H-beam column node bolt replacement method and jacking device

Abstract

The present invention relates to the technical field of structural reinforcement, and particularly to a method for replacing bolts at the H-shaped steel beam-column joint and a jacking device. A method for replacing bolts at the H-shaped steel beam-column joint includes: S1. Applying a preset jacking force F to the part of the H-shaped steel beam between the bolt and the load, so that the bending moment value at the location of the bolt on the H-shaped steel beam is zero; S2. Removing the bolt. The method for replacing bolts at the H-shaped steel beam-column joint according to the present invention makes the bending moment value at the location where the bolt is before unloading in a relatively small state by applying a jacking force to the H-shaped steel beam between the bolt and the load, thereby preventing the flange weld at the splicing part of the H-shaped steel beam from cracking. At this time, the shear force value at the location of the bolt is relatively small, which is convenient for replacing the bolt. This method can improve the efficiency of replacing bolts at the H-shaped steel beam-column joint, and well solves the problem that the existing method cannot effectively replace the bolts at the H-shaped steel beam-column joint, and is suitable for use by reinforcement design units or reinforcement construction units.

Description

Technical Field

[0001] The invention relates to the technical field of structural reinforcement, and in particular to a method for replacing bolts at an H-shaped steel beam-column node and a jacking device. Background Art

[0002] In recent years, it has been found in the reinforcement and renovation of industrial plants that due to the harsh industrial environment, high-strength bolts and web connection plates at the splicing parts of H-shaped steel beam-column nodes are generally corroded, delaminated, and bolts loosened, which greatly reduces the bearing capacity of the nodes and may cause safety accidents in serious cases. High-strength bolts and web connection plates are severely corroded and have low reuse value. Reinforcement plans generally require replacement, but since the frame beams are supported by grid plates or equipment, they cannot be unloaded. Therefore, it is very necessary to find a device and method for quickly replacing high-strength bolts at H-shaped steel beam-column nodes. Summary of the invention

[0003] The purpose of the present invention is to overcome the problem of difficulty in replacing the splicing parts of H-shaped steel beam-column nodes in the prior art, and to provide a method for replacing bolts at H-shaped steel beam-column nodes, which reduces the bending moment at the bolts and facilitates the removal and installation of the bolts.

[0004] In order to achieve the above object, the present invention provides a method for replacing bolts at an H-shaped steel beam-column node, comprising:

[0005] S1. Apply a preset lifting force F to the portion of the H-shaped steel beam between the bolt and the load, so that the bending moment value at the location of the bolt on the H-shaped steel beam is zero;

[0006] S2. Remove the bolts.

[0007] Preferably, there are multiple bolts, and before removing the i-th bolt, the preset lifting force F is adjusted so that the bending moment value at the i-th bolt is zero, where i is a natural number greater than or equal to 1.

[0008] Preferably, before step S1, the detachable load is unloaded.

[0009] Preferably, the preset lifting force F is obtained through simulation, or the preset lifting force F is obtained through experimental simulation.

[0010] A second aspect of the present invention provides a jacking device, which is used in the H-beam beam-column node bolt replacement method of the present invention to provide a preset jacking force F. The jacking device includes a jack arranged on a support body, and a pressure sensor is clamped between the jack and the H-beam.

[0011] Preferably, it comprises a U-shaped groove sleeved on the H-shaped steel beam, and the pressure sensor is arranged on the inner bottom wall of the U-shaped groove, so that the jack presses the pressure sensor against the H-shaped steel beam through the U-shaped groove.

[0012] Preferably, the two side supports of the U-shaped groove are connected by a double-headed screw and adjustment nuts arranged at both ends of the double-headed screw.

[0013] Preferably, the support body is an H-shaped steel column close to one side of the jacking device, a connecting plate is provided on the H-shaped steel column, a supporting leg is transversely provided on one side of the connecting plate, and the jack is provided on the supporting leg.

[0014] Preferably, a stiffening rib is provided between the connecting plate and the supporting leg.

[0015] Preferably, a display screen for displaying the readings of the pressure sensor is provided on the U-shaped groove.

[0016] The method for replacing bolts at H-beam-column nodes described in the present invention applies a lifting force to the H-beam between the bolts and the load to keep the bending moment value at the bolt location before unloading in a small state, thereby preventing the flange weld at the splicing part of the H-beam from cracking. At this time, the shear force value at the bolt location is relatively small, which facilitates the replacement of the bolts. The method can improve the efficiency of replacing bolts at H-beam-column nodes, and well solves the problem that the existing methods cannot effectively replace the bolts at the H-beam-column nodes. The method is suitable for use by reinforcement design units or reinforcement construction units. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a jacking device according to an embodiment of the present invention;

[0018] Figure 2 yes Figure 1 Schematic diagram of the structure of the part shown;

[0019] Figure 3 This is a schematic diagram of the bending moment of the H-shaped steel beam column during normal use;

[0020] Figure 4 It is a schematic diagram of the bending moment when the jacking force is applied to the H-beam;

[0021] Figure 5 It is a schematic diagram of the bending moment after the web connection plate is unloaded;

[0022] Figure 6 This is a shear force diagram of the H-shaped steel beam column during normal use;

[0023] Figure 7 It is a schematic diagram of shear force when jacking force is applied to the H-beam;

[0024] Figure 8It is a schematic diagram of the shear force after the web connecting plate is unloaded.

[0025] Description of Reference Numerals

[0026] 1-H-shaped steel column, 2-H-shaped steel beam, 3-web connecting plate, 4-bolt, 5-U-shaped groove, 6-double-headed screw, 7-pressure sensor, 8-display screen, 9-jack, 10-piston support, 11-leg, 12-first stiffening rib, 13-second stiffening rib, 14-first connecting plate, 15-second connecting plate, 16-fixed connecting parts. DETAILED DESCRIPTION

[0027] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0028] In the present invention, unless otherwise specified, directional words such as "up, down, left, right" generally refer to up, down, left, right shown in the reference drawings; "inside, outside" generally refer to inside and outside relative to the outline of each component itself; "far, near" generally refer to far or near relative to the outline of each component itself.

[0029] In one aspect, the present invention provides a method for replacing bolts at an H-shaped steel beam-column node, comprising:

[0030] S1. Apply a preset lifting force F to the portion of the H-shaped steel beam 2 between the bolt 4 and the load, so that the bending moment value at the location of the bolt 4 on the H-shaped steel beam 2 is zero;

[0031] S2. Remove the bolt 4.

[0032] The method for replacing bolts at H-beam-column nodes of the present invention applies a jacking force to the H-beam between the bolt and the load to make the bending moment value at the location of the bolt in a smaller state before unloading, thereby preventing the flange weld at the splicing part of the H-beam from cracking. At this time, the shear force value at the location of the bolt is relatively small, which is convenient for replacing the bolt. This method can improve the efficiency of replacing bolts at H-beam-column nodes, and well solves the problem that the existing method cannot effectively replace the bolts at the H-beam-column node. It is suitable for use by reinforcement design units or reinforcement construction units. Preferably, the place where the jacking force F is applied is close to the location of the bolt, so as to achieve the purpose of achieving the purpose of making the bending moment value at the location of the bolt in a smaller state before unloading, and preventing the flange weld at the splicing part of the H-beam from cracking.

[0033] Preferably, there are multiple bolts 4, and before removing the i-th bolt 4, the preset lifting force F is adjusted so that the bending moment value at the i-th bolt 4 is zero, where i is a natural number greater than or equal to 1. Generally, there are many bolts at the H-beam-column node, and each time a bolt is unloaded, the internal force at the bolt connection is redistributed, so each time a bolt is unloaded, the lifting force is readjusted so that the bending moment value and shear force value at the bolt location are always at a smaller value, thereby preventing the flange weld at the splicing part of the H-beam from cracking and facilitating the removal and installation of the bolts.

[0034] Preferably, before step S1, the detachable load is unloaded. Since the H-beam supports detachable and non-detachable grid plates or equipment, the detachable load is unloaded as much as possible, and the non-detachable load is retained to reduce the pressure of the H-beam and facilitate the replacement of the bolts.

[0035] Preferably, the preset lifting force F is obtained by simulation, or the preset lifting force F is obtained by experimental simulation. The simulation process is as follows: calculate the specific value P of the load that cannot be unloaded; establish a simplified calculation model according to the actual load P and boundary conditions of the H-shaped steel beam, and make the following Figure 3 and Figure 6 The bending moment diagram and shear force diagram of the H-beam are shown in the figure. A lifting force F is added to the end of the bolt near the load P, as shown in the figure. Figure 4 and Figure 7 As shown, the bending moment value at the bolt location is 0. At this time, it can be ensured that after the bolt is removed, the lower flange weld of the H-beam will not be damaged by bending. After the position where the jacking force F is applied is determined, the specific value of the jacking force F can be calculated. 1 If there are two simulation bolts, after removing the first bolt, the bending moment value of the H-beam is redistributed. In order to make the bending moment value at the bolt location smaller when removing the second bolt, the lifting force is readjusted to a specific value F. 2 , obtained from simulation 2 The specific value of .

[0036] In the experimental simulation process, the specific value P of the load that cannot be unloaded is calculated; according to the actual load P on the H-beam and the boundary conditions, the actual model of the H-beam column node is established, and the following is made after calculation. Figure 3 and Figure 6 The bending moment diagram and shear force diagram of the H-beam are shown in the figure. A lifting force F is added to the end of the bolt near the load P, as shown in the figure. Figure 4 and Figure 7 As shown, the bending moment value at the bolt position is 0; after the position where the lifting force F is applied is determined, the specific value of the lifting force F can be calculated. 1After removing the first bolt, the bending moment of the H-beam is redistributed. In order to reduce the bending moment at the bolt location when removing the second bolt, the lifting force is readjusted to a specific value F. 2 , obtained from experimental simulation 2 In the experimental simulation, the required lifting force value can be obtained based on the position change of the simulated H-beam.

[0037] In the actual operation of removing the two bolts, the lifting force is applied to the corresponding position of the simulation or experimental simulation according to the operation steps, and F is applied. 1 , then remove the first bolt and apply F 2 , remove the second bolt. Remove the old web connecting plate 3, and install the new web connecting plate 3 using the new bolt.

[0038] The second aspect of the present invention provides a jacking device, which is used in the H-beam column node bolt replacement method of the present invention to provide a preset jacking force F, and the jacking device includes a jack 9 arranged on a support body, and a pressure sensor 7 is sandwiched between the jack 9 and the H-beam 2. The jack 9 is used to apply the jacking force F, and the pressure sensor 7 is used to detect the specific value of the jacking force F.

[0039] Preferably, a U-shaped groove 5 is sleeved on the H-shaped steel beam 2, and the pressure sensor 7 is arranged on the inner bottom wall of the U-shaped groove 5, so that the jack 9 pushes the pressure sensor 7 against the H-shaped steel beam 2 through the U-shaped groove 5. The U-shaped groove 5 prevents the piston support 10 of the jack 9 from directly contacting the H-shaped steel beam 2 to cause pressure loss to the H-shaped steel beam 2, and is used to place the pressure sensor 7.

[0040] Preferably, the two side supports of the U-shaped groove 5 are connected by stud screws 6 and adjusting nuts arranged at both ends of the stud screws 6. The stud screws 6 press the two side supports of the U-shaped groove 5, so that the two side supports of the U-shaped groove 5 clamp the H-shaped steel beam 2 to prevent the U-shaped groove 5 and the H-shaped steel beam 2 from moving relative to each other in the lateral direction, thereby improving the stability of the jacking device and the replacement efficiency of the bolts.

[0041] Preferably, the support body is an H-shaped steel column 1 close to one side of the jacking device, a connecting plate is provided on the H-shaped steel column 1, a supporting leg 11 is transversely provided on one side of the connecting plate, and the jack 9 is provided on the supporting leg 11. In actual construction scenarios, the H-shaped steel beam is generally far away from the ground or other positions that can support the jack. Placing the jack in the H-shaped steel column can use existing supportable objects to support the jack, thereby improving the practicality of the jacking device; Figure 1 and Figure 2As shown, the connecting plate includes a first connecting plate 14 and a second connecting plate 15, the two connecting plates clamp the flanges of the H-shaped H-shaped steel column and are fixed together by a fixing connector 16; the supporting leg 11 is configured as an H-shaped steel beam column, and the H-shaped steel beam column is horizontally arranged on the connecting plate.

[0042] Preferably, a stiffening rib is provided between the connecting plate and the supporting leg 11. A second stiffening rib 13 is provided between the supporting leg 11 and the connecting plate to strengthen the connection strength, which is beneficial to improving the connection strength between the connecting plate and the supporting leg 11; preferably, the H-shaped steel beam column itself is provided with a first stiffening rib 12 to strengthen its own strength. The second stiffening rib 13 and the first stiffening rib 12 improve the stability of the installation of the jacking device and improve the efficiency of bolt removal.

[0043] Preferably, a display screen 8 for displaying the reading of the pressure sensor 7 is provided on the U-shaped groove 5. The display screen 8 is used to visually observe the reading of the pressure sensor 7, i.e., the lifting force F, so as to facilitate real-time control of the jack 9 to provide the required lifting force F, thereby improving the practicality of the lifting device.

[0044] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications. Including the combination of various specific technical features in any suitable manner. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations. However, these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A method for replacing bolts at H-shaped steel beam-column nodes. It is characterized in that include: S1. Applying a preset lifting force F to the portion of the H-shaped steel beam (2) between the bolt (4) and the load, so that the bending moment value at the location of the bolt (4) on the H-shaped steel beam (2) is zero; S2, removing the bolt (4); The lifting force applied to the H-shaped steel beam (2) is detected by a pressure sensor (7), there are a plurality of bolts (4), and before removing the i-th bolt (4), the preset lifting force F is adjusted so that the bending moment value at the location of the i-th bolt (4) is zero, where i is a natural number greater than or equal to 1.

2. The method for replacing H-beam-column node bolts according to claim 1, It is characterized in that Before step S1, the detachable load is unloaded.

3. The method for replacing H-beam-column node bolts according to claim 1, It is characterized in that The preset lifting force F is obtained through simulation, or the preset lifting force F is obtained through experimental simulation.

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