CN214942440U - High and large formwork support connecting structure - Google Patents
High and large formwork support connecting structure Download PDFInfo
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- CN214942440U CN214942440U CN202120604767.0U CN202120604767U CN214942440U CN 214942440 U CN214942440 U CN 214942440U CN 202120604767 U CN202120604767 U CN 202120604767U CN 214942440 U CN214942440 U CN 214942440U
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Abstract
The utility model discloses a tall and big template supports connection structure contains the basement braced system who connects between basement soleplate and basement top ground panel, connects braced system between floor and layer floor between the layer to and connect between basement braced system and floor, between the layer braced system respectively with girder, frame roof beam, the template system between the floor between the layer. The basement supporting system is favorable for ensuring the uniform stress and the integral bearing at the basement during the supporting process of the high and big template at the upper part of the basement; the arrangement of the interlayer supporting system is favorable for ensuring the template support of the interlayer floor slab, and the arrangement of the girder lower support and the frame beam lower support is favorable for supporting the bottom template of the girder and the frame beam; through the setting of frame roof beam lower stay transfer board and roof beam lower stay transfer piece, not only carry out the equipartition of effort and unite the lower part and correspond the top support and carry out the adaptability of height and adjust in the template bottom.
Description
Technical Field
The utility model belongs to the technical field of the construction, in particular to big template supports connection structure.
Background
Along with the development of society and economy, in order to meet different functional requirements, higher requirements are provided for the height and space utilization of buildings; such as a reporting hall for meeting requirements, a studio for meeting performance requirements, and a place for exhibition and visit. Because the demand of large-span, high headroom is higher and higher, establish also need carry out the design to the propping up of template when building structure construction, owing to the whole support design when having high big template. In the existing high formwork supporting process, the construction condition of a basement, the integral connection of a supporting structure, the adaptability adjustment of the supporting top and the formwork bottom and the like are lack of targeted design.
SUMMERY OF THE UTILITY MODEL
The utility model provides a high big template supports connection structure for support structure's wholeness, adaptability and the pertinence when having girder and basement in solving high big template design technical problem.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a tall and big template supporting and connecting structure comprises a basement supporting system connected between a basement foundation bottom plate and a basement top floor slab, an interlayer supporting system connected between the floor slab and an interlayer floor slab, and a template system connected between the basement supporting system and the floor slab, wherein the interlayer supporting system is respectively connected with a girder, a frame beam and the interlayer floor slab;
the interlayer supporting system comprises a layer vertical column connected between a floor slab and a floor slab, a layer horizontal transverse connecting rod and a layer horizontal secondary transverse connecting rod which are vertically connected to the layer vertical column at intervals, a layer base plate connected to the bottom of the layer vertical column, a girder lower support connected between the lower part of the girder and the floor slab, a frame girder lower support connected to the lower part of the frame girder, a floor lower support connected between the layer floor slab and the floor slab, and a cross support connected between the layer vertical columns.
Furthermore, the basement supporting system comprises a ground vertical post connected between the foundation bottom plate and the ground panel, a ground horizontal cross connecting rod and a ground horizontal secondary cross connecting rod which are vertically connected to the ground vertical post at intervals, a ground cushion plate connected to the bottom of the ground vertical post and a ground top support connected to the top of the ground vertical post;
the ground horizontal transverse connecting rod and the ground horizontal secondary transverse connecting rod surround to form a square frame or a rectangular frame, and one frame is arranged on one side away from the foundation bottom plate and one side away from the ground floor.
Furthermore, the girder lower support comprises a girder lower support main rod, a girder lower base plate connected between the bottom of the girder lower support main rod and the top of the ground panel, a girder lower support top support connected to the top of the girder lower support main rod, and a girder lower support adjusting block connected between the girder lower support top support and the girder; the height of the girder is not less than 3 m.
Further, the frame roof beam is propped down and is contained the frame roof beam and prop the mobile jib, connect the frame roof beam that props down at the mobile jib top under the frame and prop the top in the support, connect the frame roof beam that props down the mobile jib bottom under the frame and prop the backing plate under and connect the frame roof beam that props down between top support and the frame roof beam under the frame and prop the transfer plate.
Further, the frame beam lower support comprises a frame support adjusting rod penetrating through the frame beam lower support main rod, a frame support adjusting hoop connected to the outer side of the top of the frame beam lower support main rod and in threaded connection with the frame support adjusting rod, and a frame support body connected to the top of the frame support adjusting rod;
the roof beam props the top and holds in the palm the adjusting lever, connects in the roof beam props the roof beam that props the mobile jib top outside and threaded connection roof beam and props the top of propping the support adjusting lever and prop the top and hold in the palm the hoop and connect in the roof beam props the roof beam that props the top and hold in the palm the support body at the mobile jib top under the roof beam including cross-under the roof beam props the roof beam that props the mobile jib, the roof beam that props in the roof beam.
Furthermore, the beam support jacking body and the frame support jacking body are both U-shaped pieces, and the heights of two side edges of each U-shaped piece are not less than half of the heights of the corresponding beam lower support adjusting block and the corresponding frame beam lower support adjusting plate.
Furthermore, the layer horizontal transverse connecting rod and the layer horizontal secondary transverse connecting rod are encircled to form a square frame or a rectangular frame, and one frame is arranged on one side away from the ground floor and one side away from the interlayer floor;
the layer horizontal transverse connecting rods comprise layer horizontal transverse main connecting rods and layer horizontal connecting rods connected at the lower parts of the crossbeam and the frame beam, and the connection density of the layer horizontal connecting rods at the crossbeam is greater than that at the frame beam;
at least one suspension net is respectively arranged at the lower part of the girder and the lower part of the frame beam.
Further, the scissor supports are divided into full scissor supports, half scissor supports and partial scissor supports; the full cross braces are connected to the floor slab and the interlayer floor slab in the height range, the half cross braces are the cross braces arranged at the lower part of the crossbeam, and the local cross braces are the cross braces arranged at the positions with large stress in an encrypted manner.
Furthermore, displacement sensors and deformation sensors are installed at the connecting nodes of the rod pieces of the cross braces, the basement supporting system and the connecting nodes of the rod pieces of the interlayer supporting system, and the sensors are connected with the remote computer control early warning platform.
Furthermore, the template system comprises a ground plate template supported by the top of the basement supporting system, a girder template connected to the top of a girder lower support, and a floor plate template connected to the top of the interlayer supporting system; the floor slab template also comprises a floor slab template for pouring an interlayer floor slab and a frame beam template for pouring a frame beam; the template outside of template system is connected with flitch and back of the body stupefied, still connects in the bracing bolt and the both sides reinforced diagonal brace between the back of the body stupefied.
The beneficial effects of the utility model are embodied in:
1) the basement supporting system is favorable for ensuring the uniform stress and the integral bearing at the basement during the supporting process of the high and big template at the upper part of the basement;
2) the utility model is beneficial to the support of the template of the floor slab between the layers by arranging the interlayer support system, and is beneficial to the support of the bottom template of the girder and the frame beam by arranging the girder lower support and the frame beam lower support;
3) the utility model not only uniformly distributes acting force at the bottom of the template and combines the corresponding jacking at the lower part to adjust the adaptability of the height by arranging the frame beam lower support adjusting plate and the beam lower support adjusting block;
additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention; the primary objects and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description.
Drawings
FIG. 1 is a schematic view of a tall form support connection;
figure 2 is a schematic view of basement support system connections;
FIG. 3 is a schematic view of an inter-floor support system connection including girders;
FIG. 4 is a schematic view of the connection of the lower support system of the longerons;
FIG. 5 is a schematic plan view of a lower support system for the longerons;
figure 6 is a schematic view of the connection of the lower support system of the floor;
figure 7 is a plan view of the floor slab lower support system;
fig. 8 is a schematic view of a frame beam lower support jacking structure.
Reference numerals: 1-foundation slab, 2-basement supporting system, 21-ground vertical column, 22-ground horizontal cross connecting rod, 23-ground horizontal secondary cross connecting rod, 24-ground base plate, 25-ground top support, 3-ground plate, 4-interlayer supporting system, 41-layer vertical column, 42-layer horizontal cross connecting rod, 421-layer horizontal main connecting rod, 422-layer horizontal connecting rod, 43-layer horizontal secondary cross connecting rod, 44-layer base plate, 45-girder lower support, 451-girder lower support main rod, 452-girder lower support top support, 453-girder lower support adjusting block, 46-frame girder lower support, 461-frame girder lower support main rod, 462-frame girder lower support top support, 4621-frame support top support adjusting rod, 4622-frame support top support adjusting hoop, 4623-frame support top support supporting body, 463-frame girder lower support base plate, 463-frame girder lower support adjusting hoop, 464-frame beam lower support adjusting plate, 47-scissor support, 48-floor lower support, 5-suspension net, 6-girder, 7-frame beam, 8-interlayer floor, 9-template system, 91-floor template, 92-girder template, 93-floor template, 931-floor template, 932-frame beam template, 10-split bolt, 11-batten, 12-back ridge and 13-diagonal support.
Detailed Description
Taking a new residential and commercial service facility project as an example, an office building is provided with a basement and the first floor height is 11 m. Aiming at the template engineering and the supporting system, the height of the template is set up to be 8m or more; setting up span 18m or more; the total construction load is 15 kN/square meter and more; the concentrated line load is 20kN/m or more, belongs to partial project projects with larger dangerousness exceeding a certain scale, and a special technical scheme for supporting the template needs to be provided in a targeted manner.
As shown in fig. 1 to 8, the high formwork support connection structure is used to ensure the connection between the formwork to be poured and the corresponding support structure. The high formwork support connecting structure comprises a basement support system 2 connected between a basement foundation bottom plate 1 and a basement top floor plate 3, an interlayer support system 4 connected between the floor plate 3 and an interlayer floor slab 8, and a formwork system 9 connected between the basement support system 2 and the floor plate 3, wherein the interlayer support system 4 is respectively connected with a girder 6, a frame beam 7 and the interlayer floor slab 8.
In this embodiment, the formwork system 9 includes a floor slab formwork 91 supported by the top of the basement support system 2, a girder formwork 92 connected to the top of the girder 6 lower support 45, and a floor slab formwork 93 connected to the top of the interlayer support system 4; the floor slab formwork 93 further comprises a floor slab formwork 931 for casting the interlayer floor slab 8 and a frame beam formwork 932 for casting the frame beam 7; the outer side of the template system 9 is connected with a batten 11, back ridges 12, a split bolt 10 connected between the back ridges 12 and diagonal braces 13 reinforced at two sides.
In the embodiment, the templates are all made of laminated wood plywood with the thickness of 12mm, and the battens 11 are arranged along the length direction of the beam; the back edge 12 is arranged perpendicular to the beam direction; when the rod piece at the template is erected, the holding column and the wall connecting piece are required to be arranged.
As shown in fig. 2, the basement support system 2 includes a ground pillar 21 connected between the foundation slab 1 and the floor slab 3, a ground horizontal cross link 22 and a ground horizontal sub-cross link 23 vertically connected to the ground pillar 21 at intervals, a floor mat 24 connected to the bottom of the ground pillar 21, and a ground brace 25 connected to the top of the ground pillar 21. The horizontal connecting rod 22 and the horizontal secondary horizontal connecting rod 23 surround to form a square frame or a rectangular frame, and one frame is respectively arranged at one side of the foundation slab 1 and one side of the floor 3.
As shown in fig. 3 to 5, the interlayer support system 4 includes a layer vertical post 41 connected between the floor panel 3 and the interlayer floor panel 8, a layer horizontal cross link 42 and a layer horizontal sub cross link 43 vertically connected to the layer vertical post 41 at an interval, a layer pad 44 connected to the bottom of the layer vertical post 41, a girder 6 lower support 45 connected between the lower portion of the girder 6 and the floor panel 3, a frame beam 7 lower support 46 connected to the lower portion of the frame beam 7, a floor lower support 48 connected between the interlayer floor panel 8 and the floor panel 3, and a scissor support 47 connected between the layer vertical posts 41.
In this embodiment, the distance between the vertical column 41 of the plate edge layer and the edge of the structure is not greater than 300mm, and the distance between the vertical column of the plate edge layer and the side edge of the beam is not greater than 150 mm. The joints of the layer vertical columns 41 must be butted by using butt fasteners, and the butt lap joint meets the following requirements: the butt-joint fasteners on the vertical columns 41 of the layers are arranged in a staggered mode, the joints of the vertical columns 41 of two adjacent layers are not arranged in a synchronous span, the joints of the vertical columns 41 of the two adjacent layers are not in the same step pitch, and the distance between the center of each joint and the main node is not greater than 1/3 of the step pitch.
In this embodiment, the girder 6 lower support 45 includes a girder lower support main rod 451, a girder lower pad connected between the bottom of the girder lower support main rod 451 and the top of the floor panel 3, a girder lower support top 452 connected to the top of the girder lower support main rod 451, and a girder lower support adjustment block 453 connected between the girder lower support top 452 and the girder 6; the height of the girder 6 is not less than 3 m.
In this embodiment, the layer horizontal transverse connecting rod 42 is arranged below the layer horizontal secondary transverse connecting rod 43 and fastened with the layer vertical post 41 by a right-angle fastener, and the length of the layer horizontal transverse main connecting rod 421 is not preferably less than 4500 mm; the horizontal main connecting rod 421 of layer level is elongated and is preferentially connected by butt joint fasteners, and can be lapped when being limited by length, wherein the lapping length is not less than 1m, and is not less than 3 fasteners. The horizontal deviation of the horizontal cross connecting rods 42 of the same row of layers is not more than 1/250 of the total length of the scaffold and is not more than 50 mm. Two ends of the layer horizontal secondary transverse connecting rod 43 are fixed on the layer horizontal transverse connecting rod 42 or the layer vertical post 41 by adopting a right-angle fastener; the junction of each main node, namely the layer vertical column 41 and the layer horizontal transverse main connecting rod 421, must be provided with a layer of horizontal secondary transverse connecting rods 43, and fastened on the layer horizontal transverse main connecting rod 421 by adopting a right-angle fastener, the distance of the axis of the rod deviating from the main node should not be more than 150mm, the overhanging length is preferably 100mm, the layer horizontal secondary transverse connecting rods 43 at the non-main node position on the operation layer should be arranged at equal intervals according to the requirement of supporting the scaffold board, the maximum interval should not be more than 1/2 of the interval of the vertical rods, so that the overhanging length of the scaffold board is not more than 150 mm. The tier horizontal secondary cross links 43 are strictly all on the same side of the tier upstands 41, beginning from the middle of the support frame. The horizontal secondary horizontal connecting rod 43 of the layer adopts a whole steel pipe as much as possible, and butt joint is preferably adopted when extension is needed.
In this embodiment, the under beam supporting base 452 includes a beam supporting base adjusting rod penetrating the under beam supporting main rod 451, a beam supporting base adjusting hoop connected to the outside of the top of the under beam supporting main rod 451 and threadedly connected to the beam supporting base adjusting rod, and a beam supporting base body connected to the top of the beam supporting base adjusting rod.
In this embodiment, the beam support jacking body and the frame support jacking body 4623 are both U-shaped pieces, and the heights of both sides of each U-shaped piece are not less than half of the heights of the corresponding beam lower support adjusting block 453 and frame beam lower support adjusting plate 464. The lower beam supporting and adjusting block 453 and the lower frame beam supporting and adjusting plate 464 are made of wood or steel, the lower beam supporting and adjusting block 453 and the lower frame beam supporting and adjusting plate 464 are arranged in the same direction with the back ridge 12, and the frame body of the next floor is suitable to correspond to the upper layer.
As shown in fig. 6 to 8, the frame beam 7 lower support 46 includes a frame beam lower support main rod 461, a frame beam lower support top 462 connected to the top of the frame lower support main rod, a frame beam lower support cushion 463 connected to the bottom of the frame lower support main rod, and a frame beam lower support adjusting plate 464 connected between the frame lower support top and the frame beam 7.
In this embodiment, the frame beam lower support 462 includes a frame support adjusting rod 4621 penetrating the frame beam lower support main rod 461, a frame support adjusting hoop 4622 connected to the outer side of the top of the frame beam lower support main rod 461 and screwed to the frame support adjusting rod 4621, and a frame support 4623 connected to the top of the frame support adjusting rod 4621;
in this embodiment, the distance between the top surfaces of the frame lower support top support and the beam lower support top support 452 should not be greater than 300 mm;
the clearance between the outer diameter of the frame support jacking adjusting rod 4621 and the beam support jacking adjusting rod and the inner diameter of the steel pipe of the corresponding column top upright rod is not more than 3mm, and the upper part and the lower part of the clearance are coaxial during installation; the protruding length is not more than 300mm, and the inserted length is not less than 150 mm. In addition, the frame body in the high formwork supporting area and the non-high formwork supporting area is integrated through the horizontal rods in a pulling mode, the horizontal rods at the high formwork supporting position extend to the non-high formwork supporting area through fastener type steel pipes and are fastened with the vertical rods, and at least three vertical rods are arranged on each side.
In this embodiment, the horizontal connecting rod 42 and the horizontal secondary connecting rod 43 enclose a square frame or a rectangular frame, and a frame is respectively arranged at one side away from the ground floor 3 and one side of the interlayer floor slab 8; the layer horizontal cross connecting rod 42 comprises a layer horizontal cross main connecting rod 421 and a layer horizontal connecting rod 422 connected at the lower part of the girder 6 and the frame beam 7, and the connection density of the layer horizontal connecting rod 422 at the girder 6 is greater than that at the frame beam 7; at least one suspension net 5 is respectively arranged at the lower part of the girder 6 and the lower part of the frame beam 7.
In this embodiment, the scissor supports 47 are divided into full scissor supports 47, half scissor supports 47 and partial scissor supports 47; the full cross braces 47 are connected to the floor 3 and the interlayer floor 8 in the height range, the half cross braces 47 are the cross braces 47 arranged at the lower part of the crossbeam 6, and the local cross braces 47 are the cross braces 47 arranged at the positions with large stress in an encrypted manner.
In this embodiment, displacement sensors and deformation sensors are installed at the connection nodes of the cross braces 47, the rod pieces of the basement support system 2 and the connection nodes of the rod pieces of the interlayer support system 4, and the sensors are connected with the remote computer control early warning platform.
The above description is only for the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be considered by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention.
Claims (10)
1. A tall and big template supporting and connecting structure is characterized by comprising a basement supporting system (2) connected between a basement foundation bottom plate (1) and a basement top floor (3), an interlayer supporting system (4) connected between the floor (3) and an interlayer floor slab (8), and a template system (9) connected between the basement supporting system (2) and the floor slab (3), wherein the interlayer supporting system (4) is respectively connected with a girder (6), a frame beam (7) and the interlayer floor slab (8);
the interlayer supporting system (4) comprises a layer vertical post (41) connected between the floor slab (8) and the floor slab (3), a layer horizontal transverse connecting rod (42) and a layer horizontal secondary transverse connecting rod (43) which are vertically connected to the layer vertical post (41) at intervals, a layer base plate (44) connected to the bottom of the layer vertical post (41), a girder (6) lower support (45) connected between the lower part of the girder (6) and the floor slab (3), a frame beam (7) lower support (46) connected to the lower part of the frame beam (7), a floor slab lower support (48) connected between the interlayer floor slab (8) and the floor slab (3), and a cross support (47) connected between the layer vertical posts (41).
2. The high formwork support connection structure of claim 1, wherein the basement support system (2) comprises a ground pillar (21) connected between the foundation slab (1) and the floor slab (3), ground horizontal cross links (22) and ground horizontal secondary cross links (23) vertically connected to the ground pillar (21) at intervals, a ground pad plate (24) connected to the bottom of the ground pillar (21) and a ground top brace (25) connected to the top of the ground pillar (21);
the ground horizontal transverse connecting rod (22) and the ground horizontal secondary transverse connecting rod (23) are encircled to form a square frame or a rectangular frame, and a frame is respectively arranged on one side away from the foundation bottom plate (1) and one side away from the ground floor (3).
3. The high and large formwork support connection structure according to claim 1, wherein the girder (6) lower support (45) comprises a girder lower support main rod (451), a girder lower pad plate connected between the bottom of the girder lower support main rod (451) and the top of the floor panel (3), a girder lower support top bracket (452) connected to the top of the girder lower support main rod (451), and a girder lower support adjusting block (453) connected between the girder lower support top bracket (452) and the girder (6); the height of the girder (6) is not less than 3 m.
4. A tall form support connection as claimed in claim 3, wherein the frame beam (7) lower support (46) comprises a frame beam lower support main rod (461), a frame beam lower support top bracket (462) connected to the top of the frame lower support main rod, a frame beam lower support backing plate (463) connected to the bottom of the frame lower support main rod, and a frame beam lower support adjusting plate (464) connected between the frame lower support top bracket and the frame beam (7).
5. The supporting and connecting structure for tall formworks as claimed in claim 4, wherein the bottom brace (462) of the frame girder comprises a bottom brace adjusting rod (4621) penetrating through the bottom brace main rod (461) of the frame girder, a bottom brace adjusting hoop (4622) connected to the outer side of the top of the bottom brace main rod (461) of the frame girder and screwed to the bottom brace adjusting rod (4621), and a bottom brace supporting body (4623) connected to the top of the bottom brace adjusting rod (4621);
the roof beam props top and holds in the palm (452) and contains the roof beam that cross-under props mobile jib (451) and props the top and hold in the palm the transfer pole, connect in the roof beam and prop the roof beam that props the outside of mobile jib (451) top and threaded connection roof beam props the top of propping the top and holds in the palm the hoop and connect in the roof beam props the roof beam that props the top of propping up the top and hold in the palm the support body at transfer pole top.
6. The tall form supporting and connecting structure as claimed in claim 5, wherein the beam supporting and supporting body and the frame supporting and supporting body (4623) are both U-shaped pieces, and the height of both sides of the U-shaped pieces is not less than half of the height of the corresponding beam lower supporting and adjusting block (453) and frame beam lower supporting and adjusting plate (464).
7. A tall and big form support connection structure as claimed in claim 6, wherein the level horizontal cross tie bars (42) and level horizontal secondary cross tie bars (43) enclose a square or rectangular frame, and a frame is provided on the side away from the floor slab (3) and the side of the inter-floor slab (8);
the layer horizontal transverse connecting rod (42) comprises a layer horizontal transverse main connecting rod (421) and a layer horizontal connecting rod (422) connected at the lower part of the crossbeam (6) and the frame beam (7), and the connection density of the layer horizontal connecting rod (422) at the crossbeam (6) is greater than that at the frame beam (7);
at least one suspension net (5) is respectively arranged at the lower part of the girder (6) and the lower part of the frame beam (7).
8. A tall form support connection as claimed in claim 1, wherein the scissor braces (47) are divided into full scissor braces (47), half scissor braces (47) and partial scissor braces (47); the full cross braces (47) are connected to the floor slab (3) and the interlayer floor slab (8) in the height range in a full length mode, the half cross braces (47) are the cross braces (47) arranged on the lower portion of the crossbeam (6), and the local cross braces (47) are the cross braces (47) arranged in a stressed position in an encrypted mode.
9. The high and large formwork support connection structure as claimed in claim 1, wherein displacement sensors and deformation sensors are installed at the cross brace (47), each rod connection node of the basement support system (2) and each rod connection node of the interlayer support system (4), and the sensors are connected with the remote computer control early warning platform.
10. A tall form support connection as claimed in claim 1, wherein the form system (9) comprises a floor form (91) supported on top of the basement support system (2), a girder form (92) attached to top of the girder (6) lower support (45), a floor form (93) attached to top of the inter-floor support system (4); the floor slab template (93) further comprises a floor slab template (931) for pouring an interlayer floor slab (8) and a frame beam template (932) for pouring a frame beam (7); the outer side of a template of the template system (9) is connected with a batten (11), back ridges (12), split bolts (10) connected between the back ridges (12) and diagonal braces (13) reinforced at two sides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120604767.0U CN214942440U (en) | 2021-03-25 | 2021-03-25 | High and large formwork support connecting structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120604767.0U CN214942440U (en) | 2021-03-25 | 2021-03-25 | High and large formwork support connecting structure |
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| CN214942440U true CN214942440U (en) | 2021-11-30 |
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| CN202120604767.0U Active CN214942440U (en) | 2021-03-25 | 2021-03-25 | High and large formwork support connecting structure |
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2021
- 2021-03-25 CN CN202120604767.0U patent/CN214942440U/en active Active
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