Large-span oil tank chamber construction method
By using the reverse construction method and the application of steel truss platform formwork, the problems of high construction difficulty and poor safety of large-span oil tank chambers have been solved, achieving low-cost and high-quality construction results, which are suitable for cold environments.
Patent Information
- Application Number
- CN202511709978.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-20
- Publication Date
- 2025-12-19
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The construction of existing large-span oil tank chambers is difficult, unsafe, and costly, especially in cold environments where it is difficult to guarantee quality and extend the construction period.
The reverse construction method is adopted. First, the dome is constructed on the ground, and then the tank wall is constructed by excavation downwards. The steel truss platform formwork is spliced on the ground, and materials are transported by winches and derricks to form a relatively closed space for concrete curing, reducing the need for high-altitude operations and large equipment.
It significantly reduces construction costs and time, improves construction quality and safety, is suitable for construction in cold environments, and shortens concrete curing time.
Smart Images
Figure CN121162091A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to a kind of earth-covered oil tank chamber construction method, specifically a kind of large-span oil tank chamber construction method. BACKGROUND
[0002] The earth-covered large oil tank concrete structure, due to its large span, generally adopts dome structure on top.In the prior art, the construction is carried out by using the normal method, i.e., first digging a foundation pit, then constructing the oil tank foundation, then constructing the tank wall and erecting the full-frame scaffold, finally pouring the concrete dome formwork, binding the steel bars, pouring the concrete, curing and then removing the formwork.The entire construction period is about 100 days, and the cost is very high.Due to the large span of the dome, the construction is difficult, the safety of the full-frame scaffold is poor, and the construction quality is difficult to guarantee.
[0003] In addition, especially when the construction is carried out in cold weather, the low ambient temperature increases the difficulty of concrete curing, further increases the construction period and cost, and makes it difficult to guarantee the quality of the tank chamber structure.
[0004] Therefore, there is an urgent need for a new large-span oil tank chamber construction method that can greatly reduce construction cost and construction period, and ensure quality and safety, and is especially suitable for construction in cold weather. SUMMARY
[0005] The purpose of the present application is to provide a large-span oil tank chamber construction method to solve the existing problems.
[0006] The present application is implemented as follows: a large-span oil tank chamber construction method, comprising the following steps.
[0007] a. Positioning and setting out the oil tank concrete chamber, determine the position and size of the tank wall.
[0008] b. Dig a foundation pit according to the elevation of the tank wall top ring beam, and construct a concrete ring beam and corbel at the edge of the foundation pit.
[0009] c. Assemble and construct the steel truss platform formwork in the foundation pit.
[0010] d. Assemble and install the dome formwork on the steel truss platform formwork, and bind the dome steel bars on the dome formwork.
[0011] e. Pour and cure the dome concrete, and remove the steel truss platform formwork and formwork after curing.
[0012] f. Set up a derrick in the center of the foundation pit, the derrick passes through the structural hole in the center of the dome, set up a winch on the ground, and set up a crown block on the top of the derrick, the winch pulls the hopper through the crown block.
[0013] g. The remaining part of the tank wall is divided into several segments according to the top-down method.
[0014] h. The earthwork excavation construction of the next segment height is carried out, the earthwork is transported to the ground through the winch and the hopper, and the derrick height is adjusted as the bottom surface height of the foundation pit decreases.
[0015] i. The construction of the segment of the tank wall is carried out.
[0016] j. Steps h and i are repeated until the construction of all remaining parts of the tank wall is completed.
[0017] k. The construction of the oil tank foundation and the tank room foundation is carried out.
[0018] Further, a hanging beam is arranged outside the ring beam. The hanging beam structure ensures that the superstructure does not sink during the top-down construction.
[0019] Further, a transportation platform is arranged on the ground, the transportation platform is fixed on the ground through a support, and the transportation platform extends to the construction hole at the center of the dome. The transportation platform can quickly transport materials between the ground and the construction hole of the dome.
[0020] Further, the steel truss platform formwork comprises a central rigid ring, radial trusses and ring supports, in step c, the scaffold platform is erected in the foundation pit, the central rigid ring is installed on the scaffold platform, one end of the radial trusses is installed on the corbel at the top of the tank wall, the other end is connected to the central rigid ring, and the ring supports are installed after the connection is completed. The splicing and installation of the entire steel truss platform formwork are carried out on the ground, which can greatly reduce the difficulty of splicing and installation.
[0021] Further, in step i, the winch and the hopper are used to transport and pour the concrete required for the construction of the tank wall.
[0022] Further, the derrick is composed of a plurality of standard sections, and the height of the derrick is adjusted by increasing or decreasing the number of standard sections.
[0023] Further, when excavating the earthwork, the earthwork around the derrick is excavated first, the earthwork directly below the derrick is reserved, the standard section above the derrick is connected to the construction hole of the dome after the connection, the earthwork directly below the derrick is excavated and the standard section is added at the bottom of the derrick, and the contact stress between the derrick and the bottom of the foundation pit is restored.
[0024] Further, the present application also comprises: after the construction of the oil tank foundation and the tank room foundation is completed, the construction of the internal steel oil tank is carried out, the tank body steel plate is transported through the winch and the derrick, the tank body is constructed by adopting the inverted chain inversion method, and the derrick and the winch are removed after the construction of the tank body is completed.
[0025] The steel truss platform formwork of the application is spliced and installed on the ground, without high-altitude operation and large construction machine, so that the work efficiency is improved and the construction cost is reduced. Since the dome is constructed first, a relatively closed space is formed below the dome, so that the heat preservation can be well done in the cold environment during the tank wall construction by the reverse construction method, the concrete curing time in the cold environment is shortened, and the construction quality is ensured. BRIEF DESCRIPTION OF DRAWINGS
[0026] Fig. 1 is a schematic diagram of the dome concrete construction of the application.
[0027] Fig. 2 is a schematic diagram of the first-stage tank wall construction of the application.
[0028] Fig. 3 is a schematic diagram of the second-stage tank wall construction of the application.
[0029] Fig. 4 is a schematic diagram of the third-stage tank wall construction of the application.
[0030] In the figure: 1, foundation pit; 2, ring beam; 3, hanging beam; 4, steel truss platform formwork; 5, formwork; 6, dome; 7, derrick; 8, head sheave; 9, winch; 10, transport platform; 11, support; 12, hopper; 13, tank wall. DETAILED DESCRIPTION
[0031] The technical solutions of the application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are some of the embodiments of the application, but not all the embodiments. Based on the embodiments of the application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.
[0032] In the description of the application, it should be noted that the orientations or positional relationships indicated by the terms “center”, “upper”, “lower”, “left”, “right”, “vertical”, “horizontal”, “inner”, “outer” and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. In addition, the terms “first”, “second”, “third” and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance.
[0033] As Figs. 1 to 4As shown, the present application is a large-span tank chamber construction method, which adopts the mode of first constructing the dome 6 on the ground and then excavating downward and constructing the tank wall 13, thereby reducing the difficulty of dome 6 construction and effectively ensuring the safety and construction quality of dome 6 construction.
[0034] The method specifically comprises the following steps.
[0035] a. First, the oil tank concrete tank chamber is positioned and laid out, and the tank wall 13 position and size are determined.
[0036] b. According to the elevation of the tank wall 13 top ring beam 2, a foundation pit 1 is excavated, a relatively shallow foundation pit 1 is excavated at the ground layout position, the bottom surface height of the foundation pit 1 is consistent with the elevation of the bottom surface of the ring beam 2, formwork is erected at the edge of the foundation pit 1, and concrete ring beam 2 and corbel pouring construction are carried out, thereby obtaining a ring beam 2 with an inner side with corbel, the corbel is located at the bottom of the ring beam 2 and is uniformly distributed around the center of the ring beam 2, the corbel is used for installing a steel truss platform formwork 4, and the number and position of the corbel are determined according to the steel truss platform formwork 4.
[0037] A hanging beam 3 is arranged at the outer circle of the ring beam 2, the hanging beam 3 is located at the upper part of the ring beam 2, the hanging beam 3 is embedded into the side wall of the foundation pit 1, and the subsequent top structure is prevented from sinking during the reverse construction method construction through the structure of the hanging beam 3.
[0038] c. Steel truss platform formwork 4 assembly construction is carried out in the foundation pit 1.
[0039] The steel truss platform formwork 4 specifically comprises a central rigid ring, a radial truss, and a ring support. During the assembly construction of the steel truss platform formwork 4, first, a scaffold platform is erected in the foundation pit 1, the central rigid ring is installed on the scaffold platform, one end of the radial truss is installed on the corbel at the top of the tank wall 13, the other end is connected to the central rigid ring, the ring support is installed after the connection is completed, and thus the steel truss platform formwork 4 is obtained.
[0040] The entire steel truss platform formwork 4 assembly and installation are carried out on the ground of the shallow foundation pit 1, which can greatly reduce the difficulty of assembly and installation and easily ensure the safety and quality of the construction process. The entire process does not require large hoisting equipment, thereby saving costs.
[0041] The steel truss platform formwork 4 is a spliced structure and is connected by bolts, which is convenient for disassembly and subsequent turnover use.
[0042] d. After the steel truss platform formwork 4 construction is completed, the dome 6 formwork 5 is assembled and installed on the steel truss platform formwork 4, and then the dome 6 steel bar binding is carried out on the dome 6 formwork 5.
[0043] e. Perform the concrete pouring and curing construction of the dome 6. The dome 6 concrete adopts early strength concrete, and the 7-day strength of the standard sample can reach 100%, so as to ensure the 4-week turnover of the steel truss platform formwork 4, greatly reduce the formwork measure cost, and be especially suitable for the construction conditions of the oil tank group. The pouring is performed in a spiral ascending method from the lower part to the upper part.
[0044] A construction hole is designed in the center of the dome 6. After the curing is completed, the steel truss platform formwork 4 and the formwork 5 are removed, and the steel truss platform formwork 4 and the formwork 5 are taken out through the construction hole.
[0045] f. After the dome 6 construction is completed and the steel truss platform formwork 4 and the formwork 5 are removed, an operating space with a certain height is formed below the dome 6, and the subsequent earth excavation construction is performed in the space. In order to facilitate the earth excavation and the material transportation, a derrick 7 is arranged in the center of the foundation pit 1, the derrick 7 passes through the construction hole in the center of the dome 6, the upper end of the derrick 7 extends out of the dome 6, a winch 9 is arranged on the ground, a crown block 8 is arranged on the top of the derrick 7, and the steel wire rope of the winch 9 is pulled through the crown block 8 to pull a bucket 12. The derrick 7 is mainly used to bear the gravity of the material when the material is transported on and off the bucket 12, and the construction hole of the dome 6 has a certain limiting effect on the derrick 7, so the stability of the connection between the derrick 7 and the bottom of the foundation pit 1 is low, and only the bottom surface needs to be kept flat and the derrick 7 needs to be stably placed on the bottom surface.
[0046] At the same time, in order to facilitate the transportation of the material between the ground and the construction hole of the dome 6, a transportation platform 10 is also arranged on the ground, the transportation platform 10 is fixed on the ground through a support 11, and the transportation platform 10 extends to the construction hole in the center of the dome 6. The transportation platform 10 is mainly supported by the support 11, which can reduce the stress of the dome 6 in the material transportation process.
[0047] g. The remaining part of the tank wall 13 is divided into several segments according to the top-down method.
[0048] In this embodiment, the remaining part of the tank wall 13 is divided into three segments from top to bottom, and the construction of the tank wall 13 needs to be implemented through three times of pouring.
[0049] h. The earth excavation construction of the first segment of the tank wall 13 corresponding height is performed, the excavated earth is transported to the construction hole of the dome 6 through the winch 9 and the bucket 12, and then transported to the ground through the transportation platform 10.
[0050] During the excavation process, the height of the bottom surface of the foundation pit 1 gradually decreases, and the height of the derrick 7 is adjusted along with the decrease of the height of the bottom surface of the foundation pit 1.
[0051] Firstly, the derrick 7 is composed of a plurality of standard sections, the derrick 7 is a rectangular steel frame structure penetrating from top to bottom, the standard sections are connected to each other through bolts, and the height of the derrick 7 can be adjusted by increasing or reducing the number of standard sections.
[0052] In the process of earth excavation, the earth around the derrick 7 is excavated first, and the earth directly below the derrick 7 is reserved. When the height difference between the ground directly below the derrick 7 and the bottom of the foundation pit 1 is close to a standard section height, the standard section increasing operation is performed. The standard section increasing operation is as follows: first, connect the standard section above the derrick 7 with the construction hole of the dome 6, so that the dome 6 bears the gravity of the derrick 7 itself. At this time, the hopper 12 and the winch 9 are stopped from being used, and the hopper 12 needs to be emptied to reduce the stress on the dome 6. After determining that the derrick 7 is connected with the construction hole of the dome 6, the earth directly below the derrick 7 is excavated, and a standard section is added to the bottom of the derrick 7. The ground below the bottom of the derrick 7 is filled and compacted to ensure that the derrick 7 is in contact with the bottom of the foundation pit 1 and bears the stress.
[0053] A frame rod or the like can be erected above the construction hole of the dome 6 to support the derrick 7. The frame rod can span above the construction hole and support the derrick 7, or the derrick 7 can be connected with the construction hole through a connecting rod or a connecting plate to temporarily fix it.
[0054] i. After the excavation of the earth corresponding to the first section of the tank wall 13 is completed, the earth side wall is trimmed as the outer formwork 5 for pouring the tank wall 13. The inner formwork 5 is erected inside to pour the first section of the tank wall 13. The formwork 5 and the concrete are transported by the winch 9 and the hopper 12.
[0055] j. Repeat steps h and i to complete the construction of the second section of the tank wall 13 and the third section of the tank wall 13.
[0056] k. After the tank wall 13 is partially constructed by the top-down method, the construction of the oil tank foundation and the tank room foundation is performed.
[0057] Most of the tank wall 13 of the present application is constructed after the dome 6 is completed. Due to the existence of the dome 6, the foundation pit 1 forms a relatively closed space, which can maintain a relatively high temperature inside in cold environments or weather, so that the partially poured concrete of the tank wall 13 can be cured at a suitable temperature, which can greatly reduce the curing time and improve the quality of the tank wall 13.
[0058] The present application also includes: after the construction of the oil tank foundation and the tank room foundation is completed, the construction of the internal steel oil tank is performed. The tank body steel plate is transported by the winch 9 and the derrick 7, and the tank body is constructed by the inverted chain inversion method. After the construction of the tank body is completed, the derrick 7 and the winch 9 are removed.
[0059] The above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions recorded in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.
Claims
1. A construction method for a large-span oil tank chamber, characterized in that, Includes the following steps: a. Locate and lay out the concrete tank chamber of the oil tank to determine the position and dimensions of the tank wall; b. Excavate the foundation pit according to the elevation of the ring beam at the top of the tank wall, and construct the concrete ring beam and corbel at the edge of the foundation pit; c. Assemble the steel truss platform formwork within the foundation pit; d. Assemble and install the dome formwork on the steel truss platform formwork, and tie the dome reinforcement on the dome formwork; e. Carry out the concrete pouring and curing of the dome, and remove the steel truss platform formwork and template after curing is completed; f. A derrick is set up in the center of the pit, passing through the structural hole in the center of the dome. A winch is set up on the ground, and a sheave is set up on the top of the derrick. The winch pulls the hopper through the sheave. g. Divide the remaining portion of the tank wall into several height sections using the reverse construction method; h. Carry out the earthwork excavation work at the next height, and transport the earthwork to the ground using a winch and hopper. Adjust the height of the derrick as the bottom of the pit decreases. i. Carry out the construction of this section of the tank wall; j. Repeat steps h and i until all remaining parts of the tank wall have been constructed; k. Carry out the construction of the oil tank foundation and tank room foundation.
2. The construction method for a large-span oil tank chamber according to claim 1, characterized in that, A hanging beam is provided on the outer ring of the ring beam.
3. The construction method for a large-span oil tank chamber according to claim 1, characterized in that, A transport platform is set up on the ground, which is fixed to the ground by a bracket, and the transport platform extends to the structural hole at the center of the dome.
4. The construction method for a large-span oil tank chamber according to claim 1, characterized in that, The steel truss platform formwork includes a central rigid ring, radial trusses, and circumferential supports. In step c, a scaffolding platform is erected in the foundation pit, and the central rigid ring is installed on the scaffolding platform. One end of the radial truss is installed on the corbel at the top of the tank wall, and the other end is connected to the central rigid ring. After the connection is completed, the circumferential supports are installed.
5. The construction method for a large-span oil tank chamber according to claim 1, characterized in that, In step i, the concrete required for pouring the tank wall is transported by a winch and a hopper.
6. The construction method for a large-span oil tank chamber according to claim 1, characterized in that, The derrick is composed of several standard sections, and the height of the derrick can be adjusted by increasing or decreasing the number of standard sections.
7. The construction method for a large-span oil tank chamber according to claim 6, characterized in that, During earthwork excavation, the earthwork around the derrick is excavated first, while the earthwork directly below the derrick is preserved. After connecting the standard section above the derrick to the dome structure hole, the earthwork directly below the derrick is excavated and a standard section is added at the bottom of the derrick to restore the contact force between the derrick and the bottom of the pit.
8. The construction method for a large-span oil tank chamber according to claim 1, characterized in that, Also includes: After the construction of the oil tank foundation and tank room foundation is completed, the construction of the internal steel oil tank is carried out. The steel plates of the tank are transported by winch and derrick, and the tank is constructed by chain hoisting. After the tank is completed, the derrick and winch are dismantled.