Natural draft cooling tower interval precast concrete ring beam and combined inclined strut structure

Abstract

The invention provides a natural ventilation cooling tower interval precast concrete ring beam and combined inclined strut structure. The structure comprises prefabricated ring beam modules, cast-in-place ring beam sections and combined inclined struts. The combined inclined struts are of an integral prefabricated structure formed by combining a column top connecting plate and two herringbone inclined struts and are uniformly arranged along the circumference of the cooling tower, and the bottom ends of the inclined struts are connected with bearing platforms uniformly distributed on a ring foundation; the prefabricated ring beam module is of an inverted-boss-shaped prefabricated structure, the bottom faces of the two sides of the prefabricated ring beam module are supported on the edges of the two corresponding connecting plates in a lap joint mode, and an inverted boss on the lower portion of the prefabricated ring beam module is embedded into a gap between the two connecting plates. The prefabricated ring beam modules and the cast-in-place ring beam sections are arranged at intervals and connected in the circumferential direction to form an integral ring beam structure, and the prefabricated ring beam modules are higher than the cast-in-place ring beam sections. The construction of the spaced precast concrete ring beam and the combined inclined strut structure does not need to erect a support frame, so that the construction difficulty is greatly reduced, the construction cost is saved, the construction safety risk is reduced, and the construction period is shortened.

Description

[0001] manual Technical Field

[0002] The invention belongs to the technical field of industrial natural ventilation cooling towers, and in particular relates to a natural ventilation cooling tower interval precast concrete ring beam and a combined inclined support structure. Background Art

[0003] At present, most of the cooling towers in power plants are hyperbolic cooling towers, and the structure includes ring beam, cylinder wall, rigid ring at the top of the tower, inclined pillars, caps and annular foundation, etc. The ring beam is located at the lower end of the cylinder wall, and the upper and lower ends of the inclined pillars are connected to the ring beam and the caps respectively, and the caps are evenly distributed on the annular foundation.

[0004] Most of the existing large-scale natural ventilation cooling towers are reinforced concrete structures. The ring foundation and pedestal, ring beam and the cylinder wall structure above the ring beam are all cast-in-place structures, and the inclined support structure has two forms: cast-in-place concrete or precast concrete.

[0005] In the construction of reinforced concrete cooling towers, the construction of the ring beam requires the erection of a support frame for the bottom formwork of the ring beam. If the inclined support is a precast concrete structure, the support frame for the bottom formwork of the ring beam will be erected after the inclined support is hoisted; for the inclined support of the cast-in-place concrete structure, it is even more necessary to erect the inclined support formwork support frame during the construction of the inclined support. After the construction of the inclined support is completed, the formwork support frame of the inclined support will be expanded and reinforced, and a complete and closed support frame for supporting the bottom formwork of the ring beam will be formed in the circumferential direction of the entire cooling tower.

[0006] Therefore, the existing construction of the ring beam and cast-in-place diagonal pillars of large-scale natural ventilation cooling towers with reinforced concrete structures requires a lot of manpower, material resources, and time to set up formwork support frames. The number of steel pipes used to set up the ring beam and diagonal pillar formwork support frames is as high as thousands of tons, and the erection cycle, service cycle, and later dismantling of the support frames are as long as several months. During this period, the materials cannot be turned over, and the labor and material costs are extremely high; because the construction of cast-in-place ring beams and cast-in-place diagonal pillars requires the erection of large-scale formwork support frames and the laying of formworks, the construction cycle is long, which has a very obvious impact on the construction period of the cooling tower; there are a lot of high-altitude operations in the erection and dismantling of the formwork support frames, which poses a great safety risk.

[0007] In view of the high cost, great safety risk and long construction period of the existing cast-in-place ring beams and inclined columns of cooling towers, it is necessary to propose a new inclined column and ring beam structure that can not only meet the use and safety function requirements of the inclined column and ring beam structure of cooling towers, but also significantly reduce construction costs, reduce construction safety risks and shorten construction period. Summary of the invention

[0008] The present invention provides a natural ventilation cooling tower precast concrete ring beam and combined inclined support structure. The structure can greatly reduce the construction difficulty, save construction costs, reduce construction safety risks, and shorten the construction period, while meeting the performance requirements of the cooling tower inclined support and ring beam structure and the safety function of use. To achieve the above purpose, the present invention adopts the following technical solutions:

[0009] A prefabricated concrete ring beam and combined oblique support structure for a natural ventilation cooling tower comprises a prefabricated ring beam module, a cast-in-place ring beam section, and a combined oblique support. The combined oblique support is a combined structure of two herringbone-shaped oblique supports and a connecting plate.

[0010] The combined inclined support, such as Figure 3 As shown, it includes a connecting plate and two oblique pillars; the upper ends of the two oblique pillars intersect, and the lower ends are separated into a herringbone shape. The connecting plate is obliquely intersected and connected with the connecting plate at or near the intersection of the two oblique pillars to form an integral structure, which is prefabricated as a whole.

[0011] A plurality of modular inclined struts are evenly arranged along the circumference of the cooling tower, and each modular inclined strut is prefabricated and then mechanically hoisted into place; the lower ends of two of the modular inclined struts are obliquely connected to two corresponding pedestals respectively; one of each two modular inclined struts is commonly connected to a pedestal; the spacing distance between the connecting plates of two adjacent modular inclined struts is slightly larger than the circumferential length of the lower inverted boss of the prefabricated ring beam module, but slightly smaller than the circumferential length of the upper main body of the prefabricated ring beam module.

[0012] Furthermore, the cross-section of the oblique struts may be circular, elliptical, rectangular, or a rectangle with the radial direction as the long side, depending on structural calculations.

[0013] Furthermore, the oblique intersection and connection position between the connecting plate and the upper ends of the two oblique pillars may be at the intersection of the oblique pillars, above the intersection or below the intersection, depending on structural calculations.

[0014] Furthermore, the thickness and circumferential length of the connecting plate are determined according to the structure of the combined inclined support column itself, the determined weight of the prefabricated ring beam module, and the force analysis calculation of the supporting prefabricated ring beam module.

[0015] Preferably, the combined inclined support column is a prefabricated concrete structure and is mechanically hoisted into place during construction.

[0016] Preferably, when the combined oblique support column is mechanically hoisted into place, auxiliary stabilizing hoisting equipment is provided through calculation to meet the overall stiffness and strength of the combined oblique support column during hoisting.

[0017] The prefabricated ring beam module, such as Figure 4As shown, the length along the circumferential direction is in the form of an inverted boss that is larger at the top and smaller at the bottom. The circumferential length of the module body is greater than the distance between two adjacent connecting plates, and the circumferential length of the lower inverted boss is less than the distance between two adjacent connecting plates. After the prefabricated ring beam module is prefabricated, it is mechanically hoisted into place. The bottom edges on both sides of the prefabricated ring beam module body are supported on the corresponding edges of the connecting plates to form a certain width of overlap, and the lower inverted boss is embedded in the gap between the two connecting plates. Multiple prefabricated ring beam modules are evenly arranged along the circumference of the cooling tower.

[0018] The cast-in-place ring beam segment, such as Figure 4 As shown, they are evenly distributed along the circumference of the cooling tower and arranged at intervals with the prefabricated ring beam modules; the lower plane of each cast-in-place ring beam segment is combined with the plane of the combined inclined support column top connecting plate; the two side surfaces perpendicular to the circumference are combined with the side surfaces of the prefabricated ring beam module.

[0019] The height of the cast-in-place ring beam section is smaller than the height of the prefabricated ring beam module. The integral ring beam formed by the interval arrangement of multiple cast-in-place ring beam sections and prefabricated ring beam modules has a concave and convex upper surface, which is embedded and connected with the lower surface of the cast-in-place wind duct constructed later, further increasing the integrity of the ring beam and satisfying the structural integrity of the cooling tower.

[0020] Furthermore, the height of the inverted boss at the lower portion of the prefabricated ring beam module is the same as the thickness of the top connecting plate of the combined inclined support column.

[0021] Furthermore, the inverted boss at the bottom of the prefabricated ring beam module is inserted between two adjacent column top connection plates to form a mutually interlocking and embedded connection form, thereby ensuring the structural integrity of the cooling tower ring beam in the circumferential direction after the overall formation. Furthermore, the bottom edges on both sides of the main body of the prefabricated ring beam module are overlapped and supported on the upper plane edges on both sides of the corresponding combined inclined support column top connection plates, overlapping each other by a certain width, and the overlap width is determined according to calculation. Furthermore, when pouring the concrete of the cast-in-place ring beam section, the upper surface of the connection plate is used as the bottom template, the opposite side surfaces of the prefabricated ring beam module are used as the templates for the two side surfaces perpendicular to the circumferential direction, and the special template for the upper wind duct construction is used as the template for the two side surfaces parallel to the circumferential direction.

[0022] Furthermore, the height of the cast-in-place ring beam section is lower than the height of the prefabricated ring beam module, and the concave and convex surface jointly formed by the cast-in-place ring beam section and the upper surface of the prefabricated ring beam module forms an embedded and interlocking effect with the bottom of the wind duct, thereby ensuring the structural integrity of the ring beam and the wind duct.

[0023] Furthermore, the connecting plates of the combined oblique struts, the prefabricated ring beam modules, the radial width of the cast-in-place ring beam sections, and the installation inclination of the oblique struts are calculated and determined based on the overall design structure of the cooling tower.

[0024] Furthermore, the steel connection between the prefabricated ring beam module and the cast-in-place ring beam segment, and the steel connection between the two and the combined inclined support connecting plate are determined according to calculations and specifications.

[0025] Compared with the existing reinforced concrete cooling tower structure, the present invention has the following advantages:

[0026] 1. The ring beam structure consists of precast concrete modules and cast-in-place concrete sections that are alternately spaced in the circumferential direction. The construction of the precast modules does not require the erection of support frames;

[0027] 2. The cast-in-place ring beam section uses the combined inclined support column top connection plate as the bottom template, the two sides perpendicular to the circumference use the sides of the prefabricated ring beam module as the template, and the two side templates parallel to the circumference directly use the special template for the upper wind tube construction. Therefore, the cast-in-place section construction does not require the erection of a support frame;

[0028] 3. The construction of interval precast concrete ring beams saves a lot of manpower and material costs caused by the erection of support frames, shortens the construction period, and avoids a lot of safety risks caused by the erection and removal of support frames;

[0029] 4. The concrete pouring of the cast-in-place ring beam section uses the upper surface of the column top connection plate of the combined inclined support as the bottom formwork, without the need to lay out a separate bottom formwork or set up a support frame, saving a large amount of bottom formwork and support frame materials.

[0030] 5. The combined inclined support column is prefabricated with two inclined supports and a column top connection plate. It can be hoisted into place during construction without the need to set up a support frame.

[0031] 6. During the construction of each combined inclined support, a temporary support is used for support after it is hoisted into place. This changes the existing practice of hoisting prefabricated inclined supports, where one inclined support is hoisted each time and each inclined support requires a separate temporary support. This shortens the construction period and greatly saves the amount of materials used for temporary support. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Schematic diagram of the existing cooling tower and a partial enlarged view of the ring beam and inclined support

[0033] Figure 2 The schematic diagram of the cooling tower of the present invention and the partial enlarged diagram of the ring beam and inclined support

[0034] Figure 3 A three-dimensional diagram of a combined inclined support column

[0035] Figure 4 Prefabricated ring beam for intervals

[0036] In the figure: 1 is a prefabricated ring beam module; 2 is a cast-in-place ring beam segment; 3 is a combined inclined support column; 301 is an inclined support column; 302 is a connecting plate; 4 is a cap; and 5 is a ring foundation. Specific implementation methods

[0038] The following combination Figure 2-Figure 4 The present invention is described in further detail.

[0039] A natural ventilation cooling tower precast concrete ring beam and combined inclined support structure comprises a plurality of precast ring beam modules 1 and a plurality of cast-in-place ring beam sections 2; the precast ring beam modules 1 and the cast-in-place ring beam sections 2 are evenly arranged and interconnected to form a fully enclosed, integral concrete ring beam structure along the circumference of the cooling tower.

[0040] The combined inclined struts 3 are evenly arranged along the circumference of the cooling tower;

[0041] The two oblique pillars in each combined oblique pillar 3 intersect at one point at the top of the pillar, and the bottom of the pillar is separated into a herringbone shape. The two oblique pillars 301 and the connecting plate 302 are prefabricated as a whole; the connecting plate 302 is obliquely intersected and connected with the oblique pillars 301, and the intersection angle is determined according to the design; the position where the connecting plate 302 intersects with the two oblique pillars is determined according to the design calculation;

[0042] The lower ends of the two inclined struts 301 in the combined inclined struts 3 are obliquely connected to the corresponding two pedestals 4, respectively. Each inclined strut 301 in every two combined inclined struts 3 is connected to a pedestal 4 together. The circumferential spacing between the connecting plates 302 of two adjacent combined inclined struts 3 is slightly larger than the circumferential length of the lower inverted boss of the prefabricated ring beam module 1, and slightly smaller than the circumferential length of the upper main body of the prefabricated ring beam module 2. The prefabricated ring beam module 1 is in the shape of an inverted boss cross section in the circumferential direction, and the bottom edges on both sides of the main body of the upper part are supported on the corresponding edges of the connecting plates 302 of the two adjacent combined inclined struts 3 below, forming a certain width of overlap with the edges of the connecting plates 302. The inverted boss of the prefabricated ring beam module 1 is inserted into the interval between the two adjacent connecting plates 302, so that the prefabricated ring beam module 1 and the combined inclined struts 3 form a mutually embedded and interlocking structural connection in the circumferential direction, satisfying the structural integrity.

[0043] The lower surface of the cast-in-place ring beam segment 2 is combined with the upper surface of the connecting plate 302, and the two side surfaces perpendicular to the circumference are respectively combined with the prefabricated ring beam modules 1 adjacent to both sides; when pouring concrete for the cast-in-place ring beam segment, the upper surface of the connecting plate 302 is used as the bottom formwork of the cast-in-place ring beam segment 2, and the prefabricated ring beam modules 1 adjacent to both sides are respectively used as the side forms of the two side surfaces of the cast-in-place ring beam segment 2 perpendicular to the circumference, and the two side surfaces parallel to the circumference are directly constructed using the special formwork of the upper wind tube;

[0044] The height of the cast-in-place ring beam segment 2 is lower than that of the prefabricated ring beam module 1. A plurality of prefabricated ring beam modules and cast-in-place ring beam segments are arranged at intervals to form an integral ring beam. The concave and convex surfaces formed together are embedded and engaged with the bottom of the wind tube to meet the structural integrity of the ring beam and the wind tube.

[0045] The above is a detailed description of the present invention, and the specific embodiments of the present invention cannot be considered to be limited thereto. For ordinary technicians in the technical field to which the present invention belongs, under the premise of the present invention, several simple deductions or substitutions can be made, and these deductions and substitutions include but are not limited to:

[0046] The combined inclined support pillar has an elliptical, diamond, or polygonal shape in addition to a circular shape;

[0047] The combined diagonal support is not a prefabricated structure, but a cast-in-place structure. Although this replacement requires the construction of a support frame for the diagonal support;

[0048] All of them should be deemed to fall within the scope of protection of the invention determined by the claims submitted for the present invention.

Claims

1. A natural ventilation cooling tower precast concrete ring beam and combined inclined support structure, characterized in that: The combined diagonal pillar is an integral precast concrete structure of two herringbone-shaped diagonal pillars and a connecting plate at the top of the pillars. Each combined diagonal pillar is hoisted as a whole and connected to the pedestals evenly distributed on the ring base. The connecting plate at the intersection of the two diagonal pillars or nearby connects the two diagonal pillars into a combined structure; the combined diagonal pillars are evenly arranged along the circumference of the cooling tower. The spaced precast concrete ring beam is composed of precast ring beam modules and cast-in-place ring beam sections that are arranged at intervals and connected to each other. The precast ring beam modules are supported on the edges of the corresponding two combined diagonal pillar connecting plates and overlapped to a certain width; the cast-in-place ring beam section uses the connecting plate, precast ring beam module, and special formwork for the wind duct as the formwork for pouring its concrete; the precast ring beam modules and cast-in-place ring beam sections are arranged at intervals and connected to each other to form an integral ring beam structure; 2. A natural ventilation cooling tower precast concrete ring beam and combined inclined support structure according to claim 1, characterized in that: The prefabricated ring beam module is a prefabricated structure in the shape of an inverted boss, the lower edges of the two sides of the main body of which are overlapped and supported on the edges of the two sides of the corresponding connecting plates, and the lower inverted boss is embedded in the interval between the two corresponding connecting plates, forming a mutually embedded structure of the interval prefabricated ring beam overall structure and the combined oblique support; the height of the prefabricated ring beam module is greater than the height of the cast-in-place ring beam section, forming a mutually embedded relationship between the circumferential overall structure of the interval prefabricated ring beam and the wind tube structure; 3. A natural ventilation cooling tower precast concrete ring beam and combined inclined support structure according to claim 1, characterized in that: The combined inclined support is an integral prefabricated structure consisting of a connecting plate and two herringbone inclined supports. The connecting plate is used to connect the two inclined supports at the intersection of their upper ends to form an integral combined structure, and the entire structure is prefabricated and hoisted.

4. A natural ventilation cooling tower precast concrete ring beam and combined inclined support structure according to claim 1, characterized in that: The spacing distance between the connecting plates of adjacent combined inclined struts corresponds to the circumferential length of the prefabricated ring beam module, which supports and circumferentially embeds the inverted boss type prefabricated ring beam module; the combined inclined struts also serve as the bottom mold of the cast-in-place ring beam section during the construction phase and the support frame for the interval prefabricated ring beam.

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