Laminated wood embedded steel bar butt joint node opposite-pulling device and method thereof

Abstract

The invention discloses a laminated wood embedded steel bar butt joint node opposite-pulling device and method, and belongs to the technical field of laminated wood embedded steel bars. The laminated wood embedded steel bar butt joint node opposite-pulling device comprises a chain tightening assembly, a first connecting lug plate, a first hoop piece, a second hoop piece, a bolt and a second connecting lug plate; the first connecting lug plates are fixedly connected with the first hoop pieces, the first hoop piece and the second hoop piece in one set are detachably installed in the middle of the vertical web member of the side steel truss through bolts, and a chain is arranged between the two first connecting lug plates. The two second connecting lug plates are symmetrically and fixedly installed on the lower chord double-piece wood arch and located on the lower sides of the side span side steel-wood joints and the midspan side steel-wood joints. A chain is arranged between the two connecting lug plates II; a chain tensioning assembly used for tensioning the chain is detachably installed on the wood arch steel frame mixed body. By means of the mode, the butt joint installation process of the embedded steel bar joints of the lower chord double-piece wood arch is converted into low-altitude controllable operation from high-altitude uncontrollable operation, and meanwhile the influence and damage to a main body structure are reduced to the maximum extent.

Description

Technical Field

[0001] This invention relates to the field of glued laminated timber (GLLT) rebar installation technology, specifically to a tie rod device and method for GLLT rebar butt joints. Background Technology

[0002] Currently, there are three main methods for installing the wooden arch joints in large public buildings with a long-span tensioned wooden arch and steel frame hybrid structure. The first is the steel sleeve joint connection method: steel sleeves are pre-embedded or wrapped at the wooden arch joints, and rigid connections are achieved through high-strength bolts or welding. The second is the hybrid connection method (steel plate + self-tapping screws / wooden dowels): steel plates, screws and wooden dowels are used in combination to transfer loads. The third is the BIM + 3D scanning positioning method: the actual dimensions of the wooden arch are obtained by laser scanning before construction, compared with the BIM model, and the joint processing parameters are adjusted.

[0003] The first method suffers from the cold bridge effect, which affects the building's thermal insulation performance. It requires an additional insulation layer, and the steel-wood contact surface is prone to electrochemical corrosion due to the wood's moisture absorption, making corrosion prevention difficult. The long-term maintenance cost is high because the anti-corrosion pad or coating needs to be replaced regularly. Furthermore, due to the significant difference in the elastic modulus between steel and wood, stress concentration is likely to occur at the joint area, which may cause the wood to split or the area around the bolt holes to be crushed. Finally, the sleeve and wooden components need to be precisely machined in the factory, and if the on-site installation deviation exceeds 2mm, rework and adjustment are required, resulting in a low construction error tolerance.

[0004] The second method requires regular tightening of the self-tapping screws under dynamic loads (such as wind vibration and earthquakes), which can easily cause slippage at the steel-wood interface and lead to degradation of the joint stiffness. Additionally, the exposed steel plate needs to be coated with fire-retardant paint, otherwise the softening of the steel in a fire will cause the joint to fail. Furthermore, under repeated loading, the wood around the screw holes is prone to plastic deformation, reducing the fatigue life of the joint. Moreover, it is necessary to accurately calculate the load distribution ratio between steel and wood, otherwise there is a risk of overloading the steel plate and underutilizing the wood.

[0005] The third method requires the use of laser scanners (such as Leica RTC360) or photogrammetry systems, resulting in high equipment procurement and maintenance costs. Furthermore, it requires skilled personnel to operate BIM (Revit, Tekla) and point cloud processing software (such as CloudCompare, AutoCAD Recap), leading to high human resource training costs.

[0006] Limitations of existing technology:

[0007] 1. Changing the original main structural design affects the strength of the main structure and damages the later fireproof, corrosionproof and moisture-proof protection of the main structure;

[0008] 2. Low installation accuracy and high control difficulty;

[0009] 3. High costs for equipment procurement, component processing, and maintenance;

[0010] 4. It is difficult to achieve synchronous mating and tightening of two wooden arches;

[0011] 5. Existing construction methods are all difficult to provide a 200kN clamping force for the wooden arch.

[0012] Based on this, the present invention designs a tie rod device and method for glued laminated timber rebar joint to solve the above problems. Summary of the Invention

[0013] To address the aforementioned shortcomings of existing technologies, this invention provides a tie rod device and method for glued laminated timber rebar joints.

[0014] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0015] A tie rod device for a glued laminated timber rebar joint includes a fastening chain assembly, a connecting ear plate 1, a clamping member 1, a clamping member 2, a bolt, and a connecting ear plate 2;

[0016] Connecting ear plate one is fixedly connected to clamp one. One set of clamp one and clamp two are detachably installed in the middle of the vertical web member of the steel truss on the side span by bolts. Another set of clamp one and clamp two are detachably installed in the middle of the vertical web member of the steel truss on the mid-span side by bolts. A chain is provided between the two sets of connecting ear plates one.

[0017] Two connecting lugs are symmetrically fixedly installed on the lower chord double-piece wooden arch, located below the steel-wood node on the side span and the steel-wood node on the middle span; a chain is provided between the two connecting lugs.

[0018] The wooden arch and steel frame composite structure is equipped with a detachable chain tensioning assembly for tightening the chain.

[0019] Furthermore, the chain tensioning assembly includes a chain tensioner that is detachably mounted on the timber arch steel frame composite body by bolts; the output end of the chain tensioner is equipped with a mechanical lock for connecting the chain.

[0020] To better achieve the objectives of this invention, this invention also provides a tie-down construction method for a tie-down device for glued laminated timber rebar joints, comprising the following steps:

[0021] Step 1: Weld the connecting ear plate 2 to the lower chord double timber arch on the ground, located below the steel-timber node on the side span and the steel-timber node on the middle span;

[0022] Step 2: Use a truck crane to lift and install the hybrid main body of the wooden arch and steel frame; then lift the lower chord double wooden arch, and simultaneously install the rebar joints, side span steel-wood joints and mid-span steel-wood joints between the lower chord double wooden arches, as well as install the upper chord of the steel truss, the side span steel truss vertical web members and the mid-span steel truss vertical web members on the upper side of the lower chord double wooden arches;

[0023] Step 3: Weld the connecting ear plate 1 and the clamping part 1 into a whole piece to form the connecting ear plate-clamping part, and select bolts of appropriate strength according to the actual clamping force of the double wooden arch on the lower chord; fix the two sets of connecting ear plates-clamping parts and clamping part 2 to the vertical web members of the side span steel truss and the vertical web members of the middle span steel truss respectively with bolts.

[0024] Step 4: After all components are installed, apply adhesive to the joints where the rebar is anchored; simultaneously install the fastening chain assembly.

[0025] Step 5: After the glue is applied, apply a clamping force to the wooden arch through the fastening chain assembly according to the design requirements to make the wooden arch stand still and bear the load;

[0026] Step Six: Unload and unlock the fastening chain assembly, remove the connecting ear plate-clamp and clamp two connecting bolts, and move to the rebar joint of the next large-span tensioned timber arch steel frame hybrid structure to continue construction.

[0027] Furthermore, the connecting ear plate two welded to the lower surface of the steel-wood joints on the side span and the steel-wood joint on the middle span is retained; after the wooden arch decorative layer is installed, the connecting ear plate two is placed inside the double wooden arch of the lower chord and is not exposed.

[0028] Furthermore, the static load-bearing time for the wooden arch is set to 24 hours.

[0029] Compared with the prior art, the beneficial effects of this invention are as follows: 1. The lower chord double wooden arch is a double wooden arch cross section, and the connecting ear plate is placed between the two wooden arches of the lower chord double wooden arch. When the tie device is in operation, it ensures the coordinated force of the lower chord double wooden arch, which not only ensures the construction quality of the rebar tie node, but also ensures the overall structural force coordination. This tie method meets the design requirements proposed for this node.

[0030] 2. The process of connecting and installing the rebar joints of the lower chord double-piece wooden arch was transformed from an uncontrollable high-altitude operation to a controllable low-altitude operation, minimizing the impact and damage to the main structure. The use of chain tensioners ensured installation accuracy, reduced controllability, and guaranteed the application of clamping force and load duration on the wooden arch.

[0031] 3. At the same time, the connecting ear plate-clamping parts and clamping parts II and the chain tensioner used in this method are all recyclable devices, and the number of equipment used can be selected according to the actual construction period requirements, which greatly reduces the cost of equipment procurement and component processing and saves the construction period. Attached Figure Description

[0032] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0033] Figure 1 Elevation diagram of the tie rod device at the joint of glued laminated timber rebar anchoring in a large-span tensioned timber arch steel frame hybrid structure;

[0034] Figure 2 A cross-sectional schematic diagram of the tie rod device at the joint of the glued laminated timber rebar joint in a large-span tensioned timber arch steel frame hybrid structure.

[0035] Figure 3 A schematic diagram of the tie rod device at the joint of the glued laminated timber rebar joint in a large-span tensioned timber arch steel frame hybrid structure;

[0036] Figure 4 Elevation diagram for connecting ear plates Figure 1 ;

[0037] Figure 5 Elevation diagram for connecting ear plates Figure 2 .

[0038] The labels in the diagram represent:

[0039] 10. Wooden arch and steel frame hybrid main structure; 11. Steel truss upper chord; 12. Side span steel truss vertical web members; 13. Mid-span steel truss vertical web members; 14. Side span steel-wood joint; 15. Mid-span steel-wood joint; 16. Rebar joint; 17. Lower chord double-piece wooden arch; 20. Connecting ear plate one; 21. Hoop one; 22. Hoop two; 23. Bolt; 24. Connecting ear plate two; 25. Fastening chain assembly. Detailed Implementation

[0040] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0041] The terms "left," "right," "front," "back," "up," and "down" used in the following description refer to the orientation from the perspective of the front view.

[0042] Examples: In some embodiments, please refer to the accompanying drawings. Figure 1-Figure 5 A glued laminated timber rebar butt joint tie device includes a fastening chain assembly 25; it also includes a connecting ear plate 20, a clamping member 21, a clamping member 22, a bolt 23, and a connecting ear plate 24.

[0043] Connecting ear plate 20 is fixedly connected to clamp 21. One set of clamp 21 and clamp 22 is detachably installed in the middle of the vertical web member 12 of the side span steel truss by bolts 23. Another set of clamp 21 and clamp 22 is detachably installed in the middle of the vertical web member 13 of the mid-span steel truss by bolts 23. A chain is provided between the two sets of connecting ear plates 20.

[0044] Two connecting lugs 24 are symmetrically fixedly installed on the lower chord double wooden arch 17, located below the steel-wood node 14 on the side span and the steel-wood node 15 on the middle span; a chain is provided between the two connecting lugs 24.

[0045] A chain tensioning assembly 25 for tightening the chain is detachably installed on the wooden arch steel frame hybrid body 10.

[0046] The chain tensioning assembly 25 includes a chain tensioner, which is detachably mounted on the wooden arch steel frame hybrid body 10 by bolts; the output end of the chain tensioner is equipped with a mechanical lock for connecting the chain;

[0047] The hydraulic chain tensioner selected is a 20t hydraulic chain tensioner, which is a commercially available and mature device in this field.

[0048] A tie-bar construction method for a glued laminated timber rebar butt joint connection includes the following steps:

[0049] Step 1: Weld the connecting ear plate 24 to the lower chord double wooden arch 17 on the ground, located below the steel-wood node 14 on the side span and the steel-wood node 15 on the middle span.

[0050] Step 2: Use a truck crane to lift and install the wooden arch steel frame hybrid main body 10; then lift the lower chord double wooden arch 17, and simultaneously install the rebar node 16, the side span steel-wood node 14 and the mid-span steel-wood node 15 between the lower chord double wooden arch 17, and install the upper chord of the steel truss 11, the side span steel truss vertical web member 12 and the mid-span steel truss vertical web member 13 on the upper side of the lower chord double wooden arch 17;

[0051] Step 3: Weld the connecting ear plate 1 20 and the clamping member 1 21 into a whole to form a connecting ear plate-clamping member, and select bolts 23 of appropriate strength according to the actual clamping force of the double wooden arch 17 of the lower chord; fix the two sets of connecting ear plates-clamping members and clamping member 22 to the vertical web members 12 of the side span steel truss and the vertical web members 13 of the mid-span steel truss respectively with bolts 23;

[0052] Step 4: After all components are installed, apply adhesive to the rebar joint 16; simultaneously install the fastening chain assembly 25.

[0053] Step 5: After the glue is applied, apply a clamping force to the wooden arch through the fastening chain assembly 25 according to the design requirements to make the wooden arch stand still and hold the load;

[0054] The static load holding time for the wooden arch is set to 24 hours;

[0055] Step Six: Unload and unlock the fastening assembly 25, remove the connecting bolts 23 of the connecting ear plate-clamp and clamp 22, and retain the connecting ear plate 24 welded to the lower surface of the side span steel-wood node 14 and the middle span steel-wood node 15; after the wooden arch decorative layer is installed, place the connecting ear plate 24 inside the lower chord double wooden arch 17, without exposing it, and then move the connecting ear plate-clamp and clamp 22 to the rebar node 16 of the next large-span tensioned wooden arch steel frame hybrid structure to continue construction.

[0056] In addition, the lower chord double wooden arch 17 has a double wooden arch cross section, and the connecting ear plate 24 is placed between the double wooden arches of the lower chord double wooden arch 17. When the tie device is in operation, it ensures the coordinated force of the lower chord double wooden arch 17, which not only ensures the construction quality of the rebar tie node, but also ensures the overall structural force coordination. This tie method meets the design requirements proposed for this node.

[0057] This transforms the installation process of the rebar joint 16 of the lower chord double wooden arch 17 from an uncontrollable high-altitude operation to a controllable low-altitude operation, minimizing the impact and damage to the main structure. The use of chain tensioners ensures installation accuracy, reduces controllability, and guarantees the application of clamping force and load duration on the wooden arch.

[0058] Meanwhile, the connecting ear plate-clamping parts and clamping parts 22 and the chain tensioner used in this method are all recyclable devices, and the number of equipment used can be selected according to the actual construction period requirements, which greatly reduces the cost of equipment procurement and component processing and saves the construction period.

[0059] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A tie rod device for a glued laminated timber rebar butt joint, comprising a fastening chain assembly (25), characterized in that: It also includes connecting ear plate one (20), clamp one (21), clamp two (22), bolt (23) and connecting ear plate two (24); Connecting ear plate 1 (20) is fixedly connected to clamp 1 (21). One set of clamp 1 (21) and clamp 2 (22) are detachably installed in the middle of the vertical web member (12) of the steel truss on the side span by bolts (23). Another set of clamp 1 (21) and clamp 2 (22) are detachably installed in the middle of the vertical web member (13) of the steel truss on the middle span by bolts (23). A chain is provided between the two sets of connecting ear plates 1 (20). Two connecting lugs (24) are symmetrically fixed on the lower chord double wooden arch (17) at the lower side of the steel-wood node (14) on the side span and the steel-wood node (15) on the middle span; a chain is provided between the two connecting lugs (24); The wooden arch steel frame hybrid body (10) is detachably equipped with a chain tensioning assembly (25) for tightening the chain.

2. The tie rod device for glued laminated timber rebar butt joints according to claim 1, characterized in that, The chain tensioning assembly (25) includes a chain tensioner that is detachably mounted on the wooden arch steel frame hybrid body (10) by bolts; the output end of the chain tensioner is equipped with a mechanical lock for connecting the chain.

3. A tie-down construction method, wherein the tie-down device for glued laminated timber rebar butt joints according to claim 1, is characterized in that, Includes the following steps: Step 1: Weld the connecting ear plate 2 (24) to the lower chord double wooden arch (17) on the ground, located below the steel-wood node (14) on the side span and the steel-wood node (15) on the middle span. Step 2: Use a truck crane to lift and install the wooden arch steel frame hybrid main body (10); then lift the lower chord double wooden arch (17), and simultaneously install the rebar joint (16), the side span steel-wood joint (14), and the mid-span steel-wood joint (15) between the lower chord double wooden arch (17), and install the upper chord of the steel truss (11), the side span steel truss vertical web members (12), and the mid-span steel truss vertical web members (13) on the upper side of the lower chord double wooden arch (17); Step 3: Weld the connecting ear plate 1 (20) and the clamping part 1 (21) into a whole piece to form the connecting ear plate-clamping part, and select the appropriate strength of bolts (23) according to the actual clamping force of the double wooden arch (17) of the lower chord; fix the two sets of connecting ear plates-clamping parts and clamping part 2 (22) to the vertical web members (12) of the side span steel truss and the vertical web members (13) of the middle span steel truss respectively with bolts (23); Step 4: After all components are installed, apply adhesive to the joint (16) of the rebar anchoring; simultaneously install the fastening chain assembly (25); Step 5: After the glue is applied, apply a clamping force to the wooden arch through the fastening chain assembly (25) according to the design requirements, so that the wooden arch can be statically held under load; Step 6: Unload and unlock the fastening chain assembly (25), remove the connecting bolts (23) of the connecting ear plate-clamp and clamp two (22), and move to the rebar node (16) of the next large-span tensioned timber arch steel frame hybrid structure to continue construction.

4. The tie-down construction method according to claim 3, characterized in that: The connecting ear plate 2 (24) welded to the lower surface of the steel-wood node (14) on the side span and the steel-wood node (15) on the middle span is retained; after the wooden arch decorative layer is installed, the connecting ear plate 2 (24) is placed inside the lower chord double wooden arch (17) and is not exposed.

5. The tie-down construction method according to claim 3, characterized in that, The static load holding time for the wooden arch is set to 24 hours.

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