CN111827483A - Construction method for roof curved surface # -shaped combined steel truss girder - Google Patents
Construction method for roof curved surface # -shaped combined steel truss girder Download PDFInfo
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- CN111827483A CN111827483A CN202010829591.9A CN202010829591A CN111827483A CN 111827483 A CN111827483 A CN 111827483A CN 202010829591 A CN202010829591 A CN 202010829591A CN 111827483 A CN111827483 A CN 111827483A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 42
- 239000010959 steel Substances 0.000 title claims abstract description 42
- 238000010276 construction Methods 0.000 title claims abstract description 30
- 238000003466 welding Methods 0.000 claims abstract description 43
- 238000009434 installation Methods 0.000 claims abstract description 26
- 241001669679 Eleotris Species 0.000 claims description 10
- 230000005484 gravity Effects 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 238000004804 winding Methods 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/342—Structures covering a large free area, whether open-sided or not, e.g. hangars, halls
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/04—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack
- B66C13/08—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack for depositing loads in desired attitudes or positions
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
- E02D5/80—Ground anchors
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
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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
- E04G21/14—Conveying or assembling building elements
- E04G21/142—Means in or on the elements for connecting same to handling apparatus
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
- E04C2003/0486—Truss like structures composed of separate truss elements
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- Conveying And Assembling Of Building Elements In Situ (AREA)
Abstract
The invention discloses a construction method for a curved-surface # -shaped combined steel truss beam of a roof, which comprises the following steps: a. assembling at least two sections of main truss bodies in a field mode, and welding the main truss bodies into a curved main truss; b. arranging a frame column; c. hanging and fixing the curved main truss on the frame column; d. setting a balance measure for the curved main truss; e. connecting and fixing the longitudinal secondary truss and the curved main truss; f. setting a balance measure for the longitudinal secondary truss; g. connecting and fixing the transverse secondary truss and the longitudinal secondary truss; h. and (4) pulling horizontal supports among the curved main truss, the longitudinal sub-truss and the transverse sub-truss, and then removing the guy cable and the guy cable ground anchor. The invention can control the stability outside the field assembly installation surface of the single-truss large-span truss, and ensures the installation quality and the construction safety of the curved plane truss by adopting a proper installation tool and a reasonable construction method.
Description
Technical Field
The invention belongs to the technical field of truss girder construction, and particularly relates to a construction method for a curved surface # -shaped combined steel truss girder of a roof.
Background
In order to improve the utilization rate of industrial plants, the arrangement of internal structural columns of the plants needs to be reduced, the arrangement of related production equipment and process pipelines is convenient, and in order to achieve the purpose, high-performance green steel is mostly adopted as a roof structure of the building, so that the large-span function is realized. The orthogonal plane truss structure is one of the structures with good bearing capacity, and meanwhile, the structure is simple, convenient for manufacturing, processing and transportation in a factory, and also beneficial to on-site assembly and installation, and is an engineering product with great popularization value.
The prior art 2019.08.19 discloses an invention patent named as an assembly jig frame of a space special-shaped steel pipe truss and an assembly and installation method (application number: CN201910765855.6), which is characterized in that in the process of lifting and placing, after ground assembly is completed, the center of gravity is inquired according to a three-dimensional model, an appropriate lifting point is selected by combining an installation angle indicated by a drawing, and a lifting lug hooped on a main pipe is installed at the position of the lifting point; and hoisting the truss, adjusting the in-place angle in the air, and slowly hoisting the truss in place to complete the installation of the special-shaped steel pipe truss structure.
However, in the installation process of the on-site curved planar truss, the out-of-site assembly and installation surface stability control of the single-truss large-span truss is very critical, and if the control is improper, the planar truss is prone to overturning, so that the construction difficulty is increased, the construction period is prolonged, and meanwhile potential safety hazards are caused.
Disclosure of Invention
The invention aims to solve the defects in the prior art, provides a construction method for a curved-surface # -shaped combined steel truss girder of a roof, can control the stability of a single-truss large-span truss outside the field assembly installation surface, and ensures the installation quality and the construction safety of a curved-surface plane truss by adopting a proper installation tool and a reasonable construction method.
In order to solve the technical problems, the invention adopts the following technical scheme:
the construction method for the curved-surface # -shaped combined steel truss girder of the roof is characterized by comprising the following steps of:
a. assembling at least two sections of main truss bodies in a field mode, and welding the main truss bodies into a curved main truss;
b. according to the shape of the curve-shaped main truss, arranging a plurality of sections of frame columns with different heights on the ground, wherein the heights of the frame columns are designed according to the bottom capable of supporting the curve-shaped main truss;
c. hanging and fixing the curved main truss on the frame column;
d. and (3) setting a balance measure for the curved main truss:
(1) installing a cable wind rope ground anchor on the ground according to the installation position of each section of curved main truss;
(2) fixing a guy cable between the guy cable ground anchor and the curved main truss;
e. connecting and fixing the longitudinal secondary truss and the curved main truss:
(1) hoisting the longitudinal sub-truss on the curved main truss by using a hoisting machine, and temporarily fixing the longitudinal sub-truss and the curved main truss;
(2) welding and fixing the longitudinal secondary truss and the curved main truss;
f. and (3) setting balance measures for the longitudinal sub-truss:
(1) installing a cable wind rope ground anchor on the ground according to the installation position of each section of longitudinal secondary truss;
(2) fixing a guy rope between the guy rope ground anchor and the longitudinal secondary truss;
g. connecting and fixing the transverse secondary truss and the longitudinal secondary truss:
(1) hoisting the transverse secondary truss on the longitudinal secondary truss by adopting a hoisting machine, and temporarily fixing the transverse secondary truss and the longitudinal secondary truss;
(2) welding and fixing the transverse sub-truss and the longitudinal sub-truss;
h. and (4) pulling horizontal supports among the curved main truss, the longitudinal sub-truss and the transverse sub-truss, and then removing the guy cable and the guy cable ground anchor.
Further, in the step a, the main truss main bodies are supported on the ground by adopting a temporary assembling device, the supporting nodes of the temporary assembling device on the main truss main bodies are determined by adjusting the height of the temporary assembling device, each main truss main body is correspondingly provided with at least two temporary assembling devices, then a triangular support is arranged on the ground, the triangular support supports the outer ends of the main truss main bodies at the outermost side, and then two adjacent main truss main bodies are welded into the curve-shaped main truss.
The main truss main bodies are bent in shape, and can not be aligned and welded if being placed on the ground of a construction site for welding, so that the temporary assembling device is adopted to support the main truss main bodies, and each section of the main truss main bodies can be aligned and assembled on the site and welded into a curved main truss through self height adjustment of the temporary assembling device, and the welding quality is improved. Because the main truss main body is long, two temporary assembling devices are generally adopted, and the number of the temporary assembling devices can be properly increased according to the length of the main truss main body. In order to improve the welding integrity, the triangular supports are arranged on the ground and support the outer ends of the main truss bodies at the outermost sides, so that the welding stability is improved, and the integral position of the curved main truss obtained by welding is controlled.
Further, the adopted temporary assembling device comprises a cross rod, a supporting vertical rod, H-shaped steel and a truss bracket, wherein the supporting vertical rod is vertically welded on the cross rod, the H-shaped steel is provided with a connecting bolt, the supporting vertical rod is vertically and uniformly provided with at least four limiting holes, the connecting bolt penetrates through the limiting holes, the H-shaped steel is provided with an adjusting screw rod, the truss bracket is arranged on the adjusting screw rod, the adjusting screw rod is provided with an adjusting nut, and the adjusting nut supports the truss bracket;
the operation of supporting the main truss body on the ground by adopting the temporary assembling device is as follows:
(1) aiming at the position of each section of main truss body, a temporary pairing device is installed on the ground;
(2) aiming at the shape of a curve-shaped main truss, determining the position of a first section of main truss body, taking the main truss body closest to the ground as a first section, placing a sleeper on the ground, arranging the first section of main truss body on the sleeper in a cushioning manner, simultaneously supporting the main truss body by constructors, then performing height adjustment on a temporary assembling device corresponding to the first section of main truss body, specifically, vertically moving H-shaped steel on a supporting upright rod, arranging a connecting bolt on the H-shaped steel when the distance between a supporting point at the top of a truss bracket and the lowest point of an upper chord of the main truss body is within the adjusting range of an adjusting screw rod, introducing the connecting bolt into a limiting hole of the supporting upright rod, then moving the truss bracket upwards on the adjusting screw rod, attaching the truss bracket to the upper chord of the main truss body, and screwing an adjusting nut on the adjusting screw rod, and supporting the adjusting nut on the bottom surface of the truss bracket;
(3) aiming at the position of the first section of main truss main body, taking the main truss main body adjacent to the first section of main truss main body as a second section of main truss main body, lifting the second section of main truss main body, and when the welding positions of the second section of main truss main body and the first section of main truss main body are aligned with each other, performing height adjustment on a temporary assembling device corresponding to the second section of main truss main body, wherein the adjustment mode is the same as the height adjustment of the temporary assembling device corresponding to the first section of main truss main body;
(4) and lifting the rest main truss main bodies to be supported according to the position of the main truss main body after being supported, and when the welding positions of the main truss main body to be supported and the main truss main body after being supported are aligned with each other, performing height adjustment on the temporary assembling device corresponding to the main truss main body to be supported, wherein the adjustment mode is the same as the height adjustment of the temporary assembling device corresponding to the main truss main body at the first section.
In order to enable the curved main truss obtained by integral welding to be a certain distance away from the ground, the main truss body closest to the ground is taken as the first section, the setting height of the whole curved main truss can be controlled by only controlling the setting height of the main truss body closest to the ground, therefore, sleepers are placed on the ground, then the main truss body of the first section is padded on the sleepers, the setting height of the whole curved main truss is controlled by controlling the height of the sleepers, the contact between the curved main truss and the ground is avoided, and meanwhile, the volume of the sleepers is reduced as much as possible. In addition, the height adjustment of the temporary assembly device is divided into two times of adjustment, the height of the truss bracket is preliminarily adjusted through the vertical movement of the H-shaped steel on the supporting upright rod for the first time, and the adjustment distance is larger; adjusting nut on the adjusting screw is twisted for the second time, and the height of truss bracket is adjusted accurately, so that the truss bracket can support the positions with different heights on the curve-shaped main truss, the main bodies of the multi-section main truss can be aligned with each other to be welded, the shape of the curve-shaped main truss is adapted, and the welding stability is improved.
Further, install first bracing between horizontal pole and the support pole setting, improve the bearing capacity who supports the pole setting.
Furthermore, install the second bracing between H shaped steel and the support pole setting, improve H shaped steel's bearing capacity.
Further, step c specifically includes:
(1) and arranging a second connecting node on each section of the curve-shaped main truss according to the gravity center of the curve-shaped main truss, arranging a first connecting node on the shoulder pole beam, winding a balance sling between the first connecting node and the second connecting node, and fixing two ends of the balance sling on the curve-shaped main truss.
(2) And fixing a hoisting cable between the hoisting machine and the shoulder pole beam, starting the hoisting machine, hoisting the curved main truss section by section onto the frame column, and fixing the curved main truss on the frame column.
Generally, the number of the hoisting machinery and the number of the shoulder pole beams are set according to the length of each section of the curved main truss, and the invention adopts two hoisting machinery to hoist and place each section of the curved main truss. Because the shoulder pole beam is of a rigid structure, and the curved main truss is also of a rigid structure, the balance sling is arranged between the shoulder pole beam and the curved main truss in a balanced and tight manner, and the hanging stability of each section of the curved main truss is improved.
Furthermore, a support is arranged at the top of the frame column, the curved main truss is hung on the support of the frame column section by section and is welded and fixed with the support of the frame column, the support can be inserted into the curved main truss, the curved main truss is quickly welded and fixed with the support, and the fixed connection of the curved main truss and the frame column is realized.
Furthermore, the first connecting node adopts a first fixed pulley, and the second connecting node adopts a second fixed pulley, so that the balance sling has rolling friction on the shoulder pole beam and the curved main truss, and the balance sling is conveniently tensioned on the shoulder pole beam and the curved main truss. Two first fixed pulleys are arranged on a single carrying pole beam, a second fixed pulley is arranged on a curved main truss, the central position between the two first fixed pulleys corresponds to one second fixed pulley, a balance sling is wound at the upper end of the first fixed pulley, the balance sling is wound at the lower end of the second fixed pulley, then two ends of the balance sling are fixed on the curved main truss, the carrying pole beam corresponds to the two first fixed pulleys and the second fixed pulley, the balance sling is wound in a triangular sectional shape, the acting force is uniformly applied to the curved main truss by the carrying pole beam according to the gravity center of the curved main truss, the stability of the curved main truss is improved, the number of hoisting machinery and carrying pole beams is set according to the length of each section of the curved main truss, the invention adopts two hoisting machinery and two sections of the carrying pole beams to hoist each section of the curved main truss, the lifting device is suitable for lifting and placing a curved main truss with a certain length.
Further, the mode of temporarily fixing the longitudinal sub-truss and the curved-shaped main truss is the same as the mode of temporarily fixing the transverse sub-truss and the longitudinal sub-truss, and specifically comprises the following steps:
(1) and when the transverse secondary truss is hoisted on the longitudinal secondary truss, the transverse secondary truss is used as a hoisting unit, and the longitudinal secondary truss is used as a fixing unit.
(2) Weld the link plate on hanging putting the unit, the bottom of link plate sets up the welding hole, weld two otic placodes simultaneously on fixed unit, put the in-process hanging, the link plate card that will hang on putting the unit is gone into between two otic placodes on the fixed unit, interference fit between link plate and two otic placodes, cross the welding hole this moment and correspond the one side that sets up the welding node between hanging unit and the fixed unit, set up fixing bolt again between two otic placodes and link plate, then through crossing the welding hole with fixed unit and hang and put unit local welded fastening, will fix the unit again and hang and put unit remaining part welded fastening.
When the fixing unit and the hanging unit are welded, the hanging plate on the hanging unit can be clamped between the two ear plates on the fixing unit, so that the hanging unit is temporarily fixed on the fixing unit, acting force is not required to be applied to the hanging unit manually, and the fixing unit and the hanging unit are conveniently and quickly welded and fixed.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
according to the invention, the guy cable is fixed between the guy cable ground anchor and the curved main truss, the outer stability of the assembly and installation surface of the curved main truss can be increased by fixing the guy cable and the guy cable ground anchor, the phenomenon that the curved main truss topples when the longitudinal sub-truss is installed on the curved main truss in the later period is prevented, and the safety of connection and fixation of the longitudinal sub-truss and the curved main truss in the later period is improved.
The guy rope is fixed between the guy rope ground anchor and the longitudinal secondary truss, the outer stability of the assembling and mounting surface of the longitudinal secondary truss can be increased through the guy rope and the guy rope ground anchor, the longitudinal secondary truss is prevented from overturning when the transverse secondary truss is mounted on the longitudinal secondary truss in the later period, and the connection and fixation safety of the transverse secondary truss and the longitudinal secondary truss in the later period is improved.
The invention can control the stability outside the field assembly installation surface of the single-truss large-span truss, and ensures the installation quality and the construction safety of the curved plane truss by adopting a proper installation tool and a reasonable construction method.
Drawings
The invention will be further described with reference to the accompanying drawings in which:
FIG. 1 is a schematic structural view of the curved main truss of the present invention in a sectional configuration;
FIG. 2 is a schematic structural view of the present invention after balancing the longitudinal sub-trusses;
FIG. 3 is a schematic structural view illustrating temporary fixing of the longitudinal sub-trusses and the curved main trusses according to the present invention;
FIG. 4 is a schematic view of the present invention after construction;
FIG. 5 is an enlarged view of the structure at A in FIG. 3;
FIG. 6 is a schematic view of the main truss body supported on the ground by the temporary assembly device according to the present invention;
FIG. 7 is a schematic structural diagram of a temporary assembling apparatus according to the present invention;
FIG. 8 is a schematic view of the structure of FIG. 7 in the direction B;
fig. 9 is a top view of fig. 8.
In the figure, 1-curved main truss; 2-frame columns; 3-a balancing sling; 4-carrying pole beam; 5-fixing a hoisting cable; 6-hoisting machinery; 7-a first fixed pulley; 8-a second fixed pulley; 9-longitudinal sub-trusses; 10-guy rope; 11-ear plate; 12-hanging the board; 13-fixing the bolt; 14-via welding hole; 15-transverse sub-trusses; 16-horizontal support; 17-a main truss body; 18-a triangular support; 19-crosstie; 20-temporary pairing device; 21-supporting upright rods; 22-a cross-bar; 23-H section steel; 24-truss brackets; 25-adjusting the screw; 26-an adjusting nut; 27-a second diagonal brace; 28-a first diagonal brace; 29-a limiting hole; 30-connecting bolts.
Detailed Description
As shown in fig. 1 to 9, the construction method for constructing the curved-surface # -shaped composite steel truss girder for the roof of the invention comprises the following steps:
a. and (3) assembling at least two sections of main truss bodies 17 in field and welding to form the curved main truss 1.
The main truss main bodies 17 are supported on the ground by using the temporary pairing device 20, the supporting nodes of the temporary pairing device 20 on the main truss main bodies 17 are determined by adjusting the height of the temporary pairing device 20, and at least two temporary pairing devices 20 are correspondingly arranged on each main truss main body 17. And arranging a triangular support 18 on the ground, wherein the triangular support 18 supports the outer end of the main truss main body 17 at the outermost side, and then welding two adjacent sections of the main truss main bodies 17 into the curved main truss 1.
Because the main truss main bodies 17 are bent in shape, if the main truss main bodies 17 are directly placed on the ground of a construction site for welding, the main truss main bodies 17 cannot be aligned and welded, the temporary assembling device 20 is adopted to support the main truss main bodies 17, and the height of the temporary assembling device 20 is adjusted, so that the main truss main bodies 17 at each section can be aligned with each other and aligned and assembled on the site, and are welded into the curved main truss 1, and the welding quality is improved. Because the main truss body 17 is long, two temporary assembly devices 20 are generally adopted, and the number of the temporary assembly devices 20 can be increased properly according to the length of the main truss body 17. In order to improve the welding integrity, the triangular supports 18 are arranged on the ground, the triangular supports 18 support the outer ends of the main truss bodies 17 at the outermost sides, the welding stability is improved, and the integral position of the curved main truss 1 obtained by welding is controlled.
The interim group of adoption is to device 20 including horizontal pole 22, support pole setting 21, H shaped steel 23 and truss bracket 24, support the vertical welding of pole setting 21 on horizontal pole 22, H shaped steel 23 is equipped with connecting bolt, support the vertical at least four spacing holes 29 of evenly having seted up of pole setting 21, connecting bolt wears to establish in spacing hole 29, H shaped steel 23 is equipped with adjusting screw 25, on adjusting screw 25 was located to truss bracket 24, adjusting screw 25 was equipped with adjusting nut 26, adjusting nut 26 supports truss bracket 24.
The operation of supporting the main truss body 17 on the ground by using the temporary assembling device 20 is as follows:
(1) a temporary group pairing device 20 is installed on the ground for each section of main truss body 17 position.
(2) Aiming at the shape of a curve-shaped main truss 1, determining the position of a first section of main truss main body 17, taking the main truss main body 17 closest to the ground as a first section, placing a sleeper 19 on the ground, then laying the first section of main truss main body 17 on the sleeper 19, simultaneously supporting the main truss main body 17 by constructors, then carrying out height adjustment on a temporary assembling device 20 corresponding to the first section of main truss main body 17, specifically, vertically moving an H-shaped steel 23 on a supporting upright rod 21, when the distance between a supporting point at the top of a truss bracket 24 and the lowest point of an upper chord of the main truss main body 17 is within the adjusting range of an adjusting screw rod 25, arranging a connecting bolt 30 on the H-shaped steel 23, introducing the connecting bolt 30 into a limiting hole 29 of the supporting upright rod 21, then moving the truss bracket 24 upwards on the adjusting screw rod 25, and attaching the truss bracket 24 to the upper chord of the main truss main body 17, the adjusting nut 26 of the adjusting screw 25 is screwed and the adjusting nut 26 is supported on the bottom surface of the truss bracket 24.
(3) According to the position of the first section of main truss main body 17, the main truss main body 17 adjacent to the first section of main truss main body 17 is used as a second section of main truss main body 17, then the second section of main truss main body 17 is lifted, when the welding positions of the second section of main truss main body 17 and the first section of main truss main body 17 are aligned with each other, the height of the temporary assembly device 20 corresponding to the second section of main truss main body 17 is adjusted, and the adjustment mode is the same as that of the temporary assembly device 20 corresponding to the first section of main truss main body 17.
(4) And lifting the rest main truss main bodies 17 to be supported according to the positions of the main truss main bodies 17 after being supported, and when the welding positions of the main truss main bodies 17 to be supported and the main truss main bodies 17 after being supported are aligned with each other, performing height adjustment on the temporary assembling devices 20 corresponding to the main truss main bodies 17 to be supported, wherein the adjustment mode is the same as the height adjustment of the temporary assembling devices 20 corresponding to the main truss main bodies 17 at the first section.
In order to enable the curved main truss 1 obtained by integral welding to be a certain distance away from the ground, the main truss body 17 closest to the ground is taken as a first section, the setting height of the whole curved main truss 1 can be controlled by only controlling the setting height of the main truss body 17 closest to the ground, therefore, a sleeper 19 is placed on the ground, then the main truss body 17 of the first section is laid on the sleeper 19, the setting height of the whole curved main truss 1 is controlled by controlling the height of the sleeper 19, the contact between the curved main truss 1 and the ground is avoided, and the volume of the sleeper 19 is reduced as much as possible. In addition, the height adjustment of the temporary assembly device 20 is divided into two times of adjustment, the height of the truss bracket 24 is preliminarily adjusted through the vertical movement of the H-shaped steel 23 on the supporting upright rod 21 for the first time, and the adjustment distance is large; adjusting nut 26 on adjusting screw 25 is twisted for the second time, and the height of truss bracket 24 is adjusted accurately for truss bracket 24 can support the position of co-altitude not on curvilinear figure main truss 1, guarantees that multistage main truss main part 17 can aim at each other and weld, adapts to curvilinear figure main truss 1's shape, improves welded stability.
A first inclined strut 28 is arranged between the cross rod 22 and the supporting upright 21, so that the bearing capacity of the supporting upright 21 is improved. And a second inclined strut 27 is arranged between the H-shaped steel 23 and the supporting upright rod 21, so that the bearing capacity of the H-shaped steel 23 is improved.
b. According to the shape of the curve-shaped main truss 1, a plurality of sections of frame columns 2 with different heights are arranged on the ground, and the heights of the frame columns 2 are designed according to the bottoms capable of supporting the curve-shaped main truss 1, so that the curve-shaped main truss 1 can be completely seated on the frame columns 2, and the installation stability of the curve-shaped main truss 1 is improved.
c. The curved main truss 1 is hung and fixed on the frame column 2:
(1) according to the gravity center of the curved main truss 1, a second connecting node is arranged on each section of the curved main truss 1, meanwhile, a first connecting node is arranged on the shoulder pole beam, a balance sling 3 is wound between the first connecting node and the second connecting node, and then two ends of the balance sling 3 are fixed on the curved main truss 1.
(2) A hoisting cable 5 is fixed between the hoisting machine 6 and the shoulder pole beam 4, and the hoisting machine 6 is a crane. And starting the hoisting machinery 6, hoisting the curved main truss 1 section by section onto the frame column 2, and fixing the curved main truss 1 on the frame column 2. The top of the frame column 2 is provided with a support, the curved main truss 1 is hung on the support of the frame column 2 section by section, the supports of the curved main truss 1 and the frame column 2 are welded and fixed, the support can be inserted into the curved main truss 1, the curved main truss 1 and the support are quickly welded and fixed, and the curved main truss 1 and the frame column 2 are fixedly connected.
Generally, the number of the hoisting machinery 6 and the carrying pole beam 4 is set according to the length of each section of the curved main truss 1, and the invention adopts two hoisting machinery 6 to hoist each section of the curved main truss 1. Because the carrying pole beam 4 is a rigid structure, and the curved main truss 1 is also a rigid structure, the balance sling 3 is arranged between the carrying pole beam 4 and the curved main truss 1 in a balanced and tight manner, and the hanging stability of each section of the curved main truss 1 is improved.
The first connecting node adopts the first fixed pulley 7, and the second connecting node adopts the second fixed pulley 8, so that the balance sling 3 is in rolling friction on the carrying pole beam 4 and the curved main truss 1, and the balance sling 3 is conveniently tensioned on the carrying pole beam 4 and the curved main truss 1. Two first fixed pulleys 7 are arranged on a single carrying pole beam 4, a second fixed pulley 8 is arranged on the curved main truss 1, the central position between the two first fixed pulleys 7 corresponds to one second fixed pulley 8, then the balance sling 3 is wound at the upper end of the first fixed pulley 7, the balance sling 3 is wound at the lower end of the second fixed pulley 8, then the two ends of the balance sling 3 are fixed on the curved main truss 1, so that the carrying pole beam 4 corresponds to the two first fixed pulleys 7 and the second fixed pulley 8, the balance sling 3 is wound in a triangular section, the uniform acting force is uniformly applied to the curved main truss 1 by the carrying pole beam 4 according to the gravity center of the curved main truss 1, the stability of the curved main truss 1 during hanging is improved, the number of the hoisting machinery 6 and the carrying pole beams 4 is set according to the length of each section of the curved main truss 1, the invention adopts two hoisting machines 6 and two sections of shoulder pole beams 4 to hoist each section of curved main truss 1, and is suitable for hoisting the curved main truss 1 with a certain length.
d. And (3) setting a balance measure for the curved main truss 1:
(1) and installing a cable anchor on the ground according to the installation position of each section of the curved main truss 1.
(2) The hawser 10 is fixed between the hawser ground anchor and the curved main truss 1.
The outer stability of the assembling installation surface of the curved main truss 1 can be increased by fixing the guy cable 10 and the guy cable ground anchor, so that the curved main truss 1 is prevented from overturning when the longitudinal secondary truss is installed on the curved main truss 1 in the later period, and the safety of connection and fixation of the longitudinal secondary truss and the curved main truss 1 in the later period is improved.
e. Connecting and fixing the longitudinal secondary truss 9 and the curved main truss 1:
(1) and hoisting the longitudinal sub-trusses 9 to the curved main truss 1 by using the hoisting machinery 6, and temporarily fixing the longitudinal sub-trusses 9 and the curved main truss 1.
(2) And welding and fixing the longitudinal sub-trusses 9 and the curved main trusses 1.
Due to the fact that the longitudinal sub-trusses 9 and the curved-shaped main trusses 1 are temporarily fixed, the longitudinal sub-trusses 9 and the curved-shaped main trusses 1 can be welded fast and accurately.
f. The longitudinal sub-trusses 9 are provided with balancing measures:
(1) and installing a cable rope ground anchor on the ground according to the installation position of each section of the longitudinal sub-truss 9.
(2) A hawser 10 is fixed between the hawser ground anchor and the longitudinal sub-truss 9.
g. Connecting and fixing the transverse sub-truss 15 and the longitudinal sub-truss 9:
(1) the transverse sub-truss 15 is hoisted onto the longitudinal sub-truss 9 using the hoisting machine 6, and the transverse sub-truss 15 and the longitudinal sub-truss 9 are temporarily fixed.
(2) The transverse sub-girders 15 and the longitudinal sub-girders 9 are welded and fixed.
h. And a horizontal support 16 is pulled among the curved main truss 1, the longitudinal sub-truss 9 and the transverse sub-truss 15, and then the guy cable 10 and the guy cable ground anchor are removed to form a stable stress unit, and meanwhile, the guy cable 10 and the guy cable ground anchor can be recycled.
The invention can control the stability outside the field assembly installation surface of the single-truss large-span truss, and ensures the installation quality and the construction safety of the curved plane truss by adopting a proper installation tool and a reasonable construction method.
The temporary fixing mode of the longitudinal sub-truss 9 and the curved main truss 1 is the same as the temporary fixing mode of the transverse sub-truss 15 and the longitudinal sub-truss 9, and specifically comprises the following steps:
(1) when the longitudinal sub-trusses 9 are hoisted to the curved-shaped main truss 1, the longitudinal sub-trusses 9 are used as hoisting units, the curved-shaped main truss 1 is used as a fixing unit, when the transverse sub-trusses 15 are hoisted to the longitudinal sub-trusses 9, the transverse sub-trusses 15 are used as hoisting units, and the longitudinal sub-trusses 9 are used as fixing units.
(2) The hanging plate 12 is welded on the hanging unit, the welding hole 14 is formed in the bottom of the hanging plate 12, two lug plates 11 are welded on the fixing unit, the hanging plate 12 on the hanging unit is clamped between the two lug plates 11 on the fixing unit in the hanging process, the hanging plate 12 and the two lug plates 11 are in interference fit, the welding hole 14 is arranged on one side of a welding node between the hanging unit and the fixing unit correspondingly, the fixing bolt 13 is arranged between the two lug plates 11 and the hanging plate 12, the fixing unit and the hanging unit are welded and fixed locally through the welding hole 14, and then the fixing unit and the rest part of the hanging unit are welded and fixed.
When the fixing unit and the hanging unit are welded, the hanging plate 12 on the hanging unit can be clamped between the two ear plates 11 on the fixing unit, so that the hanging unit is temporarily fixed on the fixing unit, the acting force on the hanging unit does not need to be applied manually, and the fixing unit and the hanging unit are conveniently and quickly welded and fixed.
The above is only a specific embodiment of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions or modifications made based on the present invention to solve the same technical problems and achieve the same technical effects are within the scope of the present invention.
Claims (9)
1. The construction method for the curved-surface # -shaped combined steel truss girder of the roof is characterized by comprising the following steps of:
a. assembling at least two sections of main truss bodies in a field mode, and welding the main truss bodies into a curved main truss;
b. according to the shape of the curve-shaped main truss, arranging a plurality of sections of frame columns with different heights on the ground, wherein the heights of the frame columns are designed according to the bottom capable of supporting the curve-shaped main truss;
c. hanging and fixing the curved main truss on the frame column;
d. and (3) setting a balance measure for the curved main truss:
(1) installing a cable wind rope ground anchor on the ground according to the installation position of each section of curved main truss;
(2) fixing a guy cable between the guy cable ground anchor and the curved main truss;
e. connecting and fixing the longitudinal secondary truss and the curved main truss:
(1) hoisting the longitudinal sub-truss on the curved main truss by using a hoisting machine, and temporarily fixing the longitudinal sub-truss and the curved main truss;
(2) welding and fixing the longitudinal secondary truss and the curved main truss;
f. and (3) setting balance measures for the longitudinal sub-truss:
(1) installing a cable wind rope ground anchor on the ground according to the installation position of each section of longitudinal secondary truss;
(2) fixing a guy rope between the guy rope ground anchor and the longitudinal secondary truss;
g. connecting and fixing the transverse secondary truss and the longitudinal secondary truss:
(1) hoisting the transverse secondary truss on the longitudinal secondary truss by adopting a hoisting machine, and temporarily fixing the transverse secondary truss and the longitudinal secondary truss;
(2) welding and fixing the transverse sub-truss and the longitudinal sub-truss;
h. and (4) pulling horizontal supports among the curved main truss, the longitudinal sub-truss and the transverse sub-truss, and then removing the guy cable and the guy cable ground anchor.
2. The construction method for the curved-surface # -shaped combined steel truss girder of the roof as claimed in claim 1, wherein: in the step a, the main truss bodies are supported on the ground by adopting the temporary assembling devices, the supporting nodes of the temporary assembling devices for the main truss bodies are determined by adjusting the heights of the temporary assembling devices, each main truss body is correspondingly provided with at least two temporary assembling devices, then a triangular support is arranged on the ground and supports the outer ends of the main truss bodies at the outermost side, and then two adjacent sections of main truss bodies are welded into the curve-shaped main truss.
3. The construction method for the curved-surface # -shaped combined steel truss girder of the roof as claimed in claim 2, wherein: the adopted temporary assembling device comprises a cross rod, a supporting vertical rod, H-shaped steel and a truss bracket, wherein the supporting vertical rod is vertically welded on the cross rod, the H-shaped steel is provided with a connecting bolt, the supporting vertical rod is vertically and uniformly provided with at least four limiting holes, the connecting bolt penetrates through the limiting holes, the H-shaped steel is provided with an adjusting screw rod, the truss bracket is arranged on the adjusting screw rod, the adjusting screw rod is provided with an adjusting nut, and the adjusting nut supports the truss bracket;
the operation of supporting the main truss body on the ground by adopting the temporary assembling device is as follows:
(1) aiming at the position of each section of main truss body, a temporary pairing device is installed on the ground;
(2) aiming at the shape of a curve-shaped main truss, determining the position of a first section of main truss body, taking the main truss body closest to the ground as a first section, placing a sleeper on the ground, arranging the first section of main truss body on the sleeper in a cushioning manner, simultaneously supporting the main truss body by constructors, then performing height adjustment on a temporary assembling device corresponding to the first section of main truss body, specifically, vertically moving H-shaped steel on a supporting upright rod, arranging a connecting bolt on the H-shaped steel when the distance between a supporting point at the top of a truss bracket and the lowest point of an upper chord of the main truss body is within the adjusting range of an adjusting screw rod, introducing the connecting bolt into a limiting hole of the supporting upright rod, then moving the truss bracket upwards on the adjusting screw rod, attaching the truss bracket to the upper chord of the main truss body, and screwing an adjusting nut on the adjusting screw rod, and supporting the adjusting nut on the bottom surface of the truss bracket;
(3) aiming at the position of the first section of main truss main body, taking the main truss main body adjacent to the first section of main truss main body as a second section of main truss main body, lifting the second section of main truss main body, and when the welding positions of the second section of main truss main body and the first section of main truss main body are aligned with each other, performing height adjustment on a temporary assembling device corresponding to the second section of main truss main body, wherein the adjustment mode is the same as the height adjustment of the temporary assembling device corresponding to the first section of main truss main body;
(4) and lifting the rest main truss main bodies to be supported according to the position of the main truss main body after being supported, and when the welding positions of the main truss main body to be supported and the main truss main body after being supported are aligned with each other, performing height adjustment on the temporary assembling device corresponding to the main truss main body to be supported, wherein the adjustment mode is the same as the height adjustment of the temporary assembling device corresponding to the main truss main body at the first section.
4. The construction method for the curved-surface # -shaped combined steel truss girder of the roof as claimed in claim 3, wherein: and a first inclined support is arranged between the cross rod and the supporting vertical rod.
5. The construction method for the curved-surface # -shaped combined steel truss girder of the roof as claimed in claim 3, wherein: and a second inclined strut is arranged between the H-shaped steel and the supporting vertical rod.
6. The construction method for the curved-surface # -shaped combined steel truss girder of the roof as claimed in claim 1, wherein: the step c specifically comprises the following steps:
(1) installing a second connecting node on each section of the curve-shaped main truss according to the gravity center of the curve-shaped main truss, installing a first connecting node on the shoulder pole beam, winding a balance sling between the first connecting node and the second connecting node, and fixing two ends of the balance sling on the curve-shaped main truss;
(2) and fixing a hoisting cable between the hoisting machine and the shoulder pole beam, starting the hoisting machine, hoisting the curved main truss section by section onto the frame column, and fixing the curved main truss on the frame column.
7. The construction method for the curved-surface # -shaped combined steel truss girder of the roof as claimed in claim 6, wherein: and arranging a support at the top of the frame column, hanging the curved main truss on the support of the frame column section by section, and welding and fixing the curved main truss and the support of the frame column.
8. The construction method for the curved-surface # -shaped combined steel truss girder of the roof as claimed in claim 6, wherein: the first connecting node adopts a first fixed pulley, the second connecting node adopts a second fixed pulley, two first fixed pulleys are arranged on a single carrying pole beam, the second fixed pulley is arranged on the curved main truss, the central position between the two first fixed pulleys corresponds to one second fixed pulley, the balance sling is wound at the upper end of the first fixed pulley, the balance sling is wound at the lower end of the second fixed pulley, and then the two ends of the balance sling are fixed on the curved main truss.
9. The construction method for the curved-surface # -shaped combined steel truss girder of the roof as claimed in claim 1, wherein: the temporary fixing mode of the longitudinal sub-truss and the curved main truss is the same as the temporary fixing mode of the transverse sub-truss and the longitudinal sub-truss, and specifically comprises the following steps:
(1) when the longitudinal secondary truss is hoisted to the curved-shaped main truss, the longitudinal secondary truss is used as a hoisting unit, the curved-shaped main truss is used as a fixing unit, when the transverse secondary truss is hoisted to the longitudinal secondary truss, the transverse secondary truss is used as a hoisting unit, and the longitudinal secondary truss is used as a fixing unit;
(2) the hanging plate is welded on the hanging unit, the welding holes are formed in the bottom of the hanging plate, the two lug plates are welded on the fixing unit, the hanging plate on the hanging unit is clamped between the two lug plates on the fixing unit in the hanging process, the welding holes are correspondingly formed in one side of a welding joint between the hanging unit and the fixing unit at the moment, the fixing bolts are arranged between the two lug plates and the hanging plate, and then the fixing unit and the hanging unit are welded and fixed.
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