CN113653304A - Steel pipe combined supporting structure and construction method thereof - Google Patents
Steel pipe combined supporting structure and construction method thereof Download PDFInfo
- Publication number
- CN113653304A CN113653304A CN202111126674.2A CN202111126674A CN113653304A CN 113653304 A CN113653304 A CN 113653304A CN 202111126674 A CN202111126674 A CN 202111126674A CN 113653304 A CN113653304 A CN 113653304A
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- steel pipe
- support
- combined
- rod
- connecting block
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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
- E04G1/00—Scaffolds primarily resting on the ground
- E04G1/17—Comprising essentially pre-assembled three-dimensional [3D] elements, e.g. cubic elements
-
- 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
- E04G7/00—Connections between parts of the scaffold
- E04G7/02—Connections between parts of the scaffold with separate coupling elements
- E04G7/06—Stiff scaffolding clamps for connecting scaffold members of common shape
- E04G7/24—Couplings involving arrangements covered by more than one of the subgroups E04G7/08, E04G7/12, E04G7/20, E04G7/22
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Joining Of Building Structures In Genera (AREA)
Abstract
本发明公开了一种钢管组合支撑结构及其施工方法，本发明包括若干间隔设置的组合钢管柱和连接在组合钢管柱上的若干支撑杆，所述组合钢管柱由若干钢管围成，所有组合钢管柱围成一个立体的支撑区域，所述支撑杆包括顶部支撑杆和侧面支撑杆，所述顶部支撑杆设置在支撑区域的顶部，所述侧面支撑杆设置在支撑区域的侧立面上。本发明的钢管支撑结构通过设置组合钢管柱进行支撑，组合钢管柱由若干钢管围成，其结构强度和支撑性要明显高于单根钢管，因此在设置时，组合钢管柱的之间的间距可以设置的更大，既能够满足支撑载荷的要求，稳定性和支撑性都更好，更加的间距可以使其具有一定的通过性。
The invention discloses a steel pipe composite support structure and a construction method thereof. The invention includes a plurality of composite steel pipe columns arranged at intervals and a plurality of support rods connected to the composite steel tube columns. The steel pipe column encloses a three-dimensional support area, the support rod includes a top support rod and a side support rod, the top support rod is arranged on the top of the support area, and the side support rod is arranged on the side elevation of the support area. The steel pipe support structure of the present invention is supported by arranging combined steel pipe columns. The combined steel pipe column is surrounded by several steel pipes, and its structural strength and support are significantly higher than that of a single steel pipe. Therefore, when setting, the distance between the combined steel pipe columns It can be set larger, which can not only meet the requirements of supporting loads, but also have better stability and support, and more spacing can make it passable.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a steel pipe combined supporting structure and a construction method thereof.
Background
At present, the support system of high and large formwork supporting engineering in building construction in China mostly adopts scaffold steel pipes, disc pin type frame bodies, disc buckle type and section steel supports to form a support system in a full scaffold form. And scaffold steel pipe, dish round pin formula support body, dish knot formula support system are because load or factor of height, and the pole setting interval is comparatively intensive, set up with the traffic difficulty, and stability is relatively poor, can't satisfy the construction demand.
Disclosure of Invention
The invention aims to overcome the defects, provides a steel pipe combined supporting structure, aims to overcome the defects of the traditional full hall scaffold, and provides a construction method for constructing the steel pipe combined supporting structure.
The technical scheme adopted by the invention is as follows:
the utility model provides a steel pipe combination bearing structure, includes a plurality of steel pipe columns of combination that the interval set up and connects a plurality of bracing pieces on the steel pipe column of combination, the steel pipe column of combination is enclosed by a plurality of steel pipes, and all combination steel pipe columns enclose into a three-dimensional support region, the bracing piece includes top support bar and side bracing piece, the top support bar sets up the top in the support region, the side bracing piece sets up on the side facade in support region.
As a further optimization, the combined steel pipe column comprises a plurality of steel pipes and a ring-shaped connecting seat used for enclosing the steel pipes into a ring shape, the ring-shaped connecting seat comprises a middle supporting part and a plurality of groups of first connecting pieces arranged on the middle supporting part at intervals, the middle supporting part is disc-shaped, all the first connecting pieces are arranged at intervals along the circumferential direction of the middle supporting part, each first connecting piece comprises a first connecting block and a second connecting block, the first connecting blocks and the second connecting blocks are W-shaped, the notches of the first connecting blocks and the second connecting blocks are used for clamping the steel pipes, the notches of the first connecting blocks and the second connecting blocks are arranged oppositely, and penetrate through the first connecting blocks, the second connecting blocks and the middle supporting part in sequence through bolts and are fixed through nuts.
As a further optimization, the middle supporting part comprises a disc and a ring sleeve fixedly arranged on the periphery of the disc, connecting holes are arranged at intervals in the circumferential direction of the ring sleeve, the first connecting block and the second connecting block are sequentially connected to the connecting holes of the ring sleeve through bolts, and two adjacent connecting holes on the ring sleeve are not located on the same plane.
As a further optimization, an extension connecting piece is further arranged between the two sections of steel pipes, the extension connecting piece is used for fixedly connecting the two sections of butted steel pipes, the extension connecting piece comprises two arc-shaped buckling plates, one ends of the two arc-shaped buckling plates are hinged, and the other ends of the two arc-shaped buckling plates are connected through bolts.
As a further optimization, the middle parts of the two arc-shaped pinch plates are provided with the baffle table for limiting the length of the steel pipe extending into the arc-shaped pinch plates.
As a further optimization, the lower end of the combined steel pipe column is provided with a support seat, the support seat comprises a bottom plate and a plurality of first connecting sleeves fixedly arranged on the bottom plate, the first connecting sleeves are annularly arranged on the bottom plate in rows and are matched with the arrangement positions of the steel pipes, and the inner diameter of each first connecting sleeve is matched with the outer diameter of each steel pipe.
As a further optimization, the top of the combined steel pipe column is provided with an upper connecting seat, the upper connecting seat comprises a top plate, a plurality of second connecting sleeves fixedly arranged on the top plate and a tensioning assembly for pre-adjusting the height, the tensioning assembly comprises a screw rod and two adjusting screw sleeves screwed on the screw rod, the nominal diameter of the screw rod is matched with the inner diameters of the second sleeves and the steel pipe, and two ends of the screw rod respectively extend into the second sleeves and the steel pipe and are limited by the adjusting screw sleeves.
As a further optimization, the upper end surface of the top plate is provided with a support rod pillow, the support rod pillow comprises a plurality of paired triangular irons, and V-shaped notches formed by the paired triangular irons are used for placing the top support rods.
As further optimization, the top support rod comprises a plurality of cross rods, longitudinal rods and bending rods, the side support rods comprise horizontal rods, vertical rods and scissors rods, and the intersection positions of the rod pieces are connected through fasteners.
The invention also provides a construction method of the steel pipe combined supporting structure, which comprises the following steps:
s1, determining the required specification number of the steel pipes according to the building height;
s2, building a combined steel pipe column: butting the steel pipes, enclosing the steel pipes into a ring shape, and fixing the steel pipes through a plurality of ring-shaped connecting seats;
s3, arranging the lower end of the combined steel pipe column on a supporting seat, and arranging an upper connecting seat at the upper end of the combined steel pipe column;
s4, after the combined steel pipe column is placed in place according to a set position, the height of the combined steel pipe column is initially adjusted through a tensioning assembly, and the rod pieces of the side supporting rods and the top supporting rods are sequentially connected to the combined steel pipe column through fasteners;
s5, a certain interaction force exists between the upper connecting seat and the steel pipe by adjusting the adjusting threaded sleeve on the upper connecting seat, and the supporting seat of the combined steel pipe column can be connected to the hardened ground through an earth anchor.
The invention has the following advantages:
1. the steel pipe supporting structure is supported by arranging the combined steel pipe columns, the combined steel pipe columns are surrounded by the plurality of steel pipes, and the structural strength and the supporting performance of the combined steel pipe columns are obviously higher than those of a single steel pipe, so that the space between the combined steel pipe columns can be set to be larger during arrangement, the requirement of supporting load can be met, the stability and the supporting performance are better, and the combined steel pipe columns can have certain trafficability;
2. the upper end of the combined steel pipe column is provided with the tensioning assembly, the tensioning assembly mainly comprises a screw rod and two adjusting threaded sleeves arranged on the screw rod, after all rod pieces are connected, the upper connecting seat can be lifted upwards and the steel pipe can be pressed downwards by rotating the threaded sleeves, so that the connection inside the supporting structure is more compact, and the stability of the supporting structure is better.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
The invention is further described below with reference to the accompanying drawings:
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a schematic perspective view of a composite steel pipe column;
FIG. 3 is an enlarged schematic view at A in FIG. 2;
FIG. 4 is an enlarged schematic view at B of FIG. 2;
fig. 5 is an enlarged schematic view at C in fig. 2.
Wherein: 1. the combined steel pipe column comprises a combined steel pipe column body, 2, side supporting rods, 3, a top supporting rod, 4, a horizontal rod, 5, a vertical rod, 6, a scissor rod, 7, a cross rod, 8, a bending rod, 9, a longitudinal rod, 10, an upper connecting seat, 11, a steel pipe, 12, an annular connecting seat, 13, an extension connecting piece, 14, a supporting seat, 15, triangular iron, 16, a top plate, 17, a second connecting sleeve, 18, a screw rod, 19, an adjusting screw sleeve, 20, a ring sleeve, 21, a disc, 22 and a first connecting piece.
Detailed Description
The present invention is further described in the following with reference to the drawings and the specific embodiments so that those skilled in the art can better understand the present invention and can implement the present invention, but the embodiments are not to be construed as limiting the present invention, and the embodiments and the technical features of the embodiments can be combined with each other without conflict.
It is to be understood that the terms first, second, and the like in the description of the embodiments of the invention are used for distinguishing between the descriptions and not necessarily for describing a sequential or chronological order. The "plurality" in the embodiment of the present invention means two or more.
The term "and/or" in the embodiment of the present invention is only an association relationship describing an associated object, and indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, B exists alone, and A and B exist at the same time. In addition, the character "/" herein generally indicates that the former and latter associated objects are in an "or" relationship.
The embodiment provides a steel pipe combined supporting structure, as shown in fig. 1, which includes a plurality of combined steel pipe columns 1 arranged at intervals and a plurality of supporting rods connected to the combined steel pipe columns 1, wherein the arrangement form of the combined steel pipe columns 1 can be arranged according to the specific supporting area, as shown in fig. 1, five groups of steel pipe columns 1 are arranged in the unit area of the combined steel pipe columns 1, and the five groups of combined steel pipe columns 1 are distributed in a scissor-type manner to ensure the supporting area and the supporting stability of the upper end, because the combined steel pipe columns 1 are surrounded by a plurality of steel pipes 11, the structural strength and the supporting stability of a single combined steel pipe column 1 are better, the distance between the single steel pipes of the spaced scaffold arranged on adjacent combined steel pipe columns 1 can be larger, and a certain passing requirement can be met, specifically, as shown in fig. 2, the combined steel pipe column 1 includes a plurality of steel pipes 11 and an annular connecting seat 12 for surrounding the steel pipes 11 into an annular shape, the annular connecting seats 12 are arranged in a plurality at intervals along the length direction of the steel pipe, as shown in fig. 4, each annular connecting seat 12 comprises a middle support part and a plurality of groups of first connecting pieces 22 arranged on the middle support rod at intervals, all the first connecting pieces are arranged at intervals along the circumferential direction of the middle support part, the middle support part is disc-shaped, each middle support part comprises a disc 21 and a ring sleeve 20 fixedly arranged on the periphery of the disc 21, connecting holes are arranged at intervals along the circumferential direction of the ring sleeve 20, each first connecting piece 22 comprises a first connecting block and a second connecting block, the first connecting block and the second connecting block are both W-shaped, notches of the first connecting block and the second connecting block are used for clamping the steel pipe 11, the notches of the first connecting block and the second connecting block are arranged oppositely, and pass through the first connecting block and the second connecting block in sequence through bolts and pass through the connecting holes on the ring sleeve 20, the tail of the bolt is fixed through a nut. In order to avoid interference between adjacent first connecting members 22 when the first connecting members 22 are installed, two adjacent connecting holes on the collar 20 are not located on the same horizontal plane, that is, two adjacent first connecting members 22 installed on the connecting holes are not located on the same horizontal plane. Because the length of steel pipe 11 may not reach the bearing height, need splice both ends steel pipe 11, two sections still be provided with extension connecting piece 13 between the steel pipe 11, extension connecting piece 13 is used for connecting two sections butt joint steel pipe 11 together, extension connecting piece 13 includes two arc buckle, and the one end of two arc buckle is articulated mutually, and the other end of two arc buckle is connected through the bolt, and length in order to let two sections steel pipe 11 connected stretch into extension connecting piece 13 is the same, two the middle part of arc buckle is provided with the fender platform, and two sections steel pipe 11 are when connecting, and the tip bumps the fender platform and can't stretch into again, guarantees that two sections steel pipe 11 stretch into length the same, avoids appearing one of them section steel pipe 11 and stretches into the length overlength, and the stability of connecting is guaranteed to another steel pipe 11 stretches into the too short problem of length. As shown in fig. 5, a support seat 14 is arranged at the lower end of the combined steel pipe column 1, the support seat 14 includes a bottom plate and a plurality of first connection sleeves fixedly arranged on the bottom plate, the connection sleeves are annularly arranged on the bottom plate in rows and are matched with the arrangement positions of the steel pipes, and the inner diameter of each first connection sleeve is matched with the outer diameter of the steel pipe 11. The top of the combined steel pipe column 1 is provided with an upper connecting seat, as shown in fig. 3, the upper connecting seat comprises a top plate 16, and a plurality of second connecting sleeves 17 and a tensioning assembly which are fixedly arranged on the top plate 16, the tensioning assembly comprises a screw rod 18 and two adjusting threaded sleeves 19 which are screwed on the screw rod 18, the nominal diameter of the screw rod 18 is matched with the inner diameters of the second connecting sleeves 17 and the steel pipe 11, and two ends of the screw rod 18 respectively extend into the second connecting sleeves 17 and the steel pipe 11 and are limited by the adjusting threaded sleeves 19. The upper end face of the top plate 16 is provided with a support rod pillow, the support rod pillow comprises a plurality of paired triangular irons 15, and a V-shaped groove formed by the triangular irons 15 is used for placing a top support rod.
In this embodiment, the support rods include a top support rod 3 disposed at the top and a side support rod 2 disposed at the side, the top support rod 3 is disposed at the top of the combined steel pipe column 1, the side support rod 2 is disposed on the side vertical surface of the adjacent combined steel pipe column 1, the top support rod 3 includes a plurality of cross rods 7, longitudinal rods 9 and bending rods 8, the cross rods 7 and the longitudinal rods 9 are both located on the horizontal plane, only different definitions of the orientation of the rod members are provided, the ends of the cross rods 7 or the longitudinal rods 9 are supported in the notches formed by the triangular iron at the upper end of the combined steel pipe column 1 and are connected to the combined steel pipe column 1 through the bending rods 8, specifically, one end of the bending rod 8 is connected to the steel pipe of the combined steel pipe column through a fastener, the other end of the bending rod 8 is connected to the cross rods 7 or the longitudinal rods 9, the side support rod includes a horizontal rod 4, a vertical rod 5 and a scissor rod 6, the two ends of the horizontal rod 4 are connected to the two adjacent combined steel pipe columns 1 through fasteners, the vertical rod 5 is connected to the horizontal rod 4 through fasteners, the scissor rod 6 is connected to the horizontal rod 4 or the vertical rod 5 through fasteners, and the upper ends of the rods of the side supporting rods 2 and the rods of the top supporting plate 3 are connected through fasteners at cross positions.
The embodiment also provides a construction method of the steel pipe combined supporting structure, which comprises the following steps:
s1, determining the required specification number of the steel pipes according to the building height;
s2, building a combined steel pipe column: butting the steel pipes, enclosing the steel pipes into a ring shape, and fixing the steel pipes through a plurality of ring-shaped connecting seats;
s3, arranging the lower end of the combined steel pipe column on a supporting seat, and arranging an upper connecting seat at the upper end of the combined steel pipe column;
s4, after the combined steel pipe column is placed in place according to a set position, the height of the combined steel pipe column is initially adjusted through a tensioning assembly, and the rod pieces of the side supporting rods and the top supporting rods are sequentially connected to the combined steel pipe column through fasteners;
s5, a certain interaction force exists between the upper connecting seat and the steel pipe by adjusting the adjusting threaded sleeve on the upper connecting seat, and the supporting seat of the combined steel pipe column can be connected to the hardened ground through an earth anchor.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (10)
1. The utility model provides a steel pipe combination bearing structure which characterized in that: the combined steel pipe column comprises a plurality of combined steel pipe columns arranged at intervals and a plurality of support rods connected to the combined steel pipe columns, wherein the combined steel pipe columns are surrounded by a plurality of steel pipes, a three-dimensional support area is surrounded by all the combined steel pipe columns, the support rods comprise top support rods and side support rods, the top support rods are arranged at the top of the support area, and the side support rods are arranged on side vertical faces of the support area.
2. The steel pipe combination support structure of claim 1, wherein: the combination steel-pipe column includes a plurality of steel pipes and is used for enclosing the steel pipe into annular cyclic annular connecting seat, cyclic annular connecting seat includes that intermediate strut portion and interval set up the first connecting piece of a plurality of groups on the intermediate strut portion, the intermediate strut portion is discoid, and all first connecting pieces set up along the circumference direction interval of intermediate strut portion, and first connecting piece includes first connecting block and second connecting block, first connecting block and second connecting block are W shape, and the notch of first connecting block and second connecting block is used for pressing from both sides tight steel pipe, and the notch of first connecting block and second connecting block sets up relatively to pass first connecting block, second connecting block and intermediate strut portion in proper order through the bolt, and fix through the nut.
3. The steel pipe combination support structure of claim 2, wherein: the middle supporting part comprises a disc and a ring sleeve fixedly arranged on the periphery of the disc, connecting holes are formed in the circumferential direction of the ring sleeve at intervals, the first connecting block and the second connecting block are sequentially connected to the connecting holes of the ring sleeve through bolts, and two adjacent connecting holes in the ring sleeve are not located on the same plane.
4. The steel pipe combination support structure of claim 2, wherein: the steel pipe butt joint structure is characterized in that an extension connecting piece is further arranged between the two steel pipes and used for fixedly connecting the two steel pipes which are in butt joint, the extension connecting piece comprises two arc-shaped buckling plates, one ends of the two arc-shaped buckling plates are hinged to each other, and the other ends of the two arc-shaped buckling plates are connected through bolts.
5. The steel pipe combination support structure of claim 4, wherein: and the middle parts of the two arc-shaped pinch plates are provided with baffle tables for limiting the length of the steel pipe stretching into the arc-shaped pinch plates.
6. The steel pipe combination support structure of claim 2, wherein: the lower extreme of combination steel-pipe column is provided with the supporting seat, the supporting seat includes bottom plate and fixed a plurality of adapter sleeve that sets up on the bottom plate, first adapter sleeve is cyclic annular branch and arranges on the bottom plate, and with the range position phase-match of steel pipe, the internal diameter of first adapter sleeve and the external diameter phase-match of steel pipe.
7. The steel pipe combination support structure of claim 2, wherein: the top of combination steel-pipe column is provided with the connecting seat, go up the connecting seat and include the roof, fix a plurality of second adapter sleeve and the tensioning subassembly that is used for the preset height that sets up on the roof, tensioning subassembly includes screw rod and two regulation swivel nuts of spiro union on the screw rod, the nominal diameter of screw rod and the internal diameter phase-match of second sleeve and steel pipe, the both ends of screw rod stretch into respectively in second sleeve and the steel pipe to carry on spacingly through adjusting the swivel nut.
8. The steel pipe combination support structure of claim 7, wherein: the support bar pillow is arranged on the upper end face of the top plate and comprises a plurality of paired triangular irons, and V-shaped notches formed by the paired triangular irons are used for placing the top support bars.
9. The steel pipe combination support structure of claim 1, wherein: the top support rod comprises a plurality of transverse rods, a longitudinal rod and a bending rod, the side support rod comprises a horizontal rod, a vertical rod and a shearing fork rod, and the intersection between the rod pieces is connected through a fastener.
10. A construction method of a steel pipe combined supporting structure is characterized by comprising the following steps: the method comprises the following steps:
s1, determining the required specification number of the steel pipes according to the building height;
s2, building a combined steel pipe column: butting the steel pipes, enclosing the steel pipes into a ring shape, and fixing the steel pipes through a plurality of ring-shaped connecting seats;
s3, arranging the lower end of the combined steel pipe column on a supporting seat, and arranging an upper connecting seat at the upper end of the combined steel pipe column;
s4, after the combined steel pipe column is placed in place according to a set position, the height of the combined steel pipe column is initially adjusted through a tensioning assembly, and the rod pieces of the side supporting rods and the top supporting rods are sequentially connected to the combined steel pipe column through fasteners;
s5, a certain interaction force exists between the upper connecting seat and the steel pipe by adjusting the adjusting threaded sleeve on the upper connecting seat, and the supporting seat of the combined steel pipe column can be connected to the hardened ground through an earth anchor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111126674.2A CN113653304A (en) | 2021-09-26 | 2021-09-26 | Steel pipe combined supporting structure and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111126674.2A CN113653304A (en) | 2021-09-26 | 2021-09-26 | Steel pipe combined supporting structure and construction method thereof |
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| CN113653304A true CN113653304A (en) | 2021-11-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111126674.2A Pending CN113653304A (en) | 2021-09-26 | 2021-09-26 | Steel pipe combined supporting structure and construction method thereof |
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| CN (1) | CN113653304A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118855219A (en) * | 2024-08-22 | 2024-10-29 | 中国建筑第八工程局有限公司 | Lattice support system and construction method for prefabricated floor slab without bottom formwork |
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| CN113047609A (en) * | 2021-03-19 | 2021-06-29 | 武汉建工集团股份有限公司 | Construction method for constructing super-thick concrete top plate by utilizing simple latticed column laminated slab system |
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| CN203175028U (en) * | 2013-04-12 | 2013-09-04 | 张俊杰 | Safe connecting device for steel pipe scaffold |
| CN203961295U (en) * | 2014-05-16 | 2014-11-26 | 中国建筑股份有限公司 | The two formulas of shooting down of adjusting of a kind of hollow lead screw are early torn supporting member open |
| CN204326505U (en) * | 2014-12-05 | 2015-05-13 | 浙江九恒建筑安全技术股份有限公司 | Hinge type is to clasp |
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| CN118855219A (en) * | 2024-08-22 | 2024-10-29 | 中国建筑第八工程局有限公司 | Lattice support system and construction method for prefabricated floor slab without bottom formwork |
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Application publication date: 20211116 |