CN116005960A - Cantilever structure piecewise hoisting and air embedding combined construction method - Google Patents
Cantilever structure piecewise hoisting and air embedding combined construction method Download PDFInfo
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- CN116005960A CN116005960A CN202310136096.3A CN202310136096A CN116005960A CN 116005960 A CN116005960 A CN 116005960A CN 202310136096 A CN202310136096 A CN 202310136096A CN 116005960 A CN116005960 A CN 116005960A
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Abstract
The invention relates to a construction method combining cantilever structure slice hoisting and aerial embedding, which comprises a plurality of splicing units and embedding members positioned in the splicing units, and comprises the following steps: each splicing unit is prefabricated; and correspondingly hoisting and fixing the plurality of embedded components into the plurality of splicing units from top to bottom, wherein the embedded components at the topmost layer are hoisted and constructed by using a tower crane, and then the hoisting construction of the next embedded component is performed by using the fixed embedded component at the upper layer in cooperation with the hoisting device until the hoisting construction of all embedded components is completed. The invention solves the technical problem that the lower cantilever structure is easy to deform greatly due to load accumulation in the prior art in a scattered splicing and welding mode of the steel structure cantilever structure in the air of the tower crane.
Description
Technical Field
The invention relates to the field of building construction, in particular to a construction method combining cantilever structure slice hoisting and air embedding.
Background
Along with the development of building technology, the design of high-rise buildings is increasingly developed towards comprehensive multipurpose, the structural body type of the high-rise buildings is further complicated, the multifunctional use requirement of the buildings causes the diversification of structural body types and structural forms, and the novel building shapes give a visual impact sense to people, but simultaneously make a plurality of problems for the construction of the building structures, especially in the construction of super high-rise steel structures with overhanging structures, which has the advantages of compact construction period and heavy tasks, the reasonable and optimized construction method can shorten the construction period to a certain extent, the construction cost is saved, and the method is the most focused problem.
In the prior art, the steel structure overhanging structure is conventionally assembled and welded by using the tower crane in a scattered manner, the hook is loosened after the installation and welding are completed, a large amount of tower crane hoisting time is occupied, the construction period is greatly influenced, meanwhile, the lower overhanging structure is greatly deformed due to gradual accumulation of loads, the installation of the subsequent overhanging structure is influenced, and the safety of the whole overhanging structure is influenced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a construction method combining the piecewise hoisting and the aerial embedding of the cantilever structure, which solves the technical problem that the lower cantilever structure is easy to deform greatly due to load accumulation in the way of splicing and welding the steel structure in the air of a tower crane in the prior art.
The invention discloses a construction method combining cantilever structure slice hoisting and air embedding, which comprises the following steps:
the overhanging structure comprises a plurality of splicing units and embedded members positioned in the splicing units, and the construction method comprises the following steps:
each splicing unit is prefabricated;
hoisting a plurality of splicing units from bottom to top in a layering manner, and fixing the splicing units on a building main body;
installing a hoisting device in the building main body;
and correspondingly hoisting and fixing the plurality of embedded components into the plurality of splicing units from top to bottom, wherein the embedded components at the topmost layer are hoisted and constructed by using a tower crane, and then the hoisting construction of the next embedded component is performed by using the fixed embedded component at the upper layer in cooperation with the hoisting device until the hoisting construction of all embedded components is completed.
The invention discloses a construction method for combining cantilever structure piecewise hoisting and aerial embedding, which is further improved in that a splicing unit comprises a plurality of splicing components, at least one splicing component is provided with a strain gauge, the splicing components are sequentially hoisted and fixed on a building main body during hoisting, then the splicing components are mutually fixed to form the splicing units, a deformation space is reserved between adjacent splicing units, and the deformation condition of each splicing unit is monitored through the strain gauge.
The cantilever structure slice hoisting and air embedding combined construction method is further improved in that the splicing units comprise a plurality of upright posts, and when the monitoring result of the strain gauge shows that the deformation condition is stable, the upright posts of two adjacent splicing units are fixed.
The invention relates to a construction method combining cantilever structure piecewise hoisting and air embedding, which is further improved in that a plurality of strain gauges are distributed on each splicing unit, and before each splicing unit is manufactured, finite element software is used for simulating the structural stress and end displacement of each splicing unit in different states in the whole construction stage, a finite element model is built, and the distribution position of each strain gauge is obtained through analysis.
The invention relates to a construction method combining cantilever structure slice hoisting and aerial embedding, which is further improved in that the hoisting device is a winch, the winch is fixed on a steel column of a building main body in an encircling manner, after the hoisting of the embedded component at the topmost layer is completed, a fixed pulley is arranged on the embedded component at the topmost layer, a hoisting rope of the winch bypasses the fixed pulley to carry out hoisting construction of the embedded component at the next layer, after the hoisting construction of the embedded component at the next layer is completed, the embedded component at the next layer is used as the embedded component at the last layer, the fixed pulley is transferred and arranged on the embedded component at the last layer, and then the hoisting construction of the embedded component at the new next layer is carried out.
The invention further improves the construction method combining the cantilever structure slice hoisting and the aerial embedding, which comprises the steps of constructing a jig frame on the ground before manufacturing each splicing unit, and manufacturing each splicing unit on the jig frame.
Compared with the prior art, the invention has positive and obvious effects. According to the invention, through a hoisting mode of combining split unit assembly with hoisting machine installation and embedding components, the hoisting construction time is shortened, and the technical problem that the lower cantilever structure is easy to deform greatly due to load accumulation in the mode of using tower crane in-air split assembly welding for the steel structure cantilever structure in the prior art is solved. The method utilizes the tower crane to install the unit frame and utilizes the winch to install the embedded component, thereby greatly reducing the time of the overhanging construction occupying the tower crane, avoiding the extra maintenance operation caused by deformation and shortening the construction period and the cost.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of the steps of the construction method combining the cantilever structure slice hoisting and the aerial embedding.
Fig. 2 is a schematic diagram of a splicing unit of the construction method combining the cantilever structure slice hoisting and the aerial embedding.
Fig. 3 is a schematic diagram of hoisting a steel beam by the method for constructing the cantilever structure by combining the split hoisting and the aerial embedding.
Fig. 4 is a second schematic view of hoisting a horizontal steel girder by the method for constructing the cantilever structure by combining the split hoisting and the aerial embedding.
Fig. 5 is a schematic view of lifting a ladder beam by combining the construction method of the cantilever structure slice lifting and the aerial embedding.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1 and 2, the invention provides a construction method combining the split hoisting and the aerial embedding of an overhanging structure 2, wherein the overhanging structure comprises a plurality of splicing units and embedding members positioned in the splicing units, and the construction method comprises the following steps:
each of the splice units 2 is prefabricated;
hoisting a plurality of splicing units 2 from bottom to top in layers and fixing the splicing units to a building main body;
a hoisting device is arranged in the building main body 1;
and correspondingly hoisting and fixing a plurality of embedded components from top to bottom into a plurality of splicing units 2, wherein the embedded components at the topmost layer are hoisted and constructed by using a tower crane, and then the hoisting construction of the next embedded component is performed by using the fixed embedded component at the upper layer in cooperation with the hoisting device until the hoisting construction of all embedded components is completed. In the embodiment, the cantilever structure is segmented according to the performance of the tower crane to form the unit external frame, the pre-assembled is carried out on the ground, the tower crane times are reduced, the construction period is shortened, the embedded components in the frame are hoisted in an auxiliary manner through the hoisting mode of the hoisting device, and the problem of safety caused by overlarge weight of the whole cantilever structure hoisted by the tower crane is avoided. The method utilizes finite element analysis software MIDAS to simulate and analyze the maximum deformation point of the splicing unit on the overhanging structure in advance, carries out fixed-point timing monitoring on the least favorable point according to the simulation result, achieves the purpose of simulating and analyzing in advance, controls in advance, and ensures that the deformation of the structure is digested in each unit. The principle can better provide prospective guidance for field operation installation and ensure the structural safety. The method adopts a hoisting mode of combining unit block assembly and installation of the embedded component by the winch 4, utilizes the tower crane to install the structural frame, utilizes the winch 4 to install the embedded component, greatly reduces the time of the tower crane occupied by overhanging construction, and is suitable for a structure with more inner secondary structures of the overhanging structure 2.
Preferably, the splice unit 2 includes a plurality of splice assemblies, and installs the strainometer on at least one splice assembly, hoist and mount splice assembly in proper order and be fixed to the building main part during the hoist and mount, fix splice assembly each other again, form this splice unit 2, leave the deformation space between the adjacent splice unit 2, monitor the deformation condition of every this splice unit 2 through this strainometer. The splicing components are manufactured on the ground, and are installed and fixed in the air through the tower crane, so that complex operation of hoisting and installing single steel is avoided, and the installation efficiency is improved. When the splicing components are fixed with each other, the upright posts of the splicing components are not fixed temporarily, so that deformation spaces are reserved between adjacent splicing units 2, and other parts are fixed first. Before the splicing unit 2 is manufactured, each splicing component is numbered according to the installation sequence, the splicing components are hoisted by a tower crane according to the number sequence, and are fixed with the building main body 1 by using a steel wire rope after being in place, and then correction and adjustment are performed by using a chain block, so that the installation precision of the splicing components is ensured. After each assembly component is calibrated and checked to be correct, the assembly components are welded according to the design requirement. After each assembly component is inspected to meet the design requirement and all welding seams are carefully inspected to meet the requirement, the assembly component can be separated from the tower crane steel wire rope.
The method is very important in the temporary fixation of each structure in the construction process, can facilitate the positioning and correction of the splicing assembly during hoisting, reduce the correction time and ensure the stability of the splicing assembly. Furthermore, a splicing assembly locating clamping plate can be arranged on the upper portion of the steel beam of each splicing assembly, so that the splicing assemblies can be conveniently and directly installed in place. And after the splicing components are installed, the end parts of the splicing components are prevented from being scratched, and the end parts of the splicing components are provided with steel wire ropes which are fixed with the steel columns of the installed building main body 1. The girder steel top flange of the splicing component is provided with a vertical rod type safety rope, the vertical rod is fixed with the girder steel by adopting a clamp, welding is avoided, parent metal is damaged, and the safety rope adopts a basket of flowers bolt to adjust looseness. The operator ties the safety belt, hangs the safety belt on the steel wire rope, and performs unhooking operation. And welding the steel columns and the steel beams of the two adjacent splicing assemblies on site, and constructing by adopting a high-altitude hanging basket. After the vertical splicing components are installed in place, in order to ensure the out-of-plane rigidity of the vertical splicing components, the horizontal steel beams 3 between the splicing components are installed in place to form a stable frame system, after the lower-layer splicing units 2 are installed, the upper-layer splicing units 2 are installed, and before the upper-layer splicing units 2 are installed, all lower components are required to be welded. And after the second layer of assembling units are installed, welding the assembling units and the steel columns of the main building structure 1.
If the overhanging structure is also provided with a banding structure, a tower crane is used for installing a steel beam of the banding structure, and then a beam embedded in the banding structure is installed by using a winch 4. If the cantilever structure is additionally provided with the outer side blocks, after the six layers of cantilever structures connected with the main building structure 1 are installed, the outer side blocks are installed, and after the installation of the vertical blocks on the cantilever outer side is completed, the embedded cross beam is installed.
And sequentially installing the overhanging structures of the upper layer according to the installation sequence. And each layer of overhanging structure is integrally installed, and a steel bar truss floor support plate is timely installed, so that the horizontal floor is closed. And after the construction of each three layers of overhanging steel structures is finished, concrete pouring is carried out on the floor support plate.
Preferably, the splicing unit comprises a plurality of upright posts, and when the monitoring result of the strain gauge shows that the deformation condition is stable, the upright posts of two adjacent splicing units are fixed. Therefore, deformation generated after the cantilever structure is completely installed is reduced, and the stability of the whole cantilever structure is affected.
Preferably, a plurality of strain gauges are uniformly distributed on each splicing unit 2, structural stress and end displacement of each splicing unit 2 in different states of the whole construction stage are simulated before each splicing unit 2 is manufactured, a finite element model is built, and the distribution position of each strain gauge is obtained through analysis. According to the method, finite element analysis software MIDAS is utilized to sequentially conduct stress and deformation analysis on the mounting unit on each cantilever structure under the first lifting working condition, the first stacking working condition, the last lifting working condition, the last stacking working condition and the working condition after the whole mounting is completed, the maximum deformation point is found out, and the vibrating wire type surface strain gauge is mounted at the maximum deformation point, so that the deformation condition at each maximum deformation point can be reflected timely, countermeasures can be timely made, and the stability of the whole cantilever structure is guaranteed.
Preferably, the hoisting device is a hoist 4, and before the plurality of embedded components are hoisted into the splicing unit 2 from top to bottom by the hoisting device, the hoist 4 is fixed on a steel column of the building main body 1 by adopting a steel frame in a surrounding manner. In this embodiment, the hoist 4 is fixed on the floor slab of the main building structure 1 corresponding to the assembly unit at the bottommost layer, the base of the hoist 4, the steel column and the floor slab are welded and fixed together by using the steel frame, and the installation construction of the embedded members with different heights is controlled by adjusting the length of the lifting rope.
Preferably, as shown in fig. 3 to 5, after the hoisting of the uppermost layer of the repair member is completed, a fixed pulley is mounted on the uppermost layer of the repair member, the hoisting rope of the hoist 4 is wound around the fixed pulley to carry out the hoisting of the next layer of the repair member, after the hoisting of the next layer of the repair member is completed, the next layer of the repair member is used as the upper layer of the repair member, the fixed pulley is transferred and mounted on the upper layer of the repair member, and then the hoisting of the new next layer of the repair member is carried out. In order to avoid collision between the steel wire rope of the winch 4 and the installed main body structure, the requirement of arranging a steel wire rope steering node on the main body structure is met by arranging a fixed pulley. The steering node of the steel wire rope is required to be reliably connected with the main body, and a hand hoist is arranged on the lifting rope to adjust the aerial posture of the lifting rope of the winch 4. When the steel beam is installed, the top-layer embedded component is directly installed in place by using the tower crane, after the embedded component is welded, a pulley is arranged in the middle of the embedded component and is positioned right above the gravity center of the lower embedded component, so that the embedded component is prevented from being damaged or colliding with other structures in the hoisting process. In this embodiment, the lifting rope is a steel wire rope, and the embedded member includes a horizontal steel beam 3 and a stair beam 5 in the overhanging structure region.
Preferably, before each splicing unit 2 is manufactured, a jig frame is set up on the ground, and each splicing unit 2 is manufactured on the jig frame. The jig frame is assembled by adopting section steel with the section size not smaller than H500 x 200 x 10 x 14, and the material is Q235B. When the jig frame is arranged, a profile steel horizontal jig frame is paved according to X, Y projection points after coordinate transformation, projection lines, elevation lines, inspection lines and fulcrum positions of X, Y are laid after the profile steel horizontal jig frame is paved, then straight rods of the jig frame are erected (steel columns and steel beams of the assembling units are different in section height, and a stacking plate can be used for supporting) and jig frame templates are arranged according to elevation of the fulcrum positions. The setting of bed-jig should accord with corresponding piecemeal overall dimension, and the minimum department of bed-jig height should be satisfied all-position welding in addition and need highly, the bed-jig must have obvious shaking form after setting up.
The strain gauge can transmit back real-time data, and the frequency value of the strain gauge is converted into a strain unit of the rod piece by utilizing an inherent conversion formula of the strain gauge and a formula of pre-closing and checking, and then converted into end deflection perpendicular to the direction of the rod piece. Thereby grasping the deformation condition of the end of the member.
The strain gauge is an AIOT-CCP-ZXS-CGQ-YB-03 vibrating wire type surface strain gauge (standard type), and the strain gauge rate coefficient is as follows: k= 3.978, assuming that the calculation formula is used with AIOT-CCP-ZXS-CJY-SC-01 type reader 400-1200:
epsilon (microstrain) =k (f i 2 -f o 2 )/1000
And obtaining the strain value in the measurement area.
K is the standard coefficient of the instrument, f o Initial reading, f i : current reading, in Hz; temperature coefficient and temperature factor correction of the instrument: the strain gauge is installed on a steel structure and does not need to be corrected if being in full length, and the steel string of the sensor and the steel structure have the same temperature expansion coefficient, so the strain gauge can not be corrected.
According to the invention, through a hoisting mode of combining split unit assembly with hoisting machine installation and embedding components, the hoisting construction time is shortened, and the technical problem that the lower cantilever structure is easy to deform greatly due to load accumulation in the mode of using tower crane in-air split assembly welding for the steel structure cantilever structure in the prior art is solved. The method utilizes the tower crane to install the unit frame and utilizes the winch to install the embedded component, thereby greatly reducing the time of the overhanging construction occupying the tower crane, avoiding the extra maintenance operation caused by deformation and shortening the construction period and the cost. And when the monitoring result shows that the downwarping of the splicing units is stable, and larger deformation is not generated any more, welding the reserved upright post welding seams between the adjacent splicing units.
None of the inventions are related to the same or are capable of being practiced in the prior art. The present invention is not limited to the above-mentioned embodiments, but is not limited to the above-mentioned embodiments, and any simple modification, equivalent changes and modification made to the above-mentioned embodiments according to the technical matters of the present invention can be made by those skilled in the art without departing from the scope of the present invention.
Claims (6)
1. The construction method combining the cantilever structure slice hoisting and the aerial embedding is characterized in that the cantilever structure comprises a plurality of splicing units and embedding members positioned in the splicing units, and the construction method comprises the following steps:
each splicing unit is prefabricated;
hoisting a plurality of splicing units layer by layer from bottom to top, and fixing the splicing units on a building main body;
installing a hoisting device in the building main body;
and correspondingly hoisting and fixing the plurality of embedded components to the inside of the splicing units from top to bottom, wherein the embedded components at the topmost layer are hoisted and constructed by using a tower crane, and then the hoisting construction of the next embedded component is performed by using the fixed embedded component at the upper layer in cooperation with the hoisting device until the hoisting construction of all embedded components is completed.
2. The construction method combining the cantilever structure slice hoisting and the aerial embedding according to claim 1, wherein the splicing units comprise a plurality of splicing components, at least one splicing component is provided with a strain gauge, the splicing components are hoisted in sequence and fixed on a building main body during hoisting, the splicing components are fixed with each other to form the splicing units, a deformation space is reserved between adjacent splicing units, and the deformation condition of each splicing unit is monitored through the strain gauge.
3. The construction method combining the cantilever structure slice hoisting and the aerial embedding according to claim 2, wherein the splicing units comprise a plurality of stand columns, and when the monitoring result of the strain gauge shows that the deformation condition is stable, the stand columns of two adjacent splicing units are fixed.
4. The construction method combining the cantilever structure slice hoisting and the aerial embedding and supplementing according to claim 1, wherein a plurality of strain gauges are distributed on each splicing unit, and before each splicing unit is manufactured, the structural stress and the end displacement of each splicing unit in different states in the whole construction stage are simulated by using finite element software, a finite element model is built, and the distribution position of each strain gauge is obtained through analysis.
5. The method for constructing the cantilever structure by combining the split hoisting and the aerial embedding and repairing according to claim 1, wherein the hoisting device is a winch, the winch is fixed on a steel column of a building main body in a surrounding manner, a fixed pulley is arranged on the embedding and repairing member on the topmost layer after the hoisting of the embedding and repairing member on the topmost layer is completed, a hoisting rope of the winch bypasses the fixed pulley to carry out hoisting construction of the embedding and repairing member on the next layer, the next layer of embedding and repairing member is used as an upper layer of embedding and repairing member after the hoisting construction of the next layer of embedding and repairing member is completed, the fixed pulley is transferred and arranged on the upper layer of embedding and repairing member, and then the hoisting construction of a new next layer of embedding and repairing member is carried out.
6. The method for constructing the cantilever structure by combining the split hoisting and the aerial embedding as claimed in claim 1, wherein a jig frame is built on the ground before each splicing unit is manufactured, and each splicing unit is manufactured on the jig frame.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310136096.3A CN116005960A (en) | 2023-02-20 | 2023-02-20 | Cantilever structure piecewise hoisting and air embedding combined construction method |
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| CN202310136096.3A CN116005960A (en) | 2023-02-20 | 2023-02-20 | Cantilever structure piecewise hoisting and air embedding combined construction method |
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