A silt pipe jacking method based on axial constraint

Abstract

The present invention discloses a silt pipe jacking method based on axial constraint, including a pipe jacking machine system and a pipe jacking construction method. The pipe jacking machine system includes a machine head, a hydraulic propulsion mechanism, a guide pipe, a machine head guide rail, a guide pipe, a connecting seat, and a rigid chain transmission box. The rigid chain transmission box is connected to the corresponding connecting seat through a rigid push-pull chain. The rigid push-pull chain can only bend to the side away from the axial direction of the guide pipe and has rigidity inward along the radial direction of the guide pipe. Several rigid push-pull chains and the guide pipe together constrain the machine head, the guide pipe and several pipe sections connected to the rear end of the guide pipe to move axially and make the offset range of the machine head controllable. The guide pipe and the pipe sections, and the pipe sections are rigidly connected. The present invention cooperates with a servo motor to pull the guide pipe during the process of advancing the pipe section, and determines whether the overall structure is excavating along the set axial direction through the consistency of the values ​​of each pressure sensor, thereby realizing the control of the excavation direction of the overall structure.

Description

Technical Field

[0001] The invention relates to the technical field of pipe jacking machines, and in particular to a silt pipe jacking method based on axial constraint. Background Art

[0002] Pipe jacking is a trenchless construction method. Using the jacking force generated by jacking equipment within a working pit, the pipe (i.e., the jacking pipe) is pushed into the soil according to the designed slope, and the soil is removed. In actual pipe jacking, multiple pipe sections are typically used. After one section is pushed into the soil, the next section is pushed in. The principle is to use the thrust of the main jacking cylinder and other components such as the pipeline and relay chambers to push the tool pipe or tunnel boring machine from the working pit (also known as the working shaft or launch shaft) through the soil (i.e., exit the hole) and hoist it into the receiving pit (also known as the receiving shaft). The pipeline is then buried between the two pits, following the tool pipe or tunnel boring machine. Trenchless engineering technology has completely eliminated the problems of pipeline burial, such as damage to urban buildings and traffic congestion, and offers significant advantages in soil stabilization and environmental protection.

[0003] A pipe jacking machine is a piece of construction equipment used in pipe jacking construction. Currently, the main type of pipe jacking machine is a hydraulic one, consisting of a rotary excavation system, a main jacking hydraulic propulsion system, a soil conveying system, a grouting system, measurement equipment, ground hoisting equipment, and an electrical system. The rotary excavation system (commonly known as the "machine head") primarily consists of the machine head housing, a cutting disc, a cutterhead speed reducer, a slurry delivery mechanism, a hydraulic power unit, a deviation correction hydraulic cylinder, a waterproof ring, a cutterhead rotating shaft, an electrical system, an automatic control system, and auxiliary devices.

[0004] Since pipe jacking construction requires pushing pipe sections into the excavated tunnel at one time, in order to reduce the difficulty of pipe jacking construction and improve the safety of pipe jacking construction, pipe jacking construction generally adopts linear excavation operations. However, in some projects, multiple pipes need to be laid side by side, and the distance between adjacent pipes is relatively close. In addition, pipe jacking construction is carried out in silt geological formations. During the pipe jacking process, if the pipe deviates and cannot be corrected in time, it will squeeze the adjacent pipes, affecting the pipeline position and the connection between the pipes, resulting in a decline in the quality of pipeline construction. Therefore, it is necessary to effectively control the excavation direction of the machine head to prevent the machine head from deviating. Summary of the Invention

[0005] The present invention provides a silt pipe jacking method based on axial constraint, which aims to solve the problem that in construction environments with soft soil such as silt geology, the head of the pipe jacking machine system easily deviates from the preset direction, thereby causing a decrease in construction quality.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A silt pipe jacking method based on axial constraint includes a pipe jacking machine system. The pipe jacking machine system achieves precise control of the system's travel trajectory through the pipe jacking construction method. The pipe jacking machine system includes a machine head, a hydraulic propulsion mechanism, a soil conveying mechanism, a grouting mechanism, a measuring device, a ground hoisting device, and an electrical mechanism. The hydraulic propulsion mechanism is located in a sending well excavated at the construction location.

[0008] The pipe jacking machine system also includes a backrest, a cylinder frame connected to the front end of the backrest, and multiple cylinders arranged in the cylinder frame. The rear end of the backrest is abutted against and fixedly connected to the outer surface of the reinforced concrete structure of the inner wall of the sending shaft. A guide pipe is penetrated and pre-embedded in the reinforced concrete structure of the shaft wall on the side opposite to the backrest of the sending shaft. A machine head guide rail is provided between the rear end of the guide pipe and the front ends of the multiple cylinders.

[0009] The machine head guide rail cooperates with the guide mechanism in the guide tube and is used to input the machine head and a plurality of pipe sections to be laid into the guide tube; the rear end of the machine head is fixedly connected to the guide tube, the outer wall of the guide tube has a plurality of connecting seats evenly distributed around the axis, and the outer surface of the rear end of the guide tube is fixed with a plurality of rigid chain transmission boxes that cooperate with the connecting seats one by one;

[0010] The rigid chain transmission box is connected to the corresponding connecting seat through a rigid push-pull chain, and the portion of the rigid push-pull chain located in the guide tube is parallel to the axis of the guide tube;

[0011] The rigid push-pull chain can only bend to one side away from the axial direction of the guide tube, and has rigidity radially inward along the guide tube. Several rigid push-pull chains and the guide tube together constrain the machine head, the guide tube and several pipe sections connected to the rear end of the guide tube to move axially and make the offset range of the machine head controllable. The guide tube and the pipe sections, and the pipe sections themselves, are rigidly connected.

[0012] Preferably, the telescopic ends of the plurality of oil cylinders are commonly connected to a push ring, a plurality of pressure sensors are evenly distributed on the front end of the push ring, and the working ends of the plurality of pressure sensors are located on the same vertical plane and perpendicular to the axis of the push ring;

[0013] When the front end of the pushing ring presses the rear end of the last pipe section and several rigid push-pull chains tighten the guide pipe so that the guide pipe and each pipe section become an integral structure through tightening, and the pressure values ​​detected by each pressure sensor are consistent, the axis of the machine head overlaps with the axis of the pushing ring, guide pipe, pipe section, and guide pipe and is located within the preset straight excavation trajectory.

[0014] Preferably, the rigid chain transmission box includes a chain box, a coiled chain guide rail is provided in the chain box, the rigid push-pull chain is coiled in the guide rail and slidably cooperates with the guide rail, and a servo motor is provided outside the box wall on the output port side of the chain box;

[0015] The output shaft of the servo motor is provided with a sprocket, which is located in the chain box and is meshed with the rigid push-pull chain. The rigid push-pull chain bypasses the tensioning wheel located at the rear port of the guide tube and enters the guide mechanism inside the guide tube and is meshed with the transmission sprocket in the guide mechanism.

[0016] Preferably, the guide mechanism includes a plurality of guide units corresponding one to one with the rigid chain transmission boxes;

[0017] The guide unit includes a plurality of guide assemblies arranged parallel to the axial direction of the guide tube. The guide assemblies include two support plates arranged opposite to each other on the inner surface of the guide tube. A transverse axis passes through and is fixedly connected to the tops of the two support plates.

[0018] The two ends of the horizontal axis are respectively rotatably connected to rollers, and the outer wall of the horizontal axis located between the two support plates is rotatably connected to a transmission sprocket. Several transmission sprockets of the same guide unit are engaged and connected with the rigid push-pull chain in the input guide tube and limit the rigid push-pull chain to be parallel to the axis of the guide tube. The head of the rigid push-pull chain is detachably fixedly connected to the connecting seat.

[0019] Preferably, the outer surface of the pipe segment is provided with a guide rail mechanism used in conjunction with the guide mechanism, and the guide rail mechanism includes a plurality of guide rail units corresponding to the guide units one by one;

[0020] The guide rail unit includes a linear slide groove provided on the outer surface of the pipe segment in a direction parallel to the axis of the pipe segment. The linear slide groove cooperates with a plurality of rollers of the same guide unit. When the pipe segment enters the guide mechanism, the pipe segment and the guide tube are coaxial. The rigid push-pull chain is constrained between the outer surface of the pipe segment and the transmission sprocket and prevents it from detaching from the transmission sprocket.

[0021] The outer surface of the guide tube is also provided with a guide rail mechanism consistent with the tube segment structure.

[0022] Preferably, the front end of the pipe segment is provided with an annular protrusion, and the rear ends of the pipe segment and the guide tube are provided with an annular groove, and adjacent pipe segments or pipe segments and guide tubes are connected by inserting the annular protrusion into the annular groove;

[0023] A flange is fixedly provided between the groove walls of adjacent linear grooves on the outer surface of the pipe segment or guide tube and at the end of the pipe segment or guide tube. Several flanges are evenly distributed around the axis of the pipe segment or guide tube, and the flanges are provided with an axial stiffness constraint mechanism.

[0024] Preferably, the flange at the front end of the pipe segment is provided with a through hole, the flange at the rear end is provided with a threaded hole, the flange at the rear end of the guide pipe is also provided with a threaded hole, and the axis stiffness constraint mechanism includes a fixing seat fixedly provided on the front surface of the outer surface of the pipe segment;

[0025] The front end of the fixing seat is rotatably connected to a lead screw through a thrust bearing, the end of the lead screw is provided with a locking block, and the front end of the locking block is provided with a guide head;

[0026] The lead screw extends forward through the through hole and fits in the through hole gap. When adjacent pipe segments or the pipe segment and the guide tube are butted and pressed together through the annular groove and the annular protrusion, the front end of the lead screw enters the threaded hole of the adjacent front pipe segment and rotates under the pressure of the threaded hole and passes through the threaded hole. A telescopic sleeve structure is provided on the outer surface of the pipe segment in front of the threaded hole.

[0027] The telescopic sleeve structure includes a first sleeve fixed on the outer surface of the pipe joint, the open end of the first sleeve faces the side of the threaded hole, the second sleeve is slidably connected inside the first sleeve, a compression spring is connected between the bottom end of the second sleeve and the bottom of the first sleeve, and the open end of the first sleeve is provided with a locking hole that cooperates with the locking block.

[0028] Preferably, the cross-sections of the locking hole and the locking block are both regular polygons, and the outer edge size of the locking block is smaller than the outer diameter of the screw. When the locking block is matched with the locking hole, the relative flanges of the two adjacent pipe sections fit tightly.

[0029] Preferably, the pipe jacking construction method comprises the following steps:

[0030] (1) Dig a sending well and a receiving well at the construction location, cast a reinforced concrete structure on the wall of the sending well, and pre-bury a guide pipe according to a preset excavation linear trajectory. Set a hydraulic propulsion mechanism and a machine head guide rail on the opposite side of the guide pipe so that the height of the upper surface of the machine head guide rail matches the height of the roller at the bottom of the guide pipe, so as to facilitate the input of the machine head fixedly connected to the guide pipe and each pipe section into the guide mechanism of the guide pipe;

[0031] (2) The connecting seat of the guide tube is fixedly connected to the head of each rigid push-pull chain, and the head with the guide tube is pushed into the guide rail mechanism of the guide tube through the oil cylinder; and the pipe sections are lowered from the wellhead of the sending well in turn, and the pipe sections are pushed into the guide rail mechanism in turn;

[0032] When the pipe segment is connected to the guide pipe or when adjacent pipe segments are connected, the oil cylinder presses the rear end of the last pipe segment through the push ring, and each servo motor tightens the rigid push-pull chain. By adjusting the tension of each servo motor, the detection value of each pressure sensor is kept consistent within a certain error range. At this time, the excavation square of the machine head is adjusted so that the machine head is located within the pre-set straight excavation trajectory.

[0033] At the same time, the axial stiffness constraint mechanism connects the pipe segments and the pipe segments to the guide tubes into a rigid overall structure. When the rigid overall structure is formed, the guide tubes provide guidance to the rigid overall structure, further constraining the linear excavation trajectory along the axial direction of the guide tubes.

[0034] On this basis, the oil cylinder and servo motor cooperate to realize the step-by-step pushing and connecting of the pipe joints;

[0035] (3) When all the pipe sections are installed, fix the pipe sections in the receiving well and remove the machine head connected to the guide pipe. At the same time, remove the head of the rigid push-pull chain from the connecting seat, and each servo motor will be activated to retract the rigid push-pull chain into the chain box; remove the rigid chain transmission box from the guide pipe for next use.

[0036] The beneficial effects of the silt pipe jacking method based on axial constraint of the present invention are:

[0037] The present invention adjusts the excavation direction of the machine head and pipe segments based on the principle of mechanics. By setting an axial stiffness constraint mechanism, the machine head with a guide pipe and each pipe segment become an integral structure with rigidity during construction. On the one hand, the displacement of the travel trajectory caused by mutual misalignment is avoided. On the other hand, the guide pipe has a guiding and axial constraint effect on the overall structure. On this basis, a rigid chain transmission box is set to further constrain the axial direction of the pipe segment and the guide pipe by a number of rigid push-pull chains. In the process of advancing the pipe segment, the guide pipe is pulled by the servo motor to make the overall structure move during excavation. The consistent values ​​of each pressure sensor are used to judge whether the overall structure is excavating along the set axial direction, thereby achieving precise control of the overall travel trajectory of the machine head and pipe segments, and avoiding the settlement and displacement problem of the machine head and some pipe segments in a muddy geological environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0039] Figure 2 It is a schematic cross-sectional structural diagram of the guide tube of the present invention;

[0040] Figure 3 It is a schematic diagram of the local structure of A of the present invention;

[0041] Figure 4 1 is a front view structural diagram of the push ring of the present invention;

[0042] Figure 5 This is a front view structural diagram of the guide tube of the present invention (the tensioning pulley is omitted);

[0043] Figure 6 It is a schematic diagram of the local structure of B of the present invention;

[0044] 1—Sending well, 2—Sending well rear wall, 3—Sending well front wall, 4—Backrest, 5—Cylinder frame, 6—Pushing ring, 61—Pressure sensor, 7—Machine head guide rail, 8—Guide tube, 9—Rigid chain transmission box, 91—Chain box; 92—Servo motor; 93—Rigid push-pull chain; 94—Output port; 10—Pipe section, 101—Annular groove, 11—Guide tube, 12—Machine head, 13—Support plate, 14—Roller, 15—Linear slide, 16—Drive sprocket, 17—Tensioning pulley, 18—Connecting seat, 19—Fixed seat, 20—Thrust bearing, 21—Flange, 22—Second sleeve, 23—Screw; 24—Through hole, 25—Threaded hole, 26—Locking block, 27—Guide head; 28—First sleeve, 29—Compression spring, 30—Horizontal axis. DETAILED DESCRIPTION

[0045] The following describes in detail the implementation methods of the present invention in a step-by-step manner. This description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0046] In the description of the present invention, it should be noted that the terms "up", "down", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They are only for describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, and a specific orientation structure and operation. Therefore, they cannot be understood as limiting the present invention.

[0047] Example 1

[0048] Combine Figures 1 to 6 A silt pipe jacking method based on axial constraint includes a pipe jacking machine system. The pipe jacking machine system completes the precise control of the system's travel trajectory through the pipe jacking construction method. The pipe jacking machine system includes a machine head 12, a hydraulic propulsion mechanism, a soil conveying mechanism, a grouting mechanism, a measuring device, a ground hoisting device and an electrical mechanism, such as Figure 1 As shown, the hydraulic propulsion mechanism is arranged in a sending well 1 excavated at the construction location, including a backrest 4, a cylinder frame 5 connected to the front end of the backrest 4, and a plurality of cylinders arranged in the cylinder frame; part of the mechanical structure of the pipe jacking machine system of the present invention is the existing technical content, and the content not described is solved by the existing solution.

[0049] like Figure 1As shown, the rear end of the backrest 4 is abutted against and fixedly connected to the outer surface of the reinforced concrete structure of the inner wall of the sending well 1, and a guide tube 8 is penetrated and pre-buried in the reinforced concrete structure of the well wall on the side opposite to the backrest 4 of the sending well 1, and a machine head guide rail 7 is provided between the rear end of the guide tube 8 and the front ends of multiple oil cylinders. The machine head guide rail 7 cooperates with the guide mechanism in the guide tube 8 and is used to input the machine head 12 and several pipe sections 10 to be laid into the guide tube 8.

[0050] The machine head guide rail is a commonly used technology with an arc-shaped top surface. Its function is to facilitate the guidance of the machine head and pipe segment along the excavation trajectory. The present invention provides a guide tube 8 based on this. The function of the guide tube 8 is to: on the one hand, continue to guide the machine head and pipe segment; on the other hand, to achieve an axial restraint effect on the machine head and pipe segment, thereby preventing the excavation direction of the machine head from deviating.

[0051] like Figure 1 As shown, the rear end of the machine head 12 is fixedly connected to a guide tube 11, and a plurality of connecting seats 18 are evenly distributed on the outer wall of the guide tube 11 around the axis. The outer surface of the rear end of the guide tube 8 is fixed with a plurality of rigid chain transmission boxes 9 that match the connecting seats 18 one by one.

[0052] The rigid chain transmission box 9 is connected to the corresponding connecting seat 18 through a rigid push-pull chain 93. The part of the rigid push-pull chain 93 located in the guide tube 8 is parallel to the axis of the guide tube 11. The rigid push-pull chain 93 can only bend to the side away from the axial direction of the guide tube 8, and has rigidity inward along the radial direction of the guide tube 8. Several rigid push-pull chains 93 and the guide tube 8 together constrain the machine head 12, the guide tube 11 and several pipe sections 10 connected to the rear end of the guide tube 11 to move axially and make the offset range of the machine head 12 controllable. The guide tube and the pipe sections, and the pipe sections 10 are rigidly connected.

[0053] Since the guide pipe 11 is fixedly connected to the machine head 12, adjusting the position of the guide pipe 11 is equivalent to adjusting the excavation direction of the machine head 12. Due to the rigid connection between the pipe sections 10 and between the guide pipe and the pipe sections 10, the machine head or part of the pipe sections is prevented from settling and deviating in the muddy terrain during the excavation process.

[0054] Furthermore, the guide tube ensures the axial positional constraint of the integral rigid structure formed by the machine head, guide tube, and pipe segments. This constraint on the pipe segments within the guide tube is transmitted to the machine head via a force transfer effect. The rigid push-pull chain pulling the guide tube, combined with the compression of the pipe segments by several hydraulic cylinders, combined with the guide tube's positional constraint on the integral rigid structure, allows the machine head's excavation trajectory to be corrected, preventing deviation during excavation.

[0055] Example 2

[0056] like Figure 1 、 4 As shown, the telescopic ends of several oil cylinders are commonly connected to a push ring 6. Multiple pressure sensors 61 are evenly distributed on the front end of the push ring 6. The working ends of these pressure sensors are located on the same vertical plane and perpendicular to the axis of the push ring. When the front end of the push ring 6 presses against the rear end of the last pipe section 10, and several rigid push-pull chains 93 tighten the guide tube 11, forming a single unit with each pipe section 10, and the pressure values ​​detected by each pressure sensor 61 are consistent, the axis of the machine head 12 overlaps with the axes of the push ring 6, guide tube 8, pipe section 10, and guide tube 11, and lies within the pre-set straight excavation trajectory.

[0057] This embodiment provides a method for correcting the tunneling trajectory, the principle of which is:

[0058] When the axis of the machine head 12 overlaps with the axis of the push ring 6, guide tube 8, pipe section 10, and guide tube 11 and is located within the preset straight excavation trajectory, it means that the common axis is located on a preset horizontal straight line. Since the working ends of the multiple pressure sensors 61 are located on the same vertical plane and are perpendicular to the axis of the push ring (the axis direction of the push ring is also the extension and contraction direction of the oil cylinder), the multiple pressure sensors 61 should be in uniform contact with the vertical plane of the rear end of the last pipe section (the vertical planes of the front and rear ends should be perpendicular to their axis when the pipe sections are prefabricated in the factory). Therefore, the pressure values ​​detected by the multiple pressure sensors are consistent. Taking into account the errors in actual construction, the pressure values ​​detected are set to be consistent within a certain error range, which means that the machine head is located within the preset excavation trajectory.

[0059] It should be pointed out that the present invention corrects the excavation direction of the machine head based on the principles of mechanics, which is different from the conventional method of finding the axial positioning point through laser irradiation. The latter has certain technical obstacles. For example, when the silt guide pipe or other pipelines in the pipe section block the laser line, this positioning will fail.

[0060] More importantly, the present invention solves the settlement problem that may exist in muddy terrain. In actual construction, settlement may occur at the machine head position or at one or more pipe joint positions (if the pipe joint settles significantly, the laser line will not be able to find the receiving point, and the positioning will fail). Therefore, the present invention integrates the machine head and the pipe joint into a whole through the pushing of the oil cylinder and the traction and constraint of the rigid chain, thereby realizing the trajectory adjustment of the overall structure.

[0061] Example 3

[0062] like Figure 1 、 2As shown in Figures 5 and 6, the rigid chain transmission box includes a chain box 91, which is provided with a coiled chain guide rail. The rigid push-pull chain 93 is coiled within the guide rail and slides with the guide rail. A servo motor is provided on the outer wall of the chain box 91 on the side of the output port 94. The output shaft of the servo motor is provided with a sprocket. The sprocket is located within the chain box and meshes with the rigid push-pull chain 93. The rigid push-pull chain 93 bypasses the tensioning pulley 17 provided at the rear end of the guide tube 8, enters the guide mechanism inside the guide tube 8, and meshes with the transmission sprocket 16 within the guide mechanism.

[0063] The rigid push-pull chain described herein can be any conventional rigid chain capable of performing the chain's functions. The specific structure of the rigid chain transmission case can be found in patent application number CN202210808055.X, titled "A Block-Locked Rigid Chain Push-Pull Actuator." This invention does not specifically discuss the related structure.

[0064] Example 4

[0065] like Figure 1 、 2 As shown in Figures 5 and 6, the guide mechanism includes several groups of guide units corresponding to the rigid chain transmission boxes 9 one by one, and the guide units include several guide assemblies arranged along the axis parallel to the guide tube 8, and the guide assemblies include two support plates 13 relatively arranged on the inner surface of the guide tube. A transverse shaft 30 passes through and is fixedly connected between the tops of the two support plates 13, and rollers 14 are rotatably connected to the two ends of the transverse shaft 30 respectively. A transmission sprocket 16 is rotatably connected to the outer wall of the transverse shaft 30 located between the two support plates 13, and several transmission sprockets 16 of the same guide unit are engaged with the rigid push-pull chain 93 in the input guide tube 8 and limit the rigid push-pull chain 93 to be parallel to the axis of the guide tube 8. The head of the rigid push-pull chain 93 is detachably fixedly connected to the connecting seat 18.

[0066] like Figure 1 、 2 As shown in Figures 5 and 6, the outer surface of the pipe segment 10 is provided with a guide rail mechanism for use in conjunction with the guide mechanism. The guide rail mechanism includes a plurality of guide rail units corresponding one to one with the guide units. The guide rail units include linear slides 15 provided on the outer surface of the pipe segment 10 in a direction parallel to the axis of the pipe segment 10. The linear slides 15 cooperate with a plurality of rollers 14 of the same guide unit. When the pipe segment 10 enters the guide mechanism, the pipe segment 10 and the guide tube 8 become coaxial, and the rigid push-pull chain 13 is constrained between the outer surface of the pipe segment 10 and the drive sprocket 16, preventing it from detaching from the drive sprocket 16. The outer surface of the guide tube is also provided with a guide rail mechanism consistent with the pipe segment structure.

[0067] In this embodiment, the constraints of the pipe segments and the transmission sprocket ensure that the rigid push-pull chain in the guide tube is coaxial with the guide tube and the pipe segments and will not be separated from the transmission sprocket, thereby ensuring that when the rigid push-pull chain is tightened, the force applied to the guide tube and the pipe segments is parallel to the common axis, so that the traction force of the rigid push-pull chain has a machine head guiding effect.

[0068] Example 5

[0069] like Figure 1 、 3 As shown in Figures 5 and 6, the front end of the pipe segment 10 is provided with an annular protrusion (a commonly used structure, not shown), and the rear ends of the pipe segment 10 and the guide tube 11 are provided with an annular groove 101. Adjacent pipe segments 10 or pipe segments and guide tubes are connected by inserting the annular protrusion into the annular groove 101.

[0070] A flange 21 is fixedly mounted between the walls of adjacent linear grooves 15 on the outer surface of the pipe segment or guide tube, and at the end of the pipe segment 10 or guide tube. Several flanges 21 are evenly distributed around the axis of the pipe segment 10 or guide tube, and each flange 21 is equipped with an axial rigidity constraint mechanism. This axial rigidity constraint mechanism ensures axial rigidity between the guide tube and the pipe segment, and between the pipe segments, preventing them from staggering, thereby ensuring the guide tube's axial constraint on the overall rigidity of the structure.

[0071] Example 6

[0072] like Figure 1 、 3 As shown in Figures 5 and 6, the flange at the front end of the pipe section 10 is provided with a through hole 24, the flange 21 at the rear end is provided with a threaded hole 25, and the flange at the rear end of the guide tube is also provided with a threaded hole. The axis stiffness constraint mechanism includes a fixed seat 19 fixed to the front surface of the outer surface of the pipe section 10, and the front end of the fixed seat 19 is rotatably connected to a screw 23 through a thrust bearing 20. The end of the screw 23 is provided with a locking block 26, and the front end of the locking block 26 is provided with a guide head 27.

[0073] The lead screw 23 extends forward through the through hole and is loosely engaged with the through hole 24. When adjacent pipe segments 10 or between a pipe segment and a guide tube are butted and pressed together via the annular groove and the annular protrusion, the front end of the lead screw 23 enters the threaded hole 25 of the adjacent front pipe segment and rotates under the pressure of the threaded hole 25 and passes through the threaded hole 25. A telescopic sleeve structure is provided on the outer surface of the pipe segment 10 in front of the threaded hole 25. The telescopic sleeve structure includes a first sleeve 28 fixedly mounted on the outer surface of the pipe segment 10, with the open end of the first sleeve 28 facing the threaded hole 25. A second sleeve 22 is slidably connected within the first sleeve 28. A compression spring 29 is connected between the bottom end of the second sleeve 22 and the inner bottom of the first sleeve 28. The open end of the first sleeve 28 is provided with a locking hole that engages with a locking block.

[0074] The cross-sections of the locking hole and the locking block 26 are both regular polygons, and the outer edge size of the locking block 26 is smaller than the outer diameter of the screw 23 ( Figure 3 The case where the two have the same size is given in the embodiment. This embodiment provides an optimization method, the purpose of which is to facilitate the direct engagement of the lead screw with the threaded hole). When the locking block 26 engages with the locking hole, the relative flanges 21 of the two adjacent pipe sections 10 fit tightly.

[0075] In this embodiment, based on the principle of a ball screw, when the threaded hole squeezes the lead screw, the lead screw passes through the threaded hole, and the guide head 27 first enters the locking hole. During the screw's rotation and advancement, the locking block enters the locking hole and is locked by the locking hole, thereby preventing the lead screw from rotating. At this time, the relative flanges 21 of two adjacent pipe sections 10 are tightly fitted, achieving axial rigidity and connection between adjacent pipe sections and between the pipe section and the guide tube, thereby ensuring the guide tube's axial constraint effect on the overall rigid structure. Furthermore, the common axial constraints of multiple rigid chains also play a role, achieving adjustment of the machine head trajectory by pulling the guide tube. Because the locking block cannot rotate within the locking hole, it restricts the lead screw from rotating relative to the threaded hole.

[0076] Example 7

[0077] A construction method of a pipe jacking machine system based on axial constraints, such as Figure 1-6 As shown, the following steps are included:

[0078] (1) A sending well and a receiving well are excavated at the construction site, a reinforced concrete structure is cast on the wall of the sending well, and a guide pipe 8 is pre-buried according to a preset excavation straight line trajectory. A hydraulic propulsion mechanism and a machine head guide rail are set on the opposite side of the guide pipe 8 so that the height of the upper surface of the machine head guide rail matches the height of the roller at the bottom of the guide pipe, so as to facilitate the input of the machine head 12 fixedly connected to the guide pipe and each pipe segment 10 into the guide mechanism of the guide pipe 8.

[0079] (2) The connecting seat 18 of the guide tube 11 is fixedly connected to the head of each rigid push-pull chain 93, and the head 12 with the guide tube is pushed into the guide rail mechanism of the guide tube 8 through the oil cylinder; and the pipe section 10 is lowered from the wellhead of the sending well in turn, and the pipe section 10 is pushed into the guide rail mechanism in turn.

[0080] When the pipe section is connected to the guide pipe or when adjacent pipe sections are connected, the oil cylinder presses the rear end of the last pipe section through the pushing ring, and each servo motor tightens the rigid push-pull chain. By adjusting the tension of each servo motor, the detection values ​​of each pressure sensor are kept consistent within a certain error range; at this time, the excavation square of the machine head is adjusted so that the machine head is located within the pre-set straight excavation trajectory.

[0081] At the same time, the axis stiffness constraint mechanism connects each pipe segment and between the pipe segment and the guide pipe into a rigid overall structure. When it becomes a rigid overall structure, the guide pipe provides a guiding effect on the rigid overall structure, and further constrains the linear excavation trajectory along the axial direction of the guide pipe. On this basis, the oil cylinder and the servo motor cooperate to realize the step-by-step pushing and connecting of the pipe segment.

[0082] The mutual coordination here means that the oil cylinder applies uniform pressure through the push ring while the servo motor releases the rigid push-pull chain, so that the overall structure is advanced along the preset trajectory. The speed at which the servo motor releases the rigid push-pull chain matches the advancement speed of the oil cylinder. The detection values ​​of each pressure sensor remain consistent within a certain error range, thereby ensuring that the overall structure is advanced along the preset trajectory.

[0083] (3) When all the pipe sections 10 are installed, fix the pipe sections in the receiving well and remove the machine head connected to the guide pipe. At the same time, remove the head of the rigid push-pull chain 93 from the connecting seat 18, and each servo motor is activated to retract the rigid push-pull chain into the chain box 91; remove the rigid chain transmission box 9 from the guide pipe 8 for next use.

[0084] The present invention adjusts the excavation direction of the machine head and pipe segments as a whole based on the principles of mechanics. By setting an axial stiffness constraint mechanism, the machine head with a guide pipe and each pipe segment become an integral structure with rigidity during construction. On the one hand, this avoids the deviation of the travel trajectory caused by mutual misalignment, and on the other hand, the guide pipe has a guiding and axial constraint effect on the overall structure.

[0085] On this basis, by setting up a rigid chain transmission box, several rigid push-pull chains further constrain the axial direction of the pipe segment and the guide pipe. By cooperating with the servo motor to pull the guide pipe during the process of advancing the pipe segment, the overall structure is excavated and moved. The consistent values ​​of each pressure sensor are used to judge whether the overall structure is excavating along the set axial direction, thereby achieving precise control of the overall travel trajectory of the machine head and pipe segment, avoiding the settlement and deviation problem of the machine head and part of the pipe segment in the muddy geological environment.

Claims

1. A silt pipe jacking method based on axial constraint, comprising a pipe jacking machine system. The pipe jacking machine system achieves precise control of the system's travel trajectory through the pipe jacking construction method. The pipe jacking machine system includes a machine head, a hydraulic propulsion mechanism, a soil conveying mechanism, a grouting mechanism, a measuring device, a ground hoisting device, and an electrical mechanism. The hydraulic propulsion mechanism is located in a launch well excavated at the construction site. The method is characterized by: The pipe jacking machine system also includes a backrest, a cylinder frame connected to the front end of the backrest, and multiple cylinders arranged in the cylinder frame. The rear end of the backrest is abutted against and fixedly connected to the outer surface of the reinforced concrete structure of the inner wall of the sending shaft. A guide pipe is penetrated and pre-embedded in the reinforced concrete structure of the shaft wall on the side opposite to the backrest of the sending shaft. A machine head guide rail is provided between the rear end of the guide pipe and the front ends of the multiple cylinders. The machine head guide rail cooperates with the guide mechanism in the guide tube and is used to input the machine head and a plurality of pipe sections to be laid into the guide tube; the rear end of the machine head is fixedly connected to the guide tube, the outer wall of the guide tube has a plurality of connecting seats evenly distributed around the axis, and the outer surface of the rear end of the guide tube is fixed with a plurality of rigid chain transmission boxes that cooperate with the connecting seats one by one; The rigid chain transmission box is connected to the corresponding connecting seat through a rigid push-pull chain, and the portion of the rigid push-pull chain located in the guide tube is parallel to the axis of the guide tube; The rigid push-pull chain can only bend to one side away from the axial direction of the guide tube, and has rigidity radially inward along the guide tube. Several rigid push-pull chains and the guide tube together constrain the machine head, the guide tube and several pipe sections connected to the rear end of the guide tube to move axially and make the offset range of the machine head controllable. The guide tube and the pipe sections, and the pipe sections themselves, are rigidly connected.

2. The silt pipe jacking method based on axial constraint according to claim 1, characterized in that: The telescopic ends of the plurality of oil cylinders are commonly connected to a push ring, and a plurality of pressure sensors are evenly distributed on the front end of the push ring. The working ends of the plurality of pressure sensors are located on the same vertical plane and are perpendicular to the axis of the push ring. When the front end of the pushing ring presses the rear end of the last pipe section and several rigid push-pull chains tighten the guide pipe so that the guide pipe and each pipe section become an integral structure through tightening, and the pressure values ​​detected by each pressure sensor are consistent, the axis of the machine head overlaps with the axis of the pushing ring, guide pipe, pipe section, and guide pipe and is located within the preset straight excavation trajectory.

3. The silt pipe jacking method based on axial constraint according to claim 2, characterized in that: The rigid chain transmission box includes a chain box, a coiled chain guide rail is provided in the chain box, the rigid push-pull chain is coiled in the guide rail and slidably cooperates with the guide rail, and a servo motor is provided outside the box wall on the output side of the chain box; The output shaft of the servo motor is provided with a sprocket, which is located in the chain box and is meshed with the rigid push-pull chain. The rigid push-pull chain bypasses the tensioning wheel located at the rear port of the guide tube and enters the guide mechanism inside the guide tube and is meshed with the transmission sprocket in the guide mechanism.

4. A silt pipe jacking method based on axial constraint according to claim 3, characterized in that: the guide mechanism comprises a plurality of guide units corresponding one-to-one with the rigid chain transmission boxes; The guide unit includes a plurality of guide assemblies arranged parallel to the axial direction of the guide tube. The guide assemblies include two support plates arranged opposite to each other on the inner surface of the guide tube. A transverse axis passes through and is fixedly connected to the tops of the two support plates. The two ends of the horizontal axis are respectively rotatably connected to rollers, and the outer wall of the horizontal axis located between the two support plates is rotatably connected to a transmission sprocket. Several transmission sprockets of the same guide unit are engaged and connected with the rigid push-pull chain in the input guide tube and limit the rigid push-pull chain to be parallel to the axis of the guide tube. The head of the rigid push-pull chain is detachably fixedly connected to the connecting seat.

5. The silt pipe jacking method based on axial constraint according to claim 4, characterized in that: The outer surface of the pipe section is provided with a guide rail mechanism used in conjunction with the guide mechanism, and the guide rail mechanism includes a plurality of guide rail units corresponding to the guide units one by one; The guide rail unit includes a linear slide groove provided on the outer surface of the pipe segment in a direction parallel to the axis of the pipe segment. The linear slide groove cooperates with a plurality of rollers of the same guide unit. When the pipe segment enters the guide mechanism, the pipe segment and the guide tube are coaxial. The rigid push-pull chain is constrained between the outer surface of the pipe segment and the transmission sprocket and prevents it from detaching from the transmission sprocket. The outer surface of the guide tube is also provided with a guide rail mechanism consistent with the tube segment structure.

6. The silt pipe jacking method based on axial constraint according to claim 5, characterized in that: The front end of the pipe segment is provided with an annular protrusion, and the rear ends of the pipe segment and the guide tube are provided with an annular groove. Adjacent pipe segments or pipe segments and guide tubes are connected by inserting the annular protrusion into the annular groove. A flange is fixedly provided between the groove walls of adjacent linear grooves on the outer surface of the pipe segment or guide tube and at the end of the pipe segment or guide tube. Several flanges are evenly distributed around the axis of the pipe segment or guide tube, and the flanges are provided with an axial stiffness constraint mechanism.

7. The silt pipe jacking method based on axial constraint according to claim 6, characterized in that: The flange at the front end of the pipe joint is provided with a through hole, the flange at the rear end is provided with a threaded hole, and the flange at the rear end of the guide pipe is also provided with a threaded hole. The axis stiffness constraint mechanism includes a fixing seat fixed to the front surface of the outer surface of the pipe joint; The front end of the fixing seat is rotatably connected to a lead screw through a thrust bearing, the end of the lead screw is provided with a locking block, and the front end of the locking block is provided with a guide head; The lead screw extends forward through the through hole and fits in the through hole gap. When adjacent pipe segments or the pipe segment and the guide tube are butted and pressed together through the annular groove and the annular protrusion, the front end of the lead screw enters the threaded hole of the adjacent front pipe segment and rotates under the pressure of the threaded hole and passes through the threaded hole. A telescopic sleeve structure is provided on the outer surface of the pipe segment in front of the threaded hole. The telescopic sleeve structure includes a first sleeve fixed on the outer surface of the pipe joint, the open end of the first sleeve faces the side of the threaded hole, the second sleeve is slidably connected inside the first sleeve, a compression spring is connected between the bottom end of the second sleeve and the bottom of the first sleeve, and the open end of the first sleeve is provided with a locking hole that cooperates with the locking block.

8. The silt pipe jacking method based on axial constraint according to claim 7, characterized in that: The cross-sections of the locking hole and the locking block are both regular polygons. The outer edge size of the locking block is smaller than the outer diameter of the screw. When the locking block is matched with the locking hole, the relative flanges of the two adjacent pipe sections fit tightly.

9. The silt pipe jacking method based on axial constraint according to claim 8, characterized in that: The pipe jacking construction method comprises the following steps: (1) Dig a sending well and a receiving well at the construction location, cast a reinforced concrete structure on the wall of the sending well, and pre-bury a guide pipe according to a preset excavation linear trajectory. Set a hydraulic propulsion mechanism and a machine head guide rail on the opposite side of the guide pipe so that the height of the upper surface of the machine head guide rail matches the height of the roller at the bottom of the guide pipe, so as to facilitate the input of the machine head fixedly connected to the guide pipe and each pipe section into the guide mechanism of the guide pipe; (2) The connecting seat of the guide tube is fixedly connected to the head of each rigid push-pull chain, and the head with the guide tube is pushed into the guide rail mechanism of the guide tube through the oil cylinder; and the pipe sections are lowered from the wellhead of the sending well in turn, and the pipe sections are pushed into the guide rail mechanism in turn; When the pipe segment is connected to the guide pipe or when adjacent pipe segments are connected, the oil cylinder presses the rear end of the last pipe segment through the push ring, and each servo motor tightens the rigid push-pull chain. By adjusting the tension of each servo motor, the detection value of each pressure sensor is kept consistent within a certain error range. At this time, the excavation square of the machine head is adjusted so that the machine head is located within the pre-set straight excavation trajectory. At the same time, the axial stiffness constraint mechanism connects the pipe segments and the pipe segments to the guide tubes into a rigid overall structure. When the rigid overall structure is formed, the guide tubes provide guidance to the rigid overall structure, further constraining the linear excavation trajectory along the axial direction of the guide tubes. On this basis, the oil cylinder and servo motor cooperate to realize the step-by-step pushing and connecting of the pipe joints; (3) When all the pipe sections are installed, fix the pipe sections in the receiving well and remove the machine head connected to the guide pipe. At the same time, remove the head of the rigid push-pull chain from the connecting seat, and each servo motor will be activated to retract the rigid push-pull chain into the chain box; remove the rigid chain transmission box from the guide pipe for next use.

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