CN114687558A - Method for synchronously unloading structure by utilizing sandbox - Google Patents
Method for synchronously unloading structure by utilizing sandbox Download PDFInfo
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- CN114687558A CN114687558A CN202210371466.7A CN202210371466A CN114687558A CN 114687558 A CN114687558 A CN 114687558A CN 202210371466 A CN202210371466 A CN 202210371466A CN 114687558 A CN114687558 A CN 114687558A
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- bearing seat
- sandbox
- blocks
- groove
- pressure
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B7/00—Roofs; Roof construction with regard to insulation
Abstract
The invention relates to the technical field of roof net rack construction, and discloses a method for synchronously unloading a structure by utilizing a sandbox. The sandbox comprises a sandbox body, a pressure bearing seat protruding out of the top of the sandbox opening of the sandbox body and used for supporting the lower chord bolt ball and an action device. When the lower chord bolt ball falls onto the bearing seat, the action device is used for guiding the four positioning blocks to synchronously and radially move towards the center of the bearing seat to gather together so as to support the lower chord bolt ball. The sandbox adopted by the method for synchronously unloading the structure by utilizing the sandbox comprises a box body, a pressure bearing seat and an action device, when the lower chord bolt ball falls to the pressure bearing seat, the action device is used for guiding the four positioning blocks to synchronously and radially move towards the center of the pressure bearing seat to be gathered together so as to support the lower chord bolt ball, the stable sliding of the net rack blocks is ensured, the time and the labor are saved, and the construction efficiency is high.
Description
Technical Field
The invention relates to the technical field of roof net rack construction, in particular to a method for synchronously unloading a structure by utilizing a sandbox.
Background
The sandbox type temporary support is designed by utilizing the principle that dry fine sand in a closed container is easy to flow out when an opening is opened at the bottom or the side of the container, so that the volume of the fine sand in the container is reduced.
The unloading method mainly comprises the steps of firstly hoisting assembled net rack blocks to the upper side of the sandbox before the net rack blocks are placed, enabling lower chord bolt balls of corresponding supporting points on the net rack blocks to directly fall on the top of the sandbox, then additionally arranging temporary fixing measures and related tools between the lower chord bolt balls and the sandbox to ensure the stability of the process that the net rack blocks slide to the design position of the permanent support, before the net rack blocks are unloaded and placed, dismantling the temporary fixing measures and the related tools, finally discharging sand at an opening on the side face of the sandbox, reducing the volume of the sand in a container, and then enabling the net rack blocks to fall on the permanent support. The method is time-consuming and labor-consuming, low in construction efficiency and high in construction cost, and therefore a method for synchronously unloading the structure by using the sandbox is urgently needed.
Disclosure of Invention
The invention provides a method for synchronously unloading a structure by using a sandbox, and aims to solve the technical problems that in the process of unloading a net frame of a roof structure in blocks and dropping the net frame to a permanent support by using the sandbox in the prior art, a temporary fixing measure additionally arranged between a lower chord bolt ball and the sandbox and related tools are inconvenient to disassemble and assemble, time and labor are consumed, the construction efficiency is low, and the construction cost is high.
The invention is realized by adopting the following technical scheme: a method for synchronously unloading a structure by utilizing sandboxes comprises the following steps:
s1, building a temporary fixed support frame on the double-beam bridge type truss car and installing a sandbox on the support frame for synchronously unloading the net rack;
s2, hoisting the net rack blocks assembled on the ground in advance to a support frame, and enabling lower chord bolt balls at corresponding support points of the net rack blocks to fall on the sandbox; fixing four corners of the net rack block on the truss car by using guy cables;
s3, the net rack fixed on the support frame slides in blocks by drawing the truss vehicle;
s4, when the net rack blocks slide to the designed positions, opening a valve of the sandbox to unload and drop, and observing the drop stroke of the sandbox during the unloading process to ensure the synchronism of the unloading process until the net rack blocks drop on the permanent supports;
the sandbox comprises a sandbox body, a pressure bearing seat protruding out of the top of a sandbox opening of the sandbox body and used for supporting a lower chord bolt ball, and an action device, wherein four positioning blocks which extend in a radial inclined mode are circumferentially arranged on a pressure bearing face of the pressure bearing seat at equal intervals, and the height of one end, close to the center of the pressure bearing seat, of each positioning block is smaller than that of one end, far away from the center of the pressure bearing seat, of each positioning block;
when the lower chord bolt ball falls onto the pressure bearing seat, the action device is used for guiding the four positioning blocks to synchronously and radially move towards the center of the pressure bearing seat and gather together so as to support the lower chord bolt ball.
As a further improvement of the above, in step S3, the rack blocking slip speed is 0.5m/min or less.
As a further improvement of the above scheme, the bottom of the pressure bearing seat is connected with a plug plate matched with the inner wall of the box body through a connecting rod; and sand is accommodated between the bottom of the plug plate and the corresponding inner wall of the box body.
As a further improvement of the above scheme, the actuating device comprises a pressure lever vertically inserted into the top of the pressure-bearing seat in a sliding manner, a hollow cavity is formed in the pressure-bearing seat, a support plate is fixed in the hollow cavity, and a cylinder body coaxial with the pressure lever is rotatably inserted into the support plate; the top of the pressure lever protrudes out of the top of the pressure bearing seat, and the bottom of the pressure lever penetrates into the hollow cavity and is inserted into the inner side of the cylinder;
a spiral groove is distributed on the outer peripheral side of the pressure lever, and an ejector pin in sliding extrusion fit with the spiral groove is arranged on the inner side wall of the cylinder body; when the pressing rod moves downwards, the ejector pin moves along the extending direction of the groove body of the spiral groove, so that the cylinder body rotates in the circumferential direction;
a rotating disc positioned above the supporting plate is fixedly sleeved on the outer side of the barrel, and four limiting grooves I which are bent and extended towards the disc center are formed in the circumferential direction of the top surface of the rotating disc at equal intervals; a first limiting block is slidably clamped in the first limiting groove;
four radially extending limiting grooves II are circumferentially formed in the positions, corresponding to the four limiting grooves I, of the top of the pressure bearing seat, and the four limiting grooves II are respectively in one-to-one correspondence with the positions of the four positioning blocks; a second limiting block is slidably clamped in each second limiting groove;
the top of the second limiting block protrudes out of the top notch of the second limiting groove and is fixedly connected with the bottom of the corresponding positioning block; the bottom of the second limiting block is fixedly connected with the top of the corresponding first limiting block.
As a further improvement of the above scheme, a pressure bearing plate is arranged at the top of the pressure bearing rod, and a plate accommodating groove for accommodating the pressure bearing plate is formed in the top of the pressure bearing seat.
As a further improvement of the above scheme, a sliding groove communicated with the hollow cavity is formed at the bottom of the plate placing groove, a sliding block is connected in the sliding groove in a sliding manner, and a rod body of the pressure lever sequentially penetrates through the plate placing groove and the sliding groove and is fixedly inserted on the sliding block; a first spring is sleeved on the outer side of the compression bar, and two ends of the first spring are respectively connected to the bottom of the sliding block and the bottom of the groove wall of the sliding groove; when the first spring is not deformed, the sliding block is positioned at the top of the chute groove.
As a further improvement of the above scheme, the actuating device further comprises four fixed blocks, and the four fixed blocks are respectively arranged at the centrifugal ends of the four positioning blocks and are synchronous with the movement of the positioning blocks; a through groove is vertically formed in the positioning block, and a gear protruding out of a bottom groove opening of the through groove is mounted at the bottom groove opening of the through groove; a rack meshed with the gear is arranged at the top of the pressure bearing seat positioned in the moving direction of the fixed block; a first chain wheel synchronous with the gear in motion is coaxially arranged on the gear; the two sides of the notch at the top of the through groove are provided with lug blocks, a synchronizing shaft is rotatably arranged between the two lug blocks, the outer side of the synchronizing shaft is respectively fixedly sleeved with a second chain wheel and a clamping claw, and the second chain wheel is in transmission connection with the first chain wheel through a chain;
when the positioning block drives the fixing block to synchronously and centripetally move, the gear is forced to be meshed with the rack, and the clamping and holding claw is driven to rotate through the chain wheel I, the chain and the chain wheel II so as to clamp and hold the lower chord bolt ball.
As a further improvement of the above scheme, the clamping and holding claw includes a connecting section, one end of which is sleeved and fixed on the outer side of the synchronizing shaft, and the other end of the connecting section is provided with a holding section which is bent towards the center of the pressure bearing seat.
As a further improvement of the above scheme, the actuating device further comprises support sleeves oppositely arranged at the bottom of the inner cavity wall of the hollow cavity, clamping rods are horizontally inserted into the two support sleeves in a sliding manner, and rod through holes for the clamping rods to pass through are formed in the two side walls of the pressure bearing seat; both sides of the inner wall of the box opening of the box body are provided with rod supporting grooves for clamping and matching the clamping rods;
a fixed sleeve is fixedly sleeved on the outer side of the clamping rod between the rod through hole and the support sleeve, and a second spring is sleeved on the outer side of the clamping rod between the fixed sleeve and the support sleeve; when the second spring is not elastically deformed, the corresponding end part of the clamping rod protrudes out of the outer side of the pressure bearing seat;
the tops of the two clamping rod near ends are provided with a second inclined block, the bottom of the pressure rod penetrates out of the lower part of the cylinder body and is provided with a fixed plate, and the bottom of the fixed plate is oppositely provided with the first inclined blocks; two blocks two are positioned between the two blocks one;
when the pressing rod moves downwards, the two first inclined blocks respectively slide and extrude the two inclined planes of the two second inclined blocks through the first inclined planes, so that the two second inclined blocks drive the clamping rods to be close to each other, and the clamping state between the clamping rods and the rod supporting grooves is relieved.
As a further improvement of the above scheme, opposite sides of the two first inclined blocks are provided with first inclined surfaces which are inclined from bottom to bottom towards the middle of the fixing plate; the two inclined blocks II are provided with inclined planes II which incline towards the middle of the fixing plate from bottom to top.
The invention has the beneficial effects that:
the sandbox adopted by the method for synchronously unloading the structure by utilizing the sandbox comprises a box body, a pressure bearing seat and an action device, when the lower chord bolt ball falls to the pressure bearing seat, the action device is used for guiding the four positioning blocks to synchronously and radially move towards the center of the pressure bearing seat to gather together so as to support the lower chord bolt ball, the stable sliding of the net rack in blocks is ensured, the time and the labor are saved, the construction efficiency is high, and the construction cost can be effectively reduced.
The sandbox action device adopted by the method for synchronously unloading the structure by utilizing the sandbox further comprises a fixed block, a gear, a rack, a chain wheel synchronous shaft, a clamping claw and other structures, the clamping claw can synchronously clamp and hold the lower chord bolt ball when the positioning block moves centripetally, and the stability of the net rack during the block sliding is further improved.
Through the structures such as the clamping rod and the rod supporting groove, the pressure-bearing seat can be conveniently disassembled and assembled on the box body, sand in the box body is added and flattened, and the position of the pressure-bearing seat at the top of the box body is effectively kept when the pressure-bearing seat is not pressed, and meanwhile, the clamping support of the pressure-bearing seat can be automatically unlocked when the pressure-bearing seat is pressed, so that the pressure-bearing seat can drive the plug plate to relatively move in the box body through the connecting rod, and the pressure-bearing seat is safe and reliable.
Drawings
Fig. 1 is a schematic structural diagram of a sandbox in a method for performing structure-synchronous uninstallation by using the sandbox according to embodiment 2 of the present invention;
FIG. 2 is a schematic cross-sectional view of the sandbox of FIG. 1;
fig. 3 is a schematic cross-sectional view of the pressure-bearing seat in fig. 2;
FIG. 4 is a structural schematic view of the groove shape of the spiral groove of the drum body in FIG. 3 after the drum body is sheared and unfolded along the axis of the drum body;
FIG. 5 is a schematic top view of the turntable of FIG. 3;
fig. 6 is a schematic structural view of the pressure-bearing seat in fig. 3 from above;
fig. 7 is a schematic cross-sectional structural view illustrating a lower chord bolt ball falling on a sandbox in the method for synchronously unloading a structure using the sandbox according to embodiment 2 of the present invention;
FIG. 8 is an enlarged schematic view of the structure at A in FIG. 3;
fig. 9 is a schematic structural view of the clamping claw in fig. 6 mounted on the positioning block.
Description of the main symbols:
1. a box body; 2. a pressure bearing seat; 3. a plug plate; 4. a valve; 5. a connecting rod; 6. positioning a block; 7. a pressure bearing plate; 8. clamping claws; 81. a connecting section; 82. a holding section; 9. a pressure lever; 10. placing the plate in a groove; 11. a chute; 12. a slider; 13. a first spring; 14. a support plate; 15. a barrel; 16. a thimble; 17. a helical groove; 18. a turntable; 19. a first limiting groove; 20. a first limiting block; 21. a second limiting block; 22. a second limiting groove; 23. a fixed block; 24. a through groove; 25. a gear; 26. a rack; 27. a chain wheel I; 28. an ear piece; 29. a synchronizing shaft; 30. a second chain wheel; 31. a fixing plate; 32. a first inclined block; 33. a support sleeve; 34. a clamping rod; 35. a second inclined block; 36. perforating the rod; 37. fixing a sleeve; 38. a second spring; 39. a rod support slot; 40. and a hollow cavity.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
A method for synchronously unloading a structure by utilizing sandboxes comprises the following steps:
and S1, building a temporary fixed support frame on the double-beam bridge type truss car and installing a sandbox which is used for synchronously unloading the net racks on the support frame.
And S2, hoisting the net rack blocks assembled on the ground in advance to the support frame in a blocking manner, and enabling the lower chord bolt balls at the corresponding support points of the net rack blocks to fall on the sandbox. And four corners of the net rack block are fixed on the truss car by using the cable rope.
And S3, the net rack fixed on the support frame slides in blocks by drawing the truss vehicle.
And S4, when the net rack blocks slide to the designed positions, opening a valve of the sandbox to unload and drop, and observing the drop stroke of the sandbox during the unloading process to ensure the synchronism of the unloading process until the net rack blocks drop on the permanent supports.
In step S3, the slippage speed of the net rack block is less than or equal to 0.5m/min, and the stability of the slippage process of the net rack block is ensured.
Example 2
Referring to fig. 1 to 9, in this embodiment 2, a preferred embodiment of the embodiment 1 is shown, in which the sandbox includes a box body 1, a pressure-bearing seat 2 protruding from a top of a box opening of the box body 1 and used for supporting a lower-chord bolt ball, and an actuating device, four positioning blocks 6 extending in a radial inclined manner are circumferentially and equidistantly arranged on a pressure-bearing surface of the pressure-bearing seat 2, and a height of one end of each positioning block 6, which is close to a center of the pressure-bearing seat 2, is smaller than a height of one end of each positioning block, which is far from the center of the pressure-bearing seat 2.
Four lower chord members are arranged around the lower chord bolt ball in a cross shape in the embodiment, and the lower chord bolt ball is positioned in the center of the cross shape. When the lower chord bolt ball falls on the bearing seat 2, the positions of the four positioning blocks 6 are staggered with the positions of the four lower chords respectively, namely the four positioning blocks 6 are positioned in four intervals divided by the four lower chords respectively, so that the installation positions of the lower chords on the lower chord bolt ball are prevented from being interfered.
When the lower chord bolt ball falls onto the bearing seat 2, the action device is used for guiding the four positioning blocks 6 to synchronously and radially move towards the center of the bearing seat 2 to gather together so as to support the lower chord bolt ball, thereby being beneficial to stable falling of the lower chord bolt ball and avoiding the lower chord bolt ball from rolling or shaking.
The bottom of the pressure bearing seat 2 is connected with a plug plate 3 matched with the inner wall of the box body 1 through a connecting rod 5, and the plug plate 3 is in sliding sealing fit with the inner wall of the box body 1 in the embodiment. The outer side wall of the box body 1 is provided with a valve 4 which can be a manual valve or an electric control valve.
Sand is accommodated between the bottom of the plug plate 3 and the corresponding inner wall of the box body 1. Can extrude the husky material in the box 1 through cock board 3 to make husky material discharge box 1 through the valve, make the husky material plane in the box 1 sink, realize the position of falling of unloading to pressure-bearing seat 2.
The action device comprises a pressure rod 9 which is vertically inserted into the top of the pressure bearing seat 2 in a sliding manner, a hollow cavity 40 is formed in the pressure bearing seat 2, a supporting plate 14 is fixed in the hollow cavity 40, and a cylinder 15 which is coaxial with the pressure rod 9 is inserted into the supporting plate 14 in a rotating manner. The top of the pressure rod 9 protrudes out of the top of the pressure bearing seat 2, and the bottom of the pressure rod 9 penetrates into the hollow cavity 40 and is inserted into the inner side of the cylinder 15.
A spiral groove 17 is distributed on the outer periphery of the pressure lever 9, and an ejector pin 16 which is in sliding extrusion fit with the spiral groove 17 is arranged on the inner side wall of the cylinder 15. When the pressing rod 9 moves downwards, the thimble 16 moves along the extending direction of the groove body of the spiral groove 17 under the action of sliding friction force, so that the cylinder body 15 rotates circumferentially to drive the rotary disc 18 to rotate synchronously, and the first limiting groove 19 drives the first limiting block 20 to move towards the centripetal end in the centrifugal end in the groove body.
When the pressure lever 9 moves upwards under the action of the elastic force of the first spring 13, the thimble 16 moves along the extending direction of the groove body of the spiral groove 17 under the action of sliding friction force, so that the cylinder body 15 rotates in the circumferential direction in the opposite direction, the rotating disc 18 is driven to rotate in the synchronous opposite direction, and the first limiting groove 19 drives the centripetal end of the first limiting block 20 in the groove body to move towards the centrifugal end.
The outer side of the cylinder body 15 is fixedly sleeved with a rotating disc 18 positioned above the supporting plate 14, and four limiting grooves 19 which are bent and extended towards the disc center are formed in the circumferential direction of the top surface of the rotating disc 18 at equal intervals. The first limiting block 20 is slidably clamped in the first limiting groove 19. In this embodiment, the first limit groove 19 is an arc-shaped groove bending toward the center of the turntable 18.
Four radially extending limiting grooves two 22 are circumferentially arranged at the top of the pressure bearing seat 2 corresponding to the positions of the four limiting grooves one 19, the positions of the four limiting grooves one 19 correspond to the positions of the four limiting grooves two 22 one by one, and the positions of the four limiting grooves two 22 correspond to the positions of the four positioning blocks 6 one by one. And a second limiting block 21 is arranged in each second limiting groove 22 in a sliding and clamping manner.
The top of the second limiting block 21 protrudes out of the top notch of the second limiting groove 22 and is fixedly connected with the bottom of the corresponding positioning block 6. The bottom of the second limiting block 21 is fixedly connected with the top of the corresponding first limiting block 20.
In this embodiment, when the pressing rod 9 is not stressed, each of the positioning block 6 and the second limiting block 21 is located at the centrifugal end of the second limiting groove 22, and the first limiting block 20 is located at the centrifugal end of the first limiting groove 19, when the pressing rod 9 is stressed, each of the positioning block 6 and the second limiting block 21 moves towards the centripetal end of the second limiting groove 22, and the first limiting block 20 bends to move towards the centripetal end of the first limiting groove 19. The positioning block 6 is driven indirectly by the first limiting block 20, and the positioning block 6 moves relatively in the extending direction of the groove body of the second limiting groove 22 under the limiting action of the second limiting block 21.
The top of the pressure lever 9 is provided with a bearing plate 7, the top of the bearing seat 2 is provided with a plate groove 10 for accommodating the bearing plate 7, and the plate groove 10 can accommodate the bearing plate 7, so that the lowest end of the lower chord bolt ball and the bearing surface of the bearing seat 2 are on the same horizontal line, and the lower chord bolt ball can stably fall on the bearing seat 2.
The bottom of the plate groove 10 is provided with a sliding groove 11 communicated with the hollow cavity 40, the sliding groove 11 is connected with a sliding block 12 in a sliding way, and the rod body of the pressure rod 9 sequentially penetrates through the plate groove 10 and the sliding groove 11 and is fixedly inserted on the sliding block 12. The outer side of the pressure lever 9 is sleeved with a first spring 13, and two ends of the first spring 13 are connected to the bottom of the sliding block 12 and the bottom of the groove wall of the sliding groove 11 respectively. When the first spring 13 is not deformed, the sliding block 12 is positioned at the top of the groove of the sliding groove 11. The first spring 13 can help the press rod 9 to protrude to the top of the bearing seat 2 again and return to the initial position when the net rack is unloaded and dropped and the lower chord bolt ball does not press the bearing plate 7 any more.
The actuating device further comprises four fixing blocks 23, and the four fixing blocks 23 are respectively arranged at the centrifugal ends of the four positioning blocks 6 and are synchronous with the movement of the positioning blocks 6. The positioning block 6 is vertically provided with a through groove 24, and a gear 25 protruding out of the bottom groove of the through groove 24 is installed at the bottom groove. The rack 26 meshed with the gear 25 is arranged on the top of the pressure bearing seat 2 positioned in the moving direction of the fixed block 23, and the rack 26 is radially distributed on the top of the pressure bearing seat 2.
The gear 25 is coaxially provided with a first sprocket 27 which is synchronized with the movement thereof. Two sides of the top notch of the through groove 24 are provided with the lug blocks 28, a synchronizing shaft 29 is rotatably arranged between the two lug blocks 28, the outer side of the synchronizing shaft 29 is fixedly sleeved with the second chain wheel 30 and the clamping claw 8, and the synchronizing shaft 29, the second chain wheel 30 and the clamping claw 8 move synchronously. The second chain wheel 30 is connected with the first chain wheel 27 through a chain transmission.
Wherein, initially, the positioning block 6 and the fixing block 23 are both positioned at the centrifugal end of the second limit groove 22. When the positioning block 6 drives the fixing block 23 to synchronously and centripetally move, the gear 25 is forced to be meshed with the rack 26, the gear 25 rotates, and the clamping and holding claw 8 is synchronously driven to rotate towards the direction of the lower chord bolt ball through the chain wheel I27, the chain wheel II 30 and the synchronizing shaft 29 so as to clamp and hold the lower chord bolt ball. When the positioning block 6 drives the fixing block 23 to synchronously and centrifugally move, the gear 25 and the rack 26 are forced to be meshed with each other, the gear 25 reversely rotates, the clamping claws 8 are synchronously and reversely driven to rotate towards the direction far away from the lower chord bolt ball through the chain wheel I27, the chain wheel II 30 and the synchronizing shaft 29, clamping of the lower chord bolt ball is released, and the net rack is conveniently located on the permanent support in blocks.
The clamping and holding claw 8 comprises a connecting section 81, one end of which is sleeved and fixed on the outer side of the synchronizing shaft 29, and the other end of the connecting section 81 is provided with a holding section 82 which is bent towards the center of the pressure bearing seat 2. The connecting section 81 and the holding section 82 in the embodiment can be of an integrated structure, and the holding surface at the free end of the holding section 82 can be made of flexible materials, so that the lower chord bolt ball is prevented from being damaged.
The actuating device further comprises support sleeves 33 which are oppositely arranged at the bottom of the inner cavity wall of the hollow cavity 40, clamping rods 34 are horizontally inserted into the two support sleeves 33 in a sliding mode, and rod through holes 36 for the clamping rods 34 to penetrate through are formed in the two side walls of the pressure bearing seat 2. The two sides of the inner wall of the box opening of the box body 1 are provided with rod supporting grooves 39 for clamping and connecting the clamping rods 34. The rod brace groove 39 in this embodiment is an open groove, which facilitates the disassembly and assembly of the pressure-bearing seat 2 at the opening of the box body 1.
A fixed sleeve 37 is fixedly sleeved on the outer side of the clamping rod 34 between the rod through hole 36 and the support sleeve 33, and a second spring 38 is sleeved on the outer side of the clamping rod 34 between the fixed sleeve 37 and the support sleeve 33. When the second spring 38 is not elastically deformed, the corresponding end of the catch lever 34 protrudes outside the pressure bearing seat 2.
The top of the two clamping rods 34 near the ends is provided with a second inclined block 35, the bottom of the pressure rod 9 penetrates out of the lower part of the cylinder 15 and is provided with a fixing plate 31, and the bottom of the fixing plate 31 is provided with two first inclined blocks 32 oppositely. Two swash blocks two 35 are located between the two swash blocks one 32.
Opposite sides of the two first inclined blocks 32 are provided with first inclined surfaces (not labeled) inclined from below toward the middle of the fixing plate 31. The two inclined blocks 35 are provided with two inclined surfaces (not shown) which are inclined towards the middle of the fixing plate 31 from bottom to top.
When the pressing rod 9 moves downwards, the two first inclined blocks 32 respectively slide and extrude the two inclined planes of the two second inclined blocks 35 through the first inclined planes, so that the two second inclined blocks 35 drive the corresponding clamping rods 34 to approach each other, and the clamping state between the clamping rods 34 and the rod support grooves 39 is released.
In this embodiment, when the pressure-bearing seat 2 is installed at the top of the box body 1 and the pressure lever 9 is not pressed, the clamping rod 34 passes through the rod through hole 36 and extends into the rod supporting groove 39, so as to temporarily support the pressure-bearing seat 2 at the box opening, thereby ensuring that the pressure-bearing surface of the pressure-bearing seat 2 always protrudes out of the top of the box body 1, and meanwhile, the pressure-bearing seat 2 is conveniently dismounted before and after being used and added or pressed into the box body 1 due to the fact that the rod supporting groove 39 is opened. When the lower chord bolt ball falls on the bearing seat 2, the pressure lever 9 drives the fixed plate 31 and the first inclined block 32 to move downwards and slide to extrude the second inclined block 35, so that the two clamping rods 34 automatically retract into the rod through holes 36 and are separated from the corresponding rod supporting grooves 39, the position of the bearing seat 2 is automatically locked in a contact manner, and the bearing seat 2 can vertically move relatively in the box body 1, so that the pressure-bearing seat is safe and reliable.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method for synchronously unloading a structure by utilizing a sandbox is characterized by comprising the following steps:
s1, building a temporary fixed support frame and a sandbox which is arranged on the support frame and used for synchronously unloading the net rack on the double-beam bridge type truss truck;
s2, hoisting the net rack blocks assembled on the ground in advance to a support frame, and enabling lower chord bolt balls at corresponding support points of the net rack blocks to fall on the sandbox; fixing four corners of the net rack block on the truss car by using guy cables;
s3, the net rack fixed on the support frame slides in blocks by drawing the truss vehicle;
s4, when the net rack blocks slide to the designed positions, opening a valve of the sandbox to unload and drop, and observing the drop stroke of the sandbox during the unloading process to ensure the synchronism of the unloading process until the net rack blocks drop on the permanent supports;
the sandbox comprises a sandbox body, a pressure bearing seat protruding out of the top of a sandbox opening of the sandbox body and used for supporting a lower chord bolt ball, and an action device, wherein four positioning blocks which extend in a radial inclined mode are circumferentially arranged on a pressure bearing face of the pressure bearing seat at equal intervals, and the height of one end, close to the center of the pressure bearing seat, of each positioning block is smaller than that of one end, far away from the center of the pressure bearing seat, of each positioning block;
when the lower chord bolt ball falls onto the pressure bearing seat, the action device is used for guiding the four positioning blocks to synchronously and radially move towards the center of the pressure bearing seat and gather together so as to support the lower chord bolt ball.
2. A method for the simultaneous offloading of a structure using a sandbox as in claim 1 wherein in step S3 the rack blocking slip velocity is equal to or less than 0.5 m/min.
3. The method for the synchronized structural offloading of a sandbox according to claim 1, wherein the bottom of the pressure bearing seat is connected with a plug plate which is matched with the inner wall of the sandbox through a connecting rod; and sand is accommodated between the bottom of the plug plate and the corresponding inner wall of the box body.
4. The method for the synchronized structural offloading of a sandbox according to claim 1, wherein said actuating means comprises a pressure bar slidably inserted vertically into the top of said pressure-bearing seat, said pressure-bearing seat having a hollow cavity therein, a support plate fixed inside said hollow cavity, a cylinder coaxially inserted with said pressure bar rotatably inserted into said support plate; the top of the pressure lever protrudes out of the top of the pressure bearing seat, and the bottom of the pressure lever penetrates into the hollow cavity and is inserted into the inner side of the cylinder;
a spiral groove is distributed on the outer peripheral side of the pressure lever, and an ejector pin in sliding extrusion fit with the spiral groove is arranged on the inner side wall of the cylinder body; when the pressing rod moves downwards, the ejector pin moves along the extending direction of the groove body of the spiral groove, so that the cylinder body rotates in the circumferential direction;
a rotating disc positioned above the supporting plate is fixedly sleeved on the outer side of the barrel, and four limiting grooves I which are bent and extended towards the disc center are formed in the circumferential direction of the top surface of the rotating disc at equal intervals; a first limiting block is slidably clamped in the first limiting groove;
four radially extending limiting grooves II are circumferentially formed in the positions, corresponding to the four limiting grooves I, of the top of the pressure bearing seat, and the four limiting grooves II are respectively in one-to-one correspondence with the positions of the four positioning blocks; a second limiting block is slidably clamped in each second limiting groove;
the top of the second limiting block protrudes out of the top notch of the second limiting groove and is fixedly connected with the bottom of the corresponding positioning block; the bottom of the second limiting block is fixedly connected with the top of the corresponding first limiting block.
5. A method of synchronising unloading of a structure with a sandbox according to claim 4, wherein the top of the pressure bar is provided with a bearing plate and the top of the bearing seat is provided with a plate receiving slot for receiving the bearing plate.
6. The method of claim 5, wherein a sliding slot communicating with the hollow cavity is formed at the bottom of the plate-placing slot, a sliding block is slidably connected to the sliding slot, and a rod body of the compression bar sequentially penetrates through the plate-placing slot and the sliding slot and is fixedly inserted into the sliding block; a first spring is sleeved on the outer side of the compression bar, and two ends of the first spring are respectively connected to the bottom of the sliding block and the bottom of the groove wall of the sliding groove; when the first spring is not deformed, the sliding block is positioned at the top of the chute groove.
7. The method of claim 6, wherein the actuating device further comprises four fixed blocks, the four fixed blocks being disposed at the centrifugal ends of the four positioning blocks, respectively, and being synchronized with the movement of the positioning blocks; a through groove is vertically formed in the positioning block, and a gear protruding out of a bottom groove opening of the through groove is mounted at the bottom groove opening of the through groove; a rack meshed with the gear is arranged at the top of the pressure bearing seat positioned in the moving direction of the fixed block; a first chain wheel synchronous with the gear in motion is coaxially arranged on the gear; the two sides of the notch at the top of the through groove are provided with lug blocks, a synchronizing shaft is rotatably arranged between the two lug blocks, the outer side of the synchronizing shaft is respectively fixedly sleeved with a second chain wheel and a clamping claw, and the second chain wheel is in transmission connection with the first chain wheel through a chain;
when the positioning block drives the fixing block to synchronously and centripetally move, the gear is forced to be meshed with the rack, and the clamping and holding claw is driven to rotate through the first chain wheel, the second chain wheel and the chain wheel so as to clamp and hold the lower chord bolt ball.
8. The method for synchronously unloading a structure through a sandbox according to claim 7, wherein the clamping and holding claw comprises a connecting section, one end of the connecting section is fixedly sleeved outside the synchronizing shaft, and the other end of the connecting section is provided with a holding section which is bent towards the center of the pressure bearing seat.
9. The method for carrying out synchronous structure unloading by utilizing the sandbox as claimed in claim 6 or 8, wherein the actuating device further comprises support sleeves oppositely arranged at the bottom of the inner cavity wall of the hollow cavity, the two support sleeves are horizontally inserted with clamping rods in a sliding manner, and rod through holes for the clamping rods to pass through are respectively arranged on the two side walls of the pressure bearing seat; both sides of the inner wall of the box opening of the box body are provided with rod supporting grooves for clamping and matching the clamping rods;
a fixed sleeve is fixedly sleeved on the outer side of the clamping rod between the rod through hole and the support sleeve, and a second spring is sleeved on the outer side of the clamping rod between the fixed sleeve and the support sleeve; when the second spring is not elastically deformed, the corresponding end part of the clamping rod protrudes out of the outer side of the pressure bearing seat;
the tops of the two clamping rod near ends are provided with a second inclined block, the bottom of the pressure rod penetrates out of the lower part of the cylinder body and is provided with a fixed plate, and the bottom of the fixed plate is oppositely provided with the first inclined blocks; two blocks two are positioned between the two blocks one;
when the pressing rod moves downwards, the two first inclined blocks respectively slide and extrude the two inclined planes of the two second inclined blocks through the first inclined planes to enable the two second inclined blocks to drive the corresponding clamping rods to be close to each other, and the clamping state between the clamping rods and the rod supporting grooves is relieved.
10. A method of synchronising unloading of a structure with a sandbox as claimed in claim 9, wherein opposite sides of both of said first ramps have a first ramp sloping from below down towards the middle of said fixed panel; the two inclined blocks II are provided with inclined planes II which incline towards the middle of the fixing plate from bottom to top.
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| CN202210371466.7A CN114687558B (en) | 2022-04-11 | 2022-04-11 | Method for synchronous unloading of structure by utilizing sandbox |
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| CN114687558B (en) | 2023-06-16 |
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