A method of installing a monolithic electrically powered lifting device mounted steel silo

Abstract

The application provides a method for installing a whole electric lifting device steel plate silo, according to a foundation ring plate embedded in a bottom of the silo, an inner edge line of a wall plate is determined; according to the inner edge line of the wall plate, a plurality of triangular steel plates are fixed on the foundation ring plate to form a limiting ring, and the limiting ring is used for bearing a section wall plate; wherein the bottom of the wall plate is connected with the triangular steel plate through a wedge-shaped spacer; a top truss of the silo is installed, a top plate of the silo is fixedly connected with a first section wall plate, and the first section wall plate and the top plate fixed together are simultaneously lifted by an electric chain electric hoist; after being lifted to a first set height, a second section wall plate is fixedly connected with the first section wall plate, after the fixing is completed, the first section wall plate, the second section wall plate and the top plate are lifted to a second set height again to install a next section wall plate, until all the section wall plates are fixedly installed; after all the section wall plates are fixedly installed, the section wall plates and the top plate are simultaneously lowered to the silo, and a wedge-shaped spacer of a last section wall plate is fixedly connected with a triangular steel plate; the application ensures that the wall plate matches with a middle line of an upper portion of the foundation ring plate, so that an outer shape size of the silo and an allowable deviation are located in a set range, and the construction precision is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power engineering, and in particular to a method for installing a steel plate silo with an integral electric lifting device. Background Art

[0002] The statements in this section merely provide background art related to the present invention and do not necessarily constitute prior art.

[0003] Thermal power plants are equipped with steel silos for ash storage. Conventional methods involve manually lifting them with a chain hoist, which is time-consuming, labor-intensive, and inefficient. Electric hoists can automate the inverted installation of steel silos.

[0004] Specific existing automation control strategies include: controlling multiple electric hoists simultaneously through a console so that the expansion rings hanging on the lower hooks of the electric hoists can be raised or stopped uniformly to complete the lifting process in the inverted installation method of cylindrical steel storage tanks;

[0005] However, the existing automation control strategy has the following problems:

[0006] (1) When using an automated lifting solution, it is often impossible to match the center line of the wall panel with the upper center line of the foundation ring plate during hoisting, welding and installation, which may cause the deviation between the outer dimensions of the warehouse and the allowable deviation to exceed the set value;

[0007] (2) When performing electric lifting control and welding control, it is necessary to ensure the consistency of lifting of each electric hoist and the consistency of welding installation. The existing control strategy needs to stop each time to detect the uniformity of force of each electric hoist, which has low construction efficiency. Summary of the Invention

[0008] In order to address the shortcomings of the existing technology, the present invention provides a method for installing a steel plate silo with an integral electric lifting device, which ensures the matching of the wall panel and the upper center line of the foundation ring plate, so that the external dimensions of the warehouse body and the allowable deviation are within the set range, thereby ensuring the accuracy of construction.

[0009] In order to achieve the above object, the present invention adopts the following technical solutions:

[0010] A method for installing a steel plate silo using an integral electric lifting device includes at least the following steps:

[0011] Determine the inner edge of the wall panel based on the pre-buried foundation ring plate at the bottom of the reservoir;

[0012] According to the inner edge of the wall panel, multiple triangular steel plates are fixed around the base ring plate to form a limiting ring, which is used to support the segmented wall panel; wherein, the bottom of the wall panel is in contact with the triangular steel plate through a wedge-shaped washer;

[0013] Install the roof truss, connect the roof plate to the first section wall plate, and lift the first section wall plate and roof plate fixed together using an electric chain hoist.

[0014] After lifting to the first set height, the second section wall panel is fixedly connected to the first section wall panel. After the fixing is completed, the first section wall panel, the second section wall panel and the warehouse top plate are lifted again to the second set height to install the next section wall panel until all sections of the wall panel are fixed and installed;

[0015] After all the wall panels are fixed and installed, each wall panel and the roof panel are dropped into the warehouse at the same time, and the wedge-shaped pad of the last wall panel is fixedly connected to the triangular steel plate.

[0016] As a further limitation, the width of the limiting ring is determined according to the thickness of the bottommost section of the wall panel.

[0017] As a further limitation, when installing the second section of wall panels, all the wall panels around the circle are welded together. After the vertical seams of the wall panels are welded and tested to be qualified, the roof panel of the warehouse is welded together with the first section of wall panels;

[0018] When welding horizontal seams, level and fix them from the inside, arrange a welding point at a set distance, weld in the same direction, tap the weld lightly at intervals to release the welding stress until one circle of welds is completed.

[0019] As a further limitation, after the roof plate of the silo is welded to the first section of the wall plate, a welded steel railing is installed on the roof plate of the silo.

[0020] As a further limitation, the material used for the warehouse roof railings is the material that has been rust-removed and painted with anti-rust paint. After the anti-rust paint has dried, it is cut and processed according to the design size to make the material used for welded railings, and then the made material is welded to the warehouse roof.

[0021] As a further limitation, after the welding of the first section of the wall panel is completed, the chain electric hoist is used to lift the welded first section of the wall panel and the warehouse roof. The chain electric hoists are controlled uniformly to ensure synchronous lifting. After the first section of the wall panel and the warehouse roof are lifted to the construction height, the electric fall chain is used to lock the warehouse body, and then the installation and fixing of the next section of the wall panel is started.

[0022] As a further limitation, when welding the next section of the wall panel, first weld the inner side of the wall panel in the warehouse, and at the same time perform a self-inspection on the outer side of the wall panel facing the already welded wall panel. After passing the self-inspection, apply a layer of primer and finally apply two coats of topcoat.

[0023] As a further limitation, the lower wall panel is hoisted around the lower side of the upper wall panel. When each wall panel is finally locked, one or two vertical adjustment welds are reserved and not welded temporarily. After the length of the last wall panel is adjusted, the locking is welded;

[0024] Weld the positioning plates on the upper and lower wall panels on both sides of the weld seam. After the lower wall panel is locked, use the chain electric hoist to lower the upper warehouse body and connect it with the lower wall panel, and weld the horizontal weld seam.

[0025] As a further limitation, a holding pole is installed in the warehouse, and two chain electric hoists are symmetrically installed on the top ears of the holding pole. The lifting ears are welded to the inside of the wall panel. The hook of each chain electric hoist is hung on the installed lifting ears. The tightness of each chain electric hoist is adjusted one by one to ensure that each electric hoist is evenly stressed.

[0026] First, lift the warehouse body to the set distance and then stop running to judge the stress condition of each chain electric hoist. If any chain electric hoist does not reach or exceeds uniform stress, make adjustments to ensure that each chain electric hoist is evenly stressed.

[0027] As a further limitation, monitoring points are marked at the set positions of the ring plate before lifting, and intermediate measurements are taken during the lifting process to monitor the lifting height in all directions. When the maximum lifting height difference exceeds the set value, the lifting is suspended;

[0028] As an optional solution, after each wall panel is welded during the lifting process, silo images are acquired from multiple angles. The image capture points are located at the same horizontal height. The silo images from various angles are fused to obtain the overall silo image data.

[0029] The overall image data of the silo is compared with the inner edge of the foundation ring plate to determine whether the wall panels after lifting and welding can fall within the limit ring. If so, construction of the next wall panel is continued. If not, the current welded wall panel is corrected and the fused image is obtained again for judgment until the wall panel can fall within the limit ring.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. The present invention innovatively proposes a method for installing a steel plate silo with an integral electric lifting device. The bottom of the wall panel is connected to the triangular steel plate through a wedge-shaped washer, ensuring the matching of the wall panel and the upper center line of the foundation ring plate, so that the external dimensions of the warehouse body and the allowable deviation are within the set range, ensuring the accuracy of construction.

[0032] 2. The present invention innovatively proposes a method for installing a steel plate silo with an integral electric lifting device. Combined with the image fusion processing method, image fusion comparison and analysis are performed after each section of the wall panel is welded to ensure the matching of the wall panel and the inner edge of the limit ring, thereby improving construction efficiency while ensuring construction progress.

[0033] Advantages of additional aspects of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0035] Figure 1 A schematic flow chart of a method for installing a steel plate silo using an integral electric lifting device according to an embodiment of the present invention;

[0036] Figure 2 A schematic diagram of the pole position provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0037] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0038] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0039] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0040] In the absence of conflict, the embodiments of the present invention and the features thereof may be combined with each other.

[0041] Example 1:

[0042] like Figure 1 As shown, embodiment 1 of the present invention provides a method for installing a steel plate silo with an integral electric lifting device, which is introduced with the following case:

[0043] Two new 60,000 m 3 The vertical cylindrical vaulted steel welded ash storage silo has a 48m diameter steel plate silo and a 37m elevation above the silo's top. The silo's total height is 46m. The bottom of the silo is constructed of 32mm thick Q355C ring plates. Each layer of silo's wall panels ranges in thickness from 8mm to 28mm, made of Q355C. The silo's wall reinforcement ribs are Q355B, and any unspecified steel is 235B. The roof arch is a steel truss structure with a 4mm thick Q335B roof panel. The total weight of the steel silo is approximately 1,300t. The silo's wall panels are installed using an electric hoist and flip-up process.

[0044] This invention uses an inverted installation method for group hoists (low-speed electric chain hoists). 85 symmetrically arranged girders (Ø219*6) are used inside the steel silo as suspension points for the group hoists. A total of 170 10t electric chain hoists are suspended, resulting in a theoretical lifting capacity of 170*10*0.8 = 1360t.

[0045] Specifically, the method for installing a steel plate silo using the integral electric lifting device includes the following steps:

[0046] S1: Welding and installation of the warehouse body.

[0047] S1.1: Construction process flow.

[0048] Shot blasting and rust removal, apply anti-rust primer → Install and weld the first section of wall panel from top to bottom → Install roof truss → Install holding rod and guide chain → Make and install roof reinforcement beam and roof steel plate → Install tank top railing → Install roof equipment → Apply anti-rust primer and assemble the second section of steel plate → Raise the height of this section of steel plate as a whole → Weld the vertical weld of this section of steel plate → Weld the circumferential weld of this section of steel plate → Weld the circumferential reinforcement rib → Weld the vertical reinforcement rib → Inspect welds → Apply anti-rust primer and assemble the next section of wall panel → … → Assemble the lowest section of wall panel → Weld the vertical weld of the last section of steel plate → Weld the circumferential weld of the last section of steel plate → Weld the flange of the last section of wall panel to the bottom plate → Remove guide chain and holding rod.

[0049] S1.2: Warehouse lifting process.

[0050] Preparation for electric hoist entering site → Performance inspection of electric hoist → Arrangement and installation of lifting boom → Positioning of sling → Inspection of lifting sling → Preparation work before lifting → Trial lifting → Inspection of uniform tightness of each fall chain → Lifting and opening of warehouse → Lifting into place → Stop lifting operation → Install warehouse wall panels and weld them firmly → Release sling → Prepare for lifting of next warehouse section → Install N warehouse sections into place → Lower into warehouse and secure → Remove boom → Evacuate equipment from site.

[0051] S1.3: Electric chain hoist operation mode

[0052] (1) For newly installed electric hoists or those installed after disassembly and inspection, the electric hoist should be tested several times with no load. However, it is forbidden to test run the electric hoist before the installation is completed.

[0053] (2) During use, it is absolutely forbidden to use the device in an unauthorized environment or when the rated load and rated closing times per hour (120 times) are exceeded;

[0054] (3) During installation, adjustment and maintenance, the limiting device must be strictly checked for flexibility and reliability. When the hook is raised to the upper limit position, the distance between the hook shell and the drum shell must be greater than 120mm. When the hook is lowered to the lower limit position, the safety circle of the steel wire rope on the drum must be ensured. The effective safety circle must be more than 2 circles;

[0055] (4) It is not allowed to press two hand button to make the electric hoist move in opposite directions at the same time;

[0056] (5) After work, the main switch of the power supply must be pulled off to cut off the power supply;

[0057] (6) The electric hoist should be operated by a dedicated person. The operator should fully master the safety operation procedures and is strictly prohibited to pull obliquely and hoist obliquely;

[0058] (7) During use, the electric hoist must be regularly checked by a dedicated person. If a fault is found, take measures in time and carefully record it;

[0059] (8) When adjusting the brake slip of the electric hoist, it should be ensured that under the rated load, the brake slip S≤V / 100 (V is the distance of stable lifting within one minute under load).

[0060] S2: Weld the first section of wall plate.

[0061] The first section of wall plate is welded by carbon dioxide gas shielded welding. The inner edge line of the wall plate is drawn on the pre-buried foundation ring plate at the bottom of the warehouse. The wall plate is cleaned by shot blasting at the assembly site. After shot blasting, a circle of limiting is welded with triangular steel plate according to the drawn edge line and the bottom ring plate, so that the wall plate is located in the limiting (the limiting width is referenced to the thickness of the last strip plate: t < w ≤ 1.3t). After the wall plate is corrected, all the wall plates in this week are welded together. When welding the vertical seam of the wall plate of 12mm and above, the steel plate must be beveled first. The bevel of the steel plate must meet the design requirements of the drawing;

[0062] After the vertical seam of the wall plate is welded and detected, the top plate of the warehouse is welded with the first section of wall plate. After the wall plate is fixed, the welding is carried out from the inside. There is a welder (or welding robot) every 3 meters, and the welding is carried out in the same direction. Every section is lightly hit by a hammer to release the welding stress until the welding of the whole week is completed.

[0063] The wedge-shaped spacer is used to ensure that the steel plate stands on the center line of the ring-shaped wall plate, so that the outer shape size of the warehouse body and the allowable deviation should meet the requirements of Table 1.

[0064] Table 1: Allowable deviation

[0065]

[0066] It is calculated that the thickness difference of adjacent wall plates of the library body is 2mm or 3mm, and the measures of limiting plate and wedge-shaped shim for welding of the library cylinder can meet the technical requirements of Table 1.

[0067] S3: Install the library top truss.

[0068] S3.1: According to the design drawing, the truss beam is manufactured and welded

[0069] Before the truss is installed, the center is determined on the foundation according to the design drawing, the stand column is made of H-shaped steel 250*125*6*9, the inclined support and horizontal support are made of 16 channel steel, the center platform support is welded and fixed, the width is 3.6m*3.6m and the height is 9m, the elevation is found, the position of 3 / 2 above the stand column is pulled to the position of the low ring plate of the library by using Ф18 steel wire rope and 3T hand-operated hoist, the center platform of the library top is installed and welded, after the installation of the center platform is completed, the first wall plate and the top ring beam of the library wall are welded, the single weight of the truss is 3 tons, the span is 21.5m (the lug is made of 8δ steel plate 100*100 with a center hole of 50*50 welded on both sides), the truss is installed by using 50T automobile crane, the truss is hoisted to the installation position by using the crane, one end of the truss is fixed with the top truss support ring beam of the ash library cylinder and is welded according to the requirements of the drawing, the other end of the truss is fixed with the center platform and is welded according to the design requirements. The truss is installed in sequence, the truss and the reinforced beam are installed symmetrically, after the welding of every two groups of trusses is completed, the ring-shaped tie rod between the trusses is installed, and the whole library top truss is connected as a whole.

[0070] S3.2: Install and weld the library top rail

[0071] After the library top plate and the first section of wall plate are welded, the steel rail on the library top plate is installed and welded, the material for the library top rail is first rusted and painted with anti-rust paint on the ground, after the anti-rust paint is dried, the material is cut according to the size of the design drawing, then the material is welded on the library top plate.

[0072] S4: Library body lifting

[0073] After the first section of wall plate is welded and the quality meets the requirements, the wall plate and the library top plate that have been welded are lifted by using the ring chain electric hoist, the ring chain electric hoist is controlled by using the switch to make it synchronous lifting, so as to avoid the inclination of the library body during lifting, during the lifting process, the construction personnel should check the lifting condition in time, stop lifting in time if problems are found, continue to lift the library wall and the library top after the problems are eliminated, then lock the library body by using the electric hoist, then start to install and fix the next section of wall plate, after the next section of wall plate is clamped by using the steel plate clamp, the steel plate is lifted and hoisted to the installation position by using the crane, and is placed and fixed;

[0074] The vertical seam welding method of the next section of wall panel is the same as that of the previous section. The seam welding is butt welding. The butt joint of steel plates must meet the design requirements of the drawings, and the height of the weld must meet the requirements of the design and specifications. When welding the next section of wall panel, first weld the inner side of the wall panel in the warehouse, and at the same time, conduct a self-inspection on the outer side of the wall panel facing the welded wall panel. After passing the self-inspection, report to the construction unit and the supervision unit for acceptance. After passing the acceptance, apply a layer of primer. The primer must be applied evenly and tightly without any omissions. Finally, apply two coats of topcoat. The welding and installation of each subsequent section of wall panel shall be carried out in sequence according to the above operating methods until the welding and installation of the last section of wall panel is completed.

[0075] More specifically, the following processes are involved:

[0076] Step 1: Hoist the lower section of the warehouse wall panel around the lower side of the upper section, and weld the longitudinal seams according to welding technical requirements. When each strip of panels is finally locked, reserve one or two vertical welds for adjustment based on the actual situation on site and do not weld them temporarily. After the length of the last panel is adjusted, weld the lock seam. Weld the positioning plates on the upper and lower sides of the warehouse wall panels on both sides of the weld seam. After the lower section of the warehouse wall panel is locked, use the chain electric hoist to lower the upper warehouse body and connect it to the lower wall panel, and weld the horizontal welds.

[0077] Step 2: Install the poles inside the warehouse by welding them in place. Install two electric chain hoists symmetrically on the pole lugs. Weld the lifting lugs to the inside of the warehouse wall panels as required. Attach the hooks of each electric chain hoist to the installed lifting lugs on the warehouse wall panels. Adjust the tension of each electric chain hoist individually to ensure even force is applied to each hoist.

[0078] Step 3: Try to lift the warehouse

[0079] During warehouse hoisting, the operator controls the synchronous operation of the chain hoists through the master console. Three to four other personnel oversee the operation of each chain hoist and the stresses applied to each hoist during operation. The warehouse is first hoisted 20-50mm, then stopped. The overseers then check the stresses applied to each chain hoist individually. If any chain hoist is found to be under or over-uniformly stressed, the operator is promptly notified to adjust that chain hoist individually through the master console to ensure its stresses are consistent with those of the other hoists.

[0080] Measures to ensure uniform lifting include:

[0081] (1) This project uses electric hoists of the same brand and model to ensure consistent lifting speed;

[0082] (2) Before lifting, adjust the tightness of each chain electric hoist one by one to ensure that the lifting starting point of each electric hoist is consistent;

[0083] (3) Before lifting, mark monitoring points at appropriate locations on the ring plate, conduct intermediate measurements during the lifting process, and monitor the lifting height in four directions; when the maximum lifting height difference exceeds 2 cm, make adjustments before continuing to lift; (the minimum allowable deformation of the building foundation is 0.001L = 5 cm);

[0084] (4) After the whole is lifted to the construction height, measurements are carried out to ensure that the lifting height is consistent;

[0085] (5) Record and keep the inspection records or stop inspection records during the lifting process.

[0086] Step 4: After unified adjustment and confirmation, the formal lifting of the warehouse will begin. The operator starts the power supply and lifts synchronously, and the caretaker closely observes and inspects the operating status of the electric chain hoist within their respective ranges. The lifting will not stop until it reaches the predetermined height. The lifting height is 2-3cm greater than the plate height. The caretaker measures the lifting height at any time and reminds the operator in time when it is close to the lifting height. At the same time, a limit point is set on the holding rod to prevent it from being lifted too high. A wind speed monitoring point is set on site, and a special person is arranged to monitor with an anemometer before and during the lifting process. When the wind speed reaches level 4, it will be reported to the lifting control personnel. The control personnel will determine whether to lift according to the actual wind speed on site. In addition, pay attention to the weather forecast and the strong wind and thunderstorm weather forecast notifications issued by the owner, supervisor and other management personnel in the group in real time, and adjust the construction procedures in time. When the wind speed exceeds level 5, the lifting operation is stopped.

[0087] Step 5: Use a steel ruler to measure the horizontal, vertical, diameter and other dimensions. After adjusting and checking the dimensions in all directions, weld and fix the fillet welds at the joints between the upper and lower sections of the plate according to the design requirements of the drawing.

[0088] Step 6: After the upper and lower warehouse wall panels are welded and fixed, release the lifting chain electric hoist to complete the warehouse lifting process.

[0089] Step 7: When the warehouse is hoisted to a certain height, wind-resistant columns and vertical ribs are installed from top to bottom on the inside of the warehouse. Specific implementation is in accordance with the design requirements of the drawings.

[0090] Step 8: After the last section of the warehouse wall panel is lifted and hoisted, the root of the entire warehouse cylinder is welded to the pre-set embedded ring flange plate, with full welding inside and outside, and the root reinforcement plates are welded inside and outside according to the design drawings.

[0091] S5: Warehouse lifting and hoisting operations.

[0092] S5.1: A master hoist control power box is installed in the center of the warehouse floor. A mast is erected on one side of the power box. A connecting plate is welded to the top of the mast. Each circumferential holding pole is connected to the connecting plate with steel wire and tightened. The power cables of each chain hoist are laid along the steel wire rope and then connected to the master control box and the corresponding controller.

[0093] S5.2: Selection of lifting lugs for poles and panels: The lifting lugs are fully welded on both sides. Before lifting, inspect each lug weld item by item to ensure that the weld quality meets the lifting requirements. Verification (see the attached table) shows that the lifting lugs fully meet the lifting requirements and can ensure the safety of the lifting operation.

[0094] S5.3: Pole fixing: The pole is fixed by welding and adding steel pipes.

[0095] (1) Use the inner contact surface of the ring flange at the root of the pole for welding to root and fix the pole. When welding, the pole should be leveled and aligned before fixing.

[0096] (2) After the pole welding is completed, in order to ensure the stability of the pole, the tops of adjacent poles are welded together with DN40 welded steel pipes to form a ring-shaped whole, thereby forming a solid and independent lifting system.

[0097] (3) During the hoisting process, one person operates the centralized control console inside the warehouse, and the other three people supervise whether there are any abnormal noises during the hoisting process, so as to detect any faults during the hoisting and stop the operation in time.

[0098] (4) Emergency handling of faults during hoisting and installation of the warehouse:

[0099] If a chain hoist fails during the hoisting operation, the hoisting operation should be stopped immediately. Replace the faulty chain hoist or repair the chain hoist, then recalibrate the hoisting operation and proceed to the next step after checking and confirming the fault.

[0100] S6: Warehouse body production, welding and storage

[0101] The reinforcement of the steel plate silo's inner wall is carried out simultaneously with the silo's lifting. After the welding of the last section of the silo's wall steel plate is completed, the silo is lowered to the inner wall setting-out line reserved for the ring flange.

[0102] The inner and outer walls of the warehouse are cross-welded in sections around the perimeter. After completion, the lifting equipment and facilities are removed. Finally, the inner and outer walls of the warehouse body and flange joints are fully welded, and the steel plate warehouse bottom ribs are welded according to the design requirements.

[0103] S7: Pole and chain selection

[0104] 1) Selection of guide chain

[0105] The theoretical lifting capacity of a single warehouse design of the present invention is about 1218 tons. The warehouse wall and roof are constructed by the inverted installation method. Automobile cranes and self-made sports cars are used to assist the wall panels. 85 lifting arms are symmetrically arranged around the perimeter of the warehouse. The lifting power is 170 10T chain electric hoists. The arms are symmetrically and evenly arranged along the perimeter of the circle. Figure 2 As shown in the figure, each pole bottom ring is welded and fixed to the embedded flange.

[0106] When the 18th wall panel of the steel plate ash silo was installed and lifted to the bottom, the 170 10-ton electric hoists were subjected to the greatest force.

[0107] According to the design and calculation of the construction drawings, the actual maximum lifting weight G real = 1218T;

[0108] Analysis of the effect of wind load on lifting:

[0109] According to the construction plan, it shall not be lifted when the wind speed reaches level 5 or above. The corresponding wind speed is 10m / s and the corresponding wind pressure is q=0.07kN / m 2 .

[0110] Then the additional bending moment caused by the load additional bending moment on the guide chain is:

[0111] Mw = Fw1H / 2 + Fw2h2 = qcs1H / 2 + qcs2 = 0.07x0.5x48x46x46 / 2 + 0.07x216.2x0.5x48.3 = 74.4x24 + 7.57x48.3 = 1786 + 365 = 2151 kN.m (c: shape coefficient, both spherical and cylindrical surfaces are taken as 0.5. S1 is the cylindrical cross-sectional area, S2 is the spherical cross-sectional area = S sector - S triangle = 75° / 360×3.14×39.22 <spherical radius> - 1 / 2×48×31) = 261.2 m 2 ;

[0112] The combined moment of inertia of the 85 poles is I = (s × ∫L² – s is the cross-sectional area of ​​the pole, L is the distance from the pole to the neutral axis) = 2278.74 m². The cross-sectional area of ​​a single pole is s = 0.0412 m². 2 .

[0113] The maximum axial force generated in the guide chain is: G3 = 1 / 2 × Mw / I × D / 2 × s = 0.786 kN = 0.078 tons.

[0114] G average = lifting weight ÷ number of lifting lugs = 1218 ÷ 170 = 7.16T;

[0115] Lifting weight of each electric chain hoist: F=G average

[0116] / COS18+G3=7.162x1.5 / 1.58+0.078=7.61T;

[0117] Safety factor of electric chain hoist: σ = 1.25;

[0118] The maximum lifting weight of each electric chain hoist is: Gmax = σF = 9.5T;

[0119] Rated lifting load of chain electric hoist: G rated = 10T > 9.5T, that is, G rated > G maximum;

[0120] Total lifting weight of electric chain hoist: G max 0.8Tx170 units = 1360T;

[0121] Total lifting weight 1360> Actual maximum lifting weight 1218T;

[0122] Actual safety factor: σ=1.33>Electric hoist lifting safety factor: σ=1.25; so it is safe;

[0123] Therefore, 85 holding poles are set up, each with two electric hoists, that is, 170 electric hoists are used to lift the warehouse body to meet the lifting safety and process requirements.

[0124] The power of the electric chain hoist is 500w×170=85kW;

[0125] If the voltage is 380V, the maximum current is Imax=85000 / 380=223.7A, and the instantaneous maximum current is 230A.

[0126] 2) Calculation of lifting capacity of poles and wall panel lifting lugs

[0127] The dimensions of the lifting lugs for the pole and wall panels are: 18×250×620, the hole size is 60×120, and the material is Q355B. The lifting capacity of the lifting lugs is: Tensile stress calculation: ( Allowable tensile stress of steel, S = h × l - S: effective area of ​​weld, h: effective width of weld, l: length of weld, welding length on both sides of lug 500mm, weld foot 18mm, weld height 18mm, tested with KH45B precision welding inspection ruler) = 240N / mm 2 ×0.7×18mm×2×500mm=302400N, totaling 30857KG, and the actual tensile stress is 7032.9KG;

[0128] Calculation of shear stress: τ = G / S = 7032.9 / 6 × 1.8 = 65.12 MPa < 98 MPa (allowable shear stress of steel).

[0129] Optionally, in some other implementations, after each wall panel is welded during the lifting process, silo images from multiple angles are acquired, with the image capture points located at the same horizontal height. The silo images from various angles are fused to obtain overall silo image data.

[0130] Compare the overall image data of the silo with the inner edge of the foundation ring plate to determine whether the wall panels after lifting and welding can fall within the limit ring. If so, continue to construct the next wall panel. If not, correct the currently welded wall panel and obtain the fused image again for judgment until the wall panel can fall within the limit ring.

[0131] It is understandable that in some other implementations, image acquisition can also be performed in real time. Based on the acquired fusion image, it is determined whether the current deformation of the storage cylinder and arch height, the verticality of the storage cylinder, the cylinder diameter, the local concave-convex deformation of the cylinder wall, and the local concave-convex deformation of the storage top are greater than the set threshold. If so, construction correction is stopped; if not, construction continues.

[0132] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A method for installing a steel plate silo using an integral electric lifting device, characterized in that: At least the following processes are included: Determine the inner edge of the wall panel based on the pre-buried foundation ring plate at the bottom of the reservoir; According to the inner edge of the wall panel, multiple triangular steel plates are fixed around the base ring plate to form a limiting ring, which is used to support the segmented wall panel; wherein, the bottom of the wall panel is in contact with the triangular steel plate through a wedge-shaped washer; Install the roof truss, connect the roof plate to the first section wall plate, and lift the first section wall plate and roof plate fixed together using an electric chain hoist. After lifting to the first set height, the second section wall panel is fixedly connected to the first section wall panel. After the fixing is completed, the first section wall panel, the second section wall panel and the warehouse top plate are lifted again to the second set height to install the next section wall panel, until all the section wall panels are fixed and installed; After all the wall panels are fixed and installed, each wall panel and the roof panel are dropped into the warehouse at the same time, and the wedge-shaped pad of the last wall panel is fixedly connected to the triangular steel plate.

2. The method for installing a steel plate silo using an integral electric lifting device according to claim 1, characterized in that: The width of the limiting ring is determined according to the thickness of the bottom section of the wall panel.

3. The method for installing a steel plate silo using an integral electric lifting device according to claim 1 or 2, characterized in that: When installing the second section of wall panels, weld all the wall panels together. After the vertical seams of the wall panels are welded and tested to be qualified, weld the roof panel to the first section of wall panels. When welding horizontal seams, level and fix them from the inside, arrange a welding point at a set distance, weld in the same direction, tap the weld lightly at intervals to release the welding stress until one circle of welds is completed.

4. The method for installing a steel plate silo using an integral electric lifting device according to claim 1, characterized in that: After the roof plate and the first section of the wall plate are welded, welded steel railings are installed on the roof plate.

5. The method for installing a steel plate silo using an integral electric lifting device according to claim 4, characterized in that: The material used for the warehouse roof railing is rust-removed and painted with anti-rust paint. After the anti-rust paint dries, it is cut and processed according to the design size to make the material used for welded railings, and then the prepared material is welded to the warehouse roof.

6. The method for installing a steel plate silo using an integral electric lifting device according to claim 1, characterized in that: After the welding of the first section of wall panel is completed, the chain electric hoist is used to lift the welded first section of wall panel and the warehouse roof. The chain electric hoists are controlled uniformly to ensure synchronous lifting. After the first section of wall panel and the warehouse roof are lifted to the construction height, the electric fall chain is used to lock the warehouse body, and then the installation and fixing of the next section of wall panel is started.

7. The method for installing a steel plate silo using an integral electric lifting device according to claim 6, characterized in that: When welding the next section of the wall panel, first weld the inner side of the wall panel in the warehouse, and at the same time perform a self-inspection on the outer side of the wall panel facing the already welded wall panel. After passing the self-inspection, apply a layer of primer and finally apply two coats of topcoat.

8. The method for installing a steel plate silo using an integral electric lifting device according to claim 6, wherein: Hoist the lower wall panel around the lower side of the upper wall panel. When locking each wall panel, reserve one or two vertical welds for adjustment and do not weld them temporarily. After the length of the last wall panel is adjusted, weld the locking seams. Weld the positioning plates on the upper and lower wall panels on both sides of the weld seam. After the lower wall panel is locked, use the chain electric hoist to lower the upper warehouse body and connect it with the lower wall panel, and weld the horizontal weld seam.

9. The method for installing a steel plate silo using an integral electric lifting device according to claim 6, wherein: A holding pole is installed in the warehouse. Two chain electric hoists are symmetrically installed on the top ears of the holding pole. The lifting ears are welded to the inside of the wall panel. The hook of each chain electric hoist is hung on the installed lifting ears. The tightness of each chain electric hoist is adjusted one by one to ensure that each electric hoist is evenly stressed. First, lift the warehouse body to the set distance and then stop running to judge the stress condition of each chain electric hoist. If any chain electric hoist does not reach or exceeds uniform stress, make adjustments to ensure that each chain electric hoist is evenly stressed.

10. The method for installing a steel plate silo using an integral electric lifting device according to claim 9, characterized in that: Before lifting, mark the monitoring point at the set position of the ring plate. During the lifting process, take intermediate measurements to monitor the lifting height in all directions. When the maximum lifting height difference exceeds the set value, stop lifting. or, During the lifting process, after welding each wall panel, silo images from multiple angles are acquired. The image shooting points are located at the same horizontal height. After fusing the silo images from different angles, the overall image data of the silo is obtained. The overall image data of the silo is compared with the inner edge of the foundation ring plate to determine whether the wall panels after lifting and welding can fall within the limit ring. If so, construction of the next wall panel is continued. If not, the current welded wall panel is corrected and the fused image is obtained again for judgment until the wall panel can fall within the limit ring.

Images