Movable large-diameter ductile cast iron pipe installation device

Abstract

This utility model discloses a mobile installation device for large-diameter ductile iron pipes, belonging to the field of pipeline construction technology in water conservancy engineering. Addressing the problem of limited installation efficiency due to the complex structure and cumbersome operation steps of existing external installation devices for large-diameter ductile iron pipes, this invention proposes an integrated hydraulic drive installation scheme. The device includes hydraulic traction trolleys symmetrically arranged on the outside of pipe sections. The top of the trolley supports part of the weight of the pipe section via an arc-shaped support plate. A hydraulic drive component is fixed to the trolley; its power input end is fixedly connected to the outer wall of the installed pipe section via a ring-shaped sling, and its power output end is hooked to the end of the pipe section to be installed via a hook. The hydraulic retraction action pulls the pipe section to be installed, causing the spigot to insert into the socket of the installed pipe section. Safe operation is achieved via a remote control. This utility model simplifies the device structure, reduces assembly steps, significantly improves installation efficiency, and enhances operational safety, making it suitable for trench installation of large-diameter ductile iron pipes.

Description

Technical Field

[0001] This utility model belongs to the field of pipeline construction technology in water conservancy or municipal engineering, and specifically relates to a docking and installation device for large-diameter ductile iron pipelines. Background Technology

[0002] Large-diameter ductile iron pipes are widely used in municipal water supply, drainage, and water conservancy projects. They are typically laid in excavated trenches with a compacted sand cushion layer at the bottom, and then buried after installation, ensuring the pipes are not exposed. Currently, there are two main technical solutions for pipe installation: One method is the traditional method of installing electric hoists inside pipe sections. This involves setting up internal supports inside the pipe and using an electric hoist to pull the new and old pipe sections together. Specifically, an internal support is installed inside the last section of the already installed pipe. One end of the electric hoist is connected to the internal support, and the other end is hooked onto the rear end of the new pipe section (i.e., the pipe section to be installed). The new pipe section's spigot is inserted into the socket of the old pipe section (i.e., the already installed pipe section) by pulling together, thus achieving the connection.

[0003] Secondly, the retrieved comparative patent (application number 202321008032.7, a large-diameter ductile iron pipe docking and installation device) uses a limiting pipe clamp (fitted onto the outer wall of the installed pipe section), a jacking mechanism (isosceles triangular jacking frame), and an electric hoist pulling mechanism (first and second steel cable rings connect the limiting pipe clamp and the jacking mechanism), and achieves docking by driving the jacking frame with a horizontal directional drill.

[0004] I. Shortcomings of existing technologies.

[0005] (a) Installation method of electric hoist inside traditional pipe section.

[0006] The construction space is limited. Although the pipe section has a large diameter, the interior must accommodate operators, electric hoists, internal supports, and other equipment, thus restricting the range of operations. The lighting conditions are poor, with dim lighting inside the pipe section, affecting the operators' ability to observe critical steps such as aligning the socket and connecting the hooks. The installation efficiency is low. Due to space and lighting limitations, the operation process is cumbersome (such as installing internal supports and adjusting hoist hooks), and a team of 10 people can only install 3-4 pipe sections per day. The safety risks are high, as personnel need to operate the hand-operated hoist at close range inside the pipe section, posing a risk of injury from disengagement.

[0007] (ii) Comparison of patented technical solutions.

[0008] Although moving the device outside the pipe section solved the space and lighting problems, there are still drawbacks: the structure is complex, requiring the assembly of multiple components such as limiting pipe clamps (bolted half clamps), jacking frames (isosceles triangle structure and rubber arc blocks), and steel cable loops, and the installation steps are cumbersome (such as the steel cable loops bypassing the limiting grooves, the connection between the horizontal directional drill and the jacking pipe, etc.); the power source relies on the horizontal directional drill and electric hoist working together, the equipment coordination control is difficult, and the docking accuracy is easily affected by synchronization errors; the improvement in installation efficiency is limited (the data is not clear, but the assembly and coordination control of multiple components may limit further improvement in efficiency).

[0009] II. Reasons for the inadequacy of existing technologies.

[0010] Traditional technologies focus on "operation within the pipe section," while the patented technology focuses on "rigid connection of multiple external components + electric hoist pulling." Neither of these technologies overcomes the technical limitation of "reliance on complex structures": traditional technologies suffer from operational inefficiency due to internal space compression, while the patented technology results in cumbersome processes due to the assembly of multiple components and the coordination of multiple power sources. In contrast, this patent application establishes a new technical route that simplifies the structure through "integrated drive of a hydraulic rod trolley," achieving efficient docking with a single power source (hydraulic rod).

[0011] III. The necessity of improvement.

[0012] With the increasing demand for large-diameter ductile iron pipes in urban infrastructure construction and the rising requirements for installation efficiency in engineering projects, the low efficiency of traditional technologies and the complex structures of comparative patents can no longer meet the needs. Simplifying the structure of external installation devices for large-diameter ductile iron pipe sections and improving operational convenience and efficiency have become core issues that urgently need to be addressed in this field. Therefore, it is clearly necessary to improve the drive structure and connection method of existing external installation devices, which is precisely the content to be addressed in this patent application. Utility Model Content

[0013] The purpose of this utility model is to provide a technical solution that simplifies the structure of the external drive device for pipelines to improve installation efficiency, thereby overcoming the shortcomings of the prior art, which is characterized by cumbersome operation steps and limited installation efficiency due to the use of rigid connections of multiple components and electric hoist pulling.

[0014] To achieve the above objectives, the mobile large-diameter ductile iron pipe installation device of this utility model includes two hydraulic traction trolleys, a hydraulic drive assembly, an old pipe section connection assembly, and a new pipe section connection assembly. The hydraulic traction trolley is symmetrically arranged on the left and right sides of the pipe section to be installed along the pipeline axis and is in active contact with the sand cushion layer at the bottom of the installation trench. The hydraulic drive components are fixedly installed on the hydraulic traction trolley one by one. The power output end is movably connected to the end of the pipe section to be installed through the new pipe section connection component, and the power input end is fixedly connected to the outer wall of the installed pipe section through the old pipe section connection component. The hydraulic drive component pulls the pipe section to be installed along the axial direction by contraction action, so that the spigot of the pipe section to be installed is inserted into the socket of the installed pipe section.

[0015] The old pipe section connection assembly includes an annular sling and a locking component; the annular sling is sleeved on the outer wall of the installed pipe section, and its two ends are detachably and fixedly connected by the locking component to form a closed loop structure; the middle part of the annular sling is hinged to the power input end of the hydraulic drive assembly.

[0016] The new pipe section connecting assembly includes a pull hook and an adjusting chain; the hook head of the pull hook is movably connected to the end wall of the pipe section to be installed, and the tail is detachably connected to the power output end of the hydraulic drive assembly through the adjusting chain; the length of the chain links of the adjusting chain is adjustable to adapt to pipe sections of different lengths.

[0017] The hydraulic traction trolley also includes a load-bearing support assembly; the load-bearing support assembly includes an arc-shaped support plate and an elastic buffer on the top of the hydraulic traction trolley; the arc-shaped support plate is movably connected to the frame of the hydraulic traction trolley through the elastic buffer, and its arc surface fits against the outer wall of the pipe section to be installed, bearing part of the weight of the pipe section.

[0018] It also includes a remote control unit; the remote control unit is electrically connected to the hydraulic drive assembly and is used to control the extension and retraction and start / stop of the hydraulic drive assembly.

[0019] This utility model has the following advantages: By symmetrically placing hydraulic traction trolleys on the outside of the pipe sections, replacing the multi-component rigid frame of the existing technology, the structure of the device is simplified; the hydraulic drive components are integrated on the trolley, reducing assembly steps and solving the problem of cumbersome assembly of multiple components such as "limiting pipe clamps + jacking frame + steel cable ring" in the comparative patent; the combination of ring slings and hooks enables rapid connection to the outside of the pipe sections, and with the hydraulic retraction action, the daily installation efficiency of a 10-person team is increased to 12-14 sections, overcoming the defect of low installation efficiency.

[0020] The flexible closed-loop structure of the ring sling adapts to the curvature of the outer wall of the pipe section, avoiding damage to the outer wall of the pipe section caused by rigid connection; the quick-connect locking device enables rapid installation within 30 seconds, solving the problem of time-consuming bolt connection half hoop in the comparative patent, and further simplifying the operation steps.

[0021] The adjusting chain can flexibly adjust its length according to the initial spacing between new and old pipe sections, improving its adaptability to different construction scenarios; the hook-and-loop structure between the traction hook and the end of the pipe section to be installed significantly shortens the installation time and greatly improves the ease of operation compared to the connection method of the steel cable loop around the limiting groove in the comparative patent.

[0022] By using an arc-shaped support plate to bear a small amount of the pipe section's weight, and coordinating with the crane for hoisting, a "hoisting + support" collaborative positioning is formed, reducing pipe section swaying and solving the problem of easy displacement in traditional single crane positioning; the elastic buffer absorbs the impact of hoisting, avoiding damage to the outer wall of the pipe section caused by rigid contact.

[0023] Operators can remotely control the system from a safe distance, avoiding the risks of close-range operation and solving the safety hazards of traditional pipeline (pipe section) operation; wireless control reduces cable entanglement and further simplifies the operation process. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of this utility model.

[0025] Figure 2 yes Figure 1 The left view.

[0026] Figure 3 This is a bottom view of the structure of this utility model.

[0027] Figure 4 This is a three-dimensional structural diagram of the present invention. Detailed Implementation

[0028] In this invention, the old pipe section refers to a pipe section that has already been installed, and the new pipe section refers to a pipe section to be installed. Once the new pipe section is installed, it becomes the old pipe section.

[0029] like Figures 1 to 4 As shown, this utility model provides a mobile large-diameter ductile iron pipe installation device, including two hydraulic pulling trolleys 1, a hydraulic drive assembly 2 (double-acting hydraulic cylinder), an old pipe section connection assembly 3 (ring sling) and a new pipe section connection assembly 4 (hook). The hydraulic traction trolley 1 is symmetrically arranged on the left and right outer sides of the pipe section 56 to be installed along the pipeline axis, and is in active contact with the sand cushion layer at the bottom of the installation trench. The hydraulic drive assembly 2 is fixedly installed on the hydraulic traction trolley 1 in a one-to-one correspondence. Its power output end is movably connected to the end of the pipe section 56 to be installed through the new pipe section connection assembly 4, and its power input end is fixedly connected to the outer wall of the installed pipe section 57 through the old pipe section connection assembly 3. The hydraulic drive assembly 2 pulls the pipe section 56 to be installed axially by retracting, so that the spigot of the pipe section 56 to be installed is inserted into the socket of the installed pipe section 57. The reference numeral 23 in the attached figure indicates the hydraulic station that is matched with the hydraulic drive assembly 2. The two are connected by a hydraulic hose 24 with redundant length.

[0030] The hydraulic traction trolley 1 is equipped with wear-resistant rubber wheels 91 at its bottom, which roll in contact with the sand cushion layer. The hydraulic drive assembly 2 is a double-acting hydraulic cylinder, with the cylinder diameter adapted to the weight of the pipe section (e.g., for a DN2000 pipe section, the cylinder diameter can be selected as 160mm). The old pipe section connection assembly 3 is a ring-shaped sling made of high-strength polyester braid, with a width of 50-80mm. The ring-shaped sling (i.e., the old pipe section connection assembly 3) wraps around the pipe body (outer wall) of the installed pipe section 57, forming a closed-loop clamping state through quick-connect buckles or connectors (such as shackles, eye bolts, etc.), thereby transmitting the pulling force of the hydraulic cylinder to the installed pipe section 57. The new pipe section connection assembly 4 is an alloy steel forged hook with anti-slip teeth on the hook head.

[0031] Hydraulic cylinder 2 reciprocates under the control of hydraulic station 23. When hydraulic drive assembly 2 retracts, the pulling force is transmitted to the installed pipe section 57 through the ring sling (3). At the same time, the new pipe section connecting assembly 4 (hook) pulls the pipe section 56 to be installed, dragging the pipe section 56 to be installed towards the installed pipe section 57. Utilizing the stability of the hydraulic drive force, the new pipe section overcomes the friction of the rubber ring inside the socket under the action of axial tension, realizing the smooth insertion of the spigot into the socket and completing the sealing connection. The symmetrically arranged trolley (1) balances the radial force and avoids pipe section offset.

[0032] By symmetrically setting the hydraulic traction trolley 1 on the outside of the pipe section, replacing the multi-component rigid frame of the prior art, the structure of the device is simplified; the hydraulic drive component 2 is integrated on the trolley, reducing the assembly steps and solving the problem of cumbersome assembly of multiple components such as "limiting pipe clamp + jacking frame + steel cable ring" in the comparative patent; the combination connection of the ring sling (3) and the hook (4) realizes the rapid connection outside the pipe section, and with the hydraulic retraction action, the daily installation efficiency of a 10-person team is increased to 12-14 sections, overcoming the defect of low installation efficiency.

[0033] The old pipe section connection assembly 3 includes an annular sling and a locking component; the annular sling is sleeved on the outer wall of the installed pipe section 57, and its two ends are detachably and fixedly connected by the locking component to form a closed loop structure; the middle part of the annular sling is hinged to the power input end of the hydraulic drive assembly 2.

[0034] The locking mechanism is a quick-connect buckle with a locking pin; the inner wall of the annular sling is lined with a nitrile rubber pad with a friction coefficient ≥0.6 to prevent slippage relative to the pipe section during pulling. The quick-connect buckle is a standard part and is not shown in the figure.

[0035] The flexible closed-loop structure of the ring sling adapts to the curvature of the outer wall of the pipe section, avoiding damage to the outer wall of the pipe section caused by rigid connection; the quick-connect locking device enables rapid installation within 30 seconds, solving the problem of time-consuming bolt connection half hoop in the comparative patent, and further simplifying the operation steps.

[0036] The new pipe section connection assembly 4 includes a pull hook (the position indicated by reference numeral 4 in the attached drawing) and an adjusting chain 42. The hook head of the pull hook is movably connected to the end wall of the pipe section 56 to be installed, and the tail is detachably connected to the power output end of the hydraulic drive assembly 2 via the adjusting chain 42. The length of the chain links of the adjusting chain 42 is adjustable to accommodate pipe sections of different lengths. The adjusting chain 42 is a plate chain with a pitch of 15mm and 5 to 8 adjustment positions. The length of the adjusting chain 42 can be flexibly adjusted according to the initial spacing between the new and old pipe sections, improving adaptability to different construction scenarios. Compared with the connection method of the steel cable loop bypassing the limiting groove in the comparative patent, the hook connection structure between the pull hook and the end of the pipe section 56 to be installed significantly shortens the installation time and significantly improves the ease of operation.

[0037] The hydraulic traction trolley 1 also includes a load-bearing support assembly. This assembly includes an arc-shaped support plate and an elastic buffer on the top of the hydraulic traction trolley 1, located on the side where it connects to the pipe section 56 to be installed. The arc-shaped support plate is movably connected to the frame of the hydraulic traction trolley 1 via the elastic buffer, and its arc surface fits against the outer wall of the pipe section 56 to bear part of its weight. The arc-shaped support plate is made of Q235 steel plate, stamped and formed, with an arc consistent with the curvature of the pipe section's outer wall. The elastic buffer is a cylindrical helical spring with a compression of 5-10 mm and a load capacity of 500-800 kg / trolley. The arc-shaped support plate and elastic buffer are conventional structures and are not shown in the figure. By using the arc-shaped support plate to bear a small portion of the pipe section's weight, combined with crane lifting, a "lifting + support" collaborative positioning is formed, reducing pipe section sway and solving the problem of easy displacement in traditional single-crane positioning. The elastic buffer absorbs the lifting impact, avoiding damage to the outer wall of the pipe section caused by rigid contact.

[0038] It also includes a remote control unit; the remote control unit is electrically connected to the hydraulic drive assembly 2 and is used to control the extension and retraction and start / stop of the hydraulic drive assembly 2. The remote control unit uses a remote controller with a communication distance of ≥50m and is equipped with an emergency stop button; the hydraulic drive assembly 2 has a built-in solenoid valve group that receives control signals to switch actions. The remote controller uses conventional technology and is not shown in the figure. Operators can remotely control the system from a safe distance, avoiding the risks of close-range operation and solving the safety hazards of traditional pipeline (pipe section) operations; wireless control reduces cable entanglement and further simplifies the operation process.

[0039] The working process of this utility model is as follows: I. Construction preparation stage.

[0040] Site cleanup and equipment inspection: Clean up debris in the installation trench and ensure that the compacted sand cushion layer at the bottom of the trench is flat; inspect the hydraulic traction trolley 1 (the bottom wear-resistant rubber wheel 91 rotates flexibly without jamming), hydraulic drive assembly 2 (double-acting hydraulic cylinder, cylinder diameter 160mm, adapted for DN2000 pipe section), old pipe section connection assembly 3 (the ring sling is undamaged, and the locking fastener quick-plug buckle lock pin function is normal), new pipe section connection assembly 4 (the traction hook anti-slip teeth are intact, the adjusting chain 42 plate chain pitch is 15mm, and 5-8 adjustable gears are flexible and adjustable), and remote control unit (the remote control communication distance is ≥50m, and the emergency stop button responds normally).

[0041] New pipe section hoisting and positioning: The new pipe section to be installed is hoisted to the front of the socket of the old pipe section by a crane. The length of the crane hoisting rope is adjusted so that the axis of the new pipe section is aligned with the axis of the old pipe section. The bottom of the new pipe section is about 100mm away from the sand cushion layer, ready to be lowered onto the load-bearing support component of the hydraulic traction trolley 1.

[0042] II. Positioning and load-bearing support of the hydraulic traction trolley.

[0043] Trolley movement and positioning: Push the hydraulic pull trolley 1, and use the wear-resistant rubber wheel 91 at the bottom to roll on the sand cushion layer to arrange the two trolleys symmetrically on the left and right sides of the new pipe section along the pipe axis (with the axis of the new pipe section as the center and the distance between the two sides is equal), ensuring that the central axis of the trolley frame is parallel to the axis of the new pipe section.

[0044] Load-bearing support assembly docking: The crane is operated to slowly lower the new pipe section, so that the outer wall of the new pipe section fits against the arc-shaped support plate (Q235 steel plate stamped and formed, the curvature of which is consistent with the curvature of the outer wall of the new pipe section) on the top of the hydraulic traction trolley 1. At this time, the arc-shaped support plate is pressed down by the elastic buffer (cylindrical helical spring, compression amount 5-10mm) to bear part of the weight of the new pipe section (each trolley bears 500-800kg).

[0045] Working principle: The curved surface of the arc-shaped support plate fits against the outer wall of the new pipe section, forming a line contact support to avoid local stress concentration; the elastic buffer absorbs the impact load when the crane is lowered, preventing the outer wall of the new pipe section from being damaged by rigid collision.

[0046] Technical effect: Through the coordinated positioning of "crane hoisting + trolley support", the new pipe section is stable in posture and the radial sway is reduced to ±5mm, which solves the problem that traditional single crane positioning is easily affected by wind force and the extension and contraction of the hoisting rope, resulting in displacement.

[0047] III. Installation of old pipe section connection components.

[0048] Circular sling wrapping and closed-loop fixing: The circular sling (high-strength polyester braid, 50-80mm wide) in the old pipe section connecting assembly 3 is wrapped around the outer wall of the installed pipe section 57 (old pipe section) to make the nitrile rubber pad (friction coefficient ≥0.6) on the inner wall of the circular sling tightly fit with the outer wall of the old pipe section. The two ends are connected by locking parts (quick-fit buckles with locking pins) to form a closed-loop clamping state.

[0049] Connection to the hydraulic drive assembly: Hinge the middle part of the ring sling (the symmetrical center of the closed-loop structure) to the power input end (piston rod tail lug) of the hydraulic drive assembly 2 (double-acting hydraulic cylinder) using a shackle, ensuring that the hinge point is located on the horizontal extension line of the old pipe section axis.

[0050] Working principle: The closed-loop structure of the ring sling grips the outer wall of the old pipe section through friction. The locking pin of the quick-release buckle prevents it from loosening during the pulling process, and the pulling force of the hydraulic drive component 2 is evenly transmitted to the pipe body of the old pipe section.

[0051] Technical benefits: The flexible ring sling adapts to the curvature of the outer wall of the old pipe section, avoiding the squeezing damage to the outer wall of the pipe section caused by rigid connections (such as the limiting clamp in the comparative patent); the quick-connect buckle enables rapid installation within 30 seconds, which significantly shortens the assembly time compared to the bolt connection half clamp in the comparative patent (which requires tightening the bolts one by one), and significantly improves the ease of operation.

[0052] IV. Installation of new pipe section connection components.

[0053] Pull hook connection: The pull hook (forged alloy steel with anti-slip teeth) in the new pipe section connection assembly 4 hooks onto the preset lifting lug or outer wall end of the new pipe section end, ensuring a stable connection without slippage.

[0054] Connection of the adjusting chain to the hydraulic drive assembly: Adjust the number of chain links of the adjusting chain 42 (which can be a plate chain with a pitch of 15mm and 5 to 8 adjustment positions, or can directly use a redundant steel wire rope, matching different pipe section lengths by tying different parts of the steel wire rope) according to the actual distance, so that the tail of the pulling hook is detachably connected to the power output end (cylinder front end eyelet) of the hydraulic drive assembly 2 through the eye bolt. After connection, the adjusting chain 42 is in a horizontal tension state (droop ≤10mm).

[0055] Working principle: The anti-slip teeth of the pulling hook engage with the end wall of the new pipe section, and in conjunction with the rigid force transmission of the adjusting chain 42, the contraction pulling force of the hydraulic drive component 2 is directly transmitted to the axial center of the new pipe section.

[0056] Technical benefits: The multi-position design of the adjustment chain 42 can adapt to different initial spacings (stepless adjustment within the range of 300-500mm), adapting to the changes in pipe section spacing caused by differences in the flatness of the sand cushion layer during construction; compared with the connection method of "steel cable loop around the top push frame limit groove" in the comparison patent, the hooking operation of the pull hook only needs 1 person 1 minute to complete, greatly shortening the installation time.

[0057] V. Hydraulic drive and pipe section docking operation.

[0058] Remote control start-up: The operator holds a remote control unit (remote controller, communication distance ≥ 50m), stands in a safe area more than 5m away from the pipe section docking point, and presses the "retract" button. The remote control unit sends an electrical signal to the solenoid valve group built into the hydraulic drive component 2.

[0059] Hydraulic drive assembly retraction and pulling: Oil enters the rodless chamber of hydraulic drive assembly 2 (double-acting hydraulic cylinder, cylinder diameter 160mm), and the piston rod drives the power output end to retract towards the power input end, generating axial tension (for DN2000 pipe sections, the tension can reach 80kN).

[0060] Force transmission path: Hydraulic drive assembly 2 retracts → Adjusting chain 42 pulls the pull hook → New pipe section moves axially towards old pipe section → The spigot of the new pipe section gradually approaches the socket of the old pipe section.

[0061] The rubber ring inside the socket is squeezed and sealed: As the hydraulic drive assembly 2 continues to contract, the spigot of the new pipe section (which may have a rubber flange on the outer wall) is inserted into the socket of the old pipe section (which may have a rubber sealing ring on the inner wall), overcoming the friction of the rubber sealing ring, until the insertion depth of the spigot reaches the design value (usually 150-200mm). At this time, the remote control unit displays that the hydraulic cylinder stroke has reached the preset value, and the operator presses the "stop" button.

[0062] Working principle: The hydraulic driving force of the double-acting hydraulic cylinder is stable (pressure fluctuation ≤ ±0.5MPa), ensuring that the axial movement speed of the new pipe section is uniform (50mm / s) and avoiding damage to the rubber seal ring caused by impact load; the two symmetrically arranged hydraulic traction trolleys 1 generate equal and opposite pulling forces, balancing the radial force of the new pipe section and making the coaxiality deviation between the spigot and the socket ≤2mm.

[0063] Technical benefits: The retraction action of hydraulic drive component 2 can complete the pipe section connection in one go. Compared with the operation process of "repeated adjustment and pulling" of traditional electric hoists in pipelines, the connection time of a single pipe section is shortened to 3 minutes, and the daily installation efficiency of a 10-person team is increased to 12-14 sections, overcoming the shortcomings of low installation efficiency of existing technologies. Operators can be remotely controlled to evacuate to a safe area to avoid close contact with the stressed parts, thus solving the safety risks caused by the unhooking of traditional hand chain hoists.

[0064] VI. Equipment evacuation and preparation for the next section.

[0065] Hydraulic drive assembly extension and reset: Operate the remote control unit to allow oil to enter the rod chamber of the hydraulic drive assembly 2, extend the piston rod, and drive the new pipe section connecting assembly 4 to separate from the end of the new pipe section, releasing the clamping force between the annular sling and the outer wall of the old pipe section.

[0066] Disassembly of connecting components and removal of the trolley: Loosen the locking mechanism of the ring sling and remove the old pipe section connecting component 3 from the outer wall of the old pipe section; release the hook from the end of the new pipe section and restore the adjusting chain 42 to its longest position. Push the hydraulic pulling trolley 1 and use the wear-resistant rubber wheel 91 to roll on the sand cushion layer to remove it to the installation position of the next new pipe section.

[0067] New pipe section transformed into old pipe section: At this point, the new pipe section that has been connected is fixed on the sand cushion layer and becomes the "old pipe section" of the next pipe section to be installed 56. Repeat the above steps to install the subsequent pipe sections.

[0068] VII. Work Process Summary.

[0069] This technology achieves efficient and safe installation of large-diameter ductile iron pipes through a process of "trolley support and positioning → connecting old pipe sections with ring slings → connecting new pipe sections with pull hooks → hydraulic retraction docking → remote control operation". The core technological benefits are: ① Simplified device structure (eliminating components such as limiting clamps and jacking frames found in comparative patents), reducing assembly time by 60%; ② Increased installation efficiency by 3-4 times (10 people / day can install 12-14 sections); ③ Operators are kept away from hazardous areas, reducing the accident rate to zero; ④ High docking accuracy (coaxiality deviation ≤2mm), achieving 100% compliance with pipe sealing performance standards.

[0070] The above embodiments are only used to illustrate and not limit the technical solutions of this utility model. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the utility model without departing from the spirit and scope of the utility model. Any modifications or partial substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A mobile installation device for large-diameter ductile iron pipes, characterized in that: It includes two hydraulic traction trolleys (1), a hydraulic drive assembly (2), an old pipe section connection assembly (3), and a new pipe section connection assembly (4). The hydraulic traction trolley (1) is symmetrically arranged on the left and right sides of the pipe section (56) to be installed along the pipeline axis and is in active contact with the sand cushion layer at the bottom of the installation trench. The hydraulic drive assembly (2) is fixedly installed on the hydraulic traction trolley (1) in a one-to-one correspondence. Its power output end is movably connected to the end of the pipe section (56) to be installed through the new pipe section connection assembly (4), and its power input end is fixedly connected to the outer wall of the installed pipe section (57) through the old pipe section connection assembly (3). The hydraulic drive assembly (2) pulls the pipe section (56) to be installed along the axial direction by the contraction action, so that the socket of the pipe section (56) to be installed is inserted into the socket of the installed pipe section (57).

2. The mobile large-diameter ductile iron pipe installation device according to claim 1, characterized in that: The old pipe section connection assembly (3) includes an annular sling and a locking member; the annular sling is sleeved on the outer wall of the installed pipe section (57), and its two ends are detachably fixedly connected by the locking member to form a closed loop structure; the middle part of the annular sling is hinged to the power input end of the hydraulic drive assembly (2).

3. The mobile large-diameter ductile iron pipe installation device according to claim 1, characterized in that: The new pipe section connection assembly (4) includes a pull hook and an adjusting chain (42); the hook head of the pull hook is movably connected to the end wall of the pipe section (56) to be installed, and the tail is detachably connected to the power output end of the hydraulic drive assembly (2) through the adjusting chain (42); the length of the chain link of the adjusting chain (42) is adjustable to adapt to pipe sections of different lengths.

4. The mobile large-diameter ductile iron pipe installation device according to claim 1, characterized in that: The hydraulic traction trolley (1) also includes a load-bearing support assembly; the load-bearing support assembly includes an arc-shaped support plate and an elastic buffer on the top of the hydraulic traction trolley (1); the arc-shaped support plate is movably connected to the frame of the hydraulic traction trolley (1) through the elastic buffer, and its arc surface fits against the outer wall of the pipe section (56) to be installed, bearing part of the weight of the pipe section.

5. The mobile large-diameter ductile iron pipe installation device according to claim 1, characterized in that: It also includes a remote control unit; the remote control unit is electrically connected to the hydraulic drive assembly (2) and is used to control the extension and retraction and start and stop of the hydraulic drive assembly (2).

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