CN110629996A - Construction method of profile steel cantilever through-wall-free heightening and anchoring support system - Google Patents
Construction method of profile steel cantilever through-wall-free heightening and anchoring support system Download PDFInfo
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- CN110629996A CN110629996A CN201910938757.8A CN201910938757A CN110629996A CN 110629996 A CN110629996 A CN 110629996A CN 201910938757 A CN201910938757 A CN 201910938757A CN 110629996 A CN110629996 A CN 110629996A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G3/00—Scaffolds essentially supported by building constructions, e.g. adjustable in height
- E04G3/18—Scaffolds essentially supported by building constructions, e.g. adjustable in height supported by cantilevers or other provisions mounted in openings in the building, e.g. window openings
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- Architecture (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
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Abstract
The invention relates to a construction method of a section steel cantilever wall-through-free heightening and anchoring support system, which is characterized by comprising the following steps of: 1) installing a support above the floor slab; 2) a profile steel force transmission fixing frame is arranged on the lower edge of the window; 3) installing overhanging section steel, wherein the overhanging section steel extends to the inner side of the window from the outer side of the window, the overhanging section steel is erected above the section steel force transmission fixing frame and the support, the middle part of the overhanging section steel is locked by a force transmission cover plate on the section steel force transmission fixing frame, and the inner end of the overhanging section steel is locked by the cover plate above the support; 4) mounting a vertical upright column, wherein the bottom end of the vertical upright column is fixed with the overhanging section steel, and the top end of the vertical upright column is fixed with a beam of an upper layer structure; 5) and a plurality of steel wire ropes are used for drawing the outer end of the cantilever section steel and the top end of the vertical upright post. The invention establishes support at the existing window wall opening, the connection strength of the overhanging section steel with the ground and the window is high, the construction is convenient and efficient, and the problem that the section steel needs to penetrate the wall when the existing window wall opening is overhanging is solved.
Description
Technical Field
The invention relates to the technical field of section steel cantilever anchoring support, in particular to a construction method of a section steel cantilever through-wall-free heightening anchoring support system, which is suitable for construction of building existing portal section steel cantilever support, and is particularly suitable for construction of a shear wall existing window portal outer section steel cantilever anchoring support structure.
Background
In recent years, under the condition that the land used by a residential building is short, the residential building is mostly developed into a high-rise residential building, but the floor type scaffold cannot meet the construction requirement along with the increase of a structural layer because the input amount of disposable steel pipes and fasteners of the floor type scaffold is large; and the integral lifting scaffold is limited to be applied to civil houses due to cost factors, and is mainly applied to the core tube construction of super high-rise buildings. The cantilever scaffold is the most common scaffold in practical engineering, and has good effect because the section steel can be recycled and does not need to fall to the ground, thereby greatly saving the material cost.
However, in the specific construction process, the structural steel overhanging outer scaffold disclosed in the chinese patent with the patent number CN 208907298U is adopted when the structural steel overhanging construction is carried out at the existing shear wall window and wall opening, and the outer scaffold comprises the outer scaffold, an overhanging assembly and a pillar clasping assembly, wherein the overhanging assembly comprises an i-steel overhanging beam and an anchoring assembly which are transversely arranged, one end of the i-steel overhanging beam is fixed with the outer scaffold, and the other end of the i-steel overhanging beam is fixed with the anchoring assembly which is pre-embedded on a structural floor slab; the anchor subassembly includes U type anchor muscle subassembly, U type anchor muscle subassembly includes U type anchor muscle, angle steel and the nut that the opening upwards set up, U type anchor muscle lower part is pre-buried in structural floor, is equipped with the horizontal additional muscle that sets up in the U type space of U type anchor muscle, and the vertical muscle of lower floor of structural floor hugs closely additional muscle and sets up, and the I-steel cantilever beam passes between two perpendicular portions of U type anchor muscle, and it has the flitch to wedge tightly to fill in between the web of I-steel cantilever beam and the perpendicular portion of both sides U type anchor muscle.
However, according to the technical scheme, the structural steel can be overhung outwards to form a supporting system, the existing shear wall needs to be penetrated and damaged, the I-shaped steel cantilever beam and the transverse connecting rod need to be penetrated and arranged, the construction difficulty and cost are increased, certain risks exist, the subsequent waterproof and other problems are solved, a large number of pre-buried anchor rings exist when the traditional structural steel is overhung, the construction cost is greatly increased, and the construction progress is influenced.
Disclosure of Invention
The invention aims to provide a construction method of a structural steel cantilever through-wall-free heightening anchoring support structure aiming at the phenomenon that a traditional window opening type steel cantilever anchoring support needs to be provided with an opening and connecting pieces are pre-embedded on a shear wall and a beam, and the problems are well solved.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
the invention relates to a construction method of a section steel cantilever through-wall-free heightening and anchoring support system, which is characterized by comprising the following steps of:
1) installing a support above the floor slab;
2) a profile steel force transmission fixing frame is arranged on the lower edge of the window;
3) installing overhanging section steel, wherein the overhanging section steel extends to the inner side of the window from the outer side of the window, the overhanging section steel is erected above the section steel force transmission fixing frame and the support, the middle part of the overhanging section steel is locked by a force transmission cover plate on the section steel force transmission fixing frame, and the inner end of the overhanging section steel is locked by the cover plate above the support;
4) mounting a vertical upright column, wherein the bottom end of the vertical upright column is fixed with the overhanging section steel, and the top end of the vertical upright column is fixed with a beam of an upper layer structure;
5) and a plurality of steel wire ropes are used for drawing the outer end of the cantilever section steel and the top end of the vertical upright post.
Preferably, the step 1) of mounting the support comprises the following specific steps:
1.1) manufacturing a support, namely welding a bottom plate at the bottom end of an upright rod, welding a J-shaped top plate at the top end of the upright rod to form the support, welding two limiting blocks on the upper surface of the bottom plate of the J-shaped top plate, and arranging a welding nut on the lower surface of the bottom plate of the J-shaped top plate;
1.2) connecting a bottom plate of the support with a U-shaped rib which is arranged on a floor slab in advance by adopting a nut to realize the connection of the support and the floor slab;
when the cantilever type steel is installed, the inner end of the cantilever type steel is installed between the two limiting blocks, and the cover plate is covered above the cantilever type steel and then is locked by the double-end bolt and the welding nut.
Preferably, the step 2) of installing the profile steel force transmission fixing frame below the window comprises the following specific steps:
2.1) welding a limiting rod above the force transmission fixing frame, wherein the limiting rod is divided into a front group and a rear group to form the profile steel force transmission fixing frame;
2.2) fixing the force transmission fixing frame on the concrete outer wall at the lower edge of the window through a stud;
when the cantilever type steel is installed, the cantilever type steel penetrates through the two sets of limiting rods, and after the force transmission cover plate is installed above the cantilever type steel, the force transmission cover plate is locked at the end part of the limiting rods through nuts.
Preferably, after the fixed frame is fixed on the concrete outer wall at the lower edge of the window, the outer side surface of the force transmission fixed frame is welded with the limiting section steel.
Preferably, the step 4) of installing the vertical column specifically comprises the following steps:
4.1) connecting a bottom plate of the upright column at the bottom end of the upright column, and welding an ear plate at the top of the upright column to form a vertical upright column;
4.2) sleeving a U-shaped rib on the cantilever steel, vertically hoisting the vertical upright column and placing the vertical upright column at the position where the U-shaped rib is arranged, wherein the U-shaped rib penetrates through the bottom plate of the upright column and is locked by a nut;
and 4.3) fixedly connecting the lug plate with the beam of the upper-layer structure by adopting bolts.
Preferably, after the support is connected with the floor slab, the support frames are welded on the front side and the rear side of the upright stanchions, and the bottom ends of the support frames are in close contact with the floor slab; and welding a reinforcing piece at the junction of the J-shaped top plate and the vertical rod.
Preferably, a plurality of pulling points are welded at the outer end of the cantilever section steel after the cantilever section steel is installed, a connecting ring is welded at the upper half part of the vertical upright post after the vertical upright post is installed, and two ends of the steel wire rope are respectively connected to the pulling points and the connecting ring.
Preferably, a preparation operation is further performed before the step 1, specifically: when the beam is poured, a sleeve is arranged on the beam and used for connecting and fixing a bolt of the vertical upright; when a floor slab is poured, arranging PVC pipes at positions corresponding to the support seats, and arranging U-shaped ribs when the support seats are installed; when the concrete outer wall is poured, a PVC pipe is also arranged at the position corresponding to the profile steel force transmission fixing frame, and the PVC pipe is used for arranging a stud bolt when the profile steel force transmission fixing frame is installed.
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
(1) according to the height of the existing window opening, the invention adopts a support heightening mode to fix one end of the overhanging section steel on the support and fix the other end of the overhanging section steel on the window opening section steel force transmission fixing frame, thereby avoiding the technical problem that the existing concrete wall section steel needs to penetrate through the wall when being overhung.
(2) The invention adopts a vertical upright post tensioning support mode, supports the section steel cantilever beam by the combined action of the floor slab of the lower-layer building structure, the concrete outer wall and the beam of the upper-layer building structure, solves the construction steps of pre-embedding connecting pieces on a shear wall and the beam when the traditional section steel is cantilevered, reduces the construction cost and simplifies the construction.
(3) The cantilever section steel is placed on the J-shaped top plate, so that the displacement of the cantilever section steel is limited, the stud bolt is directly screwed into the welding nut on the back of the J-shaped top plate, the cantilever section steel is fixed by combining the cover plate and the nut, and the connection between the cantilever section steel and the support is enhanced.
(4) According to the invention, the fixing device of the stud bolt and the section steel force transmission fixing frame is adopted on the existing concrete window, the traditional horizontal force is converted into the pulling force for vertically fixing the cantilever section steel, and the looseness of the cantilever section steel is avoided.
(5) The base of the support provided by the invention adopts a mode that U-shaped ribs penetrate and are fixed from the lower layer of the floor slab, so that the support is prevented from loosening.
Drawings
FIG. 1 is a schematic view of a section steel cantilever wall-through-free heightening and anchoring support structure;
FIG. 2 is a front view of a J-shaped top plate structure;
FIG. 3 is a back view of a J-top deck structure;
FIG. 4 is a schematic view of a connection structure of a J-shaped top plate and overhanging section steel;
FIG. 5 is a schematic view of a vertical column structure;
FIG. 6 is a schematic cross-sectional view A-A of the vertical column structure of FIG. 5;
FIG. 7 is a schematic view of the connection between the vertical upright post and the cantilever steel;
FIG. 8 is a schematic structural view of a force transmission fixing frame for section steel;
FIG. 9 is a schematic view of the connection structure of the force-transmitting fixture for profile steel and cantilever profile steel.
In the figure: 1. the concrete wall comprises a floor slab, 2 beams, 3 concrete outer walls, 4 windows, 5 supports, 501 bottom plates, 502J-shaped top plates, 5021 limiting blocks, 5022 welding nuts, 503 upright posts, 504 reinforcing members, 6 stud bolts, 7 cover plates, 8 supporting frames, 9U-shaped ribs, 11 cantilever section steels, 1101 pulling points, 12 vertical upright posts, 1201 ear plates, 1202 upright post bottom plates, 1203 upright posts, 1204 connecting rings, 13 sleeves, 14 bolts, 15 section steel force transmission fixing frames, 1501 limiting rods, 1502 force transmission fixing frames, 15021 bolt holes, 16 limiting section steels, 17 steel wires and 18 cover plates.
Detailed Description
For further understanding of the contents of the present invention, the present invention will be described in detail with reference to examples, which are provided for the purpose of explanation and are not intended to limit the present invention.
With reference to fig. 1, the cantilever support is arranged on the building structure in advance, the structural steel cantilever wall-penetration-free heightening and anchoring support system is adopted, and preparation work is required in the process of pouring the beam 2, the floor slab 1 and the concrete outer wall 3 of the building structure in order to facilitate the construction of the structural steel cantilever wall-penetration-free heightening and anchoring support system. Namely, when the beam 2 is poured, the sleeve 13 is arranged on the beam 2 and is used for connecting and fixing the bolt of the vertical upright 12; when the floor slab 1 is poured, arranging PVC pipes at positions corresponding to the support 5, and arranging U-shaped ribs 9 when the support 5 is installed; when the concrete outer wall 3 is poured, a PVC pipe is also arranged at the position corresponding to the section steel force transmission fixing frame 15 and is used for arranging the stud bolt 6 when the section steel force transmission fixing frame 15 is installed. The shaped steel is encorbelmented and is exempted from to wear wall and increase anchor support system and set up in window 4 department, and window 4 is down along 1m apart from gross land height.
The construction method of the section steel cantilever through-wall-free heightening and anchoring support system comprises the following steps:
1) installing a support 5 above the floor slab 1, wherein the concrete construction steps comprise:
1.1) manufacturing a support 5, welding a bottom plate 501 at the bottom end of an upright post 503, and welding a J-shaped top plate 502 at the top end of the upright post 503 to form the support 5, wherein the top end of the upright post 503 is 1m away from the ground; referring to fig. 2 and 3, two limiting blocks 5021 need to be welded on the upper surface of the bottom plate of the J-shaped top plate 502, and a welding nut 5022 is arranged on the lower surface of the bottom plate of the J-shaped top plate 502;
1.2) penetrating and bundling U-shaped ribs 9 at PVC pipes on a floor slab 1, wherein the U-shaped ribs 9 are formed by processing round steel with the diameter of 20mm, a bottom plate 501 of a support 5 is connected with the U-shaped ribs 9 which are pre-arranged on the floor slab 1 by nuts, so that the support 5 is connected with the floor slab 2, after the support 5 is connected with the floor slab 2, support frames 8 are welded on the front side and the rear side of an upright post 503, and the bottom ends of the support frames 8 are tightly contacted with the floor slab 2, so that the stability of the upright post 503 is improved; a reinforcement 504 is welded to the junction of the J-shaped top plate 502 and the upright 504 to increase the strength of the J-shaped top plate 502 to the upright 504, as shown in fig. 1.
2) A section steel force transmission fixing frame 15 is arranged below the window 4, and the method comprises the following specific steps:
2.1) welding a limiting rod 1501 above a force transmission fixing frame 1502 as shown in the attached drawing 8, wherein the limiting rod 1501 is divided into a front group and a rear group to form a section steel force transmission fixing frame 15, the limiting rod 1501 adopts round steel with the diameter of 16mm, the force transmission fixing frame 1502 is in an inverted U shape, and bolt holes 15021 are arranged on side plates on two sides;
2.2) with reference to fig. 9, a stud bolt 6 is threaded through a PVC pipe of the concrete outer wall 3, and the force transmission fixing frame 1502 is fixed on the concrete outer wall 3 at the lower edge of the window 4 through the stud bolt 6 in cooperation with a nut;
after the fixing frame 1502 is fixed on the concrete outer wall 3 at the lower edge of the window 4, the limiting section steel 16 is welded on the outer side surface of the force transmission fixing frame 1502, and the cantilever section steel 11 is prevented from inclining after being stressed.
3) Installing overhanging section steel 11, wherein the overhanging section steel 11 extends from the outer side of the window 4 to the inner side of the window 4, and the overhanging section steel 11 is erected above the section steel force transmission fixing frame 15 and the support 5; as shown in the attached figure 4, the inner end of the cantilever steel 11 is arranged between two limit blocks 5021, a cover plate 7 is arranged above the support 5, and the cover plate 7 is covered above the cantilever steel 11 and then the cover plate 7 and a welding nut 5022 are locked by a stud 6; as shown in fig. 9, the overhanging section steel 11 passes through two sets of limiting rods 1501, after the force transmission cover plate 18 is installed above the overhanging section steel 11, the force transmission cover plate 18 is locked at the end of the limiting rods 1501 by nuts, the middle part of the overhanging section steel 11 is further locked, and a plurality of pulling points 1101 are welded at the outer end of the overhanging section steel 11.
4) The vertical upright post 12 is installed, and the concrete steps are as follows:
4.1) connecting a column bottom plate 1202 at the bottom end of a column 1203, welding an ear plate 1201 at the top of the column 1203 to form a vertical column 12 as shown in fig. 5 and 6, and welding a connecting ring 1204 at the upper half part of the vertical column 12;
4.2) sleeving a U-shaped rib 9 on the overhanging section steel 11, wherein the U-shaped rib 9 is formed by processing round steel with the diameter of 20mm, the vertical upright post 12 is vertically lifted and placed at the position where the U-shaped rib 9 is arranged, the U-shaped rib 9 penetrates through the upright post bottom plate 1202, the upright post bottom plate 1202 is locked by a nut, and then the bottom end of the vertical upright post 12 is fixed with the overhanging section steel 11;
4.3) fixedly connecting the lug plate 1201 with the sleeve 13 on the beam 2 of the superstructure by using a bolt 14, thereby realizing the fixation of the top end of the vertical upright post 12 with the beam 2 of the superstructure, as shown in figure 7.
5) And a plurality of steel wire ropes 17 are used for connecting the pulling points 1101 and the connecting rings 1204, so that the outer ends of the cantilever steel sections 11 and the top ends of the vertical upright columns 12 are pulled.
The invention relates to a section steel cantilever wall-penetration-free heightening and anchoring support system which solves the problems of structural damage and later filling caused by a window opening section steel cantilever wall by adopting a support 5 heightening mode on the basis of the height of the existing window opening and the combination of a traditional cantilever section steel support method, and solves the problems of high construction cost and difficult construction of pre-buried connecting pieces on the traditional shear wall and beam by adopting a vertical upright post 12 tensioning support mode.
The present invention has been described in detail with reference to the embodiments, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (8)
1. The construction method of the section steel cantilever through-wall-free heightening and anchoring support system is characterized by comprising the following steps of:
1) a support (5) is arranged above the floor (1);
2) a section steel force transmission fixing frame (15) is arranged along the lower edge of the window (4);
3) installing overhanging section steel (11), wherein the overhanging section steel (11) extends to the inner side of a window (4) from the outer side of the window (4), the overhanging section steel (11) is erected above a section steel force transmission fixing frame (15) and a support (5), a force transmission cover plate (18) is installed on the section steel force transmission fixing frame (15) to lock the middle part of the overhanging section steel (11), and the inner end of the overhanging section steel (11) is locked by a cover plate (7) is installed above the support (5);
4) mounting a vertical upright post (12), wherein the bottom end of the vertical upright post (12) is fixed with the cantilever steel (11), and the top end of the vertical upright post is fixed with a beam (2) of an upper layer structure;
5) the outer end of the cantilever steel section (11) and the top end of the vertical upright post (12) are pulled and connected by a plurality of steel wire ropes (17).
2. The construction method of the section steel cantilever wall-through heightening and anchoring-free support system according to claim 1, characterized in that: the step 1) of installing the support (5) comprises the following specific steps:
1.1) manufacturing a support (5), namely welding a bottom plate (501) at the bottom end of an upright rod (503), welding a J-shaped top plate (502) at the top end of the upright rod (503) to form the support (5), welding two limiting blocks (5021) on the upper surface of the bottom plate of the J-shaped top plate (502), and arranging a welding nut (5022) on the lower surface of the bottom plate of the J-shaped top plate (502);
1.2) connecting a bottom plate (501) of the support (5) with a U-shaped rib (9) which is arranged on the floor slab (1) in advance by adopting a nut to realize the connection of the support (5) and the floor slab (2);
when the cantilever type steel (11) is installed, the inner end of the cantilever type steel (11) is installed between the two limit blocks (5021), and the cover plate (7) and the welding nut (5022) are locked by the stud bolt (6) after the cover plate (7) covers the upper portion of the cantilever type steel (11).
3. The construction method of the section steel cantilever wall-through heightening and anchoring-free support system according to claim 1, characterized in that: the step 2) of installing the profile steel force transmission fixing frame (15) below the window (4) comprises the following specific steps:
2.1) welding a limiting rod (1501) above the force transmission fixing frame (1502), wherein the limiting rod (1501) is divided into a front group and a rear group to form a profile steel force transmission fixing frame (15);
2.2) fixing the force transmission fixing frame (1502) on the concrete outer wall (3) at the lower edge of the window (4) through the stud bolt (6);
when the cantilever type steel (11) is installed, the cantilever type steel (11) penetrates through the two groups of limiting rods (1501), and after the force transmission cover plate (18) is installed above the cantilever type steel (11), the force transmission cover plate (18) is locked at the end part of the limiting rods (1501) through nuts.
4. The construction method of the section steel cantilever wall-through heightening and anchoring-free support system according to claim 3, characterized in that: and after the fixed frame (1502) is fixed on the concrete outer wall (3) at the lower edge of the window (4), the outer side surface of the force transmission fixed frame (1502) is welded with a limiting section steel (16).
5. The construction method of the section steel cantilever wall-through heightening and anchoring-free support system according to claim 1, characterized in that: the step 4) of installing the vertical upright post (12) comprises the following specific steps:
4.1) connecting an upright column bottom plate (1202) at the bottom end of an upright column (1203), and welding an ear plate (1201) at the top of the upright column (1203) to form a vertical upright column (12);
4.2) sleeving a U-shaped rib (9) on the cantilever steel (11), vertically hoisting the vertical upright (12) and placing the vertical upright at the position where the U-shaped rib (9) is arranged, wherein the U-shaped rib (9) penetrates through the upright bottom plate (1202), and the upright bottom plate (1202) is locked by a nut;
and 4.3) fixedly connecting the lug plate (1201) with the beam (2) of the upper-layer structure by adopting a bolt (14).
6. The construction method of the section steel cantilever wall-penetration-free heightening and anchoring support system according to claim 2, characterized in that: after the support (5) is connected with the floor (2), the support frames (8) are welded on the front side and the rear side of the upright (503), and the bottom ends of the support frames (8) are tightly contacted with the floor (2); and welding a reinforcing member (504) at the interface of the J-shaped top plate (502) and the upright rod (503).
7. The construction method of the section steel cantilever wall-through heightening and anchoring-free support system according to claim 1, characterized in that: a plurality of pulling points (1101) are welded at the outer end of the cantilever steel section (11) after the cantilever steel section (11) is installed, a connecting ring (1204) is welded at the upper half part of the vertical upright post (12) after the vertical upright post (12) is installed, and two ends of a steel wire rope (17) are respectively connected to the pulling points (1101) and the connecting ring (1204).
8. The construction method of the section steel cantilever wall-through heightening and anchoring-free support system according to claim 1, characterized in that: before the step 1, preparation work is also carried out, specifically: when the beam (2) is poured, a sleeve (13) is arranged on the beam (2) and used for connecting and fixing a bolt of the vertical upright (12); when the floor slab (1) is poured, arranging PVC pipes at positions corresponding to the support (5) for arranging U-shaped ribs (9) when the support (5) is installed; when the concrete outer wall (3) is poured, a PVC pipe is arranged at the position corresponding to the section steel force transmission fixing frame (15) and is used for arranging the stud bolt (6) when the section steel force transmission fixing frame (15) is installed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910938757.8A CN110629996A (en) | 2019-09-30 | 2019-09-30 | Construction method of profile steel cantilever through-wall-free heightening and anchoring support system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910938757.8A CN110629996A (en) | 2019-09-30 | 2019-09-30 | Construction method of profile steel cantilever through-wall-free heightening and anchoring support system |
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| CN110629996A true CN110629996A (en) | 2019-12-31 |
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| CN201910938757.8A Withdrawn CN110629996A (en) | 2019-09-30 | 2019-09-30 | Construction method of profile steel cantilever through-wall-free heightening and anchoring support system |
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| CN113685014A (en) * | 2021-08-26 | 2021-11-23 | 中天建设集团有限公司 | Downward-returning type cantilever frame supporting beam mounting structure and mounting method |
| CN114622709A (en) * | 2022-03-30 | 2022-06-14 | 中建四局第一建设有限公司 | Turnover cantilever structure for structural height difference part and construction method thereof |
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