Directional grouting method and directional grouting pipe

Abstract

The application discloses a directional grouting method and a directional grouting pipe, and relates to the field of geotechnical engineering reinforcement. The directional grouting pipe comprises a sleeve, a grouting mechanism and a reaming mechanism. The grouting mechanism is slidingly installed in the sleeve. The upper end of the reaming mechanism is hingedly connected to the lower end of the sleeve, and the lower end of the reaming mechanism is hingedly connected to the lower end of the grouting mechanism. The reaming mechanism is aligned with a preset splitting direction, and the directional grouting pipe is lowered to a preset depth of the splitting grouting. The grouting mechanism is made to slide upwards relative to the sleeve, so that the reaming mechanism is expanded in the radial direction. Then, the directional grouting pipe is made to move, so that a preset crack parallel to the directional grouting pipe or a preset crack perpendicular to the directional grouting pipe is formed. The preset crack is formed by controlling the direction of reaming, the splitting grouting is induced to crack in a direction, and the extension direction of the grout vein of the splitting grouting is controlled, so that the quality of the splitting grouting is improved.

Description

Technical Field

[0001] This invention relates to the field of geotechnical engineering reinforcement, and in particular to a directional grouting method and a directional grouting pipe. Background Technology

[0002] Fracturing grouting employs a high-pressure grouting process, injecting cement or chemical grout into the soil layer to improve its properties. During grouting, the grout exiting the grouting pipe applies additional compressive stress to the surrounding soil, causing shear cracks. The grout then splits along these cracks from areas of low soil strength to areas of high strength, creating grout veins that form a network or framework for reinforcing the soil. Because the grout does not mix uniformly with soil particles during its penetration, but exists as two separate phases, the direction of grout vein expansion inevitably affects the reinforcement effect of fracturing grouting. Furthermore, the heterogeneity of the soil means that the initiation direction of current fracturing grouting is random, which inevitably has a negative impact on the reinforcement effect. Summary of the Invention

[0003] To address the above technical problems, this invention provides a directional grouting method and a directional grouting pipe, which can control the grout vein expansion direction of fracturing grouting and improve the quality of fracturing grouting.

[0004] To achieve the above objectives, the present invention provides the following solution:

[0005] This invention provides a directional grouting method using a directional grouting pipe. The directional grouting pipe includes a sleeve, a grouting mechanism, and a hole-expanding mechanism. The grouting mechanism is slidably installed in the sleeve. The upper end of the hole-expanding mechanism is hinged to the lower end of the sleeve, and the lower end of the hole-expanding mechanism is hinged to the lower end of the grouting mechanism.

[0006] The method includes the following steps:

[0007] Step 1: Use drilling tools to drill holes to the desired depth in the strata that need to be reinforced;

[0008] Step 2: Pre-determine the splitting direction and the depth of splitting grouting according to project requirements;

[0009] Step 3: Align the hole enlarging mechanism with the preset splitting direction and lower the directional grouting pipe to the preset splitting grouting depth;

[0010] Step 4: The grouting mechanism slides upward relative to the sleeve, thereby causing the hole expansion mechanism to expand radially, and then the directional grouting pipe moves, thereby forming a preset crack parallel to the directional grouting pipe or a preset crack perpendicular to the directional grouting pipe.

[0011] Step 5: Adjust the grouting parameters according to the design requirements and start the grouting process.

[0012] Optionally, in step four, after the hole-expanding mechanism expands radially, the directional grouting pipe is lifted upward along the axial direction of the directional grouting pipe, allowing the expanded hole-expanding mechanism to cut the soil and thus form a preset crack parallel to the directional grouting pipe.

[0013] Optionally, in step four, after the hole-expanding mechanism expands radially, the directional grouting pipe is rotated, allowing the expanded hole-expanding mechanism to cut the soil, thereby forming a preset crack perpendicular to the directional grouting pipe.

[0014] The present invention also provides a directional grouting pipe, including a sleeve, a grouting mechanism and a hole-expanding mechanism. The grouting mechanism is slidably installed in the sleeve. The upper end of the hole-expanding mechanism is hinged to the lower end of the sleeve. The lower end of the hole-expanding mechanism is hinged to the outer wall of the lower end of the grouting mechanism. When the grouting mechanism slides relative to the sleeve, the hole-expanding mechanism can expand radially.

[0015] Optionally, the hole-expanding mechanism includes two symmetrically arranged hole-expanding components. Each hole-expanding component includes a first hole-expanding plate and a second hole-expanding plate. The upper end of the first hole-expanding plate is hinged to the lower end of the sleeve, and the upper end of the second hole-expanding plate is hinged to the lower end of the first hole-expanding plate. The lower end of the second hole-expanding plate is hinged to the outer wall of the lower end of the grouting mechanism. A hollow cavity is formed inside the first hole-expanding plate, and a plurality of grout outlet holes are provided on the side wall of the first hole-expanding plate. The lower end of the grouting mechanism communicates with the hollow cavity.

[0016] Optionally, the grouting mechanism includes a rod and two grouting hoses. The rod is slidably installed in the sleeve. Two first axial strip holes are symmetrically arranged on the side wall of the rod. Each grouting hose extends from the top of the rod into the rod and passes through one of the first axial strip holes to the outside of the rod, communicating with the hollow cavity of a first expanding plate. The lower end of the second expanding plate is hinged to the outer wall of the lower end of the rod.

[0017] Optionally, a limiting mechanism is provided on the outer wall of the rod body to restrict the relative circumferential movement of the rod body and the sleeve. The limiting mechanism includes a limiting slider provided on the outer wall of the rod body, and a second axial strip hole is provided on the side wall of the sleeve for the limiting slider to slide along the axial direction of the sleeve.

[0018] Optionally, two limiting sliders are provided, and the two limiting sliders are symmetrically arranged on the outer wall of the rod body, and two second axial strip holes are symmetrically arranged on the side wall of the sleeve.

[0019] Optionally, it also includes a rotating mechanism, wherein an external thread is provided on the outer wall of the upper end of the rod, the rotating mechanism includes a rotating handle and a nut disposed on the upper part of the rotating handle, the rotating handle is disposed on the outside of the upper end of the rod, and the nut is threadedly sleeved on the outside of the upper end of the rod.

[0020] Optionally, the rotating handle includes an annular plate and two handle rods respectively disposed at both ends of the annular plate, the nut is fixed to the upper part of the annular plate, and the annular plate is sleeved on the outside of the upper end of the handle.

[0021] The present invention achieves the following technical effects compared to the prior art:

[0022] The directional grouting pipe of the present invention includes a sleeve, a grouting mechanism, and a borehole expansion mechanism. The grouting mechanism is slidably installed in the sleeve, the upper end of the borehole expansion mechanism is hinged to the lower end of the sleeve, and the lower end of the borehole expansion mechanism is hinged to the lower end of the grouting mechanism. The borehole expansion mechanism is aligned with a preset splitting direction, and the directional grouting pipe is lowered to a preset splitting grouting depth. This causes the grouting mechanism to slide upward relative to the sleeve, thereby causing the borehole expansion mechanism to expand radially. This then causes the directional grouting pipe to move, thereby forming a preset crack parallel to or perpendicular to the directional grouting pipe. By controlling the direction of borehole expansion to form a preset crack, the initiation direction of splitting grouting is induced, thus controlling the grout vein expansion direction of splitting grouting, improving the quality of splitting grouting, and offering simple operation and low cost. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 The front view of the reaming mechanism of the directional grouting pipe provided by the present invention when it is not open;

[0025] Figure 2 This is a front view of the reaming mechanism of the directional grouting pipe provided by the present invention when it is open.

[0026] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0027] Figure 4 A cross-sectional view of the sleeve of the directional grouting pipe provided by the present invention, where the second axial strip hole is provided;

[0028] Figure 5 This is a top view of the directional grouting pipe provided by the present invention.

[0029] Explanation of reference numerals in the attached drawings: 100, directional grouting pipe; 1, sleeve; 2, rod; 3, grouting hose; 4, external thread; 5, first axial strip hole; 6, first expanding plate; 7, second expanding plate; 8, grout outlet hole; 9, limiting slider; 10, second axial strip hole; 11, annular plate; 12, handle rod; 13, nut. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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.

[0031] The purpose of this invention is to provide a directional grouting method and a directional grouting pipe, which can control the grout vein expansion direction of fracturing grouting and improve the quality of fracturing grouting.

[0032] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] like Figures 1-5 As shown, this embodiment provides a directional grouting method, which uses a directional grouting pipe 100. The directional grouting pipe 100 includes a sleeve 1, a grouting mechanism and a hole-expanding mechanism. The grouting mechanism is slidably installed in the sleeve 1. The upper end of the hole-expanding mechanism is hinged to the lower end of the sleeve 1, and the lower end of the hole-expanding mechanism is hinged to the lower end of the grouting mechanism.

[0034] The method includes the following steps:

[0035] Step 1: Use drilling tools to drill holes to the desired depth in the strata that need to be reinforced;

[0036] Step 2: Pre-determine the splitting direction and the depth of splitting grouting according to project requirements;

[0037] Step 3: Align the hole enlarging mechanism with the preset splitting direction and lower the directional grouting pipe 100 to the preset splitting grouting depth;

[0038] Step 4: The grouting mechanism slides upward relative to the sleeve 1, thereby causing the hole expansion mechanism to expand radially, and then the directional grouting pipe 100 moves, thereby forming a preset crack parallel to the directional grouting pipe 100 or a preset crack perpendicular to the directional grouting pipe 100.

[0039] Step 5: Adjust the grouting parameters according to the design requirements and start the grouting process.

[0040] Before grouting, the on-site geological conditions are investigated, specifically the soil condition at the grouting location is examined. On-site samples are taken for testing to determine the grouting design parameters. These tests include soil mechanical property testing and soil permeability parameter testing.

[0041] The grouting design involves determining the grout mix ratio, grouting pressure, grout outlet location and layout method, grouting range, and splitting grouting direction based on the soil parameters obtained from the on-site geological conditions investigation.

[0042] Then, start the grouting pump to begin grouting. Grouting can be done in one continuous grouting or in stages. Generally, for a single grouting borehole, to ensure the quality of grouting, grouting should be carried out in stages. Depending on the direction of the grouting pipe, there are three types of staged grouting: staged downward (advancing) grouting, staged upward (retreating) grouting, and mixed grouting.

[0043] Finally, the grouting effect is checked. Specifically, by comparing and monitoring changes in the permeability, strength, and water conductivity of the strata before and after grouting, and using various methods to evaluate the grouting effect, it is possible to accurately and comprehensively determine whether the anti-seepage reinforcement effect of the grouting project has met the expected requirements. Examples include comparing changes in the permeability coefficient of the strata before and after grouting, comparing changes in the standard penetration value (N) of the strata before and after grouting, testing changes in the physical parameters of soil samples taken before and after grouting, and monitoring changes in the resistivity of the strata before and after grouting.

[0044] Specifically, in step four, after the borehole expansion mechanism expands radially, it lifts the directional grouting pipe 100 upwards along its axial direction, allowing the expanded borehole mechanism to cut the soil and thus form a pre-set crack parallel to the directional grouting pipe 100. This pre-set crack is rectangular; the direction of the borehole expansion mechanism is the direction of the pre-set crack; the distance the borehole expansion mechanism opens is the length of the pre-set crack; the distance the directional grouting pipe 100 is lifted is the height of the pre-set crack; and the thickness of the borehole expansion mechanism is the width of the pre-set crack.

[0045] Specifically, in step four, after the borehole expansion mechanism expands radially, the directional grouting pipe 100 is rotated, allowing the expanded borehole mechanism to cut the soil, thereby forming a pre-set crack perpendicular to the directional grouting pipe 100. This pre-set crack is a disc-shaped crack. The distance the borehole expansion mechanism extends is the diameter of the pre-set crack, and the thickness of the borehole expansion mechanism is the width of the pre-set crack. The direction of the pre-set crack is perpendicular to the directional grouting pipe 100, and the center of the pre-set crack is located at the intersection of the centerline of the expanded borehole mechanism and the central axis of the directional grouting pipe 100.

[0046] In this embodiment, the direction of the borehole expansion is controlled to form a preset crack, which induces the crack initiation direction of the split grouting, thereby controlling the expansion direction of the grout vein and improving the quality of the split grouting. At the same time, the method is simple to operate, low in cost, and the directional grouting pipe 100 can be customized according to specific engineering needs, which ensures the scientific nature of the split grouting. It can be applied to the reinforcement of soft soil layers in urban underground engineering construction to improve the stability and safety of soft soil layers.

[0047] This embodiment also provides a directional grouting pipe 100, including a sleeve 1, a grouting mechanism and a hole-expanding mechanism. The grouting mechanism is slidably installed in the sleeve 1, and both the upper and lower ends of the grouting mechanism extend to the outside relative to the sleeve 1. The upper end of the hole-expanding mechanism is hinged to the lower end of the sleeve 1, and the lower end of the hole-expanding mechanism is hinged to the outer wall of the lower end of the grouting mechanism. When the grouting mechanism slides relative to the sleeve 1, the hole-expanding mechanism can expand radially.

[0048] The reaming mechanism includes two symmetrically arranged reaming components. Each reaming component includes a first reaming plate 6 and a second reaming plate 7. The upper end of the first reaming plate 6 is hinged to the lower end of the sleeve 1, and the upper end of the second reaming plate 7 is hinged to the lower end of the first reaming plate 6. The lower end of the second reaming plate 7 is hinged to the outer wall of the lower end of the grouting mechanism. The interior of the first reaming plate 6 forms a hollow cavity, and multiple grout outlet holes 8 are provided on the side wall of the first reaming plate 6. The lower end of the grouting mechanism is connected to the hollow cavity, and the grout flowing out of the grouting mechanism can enter the hollow cavity of the first reaming plate 6 and then flow out through the grout outlet holes 8.

[0049] The grouting mechanism includes a rod 2 and two grouting hoses 3. The rod 2 is slidably installed in a sleeve 1, with both its upper and lower ends extending to the outside relative to the sleeve 1. In this embodiment, the rod 2 has a hollow structure, with an open top and a conical closed bottom. Two first axial slotted holes 5 are symmetrically arranged on the side wall of the rod 2. Each grouting hose 3 extends from the top of the rod 2 into the rod 2 and passes through one of the first axial slotted holes 5 to the outside of the rod 2, communicating with the hollow cavity of a first expanding plate 6. The lower end of the grouting hose 3 is connected to the upper end of the first expanding plate 6. Grout is introduced into the grouting hose 3, and the grout flows out through the grout outlet hole 8 via the hollow cavity. The lower end of the second expanding plate 7 is hinged to the outer wall of the lower end of the rod 2. By providing the first axial slotted holes 5, the grouting hoses 3 have a certain amount of room to move when the rod 2 slides relative to the sleeve 1.

[0050] A limiting mechanism is provided on the outer wall of the rod 2 to restrict the relative circumferential movement between the rod 2 and the sleeve 1, so that no relative circumferential movement occurs between the rod 2 and the sleeve 1. The limiting mechanism includes a limiting slider 9 provided on the outer wall of the rod 2, and a second axial slot 10 provided on the side wall of the sleeve 1 for the limiting slider 9 to slide along the axial direction of the sleeve 1. By cooperating with the limiting slider 9 and the second axial slot 10, the rod 2 can slide relative to the sleeve 1 without rotating relative to the sleeve 1.

[0051] Two limit sliders 9 are provided, and the two limit sliders 9 are symmetrically arranged on the outer wall of the rod body 2. Two second axial strip holes 10 are symmetrically arranged on the side wall of the sleeve 1, and each limit slider 9 is slidably installed in one of the second axial strip holes 10.

[0052] This embodiment also includes a rotating mechanism. An external thread 4 is provided on the outer wall of the upper end of the rod 2. The rotating mechanism is threaded onto the outside of the upper end of the rod 2. The rotating mechanism rotates against the top surface of the sleeve 1, that is, the rotating mechanism rotates in place relative to the sleeve 1, thereby causing the rod 2 to move upward along the axis of the sleeve 1.

[0053] The rotating mechanism includes a rotating handle and a nut 13 disposed on the upper part of the rotating handle. The rotating handle is disposed on the outside of the upper end of the rod 2, and the nut 13 is threadedly sleeved on the outside of the upper end of the rod 2.

[0054] The rotating handle includes an annular plate 11 and two handle rods 12 respectively disposed at both ends of the annular plate 11. A nut 13 is fixed to the upper part of the annular plate 11, and the annular plate 11 is sleeved on the outside of the upper end of the rod body 2. When it is necessary to open the hole-expanding assembly, the annular plate 11 is pressed against the top surface of the sleeve 1, and the annular plate 11 and the nut 13 are rotated by rotating the handle rods 12. The nut 13 rotates in place relative to the sleeve 1, thereby causing the rod body 2 to slide upward along the axial direction of the sleeve 1.

[0055] In this specific embodiment, the outer diameter of the rod 2 is smaller than the inner diameter of the sleeve 1. Specifically, the length of the rod 2 is 1000mm and the outer diameter is 45mm; the outer diameter of the sleeve 1 is 50mm, the inner diameter is 46mm, and the diameter of the slurry outlet 8 is 5mm.

[0056] The length of both the first expanding plate 6 and the second expanding plate 7 is 100mm. The opening angle α of the first expanding plate 6 is the angle between the first expanding plate 6 and the axis of the rod 2, and α is 0 to 90°. Specifically, by controlling the number of rotations of the rotating mechanism, the sliding distance of the rod 2 relative to the sleeve 1 is controlled, thereby controlling the opening angle of the first expanding plate 6, so that the first expanding plate 6 opens to the set angle.

[0057] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of these embodiments are merely for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A directional grouting pipe, characterized in that, The device includes a sleeve, a grouting mechanism, and a hole-expanding mechanism. The grouting mechanism is slidably mounted in the sleeve. The upper end of the hole-expanding mechanism is hinged to the lower end of the sleeve, and the lower end of the hole-expanding mechanism is hinged to the outer wall of the lower end of the grouting mechanism. When the grouting mechanism slides relative to the sleeve, the hole-expanding mechanism can expand radially. The hole-expanding mechanism includes two symmetrically arranged hole-expanding components. Each hole-expanding component includes a first hole-expanding plate and a second hole-expanding plate. The upper end of the first hole-expanding plate is hinged to the lower end of the sleeve, and the upper end of the second hole-expanding plate is hinged to the lower end of the first hole-expanding plate. The lower end of the second hole-expanding plate is hinged to the outer wall of the lower end of the grouting mechanism. The grouting mechanism is located on the outer wall of its lower end; a hollow cavity is formed inside the first expanding plate, and multiple grout outlet holes are provided on the side wall of the first expanding plate. The lower end of the grouting mechanism is connected to the hollow cavity. The grouting mechanism includes a rod and two grouting hoses. The rod is slidably installed in the sleeve. Two first axial strip holes are symmetrically arranged on the side wall of the rod. Each grouting hose extends from the top of the rod into the rod and passes through one of the first axial strip holes to the outside of the rod and communicates with the hollow cavity of one of the first expanding plates. The lower end of the second expanding plate is hinged to the outer wall of the lower end of the rod.

2. The directional grouting pipe according to claim 1, characterized in that, The outer wall of the rod is provided with a limiting mechanism for restricting the relative circumferential movement of the rod and the sleeve. The limiting mechanism includes a limiting slider provided on the outer wall of the rod, and a second axial strip hole provided on the side wall of the sleeve for the limiting slider to slide along the axial direction of the sleeve.

3. The directional grouting pipe according to claim 2, characterized in that, The limiting slider is provided in two parts, and the two limiting sliders are symmetrically arranged on the outer wall of the rod. The sleeve has two second axial strip holes symmetrically arranged on its side wall.

4. The directional grouting pipe according to claim 1, characterized in that, It also includes a rotating mechanism, wherein an external thread is provided on the outer wall of the upper end of the rod, the rotating mechanism includes a rotating handle and a nut disposed on the upper part of the rotating handle, the rotating handle is disposed on the outside of the upper end of the rod, and the nut is threadedly sleeved on the outside of the upper end of the rod.

5. The directional grouting pipe according to claim 4, characterized in that, The rotating handle includes an annular plate and two handle rods respectively disposed at both ends of the annular plate. The nut is fixed to the upper part of the annular plate, and the annular plate is sleeved on the outside of the upper end of the handle.

6. A directional grouting method, characterized in that, Using the directional grouting pipe as described in any one of claims 1-5, the method includes the following steps: Step 1: Use drilling tools to drill holes to the desired depth in the strata that need to be reinforced; Step 2: Pre-determine the splitting direction and the depth of splitting grouting according to project requirements; Step 3: Align the hole enlarging mechanism with the preset splitting direction and lower the directional grouting pipe to the preset splitting grouting depth; Step 4: The grouting mechanism slides upward relative to the sleeve, thereby causing the hole expansion mechanism to expand radially, and then the directional grouting pipe moves, thereby forming a preset crack parallel to the directional grouting pipe or a preset crack perpendicular to the directional grouting pipe. Step 5: Adjust the grouting parameters according to the design requirements and start the grouting process.

7. The directional grouting method according to claim 6, characterized in that, In step four, after the hole-expanding mechanism expands radially, it lifts the directional grouting pipe upward along the axial direction, allowing the expanded hole-expanding mechanism to cut the soil and thus form a pre-set crack parallel to the directional grouting pipe.

8. The directional grouting method according to claim 6, characterized in that, In step four, after the hole-expanding mechanism expands radially, the directional grouting pipe is rotated, allowing the expanded hole-expanding mechanism to cut the soil, thereby forming a preset crack perpendicular to the directional grouting pipe.

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