An ancient building column base displacement constraint device and method

Abstract

The present invention discloses an ancient building column base displacement restraint device and method, including an ancient building wooden column. The ancient building wooden column is arranged on the foundation through a connecting steel plate. A shape memory alloy short column is arranged between the connecting steel plate and the foundation. A plurality of rubber rings are arranged on the surface of the connecting steel plate and along the bottom of the ancient building wooden column. The rubber rings are used to limit the lateral movement of the ancient building wooden column. Firstly, the device resists the lateral force transmitted from the column base through the deformation of the rubber rings. Secondly, the friction between the rubber rings generates a resisting bending moment. Finally, the shape memory alloy short column provides a self-resetting ability to help the column base better return to its original position, enabling the wooden frame where the column base is located to dissipate seismic energy, allowing the column to dissipate energy in multiple directions when swinging, and reducing the seismic damage of the column base. This damper has the characteristics of low maintenance cost and simple construction.

Description

Technical Field

[0001] The present invention relates to the technical field of ancient building structure reinforcement, and particularly relates to an ancient building column foot displacement constraint device and method. Background Art

[0002] In ancient Chinese timber structure buildings, columns, as the most important load-bearing components, are extremely vulnerable to natural damages such as ground moisture erosion, insect infestation, and light aging. After being damaged, the bearing capacity and stability of wooden columns will be greatly affected. Therefore, it is very important to reinforce the wooden columns of ancient buildings.

[0003] In ancient building timber structures, wooden columns are directly placed flat on the foundation stones to form column foot joints connecting the upper structure and the foundation. Under the action of repeated loads, the column feet repeatedly lift and return, causing the wooden columns to swing. The wooden columns will rotate along the edge of the column feet, generating a restoring moment, with semi-rigid characteristics. Therefore, the column frame can be simplified into a "swinging column" with a certain lateral resistance. Research shows that when the lateral deformation of the column frame is very small, the resistance generated by the column frame is beneficial to the structure. However, when the deformation angle of the column frame exceeds the width-to-height ratio of the column, the resistance generated by the column frame is unfavorable to the structure, and large angles may even lead to the collapse of the structure. Therefore, the restriction of displacement at the column feet plays an important role in the restoring moment and structural performance of the timber structure.

[0004] In some current wooden column reinforcement schemes, there are mainly butt joint, rib embedding reinforcement, and cross-sectional area increasing reinforcement, etc. These construction processes are relatively complex, and some even cannot improve the mechanical properties of the original columns, and will weaken the overall performance of the original structure.

[0005] At present, the specific practices of these reinforcements are mostly to cut off part of the cross-section of the original wooden column, place the column on a steel column, and then tighten steel plates and steel strips at the joints to increase the stiffness of the column. Although these methods directly change the lateral resistance of the wooden column, when reinforcing and protecting ancient buildings, the principle of not damaging the original components of ancient buildings should be adhered to, and the original columns should be retained to protect their historical value.

[0006] In summary, how to improve the working performance and maintainability of wooden columns and achieve better economic effects is a technical problem that needs to be solved by those skilled in the art at present. Summary of the Invention

[0007] In order to overcome the defects of the above-mentioned existing technologies, the purpose of the present invention is to provide an ancient building column foot displacement constraint device and method, which can improve the anti-overturning ability of the column feet, increase the overall stiffness and stability, and is beneficial to shock absorption and energy dissipation.

[0008] In order to achieve the above purpose, the technical solution adopted by the present invention is:

[0009] An ancient building column base displacement restraint device includes a horizontal connecting steel plate 4. A number of shape memory alloy short columns 5 are connected to the bottom surface of the connecting steel plate 4. The shape memory alloy short columns 5 are configured to support between the connecting steel plate 4 and the foundation 6. The ancient building wooden column 1 passes through the connecting steel plate 4 and is arranged on the foundation 6. A number of rubber rings 2 are arranged on the top surface of the connecting steel plate 4. The axial direction of the rubber rings 2 is horizontal. Each rubber ring 2 surrounds the ancient building wooden column 1 to limit the lateral movement of the ancient building wooden column 1.

[0010] L-shaped steel plates 3 are arranged at both ends of each rubber ring 2. The vertical plate of the L-shaped steel plate 3 contacts the end surface of the rubber ring 2, and the horizontal plate of the L-shaped steel plate 3 is fixed on the top surface of the connecting steel plate 4.

[0011] The rubber ring 2 does not contact the top surface of the connecting steel plate 4. The height difference between the two should ensure that the rubber ring 2 can rotate freely to avoid chemical reactions between the rubber ring 2 and the connecting steel plate 4 in the atmospheric environment. The device itself has transmitted the extrusion force of the column base through the L-shaped steel plate 3. There is no need to add an unclear force transmission path.

[0012] The rubber ring 2 includes an isoprene rubber inner ring 21 and a styrene-butadiene rubber outer ring 22. The rubber ring 2 is connected with a rubber ring connecting screw 7. The length of the rubber ring 2 can be determined according to the specific dimensions of the ancient building wooden column 1 to be reinforced.

[0013] The isoprene rubber inner ring 21 and the styrene-butadiene rubber outer ring 22 are processed once in the factory. According to the rubber ring production standard, the gap between the two rings is ensured not to exceed 1 mm. If the gap is not controlled, it will cause the rubber ring connecting screw 7 to be easily corroded and broken, affecting the seismic resistance of the reinforcement device.

[0014] The isoprene rubber inner ring 21 and the styrene-butadiene rubber outer ring 22 are in close contact. Friction can be generated when the two rubbers rotate. The rubber ring connecting screw 7 is wrapped inside the rubber ring 2. The contact between the inside of the rubber and oxygen and rainwater is reduced, enhancing its durability.

[0015] The L-shaped steel plate 3 and the connecting steel plate 4 are connected by a shaped steel plate connecting bolt 8 and welding. The connecting bolt 8 is selected as a high-strength bolt. After fixing the L-shaped steel plate 3 with the bolt, the bottom of the L-shaped steel plate 3 is welded to the top surface of the connecting steel plate 4 by fillet welding on three sides.

[0016] The bolt holes inside the connecting steel plate 4 are divided into two types, one is connected with the shaped steel plate connecting bolt 8 and the other is connected with the short column screw 9. On the premise of meeting the dimensions of other components, the distance between these two types of holes needs to be greater than the shortest distance required by the steel structure design standard "GB5 \alpha17-2017" to avoid shear failure of the bolt holes.

[0017] The shape memory alloy short column 5 is connected to the connecting steel plate using the short column screw 9. The shape memory alloy short column 5 and the rubber ring 2 should be arranged at the top corners of the connecting steel plate 4.

[0018] A method for using an ancient building column base displacement constraint device includes the following steps;

[0019] When the ancient building wooden column 1 tilts and undergoes rotation, the ancient building wooden column 1 squeezes the rubber ring 2 at the column base. After the rubber ring 2 is squeezed and deformed, it will drive the connecting steel plate 4 to tilt in the horizontal direction through the profiled steel plate connecting bolt 8. At this time, the connecting steel plate 4 will stretch the shape memory alloy short column 5 through the short column screw 9, mainly stretching the shape memory alloy short column 5 in the diagonal direction of the squeezed rubber ring 2, causing it to deform in the vertical direction. Subsequently, the shape memory alloy short column 5 will exert its superelastic performance, provide a self-resetting force, restore its initial original state, and drive the entire connecting steel plate 4 and the framework connected to it to return to the horizontal position, providing a moment resistance for the column base;

[0020] Under minor earthquakes, the column base of the ancient building wooden column 1 undergoes small displacements. At this time, the reinforcement device only relies on the squeezing deformation of the rubber ring 2 to resist the moment. The squeezing deformation is within the elastic stage of the inner circle 21 of the isoprene rubber. When the external force continues to increase, the rubber ring 2 can not only provide the resistance of the inner circle 21 of the isoprene rubber, but also provide the frictional force generated by the relative displacement between the inner circle 21 of the isoprene rubber and the outer circle 22 of the styrene-butadiene rubber due to different hardnesses. In summary, it can achieve no damage under minor earthquakes;

[0021] During moderate earthquakes, the rubber ring 2 pulls the connecting steel plate 4, and the connecting steel plate 4 in turn stretches the shape memory alloy short column 5. The strain corresponding to the superelastic strain of the shape memory alloy short column 5 is 6% - 8%. Within the displacement corresponding to this strain, the deformation can return to its original position, achieving repairability under moderate earthquakes;

[0022] During major earthquakes, the shape memory alloy short column 5 diagonally opposite to the squeezed rubber ring 2 can no longer resist the external force. However, at this time, the remaining shape memory alloy short columns 5 will continue to provide moment resistance for the column base of the ancient building wooden column 1, thus achieving the goal of not collapsing during major earthquakes.

[0023] Reinforce the diameter D of the wooden column 1 of the ancient building, fabricate a connecting steel plate 4 with a side length of 2D, the inner square side length of the connecting steel plate 4 is 1.25D, the rubber ring 2 should be arranged within a range of 3 - 5 mm from the wooden column 1 of the ancient building, and the L-shaped steel plate 3 is determined according to the position of the rubber ring 2 and welded. The center line of the L-shaped steel plate 3 should be on the same straight line as the center line of the rubber ring 2. Determine the position of the connecting bolt 8 of the steel plate at the center of the ear plate of the L-shaped steel plate 3. The connection between the center of the short column screw 9 of the shape memory alloy short column 5 and the center of the circle of the wooden column 1 of the ancient building should be perpendicular to the rubber ring 2. The straight-line distance between the holes of the short column screw 9 and the holes of the connecting bolt 8 of the steel plate should be greater than the minimum distance required by the steel structure design standard "GB50017 - 2017".

[0024] Advantages of the present invention:

[0025] By setting the rubber ring to restrict the displacement of the column foot of the wooden column, the wooden column of the ancient building is protected from damage, and the wooden column still remains intact after the removal of the limiting device. In the work of seismic energy dissipation within the rubber ring, in addition to resisting the lateral force of the column foot, the frictional force generated by the sliding between the double rings can also be used to resist the bending moment of the column foot. The shape memory alloy short column can provide vertical self-centering ability to ensure that the lateral displacement of the column foot is within a small range. The deformation of the column foot of the wooden column is reduced through the superelastic characteristics of the shape memory alloy short column and the energy dissipation ability of the rubber ring. After the earthquake, each component can be replaced, reducing the maintenance time cost and having high maintainability. Description of the drawings

[0026] Figure 1 It is a schematic structural diagram of a displacement constraint device for the column foot of an ancient building according to an embodiment of the present invention.

[0027] Figure 2 It is a detailed view of a displacement constraint device for the column foot of an ancient building according to an embodiment of the present invention.

[0028] Figure 3 It is a top view of a displacement constraint device for the column foot of an ancient building according to an embodiment of the present invention.

[0029] Figure 4 It is a schematic structural diagram of the rubber ring according to an embodiment of the present invention.

[0030] Figure 5 It is a schematic structural diagram of the L-shaped steel plate according to an embodiment of the present invention.

[0031] Figure 6 It is a schematic structural diagram of the connecting steel plate according to an embodiment of the present invention.

[0032] Figure 7 It is a schematic structural diagram of the shape memory alloy short column according to an embodiment of the present invention.

[0033] In the figure: 1 - ancient building wooden column, 2 - rubber ring, 3 - L-shaped steel plate, 4 - connecting steel plate, 5 - shape memory alloy short column, 6 - foundation, 7 - rubber ring connecting screw, 8 - L-shaped steel plate connecting bolt, 9 - short column screw. Specific implementation manner

[0034] The present invention will be further described in detail below in conjunction with embodiments.

[0035] As Figure 1-7 shown: ancient building wooden column 1, rubber ring 2, isoprene rubber inner ring 21, styrene-butadiene rubber outer ring 22, L-shaped steel plate 3, connecting steel plate 4, shape memory alloy short column 5, foundation 6, rubber ring connecting screw 7, L-shaped steel plate connecting bolt 8, short column screw 9.

[0036] When the rubber ring 2 is implemented: Since the isoprene rubber inner ring 21 and the styrene-butadiene rubber outer ring 22 in the rubber ring 2 have different material hardness and friction coefficients, when the outer isoprene rubber inner ring 21 rotates, the inner styrene-butadiene rubber outer ring 22 will generate different angular displacements, thereby generating relative rotation to provide frictional force to resist bending moment. The isoprene rubber inner ring 21 and the styrene-butadiene rubber outer ring 22 in the rubber ring 2 should be integrally processed in the factory to reduce the gap between the rubber rings, so that when deforming and dissipating energy, not only can the seismic force be dissipated by deformation, but also the bending moment can be resisted by the friction between the double rings. In order for the rubber ring 2 to simultaneously exhibit its elastic deformation and hardness, it is designed that the difference between the inner and outer diameters of the isoprene rubber inner ring 21 is the same as the radius of the styrene-butadiene rubber outer ring 22. The isoprene rubber inner ring 21 has good elasticity, cold resistance and very high tensile strength; the material of the styrene-butadiene rubber outer ring 22 is styrene-butadiene rubber, which not only has excellent resilience, but also is the most widely circulated synthetic rubber with the best economic effect and is suitable for timely replacement, which can reduce the cost of the device.

[0037] The position of the rubber ring 2 should be 15 - 30 mm away from the column foot to ensure that the moisture under the foundation 6 will not corrode the connecting steel plate 4. Exceeding this height will affect the overall appearance of the ancient building. The height of 30 mm conforms to the general height of the column base in ancient buildings, so as to follow the principle of "repairing the old as the old" to protect ancient buildings.

[0038] Determine the diameter D of the ancient building wooden column 1 that needs to be strengthened, and fabricate a connecting steel plate 4 with a side length of 2D. The inner square side length of the connecting steel plate 4 is 1.25D. The rubber ring 2 should be arranged within a range of 3 - 5 mm from the ancient building wooden column 1. On the one hand, it can avoid the chemical reaction caused by the long-term contact between the outer surface of the ancient building wooden column 1 and the rubber. On the other hand, in the case of small earthquakes, this strengthening device can also provide resistance for the ancient building wooden column 1 and increase its energy dissipation capacity. The L-shaped steel plate 3 is determined according to the position of the rubber ring 2 and welded. The center line of the L-shaped steel plate 3 needs to be on the same straight line as the center line of the rubber ring 2 to avoid initial eccentric force. Then, determine the position of the steel plate connecting bolt 8 at the center of the ear plate of the L-shaped steel plate 3. The connection line between the center of the short column screw 9 of the shape memory alloy short column 5 and the center of the circle of the ancient building wooden column 1 should be perpendicular to the rubber ring 2. The linear distance between the holes of the short column screw 9 and the holes of the steel plate connecting bolt 8 should be greater than the shortest distance required by the steel structure design standard "GB50017 - 2017".

[0039] When implementing the L-shaped steel plate 3: it needs to be fixed to the connecting steel plate 4 with the steel plate connecting bolt 8. After tightening and fixing the position, use fillet welding on three sides to weld the L-shaped steel plate 3 to the top surface of the connecting steel plate 4 to ensure that the position of the rubber ring 2 will not change easily. The specific dimensions can be measured according to the actual column diameter on site.

[0040] When implementing the connecting steel plate 4: steel with a strength higher than Q235 steel can be selected to meet the requirements of the steel plate for high-strength bolts. The specific dimensions of the internal bolt holes of the connecting steel plate 4 are determined according to the steel plate connecting bolt 8 and the short column screw 9. However, the hole spacing needs to meet the requirements of national codes.

[0041] When implementing the shape memory alloy short column 5: Ni-Ti alloy can be selected to obtain higher superelastic properties. The shape memory alloy short column 5 is pre-stretched before use to improve the stability of the short column and enhance its energy dissipation capacity. The specific dimensions can be designed according to whether there is a column base at the bottom of the column.

[0042] [[ID=I2]]When implementing the rubber ring connecting screw 7: bolts with a strength above 10.9 grade and a diameter greater than 10 mm are selected to resist lateral forces, so that the deformation is mainly concentrated in the extrusion and rotation of the rubber ring 2. The rubber ring 2 includes an isoprene rubber inner ring 21 and a styrene-butadiene rubber outer ring 22. The isoprene rubber ring 21 wraps the styrene-butadiene rubber outer ring 22, and the styrene-butadiene rubber outer ring 22 should wrap the rubber ring connecting screw 7. The connection method between the styrene-butadiene rubber outer ring 22 and the rubber ring connecting screw 7 is similar to that of concrete wrapping ribbed steel bars. The styrene-butadiene rubber outer ring 22 has a relatively high hardness and is not easy to move relative to the bolt. However, the screw part inside the styrene-butadiene rubber outer ring 22 still needs to have threads to increase the grip with the styrene-butadiene rubber outer ring 22 and ensure that the rubber ring can always provide resistance for the column foot.

[0043] When the short column screw 9 is implemented: Since this screw needs to be connected to the foundation, it can also be used as a foundation anchor bolt, so it still needs to meet the anchor bolt standards required by the local foundation of the ancient building.

[0044] A method for using an ancient building column base displacement constraint device includes the following steps;

[0045] When the ancient building wooden column 1 is tilted and undergoes rotation, the ancient building wooden column 1 squeezes the rubber ring 2 at the column base. After the rubber ring 2 is squeezed and deformed, it will drive the connecting steel plate 4 to tilt in the horizontal direction through the profiled steel plate connecting bolt 8. At this time, the connecting steel plate 4 will stretch the shape memory alloy short column 5 through the short column screw 9, mainly stretching the shape memory alloy short column 5 in the diagonal direction of the squeezed rubber ring 2, causing it to deform in the vertical direction. Subsequently, the shape memory alloy short column 5 will exert its superelastic performance, provide a self-resetting force, restore its initial original state, and drive the entire connecting steel plate 4 and the framework connected thereto to return to the horizontal position, providing a resisting moment for the column base;

[0046] Under small earthquakes, small displacements occur at the column base of the ancient building wooden column 1. At this time, the reinforcement device only relies on the squeezing deformation of the rubber ring 2 to resist the bending moment, and the squeezing deformation is within the elastic stage of the inner circle 21 of the isoprene rubber. When the external force continues to increase, the rubber ring 2 can not only provide the resistance of the inner circle 21 of the isoprene rubber, but also provide the frictional force generated by the relative displacement between the inner circle 21 of the isoprene rubber and the outer circle 22 of the styrene-butadiene rubber due to the different hardness. In summary, it can achieve no damage under small earthquakes;

[0047] During medium earthquakes, the rubber ring 2 pulls the connecting steel plate 4, and the connecting steel plate 4 stretches the shape memory alloy short column 5 again. The strain corresponding to the superelastic strain of the shape memory alloy short column 5 is 6%-8%. Within the displacement corresponding to this strain, the deformation can return to its original position, achieving repairability during medium earthquakes;

[0048] During large earthquakes, the shape memory alloy short column 5 diagonally opposite to the squeezed rubber ring 2 can no longer resist the external force. However, at this time, the remaining shape memory alloy short columns 5 will continue to provide a resisting moment for the column base of the ancient building wooden column 1, thereby achieving the goal of not collapsing during large earthquakes.

Claims

1. An ancient building column base displacement restraint device, characterized in that It includes a horizontal connecting steel plate (4). A number of shape memory alloy short columns (5) are connected to the bottom surface of the connecting steel plate (4). The shape memory alloy short columns (5) are configured to be supported between the connecting steel plate (4) and the foundation (6). The ancient building wooden column (1) passes through the connecting steel plate (4) and is arranged on the foundation (6). A number of rubber rings (2) are arranged on the top surface of the connecting steel plate (4). The axial direction of the rubber rings (2) is horizontal. Each rubber ring (2) is arranged around the ancient building wooden column (1) to limit the lateral movement of the ancient building wooden column (1). L-shaped steel plates (3) are arranged at both ends of each rubber ring (2). The vertical plate of the L-shaped steel plate (3) contacts the end face of the rubber ring (2), and the horizontal plate of the L-shaped steel plate (3) is fixed on the top surface of the connecting steel plate (4). The rubber ring (2) does not contact the top surface of the connecting steel plate (4), and the height difference between the two should ensure that the rubber ring (2) can rotate freely.

2. The displacement restraint device for the column base of ancient buildings according to claim 1, wherein The rubber ring (2) includes a coaxial isoprene rubber inner ring (21) and a styrene-butadiene rubber outer ring (22). The rubber ring (2) is connected to a rubber ring connecting screw rod (7) with the same or parallel axial direction as it.

3. The ancient building column base displacement constraint device according to claim 2, characterized in that, The isoprene rubber inner ring (21) and the styrene-butadiene rubber outer ring (22) are processed once in the factory. According to the rubber ring production standard, the gap between the double rings is ensured not to exceed 1 mm.

4. The displacement constraint device for the column base of ancient architecture according to claim 3, characterized in that, The isoprene rubber inner ring (21) and the styrene-butadiene rubber outer ring (22) are in close contact, and the two rubbers can generate frictional force when rotating. The rubber ring connecting screw rod (7) is wrapped inside the rubber ring (2).

5. The displacement constraint device for the column base of ancient buildings according to claim 4, characterized in that, The L-shaped steel plate (3) and the connecting steel plate (4) are connected by a shaped steel plate connecting bolt (8) and welding. The connecting bolt (8) is selected as a high-strength bolt. After the L-shaped steel plate (3) is fixed with bolts, the bottom of the L-shaped steel plate (3) is welded to the top surface of the connecting steel plate (4) by using fillet welding on three sides.

6. The ancient building column base displacement constraint device according to claim 5, characterized in that, The bolt holes inside the connecting steel plate (4) are divided into two types, one is connected to the shaped steel plate connecting bolt (8) and the other is connected to the short column screw rod (9). On the premise of meeting the dimensions of other components, the distance between these two types of holes needs to be greater than the shortest distance required by the steel structure design standard "GB50017-2017".

7. The displacement restraint device for the column base of ancient buildings according to claim 6, characterized in that, The shape memory alloy short column (5) is connected to the connecting steel plate by a short column screw rod (9). The shape memory alloy short column (5) and the rubber ring (2) should be arranged at the top corners of the connecting steel plate (4).

8. The usage method of an ancient building column base displacement constraint device according to claim 7, characterized in that, It includes the following steps; When the ancient building wooden column (1) is inclined and undergoes rotation, the ancient building wooden column (1) squeezes the rubber ring (2) at the column foot. After the rubber ring (2) is squeezed and deformed, it will drive the connecting steel plate (4) to tilt in the horizontal direction through the shaped steel plate connecting bolt (8). At this time, the connecting steel plate (4) will stretch the shape memory alloy short column (5) through the short column screw rod (9), mainly stretching the shape memory alloy short column (5) in the diagonal direction of the squeezed rubber ring (2), causing it to deform in the vertical direction. Subsequently, the shape memory alloy short column (5) will exert its superelastic performance, provide a self-resetting force, restore its initial original state, drive the entire connecting steel plate (4) and its connected framework to return to the horizontal position, and provide a moment resistance for the column foot. Under minor earthquakes, small displacements occur at the column feet of the wooden columns (1) of ancient buildings. At this time, the reinforcement device only relies on the extrusion deformation of the rubber ring (2) to resist bending moments. The extrusion deformation is within the elastic stage of the inner ring (21) of isoprene rubber. When the external force continues to increase, the rubber ring (2) can not only provide the resistance of the inner ring (21) of isoprene rubber, but also provide the frictional force generated by the relative displacement due to the different hardness between the inner ring (21) of isoprene rubber and the outer ring (22) of styrene-butadiene rubber. To sum up, it can achieve no damage under minor earthquakes; During moderate earthquakes, the rubber ring (2) pulls the connecting steel plate (4), and the connecting steel plate (4) in turn stretches the shape memory alloy short column (5). The strain corresponding to the superelastic strain of the shape memory alloy short column (5) is 6%-8%. The deformation can return to its original position within the displacement corresponding to this strain, achieving repairability during moderate earthquakes; During major earthquakes, the shape memory alloy short columns (5) at the diagonals of the squeezed rubber ring (2) can no longer resist the external force. However, at this time, the remaining shape memory alloy short columns (5) will continue to provide resistance to bending moments for the column feet of the wooden columns (1) of ancient buildings, thus achieving the goal of not collapsing during major earthquakes.

9. The method for using an ancient building column base displacement constraint device according to claim 8, characterized in that, For the diameter D of the wooden column (1) of the ancient building to be reinforced, a connecting steel plate (4) with a side length of 2D is fabricated. The inner square side length of the connecting steel plate (4) is 1.25D. The rubber ring (2) should be arranged within a range of 3-5 mm from the wooden column (1) of the ancient building. The L-shaped steel plate (3) is determined according to the position of the rubber ring (2) and welded. The center line of the L-shaped steel plate (3) needs to be on the same straight line as the center line of the rubber ring (2). The position of the steel plate connecting bolt (8) is determined at the center of the ear plate of the L-shaped steel plate (3) to connect the shape memory alloy short column (5). The line connecting the center of the short column screw (9) and the center of the circle of the wooden column (1) of the ancient building should be perpendicular to the rubber ring (2). The linear distance between the holes of the short column screw (9) and the holes of the steel plate connecting bolt (8) should be greater than the minimum distance required by the steel structure design standard "GB50017-2017".

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