CN111774745A - Internal and external combined lifting method for low-pressure storage tank body - Google Patents
Internal and external combined lifting method for low-pressure storage tank body Download PDFInfo
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- CN111774745A CN111774745A CN202010511962.9A CN202010511962A CN111774745A CN 111774745 A CN111774745 A CN 111774745A CN 202010511962 A CN202010511962 A CN 202010511962A CN 111774745 A CN111774745 A CN 111774745A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/12—Vessels
- B23K2101/125—Cans
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Abstract
The invention discloses a method for lifting the inner part and the outer part of a low-pressure storage tank body, which comprises the steps of welding a tank top to obtain a tank top, welding an external lifting lug on the outer wall of a pressure-bearing transition section, installing a plurality of groups of external electric chain block lifting mechanisms, lifting the tank top through the plurality of groups of external electric chain block lifting mechanisms to complete the assembly and welding of the tank top and an eighth circle of wall plates, lifting the tank top and the eighth circle of wall plates to a certain height position after the assembly and welding are completed, installing a plurality of groups of internal electric chain block lifting mechanisms, and continuously completing the lifting, assembly and welding operations of other subsequent circle of wall plates. The whole lifting operation process is continuous, convenient, safe and efficient, the external electric chain block lifting mechanism and the internal electric chain block lifting mechanism are combined for use, the position of the upright post of the lifting mechanism is not required to be reserved on the tank top in a skylight opening mode, the workload can be effectively reduced, the installation quality of the tank body is improved, the use amount of scaffold and the construction engineering amount of the scaffold are greatly reduced, and the high-altitude operation is less, the lifting height is low, and the safety risk is smaller.
Description
Technical Field
The invention relates to a method for lifting a low-pressure storage tank body, in particular to a method for lifting the internal and external parts of the low-pressure storage tank body in a combined manner.
Background
In the petrochemical industry and other industries, storage tanks are used for storing chemicals such as petroleum, acid, alkali and the like. Storage tanks are generally classified into atmospheric storage tanks and low-pressure storage tanks according to the magnitude of the saturated vapor pressure of the stored chemical substance.
In recent years, the demand of low-pressure storage tanks or spherical tanks in the industry is greatly increased, and compared with the characteristics of high cost, high construction difficulty and long period of the spherical tanks, the low-pressure storage tanks belong to relatively economic storage containers. FIG. 1 shows a conventional 10000m3The appearance schematic diagram of the low-pressure storage tank comprises a tank top plate, a pressure-bearing transition section, a tank body and a tank top plate, wherein the tank top plate and the pressure-bearing transition section form the tank top, the eighth circle to the first circle of the wall plates form the 8 circles of the wall plates, the tank body is fixed on a tank bottom platform, the tank top plate, the pressure-bearing transition section and the 8 circles of the wall plates are welded into a whole from top to bottom, and the tank top plate, the pressure-bearing transition section and the 8 circles of. 10000m3The low pressure storage tank has taken the pressure-bearing changeover portion structure when designing, and pressure-bearing changeover portion thickness is big (have more than 40 millimeters thick), the slope is steep, need thermal treatment and 100% ray detection after the welding, at the inconvenient trompil of pressure-bearing changeover portion to lead to can't promote the installation construction of two rings of wallboards of top of jar roof at jar internally mounted electronic chain block mechanism. Currently 10000m3The top-filling lifting technical scheme of the uppermost two circles of wallboards of the low-pressure storage tank in the installation construction mainly comprises two types: firstly, an inverted mode (namely an inverted process) of an internal chain-falling lifting mechanism is utilized, and secondly, a mode (namely a forward process) of firstly installing a tank body by a forward installation method and then installing a tank top plate is adopted. Adopt inside chain block flip-chip mode, the tank deck needs the trompil to be for promoting stand headspace, this flip-chip mode utilizes the equipartition to promote the expansion ring of wallboard lower part temporary fixation at the inboard stand that has the jack-up chain block of storage tank, make prefabricated tank deck and first round wallboard rise to predetermined height together, assembly welding second circle wallboard again, loosen the expansion ring afterwards and fall to the expansion of second circle wallboard lower part tightly, promote after fixing, so reciprocal to the completion of welding of last round wallboard assembly, but this mode is more applicable to the installation of ordinary pressure storage tank. For a low-pressure storage tank, a pressure-bearing transition section is arranged on the tank top of the storage tank, and the pressure-bearing transition section is thickThe degree is big, needs heat treatment and 100% ray detection after the welding is accomplished, therefore the pressure-bearing transition section is difficult to the trompil to because the stand of built-in chain block is higher than the pressure-bearing transition section, so can't accomplish the lift task of two rings of wallboards of top only through using built-in chain block hoist mechanism. The method comprises the steps of installing a tank body by adopting a forward installation method and then installing a tank top, erecting an external scaffold according to the forward installation method, installing tank wall plates from bottom to top by utilizing the scaffold and a crane, assembling and welding the central part of the tank top inside a tank, lifting the tank top to the top by using a chain block after the tank wall is installed, and finally assembling and welding the tank wall and the central part of the tank top by hoisting a pressure-bearing transition section. The scaffold adopting the normal assembling process has the advantages of large construction quantity, more high-altitude operation, high safety risk and large welding difficulty inside the pressure-bearing transition section.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the defects of the prior art, the method for lifting the inner part and the outer part of the low-pressure storage tank body continuously, conveniently, safely and efficiently in a combined mode is provided.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for lifting the inside and outside of a low-pressure storage tank body in a combined mode comprises the following steps:
(1) constructing a tank bottom platform, performing welding operation on the tank bottom platform, welding a plurality of tank bottom steel plates into a whole tank bottom plate, and placing the whole tank bottom plate on the tank bottom platform;
(2) a plurality of temporary supports are welded along the circumferential direction of the tank bottom plate in a spot welding mode, the temporary supports are arranged at equal intervals and enclose a circle of support ring, the ring diameter of the support ring is matched with the outer diameter of the tank body, and a gap between every two adjacent temporary supports is used for allowing personnel and materials to enter and exit;
(3) an umbrella stand is fixed on the bottom plate of the tank and is positioned at the inner side of the support ring;
(4) taking the umbrella stand and the support ring as supports, performing welding operation on the upper sides of the umbrella stand and the support ring, welding a plurality of tank top steel plates and a plurality of pressure-bearing transition section steel plates to obtain a tank top plate and a pressure-bearing transition section, welding the tank top plate and the pressure-bearing transition section to obtain a tank top, and placing the tank top on the support ring;
(5) welding a plurality of external lifting lugs along the outer wall of the pressure-bearing transition section, mounting a plurality of groups of external electric chain block lifting mechanisms on the tank bottom plate at intervals along the outer side of the support ring, hooking a hook of each group of external electric chain block lifting mechanisms on one external lifting lug, lifting the whole tank top to the circumferential weld position of an eighth circle of wall plates to be welded through the plurality of groups of external electric chain block lifting mechanisms, keeping the whole tank top in a lifting state, and removing the umbrella stand;
(6) keeping the whole tank top in a hoisting state, assembling and welding the steel plates of the eighth circle of wall plates with the bottom wall of the tank top one by one, wherein in the welding process, the steel plates of each eighth circle of wall plate are respectively supported by a support ring to complete the operation of surrounding the eighth circle of wall plates and assembling longitudinal seams of the wall plates, and installing expansion rings on the inner walls of the eighth circle of wall plates and welding a plurality of built-in lifting lugs;
(7) after the tank top is lifted to a certain height position through a plurality of groups of external electric chain hoist mechanisms, a plurality of groups of internal electric chain hoist mechanisms are arranged on the tank bottom plate along the inner side of the support ring, and each group of internal electric chain hoist mechanisms are respectively fixed by pulling a rod, so that after the plurality of groups of internal electric chain hoist mechanisms are stressed stably, the hook of each group of internal electric chain hoist mechanisms is hooked on one internal lifting lug, the tank top is lowered through the plurality of groups of external electric chain hoist mechanisms, the bottom surface of the eighth ring of wall plates is placed on the support ring, and the plurality of groups of external electric chain hoist mechanisms and the plurality of external lifting lugs are removed;
(8) hoisting the tank top to the circumferential weld position of a seventh circle of wall plates to be welded through a plurality of groups of built-in electric chain block hoisting mechanisms, keeping the whole tank top in a hoisting state, assembling and welding steel plates of the seventh circle of wall plates with the bottom wall of an eighth circle of wall plates one by one, lowering the tank top through the plurality of groups of built-in electric chain block hoisting mechanisms after the seventh circle of wall plates are assembled and welded, pre-supporting the assembly to the circumferential weld, and in the welding process, supporting the steel plates of each seventh circle of wall plates by support rings respectively to finish the operation of surrounding the seventh circle of wall plates and assembling the longitudinal joints of the wall plates, and then installing expansion rings on the inner walls of the seventh circle of wall plates;
(9) hoisting the tank top to the circumferential weld position of a sixth circle of wall plates to be welded through a plurality of groups of built-in electric chain block hoisting mechanisms, keeping the whole tank top in a hoisting state, assembling and welding steel plates of the sixth circle of wall plates with the bottom wall of a seventh circle of wall plates one by one, lowering the tank top through the plurality of groups of built-in electric chain block hoisting mechanisms after the group butt welding of the sixth circle of wall plates is completed, pre-supporting and assembling the circumferential weld, and performing the operation of surrounding the sixth circle of wall plates and assembling the longitudinal weld of the wall plates, wherein in the welding process, the steel plates of each sixth circle of wall plates are respectively supported by a support ring, and after the tank top is hoisted to a certain height position through the plurality of groups of built-in electric chain block hoisting mechanisms, an expansion ring is installed on;
(10) hoisting the tank top to the circumferential weld position of a fifth circle of wall plates to be welded through a plurality of groups of built-in electric chain block hoisting mechanisms, keeping the whole tank top in a hoisting state, assembling and welding steel plates of the fifth circle of wall plates with the bottom wall of a sixth circle of wall plates one by one, lowering the tank top through the plurality of groups of built-in electric chain block hoisting mechanisms after the fifth circle of wall plates are assembled and welded, pre-supporting and assembling the circumferential weld, in the welding process, the steel plates of each fifth circle of wall plates are respectively supported by a support ring, completing the operation of surrounding the fifth circle of wall plates and assembling the longitudinal joints of the wall plates, hoisting the tank top to a certain height position through the plurality of groups of built-in electric chain block hoisting mechanisms, and then installing expansion rings on the inner wall of the fifth circle of wall;
(11) hoisting the tank top to the circumferential weld position of a fourth circle of wall plates to be welded through a plurality of groups of built-in electric chain block hoisting mechanisms, keeping the whole tank top in a hoisting state, assembling and welding steel plates of the fourth circle of wall plates with the bottom wall of a fifth circle of wall plates one by one, lowering the tank top through the plurality of groups of built-in electric chain block hoisting mechanisms after the fourth circle of wall plates are assembled and welded, pre-supporting and assembling the circumferential weld, in the welding process, the steel plates of each fourth circle of wall plates are respectively supported by a support ring, completing the operation of surrounding the fourth circle of wall plates and assembling the longitudinal joints of the wall plates, hoisting the tank top to a certain height position through the plurality of groups of built-in electric chain block hoisting mechanisms, and then installing expansion rings on the inner wall of the fourth circle of wall;
(12) hoisting the tank top to the circumferential weld position of a third circle of wall plates to be welded through a plurality of groups of built-in electric chain block hoisting mechanisms, keeping the whole tank top in a hoisting state, assembling and welding steel plates of the third circle of wall plates with the bottom wall of a fourth circle of wall plates one by one, lowering the tank top through the plurality of groups of built-in electric chain block hoisting mechanisms after the third circle of wall plates are assembled and welded, pre-supporting and assembling the circumferential weld, in the welding process, the steel plates of each third circle of wall plates are respectively supported by a support ring, completing the operation of surrounding the third circle of wall plates and assembling the longitudinal joints of the wall plates, hoisting the tank top to a certain height position through the plurality of groups of built-in electric chain block hoisting mechanisms, and then installing expansion rings on the inner wall of the third circle of wall;
(13) hoisting the tank top to the circumferential weld position of a second circle of wall plates to be welded through a plurality of groups of built-in electric chain block hoisting mechanisms, keeping the whole tank top in a hoisting state, assembling and welding steel plates of the second circle of wall plates with the bottom wall of a third circle of wall plates one by one, lowering the tank top through the plurality of groups of built-in electric chain block hoisting mechanisms after the assembly and the welding of the second circle of wall plates are completed, pre-supporting and assembling the circumferential weld, supporting the steel plates of each second circle of wall plates by support rings in the welding process, completing the operation of surrounding the second circle of wall plates and assembling the longitudinal joints of the wall plates, hoisting the tank top to a certain height position through the plurality of groups of built-in electric chain block hoisting mechanisms, and installing expansion rings on the inner wall of the second circle of wall plates;
(14) hoisting the tank top to the circumferential weld position of a first circle of wall plates to be welded through a plurality of groups of built-in electric chain block hoisting mechanisms, keeping the whole tank top in a hoisting state, assembling and welding steel plates of the first circle of wall plates with the bottom wall of a second circle of wall plates piece by piece, lowering the tank top through the plurality of groups of built-in electric chain block hoisting mechanisms after the first circle of wall plates are assembled and welded, pre-supporting and assembling the circumferential weld, in the welding process, the steel plates of each first circle of wall plates are respectively supported by a support ring, leaving the steel plates of the last first circle of wall plates not to be installed, integrally hoisting the tank body to a certain height through the plurality of groups of built-in electric chain block hoisting mechanisms, then dismantling a plurality of temporary supports, lowering the tank body through the plurality of groups of built-in electric chain block hoisting mechanisms, enabling the tank body to directly fall on the tank bottom plate, then dismantling the plurality of groups of built-in electric chain block hoisting mechanisms and the, and then installing the last steel plate which is not installed, welding a longitudinal welding line, and then welding a circumferential welding line and a large-angle welding line, namely completing the combined lifting construction operation of the whole low-pressure storage tank body.
The lifting process of the low-pressure storage tank body is improved, the tank top is obtained by welding, the external lifting lugs are welded on the outer wall of the pressure-bearing transition section, the plurality of groups of external electric chain hoist mechanisms are installed, the tank top is lifted by the plurality of groups of external electric chain hoist mechanisms, the assembly and welding of the tank top and the eighth circle of wall plates are completed, after the assembly and welding are completed, the expansion ring is installed on the inner wall of the eighth circle of wall plate, the plurality of internal lifting lugs are welded, the tank top and the eighth circle of wall plate are lifted to a certain height position, the plurality of groups of internal electric chain hoist mechanisms are installed, the lifting, the assembly and the welding of other follow-up circle of wall plates are continuously completed, and finally the combined lifting construction operation of the whole low-pressure.
The whole lifting operation process is continuous, convenient, safe and efficient, the external electric chain block lifting mechanism and the internal electric chain block lifting mechanism are used in a combined mode, the position of the upright post of the lifting mechanism is not required to be reserved on the tank top in a skylight opening mode, the workload in the low-pressure storage tank body construction process can be effectively reduced, the installation quality of the low-pressure storage tank body is improved, the usage amount of scaffold and the construction engineering amount of the scaffold are greatly reduced, and the low-pressure storage tank body lifting operation process is less in high-altitude operation, low in lifting height and low in safety risk.
Specifically, the low-pressure storage tank is 10000m3The low-pressure storage tank, the external electronic chain block hoist mechanism of multiunit be 28 external electronic chain block hoist mechanism of group 10T, the built-in electronic chain block hoist mechanism of multiunit be 30 internal electronic chain block hoist mechanism of group 20T.
Compared with the prior art, the invention has the advantages that: the invention provides a method for lifting the inner part and the outer part of a low-pressure storage tank body, which improves the lifting process of the low-pressure storage tank body, firstly welding to obtain a tank top, then welding external lifting lugs on the outer wall of a pressure-bearing transition section and installing a plurality of groups of external electric chain hoist mechanisms, lifting the tank top through the plurality of groups of external electric chain hoist mechanisms to finish the assembly and welding of the tank top and an eighth circle of wall plates, after the assembly and welding are finished, installing expansion rings on the inner wall of the eighth circle of wall plates and welding a plurality of internal lifting lugs, then lifting the tank top and the eighth circle of wall plates together to a certain height position, then installing a plurality of groups of internal electric chain hoist mechanisms, continuing to finish the lifting, assembly and welding operations of other follow-up circle of wall plates, and finally finishing the construction operation of the combined. The whole lifting operation process is continuous, convenient, safe and efficient, the external electric chain block lifting mechanism and the internal electric chain block lifting mechanism are used in a combined mode, the position of the upright post of the lifting mechanism is not required to be reserved on the tank top in a skylight opening mode, the workload in the low-pressure storage tank body construction process can be effectively reduced, the installation quality of the low-pressure storage tank body is improved, the usage amount of scaffold and the construction engineering amount of the scaffold are greatly reduced, and the low-pressure storage tank body lifting operation process is less in high-altitude operation, low in lifting height and low in safety risk.
Drawings
FIG. 1 shows a conventional 10000m3An appearance schematic diagram of the low-pressure storage tank;
FIG. 2 is a schematic view showing a state in which the top of the tank is lifted outside the tank before the eighth ring of the wall plate welding operation is performed;
fig. 3 is a schematic view showing a state in which the top of the can is lifted in the can before the welding operation of the seventh ring of the wall plate is performed.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
With 10000m shown in figure 13For example, the low-pressure storage tank is adopted, and the internal and external combined lifting method for the low-pressure storage tank body is adopted to carry out combined lifting construction operation, and specifically comprises the following steps:
(1) a tank bottom platform 1 is built, welding operation is carried out on the tank bottom platform 1, a plurality of tank bottom steel plates are welded into a whole tank bottom plate 11 and placed on the tank bottom platform 1;
(2) a plurality of temporary supports 21 are welded along the circumferential direction of the tank bottom plate 11 in a spot welding mode, the temporary supports 21 are distributed at equal intervals and enclose a circle of support ring 2, the circle diameter of the support ring 2 is matched with the outer diameter of the tank body, and a gap between every two adjacent temporary supports 21 is used for allowing people and materials to enter and exit;
(3) an umbrella stand (not shown in the figure) is fixed on the tank bottom plate 11 and is positioned at the inner side of the support ring 2;
(4) taking the umbrella stand and the support ring 2 as supports, performing welding operation on the upper sides of the umbrella stand and the support ring 2, welding a plurality of tank deck steel plates and a plurality of pressure-bearing transition section steel plates to obtain a tank deck plate 31 and a pressure-bearing transition section 32, welding the tank deck plate 31 and the pressure-bearing transition section 32 to obtain a tank deck 3, and placing the tank deck 3 on the support ring 2;
(5) welding 28 external lifting lugs 4 along the outer wall of the pressure-bearing transition section, installing 28 groups of 10T external electric chain hoist mechanisms 5 on the tank bottom plate 11 at intervals along the outer side of the support ring 2, hooking a hook of each group of external electric chain hoist mechanisms 5 on one external lifting lug 4, wherein the state schematic diagram is shown in figure 2, hoisting the whole tank top 3 to the circumferential weld position of an eighth ring of wall plates 9 to be welded through the 28 groups of 10T external electric chain hoist mechanisms 5, keeping the whole tank top 3 in a hoisting state, and removing the umbrella stand;
(6) keeping the whole tank top 3 in a hoisting state, assembling and welding the steel plates of the eighth circle of wall plates 9 with the bottom wall of the tank top 3 one by one, wherein in the welding process, the steel plates of each eighth circle of wall plate 9 are respectively supported by a support ring 2, so as to finish the operation of surrounding the eighth circle of wall plates 9 and assembling longitudinal seams of the wall plates, and installing expansion rings 6 on the inner walls of the eighth circle of wall plates 9 and welding 30 built-in lifting lugs 7;
(7) after the height position of the tank top is lifted by 28 groups of 10T external electric chain hoist mechanisms 5 to reach 1m, 30 groups of 20T internal electric chain hoist mechanisms 10 are arranged on the tank bottom plate 11 along the inner side of the support ring 2, each group of internal electric chain hoist mechanisms 10 is respectively fixed by pulling a pull rod 8, so that the 30 groups of 20T internal electric chain hoist mechanisms 10 are stressed stably, the hook of each group of internal electric chain hoist mechanisms 10 is hooked on one internal lifting lug 7, the tank top 3 is lowered by the 28 groups of 10T external electric chain hoist mechanisms 5, the bottom surface of the eighth ring wall plate 9 is placed on the support ring 2, the 28 groups of 10T external electric chain hoist mechanisms 5 and the 28 external lifting lugs 4 are removed, and the state diagram at the moment is shown in FIG. 3;
(8) hoisting the tank deck 3 to the circumferential weld position of a seventh circle of wall plates to be welded through 30 groups of 20T built-in electric chain block hoisting mechanisms 10, keeping the whole tank deck 3 in a hoisting state, assembling and welding the steel plates of the seventh circle of wall plates with the bottom wall of an eighth circle of wall plates 9 piece by piece, after the seventh circle of wall plate assembly is welded, lowering the tank deck 3 through 30 groups of 20T built-in electric chain block hoisting mechanisms 10, pre-supporting the assembly to the circumferential weld and welding, in the welding process, the steel plates of each seventh circle of wall plates are respectively supported by supporting rings 2, completing the operation of surrounding the seventh circle of wall plates and assembling the longitudinal joints of the wall plates, and then installing expansion rings on the inner walls of the seventh circle of wall plates;
(9) hoisting the tank deck 3 to the circumferential weld position of a sixth circle of wall plates to be welded through 30 groups of 20T built-in electric chain block hoisting mechanisms 10, keeping the whole tank deck 3 in a hoisting state, assembling and welding steel plates of the sixth circle of wall plates with the bottom wall of a seventh circle of wall plates one by one, after the assembly and welding of the sixth circle of wall plates are completed, lowering the tank deck 3 through 30 groups of 20T built-in electric chain block hoisting mechanisms 10, pre-supporting assembly and welding the circumferential weld, in the welding process, the steel plates of each sixth circle of wall plate are respectively supported by support rings 2, completing the operation of surrounding the sixth circle of wall plates and assembling the longitudinal weld of the wall plates, after hoisting the tank deck 3 to a certain height position through 30 groups of 20T built-in electric chain block hoisting mechanisms 10, and installing expansion rings on the inner walls of the sixth circle of wall plates;
(10) hoisting the tank deck 3 to the circumferential weld position of a fifth circle of wall plates to be welded through 30 groups of 20T built-in electric chain block hoisting mechanisms 10, keeping the whole tank deck 3 in a hoisting state, assembling and welding steel plates of the fifth circle of wall plates with the bottom wall of a sixth circle of wall plates one by one, after the fifth circle of wall plate assembly is welded, lowering the tank deck 3 through 30 groups of 20T built-in electric chain block hoisting mechanisms 10, pre-supporting and assembling the circumferential weld, in the welding process, the steel plates of each fifth circle of wall plate are respectively supported by support rings 2, completing the operation of surrounding the fifth circle of wall plates and assembling the longitudinal weld of the wall plates, after hoisting the tank deck 3 to a certain height position through 30 groups of 20T built-in electric chain block hoisting mechanisms 10, installing expansion rings on the inner walls of the fifth circle of wall plates;
(11) hoisting the tank deck 3 to the circumferential weld position of a fourth circle of wall plates to be welded through 30 groups of 20T built-in electric chain block hoisting mechanisms 10, keeping the whole tank deck 3 in a hoisting state, assembling and welding steel plates of the fourth circle of wall plates with the bottom wall of a fifth circle of wall plates one by one, after the fourth circle of wall plate group is welded, lowering the tank deck 3 through 30 groups of 20T built-in electric chain block hoisting mechanisms 10, pre-supporting and assembling the circumferential weld, in the welding process, the steel plates of each fourth circle of wall plate are respectively supported by support rings 2, completing the operation of surrounding the fourth circle of wall plates and assembling the longitudinal weld of the wall plates, after hoisting the tank deck 3 to a certain height position through 30 groups of 20T built-in electric chain block hoisting mechanisms 10, installing expansion rings on the inner walls of the fourth circle of wall plates;
(12) hoisting the tank deck 3 to the circumferential weld position of a third circle of wall plates to be welded through 30 groups of 20T built-in electric chain block hoisting mechanisms 10, keeping the whole tank deck 3 in a hoisting state, assembling and welding steel plates of the third circle of wall plates with the bottom wall of a fourth circle of wall plates one by one, after the third circle of wall plate group is welded, lowering the tank deck 3 through 30 groups of 20T built-in electric chain block hoisting mechanisms 10, pre-supporting and assembling the circumferential weld, in the welding process, the steel plates of each third circle of wall plate are respectively supported by support rings 2, completing the operation of surrounding the third circle of wall plates and assembling the longitudinal weld of the wall plates, after hoisting the tank deck 3 to a certain height position through 30 groups of 20T built-in electric chain block hoisting mechanisms 10, installing expansion rings on the inner walls of the third circle of wall plates;
(13) hoisting the tank deck 3 to the circumferential weld position of a second circle of wall plates to be welded through 30 groups of 20T built-in electric chain block hoisting mechanisms 10, keeping the whole tank deck 3 in a hoisting state, assembling and welding steel plates of the second circle of wall plates with the bottom wall of a third circle of wall plates one by one, after the second circle of wall plate assembly is welded, lowering the tank deck 3 through 30 groups of 20T built-in electric chain block hoisting mechanisms 10, pre-supporting and assembling the circumferential weld, in the welding process, the steel plates of each second circle of wall plate are respectively supported by support rings 2, completing the operation of surrounding the second circle of wall plates and assembling the longitudinal weld of the wall plates, after hoisting the tank deck 3 to a certain height position through 30 groups of 20T built-in electric chain block hoisting mechanisms 10, installing expansion rings on the inner walls of the second circle of wall plates;
(14) lifting the tank top 3 to the circumferential weld position of a first circle of wall plates to be welded through 30 groups of 20T built-in electric chain block lifting mechanisms 10, keeping the whole tank top 3 in a lifting state, welding steel plates of the first circle of wall plates and the bottom wall of a second circle of wall plates in an assembling way one by one, after the welding of the first circle of wall plates is completed, lowering the tank top 3 through 30 groups of 20T built-in electric chain block lifting mechanisms 10, pre-supporting assembly and circumferential weld, in the welding process, the steel plates of each first circle of wall plate are respectively supported by supporting rings 2, leaving the steel plate of the last first circle of wall plate to be not installed, firstly lifting the tank body to a certain height through 30 groups of 20T built-in electric chain block lifting mechanisms 10, then dismantling a plurality of temporary supporting seats 21, then lowering the tank body through 30 groups of 20T built-in electric chain block lifting mechanisms 10 to enable the tank body to directly fall on the tank bottom plate 11, then dismantling 30 groups of 20T built-in electric chain block lifting mechanisms 10 and, and (3) transporting the removed materials out of the gap where the last steel plate is not installed, then installing the last steel plate which is not installed, welding longitudinal welding lines, and then welding circumferential welding lines and large-angle welding lines, namely completing the combined lifting construction operation of the whole low-pressure storage tank body.
Claims (2)
1. A method for lifting the inner part and the outer part of a low-pressure storage tank body in a combined mode is characterized by comprising the following steps:
(1) constructing a tank bottom platform, performing welding operation on the tank bottom platform, welding a plurality of tank bottom steel plates into a whole tank bottom plate, and placing the whole tank bottom plate on the tank bottom platform;
(2) a plurality of temporary supports are welded along the circumferential direction of the tank bottom plate in a spot welding mode, the temporary supports are arranged at equal intervals and enclose a circle of support ring, the ring diameter of the support ring is matched with the outer diameter of the tank body, and a gap between every two adjacent temporary supports is used for allowing personnel and materials to enter and exit;
(3) an umbrella stand is fixed on the bottom plate of the tank and is positioned at the inner side of the support ring;
(4) taking the umbrella stand and the support ring as supports, performing welding operation on the upper sides of the umbrella stand and the support ring, welding a plurality of tank top steel plates and a plurality of pressure-bearing transition section steel plates to obtain a tank top plate and a pressure-bearing transition section, welding the tank top plate and the pressure-bearing transition section to obtain a tank top, and placing the tank top on the support ring;
(5) welding a plurality of external lifting lugs along the outer wall of the pressure-bearing transition section, mounting a plurality of groups of external electric chain block lifting mechanisms on the tank bottom plate at intervals along the outer side of the support ring, hooking a hook of each group of external electric chain block lifting mechanisms on one external lifting lug, lifting the whole tank top to the circumferential weld position of an eighth circle of wall plates to be welded through the plurality of groups of external electric chain block lifting mechanisms, keeping the whole tank top in a lifting state, and removing the umbrella stand;
(6) keeping the whole tank top in a hoisting state, assembling and welding the steel plates of the eighth circle of wall plates with the bottom wall of the tank top one by one, wherein in the welding process, the steel plates of each eighth circle of wall plate are respectively supported by a support ring to complete the operation of surrounding the eighth circle of wall plates and assembling longitudinal seams of the wall plates, and installing expansion rings on the inner walls of the eighth circle of wall plates and welding a plurality of built-in lifting lugs;
(7) after the tank top is lifted to a certain height position through a plurality of groups of external electric chain hoist mechanisms, a plurality of groups of internal electric chain hoist mechanisms are arranged on the tank bottom plate along the inner side of the support ring, and each group of internal electric chain hoist mechanisms are respectively fixed by pulling a rod, so that after the plurality of groups of internal electric chain hoist mechanisms are stressed stably, the hook of each group of internal electric chain hoist mechanisms is hooked on one internal lifting lug, the tank top is lowered through the plurality of groups of external electric chain hoist mechanisms, the bottom surface of the eighth ring of wall plates is placed on the support ring, and the plurality of groups of external electric chain hoist mechanisms and the plurality of external lifting lugs are removed;
(8) hoisting the tank top to the circumferential weld position of a seventh circle of wall plates to be welded through a plurality of groups of built-in electric chain block hoisting mechanisms, keeping the whole tank top in a hoisting state, assembling and welding steel plates of the seventh circle of wall plates with the bottom wall of an eighth circle of wall plates one by one, lowering the tank top through the plurality of groups of built-in electric chain block hoisting mechanisms after the seventh circle of wall plates are assembled and welded, pre-supporting the assembly to the circumferential weld, and in the welding process, supporting the steel plates of each seventh circle of wall plates by support rings respectively to finish the operation of surrounding the seventh circle of wall plates and assembling the longitudinal joints of the wall plates, and then installing expansion rings on the inner walls of the seventh circle of wall plates;
(9) hoisting the tank top to the circumferential weld position of a sixth circle of wall plates to be welded through a plurality of groups of built-in electric chain block hoisting mechanisms, keeping the whole tank top in a hoisting state, assembling and welding steel plates of the sixth circle of wall plates with the bottom wall of a seventh circle of wall plates one by one, lowering the tank top through the plurality of groups of built-in electric chain block hoisting mechanisms after the group butt welding of the sixth circle of wall plates is completed, pre-supporting and assembling the circumferential weld, and performing the operation of surrounding the sixth circle of wall plates and assembling the longitudinal weld of the wall plates, wherein in the welding process, the steel plates of each sixth circle of wall plates are respectively supported by a support ring, and after the tank top is hoisted to a certain height position through the plurality of groups of built-in electric chain block hoisting mechanisms, an expansion ring is installed on;
(10) hoisting the tank top to the circumferential weld position of a fifth circle of wall plates to be welded through a plurality of groups of built-in electric chain block hoisting mechanisms, keeping the whole tank top in a hoisting state, assembling and welding steel plates of the fifth circle of wall plates with the bottom wall of a sixth circle of wall plates one by one, lowering the tank top through the plurality of groups of built-in electric chain block hoisting mechanisms after the fifth circle of wall plates are assembled and welded, pre-supporting and assembling the circumferential weld, in the welding process, the steel plates of each fifth circle of wall plates are respectively supported by a support ring, completing the operation of surrounding the fifth circle of wall plates and assembling the longitudinal joints of the wall plates, hoisting the tank top to a certain height position through the plurality of groups of built-in electric chain block hoisting mechanisms, and then installing expansion rings on the inner wall of the fifth circle of wall;
(11) hoisting the tank top to the circumferential weld position of a fourth circle of wall plates to be welded through a plurality of groups of built-in electric chain block hoisting mechanisms, keeping the whole tank top in a hoisting state, assembling and welding steel plates of the fourth circle of wall plates with the bottom wall of a fifth circle of wall plates one by one, lowering the tank top through the plurality of groups of built-in electric chain block hoisting mechanisms after the fourth circle of wall plates are assembled and welded, pre-supporting and assembling the circumferential weld, in the welding process, the steel plates of each fourth circle of wall plates are respectively supported by a support ring, completing the operation of surrounding the fourth circle of wall plates and assembling the longitudinal joints of the wall plates, hoisting the tank top to a certain height position through the plurality of groups of built-in electric chain block hoisting mechanisms, and then installing expansion rings on the inner wall of the fourth circle of wall;
(12) hoisting the tank top to the circumferential weld position of a third circle of wall plates to be welded through a plurality of groups of built-in electric chain block hoisting mechanisms, keeping the whole tank top in a hoisting state, assembling and welding steel plates of the third circle of wall plates with the bottom wall of a fourth circle of wall plates one by one, lowering the tank top through the plurality of groups of built-in electric chain block hoisting mechanisms after the third circle of wall plates are assembled and welded, pre-supporting and assembling the circumferential weld, in the welding process, the steel plates of each third circle of wall plates are respectively supported by a support ring, completing the operation of surrounding the third circle of wall plates and assembling the longitudinal joints of the wall plates, hoisting the tank top to a certain height position through the plurality of groups of built-in electric chain block hoisting mechanisms, and then installing expansion rings on the inner wall of the third circle of wall;
(13) hoisting the tank top to the circumferential weld position of a second circle of wall plates to be welded through a plurality of groups of built-in electric chain block hoisting mechanisms, keeping the whole tank top in a hoisting state, assembling and welding steel plates of the second circle of wall plates with the bottom wall of a third circle of wall plates one by one, lowering the tank top through the plurality of groups of built-in electric chain block hoisting mechanisms after the assembly and the welding of the second circle of wall plates are completed, pre-supporting and assembling the circumferential weld, supporting the steel plates of each second circle of wall plates by support rings in the welding process, completing the operation of surrounding the second circle of wall plates and assembling the longitudinal joints of the wall plates, hoisting the tank top to a certain height position through the plurality of groups of built-in electric chain block hoisting mechanisms, and installing expansion rings on the inner wall of the second circle of wall plates;
(14) hoisting the tank top to the circumferential weld position of a first circle of wall plates to be welded through a plurality of groups of built-in electric chain block hoisting mechanisms, keeping the whole tank top in a hoisting state, assembling and welding steel plates of the first circle of wall plates with the bottom wall of a second circle of wall plates piece by piece, lowering the tank top through the plurality of groups of built-in electric chain block hoisting mechanisms after the first circle of wall plates are assembled and welded, pre-supporting and assembling the circumferential weld, in the welding process, the steel plates of each first circle of wall plates are respectively supported by a support ring, leaving the steel plates of the last first circle of wall plates not to be installed, integrally hoisting the tank body to a certain height through the plurality of groups of built-in electric chain block hoisting mechanisms, then dismantling a plurality of temporary supports, lowering the tank body through the plurality of groups of built-in electric chain block hoisting mechanisms, enabling the tank body to directly fall on the tank bottom plate, then dismantling the plurality of groups of built-in electric chain block hoisting mechanisms and the, and then installing the last steel plate which is not installed, welding a longitudinal welding line, and then welding a circumferential welding line and a large-angle welding line, namely completing the combined lifting construction operation of the whole low-pressure storage tank body.
2. The method as claimed in claim 1, wherein the low pressure tank is 10000m in height3The low-pressure storage tank, the external electronic chain block hoist mechanism of multiunit be 28 external electronic chain block hoist mechanism of group 10T, the built-in electronic chain block hoist mechanism of multiunit be 30 internal electronic chain block hoist mechanism of group 20T.
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Cited By (1)
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