Disassembly and combination installation construction method for overhead steel vestibule of open pit slope

Abstract

The invention discloses an open pit side slope overhead steel vestibule decomposition and combined installation construction method which comprises the steps that a side slope step platform channel and hoisting conditions are surveyed, an operation platform meeting transportation and hoisting machinery passing is selected, a long-distance overhead steel vestibule is decomposed into a plurality of single portals and connecting beams, the distance between the single portals is smaller than or equal to 6 m, and the distance between the single portals is smaller than or equal to 6 m; corresponding portal foundations are additionally arranged, a hoisting machine with the tonnage smaller than or equal to 130 t is adopted, the single portals are sequentially hoisted, positioned and fixed, connecting beams are installed in the air to connect the adjacent single portals, a vestibule frame is expanded section by section, longitudinal secondary beams and platform plates at the bottom of the vestibule are installed, and wall face purlines and roof purlines are installed. According to the construction method, the overhead vestibule is determined to be decomposed through on-site detailed investigation and vestibule structural form analysis, the overhead long-section vestibule is decomposed into a portal and connecting beam form, the structural form is simple, the weight of components is light, integral combination can be achieved after single components are installed, component transportation and hoisting operation is facilitated, and the construction efficiency is improved. And hoisting machinery can be selected more flexibly.

Description

Technical Field

[0001] The invention relates to the technical field of open pit mine slope overhead steel corridors, and in particular to a decomposition and assembly installation construction method for open pit mine slope overhead steel corridors. Background Art

[0002] The slope of the open-pit mine is stepped, with a height difference of approximately 30 meters between each step. After prolonged blasting and excavation, the passages between the steps are no longer accessible. To address these accessibility issues, the steel corridors along the mine slope are constructed using both overhead and ground-level configurations. Ground-level portal frames are used where access is available, while overhead trusses are used where access is not. The corridors are designed to have a slope of 14°. The step platforms are narrow, leaning against the mountain on one side and completely suspended on the other. Only a few steps provide access for vehicles and cranes, forcing transportation to be conducted within the limited construction corridors. This restricts crane positioning when lifting components, resulting in a long lifting radius and a large lifting machine. The overhead corridors are particularly long and heavy, making transportation and lifting operations extremely difficult. Summary of the Invention

[0003] The object of the present invention is to solve one of the above-mentioned technical problems at least to a certain extent.

[0004] To this end, the purpose of the present invention is to propose a method for decomposing and assembling an overhead steel corridor on the slope of an open-pit mine. Through detailed on-site investigation and analysis of the corridor structure, it is determined that the overhead corridor is decomposed, and the long overhead corridor is decomposed into a gantry plus connecting beam form. Its structural form is simple and the components are light in weight. After the individual components are installed, they can be assembled as a whole, which facilitates the transportation and lifting operations of the components and allows for more flexible selection of lifting machinery.

[0005] To achieve the above-mentioned object, one embodiment of the present invention provides a method for disassembling and assembling an overhead steel corridor on an open pit slope, comprising the following steps:

[0006] Step S1: Survey the slope step platform passage and hoisting conditions, and select an operating platform that can accommodate transportation and hoisting machinery;

[0007] Step S2: Decompose the long overhead steel corridor into multiple independent single portal frames and connecting beams, wherein the spacing between multiple independent single portal frames is ≤ 6m, and add corresponding portal frame foundations;

[0008] Step S3, using a lifting machine with a tonnage of ≤130t to sequentially lift and position the single portal frames;

[0009] Step S4, installing the connecting beam in the air to connect the adjacent single portals to form a stable frame structure;

[0010] Step S5, repeating steps S3-S4 to expand the corridor framework section by section;

[0011] Step S6: Install the longitudinal secondary beams and platform plates at the bottom of the corridor and complete welding;

[0012] Step S7: Install wall purlins and roof purlins to complete the overall corridor construction.

[0013] According to one embodiment of the present invention, the work platform in step S1 includes: a component transportation platform and a lifting work platform, and the lifting machinery needs to meet the passage requirement of a slope gradient of ≤14°.

[0014] According to one embodiment of the present invention, the component transportation platform is a -18m platform, and the hoisting operation platform is a -42m platform.

[0015] According to one embodiment of the present invention, the single portal frame in step S2 is a single-piece steel structure, and its weight is ≤ the rated lifting capacity of the lifting machinery at the maximum operating radius.

[0016] According to one embodiment of the present invention, the hoisting machine in step S3 is a truck crane, the truck crane is selected to be 130t class, and the hoisting radius of the single gantry during hoisting is ≤20m.

[0017] According to one embodiment of the present invention, in step S4, the connecting beam and the single portal frame are connected by high-strength bolts or welded on-site to form a rigid frame node.

[0018] According to one embodiment of the present invention, the longitudinal secondary beam in step S6 is installed in sections, the section lengths match the door frame spacing, and the platform plate is laid on-site using corrugated steel plates.

[0019] According to one embodiment of the present invention, an anti-slip anchoring device is provided at the bottom of the column of the single portal frame, and the foundation adopts an extended concrete independent foundation.

[0020] According to one embodiment of the present invention, the overall frame needs to be monitored for displacement after installation, and the allowable displacement deviation is ≤H / 1000; wherein H is the mast height.

[0021] According to one embodiment of the present invention, the construction method is applicable to restricted site conditions where the width of the slope step platform is ≤8m and there is no support on the suspended side.

[0022] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned through practice of the present invention.

[0023] Compared with the prior art, the beneficial effects of the embodiments of the present application are:

[0024] The present invention provides a method for decomposing and assembling an overhead steel corridor on the slope of an open-pit mine. Through detailed on-site investigation and analysis of the corridor structure, it is determined that the overhead corridor is to be decomposed, and the long overhead corridor is decomposed into a form of a portal frame plus a connecting beam. The structure is simple and the components are light. After the individual components are installed, they can be assembled as a whole, which facilitates the transportation and lifting operations of the components and allows for more flexible selection of lifting machinery.

[0025] The present invention provides a method for disassembling and assembling an overhead steel corridor on the slope of an open-pit mine, which converts a long corridor into a simple portal frame plus connecting beams, simplifies the complex structure of the original steel corridor, eliminates the need to manufacture trusses and assemble the upper and lower chords of the corridor, solves the difficulties of long-distance corridors or on-site assembly, and reduces transportation costs.

[0026] The present invention provides a method for disassembling and assembling an overhead steel corridor on the slope of an open-pit mine. The weight of the portal frame and the connecting beam is greatly reduced compared with the previous integral corridor, and a large-tonnage crawler crane is no longer needed, which greatly saves costs and the time for on-site assembly of crawler cranes. Construction can be carried out quickly and the construction period is advanced.

[0027] The invention provides a decomposition and assembly installation construction method for an overhead steel corridor on the side slope of an open-pit mine. The overall structure does not change the stress state of components, is simple to manufacture, and is quick to install.

[0028] The present invention provides a method for decomposing and assembling an overhead steel corridor on the slope of an open-pit mine. The method has sufficient theoretical basis and ingenious conception, and has promotional value in the construction of overhead steel corridors under steep slope conditions or poor site conditions.

[0029] The present invention provides a method for disassembling and assembling an overhead steel corridor on the slope of an open-pit mine. By using this method, the corridor is disassembled as a whole, which is convenient to transport and simple to install. After the portal frame and the connecting beam are assembled and installed on site, the overall stability is good, the construction efficiency is greatly improved, and the construction cost is greatly reduced.

[0030] To better understand the technical means of the present invention and to facilitate implementation in accordance with the description, and to make the above-mentioned and other purposes, features, and advantages of the present invention more readily apparent, preferred embodiments are described below in detail with reference to the accompanying drawings. Other features and advantages of the present invention will be explained in the subsequent description and, in part, will become apparent from the description or be demonstrated through the practice of the present invention. The purposes and other advantages of the present invention may be achieved and attained through the structures particularly noted in the description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 This is a flow chart of a method for disassembling and assembling an overhead steel corridor for an open pit slope according to an embodiment of the present invention;

[0033] Figure 2 This is a schematic diagram of the structure of an overhead steel corridor before decomposition in a method for decomposing and assembling an open pit mine slope according to an embodiment of the present invention;

[0034] Figure 3 1. It is a schematic diagram of the structure of the decomposed corridor of the open pit slope overhead steel corridor provided in accordance with an embodiment of the present invention;

[0035] Figure 4 The present invention is a schematic diagram of a gantry structure for a method of disassembling and assembling an overhead steel corridor on an open-pit mine slope according to an embodiment of the present invention. DETAILED DESCRIPTION

[0036] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0037] The slope of the open-pit mine is stepped, with a height difference of approximately 30 meters between each step. After prolonged blasting and excavation, the passages between the steps are no longer accessible. To address these accessibility issues, the steel corridors along the mine slope are constructed using both overhead and ground-level configurations. Ground-level portal frames are used where access is available, while overhead trusses are used where access is not. The corridors are designed to have a slope of 14°. The step platforms are narrow, leaning against the mountain on one side and completely suspended on the other. Only a few steps provide access for vehicles and cranes, forcing transportation to be conducted within the limited construction corridors. This restricts crane positioning when lifting components, resulting in a long lifting radius and a large lifting machine. The overhead corridors are particularly long and heavy, making transportation and lifting operations extremely difficult.

[0038] In order to solve this problem, the present invention proposes a decomposition and assembly installation construction method for an overhead steel corridor on the slope of an open-pit mine.

[0039] Specifically, a method for disassembling and assembling an overhead steel corridor on an open-pit mine slope according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0040] Figure 1 This is a flow chart of a method for disassembling and assembling an overhead steel corridor for an open pit slope provided by one embodiment of the present invention. Figure 2 This is a schematic diagram of the structure of an overhead steel corridor on an open pit slope provided by an embodiment of the present invention, according to which the construction method for disassembling and assembling the corridor is provided. Figure 3 This is a schematic diagram of the decomposed corridor structure of an open pit slope overhead steel corridor according to an embodiment of the present invention, Figure 4 The present invention is a schematic diagram of a gantry structure for a method of disassembling and assembling an overhead steel corridor on an open-pit mine slope according to an embodiment of the present invention.

[0041] Please refer to Figures 1-4 This embodiment provides a method for disassembling and assembling an overhead steel corridor on an open pit slope, which includes the following steps:

[0042] Step S1: Survey the slope step platform passage and hoisting conditions, and select an operating platform that can accommodate transportation and hoisting machinery;

[0043] Among them, a 3D laser scanner is used to map the slope terrain, a BIM model is established to simulate the lifting path, and the coordinate positioning of the -18m platform (main transportation channel) and the -42m platform (main lifting area) are determined. The platform bearing capacity must be ≥15t / m 2 .

[0044] Step S2: Decompose the long overhead steel corridor into multiple independent single portal frames and connecting beams, wherein the spacing between multiple independent single portal frames is ≤ 6m, and add corresponding portal frame foundations;

[0045] Among them, the original 60-100m long integral truss corridor (weighing 80-120t) is decomposed into a single-piece portal frame weighing ≤8t (H-shaped steel section 400×400×12×20mm) and a connecting beam weighing ≤3t (box section 300×200×10mm). The portal frame spacing is strictly controlled between 5.5-6m, and the portal frame foundation size is expanded to 2.5×2.5×1.8m (the original foundation was 1.5×1.5m).

[0046] Step S3, using a lifting machine with a tonnage of ≤130t to sequentially lift and position the single portal frames;

[0047] Among them, a 130t truck crane (such as XCMG XCA130L8) is used, and the operation is carried out under the conditions of lifting radius ≤ 18m and lifting height ≥ 35m. The verticality of the gantry is adjusted by a laser theodolite (accuracy 0.1mm / m).

[0048] Step S4, installing the connecting beam in the air to connect the adjacent single portals to form a stable frame structure;

[0049] Among them, the progressive construction method is to install two door frames → connect the connecting beams → form a stable unit → expand the next unit, and a 20mm expansion joint is reserved between the units.

[0050] Step S5, repeating steps S3-S4 to expand the corridor framework section by section;

[0051] Step S6: Install the longitudinal secondary beams and platform plates at the bottom of the corridor and complete welding;

[0052] Among them, the longitudinal secondary beam is hoisted in sections using H250×125×6×9 steel, and the platform plate is made of 4mm thick corrugated steel plate YX75-230-690, which is laid and then poured with a 50mm thick C30 fine stone concrete surface layer.

[0053] Step S7: Install wall purlins and roof purlins to complete the overall corridor construction.

[0054] The above steps solved the problem of overweight lifting. Specifically, the weight of a single unit was reduced by 90% (from 120t to 8t), making it possible to replace a 280t crawler crane with a 130t truck crane, saving 45% in equipment costs (the shift rate for a 280t crawler crane is approximately 32,000 yuan per shift vs. 18,000 yuan per shift for a 130t truck crane). Spatial limitations were overcome. Specifically, the truck crane is only 3.2m wide (compared to 4.8m for a crawler crane), allowing it to operate on narrow platforms with a width of ≥4m (previously ≥6m). The construction period was shortened, eliminating factory assembly and special transportation of the entire corridor (previously requiring an overweight transportation permit, which took 15-20 days). On-site installation efficiency was increased to 40m / day (previously only 10m / day for overall lifting). A safe and controllable structure was achieved, and the instability of the cantilever structure was reduced by unit installation. The measured displacement after the frame was formed was ≤12mm (when H = 12m), far below the regulatory limit of H / 250 = 48mm.

[0055] An embodiment of the present invention provides a method for decomposing and assembling an overhead steel corridor on the slope of an open-pit mine. Through detailed on-site investigation and analysis of the corridor structure, it is determined that the overhead corridor is to be decomposed, and the long overhead corridor is decomposed into a gantry plus connecting beams. The structure is simple and the components are light. After the individual components are installed, they can be assembled as a whole, which facilitates the transportation and lifting operations of the components and allows for more flexible selection of lifting machinery.

[0056] In one embodiment of the present invention, the work platform in step S1 includes: a component transport platform and a hoisting work platform, and the hoisting machinery must meet the requirement of a slope gradient of ≤14°. The component transport platform is a -18m platform, and the hoisting work platform is a -42m platform.

[0057] It should be noted that the -18m transport platform serves as the logistics hub, with a circular channel of ≥6m width, using 20t flatbed trucks to transport components, with a turning radius of ≥15m and a slope of ≤8%. The -42m lifting platform is compacted and hardened (300mm thick graded crushed stone + 200mm thick C20 concrete), with a load capacity of ≥20t / m 2 A 10×2m roadbed box was laid beneath the crane outriggers to spread the load. The truck crane has a climbing capacity of 14° (the crawler crane has a climbing capacity of only 10°). The hydraulic outriggers are equipped with a slope compensation system, allowing them to operate directly on slopes with an inclination of 5° or less. Steel plates are used for leveling when the inclination is greater than 5°.

[0058] Through the above steps, logistics efficiency was improved. Specifically, the dual-platform division of labor reduced component transfer time to 15 minutes per piece (the original plan required 1 hour), and vehicle fuel consumption was reduced by 40%. Safety was enhanced by eliminating the need for cranes to move on steep slopes (the original crawler crane had to crawl on a slope, with a 0.8% risk of overturning), and the accident rate dropped to 0.1%. Cost savings were achieved, and the amount of platform expansion work was reduced (the original widening required 8 meters, now only 6 meters), and the amount of earthwork was reduced by 800m. 3 , saving 320,000 yuan in costs.

[0059] In one embodiment of the present invention, the single portal frame in step S2 is a single-piece steel structure, and its weight is ≤ the rated lifting capacity of the hoisting machinery at the maximum operating radius.

[0060] It should be noted that the portal frame adopts a variable cross-section design (column base 400×400→column top 300×300), and the steel consumption is reduced from 1.2t / frame to 0.9t / frame; based on the crane performance curve (130t crane has a lifting capacity of 9.8t at a radius of 18m), the weight of a single portal frame is limited to ≤8t (safety factor 1.225); and the bolt hole groups of the portal frame column-beam connecting plate are batch-processed by CNC drilling machines, and the hole spacing deviation is ≤0.5mm.

[0061] Through the above steps, lifting safety was achieved, specifically, the lifting weight / component weight ratio was ≥1.2, eliminating the risk of overloading (the original ratio was only 0.9); material costs were reduced, specifically, the total steel consumption of the corridor was reduced by 15% (from 420t to 357t), saving 630,000 yuan in steel costs (calculated at 5,000 yuan / t); installation accuracy was improved, specifically, the standardized components made the center positioning error of the portal column foot ≤3mm (the original on-site cutting error was 10mm).

[0062] In one embodiment of the present invention, the hoisting machine in step S3 is a truck crane, the truck crane is 130t class, and the hoisting radius of the single gantry crane is ≤20m.

[0063] It should be noted that a 130t all-terrain truck crane is selected, with a main arm length of 42.5m (the operating height covers a 40m deep mine), a counterweight of 40t, and an outrigger span of 8.1×8.1m; the lifting capacity is ≥9t when the lifting radius is ≤20m, and the actual control is within 18m; the gantry lifting time is ≤25 minutes / frame (including positioning and fixing); the outrigger hydraulic leveling system response time is <3 seconds, and the horizontality is maintained at ≤0.5°.

[0064] Through the above steps, a breakthrough in economic efficiency was achieved, efficiency was optimized, and energy was saved. Specifically, the equipment shift cost was reduced by 44% (130t crane 18,000 yuan / shift vs 280t crawler crane 32,000 yuan / shift).

[0065] The total lifting cost was saved by RMB 1.12 million (based on a 60-day construction period); the transfer efficiency was three times higher than that of a crawler crane (a truck crane only takes 0.5 hours to transfer, while a crawler crane takes 1.5 days to install and disassemble); the diesel consumption was 28L / h (crawler crane is 52L / h), saving 34,560 liters of fuel in a 60-day construction period.

[0066] In one embodiment of the present invention, the connecting beam and the single portal frame in step S4 are connected by high-strength bolts or welded on site to form a rigid frame node.

[0067] It should be noted that the bolt connection uses 10.9 grade M24 high-strength bolts (pre-tension 225kN), and the contact surface of the connecting plate is sandblasted (friction coefficient ≥ 0.45); when the bolt installation space is insufficient, CO2 gas shielded welding (welding wire ER50-6, weld grade 2) is used; triangular stiffening ribs (thickness 12mm) are welded at the end of the connecting beam to increase the node's bending resistance by 30%.

[0068] Through the above steps, structural stability, construction convenience and quality control were achieved. Specifically, the node stiffness was increased to 85% of the overall corridor, and the displacement angle under earthquake conditions was ≤1 / 300 (the standard limit is 1 / 250); the bolt connection made the installation time of a single connecting beam ≤20 minutes (welding required 1.5 hours); the first-time pass rate of non-destructive testing was ≥98% (the original on-site welding pass rate was only 90%).

[0069] In one embodiment of the present invention, the longitudinal secondary beam in step S6 is installed in sections, the section length matches the door frame spacing, and the platform plate is laid on site using corrugated steel plates.

[0070] It should be noted that the length of the secondary beam segment = the door frame spacing - 20mm (reserving temperature difference deformation allowance), and the corbel lap length at both ends is ≥150mm; the platform plate is further optimized to a corrugated steel plate with a wave height of 75mm, a yield strength of 350MPa, a transverse lap length ≥200mm, and a self-tapping screw spacing ≤300mm.

[0071] Through the above steps, the installation efficiency is improved, specifically, the secondary structure construction speed reaches 120 m 2 / day (the original overall laying is only 50 m 2 / day) ; the durability is improved, specifically, the combined floor stiffness is improved by 40%, and the vibration acceleration is less than or equal to 0.5 m / s 2 (satisfying the human comfort requirement) ; and the single platform plate can be disassembled and replaced (the original corridor needs to be integrally repaired). In an embodiment of the present application, the anti-sliding anchoring device is arranged at the bottom of the column of the single gantry, and the foundation adopts an extended concrete independent foundation.

[0072] It should be noted that the column foot of the anchoring device is provided with 4 M42 foundation bolts (with a buried depth of 1.2 m), and the anchor plate has a size of 400*400*30 mm; the independent foundation has a size of 2.5*2.5*1.8 m, is provided with double-layer and double-direction Φ16@150 reinforcement, and has a coefficient of anti-sliding of concrete of greater than or equal to 0.4; the foundation periphery is provided with a drainage ditch (200*200 mm) to avoid accumulated water softening the foundation.

[0073] Through the above steps, the foundation anti-sliding force is greater than or equal to 120 kN (the sliding force of the slope body is 80 kN), the safety factor is 1.5, the foundation settlement is less than or equal to 5 mm (the monitoring period is 30 days), and the differential settlement is less than 2 mm; the corrosion-resistant coating (epoxy coal tar paint + glass cloth three cloth five oil) has the beneficial effect of prolonging the service life of the foundation to 30 years. In an embodiment of the present application, displacement monitoring is required after the overall frame is installed, and the allowable deviation of displacement is less than or equal to H / 1000; wherein H is the height of the gantry.

[0074] It should be noted that the monitoring system adopts a combination of an inclination sensor (with a precision of 0.001°) and a total station instrument (with a ranging precision of 1 mm+1ppm) for monitoring; the control standard is that the displacement limit value Δ is less than or equal to H / 1000 and less than or equal to 20 mm (when H=12 m, Δ≤12 mm) ; real-time data is uploaded to a cloud platform, and automatic alarm is performed when the displacement amount is greater than 8 mm.

[0075] Through the above steps, risk control, data traceability and reduction of manual work are achieved, specifically, millimeter-level control of structure deformation is achieved (the original scheme only has visual inspection) ; a displacement-time curve diagram is generated to guide subsequent unit construction; the number of monitoring personnel is reduced from 6 to 2, and the efficiency is improved by 300%. In an embodiment of the present application, the construction method is suitable for a restricted site condition that the width of the slope step platform is less than or equal to 8 m and the unsupported side has no support.

[0076] It should be noted that the platform width is 4-8 m (the limit value is 4 m), the slope gradient is 14°-25°, and the overhanging height is 30-50 m. When the width is less than or equal to 5 m, a folding arm type truck crane (with an operation width of 3 m) is used; when the gradient is greater than 18°, a temporary lattice column support is additionally arranged.

[0077] The above steps solve the problem of narrow and steep slope sites that cannot be constructed using traditional methods (applicable to 30% of open-pit mines worldwide); facilitate rapid reconstruction after disasters (for example, construction can still be carried out when the passage is interrupted by a landslide); reduce the amount of slope excavation, and protect more than 80% of native vegetation.

[0078] The present invention provides a method for disassembling and assembling an overhead steel corridor on an open pit slope. The specific operation method is as follows:

[0079] First, survey the passages around the overhead corridor and the hoisting positions, determine the -18m platform as the component transportation route and the hoisting machinery passage route, and the -42m platform for hoisting operations. Figure 1 As shown in the figure. Due to the heavy weight and length of the overhead corridor, the platform's spatial location limited the large lifting radius, and the lifting machinery needed to navigate up and down the slope, only crawler cranes with a capacity of 280t or more could be used. Secondly, because the platform width did not meet the crawler crane's inherent width requirements, the corridor could not be hoisted. Given the limitation of being unable to change the lifting radius, the only option was to use a smaller tonnage hoisting machinery, allowing the hoisting machinery to fit within the platform width. Therefore, the corridor was disassembled to minimize the lifting weight of individual components and meet the lifting requirements of the hoisting machinery.

[0080] Secondly, 3. Decompose the corridor as a whole, breaking down the long corridor into single gantries and tie beams with spacing no more than 6m. Add the corresponding gantries foundations, and use a 130t truck crane to complete the lifting operation. First, hoist the two single gantries, adjust and secure them in place, and then install the tie beams in the air. Once a stable frame structure is formed, install the gantries and tie beams one by one, moving forward to complete the entire corridor installation.

[0081] Finally, after all the corridor frames are assembled, the longitudinal secondary beams and platform plates at the bottom of the corridor are hoisted into place and welded as required. The wall and roof purlins are then installed, and the entire corridor is complete.

[0082] The present invention provides a method for decomposing and assembling an overhead steel corridor on an open pit slope, and the beneficial effects thereof are as follows:

[0083] The present invention provides a method for decomposing and assembling an overhead steel corridor on the slope of an open-pit mine. Through detailed on-site investigation and analysis of the corridor structure, it is determined that the overhead corridor is to be decomposed, and the long overhead corridor is decomposed into a form of a portal frame plus a connecting beam. The structure is simple and the components are light. After the individual components are installed, they can be assembled as a whole, which facilitates the transportation and lifting operations of the components and allows for more flexible selection of lifting machinery.

[0084] The present invention provides a method for disassembling and assembling an overhead steel corridor on the slope of an open-pit mine, which converts a long corridor into a simple portal frame plus connecting beams, simplifies the complex structure of the original steel corridor, eliminates the need to manufacture trusses and assemble the upper and lower chords of the corridor, solves the difficulties of long-distance corridors or on-site assembly, and reduces transportation costs.

[0085] The present invention provides a method for disassembling and assembling an overhead steel corridor on the slope of an open-pit mine. The weight of the portal frame and the connecting beam is greatly reduced compared with the previous integral corridor, and a large-tonnage crawler crane is no longer needed, which greatly saves costs and the time for on-site assembly of crawler cranes. Construction can be carried out quickly and the construction period is advanced.

[0086] The invention provides a decomposition and assembly installation construction method for an overhead steel corridor on the side slope of an open-pit mine. The overall structure does not change the stress state of components, is simple to manufacture, and is quick to install.

[0087] The present invention provides a method for decomposing and assembling an overhead steel corridor on the slope of an open-pit mine. The method has sufficient theoretical basis and ingenious conception, and has promotional value in the construction of overhead steel corridors under steep slope conditions or poor site conditions.

[0088] The present invention provides a method for disassembling and assembling an overhead steel corridor on the slope of an open-pit mine. By using this method, the corridor is disassembled as a whole, which is convenient to transport and simple to install. After the portal frame and the connecting beam are assembled and installed on site, the overall stability is good, the construction efficiency is greatly improved, and the construction cost is greatly reduced.

[0089] The above description is merely a preferred embodiment of the present invention and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of disclosure involved in the present invention is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also includes other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the above-mentioned disclosed concepts. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in the present invention.

[0090] In addition, although adopting specific order to describe each operation, this should not be interpreted as requiring these operations to be executed in the specific order shown or in sequential order.Under certain environment, multitasking and parallel processing may be advantageous.Similarly, although comprising some specific implementation details in the above discussion, these should not be interpreted as limiting the scope of the present invention.Some features described in the context of independent embodiment can also be implemented in single embodiment in combination.On the contrary, the various features described in the context of independent embodiment also can be implemented in multiple embodiments individually or in the mode of any suitable subcombination.

[0091] Although the subject matter has been described in language specific to structural features and / or methodological acts, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.

[0092] Finally, it should be noted that only the preferred embodiments of the present application have been described, and that all modifications and variations are possible within the scope of the present application as defined in the following claims.

Claims

1. A method for disassembling and assembling an overhead steel corridor on the slope of an open pit mine, characterized in that: The steps include: Step S1: Survey the slope step platform passage and hoisting conditions, and select an operating platform that can accommodate transportation and hoisting machinery; Step S2: Decompose the long overhead steel corridor into multiple independent single portal frames and connecting beams, wherein the spacing between multiple independent single portal frames is ≤ 6m, and add corresponding portal frame foundations; Step S3, using a lifting machine with a tonnage of ≤130t to sequentially lift and position the single portal frames; Step S4, installing the connecting beam in the air to connect the adjacent single portals to form a stable frame structure; Step S5, repeating steps S3-S4 to expand the corridor framework section by section; Step S6: Install the longitudinal secondary beams and platform plates at the bottom of the corridor and complete welding; Step S7: Install wall purlins and roof purlins to complete the overall corridor construction.

2. The method for disassembling and assembling the overhead steel corridor on the slope of an open pit mine according to claim 1 is characterized in that: The working platform in step S1 includes: a component transportation platform and a lifting working platform, and the lifting machinery must meet the passage requirement of a slope gradient of ≤14°.

3. The method for disassembling and assembling the overhead steel corridor on the slope of an open pit mine according to claim 2 is characterized in that: The component transportation platform is a -18m platform, and the hoisting operation platform is a -42m platform.

4. The method for disassembling and assembling the overhead steel corridor on the slope of an open pit mine according to claim 1 is characterized in that: The single portal frame in step S2 is a single-piece steel structure, and its weight is less than or equal to the rated lifting capacity of the hoisting machinery at the maximum operating radius.

5. The method for disassembling and assembling the overhead steel corridor on the slope of an open pit mine according to claim 1 is characterized in that: The hoisting machine in step S3 is a truck crane, the truck crane is selected to be 130t class, and the hoisting radius of the single gantry is ≤20m during hoisting.

6. The method for disassembling and assembling the overhead steel corridor on the slope of an open pit mine according to claim 1 is characterized in that: In step S4, the connecting beam and the single portal frame are connected by high-strength bolts or welded on site to form a rigid frame node.

7. The method for disassembling and assembling the overhead steel corridor on the slope of an open pit mine according to claim 1 is characterized in that: The longitudinal secondary beam in step S6 is installed in sections, and the section length matches the door frame spacing. The platform plate is laid on site using corrugated steel plates.

8. The method for disassembling and assembling the overhead steel corridor on the slope of an open pit mine according to claim 1 is characterized in that: An anti-slip anchoring device is provided at the bottom of the column of the single door frame, and the foundation adopts an extended concrete independent foundation.

9. The method for disassembling and assembling the overhead steel corridor on the slope of an open pit mine according to claim 1 is characterized in that: After the overall frame is installed, displacement monitoring is required, and the allowable displacement deviation is ≤H / 1000; where H is the gantry height.

10. The method for disassembling and assembling the overhead steel corridor on the slope of an open pit mine according to any one of claims 1 to 9, characterized in that: The construction method is applicable to restricted site conditions where the width of the slope step platform is ≤8m and there is no support on the suspended side.

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