A large-section rectangular pipe jacking slag removal device and method thereof
By designing an adjustable-height slag hopper and a shaftless screw conveyor, combined with a hydraulically driven opening and closing plate and slag improvement components, the wear and adaptability issues of the slag discharge device of the rectangular pipe jacking machine were solved, achieving efficient and safe slag transportation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HENAN PROVINCIAL COMM PLANNING & DESIGN INST CO LTD
- Filing Date
- 2026-01-26
- Publication Date
- 2026-06-02
AI Technical Summary
Existing rectangular pipe jacking machine muck removal devices are susceptible to impact and wear during ultra-large cross-section construction, have poor adaptability to complex muck conditions, and have unstable muck removal efficiency.
A slag conveying assembly was designed, comprising a detachably connected upper and lower slag hopper. The height of the upper slag hopper is adjusted by a lifting plate and a lifting component. Combined with a shaftless screw conveyor, a hydraulically telescopic cylinder-driven opening and closing plate, and a slag improvement component, the assembly achieves buffering, adjustment, and improvement of the slag, ensuring smooth slag conveying.
It effectively buffers impact forces, improves the service life of the equipment and its adaptability to complex slag and soil conditions, enhances slag removal efficiency and safety, reduces equipment wear and blockage, and improves the construction environment.
Smart Images
Figure CN122129279A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of slag removal technology for pipe jacking, and in particular to a slag removal device and method for ultra-large cross-section rectangular pipe jacking. Background Technology
[0002] With the continuous development of urban underground space, the construction of projects such as subway entrances and exits, underground utility tunnels, and underground roads is increasing. In these projects, ultra-large cross-section rectangular pipe jacking technology has been increasingly widely used due to its advantages such as effectively reducing land excavation, saving underground space, and high utilization rate of the formed cross-section. However, compared with circular cross-sections, rectangular cross-sections experience greater excavation resistance and poorer soil flowability in the lower area during jacking, posing a serious challenge to the muck removal system. As a core component of the rectangular pipe jacking machine, the efficiency and reliability of the muck removal system directly affect the construction progress and safety of the entire project. Currently, conventional rectangular pipe jacking machines mostly use a combination of screw conveyors and belt conveyors or muck trucks for muck removal. In practical applications, especially under conditions of ultra-large cross-sections, high moisture content, or cohesive muck, this method has the following significant drawbacks: First, the impact and wear problem at the muck outlet. There is a certain height difference between the screw conveyor outlet and subsequent transfer equipment (such as muck trucks). When slag is discharged at high speed, it exerts a tremendous impact on the slag hopper or transfer equipment below, easily leading to hopper structural deformation, loosening of connecting parts, and severe wear of the inner wall, resulting in frequent equipment maintenance and a short service life. Secondly, the slag discharge efficiency and adaptability are insufficient. The slag hopper height of existing slag discharge devices is usually fixed, and cannot be flexibly adjusted according to the properties of the slag (such as moisture and viscosity) and the discharge speed. When the slag is too viscous, it easily adheres and accumulates in the slag hopper, causing blockages; while when the slag is too thin, it is prone to gushing, polluting the working environment. The fixed structure is difficult to adapt to the complex and ever-changing slag conditions, limiting slag discharge efficiency.
[0003] Chinese patent document 202322879171.3 discloses a slag discharge device for the upper screw conveyor of a large-section rectangular pipe jacking machine, which solves the problem that the slag from the upper screw conveyor cannot accurately fall into the slag discharge trolley when using a vertically distributed screw conveyor for large-section pipe jacking.
[0004] However, the above-mentioned solutions have at least the following technical problems during implementation: the slag outlet is susceptible to impact wear, the equipment has poor adaptability to complex slag and soil conditions, and the slag discharge efficiency is unstable. Therefore, there is an urgent need to propose a slag discharge device and method for ultra-large cross-section rectangular pipe jacking. Summary of the Invention
[0005] In view of the above technical problems, this disclosure provides a slag discharge device and method for ultra-large cross-section rectangular pipe jacking, which solves the technical problems of slag discharge port being susceptible to impact wear, poor adaptability of equipment to complex slag and soil conditions, and unstable slag discharge efficiency in the prior art.
[0006] According to one aspect of this disclosure, a large-section rectangular pipe jacking slag removal device and method are provided, including a pipe jacking machine body with a slag outlet at its tail; the slag outlet is connected to the feed end of a screw conveyor, and a slag conveying assembly is installed at the outlet of the screw conveyor. The slag conveying assembly includes a detachably connected upper slag hopper and a lower slag hopper, a lifting plate is installed on the side of the upper slag hopper, and a lifting component is installed on the outside of the lifting plate for driving the lifting and lowering of the lifting plate to bear the impact force of the slag under slag discharge conditions; a slag conveying trolley is received below the slag conveying assembly for conveying slag.
[0007] In some embodiments of this disclosure, the lifting assembly includes a support platform fixed to the side of the lifting plate, at least one threaded rod abutting below the support platform, a fixing plate being installed in the middle of the threaded rod via a threaded sleeve, a slag hopper being installed on the fixing plate, a throttle handle being installed at the lower part of the threaded rod, and a locking hole being provided on the throttle handle.
[0008] In some embodiments of this disclosure, the screw conveyor is a shaftless screw conveyor, which includes an electric motor, a turntable mounted on the power output shaft of the electric motor, and the turntable connected to one end of the screw to drive the screw to rotate.
[0009] In some embodiments of this disclosure, a hinged plate is installed at the outlet of the auger conveyor, and the hinged plate is connected to a hydraulic telescopic cylinder to drive the hinged plate to move.
[0010] In some embodiments of this disclosure, a soil improvement component is also included, which includes an amendment storage tank connected to an injection pipeline via a pumping unit, and the outlet end of the injection pipeline is connected to a screw conveyor.
[0011] In some embodiments of this disclosure, the surface of the slag hopper is fixedly connected with bolts, the surface of the bolts is threaded with nuts, and both ends of the lifting plate are provided with positioning slots, which are used to install the slag hopper.
[0012] In some embodiments of this disclosure, a rectangular tube is fixedly installed at the bottom of the slag hopper, the output end of the rectangular tube is close to the side of the raised plate on the surface of the upper slag hopper, and a crystal curtain is installed at the bottom of the rectangular tube.
[0013] A method for slag removal from ultra-large cross-section rectangular pipe jacking, using an ultra-large cross-section rectangular pipe jacking slag removal device, includes the following steps: S1: Start the screw conveyor to transport the excavated soil generated by the main body of the pipe jacking machine backward and discharge it from the screw conveyor outlet; S2: Operate the lifting component to drive the lifting plate to rise and fall, so as to adjust the relative distance between its upper edge and the discharge port of the screw conveyor, thereby buffering the impact force of the falling slag and adapting to the slag discharge conditions. S3: After being guided and transitioned between the upper and lower slag hoppers, the slag falls into the slag conveying trolley located below the discharge port of the lower slag hopper. S4: Remove the fully loaded slag-carrying trolley and replace it with an empty one to continue operations.
[0014] In some embodiments of this disclosure, step S2 further includes the step of adjusting the lifting plate: unscrewing the nut from the outer surface of the bolt so that the nut is disengaged from the surface of the positioning groove, rotating the threaded rod so that the threaded rod rotates inside the threaded sleeve, causing the support plate to move upward, thereby adjusting the overall height of the lifting plate, and then rotating the nut again to fix the lifting plate on the surface of the slag hopper.
[0015] The beneficial effects of this invention are as follows: Effectively buffering impact and reducing wear, by adjusting the height of the upper slag hopper, the upper edge of which can maintain the optimal buffer distance with the discharge port of the screw conveyor, actively absorbs and dissipates the downward impact energy of the slag, thereby greatly reducing the impact on the slag hopper itself and the slag conveying trolley below, significantly reducing equipment deformation and wear, and extending service life.
[0016] Enhanced adaptability to various working conditions, the height can be flexibly adjusted to handle different properties of slag, including dryness, wetness, and viscosity. For cohesive soils, increasing the height prevents clogging; for highly fluid soils, decreasing the height prevents splashing. It can adapt to complex and varied geological conditions and is highly versatile.
[0017] It features high adjustment precision and excellent self-locking properties. Utilizing a threaded rod and threaded sleeve transmission method, it inherently possesses a self-locking function, maintaining a stable position at any height without the need for additional locking devices, ensuring safety and reliability. Furthermore, the threaded transmission allows for fine-tuning, precisely finding the optimal buffer position.
[0018] It is easy to operate and saves effort. A handle with a locking hole is set at the bottom of the threaded rod. The operator can use the lever to insert the locking hole for effortless operation, which reduces labor intensity and improves adjustment efficiency.
[0019] The connection is reliable and easy to maintain. The slag hopper is connected to the lifting plate via bolts, positioning slots, and nuts. It can withstand impacts, and when the slag hopper needs to be replaced due to normal wear, it can be quickly disassembled, greatly facilitating on-site maintenance and reducing downtime.
[0020] With strong anti-clogging ability, the shaftless spiral eliminates interference from the central shaft, making it particularly suitable for conveying viscous and easily entangled slag and soil. It can effectively prevent blockage and jamming during the conveying process, and is especially suitable for water-rich clay layers commonly found in rectangular jacking pipes.
[0021] A hydraulically operated telescopic cylinder-driven opening and closing plate is installed at the discharge port. This precisely controls the slag discharge flow rate and the opening degree of the discharge port, thus matching the capacity and replacement rhythm of the subsequent transfer equipment's slag conveying trolley. This prevents slag accumulation or flow interruption, achieving refined management of the slag discharge process. Powerful and stable in operation, the hydraulically driven system provides significant thrust, ensuring reliable operation of the opening and closing plate even when obstructed by slag, resulting in smooth operation and high reliability.
[0022] Improving the properties of construction waste from the source by injecting a modifier into the screw conveyor can reduce its stickiness, increase its fluidity and water-stopping properties. This not only reduces the conveying load on the screw conveyor but also indirectly reduces the impact at the discharge port and effectively prevents gushing.
[0023] A rectangular guide pipe and a flexible baffle are installed at the discharge port of the lower slag hopper. This effectively prevents splashing and suppresses dust. The flexible baffle effectively blocks splashing slag and dust escape without affecting the slag's descent, improving the working environment and meeting the requirements of green construction. The rectangular pipe also ensures that the slag falls accurately into the slag conveying trolley, preventing spillage. Attached Figure Description
[0024] Figure 1 This is a schematic diagram of the slag removal device for an ultra-large cross-section rectangular pipe jacking system. Figure 2 A schematic diagram of the slag conveying assembly of a large-section rectangular jacking pipe slag discharge device. Figure 3 Diagram showing the separation structure of the lifting plate and the upper slag hopper of the slag conveying component of an ultra-large cross-section rectangular jacking pipe slag discharge device. Figure 4 Schematic diagram of the lifting plate mechanism for the slag removal device of an ultra-large cross-section rectangular pipe jacking system; Figure 5 A schematic diagram of a spiral conveyor for a large-section rectangular pipe jacking muck removal device. Figure 6 A top view of a spiral conveyor for a large-section rectangular pipe jacking muck removal device; Figure 7 for Figure 6 Sectional view of plane AA; The components in the diagram are named as follows: 1. Upper slag hopper; 2. Bolt; 3. Nut; 4. Lifting plate; 5. Straight groove; 6. Positioning groove; 7. Support platform; 8. Fixing plate; 9. Threaded sleeve; 10. Threaded rod; 11. Support plate; 12. Turning handle; 13. Locking hole; 14. Lower slag hopper; 15. Rectangular tube; 16. Crystal curtain; 20. Screw conveyor; 21. Slag conveying assembly; 22. Slag conveying trolley; 23. Electric motor; 24. Turntable; 25. Screw; 26. Opening and closing plate; 27. Hydraulic telescopic cylinder. Detailed Implementation
[0025] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention. Example 1
[0026] This example discloses a slag removal device and method for ultra-large cross-section rectangular pipe jacking. (See also...) Figures 1 to 7 The system includes a main body of a pipe jacking machine, with a slag outlet at its tail. The slag outlet is connected to the feed end of a screw conveyor 20. A slag conveying assembly 21 is installed at the outlet of the screw conveyor 20. The slag conveying assembly 21 includes a detachably connected upper slag hopper 1 and a lower slag hopper 14. A lifting plate 4 is installed on the side of the upper slag hopper 1. A lifting assembly is installed on the outside of the lifting plate 4 to drive the lifting and lowering of the lifting plate 4 and to bear the impact force of the slag under the slag discharge condition. A slag conveying trolley 22 is attached below the slag conveying assembly 21 for conveying slag.
[0027] The lifting assembly includes a support platform 7 fixed to the side of the lifting plate 4. At least one threaded rod 10 is abutted against the support platform 7 via a support plate 11. A fixing plate 8 is installed in the middle of the threaded rod 10 via a threaded sleeve 9. The fixing plate 8 is installed with a slag hopper 1. A throttle 12 is installed at the lower part of the threaded rod 10. A locking hole 13 is opened on the throttle 12.
[0028] The screw conveyor 20 is a shaftless screw conveyor. The shaftless screw conveyor includes an electric motor 23. The power output shaft of the electric motor 23 is equipped with a turntable 24. The turntable 24 is connected to one end of the screw 25 to drive the screw 25 to rotate.
[0029] A hinged plate 26 is installed at the outlet of the screw conveyor 20. The hinged plate 26 is connected to a hydraulic telescopic cylinder 27 to drive the hinged plate 26 to move.
[0030] It also includes a soil improvement component, which includes an amendment storage tank. The amendment storage tank is connected to an injection pipeline via a pumping unit, and the outlet end of the injection pipeline is connected to a screw conveyor 20.
[0031] Bolts 2 are fixedly connected to the surface of the upper slag hopper 1, and nuts 3 are threaded onto the surface of the bolts 2. Positioning slots are provided at both ends of the lifting plate 4, and the upper slag hopper 1 is installed through the positioning slots via bolts 2. The positioning slots include straight slots 5 and positioning grooves 6.
[0032] A rectangular tube 15 is fixedly installed at the bottom of the slag hopper 14. The output end of the rectangular tube 15 is close to the side of the raised plate on the surface of the upper slag hopper. A crystal curtain 16 is installed at the bottom of the rectangular tube 15.
[0033] There are four bolts 2. The four bolts 2 are arranged in pairs or more and are symmetrically distributed at the front and rear ends of the top center of the slag hopper 1. The bolts 2 pass through the straight groove 5. The end of the nut 3 near the upper slag hopper 1 is in contact with the positioning groove 6.
[0034] The support platform 7 is located above the fixed plate 8. There are two threaded sleeves 9. The two threaded sleeves 9 are symmetrically distributed around the center of the right end surface of the fixed plate 8. The support platform 7 is located above the fixed plate 8 and the threaded sleeves 9 are arranged in pairs symmetrically, so that when the subsequent support plate 11 pushes upward, a vertical force closed loop is formed. The bending moment borne by the lifting plate 4 is evenly distributed to both sides of the fixed plate 8, reducing the risk of local deformation.
[0035] When the upper slag hopper 1 discharges slag, the slag first enters the interior of the lower slag hopper 14 through the upper slag hopper 1, and then slides down through the lower slag hopper 14 onto the surface of the rectangular tube 15 for slag transportation.
[0036] A method for slag removal from ultra-large cross-section rectangular pipe jacking, using an ultra-large cross-section rectangular pipe jacking slag removal device, includes the following steps: S1: Start the screw conveyor to transport the excavated soil generated by the main body of the pipe jacking machine backward and discharge it from the screw conveyor outlet; S2: Operate the lifting component to drive the lifting plate to rise and fall, so as to adjust the relative distance between its upper edge and the discharge port of the screw conveyor, thereby buffering the impact force of the falling slag and adapting to the slag discharge conditions. S3: After being guided and transitioned between the upper and lower slag hoppers, the slag falls into the slag conveying trolley located below the discharge port of the lower slag hopper. S4: Remove the fully loaded slag-carrying trolley and replace it with an empty one to continue operations.
[0037] Step S2 also includes adjusting the lifting plate: unscrew the nut from the outer thread of the bolt so that the nut is disengaged from the surface of the positioning groove, rotate the threaded rod, the threaded rod rotates inside the threaded sleeve, driving the support plate to move upward, thereby adjusting the overall height of the lifting plate, and then rotate the nut again to fix the lifting plate on the surface of the slag hopper.
[0038] Although some preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the invention.
[0039] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this application and their equivalents, this invention also intends to include these modifications and variations.
Claims
1. A large-section rectangular pipe jacking muck removal device, comprising a pipe jacking machine body and a muck outlet at its tail; characterized in that: The slag outlet is connected to the feed end of the screw conveyor. A slag conveying assembly is installed at the outlet of the screw conveyor. The slag conveying assembly includes a detachably connected upper slag hopper and a lower slag hopper. A lifting plate is installed on the side of the upper slag hopper. A lifting assembly is installed on the outside of the lifting plate to drive the lifting plate to rise and fall, and to bear the impact force of the slag under the slag discharge condition. A slag conveying trolley is supported below the slag conveying assembly for conveying slag. The lifting assembly includes a support platform fixed to the side of the lifting plate. At least one threaded rod is abutted below the support platform. A fixing plate is installed in the middle of the threaded rod through a threaded sleeve. The upper slag hopper is installed on the fixing plate. A throttle is installed at the lower part of the threaded rod. A locking hole is opened on the throttle.
2. The slag removal device for ultra-large cross-section rectangular pipe jacking as described in claim 1, characterized in that: The screw conveyor is a shaftless screw conveyor, which includes an electric motor. The power output shaft of the electric motor is mounted on a turntable, which is connected to one end of the screw to drive the screw to rotate.
3. The slag removal device for ultra-large cross-section rectangular pipe jacking as described in claim 1, characterized in that: A hinged plate is installed at the outlet of the screw conveyor, and the hinged plate is connected to a hydraulic telescopic cylinder to drive the hinged plate to move.
4. The slag removal device for ultra-large cross-section rectangular pipe jacking as described in claim 1, characterized in that: It also includes a soil improvement component, which includes an amendment storage tank. The amendment storage tank is connected to an injection pipeline via a pumping unit, and the outlet end of the injection pipeline is connected to a screw conveyor.
5. The slag removal device for ultra-large cross-section rectangular pipe jacking as described in claim 1, characterized in that: The surface of the upper slag hopper is fixedly connected with bolts, and the surface of the bolts is threaded with nuts. Both ends of the lifting plate are provided with positioning slots, and the upper slag hopper is installed through the positioning slots by bolts.
6. The slag removal device for ultra-large cross-section rectangular pipe jacking as described in claim 1, characterized in that: A rectangular tube is fixedly installed at the bottom of the slag hopper, and the output end of the rectangular tube is close to the side of the raised plate on the surface of the upper slag hopper. A crystal curtain is installed at the bottom of the rectangular tube.
7. A method for slag removal from ultra-large cross-section rectangular pipe jacking, using the ultra-large cross-section rectangular pipe slag removal device as described in any one of claims 1-6, characterized in that, Includes the following steps: S1: Start the screw conveyor to transport the excavated soil generated by the main body of the pipe jacking machine backward and discharge it from the screw conveyor outlet; S2: Operate the lifting component to drive the lifting plate to rise and fall, so as to adjust the relative distance between its upper edge and the discharge port of the screw conveyor, thereby buffering the impact force of the falling slag and adapting to the slag discharge conditions. S3: After being guided and transitioned between the upper and lower slag hoppers, the slag falls into the slag conveying trolley located below the discharge port of the lower slag hopper. S4: Remove the fully loaded slag-carrying trolley and replace it with an empty one to continue operations.
8. The slag removal method for ultra-large cross-section rectangular pipe jacking as described in claim 7, characterized in that: Step S2 also includes adjusting the lifting plate: unscrew the nut from the outer thread of the bolt so that the nut is disengaged from the surface of the positioning groove, rotate the threaded rod, the threaded rod rotates inside the threaded sleeve, driving the support plate to move upward, thereby adjusting the overall height of the lifting plate, and then rotate the nut again to fix the lifting plate on the surface of the slag hopper.