CN112482719A - Multifunctional operation platform for large-span truss and construction method thereof - Google Patents
Multifunctional operation platform for large-span truss and construction method thereof Download PDFInfo
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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
- E04G1/00—Scaffolds primarily resting on the ground
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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
- E04G1/00—Scaffolds primarily resting on the ground
- E04G1/02—Scaffolds primarily resting on the ground composed essentially of members elongated in one dimension only, e.g. poles, lattice masts, with or without end portions of special form, connected together by any means
- E04G1/04—Scaffolds primarily resting on the ground composed essentially of members elongated in one dimension only, e.g. poles, lattice masts, with or without end portions of special form, connected together by any means the members being exclusively poles, rods, beams, or other members of similar form and simple cross-section
- E04G1/06—Scaffolds primarily resting on the ground composed essentially of members elongated in one dimension only, e.g. poles, lattice masts, with or without end portions of special form, connected together by any means the members being exclusively poles, rods, beams, or other members of similar form and simple cross-section comprising members with rod-like or tubular portions fitting together end to end, with or without separate connecting pieces
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- E—FIXED CONSTRUCTIONS
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- E04G5/00—Component parts or accessories for scaffolds
- E04G5/08—Scaffold boards or planks
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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
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Abstract
The invention discloses a multifunctional operating platform for a large-span truss and a construction method thereof, and the multifunctional operating platform comprises an operating frame, a horizontal cross beam, a sleeve clamping plate, bolts and temporary supports, wherein a first guardrail is fixedly arranged above the operating frame, an upper platform is fixedly connected below the first guardrail, a middle platform is fixedly arranged in the middle of the operating frame, supporting frames are fixedly connected to the left side and the right side of the operating frame, a first connecting plate is fixedly arranged below the operating frame, a second guardrail is fixedly arranged on the left side of the bottom of the operating frame, a lower platform is fixedly arranged at the bottom end of the operating frame, the horizontal cross beam is movably arranged between the operating frame and an adjacent operating frame, and a sleeve body is movably arranged on the outer side of the horizontal cross beam. The multifunctional operation platform for the large-span truss and the construction method thereof have the advantages that the structure is simple, the installation and the disassembly are convenient, meanwhile, the multifunctional operation platform can be used for multiple functions such as installation, welding, protection, riding track and the like, and meanwhile, the safety in use is improved.
Description
Technical Field
The invention relates to the technical field of structural construction, in particular to a multifunctional operating platform for a large-span truss and a construction method thereof.
Background
The truss is usually formed by overlapping a plurality of rod-shaped assemblies, and is usually connected by welding, riveting or bolts, and in the overlapping process, the truss can be used for engineering construction after being overlapped, and is mainly used for supporting people or objects.
Some truss work platforms currently on the market:
(1) some existing truss operation platforms are single in structure and can only be used independently, so that the multiple platforms are inconvenient to lap, the use effect is poor, and the use mode is inconvenient to adjust;
(2) the existing truss operation platforms are inconvenient to install, single in function when in use, low in application range and inconvenient to assemble and disassemble the whole body;
(3) some truss operation platforms that have now, the security is relatively poor when using, and the turnover of being not convenient for is used and reuse, and the economic nature is relatively poor, is not convenient for protect through the protection frame when using, has certain potential safety hazard.
We have therefore proposed a multifunctional operation platform for a long-span truss and a construction method thereof in order to solve the problems set forth above.
Disclosure of Invention
The invention aims to provide a multifunctional operating platform for a large-span truss and a construction method thereof, and aims to solve the problems that the existing truss operating platform in the market, which is provided by the background technology, is single in structure, can only be used independently, is inconvenient for overlapping a plurality of platforms, is poor in using effect, is inconvenient for disassembling and assembling the whole, is inconvenient to use, is low in safety and has certain potential safety hazards.
In order to achieve the purpose, the invention provides the following technical scheme: a multifunctional operating platform for a large-span truss and a construction method thereof comprise an operating frame, a horizontal cross beam, a sleeve clamping plate, bolts and temporary supports, wherein a first guardrail is fixedly arranged above the operating frame, an upper platform is fixedly connected below the first guardrail, a middle platform is fixedly arranged in the middle of the operating frame, support frames are fixedly connected to the left side and the right side of the operating frame, a first connecting plate is fixedly arranged below the operating frame, a second guardrail is fixedly arranged on the left side of the bottom of the operating frame, a lower platform is fixedly arranged at the bottom end of the operating frame, the horizontal cross beam is movably arranged between the operating frame and an adjacent operating frame, a sleeve body is movably arranged on the outer side of the horizontal cross beam, the sleeve clamping plate is fixedly connected below the sleeve body, second connecting plates are fixedly arranged on the left side and the right side of the horizontal cross beam, and a truss lower chord is lapped on the side surface of the sleeve clamping, bolts are arranged between the sleeve clamping plate and the lower chord of the truss, between the sleeve body and the horizontal beam, and between the first connecting plate and the second connecting plate in a threaded mode, first screw holes are formed in the surface of the second connecting plate, second screw holes are formed in the upper portion of the sleeve body, third screw holes are formed in the side face of the sleeve clamping plate, and truss vertical web members and truss diagonal web members are connected between the operation frames and adjacent operation frames in a lap joint mode.
Preferably, the operation frames are mutually overlapped with the adjacent operation frames through the horizontal cross beam, and the operation frames and the adjacent operation frames are symmetrically distributed on the left side and the right side of the horizontal cross beam.
Preferably, first guardrail, upper mounting plate, well platform, support frame, second guardrail and lower platform are a whole, and the material of upper mounting plate, well platform and lower platform is thick decorative pattern steel sheet, be welded connection between first guardrail and second guardrail and the handling frame.
Preferably, the horizontal beam is a square steel pipe, and the horizontal beam is mutually lapped with the sleeve body through bolts.
Preferably, the sleeve clamping plates form a detachable structure with the horizontal beam and the truss lower chord through bolts, the sleeve clamping plates and the sleeve body are connected in a welding mode, and the sleeve clamping plates are symmetrically distributed on the left side and the right side of the horizontal beam.
Preferably, the second connecting plate is fixedly connected with the first connecting plate through bolts, the first connecting plate is connected with the operating frame in a welding mode, and 2 groups of the second connecting plate are symmetrically arranged on the left side and the right side of the horizontal cross beam.
Preferably, the right surface of the truss lower chord is mutually attached to the left surface of the sleeve clamping plate, and the sleeve clamping plate is fixed with the truss lower chord through a bolt.
Preferably, the lower lapping platform is lapped between two adjacent operation frames, a truss upper chord is arranged above the operation frames, the middle lapping platform is arranged in the middle of the operation frames, and a temporary support is arranged below the operation frames.
A construction method of a multifunctional operation platform for a large-span truss comprises the following steps:
s1, building high-altitude splicing temporary supports along the lower chord direction of the truss according to the lower chord subsection of the truss;
s2, starting to hoist and mount the first section of the lower chord of the truss from two ends, connecting the first section of the lower chord of the truss with the side column and the temporary support, and sequentially hoisting and mounting the second section of the lower chord of the truss until the installation of the lower chord is finished;
s3, installing a horizontal beam of the multifunctional operating platform on the lower chord of the truss without welding, and screwing and propping the horizontal beam by bolts;
s4, mounting an operation frame of the multifunctional operation platform and connecting the operation frame with bolts;
s5, mounting a lower lapping platform and a middle lapping platform;
s6, using the lower platform and the middle platform of the operation frame as supports, and hoisting and installing truss vertical web members and truss diagonal web members;
s7, hanging and installing the truss upper chord by taking the upper platform of the operation frame as a support;
s8, welding the joint positions of the truss sections by taking a lower platform, a middle platform, an upper platform, a lower lapping platform and a middle lapping platform of the operation frame as supports;
s9, after the truss is installed and welded, sequentially detaching the lower lapping platform, the middle lapping platform, the operating frame and the horizontal cross beam;
and S10, repeating the steps S1-S9, and installing and welding the rest trusses until the truss installation is finished.
Preferably, well platform the upper mounting plate all adopts two parallel arrangement's of square steel pipe and support frame welding formation triangle-shaped frame as the support, the support frame also forms for square steel pipe welding, the three strong point of triangle-shaped frame include two square steel pipe welding formation first strong point, the square steel pipe of level setting with the second strong point that the square steel pipe vertical welding of support frame formed, the third strong point that the vertical contained angle more than or equal to 30 degrees welding of square steel pipe of slope setting and the square steel pipe of support frame formed, well platform or the bearing limit of upper mounting plate can be calculated by following formula:
step A1: calculating the bearing limit load Q of the first supporting point1：
Wherein σpFor the yield strength, tau, of the horizontally arranged square steel tubepFor the wall thickness of the horizontally arranged square steel tube, hxThe height of the square steel pipe is set in an inclined way, alpha is the included angle between the square steel pipe which is horizontally set and the square steel pipe which is obliquely set, alpha is more than or equal to 30 degrees, sin is the sine function of the trigonometric function, and f (epsilon)p) The influence coefficient of the internal force of the horizontally arranged square steel pipe on the load bearing of the first supporting point is mu, and mu is the ratio of the width of the obliquely arranged square steel pipe to the width of the horizontally arranged square steel pipe;
calculating the weight bearing of the second support pointUltimate load Q2：
Wherein rho is the buckling coefficient of the horizontally arranged square steel pipe, hzThe height of the square steel tube of the support frame is set;
calculating the bearing limit load Q of the third supporting point3：
Wherein σzIs the yield strength, tau, of the square steel tube of the support framezIs the wall thickness h of the square steel tube of the support framexThe height of the square steel tube is set, beta is the included angle between the square steel tube of the support frame and the square steel tube which is set obliquely, beta is more than or equal to 30 degrees, f (epsilon)z) The influence coefficient of the internal force of the square steel pipe of the support frame on the bearing load of the third support point is gamma, and gamma is the ratio of the width of the obliquely arranged square steel pipe to the width of the square steel pipe of the support frame;
step A2: the load bearing limit load Q of the three supporting points calculated in the step A11、Q2、Q3And selecting the minimum value of the load-bearing limit load as the load-bearing limit value of the middle platform or the upper platform.
Compared with the prior art, the invention at least comprises the following beneficial effects:
the invention relates to a multifunctional operating platform for a large-span truss and a construction method thereof, wherein the multifunctional operating platform comprises the following steps:
(1) compared with a conventional operation platform, the operation platform can lap joint a plurality of truss assemblies through a horizontal cross beam below the truss assemblies, two adjacent operation frames are fixed through the horizontal cross beam, and meanwhile, the stability during lapping can be ensured through the pipe sleeve body and the pipe sleeve clamping plate on the horizontal cross beam, so that the overall stability of the operation platform is improved, the lapping is convenient, the loading and unloading work of a plurality of groups of operation frames can be conveniently and directly carried out by detaching the horizontal cross beam in the follow-up process, and the use convenience of the device is improved;
(2) the operation frames in the operation platform are mutually lapped through the middle lapping platform and the lower lapping platform, and meanwhile, the adjacent operation frames are supported and fixed through the truss vertical web members and the truss inclined web members, so that the stability of the whole operation platform is ensured, the operation platform can be installed, welded, protected, paved on roads and other functions, and the use safety and the use convenience are improved;
(3) this handling frame not only can a plurality of jointly use, also can dismantle independent utility alone, conveniently has enough to meet the need the use and reuse, and economic nature is good, and the first guardrail of handling frame top and the second guardrail of below can provide the safety guarantee simultaneously, have increased the security when handling frame uses.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of the overall structure of the handling frame of the present invention;
FIG. 2 is a front view of the operation frame of the present invention;
FIG. 3 is a schematic view of the structure of FIG. 2 at A according to the present invention;
FIG. 4 is a side view of the operation frame of the present invention;
FIG. 5 is a schematic view of the overlapping structure of the handling frame and the adjacent handling frame of the present invention;
FIG. 6 is a schematic view of the structure of FIG. 5 at B in accordance with the present invention;
FIG. 7 is a schematic top view of the horizontal beam of the present invention;
FIG. 8 is a schematic view of the overall structure of the temporary support of the present invention;
FIG. 9 is a schematic view of the connection structure of the upper platform, the middle platform and the supporting frame according to the present invention;
FIG. 10 is a schematic view of the structure of a horizontally arranged square steel pipe and an obliquely arranged square steel pipe according to the present invention.
In the figure: 1. an operation frame; 2. a first guardrail; 3. an upper platform; 4. a middle platform; 5. a support frame; 6. a first connecting plate; 7. a second guard rail; 8. a lower platform; 9. a horizontal cross beam; 10. a sleeve clamping plate; 11. a sleeve body; 12. a second connecting plate; 13. truss lower chord; 14. a bolt; 15. a first screw hole; 16. a second screw hole; 17. a third screw hole; 18. truss vertical web members; 19. a lower lap joint platform; 20. the truss is strung; 21. truss diagonal web members; 22. a middle lapping platform; 23. temporary support; 24. a horizontally arranged square steel pipe; 25. a square steel pipe arranged obliquely; 26. a square steel tube of the support frame; alpha, the included angle between the horizontally arranged square steel pipe and the obliquely arranged square steel pipe; beta, the included angle between the square steel pipe of the support frame and the obliquely arranged square steel pipe; w is apThe width of the horizontally arranged square steel pipe; h isxAnd the height of the square steel pipe is obliquely arranged.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-10, the present invention provides a technical solution: a multifunctional operating platform for a large-span truss and a construction method thereof comprise an operating frame 1, a first guardrail 2, an upper platform 3, a middle platform 4, a support frame 5, a first connecting plate 6, a second guardrail 7, a lower platform 8, a horizontal cross beam 9, a sleeve clamping plate 10, a sleeve body 11, a second connecting plate 12, a truss lower chord 13, a bolt 14, a first screw hole 15, a second screw hole 16, a third screw hole 17, a truss vertical web member 18, a lower lap platform 19, a truss upper chord 20, a truss diagonal web member 21, a middle lap platform 22 and a temporary support 23, wherein the first guardrail 2 is fixedly arranged above the operating frame 1, the upper platform 3 is fixedly connected below the first guardrail 2, the middle platform 4 is fixedly arranged in the middle of the operating frame 1, the support frame 5 is fixedly connected to the left side and the right side of the operating frame 1, the first connecting plate 6 is fixedly arranged below the operating frame 1, a second guardrail 7 is fixedly arranged at the left side of the bottom of the operation frame 1, a lower platform 8 is fixedly arranged at the bottom end of the operation frame 1, a horizontal beam 9 is movably arranged between the operation frame 1 and the adjacent operation frame 1, a sleeve pipe body 11 is movably arranged at the outer side of the horizontal beam 9, a sleeve clamping plate 10 is fixedly connected below the sleeve body 11, second connecting plates 12 are fixedly arranged at the left side and the right side of the horizontal beam 9, a truss lower chord 13 is lapped on the side surface of the sleeve clamping plate 10, and bolts 14 are arranged between the sleeve clamping plate 10 and the truss lower chord 13, between the sleeve body 11 and the horizontal beam 9, and between the first connecting plate 6 and the second connecting plate 12 in a threaded manner, and the surface of the second connecting plate 12 is provided with a first screw hole 15, the upper part of the sleeve pipe body 11 is provided with a second screw hole 16, the side surface of the sleeve pipe clamping plate 10 is provided with a third screw hole 17, and a truss vertical web member 18 and a truss inclined web member 21 are lapped between the operating frame 1 and the adjacent operating frame 1.
The operation frame 1 is mutually overlapped with the adjacent operation frame 1 through the horizontal cross beam 9, and the operation frame 1 and the adjacent operation frame 1 are symmetrically distributed on the left side and the right side of the horizontal cross beam 9.
The horizontal beam 9 is a square steel pipe, and the horizontal beam 9 is mutually lapped with the sleeve body 11 through a bolt 14.
The sleeve clamping plates 10 form a detachable structure with the horizontal cross beam 9 and the truss lower chord 13 through bolts 14, the sleeve clamping plates 10 are connected with the sleeve body 11 in a welding mode, and the sleeve clamping plates 10 are symmetrically distributed on the left side and the right side of the horizontal cross beam 9.
The second connecting plate 12 is fixedly connected with the first connecting plate 6 through bolts 14, the first connecting plate 6 is connected with the operating frame 1 in a welding mode, and 2 groups of the second connecting plate 12 are symmetrically arranged on the left side and the right side of the horizontal cross beam 9.
The right surface of the truss lower chord 13 is mutually attached to the left surface of the sleeve clamping plate 10, and the sleeve clamping plate 10 is fixed with the truss lower chord 13 through a bolt 14.
The lower lapping platform 19 is lapped between two adjacent operation frames 1, a truss upper chord 20 is arranged above the operation frames 1, a middle lapping platform 22 is arranged in the middle of the operation frames 1, and a temporary support 23 is arranged below the operation frames 1.
A construction method of a multifunctional operation platform for a large-span truss comprises the following steps:
s1, setting up an overhead splicing temporary support 23 along the direction of the truss lower chord 13 according to the segmentation of the truss lower chord 13;
s2, starting to hoist and mount the first section of the truss lower chord 13 from two ends, connecting the first section of the truss lower chord 13 with the side column and the temporary support 23, and sequentially hoisting and mounting the second section of the truss lower chord 13 until the lower chord mounting is completed;
s3, installing the horizontal beam 9 of the multifunctional operating platform on the lower chord 13 of the truss without welding, and screwing and propping the horizontal beam by bolts 14;
s4, mounting the operation frame 1 of the multifunctional operation platform and connecting the operation frame with bolts 14;
s5, mounting the lower lapping platform 19 and the middle lapping platform 22;
s6, using the lower platform 8 and the middle platform 4 of the operation frame 1 as supports, and hoisting and installing the truss vertical web members 18 and the truss diagonal web members 21;
s7, hanging and installing the truss upper chord 20 by taking the upper platform 3 of the operation frame 1 as a support;
s8, welding the joint positions of the truss sections by taking the lower platform 8, the middle platform 4, the upper platform 3, the lower lapping platform 19 and the middle lapping platform 22 of the operation frame as supports;
s9, after the truss is installed and welded, sequentially detaching the lower lapping platform 19, the middle lapping platform 22, the handling frame 1 and the horizontal cross beam 9;
s10, repeating the steps S1-S9, installing and welding the rest trusses until the truss installation is finished, the temporary supports 23 are erected according to the truss sections, the truss lower chord 13 is hoisted and installed, the multifunctional operation platform is installed, the truss web members and the truss upper chord 20 are hoisted and installed by the multifunctional operation platform, the welding of the truss section interface position is carried out by the multifunctional operation platform, the multifunctional operation platform is disassembled, the rest trusses are repeatedly utilized and installed, the multifunctional operation platform comprises the horizontal cross beam 9 and the operation frame, the installation and the disassembly are simple and convenient, the operation platform is provided for the installation and the welding of the truss, and the safety protection function is realized, the lower platform 8 and the lower lapping platform 19 are connected into a through long channel along the lower chord 13 of the truss, which is the use process and the construction method of the whole operation platform, and those not described in detail in this specification are well within the skill of those in the art.
Preferably, in S8, when welding the positions of the truss segment joints, firstly, the thermal value of the truss segment joints is obtained through an infrared detector, and then welding is performed according to the following method:
the welding time period is calculated according to the following formula,
in the formula, T is welding duration, alpha is a thermal conductivity coefficient, c is a thermal value of the truss segmented interface when the material of the truss segmented interface reaches interatomic fusion, W is the thermal value of the truss segmented interface obtained by the infrared detector, a is a specific heat capacity of the truss segmented interface material, Q is internal heat source intensity of a welding tool, rho is the density of the truss segmented interface material, and T is a temperature function of the truss segmented interface,
is a partial derivative symbol, mu is welding specific heat flow, x is an abscissa of a welding point on the truss section interface, and y is an ordinate of the welding point on the truss section interface;
and then welding the truss section interface according to the calculated welding time when the position of the truss section interface is welded.
Has the advantages that: the welding of truss section interface position is carried out through above-mentioned technical scheme not only the welding is firm, can not lead to the wasting of resources and the damage of truss section interface because of the welding time is long moreover to the coefficient of heat conductivity who calculates becomes dynamic change according to the temperature of truss section interface, accords with actual conditions more, thereby makes the long more accurate of welding of calculation, in addition, the welding time of upper formula with the material of truss section interface reaches the heat that the interatomic fusion fuses closely and is correlated with, makes the truss section interface can fine linking fusion, thereby makes the holistic stability of operation platform is higher.
Referring to fig. 9-10, in a construction method of a multifunctional operation platform for a large-span truss, the middle platform and the upper platform all adopt two triangular frames which are formed by welding square steel pipes and support frames and are arranged in parallel as supports, the support frames are also formed by welding square steel pipes, three support points of the triangular frames comprise first support points formed by welding two square steel pipes, second support points formed by vertically welding horizontally arranged square steel pipes and the square steel pipes of the support frames, and third support points formed by welding obliquely arranged square steel pipes and the square steel pipes of the support frames with a vertical included angle of more than or equal to 30 degrees, and the bearing limit of the middle platform or the upper platform can be calculated by the following formula:
step A1: calculating the bearing limit load Q of the first supporting point1：
Wherein σpFor the yield strength, tau, of the horizontally arranged square steel tubepFor the wall thickness of the horizontally arranged square steel tube, hxAlpha is the included angle between the horizontally arranged square steel pipe and the obliquely arranged square steel pipe, alpha is more than or equal to 30 degrees, sin is the sine function of the trigonometric function,f(εp) The influence coefficient of the internal force of the horizontally arranged square steel pipe on the load bearing of the first supporting point is mu, and mu is the ratio of the width of the obliquely arranged square steel pipe to the width of the horizontally arranged square steel pipe;
calculating the bearing limit load Q of the second supporting point2：
Wherein rho is the buckling coefficient of the horizontally arranged square steel pipe, hzThe height of the square steel tube of the support frame is set;
calculating the bearing limit load Q of the third supporting point3：
Wherein σzIs the yield strength, tau, of the square steel tube of the support framezIs the wall thickness h of the square steel tube of the support framexThe height of the square steel tube is set, beta is the included angle between the square steel tube of the support frame and the square steel tube which is set obliquely, beta is more than or equal to 30 degrees, f (epsilon)z) The influence coefficient of the internal force of the square steel pipe of the support frame on the bearing load of the third support point is gamma, and gamma is the ratio of the width of the obliquely arranged square steel pipe to the width of the square steel pipe of the support frame;
step A2: the load bearing limit load Q of the three supporting points calculated in the step A11、Q2、Q3And selecting the minimum value of the load-bearing limit load as the load-bearing limit value of the middle platform or the upper platform.
The working principle and the beneficial effects of the technical scheme are as follows: in the above algorithm, values of μ and γ are less than or equal to 0.85, f (ε)p) And f (ε)z) The value of (a) is related to the axial force, bending moment and yield strength of the corresponding square steel pipe, when epsilon isp≥0，f(εp) When ═ 1, when ∈p<0，f(εp) 1 or less, likewise, when epsilonz≥0，f(εz) When ═ 1, when ∈z<0，f(εz) Less than or equal to 1; because the upper platform and the middle platform are both positioned in the air and need to be installed by adopting supports, under the condition that the self strength of the upper platform and the middle platform is enough, main stress points are positioned at the three support points, the load-bearing limit load of each support point is calculated by considering the height, the width and the wall thickness of a square steel pipe adopted by the triangular frame and the angle of each angle of the triangular frame in the algorithm, more accurate load-bearing limit load values can be obtained, the stress of each support point is different, the stress of the three support points is calculated respectively, the value with the minimum load-bearing limit load in the three support points is selected as the load-bearing limit value of the middle platform or the upper platform, the stability of the platform can be better ensured, the damage of the support points caused by the overload of the platform is prevented, and the use safety of the operation platform is further ensured.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (10)
1. The utility model provides a multi-functional operation platform for large-span truss, includes handling frame (1), horizontal beam (9), sleeve pipe cardboard (10), bolt (14) and interim support (23), its characterized in that: a first guardrail (2) is fixedly arranged above the operation frame (1), an upper platform (3) is fixedly connected below the first guardrail (2), a middle platform (4) is fixedly arranged in the middle of the operation frame (1), support frames (5) are fixedly connected on the left side and the right side of the operation frame (1), a first connecting plate (6) is fixedly arranged below the operation frame (1), a second guardrail (7) is fixedly arranged on the left side of the bottom of the operation frame (1), a lower platform (8) is fixedly arranged at the bottom end of the operation frame (1), a horizontal cross beam (9) is movably arranged between the operation frame (1) and the adjacent operation frame (1), a sleeve body (11) is movably arranged on the outer side of the horizontal cross beam (9), a sleeve clamping plate (10) is fixedly connected below the sleeve body (11), and second connecting plates (12) are fixedly arranged on the left side and the right side of the horizontal cross beam (9), truss bottom chord (13) is lapped on the side surface of the sleeve clamping plate (10), bolts (14) are installed between the sleeve clamping plate (10) and the truss bottom chord (13), between the sleeve body (11) and the horizontal cross beam (9) and between the first connecting plate (6) and the second connecting plate (12) in a threaded mode, first screw holes (15) are formed in the surface of the second connecting plate (12), second screw holes (16) are formed in the upper portion of the sleeve body (11), third screw holes (17) are formed in the side surface of the sleeve clamping plate (10), truss vertical web members (18) and truss diagonal web members (21) are lapped between the operation frame (1) and the adjacent operation frame (1).
2. A multifunctional operating platform for large span trusses according to claim 1, wherein: the operation frame (1) is mutually overlapped with the adjacent operation frame (1) through the horizontal cross beam (9), and the operation frame (1) and the adjacent operation frame (1) are symmetrically distributed on the left side and the right side of the horizontal cross beam (9).
3. A multifunctional operating platform for large span trusses according to claim 1, wherein: first guardrail (2), upper mounting plate (3), well platform (4), support frame (5), second guardrail (7) and lower platform (8) are a whole, and the material of upper mounting plate (3), well platform (4) and lower platform (8) is the thick decorative pattern steel sheet, be welded connection between first guardrail (2) and second guardrail (7) and handling frame (1).
4. A multifunctional operating platform for large span trusses according to claim 1, wherein: the horizontal cross beam (9) is a square steel pipe, and the horizontal cross beam (9) is mutually overlapped with the sleeve body (11) through bolts (14).
5. A multifunctional operating platform for large span trusses according to claim 1, wherein: the sleeve clamping plates (10) form a detachable structure with the horizontal beam (9) and the truss lower chord (13) through bolts (14), the sleeve clamping plates (10) are connected with the sleeve body (11) in a welding mode, and the sleeve clamping plates (10) are symmetrically distributed on the left side and the right side of the horizontal beam (9).
6. A multifunctional operating platform for large span trusses according to claim 1, wherein: the second connecting plate (12) is fixedly connected with the first connecting plate (6) through bolts (14), the first connecting plate (6) is connected with the operating frame (1) in a welding mode, and 2 groups of the second connecting plate (12) are symmetrically arranged on the left side and the right side of the horizontal cross beam (9).
7. A multifunctional operating platform for large span trusses according to claim 1, wherein: the right surface of the truss lower chord (13) is mutually attached to the left surface of the sleeve clamping plate (10), and the sleeve clamping plate (10) is fixed with the truss lower chord (13) through a bolt (14).
8. A multifunctional operating platform for large span trusses according to claim 1, wherein: the lower lapping platform (19) is lapped between two adjacent operation frames (1), a truss upper chord (20) is arranged above the operation frames (1), a middle lapping platform (22) is arranged in the middle of the operation frames (1), and a temporary support (23) is arranged below the operation frames (1).
9. A construction method of a multifunctional operation platform for a large-span truss is characterized by comprising the following steps:
s1, erecting an overhead splicing temporary support (23) along the direction of the truss lower chord (13) according to the segmentation of the truss lower chord (13);
s2, starting to hoist and mount the first section of the truss lower chord (13) from two ends, connecting the first section of the truss lower chord (13) with the side column and the temporary support (23), and sequentially hoisting and mounting the second section of the truss lower chord (13) until the installation of the lower chord is finished;
s3, installing a horizontal beam (9) of the multifunctional operating platform on the lower chord (13) of the truss without welding, and screwing and propping by bolts (14);
s4, mounting the operation frame (1) of the multifunctional operation platform, and connecting the operation frame with bolts (14);
s5, mounting a lower lapping platform (19) and a middle lapping platform (22);
s6, using the lower platform (8) and the middle platform (4) of the operation frame (1) as supports, and hoisting and installing truss vertical web members (18) and truss inclined web members (21);
s7, hanging and installing the truss upper chord (20) by taking the upper platform (3) of the operation frame (1) as a support;
s8, welding the joint positions of the truss sections by taking the lower platform (8), the middle platform (4), the upper platform (3), the lower lapping platform (19) and the middle lapping platform (22) of the operation frame as supports;
s9, after the truss is installed and welded, sequentially detaching the lower lapping platform (19), the middle lapping platform (22), the operating frame (1) and the horizontal cross beam (9);
and S10, repeating the steps S1-S9, and installing and welding the rest trusses until the truss installation is finished.
10. The construction method of the multifunctional operating platform for the large-span truss according to claim 9, wherein the middle platform (4) and the upper platform (3) both adopt two triangular frames which are formed by welding square steel pipes and supporting frames (5) and are arranged in parallel as supports, the supporting frames (5) are also formed by welding square steel pipes, three supporting points of the triangular frames comprise a first supporting point formed by welding two square steel pipes, a second supporting point formed by vertically welding horizontally arranged square steel pipes and the square steel pipes of the supporting frames (5), and a third supporting point formed by welding obliquely arranged square steel pipes and the supporting frames (5) with a vertical included angle of more than or equal to 30 degrees, and the bearing limit of the middle platform (4) or the upper platform (3) can be calculated by the following formula:
step A1: calculating the bearing limit load Q of the first supporting point1：
Wherein σpFor the yield strength, tau, of the horizontally arranged square steel tubepFor the wall thickness of the horizontally arranged square steel tube, hxThe height of the square steel pipe is set in an inclined way, alpha is the included angle between the square steel pipe which is horizontally set and the square steel pipe which is obliquely set, alpha is more than or equal to 30 degrees, sin is the sine function of the trigonometric function, and f (epsilon)p) The influence coefficient of the internal force of the horizontally arranged square steel pipe on the load bearing of the first supporting point is mu, and mu is the ratio of the width of the obliquely arranged square steel pipe to the width of the horizontally arranged square steel pipe;
calculating the bearing limit load Q of the second supporting point2：
Wherein rho is the buckling coefficient of the horizontally arranged square steel pipe, hzThe height of the square steel tube of the support frame is set;
calculating the bearing limit load Q of the third supporting point3：
Wherein σzIs the yield strength, tau, of the square steel tube of the support framezIs the wall thickness h of the square steel tube of the support framexThe height of the square steel tube is set, beta is the included angle between the square steel tube of the support frame and the square steel tube which is set obliquely, beta is more than or equal to 30 degrees, f (epsilon)z) The influence coefficient of the internal force of the square steel pipe of the support frame on the bearing load of the third support point is gamma, and gamma is the ratio of the width of the obliquely arranged square steel pipe to the width of the square steel pipe of the support frame;
step A2: the load bearing limit load Q of the three supporting points calculated in the step A11、Q2、Q3And selecting the minimum value of the load-bearing limit load as the load-bearing limit value of the middle platform (4) or the upper platform (3).
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06240874A (en) * | 1993-02-19 | 1994-08-30 | Takenaka Komuten Co Ltd | Construction of truss beam for long span |
| CN103046754A (en) * | 2011-10-13 | 2013-04-17 | 永升建设集团有限公司 | Construction method for abutting high-altitude long-span roof pipe trusses by adjustable temporary support |
| CN204626915U (en) * | 2015-05-22 | 2015-09-09 | 中冶建工集团有限公司 | A kind of large span heavy in section truss is across interior assembling rack platform |
| CN215167758U (en) * | 2020-11-16 | 2021-12-14 | 北京市机械施工集团有限公司 | Multifunctional operation platform for large-span truss |
-
2020
- 2020-11-16 CN CN202011276277.9A patent/CN112482719B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06240874A (en) * | 1993-02-19 | 1994-08-30 | Takenaka Komuten Co Ltd | Construction of truss beam for long span |
| CN103046754A (en) * | 2011-10-13 | 2013-04-17 | 永升建设集团有限公司 | Construction method for abutting high-altitude long-span roof pipe trusses by adjustable temporary support |
| CN204626915U (en) * | 2015-05-22 | 2015-09-09 | 中冶建工集团有限公司 | A kind of large span heavy in section truss is across interior assembling rack platform |
| CN215167758U (en) * | 2020-11-16 | 2021-12-14 | 北京市机械施工集团有限公司 | Multifunctional operation platform for large-span truss |
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