Hydraulic trolley for quickly mounting nodular cast iron pipe and construction method

Abstract

The invention relates to the technical field of pipeline installation, and discloses a nodular cast iron pipe rapid installation hydraulic trolley and a construction method.The nodular cast iron pipe rapid installation hydraulic trolley comprises an installation frame, a connecting rod is rotationally connected to the interior of the installation frame, rollers are fixedly connected to the outer wall of the connecting rod, and a first telescopic rod is fixedly connected to the outer wall of the left side of the installation frame; an anti-skid assembly is fixedly connected to the outer wall of the right side of the first telescopic rod, a supporting assembly is fixedly connected to the upper surface of the anti-skid assembly, a pushing assembly is fixedly connected to the outer wall of the supporting assembly, an expanding assembly is fixedly connected to the outer wall of the pushing assembly, and fixing assemblies are fixedly connected to the outer walls of the two sides of the mounting frame. The hydraulic cylinder and the telescopic rod cooperate to push the expanding assembly to enter the pipeline, the motor is combined to drive a meshing mechanism of a fluted disc and a sliding block, the inner wall of the pipeline is evenly expanded and positioned by the mounting pad, the trolley flexibly moves along the axis of the pipeline through the rollers and the universal wheels, the manual adjusting time is effectively shortened, and the mounting error is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline installation, and specifically to a hydraulic trolley for rapid installation of ductile iron pipes and a construction method thereof. Background Art

[0002] In the infrastructure construction fields such as municipal engineering and water conservancy projects, ductile iron pipes have become commonly used materials for pipeline laying due to their high strength, corrosion resistance, and convenient construction. Their installation quality directly affects the sealing performance, durability, and operation safety of the pipeline system. Therefore, efficient and precise installation technology is the research focus in this field.

[0003] After retrieval, in the publication number: CN112197063B, an installation device and construction method for ductile iron pipes are disclosed, including two connection components for connecting pipelines and a stretching component. The stretching component includes a movable pulley connected to one of the connection components, a fixed pulley connected to the other connection component, and a guiding pulley. The fixed pulley is connected with a cable; the cable is led out from the fixed pulley, then sequentially sleeved on the movable pulley, and finally sleeved on the lower side of the guiding pulley and extends upward. The movable pulley is provided with a safety component to reduce the risk of the connection component it connects slipping relative to the pipeline. The fixed pulley and the guiding pulley are also provided with safety components. This application can relatively conveniently install pipelines and relatively save manpower and material resources.

[0004] Existing ductile iron pipe installation equipment lacks an automated mechanism that integrates power drive, inner wall expansion support, and precise positioning. As a result, it is difficult to achieve uniform force application and rapid positioning of the installation pad on the inner wall during pipeline docking, resulting in low docking efficiency and large installation errors, and unable to meet the requirements of modern projects for pipeline installation accuracy and efficiency. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a hydraulic trolley for rapid installation of ductile iron pipes and a construction method thereof, which solves the problem that existing ductile iron pipe installation equipment lacks an automated mechanism that integrates power drive, inner wall expansion support, and precise positioning.

[0006] To achieve the above objectives, the present invention is realized through the following technical solutions: A hydraulic trolley for rapid installation of ductile iron pipes includes an installation frame. A connecting rod is rotatably connected inside the installation frame. A roller is fixedly connected to the outer wall of the connecting rod. The outer wall of the connecting rod is rotatably connected inside the installation frame. A first telescopic rod is fixedly connected to the left outer wall of the installation frame. An anti-slip component is fixedly connected to the right outer wall of the first telescopic rod. A support component is fixedly connected to the upper surface of the anti-slip component. A pushing component is fixedly connected to the outer wall of the support component. An expansion support component is fixedly connected to the outer wall of the pushing component. Fixed components are fixedly connected to both outer walls of the installation frame.

[0007] By adopting the above technical solution, the flexible contact structure of the expanding component can adapt to the inner walls of ductile iron pipes with different diameters, realizing uniform force application to the inner walls of the pipes, solving the problem that existing equipment cannot apply force uniformly, ensuring that the installation pad is closely attached to the inner wall of the pipe, and improving the sealing performance; the fixing components on the outer walls of both sides of the installation frame can be respectively fixedly connected to the ends of the ductile iron pipes to be butt-jointed. Through the coordinated action of the fixing components on both sides, the accurate alignment of the pipe axes is achieved. Combining with the positioning function of the expanding component, the butt-joint error is significantly reduced, and the installation accuracy is improved; the whole set of mechanism integrates power drive, inner wall expansion and accurate positioning functions through a hydraulic system, realizes automatic operation, reduces manual intervention, greatly improves the pipe butt-joint efficiency, and meets the dual requirements of modern engineering for installation accuracy and efficiency.

[0008] Preferably, the anti-slip component includes a connecting plate, the outer wall of the connecting plate is fixedly connected to the right outer wall of the first telescopic rod, a non-slip plate is rotatably connected inside the connecting plate, and a foot pedal is fixedly connected to the outer wall of the non-slip plate.

[0009] Preferably, the fixing component includes a second connecting block, the outer wall of the second connecting block is fixedly connected to the outer wall of the installation frame, a fixing ring is arranged inside the second connecting block, and a rope is fixedly connected to the outer wall of the fixing ring.

[0010] Preferably, the supporting component includes a supporting plate, the lower surface of the supporting plate is fixedly connected to the upper surface of the connecting plate, a handle is fixedly connected to the left outer wall of the supporting plate, and a fixing plate is fixedly connected to the right outer wall of the supporting plate.

[0011] Preferably, the pushing component includes a hydraulic cylinder, the outer wall of the hydraulic cylinder is fixedly connected to the right outer wall of the supporting plate, the output end of the hydraulic cylinder is connected to a first connecting column, a second telescopic rod is fixedly connected to the outer wall of the fixing plate, a fixing disk is fixedly connected to the right outer wall of the second telescopic rod, and a supporting shell is fixedly connected to the right outer wall of the fixing disk.

[0012] Preferably, the expanding component includes a motor, the left outer wall of the motor is fixedly connected to the right outer wall of the first connecting column, the output end of the motor is connected to a second connecting column, a toothed disk is fixedly connected to the right outer wall of the second connecting column, the tooth end of the toothed disk is meshed with a sliding block, a first connecting block is fixedly connected to the outer wall of the sliding block, and an installation pad is fixedly connected to the outer wall of the first connecting block.

[0013] Preferably, universal wheels are arranged on the lower inner wall of the installation frame, and the universal wheels are symmetrically distributed at the four corners of the bottom of the installation frame.

[0014] Preferably, the installation pad is made of high-elastic rubber and has anti-slip patterns on its surface.

[0015] Preferably, the outer wall of the toothed disc is rotatably connected to the inside of the support shell, and the outer wall of the sliding block is slidably connected to the inner wall of the support shell.

[0016] Preferably, a construction method of a hydraulic trolley for rapid installation of ductile iron pipes includes the following steps: S1. Clean the construction area to ensure that the ground flatness error ≤ 3 mm. Push the trolley to the pipeline axis direction through the four-wheel universal wheels at the bottom of the installation frame, and adjust the rollers to be parallel to the pipeline laying path. S2. Manually pull the handle according to the size of the ductile iron pipe. The handle will drive the first telescopic rod to stretch. Install the ductile iron pipe on the upper surface of the installation frame through a crane, and fix the ductile iron pipe by pulling the rope to prevent it from falling off. Apply pressure to the foot pedal to make the anti-slip plate generate friction with the ground. S3. First, start the hydraulic cylinder. The hydraulic cylinder will drive the first connecting column to slide. While the first connecting column slides, it will drive the expansion and support assembly to slide, and the second telescopic rod will also expand and contract. Stretch the expansion and support assembly into the inside of the ductile iron pipe. Then start the motor. The motor rotates to drive the second connecting column to rotate. The rotation of the second connecting column will drive the toothed disc to rotate. Since the toothed disc is threadedly connected to the sliding block, it will drive the sliding block to slide on the inner wall of the support shell, and at the same time drive the first connecting block and the installation pad to slide until the installation pad contacts the inside of the ductile iron pipe. S4. When pipeline docking is required, start the hydraulic cylinder again to drive the expansion and support assembly to slide. Finally, the expansion and support assembly will drive the ductile iron pipe to slide on the outer wall of the connecting rod, align with another ductile iron pipe, and make the sealing rubber ring of the socket and the butt joint pipe mouth fit perfectly. S5. After docking is completed, turn off the motor. The reverse rotation of the toothed disc drives the sliding block to retract, and the installation pad disengages from the inner wall of the pipeline; contract the hydraulic cylinder and the second telescopic rod to reset the pushing assembly, loosen the rope of the fixing assembly, retract the anti-slip plate, and move the trolley to the next working station through the universal wheels.

[0017] The present invention provides a hydraulic trolley for rapid installation of ductile iron pipes and a construction method. It has the following beneficial effects: 1. Through the synergistic action of the hydraulic cylinder and the telescopic rod, the present invention pushes the expansion and support assembly into the pipeline interior, and combines the meshing mechanism of the motor-driven toothed disc and the sliding block to achieve uniform expansion and positioning of the installation pad on the inner wall of the pipeline, significantly improving the pipeline docking efficiency; the rollers and universal wheels enable the trolley to move flexibly along the pipeline axis, ensuring rapid alignment of the socket and the sealing rubber ring, effectively reducing the manual adjustment time and reducing the installation error.

[0018] 2. The anti-slip component of the present invention triggers the friction between the anti-slip plate and the ground by stepping on it, combined with the locking function of the universal wheels at the four corners of the bottom of the installation frame, preventing the trolley from shifting during construction and ensuring the operation stability; the fixing component uses adjustable ropes in cooperation with fixing rings to adapt to the binding requirements of ductile iron pipes with different pipe diameters and avoid the risk of pipe shedding; the surface of the installation pad made of high-elastic rubber material is provided with anti-slip patterns, which can not only adapt to the difference in the inner diameter of the pipe to achieve non-destructive expansion support, but also provide reliable friction force.

[0019] 3. The grip of the support component of the present invention facilitates manually adjusting the length of the first telescopic rod to quickly adapt to the pipe size. The integrated design of the pushing component and the expansion support component simplifies the operation process and reduces the labor intensity of workers; the construction method has clear steps, and the trolley positioning, pipe fixing and expansion docking are all completed through standardized processes, shortening the construction period and improving the repeatability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a three-dimensional structural schematic diagram of the present invention; Figure 2 is a partial structural schematic diagram of the first telescopic rod of the present invention; Figure 3 is a partial structural schematic diagram of the anti-slip component of the present invention; Figure 4 is of the present invention Figure 2 the enlarged schematic diagram at A in; Figure 5 is a partial structural schematic diagram of the fixing plate of the present invention; Figure 6 is a partial structural schematic diagram of the second telescopic rod of the present invention; Figure 7 is a partial structural schematic diagram of the expansion support component of the present invention; Figure 8 is a partial structural schematic diagram of the gear disc of the present invention.

[0021] Wherein, 1. Installation frame; 2. Connecting rod; 3. Roller; 4. First telescopic rod; 5. Anti-slip component; 51. Connecting plate; 52. Anti-slip plate; 53. Foot pedal; 6. Support component; 61. Support plate; 62. Grip; 63. Fixing plate; 7. Pushing component; 71. Hydraulic cylinder; 72. First connecting column; 73. Second telescopic rod; 74. Fixed disk; 75. Support shell; 8. Expansion support component; 81. Motor; 82. Second connecting column; 83. Gear disc; 84. Sliding block; 85. First connecting block; 86. Installation pad; 9. Fixing component; 91. Second connecting block; 92. Fixing ring; 93. Rope. DETAILED DESCRIPTION OF THE INVENTION

[0022] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Please see attached Figure 1 -Attached Figure 3 An embodiment of the present invention provides a hydraulic trolley for quick installation of ductile iron pipes, including an installation frame 1, a connecting rod 2 is rotatably connected inside the installation frame 1, a roller 3 is fixedly connected to the outer wall of the connecting rod 2, the outer wall of the connecting rod 2 is rotatably connected to the inside of the installation frame 1, a telescopic rod 4 is fixedly connected to the left outer wall of the installation frame 1, an anti-skid component 5 is fixedly connected to the right outer wall of the telescopic rod 4, a support component 6 is fixedly connected to the upper surface of the anti-skid component 5, a pushing component 7 is fixedly connected to the outer wall of the supporting component 6, an expansion component 8 is fixedly connected to the outer wall of the pushing component 7, and a fixing component 9 is fixedly connected to the outer walls of both sides of the installation frame 1.

[0024] Specifically, after moving the installation frame 1 to the construction position, the operator steps on the anti-slip component 5 to fix the trolley, and then manually adjusts the support component 6, stretching it to fit the size of the ductile iron pipe. Subsequently, the pipe is placed on the upper surface of the installation frame 1 using a crane, and the pipe is bound by the fixing component 9 to prevent it from falling off. The pushing component 7 is started to drive the expansion component 8 to move inside the pipe, and then the expansion component 8 is started to expand and fix the pipe. When the pipes are docked, the pushing component 7 continues to push the expansion component 8, and the expansion component 8 will drive the pipe to align with the socket of the other pipe to ensure that the sealing rubber ring is fully fitted. After the docking is completed, the pushing component 7 and the expansion component 8 are started to reset, and the trolley is moved to the next workstation by moving the installation frame 1.

[0025] Please see attached Figure 2 and attached Figure 3 The anti-skid assembly 5 includes a connecting plate 51, the outer wall of the connecting plate 51 is fixedly connected to the right outer wall of the telescopic rod 4, the inner part of the connecting plate 51 is rotatably connected to an anti-skid plate 52, and the outer wall of the anti-skid plate 52 is fixedly connected to a pedal 53; the universal wheels are symmetrically distributed at the four corners of the bottom of the installation frame 1.

[0026] Specifically, the anti-skid component 5 transmits the operator's stepping force on the pedal 53 to the anti-skid plate 52 through the connecting plate 51, so that it is pressed down and close to the ground, and the friction force is used to stabilize the position of the trolley, effectively preventing sliding or displacement during construction, avoiding the risk of pipeline deviation or dumping due to accidental movement of the trolley, and ensuring the precise docking of the ductile iron pipe through stable support, reducing installation errors. In addition, the operation of the pedal 53 is intuitive and simple, which greatly shortens the construction preparation time.

[0027] Please see attachedFigure 2 - Appendix Figure 4 , the fixing component 9 includes a second connecting block 91, the outer wall of the second connecting block 91 is fixedly connected to the outer wall of the installation frame 1, a fixing ring 92 is arranged inside the second connecting block 91, and a rope 93 is fixedly connected to the outer wall of the fixing ring 92; the supporting component 6 includes a supporting plate 61, the lower surface of the supporting plate 61 is fixedly connected to the upper surface of the connecting plate 51, a handle 62 is fixedly connected to the left outer wall of the supporting plate 61, and a fixing plate 63 is fixedly connected to the right outer wall of the supporting plate 61.

[0028] Specifically, the fixing component 9 is composed of a second connecting block 91, a fixing ring 92 and a rope 93. Among them, the second connecting block 91 is fixed to the outer wall of the installation frame 1 by a rigid connection method to form a force-bearing support point. The built-in fixing ring 92 serves as the anchoring core of the rope 93. By manually tightening the rope 93, the binding and fixing of the ductile iron pipe can be quickly completed. The rope 93 can be freely adjusted in tightness to adapt to the fixing requirements of pipes with different diameters.

[0029] The left outer wall of the supporting plate 61 is integrated with a handle 62, which is convenient for the operator to manually adjust the stretching amplitude of the first telescopic rod 4. The fixing plate 63 is used to ensure the accurate alignment and stable operation of the hydraulic cylinder 71 and the second telescopic rod 73.

[0030] Please refer to Appendix Figure 5 - Appendix Figure 7 , the pushing component 7 includes a hydraulic cylinder 71, the outer wall of the hydraulic cylinder 71 is fixedly connected to the right outer wall of the supporting plate 61, the output end of the hydraulic cylinder 71 is connected to a first connecting column 72, the outer wall of the fixing plate 63 is fixedly connected to a second telescopic rod 73, the right outer wall of the second telescopic rod 73 is fixedly connected to a fixing disk 74, and the right outer wall of the fixing disk 74 is fixedly connected to a supporting shell 75.

[0031] Specifically, the hydraulic cylinder 71 is fixed to the right outer wall of the supporting plate 61 by bolts to form a rigid support reference. The output end of the hydraulic cylinder 71 drives the first connecting column 72 to move linearly along the axis, directly driving the expanding component 8 to push into the ductile iron pipe. At the same time, the second telescopic rod 73 installed on the outer wall of the fixing plate 63 expands synchronously, and the supporting shell 75 restricts the movement trajectory of the expanding component 8 through an internal linear bearing to ensure the meshing accuracy of the gear disk 83 and the sliding block 84. This design ensures the axial centering of the supporting shell 75 inside the pipe through the stroke linkage of the hydraulic cylinder 71 and the second telescopic rod 73, avoiding damage to the pipe wall caused by eccentric loading.

[0032] Please refer to Appendix Figure 7 - Appendix Figure 8, the expansion support assembly 8 includes a motor 81. The left outer wall of the motor 81 is fixedly connected to the right outer wall of the first connecting column 72. The output end of the motor 81 is connected to a second connecting column 82. The right outer wall of the second connecting column 82 is fixedly connected to a gear disk 83. The tooth end of the gear disk 83 is meshed and connected to a sliding block 84. The outer wall of the sliding block 84 is fixedly connected to a first connecting block 85. The outer wall of the first connecting block 85 is fixedly connected to a mounting pad 86; the mounting pad 86 is made of high-elasticity rubber and has anti-slip patterns on its surface; the outer wall of the gear disk 83 is rotatably connected inside the support shell 75, and the outer wall of the sliding block 84 is slidably connected to the inner wall of the support shell 75; the lower inner wall of the mounting frame 1 is provided with universal wheels.

[0033] Specifically, the motor 81 is a stepper motor. When the motor 81 is started, the output end drives the second connecting column 82 to rotate, driving the gear disk 83 to rotate around the axis inside the support shell 75. The spiral tooth pattern on the outer edge of the gear disk 83 is precisely matched with the meshing groove of the sliding block 84, converting the rotational motion into the linear displacement of the sliding block 84 along the inner wall of the support shell 75. The sliding block 84 is rigidly connected to the mounting pad 86 made of high-elasticity rubber through the first connecting block 85. As the sliding block 84 advances, the anti-slip patterns on the surface of the mounting pad 86 are closely attached to the inner wall of the ductile iron pipe, adapting to the difference in the inner diameter of the pipe through elastic deformation, achieving uniform force application and non-damaging expansion support.

[0034] The construction method of the ductile iron pipe rapid installation hydraulic trolley includes the following steps: S1. Clean the construction area to ensure that the ground flatness error ≤ 3 mm. Push the trolley to the pipeline axis direction through the four-corner universal wheels at the bottom of the mounting frame 1, and adjust the rollers 3 to be parallel to the pipeline laying path; S2. Manually pull the handle 62 according to the size of the ductile iron pipe. The handle 62 will drive the first telescopic rod 4 to stretch. Install the ductile iron pipe on the upper surface of the mounting frame 1 through a crane, and fix the ductile iron pipe by pulling the rope 93 to prevent it from falling off. Apply pressure to the foot pedal 53 to make the anti-slip plate 52 generate friction with the ground; S3. First, start the hydraulic cylinder 71. The hydraulic cylinder 71 will drive the first connecting column 72 to slide. While the first connecting column 72 slides, it will drive the expansion support assembly 8 to slide, and the second telescopic rod 73 will also stretch. Extend the expansion support assembly 8 into the ductile iron pipe. Then start the motor 81. The rotation of the motor 81 drives the second connecting column 82 to rotate. The rotation of the second connecting column 82 drives the gear disk 83 to rotate. Since the gear disk 83 is threadedly connected to the sliding block 84, it further drives the sliding block 84 to slide on the inner wall of the support shell 75, and at the same time drives the first connecting block 85 and the mounting pad 86 to slide until the mounting pad 86 contacts the inside of the ductile iron pipe; S4. When pipe docking is required, start the hydraulic cylinder 71 to drive the expansion and support assembly 8 to slide. Finally, the expansion and support assembly 8 will drive the ductile iron pipe to slide on the outer wall of the connecting rod 2, align with another ductile iron pipe, and make the sealing rubber ring of the socket and the docking pipe mouth fit perfectly. S5. After the docking is completed, turn off the motor 81. The gear disk 83 reversely drives the sliding block 84 to retract, and the mounting pad 86 disengages from the inner wall of the pipe. Contract the hydraulic cylinder 71 and the second telescopic rod 73 to reset the pushing assembly 7. Loosen the rope 93 of the fixing assembly 9, retract the anti-slip plate 52, and move the trolley to the next working station through the universal wheels.

[0035] Specifically, after the hydraulic trolley for rapid installation of ductile iron pipes is moved to the construction position through the four-corner universal wheels at the bottom of the installation frame 1, the operator steps on the foot pedal 53 of the anti-slip assembly 5 to make the anti-slip plate 52 contact the ground and fix the trolley by using the friction force. Manually adjust the first telescopic rod 4 of the support assembly 6 through the handle 62 and stretch it to adapt to the size of the ductile iron pipe. Then use a crane to place the pipe on the upper surface of the installation frame 1 and bind the pipe through the rope 93 of the fixing assembly 9 to prevent it from falling off.

[0036] Start the hydraulic cylinder 71 of the pushing assembly 7 to drive the first connecting column 72 to drive the expansion and support assembly 8 to move into the pipe. At the same time, the second telescopic rod 73 expands and contracts synchronously, so that the gear disk 83 in the support shell 75 rotates with the start of the motor 81. The gear disk 83 meshes with the sliding block 84 to drive the first connecting block 85 and the mounting pad 86 made of high-elastic rubber to slide along the inner wall of the support shell 75 until the mounting pad 86 fits tightly against the inner wall of the pipe to achieve expansion and fixation.

[0037] During pipe docking, the hydraulic cylinder 71 continues to push the expansion and support assembly 8 to make the ductile iron pipe slide along the roller 3 of the connecting rod 2, accurately align the socket of another pipe, and ensure that the sealing rubber ring fits perfectly. After the docking is completed, the motor 81 reversely drives the gear disk 83 to retract the sliding block 84, and the mounting pad 86 disengages from the inner wall of the pipe. Then contract the hydraulic cylinder 71 and the second telescopic rod 73 to reset the pushing assembly 7, loosen the rope 93 of the fixing assembly 9, retract the anti-slip plate 52, and move the trolley to the next working station through the universal wheels.

[0038] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Quick-installation hydraulic trolley for ductile iron pipes, including an installation frame (1), characterized in that, Inside the installation frame (1), there is a connecting rod (2) rotatably connected. On the outer wall of the connecting rod (2), there is a roller (3) fixedly connected. The outer wall of the connecting rod (2) is rotatably connected inside the installation frame (1). On the left outer wall of the installation frame (1), there is a first telescopic rod (4) fixedly connected. On the right outer wall of the first telescopic rod (4), there is an anti-slip component (5) fixedly connected. On the upper surface of the anti-slip component (5), there is a support component (6) fixedly connected. On the outer wall of the support component (6), there is a pushing component (7) fixedly connected. On the outer wall of the pushing component (7), there is an expanding component (8) fixedly connected. On both outer walls of the installation frame (1), there are fixing components (9) fixedly connected.

2. The hydraulic trolley for rapid installation of ductile iron pipes according to claim 1, wherein The anti-slip component (5) includes a connecting plate (51). The outer wall of the connecting plate (51) is fixedly connected to the right outer wall of the first telescopic rod (4). Inside the connecting plate (51), there is an anti-slip plate (52) rotatably connected. On the outer wall of the anti-slip plate (52), there is a footrest (53) fixedly connected.

3. The hydraulic trolley for rapid installation of ductile iron pipes according to claim 1, characterized in that, The fixing component (9) includes a second connecting block (91). The outer wall of the second connecting block (91) is fixedly connected to the outer wall of the installation frame (1). Inside the second connecting block (91), there is a fixing ring (92). On the outer wall of the fixing ring (92), there is a rope (93) fixedly connected.

4. The hydraulic trolley for rapid installation of ductile iron pipes according to claim 2, characterized in that, The support component (6) includes a support plate (61). The lower surface of the support plate (61) is fixedly connected to the upper surface of the connecting plate (51). On the left outer wall of the support plate (61), there is a handle (62) fixedly connected. On the right outer wall of the support plate (61), there is a fixing plate (63) fixedly connected.

5. The quick-installation hydraulic trolley for ductile iron pipes according to claim 4, characterized in that, The pushing component (7) includes a hydraulic cylinder (71). The outer wall of the hydraulic cylinder (71) is fixedly connected to the right outer wall of the support plate (61). The output end of the hydraulic cylinder (71) is connected to a first connecting column (72). On the outer wall of the fixing plate (63), there is a second telescopic rod (73) fixedly connected. On the right outer wall of the second telescopic rod (73), there is a fixing disk (74) fixedly connected. On the right outer wall of the fixing disk (74), there is a support shell (75) fixedly connected.

6. The hydraulic trolley for rapid installation of ductile iron pipes according to claim 5, characterized in that, The expanding component (8) includes a motor (81). The left outer wall of the motor (81) is fixedly connected to the right outer wall of the first connecting column (72). The output end of the motor (81) is connected to a second connecting column (82). On the right outer wall of the second connecting column (82), there is a toothed disk (83) fixedly connected. The tooth end of the toothed disk (83) is meshed with a sliding block (84). On the outer wall of the sliding block (84), there is a first connecting block (85) fixedly connected. On the outer wall of the first connecting block (85), there is a mounting pad (86) fixedly connected.

7. The quick-installation hydraulic trolley for ductile iron pipes according to claim 1, characterized in that, On the lower inner wall of the installation frame (1), there are universal wheels symmetrically distributed at the four corners of the bottom of the installation frame (1).

8. The ductile iron pipe rapid installation hydraulic trolley according to claim 6, characterized in that, The material of the mounting pad (86) is high-elastic rubber, and the surface is provided with anti-slip patterns.

9. The hydraulic trolley for rapid installation of ductile iron pipes according to claim 6, characterized in that, The outer wall of the toothed disk (83) is rotatably connected inside the support shell (75). The outer wall of the sliding block (84) is slidably connected to the inner wall of the support shell (75).

10. Construction method of a hydraulic trolley for rapid installation of ductile iron pipes, characterized in that, Applied to the ductile iron pipe rapid installation hydraulic trolley described in any one of claims 1-9, it includes the following steps: S1. Clean the construction area to ensure that the ground flatness error ≤ 3 mm. Push the trolley to the pipeline axis direction through the four-corner universal wheels at the bottom of the installation frame (1), and adjust the rollers (3) to be parallel to the pipeline laying path; S2. Manually pull the grip (62) according to the size of the ductile iron pipe. The grip (62) will drive the first telescopic rod (4) to stretch. Install the ductile iron pipe on the upper surface of the installation frame (1) through a crane, and fix the ductile iron pipe by pulling the rope (93) to prevent it from falling off. Apply pressure to the foot pedal (53) to make the anti-slip plate (52) generate friction with the ground; S3. First, start the hydraulic cylinder (71). The hydraulic cylinder (71) will drive the first connecting column (72) to slide. While the first connecting column (72) slides, it will drive the expansion and support assembly (8) to slide, and the second telescopic rod (73) will also expand and contract. Stretch the expansion and support assembly (8) into the interior of the ductile iron pipe, and then start the motor (81). The rotation of the motor (81) drives the second connecting column (82) to rotate. The rotation of the second connecting column (82) drives the gear disk (83) to rotate. Since the gear disk (83) is threadedly connected to the sliding block (84), it further drives the sliding block (84) to slide on the inner wall of the support shell (75), and at the same time drives the first connecting block (85) and the installation pad (86) to slide until the installation pad (86) contacts the interior of the ductile iron pipe; S4. When pipeline docking is required, start the hydraulic cylinder (71) again to drive the expansion and support assembly (8) to slide. Finally, the expansion and support assembly (8) will drive the ductile iron pipe to slide on the outer wall of the connecting rod (2) to align with another ductile iron pipe, so that the sealing rubber ring of the socket and the butt joint pipe orifice is completely fitted; S5. After docking is completed, turn off the motor (81). The reverse rotation of the gear disk (83) drives the sliding block (84) to retract, and the installation pad (86) disengages from the inner wall of the pipeline; Contract the hydraulic cylinder (71) and the second telescopic rod (73) to reset the pushing assembly (7), loosen the rope (93) of the fixing assembly (9), retract the anti-slip plate (52), and move the trolley to the next working position through the universal wheels.

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