CN104532952A - Short angle iron connection type reinforced concrete assembling integrated frame and construction method thereof - Google Patents

Abstract

The invention discloses a short angle iron connection type reinforced concrete assembling integrated frame and a construction method of the short angle iron connection type reinforced concrete assembling integrated frame. The integrated frame comprises reinforced-concrete-prefabricated columns with short beam segments and reinforced-concrete-prefabricated beams. The two ends of the reinforced-concrete-prefabricated beams, the two ends of the reinforced-concrete-prefabricated columns and the ends of the short beam segments of reinforced-concrete-prefabricated columns are provided with short angle iron for connection. The upper faces of two branches of the short angle iron are provided with reserved bolt holes. The reinforced-concrete-prefabricated columns on the upper floor and the lower floor are connected through the short angle iron for connection by means of the high-strength friction type bolts. The reinforced-concrete-prefabricated beams are connected with the reinforced-concrete-prefabricated columns through the short angle iron at the ends of the reinforced-concrete-prefabricated beams and the short angle iron for connection at ends of the short beams of the reinforced-concrete-prefabricated columns by means of the high-strength friction type bolts. Fiber reinforced cement-based composite material is poured in the beam column connection region, and the assembling integrated frame structure is formed. The short angle iron connection type reinforced concrete assembling integrated frame and the construction method have the advantages of being clear and reliable in internal force transmission, simple and reasonable in stress, convenient, fast and efficient in construction method, good in whole performance, good in anti-seismic property and the like.

Description

Reinforced Concrete Assembled Integral Frame Connected by Short Angle Steel and Its Construction Method

Technical field:

The invention relates to a reinforced concrete assembled integral frame connected by short angle steels and a construction method thereof, which belongs to the field of construction engineering concrete frame structure technology and construction.

technical background:

Reinforced concrete prefabricated integrated frame structure is an important direction for the future development of building industrialization. It has the advantages of short economic cycle, high quality prefabricated components, less on-site wet work, less environmental pollution, faster construction progress, lower labor intensity of workers, and is conducive to energy saving and reduction. Consumption and environmental protection and other advantages. This structural system has been widely used in developed countries and has become the main form of new buildings in some countries. The connection technology is the core issue of the reinforced concrete prefabricated integrated frame structure, and it is also the weak link of the prefabricated frame structure. Only when the prefabricated components have reliable connections, have good overall performance and good ductility, can the structure be safe Reliable, with good shock resistance.

The connection reliability of the existing reinforced concrete assembly integral frame joints in our country is poor, and it is difficult to meet the requirements of structural crack resistance, integrity, and seismic performance. process. The new reinforced concrete assembly integral frame connection technology requires reliable connection quality to realize the transfer of specified internal force according to the design requirements, and to ensure the safety, integrity, and earthquake resistance of the overall structure; then try to simplify the connection structure and construction technology to reduce Effect of Uncertainty in Construction on Structural Performance to Improve Construction Efficiency of Nodal Connections.

Invention content:

Technical problem: The present invention provides a reinforced concrete assembled monolithic frame connected by short angle steel and its construction method, which makes the connection between reinforced concrete prefabricated columns and prefabricated columns, and between reinforced concrete prefabricated columns and prefabricated beams simple and reliable, and the construction operation is convenient , to speed up the construction progress and greatly improve the production efficiency. At the same time, the beam-column connection area has good ductility and overall performance, and the modified integral frame has good overall performance and seismic performance.

Technical content: In order to solve the above technical problems, the present invention provides a reinforced concrete assembled monolithic frame connected by short angle steel, the frame includes reinforced concrete prefabricated beams, reinforced concrete prefabricated columns with short beam sections,

The two ends of the reinforced concrete prefabricated beam are respectively connected to the first short angle steel with two legs, and the two legs of the first short angle steel have the first reserved bolt holes;

The upper and lower ends of the reinforced concrete prefabricated column are respectively equipped with second short angle steels for connection and with two limbs, and the two limbs of the second short angle steel have second reserved bolt holes;

The attached short beam section of the reinforced concrete prefabricated column has a third short angle steel with two limbs for connection, and the two limbs of the third short angle steel are respectively equipped with a third bolt hole, a friction bolt, and a fiber-reinforced cement-based composite Material;

The reinforced concrete prefabricated columns on the upper and lower floors are connected through the second short angle steel with friction bolts through the second reserved bolt holes;

The connection between the reinforced concrete precast beam and the reinforced concrete precast column is through the first short angle steel at the end of the reinforced concrete precast beam and the third short angle steel at the end of the reinforced concrete precast column with the short beam section passing through the first reserve with friction bolts The bolt holes are connected with the third reserved bolt holes, and then fiber-reinforced cement-based composite materials are poured in the connection area between the reinforced concrete prefabricated beam and the reinforced concrete prefabricated column, so that the structure becomes an assembled integral frame.

The present invention also provides a construction method of a reinforced concrete assembled monolithic frame connected by short angle steels, the method comprising the following steps:

Step 1: Carry out the overall analysis of the reinforced concrete assembly monolithic frame structure, determine the cross-sectional dimensions of reinforced concrete precast columns and precast beams, the strength grade of steel bars and the amount of steel bars, etc.; determine the segmentation of reinforced concrete precast columns and reinforced concrete precast beams: The segmentation point of the reinforced concrete prefabricated column is set in the middle of the floor, and the moment inversion point of the upper and lower floors is selected as the segmentation basis, and the prefabricated short beam section is attached. The segmentation point of the reinforced concrete prefabricated beam is set at the end of the beam. The distance is 1~2h from the prefabricated column edge, h is the height of the reinforced concrete prefabricated beam. The beam-column shear design at the beam and reinforced concrete prefabricated column section requires the determination of the specific size of the short angle steel;

Step 2: Make reinforced concrete precast columns and reinforced concrete precast beams; make reinforced concrete precast columns and reinforced concrete precast beams according to the above design requirements, where reinforced concrete precast columns have short beam sections, reinforced concrete precast columns at both ends and precast columns There is a short angle steel at the end of the attached short beam section, and bolt holes are reserved for connecting the short angle steel to facilitate high-strength bolt connection;

Step 3: Vertical connection of reinforced concrete precast columns; transport the prefabricated column sections to the construction site, first install the lower reinforced concrete precast columns, then hoist the upper reinforced concrete precast columns in place, and connect them with high-strength friction bolts The short angle steel at the end of the upper and lower columns, and then pouring fiber reinforced cement-based composite material in the connection area between the reinforced concrete columns, so that the columns become a whole;

Step 4: Connection of reinforced concrete precast beams and reinforced concrete precast columns; after the installation of reinforced concrete precast columns is completed, the reinforced concrete precast beams are hoisted in place horizontally, and are located at the same level as the short beam section attached to the reinforced concrete precast columns. High-strength friction bolts connect the short angle steel at the end of the reinforced concrete precast beam and the short angle steel with the short beam section attached to the precast column, and then pour fiber-reinforced cement-based composite materials in the connection area between the reinforced concrete precast beams to make the beam column a As a whole, complete the production of reinforced concrete assembly monolithic frame.

Beneficial effect: compared with the prior art, the present invention has the following advantages:

(1) Reinforced concrete prefabricated columns have short beam sections, and the beam-column joints are prefabricated as a whole, and the joints have good overall performance and seismic performance;

(2) Reinforced concrete prefabricated columns are connected by short angle steels at both ends and connected with high-strength friction bolts. The connection method is simple, the overall performance of the columns is high, and the construction operation is convenient;

(3) The short connecting angle steel is embedded at the end of the reinforced concrete prefabricated beam. After the prefabricated beam is hoisted in place, it can be connected with the short connecting angle steel at the end of the short beam section of the precast column through high-strength friction bolts. There is no need to use scaffolding to temporarily support the prefabricated beam, saving related costs , on the other hand, it can enhance the stiffness of the node end, make the plastic hinge area away from the node area, and improve the connection performance of the node;

(4) The beam-column connection area is poured with fiber-reinforced cement-based composite materials, which not only improves the crack development pattern in the connection area, avoids the cracking of the new and old concrete joint surfaces, but also greatly improves the seismic energy consumption capacity of the connection area, making the invention The reinforced concrete assembly monolith becomes a ductile frame with better seismic performance.

Description of drawings:

Figure 1 is a reinforced concrete assembled monolithic frame connected by short angle steel;

Fig. 2 is the short angle steel for connection;

Fig. 3 is the reinforced concrete prefabricated beam with short angle steel;

Figure 4 shows a reinforced concrete precast column with short beam sections.

1- Reinforced concrete prefabricated beams

2 - With short beam section

3- Reinforced concrete prefabricated column

4- The first short angle steel used for the connection of both ends of the reinforced concrete prefabricated beam

5-The first reserved bolt hole for the two ends of the reinforced concrete prefabricated beam connected with the short angle steel two limbs

6- The second short angle steel used for connecting the upper and lower ends of the reinforced concrete prefabricated column

7-The second reserved bolt hole for the connection of the upper and lower ends of the reinforced concrete prefabricated column with short angle steel two limbs

8-Reinforced concrete prefabricated column with third short angle steel for short beam connection

9-Reinforced concrete prefabricated column with short beam section connection with short angle steel two limbs third reserved bolt hole

10-Friction type bolt

11- Fiber Reinforced Cementitious Composites

Detailed ways:

The present invention will be further described below in conjunction with the accompanying drawings.

As shown in Figures 1-4, the reinforced concrete assembled monolithic frame connected by short angle steel provided by the present invention includes a reinforced concrete prefabricated beam 1, a reinforced concrete prefabricated column 3 with a short beam section 2,

The two ends of the reinforced concrete prefabricated beam 1 are respectively connected with the first short angle steel 4 provided with two limbs, the two limbs of the first short angle steel 4 have the first reserved bolt holes 5,

The upper and lower ends of the reinforced concrete prefabricated column 3 are respectively equipped with second short angle steel 6 for connection and has two limbs, and the two limbs of the second short angle steel 6 have second reserved bolt holes 7,

The attached short beam section 2 of the reinforced concrete prefabricated column 3 has a third short angle steel 8 for connection and has two limbs, and the two limbs of the third short angle steel 8 have a third bolt hole 9 and a friction bolt 10 respectively. , fiber reinforced cement-based composite material 11;

The reinforced concrete prefabricated columns 3 on the upper and lower floors are connected through the second short angle steel 6 and the friction bolt 10 through the second reserved bolt hole 7;

The connection between the reinforced concrete prefabricated beam 1 and the reinforced concrete prefabricated column 3 is through the first short angle steel 4 at the end of the reinforced concrete prefabricated beam 1 and the third short angle steel at the end of the reinforced concrete prefabricated column 3 with the short beam section 2 for 8 Friction-type bolts 10 are connected through the first reserved bolt hole 5 and the third reserved bolt hole 9, and then a fiber-reinforced cement-based composite material 11 is poured in the connection area between the reinforced concrete prefabricated beam 1 and the reinforced concrete prefabricated column 3, so that the structure Become an assembled monolithic frame.

Determine the size of the short angle steel for each connection according to the design requirements, and drill bolt holes on the short angle steel for connection according to the design requirements; produce reinforced concrete prefabricated columns 3 with short beam sections 2 on the production pedestal of the prefabricated factory, and reinforced concrete prefabricated columns 3 The short angle steel 6 for the connection at both ends and the short angle steel 8 for the connection at the end of the attached short beam section 2 should pay attention to the placement position, half of which is inside the prefabricated component, and half is outside the prefabricated component; steel bars are produced on the production platform of the prefabricated factory The concrete prefabricated beam 1 and the short angle steel 4 used for connecting the two ends of the reinforced concrete prefabricated beam 1 are half placed inside the prefabricated component and half placed outside the prefabricated component; the reinforced concrete prefabricated column 3 and the reinforced concrete prefabricated beam 1 are transported to the construction site for installation, Install the reinforced concrete prefabricated column 3 of the lower floor first, then hoist the reinforced concrete precast column 3 of the upper floor into place, connect the upper and lower reinforced concrete precast column 3 ends with short angle steel 6 with high-strength friction bolts 10, and then connect the upper and lower reinforced concrete precast columns 3 The fiber-reinforced cement-based composite material 11 is poured in the area, so that the reinforced concrete prefabricated columns 3 are integrated; after the reinforced concrete prefabricated columns 3 are installed, the reinforced concrete prefabricated beams 1 are horizontally hoisted in place, so that the reinforced concrete prefabricated beams 1 and steel bars Concrete prefabricated column 3 with short beam section 2 is located at the same level, use high-strength friction bolts 10 to connect the end of reinforced concrete prefabricated beam 1 and the connecting short angle steel of reinforced concrete precast column 3 with short beam section 2, and then connect the precast beam The fiber-reinforced cement-based composite material 11 is poured in the connection area, so that the reinforced concrete prefabricated beam 1 and the reinforced concrete prefabricated column 3 are integrated to complete the fabrication of the reinforced concrete assembled integral frame.

The invention provides a construction method for a reinforced concrete assembled monolithic frame connected by short angle steels, the method comprising the following steps:

Step 1: Carry out the overall analysis of the reinforced concrete assembly monolithic frame structure, determine the cross-sectional dimensions of reinforced concrete precast columns and precast beams, the strength grade of steel bars and the amount of steel bars, etc.; determine the segmentation of reinforced concrete precast columns and reinforced concrete precast beams: The segmentation point of the reinforced concrete prefabricated column is set in the middle of the floor, and the moment inversion point of the upper and lower floors is selected as the segmentation basis, and the prefabricated short beam section is attached. The segmentation point of the reinforced concrete prefabricated beam is set at the end of the beam. The distance is 1~2h from the prefabricated column edge, h is the height of the reinforced concrete prefabricated beam. The beam-column shear design at the beam and reinforced concrete prefabricated column section requires the determination of the specific size of the short angle steel;

Step 2: Make reinforced concrete precast columns and reinforced concrete precast beams; make reinforced concrete precast columns and reinforced concrete precast beams according to the above design requirements, where reinforced concrete precast columns have short beam sections, reinforced concrete precast columns at both ends and precast columns There is a short angle steel at the end of the attached short beam section, and bolt holes are reserved for connecting the short angle steel to facilitate high-strength bolt connection;

Step 3: Vertical connection of reinforced concrete precast columns; transport the prefabricated column sections to the construction site, first install the lower reinforced concrete precast columns, then hoist the upper reinforced concrete precast columns in place, and connect them with high-strength friction bolts The short angle steel at the end of the upper and lower columns, and then pouring fiber reinforced cement-based composite material in the connection area between the reinforced concrete columns, so that the columns become a whole;

Step 4: Connection of reinforced concrete precast beams and reinforced concrete precast columns; after the installation of reinforced concrete precast columns is completed, the reinforced concrete precast beams are hoisted in place horizontally, and are located at the same level as the short beam section attached to the reinforced concrete precast columns. High-strength friction bolts connect the short angle steel at the end of the reinforced concrete precast beam and the short angle steel with the short beam section attached to the precast column, and then pour fiber-reinforced cement-based composite materials in the connection area between the reinforced concrete precast beams to make the beam column a As a whole, complete the production of reinforced concrete assembly monolithic frame.

A construction method of a reinforced concrete assembled monolithic frame connected by short angle steels, the specific steps are as follows:

(1) Carry out the overall analysis of the reinforced concrete assembly monolithic frame structure, determine the cross-sectional dimensions, steel bar strength grades, and steel bar consumption of the reinforced concrete precast column 3 and the reinforced concrete precast beam 1; Segmentation situation: the segmentation point of the reinforced concrete precast column 3 is set in the middle of the floor, and the moment inversion point of the upper and lower floors is selected as the segmentation basis. The reinforced concrete precast column 3 is attached with the short beam section 2, and the length of the short beam section 2 is attached is h, h is the height of reinforced concrete precast beam 1, and the subsection point of reinforced concrete precast beam 1 is set at the end of the beam, generally 1~2h away from the 3 sides of reinforced concrete precast column, h is the height of reinforced concrete precast beam 1; After the concrete prefabricated column 3 and the reinforced concrete prefabricated beam 1 section are completed, the specific size of the short angle steel for connection is determined according to the shear design requirements of the reinforced concrete precast column 3 and the reinforced concrete prefabricated beam 1 section;

⑵Make short angle steel for connection; make short angle steel for connection according to design requirements, and reserve bolt holes at the ends of short angle steel for connection;

⑶ Manufacture reinforced concrete prefabricated column 3 and reinforced concrete precast beam 1; according to the above design requirements, manufacture pedestals in the prefabricated factory last year to manufacture reinforced concrete prefabricated column 3 and reinforced concrete prefabricated beam 1, wherein reinforced concrete prefabricated column 3 has a short beam section 2. The two ends of reinforced concrete precast column 3, the ends of reinforced concrete precast column 3 with short beam section 2 and the two ends of reinforced concrete precast beam 1 have short angle steel for connection, and the short angle steel for connection should be connected to the part with bolt holes placed outside the prefabricated components, and the rest placed inside the prefabricated components;

(4) Vertical connection of reinforced concrete prefabricated column 3; transport the completed reinforced concrete prefabricated column 3 to the installation site, first install the lower reinforced concrete precast column 3, then hoist the upper reinforced concrete prefabricated column 3 into place, and place The bolt holes of the short angle steel are used to connect the ends of the upper and lower prefabricated columns, and they are connected with high-strength friction bolts 10, and then fiber-reinforced cement-based composite materials 11 are poured in the connection area of the reinforced concrete precast columns 3, so that each reinforced concrete precast column 3 becomes one overall;

⑸ Horizontal connection of reinforced concrete precast beam 1 and reinforced concrete precast column 3; after the installation of reinforced concrete precast column 3 is completed, the reinforced concrete precast The short beam section 2 is located at the same level, and the end of the reinforced concrete precast beam 1 and the reinforced concrete precast column 3 are connected with the short angle steel attached to the short beam section 2 with high-strength friction bolts 10, and then fiber reinforced concrete is poured in the connection area of the precast beam The cement-based composite material 11 integrates the reinforced concrete prefabricated beam 1 and the reinforced concrete prefabricated column 3 to complete the fabrication of the reinforced concrete assembled integral frame.

Claims (2)

1. a steel concrete prefabricated integral frame for angle cleat connection, it is characterized in that, this framework comprises reinforced concrete prefabricated beam (1), the reinforced concrete prefabricated column (3) of subsidiary short beam section (2);

Two ends of reinforced concrete prefabricated beam (1) are connected with first angle cleat (4) of two points of limbs respectively, and the first angle cleat (4) two points of limb girdles have the first prepared screw-bolt hole (5);

Upper and lower two ends of reinforced concrete prefabricated column (3) are respectively with to connect with and with second angle cleat (6) of two points of limbs, the second angle cleat (6) two points limb girdle has the second prepared screw-bolt hole (7);

The subsidiary short beam section (2) of reinforced concrete prefabricated column (3) is with to connect with and with the 3rd angle cleat (8) of two points of limbs, the 3rd angle cleat (8) two points limb is respectively with the 3rd bolt hole (9), friction-type bolt (10), fiber reinforced cement-based composite material (11);

The reinforced concrete prefabricated column (3) of upper and lower floor is connected through the second prepared screw-bolt hole (7) by the second angle cleat (6) friction-type bolt (10);

Connection between reinforced concrete prefabricated beam (1) and reinforced concrete prefabricated column (3) is connected with the 3rd prepared screw-bolt hole (9) through the first prepared screw-bolt hole (5) with friction-type bolt (10) with (8) with the 3rd angle cleat of subsidiary short beam section (2) end of reinforced concrete prefabricated column (3) by first angle cleat (4) of reinforced concrete prefabricated beam (1) end, then built fiber reinforced cement-based composite material (11) at reinforced concrete prefabricated beam (1) and reinforced concrete prefabricated column (3) bonding pad, made structure become prefabricated integral frame.

2. a construction method for the steel concrete prefabricated integral frame of angle cleat connection, it is characterized in that, the method comprises the steps:

Step 1: the global analysis carrying out steel concrete prefabricated integral frame structure, determines the sectional dimension of reinforced concrete prefabricated column, precast beam, steel strength grade and amount of reinforcement etc.; Determine the segmentation situation of reinforced concrete prefabricated column, reinforced concrete prefabricated beam: the waypoint of reinforced concrete prefabricated column is arranged in the middle part of floor, choose the moment of flexure inflection point place of upper and lower floor as segmentation foundation, and subsidiary prefabricated short beam section, the waypoint of reinforced concrete prefabricated beam is arranged on the end of beam, distance is prefabricated post limit 1 ~ 2h, h is reinforced concrete prefabricated depth of beam, and the moment of flexure inflection point at foundation precast beam two ends is as segmentation foundation; After reinforced concrete prefabricated beam and reinforced concrete prefabricated column segmentation complete, the beam column shear Design according to reinforced concrete prefabricated beam and reinforced concrete prefabricated column segmentation place requires the concrete size determining angle cleat;

Step 2: make reinforced concrete prefabricated column and reinforced concrete prefabricated beam; Reinforced concrete prefabricated column and reinforced concrete prefabricated beam is made by designing requirement above, wherein reinforced concrete prefabricated column is with short beam section, reinforced concrete prefabricated column two ends and the subsidiary short beam section end of prefabricated post, with angle cleat, connect angle cleat prepared screw-bolt hole and facilitate high strength exploitation;

Step 3: the vertical connection of reinforced concrete prefabricated column; Prefabricated shell of column is transported to building-site, the reinforced concrete prefabricated column of bottom is first installed, then by upper reinforcement concrete prefabricated column hoisted in position, the angle cleat of upper and lower column end is connected with high strength friction-type bolt, then fiber reinforced cement-based composite material is built in the bonding pad between reinforced concrete post, makes post become as a whole;

Step 4: the connection of reinforced concrete prefabricated beam and reinforced concrete prefabricated column; After reinforced concrete prefabricated column installation, by horizontal for reinforced concrete prefabricated beam hoisted in position, same level absolute altitude place is positioned at the subsidiary short beam section of reinforced concrete prefabricated column, with the angle cleat of the concrete prefabricated beam end of high strength friction-type bolt connecting reinforcement and the angle cleat of the subsidiary short beam section of prefabricated post, then fiber reinforced cement-based composite material is built in the bonding pad between reinforced concrete prefabricated beam, make beam column become as a whole, complete the making of steel concrete prefabricated integral frame.