Ultra-large-section quasi-rectangular jacking pipe steel-concrete structure launching platform and using method thereof

Abstract

The invention discloses an ultra-large-section quasi-rectangular pipe jacking steel-concrete structure starting platform and a using method thereof, relates to the technical field of pipe jacking machine starting stations, and solves the technical problems that the safety and the effect are poor, secondary auxiliary correction is difficult to carry out and construction is influenced. The ultra-large-section quasi-rectangular pipe jacking steel-concrete structure starting platform comprises a back plate and a bottom plate, a steel structure is arranged on the bottom plate, and a guide rail is arranged on the steel structure; a first correcting fixing shaft is arranged in the correcting main frame; a correcting arm is arranged on the surface of the first correcting fixing shaft; correcting wheels are arranged on the two sides of the correcting arm; a first correcting connecting shaft is arranged at the upper end of the first correcting fixing shaft; by means of a linkage correction structure of the upper pushed frame, the lower pushed frame and the correction wheels, automatic correction is achieved, the pipeline lowering and positioning accuracy is improved, manual operation steps are reduced, and safety is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipe jacking machine launching station, in particular to an ultra-large section rectangular pipe jacking steel-concrete structure launching platform and a use method thereof. BACKGROUND

[0002] The rectangular pipe jacking machine launching station is a special construction facility for providing an initial operation environment and support for the rectangular pipe jacking machine in urban underground engineering. The core includes a launching platform, a back force receiving structure, a jacking driving system, a pipe jacking machine body fixing device, a jacking reaction force transmission device, a pipe precise splicing guide device, and a pipe deviation correction device. The rectangular pipe jacking machine launching station has a high space utilization rate and is mainly used in underground pipe galleries and comprehensive pipeline engineering.

[0003] Currently, when checking the state of each component (the launching platform, the back force receiving structure, the jacking system, etc.) of the launching station, the rectangular pipe jacking machine body needs to be fixed on the launching platform guide rail to ensure that the machine body axis is consistent with the designed jacking direction. The back force receiving structure is adjusted to stably connect with the launching platform. The jacking driving system is pre-pressed and tested to confirm that the reaction force transmission path is unobstructed, and to avoid structural displacement during construction. When the pipes are connected, the pipes are placed in the track arranged in advance by the external travelling crane. However, during the lowering process, the travelling crane only has rough positioning effect, and manual pushing is still needed to position and correct the lowering steps. This requires a large amount of manpower, and the correction in the relatively closed environment of the launching station and the large pipe itself greatly affects safety.

[0004] After the pipe is lowered to the placement position and connected, the workers need to fix and connect the pipes by welding. However, if the pipe still has position deviation when it is lowered into the track, it is difficult to correct the pipe again during the connection process due to the large weight of the pipe and the increased friction force caused by the contact with the track below, which affects the subsequent welding and pipe jacking construction efficiency.

[0005] During the pipe jacking process, hard ground may be encountered. The existing equipment usually has two solutions for this situation: one is to continue feeding, and the other is to directly stop the equipment by detecting the pressure. However, if the hard geological environment only has a small depth, stopping for inspection (especially when the workers are inspecting) will greatly reduce the actual construction efficiency. The present application mainly compensates and improves the second situation.

[0006] On this basis, the present application provides an ultra-large section rectangular pipe jacking steel-concrete structure launching platform and a use method thereof to solve this problem. SUMMARY

[0007] In view of the above, in order to overcome the defects of the prior art, the present application provides a kind of super section rectangular top pipe steel concrete structure originating station and its using method, the present application structure is ingenious, the key is practical, effectively solve the auxiliary position correction safety and effect is poor, difficult to secondary auxiliary correction in pipe docking process and influence construction efficiency technical problem.

[0008] To achieve the above object, the present application adopts the following technical solutions:

[0009] A kind of super section rectangular top pipe steel concrete structure originating station, including back plate, fixedly installed in the bottom plate of back plate bottom plate, fixedly installed with steel structure on bottom plate, fixedly installed with guide rail on steel structure, ring-shaped push rack is placed in the top of guide rail, U-shaped push rack and multiple spliced pipes sliding in ring-shaped push rack, the surface of back plate is fixedly installed with multiple symmetrical main hydraulic cylinders, U-shaped push rack is arranged at one end position of multiple main hydraulic cylinders, the top of bottom plate is fixedly installed with two symmetrical correction main frames, two the first correction fixed shafts are fixedly installed in correction main frame, the surface of each first correction fixed shaft is slidably connected with correction arm through correction sliding groove, two correction wheels are rotatably connected with each correction arm near lower end head, first correction connecting shaft is fixedly installed in the position near upper end head of each correction arm, same connecting arm is rotatably connected with first correction connecting shaft at both ends, lower pushed frame is fixedly connected with one end of each connecting arm, second correction connecting shaft is fixedly installed in the inner side of each connecting arm, pushing arm is slidably connected with the surface of each second correction connecting shaft through lower limit hole, fixed frame is fixedly installed on one side of each correction main frame, second correction fixed shaft is fixedly installed in the inner side of fixed frame, each pushing arm is slidably connected on the surface of second correction fixed shaft through upper limit hole opened on the surface, reset connecting shaft is fixedly installed in the position near upper end head of each pushing arm, same upper pushing rod slidably connected in correction main frame is rotatably connected with reset connecting shaft at both ends, upper pushed frame is fixedly installed on one end of each upper pushing rod.

[0010] Preferably, two symmetrical limiting sliding grooves are opened in each correction main frame, limiting sliding block fixedly installed on the surface of lower pushed frame is slidably connected in each limiting sliding groove.

[0011] Preferably, two symmetrical guide plates are fixedly installed on one side of the position near upper end head of each limiting sliding groove.

[0012] Preferably, four symmetrical fixed rails are fixedly installed on both sides of ring-shaped push rack, same sliding frame is slidably connected on the surface of every two adjacent fixed rails, limiting frame capable of clamping and limiting spliced pipe is fixedly installed on one side of each sliding frame, two symmetrical pushing plates capable of contacting with sliding frame are fixedly installed on one side of U-shaped push rack.

[0013] Preferably, one end of each of the main hydraulic cylinders is fixedly installed with a first push frame, and a part of each of the main hydraulic cylinders is fixedly installed with a compensation push rod outside the main hydraulic cylinder, and the output end of each of the compensation push rods is fixedly installed with a push block, and two second push arms are rotatably arranged on the two sides of each of the push blocks, and a first push arm is rotatably arranged on the inner side of each of the second push arms and hinged to one side of the first push frame, and a third push arm is rotatably connected to one side of each of the second push frames and hinged to one side of the second push frame, and a support rod is fixedly installed on one side of each of the second push frames and fixedly installed on one side of the U-shaped push frame.

[0014] Preferably, two limiting rods are symmetrically arranged in each of the first push frames and fixedly installed on one side of the second push frame.

[0015] Preferably, an inner cavity is formed in the U-shaped push frame, a support frame is slidably connected in the inner cavity, a plurality of guide cylinders are rotatably connected in the support frame, a plurality of guide rails are fixedly installed on the inner side of the annular push frame, the number of the guide cylinders is the same as that of the guide rails, the plurality of guide cylinders are slidably connected to the surfaces of different guide rails, two extension plates are symmetrically arranged on one side of the support frame and fixedly installed on one end of the two extension plates, and a cleaning plate capable of contacting the guide rails is fixedly installed on one end of each of the two extension plates.

[0016] Preferably, two symmetrically distributed support sliding grooves are formed in the U-shaped push frame and communicate with the inner cavity, and a support sliding block is slidably connected in each of the support sliding grooves and fixedly installed on the surface of the support frame.

[0017] A use method of an ultra-large cross-section rectangular top pipe steel-concrete structure launching platform, comprising the following steps:

[0018] S1, first position the external travelling crane at a suitable position above the launching station, and then confirm that the foundation structure of the launching platform is installed stably, and then clamp the prepared prestressed reinforced concrete spliced pipeline above the launching station by the concave-shaped clamping jaw of the travelling crane, and complete the preliminary positioning of the pipeline after clamping the pipeline;

[0019] S2, then the travelling crane drives the clamping jaw and the spliced pipeline to descend, the lower surface of the spliced pipeline first contacts the upper pushed frame in the correction main frame, pushes the two upper pushed frames to move outward, and then drives the upper push rod and the upper end of the push arm to move outward synchronously, under the limiting action of the second correction fixed shaft and the upper limiting hole, the lower end of the push arm moves inward, drives the upper end of the connecting arm and the correction arm to move inward, cooperates with the correction sliding groove and the first correction fixed shaft to limit, and makes the correction wheel at the lower end of the correction arm move outward and away from the middle of the bottom plate, so as to provide enough space for the spliced pipeline to descend.

[0020] S3, the spliced pipeline continues to descend, the lower surface contacts the lower pushing frame and is separated from the upper pushing frame, the pipeline pushes the lower pushing frame, the first correction connecting shaft and the upper end of the correction arm to move outward, drives the correction wheel to move inward, and when the pipeline continues to descend, the correction wheel on the inner side assists the pipeline in positioning;

[0021] S4, after the spliced pipeline is roughly positioned and placed on the guide rail, the trolley drives the clamping jaw to separate from the spliced pipeline and ascend, the clamping jaw contacts the upper pushing frame from below and pushes it inward during the ascending process, drives the correction wheel to move away from the spliced pipeline, and avoids affecting the subsequent jacking;

[0022] S5, the main hydraulic cylinder on the back plate is started, the main hydraulic cylinder pushes the U-shaped pushing frame to move forward, the pushing plate on one side of the U-shaped pushing frame pushes the sliding frame and the limiting frame to move forward until the U-shaped pushing frame is attached to the annular pushing frame, at this time, the limiting frame is completely pushed out, and the U-shaped pushing frame and the annular pushing frame contact the spliced pipeline at the same time, the spliced pipeline is corrected for the second time through the inclined surface of the limiting frame and the inner horizontal surface, and the pipeline is ensured to be stably pushed along the guide rail.

[0023] Preferably, the following steps are further included:

[0024] S6, if the shield cutter head contacts a hard ground, the compensation push rod is controlled to pull back the first pushing frame, the first pushing arm, the second pushing arm, the third pushing arm and the second pushing frame at a uniform speed;

[0025] S7, after each pipe jacking operation is completed, the waste is first injected into the waste trolley, the waste trolley is moved out of the starting station by the trolley, and after the cleaning is completed, the trolley is reset to the spliced pipeline, then the U-shaped pushing frame is pulled back by the main hydraulic cylinder, the U-shaped pushing frame and the annular pushing frame are staggered during the pulling back process, the support frame and the guide cylinder in the inner cavity of the U-shaped pushing frame are pulled to move outward, the curved structure of the guide rail makes the support frame move downward, the cleaning plate at one end of the extension plate is attached to the guide rail, and when the U-shaped pushing frame continues to pull back, the cleaning plate moves with it to clean the surface debris of the guide rail, and at the same time, the annular pushing frame is reset with the U-shaped pushing frame, so that the pipeline is ready for the next time.

[0026] The present application has the following technical effects.

[0027] 1. By means of the linkage correction structure of the upper pushing frame, the lower pushing frame and the correction wheel, the correction wheel can be automatically driven to move outward to leave space first and then move inward to assist positioning during the descending process of the pipeline, and if the pipeline deviates, the lower pushing frame can also automatically correct the deviation through the inclined surface, without the need for manual intervention and adjustment, which not only improves the accuracy of pipeline positioning, but also reduces the manual operation steps, improves safety, and improves positioning efficiency, laying a good foundation for subsequent jacking operations;

[0028] 2. The application pushes the sliding frame and the limiting frame along the inclined fixed rail automatically by the push plate, and the limiting frame can correct the spliced pipeline again through its own structure when the U-shaped push frame and the ring-shaped push frame are attached, which makes the pushing and correcting actions synchronous, avoids the construction deviation caused by deviation during pipeline pushing, ensures that the pipeline always advances stably along the guide rail, effectively improves the straightness and engineering quality of pipe jacking construction, saves the time of separately setting the correction process, and improves the overall construction efficiency;

[0029] 3. The application realizes real-time monitoring and accurate regulation through the pressure sensor and the laser level detector, when encountering hard ground, the compensation push rod can slowly pull back the related push frame and push arm, ensuring the pipeline to advance slowly to cooperate with the cutter head operation, and when the pressure is too high, it can also trigger an emergency stop to avoid equipment overload damage, when the hydraulic cylinder explodes or the pipeline tilts, the laser level detector can quickly control the equipment to stop urgently to prevent accidents from expanding, this multi-level abnormal response mechanism greatly improves the safety and stability of construction, reduces the delay of construction period and equipment maintenance cost caused by abnormal conditions, and reduces the construction risk. DETAILED DESCRIPTION

[0030] The accompanying drawings are included to provide a further understanding of the application and constitute a part of the specification, together with the embodiments of the application, to explain the application, and do not constitute a limitation on the application. In the drawings:

[0031] Figure 1 It is a schematic diagram of the three-dimensional structure of the application.

[0032] Figure 2 It is a schematic diagram of the assembly structure of the steel structure, bottom plate and spliced pipeline in the application.

[0033] Figure 3 It is a schematic diagram of the assembly structure of the correction arm, upper push rod and push arm in the application.

[0034] Figure 4 It is a schematic diagram of the assembly structure of the back plate, main hydraulic cylinder and guide rail in the application.

[0035] Figure 5 It is a schematic diagram of the assembly structure of the back plate, main hydraulic cylinder and guide rail in the application. Figure 4

[0036] Figure 6 It is a schematic diagram of the assembly structure of the back plate, main hydraulic cylinder and guide rail in the application.

[0037] Figure 7 It is a schematic diagram of the assembly structure of the back plate, main hydraulic cylinder and guide rail in the application.

[0038] Figure 8 It is a schematic diagram of the assembly structure of the back plate, main hydraulic cylinder and guide rail in the application.​Figure 7 Enlarged structural schematic view at B.

[0039] Reference signs:

[0040] 1, back plate; 2, steel structure; 3, bottom plate; 4, main hydraulic cylinder; 5, U-shaped pushing frame; 6, ring-shaped pushing frame; 7, spliced pipeline; 8, correction main frame; 9, guide plate; 10, guide rail; 11, correction wheel; 12, correction arm; 13, first correction fixed shaft; 14, correction sliding groove; 15, first correction connecting shaft; 16, connecting arm; 17, lower pushed frame; 18, limiting sliding groove; 19, limiting sliding block; 20, upper pushed frame; 21, upper pushing rod; 22, pushing arm; 23, reset connecting shaft; 24, fixed frame; 25, upper limiting hole; 26, lower limiting hole; 27, second correction connecting shaft; 28, pushing plate; 29, fixed rail; 30, sliding frame; 31, limiting frame; 32, compensation pushing rod; 33, first-stage pushing frame; 34, limiting rod; 35, pushing block; 36, second-stage pushing frame; 37, supporting rod; 38, first-stage pushing arm; 39, second-stage pushing arm; 40, third-stage pushing arm; 41, cleaning plate; 42, inner cavity; 43, supporting frame; 44, supporting sliding groove; 45, supporting sliding block; 46, guide rail; 47, guide cylinder; 48, extension plate; 49, second correction fixed shaft. DETAILED DESCRIPTION

[0041] The foregoing and other technical contents, features and effects of the present application will be described in detail below with reference to the accompanying drawings. Figures 1 to 8 The detailed description of the embodiments will be clearly presented. The contents mentioned in the following embodiments are all with reference to the drawings.

[0042] The exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0043] The application discloses a large-section rectangular top pipe steel-concrete structure starting station, which comprises a back plate 1, a bottom plate 3 fixedly installed at the bottom of the back plate 1, and is formed at a right angle between the back plate 1 and the bottom plate 3, wherein the back plate 1 and the bottom plate 3 are both structures combined by steel plates and concrete, a steel structure 2 is fixedly installed on the bottom plate 3 and used for prefabricated installation of guide rails 10, the steel structure 2 is fixedly installed with the guide rails 10, the guide rails 10 are composed of a plurality of long strip-shaped steel material metal frames which are attached to the bottom surface of a spliced pipe 7, an annular pushing frame 6 and a plurality of spliced pipes 7 are placed on the top of the guide rails 10 and the U-shaped pushing frame 5 slides in the annular pushing frame 6, the U-shaped pushing frame 5 and the annular pushing frame 6 are used in cooperation, the overall supporting effect on the pipe can be enhanced, the construction safety and stability are improved, the starting station construction can be smoothly carried out under different geological conditions, pipe specifications and construction processes, the engineering quality is ensured, the spliced pipe 7 is a prestressed reinforced concrete pipe, a plurality of main hydraulic cylinders 4 are fixedly installed on the surface of the back plate 1 and are symmetrically distributed, the U-shaped pushing frame 5 is arranged at one end of the plurality of main hydraulic cylinders 4, the main hydraulic cylinders 4 are used for pushing control of the U-shaped pushing frame 5, the annular pushing frame 6 and the spliced pipe 7, the main hydraulic cylinders 4 are connected with a power supply and a controller, two symmetrically distributed correction main frames 8 are fixedly installed on the top of the bottom plate 3, an inclined chute which is inclined to the middle position of the bottom plate 3 is formed on the correction main frame 8 close to the upper end position, a first correction fixed shaft 13 is fixedly installed in each correction main frame 8, a through hole is formed in the middle position of the correction main frame 8, the first correction fixed shaft 13 is fixedly installed in the through hole, a correction arm 12 is slidably connected to the surface of each first correction fixed shaft 13 through a correction sliding groove 14, the correction sliding groove 14 is an oval sliding groove, two correction wheels 11 are rotatably connected to the two sides of the lower end of each correction arm 12, a plurality of anti-skid grooves are formed in the surface of the correction wheel 11, the correction wheel 11 can coarsely correct and limit the spliced pipe 7, a first correction connecting shaft 15 is fixedly installed in the position close to the upper end of each correction arm 12, the same connecting arm 16 is rotatably connected to the two ends of the first correction connecting shaft 15, a lower pushed frame 17 is fixedly connected to one end of each connecting arm 16, the lower pushed frame 17 is a trapezoidal metal frame with an inclined surface upward, when the spliced pipe 7 is lowered through a travelling crane, the trapezoidal inclined surface of the lower pushed frame 17 can stably push the lower pushed frame 17 to two sides by pressing the trapezoidal inclined surface, a second correction connecting shaft 27 is fixedly installed in each connecting arm 16, a pushing arm 22 is slidably connected to the surface of each second correction connecting shaft 27 through a lower limiting hole 26, a fixed frame 24 is fixedly installed on one side of each correction main frame 8, a second correction fixed shaft 49 is fixedly installed in the inner side of the fixed frame 24, each pushing arm 22 is slidably connected to the surface of the second correction fixed shaft 49 through an upper limiting hole 25 formed in the surface of the pushing arm 22, the lower limiting hole 26 and the upper limiting hole 25 are both oval through holes, a reset connecting shaft 23 is fixedly installed in the position close to the upper end of each pushing arm 22, the same upper pushing rod 21 slidably connected in the correction main frame 8 is rotatably connected to the two ends of the reset connecting shaft 23, the upper pushing rod 21 is a cylindrical metal frame,Each upper push rod 21 has an upper push frame 20 fixedly installed at one end. The upper push frame 20 is a conical metal block. When it is subjected to an external force from above or below, it can push the upper push rod 21 to move to both sides. Each main straightening frame 8 has two symmetrically distributed limiting grooves 18. Each limiting groove 18 has a limiting slider 19 slidably connected to it and fixedly installed on the surface of the lower push frame 17. The limiting grooves 18 and the limiting sliders 19 can limit the lower push frame 17 in the vertical direction, ensuring that the lower push frame 17 can only move in the left and right direction. Each limiting groove 18 has two symmetrically distributed guide plates 9 fixedly installed on the side near the upper end. The swing angle of the straightening arm 12 and the moving distance of the upper push frame 20 and the lower push frame 17 are all limited.

[0044] In this embodiment, when the pipe jacking operation is being carried out, the external trolley can be placed at a suitable position above the starting station. Then, the trolley's grippers, which are U-shaped grippers, can fit and match the shape of the upper surface of the splicing pipe 7 to clamp the splicing pipe 7 prepared above the starting station. After clamping, the splicing pipe 7 is roughly positioned at a suitable position on the guide rail 10 inside the starting station.

[0045] When the crane drives the gripper and splicing pipe 7 to descend, the lower surface of the splicing pipe 7 will first contact the upper push frame 20, pushing the two upper push frames 20 gradually outward. The upper push frame 20 drives the upper push rod 21 and the upper end of the push arm 22 to move outward. With the limit of the second straightening fixing shaft 49 and the upper limit hole 25, the lower end of the push arm 22 moves inward, thereby driving the upper end of the connecting arm 16 and the straightening arm 12 to move inward synchronously. With the limit of the straightening slide 14 and the first straightening fixing shaft 13, the lower end of the straightening arm 12 and the straightening wheel 11 move outward, so that the straightening wheel 11 is away from the middle position of the base plate 3.

[0046] When the lower surface of the splicing pipe 7 contacts the lower push frame 17, the splicing pipe 7 disengages from the upper push frame 20 due to its descent. The splicing pipe 7 pushes the upper surfaces of the lower push frame 17, the first straightening connecting shaft 15, and the straightening arm 12 outward, thereby driving the straightening arm 12 and the straightening wheel 11 to push inward. As the splicing pipe 7 continues to descend, the straightening wheel 11 placed on the inner side pushes it to assist in positioning. If the splicing pipe 7 is significantly biased to one side, when the splicing pipe 7 pushes the lower push frame 17 in this direction inward to the limit position, the splicing pipe 7 will slide towards the center through the upper inclined surface of the lower push frame 17 to assist in positioning.

[0047] After the splicing pipe 7 is positioned, the crane will drive the gripper to detach from the splicing pipe 7 and rise. During the rising process, the gripper will first contact the upper push frame 20 from below and push the upper push frame 20 outward, thereby driving the straightening wheel 11 away from the middle position of the base plate 3. At this time, it is away from the splicing pipe 7 so as not to affect the subsequent pipe jacking work.

[0048] Finally, the main hydraulic cylinder 4 can be controlled by the controller to perform pipe jacking on the spliced ​​pipe 7.

[0049] As an example, four symmetrically distributed fixed rails 29 are fixedly installed on both sides of the annular pusher 6. The fixed rails 29 are inclined metal blocks. The same sliding frame 30 is slidably connected to the surface of every two adjacent fixed rails 29. Multiple reset springs are fixedly installed between the sliding frame 30 and the U-shaped pusher 5. A limiting frame 31 that can clamp and limit the splicing pipe 7 is fixedly installed on one side of each sliding frame 30. The limiting frame 31 is a trapezoidal metal frame. Two symmetrically distributed push plates 28 that can contact the sliding frame 30 are fixedly installed on one side of the U-shaped pusher 5. The push plates 28 are rectangular metal blocks.

[0050] In this embodiment, when the jacking operation is performed on the placed spliced ​​pipe 7, the U-shaped pusher 5 will slide forward in the annular pusher 6, and drive the push plate 28 on one side of the U-shaped pusher 5 to move. The push plate 28 pushes the sliding frame 30 and the limiting frame 31 forward. The sliding frame 30 and the limiting frame 31 are pushed out in conjunction with the inclined fixed rail 29 until the U-shaped pusher 5 is attached to one side of the annular pusher 6. The limiting frame 31 is then completely pushed out. When the U-shaped pusher 5 and the annular pusher 6 continue to be pushed forward and gradually contact the spliced ​​pipe 7, the limiting frame 31 can perform further correction processing on the spliced ​​pipe 7 through its own inclined surface and the horizontal surface on its inner side.

[0051] As an example, each main hydraulic cylinder 4 has a primary pusher 33 fixedly mounted at one end. Each main hydraulic cylinder 4 also has a partially externally positioned compensating pusher 32 fixedly mounted inside. The compensating pusher 32 is connected to an external power supply and controller. A pressure sensor (not shown in the diagram) is located at the end of the main hydraulic cylinder 4. The pressure sensor is connected to an external power supply and controller and is used to drive and control the compensating pusher 32. Each compensating pusher 32 has a fixedly mounted push block 35 at its output end. Each push block 35 has two rotatable secondary push arms 39 on both sides. Each secondary push arm 39 has a primary push arm 38 hinged to one side of the primary pusher 33 on its inner side. Each secondary push arm 39 has a rotatable tertiary push arm 40 hinged to one side of the secondary pusher 36 on its surface. Each of the first-stage pushers 36 has a support rod 37 fixedly installed on one side. The support rod 37 is fixedly installed on one side of the U-shaped pusher 5. The pusher block 35, the first-stage pusher arm 38, the second-stage pusher arm 39, and the third-stage pusher arm 40 can form a multiplication structure. Their combined use can reduce the driving force. The structure is equipped with a laser level detector to detect the position and angle of the shield cutter head. The laser level detector can control the emergency stop of the main hydraulic cylinder 4 and the compensation pusher 32. Both the main hydraulic cylinder 4 and the compensation pusher 32 are equipped with stroke sensors. Each first-stage pusher 33 has two symmetrically distributed and fixedly installed limit rods 34 on one side of the second-stage pusher 36. The limit rods 34 can limit and support the pushed second-stage pusher 36 to ensure the stability of the second-stage pusher 36 during movement and adjustment.

[0052] In this embodiment, during the pipe jacking operation, if the tunnel boring machine cutter head comes into contact with hard ground during the drilling process, the pressure on the main hydraulic cylinder 4 will suddenly increase. The pressure sensor receives the signal and sends it to the controller to control the compensation push rod 32 to work. The compensation push rod 32 pulls back the first-stage push frame 33, the first-stage push arm 38, the second-stage push arm 39, the third-stage push arm 40, the second-stage push frame 36, the support rod 37, and the U-shaped push frame 5 at a uniform speed. This speed is less than the feed speed of the main hydraulic cylinder 4. Thus, the spliced ​​pipe 7 will still be pushed forward, but the pushing speed will decrease, and the cutter head will continue to move forward. If the pressure is still too high when the compensation push rod 32 is pulled back to the set distance, the stroke sensor can be used to stop the compensation push rod 32 and the main hydraulic cylinder 4 in an emergency, reminding the staff to replace the cutter head or to conduct geological inspection and exploration.

[0053] If, during the pushing process, some of the main hydraulic cylinders 4 burst or the splicing pipe 7 tilts due to soft soil during excavation, the laser level detector will detect and simultaneously control the main hydraulic cylinders 4 and the compensation push rod 32 to stop urgently. Then, the staff can inspect and repair the main hydraulic cylinders 4 or the internal environment of the splicing pipe 7.

[0054] It is worth mentioning that the dual push rods of the main hydraulic cylinder 4 and the compensation push rod 32” work together to overcome the limitations of a single push rod with a compensation mechanism, which is "mutually exclusive in terms of thrust and compensation performance and prone to imbalance in case of failure" through "decoupling and independent control of thrust output and compensation adjustment". It can more reliably adapt to scenarios such as hard geological impact and cylinder explosion / pipeline tilting, while taking into account the high thrust requirements of pipe jacking, buffer protection effect and construction safety.

[0055] As one embodiment, the U-shaped pusher 5 has an inner cavity 42, within which a support frame 43 is slidably connected. Multiple guide cylinders 47 are rotatably connected within the support frame 43. Multiple guide rails 46 are fixedly installed on the inner side of the annular pusher 6. Each guide rail 46 is a downwardly curved metal rod. The number of guide cylinders 47 and guide rails 46 is the same, and the multiple guide cylinders 47 are slidably connected to different surfaces of the guide rails 46. Two symmetrically distributed extension plates 48 are fixedly installed on one side of the support frame 43. Each of the two extension plates 48 has a fixed end that can connect with… The cleaning plate 41 that contacts the guide rail 10 is shaped to match the guide rail 10. The bottom of the cleaning plate 41 is made of soft material, which can clean the debris on the surface of the guide rail 10 and reduce the problem of the splicing pipe 7 being affected by the debris remaining on the guide rail 10. The U-shaped pusher 5 has two symmetrically distributed support grooves 44 that communicate with the inner cavity 42. Each support groove 44 is slidably connected to a support slider 45 that is fixedly installed on the surface of the support frame 43.

[0056] In this embodiment, after each pipe jacking is completed, waste material needs to be injected into the waste trolley. Then, the waste trolley is controlled to move to the position where it is separated from the splicing pipe 7 at the starting station. Then, with the help of an external crane, the waste trolley is pulled out of the starting station. Finally, the waste trolley is put into the splicing pipe 7 in the starting station. After the waste trolley is reset, the controller controls the main hydraulic cylinder 4 to work, driving the U-shaped pusher 5 to move back (to make reasonable space for the next placement of the splicing pipe 7). During the U-shaped pusher 5 retraction process, it first deviates from the annular pusher 6 and pulls the support frame 43 and guide cylinder 47 outward. The support frame 43 is limited by the support slide 44 and the support slider 45, so it can only slide up and down relative to each other in the U-shaped pusher 5. Therefore, when the support frame 43 is retracted, it is limited to move downward by the guide rail 46, thereby driving the extension plate 48 and the cleaning plate 41 to follow and fall, so that the cleaning plate 41 is attached to the surface of the guide rail 10.

[0057] The continuous pull-back movement of the U-shaped pusher 5 can drive the annular pusher 6 to pull back and reset, and at the same time drive the cleaning plate 41 attached to the surface of the guide rail 10 to move along with it, so as to clean the debris on the surface of the guide rail 10.

[0058] A method for using a launching platform for an ultra-large cross-section rectangular steel-concrete jacking structure includes the following steps:

[0059] S1. First, position the external crane at a suitable position above the starting station, and at the same time confirm that the foundation structure of the starting platform (the back plate 1 and the bottom plate 3, which are composed of steel plates and concrete, and the steel structure 2 on the bottom plate 3 for prefabricating and installing the guide rail 10) is installed firmly. Then, use the crane's U-shaped gripper to clamp the prestressed reinforced concrete spliced ​​pipe 7 prepared above the starting station to complete the initial positioning after clamping the pipe.

[0060] S2. Then the crane drives the gripper and splicing pipe 7 to descend. The lower surface of the splicing pipe 7 first contacts the upper push frame 20 inside the straightening main frame 8, pushing the two upper push frames 20 to move outward, which in turn drives the upper push rod 21 and the upper end of the push arm 22 to move outward synchronously. Under the limiting action of the second straightening fixing shaft 49 and the upper limit hole 25, the lower end of the push arm 22 moves inward, driving the upper end of the connecting arm 16 and the straightening arm 12 to move inward. With the limiting action of the straightening slide 14 and the first straightening fixing shaft 13, the straightening wheel 11 at the lower end of the straightening arm 12 moves outward, away from the middle of the base plate 3, making enough space for the splicing pipe 7 to descend.

[0061] S3. As the spliced ​​pipe 7 continues to descend, its lower surface contacts the lower push frame 17 and then separates from the upper push frame 20. The pipe pushes the lower push frame 17 (which only moves left and right under the limit of the limit slide groove 18 and the limit slider 19), the first correction connecting shaft 15, and the upper end of the correction arm 12 to move outward, which drives the correction wheel 11 to move inward. As the pipe continues to descend, the correction wheel 11 on the inward side assists in positioning the pipe. If the pipe is seriously biased to one side, it will slide along the upper inclined surface of the lower push frame 17 to the middle to assist in the correction work.

[0062] S4. After the splicing pipe 7 is roughly positioned and placed on the guide rail 10, the trolley drives the gripper to disengage from the splicing pipe 7 and rise. During the rising process, the gripper contacts the push frame 20 from below and pushes it inward, driving the straightening wheel 11 away from the splicing pipe 7 to avoid affecting the subsequent jacking.

[0063] S5. The main hydraulic cylinder 4 on the back plate 1 is started by the controller. The main hydraulic cylinder 4 pushes the U-shaped pusher 5 (sliding in the ring pusher 6) forward. When the U-shaped pusher 5 moves, the push plate 28 on one side pushes the sliding frame 30 (slidingly connected to the fixed rails 29 on both sides of the ring pusher 6) and the limiting frame 31 forward until the U-shaped pusher 5 fits against the ring pusher 6. At this time, the limiting frame 31 is fully pushed out and contacts the splicing pipe 7 together with the U-shaped pusher 5 and the ring pusher 6. The inclined surface and the inner horizontal surface of the limiting frame 31 are used to perform secondary correction on the pipe to ensure that the pipe is stably pushed along the guide rail 10.

[0064] S6. If the shield cutter head contacts hard ground, the pressure of the main hydraulic cylinder 4 will increase suddenly. The pressure sensor at its end will transmit the signal to the controller, which will control the compensating push rod 32 to pull back the first-stage push frame 33, the first-stage push arm 38, the second-stage push arm 39, the third-stage push arm 40 and the second-stage push frame 36 (connected to the U-shaped push frame 5 through the support rod 37) at a uniform speed. The pullback speed is less than the feed speed of the main hydraulic cylinder 4 to ensure that the pipeline advances slowly. If the pressure does not decrease after the compensating push rod 32 is pulled back to the set distance, the stroke sensor will trigger an emergency stop to remind the staff to replace the cutter head or investigate the geology. If the main hydraulic cylinder 4 bursts or the geology is soft and causes the spliced ​​pipeline 7 to tilt, the laser level detector inside the structure will detect the abnormal position and angle of the cutter head in real time and immediately control the main hydraulic cylinder 4 and the compensating push rod 32 to stop. The operation will resume after the staff has inspected the equipment or dealt with the internal environment of the pipeline.

[0065] S7. After each pipe jacking operation, the waste material is first injected into the waste trolley. The waste trolley is then moved out of the starting station by a crane. After cleaning, the trolley is reset in the spliced ​​pipe 7. Then, the controller controls the main hydraulic cylinder 4 to drive the U-shaped pusher 5 to pull back. During the pull-back process, the U-shaped pusher 5 and the annular pusher 6 are misaligned, pulling the support frame 43 (limited by the support slide groove 44 and the support slider 45, only sliding up and down) and the guide cylinder 47 (slidably connected to the guide rail 46 on the inner side of the annular pusher 6) in the inner cavity 42 of the U-shaped pusher 5 to move outward. The bending structure of the guide rail 46 causes the support frame 43 to move down, driving the cleaning plate 41 (matching the shape of the guide rail 10, with a soft material at the bottom) at one end of the extension plate 48 to fit against the guide rail 10. As the U-shaped pusher 5 continues to pull back, the cleaning plate 41 moves with it to clean the debris on the surface of the guide rail 10. At the same time, the annular pusher 6 is reset with the pull-back of the U-shaped pusher 5, which is ready for the next pipe lowering and jacking.

[0066] The present invention has the following technical advantages.

[0067] 1. This invention utilizes a linkage correction structure consisting of the upper pusher 20, the lower pusher 17, and the correction wheel 11. During the descent of the pipeline, the correction wheel 11 can be automatically driven to move outward to create space and then inward to assist in positioning. If the pipeline deviates, it can be automatically corrected by the inclined surface of the lower pusher 17 without the need for manual intervention. This not only improves the accuracy of pipeline positioning but also reduces manual operation steps, enhances safety, and increases positioning efficiency, laying a good foundation for subsequent jacking operations.

[0068] 2. In this invention, while the U-shaped pusher 5 and the annular pusher 6 work together to push, the pusher plate 28 can drive the sliding frame 30 and the limiting frame 31 to automatically push out along the inclined fixed rail 29. When the U-shaped pusher 5 and the annular pusher 6 are in contact, the limiting frame 31 can perform secondary correction on the spliced ​​pipe 7 through its own structure. This design allows the jacking and correction actions to be carried out simultaneously, avoiding construction deviations caused by offset during pipe advancement, ensuring that the pipe always moves stably along the guide rail 10, effectively improving the straightness and engineering quality of pipe jacking construction, while saving the time of setting up a separate correction process and improving the overall construction efficiency.

[0069] 3. This invention achieves real-time monitoring and precise control through pressure sensors and laser level detectors. When encountering hard ground, the compensation push rod 32 can drive the relevant push frame and push arm to slowly pull back, ensuring the slow advancement of the pipeline to cooperate with the cutter head operation. When the pressure is continuously too high, it can also trigger an emergency stop to avoid equipment overload damage. In the event of hydraulic cylinder explosion or pipeline tilting, the laser level detector can quickly control the equipment to stop, preventing the accident from escalating. This multi-level abnormal response mechanism greatly improves the safety and stability of construction, reduces the construction period delay and equipment maintenance costs caused by abnormal situations, and reduces construction risks.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A launching platform for a super-large cross-section rectangular pipe jacking steel-concrete structure, comprising a back plate (1), a base plate (3) fixedly installed at the bottom of the back plate (1), a steel structure (2) fixedly installed on the base plate (3), a guide rail (10) fixedly installed on the steel structure (2), an annular pusher (6), a U-shaped pusher (5) sliding within the annular pusher (6), and multiple splicing pipes (7) placed on the top of the guide rail (10), multiple symmetrically distributed main hydraulic cylinders (4) fixedly installed on the surface of the back plate (1), and the U-shaped pusher (5) positioned at one end of the multiple main hydraulic cylinders (4), characterized in that, Two symmetrically distributed correction main frames (8) are fixedly installed on the top of the base plate (3). A first correction fixing shaft (13) is fixedly installed in each of the two correction main frames (8). A correction arm (12) is slidably connected to the surface of each first correction fixing shaft (13) through a correction slide groove (14). Two correction wheels (11) are rotatably connected to both sides of each correction arm (12) near the lower end. A first correction connecting shaft (15) is fixedly installed in the position of each correction arm (12) near the upper end. The same connecting arm (16) is rotatably connected to both ends of the first correction connecting shaft (15). A lower push frame (17) is fixedly connected to one end of each connecting arm (16). A second correction connecting arm is fixedly installed on the inner side of each connecting arm (16). Shaft (27), each of the second correction connecting shafts (27) has a push arm (22) slidably connected to its surface through a lower limit hole (26), each of the correction main frames (8) has a fixed frame (24) fixedly installed on one side, the fixed frame (24) has a second correction fixed shaft (49) fixedly installed inside, each of the push arms (22) has a upper limit hole (25) slidably connected to the surface of the second correction fixed shaft (49), each of the push arms (22) has a reset connecting shaft (23) fixedly installed near the upper end, both ends of the reset connecting shaft (23) have an upper push rod (21) slidably connected to the same upper push rod (21) slidably connected inside the correction main frame (8), and one end of each upper push rod (21) has an upper push frame (20) fixedly installed.

2. The launching platform for a super-large cross-section rectangular pipe jacking steel-concrete structure according to claim 1, characterized in that, Each of the correction main frames (8) has two symmetrically distributed limiting slides (18), and each of the limiting slides (18) has a limiting slider (19) that is fixedly installed on the surface of the lower push frame (17) and is slidably connected therein.

3. The launching platform for a super-large cross-section rectangular pipe jacking steel-concrete structure according to claim 2, characterized in that, Two symmetrically distributed guide plates (9) are fixedly installed on one side of each limiting slide (18) near the upper end.

4. The launching platform for a super-large cross-section rectangular pipe jacking steel-concrete structure according to claim 1, characterized in that, The annular pusher (6) has four symmetrically distributed fixed rails (29) fixedly installed on both sides. The same sliding frame (30) is slidably connected to the surface of each pair of adjacent fixed rails (29). Each sliding frame (30) has a limiting frame (31) fixedly installed on one side to lock and limit the splicing pipe (7). The U-shaped pusher (5) has two symmetrically distributed push plates (28) fixedly installed on one side that can contact the sliding frame (30).

5. The launching platform for a super-large cross-section rectangular pipe jacking steel-concrete structure according to claim 1, characterized in that, Each of the main hydraulic cylinders (4) is fixedly mounted with a first-stage pusher (33) at one end. Each of the main hydraulic cylinders (4) is fixedly mounted with a compensation pusher (32) partially placed outside the main hydraulic cylinder (4). Each of the compensation pushers (32) is fixedly mounted with a push block (35) at the output end. Each of the push blocks (35) has two secondary push arms (39) rotating on both sides. Each of the secondary push arms (39) has a first-stage push arm (38) hinged to one side of the first-stage pusher (33) rotating on the inner side. Each of the secondary push arms (39) has a third-stage push arm (40) hinged to one side of the secondary pusher (36) rotating on the surface. Each of the secondary pushers (36) has a support rod (37) fixedly mounted on one side. The support rod (37) is fixedly mounted on one side of the U-shaped pusher (5).

6. The launching platform for a super-large cross-section rectangular pipe jacking steel-concrete structure according to claim 5, characterized in that, Each of the first-level pushers (33) has two symmetrically distributed and fixedly installed limit rods (34) on one side of the second-level pusher (36).

7. The launching platform for a super-large cross-section rectangular pipe jacking steel-concrete structure according to claim 1, characterized in that, The U-shaped pusher (5) has an inner cavity (42) inside, and a support frame (43) is slidably connected inside the inner cavity (42). Multiple guide cylinders (47) are rotatably connected inside the support frame (43). Multiple guide rails (46) are fixedly installed on the inner side of the annular pusher (6). The number of guide cylinders (47) and guide rails (46) is the same. Multiple guide cylinders (47) are slidably connected to different guide rail (46) surfaces. Two symmetrically distributed extension plates (48) are fixedly installed on one side of the support frame (43). A cleaning plate (41) that can contact the guide rail (10) is fixedly installed at one end of each of the two extension plates (48).

8. The launching platform for a super-large cross-section rectangular pipe jacking steel-concrete structure according to claim 7, characterized in that, The U-shaped pusher (5) has two symmetrically distributed support grooves (44) that communicate with the inner cavity (42). Each support groove (44) is slidably connected to a support slider (45) that is fixedly installed on the surface of the support frame (43).

9. A method for using a launching platform for an ultra-large cross-section rectangular steel-concrete jacking structure, characterized in that, Includes the following steps: S1. First, position the external crane at a suitable position above the starting station, and at the same time confirm that the foundation structure of the starting platform is installed firmly. Then, use the crane's U-shaped gripper to clamp the prestressed reinforced concrete spliced ​​pipe 7 prepared above the starting station to complete the initial positioning after clamping the pipe. S2. Then the crane drives the gripper and splicing pipe 7 to descend. The lower surface of the splicing pipe 7 first contacts the upper push frame 20 inside the straightening main frame 8, pushing the two upper push frames 20 to move outward, which in turn drives the upper push rod 21 and the upper end of the push arm 22 to move outward synchronously. Under the limiting action of the second straightening fixing shaft 49 and the upper limit hole 25, the lower end of the push arm 22 moves inward, driving the upper end of the connecting arm 16 and the straightening arm 12 to move inward. With the limiting action of the straightening slide 14 and the first straightening fixing shaft 13, the straightening wheel 11 at the lower end of the straightening arm 12 moves outward, away from the middle of the base plate 3, making enough space for the splicing pipe 7 to descend. S3. As the spliced ​​pipe 7 continues to descend, its lower surface contacts the lower pushed frame 17 and then separates from the upper pushed frame 20. The pipe pushes the lower pushed frame 17, the first straightening connecting shaft 15, and the upper end of the straightening arm 12 to move outward, which in turn drives the straightening wheel 11 to move inward. As the pipe continues to descend, the straightening wheel 11 on the inward side assists in positioning the pipe. S4. After the splicing pipe 7 is roughly positioned and placed on the guide rail 10, the trolley drives the gripper to disengage from the splicing pipe 7 and rise. During the rising process, the gripper contacts the push frame 20 from below and pushes it inward, driving the straightening wheel 11 away from the splicing pipe 7 to avoid affecting the subsequent jacking. S5. Start the main hydraulic cylinder 4 on the back plate 1. The main hydraulic cylinder 4 pushes the U-shaped pusher 5 forward. When the U-shaped pusher 5 moves, the push plate 28 on one side pushes the sliding frame 30 and the limiting frame 31 forward until the U-shaped pusher 5 fits against the annular pusher 6. At this time, the limiting frame 31 is fully pushed out and contacts the splicing pipe 7 together with the U-shaped pusher 5 and the annular pusher 6. The pipe is then corrected a second time by the inclined surface and the inner horizontal surface of the limiting frame 31 to ensure that the pipe is stably advanced along the guide rail 10.

10. The method of using a launching platform for an ultra-large cross-section rectangular steel-concrete jacking structure according to claim 9, characterized in that, It also includes the following steps: S6. If the shield cutter head contacts hard ground, control the compensation push rod 32 to pull back the first-stage push frame 33, the first-stage push arm 38, the second-stage push arm 39, the third-stage push arm 40 and the second-stage push frame 36 at a uniform speed. S7. After each pipe jacking operation, the waste material is first injected into the waste trolley. The waste trolley is then moved out of the starting station by a crane. After cleaning, the trolley is reset into the splicing pipe 7. Then, the main hydraulic cylinder 4 drives the U-shaped pusher 5 to pull back. During the pull-back process, the U-shaped pusher 5 and the annular pusher 6 are misaligned, pulling the support frame 43 and guide cylinder 47 in the inner cavity 42 of the U-shaped pusher 5 to move outward. The bending structure of the guide rail 46 causes the support frame 43 to move down, which drives the cleaning plate 41 at one end of the extension plate 48 to fit against the guide rail 10. When the U-shaped pusher 5 continues to pull back, the cleaning plate 41 moves with it to clean the debris on the surface of the guide rail 10. At the same time, the annular pusher 6 is reset with the pull-back of the U-shaped pusher 5, which is ready for the next pipe lowering and jacking.

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