Operation trolley for inclined shaft pressure steel pipe installation and construction method

Abstract

The invention relates to the technical field of inclined shaft construction, and discloses an operation trolley for inclined shaft pressure steel pipe installation and a construction method.The operation trolley comprises a trolley body and an operation platform which are located in a pressure steel pipe, the trolley body is composed of a walking trolley beam and an equipment platform, and one end of the equipment platform is rotationally connected with the walking trolley beam through a hinge device; an independent hydraulic pump station on the equipment platform and the adjustable supporting connecting mechanism form a closed-loop driving system, the angle of the equipment platform can be continuously adjusted, so that the equipment platform is kept horizontal at a lower bent section, a straight pipe section and an upper bent section of the inclined shaft, and the operation platform is synchronously leveled along with the equipment platform; the angle is adjusted to adapt to the radian of the bent section, a bent frame does not need to be erected, and construction efficiency is improved. The construction method comprises the steps that the first five sections of downwards-bent section steel pipes are installed in a traditional mode, then a winch is used for pulling the trolley to the installation position, welding is conducted after leveling and locking, whole-section installation is completed through repeated operation, and the problems that traditional construction is low in efficiency and high in safety risk are solved.

Description

Technical Field

[0001] This invention relates to the field of inclined shaft construction technology, specifically to a work trolley and construction method for installing pressure steel pipes in inclined shafts. Background Technology

[0002] In the installation of pressure steel pipes in the inclined shaft section of the pressure pipeline of a hydropower station's water conveyance system, a common method is as follows: When installing the pressure steel pipe in the straight section of the inclined shaft, a fixed frame construction trolley is used. The trolley is moved once after each section of steel pipe is installed. After the trolley is pulled into position, it is locked onto the lifting lugs on the inner wall of the steel pipe (lifting lugs are welded at the pipe opening of each section; these lugs are welded according to Class I weld standards before transporting the steel pipe and pass flaw detection before use; they are removed after the steel pipe installation and welding are completed). Two lifting lugs are welded inside each section of steel pipe for mounting the construction trolley, and this process must continue until one section of steel pipe is installed. The installation of the next section of steel pipe can only proceed after welding, removal of lifting lugs, grinding, and anti-corrosion treatment are completed. This process presents significant construction difficulties, safety risks, and low efficiency. During the construction of the upper and lower bends, the curvature of the pipe sections prevents the use of the straight pipe section construction trolley in the inclined shaft. A construction scaffold must be erected, with a simple platform laid for each pressure steel pipe section installed. The scaffold must be erected section by section as the pipe rises, and then dismantled layer by layer after the bend is installed. This process is both time-consuming and labor-intensive, extending the construction period of the inclined shaft pressure steel pipe installation. Furthermore, the erection and dismantling of the construction scaffold pose certain safety risks. Especially in the upper bend, due to its location, it is impossible to erect the scaffold from the lower bend all the way to the top. Therefore, steel brackets must be welded to the inner wall of the starting pipe section of the upper bend before the scaffold is erected layer by layer. When the brackets are removed, the cut areas on the inner wall of the steel pipe also need to be ground and repainted. Summary of the Invention

[0003] The purpose of this invention is to provide a work trolley for installing pressure steel pipes in inclined shafts. The work trolley includes a traveling beam and an equipment platform. One end of the equipment platform is connected to the traveling beam via a hinge device, and the other end is connected to the traveling beam via an adjustable support connection mechanism. The angle can be adjusted by the extension and retraction of the adjustable support connection mechanism to adapt to the curvature of the bend, eliminating the need for scaffolding and avoiding the safety risks and construction time waste associated with scaffolding erection and dismantling. The invention also provides a construction method in which the first five sections of the lower bend section of steel pipe are installed in a traditional manner. Then, a winch is used to pull the trolley to the installation position. After leveling and locking, welding is performed. This process is repeated to complete the installation of all pressure steel pipes from the lower bend section, straight pipe section to the upper bend section of the inclined shaft, thus solving the problems of low efficiency and high safety risks in traditional construction.

[0004] This invention is achieved through the following technical solution: A work trolley for installing pressure steel pipes in inclined shafts includes a trolley body and an operating platform located in the pressure steel pipe. The trolley body includes a traveling beam and an equipment platform. One end of the equipment platform is rotatably connected to one end of the traveling beam via a hinge device, and the other end of the equipment platform is movably connected to the other end of the traveling beam via an adjustable support connection mechanism. The equipment platform is equipped with an independent hydraulic pump station, which forms a closed-loop drive system with the adjustable support connection mechanism. The angle of the equipment platform relative to the traveling beam is continuously adjusted by the telescopic drive of the closed-loop drive system, and the equipment platform can maintain a horizontal working state during construction of the inclined shaft lower bend section, straight pipe section and upper bend section. The operating platform is fixed to the edge of the equipment platform and is leveled synchronously with it.

[0005] In this solution, the hinge device and adjustable support connection mechanism work together to form a closed-loop drive system with an independent hydraulic pump station, enabling continuous adjustment of the angle of the equipment platform relative to the traveling beam. This ensures that the platform can maintain a horizontal working state during construction in the lower bend, straight pipe, and upper bend sections of the inclined shaft. At the same time, the operating platform is leveled synchronously with the equipment platform, allowing for the installation of pressure steel pipes throughout the inclined shaft without frequent equipment changes, the need to erect construction scaffolds, or the frequent welding of lifting lugs on the inner wall of the steel pipe. This solves the problems of low efficiency and high safety risks in traditional construction.

[0006] As a further embodiment of the work trolley, the adjustable support connection mechanism includes a first fixed hinge support, a hydraulic cylinder, and a second fixed hinge support. One end of the hydraulic cylinder is hinged to the equipment platform through the first fixed hinge support, and the other end of the hydraulic cylinder is hinged to the traveling beam through the second fixed hinge support. This provides a stable structural foundation and a flexible driving carrier for adjusting the angle of the equipment platform relative to the traveling beam. Combined with the closed-loop drive system formed by the independent hydraulic pump station, it can accurately achieve continuous angle adjustment of the equipment platform during construction in the lower curved section, straight pipe section, and upper curved section of the inclined shaft, while maintaining a horizontal working state.

[0007] As a further embodiment of the work trolley, the traveling beams are arranged in pairs, and each traveling beam has multiple traveling wheels at its bottom. The radial direction of the traveling wheels and the radial direction of the inner wall of the pressure steel pipe are in a straight line, which ensures the stability and fit of the trolley when it travels inside the pressure steel pipe, so that the wheels are always in contact with the inner wall of the steel pipe perpendicularly, and can adapt to the direction of the steel pipe in different sections of the inclined shaft.

[0008] As a further option for the work trolley, the operating platform is divided into multiple stepped sections along the angle of the inclined shaft, which facilitates welding operations at different locations during the installation of pressure steel pipes. At the same time, the multi-step stepped structure can meet the needs of multiple construction workers to work together, thus improving construction efficiency.

[0009] As a further solution for the work trolley, two traction lugs are welded to the front sides of the equipment platform. A slow-speed winch is used to drag the work trolley through the traction lugs, allowing it to move along the inner wall of the pressure steel pipe. This ensures that the trolley can accurately reach the work position as the installation progresses. With the guidance of the traveling wheels, the relocation process is stable and controllable, avoiding the inefficiency caused by the inconvenience of equipment movement in traditional construction. At the same time, the use of the slow-speed winch ensures the safety of the relocation process.

[0010] As a further solution for the work trolley, the front end of the equipment platform is also equipped with two fixed lifting lugs. The fixed lifting lugs are connected to the pressure steel pipe opening through steel chain links and shackles, and are combined with multiple hand-operated hoists to cross-lock and form a double anti-fall mechanism, ensuring that the trolley will not slip or fall during equipment platform angle adjustment and construction personnel operation. It is especially suitable for the safety requirements of inclined shaft environment, avoiding the safety risks caused by insecure fixing in traditional construction. At the same time, there is no need to weld temporary lifting lugs on the inner wall of the steel pipe, reducing damage to the steel pipe body and subsequent processing procedures.

[0011] A construction method for installing pressure steel pipes in inclined shafts includes a work trolley for installing pressure steel pipes in inclined shafts, and the steps are as follows: Step 1: Install sections 1-5 of the downward-bending steel pipe using traditional methods to establish the initial working benchmark; Step 2: Before installing the sixth lower bend pipe, transfer the work trolley from the lower horizontal tunnel to the already installed steel pipe, and pull it to the installation position of the sixth lower bend pipe using a winch; Step 3: After the trolley is pulled into position, adjust the angle between the equipment platform and the traveling beam, observe whether the equipment platform is level, and make appropriate adjustments. Step 4: After the trolley is leveled, the fixed lifting lugs and pressure steel pipe openings are locked together using steel chain links and shackles. At the same time, two hand chain hoists are set up and locked together with the steel chain links. Construction personnel enter the operating platform through the built-in ladder. Step 5: After locking and leveling the construction trolley, the construction personnel can weld the weld between the two steel pipes on the operating platform without the need to set up temporary scaffolding. Step 6: After the installation of a single steel pipe section is completed, the winch pulls the trolley to move to the opening of the next steel pipe section to be installed, and repeats steps 3-5 until the installation of the entire section is completed.

[0012] In this solution, the traditional process is combined with the work trolley (the installation of sections 1-5 of the downward bend is completed first, and then the trolley is introduced). The orderly connection of the trolley's traction and displacement, angle leveling, locking and fixing and welding operations is achieved. In particular, the continuity of the installation of the entire section (downward bend, straight pipe section and upward bend) is achieved by repeating the steps. This not only retains the applicability of the traditional process in the initial stage, but also gives full play to the advantages of the work trolley, which can be adjusted in angle and does not require the erection of temporary scaffolding. It avoids the inefficiency and safety risks caused by equipment switching, scaffolding erection and dismantling, and welding and dismantling of lifting lugs in traditional construction.

[0013] Furthermore, in steps 2 and 6, before the winch lowers the inclined shaft section of steel pipe, two steel wire ropes are prepared. The upper ends of the steel wire ropes are hung on the winch hook, and the lower ends extend into the steel pipe. When the pressure steel pipe to be installed is lowered to 300mm from the opening of the already installed steel pipe, the lower ends of the two steel wire ropes are respectively hung on the traction lugs of the work platform. After the winch lifting button is activated to apply force to the steel wire ropes, the operator removes the locking hook of the already installed steel pipe opening from the equipment platform, and the winch lowers the hook to connect the steel pipe to be installed with the already installed steel pipe. Pipe section connection; remove the wire rope from the steel pipe to be installed, and the winch continues to lift the work trolley until the equipment platform is 1m away from the pipe opening. Then, hook the steel chain link onto the pipe opening. The winch slowly lowers the trolley to the installation position and locks it with two hand-operated hoists in a crisscross pattern. Remove the traction wire rope to ensure precise control when lowering the steel pipe to the connection position. This avoids delays or safety hazards caused by poor coordination between the equipment and the steel pipe during traditional relocation processes.

[0014] Furthermore, in step 3, the equipment platform needs to be adjusted 2 to 3 times in the upper and lower curved sections of the inclined shaft steel pipe, and only 1 time in the straight section of the inclined shaft. This ensures the adaptability and operational stability of the trolley in different inclined shaft sections, and avoids unnecessary adjustment operations to improve construction efficiency.

[0015] Furthermore, in step 3, when adjusting the level of the equipment platform, the construction workers stand on the pedestrian safety passage near the pipe opening on the outer wall of the installed steel pipe, and start the hydraulic pump station wirelessly by remote control to operate the power distribution and control cabinet. They use the extension and retraction of the hydraulic cylinder to adjust the angle between the equipment platform and the traveling beam, thus avoiding the risk of the equipment platform falling when it is in an inclined state.

[0016] Compared with the prior art, the present invention has the following advantages and beneficial effects: This invention utilizes an angle-adjustable work trolley, eliminating the need for welding and dismantling lifting lugs on the inner wall of the steel pipe, as well as the erection of construction scaffolding. This eliminates numerous auxiliary procedures, and the trolley can cover the entire inclined shaft, including the lower bend, straight section, and upper bend, without requiring equipment replacement. This significantly improves construction continuity and overall efficiency, and shortens the construction period. The invention uses hydraulic cylinders to adjust the platform angle, ensuring it remains level. Combined with a double anti-fall mechanism formed by steel chain links, shackles, and hand-operated hoists, this guarantees the safety of construction personnel. Trolley movement is achieved through a winch and traction lugs, ensuring a stable and controllable process and reducing the possibility of accidents. Furthermore, the continuous angle adjustment of the hydraulic cylinders allows for flexible adaptation to changes in the curvature and slope of different sections of the inclined shaft, enabling integrated construction across the entire section and providing greater adaptability. Attached Figure Description The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and form part of this application, do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the longitudinal section structure of the construction trolley of the present invention; Figure 2 This is a schematic diagram of the elevation structure of the construction trolley of the present invention; Figure 3 This is a top view of the construction trolley equipment platform structure of the present invention; Figure 4 This is a schematic diagram of the locking mechanism of the construction trolley during actual construction of the present invention; Figure 5 This is a schematic diagram of the longitudinal section layout of the construction trolley during operation of the present invention.

[0017] The attached diagram shows the markings and corresponding component names: 1-Hinge device, 2-Hydraulic pump station, 3-Equipment platform, 101-Trolley body, 102-Operating platform, 4-First fixed hinge support, 5-Hydraulic cylinder, 6-Second fixed hinge support, 7-Traveling beam, 8-Traveling wheel, 9-Traction lug, 10-Fixed lug, 11-Steel chain link, 12-Hook, 13-Hand chain hoist, 14-Power distribution control cabinet. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0019] Example 1 This embodiment 1 provides a work trolley for installing pressure steel pipes in inclined shafts, such as... Figure 1 As shown, it includes a trolley body 101 and an operating platform 102 located in a pressure steel pipe; like Figures 1-4 As shown, the trolley body 101 includes two parallel traveling beams 7 and an equipment platform 3; Among them, such as Figures 1-4 As shown, the traveling beam 7 is welded and fixed by transverse connecting channel steel to form a stable frame structure. Two traveling wheels 8 are installed at each end of the bottom of the traveling beam 7, for a total of four. The two front traveling wheels 8 are 12×2.5-inch heavy-duty iron-core nylon universal wheels (60mm wide, 300mm in diameter), which can turn 360°. The two rear traveling wheels 8 are fixed wheels of the same specification, with a rated load of 3t per wheel. The radial direction of all traveling wheels 8 is consistent with the radial direction of the inner wall of the pressure steel pipe, ensuring that when the trolley travels along the axis of the steel pipe, the wheels are always in contact with the inner wall of the steel pipe perpendicularly, avoiding slippage or deviation, and providing stable walking support for the trolley.

[0020] At the same time, such as Figures 1-4 As shown, the bottom of the above-mentioned equipment platform 3 is reinforced by crisscrossing I-beams, with a rated load capacity of 8t. One end of the equipment platform 3 is hinged to the front end of the traveling beam 7 via a hinge device 1, forming a rotation fulcrum. The other end of the equipment platform 3 is connected to the rear end of the traveling beam 7 via an adjustable support connection mechanism to achieve angle adjustment.

[0021] Specifically, such as Figures 1-2 As shown, the adjustable support connection mechanism includes a first fixed hinge support 4, a hydraulic cylinder 5, and a second fixed hinge support 6. The first fixed hinge support 4 is welded to the bottom of the equipment platform 3 at the end away from the hinge device 1. The second fixed hinge support 6 is welded to the top of the rear end of the traveling beam 7. The two ends of the hydraulic cylinder 5 are respectively hinged to the two fixed hinge supports through pins to form a telescopic support structure. Furthermore, the equipment platform 3 is equipped with an independent hydraulic pump station 2 and a power distribution control cabinet 14. The power distribution control cabinet 14 is installed at the rear end of the equipment platform 3, and the hydraulic pump station 2 is fixed in the middle of the equipment platform 3. Hydraulic pump station 2 is connected to hydraulic cylinder 5 via high-pressure oil pipe to form a closed-loop drive system. Hydraulic pump station 2 can control the extension and retraction of hydraulic cylinder 5 through solenoid valve to change the angle between equipment platform 3 and traveling beam 7, so that equipment platform 3 can maintain a horizontal state in different slope sections of the inclined shaft, ensuring construction stability. In actual application, the power distribution control cabinet 14 also has built-in circuit breaker, contactor and wireless receiving module to realize remote adjustment of the angle of equipment platform 3. Construction personnel can operate the remote control from the safety passage on the outer wall of the steel pipe to avoid danger when entering the inclined platform.

[0022] like Figure 1As shown, the operating platform 102 has a trapezoidal step structure, fixed to the edge of the equipment platform 3, and is leveled synchronously with the equipment platform 3. Specifically, it consists of three layers: upper, middle, and lower. The upper platform is 1350mm above the equipment platform surface (to meet the maximum operating height requirements of construction personnel), and the upper platform is fully covered with 300mm×3000mm anti-slip metal planks. The middle and lower platforms are only covered with two planks of the same specification on each side near the inner wall of the steel pipe. The planks are connected by M16 bolts with an overlap length of ≥100mm. The open surfaces of the upper and middle platforms are equipped with safety railings with a height of 1200mm, and the bottom of the railings is equipped with 200mm high steel kick plates to prevent tools or debris from falling.

[0023] To ensure that the trolley does not slip or fall in the inclined environment of the shaft, this embodiment also includes a displacement and fixing system, specifically, such as... Figure 1 and Figure 4 As shown, two traction lugs 9 are symmetrically welded on both sides of the front end of the equipment platform 3. They are connected to a slow-speed winch via wire ropes and used for moving the trolley inside the steel pipe. During the traction process, the angle of the equipment platform 3 can be pre-adjusted by the hydraulic cylinder 5 to make the trolley adapt to the direction of the steel pipe. At the same time, two fixed lugs 10 are welded to the middle of the front end of the equipment platform 3. After the trolley is moved to the working position, it is connected and fixed to the pressure steel pipe opening via steel chain links 11 and 10t shackles. Two 5t hand chain hoists 13 are also set up. One end is hooked to the fixed lugs 10, and the other end is cross-hooked to the steel chain links 11 to form double anti-fall protection to ensure that the trolley does not slip or fall in the inclined environment of the inclined shaft.

[0024] In summary, the work trolley in this embodiment can achieve efficient installation of the entire pressure steel pipe in the inclined shaft through the above-mentioned structure, without the need to erect a construction scaffold or weld temporary lifting lugs, effectively solving the problems of cumbersome procedures, high safety risks, and easy damage to the steel pipe body in traditional construction.

[0025] Example 2 To avoid the inefficiencies and safety risks associated with equipment switching, scaffolding erection and dismantling, and welding and dismantling of lifting lugs in traditional construction, this embodiment 2 provides a construction method for installing pressure steel pipes in inclined shafts, based on a work trolley used in embodiment 1. The steps are as follows: Step 1: Assemble the steel pipe sections of the inclined shaft bend section 1-5 using traditional methods; Step 2: Before installing the sixth section of the lower bend pipe, transport the trolley from the lower flat tunnel to the steel pipe inside the lower bend section of the steel pipe. As the steel pipe installation progresses, use a winch to pull the construction trolley to the steel pipe installation position. Step 3: After the trolley is pulled into place, adjust the angle between the equipment platform 3 and the traveling beam 7, observe whether the equipment platform is level, and make appropriate adjustments. Specifically, when adjusting the level of the equipment platform 3, the construction personnel stand on the pedestrian safety passage near the pipe opening of the installed steel pipe and start the hydraulic pump station 2 by wirelessly operating the power distribution and control cabinet 14 through the remote control. The extension and retraction of the hydraulic cylinder 5 is used to adjust the angle between the equipment platform 3 and the traveling beam 7, so as to achieve the purpose of leveling the equipment platform 3. During the adjustment, the equipment platform 3 needs to be adjusted 2 to 3 times in the upper and lower curved sections of the inclined shaft steel pipe, and only one angle adjustment is needed in the straight section of the inclined shaft. Step 4: After the trolley equipment platform 3 is leveled, the construction personnel enter the equipment platform 3 through the ladder and lock the trolley at the pipe opening using steel chain links 11, shackles and hooks 12. In addition, two hand chain hoists 13 are set up to be locked together with the steel chain links 11 as a fall protection for the trolley to prevent it from falling. A ladder is set up inside the trolley as a passage to go up and down the platform. It is strictly forbidden to start other work without locking the trolley. Step 5: After locking and leveling the construction trolley, the construction personnel can weld the weld between the two steel pipes on the operating platform 102. Step 6: After completing the installation work between the two steel pipe sections, use a winch to continue lowering the steel pipe section, lift it up, and lock the construction trolley at the top of the steel pipe opening. Repeat the above construction steps. Step 7: Complete the installation of all pressure steel pipe segments from the lower bend section and straight pipe section to the upper bend section of the inclined shaft.

[0026] In steps 2) and 4), before the winch lowers the inclined section of the steel pipe, two additional steel wire ropes are prepared. The upper ends of the steel wire ropes are hung on the winch hook, and the lower ends extend into the steel pipe. When the steel pipe section is lowered to a distance of approximately 300mm from the end of the installed steel pipe, the lower ends of the two steel wire ropes pre-hung on the winch hook are respectively hung on two additional traction lugs 9 on the construction trolley. The winch lifting button is activated, and after the two steel wire ropes are under tension, the operator stands on the equipment platform 3 and removes the locking hook 12 hanging on the end of the installed steel pipe. The winch lowers the hook, placing the steel pipe to be installed onto the installed pipe section. After removing the wire rope from the winch attached to the steel pipe to be installed, the winch continues to lift the construction trolley. When the equipment platform 3 is about 1m away from the pipe opening of the steel pipe to be installed, the hook 12 of the steel chain link 11 on the construction trolley is attached to the pipe opening of the steel pipe to be installed. After the winch lifts the construction trolley and slowly lowers it to the installation position, two hand-operated hoists 13 are used to lock it together with the steel pipe chain link 11. Then, the two wire ropes that pull the construction trolley on the winch are removed.

[0027] Example 3 This embodiment, based on the aforementioned work trolley, details the installation and construction steps for a working condition with a 45° inclined shaft angle, a 6.8m inner diameter pressure steel pipe, and a 3m length per section, as follows: Step 1: Install 1-5 sections of the downward bend steel pipe using traditional hoisting technology. The steel pipe is hoisted to the entrance of the lower horizontal tunnel using a ground gantry crane. Two 25t winches pull the steel pipe down the inclined shaft track. When the front end of the steel pipe is 300mm away from the installed pipe section, the docking axis is finely adjusted using a hand-operated hoist 13 to ensure that the misalignment is ≤1mm and the gap is 2-3mm. The pipe is then temporarily fixed with rigid supports. The circumferential seams of sections 1-5 of the steel pipe are welded using manual electric arc welding. After layered welding, ultrasonic testing is performed to ensure that the weld quality meets the Class I weld standard, thus forming the initial working reference section.

[0028] Step 2: Transport the work trolley through the lower tunnel to the opening of the 5th steel pipe. Connect the wire rope of the slow winch to the trolley traction lug 9 through the guide wheel. Start the winch and slowly pull the trolley into the installed steel pipe. Pull the trolley to the installation position of the 6th lower bend pipe (1.5m away from the pipe opening to be installed), and stop pulling.

[0029] Step 3: The construction workers stand on the pedestrian safety passage on the outer wall of the 5th steel pipe section and start the power distribution control cabinet 14 with the remote control to put the hydraulic pump station 2 into working condition; operate the remote control to control the extension and retraction of the hydraulic cylinder 5 to adjust the angle between the equipment platform 3 and the traveling beam 7; since the sixth section is a downward-bending steel pipe section, it needs to be adjusted twice according to the curvature of the pipe section: the first adjustment is to make the front end of the platform slightly higher than the horizontal state, and after the steel pipe is connected, it is finely adjusted again to be completely horizontal. The extension and retraction of the hydraulic cylinder at this time is recorded as the reference value for the adjustment of the same type of bending section.

[0030] Step 4: After leveling the trolley, connect the fixed lifting lug 10 at the front end of the equipment platform 3 to the pre-set lifting point at the pipe opening of the sixth section of steel pipe to be installed through two steel chain links 11. The two ends of the chain links are locked with 10t shackles to ensure that the connection is not loose. Two 5t hand-operated hoists 13 are cross-set between the steel chain links 11 and the equipment platform 3. Slowly tighten the hoists to make the chain bear the force, forming a double anti-fall protection. At this time, check the overall stability of the trolley to ensure that there is no shaking. The construction personnel enter the operating platform through the built-in ladder of the trolley, check the firmness of the metal plank of the upper platform and the connection quality of the safety guardrail. After confirming that everything is correct, prepare for welding operation.

[0031] Step 5: The sixth steel pipe is lowered along the track by a ground winch. When the front end of the steel pipe is 300mm away from the opening of the fifth steel pipe, the lowering is stopped. The lower ends of the two traction wire ropes are hung on the traction lugs 9 of the trolley, and the upper ends are connected to the winch hook. The winch lifting button is activated to load the wire ropes. The construction personnel remove the temporary support at the opening of the fifth steel pipe on the operating platform and slowly lower the hook to make the sixth steel pipe accurately connect with the fifth steel pipe. The axis deviation is checked by the scale on the edge of the trolley operating platform to ensure that it meets the specifications. After the connection is completed, a rigid clamp is used for temporary fixation. The construction personnel perform circumferential welding on the upper, middle and lower layers of the operating platform. Except for the upper platform which is fully covered with metal planks, the other platforms are only covered with metal planks at both ends near the inner wall of the steel pipe. The specifications of the metal planks are 300mm (width) × 3000mm (length). Safety railings are set on all open surfaces of the upper and middle platforms, and kick guards are installed at the bottom of the railings with a height of 200mm.

[0032] Step 6: After the sixth section of steel pipe is welded and passes the flaw detection, loosen the shackles of the hand chain hoist 13 and the steel chain link 11, start the winch to lift the trolley, and stop lifting when the equipment platform is 1m away from the opening of the sixth section of steel pipe; re-hook the steel chain link 11 onto the opening of the sixth section of steel pipe, lower the trolley to the installation position, lock the shackles, and once again use the hand chain hoist 13 to form a fall protection, and remove the traction wire rope.

[0033] Repeat steps 3-5 to install the subsequent steel pipes. For each section of the lower bend, the angle of the equipment platform needs to be adjusted 2-3 times. For each section of the straight pipe, it needs to be adjusted once. The adjustment method for the upper bend is the same as that for the lower bend. When the pipe is installed to the top of the inclined shaft, it is connected to the pre-embedded parts at the wellhead through the fixed lifting lug 10 at the front end of the trolley to ensure the stability of the trolley when welding the last section of the steel pipe.

[0034] Step 7: After the entire steel pipe section is installed, conduct a final visual inspection and water pressure test on all circumferential joints.

[0035] This embodiment achieves efficient installation of the entire steel pipe section of the inclined shaft through angle adjustment, safety locking, and cyclic operation process of the work trolley. Compared with the traditional process, it reduces the construction period and avoids damage caused by welding of the lifting lugs on the inner wall of the steel pipe.

[0036] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A work trolley for installing pressure steel pipes in inclined shafts, characterized in that, The device includes a trolley body (101) and an operating platform (102) located in a pressure steel pipe. The trolley body (101) includes a traveling beam (7) and an equipment platform (3). One end of the equipment platform (3) is rotatably connected to one end of the traveling beam (7) through a hinge device (1). The other end of the equipment platform (3) is movably connected to the other end of the traveling beam (7) through an adjustable support connection mechanism. The equipment platform (3) is equipped with an independent hydraulic pump station (2). The hydraulic pump station (2) and the adjustable support connection mechanism form a closed-loop drive system. The angle of the equipment platform (3) relative to the traveling beam (7) is continuously adjusted by the telescopic drive of the closed-loop drive system. The equipment platform (3) can maintain a horizontal working state during the construction of the inclined shaft lower bend section, straight pipe section and upper bend section. The operating platform (102) is fixed to the edge of the equipment platform (3) and is leveled synchronously with it.

2. The work trolley for installing pressure steel pipes in inclined shafts according to claim 1, characterized in that, The adjustable support connection mechanism includes a first fixed hinge support (4), a hydraulic cylinder (5) and a second fixed hinge support (6). One end of the hydraulic cylinder (5) is hinged to the equipment platform (3) through the first fixed hinge support (4), and the other end of the hydraulic cylinder (5) is hinged to the traveling beam (7) through the second fixed hinge support (6).

3. The work trolley for installing pressure steel pipes in inclined shafts according to claim 1, characterized in that, The traveling beams (7) are arranged in pairs, and each traveling beam (7) has multiple traveling wheels (8) at its bottom. The radial direction of the traveling wheels (8) and the radial direction of the inner wall of the pressure steel pipe are on a straight line.

4. The work trolley for installing pressure steel pipes in inclined shafts according to claim 1, characterized in that, The operating platform (102) is divided into multiple stepped sections along the angle of the inclined shaft.

5. A work trolley for installing pressure steel pipes in inclined shafts according to claim 1, characterized in that, Two traction lugs (9) are welded to the front sides of the equipment platform (3). The slow winch is dragged by the traction lugs (9) to move the construction trolley on the inner wall of the pressure steel pipe.

6. A work trolley for installing pressure steel pipes in inclined shafts according to claim 5, characterized in that, The front end of the equipment platform (3) is also provided with two fixed lifting lugs (10). The fixed lifting lugs (10) are connected to the pressure steel pipe opening through steel chain links (11) and shackles, and are locked together with multiple hand chain hoists (13) to form a double anti-fall mechanism.

7. A construction method for installing pressure steel pipes in inclined shafts, characterized in that, The method includes a work trolley for installing pressure steel pipes in inclined shafts as described in any one of claims 1-6, with the following steps: Step 1: Install sections 1-5 of the downward-bending steel pipe using traditional methods to establish the initial working benchmark; Step 2: Before installing the sixth lower bend pipe, transfer the work trolley from the lower horizontal tunnel to the already installed steel pipe, and pull it to the installation position of the sixth lower bend pipe using a winch; Step 3: After the trolley is pulled into place, adjust the angle between the equipment platform (3) and the traveling beam (7), observe whether the equipment platform (3) is level, and make appropriate adjustments; Step 4: After the trolley is leveled, the fixed lifting lug (10) and the pressure steel pipe opening are locked by the steel chain link (11) and shackle. At the same time, two hand chain hoists (13) are set up to be locked together with the steel chain link (11). Construction personnel enter the operating platform (102) through the built-in ladder. Step 5: After locking and leveling the construction trolley, the construction personnel can weld the weld between the two steel pipes on the operating platform (102) without the need to set up a temporary scaffold. Step 6: After the installation of a single steel pipe section is completed, the winch pulls the trolley to move to the opening of the next steel pipe section to be installed, and repeats steps 3-5 until the installation of the entire section is completed.

8. A construction method for installing pressure steel pipes in inclined shafts according to claim 7, characterized in that, In steps 2 and 6, before the winch lowers the inclined shaft section of the steel pipe, prepare two wire ropes. The upper ends of the wire ropes are hung on the winch hook, and the lower ends extend into the steel pipe. When the pressure steel pipe to be installed is lowered to 300mm from the pipe opening of the installed steel pipe, the lower ends of the two wire ropes are respectively hung on the traction lugs (9) of the work platform. After the winch lifting button is activated to make the wire ropes bear force, the operator removes the locking hook of the pipe opening of the installed steel pipe on the equipment platform (3). Hook (12), the winch lowers the hook to connect the steel pipe to be installed with the installed pipe section; remove the wire rope on the steel pipe to be installed, the winch continues to lift the work trolley, when the equipment platform (3) is 1m away from the pipe opening of the steel pipe to be installed, hang the hook (12) of the steel chain link (11) on the pipe opening of the steel pipe to be installed, the winch slowly lowers the trolley to the installation position, and then uses two hand chain hoists (13) to lock the steel chain link (11) in a cross shape, and remove the traction wire rope.

9. A construction method for installing pressure steel pipes in inclined shafts according to claim 7, characterized in that, In step 3, the equipment platform (3) needs to be adjusted 2 to 3 times in the upper and lower curved sections of the inclined shaft steel pipe, and only 1 time in the straight section of the inclined shaft.

10. A construction method for installing pressure steel pipes in inclined shafts according to claim 7, characterized in that, In step 3, when adjusting the level of the equipment platform (3), the construction personnel stand on the pedestrian safety passage near the pipe opening of the installed steel pipe and start the hydraulic pump station (2) by wirelessly operating the power distribution and control cabinet (14) via remote control. They then use the extension and retraction of the hydraulic cylinder (5) to adjust the angle between the equipment platform (3) and the traveling beam (7).

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