Method for adjusting axis deviation caused by post-laying method of pipe installation

Abstract

The present application relates to the technical field of tunnel construction, and particularly relates to a method for adjusting axis offset generated by post-laying method immersed tube installation, which comprises the following steps: S1, installing a constant-height jacking device; S2, sinking of the immersed tube; S3, pulling together and deviation rectification of the immersed tube; S4, installation completion; and S5, base pad leveling. The pulling together and deviation rectification are completed by the constant-height jacking device, the problem that the traditional immersed tube needs to be accurately positioned before being placed on a bed or a supporting base and cannot be adjusted once placed is solved, the problem that the axis cannot be adjusted during the pulling together of the immersed tube is solved, accurate adjustment is realized, and installation accuracy is ensured.

Description

Technical Field

[0001] This invention relates to the field of tunnel construction technology, and in particular to a method for adjusting axial offset caused by post-laying immersed tube installation. Background Technology

[0002] During the construction of immersed tunnels, leveling is necessary to improve the flatness of the trench bottom. There are two leveling methods: one is the pre-laying method, an early method used in the field. Before the tunnel section is laid, sand and gravel are laid as a bedding layer. This is done by using a winch and steel cables on a work vessel to operate a specially designed scraper or steel plow, which scrapes the laid bedding material back and forth along guide rails with specified elevations and slopes set on both sides of the trench bottom. This method has many drawbacks. The second method is the post-laying method, in which the tunnel section is first laid on temporary supports on the bottom of the trench, creating a certain space at the bottom of the tunnel, and then filled and compacted with bedding material.

[0003] The post-laying method requires filling the bottom surface after the immersed tube sections have been sunk and connected. Currently, a hydraulic cylinder pulling system is used to pull two adjacent immersed tubes together, compressing the waterstop to form a sealed cavity between the two tubes. Then, hydraulic pressure is applied to reach the maximum deformation of the waterstop, completing the entire operation. However, the immersed tubes must be accurately positioned before being placed on the foundation bed or support base; otherwise, they cannot be adjusted after placement or the adjustment risk is extremely high. Summary of the Invention

[0004] To address the shortcomings of the existing technology, this invention provides a method for adjusting axial offset during the post-laying method of immersed tube installation, which replaces the traditional hydraulic cylinder and precisely adjusts the axis of the immersed tube to ensure installation accuracy.

[0005] This invention provides a method for adjusting axial offset caused by post-laying pipe installation, comprising the following steps:

[0006] S1. Install the elevation setting jacking device:

[0007] The constant elevation jacking device is hoisted and installed at the construction position of the constant elevation jacking device, and the constant elevation jacking device's elevation cylinder is vertically adjusted to the design elevation.

[0008] S2. Sinking of the immersed tunnel:

[0009] The immersed tube to be installed is transported to the designed construction location using a sinking barge, and then the immersed tube is lowered into contact with the fixed elevation cylinder. The immersed tube is located at the designed height. The lifting force of the sinking barge is adjusted so that the force exerted by the immersed tube on the constant elevation jacking device is within the bearing capacity range of the constant elevation jacking device.

[0010] S3. Pulling and straightening of the immersed tube:

[0011] The constant elevation jacking device drives the pipe to be installed to be jacked multiple times along the pulling direction and adjusts it in the axial direction to correct the pipe to be installed during the pulling process until a sealed cavity is formed between the waterstop of the pipe to be installed and the installed pipe.

[0012] S4. Installation complete:

[0013] The installation of the immersed tube to be installed is completed by hydraulic pressing. During the hydraulic pressing process, the pressing rate is controlled to be the same as the pushing rate of the constant elevation jacking device until the deformation of the waterstop reaches the maximum value, and the installation of the immersed tube is completed.

[0014] S5. Leveling the base:

[0015] The gap between the pipe to be installed and the base was completely filled using the sand blowing method.

[0016] In this technical solution, the method for adjusting the axial offset caused by the post-laying method of immersed tube installation uses a constant elevation jacking device to complete the pulling and correction, which solves the drawback of the traditional method where the immersed tube needs to be precisely positioned before being placed on the foundation bed or support base, and cannot be adjusted once placed. At the same time, it solves the problem that the axis cannot be adjusted during the pulling and closing of the immersed tube, achieving precise adjustment and ensuring installation accuracy.

[0017] In some embodiments of this application, the constant elevation jacking device further includes

[0018] The base is located at the bottom, and the elevation cylinder is vertically arranged above the base;

[0019] A jacking cylinder is mounted on the base, and its extension and retraction direction is the same as that of the elevation setting cylinder. The jacking cylinder is located on the side closer to the installed tube. The jacking cylinder and the elevation setting cylinder work together to maintain the tube to be installed at a set height for pulling and closing.

[0020] The jacking and walking cylinder is horizontally positioned between the elevation setting cylinder and the jacking and cooperating cylinder. The cylinder barrel of the jacking and walking cylinder is fixed on the elevation setting cylinder, and the piston rod of the jacking and walking cylinder is fixed on the jacking and cooperating cylinder.

[0021] The correction cylinder is fixed on the base and located on one side of the push-fit cylinder, and the extension and retraction direction of the correction cylinder is perpendicular to the extension and retraction direction of the push-stepping cylinder.

[0022] In some embodiments of this application, the correction and docking of the immersed tube in step S3 are specifically performed as follows:

[0023] S31. The jacking cylinder extends to the design elevation and contacts the submerged pipe to be installed;

[0024] S32. The elevation setting cylinder retracts a certain distance, and the pipe to be installed is maintained at the design elevation by the jacking cylinder.

[0025] S33. The jacking stepping cylinder extends a certain distance, the jacking cooperating cylinder moves forward the same distance, and while the jacking cooperating cylinder moves, it drives the pipe to be installed to be jacked and moved forward in the pulling direction by a corresponding distance.

[0026] S34. The elevation setting cylinder extends again to the design elevation and contacts the pipe to be installed. The jacking cylinder is retracted, the walking jacking cylinder is retracted, and the jacking cylinder is retracted.

[0027] S35. Repeat steps S31-S34 until a sealed cavity is formed between the waterstop of the pipe to be installed and the installed pipe. Before the sealed cavity is formed, the axis of the pipe to be installed is adjusted by the extension and retraction of the correction cylinder to drive the push-fit cylinder to move, so as to ensure accurate installation positioning.

[0028] In some embodiments of this application, in step S35, the axis is measured by measuring towers symmetrically arranged at both ends of the immersed tube to be installed, and the axis of the immersed tube to be installed is adjusted by the extension and retraction of the correction cylinder driving the jacking cylinder to move, thereby ensuring installation accuracy.

[0029] In some embodiments of this application, the first nose support is provided at the head end of the immersed tube to be installed, and the second nose support is provided at the end of the installed immersed tube. In step S35, before the waterstop of the immersed tube to be installed and the installed immersed tube form a sealed cavity, the first nose support and the second nose support are connected. When the immersed tube to be installed moves, the lower surface of the first nose support moves along the upper surface of the second nose support. The second nose support guides and limits the first nose support to prevent the head end of the immersed tube to be installed from deviating during the movement.

[0030] In some embodiments of this application, the base includes a push slide that allows the push cylinder to move back and forth, and a correction slide that allows the correction cylinder to move back and forth. The push slide and the correction slide are arranged perpendicularly and in a “├” shape.

[0031] In some embodiments of this application, in step S1, to ensure that the constant elevation jacking device is installed firmly and to prevent collapse, a gravel pad is laid on the base before installing the constant elevation jacking device, and a support pad is placed on the gravel pad, and the constant elevation jacking device is installed on the support pad.

[0032] In some embodiments of this application, a high-friction coefficient material is laid on top of the crushed stone pad to increase the friction between the support pad and the crushed stone pad, preventing the support pad from shifting during the jacking process and affecting the installation accuracy.

[0033] In some embodiments of this application, the top surface of the piston rod of the calibration cylinder and the top surface of the jacking cylinder are both provided with a high friction coefficient material to increase the stability of the tube jacking process and ensure installation accuracy.

[0034] In some embodiments of this application, in step S4, during the hydraulic pressing process, the pressing rate is the same as the elongation rate of the jacking walking cylinder, so as to ensure that the immersed tube can be stably and accurately connected.

[0035] Based on the above technical solution, the method of the present invention for adjusting the axial offset caused by the post-laying method of immersed tube installation completes the pulling and correction by a constant elevation jacking device. It solves the drawback of the traditional method where the immersed tube needs to be accurately positioned before being placed on the foundation bed or support base, and cannot be adjusted once placed. At the same time, it solves the disadvantage that the axis cannot be adjusted during the pulling and closing of the immersed tube, thus achieving precise adjustment and ensuring installation accuracy.

[0036] By cooperating with each other, the calibration height cylinder, the jacking and cooperating cylinder, and the jacking and walking cylinder, the piston rods of the calibration height cylinder and the jacking and cooperating cylinder are equipped with high friction coefficient materials, which replace the pulling force of the traditional pulling cylinder with the friction force between the jacking and cooperating cylinder and the sinking tube, thus realizing the pulling and closing of the sinking tube.

[0037] To prevent the support pad from settling, two lifting cylinders are installed: a leveling cylinder and a jacking cylinder. The leveling cylinder adjusts the sinking pipe to the design elevation, and the jacking cylinder enables step-by-step jacking.

[0038] By setting a correction cylinder on the jacking cylinder, the offset of the tube in the axial direction is adjusted, and intervention is made during the pulling process to ensure installation accuracy. Attached Figure Description

[0039] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0040] Figure 1 This is a schematic diagram of the main structure of the constant elevation jacking device in an embodiment of the present invention;

[0041] Figure 2 This is a top view of the constant elevation jacking device in an embodiment of the present invention;

[0042] Figure 3This is a schematic diagram of the left-side structure of the constant elevation jacking device in an embodiment of the present invention;

[0043] Figure 4 This is a schematic diagram of the submerged tube to be installed before it is lowered in an embodiment of the present invention;

[0044] Figure 5 This is a schematic diagram of the structure of the constant elevation jacking device in an embodiment of the present invention when the constant elevation cylinder is extended;

[0045] Figure 6 This is a schematic diagram of the immersed tube to be installed being lowered to the design elevation in an embodiment of the present invention;

[0046] Figure 7 This is a schematic diagram of the submerged tube to be installed being pushed forward in an embodiment of the present invention;

[0047] Figure 8 This is a schematic diagram of the hydraulic cylinder for setting the elevation when the submerged tube to be installed is pushed forward in an embodiment of the present invention;

[0048] Figure 9 This is a schematic diagram of the hydraulic cylinder for setting the elevation when the submerged tube to be installed is pushed forward again in an embodiment of the present invention;

[0049] Figure 10 This is a schematic diagram of the structure when the immersed tube to be installed and the already installed immersed tube form a sealed cavity in an embodiment of the present invention;

[0050] Figure 11 This is a schematic diagram showing the positional relationship between the first nose support and the second nose support when the immersed tube to be installed and the already installed immersed tube are pulled together in an embodiment of the present invention.

[0051] In the picture,

[0052] 10. Constant elevation jacking device; 11. Base; 111. Jacking slide; 112. Correction slide; 12. Elevation setting cylinder; 121. Piston rod; 13. Jacking matching cylinder; 131. Cylinder sleeve; 132. Sliding block; 14. Jacking walking cylinder; 141. Cylinder barrel; 142. Piston rod; 15. Correction cylinder; 20. Submerged tube to be installed; 21. First nose support; 211. First limiting groove; 30. Installed submerged tube; 31. Second nose support; 311. Second limiting protrusion; 40. Crushed stone pad layer; 41. Support pad block. Detailed Implementation

[0053] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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 without creative effort are within the scope of protection of the present invention.

[0054] In the description of this invention, it should be understood that the terms "center", "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0055] The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature.

[0056] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0057] In this embodiment, the method for adjusting the axial offset caused by the post-laying method of pipe installation is implemented using a constant elevation jacking device 10, which includes...

[0058] The base 11 is located at the bottom of the entire jacking device and serves to support the upper hydraulic cylinder.

[0059] The elevation cylinder 12 is vertically fixed above the base 11, and the extension of its piston rod 121 is a fixed value. In this embodiment, the extension is the design elevation of the sinking pipe.

[0060] The jacking cylinder 13 is positioned above the base 11, parallel to the elevation cylinder 12, and located on the side closer to the installed tube 30. The jacking cylinder 13 and the elevation cylinder 12 work together in an alternating lifting motion to maintain the tube 20 to be installed at a set height for pulling and closing.

[0061] The jacking and walking cylinder 14 is horizontally positioned between the elevation setting cylinder 12 and the jacking and cooperating cylinder 13. The cylinder barrel 141 of the jacking and walking cylinder 14 is fixed on the cylinder barrel of the elevation setting cylinder 12, and the piston rod 142 of the jacking and walking cylinder 14 is fixed on the cylinder barrel of the jacking and cooperating cylinder 13. When the jacking and walking cylinder 14 extends, it pushes the jacking and cooperating cylinder 13 to move in the pulling and closing direction, thereby driving the underpinned tube 20 to be installed to move in the pulling and closing direction.

[0062] The correction cylinder 15 is fixed on one side of the jacking cylinder 13, and the extension and retraction direction of the correction cylinder 15 is perpendicular to the extension and retraction direction of the jacking cylinder 14. When the axis of the tube to be installed 20 deviates during the docking process, the correction cylinder 15 extends and retracts, driving the jacking cylinder 13 to move left and right along the line perpendicular to the axis, so as to achieve precise adjustment of the axis of the tube to be installed 20.

[0063] In order to enable the jacking cylinder 13 and the correction cylinder 15 to move smoothly and easily, the base 11 is a "├" shaped structure with mutual perpendicularity, including a jacking slide 111 that enables the jacking cylinder 13 to move back and forth, and a correction slide 112 that enables the correction cylinder 15 to move back and forth. The jacking slide 111 is represented by the horizontal line in the "├" shape, and the correction slide 112 is represented by the vertical line in the "├" shape.

[0064] In this embodiment, as Figure 3 As shown, the jacking slide 111 has a "T" shaped structure. A cylinder sleeve 131 is fitted onto the outer side of the bottom end of the cylinder barrel of the jacking cylinder 13. The longitudinal section of the cylinder sleeve 131 is two opposing "L" shapes. The cylinder sleeve 131 can slide back and forth along the jacking slide 111, meaning the jacking cylinder 13 can move back and forth along the jacking slide, driving the submerged tube 20 to be installed to move in the pulling direction; as... Figure 1 As shown, the alignment guideways 112 are all U-shaped structures. The bottom of the cylinder of the jacking cylinder 13 is provided with an inverted T-shaped slider 132. The slider 132 slides back and forth in the alignment guideway 112 to make precise axial adjustment of the tube 20 to be installed. In order to reduce the resistance of the movement of the jacking cylinder 13 and the alignment cylinder 15 and to better perform jacking and alignment, in this embodiment, the jacking guideway 111 and the alignment guideway 112 are made of stainless steel with a low coefficient of friction, and lubricating oil can be used on the jacking guideway and the alignment guideway to further reduce frictional resistance.

[0065] The method for adjusting the axial offset caused by the post-laying method of pipe sinking installation using the aforementioned constant elevation jacking device 10 includes the following steps:

[0066] S1. Install the elevation setting jacking device 10:

[0067] To ensure the constant elevation jacking device 10 is securely installed and prevents collapse, a crushed stone cushion layer 40 is laid on the base at its designed construction location before installation. A concrete support block 41 is then placed on top of the crushed stone cushion layer 40. The constant elevation jacking device 10 is then hoisted and installed on the concrete support block 41. The constant elevation jacking devices 10 are symmetrically installed at both ends of the pipe to be installed 20. The elevation-setting cylinder 12 of the constant elevation jacking device 10 is then vertically adjusted to the designed elevation, such as... Figures 4-5 As shown;

[0068] S2. Sinking of the immersed tunnel:

[0069] The immersed tube 20 to be installed is transported to the designed construction position using a sinking barge. In this embodiment, the designed construction position of the constant elevation jacking device 10 is near the tail end of the construction position of the immersed tube 20. After the immersed tube 20 is lowered to the bottom and contacts the constant elevation cylinder 12, the lifting force of the sinking barge is adjusted so that when the immersed tube 20 is at the designed height, the force exerted by the immersed tube 20 on the constant elevation jacking device 10 is within the bearing capacity range of the constant elevation jacking device 10. Since the constant elevation jacking device 10 is close to the tail end of the immersed tube, before docking, the distribution of ballast water inside the immersed tube or the sinking force of the sinking barge at both ends of the immersed tube is generally adjusted so that the weight of the tail end of the immersed tube is greater than the weight of the head end, which can keep the immersed tube moving smoothly and prevent it from sinking, while also facilitating the docking of the head end of the immersed tube.

[0070] S3. Pulling and straightening of the immersed tube:

[0071] The constant elevation jacking device 10 drives the immersed tube 20 to be installed to be jacked multiple times along the pulling direction and is adjusted in the axial direction to correct the deviation of the immersed tube 20 during the pulling process until a sealed cavity is formed between the waterstop of the immersed tube 20 to be installed and the installed immersed tube 30.

[0072] Specifically:

[0073] S31. Since the elevation setting cylinder 12 has been extended to the design elevation in step S1, the jacking cylinder 13 is also extended to the design elevation in S31, matching the height of the elevation setting cylinder 12. At this time, the piston rod of the jacking cylinder 13 also contacts the underpinning tube 20 to be installed. Figure 6 As shown;

[0074] S32, such as Figures 7-8As shown, the elevation cylinder 12 retracts a certain distance D. In this embodiment, the retraction distance D is 20mm. At this time, the tube to be installed 20 is maintained at the design elevation by the push-fit cylinder 13. The lifting force of the sinking barge can ensure that the force applied by the tube to be installed 20 to the push-fit cylinder 13 is within its load-bearing range, and the friction between the piston rod of the push-fit cylinder 13 and the bottom of the tube to be installed 20 can drive the tube to be installed 20 to move forward synchronously.

[0075] S33, the jacking stepping cylinder 14 extends horizontally, pushing the jacking matching cylinder 13 to move forward the same distance along the jacking slide 111. While the jacking matching cylinder 13 moves, it drives the tube to be installed 20 to move forward. The friction between the piston rod of the jacking matching cylinder 13 and the bottom of the tube to be installed 20 can drive the tube to be installed 20 to move forward synchronously. After the tube to be installed 20 moves a corresponding distance in the pulling direction, the jacking stepping cylinder 14 stops extending.

[0076] S34, the elevation setting cylinder 12 extends again to the design elevation, contacting the submerged pipe 20 to be installed. Then, the jacking cylinder 13 retracts, and the submerged pipe 20 is maintained at the design elevation by the elevation setting cylinder 12. Then, the stepping jacking cylinder 14 retracts, and the jacking cylinder 13 is also retracted. Figure 9 As shown;

[0077] S35. Repeat steps S31-S34 until a sealed cavity is formed between the waterstop of the immersed tube 20 to be installed and the installed immersed tube. Before the formation of the sealed cavity, in this embodiment, the axis is measured by a measuring tower (not shown in the figure). The measuring tower is a tower-shaped steel structure that is installed on the top surface of the immersed tube in advance. Its height is determined according to the immersion depth and measurement requirements. Two measuring towers are set in front of and behind each section of the immersed tube, and a measuring mark is set on its top. The specific process of measuring the axis of the immersed tube by the measuring tower is a relatively mature process in the prior art, and will not be described in detail here.

[0078] A first nose support 21 is provided at the first end of the immersed tube 20 to be installed, and a second nose support 31 is provided at the end of the already installed immersed tube 30. In step S35, before a sealed cavity is formed between the waterstop of the immersed tube 20 to be installed and the already installed immersed tube, during the pulling and closing process of the immersed tube, the first nose support 21 and the second nose support 31 are connected, such as... Figure 6 , Figures 9-10 As shown; in this embodiment, the bottom of the first nose pad 21 is provided with a first limiting groove 211, and the top of the second nose pad 31 is provided with a second limiting protrusion 311. When the tube to be installed 20 moves, the first limiting groove 211 of the first nose pad 21 moves along the second limiting protrusion 311 of the second nose pad. The second limiting protrusion 311 guides and limits the second limiting protrusion 311, as shown. Figure 10 As shown, this prevents the head end of the immersed tube 20 to be installed from shifting during the pulling and moving process.

[0079] Specifically, after the stepping jacking cylinder 14 extends once, pushing the immersed tube 20 to be installed forward a corresponding distance, the measuring tower measures whether the axis of the immersed tube to be installed has shifted. If a shift occurs, the extension and retraction of the correction cylinder 15 drives the jacking cylinder to move left and right in a direction perpendicular to the axis, adjusting the axis of the immersed tube 20 to ensure accurate installation positioning. If the axis of the immersed tube has not shifted, steps S31-S34 are repeated, and the axis of the immersed tube 20 to be installed is measured again. This process is repeated until a sealing cavity 50 is formed between the waterstop of the immersed tube 20 to be installed and the installed immersed tube. Figure 10 As shown.

[0080] S4. Installation complete:

[0081] A drainage device is installed inside the installed pipe 30. Water is discharged from the sealed cavity 50 using a hydraulic pressing method. During the hydraulic pressing process, the pressing rate is controlled to be the same as the pressing rate of the constant elevation jacking device 10. That is, after the water is discharged per unit time, the distance the pipe 20 to be installed advances is the same as the extension distance of the stepping jacking cylinder 14 per unit time, until the deformation of the waterstop reaches the maximum value, and the installation of the pipe is completed.

[0082] S5. Leveling the base:

[0083] The gap between the immersed tube 20 to be installed and the base is completely filled using the sand blowing method. The sand blowing method is also a common process in the existing immersed tube installation process, and will not be described in detail here. Then, steps S1-S5 are repeated to install the next section of the immersed tube.

[0084] In this embodiment, the extension distance of the stepping jacking cylinder 14 each time enables the jacking and cooperating cylinder to move to the intersection of the jacking slide 111 and the correction slide 112, so that when the axis of the tube to be installed 20 deviates significantly, the correction cylinder 15 can push the tube to be installed 20 to adjust in the axial direction.

[0085] To ensure sufficient friction between the jacking cylinder 13 and the tube to be installed, so as to overcome the gravity of the tube on the jacking cylinder 13 and drive the tube to move, while increasing the stability of the tube jacking process and ensuring installation accuracy, the top surface of the piston rod of the calibration cylinder 12 and the top surface of the piston rod of the jacking cylinder 13 are both made of a material with a high coefficient of friction, such as powder alloy or rubber.

[0086] In this embodiment, a high friction coefficient material, such as powder alloy or rubber, is also provided between the crushed stone cushion layer 40 and the concrete support pad 41, so that the concrete support pad 41 is stably fixed on the crushed stone cushion layer 40 and is not affected by the movement of the sinking pipe.

[0087] The present invention provides a method for adjusting the axial offset caused by the post-laying method of immersed tube installation. It completes the pulling and correction by a constant elevation jacking device, which solves the drawback of the traditional method where the immersed tube needs to be precisely positioned before being placed on the foundation bed or support base and cannot be adjusted once placed. At the same time, it solves the problem that the axis cannot be adjusted during the pulling and closing process of the immersed tube, thus achieving precise adjustment and ensuring installation accuracy.

[0088] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0089] The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the present invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. A method for adjusting axial offset caused by post-laying pipe installation, characterized in that: Includes the following steps: S1. Install a constant elevation jacking device: The constant elevation jacking device is hoisted and installed at the construction location of the constant elevation jacking device, and the elevation cylinder of the constant elevation jacking device is vertically adjusted to the design elevation. S2. Sinking of the immersed tunnel: The immersed tube to be installed is transported to the designed construction location using a sinking barge, and then the immersed tube is lowered into contact with the fixed elevation cylinder. The immersed tube is located at the designed height. The lifting force of the sinking barge is adjusted so that the force exerted by the immersed tube on the constant elevation jacking device is within the bearing capacity range of the constant elevation jacking device. S3. Pulling and straightening of the immersed tube: The constant elevation jacking device drives the pipe to be installed to be jacked multiple times along the pulling direction and adjusts it in the axial direction to correct the pipe to be installed during the pulling process until a sealed cavity is formed between the waterstop of the pipe to be installed and the installed pipe. S4. Installation complete: The installation of the immersed tube to be installed is completed by hydraulic pressing. During the hydraulic pressing process, the pressing rate is controlled to be the same as the pushing rate of the constant elevation jacking device until the deformation of the waterstop reaches the maximum value, and the installation of the immersed tube is completed. S5. Leveling the base: The gap between the submerged tube to be installed and the base was completely filled using the sand blowing method. The constant elevation jacking device also includes The base is located at the bottom, and the elevation cylinder is vertically arranged above the base; A jacking cylinder is mounted on the base, and its extension and retraction direction is the same as that of the elevation setting cylinder. The jacking cylinder is located on the side closer to the installed tube. The jacking cylinder and the elevation setting cylinder work together to maintain the tube to be installed at a set height for pulling and closing. The jacking and walking cylinder is horizontally positioned between the elevation setting cylinder and the jacking and cooperating cylinder. The cylinder barrel of the jacking and walking cylinder is fixed on the elevation setting cylinder, and the piston rod of the jacking and walking cylinder is fixed on the jacking and cooperating cylinder. The correction cylinder is fixed on the base and located on one side of the push-fit cylinder, and the extension and retraction direction of the correction cylinder is perpendicular to the extension and retraction direction of the push-stepping cylinder. The base includes a push slide that allows the push cylinder to move back and forth, and a correction slide that allows the correction cylinder to move back and forth. The push slide and the correction slide are arranged perpendicularly and in a "├" shape. The specific steps for pulling and correcting the immersed tube in step S3 are as follows: S31. The jacking cylinder extends to the design elevation and contacts the submerged pipe to be installed; S32. The elevation setting cylinder retracts a certain distance, and the pipe to be installed is maintained at the design elevation by the jacking cylinder. S33. The pushing stepping cylinder extends a certain distance, and the pushing and cooperating cylinder moves forward the same distance. At the same time as the pushing and cooperating cylinder moves, the friction between the piston rod of the pushing and cooperating cylinder and the bottom of the tube to be installed drives the tube to be installed to push and move a corresponding distance in the pulling direction. S34. The elevation setting cylinder extends again to the design elevation and contacts the pipe to be installed. The jacking cylinder is retracted. The jacking stepping jacking cylinder is retracted. The jacking cylinder is retracted. S35. Repeat steps S31-S34 until a sealed cavity is formed between the waterstop of the pipe to be installed and the installed pipe. Before the sealed cavity is formed, the axis of the pipe to be installed is adjusted by moving the push-fit cylinder through the extension and retraction of the correction cylinder.

2. The method for adjusting axial offset caused by post-laying pipe installation according to claim 1, characterized in that, In step S35, the axis is measured by measuring towers symmetrically set at both ends of the immersed tube to be installed. The axis of the immersed tube to be installed is adjusted by moving the jacking cylinder through the extension and retraction of the correction cylinder.

3. The method for adjusting axial offset caused by post-laying pipe installation according to claim 2, characterized in that, The first nose support is provided at the first end of the immersed tube to be installed, and the second nose support is provided at the end of the installed immersed tube. In step S35, before the waterstop of the immersed tube to be installed and the installed immersed tube form a sealed cavity, the first nose support and the second nose support are connected. When the immersed tube to be installed moves, the lower surface of the first nose support moves along the upper surface of the second nose support.

4. The method for adjusting axial offset caused by post-laying pipe installation according to claim 1, characterized in that, In step S1, before installing the constant elevation jacking device, a gravel pad is laid on the base, and a support pad is placed on top of the gravel pad. The constant elevation jacking device is then installed on the support pad.

5. The method for adjusting axial offset caused by post-laying pipe installation according to claim 4, characterized in that, A material with a high coefficient of friction is laid on top of the crushed stone cushion layer.

6. The method for adjusting axial offset caused by post-laying pipe installation according to claim 1, characterized in that, The top surface of the piston rod of the calibration cylinder and the top surface of the push-fit cylinder are both provided with a material with a high coefficient of friction.

7. The method for adjusting axial offset caused by post-laying pipe installation according to claim 1, characterized in that, In step S4, during the hydraulic pressing process, the pressing rate is the same as the elongation rate of the push-stepping cylinder.

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