CN214885414U - Structure peripheral overhanging upper hanging seat mounting structure - Google Patents
Structure peripheral overhanging upper hanging seat mounting structure Download PDFInfo
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- CN214885414U CN214885414U CN202121020791.6U CN202121020791U CN214885414U CN 214885414 U CN214885414 U CN 214885414U CN 202121020791 U CN202121020791 U CN 202121020791U CN 214885414 U CN214885414 U CN 214885414U
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- hanging seat
- floor slab
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Abstract
The utility model discloses a structure periphery overhanging upper hanging seat mounting structure, which comprises a channel steel hanging seat which is paved at the edge of a floor by pre-buried bent round steel and high-strength wall-penetrating bolts, wherein the front end of the channel steel hanging seat extends to the outer side of the floor to form an overhanging section, and a channel steel hanging seat at the rear of the overhanging section is provided with two bolt pull rods; the bottom end of a first bolt pull rod penetrates through a channel steel hanging seat and a floor slab of a construction layer, and is hinged and connected with a channel steel hanging seat of a lower floor slab through a pull rod lower connecting piece and a pin shaft, and the channel steel hanging seat is tightly pressed on the floor slab of the construction layer through mountain nuts and pull rod upper connecting pieces which are arranged in pairs at the top end of the first bolt pull rod; the second bolt pull rod is arranged between the upper floor slab and the construction floor slab in a fixing mode of the first bolt pull rod, and the upper floor slab, the construction floor slab and the lower floor slab are connected into a stressed whole through the two bolt pull rods. The utility model discloses the atress is reasonable, pass power reliable, the route is succinctly clear and definite, overall stability is good, intensity is high, the commonality is strong, and construction operation is simple moreover, can 100% have enough to meet the need the use.
Description
Technical Field
The utility model relates to a construction technical field, concretely relates to structure periphery is encorbelmented and is hung a mounting structure.
Background
Along with the increasing abundance of building resources, the building structure is diversified and complicated, and the overhanging of the structure periphery is one of the building structures. During peripheral overhanging of the structure, external force is transmitted by depending on the floor slab, and the bearing capacity limit value of the overhanging floor slab is far smaller than that of a non-overhanging structure, so that great difficulty is brought to construction. At present, the treatment for hanging seats on cantilever structures at home and abroad generally comprises the following steps: (1) the method has the advantages that the enlarged hanging seat is adopted, the hanging seat within the overhanging floor slab length range is picked out, the load is transmitted to the beam by increasing the specification and the length of the hanging seat according to overhanging calculation, the construction cost is greatly increased, the enlarged hanging seat cannot be used on the hanging seat with a non-overhanging structure, and the purpose of universal hanging seat cannot be achieved; (2) the standard hanging seat is adopted, and the steel wire rope drawknot is utilized to transmit load to the beam, so that the construction cost is saved to a certain extent, but the steel wire rope drawknot construction difficulty is high, the construction quality is difficult to control, the safety guarantee is low, and the steel wire rope drawknot can not be used in a turnover mode.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a structure periphery is encorbelmented and is hung a mounting structure to solve in the background art technical problem.
In order to achieve the technical purpose, the utility model adopts the following technical scheme:
a structure peripheral overhanging upper hanging seat mounting structure comprises a channel steel hanging seat, wherein the channel steel hanging seat is paved at the edge position of a floor slab sequentially through two anchoring structures of pre-buried bent round steel and high-strength wall-penetrating bolts from back to front, the front end of the channel steel hanging seat extends to the outer side of the floor slab to form an overhanging section, and two bolt pull rods which are parallel to each other are arranged on the channel steel hanging seat behind the overhanging section from back to front;
the two bolt pull rods are arranged in a backward inclined mode, the bottom end of the first bolt pull rod penetrates through a channel steel hanging seat and a floor slab of the construction layer between the embedded bending round steel and the high-strength wall penetrating bolt and extends to the channel steel hanging seat of the lower floor slab, the first bolt pull rod is hinged with the channel steel hanging seat of the lower floor slab in front of the high-strength wall penetrating bolt through a pull rod lower connecting piece and a pin shaft, and the top end of the first bolt pull rod is pressed on the floor slab of the construction layer through a mountain-shaped nut and a pull rod upper connecting piece which are arranged in pairs; the second bolt pull rod is arranged between the upper floor slab and the construction floor slab in a fixing mode of the first bolt pull rod, and the upper floor slab, the construction floor slab and the lower floor slab are connected into a stressed whole by the two bolt pull rods;
the embedded bending round steel is L-shaped, a cross rod of the embedded bending round steel is welded and fixed with a steel beam at the bottom of a floor slab, a vertical rod of the embedded bending round steel penetrates through the floor slab and the channel steel hanging seat and extends to the upper part of the channel steel hanging seat, a mountain-shaped nut and a pressure-bearing backing plate which are arranged in pair are arranged at the top end of the vertical rod in a threaded mode, and the mountain-shaped nut presses the channel steel hanging seat on the floor slab through the pressure-bearing backing plate;
the high-strength wall-penetrating bolt is vertically arranged, a screw rod of the high-strength wall-penetrating bolt penetrates through the floor slab and the channel steel hanging seat, the two ends of the top and the bottom of the high-strength wall-penetrating bolt respectively extend to the channel steel hanging seat and the outer side of the floor slab, nuts of the high-strength wall-penetrating bolt are arranged in pairs, and the channel steel hanging seat is tightly pressed and fixed on the floor slab through pressure-bearing base plates on the outer sides of the floor slab and the channel steel hanging seat respectively.
Preferably, the pull rod upper connecting piece comprises two connecting side plates and a pressure-bearing top plate, the two connecting side plates are symmetrically arranged, the two connecting side plates are respectively attached to the inner sides of two wing plates of the channel steel hanging seat, the top end of the connecting side plate exceeds the upper edge of the channel steel hanging seat and is an inclined plane with a high front part and a low rear part, the pressure-bearing top plate is arranged between the two connecting side plates in a crossing mode and is welded and fixed with the two connecting side plates, and three mounting through holes are formed in the middle of the plate surface of the pressure-bearing top plate at intervals in the front-back direction.
Preferably, the connecting piece includes the lower connection otic placode that the last connection otic placode and two symmetries that two symmetries set up that the pull rod set up, and the articulated otic placode thickness phase-match of interval and bolt pull rod bottom that sets up of two last connection otic placodes, and the setting interval phase-match between seat both sides pterygoid lamina is hung to setting up interval and channel-section steel of two lower connection otic placodes, it is parallel to each other with lower connection otic placode to go up the connection otic placode, and the two one end that is close to each other is perpendicularly welded respectively on keysets both sides face, the connection otic placode top is equipped with the stiffening web down, the stiffening web is perpendicularly welded under between connection otic placode and the keysets.
Preferably, the bolt pull rod and the high-strength wall-penetrating bolt penetrate through the floor slab and are respectively reserved through pre-embedded sleeves made of PVC pipes with the diameters of 150mm and 40 mm.
Preferably, a plurality of through holes are correspondingly formed in the bottoms of wing plates on two sides of the channel steel hanging seat and used for installing the pull rod upper connecting piece and the pull rod lower connecting piece, and the through holes are distributed at equal intervals along the extending direction of the channel steel hanging seat.
Preferably, a leveling base plate is arranged between the channel steel hanging seat and the floor slab so as to adjust the mounting height of the channel steel hanging seat to be level with the peripheral overhanging structure connecting component.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model discloses a wear to establish bolt pull rod between the floor and replace traditional wire rope flexible coupling, regard as a construction unit with the three-layer floor, with the upper floor, construction layer floor and lower floor are even whole as a atress, the problem that traditional wire rope drawknot is not tight has been solved, make on hang a node atress reasonable, pass power reliable, the route is succinct clear and definite, the overall stability is good, high strength, the commonality is strong, after the completion of construction layer, only need hang the seat with the channel-section steel of lower floor and the whole turnover of bolt pull rod to square floor department can, construction easy operation, can 100% turnover use, it is high to have overcome traditional structural hanging seat system input cost of encorbelmenting, construction operation difficulty, the safety guarantee is low, can not have enough to meet the need shortcomings such as use.
Drawings
The above and/or other aspects and advantages of the present invention will become more apparent and more readily appreciated from the detailed description taken in conjunction with the following drawings, which are given by way of illustration only and not by way of limitation, wherein:
fig. 1 is a schematic structural view of the present invention;
FIG. 2 is an enlarged schematic view of the channel steel hanging seat of the present invention;
fig. 3 is a top view of the channel steel hanging seat of the utility model;
FIG. 4 is a schematic structural view of the connecting member on the pull rod of the present invention;
fig. 5 is a schematic structural view of the tie rod bearing top plate of the present invention;
fig. 6 is a front view of the lower connecting member of the pull rod of the present invention;
fig. 7 is a side view of the lower connecting member of the pull rod of the present invention;
fig. 8 is a schematic view of the specific construction process of the present invention.
Reference numerals: the concrete beam comprises, by weight, 1-a floor slab, 2-a steel beam, 3-a channel steel hanging seat, 4-embedded bent round steel, 5-a pressure-bearing base plate, 6-a mountain nut, 7-a screw rod pull rod, 8-a pull rod upper connecting piece, 801-a connecting side plate, 802-a pressure-bearing top plate, 9-a pull rod lower connecting piece, 901-an upper connecting lug plate, 902-a transfer plate, 903-a lower connecting lug plate, 904-a stiffening web plate, 10-a pin shaft, 11-a high-strength wall penetrating bolt, 12-an embedded sleeve and 13-an adjusting base plate.
Detailed Description
Hereinafter, an embodiment of a structure peripheral cantilever upper hanging seat mounting structure of the present invention will be described with reference to the accompanying drawings. The embodiments described herein are specific embodiments of the present invention, and are intended to be illustrative of the concepts of the present invention, which are intended to be illustrative and exemplary, and should not be construed as limiting the scope of the embodiments of the present invention. In addition to the embodiments described herein, those skilled in the art will be able to employ other technical solutions which are obvious based on the disclosure of the claims and the specification of the present application, and these technical solutions include technical solutions which make any obvious replacement or modification for the embodiments described herein.
In the description of the present invention, it should be noted that the terms "front", "back", "upper", "lower", "top", "bottom", "inner", "outer", "vertical", "horizontal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The drawings in the present specification are schematic views to assist in explaining the concept of the present invention, and schematically show the shapes of the respective portions and the mutual relationships thereof. It should be noted that for the sake of clarity in showing the structures of the various components of the embodiments of the present invention, the drawings are not drawn to the same scale. Like reference numerals are used to denote like parts.
The principles and features of the present invention are described below in conjunction with the following drawings, the illustrated embodiments are provided to explain the present invention and not to limit the scope of the invention. The preferred embodiments of the present invention will be described in further detail below with reference to fig. 1-8:
as shown in fig. 1-3, the preferred structure peripheral overhanging upper hanging seat mounting structure of the present invention comprises a channel steel hanging seat 3, wherein the channel steel hanging seat 3 is laid at the edge of a floor slab 1 from back to front through a pre-embedded bent round steel 4 and a high-strength wall-penetrating bolt 11 in sequence, the front end of the channel steel hanging seat 3 extends to the outer side of the floor slab 1 to form an overhanging section, and two bolt pull rods 7 which are parallel to each other are arranged on the channel steel hanging seat 3 at the rear of the overhanging section from back to front;
the embedded bending round steel 4 is L-shaped, a cross rod of the embedded bending round steel is welded and fixed with a steel beam 2 at the bottom of a floor slab 1, a vertical rod of the embedded bending round steel penetrates through the floor slab 1 and a channel steel hanging seat 3 and extends above the channel steel hanging seat 3, a mountain-shaped nut 6 and a pressure-bearing backing plate 5 which are arranged in pairs are arranged at the top end of the vertical rod in a thread cutting and screwing mode, and the channel steel hanging seat 3 is pressed on the floor slab 1 through the pressure-bearing backing plate 5 by the mountain-shaped nut 6;
the high-strength wall-penetrating bolt 11 is vertically arranged, a screw rod of the high-strength wall-penetrating bolt penetrates through the floor slab 1 and the channel steel hanging seat 3, the top end and the bottom end of the high-strength wall-penetrating bolt respectively extend to the outer sides of the channel steel hanging seat 3 and the floor slab 1, nuts of the high-strength wall-penetrating bolt are arranged in pairs, and the channel steel hanging seat 3 is tightly pressed and fixed on the floor slab 1 through the pressure-bearing base plate 5 on the outer sides of the floor slab 1 and the channel steel hanging seat 3 respectively;
the two bolt pull rods 7 are both arranged in a backward inclined mode, the bottom end of the first bolt pull rod 7 penetrates through the channel steel hanging seat 3 and the floor slab 1 of the construction layer between the embedded bending round steel 4 and the high-strength wall penetrating bolt 11 and extends to the channel steel hanging seat 3 of the lower floor slab 1, the front of the high-strength wall penetrating bolt 11 is hinged and connected with the channel steel hanging seat 3 of the lower floor slab 1 through a pull rod lower connecting piece 9 and a pin shaft 10, and the channel steel hanging seat 3 is tightly pressed on the floor slab 1 of the construction layer through a mountain-shaped nut 6 and a pull rod upper connecting piece 8 which are arranged in pairs at the top end of the first bolt pull rod 7; the second bolt pull rod 7 is arranged between the upper floor slab 1 and the construction floor slab 1 in a fixing mode of the first bolt pull rod 7, and the upper floor slab 1, the construction floor slab 1 and the lower floor slab 1 are connected into a stressed whole by the two bolt pull rods 7;
as shown in fig. 4-5, the upper tie rod connecting piece 8 includes two connecting side plates 801 and a pressure-bearing top plate 802, which are symmetrically arranged, the two connecting side plates 801 are respectively attached to the inner sides of two wing plates of the channel hanging seat 3, the top end of the connecting side plate exceeds the upper edge of the channel hanging seat 3 and is an inclined plane with a high front part and a low rear part, the pressure-bearing top plate 802 is spanned between the two connecting side plates 801 and is welded and fixed with the two connecting side plates 801, the middle part of the plate surface is provided with three mounting through holes at intervals along the front-rear direction, and an enough adjustment margin is reserved for adjusting the depth of the channel hanging seat 3;
as shown in fig. 6-7, the pull rod lower connecting member 9 includes two upper connecting ear plates 901 symmetrically arranged and two lower connecting ear plates 903 symmetrically arranged, the setting distance of the two upper connecting ear plates 901 is matched with the thickness of the hinged ear plate at the bottom end of the bolt pull rod 7, the setting distance of the two lower connecting ear plates 903 is matched with the setting distance between wing plates at two sides of the channel steel hanging seat 3, the upper connecting ear plates 901 and the lower connecting ear plates 903 are parallel to each other, and the ends of the upper connecting ear plates 901 and the lower connecting ear plates 903 close to each other are respectively and vertically welded on the two side plate surfaces of the adapter plate 902, the top of the lower connecting ear plates 903 is provided with a stiffening web 904, and the stiffening web 904 is vertically welded between the lower connecting ear plates 903 and the adapter plate 902;
the bolt pull rod 7 and the high-strength wall-penetrating bolt 11 penetrate through the floor slab 1, and the reservation of a wall-penetrating hole is realized through an embedded sleeve 12 made of PVC pipes with the diameter of 150mm and the diameter of 40mm respectively;
for guaranteeing that connecting piece 8 and pull rod down connecting piece 9 can hang the 3 fore-and-aft directions of seat along the channel-section steel and realize the depth adjustment in the certain limit, the channel-section steel is hung 3 both sides pterygoid lamina bottoms of seat and is corresponded the installation of having seted up a plurality of through-hole and being used for connecting piece 8 and pull rod down connecting piece 9 on the pull rod, and a plurality of through-hole is hung 3 extending direction equidistant laying of seat along the channel-section steel.
As shown in fig. 8, the specific construction steps of the present invention are as follows,
the method comprises the following steps: constructing two to four layers of floor slabs 1 and embedding embedded bending round steel 4 and embedded sleeves 12 in advance;
step two: after the concrete of the second floor slab 1 to the fourth floor slab 1 reaches the strength, installing a channel steel hanging seat 3 and adjusting the height of the channel steel hanging seat to a position corresponding to the guide rail connecting piece through an adjusting base plate 13;
step three: correspondingly installing the bolt pull rods 7 at the second-layer floor slab and the third-layer floor slab 1 on the channel steel hanging seats 3 through the pull rod upper connecting pieces 8 and the pull rod lower connecting pieces 9;
step four: sequentially installing a guide rail, a climbing frame and a hydraulic climbing system;
step five: constructing a fifth floor slab 1 and embedding embedded bent round steel 4 and embedded sleeves 12 in advance;
step six: after the concrete of the fifth floor slab 1 reaches the strength, installing a channel steel hanging seat 3 and adjusting the height of the channel steel hanging seat to a position corresponding to the guide rail connecting piece through an adjusting base plate 13;
step seven: correspondingly installing a bolt pull rod 7 at the fifth floor slab 1 on the channel steel hanging seat 3 through a pull rod upper connecting piece 8 and a pull rod lower connecting piece 9;
step eight: jacking the guide rail and the climbing frame through a hydraulic climbing device and installing the guide rail and the climbing frame on a channel steel hanging seat 3 of a fifth floor slab 1;
step nine: constructing a sixth floor 1 and embedding embedded bent round steel 4 and embedded sleeves 12 in advance;
step ten: after the concrete of the sixth floor 1 reaches the strength, removing the channel steel hanging seats 3 and the bolt pull rods 7 on the first floor 1 and mounting the channel steel hanging seats and the bolt pull rods to the sixth floor 1 in a circulating manner;
step eleven: constructing the upper floor slab 1 according to the method in the eighth step to the tenth step until the structure is capped;
step twelve: the guide rail is dismantled, the frame, the hydraulic climbing system, the bolt pull rod 7 and the channel steel hanging seat 3 are climbed, and the construction site is circulated to the next construction site.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (6)
1. The utility model provides a structure periphery is encorbelmented and is hung a mounting structure which characterized in that: the steel channel hanging seat comprises a steel channel hanging seat (3), wherein the steel channel hanging seat (3) is paved at the edge of a floor slab (1) through two anchoring structures of pre-buried bent round steel (4) and a high-strength wall penetrating bolt (11) from back to front in sequence, the front end of the steel channel hanging seat extends to the outer side of the floor slab (1) to form an overhanging section, and two bolt pull rods (7) which are parallel to each other are arranged on the steel channel hanging seat (3) behind the overhanging section from back to front;
the two bolt pull rods (7) are both arranged in a backward inclining mode, the bottom end of the first bolt pull rod (7) penetrates through a channel steel hanging seat (3) and a floor slab (1) of a construction layer between pre-buried bent round steel (4) and a high-strength wall penetrating bolt (11) and extends to the channel steel hanging seat (3) of the lower floor slab (1), the front of the high-strength wall penetrating bolt (11) is hinged and connected with the channel steel hanging seat (3) of the lower floor slab (1) through a pull rod lower connecting piece (9) and a pin shaft (10), and the top end of the first bolt pull rod pull seat (3) is tightly pressed on the construction layer floor slab (1) through a mountain-shaped nut (6) and a pull rod upper connecting piece (8) which are arranged in pairs; the second bolt pull rod (7) is arranged between the upper floor (1) and the construction floor (1) in a fixing mode of the first bolt pull rod (7), and the upper floor (1), the construction floor (1) and the lower floor (1) are connected into a stressed whole through the two bolt pull rods (7);
the embedded bent round steel (4) is L-shaped, a cross rod of the embedded bent round steel is welded and fixed with a steel beam (2) at the bottom of a floor slab (1), a vertical rod of the embedded bent round steel penetrates through the floor slab (1) and a channel steel hanging seat (3) and extends above the channel steel hanging seat (3), a mountain-shaped nut (6) and a pressure-bearing backing plate (5) which are arranged in pair are arranged at the top end of the vertical rod in a thread cutting mode, and the channel steel hanging seat (3) is tightly pressed on the floor slab (1) through the pressure-bearing backing plate (5) by the mountain-shaped nut (6);
the high-strength wall-penetrating bolt (11) is vertically arranged, a screw rod of the high-strength wall-penetrating bolt penetrates through the floor slab (1) and the channel steel hanging seat (3), the two ends of the top and the bottom of the high-strength wall-penetrating bolt respectively extend to the outer sides of the channel steel hanging seat (3) and the floor slab (1), nuts of the high-strength wall-penetrating bolt are arranged in pairs, and the channel steel hanging seat (3) is compressed and fixed on the floor slab (1) through the pressure-bearing base plate (5) on the outer sides of the floor slab (1) and the channel steel hanging seat (3).
2. The structure peripheral overhanging upper hanging seat mounting structure as claimed in claim 1, wherein: connecting piece (8) are including connecting curb plate (801) and a pressure-bearing roof (802) that two symmetries set up on the pull rod, and two are connected curb plate (801) and paste respectively and locate the channel-section steel and hang seat (3) both wings inboard, and its top surpasss the channel-section steel and hangs seat (3) and go up the reason and be the low inclined plane in preceding high back, pressure-bearing roof (802) stride locate between two connect curb plate (801) and with two be connected curb plate (801) welded fastening, three installation through-hole has been seted up along the fore-and-aft direction interval in its face middle part.
3. The structure peripheral overhanging upper hanging seat mounting structure as claimed in claim 1, wherein: connecting piece (9) are connected under the pull rod including last connection otic placode (901) and the lower connection otic placode (903) that two symmetries set up that the symmetry set up, two go up the articulated otic placode thickness phase-matchs that set up interval and bolt pull rod (7) bottom of connecting otic placode (901), two lower connection otic placodes (903) set up interval and channel-section steel and hang the setting interval phase-match between seat (3) both sides pterygoid lamina, it is parallel to each other with lower connection otic placode (903) to go up connection otic placode (901), and the two one end that is close to each other is perpendicular welding respectively on keysets (902) both sides face, it is equipped with stiffening web (903) to connect otic placode (903) top down, stiffening web (904) perpendicular welding is connected between otic placode (903) and keysets (902) down.
4. The structure peripheral overhanging upper hanging seat mounting structure as claimed in claim 1, wherein: the bolt pull rod (7) and the high-strength wall penetrating bolt (11) penetrate through the floor slab (1) and are reserved through the embedded sleeve (12) made of the PVC pipe with the diameter of 150mm and the diameter of 40mm respectively.
5. The structure peripheral overhanging upper hanging seat mounting structure as claimed in claim 1, wherein: the bottom of wing plates on two sides of the channel steel hanging seat (3) is correspondingly provided with a plurality of through holes for installing a pull rod upper connecting piece (8) and a pull rod lower connecting piece (9), and the plurality of through holes are arranged at equal intervals along the extending direction of the channel steel hanging seat (3).
6. The structure peripheral overhanging upper hanging seat mounting structure as claimed in claim 1, wherein: and a leveling base plate (13) is arranged between the channel steel hanging seat (3) and the floor slab (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121020791.6U CN214885414U (en) | 2021-05-13 | 2021-05-13 | Structure peripheral overhanging upper hanging seat mounting structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121020791.6U CN214885414U (en) | 2021-05-13 | 2021-05-13 | Structure peripheral overhanging upper hanging seat mounting structure |
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| CN214885414U true CN214885414U (en) | 2021-11-26 |
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| CN202121020791.6U Active CN214885414U (en) | 2021-05-13 | 2021-05-13 | Structure peripheral overhanging upper hanging seat mounting structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113216590A (en) * | 2021-05-13 | 2021-08-06 | 中建一局集团建设发展有限公司 | Hanging seat system on cantilever structure and construction method |
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2021
- 2021-05-13 CN CN202121020791.6U patent/CN214885414U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113216590A (en) * | 2021-05-13 | 2021-08-06 | 中建一局集团建设发展有限公司 | Hanging seat system on cantilever structure and construction method |
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