A slope body anti-slide pile capable of correcting deviation and a construction method thereof

Abstract

The present application relates to geotechnical engineering technical field, especially to a kind of deviation-correcting slope body anti-slide pile and its construction method, including anti-slide pile body, two oppositely arranged grouting pipes are arranged in it, one grouting pipe is arranged on one side of landslide face, another grouting pipe is arranged on the opposite side of landslide face, one end of grouting pipe is stretched out from the top of anti-slide pile body to form grouting port, the other end is stretched out from the bottom of anti-slide pile body, and a plurality of jet grouting holes are sequentially arranged on the stretched-out part; when anti-slide pile is inclined and slips due to external conditions, the two grouting pipes in anti-slide pile are corrected by the way of differential pressure grouting.

Description

Technical Field

[0001] This invention relates to the field of geotechnical engineering technology, and in particular to a slope-correcting anti-slide pile and its construction method. Background Technology

[0002] Anti-slide piles are widely used in geotechnical engineering in my country due to their excellent anti-slide performance. Initially, landslides caused significant economic losses and casualties during construction. To prevent such problems, technicians proposed using anti-slide piles. After years of development, the structure and theory of anti-slide piles have become increasingly sophisticated. However, in practical applications, problems still exist.

[0003] The mechanism of anti-slide piles is that when the sliding surface slides, the weight of the landslide soil and rock and the superimposed weight will directly act on the pile body. The pile body bears the superimposed load, making the anti-slide pile a "passive pile". This type of pile is prone to deformation and sliding, and loses its function of retaining soil and resisting sliding. Most major projects are damaged due to such problems, causing huge economic losses.

[0004] The existing solution is to pull out the tilted anti-slide piles and drive in new ones. Although this effectively solves the problem of anti-slide piles losing their anti-slide properties due to displacement and deformation caused by soil slippage, it is costly and not conducive to construction. Summary of the Invention

[0005] The purpose of this invention is to provide a slope-correcting anti-slide pile and its construction method, which can simultaneously correct slope deviation and reinforce the pile body, overcoming the shortcomings of existing anti-slide pile correction technologies. To achieve the above objective, this invention provides the following technical solution:

[0006] In a first aspect, the present invention provides a slope-correcting anti-slide pile, comprising an anti-slide pile body and two grouting pipes arranged opposite each other inside, wherein one of the grouting pipes is arranged on one side of the landslide surface and the other grouting pipe is arranged on the opposite side of the landslide surface, one end of the grouting pipe extends from the top of the anti-slide pile body to form a grouting port, and the other end extends from the bottom of the anti-slide pile body, with a plurality of grouting holes arranged sequentially above and below the extended portion.

[0007] Secondly, the present invention provides a method for constructing anti-slide piles for slopes that can correct deviations, comprising the following steps:

[0008] Drill holes to the design depth and construct anti-slide piles as described in the first aspect, with one grouting pipe arranged on one side of the landslide surface and the other grouting pipe arranged on the opposite side of the landslide surface;

[0009] An inclinometer is installed on the top of the anti-slide pile. When the anti-slide pile deviates, differential pressure grouting is used to correct the deviation through the two grouting pipes inside the anti-slide pile. The inclinometer is observed, and grouting is stopped after the correction is completed.

[0010] As a further technical solution, when the inclination angle between the anti-slide pile and the horizontal plane is greater than 90°, the grouting pressure of the grouting pipe on the opposite side of the landslide surface is greater than that of the other grouting pipe; when the inclination angle between the anti-slide pile and the horizontal plane is less than 90°, the grouting pressure of the grouting pipe on one side of the landslide surface is greater than that of the other grouting pipe.

[0011] As a further technical solution, several pressure relief holes are excavated on the tilted side of the anti-slide pile before grouting, and backfilling is carried out after the anti-slide pile is corrected.

[0012] As a further technical solution, several pressure relief holes are arranged in a straight line and located on the same vertical plane as the anti-slide piles.

[0013] As a further technical solution, the depth of the decompression hole is half the length of the anti-slide pile.

[0014] As a further technical solution, after grouting is completed and the bottom cement grout has solidified, the pressure relief holes are backfilled from far to near to complete the anti-slide pile correction and reinforcement.

[0015] As a further technical solution, the spacing between adjacent pressure relief holes is consistent, and there is a set distance between the anti-slide pile and the nearest pressure relief hole.

[0016] As a further technical solution, when embedding the piles, the grouting ports of the anti-slide piles are oriented towards the landslide surface and the opposite side of the landslide surface, and the grouting ports are set at a distance above the ground.

[0017] As a further technical solution, the grouting pipe at the bottom of the anti-slide pile extends a set distance from the bottom of the pile, and several grouting holes are evenly arranged on the upper and lower parts of the extended portion.

[0018] The beneficial effects of the present invention are as follows:

[0019] (1) The anti-slide pile of the present invention has two grouting pipes arranged opposite each other inside. When the anti-slide pile tilts and slides due to external conditions, the two grouting pipes inside the anti-slide pile are corrected by differential pressure grouting. Specifically, the grouting pressure of the grouting pipe on the tilted side is greater than that of the grouting pipe on the other side. Under the action of the grouting pressure difference, the tilted anti-slide pile gradually returns to its original position, thereby realizing the correction of the anti-slide pile.

[0020] (2) The present invention uses a grouting pipe to perform differential pressure grouting correction on the anti-slide pile. For the anti-slide pile, it can not only effectively correct the deviation, but also connect the grouting body formed after grouting with the anti-slide pile body into a whole, improve the overall stability of the pile body and the overall stiffness of the anti-slide pile, realize the reinforcement after correction, and effectively solve the two most important problems of deformation and movement in the anti-slide pile.

[0021] (3) This invention can directly correct the tilted anti-slide piles without re-driving the piles. The construction process is simple, which can effectively improve the construction efficiency and reduce the maintenance cost of anti-slide piles in the project. After correction, the anti-slide rate of the pile body is high, which has a significant effect on reducing project costs and improving the quality of later maintenance of anti-slide piles.

[0022] (4) The present invention excavates several pressure relief soil holes on the inclined side of the anti-slide pile, which can reduce the active earth pressure of the anti-slide pile and the earth pressure it receives during grouting, so that the cement grout can be injected into the bottom of the anti-slide pile more smoothly and evenly. Attached Figure Description

[0023] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute a limitation thereof. It should also be understood that these drawings are for simplicity and clarity and are not necessarily drawn to scale. The invention will now be described and explained with additional features and details using the drawings, wherein:

[0024] Figure 1 A schematic diagram showing that the anti-slide pile body did not tilt in an embodiment of the present invention is shown;

[0025] Figure 2 This diagram illustrates the situation before grouting when the pile body tilts at an angle greater than 90° to the horizontal plane, according to an embodiment of the present invention.

[0026] Figure 3 This diagram illustrates the grouting process after the pile body tilts at an angle greater than 90° to the horizontal plane, as shown in an embodiment of the present invention.

[0027] Figure 4 This diagram illustrates the pre-grouting process when the pile body tilts at an angle of less than 90° to the horizontal plane, according to an embodiment of the present invention.

[0028] Figure 5 This diagram illustrates the grouting process after the pile body tilts at an angle of less than 90° to the horizontal plane, as shown in an embodiment of the present invention.

[0029] Figure 6 A schematic diagram of the spatial arrangement of soil anti-slide piles and pressure relief soil holes in an embodiment of the present invention is shown.

[0030] In the diagram: 1. Anti-slide pile body; 2. Pressure relief hole; 3. Inclinometer; 4. Grouting pipe; 5. Grouting body; 6. Landslide body. Detailed Implementation

[0031] The technical solutions in typical embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0032] Example 1

[0033] like Figures 1-6 As shown, this embodiment provides a slope-correcting anti-slide pile, including an anti-slide pile body 1, with two opposing grouting pipes 4 inside. One grouting pipe 4 is arranged on one side of the landslide surface, and the other grouting pipe 4 is arranged on the opposite side of the landslide surface. One end of the grouting pipe 4 extends from the top of the anti-slide pile body 1 to form a grouting port, and the other end extends from the bottom of the anti-slide pile body 1, with several grouting holes arranged sequentially above and below the extended portion. In this embodiment, the anti-slide pile is a square pile.

[0034] Example 2

[0035] This embodiment provides a construction method for slope-correcting anti-slide piles, including the following steps:

[0036] 1. Drill holes to the designed depth and construct anti-slide piles as shown in Example 1, wherein one grouting pipe 4 is arranged on one side of the landslide surface, and the other grouting pipe 4 is arranged on the opposite side of the landslide surface. Specific steps include:

[0037] 1. Before construction, the coordinates of the pile location and the elevation of the pile top should be checked to ensure that they are correct before construction can begin. The pile holes are excavated manually.

[0038] 2. During the excavation of the pile hole, water accumulated in the hole should be removed in a timely manner. When the water-bearing capacity of the sliding body is poor, direct drainage can be used in the pit; when the water-bearing capacity is good and the water volume is large, external pipe pumps should be used to drain the water from the pile hole.

[0039] 3. Reinforced concrete retaining walls should be installed promptly during pile hole excavation. The height of the retaining wall at one time should be determined based on the maximum excavation depth. The pile hole after retaining the wall should remain vertical and smooth.

[0040] 4. The steel reinforcement cage is fabricated on site, hoisted and installed inside the pile hole.

[0041] 5. Place the grouting pipe 4, with the grouting ports of the anti-slide pile facing the landslide surface and the opposite side of the landslide surface, respectively. The grouting ports should be set a certain distance above the ground to facilitate subsequent grouting correction. The grouting pipe 4 at the bottom of the anti-slide pile extends a certain distance beyond the pile bottom, with several grouting holes evenly arranged vertically on the extended part. In this embodiment, three to four grouting holes are set at the bottom of the pile, with each grouting hole spaced approximately 30cm apart.

[0042] 6. Concrete pouring for the anti-slide pile body 1. (1) After each continuous pour of 0.5 to 0.7 m, a vibrator should be inserted to compact the concrete. (2) Curing should be carried out on the exposed surface of the anti-slide pile. (3) The water-cement ratio of the concrete should be 0.5 to 0.6, the slump should be 160 to 200 mm, the sand ratio should be 40% to 50%, and the cement content should not be less than 350 kg / m³. 3 .

[0043] 7. When the water depth at the bottom of the hole exceeds 100mm, but drainage is possible, measures such as increasing pumping capacity or adding pumping equipment should be taken as much as possible. If the water in the hole is difficult to drain, underwater grouting should be used for concrete construction to ensure the quality of the pile concrete.

[0044] II. When the anti-slide pile tilts or slides due to external conditions, the two grouting pipes 4 inside the anti-slide pile are reinforced by differential pressure grouting. The specific steps include:

[0045] After the anti-slide piles are installed, they form a shape like... Figure 1 The anti-slide piles shown are arranged as follows: Figure 6 As shown, the surface of the landslide body is the landslide surface, and the opposite side of the landslide surface is the horizontal ground. An inclinometer 3 is installed on the top of the anti-slide pile. When the anti-slide pile tilts or slides due to external conditions, differential pressure grouting is used to correct the deviation through the two grouting pipes 4 inside the anti-slide pile. The inclinometer 3 is observed, and grouting is stopped after the correction is completed.

[0046] Specifically, by observing the tilt angle of the inclinometer, when the tilt angle between the anti-slide pile and the horizontal plane is greater than 90°, the grouting pressure of grouting pipe 4 on the opposite side of the landslide surface is greater than that of the other grouting pipe 4. Figure 2 and Figure 3 As shown.

[0047] When the angle between the anti-slide pile and the horizontal plane is less than 90°, the grouting pressure of grouting pipe 4 on one side of the landslide surface is greater than that of the other grouting pipe 4, such as... Figure 4 and Figure 5 As shown.

[0048] In this embodiment, two grouting pipes 4 are installed opposite each other inside the anti-slide pile. When the anti-slide pile tilts or slides due to external conditions, the two grouting pipes 4 inside the anti-slide pile are corrected by differential pressure grouting. Specifically, the grouting pipe on the tilted side (tilted side refers to the inner side in the tilt direction) Figure 2 The middle refers to the left grouting pipe. Figure 4 The grouting pressure of the right grouting pipe is greater than that of the other grouting pipe. Under the action of the grouting pressure difference, the tilted anti-slide pile gradually returns to its original position, thus achieving the correction of the anti-slide pile.

[0049] Differential pressure grouting is performed on the anti-slide pile through the grouting pipe 4. This not only effectively corrects the deviation of the anti-slide pile, but also connects the grout body 5 formed after grouting with the anti-slide pile body 1 into a whole, improving the overall stability of the pile body and the overall rigidity of the anti-slide pile, and achieving reinforcement after deviation correction. This can effectively solve the two most important problems of deformation and movement in the anti-slide pile.

[0050] It can directly correct tilted anti-slide piles without the need for re-driving, simplifying the construction process and effectively improving construction efficiency and reducing the maintenance cost of anti-slide piles in the project. After correction, the pile body has a high anti-slide rate, which has a significant effect on reducing project costs and improving the quality of later maintenance of anti-slide piles.

[0051] Before grouting, several pressure relief holes 2 are excavated on the inclined side of the anti-slide pile. After the anti-slide pile is corrected, it is backfilled. In this embodiment, three pressure relief holes 2 are excavated. The three pressure relief holes 2 are arranged in a straight line and are located on the same vertical plane as the anti-slide pile.

[0052] The pressure relief hole 2 can reduce the active earth pressure on the anti-slide pile and the earth pressure it experiences during grouting, allowing the cement grout to be injected more smoothly and evenly into the bottom of the anti-slide pile.

[0053] If the inclination angle of the anti-slide pile is greater than 90°, positioning and drilling are carried out on the landslide surface. The holes are manually excavated, and the depth of the excavated holes is half the length of the anti-slide pile. The diameter of the pressure relief hole 2 is 70cm according to the soil layer conditions. The spacing between adjacent pressure relief holes 2 is consistent. In this embodiment, the spacing between adjacent pressure relief holes is 1m. There is a set distance between the anti-slide pile and the nearest pressure relief hole 2. In this embodiment, it is 2m to ensure that the anti-slide pile is not damaged during the excavation process.

[0054] After the construction of the pressure relief hole 2 is completed, grouting begins on the two grouting pipes 4. Dynamic grouting is carried out according to the changes of the inclinometer 3. During the grouting process, the reading of the inclinometer 3 is observed in real time to understand its reset status. When the inclinometer shows an inclination of 0, the grouting correction is completed and the grouting is stopped. After the 7-day curing period, when the cement at the bottom of the anti-slide pile has reached a certain hardness, the pressure relief hole 2 is backfilled. The backfilling sequence follows the principle of from far to near to complete the slope anti-slide pile correction and reinforcement.

[0055] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present invention by utilizing the methods and techniques disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the protection scope of the technical solutions of the present invention.

Claims

1. A slope-correcting anti-slide pile, characterized in that, The device includes an anti-slide pile body, which contains two grouting pipes arranged opposite each other. One of the grouting pipes is arranged on one side of the landslide surface, and the other grouting pipe is arranged on the opposite side of the landslide surface. One end of the grouting pipe extends from the top of the anti-slide pile body to form a grouting port, and the other end extends from the bottom of the anti-slide pile body, with several grouting holes arranged sequentially above and below the extended part. Before grouting, several pressure relief holes are excavated on the tilted side of the anti-slide pile, and backfilling is carried out after the anti-slide pile is corrected.

2. A method for constructing anti-slide piles for slopes capable of correction, characterized in that, Includes the following steps: Drill holes to the designed depth and construct the anti-slide pile as described in claim 1, wherein one grouting pipe is arranged on one side of the landslide surface and the other grouting pipe is arranged on the opposite side of the landslide surface; An inclinometer is installed on the top of the anti-slide pile. When the anti-slide pile deviates, differential pressure grouting is used to correct the deviation through the two grouting pipes inside the anti-slide pile. The inclinometer is observed, and grouting is stopped after the deviation correction is completed.

3. The method for constructing anti-slide piles for correctable slopes as described in claim 2, characterized in that, When the inclination angle between the anti-slide pile and the horizontal plane is greater than 90°, the grouting pressure of the grouting pipe on the opposite side of the landslide surface is greater than that of the other grouting pipe; when the inclination angle between the anti-slide pile and the horizontal plane is less than 90°, the grouting pressure of the grouting pipe on one side of the landslide surface is greater than that of the other grouting pipe.

4. The method for constructing anti-slide piles for correctable slopes as described in claim 3, characterized in that, Before grouting, several pressure relief holes are excavated on the inclined side of the anti-slide pile, and backfilling is carried out after the anti-slide pile is corrected.

5. The method for constructing anti-slide piles for correctable slopes as described in claim 4, characterized in that, Several pressure relief holes are arranged in a straight line and are located on the same vertical plane as the anti-slide piles.

6. The method for constructing anti-slide piles for correctable slopes as described in claim 4, characterized in that, The depth of the pressure relief hole is half the length of the anti-slide pile.

7. The method for constructing anti-slide piles for correctable slopes as described in claim 5, characterized in that, After grouting is completed and the bottom cement grout has solidified, the soil pressure relief holes are backfilled from far to near to complete the anti-slide pile correction and reinforcement.

8. The method for constructing anti-slide piles for correctable slopes as described in claim 5, characterized in that, The spacing between adjacent pressure relief holes is consistent, and there is a set distance between the anti-slide pile and the nearest pressure relief hole.

9. The method for constructing anti-slide piles for correctable slopes as described in claim 2, characterized in that, When embedding the piles, the grouting ports of the anti-slide piles should be oriented towards the landslide surface and the opposite side of the landslide surface, with the grouting ports set at a distance above the ground.

10. The method for constructing anti-slide piles for correctable slopes as described in claim 2, characterized in that, The grouting pipe at the bottom of the anti-slide pile extends a set distance from the bottom of the pile, and several grouting holes are evenly arranged at the top and bottom of the extended part.

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