Construction method of box-type transformer foundation in sandy soil area with rich water area

Abstract

The application is a construction method of box-type transformer foundation in sandy soil area with rich water area; the equipment foundation of the box-type transformer foundation adopts cast-in-situ pipe pile foundation, and a prefabricated steel structure platform is arranged on the pipe pile to install the box-type transformer equipment; the pipe pile pouring of the foundation adopts a buckle type steel formwork; the construction method comprises: foundation drilling, reinforcement cage manufacturing and installation, formwork installation, concrete pouring, concrete curing and steel structure platform installation; the box-type transformer equipment foundation is designed as the structure form of cast-in-situ pipe pile foundation combined with the steel structure platform, so that the foundation construction quality control is effectively guaranteed; after the equipment pipe pile foundation pouring is completed and the curing requirement is reached, the prefabricated steel structure platform is installed, the installation difficulty is smaller, the quality control is guaranteed, and the problems of equipment foundation seepage and leakage caused by the poor internal waterproof control of the equipment foundation in the traditional design scheme are avoided.

Description

Technical Field

[0001] This invention relates to the field of electrical engineering, and more particularly to the field of photovoltaic power generation technology, specifically a method for constructing a box-type transformer foundation in sandy soil conditions in areas with abundant water. Background Technology

[0002] As one of the core pieces of equipment in photovoltaic power generation projects, the main function of the box-type transformer is to collect and transmit electrical energy to the grid side to achieve grid-connected power generation. The foundation for the box-type transformer can be designed differently depending on the geological conditions. Conventional photovoltaic power generation projects typically use a cast-in-place foundation with a frame structure. However, in areas with heavy rainfall, controlling the waterproofing quality of the foundation is difficult, and the uncontrollable quality of the foundation will inevitably affect subsequent equipment installation work. Summary of the Invention

[0003] The purpose of this invention is to optimize the foundation structure and construction method of box-type transformer equipment for areas with abundant water resources.

[0004] To achieve the above objectives, the present invention is implemented as follows:

[0005] A method for constructing a box-type transformer foundation in sandy soil conditions in an area with abundant water resources. The equipment foundation of the box-type transformer foundation adopts a cast-in-place pipe pile foundation with a pile diameter of ϕ. The pile depth is determined based on geological survey data and the design of the superstructure layout, and the above-ground height is [not specified]. A total of six ϕ250 reinforced concrete cast-in-place pipe piles are installed. A prefabricated steel structure platform is set on the pipe piles for installing the box-type transformer equipment. The foundation pipe piles are poured using snap-fit ​​steel formwork. The construction method of the box-type transformer foundation includes:

[0006] Step 1: Site leveling and marking points;

[0007] Step 1.1: According to the construction drawings, level the area with a relatively large elevation within the matrix until it meets the design requirements;

[0008] Step 1.2: According to the construction drawings, use a geodetic GPS receiver to locate the foundation piles of the transformer substation. The locations must be accurate and consistent with the drawings, and marked with nails and red cloth for easy drilling.

[0009] Step 2, basic drilling;

[0010] Step 2.1 Before drilling, the site leveling requirements for the transformer substation foundation must be met according to the construction drawings. First, use a level to mark the plane position and elevation control points of the transformer substation foundation according to the coordinates provided in the design drawings, and use a level to control the elevation of the 6 column foundations of the transformer substation foundation.

[0011] Step 2.2: Due to geological constraints, large drilling rigs face difficulties in navigating rocky terrain and are challenging to position. Therefore, this project primarily utilizes crawler-mounted down-the-hole drills. Before drilling, ensure the drill bit is level with the pile foundation coordinates. During drilling, align the center of the drill bit with the center of the hole and use a plumb line to ensure the drill bit's verticality. Strictly control the verticality and depth during drilling. If hole deviation or offset is detected, correct it promptly, and if necessary, enlarge the hole. When drilling, keep the drilled sand away from the hole edge to prevent surrounding sand from accumulating after the drill rod is pulled out. Vibration can cause the material to collapse into the hole, resulting in insufficient hole depth. After drilling a pile foundation with a mechanical drilling machine, a pre-prepared Ø250 PVC test tube should be inserted into the drilled pile foundation hole to verify the depth and verticality of the pile foundation hole. The depth should be controlled within a certain range, and the verticality should be controlled within 1%. After drilling each pile foundation hole, a special protective device should be used to plug the pile foundation opening. Mechanical drilling requires that, under the condition that the hole depth meets the requirements, the deviation of each group of pile holes should be checked with a steel wire, and the hole spacing should be re-measured to ensure that the deviation of the pile hole center does not exceed a certain limit.

[0012] Step 3: Fabrication and installation of the reinforcing cage;

[0013] Step 3.1: The reinforcing bars for cast-in-place foundations are fabricated and installed on-site. Before fabricating the reinforcing bars, the factory certificate of conformity of the steel must be checked, and physical and mechanical performance tests and welding quality tests must be conducted on the material of the reinforcing bars. Then, the diameter, length, specifications, quantity and fabrication quality of the reinforcing bars must be checked according to the design and construction specifications.

[0014] Step 3.2: Finished steel reinforcement embedded piles can only be used after being inspected and approved by the supervisor; steel reinforcement embedded piles should be transported to the site using small engineering vehicles, and the steel reinforcement embedded piles must be protected from damage and deformation during transportation; steel reinforcement embedded piles should be inspected twice during installation. If deviations in the spacing of the main reinforcement and stirrups or deformation of the steel reinforcement piles are found, on-site adjustments should be made. The installation position of the steel reinforcement embedded piles should be ensured to be away from the hole wall. If the installation position of the steel reinforcement embedded piles is found to be offset during the pouring process, manual adjustments should be made in a timely manner during the pouring process.

[0015] Step 4: Template installation;

[0016] Step 4.1: The foundation piles of the box-type transformer are poured using specially made cylindrical steel formwork. Before the formwork is installed, the edge lines and control lines must be marked out. Before the formwork is closed, any impurities in the area should be thoroughly cleaned.

[0017] Step 4.2: Hoist the column formwork into place, erect scaffolding to initially fix the 6 column formworks, adjust the column formworks and check and measure the relative positions between the column formworks. All measured dimensions meet the requirements of the design drawings.

[0018] Step 4.3: After inspection and approval, tighten the scaffolding, finally fix the column formwork, and re-check the relative positions of each column formwork to ensure that the requirements are met;

[0019] Step 5: Concrete pouring;

[0020] Concrete pouring must not be interrupted. Before pouring, the mixing plant, transport vehicle, and vibrator must be carefully inspected; the power lines must also be checked to prevent the concrete pouring from being interrupted.

[0021] Step 5.1 Before pouring, check whether the drilling quality meets the requirements. The center distance between adjacent pile holes in the same group and the pile positions in the same row should be on the same straight line. It is necessary to carefully check the arrival of concrete on site and the integrity of generator, vibrator, magnetic level, and string. Check the power line to prevent vibration interruption during concrete pouring.

[0022] Step 5.2: When the center lines of the tops of the same row of piles are on the same straight line, pour concrete into the pile foundation hole while vibrating it to fill the hollow parts of the embedded steel reinforcement piles with C30 concrete and compact the concrete in the pile foundation hole. The concrete of the cast-in-place piles for the transformer substation foundation adopts the pipe-pulling method, that is, pouring concrete, vibrating and pulling out the casing at the same time to ensure that the concrete of the underground cast-in-place pile is continuously poured in the casing.

[0023] Step 5.3: When pouring concrete, the thickness of each layer of material should be controlled within the specified range. Vibration should be carried out using a flexible shaft insertion vibrator. When vibrating, the insertion depth into the lower layer of concrete should not be less than the specified depth, and the vibration depth should be ensured to exceed the bottom of the sleeve. The vibration time should be controlled between 15s and 20s. Vibration should be carried out by inserting the shaft quickly and withdrawing it slowly as required. There should be no missed vibration or over-vibration, so as not to reduce the concrete strength and affect the concrete quality.

[0024] Step 5.4: When pouring concrete, quality inspection personnel are required to test the slump and temperature on-site and keep records. At the same time, sampling should be carried out to ensure the effective implementation of concrete pouring.

[0025] Step 6: Concrete Curing

[0026] Step 6.1 After the concrete for the foundation piles of the transformer substation is poured, curing should begin 6-18 hours later. During the high-temperature season, curing can be started earlier depending on the degree of concrete solidification. A dedicated person should be assigned to spray water for curing to keep the concrete surface moist.

[0027] Step 7: Steel structure platform installation;

[0028] Step 7.1: The steel structure platform of the box-type transformer is installed on the cast-in-place pile foundation. The steel structure platform adopts a prefabricated structure. Before hoisting the steel structure platform, the elevation of the 6 pipe piles is measured with a level. The elevation error is required to be no greater than 1. If the elevation error does not meet the requirements, the elevation of the 6 pipe piles must be leveled and adjusted.

[0029] Step 7.2: Select a suitable truck crane for lifting operations based on the specifications, dimensions, and weight of the box-type transformer. Use the special lifting tools provided by the equipment manufacturer for lifting operations, and select the lifting points according to the requirements of the equipment instructions.

[0030] Step 7.3: When installing the steel structure platform, pay attention to the relative position of the top of the 6 pipe pile foundations and the steel structure base. The main beam must be in full contact with the top of the pipe pile foundations and be in the middle position. After hoisting, measure the installation position of the equipment base on the steel structure platform. If the elevation error exceeds the limit, shims need to be added for adjustment.

[0031] Step 7.4: Weld and fix the steel structure platform to the top embedded parts of the pipe pile foundation to ensure that the foundation is firm. Spot welding is not allowed.

[0032] Based on the project's geological characteristics, this invention designs the foundation of the box-type transformer equipment as a combination of cast-in-place pipe pile foundation and steel structure platform. This effectively ensures the quality control of foundation construction. A special steel model is used to assist in the casting of the equipment foundation pipe piles, further guaranteeing construction quality. After the equipment pipe pile foundation is cast and meets curing requirements, the prefabricated steel structure platform is installed. This process is less difficult and ensures quality control, while also avoiding the water seepage and leakage problems that may arise from poor internal waterproofing control in traditional designs. Attached Figure Description

[0033] Figure 1 This is a layout diagram of the transformer substation foundation.

[0034] Figure 2 This is a diagram showing the reinforcement design for cast-in-place piles.

[0035] Figure 3 This is a plan view of the steel beams for the transformer substation foundation.

[0036] Figure 4 This is a side view of the transformer substation structure. Detailed Implementation

[0037] The present invention will be further illustrated below through specific embodiments.

[0038] like Figures 1-4 A method for constructing a box-type transformer foundation in sandy soil conditions in an area with abundant water resources is disclosed. The equipment foundation of the box-type transformer foundation adopts a cast-in-place pipe pile foundation with a diameter of ϕ (250 mm). The pile foundation depth is determined based on geological survey data and the design of the superstructure layout, and the above-ground height is [not specified]. A total of six ϕ250 mm reinforced concrete cast-in-place pipe piles are installed, and a prefabricated steel structure platform is set on the pipe piles for installing the box-type transformer equipment. The foundation pipe piles are poured using snap-fit ​​steel formwork. The method for constructing the box-type transformer foundation includes:

[0039] Step 1: Site leveling and marking points;

[0040] Step 1.1: According to the construction drawings, level the area with a relatively large elevation within the matrix until it meets the design requirements;

[0041] Step 1.2: According to the construction drawings, use a geodetic GPS receiver to locate the foundation piles of the transformer substation. The locations must be accurate and consistent with the drawings, and marked with nails and red cloth for easy drilling.

[0042] Step 2, basic drilling;

[0043] Step 2.1 Before drilling, the site leveling requirements for the transformer substation foundation must be met according to the construction drawings. First, use a level to mark the plane position and elevation control points of the transformer substation foundation according to the coordinates provided in the design drawings, and use a level to control the elevation of the 6 column foundations of the transformer substation foundation.

[0044] Step 2.2: Due to geological constraints, large drilling rigs face difficulties in navigating rocky terrain and are challenging to position. Therefore, this project primarily utilizes crawler-mounted down-the-hole drills. Before drilling, ensure the drill bit is level with the pile foundation coordinates. During drilling, align the center of the drill bit with the center of the hole and use a plumb line to ensure the drill bit's verticality. Strictly control the verticality and depth during drilling. If hole deviation or offset is detected, correct it promptly, and if necessary, enlarge the hole. When drilling, keep the drilled sand away from the hole edge to prevent surrounding sand from accumulating after the drill rod is pulled out. Vibration can cause the material to collapse into the hole, resulting in insufficient hole depth. After drilling a pile foundation with a mechanical drilling machine, a pre-prepared Ø250 PVC test tube should be inserted into the drilled pile foundation hole to verify the depth and verticality of the pile foundation hole. The depth should be controlled within a certain range, and the verticality should be controlled within 1%. After drilling each pile foundation hole, a special protective device should be used to plug the pile foundation opening. Mechanical drilling requires that, under the condition that the hole depth meets the requirements, the deviation of each group of pile holes should be checked with a steel wire, and the hole spacing should be re-measured to ensure that the deviation of the pile hole center does not exceed a certain limit.

[0045] Step 3: Fabrication and installation of the reinforcing cage;

[0046] Step 3.1: The reinforcing bars for cast-in-place foundations are fabricated and installed on-site. Before fabricating the reinforcing bars, the factory certificate of conformity of the steel must be checked, and physical and mechanical performance tests and welding quality tests must be conducted on the material of the reinforcing bars. Then, the diameter, length, specifications, quantity and fabrication quality of the reinforcing bars must be checked according to the design and construction specifications.

[0047] Step 3.2: Finished steel reinforcement embedded piles can only be used after being inspected and approved by the supervisor; steel reinforcement embedded piles should be transported to the site using small engineering vehicles, and the steel reinforcement embedded piles must be protected from damage and deformation during transportation; steel reinforcement embedded piles should be inspected twice during installation. If deviations in the spacing of the main reinforcement and stirrups or deformation of the steel reinforcement piles are found, on-site adjustments should be made. The installation position of the steel reinforcement embedded piles should be ensured to be away from the hole wall. If the installation position of the steel reinforcement embedded piles is found to be offset during the pouring process, manual adjustments should be made in a timely manner during the pouring process.

[0048] Step 4: Template installation;

[0049] Step 4.1: The foundation piles of the box-type transformer are poured using specially made cylindrical steel formwork. Before the formwork is installed, the edge lines and control lines must be marked out. Before the formwork is closed, any impurities in the area should be thoroughly cleaned.

[0050] Step 4.2: Hoist the column formwork into place, erect scaffolding to initially fix the 6 column formworks, adjust the column formworks and check and measure the relative positions between the column formworks. All measured dimensions meet the requirements of the design drawings.

[0051] Step 4.3: After inspection and approval, tighten the scaffolding, finally fix the column formwork, and re-check the relative positions of each column formwork to ensure that the requirements are met;

[0052] Step 5: Concrete pouring;

[0053] Concrete pouring must not be interrupted. Before pouring, the mixing plant, transport vehicle, and vibrator must be carefully inspected; the power lines must also be checked to prevent the concrete pouring from being interrupted.

[0054] Step 5.1 Before pouring, check whether the drilling quality meets the requirements. The center distance between adjacent pile holes in the same group and the pile positions in the same row should be on the same straight line. It is necessary to carefully check the arrival of concrete on site and the integrity of generator, vibrator, magnetic level, and string. Check the power line to prevent vibration interruption during concrete pouring.

[0055] Step 5.2: When the center lines of the tops of the same row of piles are on the same straight line, pour concrete into the pile foundation hole while vibrating it to fill the hollow parts of the embedded steel reinforcement piles with C30 concrete and compact the concrete in the pile foundation hole. The concrete of the cast-in-place piles for the transformer substation foundation adopts the pipe-pulling method, that is, pouring concrete, vibrating and pulling out the casing at the same time to ensure that the concrete of the underground cast-in-place pile is continuously poured in the casing.

[0056] Step 5.3: When pouring concrete, the thickness of each layer of material should be controlled within the specified range. Vibration should be carried out using a flexible shaft insertion vibrator. When vibrating, the insertion depth into the lower layer of concrete should not be less than the specified depth, and the vibration depth should be ensured to exceed the bottom of the sleeve. The vibration time should be controlled between 15s and 20s. Vibration should be carried out by inserting the shaft quickly and withdrawing it slowly as required. There should be no missed vibration or over-vibration, so as not to reduce the concrete strength and affect the concrete quality.

[0057] Step 5.4: When pouring concrete, quality inspection personnel are required to test the slump and temperature on-site and keep records. At the same time, sampling should be carried out to ensure the effective implementation of concrete pouring.

[0058] Step 6: Concrete Curing

[0059] Step 6.1 After the concrete for the foundation piles of the transformer substation is poured, curing should begin 6-18 hours later. During the high-temperature season, curing can be started earlier depending on the degree of concrete solidification. A dedicated person should be assigned to spray water for curing to keep the concrete surface moist.

[0060] Step 7: Steel structure platform installation;

[0061] Step 7.1: The steel structure platform of the box-type transformer is installed on the cast-in-place pile foundation. The steel structure platform adopts a prefabricated structure. Before hoisting the steel structure platform, the elevation of the 6 pipe piles is measured with a level. The elevation error is required to be no greater than 1. If the elevation error does not meet the requirements, the elevation of the 6 pipe piles must be leveled and adjusted.

[0062] Step 7.2: Select a suitable truck crane for lifting operations based on the specifications, dimensions, and weight of the box-type transformer. Use the special lifting tools provided by the equipment manufacturer for lifting operations, and select the lifting points according to the requirements of the equipment instructions.

[0063] Step 7.3: When installing the steel structure platform, pay attention to the relative position of the top of the 6 pipe pile foundations and the steel structure base. The main beam must be in full contact with the top of the pipe pile foundations and be in the middle position. After hoisting, measure the installation position of the equipment base on the steel structure platform. If the elevation error exceeds the limit, shims need to be added for adjustment.

[0064] Step 7.4: Weld and fix the steel structure platform to the top embedded parts of the pipe pile foundation to ensure that the foundation is firm. Spot welding is not allowed.

[0065] This invention studies sandy soil geological projects in areas with abundant water resources, innovates the foundation structure of box-type transformer equipment, optimizes construction methods and processes, reduces the construction difficulty of box-type transformer equipment foundations, effectively ensures construction quality throughout the entire life cycle, and reduces early costs.

[0066] An innovative design was adopted for the foundation structure of the box-type transformer equipment, combining on-site cast-in-place foundations with a steel structure platform. This avoids the difficulties in controlling internal waterproofing of the foundation caused by traditional designs. Simultaneously, the construction methods and processes were optimized, employing specialized rigid molds to assist in foundation casting, ensuring casting quality. The detailed and convenient operation process ensured installation quality and reduced safety hazards.

Claims

1. A method for constructing a box-type transformer foundation in sandy soil conditions in an area with abundant water, wherein the equipment foundation of the box-type transformer foundation adopts a cast-in-place pipe pile foundation, with a total of 6 Ø250 reinforced concrete cast-in-place pipe piles, and a prefabricated steel structure platform is set on the pipe piles for installing the box-type transformer equipment; the foundation pipe piles are cast using snap-fit ​​steel formwork; characterized in that... The construction method of the box-type transformer foundation includes: Step 1: Site leveling and marking points; Step 1.1: According to the construction drawings, level the area with a relatively large elevation within the matrix until it meets the design requirements; Step 1.2: According to the construction drawings, use a geodetic GPS receiver to locate the foundation piles of the transformer substation. The locations must be accurate and consistent with the drawings. Mark the locations with nails and red cloth to facilitate drilling. Step 2, basic drilling; Step 2.1 Before drilling, the site leveling requirements for the transformer substation foundation must be met according to the construction drawings. First, use a level to mark the plane position and elevation control points of the transformer substation foundation according to the coordinates provided in the design drawings, and use a level to control the elevation of the 6 column foundations of the transformer substation foundation. Step 2.2: Due to geological constraints, large drilling equipment has difficulty moving and positioning on rocky terrain. Therefore, this project mainly uses crawler down-the-hole drilling rigs. Before drilling, ensure the drill bit and pile foundation coordinates are level. During drilling, align the center of the drill bit with the center of the hole and use a plumb line to ensure the verticality of the drill bit. Strictly control the verticality and depth during drilling. If the hole is found to be skewed or deviated, correct it in time and enlarge the hole if necessary. When drilling, keep the drilled sand away from the edge of the hole to prevent the surrounding sand from collapsing into the hole due to vibration after the drill rod is pulled out, resulting in insufficient hole depth. After drilling a pile foundation with a mechanical drilling machine, insert a pre-prepared Ø250 PVC test tube into the drilled pile foundation hole to verify the depth and verticality of the pile foundation hole. The verticality should be controlled within 1%. After drilling each pile foundation hole, use special protective facilities to plug the pile foundation opening. Mechanical drilling requires that, under the condition that the hole depth meets the requirements, the deviation of each group of pile holes must be checked with a steel wire, and the hole spacing must be re-measured and checked. Step 3: Fabrication and installation of the reinforcing cage; Step 3.1: The reinforcing bars for cast-in-place foundations are fabricated and installed on-site. Before fabricating the reinforcing bars, the factory certificate of conformity of the steel must be checked, and physical and mechanical performance tests and welding quality tests must be conducted on the material of the reinforcing bars. Then, the diameter, length, specifications, quantity and fabrication quality of the reinforcing bars must be checked according to the design and construction specifications. Step 3.2: Finished steel reinforcement embedded piles can only be used after being inspected and approved by the supervisor; steel reinforcement embedded piles should be transported to the site using small engineering vehicles, and the steel reinforcement embedded piles must be protected from damage and deformation during transportation; steel reinforcement embedded piles should be inspected twice during installation. If deviations in the spacing of the main reinforcement and stirrups or deformation of the steel reinforcement piles are found, on-site adjustments should be made. If the installation position of the steel reinforcement embedded piles is found to be offset during the pouring process, manual adjustments should be made in a timely manner during the pouring process. Step 4: Template installation; Step 4.1: The foundation piles of the box-type transformer are poured using specially made cylindrical steel formwork. Before the formwork is installed, the edge lines and control lines must be marked out. Before the formwork is closed, any impurities in the area should be thoroughly cleaned. Step 4.2: Hoist the column formwork into place, erect scaffolding to initially fix the 6 column formworks, adjust the column formworks and check and measure the relative positions between the column formworks. All measured dimensions meet the requirements of the design drawings. Step 4.3: After inspection and approval, tighten the scaffolding, finally fix the column formwork, and re-check the relative positions of each column formwork to ensure that the requirements are met; Step 5: Concrete pouring; Concrete pouring must not be interrupted. Before pouring, the mixing plant, transport vehicle, and vibrator must be carefully inspected; the power lines must also be checked to prevent the concrete pouring from being interrupted. Step 5.1 Before pouring, check whether the drilling quality meets the requirements. The center distance between adjacent pile holes in the same group and the pile positions in the same row should be on the same straight line. It is necessary to carefully check the arrival of concrete on site and the integrity of generator, vibrator, magnetic level, and string. Check the power line to prevent vibration interruption during concrete pouring. Step 5.2: When the center lines of the tops of the same row of piles are on the same straight line, pour concrete into the pile foundation hole while vibrating it to fill the hollow parts of the embedded steel reinforcement piles with C30 concrete and compact the concrete in the pile foundation hole. The concrete of the cast-in-place piles for the transformer substation foundation adopts the pipe-pulling method, that is, pouring concrete, vibrating and pulling out the casing at the same time to ensure that the concrete of the underground cast-in-place pile is continuously poured in the casing. Step 5.3: Vibration should be performed using a flexible shaft insertion vibrator; the vibration time should be controlled between 15s and 20s, and the vibration should be performed by inserting the shaft quickly and withdrawing it slowly as required; there should be no missed vibration or over-vibration, so as not to reduce the concrete strength and affect the concrete quality. Step 5.4: When pouring concrete, quality inspection personnel are required to test the slump and temperature on-site and keep records. At the same time, sampling should be carried out to ensure the effective implementation of concrete pouring. Step 6: Concrete Curing Step 6.1 After the concrete for the foundation piles of the transformer substation is poured, curing should begin 6-18 hours later. During the high-temperature season, curing can be started earlier depending on the degree of concrete solidification. A dedicated person should be assigned to spray water for curing to keep the concrete surface moist. Step 7: Steel structure platform installation; Step 7.1: The steel structure platform of the box-type transformer is installed on the cast-in-place pile foundation. The steel structure platform adopts a prefabricated structure. Before hoisting the steel structure platform, the elevation of the 6 pipe piles is measured with a level. If the elevation error does not meet the requirements, the elevation of the 6 pipe piles must be leveled and adjusted. Step 7.2: Select a suitable truck crane for lifting operations based on the specifications, dimensions, and weight of the box-type transformer. Use the special lifting tools provided by the equipment manufacturer for lifting operations, and select the lifting points according to the requirements of the equipment instructions. Step 7.3: When installing the steel structure platform, pay attention to the relative position of the top of the 6 pipe pile foundations and the steel structure base. The main beam must be in full contact with the top of the pipe pile foundations and be in the middle position. After hoisting, measure the installation position of the equipment base on the steel structure platform. Step 7.4: Weld and fix the steel structure platform to the top embedded parts of the pipe pile foundation to ensure that the foundation is firm. Spot welding is not allowed.

Images