CN111042543A - Large-span roof truss construction method - Google Patents
Large-span roof truss construction method Download PDFInfo
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- CN111042543A CN111042543A CN201911312641.XA CN201911312641A CN111042543A CN 111042543 A CN111042543 A CN 111042543A CN 201911312641 A CN201911312641 A CN 201911312641A CN 111042543 A CN111042543 A CN 111042543A
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- truss
- hoisting
- temporary support
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- truss structure
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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
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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
- E04G21/16—Tools or apparatus
- E04G21/162—Handles to carry construction blocks
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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
- E04G21/16—Tools or apparatus
- E04G21/18—Adjusting tools; Templates
- E04G21/1841—Means for positioning building parts or elements
- E04G21/185—Means for positioning building parts or elements for anchoring elements or elements to be incorporated in the structure
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- Structural Engineering (AREA)
- Conveying And Assembling Of Building Elements In Situ (AREA)
Abstract
The invention provides a construction method of a large-span roof truss, which comprises the steps of determining the position of a temporary support frame; then determining the hoisting sequence and hoisting route of each section of the sectional hoisting piece; mounting the temporary support assembly on the floor structure steel beam; installing a plurality of pressure-bearing pieces on the temporary support assembly; sequentially hoisting the multi-section sectional hoisting pieces and the embedding and repairing rods on the plurality of pressure-bearing pieces respectively, and splicing in the high altitude; after the truss structure is assembled, the temporary support assembly is disassembled; the disassembly steps are as follows: cutting off the pressure-bearing part, and controlling the height of each cutting off according to the unloading displacement amount of the supporting position until the truss structure does not generate downward displacement after a certain cutting off is finished; the temporary support assembly is then removed. According to the construction method of the large-span roof truss, provided by the invention, the deflection of the truss is adjusted by adopting a method of cutting off the pressure-bearing part for multiple times, so that each part of the truss structure can move slowly, and the unloading precision can be conveniently controlled.
Description
Technical Field
The invention belongs to a truss hoisting construction method, and particularly relates to a large-span roof truss construction method.
Background
When the roof structure top is a large-span truss, the selection of a large-span steel beam and a truss installation scheme is a key point of steel structure installation and is also a difficult point. Most of the existing schemes are an integral lifting method, a sliding installation method and the like. The hoisting methods have high cost, high safety risk and large required construction site. In addition, for adjusting the vertical deflection deformation generated in the installation process and after the installation of the large-span truss, in the prior art, a wood wedge is mostly adopted as an unloading device, and after the installation of the truss is completed, the wood wedge is knocked down in times, so that the truss structure generates certain displacement, but the wood wedge is used for adjusting the integral deflection of the truss structure, the unloading precision is difficult to control, and the deformation of the integral deflection of the truss structure is not facilitated.
Disclosure of Invention
The invention aims to provide a construction method of a large-span roof truss, aiming at solving the problems that the whole deflection of the truss structure is adjusted by using a wood wedge, the construction quality is difficult to control, and the deformation of the whole deflection of the truss structure is not facilitated.
In order to achieve the purpose, the invention adopts the technical scheme that: the construction method of the large-span roof truss is provided, and comprises the following steps:
s1, determining the position of the temporary support frame; segmenting the truss into a plurality of segments of hoisting pieces and a plurality of embedding rods, and then determining the hoisting sequence and hoisting route of each segment of the segment hoisting pieces;
s2, mounting the temporary support assembly on the floor structural steel beam; mounting a plurality of pressure bearing members on the temporary support assembly;
s3, sequentially hoisting the sectional hoisting pieces and the embedding rods on the pressure-bearing pieces respectively, and splicing in high altitude;
s4, after the truss structure is assembled, disassembling the temporary support assembly;
s5, welding the truss structure;
step S4 includes the following steps:
s4.1, cutting off the pressure-bearing part, and controlling the cutting height of each time according to the unloading displacement amount of the supporting position until the truss structure does not generate downward displacement after a certain cutting off is finished; and then respectively dismantling the pressure-bearing part, the support steel beam and the temporary support frame.
As another embodiment of the application, the pressure-bearing part comprises a connecting pipe, one end of the connecting pipe is provided with a clamping groove used for being clamped with the truss structure, and the other end of the connecting pipe is fixedly connected with the supporting steel beam; the cutting operation is used for changing the depth of the clamping groove.
As another embodiment of the present application, step S2 includes the following steps:
s2.1, respectively installing a plurality of temporary support frames on the floor structural steel beams;
s2.2, mounting a plurality of rows of support steel beams on a working surface formed by the tops of the temporary support frames;
and S2.3, mounting a plurality of pressure-bearing parts for supporting the truss structure at the top end of each row of the supporting steel beam.
As another embodiment of the application, the pressure-bearing part comprises a connecting pipe, one end of the connecting pipe is provided with a clamping groove used for being clamped with the truss structure, and the other end of the connecting pipe is fixedly connected with the supporting steel beam; the cutting operation is used for increasing the depth of the clamping groove.
As another embodiment of the present application, the height of each cutting is controlled to be 5-10 mm.
As another embodiment of the present application, step S3 includes the following steps:
s3.1, construction of a single-row truss structure: firstly, mounting a certain section of sectional hoisting piece on a supporting working surface formed by a plurality of pressure-bearing pieces; then sequentially installing a plurality of hoisting subsections at two ends of the subsection hoisting piece to form a row of truss structure;
and S3.2, arranging a plurality of rows of structures obtained by the S3.1 on the supporting working surface at intervals until the supporting working surface is fully paved.
S3.3, installing the embedded rods between the adjacent single-row truss structures;
s3.4, sequentially installing the rest roof truss structures;
s3.5, installing the embedding rod in the middle position;
and S3.6, installing a single-layer structural part.
As another embodiment of the application, each row of the supporting steel beams is composed of a plurality of supporting beams connected end to end.
As another embodiment of this application, interim support frame is connected with floor structure girder steel through the conversion girder steel.
As another embodiment of the present application, the displacement amount of the deformation control point is monitored in step S5.
As another embodiment of the present application, when the truss structure is not displaced, the lower end surfaces of the truss structures are located at the same horizontal plane.
As another embodiment of the present application, when the truss structure is not displaced, the lower end surfaces of the truss structures are located at the same horizontal plane.
The construction method of the large-span roof truss provided by the invention has the beneficial effects that: compared with the prior art, the construction method of the large-span roof truss provided by the invention has the advantages that the deflection of the truss is adjusted by cutting off the pressure-bearing piece for multiple times, the slow movement of each part of the truss structure is facilitated, and the unloading precision can be conveniently controlled. The truss structure is installed in a sectional hoisting mode, the sectional hoisting pieces 21 are transported to the site after being manufactured in a factory, the sectional hoisting pieces and the embedded rods between the sectional hoisting pieces are installed in a high-altitude scattered assembly mode, and the problem that the site construction site is insufficient can be effectively solved through the installation method.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a construction method of a large-span roof truss according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of a connection relationship between a temporary support frame and a support steel beam according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a connection relationship between a temporary support assembly and a sectional hoisting member according to an embodiment of the present invention;
FIG. 4 is a schematic structural view of a connection relationship between a plurality of sectional hoisting members employed in the embodiment of the present invention;
FIG. 5 is a schematic structural view of a connection relationship between a sectional hoisting member and a compensating rod according to an embodiment of the present invention;
in the figure: 1. a temporary support assembly; 11. a temporary support frame; 12. supporting the steel beam; 13. a pressure-bearing member; 21. hoisting the parts in sections; 22. a rod is embedded and repaired; 3. a jack.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 to 5, a method for constructing a long-span roof truss according to the present invention will now be described. The construction method of the large-span roof truss comprises the following steps:
s1, determining the position of the temporary support frame 11; the method comprises the steps of segmenting a truss into a plurality of segments of hoisting pieces 21 and a plurality of embedding rods 22, and then determining the hoisting sequence and hoisting route of each segment of hoisting pieces 21;
s2, mounting the temporary support assembly 1 on a floor structural steel beam; installing a plurality of pressure bearing members 13 on the temporary support assembly 1;
s3, hoisting the multi-section sectional hoisting piece 21 and the embedded rod 22 in sequence, and splicing and installing at high altitude;
s4, after the truss structure is assembled, disassembling the temporary support assembly 1;
and S5, welding the truss structure.
Step S4 includes the following steps:
s4.1, cutting off the pressure-bearing part 13, and controlling the cutting height each time according to the unloading displacement amount of the supporting position until the truss structure does not generate downward displacement after a certain cutting off is finished; and then the bearing parts 13, the support steel beams 12 and the temporary support frames 11 are respectively removed.
Compared with the prior art, the construction method of the large-span roof truss provided by the invention has the advantages that the deflection of the truss is adjusted by cutting off the pressure-bearing part 13 for multiple times, the slow movement of each part of the truss structure is facilitated, the unloading precision can be conveniently controlled, and the construction quality is convenient to control. The truss structure is installed in a sectional hoisting mode, the sectional hoisting piece 21 is transported to the site after being manufactured in a factory, the sectional hoisting piece 21 and the embedded rod 22 between the sectional hoisting pieces 21 are installed in a high-altitude scattered assembly mode, and the problem of insufficient site construction sites can be effectively solved by the installation method.
It should be noted that an L-shaped truss formed by a vertical truss and a horizontal segment connected to the vertical truss is used as a segmented hoisting member 21, and an oblique truss rod member is used as a patching rod 22. The truss structure subsection sets up interim supporting component 1, and inlaying pole 22, the individual layer structure member of segmentation between the hoist and mount piece adopt the mode of high altitude to piece together scattered the installation, can effectively solve the not enough problem in site operation place.
In this embodiment, the truss structure is installed by adopting a sectional hoisting mode, a rigid temporary supporting component 1 is arranged at the sectional position, and the installation process is timely monitored and positioned. The sectional hoisting piece 21 of the truss structure is assembled in a factory, and the assembling precision is higher than that of field assembling. For a large-span truss, vertical deflection deformation generated in the installation process and after the installation is considered, and proper arching needs to be considered during manufacturing and installation according to design and standard requirements.
In the present embodiment, step S2 includes the following steps:
s2.1, respectively installing a plurality of temporary support frames 11 on the floor structural steel beams;
s2.2, mounting a plurality of rows of support steel beams 12 on a working surface formed on the tops of the temporary support frames 11;
s2.3, mounting a plurality of pressure-bearing parts 13 for supporting a truss structure at the top end of each row of supporting steel beams 12;
the temporary support assembly 1 is composed of a temporary support frame 11, a support steel beam 12 and a pressure bearing part 13, and plays a role in temporarily supporting the truss structure.
In this embodiment, each row of supporting steel beams 12 is composed of a plurality of supporting beams connected end to end, so that the supporting steel beams 12 can be conveniently detached by operators, and the working efficiency of the operators for detaching and installing the supporting steel beams 12 is improved.
S3, hoisting the multi-section hoisting sectional pieces 21 and the embedded rod pieces 22 in sequence, and splicing and installing at high altitude;
3.1, segmenting the truss:
the segmentation principle is as follows: the hoisting capacity of the tower crane is met; and the segmented material is convenient to process, manufacture, transport and install on site.
The truss structure is installed in a sectional hoisting mode and limited by the transportation length, the sectional hoisting piece 21 is manufactured into an L-shaped truss and transported to the site, and the maximum sectional weight is 7.17 tons. During installation, the temporary supporting component 1 is erected at the butt joint of the sectional hoisting piece 21, the sectional hoisting piece 21 is directly installed in place by using a tower crane, and the sectional hoisting piece 21 is manufactured in a factory and then is transported to the site.
3.2 temporary support Assembly 1 arrangement
3.2.1 temporary support Assembly 1 arrangement principle
The temporary supporting component 1 adopts a lattice type support, can adopt an assembly type or a welding type, and is selected by the site according to the actual situation. The temporary supporting component 1 is arranged in the middle of the butt joint position of the sectional hoisting piece 21, and two temporary positioning supporting points are ensured to exist when each section of the sectional hoisting piece 21 is installed and positioned;
a welding operation platform is arranged on a supporting top plate at the subsection of the large-span steel beam truss structure; the roof truss support top is provided with a beam, and the truss structure is connected with the beam at the support top in sections through a positioning template.
The reliable connection of the support bottom to the beam top or column top of the main structure includes the following conditions:
1) the temporary support frame 11 is fixedly welded with the embedded part arranged on the top of the concrete column or the top of the beam;
2) the temporary support frame 11 is positioned on the top of the steel column or the top of the steel beam and is welded and fixed with the steel column or the steel beam through the conversion beam;
3) and when the concrete is positioned at the opening, a conversion steel beam is made, the conversion beam is welded with a lower main body structural steel beam or a steel column, and an embedded part conversion beam is reserved at the top of the concrete and welded and fixed with an embedded part in a concrete structure at the lower part.
In this embodiment, the bottom of the temporary support frame 11 is reliably connected with the floor structural steel beam through the conversion steel beam.
3.3 truss installation
The roof truss can be divided into a plurality of subareas according to the arrangement of the tower crane
The installation sequence is symmetrically performed from the middle to the south and north, the installation of the embedded rod 22 is performed after the sectional hoisting piece 21 is hoisted, and finally the installation of the single-layer structure is performed.
Positioning and adjusting a truss structure: the truss is spatially positioned through a total station, three truss positioning points are selected, one is taken from the two ends of the upper chord, one is taken from the upper flange of the lower chord, the positioning points are arranged at the central positions 100mm away from the end ports, and the positioning points are knocked on the members by ocean impacts after the truss is assembled. And the total station is assisted by a small prism for measurement during positioning.
And when the main chord of the truss is positioned, if the main chord has a misalignment phenomenon, fine adjustment is carried out by adopting the jack 3. The jack 3 is arranged at the top end of the support steel beam 12 and is adjacent to the bearing part 13.
3.2 truss structure installation butt joint process: before the sectional hoisting piece 21 is hoisted, a total station instrument is firstly adopted to measure and install the positioning template, after the L-shaped truss is hoisted on the temporary supporting component 1, after the repeated measurement is correct, the limiting template is welded under the condition that the crane does not loosen the hook, and meanwhile, the chord member and the positioning template are fixed in a spot welding mode. And then installing an embedded rod 22 between the two sectional hoisting pieces 21, and paving a steel springboard on the horizontal section of the truss as a construction channel during construction.
S4, unloading the temporary support assembly 1 after the truss structure is assembled
4.1 principle of unloading
The construction of unloading of structure is started after the construction, installation and welding of the steel structure are completed and acceptance is qualified. The structure unloading is a process of converting the truss structure from a supporting stress state to a free stress state, namely, the truss structure is smoothly transited from a construction installation state to a design state on the premise of ensuring the whole stress safety of the conventional temporary supporting component 1.
The offload scheme is implemented following the principles of "zoning, staging, equalization, slowness".
4.2 unloading sequence
And unloading the temporary support assembly 1 of the truss structure synchronously and symmetrically from the middle to the east and west sides during unloading. When the truss structure does not generate displacement, the lower end faces of the truss structure are in the same horizontal plane.
4.3 unloading measures
The unloading operation is mainly carried out by cutting off the pressure bearing part 13 in the temporary support assembly 1, and the height of each cutting off is controlled according to the unloading displacement amount of the support position until the truss structure does not generate downward displacement after the cutting off of a certain step is finished. And then the bearing parts 13, the support steel beams 12 and the temporary support frames 11 are respectively removed. The cutting amount of each cutting operation is controlled to be 5-10 mm.
In this embodiment, the pressure-bearing part 13 includes a connecting pipe, one end of the connecting pipe is provided with a clamping groove for clamping with the truss structure, and the other end is fixedly connected with the supporting steel beam 12; the cutting operation is used to increase the depth of the card slot.
During the process of unloading the temporary support assembly 1, the displacement of the deformation control point is monitored, and if a large deviation occurs, the displacement is stopped immediately, and the reason is checked and eliminated by each relevant unit, and then the operation can be continued.
S5, welding the truss structure
This engineering member is more, for convenient operation and improvement installation effectiveness, adopts the cage as operation platform during the welding, and the cage passes through the couple and is connected with truss structure roof beam body.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A construction method of a large-span roof truss is characterized by comprising the following steps:
s1, determining the position of the temporary support frame; segmenting the truss into a plurality of segments of hoisting pieces and a plurality of embedding rods, and then determining the hoisting sequence and hoisting route of each segment of the segment hoisting pieces;
s2, mounting the temporary support assembly on the floor structural steel beam; mounting a plurality of pressure bearing members on the temporary support assembly;
s3, sequentially hoisting the sectional hoisting pieces and the embedding rods on the pressure-bearing pieces respectively, and splicing in high altitude;
s4, after the truss structure is assembled, disassembling the temporary support assembly;
s5, welding the truss structure;
step S4 includes the following steps:
s4.1, cutting off the pressure-bearing part, and controlling the cutting height of each time according to the unloading displacement amount of the supporting position until the truss structure does not generate downward displacement after a certain cutting off is finished; and then respectively dismantling the pressure-bearing part, the support steel beam and the temporary support frame.
2. The construction method of a large-span roof truss as claimed in claim 1, wherein the step S2 includes the steps of:
s2.1, respectively installing a plurality of temporary support frames on the floor structural steel beams;
s2.2, mounting a plurality of rows of support steel beams on a working surface formed by the tops of the temporary support frames;
and S2.3, mounting a plurality of pressure-bearing parts for supporting the truss structure at the top end of each row of the supporting steel beam.
3. A method of constructing a large span roof truss as claimed in claim 1 wherein: the pressure-bearing part comprises a connecting pipe, one end of the connecting pipe is provided with a clamping groove used for being clamped with the truss structure, and the other end of the connecting pipe is fixedly connected with the supporting steel beam; the cutting operation is used for increasing the depth of the clamping groove.
4. A method of constructing a large span roof truss as defined in any one of claims 1-3 wherein: the height of each cutting is controlled to be 5-10 mm.
5. The construction method of a large-span roof truss as claimed in claim 1, wherein the step S3 includes the steps of:
s3.1, construction of a single-row truss structure: firstly, mounting a certain section of sectional hoisting piece on a supporting working surface formed by a plurality of pressure-bearing pieces; then sequentially installing a plurality of hoisting subsections at two ends of the subsection hoisting piece to form a row of truss structure;
s3.2, arranging a plurality of rows of structures obtained in the S3.1 on the supporting working surface at intervals until the supporting working surface is fully paved;
s3.3, installing the embedded rods between the adjacent single-row truss structures;
s3.4, sequentially installing the rest roof truss structures;
s3.5, installing the embedding rod in the middle position;
and S3.6, installing a single-layer structural part.
6. A method of constructing a large span roof truss as claimed in claim 1 wherein: each row of the supporting steel beams is composed of a plurality of branch supporting beams connected end to end.
7. A method of constructing a large span roof truss as claimed in claim 1 wherein: the temporary support frame is connected with the floor structure steel beam through the conversion steel beam.
8. A method of constructing a large span roof truss as claimed in claim 1 wherein: the displacement amount of the deformation control point is monitored in step S5.
9. A method of constructing a large span roof truss as claimed in claim 1 wherein: when the truss structure does not generate displacement, the lower end faces of the truss structure are in the same horizontal plane.
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| CN201911312641.XA CN111042543A (en) | 2019-12-18 | 2019-12-18 | Large-span roof truss construction method |
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| CN112411759A (en) * | 2020-10-28 | 2021-02-26 | 上海二十冶建设有限公司 | Non-full-cloth support large-span steel structure high-altitude bulk accurate assembly method |
| CN112482578A (en) * | 2020-12-14 | 2021-03-12 | 北京市机械施工集团有限公司 | Long-span conversion truss adopting temporary support and construction method thereof |
| CN113152909A (en) * | 2021-03-05 | 2021-07-23 | 河北省送变电有限公司 | Positioning device for assembly type building foundation and operation method thereof |
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| CN112411759A (en) * | 2020-10-28 | 2021-02-26 | 上海二十冶建设有限公司 | Non-full-cloth support large-span steel structure high-altitude bulk accurate assembly method |
| CN112482578A (en) * | 2020-12-14 | 2021-03-12 | 北京市机械施工集团有限公司 | Long-span conversion truss adopting temporary support and construction method thereof |
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Application publication date: 20200421 |