A construction method for installing the built-in skin of a steel structure indirect cooling tower

Abstract

The present invention discloses a construction method for installing built-in skins in a steel structure indirect cooling tower, which specifically includes the following steps: Step S1: Pre-installation; Step S2: Preliminary positioning; Step S3: Installation of protective aluminum plates; Step S4: Installation of aluminum plate joints; Step S5: Overall installation. In this technical solution, the protective aluminum plates are first installed on the main single-piece steel triangle on the ground and then hoisted as a whole. By adopting this construction method, the safety factor and work efficiency are improved, while the high-altitude operation is reduced, the construction cost is lowered, and the construction safety is ensured. At the same time, when installing the protective aluminum plates on the single-piece steel triangle, the positions of self-tapping screws are pre-determined on the protective aluminum plates through a marking device to ensure that the self-tapping screws connecting the protective aluminum plates and the steel triangle purlins in the later stage are at reasonable intervals, thereby improving the uniform stress of the protective aluminum plates installed on the steel triangle.

Description

Technical Field

[0001] The present invention relates to the technical field of indirect cooling tower construction, and specifically to a construction method for installing built-in skin in a steel structure indirect cooling tower. Background Art

[0002] For a certain project, two million-kilowatt unit "five-tower-in-one" indirect cooling towers need to be newly built. The skin is built-in and the strengthening ring is built-out. The core of the indirect cooling tower is a desulfurization flue tower. The air-cooled radiators of the main and auxiliary systems are vertically arranged around the outside of the indirect cooling tower. The tower body of the indirect cooling tower is all steel structure, including the lower cone, cylindrical tower body, external strengthening ring, widened platform, upper tower ladder, built-in aluminum protection board, etc. The steel tower is 190.5 m high. The bottom diameter of the lower cone is 127 m, the height of the cone is 61.5 m, the diameter of the upper cylindrical tower body is 90 m, and the height of the cylindrical tower body is 129 m. The indirect cooling tower is assembled by triangular frames, external strengthening rings, widened platforms and built-in aluminum protection boards. The tower bodies are all steel structures. The steel structure weight of a single tower body is about 4,200 t, and the built-in aluminum protection board of a single tower is about 47,631 m². Each layer of triangular frames has 28 bays. The cone part is composed of 6 layers of triangular frames (the maximum mass of a single-piece triangular frame is about 9.6 tons), and the upper cylindrical tower body is composed of 12 layers of triangular frames (the maximum mass of a single-piece triangle is about 8.6 tons). There are 4 layers of strengthening rings outside the upper cylindrical tower body. Each layer of strengthening ring has 28 bays, and the weight is about 200 tons. The elevation marks of the strengthening rings are 61.1 m, 103.9 m, 146.7 m, and 178.8 m respectively. The built-in aluminum protection board in the tower body is sealed by aluminum alloy profiled sheets (about 47,631 m²).

[0003] Since the main tower body of the new indirect cooling tower is all steel structure, which is assembled and welded by lattice-type triangular frames, an attached skin is designed on the steel triangle of the main unit of the steel tower as a sealing and protective layer of the tower body. If the skin is placed outside the tower body, the main function of the skin is to form a sealed space around the tower body, ensure the draft of the cooling tower, improve the ventilation capacity, prevent cold air from invading the tower, and ensure the draft and heat dissipation capacity of the indirect cooling tower from bottom to top. If the skin is placed inside the tower body, it is because the desulfurization absorption tower and chimney are arranged inside the tower. In addition to ensuring the sealing, draft and heat dissipation capacity, it also needs to play a role of direct corrosion isolation, avoiding the direct corrosion of the steel triangle frame of the main body of the steel tower and extending the service life of the steel structure tower. From the fifth layer of the cone section to the 18th layer of the straight cylinder section and the widened platform, each layer of triangular frames has 28 bays, with a total of 28×(14 + 1) = 420 bays of triangular frames attached with skin, as well as small sealing plates between bays. The skin is assembled by aluminum alloy protection boards, with an area of about 47,631 ㎡. At present, for some built-in skins of steel structure indirect cooling towers, the aluminum protection boards are hoisted and then installed with the steel triangles after the steel triangles are hoisted. This kind of operation has more high-altitude operations, greater construction difficulty, and the safety factor and work efficiency need to be improved. Summary of the Invention

[0004] The purpose of the present invention is to provide a construction method for installing the built-in skin of a steel structure indirect cooling tower to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A construction method for installing the built-in skin of a steel structure indirect cooling tower specifically includes the following steps:

[0007] Step S1: Pre-installation: Assemble and weld the single-piece steel triangle of the indirect cooling tower on the ground. After passing the acceptance, install purlins on the single-piece steel triangle.

[0008] Step S2: Preliminary positioning: After installing the purlins, confirm the angles of the purlins in the single-piece steel triangle, and then use a marking device to mark the installation positions of self-tapping screws on the outer wall of the protective aluminum plate that needs to be installed on the purlins. After marking, arrange self-tapping screws at the self-tapping screw installation positions.

[0009] Step S3: Installation of the protective aluminum plate: First, mark the center line from bottom to top on the upper part of the purlins of the single-piece steel triangle as the reference line, and arrange the protective aluminum plates evenly from the middle to both sides. Connect and fix the protective aluminum plates on both sides of the reference line, adjacent protective aluminum plates, and protective aluminum plates with unequal widths on both sides in sequence through the self-tapping screws arranged on the protective aluminum plates.

[0010] Step S4: Installation of the aluminum plate joint: Install and fix the aluminum plates on the upper parts of the protective aluminum plates on both sides of the reference line, and carry out the installation work of the middle aluminum plate joint at the middle position of the single-piece steel triangle. After the installation of the middle aluminum plate joint is completed, use tools to fix the middle aluminum plate joint and the fixed aluminum plate with bolts; when installing the aluminum plate joint between two single-piece steel triangles, pre-fix the galvanized screws on the aluminum plate joint on the ground, then weld the galvanized screws to the purlins, and then carry out the construction after the installation of the two single-piece steel triangles at high altitude is completed.

[0011] Step S5: Overall installation: Gradually complete the installation work of the protective aluminum plates of each layer of the steel triangle of the indirect cooling tower. After all the protective aluminum plates of the lower layer are installed, install the protective aluminum plates of the upper layer layer by layer, and then hoist the steel triangle with the installed protective aluminum plates.

[0012] Further improvement lies in that the marking device in step S2 includes an installation frame, a fixing component, a bearing seat, a screw driving component, a longitudinal guiding frame, a transverse guiding frame, a connecting slider, a measuring driving wheel component, a telescopic device I, a movable frame, a moving part, and a marking component;

[0013] The fixed component is arranged on the mounting frame and is used to fix the mounting frame and the protection aluminum plate. The bearing seat is slidably arranged on the mounting frame. The screw driving component is arranged on the mounting frame and is used to drive the bearing seat to move along the length direction of the mounting frame. The longitudinal guiding frame is arranged on one side of the bearing seat and is perpendicular to the mounting frame. The transverse guiding frame is perpendicularly arranged outside the longitudinal guiding frame. One end of the connecting slider is fixed at the middle part of the inner cavity of the transverse guiding frame, and the other end is slidably located in the longitudinal guiding frame. One side of the connecting slider is provided with a shaft body. A longitudinal through port for the shaft body to move is opened on the side wall of the longitudinal guiding frame. A measuring driving wheel assembly is arranged on the outer wall of the shaft body and is used to contact the outer wall of the protection aluminum plate. The first telescopic device is arranged on the longitudinal guiding frame and is used to drive the connecting slider to move in the longitudinal guiding frame. The movable frame is arranged above the transverse guiding frame and is driven to move up and down by the measuring driving wheel assembly. There are two groups of moving parts, which are respectively slidably arranged at both ends of the inner cavity of the transverse guiding frame. Marking components are arranged on both the moving parts and the connecting slider, and the marking components are also connected to the movable frame.

[0014] A further improvement lies in that the measuring driving wheel assembly includes a wheel body, a circular ring part, an arc-shaped inner concave opening, a top rod and a return spring;

[0015] The wheel body is rotatably sleeved on the outer wall of the shaft body. The circular ring part is arranged on the outer side wall of the wheel body. The arc-shaped inner concave opening is opened on the circumferential outer wall of the circular ring part. The top rod is vertically arranged on one side of the connecting slider through a bracket. One end of the top rod is in sliding contact with the outer wall of the circular ring part, and the other end is connected to the movable frame. A return spring for driving the top rod to reset is arranged on the outer wall of the top rod. When one end of the top rod contacts the bottom inner wall of the arc-shaped inner concave opening, one end of the marking component contacts the outer wall of the protection aluminum plate.

[0016] A further improvement lies in that the measuring driving wheel assembly further includes a fixing ring and locking teeth;

[0017] The fixing ring is arranged on the outer side wall of the wheel body and is coaxial with the wheel body. The circular ring part is movably sleeved on the outer wall of the fixing ring. The locking teeth are slidably arranged on the outer wall of the circular ring part. A plurality of groups of tooth grooves for one end of the locking teeth to insert are opened on the circumferential outer wall of the fixing ring. An elastic member for driving one end of the locking teeth to be in the tooth grooves is arranged between the locking teeth and the circular ring part.

[0018] A further improvement lies in that the measuring driving wheel assembly further includes a pointing mark. The pointing mark is arranged in the arc-shaped inner concave opening and is inside the top rod. An annular scale cooperating with the pointing mark is arranged on the outer side wall of the wheel body.

[0019] A further improvement lies in that the moving part includes a follower block and a moving block; the follower block is slidably arranged on the movable frame. The moving block is slidably arranged on the transverse guiding frame and is connected to the follower block through a support rod. A second telescopic device for driving the moving block to move along the length direction of the movable frame is arranged on the side wall of the movable frame.

[0020] A further improvement lies in that the marking assembly includes a second adjusting screw rod and a marking pen; the second adjusting screw rod is threadedly inserted into the movable frame or the follower block, and movable through holes for the second adjusting screw rod to extend into are formed through the connecting slider and the moving block, and one end of the second adjusting screw rod extends into the movable through hole and is movably connected to the marking pen.

[0021] A further improvement lies in that a scale ruler horizontal to the length direction of the horizontal guiding frame is provided on the horizontal guiding frame.

[0022] A further improvement lies in that the fixing assembly includes two groups of fixing seats, the two groups of fixing seats are respectively slidably arranged on both sides of the bottom surface of the mounting frame, the fixing seats are threadedly sleeved on the outer wall of the first adjusting screw rod, and one end of the first adjusting screw rod threadedly penetrates through the side wall of the mounting frame.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] In this technical solution, the protective aluminum plate is first installed on the main single-piece steel triangle on the ground and then hoisted integrally. By adopting this construction method, the safety factor and work efficiency are improved, at the same time, the high-altitude operation is reduced, the construction cost is lowered, the construction safety is ensured, and when the protective aluminum plate is installed on the single-piece steel triangle, the position of the self-tapping screws is determined on the protective aluminum plate in advance through the marking device to ensure that the self-tapping screws connecting the protective aluminum plate and the steel triangle purlin are at a reasonable spacing in the later stage, and the stress uniformity of the protective aluminum plate installed on the steel triangle is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic structural diagram of the present invention;

[0026] Figure 2 is the present invention Figure 1 a partial structural diagram thereof;

[0027] Figure 3 is a schematic structural diagram of the longitudinal guiding frame of the present invention;

[0028] Figure 4 is the present invention Figure 3 a partial structural diagram thereof;

[0029] Figure 5 is a schematic structural diagram of the measuring driving wheel assembly in the present invention;

[0030] Figure 6 is a diagram of the insertion spacing of the aluminum plate joints in the present invention;

[0031] Figure 7 is a schematic diagram of the position of the aluminum plate joints in the present invention.

[0032] In the figure: 1, mounting bracket; 2, fixed seat; 3, first adjusting screw rod; 4, bearing seat; 5, screw driving assembly; 6, longitudinal guiding frame; 61, longitudinal through port; 7, transverse guiding frame; 8, connecting slider; 9, measuring driving wheel assembly; 91, wheel body; 92, circular ring part; 93, arc-shaped concave opening; 94, ejector rod; 95, return spring; 96, fixed ring; 97, locking tooth; 98, pointing mark; 10, first telescopic device; 11, movable frame; 12, follower block; 13, moving block; 14, marking assembly; 141, second adjusting screw rod; 142, marking pen; 15, second telescopic device; 16, scale. Specific implementation mode

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0034] Embodiment 1

[0035] A construction method for installing the built-in skin in a steel structure indirect cooling tower. The built-in skin is the protective aluminum plate. The installation of the protective aluminum plate is mainly carried out on the ground, and specifically includes the following steps:

[0036] Step S1: Pre-installation: Assemble and weld the single-plane steel triangle of the indirect cooling tower on the ground. After passing the acceptance, install purlins on the single-plane steel triangle. The purlins are specifically installed on the steel triangle by using purlin supports. The installation verticality and elevation angle deviation of the protective aluminum plate are controlled by the purlin supports. The height of the purlin bracket is controlled according to the design drawing to control the installation verticality and elevation angle of the protective aluminum plate;

[0037] Step S2: Preliminary positioning: After the purlins are installed, confirm the angles of the purlins in the single-plane steel triangle (including overall verticality, levelness, and circularity, etc.). Then, mark the self-tapping screw installation positions on the outer wall of the protective aluminum plate that needs to be installed on the purlins through a marking device. After marking, arrange self-tapping screws at the self-tapping screw installation positions. Specifically, the longitudinal fixed spacing of the self-tapping screws of the built-in protective aluminum plate is 270 mm. At the peak position, the transverse fixed spacing is 270 mm. At the trough position, it is connected to the purlins. When performing the self-tapping screw operation, first determine the self-tapping screw installation positions through the marking device, so as to ensure that the subsequent arranged self-tapping screws are at reasonable intervals and ensure that the installed protective aluminum plate is evenly stressed;

[0038] Step S3: Installation of the protective aluminum plate: First, mark the center line (i.e., the highest point position of each purlin) from bottom to top on the upper part of a single-piece steel triangular purlin as the reference line. Arrange the protective aluminum plates evenly from the middle to both sides, perform pre-layout of the protective aluminum plates, confirm that the specifications and positions of the protective aluminum plates are correct, and connect and fix the protective aluminum plates on both sides of the reference line, adjacent-position protective aluminum plates, and protective aluminum plates with unequal widths on both sides in sequence through self-tapping screws arranged on the protective aluminum plates until all the installation work of the protective aluminum plates is completed;

[0039] Step S4: Installation of the aluminum plate joint (rib): There are two positions for the aluminum plate joint (rib). One is located in the middle position of a single-piece steel triangle, and this part can be installed on the ground. The other is located between two steel triangles. This part needs to be constructed after the high-altitude installation of the two steel triangles is completed. To ensure the tightness requirements between each single-piece aluminum plate during high-altitude operation, the specific method is as follows: Install and fix the aluminum plate on the upper part of the protective aluminum plates on both sides of the reference line, and carry out the installation work of the middle aluminum plate joint at the middle position of the single-piece steel triangle. After the installation of the middle aluminum plate joint is completed, use tools (large pliers) to fix the middle aluminum plate joint (rib) and the fixed aluminum plate with bolts; Please refer to the appendix Figure 6 , appendix Figure 6 In the appendix, A, B, and C are respectively: the left protective aluminum plate of the steel triangle, the middle aluminum plate joint, and the right protective aluminum plate of the steel triangle;

[0040] When installing the aluminum plate joint between two steel triangles (i.e., the aluminum plate joint (rib) at high altitude), fix the galvanized screws on the aluminum plate joint in advance on the ground, then weld the galvanized screws to the purlin. Subsequently, after the high-altitude installation of the two steel triangles is completed, carry out the construction. The positions of the aluminum plate joint (rib), fixed aluminum plate, and galvanized screws are shown in the appendix Figure 7 shown in the appendix Figure 7 In the appendix, a and a1 are respectively the fixed aluminum plates on both sides, b is the galvanized hexagon head bolt (specification: M6×25mm); c is the galvanized steel nail (specification: φ12×380mm); d is the aluminum plate joint (rib);

[0041] Step S5: Overall installation: Using the same method, gradually complete the installation of the protective aluminum plates for each layer of the finned cooling tower (a total of 28 steel triangles per layer). After the installation of the single-layer aluminum plates is completed, carry out the hoisting work of the aluminum plates for this layer. The connection form of the aluminum plates between every two adjacent steel triangles is the same as that at the center line of a single steel triangle, and both adopt the connection forms of ridge plates and fixed aluminum plates. The specific operation method is the same as that for the connection of the aluminum plates of a single steel triangle. After all the protective aluminum plates of the lower layer are installed, gradually carry out the installation work of the protective aluminum plates of the upper layer, and then hoist the steel triangles with the installed protective aluminum plates; the connection positions between the protective aluminum plates of each layer adopt the overlapping method of the upper layer pressing the lower layer. According to the design requirements, the overlapping length of the conical section of the steel structure finned cooling tower is 150 mm, and the overlapping length of the cylindrical tower section is 150 mm. Since the connection positions between the conical section and the straight barrel section, and between the upper part of the widened section and the fifth conical section are relatively complex, it is very easy to cause water leakage due to poor sealing during construction. Therefore, integral aluminum plate bending finished parts can be used for on-site installation at this connection part. During installation, only the finished bent aluminum plates need to be directly installed and inserted.

[0042] Furthermore, during on-site installation, it is necessary to focus on controlling the butt joint of the horizontal seams of the wave crests and wave troughs of the protective aluminum plates. The key point is that before the protective aluminum plates of the upper-layer steel triangles are installed on the ground, it is necessary to measure the outer edge spacing L of the wave crests and wave troughs of the aluminum plates installed at high altitude between every two adjacent steel triangles of the lower layer that have been installed, record it, so as to specifically adjust and number the distance L of the middle aluminum plate joints (ribs) of the single steel triangles assembled on the ground of the upper layer. During hoisting, it is necessary to install each single steel triangle added after actual adjustment according to the fixed edge distance of the aluminum plates of each steel triangle in the order of the high-altitude numbers one by one to successfully complete the insertion installation of the aluminum plate joints (ribs) between the upper and lower layers and quickly complete the high-altitude installation.

[0043] Please refer to the appendix Figures 1-3 , in order to ensure that the longitudinal fixing spacing of the self-tapping screws of the built-in protective aluminum plates is 270 mm, at the wave crest position, the transverse fixing spacing is 270 mm, and at the wave trough position, the marking device in step S2 includes an installation frame 1, a fixing component, a bearing seat 4, a screw driving component 5, a longitudinal guide frame 6, a transverse guide frame 7, a connecting slider 8, a measuring driving wheel component 9, a telescopic device one 10, a movable frame 11, a moving part, and a marking component 14;

[0044] The fixing component is arranged on the mounting frame 1 and is used to fix the mounting frame 1 and the aluminum protection board. Before fixing the aluminum protection board to the single-piece steel triangle, first fix the mounting frame 1 on the aluminum protection board through the fixing component. Preferably, the fixing component of this embodiment includes two groups of fixing seats 2, and the two groups of fixing seats 2 are respectively slidably arranged on both sides of the bottom surface of the mounting frame 1. The fixing seat 2 is threadedly sleeved on the outer wall of the first adjusting screw 3, and one end of the first adjusting screw 3 threadedly penetrates the side wall of the mounting frame 1. By manually rotating the first adjusting screw 3, the fixing seat 2 is driven to move relative to the mounting frame 1 to adjust the position of the fixing seat 2, so that the fixing seat 2 contacts the side wall of the aluminum protection board, realizing the fixation of the mounting frame 1 and the aluminum protection board;

[0045] The bearing seat 4 is slidably arranged on the mounting frame 1, and the screw driving component 5 is arranged on the mounting frame 1 and is used to drive the bearing seat 4 to move along the length direction of the mounting frame 1. The screw driving component 5 belongs to the prior art. For example, the screw driving component 5 includes a screw and a rotating device for driving the screw to rotate. The position of the bearing seat 4 on the mounting frame 1 can be adjusted through the screw driving component 5;

[0046] The longitudinal guide frame 6 is arranged on one side of the bearing seat 4 and is perpendicular to the mounting frame 1. The transverse guide frame 7 is perpendicularly arranged outside the longitudinal guide frame 6. One end of the connecting slider 8 is fixed to the middle of the inner cavity of the transverse guide frame 7, and the other end slides in the longitudinal guide frame 6. When the connecting slider 8 moves in the longitudinal guide frame 6, the transverse guide frame 7 is driven to move synchronously; A shaft body is arranged on one side of the connecting slider 8, and a longitudinal through opening 61 for the shaft body to move is opened on the side wall of the longitudinal guide frame 6. A measuring driving wheel assembly 9 is arranged on the outer wall of the shaft body, and the measuring driving wheel assembly 9 is used to contact the outer wall of the aluminum protection board. Through this setting, when the connecting slider 8 moves on the outer wall of the aluminum protection board, the measuring driving wheel assembly 9 rolls relative to the shaft body on the outer wall of the aluminum protection board;

[0047] The first telescopic device 10 is arranged on the longitudinal guide frame 6 and is used to drive the connecting slider 8 to move in the longitudinal guide frame 6. The movable frame 11 is arranged above the transverse guide frame 7 and is driven to move up and down by the measuring driving wheel assembly 9. There are two groups of moving parts, which are respectively slidably arranged at both ends of the inner cavity of the transverse guide frame 7. Marking components 14 are arranged on both the moving parts and the connecting slider 8, and the marking components 14 also penetrate the movable frame 11. Through this setting, when the measuring driving wheel assembly 9 rolls on the outer wall of the aluminum protection board, the movable frame 11 will be driven to move every time the required distance for rolling is reached, so that the movable frame 11 drives the marking components 14 to mark on the aluminum protection board, so as to mark the positions of the self-tapping screws at the wave crests and wave troughs of the aluminum protection board.

[0048] Please refer to the appendix Figures 4-6 Preferably, the measuring driving wheel assembly 9 of this embodiment includes a wheel body 91, a circular ring part 92, an arc-shaped concave opening 93, a top rod 94 and a return spring 95;

[0049] The wheel body 91 is rotatably sleeved on the outer wall of the shaft body through a bearing, so that the wheel body 91 can rotate relative to the shaft body. The annular part 92 is arranged on the outer side wall of the wheel body 91. The arc-shaped concave notch 93 is opened on the circumferential outer wall of the annular part 92. The ejector rod 94 is vertically arranged on one side of the connecting slider 8 through a bracket. One end of the ejector rod 94 is in sliding contact with the outer wall of the annular part 92, and the other end is connected to the movable frame 11. A return spring 95 for driving the ejector rod 94 to reset is arranged on the outer wall of the ejector rod 94. One end of the return spring 95 is connected to the bracket, and the other end is connected to the outer wall of the ejector rod 94. When one end of the ejector rod 94 contacts the inner wall of the bottom of the arc-shaped concave notch 93, one end of the marking assembly 14 contacts the outer wall of the protective aluminum plate. Initially, the ejector rod 94 contacts the circumferential outer wall of the annular part 92. At this time, the marking assembly 14 does not contact the outer wall of the protective aluminum plate. As the wheel body 91 rotates, when the ejector rod 94 contacts the arc-shaped concave notch 93, at this time, under the action of the return spring 95, the ejector rod 94 makes the movable frame 11 move, thereby making the marking assembly 14 contact the outer wall of the protective aluminum plate and leaving a self-tapping screw position mark on the protective aluminum plate.

[0050] Preferably, the measurement driving wheel assembly 9 of this embodiment further includes a fixing ring 96 and a locking tooth 97;

[0051] The fixing ring 96 is arranged on the outer side wall of the wheel body 91 and is coaxial with the wheel body 91. The annular part 92 is movably sleeved on the outer wall of the fixing ring 96. The annular part 92 can rotate relative to the fixing ring 96. The locking tooth 97 is slidably arranged on the outer wall of the annular part 92. A plurality of tooth grooves for inserting one end of the locking tooth 97 are opened on the circumferential outer wall of the fixing ring 96. An elastic member for driving one end of the locking tooth 97 to be in the tooth groove is arranged between the locking tooth 97 and the annular part 92. The elastic member is, for example, a spring. Through this setting, the position of the annular part 92 relative to the wheel body 91 can be adjusted. After the locking tooth 97 is toggled to squeeze the elastic member out of the tooth groove, the annular part 92 is rotated to adjust its position and then the locking tooth 97 is released. The locking tooth 97 is snapped into the tooth groove under the action of the elastic member to fix the annular part 92 and the wheel body 91, so that the annular part 92 can rotate coaxially with the wheel body 91 relative to the ejector rod 94.

[0052] Preferably, the measurement driving wheel assembly 9 of this embodiment further includes a pointing mark 98. The pointing mark 98 is arranged in the arc-shaped concave notch 93 and is inside the ejector rod 94. An annular scale cooperating with the pointing mark 98 is arranged on the outer side wall of the wheel body 91. Through this setting, it is convenient for the user to adjust the spacing of the marks made by the marking assembly 14 on the outer wall of the protective aluminum plate. For example, when the scale value indicated by the pointing mark 98 on the wheel body 91 is N, subsequently, when the wheel body 91 rolls on the outer wall of the protective aluminum plate and the ejector rod 94 enters the arc-shaped concave notch 93, the marking assembly 14 marks on the outer wall of the protective aluminum plate. In this way, the distance between two adjacent marking positions on the outer wall of the protective aluminum plate is N. By adjusting the rotation of the annular part 92 relative to the fixing ring 96, the scale position indicated by the pointing mark 98 on the wheel body 91 can be adjusted.

[0053] Preferably, the moving member in this embodiment includes a follower block 12 and a moving block 13; the follower block 12 is slidably disposed on the movable frame 11, the moving block 13 is slidably disposed on the lateral guide frame 7 and is connected to the follower block 12 through a support rod, and a second telescopic device 15 for driving the moving block 13 to move along the length direction of the movable frame 11 is provided on the side wall of the movable frame 11. Through this setting, it is convenient to adjust the distance between the two moving members. As described above, the marking components 14 in the two moving members correspond to the trough positions of the protection aluminum plate, so that the lateral fixing pitch of the self-tapping screws is 270 mm; a scale parallel to the length direction of the lateral guide frame 7 is provided on the lateral guide frame 7. Through the scale, it is convenient for the user to determine the distance between the marking components 14 in the two moving members.

[0054] Preferably, the marking component 14 in this embodiment includes an adjusting screw rod two 141 and a marking pen 142; the adjusting screw rod two 141 is threadedly inserted into the movable frame 11 or the follower block 12, and through holes for the adjusting screw rod two 141 to extend into are respectively formed through the connecting slider 8 and the moving block 13, and one end of the adjusting screw rod two 141 extends into the through hole and is movably connected to the marking pen 142. The position of the marking pen 142 can be adjusted by rotating the adjusting screw rod two 141; specifically, during use, the marking components 14 in the moving member are adjusted to correspond to the trough positions of the protection aluminum plate, so that the marking components 14 passing through the connecting slider 8 correspond to the peak positions of the protection aluminum plate. When the ejector rod 94 contacts the outer wall of the circular ring portion 92, there is a certain distance between the marking component 14 and the outer wall of the protection aluminum plate. When the ejector rod 94 contacts the arc-shaped concave opening 93, the marking pen 142 in the marking component 14 contacts the outer wall of the protection aluminum plate.

[0055] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A construction method for installing the built-in skin of a steel structure indirect cooling tower, characterized in that: Specifically, it includes the following steps: Step S1: Pre-installation: On the ground, assemble and weld the single-piece steel triangles of the indirect cooling tower. After passing the acceptance, install purlins on the single-piece steel triangles; Step S2: Preliminary positioning: After the purlins are installed, confirm the angles of the purlins in the single-piece steel triangle, and then use a marking device to mark the installation positions of self-tapping screws on the outer wall of the protective aluminum plate that needs to be installed on the purlins. After marking, arrange self-tapping screws at the self-tapping screw installation positions; Step S3: Installation of protective aluminum plates: First, mark the center line from bottom to top as the reference line on the upper part of the purlins of the single-piece steel triangle, arrange the protective aluminum plates evenly from the middle to both sides, and connect the protective aluminum plates on both sides of the reference line, adjacent protective aluminum plates, and protective aluminum plates with unequal widths on both sides in sequence through the self-tapping screws arranged on the protective aluminum plates; Step S4: Installation of aluminum plate joints: Install and fix aluminum plates on the upper parts of the protective aluminum plates on both sides of the reference line, and carry out the installation work of the middle aluminum plate joint at the middle position of the single-piece steel triangle. After the installation of the middle aluminum plate joint is completed, use tools to fix the middle aluminum plate joint and the fixed aluminum plate with bolts; when installing the aluminum plate joint between two steel triangles, pre-fix galvanized screws on the aluminum plate joint on the ground, then weld the galvanized screws to the purlins, and then carry out the construction after the installation of the two steel triangles at high altitude is completed; Step S5: Overall installation: Gradually complete the installation work of the protective aluminum plates of each layer of steel triangles of the indirect cooling tower. After all the lower-layer protective aluminum plates are installed, install the upper-layer protective aluminum plates layer by layer, and then hoist the steel triangles with the installed protective aluminum plates; The marking device in the step S2 includes an installation frame (1), a fixing component, a bearing seat (4), a screw driving component (5), a longitudinal guide frame (6), a transverse guide frame (7), a connecting slider (8), a measuring driving wheel component (9), a telescopic device one (10), a movable frame (11), a moving part, and a marking component (14); The fixed component is arranged on the mounting bracket (1) and is used to fix the mounting bracket (1) to the aluminum protection plate. The bearing seat (4) is slidably arranged on the mounting bracket (1). The screw driving component (5) is arranged on the mounting bracket (1) and is used to drive the bearing seat (4) to move along the length direction of the mounting bracket (1). The longitudinal guide frame (6) is arranged on one side of the bearing seat (4) and is perpendicular to the mounting bracket (1). The transverse guide frame (7) is vertically arranged outside the longitudinal guide frame (6). One end of the connecting slider (8) is fixed in the middle of the inner cavity of the transverse guide frame (7), and the other end slides in the longitudinal guide frame (6). One side of the connecting slider (8) is provided with a shaft body. A longitudinal through hole (61) for the movement of the shaft body is formed in the side wall of the longitudinal guide frame (6). A measuring driving wheel assembly (9) is arranged on the outer wall of the shaft body and is used to contact the outer wall of the aluminum protection plate. The first telescopic device (10) is arranged on the longitudinal guide frame (6) and is used to drive the connecting slider (8) to move in the longitudinal guide frame (6). The movable frame (11) is arranged above the transverse guide frame (7) and is driven to move up and down by the measuring driving wheel assembly (9). There are two groups of moving parts, which are respectively slidably arranged at both ends of the inner cavity of the transverse guide frame (7). Marking components (14) are arranged on both the moving parts and the connecting slider (8), and the marking components (14) are also connected to the movable frame (11).

2. A construction method for installing built-in skin in a steel structure indirect cooling tower according to claim 1, characterized in that: The measuring driving wheel assembly (9) includes a wheel body (91), a circular ring part (92), an arc-shaped concave opening (93), a top rod (94), and a return spring (95); The wheel body (91) is rotatably sleeved on the outer wall of the shaft body. The circular ring part (92) is arranged on the outer side wall of the wheel body (91). The arc-shaped concave opening (93) is formed in the circumferential outer wall of the circular ring part (92). The top rod (94) is vertically arranged on one side of the connecting slider (8) through a bracket. One end of the top rod (94) is in sliding contact with the outer wall of the circular ring part (92), and the other end is connected to the movable frame (11). A return spring (95) for driving the top rod (94) to return is arranged on the outer wall of the top rod (94). When one end of the top rod (94) contacts the bottom inner wall of the arc-shaped concave opening (93), one end of the marking component (14) contacts the outer wall of the aluminum protection plate.

3. A construction method for installing the built-in skin of a steel structure indirect cooling tower according to claim 2, characterized in that: The measuring driving wheel assembly (9) further includes a fixing ring (96) and locking teeth (97); The fixing ring (96) is arranged on the outer side wall of the wheel body (91) and is coaxial with the wheel body (91). The circular ring part (92) is movably sleeved on the outer wall of the fixing ring (96). The locking teeth (97) are slidably arranged on the outer wall of the circular ring part (92). A plurality of tooth grooves for one end of the locking teeth (97) to insert are formed in the circumferential outer wall of the fixing ring (96). An elastic member for driving one end of the locking teeth (97) to be in the tooth groove is arranged between the locking teeth (97) and the circular ring part (92).

4. A construction method for installing the built-in skin of a steel structure indirect cooling tower according to claim 3, characterized in that: The measuring driving wheel assembly (9) further includes a pointing mark (98). The pointing mark (98) is arranged in the arc-shaped concave opening (93) and is inside the top rod (94). A circular scale cooperating with the pointing mark (98) is arranged on the outer side wall of the wheel body (91).

5. A construction method for installing an inner skin of a steel structure indirect cooling tower according to claim 1, characterized in that: The moving member includes a follower block (12) and a moving block (13); the follower block (12) is slidably arranged on the movable frame (11), the moving block (13) is slidably arranged on the lateral guide frame (7) and is connected to the follower block (12) through a support rod, and a second telescopic device (15) for driving the moving block (13) to move along the length direction of the movable frame (11) is arranged on the side wall of the movable frame (11).

6. A construction method for installing the built-in skin of a steel structure indirect cooling tower according to claim 5, characterized in that: The marking assembly (14) includes an adjusting screw rod two (141) and a marking pen (142); the adjusting screw rod two (141) is threadedly inserted into the movable frame (11) or the follower block (12), movable through holes for the adjusting screw rod two (141) to extend into are respectively formed through the connecting slider (8) and the moving block (13), and one end of the adjusting screw rod two (141) extends into the movable through hole and is movably connected to the marking pen (142).

7. A construction method for installing the built-in skin of a steel structure indirect cooling tower according to claim 1, characterized in that: A scale parallel to the length direction of the lateral guide frame (7) is arranged on the lateral guide frame (7).

8. A construction method for installing the built-in skin of a steel structure indirect cooling tower according to claim 1, characterized in that: The fixing assembly includes two groups of fixing seats (2), the two groups of fixing seats (2) are respectively slidably arranged on both sides of the bottom surface of the mounting frame (1), the fixing seats (2) are threadedly sleeved on the outer wall of the adjusting screw rod one (3), and one end of the adjusting screw rod one (3) threadedly penetrates through the side wall of the mounting frame (1).

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