Pipeline transfer system for pipe burying project under limited site condition

Abstract

The utility model discloses a pipeline transfer system for a pipe laying project under a limited site condition, which comprises a track and flat cars, two flat cars are adopted to transport a section of pipeline cooperatively, and the track is laid on a concrete cushion layer at the bottom of a foundation pit; the flat car comprises a flat car framework, a walking wheel system is installed on the flat car framework, the walking wheel system is connected with a walking wheel power system, track walking wheels of the walking wheel system are installed on the track in a supporting mode, a panel bracket is fixed to the top face of the flat car framework, and an arc-shaped supporting plate used for supporting a pipeline is fixed to the panel bracket. The pipeline transfer system can transfer pipelines at the same position in a foundation pit, fixing of pipeline lowering point positions is facilitated, possible influences on pipeline hoisting caused by adjacent buildings, high-voltage lines and the like in municipal engineering are avoided, safety is high, adaptability is high, and practicability is high. The cable is especially suitable for pipeline laying under unfavorable geological conditions such as sludge and backfill soil and space limited conditions such as adjacent high-voltage lines.

Description

Technical Field

[0001] This utility model relates to the technical field of auxiliary devices for municipal pipeline installation and construction, specifically a pipeline transfer system for buried pipe projects under site-constrained conditions. Background Technology

[0002] Buried pipe engineering in municipal projects is an important component of urban infrastructure construction, involving the laying of pipelines for water supply, sewage, gas, electricity, and oil. Against the backdrop of rapid urbanization, buried pipe projects often face challenges such as complex geological conditions, dense underground pipeline distribution, and limited construction sites, especially in scenarios with complex geological conditions such as coastal factory construction and renovation of old residential areas. These scenarios are particularly notable for problems such as limited construction sites and soft geological conditions (e.g., silt, backfill, and tidal influences affecting soil strength), making traditional pipeline installation methods inefficient and even posing safety hazards.

[0003] In traditional pipeline installation projects, temporary support systems are often used for laying municipal pipelines. Specifically, steel sheet piles are first driven into the ground, and then the foundation pit is excavated to the bottom of the waler. After the waler and cross bracing are installed and reinforced, the excavation continues to the bottom of the foundation pit. During the pipeline hoisting and lowering process, the cross bracing needs to be temporarily removed to complete the hoisting and subsequent procedures. This method has a simple construction process, fast installation speed, and strong applicability, and is widely used in various municipal pipeline installation projects under conditions where the site is not restricted.

[0004] However, such methods have significant drawbacks in soft soil strata. Due to the low shear strength and poor self-stability of the soil in soft strata, the temporary removal of the cross bracing directly leads to abrupt changes in the stress state of the foundation pit retaining system, inducing stress redistribution between the retaining structure and the soil. The soil experiences disturbance and displacement due to unloading rebound and weakened lateral restraint, which in turn causes pit wall deformation, surrounding surface settlement, and in severe cases, even secondary disasters such as cracking of existing municipal roads, instability of adjacent building foundations, and wall cracking. Furthermore, due to site constraints, cranes cannot sequentially lower pipes along with the foundation pit. These problems severely restrict the efficient implementation of underground pipe laying projects in confined sites with soft soil strata, urgently requiring breakthroughs through technological innovation. Summary of the Invention

[0005] The purpose of this utility model is to address the problems existing in the prior art by providing a pipeline transfer system for buried pipe projects under site-constrained conditions. This pipeline transfer system can transfer pipelines at the same location in the foundation pit, which is conducive to fixing the pipeline lowering point and avoiding the impact of nearby buildings, high-voltage lines, etc. on pipeline hoisting in municipal engineering. It has high safety and strong adaptability, and is especially suitable for pipeline laying under adverse geological conditions such as silt and backfill soil, as well as under space-constrained conditions such as proximity to high-voltage lines.

[0006] This utility model is achieved using the following technical solution:

[0007] A pipeline transfer system for buried pipe projects under site-constrained conditions includes a track and a flatcar. Two flatcars work together to transport one section of pipeline. The track is laid on a concrete cushion layer at the bottom of the excavation pit. The flatcar includes a frame with a wheel system connected to it. A power system for the wheel system is also connected to the wheel system. The wheel system's track and wheel supports are mounted on the track. A panel bracket is fixed to the top surface of the flatcar frame, and an arc-shaped support plate for supporting the pipeline is fixed on the panel bracket. The wheel system and power system are commercially available and purchased for installation. During construction, the concrete cushion layer at the bottom of the excavation pit must first be constructed at the pipeline's fixed lowering point. Then, the track installation line is laid out at the bottom of the pit according to the wheel spacing, and the track is laid and installed. The tracks are connected using clamps. After the track is laid, the flatcar is lowered. After the power system is connected to power, wiring, and debugging, the pipeline is hoisted and lowered.

[0008] A further preferred embodiment: The flatcar frame includes two longitudinal beams arranged in parallel and symmetrical arrangement, connected by a horizontal brace and scissor braces; each longitudinal beam includes two channel steel frames arranged in parallel and symmetrical arrangement, fixedly connected by stiffening ribs; the track wheels of the traveling wheel system are respectively installed at both ends between the two channel steel frames, and bolt holes are provided on the channel steel frames for bolting to the panel bracket. The track uses a Q235B 38kg / m standard track, which is lengthened as the flatcar travels a distance at the bottom of the pit, with the track spacing consistent with the distance between the track wheels on both sides.

[0009] A further preferred embodiment: end plates are welded to both ends of the two channel steel frames, and stiffening steel plates are welded to the web of the two channel steel frames.

[0010] A further preferred embodiment: the scissor brace is bolted to the longitudinal beam of the flatcar via a connecting ear plate, the connecting ear plate is welded to the longitudinal beam of the flatcar, and the connecting ear plate is connected to the scissor brace via bolts.

[0011] A further preferred embodiment: the panel bracket includes a bracket frame welded together by two longitudinal beams and two transverse beams, with longitudinal connecting rods and transverse connecting rods welded inside the bracket frame, and bolt connection holes correspondingly provided in the bracket frame; a panel is welded to the top of the bracket frame, and multiple arc-shaped support plates are welded to the panel at intervals, with the multiple arc-shaped support plates arranged along the length of the track, and side plates are welded between the two ends of the multiple arc-shaped support plates, the side plates connecting the multiple arc-shaped support plates into one unit.

[0012] A further preferred embodiment: the arc-shaped support plate is padded with a rubber pad to prevent scratching the pipe.

[0013] The pipeline transfer system for buried pipe projects under site constraints can be constructed using welded steel sections and standard components to form a flatbed frame and a panel frame. These two parts are then bolted together with high-strength bolts, resulting in a simple structure and convenient installation. It allows for pipeline transfer from the same location within the excavation pit, facilitating the fixing of pipeline lowering points and avoiding potential impacts from nearby buildings or high-voltage lines on pipeline hoisting, as is common in municipal engineering projects. It offers high safety and strong adaptability, making it particularly suitable for pipeline laying in adverse geological conditions such as silt and backfill soil, as well as in space-constrained conditions such as proximity to high-voltage lines. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the pipeline transfer system.

[0015] Figure 2 for Figure 1 A left-view diagram;

[0016] Figure 3 This is a structural diagram of a flatcar;

[0017] Figure 4 This is a structural diagram of the flatcar frame;

[0018] Figure 5 This is a structural schematic diagram of the panel bracket;

[0019] Figure 6 Plan view of the pipeline lowering points in the soft soil reinforcement section;

[0020] Figure 7 This is a schematic diagram of the connection structure between the anchor cable and the waler;

[0021] Figure 8 A schematic diagram of the pipeline installation and transportation sequence;

[0022] The component names corresponding to the serial numbers in the diagram are:

[0023] 1. Walking wheel system; 2. Flatcar frame; 3. Walking wheel power system; 4. Panel bracket; 5. Side plate; 6. Panel; 7. Curved support plate; 8. Channel steel frame; 9. Stiffening steel plate; 10. Bolt connection hole; 11. Stiffening rib; 12. Track walking wheel; 13. End plate; 14. Flatcar cross brace; 15. Scissor brace; 16. Connecting ear plate; 17. Longitudinal beam; 18. Cross beam; 19. Longitudinal connecting rod; 20. Transverse connecting rod; 21. Concrete pad; 22. Track; 23. Rubber pad; 24. Pipe; 25. Flatcar; 26. Cross brace; 27. Crane; 28. Waler; 29. ​​Anchor cable; 30. Steel sheet pile; 31. I-beam bracket. Detailed Implementation

[0024] The technical solutions of the invention will be clearly and completely described below with reference to the embodiments. The described embodiments are only a part of the present utility model, and not all of the embodiments. Example

[0025] A pipeline transport system for buried pipe engineering under site constraints includes a track 22 and a flatcar 25. Two flatcars 25 work together to transport one section of pipe 24. The track 22 is laid on a concrete cushion layer 21 at the bottom of the excavation pit. The flatcar 25 includes a flatcar frame 2, on which a wheel system 1 is installed. The wheel system 1 is connected to a wheel drive system 3. The wheel wheels 12 of the wheel system 1 are supported on the track 22. A panel bracket 4 is fixed to the top surface of the flatcar frame 2, and an arc-shaped support plate 7 for supporting the pipe 24 is fixed on the panel bracket 4. The wheel system 1 and wheel drive system 3 are commercially available wheel systems and drive systems, purchased and installed commercially. During construction, the concrete cushion layer at the bottom of the excavation pit must first be constructed at the pipe fixing and lowering point. Then, the track installation line is laid out at the bottom of the excavation pit according to the wheel spacing, and the track is laid and installed. The tracks are connected by clamps. After the track is laid, the flatcar is lowered. Once the power system is connected to the power supply and the wiring is debugged, the pipeline will be hoisted and lowered.

[0026] The flatcar frame 2 includes two longitudinal beams arranged in parallel and symmetrically, connected by a flatcar cross brace 14 and a scissor brace 15. Each longitudinal beam includes two channel steel frames 8, also arranged in parallel and symmetrically, fixedly connected by stiffening ribs 11. Track wheels 12 of the traveling wheel system 1 are installed at both ends between the two channel steel frames 8. Bolt connection holes 10 are provided on the channel steel frames 8 for bolting to the panel bracket 4. The track 22 is a standard Q235B 38kg / m track, which is lengthened as the flatcar travels a distance at the bottom of the pit, with the track spacing matching the distance between the track wheels 12 on both sides.

[0027] The two ends of the two channel steel frames 8 are respectively welded with end plates 13, and the webs of the two channel steel frames 8 are respectively welded with stiffening steel plates 9.

[0028] The scissor brace 15 is bolted to the flatcar longitudinal beam via a connecting ear plate 16, the connecting ear plate 16 is welded to the flatcar longitudinal beam, and the connecting ear plate 16 is connected to the scissor brace 15 via bolts.

[0029] The panel bracket 4 includes a bracket frame welded together from two longitudinal beams 17 and two transverse beams 18. Longitudinal connecting rods 19 and transverse connecting rods 20 are welded inside the bracket frame, and bolt connection holes 10 are correspondingly provided on the bracket frame. A panel 6 is welded to the top of the bracket frame, and multiple arc-shaped support plates 7 are welded to the panel 6 at intervals. The multiple arc-shaped support plates 7 are arranged along the length of the track 22, and side plates 5 are welded between the two ends of the multiple arc-shaped support plates 7, connecting the multiple arc-shaped support plates 7 into a single unit. Rubber pads 23 are provided on the arc-shaped support plates 7 to prevent scratching the pipe 24.

[0030] The construction of buried pipe projects under site-constrained conditions includes the following steps:

[0031] A. Site leveling is required for the pipeline placement point in soft geological conditions. The selection of the pipeline placement location in soft geological conditions has the following two reference conditions: First, the site must meet the requirements for pipeline transportation and storage; second, there should be no high-voltage lines, land boundary lines, or other factors that may affect the crane's positioning, boom extension, and hoisting.

[0032] A drainage ditch is constructed at the top of the excavation pit. Sheet pile positioning piles are installed every 6 meters, and steel guide beams are installed on both sides of the pit's edge. Sheet piles 30 are driven using a screen-type driving method, with the top elevation of the piles 0.5 meters above the top of the pit. After the sheet piles 30 are driven, the pit is excavated. One location is selected as the fixed point for the pipeline lowering. No cross bracing 26 is installed at this location; instead, anchor cables 29 are used to reinforce the walers 28. The remaining locations are reinforced with... A horizontal brace 26 is installed on the purlin 28. Anchor cables 29 and the purlin 28 are installed 0.5-1m below the bottom of the purlin 28. The anchor cables 29 are driven to penetrate the sliding failure surface of the foundation pit and are set at a certain angle. After installation, grouting and tensioning are performed. The other side is anchored to the I-beam bracket 31 of the purlin 28 through anchorage. The purlin 28 adopts a double-section steel form. Bracket supports are welded on the steel sheet piles 30 as vertical supports for the purlin 28.

[0033] B. Install a pipeline transfer system for transferring pipelines within the foundation pit. The fabrication and installation of the pipeline transfer system can be completed in the factory. When transporting the pipeline to the designated lowering point, it will be lowered using a crane.

[0034] C. Hoist the pipeline onto the pipeline transfer system, which will then transport the pipeline to the designated location. Nylon slings that will not damage the pipeline's anti-corrosion paint must be used. The hoisting process should follow trial hoisting steps, including no-load and full-load trial hoisting. Formal hoisting will only proceed after successful trial hoisting. A two-point lifting method will be used, with the lifting points 0.2 times the pipe length from both ends of the object. Two cranes (27) will be used to lower the pipeline from the ground onto the flatcars of the pipeline transfer system at the bottom of the pit. One flatcar will be placed at each of the two lifting points. The pipeline will be transported along the tracks using the flatcars at both ends. Mark the contact points between the pipeline and the curved support with a marker. Adjust the flatcar speed as the marked positions change to ensure synchronization during transport. As the flatcar travels further, a cable reel and support should be installed on the panel to prevent the power cord from interfering with the flatcar's movement and to prevent potential electric shock hazards from friction damage caused by the power cord dragging on the ground.

[0035] D. After transporting the pipeline to the designated location, the pipeline will be installed. The pipeline transfer and installation shall follow the order from farthest to near. First, install the pipeline at the farthest point from the fixed point where the pipeline was laid, and then install it section by section back.

[0036] The anchor cable 29 must penetrate the potential sliding failure surface, with the anchoring section extending ≥4m into the stable soil layer and the free section ≥5m in length, avoiding the active earth pressure zone. The horizontal spacing is 1.5-3.0m, and the vertical spacing is 2.0-3.0m to avoid mutual interference between the anchor cables 29. Tensioning must be done in stages: 0→25%→50%→75%→100% of the design load. If the prestress loss exceeds 10% within 48 hours after locking, additional tensioning is required.

[0037] The construction of buried pipe projects under site constraints mainly involves selecting fixed pipe placement points. At the fixed pipe placement point, no cross bracing 26 is installed on the waler 28; instead, anchor cables 29 are used to reinforce the waler 28. Cross bracing 26 is installed on the waler 28 at other locations. A concrete pad 21 is laid at the bottom of the pit for leveling. A track 22 is laid on the concrete pad 21, and a flatcar 25 is installed on the track 22. At the fixed pipe placement point, a crane 27 is used to lift the pipe 24 onto the flatcar 25. The pipe 24 is then transported and installed using the flatcar 25. The transport and installation follow a sequence from farthest to near, first installing the pipe furthest from the fixed pipe placement point, and then installing it section by section backwards. During construction, there is no need to temporarily remove the cross braces, which effectively solves the problem of soil instability that may be caused by the removal of temporary supports in soft soil strata buried pipe projects. At the same time, the fixed pipe lowering point avoids the impact that nearby buildings, high-voltage lines, etc. may have on pipe hoisting in municipal engineering projects. It has high safety and strong adaptability, and is especially suitable for pipe laying in adverse geological conditions such as silt and backfill soil, as well as in space-constrained conditions such as proximity to high-voltage lines.

[0038] The above description is not intended to limit the present utility model, nor is the present utility model limited to the above examples. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should be protected by the present utility model.

Claims

1. A pipeline transfer system for buried pipe projects under site-constrained conditions, characterized in that: The system includes a track (22) and a flatcar (25). The track (22) is laid on a concrete cushion layer (21) at the bottom of the pit. The flatcar (25) includes a flatcar frame (2), a walking wheel system (1) is installed on the flatcar frame (2), a walking wheel power system (3) is connected to the walking wheel system (1), and the track walking wheels (12) of the walking wheel system (1) are supported and installed on the track (22). A panel bracket (4) is fixed on the top surface of the flatcar frame (2), and an arc-shaped support plate (7) for supporting the pipe (24) is fixed on the panel bracket (4).

2. The pipeline transfer system for buried pipe projects under site-constrained conditions as described in claim 1, characterized in that: The flatcar frame (2) includes two flatcar longitudinal beams, which are arranged in parallel and symmetrically. The two flatcar longitudinal beams are connected by a flatcar cross brace (14) and a scissor brace (15). The flatcar longitudinal beam includes two channel steel frames (8), which are arranged in parallel and symmetrically. The two channel steel frames (8) are fixedly connected by stiffening ribs (11). The track wheels (12) of the walking wheel system (1) are respectively installed at both ends between the two channel steel frames (8). The channel steel frames (8) are provided with bolt connection holes (10) for bolting to the panel bracket (4).

3. The pipeline transfer system for buried pipe projects under site-constrained conditions as described in claim 2, characterized in that: The two ends of the two channel steel frames (8) are respectively welded with end plates (13), and the webs of the two channel steel frames (8) are respectively welded with stiffening steel plates (9).

4. The pipeline transfer system for buried pipe projects under site-constrained conditions as described in claim 2, characterized in that: The scissor brace (15) is bolted to the longitudinal beam of the flatcar via a connecting ear plate (16), the connecting ear plate (16) is welded to the longitudinal beam of the flatcar, and the connecting ear plate (16) and the scissor brace (15) are connected by bolts.

5. The pipeline transfer system for buried pipe projects under site-constrained conditions according to claim 1 or 2, characterized in that: The panel bracket (4) includes a bracket frame welded together by two longitudinal beams (17) and two transverse beams (18). The bracket frame is welded with longitudinal connecting rods (19) and transverse connecting rods (20). The bracket frame is provided with bolt connection holes (10). A panel (6) is welded to the top of the bracket frame. Multiple arc-shaped support plates (7) are welded to the panel (6) at intervals. The multiple arc-shaped support plates (7) are arranged along the length of the track (22). Side plates (5) are welded between the two ends of the multiple arc-shaped support plates (7). The side plates (5) connect the multiple arc-shaped support plates (7) into one unit.

6. The pipeline transfer system for buried pipe projects under site-constrained conditions according to claim 1 or 2, characterized in that: The arc-shaped support plate (7) is provided with a rubber pad (23) to prevent scratching the pipe (24).

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