In-situ repairing device and method for existing wooden roof truss

Abstract

The application discloses a kind of in-situ repairing device and method of existing wooden roof truss, belong to building construction technical field, device includes bottom cross brace, middle cross brace, for connecting the vertical connecting rod of bottom cross brace and middle cross brace, the structure of bottom cross brace and middle cross brace is same and located in same plane, both include first rod body, second rod body with first rod body along transverse sliding fit connection, hydraulic cylinder for being installed in one end of first rod body and being used to drive second rod body displacement, first rod body is away from one end where second rod body is located, second rod body is away from one end where first rod body is located, and chord connecting piece is installed, chord connecting piece is connected with upper chord of wooden roof truss;The first rod body of bottom cross brace is connected with one end of vertical connecting rod by first rotating pin, and the first rod body of middle cross brace is installed with second rotating pin.The application can realize the fast and accurate repair of wooden roof truss in high altitude in-situ without unloading.

Description

Technical Field

[0001] This invention belongs to the field of building construction technology, specifically relating to an in-situ repair device and method for existing wooden roof trusses. Background Technology

[0002] Timber structures hold a vital position in existing historical buildings and protected historical buildings. Timber roof trusses, as one of the typical roof truss forms in my country, are widely used in various brick-timber or brick-concrete structures, and are commonly found in historical and cultural protected buildings. Therefore, protecting timber roof trusses is of great importance. Due to their age, long service life, or neglect, timber structures are prone to timber decay, insect infestation, deterioration, cracking, aging, truss tilting, damage to local components or supports, and rust, deformation, and incompleteness of joints or connectors. Therefore, accurately assessing the actual damage to timber roof trusses and efficiently and safely repairing them is of paramount importance. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide an in-situ repair device and method for existing wooden roof trusses, which can realize rapid and accurate repair of wooden roof trusses in situ at high altitudes without unloading.

[0004] To achieve the above objectives, the present invention provides the following technical solution: This invention discloses an in-situ repair device for existing wooden roof trusses, comprising a bottom horizontal tie rod, a middle horizontal tie rod, and a vertical connecting rod for connecting the bottom and middle horizontal tie rods. The bottom and middle horizontal tie rods have identical structures and are located in the same plane. Both include a first rod body, a second rod body that slides laterally with the first rod body, and a hydraulic cylinder installed at one end of the first rod body for driving the displacement of the second rod body. A chord connector is installed at the end of the first rod body away from the second rod body, and at the end of the second rod body away from the first rod body. The chord connector is connected to the upper chord of the wooden roof truss. The first rod body of the bottom horizontal tie rod is connected to one end of the vertical connecting rod via a first rotating pin. A second rotating pin is installed on the first rod body of the middle horizontal tie rod. A vertical opening groove that mates with the second rotating pin is provided on the vertical connecting rod. The bottom and middle horizontal tie rods are locked to the vertical connecting rod by locking components.

[0005] Furthermore, the chord connector includes a third rod body, at least one end of which is equipped with a third rotating pin. The third rotating pin is rotatably connected to a support, and the support and the third rod body are locked together by a locking member. The support is connected to a locking member, which is fixedly installed on the outside of the upper chord.

[0006] Furthermore, the engaging component includes a first petal and a second petal. One side of the first petal is hinged to one side of the second petal, and a hook is hinged to the other side of the first petal. A locking ridge corresponding to the hook is provided on the other side of the second petal. Rubber pads are installed on the inner sides of both the first and second petals, and the end of the support is hinged to the end of the first petal.

[0007] Furthermore, a T-shaped groove is formed at one end of the first rod, and a T-shaped block is formed at one end of the second rod that mates with the first rod. The T-shaped block is slidably fitted into the T-shaped groove along the lateral direction. The hydraulic cylinder is fixed at one end of the first rod, and the output end of the hydraulic cylinder is connected to the second rod.

[0008] Furthermore, a transverse opening groove is provided on the first rod of the bottom horizontal tie rod, and the first rotating pin is slidably installed in the transverse opening groove.

[0009] Furthermore, a rotating shaft is rotatably mounted on the first rod, with a ratchet and a gear connected to its two ends respectively. The ratchet and gear are arranged on both sides of the first rod. A rack is arranged transversely on one side of the second rod, and the rack meshes with the gear. A bracket is fixedly mounted on the other side of the second rod, and a pawl is rotatably mounted on the bracket. The pawl engages with the ratchet. An elastic pressure plate is also mounted on the bracket, which provides an elastic clamping force to the pawl toward the side where the ratchet is located.

[0010] A method for in-situ repair of existing wooden roof trusses, employing the repair device described in any of the above-mentioned methods, includes the following repair steps: (1) First install the bottom horizontal tie rod so that it corresponds to the position of the bottom lower chord. Adjust the hydraulic cylinder of the bottom horizontal tie rod so that the chord connectors at both ends of the bottom horizontal tie rod are connected and matched with the upper chord of the wooden roof truss. (2) Ensure that the vertical connecting rod is in a vertical state, then adjust the position and angle of the middle horizontal tie rod so that it corresponds to the position of the middle lower chord of the wooden roof truss. Adjust the hydraulic cylinder of the middle horizontal tie rod so that the chord connecting parts at both ends of the middle horizontal tie rod are connected and matched with the upper chord of the wooden roof truss. Then tighten each locking part. (3) Adjust the hydraulic cylinders of the bottom horizontal tie rod and the middle horizontal tie rod to adjust the roof truss configuration to the original design configuration; (4) Replace the damaged lower chord as a whole and temporarily connect the replaced lower chord to the existing members of the roof truss; (5) Add jacks at the support of the wooden roof truss and use the jacking device to sink and restore the roof truss support to its original position. Adjust the bottom horizontal tie rod and the middle horizontal tie rod under real-time monitoring to restore the roof truss position and fix the replaced lower chord.

[0011] The beneficial effects of this invention are as follows: This invention discloses an in-situ repair device and method for existing wooden roof trusses. By setting adjustable bottom and middle horizontal tie rods, the roof truss structure is temporarily connected and reinforced, thereby avoiding damage to the wooden roof truss during construction. The adjustable function can be used to tighten the overall deformation of the roof truss inward, which can quickly restore the roof truss position. Using the above structure, it is possible to realize the repositioning of the roof truss and the replacement of damaged members in situ at high altitude. By utilizing the temporary reinforcement members and the original roof truss members to share the load, a safe transfer of load can be achieved. Attached Figure Description

[0012] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the following figures are provided for illustration: Figure 1 This is a schematic diagram of the structure of the device of the present invention; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 for Figure 1 Enlarged view of point B in the middle; Figure 4 This is a schematic diagram of the bottom horizontal tie rod. Figure 5 This is a schematic diagram of the second rod. Figure 6 This is a schematic diagram of the structure of the device of the present invention during use; Figure 7 This is a front view of the device of the present invention in use; Figure 8 This is a schematic diagram of a wooden roof truss.

[0013] The following are the markings in the attached diagram: Bottom horizontal tie rod 1, middle horizontal tie rod 2, vertical connecting rod 3, first rod body 4, second rod body 5, hydraulic cylinder 6, chord connector 7, first rotating pin 8, second rotating pin 9, vertical opening slot 10, third rod body 11, third rotating pin 12, support 13, first petal body 14, second petal body 15, hook 16, locking ridge 17, rubber pad 18, T-slot 19, T-block 20, horizontal opening slot 21, rotating shaft 22, ratchet 23, gear 24, rack 25, bracket 26, pawl 27, elastic pressure plate 28, upper chord 29, bottom lower chord 30, middle lower chord 31, vertical rod 32, diagonal web rod 33. Detailed Implementation

[0014] like Figures 1-8As shown, the present invention discloses an in-situ repair device for existing wooden roof trusses, wherein the wooden roof truss includes at least two upper chords 29 arranged in a triangle and one lower chord 30. The middle parts of the two upper chords 29 are connected by a middle lower chord 31. The middle chord and the lower lower chord 30 are kept parallel. Vertical rods 32 are connected between the upper end of the upper chord 29 and the middle lower chord 31, and between the middle lower chord 31 and the lower lower chord 30. Multiple diagonal web members 33 are also connected between the upper chord 29 and the lower lower chord 30.

[0015] The in-situ repair device of the present invention includes a bottom horizontal tie rod 1, a middle horizontal tie rod 2, and a vertical connecting rod 3 for connecting the bottom horizontal tie rod 1 and the middle horizontal tie rod 2. The bottom horizontal tie rod 1 and the middle horizontal tie rod 2 have the same structure and are located in the same plane. The bottom horizontal tie rod 1 and the middle horizontal tie rod 2 are basically parallel during use. During use, the bottom horizontal tie rod 1 and the middle horizontal tie rod 2 correspond to the bottom lower chord rod 30 and the middle lower chord rod 31, respectively. That is, the bottom horizontal tie rod 1 and the middle horizontal tie rod 2 are located on one side of the bottom lower chord rod 30 and the middle lower chord rod 31, respectively, and are corresponding in a side-by-side manner, which can facilitate subsequent stretching and adjustment.

[0016] In terms of specific structure, the two are basically the same, with only slight differences in length. Taking the bottom horizontal tie rod 1 as an example, the bottom horizontal tie rod 1 includes a first rod 4, a second rod 5 that is slidably connected to the first rod 4 along the lateral direction, and a hydraulic cylinder 6 installed at one end of the first rod 4 to drive the displacement of the second rod 5. Both the first rod 4 and the second rod 5 are arranged along the lateral direction. The end of the first rod 4 away from the second rod 5 and the end of the second rod 5 away from the first rod 4 are both equipped with chord connectors 7. The chord connectors 7 are connected to the upper chord 29 of the wooden roof truss.

[0017] The first rod 4 of the bottom horizontal tie rod 1 is connected to the lower end of the vertical connecting rod 3 via a first rotating pin 8. Before locking, the vertical connecting rod 3 can be rotated to adjust its angle, facilitating the installation of the bottom horizontal tie rod 1 and the middle horizontal tie rod 2. A second rotating pin 9 is installed on the first rod 4 of the middle horizontal tie rod 2. A vertical opening slot 10 is provided on the vertical connecting rod 3 to cooperate with the second rotating pin 9. The bottom horizontal tie rod 1, the middle horizontal tie rod 2, and the vertical connecting rod 3 are respectively locked together by locking devices. By designing the vertical opening slot 10, the spacing between the bottom horizontal tie rod 1 and the middle horizontal tie rod 2 can be adjusted according to different specifications of wooden roof trusses, resulting in better adaptability.

[0018] This invention uses adjustable bottom horizontal tie rod 1 and middle horizontal tie rod 2 to temporarily connect and reinforce the wooden roof truss structure, thereby preventing the wooden roof truss from being damaged by stress during construction; by using the adjustable function to tighten the overall deformation of the roof truss inward, the roof truss position can be quickly and accurately restored.

[0019] In this embodiment, the chord connector 7 includes a third rod body 11. At least one end of the third rod body 11 is equipped with a third rotating pin 12. The third rotating pin 12 is rotatably connected to a support 13, which allows adjustment of the angle between the support 13 and the third rod body 11, facilitating the connection between the locking member on the support 13 and the upper chord 29. Similarly, after the angle adjustment is completed, the support 13 and the third rod body 11 are locked together by a locking member. The support 13 is connected to a locking member, which is fixedly installed on the outside of the upper chord 29. When the crossbar retracts, the third rod body 11 can drive the upper chord 29 to retract through the locking member, thereby adjusting the shape of the wooden frame.

[0020] In this embodiment, the engaging component includes a first petal 14 and a second petal 15. Both the first petal 14 and the second petal 15 are semi-circular shell structures, and together they form a cylindrical structure that can engage the upper chord rod 29. One side of the first petal 14 is hinged to one side of the second petal 15, and a hook 16 is hinged to the other side of the first petal 14. The other side of the second petal 15 is provided with a locking ridge 17 corresponding to the hook 16. When the hook 16 and the locking ridge 17 are engaged, the engaging component can be closed, thereby achieving a clamping effect. Rubber pads 18 are installed on the inner sides of both the first petal 14 and the second petal 15. The rubber pads 18 can improve the tightness of the engagement. The end of the support 13 is hinged to the end of the first petal 14, which facilitates the engagement and installation between the engaging component and the upper chord rod 29.

[0021] In this embodiment, a T-shaped groove 19 is formed at one end of the first rod 4, and a T-shaped block 20 is formed at the other end of the second rod 5 that mates with the first rod 4. The T-shaped block 20 is slidably installed in the T-shaped groove 19 along the lateral direction, which ensures smooth engagement between the first rod 4 and the second rod 5 and prevents derailment. A hydraulic cylinder 6 is fixed to one end of the first rod 4, and the output end of the hydraulic cylinder 6 is connected to the second rod 5. Activating the hydraulic cylinder 6 enables the extension and retraction of the crossbar.

[0022] In this embodiment, a transverse opening groove 21 is provided on the first rod body 4 of the bottom horizontal tie rod 1, and the first rotating pin 8 is slidably installed in the transverse opening groove 21. By using the transverse opening groove 21, when it is necessary to adjust the length of the bottom lower chord 30 of different wooden roof trusses, the position of the first rotating pin 8 in the transverse opening groove 21 can be changed, so that the vertical connecting rod 3 always remains vertical, which facilitates the subsequent adjustment of the crossbar and makes the repair process more stable.

[0023] In this invention, all locking components are nuts, and the outer end of each rotating pin is provided with a thread that mates with the nut. Locking can be achieved by connecting the rotating pin and the nut.

[0024] In this embodiment, a rotating shaft 22 is rotatably mounted on the first rod 4. A ratchet 23 and a gear 24 are connected to both ends of the rotating shaft 22, respectively. The ratchet 23 and gear 24 are positioned on opposite sides of the first rod 4. A rack 25 is arranged laterally on one side of the second rod 5, located on the same side as the gear 24, and meshes with the gear 24. A bracket 26 is fixedly mounted on the other side of the second rod 5, located on the same side as the ratchet 23. A pawl 27 is rotatably mounted on the bracket 26, engaging with the ratchet 23. An elastic pressure plate 28 is also mounted on the bracket 26, providing an elastic clamping force to the pawl 27 towards the side of the ratchet 23. By designing the ratchet 23 and pawl 27 to work together, unidirectional displacement between the first rod 4 and the second rod 5 can be achieved when the bottom horizontal tie rod 1 and the middle horizontal tie rod 2 are tightened. This prevents the springback problem of the wooden roof truss structure caused by the instability of the hydraulic cylinder 6 and can improve the stability of the device during the repair process.

[0025] A method for in-situ repair of existing wooden roof trusses, employing the repair device described in any of the above-mentioned methods, includes the following repair steps: (1) First install the bottom horizontal tie rod 1 so that it corresponds to the position of the bottom lower chord rod 30. Adjust the hydraulic cylinder 6 of the bottom horizontal tie rod 1 so that the chord connecting parts 7 at both ends of the bottom horizontal tie rod 1 are connected and cooperated with the upper chord rod 29 of the wooden roof frame. (2) Ensure that the vertical connecting rod 3 is in a vertical state, then adjust the position and angle of the middle horizontal tie rod 2 so that it corresponds to the position of the middle lower chord 31 of the wooden roof truss, adjust the hydraulic cylinder 6 of the middle horizontal tie rod 2 so that the chord connecting parts 7 at both ends of the middle horizontal tie rod 2 are connected and cooperated with the upper chord 29 of the wooden roof truss, and then tighten each locking part. (3) Adjust the hydraulic cylinders 6 of the bottom horizontal tie rod 1 and the middle horizontal tie rod 2 to adjust the roof truss configuration to the original design configuration; (4) Replace the damaged lower chord as a whole and temporarily connect the replaced lower chord to the existing members of the roof truss; (5) Add a jack at the wooden roof truss support 13 and use the jacking device to sink the roof truss support 13 back into place. Under real-time monitoring, adjust the bottom horizontal tie rod 1 and the middle horizontal tie rod 2 to restore the roof truss position and fix the replaced lower chord.

Claims

1. An in-situ repair device for existing wooden roof trusses, characterized in that: The system includes a bottom horizontal tie rod, a middle horizontal tie rod, and a vertical connecting rod connecting the bottom and middle horizontal tie rods. The bottom and middle horizontal tie rods have the same structure and are located in the same plane. Both include a first rod body, a second rod body that slides laterally with the first rod body, and a hydraulic cylinder installed at one end of the first rod body to drive the displacement of the second rod body. A chord connector is installed at the end of the first rod body away from the second rod body, and at the end of the second rod body away from the first rod body. The chord connector is connected to the upper chord of the wooden roof truss. The first rod body of the bottom horizontal tie rod is connected to one end of the vertical connecting rod through a first rotating pin. A second rotating pin is installed on the first rod body of the middle horizontal tie rod. A vertical opening groove that mates with the second rotating pin is opened on the vertical connecting rod. The bottom and middle horizontal tie rods are locked to the vertical connecting rod by locking devices.

2. The in-situ repair device for existing wooden roof trusses according to claim 1, characterized in that: The chord connector includes a third rod body, at least one end of which is equipped with a third rotating pin. The third rotating pin is rotatably connected to a support. The support and the third rod body are locked together by a locking device. The support is connected to a locking device, which is fixedly installed on the outside of the upper chord.

3. The in-situ repair device for existing wooden roof trusses according to claim 2, characterized in that: The locking component includes a first petal and a second petal. One side of the first petal is hinged to one side of the second petal, and a hook is hinged to the other side of the first petal. A locking ridge corresponding to the hook is provided on the other side of the second petal. Rubber pads are installed on the inner sides of both the first and second petals. The end of the support is hinged to the end of the first petal.

4. The in-situ repair device for existing wooden roof trusses according to claim 3, characterized in that: One end of the first rod has a T-shaped groove, and the second rod has a T-shaped block at one end that mates with the first rod. The T-shaped block is installed in the T-shaped groove along the lateral sliding fit. The hydraulic cylinder is fixed at one end of the first rod, and the output end of the hydraulic cylinder is connected to the second rod.

5. The in-situ repair device for existing wooden roof trusses according to claim 4, characterized in that: A transverse opening groove is provided on the first rod of the bottom horizontal tie rod, and the first rotating pin is slidably installed in the transverse opening groove.

6. The in-situ repair device for existing wooden roof trusses according to claim 1, characterized in that: A rotating shaft is rotatably mounted on the first rod, with a ratchet and a gear connected to its two ends respectively. The ratchet and gear are arranged on both sides of the first rod. A rack is arranged transversely on one side of the second rod, and the rack meshes with the gear. A bracket is fixedly mounted on the other side of the second rod, and a pawl is rotatably mounted on the bracket. The pawl engages with the ratchet. An elastic pressure plate is also mounted on the bracket, which provides an elastic clamping force to the pawl toward the side where the ratchet is located.

7. A method for in-situ repair of existing wooden roof trusses, characterized in that: Using the repair device as described in any one of claims 1-6, the repair steps are as follows: (1) First install the bottom horizontal tie rod so that it corresponds to the position of the bottom lower chord. Adjust the hydraulic cylinder of the bottom horizontal tie rod so that the chord connectors at both ends of the bottom horizontal tie rod are connected and matched with the upper chord of the wooden roof truss. (2) Ensure that the vertical connecting rod is in a vertical state, then adjust the position and angle of the middle horizontal tie rod so that it corresponds to the position of the middle lower chord of the wooden roof truss. Adjust the hydraulic cylinder of the middle horizontal tie rod so that the chord connecting parts at both ends of the middle horizontal tie rod are connected and matched with the upper chord of the wooden roof truss. Then tighten each locking part. (3) Adjust the hydraulic cylinders of the bottom and middle horizontal tie rods to adjust the roof truss configuration to the original design configuration; (4) Replace the damaged lower chord as a whole and temporarily connect the replaced lower chord to the existing members of the roof truss; (5) Add jacks at the support of the wooden roof truss and use the jacking device to sink and restore the roof truss support to its original position. Adjust the bottom horizontal tie rod and the middle horizontal tie rod under real-time monitoring to restore the roof truss position and fix the replaced lower chord.

Images