the inner bottom of the U-shaped steel plate 22, the upper surface of the steel plate tray 11, and the outer surface around the shear positioning key 14 are evenly distributed with pegs 24, and the steel bars are restrained by the pegs 24 to improve the parts The connection strength between them.

The manufacturing method of the above-mentioned assembled integral large-span rib plate type combined hollow plate frame floor includes the following steps:

S1. First complete the construction of the frame column 7 and the side beam 6 according to the construction plan drawing of the building, and then divide the mesh unit within the range of the side beam 6 according to the method of orthogonally placing or orthogonally obliquely placing, and determine the shear force of each square steel pipe Positioning point of key 2;

S2. Hoist the square steel pipe shear keys 2 according to the positioning and arrangement points, and then fix and connect all adjacent square steel pipe shear keys 2 through the combined lower rib 1 to form the lower chord frame structure of the combined hollow slab floor. When connecting the combined lower rib 1 with the square steel pipe shear key 2, first place the end of the U-shaped steel plate 22 on the combined lower rib 1 in the U-shaped seat, and then connect the U-shaped steel plate 22 to the U-shaped seat through high-strength bolts. The type seat is fixedly connected, and at the same time insert the lower rib stress reinforcement 16 of the combined lower rib 1 into the weldable sleeve 15 on the square steel pipe shear key 2, and then weld the weldable sleeve 15 with the lower rib stress reinforcement 16 Fixed, pour concrete after pouring between the end of the lower rib stress reinforcement 16 and the weldable sleeve 15 at last, so just can further improve the connection strength of the combined lower rib 1 and the square steel pipe shear key 2.

S3. Assemble all the single prefabricated panels 27 on the top of the square steel pipe shear key 2. When assembling, the reinforced rib stress bars 17 between the adjacent single prefabricated panels 27 are fixedly connected by double sleeves 25, so that Adjacent to four single prefabricated slabs 27 central reinforcement ribs 17 joints form installation holes 28, and the shear positioning key 14 on the top of each square steel pipe shear key 2 is inserted into the installation hole 28 for positioning, so that The top of the square steel pipe shear key 2 is assembled with a single prefabricated plate 27 to form an integral prefabricated ribbed plate 4, and the reinforcing rib 3 at the bottom of the single prefabricated plate 27 rests on the steel plate tray 11 at the top of the square steel pipe shear key 2. Then use the long bolt 13 to fix the steel plate tray 11 and the reinforcing rib 3, and pour high-grade CGM grouting material in the bolt hole of the long bolt 13;

S4. Using the prefabricated ribbed plate 4 as a template, pouring the post-cast concrete surface 5 on it, so that the exposed rib stirrups 26 at the top of the prefabricated ribbed plate 4 are completely embedded in the post-cast concrete surface 5, so that the prefabricated ribbed plate 4 It is combined with the post-cast concrete surface layer 5 to form the upper chord floor structure of the combined hollow slab floor.

After the above-mentioned grid units are spliced together, the combined lower rib 1 around the frame structure of the lower chord and the single prefabricated panel 27 around the floor structure of the upper chord are anchored and connected to the frame columns 7 or side beams 6 . Referring to Fig. 12 and Fig. 13, when anchoring the lower rib 1 of the combined type, the anchoring steel bar 21 is first anchored on the frame column 7 or the side beam 6, and then the U-shaped connecting seat 20 is welded on the anchoring steel bar 21, at this time, the combined lower rib 1 The end of the rib 1 is set on the U-shaped connecting seat 20, and at the same time, the additional reinforcement 19 is implanted in the frame column 7 or the side beam 6, and the additional reinforcement 19 is fixed to the lower rib stress reinforcement 16 on the combined lower rib 1 Connect, and finally pour concrete after pouring the joint.

When the span of the floor is greater than 33m, weld the shear key inner stiffener 10 in the square steel pipe shear key 2, and at the same time open a round hole on the shear key inner stiffener 10, and then pour concrete into the square steel pipe shear key 2 , and finally form a concrete-containing square steel tube concrete shear key, which is used to improve the shear strength of the square steel tube shear key 2 .

Example 2

Referring to Fig. 2, the assembled integral large-span rib-type combined vierendeel slab floor in this embodiment is assembled from several grid units placed orthogonally and obliquely, and the structure of the grid units is the same as in Embodiment 1. Its difference is: the grid unit near side beam 6 is a right-angled isosceles triangle, and the middle grid unit is a square, then the grid unit side length and side beam 6 grids are divided into 45 ° angle geometric function relationship a=L3( or L4)×sin45°.

Example 3

In order to facilitate the engineering and technical personnel in this industry to understand the technical solution and path of the present invention, the detailed technical path of an example of a virtual sports activity center is as follows:

As shown in Figure 1, the large-span floor structure of a cultural and sports center has a square building with a side length of 32.4m and a building area of 32.4m×32.4m=1049.76㎡. Assembling the integral large-span rib-type combined vierendeel slab floor, the specific implementation steps are as follows: First, the floor is divided into orthogonal and upright grid units, the grid units are squares, and the side lengths are all a=2.7m, then The area of each grid unit is 2.7m×2.7m＝7.29㎡, the whole floor has 144 grid units, and the floor thickness h＝1100mm, which is about 1/29.5 of the floor span Lx(Ly); The cross-section of rib 1 is 400mm×300mm (b×h1), and 180mm of space for installation and secondary pouring is reserved at both ends, so the length of the prefabricated concrete poured inside the combined lower rib 1 is a0=a-b-2e-2c=2700-400 -100-2×180=1840mm; the height of the upper rib of the prefabricated ribbed plate 4 plus the post-cast concrete surface layer 5 is 300mm (h3+δ), the thickness of the prefabricated ribbed plate 4 is 60mm, and the thickness of the post-cast concrete surface layer 5 is 70mm, The total thickness of the floor is 130mm; the square steel pipe shear key 2 section is 500mm×500mm×16mm, then the square steel pipe shear key h0/(b+2e)=500/500=1; the specific construction and installation steps are detailed in Example 1. According to calculations, compared with the traditional empty web frame, the storey height can be saved by 0.43m, the steel consumption can be saved by 65%, the formwork can be saved by 82%, and the construction period can be saved by 40%, and the assembly type can be realized effectively. The size of the grid unit is uniform, the size of each prefabricated component is uniform and standardized, and the factory prefabrication can be made of stainless steel formwork in a unified manner. One formwork can be used multiple times, which truly realizes the core concept of industrial design of the engineering system of "less specifications, more combinations" and the concept of green construction. Technology System.

Claims (9)

1. An assembled integral large-span rib-type combined vierendeel slab floor, which is assembled from a plurality of grid units, and the plurality of grid units include square steel pipes arranged in a matrix The shear key (2) is characterized in that a combined lower rib (1) is fixedly connected between adjacent square steel pipe shear keys (2), and is fixed on the top of each square steel pipe shear key (2). A shear positioning key (14) is connected, a prefabricated ribbed plate (4) is paved on the top of the square steel pipe shear key (2), and a prefabricated ribbed plate (4) is reserved for each shear positioning The mounting hole (28) that key (14) fits is poured with the post-pouring concrete surface course (5) at the top of the prefabricated ribbed plate (4). 2. The assembled integral large-span rib-type combined vierendeel frame floor according to claim 1, characterized in that: the combined lower rib (1) comprises a U-shaped steel plate (22) and is welded and fixed on a square steel pipe The cross steel plate (8) at the bottom of the shear key (2) is arranged with a group of lower rib stressed steel bars (16) in the U-shaped steel plate (22), and a group of lower rib stressed steel bars (16) is bound and fixed in the length direction The lower rib stirrup (23) is poured with concrete in the U-shaped steel plate (22) at the same time; the four extension ends of the cross steel plate (8) all extend out of the bottom of the square steel pipe shear key (2), and each An outer steel plate (9) is welded between the two sides of the extension end and the square steel pipe shear key (2), and the extension end and the outer steel plates (9) on both sides form a U-shaped seat, and the end of the U-shaped steel plate (22) The part is built in the U-shaped seat and fixedly connected by high-strength bolts. 3. The assembly-integrated large-span rib-type combined vierendeel slab floor according to claim 2, characterized in that: the lower end of the square steel pipe shear key (2) is located in the U-shaped seat and is welded with a group of weldable Sleeve (15), the end of described lower rib stressed steel bar (16) is welded and fixed with it after inserting weldable sleeve (15), at the end of lower rib stressed steel bar (16) and weldable sleeve (15) ) is poured with post-cast concrete. 4. The assembled integral large-span rib-type combined vierendeel slab floor according to claim 1, characterized in that: the prefabricated ribbed slab (4) is assembled from a number of single prefabricated slabs (27), The single prefabricated board (27) includes a support board and reinforcement ribs (3) arranged around the bottom of the support board, and the support board and reinforcement ribs (3) are respectively evenly distributed with support board stress reinforcement (18) and reinforcement Rib stress reinforcement (17), rib stirrups (26) are evenly distributed along the length direction of the reinforcement rib reinforcement (17), and the reinforcement rib reinforcement between the adjacent single prefabricated panels (27) (17) is fixedly connected by double sleeves (25), so that installation holes (28) are formed at the joints of the reinforcement ribs (17) in the center of the adjacent four prefabricated single panels (27), and the adjacent single The supporting steel bars (18) between the body prefabricated panels (27) are bound and fixedly connected. 5. The assembled integral large-span rib-type combined vierendeel slab floor according to claim 4, characterized in that: the upper end of the rib stirrup (26) is exposed from the upper surface of the single prefabricated slab (27) . 6. The assembled integral large-span rib-type combined vierendeel frame floor according to claim 1, characterized in that: the top of the square steel pipe shear key (2) is welded and fixed with a steel plate tray (11), and The steel plate tray (11) is fixedly connected with a shear positioning key (14) by high-strength bolts, and the reinforcing rib (3) on the prefabricated ribbed plate (4) rests on the steel plate tray (11), and at the same time (3) is fixedly connected with the steel plate tray (11) by long bolts (13). 7. The assembled integral large-span rib-type combined vierendeel slab floor according to claim 2 or 6, characterized in that: the inner bottom of the U-shaped steel plate (22), the upper surface of the steel plate tray (11) and Studs (24) are evenly distributed on the outer surface around the shear-resistant positioning key (14). 8. A manufacturing method based on the assembled integral large-span rib-type combined hollow plate frame floor according to any one of claims 1 to 7, characterized in that it comprises the following steps: S1. First complete the construction of the frame columns (7) and side beams (6) according to the building plan construction drawing, and then divide the grid units in the range of side beams (6) according to the way of orthogonal upright placement or orthogonal oblique placement, and determine The positioning arrangement point of each square steel pipe shear key (2); S2. Hoist the square steel pipe shear key (2) according to the positioning and arrangement points, and then fix and connect all adjacent square steel pipe shear keys (2) through the combined lower rib (1) to form a combined hollow plate frame floor Lower string frame structure; S3. Assemble all the single prefabricated panels (27) on the top of the square steel pipe shear key (2). When assembling, connect the reinforcement ribs (17) in the center of the four adjacent single prefabricated panels (27) Form the mounting hole (28) at the place, and insert the shear positioning key (14) on the top of each square steel pipe shear key (2) into the mounting hole (28) for positioning, so that the shear key (2) on the top of the square steel pipe shear key (2) An integral prefabricated ribbed plate (4) is formed by assembling a single prefabricated plate (27); S4, using the prefabricated ribbed plate (4) as a template, pouring a post-cast concrete surface (5) on it, so that the prefabricated ribbed plate (4) and the post-cast concrete surface (5) are combined to form a combined empty stomach The upper chord floor structure of the slab floor. 9. The method for manufacturing an assembled integral large-span rib-type combined vierendeel slab floor according to claim 8, characterized in that: after all grid units are spliced together, the combined lower chord frame structure around The ribs (1) and the single prefabricated slabs (27) around the upper chord floor structure are anchored and connected to the frame columns (7) or edge beams (6).