CN113358315B - Installation and construction method of large drop test platform - Google Patents
Installation and construction method of large drop test platform Download PDFInfo
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- CN113358315B CN113358315B CN202110617050.4A CN202110617050A CN113358315B CN 113358315 B CN113358315 B CN 113358315B CN 202110617050 A CN202110617050 A CN 202110617050A CN 113358315 B CN113358315 B CN 113358315B
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- 238000010276 construction Methods 0.000 title claims abstract description 22
- 238000012360 testing method Methods 0.000 title claims abstract description 19
- 238000009434 installation Methods 0.000 title claims abstract description 18
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 302
- 239000010959 steel Substances 0.000 claims abstract description 302
- 238000003466 welding Methods 0.000 claims description 98
- 238000012545 processing Methods 0.000 claims description 42
- 238000003754 machining Methods 0.000 claims description 19
- 230000007547 defect Effects 0.000 claims description 13
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- 238000003801 milling Methods 0.000 claims description 9
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 6
- 229910001374 Invar Inorganic materials 0.000 claims description 6
- 239000002932 luster Substances 0.000 claims description 6
- 238000010583 slow cooling Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 239000011324 bead Substances 0.000 claims description 4
- 238000005498 polishing Methods 0.000 claims description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 3
- 239000001569 carbon dioxide Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims 2
- 238000000227 grinding Methods 0.000 claims 1
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- 230000008859 change Effects 0.000 description 3
- 238000004321 preservation Methods 0.000 description 3
- 241000830107 Pediomelum Species 0.000 description 2
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- 230000004048 modification Effects 0.000 description 2
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- 238000002360 preparation method Methods 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
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- 238000007906 compression Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/08—Shock-testing
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- E—FIXED CONSTRUCTIONS
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- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
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Abstract
The invention discloses an installation and construction method of a large-scale drop test platform, which comprises the following steps: the concrete pouring system comprises a steel platform, steel pillars, a concrete pouring layer under the steel platform, a bearing platform and a pile foundation; the bearing platform is arranged above the pile foundation, the steel support is fixedly arranged on the bearing platform, the steel platform is arranged above the steel support and is arranged in the center of the bearing platform, and the concrete pouring layer below the steel platform is arranged between the bearing platform and the steel platform; the steel platform comprises three steel plates, and the three steel plates are connected in a Z-shaped lap joint mode along the long edge direction of the steel plates. The steel platforms are connected in a Z-shaped lap joint and high-strength bolt fixing mode, the integrity of a large-scale test platform is guaranteed, the depth and the length of the inclined groove in the Z-shaped lap joint are set, and the steel plates have holes after being installed, so that the steel plates have adjusting space, and the requirement on flatness is guaranteed.
Description
Technical Field
The invention relates to the technical field of drop test platforms, in particular to a mounting and construction method of a large drop test platform.
Background
A drop test steel plate platform in a Chinese nuclear power engineering laboratory is mainly used for a 70t heavy and 6m long dumbbell-shaped vessel filled with nuclear power spent fuel, free drop action is carried out from a 9m high drop rack, impact is carried out on the drop test platform, data generated in the impact process are collected through surface change and damage conditions of a storage tank, and data support is provided for subsequent related research and processing production. The tongue-and-groove is 12m long and 200mm wide, and the processing error of the tongue-and-groove also directly influences the installation quality of the steel plate.
At present, the weight of a domestic single steel billet is 55 tons at most, the rolling steel plate compression ratio is 0.7, and the maximum weight of a single steel plate which can be processed is 38.5 tons. The steel sheet is easily deformed due to its heavy weight. At present, no test platform which can meet the overall requirement of 1/6000 on installation accuracy is available.
Disclosure of Invention
Aiming at the defects of the prior art, the invention designs a large-scale drop test platform, which comprises: the concrete pouring system comprises a steel platform, steel pillars, a concrete pouring layer under the steel platform, a bearing platform and a pile foundation; the bearing platform is arranged above the pile foundation, the steel support is fixedly arranged on the bearing platform, the steel platform is arranged above the steel support and is arranged in the center of the bearing platform, and the concrete pouring layer below the steel platform is arranged between the bearing platform and the steel platform; the steel platform comprises three steel plates, and the three steel plates are connected in a Z-shaped lap joint and high-strength bolt fixing mode along the long edge direction of the steel plates.
Preferably, each steel plate is formed by welding two 160-millimeter-thick ultra-thick plates, wherein a first Z-shaped lap joint opening is formed in one long edge of each steel plate, a second Z-shaped lap joint opening is formed in the other steel plate, the first Z-shaped lap joint opening and the second Z-shaped lap joint opening are of chute structures, the depth of one end of the inner side of each chute structure is larger than that of one end of the outer side of each chute structure, and the length of each chute structure of the first Z-shaped lap joint opening is larger than that of each chute structure of the second Z-shaped lap joint opening; the chute of first Z type overlap joint mouth and second Z type overlap joint mouth all is equipped with the bolt hole structurally, is equipped with the exhaust hole on the plane of steel sheet, installs the hoist and mount lug on the steel sheet.
Based on the same design idea, the invention provides a mounting and construction method of a large-scale drop test platform, which comprises the following steps: pouring a bearing platform and a pile foundation, and installing a steel support on the bearing platform; manufacturing a steel platform, carrying out factory pre-assembly and adjustment on the steel platform, and transporting the pre-assembled and adjusted steel platform to a site and installing the steel platform; pouring a lower concrete pouring layer of the steel platform between the steel platform and the bearing platform; wherein, the steel platform of preparation includes the following step: welding and splicing each super-thick steel plate; carrying out flatness processing on each welded steel plate; processing a first Z-shaped lap joint opening on one long edge of two steel plates, and processing a second Z-shaped lap joint opening on two long edges of the other steel plate; processing bolt holes and exhaust holes, and installing hoisting lugs on the steel plate; three steel plates are connected in a Z-shaped lap joint mode along the long side direction of the steel plates.
Preferably, the welding and splicing of each super-thick steel plate comprises the following steps: the upper surface and the lower surface of the welding part of the two ultra-thick plates are subjected to groove machining, the angles of the upper groove and the lower groove are 22.5 degrees, the length of a connecting section is 1-2mm, and the depth of the upper groove is 100 mm; mechanically polishing the surfaces of the grooves on the upper surface and the lower surface to obtain metallic luster, aligning the welding positions of the two ultra-thick plates, and enabling the interval between the middle connecting sections of the two ultra-thick plates to be 2-4 mm; preheating the upper slope side of the welding position at 150-180 ℃ by using flame, wherein the preheating width is 150 mm, and backing welding the middle connecting section by using carbon dioxide gas shielded welding; performing submerged-arc welding on the upper groove after backing welding, stopping welding when the welding depth is 45 mm, performing slow cooling treatment by adopting heat-insulating cotton, turning over a steel plate after the welding position is cooled, checking whether the defect exists at the root of a welding bead or not, performing welding on the defect if the defect exists, polishing the root of the welding bead to obtain metallic luster if the defect does not exist, and enabling a welding groove to be in smooth transition; preheating the lower slope side of the welding position at 150-180 ℃ by using flame, carrying out submerged-arc welding, stopping welding when the welding depth is 30 mm, carrying out slow cooling treatment by using heat-insulating cotton, and turning over a steel plate when the welding position is cooled; and repeating the previous step for four times by changing the welding depth, wherein the welding depth of the four times is as follows in sequence: completing the welding of the upper groove at a position 10mm away from the side edge of the upper groove and a position 3-5 mm away from the side edge of the lower groove, and completing the welding of the lower groove until the welding of the steel plate is completed; heating the welding line of the steel plate covered by the galvanic couple plate, slowly heating to 550-600 ℃ after heating to 250-300 ℃, keeping the temperature and preserving the heat for 3 hours, and then slowly cooling to room temperature by adopting heat preservation cotton.
Preferably, the flatness processing of each welded steel plate includes the steps of: processing the flatness of the bottom of a steel plate, horizontally placing the steel plate, processing a steel column process adjusting plane for installing a steel strut, and planing for 5mm, wherein the roughness is 12.5 mu m, and the flatness is 0.5mm; and (3) processing the flatness of the upper end face of the steel plate, turning the steel plate by using a lifting appliance and horizontally placing, finely milling the upper end face of the steel plate and planing the whole steel plate, wherein the planing depth is 5-10 mm, the roughness is 12.5um, and the flatness is 0.2mm.
Preferably, the step of processing a first Z-shaped overlapping opening on one long side of two steel plates and a second Z-shaped overlapping opening on two long sides of the other steel plate comprises the following steps: finish machining of a chute structure of the first Z-shaped lap joint opening is completed on one long side of the two steel plates by rough milling and finish milling in sequence, the machining depth of one end of the inner side of the chute structure is larger than that of one end of the outer side of the chute structure, 1 millimeter of machining allowance is reserved during machining, and fillet treatment is respectively carried out on a sharp corner and an inner concave corner of the outer protrusion of the Z-shaped lap joint opening, wherein the roughness is 6.3 mu m; and repeating the steps to process second Z-shaped lap joints on the two long sides of the other steel plate.
Preferably, processing bolt hole and exhaust hole, installation hoist and mount lug on the steel sheet includes following steps: processing bolt holes on a chute structure of the Z-shaped lap joint openings, wherein the bolt holes meet the condition that when the bolt holes are installed, the gap between the outer side edge of the first Z-shaped lap joint opening and the inner side edge of the second Z-shaped lap joint opening is controlled to be 0.5mm, and the gap between the inner side edge of the first Z-shaped lap joint opening and the outer side edge of the second Z-shaped lap joint opening is controlled to be 2 mm; processing a plurality of exhaust holes on the plane of the steel plate; and welding the lug plate of the lifting lug on the plane of the steel plate, and installing a steel wire rope on the lug plate.
Preferably, the factory pre-assembly and adjustment of the steel platform comprises the following steps: fixing steel pillars of a factory imitating a construction site on an assembly ground rail platform, and preliminarily unifying the heights of the steel pillars; placing two steel plates outside the steel platform on the steel support by using a crane; aligning the Z-shaped lap joint opening of the steel plate in the middle of the steel platform with the Z-shaped lap joint openings of the two steel plates on the outer side of the steel platform by using a crane, and connecting the steel plate in the middle of the steel platform and the two steel plates on the outer side of the steel platform through bolts and bolt holes on a chute of the Z-shaped lap joint openings; and (4) checking the flatness, dotting and leveling by using a level gauge and an invar ruler, adjusting the steel platform to meet the design requirement by using a hydraulic jack and a leveling bolt, and welding the pre-assembled and adjusted steel platform and the short strut in the steel strut.
Preferably, the transportation and installation of the pre-assembled and adjusted steel platform comprises the following steps: splitting the pre-assembled and adjusted steel platform, and transporting the steel platform to a construction site; firstly, two steel plates outside the steel platform are installed by a crane, and then the steel plate in the middle of the steel platform is installed; the elevation is controlled by using a high-precision level gauge and an invar ruler, leveling is performed by using a hydraulic jack and pre-embedded adjusting bolts, and after the flatness meets the design requirements, the steel platform and the steel support are fixed by high-strength bolts.
Preferably, the step of pouring the lower concrete pouring layer of the steel platform between the steel platform and the bearing platform comprises the following steps: and pouring a concrete pouring layer below the steel platform between the installed steel platform and the bearing platform, and plugging the reserved exhaust holes on the steel platform after pouring is finished.
Compared with the closest prior art, the invention has the beneficial effects that:
1. the steel platforms are connected in a Z-shaped lap joint mode, so that the integrity of the large-scale test platform is ensured.
2. The installation and construction method of the large-scale drop test platform ensures the requirements of machining precision and flatness through flatness machining and factory pre-assembly and adjustment.
3. According to the invention, through setting the depth and the length of the chute in the Z-shaped lap joint port, the steel plates have holes after being installed, so that the steel plates have an adjusting space, and the requirement of flatness is ensured.
Drawings
FIG. 1 is a schematic structural diagram of a large drop test platform according to the present invention.
FIG. 2 is a schematic view of the Z-lap joint of the present invention.
FIG. 3 is a schematic diagram of groove preparation according to the present invention.
Fig. 4 is a schematic view showing the change of the welding depth of the present invention.
Fig. 5 is a stress relief anneal curve of the present invention.
FIG. 6 is a flow chart of a mounting construction method of the large drop test platform of the invention.
Reference numerals:
the method comprises the following steps of 1-a steel platform, 2-a steel pillar, 3-a concrete pouring layer under the steel platform, 4-a bearing platform, 5-a pile foundation, 6-a first Z-shaped lap joint opening and 7-a second Z-shaped lap joint opening.
Detailed Description
The technical solution 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.
Example 1
The invention provides a large-scale drop test platform, as shown in fig. 1 and fig. 2, comprising: the steel platform comprises a steel platform 1, steel pillars 2, a concrete pouring layer 3 under the steel platform, a bearing platform 4 and a pile foundation 5. Bearing platform 4 sets up in the top of pile foundation 5, and steel pillar 2 is fixed to be set up on bearing platform 4, and steel platform 1 sets up in steel pillar 2 top to set up in the central authorities of bearing platform 4, layer 3 sets up between bearing platform 4 and steel platform 1 is pour to the concrete under the steel platform. Wherein, steel platform 1 includes three steel sheets, and three steel sheets are connected through Z type overlap joint and the fixed mode of high strength bolt along its long limit direction. Preferably, the pile foundation 5 is 50C 30 concrete cast-in-place piles with the length of 45m and the diameter of 800mm, the foundation is buried by 50 meters, the bearing platform 4 is 3.3mc30 concrete and 1.7mc60 concrete with three-level anti-seismic reinforcing steel bars with the diameter of 25mm and the length of 16m × 11.5m × 5m, and the steel struts 2 are 24 HW200 × 200 × 8 × 12 × 1500 long struts and 84 HW200 × 200 × 8 × 12 × 1000 short struts.
In a preferred embodiment, each steel plate is formed by welding two 160 mm thick ultra-thick plates, wherein two steel plates are provided with a first Z-shaped lap joint opening 6 on one long edge, and the other steel plate is provided with a second Z-shaped lap joint opening 7 on two long edges, the first Z-shaped lap joint opening 6 and the second Z-shaped lap joint opening 7 are both in a chute structure, the depth of the inner side end of the chute structure is greater than that of the outer side end, preferably, the depth of the inner side end is 100mm, and the depth of the outer side end is 60mm. Wherein the length of the chute structure of the first Z-shaped overlapping opening 6 is larger than that of the chute structure of the second Z-shaped overlapping opening 7. Preferably, the length of the chute structure of the first Z-shaped overlapping opening 6 is 1.5mm longer than that of the chute structure of the second Z-shaped overlapping opening 7. The chute of first Z type overlap joint mouth 6 and second Z type overlap joint mouth 7 is structural all to be equipped with the bolt hole, is equipped with the exhaust hole on the plane of steel sheet, installs the hoist and mount lug on the steel sheet. Preferably, the steel platform of the invention is a Q235-B steel plate with the thickness of 12m multiplied by 8m multiplied by 0.15m and consisting of three steel plates, the steel plate is provided with a welding seam at the position of 10.5m and 1.5m, the 12m long steel plate is formed by welding two steel plates and cutting the steel plate into blocks, namely the steel platform is formed by welding 6 ultra-thick plates, the specifications of the six ultra-thick plates are respectively 10.52m multiplied by 2.82m multiplied by 0.16m and 1.52m multiplied by 2.82m multiplied by 0.16m, and the specifications of the six ultra-thick plates are respectively 10.52m multiplied by 2.72m multiplied by 0.16m and 1.52m multiplied by 2.72m multiplied by 0.16m, and two ultra-thick plates are respectively. The diameter of the bolt hole is 54mm, and the bolt holes of the first Z-shaped lap joint opening 6 and the second Z-shaped lap joint opening 7 are fixed by adopting an M48@1000 high-strength bolt structure.
Example 2
As shown in fig. 1 to 6, the invention also provides an installation and construction method of the large drop test platform, which comprises the following steps: s1, pouring a bearing platform 4 and a pile foundation 5, and installing a steel pillar 2 on the bearing platform 4. S2, manufacturing the steel platform 1, carrying out factory pre-assembly and adjustment on the steel platform 1, and transporting the assembled steel platform 1 to the site and installing the assembled steel platform. And S3, pouring a lower concrete pouring layer 3 of the steel platform between the steel platform 1 and the bearing platform 4.
In step S2, the manufacturing of the steel platform 1 includes the following steps: and welding and splicing each super-thick steel plate. And carrying out flatness processing on each welded steel plate. A first Z-shaped lap joint opening 6 is processed on one long side of two steel plates, and a second Z-shaped lap joint opening 7 is processed on two long sides of the other steel plate. And machining bolt holes and exhaust holes, and installing hoisting lugs on the steel plate. Three steel plates are connected in a Z-shaped lap joint mode along the long side direction of the steel plates.
Specifically, the welding and splicing of each super-thick steel plate comprises the following steps: groove processing, steel plate welding and stress relief.
The groove processing specifically comprises the following steps: the upper surface and the lower surface of the welding part of the two ultra-thick plates are subjected to groove processing to be processed into an X structure as shown in figure 3, the angles of the upper groove and the lower groove are 22.5 degrees, the length of the connecting section is 1-2mm, the depth of the upper groove is 100mm, the surfaces of the grooves of the upper surface and the lower surface are mechanically polished to have metallic luster, the welding parts of the two ultra-thick plates are aligned, and the interval between the connecting sections of the two ultra-thick plates is 2-4 mm.
The steel plate welding specifically comprises the following steps: and welding arc striking and extinguishing plates are additionally arranged at two ends of the welding line of the steel plate for 250mm, and welding fixing plates are additionally arranged on the surfaces of the two sides of the welding line of the front side and the back side of the steel plate for 600mm intervals. Preheating the upper slope side of the welding position at 150-180 ℃ by using flame, wherein the preheating width is 150 mm, and backing welding the middle connecting section by using carbon dioxide gas shielded welding. And carrying out submerged-arc welding on the upper groove after backing welding, stopping welding when the welding depth is 45 mm, carrying out slow cooling treatment by adopting heat-insulating cotton, turning over the steel plate after the welding position is cooled, checking whether the weld bead root has a defect, carrying out welding on the defect fully if the defect exists, and polishing the weld bead root to obtain metallic luster if the defect does not exist so as to enable the welding groove to be in smooth transition. Preheating the lower slope side of the welding position at 150-180 ℃ by using flame, carrying out submerged arc welding, stopping welding when the welding depth is 30 mm, carrying out slow cooling treatment by using heat preservation cotton, and turning over the steel plate when the welding position is cooled. Changing the welding depth and repeating the last step for four times, wherein the welding depth of the four times is as follows: and (3) completing the welding of the upper groove at a position 10mm away from the side edge of the upper groove and at a position 3-5 mm away from the side edge of the lower groove, and completing the welding of the lower groove until the welding of the steel plate is completed. The change in weld depth is shown in fig. 4.
The stress relief is specifically as follows: heating the welding line of the steel plate covered by the galvanic couple plate, slowly heating to 550-600 ℃ after heating to 250-300 ℃, keeping the temperature and preserving the heat for 3 hours, and then slowly cooling to room temperature by adopting heat preservation cotton. So as to achieve the purpose of eliminating stress. The stress relief anneal curve is shown in fig. 5.
Specifically, the flatness processing of each welded steel plate includes the flatness processing of the bottom of the steel plate and the flatness processing of the upper end face of the steel plate. And (3) processing the flatness of the bottom of the steel plate: the steel plate is horizontally placed, the large surface is aligned, eight 300X300mm steel column process adjusting planes for installing the steel pillars 2 are machined, the steel column process adjusting planes are locally planed for 5mm, the machining roughness is 12.5um, and the flatness is 0.5mm. And (3) processing the flatness of the upper end face of the steel plate: turning over the steel plate by using a lifting appliance, keeping flat, finely milling the upper end face of the steel plate, and integrally planing, wherein the planing depth is 5 to 10mm, the roughness is 12.5 mu m, and the flatness is 0.2mm, the planing depth of the face opposite to the steel column process adjustment plane is 5mm, the planing depth of the rest positions is 10mm, firstly performing rough machining, and reserving a machining allowance of 0.5mm, so that the large-face flatness is controlled within 0.5mm. And finally, fine machining is carried out to ensure the flatness and the smoothness, and finally, the flatness is confirmed by measuring with a dial indicator.
Specifically, the step of processing a first Z-shaped lap joint opening 6 on one long edge of two steel plates and a second Z-shaped lap joint opening 7 on two long edges of the other steel plate comprises the following steps: one of them long limit of two steel sheets is successively accomplished the finish machining of the chute structure of first Z type overlap joint mouth 6 with rough milling and finish milling, and the depth of processing of the inboard one end of chute structure is greater than the depth of processing of outside one end, adds the processing allowance that remains 1 millimeter to carry out radius angle processing respectively to the closed angle and the interior fillet of the evagination of Z type overlap joint mouth, the roughness is 6.3 um. The above steps are repeated to process the second Z-shaped lap joints 7 on the two long sides of another steel plate. Wherein the depth of the inner side end of the chute structure is 100mm, the depth of the outer side end of the chute structure is 60mm, and the length of the chute structure of the first Z-shaped overlapping port 6 is 1.5mm longer than that of the chute structure of the second Z-shaped overlapping port 7. The sharp corners and the inner corners of the outer protrusions of the Z-shaped lap joints are respectively subjected to fillet treatment, so that the Z-shaped lap joints are not easy to hurt people, and are convenient to install.
Specifically, processing bolt hole and exhaust hole, installation hoist and mount lug includes following step on the steel sheet: and processing bolt holes on the chute structure of the Z-shaped lap joint openings, wherein the bolt holes need to meet the requirement that when the bolt holes are installed, the gap between the outer side edge of the first Z-shaped lap joint opening 6 and the inner side edge of the second Z-shaped lap joint opening 7 is controlled to be 0.5mm, and the gap between the inner side edge of the first Z-shaped lap joint opening 6 and the outer side edge of the second Z-shaped lap joint opening 7 is controlled to be 2mm. And processing a plurality of exhaust holes on the plane of the steel plate. The otic placode welding of hoist and mount lug is on the steel sheet plane to install wire rope on the otic placode, wherein the quantity of otic placode is 4, and wherein 2 otic placodes are apart from left side minor face 3500mm, and two other otic placodes are apart from right side minor face 3500mm, wire rope's length and diagonal angle otic placode's distance phase-match.
In the step S2, the factory pre-assembly and adjustment of the steel platform 1 comprises the following steps: the steel support columns 2 of the factory imitating the construction site are fixed on the assembly ground rail platform, and the height of the steel support columns 2 is preliminarily unified. And (3) placing the two steel plates outside the steel platform 1 on the steel support 2 by using a crane, and finely adjusting the two steel plates to meet the requirements. The Z-shaped overlapping opening of the steel plate in the middle of the steel platform 1 is aligned to the Z-shaped overlapping opening of the two steel plates on the outer side of the steel platform 1 by using a crane, and the steel plate in the middle of the steel platform 1 and the two steel plates on the outer side of the steel platform 1 are connected through bolts and bolt holes in a chute of the Z-shaped overlapping opening. And (3) checking the flatness, dotting and leveling by using a level gauge and an invar ruler, adjusting the steel platform 1 to meet the design requirement by using a hydraulic jack and a leveling bolt, and welding the pre-assembled and adjusted steel platform 1 and a short strut in the steel strut 2.
In the step S2, the step of transporting and installing the steel platform 1 adjusted to meet the requirements comprises the following steps: and (4) splitting the pre-assembled and adjusted steel platform 1, and transporting to a construction site. Two steel plates on the outer side of the steel platform 1 are installed by a crane, and then the steel plate in the middle of the steel platform 1 is installed. Utilize high accuracy surveyor's level and invar chi control elevation, utilize hydraulic jack and pre-buried adjusting bolt to carry out the leveling, after the roughness satisfies the design requirement, pass through high strength bolt fastening with the long post of steel platform 1 and steel pillar 2 to carry out full weld at long steel column top and steel sheet junction, steel column welding back ligature steel platform lower part reinforcing bar.
In the step S3, the step of pouring the lower concrete pouring layer 3 of the steel platform between the steel platform 1 and the bearing platform 4 comprises the following steps: and pouring a lower steel platform concrete pouring layer 3 between the installed steel platform 1 and the bearing platform 4, and plugging the reserved exhaust holes on the steel platform after pouring is finished.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, improvement or the like made within the spirit and principle of the present invention is included in the scope of the claims of the present invention filed as filed.
Claims (7)
1. The mounting and construction method of the large-scale drop test platform is characterized in that the large-scale drop test platform comprises the following steps: the concrete pouring system comprises a steel platform (1), steel pillars (2), a steel platform lower concrete pouring layer (3), a bearing platform (4) and a pile foundation (5);
the bearing platform (4) is arranged above the pile foundation (5), the steel support column (2) is fixedly arranged on the bearing platform (4), the steel platform (1) is arranged above the steel support column (2) and in the center of the bearing platform (4), and the lower concrete pouring layer (3) of the steel platform is arranged between the bearing platform (4) and the steel platform (1);
the steel strut (2) comprises a long strut and a short strut, the long strut and the short strut are both connected with the steel platform (1), and the long strut is connected with the bearing platform (4);
the steel platform (1) comprises three steel plates, and the three steel plates are connected in a Z-shaped lap joint and high-strength bolt fixing mode along the long edge direction of the steel plates;
each steel plate is formed by welding two 160-millimeter-thick ultra-thick plates, wherein a first Z-shaped lap joint opening (6) is formed in one long edge of each of the two steel plates, a second Z-shaped lap joint opening (7) is formed in the other long edge of each of the two steel plates, the first Z-shaped lap joint opening (6) and the second Z-shaped lap joint opening (7) are of a chute structure, the depth of one end of the inner side of the chute structure is larger than that of one end of the outer side of the chute structure, and the length of the chute structure of the first Z-shaped lap joint opening (6) is larger than that of the chute structure of the second Z-shaped lap joint opening (7); the chute structures of the first Z-shaped overlapping port (6) and the second Z-shaped overlapping port (7) are respectively provided with a bolt hole, the plane of the steel plate is provided with an exhaust hole, and the steel plate is provided with a hoisting lug;
the installation and construction method comprises the following steps:
pouring a bearing platform (4) and a pile foundation (5), and installing a long strut of the steel strut (2) on the bearing platform (4);
manufacturing a steel platform (1), carrying out factory pre-assembly and adjustment on the steel platform (1), and transporting the pre-assembled and adjusted steel platform (1) to a field and installing the steel platform;
pouring a lower concrete pouring layer (3) of the steel platform between the steel platform (1) and the bearing platform (4);
wherein, the steel platform (1) comprises the following steps:
welding and splicing each steel plate;
carrying out flatness processing on each welded steel plate;
processing a first Z-shaped lap joint opening (6) on one long side of two steel plates, and processing a second Z-shaped lap joint opening (7) on two long sides of the other steel plate;
processing bolt holes and exhaust holes, and installing hoisting lugs on the steel plate;
connecting three steel plates along the long edge direction thereof in a Z-shaped lap joint manner;
the welding and splicing of each steel plate comprises the following steps:
the upper surface and the lower surface of the welding part of the two ultra-thick plates are subjected to groove machining, the angles of the upper groove and the lower groove are 22.5 degrees, the length of a connecting section is 1-2mm, and the depth of the upper groove is 100 mm;
mechanically grinding the surfaces of the grooves on the upper surface and the lower surface to obtain metallic luster, aligning the welding positions of the two ultra-thick plates, and enabling the connecting sections between the two ultra-thick plates to be spaced by 2-4 mm;
preheating the upper slope side of the welding position at 150-180 ℃ by using flame, wherein the preheating width is 150 mm, and backing welding the middle connecting section by using carbon dioxide gas shielded welding;
carrying out submerged-arc welding on the upper groove after backing welding, stopping welding when the welding depth is 45 mm, carrying out slow cooling treatment by adopting heat-insulating cotton, turning over the steel plate after the part to be welded is cooled, checking whether the root of the welding bead has a defect or not, carrying out welding on the defect if the defect exists, and polishing the root of the welding bead to obtain metallic luster if the defect does not exist so as to enable the welding groove to be in smooth transition;
preheating the lower slope side of the welding position at 150-180 ℃ by using flame, carrying out submerged-arc welding, stopping welding when the welding depth is 30 mm, carrying out slow cooling treatment by using heat-insulating cotton, and turning over a steel plate when the welding position is cooled;
and repeating the previous step for four times by changing the welding depth, wherein the welding depth of the four times is as follows in sequence: completing the welding of the upper groove at a position 10mm away from the side edge of the upper groove and a position 3-5 mm away from the side edge of the lower groove, and completing the welding of the lower groove until the welding of the steel plate is completed;
heating the welding line of the steel plate covered by the galvanic couple plate, heating to 250-300 ℃, slowly heating to 550-600 ℃, keeping the temperature for 3 hours, and then slowly cooling to room temperature by adopting heat insulation cotton.
2. The installation and construction method according to claim 1, wherein the flatness processing of each welded steel plate comprises the steps of:
processing the flatness of the bottom of the steel plate, horizontally placing the steel plate, processing a steel column process adjusting plane for installing the steel strut (2), and planing for 5mm, wherein the roughness is 12.5 mu m, and the flatness is 0.5mm;
and (3) processing the flatness of the upper end face of the steel plate, turning the steel plate by using a lifting appliance and horizontally placing, finely milling the upper end face of the steel plate and planing the whole steel plate, wherein the planing depth is 5-10 mm, the roughness is 12.5um, and the flatness is 0.2mm.
3. The installation and construction method according to claim 2, wherein the step of processing a first Z-shaped lap joint (6) at one of the long sides of two of the steel plates and a second Z-shaped lap joint (7) at the two long sides of the other steel plate comprises the steps of:
finish machining of a chute structure of the first Z-shaped lap joint opening (6) is completed on one long edge of the two steel plates by rough milling and finish milling in sequence, the machining depth of one end of the inner side of the chute structure is larger than that of one end of the outer side of the chute structure, 1 millimeter of machining allowance is reserved during machining, and fillet treatment is respectively carried out on a sharp corner and an inner concave corner of the outer protrusion of the Z-shaped lap joint opening, wherein the roughness is 6.3 mu m;
and repeating the steps to process second Z-shaped lap joints (7) on two long sides of another steel plate.
4. The installation and construction method of claim 3, wherein the step of machining the bolt holes and the exhaust holes and installing the hoisting lugs on the steel plate comprises the following steps:
processing bolt holes on a chute structure of the Z-shaped lap joint opening, wherein the bolt holes meet the condition that when the bolt holes are installed, the gap between the outer side edge of the first Z-shaped lap joint opening (6) and the inner side edge of the second Z-shaped lap joint opening (7) is controlled to be 0.5mm, and the gap between the inner side edge of the first Z-shaped lap joint opening (6) and the outer side edge of the second Z-shaped lap joint opening (7) is controlled to be 2 mm;
processing a plurality of exhaust holes on the plane of the steel plate;
and welding the lug plate of the lifting lug on the plane of the steel plate, and installing a steel wire rope on the lug plate.
5. Installation and construction method according to claim 4, characterised in that said factory pre-assembling and adjusting of said steel platform (1) comprises the following steps:
fixing the steel support columns (2) of a factory imitating a construction site on an assembly ground rail platform, and preliminarily unifying the height of the steel support columns (2);
two steel plates on the outer side of the steel platform (1) are placed on the steel support (2) by a crane;
aligning a Z-shaped lap joint opening of the steel plate in the middle of the steel platform (1) with Z-shaped lap joint openings of the two steel plates on the outer side of the steel platform (1) by using a crane, and connecting the steel plate in the middle of the steel platform (1) with the two steel plates on the outer side of the steel platform (1) through bolts and bolt holes on a chute of the Z-shaped lap joint openings;
the flatness is checked, a leveling instrument and an invar ruler are used for dotting and leveling, and a hydraulic jack and a leveling bolt are used for adjusting the steel platform (1) to meet the design requirement;
and welding the pre-assembled and adjusted steel platform (1) with a short strut in the steel strut (2).
6. Installation and construction method according to claim 5, characterised in that said transportation and installation of the pre-assembled adjusted steel platform (1) comprises the following steps:
splitting the pre-assembled and adjusted steel platform (1) and transporting the steel platform to a construction site;
firstly installing two steel plates on the outer side of the steel platform (1) by using a crane, and then installing a steel plate in the middle of the steel platform (1);
the elevation is controlled by a high-precision level gauge and an invar ruler, leveling is carried out by a hydraulic jack and pre-embedded adjusting bolts, and after the flatness meets the design requirements, the steel platform (1) and the steel support (2) are fixed through high-strength bolts.
7. Installation and construction method according to claim 6, characterised in that said casting of the lower concrete casting layer (3) of the steel platform between said steel platform (1) and said bearing platform (4) comprises the following steps:
and pouring a lower concrete pouring layer (3) of the steel platform between the installed steel platform (1) and the bearing platform (4), and plugging the reserved exhaust holes on the steel platform after pouring is finished.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101787736A (en) * | 2010-03-09 | 2010-07-28 | 中铁建设集团有限公司 | Steel structure hoisting slide support seat with large span and construction process thereof |
| CN101858139A (en) * | 2010-06-22 | 2010-10-13 | 中国核工业华兴建设有限公司 | Concrete casting platform |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20150117757A (en) * | 2014-04-10 | 2015-10-21 | 한전원자력연료 주식회사 | Drop tester and angle adjuster for the drop tester |
| CN204343604U (en) * | 2014-12-05 | 2015-05-20 | 智房科技股份有限公司 | Cladding panel |
| CN105004501A (en) * | 2015-07-27 | 2015-10-28 | 无锡吉兴汽车声学部件科技有限公司 | Dropping impact test platform |
| CN207163689U (en) * | 2017-09-22 | 2018-03-30 | 成都信息工程大学 | A kind of die casting intensity detecting device |
| CN107764498B (en) * | 2017-10-20 | 2019-11-22 | 清华大学 | A kind of Nuclear Power Station's Exhausted Fuels storage falling from high altitude pilot system |
| CN207332182U (en) * | 2017-10-25 | 2018-05-08 | 深圳市胜德意建筑资源科技有限公司 | Lightweight wall plate and its bridging arrangement |
| CN211848680U (en) * | 2019-12-03 | 2020-11-03 | 交通运输部公路科学研究所 | Steel plate structure and steel plate pavement structure |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101787736A (en) * | 2010-03-09 | 2010-07-28 | 中铁建设集团有限公司 | Steel structure hoisting slide support seat with large span and construction process thereof |
| CN101858139A (en) * | 2010-06-22 | 2010-10-13 | 中国核工业华兴建设有限公司 | Concrete casting platform |
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