Double-layer reticulated shell steel structure hyperbolic cooling tower

Abstract

The utility model relates to a double-layer reticulated shell steel structure hyperbolic cooling tower, which is characterized in that a tower body is a hyperbolic paraboloid formed by rotating around a central shaft by taking an inclined straight line as a bus, the tower body comprises double-layer inclined struts, double-layer ring beams and reinforcing ring trusses, and the tower body forms an X-shaped unit of a corresponding layer through cross connection between the double-layer inclined struts from bottom to top; the axes of the double-layer inclined supporting columns coincide with the generatrix of the tower body, each X-shaped unit is provided with a double-layer ring beam, the double-layer inclined supporting columns and the double-layer ring beams are connected through separated connecting joints and are lattice type steel pipe components, and reinforcing ring trusses are arranged at the positions, at different heights, of the tower body respectively. The reinforcing ring trusses are fixedly connected with the double-layer ring beam on the layer; a widening platform is arranged between two adjacent X-shaped units at the bottommost part of the tower body, the widening platform is a three-chord reinforced truss, the widening platform is respectively and fixedly connected with the X-shaped unit at the bottommost part and the X-shaped unit at the upper layer, and an enclosure structure is arranged on a triangular grid formed by the double-layer inclined support columns and the double-layer ring beams.

Description

Technical Field

[0001] The utility model relates to a cooling tower, in particular to a double-layer lattice shell steel structure hyperbolic cooling tower. Background Art

[0002] Traditional cooling towers often use hyperbolic reinforced concrete thin shell structures. Although this structural form has been widely used and has achieved rich research results, the construction process of concrete towers is complicated, the construction efficiency is low, it will incur high construction costs, and the seismic performance of the structure is poor. With the development of steel structure technology, steel structures have been widely promoted and applied in hyperbolic cooling towers. Studies have shown that compared with traditional concrete towers, steel structure towers have the advantages of convenient installation, low installation costs, and good structural seismic performance.

[0003] A portion of the steel structure hyperbolic cooling tower in the prior art adopts a single-layer space lattice shell structure, that is, a single-layer solid-web circular steel pipe component is used to fit the shape of the hyperbolic tower body, and the purlins and skin are fixed on the single-layer diagonal columns of the tower body. Although the hyperbolic single-layer lattice shell steel structure has the advantages of simple structure and convenient component processing, due to the use of a single-layer ring beam, an additional construction platform is required, and the single-layer vertical component has weak stability during the installation process, which greatly increases the difficulty of installing the cooling tower and reduces the construction efficiency. In addition, the solid-web components used in the hyperbolic single-layer lattice shell steel structure cooling tower often require a larger cross-sectional size, which increases the amount of steel used in the project and the difficulty of processing.

[0004] In order to improve the overall rigidity and stability of the hyperbolic cooling tower, while reducing the amount of steel used and lowering the difficulty of construction, in recent years, a hyperbolic cooling tower with a double-layer lattice shell steel structure has gradually emerged, such as the "A Hyperbolic Double-layer lattice shell steel structure cooling tower" disclosed in the invention patent with announcement number CN105064739B. The bottom of the cooling tower in the patent is a lattice column, a conversion truss is arranged on the top of the lattice column, and a double-layer lattice shell tower is arranged on the top of the conversion truss. The tower is composed of horizontal plane trusses and vertical plane trusses that are orthogonally connected. The cooling tower of this structure is divided into three parts from bottom to top. The tower needs to be connected to the bottom lattice column through a conversion truss, which makes the entire structural system and stress characteristics more complicated. In addition, there are a large number of steel pipe intersection nodes in the lattice shell structure. In the prior art, multiple steel pipes are intersected at one point by intersecting welding or ball nodes. This intersection node structure has high requirements on the assembly accuracy of the steel pipes. There are a large number of weld intersections at the intersection of the steel pipes, which makes the welding residual stress in the node area complicated and the node welding quality cannot be guaranteed. The setting of the ball node also increases the overall steel consumption of the structure, and the economy is poor. Utility Model Content

[0005] In view of the fact that the double-layer lattice shell steel structure hyperbolic cooling tower in the above-mentioned prior art still has some shortcomings, the utility model makes the cooling tower structure system single, the force characteristics are clear, and the assembly difficulty of multi-tube intersection nodes is reduced through structural improvements, which improves the rigidity and stability of the hyperbolic cooling tower as a whole, and also improves the construction efficiency and economy.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] The invention discloses a double-layer lattice shell steel structure hyperbolic cooling tower. The tower body of the cooling tower is a hyperbolic parabola formed by rotating around a central axis with an oblique straight line as a generatrix. The tower body comprises double-layer oblique pillars, double-layer ring beams and reinforced ring trusses. The tower body forms X-shaped units of corresponding layers from bottom to top through cross connection between the double-layer oblique pillars. The axis of the double-layer oblique pillars coincides with the generatrix of the tower body. A double-layer ring beam is arranged at each X-shaped unit. The double-layer oblique pillars and the double-layer ring beams are connected by separated connection nodes. Both the double-layer oblique pillars and the double-layer ring beams are lattice steel pipe components. Reinforced ring trusses are respectively arranged at different heights of the tower body. The reinforced ring trusses are fixedly connected to the double-layer ring beams of the layer where they are located. A widening platform is arranged between two adjacent X-shaped units at the bottom of the tower body. The widening platform is a three-chord reinforced truss. The widening platform is fixedly connected to the bottom X-shaped unit and the upper X-shaped unit respectively. A protective structure is installed on the triangular grid formed by the double-layer oblique pillars and the double-layer ring beams.

[0008] Furthermore, the double-layer diagonal strut includes an outer chord and an inner chord arranged in parallel, and the outer chord and the inner chord are connected by an diagonal strut diagonal web; the double-layer ring beam includes an outer chord and an inner chord arranged concentrically and coplanarly, and the outer chord and the inner chord are connected by a straight web.

[0009] Furthermore, the reinforcing ring truss includes reinforcing ring truss circumferential rods and reinforcing ring truss diagonal rods, the reinforcing ring truss circumferential rods are arranged on the inner circle side of the inner chord rods of the ring beam, the reinforcing ring truss circumferential rods are connected to the inner chord rods of the ring beam of the same layer through the reinforcing ring truss diagonal rods, and the reinforcing ring truss circumferential rods are connected to the inner chord rods of the ring beam of the next layer through the diagonal bracing rods.

[0010] Furthermore, the widening platform includes widening platform annular rods and widening platform diagonal rods. The widening platform annular rods are arranged on one side of the outer circle of the tower body. The widening platform annular rods are connected to the intersection of the bottom X-shaped unit through the widening platform diagonal rods. The widening platform annular rods are connected to the intersection of the upper layer of X-shaped units adjacent to the bottom X-shaped unit through the widening platform diagonal rods.

[0011] Furthermore, the enclosure structure includes main purlins, secondary purlins and a skin, the main purlins are arranged parallel to the double-layer ring beam, the secondary purlins are arranged parallel to the inclined generatrix of the tower body, the two ends of the main purlins and the secondary purlins are respectively fixedly connected to the double-layer inclined struts, the intersection of the main purlins and the secondary purlins is fixedly connected, the secondary purlins are fixedly connected to the double-layer ring beam, and the skin is fixedly installed on the main purlins and the secondary purlins.

[0012] Furthermore, the double-layer oblique struts and the double-layer ring beam are connected to form a separate connection node through a connecting short tube, one end of the connecting short tube is connected to the intersection of the chord of the double-layer oblique struts, and the other end of the connecting short tube is connected to the chord of the double-layer ring beam.

[0013] Furthermore, at the intersection of each separate connection node, among the steel pipes where the double-layer oblique struts intersect, one of the steel pipes is a complete steel pipe, and the other steel pipe is formed by welding two sections of steel pipes to the complete steel pipe.

[0014] Furthermore, at the intersection of each separate connection node, the chord of the double-layer ring beam is a complete steel pipe, and the chord of the double-layer ring beam is welded and fixed to the connecting short pipe.

[0015] Furthermore, at the intersection of each separate connection node, the chord of the double-layer ring beam is composed of two sections of steel pipes, and the two sections of steel pipes are respectively welded to both sides of the connecting short pipe.

[0016] The hyperbolic cooling tower designed by the utility model adopts a double-layer steel grid shell structure. Compared with the hyperbolic cooling tower with a single-layer grid shell structure, a construction platform is naturally formed between the inner and outer chords of the double-layer ring beams arranged on each layer, and there is no need to build an additional construction platform, which simplifies the construction process and improves the construction efficiency. In addition, the tower body is constructed of double-layer lattice-type round steel pipe components, and the cross-sectional size of the rods is small, which reduces the amount of steel used, reduces the manufacturing cost, and the overall rigidity and stability of the cooling tower are higher; compared with the hyperbolic cooling tower with a double-layer grid shell structure in the prior art, the tower body of the utility model does not need to be separately set up with a conversion layer from bottom to top, the entire structural system is single, the force characteristics are clear, and all vertical main components are "straight busbars", which are simpler and more reliable to process and install; the utility model also adopts a separate connection node to solve the construction inconvenience problem caused by the intersection of multiple steel pipes, reduces the difficulty of assembling the intersection of multiple steel pipes, improves the installation accuracy and efficiency, reduces the cross welds, and improves the welding quality of the connection nodes. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an overall structural diagram of a double-layer lattice shell steel structure hyperbolic cooling tower in the embodiment;

[0018] Figure 2 for Figure 1 Schematic diagram of the location of the middle reinforcing ring truss and the widening platform;

[0019] Figure 3 for Figure 1 A partial schematic diagram of the connection between the double-layer inclined support and the double-layer ring beam in the cooling tower;

[0020] Figure 4 for Figure 1 Schematic diagram of the cooling tower's double-layer inclined struts forming an X-shaped unit;

[0021] Figure 5 for Figure 1 Schematic diagram of the double-layer inclined support and double-layer ring beam in the cooling tower using separate connection nodes;

[0022] Figure 6 It is another schematic diagram of a separated connection node;

[0023] Figure 7 It is a three-dimensional schematic diagram of the local structure where the reinforcing ring truss is provided;

[0024] Figure 8 It is a three-dimensional schematic diagram of the local structure at the widening platform.

[0025] Description of Figure Numbers:

[0026] 1. Double-layer oblique support; 1-1. Outer chord of oblique support; 1-2. Inner chord of oblique support; 1-3. Oblique brace of oblique support;

[0027] 2. Double-layer ring beam; 2-1. Ring beam outer chord; 2-2. Ring beam inner chord; 2-3. Ring beam straight web;

[0028] 3. Strengthening ring truss; 3-1. Strengthening ring truss annular rod; 3-2. Strengthening ring truss diagonal rod;

[0029] 4. Widening platform; 4-1. Widening platform circumferential rod; 4-2. Widening platform oblique rod;

[0030] 5. Diagonal brace;

[0031] A1, first oblique support chord; A2, second oblique support chord; A3, third oblique support chord; A4, ring beam chord; A4-1, first ring beam chord; A4-2, second ring beam chord; A5, connecting short pipe. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0033] This embodiment discloses a double-layer lattice shell steel structure hyperbolic cooling tower, such as Figure 1 and Figure 2As shown in FIG. 1 , the cooling tower body is a hyperbolic parabola formed by rotating around the central axis with the oblique straight line as the generatrix. The entire tower body is composed of double-layer oblique pillars 1, double-layer ring beams 2, reinforcing ring trusses 3 and widening platforms 4. The tower body passes from bottom to top between the double-layer oblique pillars 1 as shown in FIG. Figure 4 The cross connection shown forms a plurality of X-shaped units, each intersection being a layer of the cooling tower, and the axis of the double-layer oblique pillar 1 in the tower body coincides with the generatrix of the tower body. A double-layer ring beam 2 is arranged on one side of the inner circle of each X-shaped unit, and the intersection of the double-layer oblique pillar 1 is fixedly connected to the double-layer ring beam 2. In order to further improve the rigidity and stability of the cooling tower, according to the height design of the cooling tower, reinforcing ring trusses 3 can be arranged at different heights, so that the reinforcing ring trusses 3 are fixedly connected to the double-layer ring beam 2 of the layer. A widening platform 4 is also arranged between the two adjacent X-shaped units at the bottom of the tower body. The widening platform 4 is a three-chord reinforced truss, which strengthens the force on the bottom of the tower body, and the widening platform 4 is fixedly connected to the bottom X-shaped unit and the upper layer of the X-shaped unit respectively. A protective structure is installed on the triangular grid formed by the bidirectional oblique pillar 1 and the bidirectional ring beam 2 (the protective structure is omitted in the drawings of this embodiment). The enclosure structure includes a main purlin, a secondary purlin and a skin. The main purlin is arranged parallel to the double-layer ring beam 2, the secondary purlin is arranged parallel to the oblique generatrix of the tower body, the two ends of the main purlin and the secondary purlin are respectively fixedly connected to the double-layer oblique pillar 1, the intersection of the main purlin and the secondary purlin is fixedly connected, the secondary purlin is fixedly connected to the double-layer ring beam 2, and the skin is fixedly installed on the main purlin and the secondary purlin. Since the double-layer oblique pillar 1 formed by the hollow circular steel pipe member is used in this embodiment, its axis coincides with the generatrix of the tower body, so that the double-layer oblique pillar 1 can directly bear the wind load transmitted from the skin structure, so the purpose of reducing the number of purlins, simplifying the node method, and reducing the amount of purlins can be achieved.

[0034] like Figure 3 As shown, the double-layer oblique struts 1 and the double-layer ring beams 2 in this embodiment are both lattice steel pipe components, wherein the double-layer oblique struts 1 are composed of an oblique strut outer chord 1-1, an oblique strut inner chord 1-2, and an oblique strut diagonal web 1-3 connecting the oblique strut outer chord 1-1 and the oblique strut inner chord 1-2 arranged in parallel. The double-layer ring beam 2 is composed of a ring beam outer chord 2-1, a ring beam inner chord 2-2, and a ring beam straight web 2-3 connecting the ring beam outer chord 2-1 and the ring beam inner chord 2-2 arranged concentrically and coplanarly. A ring beam diagonal web can also be added between the ring beam outer chord 2-1 and the ring beam inner chord 2-2 to make the inner and outer chords more evenly stressed, which is omitted in the drawings.

[0035] like Figure 7As shown, the reinforcing ring truss 3 in this embodiment is composed of reinforcing ring truss circumferential rods 3-1 and reinforcing ring truss diagonal rods 3-2. Among them, the reinforcing ring truss circumferential rods 3-1 are arranged on the inner circle side of the inner chord rods 2-2 of the ring beam of the layer, and the reinforcing ring truss circumferential rods 3-1 and the inner chord rods 2-2 of the ring beam of the layer are fixedly connected through the reinforcing ring truss diagonal rods 3-2, and the reinforcing ring truss circumferential rods 3-1 are also fixedly connected to the inner chord rods 2-2 of the ring beam of the next layer of the layer through a plurality of diagonal bracing rods 5.

[0036] like Figure 8 As shown, the widening platform 4 in this embodiment is a three-chord reinforced truss composed of a widening platform annular rod 4-1 and a widening platform diagonal rod 4-2, wherein the widening platform annular rod 4-1 is arranged on one side of the outer circle of the tower body, and the widening platform annular rod 4-1 and the intersection of the bottom X-shaped unit of the tower body are fixedly connected through the widening platform diagonal rod 4-2, and the widening platform annular rod 4-1 and the intersection of the upper layer of X-shaped units adjacent to the bottom X-shaped unit are also fixedly connected through the widening platform diagonal rod 4-2.

[0037] In view of the fact that there are multiple steel pipes intersecting at one point in the cooling tower, the existing technology mainly adopts multiple cut steel pipes to be assembled together at the node by intersecting welding. When the fracture shape error of the cut steel pipe is large, it brings difficulty to assemble at the intersection, and there are a large number of weld intersections at the intersection. The cross welds in the node area are repeatedly heated, which makes the welding residual stress in the node area complicated and the node quality cannot be guaranteed. In the process of welding multiple pipes, the later welded steel pipes will conceal and block the previous construction welds, and the appearance quality and internal defects of the hidden welds cannot be detected, which poses certain quality and safety risks. Based on the above reasons, the cooling tower designed by the utility model adopts the following method: the double-layer inclined support 1 and the double-layer ring beam 2 are connected by the double-layer inclined support 1 and the double-layer ring beam 2. Figure 5 or Figure 6 Connect the split connection nodes shown. Figure 5 and Figure 6 In order to simplify the illustration, all are shown in the form of a single-layer grid. For the separated connection nodes of the double-layer grid shell structure of the utility model, Figure 3 As can be seen from the figure, the outer chord 1-1 of the diagonal support and the outer chord 2-1 of the ring beam adopt a separate connection node, and the inner chord 1-2 of the diagonal support and the inner chord 2-2 of the ring beam adopt a separate connection node.

[0038] Combination Figure 5 To illustrate, assume Figure 5 It is a separate connection node between the outer chord 1-1 of the diagonal support and the outer chord 2-1 of the ring beam. Figure 5A total of five round steel pipes are marked, among which A1 is the outer chord of one of the double-layer inclined struts 1, referred to as the first inclined strut chord, and A1 is a complete steel pipe; A2 and A3 are two sections of cut steel pipes, A2 is referred to as the second inclined strut chord, and A3 is referred to as the third inclined strut chord. A2 and A3 are welded to A1 through intersection, and A1, A2, and A3 form an X-shaped node with four branches. A short steel pipe is welded perpendicular to the plane formed by A1, A2, and A3 at the X-shaped node as a connecting short pipe A5. The connecting short pipe A5 should be as short as possible while meeting the assembly operation space, so as to ensure that the mechanical properties of the node meet the design requirements. A4 is the outer chord of the double-layer ring beam 2, referred to as the ring beam chord. A4 is welded and fixed to the other end of the connecting short pipe A5, thereby dividing the multiple steel pipes that originally intersected at only one intersection into two intersections. This separate structure allows for a small amount of error when multiple steel pipes meet, greatly reducing the difficulty of assembly. In addition to A1 being a complete steel pipe, A4 can also be a complete steel pipe. The number of cross welds is reduced, and the welds at the nodes are dispersed, reducing the residual stress generated by welding; the number of hidden welds is reduced, and most welds are visible to the naked eye, which facilitates the inspection of weld appearance quality and internal defects, reducing the difficulty of welding quality control. For the steel pipe at A4, the following can also be used: Figure 6 In the structure shown, A4 is divided into two sections of steel pipes, namely the first ring beam chord A4-1 and the second ring beam chord A4-2. The two sections of steel pipes are respectively welded to the two sides of the connecting short pipe A5. A4 is preferably assembled using a complete steel pipe.

[0039] When installing the double-layer lattice shell steel structure hyperbolic cooling tower given above, firstly, a support frame is set at the first-layer node, and the X-shaped unit of the first-layer tower body is assembled on the support frame, and the X-shaped unit of this layer is assembled and welded with the double-layer ring beam 2 of this layer; then a support frame is set at the second-layer node, and the above steps are repeated to complete the assembly of the second-layer tower body; then the widening platform 4 is installed, and after the widening platform 4 is installed, the support frames of the first and second layers can be removed; subsequently, the assembly is carried out layer by layer from bottom to top, and at the tower layer that needs to be strengthened, a reinforcing ring truss 3 needs to be installed; after the assembly of the entire tower body is completed, the installation of the enclosure structure is completed layer by layer from bottom to top.

[0040] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A double-layer lattice shell steel structure hyperbolic cooling tower, characterized in that: The tower body of the cooling tower is a hyperbolic parabola formed by rotating around the central axis with an oblique straight line as the generatrix. The tower body includes double-layer oblique pillars, double-layer ring beams, and reinforced ring trusses. The tower body forms X-shaped units of corresponding layers from bottom to top through cross-connections between double-layer oblique pillars. The axis of the double-layer oblique pillars coincides with the generatrix of the tower body. A double-layer ring beam is arranged at each X-shaped unit. The double-layer oblique pillars and the double-layer ring beams are connected by separate connection nodes. Both the double-layer oblique pillars and the double-layer ring beams are lattice steel pipe components. Reinforced ring trusses are arranged at different heights of the tower body, and the reinforced ring trusses are fixedly connected to the double-layer ring beams of the layer where they are located. A widening platform is arranged between two adjacent X-shaped units at the bottom of the tower body. The widening platform is a three-chord reinforced truss. The widening platform is fixedly connected to the bottom X-shaped unit and the upper X-shaped unit respectively. The enclosure structure is installed on the triangular grid formed by the double-layer oblique pillars and the double-layer ring beams.

2. A double-layer lattice shell steel structure hyperbolic cooling tower according to claim 1, characterized in that: The double-layer diagonal struts include an outer chord rod and an inner chord rod of the diagonal struts arranged in parallel, and the outer chord rod and the inner chord rod of the diagonal struts are connected by an diagonal strut diagonal web rod; the double-layer ring beam includes an outer chord rod and an inner chord rod of the ring beam arranged concentrically and coplanarly, and the outer chord rod and the inner chord rod of the ring beam are connected by a straight web rod of the ring beam.

3. A double-layer lattice shell steel structure hyperbolic cooling tower according to claim 2, characterized in that: The reinforcing ring truss comprises reinforcing ring truss circumferential rods and reinforcing ring truss diagonal rods. The reinforcing ring truss circumferential rods are arranged on one side of the inner circle of the inner chord rods of the ring beam. The reinforcing ring truss circumferential rods are connected to the inner chord rods of the ring beam of the same layer through the reinforcing ring truss diagonal rods. The reinforcing ring truss circumferential rods are connected to the inner chord rods of the ring beam of the next layer through the diagonal bracing rods.

4. A double-layer lattice shell steel structure hyperbolic cooling tower according to claim 1, characterized in that: The widening platform includes widening platform annular rods and widening platform oblique rods. The widening platform annular rods are arranged on one side of the outer circle of the tower body. The widening platform annular rods are connected to the intersection of the bottom X-shaped unit through the widening platform oblique rods. The widening platform annular rods are connected to the intersection of the upper layer of X-shaped units adjacent to the bottom X-shaped unit through the widening platform oblique rods.

5. The double-layer lattice shell steel structure hyperbolic cooling tower according to claim 1, characterized in that: The enclosure structure includes main purlins, secondary purlins and skins. The main purlins are arranged parallel to the double-layer ring beams, and the secondary purlins are arranged parallel to the inclined generatrix of the tower body. Both ends of the main purlins and the secondary purlins are respectively fixedly connected to the double-layer inclined struts, the intersection of the main purlins and the secondary purlins is fixedly connected, the secondary purlins are fixedly connected to the double-layer ring beams, and the skins are fixedly installed on the main purlins and the secondary purlins.

6. A double-layer lattice shell steel structure hyperbolic cooling tower according to claim 2, characterized in that: The double-layer oblique support and the double-layer ring beam are connected to form a separate connection node through a connecting short tube, one end of the connecting short tube is connected to the chord intersection of the double-layer oblique support, and the other end of the connecting short tube is connected to the chord of the double-layer ring beam.

7. A double-layer lattice shell steel structure hyperbolic cooling tower according to claim 6, characterized in that: At the intersection of each separate connection node, among the steel pipes where the double-layer inclined struts intersect, one of the steel pipes is a complete steel pipe, and the other steel pipe is formed by welding two sections of steel pipes to the complete steel pipe.

8. The double-layer lattice shell steel structure hyperbolic cooling tower according to claim 7, characterized in that: At the intersection of each separate connection node, the chord of the double-layer ring beam is a complete steel pipe, and the chord of the double-layer ring beam is welded and fixed to the connecting short pipe.

9. The double-layer lattice shell steel structure hyperbolic cooling tower according to claim 7, characterized in that: At the intersection of each separate connection node, the chord of the double-layer ring beam is composed of two sections of steel pipes, which are welded to both sides of the connecting short pipe.

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