Connecting structure of steel beam and steel bar truss floor support plate and construction method

Abstract

The invention relates to a connecting structure of a steel beam and a steel bar truss floor support plate and a construction method.The connecting structure comprises H-shaped steel, a steel bar truss floor support plate bottom die and a steel bar truss placed on the top of the steel bar truss floor support plate bottom die, and the steel bar truss comprises upper chord steel bars, web members and lower chord steel bars; a plurality of suspension reinforcing steel bars are welded to the bottom face of an upper flange of the H-shaped steel at intervals and are perpendicular to the upper flange, the suspension reinforcing steel bars located on the same side are fixedly connected through through long connecting reinforcing steel bars, the length direction of the through long connecting reinforcing steel bars is perpendicular to the length direction of the upper chord reinforcing steel bars and the length direction of the lower chord reinforcing steel bars, and the ends of the upper chord reinforcing steel bars are welded to the top of the upper flange of the H-shaped steel. The ends of the lower chord steel bars are welded to the full-length connecting steel bars, and concrete is poured on the two sides of a web of the H-shaped steel and the top of the steel bar truss floor support plate bottom die at the same time. Construction is convenient, connectivity is good, joints are not prone to cracking and water leakage, and the floor does not occupy floor height.

Description

Technical Field

[0001] The present invention relates to the field of prefabricated buildings, and in particular to a connection structure and a construction method for a steel beam and a steel truss floor deck. Background Art

[0002] With the increasing demand for the industrialization of buildings in China, more and more construction projects have adopted prefabricated construction solutions. Among them, in the selection of floor slabs and structural beams, the combination of PEC (Partially-Encasedsed Composite) structural steel beams and steel truss floor slabs has become very common.

[0003] At present, the traditional connection method between the steel truss floor deck and the PEC steel beam is to place the steel truss floor deck directly on the PEC steel beam. The structure after connection makes the steel truss floor deck significantly higher than the PEC steel beam. This connection method occupies too much floor height and affects the net height of the room. In order to improve this problem, some designs in the prior art also adopt the lowering treatment method of the steel truss floor deck, but the current method is more troublesome to produce and process, and the concrete of the PEC structural beam is pre-cast in the factory. When the PEC structural beam is connected to the steel truss floor deck at the construction site, the cast-in-place concrete on the steel truss floor deck and the concrete on the PEC structural beam are cast in batches, the integrity of the floor slab is poor, the construction efficiency is also low, and the connection is prone to leakage. Summary of the invention

[0004] The present invention firstly discloses a connection structure between a steel beam and a steel truss floor deck. The overall height of the formed connection structure does not exceed the upper flange of the structural beam too much, thereby reducing the occupation of the floor height by the floor slab, and the connection between the steel truss floor deck and the structural beam is not prone to cracking and water leakage.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is: A connection structure between a steel beam and a steel truss floor deck, comprising an H-shaped steel, a steel truss floor deck bottom formwork and a steel truss placed on top of the steel truss floor deck bottom formwork, the steel truss comprising an upper chord steel bar, a web bar and a lower chord steel bar, a plurality of suspension steel bars are welded at intervals on the bottom surface of an upper flange of the H-shaped steel, the suspension steel bars are perpendicular to the upper flange, the suspension steel bars on the same side are fixedly connected by arranging through-length connecting steel bars, the length direction of the through-length connecting steel bars is perpendicular to the length direction of the upper and lower chord steel bars, the ends of the upper chord steel bars are welded to the top of the upper flange of the H-shaped steel, the ends of the lower chord steel bars are welded to the through-length connecting steel bars, and concrete is poured simultaneously on both sides of the web of the H-shaped steel and on the top of the steel truss floor deck bottom formwork.

[0006] The present invention also discloses a construction method of the connection structure between the steel beam and the steel bar truss floor deck, which comprises the following steps: Step 1: Multiple suspension steel bars are arranged at intervals at the bottom of the upper flange of the H-shaped steel. The suspension steel bars are perpendicular to the upper flange, and the top ends of the suspension steel bars are welded to the bottom surface of the upper flange; Step 2: Set a full-length connecting steel bar at the bottom of the upper flange of the H-shaped steel, and weld and fix the lower end of the suspension steel bar on the same side to the full-length connecting steel bar; Step 3: Prepare the prefabricated steel truss floor deck bottom formwork, fix the steel truss on the steel truss floor deck bottom formwork, make the upper chord steel bar ends and the lower chord steel bar ends of the steel truss exceed the ends of the steel truss floor deck bottom formwork, and bend the lower chord steel bar ends in the horizontal direction in advance; Step 4: Hoist the bottom formwork of the steel truss floor slab in step 3 together with the steel truss to the H-shaped steel, place the end of the upper chord steel bar on the top of the upper flange of the H-shaped steel, straighten the bend at the end of the lower chord steel bar, and place the straightened end of the lower chord steel bar on the full-length connecting steel bar; Step 5: Weld the ends of the upper chord reinforcement in step 4 to the top of the upper flange, and weld the ends of the lower chord reinforcement to the full-length connecting reinforcement; Step 6: After completing step 5, plastic formwork is set on both sides of the web of the H-shaped steel, the plastic formwork is heated and stretched to deform, and the upper part of the plastic formwork is stretched to fit closely with the bottom surface of the bottom formwork of the steel truss floor deck; Step 7: After completing step 6, pour concrete simultaneously in the cavity between the plastic formwork and both sides of the web of the H-shaped steel, and on the top surface of the bottom formwork of the steel truss floor deck.

[0007] The present invention lengthens the connection ends of the upper chord steel bars and the lower chord steel bars of the steel truss, welds the suspension steel bars on the bottom surface of the upper flange of the H-shaped steel, and connects the adjacent suspension steel bars together by using the full-length connecting steel bars, so that the upper chord steel bars can be laid and welded on the top of the upper flange, and the lower chord steel bars can be laid and welded on the full-length connecting steel bars; in order to prevent the lengthened lower chord steel bars from being blocked by the upper flange of the H-shaped steel when hoisting the bottom formwork of the steel truss floor deck, the ends of the lower chord steel bars are horizontally bent in advance for avoidance, and after the ends of the upper chord steel bars are laid Then straighten the bend of the lower chord steel bar; in order to avoid cracking and water leakage at the connection between the floor slab and the structural beam due to the pouring of concrete in batches, the present invention adopts a plastic formwork set up at the construction site, and the plastic formwork is stretched and deformed by hot air heating, so that the plastic formwork can maintain sealing at the connection with the bottom formwork of the steel truss floor slab, avoiding leakage during concrete pouring. The concrete on both sides of the H-shaped steel web and the top of the bottom formwork of the steel truss floor slab are poured at the same time at the construction site, ensuring the integrity and continuity of the concrete at the connection between the floor slab and the structural beam. The structure designed according to the present invention is used to connect the floor slab and the structural beam, and its construction is simple, the connectivity is good, and the floor slab will not occupy too much floor height. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 Schematic diagram of the connection structure between the structural beam and the steel truss floor deck in the embodiment; Figure 2 It is a plan view of the connection structure between the structural beam and the steel bar truss floor deck in the embodiment; Figure 3 This is a schematic diagram of the construction status of the connection structure between the structural beam and the steel truss floor deck; Figure 4 This is a plan view of the construction status of the connection structure between the structural beam and the reinforced truss floor deck.

[0009] Reference numerals: 1. Bottom formwork of steel truss floor deck; 2. H-shaped steel; 21. Upper flange; 22. Web; 3. Upper chord steel bars; 4. Lower chord steel bars; 5. Suspension steel bars; 6. Full-length connecting steel bars; 7. Concrete; 8. Plastic formwork. DETAILED DESCRIPTION

[0010] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0011] This embodiment discloses a connection structure between a steel beam and a steel bar truss floor deck, and also discloses a construction method of the connection structure, wherein the connection structure is as follows: Figure 1 and Figure 2As shown, it mainly includes H-shaped steel 2, steel truss floor deck bottom form 1 and steel truss pre-fixed on the top of steel truss floor deck bottom form 1. H-shaped steel 2 includes upper flange 21, lower flange and web 22, and steel truss includes upper chord steel bar 3, web bar and lower chord steel bar 4. In order to reduce the occupation of floor height by the floor slab, a plurality of suspension steel bars 5 are arranged at equal intervals along the length direction of the upper flange 21 at the bottom of the upper flange 21 of the H-shaped steel 2 in this embodiment. The suspension steel bars 5 are arranged perpendicular to the upper flange 21, and the top of the suspension steel bars 5 is welded to the bottom surface of the upper flange 21. If both sides of the H-shaped steel 2 need to be connected to the floor slab, a row of suspension steel bars 5 need to be arranged at each end of the bottom of the upper flange 21. The suspension steel bars 5 on the same side are located on the same straight line. A through-length connecting steel bar 6 is arranged at the lower part of the upper flange 21. The length direction of the through-length connecting steel bar 6 is consistent with the length direction of the upper flange 21, and the lower end of each suspension steel bar 5 on the same side is welded to the through-length connecting steel bar 6. The ends of the upper chord steel bars 3 and the lower chord steel bars 4 of the steel truss fixed on the steel truss floor deck bottom formwork 1 are lengthened, and the lengthened ends extend out of the steel truss floor deck bottom formwork 1, and the ends of the upper chord steel bars 3 are welded to the top of the upper flange 21 of the H-shaped steel 2, and the ends of the lower chord steel bars 4 are welded to the full-length connecting steel bars 6. After the above-mentioned assembly connection is completed, formwork is supported on both sides of the web of the H-shaped steel 2, and then concrete 7 is poured simultaneously on both sides of the web of the H-shaped steel 2 and the top of the steel truss floor deck bottom formwork 1.

[0012] Combination Figure 3 and Figure 4 As shown, the construction method of the connection structure between the steel beam and the steel truss floor deck is carried out in the following steps: Step 1: Arrange a plurality of suspension steel bars 5 at equal intervals at the bottom of the upper flange 21 of the H-shaped steel 2, and weld the top ends of the suspension steel bars 5 to the bottom surface of the upper flange 21; Step 2: a through-length connecting steel bar 6 is arranged at the bottom of the upper flange 21 of the H-shaped steel 2, and the lower end of the suspension steel bar 5 located on the same side is welded to the through-length connecting steel bar 6; Step 3: prepare a prefabricated steel truss floor deck bottom form 1, fix the steel truss on the steel truss floor deck bottom form 1, make the ends of the upper chord steel bars 3 and the lower chord steel bars 4 of the steel truss exceed the ends of the steel truss floor deck bottom form 1, and bend the ends of the lower chord steel bars 4 in the horizontal direction in advance; there is no order requirement between step 3 and the above steps 1 and 2; Step 4: hoist the steel truss floor deck bottom formwork 1 in step 3 together with the steel truss to the top of the H-shaped steel 2, first place the end of the upper chord steel bar 3 on the top of the upper flange 21 of the H-shaped steel 2, then straighten the end of the lower chord steel bar 4 at the bent part, and place the straightened end of the lower chord steel bar 4 on the full-length connecting steel bar 6; Step 5: Weld the end of the upper chord steel bar 3 in step 4 to the top of the upper flange 21, and weld the end of the lower chord steel bar 4 to the full-length connecting steel bar 6; Step 6: After completing step 5, plastic formwork 8 is set on both sides of the web of the H-shaped steel 2, and the plastic formwork 8 is used to simultaneously pour concrete 7 on both sides of the web of the H-shaped steel 2 and the top of the bottom formwork 1 of the steel truss floor deck. In the prior art, wooden formwork is usually used for formwork pouring, but since it is difficult to accurately align the wooden formwork with the bottom formwork 1 of the steel truss floor deck, it is easy to have a poor seal, and it is easy to leak when pouring concrete. In order to avoid this problem, in this embodiment, a plastic formwork 8 is used instead, and the plastic formwork 8 is heated by hot air, and the heated plastic formwork 8 is stretched to deform it, so that the plastic formwork 8 can fit closely with the bottom surface of the bottom formwork 1 of the steel truss floor deck, ensuring good sealing of the formwork.

[0013] Step 7: After completing step 6, concrete 7 is poured simultaneously in the cavity between the two sides of the web of the H-shaped steel 2 and the plastic formwork 8, and on the top surface of the bottom formwork 1 of the steel truss floor deck.

[0014] In the present invention, the upper chord steel bars 3 are fixed on the top of the upper flange 21, so that the steel truss is basically at the same height as the H-shaped steel 2. Since the concrete on the structural beam is poured simultaneously with the concrete on the bottom formwork 1 of the steel truss floor deck, the poured concrete 7 covers the upper chord steel bars 3, forming a complete and continuous upper surface of the floor slab concrete, which not only meets the fire protection requirements of the upper flange 21 of the structural beam, but also can avoid water leakage at the connection between the floor slab and the structural beam for rooms with water by applying waterproof coating on the upper surface of the concrete 7.

[0015] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A connection structure between a steel beam and a steel truss floor deck, comprising an H-shaped steel, a steel truss floor deck bottom formwork, and a steel truss placed on top of the steel truss floor deck bottom formwork, wherein the steel truss comprises an upper chord steel bar, a web member, and a lower chord steel bar, and is characterized in that: Multiple suspension steel bars are welded at intervals on the bottom surface of the upper flange of the H-shaped steel. The suspension steel bars are perpendicular to the upper flange. The suspension steel bars on the same side are fixedly connected by arranging through-length connecting steel bars. The length direction of the through-length connecting steel bars is perpendicular to the length direction of the upper and lower chord steel bars. The end of the upper chord steel bar is welded to the top of the upper flange of the H-shaped steel, and the end of the lower chord steel bar is welded to the through-length connecting steel bar. Concrete is poured simultaneously on both sides of the web of the H-shaped steel and the top of the bottom formwork of the steel truss floor deck.

2. The construction method of the connection structure between a steel beam and a steel bar truss floor deck as claimed in claim 1, characterized in that: The steps include: Step 1: Multiple suspension steel bars are arranged at intervals at the bottom of the upper flange of the H-shaped steel. The suspension steel bars are perpendicular to the upper flange, and the top ends of the suspension steel bars are welded to the bottom surface of the upper flange; Step 2: Set a full-length connecting steel bar at the bottom of the upper flange of the H-shaped steel, and weld and fix the lower end of the suspension steel bar on the same side to the full-length connecting steel bar; Step 3: Prepare the prefabricated steel truss floor deck bottom formwork, fix the steel truss on the steel truss floor deck bottom formwork, make the upper chord steel bar ends and the lower chord steel bar ends of the steel truss exceed the ends of the steel truss floor deck bottom formwork, and bend the lower chord steel bar ends in the horizontal direction in advance; Step 4: Hoist the bottom formwork of the steel truss floor slab in step 3 together with the steel truss to the H-shaped steel, place the end of the upper chord steel bar on the top of the upper flange of the H-shaped steel, straighten the bend at the end of the lower chord steel bar, and place the straightened end of the lower chord steel bar on the full-length connecting steel bar; Step 5: Weld the ends of the upper chord reinforcement in step 4 to the top of the upper flange, and weld the ends of the lower chord reinforcement to the full-length connecting reinforcement; Step 6: After completing step 5, plastic formwork is set on both sides of the web of the H-shaped steel, the plastic formwork is heated and stretched to deform, and the upper part of the plastic formwork is stretched to fit closely with the bottom surface of the bottom formwork of the steel truss floor deck; Step 7: After completing step 6, pour concrete simultaneously in the cavity between the plastic formwork and both sides of the web of the H-shaped steel, and on the top surface of the bottom formwork of the steel truss floor deck.

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