CN109972845B - Method for mounting steel roof truss - Google Patents
Method for mounting steel roof truss Download PDFInfo
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- CN109972845B CN109972845B CN201910289172.8A CN201910289172A CN109972845B CN 109972845 B CN109972845 B CN 109972845B CN 201910289172 A CN201910289172 A CN 201910289172A CN 109972845 B CN109972845 B CN 109972845B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 463
- 239000010959 steel Substances 0.000 title claims abstract description 463
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000000725 suspension Substances 0.000 claims abstract description 93
- 238000003466 welding Methods 0.000 claims abstract description 42
- 238000004519 manufacturing process Methods 0.000 claims abstract description 4
- 238000009434 installation Methods 0.000 abstract description 40
- 238000010276 construction Methods 0.000 abstract description 17
- 238000009435 building construction Methods 0.000 abstract description 2
- 238000009659 non-destructive testing Methods 0.000 abstract description 2
- 238000011900 installation process Methods 0.000 description 3
- 210000001503 joint Anatomy 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000000694 effects Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
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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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Abstract
The invention relates to the technical field of building construction, and provides a method for installing a steel roof truss, which comprises the following steps of firstly manufacturing the steel roof truss in sections, then erecting full space supports, and then respectively hoisting the left section of the steel roof truss and the right section of the steel roof truss to installation positions for installation; then installing a suspension steel cable auxiliary device; then, hoisting the middle section of the steel roof truss to an installation position for installation; and then welding the assembly position of the steel roof truss, and carrying out nondestructive testing after welding. According to the installation method of the steel roof truss, under the condition that large hoisting equipment is lacked in a construction site, the steel roof truss is hoisted in place in sections and then assembled, the weight of each hoisting is reduced, the steel roof truss can be hoisted by adopting small hoisting equipment, and the site construction progress is guaranteed.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to an installation method of a steel roof truss.
Background
The invention has application number 201710373251.8, is named as an invention patent of an installation method of a steel roof truss, and the technical scheme thereof discloses the following contents: assembling the steel roof truss on the ground; and lifting the assembled steel roof truss to a mounting position integrally, and fixing the steel roof truss on the mounting position. In the installation method of the steel roof truss, the steel roof truss is assembled on the ground, although the steps of high-altitude operation can be reduced, and the assembly quality of the steel roof truss is improved; however, this method of installation requires a large crane for the fitting operation. When no large crane is arranged on the construction site, or no space for parking the large crane and no access road are arranged on the construction site, only a small crane or a tower crane is adopted to hoist the steel roof truss. And because the maximum hoisting weight of the small crane or the tower crane is far less than the weight of the steel roof truss, the steel roof truss cannot be integrally installed by adopting the installation mode.
In order to install the steel roof truss by using a small crane or a tower crane, the steel roof truss is generally manufactured in sections, hoisted in place in sections and assembled. In the method, a full support is required to be arranged below the installation position of the steel roof truss, the full support is used for bearing the weight of the steel roof truss and is used as an operation platform for constructors, and the load borne by the full support is gradually increased along with the positioning of each section of the steel roof truss. When the erection width of the full-space support is small and the erection height is high, the full-space support can have the phenomenon of insufficient stability along with the hoisting of each section of the steel roof truss, and the full-space support can collapse in serious cases, so that serious safety accidents are caused. At present, in order to improve the stability of full hall support, the mode of adoption is for increasing the width of setting up of full hall support, increases the quantity of horizontal pole, pole setting etc. in the full hall support unit volume. However, this method has the following disadvantages: 1. the erection period is long, the erection workload is large, and the construction cost is high; 2. the wider full-space support is erected to occupy the standing space of the small crane, so that the hoisting radius of the crane is reduced, and the hoisting difficulty is increased.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: provided is a method for installing a steel roof truss, which can install the steel roof truss under the condition that large hoisting equipment is lacked in a construction site.
The technical scheme adopted by the invention for solving the technical problems is as follows: the installation method of the steel roof truss comprises the following steps,
s1, dividing the steel roof truss into a left steel roof truss section, a middle steel roof truss section and a right steel roof truss section along the length direction according to the design drawing of the steel roof truss, and then manufacturing the steel roof truss in a segmented manner;
s2, erecting a full hall bracket between the left supporting frame and the right supporting frame;
s3, hoisting the left section of the steel roof truss to a mounting position by adopting hoisting equipment, mounting the outer end of the left section of the steel roof truss on the top of a left support frame, supporting the left section of the steel roof truss by using a full-space support, and then loosening a hook of the hoisting equipment;
s4, hoisting the right section of the steel roof truss to a mounting position by adopting hoisting equipment, mounting the outer end of the right section of the steel roof truss at the top of the right support frame, supporting the right section of the steel roof truss by the full-space support, and then loosening the hook of the hoisting equipment;
s5, mounting a left upright post at the outer end of the left section of the steel roof truss or the top of the left support frame, and mounting a right upright post at the outer end of the right section of the steel roof truss or the top of the right support frame; at least one suspension steel cable is supported on the left upright post and the right upright post, and two ends of the suspension steel cable are respectively fixed on the left supporting frame and the right supporting frame in an inclined downward manner;
s6, connecting the upper end of the left sling with the suspension steel cable, and connecting the lower end of the left sling with the left section of the steel roof truss; connecting the upper end of a right sling with a suspension steel cable, and connecting the lower end of the right sling with the right section of the steel roof truss;
s7, hoisting the middle section of the steel roof truss to a mounting position by adopting hoisting equipment, connecting the upper end of the middle sling with the suspension steel cable, and connecting the lower end of the middle sling with the middle section of the steel roof truss; then welding and fixing the middle section of the steel roof truss with the left section of the steel roof truss and the right section of the steel roof truss intermittently, and then loosening a hook of hoisting equipment;
s8, after the steel roof truss is spliced and accepted, performing full welding on the splicing position of the steel roof truss; then, the welding quality of the welding seam is checked; if not, re-welding until the welding quality of the welding seam meets the design requirement;
s9, after all the steel roof trusses are installed, connecting upper and lower chord horizontal supporting beams between the steel roof trusses and gable walls; the auxiliary device is then removed.
Further, in step S1, dividing the left section of the steel roof truss into a lower left section of the steel roof truss and an upper left section of the steel roof truss above the lower left section of the steel roof truss according to the design drawing of the steel roof truss;
in step S3, the step of installing the left section of the steel roof truss is,
s3.1, hoisting the lower left section of the steel roof truss to a mounting position by adopting hoisting equipment, mounting the outer end of the lower left section of the steel roof truss on the top of a left support frame, supporting the lower left section of the steel roof truss by using a full-space support, and then loosening a hook by using the hoisting equipment;
s3.2, mounting a left counterweight beam at the outer end of the lower left section of the steel roof truss, forming a gap between the left counterweight beam and the top of the left support frame, and mounting a left counterweight block on the left counterweight beam; the distance between the left balancing weight and the outer end of the lower left section of the steel roof truss is L1, and the height between the bottom of the left balancing weight and the top of the left supporting frame is H1;
and S3.3, hoisting the upper left section of the steel roof truss to a mounting position by adopting hoisting equipment, then intermittently welding and fixing the lower left section of the steel roof truss and the upper left section of the steel roof truss, and then loosening the hook by the hoisting equipment.
Further, in step S6, each of the suspension cables is provided with at least two left suspension cables, a lower end of at least one left suspension cable is connected to the lower left section of the steel roof truss, and a lower end of at least one left suspension cable is connected to the upper left section of the steel roof truss.
Further, in step S1, dividing the right section of the steel roof truss into a lower right section of the steel roof truss and an upper right section of the steel roof truss above the lower right section of the steel roof truss according to the design drawing of the steel roof truss;
in step S4, the step of installing the right section of the steel roof truss is,
s4.1, hoisting the lower right section of the steel roof truss to a mounting position by adopting hoisting equipment, mounting the outer end of the lower right section of the steel roof truss at the top of a right support frame, supporting the lower right section of the steel roof truss by using a full-space support, and then loosening a hook by using the hoisting equipment;
s4.2, mounting a right counterweight beam at the outer end of the lower right section of the steel roof truss, forming a gap between the right counterweight beam and the top of the right support frame, and mounting a right counterweight block on the right counterweight beam; the distance between the right counterweight block and the outer end of the lower right section of the steel roof truss is L2, and the height between the bottom of the right counterweight block and the top of the right support frame is H2;
and S4.3, hoisting the upper right section of the steel roof truss to a mounting position by adopting hoisting equipment, then intermittently welding and fixing the lower right section of the steel roof truss and the upper right section of the steel roof truss, and then loosening the hook by using the hoisting equipment.
Further, in step S6, each suspension cable is provided with at least two right suspension cables, a lower end of at least one right suspension cable is connected to the lower right section of the steel roof truss, and a lower end of at least one right suspension cable is connected to the upper right section of the steel roof truss.
Further, in step S1, dividing the steel roof truss middle section into a steel roof truss lower middle section and a steel roof truss upper middle section located above the steel roof truss lower middle section according to the design drawing of the steel roof truss;
in step S7, the step of installing the middle section of the steel roof truss is,
s7.1, hoisting the lower middle section of the steel roof truss to a mounting position by adopting hoisting equipment, connecting the upper end of a middle sling with a suspension steel cable, and connecting the lower end of the middle sling with the lower middle section of the steel roof truss; welding and fixing the lower middle section of the steel roof truss with the left section of the steel roof truss and the right section of the steel roof truss intermittently, and then loosening a hook of hoisting equipment;
s7.2, hoisting the upper middle section of the steel roof truss to a mounting position by adopting hoisting equipment, welding and fixing the upper middle section of the steel roof truss and the lower middle section of the steel roof truss in a discontinuous mode, then welding and fixing the upper middle section of the steel roof truss and the left section of the steel roof truss and the right section of the steel roof truss in a discontinuous mode respectively, and then loosening the hook by adopting the hoisting equipment.
Further, in step S5, a left saddle is disposed on the top of the left upright, and a left arc-shaped groove matched with the suspension cable is disposed on the left saddle; the top of the right upright post is provided with a right saddle, and the right saddle is provided with a right arc-shaped groove matched with the suspension steel cable; the suspension steel cable is respectively supported in the left arc-shaped groove of the left saddle and the right arc-shaped groove of the right saddle.
Further, in step S5, the number of the suspension wires is two, and the distance between the two suspension wires is greater than the width of the steel roof truss.
The invention has the beneficial effects that: according to the installation method of the steel roof truss, under the condition that large hoisting equipment is lacked in a construction site, the steel roof truss is hoisted in place in sections and then assembled, the weight of each hoisting is reduced, the steel roof truss can be hoisted by adopting small hoisting equipment, and the site construction progress is guaranteed. Through setting up in midair cable wire and balancing weight, in the installation of steel roof truss, make full hall support bear the load incessantly, reduce the load that full hall support bore and the time of bearing the load, and then make full hall support's stability obtain guaranteeing, improved the security of construction.
Drawings
FIG. 1 is a schematic structural view of a first embodiment of a steel roof truss of the present invention;
FIG. 2 is a schematic structural view of the left section of steel roof truss and the right section of steel roof truss of FIG. 1 mounted on a support frame;
FIG. 3 is a schematic illustration of the structure of FIG. 2 after installation of the suspension wires and the steel roof truss mid-section;
FIG. 4 is a schematic view of the auxiliary device shown in FIG. 3 with the auxiliary device removed;
FIG. 5 is a schematic structural view of a second embodiment of a steel roof truss of the present invention;
FIG. 6 is a schematic structural view of the lower left section of the steel roof truss and the lower right section of the steel roof truss of FIG. 5 mounted on a support frame;
FIG. 7 is a schematic structural view of the counterweight and the left section of the steel roof truss and the right section of the steel roof truss in FIG. 6;
FIG. 8 is a schematic illustration of the structure of FIG. 7 after installation of the suspension cables;
FIG. 9 is a schematic view of the lower mid-section of the steel roof truss of FIG. 8 after installation;
FIG. 10 is a schematic illustration of the steel roof truss of FIG. 9 after installation of the upper mid-section thereof;
fig. 11 is a schematic structural view of the auxiliary device in fig. 10 removed.
The reference numbers in the figures are: 1-left support frame, 2-right support frame, 3-full hall brace, 4-left upright, 5-right upright, 6-suspension wire rope, 7-left sling, 8-right sling, 9-middle sling, 10-left counterweight beam, 11-left counterweight, 12-right counterweight beam, 13-right counterweight, 30-steel roof truss, 31-steel roof truss left section, 32-steel roof truss middle section, 33-steel roof truss right section, 311-steel roof truss lower left section, 312-steel roof truss upper left section, 321-steel roof truss lower middle section, 322-steel roof truss upper middle section, 331-steel roof truss lower right section, 332-steel roof truss upper right section.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
The installation method of the steel roof truss comprises the following steps,
s1, dividing the steel roof truss 30 into a left steel roof truss section 31, a middle steel roof truss section 32 and a right steel roof truss section 33 along the length direction according to the design drawing of the steel roof truss 30, and then manufacturing the steel roof truss 30 in a segmented manner;
s2, erecting a full hall bracket 3 between the left supporting frame 1 and the right supporting frame 2;
s3, hoisting the left steel roof truss section 31 to a mounting position by adopting hoisting equipment, mounting the outer end of the left steel roof truss section 31 on the top of the left support frame 1, supporting the left steel roof truss section 31 by the full-space support 3, and then loosening the hook of the hoisting equipment;
s4, hoisting the right steel roof truss section 33 to a mounting position by adopting hoisting equipment, mounting the outer end of the right steel roof truss section 33 at the top of the right support frame 2, supporting the right steel roof truss section 33 by the full support 3, and then loosening the hook of the hoisting equipment;
s5, installing a left upright post 4 at the outer end of the left steel roof truss section 31 or the top of the left support frame 1, and installing a right upright post 5 at the outer end of the right steel roof truss section 33 or the top of the right support frame 2; at least one suspension steel cable 6 is supported on the left upright post 4 and the right upright post 5, and two ends of the suspension steel cable 6 are respectively fixed on the left supporting frame 1 and the right supporting frame 2 in an inclined downward way;
s6, connecting the upper end of the left sling 7 with the suspension steel cable 6, and connecting the lower end of the left sling 7 with the left section 31 of the steel roof truss; the upper end of a right sling 8 is connected with a suspension steel cable 6, and the lower end of the right sling 8 is connected with a right section 33 of the steel roof truss;
s7, hoisting the steel roof truss middle section 32 to an installation position by adopting hoisting equipment, connecting the upper end of a middle sling 9 with the suspension steel cable 6, and connecting the lower end of the middle sling 9 with the steel roof truss middle section 32; then, the steel roof truss middle section 32 is welded and fixed with the steel roof truss left section 31 and the steel roof truss right section 33 discontinuously, and then hoisting equipment is hooked loosely;
s8, after the steel roof truss 30 is spliced and accepted, performing full welding on the splicing position of the steel roof truss 30; then, the welding quality is checked; if not, re-welding until the welding quality meets the design requirement;
s9, after all the steel roof trusses 30 are installed, connecting upper and lower chord horizontal supporting beams between the steel roof trusses 30 and between the steel roof trusses 30 and a gable wall; the auxiliary device is then removed.
In step S1, the steel roof truss 30 is divided into a left steel roof truss section 31, a middle steel roof truss section 32, and a right steel roof truss section 33 along the length direction according to the design drawing of the steel roof truss 30, and then the steel roof truss 30 is manufactured in segments. As shown in fig. 1, the steel roof truss 30 is divided into three sections along the length direction, and the weight of each section should be smaller than the rated hoisting weight of the hoisting equipment on the construction site, so that each section of the steel roof truss 30 can be hoisted to the installation position by the hoisting equipment on the construction site for installation. In order to ensure the machining precision and the installation size of the steel roof truss 30, the sections are pre-assembled after being manufactured, and the assembling butt joint is marked. When the splicing operation is carried out at high altitude, only the mark at the splicing butt joint part needs to be aligned, so that the splicing efficiency during the high altitude operation is improved, the time of the high altitude operation is reduced, and the safety risk of the high altitude operation is reduced.
In step S2, the full hall brace 3 is set up between the left support frame 1 and the right support frame 2. As shown in fig. 2, the left support frame 1 and the right support frame 2 are arranged oppositely, and they mainly play a supporting role, after the steel roof truss 30 is installed, one end of the steel roof truss 30 is supported on the left support frame 1, and the other end is supported on the right support frame 2. The full hall bracket 3 is a supporting structure and mainly comprises upright rods, cross rods, inclined struts, scissor struts and the like; wooden gangplank can be paved to full hall support 3's top, sets up interim railing around, plays the effect of operation platform and passageway.
In step S3, the left steel roof truss section 31 is installed, as shown in fig. 2, after the left steel roof truss section 31 is lifted to the installation position by the hoisting device, the center line, the elevation and the camber of the left steel roof truss section 31 are adjusted, then the support cushion block is arranged between the left steel roof truss section 31 and the full support 3 to support the left steel roof truss section 31, and after the outer end of the left steel roof truss section 31 is installed on the top of the left support frame 1, the hoisting device can be hooked loosely. Hoisting equipment can be for small-size crane or tower crane etc., that the one end on left braced frame 1 is installed to the outer end of steel roof truss left side section 31 finger, and that one end on full hall support 3 is supported to the inner finger of steel roof truss left side section 31. After the hoisting equipment is unhooked, the full support 3 mainly bears the weight of the left section 31 of the steel roof truss.
In step S4, the right steel roof truss section 33 is installed, as shown in fig. 2, after the right steel roof truss section 33 is lifted to the installation position by the hoisting device, the center line, the elevation and the camber of the right steel roof truss section 33 are adjusted, then the support cushion block is arranged between the right steel roof truss section 33 and the full support 3 to support the right steel roof truss section 33, and after the outer end of the right steel roof truss section 33 is installed on the top of the right support frame 2, the hoisting device can be hooked loosely. The outer end of the right steel roof truss section 33 refers to the end mounted on the right support frame 2, and the inner end of the right steel roof truss section 33 refers to the end supported on the full support frame 3. After the hoisting equipment is unhooked, the full support 3 mainly bears the weight of the right section 33 of the steel roof truss.
In step S5, the suspension wire rope structure is installed, and as shown in fig. 3, the lower end of the left upright post 4 is installed on the outer end of the left section 31 of the steel roof truss or the left support frame 1, and the lower end of the right upright post 5 is installed on the outer end of the right section 33 of the steel roof truss or the right support frame 2. As a preferred scheme, the left upright post 4 is arranged at the top of the outer end of the left section 31 of the steel roof truss, and the lower end of the left upright post 4 is connected with the left section 31 of the steel roof truss through a high-strength bolt structure; the right upright post 5 is arranged at the top of the outer end of the right steel roof truss section 33, and the lower end of the right upright post 5 is connected with the right steel roof truss section 33 through a high-strength bolt structure. At least one suspension steel cable 6 is supported on the left upright post 4 and the right upright post 5, the left end of the suspension steel cable 6 is obliquely downwards fixed on the left supporting frame 1, and the right end of the suspension steel cable 6 is obliquely downwards fixed on the right supporting frame 2.
In step S6, the weights of the left steel roof truss section 31 and the right steel roof truss section 33 are carried by the suspension wires 6. As shown in fig. 3, the upper end of the left sling 7 is connected to the suspension wire 6, the left sling 7 is vertically disposed, the lower end of the left sling 7 is connected to the left section 31 of the steel roof truss, and the left sling 7 is in a tensioned state, and the number of the left slings 7 may be one or more. The upper end of a right sling 8 is connected with a suspension steel cable 6, the right sling 8 is vertically arranged, the lower end of the right sling 8 is connected with a right section 33 of the steel roof truss and enables the right sling 8 to be in a tensioned state, and the number of the right sling 8 can be one or multiple. According to actual conditions, the tensioning conditions of the left sling 7 and the right zipper 8 are adjusted, so that the suspension steel cable 6 mainly bears the weight of the left steel roof truss section 31 and the right steel roof truss section 33, the weight required to be borne by the full-space support 3 is reduced, the stability of the full-space support 3 is guaranteed, and the safety of high-altitude construction is improved.
In step S7, the steel roof truss middle section 32 is installed, as shown in fig. 3, after the steel roof truss middle section 32 is lifted to the installation position by using a lifting device, the center line, the elevation and the camber of the steel roof truss middle section 32 are adjusted, the upper end of the middle suspension cable 9 is connected with the suspension steel cable 6, the middle suspension cable 9 is vertically arranged, the lower end of the middle suspension cable 9 is connected with the steel roof truss middle section 32, and the middle suspension cable 9 is in a tensioned state, wherein the number of the middle suspension cables 9 may be one or multiple. After being interrupted welded and fixed with steel roof truss left side section 31 and steel roof truss right side section 33 respectively with steel roof truss middle section 32, lifting device unhook, suspend in midair the weight that steel cable 6 mainly bore steel roof truss middle section 32 this moment, and then reduce the required weight that bears of full hall support 3, make full hall support 3's stability obtain guaranteeing, improved the security of high altitude construction.
In step S8, after the steel roof truss 30 is assembled and accepted, the assembled position of the steel roof truss 30 is fully welded, preferably, the steel roof truss 30 is symmetrically welded from the middle to both ends of the steel roof truss 30, so as to reduce the deformation of the steel roof truss 30 during welding. And after welding, carrying out nondestructive testing on the welding quality of the welding seam, and if the welding quality is not qualified, re-welding until the welding quality of the welding seam meets the design requirement.
In step S9, after all the steel roof trusses 30 are installed according to the above steps, each steel roof truss 30 is in a simply supported crossing state, and then the upper and lower chord horizontal support beams between the steel roof trusses 30 and between the steel roof trusses 30 and the gable walls are connected, so that all the steel roof trusses 30 are connected into a whole, and the stability of the steel roof trusses 30 is improved. The auxiliary device is then removed and the installation of the steel roof truss 30 is completed as shown in fig. 4. The auxiliary device refers to a device for assisting the installation of the steel roof truss 30, and comprises a full support 3, a left upright post 4, a right upright post 5, a suspension steel cable 6, a left sling 7, a right sling 8, a middle sling 9 and the like.
According to the installation method of the steel roof truss 30, under the condition that large hoisting equipment is lacked in a construction site, the steel roof truss 30 is hoisted in place in sections and then assembled, the weight of each hoisting is reduced, the steel roof truss 30 can be installed by adopting small hoisting equipment, and the site construction progress is guaranteed. The stability of the full stand 3 is related to the height of the full stand 3, the higher the full stand 3 is, the worse its stability is. In the installation process of the steel roof truss 30, when the height of the full support 3 is higher, in order to ensure the stability of the steel roof truss 30 during installation and the safety of construction personnel working high above the ground, the full support 3 is enabled to continuously bear load by arranging the suspension steel cable 6 and the suspension rope, the load borne by the full support 3 and the time for bearing the load are reduced, the stability of the full support 3 is further ensured, and the safety of construction is improved.
In order to minimise the hoisting weight of the hoisting device per hoisting, fig. 5 shows a second embodiment of a steel roof truss 30 segment. As shown in fig. 5, in step S1, the left steel roof truss section 31 is divided into a lower left steel roof truss section 311 and an upper left steel roof truss section 312 located above the lower left steel roof truss section 311 according to the design drawing of the steel roof truss 30; dividing the right steel roof truss section 33 into a lower right steel roof truss section 331 and an upper right steel roof truss section 332 above the lower right steel roof truss section 331 according to the design drawing of the steel roof truss 30; the steel roof truss middle section 32 is divided into a steel roof truss lower middle section 321 and a steel roof truss upper middle section 322 located above the steel roof truss lower middle section 321 according to the design drawing of the steel roof truss 30.
In step S3, the left section 31 of the steel roof truss is installed by,
s3.1, hoisting the lower left section 311 of the steel roof truss to a mounting position by adopting hoisting equipment, mounting the outer end of the lower left section 311 of the steel roof truss on the top of the left support frame 1, enabling the full-space support 3 to support the lower left section 311 of the steel roof truss, and then loosening the hook of the hoisting equipment;
s3.2, installing the left counterweight beam 10 at the outer end of the lower left section 311 of the steel roof truss, forming a gap between the left counterweight beam 10 and the top of the left support frame 1, and installing the left counterweight block 11 on the left counterweight beam 10; the distance between the left counterweight 11 and the outer end of the lower left section 311 of the steel roof truss is L1, and the height between the bottom of the left counterweight 11 and the top of the left support frame 1 is H1;
and S3.3, hoisting the upper left section 312 of the steel roof truss to a mounting position by adopting hoisting equipment, then welding and fixing the lower left section 311 of the steel roof truss and the upper left section 312 of the steel roof truss in a discontinuous mode, and then loosening the hook by using the hoisting equipment.
In step S3.1, the lower left section 311 of the steel roof truss is installed. As shown in fig. 6, the lower left section 311 of the steel roof truss is lifted to the installation position by using a lifting device, the center line, elevation and camber of the lower left section 311 of the steel roof truss are adjusted, then a supporting cushion block is arranged between the lower left section 311 of the steel roof truss and the full-space support 3 to support the lower left section 311 of the steel roof truss, the outer end of the lower left section 311 of the steel roof truss is installed at the top of the left supporting frame 1, the lifting device can be hooked loosely, and at this moment, the full-space support 3 mainly bears the weight of the lower left section 311 of the steel roof truss.
In the step S3.2, a left balance weight device is provided, as shown in fig. 7, the left balance weight beam 10 is installed at the outer end of the lower left section 311 of the steel roof truss through a high-strength bolt structure, and a gap is formed between the left balance weight beam 10 and the top of the left support frame 1, the gap ensures that the left balance weight beam 10 is in a suspended state, the left balance weight block 11 is installed on the left balance weight beam 10, and the left balance weight block 11 is suspended; preferably, the height between the bottom of the left balancing weight 11 and the top of the left supporting frame 1 is H1 being more than or equal to 100mm, so as to ensure that the left balancing weight 11 is always in a suspended state in the whole installation process. Through setting up left counter weight roof beam 10 and left balancing weight 11 to the steel roof truss is left section 311 down and left braced frame 1's hookup location is the fulcrum, makes steel roof truss left section 311 down be cantilever balance form, and then reduces full hall support 3 and need bear the weight of steel roof truss left section 311 down, at this moment, just can be through the weight that increases left balancing weight 11, make full hall support 3 bear the weight of steel roof truss left section 311 as far as possible, make full hall support 3's stability obtain guaranteeing.
In step S3.3, the upper left section 312 of the steel roof truss is installed, as shown in fig. 7, the upper left section 312 of the steel roof truss is lifted to an installation position by using a lifting device, the center line, the elevation and the camber of the upper left section 312 of the steel roof truss are adjusted, then the lower left section 311 of the steel roof truss and the upper left section 312 of the steel roof truss are welded and fixed intermittently, and then the lifting device is unhooked, so that the installation of the left section 31 of the steel roof truss is completed.
In step S6, a plurality of left suspension ropes 7 may be provided for each suspension wire 6, and the lower ends of the plurality of left suspension ropes 7 may be connected to the lower left section 311 of the steel roof truss or may be connected to the upper left section 312 of the steel roof truss. Preferably, as shown in fig. 8, in step S6, each of the suspension wires 6 is provided with at least two left suspension cables 7, the lower end of at least one left suspension cable 7 is connected to the lower left section 311 of the steel roof truss, and the lower end of at least one left suspension cable 7 is connected to the upper left section 312 of the steel roof truss.
In step S4, the right steel roof truss section 33 is installed by,
s4.1, hoisting the lower right steel roof truss section 331 to a mounting position by using hoisting equipment, mounting the outer end of the lower right steel roof truss section 331 at the top of the right support frame 2, enabling the full support 3 to support the lower right steel roof truss section 331, and then loosening the hook of the hoisting equipment;
s4.2, installing the right counterweight beam 12 at the outer end of the lower right section 331 of the steel roof truss, forming a gap between the right counterweight beam 12 and the top of the right support frame 2, and installing the right counterweight 13 on the right counterweight beam 12; the distance between the right counterweight 13 and the outer end of the lower right section 331 of the steel roof truss is L2, and the height between the bottom of the right counterweight 13 and the top of the right support frame 2 is H2;
and S4.3, hoisting the upper right section 332 of the steel roof truss to a mounting position by adopting hoisting equipment, then welding and fixing the lower right section 331 of the steel roof truss and the upper right section 332 of the steel roof truss in a discontinuous mode, and then loosening the hook by using the hoisting equipment.
In step S4.1, the lower right section 331 of the steel roof truss is installed, as shown in fig. 6, a hoisting device is used to hoist the lower right section 331 of the steel roof truss to an installation position, the center line, the elevation and the camber of the lower right section 331 of the steel roof truss are adjusted, then a support cushion block is arranged between the lower right section 331 of the steel roof truss and the full space support 3 to support the lower right section 331 of the steel roof truss, after the outer end of the lower right section 331 of the steel roof truss is installed on the top of the right support frame 2, the hoisting device can be hooked loosely, and at this time, the full space support 3 mainly bears the weight of the lower right section 331 of the steel roof truss.
In the step S4.2, a right balance weight device is provided, as shown in fig. 7, the right balance weight beam 12 is installed at the outer end of the right section 331 of the steel roof truss through a high-strength bolt structure, and a gap is formed between the right balance weight beam 12 and the top of the right support frame 2, the gap ensures that the right balance weight beam 12 is in a suspended state, the right balance weight block 13 is installed on the right balance weight beam 12, and the right balance weight block 13 is suspended; preferably, the height between the bottom of the right counterweight block 13 and the top of the right supporting frame 2 is H2 being more than or equal to 100mm, so as to ensure that the right counterweight block 13 is always in a suspended state in the whole installation process. Through setting up right counter weight beam 12 and right counter weight 13 to right section 331 is the fulcrum with the hookup location of right braced frame 2 under the steel roof truss, makes right section 331 be cantilever balanced form under the steel roof truss, and then reduces full hall support 3 and need bear the weight of right section 331 under the steel roof truss, and at this moment, just can be through the weight that increases right counter weight 13, makes full hall support 3 bear the weight of right section 331 under the steel roof truss as far as possible.
In step S4.3, the upper right section 332 of the steel roof truss is installed, as shown in fig. 7, the upper right section 332 of the steel roof truss is lifted to an installation position by using a lifting device, the center line, the elevation and the camber of the upper right section 332 of the steel roof truss are adjusted, then the lower right section 331 of the steel roof truss and the upper right section 332 of the steel roof truss are welded and fixed intermittently, and then the lifting device is unhooked, so that the installation of the right section 33 of the steel roof truss is completed.
In step S6, a plurality of right suspension wires 8 may be provided on each suspension wire 6, and the lower ends of the plurality of right suspension wires 8 may be connected to the lower right segment 331 of the steel roof truss or may be connected to the upper right segment 332 of the steel roof truss. Preferably, as shown in fig. 8, in step S6, each of the suspension cables 6 is provided with at least two right suspension cables 8, the lower end of at least one right suspension cable 8 is connected to the lower right section 331 of the steel roof truss, and the lower end of at least one right suspension cable 8 is connected to the upper right section 332 of the steel roof truss.
In step S7, the steel roof truss middle section 32 is installed by,
s7.1, hoisting the lower middle section 321 of the steel roof truss to a mounting position by adopting hoisting equipment, connecting the upper end of a middle sling 9 with a suspension steel cable 6, and connecting the lower end of the middle sling 9 with the lower middle section 321 of the steel roof truss; welding and fixing the lower middle section 321 of the steel roof truss with the left section 31 of the steel roof truss and the right section 33 of the steel roof truss discontinuously, and then loosening a hook of hoisting equipment;
s7.2, hoisting the upper middle section 322 of the steel roof truss to a mounting position by adopting hoisting equipment, intermittently welding and fixing the upper middle section 322 of the steel roof truss and the lower middle section 321 of the steel roof truss, then intermittently welding and fixing the upper middle section 322 of the steel roof truss with the left section 31 of the steel roof truss and the right section 33 of the steel roof truss respectively, and then loosening the hook by adopting the hoisting equipment.
In the step S7.1, the lower middle section 321 of the steel roof truss is installed, as shown in fig. 9, the lower middle section 321 of the steel roof truss is lifted to an installation position by using a lifting device, the center line, the elevation and the camber of the lower middle section 321 of the steel roof truss are adjusted, then the upper end of the middle sling 9 is connected with the suspension steel cable 6, the middle sling 9 is vertically arranged, the lower end of the middle sling 9 is connected with the lower middle section 321 of the steel roof truss, and the middle sling 9 is in a tensioned state; then, after the upper middle section 322 of the steel roof truss is welded and fixed with the left section 31 of the steel roof truss and the right section 33 of the steel roof truss discontinuously, the hoisting equipment can be hooked loosely, and at the moment, the suspension steel cable 6 mainly bears the weight of the lower middle section 321 of the steel roof truss.
In step S7.2, the upper middle section 322 of the steel roof truss is installed, as shown in fig. 10, the upper middle section 322 of the steel roof truss is hoisted to the installation position by using hoisting equipment, the center line, the elevation and the camber of the upper middle section 322 of the steel roof truss are adjusted, then the upper middle section 322 of the steel roof truss and the lower middle section 321 of the steel roof truss are welded and fixed discontinuously, then the upper middle section 322 of the steel roof truss is welded and fixed with the left section 31 of the steel roof truss and the right section 33 of the steel roof truss discontinuously, then the hoisting equipment is unhooked, the installation of the middle section 32 of the steel roof truss is completed, and at this time, the suspension steel cable 6 mainly bears the weight of the middle section.
Fig. 11 is a schematic structural diagram of the steel roof truss 30 in the above embodiment after installation and removal of the auxiliary devices, where the auxiliary devices include the full support 3, the left upright post 4, the right upright post 5, the suspension steel cable 6, the left sling 7, the right sling 8, the middle sling 9, the left counterweight beam 10, the left counterweight 11, the right counterweight beam 12, and the right counterweight 13.
In step S5, the left pillar 4 may be provided with a left positioning hole, the right pillar 5 may be provided with a right positioning hole, and the suspension cable 6 may be supported by the left positioning hole of the left pillar 4 and the right positioning hole of the right pillar 5. Preferably, in step S5, a left saddle is disposed on the top of the left upright 4, and a left arc-shaped groove matched with the suspension cable 6 is disposed on the left saddle; the top of the right upright post 5 is provided with a right saddle, and the right saddle is provided with a right arc-shaped groove matched with the suspension steel cable 6; the suspension steel cable 6 is respectively supported in the left arc-shaped groove of the left saddle and the right arc-shaped groove of the right saddle.
In step S5, the number of the suspension wires 6 is two, and the distance between the two suspension wires 6 is larger than the width of the steel roof truss 30. Two suspension steel cables 6 are arranged in parallel, so that the load borne by each suspension steel cable 6 is reduced, and the stability and the safety of the whole device are improved. By setting the distance between the two suspension steel cables 6 to be larger than the width of the steel roof truss 30, the left section 31 of the steel roof truss, the middle section 32 of the steel roof truss and the right section 33 of the steel roof truss can fall down from the space between the two suspension steel cables 6.
Claims (7)
1. A method of installing a steel roof truss characterised by the steps of,
s1, dividing the steel roof truss (30) into a left steel roof truss section (31), a middle steel roof truss section (32) and a right steel roof truss section (33) along the length direction according to the design drawing of the steel roof truss (30), and then manufacturing the steel roof truss (30) in a segmented manner;
s2, erecting a full hall bracket (3) between the left supporting frame (1) and the right supporting frame (2);
s3, hoisting the left steel roof truss section (31) to a mounting position by adopting hoisting equipment, mounting the outer end of the left steel roof truss section (31) at the top of the left support frame (1), supporting the left steel roof truss section (31) by the full-space support (3), and then loosening the hook of the hoisting equipment;
s4, hoisting the right steel roof truss section (33) to a mounting position by adopting hoisting equipment, mounting the outer end of the right steel roof truss section (33) at the top of the right support frame (2), supporting the right steel roof truss section (33) by the full-space support (3), and then loosening the hook of the hoisting equipment;
s5, installing a left upright post (4) at the outer end of the left steel roof truss section (31) or the top of the left support frame (1), and installing a right upright post (5) at the outer end of the right steel roof truss section (33) or the top of the right support frame (2); at least one suspension steel cable (6) is supported on the left upright post (4) and the right upright post (5), and two ends of the suspension steel cable (6) are respectively fixed on the left supporting frame (1) and the right supporting frame (2) in an inclined downward manner;
s6, connecting the upper end of a left sling (7) with a suspension steel cable (6), and connecting the lower end of the left sling (7) with the left section (31) of the steel roof truss; the upper end of a right sling (8) is connected with a suspension steel cable (6), and the lower end of the right sling (8) is connected with a right section (33) of the steel roof truss;
s7, hoisting the steel roof truss middle section (32) to a mounting position by adopting hoisting equipment, connecting the upper end of a middle sling (9) with a suspension steel cable (6), and connecting the lower end of the middle sling (9) with the steel roof truss middle section (32); then, the steel roof truss middle section (32) is respectively and discontinuously welded and fixed with the steel roof truss left section (31) and the steel roof truss right section (33), and then hoisting equipment is loosened;
s8, after the steel roof truss (30) is spliced and accepted, performing full welding on the splicing position of the steel roof truss (30); then, the welding quality of the welding seam is checked; if not, re-welding until the welding quality of the welding seam meets the design requirement;
s9, after all the steel roof trusses (30) are installed, connecting upper and lower chord horizontal supporting beams between the steel roof trusses (30) and between the steel roof trusses (30) and a gable wall; then the auxiliary device is dismantled;
in step S1, dividing the left steel roof truss section (31) into a lower left steel roof truss section (311) and an upper left steel roof truss section (312) above the lower left steel roof truss section (311) according to the design paper of the steel roof truss (30);
in step S3, the step of installing the left section (31) of the steel roof truss is that,
s3.1, hoisting the lower left section (311) of the steel roof truss to a mounting position by adopting hoisting equipment, mounting the outer end of the lower left section (311) of the steel roof truss on the top of a left supporting frame (1), enabling a full-space support (3) to support the lower left section (311) of the steel roof truss, and then loosening the hook of the hoisting equipment;
s3.2, installing a left counterweight beam (10) at the outer end of the lower left section (311) of the steel roof truss, forming a gap between the left counterweight beam (10) and the top of the left support frame (1), and installing a left counterweight (11) on the left counterweight beam (10); the distance between the left balancing weight (11) and the outer end of the lower left section (311) of the steel roof truss is L1, and the height between the bottom of the left balancing weight (11) and the top of the left supporting frame (1) is H1;
s3.3, hoisting the upper left section (312) of the steel roof truss to a mounting position by adopting hoisting equipment, then welding and fixing the lower left section (311) of the steel roof truss and the upper left section (312) of the steel roof truss discontinuously, and then loosening the hook by the hoisting equipment.
2. A method of installing a steel roof truss as characterised in claim 1 wherein in step S6, each suspension wire rope (6) is provided with at least two left suspension cables (7), the lower end of at least one left suspension cable (7) being connected to the lower left section (311) of the steel roof truss and the lower end of at least one left suspension cable (7) being connected to the upper left section (312) of the steel roof truss.
3. A method of installing a steel roof truss according to claim 1, wherein in step S1, the steel roof truss right section (33) is divided into a steel roof truss lower right section (331) and a steel roof truss upper right section (332) located above the steel roof truss lower right section (331) according to the design drawing of the steel roof truss (30);
in step S4, the right section (33) of the steel roof truss is mounted by the steps of,
s4.1, hoisting the lower right section (331) of the steel roof truss to a mounting position by adopting hoisting equipment, mounting the outer end of the lower right section (331) of the steel roof truss on the top of a right supporting frame (2), enabling a full-space support (3) to support the lower right section (331) of the steel roof truss, and then loosening the hook of the hoisting equipment;
s4.2, installing a right counterweight beam (12) at the outer end of the lower right section (331) of the steel roof truss, forming a gap between the right counterweight beam (12) and the top of the right support frame (2), and installing a right counterweight (13) on the right counterweight beam (12); the distance between the right counterweight (13) and the outer end of the lower right section (331) of the steel roof truss is L2, and the height between the bottom of the right counterweight (13) and the top of the right support frame (2) is H2;
and S4.3, hoisting the upper right section (332) of the steel roof truss to a mounting position by adopting hoisting equipment, then welding and fixing the lower right section (331) of the steel roof truss and the upper right section (332) of the steel roof truss discontinuously, and then loosening the hook by using the hoisting equipment.
4. A method of installing a steel roof truss as characterised in claim 3 wherein in step S6, each suspension wire rope (6) is provided with at least two right suspension cables (8), the lower end of at least one right suspension cable (8) being connected to the lower right section (331) of the steel roof truss and the lower end of at least one right suspension cable (8) being connected to the upper right section (332) of the steel roof truss.
5. A method of installing a steel roof truss according to claim 1, wherein in step S1, the steel roof truss middle section (32) is divided into a steel roof truss lower middle section (321) and a steel roof truss upper middle section (322) located above the steel roof truss lower middle section (321) according to the design drawing of the steel roof truss (30);
in step S7, the step of installing the steel roof truss middle section (32) is,
s7.1, hoisting the lower middle section (321) of the steel roof truss to a mounting position by adopting hoisting equipment, connecting the upper end of a middle sling (9) with a suspension steel cable (6), and connecting the lower end of the middle sling (9) with the lower middle section (321) of the steel roof truss; the lower middle section (321) of the steel roof truss is respectively fixed with the left section (31) of the steel roof truss and the right section (33) of the steel roof truss in a discontinuous welding mode, and then hoisting equipment is hooked loosely;
s7.2, hoisting the upper middle section (322) of the steel roof truss to a mounting position by adopting hoisting equipment, intermittently welding and fixing the upper middle section (322) of the steel roof truss and the lower middle section (321) of the steel roof truss, then intermittently welding and fixing the upper middle section (322) of the steel roof truss with the left section (31) of the steel roof truss and the right section (33) of the steel roof truss respectively, and then loosening the hook by adopting the hoisting equipment.
6. A method of mounting a steel roof truss according to claim 1 wherein, in step S5, the top of the left upright (4) is provided with a left saddle, which is provided with a left arc-shaped slot for engaging with the suspension wire (6); the top of the right upright post (5) is provided with a right saddle, and the right saddle is provided with a right arc-shaped groove matched with the suspension steel cable (6); the suspension steel cable (6) is respectively supported in the left arc-shaped groove of the left saddle and the right arc-shaped groove of the right saddle.
7. A method of installing a steel roof truss according to claim 1 wherein in step S5, the number of said suspension wires (6) is two, and the distance between the two suspension wires (6) is greater than the width of the steel roof truss (30).
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| JP2013133662A (en) * | 2011-12-27 | 2013-07-08 | Nippon Steel & Sumikin Engineering Co Ltd | Suspension type steel-framed roof frame, and method for constructing steel-framed roof |
| CN106703416B (en) * | 2015-07-30 | 2018-12-14 | 五冶集团上海有限公司 | Steel roof truss dead man hanging method in small space |
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