Connecting device for frame beam-column joints and construction method of connecting device

Abstract

The invention relates to the technical field of building structure engineering, and discloses a connecting device for frame beam-column joints and a construction method of the connecting device, the connecting device comprises a rod body, a limiting groove, a limiting block, a bolt sleeve and a split bolt, and the construction method comprises the following steps that the end of the rod body is hinged to a steel column; after the angle between the connecting device and the steel column is adjusted to the designed angle, the end of the split bolt is hinged to the steel beam; the hexagonal sleeve is rotated to drive the bolt sleeve, so that the split bolt is screwed into the bolt sleeve to apply pre-tightening force. According to the invention, through the hinged connecting device, the frame beam is changed into a continuous beam, so that the amplitude of the hogging moment of the beam-column joint is effectively reduced; and the connecting device can actively apply pre-tightening force, so that the negative moment peak value is remarkably reduced, the flexural capacity required by the beam is reduced, the use amount of steel required by the steel beam is remarkably reduced, the node economy is effectively improved, and the construction difficulty is also reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building structure engineering, and in particular to a connecting device for a frame beam-column joint and a construction method thereof. BACKGROUND

[0002] In a building structure, a frame connecting joint needs to bear vertical load and horizontal seismic action at the same time, and its mechanical performance directly determines the safety and economy of the overall structure.

[0003] In the design of a traditional composite beam-column joint, the concrete slab mainly bears compressive stress, and the concrete in the tensile zone is prone to cracking and exiting work, resulting in that the negative bending moment bearing capacity depends only on the bending resistance of the steel beam, and the difference between the positive bending moment bearing capacity and the negative bending moment bearing capacity of the joint is significant. Research shows that the positive bending moment bearing capacity of a conventional composite beam can be 1.5 times or more than the negative bending moment, and under the action of an earthquake, the negative bending moment of the joint increases sharply and becomes a design control factor.

[0004] Similarly, a steel frame beam-column joint also has similar problems. Under the action of vertical load, the beam-column joint bears a negative bending moment, and under the action of horizontal load, an additional negative bending moment is superimposed on the original negative bending moment, resulting in that the design value of the negative bending moment at the beam end of the beam-column joint is significantly higher than that of the positive bending moment, and therefore it is necessary to reduce the internal force amplitude of the negative bending moment at the beam end.

[0005] In the prior art, the bending resistance is usually enhanced by increasing the cross section of the steel beam or adding a stiffener plate, but the above-mentioned methods have the problems of large amount of steel and increased construction difficulty. SUMMARY

[0006] Based on the above problems, the purpose of the present application is to provide a connecting device for a frame beam-column joint and a construction method thereof to solve the problems existing in the prior art.

[0007] The present application adopts the following technical solutions:

[0008] The present application provides a connecting device for a frame beam-column joint, comprising:

[0009] A rod body is hingedly connected to a steel column at one end and movably penetrates into a limiting groove and is connected to a limiting block at the other end, and the rod body is movably limited in cooperation with the limiting block and the limiting groove;

[0010] A bolt sleeve is connected at the end away from the rod body with the limiting groove, a tension bolt is threadedly connected in the bolt sleeve, and the end of the tension bolt extends to the outside of the bolt sleeve and is hingedly connected to a steel beam.

[0011] Further, the protection sleeve is sleeved on the rod body, and the limiting groove extends into the protection sleeve and is movably connected with the protection sleeve on the side away from the bolt sleeve.

[0012] Further, the elastic member is arranged in the protection sleeve, one end of the elastic member abutting against the protection sleeve, and the other end abutting against the limiting groove.

[0013] Further, the rod body and the end part of the pair of tension bolts are respectively hinged on the steel column and the steel beam through the hinge support.

[0014] Further, the hinge support is connected with the steel column and the steel beam through high-strength bolts or welding.

[0015] Further, the threads of the bolt sleeve and the pair of tension bolts are one-way threads.

[0016] Further, the reserved thread length of the pair of tension bolts is greater than or equal to 50 mm.

[0017] Further, the outer wall of the bolt sleeve is sleeved with a hexagonal sleeve.

[0018] The application further provides a construction method of the connecting device of the frame beam-column joint, comprising the following steps:

[0019] S1, the end part of the rod body of the connecting device is hingedly connected with the steel column;

[0020] S2, after the angle between the connecting device and the steel column is adjusted to the design angle, the end part of the pair of tension bolts is hingedly connected with the steel beam;

[0021] S3, the hexagonal sleeve is rotated to drive the bolt sleeve, the pair of tension bolts are screwed into the bolt sleeve to apply the pre-tightening force.

[0022] Further, in step S3, the bolt sleeve is uniformly rotated, and the pre-tightening force is applied in three stages according to the design load, and the final pre-tightening force error is controlled within ±5%.

[0023] Compared with the prior art, the application has the beneficial technical effects:

[0024] By using a connecting device as a tie rod, it is equivalent to adding a support in the beam, making the frame beam a continuous beam, thereby effectively reducing the amplitude of the negative bending moment at the beam-column joint. By rotating the bolt sleeve, the tie bolt is screwed into the bolt sleeve, and a preload can be actively applied. This preload can generate a positive bending moment in advance, which can offset part of the negative bending moment at the beam end, significantly reducing the peak value of the negative bending moment. This reduces the required bending bearing capacity of the beam, thus significantly reducing the amount of steel required for the steel beam, effectively improving the economy of the joint, and also reducing the difficulty of construction. Attached Figure Description

[0025] The present invention will be further described below with reference to the accompanying drawings.

[0026] Fig. 1 This is a three-dimensional structural diagram of the connection device for frame beam-column joints of the present invention after installation.

[0027] Fig. 2 This is a partial perspective sectional view of the connection device for frame beam-column joints according to the present invention.

[0028] Explanation of reference numerals in the attached drawings: 1. Rod body; 2. Steel column; 3. Limiting groove; 4. Limiting block; 5. Bolt sleeve; 6. Tie bolt; 7. Steel beam; 8. Hinge support; 9. Protective sleeve; 10. Elastic element; 11. Hexagonal sleeve; 12. Concrete slab. Detailed Implementation

[0029] To make the technical problems, technical solutions, and beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0030] like Figs. 1-2 As shown, this embodiment discloses a connection device for a frame beam-column joint, including a rod 1, one end of which is hinged to a steel column 2, and the other end of which extends movably through a limiting groove 3 and is connected to a limiting block 4. The rod 1 is movably limited and engaged with the limiting groove 3 through the limiting block 4. The end of a bolt sleeve 5 is connected to the limiting groove 3 at the end away from the rod 1. A tie bolt 6 is threaded into the bolt sleeve 5, and the end of the tie bolt 6 extends to the outside of the bolt sleeve 5 and is hinged to a steel beam 7.

[0031] In this embodiment, the ends of the rod 1 and the tie bolt 6 are respectively hinged to the steel column 2 and the steel beam 7 via hinge supports 8. The hinge supports 8 are connected to the steel column 2 and the steel beam 7 by high-strength bolts or welding, preferably by high-strength bolts. The rod 1 and the limiting block 4 are rigidly connected. The limiting block 4 can move and rotate freely in the limiting groove 3. The inner wall of the limiting groove 3 is polished to reduce frictional resistance.

[0032] Specifically, the inner surface shape of the cross section of the limiting groove 3 is circular, the inner wall is polished to a surface roughness Ra≤12.5 μm, and the outer surface shape can be circular, oval or polygonal; the limiting block 4 is provided as a cylindrical block, the diameter of which is adapted to the inner diameter of the limiting groove 3; the end of the limiting groove 3 is inwardly tapered, and a certain thickness is required to ensure that the limiting block 4 and the limiting groove 3 do not separate when the component is under tension, and the tension can be normally transmitted.

[0033] With this scheme, the connecting device composed of the above structure, as a tension rod, is equivalent to adding a support in the beam, so that the frame beam becomes a continuous beam, thereby effectively reducing the amplitude of the negative bending moment of the beam-column joint; by rotating the bolt sleeve 5 and screwing the tension bolt 6 into the bolt sleeve 5, a pre-tightening force can be actively applied, and a positive bending moment can be generated in advance by the pre-tightening force, which can offset the negative bending moment at the beam end, significantly reduce the negative bending moment peak, and reduce the required bending resistance of the beam. The amount of steel required for the steel beam 7 will be significantly reduced, and the economy of the joint will be effectively improved.

[0034] Further optimization scheme also includes a protective sleeve 9, which is sleeved on the rod body 1, and the limiting groove 3 extends into the protective sleeve 9 on the side away from the bolt sleeve 5 and is movably connected with the protective sleeve 9.

[0035] In this embodiment, the end of the limiting groove 3 extending into the protective sleeve 9 can freely move and rotate in the protective sleeve 9; the protective sleeve 9 is fixedly connected with the rod body 1, when the connecting device is under pressure, the limiting block 4 slides in the limiting groove 3, and the limiting groove 3 slides in the protective sleeve 9, so that the connecting device only bears tension and does not bear pressure under the action of earthquake, avoiding instability and damage of the connecting device; at the same time, when the composite beam needs to be poured with concrete, the protective sleeve 9 can play a protective role, ensuring that the connecting device can normally stretch and contract.

[0036] Further optimization scheme also includes an elastic member 10, which is arranged in the protective sleeve 9, one end of which abuts against the protective sleeve 9, and the other end abuts against the limiting groove 3.

[0037] In this embodiment, the elastic member 10 can be a spring, which is sleeved on the outer periphery of the rod body 1, one end of the spring abuts against the inner wall of the protective sleeve 9, and the other end abuts against the end of the limiting groove 3 extending into the protective sleeve 9. The protective sleeve 9 and the rod body 1 can be fixedly connected or movably connected; when movably connected, the protective sleeve 9 needs to be wrapped and fixed by pouring concrete; when the connecting device is under pressure, the limiting block 4 slides in the limiting groove 3, and the limiting groove 3 compresses the spring, so that the end of the limiting groove 3 slides in the protective sleeve 9. As an optional embodiment, the elastic member 10 can be replaced by a soft material, which can be a foam board.

[0038] It is worth noting that when the combined beam construction needs to be poured with concrete, such as cast-in-place concrete wall, the soft material can be filled around the hinge support 8; through the filling of the soft material, the interior of the hinge support 8 can be effectively prevented from being filled with concrete, and the normal rotation requirement of the hinge support 8 is ensured.

[0039] When the wall in the combined beam is a filler wall, the protective sleeve 9 and the elastic member 10 can not be provided under the condition that the normal expansion of the connecting device is met.

[0040] Further optimization scheme, the threads of the bolt sleeve 5 and the tension bolt 6 are one-way threads.

[0041] In the embodiment, the thread structure only allows rotation in one direction, that is, only allows the tension bolt 6 to be screwed into the bolt sleeve 5, and cannot be withdrawn in the opposite direction. Through the setting of the one-way thread, it can be ensured that the tension bolt 6 will not rotate in the opposite direction after the pre-tightening force is applied, and the stability of the pre-tightening force is ensured. At the same time, the reserved thread length of the tension bolt 6 is ≥50mm, which can ensure the effective tensioning stroke to meet the pre-tightening force application requirement.

[0042] As an optional embodiment, the threads of the bolt sleeve 5 and the tension bolt 6 can also be ordinary threads, and after the pre-tightening force is applied, the two are fixed by welding to ensure that the tension bolt 6 will not rotate in the opposite direction.

[0043] Further optimization scheme, the outer wall of the bolt sleeve 5 is fixedly provided with a hexagonal sleeve 11, which facilitates the application of the pre-tightening force.

[0044] In the embodiment, the outer surface shape of the cross section of the bolt sleeve 5 can be circular, elliptical or polygonal, and is preferably circular, which facilitates the smooth screwing of the tension bolt 6. When the pre-tightening force is applied, the hexagonal sleeve 11 is rotated by the hydraulic torque wrench, which facilitates the rotation of the bolt sleeve 5.

[0045] It is worth noting that when the outer surface shape of the cross section of the bolt sleeve 5 is hexagonal, the hexagonal sleeve 11 can not be provided; when the pre-tightening force is applied, the bolt sleeve 5 can be directly rotated by the hydraulic torque wrench.

[0046] Further optimization scheme, the materials of the steel column 2, the steel beam 7, the rod body 1, the limiting groove 3, the limiting block 4, the bolt sleeve 5, the tension bolt 6, the protective sleeve 9, the spring, the hinge support 8 and the hexagonal sleeve 11 are Q235, Q345, Q390 or other high-strength steel materials, and the yield strength is ≥235MPa.

[0047] The cross-sectional shape of the steel beam 7 can be arranged as an I-shaped cross-section, a cross-shaped cross-section or a box-shaped cross-section, and can be formed by welding or rolling process, and no concrete slab 12 is arranged in the steel frame beam-column joint; the concrete slab 12 in the composite beam can be replaced by other composite material layers, such as a profiled steel sheet.

[0048] The cross-sectional shape of the steel column 2 can be arranged as an I-shaped cross-section, a circular cross-section, a square cross-section, a rectangular cross-section or a special-shaped cross-section, and can be a pure steel column 2 or a steel-concrete composite column.

[0049] It should be noted that the connecting device in the application can be symmetrically arranged on both sides of the steel column 2, and a plurality of connecting devices can be arranged on each side, and each connecting device forms a triangle with the steel column 2 and the steel beam 7 to meet different stress requirements; the application is suitable for joint connection of multi-story, high-rise steel structure and steel-concrete composite structure system.

[0050] When the connecting device of the application is symmetrically arranged on both sides of the steel column 2, under the action of an earthquake, the connecting devices hinged on both sides allow the joint to produce controllable rotation, and the limiting block 4 freely slides in the limiting groove 3; the limiting block 4 on the side with reduced negative bending moment slides towards the direction close to the bolt sleeve 5, and the connecting device automatically exits the work; the connecting device on the side with increased negative bending moment synchronously increases the tensile stress, realizes dynamic redistribution of the negative bending moment, significantly reduces the peak bending moment, effectively avoids brittle failure of the joint caused by stress concentration, and significantly improves the ductility of the joint compared with the traditional structure, that is, the seismic performance is effectively improved.

[0051] The embodiment also discloses a construction method of the connecting device for the frame beam-column joint.

[0052] S1, the end of the rod body 1 of the connecting device is hingedly connected with the steel column 2;

[0053] S2, after the angle between the connecting device and the steel column 2 is adjusted to the design angle, the end of the tension bolt 6 is hingedly connected with the steel beam 7;

[0054] S3, the bolt sleeve 5 is rotated by rotating the hexagonal sleeve 11, so that the tension bolt 6 is screwed into the bolt sleeve 5 to apply a pre-tightening force.

[0055] Specifically, the end of the rod body 1 is hingedly connected to the hinge support 8, and the hinge support 8 is fixed to the steel column 2 by high-strength bolts; the end of the tension bolt 6 is hingedly connected to another hinge support 8, and the hinge support 8 is fixed to the steel beam 7 by high-strength bolts.

[0056] In the embodiment, the prefabricated assembly parts replace the on-site welding process, significantly reducing the safety risk of high-altitude welding, avoiding the influence of human and environmental factors on the welding quality, at the same time, the standardized installation process significantly shortens the construction period, and the connecting device adopts the bolt connection mode, so that the efficiency of later maintenance and replacement is significantly improved.

[0057] Further optimization scheme, in step S3, rotate bolt sleeve 5 at a constant speed, and apply pre-tightening force according to three levels of design load, and the final pre-tightening force error is controlled within ±5%.

[0058] Specifically, when the pre-tightening force is loaded in stages, 5 minutes are needed to hold the load after each stage of loading is completed.

[0059] The above-described embodiments are only used to describe the preferred modes of the present application, and are not used to limit the scope of the present application, and various modifications and improvements to the technical solutions of the present application made by those skilled in the art without departing from the design spirit of the present application shall fall within the protection scope of the present application defined by the claims.

Claims

1. A connection device for frame beam-column joints, characterized in that: include: A rod (1) has one end hinged to a steel column (2) and the other end movably passing through a limiting groove (3) and connected to a limiting block (4). The rod (1) is movably limited and matched with the limiting groove (3) through the limiting block (4). Bolt sleeve (5), the end of the bolt sleeve (5) is connected to the limiting groove (3) at the end away from the rod body (1), and a tie bolt (6) is threaded in the bolt sleeve (5), the end of the tie bolt (6) extends to the outside of the bolt sleeve (5) and is hinged to the steel beam (7).

2. The connection device for frame beam-column joints according to claim 1, characterized in that: It also includes a protective sleeve (9), which is sleeved on the rod body (1), and the limiting groove (3) extends into the protective sleeve (9) on the side away from the bolt sleeve (5) and is movably connected to it.

3. The connection device for frame beam-column joints according to claim 2, characterized in that: It also includes an elastic element (10), which is disposed in the protective sleeve (9), with one end abutting against the protective sleeve (9) and the other end abutting against the limiting groove (3).

4. The connection device for frame beam-column joints according to claim 1, characterized in that: The ends of the rod (1) and the tie bolt (6) are respectively hinged to the steel column (2) and the steel beam (7) via hinge supports (8).

5. The connection device for frame beam-column joints according to claim 4, characterized in that: The hinge support (8) is connected to the steel column (2) and the steel beam (7) by high-strength bolts or welding.

6. The connection device for frame beam-column joints according to claim 1, characterized in that: The threads of the bolt sleeve (5) and the tie bolt (6) are both unidirectional threads.

7. The connection device for frame beam-column joints according to claim 6, characterized in that: The reserved thread length of the tie bolt (6) is ≥50mm.

8. The connection device for frame beam-column joints according to claim 1, characterized in that: The outer wall of the bolt sleeve (5) is fitted with a hexagonal sleeve (11).

9. A construction method for a connection device for a frame beam-column joint according to any one of claims 1-8, characterized in that: Includes the following steps: S1. Hinge the end of the rod (1) of the connecting device to the steel column (2); S2. After adjusting the angle between the connecting device and the steel column (2) to the design angle, the end of the tie bolt (6) is hinged to the steel beam (7); S3. Rotate the hexagonal sleeve (11) to drive the bolt sleeve (5), so that the tie bolt (6) is screwed into the bolt sleeve (5) to apply preload.

10. The construction method of the connection device for frame beam-column joints according to claim 9, characterized in that: In step S3, the bolt sleeve (5) is rotated at a constant speed, and the preload is applied in three levels according to the design load, with the final preload error controlled within ±5%.

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