CN110805205A - Anti-buckling device for longitudinal reinforcement in plastic hinge area of concrete structure - Google Patents

Abstract

The invention relates to the technical field of constructional engineering, and discloses a concrete structure plastic hinge area longitudinal bar buckling prevention device, which comprises a plurality of longitudinal bars and is characterized in that: each longitudinal rib is provided with a U-shaped rib, the longitudinal ribs and the U-shaped ribs form inscribed butt, a tensioning mechanism is connected between every two adjacent U-shaped ribs, each longitudinal rib is provided with a jacking mechanism in a butt mode, and a steel wire rope is connected between the jacking mechanism and the tensioning mechanism. According to the invention, the U-shaped ribs are in a tensioned state by utilizing the tensioning mechanism to form primary tensioning, and the U-shaped ribs can provide a force for resisting the longitudinal ribs, so that the effect of preventing the longitudinal ribs from buckling is achieved preliminarily; then, the longitudinal ribs are supported through a jacking mechanism, so that buckling is further prevented; because the steel wire rope is connected between the jacking mechanism and the tensioning mechanism, secondary tensioning is formed through the steel wire rope, and the effect of preventing buckling of the longitudinal ribs in the region is achieved, so that the ductility of the structure is improved, and the anti-seismic performance of the structure is enhanced.

Description

Anti-buckling device for longitudinal reinforcement in plastic hinge area of concrete structure

technical field

The invention relates to the technical field of construction engineering, in particular to an anti-buckling device for longitudinal bars in a plastic hinge area of a concrete structure.

Background technique

At present, the ductile seismic design theory is mainly used in the field of structural seismic resistance. When the structure is subjected to strong earthquake action, it is allowed to form plastic hinges that can dissipate seismic energy in a specific area. According to many earthquake damage phenomena of concrete structures and laboratory experiments, it is found that the longitudinal reinforcement in the plastic hinge area is prone to buckling instability, resulting in premature failure of the structure.

In order to solve the above problems, the Chinese patent (CN105587075A) discloses a buckling restraint structure of longitudinal reinforcement in the plastic hinge area of a reinforced concrete member, which includes ordinary longitudinal reinforcement, restraint sleeve, sealant, fixing screw, annular foam material, gap and Fixed collar. Ordinary longitudinal reinforcement is the longitudinal reinforcement in the reinforced concrete member that plays the main load-bearing or force-transmitting role. The restraining casing is a metal casing or a fiber-reinforced composite casing whose inner diameter is larger than the outer diameter of the ordinary longitudinal steel bar, and there is a gap between the inner wall of the restraining casing and the outer wall of the ordinary longitudinal steel bar. In this patent, the longitudinal reinforcement is restrained by installing the casing on the reinforcement, which can improve the ductility of the concrete structure and prevent the longitudinal reinforcement from buckling prematurely in the plastic hinge area, but it is difficult to install the casing on each longitudinal reinforcement.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an anti-buckling device for longitudinal bars in the plastic hinge area of a concrete structure, so as to solve the problems raised in the above-mentioned background art.

For achieving the above object, the technical scheme adopted in the present invention is as follows:

The anti-buckling device for longitudinal bars in the plastic hinge area of concrete structures includes several longitudinal bars, and U-shaped bars are arranged on each longitudinal bar. A top-pressing mechanism is arranged at each longitudinal rib, and a wire rope is connected between the top-pressing mechanism and the tensioning mechanism.

Compared with the prior art, the principle and beneficial effects of the present invention are as follows: the U-shaped rib is in a taut state by using the tensioning mechanism to form the first tension. Then, the longitudinal bars are supported by the top pressing mechanism to further prevent buckling; since there is a wire rope connected between the top pressing mechanism and the tensioning mechanism, a second tension will be formed through the wire rope to prevent the area from buckling. The effect of longitudinal reinforcement buckling, thereby improving the ductility of the structure and enhancing its seismic performance.

Further, the tensioning mechanism includes a tensioning plate, and the tensioning plate is provided with a tensioning column for fixing the U-shaped rib. The U-shaped rib is fixed on the tensioning column, and the U-shaped rib is tightened by the tensioning plate, so that the U-shaped rib can counteract the longitudinal reinforcement, thereby achieving the effect of preventing the longitudinal reinforcement from buckling.

Further, a support bar is fixedly connected between the two adjacent tension plates. The tension plate is supported by the support bar, which increases the stability of the tension plate, thereby indirectly improving the seismic performance of the device.

Further, the tensioning plate is provided with a chute for the tensioning column to slide, and the tensioning column is provided with a positioning block for position limit. By sliding the tensioning column in the chute, adjust the position of the tensioning column, so that the tensioning column can better tighten the U-shaped rib, so as to achieve the effect of preventing buckling; after adjusting the position of the tensioning column, use the positioning The block will fix the tension column to avoid its displacement in the chute and affect the stability.

Further, the positioning block and the tensioning column are connected by screw threads. The connection method has good stability and is easy to disassemble and assemble.

Further, the top pressing mechanism includes a top pressing plate, and the top pressing plate and the two adjacent tensioning plates are connected by a wire rope. The longitudinal reinforcement is supported by the top pressure plate to prevent it from buckling.

Further, a constraining sleeve is also included, the longitudinal ribs are distributed in the constraining sleeve and inscribed with the constraining sleeve, and the outer wall of the constraining sleeve abuts against the top pressing plate. Compared with the installation of restraint sleeves on each longitudinal bar in the prior art, the use of restraint sleeves to cover all the longitudinal bars, the operation is simpler, and the longitudinal bars are hooped by the restraint sleeve, which can achieve preliminary buckling prevention. Then, the longitudinal reinforcement is supported by the top pressure plate to strengthen the anti-buckling effect.

Further, the abutting surface of the top pressing plate and the constraining sleeve is arc-shaped, and the radius of the arc is equal to that of the constraining sleeve. The top pressure plate and the restraining sleeve can be better matched, and the effect of preventing the buckling of the longitudinal bars is improved.

Further, the center of the top pressing plate is aligned with the longitudinal rib. When supporting, the top pressure plate can be evenly stressed, so that the top pressure plate itself will be more stable during the supporting process.

Further, the thickness of the top pressing plate gradually decreases from the center to both ends. The center of the top plate is used as the main support, and the thickness of both ends is reduced, which can save the amount of material and space.

Description of drawings

FIG. 1 is a top-view structural schematic diagram of Embodiment 1 of the present invention;

FIG. 2 is a top-view structural schematic diagram of Embodiment 2 of the present invention;

FIG. 3 is an enlarged view of A in FIG. 2 .

Detailed ways

The following is further described in detail by specific embodiments:

The reference signs in the accompanying drawings include: longitudinal rib 1, restraining sleeve 2, U-shaped rib 3, tension plate 4, tension column 5, top pressure plate 6, wire rope 7, support bar 8, chute 9, positioning Block 10.

Embodiment 1 is basically as shown in accompanying drawing 1:

The anti-buckling device for longitudinal bars in the plastic hinge area of a concrete structure includes several longitudinal bars 1 and a restraining sleeve 2. In this embodiment, the number of longitudinal bars 1 is twelve, and the longitudinal bars 1 are evenly distributed in the restraining sleeve 2 and Inscribed with constraining sleeve 2. Each longitudinal rib 1 is provided with a U-shaped rib 3 , and the longitudinal rib 1 and the U-shaped rib 3 form an inscribed abutment.

A tensioning mechanism is connected between two adjacent U-shaped ribs 3 , and the tensioning mechanism includes an arc-shaped tensioning plate 4 . Each longitudinal rib 1 is provided with a top pressing mechanism, the top pressing mechanism includes a top pressing plate 6, the center of the top pressing plate 6 is aligned with the longitudinal rib 1, the thickness of the top pressing plate 6 gradually decreases from the middle to both ends, and the restraining sleeve 2 The outer wall is in contact with the top pressure plate 6 , and the side of the top pressure plate 6 in contact with the restraining sleeve 2 is arc-shaped, and the radius of the arc is equal to that of the restraining sleeve 2 . A wire rope 7 is fixedly connected between the top pressing plate 6 and the two adjacent tensioning plates 4 .

In specific implementation, one end of the longitudinal rib 1 is fixed on the construction site, and then the constraining sleeve 2 is sleeved outside the longitudinal rib 1, so that the longitudinal rib 1 and the constraining sleeve 2 are in incised contact. Put the U-shaped rib 3 on the longitudinal rib 1, and fix the two free ends of the U-shaped rib 3 on the tension column 5 of the tension plate 4, so that the U-shaped rib 3 is taut. Then install the top pressure plate 6 at the longitudinal rib 1 corresponding to the outer wall of the restraining sleeve 2. When installing, align the center of the top pressure plate 6 with the longitudinal rib 1, and make the top pressure plate 6 abut against the outer wall of the restraining sleeve 2. Then, the wire rope 7 is fixedly connected to the two adjacent tension plates 4 and the top pressure plate 6 . After the installation is completed, the construction can be installed and poured.

During earthquake resistance, the U-shaped rib 3 is in a taut state by using the tensioning mechanism to form the first tension. Then, the longitudinal bars 1 are supported by the top pressing mechanism to further prevent buckling; since the wire rope 7 is connected between the top pressing mechanism and the tensioning mechanism, the second tension will be formed by the wire rope 7 to prevent the longitudinal bars in this area. 1 The effect of buckling, thereby improving the ductility of the structure and enhancing its seismic performance.

The second embodiment is basically as shown in Figure 2 and Figure 3:

The difference between this embodiment and the first embodiment is that a support bar 8 is fixedly connected between two adjacent tensioning plates 4, and the fixed connection method can be welding, screw connection, or the like. The tensioning plate 4 is provided with a chute 9 for the tensioning column 5 to slide, and the tensioning column 5 is connected with a positioning block 10 for limiting the position through a thread.

The tensioning plate 4 is supported by the support bars 8 to increase the stability of the tensioning plate 4, thereby indirectly improving the seismic performance of the device. During installation, by sliding the tensioning column 5 in the chute 9, the position of the tensioning column 5 is adjusted, so that the tensioning column 5 can better tighten the U-shaped rib 3, thereby achieving the effect of preventing buckling. After adjusting the position of the tensioning column 5, use the positioning block 10 to fix the tensioning column 5. The specific operation is: rotate the positioning block 10 to make it close to the tensioning plate 4, and finally press against the tensioning plate 4, Thus, the tensioning column 5 is locked at a specific position, so as to avoid the tensioning column 5 from being displaced in the chute 9 and affecting the stability of the whole device.

The above descriptions are only embodiments of the present invention, and common knowledge such as well-known specific structures and characteristics in the solution are not described too much here. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention. These should also be regarded as the protection scope of the present invention, and these will not affect the effect of the present invention and the practicability of the patent. The scope of protection claimed in this application shall be based on the content of the claims, and the descriptions of the specific implementation manners in the description can be used to interpret the content of the claims.

Claims (10)

1. Concrete structure plasticity hinge district is indulged muscle buckling restrained device, including a plurality of muscle of indulging, its characterized in that: each longitudinal rib is provided with a U-shaped rib, the longitudinal ribs and the U-shaped ribs form inscribed butt, a tensioning mechanism is connected between every two adjacent U-shaped ribs, each longitudinal rib is provided with a jacking mechanism in a butt mode, and a steel wire rope is connected between the jacking mechanism and the tensioning mechanism.

2. The concrete structure plastic hinge area longitudinal bar buckling restrained device according to claim 1, characterized in that: the tensioning mechanism comprises a tensioning plate, and a tensioning column for fixing the U-shaped rib is arranged on the tensioning plate.

3. The concrete structure plastic hinge area longitudinal bar buckling restrained device according to claim 2, characterized in that: and a supporting strip is fixedly connected between every two adjacent tensioning plates.

4. The concrete structure plastic hinge area longitudinal bar buckling restrained device according to claim 2 or 3, characterized in that: the tensioning plate is provided with a sliding groove for sliding the tensioning column, and the tensioning column is provided with a positioning block for limiting.

5. The concrete structure plastic hinge area longitudinal bar buckling restrained device according to claim 4, characterized in that: the positioning block is connected with the tensioning column through threads.

6. The concrete structure plastic hinge area longitudinal bar buckling restrained device according to claim 5, characterized in that: the jacking mechanism comprises a jacking plate, and the jacking plate is connected with the two adjacent tensioning plates through a steel wire rope.

7. The concrete structure plastic hinge area longitudinal bar buckling restrained device according to claim 6, characterized in that: the vertical ribs are distributed in the constraint sleeve and internally tangent to the constraint sleeve, and the outer wall of the constraint sleeve is abutted to the top pressure plate.

8. The concrete structure plastic hinge area longitudinal bar buckling restrained device according to claim 7, characterized in that: the top pressure plate is arc-shaped on one surface abutted to the restraint sleeve, and the radius of the arc is equal to that of the restraint sleeve.

9. The concrete structure plastic hinge area longitudinal bar buckling restrained device according to claim 8, characterized in that: the center of the top pressure plate is aligned with the longitudinal rib.

10. The concrete structure plastic hinge area longitudinal bar buckling restrained device according to claim 9, characterized in that: the thickness of the top pressing plate is gradually reduced from the center to two ends.

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