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

Abstract

The utility model 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 by the edges of the two corresponding connecting plates, and an inverted boss on the lower portion of the prefabricated ring beam module is embedded into the interval 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

Technical Field

[0001] This utility model belongs to the technical field of industrial natural ventilation cooling towers, and specifically relates to a precast concrete ring beam and combined inclined support structure for a natural ventilation cooling tower. Background Technology

[0002] Currently, most power plant cooling towers are constructed using a hyperbolic cooling tower design. The structure includes a ring beam, cylinder wall, rigid ring at the top, inclined supports, foundation, and annular base. The ring beam is located at the lower end of the cylinder wall, and the inclined supports are connected to the ring beam and foundation at their upper and lower ends, respectively. The foundation is evenly distributed on the annular base.

[0003] Most existing large natural draft cooling towers are reinforced concrete structures. The ring foundation and abutment, ring beam and the cylinder wall structure above the ring beam are all cast-in-place structures, while the inclined support structure can be either cast-in-place concrete or precast concrete.

[0004] In the construction of reinforced concrete cooling towers, the ring beam construction requires the erection of a support frame for the bottom formwork of the ring beam. If the inclined columns are precast concrete structures, the support frame for the bottom formwork of the ring beam is erected after the inclined columns are hoisted. For inclined columns made of cast-in-place concrete, the inclined column formwork support frame needs to be erected during the construction of the inclined columns. After the inclined columns are completed, the formwork support frame is expanded and reinforced to form a complete and enclosed support frame for supporting the bottom formwork of the ring beam along the entire circumference of the cooling tower.

[0005] Therefore, the construction of the ring beam and cast-in-place inclined columns of existing large-scale reinforced concrete natural ventilation cooling towers requires a significant amount of manpower, resources, and time for erecting formwork support frames. The number of steel pipes used to erect these support frames often reaches thousands of tons, and the erection, use, and dismantling of these frames can take several months. During this period, materials cannot be readily available, resulting in extremely high labor and material costs. Furthermore, the construction of cast-in-place ring beams and inclined columns involves large-scale formwork support frames and formwork installation, leading to a long construction period that significantly impacts the cooling tower's construction schedule. The erection and dismantling of these formwork support frames also involve extensive work at height, posing significant safety risks.

[0006] Given the current situation of high cost, high safety risks, and long construction period in the construction of existing cast-in-place ring beams and inclined supports for cooling towers, it is necessary to propose a new type of inclined support and ring beam structure that can meet the structural and safety requirements of cooling tower inclined supports and ring beams, while significantly reducing construction costs, construction safety risks, and shortening the construction period. Summary of the Invention

[0007] This utility model provides a precast concrete ring beam and combined inclined support structure for a natural draft cooling tower. This structure, while meeting the performance requirements and safety functions of the inclined support and ring beam structure of the cooling tower, significantly reduces construction difficulty, saves construction costs, reduces construction safety risks, and shortens the construction period. To achieve the above objectives, this utility model adopts the following technical solution:

[0008] A precast concrete ring beam and combined inclined support structure for a natural ventilation cooling tower includes a precast ring beam module, a cast-in-place ring beam segment, and a combined inclined support. The combined inclined support is a combination structure of two herringbone-shaped inclined supports and a connecting plate.

[0009] The combined inclined support, such as Figure 3 As shown, it includes a connecting plate and two inclined supports; the upper ends of the two inclined supports meet and the lower ends separate into a V-shape. The connecting plate is obliquely connected to the connecting plate at or near the intersection of the two inclined supports to form an integral structure, which is prefabricated as a whole.

[0010] Multiple modular inclined supports are evenly arranged along the circumference of the cooling tower. Each modular inclined support is prefabricated and then mechanically hoisted into place. The lower ends of two of the modular inclined supports are diagonally connected to two corresponding foundations. One of each pair of modular inclined supports is connected to a foundation. The spacing between the connecting plates of two adjacent modular inclined supports is slightly greater than the circumferential length of the inverted protrusion at the bottom of the prefabricated ring beam module, but slightly less than the circumferential length of the upper main body of the prefabricated ring beam module.

[0011] Furthermore, the cross-sectional shape of the inclined support can be circular, elliptical, rectangular, or rectangular with the radial side being the longer side, depending on the structural calculations.

[0012] Furthermore, the connection point where the connecting plate intersects the upper ends of the two inclined supports can be at the intersection point of the inclined supports, above the intersection point, or below the intersection point, depending on the structural calculations.

[0013] Furthermore, the thickness and circumferential length of the connecting plate are determined based on the structure of the combined inclined support column itself, the determined weight of the prefabricated ring beam module, and the stress analysis calculation of the supporting prefabricated ring beam module.

[0014] Preferably, the combined inclined support is a precast concrete structure, which is installed in place by mechanical hoisting during construction.

[0015] Preferably, when the combined inclined support is mechanically hoisted into place, auxiliary stabilizing hoisting equipment is added according to calculations to ensure the overall rigidity and strength of the combined inclined support during hoisting.

[0016] The prefabricated ring beam module, such as Figure 4As shown, the circumferential length is an inverted protrusion with a larger upper part and a smaller lower part. The circumferential length of the main body of the module is greater than the distance between two adjacent connecting plates, while the circumferential length of the lower inverted protrusion is less than the distance between two adjacent connecting plates. After the prefabricated ring beam module is prefabricated, it is placed in place by mechanical hoisting. The bottom edges of both sides of the main body of the prefabricated ring beam module are supported on the corresponding edges of the connecting plates, forming an overlap of a certain width. The lower inverted protrusion 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.

[0017] The cast-in-place ring beam segment, such as Figure 4 As shown, the precast ring beams are evenly distributed along the circumference of the cooling tower and spaced apart from the precast ring beam modules; the lower plane of each cast-in-place ring beam segment is connected to the upper plane of the top connecting plate of the combined inclined support column; and it is connected to the two sides perpendicular to the circumference and the sides of the precast ring beam modules.

[0018] The height of the cast-in-place ring beam segment is less than the height of the precast ring beam module. The overall ring beam, which is formed by multiple cast-in-place ring beam segments and precast ring beam modules arranged at intervals, has an uneven upper surface that is interlocked with the lower surface of the cast-in-place air duct constructed later, further increasing the integrity of the ring beam and also satisfying the structural integrity of the cooling tower.

[0019] Furthermore, the height of the inverted protrusion at the bottom of the precast ring beam module is the same as the thickness of the connecting plate at the top of the combined inclined support column.

[0020] Furthermore, the inverted protrusion at the bottom of the prefabricated ring beam module is inserted between the connecting plates of two adjacent column tops to form a mutually interlocking and embedded connection, ensuring the structural integrity of the cooling tower ring beam in the circumferential direction after the overall ring beam is formed.

[0021] Furthermore, the bottom edges of the two sides of the precast ring beam module are overlapped and supported on the upper plane edges of the corresponding combined inclined column top connecting plate, with an overlap width of a certain width, which is determined by calculation.

[0022] Furthermore, for the pouring of the cast-in-place ring beam section concrete, the upper surface of the connecting plate is used as the bottom formwork, the opposite sides of the precast ring beam module are used as the formwork for the two sides perpendicular to the circumference, and the special formwork for the upper ventilation duct construction is used as the formwork for the two sides parallel to the circumference.

[0023] Furthermore, the height of the cast-in-place ring beam section is lower than the height of the precast ring beam module. The concave and convex surfaces formed by the cast-in-place ring beam section and the upper surface of the precast ring beam module together form a locking and interlocking effect with the bottom of the air duct, ensuring the structural integrity of the ring beam and the air duct.

[0024] Furthermore, the radial width of the connecting plate of the combined inclined support column, the prefabricated ring beam module, the cast-in-place ring beam section, and the installation inclination of the inclined support column are determined according to the overall design structure calculation of the cooling tower.

[0025] Furthermore, the reinforcement connections between the precast ring beam modules and the cast-in-place ring beam segments, as well as the reinforcement connections between the two and the combined inclined support plate, are determined according to calculations and specifications.

[0026] Compared with existing reinforced concrete cooling tower structures, the advantages of this utility model are:

[0027] 1. The ring beam structure consists of precast concrete modules and cast-in-place concrete sections that are alternately spaced in a circular direction. No support frame needs to be erected during the construction of the precast modules.

[0028] 2. For the cast-in-place ring beam segment, the top connecting plate of the combined inclined support column serves as the bottom formwork. The two sides perpendicular to the circumference use the sides of the precast ring beam module as formwork, while the two sides parallel to the circumference directly utilize the special formwork used for the upper ventilation duct construction. Therefore, no support frame is required for the construction of the cast-in-place segment.

[0029] 3. The construction of precast concrete ring beams at intervals saves a lot of manpower and material costs associated with the erection of support frames, reduces the construction period, and avoids a lot of safety risks associated with the erection and dismantling of support frames;

[0030] 4. The concrete pouring of the cast-in-place ring beam section uses the top surface of the column top connecting plate of the composite inclined column as the bottom formwork, eliminating the need for additional bottom formwork and support frame, thus saving a significant amount of bottom formwork and support frame materials.

[0031] 5. The combined inclined support is a prefabricated structure consisting of two inclined supports and a connecting plate at the top of the column. It can be hoisted into place during construction without the need for a support frame.

[0032] 6. The construction of each modular inclined column involves hoisting it into place and then using a temporary support. This changes the existing practice of hoisting precast inclined columns, where one column is hoisted at a time and each column requires a separate temporary support. This shortens the construction period and greatly saves the amount of materials used for temporary supports. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of an existing cooling tower, along with enlarged views of the ring beam and inclined support columns.

[0034] Figure 2 This is a schematic diagram of the cooling tower of the present invention, and a partial enlarged view of the ring beam and inclined support.

[0035] Figure 3 3D diagram of a combined inclined support column

[0036] Figure 4 3D view of precast ring beams at intervals

[0037] In the diagram: 1 is a precast ring beam module; 2 is a cast-in-place ring beam segment; 3 is a combined inclined support; 301 is an inclined support; 302 is a connecting plate; 4 is a foundation; 5 is a ring foundation. Detailed Implementation

[0038] The following combination Figures 2-4 The present invention will be described in further detail below.

[0039] A precast concrete ring beam and combined inclined support structure for a natural ventilation cooling tower includes multiple precast ring beam modules 1 and multiple cast-in-place ring beam segments 2; the precast ring beam modules 1 and cast-in-place ring beam segments 2 are evenly spaced and connected to each other to form a fully enclosed, integral concrete ring beam structure along the circumference of the cooling tower.

[0040] The combined inclined support column 3 is evenly arranged along the circumference of the cooling tower;

[0041] In each composite inclined support 3, the two inclined supports intersect at a point at the top of the column and separate into a herringbone shape at the bottom. The two inclined supports 301 and the connecting plate 302 are prefabricated as a whole. The connecting plate 302 is inclined to the inclined support 301 and the angle of intersection is determined according to the design. The position where the connecting plate 302 intersects the two inclined supports is determined according to the design calculation.

[0042] In the combined inclined support column 3, the lower ends of the two inclined support columns 301 are respectively diagonally connected to the two corresponding bearing platforms 4. Each pair of combined inclined support columns 3 has one inclined support column 301 connected to one bearing platform 4. The circumferential distance between the connecting plates 302 of two adjacent combined inclined support columns 3 is slightly larger than the circumferential length of the inverted boss at the bottom of the precast ring beam module 1 and slightly smaller than the circumferential length of the upper main body of the precast ring beam module 2. The precast ring beam module 1 has an inverted boss cross-section in the circumferential direction. The bottom edges of the upper main body on both sides are supported on the corresponding edges of the connecting plates 302 of the two adjacent combined inclined support columns 3 below, forming an overlap of a certain width with the edges of the connecting plates 302. The inverted boss of the precast ring beam module 1 is embedded in the gap between the two adjacent connecting plates 302, so that the precast ring beam module 1 and the combined inclined support column 3 form a mutually interlocking structural connection in the circumferential direction, satisfying the integrity of the structure.

[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 sides perpendicular to the circumference are combined with the adjacent precast ring beam modules 1 on both sides respectively. When the cast-in-place ring beam segment is poured with concrete, the upper surface of the connecting plate 302 serves as the bottom formwork of the cast-in-place ring beam segment 2, and the two adjacent precast ring beam modules 1 on both sides serve as the side formwork of the cast-in-place ring beam segment 2 perpendicular to the circumference. The two sides parallel to the circumference directly utilize the special template for the construction of the upper ventilation duct.

[0044] The height of the cast-in-place ring beam segment 2 is lower than the height of the precast ring beam module 1. Multiple precast 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 by them are interlocked with the bottom of the air duct to satisfy the structural integrity of the ring beam and the air duct.

[0045] The above content is a detailed description of the present utility model. It should not be considered that the specific embodiments of the present utility model are limited to this. For those skilled in the art, under the premise of the present utility model, several simple deductions or substitutions can be made. These deductions and substitutions include, but are not limited to: the shape of the combined inclined support column is elliptical, rhomboid or polygonal other than circular.

[0046] The composite inclined support is not a precast structure, but rather a cast-in-place structure. This replacement necessitates the erection of a support frame during the construction of the inclined support;

[0047] All of these should be considered to fall within the scope of protection of the invention as defined in the claims submitted herein.

Claims

1. A precast concrete ring beam and combined inclined support structure for a natural ventilation cooling tower, characterized in that: The composite inclined support is an integral precast concrete structure consisting of two herringbone-shaped inclined supports and a connecting plate at the top. Each composite inclined support is hoisted as a whole and connected to the evenly distributed foundation on the ring base. The connecting plate at or near the intersection of the tops of the two inclined supports connects them into a composite structure. The composite inclined supports are evenly distributed along the circumference of the cooling tower. The precast concrete ring beam is composed of precast ring beam modules and cast-in-place ring beam segments arranged at intervals and connected to each other. The precast ring beam modules are supported on the edges of the connecting plates of the corresponding two composite inclined supports, with an overlap of a certain width. The cast-in-place ring beam segments use the connecting plate, the precast ring beam modules, and the special formwork for the air duct as templates for their concrete pouring. The precast ring beam modules and cast-in-place ring beam segments are arranged at intervals and connected to each other to form an integral ring beam structure.

2. The precast concrete ring beam and combined inclined support structure for a natural ventilation cooling tower according to claim 1, characterized in that: The precast ring beam module is a precast structure in the shape of an inverted protrusion. The lower edges of its main body overlap and support the corresponding edges of the connecting plates. The lower inverted protrusion is embedded in the gap between the two corresponding connecting plates, forming a mutually embedded structure of the precast ring beam and the combined inclined support column. The height of the precast 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 precast ring beam and the ventilation duct structure.

3. The precast concrete ring beam and combined inclined support structure for a natural ventilation cooling tower according to claim 1, characterized in that: The modular inclined support is a prefabricated structure consisting of a connecting plate and two herringbone-shaped inclined supports. The connecting plate connects the two inclined supports at their upper intersection to form a complete modular structure, which is then hoisted as a whole.

4. The precast concrete ring beam and combined inclined support structure for a natural ventilation cooling tower according to claim 1, characterized in that: The spacing between the connecting plates of adjacent combined inclined columns corresponds to the circumferential length of the precast ring beam module, providing support and circumferential fixation for the inverted protrusion type precast ring beam module; the combined inclined columns also serve as the bottom formwork for the cast-in-place ring beam section during the construction stage and the support frame for the spaced precast ring beams.

Images