A beam-column connection node and installation method for steel slide way jacking reverse construction

Abstract

The application discloses a beam-column connecting joint and mounting method for steel slide jacking reverse construction. When the steel slide jacking reverse construction is adopted, the beam-column joint and the local column in the upper part of the joint are cast in situ, the upper and lower two sections of the prefabricated column are connected through a steel plate, and the concrete is poured in the range surrounded by the steel plate, the local high-strength concrete is formed, and the steel pipe concrete column is formed. The beam longitudinal reinforcement can be reliably anchored in the steel pipe concrete, and is connected at the end of the beam through the hole expansion self-locking steel connector, and the longitudinal reinforcement installation in the beam range can be exempted from multiple tightening actions. The joint design and the mounting method are safe and reliable, can exempt from the formwork erection, are convenient for construction, are green and environmentally-friendly, and can be popularized and applied according to the new construction method.

Description

Technical Field

[0001] This invention relates to the field of building technology, specifically to a beam-column connection node and installation method for steel slideway jacking reverse construction. Background Technology

[0002] Currently, with the issuance of the "Guiding Opinions on Actively and Steadily Promoting the Renovation of Urban Villages in Mega- and Super-large Cities" in my country, steel sliding track jacking and floor-adding technology is being applied to the renovation of urban villages and cultural heritage buildings, and the technology is becoming increasingly mature. Meanwhile, new buildings in my country are typically constructed single-story, layer by layer from bottom to top, involving numerous high-altitude operations and frequent falls from heights. This necessitates the use of climbing formwork, scaffolding, and other construction safety measures, resulting in high safety costs and long construction cycles. Applying steel sliding track jacking and floor-adding technology to new buildings allows for construction near the ground, with additional floors added by jacking upwards. This innovative reverse construction method for above-ground new construction has broad application prospects. Summary of the Invention

[0003] The purpose of this invention is to provide a safe, reliable, and convenient beam-column connection node and installation method for the construction of new reinforced concrete frame structures using a steel slide jacking reverse construction method that eliminates the need for scaffolding or the use of climbing scaffolding.

[0004] To achieve the above objectives, the technical solution of the present invention is: a beam-column connection node and installation method for steel slideway jacking reverse construction, characterized by comprising the following steps:

[0005] Step 1: Design the cast-in-place zone of the beam-column joint according to the structural construction drawings, and use steel pipe concrete within the cast-in-place zone. Use expanded hole self-locking rebar connectors to connect the rebar in the beam-column joint area with the rebar on the beam surface and bottom of the beam.

[0006] Step 2: Use a self-locking rebar connector with enlarged holes to connect the longitudinal bars of the lower section of the top-floor precast column to the longitudinal bars of the middle section of the top-floor precast column;

[0007] Step 3: Install the upper bracket onto the lower section of the top-level precast column, and lift the lower section of the top-level precast column upwards to the design elevation;

[0008] Step 4: Fabricate the connecting steel plates in the factory and apply anti-corrosion coating. Weld the steel pipe columns within the beam-column joint area on site and reserve concrete vibration ports above the beam surface.

[0009] Step 5: Install the upper section of the precast column on the next floor and weld the steel pipe column to the embedded parts of the upper precast column;

[0010] Step 6: Weld the longitudinal reinforcement of the beam at the beam-column joint, pour the concrete for the floor beams, floor slabs and joint area, and vibrate the concrete in the joint area.

[0011] Step 7: Seal the reserved concrete vibration port and reserve grouting and grout outlet holes. Inject high-strength grout into the reserved concrete vibration area above the beam-column joint area. After grouting is completed, seal the injection and grout outlet holes.

[0012] Step 8: After the concrete and grout have reached the design strength, continue jacking until the next layer of precast intermediate columns can be installed.

[0013] The intermediate layer edge column beam-column joint designed in step one needs to consider the connection of longitudinal reinforcement between precast columns, and at the same time, the anchorage of the beam longitudinal reinforcement within the column cross-section needs to be considered.

[0014] In step two, the lower section of the top-level precast column needs to be aligned with the longitudinal reinforcement of the middle section precast column.

[0015] In step three, a long-stroke hydraulic jack is used to ensure that the next precast column can be installed after a single stroke is completed.

[0016] In step four, the steel plate installation needs to be welded to the embedded steel plates in the lower section of the top-floor precast column and the upper section of the next floor precast column.

[0017] In steps five, six, seven, and eight, concrete is poured within the beam-column joint area, while high-strength grouting material is used for grouting outside the joint area.

[0018] The beam-column connection node and installation method for steel slideway jacking reverse construction involved in this invention have the following beneficial effects:

[0019] This invention discloses a beam-column connection node and installation method for steel slideway jacking reverse construction. A portion of the existing reinforced concrete frame structure is lifted and temporarily fixed using a steel slideway. After welding steel plates and installing embedded parts at the beam-column connection node, the beam-column node and the floor slab of the corresponding floor are poured at a low height above the ground. Once the strength reaches the design value, the upward jacking continues to add more floors. This connection node is safe and reliable, requires no formwork, and has high construction efficiency, which can facilitate the widespread application of steel slideway jacking reverse construction. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic elevation view of the intermediate layer edge column beam-column joint disclosed in this invention. Figure 1 ;

[0022] Figure 2 This is a schematic elevation view of the intermediate layer edge column beam-column joint disclosed in this invention. Figure 2 ;

[0023] Figure 3 This is a schematic plan view of the intermediate layer edge column beam-column joint disclosed in this invention;

[0024] Figure 4 This is a schematic diagram of the precast column embedded part disclosed in this invention. Detailed Implementation

[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described below with reference to the accompanying drawings.

[0027] Step 1: First, determine the top and bottom elevations of beam 1 on the intermediate floor according to the structural construction drawings. Reserve a cast-in-place beam-column joint area 4 between the lower section of the precast column 2 on the top floor and the upper section of the precast column 3 on the intermediate floor. Reserve a concrete vibration port for the joint at the upper part of the cast-in-place beam-column joint area 4. The cast-in-place joint area uses steel-concrete composite columns, and pre-embeds longitudinal reinforcement and connectors (see...). Figure 1 , Figure 2 , Figure 3 );

[0028] Step 2: Install the lower section of the top-level precast column 2 of the side column into the steel slide rail 5 using specialized horizontal transport equipment, and connect the lower section of the top-level precast column 2 to the longitudinal reinforcement of the middle section of the top-level precast column using the enlarged hole self-locking rebar connector 6 (see...). Figure 4 );

[0029] Step 3: Install the upper bracket onto the lower section of the top precast column 2, and lift the upper bracket upwards so that the lower section of the top precast column is lifted to the design elevation;

[0030] Step 4: Install the steel plate 7 of the steel pipe concrete column. The steel plate 7 needs to be reliably welded to the pre-embedded steel plate 8 of the precast column. Insert the longitudinal reinforcement 9 of the beam through the pre-drilled hole of the steel plate 7 and screw the enlarged hole self-locking rebar connector 6 on the outside. The top of the steel plate 7 is reserved for concrete vibration.

[0031] Step 5: Install the upper section of the intermediate layer precast column 3, and reliably weld the precast column embedded steel plate 8 to the steel plate 7. Install the steel bracket on the lower section of the top layer precast column 2 onto the upper section of the intermediate layer precast column 3, and plug weld the column longitudinal reinforcement 10 to the embedded steel plate 8.

[0032] Step 6: Install the longitudinal bars, stirrups and tie bars in the beam using the expanded hole self-locking rebar connector 6. After the floor slab rebar is installed, pour the concrete in the beam, slab and beam-column joint area as a whole. Do not pour the concrete reserved for the vibration port for the time being.

[0033] Step 7: Reserve a sealing plate for the concrete vibration port. Reserve grouting and grout outlet holes in the sealing plate. Inject high-strength grout evenly into the sealing plate area through the grouting holes. After the grouting holes are evenly discharged, seal the grouting holes and grout outlet holes.

[0034] Step 8: After the poured concrete and grouting material reach the design strength, continue to lift the formed building and repeat the process multiple times to complete the superstructure.

[0035] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. However, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for installing beam-column connection nodes in reverse construction of steel sliding track jacking, characterized in that, The method includes the following steps: Step 1: Design the cast-in-place area of ​​the beam-column joint according to the structural construction drawings, determine the elevation of the intermediate floor beam, reserve the cast-in-place beam-column joint area between the lower section of the top floor precast column and the upper section of the intermediate floor precast column, reserve a concrete vibration port at the top of the cast-in-place beam-column joint area, and use steel pipe concrete within the cast-in-place area. Use expanded hole self-locking steel bar connectors to connect the steel bars in the beam-column joint area with the steel bars on the beam surface and bottom, and pre-embed the longitudinal reinforcement of the beam and the connectors. Step 2: Install the lower section of the top layer of the side column into the steel slideway using horizontal transport equipment, and connect the longitudinal reinforcement of the lower section of the top layer of the side column to the longitudinal reinforcement of the middle section of the top layer of the precast column using enlarged hole self-locking steel bar connectors. Step 3: Install the upper bracket onto the lower section of the precast column of the top floor, and use the upper bracket to lift the completed part of the building to the design elevation; Step 4: Install the steel plate of the steel-concrete composite column in the beam-column joint and reserve the concrete vibration port. The steel plate needs to be reliably welded to the lower section of the top layer precast column and the upper section of the middle layer precast column respectively. Insert the longitudinal reinforcement of the beam through the pre-drilled hole of the steel plate and screw the enlarged hole self-locking rebar connector on the outside. Step 5: Install the upper section of the intermediate layer precast column, and reliably weld the precast column to the steel plate embedded in the steel plate. Install the steel bracket on the lower section of the top layer precast column to the upper section of the intermediate layer precast column, and plug weld the column longitudinal reinforcement to the embedded steel plate. Step 6: Connect the longitudinal reinforcement bars in the beam to the reinforcement bars in the beam-column joint through the expanded hole self-locking steel bar connector, and install the beam stirrups and tie bars. After the floor slab reinforcement is installed, pour the concrete of the beam, slab and beam-column joint area as a whole, and leave the vibration port. Step 7: Seal the concrete vibratory inlet with a plate, leaving grouting and grout outlet holes in the plate. Inject high-strength grout evenly into the sealed area through the grouting holes. After the grout outlet holes are evenly filled with grout, seal the grouting and grout outlet holes. Step 8: After the poured concrete and grouting material reach the design strength, continue to lift the formed building and repeat the process multiple times to complete the superstructure. The intermediate layer edge column beam-column joint designed in step one needs to consider the connection of longitudinal reinforcement between precast columns, and at the same time, the anchorage of the beam longitudinal reinforcement within the column cross-section needs to be considered. In step two, the top-level lower precast column needs to be aligned with the longitudinal reinforcement of the middle precast column; In step three, a long-stroke hydraulic jack is used to ensure that the next precast column can be installed after a single stroke is completed. In step four, the steel plate installation needs to be welded to the embedded steel plate in the lower section of the top-floor precast column and the upper section of the next floor precast column; In steps five, six, seven, and eight, concrete is poured within the beam-column joint area, while high-strength grouting material is used for grouting outside the joint area.

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