CN202644841U

CN202644841U - Combination prefabricated superposed beam

Info

Publication number: CN202644841U
Application number: CN2012202990233U
Authority: CN
Inventors: 潘金龙; 尹万云; 马涛
Original assignee: China MCC17 Group Co Ltd
Current assignee: China MCC17 Group Co Ltd
Priority date: 2012-06-26
Filing date: 2012-06-26
Publication date: 2013-01-02
Anticipated expiration: 2022-06-26

Abstract

A combined prefabricated composite beam, which includes a prefabricated beam and a steel skeleton, the prefabricated beam includes a common concrete prefabricated beam in the middle, an ECC prefabricated block at the left end, and an ECC prefabricated block at the right end; the reinforced steel skeleton includes two lower Longitudinal reinforcement, two upper longitudinal reinforcements, multiple rectangular stirrups for binding these four reinforcements, four upper positioning angles welded to both ends of the two upper longitudinal reinforcements, four lower positioning angles welded to both ends of the two lower longitudinal reinforcements Angle steel; the four ends of the two upper longitudinal steel bars all extend out of the four upper positioning angle steels, and the four ends of the two lower longitudinal steel bars all shrink within the four lower positioning angle steels. The utility model is convenient for construction and overcomes the disadvantage of concentrated weak positions at the joints; it is not easy to be misplaced during construction and is convenient for positioning; it strengthens the structural integrity, enhances the shear resistance and ductility of the frame beam, and improves the seismic performance of the overall structure.

Description

A kind of combination Prefabricated superposed beam

Technical field

The utility model belongs to the Structural Engineering field, relates to a kind of combination Prefabricated superposed beam, is mainly used in the prefabricated integral frame structure.

Background technology

In the practice of construction process of prefabricated integral frame structure, the construction of prefabricated units junction location is difficult for, and has therefore reduced speed of application and efficient; For precast concrete, whether the quality of connection of member can be guaranteed is the key point that can total bring into play design function, and shear-carrying capacity and the ductility of precast construction junction are relatively poor usually, become easily the weak part in the structural system, thereby the safety of total is threatened; More existing achievements in research show that also the anti-seismic performance of fabricated assembly overall structure is compared relatively poor with cast-in-place concrete structure, still are worth carrying out deep research so how further to improve the anti-seismic performance of fabricated assembly overall structure.

Summary of the invention

The purpose of this utility model will overcome the above problems exactly, and a kind of combination Prefabricated superposed beam is provided, and is convenient to the location during construction, can improve the prefabricated integral frame structural seismic performance simultaneously.

The technical solution of the utility model is achieved like this: a kind of combination Prefabricated superposed beam, be characterized in: it comprises precast beam and cage of reinforcement, precast beam comprises the ordinary concrete precast beam 1 at middle part, the ECC prefabricated section 2 of left end, the ECC prefabricated section of right-hand member, and wherein the length of ECC prefabricated section is about half of beam height overall; Cage of reinforcement comprises the rectangle stirrup 5 that two bottom longitudinal reinforcements 3, two top longitudinal reinforcements 4, these four reinforcing bars of a plurality of colligation use, location, the four tops angle steel 7 that is welded on two top longitudinal reinforcement 4 two ends, location, the four bottoms angle steel 6 that is welded on two bottom longitudinal reinforcement 3 two ends; Top longitudinal reinforcement 4 and bottom longitudinal reinforcement 3 stagger mutually at link position separately, all stretch out outside the angle steel 7 of location, four top four terminations of two top longitudinal reinforcements 4, and four terminations of two bottom longitudinal reinforcements 3 all shrink within the angle steel 6 of location, four bottoms; Precast beam is positioned at the Lower Half of rectangle stirrup 5.Two bottom longitudinal reinforcements 3 and two top longitudinal reinforcement 4 colligations are on four angles of rectangle stirrup 5.

The utlity model has following effect: 1, the utility model adopts the structure that staggers up and down in the bar splice of node junction, the shortcoming that can avoid the junction weak location to concentrate.2, arranging of angle steel makes things convenient for reinforcing bar and angle steel to weld, and avoided overhead welding, convenient construction; And the junction links to each other by angle steel can increase its shear resistance, and the rigidity of angle steel is large than reinforcing bar, is not easy the changing of the relative positions in the time of construction, convenient location.During construction with after water superposed beam and build, can strengthen structural integrity.3, the areas of plasticity hinge at the beam two ends adopts the ECC material can give full play to the large characteristics of ECC material deformation ability, can strengthen the ductility of combination precast beam when earthquake, improve the absorbed energy of frame construction and the ability of dissipation energy, thereby improved the anti-seismic performance of prefabricated integral frame structure.4, beam two end regions are owing to be subject to larger shearing, and the shear resistance of ECC material is stronger, is used in the shear resistance that the beam-ends areas of plasticity hinge can increase Vierendeel girder, even can reduce the usage quantity of stirrup.5, the characteristics of ECC material cracking are fine and closely woven multiple crackses, and certain self-healing performance is arranged, and are behind beam-ends cracking under little shake or the middle shake effect, less on the durability impact of structure.

Description of drawings

Fig. 1 is elevation of the present utility model.

Fig. 2 is top view of the present utility model.

Fig. 3 is upward view of the present utility model.

Fig. 4 is disconnected sectional view of the present utility model.

Among the figure: 1-ordinary concrete precast beam; 2-ECC prefabricated section; 3-bottom longitudinal reinforcement; 4-top longitudinal reinforcement; 5-stirrup; Location, 6-bottom angle steel; Location, 7-top angle steel.

The specific embodiment

ECC namely is the abbreviation of Engineered Cementitious Composites, is a kind of novel concrete based composites with superpower toughness, and then this material adds synthetic fibers and form take cement and fine sand as filler.Existing achievement in research shows, the ultimate tensile strength value of this material can be stablized and reaches 3%-5%, is approximately about 100～300 times of common concrete material, is about 5～10 times of reinforcing bar.The ECC material not only has the toughness of superelevation, and the characteristics of the stable states of seam more than having cracking, make it that excellent performance be arranged at aspects such as safety, durability, applicabilities, can solve well the many disadvantages that conventional concrete causes owing to fragility, weak draftability.ECC has stronger energy absorption capability simultaneously, and higher shear strength also provides new selection for seismic design of structures.

The turning power of beam-ends has important effect to the anti-seismic performance of structure in the frame construction, and the ductility of the larger then beam-ends of turning power is better, therefore more is conducive to structure and absorbs and the dissipation seismic energy.Therefore the expectation plastic hinge region can have larger turning power during structure design.

The utility model comprises precast beam and cage of reinforcement, and precast beam comprises the ordinary concrete precast beam 1 at middle part, the ECC prefabricated section 2 of left end, the ECC prefabricated section of right-hand member, and wherein the length of ECC prefabricated section is about half of beam height overall; Cage of reinforcement comprises the rectangle stirrup 5 that two bottom longitudinal reinforcements 3, two top longitudinal reinforcements 4, these four reinforcing bars of a plurality of colligation use, location, the four tops angle steel 7 that is welded on two top longitudinal reinforcement 4 two ends, location, the four bottoms angle steel 6 that is welded on two bottom longitudinal reinforcement 3 two ends; Top longitudinal reinforcement 4 and bottom longitudinal reinforcement 3 stagger mutually at link position separately, all stretch out outside the angle steel 7 of location, four top four terminations of two top longitudinal reinforcements 4, all contracts within the angle steel 6 of location, four bottoms in four terminations of two bottom longitudinal reinforcements 3; Precast beam is positioned at the Lower Half of rectangle stirrup 5.Two bottom longitudinal reinforcements 3 and two top longitudinal reinforcement 4 colligations are on four angles of rectangle stirrup 5.

Construction application process of the present utility model is:

1. at first according to design, set up moulding board of precast beam, the assembling reinforcement cage, and indulge the welding of muscle two ends in top and the bottom and locate angle steel.

2. then build respectively ordinary concrete and ECC prefabricated section at the design attitude place, treat after the concrete initial set, carry out the plucking processing at precast beam end face and side, beam two ends, and maintenance.

3. treat that concrete curing to the stipulated time, can construct.First the overhanging steel bar welding that goes out angle steel is connected on the angle steel of corresponding position during construction, positions, then can build at prefabricated back place ordinary concrete and build the ECC prefabricated section in the junction, finish the construction of superposed beam.

Claims

1. A combined prefabricated composite beam, characterized in that it includes a prefabricated beam and a steel skeleton, and the prefabricated beam includes a common concrete prefabricated beam (1) in the middle, an ECC prefabricated block (2) at the left end, and an ECC prefabricated block at the right end Prefabricated block; the reinforcement skeleton includes two lower longitudinal reinforcements (3), two upper longitudinal reinforcements (4), a plurality of rectangular stirrups (5) for binding the four reinforcements, welded on the two upper longitudinal reinforcements (4) The four upper positioning angle steels (7) at both ends, and the four lower positioning angle steels (6) welded to the two ends of the two lower longitudinal steel bars (3); the four ends of the two upper longitudinal steel bars (4) are all extended In addition to the four upper positioning angle steels (7), the four ends of the two lower longitudinal steel bars (3) are all retracted within the four lower positioning angle steels (6); the prefabricated beam is located under the rectangular stirrups (5) Half; two lower longitudinal reinforcing bars (3) and two upper longitudinal reinforcing bars (4) are bound on the four corners of the rectangular stirrups (5).

2. A composite prefabricated composite beam according to claim 1, characterized in that the lengths of the ECC prefabricated block (2) at the left end and the ECC prefabricated block at the right end are both about half of the beam height.

3. A composite prefabricated composite beam according to claim 1 or 2, characterized in that: the positions of the upper longitudinal reinforcement (4) and the lower longitudinal reinforcement (3) at their respective joints are staggered.