Connecting joint of PEC structural beam and steel bar truss floor support plate and construction method
By setting up steel plates in the connection node between the PEC structural beam and the steel bar truss floor bearing plate and combining the welded structure of the steel bar truss, the problems of high floors and low construction efficiency in the existing technology are solved, and convenient construction, high floor occupancy and water leakage are achieved.
Patent Information
- Application Number
- CN202411768902.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-04
- Publication Date
- 2025-03-28
AI Technical Summary
In the prior art, the connection method between the steel bar truss bearing plate and the PEC structural beam causes the floor slab to be significantly higher than the steel beam, occupy too much floor height, and low construction efficiency and prone to water leakage problems.
The connecting node between the PEC structural beam and the steel truss bearing plate is adopted. Steel plates are set on both sides of the H-shaped steel web of the PEC structural beam, and part of the concrete is precast in the factory, and the spare part is cast after the construction site. The upper and lower chord steel bars of the steel truss are welded on the PEC structural beam. Finally, the upper part of the bottom form of the steel truss bearing plate and the part of the PEC structural beam without precast concrete is cast in place at the same time.
It achieves the effect of convenient construction, small occupancy of floors, and is not prone to cracking and leakage at the connections, improves the assembly efficiency of floor slabs, and ensures the continuous integrity of floor concrete surfaces.
Smart Images
Figure CN119711648A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of prefabricated buildings, and in particular to a connection node between a PEC structural beam and a steel truss floor deck and a construction method. 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 invention discloses a connection node between a PEC structural beam and a steel bar truss floor deck, which has the advantages of convenient construction, less occupied floor height and less prone to cracking and water leakage at the connection.
[0005] In order to achieve the above object, the technical solution adopted by the present invention is: The connection node between the PEC structural beam and the steel truss floor deck comprises the PEC structural beam, the steel truss floor deck bottom formwork, and the steel truss fixed on the top of the steel truss floor deck bottom formwork. The PEC structural beam comprises an H-shaped steel. Steel plates are arranged between the upper and lower flanges on both sides of the web of the H-shaped steel. The steel plates are parallel to the upper and lower flanges, the steel plates are located at one end close to the upper flange, the steel plates are welded to the web, concrete is precast in the factory between the steel plate and the lower flange, and concrete is not precast between the steel plate and the upper flange. The steel truss floor deck bottom formwork is arranged on both sides of the PEC structural beam. The steel truss floor deck bottom formwork is lower than the top surface of the precast concrete. The upper chord steel bars of the steel truss are welded to the top of the upper flange of the H-shaped steel. The lower chord steel bars of the steel truss are welded to the top of the steel plate. Concrete is poured simultaneously on the upper part of the steel truss floor deck bottom formwork and the upper part of the steel plate.
[0006] Furthermore, the thickness of the steel plate is smaller than the thickness of the upper and lower flanges of the H-shaped steel.
[0007] Furthermore, the thickness of the steel plate is 2 mm to 3 mm.
[0008] Furthermore, the thickness of the concrete covering the upper flange of the H-shaped steel shall not be less than 35 mm.
[0009] Furthermore, the distance between the steel plate and the upper flange of the H-shaped steel does not exceed the distance between the upper chord steel bars and the lower chord steel bars in the steel truss.
[0010] Furthermore, steel beam reinforcements are provided on both sides of the web of the PEC structural beam, the bottom of the steel beam reinforcement is fixed on the lower flange, the top of the steel beam reinforcement is fixed on the upper flange, and the edge of the steel plate is spaced to form open reinforcement through-holes, through which the steel beam reinforcements pass.
[0011] The construction method of the connection node between the PEC structural beam and the steel truss floor deck comprises the following steps: Step 1: Steel plates are respectively set on both sides of the web of the H-shaped steel in the factory. The steel plates are parallel to the upper flange and located between the upper and lower flanges close to one end of the upper flange. Concrete is pre-cast between the steel plates and the lower flange on both sides of the web, and no concrete is pre-cast between the steel plates and the upper flange. Step 2: transport the PEC structural beams completed in step 1 to the construction site for assembly, install the bottom formwork of the steel truss floor deck on both sides of the PEC structural beam, the bottom formwork of the steel truss floor deck is lower than the top surface of the precast concrete, the end of the bottom formwork of the steel truss floor deck is against the precast concrete side of the PEC structural beam, and the steel truss is fixed on the bottom formwork of the steel truss floor deck, so that the upper chord steel bars in the steel truss are placed on the top of the upper flange of the PEC structural beam, and the lower chord steel bars in the steel truss are placed on the top of the steel plate; Step 3: After completing step 2, weld the upper chord reinforcement to the top of the upper flange and weld the lower chord reinforcement to the top of the steel plate; Step 4: Cast concrete simultaneously on the top of the bottom formwork of the steel truss floor deck and on the top of the precast concrete, so that the cast-in-place concrete covers the upper flange and upper chord reinforcement of the PEC structural beam.
[0012] The present invention adopts the floor lowering treatment to reduce the floor height occupied by the floor. Compared with the connection method in which the floor is placed on the steel beam, the step of welding bolts on the top of the steel beam can be omitted, thereby improving the assembly efficiency of the floor. The PEC structural beam adopted by the present invention is different from the structure prefabricated in the factory in the prior art. The concrete on both sides of the web of the PEC structural beam is not all precast in the factory. A part is precast in the factory, and a part is reserved for post-casting at the construction site. The uncast part between the concrete precast in the factory and the upper flange of the PEC structural beam forms a support Table top: a thinner steel plate is pre-set on the supporting table top on both sides of the web in the factory, and the steel plate is welded to the web. After the PEC structural beam formed in the factory is transported to the construction site, the upper chord steel bars of the steel truss are welded to the top of the upper flange, and the lower chord steel bars of the steel truss are welded to the top of the steel plate. Finally, concrete is cast on the bottom formwork of the steel truss floor slab and the PEC structural beam, leaving the parts without pre-cast concrete. The connection structure formed in this way will not crack even if there is a step-by-step pouring of concrete, and the concrete surface of the floor slab formed is also continuous and complete. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a schematic diagram of the connection node between the PEC structural beam and the steel truss floor deck in the embodiment; Figure 2 It is the structural diagram of the prefabricated PEC structural beam; Figure 3 Schematic diagram of the plane structure of the steel plate.
[0014] Reference numerals: 1. Bottom formwork of steel truss floor slab; 2. PEC structural beam; 21. Precast concrete; 3. Upper chord steel bars; 4. Lower chord steel bars; 5. Steel plate; 51. Tie rod perforation; 6. Steel beam tie rod. DETAILED DESCRIPTION
[0015] 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.
[0016] This embodiment discloses a connection node between a PEC structural beam and a steel truss floor deck, such as Figure 1 As shown, it mainly includes a PEC structural beam 2, a steel truss floor deck bottom form 1, and a steel truss fixed on the top of the steel truss floor deck bottom form 1. The structure of the PEC structural beam 2 mentioned is as follows Figure 2 As shown, the interior is H-shaped steel, and a portion of concrete on both sides of the web of the H-shaped steel is pre-cast in the factory to form pre-cast concrete 21. The concrete on the upper part of the pre-cast concrete 21 is cast at the construction site at the same time as the floor slab. Figure 2As shown, a steel plate 5 is horizontally arranged below the upper flange of the H-shaped steel and on both sides of the web, and one end of the steel plate 5 is welded to the web. The steel plate 5 here is a thin steel plate, and its thickness is less than the thickness of the upper and lower flanges. The thickness of the steel plate 5 can be 2mm to 3mm. The distance between the steel plate 5 and the upper flange matches the distance between the upper chord steel bars 3 and the lower chord steel bars 4 of the steel truss. In the factory, pre-cast concrete is poured in the cavity between the steel plate 5 and the lower flange, and the cavity between the steel plate 5 and the upper flange does not need to be pre-cast with concrete. Steel beam tie bars 6 are arranged on both sides of the web of the H-shaped steel between the upper flange and the lower flange. The steel beam tie bars 6 are arranged parallel to the web, and the top end of the steel beam tie bars 6 is welded to the bottom of the upper flange, and the bottom end of the steel beam tie bars 6 is welded to the top of the lower flange. In order to facilitate the installation of the steel beam tie bars 6 and to be able to pass through the steel plate 5, the steel plate 5 in this embodiment is as shown Figure 3 As shown, the steel plate 5 has two side edges formed with open outer sides and inwardly recessed reinforcement holes 51, and the steel beam reinforcement 6 can pass through the reinforcement holes 51. After the PEC structural beam 2 is transported to the construction site, it is installed and positioned. The steel truss floor deck bottom formwork 1 is respectively set on both sides of the PEC structural beam 2, so that the steel truss floor deck bottom formwork 1 is lower than the steel plate 5, and the side ends of the steel truss floor deck bottom formwork 1 are placed against the precast concrete surface of the PEC structural beam 2, so that the upper chord steel bars 3 in the steel truss are laid and welded on the top of the upper flange, and the lower chord steel bars 4 in the steel truss are laid and welded on the top of the steel plate 5. Finally, concrete is poured on the upper part of the steel truss floor deck bottom formwork 1 and the upper part of the steel plate 5 at the same time. The concrete poured later on the construction site covers the upper flange and the upper chord steel bars 3. The thickness of the concrete covering the upper flange is not less than 35 mm, so that the concrete surface of the entire floor is continuous and complete, and does not occupy too much floor height.
[0017] The construction method of the connection node between the PEC structural beam and the steel truss floor deck comprises the following steps: Step 1: In the factory, steel plates 5 are respectively arranged on both sides of the web of the H-shaped steel. The steel plates 5 are parallel to the upper flange and are located between the upper and lower flanges and close to one end of the upper flange. Concrete is pre-cast between the steel plates 5 and the lower flange on both sides of the web, and no concrete is pre-cast between the steel plates 5 and the upper flange. Step 2: transport the PEC structural beam 2 completed in step 1 to the construction site for assembly, install the steel truss floor deck bottom formwork 1 on both sides of the PEC structural beam 2, the steel truss floor deck bottom formwork 1 is lower than the top surface of the precast concrete, the end of the steel truss floor deck bottom formwork 1 is against the precast concrete side of the PEC structural beam 2, and the steel truss is fixed on the steel truss floor deck bottom formwork 1, so that the upper chord steel bars 3 in the steel truss are placed on the top of the upper flange of the PEC structural beam 2, and the lower chord steel bars 4 in the steel truss are placed on the top of the steel plate 5; Step 3: After completing step 2, weld the upper chord reinforcement 3 to the top of the upper flange, and weld the lower chord reinforcement 4 to the top of the steel plate 5; Step 4: Cast in-situ concrete simultaneously on the upper part of the bottom formwork 1 of the steel truss floor deck and on the top of the precast concrete, so that the cast-in-situ concrete covers the upper flange of the PEC structural beam 2 and the upper chord steel bars 3.
[0018] 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. The connection node between the PEC structural beam and the steel truss floor deck comprises a PEC structural beam, a steel truss floor deck bottom formwork, and a steel truss fixed on the top of the steel truss floor deck bottom formwork, wherein the PEC structural beam comprises an H-shaped steel, and is characterized in that: Steel plates are arranged between the upper and lower flanges on both sides of the web of the H-shaped steel, the steel plates are parallel to the upper and lower flanges, the steel plates are located near one end of the upper flange, the steel plates are welded to the webs, concrete is precast in the factory between the steel plate and the lower flange, and no concrete is precast between the steel plate and the upper flange. A bottom formwork of a steel truss floor deck is arranged on both sides of the PEC structural beam, the bottom formwork of the steel truss floor deck is lower than the top surface of the precast concrete, the upper chord steel bars of the steel truss are welded to the top of the upper flange of the H-shaped steel, the lower chord steel bars of the steel truss are welded to the top of the steel plate, and concrete is poured simultaneously on the upper part of the bottom formwork of the steel truss floor deck and the upper part of the steel plate.
2. The connection node between the PEC structural beam and the steel truss floor deck according to claim 1 is characterized in that: The thickness of the steel plate is less than the thickness of the upper and lower flanges of the H-shaped steel.
3. The connection node between the PEC structural beam and the steel truss floor deck according to claim 1 is characterized in that: The thickness of the steel plate is 2 mm to 3 mm.
4. The connection node between the PEC structural beam and the steel truss floor deck according to claim 1 is characterized in that: The thickness of concrete covering the upper flange of the H-shaped steel shall not be less than 35mm.
5. The connection node between the PEC structural beam and the steel truss floor deck according to claim 1 is characterized in that: The distance between the steel plate and the upper flange of the H-shaped steel does not exceed the distance between the upper chord steel bars and the lower chord steel bars in the steel truss.
6. The connection node between the PEC structural beam and the steel truss floor deck according to claim 1, characterized in that: Steel beam reinforcement bars are arranged on both sides of the web of the PEC structural beam, the bottom of the steel beam reinforcement bars is fixed on the lower flange, the top of the steel beam reinforcement bars is fixed on the upper flange, and the edge of the steel plate is spaced to form open reinforcement through-holes, and the steel beam reinforcement bars pass through the reinforcement through-holes.
7. The construction method of the connection node between the PEC structural beam and the steel truss floor deck according to any one of claims 1 to 6, characterized in that: The steps include: Step 1: Steel plates are respectively set on both sides of the web of the H-shaped steel in the factory. The steel plates are parallel to the upper flange and located between the upper and lower flanges close to one end of the upper flange. Concrete is pre-cast between the steel plates and the lower flange on both sides of the web, and no concrete is pre-cast between the steel plates and the upper flange. Step 2: transport the PEC structural beams completed in step 1 to the construction site for assembly, install the bottom formwork of the steel truss floor deck on both sides of the PEC structural beam, the bottom formwork of the steel truss floor deck is lower than the top surface of the precast concrete, the end of the bottom formwork of the steel truss floor deck is against the precast concrete side of the PEC structural beam, and the steel truss is fixed on the bottom formwork of the steel truss floor deck, so that the upper chord steel bars in the steel truss are placed on the top of the upper flange of the PEC structural beam, and the lower chord steel bars in the steel truss are placed on the top of the steel plate; Step 3: After completing step 2, weld the upper chord reinforcement to the top of the upper flange and weld the lower chord reinforcement to the top of the steel plate; Step 4: Cast concrete simultaneously on the top of the bottom formwork of the steel truss floor deck and on the top of the precast concrete, so that the cast-in-place concrete covers the upper flange and upper chord reinforcement of the PEC structural beam.