CN114457957A - Prefabricated frame post and prefabricated building - Google Patents
Prefabricated frame post and prefabricated building Download PDFInfo
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- CN114457957A CN114457957A CN202011243580.9A CN202011243580A CN114457957A CN 114457957 A CN114457957 A CN 114457957A CN 202011243580 A CN202011243580 A CN 202011243580A CN 114457957 A CN114457957 A CN 114457957A
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- column
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- connecting frame
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 32
- 239000010959 steel Substances 0.000 claims abstract description 32
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims abstract description 9
- 230000003014 reinforcing effect Effects 0.000 claims description 14
- 239000007787 solid Substances 0.000 claims description 5
- 230000002787 reinforcement Effects 0.000 claims description 4
- 230000000712 assembly Effects 0.000 claims description 3
- 238000000429 assembly Methods 0.000 claims description 3
- 125000006850 spacer group Chemical group 0.000 claims description 2
- 238000001125 extrusion Methods 0.000 abstract description 6
- 238000001514 detection method Methods 0.000 description 7
- 238000009434 installation Methods 0.000 description 6
- 238000010008 shearing Methods 0.000 description 5
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 239000004567 concrete Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000009417 prefabrication Methods 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/30—Columns; Pillars; Struts
- E04C3/34—Columns; Pillars; Struts of concrete other stone-like material, with or without permanent form elements, with or without internal or external reinforcement, e.g. metal coverings
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
- E04C5/162—Connectors or means for connecting parts for reinforcements
- E04C5/163—Connectors or means for connecting parts for reinforcements the reinforcements running in one single direction
Abstract
The invention provides a prefabricated frame column and an assembly type building. The prefabricated frame column comprises a column body and a frame rib assembly, the frame rib assembly penetrates through the column body, two ends of the frame rib assembly extend to the outer side of the column body, one end extending to the outer side of the column body is an upper connecting frame, and the other end of the frame rib assembly is a lower connecting frame; the frame rib assembly comprises longitudinal ribs, U-shaped reinforcing steel bars and a plurality of first stirrups, and the longitudinal ribs are uniformly distributed along the periphery of the column body; the parts of the longitudinal ribs in the column body are connected through the first stirrups, and the upper connecting frame and the lower connecting frame are respectively arranged at the two ends extending to the outer side of the column body; the U-shaped steel bar is fixedly arranged inside the frame bar component through the first stirrup. Compared with the prior art, the prefabricated frame column provided by the invention can replace the connection of a traditional grouting sleeve or an extrusion sleeve, the connection mode has low positioning precision requirement, and a positioning steel plate is not required.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a prefabricated frame column and an assembly type building.
Background
The connection of the longitudinal steel bars of the prefabricated frame columns in the existing assembly type building is generally grouting sleeve connection or extrusion sleeve connection, firstly, when the prefabricated frame columns are produced in a factory, the sleeves need to be accurately positioned, and when the prefabricated frame columns leave the factory, positioning steel plates are needed to be attached to the sleeves so as to be convenient for on-site positioning and reserving the inserted bars, so that the construction cost is increased; the traditional prefabricated column has large weight, high requirements on a tower crane during site construction and hoisting, and difficult connection and alignment of an upper column and a lower column; needs to be operated by a professional grouting team, has higher requirements on occupational level and needs to record audio and video in the whole process; the positioning deviation of the steel bar and the sleeve can exist in the vertical steel bar, and the steel bar planting technology or direct scrapping of components is needed when the deviation is large, so that the construction period and the cost are seriously influenced; in later detection, the state has no reliable detection means, and can not accurately judge how dense the mortar meets the standard, and the general grouting material needs to reach C80, so that the cost is high. In conclusion, the grouting sleeve connection and the extrusion sleeve connection which are currently used for connecting the prefabricated frame columns in China have the problems of high production precision, high installation difficulty, incomplete detection means, limited specialized worker level and the like.
Disclosure of Invention
The invention aims to provide a prefabricated frame column and an assembly type building, which are connected by replacing a traditional grouting sleeve or an extrusion sleeve without attaching a positioning steel plate.
The technical scheme of the invention is as follows: a prefabricated frame column comprises a column body and a frame rib assembly, wherein the frame rib assembly penetrates through the column body, two ends of the frame rib assembly extend to the outer side of the column body, one end of the frame rib assembly, which extends to the outer side of the column body, is an upper connecting frame, and the other end of the frame rib assembly is a lower connecting frame; the frame rib assembly comprises longitudinal ribs, U-shaped reinforcing steel bars and a plurality of first stirrups, and the longitudinal ribs are uniformly distributed along the periphery of the column body; the longitudinal ribs penetrate through the positions in the column body and are connected through the first stirrups, and the first stirrups are distributed at intervals in the height direction of the column body; the two ends of the longitudinal rib extending to the outer side of the column body are respectively provided with the upper connecting frame and the lower connecting frame; the U-shaped steel bar is fixedly arranged in the frame bar component through the first stirrup, and the U-shaped steel bar extends into the lower connecting frame from the upper connecting frame.
In the above-mentioned scheme, through designing the U-shaped reinforcing bar, during the connection, with the U-shaped reinforcing bar left-hand thread anchor of two prefabricated frame posts, can replace traditional grout sleeve or extrusion muffjoint, need not subsidiary location steel sheet.
The height direction refers to the height of the prefabricated frame column after installation and is consistent with the height of a floor.
Preferably, the U-shaped steel bar is provided with a U-shaped opening through two connecting steel bars which are arranged at intervals and symmetrically; the connecting steel bar comprises an upper connecting part, a middle part and a lower connecting part which are sequentially connected, the upper connecting part is positioned in the upper connecting frame, and the middle part is positioned in the column body; the two connecting steel bars are arranged at intervals, so that the U-shaped opening of the U-shaped steel bar in the upper connecting frame is larger than the U-shaped opening of the U-shaped steel bar in the lower connecting frame.
The concrete structure of above-mentioned U-shaped reinforcing bar enables the U-shaped reinforcing bar of upper and lower floor to detain the installation more convenient, and the matching is higher. The symmetry axis of the connecting reinforcing steel bars is the center line of the height direction of the prefabricated frame column.
Preferably, the plurality of first stirrups are respectively sleeved on the periphery of the column body and are connected in a crisscross manner inside the column body.
The cup jointing ligature of periphery + inside cross ligature, this kind of modular fixed knot construct not only improve the atress performance of prefabricated frame post, still guarantee a plurality of effective fixings of indulging the muscle.
Preferably, the column body comprises a prefabricating area and a post-pouring area, the prefabricating area is arranged on the periphery of the column body, the post-pouring area is arranged in the middle of the column body, and the post-pouring area enables the column body to form a hollow column.
Among the above-mentioned scheme, be hollow column structure with the cylinder design, the hollow position of cylinder is the post-cast district, can alleviate self weight when the installation, and it is great to solve traditional precast column weight, and is higher to the requirement of tower crane during site operation hoist and mount, and makes the problem of prefabricated frame post counterpoint difficulty from top to bottom.
Preferably, the cylinder is a solid cylinder, a bent exhaust pipeline is arranged in the cylinder, the exhaust pipeline is close to the lower connecting frame, one end of the exhaust pipeline penetrates through the bottom of the cylinder, and the other end of the exhaust pipeline penetrates through the side wall of the cylinder.
In the scheme, the exhaust pipeline is designed on the column body of the solid column, so that exhaust is facilitated, and detection is also taken into consideration.
Preferably, the top of the upper connecting frame is provided with a pre-embedded hanging nail, the bottom of the lower connecting frame is recessed to form a shearing-resistant key groove, the two ends of the shearing-resistant key groove in the horizontal direction are communicated with each other on the column, and the exhaust pipeline is located in the middle of the shearing-resistant key groove.
Aiming at the solid column, the top of the column body is provided with a pre-buried hanging nail so as to ensure the convenience and accuracy of alignment during hoisting.
The invention also provides an assembly type building which comprises the prefabricated frame columns and the superposed beams in any one scheme, wherein the U-shaped steel bars of the upper connecting frames of the prefabricated frame columns on the lower layer are buckled with the U-shaped steel bars of the lower connecting frames of the prefabricated frame columns on the upper layer, and the superposed beams are horizontally arranged at the connecting positions of the frame bar assemblies of every two prefabricated frame columns.
Preferably, the upper connecting frame comprises a first connecting area and a second connecting area which are sequentially arranged from top to bottom, the first connecting area is connected with the prefabricated frame column on the upper layer, and the second connecting area is connected with the superposed beam.
Preferably, a cushion block is arranged between the bottom of the lower connecting frame of the prefabricated frame column and the top of the superposed beam.
Preferably, the joints of the upper connecting frame, the lower connecting frame and the superposed beam are all connected through a plurality of second stirrups, and the second stirrups are arranged at intervals along the height direction of the upper connecting frame.
Compared with the related technology, the invention has the beneficial effects that:
the prefabricated frame columns adopt longitudinally-arranged U-shaped steel bars, and longitudinal bars are combined, so that when the prefabricated frame columns are connected, the U-shaped steel bars of the two prefabricated frame columns are anchored and connected, the traditional grouting sleeve or extrusion sleeve connection can be replaced, the connection mode has low positioning precision requirement, and a positioning steel plate is not required;
the first connecting area is a post-pouring area, the fault-tolerant rate of steel bar connection is improved by reserving the area, and correction can be performed when the on-site steel bar positioning is not accurate;
thirdly, the U-shaped steel bars of the upper and lower layers of prefabricated frame columns are butted and buckled and bound by using second stirrups, and finally the prefabricated frame columns and the superposed beams are integrally cast, wherein the connection length of the longitudinal bars (the height of the prefabricated frame columns after installation) meets the requirements of the current specifications, the connection mode is safe and reliable, and the prefabricated frame columns are cast in situ equivalently;
and the first connecting area is a post-pouring area and is positioned at the floor, so that the on-site electric pipeline can be conveniently penetrated and connected, and the on-site plugging of the reserved threading holes is reduced.
Drawings
Fig. 1 is a schematic cross-sectional structure view of a prefabricated frame column according to a first embodiment of the present invention;
FIG. 2 is a top view of FIG. 1;
fig. 3 is a schematic cross-sectional structure view of a prefabricated building according to a first embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view of a prefabricated frame column according to a second embodiment of the present invention;
FIG. 5 is a top view of FIG. 4;
fig. 6 is a schematic cross-sectional structure view of a prefabricated building according to a second embodiment of the present invention.
In the attached drawings, 1-prefabricated frame column, 11-column body, 111-prefabricated area, 112-post-pouring area, 12-frame rib component, 121-upper connecting frame, 1211-first connecting area, 1212-second connecting area, 122-lower connecting frame, 123-longitudinal rib, 124-U-shaped steel bar, 1241-connecting steel bar, 1242-upper connecting part, 1243-middle part, 1244-lower connecting part, 125-first hoop, 2-superposed beam, 3-second hoop, 4-cushion block, 5-exhaust pipeline, 6-embedded hanging nail and 7-shear key slot.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. For convenience of description, the words "upper", "lower", "left" and "right" in the following description are used only to indicate the correspondence between the upper, lower, left and right directions of the drawings themselves, and do not limit the structure.
Example one
As shown in fig. 1 and 2, the present embodiment provides a prefabricated frame column 1 including a column body 11 and a frame rib assembly 12. The column 11 comprises a prefabrication area 111 and a post-pouring area 112, wherein the prefabrication area 111 is arranged on the periphery of the column 11, and the post-pouring area 112 is arranged in the middle of the column 11. As shown in fig. 3, the section of the column 11 is rectangular, the section of the post-cast area 112 is circular, and the post-cast area 112 makes the column 11 form a hollow column, which is cast together at a later stage. The thickness of the prefabricated area 111 is larger than or equal to 100mm, and the U-shaped steel bars can conveniently extend out.
The frame rib assembly 12 passes through the prefabricated area 111 of the column body 11, and both ends of the frame rib assembly 12 extend to the outer side of the column body 11. One end of the frame rib assembly 12 extending to the outside of the column 11 is an upper connecting frame 121, and the other end is a lower connecting frame 122.
The frame rib assembly 12 includes a longitudinal rib 123, a U-shaped reinforcing rib 124, and a plurality of first stirrups 125. The longitudinal ribs 123 are uniformly distributed along the periphery of the column 11. The longitudinal ribs 123 penetrate through the inside of the column body 11 and are connected by the first stirrups 125, and the first stirrups 125 are arranged at intervals along the height direction of the column body 11. The two ends of the longitudinal rib 123 extending to the outside of the column 11 are the upper connecting frame 121 and the lower connecting frame 122, respectively.
Further, four longitudinal ribs 123 are provided on each side of the column body 11, and a plurality of first stirrups 125 are respectively sleeved on the outer periphery of the column body 11, and four opposite longitudinal ribs 123 in the middle of each side are sleeved, thereby forming a crisscross connection structure (as shown in fig. 2).
The U-shaped reinforcement 124 is provided inside the column body 11 and fixed by a first stirrup 125 forming a cross.
The longitudinal ribs 123 and the U-shaped reinforcing ribs 124 extend from the upper coupling frame 121 into the lower coupling frame 122. The U-shaped reinforcing bar 124 has a U-shaped opening through two connecting reinforcing bars 1241 which are spaced and symmetrically arranged. The connecting reinforcement 1241 includes an upper connecting portion 1241, an intermediate portion 1242 and a lower connecting portion 1244 in sequence. The upper connection part 1242 is located in the upper connection frame 121, the middle part 1243 is located in the column 11, and the lower connection part 1244 is located in the lower connection frame 122. The two spaced apart connecting bars 1241 make the U-shaped opening of the U-shaped bar 124 in the upper connecting frame 121 larger than the U-shaped opening of the U-shaped bar 124 in the lower connecting frame 122. The U-shaped openings decrease in order from the upper connecting frame 121 to the lower connecting frame 122.
As shown in fig. 3, the present embodiment also provides a fabricated building including the prefabricated frame column 1, the superposed beam 2, the second stirrup 3 and the spacer 4.
The U-shaped reinforcing bars 124 of the upper connecting frames 121 of the prefabricated frame columns 1 on the lower layer are buckled with the U-shaped reinforcing bars 124 of the lower connecting frames 122 of the prefabricated frame columns 1 on the upper layer, i.e. the U-shaped reinforcing bars 124 of the lower connecting frames 121 are arranged inside the U-shaped reinforcing bars 124 of the upper connecting frames 121. The superposed beam 2 is horizontally arranged at the connecting position of the frame rib assemblies 12 of every two prefabricated frame columns 1. The horizontally arranged superposed beams 2 finally form a floor.
In a specific embodiment, the upper connection frame 121 includes a first connection region 1211 and a second connection region 1212 which are sequentially arranged from top to bottom. The height of the first connection region 1211 is 250 to 500mm, and it is matched with the lower connection frame 122. The first connection region 1211 is connected to the prefabricated frame column 1 on the upper layer, and the second connection region 1212 is connected to the composite beam 2. The U-shaped steel bars of the two layers of prefabricated frame columns 1 in the first connecting area 1211 are buckled with each other, then bound through the second stirrups 3, and finally integrally poured to form a whole, and the anchoring mode is safe and reliable and is equivalent to cast-in-place.
The first connecting area 1211 is a post-pouring area, the U-shaped steel bar is buckled in the post-pouring area, namely above the superposed beam 2, so that the buckling height of the U-shaped steel bar is calculated from the floor, the design is convenient for the on-site electric pipeline to penetrate through the pipe and be connected, and the on-site plugging of the reserved threading hole is reduced.
The first connecting area 1211 is a post-cast area, and is cast from the post-cast area 112 of the hollow column after the template is closed on site. Ordinary concrete or self-compaction concrete can be poured, and it is the same with traditional handicraft to pour technology, does not need professional industrialization workman, and the technical degree of difficulty is low, need not with the help of novel instrument, demolishs the template after, and closely knit degree is surveyable at a glance, and detection mode is the same with the detection mode of traditional cast-in-place frame post.
And a plurality of transverse ribs and stirrups for connecting the transverse ribs are arranged in the superposed beam 2. The transverse rib at the upper end of the laminated beam 2 is of a bent L-shaped structure, and the L-shaped transverse rib is arranged adjacent to the first connecting area 1211.
The height of the upper connection frame 121 is equal to the height of the lower connection frame 122 + the height of the superposed beam 2.
The joints of the upper connecting frame 121, the lower connecting frame 122 and the superposed beam 2 are all connected through a plurality of second stirrups 3. The plurality of second stirrups 3 are arranged at intervals in the height direction of the upper connection frame 121. And a cushion block 4 is arranged between the bottom of the lower connecting frame 122 and the top of the superposed beam 2.
Example two
As shown in fig. 4 to 6, the first embodiment is repeated, except that the column body 11 of the prefabricated frame column 1 provided by the present embodiment is a solid column. The bottom of cylinder 11 (being close to lower coupling frame 122) is equipped with exhaust duct 5, the top of cylinder 11 (being close to upper coupling frame 121) is equipped with pre-buried nail 6 that hangs.
The exhaust pipeline 5 is of a bent L-shaped structure, one end of the exhaust pipeline penetrates through the bottom of the column body 11, and the other end of the exhaust pipeline 1 penetrates through the side wall of the column body 11. The exhaust duct 5 is used for exhaust and detection. The bottom of the column 11 is also provided with a sunken shearing key groove 7, and the shearing key groove 7 is communicated with the two ends of the column diameter 11 in the horizontal direction. The exhaust duct 5 is located in the middle of the shear key groove 7.
The installation method of the fabricated building provided by the embodiment is the same as that of the first embodiment.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The prefabricated frame column is characterized by comprising a column body (11) and a frame rib assembly (12), wherein the frame rib assembly (12) penetrates through the column body (11), two ends of the frame rib assembly (12) extend to the outer side of the column body (11), one end, extending to the outer side of the column body (11), of the frame rib assembly (12) is an upper connecting frame (121), and the other end of the frame rib assembly is a lower connecting frame (122); the frame rib assembly (12) comprises longitudinal ribs (123), U-shaped reinforcing steel bars (124) and a plurality of first stirrups (125), and the longitudinal ribs (123) are uniformly distributed along the periphery of the column body (11); the longitudinal ribs (123) penetrate through the inner part of the column body (11) and are connected through the first stirrups (125), and the first stirrups (125) are arranged at intervals along the height direction of the column body (11); the two ends of the longitudinal rib (123) extending to the outer side of the column body (11) are respectively provided with the upper connecting frame (121) and the lower connecting frame (122); the U-shaped reinforcing steel bar (124) is fixedly arranged inside the frame bar assembly (12) through a first stirrup (125), and the U-shaped reinforcing steel bar (124) extends from the upper connecting frame (121) to the lower connecting frame (122).
2. Prefabricated frame column according to claim 1, characterized in that the U-shaped reinforcement (124) is provided with a U-shaped opening by means of two spaced and symmetrically arranged connecting reinforcements (1241); the connecting steel bar (1241) comprises an upper connecting part (1242), a middle part (1243) and a lower connecting part (1244), the upper connecting part (1242) is positioned in the upper connecting frame (121), and the middle part (1243) is positioned in the column body (11); the U-shaped openings of the U-shaped reinforcing steel bars (124) in the upper connecting frame (121) are larger than the U-shaped openings of the U-shaped reinforcing steel bars (124) in the lower connecting frame (122) due to the two connecting reinforcing steel bars (1241) which are arranged at intervals.
3. Prefabricated frame column according to claim 1, characterized in that a plurality of said first stirrups (125) are sleeved on the outer periphery of the column body (11) and crisscrossed inside the column body (11), respectively.
4. The prefabricated frame column of claim 1, wherein the column body (11) comprises a prefabricated area (111) and a post-cast area (112), the prefabricated area (111) is arranged at the periphery of the column body (11), the post-cast area (112) is arranged at the middle part of the column body (11), and the post-cast area (112) enables the column body (11) to form a hollow column.
5. Prefabricated frame column according to claim 1, characterized in that the column body (11) is a solid column, inside which a bent exhaust duct (5) is arranged, the exhaust duct (5) is arranged adjacent to the lower connecting frame (122), and one end of the exhaust duct (5) penetrates the bottom of the column body (11) and the other end of the exhaust duct (5) penetrates the side wall of the column body (11).
6. The prefabricated frame column as claimed in claim 5, wherein embedded hanging nails (6) are arranged in the top of the column body (11) close to the upper connecting frame (121), a shear-resistant key groove (7) is formed in the bottom of the column body (11) close to the lower connecting frame (122) in a recessed mode, two ends of the shear-resistant key groove (7) in the horizontal direction on the column body (11) are communicated, and the exhaust pipeline (5) is located in the middle of the shear-resistant key groove (7).
7. An assembled building, comprising a plurality of prefabricated frame columns (1) according to any one of claims 1 to 6 and superposed beams (2), wherein the U-shaped reinforcing bars (124) of the upper connecting frames (121) of the prefabricated frame columns (1) on the lower layer are buckled with the U-shaped reinforcing bars (124) of the lower connecting frames (122) of the prefabricated frame columns (1) on the upper layer, and the superposed beams (2) are horizontally arranged at the joint of the frame rib assemblies (12) of every two prefabricated frame columns (1).
8. Fabricated building according to claim 7, characterized in that said upper connection frame (121) comprises a first connection area (1211) and a second connection area (1212) arranged in sequence from top to bottom, said first connection area (1211) being connected to the prefabricated frame column (1) of the upper layer and said second connection area (1212) being connected to said superposed beam (2).
9. The fabricated building according to claim 8, wherein a spacer block (4) is provided between the bottom of the lower connecting frame (122) of the prefabricated frame column (1) and the top of the superposed beam (2).
10. The fabricated building according to claim 7, wherein the joints of the upper connecting frame (121), the lower connecting frame (122) and the superposed beams (2) are connected by a plurality of second stirrups (3), and the second stirrups (3) are arranged at intervals along the height direction of the upper connecting frame (121).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011243580.9A CN114457957A (en) | 2020-11-10 | 2020-11-10 | Prefabricated frame post and prefabricated building |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011243580.9A CN114457957A (en) | 2020-11-10 | 2020-11-10 | Prefabricated frame post and prefabricated building |
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| Publication Number | Publication Date |
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| CN114457957A true CN114457957A (en) | 2022-05-10 |
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| CN202011243580.9A Pending CN114457957A (en) | 2020-11-10 | 2020-11-10 | Prefabricated frame post and prefabricated building |
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