A horizontal construction device and construction method for rolling groups of stainless steel storage tanks

Abstract

The present invention relates to a horizontal construction device and a construction method for rolling assembly of stainless steel storage tanks. There are two traditional methods for installing storage tanks. One is the upright installation method using an external scaffolding. This method consumes a lot of manpower and has a slow construction progress. The other is the inverted installation method, which has a high machinery cost and poor safety. A horizontal construction device for rolling assembly of stainless steel storage tanks, comprising: a horizontal assembly device structure, a driving device, a stability monitoring device and an anti-carburization structure. The horizontal assembly device comprises a tugboat box base square tube (1), the tugboat box base square tube is welded and fixed to a supporting tugboat box (2), the supporting tugboat box is connected to a supporting tugboat (3) through a rotating shaft, a trustee (4) is supported above the supporting tugboat, rubber or brown rope (5) is vulcanized on the trustee, a steel pipe connecting plate (6) is installed at one end of the trustee, the steel pipe connecting plate is connected to a reducer (7), and the reducer is connected to a motor (8). The present invention is applied to storage tank assembly construction.

Description

Technical Field

[0001] The invention relates to a horizontal construction device and a construction method for a rolling group of stainless steel storage tanks. Background Art

[0002] At present, the country vigorously advocates green construction. Under the premise of ensuring basic requirements such as quality and safety, through scientific management and technological progress, it maximizes resource conservation and reduces the impact of construction activities on the environment, achieving four savings and one environmental protection (energy conservation, land conservation, water conservation, material conservation and environmental protection). Safety and energy conservation are the key control contents of pressure vessel and storage tank production.

[0003] There are two traditional methods for installing storage tanks. One is the upright installation method using external scaffolding, which consumes a lot of manpower and has a slow construction progress; the other is the inverted installation method, which has a high machinery cost and poor safety.

[0004] The construction process of traditional upright storage tanks: laying and welding of tank bottom plates → production and installation of the first circle of tank wall plates → erecting double-row operating scaffolding outside the tank wall and manually welding the outer group of tank walls → hanging a triangular mobile platform inside the tank wall and welding with a welding trolley → welding of the second circle of plates, raising the external scaffolding, and moving the internal triangular movable frame upwards and welding with a mobile trolley → overall prefabrication and hoisting of the roof → overall water pressure test of the tank body.

[0005] Traditional inverted tank construction process:

[0006] Tank bottom plate construction and first circle plate fabrication and installation → Prefabricate tank top just above tank bottom → Add center column, set up four circles of holding rods, and first circle expansion ring of tank body → Lift up first circle plate and tank top components → Install and weld second circle of steel plate → Continue lifting and setting up guy ropes, and monitor stability → Until tank body is installed → Remove the holding rods inside the tank body. Summary of the invention

[0007] The purpose of the present invention is to provide a horizontal construction device and a construction method for a rolling group of stainless steel storage tanks, so as to solve the technical problems of low precision, slow progress and low safety guarantee existing in the prior art.

[0008] The above purpose is achieved through the following technical solutions:

[0009] A horizontal construction device for rolling assembly of stainless steel storage tanks, which comprises: a horizontal assembly device structure, a driving device, a stability monitoring device and an anti-carburization structure. The horizontal assembly device comprises a tugboat box base square tube, the tugboat box base square tube is welded and fixed to a supporting tugboat box, the supporting tugboat box is connected to a supporting tugboat through a rotating shaft, a trustee is supported above the supporting tugboat, rubber or brown rope is vulcanized on the trustee, a steel pipe connecting plate is installed at one end of the trustee, the steel pipe connecting plate is connected to a reducer, the reducer is connected to a motor, the motor is fixed above the base, an electrical control box is installed on one side of the base, the through trustee is driven on one side and driven on the other side, when the motor is powered, the speed is changed through the reducer so that the device runs clockwise, and an infrared generator is installed on the supporting tugboat box.

[0010] The described stainless steel storage tank rolling group is a horizontal construction device. After the tank body is hoisted in sections on the described tube, a fixing block with a threaded hole is welded on the tank wall inside the tank body near the tank mouth, and a tension bolt is screwed into the fixing block. Under the tightening of the tension bolt and the fixing block, the tank body is closed. The staggered mouth of the tank body adopts an inclined fixing block welded on the inside of the tank body near the tank mouth, and a top screw is screwed into the inclined fixing block. The displacement is formed by the tightening and release of the inclined fixing block and the top screw in cooperation with the bolts.

[0011] The stainless steel tank rolling assembly horizontal construction device, the tugboat box base square tube, the supporting tugboat box, the supporting tugboat and the trustee constitute a horizontal assembly device structure, the steel pipe connecting plate, the reducer, the motor and the base constitute a driving device, the infrared generator constitutes a stability monitoring device, and the vulcanized rubber or binding palm rope on the trustee constitutes an anti-carburization structure.

[0012] The stainless steel storage tank rolling group is a horizontal construction device, and the tube support is made of seamless steel pipe.

[0013] The construction method of the stainless steel tank rolling group for the horizontal construction device comprises the following steps:

[0014] After the device is in place, the rolled single-section tank body is hoisted onto the device by the on-site crane, and the second single tank body is placed on the device. While placing, the tank body is initially in place (the distance between the tank bodies is controlled at about 100 mm). The distance between the two tank bodies is 3-4 mm through the tension bolts and fixings of the device's tie parts. A 4 mm steel strip is used to fit tightly into the tank body. After the tank body is spot welded, the steel strip is removed for full welding, and the cylinder's docking device is used to correct the tie and misalignment. The range is based on the orthographic projection. The arc length of the cylinder is 18 degrees. Spot welding is carried out after it is qualified. The welding is 3 cm intervals and 35 cm. After that, the device is powered on to rotate to the next matching range. Fixing and spot welding are carried out in the same way until the tank body is spot welded for one week. After spot welding, automatic submerged arc welding is used in close coordination with the rotation of the tank body to carry out the welding operation of the tank body. The welder outside the tank welds the welds outside the tank until the welding operation of the tank body is completed. The installation of accessories inside the tank is completed by the coordination of installation and tank body rotation. There is no need to set up scaffolding poles throughout the process, and the tank body production work can be completed efficiently and quickly.

[0015] The beneficial effects achieved by the present invention are:

[0016] 1. The device of the present invention can be applied to super-large tanks with stainless steel cylinder diameters of 3500mm-6000mm, cylinder lengths of 1m-15m and a maximum load of 50 tons. The production of storage tanks has become a preparation device in my country's super-large projects.

[0017] 2. The present invention changes the tank assembly from vertical to horizontal. After the assembly device is manufactured, it can be put into construction immediately. Only the hemp rope needs to be replaced according to the usage. The tanks can be assembled on rollers, with less mechanical investment, stable operation without high-altitude operations, and easy maintenance with an infrared monitoring system. The construction speed is saved by 1 / 2 and the cost is reduced by 3 / 4 compared with the past. The previous high-altitude operations are changed to horizontal operations, and the qualified rate of quality inspection points is increased to 93.4%.

[0018] 3. The present invention solves the disadvantages of conventional methods that the labor cost, machinery cost and material cost are high, and the quality assurance of high-altitude construction is difficult. In contrast, the semi-automatic rolling group has a simple construction process for containers, a safe and controllable process, a small construction space, and little impact on the surrounding environment, but the construction cost is reduced by 2 / 3. Compared with the conventional method, the new construction method saves 771900-157704=614196 yuan, with obvious economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0020] Attached Figure 1 It is a schematic diagram of the structure of the present invention;

[0021] Attached Figure 2 Yes Figure 1 AA schematic diagram;

[0022] Attached Figure 3 Yes Figure 1 Schematic diagram of horizontal assembly after the single section of the tank at B is hoisted to the hosting;

[0023] Attached Figure 4 Yes Figure 1 Schematic diagram of vertical assembly after the tank body at B is hoisted to the hosting

[0024] In the figure: 1. Square tube of tugboat box base, 2. Support tugboat box, 3. Support tugboat, 4. Tug tube, 5. Rubber or brown rope for tying, 6. Steel pipe connecting plate, 7. Reducer, 8. Motor, 9. Base, 10. Electrical control box, 11. Infrared generator, 12. Tank body, 13. Fixing block, 14. Tension bolts, 15. Slope fixing block, 16. Top screw. DETAILED DESCRIPTION

[0025] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0026] Embodiment 1:

[0027] A horizontal construction device for rolling assembly of stainless steel storage tanks, which comprises: a horizontal assembly device structure, a driving device, a stability monitoring device and an anti-carburization structure. The horizontal assembly device comprises a tugboat box base square tube 1, the tugboat box base square tube is welded and fixed to a supporting tugboat box 2, the supporting tugboat box is connected to a supporting tugboat 3 through a rotating shaft, a trustee 4 is supported above the supporting tugboat, rubber or brown rope 5 is vulcanized on the trustee, a steel pipe connecting plate 6 is installed at one end of the trustee, the steel pipe connecting plate is connected to a reducer 7, the reducer is connected to a motor 8, the motor is fixed above a base 9, an electrical control box 10 is installed on one side of the base, the electrical control box mainly works to supply power, cut off power to realize starting and stopping, the through trustee is driven on one side and driven on the other side, when the motor is powered, the speed is changed by the reducer to make the device run clockwise, an infrared generator 11 is installed on the supporting tugboat box, when the device is running, an infrared beam is generated, when the operation deviates, an alarm is issued to stop.

[0028] Embodiment 2:

[0029] According to the horizontal construction device for the rolling group of stainless steel storage tanks described in Example 1, after the tank body 12 is hoisted in sections on the tube, a fixing block 13 with threaded holes is welded on the tank wall near the tank mouth inside the tank body, and a tension bolt 14 is screwed into the fixing block. Under the tightening of the tension bolt and the fixing block, the tank mouth is closed. The misalignment of the tank body adopts an inclined fixing block 15 welded inside the tank body near the tank mouth, and a top screw 16 is screwed into the inclined fixing block. The displacement is formed by tightening and releasing the inclined fixing block and the top screw. The tension bolts and the fixing block are a group, and the inclined fixing block and the top screw are a group. The spacing is 250㎜-300㎜, mainly depending on the size of the misalignment. The larger the misalignment, the closer it is, and the larger the spacing is. The circumference of the tank body is evenly distributed, and the tank body is dismantled after welding. After the misalignment is corrected and the joints are qualified, spot welding is performed to fix them. The tank body is rotated under the drive of the drive motor to complete the next tank body assembly and spot welding work until a circle of plate spot welding is completed, and then the welding operation is completed on the device.

[0030] Embodiment 3:

[0031] According to the horizontal construction device for rolling assembly of stainless steel storage tanks described in Example 1 or 2, the square tube of the tugboat box base, the supporting tugboat box, the supporting tugboat and the trustee constitute the structure of the horizontal assembly device, the steel pipe connecting plate, the reducer, the motor and the base constitute the driving device, the infrared generator constitutes the stability monitoring device, and the vulcanized rubber or the binding palm rope on the trustee constitutes the anti-carburization structure. The rubber is vulcanized on the trustee on site, and when the stainless steel tank body is placed on the device, the carbon steel device and the stainless steel do not have a carburization reaction due to the isolation of the rubber.

[0032] Embodiment 4:

[0033] Through the comparison of the performance of the base material, the model comparison of BIM technology (base structure form, size calibration between structural parts), application (drawing of production drawings); the use of infrared beams to monitor the rotation stability of the tank body. The use of isolation materials to separate the hosting and the stainless steel tank body.

[0034] The spacing between the tubes can be adjusted according to the diameter of the cylinder. The rolling frame adopts a steel plate structural support. The main parts such as the load-bearing shaft are made of high-quality steel. They are tempered before processing and have strong rigidity, good comprehensive ability, and large load-bearing capacity. Before installing the roller, the hemp rope is wrapped around the roller bar to prevent direct contact between stainless steel and carbon steel and carbonization. The rolling wheel is installed in the side panel assembly. The roller adopts an integral roller structure and is driven by a motor during assembly, which greatly saves machinery costs, has a long service life, and is convenient for maintenance.

[0035] After the base is made, the rolled single circle of the tank body is assembled on the assembly device (2 to 1). After forming, the internal accessories of the tank body can be installed according to the weight of the overall component, and then the whole body is lifted away to proceed to the production of the next storage tank.

[0036] Embodiment 5:

[0037] Construction process and operation points:

[0038] Production of single-circle steel plate lofting coil → Horizontal device layout → Tank body assembly → Tank body welding → Installation of accessories inside the pipe → Skirt installation → Overall pickling → Joint acceptance.

[0039] (1) Measure and lay out before rolling;

[0040] (2) Steel plate rolling;

[0041] (3) Head measurement;

[0042] (4) After rolling, the longitudinal seam joint seam is welded by submerged arc welding and rounded after rolling;

[0043] The specific construction process of the lower head and cylinder assembly is as follows: first, measure the outer circumference of the head uniformly, and then match the outer circumference of the cylinder after rolling and rounding with the size of the upper head to ensure that the outer circumference deviation is within 3mm before assembly. When assembling, first align the head and the cylinder with a ruler, and then the welder fixes them with manual arc welding; align the aligned parts to one side, and use triangular stainless steel wedges and stainless steel door-shaped ribs to align the uneven parts 10-20cm outside the alignment point. First, weld the door-shaped ribs to the edge of the cylinder steel plate where the annular seam is recessed inward, and knock the wedges into the door-shaped ribs to align the head and the cylinder steel plate under the action of the door-shaped ribs and wedges. Then use a ruler to check. The maximum misalignment is ≤1 / 4δ (plate thickness) to be qualified (generally, 12mm steel plates are basically guaranteed to be within 0.5mm, which is much smaller than the required standard error value). After the inspection is qualified, the welder fixes it with spot welding, and then proceeds to the next section of the cylinder. Repeat this cycle until it is completely closed and the assembly is completed;

[0044] (5) Roller tire arrangement

[0045] When arranging and debugging the rollers and putting them on the cylinder, it is necessary to use a ruler to measure the roller spacing and diagonal size. If the size is not appropriate, adjust the size in time to ensure that the two rollers are arranged in parallel. The four corners are connected to form a rectangle as the standard, and then adjust the elevation to ensure that the rollers and the cylinder's various points of force are on the same elevation line; after the rollers are arranged, open the roller control box to dynamically adjust the cylinder's orientation deviation during operation. The operation method is as follows: open the control box to make the rollers rotate, use a stone pencil to draw a straight line at a fixed position on the edge of the roller to leave a mark on the cylinder, and draw a 1-2m mark line every 2-4m. When the cylinder rotates one circle on the roller and closes, draw a mark line to compare with the initial mark to see the direction and size of the error; continuously fine-tune the roller position, and finally make the marks close to overlap to complete the debugging;

[0046] (6) For submerged arc welding of the internal annular seam of the tank, before welding, it is necessary to check whether there is a phenomenon of excessive gap between the groups. If the gap between the groups exceeds the requirements of the drawing, manual arc welding is used to prime the outer annular seam. The residual flux in the tank during the welding primer, the weld points left during the grouping, rust pollution and other problems are then treated and qualified before welding. During submerged arc welding, the welding current, voltage, automatic welding machine speed and other parameters are set on the submerged arc welding machine trolley data control box according to the welding process regulations and assessments. Experienced submerged arc welders make minor adjustments based on the actual on-site conditions such as welding material specifications, groove size, and gap between the groups. The roller tire is adjusted according to the actual speed required by the submerged arc trolley. Welding is carried out when the roller tire is consistent with the speed of the submerged arc welding machine trolley. If the trolley deviates from the weld when driving, the submerged arc welder will make timely adjustments. Generally, the number of welding passes is determined based on the plate thickness, groove form, group gap, etc., until the weld residual height is in the range of 0~0.15δ.

[0047] (7) Air planing and grinding of the outer ring seam of the tank;

[0048] (8) Submerged arc welding of outer ring seam;

[0049] (9) Pickling of annular seams and laying out, acceptance and opening of tank bodies;

[0050] (10) Installation, welding, processing and acceptance of coils and accessories;

[0051] (11) Upper head assembly and circumferential seam welding

[0052] (12) Skirt assembly and welding;

[0053] (13) The tank body is polished, pickled, rust-removed, painted, and inspected before delivery.

Claims

1. A horizontal construction device for rolling groups of stainless steel storage tanks, comprising: The structure, driving device, stability monitoring device and anti-carburization structure of the horizontal pairing device are characterized in that: the horizontal pairing device comprises a square tube of a tugboat box base, the square tube of the tugboat box base is welded and fixed to the supporting tugboat box, the supporting tugboat box is connected to the supporting tugboat through a rotating shaft, a trustee is supported on the supporting tugboat, rubber or brown rope is vulcanized on the trustee, a steel pipe connecting plate is installed at one end of the trustee, the steel pipe connecting plate is connected to a reducer, the reducer is connected to a motor, the motor is fixed above the base, an electrical control box is installed on one side of the base, the through trustee is driven on one side and driven on the other side, when the motor is powered, the speed is changed by the reducer so that the device runs clockwise, and an infrared generator is installed on the supporting tugboat box; After the tank body is hoisted on the said tube section, a fixing block with a threaded hole is welded on the tank wall near the tank mouth inside the tank body, and a tension bolt is screwed into the fixing block. Under the tightening of the tension bolt and the fixing block, the tank mouth is closed. The staggered mouth of the tank body adopts an inclined fixing block welded inside the tank body near the tank mouth, and a top screw is screwed into the said inclined fixing block. The displacement is formed by the tightening and releasing of the said inclined fixing block and the top screw in cooperation with the bolt; The square tube of the tugboat box base, the supporting tugboat box, the supporting tugboat and the trustee constitute a horizontal assembly device structure, the steel pipe connecting plate, the reducer, the motor and the base constitute a driving device, the infrared generator constitutes a stability monitoring device, and the vulcanized rubber or the binding palm rope on the trustee constitutes an anti-carburization structure; The custody system is made of seamless steel pipe; The tension bolts and fixing blocks are a group, and the slope fixing blocks and top screws are a group, with a spacing of 250㎜-300㎜.

2. A construction method for the horizontal construction device of the stainless steel tank rolling group according to claim 1, characterized in that: The method comprises the following steps: After the device is in place, the rolled single-section tank body is hoisted onto the device by the on-site crane, and the second single tank body is placed on the device. The tank body is initially placed in place at the same time. The spacing between the two tank bodies is 3-4 mm through the device's tie bolts and fixings. A 4 mm steel plate is used to fit tightly into the tank body. After the tank body is spot welded, the steel plate is removed for full welding, and the cylinder's docking device is used for tie-in and misalignment correction. The range is based on the 18-degree cylinder arc length of the orthographic projection. Spot welding is performed after passing the test. The welding interval is 35 cm. Centimeters, then the device is powered on to rotate to the next matching range, and fixed and spot welded in the same way until the tank body is spot welded around the circle. After spot welding, automatic submerged arc welding is used in close coordination with the rotation of the tank body to carry out the welding operation of the tank body. The welder outside the tank welds the weld bead outside the tank until the tank body welding operation is completed, and the accessories inside the tank are installed, which is completed by the coordination of installation and tank body rotation. There is no need to set up scaffolding poles throughout the process, and the tank body production work can be completed efficiently and quickly.

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