Movable advanced protection device for manual pipe jacking under condition of sudden change of soft and hard soil layers of stratum and rapid lifting method

Abstract

The invention discloses a movable advanced protection device for manual pipe jacking under the condition of sudden change of soft and hard soil layers of a stratum and a rapid lifting method, and relates to the field of manual pipe jacking engineering construction. The device comprises a main body supporting assembly, an advanced soil cutting protection assembly, a moving assembly and a lifting deviation rectifying assembly. The main body supporting assembly comprises a plurality of groups of main frame bodies and adjustable supporting pieces and is adaptive to different pipe diameters; the advanced soil cutting protection assembly uses a first jack to push an arc-shaped steel plate to cut soil, and a directional structure is used for preventing deviation; the moving assembly drives the device to move; and the lifting deviation rectifying assembly is matched with the second jack through the I-shaped steel to bear the lifting force. According to the method, through device fixing, soil cutting protection and dynamic movement, a second jack and a third jack of a working well cooperatively exert force, and pipeline lifting deviation correction is achieved. According to the method, the problems of multi-pipe-diameter adaptation and pipeline sinking deviation correction under the condition of sudden change of soft and hard soil layers of the stratum are solved, and the construction safety and efficiency are improved.

Description

Technical Field

[0001] This invention relates to the field of artificial pipe jacking construction technology, and more specifically, to a movable advanced protection device and rapid lifting method for artificial pipe jacking in the event of abrupt changes in the soft and hard soil layers. Background Technology

[0002] In the field of manual pipe jacking construction, when the jacking route is below the groundwater level and encounters abrupt changes in the strata from hard soil layers to soft soil layers, existing technical solutions struggle to balance construction safety, efficiency, and pipeline precision control, exhibiting the following specific shortcomings:

[0003] Firstly, existing front-end protection devices lack flexibility and adaptability. For example, in the patent application number 202121459901.9 entitled "A Front-End Protection Device for Manual Pipe Jacking," the device can only be pre-installed in front of the pipeline and is fixed and immovable. If the device malfunctions during construction and needs to be removed for repair, it is difficult to operate and cannot adapt to the construction needs of various pipe diameters in the project. The device needs to be repeatedly manufactured for different pipe diameters, which increases the construction cost. At the same time, if the initial stratum conditions are good and the device is not installed, when encountering weak soil layers during subsequent jacking and needing to temporarily add protection, the immovable device cannot be applied in time, making it difficult to cope with sudden changes in stratum conditions.

[0004] Secondly, existing devices have low soil cutting efficiency and poor protective reliability. For example, in the patent application number 202320979786.0 entitled "A Protective Device for the Front End of Manual Pipe Jacking", the arc-shaped protective cover can only be embedded by squeezing the soil in front of it with its own weight or manual pushing force. When facing hard soil layers, the advancing efficiency drops significantly, which cannot meet the needs of rapid construction. Moreover, the device does not have a lower support structure. When the arc-shaped protective cover pushes out the soil and excavates the soil below before the pipe, the protective cover has to bear the weight of the soil above. Relying solely on the rivet connection with the pipe wall, the structure is prone to instability, posing a safety hazard to the operation and failing to provide a stable protective space for construction personnel.

[0005] Third, the lack of pipeline sinking correction capability is a core shortcoming of existing technology. When the jacking line is below the groundwater level and encounters abrupt changes in strata between hard and soft soil layers, the pipeline is prone to sinking (head-down) when it enters the soft soil layer during the jacking process due to insufficient soil bearing capacity. Conventional correction methods (such as manual excavation before the pipe or support before the pipe) require sufficient support from the soil ahead to achieve effective correction. Soft soil layers cannot meet this bearing capacity requirement, making correction operations difficult to implement. At the same time, some existing devices, because they are fixed to the front end of the pipeline, increase the weight of the first section of the pipeline, further exacerbating the sinking trend and forming a vicious cycle of "sinking-difficult correction," which seriously affects the axial accuracy and project quality of pipe jacking construction.

[0006] In addition, the existing technologies generally lack the collaborative design of the equipment supporting the working shaft, and cannot form an integrated solution of "advanced protection - dynamic movement - precise deviation correction". During the construction process, it is necessary to frequently switch equipment or adjust processes, which not only reduces the construction efficiency, but also easily causes safety risks due to problems in process connection, and it is difficult to meet the actual needs of efficient, safe and precise construction of the artificial pipe jacking project under complex strata. Summary of the Invention

[0007] The present invention provides a movable advanced protection device and a rapid lifting method for artificial pipe jacking under the condition of sudden change of hard and soft soil layers in the formation, so as to solve the technical problems that the front protection device of traditional artificial pipe jacking lacks flexibility, can only be pre-installed, cannot move and is difficult to repair in case of failure, and is difficult to cope with sudden changes in the formation; has poor adaptability and cannot be compatible with the construction requirements of multiple pipe diameters; has low soil cutting efficiency, is difficult to advance in hard soil layers, and the protection structure lacks effective support and has insufficient reliability; lacks the ability to correct the deviation of pipe sinking, the bearing capacity of soft soil layers is insufficient, resulting in the failure of conventional deviation correction methods, and some devices will even exacerbate the pipe sinking; at the same time, it lacks the collaborative design with the equipment supporting the working shaft, and it is difficult to form an integrated solution of "protection - movement - deviation correction", affecting the construction efficiency and accuracy.

[0008] To achieve the above object, the present invention provides a movable advanced protection device for artificial pipe jacking under the condition of sudden change of hard and soft soil layers in the formation, including:

[0009] A main body support component, which is used to adapt to pipe jacking pipes of different pipe diameters and provide overall structural support; an advanced soil cutting and protection component, assembled at the front end of the main body support component, which is used to actively cut into the front soil body and form an advanced protection space;

[0010] A moving component, arranged at the bottom of the main body support component, which is used to drive the device to move along the axis of the pipe jacking pipe;

[0011] A lifting and deviation correction component, connected to the main body support component, which is used to receive the lifting force to achieve the deviation correction after the pipe jacking pipe sinks;

[0012] The main body support component cooperates with the advanced soil cutting and protection component, the moving component and the lifting and deviation correction component respectively, and can realize the dynamic advanced protection of pipe jacking construction and the active lifting and deviation correction after the pipe sinks under the condition that the formation suddenly changes from hard soil to soft soil below the groundwater level, and can cooperate with the third jack at the working shaft to form a collaborative jacking force.

[0013] Furthermore, the main support assembly includes at least a first main frame, a second main frame, and a third main frame; the first main frame, the second main frame, and the third main frame are arranged sequentially at intervals along the length of the jacking pipe, and the three are fixedly connected to form an integral load-bearing structure; each main frame is provided with adjustable support members that extend and retract toward the jacking pipe wall at the top, side, and bottom positions, and the extension and retraction between the adjustable support members and the main frame can adapt to jacking pipes with different inner diameters.

[0014] Furthermore, the advanced soil cutting protection component includes a first jack, an arc-shaped steel plate, and a directional structure; one end of the first jack is fixed to the third main frame of the main support component, and the other end is connected to the arc-shaped steel plate to push the arc-shaped steel plate forward into the soil along the axis of the jacking pipe; the side of the arc-shaped steel plate facing the soil is provided with a cutting edge structure, and the curvature of the arc-shaped steel plate is adapted to the curvature of the inner wall of the jacking pipe; the directional structure includes a guide rail fixed to the inner wall of the jacking pipe, and a slider fixed to the arc-shaped steel plate and slidable along the guide rail, the movement direction of the arc-shaped steel plate is restricted by the cooperation of the guide rail and the slider.

[0015] Furthermore, the lifting and correction component includes an I-beam, which is fixedly connected to the main support component to form a lifting force carrier. When the jacking pipe sinks, the I-beam can cooperate with the cushion layer formed by the broken pipe section inside the jacking pipe. By setting a second jack on the cushion layer and lifting the I-beam, the lifting force is transmitted to the main support component, thereby realizing the pipe correction.

[0016] Furthermore, the mobile component comprises at least two tank-like vehicles. These vehicles are fixed to the bottom of the main support component, and their direction of travel is aligned with the axis of the jacking pipe, enabling the device to move along the jacking pipe axis to the next construction position. A pad is laid at the bottom of the inner wall of the jacking pipe, and a sand cushion layer is provided below the pad, forming the foundation for the mobile component's movement.

[0017] Furthermore, the guide rail is uniformly fixed along the circumference of the inner wall of the jacking pipe, and the guide rail has a slotted structure; the shape of the slider is adapted to the slotted structure, and the slider can slide stably along the guide rail after being embedded in the slot, thus avoiding deviation when the arc-shaped steel plate cuts the soil.

[0018] Furthermore, the adjustable support includes a support leg and a support bracket. The support leg is slidably connected to the main frame, and the support bracket is fixed to the end of the support leg facing the pipe wall of the jacking pipe. Holes are opened at intervals along the length direction on both the support leg and the main frame of the adjustable support. By inserting a connector into different holes, the extension and retraction of the adjustable support can be adjusted to further adapt to the construction needs of jacking pipes with different diameters.

[0019] This invention also provides a method for rapid lifting of artificial pipe jacking in the event of abrupt changes in the hardness of soil layers, comprising the following steps:

[0020] S1: Move the movable advanced protection device into the jacking pipe, adjust the adjustable support parts on each main frame of the main support assembly so that the adjustable support parts are pressed against the jacking pipe wall, and complete the fixing of the movable advanced protection device.

[0021] S2: Activate the first jack of the advanced soil cutting protection component to push the arc-shaped steel plate along the guide rail to cut into the soil in front. The workers excavate the soil within the protective space formed by the arc-shaped steel plate.

[0022] S3: After the arc-shaped steel plate cuts into the preset distance, the adjustable support components are retracted, and the movable advanced protection device is moved along the axis of the jacking pipe to the next construction position through the moving components. Steps S1-S2 are repeated to achieve dynamic advanced protection.

[0023] S4: If the jacking pipe sinks, the pipe section at the front end of the section to be broken is broken, removed, grouted, and reinforced to form a cushion layer. The second jack is installed on the cushion layer to tighten the I-beam of the lifting and correction component. At the same time, the third jack at the working well is started to exert force forward. Combined with the monitoring equipment to check the pipe elevation, the pipe lifting and correction is completed. The third jack is located in the working well near the intact pipe side, and the force output direction is forward along the axis of the jacking pipe.

[0024] Furthermore, the first jack of the pre-cutting protection assembly is activated, pushing the arc-shaped steel plate along the guide rail to cut into the soil in front. Workers excavate the soil within the protective space formed by the arc-shaped steel plate, specifically including:

[0025] S21: Determine the single cutting distance of the arc-shaped steel plate based on the inner diameter of the jacking pipe and the hardness of the soil in front, to ensure that the workers have a safe excavation space;

[0026] S22: Start the first jack and control the first jack to push the arc-shaped steel plate along the guide rail towards the soil until the arc-shaped steel plate cuts into the preset distance;

[0027] S23: Workers enter the enclosed protective space formed by the curved steel plate, excavate the soil in a preset sequence, and transport the excavated soil to the working well and then transport it out.

[0028] Furthermore, if the jacking pipeline sinks, the pipe section at the foremost point to be broken is crushed and compacted into a cushion layer. A second jack is installed on the cushion layer to tighten the I-beams of the lifting and correction assembly. Simultaneously, the third jack at the working shaft is activated to exert force forward. Combined with monitoring equipment to verify the pipeline elevation, the pipeline lifting and correction is completed. Specifically, this includes:

[0029] S41: Use monitoring equipment to determine the subsidence of the jacking pipe, identify the sections to be broken as the first few pipe sections of the pipe, and mark the breakage boundary;

[0030] S42: Under the protection of the arc-shaped steel plate, the broken pipe fragments are removed from the designated part of the section of pipe to be broken, and then grouting is performed to reinforce the pipe, and the soil is backfilled to form the cushion layer required for the second jack support.

[0031] S43: Install the second jack on the pad layer at the position corresponding to the I-beam, so that the top of the second jack is in contact with the I-beam;

[0032] S44: Simultaneously start the third jack at the working well and the second jack at the cushion layer. The third jack provides the jacking force forward along the axis of the jacking pipe, and the second jack provides the lifting force upward perpendicular to the axis of the jacking pipe.

[0033] S45: The pipeline elevation is checked in real time through monitoring equipment. If the deviation exceeds the requirements of the construction specifications, the output of the second jack is adjusted until the pipeline elevation is restored to the design value.

[0034] This invention, through the coordinated design of the device structure and construction method, achieves dynamic protection, precise deviation correction, multi-diameter adaptation, and efficient operation in manual pipe jacking construction under conditions of abrupt changes in soil layers (soft and hard). Specific beneficial effects are as follows:

[0035] The main support component adopts multiple sets of main frame bodies fixedly connected to form an overall load-bearing structure. With the help of adjustable support components at the top, sides and bottom, the support components can be adjusted by adjusting the extension and contraction of the support components and the angle of the support brackets. It can flexibly adapt to jacking pipes with different inner diameters, eliminating the need to make separate devices for different pipe diameters. This solves the problems of poor adaptability and high repeated investment costs of traditional protective devices. The adjustable support components are fixed to the connectors through holes, making the adjustment operation convenient. After being tightened against the pipe wall, it can provide stable support for the device and prevent the device from shifting during construction and affecting the protective effect.

[0036] The advanced soil cutting protection component uses the first jack as a power source to push the arc-shaped steel plate into the soil. Compared with the traditional manual pushing or self-weight propulsion method, it greatly improves the soil cutting efficiency in hard soil layers and shortens the operation time. The arc-shaped steel plate with a cutting edge structure reduces soil cutting resistance. With the directional constraint of the guide rail and slider, it ensures that the soil cutting direction is along the pipeline axis, avoiding the arc-shaped steel plate from deviating and causing deformation of the protection space. At the same time, the closed protection space formed by the arc-shaped steel plate can effectively isolate the risk of soil collapse in front and ensure the safety of the operators.

[0037] The I-beams of the lifting and correction components are fixed to the main support components to form a load-bearing carrier. When the pipeline sinks, the cushion layer formed by cleaning and grouting after the broken pipe section provides stable support for the second jack. The lifting force is transmitted by tightening the I-beams through the second jack. Combined with the forward pushing force of the third jack at the working well, a synergistic force of "upward lifting + forward pushing" is formed, which solves the problem of the failure of conventional correction methods due to insufficient bearing capacity of soft soil layers. The monitoring equipment verifies the elevation in real time and adjusts the output of the jacks to ensure the accuracy of pipeline lifting and avoid the vicious cycle of "sinking - difficulty in correction".

[0038] The mobile component uses at least two straight tanks fixed to the bottom of the main support component. After the arc-shaped steel plate cuts into the preset distance, the retractable adjustable support can move the device along the pipeline axis by the tanks. There is no need to disassemble and reassemble, which realizes dynamic advanced protection and solves the drawbacks of traditional fixed protection devices that are difficult to repair when they fail and cannot be adjusted in time when the ground changes suddenly. The direction of travel of the tanks is consistent with the pipeline axis, and the movement process is stable, avoiding the device from deviating and affecting subsequent construction.

[0039] The construction method achieves continuous operation of advanced protection through a cyclical process of "fixed device - soil cutting and protection - dynamic movement", reducing the time between processes. When the pipeline sinks and corrects its deviation, the design of the steps of cleaning the front pipe section after crushing, grouting and backfilling the bedding layer, and simultaneously starting the double jacks to work together simplifies the correction operation, eliminates the need for additional auxiliary facilities, and shortens the correction period. In the overall process, the functions of the first jack cutting soil, the second jack lifting, and the third jack advancing are clearly defined. With the precision control of the monitoring equipment, an integrated solution of "protection-movement-correction" is formed.

[0040] In summary, the device and construction method of this invention work together to solve the problems of poor flexibility, low soil cutting efficiency, lack of correction ability, and limited adaptability of traditional manual pipe jacking protection devices. It achieves safe, efficient, and precise control of manual pipe jacking construction under conditions of sudden changes in soft and hard soil layers, and has significant practical value.

[0041] Other features and advantages of the invention will become clear from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings. Attached Figure Description

[0042] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the invention and, together with their description, serve to explain the principles of the invention.

[0043] Figure 1 This is a schematic diagram of a movable advanced protection device for artificial pipe jacking (excluding advanced soil cutting protection components) in the event of abrupt changes in the soil layers of soft and hard soil. Figure 1 ;

[0044] Figure 2This is a schematic diagram of a movable advanced protection device (including advanced soil cutting protection components) for artificial pipe jacking under conditions of abrupt changes in soil hardness. Figure 2 ;

[0045] Figure 3 yes Figure 2 Enlarged view of a portion of point A in the middle;

[0046] Figure 4 This is a schematic diagram of a movable advanced protection device (including advanced soil cutting protection components) for artificial pipe jacking under conditions of abrupt changes in soil hardness. Figure 3 ;

[0047] Figure 5 This is a 3D diagram showing the integration of the advanced soil cutting protection components and the jacking pipe.

[0048] Figure 6 This is a schematic diagram of the cross-section of the advanced soil cutting protection component and the jacking pipe.

[0049] Figure 7 This is a side view of a movable advanced protection device for artificial pipe jacking under conditions of abrupt changes in the soft and hard soil layers.

[0050] Figure 8 It is a side view of the movable advanced protection device for artificial pipe jacking and the conventional operation of the pipe jacking well under the condition of sudden change in soft and hard soil layers;

[0051] Figure 9 This is a side view of the jacking pipe during its sinking process;

[0052] Figure 10 This is a side view of the pipe after it has been lowered and lifted during the jacking process;

[0053] Figure 11 This is a three-dimensional schematic diagram of the jacking pipe sinking process;

[0054] Figure 12 This is a schematic diagram showing the coordination between the protective device and the jacking pipe during the sinking and lifting of the pipe.

[0055] Figure 13 It is a three-dimensional diagram of a multi-layered arc-shaped steel plate structure;

[0056] Figure 14 This is a side view of a multi-layered structure made of curved steel plates.

[0057] Figure label:

[0058] Pipeline 1; Subbase 11; Pad 12; Complete Pipeline Section 13; Sinking Pipeline Section 14; Pipeline Fragmentation Zone 141; Sand Subbase 15;

[0059] 2. Movable advanced protection device; 2A front half of the movable advanced protection device; 2B rear half of the movable advanced protection device; 21 main support assembly; 22 advanced soil cutting protection assembly; 23 moving assembly; 24 lifting and correction assembly; 25 connecting piece;

[0060] First main frame 211; Second main frame 212; Third main frame 213; Adjustable support 214; Support leg 2141; Support bracket 2142;

[0061] 221 First jack; 222 Curved steel plate; 223 Guide rail; 224 Slider; 225 Ring steel bar; 226 Anchor bolt;

[0062] 2221 impact-resistant steel plate; 2222 filter screen; 2223 buffer layer; 2224 substrate;

[0063] I-beam 241; second jack 242; third jack 243. Detailed Implementation

[0064] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention.

[0065] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0066] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0067] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0068] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0069] In the specification and claims of this invention, the terms "first" and "second" may explicitly or implicitly include one or more of those features. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0070] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0071] 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0072] The following describes in detail, with reference to the accompanying drawings, a movable advanced protection device for artificial pipe jacking under conditions of abrupt changes in soft and hard soil layers according to an embodiment of the present invention.

[0073] The first aspect of this invention provides a movable advanced protection device for artificial pipe jacking in the event of abrupt changes in soil layers, comprising at least: a main support assembly 21, for adapting to pipe jacking pipes 1 of different diameters and providing overall structural support; an advanced soil cutting protection assembly 22, assembled at the front end of the main support assembly 21, for actively cutting into the soil ahead and forming an advanced protection space; a moving assembly 23, located at the bottom of the main support assembly 21, for driving the movable advanced protection device 2 to move along the axis of the pipe jacking pipe 1; and a lifting and correction assembly 24, fixedly connected to the main support assembly 21, for bearing the lifting force to correct the deviation after the pipe jacking pipe 1 sinks; the main support assembly 21, in coordination with the advanced soil cutting protection assembly 22, the moving assembly 23, and the lifting and correction assembly 24, can achieve dynamic advanced protection for pipe jacking construction and active lifting and correction after the pipe jacking pipe 1 sinks in complex strata with abrupt changes in soil layers, and can cooperate with the third jack 243 at the working shaft to form a coordinated jacking force.

[0074] Specifically, such as Figure 1As shown in Figure 4, in this embodiment, the movable advanced protection device 2 consists of four core components: the main support component 21, the advanced soil cutting protection component 22, the moving component 23, and the lifting and correction component 24. The device is divided into a front half 2A and a rear half 2B along the axis of the jacking pipe 1. The front half 2A corresponds to the first main frame 211, the second main frame 212, and the advanced soil cutting protection component 22, primarily undertaking the functions of advanced soil cutting and protection. The rear half 2B corresponds to the third main frame 213, the moving component 23, and the lifting and correction component 24, primarily undertaking the functions of device fixation, movement, and pipe lifting and correction. The two are integrated through a welded structure between the main frames to ensure stable force transmission.

[0075] The main support component 21 uses high-strength square steel pipe as the base material. The cross-sectional dimensions of the square steel pipe need to be determined according to the maximum design diameter of the jacking pipe 1. Typically, square steel pipes with a side length of 100mm-150mm and a wall thickness of not less than 5mm are selected to ensure that the overall load-bearing capacity meets the stress requirements during the cutting and lifting process. The main support component 21 not only provides a stable installation benchmark for the advanced cutting protection component 22, the moving component 23, and the lifting and correction component 24, but also needs to achieve expansion and contraction adjustment within the range of 0 to 500mm through the adjustable support component 214 to adapt to jacking pipes 1 with different inner diameters, avoiding repeated processing of devices due to differences in pipe diameter in the project, and reducing construction costs and time.

[0076] The advanced soil cutting protection component 22 is installed at the front end of the main support component 21 of the front half 2A of the movable advanced protection device. When in use, the advanced soil cutting protection component 22 needs to be precisely aligned with the front soil position of the jacking pipe 1 to ensure that it can cut into the soil at the first time to form a closed protection space, so as to isolate the workers from the risks of quicksand, collapse and other risks in front, and solve the problem of traditional protection devices relying on manual advancement and untimely protection response.

[0077] The movable component 23 is fixed to the bottom of the main support component 21 of the rear half 2B of the movable advanced protection device. Its installation direction must be strictly consistent with the axis of the jacking pipe 1 to ensure the accuracy of the device's movement path and meet the need for temporary adjustment of the protection position when the stratum changes abruptly, breaking the position limitations of traditional fixed protection devices. The lifting and correction component 24 is fixedly connected to the rear of the main support component 21, and the connection strength must be sufficient to withstand the lifting force to avoid structural deformation during pipe sinking and correction.

[0078] When the device is put into use, the main support component 21 can coordinate with other components to work synchronously. During the cutting stage, the main support component 21 of the rear half 2B of the movable advanced protection device forms a stable reaction frame by pressing against the pipe wall through the adjustable support component 214, providing a cutting power foundation for the first jack 221 of the front half 2A of the movable advanced protection device. During the correction stage, the main support component 21 evenly distributes the lifting force transmitted by the lifting correction component 24 to the pipe wall, avoiding excessive local stress that could damage the pipeline. At the same time, the device can cooperate with the third jack 243 at the working well to form a synergistic force of "forward jacking + upward lifting" when the pipeline is lifted, solving the limitations of traditional devices that can only provide single protection or single correction, adapting to the complex construction environment of sudden changes in soft and hard soil layers, and improving the safety and efficiency of construction.

[0079] In some specific embodiments, the main support assembly 21 includes at least a first main frame 211, a second main frame 212, and a third main frame 213; the first main frame 211, the second main frame 212, and the third main frame 213 are arranged sequentially at intervals along the length of the jacking pipe 1, and the three are fixedly connected to form an integral load-bearing structure; each main frame is provided with an adjustable support member 214 at the top, side, and bottom positions, which can extend and retract toward the pipe wall of the jacking pipe 1, and the adjustable support member 214 can be adapted to jacking pipes 1 with different inner diameters through the extension and retraction cooperation between the main frame and the adjustable support member 214.

[0080] like Figure 1 , Figure 2 , Figure 7 As shown, the first main frame 211, the second main frame 212, and the third main frame 213 are all made of high-strength square steel pipes, and are spaced apart along the length of the jacking pipe 1. The three are fixed and welded together by horizontally arranged steel pipes. The welded joints need to be treated with anti-corrosion measures to enhance the structural durability and prevent rust from affecting the load-bearing capacity in a humid underground environment.

[0081] Adjustable supports 214 on each main frame (the collective term for the first main frame 211, the second main frame 212, and the third main frame 213) are arranged at the top, side, and bottom. The top and side adjustable supports 214 are mainly used to press against the pipe wall to generate reaction force, while the bottom adjustable supports 214 serve as an auxiliary stabilizing device to prevent displacement during movement. Each adjustable support 214 consists of a support leg 2141 and a support bracket 2142. The support leg 2141 can be inserted into the square steel pipe of the main frame, and the two are fixed together by connecting parts 25 through pre-drilled holes. When different pipe diameters need to be accommodated, simply adjust the depth of the support leg 2141 inserted into the main frame, and then use the connecting part 25 through the corresponding hole to complete the fixation. This method is convenient and secure. By changing the restrictions on the bolt hole positions, different pipes can be accommodated. The connecting part 25 is preferably a combination of long screws and nuts or a pin. A rubber strip is installed on the side of the support bracket 2142 facing the pipe wall of the jacking pipe 1. The elasticity of the rubber strip can not only improve the fit between the device and the pipe wall of the jacking pipe 1 and reduce the damage to the pipe wall caused by hard contact, but also enhance the seismic resistance, avoid the device displacement caused by construction vibration, and further ensure the stability and adaptability of the device in complex strata construction.

[0082] In some specific embodiments, the advanced soil cutting protection component 22 includes a first jack 221, an arc-shaped steel plate 222, and a directional structure; one end of the first jack 221 is fixed to the third main frame 213 of the main support component 21, and the other end is connected to the arc-shaped steel plate 222 to push the arc-shaped steel plate 222 forward into the soil along the axis of the jacking pipe 1; the side of the arc-shaped steel plate 222 facing the soil is provided with a cutting edge structure, and the curvature of the arc-shaped steel plate 222 is adapted to the curvature of the inner wall of the jacking pipe 1; the directional structure includes a guide rail 223 fixed to the inner wall of the jacking pipe 1 by anchor bolts 226, and a slider 224 fixed to the arc-shaped steel plate 222 and slidable along the guide rail 223, the movement direction of the arc-shaped steel plate 222 is restricted by the cooperation of the guide rail 223 and the slider 224; the guide rails 223 are connected and fixed by ring steel bars 225.

[0083] The width of the arc-shaped steel plate is half the length of the entire circular inner wall of the pipe. The arc-shaped steel plate has a blade-like shape in the direction away from the soil, which facilitates cutting through the soil when it is pushed in. For example... Figure 13 , Figure 14As shown, the arc-shaped steel plate 222 can adopt a multi-layer composite structure, which consists of an impact-resistant steel plate 2221, a filter screen 2222, a buffer layer 2223, and a base plate 2224 from top to bottom. The base plate 2224, i.e., the base steel plate, is preferably a Q345 steel plate with a thickness of 6mm. It mainly serves as the main load-bearing structure and as the installation base for the multi-layer structure of the arc-shaped steel plate 222. The cutting direction of the base plate 2224 is a cutting edge, used for cutting and jacking. The buffer layer 2223 is preferably an aramid honeycomb core board with a thickness of 15mm and a density of 48kg / m³. Its function is to absorb energy and buffer, significantly reducing vibration to the movable advanced protective device during jacking. The filter screen 2222 is preferably a 304 woven mesh with a thickness of 0.4mm. Its function is to intercept large particles. When encountering quicksand strata, the filter screen layer filters the quicksand to prevent it from flowing into the work area. The impact-resistant steel plate 2221 is preferably a Q345 steel plate with a thickness of 8mm. It serves as the first line of defense during the jacking process to disperse the impact force. When encountering boulders or hard soil layers during the jacking process, the impact-resistant steel plate layer is added to enhance the strength of the protective plate and also prevent the buffer layer 2223 and the filter screen 2222 from being directly impacted, thus protecting the integrity of the functions of the buffer layer 2223 and the filter screen 2222.

[0084] The curved steel plate employs a multi-layered composite protective structure, consisting of a base plate, a buffer layer, a filter screen, and an impact-resistant steel plate from bottom to top. The protective layers are joined by riveting, with rivet holes and edges sealed with polyurethane sealant. The rivets are arranged at 60mm longitudinal and 50mm transverse spacing. Furthermore, the base plate 2222 has a cutting edge shape facing the soil, allowing it to adapt to various geological formations and addressing the shortcomings of existing protective devices, such as limited functionality and the need for replacement in different geological conditions.

[0085] like Figure 2 , Figure 3 , Figure 5 , Figure 6 As shown, the first jack 221 is preferably a hydraulic jack, and its thrust parameters are determined according to the hardness of the soil in front, ensuring that the arc-shaped steel plate 222 can be pushed smoothly into the hard soil layer. Compared with the traditional manual thrust or self-weight propulsion method, hydraulic drive can significantly improve the soil cutting efficiency and shorten the construction time.

[0086] One end of the first jack 221 is fixed to the third main frame 213 via a flange, and the other end is connected to the arc-shaped steel plate 222 via bolts. A reinforcing plate must be installed at the connection point to prevent long-term stress from causing connection failure. The length of the arc-shaped steel plate 222 in the advanced soil cutting protection component 22 must be compatible with the length of a single section of the jacking pipe 1, and its width is approximately half the circumference of the inner wall of the jacking pipe 1. The side of the arc-shaped steel plate 222 facing the soil must be machined with a 45°-60° cutting edge structure, with the edge ground smooth to ensure less resistance when cutting into the soil. When the arc-shaped steel plate 222 is connected to the first jack 221, a 20mm thick steel plate must be installed between them as a transition connector. The transition connector and the arc-shaped steel plate 222 are fully welded together, and the transition connector and the first jack 221 are fixed with high-strength bolts to ensure a secure connection. The curvature of the curved steel plate 222 must be perfectly matched with the curvature of the inner wall of the jacking pipe 1 to ensure that it can form a closed space with the pipe wall after being cut into the soil, providing safety protection for the workers.

[0087] The guide rail 223 in the directional structure is made of perforated channel steel and has a slotted structure. The guide rail 223 is uniformly fixed along the inner circumference of the jacking pipe 1 by anchor bolts 226. The anchor bolts 226 are preferably chemical anchor bolts and are evenly arranged along the length of the guide rail to ensure that the advanced soil cutting protection component 22 is firmly fixed and to prevent loosening during soil cutting. The slider 224 is fixed to the arc-shaped steel plate 222 by welding. Precise positioning is required before welding to ensure that the slider 224 can be smoothly embedded into the slot of the guide rail 223 and that there is no jamming during sliding. The guide rails 223 are connected by ring steel bars 225. The ring steel bars 225 need to be welded to the guide rails 223 to form an integral frame, which enhances the deformation resistance of the guide rails 223 and further ensures that the arc-shaped steel plate 222 moves along the axis without deviation, thus improving the accuracy of pipe jacking construction.

[0088] In some specific embodiments, the lifting and correction component 24 includes an I-beam 241, which is fixedly connected to the main support component 21 to form a lifting force carrier. When the jacking pipe 1 sinks, the I-beam 241 can cooperate with the cushion layer 11 formed by the broken pipe section inside the jacking pipe 1. The second jack 242 is set on the cushion layer 11 and lifts the I-beam 241, thereby transmitting the lifting force to the main support component 21 and thus realizing the correction of the jacking pipe 1.

[0089] like Figure 2 , Figure 4 , Figure 9 , Figure 10As shown, the I-beam 241 is made of high-strength material, and its length must cover the rear of the main support component 21. Specifically, it is adapted to the length of the third main frame 213 and is fixed to the third main frame 213 by welding. The weld joints need to be inspected for flaws to ensure welding quality and prevent weld cracking during lifting. The position of the I-beam 241 must correspond to the lower part of the jacking pipe 1 so that it can accurately bear the lifting force of the second jack 242 when the pipe is lowered. The upper flange of the I-beam 241 must correspond to the adjustable support component 214 of the main support component 21 to ensure that the lifting force can be smoothly transmitted to the adjustable support component 214, and then from the adjustable support component 214 to the pipe wall.

[0090] When the jacking pipe 1 sinks due to insufficient bearing capacity of the soft soil layer, the jacking pipe 1 will form a complete pipe section 13 and a sunken pipe section 14. The complete pipe section 13 refers to the complete pipe segment behind the rear half 2B of the movable advanced protection device. The sunken pipe section 14 refers to the first 1-2 sunken pipe segments at the very front of the jacking pipe 1. The part of the sunken pipe section 14 that needs to be broken is defined as the pipe breakage zone 141 (located in the lower half of the pipe, within a 180° radius). During construction, the pipe segments in the pipe breakage zone 141 need to be broken first. The breaking range should be based on the premise of not affecting the protective function of the arc-shaped steel plate 222. The broken pipe fragments are then removed. Then, a small grouting machine enters the pipe to grout and reinforce the broken pipe section. After reinforcement, a layer of soil is backfilled and compacted to form a cushion layer 11. The thickness of the cushion layer 11 needs to meet the support requirements of the second jack 242 to ensure that it does not collapse during the lifting process. The second jack 242 also uses hydraulic drive. Its output direction must be perpendicular to the axis of the jacking pipe 1 and upward. When placing it, it must be precisely aligned with the lower flange of the I-beam 241 to ensure that the lifting force can be vertically transmitted to the I-beam 241, avoiding lateral forces that could cause the device to shift. In this way, the lifting force can be evenly transmitted to the main support component 21 through the I-beam 241, and then distributed to the pipe wall of the complete pipe section 13, realizing the overall lifting and correction of the pipe sinking section 14. This solves the problem of traditional correction methods relying on the bearing capacity of the soil in front and failing in soft soil layers, while avoiding excessive local stress that could damage the pipe, and meeting the need for rapid lifting and correction.

[0091] In some specific embodiments, the mobile component 23 consists of at least two tanks. The tanks are fixed to the bottom of the main support component 21, and the direction of travel of the tanks is consistent with the axis of the jacking pipe 1. They can drive the movable advanced protection device 2 to move along the axis of the jacking pipe 1 to the next construction position. A pad 12 is laid at the bottom of the inner wall of the jacking pipe 1, and a sand pad layer 15 is provided below the pad 12 to form the walking foundation of the mobile component 23.

[0092] like Figure 1 , Figure 4 , Figure 7As shown, the tank vehicle is preferably a straight-lined tank vehicle with sufficient load-bearing capacity. Its rated load must be greater than the overall weight of the movable advanced protection device 2 to ensure that no malfunction occurs when moving the device. The tank vehicle is welded and fixed to the H-beam 241 at the bottom of the main support component 21. Before fixing, the position of the tank vehicle needs to be adjusted to ensure that its direction of travel is completely consistent with the axis of the jacking pipe 1, so as to avoid deviation from the construction route when the device moves. The distance between the tank vehicles is preferably equal to the center distance between two adjacent pipe sections to ensure that the device can stably cover the entire pipe section 13 when moving, and avoid deviation.

[0093] The pad 12 laid at the bottom of the inner wall of the jacking pipe 1 is preferably a steel plate. The length of the pad 12 needs to cover the commonly used range of the device movement, and the width is slightly smaller than the inner diameter of the jacking pipe 1. The sand pad 15 below the pad 12 can be a sand pad or a gravel pad. It needs to be laid flat and compacted during laying. On the one hand, it can avoid the tank vehicle from directly contacting the pipe wall and causing damage to the pipe wall. On the other hand, it can reduce the resistance when the tank vehicle moves and ensure that the device moves smoothly.

[0094] Once the curved steel plate 222 has cut to the preset distance and the soil excavation is complete, simply retract the adjustable support 214 of the main support assembly 21 to detach the support bracket 2142 from the pipe wall, and then start the tank vehicle to move the device along the pad 12 to the next construction position. No disassembly and reassembly are required, making operation convenient and effectively shortening the time between work processes. Furthermore, the setup of at least two tank vehicles ensures the stability of the device during movement, preventing tilting due to unilateral force and further enhancing construction safety.

[0095] In some specific embodiments, the guide rail 223 is uniformly fixed along the inner circumference of the jacking pipe 1, and the guide rail 223 has a slot-type structure; the shape of the slider 224 is adapted to the slot-type structure, and after the slider 224 is embedded in the slot, it can slide stably along the guide rail 223 to avoid deviation when the arc-shaped steel plate 222 cuts the soil.

[0096] like Figure 2 , Figure 3 , Figure 5 , Figure 6As shown, when the guide rails 223 are uniformly fixed along the inner circumference of the jacking pipe 1, the equidistant points on the circumference must first be determined using measuring tools to ensure consistent spacing between each guide rail 223. Typically, 3-4 guide rails 223 are arranged to ensure directional effectiveness without excessively occupying internal pipe space and affecting operations. The slotted structure of the guide rails 223 needs to be designed according to the shape of the slider 224. The width and depth of the slots must be slightly larger than the corresponding dimensions of the slider 224 to ensure smooth insertion and no jamming during sliding. The opening of the slots must be chamfered to prevent scratches on the slider 224 during insertion. The slider 224 is made from cut steel plate, and its shape perfectly matches the slotted structure of the guide rails 223. When welding the slider 224 to the curved steel plate 222, it is necessary to ensure that the central axis of the slider 224 is aligned with the central axis of the guide rail 223. After welding, grinding is required to remove weld slag and prevent obstruction of the slider 224's movement during sliding. During the process of the arc-shaped steel plate 222 being pushed into the soil by the first jack 221, the slider 224 will slide stably along the groove of the guide rail 223, strictly limiting the movement direction of the arc-shaped steel plate 222, avoiding its deviation due to uneven soil resistance, and ensuring that the arc-shaped steel plate 222 always moves along the axis of the jacking pipe 1. This not only ensures the integrity of the protective space, but also improves the construction accuracy at the connection between the complete pipe section 13 and the pipe sinking section 14, solving the problem of easy deviation when cutting soil with traditional devices.

[0097] Furthermore, the guide rail 223 and slider 224 adopt an integrated design for anti-deviation and drag reduction: rectangular grooves are formed along the length of both sides of the slider 224, with a groove depth of 8mm-10mm and a width of 10mm-12mm. The grooves are uniformly filled with balls of 6mm-8mm diameter, made of GCr15 bearing steel with a surface hardness ≥60HRC. The ball filling amount is such that the grooves are completely filled with no obvious gaps between the balls. Sealing plates are welded to both ends of the grooves, and these plates are fully welded to the slider 224 to form a closed space, preventing the balls from detaching from the grooves during sliding. Simultaneously, the inner wall of the guide rail 223's groove where it contacts the balls is polished to ensure smooth rolling of the balls along the guide rail 223.

[0098] The grooves on both sides of the slider 224 and the sealing plate form a lateral constraint, restricting the displacement of the slider 224 along the length direction perpendicular to the guide rail 223, and preventing the slider 224 from detaching from the guide rail 223; while the rolling contact between the ball and the guide rail 223 replaces the traditional sliding contact, converting the sliding friction force into rolling friction force, which greatly reduces the frictional resistance between the slider 224 and the guide rail 223, ensuring that the arc-shaped steel plate 222 can smoothly cut into the soil under the push of the first jack 221, while reducing the wear of the guide rail 223 and the slider 224, and extending the service life of the components.

[0099] In some specific embodiments, the adjustable support 214 includes a support leg 2141 and a support bracket 2142. The support leg 2141 is slidably connected to the main frame, and the support bracket 2142 is fixed to the end of the support leg 2141 facing the pipe wall of the jacking pipe 1. The support leg 2141 and the main frame of the adjustable support 214 are provided with holes at intervals along the length direction. By inserting the connector 25 into different holes, the extension and retraction of the adjustable support 214 can be adjusted to further adapt to the construction needs of jacking pipes 1 with different pipe diameters.

[0100] like Figure 1 , Figure 2 , Figure 7 As shown, the support leg 2141 of the adjustable support 214 is made of square steel pipe, and its outer diameter needs to be slightly smaller than the inner diameter of the square steel pipe of the main frame to ensure that the support leg 2141 can be smoothly inserted into the main frame and slide freely. The length of the support leg 2141 needs to be designed according to the common inner diameter range of the jacking pipe 1 to ensure sufficient expansion and contraction margin to adapt to different pipe diameters. The support bracket 2142 is composed of a triangular steel bracket plate and an arc-shaped steel bracket plate. The triangular steel bracket plate is rotatably connected to the support leg 2141 by a pin bolt. The angle can be adjusted according to the curvature of the pipe wall of the complete pipe section 13 to ensure that the arc-shaped steel bracket plate can fit tightly with the pipe wall. The arc-shaped steel bracket plate and the triangular steel bracket plate are welded and fixed. The weld needs to be fully welded to enhance the structural strength. The side of the arc-shaped steel bracket plate facing the pipe wall is connected to a rubber strip by rivets. The thickness of the rubber strip needs to be determined according to the flatness of the inner wall of the pipe to fill the small depressions of the pipe wall and avoid damage to the pipe wall caused by hard contact. The holes on the support legs 2141 and the main frame must be evenly distributed along the length. The diameter of the holes must match the diameter of the connector 25. The connector 25 uses pin bolts. During operation, simply adjust the support legs 2141 to the appropriate length, insert the pin bolts into the corresponding holes, and tighten them to complete the fixation. No complicated tools are required, making it convenient for operators to work in the confined space inside the pipe. Through this telescopic adjustment method, the adjustable support 214 can adapt to jacking pipes 1 with different inner diameters, eliminating the need to manufacture separate devices for different pipe diameters. This significantly improves the versatility of the device and reduces construction costs. At the same time, the pin bolt fixing method ensures that the adjustable support 214 does not loosen during construction, guaranteeing the stability of the device.

[0101] The second aspect of this invention provides a construction method for a movable advanced protection device for artificial pipe jacking in the event of abrupt changes in the soil layers of soft and hard soil, comprising the following steps:

[0102] S1: Move the movable advanced protection device 2 into the jacking pipe 1, adjust the adjustable support 214 on each main frame of the main support assembly 21, so that the support bracket 2142 of the adjustable support 214 is pressed against the pipe wall of the jacking pipe 1, and the movable advanced protection device 2 is fixed.

[0103] S2: Activate the first jack 221 of the advanced soil cutting protection component 22 to push the arc-shaped steel plate 222 to cut into the soil in front along the guide rail 223. The workers excavate the soil within the protective space formed by the arc-shaped steel plate 222.

[0104] S3: After the arc-shaped steel plate 222 cuts into the preset distance, the adjustable support components 214 are retracted. The movable advanced protection device 2 is moved along the axis of the jacking pipe 1 to the next construction position through the moving component 23. Steps S1-S2 are repeated to achieve dynamic advanced protection.

[0105] S4: If the jacking pipe 1 sinks, break the pipe section of the foremost section to be broken and remove it, grout it, and reinforce it to form a cushion layer 11. Install the second jack 242 on the cushion layer 11 to tighten the I-beam 241 of the lifting and correction component 24. Simultaneously start the third jack 243 at the working shaft to exert force forward. Combine the monitoring equipment to check the elevation of the jacking pipe 1 and complete the lifting and correction of the jacking pipe 1. The third jack 243 is located in the working shaft near the intact jacking pipe 1, and the force output direction is forward along the axis of the jacking pipe 1.

[0106] like Figures 8 to 12 As shown, before performing step S1, a pad 12 and a sand pad layer 15 must be laid on the bottom of the inner wall of the complete pipe section 13 to ensure that the tank of the moving component 23 can move smoothly. The movable advanced protection device 2 is moved into the jacking pipe 1 through the hoisting equipment in the working shaft and slowly placed on the pad 12. Then, the operators enter the pipe to adjust the adjustable support members 214 on each main frame. During adjustment, the bottom adjustable support member 214 must be adjusted first to keep the device horizontal. Then, the side and top adjustable support members 214 are adjusted in sequence to ensure that the rubber strips of the support brackets 2142 are tightly attached to the pipe wall. The connecting parts 25 are tightened by hand or with special tools to complete the device fixation. After fixation, the tightness of each adjustable support member 214 must be checked to avoid any looseness.

[0107] In step S2, before starting the first jack 221, the cooperation between the guide rail 223 and the slider 224 must be checked to ensure there is no jamming. Then, the advancing rate of the first jack 221 is set according to the hardness of the soil in front. The jack is started slowly to push the arc-shaped steel plate 222 into the soil along the guide rail 223. During the cutting process, a special person must be arranged to observe the movement direction of the arc-shaped steel plate 222 to ensure there is no deviation. After the arc-shaped steel plate 222 has cut into the preset distance, the first jack 221 is closed. The operator carries the excavation tools into the protective space formed by the arc-shaped steel plate 222 to excavate the soil. The excavation process must be carried out in a preset order to avoid the collapse of the soil in front of the pipeline sinking section 14. The excavated soil is transported to the working well and transported out by handcarts and other transportation equipment.

[0108] In step S3, after the soil excavation is completed, the workers need to first retract each adjustable support 214 to detach the support bracket 2142 from the pipe wall, and then start the tank of the moving component 23 to move the device along the axis of the jacking pipe 1 to the next construction position. During the movement, the speed of the tank needs to be controlled to avoid the device shaking due to excessive speed. After reaching the designated position, the fixing operation of step S1 and the soil cutting excavation operation of step S2 are repeated to form dynamic advance protection, ensuring that the complete section 13 of the pipeline is always protected as it extends forward, which meets the requirements of "dynamic movement and repeated protection".

[0109] In step S4, if the monitoring equipment detects that the jacking pipe 1 has formed a pipe sinking section 14, and the sinking amount is >5mm, the pipe breakage zone 141 needs to be demarcated first: determine the number of broken pipe sections based on the sinking amount, use a chalk line to mark the boundary of the pipe breakage zone 141 on the inner wall of the pipe sinking section 14, and under the protection of the arc-shaped steel plate 222, use a handheld impact drill to break the lower half of the pipe breakage zone 141 to avoid breaking the upper half and affecting the protection space; remove the broken pipe fragments, and then a small grouting machine enters the pipe to grout and reinforce the broken pipe section. After reinforcement, a layer of soil is backfilled, and then compacted with a small rammer to form a cushion layer 11. On the cushion layer 11, corresponding H-beams 2 are placed. Install the second jack 242 at position 41, and adjust the height of the jack so that the top is in contact with the I-beam 241. Simultaneously start the third jack 243 at the working well and the second jack 242 at the cushion layer 11. The third jack 243 provides the jacking force forward along the pipeline axis, and the second jack 242 provides the lifting force upward. During the lifting process, the elevation of the pipeline sinking section 14 is checked in real time by the monitoring equipment. If the elevation deviation exceeds ±3mm, the output of the second jack 242 is adjusted in time until the pipeline elevation is restored to the design value. Then, the jacks are closed and locked to complete the lifting and correction of the pipeline sinking section 14, ensuring a smooth connection between the pipeline sinking section 14 and the complete pipeline section 13.

[0110] In some specific embodiments, step S2 specifically includes:

[0111] S21: Based on the inner diameter of the jacking pipe 1 and the hardness of the soil in front, determine the single cutting distance of the arc steel plate 222 to ensure that the workers have a safe excavation space;

[0112] S22: Start the first jack 221 and control the first jack 221 to push the arc-shaped steel plate 222 along the guide rail 223 towards the soil until the arc-shaped steel plate 222 cuts into the preset distance;

[0113] S23: Workers enter the enclosed protective space formed by the arc-shaped steel plate 222, excavate the soil in a preset sequence, and transport the excavated soil to the working well and then transport it out.

[0114] like Figure 2 , Figure 5 , Figure 8 As shown, in step S21, when determining the single cutting distance of the arc-shaped steel plate 222, the inner diameter of the jacking pipe 1 and the hardness of the soil in front need to be considered comprehensively. If the inner diameter of the pipe is large and the soil hardness is low, the cutting distance can be appropriately increased. If the inner diameter of the pipe is small and the soil hardness is high, the cutting distance needs to be reduced. The core is to ensure that the workers have enough operating space after entering the protective space, while avoiding the arc-shaped steel plate 222 from cutting too deep, which would cause its own support to be unstable.

[0115] In step S22, before starting the first jack 221, it is necessary to check whether the pressure of the hydraulic system is normal and whether the oil pipe connection is secure to avoid hydraulic leakage affecting the soil cutting effect. After starting, the jack's pushing speed needs to be controlled by the control valve to maintain uniform pushing speed. During the pushing process, it is necessary to observe the sliding of the slider 224 in the guide rail 223. If jamming occurs, the pushing should be stopped immediately, the fault should be checked and eliminated to ensure that the arc-shaped steel plate 222 smoothly cuts into the soil until the preset distance is reached. Then, the jack is turned off and the hydraulic system is locked to prevent the arc-shaped steel plate 222 from retreating due to the soil reaction force.

[0116] In step S23, before entering the protected space, the workers must first check the stability of the curved steel plate 222 and confirm that it is not loose before entering. The excavation sequence is usually carried out according to the principle of "top to bottom, middle to sides". Excavating the upper soil first can prevent the soil from collapsing due to loss of support, and excavating the middle soil first can provide the workers with initial operating space. During the excavation process, scattered soil must be cleared in time to avoid accumulation that affects the operation. The excavated soil must be transported out in time by handcart or small transfer equipment to avoid excessive accumulation in the protected space, which would increase the bearing pressure on the curved steel plate 222 and ensure the safety and efficiency of the operation.

[0117] In some specific embodiments, step S4 specifically includes:

[0118] S41: Determine the subsidence of the jacking pipe 1 by monitoring equipment, identify the proposed crushing section as the foremost several pipe sections of the jacking pipe 1, and mark the crushing boundary;

[0119] S42: Under the protection of the arc-shaped steel plate 222, the broken pipe fragments are removed from the designated part of the section of pipe to be broken, and then grouting is performed to reinforce it. The soil is then backfilled to form a cushion layer 11 that meets the support requirements of the second jack 242.

[0120] S43: Install the second jack 242 on the pad 11 at the position corresponding to the I-beam 241, so that the top of the second jack 242 is in contact with the I-beam 241;

[0121] S44: Simultaneously start the third jack 243 at the working well and the second jack 242 at the cushion layer 11. The third jack 243 provides the jacking force forward along the axis of the jacking pipe 1, and the second jack 242 provides the lifting force perpendicular to the axis of the jacking pipe 1.

[0122] S45: The elevation of the jacking pipe 1 is checked in real time by monitoring equipment. If the deviation exceeds the requirements of the construction specifications, the output of the second jack 242 is adjusted until the elevation of the jacking pipe 1 is restored to the design value.

[0123] like Figures 9 to 12 As shown, in step S41, the monitoring equipment is preferably an infrared laser monitor. Before monitoring, steel reference points (50mm in diameter and 10mm in thickness) are set at the working well and the receiving well, and the elevation of the reference points is calibrated using a total station. The laser is installed next to the reference point at the working well, and the laser beam is projected along the design axis to the laser target at the front end of the pipeline sinking section 14. The elevation data is read and compared with the design value to determine the sinking amount of the pipeline sinking section 14, thereby determining the range of the pipeline breakage zone 141. The breakage boundary is marked with a chalk line to ensure that the breakage range is accurate and that the intact pipeline section 13 is not damaged.

[0124] In step S42, when breaking the pipe section 141, the operation must be carried out under the protection of the curved steel plate 222. Workers must wear safety protective equipment and use a handheld impact drill to break the pipe section from the lower half. During the breaking process, the force and direction of the impact drill must be controlled to avoid damaging adjacent intact pipe sections. After removing the broken pipe fragments, a small grouting machine is inserted into the pipe to grout and reinforce the broken section. After reinforcement, a layer of soil is backfilled, and then compacted with a small rammer to form a cushion layer 11.

[0125] The thickness of the subbase 11 needs to be determined according to the support requirements of the second jack 242 to ensure that it can withstand the lifting force of the jack. During the compaction process, it needs to be compacted multiple times to form a subbase 11 that meets the support requirements of the second jack 242. Loose areas in the subbase 11 should be avoided to prevent collapse during lifting.

[0126] In step S43, before installing the second jack 242, a steel plate needs to be placed on the pad 11 at the position corresponding to the I-beam 241 to increase the bearing area and prevent the jack from sinking. Place the second jack 242 on the steel plate and adjust the extension of the jack to make the top fit tightly against the lower flange of the I-beam 241. After fitting, check the verticality of the jack to ensure that the output direction is vertically upward and avoid lateral force.

[0127] In step S44, before simultaneously starting the third jack 243 and the second jack 242, it is necessary to coordinate the workers at the working well and inside the pipeline to ensure smooth communication. After starting, it is necessary to control the output rate of the jacks and maintain a slow and uniform force. The jacking force of the third jack 243 must match the lifting force of the second jack 242 to avoid pipeline displacement or damage due to uneven force, which is in line with the core design of "dual jacks working together".

[0128] In step S45, during the lifting process, the pipeline elevation data needs to be acquired in real time through monitoring equipment. The elevation value is recorded at regular intervals and compared with the design elevation to calculate the deviation. If the deviation exceeds the requirements of the construction specifications, the output of the second jack 242 needs to be adjusted in time. If the deviation is large, the output should be increased appropriately, and if the deviation is small, the output should be decreased until the pipeline elevation is restored to the design value. Then, the jack is turned off and locked to complete the lifting and correction, ensuring that the axial accuracy of the pipe jacking construction meets the requirements.

[0129] This invention, through the coordinated design of the device structure and construction method, achieves dynamic protection, precise deviation correction, multi-diameter adaptation, and efficient operation in manual pipe jacking construction in complex strata. Specific beneficial effects are as follows:

[0130] The main support component 21 adopts multiple main frames (first main frame 211, second main frame 212, and third main frame 213) to form an overall load-bearing structure. With the help of adjustable support members 214 at the top, sides, and bottom, the adjustable support members 214 can be adjusted to match the angle of the support bracket 2142, which can flexibly adapt to jacking pipes 1 with different inner diameters. There is no need to make a separate movable advanced protection device 2 for different pipe diameters, which solves the problems of poor adaptability and high repeated investment costs of traditional protection devices. The adjustable support members 214 are fixed to the connectors 25 through holes, and the adjustment operation is convenient. After being tightened against the pipe wall of the jacking pipe 1, it can provide stable support for the device and prevent the device from shifting during construction and affecting the protection effect.

[0131] The advanced soil cutting protection component 22 uses the first jack 221 as a power source to push the arc-shaped steel plate 222 into the soil. Compared with the traditional manual pushing or self-weight propulsion method, it greatly improves the soil cutting efficiency of hard soil layers and shortens the operation time. The arc-shaped steel plate 222 with a cutting edge structure reduces soil cutting resistance. With the directional constraint of the guide rail 223 and the slider 224, it ensures that the soil cutting direction is along the axis of the jacking pipe 1, avoiding the arc-shaped steel plate 222 from deviating and causing deformation of the protective space. At the same time, the closed protective space formed by the arc-shaped steel plate 222 can effectively isolate the risk of soil collapse in front and ensure the safety of the operators. The guide rails 223 are connected and fixed by the ring steel bar 225, which further enhances the stability of the directional structure and prevents the deformation of the guide rails 223 from affecting the movement accuracy of the arc-shaped steel plate 222.

[0132] The I-beam 241 of the lifting and correction assembly 24 is fixed to the main support assembly 21 to form a force-bearing carrier. When the jacking pipe 1 sinks, the cushion layer 11 formed by cleaning and grouting backfilling after the broken pipe section provides stable support for the second jack 242. The lifting force is transmitted by the second jack 242 tightening the I-beam 241. Combined with the forward jacking force of the third jack 243 at the working well, a synergistic force of "upward lifting + forward jacking" is formed, which solves the problem of the failure of conventional correction methods due to insufficient bearing capacity of soft soil layers. The monitoring equipment verifies the elevation of the jacking pipe 1 in real time and adjusts the output of the second jack 242 to ensure the accuracy of pipe lifting and avoid the vicious cycle of "sinking-difficult correction". The I-beam 241 is made of high strength to ensure that it does not bend or deform during the lifting process and to ensure the stability of force transmission.

[0133] The mobile component 23 is fixed to the bottom of the main support component 21 by at least two straight tank vehicles. After the arc-shaped steel plate 222 is cut into the preset distance, the adjustable support component 214 can be retracted to move the movable advanced protection device 2 along the axis of the jacking pipe 1 via the tank vehicles. It can achieve dynamic advanced protection without disassembly and reassembly, which solves the drawbacks of traditional fixed protection devices that are difficult to repair when malfunctioning and cannot be adjusted in time due to sudden changes in the stratum. The bottom of the inner wall of the jacking pipe 1 is covered with a pad plate 12 and a pad layer 11 to form the walking foundation of the mobile component 23, which avoids the tank vehicles from directly contacting the pipe wall and causing damage. At the same time, it ensures the stability of the movement process and avoids the device from shifting and affecting subsequent construction.

[0134] The construction method employs a cyclical process of "device fixing - soil cutting and protection - dynamic movement." This involves adjusting the adjustable support 214 to tighten against the pipe wall to fix the movable advanced protection device 2; activating the first jack 221 to push the arc-shaped steel plate 222 to cut the soil; and retracting the adjustable support 214 to move the device via the moving component 23, enabling continuous advanced protection operations and reducing process connection time. During the sinking and correction of the jacking pipe 1, the design of steps including cleaning the broken front pipe section, grouting and backfilling the formed cushion layer 11, and simultaneously activating the second jack 242 and the third jack 243 to work together simplifies the correction operation, eliminates the need for additional auxiliary facilities, and shortens the correction period. In the overall process, the functions of the first jack 221 (soil cutting), the second jack 242 (lifting), and the third jack 243 (jacking) are clearly defined, and combined with the precision control of monitoring equipment, form an integrated solution of "protection-movement-correction."

[0135] In summary, the movable advanced protection device 2 of the present invention, in synergy with the rapid lifting method, solves the problems of poor flexibility, low soil cutting efficiency, lack of correction ability, and limited adaptability of traditional manual pipe jacking protection devices. It achieves safe, efficient, and precise control of manual pipe jacking construction in complex strata and has significant practical value.

[0136] Of course, for those skilled in the art, the other structures and working principles of the movable advanced protection device for artificial pipe jacking under the condition of sudden change in soft and hard soil layers are understandable and achievable, and will not be described in detail in this invention.

[0137] While specific embodiments of the invention have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of the invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. An artificial pipe jacking movable advanced protection device in the case of sudden change of hard and soft soil layers of a stratum, characterized in that, The utility model relates to a kind of pipe jacking construction device and method, including: Main body support component (21), for adapting different pipe diameter pipe jacking conduit (1) and providing overall structural support; Leading cutting soil protection component (22), assembly in the front end of the main body support component (21), for actively cutting into front soil body and forming leading protection space; Moving assembly (23), is located at the bottom of the main body support component (21), for driving movable leading protection device (2) moves along pipe jacking conduit (1) axis; Lifting deviation rectification component (24), connect with the main body support component (21), for receiving lifting force to realize pipe jacking conduit (1) deviation rectification after sinking; The main body support component (21) is respectively with leading cutting soil protection component (22), moving assembly (23), lifting deviation rectification component (24) cooperation, can realize pipe jacking construction's dynamic leading protection and actively lifting deviation rectification after pipe jacking conduit (1) sinking when stratum suddenly changes from hard soil to soft soil below underground water level, and can form collaborative jacking force with the third jack (243) of work well.

2. The movable advance protection device for artificial pipe pushing under the condition of soft and hard soil layer mutation of the stratum according to claim 1, characterized in that, The main body support component (21) at least includes first main frame body (211), second main frame body (212) and third main frame body (213);The first main frame body (211), second main frame body (212) and third main frame body (213) are sequentially spaced along the length direction of pipe jacking conduit (1), and are fixedly connected between the three to form an overall load-bearing structure;The top, side and bottom of each main frame body are respectively provided with adjustable support (214) that stretches towards the pipe wall direction of pipe jacking conduit (1), and the adjustable support (214) and the main frame body are stretched and fitted, to adapt to different inner diameter pipe jacking conduit (1).

3. The movable advance protection device for artificial pipe pushing under the condition of sudden change of soft and hard soil layers of stratum according to claim 1, characterized in that, The leading cutting soil protection component (22) includes first jack (221), arc steel plate (222) and directional structure;The first jack (221) is fixed at one end with the third main frame body (213) of main body support component (21), and the other end is connected with arc steel plate (222) to push arc steel plate (222) and cut into soil body along pipe jacking conduit (1) axis;The side of arc steel plate (222) towards soil body is provided with blade structure, and the arc of arc steel plate (222) is adapted to the inner wall arc of pipe jacking conduit (1);The directional structure includes guide rail (223) fixed on the inner wall of pipe jacking conduit (1) by anchor bolt (226), and sliding block (224) fixed with arc steel plate (222) and can slide along guide rail (223), the moving direction of arc steel plate (222) is limited by the cooperation of guide rail (223) and sliding block (224).

4. The movable advance protection device for artificial pipe pushing under the condition of soft and hard soil layer mutation of the stratum according to claim 3, characterized in that, The lifting deviation rectification component (24) includes I-beam (241), and the I-beam (241) is fixedly connected with the main body support component (21) to form lifting force bearing carrier;When pipe jacking conduit (1) sinks, the I-beam (241) can cooperate with the cushion (11) formed by broken pipe section in pipe jacking conduit (1), the lifting force is transmitted to the main body support component (21) by setting the second jack (242) on the cushion (11) and lifting the I-beam (241), and then the deviation rectification of pipe jacking conduit (1) is realized.

5. The movable advance protection device for artificial pipe pushing under the condition of soft and hard soil layer mutation of the stratum according to claim 4, characterized in that, The moving assembly (23) is at least two tanks fixed at the bottom of the main body support assembly (21) and moving in the same direction as the axis of the pipe jacking pipe (1), which can drive the movable advanced protection device (2) to move along the axis of the pipe jacking pipe (1) to the next construction position; the inner wall of the pipe jacking pipe (1) is paved with a base plate (12) at the bottom, and a sand cushion layer (15) is arranged below the base plate (12) to form the walking foundation of the moving assembly (23).

6. The movable advance protection device for artificial pipe pushing under the condition of soft and hard soil layer mutation of the stratum according to claim 3, characterized in that, The guide rail (223) is evenly fixed along the inner wall of the pipe jacking pipe (1) and has a clamping groove structure; the shape of the sliding block (224) is matched with the clamping groove structure, and the sliding block (224) can stably slide along the guide rail (223) after being embedded in the clamping groove, avoiding the deviation of the arc-shaped steel plate (222) when cutting soil.

7. The movable advance protection device for artificial pipe pushing under the condition of soft and hard soil layer mutation of the stratum according to claim 2, characterized in that, The adjustable support (214) includes a support leg (2141) and a support bracket (2142), the support leg (2141) is slidingly connected with the main frame body, and the support bracket (2142) is fixed to one end of the support leg (2141) facing the pipe wall of the pipe jacking pipe (1); the support leg (2141) of the adjustable support (214) and the main frame body are both provided with hole positions spaced apart along the length direction, and the connecting piece (25) is inserted into different hole positions to adjust the extension amount of the adjustable support (214) and further adapt to the construction requirements of the pipe jacking pipe (1) with different diameters.

8. A method for rapid lifting of artificial pipe jacking based on the device of any one of claims 4-5 in the case of sudden change of hard and soft soil layers, characterized in that, The method comprises the following steps: S1: moving the movable advanced protection device (2) into the pipe jacking pipe (1), adjusting the adjustable supports (214) on the main frame bodies of the main body support assembly (21) to make the support brackets (2142) of the adjustable supports (214) tightly abut against the pipe wall of the pipe jacking pipe (1), and fixing the movable advanced protection device (2); S2: starting the first jack (221) of the advanced soil cutting protection assembly (22) to push the arc-shaped steel plate (222) to cut into the front soil body along the guide rail (223), and the operator digs the soil body in the protection space formed by the arc-shaped steel plate (222); S3: after the arc-shaped steel plate (222) cuts in a preset distance, the adjustable supports (214) are retracted, the movable advanced protection device (2) is moved to the next construction position along the axis of the pipe jacking pipe (1) by the moving assembly (23), and the steps S1-S2 are repeated to realize dynamic advanced protection; S4: if the pipe jacking pipe (1) sinks, the pipe section at the front end of the pipe jacking pipe (1) is broken, the broken pipe section is removed and grouted to form a cushion layer (11), the second jack (242) is installed on the cushion layer (11) to tightly abut against the I-shaped steel (241) of the lifting and correction assembly (24), the third jack (243) at the working well is started to generate force forward, the elevation of the pipe jacking pipe (1) is checked by the monitoring equipment, and the lifting and correction of the pipe jacking pipe (1) are completed; the third jack (243) is arranged in the working well close to the complete pipe jacking pipe (1) and generates force along the axis of the pipe jacking pipe (1) forward.

9. The method according to claim 8, wherein the method is characterized in that, The first jack (221) of the starting advanced cutting soil protection assembly (22) pushes the arc-shaped steel plate (222) to cut into the front soil body along the guide rail (223), and the operator excavates the soil body in the protection space formed by the arc-shaped steel plate (222), and specifically comprises: S21: According to the inner diameter of the pipe jacking pipe (1) and the hardness of the front soil body, the single cutting distance of the arc-shaped steel plate (222) is determined to ensure that the operator has a safe excavation space; S22: Start the first jack (221), control the first jack (221) to push the arc-shaped steel plate (222) to move along the guide rail (223) to the soil body direction, until the arc-shaped steel plate (222) cuts into the preset distance; S23: The operator enters the closed protection space formed by the arc-shaped steel plate (222), excavates the soil body in the preset order, and the excavated soil body is transported to the working well and transported out by the transportation equipment.

10. The method according to claim 8, wherein the method is characterized in that, If the pipe jacking pipe (1) sinks, the pipe section at the front end of the broken pipe jacking pipe (1) is broken, and the broken pipe section is removed, grouted, and reinforced to form a cushion layer (11), and the I-beam (241) of the lifting and correcting assembly (24) is installed on the cushion layer (11). Synchronously start the third jack (243) at the working well to provide forward force, and check the elevation of the pipe jacking pipe (1) by the monitoring device to complete the lifting and correction of the pipe jacking pipe (1), specifically comprising: S41: Determine the broken section as the front end of the pipe jacking pipe (1) by the monitoring device to determine the broken section as the front end of the pipe jacking pipe (1), and mark the broken boundary; S42: Under the protection of the arc-shaped steel plate (222), break the specified part of the pipe section in the broken section, remove the broken pipe fragments, then grout and reinforce, backfill the soil body, and form a cushion layer (11) that meets the support requirements of the second jack (242); S43: Install the second jack (242) on the cushion layer (11) corresponding to the position of the I-beam (241), so that the top of the second jack (242) is attached to the I-beam (241); S44: Synchronously start the third jack (243) at the working well and the second jack (242) at the cushion layer (11), the third jack (243) provides a jacking force along the axis of the pipe jacking pipe (1) in the forward direction, and the second jack (242) provides a lifting force perpendicular to the axis of the pipe jacking pipe (1) in the upward direction; S45: Check the elevation of the pipe jacking pipe (1) in real time by the monitoring device, if the deviation exceeds the requirement of the construction specification, adjust the output of the second jack (242), until the elevation of the pipe jacking pipe (1) returns to the design value.

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