Devices and methods for controlling deep soil disturbance in confined spaces

Abstract

This invention relates to a device and method for controlling deep soil disturbance in confined spaces. The device includes: a grouting pipe with a grout inlet and a grout outlet, the grouting pipe being a flexible hose; a slip ring slidably fitted around the outer periphery of the grouting pipe, the slip ring including a sleeve, a rubber ring, and a pad, the inner wall of the lower end of the sleeve forming a conical mating surface, the upper end of the rubber ring forming a conical structure, the rubber ring extending into the sleeve from the lower end, and the pad located below the rubber ring; a bladder located outside the grouting pipe, one end of the bladder connected to the sleeve so that the bladder can conform to the outer surface of the grouting pipe during lowering, the grout outlet being located within the coverage area of ​​the bladder; and an inclinometer located on the outer wall of the grouting pipe and within the coverage area of ​​the bladder. This invention is suitable for lowering small-diameter boreholes in confined spaces, eliminating the need for large lifting equipment, avoiding material waste and secondary disturbance caused by blind grouting, and improving the efficiency and reliability of deep soil treatment in confined spaces.

Description

Technical Field

[0001] This invention belongs to the field of underground geotechnical engineering construction technology, specifically relating to a device and method for controlling deep soil disturbance in confined spaces. Background Technology

[0002] In deformation-sensitive areas, it is necessary to control ground disturbances caused by geotechnical engineering. Currently, grouting technology is widely used as an active control method to reinforce strata and fill gaps between soil and structure caused by excavation. However, in strata with high groundwater flow velocities, grout is difficult to form. To solve this problem, capsule grouting technology has emerged, in which grouting is carried out in a capsule.

[0003] For example, Chinese patent applications, publication / announcement number CN108411920 A, entitled "A Multi-point Bag-type Grouting Device and Method for Controlling Soil Deformation"; CN113638398A, entitled "A Method for Active Dynamic Control of Soil Stress in Bag-type Grouting"; CN108755699B, entitled "A Method and Device for Deformation Control of Soil Surrounding a Foundation Pit"; and CN107524455A, entitled "A Multi-segment Compactor Sleeve Valve Pipe and its Grouting Method," all involve bag-type grouting technology, where a bag is placed on the outside of the grouting pipe or sleeve valve pipe to limit the grouting range.

[0004] However, existing bag grouting methods are not suitable for grouting construction in deep soil in confined spaces. In confined spaces, it is impossible to use a crane when lowering the grouting pipe and bag. When used for deep soil, the grouting pipe and bag are long and heavy, making it difficult to lower them vertically by hand. Summary of the Invention

[0005] In view of the above-mentioned defects or deficiencies in the prior art, the present invention proposes a deep soil disturbance control device suitable for confined spaces, comprising: a grouting pipe having a grout inlet and a grout outlet, the grouting pipe being a flexible hose; a slip ring slidably sleeved on the outer periphery of the grouting pipe, the slip ring comprising a sleeve, a rubber ring, and a pad, the inner wall of the lower end of the sleeve forming a conical mating surface, the upper end of the rubber ring forming a conical structure, the rubber ring extending into the sleeve from the lower end, and the pad located below the rubber ring; a bladder located outside the grouting pipe, one end of the bladder being connected to the sleeve so that the bladder can conform to the outer surface of the grouting pipe during lowering, the grout outlet being located within the coverage area of ​​the bladder; an inclinometer located on the outer wall of the grouting pipe and within the coverage area of ​​the bladder; the inclinometer being adapted to monitor horizontal displacement data of the soil; and a controller communicatively connected to the inclinometer to activate the grouting equipment and perform grouting operations based on the monitored horizontal displacement data of the soil.

[0006] In one alternative technical solution, the pouch is olive-shaped.

[0007] In one alternative technical solution, a slip ring is slidably provided on the grouting pipe, and one end of the bladder is connected to the slip ring.

[0008] In one alternative technical solution, the slip ring includes a sleeve, a rubber ring, and a pad. The inner wall of the lower end of the sleeve forms a tapered mating surface, the upper end of the rubber ring forms a tapered structure, the rubber ring extends into the sleeve from the lower end, and the pad is located below the rubber ring.

[0009] In one alternative technical solution, the side wall of the grouting pipe is provided with a wire hole for threading a cable to bind multiple inclinometers to the outer wall of the grouting pipe.

[0010] In one alternative technical solution, both the sleeve and the gasket are made of metal.

[0011] In one alternative technical solution, the grouting pipe is made of PE, so that the grouting pipe can be arranged in a disc shape.

[0012] This invention also proposes a method for controlling deep soil disturbance in confined spaces, comprising: determining the grouting range; drilling holes on the ground surface based on the grouting range, with the drilling depth covering the grouting range; after drilling is completed, lowering the deep soil disturbance control device for confined spaces as described in any one of the above methods; analyzing the horizontal displacement data of the deep soil based on the horizontal displacement data of the soil monitored by the inclinometer of the deep soil disturbance control device for confined spaces; when the maximum horizontal displacement reaches the control value, starting the grouting equipment to perform grouting operations; wherein, after grouting begins, as the sac expands under the grouting pressure, grouting is stopped when any of the following conditions are met: the grouting pressure reaches 2MPa, the horizontal displacement returns to the control range, or the grouting volume reaches the sac volume.

[0013] In one optional technical solution, determining the grouting range specifically includes: performing finite element simulation on the excavation construction to obtain a soil displacement cloud map; obtaining the maximum displacement position based on the soil displacement cloud map; taking the maximum displacement position as the grouting center position; extending the maximum displacement position along the vertical direction until the displacement gradient in the soil displacement cloud map tends to be gentle and the displacement value stabilizes at a preset position, which is taken as the grouting range.

[0014] In one alternative technical solution, the slip ring of the deep soil disturbance control device suitable for confined spaces gradually slides downward under the tension of the bladder, causing the sleeve and the pad to jointly squeeze the rubber ring, thereby achieving the grout-stopping effect.

[0015] The beneficial effects of this invention are as follows: This invention uses a flexible grouting pipe combined with a slidable and fitting bag to adapt to the lowering requirements of small-diameter boreholes in confined spaces, eliminating the need for large lifting equipment; the inclinometer and controller within the bag's coverage area are linked to monitor the horizontal displacement of the soil in real time and automatically trigger the grouting operation, achieving precise closed-loop control of deep soil disturbance. This avoids material waste and secondary disturbance caused by blind grouting, and the simple structural design reduces construction costs and operational difficulty, improving the efficiency and reliability of deep soil treatment in confined spaces. Attached Figure Description

[0016] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0017] Figure 1 This is a schematic diagram of the main structure of a deep soil disturbance control device suitable for confined spaces, provided in an embodiment of the present invention.

[0018] Figure 2 A schematic diagram of the structure of the bag of a deep soil disturbance control device suitable for confined spaces provided in an embodiment of the present invention after grouting;

[0019] Figure 3 An exploded view of the slip ring of a deep soil disturbance control device suitable for confined spaces, provided in an embodiment of the present invention.

[0020] Figure 4 A schematic diagram of the cutaway structure of the slip ring of a deep soil disturbance control device suitable for confined spaces, provided in an embodiment of the present invention.

[0021] Figure 5 A three-dimensional structural diagram of the bottom end of a deep soil disturbance control device suitable for confined spaces, provided in an embodiment of the present invention;

[0022] Figure 6 A schematic diagram of the installation state structure of the inclinometer of a deep soil disturbance control device suitable for confined spaces, provided in an embodiment of the present invention.

[0023] Figure 7 A schematic diagram of the disc-shaped structure of the grouting pipe of a deep soil disturbance control device suitable for confined spaces, provided in an embodiment of the present invention.

[0024] Attached diagram descriptions: 1-Grouting pipe; 2-Slip ring; 3-Bag; 4-Bottom end; 5-Inclinometer; 6-Cable; 7-Sleeve; 8-Rubber ring; 9-Plate; 10-Rubber plug. Detailed Implementation

[0025] The following is in conjunction with the appendix Figures 1 to 7 The present application will be further described in detail with reference to the embodiments. It is understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention. It should also be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] Please refer to Figure 1 and Figure 2 This invention provides a deep soil disturbance control device suitable for confined spaces.

[0028] A deep soil disturbance control device suitable for confined spaces includes: a grouting pipe 1, having a grout inlet and a grout outlet, the grouting pipe 1 being a flexible hose; a slip ring 2, slidably sleeved on the outer periphery of the grouting pipe 1, the slip ring 2 including a sleeve 7, a rubber ring 8, and a pad 9, the inner wall of the lower end of the sleeve 7 forming a conical mating surface, the upper end of the rubber ring 8 forming a conical structure, the rubber ring 8 extending into the sleeve 7 from the lower end, and the pad 9 located below the rubber ring 8; a bag 3, disposed outside the grouting pipe 1, one end of the bag 3 connected to the sleeve 7 so that the bag 3 can conform to the outer surface of the grouting pipe 1 during lowering, the grout outlet being located within the coverage area of ​​the bag 3; an inclinometer 5, disposed on the outer wall of the grouting pipe 1 and within the coverage area of ​​the bag 3, the inclinometer 5 being suitable for monitoring horizontal displacement data of the soil; and a controller, communicatively connected to the inclinometer 5, to activate the grouting equipment and perform grouting operations based on the monitored horizontal displacement data of the soil.

[0029] like Figure 3 and Figure 4 As shown, the conical structure at the upper end of the rubber ring 8 forms a wedge-shaped extrusion surface with the insertion fit at the lower end of the sleeve 7. When the sleeve 7 and the pad 9 jointly extrude the rubber ring 8, the conical mating surface can convert the extrusion force into radial expansion force, making the rubber ring 8 fit more tightly against the outer wall of the grouting pipe 1, forming a double seal (axial clamping + radial tightness), effectively preventing the grout from flowing upward.

[0030] The rubber ring 8 is at least partially located inside the sleeve 7. The sleeve 7 provides radial restraint for the rubber ring 8, preventing the rubber ring 8 from deflecting or flipping during the extrusion process, ensuring the integrity of the sealing surface, and further enhancing the reliability of the grout stop.

[0031] The conical structure provides guidance for the insertion and displacement of the rubber ring 8, so that the extrusion action of the pad 9 and the sleeve 7 is carried out synchronously along the axis of the conical surface, avoiding uneven force on the rubber ring 8 caused by misalignment, and ensuring that the extrusion process is stable and controllable.

[0032] The wedge-shaped structural design allows the extrusion pressure to increase with the insertion depth of the rubber ring 8, enabling gradual adjustment of the sealing degree of the rubber ring 8 and adapting to the grouting requirements under different grouting pressures.

[0033] The conical structure of the rubber ring 8 is an assembly design, and the sleeve 7 can also be quickly fitted with the rubber ring 8 without complicated snap-fit ​​or adhesive processes. The assembly and replacement of the rubber ring 8 is simple.

[0034] The tapered fit has a reasonable clearance, which can accommodate the dimensional changes of the rubber ring 8 due to aging and compression, reducing the frequency of component replacement and lowering maintenance costs.

[0035] Grouting pipe 1 can be made of flexible hose, which can be laid flat on the ground without the need for vertical lifting by a crane, greatly reducing the space requirements. The grouting pipe 1 is designed as a single piece without joints, avoiding the risk of joint breakage during the pipe laying process, and is suitable for hoisting and pipe laying operations in narrow spaces.

[0036] The bladder 3 can conform to the outer surface of the grouting pipe 1 and shrink, allowing the bladder 3 to be enlarged through a small-diameter borehole (150mm), thus solving the problem of limited borehole diameter in confined spaces.

[0037] Inclinometer 5 is installed within the coverage area of ​​bag 3 and cable holes are installed both inside and outside the grouting area. It can monitor the horizontal displacement data of deep soil in real time and accurately, providing a direct basis for grouting timing and grouting volume.

[0038] The controller is linked with the inclinometer 5 and can automatically trigger grouting operations based on displacement data, realizing active and closed-loop control of soil disturbance, avoiding over-grouting or under-grouting, and accurately compensating for the volume loss of soil caused by excavation.

[0039] The grouting cessation conditions (pressure 2MPa, displacement recovery, and full capacity of bladder 3) are subject to multiple limitations to prevent overpressure rupture of bladder 3 and reduce construction safety hazards. Grouting pipe 1 is made of PE100 grade pipe with a nominal pressure of 2.0MPa, which meets the grouting pressure requirements and ensures the strength and sealing performance of the pipe.

[0040] The bag 3 is olive-shaped. The bag 3 is made from fire hose, which is readily available and easy to process.

[0041] The olive-shaped structure, thick in the middle and thin at both ends, can form a concentrated and uniform radial extrusion force on the deep soil after grouting expansion, accurately compensating for the soil volume loss caused by excavation and avoiding secondary soil disturbance caused by excessive or insufficient local extrusion force.

[0042] This shape is suitable for the need to lower small-diameter boreholes in confined spaces. When it contracts, it can fit tightly against the outer wall of the grouting pipe 1. After it is lowered, it expands to maximize the coverage of the grouting range. In particular, it can achieve targeted soil compression, especially for the maximum displacement point (grouting center) on the displacement cloud map.

[0043] The materials for the bag 3 are readily available and inexpensive. Fire hoses are commonly used consumables in engineering, and procurement and on-site processing are convenient. There is no need to customize special flexible materials, which greatly reduces the production cost and cycle of the device.

[0044] Fire hoses are inherently resistant to high pressure, abrasion, and have good flexibility. They can withstand 2MPa grouting pressure without breaking and can be laid flat on the ground with the grouting pipe 1, making them suitable for construction conditions in confined spaces. The cutting and sewing process is simple, and the length of the bag 3 can be flexibly adjusted according to the grouting range to meet different project needs.

[0045] Fire hoses have excellent waterproof and seepage-proof properties. As a bag 3, they can effectively prevent grout leakage, ensure stable transmission of grouting pressure, and ensure the effect of soil compression.

[0046] A slip ring 2 is slidably mounted on the grouting pipe 1, and one end of the bladder 3 is connected to the slip ring 2. The slip ring 2, the bladder 3, and the grouting pipe 1 are assembled using a hose clamp, which greatly improves the efficiency of disassembly, assembly, and adjustment.

[0047] The hose clamp binding is a quick-installation and quick-disassembly connection, which eliminates the need for complex processes such as welding and thread tightening. On-site assembly / disassembly and position adjustment of slip ring 2, bladder 3, and grouting pipe 1 can be completed simply by tightening the hose clamp bolts, which greatly shortens the time for construction preparation and equipment adjustment.

[0048] The slip ring 2 and the grouting pipe 1 are in sliding fit, and the position can be freely adjusted along the grouting pipe 1. It can flexibly adapt to the stretching / contraction requirements of the bag 3 according to the grouting range. No additional tools are required during the debugging process, and the operation is easy.

[0049] The sliding design of the slip ring 2 allows one end of the bag 3 to move with it. When lowering, the slip ring 2 moves upward so that the bag 3 fits tightly against the outer wall of the grouting pipe 1, enabling the smooth lowering of the large-volume bag 3 into the small-diameter borehole, perfectly adapting to the construction limitations of narrow sites. During grouting, the slip ring 2 moves downward with the expansion of the bag 3, ensuring that the bag 3 fully expands and maximizing the soil compression effect.

[0050] The tightness of the hose clamp can be flexibly adjusted to fit the interfaces of different specifications of grouting pipe 1 and bladder 3, and the binding position can be adjusted at any time according to construction needs to adapt to grouting operations of different depths and ranges.

[0051] The hose clamp binding can form a uniform ring-shaped clamping force, so that the connection surface of the slip ring 2, the bladder 3, and the grouting pipe 1 fits tightly, avoiding the problem of joint loosening and grout leakage caused by grout pressure impact during the grouting process.

[0052] like Figure 6 As shown, the side wall of the grouting pipe 1 is provided with a wire hole for threading a cable 6 so as to bind multiple inclinometers 5 to the outer wall of the grouting pipe 1.

[0053] The wire hole on the side wall of the grouting pipe 1 allows for the orderly installation and limiting of the inclinometer 5 cable 6, preventing the cable 6 from becoming entangled, worn, or damaged by soil compression during the device lowering and grouting operations, thus ensuring the stability and continuity of the inclinometer 5 signal transmission.

[0054] The wire hole provides a positioning reference for binding the inclinometer 5, which can ensure that multiple inclinometers 5 are evenly and accurately arranged along the outer wall of the grouting pipe 1, avoiding distortion of soil displacement monitoring data caused by the positional deviation of the inclinometer 5. At the same time, the binding operation can prevent the inclinometer 5 from falling off under the impact of grouting pressure.

[0055] The wire hole is integrated into the side wall of the grouting pipe 1, eliminating the need for additional cable 6 fixing components, simplifying the overall structure of the device and making it suitable for construction operations in confined spaces; after the cable 6 is threaded through the wire hole, the subsequent disassembly, assembly, and position adjustment of the inclinometer 5 are also more convenient and efficient.

[0056] Both the sleeve 7 and the gasket 9 are made of metal.

[0057] like Figure 7 As shown, the grouting pipe 1 is made of PE, allowing it to be arranged in a coil shape. The grouting pipe 1 is transported in a coil and connected by hot-melt metal internal wires, simplifying the on-site assembly process and saving transportation and construction space in confined areas.

[0058] This invention also proposes a method for controlling deep soil disturbance in confined spaces, comprising the following steps:

[0059] Step S101: Determine the grouting range;

[0060] Step S102: Based on the grouting range, drill holes on the ground surface, with the drilling depth covering the grouting range;

[0061] Step S103: After drilling is completed, lower any of the deep soil disturbance control devices suitable for confined spaces.

[0062] Step S104: Based on the horizontal displacement data of the soil monitored by the inclinometer of the deep soil disturbance control device suitable for confined spaces, the horizontal displacement of the deep soil is analyzed and obtained.

[0063] Step S105: When the maximum horizontal displacement reaches the control value, the grouting equipment is turned on to carry out grouting operations; wherein, after grouting begins, as the bladder expands under the grouting pressure, grouting is stopped when any of the following conditions are met: the grouting pressure reaches 2MPa, the horizontal displacement returns to the control range, or the grouting volume reaches the bladder volume.

[0064] Step S101 first clarifies the grouting range, and combined with the corresponding depth of drilling in S102, ensures that the device placement position is precisely matched with the disturbance control target; through real-time displacement monitoring of the inclinometer in S104, and in conjunction with the "grouting when displacement reaches the standard" triggering mechanism in S105, the active prediction and targeted treatment of soil disturbance are realized, avoiding secondary disturbance caused by blind grouting.

[0065] By setting any one of the following stopping conditions—"grouting pressure 2MPa, displacement recovery, grouting volume filling the grouting bag"—a quantitative grouting termination standard was constructed. This standard can prevent the grouting bag from rupturing and the soil from being excessively compressed due to excessive pressure, and can also avoid the disturbance control failure caused by insufficient grouting, thus ensuring the consistency and stability of the operation effect under different construction scenarios.

[0066] The device deployed in step S103 is designed for confined spaces. With the pre-planned grouting range and drilling depth, it eliminates the need for additional site excavation or the addition of large equipment, greatly simplifying the construction process. The automated triggering logic from monitoring to grouting reduces manual intervention, shortens the construction cycle, and improves work efficiency in confined spaces.

[0067] The grouting triggering mechanism based on real-time displacement data can respond promptly to soil deformation trends and reduce the risk of deep soil instability. The multiple safeguards of the triple grouting stop conditions prevent equipment damage or engineering accidents caused by the failure of a single indicator, thereby improving the safety and reliability of the overall construction process.

[0068] Further, step S101, determining the grouting range, specifically includes the following steps:

[0069] Step S1011: Perform finite element simulation of the excavation construction to obtain soil displacement cloud map;

[0070] Step S1012: Obtain the location of maximum displacement based on the soil displacement contour map;

[0071] Step S1013: Take the position with the maximum displacement as the grouting center position;

[0072] Step S1014: Extend vertically from the position of maximum displacement until the displacement gradient in the soil displacement cloud map tends to be gentle and the displacement value stabilizes at the preset position, which is the grouting range.

[0073] By generating soil displacement cloud maps through finite element simulation, the location of the maximum displacement in deep soil layers can be intuitively located. The preset location is a relatively low horizontal position, where the displacement value stabilizes. This location is then used as the grouting center. From this center, a vertical extension is made until the horizontal soil displacement is no more than 10% of the maximum displacement, which is then designated as the grouting location within the grouting area. Planning the vertically extending grouting area using this center ensures precise coverage of the core soil disturbance area, avoiding material waste due to an excessively large grouting area or disturbance control failure due to an excessively small area.

[0074] Determining the grouting range based on simulation data rather than experience allows for the early identification of disturbance distribution patterns in deep soil. Subsequent drilling, equipment placement, and grouting operations can then be carried out systematically around the target area, significantly reducing the need for repeated on-site adjustments and improving the construction efficiency of deep soil disturbance control in confined spaces.

[0075] Targeted grouting range planning can accurately match the layout of grouting devices and the amount of grouting, reducing unnecessary drilling and grouting material consumption, while also reducing the cost of secondary soil disturbance repair caused by unreasonable grouting range.

[0076] The slip ring of the deep soil disturbance control device, suitable for confined spaces, gradually slides downward under the tension of the bladder, causing the sleeve and pad to jointly squeeze the rubber ring, thus achieving the grout-stopping effect.

[0077] Based on the soil displacement cloud map generated by finite element simulation, the location of the maximum displacement can be accurately located and set as the grouting center. Then, the grouting range can be defined by extending vertically to the area with smaller displacement. This achieves precise coverage of the core area of ​​deep soil disturbance, avoiding material waste caused by an excessively large grouting range and eliminating the problem of disturbance control failure caused by an excessively small range, thus improving the effectiveness of disturbance management from the source.

[0078] From the simulated delineation of the grouting area to the surface drilling at the corresponding depth, the placement of specialized equipment, and the real-time monitoring of displacement data by inclinometers and the automatic triggering of grouting operations upon reaching the target, the entire construction process is guided by quantitative data, replacing the traditional experience-based judgment model. Subsequent drilling, equipment deployment, and grouting operations can all be carried out systematically around the target area, significantly reducing repeated adjustments on-site and greatly improving the construction efficiency of deep soil disturbance control in confined spaces.

[0079] The olive-shaped fire hose bag of the special device has the advantages of high pressure resistance, easy processing, and uniform expansion and extrusion pressure; the sleeve-conical rubber ring-pad structure of the slip ring can achieve double sealing to stop grouting and prevent grout from flowing upward; the assembly method of hose clamp binding greatly improves the efficiency of device disassembly, assembly and commissioning; the design of the flexible grouting pipe and the retractable bag is suitable for the requirements of small-diameter drilling in narrow sites, eliminating the need for large lifting equipment and reducing the impact of site space constraints.

[0080] Targeted grouting range planning can accurately match the device layout location and grouting volume, reducing unnecessary drilling and grouting material consumption; triple grouting stop conditions (pressure 2MPa, displacement recovery, and full sac filling) avoid sac rupture and secondary disturbance caused by overpressure grouting, reducing later repair costs; device components mostly use conventional materials and quick-assembly structures, further reducing equipment manufacturing, construction, and maintenance costs.

[0081] The inclinometer is deployed within the coverage area of ​​the grouting bag to collect real-time and accurate horizontal displacement data of deep soil. The controller automatically starts and stops the grouting equipment based on the data, forming a closed-loop control system of "monitoring-judgment-grouting". This mode can dynamically adjust the grouting operation according to the soil disturbance, avoiding over-grouting or under-grouting, ensuring stable recovery of deep soil displacement, and improving the safety and reliability of the construction process.

[0082] This invention provides an active control method for deep soil disturbance in confined spaces, comprising the following steps:

[0083] S1. Determine the grouting area;

[0084] This invention utilizes a grouting device to compress the soil, thereby compensating for the volume loss of soil caused by excavation and achieving the effect of controlling soil disturbance.

[0085] Finite element simulation of the excavation was performed to obtain soil displacement cloud maps;

[0086] The location of maximum displacement is taken as the grouting center location;

[0087] Extend vertically from the location of maximum displacement until the displacement gradient in the soil displacement cloud map tends to be gentle and the displacement value stabilizes at the preset position, which is taken as the grouting range;

[0088] S2. Grouting device assembly;

[0089] Based on the grouting range determined by S1, select the lengths of grouting pipe 1 and bladder 3;

[0090] Among them, the bladder 3 is olive-shaped, corresponding to the grouting range, and the center corresponds to the maximum value point of the displacement cloud map;

[0091] Among them, the material of the bag 3 is the fire hose that has been cut and sewn;

[0092] Among them, grouting pipe 1 is a PE100 grade pipe with an outer diameter of 50mm, a wall thickness of 5.6mm, and a nominal pressure of 2.0MPa;

[0093] Among them, the grouting pipe 1 is transported and placed on-site by coiling, which saves site space;

[0094] The grouting pipe 1 has metal inner wires heat-fused to both ends. One end is later used as a grouting device for the grounding meter, and the other end is connected to the bottom end 4. The structure of the bottom end 4 is as follows: Figure 5 As shown.

[0095] Two cable holes are made in the grouting pipe 1 for threading the cable of the mini inclinometer 5. Rubber plugs 10 are placed at the opening positions to prevent grout from overflowing.

[0096] Among them, there is one cable hole inside and one outside the grouting area;

[0097] Within the grouting area, grouting pipe 1 has a quincunx pattern for grout outlet;

[0098] Within the grouting area, multiple miniature inclinometers 5 are tied to the outside of the grouting pipe 1 and led out through the cable hole;

[0099] Connect the grouting pipe 1 to the bottom end 4, and then secure the bladder 3 to the bottom end 4 with a hose clamp;

[0100] Among them, the bottom end 4 is made of metal, the middle is a binding groove, and the upper end is an external thread connecting the grouting pipe 1.

[0101] Apply sealing grease to the outside of the grouting pipe 1, put the slip ring 2 into the grouting pipe 1, and secure the upper end of the bag 3 to the slip ring 2 with a hose clamp.

[0102] Among them, the inner diameter of slip ring 2 is equal to the outer diameter of grouting pipe 1;

[0103] Among them, the slip ring 2 is composed of a sleeve 7, a rubber ring 8 and a pad 9;

[0104] Among them, the sleeve 7 and the gasket 9 are made of metal, and the middle of the sleeve 7 has a binding groove;

[0105] Among them, the sealing grease can reduce the friction between the slip ring 2 and the grouting pipe 1, ensuring the sliding of the slip ring 2, and at the same time increase the sealing performance of the rubber ring 8 to prevent the grout from flowing upward.

[0106] S3. The grouting device is lowered;

[0107] Drill holes with a diameter of 150 mm and a depth covering the grouting area on the surface determined by S1.

[0108] After drilling is completed, the grouting device is lowered.

[0109] Among them, since the grouting pipe 1 is a PE pipe, it is flexible and can be laid flat on the ground without the need for a crane to lift it vertically before lowering it. In addition, the pipe body has no joints, so there is no possibility of joint breakage during the lowering process.

[0110] When lowering the pipe, the slip ring 2 of the olive-shaped bag 3 needs to be slid upward until the bag 3 is tightly attached to the grouting pipe 1, so as to reduce the volume of the grouting device and realize the purpose of lowering the large-volume bag 3 into the small-diameter borehole.

[0111] After the grouting device is lowered, sand is backfilled into the hole to fill the gaps and make it easier for the bag 3 to fit tightly with the surrounding soil.

[0112] The upper end of grouting pipe 1 is connected to the grouting pipeline;

[0113] Monitoring cable 6 is led out to the ground and connected to the automatic data acquisition equipment;

[0114] S4. Grouting construction;

[0115] During the excavation process, data from the inclinometer were monitored and analyzed to obtain the horizontal displacement of the deep soil.

[0116] When the maximum horizontal displacement reaches the control value, start the grouting equipment and carry out the grouting operation;

[0117] In this process, after grouting begins, as the bladder 3 expands under the grouting pressure, the slip ring 2 gradually slides downward under the tension of the bladder 3. At the same time, the slip ring sleeve 7 and the pad 9 jointly squeeze the rubber ring 8 to achieve the grouting stop effect.

[0118] Grouting should be stopped when any of the following conditions are met: grouting pressure reaches 2MPa, horizontal displacement returns to the control range, or grouting volume reaches 3 parts of the bladder volume.

[0119] After grouting is stopped, the upper end of the grouting pipe is sealed to prevent backflow of grout.

[0120] After the grout solidifies, the grouting pipes on the ground surface are removed to restore the ground surface.

[0121] This invention proposes an active control method for deep soil disturbance in confined spaces, which can solve the problems faced in deep soil grouting construction in such sites. First, by resolving the connection between the PE grouting pipe and the grouting bag, the problem of operating without a crane is solved. Second, by using an integrated grouting pipe, the problem of breakage of conventional sleeve valve pipe joints is solved. Third, by using an olive-shaped grouting bag and a slip ring, the problem of enlarging the volume of the grouting bag in a small borehole is solved, improving control capability. Fourth, by integrating the monitoring equipment with the grouting pipe, single-hole monitoring is achieved, eliminating the need for additional monitoring boreholes and simplifying construction.

[0122] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A deep soil disturbance control device suitable for confined spaces, characterized in that, include: The grouting pipe is equipped with a grout inlet and a grout outlet, and the grouting pipe is a flexible hose; A slip ring is slidably fitted around the outer periphery of the grouting pipe. The slip ring includes a sleeve, a rubber ring, and a pad. The inner wall of the lower end of the sleeve forms a conical mating surface, and the upper end of the rubber ring forms a conical structure. The rubber ring extends into the sleeve from the lower end, and the pad is located below the rubber ring. A bladder is disposed outside the grouting pipe, with one end of the bladder connected to the sleeve so that the bladder can fit against the outer surface of the grouting pipe during the lowering process, and the grout outlet is located within the coverage area of ​​the bladder. An inclinometer is installed on the outer wall of the grouting pipe and within the coverage area of ​​the bladder bag. The inclinometer is suitable for monitoring the horizontal displacement data of the soil. The controller is connected in communication with the inclinometer to activate the grouting equipment and perform grouting operations based on the monitored horizontal displacement data of the soil.

2. The deep soil disturbance control device suitable for confined spaces according to claim 1, characterized in that, The sac is olive-shaped.

3. The deep soil disturbance control device suitable for confined spaces according to claim 1, characterized in that, The side wall of the grouting pipe is provided with a wire hole for threading cables to bind multiple inclinometers to the outer wall of the grouting pipe.

4. The deep soil disturbance control device suitable for confined spaces according to claim 1, characterized in that, Both the sleeve and the gasket are made of metal.

5. The deep soil disturbance control device suitable for confined spaces according to any one of claims 1 to 4, characterized in that, The grouting pipe is made of PE so that it can be arranged in a disc shape.

6. A control method employing a deep soil disturbance control device suitable for confined spaces as described in any one of claims 1 to 5, characterized in that, include: Determine the grouting area; Based on the grouting range, boreholes are drilled on the ground surface, with the borehole depth covering the grouting range; After drilling is completed, the deep soil disturbance control device suitable for confined spaces is lowered down. Based on the horizontal displacement data of the soil monitored by the inclinometer of the deep soil disturbance control device suitable for confined spaces, the horizontal displacement of the deep soil is analyzed and obtained. When the maximum horizontal displacement reaches the control value, the grouting equipment is activated to carry out grouting operations. After grouting begins, the bladder expands under the grouting pressure. Grouting is stopped when any of the following conditions are met: the grouting pressure reaches 2 MPa, the horizontal displacement returns to the control range, or the grouting volume reaches the bladder volume.

7. The control method according to claim 6, characterized in that, Determine the grouting area, specifically including: Finite element simulation of the excavation was performed to obtain soil displacement cloud maps; The location of the maximum displacement is obtained based on the soil displacement cloud map; The position of maximum displacement is taken as the grouting center position; Extend the grouting range vertically from the position of maximum displacement until the displacement gradient in the soil displacement cloud map becomes gentle and the displacement value stabilizes at a preset position.

8. The control method according to claim 6, characterized in that, The slip ring of the deep soil disturbance control device suitable for confined spaces gradually slides downward under the tension of the bladder, causing the sleeve and the pad to jointly squeeze the rubber ring, thus achieving the grout-stopping effect.

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