CN207919746U - A kind of prefabricated node of high-strength high concrete assembled frame of ductility - Google Patents

Abstract

The utility model provides a prefabricated joint of a high-strength and high-ductility concrete assembled frame. The four ends of the prefabricated high-strength and high-ductility concrete beam-column joint, the two ends of the prefabricated reinforced concrete column, and the two ends of the prefabricated reinforced concrete beam all have reserved longitudinal bars. The end of the longitudinal reinforcement is provided with an anchor plate, and the upper beam longitudinal reinforcement and beam stirrup of the prefabricated reinforced concrete beam and the prefabricated high-strength and high-ductility concrete beam-column joint are exposed, and the prefabricated reinforced concrete column and the prefabricated high-strength There is a reserved core column in the middle of the bottom end of the column. Due to the high tensile strength and tensile strain hardening characteristics of high-strength and high-ductility concrete, the use of reserved stirrups can be reduced or even eliminated, avoiding the bending and anchoring of beam reinforcement, and solving the problem of reinforcement congestion in the joint area. The joint beam-column longitudinal reinforcement is not disconnected in the joint core area, avoiding the connection of steel bars in the joint core area with complex stress, and instead connecting at the column inflection point with small bending moment, which greatly improves the integrity and seismic performance of the structure.

Description

A high-strength and high-ductility concrete prefabricated frame prefabricated joint

technical field

The utility model belongs to the technical field of concrete structures of prefabricated concrete structures and connection methods, and in particular relates to a prefabricated node of a high-strength and high-ductility concrete prefabricated frame.

Background technique

Frame structure is one of the most commonly used structural forms in precast concrete structures. Because its components are lighter than box structures, prefabricated slab structures or prefabricated shear wall structures, prefabricated concrete frame structures have more advantages in the transportation of components. And the prefabricated frame structure is one of the high-rise frame structure systems, and there have been engineering applications of prefabricated concrete frame structures in high-rise buildings abroad.

The connection of prefabricated beams and columns at the beam-column joints is a commonly used connection method in prefabricated frame structures, but it is difficult to guarantee the pouring quality of post-cast concrete on site, and under the action of strong earthquakes, the core area of the frame beam-column joints generates a large shear force , resulting in a significant decrease in the shear stiffness of the joint core area and serious damage. The earthquake damage investigations of various major earthquakes found that: in buildings that collapsed as a whole, the prefabricated beams and columns were less damaged, and the main cause of the collapse was the frame structure. The connection between the various components in the interior is damaged. Since the prefabricated components in the factory can well guarantee the quality of the prefabricated components, prefabricating the frame joints in the factory is an effective way to ensure the quality of concrete pouring in the joint area.

To prefabricate the joint area, it is necessary to connect the beams and columns where the stress is small, and the quality of the post-cast concrete should be guaranteed. At present, China's prefabricated frame structure mainly uses sleeve grouting to connect steel bars, and then pours ordinary concrete in the core area of the joints. There are mainly the following problems: (1) Due to the large volume, heavy weight and complex connection structure of prefabricated components, In addition, the labor force level in China's construction industry is low, which increases the difficulty of prefabricated building construction that requires a high degree of refinement; (2) Both the sleeve grouting connection and the restraint paddle-anchor connection are difficult to center and the operation is complicated. Disadvantages: Once the steel bars collide or have large errors during construction, the installation will not be possible, which will affect the construction period and cause waste; (3) When grouting into the sleeve, it is difficult to determine the state inside the sleeve, and the quality of grouting is difficult to inspect and grasp. Therefore, There are certain potential safety hazards; (4) Due to the brittleness of concrete itself, it is difficult to guarantee the seismic performance of the joint area under earthquake action.

Utility model content

The purpose of the utility model is to overcome the above-mentioned technical problems existing in the prior art, and to provide a prefabricated joint of a high-strength and high-ductility concrete assembly frame that is easy to construct, safe and reliable.

The technical scheme provided by the utility model is as follows:

A high-strength and high-ductility concrete prefabricated frame prefabricated joint, including prefabricated reinforced concrete columns, prefabricated high-strength and high-ductility concrete beam-column joints and prefabricated reinforced concrete beams, the four ends of the prefabricated high-strength and high-ductility concrete beam-column joints, prefabricated reinforced concrete columns Both ends of the prefabricated reinforced concrete beam have reserved longitudinal reinforcement, the end of the reserved longitudinal reinforcement is provided with an anchor plate, the prefabricated reinforced concrete beam and the beam upper beam longitudinal reinforcement of the prefabricated high-strength and high-ductility concrete beam-column joint and beam stirrups are exposed, and the prefabricated reinforced concrete columns and the prefabricated high-strength high-ductility concrete beam-column joints have reserved core columns in the middle of the column bottom;

The prefabricated high-strength and high-ductility concrete beam-column joints and the prefabricated reinforced concrete beams are overlapped at the overlapping section through reserved longitudinal bars, and the upper part of the prefabricated reinforced concrete beams and the floor slab are cast-in-place concrete, and the prefabricated high-strength and high-ductility concrete beam-column joints pass through The prefabricated core column is supported on the lower prefabricated reinforced concrete column, and the two are lapped at the overlapping section through the reserved longitudinal reinforcement. The reserved longitudinal reinforcement is overlapped at the overlapping section, and the overlapping sections of the reserved longitudinal reinforcement at both ends are provided with spiral stirrups, and high-strength and high-ductility concrete is post-cast at the overlapping section.

A reserved stirrup is provided outside the reserved longitudinal reinforcement of the overlapping section.

The prefabricated high-strength and high-ductility concrete beam-column joints include high-strength and high-ductility concrete precast column ends and high-strength and high-ductility concrete precast beam ends, the height H of the high-strength and high-ductility concrete precast column ends is 0 to 2 times the column width, and the high-strength and high-ductility concrete precast column ends are 0 to 2 times the column width. The length L of the high ductile concrete prefabricated beam end is 0~2 times the beam height.

The reserved core column is 1/2-2/3 of the section of the prefabricated reinforced concrete column.

The overlapping length of the reserved longitudinal reinforcement in the overlapping section is 8 to 15 times the diameter of the reserved longitudinal reinforcement.

The diameter of the spiral stirrup is 4-8mm, the spacing of the stirrup is 20-30mm, and the circumferential diameter is 2-4 times the diameter of the reserved longitudinal reinforcement.

The anchoring plate is a round or square steel plate with a thickness of 10-20 mm and a diameter or side length of 2-3 times that of the reserved longitudinal reinforcement.

The beneficial effects of the utility model are:

(1) The core area of the joint and the ends of beams and columns are prefabricated with high-strength and high-ductility concrete, which can ensure good mechanical and seismic performance of the joint area.

(2) Transferring the connection of components in the prefabricated frame structure to the position where the beam and column are less stressed can ensure the reliability of component connection.

(3) Utilizing the ultra-high strength and bonding performance of high-strength and high-ductility concrete can greatly shorten the lap length of steel bars, and the connection between old and new concrete is reliable.

(4) High-strength and high-ductility concrete has the characteristics of high tensile strength and tensile strain hardening. Therefore, the use of stirrups can be reduced or even eliminated, avoiding the bending and anchoring of beam reinforcement, and solving the problem of reinforcement congestion in the joint area.

(5) High-strength and high-ductility concrete has the characteristics of ultra-high strength and high ductility, and the seismic performance of components is improved, so it can be used in high-intensity areas.

(6) The longitudinal reinforcement of the node column is not disconnected in the core area of the node, avoiding the connection of steel bars in the core area of the node with complex stress, and instead connecting at the inflection point of the column with a small bending moment, which greatly improves the integrity and stability of the structure. Anti-seismic performance.

(7) Since this kind of high-strength and high-ductility concrete assembled frame joint and its connection method do not use sleeves, it is easy to manufacture in the factory, the phenomenon is easy to install, the process is reduced, and the quality is easy to control without professionals, which is in line with the current situation in our country.

Further details will be described below in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is the assembling drawing of prefabricated beam-column member of the present utility model;

Fig. 2 is a diagram of the completed connection of post-cast high-strength and high-ductility concrete for prefabricated beam-column members of the present invention.

In the figure: 1. Prefabricated reinforced concrete columns; 2. Prefabricated high-strength and high-ductility concrete beam-column joints; 3. Prefabricated reinforced concrete beams; 4. Reserved longitudinal reinforcement; , Spiral stirrups; 8. Anchor plates; 9. Prefabricated core columns; 10. Reserved stirrups.

Detailed ways

Example 1:

This embodiment provides a high-strength and high-ductility concrete assembled frame prefabricated node, including a prefabricated reinforced concrete column 1, a prefabricated high-strength and high-ductility concrete beam-column node 2 and a prefabricated reinforced concrete beam 3, and the prefabricated high-strength and high-ductility concrete beam-column node 2, the two ends of the prefabricated reinforced concrete column 1, and the two ends of the prefabricated reinforced concrete beam 3 have reserved longitudinal reinforcement 4, and the ends of the reserved longitudinal reinforcement 4 are provided with anchor plates 8, and the prefabricated reinforced concrete beam 3 The upper beam longitudinal bars 5 and beam stirrups 6 of the prefabricated high-strength and high-ductility concrete beam-column joint 2 are all exposed, and the prefabricated reinforced concrete column 1 and the prefabricated high-strength high-ductility concrete beam-column joint 2 have prefabricated high-strength and high-ductility concrete beam-column joints. stay stem;

The prefabricated high-strength and high-ductility concrete beam-column node 2 and the prefabricated reinforced concrete beam 3 are lapped at the overlapping section through the reserved longitudinal reinforcement 4, and the upper part of the prefabricated reinforced concrete beam 3 is cast-in-situ concrete with the floor slab, and the prefabricated high-strength and high-ductility concrete The beam-column node 2 is supported on the lower prefabricated reinforced concrete column 1 through the prefabricated core column 9, and the two are lapped at the lap section through the reserved longitudinal reinforcement 4, and the upper prefabricated reinforced concrete column 1 is supported on the prefabricated high-strength high-strength column through the prefabricated core column 9. On the ductile concrete beam-column joint 2, the two are overlapped at the overlapping section through the reserved longitudinal reinforcement 4, and the overlapping joints of the reserved longitudinal reinforcement 4 at both ends are provided with spiral stirrups 7, and the overlapping sections are post-cast with high strength High ductility concrete.

Among them, the components of high-strength and high-ductility concrete are cement, fly ash, silica fume, sand, PVA fiber, steel fiber and water, wherein, in terms of mass percentage, cement: fly ash: silica fume: sand: water = 1 : 0-0.3: 0.1-0.4: 0.76: 0.22-0.32; based on the total volume of cement, fly ash, silica fume, sand and water mixed uniformly, the volume content of PE fiber is 1%-1.5%, The volume content of steel fiber is 0.5%-2%.

Since the high-strength and high-ductility concrete has the characteristics of high tensile strength and tensile strain hardening, the use of reserved stirrups 10 can be reduced or even eliminated, avoiding the bending and anchoring of beam reinforcement, and solving the problem of reinforcement congestion in the joint area.

As shown in FIG. 1 , the prefabricated beam-column components include prefabricated reinforced concrete columns 1 , prefabricated high-strength and high-ductility concrete beam-column nodes 2 and prefabricated reinforced concrete beams 3 . The prefabricated high-strength and high-ductility concrete beam-column joint 2 is prefabricated with high-strength and high-ductility concrete. The longitudinal reinforcement of the beam-column joint is not disconnected in the core area of the joint, which avoids the connection of steel bars in the core area of the joint with complex stress. The connection at the bending point greatly improves the integrity and seismic performance of the structure.

Because the sleeve is not used, the factory is easy to make, the phenomenon is easy to install, the process is reduced, and the quality is easy to control without professionals, which is in line with the current situation in our country.

Example 2:

On the basis of Embodiment 1, this embodiment provides a high-strength and high-ductility concrete fabricated frame prefabricated node as shown in FIG. 2 , and a reserved stirrup 10 is provided outside the reserved longitudinal reinforcement 4 of the overlap section.

High-strength and high-ductility concrete can reduce or even eliminate the use of reserved stirrups 10, but it can also be used in small quantities. On the one hand, it can avoid the bending and anchoring of beam reinforcement, solve the problem of reinforcement congestion in the joint area, and on the other hand, increase the connection reliability of the joint.

In this embodiment, the prefabricated high-strength and high-ductility concrete beam-column joint 2 includes high-strength and high-ductility concrete precast column ends and high-strength and high-ductility concrete precast beam ends, and the height H of the high-strength and high-ductility concrete precast column ends is 0 to 2 times that of the column width, the length L of the end of the high-strength and high-ductility concrete prefabricated beam is 0 to 2 times the beam height.

The reserved core column is 1/2-2/3 of the section of the prefabricated reinforced concrete column 1. The overlapping length of the reserved longitudinal reinforcement 4 in the overlapping section is 8 to 15 times the diameter of the reserved longitudinal reinforcement 4 . The diameter of the spiral stirrup 7 is 4-8 mm, the distance between the stirrups is 20-30 mm, and the circumferential diameter is 2-4 times the diameter of the reserved longitudinal reinforcement 4 . The anchor plate 8 is a round or square steel plate with a thickness of 10-20mm, and its diameter or side length is 2-3 times that of the reserved longitudinal reinforcement 4.

Assembly construction steps: Step 1) Prefabricated high-strength and high-ductility concrete beam-column node 2 is supported on the lower prefabricated reinforced concrete column 1 through the prefabricated core column 9, and then the reserved longitudinal reinforcement 4 is lapped at the lap joint and wound at the lap joint Spiral stirrups 7, then pour high-strength and high-ductility concrete, and connect the high-strength and high-ductility concrete beam-column node with the lower prefabricated reinforced concrete column 1;

Step 2) Hoist the prefabricated reinforced concrete beam 3 to the predetermined position, overlap the overlapping section through the reserved longitudinal reinforcement 4, wind the spiral stirrup 7 at the overlapping section, and bind the reserved longitudinal reinforcement 4 outside the overlapping section Stirrups 10, then pour high-strength and high-ductility concrete, and connect the high-strength and high-ductility concrete beam-column nodes with the left and right prefabricated reinforced concrete.

Wherein, the cement is PO 52.5R Portland cement; the fly ash is Class I fly ash; the loss on ignition of the silica fume is less than 6%, the silica content is greater than 85%, and the specific surface area is greater than 15,000 m ² /kg; the maximum particle size of the sand is 1.26mm; the length of the PE fiber is 6-12mm, the diameter is more than 20µm, the tensile strength is more than 3000MPa, and the modulus of elasticity is more than 85GPa; the steel fiber The steel fibers are copper-plated steel fibers with hooks, with a diameter of 0.22 mm, a length of 13 mm, and a tensile strength of 2800 MPa.

The ultra-high strength and bonding performance of high-strength and high-ductility concrete can greatly shorten the lap length of steel bars, and the connection between old and new concrete is reliable. High-strength and high-ductility concrete has the characteristics of ultra-high strength and high ductility, and the seismic performance of components is improved, so it can be used in high-intensity areas.

Example 3:

Referring to Fig. 1 and Fig. 2, in the high-strength and high-ductility concrete assembly frame joint of the present embodiment, the cross-sectional dimension of the prefabricated reinforced concrete column 1 is 500 mm long and 500 mm wide, and the cross-sectional dimension of the prefabricated reinforced concrete beam 3 is 300 mm wide and 600 mm long; The overlapping length of the longitudinal reinforcement 4 in the overlapping section is 8 mm; the diameter of the spiral stirrup 7 is 5 mm, the spacing between the stirrups is 25 mm, and the circumferential diameter is 3 times the diameter of the reserved longitudinal reinforcement 4; the anchor plate 8 is circular and has a thickness of 15mm, the diameter or side length is three times of the reserved longitudinal reinforcement 4; the height H of the high-strength and high-ductility concrete precast column end is 1 times the column width, and the length L of the high-strength and high-ductility concrete precast beam end is 1 times the beam height.

Example 4:

On the basis of Example 1, this example provides a high-strength and high-ductility concrete prefabricated frame connection method, using high-strength and high-ductility concrete prefabricated frame prefabricated nodes, including the following steps:

Step 1) The prefabricated high-strength and high-ductility concrete beam-column node 2 is supported on the lower prefabricated reinforced concrete column 1 through the prefabricated core column 9, and then lapped at the lap joint through the reserved longitudinal reinforcement 4, and the spiral stirrup 7 is wound at the lap joint , and then pour high-strength and high-ductility concrete to connect the high-strength and high-ductility concrete beam-column node to the lower prefabricated reinforced concrete column 1;

Step 2) Hoist the prefabricated reinforced concrete beam 3 to the predetermined position, overlap the overlapping section by reserving the longitudinal reinforcement 4, wind the spiral stirrup 7 at the overlapping section, and then pour high-strength and high-ductility concrete to place the high-strength and high-ductility concrete beam Column joints and left and right prefabricated reinforced concrete connections;

Step 3) After the hoisting of the prefabricated floor slab is completed, the steel bars of the floor slab are bound, the concrete is poured and then the layer is poured to form a laminated slab.

The parts not specifically described in this embodiment belong to common knowledge and technologies in the technical field, and will not be described in detail here.

The above examples are only illustrations of the utility model, and do not constitute a limitation to the protection scope of the utility model. All designs identical or similar to the utility model all belong to the protection scope of the utility model.

Claims (7)

1. a kind of prefabricated node of high-strength high concrete assembled frame of ductility, it is characterised in that：Including prefabricated reinforced concrete column （1）, prefabricated high-strength high ductility concrete beam and column node（2）And precast reinforced concrete beam（3）, the prefabricated high-strength high ductility is mixed Solidifying soil bean column node（2）Four ends, prefabricated reinforced concrete column（1）Both ends, precast reinforced concrete beam（3）Both ends have reserved Vertical muscle（4）, the reserved vertical muscle（4）End is equipped with anchor plate（8）, the precast reinforced concrete beam（3）With prefabricated high-strength height Ductility concrete beam and column node（2）Beam upper beam indulge muscle（5）And beam stirrup（6）It is exposed, the prefabricated reinforced concrete column （1）With prefabricated high-strength high ductility concrete beam and column node（2）Column center bottom have reserved stem；

The prefabricated high-strength high ductility concrete beam and column node（2）And precast reinforced concrete beam（3）Pass through reserved vertical muscle（4） Lap segment overlaps, precast reinforced concrete beam（3）Top and one piece of cast-in-place concrete of floor, the prefabricated high-strength high ductility coagulation Native bean column node（2）Pass through prefabricated core column（9）It is supported on lower part prefabricated reinforced concrete column（1）On, the two passes through reserved vertical muscle （4）It is overlapped in lap segment, top prefabricated reinforced concrete column（1）Pass through prefabricated core column（9）It is mixed to be supported on prefabricated high-strength high ductility Solidifying soil bean column node（2）On, the two passes through reserved vertical muscle（4）It is overlapped in lap segment, the reserved vertical muscle in the both ends（4）Lap-joint is equal Equipped with tie hoop（7）, lap segment pours high-strength high ductility concrete afterwards.

2. the prefabricated node of the high-strength high concrete assembled frame of ductility of one kind according to claim 1, it is characterised in that：Institute State the reserved vertical muscle of lap segment（4）Outside is equipped with reserved stirrup（10）.

3. the prefabricated node of the high-strength high concrete assembled frame of ductility of one kind according to claim 1, it is characterised in that：Institute State prefabricated high-strength high ductility concrete beam and column node（2）Including the high-strength high concrete prefabricated styletable of ductility and high-strength high ductility coagulation The prefabricated beam-ends of soil, the high-strength high concrete prefabricated styletable height H of ductility are that 0 ~ 2 times of column is wide, the high-strength high ductility coagulation The deck-molding that the prefabricated beam-ends length L of soil is 0 ~ 2 times.

4. the prefabricated node of the high-strength high concrete assembled frame of ductility of one kind according to claim 1, it is characterised in that：Institute It is prefabricated reinforced concrete column to state reserved stem（1）The 1/2-2/3 in section.

5. special according to a kind of prefabricated node of high-strength high concrete assembled frame of ductility of claim 1-4 any one of them Sign is：The reserved vertical muscle（4）The reserved vertical muscle for being 8 ~ 15 times in the lap segment lap of splice（4）Diameter.

6. special according to a kind of prefabricated node of high-strength high concrete assembled frame of ductility of claim 1-4 any one of them Sign is：The tie hoop（7）A diameter of 4 ~ 8mm, stirrup spacing are 20 ~ 30mm, circumferential a diameter of 2 ~ 4 times of reserved vertical muscle （4）Diameter.

7. special according to a kind of prefabricated node of high-strength high concrete assembled frame of ductility of claim 1-4 any one of them Sign is：The anchor plate（8）For round or square plate, thickness is 10 ~ 20mm, and diameter or the length of side are reserved vertical muscle（4）2 ~ 3 times.