CN114892813A - Large-span building main body supporting steel structure and construction method - Google Patents

Large-span building main body supporting steel structure and construction method Download PDF

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CN114892813A
CN114892813A CN202210536558.6A CN202210536558A CN114892813A CN 114892813 A CN114892813 A CN 114892813A CN 202210536558 A CN202210536558 A CN 202210536558A CN 114892813 A CN114892813 A CN 114892813A
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hoisting
main arch
arch truss
latticed shell
truss
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CN114892813B (en
Inventor
李明科
韩友强
薛恒岩
乔广宇
曹凤新
杜焕宇
周彦春
赵华颖
刘学帅
杨海龙
李里
刘玉峰
姜锐杰
陈小茹
温泽坤
郑颖
房世鹏
李伟伟
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Third Construction Engineering Co Ltd of China Construction Second Engineering Bureau Co Ltd
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Third Construction Engineering Co Ltd of China Construction Second Engineering Bureau Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04BGENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/342Structures covering a large free area, whether open-sided or not, e.g. hangars, halls
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04BGENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/19Three-dimensional framework structures
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04BGENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/38Connections for building structures in general
    • E04B1/58Connections for building structures in general of bar-shaped building elements
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04BGENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B7/00Roofs; Roof construction with regard to insulation
    • E04B7/08Vaulted roofs
    • E04B7/10Shell structures, e.g. of hyperbolic-parabolic shape; Grid-like formations acting as shell structures; Folded structures
    • E04B7/102Shell structures
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/14Conveying or assembling building elements
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/14Conveying or assembling building elements
    • E04G21/16Tools or apparatus

Abstract

The invention provides a main body supporting steel structure of a large-span building and a construction method, and relates to the field of large-span buildings. The large-span building main body supporting steel structure and the construction method comprise a main arch truss, wherein a single-layer latticed shell is installed and connected on the main arch truss, the single-layer latticed shell is installed after the main arch truss is installed, and the main arch truss embedded and repaired rod piece is welded through an inner underpass facility of the main arch truss. According to the large-span building main body supporting steel structure and the construction method, the main arch truss and the single-layer latticed shell are respectively divided into the plurality of modules, assembly is quickly realized by utilizing a combination mode of assembly, block hoisting and embedded rod piece installation, and then the hoisting equipment is directly utilized to assist the assembly to complete integral construction and installation, so that the integral large-span building structure can quickly, stably and firmly complete construction, the construction time is effectively shortened, and the good stability of a construction building can be greatly ensured.

Description

Large-span building main body supporting steel structure and construction method
Technical Field
The invention relates to the field of large-span buildings, in particular to a main body supporting steel structure of a large-span building and a construction method.
Background
The large-span building generally refers to a building with a span of more than 30m, and the structure with a span of more than 60m is specified by the current steel structure specification in China as a large-span structure. The building is mainly used for movie theaters, stadiums, exhibition halls, airports and other large public buildings of civil buildings. The method is mainly used for aircraft assembly workshops, hangars and other large-span plants in industrial buildings. The large-span building structure comprises basic space structures such as a grid structure, a reticulated shell structure, a suspended cable structure, a truss structure, a membrane structure, a thin shell structure and the like, and various combined space structures.
In the work progress of current large-span building main part support steel construction, because steel construction can have some conflicts with membrane structure or civil engineering specialty among the great majority large-span building main part, can not be fine harmonize the cross work of each specialty in the work progress, be difficult to guarantee that the construction cooperation is smooth to go on to directly lead to the construction progress slower, influence building construction period, and be difficult to guarantee that the construction building is enough firm.
Therefore, it is necessary to provide a new supporting steel structure for a large-span building main body and a construction method thereof to solve the above technical problems.
Disclosure of Invention
In order to solve the technical problems, the invention provides a large-span building main body supporting steel structure and a construction method.
The invention provides a large-span building main body supporting steel structure, which comprises: the main arch truss comprises a main arch truss, the span of the main arch truss is 150-160 meters, a single-layer reticulated shell is installed and connected on the main arch truss, the span of the single-layer reticulated shell is 190-200 meters, the single-layer reticulated shell is installed after the main arch truss is installed, and the main arch truss is welded with the embedded rod through an inner underpass facility of the main arch truss.
Preferably, the main arch truss is constructed by adopting a mode of assembling vertically on the ground, hoisting in sections and assembling the middle parts of two sides of the built-in installation; the single-layer latticed shell is installed in the mode of small-unit modular assembly, block hoisting and embedded rod piece installation.
Preferably, the main arch truss is divided into 11 segments, and the single-layer latticed shell is divided into 4 large-area 23 hoisting units; the main arch truss and the single-layer latticed shell are assembled by adopting a 25-ton truck crane; the hoisting of the main arch adopts a 400-ton crawler crane to hoist 11 units, the hoisting installation mode adopts a construction method of firstly constructing two sides and then constructing in the middle from bottom to top, and finally, the hoisting installation mode is carried out in a folding mode at the middle section; the single-layer latticed shell is installed in a block-by-block mode by adopting a 500-ton crawler crane; the embedded rod pieces are installed by adopting 25t, 50t and 130t truck cranes.
Preferably, the block units of the main arch truss and the block units of the single-layer latticed shell are hoisted in modes of sling binding and steel wire rope hoisting, and different hoisting riggings are selected according to hoisting weight.
Preferably, before hoisting and installation, site construction operation conditions are sufficiently analyzed, and the walking route of the crawler crane, a component assembling site, a material storage yard and an outfield transfer site need to be separately processed.
Preferably, the main arch truss and the single-layer latticed shell are installed, a standard knot installation jig frame is arranged in a field, and the installation jig frame uses standard knots of 60 and 40 tower cranes as main bearing units; the supporting system of the main arch truss and the single-layer latticed shell is divided into 117 groups, wherein the 117 groups are respectively arranged on a top plate 24 group of a basement, a source-ground second-layer bottom plate 4 group, a source-ground fifth-layer bottom plate 1 group, a source-ground sixth-layer bottom plate 5 group and a source-ground roof layer bottom plate 3 group, concentric back jacking is adopted for temporary supporting and reinforcing in the area, the position of a platform at the bottom of a jig frame is adjusted according to model lofting, the platform is located at the positions of a civil beam and a civil column as far as possible, and if the platform cannot be located at the position of a concrete column, concentric back jacking reinforcement is carried out on the beam plate.
Preferably, the main arch truss and the single-layer latticed shell are assembled in a horizontal assembly mode, the assembly uses the section steel as an assembly jig, a positioning cutting board is arranged above the assembly and used for positioning the rod piece, the positioning of the steel casting is preferentially carried out, then the structural assembly is sequentially completed from top to bottom, and the welding operation from top to bottom is carried out after the re-check is completed.
In order to achieve the purpose, the invention also provides a construction method of the main body support steel structure of the large-span building, which comprises the following steps:
s1, firstly, selecting hoisting equipment according to parameters of the main arch truss and the single-layer latticed shell, and analyzing hoisting conditions;
s2, selecting different hoisting riggings according to hoisting weight, calculating binding and hoisting numerical values, calculating hoisting numerical values of lifting lugs, and selecting hoisting snap rings according to hoisting loads;
s3, fully analyzing the operation conditions of site construction, and individually processing the walking route of the crawler crane, the component assembling site, the material yard and the outfield transfer site;
s4, installing temporary facilities for the main arch truss and the single-layer latticed shell, assembling the jig frames of the main arch truss and the single-layer latticed shell, arranging the installation jig frames of the main arch truss and the single-layer latticed shell, adjusting the position of a platform at the bottom of the jig frame, locating the platform at the positions of a civil engineering beam and a civil engineering column, and performing concentric back-jacking reinforcement on the beam slab;
s5, after the main arch truss and the single-layer latticed shell are hoisted in place, a toppling prevention measure is pertinently taken;
s6, sequentially completing structural assembly of the main arch truss and the single-layer latticed shell from top to bottom in a horizontal assembly mode, and performing welding operation from top to bottom after recheck and error-free assembly is completed;
s7, safety check preparation is carried out before hoisting, then a crane drives in hoisting station sites of the main arch truss and the single-layer latticed shell, trial hoisting is carried out on the main arch truss and the single-layer latticed shell, the main arch truss and the single-layer latticed shell are hoisted in place, after the main arch truss and the single-layer latticed shell are in place, correction and reinforcement are carried out on the main arch truss and the single-layer latticed shell, an embedded rod piece is hoisted in place, closure section construction is carried out on the main arch truss and the single-layer latticed shell, and the main arch truss and the single-layer latticed shell are welded on site;
and S8, unloading the supporting columns in a cutting board grading cutting unloading mode after all the structures are completed.
Compared with the prior art, the large-span building main body supporting steel structure and the construction method provided by the invention have the following beneficial effects:
the invention provides a large-span building main body supporting steel structure and a construction method, wherein a main arch truss and a single-layer latticed shell are respectively divided into a plurality of modules, the assembly is quickly realized by utilizing a combination mode of assembly, block hoisting and embedded rod piece installation, then, hoisting equipment is directly utilized to assist the assembly to complete the integral construction installation, the cross work of each specialty can be coordinated in the construction process, the construction of the integral large-span building structure can be quickly, stably and firmly completed, the construction time is effectively shortened, and the good stability of a construction building can be greatly ensured.
Drawings
Fig. 1 is a schematic structural view of a preferred embodiment of a large-span building main body supporting steel structure provided by the present invention;
fig. 2 is a schematic structural view of a support frame of a main arch truss according to a preferred embodiment of a main body support steel structure of a large-span building provided in the present invention;
fig. 3 is a schematic structural view of a support frame of a single-layer reticulated shell of a preferred embodiment of a large-span building main body support steel structure provided by the present invention;
fig. 4 is a plan view of the caulking rod piece of a preferred embodiment of a large-span building main body supporting steel structure provided by the invention.
Reference numbers in the figures: 1. a main arch truss; 2. a single layer reticulated shell.
Detailed Description
The invention is further described with reference to the following figures and embodiments.
Referring to fig. 1 to 4, a main supporting steel structure for a large-span building includes: the main arch truss comprises a main arch truss 1, wherein the span of the main arch truss 1 is 150-160 m, a single-layer reticulated shell 2 is installed and connected on the main arch truss 1, the span of the single-layer reticulated shell 2 is 190-200 m, the single-layer reticulated shell 2 is installed after the main arch truss 1 is installed, and an embedded rod of the main arch truss 1 is welded through an inner bridge facility of the main arch truss 1.
In the specific implementation process, as shown in fig. 1, the main arch truss 1 is installed by adopting a mode of assembling vertically on the ground, hoisting in sections and assembling at the two sides of the mounting and folding the middle of the mounting; the single-layer reticulated shell 2 is installed by adopting the installation mode of small-unit modularized assembling, block hoisting and embedding and repairing rod pieces.
It should be noted that: the construction of the main arch truss 1 adopts the modes of ground vertical assembly, sectional hoisting and mounting with two sides mounted and the middle folded, so that the main arch truss 1 can be conveniently and quickly assembled on the ground;
the single-layer latticed shell 2 is assembled in a small-unit modularized mode, is hoisted in a blocking mode and is installed with embedded rod pieces, optimization analysis is carried out according to the performance and structure characteristics of the crane, the south and north regions are symmetrically installed, east and west regions are installed independently, and the assembling process is ordered and rapid.
Referring to fig. 1, a main arch truss 1 is divided into 11 segments, and a single-layer latticed shell 2 is divided into 4 large-area 23 hoisting units; the main arch truss 1 and the single-layer latticed shell 2 are assembled by adopting a 25-ton truck crane; the main arch hoisting 1 adopts a 400-ton crawler crane to hoist 11 units, the hoisting installation mode adopts a construction method of firstly constructing two sides and then constructing in the middle from bottom to top, and finally, the middle section is folded and installed; the single-layer reticulated shell 2 is installed in a block-by-block mode by adopting a 500-ton crawler crane; the embedded rod pieces are installed by adopting 25t, 50t and 130t truck cranes.
It should be noted that: assembling the main arch truss 1 and the single-layer latticed shell 2 by adopting a 25-ton truck crane according to the structural form and the crane performance;
hoisting 11 units by adopting a 400-ton crawler crane to finish the construction and installation of the main arch hoist 1;
the block mounting mode of a 400-ton truck crane is adopted, and 25t, 50t and 130t truck cranes are adopted to mount the embedded rod pieces after the construction and the mounting of the single-layer reticulated shell 2 are completed.
Referring to fig. 1, the block units of the main arch truss 1 and the block units of the single-layer latticed shell 2 are hoisted by adopting sling binding and wire rope hoisting, and different hoisting rigging are selected according to hoisting weight.
It should be noted that: the derricking coefficient value in the binding and hoisting calculation is determined according to the requirements of the technical safety standard of hoisting and hoisting engineering for building construction JGJ276,
binding node position reduction coefficient: z1 ═ 0.9
Formula for calculation
According to 60 hoist and mount angle calculation, adopt the ligature hoist and mount, single hoist cable load size is:
Figure BDA0003648512790000051
wherein:
k1-dynamic load coefficient, value 1.1
K2-load imbalance coefficient, value 1.1
G-weight of reticulated shell, t
B, the number of hoisting belts;
the lifting angle of 60 degrees in the lifting calculation of the lifting lug is calculated, the lifting lug plates are adopted for connection, and the load of a single sling is as follows:
Figure BDA0003648512790000052
wherein:
k1-dynamic load coefficient, value 1.1
K2-load imbalance coefficient, value 1.1
G-weight of reticulated shell, t
B is the number of slings;
the selection of the hoisting snap ring is required to be carried out according to the hoisting load.
Referring to fig. 1, before hoisting and installation, site construction operation conditions are sufficiently analyzed, and a walking route of the crawler crane, a component assembling site, a material yard and an external field transfer site need to be separately processed.
It should be noted that: in order to ensure the safety of hoisting operation, the traveling route of the crawler crane is flat and needs to be compacted for the second time in the field related to the crawler crane, the compaction coefficient is not less than 0.95, after compaction, 400 mm-thick gravel/brick slag is laid and compacted, and the compaction strength needs to be not less than 180 KPa. And if the requirements of the crawler crane for running and station hoisting are not met, paving a roadbed box above the ground. In the using process of the roadbed box, each crawler crane is provided with 20 large roadbed boxes, and the installation process is used in a turnover mode. The crawler crane road foundation box is matched with a 50t truck crane in a turnover way;
in the component assembling area, a compaction and hardening mode is adopted, and a roadbed box is additionally arranged at the position where the crawler crane is in place so as to reduce the pressure and ensure the hoisting safety in the operation process. And standardized hard shaping protection is arranged at the periphery of the assembly site. C25 concrete is required to be hardened in the component assembly field, and the hardening thickness is 200 mm. Curing regularly after hardening, and performing upper assembly operation after the strength reaches 85%;
the material yard adopts the mode of compaction + stone + drainage facility, and the material yard sets up in assembling the place outside, need handle the ground during the use. Firstly, leveling the field by using an excavator. And compacting after finishing leveling, wherein the compacting coefficient is not less than 0.95. After compaction, stones with a thickness of 400mm are laid on the concrete. Standardized hard sizing protection is arranged on the periphery of the component storage yard;
and (4) in an external field transfer site, adopting a mode of compacting, brick slag, stones and sleepers.
Referring to fig. 2 and 3, in the installation of the main arch truss 1 and the single-layer latticed shell 2, a standard knot installation jig frame is arranged in a field, and the installation jig frame uses a 60-tower crane standard knot and a 40-tower crane standard knot as a main bearing unit; the supporting system of the main arch truss 1 and the single-layer latticed shell 2 is calculated by 117 groups, and the concentric back jacking is adopted for temporary supporting and reinforcing in the region of 24 groups of a basement top plate, 4 groups of source-ground second-layer bottom plates, 1 group of source-ground fifth-layer bottom plates, 5 groups of source-ground sixth-layer bottom plates and 3 groups of source-ground roof layer bottom plates.
It should be noted that: the main arch truss 1 and the single-layer latticed shell 2 are fixed at a floor position by a mounting jig frame, a support frame is erected above a concrete floor, the position with insufficient floor bearing capacity is subjected to back jacking treatment, the mounting position of a support base and the position of a concrete beam are lofted on the floor, the position of the concrete beam is paved with a section steel and fixed by using expansion bolts, the support base is erected on section steel and welded with the section steel, a standard section and a top platform are assembled after the mounting is completed, the support frame needs to be erected with lateral supports after the assembly is completed, the conversion base and the lateral supports are fixed by using M16 expansion bolts, when the expansion bolts are constructed, an M20 drill bit is used for drilling, and the drilling depth is controlled strictly according to the specification requirements. A cable rope (phi 14 steel wire rope) is pulled at the top of the support frame for fixing, and a batten is required to be arranged at the connecting position of the steel wire rope and the stiff steel reinforced column to prevent the steel wire rope from sliding;
when a working condition is one, and the corresponding support of the main arch does not fall on the pile foundation, four piles need to be added;
when the working condition II occurs, if the support corresponding to the reticulated shell arch is not on the pile foundation, adding a pile;
when the position of the base of the mounting jig frame is not on the existing pile position, an additional pile needs to be added;
the processing mode of the mounting jig frame without reserved embedded plates is as follows:
the installation jig frame base and the floor slab are fixed by using embedded bars, the end part and the middle position of the long section steel are respectively provided with 4 embedded bar holes, the end part of the short section steel is provided with 4 embedded bar holes, the spacing between the embedded bar holes is 200mm, the embedded bars are constructed according to the standard requirement, and the embedded bars are 16mm in diameter by using the type of the embedded bars;
the arrangement mode of the installation jig frame of the main arch truss 1 is divided according to the construction sequence and the construction method, the main arch is divided into 13 areas, 30 groups of installation jig frames are arranged, a truss supporting platform is erected at the upper part of the installation jig frame and used for connecting and fixing supporting frames, a knife plate upright post is placed at the top of the installation jig frame and used for later-stage unloading, four cable ropes (phi 14) are erected to 2/3 positions of standard joints, the field center positions of the cable ropes are fixed by adopting embedded tie points or anchoring bolts on a concrete structure, the included angle between each cable rope and the ground is not more than 60 degrees, the installation jig frames are connected by adopting section steel welding to assemble a connecting truss to be connected, part of the installation jig frame is connected by 200 x 8 x 12 section steel, and the standard joints are connected by section steel 200 x 8 x 12 and L63 x 5;
the arrangement mode of the latticed shell installation jig frames is divided according to the construction sequence and the construction method, the latticed shell is divided into 23 areas, 87 groups of installation jig frames are arranged, the installation jig frames are fixedly connected through section steel or Bailey frames, a truss supporting platform is arranged on the upper portion of each installation jig frame, a knife board stand column is arranged on the top of each installation jig frame and used for later-stage unloading, four cable ropes (phi 14) are arranged at positions where standard knots are arranged to 2/3, the bottoms of the cable ropes are fixed with ground anchors, the included angle between each cable rope and the ground is not more than 60 degrees, and when the distance between the installation jig frames is not more than 10m, the installation jig frames are connected through section steel welding and assembled into a connecting truss for connection. And the connecting part mounting jig frame is connected with 200X 8X 12 section steel. The standard joint connection adopts section steels 200 × 8 × 12 and L63 × 5;
the basement back-jacking reinforcement measure is that the bottom platform is made of Q355H 300X 10X 15H-shaped steel, the base platform 2 is made of H400X 40013X 21H-shaped steel, the back-jacking measure is made of a phi 299X 10 round pipe of Q355B, the thicknesses of the top plate, the bottom plate and the cross-shaped steel plate are all 20mm, the thickness of the bottom reinforcing rib plate is 10mm, the height of the cross-shaped steel plate is 500mm, and the maximum height of the adjusting end is 350 mm;
the main arch truss 1 and the single-layer reticulated shell 2 are supported and prevented from overturning, namely, an installation jig frame needs to be erected before the main arch truss 1 and the single-layer reticulated shell 2 are installed, two sides of the main arch truss 1 and the single-layer reticulated shell 2 are respectively fixed by arranging two cable ropes, and the cable ropes are fixed by embedding tie points or fixing by drilling anchor bolts on a concrete structure. When the main arch truss and the single-layer latticed shell are assembled in the high altitude, the partial installation jig frame is connected and selected from 200X 8X 12 steel. The standard knot is connected by adopting section steels 200X 8X 12 and L63X 5, is fixed with the net rack in a section welding mode in time after being in place, and is provided with a cable rope in a pulling mode to form a stable system.
And four guy cables (phi 14) are arranged at positions where the standard knots are erected to 2/3, and the field center positions of the guy cables are fixed by adopting pre-buried tie points or anchoring bolts on a concrete structure.
Referring to fig. 1 and 4, a main arch truss 1 and a single-layer latticed shell 2 are assembled in a horizontal assembly mode, section steel is used as an assembly jig frame in assembly, a positioning cutting board is arranged above the main arch truss for rod positioning, steel casting positioning is preferentially carried out, then structural assembly is sequentially completed from top to bottom, and welding operation from top to bottom is carried out after rechecking is completed and errors do not exist.
It should be noted that: the main arch truss 1 unit assembly is ground assembly jig frame arrangement, lower chord member positioning, upper chord member and upright member positioning, lower chord diagonal web member positioning, upper chord top member positioning and upper chord top diagonal web member positioning (assembly is completed);
the single-layer latticed shell 2 unit assembly comprises ground assembly jig frame arrangement, steel casting triangle positioning, connection of triangle steel casting cross rods to form a plane triangle system, steel casting positioning, outward positioning of adjacent steel castings by taking a center triangle as a positioning part, connection of cross rods of outer ring steel castings, positioning of outer ring steel castings and connection of cross rods, connection of cross rods of outer ring steel castings, and installation of internal residual rod pieces (assembly completion);
after the main arch truss 1 and the single-layer latticed shell 2 are subjected to test hoisting, hoisting can be carried out;
the main arch truss 1 and the single-layer latticed shell 2 are mainly fixed by temporary reinforcement, a total station or a plumb is used for measuring whether the verticality of the truss meets the requirement before reinforcement, wind ropes are used on two sides for fine adjustment, spot welding reinforcement is immediately carried out after correction is correct, the length of a spot welding seam is more than or equal to 30mm, the distance is less than or equal to 100mm, and after spot welding fixation, a connected rod piece needs to be bottomed and filled 1/2, and then hooking can be carried out. After the member is unhooked, an operator immediately welds and reinforces the connection top node, performs permanent fixed connection according to the welding seam grade and welding requirements, and immediately checks, welds and strictly prohibits hoisting of the next main arch truss 1 or the latticed shell unit 2 under the condition that all nodes are not welded completely after one unit is installed.
The invention also provides a construction method of the dewatering well construction device, which comprises the following steps:
s1, firstly, selecting hoisting equipment according to parameters of the main arch truss 1 and the single-layer latticed shell 2, and analyzing hoisting conditions;
s2, selecting different hoisting riggings according to hoisting weight, calculating binding and hoisting numerical values, calculating hoisting numerical values of lifting lugs, and selecting hoisting snap rings according to hoisting loads;
s3, fully analyzing the operation conditions of site construction, and individually processing the walking route of the crawler crane, the component assembling site, the material yard and the outfield transfer site;
s4, installing temporary facilities for the main arch truss 1 and the single-layer latticed shell 2, assembling the jig frames of the main arch truss 1 and the single-layer latticed shell 2, arranging the installation jig frames of the main arch truss 1 and the single-layer latticed shell 2, adjusting the position of a platform at the bottom of the jig frame, locating the platform at the positions of a civil engineering beam and a civil engineering column, and performing concentric back-jacking reinforcement on the beam;
s5, after the main arch truss 1 and the single-layer reticulated shell 2 are hoisted in place, a toppling prevention measure is pertinently taken;
s6, sequentially completing structural assembly of the main arch truss 1 and the single-layer latticed shell 2 from top to bottom in a horizontal assembly mode, and performing welding operation from top to bottom after re-checking is completed and no error occurs;
s7, safety check preparation is carried out before hoisting, then a crane drives in hoisting station sites of the main arch truss 1 and the single-layer latticed shell 2, trial hoisting is carried out on the main arch truss 1 and the single-layer latticed shell 2, the main arch truss 1 and the single-layer latticed shell 2 are hoisted, after the main arch truss 1 and the single-layer latticed shell 2 are in place, correction and reinforcement are carried out on the main arch truss 1 and the single-layer latticed shell 2, an embedded rod piece is hoisted to be in place, closure section construction is carried out on the main arch truss 1 and the single-layer latticed shell 2, and the main arch truss 1 and the single-layer latticed shell 2 are welded on site;
and S8, unloading the supporting columns by adopting a cutting board grading cutting unloading mode after all the structures are completed.
The working principle of the large-span building main body supporting steel structure and the construction method provided by the invention is as follows: firstly, selecting hoisting equipment according to parameters of a main arch truss 1 and a single-layer latticed shell 2, analyzing hoisting working conditions, splicing 11 sections of small units on the ground by using 25-ton and 50-ton automobile cranes for a part of the main arch truss 1, hoisting 11 units by using 400-ton crawler belts, constructing step by step from bottom to top by adopting a construction method of firstly constructing two sides and then constructing the middle part in a hoisting installation mode, and finally folding and installing the middle part; the single-layer reticulated shell 2 is installed in a block-by-block mode by adopting a 400-ton crawler crane.
The method comprises the following steps of fully analyzing site construction operation conditions, and carrying out independent treatment on a walking route of the crawler crane, a component assembly site, a material storage yard, an outfield transfer site and the like; carrying out secondary compaction on a field related to the crawler crane, and paving and compacting 400 mm-thick broken stones/brick slag after compaction; c25 concrete is required to be hardened on the periphery of the component assembly site, the hardened thickness is 200mm, regular maintenance is carried out after the hardening, and the assembly operation of the upper part is carried out after the strength reaches 85%; firstly, leveling a material yard by using an excavator, compacting after leveling is finished, and paving stones with the thickness of 400mm above the material yard after compacting is finished; .
Assembling the moulding beds of the main arch truss 1 and the single-layer latticed shell 2, assembling the single-layer latticed shell 2 in a horizontal assembling mode, positioning the rods for assembling the main arch truss 1, and then sequentially completing structural assembling. For the assembly of the single-layer reticulated shell 2, steel casting triangular positioning is needed, and after triangular steel casting cross rods are connected to form a planar triangular system, the structural assembly is sequentially completed. And after the assembly is completed and the recheck is correct, welding operation is carried out from top to bottom. After the welding of the steel structure is finished, the hoisting installation can be started.
Before the integral installation, the supporting position of the installation jig frame is determined through finite element software analysis, the Tekla software is used for carrying out three-dimensional collision analysis to ensure the position of the drop point of the installation jig frame, and the Tekla software is used for carrying out three-dimensional analysis pre-assembly to ensure the precision of the assembly of the latticed shell.
The method comprises the steps of arranging a standard knot installation jig frame in a field, erecting a support frame above a concrete floor, performing back jacking treatment on a position with insufficient floor bearing capacity, lofting out a support base installation position and a concrete beam position on the floor, paving a section steel beam on the concrete beam position and fixing the section steel beam by using expansion bolts, erecting a support base on section steel and welding the section steel beam with the section steel beam, erecting a standard knot and a top platform after the installation is finished, erecting a lateral support after the assembly is finished, fixing a conversion base and the lateral support by using M16 expansion bolts, punching by using an M20 drill bit during the construction of the expansion bolts, and strictly controlling the punching depth according to the specification requirements. And a cable rope (phi 14 steel wire rope) is pulled at the top of the support frame for fixing, and a batten is required to be arranged at the connecting position of the steel wire rope and the stiff steel reinforced column for preventing the steel wire rope from sliding.
When the support corresponding to the main arch does not fall on the pile foundation, additionally installing four piles; when the support corresponding to the reticulated shell arch is not on the pile foundation, additionally installing a pile; when the mounting jig frame is arranged on a pile position, the buried plate is placed on the pile cap before the concrete of the pile cap is poured; when the installation jig frame is arranged at the position of the floor slab, the base of the installation jig frame uses profile steel, and the concrete floor slab at the position of the installation jig frame is reserved with the embedded slab.
The upper part is provided with a truss supporting platform for connecting and fixing the supporting frames, the top is provided with a knife board upright post for later-stage unloading, four cable ropes (phi 14) are arranged at positions 2/3 where standard knots are arranged, and the field center positions of the cable ropes are fixed by adopting pre-buried tie points or by drilling anchor bolts on a concrete structure. And connecting the installation jig frames by adopting a connecting truss assembled by welding profile steels.
According to model laying-out, adjustment bed-jig bottom platform position is located the platform at the position of civil engineering roof beam and civil engineering post, carries out concentric back jacking to the roof beam and consolidates, during the installation, will adjust the end and pass through jack back jacking stiff end with the bottom, and the stiff end steel sheet is closely pasted firmly with the concrete beam back, and the notch welded fastening is reserved with the pipe to cross steel sheet.
An installation jig frame is erected before the installation of the arch truss and the single-layer latticed shell, two sides of the installation jig frame are respectively provided with two cable ropes for fixation, and the cable ropes are embedded with tie points or fixed on a concrete structure by anchoring bolts. When the main arch truss and the single-layer latticed shell are assembled in high altitude, the standard knot is in place and then is welded and fixed with the net rack in sections in time, the cable rope is pulled, the standard knot is erected to 2/3 positions to install four cable ropes (phi 14), and the cable rope field center position is fixed by adopting pre-buried pulling points or anchoring bolts on a concrete structure.
Before hoisting, whether rigging and tools are complete or not is checked, whether the serial numbers of the main arch and the latticed shell correspond to the installation positions or not is checked, whether control lines are complete or not, whether safety facilities are complete or not, whether hoisting channels are smooth or not and whether hoisting equipment is intact or not are checked, the in-position distance and the elevation are checked, and complete marking and accurate positions are achieved; before hoisting, cleaning sundries and surrounding obstacles on two sides of the truss; whether the connection points of the truss and the assembly operation jig frame are still formed or not.
After the crane is driven into the main arch and the reticulated shell lifting station, the lifting points are firmly bound according to the arrangement of the main arch and the reticulated shell lifting points, and the embedded rod pieces are installed in place by adopting a 50t/130t truck crane in time after the main arch truss 1 and the single-layer reticulated shell 2 are in place.
And binding a sliding rope at a hoisting point, pulling a wind rope to ensure hanging, slowly hoisting the crane under the command of a crane worker after ensuring that the main arch, the latticed shell and the operation jig frame are separated, observing the running condition of the crane, and checking whether the stress of the steel wire rope is uniform to carry out preset hoisting trial.
The main arch truss 1 and the single-layer latticed shell 2 are clamped and positioned before being installed. After the hoisting adjustment is completed, temporary fixing is immediately carried out, before reinforcement, a total station or a plumb is used for measuring whether the verticality of the truss meets the requirement, wind ropes on two sides are used for fine adjustment, spot welding reinforcement is immediately carried out after correction is correct, and after spot welding fixation, a connected rod piece needs to be underlaid and filled 1/2, and then the hook can be taken off. After the component is unhooked, an operator immediately welds and reinforces the connection top node, and immediately checks and welds each unit after the installation is finished; hoisting the embedded rod piece in place by using a truck crane, temporarily reinforcing and fixing the embedded rod piece by using a horse plate, and after the fixation is finished, at least padding 1/3 sides are filled, and the embedded rod piece can be picked and hooked; and (3) performing construction welding on the closure section of the main arch truss 1 and the single-layer latticed shell 2.
After the whole structure is completed, firstly unloading the single-layer reticulated shell 2 area supporting frames, firstly unloading the single-layer reticulated shell 2 supporting frames in the left area and the right area, secondly unloading the single-layer reticulated shell 2 top area supporting frames on the upper side and the lower side, thirdly unloading the rest single-layer reticulated shell 2 supporting frames, and finally unloading the main arch truss 1 area, wherein the unloading of the supporting frames on the main arch truss 1 is completed in three steps. All the support frame unloading modes adopt a mode of cutting and unloading by stages by a cutting board.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (8)

1. The utility model provides a large-span building main part supports steel construction which characterized in that includes:
the main truss (1) that encircles, the span of main truss (1) that encircles is 150 ~ 160 meters, erection joint has individual layer net shell (2) on the main truss (1) that encircles, the span of individual layer net shell (2) is 190 ~ 200 meters, install individual layer net shell (2) after main truss (1) installation finishes, the welding of main truss (1) built-in member is through the welding of main interior packway facility that encircles truss (1) and carry out the welding of built-in member.
2. The large-span building main body supporting steel structure as claimed in claim 1, wherein the main arch truss (1) is installed by adopting a mode of vertical assembly on the ground, sectional hoisting and middle folding of two sides of the embedded installation; the single-layer latticed shell (2) is installed in a small-unit modularized assembling mode, a block hoisting mode and an embedding and supplementing rod piece installing mode.
3. The large-span building main body supporting steel structure as claimed in claim 1, wherein the main arch truss (1) is divided into 11 sections, and the single-layer latticed shell (2) is divided into 4 large-area 23 hoisting units; the main arch truss (1) and the single-layer latticed shell (2) are assembled by adopting a 25-ton truck crane; the main arch hoisting (1) adopts a 400-ton crawler crane to hoist 11 units, the hoisting installation mode adopts a construction method of firstly constructing two sides and then constructing in the middle from bottom to top, and finally, the middle section is folded and installed; the single-layer reticulated shell (2) is installed in a block-by-block mode by adopting a crawler crane of 500 tons; the embedded rod pieces are installed by adopting 25t, 50t and 130t truck cranes.
4. The large-span building main body supporting steel structure as claimed in claim 3, wherein the block units of the main arch truss (1) and the single-layer latticed shell (2) are hoisted by means of sling binding and wire rope hoisting, and different hoisting rigging are selected according to hoisting weight.
5. The large-span building main body supporting steel structure as claimed in claim 3, wherein before hoisting and installation, on-site construction operation conditions are sufficiently analyzed, and a crawler crane walking route, a component assembling site, a material yard and an outfield transfer site need to be individually processed.
6. The large-span building main body supporting steel structure is characterized in that the main arch truss (1) and the single-layer latticed shell (2) are installed, a standard knot installation jig frame is arranged in a field, and the installation jig frame uses a 60-tower crane standard knot and a 40-tower crane standard knot as a main bearing unit; the supporting system of the main arch truss (1) and the single-layer latticed shell (2) is calculated to be 117 groups, the groups are respectively arranged on a basement top plate 24 group, a source-ground second-layer bottom plate 4 group, a source-ground fifth-layer bottom plate 1 group, a source-ground sixth-layer bottom plate 5 group and a source-ground roof layer bottom plate 3 group, concentric top returning is adopted for temporary supporting and reinforcing in the area, the position of a platform at the bottom of a jig frame is adjusted according to model lofting, the platform is located at the positions of a civil engineering beam and a civil engineering column, and concentric top returning reinforcement is carried out on the beam.
7. The large-span building main body supporting steel structure as claimed in claim 3, wherein the main arch truss (1) and the single-layer latticed shell (2) are assembled in a horizontal assembly mode, section steel is used as an assembly jig frame in the assembly mode, a positioning knife plate is arranged above the main arch truss and used for positioning rod pieces, steel casting positioning is preferentially carried out, then structural assembly is sequentially completed from top to bottom, and welding operation is carried out from top to bottom after recheck is completed.
8. A construction method of a large-span building main body supporting steel structure is characterized by comprising the following steps:
s1, firstly, selecting hoisting equipment according to parameters of the main arch truss (1) and the single-layer latticed shell (2), and analyzing hoisting working conditions;
s2, selecting different hoisting riggings according to hoisting weight, calculating binding and hoisting numerical values, calculating hoisting numerical values of lifting lugs, and selecting hoisting snap rings according to hoisting loads;
s3, fully analyzing the operation conditions of site construction, and individually processing the walking route of the crawler crane, the component assembling site, the material yard and the outfield transfer site;
s4, installing temporary facilities for the main arch truss (1) and the single-layer latticed shell (2), assembling the jig frames of the main arch truss (1) and the single-layer latticed shell (2), arranging the installation jig frames of the main arch truss (1) and the single-layer latticed shell (2), adjusting the position of a platform at the bottom of the jig frame, locating the platform at the positions of a civil engineering beam and a civil engineering column as much as possible, and if the platform cannot be located at the position of a concrete column, concentrically jacking and reinforcing the beam slab;
s5, after the main arch truss (1) and the single-layer latticed shell (2) are hoisted in place, a toppling prevention measure is pertinently taken;
s6, sequentially completing structural assembly of the main arch truss (1) and the single-layer latticed shell (2) from top to bottom in a horizontal assembly mode, and performing welding operation from top to bottom after recheck is completed;
s7, safety check preparation is carried out before hoisting, then a crane is driven into hoisting station sites of the main arch truss (1) and the single-layer latticed shell (2), trial hoisting is carried out on the main arch truss (1) and the single-layer latticed shell (2), the main arch truss (1) and the single-layer latticed shell (2) are hoisted, after the main arch truss (1) and the single-layer latticed shell (2) are in place, correction and reinforcement are carried out on the main arch truss (1) and the single-layer latticed shell, hoisting embedded rod pieces are in place, closure section construction is carried out on the main arch truss (1) and the single-layer latticed shell (2), and the main arch truss (1) and the single-layer latticed shell (2) are welded on site;
and S8, unloading the supporting columns in a cutting board grading cutting unloading mode after all the structures are completed.
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