Natural ventilation cooling tower and dumbbell-shaped concrete filled steel tube cross strut thereof

Abstract

The invention discloses a natural ventilation cooling tower and a dumbbell-shaped concrete filled steel tube cross strut thereof, the dumbbell-shaped concrete filled steel tube cross strut comprises four dumbbell-shaped steel tube limb columns and cross nodes, and the end parts of the dumbbell-shaped steel tube limb columns are connected with the cross nodes to form a cross structure; the cross joint comprises a vertical stiffening plate, an upper reinforcing ring, a lower reinforcing ring, a plurality of joint sleeves and a plurality of joint webs, the upper reinforcing ring and the lower reinforcing ring are perpendicularly crossed with the vertical stiffening plate, the joint webs are connected with the joint sleeves, and the joint sleeves, the joint webs, the upper reinforcing ring and the lower reinforcing ring form a dumbbell-shaped structure with the vertical stiffening plate as the central axis. Open holes are formed in the reinforcing rings and used for pouring and circulation of concrete, the four dumbbell-shaped steel pipe limb columns are arranged at the open holes of the upper reinforcing ring and the lower reinforcing ring, and a closed space is formed by the joint sleeve, the joint web, the upper reinforcing ring, the lower reinforcing ring and the four dumbbell-shaped steel pipe limb columns. The problem of material waste caused by rich in-plane directional bearing capacity of a circular section can be solved.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a natural ventilation cooling tower and its dumbbell-shaped steel tube concrete cross support. Background Technology

[0002] There are currently four main structural forms for the support systems of natural draft cooling towers: reinforced concrete structures, steel-concrete composite structures, steel structures, and steel-concrete composite structures. Reinforced concrete supports are the most widely used in natural draft cooling towers, while steel structure supports and steel-concrete composite supports have only been used in natural draft cooling towers in recent years.

[0003] The following problems exist with the four structural types of natural draft cooling tower support systems:

[0004] Problems and defects of reinforced concrete columns: 1. Construction requires a large amount of scaffolding for formwork; 2. Long construction period; 3. Large initial geometric defects, and the column axis deviates from the design axis after construction; 4. Large column cross-sectional dimensions, which increases the thickness of the lower ring beam at the contact point between the column and the tower, thus increasing the total amount of concrete and steel reinforcement used in the cooling tower structure.

[0005] Problems and defects of steel-concrete composite columns: 1. Construction requires the erection of a large amount of scaffolding for formwork; 2. Long construction period. Compared with reinforced concrete columns, although the column cross-sectional size is reduced, construction still requires the erection of a large amount of scaffolding.

[0006] Problems and defects of steel structure lattice columns: 1. Large steel consumption and high cost; 2. High corrosion protection cost; 3. Large column cross-sectional dimensions, increasing the footprint.

[0007] Problems and defects of circular steel tube concrete columns: 1. Waste of materials: Because the bending resistance of a circular cross section is the same in and out of the X-shaped intersection plane, while the calculated length of an X-shaped column differs by nearly double in and out of the plane, there is a waste of materials in the plane of the circular cross section.

[0008] Problems and defects of cross-pipe joints: 1. Waste of steel; 2. Limited operating space at the intersection of left and right pipes, making welding difficult and easily leading to substandard weld quality. Summary of the Invention

[0009] To address the aforementioned problems, this invention provides a natural ventilation cooling tower and its dumbbell-shaped steel-concrete cross support, which can solve the material waste caused by the excess in-plane bearing capacity of a circular cross section.

[0010] The present invention discloses a dumbbell-shaped steel tube concrete cross support, comprising four dumbbell-shaped steel tube limbs and a cross node. The ends of each dumbbell-shaped steel tube limb are connected to the cross node to form a cross structure. The cross node includes a vertical stiffening plate, an upper reinforcing ring and a lower reinforcing ring arranged perpendicularly to the vertical stiffening plate, several node sleeves, and multiple node webs connecting the node sleeves. The node sleeves, node webs, upper reinforcing rings, and lower reinforcing rings form a dumbbell-shaped structure with the vertical stiffening plate as the central axis. The reinforcing rings are provided with openings for concrete pouring and flow. The four dumbbell-shaped steel tube limbs are arranged at the openings of the upper and lower reinforcing rings. The node sleeves, node webs, upper reinforcing rings, lower reinforcing rings, and four dumbbell-shaped steel tube limbs form a closed space.

[0011] A further technical solution of the present invention is that the cross node further includes a middle reinforcing ring, which is disposed between the upper reinforcing ring and the lower reinforcing ring and contacts the node sleeve and the node web.

[0012] A further technical solution of the present invention is: the dumbbell-shaped steel pipe column includes a column web connecting adjacent columns, and the upper and lower column webs are respectively connected to both ends of the node web.

[0013] Another aspect of the present invention provides a welding method for dumbbell-shaped steel tube concrete cross pillars as described above, wherein the various structures are connected by full penetration welds.

[0014] A further technical solution of the present invention is: the welding step specifically includes:

[0015] Step 1: Weld the node sleeve, node web, and reinforcing ring into two "semi-dumbbell" assemblies;

[0016] Step 2: Weld the two "semi-dumbbell" components to the left and right sides of the vertical stiffening plate respectively to obtain a complete dumbbell-shaped intersection node;

[0017] Step 3: Connect the dumbbell-shaped steel pipes of the four limbs to the stiffening plates, upper reinforcing rings, and lower reinforcing rings in the dumbbell-shaped nodes using bevel full penetration welds.

[0018] A third aspect of the present invention provides a natural draft cooling tower, comprising:

[0019] The cooling tower ring base has a circular ring structure.

[0020] Dumbbell-shaped steel-concrete composite cross pillars, which adopt the dumbbell-shaped steel-concrete composite cross pillars as described above;

[0021] Multiple dumbbell-shaped steel-concrete cross supports are sequentially arranged in a ring on the cooling tower ring base;

[0022] The tower is mounted on multiple dumbbell-shaped steel-concrete cross supports.

[0023] A further technical solution of the present invention is: by adjusting the cross-sectional dimensions of the dumbbell-shaped steel tube columns, the in-plane slenderness ratio of the cross-support is increased. equal to the out-of-plane slenderness ratio To reduce material waste, adjacent columns are given an in-plane constraint due to their intersection, where l1 and l2 represent the in-plane calculation length and the out-of-plane calculation length, respectively.

[0024] A further technical solution of the present invention is to replace the dumbbell-shaped steel tube concrete cross pillar with a single cross node with a dumbbell-shaped steel tube concrete cross pillar with multiple cross nodes.

[0025] This invention provides a natural ventilation cooling tower and its dumbbell-shaped steel-concrete cross support. The steel pipe serves as a formwork for the concrete, improving construction speed and quality. It also reduces the cross-sectional area of ​​the support, saving the floor space required for the cooling tower structure. The reduced cross-sectional size of the support can decrease the thickness of the lower ring beam of the tower, thereby saving the amount of concrete and steel reinforcement used in the tower and reducing construction costs.

[0026] Compared to circular steel-concrete composite columns, this invention proposes to use a dumbbell-shaped cross-section instead of a circular cross-section, based on the characteristic that the in-plane calculated length of the intersecting structure is less than the out-of-plane calculated length. The two circular tubes of the dumbbell-shaped cross-section are arranged in the out-of-plane direction to solve the material waste caused by the excess in-plane bearing capacity of the circular cross-section.

[0027] The dumbbell-shaped cross node of this invention is aesthetically pleasing, and all node reinforcements are arranged inside the inner node. Attached Figure Description

[0028] Figure 1 This is a disassembly diagram of the overall structure of the dumbbell-shaped steel tube concrete cross support according to an embodiment of the present invention;

[0029] Figure 2 This is an overall structural diagram of the dumbbell-shaped steel tube concrete cross support according to an embodiment of the present invention;

[0030] Figure 3 This is a top view of the overall structure of the dumbbell-shaped steel tube concrete cross support according to an embodiment of the present invention;

[0031] Figure 4 This is a structural diagram of a natural draft cooling tower according to an embodiment of the present invention;

[0032] Figure 5 (a) is a schematic diagram of the instability of the dumbbell-shaped steel-concrete composite cross support according to an embodiment of the present invention. Figure 5 (b) is a dumbbell-shaped cross section of a steel-concrete composite cross support. Figure 5 (c) is another dumbbell-shaped cross section. Figure 5 (d) is a circular cross-section. Detailed Implementation

[0033] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0034] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0036] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0038] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0039] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0040] An embodiment of the present invention provides a dumbbell-shaped steel-concrete composite cross support, specifically, as shown in... Figure 1 , Figure 2 , Figure 3 As shown, a dumbbell-shaped steel tube concrete cross support includes four dumbbell-shaped steel tube limbs 19 and a cross node. The ends of each dumbbell-shaped steel tube limb are connected to the cross node to form a cross structure. The cross node includes a vertical stiffening plate 20, an upper reinforcing ring 21 and a lower reinforcing ring 23 perpendicularly intersecting the vertical stiffening plate 20, several node sleeves 17, and multiple node webs 16 connecting the node sleeves. The node sleeves 17, node webs 16, upper reinforcing rings 21 and lower reinforcing rings 23 form a dumbbell-shaped structure with the vertical stiffening plate 20 as the central axis. The reinforcing rings have openings for concrete pouring and flow. The four dumbbell-shaped steel tube limbs 19 are located at the openings of the upper reinforcing rings 21 and lower reinforcing rings 23. The node sleeves 17, node webs 16, upper reinforcing rings, lower reinforcing rings 23, and four dumbbell-shaped steel tube limbs 19 form a closed space.

[0041] The cross node also includes a middle reinforcing ring 22, which is located between the upper reinforcing ring 21 and the lower reinforcing ring 23 and contacts the node sleeve 17 and the node web 16.

[0042] The dumbbell-shaped steel pipe column includes column webs (15, 18) that connect adjacent columns. The upper column web 15 and the lower column web 18 are respectively connected to the two ends of the node web 16.

[0043] Specifically, such as Figure 1 , 2 As shown in Figure 3, the X-shaped support consists of a node and four limbs (left upper limb, right upper limb, left lower limb, and right lower limb). The node is connected to the four dumbbell-shaped steel pipe limbs by a full penetration weld.

[0044] The internal structure of the cross node is as follows Figure 2 The intersection node consists of a vertical stiffening plate 20, a reinforcing ring, a node sleeve 17, and a node web 16, all connected by full penetration welds. The node sleeve 17, node web 16, upper reinforcing ring 21, lower reinforcing ring 23, and four limbs 19 form a closed space. Openings on the upper reinforcing ring 21, middle reinforcing ring 22, and lower reinforcing ring 23 facilitate concrete pouring and flow. The stiffening plate 20 not only increases the node's load-bearing capacity by increasing the steel content at the node section but also enhances the node's load-bearing capacity by preventing buckling of the node sleeve and increasing the confinement effect of the concrete. The reinforcing ring within the node enhances the node's load-bearing capacity by preventing buckling of the node sleeve and node web and increasing the confinement effect of the concrete.

[0045] Another embodiment is the welding method for the dumbbell-shaped steel-concrete composite cross-bracing structure described above, where the various structures are connected by full penetration welds. The welding steps specifically include:

[0046] Step 1: Weld the node sleeve, node web, and reinforcing ring into two "semi-dumbbell" assemblies;

[0047] Step 2: Weld the two "semi-dumbbell" components to the left and right sides of the vertical stiffening plate respectively to obtain a complete dumbbell-shaped intersection node;

[0048] Step 3: Connect the dumbbell-shaped steel pipes of the four limbs to the stiffening plates, upper reinforcing rings, and lower reinforcing rings in the dumbbell-shaped nodes using bevel full penetration welds.

[0049] Another embodiment is a natural draft cooling tower, such as Figure 4 As shown, it includes:

[0050] Cooling tower ring base 4, which is a circular ring structure;

[0051] Dumbbell-shaped steel-concrete composite cross support 2, which adopts the dumbbell-shaped steel-concrete composite cross support as described above;

[0052] A plurality of dumbbell-shaped concrete-filled steel tubular cross struts 2 are arranged in a ring on the cooling tower ring foundation 4 in sequence; there are piers 3 on the cooling tower ring foundation 4 for fixing the dumbbell-shaped steel tube columns 19 of the dumbbell-shaped concrete-filled steel tubular cross struts 2.

[0053] And the tower barrel 1 is arranged on a plurality of dumbbell-shaped concrete-filled steel tubular cross struts 2.

[0054] Specifically, the dumbbell-shaped concrete-filled steel tubular cross strut system is formed by circumferentially arraying single cross struts around the central axis of the natural draft cooling tower, as Figure 4 shown. Among them, the four corner points of a single X-shaped cross strut are on the same plane, and the two circles in the dumbbell are arranged along the normal direction of the plane (pointing to the central axis of the natural draft cooling tower), the circular steel tubes are connected by webs, and concrete is poured in the abdominal cavity. In addition, the dumbbell-shaped concrete-filled steel tubular cross strut system is not limited to the single cross strut system, and can also be used in the double cross strut system and the multi cross strut system.

[0055] As Figure 5 shown, by adjusting the cross-sectional dimensions of the dumbbell-shaped steel tube columns, the in-plane slenderness ratio of the cross strut is made equal to the out-of-plane slenderness ratio to reduce material waste. The adjacent columns give each other an in-plane constraint due to the cross, where l1 and l2 respectively represent the in-plane calculation length and the out-of-plane calculation length, and among them, I x and I y respectively refer to the moment of inertia of the cross section about the x-axis and the moment of inertia of the cross section about the y-axis, and A represents the cross-sectional area.

[0056] Specifically, as Figure 5 shown, the adjacent columns give each other an in-plane constraint due to the cross, resulting in the in-plane calculation length l1 being less than the out-of-plane calculation length l2. And for the circular cross section, since the in-plane flexural rigidity is equal to the out-of-plane flexural rigidity (EIx = EIy), there is an abundance in its in-plane bearing capacity, which further causes material waste. When using the Figure 4 shown dumbbell-shaped cross strut, the in-plane flexural rigidity of the dumbbell-shaped cross section is less than the out-of-plane flexural rigidity (EIx < EIy), so the in-plane slenderness ratio of the cross strut can be made equal to the out-of-plane slenderness ratio by adjusting the diameter d of the circular tube, the distance H between the two tubes, the width h of the web and the distance b between the webs of the dumbbell-shaped cross section, thereby reducing material waste and achieving the equal-strength design of the in-plane and out-of-plane bearing of the cross strut. When the width h of the web is relatively large, a connecting plate can be arranged in the abdominal cavity to prevent the web from bulging and failing.

[0057] In some other embodiments, the dumbbell-shaped concrete-filled steel tubular cross strut with multiple cross nodes is used to replace the dumbbell-shaped concrete-filled steel tubular cross strut with a single cross node.

[0058] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0059] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A dumbbell-shaped steel-concrete composite cross support, characterized in that, It includes four dumbbell-shaped steel pipe columns and cross nodes. The ends of each dumbbell-shaped steel pipe column are connected to the cross nodes to form a cross structure. The cross node includes a vertical stiffening plate, an upper reinforcing ring and a lower reinforcing ring arranged perpendicularly to the vertical stiffening plate, several node sleeves, and multiple node webs connecting the node sleeves. The node sleeves, node webs, upper reinforcing rings, and lower reinforcing rings form a dumbbell-shaped structure with the vertical stiffening plate as the central axis. The reinforcing rings are provided with openings for concrete pouring and flow. The four dumbbell-shaped steel pipe columns are set at the openings of the upper and lower reinforcing rings. The node sleeves, node webs, upper reinforcing rings, lower reinforcing rings, and four dumbbell-shaped steel pipe columns form a closed space.

2. The dumbbell-shaped steel-concrete composite cross support according to claim 1, characterized in that, The cross node also includes a middle reinforcing ring, which is located between the upper and lower reinforcing rings and contacts the node sleeve and the node web.

3. The dumbbell-shaped steel-concrete composite cross support according to claim 1, characterized in that, The dumbbell-shaped steel tube column includes a column web connecting adjacent columns, with the upper and lower column webs respectively connected to both ends of the node web.

4. A welding method for a dumbbell-shaped steel-concrete composite cross support as described in claim 1, characterized in that, The various structures are connected by full penetration welds.

5. The welding method according to claim 4, characterized in that, The welding steps specifically include: Step 1: Weld the node sleeve, node web, and reinforcing ring into two "semi-dumbbell-shaped" components; Step 2: Weld the two "semi-dumbbell" components to the left and right sides of the vertical stiffening plate respectively to obtain a complete dumbbell-shaped intersection node; Step 3: Connect the dumbbell-shaped steel pipes of the four limbs to the stiffening plates, upper reinforcing rings, and lower reinforcing rings in the dumbbell-shaped nodes using bevel full penetration welds.

6. A natural draft cooling tower, characterized in that, include: The cooling tower ring base has a circular ring structure. Dumbbell-shaped steel-concrete composite cross pillar, wherein the dumbbell-shaped steel-concrete composite cross pillar is as described in any one of claims 1 to 5; Multiple dumbbell-shaped steel-concrete cross supports are sequentially arranged in a ring on the cooling tower ring base; The tower is mounted on multiple dumbbell-shaped steel-concrete cross supports.

7. The natural draft cooling tower according to claim 6, characterized in that, By adjusting the cross-sectional dimensions of the dumbbell-shaped steel tube columns, the in-plane slenderness ratio of the cross-supports is improved. equal to the out-of-plane slenderness ratio To reduce material waste, adjacent columns are given an in-plane constraint due to their intersection, where l1 and l2 represent the in-plane and out-of-plane computational lengths, respectively. x and I y These refer to the moment of inertia of the cross section about the x-axis and the moment of inertia of the cross section about the y-axis, respectively, and A represents the cross-sectional area.

8. The natural draft cooling tower according to claim 6, characterized in that, Replace the dumbbell-shaped steel-concrete composite cross strut with a single cross node with a dumbbell-shaped steel-concrete composite cross strut with multiple cross nodes.

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