A method for measuring and positioning a tripod for a skin-built-in indirect cooling tower

Abstract

The present invention discloses a method for measuring and positioning a tripod of a skin-built-in intercooler tower, comprising the following steps: Step S1: measuring and positioning the tripod of the tower section of the intercooler tower cone that does not include a built-in skin; Step S2: after the construction of the tripod of the tower section of the intercooler tower cone that does not include a built-in skin is completed, measuring and positioning the tripod of the tower section of the intercooler tower cone that includes a built-in skin, and the tripod of the intercooler tower straight section on the intercooler tower cone; Step S3: during the construction of the intercooler tower straight section, whenever the intercooler tower straight section is constructed to the required height, the reinforcement ring outside the intercooler tower straight section is constructed, and during the construction, the tripod of the reinforcement ring is measured and positioned. This technical solution is divided into three stages, and in each stage, the measurement stations are arranged according to the above technical solution based on the actual situation of the construction site, which can meet the precise positioning measurement of all the tripods of the intercooler tower and achieve efficient, convenient and safe construction requirements.

Description

Technical Field

[0001] The invention relates to the technical field of indirect cooling tower installation, in particular to a method for measuring and positioning a tripod of a skin-built-in indirect cooling tower. Background Art

[0002] A certain project requires the construction of two new "five-tower-in-one" intercooling towers for million-unit units. The skin is internal and the reinforcement ring is external. The core of the intercooling tower is the desulfurization smoke tower, and the air-cooling radiators of the main and auxiliary systems are arranged vertically around the outside of the intercooling tower. The tower body of the intercooling tower is a full steel structure, including a lower cone, a cylindrical tower body, an external reinforcement ring, a widening platform, a tower ladder, and an internal aluminum guard plate. The steel tower is 190.5m high, with a bottom diameter of the lower cone of 127m and a cone height of 61.5m. The diameter of the upper cylindrical tower body is 90m, and the height of the cylindrical tower body is 129m. The intercooling tower is assembled from a tripod, an external reinforcement ring, a widening platform and an internal aluminum guard plate. The tower body is all steel structure. The steel structure of a single tower weighs about 4,200t, and the internal aluminum guard plate of a single tower is about 47,631m. 2 Each layer of tripods has 28 frames. The cone part is composed of 6 layers of tripods (the maximum weight of a single tripod is about 9.6 tons), and the upper cylindrical tower body is composed of 12 layers of tripods (the maximum weight of a single triangle is about 8.6 tons). There are 4 layers of reinforcement rings on the outer surface of the upper cylindrical tower body, and each layer of reinforcement ring has 28 tripods, weighing about 200 tons. The heights of the reinforcement rings are 61.1m, 103.9m, 146.7m, and 178.8m respectively. The built-in aluminum plate of the tower body is sealed by aluminum alloy profiled plate (about 47631m 2 ).

[0003] Because the intercooler tower design features a "five-tower-in-one" structure, with the outer skin built into the cylinder and the reinforcement ring external to the cylinder, and the desulfurization flue gas tower at the center of the tower, it is easy for the tripod to be unable to use the center for measurement and positioning. In addition, the intercooler tower is surrounded by other structures such as the coal handling trestle, circulating water pump room, and acid wastewater tank, which greatly restricts the construction conditions around the intercooler tower, significantly affecting the positioning and measurement of the tripod at different heights. To this end, we propose a measurement and positioning method for the tripod of an intercooler tower with an internal skin. Summary of the Invention

[0004] The object of the present invention is to provide a method for measuring and positioning a tripod of a skin-built-in indirect cooling tower, so as to solve the problems raised in the above-mentioned background technology.

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

[0006] A method for measuring and positioning a tripod of a skin-built-in indirect cooling tower comprises the following steps:

[0007] Step S1: measuring and positioning the tripod of the tower section of the intermediate cooling tower cone that does not include the built-in skin;

[0008] Step S11: When the intercooler cone section is under construction and the desulfurization absorption tower is not under construction yet, the center of the intercooler tower is not covered. The center of the intercooler tower is used as the measuring station, and measurement and positioning are performed based on points P6, P7, and P8 on the inner side of the crossbeam of each tripod of the intercooler cone section;

[0009] Step S12: When the intercooler cone section and the desulfurization absorption tower are installed simultaneously, measurement stations are arranged according to the installation height of the desulfurization absorption tower and the height of the tripod installed on the intercooler cone section, and the measurement and positioning of the tripod on the intercooler cone section are completed through the corresponding measurement stations;

[0010] Step S2: After the construction of the tower section of the intercooling tower cone section that does not include the built-in skin is completed, the tower section tripod of the intercooling tower cone section that includes the built-in skin and the tripod of the intercooling tower straight section on the intercooling tower cone section are measured and positioned on the basis thereof; during positioning, multiple measuring stations are set on the rear axis of each column foot of the corresponding ring base foundation column, and then the corresponding tripod on each layer is measured and positioned using the corresponding measuring stations;

[0011] Step S3: During the construction of the straight section of the intercooling tower, the reinforcement ring on the outside of the straight section of the intercooling tower is constructed every time the straight section of the intercooling tower is constructed to the required height. During the construction, the tripod of the reinforcement ring is measured and positioned; during the positioning, the measuring stations are arranged on the circumference outside the ring base, and the tripods of each layer and each frame of the reinforcement ring are measured and positioned according to the measuring stations at the corresponding positions on the circumference.

[0012] A further improvement is that P6 and P8 in step S11 are control points at both ends of the tripod beam, and P7 is a point on the central axis of the tripod beam.

[0013] A further improvement is that in step S11, the elevation, axis and torsion angle are measured and positioned according to the spatial x / y / z coordinates of three points P6, P7 and P8 on the inner side of the crossbeam of each tripod of the intercooler cone section.

[0014] A further improvement is that in step S12, when the installation height of the desulfurization absorption tower is lower than the height of the tripod installed on the cone section of the intercooler, the measuring station is transferred to the ring base, and at least 28 tower outer ring base measuring stations are set in a circular array at the column foot of each tripod 0.8-1.5m outside the tower center axis, and then the tripod positioning measurement is performed in a 180° direction through the gaps in the tripod. The specific positioning method is the same as step S11.

[0015] A further improvement is that in step S12, when the installation height of the desulfurization absorption tower is higher than the height of the tripod installed on the cone section of the intercooler, at least 7 cone section lifting measurement stations are set on a circle with a diameter of d meters with the center of the tower as the center, and each cone section lifting measurement station is responsible for positioning and measuring 4 tripods.

[0016] A further improvement is that the at least 7 cone segment hoisting measuring stations set in step S12 are respectively set at positions of 0°, 51.4°, 102.8°, 154.3°, 205.7°, 257.1°, and 308.6° on a circle with a diameter of d meters.

[0017] A further improvement is that the measuring station arrangement in step S3 is as follows: outside the intercooling tower, with the tower center as the center, starting from the 0° line, and then with the tower center as the center and a diameter of n meters, at least 7 measuring stations outside the tower are set on the circumference, and each measuring station outside the tower is responsible for positioning 4 tripods.

[0018] A further improvement is that the at least seven off-tower measuring stations set in step S3 are respectively set at positions of 0°, 51.4°, 102.8°, 154.3°, 205.7°, 257.1°, and 308.6° on a circle with a diameter of n meters.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] This technical solution divides the positioning and measurement construction phase of the tripod into three stages. In each stage, the measurement stations are arranged according to the above technical solution based on the actual situation of the construction site, and a measurement control network is established. The specific circular diameters of the measurement stations inside and outside the tower are determined according to the actual design dimensions of the intercooler tower and the horizontal distances to the surrounding structures. This can meet the precise positioning and measurement of all the tripods of the intercooler tower, achieving efficient, convenient and safe construction requirements. It effectively solves the problem of the positioning and measurement of the tripod of the intercooler tower being affected by the surrounding structures, meets the compact construction conditions of the "five-tower-in-one" intercooler tower, and ensures the smooth positioning and measurement of the tripod. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of tower center measurement used in the present invention;

[0022] Figure 2 This is a schematic diagram of a tripod according to the present invention;

[0023] Figure 3 This is a schematic diagram of a measuring station in the first stage of the present invention;

[0024] Figure 4 This is a schematic diagram of the second test site in the present invention;

[0025] Figure 5 This is a schematic diagram of the three measurement sites in this stage of the present invention;

[0026] Figure 6 For the present invention Figure 3 、 Figure 4 and Figure 5 A magnified schematic diagram of the structure in the middle;

[0027] Figure 7 This is a schematic diagram of the arrangement of the cone section hoisting measuring station of the present invention;

[0028] Figure 8 This is a schematic diagram of the layout of the measurement stations outside the tower of the present invention.

[0029] In the figure: 1. Tower center; 2. Ring foundation; 3. Ring foundation measuring station outside the tower; 4. Ring foundation column; 5. Cone section hoisting measuring station; 6. Measuring station outside the tower. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] Example 1

[0032] A method for measuring and positioning a tripod of a skin-built-in indirect cooling tower comprises the following steps:

[0033] Step S1: Measure and locate the tripod of the tower section of the indirect cooling tower cone that does not include an internal skin. It should be noted that the indirect cooling tower cone section is divided into a tower section that includes an internal skin (the skin is installed on the inner side of the tripod in the tower section) and a tower section that does not include an internal skin (the skin is not installed on the inner side of the tripod in the tower section). For example, if the indirect cooling tower cone section has six floors, the tower sections that do not include an internal skin are usually the 1st to 4th floors, and the tower sections that include an internal skin are the 5th to 6th floors.

[0034] Step S11: When the intercooler cone section is under construction and the desulfurization absorption tower is not under construction, the tower core 1 is not covered at this time. The tower core 1 of the intercooler is used as the measuring station, and the elevation, axis and torsion angle are measured and positioned according to the spatial x / y / z coordinates of the three points P6, P7 and P8 on the inner side of the crossbeam of each tripod of the intercooler cone section. See the attached Figure 1 ; Among them, P6 and P8 are the control points at both ends of the tripod beam, and P7 is the point on the central axis of the tripod beam, see the attached Figure 2There are multiple key control points on the tripod installed on the intercooling tower, such as P1-P9. P1 and P2 are control points at the column foot. Before installation, the axis and installation position are marked, and the column foot is initially positioned during installation. P3, P4, and P5 are control points at the center of the beam, which are not convenient for measurement. The upper position is mainly measured and controlled through the three control points P6, P7, and P8. After the initial positioning at the column foot, the coordinates of the three points P6, P7, and P8 on the beam can be controlled to control the aerial posture of the tripod, as well as the elevation, axis, torsion angle, etc., to complete the measurement and positioning construction of the tripod.

[0035] Step S12: When the intercooler cone section and the desulfurization absorption tower are installed simultaneously, the center point of the tower core 1 is blocked after the keel, bottom plate and wall plate of the desulfurization absorption tower are installed. At this time, the center point of the tower core 1 cannot be used for measurement. Therefore, the measuring station needs to be transferred for hoisting measurement control as follows:

[0036] Select the measuring station according to the installation height of the desulfurization absorption tower and the height of the tripod installed in the cone section of the intercooler, and complete the measurement and positioning of the tripod of the cone section of the intercooler through the corresponding measuring station;

[0037] Specifically, when the installation height of the desulfurization absorption tower is lower than the height of the tripod installed on the cone section of the intercooler, the measuring station is transferred to the ring base 2, and at least 28 tower outer ring base measuring stations 3 are arranged in a ring array at a position 0.8-1.5m outside the axis of the tower center 1 of the column foot of each tripod. The at least 28 tower outer ring base measuring stations 3 are all located on the diameter line passing through the center of the circle, so that the tripod positioning measurement of 180° can be conveniently carried out through the gap of the tripod, and the viewing angle is better. The specific positioning method is the same as step S11 (that is, the spatial coordinates of the points on the three tripod beams P6, P7, and P8 are controlled to achieve the control of elevation, axis, torsion angle, etc.); wherein, the ring base 2 refers to the annular foundation of the intercooler, with a relative coordinate of ±0.00 meters. Various types of piers are arranged on the annular panel according to the design, and there are embedded steel plates on the piers. The function of the piers is to install the upper steel structure. The various types of piers are all arranged symmetrically 180° through the tower center.

[0038] If during the installation and construction of the intercooler, when the height of the desulfurization absorption tower is higher than the height of the tripod installed on the cone section of the intercooler, the opposite measuring station set up on the outer ring base 2 of the tower cannot be measured due to line of sight obstruction, then at least 7 cone section hoisting measuring stations 5 are set up on a circle with a diameter of d meters (this circle is located in a safe area outside the construction area of ​​the desulfurization absorption tower) with the tower center 1 as the center. Each cone section hoisting measuring station 5 is responsible for positioning and measuring 4 tripods. When the elevation angle is large, the total station can be equipped with a bent tube eyepiece for observation and measurement; at least 7 cone section hoisting measuring stations 5 are respectively set at 0°, 51.4°, 102.8°, 154.3°, 205.7°, 257.1°, and 308.6° on the circle with a diameter of d meters. A measurement control network is established inside the tower through the at least 7 measuring stations. As the tripod is installed, the measurement control network inside the tower is established. Different locations require different measuring stations for hoisting and positioning measurement to meet the needs of hoisting all tripods. It should be noted that both the diameter d and the diameter n described below are determined based on the actual situation on site. For example, for a circle with a diameter of d meters, when the desulfurization tower in the tower is constructed simultaneously, it is easy to block the line of sight when arranged on the ring base 2. Therefore, 7 measuring stations are established. As long as the purpose of observing points P6, P7, and P8 on the beam can be achieved, it is sufficient. If the total station is equipped with a bent tube eyepiece and there is no angle, then the diameter is too large, but it cannot be too small to enter the construction range of the desulfurization tower, and safety cannot be guaranteed. Therefore, it can basically be within a circular area, as shown in the figure below: d1<d<d2, where A is the installation height of the desulfurization tower; B is the visual measurement line of sight; C is the blocked measurement line of sight; and D is the installation height of the intercooler. At least 7 measuring stations are set up because there are many structures in the tower. The sight of the measuring stations will be blocked by the desulfurization absorption tower and other objects. The observation laser target on the tripod beam installed needs to be installed at different positions. It can be moved within 360° in the tower. Basically, one measuring station can observe 4 tripods.

[0039] Step S2: After the construction of the intercooler cone section that does not include the built-in skin is completed, the tower section tripod of the intercooler cone section that includes the built-in skin and the tripod of the intercooler straight section on the intercooler cone section are measured and positioned on the basis thereof. At this time, the measuring stations set up in the tower cannot be measured through the measuring stations in the tower because the built-in skin blocks the P6, P7, and P8 measuring stations on the tripod; therefore, during positioning, multiple measuring stations are set on the rear axis of each column foot of the corresponding ring base foundation column 4, and the arrangement method is the same as that in step 12 at the installation height of the desulfurization absorption tower. When the height is lower than the tripod installed on the cone section of the intercooler tower, the tripod corresponding to each layer is measured and positioned by setting at least 28 measuring stations. When the elevation angle is large, the total station can be equipped with a bent tube eyepiece for observation and measurement. Among them, the ring base foundation column 4 is designed for the later installation of the pedestal foundation of other structures. The ring base foundation column 4 is located on the concrete bored piles in the ring base 2 and is not easy to sink or move. The measuring station is set on it, and the change and damage of the measuring station can be ignored. It should be noted that the tripod of the straight section of the intercooler tower also has a built-in skin.

[0040] Step S3: During the construction of the intercooling tower straight section, each time the intercooling tower straight section is constructed to the required height, the reinforcement ring on the outside of the intercooling tower straight section is constructed. For example, if the reinforcement ring of the intercooling tower is required to be located at the 6th, 10th, 12th, or 14th floor, the construction of the intercooling tower straight section can be stopped at the 6th floor and the reinforcement ring can be constructed. After the construction, the intercooling tower straight section is continued on the foundation. In this way, the construction of the intercooling tower straight section and multiple layers of reinforcement rings is completed. During construction, the tripod for the reinforcement ring is measured and positioned;

[0041] Since the strengthening ring is arranged outside the straight cylinder section of the indirect cooling tower, although the aerial position projection diameter of the cross beam of the triangular frame of the strengthening ring is smaller than the diameter of the ring foundation 2, due to the smaller horizontal distance and height, it will make the measuring points on the ring foundation 2 unable to be measured even with the elbow eyepiece. Therefore, during positioning, the measuring points are arranged on a suitable circumference outside the ring foundation 2, and the diameter of the circumference is determined according to the height of the indirect cooling tower. The positioning construction of each layer and each bay of the triangular frame of the strengthening ring is carried out according to the measuring points at the corresponding positions. Arrangement method of the measuring points: Outside the indirect cooling tower, with the tower center 1 as the center, starting from the 0° line, at least 7 external tower measuring points 6 are set on the circumference with a diameter of n meters centered on the tower center 1. Each external tower measuring point 6 is responsible for positioning 4 bays of the triangular frame. A suitable distance is selected outward from the edge of the ring foundation 2 (determined specifically according to the height of the indirect cooling tower and the surrounding space) to enclose the measuring points. The position of this measuring point can be adjusted according to the actual situation on site. The purpose is to determine at least 7 measuring points outside the indirect cooling tower, establish an external tower measurement control network, and complete the positioning measurement of each layer and each bay of the triangular frame of the strengthening ring. Among them, the at least 7 external tower measuring points 6 are respectively arranged at the positions of 0°, 51.4°, 102.8°, 154.3°, 205.7°, 257.1°, and 308.6° on the circumference with a diameter of n meters. It should be noted that for the circumference with a diameter of n meters, it is outside the tower, and the elevation angle is larger the closer it is to the ring foundation 2, which may sometimes make it impossible to observe even with the total station equipped with an elbow eyepiece. Therefore, the circumference with a diameter of n meters needs to be set in a slightly larger range. However, there are other buildings in some directions on site, so it cannot be enlarged indefinitely. In fact, the external tower measuring point 6 is still an annular area, and it may be locally farther away. n is a regional value. For example, as shown in Figure 8 That is: d3 < n < d4, where d3 is the minimum measuring station circumference; d4 is the maximum measuring station circumference; E is the straight cylinder section of the indirect cooling tower; F is the first layer inside the skin; G is the last layer of the straight cylinder section of the indirect cooling tower; H is other structures.

[0042] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirits of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for measuring and positioning a tripod of a skin-built-in indirect cooling tower, characterized in that: The following steps are involved: Step S1: measuring and positioning the tripod of the tower section of the intermediate cooling tower cone that does not include the built-in skin; Step S11: When the intercooler cone section is under construction and the desulfurization absorption tower is not under construction, the tower center (1) of the intercooler is not covered. The tower center (1) of the intercooler is used as a measuring station, and measurement and positioning are performed based on the three points P6, P7, and P8 on the inner side of the crossbeam of each tripod of the intercooler cone section; Step S12: When the intercooler cone section and the desulfurization absorption tower are installed simultaneously, measurement stations are arranged according to the installation height of the desulfurization absorption tower and the height of the tripod installed on the intercooler cone section, and the measurement and positioning of the tripod on the intercooler cone section are completed through the corresponding measurement stations; Step S2: After the construction of the tower section of the intercooling tower cone section that does not include the built-in skin is completed, the tower section tripod of the intercooling tower cone section that includes the built-in skin and the tripod of the intercooling tower straight section on the intercooling tower cone section are measured and positioned on the basis thereof; when positioning, multiple measuring stations are set on the rear axis of each column foot of the corresponding ring base foundation column (4), and then the corresponding tripod of each layer is measured and positioned through the corresponding measuring stations; Step S3: During the construction of the intercooling tower straight section, the reinforcement ring outside the intercooling tower straight section is constructed every time the intercooling tower straight section is constructed to the required height. During the construction, the tripod of the reinforcement ring is measured and positioned. During the positioning, the measuring stations are arranged on the circumference outside the ring base (2), and the tripods of each layer and each frame of the reinforcement ring are measured and positioned according to the measuring stations at the corresponding positions on the circumference. In step S11, P6 and P8 are control points at both ends of the tripod beam, and P7 is a point on the central axis of the tripod beam; In the step S12, when the installation height of the desulfurization absorption tower is lower than the height of the tripod installed on the cone section of the intercooler, the measuring station is transferred to the ring base (2), and at least 28 tower outer ring base measuring stations (3) are arranged in a ring array at the column foot of each tripod 0.8-1.5m outside the axis of the tower center (1), and then the tripod positioning measurement is performed in a 180° direction through the gap of the tripod. The specific positioning method is the same as that of step S11; In the step S12, when the installation height of the desulfurization absorption tower is higher than the height of the tripod installed on the cone section of the intercooler, at least seven cone section hoisting measurement stations (5) are set on a circle with a diameter of d meters with the tower center (1) as the center, and each cone section hoisting measurement station (5) is responsible for positioning and measuring four tripods; The arrangement of the measuring stations in step S3 is as follows: outside the intercooling tower, with the tower center (1) as the center, starting from the 0° line, and then with the tower center (1) as the center and a diameter of n meters, at least seven measuring stations (6) outside the tower are arranged, and each measuring station (6) outside the tower is responsible for positioning four tripods.

2. The method for measuring and positioning a tripod for a skin-built-in indirect cooling tower according to claim 1, characterized in that: In the step S11, the elevation, axis and torsion angle are measured and positioned according to the spatial x / y / z coordinates of the three points P6, P7 and P8 on the inner side of the crossbeam of each tripod of the intercooler cone section.

3. The method for measuring and positioning a tripod for a skin-built-in indirect cooling tower according to claim 1, characterized in that: At least seven cone segment hoisting measuring stations (5) set in step S12 are respectively set at positions of 0°, 51.4°, 102.8°, 154.3°, 205.7°, 257.1°, and 308.6° on a circle with a diameter of d meters.

4. The method for measuring and positioning a tripod of a skin-built-in indirect cooling tower according to claim 1, characterized in that: The at least seven off-tower measuring stations (6) set in step S3 are respectively located at positions of 0°, 51.4°, 102.8°, 154.3°, 205.7°, 257.1°, and 308.6° on a circle with a diameter of n meters.

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