A method for installing a steel pipe combined tower flange tower foot bolt embedded misalignment correction

Abstract

The application discloses a kind of steel pipe combination tower flange tower foot plate foundation bolt pre-buried misalignment rectification installation method, comprising: the information of misaligned installed foundation bolt is measured;The information is introduced into the tower calculation model to redesign flange tower foot plate, so that the screw hole on the flange tower foot plate corresponds to the installed foundation bolt one by one, and the performance index of the flange tower foot plate meets the design requirement;Before installation, first leveling treatment is carried out on the top surface of foundation, and the flange tower foot plate is installed on the top surface of foundation and is in contact with the top surface of foundation dense;According to the requirement, the tower leg main material of steel pipe combination tower and tower leg inclined material are installed on the flange tower foot plate.The specification, model and angle of the installed foundation bolt are positioned, introduced into the tower calculation model, the flange tower foot plate is recalculation and processing, on the basis of ensuring that the foundation is not damaged and reworked and fully utilizing the pre-buried installed foundation bolt, the installation and fixation of tower leg and tower foot plate are restored.

Description

Technical Field

[0001] This invention relates to the field of design technology for the connection between steel pipe composite towers and foundations, specifically to a method for correcting misalignment of pre-embedded anchor bolts on flange-type tower feet of steel pipe composite towers. Background Technology

[0002] With the rapid growth of my country's national economy, the country's investment in the power grid has been increasing, and power construction has been continuously upgraded. In recent years, a large number of new transmission line towers have been built. Among them, steel pipe composite towers are extremely important tall structures for power transmission, and their safety is related to the safety of the entire power grid. The connection between steel pipe composite towers and the foundation is usually made by pre-embedded anchor bolts. Generally, the anchor bolts are first fixed to the foundation reinforcement or formwork, and then concrete is poured in place. Due to the large weight of the anchor bolts and the low rigidity of the foundation reinforcement or formwork, swaying is very likely to occur during construction. When concrete is poured or other external loads are applied, the anchor bolts are prone to displacement or floating, resulting in misalignment of the pre-embedded bolts. Or, because the construction unit does not process and install the anchor bolts according to the design drawings, and the openings of the welded flanges of the steel pipe composite tower body are prefabricated by the tower factory, the pre-embedded anchor bolts cannot be installed in the original position with the flanges of the steel pipe composite tower foot after the concrete has solidified. If traditional measures such as scrapping the foundation or tower displacement are used, it is necessary to redo the excavation of the foundation pit and the pouring of the foundation, which is time-consuming, labor-intensive, and causes significant economic losses. Summary of the Invention

[0003] Based on the above, the present invention provides a method for correcting misalignment of pre-embedded anchor bolts on the flange-type tower foot plate of a steel pipe composite tower, in order to solve the problem that the pre-embedded anchor bolts cannot be installed in the original position with the tower foot flange of the steel pipe composite tower after the foundation concrete has solidified due to incorrect specifications, dimensions, positions and angles of the pre-embedded anchor bolts during on-site construction.

[0004] The technical solution of this invention is: a method for correcting misalignment of anchor bolts in the pre-embedded foundation of a steel pipe composite tower flange-type tower foot plate, comprising the following steps:

[0005] Information on misaligned installed anchor bolts, including specifications, location, and offset angle;

[0006] The information was imported into the tower calculation model to redesign the flange-type tower foot plate, so that the bolt holes on the flange-type tower foot plate correspond one-to-one with the installed anchor bolts, and the performance indicators of the flange-type tower foot plate meet the design requirements.

[0007] Before installation, the top surface of the foundation should be leveled, and the flange-type tower foot plate should be installed on the top surface of the foundation and made to make tight contact with the top surface of the foundation.

[0008] Install the main tower leg material and diagonal bracing of the steel pipe composite tower on the flanged tower foot plate as required.

[0009] As a further improvement of the present invention, the flange-type tower foot plate includes a tower foot plate base plate, a main connecting plate and a stiffening plate. The tower foot plate base plate is provided with screw holes. The main connecting plate and the stiffening plate are welded to the tower foot plate base plate. The main tower leg is welded to the main connecting plate and the stiffening plate. The tower leg diagonal member is bolted to the main connecting plate.

[0010] As a further improvement of the present invention, when designing flange-type tower foot plates, if the anchor bolts and the main connecting plate do not overlap, the original stiffening plate position is adjusted according to the calculation results.

[0011] As a further improvement of the present invention, when designing the flange-type tower leg plate, if the anchor bolts overlap with the main connecting plate, the main connecting plate is chamfered to reserve the position of the anchor bolts, and two stiffening plates are added. The position of the stiffening plates is adjusted according to the calculation results, and the vertical weld length between the main connecting plate and the main tower leg material is guaranteed according to the design requirements.

[0012] As a further improvement of the present invention, the performance indicators include bending strength, shear strength, tensile strength and compressive strength, and the flange-type tower foot plate is calculated and designed according to the specification requirements.

[0013] The beneficial effects of this invention are as follows: This invention solves the problem that the pre-embedded anchor bolts cannot be installed in situ with the steel pipe composite tower after the foundation concrete has solidified due to incorrect specifications, dimensions, positions, and angles of the pre-embedded anchor bolts during on-site construction. It makes full use of the already poured foundation and the pre-embedded anchor bolts, and redesigns and processes the flange-type tower foot plates based on on-site measurement data, avoiding uncertainties such as construction errors and rework periods, and achieving rapid on-site installation and fixing. This greatly improves the efficiency of technical rectification, further enhances the quality and acceptance efficiency of the finished tower construction, and has high safety, reliability, and economy.

[0014] Compared with the prior art, the advantages of this utility model are:

[0015] 1. This invention makes full use of the already poured foundation and the pre-embedded anchor bolts, and achieves rapid on-site installation and fixing by redesigning and processing flange-type tower feet, which greatly improves the efficiency of technical rectification.

[0016] 2. This invention abandons the traditional and commonly used measures of scrapping foundations or shifting tower positions, avoiding more uncertainties brought about by rework, and has extremely high practicality and economy.

[0017] 3. This invention repositions and processes the tower based on actual on-site measurement data, avoiding construction errors caused by the base of the tower, which helps improve the quality of the finished tower construction and the efficiency of acceptance.

[0018] 4. This invention can solve the problem of in-situ installation caused by incorrect specifications, dimensions, position and angle of pre-embedded anchor bolts, etc., and has strong operability and scalability.

[0019] 5. The present invention relates to components that are all standardized and molded, allowing for quick and convenient on-site installation, and possessing high safety, reliability, and economy. Attached Figure Description

[0020] Figure 1 This is a plan of the tower site layout;

[0021] Figure 2 This is the layout plan of the tower base's front elevation.

[0022] Figure 3 Plan view of the tower foot plate;

[0023] Figure 4 This is a schematic diagram of the anchor bolt connection;

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Main tower leg material; 2. Diagonal tower leg material; 3. Base plate of tower leg; 4. Main connecting plate; 5. Stiffening plate; 6. Anchor bolts; 7. Nuts; 8. Pads. Detailed Implementation

[0026] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0027] Please see Figures 1 to 4 This embodiment describes a method for correcting misaligned anchor bolts on the flange-type tower foot plate of a steel pipe composite tower, comprising the following steps:

[0028] S1, Measure the information of the misaligned installed anchor bolts 6, including specifications, location and offset angle;

[0029] Specifically, based on site conditions, the tower site layout plan was measured using tools such as vernier calipers and upper positioning plates, including information such as foundation root opening, foundation dimensions, elevation, anchor bolt specifications, and positioning deviation. In the diagram, the main material 1 of the steel pipe composite tower leg is a circular steel pipe, and the inclined material 2 of the tower leg is an equilateral angle steel, using welding and bolt connections.

[0030] S2, import the information into the tower calculation model and redesign the flange-type tower foot plate so that the screw holes on the flange-type tower foot plate correspond one-to-one with the installed anchor bolts 6, and the performance indicators of the flange-type tower foot plate meet the design requirements.

[0031] In this field, the steel pipe composite tower is calculated based on the tower calculation model. The flange-type tower foot plate is redesigned and manufactured based on measured data input into the tower calculation model. The performance indicators of the flange-type tower foot plate include bending strength, shear strength, tensile strength, and compressive strength. The flange-type tower foot plate includes a base plate 3, a main connecting plate 4, and stiffening plates 5. The base plate 3 has bolt holes, and the main connecting plate 4 and stiffening plates 5 are welded to the base plate 3. When the anchor bolts 6 do not overlap with the main connecting plate 4, the position of the original stiffening plates 5 is adjusted according to the calculation results. When the anchor bolts 6 overlap with the main connecting plate 4, the main connecting plate 4 is chamfered to reserve space for the anchor bolts 6, and two additional stiffening plates 5 are added. The position of the stiffening plates 5 is adjusted according to the calculation results so that the anchor bolts 6 and the main connecting plate 4 no longer overlap, and the length of the vertical weld seam (the weld seam between the main pipe and the tower leg of the steel pipe composite tower) of the main connecting plate 4 is guaranteed according to design requirements. The tower foot plate 3, main connecting plate 4, and stiffening plate 5 are uniformly welded and formed by the iron tower factory.

[0032] S3. Before installation, the top surface of the foundation should be leveled, and the flange-type tower foot plate should be installed on the top surface of the foundation and made to make tight contact with the top surface of the foundation.

[0033] Before installing the flange-type tower foot plate, the top surface of the foundation must be leveled. When the tower type is pre-offset, the top surfaces of the four foundations should be smoothed into slopes of the same direction and angle to ensure a tight contact between the tower foot plate and the top surface of the foundation. The flange base plate should correspond to the positioning plate on site and be installed on the top surface of the foundation, and installed in place with the pre-embedded anchor bolts 6. The spacer block 8 is used between the anchor bolt 6 and the nut 7 and the bottom plate of the tower foot plate. Its specifications and dimensions are affected by components such as the main connecting plate 4 and the stiffening plate 5, and should be based on the on-site layout. The flange-type tower foot plate is anchored to the concrete foundation by the anchor bolts 6. In this embodiment, the flange-type tower foot plate is designed to be connected by twelve anchor bolts 6. Due to construction errors, the twelve pre-embedded anchor bolts 6 on site were misaligned.

[0034] S4, Install the main tower leg material 1 and the inclined tower leg material 2 of the steel pipe composite tower on the flanged tower foot plate as required.

[0035] The main connecting plate 4 and stiffening plate 5 are welded to the main tower leg member 1. The main connecting plate 4 and the diagonal member 2 of the tower leg are installed on-site with bolts. According to the actual position of the anchor bolts 6 and the rotation angle data of the upper positioning plate, the flange-type tower leg base plate 3 and the main tower leg member 1 are welded and installed. It should be noted that the tower leg plate should be flat, smooth, free of burrs and cracks. The inclination angle of the main connecting plate 4 on the base plate 3 should be accurate, and there should be no gaps when connecting it to the main tower leg member 1 and the diagonal member 2. The stiffening plate 5 is welded to the main tower leg pipe and the flange base plate of the steel pipe composite tower, respectively, and meets the weld design grade requirements. Before starting the stringing, loosen the nuts 7 one by one in the gaps between the anchor bolt holes 6 and the bolts in the base plate 3, fill the gaps with M20 cement mortar, cover with shims 8, tighten the nuts 7, and ensure that the bolts are either protruding or flush after the nuts 7 are installed.

[0036] In this embodiment, the tower foot plate 3, main connecting plate 4, and stiffening plate 5 are all custom-made and welded together. They are installed on-site by bolts, which makes the installation operation convenient and effective, greatly shortens the construction period, improves production efficiency, and ensures the quality of finished products, resulting in good economic benefits.

[0037] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A method for correcting misalignment of anchor bolts pre-embedded in flange-type tower feet of a steel pipe composite tower, characterized in that... Includes the following steps: Information on misaligned installed anchor bolts (6) is measured, including specifications, location, and offset angle; The information is imported into the tower calculation model to redesign the flange-type tower foot plate, so that the screw holes on the flange-type tower foot plate correspond one-to-one with the installed anchor bolts (6), and the performance indicators of the flange-type tower foot plate meet the design requirements; when designing the flange-type tower foot plate, if the anchor bolts (6) and the main connecting plate (4) do not overlap, the position of the original stiffening plate (5) is adjusted according to the calculation results; when the anchor bolts (6) and the main connecting plate (4) overlap, the main connecting plate (4) is chamfered to reserve the position of the anchor bolts (6), and two additional stiffening plates (5) are added. The position of the stiffening plates (5) is adjusted according to the calculation results, and the vertical weld length between the main connecting plate (4) and the main material (1) of the tower leg is guaranteed according to the design requirements; Before installation, the top surface of the foundation should be leveled, and the flange-type tower foot plate should be installed on the top surface of the foundation and made to make tight contact with the top surface of the foundation. Install the main tower leg material (1) and inclined tower leg material (2) on the flanged tower foot plate as required.

2. The method for correcting misalignment of anchor bolts in the flange-type tower foot plate of a steel pipe composite tower according to claim 1, characterized in that, The flange-type tower foot plate includes a tower foot plate base plate (3), a main connecting plate (4), and a stiffening plate (5). The tower foot plate base plate (3) has screw holes. The main connecting plate (4) and the stiffening plate (5) are welded to the tower foot plate base plate (3). The tower leg main material (1) is welded to the main connecting plate (4) and the stiffening plate (5). The tower leg inclined material (2) is bolted to the main connecting plate (4).

3. The method for correcting misalignment of anchor bolts in the flange-type tower foot plate of a steel pipe composite tower according to claim 1, characterized in that, The performance indicators include bending strength, shear strength, tensile strength and compressive strength. The flange-type tower foot plate is calculated and designed according to the specifications.

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