A subway tunnel synchronous grouting flow control device

Abstract

The utility model belongs to the field of tunnel construction technology, and specifically is a subway tunnel synchronous grouting flow control device, it is inside wall with internal component between grouting pipeline, which is the main passage of fluid, and is limited to the annular space for grout liquid circulation, sealing transmission assembly, it is coaxial with grouting pipeline Setting, through setting sealing transmission assembly, planet gear reduction mechanism is encapsulated in the streamline sealing shell full of lubricating oil, solves the problem that traditional mechanical device directly contacts grout liquid and is easy to wear and jam, utilizes the speed reduction and torque increasing characteristics of planet gear, can convert the weak impact force of fluid into the powerful rotary cutting force of scraper cage, ensures that even when the harder cement stone is formed on the surface of elastomer, the scraper still has enough torque to scrape it, prevents the mechanism from stopping due to excessive resistance.

Description

Technical Field

[0001] This utility model belongs to the field of tunnel construction technology, specifically a synchronous grouting flow control device for subway tunnels. Background Technology

[0002] Synchronous grouting in subway tunnels is a key supporting process in shield tunneling. Specifically, it refers to the timely injection of grout with specific properties into the annular gap formed between the outer side of the tunnel segment and the excavated surrounding rock through pre-set grouting channels as the tunnel boring machine advances and the tunnel segments are assembled and positioned ring by ring. The core function is to quickly fill the gap, effectively inhibit ground deformation and surface settlement, and prevent damage to surrounding buildings and underground pipelines due to soil disturbance. After the injected grout solidifies, it can form an integral structure with the tunnel segments and surrounding rock, providing early circumferential support for the tunnel segments, enhancing the stability and impermeability of the tunnel, and ensuring the safety and quality of subway tunnel construction.

[0003] Existing technologies for grouting flow control typically rely on manual ball valves or simple orifice plates. However, due to the large amount of solid particles in the grout and its rapid setting characteristics, scale will accumulate between the valve core and valve seat, causing the valve to jam and become unadjustable, or even causing complete blockage of the pipeline, which seriously affects the construction progress. The grouting pressure of the shield tunnel is greatly affected by the geological conditions and fluctuates greatly. Fixed-opening valves cannot automatically compensate for the flow according to pressure changes, resulting in uneven grouting volume distribution and affecting the quality of ring formation. Moreover, existing pipeline cleaning devices usually require manual disassembly or high-pressure water flushing after shutdown, lacking online automatic cleaning capabilities, resulting in high maintenance costs and low efficiency. Utility Model Content

[0004] To address the shortcomings of existing technologies and solve the problems of scale buildup between the valve core and seat, which can cause valve jamming and inability to adjust, or even complete pipeline blockage, severely impacting construction progress, and the significant fluctuations in shield tunnel grouting pressure due to geological conditions, fixed-opening valves cannot automatically compensate for flow rate changes, resulting in uneven grouting volume distribution and affecting the quality of ring formation, this utility model proposes a synchronous grouting flow control device for subway tunnels.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a synchronous grouting flow control device for subway tunnels, comprising:

[0006] Grouting pipes, as the main channel for fluid, define an annular space for the flow of grout between their inner walls and internal components;

[0007] A sealing transmission assembly is coaxially arranged with the grouting pipe. The sealing transmission assembly includes a sealing housing fixed at the axis of the grouting pipe, and an input shaft and an output shaft passing through both ends of the sealing housing.

[0008] A reduction assembly, which is coaxially arranged with the sealing transmission assembly, includes an impeller located upstream of the outside of the sealing housing and connected to the input shaft, and a gear reduction mechanism located inside the sealing housing and connected to the input shaft and the output shaft;

[0009] The self-cleaning component, located downstream of the sealing transmission component, includes a scraper cage connected to and rotating with the output shaft, and an elastic body coaxially placed inside the scraper cage and remaining stationary.

[0010] When the grout flows through the grouting pipe, the grout drives the impeller to rotate. After the gear reduction mechanism reduces the speed and increases the torque, it drives the scraper cage to rotate and scrape around the elastic body.

[0011] Preferably, the sealing shell is suspended and fixed to the inner wall of the grouting pipe by a number of radially distributed support ribs. The number of support ribs is three to four and they are evenly distributed along the circumference. The interior of the sealing shell forms a closed lubricating oil cavity, which is filled with lubricating oil. The connection between the input shaft and the output shaft and the sealing shell is provided with a dynamic sealing structure.

[0012] Preferably, the reduction assembly further includes a sun gear connected to the inner end of the input shaft, an internal gear ring fixedly disposed on the inner wall of the sealing housing, a planet carrier fixedly connected to the output shaft, and a plurality of planet gears rotatably mounted on the planet carrier, the planet gears meshing with both the sun gear and the internal gear ring.

[0013] Preferably, the upstream end of the sealed housing is provided with a hemispherical flow guide shroud, which is made of wear-resistant stainless steel. The impeller adopts a turbine blade design, and the blade surface is coated with a tungsten carbide wear-resistant coating.

[0014] Preferably, the scraper cage has a hollow cage-like structure, and the inner side of the scraper cage skeleton is provided with a number of protruding scraping teeth. The scraping teeth are distributed along the spiral or axial direction of the scraper cage. The scraping teeth are made of hard alloy. The scraping teeth are in close contact with the outer surface of the elastomer and are used to peel off the slurry layer attached to the surface of the elastomer.

[0015] Preferably, a tripod is fixedly provided at the grout outlet of the grouting pipe. The tripod supports the tail of the elastic body by an axially extending positioning rod, so that it remains in a non-rotating state. The material of the elastic body is wear-resistant polyurethane.

[0016] Preferably, the elastic body is provided with a return spring inside, the preload of the return spring is adjustable, and the elastic body is configured to undergo axial compression or radial deformation according to the change of grouting pressure, thereby changing the flow area between the elastic body and the inner wall of the grouting pipe; when the pressure increases, the elastic body is compressed and deformed, causing the flow area to decrease, and when the pressure decreases, it returns to its original position.

[0017] The beneficial effects of this utility model are as follows:

[0018] 1. The synchronous grouting flow control device for subway tunnels described in this utility model, by setting a sealed transmission component, encapsulates the planetary gear reduction mechanism in a streamlined sealed shell filled with lubricating oil, completely isolating it from the external grout containing sand and corrosive chemical components. This solves the problem of traditional mechanical devices being prone to wear and jamming when directly in contact with grout. Utilizing the reduction and torque-increasing characteristics of planetary gears, the weak impact force of the fluid can be converted into a powerful rotating cutting force of the scraper cage, ensuring that even when a hard cement aggregate forms on the surface of the elastomer, the scraper still has sufficient torque to scrape it off, preventing the mechanism from stopping due to excessive resistance.

[0019] 2. The synchronous grouting flow control device for subway tunnels described in this utility model, through the use of an elastic body and a reset spring, can adaptively respond to and compensate for grouting pulsation pressure, ensuring the uniformity of grouting volume behind the wall. With the real-time scraping function of the self-cleaning component, the device can always maintain the smoothness of the surface of the adjusting component (elastic body), avoiding adjustment failure caused by scaling, reducing the number of downtime cleaning caused by pipeline blockage during shield tunneling, and improving tunnel construction efficiency and grouting quality. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] Figure 1 This is a three-dimensional schematic diagram of the overall structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the impeller structure of this utility model;

[0023] Figure 3 This is a schematic diagram of the internal structure of the sealed outer shell of this utility model;

[0024] Figure 4 This is a schematic diagram of the planetary carrier and output shaft of this utility model;

[0025] Figure 5 This is a schematic diagram of the scraper cage and elastomer structure of this utility model;

[0026] Figure 6 This is a schematic diagram of the internal structure of the elastomer of this utility model;

[0027] Figure 7 This is a schematic diagram of the tripod structure of this utility model.

[0028] In the picture:

[0029] 100. Grouting pipes;

[0030] 200. Sealed transmission assembly; 210. Sealed housing; 211. Flow guide and rectifier; 213. Support rib; 214. Lubricating oil chamber; 220. Input shaft; 230. Output shaft;

[0031] 300. Reduction gear assembly; 310. Impeller; 320. Planetary carrier; 321. Sun gear; 322. Internal gear ring; 323. Planetary gears;

[0032] 400. Self-cleaning component; 410. Elastomer; 411. Return spring; 420. Scraper cage; 421. Scraper teeth; 430. Tripod; 431. Positioning rod. Detailed Implementation

[0033] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0034] like Figure 1 As shown, this embodiment discloses a synchronous grouting flow control device for subway tunnels, including: a grouting pipe 100, a sealing transmission assembly 200, a deceleration assembly 300, and a self-cleaning assembly 400; the sealing transmission assembly 200, the deceleration assembly 300, and the self-cleaning assembly 400 are coaxially arranged inside the grouting pipe 100; the grouting pipe 100 serves as the main channel for fluid, and its inner wall and the internal components define an annular space for the flow of grout; flanges or quick connectors are provided at both ends of the grouting pipe 100 to facilitate series installation in the pipeline of the tunnel boring machine grouting system.

[0035] Furthermore, in existing technologies for synchronous grouting in subway tunnels, the grouting flow control typically relies on manual ball valves or simple orifice plates. Traditional valve cores and seats accumulate scale, causing valves to jam and become unadjustable, or even completely blocking the pipeline. The shield grouting pressure fluctuates greatly due to geological conditions, and fixed-opening valves cannot automatically compensate for flow changes based on pressure variations, resulting in uneven grouting volume distribution and affecting the quality of ring formation. Moreover, existing pipeline cleaning devices usually require manual disassembly or high-pressure water flushing after shutdown, lacking online automatic cleaning capabilities.

[0036] During operation, when the high-pressure slurry flows through the grouting pipe 100, it impacts the upstream impeller 310, driving it to rotate at high speed. This rotational power is transmitted through the input shaft 220 to the reduction gear 300 inside the sealed housing 210. The high-speed rotation of the sun gear 321 in the lubricating oil chamber 214 drives the planetary gears 323 to revolve around the fixed internal gear ring 322. Through the planetary gear transmission principle, the high-speed, low-torque input of the impeller 310 is converted into the low-speed, high-torque output of the planetary carrier 320 and the output shaft 230. The output shaft 230 drives the downstream scraper cage 42. The low-speed rotation causes the scraper teeth 421 to circumferentially scrape the surface of the stationary elastomer 410, physically peeling off the slurry clumps adhering to the surface of the elastomer 410 in real time. At this time, the elastomer 410 works under the action of slurry pressure. When the grouting pressure suddenly increases, the elastomer 410 is compressed or radially contracted to overcome the resistance of the return spring 411, resulting in a reduction of the flow area between it and the pipe wall, thereby suppressing the flow rate. When the pressure decreases, the elastomer 410 returns to its original position, the flow area increases, and the flow rate remains constant. The mechanical self-cleaning and flow adaptive regulation are realized simultaneously by utilizing the fluid's own energy.

[0037] like Figure 1 and Figure 3 As shown, the sealing transmission assembly 200 is located at the mid-section axis of the grouting pipe 100, and includes a sealing shell 210. This sealing shell 210 is suspended and fixed to the inner wall of the grouting pipe 100 by several radially distributed support ribs 213, numbering three to four and evenly distributed along the circumference, to minimize disturbance to the fluid while providing stable support. To reduce the resistance to grout flow, a hemispherical flow guide shroud 211 is provided at the upstream end (water-facing end) of the sealing shell 210. This flow guide shroud 211 is made of wear-resistant stainless steel and can effectively disperse the frontal impact force of the high-pressure grout. The interior of the sealing housing 210 forms a closed cavity, namely the lubricating oil cavity 214, which is used to accommodate the mechanical transmission components and fill them with lubricating oil to achieve complete isolation from the external slurry. The lubricating oil serves to lubricate the gears, balance some of the external pressure, and conduct the heat generated by the gear operation to the housing for dissipation. The sealing transmission assembly 200 also includes a rotating shaft passing through both ends of the sealing housing 210, an input shaft 220 located at the upstream end and an output shaft 230 located at the downstream end. The connection between the input shaft 220 and the output shaft 230 and the sealing housing 210 is provided with a dynamic sealing structure to prevent slurry from seeping into the lubricating oil cavity 214.

[0038] like Figure 2 and Figure 3As shown, the reduction assembly 300 mainly consists of an external power source and an internal gear set. An impeller 310 is located upstream of the outer side of the sealing housing 210. The impeller 310 is fixedly installed at the end of the input shaft 220, directly facing the impact of the grouting slurry. The impeller 310 adopts a spiral propulsion or turbine blade design, and the blade surface is coated with a tungsten carbide wear-resistant coating to resist the erosion and wear of the mortar. Inside the sealing housing 210 (i.e., inside the lubricating oil chamber 214), a miniature planetary gear reduction mechanism is provided. A sun gear 321 is connected to the inner end of the input shaft 220, and an internal gear ring 322 is fixedly installed on the inner wall of the sealing housing 210. A number of planetary gears 323 mesh with the internal gear ring 322. The planetary gears 323 are rotatably mounted on the planetary carrier 320, which is fixedly connected to the output shaft 230. The high-speed rotation of the impeller 310 is input through the sun gear 321, driving the planetary gears 323 to revolve around the internal gear ring 322. Finally, the power after deceleration and torque increase is transmitted to the output shaft 230 through the planetary carrier 320. Thus, the high-speed, low-torque kinetic energy generated by the impeller 310 under fluid drive is converted into low-speed, high-torque kinetic energy of the output shaft 230, thereby ensuring that the subsequent scraper mechanism has enough power to scrape off the hardened cement stone and prevent jamming due to excessive resistance.

[0039] like Figure 1 and Figure 5 As shown, the self-cleaning component 400 is located downstream of the sealing transmission component 200 and includes a scraper cage 420 that can rotate with the output shaft 230 and a stationary elastomer 410. The scraper cage 420 has a hollow cage-like structure that allows the slurry to freely pass through the cage and contact the internal components. One end of the scraper cage 420 is fixedly connected to the output shaft 230. The inner side of the scraper cage 420 has several protruding scraper teeth 421, which are distributed along a spiral or axial direction and are made of hard alloy. The elastomer 410 (e.g., a rubber cone) is coaxially placed inside the scraper cage 420 and is made of wear-resistant polyurethane, which has good resilience and corrosion resistance. To maintain the stability of the elastomer 410 under fluid impact, such as... Figure 1 and Figure 7 A tripod 430 is fixedly installed at the grout outlet of the grouting pipe 100. The tripod 430 supports the tail of the elastic body 410 through an axially extending positioning rod 431, keeping it in a non-rotating state. Figure 6As shown, a return spring 411 is provided inside or behind the elastomer 410. The preload of the return spring 411 is adjustable and is used to set the initial opening pressure, so that the elastomer 410 can undergo axial compression or radial deformation according to the change of grouting pressure, thereby changing the flow area between the elastomer 410 and the inner wall of the grouting pipe 100. When the pressure increases, the elastomer 410 is compressed and deformed, which reduces the flow area and thus limits the surge in flow. Conversely, it resets. During this process, the scraper teeth 421 are in close contact or slightly interference fit with the outer surface of the elastomer 410. The rotating scraper teeth 421 use their high torque to continuously peel off the grout layer attached to the surface of the elastomer 410, ensuring that the elastomer 410 always maintains sensitive deformation ability and avoids the elastomer 410 from failing due to hardening of surface scale.

[0040] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A synchronous grouting flow control device for subway tunnels, characterized in that, include: Grouting pipe (100), as the main channel for fluid, defines an annular space for grout flow between its inner wall and internal components; A sealing drive assembly (200) is coaxially arranged with the grouting pipe (100). The sealing drive assembly (200) includes a sealing housing (210) fixed at the axis of the grouting pipe (100), and an input shaft (220) and an output shaft (230) passing through both ends of the sealing housing (210). A reduction assembly (300) is coaxially arranged with a sealing transmission assembly (200). The reduction assembly (300) includes an impeller (310) located upstream of the sealing housing (210) and connected to the input shaft (220), and a gear reduction mechanism located inside the sealing housing (210) and connected to the input shaft (220) and the output shaft (230). The self-cleaning assembly (400), located downstream of the sealing transmission assembly (200), includes a scraper cage (420) connected to and rotating with the output shaft (230), and an elastomer (410) coaxially placed inside the scraper cage (420) and remaining stationary. When the grout flows through the grouting pipe (100), the grout drives the impeller (310) to rotate. After the gear reduction mechanism reduces the speed and increases the torque, it drives the scraper cage (420) to rotate and scrape around the elastic body (410).

2. The subway tunnel synchronous grouting flow control device according to claim 1, characterized in that, The sealing shell (210) is suspended and fixed to the inner wall of the grouting pipe (100) by a number of radially distributed support ribs (213). The number of support ribs (213) is three to four and they are evenly distributed along the circumference. The interior of the sealing shell (210) forms a closed lubricating oil cavity (214), which is filled with lubricating oil. The connection between the input shaft (220) and the output shaft (230) and the sealing shell (210) is provided with a dynamic sealing structure.

3. The subway tunnel synchronous grouting flow control device according to claim 2, characterized in that, The reduction assembly (300) also includes a sun gear (321), which is connected to the inner end of the input shaft (220). An internal gear ring (322) is fixedly provided on the inner wall of the sealing housing (210). A planet carrier (320) is fixedly connected to the output shaft (230). A plurality of planet gears (323) are rotatably mounted on the planet carrier (320). The planet gears (323) mesh with both the sun gear (321) and the internal gear ring (322).

4. The synchronous grouting flow control device for subway tunnels according to claim 2, characterized in that, The upstream end of the sealed housing (210) is provided with a hemispherical flow guide shroud (211), which is made of wear-resistant stainless steel, and the impeller (310) adopts a turbine blade design.

5. The synchronous grouting flow control device for subway tunnels according to claim 1, characterized in that, The scraper cage (420) has a hollow cage-like structure. The inner side of the scraper cage (420) is provided with several protruding scraper teeth (421). The scraper teeth (421) are distributed along the spiral or axial direction of the scraper cage (420). The scraper teeth (421) are made of hard alloy. The scraper teeth (421) are in close contact with the outer surface of the elastomer (410) and are used to peel off the slurry layer attached to the surface of the elastomer (410).

6. The synchronous grouting flow control device for subway tunnels according to claim 1, characterized in that, A tripod (430) is fixedly installed at the grout outlet of the grouting pipe (100). The tripod (430) supports the tail of the elastic body (410) through an axially extending positioning rod (431) to keep it in a non-rotating state.

7. The synchronous grouting flow control device for subway tunnels according to claim 6, characterized in that, The elastic body (410) is provided with a return spring (411) inside. The preload of the return spring (411) is adjustable. The elastic body (410) is configured to undergo axial compression or radial deformation according to the change of grouting pressure, thereby changing the flow area between the elastic body (410) and the inner wall of the grouting pipe (100). When the pressure increases, the elastic body (410) is compressed and deformed, causing the flow area to decrease. When the pressure decreases, it returns to its original position.

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