CN211923466U - Elevator shaft regularization operation platform - Google Patents

Elevator shaft regularization operation platform Download PDF

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Publication number
CN211923466U
CN211923466U CN202020418267.3U CN202020418267U CN211923466U CN 211923466 U CN211923466 U CN 211923466U CN 202020418267 U CN202020418267 U CN 202020418267U CN 211923466 U CN211923466 U CN 211923466U
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China
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horizontal
elevator shaft
keels
platform
steel pipe
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CN202020418267.3U
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Inventor
李斌
张龙洋
李煜麟
段子龙
田晓航
张增旭
常耀峰
林作厚
胡祎一
邓智毅
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China Construction Second Engineering Bureau Co Ltd
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China Construction Second Engineering Bureau Co Ltd
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Abstract

The utility model provides an elevator shaft regularization operation platform, it is preceding to be to the direction towards elevator shaft door entrance to a cave, including the platform panel, horizontal skeleton, supporting framework and two at least lower side portion supports, the equal level setting of platform panel and horizontal skeleton just is the rectangle structure with elevator shaft inner wall cross section looks adaptation, the bottom welding of platform panel is on horizontal skeleton, the bottom of horizontal skeleton and the top welding of supporting framework, all lower side portion supports are along left right direction interval fixed connection in the front side lower part of supporting framework, the welding has the round steel rings that a plurality of passed platform panel on the horizontal skeleton, the back lateral part fixedly connected with of horizontal skeleton is at least two sets of adjustable bearing structure. The utility model discloses improved structure on traditional elevartor shaft operation platform's basis, increased side support and adjustable bearing structure down, it is firm to guarantee that operation platform is at elevator well internal fixation, has increased elevartor shaft protective structure moreover, and construction safety can have enough to meet the need the utilization, low cost.

Description

Elevator shaft regularization operation platform
Technical Field
The utility model relates to a building structure construction technical field, specifically speaking relates to an elevartor shaft regularization operation platform.
Background
The following modes are often adopted in the construction of the traditional elevator shaft structure: the method has the advantages that I-steel and steel pipes are large in input amount, later-stage I-steel and steel pipes are large in dismantling amount, dismantling safety risks are high, and workload of workers is large. Secondly, a lifting platform formed by shaping machining is adopted, but the limiting measures of the traditional shaping operation platform are not in place, the operation platform is easy to slip, loose and unstable, and certain potential safety hazards exist. And thirdly, a hydraulic lifting platform is adopted, and the method integrates a hydraulic system, has high manufacturing cost, needs professional special work operation, and is mainly used in a climbing formwork system of an ultra-high-rise elevator shaft and is not adopted in common high-rise buildings.
In order to solve the above problems, people are always seeking an ideal technical solution.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an elevartor shaft regularization operation platform, the utility model discloses improved structure has been carried out on traditional elevartor shaft operation platform's basis, has increased two lower side support and adjustable bearing structure, and it is firm to guarantee that operation platform is at elevator well internal fixation, has increased elevartor shaft protective structure moreover, and construction safety can have enough to meet the need the utilization, low cost.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides an elevator shaft regularization operation platform, it is preceding to be to the direction towards elevator shaft door entrance to a cave, including the platform panel, horizontal skeleton, supporting framework and two at least lower side portion supports, the equal level setting of platform panel and horizontal skeleton just is the rectangle structure with elevator shaft inner wall cross section looks adaptation, the bottom welding of platform panel is on horizontal skeleton, the bottom of horizontal skeleton and the top welding of supporting framework, all lower side portion supports all along controlling direction interval fixed connection in the front side lower part of supporting framework, the welding has the round steel rings that a plurality of passed platform panel on the horizontal skeleton, the back lateral part fixedly connected with of horizontal skeleton is at least two sets of adjustable bearing structure.
The platform panel is made of a pattern steel plate, the thickness of the platform panel is 1-6mm, and the length and the width of the platform panel are 100mm smaller than those of the cross section of the inner wall of the elevator shaft.
The horizontal framework comprises four cross beams, two first horizontal keels and three second horizontal keels, the four cross beams are welded end to form a rectangular framework, the length directions of the two first horizontal keels are arranged along the front and back directions, the two ends of the two first horizontal keels are respectively welded and fixed on the front and back cross beams, the length directions of the three second horizontal keels are arranged along the left and right directions, the two ends of the three second horizontal keels are respectively welded and fixed on the left and right cross beams, the bottom of the platform panel is welded and fixed on the rectangular framework, the round steel lifting rings are made of steel bars with the diameter of 25mm, the round steel lifting rings are of an L-shaped structure, the four round steel lifting rings are arranged, the two round steel lifting rings on the left side are respectively welded and fixed on the first horizontal keel on the left side, the two round steel lifting rings on the right side are respectively welded and, the center of this rectangle is located rectangular frame's center directly rear, and the top of four round steel rings passes the platform panel respectively and is located the top of platform panel, all welds on every second horizontal keel and has three spacing reinforcing bars of controlling equidistant and vertical setting side by side, and the top of each spacing reinforcing bar all passes the platform panel and is located the top of platform panel.
The supporting framework comprises two vertical keels and two oblique keels, the two vertical keels are arranged side by side left and right, the upper ends of the two vertical keels are respectively welded and fixed at the bottoms of the front ends of the two first horizontal keels, the two oblique keels are arranged side by side left and right, the lower ends of the two oblique keels are respectively welded and fixed at the rear side parts of the lower ends of the two vertical keels, the upper ends of the two oblique keels are respectively welded and fixed at the bottoms of the rear ends of the two first horizontal keels, a plurality of stabilizing beams are fixedly connected between the two oblique keels, the middle part of each oblique keel is respectively welded and fixed with the middle part of the vertical keel at the corresponding side, the middle part of the first horizontal keel at the corresponding side and the front side part, the two vertical keels, the two oblique keels, the rectangular frame and the reinforcing keels form a triangular truss supporting structure, the lower side support, lower side support includes horizontal right angle limit, perpendicular right angle limit and preceding low back high hypotenuse, and the rear end on the horizontal right angle limit of lower side support and the lower extreme fixed connection on perpendicular right angle limit, the perpendicular right angle limit of two lower side supports welded fastening respectively at the front side lower part of two vertical keels, and the horizontal right angle limit of two lower side supports is 200mm apart from the lower extreme of vertical keel.
Adjustable bearing structure is provided with two sets ofly, two sets of adjustable bearing structure are the same and control and set up the posterolateral part at two first horizontal keels respectively side by side, left adjustable bearing structure includes a direction steel pipe, coupling nut and supporting screw, the length direction of direction steel pipe sets up along the fore-and-aft direction level, direction steel pipe welded fastening is at the posterolateral part of left first horizontal keel, the rear end of direction steel pipe flushes with the rear end of first horizontal keel, coupling nut welded fastening is at the rear end and the shutoff direction steel pipe of direction steel pipe, supporting screw threaded connection is on coupling nut, the front end of supporting screw passes coupling nut and stretches into in the direction steel pipe, the fixed supporting backing plate that is equipped with the lateral wall behind the elevator well of supporting backing plate.
The utility model discloses still include and keep off sole and finished product protection net piece, fixedly connected with fixed beam between the lower lateral part of two vertical fossil fragments, the fixed beam just is located the below of the firm roof beam of downside with each firm roof beam parallel, the lower extreme of fixed beam apart from vertical fossil fragments is 200mm, keep off the sole and pass through rivet fixed connection on vertical fossil fragments, fixed beam and the firm roof beam of downside, finished product protection net piece welded fastening is on each firm roof beam of upside, the lower side of finished product protection net piece links up with the last side that keeps off the sole.
Two round steel rings of rear side are 500mm apart from the rear side of platform panel, two round steel rings of front side are located the middle part position between two round steel rings of rear side and the front side of platform panel, four round steel rings are skew elevator well door opening settings, spacing reinforcing bar's diameter is 25mm, spacing reinforcing bar's height is 100mm, vertical keel's length is 2600mm, crossbeam and fixed beam adopt 50mm x3 mm's angle steel, first horizontal keel, second horizontal keel and firm roof beam adopt No. 10 channel-section steel, the length on the perpendicular right angle limit of lower side support is 500mm, the length on the horizontal right angle limit of lower side support is 400mm, the diameter of direction steel pipe is phi 48mm x3 mm's steel pipe, the length of direction steel pipe is 200mm, the height of fender foot board is 200 mm.
An operation method of an elevator shaft sizing operation platform comprises the following steps:
(1) when the (N + 1) th floor in the elevator shaft is constructed, fixedly supporting the elevator shaft shaping operation platform at the Nth floor position in the elevator shaft, wherein N is an integer larger than 2;
(2) erecting a steel pipe scaffold on the elevator shaft shaping operation platform;
(3) arranging a soft protective structure on the Nth layer in the elevator shaft, arranging a hard horizontal protective structure on each layer below the Nth layer, and installing tool type protective doors on the vertical surfaces of elevator shaft door openings of the layers below the Nth layer;
(4) after the construction of the (N + 1) th floor in the elevator shaft is finished, removing the steel pipe scaffold and the soft protection, lifting the steel pipe scaffold away, lifting the elevator shaft shaping operation platform to the (N + 1) th floor in the elevator shaft, and fixedly supporting the elevator shaft shaping operation platform at the (N + 1) th floor in the elevator shaft;
(5) repeating the steps (2) and (3);
(6) and according to the steps, the construction of each layer of position in the elevator shaft is gradually completed from bottom to top.
The step (1) is specifically as follows: connecting the two round steel lifting rings on the left side and the two round steel lifting rings on the right side by using a steel wire rope with the diameter of 48mm respectively, clamping and fixing the two ends of the steel wire rope by using rope clamps respectively, and hanging the two steel wire ropes on a tower crane lifting hook, wherein the gravity center of the triangular truss supporting structure is deviated to one side of an elevator shaft door opening due to the two vertical keels, the two inclined keels, the rectangular frame and the reinforcing keels, the four round steel lifting rings are positioned on four vertexes of a rectangle, the center of the rectangle is positioned right behind the center of the rectangular frame, when the elevator shaft shaping operation platform is lifted upwards, the whole structure of the elevator shaft shaping operation platform is turned forwards and backwards to be in a state that the front part is low and the back part is high and inclined, and the two lower side supports can be backwards far away from the elevator shaft door opening and enter the inside of the elevator shaft, the elevator shaft shaping operation platform can keep a larger space distance with the inner wall of the elevator shaft, so that the elevator shaft shaping operation platform can be prevented from colliding with the inner wall of the elevator shaft when being lifted, the lifting is ensured to be stable and smooth, the elevator shaft shaping operation platform is lifted and lifted to the Nth floor position in the elevator shaft by the tower crane lifting, the bottoms of the two lower side part supports are higher than the lower floor structure beam of the Nth floor elevator shaft door opening, a worker ties the two lower side part supports through ropes at the Nth floor elevator shaft door opening, then the worker pulls the ropes outwards to keep the platform panel horizontal, then the tower crane lifting slowly lowers the elevator shaft shaping operation platform until the horizontal elevator shaft of the two lower side part supports press the lower floor structure beam of the Nth floor elevator shaft door opening, and the load of the shaping operation platform is transferred to the lower floor structure beam of the Nth floor elevator shaft door opening, finally, a worker goes onto the platform panel, rotates the two support screws to enable the two support screws to extend out of the two guide steel pipes, and the two support base plates are both pressed on the rear inner wall of the elevator shaft, so that the elevator shaft shaping operation platform can be fixedly supported at the Nth layer position in the elevator shaft;
the step (2) is specifically as follows: the vertical rods of the steel pipe scaffold are respectively and correspondingly inserted on the corresponding limiting reinforcing steel bars, the bottom of the steel pipe scaffold is provided with a longitudinal and transverse sweeping rod, the longitudinal and transverse sweeping rod is positioned above the platform panel and has a distance of 200mm, a wood template with the thickness of 16mm is paved on the longitudinal and transverse sweeping rod to be used as horizontal hard protection, erecting three-step longitudinal and transverse horizontal rods on the upper part of a steel pipe scaffold, wherein the step pitch is 1800mm, fully paving a steel fence mesh on an operation layer of the steel pipe scaffold to serve as a working platform for workers to stand, continuously arranging cross braces from the bottom to the top of upright rods on the left side and the right side of the steel pipe scaffold, welding adjustable supporting structures at the end parts of the longitudinal and transverse horizontal rods, the support base plates on the outer end parts of the support screw rods are supported and tightly pressed on the inner wall of the elevator shaft through adjusting the extending lengths of the support screw rods, so that the installation stability of the steel pipe scaffold is ensured;
the step (3) is specifically as follows: pre-burying a phi 63PVC sleeve on the left side wall and the right side wall of each layer of elevator shaft door opening in advance, pre-burying three phi 63PVC sleeves on a shear wall opposite to each layer of elevator shaft door opening, and ensuring that each phi 63PVC sleeve corresponding to the front and the back is on the same straight line so as to freely penetrate a longitudinal steel pipe into each phi 63PVC sleeve corresponding to the front and the back;
the soft protective structure is prepared by the following steps: the Nth position in the elevator well establishes one safe plain net, and safe plain net should firmly hang and establish on reliable atress components such as wall steel pipe, pre-buried couple, and the adjacent roof beam tether interval of safe plain net is not more than 750mm, and the clearance of safe plain net and elevator well inner wall is not more than 100mm, wherein: because the elevator shaft forming operation platform is positioned at the Nth-1 th layer in the elevator shaft when the elevator shaft forming operation platform is constructed at the Nth layer in the elevator shaft, when the elevator shaft forming operation platform is lifted to the Nth layer in the elevator shaft, phi 48x3.0 longitudinal steel pipes penetrate into the phi 63PVC sleeves at the Nth layer, the longitudinal steel pipes penetrating through the front and the rear shear walls are locked by fasteners, the rear end of the middle longitudinal steel pipe penetrates through the phi 63PVC sleeves on the shear wall opposite to the door opening of the Nth layer of elevator shaft, the front end of the middle longitudinal steel pipe is placed on the stabilizing beam at the lower side, the longitudinal steel pipes at the left and the right sequentially penetrate through the phi 63PVC sleeves on the left and the right side walls of the door opening of the Nth layer of elevator shaft and the phi 63PVC sleeves on the shear wall opposite to the door opening of the Nth layer of elevator shaft, and the front ends of the longitudinal steel pipes at the left and the right side extend out of the door, then, three transverse steel pipes are erected above the three longitudinal steel pipes, the three transverse steel pipes are fixedly connected with the three longitudinal steel pipes through fasteners, a layer of sponge is laid on the three transverse steel pipes, a plurality of pre-buried hooks are arranged on the periphery of the inner wall of an elevator shaft above the sponge, four side edges of the safety flat net are fixedly connected with the pre-buried hooks in a hanging mode to serve as a horizontal soft protection structure, the thickness of the sponge is larger than 10cm, the sponge is prevented from being damaged when the safety flat net falls down, and the pre-buried hooks are used for fixedly connecting the safety flat net;
the hard horizontal protective structure is prepared by the following steps: erecting a hard horizontal protection structure in each floor structure below the Nth floor in the elevator shaft, wherein the hard horizontal protection structure is erected by steel pipes, battens and wood templates; wherein, building MU7.5 lime-sand brick water retaining back ridges with the width of 100mm and the height of 200mm at elevator shaft door openings of each layer below the Nth layer, plastering 20mm by using M5 cement mortar, smearing fillets (R =50 mm) at the bottom internal corner, preventing water of corresponding floors from flowing into an elevator shaft through the elevator shaft door openings, penetrating a phi 48x3.0 longitudinal steel pipe into each phi 63PVC sleeve pipe in each layer of floor structure below the Nth layer in the elevator shaft, locking the longitudinal steel pipes penetrating through the front and the rear two shear walls by using fasteners, penetrating the rear end of the middle longitudinal steel pipe through the phi 63PVC sleeve pipes on the shear walls opposite to the elevator shaft door openings of each layer below the Nth layer, jacking the front end of the middle longitudinal steel pipe on the lime-sand brick water retaining back ridges, sequentially penetrating the longitudinal steel pipes on the left and the right sides through the left and the right side walls of the N layer of elevator shaft door openings and the 63 phi 63PVC sleeve pipes on the shear walls opposite to the N, the front ends of the longitudinal steel pipes on the left side and the right side extend out of an opening of an elevator shaft door of the Nth floor by a length not less than 150mm, then three transverse steel pipes are erected above the three longitudinal steel pipes, the three transverse steel pipes are fixedly connected with the three longitudinal steel pipes through fasteners, a plurality of 50x100 battens are longitudinally laid on each transverse steel pipe, the distance between each batten is 300mm, a wooden template with the thickness of 16mm is fully laid on each batten and one side of the elevator shaft door opening, and the thick wooden template and each corresponding batten are firmly pressed through nails, so that the elevator shaft is tightly sealed, and a hard horizontal protection structure is formed;
installing a tool type protective door on the vertical surface of the elevator shaft door opening of each layer below the Nth layer: the height of instrument formula guard gate is 1500mm, the high baseboard of 200mm of bottom installation of instrument formula guard gate, and the safety warning denoter that has written "fall in the mood for oneself" is opened hanging in the outside of instrument formula guard gate.
The step (4) is specifically as follows: when the elevator shaft shaping operation platform is ready to be lifted upwards from the Nth floor position in the elevator shaft, the safety flat net at the Nth floor position in the elevator shaft is taken down, the longitudinal steel pipe penetrating through the middle of the door opening of the elevator shaft at the Nth floor is temporarily drawn out, each adjustable supporting structure on the steel pipe scaffold is loosened, the whole structure of the steel pipe scaffold is lifted away by using a tower crane for hoisting, then the adjustable supporting structure on the elevator shaft shaping operation platform is loosened, the supporting screw rod is rotated to be screwed forwards into the guide steel pipe, the supporting base plate is tightly attached to the connecting nut, the same step (1) is carried out, the four hoisting rings are firmly connected by using the two steel wire ropes, the end parts of the two steel wire ropes are fixed by using the rope clamps, whether the steel wire ropes are tightened and stressed or not is noticed when in connection, whether the whole structure of the elevator shaft shaping operation platform is stable and, avoid wire rope length to differ to cause and promote the difficulty, the tower crane lifting hook hooks two wire rope, will through tower crane hoist and mount elevator well regularization operation platform hoist, and will elevator well regularization operation platform slowly promote to in the (N + 1) th elevator well, should keep in the hoisting process elevator well regularization operation platform's focus steady, work as elevator well regularization operation platform promote to in the (N + 1) th elevator well when, and the bottom of two lower side portion supports is higher than the lower floor structure roof beam of (N + 1) th elevator well door opening, the staff lives two lower side portion supports through the rope at (N + 1) th elevator well door opening, then the staff outwards draws the rope and makes platform panel keep the level, then tower crane hoist and mount slowly will elevator well regularization operation platform downwards, press at the lower floor structure roof beam of (N + 1) th elevator well door opening until the horizontal right angle limit of two lower side portion supports Transferring the load of the elevator shaft shaping operation platform to a floor structure beam at the lower side of an N +1 th elevator shaft door opening, finally, putting a worker on a platform panel, rotating two supporting screws to enable the two supporting screws to extend out of two guide steel pipes, pressing two supporting cushion plates on the rear inner wall of an elevator shaft, finally, similarly building a 100mm wide and 200mm high MU7.5 gray sand brick water retaining back ridge at the elevator shaft door opening at the Nth layer, inserting a longitudinal steel pipe passing through the middle of the elevator shaft door opening at the Nth layer in the elevator shaft, penetrating a phi 63PVC sleeve on a shear wall opposite to the elevator shaft door opening at the Nth layer at the rear end of the longitudinal steel pipe, pressing the front end of the longitudinal steel pipe on the corresponding gray sand brick water retaining back ridge, then erecting three transverse steel pipes above the three longitudinal steel pipes at the Nth layer in the elevator shaft, the elevator shaft is tightly sealed by adopting the method that three transverse steel pipes and three longitudinal steel pipes are fixedly connected by adopting fasteners, a plurality of 50x100 battens are longitudinally laid on each transverse steel pipe, the distance between each batten is 300mm, a wood template with the thickness of 16mm is fully paved on each batten and one side of an elevator shaft door opening, and the thick wood template and each corresponding batten are firmly pressed by nails, so that the elevator shaft is tightly sealed, and a hard horizontal protection structure is formed.
The utility model discloses relative prior art has substantive characteristics and progress, specifically speaking, the utility model has the following advantages:
(1) elevator shaft operation platform forms through materials processing such as channel-section steel, angle steel, steel sheet, reinforcing bar, steel pipe, adjustable support in this technique, and its selection of material is simple, and processing low cost through the improvement to traditional operation platform design method, has optimized the support mode, adopts the displacement that adjustable support can restrict the platform, plays the effect of reinforcing stability, and fail safe nature is further high, and it is convenient to promote.
(2) The horizontal protection method of elevator well among this technique is simple and practical, accords with standard requirement, and factor of safety is high, and workman's operation is also very convenient.
(3) The elevator shaft operating platform who adopts can have enough to meet the need the use many times, and this platform is assembled for field weld or bolted connection and forms, convenient and fast, and standardization level is high, can regard as the bright spot that the building site safety measure was used.
To sum up, the utility model discloses improved structure has been carried out on traditional elevartor shaft operation platform's basis, has increased side support and adjustable bearing structure down, and it is firm to guarantee that operation platform is at elevator well internal fixation, has increased elevartor shaft protective structure moreover, and construction safety can have enough to meet the need the utilization, low cost.
Drawings
Fig. 1 is a front view of the present invention.
Fig. 2 is a left side view of the present invention.
Fig. 3 is a structural sample drawing of the round steel hoisting ring of the utility model.
Fig. 4 is the welding schematic diagram of the round steel hanging ring and the first horizontal keel of the utility model.
Fig. 5 is a plan view of the present invention in an elevator hoistway.
Fig. 6 is a schematic sectional view of the construction in the elevator shaft.
Fig. 7 is a schematic diagram of the present invention when the nth floor position in the elevator shaft is ready for lifting.
Fig. 8 is a schematic diagram of the present invention when lifted to the (N + 1) th floor position in the hoistway.
Fig. 9 is a schematic view of the end structure of the wire rope according to the present invention.
Fig. 10 is a top view of a rigid horizontal guard structure in accordance with the present invention.
Fig. 11 is a left side view of the hard horizontal guard structure of the present invention.
Detailed Description
The embodiments of the present invention will be further explained with reference to the drawings.
As shown in fig. 1-11, an elevator shaft regularization operation platform, it is preceding to be the direction towards elevator shaft door entrance to a cave 18, including platform panel 1, horizontal skeleton, supporting framework and two at least lower side support 2, the equal level setting of platform panel 1 and horizontal skeleton just is the rectangle structure with elevator shaft inner wall cross section looks adaptation, the bottom welding of platform panel 1 is on horizontal skeleton, the bottom of horizontal skeleton and the top welding of supporting framework, all lower side support 2 all along controlling the direction interval fixed connection in the front side lower part of supporting framework, the welding has the round steel rings 3 that a plurality of passed platform panel 1 on the horizontal skeleton, the back lateral part fixedly connected with of horizontal skeleton has two sets of adjustable bearing structure at least.
The platform panel 1 is made of a pattern steel plate, the thickness of the platform panel 1 is 1-6mm, and the length and the width of the platform panel 1 are 100mm smaller than those of the cross section of the inner wall of the elevator hoistway 4.
The horizontal framework comprises four cross beams 5, two first horizontal keels 6 and three second horizontal keels 7, the four cross beams 5 are welded end to form a rectangular framework, the length direction of the two first horizontal keels 6 is arranged along the front-back direction, two ends of the two first horizontal keels 6 are respectively welded and fixed on the front-back two cross beams 5, the length direction of the three second horizontal keels 7 is arranged along the left-right direction, two ends of the three second horizontal keels 7 are respectively welded and fixed on the left-right two cross beams 5, the bottom of the platform panel 1 is welded and fixed on the rectangular framework, the round steel rings 3 are made of steel bars with the diameter of 25mm, the round steel rings 3 are in an L-shaped structure, four round steel rings 3 are arranged, the two round steel rings 3 on the left side are respectively welded and fixed on the first horizontal keel 6 on the left side, the two round steel rings 3 on the right, four round steel rings 3 are located four summits of a rectangle, and the center 33 of this rectangle is located the center of rectangular frame directly behind, and platform panel 1 is passed respectively and is located the top of platform panel 1 at the top of four round steel rings 3, all welds on every second horizontal keel 7 and has three spacing reinforcing bars 8 of controlling equidistant and vertical setting side by side, and platform panel 1 just is located the top of platform panel 1 is all passed at the top of each spacing reinforcing bar 8.
The supporting framework comprises two vertical keels 9 and two oblique keels 10, the two vertical keels 9 are arranged side by side from left to right, the upper ends of the two vertical keels 9 are respectively welded and fixed at the bottoms of the front ends of the two first horizontal keels 6, the two oblique keels 10 are arranged side by side from left to right, the lower ends of the two oblique keels 10 are respectively welded and fixed at the rear side parts of the lower ends of the two vertical keels 9, the upper ends of the two oblique keels 10 are respectively welded and fixed at the bottoms of the rear ends of the two first horizontal keels 6, a plurality of stabilizing beams 11 are fixedly connected between the two oblique keels 10, a reinforcing keel 12 is respectively welded and fixed between the middle part of each oblique keel 10 and the middle part of the vertical keel 9 at the corresponding side, the middle part of the first horizontal keel 6 at the corresponding side and the front side part, the two vertical keels, lower side support 2 is provided with two, lower side support 2 is the vertical setting of fore-and-aft direction along the plane of right angled triangle structure and place, lower side support 2 includes horizontal right angle limit, perpendicular right angle limit and the high hypotenuse in preceding low back, the rear end on horizontal right angle limit and the lower extreme fixed connection on perpendicular right angle limit of lower side support 2, the perpendicular right angle limit of two lower side supports 2 is welded fastening respectively at the front side downside of two vertical keels 9, the horizontal right angle limit of two lower side supports 2 is 200mm apart from the lower extreme of vertical keel 9.
The adjustable supporting structure is provided with two sets, two sets of adjustable supporting structures are the same and set up respectively in the posterolateral part of two first horizontal keel 6 side by side about and, left adjustable supporting structure includes a direction steel pipe 13, coupling nut 14 and supporting screw 15, the length direction of direction steel pipe 13 sets up along the fore-and-aft direction level, direction steel pipe 13 welded fastening is at the posterolateral part of left first horizontal keel 6, the rear end of direction steel pipe 13 flushes with the rear end of first horizontal keel 6, coupling nut 14 welded fastening is at the rear end of direction steel pipe 13 and shutoff direction steel pipe 13, supporting screw 15 threaded connection is on coupling nut 14, the front end of supporting screw 15 passes coupling nut 14 and stretches into in the direction steel pipe 13, the fixed supporting baseplate 34 that is on a parallel with elevator well 4 posterolateral wall that is equipped with of supporting screw 15.
The utility model discloses still include baseboard 16 and finished product protection net piece 17, fixedly connected with fixed beam between the lower side of two vertical fossil fragments 9, the fixed beam just is located the below of the firm roof beam 11 of downside with each firm roof beam 11 is parallel, the fixed beam is 200mm apart from the lower extreme of vertical fossil fragments 9, baseboard 16 passes through rivet fixed connection and is in vertical fossil fragments 9, fixed beam and the firm roof beam 11 of downside, finished product protection net piece 17 welded fastening is on each firm roof beam 11 of upside, finished product protection net piece 17's downside links up with baseboard 16's upside limit.
Two round steel rings 3 of rear side are 500mm apart from platform panel 1's rear side, two round steel rings 3 of front side are located the middle part position between two round steel rings 3 of rear side and platform panel 1's the front side, four round steel rings 3 skew elevator shaft door opening 18 sets up, spacing reinforcing bar 8's diameter is 25mm, spacing reinforcing bar 8's height is 100mm, vertical keel 9's length is 2600mm, crossbeam 5 and fixed beam adopt 50mm x3 mm's angle steel, first horizontal keel 6, second horizontal keel 7 and firm roof beam 11 adopt No. 10 channel-section steel, the length on lower side support 2's perpendicular right angle limit is 500mm, the length on lower side support 2's horizontal sole limit is 400mm, the diameter of direction steel pipe 13 is phi 48mm x3 mm's steel pipe, the length of direction steel pipe 13 is 200mm, the height of fender 16 is 200 mm.
An operation method of an elevator shaft sizing operation platform comprises the following steps:
(1) when the (N + 1) th floor in the elevator shaft 4 is constructed, fixedly supporting the elevator shaft shaping operation platform at the Nth floor position in the elevator shaft 4, wherein N is an integer larger than 2;
(2) erecting a steel pipe scaffold 19 on the elevator shaft shaping operation platform;
(3) arranging a soft protective structure on the Nth layer in the elevator shaft 4, arranging a hard horizontal protective structure on each layer below the Nth layer, and installing a tool type protective door 20 on the vertical surface of the elevator shaft door opening 18 of each layer below the Nth layer;
(4) after the construction of the (N + 1) th floor in the elevator shaft 4 is completed, dismantling the steel pipe scaffold 19 and the soft protection structure, lifting the steel pipe scaffold 19 away, then lifting the elevator shaft shaping operation platform to the (N + 1) th floor position in the elevator shaft 4, and fixedly supporting the elevator shaft shaping operation platform at the (N + 1) th floor position in the elevator shaft 4;
(5) repeating the steps (2) and (3);
(6) according to the above steps, the construction of each floor position in the elevator shaft 4 is completed step by step from bottom to top.
The step (1) is specifically as follows: the elevator shaft shaping operation platform is characterized in that a steel wire rope 21 with the diameter of 48mm is respectively used for connecting two round steel hanging rings 3 on the left side and two round steel hanging rings 3 on the right side, rope clamps 22 are used for clamping and fixing two ends of the steel wire rope 21 respectively, then the two steel wire ropes 21 are hung on a tower crane lifting hook, a triangular truss supporting structure is formed by two vertical keels 9, two inclined keels 10, a rectangular frame and reinforcing keels 12, the gravity center of the triangular truss supporting structure is deviated to one side of an elevator shaft door opening 18, the four round steel hanging rings 3 are positioned on four vertexes of a rectangle, the center 33 of the rectangle is positioned right behind the center of the rectangular frame, when the elevator shaft shaping operation platform is lifted upwards, the integral structure of the elevator shaft shaping operation platform is turned forwards and backwards to be in a state that the front part is low and the back part is high in a tilting state, and two lower side supports 2 can be far away from the elevator shaft, the elevator shaft shaping operation platform can keep a larger space distance with the inner wall of the elevator shaft 4, so that the elevator shaft shaping operation platform can be prevented from colliding with the inner wall of the elevator shaft 4 when being lifted, the lifting is ensured to be stable and smooth, the elevator shaft shaping operation platform is lifted and lifted to the Nth floor position in the elevator shaft 4 by the tower crane lifting, the bottoms of the two lower side supports 2 are higher than the lower floor structure beam of the Nth elevator shaft door opening 18, a worker ties the two lower side supports 2 through ropes at the Nth elevator shaft door opening 18, then the worker pulls the ropes outwards to keep the platform panel 1 horizontal, then the tower crane lifting slowly lowers the elevator shaft shaping operation platform until the horizontal edges of the two lower side supports 2 press the lower floor structure beam of the Nth elevator shaft right-angle door opening 18, the load of the elevator shaft shaping operation platform is transmitted to a lower floor structure beam of an Nth layer of elevator shaft door opening 18, finally, a worker goes onto the platform panel 1, the two support screws 15 are rotated to enable the two support screws 15 to extend out of the two guide steel pipes 13, and the two support base plates 34 are both pressed on the rear inner wall of the elevator shaft 4, so that the elevator shaft shaping operation platform can be fixedly supported at the Nth layer of position in the elevator shaft 4;
the step (2) is specifically as follows: the vertical rods of the steel pipe scaffold 19 are correspondingly inserted into the corresponding limiting reinforcing steel bars 8, the bottom of the steel pipe scaffold 19 is provided with a longitudinal and transverse floor sweeping rod 23, the longitudinal and transverse floor sweeping rod 23 is positioned above the platform panel 1 and has a distance of 200mm, a wood template 24 with the thickness of 16mm is laid on the longitudinal and transverse floor sweeping rod 23 to serve as horizontal hard protection, three steps of longitudinal and transverse horizontal rods 25 are erected on the upper portion of the steel pipe scaffold 19, the step pitch is 1800mm, a steel fence net 26 is fully laid on an operation layer of the steel pipe scaffold 19 to serve as a working platform for workers to stand on, scissor supports (not shown in the figure and in the conventional design) are continuously arranged from the bottom to the top of the vertical rods on the left side and the right side of the steel pipe scaffold 19, adjustable support structures are also welded on the end portions of the longitudinal and transverse horizontal rods 25, and the support base plates 34 on the outer end portions of the support screws 15 are supported and tightly pressed on the, thereby ensuring the installation stability of the steel pipe scaffold 19;
the step (3) is specifically as follows: pre-embedding a phi 63PVC sleeve (not shown in the figure and designed conventionally) on the left side wall and the right side wall of each elevator shaft door opening 18 in advance, pre-embedding three phi 63PVC sleeves on the opposite shear walls of each elevator shaft door opening 18 in advance, and ensuring that each phi 63PVC sleeve corresponding to the front part and the rear part is on the same straight line so as to freely penetrate a longitudinal steel pipe 27 into each phi 63PVC sleeve corresponding to the front part and the rear part, wherein the height of each phi 63PVC sleeve of a corresponding layer in the elevator shaft 4 from a structural slab on the lower side of the corresponding layer in the elevator shaft 4 is 150 mm;
the soft protective structure is prepared by the following steps: an Nth position in elevator well 4 establishes one safe plain net 28, safe plain net 28 should firmly hang and establish on reliable atress components such as wall-penetrating steel pipe, pre-buried couple, and safe plain net 28's adjacent roof beam system rope interval is not more than 750mm, and safe plain net 28 is not more than 100mm with the clearance of elevator well 4 inner wall, wherein: because the elevator shaft forming operation platform is positioned at the Nth layer-1 position in the elevator shaft 4 when the Nth layer in the elevator shaft 4 is constructed, when the elevator shaft forming operation platform is lifted to the Nth layer position in the elevator shaft 4, the phi 48x3.0 longitudinal steel pipe 27 is penetrated into each phi 63PVC sleeve pipe of the Nth layer, the longitudinal steel pipe 27 penetrating through the front and the back shearing walls is locked by the fastener 29, the rear end of the middle longitudinal steel pipe 27 penetrates through the phi 63PVC sleeve pipe on the shearing wall opposite to the Nth layer of the elevator shaft door opening 18, the front end of the middle longitudinal steel pipe 27 is placed on the stabilizing beam 11 at the lower side, the longitudinal steel pipes 27 at the left and the right sequentially penetrate through the phi 63PVC sleeve pipes on the left and the right side walls of the Nth layer of the elevator shaft door opening 18 and the phi 63PVC sleeve pipe on the shearing wall opposite to the Nth layer of the elevator shaft door opening 18, the front ends of the longitudinal steel pipes 27 at the left and the right side extend out of the Nth layer of the elevator shaft, then, three transverse steel pipes 30 are erected above the three longitudinal steel pipes 27, the three transverse steel pipes 30 are fixedly connected with the three longitudinal steel pipes 27 through fasteners 29, a layer of sponge 35 is laid on the three transverse steel pipes 30, a plurality of embedded hooks (not shown in the drawing and conventional design) are arranged on the periphery of the inner wall of the elevator shaft 4 above the sponge 35, four side edges of the safety flat net 28 are fixedly connected to the embedded hooks to serve as a horizontal soft protection structure, the thickness of the sponge 35 is larger than 10cm, the sponge 35 is prevented from being broken when the safety flat net 28 falls down, and the embedded hooks are used for fixedly connecting the safety flat net 28;
the hard horizontal protective structure is prepared by the following steps: a hard horizontal protection structure is erected in each floor structure below the Nth floor in the elevator hoistway 4, and the hard horizontal protection structure is erected by a longitudinal steel pipe 27, a transverse steel pipe 30, a batten 31 and a wood template 24; wherein MU7.5 lime-sand brick water retaining sill 32 with the width of 100mm and the height of 200mm is built at the elevator shaft door opening 18 of each layer below the Nth layer, M5 cement mortar is used for plastering for 20mm, the bottom internal corner is used for plastering fillet (R =50 mm), the water of the corresponding floor is prevented from flowing into the elevator shaft 4 through the elevator shaft door opening 18, in the floor structure of each layer below the Nth layer in the elevator shaft 4, a phi 48x3.0 longitudinal steel pipe 27 penetrates into each phi 63PVC sleeve, the longitudinal steel pipes 27 penetrating through the front and the rear shear walls are locked by using fasteners 29, the rear end of the middle longitudinal steel pipe 27 penetrates through the phi 63PVC sleeves on the shear walls opposite to the elevator shaft door opening 18 of each layer below the Nth layer, the front end of the middle longitudinal steel pipe 27 is pressed on the lime-sand brick water retaining sill 32, the longitudinal steel pipes 27 on the left side and the right side sequentially penetrate through the phi 63PVC sleeves on the left and the right side walls and the elevator shaft door opening 18 of the N layer below the elevator shaft door opening 18 of, the length that the front ends of the longitudinal steel pipes 27 on the left side and the right side extend out of the nth layer of elevator shaft door opening 18 is not less than 150mm, then three transverse steel pipes 30 are erected above the three longitudinal steel pipes 27, the three transverse steel pipes 30 are fixedly connected with the three longitudinal steel pipes 27 through fasteners 29, a plurality of 50x100 battens 31 are longitudinally laid on each transverse steel pipe 30, the distance between each batten 31 is 300mm, a 16mm thick wood template 24 is fully laid on each batten 31 and one side of the elevator shaft door opening 18, and the thick wood template 24 and each corresponding batten 31 are firmly pressed through nails, so that the elevator shaft 4 is tightly sealed, and a hard horizontal protection structure is formed;
and (3) installing a tool type protective door 20 at the vertical surface of the elevator shaft door hole 18 of the lower layer of the Nth layer: the height of the tool type protective door 20 is 1500mm, a skirting board (not shown) with the height of 200mm is installed at the bottom of the tool type protective door 20, and a safety warning sign board (conventional design, not shown) for 'falling when taking care of' is hung on the outer side of the tool type protective door 20.
The step (4) is specifically as follows: when the elevator shaft shaping operation platform is to be lifted from the Nth floor position in the elevator shaft 4, the safety flat net 28 at the Nth floor position in the elevator shaft 4 is taken down, the longitudinal steel pipe 27 passing through the middle of the elevator shaft door opening 18 at the Nth floor is temporarily drawn out, each adjustable supporting structure on the steel pipe scaffold 19 is loosened, the whole structure of the steel pipe scaffold 19 is lifted away by using a tower crane, then the adjustable supporting structure on the elevator shaft shaping operation platform is loosened, the supporting screw 15 is rotated to lead the supporting screw 15 to be screwed forwards into the guide steel pipe 13, the supporting base plate 34 is tightly attached to the connecting nut 14, the same step (1) is carried out, the four lifting rings are firmly connected by using the two steel wire ropes 21, the end parts of the two steel wire ropes 21 are fixed by using the rope clamps 22, whether the steel wire ropes 21 are tightened or not is noticed when in connection, whether the whole structure of the elevator shaft shaping operation platform is stable and the stress is uniform, avoiding the difficulty in lifting caused by different lengths of the steel wire ropes 21, hooking two steel wire ropes 21 by a tower crane lifting hook, lifting the elevator shaft shaping operation platform by the tower crane lifting hook, slowly lifting the elevator shaft shaping operation platform to the (N + 1) th layer position in the elevator shaft 4, keeping the gravity center of the elevator shaft shaping operation platform stable in the lifting process, when the elevator shaft shaping operation platform is lifted to the (N + 1) th layer position in the elevator shaft 4, and the bottoms of the two lower side supports 2 are higher than the lower floor structural beams of the (N + 1) th layer elevator shaft door opening 18, tying the two lower side supports 2 at the (N + 1) th layer elevator shaft door opening 18 through ropes by a worker, then pulling the ropes outwards to keep the platform panel 1 horizontal, and then slowly lowering the elevator shaft shaping operation platform by the lifting hook, until the horizontal right-angle sides of the two lower side supports 2 are pressed on the lower floor structure beam of the (N + 1) th elevator shaft door opening 18, the load of the elevator shaft shaping operation platform is transferred to the lower floor structure beam of the (N + 1) th elevator shaft door opening 18, finally, a worker goes up to the platform panel 1, two support screws 15 extend out of two guide steel pipes 13 by rotating the two support screws 15, two support backing plates 34 are both pressed on the rear inner wall of the elevator shaft 4, finally, a 100mm wide and 200mm high MU7.5 gray sand brick water-retaining back sill 32 is similarly built at the position of the Nth elevator shaft door opening 18, a longitudinal steel pipe 27 inserted through the middle of the Nth elevator shaft opening 18 at the Nth layer position in the elevator shaft 4 is inserted, the rear end of the longitudinal steel pipe 27 passes through a 63 phi shear sleeve on the opposite-face wall of the Nth elevator shaft door opening 18, the front end of the longitudinal steel pipe 27 is pressed on the corresponding sand brick water-retaining back 32, then, three transverse steel pipes 30 are erected above the three longitudinal steel pipes 27 at the Nth floor position in the elevator hoistway 4, the three transverse steel pipes 30 are fixedly connected with the three longitudinal steel pipes 27 through fasteners 29, a plurality of 50x100 battens 31 are longitudinally laid on each transverse steel pipe 30, the distance between each batten 31 is 300mm, a wooden template 24 with the thickness of 16mm is fully paved on each batten 31 and one side of the elevator hoistway door opening 18, and the thick wooden template 24 and each corresponding batten 31 are firmly pressed through nails, so that the elevator hoistway 4 is tightly sealed, and a hard horizontal protection structure is formed.
The utility model has the advantages of it is following:
(1) elevator shaft operation platform forms through materials processing such as channel-section steel, angle steel, steel sheet, reinforcing bar, steel pipe, adjustable support in this technique, and its selection of material is simple, and processing low cost through the improvement to traditional operation platform design method, has optimized the support mode, adopts the displacement that adjustable support can restrict the platform, plays the effect of reinforcing stability, and fail safe nature is further high, and it is convenient to promote.
(2) 4 horizontal protection methods of elevator well are simple and practical among this technique, accord with standard requirement, and factor of safety is high, and the workman operates also very conveniently.
(3) The elevator shaft operating platform who adopts can have enough to meet the need the use many times, and this platform is assembled for field weld or bolted connection and forms, convenient and fast, and standardization level is high, can regard as the bright spot that the building site safety measure was used.
To sum up, the utility model discloses improved structure has been carried out on traditional elevartor shaft operation platform's basis, has increased side support and adjustable bearing structure down, and it is firm to guarantee that operation platform is at elevator well internal fixation, has increased elevartor shaft protective structure moreover, and construction safety can have enough to meet the need the utilization, low cost.
The above embodiments are only used for illustrating but not limiting the technical solution of the present invention, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that; the present invention may be modified or substituted with equivalents without departing from the spirit and scope of the invention, which should be construed as being limited only by the claims.

Claims (7)

1. The utility model provides an elevator shaft regularization operation platform which characterized in that: towards the direction of elevartor shaft door entrance to a cave for preceding, including the platform panel, horizontal skeleton, supporting framework and two at least lower side support, the equal level setting of platform panel and horizontal skeleton just be the rectangle structure with elevator well inner wall cross section looks adaptation, the bottom welding of platform panel is on horizontal skeleton, the bottom of horizontal skeleton and supporting framework's top welding, all lower side support all along controlling direction interval fixed connection in supporting framework's front side lower part, the welding has the round steel rings that a plurality of passed the platform panel on the horizontal skeleton, the back lateral part fixedly connected with of horizontal skeleton has two sets of adjustable supporting structure at least.
2. The elevator shaft sizing operation platform of claim 1, wherein: the platform panel is made of a pattern steel plate, the thickness of the platform panel is 1-6mm, and the length and the width of the platform panel are 100mm smaller than those of the cross section of the inner wall of the elevator shaft.
3. The elevator shaft sizing operation platform of claim 2, wherein: the horizontal framework comprises four cross beams, two first horizontal keels and three second horizontal keels, the four cross beams are welded end to form a rectangular framework, the length directions of the two first horizontal keels are arranged along the front and back directions, the two ends of the two first horizontal keels are respectively welded and fixed on the front and back cross beams, the length directions of the three second horizontal keels are arranged along the left and right directions, the two ends of the three second horizontal keels are respectively welded and fixed on the left and right cross beams, the bottom of the platform panel is welded and fixed on the rectangular framework, the round steel lifting rings are made of steel bars with the diameter of 25mm, the round steel lifting rings are of an L-shaped structure, the four round steel lifting rings are arranged, the two round steel lifting rings on the left side are respectively welded and fixed on the first horizontal keel on the left side, the two round steel lifting rings on the right side are respectively welded and, the center of this rectangle is located rectangular frame's center directly rear, and the top of four round steel rings passes the platform panel respectively and is located the top of platform panel, all welds on every second horizontal keel and has three spacing reinforcing bars of controlling equidistant and vertical setting side by side, and the top of each spacing reinforcing bar all passes the platform panel and is located the top of platform panel.
4. The elevator shaft sizing operation platform of claim 3, wherein: the supporting framework comprises two vertical keels and two oblique keels, the two vertical keels are arranged side by side left and right, the upper ends of the two vertical keels are respectively welded and fixed at the bottoms of the front ends of the two first horizontal keels, the two oblique keels are arranged side by side left and right, the lower ends of the two oblique keels are respectively welded and fixed at the rear side parts of the lower ends of the two vertical keels, the upper ends of the two oblique keels are respectively welded and fixed at the bottoms of the rear ends of the two first horizontal keels, a plurality of stabilizing beams are fixedly connected between the two oblique keels, the middle part of each oblique keel is respectively welded and fixed with the middle part of the vertical keel at the corresponding side, the middle part of the first horizontal keel at the corresponding side and the front side part, the two vertical keels, the two oblique keels, the rectangular frame and the reinforcing keels form a triangular truss supporting structure, the lower side support, lower side support includes horizontal right angle limit, perpendicular right angle limit and preceding low back high hypotenuse, and the rear end on the horizontal right angle limit of lower side support and the lower extreme fixed connection on perpendicular right angle limit, the perpendicular right angle limit of two lower side supports welded fastening respectively at the front side lower part of two vertical keels, and the horizontal right angle limit of two lower side supports is 200mm apart from the lower extreme of vertical keel.
5. The elevator shaft sizing operation platform of claim 4, wherein: adjustable bearing structure is provided with two sets ofly, two sets of adjustable bearing structure are the same and control and set up the posterolateral part at two first horizontal keels respectively side by side, left adjustable bearing structure includes a direction steel pipe, coupling nut and supporting screw, the length direction of direction steel pipe sets up along the fore-and-aft direction level, direction steel pipe welded fastening is at the posterolateral part of left first horizontal keel, the rear end of direction steel pipe flushes with the rear end of first horizontal keel, coupling nut welded fastening is at the rear end and the shutoff direction steel pipe of direction steel pipe, supporting screw threaded connection is on coupling nut, the front end of supporting screw passes coupling nut and stretches into in the direction steel pipe, the fixed supporting backing plate that is equipped with the lateral wall behind the elevator well of supporting backing plate.
6. The elevator shaft sizing operation platform of claim 5, wherein: still include and keep off sole and finished product protection net piece, fixedly connected with fixed beam between the lower lateral part of two vertical keels, the fixed beam is parallel with each firm roof beam and is located the below of the firm roof beam of downside most, the lower extreme of fixed beam distance vertical keel is 200mm, it passes through rivet fixed connection at vertical keel to keep off the sole, fixed beam and the firm roof beam of downside most, finished product protection net piece welded fastening is on each firm roof beam of upside, the lower side of finished product protection net piece links up with the upside side that keeps off the sole.
7. The elevator shaft sizing operation platform of claim 6, wherein: two round steel rings of rear side are 500mm apart from the rear side of platform panel, two round steel rings of front side are located the middle part position between two round steel rings of rear side and the front side of platform panel, four round steel rings are skew elevator well door opening settings, spacing reinforcing bar's diameter is 25mm, spacing reinforcing bar's height is 100mm, vertical keel's length is 2600mm, crossbeam and fixed beam adopt 50mm x3 mm's angle steel, first horizontal keel, second horizontal keel and firm roof beam adopt No. 10 channel-section steel, the length on the perpendicular right angle limit of lower side support is 500mm, the length on the horizontal right angle limit of lower side support is 400mm, the diameter of direction steel pipe is phi 48mm x3 mm's steel pipe, the length of direction steel pipe is 200mm, the height of fender foot board is 200 mm.
CN202020418267.3U 2020-03-27 2020-03-27 Elevator shaft regularization operation platform Active CN211923466U (en)

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Application Number Priority Date Filing Date Title
CN202020418267.3U CN211923466U (en) 2020-03-27 2020-03-27 Elevator shaft regularization operation platform

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202020418267.3U CN211923466U (en) 2020-03-27 2020-03-27 Elevator shaft regularization operation platform

Publications (1)

Publication Number Publication Date
CN211923466U true CN211923466U (en) 2020-11-13

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