Roadheader synchronous grouting system test device

Abstract

The application relates to a tunneling machine synchronous grouting system test device, and belongs to the field of tunnel construction. The tunneling machine synchronous grouting system test device comprises an outer shell, an inner shell, a driving assembly and two groups of sealing assemblies. The inner shell is arranged in the outer shell and is parallel to the outer shell. A gap exists between the outer shell and the inner shell. A grouting space is surrounded by the outer shell, the inner shell and the two groups of sealing assemblies. The driving assembly is used for driving the inner shell to move in a direction parallel to the outer shell. A grouting port in communication with the grouting space is arranged on the inner shell. A control port in communication with the grouting space is arranged on the outer shell. The application realizes dynamic simulation of the synchronous grouting process in the shield propulsion process of the shield machine, can realize synchronous grouting simulation test under multiple working conditions, and has an important guiding role for the actual shield construction process.

Description

Technical Field

[0001] This application relates to the field of tunnel construction, and in particular to a test device for a synchronous grouting system for a tunnel boring machine. Background Technology

[0002] In the construction of underground tunnels using the tunnel boring machine (TBM) method, the TBM head is driven by hydraulic cylinders to excavate into the soil layer ahead, while simultaneously, pre-formed tunnel segments are used to line the tunnel at the rear of the TBM. As the TBM advances, the tail of the shield moves forward simultaneously, leaving a construction gap between the soil and the tunnel segment lining. To effectively control the deformation of the surrounding soil and ground settlement, and to ensure the stability of the tunnel, grout is injected synchronously and evenly into the tunnel segment wall at a predetermined pressure and volume. To prevent the grout from entering the shield body, a tail brush is welded to the tail of the shield for sealing. The grout completely fills the construction gap created behind the tail of the shield as the TBM advances, which is called synchronous grouting. Synchronous grouting technology plays a crucial role in controlling surface settlement, reducing disturbance to surrounding underground structures, and maintaining the stability of shield tunnel construction. The effectiveness of grouting directly determines the deformation of the strata.

[0003] Synchronous grouting should be timely, uniform, and sufficient. The quality of synchronous grouting is affected by many factors such as grout ratio, advance speed, and grout flow rate. How to adopt appropriate process parameters to achieve the best synchronous grouting effect is an important issue in the field of tunnel shield construction technology.

[0004] In existing technologies, in order to control the influence of grout mix ratio on the synchronous grouting effect and thus achieve a better synchronous grouting effect, known geological conditions are usually statistically analyzed and a geological survey report is prepared. Subsequently, the geological conditions of the tunnel to be excavated are simulated in the laboratory. By injecting grout with different mix ratios, the effects after grouting are observed and corresponding improvements are made. In this way, an ideal grout formula is obtained, which guides the actual construction operation.

[0005] However, existing synchronous grouting test devices can only simulate single working conditions based on data presented in geological survey reports. Due to limitations such as tunnel depth, economic costs, or geological survey equipment conditions, detailed investigations are difficult for some tunnels, and the geological conditions revealed in geological survey reports are limited. In actual work, geological abrupt changes are inevitable during tunnel excavation, especially when excavating tunnels with abundant groundwater or fractured rock strata. Therefore, simulating potential adverse geological conditions in advance and preparing corresponding emergency measures, so as to take targeted measures at the first sign of an abrupt change, avoids situations of insufficient preparation or inadequate measures, and has important guiding significance for actual construction. Summary of the Invention

[0006] In order to improve the problems existing in the above-mentioned technology, this application provides a test device for a synchronous grouting system for a tunneling machine.

[0007] The test device for a synchronous grouting system of a tunneling machine provided in this application adopts the following technical solution: A test device for a synchronous grouting system of a tunneling machine includes an outer shell, an inner shell, a drive assembly, and two sets of sealing assemblies. The inner shell is disposed inside the outer shell and parallel to the outer shell, with a gap between the outer shell and the inner shell. A grouting space is formed between the outer shell, the inner shell, and the two sets of sealing assemblies. The drive assembly is used to drive the inner shell to move in a direction parallel to the outer shell. The inner shell has a grouting port communicating with the grouting space, and the outer shell has a control port communicating with the grouting space.

[0008] By adopting the above technical solution, the tunnel lining is completed during the advance of the shield tail. The tunnel segments move relative to the tunnel, and the advance of the shield tail provides the power source for the movement of the tunnel segments. The outer shell simulates the tunnel, and the inner shell simulates the tunnel segments. The drive component drives the inner shell to translate within the outer shell. During this process, the outer shell is fixed, and relative movement occurs between the inner shell and the outer shell, thus simulating the movement between the tunnel and the tunnel segments. During the movement of the inner shell, grout is injected into the grouting space through the grouting port, thus simulating the synchronous grouting process. The sealing component is used to seal the grouting space to prevent backflow of grout during the grouting process and to ensure the grouting pressure within the grouting space. After the injected grout solidifies, the outer shell can be removed, allowing observation of the grout solidification. The setting of the control port enables the device to realize synchronous grouting simulation tests under multiple working conditions, such as when there is no soil in the grouting space. When added, the synchronous grouting process in the fixed building gap can be simulated. When soil is filled into the grouting space through the control port, the synchronous grouting process of the tunnel boring machine in the soil can be simulated. After grouting is completed, the consolidation of grout and soil can be observed. If it is necessary to simulate sudden geological conditions during synchronous grouting, water or rock can be injected into the control port during synchronous grouting to simulate situations such as sudden groundwater gushing or rock fracturing during shield tunneling. Furthermore, by controlling the propulsion speed of the drive components and the speed and flow rate of grout injected into the grouting port, the influence of different propulsion speeds and grout flow rates on the synchronous grouting effect can be studied. Through the above settings, the dynamic simulation of the synchronous grouting process during shield tunneling is realized, and synchronous grouting simulation tests under multiple working conditions can be carried out, which has important guiding significance for the actual shield tunneling construction process.

[0009] Optionally, multiple control ports are distributed on the housing.

[0010] By adopting the above technical solution, the control port is used to simulate sudden geological conditions, and by setting multiple control ports, different geological conditions can be simulated in combination.

[0011] Optionally, the drive assembly includes a plurality of translation cylinders, the movable ends of which are parallel to the inner shell and connected to the inner sidewall of the inner shell.

[0012] By adopting the above technical solution, the actual tunneling process of the shield machine is driven by hydraulic cylinders. Therefore, by moving the inner shell by translating the hydraulic cylinders, the movement between the actual tunnel and the segments can be reproduced, thus improving the accuracy of the test. By moving the inner shell by multiple hydraulic cylinders at the same time, it is beneficial to ensure the stability of the inner shell during the movement process.

[0013] Optionally, each of the sealing assemblies includes a set of tail brushes, one set of tail brushes being disposed on the outer shell and the other set of tail brushes being disposed on the inner shell.

[0014] By adopting the above technical solution, the tail brush is used for sealing during the actual tunneling process of the tunnel boring machine to prevent grout leakage. Therefore, the tail brush restores the sealing state of the grouting space and improves the accuracy of the test. At the same time, it can also test whether different grouting pressure or flow rate and other parameters will affect the sealing of the tail brush, that is, to study whether different parameters in synchronous grouting will affect the sealing at the tail of the tunnel boring machine.

[0015] Optionally, the shield tail brush disposed on the outer shell is detachably connected to the outer shell, and the shield tail brush disposed on the inner shell is detachably connected to the inner shell.

[0016] By adopting the above technical solution, the tail brush mainly seals the grouting space and prevents the grout from flowing back during the grouting process. By detachably connecting the tail brush to the outer shell and the inner shell, it is convenient to adjust the number of tail brushes according to different grouting pressures. It can also determine the number of tail brushes required during the tunnel boring machine excavation under the grouting pressure or flow rate parameters.

[0017] Optionally, both the outer sidewall of the inner shell and the inner sidewall of the outer shell are coated with resin.

[0018] By adopting the above technical solution, it is easy to separate the outer shell, the solidified slurry, and the inner shell after the slurry solidifies, thereby facilitating the observation of the solidified slurry.

[0019] Optionally, multiple grouting ports are distributed on the inner shell.

[0020] By adopting the above technical solution, the uniformity of grout in the grouting space can be improved by simultaneously injecting grout into multiple grouting ports; and different grouting methods can be achieved by injecting grout into different grouting ports.

[0021] Optionally, the outer casing is made of transparent acrylic glass.

[0022] By adopting the above technical solution, it is convenient to monitor the grouting situation in real time during the grouting process.

[0023] In summary, this application includes at least one of the following beneficial technical effects: 1. By setting up the control port, the device can realize synchronous grouting simulation tests under multiple working conditions. When no soil is added to the grouting space, it can simulate the synchronous grouting process in a fixed building gap. When soil is filled into the grouting space through the control port, it can simulate the synchronous grouting process of the tunnel boring machine in the soil. After grouting, the consolidation of grout and soil can be observed. If it is necessary to simulate sudden geological conditions during synchronous grouting, water or rocks can be injected into the control port during synchronous grouting, thereby simulating situations such as sudden groundwater gushing or rock fracturing during shield tunneling. Furthermore, by controlling the propulsion speed of the drive components and the speed and flow rate of grout injected into the grouting port, the influence of different propulsion speeds and grout flow rates on the synchronous grouting effect can be studied. Through the above settings, dynamic simulation of the synchronous grouting process during shield tunneling is realized, and synchronous grouting simulation tests under multiple working conditions can be carried out, which has important guiding significance for the actual shield tunneling construction process. 2. The tail brush mainly seals the grouting space and prevents the grout from flowing back during the grouting process. By detachably connecting the tail brush to the outer shell and inner shell, it is easy to adjust the number of tail brushes according to different grouting pressures. It can also determine the number of tail brushes required during the tunnel boring machine operation under the given grouting pressure or flow rate parameters. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of a test device for a synchronous grouting system of a tunneling machine in an embodiment of this application.

[0025] Explanation of reference numerals in the attached drawings: 1. Outer shell; 2. Inner shell; 3. Drive assembly; 31. Translation cylinder; 4. Sealing assembly; 41. Shield tail brush; 5. Grouting space; 6. Grouting port; 7. Control port; 8. Control pipe. Detailed Implementation

[0026] The following is in conjunction with the appendix Figure 1 This application will be described in further detail.

[0027] This application discloses a test device for a synchronous grouting system of a tunneling machine. (Refer to...) Figure 1The test device for the synchronous grouting system of the tunnel boring machine includes an outer shell 1 and an inner shell 2. The outer shell 1 simulates a tunnel, and the inner shell 2 simulates a tunnel segment. The inner shell 2 is longer than the outer shell 1 and is arranged parallel to the outer shell 1 inside the outer shell 1. There is a gap between the outer shell 1 and the inner shell 2. A set of tail brushes 41 are bolted to the inner wall of the outer shell 1, and a set of tail brushes 41 are bolted to the outer wall of the inner shell 2. A grouting space 5 is formed between the two sets of tail brushes 41, the outer shell 1, and the inner shell 2.

[0028] The clearance between the outer shell 1 and the inner shell 2 can be determined according to the equipment of the actual project.

[0029] Reference Figure 1 Multiple translation cylinders 31 are installed on the inner wall of the inner shell 2. The multiple translation cylinders 31 are evenly distributed circumferentially on the inner wall of the inner shell 2. The movable ends of the multiple translation cylinders 31 are parallel to the inner shell 2 and connected to the inner wall of the inner shell 2. The movement of the movable ends of the translation cylinders 31 drives the inner shell 2 to translate within the outer shell 1. During this process, the outer shell 1 is fixed, and relative movement occurs between the inner shell 2 and the outer shell 1, thereby simulating the movement between the tunnel and the segments.

[0030] Reference Figure 1 The inner shell 2 has multiple grouting ports 6 that communicate with the grouting space 5. During the movement of the inner shell 2, grout is injected into the grouting space 5 through the grouting ports 6, thereby simulating the synchronous grouting process. Different grouting methods can also be achieved by injecting grout into different grouting ports 6.

[0031] Reference Figure 1 The outer shell 1 has multiple control ports 7 connected to the grouting space 5, and each control port 7 is fixedly connected to a control pipe 8. Through the setting of the control ports 7 and control pipes 8, the device can realize synchronous grouting simulation tests under multiple working conditions. When no soil is added in the grouting space 5, the synchronous grouting process in the fixed building gap can be simulated. When soil is filled into the grouting space 5 through the control pipe 8, the synchronous grouting process of the tunneling machine in the soil can be simulated. After the grouting is completed, the consolidation of the grout and the soil can be observed. If it is necessary to simulate sudden geological conditions during the synchronous grouting process, water or rocks can be injected into the control pipe 8 during the synchronous grouting process, thereby simulating situations such as sudden groundwater gushing or rock fracturing during the shield tunneling process. Multiple control ports 7 can be combined to simulate different geological conditions. When it is no longer necessary to use the control pipe 8 to simulate sudden geological conditions, the control pipe 8 can be closed.

[0032] In this embodiment, the tail brush 41 is detachably connected to the outer shell 1 and the inner shell 2 by bolts. The tail brush 41 mainly seals the grouting space 5 to prevent grout from flowing back during the grouting process. By connecting the tail brush 41 to the outer shell 1 and the inner shell 2 by bolts, it is convenient to adjust the number of tail brushes 41 according to different grouting pressures. It can also determine the number of tail brushes 41 required during the tunnel boring machine operation under the grouting pressure or flow rate parameters.

[0033] Reference Figure 1 Both the inner shell 2 and the outer shell 1 are made of transparent plexiglass, which facilitates real-time monitoring of the grouting process.

[0034] Reference Figure 1 The outer side wall of the inner shell 2 and the inner side wall of the outer shell 1 are both coated with resin; this facilitates the separation of the outer shell 1, the solidified slurry, and the inner shell 2 after the slurry solidifies, thereby making it easier to observe the condition after the slurry solidifies.

[0035] In this embodiment, both the inner shell 2 and the outer shell 1 are cylindrical. In other embodiments, the inner shell 2 and the outer shell 1 may be rectangular or irregular in shape. The specifications of the inner shell 2 and the outer shell 1 may be determined according to the equipment of the actual project.

[0036] The implementation principle of the synchronous grouting system test device for a tunnel boring machine according to this application embodiment is as follows: During the advance of the shield tail, the lining of the tunnel segments is completed. The tunnel segments move relative to the tunnel. The advance of the shield tail provides the power source for the movement of the tunnel segments. The outer shell 1 simulates the tunnel, and the inner shell 2 simulates the tunnel segments. The translation cylinder 31 drives the inner shell 2 to translate within the outer shell 1. During this process, the outer shell 1 is fixed, and relative movement occurs between the inner shell 2 and the outer shell 1, thereby simulating the movement between the tunnel and the tunnel segments. During the movement of the inner shell 2, grout is injected into the grouting space 5 through the grouting port 6, thereby simulating the synchronous grouting process. The shield tail brush 41 is used to seal the grouting space 5 to prevent backflow of grout during the grouting process and to ensure the grouting pressure within the grouting space 5. After the injected grout solidifies, the outer shell 1 can be removed to observe the solidification of the grout. The device can achieve simultaneous grouting under multiple working conditions through the setting of the control port 7 and the control pipe 8. The grouting simulation test can simulate the synchronous grouting process in a fixed building gap when no soil is added to the grouting space 5. When soil is filled into the grouting space 5 through the control pipe 8, the synchronous grouting process of the tunnel boring machine in the soil can be simulated. After grouting is completed, the consolidation of the grout and soil can be observed. If it is necessary to simulate sudden geological conditions during the synchronous grouting process, water or rocks can be injected into the control pipe 8 during the synchronous grouting process, thereby simulating the situation of encountering groundwater gushing or rock fracturing during the shield tunneling process. Furthermore, by controlling the propulsion speed of the drive component 3 and the speed and flow rate of grout injected into the grouting port 6, the influence of different propulsion speeds and grouting flow rates on the synchronous grouting effect can be studied. Through the above settings, the dynamic simulation of the synchronous grouting process during the shield tunneling process is realized, and synchronous grouting simulation tests under multiple working conditions can be carried out, which has important guiding significance for the actual shield tunneling construction process.

[0037] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A test device for a synchronous grouting system of a tunneling machine, characterized in that: The device includes an outer shell (1), an inner shell (2), a drive assembly (3), and two sets of sealing assemblies (4). The inner shell (2) is disposed inside the outer shell (1) and parallel to the outer shell (1). There is a gap between the outer shell (1) and the inner shell (2). A grouting space (5) is formed between the outer shell (1), the inner shell (2), and the two sets of sealing assemblies (4). The drive assembly (3) is used to drive the inner shell (2) to move in a direction parallel to the outer shell (1). The inner shell (2) has a grouting port (6) communicating with the grouting space (5). The outer shell (1) has a control port (7) communicating with the grouting space (5). The drive assembly (3) includes a plurality of translation cylinders (31), the movable ends of which are parallel to the inner shell (2) and connected to the inner sidewall of the inner shell (2); Each of the sealing components (4) includes a set of shield tail brushes (41), one set of shield tail brushes (41) is disposed on the outer shell (1), and the other set of shield tail brushes (41) is disposed on the inner shell (2); the shield tail brushes (41) disposed on the outer shell (1) are detachably connected to the outer shell (1), and the shield tail brushes (41) disposed on the inner shell (2) are detachably connected to the inner shell (2); The outer shell (1) is made of transparent organic glass.

2. The test device for the synchronous grouting system of a tunneling machine according to claim 1, characterized in that: The control ports (7) are distributed in multiple locations on the outer casing (1).

3. The test device for the synchronous grouting system of a tunneling machine according to claim 1, characterized in that: The outer sidewall of the inner shell (2) and the inner sidewall of the outer shell (1) are both coated with resin.

4. The test device for the synchronous grouting system of a tunneling machine according to claim 1, characterized in that: The grouting ports (6) are distributed in multiple ways on the inner shell (2).

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