A construction method for an erected thickener

Abstract

The present application provides a construction method for a standing thickener, which relates to the field of metallurgical mine construction. The construction method for the standing thickener includes surveying and setting out, erecting a scaffold, fixing a casting formwork, and pouring concrete into each casting formwork. The surveying and setting out includes determining the central position of the thickener on the horizontal plane and determining the height positions in the vertical direction of the upper surface and the lower surface of the bottom wall of the thickener. The erection of the scaffold includes erecting a central scaffold according to the central position of the thickener on the horizontal plane, and circumferentially erecting a side scaffold with the central position of the thickener on the horizontal plane as the center, and fixing the top scaffold to the side scaffold. By determining the central position of the thickener on the horizontal plane, then erecting the side scaffold around according to the central position of the thickener, and then erecting the top scaffold according to the height position in the vertical direction of the lower surface of the bottom wall of the thickener, a relatively accurate spatial position of the thickener can be obtained, which is convenient for centering the thickener and erecting the overall framework.

Description

Technical Field

[0001] This application relates to the field of metallurgical mine construction. Specifically, it relates to a construction method for a towering thickener. Background Art

[0002] The construction of a towering pot-shaped thickener has relatively more difficulties. If the measures are not effective, dimensional deviations will occur. In particular, the accuracy of determining the plane center position and the spatial height position directly affects the installation accuracy of subsequent equipment. Summary of the Invention

[0003] An embodiment of this application provides a construction method for a towering thickener to improve the problem of low construction accuracy of existing thickeners.

[0004] An embodiment of this application provides a construction method for a towering thickener, including surveying and setting out, erecting a scaffold, fixing casting forms, and pouring concrete into each casting form. The surveying and setting out includes determining the center position of the thickener on the horizontal plane and determining the height positions of the upper surface and the lower surface of the bottom wall of the thickener in the vertical direction. Erecting the scaffold includes erecting a central scaffold according to the center position of the thickener on the horizontal plane, circumferentially erecting a side scaffold with the center position of the thickener on the horizontal plane as the center, and then erecting a top scaffold according to the height position of the lower surface of the bottom wall of the thickener in the vertical direction, and fixing the top scaffold to the side scaffold. Fixing the casting forms includes fixing a plurality of circumferential support column casting forms on the side scaffold, fixing a central support column casting form on the circumferential wall of the central scaffold, fixing a thickener bottom wall casting form and a thickener side wall casting form on the top scaffold, and the plurality of circumferential support column casting forms are located below the thickener bottom wall casting form.

[0005] In the above technical solution, by determining the center of the thickener on the horizontal plane and the height position in the vertical direction, then circumferentially erecting a side scaffold around the center position of the thickener, and then erecting a top scaffold according to the height position of the lower surface of the bottom wall of the thickener in the vertical direction, and fixing the top scaffold on the side scaffold, a relatively accurate spatial position of the thickener can be obtained, which is convenient for centering the thickener and erecting the overall framework.

[0006] In addition, the construction method of the towering thickener in the embodiment of this application also has the following additional technical features:

[0007] In some embodiments of this application, fixing the thickener bottom wall casting form on the top scaffold includes: fixing six sector-shaped casting forms on the top scaffold, and the central angle of each sector-shaped casting form is 60°.

[0008] In the above technical solution, the formwork for pouring the bottom wall of the thickening tank is divided into six sector-shaped pouring modules with a central angle of 60°, which can pour the bottom wall of the thickening tank in areas, improve the pouring quality of the bottom wall of the thickening tank, and facilitate the formation of a high-quality bottom wall of the thickening tank.

[0009] In some embodiments of the present application, the upper surface of the bottom wall of the thickening tank includes a first annular surface with a first slope, a second annular surface with a second slope, and a third annular surface with a third slope. The first slope is less than the second slope, and the second slope is less than the third slope. The first annular surface, the second annular surface, and the third annular surface are connected in sequence; determining the height of the upper surface of the bottom wall of the thickening tank includes: the height of the outer ring of the first annular surface and the height of the inner ring of the first annular surface; determining the height of the outer ring of the second annular surface and the height of the inner ring of the second annular surface; determining the height of the outer ring of the third annular surface and the height of the inner ring of the third annular surface.

[0010] In the above technical solution, the bottom wall of the thickening tank has three slopes that increase in sequence from the edge of the thickening tank towards the center of the thickening tank. Such a thickening tank is convenient for sewage treatment. By determining the height of the outer ring and the inner ring of the first annular surface, determining the height of the outer ring and the inner ring of the second annular surface, and determining the height of the outer ring and the inner ring of the third annular surface, the slopes (tilt angles) of the first annular surface, the second annular surface, and the third annular surface can be accurately determined, and the accuracy of the formed thickening tank is higher.

[0011] In some embodiments of the present application, the lower surface of the bottom wall of the thickening tank includes a first annular bottom surface with a first slope, a second annular bottom surface with a second slope, and a third annular bottom surface with a third slope. The first annular bottom surface, the second annular bottom surface, and the third annular bottom surface are connected in sequence; determining the height of the lower surface of the thickening tank includes: determining the height of the outer ring of the first annular bottom surface and the height of the inner ring of the first annular bottom surface; determining the height of the outer ring of the second annular bottom surface and the height of the inner ring of the second annular bottom surface; determining the height of the outer ring of the third annular bottom surface and the height of the inner ring of the third annular bottom surface.

[0012] In the above technical solution, the lower surface of the bottom wall of the thickening tank also includes three annular bottom surfaces with different slopes, that is, the corresponding parts of the lower surface and the upper surface of the bottom wall of the thickening tank have the same slope, which can ensure the uniform thickness of the bottom wall of the thickening tank, avoid the influence of uneven thickness of the bottom wall of the thickening tank on the sewage treatment quality of the thickening tank, and also avoid imposing a burden on the bottom wall support structure. By determining the height of the outer ring and the inner ring of the first annular surface, determining the height of the outer ring and the inner ring of the second annular surface, and determining the height of the outer ring and the inner ring of the third annular surface, the slopes (tilt angles) of the first annular surface, the second annular surface, and the third annular surface can be accurately determined to ensure that the lower surface of the bottom wall of the thickening tank has a matching slope with the corresponding position of the upper surface of the bottom wall, and the accuracy of the formed thickening tank is higher.

[0013] In some embodiments of the present application, the fixed casting formwork further includes: fixing the bottom wall casting formwork of the thickener to the upper ends of a plurality of circumferential support column formworks; the plurality of circumferential support column formworks include a plurality of first support column formworks arranged at intervals on the first circumference, a plurality of second support column formworks arranged at intervals on the second circumference, and a plurality of third support column formworks arranged at intervals on the third circumference. The plurality of first support column formworks are supported below the outer ring of the first toroidal surface, the plurality of second support column formworks are supported below the inner ring of the first toroidal surface and the outer ring of the second toroidal surface, and the plurality of third support column formworks are supported below the inner ring of the second toroidal surface and the outer ring of the third toroidal surface. The inner ring of the third toroidal surface is supported by the central support column; wherein, the first circumference, the second circumference and the third circumference are coaxially arranged; the bottom wall casting formwork of the thickener is annularly arranged outside the central support column casting formwork.

[0014] In the above technical solution, both ends in the radial direction of the first toroidal surface, both ends in the radial direction of the second toroidal surface, and both ends in the radial direction of the third toroidal surface are supported, that is, the connection positions of the toroidal surfaces with different slopes are all supported by the support structure, which can improve the structural stability of the thickener.

[0015] In some embodiments of the present application, in the step of fixing the bottom wall casting formwork of the thickener to the upper ends of a plurality of circumferential support column formworks, the upper ends of the plurality of circumferential support column formworks are set as inclined portions that match the lower surface of the bottom wall casting formwork of the thickener.

[0016] In the above technical solution, the upper end of each circumferential support column formwork is set as an inclined portion that matches the lower surface of the bottom wall casting formwork of the thickener, so that the upper end of the cast circumferential support column fits more closely with the lower surface of the bottom wall of the thickener, which can improve the leak-proof performance of the thickener.

[0017] In some embodiments of the present application, the plurality of first support column formworks are connected into an integral structure by the first ring beam stirrups. The first ring beam stirrups are arranged at the upper ends of the plurality of first support column formworks, and the upper surface of the first ring beam stirrups is a first inclined portion that matches the first toroidal bottom surface; the plurality of second support column formworks are connected into an integral structure by the second ring beam stirrups. The second ring beam stirrups are arranged at the upper ends of the plurality of second support column formworks, and the upper surface of the second ring beam stirrups includes a second inclined portion that matches the first toroidal bottom surface and a third inclined portion that matches the second toroidal bottom surface; the plurality of third support column formworks are connected into an integral structure by the third ring beam stirrups. The third ring beam stirrups are arranged at the upper ends of the plurality of third support column formworks, and the upper surface of the third ring beam stirrups includes a fourth inclined portion that matches the second toroidal bottom surface and a fifth inclined portion that matches the third toroidal bottom surface.

[0018] In the above technical solution, all the support column templates on each circumference are connected into an integral structure by a ring beam stirrup, which can make the support of each support column for the thickener more stable, and the support capacity of each support column on the same circumference is strengthened by the presence of the ring beam stirrup.

[0019] In some embodiments of the present application, each of the six sector-shaped casting templates includes a first sub-sector template, a second sub-sector template, and a third sub-sector template; the six first sub-sector templates are used to cast and form a first annular surface, the six second sub-sector templates are used to cast and form a second annular surface, and the six third sub-sector templates are used to cast and form a third annular surface.

[0020] In the above technical solution, each sector-shaped casting template includes three sub-sector templates, and the casting area is divided into smaller parts, further improving the quality of the bottom wall casting of the thickener.

[0021] In some embodiments of the present application, pouring concrete into each casting template includes: sequentially pouring a plurality of circumferential support columns, a central support column, the bottom wall of the thickener, and the side wall of the thickener.

[0022] In the above technical solution, pouring the circumferential support columns and the central support column before pouring the bottom wall and the side wall of the thickener can improve the stability of the base of the thickener before pouring.

[0023] In some embodiments of the present application, pouring the bottom wall of the thickener includes: sequentially casting and forming the third annular surface, the second annular surface, and the first annular surface.

[0024] In the above technical solution, the bottom wall of the thickener is poured sequentially from the part with a large slope to the part with a small slope, which conforms to the inclination of the bottom wall, making the leak-proof performance of the bottom wall of the thickener higher.

[0025] In some embodiments of the present application, the central support column includes a first column section and a second column section connected to each other, and the first column section is located below the second column section; the central support column includes: pouring the first column section so that the height of the first column section is lower than the lower surface of the bottom wall of the thickener; pouring the second column section at the upper end of the first column section so that the second column section extends above the upper surface of the bottom wall of the thickener.

[0026] In the above technical solution, the central support column is divided into two sections for pouring, and the height of the first column section poured first is lower than the lower surface of the bottom wall of the thickener, which can make up for the shrinkage of the first column section due to solidification when pouring the second column section, so that the central support column and the bottom wall of the thickener can be closely matched.

[0027] In some embodiments of the present application, after fixing the central support column casting formwork on the peripheral wall of the central scaffolding, a radial support member is fixed on the side scaffolding, and the radial support member supports the central support column casting formwork from all around the central support column casting formwork.

[0028] In the above technical solution, the radial support of the radial support member can further improve the stability of the central support column casting formwork and increase the radial bearing capacity of the central support column casting formwork. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other relevant drawings can also be obtained based on these drawings.

[0030] Figure 1 It is a top view after the scaffolding is erected;

[0031] Figure 2 It is a top view with the casting formwork fixed on the scaffolding;

[0032] Figure 3 It is a vertical cross-sectional view with the casting formwork fixed on the scaffolding;

[0033] Figure 4 It is a top view with the bottom wall formwork of the thickener fixed on the scaffolding;

[0034] Figure 5 It is a structural schematic diagram of the formed thickener.

[0035] Icons: 10 - Central position; 11 - Reserved inserted bars; 20 - Side scaffolding; 21 - Support rods; 22 - Long crossbars; 23 - Short crossbars; 30 - Central scaffolding; 31 - Formwork for pouring central support column; 32 - Central support column; 40 - Formwork for pouring circumferential support column; 41 - First circumference; 411 - First support column formwork; 4111 - First inclined part; 412 - First support column; 42 - Second circumference; 421 - Second support column formwork; 4211 - Second inclined part; 4212 - Third inclined part; 422 - Second support column; 43 - Third circumference; 431 - Third support column formwork; 4311 - Fourth inclined part; 4312 - Fifth inclined part; 432 - Third support column; 50 - Formwork for pouring bottom wall of thickener; 51 - Bottom wall of thickener; 511 - First toroidal surface; 512 - Second toroidal surface; 513 - Third toroidal surface; 514 - First toroidal bottom surface; 515 - Second toroidal bottom surface; 516 - Third toroidal bottom surface; 517 - First sub-sector formwork; 518 - Second sub-sector formwork; 519 - Third sub-sector formwork; 60 - Formwork for pouring side wall of thickener; 61 - Side wall of thickener. Detailed implementation manners

[0036] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Usually, the components of the embodiments of the present application described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application claimed, but merely represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts fall within the scope of protection of the present application.

[0038] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0039] It should be noted that like reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0040] In the description of the embodiments of the present application, it should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art, or the orientation or positional relationship in which the product of this application is usually placed during use. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present application. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0041] Embodiment

[0042] The embodiment of the present application provides a construction method for a towering thickener, including sequentially operating measurement and setting out, scaffolding erection, fixing pouring forms, and pouring concrete into each pouring form.

[0043] Measurement and setting out includes determining the central position 10 of the thickener on the horizontal plane and determining the height positions of the upper surface and the lower surface of the bottom wall of the thickener in the vertical direction.

[0044] As Figure 1 shown, after the central position 10 of the thickener on the horizontal plane is determined, a reserved inserted bar 11 is inserted at the determined central position 10 to mark the central position 10. After the reserved inserted bar 11 is inserted, a multi-layer side scaffolding 20 is erected circumferentially around the central position 10. It should be noted that the side scaffolding 20 is composed of multiple vertically arranged support rods 21 and multiple cross bars connected to each other on the horizontal plane. Between adjacent cross bars, and between the cross bar and the vertical bar, they are fixed by steel bar binding. Since the cross bar is a rigid rod, when two adjacent long cross bars 22 are directly connected on the circumference, a relatively large included angle will appear between the two long cross bars 22, which is not conducive to the side scaffolding 20 of each layer being circular. Therefore, a short cross bar 23 is used for transitional connection between two adjacent long cross bars 22, which can make the cross bars of the same circumferential layer approach a circle as much as possible after being connected. The erection of the side scaffolding 20 mainly provides support for fixing the circumferential support column pouring form 40 later. Similarly, a central scaffolding 30 is erected within a certain radius range around the central position 10. The central scaffolding 30 mainly provides support for the central support column pouring form 31 later. The central scaffolding 30 can be erected first with the central position 10, and then the side scaffolding 20 is erected around the central scaffolding 30 after the central scaffolding 30 is erected, or the side scaffolding 20 is erected first with the central position 10, and then the central scaffolding 30 is erected at the central position 10 after the side scaffolding 20 is erected. In this embodiment, the latter is adopted.

[0045] After the central scaffolding 30 and the side scaffolding 20 are erected, the top scaffolding is erected according to the vertical height position of the bottom wall of the thickener required in actuality. The top scaffolding is fixed to the side scaffolding 20 and the central scaffolding 30. The top scaffolding is mainly for fixing the formwork 50 for pouring the bottom wall of the thickener later. By determining the center of the thickener on the horizontal plane and the height position in the vertical direction, then erecting the side scaffolding 20 around according to the center position 10 of the thickener, and then erecting the top scaffolding according to the vertical height position of the lower surface of the bottom wall of the thickener, and fixing the top scaffolding on the side scaffolding 20, in this way, a relatively accurate spatial position of the thickener can be obtained, which is convenient for centering the thickener and erecting the overall framework. Scale lines are provided on the vertical support rods 21 of the central scaffolding 30 and the side scaffolding 20 to facilitate the determination of the vertical height dimension.

[0046] As Figure 1 , Figure 2 shown, after the central scaffolding 30, the side scaffolding 20 and the top scaffolding are erected, it is necessary to fix the formwork for pouring on the central scaffolding 30 and the side scaffolding 20. The formwork for fixing the pouring includes fixing a plurality of circumferential support column formworks 40 for pouring on the side scaffolding 20, fixing the central support column formwork 31 on the circumferential wall of the central scaffolding 30, fixing the bottom wall formwork 50 for pouring the thickener and the side wall formwork 60 for pouring the thickener on the top scaffolding. A plurality of circumferential support column formworks 40 for pouring are located below the bottom wall formwork 50 for pouring the thickener. And the bottom wall formwork 50 for pouring the thickener is fixed to the upper ends of all the circumferential support column formworks 40 for pouring.

[0047] After fixing the central support column formwork 31 on the circumferential wall of the central scaffolding 30, radial supports are fixed on the side scaffolding 20. The radial supports support the central support column formwork 31 from all around the central support column formwork 31. The radial support of the radial supports can further improve the stability of the central support column formwork 31 and increase the radial bearing capacity of the central support column formwork 31.

[0048] As Figure 1 , 2 shown, the circumferential support column formwork 40 for pouring includes a plurality of first support column formworks 411 arranged at intervals on the first circumference 41, a plurality of second support column formworks 421 arranged at intervals on the second circumference 42, and a plurality of third support column formworks 431 arranged at intervals on the third circumference 43. Each first support column formwork 411, each second support column formwork 421 and each third support column formwork 431 are located below the bottom wall formwork 50 for pouring the thickener. Among them, the first circumference 41, the second circumference 42 and the third circumference 43 are coaxially arranged; the bottom wall formwork 50 for pouring the thickener is arranged around the outside of the central support column formwork 31.

[0049] In this embodiment, the formwork 31 for the central support column needs to be reinforced: The formwork 31 for the central support column is assembled with 35-mm-thick slats, lined with three-ply boards, and the upper and lower ends are fixed with the whole clear water formwork by cutting inner and outer rings with an inner diameter of 1376 mm and an outer diameter of 1976 mm. In the middle, it is bundled and welded with 2 φ10-mm steel bars at a spacing of 450 mm, and the formwork is propped up with horizontal steel pipes around the circle. The bottom of the formwork 31 for the central support column is provided with positioning bars around the circle for fixing the wooden ring.

[0050] In this embodiment, a plurality of first support column formworks 411 are connected into an integral structure by first ring beam stirrups, and the first ring beam stirrups are arranged at the upper ends of the plurality of first support column formworks 411; a plurality of second support column formworks 421 are connected into an integral structure by second ring beam stirrups, and the second ring beam stirrups are arranged at the upper ends of the plurality of second support column formworks 421; a plurality of third support column formworks 431 are connected into an integral structure by third ring beam stirrups, and the third ring beam stirrups are arranged at the upper ends of the plurality of third support column formworks 431. All the support column formworks on each circumference are connected into an integral structure by a ring beam stirrup, which can make the support of each support column for the thickener more stable, and the support capacity of each support column on the same circumference is strengthened by the presence of the ring beam stirrup.

[0051] In this embodiment, as Figures 3 to 5 shown, the upper surface of the bottom wall of the thickener includes a first annular surface 511 with a first slope, a second annular surface 512 with a second slope, and a third annular surface 513 with a third slope. The first slope is less than the second slope, the second slope is less than the third slope, and the first annular surface 511, the second annular surface 512, and the third annular surface 513 are connected in sequence; determining the height of the upper surface of the bottom wall of the thickener includes: the height of the outer ring of the first annular surface 511 and the height of the inner ring of the first annular surface 511; determining the height of the outer ring of the second annular surface 512 and the height of the inner ring of the second annular surface 512; determining the height of the outer ring of the third annular surface 513 and the height of the inner ring of the third annular surface 513.

[0052] In order to make the bottom wall of the formed thickener more uniform, the lower surface of the bottom wall of the thickener also includes a first annular bottom surface 514 with a first slope, a second annular bottom surface 515 with a second slope, and a third annular bottom surface 516 with a third slope. The first annular bottom surface 514, the second annular bottom surface 515, and the third annular bottom surface 516 are connected in sequence; determining the height of the lower surface of the thickener includes: determining the height of the outer ring of the first annular bottom surface 514 and the height of the inner ring of the first annular bottom surface 514; determining the height of the outer ring of the second annular bottom surface 515 and the height of the inner ring of the second annular bottom surface 515; determining the height of the outer ring of the third annular bottom surface 516 and the height of the inner ring of the third annular bottom surface 516.

[0053] The bottom wall of the thickener has three slopes that increase successively from the thickener along the direction close to the center of the thickener. Such a thickener facilitates sewage treatment. By determining the heights of the outer and inner rings of the first toroidal surface 511, the heights of the outer and inner rings of the second toroidal surface 512, and the heights of the outer and inner rings of the third toroidal surface 513, the slopes (tilt angles) of the first toroidal surface 511, the second toroidal surface 512, and the third toroidal surface 513 can be accurately determined, and the accuracy of the formed thickener is higher. The lower surface of the bottom wall of the thickener also includes three ring bottom surfaces with different slopes, that is, the part of the lower surface of the bottom wall of the thickener corresponding to the upper surface has the same slope, which can ensure the uniform thickness of the bottom wall of the thickener, avoid the uneven thickness of the bottom wall 51 of the thickener affecting the sewage treatment quality of the thickener, and also avoid burdening the bottom wall support structure. By determining the heights of the outer and inner rings of the first toroidal surface 511, the heights of the outer and inner rings of the second toroidal surface 512, and the heights of the outer and inner rings of the third toroidal surface 513, the slopes (tilt angles) of the first toroidal surface 511, the second toroidal surface 512, and the third toroidal surface 513 can be accurately determined to ensure that the lower surface of the bottom wall of the thickener has a matching slope with the corresponding position of the upper surface of the bottom wall, and the accuracy of the formed thickener is higher.

[0054] In this embodiment, the slopes of the third toroidal surface 513 and the third ring bottom surface 516 of the bottom wall 51 of the thickener are 45°. The 45° bottom wall pouring formwork needs to be strengthened: the wire drawing system of the 45° bottom wall pouring formwork is strengthened. The inner formwork ribs are densely paved with 35×65mm square timbers, the outer formwork ribs are made of φ25 steel bars, the formwork is assembled with 12mm thick fair-faced wood formwork strips, and point-to-point tensioning is carried out using water-stop tie rods.

[0055] All the first support column formworks 411 are supported below the outer ring of the first toroidal surface 511 (below the outer ring of the first ring bottom surface 514), all the second support column formworks 421 are supported below the inner ring of the first toroidal surface 511 (below the inner ring of the first ring bottom surface 514) and the outer ring of the second toroidal surface 512 (below the outer ring of the second ring bottom surface 515), all the third support column formworks 431 are supported below the inner ring of the second toroidal surface 512 (below the inner ring of the second ring bottom surface 515) and the outer ring of the third toroidal surface 513 (below the outer ring of the third ring bottom surface 516). The inner ring of the third toroidal surface 513 (the inner ring of the third ring bottom surface 516) is supported by the central support column 32. Both radial ends of the first toroidal surface 511 and the first ring bottom surface 514, both radial ends of the second toroidal surface 512 and the second ring bottom surface 515, and both radial ends of the third toroidal surface 513 and the third ring bottom surface 516 are supported, that is, the connecting positions of the toroidal surfaces with different slopes are all supported by support structures, which can improve the structural stability of the thickener.

[0056] In order to make the slopes of all parts of the bottom wall 51 of the thickening tank more precisely set, when erecting the top scaffolding, the top scaffolding can be adjustably set on the struts 21 of the side scaffolding 20 by means of short steel pipe socket heads, adjustable props, etc., so as to realize the adjustable height position of the top scaffolding, thereby ensuring that the height position of the bottom wall 51 of the thickening tank can be adjusted to the most reasonable one.

[0057] In order to ensure that each support formwork fits more closely with the bottom wall casting formwork 50 of the thickening tank, in the step of fixing the bottom wall casting formwork 50 of the thickening tank to the upper ends of a plurality of circumferential support column casting formworks 40, the upper ends of the plurality of circumferential support column casting formworks 40 are set as inclined parts that fit with the lower surface of the bottom wall casting formwork 50 of the thickening tank. The upper end of each circumferential support column casting formwork 40 is set as an inclined part that fits with the lower surface of the bottom wall casting formwork 50 of the thickening tank, so that the upper end of the cast circumferential support column fits more closely with the lower surface of the bottom wall of the thickening tank, and the leak-proof performance of the thickening tank can be improved.

[0058] In this embodiment, the upper surface of the first ring beam stirrup is a first inclined part 4111 that fits with the first ring bottom surface 514, the upper surface of the second ring beam stirrup includes a second inclined part 4211 that fits with the first ring bottom surface 514 and a third inclined part 4212 that fits with the second ring bottom surface 515, and the upper surface of the third ring beam stirrup includes a fourth inclined part 4311 that fits with the second ring bottom surface 515 and a fifth inclined part 4312 that fits with the third ring bottom surface 516. Among them, the inclination angles of the first inclined part 4111 and the second inclined part 4211 are both the same as the first slope (including the magnitude and inclination direction of the inclination angle), the inclination angles of the third inclined part 4212 and the fourth inclined part 4311 are both the same as the second slope (including the magnitude and inclination direction of the inclination angle), and the inclination angle of the fifth inclined part 4312 is the same as the third slope (including the inclination angle and inclination direction).

[0059] Since the bottom wall 51 of the thickening tank has a slope, special attention should be paid to the cutting length of each stirrup. The height of the ring beam stirrup should be the height in the middle of the beam, that is, the average value of the highest position and the lowest position of the inclined part, so as to accurately cut each ring beam stirrup; if the height of the ring beam stirrup is calculated based on the low position, the cross-sectional dimension of the ring beam stirrup will be too large, and vice versa, the cross-sectional dimension of the ring beam stirrup will be too small.

[0060] For the formwork on both the inner and outer horizontal members of the outermost ring beam (the first ring beam stirrup), square timbers are used. Due to the curvature, some square timbers cannot closely adhere to the formwork, but this does not affect the concrete pouring and the cross-sectional dimensions of the beam. The beam bottom is braced with tie rods. For the formwork of the inner ring beams (the second and third ring beam stirrups), due to the curvature, it is difficult to install the secondary horizontal members. Only one horizontal secondary member needs to be installed at the bottom and top of the beam side formwork respectively. The beam bottom is fastened to the secondary member with step clamps. One end of the strut is tightly pressed against the middle of the ring beam side formwork, and the other end is tightly pressed against the main node of the nearby support rod 21.

[0061] Further, the formwork 50 for pouring the bottom wall of the thickener fixed on the top scaffolding includes: fixing six sector-shaped formworks on the top scaffolding, and the central angle of each sector-shaped formwork is 60°. The formwork 50 for pouring the bottom wall of the thickener is divided into six sector-shaped pouring modules with a central angle of 60°, which can pour the bottom wall of the thickener in areas, improve the pouring quality of the bottom wall 51 of the thickener, and facilitate the formation of a high-quality bottom wall 51 of the thickener.

[0062] Among them, each of the six sector-shaped formworks includes a first sub-sector formwork 517, a second sub-sector formwork 518, and a third sub-sector formwork 519; the six first sub-sector formworks 517 are used for pouring and forming the first ring surface 511, the six second sub-sector formworks 518 are used for pouring and forming the second ring surface 512, and the six third sub-sector formworks 519 are used for pouring and forming the third ring surface 513. Each sector-shaped formwork includes three sub-sector formworks, and the pouring area is divided into smaller parts, further improving the pouring quality of the bottom wall of the thickener.

[0063] After the formwork is fixed, concrete is poured into each formwork, and multiple circumferential support columns, the central support column 32, the bottom wall 51 of the thickener, and the side wall 61 of the thickener are poured in sequence. Pouring the circumferential support columns and the central support column 32 before pouring the bottom wall 51 of the thickener and the side wall 61 of the thickener can provide a stable base for the thickener before pouring.

[0064] The concrete used for the thickener is C40 / P8 concrete, the slump of the concrete is controlled at about 140 mm, and an anti-cracking waterproof agent is added internally. After pouring, it is cured by covering with a film for 14 days. The vibrating equipment includes four sets of conventional 50-mm vibrating rods and two sets of power trowels.

[0065] In the step of pouring the bottom wall 51 of the thickener, the third toroidal surface 513, the second toroidal surface 512 and the first toroidal surface 511 are poured and formed in sequence. That is, the bottom wall of the thickener is poured from the part with a large slope to the part with a small slope, which not only conforms to the inclination of the bottom wall, but also enables the bottom wall of the thickener to have better leak-proof performance. The concrete of the bottom wall 51 of the thickener should be compacted and leveled with a flat electric trowel, which can effectively improve the crack resistance strength of the concrete of the bottom wall 51 of the thickener. There is a diversion channel on the side wall 61 of the thickener (used to drain the excess water in the thickener) and the wall is thin. After pouring in a circle to the bottom plate of the diversion channel, then pour the pool wall of the diversion channel, and finally pour the upper pool wall and the walkway plate.

[0066] It should be noted that at the joints of the various slope surfaces of the bottom wall 51 of the thickener, other sealing and filling materials can be used for strengthening treatment to prevent leakage at the joints.

[0067] Furthermore, the central support column 32 includes a first column section and a second column section connected to each other, and the first column section is located below the second column section; the central support column 32 includes: pouring the first column section so that the height of the first column section is lower than the height of the lower surface of the bottom wall of the thickener; pouring the second column section at the upper end of the first column section so that the second column section extends above the upper surface of the bottom wall 51 of the thickener. Dividing the central support column 32 into two sections for pouring, and the height of the first column section poured first is lower than the lower surface of the bottom wall of the thickener, which will enable the shrinkage caused by the solidification of the first column section to be compensated when pouring the second column section, so that the central support column 32 and the bottom wall 51 of the thickener can be closely matched.

[0068] That is, in the step of pouring concrete into each formwork, all the circumferential support columns (all the first support columns 412, all the second support columns 422, and all the third support columns 432) are poured for the first time, so that the concrete is tightly held against the side scaffolding 20 to enhance the overall stiffness, strength, and stability of the framework. The pouring height is 100 mm below the hoop of each ring beam. The central support column 32 is poured for the second time after the formwork installation of the bottom wall 51 of the thickener is completed to enhance the stability of the framework at the core position, and the pouring height is 2400 mm. The bottom wall 51 of the thickener is poured for the third time and the fourth time. Because there are too many attachments on the side wall 61 of the thickener, such as cantilevered diversion channels and cantilevered slabs, if the side wall 61 and the bottom wall 51 of the thickener are poured integrally, the construction quality cannot be guaranteed. Therefore, only the bottom wall 51 of the thickener is poured first, and then the side wall 61 of the thickener is poured. The construction joint between the bottom wall 51 and the side wall 61 of the thickener is treated with a rabbet joint, and an expansion waterstop rubber strip is pasted to ensure the reliability of the joint. The most difficult parts to pour are the bottom wall 51 and the side wall 61 of the thickener. The bottom wall 51 of the thickener is a cone with three different slopes. Before pouring the concrete, steel bar heads are welded to the lower surface formwork blocks and the upper surface wooden blocks of the bottom wall, and the concrete surface elevation of the corresponding positions is marked, and the slope is controlled by pulling a line. The specific pouring method of the bottom wall 51 of the thickener is described in the previous text and will not be elaborated here.

[0069] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. Construction method of a towering thickening tank, characterized in that, it includes: Surveying and setting out, which includes determining the central position of the thickening tank on the horizontal plane and determining the height positions of the upper and lower surfaces of the bottom wall of the thickening tank in the vertical direction; Scaffolding erection, which includes erecting a central scaffolding according to the central position of the thickening tank on the horizontal plane, circumferentially erecting a side scaffolding with the central position of the thickening tank on the horizontal plane as the center, and then erecting a top scaffolding according to the height position of the lower surface of the bottom wall of the thickening tank in the vertical direction, and fixing the top scaffolding to the side scaffolding; Fixing the pouring formwork, which includes fixing a plurality of circumferential support column pouring formworks on the side scaffolding, fixing a central support column pouring formwork on the circumferential wall of the central scaffolding, and fixing a thickening tank bottom wall pouring formwork and a thickening tank side wall pouring formwork on the top scaffolding, and the plurality of circumferential support column pouring formworks are located below the thickening tank bottom wall pouring formwork; and Pouring concrete into each pouring formwork; Fixing the thickening tank bottom wall pouring formwork on the top scaffolding includes: fixing six sector-shaped pouring formworks on the top scaffolding, and the central angle of each sector-shaped pouring formwork is 60°; The upper surface of the bottom wall of the thickening tank includes a first annular surface with a first slope, a second annular surface with a second slope, and a third annular surface with a third slope, the first slope is less than the second slope, the second slope is less than the third slope, and the first annular surface, the second annular surface and the third annular surface are connected in sequence; Determining the height of the upper surface of the bottom wall of the thickening tank includes: Determining the height of the outer ring of the first annular surface and the height of the inner ring of the first annular surface; Determining the height of the outer ring of the second annular surface and the height of the inner ring of the second annular surface; Determining the height of the outer ring of the third annular surface and the height of the inner ring of the third annular surface; The fixing of the pouring formwork further includes: Fixing the thickening tank bottom wall pouring formwork to the upper ends of the plurality of circumferential support column pouring formworks; The plurality of circumferential support column pouring formworks include a plurality of first support column formworks arranged at intervals on the first circumference, a plurality of second support column formworks arranged at intervals on the second circumference, and a plurality of third support column formworks arranged at intervals on the third circumference. The plurality of first support column formworks support below the outer ring of the first annular surface, the plurality of second support column formworks support below the inner ring of the first annular surface and the outer ring of the second annular surface, the plurality of third support column formworks support below the inner ring of the second annular surface and the outer ring of the third annular surface, and the inner ring of the third annular surface is supported by a central support column; wherein, the first circumference, the second circumference and the third circumference are coaxially arranged; The thickening tank bottom wall pouring formwork is circumferentially arranged outside the central support column pouring formwork.

2. The construction method of the towering thickening tank according to claim 1, characterized in that, The lower surface of the bottom wall of the thickening tank includes a first annular bottom surface with the first slope, a second annular bottom surface with the second slope, and a third annular bottom surface with the third slope, and the first annular bottom surface, the second annular bottom surface and the third annular bottom surface are connected in sequence; Determining the height of the lower surface of the bottom wall of the thickening tank includes: Determine the height of the outer ring of the bottom surface of the first ring and the height of the inner ring of the bottom surface of the first ring; Determine the height of the outer ring of the bottom surface of the second ring and the height of the inner ring of the bottom surface of the second ring; Determine the height of the outer ring of the bottom surface of the third ring and the height of the inner ring of the bottom surface of the third ring.

3. The construction method of the towering thickener according to claim 1, characterized in that, In the step of fixing the formwork for pouring the bottom wall of the thickener to the upper ends of the formworks for pouring the plurality of circumferential support columns, the upper ends of the formworks for pouring the plurality of circumferential support columns are set as inclined portions that cooperate with the lower surface of the formwork for pouring the bottom wall of the thickener.

4. The construction method of the towering thickener according to claim 3, characterized in that, The plurality of first support column formworks are connected into an integral structure by the first ring beam stirrups, the first ring beam stirrups are arranged at the upper ends of the plurality of first support column formworks, and the upper surface of the first ring beam stirrups is a first inclined portion that cooperates with the bottom surface of the first ring; The plurality of second support column formworks are connected into an integral structure by the second ring beam stirrups, the second ring beam stirrups are arranged at the upper ends of the plurality of second support column formworks, and the upper surface of the second ring beam stirrups includes a second inclined portion that cooperates with the bottom surface of the first ring and a third inclined portion that cooperates with the bottom surface of the second ring; The plurality of third support column formworks are connected into an integral structure by the third ring beam stirrups, the third ring beam stirrups are arranged at the upper ends of the plurality of third support column formworks, and the upper surface of the third ring beam stirrups includes a fourth inclined portion that cooperates with the bottom surface of the second ring and a fifth inclined portion that cooperates with the bottom surface of the third ring.

5. The construction method of the towering thickener according to claim 1, characterized in that, Each of the six sector formworks for pouring includes a first sub-sector formwork, a second sub-sector formwork and a third sub-sector formwork; The six first sub-sector formworks are used for pouring and forming the first ring surface, the six second sub-sector formworks are used for pouring and forming the second ring surface, and the six third sub-sector formworks are used for pouring and forming the third ring surface.

6. The construction method of the towering thickener according to claim 1, characterized in that, Pouring concrete into each formwork for pouring includes: Sequentially pouring a plurality of circumferential support columns, a central support column, the bottom wall of the thickener, and the side wall of the thickener.

7. The construction method of the towering thickener according to claim 6, characterized in that, Pouring the bottom wall of the thickener includes: Sequentially pouring and forming the third ring surface, the second ring surface and the first ring surface.

8. The construction method of the towering thickener according to claim 6, characterized in that, The central support column includes a first column section and a second column section connected to each other, and the first column section is located below the second column section; Pouring the central support column includes: Pouring the first column section so that the height of the first column section is lower than the height of the lower surface of the bottom wall of the thickener; Pouring the second column section at the upper end of the first column section so that the second column section extends above the upper surface of the bottom wall of the thickener.

9. The construction method of the towering thickener according to claim 1, characterized in that, After fixing the formwork for pouring the central support column on the peripheral wall of the central scaffolding, a radial support member is fixed on the side scaffolding, and the radial support member props up the formwork for pouring the central support column from all around the formwork for pouring the central support column.

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