CN-121976618-A - Inter-floor slab connecting node capable of enhancing earthquake resistance and construction method

CN121976618ACN 121976618 ACN121976618 ACN 121976618ACN-121976618-A

Abstract

The invention discloses a connecting node between floors capable of enhancing earthquake resistance and a construction method, and relates to the technical field of assembled steel structure buildings. The steel girder casting device comprises an integral frame, a filling layer, a casting layer, distributed steel bars, screw components and embedded pipelines, wherein the integral frame is of a space grid structure formed by welding transverse and longitudinal high-strength steel girders, double fixing is formed through reserved interfaces and the screw components, bidirectional restraint with steel girders is achieved, the filling layer is made of light heat-insulating materials and has weight reduction and heat-insulating functions, the internal embedded corrosion-resistant functional pipelines are embedded, the casting layer is made of high-strength light concrete and stressed cooperatively with the integral frame and the steel girders, and the distributed steel bars are fixed with the integral frame and paved in the casting layer, so that the anti-cracking performance is improved. The invention solves the problems of poor connection integrity, insufficient earthquake resistance, complicated construction, single function, thermal bridge effect and the like of the traditional floor slab and the steel beam, realizes the integration of connection, earthquake resistance, heat preservation and pipeline embedding, and is suitable for multi-layer and high-rise civil buildings, public buildings and industrial workshops.

Inventors

JIA LILI
Ai Weisi
CHEN ANYING
WANG ZIYAN
WANG JINGFENG
WANG WANQIAN

Assignees

合肥工业大学

Dates

Publication Date: 20260505
Application Date: 20260316

Claims (10)

1. The inter-floor slab connecting node capable of enhancing the earthquake resistance is characterized by comprising a plurality of integral composite floor slabs (1) connected through steel beams (7), wherein each integral composite floor slab (1) comprises an integral frame (5), a filling layer, a pouring layer, distributed steel bars, screw members (8) and embedded pipelines (3); The whole frame (5) is a space grid structure formed by mutually welding transverse and longitudinal high-strength steel keels, the keels are fixed by full welding after derusting treatment, reserved interfaces matched with flanges of the steel beams (7) are arranged on two sides of the bottom of the whole frame (5), through holes for through bolts are formed in the interfaces, and through holes for through bolts are formed in positions corresponding to the steel beams (7); the filling layer is made of light heat-insulating materials poured into the cavity of the integral frame (5), the light heat-insulating materials are in seamless fit with the inner wall of the profile steel keel, and a pipeline embedded channel is reserved in the light heat-insulating materials; the pouring layer is high-strength light concrete respectively poured at the top and the bottom of the integral frame (5), and is tightly combined with reserved interface edges of the integral frame (5) and the steel beam (7); The distributed steel bars comprise top and bottom longitudinal distributed steel bars (4) and top and bottom transverse distributed steel bars (4'), and the distributed steel bars are fixedly connected with the integral frame (5) and paved in the pouring layer; The screw member (8) is a high-strength bolt, the length of the screw member is suitable for the total thickness of the accessory block board frame and the steel beam, the screw member (8) vertically penetrates through the connection part of the floor slab and the steel beam through the reserved through hole, the head of the screw is of a special-shaped structure which is accurately meshed with the inner wall of the integral frame (5) and the clamping groove on the side face of the steel beam (7), and a bidirectional fixing effect of vertical direction compression fixing and horizontal direction constraint limiting is formed; The embedded pipeline (3) is a functional pipeline made of corrosion-resistant materials, is embedded in a special passage made of light heat-insulating materials and is fixed firmly, and does not interfere with the integral frame (5), the screw rod component (8) and the steel beam (7).
2. The connecting node between floors capable of enhancing earthquake resistance according to claim 1, wherein the high-strength section steel is a C-section steel, the section height of the C-section steel is 120-160mm, the flange width is 50-70mm, and the thickness is 2-3mm.
3. The floorslab connecting node capable of enhancing earthquake resistance according to claim 1, wherein the light heat insulation material is foam concrete (6), and 5% -8% of polypropylene fibers are doped in the foam concrete (6).
4. The connecting node between floors capable of enhancing earthquake resistance according to claim 1, wherein the high-strength lightweight concrete is lightweight aggregate concrete, the casting thickness of the top lightweight aggregate concrete (2) is 70-90mm, and the casting thickness of the bottom lightweight aggregate concrete (2') is 40-60mm.
5. The connection node between floors for enhancing earthquake-resistant performance according to claim 1, wherein the diameter of the longitudinally distributed steel bars is 8-12mm, the diameter of the transversely distributed steel bars is 14-18mm, and the spacing of the transversely distributed steel bars is 4500-4900mm.
6. The connecting node between floors capable of enhancing earthquake resistance according to claim 1, wherein 4-6 screw members (8) are uniformly arranged at the joint of each integral composite floor (1) and the steel beam, the diameter of each screw member (8) is 12-14mm, the strength grade is 6.8-10.9, and locknuts are adopted in a matched manner.
7. The connection node between floors capable of enhancing earthquake resistance according to claim 1, wherein through bolt through holes on the steel beams (7) are elliptical holes, the long axes of the elliptical holes are 14-16mm, the short axes of the elliptical holes are 18-22mm, elastic sealing gaskets are additionally arranged at reserved interfaces of the integral frames (5) and the steel beams (7), and the embedded pipelines (3) are water-electric heating pipelines and are made of PVC, PE or PPR.
8. The connection node between floors capable of enhancing earthquake resistance according to claim 1, wherein the integral frame (5) is integrally arranged with the keel joint of the adjacent floors, the joint of the adjacent floors is synchronously locked when the screw rod component (8) is screwed, and the integral frame (5), the top and bottom longitudinal distribution steel bars (4), the top and bottom transverse distribution steel bars (4'), the screw rod component (8) and the embedded pipeline (3) are prefabricated into a standardized module, so that accurate assembly is completed when leaving a factory.
9. A construction method based on the connecting node according to any one of claims 1-8, characterized by comprising a factory prefabrication stage and a field installation stage, comprising the following specific steps: (1) Factory prefabrication stage: a. processing a profile steel keel according to the design size, performing rust removal treatment on the keel, and processing a reserved interface and a screw through hole at the bottom of the integral frame (5) according to the section size of the steel beam (7); b. Welding the longitudinal and transverse keels into an integral frame (5) by adopting a full-welding process, and checking the reserved interface size and the screw hole position accuracy; c. Paving longitudinal steel bars (4) at the top and the bottom and transverse steel bars (4') at the top and the bottom, and fixedly connecting the longitudinal steel bars and the transverse steel bars with an integral frame (5); d. pouring a light heat-insulating material into the frame, and synchronously embedding an embedded pipeline (3) into the reserved channel and fixing the embedded pipeline firmly; e. pouring high-strength light concrete at the top and the bottom, and curing according to the standard until the concrete strength reaches the standard, so as to finish prefabrication of the monolithic composite floor slab (1); (2) And (3) field installation stage: a. cleaning a construction site, leveling, erecting a construction bracket, hoisting a steel beam (7) in place, fixing firmly, and correcting levelness, verticality and spacing of the steel beam; b. hoisting the prefabricated integral composite floor slab (1) above the steel beam (7), and enabling a reserved interface at the bottom of the integral frame (5) to be in butt joint with the flange of the steel beam (7) so as to ensure the alignment of screw holes; c. A screw member (8) is penetrated, the head of the screw is clamped into the clamping grooves of the integral frame (5) and the steel beam (7), and nuts are screwed down to realize the bidirectional fixation of the floor slab and the steel beam; d. Checking the connection gap between the integral composite floor slab (1) and the steel beam (7), and filling sealing materials at the joint if necessary; e. And (3) abutting the embedded pipeline, debugging, cleaning the construction site and completing the integral installation.
10. The construction method according to claim 9, wherein in the factory prefabrication stage d, the sealing treatment is performed on the integral frame (5) before pouring the light heat insulation material, in the factory prefabrication stage e, the accuracy of the reserved interface and the screw hole of the integral composite floor slab (1) is verified before leaving the factory, and in the field installation stage c, a torque wrench or an electric wrench is used for tightening nuts according to a specified torque.

Description

Inter-floor slab connecting node capable of enhancing earthquake resistance and construction method Technical Field The invention relates to the technical field of assembled steel structure buildings, in particular to a floor slab connecting node capable of enhancing earthquake resistance and a construction method. Background The industrialized development of the assembled steel structure building is rapid, and the problem of connection between the floor slab and the steel beam in the floor system is one of key factors influencing the efficient construction of the building. The floor is used as a main load bearing member in the horizontal direction, the steel beam is used as a main load bearing member vertical to the ground, the floor and the steel beam are required to work cooperatively through connecting nodes, and the connecting effect is directly related to the safety, the shock resistance and the construction speed of the building. The cast-in-situ reinforced concrete floor slab, the reinforced truss floor supporting plate, the precast concrete composite floor slab, the profiled steel sheet-concrete composite floor slab, the light slab floor slab and the like commonly used in the market generally have three core problems when being connected with a steel beam, namely, the integral of a connecting node is poor, mostly simple lap joint or single point fixation is adopted, horizontal direction constraint is insufficient, relative displacement is easy to occur under the action of an earthquake, horizontal load cannot be effectively transmitted, the connecting process is complex, wet operations such as field welding and pouring are relied on or the requirement on hoisting precision is strict, the assembly efficiency is low, the quality control difficulty is high, the function is single, the bearing connection is only stressed, the comprehensive requirements such as heat preservation and pipeline embedding are not met, and the later maintenance cost is high. Meanwhile, the existing connection mode is poor in heat preservation effect due to the fact that metal components are in direct contact to form a heat bridge, heat preservation measures are additionally added, and construction cost and working procedures are increased. In the prior art, no technology or product which can meet the requirements of 'effective and reliable connection, good lateral movement resistance and convenient and fast construction' of the floor slab and the steel beam exists, so that the research and development of the inter-floor slab connecting node and the construction method which have high integrity, strong shock resistance, high assembly efficiency and multiple functions are urgent requirements for pushing the high-quality development of the assembled steel structure building. Disclosure of Invention Aiming at the defects of the prior art, the invention provides the inter-floor slab connecting node capable of enhancing the earthquake resistance and the construction method, realizes the integrated connection of the floor slab and the steel beam, solves the problems of poor integrity, insufficient earthquake resistance, complicated construction, single function, thermal bridge effect and the like of the existing connecting node, and improves the safety, the assembly efficiency and the comprehensive performance of the building. In order to achieve the above purpose, the technical scheme of the invention is realized as follows: The utility model provides a can strengthen inter-floor connected node of shock resistance, includes a plurality of integral composite floor that pass through girder steel and connect, and every integral composite floor all includes whole frame, filling layer, pouring layer, distributed steel bar, screw rod component and pre-buried pipeline; The whole frame is a space grid structure formed by mutually welding transverse and longitudinal high-strength steel keels, the keels are fixed by full welding after derusting treatment, reserved interfaces matched with the flanges of the steel beams are arranged on two sides of the bottom of the whole frame, through holes of through bolts are formed in the interfaces, and through holes of the through bolts are formed in corresponding positions of the steel beams; the filling layer is made of light heat-insulating materials poured into the cavity inside the integral frame, the light heat-insulating materials are in seamless fit with the inner wall of the profile steel keel, and a pipeline embedded channel is reserved inside the light heat-insulating materials; The pouring layer is high-strength light concrete respectively poured at the top and the bottom of the integral frame and is tightly combined with the edges of the reserved interfaces of the integral frame and the steel beam; the distributed steel bars comprise top-bottom longitudinal distributed steel bars and top-bottom transverse distributed steel bars, and the distributed steel bars are fixedly connected with the