A device and method for fixing granular microporous cast-in-place embedded piles

Abstract

The present application provides a device and method for fixing granular microporous cast-in-place pre-buried piles, which relates to the technical field of pre-buried pile construction. The device includes a wall casing; a pre-buried pile with one end inserted into the wall casing and the other end extending out of a drilled hole; a grouting layer filled in the gap between the wall casing and the pre-buried pile; a positioning mechanism for positioning the pre-buried pile on the wall casing, the positioning mechanism makes the central axis of the pre-buried pile and the central axis of the wall casing collinear; the positioning mechanism includes a first positioning part and a second positioning part, the first positioning part and the second positioning part are clamped; wherein the first positioning part is located above the wall casing; the second positioning part is arranged at a preset position of the pre-buried pile, so that when the second positioning part is in a clamped state, the part of the pre-buried pile located in the wall casing is at a preset height. The device provided by the present invention solves the problems of easy collapse of the hole mouth, inaccurate positioning of the pre-buried pile, and insufficient verticality of the existing microporous cast-in-place piles.

Description

Technical Field

[0001] The present application relates to the technical field of pre-buried pile construction, and in particular to a device and method for fixing granular microporous cast-in-place pre-buried piles. Background Art

[0002] A granular soil slope is a natural slope composed of loose granular materials (such as sand, gravel, clay, etc.). It usually does not have strong bonding strength, the material is loose and is easily affected by external factors (such as precipitation, vibration, etc.) to cause landslides or collapses. In my country's high-altitude and high-altitude areas, due to complex geological structures and large climate changes, a large number of granular soil slopes have been formed, especially in some earthquake zones or areas prone to landslides. The development of granular soil slopes is very common. Due to its low stability and large slope, granular soil slopes are prone to deformation, especially after water infiltration, they are more unstable. Therefore, it is necessary to set up reinforcement support measures on the slope surface to improve its stability.

[0003] The use of microporous cast-in-place piles can reinforce the soft foundation of the granular soil slope to a certain extent, and can be used to support basic measures and power and monitoring equipment. However, in the actual construction process, the vibration effect generated when the drill bit drills into the soil can easily cause the hole mouth of the loose gravel soil layer to collapse. At the same time, due to the lack of effective positioning devices, the conventional microporous grouting construction method often has problems such as insufficient verticality of the embedded piles, center position deviation, or the size of the embedded parts not meeting the construction standards after the concrete grouting is formed, which leads to a significant decrease in the pull-out, anti-slip, and anti-overturning capabilities of the upper support structure, affecting the long-term safety and service life of the equipment. Summary of the invention

[0004] In view of the above problems, one of the purposes of the present invention is to provide a granular microporous cast-in-place pre-buried pile fixing device to solve the problems of easy collapse of the hole mouth, inaccurate positioning of the pre-buried pile, insufficient verticality and insufficient vertical height in the existing microporous cast-in-place piles. The second purpose of the present invention is to provide a granular microporous cast-in-place pre-buried pile fixing method.

[0005] In order to achieve one of the objectives, the first aspect of the present invention provides a granular microporous cast-in-place embedded pile fixing device, the technical solution adopted is:

[0006] A granular microporous cast-in-place embedded pile fixing device, the device comprising:

[0007] Wall casing, used for burying in the borehole;

[0008] A pre-buried pile, one end of which is inserted into the wall protection casing and the other end of which extends out of the drill hole;

[0009] A grouting layer is filled in the gap between the wall protection casing and the embedded pile;

[0010] A positioning mechanism, allowing the embedded pile to pass through and positioning the embedded pile on the wall protection sleeve so that the central axis of the embedded pile is in line with the central axis of the wall protection sleeve;

[0011] The positioning mechanism includes a first positioning portion and a second positioning portion, and the first positioning portion and the second positioning portion are clamped together; wherein the first positioning portion is located above the wall protection sleeve; the second positioning portion is arranged at a preset position of the embedded pile, so that when the second positioning portion is in a clamped state, the portion of the embedded pile located in the wall protection sleeve is at a preset height.

[0012] Optionally, the first positioning portion includes:

[0013] An outer sleeve, at least a first portion of which is located in the borehole and contacts the upper edge of the wall protection sleeve, and a remaining second portion of which extends out of the borehole;

[0014] An inner sleeve, which is sleeved inside the outer sleeve and allows the embedded pile to extend axially through the inner sleeve;

[0015] At least one notch is formed in the area of ​​the outer sleeve corresponding to the second part, and at least one supporting wing is arranged on the outer wall of the inner sleeve, and a plurality of supporting wings are correspondingly engaged in the plurality of notches.

[0016] Optionally, the notch passes through the second portion of the outer sleeve, and each of the support wings is L-shaped;

[0017] The transverse section of the L-shaped supporting wing extends horizontally out of the notch, and the upper edge of the transverse section is flush with the upper edge of the notch, and the lower edge of the transverse section is flush with the lower edge of the notch;

[0018] Wherein, the vertical section of the L-shaped supporting wing extends axially, and the upper edge of the vertical section is flush with the lower edge of the horizontal section, and the lower edge of the vertical section is flush with the lower edge of the inner sleeve;

[0019] The upper edge of the outer sleeve is flush with the upper edge of the outer sleeve, and the lower edge of the outer sleeve is flush with the lower edge of the inner sleeve; the outer edge of the vertical section contacts the inner wall of the outer sleeve.

[0020] Optionally, the inner sleeve is configured as a split structure.

[0021] Optionally, the inner sleeve comprises a first mounting portion and a second mounting portion which are symmetrical to each other, and the first mounting portion and the second mounting portion are both provided with two supporting wings; and,

[0022] The first mounting portion and the second mounting portion are spliced ​​into the inner sleeve having a positioning hole, and the embedded pile passes through the positioning hole.

[0023] Optionally, the second positioning portion is a steel sheet, and the steel sheet abuts against an upper edge of the inner sleeve.

[0024] Optionally, the device further comprises a column, one end of which is inserted into the embedded pile and fixed to the embedded pile by bolts; wherein the bolts are located on the steel sheet.

[0025] Optionally, a steel cage is connected to the bottom of the embedded pile in the wall protection casing.

[0026] Optionally, a plurality of through holes are formed on the wall protection sleeve.

[0027] To achieve the second purpose, the second aspect of the present invention provides a method for fixing granular microporous cast-in-place pre-buried piles, the technical solution adopted is:

[0028] A method for fixing a granular microporous cast pre-buried pile, which relies on the granular microporous cast pre-buried pile fixing device provided by the first aspect of the present invention for fixing, and the fixing method comprises:

[0029] According to the location of the borehole on the granular soil slope, the wall casing is buried in the borehole;

[0030] Placing the first positioning portion above the wall protection sleeve;

[0031] Based on a preset height required for burying the pre-buried pile, fixing the second positioning portion at a preset position of the pre-buried pile;

[0032] Pass the embedded pile with the second positioning part fixed thereon through the positioning mechanism from top to bottom and enter into the wall protection sleeve;

[0033] When the second positioning part and the first positioning part on the embedded pile are engaged, the embedded pile is positioned on the wall protection sleeve;

[0034] pouring grouting material between the wall protection sleeve and the embedded pile, and stopping pouring when the grouting material reaches below the first positioning portion;

[0035] After the grouting material is solidified to obtain a grouting layer, the first positioning portion is taken out to complete the fixation of the microporous cast-in-place embedded piles of the granular soil slope.

[0036] Compared with the prior art, this application has the following significant improvements:

[0037] The device provided by the embodiment of the present invention includes a wall protection casing for being buried in a drilled hole; an embedded pile with one end passing through the wall protection casing and the other end extending out of the drilled hole; a grouting layer filling the gap between the wall protection casing and the embedded pile; a positioning mechanism that allows the embedded pile to pass through and positions the embedded pile on the wall protection casing so that the central axis of the embedded pile is colinear with the central axis of the wall protection casing; the positioning mechanism includes a first positioning portion and a second positioning portion, the first positioning portion and the second positioning portion being snap-connected; wherein the first positioning portion is located above the wall protection casing; the second positioning portion is arranged at a preset position of the embedded pile, so that when the second positioning portion is in a snap-connected state, the portion of the embedded pile located in the wall protection casing is at a preset height.

[0038] By adopting the technical solution of the present invention, a wall protection sleeve is fixed in the drill hole to prevent the hole wall from collapsing during the construction process. A positioning mechanism is used to locate and assist in fixing the center position and vertical height of the embedded pile, thereby avoiding the problems of inaccurate positioning, center position offset and insufficient verticality of the embedded pile during the construction process. Through the clamping mechanism of the first positioning part and the second positioning part, it is ensured that the vertical height of the pile body meets the design requirements, and the material size of the embedded parts does not meet the construction standards. In this way, the embodiment of the present invention can effectively solve the problems of easy collapse of the hole mouth, inaccurate positioning of the embedded pile, insufficient verticality, insufficient vertical height, etc., which exist in the conventional embedded pile positioning device of power, monitoring and other equipment, resulting in poor grouting molding quality, low pull-out and anti-overturning capabilities, and substandard bracket height. While improving construction efficiency, it also improves the long-term safety and service life of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the description of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0040] Figure 1 A schematic diagram of the overall structure of a granular microporous cast-in-place embedded pile fixing device provided in one embodiment of the present application when it is fixed on a granular soil slope;

[0041] Figure 2 A schematic diagram of the three-dimensional structure of a first positioning portion provided in one embodiment of the present application;

[0042] Figure 3 A schematic diagram of the three-dimensional structure of an outer sleeve provided in one embodiment of the present application;

[0043] Figure 4 A schematic diagram of the three-dimensional structure of an inner sleeve provided in an embodiment of the present application;

[0044] Figure 5A schematic diagram of the split structure of the inner sleeve provided in one embodiment of the present application;

[0045] Figure 6 A schematic diagram of the three-dimensional structure of a wall protection sleeve provided in one embodiment of the present application;

[0046] Figure 7 A flowchart of the steps of a method for fixing granular microporous cast-in-place embedded piles provided in one embodiment of the present application.

[0047] Description of reference numerals:

[0048] 1. Embedded pile; 2. First positioning part; 21. Outer sleeve; 211. Notch; 22. Inner sleeve; 221. First mounting part; 222. Second mounting part; 23. Support wing; 231. Horizontal section; 232. Vertical section; 3. Second positioning part; 4. Wall sleeve; 41. Through hole; 5. Column; 6. Steel cage. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0050] It can be known that microporous grouting technology is a basic engineering technology that forms tiny holes in the soil and pours concrete to form a pile foundation. The embedded pile 1 is a pile body pre-buried in civil construction, usually used as a foundation fixing point or to support subsequent installed structural parts. The microporous grouting embedded pile technology combines microporous grouting and embedded pile technology. By driving slender steel bars and embedded piles 1 into the soil layer and injecting cement slurry and other grouting materials, a pile foundation with high bearing capacity, foundation reinforcement and anti-seepage performance is formed.

[0051] In the related art, a photovoltaic microporous cast-in-place pile center column fixing device and its construction method have been proposed, including: a fixed shaft, rotatably connected with an articulated arm, the bottom of the fixed shaft is connected with a support plate, the support plate is supported on one end of the articulated arm, and the support plate is equipped with a first locking member for locking the articulated arm; a height-adjustable support foot, which can be flipped and installed on the other end of the articulated arm, and a support rod is detachably connected between the support foot and the articulated arm; two size-adjustable auxiliary column collars for mounting the photovoltaic microporous cast-in-place pile center column, the auxiliary column collar is arranged below the support plate, the auxiliary column collar is coaxially arranged with the fixed shaft, the auxiliary column collar is articulated with an inclined suspension arm, and the other end of the inclined suspension arm is adjustably installed on each articulated arm. However, this technology does not take into account the hole collapse problem faced in the process of microporous casting on loose gravel soil layers. At the same time, the positioning device used is large in size and complex in device, which is not conducive to construction and transportation in high-cold and high-altitude areas.

[0052] In the related technology, some people have proposed a micro-porous cast-in-place pile foundation system, construction method and application of mountain photovoltaic support. The micro-porous cast-in-place pile foundation system of mountain photovoltaic support has a borehole drilled on the mountain slope, a reinforcing material arranged in the borehole, fine stone concrete poured into the borehole to form a pile, a pier poured on the top of the pile, a steel plate embedded on the top of the pier, and the upper part is connected to the photovoltaic support column by bolts. However, although this technology improves the load-bearing capacity of the foundation through reinforcing materials, there are problems such as inaccurate pile hole positioning and easy hole collapse, which has great limitations.

[0053] Therefore, traditional microporous grouting pre-buried pile technologies have problems such as easy collapse of the hole mouth, inaccurate positioning of the pre-buried piles, and insufficient verticality, resulting in poor grouting molding quality, low pull-out and anti-overturning capabilities, and substandard equipment bracket height, which affects the long-term safety and service life of the equipment.

[0054] In view of this, the present invention aims to propose a microporous grouting pre-buried pile fixing device and a fixing method suitable for granular soil slopes, which adopts a spliced ​​auxiliary positioning mechanism and a high-strength porous sleeve to effectively solve the problems of insufficient verticality of the pre-buried piles, inaccurate center positioning, low foundation pull-out and anti-overturning capacity, and insufficient vertical height of the upper structure columns in the conventional microporous grouting process.

[0055] like Figure 1 As shown, Figure 1The overall structural schematic diagram of the granular microporous grouting pre-embedded pile fixing device of the present invention is shown, which is a granular microporous grouting pre-embedded pile fixing device, the device comprising: a wall protection sleeve 4 for being buried in a drilled hole; an embedded pile 1, one end of which is penetrated in the wall protection sleeve 4, and the other end extends out of the drilled hole; a grouting layer, which is filled in the gap between the wall protection sleeve 4 and the embedded pile 1; a positioning mechanism, which allows the embedded pile 1 to pass through and positions the embedded pile 1 on the wall protection sleeve 4 so that the central axis of the embedded pile 1 is in line with the central axis of the wall protection sleeve 4; the positioning mechanism comprises a first positioning portion 2 and a second positioning portion 3, the first positioning portion 2 and the second positioning portion 3 are clamped; wherein the first positioning portion 2 is located above the wall protection sleeve 4; the second positioning portion 3 is arranged at a preset position of the embedded pile 1, so that when the second positioning portion 3 is in a clamped state, the part of the embedded pile 1 located in the wall protection sleeve 4 is at a preset height.

[0056] Specifically, the wall protection sleeve 4 mainly plays a supporting role and is placed in the borehole to prevent the borehole from collapsing during the construction process, thereby providing support and protection for the subsequent cast-in-place piles. When it is necessary to excavate and support the granular soil slope, the existing wall protection sleeve 4 can be used to drill according to the designed pile diameter and depth, so that the borehole diameter is compatible with the pipe diameter of the wall protection sleeve 4. Therefore, after the drilling rig has completed the hole cleaning, the wall protection sleeve 4 can be immediately placed in the borehole, and the outer wall of the wall protection sleeve 4 is in close contact with the wall of the borehole to prevent the collapse of the hole caused by construction disturbance. Among them, the height of the wall protection sleeve 4 is also consistent with the designed grouting height. Usually, the borehole is a circular hole, so the wall protection sleeve 4 is set as a circular sleeve.

[0057] The embedded pile 1 is a pile tube, which is hollow inside and is used to install the column 5. The embedded pile 1 is placed in the wall protection sleeve 4 from top to bottom, so that a part of it is inserted into the wall protection sleeve 4 and the other part is extended out of the wall protection sleeve 4, which is convenient for installing the column 5 to provide bearing capacity. Among them, the height of the part of the embedded pile 1 located in the wall protection sleeve 4 is less than the height of the wall protection sleeve 4.

[0058] For ease of understanding, the axial extension length of each component in this article is defined as the height, and the radial extension length is defined as the length.

[0059] The embedded pile 1 is positioned in the wall protection sleeve 4 by a positioning mechanism, and extends through the positioning mechanism into the wall protection sleeve 4, wherein the positioning mechanism can be completely located in the borehole, partially located in the borehole, or completely located outside the borehole.

[0060] The grouting layer is filled in the gap between the wall casing 4 and the embedded pile 1 to form a pile foundation, which not only fixes the embedded pile 1 in the drilled hole, but also enhances the bonding force between the pile foundation and the soil, and enhances the stability of the granular soil. The grouting layer is formed by pouring cement slurry or other reinforcement materials into the gap and solidifying.

[0061] When pouring cement slurry, the embedded pile 1 is pre-positioned on the wall casing 4 by the positioning mechanism in this embodiment, so that the grouting layer after solidification can fix the embedded pile 1 at the center position in the borehole and at a suitable vertical height. Specifically, the first positioning part 2 of the positioning mechanism is located directly above the wall casing 4, and the central axis of the positioning mechanism is collinear with the central axis of the wall casing 4. When the embedded pile 1 passes through the positioning mechanism, it is clamped on the first positioning part 2 through the second positioning part 3 provided thereon. Therefore, during construction, it is very convenient to first pass the embedded pile 1 through the center position of the second positioning part 3, and let the first positioning part 2 and the second positioning part 3 be in a clamping state at the center position, so that the central axis of the embedded pile 1 can be easily made collinear with the central axis of the wall casing 4.

[0062] The central axis of each component is perpendicular to the surface of the soil layer where the borehole is located.

[0063] First, when burying the pre-embedded pile 1, the pre-embedded pile 1 first freely passes through the center of the positioning mechanism. When the first positioning part 2 and the second positioning part 3 are engaged, the pre-embedded pile 1 can be regarded as being correctly placed in the center of the wall casing 4, thereby improving the positioning accuracy. At the same time, since the first positioning part 2 and the second positioning part 3 are engaged together, they play a role in assisting the fixing of the pre-embedded pile 1. Therefore, when pouring cement slurry, the pile body position of the pre-embedded pile 1 is locked, which can maintain the center position of the pre-embedded pile 1 and restrict the movement of the pre-embedded pile 1. This avoids the center position offset or pile body tilting caused by the action of force during the burying process and the grouting process, and ensures that the pre-embedded pile 1 is always vertical during the entire process from burying to grouting.

[0064] Furthermore, the clamping position between the first positioning part 2 and the second positioning part 3 can be selected before construction. Therefore, the first positioning part 2 is located above the wall protection sleeve 4 to fix its position, and by changing the height of the second positioning part 3 relative to the embedded pile 1, the height of the part of the embedded pile 1 extending into the wall protection sleeve 4 and the part extending out of the drilled hole can be changed when the embedded pile 1 is clamped to the first positioning part 2 through the second positioning part 3.

[0065] Exemplarily, the embedded pile 1 is also a circular sleeve, and the second positioning portion 3 is set in the middle position of the circular sleeve. The middle and lower part of the embedded pile 1 passes through the first positioning portion 2 and enters the wall protection sleeve 4, and the middle and upper part is located above the first positioning portion 2. When the second positioning portion 3 and the first positioning portion 2 are in a clamping state, since the specification parameters of the first positioning portion 2 and the specification parameters of the embedded pile 1 are determined, the height of the part of the embedded pile 1 located in the wall protection sleeve 4 can be known. Similarly, when the second positioning portion 3 is set at a position closer to the upper end, the height of the part of the embedded pile 1 extending into the wall protection sleeve 4 becomes higher, and the height of the part extending out of the drilled hole becomes lower. When the second positioning portion 3 is set at a position closer to the lower end, the height of the part of the embedded pile 1 extending into the wall protection sleeve 4 becomes lower, and the height of the part extending out of the drilled hole becomes higher.

[0066] Therefore, in this embodiment, by setting the second positioning at a preset position, when the two parts are engaged, the pile body is locked when it reaches the preset height, so that it can be ensured that the part of the embedded pile 1 inserted into the wall protection sleeve 4 is the preset height required by the construction personnel. That is, the insertion depth of the embedded pile 1 is controllable, and its axis is ensured to be perpendicular to the ground, so as to solve the problem of insufficient verticality and insufficient vertical height during the fixing process of the current embedded pile 1.

[0067] The preset height specifically refers to the ideal position or design height when the embedded pile 1 is installed. This embodiment does not limit this.

[0068] In summary, the present embodiment adopts the wall protection sleeve 4 to be fixed in the borehole, which provides a stable construction environment and prevents the hole wall from collapsing during the drilling process. It is particularly suitable for loose granular soil with insufficient stability, and ensures the smooth construction of subsequent bored piles. The positioning mechanism is used to locate and assist in fixing the center position and vertical height of the embedded pile 1, avoiding the problems of inaccurate positioning, center position offset and insufficient verticality of the embedded pile 1 during the construction process. Through the clamping mechanism of the first positioning part 2 and the second positioning part 3, it is ensured that the vertical height of the pile body meets the design requirements, and the material size of the embedded parts does not meet the construction standards. In this way, the embodiment of the present invention can effectively solve the problems of easy collapse of the hole mouth, inaccurate positioning of the embedded pile 1, insufficient verticality, insufficient vertical height, etc., which exist in the conventional power, monitoring and other equipment embedded pile 1 positioning device, resulting in poor grouting molding quality, low pull-out and anti-overturning capabilities, and substandard support height. While improving construction efficiency, it also improves the long-term safety and service life of the structure.

[0069] like Figure 2-Figure 4 As shown, Figure 2 is a schematic diagram of the three-dimensional structure of the first positioning part; Figure 3 Schematic diagram of the three-dimensional structure of the outer sleeve; Figure 4It is a schematic diagram of the three-dimensional structure of the inner sleeve. In a further technical solution, the first positioning part 2 includes: an outer sleeve 21, at least the first part of which is located in the borehole and contacts the upper edge of the wall protection sleeve 4, and the remaining second part extends out of the borehole; an inner sleeve 22, which is sleeved in the outer sleeve 21 and allows the embedded pile 1 to extend axially through the inner sleeve; at least one notch 211 is provided in the area of ​​the outer sleeve 21 corresponding to the second part, and at least one supporting wing 23 is provided on the outer wall of the inner sleeve 22, and multiple supporting wings 23 are correspondingly clamped in multiple notches 211.

[0070] In this embodiment, the first positioning portion 2 includes two inner and outer sleeves that are radially spaced apart. The outer sleeve 21 and the inner sleeve 22 are concentrically arranged and have different inner diameters. The outer sleeve 21 is located outside the inner sleeve 22. The outer sleeve 21 is used to determine the grouting height and support the inner sleeve 22. The inner sleeve 22 is used to fix the height and center position of the embedded pile 1.

[0071] The wall protection sleeve 4 is completely placed in the borehole and is a certain distance below the ground surface, and the outer sleeve 21 is placed in the distance space. The height of the outer sleeve 21 is greater than the height of the distance space, so the first part of the outer sleeve 21 is located in the borehole, and the second part extends out of the borehole and is a certain distance above the ground surface. The lower edge of the outer sleeve 21 contacts the upper edge of the top of the wall protection sleeve 4, and the outer sleeve 21 is supported and fixed by the wall protection sleeve 4 fixed in the hole. Therefore, the height of the first part is the distance between the ground surface and the lower edge of the outer sleeve 21; the height of the second part is the distance between the ground surface and the upper edge of the outer sleeve 21.

[0072] Since both the outer sleeve 21 and the inner sleeve 22 are hollow inner sleeves, cement slurry can be injected into the annular gap formed between the inner wall of the outer sleeve 21 and the outer wall of the inner sleeve 22, and the injection height of the cement slurry is controlled to be the same as the height of the wall protection sleeve 4, so that the solidified grouting layer is not physically connected to the outer sleeve 21 above the wall protection sleeve 4. The outer sleeve 21 and the wall protection sleeve 4 are concentrically arranged and have the same inner diameter, and the lower edge of the outer sleeve 21 just abuts against the upper edge of the wall protection sleeve 4. The hollow inner cavity of the inner sleeve 22 allows the embedded pile 1 to pass through the inner sleeve 22 from top to bottom, and continue to extend downward into the wall protection sleeve 4 below it.

[0073] Among them, the inner diameter of the inner sleeve 22 is the same as the outer diameter of the embedded pile 1, so that the inner wall of the inner sleeve 22 is in close contact with the outer wall of the embedded pile 1, thereby limiting the shaking and displacement of the embedded pile 1 in the inner sleeve 22. Therefore, the shape of the inner sleeve 22 ensures that the embedded pile 1 can be vertically inserted into the wall protection sleeve 4 and be concentric and coaxial with the wall protection sleeve 4.

[0074] In this embodiment, at least one notch 211 is provided on the second portion of the outer sleeve 21 that is above the ground, and at least one supporting wing 23 is provided on the outer side of the inner sleeve 22, and the number and position of the supporting wing 23 correspond to the number and position of the notch 211 on the outer sleeve 21. When the supporting wing 23 of the inner sleeve 22 is engaged with the notch 211 of the outer sleeve 21, the supporting wing 23 will be fixed in the notch 211, thereby locking the relative position between the inner and outer sleeves. Since the outer sleeve 21 is limited and fixed by the drill hole, the inner sleeve 22 is locked by the outer sleeve 21 to ensure that the first positioning part 2 will not move or deviate in the drill hole, and then the embedded pile 1 therein is locked by the fixed inner sleeve 22. Therefore, the embedded pile 1 is accurately positioned by the clamping of the inner and outer sleeves, coaxial with the wall protection sleeve 4, and the circumferential deviation of the embedded pile 1 is limited to ensure its verticality; and the second positioning part 3 is clamped to the inner sleeve 22 to further ensure that the embedded pile 1 always maintains the middle position, and the sinking of the embedded pile 1 is limited to ensure its vertical height.

[0075] In some embodiments, a plurality of notches 211 are arranged in an array at uniform intervals along the circumference of the outer sleeve 21. Preferably, four notches 211 are provided, and every two of the four notches 211 are arranged adjacent to each other at an angle of 90°.

[0076] In some embodiments, the height of the notch 211 can be less than or equal to the height of the second part of the outer sleeve 21, that is, when the height of the notch 211 is less than the second part, the notch 211 is higher than the ground surface, so the support wing 23 also has a distance from the ground surface; when the height of the notch 211 is equal to the second part, the lower edge of the notch 211 is flush with the ground surface, so the support wing 23 just passes through the notch 211 and is supported on the ground surface.

[0077] In some embodiments, the length of the support wing 23 may be equal to or greater than the distance between the outer sleeve 21 and the inner sleeve 22. That is, the support wing 23 is just snapped into the notch 211, or the support wing 23 horizontally passes through the notch 211 and continues to extend for a distance.

[0078] In some embodiments, the support wing 23 may be in a straight line shape, extending horizontally from the inner sleeve 22 toward the notch 211 , and snapped into the notch 211 .

[0079] In some embodiments, the height of the inner sleeve 22 may be less than or equal to the height of the outer sleeve 21 .

[0080] Preferably, the notch 211 passes through the second part of the outer sleeve 21, and each supporting wing 23 is L-shaped; wherein the transverse section 231 of the L-shaped supporting wing extends horizontally out of the notch 211, and the upper edge of the transverse section 231 is flush with the upper edge of the notch 211, and the lower edge of the transverse section 231 is flush with the lower edge of the notch 211; wherein the vertical section 232 of the L-shaped supporting wing extends axially, and the upper edge of the vertical section 232 is flush with the lower edge of the transverse section 231, and the lower edge of the vertical section 232 is flush with the lower edge of the inner sleeve 22; wherein the upper edge of the outer sleeve 21 is flush with the upper edge of the outer sleeve 21, and the lower edge of the outer sleeve 21 is flush with the lower edge of the inner sleeve 22; the outer edge of the vertical section 232 contacts the inner wall of the outer sleeve 21.

[0081] In this embodiment, the notch 211 penetrates the second part of the outer sleeve 21 horizontally and axially at the same time, that is, the height of the notch 211 is equal to the height of the second part, and it is a through hole, so the second part of the outer sleeve 21 extending out of the drill hole is fully utilized, and the second part provides a position for installing and locking the support wings 23. The inner sleeve 22 with the support wings 23 can be installed in the outer sleeve 21 from top to bottom until the support wings 23 are clamped on the notch 211 from top to bottom and contact the ground surface at the same time.

[0082] The support wing 23 is formed into an L shape by combining a horizontal section 231 and a vertical section 232. The horizontal section 231 is snapped into the notch 211, and the height of the horizontal section 231 is the same as the height of the notch 211, so that the support wing 23 fits tightly with the notch 211. During the construction process, the horizontal section 231 extends out of the notch 211 similar to a support ear, which can not only use the support force of the ground surface to enhance the stability of the inner sleeve 22, further ensure that the inner sleeve 22 will not sink due to the axial pressure of the embedded pile 1, but also facilitate the construction personnel to take the inner sleeve 22.

[0083] The vertical section 232 is located between the first part of the outer sleeve 21 and the inner sleeve 22. The vertical section 232 is integrally formed with the horizontal section 231, and the vertical section 232 is clamped between the outer sleeve 21 and the inner sleeve 22. Therefore, when the inner sleeve 22 is subjected to the axial pressure of the embedded pile 1, it is ensured that the inner sleeve 22 can be firmly clamped on the outer sleeve 21. At the same time, the clamping force of the vertical section 232 limits the horizontal displacement of the horizontal section 231 relative to the notch 211, thereby enhancing the stability of the entire positioning mechanism.

[0084] Preferably, when the vertical segment 232 is located between the first part of the outer sleeve 21 and the inner sleeve 22, the outer edge of the vertical segment 232 contacts the inner wall of the outer sleeve 21, that is, the length of each vertical segment 232 is the same as the distance between the outer sleeve 21 and the inner sleeve 22, so as to enhance the fixing effect between the inner and outer sleeves.

[0085] In this embodiment, the inner and outer sleeves have the same height and are flush with each other, and are aligned in the axial direction.

[0086] In another embodiment, the inner sleeve 22 is configured as a split structure. The inner sleeve 22 may be composed of a plurality of detachable parts, and one or more supporting wings 23 may be provided on each part. For example, for a cylindrical inner sleeve 22, it is divided into a plurality of arc plates, and the plurality of arc plates are combined to form an inner sleeve 22 with a hollow interior. Since the plurality of arc plates are axially fixed by the transverse section 231 of the supporting wing 23, and radially fixed by the vertical section 232, when the plurality of arc plates are installed in the outer sleeve 21 and combined to form the inner sleeve 22, the stability of the inner sleeve 22 can be ensured without providing additional connecting parts. Therefore, the split design of the inner sleeve 22 makes the device more flexible during installation and disassembly, and improves the construction efficiency.

[0087] like Figure 5 As shown, Figure 5 The schematic diagram of the split structure of the inner sleeve is shown. In this embodiment, the inner sleeve 22 includes a first mounting portion 221 and a second mounting portion 222, which are separated and symmetrical. The first mounting portion 221 and the second mounting portion 222 are both provided with two supporting wings 23; and the first mounting portion 221 and the second mounting portion 222 are spliced ​​into the inner sleeve 22 with a positioning hole, and the embedded pile 1 passes through the positioning hole.

[0088] Specifically, the first mounting portion 221 and the second mounting portion 222 are semicircular plates respectively, which are assembled and combined into the inner sleeve 22. After the embedded pile 1 passes through the outer sleeve 21 and extends into the wall protection sleeve 4 for a distance, the first mounting portion 221 and the second mounting portion 222 are combined and installed in the outer sleeve 21, so that the combined positioning hole is aligned to surround the embedded pile 1, and then the embedded pile 1 is further lowered until the second positioning portion 3 on the embedded pile 1 is snapped onto the inner sleeve 22. Through the detachable assembly, the construction personnel can flexibly install according to actual needs, and ensure the center position of the embedded pile 1 through the positioning hole, which greatly improves the construction accuracy and efficiency.

[0089] In combination with the above embodiments, the second positioning portion 3 is a steel sheet, and the steel sheet abuts against the upper edge of the inner sleeve 22. In this embodiment, the thickness of the steel sheet is greater than the wall thickness of the inner sleeve 22, so when the steel sheet contacts the upper edge of the inner sleeve 22, the embedded pile 1 can be positioned on the inner sleeve 22. Preferably, the steel sheet is a square high-strength steel sheet with high strength and wear resistance, ensuring that the embedded pile 1 will not be loosened and sink under the action of external pressure (such as pile body load or grouting pressure).

[0090] In this embodiment, the bottom of the embedded pile 1 can be connected to the steel cage 6. When placing the embedded pile 1 in the drilled hole, first put the bottom portion with the steel cage 6 tied to it into the wall protection sleeve 4, and after the steel cage 6 at the bottom is completely inserted into the wall protection sleeve 4, the first mounting portion 221 and the second mounting portion 222 of the inner sleeve 22 are respectively inserted into the notch 211 of the outer sleeve 21 to complete the splicing of the inner sleeve 22, and then continue to bury the embedded pile 1 downward into the wall protection sleeve 4 until the steel sheet on the embedded pile 1 abuts against the upper edge of the inner sleeve 22. At this time, the embedded pile 1 has reached the designed burial depth and will no longer sink under the vertical support of the reinforcing steel sheet and the horizontal positioning of the first positioning portion 2.

[0091] In a further technical solution, the device further comprises a column 5, one end of which is inserted into the embedded pile 1 and fixed to the embedded pile 1 by bolts; wherein the bolts are located on the steel sheet. In this embodiment, one end of the column 5 is inserted into the embedded pile 1 and fixed to the embedded pile 1 by bolts, ensuring a stable connection between the column 5 and the pile body, so as to serve as a basis for subsequent support measures.

[0092] As a specific explanation of this embodiment, the column 5 can be installed on the embedded pile 1 during the construction process. It is also possible to install the column 5 on the embedded pile 1 by bolts after the construction is completed when the column 5 needs to be installed.

[0093] When installing the column 5 during construction, the position of the bolt can be shared with the position of the steel sheet so that the bolt and the steel sheet are at the same height. Therefore, when the steel sheet plays a positioning role, the bolt also engages with the upper edge of the inner sleeve 22 to assist the steel sheet in positioning.

[0094] Preferably, the two bolts are symmetrically distributed on opposite sides of the embedded pile 1 , and cooperate with the steel sheet to fix the center position and vertical height of the embedded pile 1 , and can also be used to fix the column 5 after the embedded pile 1 is positioned.

[0095] Among them, the column 5 located at the upper part is usually set to support the slope displacement monitoring device, power equipment (telephone poles, signal towers, photovoltaic solar panels) and slope support structure (retaining wall, anchor piles) on the granular slope.

[0096] As an improvement of another embodiment, Figure 6The three-dimensional structural schematic diagram of the wall protection sleeve is shown. A plurality of through holes 41 are provided on the wall protection sleeve 4. When pouring concrete into the drilled hole, it can be poured from the annular gap between the outer sleeve 21 and the inner sleeve 22 of the first positioning part 2, and the concrete slurry injected by high-pressure pouring can seep out through the holes provided on the wall protection sleeve 4 under the action of pressure. The plurality of through holes 41 on the wall protection sleeve 4 can act as grouting channels, so that the grouting material can flow evenly into the gap between the pile body and the surrounding soil through these channels, and the grouting liquid penetrates into the soil layer to form a pile-soil community, thereby enhancing the bonding force between the pile body and the surrounding soil, and improving the grouting effect and the bearing capacity of the pile body.

[0097] Therefore, a high-strength and porous wall protection sleeve 4 is designed as a wall protection device, which not only solves the problem of easy collapse of drilling holes on loose gravel soil layers, but also increases the friction between concrete and gravel soil layers, thereby improving the anti-overturning and anti-pullout capabilities of the embedded piles 1.

[0098] The apertures, number and distribution of the plurality of through holes 41 can be reasonably arranged according to the designed length and diameter of the wall protection sleeve 4 and the content and fluidity of the required grouting material.

[0099] The following is an exemplary description of an embodiment of the present invention:

[0100] Please refer again Figure 6 The material of the wall protection sleeve 4 is a high-strength steel pipe, with a wall thickness of a, a of 5 mm, a height of H, which is consistent with the pouring height of the concrete, and an outer diameter of D1, which is consistent with the borehole diameter. The diameter of the through hole 41 set on the outer wall of the wall protection sleeve 4 is 1-2 cm, and the number of the through holes 41 is calculated based on the ratio of the area of ​​the through hole 41 to the area of ​​the steel pipe wall, and the ratio of the two is set between 1 / 3 and 1 / 2.

[0101] Please refer again Figure 2 , Figure 3 and Figure 4 The inner sleeve 22 and the outer sleeve 21 are both made of steel, and the wall thickness of the inner and outer sleeves is a, which is consistent with the wall thickness of the wall protection sleeve 4; the height of the outer sleeve 21 is h, and its outer diameter is D1, which is consistent with the outer diameter of the wall protection sleeve 4. Four symmetrically distributed notches 211 with a height of h / 3 are set on the top of the outer sleeve 21, and the width of the notch 211 is a, which is consistent with the wall thickness of the outer sleeve 21; the height of the inner sleeve 22 is h, which is consistent with the outer sleeve 21, and it is composed of two symmetrical parts spliced ​​together, and the inner diameter after the combination is D2, which is exactly consistent with the outer diameter of the embedded pile 1.

[0102] Please refer again Figure 5The outer wall of the inner sleeve 22 is symmetrically welded with four L-shaped flat steel support wings. The height of the horizontal section 231 of the support wing 23 is h / 3, and the wing length is between (D1-D2) / 3 and (D1-D2) / 2. The height of the vertical section 232 is 2h / 3, and the wing length is (D1-D2) / 2-2a, which is exactly the distance between the outer wall of the inner sleeve 22 and the inner wall of the outer sleeve 21. The thickness of the support wing 23 is a, which is consistent with the width of the notch 211 of the outer sleeve 21.

[0103] When placing the outer sleeve 21 into the borehole, the notch 211 part (i.e. the h / 3 part of the outer sleeve 21) is reserved above the ground surface, 2h / 3 of the outer sleeve 21 is buried below the ground surface, and the bottom of the outer sleeve 21 just contacts the top of the wall casing 4.

[0104] The positions of the steel sheet and bolts on the embedded pile 1 are determined by the designed embedding depth H' of the embedded pile 1, and the height between the bottom edge of the steel sheet and the bottom edge of the embedded pile 1 is H'+h / 3.

[0105] See also Figure 7 , Figure 7 The flowchart of the method for fixing the granular microporous cast pre-buried piles of the present invention is shown. The method relies on a granular microporous cast pre-buried pile fixing device provided by the present invention for fixing. The fixing method includes the following steps:

[0106] S1. According to the location of the borehole on the granular soil slope, bury the wall casing 4 in the borehole;

[0107] S2, placing the first positioning portion 2 above the wall protection sleeve 4;

[0108] S3, based on the preset height required for burying the pre-buried pile 1, fixing the second positioning portion 3 at the preset position of the pre-buried pile 1;

[0109] S4, passing the embedded pile 1 fixed with the second positioning part 3 through the positioning mechanism from top to bottom and entering the wall protection sleeve 4;

[0110] S5, when the second positioning portion 3 on the embedded pile 1 is engaged with the first positioning portion 2, the embedded pile 1 is positioned on the wall protection sleeve 4;

[0111] S6, pouring grouting material between the wall sleeve 4 and the embedded pile 1, and stopping pouring when the grouting material reaches below the first positioning portion 2;

[0112] S7, after the grouting material is solidified to obtain a grouting layer, the first positioning part 2 is taken out, and the microporous grouting pre-buried pile fixation of the granular soil slope is completed.

[0113] As for the method embodiment, since it is basically similar to the device embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the device embodiment.

[0114] In combination with the above embodiments, taking a specific device embodiment as an example, the method embodiment provided by the present invention is further described:

[0115] A method for fixing granular microporous cast-in-place embedded piles comprises the following steps:

[0116] (1) Use a drilling rig to drill holes according to the designed pile diameter and depth, and use an air compressor to clean the gravel at the bottom of the hole after the hole is drilled;

[0117] (2) After the drilling rig has completed the hole cleaning, a wall protection casing 4 is immediately placed in the hole to prevent the hole from collapsing due to construction disturbance. The height of the wall protection casing 4 is consistent with the designed grouting height;

[0118] (3) The outer sleeve 21 is stacked on top of the wall protection sleeve 4, and the notch 211 of the outer sleeve 21 is reserved above the ground surface;

[0119] (4) Two reinforcing steel sheets are arranged above the ground surface of the embedded pile 1. The reinforcing steel sheets are symmetrically distributed on both sides of the embedded pile 1. High-strength bolts are arranged on the reinforcing steel sheets. A steel cage 6 is welded and tied to the bottom of the embedded pile 1.

[0120] (5) The embedded pile 1 with the steel cage 6 is passed through the outer sleeve 21 and placed into the wall protection sleeve 4. When the embedded pile 1 is lowered to the designed depth, the first mounting portion 221 and the second mounting portion 222 of the inner sleeve 22 are combined and inserted into the notch 211 of the outer sleeve 21. The four flat steel support wings of the inner sleeve 22 are just reserved above the ground surface. The embedded pile 1 is continued to be lowered until the reinforcing steel sheet and high-strength bolts on the embedded pile 1 just abut against the upper edge of the inner sleeve 22. Under the joint support of the high-strength bolts and the inner sleeve 22 with the support wings 23, the embedded pile 1 no longer sinks. The inner wall of the outer sleeve 21 is in close contact with the flat steel support wings to play a supporting role, and the inner wall of the inner sleeve 22 is in close contact with the outer wall of the embedded pile 1 to play a straightening and positioning role.

[0121] (6) After the embedded pile 1 and the steel cage 6 are successfully positioned, the column 5 is fixed to the embedded pile 1 by high-strength bolts;

[0122] (7) pouring concrete into the wall protection sleeve 4, and stopping pouring when the concrete pouring height reaches the lower edge of the outer sleeve 21;

[0123] (8) After the grouting is completed, concrete curing is carried out. First, the high-strength bolts are screwed out, and then the first mounting portion 221 and the second mounting portion 222 of the inner sleeve 22 are taken out respectively. Finally, the outer sleeve 21 is taken out. After the first positioning portion 2 is taken out, the surface soil is backfilled to restore the ground elevation to the original elevation.

[0124] (9) The removed first positioning portion 2 is ready for next recycling.

[0125] In summary, the method for fixing the granular soil slope by using the granular microporous cast-in-place embedded pile fixing device provided by the present invention can ensure that the verticality, reserved height and center position of the embedded pile 1 are not offset. The wall protection sleeve 4 used at the same time can prevent the hole collapse caused by drilling on the granular slope. At the same time, the through hole 41 on the wall protection sleeve 4 ensures that during grouting, the concrete slurry flows out of the hole under pressure and fully contacts with the soil layer, increases the bonding force between the concrete and the soil, and improves the friction force on the pile side, thereby improving the pull-out and anti-overturning performance of the upper structure foundation. At the same time, during the construction process, the device has the properties of being detachable, reusable, and easy to operate, which solves the problems of easy hole collapse of conventional microporous cast-in-place piles, inaccurate positioning of embedded piles, insufficient verticality, poor grouting molding quality, low pull-out and anti-overturning capabilities, and substandard height of the upper structure support.

[0126] It should be noted that, for the method embodiments, for the sake of simplicity, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the embodiments of the present application are not limited by the described order of actions, because according to the embodiments of the present application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions involved are not necessarily required by the embodiments of the present application.

[0127] As for the method embodiment, since it is basically similar to the system embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0128] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0129] It should also be noted that, in this article, the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations, nor can they be understood as indicating or implying relative importance. Moreover, the term "include" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device.

[0130] The above is a detailed introduction to a granular microporous cast-in-place embedded pile fixing device and method provided by the present application. The principles and implementation methods of the present application are described in detail in this article using specific examples. The description of the above embodiments is only used to help understand the present application, and the content of this specification should not be understood as a limitation on the present application. At the same time, for a person of ordinary skill in the art, according to the present application, there will be different forms of changes in the specific implementation methods and application scopes. It is not necessary and impossible to list all the implementation methods here, and the obvious changes or modifications derived therefrom are still within the protection scope of the present application.

Claims

1. A granular microporous cast-in-place embedded pile fixing device, characterized in that: The device includes: Wall casing, used for burying in the borehole; A pre-buried pile, one end of which is inserted into the wall protection casing and the other end of which extends out of the drill hole; A grouting layer is filled in the gap between the wall protection casing and the embedded pile; A positioning mechanism, allowing the embedded pile to pass through and positioning the embedded pile on the wall protection sleeve so that the central axis of the embedded pile is in line with the central axis of the wall protection sleeve; The positioning mechanism includes a first positioning portion and a second positioning portion, and the first positioning portion and the second positioning portion are clamped; wherein the first positioning portion is located above the wall protection sleeve; the second positioning portion is arranged at a preset position of the embedded pile, so that when the second positioning portion is in a clamped state, the portion of the embedded pile located in the wall protection sleeve is at a preset height; The first positioning portion comprises: An outer sleeve, at least a first portion of which is located in the borehole and contacts the upper edge of the wall protection sleeve, and a remaining second portion of which extends out of the borehole; An inner sleeve, which is sleeved inside the outer sleeve and allows the embedded pile to extend axially through the inner sleeve; At least one notch is formed in the area of ​​the outer sleeve corresponding to the second part, and at least one supporting wing is arranged on the outer wall of the inner sleeve, and a plurality of supporting wings are correspondingly engaged in the plurality of notches.

2. A granular microporous cast-in-place embedded pile fixing device according to claim 1, characterized in that: The notch passes through the second portion of the outer sleeve, and each of the support wings is L-shaped; The transverse section of the L-shaped supporting wing extends horizontally out of the notch, and the upper edge of the transverse section is flush with the upper edge of the notch, and the lower edge of the transverse section is flush with the lower edge of the notch; Wherein, the vertical section of the L-shaped supporting wing extends axially, and the upper edge of the vertical section is flush with the lower edge of the horizontal section, and the lower edge of the vertical section is flush with the lower edge of the inner sleeve; The upper edge of the outer sleeve is flush with the upper edge of the outer sleeve, and the lower edge of the outer sleeve is flush with the lower edge of the inner sleeve; the outer edge of the vertical section contacts the inner wall of the outer sleeve.

3. A granular microporous cast-in-place embedded pile fixing device according to claim 2, characterized in that: The inner sleeve is configured as a split structure.

4. A granular microporous cast-in-place embedded pile fixing device according to claim 3, characterized in that: The inner sleeve comprises a first mounting portion and a second mounting portion which are symmetrical to each other, and the first mounting portion and the second mounting portion are both provided with two supporting wings; and The first mounting portion and the second mounting portion are spliced ​​into the inner sleeve having a positioning hole, and the embedded pile passes through the positioning hole.

5. A granular microporous cast-in-place pre-buried pile fixing device according to any one of claims 1 to 4, characterized in that: The second positioning portion is a steel sheet, and the steel sheet abuts against the upper edge of the inner sleeve.

6. A granular microporous cast-in-place embedded pile fixing device according to claim 5, characterized in that: The device further comprises a column, one end of which is inserted into the pre-buried pile and fixed to the pre-buried pile by bolts; wherein the bolts are located on the steel sheet.

7. The granular microporous cast-in-place embedded pile fixing device according to claim 1 is characterized in that: The bottom of the embedded pile located in the wall protection sleeve is connected with a steel cage.

8. The granular microporous cast-in-place embedded pile fixing device according to claim 1 is characterized in that: The wall protection sleeve is provided with a plurality of through holes.

9. A method for fixing granular microporous cast-in-place pre-buried piles, characterized in that: The fixing method is based on the granular microporous cast-in-place embedded pile fixing device according to any one of claims 1 to 8, and the fixing method includes: According to the location of the borehole on the granular soil slope, the wall casing is buried in the borehole; Placing the first positioning portion above the wall protection sleeve; Based on a preset height required for burying the pre-buried pile, fixing the second positioning portion at a preset position of the pre-buried pile; Pass the embedded pile with the second positioning part fixed thereon through the positioning mechanism from top to bottom and enter into the wall protection sleeve; When the second positioning part and the first positioning part on the embedded pile are engaged, the embedded pile is positioned on the wall protection sleeve; pouring grouting material between the wall protection sleeve and the embedded pile, and stopping pouring when the grouting material reaches below the first positioning portion; After the grouting material is solidified to obtain a grouting layer, the first positioning portion is taken out to complete the fixation of the microporous cast-in-place embedded piles of the granular soil slope.

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