Non-excavation pipeline laying construction method

Abstract

The invention relates to the technical field of pipeline laying, in particular to a trenchless pipeline laying construction method which comprises the following steps: S1, surveying and setting out, and determining a construction position; s2, working pits are excavated, and the working pits are excavated in the two sides of the road surface correspondingly; s3, a drilling machine is placed in place, and the drilling machine is placed at a designated position; s4, guide hole drilling is conducted, specifically, the position of a guide drill bit of a drilling machine is adjusted, so that the guide drill bit drills into the soil according to a pre-designed track, and a drill hole communicating with the working pits on the two sides is drilled; s5, broaching is conducted, specifically, after the guiding drill bit reaches the expected position, the guiding drill bit is detached, a broaching drill bit is replaced, broaching is conducted through the broaching drill bit, then the broaching drill bits with the diameters increasing in sequence are sequentially replaced, broaching operation is repeatedly conducted, and the diameter of a drilled hole reaches the designed diameter; s6, pipe pulling is conducted, specifically, the pipeline is pulled into the drill hole, and the pipeline is laid at the designated position; and S7, pipeline welding. The method has the effect of avoiding adverse effects on life and traffic of residents in the construction process.

Description

Technical Field

[0001] The present application relates to the technical field of pipeline laying, and in particular to a trenchless pipeline laying construction method. Background Art

[0002] At present, with the acceleration of urbanization, the pace of urban municipal pipe network renewal and reconstruction has accelerated, and the number of pipeline laying projects of various diameters has continued to increase. The conventional method of laying underground pipelines is open-cut pipe laying. However, open-cut pipe laying requires circuit breaker construction, which will have an adverse impact on residents' life and transportation.

[0003] Therefore, a trenchless pipeline laying construction method is urgently needed. Summary of the invention

[0004] In order to avoid adverse effects of the construction process on residents' lives and transportation, the present application provides a trenchless pipeline laying construction method.

[0005] The present application provides a trenchless pipeline laying construction method, which adopts the following technical solution: A trenchless pipeline laying method comprises the following steps: S1: Measure and lay out to determine the construction location; S2: Excavation of working pits: excavation of working pits on both sides of the road surface; S3: Drilling rig in place, placing the drilling rig at the designated location; S4: Drilling the pilot hole, adjusting the position of the pilot drill bit of the drilling rig so that the pilot drill bit drills into the soil according to a pre-designed trajectory to drill a borehole connecting the working pits on both sides; S5: reaming. After the guide drill bit reaches the expected position, the guide drill bit is removed and replaced with a reaming drill bit. The reaming drill bit is used to reame the hole, and then reaming drill bits with increasing diameters are replaced in sequence to repeatedly reame the hole until the diameter of the hole reaches the designed diameter. S6: Pull the pipe, pull the pipe into the drill hole, so that the pipe is laid at the designated position; S7: Pipeline welding: after the pipeline reaches the designated location, the pipeline is welded to complete the laying of the pipeline.

[0006] By adopting the above technical solution, construction workers can use the drilling rig to accurately drill the guide hole, and ensure that the diameter of the hole meets the design requirements by gradually expanding the hole, so as to facilitate the pulling of the pipeline into the hole to achieve accurate laying of the pipeline. After the pipeline is laid, the pipeline connection is ensured to be firm through welding, which improves the construction efficiency and quality. In addition, the overall construction process is below the road surface and will not affect the road surface, which is conducive to avoiding the adverse impact of the construction process on the residents' life and traffic.

[0007] Optionally, in S4 and S5, a grouting hole is respectively formed on the guide drill bit and the reaming drill bit, and the grouting hole is connected to a slurry inlet pipe, and the slurry inlet pipe is used to transport mud into the grouting hole.

[0008] By adopting the above technical scheme, grouting holes are respectively opened on the guide drill bit and the reaming drill bit, and mud is transported into the grouting holes through the slurry inlet pipe, so that, on the first hand, the drill bit can be effectively lubricated, and the friction between the drill bit and the soil layer can be reduced, so as to reduce the wear of the drill bit and ensure the smooth progress of the drilling process; on the second hand, the injection of mud can also help clean the borehole, carry the drill cuttings and discharge them smoothly out of the hole, further improving the drilling efficiency and the stability of the hole wall, and ensuring the quality of pipeline laying; on the third hand, the design of the grouting hole enables the mud to be evenly distributed, avoiding the problems of drill sticking and hole wall collapse during the drilling process, thereby significantly improving the reliability and construction efficiency of the pipeline laying operation.

[0009] Optionally, in S4, a plurality of elevation points are first measured and placed on the ground along the drilling direction, and the plurality of elevation points are arranged at intervals. During the drilling process of the guide drill bit, the drilling trajectory is detected by a guide detector, and the relative positions of the drilling trajectory and the elevation points are observed to determine whether the drilling trajectory conforms to the designed trajectory.

[0010] By adopting the above technical solution, by pre-measuring and placing multiple elevation points in the drilling direction and using the guide detector to detect the drilling trajectory, the relative position of the drilling trajectory and the elevation points can be monitored in real time during the drilling of the guide drill bit, so as to timely judge and correct the deviation of the drilling trajectory from the designed trajectory, effectively improve the accuracy of the drilling trajectory, reduce construction errors, and improve the accuracy and construction efficiency of trenchless pipeline laying. In addition, by real-time monitoring and adjusting the drilling trajectory, potential impact of hard objects in the formation during the drilling process can be avoided, the wear of the drill tool can be reduced, the service life of the drill tool can be extended, and the construction cost can be reduced.

[0011] Optionally, in S2, after the excavation of the working pit is completed, railings are set around the working pit, and the railings are set to surround the working pit.

[0012] By adopting the above technical solution, railings are set up after the working pit is excavated, which can effectively prevent construction workers or nearby residents from accidentally falling into the working pit and improve the safety of the construction site. At the same time, the setting of railings also helps to regulate the order of the construction site, avoid irrelevant personnel from entering the work area and interfering with the construction process, further ensuring the construction quality and the safety of construction workers.

[0013] Optionally, in S6, the specific steps are as follows: S61: Connecting a pipe pulling head to the drilling rig, passing the pipe pulling head connected to the drilling rig at the end point through the drill hole and connecting it to one end of the pipeline to be laid, and connecting the other end of the pipeline to be laid to the pipe pulling head on the drilling rig at the start point; S62: Start the drilling rig, so that the drilling rig at the end point pulls the pipeline to be laid to move, and the drilling rig at the start point pushes the pipeline to be laid into the borehole, so as to lay the pipeline to be laid at the designated position.

[0014] By adopting the above technical solution, during the pipeline laying process, the drilling rig at the end point can pull the pipeline to be laid to move, and the drilling rig at the starting point can push the pipeline to be laid into the borehole, so as to facilitate the use of two-way force to make the pipeline to be laid smoothly enter the borehole and be laid at the designated position under the guidance of the pipe pulling head, thereby effectively improving the construction efficiency and construction accuracy, avoiding pipeline damage caused by single-point force application, and reducing the construction difficulty.

[0015] Optionally, after the pipeline is laid, remove the pipe pulling head and cut off the damaged part of the pipeline end to ensure normal connection of the pipeline.

[0016] By adopting the above technical solution, when the pipeline is laid, the pipe pulling head is removed and the damaged part of the pipe end is cut off to ensure that the pipe end is flat, so that the pipe can be smoothly connected to the designated position, ensuring the sealing and stability of the connection of the entire pipeline system, avoiding leakage problems caused by end damage, and improving construction quality and efficiency.

[0017] Optionally, a protective sleeve is provided on the pipe, and when the pipe is pulled into the borehole, the protective sleeve fills the space between the pipe and the inner wall of the borehole.

[0018] By adopting the above technical solution, when the pipeline is pulled into the borehole, the protective sleeve can be effectively filled between the pipeline and the inner wall of the borehole, so that a good isolation layer is formed between the pipeline and the inner wall of the borehole, thereby effectively reducing the direct impact of external pressure or objects such as gravel on the pipeline during the pulling-in process, so as to protect the surface of the pipeline from damage and ensure the integrity and service life of the pipeline; on the other hand, the protective sleeve can also provide uniform support for the pipeline to avoid deformation or damage of the pipeline due to local uneven force, thereby further improving the quality and reliability of pipeline laying.

[0019] Optionally, the protective cover is a light-curing protective cover.

[0020] Optionally, a support frame is provided on the outer peripheral side of the protective sleeve, and the support frame is located between the protective sleeve and the inner wall of the borehole. After the pipeline is laid at a designated position, concrete is pumped into the borehole to fill the support frame with concrete.

[0021] By adopting the above technical solution, during the pipeline laying process, the pipeline can drive the support frame to move into the borehole through the protective sleeve, so that the support frame is located between the protective sleeve and the inner wall of the borehole to provide support for the protective sleeve. When the pipeline is laid to the designated position, concrete is pumped into the borehole, and the concrete can be filled in the gap of the support frame, further enhancing the connection strength between the pipeline and the inner wall of the borehole, so that the pipeline is stably fixed inside the borehole, which is conducive to improving the quality and reliability of the entire pipeline laying construction.

[0022] Optionally, a plurality of snap-in grooves are opened on the circumferential outer wall of the protective sleeve around its own axial direction, and the supporting frame includes a plurality of supporting ribs, the number of the supporting ribs is equal to the number of the snap-in grooves, and one of the supporting ribs is inserted in one of the snap-in grooves and fixedly connected to the protective sleeve.

[0023] By adopting the above technical solution, a plurality of clamping grooves are opened on the circumferential outer wall of the protective sleeve around its own axis direction, and a support rib is inserted in a clamping groove, so that the support rib and the protective sleeve are not easy to move relative to each other, so that the support rib is used to support the protective sleeve, so as to effectively improve the structural stability of the protective sleeve. When concrete is pumped into the borehole, the concrete can be evenly filled between the support rib and the inner wall of the borehole, further enhancing the stability and durability between the pipeline and the surrounding soil layer, and reducing the displacement or deformation of the pipeline caused by changes in the external environment.

[0024] In summary, the present application includes at least one of the following beneficial technical effects: 1. Construction workers can use drilling rigs to accurately drill pilot holes and ensure that the diameter of the holes meets the design requirements by gradually expanding the holes, making it easier to pull the pipes into the holes to achieve accurate laying of the pipes. After the pipes are laid, welding is used to ensure that the pipes are firmly connected, which improves construction efficiency and quality. In addition, the overall construction process is below the road surface and will not affect the road surface, which helps to avoid adverse effects of the construction process on residents' lives and transportation; 2. The drilling rig at the end point pulls the pipeline to be laid to move, and the drilling rig at the starting point pushes the pipeline to be laid into the borehole, so that the two-way force can be used to make the pipeline to be laid smoothly enter the borehole under the guidance of the pipe pulling head and be laid at the designated position, thereby effectively improving the construction efficiency and construction accuracy, avoiding pipeline damage caused by single-point force, and reducing the construction difficulty; 3. Through the cooperation between the protective cover and the supporting frame, the pipeline can be provided with uniform support and protection, so that on the one hand, the pipeline surface is not easily damaged during the pipeline laying process, and on the other hand, the pipeline is prevented from being deformed or damaged due to local uneven force, which is beneficial to improve the quality and reliability of pipeline laying. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a construction flow chart of a trenchless pipeline laying construction method in Example 1 of the present application.

[0026] Figure 2 This is a schematic diagram of a trenchless pipeline laying construction in Example 1 of the present application.

[0027] Figure 3 This is a schematic diagram of a trenchless pipeline laying construction in Example 2 of the present application.

[0028] Figure 4 It is a partial cross-sectional view after the pipeline is laid in Example 3 of the present application.

[0029] Description of reference numerals: 1. Working pit; 2. Drilling machine; 3. Drilling hole; 4. Pipeline; 5. Protective cover; 51. Snap-in groove; 6. Support frame; 61. Support ribs. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1-4 This application is described in further detail.

[0031] The embodiment of the present application discloses a trenchless pipeline laying construction method.

[0032] It should be noted that, in the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0033] Embodiment 1: Reference Figure 1 and Figure 2 , the trenchless pipeline laying construction method includes the following steps: S1: Surveying and laying out. Surveyors will map the topography of the construction site and underground pipelines, and measure and lay out the locations of the planned pipelines and working pit 1 to the construction site according to the design drawings and fix the positioning piles.

[0034] S2: Excavation of working pit 1: Excavation of working pit 1 at designated positions on both sides of the road surface, and the excavation tool can be a hydraulic excavator or a manual excavation tool. In this embodiment, the plane size of the working pit 1 is 2mX2m, and after the excavation of the working pit 1 is completed, a railing is set around the working pit 1, and the railing surrounds the working pit 1.

[0035] S3: The drilling rig 2 is in place. The drilling rig 2 is placed in the working pit 1 and is fixed with anchor rods to ensure the stability of the drilling rig 2 during construction.

[0036] S4: Guide hole drilling, first measure and place multiple elevation points on the ground along the preset drilling direction, multiple elevation points are set at intervals, and the spacing between multiple elevation points is 1 meter. Then connect the guide drill bit to the drilling rig 2 and adjust the angle of the guide drill bit so that the position of the center line of the drill rod and the center axis of the pipeline 4 are within the allowable error range, so that the drilling rig 2 can drive the guide drill bit to drill into the soil according to the pre-designed trajectory to drill a borehole 3 connecting the working pits 1 on both sides of the road surface.

[0037] During the process of the pilot drill bit drilling, the guide detector is used to detect the trajectory of the borehole 3. By observing the relative position of the borehole 3 trajectory and the elevation point, it is determined whether the borehole 3 trajectory conforms to the designed trajectory. When it is found that the borehole 3 trajectory does not conform to the designed trajectory, it is corrected immediately to ensure the accuracy of the borehole 3 and records are kept. In addition, the construction personnel can use the depth, inclination, face angle and other values ​​measured by the guide detector to control the drilling angle of the drill rig 2 to ensure the accuracy of the inclination of the borehole 3.

[0038] S5: Hole expansion. When the guide drill bit reaches the expected position, the guide drill bit is removed and replaced with a hole expansion drill bit to perform the first hole expansion. After the first hole expansion is completed, a hole expansion drill bit with a larger diameter is replaced for the second hole expansion. The above operation is repeated for multiple hole expansions, and the diameters of the hole expansion drill bits used for multiple hole expansions are increased in sequence so that the diameter of the borehole 3 reaches the designed diameter.

[0039] In the above S4 and S5, a grouting hole is respectively opened on the guide drill bit and the reaming drill bit, and the grouting hole is connected to a slurry inlet pipe, which is used to transport mud into the grouting hole, so as to facilitate grouting into the borehole 3, thereby achieving the effects of cooling and lubricating the drill bit, softening the formation, assisting in breaking the formation, adjusting the drilling direction, carrying drill cuttings, stabilizing the hole wall, and lubricating the pipe wall during back dragging.

[0040] In this embodiment, tap water or a filtered water source with a pH value of not less than 6 is used when preparing the mud to ensure that there is no solidified material in the mud to prevent clogging of the spray hole. In the specific grouting, it is necessary to timely adjust the viscosity, specific gravity and other indicators of the mud according to the process and geological conditions to ensure the reliability of the mud performance. In addition, since the amount of mud required in the hole expansion process is large, an appropriate amount of mud should be prepared and stored in the mud pool before the hole expansion to ensure the supply of mud.

[0041] S6: Pull the pipe, connect the pipe pulling head to the drilling machine 2, so that the pipe pulling head connected to the drilling machine 2 passes through the borehole 3 and is connected to one end of the pipeline 4 to be laid, then start the drilling machine 2, so that the drilling machine 2 pulls the pipeline 4 to be laid to move, so as to lay the pipeline 4 to be laid at the designated position. When the laying of the pipeline 4 is completed, remove the pipe pulling head and cut off the damaged part of the end of the pipeline 4.

[0042] S7: Pipe 4 welding: After the pipe 4 reaches the designated position, the pipe 4 is welded to complete the laying of the pipe 4 and ensure that the pipe 4 can be smoothly connected to the inspection well position. In this embodiment, the pipe 4 is welded by hot melt welding, and the interface of the pipe 4 should be kept clean during welding to ensure the connection strength and prevent pipe breakage.

[0043] After the pipeline 4 is laid and passed the acceptance inspection, the construction can be completed.

[0044] Embodiment 2: Reference Figure 3 The difference between this embodiment and embodiment 1 is that two opposite working pits 1 are defined as the starting point and the ending point respectively. Then the above S6 includes the following steps: S61: Connect a pipe pulling head to the drilling rig 2, pass the pipe pulling head connected to the drilling rig 2 at the end point through the borehole 3 and connect it to one end of the pipeline 4 to be laid, and connect the other end of the pipeline 4 to be laid to the pipe pulling head on the drilling rig 2 at the starting point.

[0045] S62: Start the drilling rig 2, so that the drilling rig 2 at the end point pulls the pipeline 4 to be laid to move, and the drilling rig 2 at the start point pushes the pipeline 4 to be laid into the borehole 3, so as to lay the pipeline 4 to be laid at the designated position.

[0046] Embodiment 3: Reference Figure 4 The difference between this embodiment and the embodiment 1 is that a protective cover 5 is provided on the pipe 4. In this embodiment, the protective cover 5 is a light-curing protective cover, so that the protective cover 5 is conveniently connected and fixed to the pipe 4.

[0047] A plurality of snap-fit ​​grooves 51 are provided on the circumferential outer wall of the protective sleeve 5 around its own axis, and the axis of each snap-fit ​​groove 51 is parallel to the axis of the protective sleeve 5. A support frame 6 is provided on the outer circumference of the protective sleeve 5, and the support frame 6 includes a plurality of support ribs 61, and the number of the support ribs 61 is equal to the number of the snap-fit ​​grooves 51, and one support rib 61 is inserted into one snap-fit ​​groove 51 and fixedly connected to the protective sleeve 5.

[0048] When the pipe 4 enters the borehole 3, the pipe 4 can drive the support rib 61 to move into the borehole 3 through the protective sleeve 5. At this time, the support rib 61 is located between the protective sleeve 5 and the borehole 3 to provide support for the protective sleeve 5, thereby reducing the friction between the protective sleeve 5 and the inner wall of the borehole 3, so that the protective sleeve 5 and the pipe 4 can be transported into the borehole 3 more smoothly.

[0049] After the pipeline 4 is laid to the designated position, concrete is pumped into the borehole 3. The concrete can fill the gaps between the protective cover 5, the support ribs 61 and the inner wall of the borehole 3, further enhancing the connection strength between the pipeline 4 and the inner wall of the borehole 3, so that the pipeline 4 is stably fixed inside the borehole 3, thereby facilitating improving the quality and reliability of the entire pipeline 4 laying construction.

[0050] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A trenchless pipeline laying method, characterized in that: The following steps are involved: S1: Measure and lay out to determine the construction location; S2: Excavation of working pit (1): excavation of working pit (1) on both sides of the road surface; S3: The drilling machine (2) is positioned in place, and the drilling machine (2) is placed at a designated position; S4: Drilling a pilot hole, adjusting the position of the pilot drill bit of the drilling machine (2) so that the pilot drill bit drills into the soil according to a pre-designed trajectory, thereby drilling a borehole (3) connecting the working pits (1) on both sides; S5: expanding the hole. After the guide drill bit reaches the expected position, the guide drill bit is removed and replaced with a reaming drill bit. The hole is expanded using the reaming drill bit, and then reaming drill bits with increasing diameters are replaced in sequence to repeatedly expand the hole, so that the diameter of the drill hole (3) reaches the designed diameter. S6: pulling the pipe, pulling the pipe (4) into the drill hole (3), so that the pipe (4) is laid at a designated position; S7: Pipeline (4) welding: After the pipeline (4) reaches the designated position, the pipeline (4) is welded to complete the laying of the pipeline (4).

2. The trenchless pipeline laying method according to claim 1, characterized in that: In S4 and S5, a grouting hole is respectively formed on the guide drill bit and the reaming drill bit, and a slurry inlet pipe is connected to the grouting hole, and the slurry inlet pipe is used to transport mud into the grouting hole.

3. The trenchless pipeline laying method according to claim 1, characterized in that: In S4, a plurality of elevation points are first measured and placed on the ground along the drilling direction, wherein the plurality of elevation points are arranged at intervals. During the drilling process of the guide drill, a guide detector is used to detect the trajectory of the borehole (3). By observing the relative positions of the trajectory of the borehole (3) and the elevation points, it is determined whether the trajectory of the borehole (3) conforms to the designed trajectory.

4. The trenchless pipeline laying method according to claim 1, characterized in that: In S2, after the excavation of the working pit (1) is completed, a guardrail is arranged around the working pit (1), and the guardrail is arranged to surround the working pit (1).

5. The trenchless pipeline laying method according to claim 1, characterized in that: In S6, the specific steps are as follows: S61: Connect a pipe pulling head to the drilling rig (2), pass the pipe pulling head connected to the drilling rig (2) at the end point through the borehole (3) and connect it to one end of the pipeline (4) to be laid, and connect the other end of the pipeline (4) to be laid to the pipe pulling head on the drilling rig (2) at the start point; S62: Starting the drilling rig (2), so that the drilling rig (2) at the end point pulls the pipeline (4) to be laid to move, and the drilling rig (2) at the start point pushes the pipeline (4) to be laid into the borehole (3), so as to lay the pipeline (4) to be laid at the designated position.

6. The trenchless pipeline laying method according to claim 5, characterized in that: When the pipeline (4) is laid, the pipe pulling head is removed and the damaged portion of the end of the pipeline (4) is cut off to ensure that the pipeline (4) is normally connected.

7. The trenchless pipeline laying method according to claim 1, characterized in that: The pipe (4) is provided with a protective sleeve (5), and when the pipe (4) is pulled into the borehole (3), the protective sleeve (5) fills the space between the pipe (4) and the inner wall of the borehole (3).

8. The trenchless pipeline laying method according to claim 7, characterized in that: The protective cover (5) is a light-curing protective cover.

9. The trenchless pipeline laying method according to claim 7, characterized in that: A support frame (6) is provided on the outer peripheral side of the protective sleeve (5), and the support frame (6) is located between the protective sleeve (5) and the inner wall of the borehole (3). When the pipeline (4) is laid at a designated position, concrete is pumped into the borehole (3) so that the concrete fills the support frame (6).

10. The trenchless pipeline laying method according to claim 9, characterized in that: A plurality of snap-fit ​​grooves (51) are provided on the circumferential outer wall of the protective sleeve (5) around its own axial direction. The supporting frame (6) comprises a plurality of supporting ribs (61), the number of the supporting ribs (61) being equal to the number of the snap-fit ​​grooves (51). One of the supporting ribs (61) is inserted into one of the snap-fit ​​grooves (51) and fixedly connected to the protective sleeve (5).

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