CN103541433B - Assembly concrete hook-hang type node - Google Patents

Abstract

The invention provides a prefabricated concrete hook-hung node, which is mainly composed of concrete columns, concrete beams, externally hung concrete beams and the like. It is characterized in that the concrete beams on both sides of the node are stepped, and the external concrete beams are flat sections. The column longitudinal reinforcement passes through the core area of the joint without truncating; the lower longitudinal reinforcement of the beam and the upper longitudinal reinforcement of the beam both pass through the core area of the joint without truncating. During installation, hook the lower longitudinal reinforcement hook of the external concrete beam and the upper longitudinal reinforcement hook of the beam to the longitudinal reinforcement ring at the bottom of the beam and the longitudinal reinforcement ring at the top of the beam respectively. The U-shaped stirrup hanging ring is arranged on the lower platform section of the concrete beam, and is hooked with the additional U-shaped stirrup hook of the external U-shaped stirrup. The effects and advantages of the invention are high bearing capacity, good plasticity and toughness, convenient construction, good economic effect and fast construction speed. It can adapt to the needs of modern engineering structures to develop into large spans, high towers, heavy loads and withstand harsh conditions, and meets the requirements of modern construction technology industrialization.

Description

Prefabricated concrete hook-hung node

technical field

The invention relates to a novel node of a building structure, in particular to an assembled concrete hook-hung node of an assembled concrete structure.

Background technique

Prefabricated concrete buildings refer to prefabricated concrete components produced in factories. Concrete structure housing buildings designed and constructed through on-site assembly. The assembly methods of components generally include on-site post-casting laminated layer concrete, steel bar anchoring and post-casting concrete connection, etc. The steel bar connection can be connected by sleeve grouting connection, welding, mechanical connection and lap connection of reserved holes. In the 1980s, prefabricated prefabricated large-slab houses, which were popular in my country, had many hidden dangers and defects that affected structural safety and normal use due to poor structural integrity, leakage, and floor cracks, and were gradually replaced by cast-in-place concrete structures. . However, with the current emerging application of prefabricated concrete structures, especially the introduction of many foreign advanced technologies in recent years, localized new technologies for the construction of prefabricated concrete structures are gradually forming.

With the acceleration of the process of "construction industrialization and housing industrialization" in China and the continuous reduction of China's "demographic dividend", the labor shortage in the construction industry has emerged, and the trend of housing industrialization has become increasingly obvious. The application of prefabricated concrete structures has become a current research hotspot again, and new technologies and new forms of prefabricated concrete structures for residential buildings are emerging all over the country. Prefabricated reinforced concrete structure is one of the important directions for the development of my country's building structure. It is conducive to the development of my country's building industrialization, improving production efficiency and saving energy, developing green and environmentally friendly buildings, and is conducive to improving and ensuring the quality of construction projects. Compared with the cast-in-place construction method, the prefabricated RC structure is conducive to green construction, because the prefabricated construction can better meet the requirements of green construction, such as land saving, energy saving, material saving, water saving and environmental protection, and reduce the negative impact on the environment. Including reducing noise, preventing dust, reducing environmental pollution, clean transportation, reducing site disturbance, saving water, electricity, materials and other resources and energy, and following the principles of sustainable development. Moreover, the prefabricated structure can continuously complete multiple or all processes of the project in sequence, thereby reducing the types and quantities of construction machinery entering the site, eliminating the idle time between processes, realizing three-dimensional cross operations, reducing construction personnel, and improving work efficiency , Reduce material consumption, reduce environmental pollution, and provide guarantee for green construction. In addition, the prefabricated structure can reduce construction waste to a large extent (accounting for about 30%-40% of the total urban waste), such as waste steel bars, waste iron wires, waste bamboo wood, waste concrete, etc.

Prefabricated concrete buildings can be divided into two categories: full assembly and partial assembly according to the degree of assembly. Fully assembled buildings are generally limited to low-rise or multi-storey buildings with low seismic fortification requirements; the main components of partially assembled concrete buildings are generally prefabricated components, which are connected by cast-in-place concrete on site to form a building with an assembled monolithic structure.

In North America, mainly the United States and Canada, due to the long-term research and promotion of precast buildings by the Precast/Prestressed Concrete Association (PCI), the relevant standards and specifications for precast concrete are also very complete. Therefore, its prefabricated concrete building application is very common. Prefabricated buildings in North America mainly include two series of building prefabricated exterior walls and structural prefabricated components. The common feature of prefabricated components is the combination of large-scale and prestress. Structural reinforcement and connection construction can be optimized. Reduce the workload of production and installation, shorten the construction period, and fully reflect the characteristics of industrialization, standardization and technical economy. In the 20th century, prefabricated buildings in North America were mainly used in low-rise non-seismic fortified areas. Due to the impact of earthquakes in the California area, in recent years, great attention has been paid to the engineering application technology research of earthquake resistance and mid-rise prefabricated structures. PCI has recently published the book "Seismic Design of Precast Concrete Structures", which systematically analyzes the seismic design of prefabricated buildings from the perspective of theory and practice, and summarizes the latest scientific research achievements in the seismic design of prefabricated structures. Promotion has a strong guiding significance.

Europe is the birthplace of prefabricated buildings, and the road to industrialization of buildings began as early as the 17th century. After the Second World War, due to the shortage of labor resources, Europe further studied and explored the industrialization model of construction. Whether it is economically developed Northern Europe, Western Europe, or economically underdeveloped Eastern Europe, they have been actively promoting the design and construction of prefabricated concrete buildings. Accumulated a lot of experience in the design and construction of prefabricated buildings, formed various special prefabricated building systems and standardized general prefabricated product series, and compiled a series of precast concrete engineering standards and application manuals, which played a role in promoting the application of precast concrete in the world very important role.

Japan and South Korea have learned from the successful experience of Europe and the United States, on the basis of exploring the standardized design and construction of prefabricated buildings. Combined with their own requirements. Breakthroughs have been made in the integral seismic and isolation design of prefabricated structural systems. Representative achievements are the two 58-story Tokyo Towers built in Japan in 2008 using prefabricated frame structures. At the same time, the standard specifications for the design, production and construction of precast concrete building systems in Japan are also very complete. The prefabricated specifications currently in use include "Precast Concrete Engineering" (JASSl0) and "Concrete Curtain Wall) (JASSl4).

my country began to study the design and construction technology of prefabricated concrete buildings in the 1950s and 1960s, and formed a series of prefabricated concrete building systems. The more typical building systems include prefabricated single-storey industrial plant building systems and prefabricated multi-storey frame buildings. system, prefabricated slab building system, etc. By the 1980s, the application of prefabricated concrete buildings reached its heyday, and many parts of the country have formed a prefabricated concrete industrialized building model integrating design, production, construction and installation. Prefabricated concrete buildings and masonry buildings with prefabricated hollow-core slabs have become the two most important building systems, with an application penetration rate of over 70%. Due to the many limitations and deficiencies in the functions and physical properties of prefabricated buildings, the level of design and construction technology research and development of prefabricated concrete buildings in China has not kept up with the changes in social needs and the development of construction technology. By the mid-1990s, prefabricated concrete Buildings have been gradually replaced by all-cast-in-place concrete building systems. At present, except for the prefabricated single-story industrial plant building system, which is widely used. There are very few engineering applications of other prefabricated building systems. Insufficient research on the anti-seismic integrity of prefabricated structures and professional design and construction management results in poor technical and economic efficiency. It is the root cause of the long-term stagnation of prefabricated structures.

Contents of the invention

The purpose of the present invention is to provide a prefabricated concrete hook-type joint, mainly to develop a prefabricated structural joint with good integrity, clear force transmission, simple structure, safety and reliability, material saving and convenient construction. Beam-column joints, as a key link in building structures, will directly determine the feasibility of applying a new type of building structure in practical engineering. Among them, the force transmission method and the construction technology should be the two most important links in the joint design, and a good joint form should have a good unity in these two links. The invention aims to develop a joint structure form which is convenient for construction and has good seismic performance.

The purpose of the present invention is achieved through the following technical solutions,

The prefabricated concrete hook-hung joint is mainly composed of concrete columns, concrete beams, core areas of beam-column joints, column longitudinal reinforcement, beam lower longitudinal reinforcement, beam upper longitudinal reinforcement, column stirrups, beam stirrups, and U-shaped beams with hanging rings. Stirrups, U-shaped stirrup rings, additional U-shaped stirrup hooks, externally suspended concrete beams, externally suspended concrete beam upper longitudinal reinforcements, externally suspended concrete beam lower longitudinal reinforcements, externally suspended concrete beam stirrups, beam bottom longitudinal reinforcement rings, beam lower parts It consists of hooks for longitudinal reinforcement, rings for longitudinal reinforcement at the top of the beam, hooks for longitudinal reinforcement at the upper part of the beam, additional U-shaped stirrups, and the lower step section of the concrete beam. It is characterized in that the concrete beams on both sides of the node are stepped, and the external concrete beams are flat sections. The longitudinal reinforcement of the column passes through the core area of the joint without being cut off; the lower longitudinal reinforcement of the beam and the upper longitudinal reinforcement of the beam both pass through the core area of the joint without being cut off. The ring and the hanging ring of the longitudinal reinforcement on the top of the beam; the upper longitudinal reinforcement of the external concrete beam and the lower longitudinal reinforcement of the external concrete beam protrude, and the hooks of the lower longitudinal reinforcement of the beam and the upper longitudinal reinforcement of the beam are set; The beam lower longitudinal reinforcement hook and the beam upper longitudinal reinforcement hook are respectively hooked on the beam bottom longitudinal reinforcement ring and the beam top longitudinal reinforcement ring, and the beam lower longitudinal reinforcement hook and the beam upper longitudinal reinforcement hook are bent into a closed ring. U-shaped stirrup hanging rings are arranged on the lower platform section of the concrete beam, and are hooked with the additional U-shaped stirrup hooks of the external U-shaped stirrups, and then bent into a closed ring after being hooked by the additional U-shaped stirrup hooks. Concrete is poured on site between the concrete beam and the externally hung concrete beam, and the grade of the cast-in-place concrete is 1 or 2 grades higher than that of the concrete beam and the externally hung concrete beam. The planes of the longitudinal reinforcement rings at the bottom of the beam and the longitudinal reinforcement rings at the top of the beam are both horizontal, and the exposed sections of the longitudinal reinforcement rings at the bottom of the beam and the longitudinal reinforcement rings at the top of the beam should be smaller than the stirrup spacing.

The effects and advantages of the invention are high bearing capacity, good plasticity and toughness, convenient construction, good economic effect and fast construction speed. It can adapt to the needs of modern engineering structures to develop into large spans, high towers, heavy loads and withstand harsh conditions, and meets the requirements of modern construction technology industrialization. The present invention is made on the basis of summarizing the prior art and repeated experiments and calculations.

Description of drawings

Figure 1 is a schematic diagram of a prefabricated concrete hook-hung node;

Figure 2 is a schematic diagram of a prefabricated concrete hook-hung node and an externally hung concrete beam.

In the figure, 1 is the concrete column; 2 is the concrete beam; 3 is the core area of the beam-column joint; 4 is the column longitudinal reinforcement; 5 is the lower longitudinal reinforcement of the beam; 6 is the upper longitudinal reinforcement of the beam; 7 is the column stirrup; 8 is the beam Stirrups; 9 is U-shaped stirrups with hanging rings on beams; 10 is U-shaped stirrups hanging rings; 11 is additional U-shaped stirrup hooks; 12 is externally hung concrete beams; 15 is the stirrup of the external concrete beam; 16 is the ring for the longitudinal reinforcement at the bottom of the beam; 17 is the hook for the longitudinal reinforcement at the lower part of the beam; 18 is the ring for the longitudinal reinforcement at the top of the beam; 19 is the hook for the upper longitudinal reinforcement of the beam; 20 21 is the lower step section of the concrete beam.

Detailed ways

The present invention will be described in detail below in combination with technical solutions and with reference to the accompanying drawings.

The prefabricated concrete hook-hung node proposed by the present invention is shown in Figures 1-2.

The whole device is mainly composed of concrete column 1, concrete beam 2, core area of beam-column joint 3, column longitudinal reinforcement 4, beam lower longitudinal reinforcement 5, beam upper longitudinal reinforcement 6, column stirrup 7, beam stirrup 8, beam belt hanging ring U-shaped stirrup 9, U-shaped stirrup ring 10, additional U-shaped stirrup hook 11, external concrete beam 12, external concrete beam upper longitudinal reinforcement 13, external concrete beam lower longitudinal reinforcement 14, external concrete beam stirrup 15 1, beam bottom longitudinal reinforcement ring 16, beam lower longitudinal reinforcement hook 17, beam top longitudinal reinforcement ring 18, beam upper longitudinal reinforcement hook 19, additional U-shaped stirrup 20 and concrete beam lower ladder section 21 etc. composition.

According to the requirement of prefabricating concrete nodes and external concrete beams 12, the concrete beams 2 on both sides of the nodes are stepped, and the external concrete beams 12 are flat sections. The column longitudinal reinforcement 4 passes through the core area of the joint without being cut off, the lower longitudinal reinforcement 5 of the beam and the upper longitudinal reinforcement 6 of the beam both pass through the core area of the joint without being cut off, all the lower longitudinal reinforcement 5 of the beam and the upper longitudinal reinforcement 6 of the beam are respectively set at both ends The longitudinal reinforcement ring 16 at the bottom of the beam and the longitudinal reinforcement ring 18 at the top of the beam; the upper longitudinal reinforcement 13 of the external concrete beam 12 and the lower longitudinal reinforcement 14 of the external concrete beam of the external concrete beam 12 are all extended, and the lower longitudinal reinforcement hook 17 of the beam and the upper longitudinal reinforcement of the beam are provided. Longitudinal reinforcement hook 19; when installing, hook the beam lower longitudinal reinforcement hook 17 and the beam upper longitudinal reinforcement hook 19 of the external concrete beam 12 on the beam bottom longitudinal reinforcement ring 16 and the beam top longitudinal reinforcement ring 18 respectively, and place the beam The lower longitudinal reinforcement hook 17 and the beam upper longitudinal reinforcement hook 19 are bent into a closed loop. U-shaped stirrup ring 10 is arranged on the lower platform section 21 of the concrete beam, and is hooked with the additional U-shaped stirrup hook 11 of the external U-shaped stirrup 20, and the additional U-shaped stirrup hook 11 is hooked and then bent into a closed ring. Concrete is poured on site between the concrete beam 2 and the externally hung concrete beam 12, construction and assembly with reference to the accompanying drawings.

Claims (2)

1. A prefabricated concrete hook-hung joint, consisting of concrete column (1), concrete beam (2), core area of beam-column joint (3), column longitudinal reinforcement (4), beam lower longitudinal reinforcement (5), beam Upper longitudinal reinforcement (6), column stirrup (7), beam stirrup (8), beam U-shaped stirrup with ring (9), U-shaped stirrup ring (10), additional U-shaped stirrup hook (11), externally hung concrete beams (12), upper longitudinal bars of externally hung concrete beams (13), lower longitudinal bars of externally hung concrete beams (14), externally hung concrete beam stirrups (15), longitudinal bar hanging rings at the bottom of beams (16), The lower longitudinal reinforcement hook of the beam (17), the longitudinal reinforcement hanging ring at the top of the beam (18), the upper longitudinal reinforcement hook of the beam (19), the additional U-shaped stirrup (20) and the lower step section of the concrete beam (21), its characteristics The reason is that: the concrete beams (2) on both sides of the joint are stepped, while the external concrete beam (12) is a plane section, the column longitudinal reinforcement (4) passes through the core area of the joint without truncating; the longitudinal reinforcement (5) of the lower part of the beam and the upper part of the beam The longitudinal reinforcement (6) passes through the core area of the joint without truncating, and all the lower longitudinal reinforcement (5) of the beam and the upper longitudinal reinforcement (6) of the beam are respectively provided with the longitudinal reinforcement hanging ring (16) at the bottom of the beam and the longitudinal reinforcement at the top of the beam Hanging ring (18); the upper longitudinal reinforcement (13) of the externally hung concrete beam (12) and the lower longitudinal reinforcement (14) of the externally hung concrete beam are all extended and the lower longitudinal reinforcement hook (17) of the beam and the upper longitudinal reinforcement of the beam are set Hook (19); when installing, hook the lower longitudinal reinforcement hook (17) of the external concrete beam (12) and the upper longitudinal reinforcement hook (19) of the beam to the longitudinal reinforcement ring (16) at the bottom of the beam and the longitudinal reinforcement at the top of the beam respectively on the hanging ring (18), and bend the beam lower longitudinal reinforcement hook (17) and the beam upper longitudinal reinforcement hook (19) into a closed ring, and set the U-shaped stirrup hanging ring (10) on the lower step section (21) of the concrete beam , and hooked with the additional U-shaped stirrup hook (11) of the external U-shaped stirrup (20), and the external U-shaped stirrup hook (11) is hooked and then bent into a closed ring, and the concrete beam (2) and the external concrete beam Concrete is poured on site between (12), and the cast-in-place concrete grade is 1 or 2 grades higher than the concrete of the concrete beam (2) and the externally hung concrete beam (12). 2. The prefabricated concrete hook-hung node according to claim 1, characterized in that the planes where the longitudinal reinforcement rings (16) at the bottom of the beam and the longitudinal reinforcement rings (18) at the top of the beam are located are both horizontal, and the longitudinal reinforcement at the bottom of the beam The exposed sections of the hanging ring (16) and the beam top longitudinal reinforcement hanging ring (18) should be smaller than the stirrup spacing.