Virtual pre-assembly and modular installation method of glued laminated wood truss arch

Abstract

The application relates to a virtual pre-assembly and modular installation method of a glued wood truss arch, and belongs to the technical field of wood trusses. The method comprises a small assembly unit, the whole is in a triangular shape, the small assembly unit is composed of one upper chord, two lower chords and a plurality of steel web members, the steel web members are located between the upper chord and the lower chords or between the two lower chords; a middle assembly unit is assembled by a plurality of small assembly units; a support jig is located below the middle assembly unit and is used for supporting the middle assembly unit, a plurality of support jigs are arranged, adjacent support jigs are arranged at intervals along the length direction of the middle assembly unit, and the support height provided by the support jigs changes with the design height of the middle assembly unit; and a tensioner is located at the joint of adjacent small assembly units and is used for tightly connecting the joint of adjacent small assembly units. The application has the effect of guaranteeing the assembly precision of a large-span truss.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wood trusses, in particular to a virtual pre-assembly and modular installation method for glued wood truss arches. BACKGROUND

[0002] A glued wood truss is a truss structure made of glued wood. Glued wood is an engineered wood product made by bonding multiple layers of wood veneer together with adhesive. This gluing process can enhance the strength and stability of the wood, allowing it to withstand greater loads.

[0003] For large-scale trusses, not only are the spans large, but in terms of current aesthetics, the entire shed structure system composed of trusses is often designed into a special shape. Due to the special geometric shape of the shed structure system, the span and height of each span truss are inconsistent, and the precision requirements for constructing the shed are extremely high. The problem of how to accurately install such trusses needs to be solved. SUMMARY

[0004] In order to ensure the accuracy of large-span truss assembly, the present application provides a virtual pre-assembly and modular installation method for glued wood truss arches.

[0005] In a first aspect, the present application provides a virtual pre-assembly of a glued wood truss arch, which adopts the following technical solution:

[0006] A virtual pre-assembly of a glued wood truss arch includes:

[0007] A small assembly unit is in the shape of a triangle as a whole, and is composed of one upper chord, two lower chords, and a plurality of steel web members. The steel web members are located between the upper chord and the lower chords or between two lower chords.

[0008] A middle assembly unit is assembled from a plurality of small assembly units.

[0009] A support jig is located below the middle assembly unit to support the middle assembly unit. The support jig is provided in multiple numbers, and adjacent support jigs are arranged at intervals along the length direction of the middle assembly unit. The support height provided by the support jig changes with the design height of the middle assembly unit.

[0010] A tensioner is located at the joint of adjacent small assembly units to tightly connect the joint.

[0011] By adopting the technical scheme, the large-span truss is split into multiple units, the small assembly units are convenient to assemble and position, the multiple small assembly units are assembled into a middle assembly unit, and the multiple middle assembly units are assembled into the whole truss, so that the whole is refined for construction; the vertical position of the middle assembly unit after hoisting is controlled at any time by the support jig frame, the support jig frame plays a role in vertical support on the middle assembly unit, the joint of the two small assembly units is in a lap joint mode to increase the contact area, and in the process of processing, there are errors or elastic-plastic deformation caused by geometric dimensions, the two small assembly units are tightly fitted by the tensioner, so that the size accuracy of the assembled middle assembly unit is ensured, and the accuracy of the large-span truss assembly is ensured.

[0012] Optionally, the support jig frame comprises a position adjusting frame and towers, the towers are provided in plurality, adjacent towers are assembled in the vertical direction, and the position adjusting frame is fixed to the top of the uppermost tower.

[0013] By adopting the technical scheme, the position adjusting frame is fixed at different heights by selecting appropriate towers, and the middle assembly unit is lifted upward by the first hydraulic cylinder, so that the vertical position of the middle assembly unit is adjusted.

[0014] Optionally, the top of the position adjusting frame is horizontally fixed with a second hydraulic cylinder for pushing the middle assembly unit.

[0015] By adopting the technical scheme, the middle assembly unit placed on the top of the first hydraulic cylinder is pushed in the horizontal direction by the second hydraulic cylinder, so that the position of the middle assembly unit in the horizontal direction is further adjusted, and the assembly of adjacent middle assembly units is more accurate.

[0016] Optionally, the tensioner comprises a positioning cylinder, a binding belt, a long strip tooth and a one-way locking assembly, one end of the binding belt is fixedly connected with the positioning cylinder, the other end is fixedly hooked with the long strip tooth, one end of the long strip tooth is deeply arranged in the positioning cylinder and is slidably arranged relative to the positioning cylinder, and the one-way locking assembly is used for locking the position of the long strip tooth and the positioning cylinder.

[0017] By adopting the technical scheme, the positioning cylinder provides a basic bearing platform, the binding belt is wrapped around the joint of the two small assembly units or the two middle assembly units, the long strip tooth is moved to adjust the length of the binding belt in the outer region of the positioning cylinder, so that the joint of the component is bound and locked, and the joint of the component is tightly sealed.

[0018] Optionally, the end of the long strip tooth is fixed with a lock chain, and the end of the binding belt is fixedly hooked with the lock chain.

[0019] By adopting the technical scheme, the chain has multiple annular structures, the end of the binding belt is conveniently hooked and fixed at different positions of the chain, and the effect of preliminarily adjusting the binding of the component lap joint is achieved.

[0020] In a second aspect, the application provides a modular installation method for virtual pre-assembly of a glued timber truss arch, and adopts the following technical scheme:

[0021] The modular installation method for virtual pre-assembly of a glued timber truss arch comprises the following steps:

[0022] S1, assembling small assembly units by selecting top chords, bottom chords and steel web members, and assembling the small assembly units into middle assembly units;

[0023] S2, after each group of middle assembly units is assembled, a 3D scanner is used to perform accurate scanning to establish a point cloud model, 3 to 6 middle assembly units of the same truss are scanned one by one, and the generated point cloud model is virtually pre-assembled by using SCENE software;

[0024] S3, if the assembly error between the plurality of middle assembly units of the same truss exceeds the allowable range, the middle assembly unit with the error exceeding the allowable range is adjusted until it is qualified; the middle assembly unit is divided into an arch foot hoisting segment, a middle hoisting segment and a folding hoisting segment when hoisted; S4, hoisting from both sides to the middle direction, and finally folding in the middle to complete the installation of the whole truss; the support jig is arranged in the vertical direction below the pre-hoisting position of the middle assembly unit in advance to vertically support the middle assembly unit.

[0025] By adopting the above technical scheme, the large-span truss is divided into a plurality of small assembly units for assembly, which is convenient for construction; the 3D scanner is used to perform accurate scanning to establish a point cloud model, the generated point cloud model is virtually pre-assembled by using SCENE software, the accuracy after pre-assembly can be pre-prepared, if an assembly error occurs and the error exceeds the allowable range, the error is immediately adjusted, so that the position accuracy of the whole truss assembly during subsequent actual hoisting is ensured.

[0026] Optionally, three trusses are taken as a group, and the support jig is cyclically arranged and removed, in this process, before the folding hoisting segment of the adjacent truss is installed and hoisted, no less than 50% of the purline is installed between the two trusses.

[0027] By adopting the above technical scheme, three trusses are taken as a group, and the support jig is cyclically arranged and removed, so that stable support of the truss is ensured, and the support jig is removed after the adjacent trusses form a mutual support structure; and the requirement of the number of purline installations ensures the out-of-plane support of the truss.

[0028] Optionally, in step S4, after the arch foot hoisting section is hoisted, the cantilever end of the arch foot hoisting section and the support jig interact with each other, the deformation of the cantilever end of the arch foot hoisting section is monitored, and the support jig is used to adjust the deformation of the cantilever end of the arch foot hoisting section.

[0029] By adopting the above technical scheme, the deformation amount of the cantilever end of the installed truss arch section is related to the normal installation of the closure section, so before the closure section is installed, the deformation amount of the cantilever end is adjusted to be within a reasonable assembly error range, and after the adjustment by the support jig, the closure section has a certain space with the adjacent installed section when installed, facilitating the normal hoisting and installation of the closure section.

[0030] Optionally, the support jig is located at each truss section splicing node.

[0031] By adopting the above technical scheme, the thinnest part of the splicing node is placed below the support jig to play a supporting and protecting role, and the cantilever end of the splicing member can also be adjusted in position.

[0032] Optionally, the small splicing units are connected and fixed by half-lap connection between the small splicing units to form a middle splicing unit, and the interface is tightly attached by a tensioner during the lap connection and is fixed by a wood screw.

[0033] By adopting the above technical scheme, the tensioner is used at the half-lap node to gradually tighten the two arc beams, so that the half-lap is tightly connected, and then the half-lap node screw connection is performed. When the adjacent small splicing unit half-lap joints are spliced, due to the elastic-plastic deformation caused by the component processing error, geometric size, etc., it is impossible to tightly connect the joints, so the tensioner can overcome such conditions, thereby ensuring the accuracy of the truss splicing position.

[0034] In summary, the present application has at least one of the following beneficial technical effects:

[0035] 1. By supporting the jig to control the vertical position of the middle splicing unit at any time after hoisting, the supporting jig plays a role in vertical support of the middle splicing unit, and the lap joint of the two small splicing units is also used to increase the contact area. In the process of processing, there will be errors or geometric size caused elastic-plastic deformation, the tensioner is used to make the two small splicing units tightly fit, so as to ensure the accuracy of the size of the spliced middle splicing unit, and the accuracy of the large-span truss assembly is ensured; 2. The large-span truss is divided into multiple small splicing units for assembly, which is convenient for construction. The point cloud model is generated by using the 3D scanner to scan accurately and establish the point cloud model. The point cloud model is generated by using the SCENE software to perform virtual pre-assembly. Through the pre-assembly, the accuracy after the assembly can be prefabricated in advance. If the splicing error exceeds the allowed range, the position accuracy of the entire truss splicing can be ensured when hoisting. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 is a structural schematic diagram of the embodiment of the application;

[0037] Figure 2 is a local structure schematic diagram of the tensioner;

[0038] Figure 3 is a local structure sectional view of the tensioner;

[0039] Figure 4 is a schematic diagram of the use state of the supporting jig;

[0040] Figure 5 is a schematic diagram of the structure of the supporting jig;

[0041] Figure 6 is Figure 5 a local enlarged schematic diagram of part A.

[0042] Mark explanation: 1, small splicing unit; 11, upper chord; 12, lower chord; 13, steel web; 2, middle splicing unit; 3, supporting jig; 31, position adjusting frame; 311, base frame; 312, telescopic rod; 313, inclined strut; 314, cross bar; 32, tower; 4, tensioner; 41, positioning cylinder; 42, binding belt; 43, long strip tooth; 431, lock chain; 44, locking assembly; 441, ratchet; 442, first pawl; 443, second pawl; 444, drive wheel; 5, purlin; 6, first hydraulic cylinder; 7, second hydraulic cylinder; 8, slide; 81, rack; 82, rotating rod; 83, second gear; 84, third gear; 9, motor; 91, outer rod; 92, inner rod; 93, screw; 94, bevel gear set; 95, first gear. DETAILED DESCRIPTION

[0043] The following will be combined with the Figures 1-6Further details of the application are described below.

[0044] The embodiment of the application discloses virtual pre-assembly of glued wood truss arch.

[0045] Reference Figure 1 And Figure 2 The virtual pre-assembly of glued wood truss arch comprises a small assembly unit 1, a middle assembly unit 2, a support jig 3 and a tensioner 4. The small assembly unit 1 is in a triangular shape as a whole, and is composed of one upper chord 11, two lower chords 12 and a plurality of steel web members 13. The steel web members 13 are located between the upper chord 11 and the lower chords 12 or between two lower chords 12. The upper chord 11 is a double-assembly larch glued wood arc beam, and the lower chord 12 is a spruce glued wood arc beam. The above special-shaped glued wood finished components are transported to the site after computer digital control precision machining by a three-dimensional model.

[0046] A plurality of small assembly units 1 are assembled to form the middle assembly unit 2. The small assembly unit 1 has a length of 7.5 to 12 meters, and one middle assembly unit 2 is formed by 3 to 5 small assembly units 1 assembled on the ground.

[0047] Reference Figure 2 And Figure 3 The tensioner 4 is located at the lap joint of adjacent small assembly units 1 and is used for closely connecting the lap joint of adjacent small assembly units 1. The tensioner 4 comprises a positioning cylinder 41, a binding belt 42, a long strip tooth 43 and a one-way locking assembly 44. One end of the long strip tooth 43 is deeply arranged in the interior of the positioning cylinder 41 and is arranged in sliding mode relative to the positioning cylinder 41, and the other end of the long strip tooth 43 is fixedly connected with a lock chain 431. The lock chain 431 is made of a plurality of annular rings. One end of the binding belt 42 is fixedly connected with the positioning cylinder 41, and the other end of the binding belt 42 is fixedly connected with the lock chain 431 after being wound around the lap joint of two small assembly units 1.

[0048] Reference Figure 2 And Figure 3The one-way locking assembly 44 is used for locking the position of the long strip tooth 43 and the positioning cylinder 41, and comprises a ratchet wheel 441, a first pawl 442, a second pawl 443 and a driving wheel 444. The driving wheel 444 is rotationally arranged in the positioning cylinder 41, that is, the driving wheel 444 rotates relative to the positioning cylinder 41. The first pawl 442 is hingedly connected to the circumferential outer wall of the driving wheel 444. The ratchet wheel 441 is in the form of a ring, is sleeved outside the driving wheel 444 and has the same center as the driving wheel 444. The inner wall of the ratchet wheel 441 is also sawtooth-shaped and has a distance from the driving wheel 444. The first pawl 442 and the inner wall of the ratchet wheel 441 are used in cooperation. The second pawl 443 is hingedly connected to the inner wall of the positioning cylinder 41 and abuts against the outer wall of the ratchet wheel 441 and is used in cooperation with the ratchet wheel 441. The outer wall of the ratchet wheel 441 is in mesh with the long strip tooth 43. After the user rotates the driving wheel 444, the driving wheel 444 drives the ratchet wheel 441 to rotate through the limiting of the first pawl 442 and the ratchet wheel 441, and the ratchet wheel 441 drives the long strip tooth 43 to move. At this time, the effect of locking the overlap joint of the two small splicing units 1 by the restraint belt 42 is achieved. The second pawl 443 abuts against the outer wall of the ratchet wheel 441, so that the ratchet wheel 441 cannot rotate, thereby ensuring the stable restraint of the restraint belt 42. When the two small splicing units 1 are fixed through bolts, the locking of the restraint belt 42 can be manually released, so that the one-way locking assembly 44 can be repeatedly used. The first pawl 442 and the inner wall of the ratchet wheel 441 are shaped, so that the operator can use a wrench to rotate the ratchet wheel 441 in one direction, and the operation is more convenient.

[0049] In the embodiment, a wrench is used for driving. The cross section of the wrench is rectangular. A rectangular groove is formed in the side wall of the driving wheel 444, and a through hole is formed in the positioning cylinder 41 for the end of the wrench to penetrate.

[0050] With reference to Figure 4 and Figure 5 The support jig 3 is located below the middle splicing unit 2 and is used for supporting the middle splicing unit 2. A plurality of support jigs 3 are provided and are arranged at intervals along the length direction of the middle splicing unit 2. The support height provided by the support jig 3 changes with the design height of the middle splicing unit 2. The support jig 3 comprises a position adjusting frame 31 and a tower 32. A plurality of towers 32 are provided. Adjacent towers 32 are assembled in the vertical direction. The position adjusting frame 31 is fixed to the top of the uppermost tower 32.

[0051] With reference to Figure 5 and Figure 6The positioning frame 31 includes a base frame 311, telescopic rods 312, diagonal braces 313, and crossbars 314. Two telescopic rods 312 are vertically arranged, with their bottom ends fixed to the base frame 311. A slide rail 8 is provided on the base frame 311, which is fixed to the top of the uppermost tower 32. One end of the diagonal brace 313 is slidably disposed within the slide rail 8, and the other end is hinged to the telescopic rod 312. Two diagonal braces 313 and two slide rails 8 are provided. The slide rails 8 are opened horizontally and are positioned towards or away from the telescopic rods 312. The crossbar 314 is slidably disposed between the two telescopic rods 312, and its sliding direction is vertical. A first hydraulic cylinder 6 is vertically fixed to the top of the crossbar 314, and the first hydraulic cylinder 6 is used to lift the intermediate assembly unit 2. A second hydraulic cylinder 7 is fixed on the side wall of the two telescopic rods 312 facing each other. The second hydraulic cylinder 7 is located near the top of the telescopic rod 312. The second hydraulic cylinder 7 is horizontally positioned.

[0052] refer to Figure 5 and Figure 6 An inner rod 92, an outer rod 91, a screw 93, and a motor 9 are provided between the crossbar 314 and the base frame 311. The inner rod 92 is slidably disposed inside the outer rod 91. The screw 93 passes through the inner rod 92. The inner rod 92, the outer rod 91, and the screw 93 have the same length direction. The screw 93 is threadedly connected to the inner rod 92. The cross-sections of the inner rod 92 and the outer rod 91 are both rectangular. The motor 9 is fixed on the base frame 311. The rotating end of the motor 9 extends into the outer rod 91. A bevel gear set 94 is provided between the rotating end of the motor 9 and the end of the screw 93. When the motor 9 rotates, it drives the screw 93 to rotate. At this time, the screw 93 rotates relative to the outer rod 91, and the inner rod 92 begins to move vertically relative to the outer rod 91. The top end of the inner rod 92 is fixedly connected to the crossbar 314, thereby driving the crossbar 314 to move vertically.

[0053] refer to Figure 5 and Figure 6 A rack 81 is mounted on the base frame 311 and slides within the slide rail 8. The end of the diagonal brace 313 is hinged to the rack 81. A first gear 95 is fixed on the rotating shaft of the motor 9. A rotating rod 82 is rotatably mounted on the base frame 311 and rotates relative to the base frame 311. A second gear 83 and a third gear 84 are fixed to the rotating rod 82 in a ring. The first gear 95 meshes with the second gear 83, and the third gear 84 meshes with the rack 81. When the motor 9 starts, the second gear 83 drives the rotating rod 82 to rotate, which in turn drives the rack 81 to move through the third gear 84. The rise of the crossbar 314 causes the telescopic rod 312 to change position, which in turn causes the diagonal brace 313 to change position. The movement of the rack 81 corresponds to the change in position of the diagonal brace 313.

[0054] This application also discloses a virtual pre-assembly and modular installation method for glued laminated timber truss arches, see reference. Figures 1 to 6 .

[0055] comprising the following steps:

[0056] S1, select the upper chord 11, lower chord 12 and steel web 13 assembled into a small unit 1, and the small unit 1 is assembled into a middle unit 2; the small unit 1 is composed of one upper chord 11, two lower chords 12 and several steel webs 13 connecting the upper and lower chords 12, the upper chord 11 is a double-pitched larch glued wood arc beam, the lower chord 12 is a spruce glued wood arc beam, and the whole small unit 1 is in the shape of a triangle. The above special-shaped glued wood finished components are transported to the site after being processed by computer digital control precision machinery generated by three-dimensional model.

[0057] Each module, i.e. a small unit 1, is 7.5 to 12 m long. A large module, i.e. a middle unit 2, is composed of 3 to 5 small units 1 assembled on the ground. Each arch frame is divided into 3 to 6 middle units 2 according to site conditions and the performance requirements of lifting machinery.

[0058] S2, after each middle unit 2 is assembled, a 3D scanner is used to accurately scan and establish a point cloud model, and 3 to 6 middle units 2 of the same truss are scanned one by one, and the generated point cloud model is virtually pre-assembled using SCENE software;

[0059] S3, if the jointing error between the several middle units 2 of the same truss exceeds the allowed range, the middle unit 2 with the excessive deviation is adjusted until it is qualified; the middle unit 2 is hoisted into arch foot hoisting segments, middle hoisting segments and folding hoisting segments;

[0060] S4, hoist from both sides to the middle direction, and finally fold in the middle of the span to complete the installation of the whole truss; the support jig 3 is set in the vertical direction below the pre-hoisting position of the middle unit 2 in advance to vertically support the middle unit 2.

[0061] The small unit 1 and the small unit 1 are connected by half lap jointing, two glued wood arc beams that need to be connected are cut into a tongue and groove connection type by numerical control, the adjacent small units 1 are placed on the support frame by using hoisting and lifting facilities, and the interface is tightly attached by using a tensioner 4, pre-drilling holes according to the design position, and then screwing in wood screws from the outside to the inside. Hoist from both sides of the arch foot to the middle direction, and finally fold in the middle of the span to complete the installation of the whole steel-wood truss arch. This construction method not only ensures the connection quality of the steel-wood composite truss arch, saves the maintenance cost in the later period, avoids the damage of the wood structure, and ensures the architectural decoration effect of the shed frame.

[0062] After the arch foot hoisting segment is hoisted, the cantilever end of the arch foot hoisting segment and the support jig 3 interact with each other, the deformation of the cantilever end of the arch foot hoisting segment is monitored, the support jig 3 is used to adjust the deformation of the cantilever end of the arch foot hoisting segment, and the support jig 3 is located at each truss segment splicing joint. The deformation of the cantilever end of the arch foot hoisting segment and the intermediate hoisting segment that has been installed affects the normal installation of the closure hoisting segment, therefore, before the closure hoisting segment is installed, the deformation of the cantilever end is adjusted to be within a reasonable splicing error range. After the elevations of all the support jigs 3 are adjusted according to the comparison results of the design model and the point cloud model, the elevations of the cantilever ends adjacent to the closure segment are uniformly increased by 20 mm at each chord, so that there is a certain space between the closure hoisting segment and the adjacent installed segment when the closure hoisting segment is installed, facilitating the normal hoisting and installation of the closure hoisting segment. When the closure hoisting segment is placed between the adjacent segments, the first hydraulic cylinder 6 that is intentionally increased is slowly lowered, so that the splicing interfaces of the closure hoisting segment are tightly close to each other.

[0063] Three trusses are taken as a group, and the support jigs 3 are cyclically arranged and removed, in this process, before the closure hoisting segments of adjacent trusses are installed and hoisted, no less than 50% of the purline 5 needs to be installed between the two trusses. After the installation of the three adjacent trusses and the installation of the purline 5 connected therebetween are completed, the subsequent unloading stage can be entered.

[0064] The embodiments of the specific implementation mode are the preferred embodiments of the application, and do not limit the protection scope of the application, therefore: any equivalent changes made according to the structure, shape, principle of the application should be covered within the protection scope of the application.

Claims

1. A virtual pre-assembly of a glued laminated timber truss arch, characterized in that, include: The small assembly unit (1) is triangular in shape. The small assembly unit (1) consists of an upper chord (11), two lower chords (12) and several steel web members (13). The steel web members (13) are located between the upper chord (11) and the lower chords (12) or between the two lower chords (12). The middle unit (2) is assembled from multiple small units (1); Support frame (3) is located below the middle assembly unit (2) to support the middle assembly unit (2). Multiple support frames (3) are provided, and adjacent support frames (3) are spaced apart along the length direction of the middle assembly unit (2). The support height provided by the support frame (3) varies with the design height of the middle assembly unit (2). And a tensioner (4), located at the overlap of adjacent small splicing units (1), for tightly connecting the overlap of adjacent small splicing units (1); The supporting frame (3) includes an adjustment frame (31) and a tower (32). Multiple towers (32) are provided, and adjacent towers (32) are assembled together in the vertical direction. The adjustment frame (31) is fixed to the top of the uppermost tower (32). The adjustment frame (31) includes a base frame (311), a telescopic rod (312), a diagonal brace (313), and a crossbar (314). The telescopic rod (312) is vertically arranged and there are two of them. The bottom end of the telescopic rod (312) is fixed to the base frame (311). A slide rail (8) is provided on the base frame (311). The base frame (311) is fixed to the top of the uppermost tower (32). The diagonal brace (313) is fixed to the top of the tower (32). 13) One end is slidably set in the slide rail (8), and the other end is hinged to the telescopic rod (312). Two diagonal braces (313) and two slide rails (8) are set accordingly. The slide rail (8) is opened in the horizontal direction and in the direction close to or away from the telescopic rod (312). The crossbar (314) is slidably set between the two telescopic rods (312). The sliding direction of the crossbar (314) is set in the vertical direction. The top of the crossbar (314) is vertically fixed with a first hydraulic cylinder (6). The first hydraulic cylinder (6) is used to lift the middle assembly unit (2). An inner rod (92), an outer rod (91), and a screw (93) are set between the crossbar (314) and the base frame (311). The inner rod (92) is slidably set inside the outer rod (91) and the screw (93) passes through the inner rod (92). The inner rod (92), outer rod (91) and screw (93) have the same length direction. The screw (93) is threadedly connected to the inner rod (92). The cross-sections of the inner rod (92) and the outer rod (91) are both rectangular. The motor (9) is fixed on the base frame (311). The rotating end of the motor (9) extends into the outer rod (91). A bevel gear set (94) is set between the rotating end of the motor (9) and the end of the screw (93). A rack (81) is set on the base frame (311). The rack (81) slides in the slide rail (8). The end of the support rod (313) is hinged to the rack (81). A first gear (95) is fixed on the rotating shaft of the motor (9). A rotating rod (82) is rotatably mounted on the base frame (311). The rotating rod (82) rotates relative to the base frame (311). A second gear (83) and a third gear (84) are fixed on the rotating rod (82) with a ring. The first gear (95) meshes with the second gear (83), and the third gear (84) meshes with the rack (81). A second hydraulic cylinder (7) is fixed on the side wall of the two telescopic rods (312) facing each other. The second hydraulic cylinder (7) is located near the top of the telescopic rod (312) and is horizontally positioned.

2. The virtual pre-assembly of the glued laminated timber truss arch according to claim 1, characterized in that: The tensioner (4) includes a positioning cylinder (41), a restraint strap (42), a long tooth (43), and a one-way locking component (44). One end of the restraint strap (42) is fixedly connected to the positioning cylinder (41), and the other end is hooked and fixed to the long tooth (43). One end of the long tooth (43) extends into the interior of the positioning cylinder (41) and slides relative to the positioning cylinder (41). The one-way locking component (44) is used to lock the position of the long tooth (43) and the positioning cylinder (41).

3. The virtual pre-assembly of the glued laminated timber truss arch according to claim 2, characterized in that: The end of the long tooth (43) is fixed with a chain (431), and the end of the restraint strap (42) is hooked and fixed to the chain (431).

4. A modular installation method for virtual pre-assembly of glued laminated timber truss arches as described in claim 1, characterized in that: Includes the following steps: S1. Select the upper chord (11), lower chord (12) and steel web member (13) to assemble into a small assembly unit (1), and assemble the small assembly unit (1) into a medium assembly unit (2); S2. After each group of intermediate units (2) is assembled, a point cloud model is established by using a 3D scanner for precise scanning. The 3 to 6 intermediate units (2) of the same truss are scanned one by one, and the generated point cloud model is virtually pre-assembled using SCENE software. S3. If the splicing error between several intermediate splicing units (2) of the same truss exceeds the allowable range, the intermediate splicing unit (2) that exceeds the deviation shall be adjusted until it is qualified; the intermediate splicing unit (2) is divided into arch foot hoisting segment, intermediate hoisting segment and closing hoisting segment during hoisting. S4. The truss is hoisted from both sides toward the middle and finally joined together at the middle of the span to complete the installation of the whole truss. During hoisting, the support frame (3) is set in advance directly below the pre-hoisting position of the middle assembly unit (2) to provide vertical support for the middle assembly unit (2).

5. The modular installation method for virtual pre-assembly of glued laminated timber truss arches according to claim 4, characterized in that: Using three trusses as a group, the support frame is set up and removed in a cyclical manner (3). During this process, before the closure and hoisting of adjacent trusses, no less than 50% of the purlins (5) must be installed between the two trusses.

6. The modular installation method for virtual pre-assembly of glued laminated timber truss arches according to claim 4, characterized in that: In step S4, after the arch foot hoisting segments on both sides are hoisted, the cantilever end of the arch foot hoisting segment interacts with the support frame (3). The deformation of the cantilever end of the arch foot hoisting segment is monitored, and the deformation of the cantilever end of the arch foot hoisting segment is adjusted using the support frame (3).

7. The modular installation method for virtual pre-assembly of glued laminated timber truss arches according to claim 6, characterized in that: The support frame (3) is located at the splicing node of each truss segment.

8. The modular installation method for virtual pre-assembly of glued laminated timber truss arches according to claim 4, characterized in that: The small assembly units (1) are connected and fixed with each other by a half-lap joint to form a medium assembly unit (2); when lapped, the joint is tightly fitted with a tensioner (4) and fixed with wood screws.

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