Steel pipe orifice fixing device and using method thereof

Abstract

The invention relates to the technical field of steel pipe construction safety, in particular to a steel pipe opening fixing device and a using method thereof.A main body is provided with a telescopic mechanism and a supporting mechanism, and supporting is provided; the tail end of the supporting mechanism can stretch into the inner side annular welding seam of the pipe openings of the two steel pipes which are in butt joint on the premise that butt joint of the pipe openings of the two steel pipes is not affected basically, then the main body can be stably supported, and operation facilities can be conveniently arranged on the main body; the distance between each supporting mechanism and the center of the main body can be adjusted through the corresponding telescopic mechanism, so that the tail end of each supporting mechanism can quickly extend into an inner side annular welding seam or be taken out from the inner side annular welding seam; the main body can be directly lifted to the top surface of the upper steel pipe in the two sections of steel pipes which are butted up and down from the inner side annular welding seam between the two sections of steel pipes which are butted up and down through the lifting device, and subsequent construction is carried out, so that the procedure is simpler.

Description

Technical Field

[0001] This invention relates to the field of steel pipe construction safety technology, and in particular to a steel pipe end fixing device and its usage method. Background Technology

[0002] When installing steel pipes (especially large steel pipes such as pressure steel pipes) in inclined or vertical shafts, it is often necessary to build an auxiliary construction platform for pipe alignment, welding, corrosion protection, and other operations. Hooks or clamps are typically used to secure the construction platform to the pipe opening to prevent falls and reduce the risks of working at height. Some projects also use temporary welding or clamping methods to fix the platform to the inner wall of the steel pipe; these welds or clamps are then removed after construction is completed.

[0003] Existing technologies for fixing construction platforms via pipe openings use hooks or clamps, which occupy the pipe opening space. When the next section of steel pipe to be installed is positioned and connected, the fixing hooks or clamps at the pipe opening must be disengaged before the two sections can be connected. For example, the Chinese patent technology disclosed in authorization announcement number CN118373313B uses a locking beam on the work platform and locking claws to hold it at the pipe opening to fix the construction platform for the vertical shaft steel pipe. This technology requires connecting the hoisting rope before each connection, raising the locking beam, and then retracting the locking claws to avoid interference between the locking claws and the connection work. The process is cumbersome and cannot allow for vertical lifting and adjustment of the steel pipe. After the steel pipes are connected, if the pipe opening is uneven, it is difficult to make local fine adjustments using the lifting points. Fixing the platform by temporary welding or clamping to the inner wall of the steel pipe requires a large amount of manual labor, involves frequent high-altitude work, and poses high safety risks. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology, which uses a working platform locking beam and locking claws to fix the construction platform of the vertical shaft steel pipe, and requires connecting the hoisting rope before each pipe operation, raising the locking beam and then retracting the locking claws to avoid interference between the locking claws and the pipe operation, which is a cumbersome process. The invention provides a steel pipe opening fixing device and its usage method.

[0005] In a first aspect, the present invention provides a steel pipe end fixing device, comprising: The main body has an axis and at least three support mechanisms are distributed circumferentially on the main body. The main body can be used to install working facilities. The telescopic mechanism is provided in each of the support mechanisms. The telescopic mechanism is used to adjust the distance of the support mechanism relative to the center of the main body. The telescopic mechanism can adjust the end of the support mechanism to extend into the inner circumferential weld between the two steel pipe sections that are joined together. The lifting device is capable of lifting the main body from the inner annular weld between the two steel pipe sections to the top surface of the upper steel pipe.

[0006] The steel pipe end fixing device of this invention has a main body for setting up a telescopic mechanism and a support mechanism to provide support. Without significantly affecting the connection of the two steel pipe ends, the end of the support mechanism can extend into the inner annular weld between the upper and lower steel pipe ends, allowing stable support from the inner side of the top surface of the lower installed steel pipe end, thereby stably supporting the main body for setting up working facilities. Compared to the prior art, which requires connecting a lifting rope, raising the locking beam, and then retracting the locking claw before each pipe connection to avoid interference between the locking claw and the pipe connection operation, this application provides a corresponding support mechanism for each of the aforementioned support mechanisms. The telescopic mechanism is used to adjust the distance between the support mechanism and the center of the main body. Since the end of the support mechanism does not affect the placement of the bottom pipe opening of the upper steel pipe on the top pipe opening of the lower steel pipe, the adjustment of the telescopic mechanism is not affected by the support mechanism, the inner annular weld, and the main body. This allows the end of the support mechanism to quickly extend into or out of the inner annular weld. The main body can be directly lifted from the inner annular weld between the two connected steel pipe sections to the top surface of the upper steel pipe in the two connected steel pipe sections by the lifting device for subsequent construction. This process is simpler.

[0007] Preferably, the longitudinal section of the end of the support mechanism on the side away from the center of the main body is rectangular or wedge-shaped. It is sufficient that the end of the support mechanism can extend into the inner circumferential weld between the upper and lower steel pipes without affecting the contact between the pipe ends of the upper and lower steel pipes, and can ensure that the working facilities below can provide stable force.

[0008] Preferably, the longitudinal section of the end of the support mechanism away from the center of the main body is wedge-shaped, the height of the end of the support mechanism away from the center of the main body is less than the height of the end of the support mechanism near the center of the main body, and the upper part of the end of the support mechanism is a first upper inclined surface and the lower part is a first lower plane or a first lower inclined surface, or the upper part of the end of the support mechanism is a first upper plane and the lower part is a first lower inclined surface.

[0009] The inner annular weld between the ends of the upper and lower steel pipes may be K-shaped or V-shaped. The height of the end of the support mechanism on the side away from the center of the main body is less than the height on the side closer to the center of the main body. The longitudinal section of the end of the support mechanism on the side away from the center of the main body is wedge-shaped, which can make the volume of the end of the support mechanism entering the inner annular weld larger, thereby improving the support capacity. Furthermore, by adjusting the distance of the support mechanism relative to the center of the main body through the telescopic mechanism, the support position between the first upper inclined surface and / or the first lower inclined surface of the end of the support mechanism and the bevel of the inner annular weld can be changed, thereby locally adjusting the height of the upper steel pipe and adjusting the flatness of the joint between the upper and lower steel pipes.

[0010] More preferably, the inclination angle of the first upper inclined surface at the end of the support mechanism is less than or equal to the angle of the minimum bevel for welding the steel pipe, and when the end of the support mechanism is below the first lower inclined surface, the inclination angle of the first lower inclined surface at the end of the support mechanism is less than or equal to the angle of the minimum bevel for welding the steel pipe.

[0011] The angle of the first upper inclined surface at the end of the support mechanism is less than or equal to the angle of the minimum bevel of the steel pipe weld, which allows the support mechanism to extend a longer length into the inner circumferential weld and provide better support.

[0012] Preferably, the first upper inclined surface at the end of the support mechanism has an inclination angle of less than or equal to 60°, which provides greater vertical force and better vertical support effect.

[0013] Preferably, the telescopic mechanism is a hydraulic cylinder, a jack, an electric push rod, or an electric screw.

[0014] Preferably, when the telescopic mechanism uses a hydraulic cylinder, the main body is provided with a support guide rail corresponding to the support mechanism in the circumferential direction. The support guide rail is arranged radially along the main body. The support mechanism is slidably disposed on the support guide rail. One end of the hydraulic cylinder is connected to the main body, and the other end is hinged to the support mechanism. The hinge axis of the hydraulic cylinder and the support mechanism is perpendicular to both the stroke direction of the hydraulic cylinder and the axial direction of the main body.

[0015] The support mechanism is guided by the support rail, which allows the end of the support mechanism to quickly extend into or out of the inner annular weld between the pipe openings of the upper and lower steel pipes. The hydraulic cylinder is hinged to the support mechanism, allowing the support mechanism to rotate up and down. However, due to the limitation of the support rail, the angle of rotation of the support mechanism is small, which will not affect the support capacity of the steel pipe opening fixing device, but will ensure that the support force does not act on the hydraulic cylinder, reducing the possibility of damage to the hydraulic cylinder.

[0016] More preferably, the supporting guide rail is a guide rod, and the supporting mechanism is sleeved on the outside of the guide rod; Alternatively, the supporting guide rail is a guide sleeve, and the supporting mechanism is sleeved on the outside of the guide sleeve, or the guide sleeve is sleeved on the outside of the supporting mechanism.

[0017] By using a nested design, the support mechanism can be better restricted, thereby improving the support capacity of the steel pipe end fixing device.

[0018] More preferably, the cross-sections of the guide rod, the guide sleeve, and the support mechanism are all square to prevent the support mechanism from rotating and reduce the possibility of the support mechanism swaying along its axis, thereby improving the support capacity of the steel pipe end fixing device.

[0019] Preferably, the lifting device includes a first lifting mechanism above the upper steel pipe. The first lifting mechanism can connect the main body through a first sling. The first lifting mechanism can control the extension and shortening of the first sling. The first lifting mechanism can be a structure such as a winch installed at the wellhead. The first lifting mechanism can lift the main body from the inner annular weld between the two steel pipe sections to the top surface of the upper steel pipe. And / or, The lifting device includes a second lifting mechanism, which is equipped with a second sling. The second lifting mechanism can control the extension and shortening of the second sling. The second lifting mechanism and the second sling can be used together to connect the upper steel pipe and the main body. The position of the main body connected by the second lifting mechanism and the second sling is lower than that of the support mechanism. The second lifting mechanism can lift the main body from the inner annular weld between the two steel pipe sections to the top surface of the upper steel pipe.

[0020] Preferably, the upper part of the main body is provided with at least two lifting points, and the first sling can be connected to the lifting points; The lower part of the main body is provided with multiple sets of connection points, which are used to connect the working facilities or the second sling.

[0021] Optionally, the upper part of the main body is provided with multiple lifting points for hoisting the steel pipe end fixing device, which facilitates the upward lifting of the steel pipe end fixing device and the setting of auxiliary fixation, etc. The lower part of the main body is provided with multiple sets of connection points for connecting the working facilities. Without affecting the placement of the lower end of the upper steel pipe at the upper end of the lower steel pipe, the inner annular weld between the ends of the upper and lower steel pipes can be used as a support point to support the steel pipe end fixing device and fix the working facilities, so as to facilitate the spot welding and fixing of the inner annular weld between the ends of the upper and lower steel pipes using the working facilities.

[0022] Preferably, when the lifting device includes a second lifting mechanism, the second sling is connected to a tension sensor, which is capable of measuring the tension of the second sling; The support mechanism is equipped with a distance sensor, which is used to measure the length of the support mechanism extending into the inner annular weld between the two steel pipe sections that are joined together.

[0023] By measuring the length of the support mechanism extending into the inner annular weld between the two steel pipe sections using a distance sensor, it can be determined whether the suspension capacity for the work facility below meets the requirements, thus ensuring operational safety. Similarly, by measuring the tension of the second sling using a tension sensor, it can be determined whether the end of the support mechanism can be removed from the inner annular weld, further ensuring operational safety. In other words, at least one of the measurement results from the tension sensor and the distance sensor must meet the requirements to ensure that the stress on the work facility is always within acceptable limits. Furthermore, the second sling and the second lifting mechanism can withstand the upward supporting force from the inner annular weld on the support mechanism, providing a second layer of stress protection and improving safety when using the work facility.

[0024] In a second aspect, the present invention provides a method of using a steel pipe end fixing device, comprising the following steps: S1: Hoist or slide the steel pipe to be installed to the top opening position of the installed steel pipe, so that the bottom opening of the steel pipe to be installed contacts the top opening of the installed steel pipe, and the end of the support mechanism of the steel pipe opening fixing device is located between the inner annular weld between the bottom opening of the steel pipe to be installed and the top opening of the installed steel pipe, thus completing the docking of the bottom opening of the steel pipe to be installed and the top opening of the installed steel pipe. S2: Position welding of the inner circumferential weld between the bottom end of the steel pipe to be installed and the top end of the installed steel pipe is carried out above the working facility erected below the steel pipe end fixing device. S3: The steel pipe end fixing device and the working equipment are hoisted and stabilized together by the lifting device, and then the end of the support mechanism is retracted into the steel pipe by the telescopic mechanism. S4: The main body and working facilities are lifted together by the lifting device until the end of the support mechanism is aligned with the top opening of the steel pipe to be installed. The end of the support mechanism is extended by the telescopic mechanism so that the lower part of the end of the support mechanism of the steel pipe opening fixing device overlaps the inner side of the second lower plane of the top opening of the steel pipe to be installed or the lower bevel surface of the inner circumferential weld.

[0025] Using the aforementioned method for fixing the pipe ends, without affecting the connection between the bottom end of the pipe to be installed and the top end of the already installed pipe, the inner side of the second lower plane or the inner circumferential weld bevel of the top end of the already installed pipe is used to support the end of the support mechanism, thereby supporting the pipe end fixing device. This allows the working facility to be erected using the pipe end fixing device to first perform the locating weld of the inner circumferential weld between the bottom end of the pipe to be installed and the top end of the already installed pipe. By hoisting the pipe end fixing device and the working facility together and ensuring safety, the end of the support mechanism can be retracted into the pipe using a telescopic mechanism, completing the force transfer, and then... The lifting mechanism moves the steel pipe end fixing device and working equipment upwards to align the end of the support mechanism with the top surface of the top end of the steel pipe to be installed. Then, the telescopic mechanism extends the end of the support mechanism, so that the lower part of the end of the support mechanism of the steel pipe end fixing device overlaps the inner side of the second lower plane of the top end of the steel pipe to be installed or the lower bevel of the inner circumferential weld. This allows the force on the working equipment to be provided by the end of the support mechanism, enabling the steel pipe end fixing device and working equipment to fully weld the inner circumferential weld between the bottom end of the steel pipe to be installed and the top end of the installed steel pipe. In this way, the force on the end of the support mechanism will not interfere with the steel pipe, making the process simpler. Preferably, after step S4, when the current steel pipe to be installed has been installed, the installed steel pipe to be installed is used as the new installed steel pipe to install the next section of steel pipe to be installed. Then, steps S1-S4 are repeated to achieve cyclic construction.

[0026] Preferably, after step S4, the inner circumferential weld between the bottom opening of the steel pipe to be installed and the top opening of the already installed steel pipe is fully welded using the working equipment, and the installation of the steel pipe to be installed is completed.

[0027] Preferably, before step S1, the steel pipe end fixing device is used to temporarily fix the top end of the first section of steel pipe to be installed. Then, the first section of steel pipe to be installed is hoisted or lowered to the bottom of the vertical shaft or inclined shaft for installation to form the first section of installed steel pipe. The lower end of the support mechanism of the steel pipe end fixing device overlaps the inner side of the second lower plane of the top end of the first section of installed steel pipe or the inner circumferential weld bevel surface, thus completing the foundation construction and providing a foundation for subsequent cyclic construction.

[0028] Preferably, when the end of the support mechanism has a first upper inclined surface, between steps S1 and S2, if there is unevenness after the pipe ends are connected, the support mechanism is extended or retracted using a telescopic mechanism to change the support position of the first upper inclined surface at the end of the support mechanism and the inner slope of the bottom pipe opening of the steel pipe to be installed, thereby locally adjusting the height of the bottom pipe opening of the steel pipe to be installed, so that the adjacent pipe openings of the two steel pipes are connected smoothly.

[0029] Preferably, in step S3, the main body of the steel pipe end fixing device is connected to the spot-welded steel pipe to be installed by the second lifting mechanism and the second sling together, and the position of the main body connected by the second lifting mechanism and the second sling together is lower than that of the support mechanism. The second sling is equipped with a tension measuring device. The steel pipe end fixing device and the working facility are hoisted together by the first sling of the first lifting mechanism. The first lifting mechanism is located above the steel pipe to be installed. The first lifting mechanism can control the extension and shortening of the first sling. The tension measuring device measures whether the lifting force provided by the second sling to the steel pipe end fixing device and working facility meets the requirements. If it does, the end of the support mechanism is retracted into the steel pipe using the telescopic mechanism. If it does not meet the requirements, the length of the second sling is shortened by the second lifting mechanism to increase the lifting force provided by the second sling to the steel pipe end fixing device and working facility until the requirements are met. Then, the end of the support mechanism is retracted into the steel pipe using the telescopic mechanism.

[0030] Preferably, in step S4, after the main body and the working facility are lifted together by the lifting device until the end of the support mechanism is aligned with the top opening of the steel pipe to be installed, the end of the support mechanism is extended using the telescopic mechanism, and the distance of the extension of the end of the support mechanism is detected by the distance detection device to determine whether the extension distance meets the requirements. If the requirements are not met, the end of the support mechanism is extended further using the telescopic mechanism until the requirements are met.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention provides a steel pipe end fixing device, which provides support by incorporating a telescopic mechanism and a support mechanism in the main body. Without significantly affecting the connection of two steel pipe ends, the end of the support mechanism can extend into the inner annular weld between the two connected steel pipe ends, stably supporting the support mechanism using the top surface of the already installed steel pipe end, thereby stably supporting the main body for the installation of working facilities. Compared to existing technologies that require connecting a lifting rope, raising the locking beam, and then retracting the locking claw before each pipe connection to avoid interference between the locking claw and the pipe connection operation, this application provides a corresponding support mechanism for each of the aforementioned support mechanisms. The telescopic mechanism is used to adjust the distance between the support mechanism and the center of the main body. Since the end of the support mechanism does not affect the placement of the bottom pipe opening of the upper steel pipe on the top pipe opening of the lower steel pipe, the adjustment of the telescopic mechanism is not affected by the support mechanism, the inner annular weld, and the main body. This allows the end of the support mechanism to quickly extend into or out of the inner annular weld. The main body can be directly lifted from the inner annular weld between the two connected steel pipe sections to the top surface of the upper steel pipe in the two connected steel pipe sections by the lifting device for subsequent construction. This process is simpler.

[0032] 2. This invention provides a method for using a steel pipe end fixing device. Without affecting the connection between the bottom end of the steel pipe to be installed and the top end of the already installed steel pipe, the device utilizes the inner side of the second lower plane or the bevel of the inner annular weld of the top end of the already installed steel pipe to support the end of a supporting mechanism, thereby supporting the steel pipe end fixing device. This allows the installation of a working facility using the steel pipe end fixing device to first perform a locating weld on the inner annular weld between the bottom end of the steel pipe to be installed and the top end of the already installed steel pipe. By hoisting the steel pipe end fixing device and the working facility together, and ensuring safety, a telescopic mechanism can be used to retract the end of the supporting mechanism into the steel pipe, completing the force transfer. Then... The lifting mechanism can move the steel pipe end fixing device and working equipment as a whole to the top surface of the top end of the steel pipe to be installed, aligned with the end of the support mechanism. Then, the telescopic mechanism extends the end of the support mechanism, so that the lower part of the end of the support mechanism of the steel pipe end fixing device overlaps the inner side of the second lower plane of the top end of the steel pipe to be installed or the lower bevel of the inner circumferential weld. This allows the force on the working equipment to be provided by the end of the support mechanism. In this way, the inner circumferential weld between the bottom end of the steel pipe to be installed and the top end of the installed steel pipe can be fully welded using the steel pipe end fixing device and working equipment. In this way, the force on the end of the support mechanism will not interfere with the steel pipe, making the process simpler. Attached Figure Description Figure 1 A schematic diagram of one type of steel pipe end fixing device; Figure 2 for Figure 1 Top view; Figure 3 for Figure 1 Side view; Figure 4 This is a schematic diagram for steel pipe splicing (the upper steel pipe is half-sectioned). Figure 5 for Figure 4 Top view; Figure 6 for Figure 4 The front view; Figure 7 for Figure 4 Side view; Figure 8 This is a schematic diagram of the first state in which the end of the first type of support mechanism is supported between the circumferential welds of adjacent steel pipes; Figure 9 This is a schematic diagram of the second state where the end of the first type of support mechanism is supported between the circumferential welds of adjacent steel pipes; Figure 10 This is a schematic diagram of the first state where the end of the second type of support mechanism is supported between the circumferential welds of adjacent steel pipes; Figure 11 This is a schematic diagram of the second state in which the end of the second type of support mechanism is supported between the circumferential welds of adjacent steel pipes. Figure 12 This is a schematic diagram of a third state where the end of the second type of support mechanism is supported between the circumferential welds of adjacent steel pipes. Figure 13 This is a schematic diagram of the fourth state, where the end of the second type of support mechanism is supported between the circumferential welds of adjacent steel pipes. Figure 14 A schematic diagram of another form of steel pipe end fixing device; Figure 15 for Figure 14 Side view; Figure 16 This is a schematic diagram of the first state where the end of the third type of support mechanism is supported between the circumferential welds of adjacent steel pipes; Figure 17 This is a schematic diagram of the second state where the end of the third type of support mechanism is supported between the circumferential welds of adjacent steel pipes; Figure 18 This is a schematic diagram of the first state where the end of the third type of support mechanism is supported between the circumferential welds of adjacent steel pipes; Figure 19 This is a schematic diagram of the second state where the end of the third type of support mechanism is supported between the circumferential welds of adjacent steel pipes; Figure 20A schematic diagram showing the main body being moved to the top of the installed steel pipe using the first sling. Figure 21 This is a schematic diagram showing how the steel pipe to be installed is hoisted to the top of the already installed steel pipe using the first sling. Figure 22 This is a schematic diagram of connecting the second sling; Figures 23-24 A schematic diagram showing the main body being lifted using the first sling. Figure 25 A schematic diagram illustrating how the work facility was lowered to allow for the full welding of the inner circumferential weld.

[0033] Markings in the diagram: 1. Main body; 11. Lifting point; 12. Connection point; 2. Support mechanism; 21. First upper inclined plane; 22. First lower plane; 23. First lower inclined plane; 3. Telescopic mechanism; 31. Hydraulic cylinder; 4. Support guide rail; 41. Hinge shaft; 5. Steel pipe; 51. Bevel; 52. Second lower plane; 53. Inner circumferential weld; 61. Distance sensor; 62. Tension sensor; 71. First sling; 72. Second sling; 8. Working equipment. Detailed Implementation

[0034] The present invention will now be described in further detail with reference to specific embodiments. However, this should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0035] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of the present invention is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the present invention or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a particular device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on the present invention.

[0036] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but that it can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0037] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0038] Furthermore, in the description of the embodiments of the present invention, "several", "more than", and "a number of" represent at least two. The number can be any number, such as 2, 3, 4, 5, 6, 7, 8, or 9, and can even exceed nine.

[0039] Furthermore, in the description of the technical solution of this invention, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "provided with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0040] Example 1 like Figures 1-8 As shown, a steel pipe end fixing device includes a main body 1, a support mechanism 2, a telescopic mechanism 3, and a lifting device. The main body 1 has an axis and is made of profiles, plates, etc., with an overall ring or star-shaped structure to adapt to the shape of the steel pipe end 5. Figure 1-3 As shown, the main body 1 is a ring structure; as Figure 4-7 As shown, the main body 1 has a cross-shaped structure. In addition to the ring structure and the cross-shaped structure, the main body 1 can also be a regular polygonal prism, etc.

[0041] In this embodiment, the lifting device can lift the main body from the inner annular weld between the two joined steel pipe sections to the top surface of the upper steel pipe. In an optional embodiment, the lifting device includes a first lifting mechanism and / or a second lifting mechanism; that is, only one of the first and second lifting mechanisms can be provided, or both can be provided.

[0042] The first lifting mechanism is located above the upper steel pipe, such as at the opening of a vertical or inclined shaft. The first lifting mechanism connects to the main body via a first sling. The first lifting mechanism can control the extension and retraction of the first sling; for example, the first lifting mechanism can employ a winch or electric hoist. The first lifting mechanism can lift the main body from the inner annular weld between two joined steel pipe sections to the top surface of the upper steel pipe. In an optional embodiment, the main body 1 has at least two lifting points 11 on its upper part. These lifting points 11 are used for lifting the main body, and can be connected to the lower end of the first sling. The lifting points do not necessarily need to be located on the upper part of the main body 1; placing them on the upper part of the main body 1 is more convenient for lifting. (See reference...) Figure 20 Four lifting points are evenly spaced along the circumference of the main body 1. The lifting points can be connected to the first lifting mechanism set at the wellhead through the first lifting cable 71. For example, the first lifting mechanism can be set at the wellhead of a vertical shaft or an inclined shaft. The first lifting mechanism can pull the main body upward and provide vertical force.

[0043] The second lifting mechanism is equipped with a second sling. The second lifting mechanism can control the extension and shortening of the second sling. The second lifting mechanism and the second sling can be used together to connect the upper steel pipe and the main body. The position of the main body connected by the second lifting mechanism and the second sling is lower than that of the support mechanism. The second lifting mechanism can lift the main body from the inner annular weld between the two steel pipe sections to the top surface of the upper steel pipe in the two steel pipe sections.

[0044] Specifically, the second lifting mechanism and the second sling can be used together to connect the upper steel pipe and the main body, and can be done in the following ways: Method 1: The second lifting mechanism is connected to the upper steel pipe, and the second sling is connected to the main body and the connection position is lower than the support mechanism. The second lifting mechanism can lift the main body by changing the length of the second sling. Method 2: The second sling is connected to the steel pipe, and the second lifting mechanism is connected to the main body and the connection position is lower than the support mechanism. The second lifting mechanism can lift the main body by changing the length of the second sling, and the second lifting mechanism rises with the main body. Only the connection point of the second sling to the steel pipe needs to be changed to realize cyclic construction without the need to move the second lifting mechanism up separately. Method 3: Both the second lifting mechanism and the second sling are connected to steel pipes. A fixed pulley or other steering device is installed on the main body, lower than the supporting mechanism. The second sling is routed around the fixed pulley or other steering device with both ends pointing upwards. The lifting mechanism can lift the main body by changing the length of the second sling, and this method requires less force from the lifting mechanism. Of course, methods 1 and 2 can also use fixed pulleys to steer the second sling.

[0045] All three methods described above can achieve the following: the second lifting mechanism and the second sling can be used together to connect the upper steel pipe and the main body; the position where the second lifting mechanism and the second sling are used to connect the main body is lower than the supporting mechanism; the second lifting mechanism can lift the main body from the inner annular weld between the two steel pipe sections to the top surface of the upper steel pipe. The second lifting mechanism can be a winch, electric hoist, or hand chain hoist, etc.

[0046] like Figure 22 As shown, the lower part of the main body 1 is provided with several connection points 12, which are used to connect to the work facilities or second slings that need to be suspended below. Both the lifting points 11 and the connection points 12 can adopt the structure of lifting rings. The lower connection points 12 can also be connected by bolts or other methods. The number of lifting points 11 and connection points 12 is selected according to the actual situation.

[0047] like Figure 23 As shown, a second sling 72 is connected to the bottom of the main body. The upper end of the second sling is fixed to the upper end of the upper steel pipe, and the lower end of the second sling is fixed to the main body. The position of the lower end of the second sling connected to the main body is lower than that of the support mechanism. A tension sensor is connected to the second sling, which can measure the tension of the second sling. The tension of the second sling can be used to determine whether the stress on the main body meets the conditions. It can withstand the stress when the support mechanism is subjected to the upward support force of the inner annular weld, serving as a second layer of stress guarantee. This improves the safety of the working facility 8 when the main body is rising and when the inner annular weld between the installed steel pipe and the steel pipe to be installed is fully welded. The second sling can be extended and shortened by the second lifting mechanism. The extension or shortening of the second sling can be adjusted according to the measurement results of the tension sensor to change the stress.

[0048] In this embodiment, the number of cables connecting the first sling 71 and the second sling 72 can be selected according to actual stress requirements. The main body 1 has at least three support mechanisms 2 distributed circumferentially, such as... Figure 1-7 As shown, all support mechanisms 2 are evenly distributed around the circumference of the main body 1, that is, the eccentric angles of two adjacent support mechanisms 2 about the center of the main body 1 are equal.

[0049] like Figures 1-19As shown, the longitudinal section of the end of the support mechanism 2 on the side away from the center of the main body is rectangular or wedge-shaped. It is only necessary that the end of the support mechanism extends into the inner circumferential weld between the upper and lower steel pipes without affecting the contact between the pipe openings of the upper and lower steel pipes, and can ensure that the working facility 8 below provides stable force.

[0050] The wedge shape can be triangular or trapezoidal, etc. For example... Figures 8-19 As shown, there is an inner circumferential weld 53 and / or an outer circumferential weld between adjacent pipe ends of the upper and lower steel pipes. This application mainly relates to the inner circumferential weld 53, such as... Figure 9 As shown. And from Figure 8 and Figure 9 As shown, the inner annular weld 53 can have an upper bevel 51 and a second lower plane 52. Suitablely, the upper part of the end of the support mechanism 2 is a first upper inclined surface 21 and the lower part is a first lower plane 22. Under the same conditions, this shape has stronger supporting capacity; Figures 10-11 As shown, the inner circumferential weld 53 can have a second upper plane and a lower bevel 51. Suitablely, the upper part of the end of the support mechanism 2 is a first upper plane and the lower part is a first lower bevel 23. Under the same conditions, this shape has stronger supporting capacity; Figures 12-13 as well as Figures 16-19 As shown, the inner circumferential weld 53 can have upper and lower bevels 51. For example... Figures 12-13 As shown, the upper part of the end of the support mechanism 2 is a first upper plane, and the lower part is a first lower inclined surface 23. It does not fully utilize the space of the inner annular weld 53, thus reducing costs while meeting the support capacity requirements; as shown... Figures 14-17 As shown, the upper part of the end of the support mechanism 2 is a first upper inclined surface 21, and the lower part is a first lower inclined surface 23. The first upper inclined surface 21 is adapted to the upper bevel 51 of the inner annular weld 53, and the second lower inclined surface 23 is adapted to the lower bevel 51 of the inner annular weld 53. This fully utilizes the space of the inner annular weld 53, and under the same conditions, this shape has stronger supporting capacity. Figures 18-19 As shown, the longitudinal section of the end of the support mechanism 2 can also be rectangular, that is, the upper part of the end of the support mechanism 2 is the first upper plane and the lower part is the first lower plane 22, which can also meet the support capacity requirements. Figures 8-19 The three types of inner circumferential welds, the longitudinal section of the end of the support mechanism 2 on the side away from the center of the main body can be adopted. Figures 8-17 The wedge shape in the middle can also be adopted Figures 18-19The rectangle in the middle. When the inner annular weld between the pipe ends of the upper and lower steel pipes is k-shaped or V-shaped, the height of the end of the support mechanism on the side away from the center of the main body is less than the height of the side closer to the center of the main body. The longitudinal section of the end of the support mechanism on the side away from the center of the main body is wedge-shaped, which can make the volume of the end of the support mechanism entering the inner annular weld larger, thereby improving the support capacity; and by adjusting the distance of the support mechanism relative to the center of the main body through the telescopic mechanism, the support position between the first upper inclined surface and / or the first lower inclined surface of the end of the support mechanism and the inner annular weld bevel can be changed, thereby locally adjusting the height of the upper steel pipe and adjusting the flatness of the joint between the upper and lower steel pipes.

[0051] like Figure 8 In the middle, the right end of the support mechanism 2 on the right side is the end, and its left side height is greater than its right side height, forming the first upper inclined surface 21; the first upper inclined surface can just extend into the inner annular weld 53 formed by the bevel 51 at the bottom of the steel pipe 5 to be installed and the second lower plane 52 at the top of the installed steel pipe 5, so that the support mechanism 2 can be used as a fixing structure for the steel pipe end fixing device, and also as a vertical lifting adjustment mechanism when the steel pipe 5 ends are not level.

[0052] In an optional embodiment, the inclination angle of the first upper inclined surface 21 at the end of the support mechanism 2 is less than or equal to the angle of the minimum upper bevel 51 of the steel pipe 5 weld, so that the support mechanism 2 can extend a longer length into the circumferential weld, resulting in better support capacity. Figures 8-9 As shown, the inclination angle of the first upper inclined surface 21 at the end of the support mechanism 2 is equal to the angle of the welded upper bevel 51 of the steel pipe 5, thereby making the first upper inclined surface 21 at the end of the support mechanism 2 parallel to the inclined surface of the upper bevel 51. Further, if the inclination angle of the first upper inclined surface 21 at the end of the support mechanism 2 is less than or equal to 60°, it provides a greater vertical force and a better vertical support effect.

[0053] Each of the support mechanisms 2 is provided with a corresponding retractable mechanism 3, the retractable mechanism 3 being used to adjust the distance of the support mechanism 2 relative to the center of the main body 1, such as... Figure 5 As shown, the telescopic mechanism 3 is arranged perpendicular to the inner wall of the steel pipe 5, as follows: Figure 3 In the middle, the retractable mechanism 3 corresponding to the left support mechanism 2 can change the position of the left support mechanism 2 in the left and right directions.

[0054] In an optional embodiment, the telescopic mechanism 3 may be a hydraulic cylinder 31, a jack, an electric push rod, or an electric screw.

[0055] like Figure 3As shown, when the telescopic mechanism 3 uses a hydraulic cylinder 31, the main body 1 is provided with a support guide rail 4 corresponding to the support mechanism 2 in the circumferential direction. The support guide rail 4 is arranged radially along the main body 1. The support mechanism 2 is slidably disposed on the support guide rail 4. The support guide rail 4 guides the support mechanism 2, which is beneficial for the end of the support mechanism 2 to quickly extend into or out of the annular weld. In an optional embodiment, the supporting guide rail 4 is a guide rod, and the supporting mechanism 2 is sleeved on the outside of the guide rod; in another optional embodiment, the supporting guide rail 4 is a guide sleeve, and the supporting mechanism 2 is sleeved on the outside of the guide sleeve, or the guide sleeve is sleeved on the outside of the supporting mechanism 2. Both of these methods, through the sleeved arrangement, can better restrict the supporting mechanism 2 and improve the supporting capacity of the steel pipe end fixing device. Furthermore, the telescopic mechanism 3 can be installed inside or outside the guide sleeve by a hinge, such as... Figure 1 As shown, the telescopic mechanism 3 is installed on the outside of the guide sleeve. Furthermore, the cross-sections of the guide rod, the guide sleeve, and the support mechanism 2 are all square to prevent the support mechanism 2 from rotating and reduce the possibility of the support mechanism 2 swaying along its axis, thereby improving the support capacity of the steel pipe end fixing device.

[0056] One end of the hydraulic cylinder 31 is connected to the main body 1, and the other end is hinged to the support mechanism 2. The hinge axis 41 of the hydraulic cylinder 31 and the support mechanism 2 is perpendicular to both the stroke direction of the hydraulic cylinder 31 and the axial direction of the main body 1. The hydraulic cylinder 31 is hinged to the support mechanism 2, allowing the support mechanism 2 to rotate up and down. However, due to the constraint of the support guide rail 4, the angle of rotation of the support mechanism 2 is small, which does not affect the supporting capacity of the steel pipe end fixing device, but ensures that the supporting force is essentially not applied to the hydraulic cylinder 31, reducing the possibility of damage to the hydraulic cylinder 31. Figure 3 As shown, the hydraulic cylinder 31 is also connected to the main body 1 by a hinge shaft 41, and the direction of the hinge shaft 41 is perpendicular to both the stroke direction of the hydraulic cylinder 31 and the axial direction of the main body 1. Figure 3 (Vertical center).

[0057] When using the steel pipe end fixing device, the working equipment can be directly connected to the connection point at the bottom of the main body of the steel pipe end fixing device. Then, the working equipment and the steel pipe end fixing device can be hoisted as a whole to the top end of the installed steel pipe 5 in the vertical shaft by connecting the first hoisting cable of the first lifting mechanism at the wellhead to the lifting point at the top of the main body. The support mechanism 2 is extended out by the telescopic mechanism 3 and placed on the inner annular weld of the top end of the installed steel pipe 5. This allows the steel pipe end fixing device to be clamped by the support mechanism 2 in the inner annular weld between the adjacent ends of the upper and lower steel pipes, and supported by the inner side of the second lower plane 52 or the second lower inclined plane 23 of the top end of the installed steel pipe 5.

[0058] like Figure 23 As shown, the second sling 72 is connected to a tension sensor 62, which can measure the tension of the second sling 72; the support mechanism 2 is equipped with a distance sensor 61, which is used to measure the length of the support mechanism 2 extending into the inner annular weld 53 between the two steel pipe sections 5; by measuring the length of the support mechanism 2 extending into the inner annular weld 53 between the two steel pipe sections 5 by the distance sensor 61, it can be determined whether the suspension capacity of the working facility 8 below meets the requirements, thereby ensuring operational safety; by measuring the tension of the second sling 72 by the tension sensor 62, it can be determined whether the end of the support mechanism 2 can be removed from the inner annular weld 53, thereby ensuring operational safety; that is, at least one of the measurement results of the tension sensor 62 and the distance sensor 61 needs to meet the requirements to ensure that the force on the working facility 8 always meets the standard.

[0059] The pipe end fixing device provided in this solution effectively utilizes the space of the inner annular weld seam 53 between adjacent pipe ends of the upper and lower steel pipes 5. The support mechanism 2 installed on the device can extend into the inner annular weld seam 53 without affecting the connection between the upper and lower steel pipes 5. By locking the support mechanism 2 into the inner annular weld seam 53, it can serve as an additional fixing device for construction platforms and other operating facilities without affecting the alignment of the two pipe ends. The process is simple and requires no multiple adjustments. When the end of the support mechanism 2 is wedge-shaped, the vertical height of the upper steel pipe 5 to be installed can be locally adjusted by extending and retracting the support mechanism 2, thus facilitating fine-tuning of the flatness when the pipe ends of the steel pipes 5 are connected. At the same time, the device does not require welding for fixing, reducing manual labor intensity and the impact of welding on the pipe wall.

[0060] Example 2 A method for using a steel pipe end fixing device includes the following steps: S1: Hoist or lower the steel pipe 5 to be installed (upper steel pipe) to the position of the top opening of the already installed steel pipe 5, so that the bottom opening of the steel pipe 5 to be installed contacts the top opening of the already installed steel pipe 5, and the end of the support mechanism is located between the inner annular weld 53 between the bottom opening of the steel pipe 5 to be installed and the top opening of the already installed steel pipe 5, such as... Figure 4 and Figure 9 As shown, complete the connection between the bottom end of the steel pipe 5 to be installed and the top end of the steel pipe 5 already installed; When constructing in an inclined shaft, due to the slope of the inclined shaft, steel pipe sections are generally placed on a transport trolley or steel sliding plate, and connected to the transport trolley or steel sliding plate by cables, or connected to the steel pipe sections by cables, and the steel pipe sections are slowly lowered to the designated position in the inclined shaft.

[0061] When constructing in a vertical shaft, the steel pipe 5 to be installed (upper steel pipe) can be directly hoisted to the top pipe opening position of the already installed steel pipe 5 using the first hoisting sling; In the first instance of using the steel pipe end fixing device, the steel pipe end fixing device described in Example 1 is used to temporarily fix the top end position of the first section of steel pipe to be installed. At the same time, the working facility can be connected to the connection point at the bottom of the main body. Then, the first section of steel pipe to be installed is hoisted or lowered to the bottom of the vertical shaft or inclined shaft for installation to form the first section of installed steel pipe. The lower end of the support mechanism of the steel pipe end fixing device overlaps the inner side of the second lower plane of the top end of the first section of installed steel pipe or the inner circumferential weld bevel slope.

[0062] During shaft construction, the first hoisting cable 71 of the first lifting mechanism at the shaft opening can be connected to the lifting point at the top of the main body of the steel pipe opening fixing device. Simultaneously, the working equipment can be connected to the connection point at the bottom of the main body. Then, by releasing the first hoisting cable 71 through the first lifting mechanism at the shaft opening, the steel pipe opening fixing device and the working equipment are lowered together until the steel pipe opening fixing device is hoisted to the top opening position of the installed steel pipe 5 (lower steel pipe) inside the shaft. The lower end of the support mechanism 2 of the steel pipe opening fixing device then overlaps with the inner side of the second lower plane 52 of the top opening of the installed steel pipe 5 or the inclined surface of the inner circumferential weld bevel 51. Figure 20 As shown.

[0063] In the optional implementation method during shaft construction, in step S1, the first sling connected to the lifting point at the top of the main body of the steel pipe end fixing device is first replaced to the steel pipe 5 to be installed. Then, the steel pipe 5 to be installed is hoisted to the top pipe end position of the already installed steel pipe 5, so that the end of the support mechanism 2 is located between the inner side below the bottom pipe end of the steel pipe 5 to be installed and the inner side above the top pipe end of the already installed steel pipe 5. Then, the steel pipe 5 to be installed is lowered further so that the pipe ends of the two sections of steel pipe 5 come into contact, and the circumferential weld of the two sections of steel pipe 5 is joined. Figure 21 As shown.

[0064] In the construction of the inclined shaft, in an optional implementation, in step S1, the steel pipe 5 to be installed is lowered to the top opening of the installed steel pipe 5, so that the end of the support mechanism 2 is located between the inner side below the bottom opening of the steel pipe 5 to be installed and the inner side above the top opening of the installed steel pipe 5. Then, the steel pipe 5 to be installed is lowered further so that the openings of the two sections of steel pipe 5 come into contact and the circumferential weld of the two sections of steel pipe 5 is joined. S2: Position welding of the inner annular weld 53 between the bottom opening of the steel pipe 5 to be installed and the top opening of the installed steel pipe 5 is performed above the working facility 8; the height of the working facility 8 relative to the steel pipe opening fixing device can be adjusted, such as by setting a lifting mechanism, so as to facilitate the conversion between the inner annular weld 53 between the bottom opening of the steel pipe 5 to be installed and the top opening of the installed steel pipe 5 before subsequent positioning welding and full welding. S3: The steel pipe end fixing device and the working facility 8 are hoisted together by the lifting device, and then the end of the support mechanism 2 is retracted into the steel pipe 2 by the telescopic mechanism 3. During the construction of vertical and inclined shafts, in step S3, such as Figure 22 As shown, the main body of the steel pipe opening fixing device can be connected to the top of the spot-welded steel pipe 5 by the second sling 72 and the second lifting mechanism. The position of the lower end of the second sling 72 connected to the main body is lower than the support mechanism. The second sling 72 is equipped with a tension measuring device, which can be a tension sensor. During the shaft construction process, in step S3, such as Figure 23 As shown, the first sling of the first lifting mechanism can also be removed from the steel pipe 5 to be installed and connected to the lifting point of the main body of the steel pipe opening fixing device, so as to lift the steel pipe opening fixing device and the working facility together. During the construction of vertical and inclined shafts, in step S3, the lifting force provided by the second sling to the steel pipe end fixing device and the working facility is measured by a tension measuring device to determine whether it meets the requirements. If it meets the requirements, it means that the steel pipe end fixing device and the working facility 8 are hoisted together, and the end of the support mechanism is retracted into the steel pipe using a telescopic mechanism. If it does not meet the requirements, it means that the steel pipe end fixing device and the working facility 8 are not hoisted together, and retracting the end of the support mechanism into the steel pipe using a telescopic mechanism may cause construction hazards. Therefore, it is necessary to increase the lifting force provided by the second sling to the steel pipe end fixing device and the working facility until it meets the requirements, and then retract the end of the support mechanism into the steel pipe using a telescopic mechanism. The lifting weight data is obtained by measuring the lifting weight data, and the lifting and fixing status is obtained by measuring the lifting weight data. S4: The main body 1 and the working facility 8 are lifted together by the lifting device to the end of the support mechanism 2, aligning with the top opening of the steel pipe 5 to be installed. During vertical shaft construction, the lifting device can be any one or both of the first and second lifting mechanisms. During inclined shaft construction, since the first lifting mechanism and the first sling are inconvenient to set up, and inclined shaft hoisting is inconvenient, the first lifting mechanism and the first sling can be omitted, and only the second lifting mechanism and the second sling can be set up. The main body 1 and the working facility 8 are lifted together by the second lifting mechanism and the second sling to the end of the support mechanism 2, aligning with the top opening of the steel pipe 5 to be installed. Then, the end of the support mechanism 2 is extended using the telescopic mechanism 3, such as... Figure 24As shown, the lower end of the support mechanism 2 of the steel pipe nozzle fixing device overlaps on the inner side of the second lower plane 52 of the top nozzle of the steel pipe 5 to be installed or on the inclined surface of the lower bevel 51 of the inner circumferential weld 53. In step S4, the main body and working facilities are lifted together by the lifting device until the end of the support mechanism is aligned with the top opening of the steel pipe to be installed. Then, the end of the support mechanism is extended using the telescopic mechanism. The distance of the extended end of the support mechanism is detected by the distance detection device to determine whether the extended distance meets the requirements. If the requirements are met, it means that the support is stable and subsequent operations can be carried out. If the requirements are not met, the end of the support mechanism is extended further using the telescopic mechanism until the requirements are met.

[0065] After step S4, the inner circumferential weld between the bottom end of the steel pipe to be installed and the top end of the already installed steel pipe is fully welded using the work equipment. The installation of the steel pipe to be installed is then complete, meaning the assembly of the bottom end of the steel pipe to be installed and the top end of the already installed steel pipe is finished. For example... Figures 24-25 As shown, the height of the working facility 8 relative to the steel pipe end fixing device can be adjusted, for example, by setting up a lifting mechanism, so that the height position of the working facility relative to the inner annular weld 53 between the top end of the installed steel pipe 5 can be adjusted. When the working facility 8 is used to fully weld the inner annular weld 53 between the bottom end of the steel pipe to be installed and the top end of the installed steel pipe, it can also be fixed by a second sling 72 for double protection.

[0066] After step S4, when the current steel pipe to be installed has been installed, the installed steel pipe is used as the new installed steel pipe for the installation of the next section of steel pipe. Figure 25 If another section of steel pipe is installed on top of the upper steel pipe 5, then steps S1-S4 are repeated to achieve cyclic construction.

[0067] Using the above-described method for fixing the steel pipe end, the top end of the already installed steel pipe 5 is used to support the fixing device. This does not affect the connection between the bottom end of the steel pipe 5 to be installed and the top end of the already installed steel pipe 5. As shown in step S1, when the lower end of the support mechanism of the fixing device is placed inside the upper end of the already installed steel pipe 5, it does not affect the lowering of the steel pipe 5 to be installed and the connection of the upper and lower steel pipe ends, nor the formation of the circumferential weld. This allows the steel pipe end to be used... The fixing device erection operation facility 8 first performs a positioning weld between the bottom pipe opening of the steel pipe 5 to be installed and the top pipe opening of the already installed steel pipe 5. The steel pipe opening fixing device and operation facility 8 can be moved up to the inner side of the top pipe opening of the steel pipe 5 to be installed by the lifting device and provide support again. Therefore, the inner circumferential weld 53 between the bottom pipe opening of the steel pipe 5 to be installed and the top pipe opening of the already installed steel pipe 5 can be fully welded using the steel pipe opening fixing device and operation facility 8. This method is not affected by the butt joint of the steel pipes 5 and the process is simpler. In an optional embodiment, when the end of the support mechanism has a first upper inclined surface 21, between steps S1 and S2, if there is an unevenness after the pipe ends are connected, the support mechanism 2 can be extended or retracted using the telescopic mechanism 3 to change the support position of the first upper inclined surface 21 at the end of the support mechanism 2 and the upper slope of the bottom pipe opening of the steel pipe 5 to be installed, and locally adjust the height of the bottom pipe opening of the steel pipe 5 to be installed, so that the adjacent pipe openings of the two steel pipe sections 5 are connected smoothly.

[0068] In an optional embodiment, when the end of the support mechanism has a first lower slope 23, between steps S1 and S2, if there is unevenness after the pipe ends are connected, the support mechanism 2 can be extended or retracted using the telescopic mechanism 3 to change the support position of the first lower slope 23 at the end of the support mechanism 2 and the lower slope of the top pipe end of the installed steel pipe 5, and locally adjust the height of the bottom pipe end of the steel pipe 5 to be installed, so that the adjacent pipe ends of the two steel pipes 5 are connected smoothly.

[0069] When the next section of steel pipe 5 is hoisted or lowered into place, the extension of the support mechanism 2 is finely adjusted using the telescopic mechanism 3. This ensures that the inclined surface of the support mechanism 2 is positioned precisely within the bevel gap of the inner circumferential weld 53 of the two sections of steel pipe 5, without affecting the butt joint of the two sections. At this point, the steel pipe 5 can be lowered further to bring the two sections into contact and perform the butt joint of the circumferential weld. After the butt joint, if there is any unevenness, the support mechanism 2 can be extended or retracted using the telescopic mechanism 3 to locally adjust the height of the steel pipe 5 butt joint, facilitating a level butt joint between the two sections. After the butt joint is completed, the steel pipe 5 to be installed can be tack welded to the already installed steel pipe 5. Then, the steel pipe butt fixing device can be raised to the top butt position of the steel pipe 5 to be installed and secured to the butt joint, allowing for subsequent welding of the steel pipe 5, while awaiting the hoisting or lowering of the next section of steel pipe for installation.

[0070] As can be seen from the above, during the construction of the vertical shaft, the lowering of the steel pipe to be installed, the lifting of the steel pipe opening fixing device, and the lifting of the working facility 8 can all be powered by the same first lifting mechanism. The conversion can be achieved by changing the lifting point to complete the construction. The required equipment cost is lower, and it can meet the operational needs and reduce the risk of operational interference within the limited space of the inclined shaft opening.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A steel pipe end fixing device, characterized in that, include: The main body has an axis and at least three support mechanisms are distributed circumferentially on the main body. The main body can be used to install working facilities. The telescopic mechanism is provided in each of the support mechanisms. The telescopic mechanism is used to adjust the distance of the support mechanism relative to the center of the main body. The telescopic mechanism can adjust the end of the support mechanism to extend into the inner circumferential weld between the two steel pipe sections that are joined together. The lifting device is capable of lifting the main body from the inner annular weld between the two steel pipe sections to the top surface of the upper steel pipe.

2. The steel pipe end fixing device according to claim 1, characterized in that, The longitudinal section of the end of the support mechanism on the side furthest from the center of the main body is rectangular or wedge-shaped.

3. The steel pipe end fixing device according to claim 2, characterized in that, The longitudinal section of the end of the support mechanism away from the center of the main body is wedge-shaped, and the height of the end of the support mechanism away from the center of the main body is less than the height of the end of the support mechanism closer to the center of the main body. The upper part of the end of the support mechanism is a first upper inclined surface and the lower part is a first lower plane or a first lower inclined surface, or the upper part of the end of the support mechanism is a first upper plane and the lower part is a first lower inclined surface.

4. The steel pipe end fixing device according to claim 1, characterized in that, The retractable mechanism uses a hydraulic cylinder, jack, electric push rod, or electric screw.

5. A steel pipe end fixing device according to claim 4, characterized in that, When the telescopic mechanism uses a hydraulic cylinder, the main body is provided with a support guide rail corresponding to the support mechanism in the circumferential direction. The support guide rail is arranged radially along the main body. The support mechanism is slidably disposed on the support guide rail. One end of the hydraulic cylinder is connected to the main body, and the other end is hinged to the support mechanism. The hinge axis of the hydraulic cylinder and the support mechanism is perpendicular to both the stroke direction of the hydraulic cylinder and the axial direction of the main body.

6. A steel pipe end fixing device according to any one of claims 1-5, characterized in that, The lifting device includes a first lifting mechanism above the upper steel pipe. The first lifting mechanism can be connected to the main body via a first sling. The first lifting mechanism can control the extension and retraction of the first sling. And / or, The lifting device includes a second lifting mechanism, which is provided with a second sling. The second lifting mechanism can control the extension and shortening of the second sling. The second lifting mechanism and the second sling can be used together to connect the upper steel pipe and the main body. The position where the second lifting mechanism and the second sling are used together to connect the main body is lower than the support mechanism.

7. A steel pipe end fixing device according to claim 6, characterized in that, The upper part of the main body is provided with at least two lifting points, and the first sling can be connected to the lifting points; The lower part of the main body is provided with multiple sets of connection points, which are used to connect the working facilities or the second sling.

8. A steel pipe end fixing device according to claim 6, characterized in that, When the lifting device includes a second lifting mechanism, the second sling is connected to a tension sensor, which is capable of measuring the tension of the second sling; The support mechanism is equipped with a distance sensor, which is used to measure the length of the support mechanism extending into the inner annular weld between the two steel pipe sections that are joined together.

9. A method of using a fixing device, characterized in that, Includes the following steps: S1: Hoist or slide the steel pipe to be installed to the top opening position of the installed steel pipe, so that the bottom opening of the steel pipe to be installed contacts the top opening of the installed steel pipe, and the end of the support mechanism of the steel pipe opening fixing device according to any one of claims 1-7 is located between the inner annular weld between the bottom opening of the steel pipe to be installed and the top opening of the installed steel pipe, thereby completing the docking of the bottom opening of the steel pipe to be installed and the top opening of the installed steel pipe. S2: Position welding of the inner circumferential weld between the bottom end of the steel pipe to be installed and the top end of the installed steel pipe is carried out above the working facility erected below the steel pipe end fixing device. S3: The steel pipe end fixing device and the working equipment are hoisted and stabilized together by the lifting device, and then the end of the support mechanism is retracted into the steel pipe by the telescopic mechanism. S4: The main body and working facilities are lifted together by the lifting device until the end of the support mechanism is aligned with the top opening of the steel pipe to be installed. The end of the support mechanism is extended by the telescopic mechanism so that the lower part of the end of the support mechanism of the steel pipe opening fixing device overlaps the inner side of the second lower plane of the top opening of the steel pipe to be installed or the lower bevel surface of the inner circumferential weld.

10. The method of using the steel pipe end fixing device according to claim 9, characterized in that, After step S4, when the current steel pipe to be installed has been installed, and the installed steel pipe is used as the new installed steel pipe to install the next section of steel pipe, then steps S1-S4 are repeated.

11. The method of using the steel pipe end fixing device according to claim 10, characterized in that, After step S4, the inner circumferential weld between the bottom end of the steel pipe to be installed and the top end of the already installed steel pipe is fully welded using the working equipment, and the installation of the steel pipe to be installed is completed.

12. The method of using the steel pipe end fixing device according to claim 9, characterized in that, Before step S1, the pipe end fixing device as described in any one of claims 1-7 is used to temporarily fix the top pipe end position of the first section of steel pipe to be installed. Then, the first section of steel pipe to be installed is hoisted or lowered to the bottom of the vertical shaft or inclined shaft for installation to form the first section of installed steel pipe. The lower end of the support mechanism of the pipe end fixing device overlaps the inner side of the second lower plane of the top pipe end of the first section of installed steel pipe or the inner circumferential weld bevel slope.

13. The method of using the steel pipe end fixing device according to claim 9, characterized in that, When the end of the support mechanism has a first upper slope, between steps S1 and S2, if there is unevenness after the pipe ends are connected, the support mechanism is extended or retracted using a telescopic mechanism to change the support position of the first upper slope at the end of the support mechanism and the inner slope of the bottom pipe opening of the steel pipe to be installed, and locally adjust the height of the bottom pipe opening of the steel pipe to be installed so that the adjacent pipe openings of the two steel pipes are connected smoothly.

14. A method of using a fixing device according to any one of claims 9-13, characterized in that, In step S3, the main body of the steel pipe end fixing device is connected to the spot-welded steel pipe to be installed by the second lifting mechanism and the second sling together. The position of the main body connected by the second lifting mechanism and the second sling is lower than that of the support mechanism. The second sling is equipped with a tension measuring device. The steel pipe end fixing device and the working facility are hoisted together by the first sling of the first lifting mechanism. The first lifting mechanism is located above the steel pipe to be installed. The first lifting mechanism can control the extension and retraction of the first sling. The tension measuring device measures whether the lifting force provided by the second sling to the steel pipe end fixing device and working facility meets the requirements. If it does, the end of the support mechanism is retracted into the steel pipe using the telescopic mechanism. If it does not meet the requirements, the length of the second sling is shortened by the second lifting mechanism to increase the lifting force provided by the second sling to the steel pipe end fixing device and working facility until the requirements are met. Then, the end of the support mechanism is retracted into the steel pipe using the telescopic mechanism.

15. A method of using a fixing device according to claim 9, characterized in that, In step S4, the main body and working facilities are lifted together by the lifting device until the end of the support mechanism is aligned with the top opening of the steel pipe to be installed. Then, the end of the support mechanism is extended using the telescopic mechanism. The distance of the extended end of the support mechanism is detected by the distance detection device and it is determined whether the extended distance meets the requirements. If it does not meet the requirements, the end of the support mechanism is extended further using the telescopic mechanism until the requirements are met.

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