Pipe jacking construction method for water taking pipeline
By setting up a cofferdam at the water intake and using mixing piles for reinforcement, combined with mud injection and pull-out pile support, the stability problem of the water intake in pipe jacking construction was solved, and efficient and stable jacking without diving was achieved.
Patent Information
- Application Number
- CN202511385055.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-26
- Publication Date
- 2025-11-18
AI Technical Summary
In pipe jacking construction, after the jacking machine head reaches the water intake point, it needs to be manually lifted out by underwater personnel, which is difficult to carry out. In addition, the soil at the water intake point is prone to erosion, which can lead to the settlement of the water intake pipe.
A cofferdam is set up at the water intake point, and the water intake point is reinforced within a certain range using mixing piles. The friction between the outer wall of the pipe and the soil is reduced by slurry injection. During construction, anti-uplift piles and guide rails are used to support the pipeline and ensure its stability.
The elimination of the need for diving during construction reduces the difficulty of construction and improves the stability and efficiency of the water intake pipe.
Smart Images
Figure CN120969579A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the technical field of pipe jacking construction, and specifically relates to a method for pipe jacking construction of water intake pipelines. Background Technology
[0002] Pipe jacking construction involves using jacking equipment within a working pit to overcome the friction between the pipe and the surrounding soil, pushing the pipe into the ground at a designed slope, and then removing the excavated soil. The principle is based on the thrust generated by the main jacking cylinder and the pipe sections and intermediate sections, which propels the tool pipe or jacking head through the soil layer from the working shaft to the predetermined position and lift it out. After the jacking head is lifted out, its joint naturally embeds itself between the two pits. When using pipe jacking to construct water intake pipes, after the jacking head reaches the water intake point, it needs to be manually lifted out by diving, making the construction more difficult. Furthermore, the soil at the water intake point is prone to erosion, which can easily lead to settlement of the water intake pipe.
[0003] Therefore, there is a need to provide an improved technical solution that addresses the shortcomings of the existing technology. Summary of the Invention
[0004] The purpose of this invention is to overcome the shortcomings of the prior art. This invention provides a method for constructing a water intake pipeline by pipe jacking.
[0005] To achieve the above objectives, the present invention provides the following technical solution: A method for constructing a water intake pipeline by pipe jacking includes: Step S1: Construct the jacking guide seat at the bottom of the working shaft and install a steel backrest on the side of the working shaft away from the jacking direction. Step S2: After hoisting the main jacking equipment to the top of the jacking guide seat, make adjustments. After hoisting the machine head into place, allow the machine head to enter the hole. Install the hole-sealing ring between the machine head and the hole opening. Step S3: The main jacking equipment retracts, and the pipe section is hoisted between the machine head and the main jacking equipment. The pipe section is welded to the existing pipe section, and the joint is treated with anti-corrosion. Then, the main jacking equipment is started to advance the pipe section. Step S4: As the main jacking equipment extends and retracts, multiple pipe sections are jacked in sequence. When the jacking head reaches the preset position, the intermediate room is hoisted, and then the pipe sections are hoisted down for continuous jacking. Step S5: When the machine head reaches the preset mileage, a cofferdam is constructed around the water intake simultaneously. Mixing piles are constructed inside the cofferdam, and the mixing piles interlock to reinforce the area inside the cofferdam. At least two rows of pipe piles are installed on the slope inside the cofferdam corresponding to the water intake outlet direction, and steel guide rails corresponding to the machine head are laid on top of the pipe piles. Step S6: After the machine head exits the hole along the steel guide rail, it is disassembled, lifted out, and the cofferdam is removed.
[0006] Preferably, in step S5, a preset mileage calculation is performed based on the pipe section jacking speed and the mixing pile construction speed, so that the concrete strength of the mixing pile when the machine head exits the hole is 30%-50% of the strength after complete solidification.
[0007] Preferably, the working well is a circular pit, and steel plates are pre-embedded in the corresponding area of the steel backrest. During installation, a crane is used to lift the steel backrest to the pre-embedded steel plate in the working well, and a theodolite and plumb line are used to adjust the plane of the steel backrest to be perpendicular to the jacking axis. After the steel backrest is installed, C30 concrete is used to fill and compact the gap between the steel backrest and the wall of the working well.
[0008] Preferably, during the pipe jacking process, thixotropic mud is injected into the outer wall of the pipe to reduce the frictional resistance between the outer wall of the pipe and the soil. Each pipe section is reserved with 2-4 grouting holes. The thixotropic mud is pumped to each grouting hole by a ground hydraulic grouting pump through two pipelines. After the pipe jacking construction is completed, the outer wall of the pipe is filled with cement mortar. The original thixotropic mud is removed by pressurizing the cement mortar, so that the jacked pipe is tightly bonded to the surrounding soil layer.
[0009] Preferably, multiple sets of anti-uplift piles are constructed along the length of the steel guide rail. Each set of anti-uplift piles includes two piles located on both sides of the steel guide rail. Above the same set of anti-uplift piles, a hoop corresponding to the machine head is fixed. An adjusting cylinder corresponding to the machine head is provided inside the hoop. The adjusting cylinder abuts against the outer wall of the machine head through a guide wheel.
[0010] Preferably, in step S6, after the excavator head exits the hole, the pull-out pile is removed by a chisel-removing device, which includes: A drill bit, the lower end of which is provided with drill teeth, and the upper end of which is connected to a drilling machine via a drill rod; The drill bushing is a sleeve-shaped structure with an open orientation. Inside the drill bushing are multiple chisel plates corresponding to the pull-out piles. The inscribed circles of the multiple chisel plates are adapted to the outer diameter of the drill bit. The lower edge of the chisel plate is provided with an inclined surface corresponding to the pull-out pile.
[0011] Preferably, the outer wall of the drill rod is provided with a slide bar extending along its axial direction, the upper end of the drill sleeve is provided with a central hole corresponding to the cross section of the drill rod, so as to be slidably assembled on the drill rod, a baffle corresponding to the drill sleeve is provided above the drill rod, and a buffer spring is provided between the baffle and the drill sleeve.
[0012] Preferably, in step S5, after the machine head exits the hole, the steel guide rail is removed, a crossbeam is erected on the pipe pile to support the water intake pipe, and after the water intake head flare and the water intake pipe are fabricated as a whole, a crane is used to lift them to the shore for temporary use. After the water intake pipe is hoisted into place, it is connected to the jacking pipe using a split joint. First, the upper half of the split joint is temporarily fixed to the water intake channel with bolts, and the lower half of the split joint is installed at the lower end of the jacking pipe. After the water intake pipe is in place, the bolts are tightened.
[0013] Beneficial effects: By setting up a cofferdam at the water intake point to isolate the water source, and by using mixing piles to reinforce a certain area of the water intake point, the stability of the water intake pipe can be ensured, thus eliminating the need for underwater construction and reducing construction difficulty. Attached Figure Description
[0014] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. Wherein: Figure 1 This is a schematic diagram of the machine head exiting the hole in a specific embodiment provided by the present invention; Figure 2 This is a simplified structural diagram of the chiseling device provided in a specific embodiment of the present invention; Figure 3 This is a simplified structural diagram of the waterstop ring in a specific embodiment of the present invention.
[0015] In the diagram: 1. Reinforced curtain; 2. Drill head; 3. Pipe section; 4. Pipe pile; 5. Cofferdam; 6. Hoop; 7. Steel guide rail; 8. Drill rod; 9. Drill sleeve; 10. Drill bit; 11. Removal plate; 12. Pull-out pile; 13. Baffle; 14. Buffer spring; 15. Working well; 16. Installation sleeve; 17. Waterstop ring; 18. Sealing sleeve; 19. Assembly ring. Detailed Implementation
[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.
[0017] In the description of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and do not require the invention to be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. The terms "connected" and "linked" used in this invention should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; they can refer to a direct connection or an indirect connection through intermediate components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.
[0018] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.
[0019] like Figure 1-2 As shown, a method for constructing a water intake pipeline using a slurry-balanced pipe jacking machine is described. This method utilizes the slurry pressure in the slurry chamber to balance the soil pressure and water pressure on the jacking working face. The excavation face is stabilized by adjusting the slurry pressure in the slurry chamber. The specific construction includes the following steps: Step S1, constructing a jacking guide seat at the bottom of the working shaft 15. The guide seat is made of concrete. A guide rail is laid above the guide seat. The guide rail is made of 14-type I-beams and supported and fixed on both sides by No. 10 channel steel. A steel backrest is installed on the side of the working shaft 15 away from the jacking direction. The working shaft 15 is a circular pit. Steel plates are pre-embedded in the corresponding area of the steel backrest. The pre-embedded steel plates adopt an integral structure of steel plates (4cm thick). During installation, a crane is used to lift the steel backrest to the pre-embedded steel plate in the working shaft 15. The theodolite and plumb line are used to adjust the plane of the steel backrest to be perpendicular to the jacking axis. After the steel backrest is installed, C30 concrete is used to fill and compact the gap between the steel backrest and the wall of the working shaft 15.
[0020] Step S2: Hoist the main jacking equipment to the top of the jacking guide seat. After the pipe jacking machine is placed on the guide rail, measure the center direction deviation and relative height difference of the front and rear ends, and adjust the main jacking equipment. After hoisting the head 2 into position, the head 2 enters the tunnel. Install the tunnel opening waterstop ring 17 between the head 2 and the tunnel opening. Step S3: Retract the main jacking equipment, hoist the pipe section 3 between the head 2 and the main jacking equipment, weld the pipe section 3 to the existing pipe, and apply anti-corrosion treatment to the joint. Then start the main jacking equipment to jack the pipe section 3. Measure the pipe posture every 300-500mm of jacking. The single correction amount should be ≤10mm to avoid sudden correction that could cause the pipe section 3 to crack. When jacking two pipes simultaneously, prioritize controlling the posture of the pipe jacked first. The subsequently jacked pipes must avoid the axis of the already formed pipe.
[0021] In step S4, multiple pipe sections 3 are jacked sequentially as the main jacking equipment extends and retracts. When the jacking head 2 reaches the preset position, the intermediate jacking chamber is hoisted. Although the jacking force calculation considers a safety factor, due to the numerous factors involved in the jacking process, the jacking force may exceed the design control range. To ensure safety during jacking, the first intermediate jacking chamber must be installed when the total thrust reaches 60% of the allowable jacking force of the intermediate jacking chamber. The intermediate jacking chamber must be activated when the main jacking cylinder reaches 90% of the allowable total thrust of the intermediate jacking chamber. After the intermediate jacking chamber is jacked, pipe sections 3 are hoisted for continuous jacking.
[0022] Step S5: When the jacking head 2 reaches the preset mileage, a cofferdam 5 is simultaneously constructed around the water intake. The preset mileage is calculated based on the jacking speed of pipe section 3 and the construction speed of the mixing piles, so that the concrete strength of the mixing piles when the jacking head 2 exits the tunnel is 30%-50% of the strength after complete solidification. Generally, the mixing piles are constructed within 7 days of the jacking head exiting the tunnel. The grouting areas of each mixing pile interlock to form a reinforcement curtain 1, thereby reinforcing the area inside the cofferdam 5. Multiple mixing equipment is used for the construction of the mixing piles to minimize the difference in construction time between each mixing pile. Furthermore, the mixing piles corresponding to the jacking trajectory of the pipe are constructed last, thereby reducing the difficulty of jacking the jacking head 2. At least two rows of pipe piles 4 are installed on the slope corresponding to the water intake outlet direction within the cofferdam 5. Steel guide rails 7 corresponding to the machine head 2 are laid above the pipe piles 4. The pipe piles 4 are driven using a DD103 guide rod type diesel pile hammer (10t), with a total of 10 pipe piles 4 driven. The horizontal spacing of the pipe piles 4 is 5m, and the longitudinal spacing is 4m, 4m, 4m, and 3m. The piling vessel's boom is erected to an appropriate height, and a cage-like support is installed at the bow. The piling vessel has one main hook (rated lifting capacity 50T) and two auxiliary hooks (rated lifting capacity 30T). The highest point is... Using the main hook to hoist the hammer, and the auxiliary hook to hoist the pipe pile 4 into the hammer, two auxiliary hooks are used to ensure the pile is lifted with the top facing upwards. The pipe pile 4 is then straightened, and the lower part is brought into the cage opening. The main hook (pulley block) is gradually loosened, allowing the hammer to slip onto the end of the steel pipe pile 4. Then, under the guidance of the surveyors, the boat is moved to position the pile. After the pile position and verticality meet the requirements, the pile is driven and stabilized. The hammer is then started to drive the pile, and a total station is used to monitor and direct the adjustment of the pile position at any time. To facilitate elevation control, red and white paint is used to mark the scale on the pile. After reaching the elevation, the hammer is stopped under the guidance of the surveyors. After verifying that the pile position and elevation are correct, the diesel hammer is hoisted, the boat is moved, and the next pile is driven.
[0023] In step S6, the cofferdam 5 can be a sheet pile. After the machine head 2 exits the hole along the steel guide rail 7, it is disassembled, lifted out, and then the cofferdam 5 is removed.
[0024] In one optional embodiment, during the pipe jacking process, thixotropic mud is injected into the outer wall of the pipe to reduce the frictional resistance between the outer wall of the pipe and the soil. Each pipe section 3 has 2-4 grouting holes. The thixotropic mud is pumped to each grouting hole by a ground hydraulic grouting pump through two pipelines. The thixotropic mud must be a special pre-made mud material, which is directly mixed with water on site. The principle of "combining synchronous grouting of the jacking head 2 with pipeline follow-up grouting" and "grouting before jacking, grouting as jacking, and timely grouting" is adopted to ensure the grouting effect.
[0025] After the pipe jacking construction is completed, the outer wall of the pipe is filled with cement mortar. The original thixotropic mud is removed by pressurizing the cement mortar, so that the jacked pipe is tightly bonded to the surrounding soil. Grouting is then performed through the grouting holes inside the pipe, with the grouting pressure controlled at 0.05 MPa. The grouting is performed no less than three times, with an interval of no more than 24 hours between each grouting.
[0026] In an optional embodiment, multiple sets of anti-uplift piles 12 are constructed along the length of the steel guide rail 7. The construction method and structure of the anti-uplift piles 12 are the same as those of the pipe piles 4. Each set of anti-uplift piles 12 includes two piles located on both sides of the steel guide rail 7. A hoop 6 corresponding to the machine head 2 is fixed above the same set of anti-uplift piles 12. The hoop 6 is a steel arch frame or a rigid square frame, which is fixed to the anti-uplift piles 12 by pre-embedded bolts. An adjustment cylinder corresponding to the machine head 2 is provided inside the hoop 6. The adjustment cylinder abuts against the outer wall of the machine head 2 through the guide wheel, thereby preventing the machine head 2 from floating during the tunneling process and ensuring the quality of the pipe jacking construction.
[0027] In step S6, generally, percussion drilling is used to remove the tension pile 12. However, due to the special location of the tension pile 12, in order to avoid the impact of the percussion drilling on the riverbed foundation, this application designs a removal device that uses a drilling method to remove the tension pile 12. After the drill head 2 exits the hole, the tension pile 12 is removed by the removal device. The removal device includes a drill bit 10 and a drill sleeve 9. The lower end of the drill bit 10 is provided with drill teeth. The diameter of the drill bit 10 is 0.6-0.8 times the diameter of the tension pile 12. The upper end of the drill bit 10 is connected to the drilling machine through a drill rod 8, and the tension pile 12 is removed by the drilling machine. Furthermore, due to the influence of the construction environment, in order to ensure that the drill bit 10 can be accurately positioned at the pile head of the pull-out pile 12, this application provides a drill sleeve 9. The drill sleeve 9 is a sleeve-shaped structure with the opening facing outwards. Inside the drill sleeve 9, there are multiple chisel plates 11 corresponding to the pull-out pile 12. The inscribed circles corresponding to the multiple chisel plates 11 are adapted to the outer diameter of the drill bit 10. The lower edge of the chisel plate 11 is provided with an inclined surface corresponding to the pull-out pile 12. The chisel plate 11 chisels away the area around the pull-out pile 12 by rotating with the drill bit 10, and the debris drilled out by the drill bit 10 is discharged through the gaps between the chisel plates 11.
[0028] The outer wall of the drill rod 8 is provided with a sliding strip extending along its axial direction. The upper end of the drill sleeve 9 is provided with a central hole corresponding to the cross section of the drill rod 8, so as to be slidably assembled on the drill rod 8. A baffle 13 corresponding to the drill sleeve 9 is provided above the drill rod 8. A buffer spring 14 is provided between the baffle 13 and the drill sleeve 9, so that the drill sleeve 9 has a pressing force towards the pile head. Multiple chiseling plates 11 are evenly distributed around the circumference of the drill sleeve 9.
[0029] In step S5, after the machine head 2 exits the hole, the steel guide rail 7 is removed, and a crossbeam is erected on the pipe pile 4 to support the water intake pipe. After the water intake head flare and the water intake pipe are made into a whole, a crane is used to lift them to the shore transfer site. After the water intake pipe is hoisted into place, it is connected to the jacking pipe using a split joint. First, the upper half of the split joint is temporarily fixed to the water intake channel with bolts, and the lower half of the split joint is installed at the lower end of the jacking pipe. After the water intake pipe is in place, the bolts are tightened.
[0030] In one optional embodiment, there are two water-stop rings 17, each made of rubber, located at both ends of the mounting sleeve 16. A first flange and a second flange are respectively provided at both ends of the mounting sleeve 16. The first flange is bolted to the outer periphery of the inlet corresponding to the working well 15. One water-stop ring 17 is fixed between the first flange and the inner wall of the working well 15. The second flange is bolted to the assembly ring 19, and the other water-stop ring 17 is fixed between the assembly ring 19 and the second flange. A sealing sleeve 18 is provided along the inner edge of the two rubber rings. The outer diameter of the sealing sleeve 18 matches the inner diameter of the water-stop ring 17, increasing the contact area with the jacking pipe. This allows the sealing sleeve 18, the mounting sleeve 16, and the rubber rings to form a closed cavity. Multiple connecting pipes are connected to the outer periphery of the mounting sleeve 16, corresponding to liquid or gas pressure pumps. This allows for the pumping of gas or other filling liquids according to actual use, thereby adjusting the pressure to allow the sealing sleeve 18 to contact the jacking pipe at different pressures, thus improving the compatibility.
[0031] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention shall be within the scope of protection of the pending claims of the present invention.
Claims
1. A method for constructing a water intake pipeline by pipe jacking, characterized in that, include: Step S1: Construct the jacking guide seat at the bottom of the working shaft and install a steel backrest on the side of the working shaft away from the jacking direction. Step S2: After hoisting the main jacking equipment to the top of the jacking guide seat, make adjustments. After hoisting the machine head into place, allow the machine head to enter the hole. Install the hole-sealing ring between the machine head and the hole opening. Step S3: The main jacking equipment retracts, and the pipe section is hoisted between the machine head and the main jacking equipment. The pipe section is welded to the existing pipe section, and the joint is treated with anti-corrosion. Then, the main jacking equipment is started to advance the pipe section. Step S4: As the main jacking equipment extends and retracts, multiple pipe sections are jacked in sequence. When the jacking head reaches the preset position, the intermediate room is hoisted, and then the pipe sections are hoisted down for continuous jacking. Step S5: When the machine head reaches the preset mileage, a cofferdam is constructed around the water intake simultaneously. Mixing piles are constructed inside the cofferdam, and the mixing piles interlock to reinforce the area inside the cofferdam. At least two rows of pipe piles are installed on the slope inside the cofferdam corresponding to the water intake outlet direction, and steel guide rails corresponding to the machine head are laid on top of the pipe piles. Step S6: After the machine head exits the hole along the steel guide rail, it is disassembled, lifted out, and the cofferdam is removed.
2. The method for constructing a water intake pipeline by pipe jacking according to claim 1, characterized in that, In step S5, a preset mileage calculation is performed based on the pipe section jacking speed and the mixing pile construction speed, so that the concrete strength of the mixing pile when the machine head exits the hole is 30%-50% of the strength after complete solidification.
3. The method for constructing a water intake pipeline by pipe jacking according to claim 1, characterized in that, The working well is a circular pit. Steel plates are pre-embedded in the corresponding area of the steel backrest. During installation, a crane is used to lift the steel backrest to the pre-embedded steel plate in the working well. The theodolite and plumb line are used to adjust the plane of the steel backrest to be perpendicular to the jacking axis. After the steel backrest is installed, C30 concrete is used to fill and compact the gap between the steel backrest and the wall of the working well.
4. The method for constructing a water intake pipeline by pipe jacking according to claim 1, characterized in that, During the pipe jacking process, thixotropic mud is injected into the outer wall of the pipe to reduce the frictional resistance between the outer wall of the pipe and the soil. Each pipe section is reserved with 2-4 grouting holes. The thixotropic mud is pumped to each grouting hole by a ground hydraulic grouting pump through two pipelines. After the pipe jacking construction is completed, the outer wall of the pipe is filled with cement mortar. The original thixotropic mud is removed by pressurizing the cement mortar, so that the jacked pipe is tightly bonded to the surrounding soil layer.
5. The method for constructing a water intake pipeline by pipe jacking according to claim 1, characterized in that, Multiple sets of anti-uplift piles are constructed along the length of the steel guide rail. Each set of anti-uplift piles includes two piles located on both sides of the steel guide rail. Above the same set of anti-uplift piles, a hoop corresponding to the machine head is fixed. An adjusting cylinder corresponding to the machine head is provided inside the hoop. The adjusting cylinder abuts against the outer wall of the machine head through a guide wheel.
6. The method for constructing a water intake pipeline by pipe jacking according to claim 5, characterized in that, In step S6, after the excavator head exits the hole, the pull-out pile is removed using a chisel-removing device, which includes: A drill bit, the lower end of which is provided with drill teeth, and the upper end of which is connected to a drilling machine via a drill rod; The drill bushing is a sleeve-shaped structure with an open orientation. Inside the drill bushing are multiple chisel plates corresponding to the pull-out piles. The inscribed circles of the multiple chisel plates are adapted to the outer diameter of the drill bit. The lower edge of the chisel plate is provided with an inclined surface corresponding to the pull-out pile.
7. The method for constructing a water intake pipeline by pipe jacking according to claim 6, characterized in that, The outer wall of the drill rod is provided with a slide bar extending along its axial direction. The upper end of the drill sleeve is provided with a central hole corresponding to the cross section of the drill rod, so as to be slidably assembled on the drill rod. A baffle corresponding to the drill sleeve is provided above the drill rod, and a buffer spring is provided between the baffle and the drill sleeve.
8. The method for constructing a water intake pipeline by pipe jacking according to claim 1, characterized in that, In step S5, after the machine head exits the hole, the steel guide rail is removed, and a crossbeam is erected on the pipe pile to support the water intake pipe. After the water intake head flare and the water intake pipe are fabricated as a whole, a crane is used to lift them to the shore transfer site. After the water intake pipe is hoisted into place, it is connected to the jacking pipe using a split joint. First, the upper half of the split joint is temporarily fixed to the water intake channel with bolts, and the lower half of the split joint is installed at the lower end of the jacking pipe. After the water intake pipe is in place, the bolts are tightened.