Ultra-deep diaphragm wall pebble bed groove wall anchoring early warning device

Abstract

The invention discloses an ultra-deep diaphragm wall pebble bed groove wall anchoring early warning device, which relates to the technical field of urban rail transit underground engineering construction, and comprises a guide frame, a grouting assembly, a hollow drill rod assembly and a control early warning assembly, a vibration motor is fixedly mounted on one side of the guide frame; the hollow drill rod assembly comprises a rod body, a drill bit is arranged at one end of the rod body, and the other end of the rod body is fixedly installed at the output end of a vibration motor. A plurality of expandable anchoring units are uniformly arranged on the peripheral wall of the rod body; the grouting assembly comprises a slurry storage tank, and an outlet of the slurry storage tank is provided with a grouting pump; a grouting channel is formed in the rod body, each expandable anchoring unit communicates with the grouting channel, and the output end of the grouting pump communicates with the grouting channel through a grouting pipe; the control early warning assembly is arranged at the top of the guide frame, and the grouting pump, the vibration motor, the expandable anchoring unit and the moving assembly are all electrically connected with the control early warning assembly. According to the method, active pre-reinforcement and real-time monitoring and early warning of the groove wall soil body are achieved, and the safety and controllability of construction are remarkably improved.

Description

Technical Field

[0001] This invention belongs to the field of construction technology for underground engineering of urban rail transit, and relates to an early warning device for anchoring the wall of an ultra-deep diaphragm wall pebble layer. Background Technology

[0002] As urban underground rail transit develops towards deeper and denser infrastructure, the construction depth of underground projects such as subway stations is constantly increasing, and the surrounding environmental conditions are becoming increasingly complex. The project site has a high confined water head, and the diaphragm wall needs to penetrate thick layers of gravel and pebble. This stratum has a high pebble content, large particle size, and little filler, resulting in poor self-stability and a high risk of trench wall collapse, making it difficult to guarantee the quality of the completed wall and significantly increasing the construction difficulty.

[0003] Existing technologies for trench wall reinforcement have significant limitations. First, material modification methods (such as adding curing agents) typically require long curing times, making them difficult to adapt to the continuous and rapid pace of trenching construction, and the reinforcement range and effect are not easily controlled. Second, relying on adjusting mud properties after trenching (such as increasing viscosity or specific gravity) is reactive and cannot prevent initial borehole collapse. In ultra-high water pressure and highly permeable strata, the mud wall protection effect is easily weakened. While the combined milling and grapple process can handle general hard layers, the significant excavation vibration can exacerbate soil disturbance to adjacent bridge piles. Backfilling after trench wall collapse is a reactive measure, which is not only time-consuming and inefficient, but also results in poor bonding between the backfill material and the original strata. Repeated correction operations themselves can cause multiple additional disturbances to the viaduct foundation, leading to poor safety. More importantly, existing methods lack the ability to perceive and warn of the deformation and stability of the trench wall in real time, and cannot identify risks and implement proactive intervention before the hole collapses. Therefore, they are not suitable for complex conditions such as thick pebbles, high-pressure water, and proximity to sensitive structures. Summary of the Invention

[0004] In view of this, the present invention provides an early warning device for anchoring the wall of an ultra-deep diaphragm wall pebble layer trench, in order to solve the problems mentioned in the background art, and specifically discloses the following contents: An early warning device for anchoring the wall of an ultra-deep diaphragm wall pebble layer includes a guide frame, a grouting assembly, a hollow drill rod assembly, and a control and early warning assembly; A vibration motor is fixedly installed on one side of the guide frame; the hollow drill rod assembly includes a rod body, one end of which is provided with a drill bit, and the other end of which is fixedly installed on the output end of the vibration motor; a plurality of expandable anchoring units are evenly provided on the peripheral wall of the rod body; The grouting assembly includes a grout storage tank fixedly installed on the other side of the guide frame, and a grouting pump is provided at the outlet of the grout storage tank; a grouting channel is provided inside the rod body, and each of the expandable anchoring units is connected to the grouting channel; the output end of the grouting pump is connected to the inlet of the grouting channel through a grouting pipe. The bottom end of the guide frame is equipped with a movable component; The control and early warning component is located on the top of the guide frame, and the grouting pump, the vibration motor, the expandable anchoring unit, and the moving component are all electrically connected to the control and early warning component.

[0005] Furthermore, the expandable anchoring unit includes an expandable membrane bag anchor head; one end of the expandable membrane bag anchor head is open and connected to the grouting channel through a pipeline, and the other end of the expandable membrane bag anchor head extends outward from the rod body; the expandable membrane bag anchor head is provided with a reinforcing body inside, and an embedded sensor is integrated inside the reinforcing body, and the embedded sensor is electrically connected to the control and early warning component.

[0006] Furthermore, the expandable membrane bag anchor head is made of a high-toughness rubber composite material, and the surface of the expandable membrane bag anchor head is provided with a reinforcing fiber mesh.

[0007] Furthermore, the reinforcing body is a fiber-reinforced composite material reinforcement or a smart sensing reinforcement.

[0008] Furthermore, the grouting pipe is equipped with a pressure sensor and a flow meter, and the pressure sensor and the flow meter are electrically connected to the control and early warning component.

[0009] Furthermore, the drill bit is embedded with a diamond composite sheet; three sets of γ-γ density detectors are uniformly embedded on the peripheral wall of the drill bit to obtain the mud density ρ0 at the drill bit, which serves as the original parameter for judging the precursors of trench collapse.

[0010] Furthermore, the control and early warning component includes a control unit, a communication transmission module, and an audible and visual alarm; the control unit is connected to an external mobile terminal through the communication transmission module; the grouting pump, the vibration motor, the expandable anchoring unit, the mobile component, and the audible and visual alarm are all electrically connected to the control unit.

[0011] The beneficial effects of this invention are as follows: This invention injects reinforcing grout into expandable anchoring units through a grouting assembly, causing the expandable anchoring units to expand and form enlarged head anchoring ends, which significantly improves the anchoring force and pull-out resistance in the pebble layer. At the same time, through embedded sensors and control and early warning components, real-time monitoring and early warning of the stability of the trench wall are realized, which greatly improves the safety and controllability of ultra-deep diaphragm wall construction under complex geological conditions. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the structure of an early warning device for anchoring the pebble layer trench wall of an ultra-deep diaphragm wall according to the present invention.

[0014] Figure 2 This is a schematic diagram of the hollow drill pipe assembly in this invention.

[0015] Figure 3 This is a schematic diagram of the expandable anchoring unit of the present invention.

[0016] Figure 4 This is a schematic diagram of the expandable anchoring unit of the present invention in an expanded state.

[0017] In the figure: 1-Guide frame; 11-Moving component; 2-Vibration motor; 3-Rod; 31-Grouting channel; 4-Drill bit; 5-Expandable membrane bag anchor head; 51-Reinforcing body; 52-Reinforcing fiber mesh; 6-Grouting tank; 7-Grouting pump; 8-Grouting pipe; 81-Pressure sensor; 82-Flow meter; 9-Control unit; 91-Embedded sensor; 92-Communication transmission module; 93-Audible and visual alarm. Detailed Implementation

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be used interchangeably where appropriate for the purposes of describing embodiments of this application herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or device that includes a series of steps or components is not necessarily limited to those explicitly listed, but may include other steps or components not explicitly listed or inherent to such processes, methods, products, or devices.

[0020] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0021] Furthermore, some of the aforementioned terms, besides indicating location or positional relationships, may also have other meanings. For example, the term "above" may, in certain circumstances, indicate a dependency or connection. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0022] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0023] See appendix Figure 1-4 The present invention discloses an early warning device for anchoring the wall of an ultra-deep diaphragm pebble layer trench, including a guide frame 1, a grouting assembly, a hollow drill rod assembly, and a control and early warning assembly; A vibration motor 2 is fixedly installed on one side of the guide frame 1; the hollow drill rod assembly includes a rod body 3, one end of which is provided with a drill bit 4, and the other end of the rod body 3 is fixedly installed at the output end of the vibration motor 2; multiple expandable anchoring units are evenly provided on the periphery of the rod body 3; The grouting assembly includes a grout storage tank 6 fixedly installed on the other side of the guide frame 1, and a grouting pump 7 is provided at the outlet of the grout storage tank 6; a grouting channel 31 is provided inside the rod body 3, and each expandable anchoring unit is connected to the grouting channel 31. The output end of the grouting pump 7 is connected to the inlet of the grouting channel 31 through the grouting pipe 8. The bottom end of the guide frame 1 is provided with a movable component 11; The control and early warning component is located on the top of the guide frame 1. The grouting pump 7, the vibration motor 2, the expandable anchoring unit, and the moving component 11 are all electrically connected to the control and early warning component.

[0024] In this embodiment, the vibration motor 2 drives the rod body 3 and the drill bit 4 to vibrate and drill to a predetermined depth. The length of the grouting pipe 8 is sufficient to drive the rod body 3 to vibrate. The vibration motor 2 is provided with a clearance hole for the grouting pipe 8. The grouting pump 7 injects the reinforcing grout in the grout storage tank 6 into the expandable anchoring unit, causing the expandable anchoring unit to expand and form an enlarged head anchoring end, thereby enhancing the pull-out resistance.

[0025] In this embodiment, the grout storage tank 6 has a capacity of 500L, and the grouting pump 7 has a maximum grouting pressure of 10MPa, which can meet the grouting requirements of thick pebble layers.

[0026] In this embodiment, the rod body 3 is made of 42CrMo alloy steel with an outer diameter of 146mm and a wall thickness of 10mm. It can withstand the high torque and high pressure during deep hole drilling. Preferably, the outer surface of the rod body 3 is provided with a wear-resistant alloy coating with a coating thickness of 0.2mm, which can effectively resist the wear of the pebble layer and extend the service life of the rod body 3.

[0027] The expandable anchoring unit includes an expandable membrane bag anchor head 5; one end of the expandable membrane bag anchor head 5 is open and connected to the grouting channel 31 through a pipeline, and the other end of the expandable membrane bag anchor head 5 extends outward from the rod body 3; the expandable membrane bag anchor head 5 is provided with a reinforcing body 51 inside, and an embedded sensor 91 is integrated inside the reinforcing body 51, which is electrically connected to the control and early warning components.

[0028] In this embodiment, the embedded sensor 91 is used to monitor the axial force of the rod, the pressure of the surrounding soil, and deformation data; the early warning component has a built-in safety threshold discrimination algorithm, which can calculate the safety factor of the anchoring system in real time.

[0029] The expandable membrane bag anchor head 5 is made of high-toughness rubber composite material, and the surface of the expandable membrane bag anchor head 5 is provided with a reinforcing fiber mesh 52.

[0030] In this embodiment, the expandable membrane bag anchor head 5 is made of a high-toughness rubber composite material with a compressive strength of not less than 15 MPa. When the grout is injected, the expandable membrane bag anchor head 5 expands controllably under the grout pressure, forming an expanded anchor end with a diameter increased by 2-3 times. The expansion process of the expandable membrane bag anchor head 5 is divided into three stages: the first stage is the initial expansion stage, when the grout pressure reaches 3 MPa, the membrane bag begins to expand, and the expansion diameter is 200 mm; the second stage is the continuous expansion stage, when the grout pressure continues to rise to 5 MPa, and the membrane bag expansion diameter reaches 300 mm; the third stage is the stable expansion stage, when the grout pressure is maintained at 5 MPa, and the membrane bag expansion diameter is stabilized at 300-450 mm, forming the expanded anchor end.

[0031] The reinforcing body 51 is a fiber-reinforced composite material reinforcement or a smart sensing reinforcement.

[0032] In this embodiment, the stiffener 51 has a diameter of 32 mm, a tensile strength of not less than 1860 MPa, and an elastic modulus of 195 ± 10 GPa.

[0033] The grouting pipe 8 is equipped with a pressure sensor 81 and a flow meter 82, which are electrically connected to a control and early warning component.

[0034] In this embodiment, the pressure sensor 81 and the flow meter 82 monitor the grouting parameters in real time and feed them back to the control and early warning component.

[0035] The drill bit 4 is inlaid with a diamond composite sheet; three sets of γ-γ density detectors are evenly inlaid on the periphery of the drill bit 4 to obtain the mud density ρ0 at the drill bit 4, which serves as the original parameter for judging the signs of the collapse of the trench section.

[0036] The control and early warning components include a control unit 9, a communication transmission module 92, and an audible and visual alarm 93; the control unit 9 is connected to an external mobile terminal through the communication transmission module 92; the grouting pump 7, the vibration motor 2, the expandable anchoring unit, the moving component 11, and the audible and visual alarm 93 are all electrically connected to the control unit 9.

[0037] In this embodiment, when the monitoring data received by the control unit 9 exceeds the preset threshold, it transmits the data to an external mobile terminal through the communication transmission module 92 and triggers the audible and visual alarm 93.

[0038] The working principle of this embodiment is as follows: During construction, the control unit 9 first drives the vibration motor 2 and the moving component 11 to precisely drill the hollow drill rod assembly to the designed depth. During this process, the γ-γ density detector embedded in the side wall of the drill bit 4 is used to sense the change in the density of the mud around the hole in real time and identify signs of collapse. Then, the grouting component is started, and the grout is injected through the grouting channel 31. First, it inflates the expandable membrane bag anchor head 5 to form a mechanical enlarged head anchor end. At the same time, the embedded sensor 91 senses the strain of the anchor section in real time. The control unit 9 uses the embedded sensor 91 to monitor the axial force of the rod body 3, the pressure of the surrounding soil, and deformation data. When the received monitoring data exceeds the preset threshold, the control unit 9 transmits the data to the external mobile terminal through the communication transmission module 92 and triggers the audible and visual alarm 93 to achieve advanced judgment and real-time active control of the trench wall stability. Ultimately, it achieves the integrated effect of active reinforcement before trenching, real-time monitoring during construction, and advanced risk intervention.

[0039] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A pre-warning device for anchoring the wall of an ultra-deep diaphragm wall pebble layer trench, characterized in that, Includes guide frame (1), grouting assembly, hollow drill pipe assembly and control and early warning assembly; A vibration motor (2) is fixedly installed on one side of the guide frame (1); the hollow drill rod assembly includes a rod body (3), one end of the rod body (3) is provided with a drill bit (4), and the other end of the rod body (3) is fixedly installed at the output end of the vibration motor (2); a plurality of expandable anchoring units are evenly provided on the periphery of the rod body (3). The grouting assembly includes a grout storage tank (6) fixedly installed on the other side of the guide frame (1), and a grouting pump (7) is provided at the outlet of the grout storage tank (6); a grouting channel (31) is provided inside the rod body (3), and each of the expandable anchoring units is connected to the grouting channel (31), and the output end of the grouting pump (7) is connected to the inlet of the grouting channel (31) through a grouting pipe (8); The bottom end of the guide frame (1) is provided with a moving component (11). The control and early warning component is located on the top of the guide frame (1), and the grouting pump (7), the vibration motor (2), the expandable anchoring unit and the moving component (11) are all electrically connected to the control and early warning component.

2. The early warning device for anchoring the wall of an ultra-deep diaphragm wall pebble layer according to claim 1, characterized in that, The expandable anchoring unit includes an expandable membrane bag anchor head (5); one end of the expandable membrane bag anchor head (5) is open and connected to the grouting channel (31) through a pipeline, and the other end of the expandable membrane bag anchor head (5) extends outward from the rod body (3); the expandable membrane bag anchor head (5) is provided with a reinforcing body (51) inside, and an embedded sensor (91) is integrated inside the reinforcing body (51), and the embedded sensor (91) is electrically connected to the control and early warning component.

3. The early warning device for anchoring the wall of an ultra-deep diaphragm wall pebble layer according to claim 2, characterized in that, The expandable membrane bag anchor head (5) is made of high-toughness rubber composite material, and the surface of the expandable membrane bag anchor head (5) is provided with a reinforcing fiber mesh (52).

4. The early warning device for anchoring the wall of an ultra-deep diaphragm wall pebble layer according to claim 2, characterized in that, The reinforcing body (51) is a fiber-reinforced composite material reinforcement or a smart sensing reinforcement.

5. The early warning device for anchoring the wall of an ultra-deep diaphragm wall pebble layer according to claim 1, characterized in that, The grouting pipe (8) is equipped with a pressure sensor (81) and a flow meter (82), and the pressure sensor (81) and the flow meter (82) are electrically connected to the control and early warning component.

6. The early warning device for anchoring the wall of an ultra-deep diaphragm wall pebble layer according to claim 1, characterized in that, The drill bit (4) is inlaid with a diamond composite sheet; three sets of γ-γ density detectors are uniformly inlaid on the periphery of the drill bit (4) to obtain the mud density ρ0 at the drill bit (4) as the original parameter for judging the signs of collapse of the trench section.

7. The early warning device for anchoring the wall of an ultra-deep diaphragm wall pebble layer according to claim 1, characterized in that, The control and early warning component includes a control unit (9), a communication transmission module (92), and an audible and visual alarm (93); the control unit (9) is connected to an external mobile terminal through the communication transmission module (92); the grouting pump (7), the vibration motor (2), the expandable anchoring unit, the mobile component (11), and the audible and visual alarm (93) are all electrically connected to the control unit (9).

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