Simple moving device for jacking large-diameter nodular cast iron pipe

Abstract

The application relates to the technical field of pipeline construction equipment, and discloses a simple and easy moving device for jacking of a large-diameter nodular cast iron pipe, which comprises two groups of symmetrical device units, can be sleeved on the outer side of the large-diameter nodular cast iron pipe after being assembled through connecting assemblies, and realizes the fixing, suspension and moving guidance of the cast iron pipe. Each group of device units is composed of a hoop assembly, a moving assembly and a connecting assembly, the hoop assembly is used for adapting to the outer wall of the large-diameter nodular cast iron pipe and realizing fixing, the connecting assembly is a structure at the two ends of the fixed hoop body, the connecting plate is integrally bent and formed with the hoop assembly, at least two positioning holes are arranged on the connecting plate in the length direction and are spaced apart, the spacing of the positioning holes is designed according to the circumference difference of cast iron pipes with different diameters, and the connecting assembly is convenient for adapting to the assembly requirements of pipes with various diameters.

Description

Technical Field

[0001] This application relates to the field of pipeline construction equipment technology, and in particular to a simple moving device for jacking large-diameter ductile iron pipes. Background Technology

[0002] In underground pipeline construction, large-diameter ductile iron pipes (usually referring to nominal diameter DN≥1000mm) are widely used in urban water supply and drainage projects due to their high strength and corrosion resistance. These cast iron pipes are mostly constructed using trenchless jacking technology, which involves using jacking equipment to push the cast iron pipe along a predetermined axis into the underground casing or soil layer.

[0003] Currently, the industry mainly reduces friction between the casing and the cast iron pipe (working pipe) by applying lubricant. However, this method has obvious drawbacks: First, different jacking lengths lead to significant differences in lubricant requirements, making it difficult to accurately control the amount used in actual construction. Insufficient lubricant will not effectively reduce resistance, while excessive lubricant will result in waste and pollution of the construction environment. Second, large-diameter ductile iron pipes can reach 6-9m in length and weigh 5-10 tons, experiencing extremely high resistance during jacking. Lubricant alone cannot completely offset the frictional resistance, easily causing scratches and local deformation on the surface of the cast iron pipe, making it difficult to achieve the construction requirement of "non-destructive jacking".

[0004] To address these issues, steel roller supports have been attempted as auxiliary devices in some construction scenarios. However, existing supports are complex in structure, large in size, and heavy in weight, requiring the use of large equipment such as cranes for installation, resulting in poor construction flexibility. Furthermore, the small contact area between the support and the cast iron pipe makes it easy for uneven force to cause localized deformation of the pipe during jacking. Additionally, the support cannot enter the casing synchronously with the cast iron pipe, requiring disassembly and reinstallation after jacking to a certain length, which seriously affects construction efficiency. Utility Model Content

[0005] To address the aforementioned problems, this application provides a simple moving device for jacking in large-diameter ductile iron pipes.

[0006] The present application provides a simple moving device for jacking large-diameter ductile iron pipes, which adopts the following technical solution: A simple moving device for jacking large-diameter ductile iron pipes includes at least two symmetrically arranged device units. Each device unit includes: a clamp assembly for fitting and fixing to the outer wall of the large-diameter ductile iron pipe, the clamp assembly having connecting plates with positioning holes at both ends; a moving component fixed to the outside of the clamp assembly, the moving component being used to reduce the friction between the device unit and the contact surface of the construction environment, thereby driving the large-diameter ductile iron pipe to move along the jacking direction; and a connecting component passing through the positioning holes of the two device units, enabling a detachable connection between the two device units, and allowing the large-diameter ductile iron pipe to be detached from the construction ground and kept suspended after connection.

[0007] Preferably, the clamp assembly includes: an arc-shaped clamp body adapted to the outer wall of a large-diameter ductile iron pipe, and a plate-shaped connecting plate fixed to both ends of the clamp body, wherein at least two positioning holes are spaced apart along the long axis of the connecting plate.

[0008] Preferably, the moving component includes: a mounting bracket with one end fixedly connected to the clamp assembly; a rolling element located inside the mounting bracket and rotatably connected to the mounting bracket; and a reinforcing rib connected between the mounting bracket and the clamp assembly to increase the connection strength. The rolling direction of the rolling element is consistent with the jacking direction of the large-diameter ductile iron pipe.

[0009] Preferably, it further includes a load-bearing stabilizer, which is fixed to the outside of the clamp assembly and located next to the moving assembly, and the load-bearing stabilizer is welded to the clamp assembly.

[0010] Preferably, the load-bearing stabilizer includes: a fixed frame and a movable stabilizing bracket, the fixed frame being connected to the clamp assembly, and the stabilizing bracket being foldable or unfoldable relative to the fixed frame, providing additional support to the clamp assembly when unfolded.

[0011] Preferably, the bottom of the load-bearing stabilizer is provided with a detachable conical head, which is used to increase the grip of the clamp assembly.

[0012] In summary, this application includes the following beneficial technical effects: By completely suspending the cast iron pipe with the moving component, the friction between the cast iron pipe and the casing and the ground is changed from "sliding friction" to "rolling friction". The friction coefficient is reduced from 0.3-0.5 to 0.05-0.1, and the jacking resistance is significantly reduced. At the same time, the clamp component fits tightly with the cast iron pipe and the force is evenly distributed, avoiding excessive local pressure that could cause pipe deformation. This truly achieves non-destructive jacking of large-diameter ductile iron pipes.

[0013] All components of the device are welded or detachable. After the jacking construction is completed, the device can be removed from the cast iron pipe by loosening the connecting components. After simple cleaning (removing surface dirt and adding grease), it can be reused for subsequent projects, further reducing the cost of a single construction. Attached Figure Description

[0014] Figure 1 This is a perspective view of a simple moving device for jacking large-diameter ductile iron pipes according to this utility model.

[0015] Figure 2 This is a schematic diagram of the structure of Embodiment 1 of this utility model.

[0016] Figure 3 This is a schematic diagram of the structure of Embodiment 2 of this utility model.

[0017] Figure 4 This is a diagram showing the usage state of the load-bearing and stabilizing component of this utility model.

[0018] Explanation of reference numerals in the attached drawings: 1. Clamp assembly; 2. Moving assembly; 3. Connecting assembly; 4. Load-bearing and stabilizing component; 11. Clamp body; 12. Connecting plate; 13. Positioning hole; 21. Mounting bracket; 22. Reinforcing rib; 23. Rolling component; 41. Fixing bracket; 42. Stabilizing bracket; 43. Conical head. Detailed Implementation

[0019] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0020] Example 1 A simple moving device for jacking large-diameter ductile iron pipes, such as... Figures 1 to 2 As shown, it includes two sets of symmetrical device units. After the two sets of device units are assembled by connecting components, they can be fitted onto the outside of a large-diameter ductile iron pipe to achieve the fixing, suspension and movement guidance of the cast iron pipe. The two sets of device units are 180° apart, and each set covers 1 / 2 of the pipe's circumference. Since one set cannot achieve uniform force distribution around the pipe, it is easy to cause the pipe to be eccentric; the two sets can form symmetrical support to ensure suspension stability.

[0021] Each unit consists of a clamp assembly 1, a moving assembly 2, and a connecting assembly 3. The clamp assembly 1 is used to fit and fix the outer wall of the large-diameter ductile iron pipe. The connecting assembly 3 is used to fix the two ends of the clamp body 11. The connecting plate 12 is integrally bent and formed with the clamp assembly 1. At least two positioning holes 13 are provided on the connecting plate 12 along the length direction. The spacing of the positioning holes 13 is designed according to the circumference difference of different diameter cast iron pipes, so as to facilitate the assembly requirements of various pipe diameters through the connecting assembly. The moving assembly 2 is fixed to the outside of the clamp assembly 1 to reduce the friction between the device and the construction environment, and drive the cast iron pipe to move smoothly along the jacking direction.

[0022] The clamp assembly 1 includes: an arc-shaped clamp body 11 adapted to the outer wall of the cast iron pipe. The clamp body 11 is made of 0.5cm thick Q235B carbon structural steel. The arc radius is determined according to the nominal diameter of the cast iron pipe to be jacked in (the arc radius of the clamp body 11 adapted to DN1500 cast iron pipe is about 750mm), ensuring a tight fit with the outer wall of the cast iron pipe. The moving component 2 includes a mounting frame 21, reinforcing ribs 22, and rolling elements 23. The mounting frame 21 is made of angle steel and welded together. One end is welded and fixed to the outside of the clamp body 11 of the clamp assembly 1, and the other end extends away from the cast iron pipe to form a frame structure for mounting the rolling elements 23. The rolling elements 23 are rotatably mounted inside the mounting frame 21. They are preferably directional wheels or moving cams with anti-slip textures (diameter 150-180mm, width 50-100mm). Double deep groove ball bearings (filled with extreme pressure lithium-based grease to improve wear resistance) are installed in the wheel core. The rolling direction is consistent with the jacking direction of the cast iron pipe to ensure stable movement trajectory. The rolling elements 23 are located in the middle position where the clamp assembly 1 contacts the ground.

[0023] The reinforcing rib 22 is made of angle steel and is distributed in a "triangle" shape between the mounting frame 21 and the hoop 11. Both ends are welded and fixed to the mounting frame 21 and the hoop 11 respectively. The stability of the triangular structure enhances the connection strength between the mounting frame 21 and the clamp assembly 1, and avoids deformation of the mounting frame 21 due to excessive force during jacking.

[0024] The connecting assembly is used to achieve a detachable connection between two sets of symmetrical device units. M20 grade high-strength bolts are preferred, used in conjunction with nuts. During assembly, the connecting plates 12 of the two sets of device units are aligned, making the positioning holes 13 coaxial. Then, the high-strength bolts are inserted into the positioning holes 13 and the nuts are tightened until the clamps 11 of the two sets of device units completely grip the cast iron pipe. The cast iron pipe is then lifted off the construction surface by the moving assembly 2, achieving complete suspension (the suspension height is typically 50–100 mm to avoid friction between the cast iron pipe and the ground).

[0025] In actual use, a crane is used to hoist the DN1600 cast iron pipe onto the guide rail at the starting point of the jacking process. The pipe body is adjusted to ensure that the jacking axis is consistent with the casing axis. The two sets of device units are then inserted from both ends of the cast iron pipe, so that the clamp 11 fits against the outer wall of the pipe body and the connecting plate 12 is aligned. The high-strength bolts are inserted into the positioning holes 13, and the nuts are tightened symmetrically (torque controlled at 300-350 N·m) until the cast iron pipe is completely suspended (suspended height 80 mm). The jacking equipment (two 500-ton jacks) is connected to the rear end of the cast iron pipe, and the equipment is started to push the cast iron pipe. The directional wheel of the moving component 2 rolls along the inner wall of the casing, driving the cast iron pipe to smoothly enter the casing. The jacking speed is controlled at 1.5 m / h. After the jacking of a single cast iron pipe is completed, the high-strength bolts are loosened, the two sets of device units are disassembled from the cast iron pipe, and the above steps are repeated for the next cast iron pipe.

[0026] Example 2 Based on Example 1, in order to further improve the stability of the device in complex construction environments (such as soft mud) and avoid tipping or tilting during jacking, a load-bearing stabilizing component 4 can be added to the outside of the clamp assembly 1. It is located next to the moving component 2 and is welded and fixed to the clamp body 11 of the clamp assembly 1.

[0027] like Figure 3 and Figure 4 As shown, it specifically includes: a fixed frame 41, a stabilizing bracket 42, and a conical head 43; the fixed frame 41 is made of welded steel plate and serves as the basic support structure for bearing the stabilizing component 4. One end is welded to the outside of the hoop 11, and the other end extends to both sides perpendicular to the jacking direction; the stabilizing bracket 42 is a movable rod-shaped structure (made of high-strength round steel) connected to the fixed frame via hinges, and can be folded or unfolded relative to the fixed frame: when the device is in the transportation or assembly stage, the stabilizing bracket 42 is folded and attached to the outside of the hoop 11 to save space; when the device arrives at the installation position and is assembled, it will stabilize the device. The support 42 is extended to a position perpendicular to the ground, with its bottom contacting the construction surface, forming an additional support point besides the moving component 2, distributing the weight of the pipe and preventing the device from tilting. The conical head 43 is detachably installed at the bottom of the stabilizing support 42 and is rotatably connected to the stabilizing support 42 via threads. It is made of wear-resistant cast iron and has a conical head. When the construction ground is soft mud, the conical head 43 can be inserted into the soil to enhance the grip of the stabilizing support 42 and further improve the support stability. When the ground is hard, the conical head 43 can be removed, and the ground can be directly contacted through the flat surface at the bottom of the stabilizing support 42.

[0028] The actual usage method of this embodiment differs from that of Implementation 1 in that, during device assembly, load-bearing stabilizing components 4 (two sets on each side, symmetrically distributed) are welded to the outside of the hoop 11 of the two sets of device units; after the cast iron pipe is suspended, the stabilizing bracket 42 is unfolded to a vertical position, so that the conical head 43 is inserted into the silt (insertion depth of about 50mm), forming a composite support structure of "moving component 2 + stabilizing bracket 42"; during the jacking process, if a thick silt area is encountered, the conical head 43 of the stabilizing bracket 42 can be used to enhance the grip and prevent the device from tilting to the side; when jacking to a hard section, the conical head 43 is unscrewed, and the bottom plane of the stabilizing bracket 42 directly contacts the ground.

[0029] After the stabilizing bracket 42 is deployed, it contacts the ground, distributing the weight of the tube body to the ground, reducing the single-point force on the moving component, and preventing tilting due to the shift of the tube's center of gravity. The conical head 43 can be inserted into the soft soil layer, increasing the contact area and friction, and preventing the stabilizing bracket 42 from slipping.

[0030] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change. Secondly: The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other. Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

[0031] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A simple moving device for jacking large-diameter ductile iron pipes, characterized in that, It includes at least two sets of symmetrically arranged device units, each set of device units including: The clamp assembly is used to fit and fix the outer wall of a large-diameter ductile iron pipe, and its two ends are provided with connecting plates with positioning holes. A movable component is fixed to the outside of the clamp assembly; the movable component is used to reduce the friction between the device unit and the contact surface of the construction environment, so as to drive the large-diameter ductile iron pipe to move along the jacking direction. The connecting component is inserted into the positioning holes of the two sets of device units to realize the detachable connection of the two sets of device units, and after connection, the large-diameter ductile iron pipe can be lifted off the construction ground and kept in a suspended state.

2. The simple moving device for jacking large-diameter ductile iron pipes according to claim 1, characterized in that, The clamp assembly includes: The hoop has an arc-shaped structure that fits the outer wall of the large-diameter ductile iron pipe; The connecting plate is a plate-shaped structure fixed to both ends of the hoop. At least two positioning holes are spaced apart along the long axis of the connecting plate.

3. The simple moving device for jacking large-diameter ductile iron pipes according to claim 1, characterized in that, The moving component includes: The mounting bracket is fixedly connected at one end to the clamp assembly; A rolling element is located inside the mounting bracket and is rotatably connected to the mounting bracket. A reinforcing rib is connected between the mounting bracket and the clamp assembly to increase the connection strength; The rolling direction of the rolling element is consistent with the jacking direction of the large-diameter ductile iron pipe.

4. The simple moving device for jacking large-diameter ductile iron pipes according to claim 1, characterized in that, It also includes a load-bearing stabilizer, which is welded and fixed to the outside of the clamp assembly and located next to the moving assembly.

5. The simple moving device for jacking large-diameter ductile iron pipes according to claim 4, characterized in that, The load-bearing stabilizer includes a fixed frame and a movable stabilizing bracket. The fixed frame is connected to the clamp assembly, and the stabilizing bracket can be folded or unfolded relative to the fixed frame. When unfolded, it provides additional support to the clamp assembly.

6. The simple moving device for jacking large-diameter ductile iron pipes according to claim 4, characterized in that, The bottom of the load-bearing stabilizer is provided with a detachable conical head, which is used to increase the grip of the clamp assembly.

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