Steel anchor box positioning and installation method

Abstract

The present application provides a method for positioning and installing a steel anchor box, wherein the steel anchor box includes a first-section steel anchor box and a normal-section steel anchor box, and includes the following steps: installing a steel pier in a notch reserved at the top of a tower column segment that meets the construction height requirements; hoisting a foundation-section steel wall panel to the steel pier for installation, and adjusting the horizontal position and elevation of the foundation-section steel wall panel through the steel pier, and fixing the foundation-section steel wall panel after the adjustment; hoisting the first-section steel anchor box to the top of the foundation-section steel wall panel, and the first-section steel anchor box and the foundation-section steel wall panel are connected by bolts after positioning; hoisting a single-section normal-section steel anchor box to the top of the first-section steel anchor box as a whole, and the two are aligned and installed according to the positioning pin holes between the upper and lower sections of the steel anchor box wall panels; and repeating the above steps until the installation of the steel anchor box of the cable tower is completed. The present application sets a foundation-section steel wall panel, and the steel pier first levels the foundation-section steel wall panel, and then installs the steel anchor box to the foundation-section steel wall panel. The operation is easy and the adjustment controllability is high.

Description

Technical Field

[0001] The present application relates to the technical field of bridge construction, and in particular to a method for positioning and installing a steel anchor box. Background Art

[0002] In the construction of cable-stayed bridges, the anchoring structure position of the cable at the end of the tower is crucial, which is directly related to the installation position and structural safety of the cable. The anchoring of the cable on the tower is now mostly done in the form of a steel anchor box. The installation and positioning of the steel anchor box is affected by various factors in the tower (the elevation of the top surface of the tower, the axis position, and the compression deformation of the tower during the construction phase). It is usually the key and difficult point of tower construction, especially the installation and positioning of the first section of the steel anchor box. The traditional method of adjusting the accuracy is to use concrete for leveling, and then install the first section of the steel anchor box on the concrete tower segment. However, due to the large size and weight of the first section of the steel anchor box, it will be difficult to adjust its accuracy after installing it on the concrete tower segment. Summary of the invention

[0003] The purpose of the present application is to provide a method for positioning and installing a steel anchor box to solve the problem that the first section of the steel anchor box is large in size and heavy in weight, making it difficult to adjust its position. The method is easy to operate, convenient to adjust, and has high controllability, thereby improving the positioning accuracy of the steel anchor box.

[0004] In order to achieve the above objectives, this application provides the following technical solutions:

[0005] A method for positioning and installing a steel anchor box, wherein the steel anchor box comprises a first section steel anchor box and a normal section steel anchor box, comprising the following steps:

[0006] Install steel piers in the reserved notches at the top of the tower column segments that meet the construction height requirements;

[0007] Lifting the foundation section steel wall panel to the steel pier for installation, and adjusting the horizontal position and elevation of the foundation section steel wall panel through the steel pier, and fixing the foundation section steel wall panel after the adjustment is completed;

[0008] Hoisting the first steel anchor box to the top of the foundation steel wall plate, the first steel anchor box and the foundation steel wall plate are positioned and connected by bolts, and the concrete of the tower column segment is poured;

[0009] Integrally hoist the normal segment steel anchor box of a single section to the top of the first section steel anchor box, and align and install the two according to the positioning pin holes between the wall plates of the upper and lower sections of the steel anchor box;

[0010] Repeat the above steps until the steel anchor box of the cable tower is installed.

[0011] Further configuration: a plurality of steel piers are arranged in the slots reserved at the tops of the tower column segments, the steel piers include embedded steel plates, adjusting screw rods and leveling steel plates, the embedded steel plates are embedded in the concrete at the bottom of the slots, the bottom of the embedded steel plates are provided with anchor bars embedded in the concrete, the bottom of the adjusting screw rods are welded to the embedded steel plates and extend upward, the leveling steel plates are provided with through holes for the adjusting screw rods to pass through, the adjusting screw rods are provided with nuts on both sides of the leveling steel plates to limit and fix the position of the leveling steel plates.

[0012] Further provision: Between the hoisting of the first section of the steel anchor box and the top of the foundation section of the steel wall panel, a spirit level is used to level the leveling steel plate of the steel pier by adjusting the position of the nut, and the elevation difference of the leveling steel plates of the multiple steel piers is controlled within 1 mm.

[0013] Further, the process of lifting the foundation section steel wall plate of the first section steel anchor box to install on the steel pier, and adjusting the plane position and elevation of the foundation section steel wall plate of the first section steel anchor box through the steel pier includes the following steps:

[0014] The foundation section steel wall plate is hoisted to the top of the steel pier at the top of the tower column, and the preset main reinforcement of the tower column is inserted into the reserved hole at the bottom end of the foundation section steel wall plate;

[0015] The elevation of the base section steel wall panel is adjusted by placing iron sheets on the leveling steel plate of the steel pier, and the plane position of the base section steel wall panel is adjusted by pushing the base section steel wall panel on the steel pier by a jack. When the plane position and elevation indexes of the base section steel wall panel meet the requirements, the bottom of the base section steel wall panel is welded and fixed to the leveling steel plate of the steel pier;

[0016] Pour concrete in the reserved notch at the top of the tower column.

[0017] Further arrangement: before lifting the foundation section steel wall panel to the steel pier for installation, a positioning line is engraved on the leveling steel plate of the steel pier, the positioning line is consistent with the baseline on the foundation section steel wall panel, and auxiliary lines and limit plates are set on the leveling steel plate along the outer contour line of the foundation section steel wall panel.

[0018] Further configuration: the first section steel anchor box is hoisted to the top of the foundation section steel wall plate, the first section steel anchor box and the foundation section steel wall plate are positioned and connected by bolts, and the concrete pouring of the tower column segment includes the following steps:

[0019] Lift the first steel anchor box to the top of the foundation steel wall plate, align the positioning pin holes of the two and drive the positioning pins in, measure and remeasure the position of the first steel anchor box, and after the remeasurement of the axis and the height difference of the four corners meet the construction requirements, use the connecting bolts to lock the foundation steel wall plate and the wall plate of the first steel anchor box;

[0020] Insert the main reinforcement of the tower column through the vertical reserved holes of the wall plate of the first section of the steel anchor box, insert the circumferential reinforcement through the horizontal reserved holes on the inner side of the rib plate of the first section of the steel anchor box, and then insert the corbel reinforcement round steel through the reserved holes of the cross beams on the outer side of the wall plate rib plate of the first section of the steel anchor box;

[0021] Install the remaining steel bars of the tower column segment corresponding to the first steel anchor box, synchronize the annular prestressed pipes and steel strands, install the tower column embedded parts and formwork, and pour concrete.

[0022] Further setting: Before hoisting the first section of the steel anchor box, the tower column is monitored, and the accurate plane position of the installation of the first section of the steel anchor box is determined through control analysis, and the pre-lifting value of the installation of the first section of the steel anchor box is calculated and determined.

[0023] Further configuration: when the steel anchor box is installed to a certain height, steel gaskets are used to correct its deviation.

[0024] Further settings: The installation and positioning of the steel anchor box adopts the three-dimensional coordinate method of the total station, and the elevation and flatness of the steel anchor box and its wall panels are measured using a precision level.

[0025] Further settings: The steel anchor box positioning measurement is selected for layout and positioning in the early morning or evening.

[0026] Compared with the prior art, the solution of this application has the following advantages:

[0027] 1. In the steel anchor box positioning and installation method of the present application, a notch is reserved at the top of the tower column segment that meets the construction height requirement, and a leveling steel pier is arranged in the notch to accurately adjust the plane position and elevation of the steel anchor box. Due to the large volume and weight of the first section of the steel anchor box, a foundation section steel wall panel is arranged between the steel pier and the first section of the steel anchor box. The structure of the foundation section steel wall panel is the same as that of the steel anchor box wall panel. The steel pier is first used to level the foundation section steel wall panel, and then the steel anchor box is installed on the foundation section steel wall panel. The operation is light and the adjustment is convenient, and the positioning controllability and precision are high.

[0028] 2. In the steel anchor box positioning and installation method of the present application, the steel pier is composed of a pre-embedded steel plate, an adjusting screw and a leveling steel plate. The structure is simple, and the pre-embedded steel plate is embedded in the tower column concrete, so that the steel pier has sufficient supporting capacity. The leveling steel plate can adjust its elevation along the length direction of the adjusting screw, thereby achieving the purpose of adjusting the elevation of the top surface of the steel pier, and the adjustment method is simple.

[0029] Additional aspects and advantages of the present application will be partially given in the following description, which will become apparent from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0031] Figure 1 This is a process flow chart of the steel anchor box positioning and installation method of this application;

[0032] Figure 2 It is a schematic diagram of the connection between the steel pier and the foundation section steel wall plate in the steel anchor box positioning and installation method of the present application;

[0033] Figure 3 It is a structural schematic diagram of a steel buttress in the steel anchor box positioning and installation method of the present application;

[0034] Figure 4 This is a schematic diagram for illustrating the prepared notch at the top of the tower column in the steel anchor box positioning and installation method of the present application;

[0035] Figure 5 This is a schematic diagram used to illustrate the connection between the foundation section steel wall panel and the first section steel anchor box in the steel anchor box positioning and installation method of the present application.

[0036] In the figure, 1. Steel pier; 11. Embedded steel plate; 12. Adjusting screw rod; 13. Leveling steel plate; 14. Anchor bar; 2. Foundation section steel wall panel; 3. First section steel anchor box; 4. Notch. DETAILED DESCRIPTION

[0037] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be interpreted as limiting the present application.

[0038] See also Figures 1 to 5 In view of the problem that it is difficult to ensure accurate positioning during the current positioning and installation construction of steel anchor boxes, the present application provides a method for positioning and installing steel anchor boxes, which mainly reserves a notch 4 at the top of the tower column segment that has met the construction height requirements, and sets a leveling steel pier 1 in the notch 4 to accurately adjust the plane position and elevation of the steel anchor box, and applies different precision control measures to the positioning of the steel anchor box, so as to effectively improve the installation positioning accuracy of the steel anchor box of the present application.

[0039] It should be noted that the steel anchor box for the tower column construction of this application starts from the upper tower column part of the main tower column. The 11th to 15th sections of the main tower column are the upper tower column section parts, that is, this application starts the steel anchor box at the 11th section of the main tower column. The steel anchor box of a single tower column in this embodiment has a total of 18 sections, and 2 sections of steel anchor boxes are installed for each tower column section. The steel anchor box includes the first section steel anchor box 3 and the normal section steel anchor box. When constructing the 11th section of the tower column, it is necessary to install the basic section steel wall panel 2 and the first section steel anchor box 3. The basic section steel wall panel 2 can directly affect the installation accuracy of the first section steel anchor box 3. When installing the first section steel anchor box 3, it is necessary to focus on pre-controlling the elevation, plane position and relative height difference between the tops of the steel wall panels to provide a basis for the subsequent installation of the normal section steel anchor box.

[0040] In addition, the steel anchor box and foundation section steel wall plate 2 of this embodiment are processed by a professional steel structure factory, and after being pre-assembled and qualified in the factory, they are transported to the construction site by transport vehicles in sections for installation. The foundation section steel wall plate 2 and the steel anchor box need to be measured and marked according to the assembly situation before leaving the factory. After the steel anchor box is transported to the site, it is stored on a planned and leveled site at the main pier position. The steel anchor box is stored with a pad and a cover to avoid collision damage to the steel anchor box.

[0041] The steel anchor box positioning and installation method specifically includes the following construction steps:

[0042] First, a steel buttress 1 is installed on the top of a tower column segment that meets the construction height requirement.

[0043] In this embodiment, a notch 4 is reserved at the top of the 10th tower column segment, and the steel buttress 1 is installed in the notch 4. Figures 2 to 4 The steel pier 1 includes an embedded steel plate 11, an adjusting screw rod 12 and a leveling steel plate 13. The embedded steel plate 11 is embedded in the concrete at the bottom of the slot 4 during the construction of the 10th tower column segment. The bottom of the adjusting screw rod 12 is welded to the embedded steel plate 11, and the adjusting screw rod 12 extends upward. A through hole is provided on the leveling steel plate 13 for the adjusting screw rod 12 to pass through. The adjusting screw rod 12 is provided with nuts on both sides of the leveling steel plate 13 to limit and fix the position of the leveling steel plate 13.

[0044] Preferably, the embedded steel plate 11 and the leveling steel plate 13 are both set to be square, and four adjusting screw rods 12 are set corresponding to the four corner ends of the steel plate. The four adjusting screw rods 12 are used to adjust the elevation of the four corner ends of the leveling steel plate 13, so as to achieve the effect of adjusting the elevation and level of the adjusting steel plate. When adjusting the level of the leveling steel plate 13, a level ruler can be used to assist in leveling, and then the position of the leveling steel plate 13 can be fixed by a nut. The elevation of the adjusting steel plate can be set by setting a measuring point on the top surface of the 10th tower column, and the top surface elevation of the adjusting steel plate can be accurately located by the measuring point.

[0045] Furthermore, the present application supports the base section steel wall panel 2 through steel piers 1, and the top of each tower column is provided with slots 4 on both sides of its transverse center line for supporting two base section steel wall panels 2 respectively, and three steel piers 1 are arranged in each slot 4, which can provide multi-point support for the base section steel wall panel 2 to ensure the stability of the base section steel wall panel 2, and the elevation difference of the leveling steel plates 13 of a total of six steel piers 1 in the two slots 4 is controlled within 1 mm, so that the installation accuracy of the base section steel wall panel 2 can be controlled.

[0046] The bottom side of the embedded steel plate 11 is also connected to an anchor bar 14 embedded in the tower column concrete. The anchor bar 14 is designed in an inverted U shape, and four anchor bars 14 are arranged at the bottom of the embedded steel plate 11 in this embodiment corresponding to its four corner ends to improve the connection strength between the embedded steel plate 11 and the tower column of the present application, and ensure the structural stability of the steel pier 1.

[0047] At the same time, the embedded steel plate 11 and the leveling steel plate 13 are correspondingly provided with through holes for the main reinforcement inside the tower column to pass through, so as to facilitate the connection of the main reinforcement inside the main tower column with the foundation section steel wall plate 2 installed on the steel pier 1.

[0048] In addition, the diameter of the through hole is larger than the diameter of the adjusting screw rod 12. The diameter of the through hole in this embodiment is preferably 60 mm, so as to facilitate vibration during the subsequent pouring of concrete in the groove 4 to ensure that the concrete under the steel plate is dense.

[0049] In addition, the top surface of the leveling steel plate 13 needs to be fine-milled to ensure that the top surface of the leveling steel plate 13 used to connect with the base section steel wall panel 2 is flat, thereby reducing the error in the elevation or plane position of the base section steel wall panel 2 caused by the uneven top surface of the leveling steel plate 13, thereby affecting the connection accuracy of subsequent steel wall panels.

[0050] Subsequently, the foundation section steel wall panel 2 is hoisted and installed on the steel pier 1, and the plane position and elevation of the foundation section steel wall panel 2 are adjusted. After the adjustment is completed, the foundation section steel wall panel 2 is fixed.

[0051] Specifically, before lifting the foundation section steel wall panel 2 to be installed on the steel pier 1, a positioning line is engraved on the leveling steel plate 13 of the steel pier 1. The positioning line is a vertical and horizontal cross baseline, which is consistent with the baseline on the foundation section steel wall panel 2. At the same time, auxiliary lines are set on the leveling steel plate 13 along the outer contour line of the foundation section steel wall panel 2, and a limit plate is set.

[0052] The installation of the foundation section steel wall panel 2 is carried out after the concrete pouring of the 10th section tower column is completed and the rigid frame of the 11th section tower column is connected and in place. In this embodiment, an I25 steel composite truss type hoist is used to lift the foundation section steel wall panel 2. Since the foundation section steel wall panel 2 is set in two sections, a temporary truss can be used to connect the two sections of the foundation section steel wall panel 2 as a whole and then hoist the whole section onto the steel pier 1. The lifting point is set on the vertical rib plate of the foundation section steel wall panel 2, and a matching node plate is used and fixed with bolts.

[0053] Lift the foundation section steel wall panel 2 to the top position of the 10th tower column segment, insert the main reinforcement inside the tower column into the reserved hole at the bottom end of the foundation section steel wall panel 2, let the foundation section steel wall panel 2 fall on the leveling steel plate 13 of the steel pier 1, and adjust the position of the foundation section steel wall panel 2. When adjusting the foundation section steel wall panel 2, on the premise that the processing accuracy of the foundation section steel wall panel 2 and the installation accuracy of the steel pier 1 meet the requirements, first measure whether the elevation difference of the four corners of the foundation section steel wall panel 2 meets the accuracy requirements. If not, it is necessary to adjust the height position of the foundation section steel wall panel 2 first. Specifically, the top surface of the leveling steel plate 13 of the steel pier 1 can be adjusted with a 0.2mm thick iron sheet for elevation adjustment. If the elevation of the four corners of the foundation section steel wall panel 2 meets the accuracy requirements, the plane position can be adjusted. In this embodiment, a jack is used to push the foundation section steel wall panel 2 to slide on the leveling steel plate 13 of the steel pier 1, thereby achieving the purpose of adjusting the plane of the foundation section steel wall panel 2. At the same time, before the installation of the foundation section steel wall panel 2 , the baseline and auxiliary lines pre-engraved on the steel pier 1 , as well as the set limit plates can play an auxiliary positioning role in the plane position adjustment of the foundation section steel wall panel 2 .

[0054] Since steel is sensitive to temperature changes, the adjustment of the plane position and elevation of the above-mentioned foundation-section steel wall panel 2 can be carried out after sunset. Measuring the foundation-section steel wall panel 2 after sunset can allow the foundation-section steel wall panel 2 and the tower column to have sufficient time to equalize the temperature, thereby avoiding deformation of the steel caused by excessively high or low temperatures and resulting in measured temperature differences.

[0055] The installation accuracy requirements for measuring the foundation section steel wall panel 2 include the following technical indicators: positioning deviation of the baseline in the longitudinal direction of the bridge, position deviation of the baseline in the transverse direction of the bridge, opening deviation of the baseline, deviation of the top measuring point along the bridge, and deviation of the top measuring point in the transverse direction of the bridge. Among them, the allowable deviation of the positioning of the baseline in the longitudinal direction of the bridge is ±5.0mm, the allowable deviation of the position of the baseline in the transverse direction of the bridge is ±3.0mm, the allowable deviation of the opening of the baseline is ±3.0mm, the allowable deviation of the elevation of the top measuring point along the bridge is 1.5mm, and the allowable deviation of the elevation of the top measuring point in the transverse direction of the bridge is 2.0mm.

[0056] When the above technical indicators meet the requirements, the foundation section steel wall panel 2 can be welded and fixed to the steel pier 1. Specifically, the bottom of the foundation section steel wall panel 2 is welded to the leveling steel plate 13 of the steel pier 1. When welding and fixing, the four corner ends of the foundation section steel wall panel 2 need to be fixed synchronously to ensure the plane position and elevation of the foundation section steel wall panel 2. At the same time, the foundation section steel wall panel 2 is also connected to the rigid skeleton of the tower column. In particular, the foundation section steel wall panel 2 is inclined toward one side of the axis of the cross bridge. Then, a diagonal brace is added to the foundation section steel wall panel 2 upward at the cross bridge at the top of the tower column. One end of the diagonal brace is used to support the steel wall panel, and the other end is supported on the rigid skeleton of the tower column concrete to increase the support strength of the foundation section steel wall panel 2. The diagonal brace preferably uses I22a steel.

[0057] After the plane position and elevation of the foundation section steel wall panel 2 meet the requirements, pour the concrete at the reserved notch 4 on the top of the tower column to ensure that the bottom of the foundation section steel wall panel 2 has sufficient supporting force.

[0058] After the concrete at the notch 4 reaches a certain strength, the first steel anchor box 3 is installed. That is, the first steel anchor box 3 is hoisted to the top of the base section steel wall plate 2, and the first steel anchor box 3 and the base section steel wall plate 2 are positioned and connected by bolts, and the concrete of the tower column segment is poured.

[0059] Specifically, the first section steel anchor box 3 is hoisted to the top of the foundation section steel wall panel 2, the bottom of the first section steel anchor box 3 wall panel is connected to the top of the foundation section steel wall panel 2, the positioning pin holes of the two are aligned and the positioning pins are inserted, and the connecting bolts are set to lock the foundation section steel wall panel 2 and the first section steel anchor box 3. The position of the first section steel anchor box 3 is measured and re-measured, and after the re-measurement of its axis and the height difference of the four corners meet the construction requirements, the wall panels of the foundation section steel wall panel 2 and the first section steel anchor box 3 are locked with connecting bolts to fix the two.

[0060] Before installing the first section of the steel anchor box 3, the tower column needs to be monitored, and the accurate plane position of the first section of the steel anchor box 3 installation is determined through control analysis, and the pre-elevation value of the first section installation is calculated and determined. The ideal target geometric linearity of the steel anchor box is given by the center point of the steel anchor box section, and the center line of the steel anchor box overlaps with the center line of the upper tower column concrete section.

[0061] After the foundation section steel wall plate 2 is fixed to the first section steel anchor box 3, the main reinforcement and circumferential stirrups of the tower column are inserted into the vertical reserved holes of the steel anchor box wall plate and the transverse reserved holes on the inner side of the rib plate, and then the corbel reinforcement round steel is inserted into the transverse reserved holes on the outer side of the rib plate of the steel anchor box wall plate. At the same time, the remaining steel bars of the 11th section of the tower column are installed, as well as the circumferential prestressed pipes and steel strands, the concrete formwork is installed, and the concrete of the 11th section of the tower column is poured. The height of the poured concrete must be lower than the top surface height of the first section steel anchor box 3, so that the normal section steel anchor box to be hoisted later can be connected with the first section steel anchor box 3. After the concrete reaches a certain strength, the next tower column section can be constructed in a cycle.

[0062] The normal segment steel anchor box of a single section is hoisted as a whole to the top of the first section steel anchor box 3, and the two are installed in alignment according to the positioning structure between the upper and lower sections of the steel anchor box wall panels.

[0063] Normal segment steel anchor boxes are installed by single-section integral lifting. The docking method of two adjacent steel anchor boxes is based on the positioning pin holes set between the upper and lower steel anchor box wall panels, and is fixed by bolt connection. The docking method is the same as the docking method between the first steel anchor box 3 and the foundation steel wall panel 2, and the elevation and plane position of the anchoring points of the two adjacent steel anchor boxes are the same as those of the pre-assembled segments, and the design requirements can be met without too much adjustment.

[0064] In this embodiment, the standard segment height of the tower column segment is 4.5m. Considering the installation influence of the steel anchor box, the height of the 13th segment is 4.4m, and the height of the 14th segment is 4.0m. Therefore, for every 2 steel anchor boxes installed, 1 tower column segment is constructed.

[0065] In addition, due to limited installation conditions, when the accumulated inclination trend and elevation exceeding limit of several consecutive segments of steel anchor boxes need to be adjusted, the wall panel height is machined and trimmed in the factory according to the processing method of the pre-assembly stage. The ideal elevation target value for the installation of the steel anchor box in this application is the design elevation plus the following correction values: compensation for the compression of the middle and lower tower columns when the bridge is completed, the superelevation value used when the first section of the steel anchor box 3 was installed; compensation for the overlength of the steel anchor box when the bridge is completed; the settlement of the tower column foundation; the compression of the steel anchor box during the construction stage, etc.

[0066] However, due to the deviation of the inclination of the steel anchor box during its manufacture and installation, as the steel anchor box is continuously raised, the deviation gradually accumulates and increases, and the cumulative deviation of the steel anchor box installation must be controlled. When the steel anchor box is installed to a certain height, deviation correction is required. The deviation correction is performed by inserting steel gaskets between two adjacent steel anchor boxes to adjust the inclination.

[0067] In addition, the positioning measurement of the steel anchor box in this application is usually selected for setting out and positioning in the early morning or evening, when the temperature is relatively stable, and the influence of the external environment on the measurement results is eliminated as much as possible. When each section of the steel anchor box is installed and positioned, its relative position and respective plane position and elevation must be strictly controlled and re-measured. The main measurement parameters of the steel anchor box include: the position of the beam axis in the transverse direction of the bridge, the position of the anchor point in the transverse direction of the bridge, the position of the anchor point in the longitudinal direction of the bridge, the top surface elevation, the verticality of the centerline of the steel anchor box wall panel, the centerline position of the steel anchor box wall panel, and the misalignment between the upper and lower adjacent steel anchor box wall panels. Among them, the allowable deviation of the beam axis in the transverse direction of the bridge is ±5.0mm, the allowable deviation of the anchor point position in the transverse direction of the bridge is ±5.0mm, the allowable deviation of the anchor point position in the longitudinal direction of the bridge is ±5.0mm, the allowable deviation of the top surface elevation is ±2.0mm, the allowable deviation of the verticality of the center line of the steel anchor box siding is 1 / 3000, the allowable deviation between the center line of the steel anchor box siding and the center line of the tower column is ±2.0mm, and the misalignment of adjacent upper and lower steel sidings is ≤0.5mm.

[0068] The installation and positioning of the steel anchor box in this application adopts the three-dimensional coordinate method of the total station, and the elevation and flatness of the steel anchor box and steel wall panel are measured using a precision level.

[0069] Finally, the above steps are repeated until the steel anchor box of the cable tower is installed.

[0070] The steel anchor box positioning and installation method of the present application accurately adjusts the plane position and elevation of the steel anchor box by reserving a notch 4 at the top of the tower column segment that meets the construction height requirements and setting a steel pier 1 in the notch 4. A foundation section steel wall plate 2 is set between the steel pier 1 and the first section steel anchor box 3. The structure of the foundation section steel wall plate 2 is the same as that of the wall plates on both sides of the steel anchor box. The structure of the foundation section steel wall plate 2 is simpler and lighter, which can facilitate workers to adjust its elevation and plane position to ensure the installation accuracy of the subsequent steel anchor box.

[0071] The above description is only a partial implementation method of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A method for positioning and installing a steel anchor box, wherein the steel anchor box comprises a first section steel anchor box and a normal section steel anchor box, characterized in that: The following steps are involved: Install steel piers in the reserved notches at the top of the tower column segments that meet the construction height requirements; The steel wall panel of the lifting foundation section is installed on the steel pier. A plurality of steel piers are arranged in the notches reserved at the top of the tower column segment. The steel pier includes a pre-embedded steel plate, an adjusting screw and a leveling steel plate. The pre-embedded steel plate is pre-embedded in the concrete at the bottom of the notch. An anchor bar embedded in the concrete is arranged at the bottom of the pre-embedded steel plate. The bottom of the adjusting screw is welded to the pre-embedded steel plate and extends upward. A through hole for the adjusting screw to pass through is opened on the leveling steel plate. The adjusting screw is provided with nuts on both sides of the leveling steel plate to limit and fix the position of the leveling steel plate. The foundation section steel wall panel is hoisted to be installed above the steel pier at the top of the tower column, and the preset main reinforcement of the tower column is inserted into the reserved hole at the bottom end of the foundation section steel wall panel. The elevation of the foundation section steel wall panel is adjusted by padding the iron sheet on the leveling steel plate of the steel pier. The foundation section steel wall panel is pushed by a jack to slide on the steel pier to adjust the plane position of the foundation section steel wall panel. When the plane position and elevation index of the foundation section steel wall panel meet the requirements, the bottom of the foundation section steel wall panel is welded and fixed to the leveling steel plate of the steel pier, and concrete is poured at the reserved notch at the top of the tower column to fix the foundation section steel wall panel; Before hoisting the first steel anchor box to the top of the foundation steel wall panel, use a level ruler and adjust the position of the nut to level the leveling steel plate of the steel pier, and the elevation difference of the leveling steel plates of the steel piers is controlled within 1mm. Hoist the first steel anchor box to the top of the foundation steel wall panel, and after positioning the first steel anchor box and the foundation steel wall panel, connect them by bolts, and pour the concrete of the tower column segment; Integrally hoist the normal segment steel anchor box of a single section to the top of the first section steel anchor box, and align and install the two according to the positioning pin holes between the wall plates of the upper and lower sections of the steel anchor box; Repeat the above steps until the steel anchor box of the cable tower is installed.

2. The method for positioning and installing a steel anchor box according to claim 1, characterized in that: Before lifting the foundation section steel wall panel to install on the steel pier, a positioning line is engraved on the leveling steel plate of the steel pier. The positioning line is consistent with the baseline on the foundation section steel wall panel, and auxiliary lines and limit plates are set on the leveling steel plate along the outer contour line of the foundation section steel wall panel.

3. The method for positioning and installing a steel anchor box according to claim 1, characterized in that: The first section steel anchor box is hoisted to the top of the foundation section steel wall plate, the first section steel anchor box and the foundation section steel wall plate are positioned and connected by bolts, and the concrete of the tower column segment is poured, which includes the following steps: Lift the first steel anchor box to the top of the foundation steel wall plate, align the positioning pin holes of the two and drive the positioning pins in, measure and remeasure the position of the first steel anchor box, and after the remeasurement of the axis and the height difference of the four corners meet the construction requirements, use the connecting bolts to lock the wall plate of the foundation steel wall plate and the first steel anchor box; Insert the main reinforcement of the tower column through the vertical reserved holes of the wall plate of the first section of the steel anchor box, insert the circumferential reinforcement through the horizontal reserved holes on the inner side of the rib plate of the first section of the steel anchor box, and then insert the corbel reinforcement round steel through the reserved holes of the cross beams on the outer side of the wall plate rib plate of the first section of the steel anchor box; Install the remaining steel bars of the tower column segment corresponding to the first steel anchor box, synchronize the annular prestressed pipes and steel strands, install the tower column embedded parts and formwork, and pour concrete.

4. The method for positioning and installing a steel anchor box according to claim 3, characterized in that: Before hoisting the first steel anchor box section, the tower column is monitored, and the accurate plane position of the first steel anchor box installation section is determined through control analysis, and the pre-lifting value of the first steel anchor box installation section is calculated and determined.

5. The method for positioning and installing a steel anchor box according to claim 1, characterized in that: When the steel anchor box is installed to a certain height, steel gaskets are used to correct its deviation.

6. The method for positioning and installing a steel anchor box according to claim 1, characterized in that: The installation and positioning of the steel anchor box adopts the three-dimensional coordinate method of the total station, and the elevation and flatness of the steel anchor box and its wall panels are measured using a precision level.

7. The method for positioning and installing a steel anchor box according to claim 6, characterized in that: The steel anchor box positioning measurement is selected for positioning in the early morning or evening.

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