Antifriction device for promoting formation of uniform slurry sleeve, pipe jacking system and method

Abstract

The invention belongs to the technical field of underground engineering pipe jacking construction, and discloses an antifriction device for promoting formation of a uniform slurry sleeve, a pipe jacking system and a method, and the antifriction device is composed of a rectangular steel pipe jacking section, a chain annular guide groove, a chain type operation device with a tool bit, a motor gear driver and a grouting pipe. A motor drives a chain with a tool bit to rotate along an annular guide groove in the outer wall of a pipe joint to cut a soil body, a pipe-soil gap is actively formed, meanwhile, a grouting pipe sprays slurry towards the movement track of the chain, and the slurry is evenly brought into the gap through mechanical force of rotation of the chain. By adopting the device, a continuous and uniform slurry sleeve can be formed, the side friction resistance of a pipe joint is remarkably reduced, the device is particularly suitable for a large-section long-distance jacking working condition, meanwhile, the defects of structural complexity and high energy consumption of a traditional stirring device are overcome, and the process reliability and economical efficiency are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of underground engineering pipe jacking construction, and particularly relates to a friction reduction device, a pipe jacking system and a method for promoting the formation of a uniform mud casing. Background Art

[0002] In recent years, the accelerated pace of urbanization and the continued expansion of underground space development have driven the widespread application of rectangular pipe jacking construction technology. With significant advantages such as high cross-sectional utilization, minimal cover depth requirements, and high construction precision, this technology plays a vital role in urban rail transit (such as subway stations), underground utility corridors, and underground pedestrian passages. It not only effectively reduces the impact of surface excavation on urban traffic and the surrounding environment, but also offers excellent construction safety and significant overall benefits, making it a key construction method for modern urban underground space development.

[0003] In rectangular pipe jacking construction, grouting to reduce friction is a key process for controlling jacking resistance. Currently, the industry generally adopts a process that combines simultaneous grouting with intermittent grouting. However, existing technologies have significant drawbacks: due to the geometric characteristics of the rectangular cross-section, the slurry tends to accumulate toward the bottom plate under the action of gravity, resulting in the formation of "cavities" at the corners of the top plate and the side walls. Furthermore, the equally spaced design of the grouting holes fails to take into account the stress distribution characteristics of the cross-section, resulting in insufficient grouting coverage in areas such as the middle of the top plate and the intersection of the side walls and the bottom plate. Although attempts have been made to improve the situation by adding grouting holes, performing multi-point grouting, or using mechanical stirring devices, it is still difficult to ensure uniform distribution of the slurry due to the structural characteristics of the cross-section. Furthermore, mechanical stirring devices have problems such as complex structure, high risk of failure, difficult installation, high energy consumption, and insufficient economic efficiency. Furthermore, a solution that achieves dynamic friction reduction through a chain-type operating device cannot meet the needs of long-term and stable friction reduction due to its high requirements for slurry viscosity adaptability and the need for regular maintenance due to the wear of chain transmission components.

[0004] In summary, the existing technology makes it difficult for the slurry to form a uniform and stable mud sheath between the rectangular jacking pipe and the soil, resulting in large friction resistance on the side of the pipe segment, which restricts the application effect of rectangular jacking technology in engineering projects, especially in large-section and long-distance jacking conditions. The problem is more prominent. Summary of the Invention

[0005] The present invention provides a friction reduction device, a pipe jacking system and a method for promoting the formation of a uniform mud casing. The friction reduction device can effectively form a relatively uniform mud casing between the pipe and the soil, convert the dry friction between the pipe and the soil into wet friction, and reduce the lateral friction resistance of the pipe joint.

[0006] In order to achieve the above object, the present invention adopts the following technical contents: A friction reducing device for promoting uniform mud jacket formation includes a rectangular steel jacking section; A chain annular guide groove is provided on the outer wall of one end of the rectangular steel top pipe section; A chain-type operating device with a cutter head that can rotate along the chain annular guide groove is provided in the chain annular guide groove; A motor gear driver is provided on the inner wall of the rectangular steel top pipe section; The motor gear driver is connected to the chain-type operating device with a cutter head; The motor gear driver can drive the chain-type operating device with a cutter head to rotate, cutting the soil to form a gap between the pipe and the soil; A grouting pipe is inserted into the rectangular steel top pipe section; the injection direction of the grouting pipe is set toward the movement trajectory of the chain-type operating device with a cutter head, so that the sprayed mud is rotated by the chain-type operating device with a cutter head to the gap between the pipe and the soil.

[0007] Furthermore, the inner wall of the rectangular steel top pipe section is provided with multiple groups of cross steel ribs; The cross steel ribs include a plurality of longitudinal steel ribs and a plurality of transverse steel ribs; The longitudinal steel ribs are evenly arranged along the jacking direction; The transverse steel rib is arranged perpendicular to the jacking direction and is located at the projection of the chain annular guide groove to the rectangular steel jacking pipe section.

[0008] Furthermore, chain anti-deflection ridges are respectively provided at both ends of the bottom of the chain annular guide groove, and the chain-type operating device with a cutter head is provided between the two chain anti-deflection ridges for limiting the position of the chain-type operating device with a cutter head; The cross section of the chain anti-deflection rib is a right triangle with concave curved sides, and the concave curved sides of the chain anti-deflection rib are recessed toward both sides of the chain annular guide groove 1-1-1.

[0009] Furthermore, the motor gear driver includes a driving motor, a transmission gear, a speed regulating gear box and a fixed base plate; The driving motor is mounted on the inner wall of the rectangular steel top pipe section through the fixed base plate; The driving motor is connected to the speed regulating gear box to achieve speed ratio adjustment; the output end of the driving motor is connected to the transmission gear; The tooth end of the transmission gear protrudes from the surface of the chain annular guide groove and is meshed and connected with the chain-type operating device with a cutter head.

[0010] Furthermore, the chain-type operating device with a cutter head comprises a plurality of chain-driven cutter groups connected in sequence; The chain drive knife group includes a rotary cutting chain, a mud breaking knife head and a chain knife long bolt; The peeling chain is connected to the output end of the motor gear driver; The peeling chain is provided with a chain bolt hole, through which the connection between two adjacent chain drive knife groups is realized; A cutter head bolt hole is also provided on the top of the peeling chain; the mud breaking cutter head is connected to the peeling chain through the cutter head bolt hole and the chain cutter long bolt.

[0011] Furthermore, the grouting pipe includes a main grouting pipe, upper and lower side branch grouting pipes, left and right side branch grouting pipes, a first slurry distributor, and a second slurry distributor; The main grouting pipe includes a main grouting inlet pipe and a main grouting outlet pipe; The main grouting inlet pipe is connected to the left and right branch grouting pipes and the main grouting outlet pipe respectively through a first slurry distributor; The left and right branch grouting pipes are connected to the upper and lower branch grouting pipes to form a closed loop pipeline; The upper and lower branch grouting pipes are connected to the second slurry distributor; A plurality of grouting holes are provided around the chain annular guide groove; The second slurry distributor is correspondingly arranged at the grouting hole and is connected to the grouting hole. The injection direction of the grouting hole is set toward the movement track of the chain-type operating device with a cutter head.

[0012] Furthermore, one end of the rectangular steel jacking pipe section is connected to the first concrete pipe section or the jacking machine head through a bent bolt, and the other end is connected to the second concrete pipe section through a bent bolt.

[0013] Furthermore, a front socket joint is provided at one end of the rectangular steel top pipe section, and a rear socket joint is provided at the other end; the cross section of the front socket joint is eagle-beak shaped.

[0014] A method for operating a friction reducing device for promoting uniform mud casing formation is provided, based on the friction reducing device for promoting uniform mud casing formation, comprising: Start the motor gear driver to drive the chain annular guide groove of the cutter head chain operating device to rotate; During the rotation of the chain-type operating device with a cutter head, the soil is cut to form a gap between the pipe and the soil, and at the same time, the mud sprayed from the grouting pipe is swirled into the gap between the pipe and the soil.

[0015] A rectangular pipe jacking system includes the above-mentioned friction reducing device for promoting the formation of a uniform mud jacket; One end of the friction reducing device for promoting the formation of uniform mud jacket is connected to the first concrete pipe section or the head of the pipe jacking machine, and the other end is connected to the second concrete pipe section.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The application provides a friction reduction device for promoting uniform mud sleeve formation, which is composed of a rectangular steel jacking pipe section, a chain ring guide groove, a chain type operation device with a cutter head, a motor gear driver and a grouting pipe. Through the motor driving the chain with a cutter head to rotate and cut the soil along the ring guide groove on the outer wall of the pipe section, a pipe-soil gap is actively formed, and the grouting pipe sprays mud towards the movement track of the chain, and the mechanical force of the rotating chain uniformly brings the mud into the gap. By the dual effects of dynamic mechanical cutting and slurry rotation, the device breaks through the limitations of traditional static grouting: on the one hand, the cutter head chain continuously cuts the soil to form a stable gap, solving the problem of slurry accumulation caused by geometric section; on the other hand, the rotating chain forcibly transports the slurry to the roof, corner of the side wall and other easy cavity areas, and the design of the grouting direction and the movement track is coordinated, so that the active diffusion of the mud is realized instead of relying on the natural flow of gravity. Finally, a continuous and uniform mud sleeve is formed, which significantly reduces the side friction of the pipe section, is especially suitable for large-section long-distance jacking conditions, avoids the structural complexity and high energy consumption defects of traditional mixing devices, and improves the process reliability and economy. Preferably, in the application, the cross-rib structure is arranged on the inner wall of the rectangular steel jacking pipe section, which enhances the overall stiffness of the pipe section, and the cooperation of the longitudinal ribs and the transverse ribs not only guarantees the stress requirement in the jacking direction, but also provides stable support for the chain ring guide groove, ensuring the smooth and reliable operation of the chain.

[0017] Preferably, in the application, the special cross-section designed chain deviation prevention rib effectively limits the chain through the concave curved edge right triangle structure, prevents the chain from deviating or derailing during high-speed operation, and improves the stability and safety of the device operation.

[0018] Preferably, in the application, the special cross-section designed chain deviation prevention rib effectively limits the chain through the concave curved edge right triangle structure, prevents the chain from deviating or derailing during high-speed operation, and improves the stability and safety of the device operation.

[0019] Preferably, in the application, the motor gear driver adopts a modular design, realizes speed ratio adjustment through a speed regulation gear box, adjusts the chain speed according to different geological conditions, and the protruding design of the transmission gear ensures reliable meshing with the chain, improving the adaptability and transmission efficiency of the system.

[0020] Preferably, in the application, the chain transmission cutter group adopts a modular connection design, the mud breaking cutter head is detachably connected through bolts, convenient for replacement and maintenance, the multi-hole design on the rotary cutting chain not only ensures the connection strength, but also realizes flexible arrangement of the cutter head, improving the practicality and economy of the device.

[0021] Preferably, in the present application, the grouting system adopts a main branch pipe closed loop design, and uniform distribution of slurry is achieved through two-stage distributors, and the grouting holes are arranged towards the chain movement track, so that the slurry is effectively spun by the chain to each part of the pipe, solving the problem of uneven coverage in the traditional grouting process.

[0022] Preferably, in the present application, the steel jacking pipe section and the concrete pipe section are connected by a bent bolt to form a rigid-flexible combined structure system, which not only ensures the connection strength, but also allows a certain deformation capacity to adapt to the complex stress state in the jacking process.

[0023] Preferably, in the present application, the front and rear bell and spigot interfaces adopt an eagle beak type cross section design, which improves the connection sealing and centering accuracy between pipe sections, reduces the risk of misalignment and leakage during jacking, and ensures the construction quality.

[0024] The application also provides a working method of the friction reduction device for promoting the formation of a uniform mud sleeve, based on the above-mentioned friction reduction device for promoting the formation of a uniform mud sleeve, the method drives the chain to rotate along the annular guide groove by starting the motor gear driver, and simultaneously realizes the dual functions of soil cutting and slurry spinning. When the chain rotates, the cutting head actively cuts the soil to form uniform gaps, eliminating the uneven distribution of slurry caused by the geometric characteristics of the cross section in the traditional process; at the same time, the injection direction of the grouting pipe is designed in cooperation with the chain movement track, so that the injected mud is forced into the easy cavity areas such as the roof and the corner of the side wall by the rotating chain, and the mechanical stirring replaces the pure reliance on the flow of slurry under gravity. This method breaks through the limitations of static grouting, utilizes the dynamic cutting-spinning integrated mechanism, not only overcomes the defects of complex structure and high energy consumption of traditional stirring devices, but also ensures the uniform filling of mud in the pipe-soil gap through continuous mechanical action. Finally, the stable formation of the mud sleeve is realized, effectively reducing the side friction resistance of the pipe section, especially suitable for large cross section long distance jacking conditions, while reducing the maintenance demand of the chain, improving the construction reliability and economy.

[0025] The application also provides a rectangular jacking pipe system, which includes the above-mentioned friction reduction device for promoting the formation of a uniform mud sleeve, and the system forms a combined jacking structure by integrating the friction reduction device for promoting the formation of a uniform mud sleeve between the concrete pipe sections or behind the jacking machine head. The dynamic cutting and slurry spinning functions of the chain of the friction reduction device complement the load-bearing characteristics of the concrete pipe section, and the chain type operation device actively forms the pipe-soil gap at the front end and uniformly distributes the mud, and the concrete pipe section can slide in the pre-formed mud sleeve with low resistance when jacked subsequently. The system solves the problem of uneven distribution of slurry in the rectangular cross section in the traditional process through spatial layout optimization, and the mechanical action of the chain overcomes the problem of slurry accumulation caused by gravity, so that the key parts such as the roof and the side wall can be effectively lubricated. Finally, the balance of the friction resistance of the whole jacking pipe system is realized, which significantly improves the stability and efficiency of large cross section long distance jacking construction, while maintaining the structural advantages of the concrete pipe section, and has process innovation and engineering practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic structural diagram of a friction reduction device for promoting uniform mud jacket formation provided by an embodiment of the present invention; Figure 2 A front view of a friction reduction device for promoting uniform mud jacket formation provided by an embodiment of the present invention; Figure 3 A side view of a friction reduction device for promoting uniform mud casing formation during rectangular pipe jacking tunneling provided by an embodiment of the present invention; Figure 4 A schematic diagram of the split structure of a rectangular steel jacking section of a friction reduction device for promoting uniform mud casing formation provided by an embodiment of the present invention; Figure 5 A schematic diagram of the chain annular guide groove structure of a friction reduction device that promotes uniform mud jacket formation provided by an embodiment of the present invention; Figure 6 A cross-sectional view of a chain annular guide groove of a friction reduction device for promoting uniform mud jacket formation provided by an embodiment of the present invention; Figure 7 A schematic diagram of a cross-rib structure of a friction reduction device for promoting uniform mud jacket formation provided by an embodiment of the present invention; Figure 8 A schematic structural diagram of a front socket joint of a friction reduction device for promoting uniform mud casing formation provided by an embodiment of the present invention; Figure 9 A schematic structural diagram of a rear socket joint of a friction reduction device for promoting uniform mud casing formation provided by an embodiment of the present invention; Figure 10 A schematic diagram of the structure of a motor gear driver for a friction reduction device that promotes uniform mud jacket formation provided by an embodiment of the present invention; Figure 11 A schematic structural diagram of a chain-type operating device with a cutter head, which is a friction reduction device for promoting uniform mud jacket formation, provided by an embodiment of the present invention; Figure 12 A schematic diagram of the chain drive cutter group structure of a friction reduction device for promoting uniform mud jacket formation provided by an embodiment of the present invention; Figure 13 A schematic diagram of the grouting pipe distribution of a friction reduction device that promotes uniform mud jacket formation provided by an embodiment of the present invention; Figure 14 A schematic diagram of the distribution of grouting pipes at the upper and lower ends of a friction reduction device for promoting uniform slurry jacket formation provided by an embodiment of the present invention; Figure 15 A schematic diagram of the distribution of grouting pipes at the left and right ends of a friction reduction device for promoting uniform slurry jacket formation provided by an embodiment of the present invention; Figure 16 A schematic diagram of the connection between a friction reduction device and a concrete pipe section to promote uniform slurry jacket formation according to an embodiment of the present invention; Figure 17 A schematic diagram of a bent bolt connection of a friction reduction device for promoting uniform mud jacket formation provided by an embodiment of the present invention.

[0027] Reference numerals: 1. Rectangular steel jacking pipe section; 2. Motor gear drive; 3. Chain-type operating device with cutter head; 4. Grouting pipe; 5. First concrete pipe section; 6. Second concrete pipe section; 7. Bent bolts; 1-1, main section of rectangular steel jacking pipe segment; 1-1-1, chain annular guide groove; 1-1-1-1, gear hole; 1-1-1-2, chain anti-deflection rib; 1-1-2, cross steel rib; 1-1-2-1, longitudinal steel rib; 1-1-2-2, transverse steel rib; 1-1-3, grouting hole; 1-1-4, pipe segment connection hole; 1-2, front socket joint; 1-3, rear socket joint; 2-1, drive motor; 2-2, transmission gear; 2-3, speed regulating gearbox; 2-4, fixed base plate; 2-4-1, connection hole; 3-1, chain drive cutter assembly; 3-1-1, peeling chain; 3-1-1-1, chain bolt hole; 3-1-2, mud-breaking cutter head; 3-1-2-1, cutter head bolt hole; 3-1-3, chain cutter long bolt; 4-1, main grouting pipe; 4-1-1, main grouting inlet pipe; 4-1-2, main grouting outlet pipe; 4-2, upper and lower branch grouting pipes; 4-3, left and right branch grouting pipes; 4-4, first slurry distributor; 4-5, second slurry distributor; 7-1. Bend the bolt holes. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail in the following specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are intended to fall within the scope of protection of the present invention.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0032] In the description of the embodiments of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0033] As mentioned in the background technology, in order to reduce the friction resistance of the pipe wall during rectangular pipe jacking construction, the industry generally adopts grouting friction reduction technology, which injects thixotropic mud into the space between the pipe and the soil to form a layer of mud sleeve, which is a key process link for controlling the jacking resistance. At present, in order to solve the significant technical defects of the existing grouting friction reduction technology in practical applications, attempts are made to improve the friction reduction effect by optimizing the grouting system, such as adding grouting holes or adopting a multi-point grouting arrangement. However, due to the structural characteristics of the rectangular cross-section, these improvement measures are still difficult to ensure the uniform distribution of mud around the pipe section; in addition, some solutions use mechanical stirring devices to maintain the fluidity of the mud, but such equipment is often complex in structure, which increases the risk of failure of the construction system, is difficult to install in the narrow gap between the pipe sections, has poor spatial adaptability, and has high energy consumption and insufficient economy. It can be seen that in the long-distance jacking construction of rectangular pipes, these technical limitations have led to the existing solutions still being unable to effectively meet the engineering requirements of rectangular pipe jacking construction for long-term and stable friction reduction effects.

[0034] In order to solve the above problems, this embodiment provides a friction reduction device that promotes the formation of a uniform mud sleeve. The use of this friction reduction device and construction method can effectively reduce the lateral friction resistance of the pipe joint, improve construction efficiency and project safety, and propose a systematic construction method in this direction, which provides a reference basis for the subsequent optimization of material durability and process adaptability.

[0035] This embodiment provides a friction reduction device for promoting the formation of a uniform mud jacket, comprising: a rectangular steel jacking section 1, a motor gear driver 2, a chain-type operating device with a cutter head 3, and a grouting pipe 4; Among them, the rectangular steel top pipe section 1 is consistent in size with the concrete pipe section during construction; The motor gear driver 2 is arranged between the left and right ends of the inner side of the rectangular steel top pipe section 1; The chain-type operating device 3 with a cutter head is arranged in the chain annular guide groove 1-1-1 on the outer side of the rectangular steel jacking pipe section 1; The grouting pipe 4 is distributed inside the rectangular steel top pipe section 1 to form a closed loop; The transmission gear 2 - 2 of the motor gear driver 2 is connected in series with the peeling chain 3 - 1 - 1 of the chain-type working device 3 with a cutter head.

[0036] Exemplarily, the rectangular steel jacking pipe section 1 includes a rectangular steel jacking pipe section main section 1-1, a front socket joint 1-2 and a rear socket joint 1-3; The front socket joint 1-2, the main section of the rectangular steel jacking pipe section 1-1 and the rear socket joint 1-3 are connected in sequence by welding; The front socket joint 1-2 is an eagle-beak type and can be matched with the rear socket joint 1-3.

[0037] For example, the main section 1-1 of the rectangular steel top pipe segment includes a chain annular guide groove 1-1-1, a cross steel rib 1-1-2, a grouting hole 1-1-3 and a pipe segment connection hole 1-1-4; The chain annular guide groove 1-1-1 is arranged on the outer surface of the rectangular steel top pipe section 1 near the front end, and the cross-sectional dimensions of the chain annular guide groove 1-1-1 are consistent on all sides; Cross steel ribs 1-1-2 are arranged on the inner side of the rectangular steel jacking pipe section 1 and are distributed along the longitudinal direction (jacking direction) and the transverse direction respectively; Grouting holes 1-1-3 are set at the chain annular guide groove 1-1-1, with three holes at the upper and lower ends and two holes at the left and right ends; The pipe segment connection holes 1-1-4 are set at the four corners of the rectangular steel jacking pipe segment 1, four at the front end and four at the rear end, for splicing with the jacking machine head and the concrete pipe segment.

[0038] Exemplarily, the chain annular guide groove 1-1-1 includes a gear through hole 1-1-1-1 and a chain anti-deflection rib 1-1-1-2; The gear through-hole 1-1-1-1 is set in the middle of the left and right ends of the chain annular guide groove 1-1-1; The chain anti-deflection ridges 1-1-1-2 are arranged on both sides of the bottom end of the chain annular guide groove 1-1-1, and the cross section is a right triangle with concave curved sides; Exemplarily, the cross steel rib 1-1-2 includes a longitudinal steel rib 1-1-2-1 and a transverse steel rib 1-1-2-2; The longitudinal steel ribs 1-1-2-1 are distributed along the longitudinal direction of the jacking; There are two longitudinal steel ribs 1-1-2-1 distributed in the transverse direction, forming a cross connection with the longitudinal steel ribs 1-1-2-1.

[0039] Exemplarily, the motor gear driver 2 includes a driving motor 2-1, a transmission gear 2-2, a speed regulating gear box 2-3 and a fixed base plate 2-4; The driving motor 2-1, the speed regulating gear box 2-3, the transmission gear 2-2 and the fixed base plate 2-4 are connected in sequence; The driving motor 2-1 adopts a three-phase asynchronous motor; the transmission gear 2-2 adopts a spur gear with a tooth direction parallel to the axis. The motor gear driver 2 is bolted to the rectangular steel top pipe section 1 according to the connection hole 2-4-1 on the fixed base plate 2-4.

[0040] As a preferred solution of this embodiment, the driving motor 2-1 drives the transmission gear 2-2 to rotate, and the speed ratio is adjusted through the speed regulating gear box 2-3.

[0041] Among them, the transmission gear 2-2 in the motor gear driver 2 extends out of the inner surface of the chain annular guide groove 1-1-1, but does not protrude out of the outer surface of the rectangular steel top pipe section 1, and is still in the chain annular guide groove 1-1-1.

[0042] The chain-type working device with cutter heads 3 is composed of multiple chain-driven cutter groups 3-1. The chain-driven cutter groups 3-1 include a peeling chain 3-1-1, a mud-breaking cutter head 3-1-2, and a long chain cutter bolt 3-1-3. The peeling chain 3-1-1 has a chain bolt hole 3-1-1-1, and the mud-breaking cutter head 3-1-2 has a cutter head bolt hole 3-1-2-1. The two are connected by the long chain cutter bolt 3-1-3. In this embodiment, the mud-breaking cutter head 3-1-2 protrudes 3 cm from the surface of the rectangular steel top pipe section 1.

[0043] The transmission gear 2 - 2 of the motor gear driver 2 is connected to the peeling chain 3 - 1 - 1 of the chain-type working device with a cutter head 3 through a chain transmission.

[0044] In this embodiment, the grouting pipe 4 includes a main grouting pipe 4-1, upper and lower branch grouting pipes 4-2, left and right branch grouting pipes 4-3, a first slurry distributor 4-4 and a second slurry distributor 4-5; The main grouting pipe 4-1 includes a main grouting inlet pipe 4-1-1 and a main grouting outlet pipe 4-1-2; The upper and lower branch grouting pipes 4-2 and the left and right branch grouting pipes 4-3 are connected to form a closed loop; There are two first slurry distributors 4-4, which are arranged on both sides of the rear end of the rectangular steel top pipe section 1 and connected to the main grouting pipe 4-1 and the left and right branch grouting pipes 4-3; There are eight second slurry distributors 4-5, which are arranged at each grouting hole 1-1-3 and are connected to the grouting hole 1-1-3.

[0045] For example, four bent bolt holes 7 - 1 are reserved at the four corners of the first concrete pipe section 5 , which are connected to the front socket joint 1 - 2 via bent bolts 7 .

[0046] Similarly, four bent bolt holes 7 - 1 are reserved at the four corners of the second concrete pipe section 6 , which are connected to the rear socket interface 1 - 3 through bent bolts 7 .

[0047] Based on the above-mentioned friction reducing device for promoting the formation of a uniform mud jacket, this embodiment further provides a working method of the friction reducing device for promoting the formation of a uniform mud jacket, and the specific steps are as follows: First, install the motor gear driver 2, the chain-type operating device with a cutter head 3, and the grouting pipe 4 on the rectangular steel jacking section 1. When jacking over short and medium distances, after the friction reduction device is installed, connect the front socket 1-2 of the friction reduction device to the jacking machine head, and connect the second concrete pipe section 6 to the rear socket 1-3 of the friction reduction device. When jacking over long distances, the friction reduction device can be added accordingly at the relay ring. At this time, both the front and rear ends of the friction reduction device are concrete pipe sections. When grouting is continuous, the slurry is injected into the friction reduction device from the main grouting inlet pipe 4-1-1, and flows into the upper and lower branch grouting pipes 4-2 and the left and right branch grouting pipes through the first slurry distributor 4-4. The slurry pipe 4-3 forms a closed-loop pipeline, and then the slurry is injected from the grouting hole 1-1-3 into the chain annular guide groove 1-1-1 and the outer side of the rectangular steel top pipe section 1 according to each second slurry distributor 4-5; under the action of the motor gear driver 2, the transmission gear 2-2 drives the chain type operation device 3 with a cutter head to operate. During the operation, the mud breaking cutter head 3-1-2 on the rotary cutting chain 3-1-1 rotates, and the slurry in the chain annular guide groove 1-1-1 is brought to the gap between the pipe and the soil, and protrudes from the outer wall 3 of the rectangular steel top pipe section 1. The 2-cm mud-breaking cutter head 3-1-2 can cut the soil to form a good gap of 2 cm-3 cm between the pipe and the soil, and thin the slurry accumulated between the pipe and the soil, such as the top, bottom and side wall of the rectangular steel jacking pipe section 1, and replenish the slurry to the parts with thinner mud thickness, so that the slurry forms a uniform mud sleeve of 2 cm-3 cm thick between the pipe and the soil; the starting time of the motor gear driver 2 is connected with the jacking device. When each pipe section is jacked, the drive motor 2-1 is started, and when the next pipe section is installed, the drive motor 2-1 is turned off. During this period, the slurry continues to flow into the pipe and the soil to prevent slurry shortage.

[0048] The friction reduction device for promoting uniform mud casing formation provided above was implemented and applied, and the specific implementation is as follows: This embodiment provides a friction reduction device that promotes the formation of a uniform mud sleeve, which mainly includes a rectangular steel jacking pipe section 1, a motor gear driver 2, a chain-type operating device with a cutter head 3, a grouting pipe 4, a first concrete pipe section 5, a second concrete pipe section 6, and a bent bolt 7 for connecting the rectangular steel jacking pipe section 1 with the jacking machine head and connecting the rectangular steel jacking pipe section 1 with the concrete pipe section.

[0049] The rectangular steel jacking pipe section 1 is the same size as the jacking pipe section, and is connected to the jacking machine head and the concrete pipe section respectively through the cooperation of the bent bolt 7 and the bent bolt hole 7-1; in this embodiment, there are two motor gear drivers 2, which are bolted to the fixed base plate 2-4 on the motor gear driver 2 and the rectangular steel jacking pipe section 1, and are respectively installed in the middle of the left and right ends of the inner side of the rectangular steel jacking pipe section 1; the chain-type operating device 3 with a cutter head is installed in the chain annular guide groove 1-2 on the outer side of the rectangular steel jacking pipe section 1, and is chain-drivenly connected to the transmission gear 2-2 of the motor gear driver 2 through the chain drive group 3-1 of the chain-type operating device with a cutter head.

[0050] In this embodiment, when the friction-reducing device is connected to the head of the pipe jacking machine and the concrete pipe section, a circle of flexible material such as a rubber sealing ring or a special-shaped rubber pad is added to the socket joint. By screwing and squeezing the bolts, the flexible material can effectively reduce the impact of vibration and uneven settlement on the pipe section, and can also play a sealing and water-stopping role to prevent groundwater from seeping into the pipe section.

[0051] In this embodiment, four connection holes 2-4-1 are reserved at the four corners of the fixed base plate 2-4 of the motor gear driver 2, and bolt holes are reserved on the corresponding rectangular steel top pipe section 1, which correspond one-to-one to the connection holes 2-4-1. The motor gear driver 2 is installed and fixed on the rectangular steel top pipe section 1 by bolts.

[0052] Combine Figure 4 、 Figure 8 and Figure 9 As shown, the front socket joint 1-2 has an eagle-beak cross-section, with a sloped upper portion to reduce pressure from the top soil or backfill on the joint. This also guides the pipe joints into a smooth connection during jacking, reducing the risk of sticking. The lower portion is stepped, creating a water-retaining step at the lower joint. Combined with a sealing rubber ring, this effectively blocks groundwater or mud from seeping in through the joint, reducing leakage risks.

[0053] like Figure 5As shown, the chain annular guide groove 1-1-1 is opened on the outer side of the rectangular steel top pipe section 1 near the front end, and a groove is cut inward from the outer wall, surrounding the rectangular steel top pipe section 1; when the chain-type operating device 3 with a cutter head works in the chain annular guide groove 1-1-1, the chain annular guide groove 1-1-1 is provided with two chain anti-deflection ridges 1-1-1-2 at the inner bottom ends to limit the left and right movement of the peeling chain 3-1-1, reduce working energy consumption, reduce friction on the inner wall of the guide groove, and increase the service life of the peeling chain 3-1-1 and the mud breaking cutter head 3-1-2.

[0054] like Figure 6 As shown, in this embodiment, the cross-section of the chain anti-deflection rib 1-1-1-2 is a right triangle with concave curved sides, and the concave curved sides are concave on both sides of the chain annular guide groove 1-1-1. Under the premise of limiting the left and right movement of the peeling chain 3-1-1 and not hindering its normal operation, the working space of the chain-type operating device with a cutter head 3 is greatly improved.

[0055] like Figure 1 and Figure 7 As shown, due to the provision of a chain annular guide groove 1-1-1 on the outer wall of the rectangular steel jacking pipe section 1, the pipe section has a variable cross-section. At locations with smaller cross-sections, its strength is significantly reduced. Furthermore, when the motor gear driver 2 drives the cutter-chain operating device 3, the rectangular steel jacking pipe section 1 is subjected to strong pressure and shear forces. Therefore, multiple cross steel ribs 1-1-2 are provided on the inside of the pipe section. Multiple equally spaced longitudinal steel ribs 1-1-2-1 are provided along the jacking direction. Two transverse steel ribs 1-1-2-2 are provided perpendicular to the jacking direction, where the chain annular guide groove 1-1-1 projects onto the rectangular steel jacking pipe section 1. These ribs surround the rectangular steel jacking pipe section 1 and are disconnected at the location where the motor gear driver 2 is installed to facilitate driver installation. The steel ribs in the two directions form a cross-connection. The provision of these cross steel ribs effectively compensates for the insufficient strength at the variable cross-section location, enhances the integrity of the device, and improves construction safety.

[0056] like Figure 2 and Figure 10 As shown, two motor gear drivers 2 are installed in the middle of the two ends of the inner side of the rectangular steel top pipe section 1. The motor gear driver 2 consists of a driving motor 2-1, a transmission gear 2-2, a speed regulating gear box 2-3 and a fixed base plate 2-4. The transmission gear 2-2 extends out of the inner surface of the chain annular guide groove 1-1-1, but does not exceed the outer wall of the rectangular steel top pipe section 1, so as to facilitate the engagement and connection with the peeling chain 3-1-1 of the chain-type operating device 3 with a cutter head; a fixed base plate 2-4 is provided on the side of the speed regulating gear box 2-3, and four connection holes 2-4-1 are reserved on the four top corners of the fixed base plate 2-4 for bolt connection with the rectangular steel top pipe section 1.

[0057] In this embodiment, the driving motor 2-1 of the motor gear driver 2 adopts a three-phase asynchronous motor, and the speed ratio can be adjusted through the speed regulating gear box 2-3. When the jacking pipe is pushed in, the parameters of the motor gear drivers 2 on both sides are set to be consistent. The speed of the transmission gear 2-2 can be adjusted according to actual needs to drive the working intensity of the chain-type operating device 3 with a cutter head. The motor gear driver 2 enhances the controllability of the device and also improves the work efficiency of the construction.

[0058] like Figure 1 、 Figure 11 and Figure 12 As shown, the chain-type operating device 3 with a cutter head is installed in the chain annular guide groove 1-1-1. The chain-type operating device 3 with a cutter head is spliced ​​together by multiple chain drive knife groups 3-1. The chain drive knife group 3-1 is composed of a rotary cutting chain 3-1-1, a mud breaking knife head 3-1-2 and a chain knife long bolt 3-1-3. Two chain bolt holes 3-1-1-1 are reserved on each section of the rotary cutting chain 3-1-1, and two knife head bolt holes 3-1-2-1 are reserved on each mud breaking knife head 3-1-2. They are combined into a chain drive knife group 3-1 through two chain knife long bolts 3-1-3.

[0059] In this embodiment, each section of the rotary cutting chain 3-1-1 is connected to a mud breaking cutter head 3-1-2, and the mud breaking cutter head 3-1-2 protrudes 3 cm from the outer wall of the rectangular steel top pipe section 1. When the chain-type operating device 3 with a cutter head is in operation, the mud breaking cutter head 3-1-2 can not only cut the soil to form a good gap of 2 cm to 3 cm thick between the pipe and the soil, but also give a certain throwing force to the mud ejected from the grouting hole, rotating it into the gap between the pipe and the soil, and bringing out the slurry at the accumulation point and replenishing it to the parts with thinner mud thickness, such as the top, bottom and side wall of the pipe section, so that the slurry forms a uniform and complete mud sleeve between the pipe and the soil.

[0060] like Figure 13 、 Figure 14 and Figure 15 As shown, the grouting pipe 4 consists of a main grouting pipe 4-1, upper and lower branch grouting pipes 4-2, left and right branch grouting pipes 4-3, a first slurry distributor 4-4 and a second slurry distributor 4-5. The upper and lower branch grouting pipes 4-2 and the left and right branch grouting pipes 4-3 are connected to form a closed-loop pipeline. A second slurry distributor 4-5 is provided at each grouting hole 1-1-3 to facilitate the circulation of slurry and the injection of slurry into the pipe-soil space; the first slurry distributor 4-4 is provided on both sides of the rear end of the rectangular steel top pipe section 1 to receive the injection of slurry and transport it to the next pipe section.

[0061] In this embodiment, the main grouting pipe 4-1 includes a main grouting inlet pipe 4-1-1 and a main grouting outlet pipe 4-1-2. The main grouting inlet pipe 4-1-1 is connected to the left and right branch grouting pipes 4-3 and the main grouting outlet pipe 4-1-2 through the first slurry distributor 4-4; the slurry is distributed to the main grouting outlet pipe 4-1-2 and the left and right branch grouting pipes 4-3.

[0062] In summary, the present invention provides a friction reduction device, pipe jacking system, and method for promoting uniform mud casing formation. Compared with existing devices, the present invention has the following advantages: The present invention effectively solves the technical problem of uneven mud distribution in rectangular pipe jacking construction through an innovative chain-type dynamic friction reduction device. This device adopts a design in which a chain with a cutter head rotates in a circle on the outer wall of the pipe segment, simultaneously achieving the dual functions of soil cutting and mud spinning. Through mechanical coercion, the mud is evenly distributed to areas such as the top plate and side walls that are difficult to cover with traditional processes. Cross steel ribs are set inside the device to enhance the structural strength, and specially designed anti-deflection ridges ensure stable chain operation. The modular chain drive knife group is easy to maintain and replace. The grouting system uses a closed-loop pipeline with a multi-directional distributor to achieve precise delivery of slurry to the chain movement trajectory. The steel pipe segment and the concrete pipe segment are connected by an optimized socket joint to form a rigid and flexible structural system. The entire system overcomes the problem of slurry accumulation caused by gravity through dynamic mechanical action, significantly improves the uniformity and stability of the mud sleeve, and reduces the jacking resistance. It is particularly suitable for large-section and long-distance pipe jacking projects, and has comprehensive advantages such as reliable structure, efficient construction, and convenient maintenance.

[0063] The above embodiment is only one of the implementation methods that can realize the technical solution of the present invention. The scope of protection claimed by the present invention is not limited only to this embodiment, but also includes changes, replacements and other implementation methods that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed by the present invention.

Claims

1. A friction reducing device for promoting uniform mud jacket formation, characterized in that: It includes a rectangular steel top pipe section (1); A chain annular guide groove (1-1-1) is provided on the outer wall of one end of the rectangular steel top pipe section (1); A chain-type operating device (3) with a cutter head and capable of rotating along the chain annular guide groove (1-1-1) is provided in the chain annular guide groove (1-1-1); A motor gear driver (2) is provided on the inner wall of the rectangular steel top pipe section (1); The motor gear driver (2) is connected to the chain-type operating device with a cutter head (3); The motor gear driver (2) can drive the cutter head chain type operating device (3) to rotate, cutting the soil to form a pipe-soil gap; A grouting pipe (4) is inserted into the rectangular steel top pipe section (1); the injection direction of the grouting pipe (4) is set toward the motion trajectory of the chain-type operating device with a cutter head (3), so that the ejected mud is rotated by the chain-type operating device with a cutter head (3) to the gap between the pipe and the soil.

2. A friction reducing device for promoting uniform mud jacket formation according to claim 1, characterized in that: The inner wall of the rectangular steel top pipe section (1) is provided with multiple groups of cross steel ribs (1-1-2); The cross steel ribs (1-1-2) include a plurality of longitudinal steel ribs (1-1-2-1) and a plurality of transverse steel ribs (1-1-2-2); The longitudinal steel ribs (1-1-2-1) are evenly arranged along the jacking direction; The transverse steel rib (1-1-2-2) is arranged perpendicular to the jacking direction and is located at the projection of the chain annular guide groove (1-1-1) to the rectangular steel jacking pipe section (1).

3. A friction reducing device for promoting uniform mud jacket formation according to claim 1, characterized in that: Chain anti-deflection ridges (1-1-1-2) are respectively provided at both ends of the bottom of the chain annular guide groove (1-1-1); the chain-type operating device with a cutter head (3) is provided between the two chain anti-deflection ridges (1-1-1-2) and is used to limit the position of the chain-type operating device with a cutter head (3); The cross section of the chain anti-deflection rib (1-1-1-2) is a right-angled triangle with concave curved sides, and the concave curved sides of the chain anti-deflection rib (1-1-1-2) are recessed toward both sides of the chain annular guide groove 1-1-1.

4. A friction reducing device for promoting uniform mud jacket formation according to claim 1, characterized in that: The motor gear driver (2) comprises a drive motor (2-1), a transmission gear (2-2), a speed regulating gear box (2-3) and a fixed seat plate (2-4); The driving motor (2-1) is mounted on the inner wall of the rectangular steel top pipe section (1) via the fixed seat plate (2-4); The driving motor (2-1) is connected to the speed regulating gear box (2-3) to achieve speed ratio adjustment; the output end of the driving motor (2-1) is connected to the transmission gear (2-2); The tooth end of the transmission gear (2-2) is arranged to protrude from the surface of the chain annular guide groove (1-1-1) and is meshed and connected with the chain-type operating device with a cutter head (3).

5. A friction reducing device for promoting uniform mud jacket formation according to claim 1, characterized in that: The chain-type operating device with a cutter head (3) comprises a plurality of chain-driven cutter groups (3-1) connected in sequence; The chain drive knife group (3-1) comprises a rotary cutting chain (3-1-1), a mud breaking knife head (3-1-2) and a chain knife long bolt (3-1-3); The peeling chain (3-1-1) is connected to the output end of the motor gear driver (2); The peeling chain (3-1-1) is provided with a chain bolt hole (3-1-1-1), and the connection between two adjacent chain drive knife groups (3-1) is achieved through the chain bolt hole (3-1-1-1); A cutter head bolt hole (3-1-2-1) is also provided on the top of the rotary cutting chain (3-1-1); the mud breaking cutter head (3-1-2) is connected to the rotary cutting chain (3-1-1) via the cutter head bolt hole (3-1-2-1) and the chain cutter long bolt (3-1-3).

6. A friction reducing device for promoting uniform mud jacket formation according to claim 1, characterized in that: The grouting pipe (4) comprises a main grouting pipe (4-1), upper and lower branch grouting pipes (4-2), left and right branch grouting pipes (4-3), a first slurry distributor (4-4), and a second slurry distributor (4-5); The main grouting pipe (4-1) comprises a main grouting inlet pipe (4-1-1) and a main grouting outlet pipe (4-1-2); The main grouting inlet pipe (4-1-1) is respectively connected to the left and right branch grouting pipes (4-3) and the main grouting outlet pipe (4-1-2) through a first slurry distributor (4-4); The left and right branch grouting pipes (4-3) are connected to the upper and lower branch grouting pipes (4-2) to form a closed-loop pipeline; The upper and lower branch grouting pipes (4-2) are in communication with the second slurry distributor (4-5); A plurality of grouting holes (1-1-3) are provided around the chain annular guide groove (1-1-1); The second slurry distributor (4-5) is correspondingly arranged at the grouting hole (1-1-3) and is connected to the grouting hole (1-1-3). The injection direction of the grouting hole (1-1-3) is arranged toward the movement trajectory of the chain-type operating device with a cutter head (3).

7. A friction reducing device for promoting uniform mud jacket formation according to claim 1, characterized in that: One end of the rectangular steel jacking pipe section (1) is connected to the first concrete pipe section (5) or the head of the jacking machine via a bent bolt (7), and the other end is connected to the second concrete pipe section (6) via a bent bolt (7).

8. A friction reducing device for promoting uniform mud jacket formation according to claim 7, characterized in that: One end of the rectangular steel top pipe section (1) is provided with a front socket joint (1-2), and the other end is provided with a rear socket joint (1-3); the cross section of the front socket joint (1-2) is hawk-beak shaped.

9. A method for operating a friction reducing device for promoting uniform mud jacket formation, characterized in that: The friction reducing device for promoting uniform mud jacket formation according to any one of claims 1 to 8 comprises: Starting the motor gear driver (2) to drive the chain annular guide groove (1-1-1) of the cutter head chain operating device (3) to rotate; During the rotation of the cutter head chain type operating device (3), the soil is cut to form a gap between the pipe and the soil, and at the same time, the slurry ejected from the grouting pipe (4) is spun into the gap between the pipe and the soil.

10. A rectangular pipe jacking system, characterized in that: comprising the friction reducing device for promoting uniform mud jacket formation according to any one of claims 1 to 8; One end of the friction reduction device for promoting the formation of a uniform mud jacket is connected to the first concrete pipe section (5) or the head of the pipe jacking machine, and the other end is connected to the second concrete pipe section (6).

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