Double-piece wood arch installation and construction method

Abstract

The invention discloses a double-piece wood arch installation and construction method, and belongs to the technical field of wood arch construction. During construction, a lower chord wood arch beam is divided into multiple sections according to arch foot nodes, inhaul cable nodes and embedded steel bar nodes; the wood beams, the wood secondary beams, the steel beams and the steel secondary beams are sequentially installed through hoisting equipment; after installation is completed, glue injection is conducted on the embedded steel bar joints of the wood beam, and standing is conducted for 24 h after glue injection is completed; and meanwhile, the side span sliding trolley is moved to the next truss to assemble the wood beam of the next truss. By means of the mode, the lower chord wood arched beam is segmented according to the arch foot nodes, the inhaul cable nodes and the embedded steel bar nodes, the hoisting load and the working radius of hoisting equipment are reduced, the overall installation difficulty of the lower chord super-long wood arch of the large-span string steel-wood mixed structure is lowered, the length of a single wood beam is reduced, and the construction cost is reduced. The overturning risk caused by machining or center-of-gravity shift during machining of the single wood beam is reduced; in the whole construction, a step-by-step splicing mode from one end to the other end is adopted, and compared with two-end-to-midspan splicing, the installation error is reduced.

Description

Technical Field

[0001] This invention relates to the field of timber arch construction technology, specifically to a method for installing a double-piece timber arch. Background Technology

[0002] Currently, there are three main methods for installing the wooden arches of the lower chord of the roof in large-span tensioned steel-wood hybrid structures. The first is the overall lifting method, which uses a "ground assembly + overall vertical lifting" process, utilizing a hydraulic synchronous lifting system, and requiring the installation of a lattice-type lifting tower as an auxiliary lifting measure. The second is the sliding accumulation method, which involves setting up an assembly platform at the end or side of the structure, assembling the wooden arch units in sections, sliding them along the track to the design position, and accumulating them one by one to form a whole. The third is the cantilever assembly method, which involves installing wooden arch sections sequentially from the arch foot, with each section forming a new cantilever structure until the structure is closed.

[0003] However, the first method is difficult to control synchronously. When lifting from multiple points, if the hydraulic system or sensors are not synchronized enough, it can easily lead to excessive local stress in the wooden arch, causing the wood to crack or the nodes to be damaged. In addition, the entire assembly must be completed on the ground before lifting, requiring the construction of a large assembly platform, which places high demands on the site and increases the cost of temporary support. Furthermore, large-span wooden arches are sensitive to wind loads and have low stiffness during the lifting process, making them prone to swaying under wind loads. It is necessary to install additional wind-resistant cables or suspend the operation. The lifting stability of complex curved surfaces or asymmetrical wooden arch shapes is poor, and it may be necessary to lift in stages, which increases the construction period.

[0004] The second method is prone to friction and wear problems. The coefficient of friction between the wooden arch and the slide rail is unstable during the sliding process (especially affected by humidity), which can easily lead to sliding deviation or wear on the wood surface. In addition, when sliding and splicing in sections, the installation error of a single section (such as elevation and axis deviation) will accumulate segment by segment, eventually affecting the overall alignment accuracy. Furthermore, the support points need to be dynamically adjusted during the sliding process, which is sensitive to the rigidity of the slide rail and foundation settlement. Repeated corrections may be required. Then, subsequent construction can only be carried out after the previous section has slid into place. The connection between the procedures is not tight, and the efficiency is lower than that of the overall improvement.

[0005] The third method relies heavily on temporary cables. During cantilever construction, temporary back cables or supports need to be set up to balance the overturning moment. Improper control of cable pretension can lead to excessive deflection of the wooden arch. Furthermore, the cantilever end nodes bear a large bending moment before closure. The wood has weak tensile strength and is prone to cracks or loosening of nodes. The wooden arch deforms significantly in the cantilever state (such as creep and temperature deformation), requiring real-time monitoring and adjustment. It also requires extremely high measurement accuracy. This method involves a large amount of high-altitude work and has poor wind resistance before the overall structure is formed, so the operating wind speed must be strictly limited.

[0006] In summary, the limitations of current technologies are as follows:

[0007] 1. The lifting load and working radius of the lifting equipment are limited. The overall installation of the ultra-long wooden arch of the lower chord of the large-span tensioned steel-wood hybrid structure is difficult. Moreover, the risk of overturning can easily occur when hoisting such long components due to processing or center of gravity shift.

[0008] 2. Cumulative installation errors occurred during the installation of the extra-long components, resulting in a mismatch between the lower chord wooden arch line and the design line;

[0009] 3. Due to the characteristics of the steel-wood hybrid structure, the steel truss needs to be installed simultaneously when the wooden arch is installed. However, when the steel-wood structure is combined, the welding slag is prone to damage the lower chord wooden structure.

[0010] 4. If the lower support system adopts traditional full-span scaffolding, it will require a large amount of material and the high-altitude support erection will take a long time.

[0011] Based on this, the present invention designs a method for installing a double-piece wooden arch to solve the above problems. Summary of the Invention

[0012] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a method for installing a double-piece wooden arch.

[0013] To achieve the above objectives, the present invention provides the following technical solution:

[0014] A method for installing a double-piece wooden arch includes the following steps:

[0015] Step 1: Divide the lower chord wooden arch beam into multiple sections according to the arch foot nodes, cable nodes, and rebar nodes; erect the upper chord steel truss end support frame and the lower chord wooden arch end support frame, and at the same time erect the lower end support scaffolding of the wooden arch on the side span sliding trolley;

[0016] Step 2: Using hoisting equipment, place the rightmost first wooden beam onto the supporting scaffold at the bottom of the wooden arch. The supporting scaffold at the bottom of the wooden arch will support the wooden beam, and then temporarily fix the end of the first wooden beam. Hoist the second wooden beam to the installation position and temporarily fix the other end of the second wooden beam to the first wooden beam. Simultaneously install the secondary wooden beams.

[0017] Step 3: Repeat Step 2 to complete the installation of the first section of the wooden arch beams, and simultaneously assemble the steel beams and secondary steel beams of the first section of the steel truss on the ground jig; then install the second section of the wooden arch beams, and simultaneously install the steel beams and secondary steel beams of the first section of the steel truss on the upper side of the first section of the wooden arch, and simultaneously assemble the steel beams and secondary steel beams of the second section of the steel truss on the ground jig; complete the installation of the wooden beams of the third, fourth and fifth sections of the wooden arch, as well as the installation of the upper steel frame and secondary steel beams, using the same operation;

[0018] Step 4: Install steel cables and steel struts; inject adhesive into the joints between the wooden beams, and let them stand for 24 hours after the adhesive is injected; at the same time, move the side span sliding trolley to the next frame to assemble the next frame of wooden beams.

[0019] Furthermore, the lower chord wooden arch beam is divided into five sections: wooden arch one, wooden arch two, wooden arch three, wooden arch four, and wooden arch five, based on the arch foot node, cable node, and rebar node.

[0020] Furthermore, the first, second, third, fourth, and fifth wooden arches are all composed of multiple wooden beams, with the ends of the beams joined together using rebar splicing.

[0021] Furthermore, the temporary fixing method for the end of the first wooden beam of the wooden arch is to temporarily fix the wooden arch to the steel corbel on the large-span tensioned steel-wood hybrid roof using pins.

[0022] Furthermore, the number of pins used for temporary fixing is half the total number of bolt holes at the connection.

[0023] Furthermore, during the assembly of the wooden beams, no glue is applied to the joints where the rebar is anchored, and adjacent wooden beams are tightened together using a tensioning device.

[0024] Furthermore, the installation sequence of the wooden beams and steel secondary beams is as follows: first, complete the installation of the first section of wooden beams for the wooden arch; then, complete the installation of the second section of wooden beams for the wooden arch, simultaneously completing the installation of the steel frame and steel secondary beams of the first steel truss on the upper side of the first wooden arch; then, complete the installation of the third section of wooden beams for the wooden arch, simultaneously completing the installation of the steel frame and steel secondary beams of the second steel truss on the upper side of the second wooden arch; then, complete the installation of the fourth section of wooden beams for the wooden arch, simultaneously completing the installation of the steel frame and steel secondary beams of the third steel truss on the upper side of the third wooden arch; then, complete the installation of the fifth section of wooden beams for the wooden arch, simultaneously completing the installation of the steel frame and steel secondary beams of the fourth and fifth steel trusses on the upper sides of the fourth and fifth wooden arches.

[0025] Furthermore, the steel frame and secondary steel beams are bolted together using an aerial work platform, and a welding basket is installed on the underside of the welding joint before welding.

[0026] Compared with existing technologies, the advantages of this invention are as follows: Dividing the lower chord wooden arch beam into segments based on arch foot nodes, cable nodes, and rebar nodes reduces the lifting load and working radius of the lifting equipment, lowers the overall installation difficulty of the ultra-long lower chord wooden arch in a large-span tensioned steel-wood hybrid structure, and reduces the length of individual wooden beams, thus reducing the risk of overturning due to processing or center of gravity shift during the processing of individual wooden beams; the overall construction adopts a step-by-step assembly method from one end to the other, which reduces installation errors compared to assembling from both ends towards the middle of the span, resulting in a gradual reduction of cumulative installation errors; and the use of temporary hinged bolts for fixing during construction allows the arch's shape to be adjusted in real time according to the design shape during its formation; during construction, a welding basket is used to prevent welding slag from falling and damaging the main wooden structure; four sliding trolleys are used at the bottom of the wooden arch, allowing the sliding trolleys on the side spans to move to the next axis after the tensioned structure is installed, thus improving construction efficiency. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0028] Figure 1 A schematic diagram of the installation and construction of a double-piece timber arch in a large-span tensioned steel-timber hybrid structure.

[0029] Figure 2 A schematic diagram of the installation and construction of the upper steel structure of a large-span tensioned steel-wood hybrid arch with two timber panels.

[0030] Figure 3 Elevation diagram of the hanging basket used for the installation and construction of a double-piece wooden arch with a large-span tensioned steel-wood hybrid structure;

[0031] Figure 4 Elevation diagram of the entire trial assembly process of a large-span tensioned steel-wood hybrid double-piece timber arch structure. Figure 1 ;

[0032] Figure 5 Elevation diagram of the entire trial assembly process of a large-span tensioned steel-wood hybrid double-piece timber arch structure. Figure 2 ;

[0033] Figure 6 Elevation diagram of the entire trial assembly process of a large-span tensioned steel-wood hybrid double-piece timber arch structure. Figure 3 ;

[0034] Figure 7 Elevation diagram of the entire trial assembly process of a large-span tensioned steel-wood hybrid double-piece timber arch structure. Figure 4 ;

[0035] Figure 8 Elevation diagram of the entire trial assembly process of a large-span tensioned steel-wood hybrid double-piece timber arch structure. Figure 5 ;

[0036] Figure 9 Elevation diagram of the entire trial assembly process of a large-span tensioned steel-wood hybrid double-piece timber arch structure. Figure 6 ;

[0037] Figure 10 This is a schematic diagram of the elevation of the support frame at the end of the lower chord wooden arch;

[0038] Figure 11 This is a schematic diagram of the plan view of the support frame at the end of the lower chord wooden arch;

[0039] Figure 12 This is a schematic diagram of the elevation of the end support frame of the upper chord steel truss.

[0040] The labels in the diagram represent:

[0041] 10. Large-span tensioned steel-timber hybrid roof structure; 11. Pin shaft; 12. Steel strut; 13. Steel cable; 14. Sliding trolley; 15. Steel corbel; 16. Timber arch one; 17. Timber arch two; 18. Timber arch three; 19. Timber arch four; 20. Timber arch five; 21. Steel truss one; 22. Steel truss two; 23. Steel truss three; 24. Steel truss four; 25. Steel truss five; 26. Welding basket; 27. Upper chord steel truss end support frame; 28. Lower chord timber arch end support frame; 29. ​​Timber arch lower end support scaffolding. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0043] 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.

[0044] Example 1: In some embodiments, please refer to the accompanying drawings. Figures 1-12 A method for installing a double-piece wooden arch includes the following steps:

[0045] Step 1: Divide the lower chord wooden arch beam into multiple sections according to the arch foot node, cable node, and rebar node; erect the upper chord steel truss end support frame 27 and the lower chord wooden arch end support frame 28, and at the same time erect the lower end support scaffolding 29 of the wooden arch on the side span sliding trolley 14.

[0046] Step 2: Using hoisting equipment, place the rightmost first wooden beam onto the lower support scaffold 29 of the wooden arch. The wooden beam is then supported by the lower support scaffold 29, and the end of the first wooden beam is temporarily fixed. Hoist the second wooden beam to the installation position and temporarily fix the other end of the second wooden beam to the first wooden beam. Simultaneously install the secondary wooden beams.

[0047] Step 3: Repeat Step 2 to complete the installation of the 16th segment of the wooden arch, and simultaneously assemble the steel beam and secondary steel beam at position 21 of the steel truss on the ground frame; then install the 17th segment of the wooden arch, and simultaneously install the steel beam and secondary steel beam at position 21 of the steel truss on the upper side of the wooden arch, and simultaneously assemble the steel beam and secondary steel beam at position 22 of the steel truss on the ground frame; complete the installation of the wooden beams at positions 18 of the wooden arch, 19 of the wooden arch, and 20 of the wooden arch, as well as the installation of the upper steel frame and secondary steel beams, using the same operation;

[0048] Step 4: Install steel cables 13 and steel struts 12; inject adhesive into the joints between the wooden beams, and let them stand for 24 hours after the adhesive is injected; at the same time, move the side span sliding trolley 14 to the next frame to assemble the next frame of wooden beams.

[0049] The lower chord wooden arch beam is divided into five sections based on the arch foot nodes, cable nodes, and rebar nodes: Wooden Arch 1 (16), Wooden Arch 2 (17), Wooden Arch 3 (18), Wooden Arch 4 (19), and Wooden Arch 5 (20).

[0050] Wooden arches 16, 27, 318, 419, and 520 are all composed of multiple wooden beams, with the ends of the wooden beams being assembled and spliced ​​using rebar anchoring.

[0051] The temporary fixing method for the end of the first wooden beam of the wooden arch 16 is to temporarily fix the wooden arch 16 to the steel bracket 15 on the large-span tensioned steel-wood hybrid structure roof 10 through the pin 11.

[0052] The number of pins 11 used for temporary fixing is half the total number of bolt holes at the connection.

[0053] During the assembly of the wooden beams, no glue is applied to the joints where the rebar is anchored, and adjacent wooden beams are tightened together using a tensioning device.

[0054] The tensioning device includes connecting lugs, a pull rope, and a tensioner for tightening the pull rope; the lugs are fixedly installed on adjacent wooden beams and connected by the pull rope;

[0055] The installation sequence of the timber beams and steel secondary beams is as follows: First, complete the installation of timber beams in section 16 of the first timber arch; then complete the installation of timber beams in section 17 of the second timber arch, simultaneously completing the installation of the steel frame and steel secondary beams of steel truss 21 above timber arch 16; then complete the installation of timber beams in section 18 of the third timber arch, simultaneously completing the installation of the steel frame and steel secondary beams of steel truss 22 above timber arch 17; then complete the installation of timber beams in section 19 of the fourth timber arch, simultaneously completing the installation of the steel frame and steel secondary beams of steel truss 23 above timber arch 18; then complete the installation of timber beams in section 20 of the fifth timber arch, simultaneously completing the installation of the steel frame and steel secondary beams of steel truss 24 and steel truss 25 above timber arch 19 and timber arch 20.

[0056] The steel frame and secondary steel beams are bolted together using an aerial work platform. Before welding, a welding basket 26 is installed on the lower side of the welding joint.

[0057] The lower chord wooden arch beam is divided into 5 sections based on the arch foot node, cable node, and rebar node. This reduces the lifting load and working radius of the lifting equipment, lowers the overall installation difficulty of the ultra-long lower chord wooden arch of the large-span tensioned steel-wood hybrid structure, and reduces the length of individual wooden beams, thus reducing the risk of overturning caused by processing or center of gravity shift during the processing of individual wooden beams.

[0058] The overall construction adopts a step-by-step assembly method from one end to the other, which reduces installation errors compared to assembling from both ends to the middle of the span. This gradually reduces the cumulative installation error. In addition, temporary hinge bolts are used to fix the wooden arch during the construction and installation process, so that the shape of the wooden arch can be adjusted in real time according to the design shape when it is formed.

[0059] During construction, a welding hanging basket 26 was used to prevent welding slag from falling and damaging the main wooden structure.

[0060] The lower part of the wooden arch uses four sliding trolleys 14. After the tensioned structure is installed, the sliding trolleys 14 on the side span can move to the next axis to assemble the first section of the next wooden arch beam, thus improving construction efficiency.

[0061] 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 method for installing a double-piece wooden arch, characterized in that: Includes the following steps: Step 1: Divide the lower chord wooden arch beam into multiple sections according to the arch foot node, cable node, and rebar node; erect the upper chord steel truss end support frame (27) and the lower chord wooden arch end support frame (28), and at the same time erect the lower end support scaffolding (29) on the side span sliding trolley (14); Step 2: Place the rightmost first wooden beam on the lower support scaffold (29) of the wooden arch using hoisting equipment. Support the wooden beam with the lower support scaffold (29) of the wooden arch, and then temporarily fix the end of the first wooden beam. Hoist the second wooden beam to the installation position and temporarily fix the other end of the second wooden beam to the first wooden beam. Simultaneously install the secondary wooden beam. Step 3: Repeat Step 2 to complete the installation of the wooden beams of section 1 (16) of the wooden arch, and simultaneously assemble the steel beams and secondary steel beams at section 1 (21) of the steel truss on the ground frame; then install the wooden beams of section 2 (17) of the wooden arch, and simultaneously install the steel beams and secondary steel beams at section 1 (21) of the steel truss on the upper side of section 1 (16), and simultaneously assemble the steel beams and secondary steel beams at section 2 (22) of the steel truss on the ground frame; complete the installation of the wooden beams at sections 3 (18), 4 (19) and 5 (20) of the wooden arch, as well as the installation of the upper steel frame and secondary steel beams using the same operation; Step 4: Install steel cables (13) and steel struts (12); inject adhesive into the joints between the wooden beams and let them stand for 24 hours after the adhesive is injected; at the same time, move the side span sliding trolley (14) to the next frame to assemble the next frame of wooden beams.

2. The method for installing a double-piece wooden arch according to claim 1, characterized in that, The lower chord wooden arch beam is divided into five sections based on the arch foot node, cable node, and rebar node: wooden arch one (16), wooden arch two (17), wooden arch three (18), wooden arch four (19), and wooden arch five (20).

3. The method for installing a double-piece wooden arch according to claim 2, characterized in that, Wooden arch one (16), wooden arch two (17), wooden arch three (18), wooden arch four (19) and wooden arch five (20) are all composed of multiple wooden beams, and the ends of the wooden beams are assembled and spliced ​​by planting rebar.

4. The method for installing a double-piece wooden arch according to claim 3, characterized in that, The temporary fixing method for the end of the first wooden beam of the wooden arch (16) is to temporarily fix the wooden arch (16) to the steel bracket (15) on the large-span tensioned steel-wood hybrid roof (10) through the pin (11).

5. The method for installing a double-piece wooden arch according to claim 4, characterized in that, The number of pins (11) used for temporary fixing is half the total number of bolt holes at the connection.

6. The method for installing a double-piece wooden arch according to claim 5, characterized in that, During the assembly of the wooden beams, no glue is applied to the joints where the rebar is anchored, and adjacent wooden beams are tightened together using a tensioning device.

7. The method for installing a double-piece wooden arch according to claim 6, characterized in that, First, complete the installation of the wooden beams of section 1 (16) of the wooden arch; then complete the installation of the wooden beams of section 2 (17) of the wooden arch, and simultaneously complete the installation of the steel frame and secondary steel beams of the steel truss 1 (21) on the upper side of the wooden arch 1 (16); then complete the installation of the wooden beams of section 3 (18) of the wooden arch, and simultaneously complete the installation of the steel frame and secondary steel beams of the steel truss 2 (22) on the upper side of the wooden arch 2 (17); then complete the installation of the wooden beams of section 4 (19) of the wooden arch, and simultaneously complete the installation of the steel frame and secondary steel beams of the steel truss 3 (23) on the upper side of the wooden arch 3 (18); then complete the installation of the wooden beams of section 5 (20) of the wooden arch, and simultaneously complete the installation of the steel frame and secondary steel beams of the steel truss 4 (24) and steel truss 5 (25) on the upper side of the wooden arch 4 (19) and the upper side of the wooden arch 5 (20).

8. The method for installing a double-piece wooden arch according to claim 7, characterized in that, The steel frame and secondary steel beams were bolted together using an aerial work platform. Before welding, a welding basket (26) was installed on the underside of the welding joint.

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