Quick locking and retracting device for jacking iron of jacking pipe

Abstract

The invention relates to the technical field of pipe jacking construction, and provides a pipe jacking jacking iron rapid locking and retracting device which comprises a jacking mechanism and O-shaped jacking iron, the jacking mechanism comprises a plurality of jacking jacks, and the ends of jacking piston rods of the jacking jacks are connected with end sockets; a clamping ring is arranged at one end, corresponding to the jacking jack, of the O-shaped jacking iron, a clamping assembly is arranged in the clamping ring, and the clamping assembly comprises a mounting groove, a buckling piece and an elastic piece. When the end of the jacking jack extends into the clamping ring, the buckling piece and the elastic piece are pressed to enter the mounting groove, and when the end of the jacking jack moves to the clamping gap, the elastic piece drives the buckling piece to reset and clamp the end. The clamping ring is further provided with a limiting mechanism used for limiting retraction of the elastic piece. The limiting mechanism comprises a limiting base, a limiting ratchet wheel, a limiting pawl and a limiting driving piece. The pipe-jacking jacking iron and the jacking jack can be rapidly and stably connected, and the effect that in the pipe-jacking construction process, the O-shaped jacking iron needs to be frequently and secondarily hoisted is effectively improved.

Description

Technical Field

[0001] This application relates to the technical field of pipe jacking construction, and in particular to a quick locking and shrinking device for the top iron of a pipe jacking project. Background Technology

[0002] In pipe jacking construction, the jacking iron is used to evenly transfer the jacking load applied by the jacking jacks to the pipe to be jacked.

[0003] In current technology, a jacking iron device for pipe jacking construction (Publication No.: CN219571055U, Publication Date: 2023.08.25) and a jacking iron for pipe jacking (Publication No.: CN216583969U, Publication Date: 2022.05.24) are mainly improvements on O-type and U-type jacking irons, but both have certain drawbacks. For example, in Publication No. CN219571055U, multiple U-type jacking irons with a thickness of 0.5m can be arranged in a straight line to extend the service length, but stress concentration is prone to occur during long-term jacking, leading to pipe end damage or annular cracks. Publication No. CN216583969U consists of an arc-shaped front plate and a rear plate, with a supporting frame connected in the middle. Its advantage is to increase the contact area with the pipe and prevent pipe breakage, but the overall structure is heavy and inconvenient to transport.

[0004] After each type of jacking block completes one stroke of jacking, it must first be lifted out of the narrow space between the jacking jack and the pipe using lifting equipment. After the jacking jack retracts and resets, the pipe segment to be constructed is lifted and placed again, and then reinstalled using lifting equipment to carry out the next stroke of jacking operation.

[0005] Regarding the aforementioned technologies, during pipe jacking construction, O-shaped jacking blocks require frequent disassembly, assembly, and secondary hoisting, which severely affects the continuity of construction and results in relatively low efficiency in pipe jacking operations. Furthermore, the jacking blocks rely entirely on the continuous thrust of the jacking jacks to maintain the pipe position throughout the entire jacking system. If the hydraulic system malfunctions or experiences a momentary loss of pressure, the jacking blocks are prone to displacement, potentially leading to safety accidents. Therefore, there is room for improvement. Summary of the Invention

[0006] To facilitate a quick and stable connection between the jacking jack and the O-shaped jacking iron, and to improve the situation where the O-shaped jacking iron needs to be frequently disassembled and re-lifted during the jacking construction process, this application provides a quick locking and retraction device for the jacking iron.

[0007] This application provides a rapid locking and shrinking device for pipe jacking and top iron, which adopts the following technical solution: A quick-locking and retracting device for pipe jacking includes a jacking mechanism and an O-shaped top iron; The jacking mechanism includes a plurality of jacking jacks, each jacking jack including a jacking piston rod, the end of which is connected to a head, the outer diameter of which is larger than the outer diameter of the jacking piston rod; One end of the O-ring is provided with a retaining ring corresponding to several of the jacking jacks. The retaining ring is used for the end of the jacking piston rod to extend into. Each retaining ring is provided with a snap-fit ​​assembly, which includes several mounting grooves evenly formed on the inner circumference of the retaining ring. A snap-fit ​​element is provided in each mounting groove, and the snap-fit ​​element and the O-ring are provided with a snap-fit ​​gap. The width of the snap-fit ​​gap is greater than the thickness of the end, and the end of the snap-fit ​​element facing the O-ring is used for the end to abut against it. A guide slope is formed on the axial side of the snap-fit ​​element facing the retaining ring, and the distance between the guide slope and the axial direction of the retaining ring gradually increases from the direction closer to the O-ring to the direction farther away from the O-ring. An elastic element is provided in each mounting groove, and the elastic element is used to drive the snap-fit ​​element out of the mounting groove. When the jacking jack drives the jacking piston rod to move the end head into the inner cavity of the retaining ring, the retaining member is pressed into the mounting groove; when the jacking jack drives the jacking piston rod to move the end head to the locking gap, the elastic member drives the retaining member to reset, so as to lock the end head of the jacking piston rod.

[0008] By adopting the above technical solution, when the jacking jack drives the end of the jacking piston rod into the inner cavity of the retaining ring, the retaining element is compressed and retracts into the mounting groove. After the end is fully inserted and abuts against the O-ring, the elastic element drives the retaining element to pop out and engage in the engagement gap formed between the end and the piston rod. The jacking jack is engaged and limited by several retaining elements. On the one hand, when the jacking jack is jacking in and out, it can drive the O-ring to move together. Compared with the traditional construction method, there is no need to frequently disassemble and hoist the O-ring, which effectively improves the overall construction efficiency of pipe jacking. On the other hand, it achieves a stable connection between the O-ring and the jacking jack, limiting the O-ring from slipping and shifting when the jacking jack experiences a pressure loss failure.

[0009] Preferably, the elastic element includes a plurality of support springs disposed in the mounting groove, with both ends of the support springs respectively connected to the bottom wall of the mounting groove and the side of the buckle opposite to the axial direction of the buckle ring.

[0010] By adopting the above technical solution, when the piston rod of the jacking jack drives the end to extend into the retaining ring, the pressurized retaining member retracts into the mounting groove. When the end moves into place, the retaining member is reset and popped out by the support spring to lock and limit the end of the jacking jack.

[0011] Preferably, the end of the fastener away from the O-ring top iron is hinged to the end of the mounting groove away from the O-ring top iron; the support spring is connected to the fastener via a connecting block; The retaining ring is provided with a limiting component, which is used to restrict the retraction of the support spring; The limiting member is located in the mounting groove and is positioned close to the O-ring top iron. The limiting member includes a limiting seat, a limiting ratchet, a limiting pawl, and a limiting drive. The limiting ratchet is rotatably connected to the limiting seat. The limiting pawl is connected to the connecting block and engages with the tooth gap of the limiting ratchet to limit the support spring and restrict its compression. The limiting drive is used to drive the limiting seat to move in a direction perpendicular to the axial direction of the limiting ratchet.

[0012] By adopting the above technical solution, when the jacking jack drives the jacking piston rod to extend the end into the inner cavity of the retaining ring, the limiting drive component drives the limiting seat to move the limiting ratchet away from the limiting pawl on the connecting block, so as to release the limitation on the support spring, allowing the buckle and the support spring to swing under pressure into the mounting groove; when the end of the jacking piston rod of the jacking jack moves into place, the limiting drive component drives the limiting seat to move the limiting ratchet closer to the connecting block, so that the limiting pawl engages with the tooth gap of the limiting ratchet, thereby limiting the compression of the support spring due to external force, which is conducive to the buckle cooperating to stably limit the end of the jacking jack.

[0013] Preferably, the O-ring is provided with a pressure feedback component corresponding to the retaining ring. The pressure feedback component includes a pressure sensor and an alarm. The pressure sensor is located in the inner cavity of the retaining ring. The O-ring is provided with a controller. The pressure sensor and the alarm are both electrically connected to the controller. The pressure sensor is used to obtain the jacking force of the jacking jack and feed it back to the controller.

[0014] By adopting the above technical solution, when jacking the pipeline with jacking jacks and O-shaped jacking irons, the pressure sensor located in the retaining ring can monitor the jacking force of each jacking jack in real time. When an abnormal jacking force is detected, the controller can trigger an alarm to reduce the possibility of damage to the pipeline end caused by excessive jacking force due to soil fluctuations at the tunnel face during the jacking process.

[0015] Preferably, all the jacking jacks are electrically connected to the controller; When the controller detects that the jacking force of the jacking jack exceeds the limit through the pressure sensor, the controller controls the jacking jack to adjust the jacking force.

[0016] By adopting the above technical solution, the stress of the jacking jack can be adjusted in real time, which helps to ensure that the O-shaped jacking iron and the jacking pipe are subjected to uniform force.

[0017] Preferably, the retaining ring is provided with a limiting component, which is used to restrict the retraction of the support spring; The limiting component includes a supporting hydraulic cylinder disposed on the outside of the retaining ring. The piston rod of the supporting hydraulic cylinder passes through the retaining ring and extends into the mounting groove, and the end of the piston rod of the supporting hydraulic cylinder is disposed opposite to the buckling component located in the mounting groove.

[0018] By adopting the above technical solution, when the fastener pops out through the support spring to lock and limit the end inside the snap ring, the corresponding piston rod is driven by the support hydraulic cylinder to extend and abut against the fastener in the mounting groove to support and limit the fastener. During the subsequent jacking construction, the support spring of the fastener can be prevented from retracting due to severe external vibration or impact load, which would affect the locking of the end of the jacking jack.

[0019] Preferably, the piston rod end of the supporting hydraulic cylinder is connected to an electromagnet. When the electromagnet is energized and abuts against the buckle, the electromagnet and the buckle are magnetically connected.

[0020] By adopting the above technical solution, when the electromagnet is used to support and limit the support spring of the buckle, the electromagnet is driven by the support hydraulic cylinder to abut against the buckle. When it is necessary to separate the jacking jack and the O-ring, the electromagnet can magnetically fix the buckle, and the support hydraulic cylinder can drive the piston rod to retract the buckle into the mounting groove, so that the jacking jack can drive the piston rod to disengage from the retaining ring.

[0021] Preferably, a plurality of limiting hydraulic cylinders are arranged around the outer side of the retaining ring, the piston rods of the limiting hydraulic cylinders are all inserted through the retaining ring, and the piston rods of the limiting hydraulic cylinders are all oriented towards the retaining gap.

[0022] By adopting the above technical solution, when the jacking jack drives the O-ring to retract, the piston rod of the jacking jack can be driven by the limiting hydraulic cylinder to extend into and press against the outer periphery of the end of the jacking jack. The end of the jacking jack is clamped and limited by several limiting hydraulic cylinders, which prevents the load from being concentrated on the fastening parts when the jacking jack retracts to its original position, thus preventing the fastening parts from being easily deformed and damaged.

[0023] In summary, this application includes at least one of the following beneficial technical effects: 1. By setting the limiting component at the retaining ring, when the jacking jack drives the piston rod to extend the end into the retaining ring cavity and makes the end position in the retaining gap inside the retaining ring, several buckles that extend through the installation groove through elastic elements are used to retain the end, so as to achieve a stable connection between the jacking jack and the O-ring. When the jacking jack is advancing and retracting, it can drive the O-ring to move together, eliminating the need for frequent hoisting of the O-ring and improving the overall construction efficiency of pipe jacking.

[0024] 2. By setting up a supporting hydraulic cylinder, when the jacking jack is used in conjunction with the O-ring for jacking operations, the supporting hydraulic cylinder can drive the electromagnet to abut against the buckling component to support and limit the buckling component, so that the buckling component can more firmly lock and limit the end of the jacking jack.

[0025] 3. By setting up limit hydraulic cylinders, several limit hydraulic cylinders work together to clamp and limit the top head of the jack located in the retaining ring. This helps to prevent the load from being concentrated on several fastening parts when the jack retracts, thus preventing the fastening parts from being easily damaged. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the jacking mechanism and the O-shaped jacking iron used in Embodiment 1.

[0027] Figure 2 This is a schematic diagram of the structure of the O-ring and retaining ring used in Embodiment 1. Figure 3 This is a schematic diagram of the internal structure of the retaining ring used in Embodiment 1.

[0028] Figure 4 This is a schematic diagram of the structure of the limiting component used in Embodiment 1.

[0029] Figure 5 This is a schematic diagram of the connection between the jacking jack and the O-shaped jack in Embodiment 2.

[0030] Figure 6 yes Figure 5 Enlarged schematic diagram of part A in the middle.

[0031] Figure 7 This is a schematic diagram of the connection between the jacking jack and the O-shaped jack in Embodiment 3.

[0032] Figure 8 yes Figure 7 Enlarged schematic diagram of section B.

[0033] Explanation of reference numerals in the attached figures: 1. Jacking mechanism; 10. Support frame; 11. Jacking jack; 111. Jacking piston rod; 112. End; 2. O-ring; 3. Snap ring; 30. Mounting groove; 31. Fastener; 311. Guide slope; 32. Support spring; 321. Connecting block; 33. Limiting component; 331. Limiting seat; 332. Limiting ratchet; 333. Limiting pawl; 334. Limiting drive component; 335. Supporting hydraulic cylinder; 336. Electromagnet; 4. Pressure sensor; 5. Limiting hydraulic cylinder. Detailed Implementation

[0034] The following is in conjunction with the appendix Figure 1-8 This application will be described in further detail.

[0035] This application discloses a quick locking and shrinking device for jacking pipe top iron.

[0036] Example 1 A quick-locking and retracting device for jacking pipe top iron, as described in the following description. Figure 1 and Figure 2 It includes a jacking mechanism 1 and an O-shaped jack 2. The jacking mechanism 1 includes several jacking jacks 11, which work together with the O-shaped jack 2 to jack the pipeline.

[0037] Reference Figure 1 and Figure 2 The O-shaped jack 2 is made of Q345 steel. The jacking jack 11 is supported by a support frame 10 and installed in the starting shaft at the pipe jacking construction site. The jacking jack 11 includes a jacking piston rod 111, with an end cap 112 connected to its end. The outer diameter of the end cap 112 is larger than the outer diameter of the jacking piston rod 111. A retaining ring 3 is provided at one end of the O-shaped jack 2 corresponding to several jacking jacks 11. The end of the retaining ring 3 is welded and fixed to the end face of the O-shaped jack 2. The axial direction of the retaining ring 3 is parallel to the axial direction of the O-shaped jack 2. The retaining ring 3 is used to allow the end cap 112 of the jacking piston rod 111 to extend into it. The clearance between the inner diameter of the retaining ring 3 and the end cap 112 of the jacking jack 11 is less than 2mm to facilitate the smooth insertion and removal of the end cap 112 of the jacking jack 11 from the retaining ring 3. To ensure a secure connection between the retaining ring 3 and the O-ring 2, the retaining ring 3 is fabricated on-site using Q345 steel. The retaining ring 3 is 200mm thick. A 360° circumferential weld is used during the welding process of the retaining ring 3 to ensure full-section fusion welding. The weld leg height is 10mm, and the flaw detection level is guaranteed to reach Level II after welding.

[0038] When the retaining ring 3 is fixed to the O-type top iron 2, after the O-type top iron 2 is temporarily fixed in the launching shaft, the surveyor uses the densified traverse points to measure and release the center line and elevation of the pipeline in the launching shaft. A laser theodolite is placed on the center line, and the slope of the laser theodolite is adjusted using the known elevation. The laser is used to preliminarily position the extension line of the jacking jack 11 to the O-type top iron 2 to determine the installation position of the retaining ring 3. At the same time, a laser receiving target is embedded in the end face of the O-type top iron 2 at the installation position of the retaining ring 3. The laser receiving target is a glue-type target glued to the end face of the O-type top iron 2 and linked with the laser emitter of the launching shaft. The positioning error is ≤1mm to ensure the accurate installation position of the retaining ring 3.

[0039] Reference Figure 2 and Figure 3 Each retaining ring 3 is equipped with a snap-fit ​​assembly, which includes four mounting slots 30 evenly distributed around the inner circumference of the retaining ring 3. The four mounting slots 30 are evenly distributed axially around the retaining ring 3. The mounting slots 30 are rectangular slots. A snap-fit ​​element 31 is provided in the mounting slot 30, and the end of the snap-fit ​​element 31 has a snap-fit ​​gap with the O-ring top 2. The snap-fit ​​gap is slightly larger than the thickness of the end 112.

[0040] Reference Figure 2 and Figure 3 The fastener 31 has a guide slope 311 formed on the side facing the axial direction of the retaining ring 3. The distance between the guide slope 311 and the axial direction of the retaining ring 3 gradually increases from the direction closer to the O-ring 2 to the direction further away from the O-ring 2.

[0041] Reference Figure 2 and Figure 3 An elastic element is provided within the mounting groove 30 corresponding to the snap fastener 31. This elastic element drives the snap fastener 31 to extend out of the mounting groove 30. Specifically, the elastic element includes several support springs 32 disposed within the mounting groove 30. The two ends of each support spring 32 are respectively connected to the bottom wall of the mounting groove 30 and the side of the snap fastener 31 opposite to the axial direction of the retaining ring 3. When the support springs 32 are in their initial state, the snap fastener 31 extends out of the mounting groove 30.

[0042] When the jacking jack 11 drives the jacking piston rod 111 to extend the end 112 into the inner cavity of the retaining ring 3, the end 112 contacts the guide slope 311 of the retaining member 31, and the retaining member 31 is pressed into the mounting groove 30. When the jacking jack 11 drives the jacking piston rod 111 to move the end 112 to the locking gap, the support spring 32 in the mounting groove 30 drives the retaining member 31 to reset and extend out of the mounting groove 30. Several retaining members 31 extending out of the mounting groove 30 cooperate to lock the end 112 of the jacking piston rod 111, so that the jacking jack 11 and the O-ring jack 2 are firmly connected. On the one hand, when the jacking jack 11 pushes in and retracts, it can drive the O-ring jack 2 to move together, eliminating the need for frequent hoisting of the O-ring jack 2, which is conducive to improving the overall construction efficiency. On the other hand, when the jacking jack 11 loses pressure or retracts due to malfunction, it can effectively limit the displacement and overturning of the O-ring jack 2.

[0043] Reference Figure 3 and Figure 4 The end of the fastener 31 away from the O-ring 2 is hinged to the end of the mounting groove 30 away from the O-ring 2; the hinge end of the fastener 31 is axially perpendicular to the axial direction of the retaining ring 3. The support spring 32 is located at the end of the fastener 31 near the O-ring 2, and the end of the support spring 32 near the fastener 31 is connected to the fastener 31 through the connecting block 321.

[0044] A limiting member 33 is provided in the mounting groove 30 to limit the retraction of the support spring 32. Specifically, the limiting member 33 is located at one end of the mounting groove 30 near the O-ring top iron 2, and the limiting member 33 includes a limiting seat 331, a limiting ratchet 332, a limiting pawl 333, and a limiting drive member 334.

[0045] The limiting ratchet 332 is rotatably connected to the limiting seat 331; the rotation axis of the limiting ratchet 332 is parallel to the axis of the hinge end of the buckle 31; the limiting pawl 333 is connected to the connecting block 321, and the limiting pawl 333 is engaged in the tooth gap of the limiting ratchet 332 to cooperate with the limiting ratchet 332 to limit the support spring 32, thereby restricting the compression of the support spring 32; The limit drive 334 is used to drive the limit seat 331 to move the limit ratchet 332 in a direction perpendicular to the axis of the limit ratchet 332. Specifically, the limit drive 334 can be a hydraulic cylinder or a pneumatic cylinder.

[0046] When the jacking jack 11 drives the jacking piston rod 111 to extend the end 112 into the inner cavity of the retaining ring 3, the limiting drive member 334 drives the limiting seat 331 to drive the limiting ratchet 332 away from the limiting pawl 333 on the connecting block 321, so as to release the limitation on the support spring 32, so that the buckle member 31 and the support spring 32 can be normally compressed and swing into the mounting groove 30 when the jack end 112 enters the retaining ring 3.

[0047] When the end 112 of the jack 11 moves into place, the limiting drive 334 drives the limiting seat to move the limiting ratchet 332 close to the limiting pawl 333 of the connecting block 321, so that the limiting pawl 333 engages with the tooth gap of the limiting ratchet 332. The limiting pawl 333, in conjunction with the limiting ratchet 332, restricts the support spring 32 from being compressed by external force, which would affect the stability of the fastener 31. This is beneficial for the fastener 31 to better engage and limit the support spring 32.

[0048] Reference Figure 2 and Figure 3 The O-shaped top iron 2 has several pressure feedback components corresponding to several retaining rings 3 on its end face. These pressure feedback components include a pressure sensor 4 and an alarm. Specifically, the pressure sensor 4 is a thin-film pressure sensor, and the alarm is an audible and visual alarm. In this embodiment, the thin-film pressure sensor 4 is model FBG-2000, with a micro-strain detection accuracy of ±0.5με, a distance of 5mm from the retaining ring surface, a range of -2000 to +2000με, and a sampling frequency of 100Hz. The pressure sensor 4 is installed inside the corresponding retaining ring 3; the alarm is positioned close to the retaining ring 3. The O-shaped top iron 2 has a controller corresponding to each pressure feedback component; the pressure sensor 4, the alarm, and the jacking jack 11 are all electrically connected to the controller. The pressure sensor 4 is used to acquire the jacking force of the jacking jack 11 and feed it back to the controller. In other embodiments, the controller can be installed on the support frame 10 of the jacking jack 11.

[0049] During the subsequent jacking of the pipeline by the jacking jack 11 in conjunction with the O-ring jack 2, when the pressure sensor 4 detects that the jacking force of the jacking jack 11 exceeds the preset value (±15%), it transmits a signal to the controller. The controller then triggers an alarm to issue a warning signal and controls the jacking jack 11 to adjust its jacking force. This helps reduce the risk of loosening of the connection between the O-ring jack 2 and the pipeline due to soil fluctuations at the tunnel face during subsequent jacking construction, which could lead to excessive jacking force on individual jacking jacks 11, uneven stress on the pipeline ends, or even pipeline damage. Simultaneously, the controller uses real-time linkage control of the jacking jack 11 based on its stress status, contributing to the safety and stability of the jacking construction process.

[0050] This application has been practically applied to the Yellow River pipe jacking project. Based on the monitoring of the jacking process of DN2400 reinforced concrete pipes during the Yellow River pipe jacking project, the jacking force of jack 11 under normal conditions is 20MPa. Verification and statistical analysis through continuous jacking of 100m show that the positioning and installation time of this device is reduced by 60% compared to traditional methods (from 30 minutes / time to 12 minutes / time); the pipe breakage rate during jacking is reduced from 15% to below 2%; the FBG sensor monitoring jacking force deviation is ≤3%, and the measured alarm response time is 200ms (±20ms). This effectively ensures balanced jacking force during the jacking process of each jack 11.

[0051] The implementation principle of Example 1: During jacking construction, the O-shaped jack 2 is hoisted to the front end of several jacking jacks 11 and temporarily fixed. The jacking jacks 11 drive the corresponding end 112 to extend into the corresponding retaining ring 3 of the O-shaped jack 2. After the end 112 of the O-shaped jack 2 moves into place, several fasteners 31 in the retaining ring 3 cooperate to lock and limit the end 112 of the jacking jack 11. The limiting component 33 limits the support spring 32 to support and limit the fasteners 31, thus achieving a stable connection between the O-shaped jack 2 and the jacking jacks 11. When the jacking jacks 11 perform jacking or retraction construction, they can drive the O-shaped jack 2 to move synchronously.

[0052] Example 2 The difference between Example 2 and Example 1 is that Example 2 improves the impact load resistance of the buckling component by 40% by using the auxiliary component of the supporting hydraulic cylinder 335.

[0053] Reference Figure 5 and Figure 6 The snap fastener 31 is slidably inserted into the mounting groove 30. Several supporting hydraulic cylinders 335 are provided on the outer side of the snap ring 3 corresponding to several mounting grooves 30. Each supporting hydraulic cylinder 335 is fixed to the outer periphery of the snap ring 3 and is positioned opposite to its corresponding mounting groove 30. The piston rods of the supporting hydraulic cylinders 335 pass through the snap ring 3 and extend into the corresponding mounting groove 30 on the inner periphery of the snap ring 3, with the end of the piston rod of the supporting hydraulic cylinder 335 positioned opposite to the snap fastener 31. An electromagnet 336 is provided at the end of the piston rod of the supporting hydraulic cylinder 335. When the electromagnet 336 is energized, it magnetically engages with the snap fastener 31 in the mounting groove 30.

[0054] By supporting the hydraulic cylinder 335 and the electromagnet 336, when the jacking jack 11 drives the end 112 into the retaining ring 3, the hydraulic cylinder 335 drives its piston rod to retract the electromagnet 336, so that the retaining member 31 can be retracted into the corresponding mounting groove 30 when under pressure. After the end 112 is moved into place and locked by several retaining members 31 inside the retaining ring 3, the hydraulic cylinder 335 drives its piston rod to drive the electromagnet 336 to abut against the corresponding retaining member 31 in the mounting groove 30, thereby supporting and limiting the retaining member 31. This prevents the retaining member 31 from retracting due to severe external vibration or impact load during subsequent jacking operations, which would affect the locking effect on the end 112. When the subsequent construction is completed and it is necessary to separate the jacking jack 11 and the O-ring jack 2, the electromagnet 336 can be energized and the supporting hydraulic cylinder 335 can drive the electromagnet 336 to retract, so as to drive the buckle 31 to be stored in the corresponding mounting groove 30, thereby making it easier for the jacking jack 11 to drive the end head 112 to disengage from the retaining ring 3 of the O-ring jack 2, thus realizing the separation of the two.

[0055] The implementation principle of Example 2 is as follows: During jacking construction, the O-shaped jack 2 is hoisted to the front end of several jacking jacks 11 and temporarily fixed. The jacking jacks 11 drive the corresponding ends 112 to extend into the corresponding retaining rings 3 of the O-shaped jack 2. After the ends 112 of the O-shaped jack 2 are in place, several retaining pieces 31 in the retaining rings 3 engage and limit the ends 112 of the jacking jacks 11. The supporting hydraulic cylinder 335 drives the electromagnet 336 to abut against the corresponding retaining piece 31 to support and limit the retaining piece 31, thus achieving a stable connection between the O-shaped jack 2 and the jacking jacks 11. When the jacking jacks 11 perform jacking or retraction operations, they can drive the O-shaped jack 2 to move synchronously. This effectively avoids the need for frequent secondary hoisting of the O-shaped jack 2 during pipe jacking construction, improving the construction efficiency of pipe jacking.

[0056] Example 3 Reference Figure 7 and Figure 8 The difference between Embodiment 3 and Embodiment 2 is that: four limiting hydraulic cylinders 5 are arranged around the outer side of the retaining ring 3. The four limiting hydraulic cylinders 5 are evenly distributed axially around the retaining ring 3, and all four limiting hydraulic cylinders 5 are fixed to the outer periphery of the retaining ring 3. The piston rods of the limiting hydraulic cylinders 5 all pass through the retaining ring 3, and the piston rods of the limiting hydraulic cylinders 5 are all oriented towards the snap-fit ​​gap inside the retaining ring 3. When the jacking jack 11 drives the O-ring jack 2 to retract, the limiting hydraulic cylinders 5 drive the end 112 of the jacking jack 11 to clamp and limit it, reducing the possibility of deformation and damage to the snap-fit ​​component 31 due to the concentrated external load acting on it.

[0057] The implementation principle of Example 3 is similar to that of Example 2, so it will not be described again.

[0058] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A quick-locking and retracting device for jacking pipe top iron, comprising a jacking mechanism (1) and an O-shaped top iron (2); characterized in that: The jacking mechanism (1) includes a plurality of jacking jacks (11), each jacking jack (11) including a jacking piston rod (111), the end of the jacking piston rod (111) being connected to an end head (112), the outer diameter of the end head (112) being larger than the outer diameter of the jacking piston rod (111); One end of the O-shaped top iron (2) is provided with a retaining ring (3) corresponding to several of the jacking jacks (11). The retaining ring (3) is used for the end (112) of the jacking piston rod (111) to extend into. Each retaining ring (3) is provided with a snap-fit ​​assembly, which includes several mounting grooves (30) evenly opened on the inner circumference of the retaining ring (3). Each mounting groove (30) is provided with a fastener (31), and the fastener (31) and the O-shaped top iron (2) have a snap-fit ​​gap. The width of the snap-fit ​​gap is greater than that of the end (112). The thickness of 12) and the end of the buckle (31) facing the O-ring (2) is used for the end (112) to abut; the buckle (31) is formed with a guide slope (311) on the axial side facing the retaining ring (3), and the distance between the guide slope (311) and the retaining ring (3) gradually increases from the direction close to the O-ring (2) to the direction away from the O-ring (2); an elastic element is provided in the mounting groove (30), and the elastic element is used to drive the buckle (31) to extend out of the mounting groove (30); When the jacking jack (11) drives the jacking piston rod (111) to move the end (112) into the inner cavity of the retaining ring (3), the retaining member (31) is pressed into the mounting groove (30); when the jacking jack (11) drives the jacking piston rod (111) to move the end (112) to the locking gap, the elastic member drives the retaining member (31) to reset so as to lock the end (112) of the jacking piston rod (111).

2. The quick-locking and retracting device for jacking pipe and top iron as described in claim 1, characterized in that: The elastic element includes a plurality of support springs (32) disposed in the mounting groove (30), and the two ends of the support springs (32) are respectively connected to the bottom wall of the mounting groove (30) and the side of the buckle (31) away from the axial direction of the buckle (3).

3. The quick locking and retraction device for jacking pipe and top iron as described in claim 2, characterized in that: The end of the buckle (31) away from the O-shaped top iron (2) is hinged to the end of the mounting groove (30) away from the O-shaped top iron (2); the support spring (32) is connected to the buckle (31) through the connecting block (321); The retaining ring (3) is provided with a limiting member (33), which is used to limit the retraction of the support spring (32); The limiting member (33) is located in the mounting groove (30) and is set close to the O-shaped top iron (2). The limiting member (33) includes a limiting seat (331), a limiting ratchet (332), a limiting pawl (333), and a limiting drive member (334). The limiting ratchet (332) is rotatably connected to the limiting seat (331). The limiting pawl (333) is connected to the connecting block (321), and the limiting pawl (333) is engaged in the tooth gap of the limiting ratchet (332) to cooperate with the limiting ratchet (332) to limit the support spring (32) and restrict the compression of the support spring (32). The limiting drive member (334) is used to drive the limiting seat (331) to move in a direction perpendicular to the axial direction of the limiting ratchet (332).

4. The quick locking and retraction device for jacking pipe and top iron as described in claim 2, characterized in that: The O-shaped jack (2) is provided with a pressure feedback component corresponding to the retaining ring (3). The pressure feedback component includes a pressure sensor (4) and an alarm. The pressure sensor (4) is located in the inner cavity of the retaining ring (3). The O-shaped jack (2) is provided with a controller. The pressure sensor (4) and the alarm are both electrically connected to the controller. The pressure sensor (4) is used to obtain the jacking force of the jacking jack (11) and feed it back to the controller.

5. The quick locking and retraction device for jacking pipe and top iron as described in claim 4, characterized in that: The jacks (11) are all electrically connected to the controller; When the controller detects that the jacking force of the jacking jack (11) exceeds the limit through the pressure sensor (4), the controller controls the jacking jack (11) to adjust the jacking force.

6. The quick locking and retraction device for jacking pipe and top iron as described in claim 2, characterized in that: The retaining ring (3) is provided with a limiting member (33), which is used to limit the retraction of the support spring (32); The limiting member (33) includes a supporting hydraulic cylinder (335) disposed outside the retaining ring (3). The piston rod of the supporting hydraulic cylinder (335) passes through the retaining ring (3) and extends into the mounting groove (30). The end of the piston rod of the supporting hydraulic cylinder (335) is disposed opposite to the buckling member (31) located in the mounting groove (30).

7. The quick-locking and retracting device for jacking pipe and top iron as described in claim 6, characterized in that: The piston rod end of the supporting hydraulic cylinder (335) is connected to an electromagnet (336). When the electromagnet (336) is energized and the electromagnet (336) abuts against the buckle (31), the electromagnet (336) and the buckle (31) are magnetically connected.

8. The quick locking and retraction device for jacking pipe and top iron as described in claim 6, characterized in that: A plurality of limiting hydraulic cylinders (5) are arranged around the outer side of the retaining ring (3). The piston rods of the limiting hydraulic cylinders (5) are all inserted through the retaining ring (3), and the piston rods of the limiting hydraulic cylinders (5) are all arranged towards the retaining gap.

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