Self-locking anti-sway guide device for hoisting truss members

Abstract

The application relates to the technical field of building truss construction, and discloses a self-locking anti-shaking guiding device for hoisting a truss member, which comprises a base arranged on a mounting base surface or a construction platform and used for vertically placing a truss member to be hoisted; a guiding assembly arranged on the base and used for providing vertical guidance for the member to be hoisted; a hoisting seat arranged above the guiding assembly and used for being connected with hoisting equipment; a locking mechanism arranged on the hoisting seat and used for automatically locking or releasing the hoisting seat and the upper end of the member to be hoisted; and a triggering mechanism linked with the locking mechanism, which triggers the locking mechanism to release during the lowering process of the hoisting equipment. The anti-shaking cage and the guiding column are matched, full-process vertical guidance is provided in the moment when the member is hoisted off the ground, the pendulum shaking of the member is effectively restricted, the shaking caused by unstable gravity center, wind load or impact of the hoisting machine is avoided, and the hoisting efficiency and safety are improved.

Description

Technical Field

[0001] This invention relates to the field of building truss construction technology, and more specifically, to a self-locking anti-sway guide device for hoisting vertical members of large-span spatial trusses. Background Technology

[0002] During the installation of large-span spatial trusses (such as stadiums, airport terminals, and convention centers), a large number of vertical members need to be precisely connected to the already installed main truss nodes at high altitudes. These vertical members typically have a large slenderness ratio and a high center of gravity, and their hoisting process faces the following technical challenges: First, when the component is lifted off the ground, due to the unstable center of gravity, wind load, or the impact of the crane starting, it will produce a large pendulum-like sway. At this time, the component is still several meters away from the installation node, and the sway amplitude is large. The operator cannot hold and control it by hand and can only wait for it to decay naturally, which seriously reduces the lifting efficiency. Secondly, components in a swinging state are prone to impacting completed structures, concrete columns, and surrounding construction equipment, causing paint to peel off the surface of the components. In severe cases, it may even cause deformation of steel structural members, affecting structural safety and service life.

[0003] While some hoisting guidance devices exist in existing technologies, most are complex in structure and cumbersome to operate, and cannot achieve automatic locking and anti-sway functions during the hoisting process, making it difficult to meet the needs of efficient and safe construction of large-span spatial trusses. Summary of the Invention

[0004] To address the technical problems existing in the background art, the present invention provides a self-locking anti-sway guiding device for hoisting truss components, which can automatically lock and anti-sway guiding during the hoisting process of the components, thereby improving hoisting efficiency and safety.

[0005] To achieve the above objectives, the present invention proposes a self-locking anti-sway guiding device for hoisting truss components, comprising: The base is set on the installation surface or construction platform and is used to vertically place the truss components to be hoisted. A guide assembly, disposed on the base, is used to provide vertical guidance for the component to be hoisted; A lifting base, positioned above the guide assembly, is used for connection to lifting equipment; A locking mechanism is provided on the lifting base for automatically locking or releasing the lifting base to the upper end of the component to be lifted; The triggering mechanism is linked to the locking mechanism. The triggering mechanism triggers the locking mechanism to release during the lowering of the lifting equipment and triggers the locking mechanism to lock during the lifting of the lifting equipment.

[0006] As a further optimized solution of the present invention, the guiding assembly includes a plurality of guide posts and guide sleeves corresponding to each of the guide posts. Each guide post is fixedly installed on the base, and each guide sleeve is fixedly installed on an anti-sway cage and slidably sleeved with the corresponding guide post. The anti-sway cage is sleeved on the outside of the component to be hoisted. Preferably, there are two or four guide columns, symmetrically distributed on the upper surface of the base, and each guide column extends vertically; the anti-sway cage is an annular cage structure, sleeved on the outside of the component to be hoisted, and the guide sleeve is fixedly installed on the outside of the anti-sway cage and slides in cooperation with the guide column.

[0007] As a further optimization of the present invention, the anti-sway cage and the hoisting seat are fixedly connected by multiple hoisting rods, and the hoisting seat is located above the anti-sway cage and moves synchronously with the anti-sway cage; Preferably, there are multiple lifting rods, which are evenly distributed around the circumference of the anti-sway cage. The upper end of each lifting rod is fixedly connected to the lifting seat, and the lower end is fixedly connected to the anti-sway cage, so that the lifting seat and the anti-sway cage form a rigidly connected overall frame structure.

[0008] As a further optimization of the present invention, the upper end of the hoisting base is connected to a top plate via a connecting rod, the upper end of the top plate is provided with a sling for connecting to a hoisting device, the connecting rod is telescopic relative to the hoisting base, and the triggering mechanism is disposed between the top plate and the locking mechanism; Preferably, the hoisting base has an adjustment cavity inside, the lower end of the connecting rod slides into the adjustment cavity and is equipped with a slider, the slider slides against the inner wall of the adjustment cavity, so that the connecting rod can slide up and down in the adjustment cavity to achieve extension and retraction.

[0009] As a further optimization of the present invention, the triggering mechanism includes a trigger rod and a rack disposed at the lower end of the trigger rod. The upper end of the trigger rod is fixedly connected to the top plate, and the rack meshes with the gear of the locking mechanism. When the top plate moves downward relative to the lifting base, the rack drives the gear to rotate in the forward direction to trigger the locking mechanism to release. When the top plate moves upward relative to the lifting base, the rack drives the gear to rotate in the reverse direction to trigger the locking mechanism to lock. Preferably, the trigger rod is vertically arranged, with its upper end fixedly connected to the lower end face of the top plate. The hoisting base has a vertical guide hole for the trigger rod to pass through. The rack is fixedly arranged at the lower end of the trigger rod and is arranged opposite to the gear of the locking mechanism.

[0010] As a further optimized solution of the present invention, the locking mechanism includes a bearing seat, a movable ring, a bolt, and a gear. The bearing seat is fixedly installed on the lifting base. The movable ring is rotatably installed on the bearing seat and has an internal thread on its inner wall. The bolt is threadedly sleeved with the movable ring. The gear is sleeved on the outer circumference of the movable ring. The lower end of the lifting base is provided with a mating block that is inserted and engaged with the upper end of the component to be lifted. The bolt's screw end passes through a through hole in the side wall of the mating block and extends into the slot of the mating block. Preferably, the bearing seat is fixedly installed on the side of the docking block and located below the lifting seat. The movable ring is rotatably connected to the bearing seat through the bearing. The gear is coaxially fixedly connected to the movable ring. The axis of the bolt is horizontally set and coincides with the axis of the movable ring. The screw end of the bolt is slidably engaged with the through hole of the side wall of the docking block.

[0011] As a further optimization of the present invention, the number of locking mechanisms is two, symmetrically distributed on both sides of the docking block, and the number of triggering mechanisms is the same as the number of locking mechanisms and corresponds one-to-one, so as to achieve bilateral symmetrical locking. Preferably, the two locking mechanisms are respectively disposed on opposite sides of the docking block, and the two trigger rods respectively mesh with the gears of the two locking mechanisms to achieve synchronous locking and synchronous release.

[0012] As a further optimization of the present invention, the inner wall of the anti-sway cage is provided with a plurality of elastic clamping mechanisms, each of which is used to elastically clamp the outer wall of the component to be hoisted to provide an auxiliary stabilizing effect. Preferably, the elastic clamping mechanism includes a guide sleeve, a sliding top seat, and a roller. The guide sleeve is fixedly installed on the inner wall of the anti-sway cage and is horizontally arranged. One end of the sliding top seat is slidably fitted inside the guide sleeve and connected to the inner wall of the guide sleeve by a spring. The other end of the sliding top seat extends to the outside of the guide sleeve and is rotatably mounted with the roller. The axis of the roller is vertically arranged and makes rolling contact with the outer wall of the component to be hoisted.

[0013] As a further optimization of the present invention, the lower end of the docking block is provided with a slot that matches the upper end of the component to be hoisted. When the locking mechanism is in the locked state, the screw end of the bolt is inserted into the component hole at the upper end of the component to be hoisted. Preferably, the shape of the slot is adapted to the shape of the upper end of the component to be hoisted, and the component hole at the upper end of the component to be hoisted is coaxially corresponding to the through hole on the side wall of the docking block.

[0014] As a further optimization of the present invention, the upper end surface of the base is provided with a positioning structure, which is used to position the lower end of the component to be hoisted to prevent the component to be hoisted from tipping over. Preferably, the positioning structure is a slot or limiting groove formed on the upper surface of the base, and the shape of the slot or limiting groove is adapted to the shape of the lower end of the component to be hoisted.

[0015] The self-locking anti-sway guide device for hoisting truss components described above has the following advantages compared with the prior art: 1. This invention provides full vertical guidance at the moment the component is lifted off the ground by setting up a cooperative structure of anti-sway cage and guide column, which effectively restrains the pendulum-like sway of the component and avoids swaying caused by unstable center of gravity, wind load or crane impact, thereby improving hoisting efficiency and safety.

[0016] 2. This invention, through the linkage design of the triggering mechanism and the locking mechanism, utilizes the lowering and lifting actions of the lifting equipment itself to automatically complete the release and locking of the locking mechanism, realizing the automatic locking and release of the lifting base and the component, eliminating the need for manual high-altitude operation, simplifying the operation process, and reducing safety risks.

[0017] 3. The locking mechanism of the present invention adopts a combination structure of gear and rack transmission and bolt thread transmission. The bolt can be automatically screwed into or out of the component hole by moving the trigger rod up and down. The locking is reliable and the release is convenient. The symmetrical locking on both sides ensures the stability of the connection.

[0018] 4. The present invention provides elastic auxiliary support for the components on the basis of guiding and anti-swaying through the elastic clamping mechanism on the inner wall of the anti-sway cage, which effectively reduces the impact of wind load and starting impact on the components and improves the stability of the hoisting process.

[0019] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] Figure 1 This is a front view of the present invention. Figure 2 This is a front cross-sectional view of the anti-sway cage of the present invention; Figure 3 This is a front cross-sectional view of the hoisting base of the present invention in a suspended state. Figure 4 This is a front cross-sectional view of the hoisting base of the present invention in a relaxed, grounded state. Figure 5 This is a side view of the hoisting base of the present invention.

[0021] Figure descriptions: 1. Base; 2. Guide column; 3. Vertical component; 4. Anti-sway cage; 5. Guide sleeve; 6. Lifting seat; 7. Connecting rod; 8. Top plate; 9. Lifting sling; 10. Connecting block; 11. Lifting rod; 12. Locking mechanism; 121. Bearing seat; 122. Moving ring; 123. Bolt; 124. Gear; 13. Guide sleeve; 14. Sliding top seat; 15. Roller; 16. Component hole; 17. Trigger rod; 171. Rack; 18. Adjustment cavity; 19. Slider. Detailed Implementation

[0022] Embodiments of the present invention are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar symbols denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0023] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0024] Please see Figures 1 to 5 The self-locking anti-sway guide device for hoisting truss components proposed in this invention mainly includes a base 1, a guide assembly, an anti-sway cage 4, a hoisting seat 6, a locking mechanism 12, and a triggering mechanism.

[0025] The base 1 is fixedly installed on the mounting base or construction platform and is used to vertically place the vertical component 3 to be hoisted. The upper end of the base 1 is provided with a positioning structure such as a slot or a limiting groove to position the lower end of the vertical component 3 and prevent the component from tipping over during the hoisting process.

[0026] The guide assembly is set on the base 1, including multiple guide posts 2 and guide sleeves 5 corresponding to each guide post 2. Each guide post 2 is vertically fixed on the upper end face of the base 1 and symmetrically distributed on the periphery of the vertical member 3. Each guide sleeve 5 is fixedly installed on the outside of the anti-sway cage 4 and is slidably sleeved with the corresponding guide post 2, so that the anti-sway cage 4 can move up and down along the guide post 2.

[0027] The anti-sway cage 4 is a ring-shaped cage structure, which is fitted outside the vertical member 3. The anti-sway cage 4 and the lifting seat 6 are fixedly connected by multiple lifting rods 11, so that the two form a rigidly connected overall frame.

[0028] The hoisting base 6 is located above the anti-sway cage 4. Its lower end is provided with a docking block 10. The lower end of the docking block 10 is provided with a slot that matches the upper end of the vertical member 3. The upper end of the hoisting base 6 is connected to the top plate 8 through the connecting rod 7. The upper end of the top plate 8 is provided with a sling 9 for connecting with the hook of the hoisting equipment.

[0029] The locking mechanism 12 is located on the side of the docking block 10 and is used to automatically lock or release the docking block 10 to the upper end of the vertical member 3. The triggering mechanism is located between the top plate 8 and the locking mechanism 12, and triggers the action of the locking mechanism 12 by the relative movement between the top plate 8 and the lifting seat 6.

[0030] Please see Figure 3 and Figure 4 The hoisting base 6 has an adjustment cavity 18 inside. The upper end face of the hoisting base 6 has a movable hole that communicates with the adjustment cavity 18. The lower end of the connecting rod 7 slides through the movable hole and extends into the adjustment cavity 18, and a slider 19 is installed thereon. The outer wall of the connecting rod 7 is clearance-fitted with the inner wall of the movable hole. The slider 19 is slidably connected to the inner wall of the adjustment cavity 18, so that the connecting rod 7 can slide up and down in the adjustment cavity 18, thereby realizing the telescopic adjustment of the distance between the top plate 8 and the hoisting base 6.

[0031] There are two connecting rods 7 and two adjusting chambers 18, arranged symmetrically to improve stability.

[0032] The triggering mechanism includes a trigger rod 17 and a rack 171 disposed at the lower end of the trigger rod 17. The upper end of the trigger rod 17 is fixedly connected to the lower end face of the top plate 8 and extends vertically downward. A vertical guide hole is provided on the lifting base 6 for the trigger rod 17 to pass through. The lower end of the trigger rod 17 passes through the vertical guide hole and extends to the lower part of the lifting base 6. The rack 171 is fixedly disposed at the lower end of the trigger rod 17, located below the lifting base 6, and is disposed opposite to the gear 124 of the locking mechanism 12.

[0033] The vertical guide hole serves as a vertical guide for the trigger rod 17, ensuring that the rack 171 can accurately mesh with the gear 124. The number of trigger rods 17 is consistent with the number of locking mechanisms 12, corresponding one-to-one.

[0034] The locking mechanism 12 includes a bearing housing 121, a movable ring 122, a bolt 123, and a gear 124. The bearing housing 121 is fixedly installed on the side of the docking block 10, located below the lifting base 6. The movable ring 122 is rotatably connected to the bearing housing 121 through a bearing, and its inner wall is provided with internal threads. The bolt 123 is threadedly engaged with the movable ring 122, and its screw end passes through the horizontal through hole opened in the side wall of the docking block 10 and extends into the slot of the docking block 10. The gear 124 is fixedly fitted on the outer circumference of the movable ring 122 and is coaxially arranged with the movable ring 122.

[0035] Gear 124 meshes with rack 171 at the lower end of trigger rod 17. When trigger rod 17 moves up and down, it drives gear 124 to rotate through rack 171. Gear 124 drives movable ring 122 to rotate synchronously. Movable ring 122 drives bolt 123 to extend or retract axially through threaded transmission.

[0036] There are two locking mechanisms 12, symmetrically distributed on both sides of the docking block 10. The number of trigger rods 17 is the same as the number of locking mechanisms 12 and corresponds one-to-one, so as to realize bilateral symmetrical locking and unlocking and improve locking stability.

[0037] Please see Figure 2 The inner wall of the anti-sway cage 4 is equipped with multiple elastic clamping mechanisms symmetrically distributed on both sides or the outer periphery of the vertical member 3. Each elastic clamping mechanism includes a guide sleeve 13, a sliding top seat 14, and a roller 15.

[0038] The guide sleeve 13 is fixedly installed on the inner wall of the anti-sway cage 4, and is horizontally set with its open end facing the center of the anti-sway cage 4. One end of the sliding top seat 14 is slidably fitted into the guide sleeve 13 and is connected to the inner wall of the guide sleeve 13 by a spring. The other end of the sliding top seat 14 extends to the outside of the guide sleeve 13 and is rotatably mounted with a roller 15. The roller 15 is made of polyurethane or nylon and has an anti-slip texture on its surface. The axis of the roller 15 is set horizontally and makes rolling contact with the outer wall of the vertical member 3, and can roll in the vertical direction.

[0039] Through the combined design of spring and sliding top seat 14, roller 15 can elastically roll on the side of vertical member 3. Multiple elastic clamping mechanisms elastically clamp the outer wall of vertical member 3 from different directions, playing an auxiliary stabilizing role and reducing the impact of external factors such as wind load and starting impact on the member.

[0040] The complete working process of this self-locking anti-sway guide device is as follows: Preparation stage: The vertical component 3 is placed vertically in the positioning structure at the upper end of the base 1. The hook of the lifting equipment is connected to the sling 9, and the entire device is lifted. Under the action of gravity, the lifting seat 6 slides down to the lower end of the connecting rod 7. The connecting rod 7 is in a fully extended state. At this time, the trigger rod 17 is located above the gear 124, and the trigger rod 17 is disengaged from the gear 124.

[0041] Lowering and docking stage: The lifting equipment moves the device to directly above the vertical component 3, and then slowly lowers it. The anti-sway cage 4 is inserted between multiple guide columns 2, and the guide sleeve 5 slides from top to bottom onto the guide column 2 to play a guiding role. The lowering continues until the slot at the lower end of the docking block 10 is inserted and assembled with the upper end of the vertical component 3. At this time, the upper end of the vertical component 3 forms a support for the docking block 10.

[0042] Release phase: The hook of the lifting equipment continues to lower. As the vertical component 3 bears the weight of the lifting seat 6 and the anti-sway cage 4, the top plate 8 loses its support and gradually falls relative to the lifting seat 6. The connecting rod 7 drives the slider 19 to gradually slide down along the inner wall of the adjusting cavity 18. At the same time, the top plate 8 drives the trigger rods 17 on both sides to move down synchronously. The rack 171 at the lower end of the trigger rod 17 gradually meshes with the gear 124, driving the gear 124 and the movable ring 122 to rotate in the forward direction. The bolt 123 is gradually pulled outward under the action of the thread transmission. When the connecting rod 7 drives the slider 19 to move down to the lowest point, the rack 171 stops moving down. At this time, the screw end of the bolt 123 is completely pulled out from the slot of the docking block 10 and retracted into the through hole on the side of the docking block 10. The locking mechanism 12 is in the released state.

[0043] Locking stage: The lifting equipment is restarted, and the hook moves the top plate 8 upward through the sling 9. The connecting rod 7 moves the slider 19 upward along the adjusting cavity 18, and the trigger rod 17 moves upward synchronously. The rack 171 drives the gear 124 and the movable ring 122 to rotate in opposite directions, and the bolt 123 gradually spirals inward. When the slider 19 moves to the highest position, the rack 171 and the gear 124 disengage again. At this time, the screw end of the bolt 123 is fully inserted into the component hole 16 at the upper end of the vertical component 3, completing the automatic locking of the docking block 10 and the upper end of the vertical component 3.

[0044] Lifting stage: The lifting equipment continues to lift, and the lifting seat 6 drives the lifting rod 11 and the anti-sway cage 4 to rise synchronously. The guide sleeve 5 slides upward along the guide column 2 until the anti-sway cage 4 is completely separated from the guide column 2. During the entire lifting process, due to the cooperation and constraint between the guide column 2 and the guide sleeve 5, the vertical component 3 is restricted to move in the vertical direction and cannot produce pendulum-like swaying. The elastic clamping mechanism on the inner wall of the anti-sway cage 4 also provides auxiliary support for the vertical component 3, further improving stability.

[0045] Positioning and unhooking stage: The vertical component 3 is hoisted to the installation position and slowly lowered to dock with the installed node. After docking, the locking mechanism 12 is released (or the trigger mechanism is triggered by reverse operation) to separate the device from the upper end of the vertical component 3. The hook lifts the device away, completing one hoisting operation.

[0046] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A self-locking anti-sway guide device for hoisting truss components, characterized in that, include: The base is set on the installation surface or construction platform and is used to vertically place the truss components to be hoisted. A guide assembly, disposed on the base, is used to provide vertical guidance for the component to be hoisted; A lifting base, positioned above the guide assembly, is used for connection to lifting equipment; A locking mechanism is provided on the lifting base for automatically locking or releasing the lifting base to the upper end of the component to be lifted; The triggering mechanism is linked to the locking mechanism. The triggering mechanism triggers the locking mechanism to release during the lowering of the lifting equipment and triggers the locking mechanism to lock during the lifting of the lifting equipment.

2. The self-locking anti-sway guide device for hoisting truss components according to claim 1, characterized in that, The guiding assembly includes multiple guide posts and guide sleeves corresponding to each guide post. Each guide post is fixedly installed on the base, and each guide sleeve is fixedly installed on an anti-sway cage and slidably sleeved with the corresponding guide post. The anti-sway cage is sleeved on the outside of the component to be hoisted.

3. The self-locking anti-sway guide device for hoisting truss components according to claim 2, characterized in that, The anti-sway cage and the hoisting base are fixedly connected by multiple hoisting rods. The hoisting base is located above the anti-sway cage and moves synchronously with the anti-sway cage.

4. The self-locking anti-sway guide device for hoisting truss components according to claim 1, characterized in that, The upper end of the hoisting base is connected to a top plate via a connecting rod. The upper end of the top plate is provided with a sling for connecting to the hoisting equipment. The connecting rod is telescopic relative to the hoisting base. The triggering mechanism is located between the top plate and the locking mechanism.

5. The self-locking anti-sway guide device for hoisting truss components according to claim 4, characterized in that, The triggering mechanism includes a trigger rod and a rack disposed at the lower end of the trigger rod. The upper end of the trigger rod is fixedly connected to the top plate, and the rack meshes with the gear of the locking mechanism. When the top plate moves downward relative to the lifting base, the rack drives the gear to rotate in the forward direction to trigger the locking mechanism to release. When the top plate moves upward relative to the lifting base, the rack drives the gear to rotate in the reverse direction to trigger the locking mechanism to lock.

6. The self-locking anti-sway guide device for hoisting truss components according to claim 1, characterized in that, The locking mechanism includes a bearing seat, a movable ring, a bolt, and a gear. The bearing seat is fixedly installed on the lifting base. The movable ring is rotatably installed on the bearing seat and has an internal thread on its inner wall. The bolt is threadedly sleeved with the movable ring. The gear is sleeved on the outer circumference of the movable ring. The lower end of the lifting base is provided with a mating block that engages with the upper end of the component to be lifted. The bolt's screw end passes through a through hole in the side wall of the mating block and extends into the slot of the mating block.

7. The self-locking anti-sway guide device for hoisting truss components according to claim 6, characterized in that, There are two locking mechanisms, symmetrically distributed on both sides of the docking block. The number of triggering mechanisms is the same as the number of locking mechanisms and corresponds one-to-one, which is used to achieve bilateral symmetrical locking.

8. The self-locking anti-sway guide device for hoisting truss components according to claim 2, characterized in that, The inner wall of the anti-sway cage is provided with multiple elastic clamping mechanisms, each of which is used to elastically clamp the outer wall of the component to be hoisted to provide auxiliary stability.

9. The self-locking anti-sway guide device for hoisting truss components according to claim 6, characterized in that, The lower end of the docking block is provided with a slot that matches the upper end of the component to be hoisted. When the locking mechanism is in the locked state, the screw end of the bolt is inserted into the component hole at the upper end of the component to be hoisted.

10. The self-locking anti-sway guide device for hoisting truss components according to claim 1, characterized in that, The upper surface of the base is provided with a positioning structure, which is used to position the lower end of the component to be hoisted to prevent the component to be hoisted from tipping over.

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