A grouting device and method for repairing a thawed soil highway settlement section

Abstract

This invention discloses a grouting device and method for repairing subsidence sections of frozen soil highways, belonging to the field of roadbed repair technology. It includes an inlet pipe installed inside a grouting hole and a fixed seat detachably connected to the inlet pipe and installed at the opening of the grouting hole. The inlet pipe has an input hole connected to a grouting mechanism. The key feature is that a rubber tube is installed near the fixed seat on the inlet pipe, and the rubber tube has an expansion space communicating with the interior of the inlet pipe. An elastic element extending into the inlet pipe is installed on the fixed seat. A compression plate is fixedly connected to one end of the elastic element located inside the inlet pipe. A sealing plate is slidably installed inside the inlet pipe. During grouting, the grout drives the sealing plate to slide closer to the compression plate, compressing the elastic element. This invention ensures the density of the grout during the grouting process and improves the penetration effect of the grout into the base layer on the side of the hole.

Description

Technical Field

[0001] This invention belongs to the field of roadbed repair technology, specifically relating to a grouting device and method for repairing subsidence sections of frozen soil highways. Background Technology

[0002] Permafrost has the disadvantage of poor thermal stability and is very sensitive to changes in external temperature. Therefore, thaw settlement and frost heave of permafrost subgrade caused by temperature changes, which in turn lead to uneven settlement and even cracking of highways, are the main engineering problems faced by expressways.

[0003] Currently, polymer grouting technology is commonly used to quickly grout and treat roadbeds in subsidence sections of highways. This technology involves injecting non-aqueous reactive two-component polymer materials into the foundation. The two materials react, expand, and solidify rapidly after mixing, thus reinforcing and raising the foundation or filling voids. In the grouting process, grouting is typically carried out by drilling holes and then lowering grouting pipes.

[0004] Chinese patent CN 112267848 B discloses a grouting method and device that automatically seals holes and prevents blockage of grouting pump pipelines. It utilizes multiple perforated pipes and rubber hoses attached to these pipes for grouting and sealing. As the grouting volume increases and the grouting pressure rises to a set value, grout continuously flows through the perforated pipes into the rubber hoses, causing the hoses to expand. When the hoses expand to a tight fit with the orifice pipe, a solidified grout layer forms between them, completing the automatic sealing. However, this grouting device injects grout into the hole through an external pressurization mechanism, and the hole is sealed by the grout itself. The grout's own pressure allows it to penetrate roadbed cracks, resulting in poor penetration. To improve penetration, the pressure of the grouting pump (i.e., the external pressurization mechanism) is typically adjusted. However, excessive pressure can damage the soil, while insufficient pressure leads to poor penetration.

[0005] Therefore, it is necessary to propose a grouting device and method for repairing subsidence sections of frozen soil highways in order to solve the above problems. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a grouting device and method for repairing subsidence sections of frozen soil highways, which solves the problem that the existing technology of applying pressure grouting by external pressurization mechanism alone cannot match the permeability effect.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] This invention provides a grouting device for repairing subsidence sections of frozen soil highways, comprising an inlet pipe installed in a grouting hole and a fixed seat detachably connected to the inlet pipe and installed at the opening of the grouting hole. The inlet pipe has an input hole connected to a grouting mechanism. A rubber tube is installed near the fixed seat on the inlet pipe, and an expansion space communicating with the inside of the inlet pipe is provided inside the rubber tube. An elastic element that can extend into the inlet pipe is installed on the fixed seat. A compression plate is fixedly connected to one end of the elastic element located inside the inlet pipe. A sealing plate is slidably installed inside the inlet pipe. During grouting, the grout drives the sealing plate to slide closer to the compression plate to compress the elastic element.

[0009] Furthermore, the fixed base is provided with a threaded hole, and a threaded plate that is fixedly connected to the elastic element is threaded in the threaded hole. Rotating the threaded plate can cause the elastic element to move along the axial direction of the threaded hole to adjust the distance of the extrusion plate extending into the inlet tube.

[0010] Furthermore, the distance by which the extrusion plate extends into the manhole tube is adjusted according to the following preset algorithm:

[0011]

[0012] in, The grouting pressure applied to the grouting mechanism, This refers to the pressure at which the injected slurry diffuses to a radius R. The elastic modulus of the elastic element. This represents the maximum displacement of the extrusion plate. The dynamic viscosity of the slurry. Let be the permeability coefficient of the slurry. For grouting time, This refers to the grouting pressure head height. The radius of the grouting hole is... The effective void filling coefficient, This is the ratio of the slurry viscosity to the water viscosity. The porosity of the slurry. This refers to the distance between the observation hole and the grouting hole during grouting. The permeability coefficient of the roadbed rock layer. The thickness of the rock layer injected in one operation.

[0013] Furthermore, the sealing plate is provided with a sliding groove, and a slider is connected to the sliding groove by a spring. The slider is slidably connected in the sliding groove. The expansion space is connected to the inside of the inlet pipe through a snap-fit ​​hole. When the sealing plate moves to the snap-fit ​​hole, the slider can slide out of the sliding groove and snap into the snap-fit ​​hole under the action of the spring.

[0014] Furthermore, a switch connected to the grouting mechanism is installed in the snap-fit ​​hole. When the slider slides into the snap-fit ​​hole, the switch can be changed from the open state to the closed state to shut down the grouting mechanism.

[0015] Furthermore, the inner wall of the manhole pipe is provided with a limiting groove along the axis of the manhole pipe, and the sealing plate is provided with a limiting block that cooperates with the limiting groove. The limiting block cooperates with the limiting groove to limit the sliding of the sealing plate.

[0016] A grouting method for a grouting device used for repairing subsidence sections of frozen soil highways includes the following steps:

[0017] S1: Determine the soil structure of the roadbed settlement section, and adjust the distance of the extrusion plate extending into the manhole pipe according to the soil structure and a preset algorithm. The preset algorithm is as follows:

[0018]

[0019] in, The grouting pressure applied to the grouting mechanism, This refers to the pressure at which the injected slurry diffuses to a radius R. The elastic modulus of the elastic element. This represents the maximum displacement of the extrusion plate. The dynamic viscosity of the slurry. Let be the permeability coefficient of the slurry. For grouting time, This refers to the grouting pressure head height. The radius of the grouting hole is... The effective void filling coefficient, This is the ratio of the slurry viscosity to the water viscosity. The porosity of the slurry. This refers to the distance between the observation hole and the grouting hole during grouting. The permeability coefficient of the roadbed rock layer. The thickness of the rock layer injected in one operation;

[0020] S2: After venting the gas in the expansion space, adjust the sealing plate to the end of the inlet tube away from the fixed seat, and install the fixed seat and the inlet tube so that when the elastic element is in normal condition, the extrusion plate is located inside the inlet tube.

[0021] S3; Install the manhole pipe inside the grouting hole and fix the fixing seat to the edge of the grouting hole opening;

[0022] S4: After preparing the grout using low-heat-exothermic polyurethane material, start the grouting mechanism to perform grouting;

[0023] S5: After grouting is completed, remove the fixing seat.

[0024] The beneficial effects of this invention are as follows:

[0025] This invention uses a compression plate and an elastic element to compress the grout. During grouting, the soil's own compressive strength allows the grout to move, driving the compression plate and ensuring grout density. This improves the grout's penetration into the substrate around the hole, ensuring optimal penetration. It solves the problem of low grout density and poor penetration during conventional grouting, where the hole needs to be filled completely before external pressure is applied, resulting in poor penetration. During grout filling, the elastic element contracts smoothly as the amount of grout increases, gradually increasing its elastic potential energy and ensuring stable penetration. Furthermore, the moving sealing plate introduces constant-pressure gas from the inlet pipe into the expansion space, automatically sealing the grouting hole. A fixed base at the hole opening ensures stable elastic potential energy and prevents displacement at the end connected to the base during compression.

[0026] Other advantages, objectives, and features of the invention will be set forth in the following description and will be apparent to those skilled in the art in some respects, or may be learned by practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0027] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the following figures are provided for illustration:

[0028] Figure 1 This is a cross-sectional view of the grouting device according to an embodiment of the present invention;

[0029] Figure 2 This is a cross-sectional view of the manhole tube according to an embodiment of the present invention;

[0030] Figure 3 This is a structural diagram of the manhole tube according to an embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram of the installation of the grouting device according to an embodiment of the present invention;

[0032] Figure 5 This is a flowchart of an embodiment of the present invention.

[0033] The following markings are shown in the attached diagram: 1. Manhole pipe; 101. Input hole; 102. Limiting groove; 2. Fixing base; 201. Threaded hole; 202. Threaded plate; 3. Rubber tube; 4. Expansion space; 5. Grouting hole; 6. Elastic element; 7. Extrusion plate; 8. Sealing plate; 801. Slide groove; 802. Spring; 803. Sliding block; 804. Snap-fit ​​hole; 805. Limiting block. Detailed Implementation

[0034] like Figures 1-5 As shown, the present invention provides a grouting device for repairing subsidence sections of frozen soil highways, comprising: an inlet pipe 1, which is installed in a grouting hole 5, an input hole 101 on the inlet pipe 1, a grouting mechanism for injecting grout into the input hole 101 connected to the inlet pipe 1, a fixing seat 2 connected to the inlet pipe 1, the fixing seat 2 being fixedly installed at the hole opening, a rubber tube 3 installed near the fixing seat 2 on the inlet pipe 1, an expansion space 4 provided inside the rubber tube 3, the expansion space 4 communicating with the interior of the inlet pipe 1, an elastic element 6 installed on the fixing seat 2, a compression plate 7 fixedly connected to the end of the elastic element 6 away from the fixing seat 2, when the elastic element 6 does not have elastic potential energy, the compression plate 7 extends into the inlet pipe 1, a sealing plate 8 is slidably connected inside the inlet pipe 1, during grouting, the grout drives the sealing plate 8 to slide towards the compression plate 7 to compress the elastic element 6.

[0035] The working principle of the above technical solution is as follows: Figure 1 Before grouting, the manhole pipe 1 is installed inside the grouting hole 5, and the fixing seat 2 is installed at the opening of the grouting hole 5. During grouting, the grout is injected into the grouting hole 5 from the input hole 101 through the grouting mechanism. As the grout fills, when the grout is close to the sealing plate 8, the grouting continues and drives the sealing plate 8 to move. When the sealing plate 8 moves to be close to the extrusion plate 7, it drives the extrusion plate 7 to move, thereby compressing the elastic element 6. The pressure inside the hole and the elastic potential energy of the elastic element 6 during the continued grouting create pressure on the grout inside the hole, so that the grout can withstand greater pressure during the grouting process, thereby improving the penetration effect of the grout into the base layer on the side of the hole. During the movement of the sealing plate 8, due to the constant pressure inside the manhole pipe 1, the movement of the sealing plate 8 drives the gas inside the manhole pipe 1 to enter the expansion space 4 inside the rubber tube 3, thereby expanding the rubber tube 3 and sealing the grouting hole 5.

[0036] The beneficial effects of the above technical solution are as follows: By setting the extrusion plate 7 and the elastic element 6 to extrude the grout, the soil's own compressive strength allows the grout to drive the extrusion plate 7 to move during the grouting process, ensuring the density of the grout and improving its penetration effect on the hole-side base layer, thus ensuring compatibility with the penetration effect; it solves the problem that in conventional grouting treatment, the grout needs to be filled into the hole before the grouting is completed, and then the grout is penetrated by the pressure of the external pressurization mechanism, resulting in low grout density and poor penetration effect during the grouting process; during the grout filling process, the elastic element 6 contracts smoothly as the amount of grout increases, thereby gradually and steadily increasing the elastic potential energy, ensuring the stability of the penetration effect; and the movement of the sealing plate 8 drives the constant pressure gas in the inlet pipe 1 into the expansion space 4 to automatically seal the grouting hole 5; by setting the fixing seat 2 to be fixed at the opening of the grouting hole 5, the elastic potential energy of the elastic element 6 is kept stable, and displacement of the end connected to the fixing seat 2 is avoided when the elastic element 6 is compressed.

[0037] In one embodiment of the present invention, the periphery of the sealing plate 8 is provided with a plurality of sliding grooves 801 circumferentially in the direction of the axis of the sealing plate 8. A slider 803 is connected to the sliding groove 801 by a spring 802. The slider 803 is slidably connected in the sliding groove 801. The expansion space 4 is connected to the inside of the inlet pipe 1 through a snap-fit ​​hole 804. When the sealing plate 8 moves to the snap-fit ​​hole 804, the slider 803 slides out of the sliding groove 801 and snaps into the snap-fit ​​hole 804 under the action of the spring 802.

[0038] The working principle of the above technical solution is as follows: Figure 1 Before grouting, the slider 803 is limited by the inner wall of the inlet pipe 1 and is located in the groove 801. At this time, the spring 802 is in a compressed state. During grouting, the grout drives the sealing plate 8 to slide to the snap-fit ​​hole 804. Then, the slider 803 loses the limitation of the inner wall of the inlet pipe 1. Under the action of the spring 802, the slider 803 slides into the snap-fit ​​hole 804. At this time, the grouting is completed and the fixing seat 2 is disassembled.

[0039] The beneficial effects of the above technical solution are as follows: the slider 803 is engaged with the snap-fit ​​hole 804, which facilitates the disassembly of the fixing seat 2; and after the fixing seat 2 is disassembled, the inlet pipe 1 is in a closed state, so as to seal the grout in the grouting hole 5.

[0040] In one embodiment of the present invention, a switch is installed in the snap-fit ​​hole 804, the switch is connected to the grouting mechanism, and the slider 803 can slide into the snap-fit ​​hole 804 to put the switch in the closed state to close the grouting mechanism.

[0041] The working principle of the above technical solution is as follows: Figure 1During grouting, the switch is in the open state. After the slider 803 moves into the snap-fit ​​hole 804, the slider 803 slides and drives the switch to change from the open state to the closed state, thereby closing the grouting mechanism and stopping the grouting.

[0042] The beneficial effects of the above technical solution are as follows: by setting a switch, when the slider 803 is engaged with the locking hole 804, the grouting mechanism is automatically shut off, which avoids the continuous injection of grout causing excessive pressure in the grouting hole 5, and prevents the grout penetration pressure from causing damage or deformation to the soil or the manhole pipe 1.

[0043] In one embodiment of the present invention, the fixed base 2 is provided with a threaded hole 201, and a threaded plate 202 is threadedly connected to the threaded hole 201. The threaded plate 202 is fixedly connected to the elastic member 6.

[0044] The working principle of the above technical solution is as follows: Rotate the threaded plate 202 so that the threaded plate 202 can drive the elastic element 6 to move along the axial direction of the threaded hole 201, thereby adjusting the distance of the extrusion plate 7 extending into the inlet tube 1, thereby changing the elastic potential energy that the elastic element 6 can accumulate during the slurry filling process.

[0045] The beneficial effects of the above technical solution are as follows: By setting the rotating threaded plate 202, the distance of the extrusion plate 7 extending into the inlet pipe 1 can be adjusted, thereby changing the elastic potential energy that the elastic element 6 can accumulate during the grout filling process. This changes the pressure on the grout from the extrusion plate 7 during the grouting process. Adjusting the position of the threaded plate 202 according to the soil structure of the roadbed settlement section ensures the penetration effect of the grout into the soil under pressure. It avoids that the elastic potential energy of the elastic element 6 on the extrusion plate 7 is too large, resulting in excessive penetration force and damage to the soil, and avoids that the elastic potential energy of the elastic element 6 on the extrusion plate 7 is too small, resulting in insufficient penetration force and inadequate soil repair.

[0046] In one embodiment of the present invention, the distance by which the extrusion plate 7 extends into the inlet tube 1 is adjusted according to the following preset algorithm:

[0047]

[0048] in, The grouting pressure applied to the grouting mechanism, This refers to the pressure at which the injected slurry diffuses to a radius R. The elastic modulus of the elastic element. This represents the maximum displacement of the extrusion plate 7. The dynamic viscosity of the slurry. Let be the permeability coefficient of the slurry. For grouting time, This refers to the grouting pressure head height. The radius of grouting hole 5 is... The effective void filling coefficient, This is the ratio of the slurry viscosity to the water viscosity. The porosity of the slurry. The distance between the observation hole and the grouting hole 5 during grouting. The permeability coefficient of the roadbed rock layer. The thickness of the rock layer injected in one operation.

[0049] The working principle and beneficial effects of the above technical solution are as follows: By judging the soil structure and the installation position of the manhole pipe 1, the judgment coefficients are first determined, including... , , , Based on the above formula, the maximum displacement of the extrusion plate 7 can be calculated without damaging the soil and rock structure and while ensuring permeability. The value is adjusted by rotating the threaded plate 202 to adjust the distance of the extrusion plate 7 extending into the inlet pipe 1, ensuring permeability and preventing soil damage. The calculation is performed using the above formula, taking into account the correlation coefficients of the soil structure, the correlation constants of the grouting hole 5, the correlation coefficients of the materials used in the grout, and the elastic coefficient of the elastic element 6, which improves the accuracy of adjusting the extrusion plate 7 and makes the permeability effect and soil safety better.

[0050] In one embodiment of the present invention, a limiting groove 102 is provided on the inner wall of the inlet pipe 1 along the axial direction of the inlet pipe 1, and a limiting block 805 is provided on the sealing plate 8 to cooperate with the limiting groove 102. The limiting block 805 cooperates with the limiting groove 102 to limit the sliding of the sealing plate 8.

[0051] The working principle and beneficial effects of the above technical solution are as follows: By setting the limiting groove 102 and the limiting block 805 together, the sealing plate 8 slides more smoothly under the pressure of the slurry filling process, avoiding the deflection of the sealing plate 8 when sliding, which would cause uneven force on the elastic element 6 and tilting, thus affecting the squeezing effect of the extrusion plate 7 on the slurry; and preventing the slurry from being input into the space where the elastic element 6 is located, thus affecting the disassembly of the fixing seat 2.

[0052] A grouting method for repairing subsidence sections of highways in frozen soil includes the following steps:

[0053] S1: Determine the soil structure of the roadbed settlement section, and adjust the distance of the extrusion plate 7 extending into the manhole pipe 1 according to the soil structure and a preset algorithm. The preset algorithm is as follows:

[0054]

[0055] in, The grouting pressure applied to the grouting mechanism, This refers to the pressure at which the injected slurry diffuses to a radius R. The elastic modulus of the elastic element. This represents the maximum displacement of the extrusion plate 7. The dynamic viscosity of the slurry. Let be the permeability coefficient of the slurry. For grouting time, This refers to the grouting pressure head height. The radius of grouting hole 5 is... The effective void filling coefficient, This is the ratio of the slurry viscosity to the water viscosity. The porosity of the slurry. The distance between the observation hole and the grouting hole 5 during grouting. The permeability coefficient of the roadbed rock layer. The thickness of the rock layer injected in one operation;

[0056] S2: After the gas in the expansion space 4 is discharged, the sealing plate 8 is adjusted to the end of the inlet tube 1 away from the fixed seat 2, and the fixed seat 2 is installed and connected to the inlet tube 1 so that when the elastic element 6 is in the normal state, the extrusion plate 7 is located inside the inlet tube 1.

[0057] S3; Install the manhole pipe 1 inside the grouting hole 5, and fix the fixing seat 2 to the edge of the opening of the grouting hole 5;

[0058] S4: After preparing the grout using low-heat-exothermic polyurethane material, start the grouting mechanism to perform grouting;

[0059] S5: After grouting is completed, remove the fixing seat 2.

[0060] The working principle and beneficial effects of the above technical solution are as follows: Step S1 sets a preset algorithm to adjust the distance of the extrusion plate 7 extending into the manhole pipe 1, ensuring that the elastic potential energy accumulated by the elastic element 6 matches the bearing pressure of the soil structure, avoiding excessive elastic potential energy that damages the soil structure or insufficient elastic potential energy that affects the permeability effect; Step S2 discharges the gas in the expansion space 4 and adjusts the original position of the sealing plate 8 before installing the fixing seat and the manhole pipe 1, ensuring the constant pressure state in the manhole pipe 1 during grouting and the maximum deformation that the rubber tube 3 can expand, avoiding excessive expansion of the rubber tube 3 that damages the opening of the grouting hole 5 or insufficient expansion of the rubber tube 3 that affects the sealing effect of the rubber tube 3 on the grouting hole 5.

[0061] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A grouting device for repairing subsidence sections of frozen soil highways, comprising an inlet pipe installed in a grouting hole and a fixing seat detachably connected to the inlet pipe and installed at the opening of the grouting hole, wherein the inlet pipe is provided with an input hole connected to a grouting mechanism, characterized in that: A rubber tube is installed near the fixing seat of the manhole pipe. The rubber tube contains an expansion space communicating with the interior of the manhole pipe. An elastic element extending into the manhole pipe is installed on the fixing seat. A compression plate is fixedly connected to one end of the elastic element inside the manhole pipe. A sealing plate is slidably installed inside the manhole pipe. During grouting, the grout causes the sealing plate to slide closer to the compression plate, compressing the elastic element. During the movement of the sealing plate, due to the constant pressure inside the manhole pipe, the movement of the sealing plate causes gas inside the manhole pipe to enter the expansion space inside the rubber tube, causing the rubber tube to expand and thus sealing the grouting hole. The fixing seat has an internal thread. A threaded plate is connected to an elastic element. Rotating the threaded plate allows it to move an extrusion plate to adjust the distance the extrusion plate extends into the inlet pipe. The sealing plate has a groove, and a slider is connected to the groove via a spring. The slider is slidably connected within the groove. The expansion space communicates with the inside of the inlet pipe through a snap-fit ​​hole. When the sealing plate moves to the snap-fit ​​hole, the slider slides out of the groove and snaps into the snap-fit ​​hole under the action of the spring. A switch connected to the grouting mechanism is installed in the snap-fit ​​hole. When the slider slides into the snap-fit ​​hole, the switch changes from an open state to a closed state to shut down the grouting mechanism.

2. The grouting device for repairing subsidence sections of frozen soil highways according to claim 1, characterized in that: The inner wall of the inlet pipe is provided with a limiting groove along the axis of the inlet pipe, and the sealing plate is provided with a limiting block that cooperates with the limiting groove. The limiting block cooperates with the limiting groove to limit the sliding of the sealing plate.

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