An installation method for the central support column of a large-diameter structure

Abstract

The present invention provides a method for installing a central support column of a large-diameter structure, including: when installing the central support column and radial beams of a thickener, reserving a hoisting opening; protecting the bolts on the thickener column foundation located at the position of the reserved hoisting opening; carrying out layered backfilling and compaction on the foundation area where the reserved hoisting opening is located until the preset backfill compaction coefficient is reached; after the backfilling at the position of the reserved hoisting opening is completed, laying graded broken stones with a preset thickness thereon and rolling them; selecting a crane with a target tonnage according to the weight, height of the reserved hoisting opening, central support column and the surrounding hoisting environment, so that the crane with the target tonnage is in place through the reserved hoisting opening, and hoisting the central support column of the thickener in place. The method for installing the central support column of the large-diameter structure provided by the present invention can shorten the hoisting radius of the crane, reduce the tonnage of the crane used, and greatly reduce the hoisting cost by hoisting through the reserved hoisting opening.

Description

Technical Field

[0001] The present invention relates to the technical field of thickener installation, and more particularly, to a method for installing a central support column of a large-diameter structure. Background Art

[0002] Nickel is a very important non-ferrous metal raw material for manufacturing stainless steel. In the wet process for treating laterite nickel ore, CCD washing is a key link, and in the CCD washing process, a thickener is the main equipment.

[0003] The thickeners commonly used in the conventional high-pressure acid leaching process of laterite nickel ore generally have diameters of 36m, 42m or 45m, and usually do not have a central support column. The driving devices such as rake shafts are hung upside down on the full-through bridge above the upper part of the thickener. Even if a column is provided in the center of some thickeners, due to the small diameter of the thickener and technological reasons, the height of the column is small (generally less than 5m) and the weight is not large (generally less than 3T). For a large-diameter center-driven thickener, the top of the thickener is a semi-through bridge. According to technological and equipment requirements, a support column is provided in the center of the thickener, which is located on the concrete foundation at the center position of the thickener. The conventional installation method is to first install the entire tank body of the thickener, and after the tank body is installed, then hoist and install the driving equipment and other components of the thickener outside the span. However, for a large-diameter center-driven thickener, its support column is in the shape of a circular cylinder, with a large outer diameter, high height and heavy weight. If the conventional method of hoisting the central support column outside the span is used, at least a crane with a large tonnage is required to implement, which will undoubtedly increase the construction cost, extend the construction period and increase the safety risk. Summary of the Invention

[0004] In view of this, the present invention provides a method for installing a central support column of a large-diameter structure, aiming to solve the problems of high economic cost and large safety risk existing in the installation process of the central support column of the existing large-diameter structure.

[0005] The present invention provides a method for installing a central support column of a large-diameter structure, comprising the following steps:

[0006] Step 1, when installing the central support column and radial beam of the thickener, reserve a hoisting opening;

[0007] Step 2, protect the bolts on the thickener column foundation located at the reserved hoisting opening position;

[0008] Step 3, backfill and compact the foundation area where the reserved hoisting opening is located in layers until the preset backfill compaction coefficient is reached;

[0009] Step 4, after the backfill at the reserved hoisting opening position is completed, lay graded crushed stone with a preset thickness on it and roll it.

[0010] Step 5: Select a crane with a target tonnage according to the weight and height of the reserved lifting opening, the central support column, and the surrounding lifting environment, so that the crane with the target tonnage is in place through the reserved lifting opening, and hoist the central support column of the thickener into place.

[0011] Further, in the method for installing the central support column of the large-diameter structure, the lifting opening has a fan-shaped structure.

[0012] Further, in the method for installing the central support column of the large-diameter structure, in Step 2, a protective box is provided on the top of each thickener column foundation, the protective box is covered on the embedded bolts, and is higher than the embedded bolts by a preset height.

[0013] Further, in the method for installing the central support column of the large-diameter structure, the preset height is 2 - 8 cm.

[0014] Further, in the method for installing the central support column of the large-diameter structure, a support column is provided inside the protective box.

[0015] Further, in the method for installing the central support column of the large-diameter structure, there is a gap between each side wall of the protective box and the edge of the foundation.

[0016] Further, in the method for installing the central support column of the large-diameter structure, the protective box is made of steel plate.

[0017] Further, in the method for installing the central support column of the large-diameter structure, the preset backfill compaction coefficient ≥ 0.94.

[0018] Further, in the method for installing the central support column of the large-diameter structure, the preset thickness is 200 - 500 mm.

[0019] Further, in the method for installing the central support column of the large-diameter structure, in Step 4, the vibration operation needs to be stopped when rolling the graded crushed stone to above the foundation of the radial beam.

[0020] In the method for installing the central support column of the large-diameter structure in the present invention, hoisting is carried out through the reserved lifting opening, which can shorten the hoisting radius of the crane, reduce the used tonnage of the crane, avoid using large-tonnage cranes, greatly reduce the hoisting cost, and improve the operation safety factor at the same time; and after the reserved lifting opening is reserved, the installation of the thickener tank body and the central support column of the thickener and the upper structure of the column can be constructed simultaneously, which can greatly save the construction period. Description of the Drawings

[0021] Upon reading the following detailed description of the preferred embodiments, various other advantages and benefits will become apparent to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention. Also, throughout the drawings, the same reference numerals are used to denote the same components. In the drawings:

[0022] Figure 1 It is a schematic structural diagram of a reserved hoisting opening in the installation method of the central support column of a large-diameter structure provided by an embodiment of the present invention;

[0023] Figure 2 It is a backfill profile view of the crane station position in the installation method of the central support column of a large-diameter structure provided by an embodiment of the present invention;

[0024] Figure 3 It is a plan view of the crane station position in the installation method of the central support column of a large-diameter structure provided by an embodiment of the present invention;

[0025] Figure 4 It is a hoisting schematic diagram of the support column in the installation method of the central support column of a large-diameter structure provided by an embodiment of the present invention. Detailed Embodiments

[0026] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be completely conveyed to those skilled in the art. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0027] Refer to Figure 1 , the installation method of the central support column of the large-diameter structure in the embodiment of the present invention includes the following steps:

[0028] Step 1, when installing the central support column 3 and the radial beam 2 of the thickener, reserve a hoisting opening a.

[0029] Specifically, considering factors such as the crane station position, the shape of the central support column 3, and the rotation radius of the crane boom, when installing the thickener column 3 and the radial beam 2, reserve a hoisting opening a without carrying out installation operations temporarily, and use it as the hoisting working surface for the central support column 3; the hoisting opening has a fan-shaped structure, and the central angle of this fan-shaped structure can be 90°. The reserved hoisting opening a is radially perpendicular to the installation direction of the bridge 1, and the circumferential opening is 90°. The tank support columns, crossbeams, and diagonal braces within the hoisting opening range are not installed.

[0030] Of course, before installing the columns and radial beams, site preparation is required, including: after the construction of the thickener foundation is completed, transporting the materials required for thickener installation to the vicinity of the foundation; at the same time, giving safety and technical briefings to the workers; then conducting foundation measurement and setting out, and carrying out process handover.

[0031] Step 2, protect the bolts on the thickener column foundation located at the reserved hoisting opening position.

[0032] Specifically, referring to Figure 2 , a protective box is provided at the top of each thickener column foundation 7, the protective box is covered on the embedded bolt, and is higher than the embedded bolt by a preset height. The preset height is 2 - 8 cm, preferably 5 cm. In this embodiment, covering the protective box 4 on the top of the embedded bolt 6 can prevent the embedded bolt from being damaged during backfilling and compaction and when the crane travels, and can also reduce the workload of cleaning the foundation bolts after the installation of the thickener columns is completed.

[0033] The protective box can be a square box with an open bottom, and a support column 8 is welded at the middle position inside it. The support column 8 can be a steel bar, which is welded to the protective box 4, and the height of the support column is the same as the internal height of the protective box. The support column uses an inverted "U" - shaped steel bar to support the middle part of the protective box.

[0034] In this embodiment, there is a gap between each side wall of the protective box and the edge of the foundation. In practice, a 5 - cm gap can be maintained between the side wall of the protective box and the edge. The protective box can be welded by multiple steel plates. In this embodiment, after the central support column is hoisted in place, the removed bolt protective box can be recycled, saving materials.

[0035] Step 3, backfill and compact the foundation area where the reserved hoisting opening is located in layers until the preset backfill compaction coefficient is reached.

[0036] Specifically, the preset backfill compaction coefficient ≥ 0.94. Backfill the whole to a height 200 mm higher than the bolt protective box to prevent damage to the protective box during operation.

[0037] Step 4, after the backfill at the reserved hoisting opening position is completed, lay a preset thickness of graded broken stone on it and roll it.

[0038] Specifically, the preset thickness is 200 - 500 mm, preferably 300 mm. The graded broken stone can be vibrated and rolled 3 to 5 times by a roller.

[0039] Furthermore, when rolling the graded broken stone to above the steel column foundation of the radial beam, the vibration operation needs to be stopped to prevent the displacement of the steel column foundation. Here, the steel column foundation refers to the pillar supporting under each radial beam.

[0040] Step 5, refer to Figure 3 and Figure 4 , select a crane 5 with a target tonnage according to the reserved lifting opening, the weight and height of the central support column, and the surrounding lifting environment, so that the crane with the target tonnage is in place through the reserved lifting opening, and hoist the central support column of the thickener into place.

[0041] Specifically, the model of the crane can be determined according to the weight of the central support column to be hoisted and the standing position (lifting radius) of the crane.

[0042] The installation method provided in this embodiment can be applied to the installation process of the central support columns of thickeners with various large diameters. For example, for the 55-meter center-driven thickener used in the high-pressure acid leaching process of laterite nickel ore, after calculation, it is determined that a 130T crane can meet the lifting requirements. The boom is selected to be 40m, the lifting radius is 12m, the maximum lifting weight is 45.3t, and the standing position of the crane from the center can be 12m. The crane is in place through the reserved lifting opening, hoist the central support column of the thickener into place, and ensure that the verticality of the central support column is less than or equal to 1 / 1000mm, the center line deviation is not greater than 1.5mm, and the elevation error is within ±2mm.

[0043] In summary, the installation method of the central support column of the large-diameter structure provided by the present invention can shorten the lifting radius of the crane, reduce the use tonnage of the crane, avoid using large-tonnage cranes, and greatly reduce the lifting cost by hoisting through the reserved lifting opening; and after the reserved lifting opening is reserved, the installation of the thickener tank body and the central support column and the upper structure of the column of the thickener can be constructed simultaneously, which can greatly save the construction period as a whole. In addition, the embedded bolts on the column foundation are protected, which can not only prevent the embedded bolts from being damaged during backfilling and compaction and when the crane is walking, but also reduce the workload of cleaning the foundation bolts after the thickener column is installed.

[0044] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these changes and modifications.

Claims

1. Installation method for central support column of large-diameter structure Characterized in that It includes the following steps: Step 1, when installing the central support column and radial beam of the thickener, reserve a lifting opening; the lifting opening is in a fan-shaped structure, and the central angle of the fan-shaped structure is 90°; Step 2, protect the bolts on the thickener column foundation located at the reserved lifting opening position; set a protection box on the top of each thickener column foundation, cover the protection box on the bolts, and the protection box is higher than the bolts by a preset height; Step 3, backfill and compact the foundation area where the reserved lifting opening is located in layers until the preset backfill compaction coefficient is reached; Step 4, after backfilling at the reserved lifting opening position, lay graded crushed stone with a preset thickness on it and roll it; Step 5, select a crane with a target tonnage according to the weight, height of the reserved lifting opening, central support column and the surrounding lifting environment, so that the crane with the target tonnage is in place through the reserved lifting opening, and hoist the central support column of the thickener into place.

2. The installation method for the central support column of the large-diameter structure according to claim 1, Characterized in that The preset height is 2 - 8 cm.

3. The installation method for the central support column of the large-diameter structure according to claim 1, Characterized in that Support columns are arranged inside the protection box.

4. The installation method for the central support column of the large-diameter structure according to claim 1, Characterized in that There are gaps between the side walls of the protection box and the edge of the foundation.

5. The installation method for the central support column of the large-diameter structure according to claim 1, Characterized in that The protection box is made of steel plate.

6. The installation method for the central support column of the large-diameter structure according to claim 1, Characterized in that The preset backfill compaction coefficient ≥ 0.

94.

7. The installation method for the central support column of the large-diameter structure according to claim 1, Characterized in that The preset thickness is 200 - 500 mm.

8. The installation method for the central support column of the large-diameter structure according to claim 1, Characterized in that In step 4, when rolling the graded crushed stone above the foundation of the radial beam, the vibration operation needs to be stopped.

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