A device and method for installing pressure steel pipes in deep shafts of hydropower stations

Abstract

The present invention provides an installation device and method for pressure steel pipes in a deep vertical shaft of a hydropower station. The pressure steel pipes are welded and installed in the deep vertical shaft by a manned cage, which greatly improves the installation efficiency of the pressure steel pipes and avoids the need to continuously install and remove supporting platforms for auxiliary pressure steel pipe installation while installing the pressure steel pipes. The lifting mechanism can lift the manned cage in the deep vertical shaft as a whole. The manned cage includes a hanging mechanism, a fixed installation mechanism and a welding mechanism. The welding mechanism, the fixed installation mechanism and the welding mechanism are fixedly connected by a number of pillars, which improves the installation stability of the manned cage. The manned cage in the present invention has a simple structure, requires a single material, is easy and quick to manufacture, has strong operability and practicality, effectively ensures the installation efficiency of the pressure steel pipes, and thus reduces the installation cost.

Description

Technical Field

[0001] The invention relates to the technical field of deep well pressure steel pipe installation, and in particular to an installation device and method for a pressure steel pipe in a deep vertical shaft of a hydropower station. Background Art

[0002] During the installation and construction of deep shaft penstocks in hydropower stations, the penstock installation adopts the method of welding the support platform on the inner wall of the penstock. Not only will it cause great damage to the penstock base material, but the support platform must be continuously dismantled and installed as the penstock is installed. On the one hand, installing the support platform inside the shaft penstock takes a long time and wastes construction period. On the other hand, the safety factor for installation and dismantling of the support platform in the deep shaft is low. Furthermore, the method of welding the support platform on the inner wall of the penstock results in a large loss of materials. In the process of continuous dismantling and installation, it is necessary to continuously add the lap material of the support platform, which reduces the efficiency of penstock installation and greatly increases the construction cost. Summary of the invention

[0003] In view of the problem that in the installation of penstocks in deep shafts of hydropower stations in the prior art, supporting platforms for auxiliary penstock installation need to be constantly installed and removed, which wastes construction time, the present invention provides an installation device and method for penstocks in deep shafts of hydropower stations, which reduces the installation process of supporting platforms, improves the safety factor of penstock installation, and has strong practicality, effectively ensuring the efficiency of penstock installation in deep shafts, thereby reducing production costs.

[0004] The present invention is achieved through the following technical solutions:

[0005] A device for installing a pressure steel pipe in a deep shaft of a hydropower station comprises a manned cage connected to a lifting mechanism of a hoisting mechanism and suspended in the deep shaft to install the pressure steel pipe; the manned cage comprises a hanging mechanism, a fixed installation mechanism and a welding mechanism; the hanging mechanism, the fixed installation mechanism and the welding mechanism are fixedly connected by a plurality of pillars, the hanging mechanism is connected to the lifting mechanism of the hoisting mechanism, and is constructed and installed in the pressure steel pipe of the deep shaft through the lifting mechanism, and the fixed installation mechanism is fixedly suspended on the pressure steel pipe after the pressure steel pipe is installed, and is used for stable construction of the manned cage in the pressure steel pipe.

[0006] Preferably, the manned cage is a cylindrical structure.

[0007] Preferably, the welding mechanism, the fixing and mounting mechanism and the welding mechanism are coaxially arranged and a ladder is provided between them.

[0008] Preferably, a plurality of pillars are arranged in parallel, and a plurality of balancing rods are provided between the plurality of pillars and along the long direction of the pillars.

[0009] Preferably, the suspension mechanism includes a suspension platform and a plurality of suspension rings; the plurality of suspension rings are fixedly welded to the top of the suspension platform, and the lifting mechanism of the hoisting mechanism is hung on the suspension rings.

[0010] Preferably, the fixed installation mechanism includes a mounting platform and a plurality of hooks; the fixed ends of the plurality of hooks are all arranged on the mounting platform, and the hanging ends are all hung on the pressure steel pipe.

[0011] Preferably, the welding mechanism comprises a manned welding construction table and a welding construction platform, wherein the welding construction platform and the manned welding construction platform are respectively fixed on pillars, and the manned welding construction platform is arranged below the welding construction platform along the pillars.

[0012] Furthermore, guardrails are provided along the sides of the manned welding construction platform.

[0013] A method for installing a pressure steel pipe in a deep vertical shaft of a hydropower station, based on the above-mentioned installation equipment, comprises the following steps:

[0014] The lifting mechanism of the hoisting mechanism pulls the manned cage for use, and lifts the manned cage and the first layer of pressure steel pipe in parallel and lowers them into the deep shaft; after the lifting mechanism places the manned cage and the first layer of pressure steel pipe in the deep shaft, the lifting mechanism unloads the manned cage and the first layer of pressure steel pipe and lifts and assembles the second layer of pressure steel pipe, the second layer of pressure steel pipe enters the deep shaft through the lifting mechanism and descends, the pipe mouth of the second layer of pressure steel pipe passes through the manned cage and is superimposed on the first layer of pressure steel pipe, and the operator welds the two pressure steel pipes on the welding mechanism;

[0015] The lifting mechanism stacks the pressure steel pipes in sequence in the deep vertical shaft. When the stacking height of the pressure steel pipes is higher than the manned cage, the fixed installation mechanism of the manned cage is suspended on the pipe mouth of the uppermost pressure steel pipe for stable suspension by the operator, and then the operator continues the welding construction; while the lifting mechanism stacks and unloads the pressure steel pipes, the operator connects the lifting mechanism to the hanging mechanism and then lifts and lowers. While the lifting mechanism cyclically unloads the pressure steel pipes in the deep vertical shaft, it is connected to the manned cage for lifting work until the welding of the pressure steel pipes in the deep vertical shaft is completed and the work is completed.

[0016] Preferably, the manned cage is formed by welding an H-shaped steel group.

[0017] Compared with the prior art, the present invention has the following beneficial technical effects:

[0018] The present invention provides an installation device for pressure steel pipes in deep vertical shafts of hydropower stations. The pressure steel pipes are welded and installed in the deep vertical shafts by a manned cage, which greatly improves the installation efficiency of the pressure steel pipes and avoids the need to continuously install and remove supporting platforms for auxiliary pressure steel pipe installation while installing the pressure steel pipes. The lifting mechanism can lift the manned cage in the deep vertical shaft as a whole. The manned cage includes a hanging mechanism, a fixed installation mechanism and a welding mechanism. The welding mechanism, the fixed installation mechanism and the welding mechanism are fixedly connected by a number of pillars, which improves the installation stability of the manned cage. The manned cage in the present invention has a simple structure, requires a single material, is easy and quick to manufacture, has strong operability and practicality, effectively ensures the installation efficiency of the pressure steel pipes, and thus reduces the installation cost.

[0019] Furthermore, the manned cage is a cylindrical structure, which facilitates lowering the manned cage into a deep shaft.

[0020] Furthermore, the welding mechanism, the fixed installation mechanism and the welding mechanism are coaxially arranged and a ladder is arranged between them. The arrangement of the ladder facilitates the operator to perform lifting activities on the manned cage. The operator can selectively enter each mechanism for construction according to the construction situation, thereby improving the flexibility of construction in the manned cage.

[0021] Furthermore, a plurality of pillars are arranged in parallel, and a plurality of balancing rods are arranged between the plurality of pillars and along the long direction of the pillars, thereby increasing the stability between the pillars and improving the safety of the construction.

[0022] Furthermore, the suspension mechanism includes a suspension platform and several suspension rings; the several suspension rings are fixedly welded to the top of the suspension platform, the lifting mechanism of the lifting mechanism is hung on the suspension rings, and the manned cage is connected to the lifting mechanism through the suspension mechanism, which is convenient for lifting and lowering the manned cage in a deep vertical shaft.

[0023] Furthermore, the fixed installation mechanism includes a mounting platform and a plurality of hooks; the fixed ends of the plurality of hooks are all arranged on the mounting platform, and the hanging ends are all hung on the pressure steel pipe. The manned cage is fixedly hung on the pressure steel pipe through the fixed installation mechanism after the pressure steel pipe is installed, thereby increasing the construction stability of the manned cage in a deep shaft.

[0024] Furthermore, the welding mechanism includes a manned welding construction table and a welding construction platform. The welding construction platform and the manned welding construction platform are respectively fixed on the pillars, and the manned welding construction platform is arranged along the pillars under the welding construction platform. The manned cage installs and welds the installed pressure steel pipe through the welding mechanism, thereby improving the installation efficiency of the pressure steel pipe.

[0025] Furthermore, guardrails are provided along the sides of the manned welding construction platform to improve the safety protection for operators.

[0026] A method for installing a pressure steel pipe in a deep vertical shaft of a hydropower station. The manned cage is used in the pressure steel pipe installation application, which not only reduces the damage to the pressure steel pipe base material caused by welding a support platform on the inner wall of the pressure steel pipe, but also greatly reduces the need to continuously remove and install the support platform as the pressure steel pipe is installed, thereby saving a lot of construction time and improving construction efficiency.

[0027] Furthermore, the manned cage 1 is formed by welding an H-shaped steel group, which improves the reliability of the construction and use of the manned cage. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the manned cage structure of the present invention;

[0029] Figure 2 It is a structural schematic diagram of the manned cage in the present invention during the construction process.

[0030] In the figure: 1- manned cage; 2- hanging platform; 3- pillar; 4- installation platform; 5- balance support rod; 6- welding construction platform; 7- guardrail; 8- manned welding construction platform; 9- ladder; 10- hanging ring; 11- hook; 12- pressure steel pipe; 13- lifting ear; 14- lifting mechanism. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below in conjunction with specific embodiments, which are intended to explain the present invention rather than to limit it.

[0032] The present invention provides an installation device for pressure steel pipes in deep shafts of hydropower stations, such as Figure 1 As shown, it includes a manned cage 1 connected to the lifting mechanism of the hoisting mechanism 14 and suspended in a deep vertical shaft to install a pressure steel pipe 12; the manned cage 1 includes a hanging mechanism, a fixed installation mechanism and a welding mechanism; the hanging mechanism, the fixed installation mechanism and the welding mechanism are fixedly connected by a plurality of pillars 3, the hanging mechanism is connected to the lifting mechanism of the hoisting mechanism 14, and is constructed and installed in the pressure steel pipe 12 in the deep vertical shaft through the lifting mechanism, and the fixed installation mechanism is fixedly suspended on the pressure steel pipe 12 after the pressure steel pipe 12 is installed, and is used for the stable construction of the manned cage 1 in the pressure steel pipe 12.

[0033] The welding mechanism, the fixed installation mechanism and the welding mechanism are coaxially arranged and a ladder 9 is arranged between them. The arrangement of the ladder 9 facilitates the operator to perform lifting activities on the manned cage. The operator can selectively enter each mechanism for construction according to the construction situation, thereby improving the flexibility of construction in the manned cage.

[0034] A plurality of pillars 3 are arranged in parallel, and a plurality of balancing rods 5 are arranged between the pillars 3 and along the long direction of the pillars 3, so as to increase the stability between the pillars 3 and improve the safety of the construction.

[0035] The suspension mechanism of the manned cage 1 in the present invention includes a suspension platform 2 and a plurality of suspension rings 10; the plurality of suspension rings 10 are fixedly welded to the top of the suspension platform 2, and the lifting mechanism of the hoisting mechanism 14 is hung on the suspension rings 10. The manned cage 1 is connected to the lifting mechanism through the suspension mechanism, which facilitates the lifting of the manned cage in a deep shaft.

[0036] The fixed installation mechanism includes a mounting platform 4 and a plurality of hooks 11; the fixed ends of the plurality of hooks 11 are all arranged on the mounting platform 4, and the hanging ends are all hung on the pressure steel pipe 12; the manned cage 1 is fixedly hung on the pressure steel pipe 12 through the fixed installation mechanism after the pressure steel pipe 12 is installed, thereby increasing the construction stability of the manned cage in a deep shaft.

[0037] The welding mechanism includes a manned welding construction platform 8 and a welding construction platform 6, wherein the welding construction platform 6 and the manned welding construction platform 8 are respectively fixed on the pillar 3, and the manned welding construction platform 8 is arranged below the welding construction platform 6 along the pillar 3. The manned cage installs and welds the installed pressure steel pipe through the welding mechanism, thereby improving the installation efficiency of the pressure steel pipe; wherein, the manned welding construction platform 8 is provided with guardrails 7 along the sides, thereby improving the safety protection for the operators.

[0038] The manned cage 1 of the present invention is a cylindrical structure, which is convenient for lowering the manned cage into a deep shaft.

[0039] The manufacturing method of the manned cage in the present invention is as follows:

[0040] Manufacturing the suspension mechanism, the fixing and installation mechanism and the welding mechanism of the manned cage 1;

[0041] Determine the safe load coefficient of the suspension mechanism, fixed installation mechanism and welding mechanism, determine the maximum load that the manned cage 1 needs to bear, calculate the maximum load of the manned cage 1 under the premise of the safety factor, and select the specification model that meets the load capacity according to the H-beam mechanical properties table.

[0042] Determine the hoisting operation environment of the pressure steel pipe 12, determine the diameter of the pressure steel pipe 12, and draw a structural diagram of the manned cage 1;

[0043] Install and weld H-shaped steel of corresponding specifications and models according to the structural form diagram. The welding angle shall not be less than 8mm. Polish it smooth 24 hours after welding and carry out UT flaw detection. Put it into use after passing the flaw detection.

[0044] Make pillars;

[0045] Determine the maximum load-bearing capacity of the column according to the maximum load and safety factor of the manned cage, determine the specifications and models of the column according to the mechanical properties table of round steel, and determine the height of the column according to the length of the single-section installed pressure steel pipe.

[0046] Making guardrails

[0047] Use round steel or other profiles for cutting, installation and welding.

[0048] After the manned cage 1 is assembled and welded as a whole and anti-corrosion is completed, it is put into use.

[0049] The present invention provides a method for installing a pressure steel pipe in a deep vertical shaft of a hydropower station, based on the above-mentioned installation equipment, comprising the following steps:

[0050] The lifting mechanism of the hoisting mechanism 14 pulls the manned cage 1 for use, and lifts the manned cage 1 and the first layer of pressure steel pipe 12 in parallel and lowers them into the deep shaft; after the lifting mechanism places the manned cage 1 and the first layer of pressure steel pipe 12 in the deep shaft, the lifting mechanism unloads the manned cage 1 and the first layer of pressure steel pipe 12 and lifts and assembles the second layer of pressure steel pipe 12, the second layer of pressure steel pipe 12 enters the deep shaft through the lifting mechanism and descends, the pipe mouth of the second layer of pressure steel pipe 12 passes through the manned cage 1 and is superimposed on the first layer of pressure steel pipe 12, and the operator welds the two pressure steel pipes 12 on the welding mechanism;

[0051] The lifting mechanism stacks the pressure steel pipes 12 in sequence in the deep vertical shaft. When the stacking height of the pressure steel pipes 12 is higher than the manned cage 1, the fixed installation mechanism of the manned cage 1 is suspended stably at the pipe mouth of the uppermost pressure steel pipe 12 by the operator, and the operator continues to perform welding construction; while the lifting mechanism stacks and unloads the pressure steel pipes 12, the operator connects the lifting mechanism to the hanging mechanism and then lifts and lowers. While the lifting mechanism cyclically unloads the pressure steel pipes in the deep vertical shaft, it is connected to the manned cage 1 for lifting work until the welding of the pressure steel pipes 12 in the deep vertical shaft is completed and the work is completed.

[0052] The suspension mechanism, fixed installation mechanism and welding mechanism are welded parts, the pillars are profiles, and the structural form, weight capacity and other parameters are selected according to the deadweight of the hoisting cage, welding equipment and personnel weight;

[0053] When in use, the manned cage 1 is towed by the lifting mechanism of the hoisting mechanism 14, and the suspension rings 10 of the suspension mechanism are respectively connected to the four groups of steel wire ropes of the lifting mechanism, and the manned cage 1 is in a parallel state and placed directly below the lifting mechanism to keep the manned cage 1 in the same horizontal plane when in motion.

[0054] The manned cage 1 is welded by H-shaped steel. The H-shaped steel is welded on both sides. The weld angle is not less than 8mm. The weld is a Class 1 weld and 100% UT flaw detection is qualified. In addition, in the application of pressure steel pipe installation, the manned cage's lifting and lowering operating environment is a 3.18m deep hole. The maximum diameter of the cage needs to be less than 3.18m. The bearing capacity of the annular sling needs to be calculated to meet the manned safety factor requirements.

[0055] The specifications and models of pillar 3 are selected according to the actual application. Pillar 3 is welded to the suspension mechanism, fixed installation mechanism and welding mechanism. The welding angle is not less than 8mm, the weld is a Class 1 weld, and 100% UT flaw detection is qualified.

[0056] The size of the guardrail 7 determines the height of the guardrail according to actual application, and the guardrail 7 is welded to the support, the hanging mechanism, the fixing and mounting mechanism and the welding mechanism.

[0057] When the manned cage in the present invention is in use, the auxiliary hook wire rope of the lifting mechanism is respectively connected to the corresponding suspension ring of the suspension mechanism, the manned cage 1 is adjusted to a horizontal state, and a load test is carried out. After the load test is passed, it is put into use. In the present invention, lifting ears 13 are provided on both sides of the pressure steel pipe 12, and the lifting mechanism lifts and lowers the pressure steel pipe 12 by connecting the lifting ears 13.

[0058] In the present invention, the suspension mechanism, the fixed installation mechanism and the welding mechanism are I-beams or other profile welded parts, and the specifications and models of the H-beams are selected according to the maximum load-bearing value under the premise of satisfying the safety factor. The specifications and sizes of the suspension mechanism, the fixed installation mechanism and the welding mechanism are determined according to the inner diameter of the pressure steel pipe 12 installed in the working environment of the suspension mechanism, the fixed installation mechanism and the welding mechanism, and the cutting is completed. After the cutting is completed, the assembly and welding are carried out, and the assembly and welding are completed by professional riveters and welders.

[0059] The height of the pillar 3 is determined according to the length of the installation unit section, and the specifications and models of the pillar are determined according to the required bearing capacity. The height and structural form of the guardrail 7 can be determined according to the ease of operation and safety of welders and riveters when welding.

[0060] The present invention utilizes the suspension mechanism, fixed installation mechanism and welding mechanism of a manned cage 1 to achieve high efficiency of pressure steel pipe installation and welding in the installation of pressure steel pipes in a deep shaft, and uses a simple manned platform to solve the problems of continuous installation and removal of support platforms due to great depth, waste of materials, and time consumption during the installation of pressure steel pipes. This application not only saves support platform materials, but also improves the production efficiency of pressure steel pipe installation, while avoiding safety failures caused by repeated removal of installation support platforms during construction. This construction method can well meet the construction technical requirements of pressure steel pipe installation, meet the construction quality, safety and progress requirements, and has low cost and good effect.

Claims

1. An installation device for pressure steel pipes in deep shafts of hydropower stations, characterized in that: The invention comprises a manned cage (1) connected to a lifting mechanism of a lifting mechanism (14) and suspended in a deep vertical shaft to install a pressure steel pipe (12); the manned cage (1) comprises a hanging mechanism, a fixing and installing mechanism and a welding mechanism; the hanging mechanism, the fixing and installing mechanism and the welding mechanism are fixedly connected via a plurality of pillars (3); the hanging mechanism is connected to the lifting mechanism of the lifting mechanism (14) and is installed in a pressure steel pipe (12) in the deep vertical shaft via the lifting mechanism; the fixing and installing mechanism is fixedly suspended on the pressure steel pipe (12) after the pressure steel pipe (12) is installed, and is used for stably installing the manned cage (1) in the pressure steel pipe (12); The suspension mechanism comprises a suspension platform (2) and a plurality of suspension rings (10); the plurality of suspension rings (10) are fixedly welded to the top of the suspension platform (2), and the lifting mechanism of the hoisting mechanism (14) is hung on the suspension rings (10); The fixed installation mechanism comprises a mounting platform (4) and a plurality of hooks (11); the fixed ends of the plurality of hooks (11) are all arranged on the mounting platform (4), and the hanging ends are all hung on the pressure steel pipe (12); The welding mechanism comprises a manned welding construction platform (8) and a welding construction platform (6); the welding construction platform (6) and the manned welding construction platform (8) are respectively fixed on a support column (3); and the manned welding construction platform (8) is arranged below the welding construction platform (6) along the support column (3).

2. The installation device for pressure steel pipes in deep shafts of hydropower stations according to claim 1 is characterized in that: The manned cage (1) is a cylindrical structure.

3. The installation device for pressure steel pipes in deep shafts of hydropower stations according to claim 1 is characterized in that: The welding mechanism, the fixing and installation mechanism and the welding mechanism are coaxially arranged, and a ladder (9) is arranged between them.

4. The installation device for pressure steel pipes in deep shafts of hydropower stations according to claim 1 is characterized in that: The plurality of pillars (3) are arranged in parallel, and a plurality of balancing support rods (5) are arranged between the plurality of pillars (3) and along the long direction of the pillars (3).

5. The installation device for pressure steel pipes in deep shafts of hydropower stations according to claim 1 is characterized in that: The manned welding construction platform (8) is provided with guardrails (7) along the sides.

6. A method for installing a pressure steel pipe in a deep vertical shaft of a hydropower station, characterized in that: The installation device according to any one of claims 1 to 5 comprises the following steps: The lifting mechanism of the hoisting mechanism (14) pulls the manned cage (1) for use, and lifts the manned cage (1) and the first layer of pressure steel pipe (12) in parallel and lowers them into the deep shaft; after the lifting mechanism places the manned cage (1) and the first layer of pressure steel pipe (12) in the deep shaft, the lifting mechanism unloads the manned cage (1) and the first layer of pressure steel pipe (12) and lifts and assembles the second layer of pressure steel pipe (12); the second layer of pressure steel pipe (12) enters the deep shaft through the lifting mechanism and descends; the pipe mouth of the second layer of pressure steel pipe (12) passes through the manned cage (1) and is placed on the first layer of pressure steel pipe (12); and the operator welds the two pressure steel pipes (12) on the welding mechanism; The lifting mechanism sequentially stacks pressure steel pipes (12) in a deep vertical shaft. When the stacking height of the pressure steel pipes (12) is higher than the manned cage (1), the fixed installation mechanism of the manned cage (1) is suspended by an operator at the pipe mouth of the uppermost pressure steel pipe (12) for stable suspension, and the operator continues to perform welding construction. While the lifting mechanism is stacking and unloading the pressure steel pipes (12), the operator connects the lifting mechanism to the hanging mechanism and then lifts and lowers. While the lifting mechanism cyclically unloads the pressure steel pipes in the deep vertical shaft, it is connected to the manned cage (1) for lifting work, until the welding of the pressure steel pipes (12) in the deep vertical shaft is completed, and the work is finished.

7. The method for installing a pressure steel pipe in a deep vertical shaft of a hydropower station according to claim 6, characterized in that: The manned cage (1) is formed by welding an H-shaped steel group.

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