阅读说明：本技术 板端开槽孔sp空心叠合板-钢梁连接结构及其施工方法 (Plate end slotted hole SP hollow composite slab-steel beam connecting structure and construction method thereof ) 是由 陈娟 谢科 吴浩 胡顺杰 张仁杰 于 2021-06-15 设计创作，主要内容包括：本发明提供了一种板端开槽孔SP空心叠合板-钢梁连接及其施工方法,由板端芯孔开槽、板顶开孔的SP预应力空心板、钢筋网架、剪力连接件和后浇混凝土层构成,本发明在预制SP预应力空心板板端开长槽、板顶开孔,槽内放置钢筋网架,钢梁上焊接剪力连接件,浇筑混凝土后浇层时填实板端长槽和芯孔。本发明在板端芯孔处填实混凝土可以增加板肋的有效宽度,提高板端抗剪承载力,补强了板的薄弱部位,钢筋网架可保证楼板纵向的连续性和整体性,在竖向荷载下可以承受部分负弯矩,减小组合楼盖的跨中挠度、提高竖向承载力,并可作为组合梁的纵向抗剪钢筋、充当板端剪力筋以增强板端抗剪承载力,具有广阔的应用前景。(The invention provides a plate end slotted hole SP hollow composite slab-steel beam connection and a construction method thereof, which comprises a plate end core hole slotted, a SP prestressed hollow slab with a hole on the top of the slab, a reinforcing steel bar net rack, a shear connector and a post-cast concrete layer. The invention can increase the effective width of the plate rib, improve the shearing bearing capacity of the plate end, reinforce the weak part of the plate, and the reinforcing steel bar net rack can ensure the longitudinal continuity and integrity of the floor slab, can bear partial negative bending moment under the vertical load, reduce the mid-span deflection of the composite floor system, improve the vertical bearing capacity, and can be used as the longitudinal shearing steel bar of the composite beam and the plate end shearing rib to enhance the shearing bearing capacity of the plate end, thereby having wide application prospect.)

1. The utility model provides a hollow superimposed sheet-girder steel connection structure of board end fluting hole SP which characterized in that: the steel beam is welded with a plurality of prefabricated SP prestressed hollow slabs and connected by shear connectors, and the hollow slabs and the steel beams are integrated through a concrete superposed layer poured above and behind; the SP prestressed hollow slab is longitudinally provided with a plurality of core holes at the slab top close to the slab end, the top surface of the slab is grooved at intervals by a plurality of core holes, and the core hole positions are aligned with the grooving lengths and have the same core hole and grooving diameter; a longitudinal steel bar net rack is erected in the slot, the end part of the slot is provided with a plugging structure for plugging the slot hole, and the same plugging structures are arranged at the same positions of the other core holes; concrete is secondarily poured in the SP prestressed hollow slab grooving, the opening and the slab top surface on the construction site, wherein a reinforcing mesh is laid in the post-cast concrete layer on the slab top.

2. The plate-end slotted hole SP hollow composite slab-steel beam connection structure as claimed in claim 1, wherein: the longitudinal reinforcing steel bar net rack consists of two rows of longitudinal stressed main bars and equidistant vertical shearing reinforcing steel bars, the shearing reinforcing steel bars serve as constructional frame vertical bars, the maximum height of the reinforcing steel bar net rack is not more than the groove height, and the length is the sum of the slotting lengths of the two SP prestressed hollow slabs, the width of the steel beam and the lap joint length of the SP prestressed hollow slabs on the steel beam.

3. The plate-end slotted hole SP hollow composite slab-steel beam connection structure as claimed in claim 1, wherein: the upper part of the steel beam is welded with bent-up constructional steel bars, and the bent-up constructional steel bars surround the shear connector.

4. The plate-end slotted hole SP hollow composite slab-steel beam connection structure as claimed in claim 1, wherein: when the longitudinal reinforcing steel bar net rack is connected with the girder at the boundary beam through the girder-slab, the longitudinal reinforcing steel bar net rack is connected with the girder through spot welding.

5. The plate-end slotted hole SP hollow composite slab-steel beam connection structure as claimed in claim 1, wherein: the top surface of the plate is a concave-convex rough surface.

6. A construction method for connection of plate end slotted holes SP hollow composite slabs and steel beams is characterized by comprising the following steps:

1) prefabricating an SP prestressed hollow slab, grooving and perforating, and processing a rough surface on the slab surface;

2) the core hole is sealed at the tail ends of the opening part and the slotting part,

3) hoisting the processed prefabricated SP prestressed hollow slab on site, and erecting the prefabricated SP prestressed hollow slab at the upper flange of a steel beam welded with a shear connector;

4) manufacturing longitudinal steel bar net racks in batches, erecting the longitudinal steel bar net racks in the grooves of the precast SP prestressed hollow slabs according to the positions of the grooves at the slab ends, wherein when the slab ends are connected in a beam-slab mode at a middle beam, the steel bar net racks are connected with concrete slabs on the other side across the steel beams, and when the slab ends are connected in a beam-slab mode at an edge beam, the steel bar net racks are connected with the steel beams through spot welding in the field;

5) laying a superposed layer steel bar mesh, welding bent-up structural steel bars at the upper part of the steel beam, and semi-surrounding the shear connector by the bent-up structural steel bars;

6) and pouring and filling concrete at the core hole of the slab end, wherein the post-poured concrete flows into the core hole through the slab top hole and the slab end groove, and the concrete at the core hole is compacted to form the combined floor beam-slab connection structure.

7. The construction method for plate end slotted hole SP hollow composite slab-steel beam connection according to claim 6, wherein: in the filling process of the step 2), the rubber tube extends into the slot or the open hole, and the filler is filled in the rubber tube, wherein the filler comprises a polyurethane foaming agent.

Technical Field

The invention relates to the field of building structures, in particular to a plate end slotted hole SP hollow composite slab-steel beam connecting structure and a construction method thereof.

Background

The steel-concrete composite floor system is a composite structure formed by combining steel beams and concrete floor boards, the combination effect of the steel beams and the concrete floor boards can obviously improve the strength and the rigidity of the floor system and improve the spanning capability of the floor system, and simultaneously, the steel consumption can be saved and the structure height can be reduced.

The composite slab floor is used as a structural form in a steel-concrete composite floor, and a formwork is not required in the construction process, so that the precast concrete slab is directly hoisted on site after being processed in a factory, the construction efficiency is greatly improved, and the labor force is saved; the prefabricated plate part adopts an industrial production mode, and the design strength and the quality of the floor slab are ensured; the existence of the laminated layer increases the integral rigidity in the floor plane and greatly improves the anti-seismic performance of the composite floor. The method is widely applied to large-span house structures, industrial plants and high-rise buildings in recent years, and obtains very good economic and social benefits.

The SP prestressed hollow slab is a precast concrete slab introduced from the United states, along with the improvement of the industrial productivity level of China, the production efficiency of the SP slab is improved year by year, the production process is mature day by day, the product quality is good, the SP slab becomes an economic and efficient precast slab and is gradually put into a floor slab and a roof slab system, and the SP prestressed hollow slab has the characteristics of light weight, large span and high strength and is very suitable for being applied to large-span fabricated steel-concrete composite floor systems.

The design of the joint part of the precast concrete slab and the steel beam in the assembled steel-concrete composite floor system is particularly important, whether the beam-slab joint is designed reasonably or not directly influences the integral force transmission of the floor system, and the assembled steel-concrete composite floor system is one of the weakest parts of the assembled composite floor system. According to the design scheme in the SP prestressed hollow composite slab combined floor beam-slab connection, a belt buckle anchoring steel plate embedded part is arranged at the slab end, the embedded part is anchored with a prestressed steel strand and is welded with a lower steel beam, the combination of the steel beam and a concrete slab is realized, and the integrity and the horizontal rigidity of the combined floor system are ensured by pouring a concrete laminated layer. However, the traditional connection form does not fully play the combined action of the steel beam and the concrete, the structural force transmission is unreasonable, the brittle failure of the joint of the plate ends is easy to occur only by means of welding connection, the SP plate does not have shear steel bars due to the structural characteristics, the plate ends are often subjected to shear failure under vertical load, the structural integrity and the seismic performance are poor, and the SP plate is often only suitable for low-rise buildings with low requirements on stress performance and seismic performance.

With the rapid economic growth and social progress of China, the current assembly type buildings develop towards high-rise, heavy-load and large-span, the traditional plate end beam-plate connection cannot meet the current requirements, and therefore a new type of SP prestressed hollow composite slab combined floor beam-plate connection needs to be explored.

Disclosure of Invention

The invention aims to solve the problems of the prior art and provides a plate end slotted hole SP hollow composite slab-steel beam connecting structure and a construction method thereof, wherein the plate end slotted hole SP hollow composite slab-steel beam connecting structure has reasonable stress, good anti-seismic performance, convenient construction and high economic benefit.

The invention provides a plate end grooving hole SP hollow composite slab-steel beam connecting structure, which comprises a plurality of prefabricated SP prestressed hollow slabs and steel beams welded with shear connectors for connection, wherein the hollow slabs and the steel beams form a whole through a concrete laminated layer poured above and behind; the SP prestressed hollow slab is provided with a plurality of core holes at the top of the slab close to the slab end, the top surface of the slab is grooved at intervals by a plurality of core holes, and the core hole positions are aligned with the grooving lengths and have the same core hole and grooving diameter; a longitudinal steel bar net rack is erected in the slot, the end part of the slot is provided with a plugging structure for plugging the slot hole, and the same plugging structures are arranged at the same positions of the other core holes; concrete layers are poured in the grooves, the holes and the surface of the plate top of the SP prestressed hollow plate, wherein a reinforcing mesh is laid in the post-pouring concrete layer on the plate top.

The longitudinal steel bar net rack is further improved, the longitudinal steel bar net rack is composed of two rows of longitudinal stress main bars and equidistant vertical shear steel bars, the shear steel bars serve as construction vertical bars, the maximum height of the steel bar net rack is not more than the groove height, and the length is the sum of the slotting lengths of the two SP prestressed hollow slabs, the width of the steel beam and the lap joint length of the SP prestressed hollow slabs on the steel beam.

Further improved, the upper part of the steel beam is welded with bent-up constructional steel bars, and the bent-up constructional steel bars are semi-surrounded by the shear connecting piece.

The longitudinal reinforcing steel bar net rack is connected with the SP prestressed hollow slab on the other side across the steel beam when the longitudinal reinforcing steel bar net rack is connected with the beam and the slab at the middle beam, and is connected with the steel beam through spot welding when the longitudinal reinforcing steel bar net rack is connected with the beam and the slab at the boundary beam.

Further improved, the top surface of the plate is a rough surface.

The invention also provides a construction method of the plate end slotted hole SP hollow composite slab-steel beam connecting structure, which comprises the following steps:

1) prefabricating an SP prestressed hollow slab, grooving and perforating, and processing a rough surface on the slab surface;

2) and plugging the core hole at the open hole and the tail end of the open groove, wherein the rubber tube is stretched into the open groove or the open hole in the filling process, and the filler is filled in the rubber tube, wherein the filler comprises a polyurethane foaming agent.

3) Hoisting the processed prefabricated SP prestressed hollow slab on site, and erecting the prefabricated SP prestressed hollow slab at the upper flange of a steel beam welded with a shear connector;

4) manufacturing longitudinal steel bar net racks in batches, erecting the longitudinal steel bar net racks in the grooves of the precast SP prestressed hollow slabs according to the positions of the grooves at the slab ends, wherein when the slab ends are connected in a beam-slab mode at a middle beam, the steel bar net racks are connected with concrete slabs on the other side across the steel beams, and when the slab ends are connected in a beam-slab mode at an edge beam, the steel bar net racks are connected with the steel beams through spot welding in the field;

5) laying a superposed layer steel bar mesh, welding bent-up structural steel bars at the upper part of the steel beam, and semi-surrounding the shear connector by the bent-up structural steel bars;

6) and pouring and filling concrete at the core hole of the slab end, wherein the post-poured concrete flows into the core hole through the slab top hole and the slab end groove, and the concrete at the core hole is compacted to form the combined floor beam-slab connection structure.

The invention has the beneficial effects that:

1. due to the fact that no shear steel bar is arranged in the SP plate, plate end shearing damage is prone to occurring under vertical force, concrete is filled in a core hole of the plate end, effective width of a plate end plate rib can be increased, plate end shearing bearing capacity is remarkably improved, and a weak stress part of the plate is reinforced.

2. The reinforcing steel bar net rack additionally arranged at the plate end can ensure the longitudinal continuity and integrity of the floor slab, can bear partial negative bending moment under vertical load, can resist the lifting of the laminated slab caused by integral longitudinal bending, reduces the mid-span deflection of the composite floor and improves the vertical bearing capacity; the free sliding of the interface between the laminated slab and the steel beam can be limited under the horizontal earthquake force, and the combination effect of the steel and the concrete is greatly exerted.

3. The steel bar net rack can be used as a transverse stressed steel bar of the composite beam and as a plate end shear bar to enhance the shear-resisting bearing capacity of the plate end.

4. The reinforcing steel bar net rack can also replace shearing-resistant beard ribs at the end of the traditional prefabricated laminated slab composite floor, so that the problem that stud shear connectors often conflict with the beard ribs in the construction process is avoided, the construction difficulty is greatly reduced, and the construction efficiency is improved.

5. The plate top is perforated, so that concrete can flow into and fill the plate end core hole better, and the plate end core hole can be plugged conveniently.

6. The length of the compact core hole can be changed by adjusting the length of the slot and the position of the hole so as to adapt to the design requirements of the plate ends of different span plates.

7. The slotted hole formed at the plate end can facilitate the erection and positioning of the reinforcing steel bar net rack.

Drawings

Fig. 1 is a schematic view of a beam-plate connection of a composite floor slab of a middle beam slab-end grooved hole SP prestressed hollow composite slab.

Fig. 2 is a schematic view of the beam-plate connection of the floor slab combination of the SP prestressed hollow composite slab with the grooved holes at the plate ends at the edge beams.

Figure 3 is a longitudinal cross-sectional view of the combination floor beam-slab joint at the slab end grooving.

Figure 4 is a longitudinal cross-sectional view of the combination floor beam-slab connection at the opening in the slab top.

Fig. 5 is a transverse cross-sectional view of a plate end of a pre-stressed hollow composite slab with slotted holes SP in the plate end.

Marked as 1. SP prestressed hollow slab; 2. a plate end groove; 3. a plate top hole; 4. a longitudinal steel bar net rack; 5. a steel beam; 6. a shear connector; 7. a blocking structure; 8. post-pouring a concrete layer; 9. compacting the core hole section; 10. overlapping a layer of reinforcing mesh; 11. and bending the construction steel bar.

Detailed Description

The invention will be further explained with reference to the drawings.

The invention provides a slab end slotted hole SP prestressed hollow composite slab combined floor beam-slab connecting structure which mainly comprises an SP prestressed hollow slab 1, a longitudinal reinforcing steel bar net rack 4, a steel beam 5, a shear connector 6 and a post-cast concrete layer 8, and is shown in figures 1, 2, 3 and 4.

A plate end groove 2 is formed in a core hole at the plate end 1/4 of the SP prestressed hollow plate 1, plate top holes 3 are formed in the rest core holes, and the hole forming position is aligned with the length of the groove, as shown in figures 1, 2 and 5.

And erecting a longitudinal steel bar net rack 4 at the groove 2 at the plate end, and fixing the longitudinal steel bar net rack with a steel beam 5 in a spot welding mode when the longitudinal steel bar net rack is in beam-plate connection at the boundary beam, as shown in figures 1, 2, 3 and 4.

The post-cast concrete flows into and forms a plate end dense core hole section 9 through the plate end grooves 2 and the plate top holes 3, and is connected with the shear connectors 6 to form an integral floor, as shown in fig. 3, 4 and 5.

According to the stress requirement, a certain laminated steel bar net 10 is arranged in the post-cast concrete layer 8, and the bent construction steel bars 11 are arranged at the upper part of the composite beam, as shown in figures 3, 4 and 5.

The construction process of the invention comprises the following steps:

1) prefabricating an SP prestressed hollow slab, grooving and perforating, and processing a rough surface on the slab surface;

2) and (3) plugging the core hole by a plugging structure 7 at the tail ends of the open hole and the open groove, wherein the rubber tube is stretched into the open groove or the open hole in the filling process, and the filler is filled in the rubber tube and comprises a polyurethane foaming agent.

3) Hoisting the processed prefabricated SP prestressed hollow slab on site, and erecting the prefabricated SP prestressed hollow slab at the upper flange of a steel beam welded with a shear connector;

4) manufacturing longitudinal steel bar net racks in batches, erecting the longitudinal steel bar net racks in the grooves of the precast SP prestressed hollow slabs according to the positions of the grooves at the slab ends, wherein when the slab ends are connected in a beam-slab mode at a middle beam, the steel bar net racks are connected with concrete slabs on the other side across the steel beams, and when the slab ends are connected in a beam-slab mode at an edge beam, the steel bar net racks are connected with the steel beams through spot welding in the field;

5) laying a superposed layer steel bar mesh, welding bent-up structural steel bars at the upper part of the steel beam, and semi-surrounding the shear connector by the bent-up structural steel bars;

6) and pouring and filling concrete at the core hole of the slab end, wherein the post-poured concrete flows into the core hole through the slab top hole and the slab end groove, and the concrete at the core hole is compacted to form the combined floor beam-slab connection structure.

While the invention has been described in terms of its preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.