CN117846318A - Integral hoisting construction method for large-span double-slope trapezoid steel roof truss - Google Patents
Integral hoisting construction method for large-span double-slope trapezoid steel roof truss Download PDFInfo
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Abstract
The invention belongs to the technical field of steel structure construction, and provides a large-span double-slope trapezoid steel roof truss integral hoisting construction method which comprises the following steps: s1, conveying a left end steel roof truss, a middle steel roof truss, a right end steel roof truss and connecting web members to a construction site; s2, assembling a steel roof truss on the ground on site; s3, integrally hoisting the steel roof truss: obtaining space coordinates of all targets by using a binocular camera calibration system, and further monitoring whether synchronism difference exists in integral hoisting of the steel roof truss in real time; s4, temporarily fixing the steel roof truss; s5, permanently fixing the steel roof truss. The invention adopts the binocular recognition machine vision technology to determine the space gesture in the integral hoisting of the steel roof truss, timely recognizes and judges the cooperative abnormality in the integral hoisting of the steel roof truss and timely gives out early warning, effectively controls the synchronism of the integral hoisting of two cranes, and can achieve the purposes of convenient construction, construction period saving, cost reduction, safety and reliability in the integral hoisting process of the steel roof truss.
Description
Technical Field
The invention belongs to the technical field of steel structure construction, and particularly relates to a large-span double-slope trapezoid steel roof truss integral hoisting construction method.
Background
In recent years, the application of the steel structure in the large-span single-layer industrial factory buildings in China is attracting attention worldwide, and the large-span single-layer industrial factory buildings in China continuously keep a trend of rapid growth in a quite long time in the future. In single-story industrial plants, we often refer to the transverse truss members in roof structures as roof trusses. The shape of the common steel roof truss of the single-layer industrial factory building is generally triangular, trapezoidal and herringbone, and the slope direction of the roof truss can be divided into a single slope and a double slope. For large span roof trusses with spans not less than 42 meters, double slope trapezoidal steel roof trusses are generally used.
With the development of construction technology, more and more large-span double-slope trapezoid steel roof trusses begin to adopt a construction method of hoisting installation, and the construction method of hoisting installation generally comprises sectional hoisting and integral hoisting.
The sectional hoisting is generally to manufacture the large-span double-slope trapezoid steel roof truss in sections and then transport the large-span double-slope trapezoid steel roof truss to the site, erecting a full-hall scaffold on the site before hoisting, hoisting the sectional steel roof truss to the high altitude by adopting a single crane, and then splicing the sectional steel roof truss into a whole on the high altitude scaffold by workers. Because the sectional hoisting needs to set up the full scaffold, the construction workload is greatly increased, the construction period is prolonged, the cost is increased, and the construction personnel is required to finish assembling on the high-altitude scaffold, the workload of the high-altitude operation of the construction personnel is increased, and the safety risk of the construction personnel is increased.
The integral hoisting is generally to assemble the large-span double-slope trapezoid steel roof truss manufactured in a segmented mode on the ground on site into a whole, select hoisting points of a plurality of cranes on the steel roof truss according to experience before hoisting, then integrally hoist the steel roof truss by adopting the plurality of cranes, manually visually observe the aerial posture of the steel roof truss in the hoisting process, and manually command a plurality of crane drivers to further control the hoisting speed and synchronism of the plurality of cranes. The existing integral hoisting does not need to set up a full scaffold, so that the problems of large construction workload, long construction period, high cost, high risk of high-altitude operation of constructors and the like in the sectional hoisting can be solved, however, the air posture of the steel roof truss cannot be timely and accurately judged due to the fact that the air posture of the steel roof truss is needed to be manually visually detected, harmony abnormality in integral hoisting of a plurality of cranes cannot be timely identified, and early warning cannot be timely proposed.
Disclosure of Invention
The invention aims to provide a large-span double-slope trapezoid steel roof truss integral hoisting construction method, which adopts a binocular recognition machine vision technology to determine the space gesture in the steel roof truss integral hoisting, timely recognizes and judges the cooperative abnormality in the steel roof truss integral hoisting and timely gives out early warning, effectively controls the synchronism of the integral hoisting of two cranes, and can achieve the purposes of convenient construction, construction period saving, cost reduction, safety and reliability in the steel roof truss integral hoisting process.
In order to achieve the above purpose, the technical scheme adopted by the invention is to provide a construction method for integrally hoisting a large-span double-slope trapezoid steel roof truss, which is used for integrally hoisting the steel roof truss to a steel column, wherein the steel roof truss comprises a left end steel roof truss, a middle steel roof truss, a right end steel roof truss and a connecting web member, and is characterized by comprising the following steps:
s1, conveying a left end steel roof truss, a middle steel roof truss, a right end steel roof truss and connecting web members to a construction site;
s2, assembling a steel roof truss on the ground on site:
s21, providing a jig frame platform, wherein the jig frame platform is arranged on the ground on site, and the top surface of the jig frame platform is a horizontal plane with consistent elevation;
s22, horizontally placing the left end steel roof truss, the middle steel roof truss and the right end steel roof truss on a jig frame platform, then adjusting the positions among the left end steel roof truss, the middle steel roof truss and the right end steel roof truss to align the positions of bolt holes between every two steel roof trusses, and then fixedly connecting the left end steel roof truss with the middle steel roof truss, the middle steel roof truss and the right end steel roof truss by bolts respectively;
s23, horizontally placing two connecting web members on a bed-jig platform, wherein one connecting web member is fixedly arranged between the left end steel roof truss and the middle steel roof truss, and the other connecting web member is fixedly arranged between the middle steel roof truss and the right end steel roof truss, so that the left end steel roof truss, the middle steel roof truss, the right end steel roof truss and the connecting web members form a stable and reliable long-span double-slope trapezoid steel roof truss;
s24, arranging two targets on the lower chord of the large-span double-slope trapezoid steel roof truss at intervals along the length direction, wherein the two targets are arranged at equal heights, and the distance is more than or equal to half of the length of the steel roof truss;
s3, integrally hoisting the steel roof truss:
s31, providing two cranes, wherein each crane is provided with two steel wire ropes, and four hanging points are selected on the steel roof truss in a chord mode;
s32, connecting two steel wire ropes of the two cranes with four lifting points respectively, controlling the two cranes to synchronously lift the steel roof truss to lift the steel roof truss off a jig platform, simultaneously straightening the steel roof truss and then synchronously lifting the steel roof truss, and using a binocular camera calibration system to monitor the synchronism of the two cranes in real time during the lifting process of the steel roof truss so as to ensure the synchronism of the two cranes until the steel roof truss stops lifting after a certain distance from the ground, and then standing for a period of time;
s33, controlling the two cranes to synchronously land the steel roof truss and prevent the steel roof truss from contacting the ground, then synchronously lifting the steel roof truss again, and monitoring the synchronism of the two cranes in real time by using a binocular camera calibration system in the falling and lifting process of the steel roof truss so as to ensure the synchronism of the two cranes until the steel roof truss is at a certain distance from the ground, stopping lifting, and standing for a period of time;
s34, controlling the two cranes to synchronously lift the steel roof truss to the upper part of the steel column again, adjusting the steel roof truss to align the left end and the right end of the steel roof truss with the connection position of the steel column, and synchronously landing the steel roof truss on the steel column, wherein the synchronism of the two cranes is monitored in real time by using a binocular camera calibration system in the lifting and landing processes of the steel roof truss so as to ensure the synchronism of the two cranes;
the binocular camera calibration system is used for acquiring the space coordinates of the two targets in real time, comparing the height difference of the two targets obtained through calculation with a preset threshold value in the system, judging that the synchronism of the integral hoisting of the steel roof truss is abnormal if the height difference of the two targets exceeds the preset threshold value, sending an early warning signal to the crane by the binocular camera calibration system, and controlling the height difference of the two targets below the preset threshold value by the crane according to real-time adjustment;
s4, temporarily fixing the steel roof truss: stopping landing synchronously when the left end and the right end of the steel roof truss are contacted with the steel columns, correcting elevation, axis and verticality of the steel roof truss, temporarily and fixedly connecting the left end and the right end of the steel roof truss with the corresponding steel columns, and loosening hooks of two cranes;
s5, permanently fixing the steel roof truss: and welding the joint of the steel roof truss and the steel column, and adopting high-strength bolts for fixed connection to finish the integral hoisting of the large-span double-slope trapezoid steel roof truss.
Optionally, in step S24, the two targets are symmetrically arranged on the steel roof truss lower chord.
Optionally, the binocular camera calibration system comprises two industrial cameras and a processor, wherein each industrial camera is used for acquiring image information of two targets in the whole hoisting process of the steel roof truss in real time and sending the image information to the processor, and the processor calculates the height difference of the two targets according to the image information of the two targets and compares the height difference with a preset threshold value, and if the height difference exceeds the preset threshold value, an early warning signal is sent to the crane.
Optionally, the left-end steel roof truss comprises a left-end upper chord, a left-end lower chord, a left-end web member, a left-end node plate, a left-end base, a left-end upper chord end plate and a left-end lower chord end plate, wherein the plurality of left-end node plates are arranged on the left-end upper chord and the left-end lower chord, the plurality of left-end web members are arranged between the left-end upper chord and the left-end lower chord, the two ends of the left-end web member are connected with the left-end node plate, the left-end base and the left-end upper chord end plate are both arranged at the left end of the left-end upper chord, and the left-end lower chord end plate is arranged at the left side of the left-end lower chord;
the middle steel roof truss comprises a middle upper chord, a middle lower chord, middle web members, middle node plates, middle upper chord splice plates and middle lower chord splice plates, wherein a plurality of middle node plates are arranged on the middle upper chord and the middle lower chord;
the right-end steel roof truss comprises a right-end upper chord, a right-end lower chord, a right-end web member, a right-end node plate, a right-end base, a right-end upper chord end plate and a right-end lower chord end plate, wherein a plurality of right-end node plates are arranged on the right-end upper chord and the right-end lower chord, a plurality of right-end web members are arranged between the right-end upper chord and the right-end lower chord, two ends of the right-end web members are connected with the right-end node plate, the right-end base and the right-end upper chord end plate are both arranged at the left end of the right-end upper chord, and the right-end lower chord end plate is arranged at the right side of the right-end lower chord;
the step S22 specifically includes: and horizontally placing the left end steel roof truss, the middle steel roof truss and the right end steel roof truss on a jig frame platform, adjusting the positions among the left end steel roof truss, the middle steel roof truss and the right end steel roof truss to enable bolt holes on the right side of the left end upper chord to be aligned with bolt holes on the left side of the middle upper chord splice plate, bolt holes on the left side of the right end upper chord to be aligned with bolt holes on the right side of the middle upper chord splice plate, bolt holes on the left side of the right end lower chord to be aligned with bolt holes on the right side of the middle lower chord splice plate, and penetrating the left end steel roof truss and the middle steel roof truss into the bolt holes by adopting high-strength bolts to fixedly connect the left end steel roof truss and the middle steel roof truss and the right end steel roof truss.
Optionally, a steel column base is arranged at the top of the steel column, a steel column upper chord connection flange is arranged at the outer side of the top of the steel column base, and a steel column lower chord connection flange is arranged at the bottom of the steel column base;
the temporary fixing of the steel roof truss in the step S4 specifically comprises the following steps: when the left end base and the right end base of the steel roof truss are contacted with the steel column base, synchronous falling is stopped, then elevation, axis and verticality of the steel roof truss are corrected by using a crane in combination with a crowbar and a jack, then the left end base and the right end base are fixed with the corresponding steel column base by adopting temporary bolts, then the left end upper chord end plate and the right end upper chord end plate are fixed with the corresponding steel column upper chord connecting flanges by spot welding, the left end lower chord end plate and the right end lower chord end plate are fixed with the corresponding steel column lower chord connecting flanges by spot welding, and then hooks of the two cranes are loosened.
Optionally, the left upper chord, the left lower chord, the left web member, the middle upper chord, the middle lower chord, the middle web member, the right upper chord, the right lower chord, the right web member and the connecting web member are all made of steel materials, and the section forms of the connecting web member are rectangular pipes, round pipes, I-steel, channel steel or angle steel.
Optionally, the bolt holes on the left end base and the right end base are enlarged bolt holes.
Optionally, the target is made of square white paper with the side length of 100-200 mm and is adhered to the lower chord of the steel roof truss.
Optionally, the included angle between the steel wire rope and the horizontal plane is greater than or equal to 60 degrees.
Optionally, in step S31, selecting four suspension points at the upper end of the steel roof truss specifically includes: according to the principle that the internal force generated by the dead weight of the steel roof truss in the lifting process of the two cranes is minimum or deformation is minimum, four optimal lifting points are determined, and the four optimal lifting points are arranged at the crossing positions of the left upper chord and the left web member, the crossing positions of the middle upper chord and the middle web member, the crossing positions of the right upper chord and the right web member or the crossing positions of the left upper chord, the middle upper chord and the right upper chord and the connecting web member.
The invention has the beneficial effects that: according to the invention, a binocular camera calibration system is arranged at a proper position of a construction site through a binocular recognition machine vision technology, two targets with equal height are arranged on a steel roof truss at intervals, the binocular camera calibration system is utilized to collect real-time images of the two targets arranged on the large-span double-slope trapezoid steel roof truss, space calculation and conversion are carried out through parallax, so that space coordinate information of the targets on the steel roof truss is obtained, the space coordinates of the two targets are compared to obtain the height difference of the two targets, the height difference is compared with a preset threshold in the system, if the height difference of the two targets exceeds the preset threshold, the situation that the synchronism of the whole hoisting of the steel roof truss is abnormal is judged, the binocular camera calibration system sends an early warning signal to a crane, the crane adjusts in real time according to the situation, and controls the height difference of the two targets below the preset threshold, if the height difference does not exceed the preset threshold, the synchronism of the two targets is normal is judged, and therefore the synchronism of the two targets in the whole hoisting of the steel roof truss can be recognized and judged in time, if the difference exists, an early warning signal is provided for a driver, the whole hoisting of the steel roof truss is guaranteed, the whole hoisting is safe and the whole hoisting of the steel roof truss can be guaranteed, and the crane is safe and convenient to be constructed; meanwhile, the large-span double-slope trapezoid steel roof truss is assembled on site and then integrally hoisted by adopting the two cranes, so that the workload of constructors in high-altitude operation is greatly reduced, and a hall scaffold is not required to be erected on site, thereby saving the construction period, reducing the cost and reducing the safety risk of the constructors; finally, after the steel roof truss is hoisted in place, the steel roof truss is temporarily fixed, the crane is loosened, and then the steel roof truss is permanently fixed, so that the service cycle of the crane can be shortened, and the cost is further reduced.
The invention provides a large-span double-slope trapezoid steel roof truss integral hoisting construction method, which adopts a binocular recognition machine vision technology to determine the space gesture in the steel roof truss integral hoisting, timely recognizes and judges the cooperative abnormality in the steel roof truss integral hoisting and timely gives out early warning, effectively controls the synchronism of the integral hoisting of two cranes, and can achieve the purposes of convenient construction, construction period saving, cost reduction, safety and reliability in the steel roof truss integral hoisting process.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic structural view of a large-span double-slope trapezoid steel roof truss provided by an embodiment of the invention;
FIG. 2 is a schematic view of the structure of a left-end steel roof truss according to an embodiment of the invention;
FIG. 3 is a schematic view of an intermediate steel roof truss in accordance with an embodiment of the invention;
FIG. 4 is a schematic view of the right-hand steel roof truss in accordance with an embodiment of the invention;
fig. 5 is a schematic view of the structure of a steel column according to an embodiment of the present invention.
In the figure: 1-left steel roof truss, 11-left upper chord, 12-left lower chord, 13-left web member, 14-left gusset plate, 15-left base, 16-left upper chord end plate, 17-left lower chord end plate, 2-middle steel roof truss, 21-middle upper chord, 22-middle lower chord, 23-middle web member, 24-middle gusset plate, 25-middle upper chord splice plate, 26-middle lower chord splice plate, 3-right steel roof truss, 31-right upper chord, 32-right lower chord, 33-right web member, 34-right gusset plate, 35-right base, 36-right upper chord end plate, 37-right lower chord end plate, 4-connecting web member, 5-target, 6-steel column, 61-steel column base, 62-steel column upper chord connection flange, 63-steel column lower chord connection flange, 7-steel wire rope, 8-lifting hook.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, the invention provides a construction method for integrally hoisting a large-span double-slope trapezoid steel roof truss, which is used for integrally hoisting the steel roof truss to a steel column 6, wherein the steel roof truss comprises a left end steel roof truss 1, a middle steel roof truss 2, a right end steel roof truss 3 and a connecting web member 4, and the method comprises the following steps:
s1, conveying a left end steel roof truss 1, a middle steel roof truss 2, a right end steel roof truss 3 and a connecting web member 4 to a construction site;
s2, assembling a steel roof truss on the ground on site:
s21, manufacturing a jig frame platform for steel structure assembly on a construction site before assembly, wherein the jig frame platform is installed on the ground on the site, and the elevation of the top surface of the jig frame platform is controlled to be consistent by using a level gauge, so that the top surface of the jig frame platform is ensured to be a horizontal plane with the consistent elevation;
s22, horizontally placing the left end steel roof truss 1, the middle steel roof truss 2 and the right end steel roof truss 3 on a jig frame platform, then adjusting the positions among the three to align the positions of bolt holes between every two, and then fixedly connecting the left end steel roof truss with the middle steel roof truss, the middle steel roof truss with the right end steel roof truss by bolts respectively;
s23, horizontally placing two connecting web members 4 on a bed-jig platform, wherein one connecting web member is fixedly arranged between the left end steel roof truss 1 and the middle steel roof truss 2, and the other connecting web member is fixedly arranged between the middle steel roof truss 2 and the right end steel roof truss 3, so that the left end steel roof truss 1, the middle steel roof truss 2, the right end steel roof truss 3 and the connecting web members 4 form a stable and reliable large-span double-slope trapezoid steel roof truss;
s24, arranging two targets on the lower chord of the large-span double-slope trapezoid steel roof truss at intervals along the length direction, wherein the two targets are arranged at equal heights, and the distance is more than or equal to half of the length of the steel roof truss;
s3, integrally hoisting the steel roof truss, and monitoring the synchronism of the integral hoisting of the two cranes in real time by adopting a binocular recognition machine vision technology:
s31, providing two cranes, wherein the lifting hook 8 of each crane is provided with two steel wire ropes 7, and four lifting points are selected on the steel roof truss in a chord manner;
s32, connecting two steel wire ropes of the two cranes with four lifting points respectively, controlling the two cranes to synchronously lift the steel roof truss to lift the steel roof truss off a jig platform, simultaneously straightening the steel roof truss and then synchronously lifting the steel roof truss, and using a binocular camera calibration system to monitor the synchronism of the two cranes in real time during the lifting process of the steel roof truss so as to ensure the synchronism of the two cranes until the steel roof truss stops lifting after a certain distance (about 1 m) from the ground, and then standing for a period of time (10 minutes);
s33, controlling the two cranes to synchronously land the steel roof truss and enable the steel roof truss not to contact the ground (about 0.5m away from the ground), then synchronously lifting the steel roof truss again, monitoring the synchronism of the two cranes in real time by using a binocular camera calibration system in the falling and lifting processes of the steel roof truss so as to ensure the synchronism of the two cranes until the steel roof truss is at a certain distance (about 1m away from the ground), stopping lifting again, and standing for a period of time (about 10 minutes);
s34, controlling the two cranes to synchronously lift the steel roof truss to the upper part of the steel column again (specifically, the left end base and the right end base can be stopped when the left end base and the right end base exceed 0.5m of the steel column base), adjusting the steel roof truss to enable the connection positions of the left end and the right end of the steel roof truss and the steel column to be aligned (a cable rope can be used for finely adjusting the rotary steel roof truss to enable the left end base and the right end base to be aligned with the steel column base and then to synchronously land in place), and synchronously landing the steel roof truss on the steel column, wherein the synchronism of the two cranes is monitored in real time by using a binocular camera calibration system in the lifting and landing processes of the steel roof truss so as to ensure the synchronism of the two cranes;
the binocular camera calibration system is used for acquiring the space coordinates of the two targets in real time, comparing the height difference of the two targets obtained through calculation with a preset threshold value in the system, judging that the synchronism of the integral hoisting of the steel roof truss is abnormal if the height difference of the two targets exceeds the preset threshold value, sending an early warning signal to the crane by the binocular camera calibration system, and controlling the height difference of the two targets below the preset threshold value through real-time adjustment of the crane;
s4, temporarily fixing the steel roof truss: stopping landing synchronously when the left end and the right end of the steel roof truss are contacted with the steel columns, correcting elevation, axis and verticality of the steel roof truss, temporarily and fixedly connecting the left end and the right end of the steel roof truss with the corresponding steel columns, and loosening hooks of two cranes;
s5, permanently fixing the steel roof truss: and welding the joint of the steel roof truss and the steel column, and adopting high-strength bolts for fixed connection to finish the integral hoisting of the large-span double-slope trapezoid steel roof truss.
In one embodiment, as shown in fig. 1, in step S24, two targets 5 are symmetrically arranged on a steel roof truss. More preferably, the two targets are respectively arranged at the two ends of the lower chord of the steel roof truss, and the more the distance between the two targets is, the more the height difference of the left side and the right side of the steel roof truss can be accurately measured.
In one embodiment, the binocular camera calibration system comprises two industrial cameras and a processor, wherein each industrial camera is used for acquiring image information of two targets in the whole hoisting process of the steel roof truss in real time and transmitting the image information to the processor, the processor performs space calculation and conversion according to the image information of the two targets by utilizing parallax to obtain space coordinates of the two targets, then calculates the height difference of the two targets according to the space coordinates of the two targets, compares the height difference with a preset threshold, and transmits an early warning signal to a crane if the preset threshold is exceeded. Two industrial cameras are arranged at proper positions on a construction site, so that each industrial camera can shoot the whole process of lifting the steel roof truss. The spatial coordinates of all targets can be determined in real time by adopting a binocular recognition machine vision technology, so that the synchronism of the integral hoisting of two cranes is monitored in real time, and early warning is provided for a crane driver in time, and the cranes are adjusted to enable the two cranes to hoist synchronously.
In one embodiment, as shown in fig. 2, the left steel roof truss 1 includes a left upper chord 11, a left lower chord 12, a left web member 13, a left gusset plate 14, a left base 15, a left upper chord end plate 16 and a left lower chord end plate 17, wherein a plurality of left gusset plates 14 are disposed on the left upper chord 11 and the left lower chord 12, a plurality of left web members 13 are disposed between the left upper chord 11 and the left lower chord 12, and both ends are connected with the left gusset plates 14, the left base 15 and the left upper chord end plate 16 are both mounted on the left end of the left upper chord 11, and the left lower chord end plate 17 is mounted on the left side of the left lower chord 12;
as shown in fig. 3, the middle steel roof truss 2 includes a middle upper chord 21, a middle lower chord 22, a middle web member 23, a middle gusset plate 24, a middle upper chord splice plate 25 and a middle lower chord splice plate 26, wherein a plurality of middle gusset plates 24 are arranged on the middle upper chord 21 and the middle lower chord 22, a plurality of middle web members 23 are arranged between the middle upper chord 21 and the middle lower chord 22, two ends of the middle web members are connected with the middle gusset plates 24, the middle upper chord splice plate 25 is arranged at two ends of the middle upper chord 21, and the middle lower chord splice plate 26 is arranged at two ends of the middle lower chord 22;
as shown in fig. 4, the right-end steel roof truss 3 includes a right-end upper chord 31, a right-end lower chord 32, a right-end web member 33, a right-end gusset 34, a right-end base 35, a right-end upper chord end plate 36 and a right-end lower chord end plate 37, wherein a plurality of right-end gusset 34 are arranged on the right-end upper chord 31 and the right-end lower chord 32, a plurality of right-end web members 33 are arranged between the right-end upper chord 31 and the right-end lower chord 32, both ends of the right-end web member 33 are connected with the right-end gusset 34, and the right-end base 35 and the right-end upper chord end plate 36 are both mounted on the left end of the right-end upper chord 31, and the right-end lower chord end plate 37 is mounted on the right side of the right-end lower chord 32;
the step S22 specifically includes: the left end steel roof truss 1, the middle steel roof truss 2 and the right end steel roof truss 3 are horizontally placed on a jig frame platform, positions among the left end steel roof truss 1, the middle steel roof truss 2 and the right end steel roof truss 3 are adjusted, bolt holes on the right side of a left end upper chord 11 are aligned with bolt holes on the left side of a middle upper chord splice plate 25, bolt holes on the right side of a left end lower chord 12 are aligned with bolt holes on the left side of a middle lower chord splice plate 26, bolt holes on the left side of a right end upper chord 31 are aligned with bolt holes on the right side of the middle upper chord splice plate 25, bolt holes on the left side of a right end lower chord 32 are aligned with bolt holes on the right side of the middle lower chord splice plate 26, and then high-strength bolts penetrate into the bolt holes to fixedly connect the left end steel roof truss 1 with the middle steel roof truss 2, the middle steel roof truss 2 and the right end steel roof truss 3.
The invention can sequentially manufacture the left end steel roof truss, the middle steel roof truss, the right end steel roof truss and the connecting web members at a processing factory according to the drawing requirements, and the steel roof truss is transported to a construction site to complete the integral assembly of the steel roof truss on the ground on the site. When the left-end steel roof truss is assembled, a plurality of left-end node plates are welded on a left-end upper chord and a left-end lower chord according to the drawing requirements, a plurality of left-end web members are sequentially welded on the left-end node plates, a left-end base and a left-end upper chord end plate are sequentially welded on a left-end upper chord and a left-end lower chord, finally a left-end base and a right-end upper chord are sequentially welded on a right-end upper chord and a left-end lower chord according to the drawing requirements when the middle steel roof truss is assembled, a plurality of middle node plates are sequentially welded on a middle upper chord and a middle lower chord according to the drawing requirements, a plurality of middle web members are sequentially welded on middle node plates, middle upper chord splice plates are sequentially arranged at two ends of the middle upper chord, middle lower chord splice plates are sequentially arranged on two sides of the middle lower chord, and a plurality of right-end node plates are sequentially welded on a right-end upper chord and a right-end lower chord according to the drawing requirements when the right-end steel roof truss is assembled, and the right-end web members are sequentially welded on a right-end node plate and a right-end lower chord are sequentially arranged on the right-end chord end plate.
In one embodiment, as shown in fig. 1, step S23 specifically includes: two connecting web members 4 are horizontally placed on a jig frame platform, one of the connecting web members is fixedly installed between a left end steel roof truss 1 and a middle steel roof truss 2, the other connecting web member is fixedly installed between the middle steel roof truss 2 and a right end steel roof truss 3, specifically, two ends of the connecting web members are welded with corresponding left end node plates, middle node plates and right end node plates, so that the left end steel roof truss 1, the middle steel roof truss 2, the right end steel roof truss 3 and the connecting web members 4 form a stable and reliable large-span double-slope trapezoid steel roof truss.
In one embodiment, as shown in fig. 5, a steel column base 61 is provided at the top of the steel column 6, a steel column upper chord connection flange 62 is provided at the outer side of the top of the steel column base 61, and a steel column lower chord connection flange 63 is provided at the bottom of the steel column base 61;
as shown in fig. 1, the temporary fixing of the steel roof truss in step S4 specifically includes: when the left end base 15 and the right end base 35 of the steel roof truss contact the steel column base 61, the falling is stopped synchronously, then the elevation, the axis and the verticality of the steel roof truss are corrected by using a crane to match with a crowbar and a jack, then the left end base 15 and the right end base 35 are fixed with the corresponding steel column bases by adopting temporary bolts, then the left end upper chord end plate 16 and the right end upper chord end plate 36 are fixed with the corresponding steel column upper chord connection flange 62 by spot welding, the left end lower chord end plate 17 and the right end lower chord end plate 37 are fixed with the corresponding steel column lower chord connection flange 63 by spot welding, and then the hooks of the two cranes are loosened.
In one embodiment, the left upper chord, the left lower chord, the left web member, the middle upper chord, the middle lower chord, the middle web member, the right upper chord, the right lower chord, the right web member and the connecting web member are all made of steel materials, and the cross section of the connecting web member is rectangular pipe, circular pipe, I-steel, channel steel or angle steel.
In one embodiment, the bolt holes on the left and right bases are enlarged bolt holes.
In one embodiment, the targets are made of square white paper with a side length of 100-200 mm and are adhered to the lower chord of the steel roof truss.
In one embodiment, the angle between the wire rope and the horizontal plane is greater than or equal to 60 °.
Because in the existing integral hoisting, the hoisting points of a plurality of cranes need to be selected according to experience, and the selection of the hoisting points is not calculated by technicians, safety risks such as deformation or overturning of the steel roof truss in the hoisting process are caused due to unreasonable setting of the hoisting points, and therefore in one embodiment, in the step S31, the selection of four hoisting points at the upper end of the steel roof truss specifically comprises: according to the principle that the internal force generated by the dead weight of the steel roof truss in the lifting process of the two cranes is minimum or deformation is minimum, four optimal lifting points are determined, and the four optimal lifting points are arranged at the crossing positions of the left upper chord and the left web member, the crossing positions of the middle upper chord and the middle web member, the crossing positions of the right upper chord and the right web member and the crossing positions of the left upper chord, the middle upper chord and the right upper chord and the connecting web member. According to the principle that the internal force generated by the dead weight of the steel roof truss is minimum or deformation is minimum in the lifting process of the two cranes, the optimal lifting point combination setting scheme is calculated by technicians, and four optimal lifting points are finally determined, so that the safety risks of deformation or overturning and the like of the steel roof truss in the lifting process due to unreasonable lifting point setting are greatly reduced, and the safety and reliability of the integral lifting process of the steel roof truss are improved.
As shown in fig. 1, the hanging points include hanging points a, B, C, D, E and F on the left and right sides of the steel roof truss, and before hoisting, the optimal hanging point combination setting scheme is determined by calculating various hanging point combination setting schemes such as hanging points a and D, B and E, C and F, C and D, D and D, and D and E on the left and right sides of the steel roof truss, respectively, and determining four optimal hanging points as hanging points B, E and E on the left and right sides, respectively, according to the principle that the internal force generated by the two cranes due to the dead weight of the steel roof truss is minimum or deformation is minimum in the hoisting process.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the various embodiments of the invention, which should be set forth in the following claims.
Claims (10)
1. The construction method for integrally hoisting the large-span double-slope trapezoid steel roof truss is used for integrally hoisting the steel roof truss to a steel column, and the steel roof truss comprises a left end steel roof truss, a middle steel roof truss, a right end steel roof truss and a connecting web member, and is characterized by comprising the following steps:
s1, conveying a left end steel roof truss, a middle steel roof truss, a right end steel roof truss and connecting web members to a construction site;
s2, assembling a steel roof truss on the ground on site:
s21, providing a jig frame platform, wherein the jig frame platform is arranged on the ground on site, and the top surface of the jig frame platform is a horizontal plane with consistent elevation;
s22, horizontally placing the left end steel roof truss, the middle steel roof truss and the right end steel roof truss on a jig frame platform, then adjusting the positions among the left end steel roof truss, the middle steel roof truss and the right end steel roof truss to align the positions of bolt holes between every two steel roof trusses, and then fixedly connecting the left end steel roof truss with the middle steel roof truss, the middle steel roof truss and the right end steel roof truss by bolts respectively;
s23, horizontally placing two connecting web members on a bed-jig platform, wherein one connecting web member is fixedly arranged between the left end steel roof truss and the middle steel roof truss, and the other connecting web member is fixedly arranged between the middle steel roof truss and the right end steel roof truss, so that the left end steel roof truss, the middle steel roof truss, the right end steel roof truss and the connecting web members form a stable and reliable long-span double-slope trapezoid steel roof truss;
s24, arranging two targets on the lower chord of the large-span double-slope trapezoid steel roof truss at intervals along the length direction, wherein the two targets are arranged at equal heights, and the distance is more than or equal to half of the length of the steel roof truss;
s3, integrally hoisting the steel roof truss:
s31, providing two cranes, wherein each crane is provided with two steel wire ropes, and four hanging points are selected on the steel roof truss in a chord mode;
s32, connecting two steel wire ropes of the two cranes with four lifting points respectively, controlling the two cranes to synchronously lift the steel roof truss to lift the steel roof truss off a jig platform, simultaneously straightening the steel roof truss and then synchronously lifting the steel roof truss, and using a binocular camera calibration system to monitor the synchronism of the two cranes in real time during the lifting process of the steel roof truss so as to ensure the synchronism of the two cranes until the steel roof truss stops lifting after a certain distance from the ground, and then standing for a period of time;
s33, controlling the two cranes to synchronously land the steel roof truss and prevent the steel roof truss from contacting the ground, then synchronously lifting the steel roof truss again, and monitoring the synchronism of the two cranes in real time by using a binocular camera calibration system in the falling and lifting process of the steel roof truss so as to ensure the synchronism of the two cranes until the steel roof truss is at a certain distance from the ground, stopping lifting, and standing for a period of time;
s34, controlling the two cranes to synchronously lift the steel roof truss to the upper part of the steel column again, adjusting the steel roof truss to align the left end and the right end of the steel roof truss with the connection position of the steel column, and synchronously landing the steel roof truss on the steel column, wherein the synchronism of the two cranes is monitored in real time by using a binocular camera calibration system in the lifting and landing processes of the steel roof truss so as to ensure the synchronism of the two cranes;
the binocular camera calibration system is used for acquiring the space coordinates of the two targets in real time, comparing the height difference of the two targets obtained through calculation with a preset threshold value in the system, judging that the synchronism of the integral hoisting of the steel roof truss is abnormal if the height difference of the two targets exceeds the preset threshold value, sending an early warning signal to the crane by the binocular camera calibration system, and controlling the height difference of the two targets below the preset threshold value by the crane according to real-time adjustment;
s4, temporarily fixing the steel roof truss: stopping landing synchronously when the left end and the right end of the steel roof truss are contacted with the steel columns, correcting elevation, axis and verticality of the steel roof truss, temporarily and fixedly connecting the left end and the right end of the steel roof truss with the corresponding steel columns, and loosening hooks of two cranes;
s5, permanently fixing the steel roof truss: and welding the joint of the steel roof truss and the steel column, and adopting high-strength bolts for fixed connection to finish the integral hoisting of the large-span double-slope trapezoid steel roof truss.
2. The method for integrally hoisting and constructing the large-span double-slope trapezoidal steel roof truss according to claim 1, wherein in the step S24, two targets are symmetrically arranged on the lower chord of the steel roof truss.
3. The method for integrally hoisting the large-span double-slope trapezoid steel roof truss according to claim 1, wherein the binocular camera calibration system comprises two industrial cameras and a processor, each industrial camera is used for acquiring image information of two targets in the whole hoisting process of the steel roof truss in real time and sending the image information to the processor, the processor calculates the height difference of the two targets according to the image information of the two targets, compares the height difference with a preset threshold, and sends an early warning signal to a crane if the preset threshold is exceeded.
4. The method for integrally hoisting and constructing the large-span double-slope trapezoidal steel roof truss as claimed in claim 1, wherein,
the left-end steel roof truss comprises a left-end upper chord, a left-end lower chord, a left-end web member, a left-end gusset plate, a left-end base, a left-end upper chord end plate and a left-end lower chord end plate, wherein a plurality of left-end gusset plates are arranged on the left-end upper chord and the left-end lower chord, a plurality of left-end web members are arranged between the left-end upper chord and the left-end lower chord, two ends of the left-end web members are connected with the left-end gusset plates, the left-end base and the left-end upper chord end plate are both arranged at the left end of the left-end upper chord, and the left-end lower chord end plate is arranged at the left side of the left-end lower chord;
the middle steel roof truss comprises a middle upper chord, a middle lower chord, middle web members, middle node plates, middle upper chord splice plates and middle lower chord splice plates, wherein a plurality of middle node plates are arranged on the middle upper chord and the middle lower chord;
the right-end steel roof truss comprises a right-end upper chord, a right-end lower chord, a right-end web member, a right-end node plate, a right-end base, a right-end upper chord end plate and a right-end lower chord end plate, wherein a plurality of right-end node plates are arranged on the right-end upper chord and the right-end lower chord, a plurality of right-end web members are arranged between the right-end upper chord and the right-end lower chord, two ends of the right-end web members are connected with the right-end node plate, the right-end base and the right-end upper chord end plate are both arranged at the left end of the right-end upper chord, and the right-end lower chord end plate is arranged at the right side of the right-end lower chord;
the step S22 specifically includes: and horizontally placing the left end steel roof truss, the middle steel roof truss and the right end steel roof truss on a jig frame platform, adjusting the positions among the left end steel roof truss, the middle steel roof truss and the right end steel roof truss to enable bolt holes on the right side of the left end upper chord to be aligned with bolt holes on the left side of the middle upper chord splice plate, bolt holes on the left side of the right end upper chord to be aligned with bolt holes on the right side of the middle upper chord splice plate, bolt holes on the left side of the right end lower chord to be aligned with bolt holes on the right side of the middle lower chord splice plate, and penetrating the left end steel roof truss and the middle steel roof truss into the bolt holes by adopting high-strength bolts to fixedly connect the left end steel roof truss and the middle steel roof truss and the right end steel roof truss.
5. The method for integrally hoisting and constructing the large-span double-slope trapezoidal steel roof truss as claimed in claim 4, wherein,
the top of the steel column is provided with a steel column base, the outer side of the top of the steel column base is provided with a steel column upper chord connection flange, and the bottom of the steel column base is provided with a steel column lower chord connection flange;
the temporary fixing of the steel roof truss in the step S4 specifically comprises the following steps: when the left end base and the right end base of the steel roof truss are contacted with the steel column base, synchronous falling is stopped, then elevation, axis and verticality of the steel roof truss are corrected by using a crane in combination with a crowbar and a jack, then the left end base and the right end base are fixed with the corresponding steel column base by adopting temporary bolts, then the left end upper chord end plate and the right end upper chord end plate are fixed with the corresponding steel column upper chord connecting flanges by spot welding, the left end lower chord end plate and the right end lower chord end plate are fixed with the corresponding steel column lower chord connecting flanges by spot welding, and then hooks of the two cranes are loosened.
6. The construction method for integrally hoisting the large-span double-slope trapezoidal steel roof truss according to claim 4, wherein the left upper chord, the left lower chord, the left web member, the middle upper chord, the middle lower chord, the middle web member, the right upper chord, the right lower chord, the right web member and the connecting web member are all made of steel materials, and the cross section of the steel materials is rectangular pipes, round pipes, I-steel, channel steel or angle steel.
7. The construction method for integrally hoisting the large-span double-slope trapezoidal steel roof truss according to claim 4, wherein the bolt holes on the left end base and the right end base are enlarged bolt holes.
8. The construction method for integrally hoisting the large-span double-slope trapezoidal steel roof truss according to claim 1, wherein the target is made of square white paper with the side length of 100-200 mm and is adhered to the lower chord of the steel roof truss.
9. The construction method for integrally hoisting the large-span double-slope trapezoidal steel roof truss according to claim 1, wherein an included angle between the steel wire rope and a horizontal plane is more than or equal to 60 degrees.
10. The construction method for integrally hoisting a large-span double-slope trapezoidal steel roof truss according to claim 1, wherein in step S31, selecting four hoisting points on the steel roof truss specifically comprises: according to the principle that the internal force generated by the dead weight of the steel roof truss in the lifting process of the two cranes is minimum or deformation is minimum, four optimal lifting points are determined, and the four optimal lifting points are arranged at the crossing positions of the left upper chord and the left web member, the crossing positions of the middle upper chord and the middle web member, the crossing positions of the right upper chord and the right web member or the crossing positions of the left upper chord, the middle upper chord and the right upper chord and the connecting web member.
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| CN202311690745.0A CN117846318A (en) | 2023-12-11 | 2023-12-11 | Integral hoisting construction method for large-span double-slope trapezoid steel roof truss |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311690745.0A CN117846318A (en) | 2023-12-11 | 2023-12-11 | Integral hoisting construction method for large-span double-slope trapezoid steel roof truss |
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