Pipe jacking pipe withdrawing and correcting construction method

Abstract

This invention relates to the field of pipe jacking construction technology, specifically to a method for correcting pipe jacking during pipe withdrawal. The method includes: Step S1, connecting the intermediate sections between adjacent pipe jacking sections to form a connected pipe jacking; Step S2, installing a main withdrawal device and an auxiliary withdrawal device at the exit of the pipe jacking shaft; Step S3, setting an overall withdrawal strategy and a segmented withdrawal strategy, selecting the withdrawal strategy based on a preset jacking force limit; if the overall withdrawal strategy is selected, only the main withdrawal device is used for pipe withdrawal; if the segmented withdrawal strategy is selected, both the main withdrawal device and the auxiliary withdrawal device are used for pipe withdrawal; Step S4, during the withdrawal of the connected pipe using either the overall or segmented withdrawal strategy, adjusting the angle between the intermediate sections at the head to correct it. The construction method provided by this invention can more conveniently correct deviations of the jacking head during pipe jacking construction.

Description

Technical Field

[0001] This invention relates to the field of pipe jacking construction technology, and specifically to a method for correcting pipe pullback in pipe jacking construction. Background Technology

[0002] With the rise of various construction methods, pipe jacking has become a common method for underground pipeline construction. Pipe jacking eliminates the need for surface excavation, allowing pipelines to cross highways, railways, rivers, underground structures, and various underground pipelines, which is very convenient. However, during pipe jacking, due to local geological conditions or problems with the installation of construction equipment, the pipe head may deviate from the predetermined axis during the jacking process, resulting in a certain deviation. If this deviation is not corrected in time, it will gradually increase, affecting subsequent construction and potentially causing safety problems in severe cases.

[0003] Existing methods for correcting deviations in head jacking pipes mainly involve using special tools to correct the jacking path of the head jacking pipe during the continued jacking process, bringing it back to the predetermined axis. While this method can correct deviations of the head jacking pipe from the predetermined axis without affecting the construction progress, it is only suitable for cases with small deviations and may cause the deviation to continue to increase during the continued jacking process. Summary of the Invention

[0004] To address the aforementioned technical problems, the present invention aims to provide a method for correcting pipe pullback in jacking pipelines. The specific technical solution adopted is as follows:

[0005] One embodiment of the present invention provides a construction method for correcting pipe pullback in jacking pipelines:

[0006] Step S1: Connect the intermediate stations between adjacent jacking pipes to form a connecting jacking pipe;

[0007] Step S2: Install the main pipe-retrieval device at the exit of the pipe jacking working shaft, and set up an auxiliary pipe-retrieval device;

[0008] Step S3: Set the overall pipe withdrawal strategy and the segmented pipe withdrawal strategy, and select the pipe withdrawal strategy based on the preset jacking force limit; if the overall pipe withdrawal strategy is selected, only the main pipe withdrawal device is used for pipe jacking and withdrawal; if the segmented pipe withdrawal strategy is selected, both the main pipe withdrawal device and the auxiliary pipe withdrawal device are needed for pipe jacking and withdrawal.

[0009] Step S4: During the process of retracting the connecting jacking pipe using the overall pipe retraction strategy or the segmented pipe retraction strategy, adjust the included angle between the relays at the head to make it straight.

[0010] Preferably, the intermediate stations between adjacent jacking pipes are connected to form a connecting jacking pipe, including:

[0011] The intermediate stations located at the head are hinged using precision-rolled threads. The other intermediate stations, excluding those located at the head, are fixedly connected using different numbers of steel plates to form a connecting jacking pipe. The number of precision-rolled threads required between the intermediate stations located at the head and the number of steel plates required between the other intermediate stations, excluding those located at the head, are determined based on the tensile force that each intermediate station needs to withstand.

[0012] Preferably, a main pipe-retreating device is installed at the exit of the pipe-jacking shaft, comprising:

[0013] The main pipe-retreating device includes a backrest, a reaction frame, a main jack support, and a main jack. The backrest is built at the exit of the jacking shaft and is divided into front and rear parts. The water-stop ring at the exit is made of concrete, and a portal steel frame structure is used within the range from the water-stop ring to the main jack. The reaction frame is welded to the jacking pipe, and the main jack pushes the reaction frame to retreat the jacking pipe. The main jack support is located on both sides of the jacking pipe and is used to install the main jack.

[0014] Preferably, an overall exit strategy and a segmented exit strategy are set, including:

[0015] The overall pipe removal strategy involves using a main pipe removal device to remove the connecting jacking pipe as a whole.

[0016] The segmented pipe removal strategy involves dividing the connecting jacking pipe into two segments for pipe removal.

[0017] Preferably, if the overall pipe withdrawal strategy is selected, then only the main pipe withdrawal device is used for pipe withdrawal, including:

[0018] If the maximum jacking force of the main jack is less than or equal to the preset jacking force limit, and the connecting jacking pipe is pulled, then the overall pipe withdrawal strategy is selected to withdraw the jacking pipe; and only the main pipe withdrawal device is used to withdraw the connecting jacking pipe as a whole.

[0019] Preferably, the auxiliary tube retraction device includes:

[0020] The auxiliary pipe-pull device consists of at least two double-ear telescopic jacks. The double-ear jacks are installed on a special flange, with a total of two reinforcing plates on one side. Behind them is a triangular stiffening plate. One end of each double-ear jack is fixed at the intermediate station, and the other end is welded to the jacking pipe.

[0021] Preferably, if a segmented pipe removal strategy is selected, the pipe removal process requires the use of the main pipe removal device and the auxiliary pipe removal device, including:

[0022] If the maximum jacking force of the main jack exceeds the preset jacking force limit and the connecting jacking pipe is not pulled, then the segmented pipe withdrawal strategy is selected; when selecting the segmented pipe withdrawal strategy, the segmented position is one of the relay rooms from the second closest relay room to the machine head to the relay room in the middle, which is denoted as the segmented relay room; the steel plates connecting the segmented relay rooms are released, and an auxiliary pipe withdrawal device is arranged in the segmented relay room;

[0023] Using the main pipe-retreating device and the auxiliary pipe-retreating device installed at the segment relay station, the jacking pipe from the segment relay station to the working shaft outlet section is pulled out a preset distance, while ensuring that the extension of the main jack in the main pipe-retreating device remains unchanged. Using the double-ear jack in the auxiliary pipe-retreating device installed at the segment relay station, the jacking pipe from the segment relay station to the machine head is pulled back until the preset distance is reached. The jacking pipe from the segment relay station to the working shaft outlet section is pulled back repeatedly, and then the jacking pipe from the segment relay station to the machine head is pulled back, pushing the jacking pipe outward.

[0024] Preferably, adjusting the angle between the relays located in the head to bring them back to center includes:

[0025] During the pipe jacking process, the precision-rolled threaded steel bars in the intermediate section at the head are tightened, and the included angle of the intermediate section at the head is adjusted so that the intermediate section at the head gradually returns to the correct position.

[0026] Preferably, the process of removing the connecting jacking pipe using an overall pipe removal strategy or a segmented pipe removal strategy further includes:

[0027] The machine head is synchronously filled with mixed mud using independent grouting pipes; the intermediate station is grouted using independent grouting pipes; and the jacking pipe is supplemented with grout using independent grouting pipes.

[0028] The embodiments of the present invention have at least the following beneficial effects: The present invention connects the intermediate stations between adjacent jacking pipes to form a connected jacking pipe, which can prevent the rotation of the jacking pipe during pipe withdrawal and reduce the impact of rotation on the jacking pipe. At the same time, an overall withdrawal strategy is also formulated, which, combined with the connected jacking pipes, facilitates the overall withdrawal of the connected jacking pipe and reduces the complexity of construction. Furthermore, a main withdrawal device and an auxiliary withdrawal device are set up so that when the overall withdrawal strategy is not applicable, the auxiliary withdrawal device can be used in conjunction with a segmented withdrawal strategy to withdraw the jacking pipe, so that the withdrawal of the jacking pipe can be carried out smoothly. Then, during the withdrawal of the connected jacking pipe using the overall withdrawal strategy or the segmented withdrawal strategy, the included angle of the intermediate station at the head is adjusted to make it return to the correct position, which can make the machine head at the head return to the correct position smoothly and ensure the smooth construction. Attached Figure Description

[0029] To more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 A flowchart illustrating a method for correcting pipe pullback in a jacking pipeline, as provided in an embodiment of the present invention.

[0031] Figure 2 A diagram showing the location distribution of relay stations in a pipe jacking pipeline withdrawal and correction construction method provided in an embodiment of the present invention;

[0032] Figure 3 A backrest effect diagram of a pipe jacking pipe retraction and correction construction method provided in an embodiment of the present invention;

[0033] Figure 4 A backrest plan view of a pipe jacking and pipe retraction correction construction method provided in an embodiment of the present invention;

[0034] Figure 5 This is a reaction frame effect diagram of a pipe jacking and pipe retraction correction construction method provided in an embodiment of the present invention;

[0035] Figure 6 A side view of the main jack support for pipe jacking and pipe pullback correction construction prevention provided in an embodiment of the present invention; Detailed Implementation

[0036] To further illustrate the technical means and effects adopted by the present invention to achieve its intended purpose, the following, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation, structure, features, and effects of a pipe jacking and pipe retraction correction construction method proposed according to the present invention. In the following description, different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0038] The following describes in detail, with reference to the accompanying drawings, a specific scheme for the pipe jacking pipeline withdrawal and correction construction method provided by the present invention.

[0039] Example:

[0040] The main application scenario of this invention is as follows: During the pipe jacking process, due to problems such as improper construction technology, construction environment, and construction operation, the position of the pipe jacking machine head may fluctuate significantly, causing deviations in the jacking path of the head pipe. This will affect the subsequent pipe jacking construction. If it is not corrected, the jacking of the pipe will continue to deviate, and the error will become larger and larger. This will not only cause economic losses, but may even cause safety problems in severe cases. Therefore, it is necessary to correct the deviation of the jacking path of the head pipe.

[0041] Please see Figure 1 The diagram illustrates a method flowchart for a pipe jacking and pipe withdrawal correction construction method provided by an embodiment of the present invention. The method includes the following steps:

[0042] Step S1: Connect the intermediate stations between adjacent jacking pipes to form a connecting jacking pipe.

[0043] During the pipe jacking construction process, the position of the jacking head may fluctuate due to construction technology or environmental factors, causing deviation. If jacking construction continues, the deviation will become larger and larger. Therefore, it is necessary to correct the deviation of the jacking head to ensure that subsequent pipe jacking can proceed normally.

[0044] During the pipe retraction process, the jacking pipe needs to be pulled backward. However, the jacking pipe may rotate during this process, and the intermediate station and tail section are also prone to being pulled apart, affecting the pipe retraction work. Therefore, it is necessary to connect and fix the intermediate station and tail section into a whole. At the same time, when fixing each section of the jacking pipe, it is also necessary to consider the forces borne by each section to prevent damage to the fixing device between the jacking pipes during the pulling process, which would affect the pipe retraction.

[0045] In one embodiment of the present invention, the location distribution diagram between relay stations is as follows: Figure 2 As shown, taking 6 relay stations as an example, each relay station needs to be connected; except for the relay station located at the head, that is, relay station 1, the other relay stations are fixedly connected by steel plates. That is, the connection and fixation are made by steel plates. However, the connection and fixation between relay station 1 and the machine head is made by precision rolled thread hinge. This is because relay station 1 needs to be reset, so it cannot be fixed.

[0046] Meanwhile, when connecting the relay stations, it is necessary to consider the magnitude of the tensile force they can withstand. For relay station #1, its tensile force needs to be calculated, and then the number of fine-rolled threads needs to be determined based on its tensile force. For relay stations #2, #3, #4, #5 and #6, their tensile forces need to be calculated, and then the number of steel plates required for consolidation of each relay station needs to be calculated based on the tensile force.

[0047] It should be noted that the required tensile force between relay stations is mainly determined by the frictional resistance between the pipe wall and the soil, the distance from the relay station to the jacking head, and the outer diameter of the jacking pipe. Therefore, the required tensile force for each relay station can be calculated based on the distance from each relay station to the jacking head, the outer diameter of the jacking pipe, and the average frictional resistance per unit area between the outer wall of the jacking pipe and the soil. Furthermore, the number of steel plates between relay stations gradually decreases from relay station #6 to relay station #2. This allows the relay stations between adjacent jacking pipes to be connected, forming a connected jacking pipe system.

[0048] Step S2: Install the main pipe withdrawal device at the exit of the pipe jacking working shaft and set up an auxiliary pipe withdrawal device.

[0049] In order to successfully pull out the jacking pipe, a main pipe-retrieval device and an auxiliary pipe-retrieval device need to be established for the pipe-retrieval of the jacking pipe.

[0050] The main pipe-retreating device mainly includes a backrest, reaction frame, main jack support, and main jack. The newly built backrest is constructed at the exit of the pipe-jacking working shaft. The backrest completely wraps around the pipe, and its thickness, width, and height need to be set in advance according to the actual situation. A whole steel plate is installed at the contact point between the front of the backrest and the main jack. The inner side of the steel plate is arc-shaped, and its thickness is determined by the actual situation. The backrest is divided into front and rear parts. The water-stop ring at the opening is a concrete structure. A portal steel frame structure is used within the range from the water-stop ring at the opening to the main jack. A 25mm thick rubber plate is used to isolate the concrete from the steel pipe. The water-stop ring at the opening is located in the middle of the backrest and is completely wrapped with concrete. The backrest concrete section uses C35 concrete and is reinforced with double-layer, two-way steel bars. The steel frame legs and jack bearing surfaces use 3-section 45a I-beams; the reinforcing diagonal braces use 2-section 45a I-beams; the reinforcing columns use 45a I-beams; three additional ribs should be added at the locations of the legs and reinforcing I-beams, and at the ends of the legs; triangular wing plates should be added for reinforcement at corner points; a steel plate should be added between the steel frame and the jack support to distribute the jacking force to each I-beam; the tail of the legs rests on 6-section 20a type I-beams arranged in a diamond pattern; see details below. Figure 3 and Figure 4 .

[0051] The backrest is designed as a portal steel structure instead of a full concrete structure. This is to expose the waterstop ring at the opening, allowing for the injection of bentonite for lubrication during pipe retraction; and to facilitate repair of the exposed waterstop ring should it be damaged. Additionally, it should be noted that the strength of the steel frame used in the backrest construction was calculated to ensure it met requirements.

[0052] Furthermore, a reaction frame needs to be welded onto the jacking pipe for pipe retraction. This involves welding a box-type ring plate to the outer wall of the steel pipe, with ribs welded inside the ring plate; and reinforcing it with a triangular flange plate welded to the back. The internal structure of the reaction frame is as follows: two ring flanges are welded to the inner wall of the steel pipe, with a cross-shaped rib plate in the middle of the flanges to support the steel pipe; the triangular plates and circumferential steel plates of the reaction frame are fully welded. Its specific structure is as follows... Figure 5 As shown.

[0053] Simultaneously, a main jack support system needs to be fabricated. This support system, used to house the jacks, is located on both sides of the jacking pipe. It utilizes 20A I-beams as inner and outer columns, arranged in two rows of three. Square steel is used as crossbars, with four layers of crossbars. The spacing between the layers needs to be determined based on the actual situation. This system is used to house the main jacks. (Specific details are as follows...) Figure 6 As shown.

[0054] The backrest, reaction frame, main jack support, and jack together form the main pipe-removal device, used for the removal of pipes from jacking pipelines.

[0055] During pipe withdrawal, if the main withdrawal device is insufficient to pull out the jacking pipe, a new withdrawal strategy needs to be developed. This requires the installation of an auxiliary withdrawal device. The auxiliary withdrawal device is installed in one of the following locations: relay rooms #2, #3, or #4. However, not every relay room needs an auxiliary withdrawal device; installation depends on the established withdrawal strategy. The auxiliary withdrawal device consists of six double-ear telescopic jacks, each mounted on a specially designed flange. Two reinforcing plates are mounted on each side, followed by triangular stiffening plates. During installation, one end of each double-ear jack is fixed to the relay room, and the other end is welded to the jacking pipe. At this point, both the main and auxiliary withdrawal devices can be installed.

[0056] Step S3: Set the overall pipe withdrawal strategy and the segmented pipe withdrawal strategy, and select the pipe withdrawal strategy based on the preset jacking force limit; if the overall pipe withdrawal strategy is selected, only the main pipe withdrawal device is used for pipe withdrawal; if the segmented pipe withdrawal strategy is selected, both the main pipe withdrawal device and the auxiliary pipe withdrawal device are needed for pipe withdrawal.

[0057] To facilitate the removal of the jacking pipe, this invention provides two removal strategies: an overall removal strategy and a segmented removal strategy. The overall removal strategy involves removing the fixed jacking pipe as a whole, while the segmented removal strategy involves dividing the fixed jacking pipe into two segments before removal. The location of the segments needs to be determined based on the actual situation.

[0058] Specifically, during pipe removal, all connected jacking pipes can be pulled out as a whole. This depends on whether the maximum jacking force of the main jack exceeds the preset jacking force limit. If it exceeds the preset jacking force limit, the connected jacking pipes after being fixed will not be pulled out, indicating that the overall pipe removal strategy is not advisable. If the jacking force of the main jack is less than the preset jacking force limit, the connected jacking pipes after being fixed will be pulled out, indicating that the overall pipe removal strategy can be used directly to pull out the jacking pipes. When using the overall pipe removal strategy, only the main pipe removal device is needed. Then, based on the reaction frame welded to the jacking pipe, the main jack in the main pipe removal device pushes the reaction frame to remove the entire jacking pipe.

[0059] If the overall pipe removal strategy cannot remove the fixed pipe as a whole, a segmented pipe removal strategy is required. When using the segmented pipe removal strategy, the location of the segment needs to be determined. The segment location is one of the relay rooms between the second closest to the machine head and the middle relay room, denoted as the segmented relay room. Taking the six relay rooms in this embodiment as an example, when using the segmented pipe removal strategy, the segment location is one of relay rooms #2, #3, or #4. This is determined based on the number of relay rooms remaining excluding the one at the head. For example, if the number of relay rooms other than the one at the head is odd, then the middle relay room is chosen as the segment location. The middle relay room serves as the dividing line. One of the relay rooms in the front half can be used to install the auxiliary pipe withdrawal device. The location for installing the auxiliary pipe withdrawal device is also the segmentation point, and the specific location needs to be determined based on the actual situation. If the number of remaining relay rooms is even, the relay room closer to the machine head among the two middle relay rooms is used as the dividing line. One of the relay rooms in the front half can be used to install the auxiliary pipe withdrawal device. For example, if the number of remaining relay rooms is 6, the third relay room is used as the dividing line, and one of the first, second, and third relay rooms can be used to install the auxiliary pipe withdrawal device.

[0060] In this embodiment of the invention, when adopting a segmented pipe withdrawal strategy, an auxiliary pipe withdrawal device is first installed in the No. 2 relay room. At this time, the No. 2 relay room is a segmented relay room. The temporary steel plates that are fixed between the No. 2 relay rooms are released. At the same time, the main pipe withdrawal device and the auxiliary pipe withdrawal device installed in the No. 2 relay room are used to pull the jacking pipe from the No. 2 relay room to the outlet of the working well out a preset distance. Meanwhile, the extension of the main jack in the main pipe withdrawal device remains unchanged. The double-ear jack in the auxiliary pipe withdrawal device installed in the No. 2 relay room is used to pull back the jacking pipe from the No. 2 relay room to the machine head until the preset distance is reached, that is, the gap in the No. 2 relay room is tightened. The above work is repeated to push the jacking pipe outward.

[0061] Additionally, it should be noted that if the No. 2 relay room is disconnected, and the jacking pipe section from the No. 2 relay room to the working shaft outlet cannot be pulled, then the No. 2 relay room needs to be re-consolidated, and the consolidation between the No. 3 relay rooms needs to be disconnected. At this time, the No. 3 relay room is a segmented relay room. Then, the pipe pulling operation when disconnecting the No. 2 relay room is repeated to perform pipe pulling. The reason for selecting only one of the relay rooms in the first half to install the auxiliary pipe pulling device is that the function of the relay rooms in the first half and the relay rooms in the second half is the same, similar to a mirror image. For example, in this embodiment of the invention, if the No. 2 relay room and the No. 6 relay room are selected, the length of the jacking pipe pulled during pipe pulling is approximately the same.

[0062] Simultaneously, regardless of whether a whole-section or segmented pipe-retraction strategy is used, three independent grouting pipes need to be set up during pipe retraction. The first grouting pipe is for the jacking head, the second for the intermediate stations, and the third for the jacking pipe and the water-stop ring at the tunnel entrance. The first grouting involves simultaneously blowing mixed mud into the jacking head through the mud inlet pipe during pipe retraction to ensure timely backfilling of the cavity in front of the jacking head; the retraction speed must be controlled to maintain the pressure in the jacking head's mud chamber. The second grouting involves filling the intermediate station gaps with grout before pipe retraction to reduce sand entry during the retraction process. The third grouting involves continuously replenishing the pipe wall with grout during pipe retraction to reduce friction; bentonite grout should also be injected into the double-layer water-stop ring at the tunnel entrance for lubrication to reduce the impact of the rubber plate on pipe retraction. Meanwhile, when the jacking pipe is pulled out, it needs to be cut and then lifted out of the working shaft to prevent the jacking pipe from being too long and affecting the subsequent pipe withdrawal. After the pipe is cut, it needs to be beveled on site, and the reaction frame is welded to the existing pipe using CO2 gas shielded welding before the pipe withdrawal work is carried out. During the cutting, it is necessary to ensure that the withdrawn jacking pipe reaches the preset length.

[0063] Step S4: During the process of retracting the connecting jacking pipe using the overall pipe retraction strategy or the segmented pipe retraction strategy, adjust the included angle between the relays at the head to make it straight.

[0064] The purpose of retracting the pipe in a jacking pipeline is to correct deviations that occur during the jacking process. Therefore, continuous measurements are required during the retraction process, monitoring not only the length of the retracted pipe but also changes in deviation. During the pipe retraction process, the threaded steel bars of the No. 1 intermediate station are continuously tightened to gradually straighten the No. 1 intermediate station. This tightening of the threaded steel bars of the intermediate station at the head of the jacking pipeline helps adjust the angle of the intermediate station at the head, allowing the jacking head to gradually straighten. Preferably, when the pipe and axis within 3 meters before and after the No. 1 intermediate station are within the deviation range, the pipe retraction work can be stopped, thus achieving the purpose of correction. Furthermore, after the angle of the No. 1 intermediate station is straightened, the No. 1 intermediate station should be locked and not allowed to move.

[0065] Finally, when the axis of the machine head and the No. 1 relay room are within the deviation range, a re-measurement is carried out to ensure that the axis deviation meets the requirements. Then, the same consolidation method as other relay rooms is adopted, and steel plates are used to connect and consolidate the No. 1 relay room to prevent deviation or bend during the re-jacking process. At the same time, the jacking speed should be reduced during the re-jacking process to prevent deviation from occurring again.

[0066] It should be noted that regardless of whether a whole-section or segmented pipe-retraction strategy is used, three independent grouting pipes need to be set up during pipe retraction. The first grouting pipe is for the jacking head, the second for the intermediate stations, and the third for the jacking pipe and the water-stop ring at the tunnel entrance. The first grouting involves simultaneously blowing mixed mud into the jacking head through the mud inlet pipe during pipe retraction to ensure timely backfilling of the cavity in front of the jacking head; the retraction speed must be controlled to maintain the pressure in the jacking head's mud chamber. The second grouting involves filling the intermediate station gaps with grout before pipe retraction to reduce sand entry during the retraction process. The third grouting involves continuously replenishing the pipe wall with grout during pipe retraction to reduce friction; bentonite grout should also be injected into the double-layer water-stop ring at the tunnel entrance for lubrication to reduce the impact of the rubber plate on pipe retraction. Meanwhile, when the jacking pipe is pulled out, it needs to be cut and then lifted out of the working shaft to prevent the jacking pipe from being too long and affecting the subsequent pipe withdrawal. After the pipe is cut, it needs to be beveled on site, and the reaction frame is welded to the existing pipe using CO2 gas shielded welding before the pipe withdrawal work is carried out. During the cutting, it is necessary to ensure that the withdrawn jacking pipe reaches the preset length.

[0067] It should be noted that the order of the above embodiments of the present invention is merely for descriptive purposes and does not represent the superiority or inferiority of the embodiments. Furthermore, the above description focuses on specific embodiments of this specification. Additionally, the processes depicted in the accompanying drawings do not necessarily require a specific or sequential order to achieve the desired results. In some embodiments, multitasking and parallel processing are possible or may be advantageous.

[0068] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0069] The above description is only 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 should be included within the protection scope of the present invention.

Claims

1. A pipe-retrieving and correcting construction method for a pipe conduit, characterized by, The method comprises: Step S1, connecting the relay stations in the middle of each adjacent pipe to form a connecting pipe; Step S2, installing a main pipe pulling device at the pipe working shaft exit and setting an auxiliary pipe pulling device; the auxiliary pipe pulling device is composed of at least two double-ear jacks, one end of which is fixed at the relay station and the other end is welded to the pipe; Step S3, setting an overall pipe pulling strategy and a segmented pipe pulling strategy, and selecting a pipe pulling strategy based on a preset jacking force limit; if the overall pipe pulling strategy is selected, only the main pipe pulling device is used for pipe pulling; if the segmented pipe pulling strategy is selected, the main pipe pulling device and the auxiliary pipe pulling device are used for pipe pulling; Step S4, adjusting the included angle of the relay station at the head to make it return to normal during the pipe pulling process of the connecting pipe using the overall pipe pulling strategy or the segmented pipe pulling strategy.

2. The pipe-retrieving and correcting construction method of a pipe pushing according to claim 1, characterized in that, The connecting pipe is formed by connecting the relay stations in the middle of each adjacent pipe, which comprises: The relay stations at the head are hinged by using fine rolling threads, and the other relay stations are fixedly connected by using different numbers of steel plates to form a connecting pipe; the number of fine rolling threads required between the relay stations at the head and the number of steel plates required between the other relay stations are determined according to the pulling force required to be borne between each relay station.

3. The pipe-retrieving and correcting construction method of a pipe conduit according to claim 1, characterized in that, The main pipe pulling device is installed at the pipe working shaft exit, which comprises: The main pipe pulling device comprises a backrest, a counterforce frame, a main jack support and a main jack; the backrest is established at the pipe working shaft exit and is divided into two parts, the hole sealing ring is a concrete structure, and a portal steel frame structure is used within the range from the hole sealing ring to the main jack; the counterforce frame is welded to the pipe, the main jack pushes the counterforce frame to pull the pipe, and the main jack support is located on both sides of the pipe to install the main jack.

4. The pipe-retrieving and correcting construction method of a pipe pushing according to claim 1, characterized in that, The overall pipe pulling strategy is to use the main pipe pulling device to pull the connecting pipe as a whole, and the segmented pipe pulling strategy is to divide the connecting pipe into two segments for pipe pulling. If the maximum jacking force of the main jack is less than or equal to the preset jacking force limit, the connecting pipe is pulled, the overall pipe pulling strategy is selected for pipe pulling, and only the main pipe pulling device is used to pull the connecting pipe as a whole.

6. The pipe pulling and correction construction method of the pipe according to claim 1, wherein the double-ear jack is installed on a special flange, and the reinforcing plate has a total of two single-sided blocks; and a triangular stiffener plate is provided behind the double-ear jack.

5. The pipe-retrieving and correcting construction method of a pipe pushing according to claim 1, characterized in that, If the maximum jacking force of the main jack is less than or equal to the preset jacking force limit, the connecting pipe is pulled, the overall pipe pulling strategy is selected for pipe pulling, and only the main pipe pulling device is used to pull the connecting pipe as a whole. ​ ​ ​ 7. The pipe-retrieving and correcting construction method of a pipe pushing according to claim 1 or 6, characterized in that, ​ If the maximum jacking force of the main jack is greater than the preset jacking force limit value, and the connecting jacking pipe is not pulled, a segmented pipe withdrawing strategy is selected; when the segmented pipe withdrawing strategy is selected, the segmented position is one of the second closest relay interval to the machine head to the relay interval in the middle, denoted as the segmented relay interval; the steel plates connected between the segmented relay intervals are removed, and an auxiliary pipe withdrawing device is arranged at the segmented relay interval; The main pipe withdrawing device and the auxiliary pipe withdrawing device installed at the segmented relay interval are used to pull the jacking pipe from the segmented relay interval to the outlet section of the working well by a preset distance, and the elongation of the main jack in the main pipe withdrawing device is kept unchanged, the double-ear jack in the auxiliary pipe withdrawing device installed at the segmented relay interval is used to pull back the jacking pipe from the segmented relay interval to the machine head until a preset distance is reached; the jacking pipe from the segmented relay interval to the outlet section of the working well is repeatedly pulled, and the jacking pipe from the segmented relay interval to the machine head is pulled back again, and the jacking pipe is externally jacked.

8. The pipe jacking pipe withdrawing and correcting construction method according to claim 1, characterized in that, The included angle of the relay interval at the head is adjusted to be righted, comprising: During the process of pipe withdrawing, the high-strength deformed steel bars in the relay interval at the head are fastened, and the included angle of the relay interval at the head is adjusted to gradually right the relay interval at the head.

9. The pipe jacking method of claim 1, wherein, During the process of pipe withdrawing of the connecting jacking pipe by using the whole pipe withdrawing strategy or the segmented pipe withdrawing strategy, the method further comprises: Synchronous filling mixed mud is blown to the machine head by using an independent grouting pipe; grouting is performed on the relay interval by using an independent grouting pipe; and grouting is performed on the jacking pipe by using an independent grouting pipe.

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