High polymer micro pile grouting device and method for slope reinforcement

Abstract

The invention discloses a high polymer micro pile grouting device and method for slope reinforcement, the grouting device comprises a micro pile and a grouting pipe, the grouting pipe is spiral, grouting holes are formed in the grouting pipe, the grouting pipe axially comprises a plurality of grouting sections, the hole diameters and the intervals of the grouting holes in the grouting sections are different, and the grouting sections are communicated with the micro pile. The grouting pipe is arranged in the micro pile in a sleeved mode, and a through hole corresponding to the grouting hole is formed in the micro pile. The method comprises the following steps that geological exploration is conducted on a to-be-grouted area; designing a grouting pipe according to the obtained information; grouting pipes are pre-buried in the micro piles; grouting is conducted in the grouting pipe through the top of the grouting pipe, and grout enters the peripheral soil body of the micro pile along the grouting hole and the through hole in the micro pile; a dense grouting area is formed after the grouting material is solidified; the problems that a traditional micro pile is uneven in grouting and insufficient in local bearing capacity can be effectively solved, and the method has the advantages of being convenient to construct, even in grouting effect and high in adaptability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of slope reinforcement, and in particular to a high polymer micro pile grouting device and method for slope reinforcement. BACKGROUND

[0002] Micro piles are small-diameter piles developed from root piles, with a diameter of usually 0.1-0.3 m. They are usually constructed by cast-in-situ drilling, and have the advantages of flexible arrangement, small drilling, small construction site occupation, small construction machinery, and economy and environmental protection.

[0003] Traditional micro pile grouting technology generally uses a single-hole grouting pipe to inject grouting materials (such as cement slurry, chemical slurry, etc.) into the soil layer around the micro pile. However, in actual application, single-hole grouting often has problems such as uneven grouting, limited slurry diffusion range, and insufficient local bearing capacity, especially in complex geological conditions such as soft soil layer, fractured rock layer, or soft and hard alternating stratum, the slurry is difficult to fully penetrate into the target area, resulting in poor reinforcement effect. This is mainly due to the single hole of the grouting pipe limiting the diffusion range of the slurry, causing the slurry to react only in a part of the area around the micro pile, thereby affecting the reinforcement effect of the entire pile foundation. Especially in layered and uneven stratum, the slurry is easy to flow away along the dominant channel, resulting in uneven reinforcement effect, and the measured bearing capacity dispersion coefficient is as high as 30%-40%. Patent No. CN119880733A, a high polymer grouting waterproof test device, is mainly used for detecting the waterproof performance of grouting materials. It does not give technical inspiration for improving the bearing capacity and stability of micro piles.

[0004] Traditional technology uses uniform grouting pressure, flow rate and slurry ratio, which cannot be dynamically adjusted for different soil layers (such as soft soil, sand layer, fracture zone), resulting in poor reinforcement effect in strata with large differences in permeability. In high-pressure water-rich layers or fractured rock masses, the slurry is easy to be diluted by groundwater or flow away along the fractures, making it difficult to form an effective solidified body, and even may cause slurry pollution problems.

[0005] Due to the limitation of the structure of the grouting pipe, the effective utilization rate of the slurry in the prior art is generally less than 60%. In the stratum with developed fractures, the slurry loss rate can be more than 40%, which not only causes material waste, but also may pollute the groundwater environment; the traditional grouting hole is easy to be blocked by mud or sediment, which needs to be cleaned frequently, affecting the construction efficiency; at the same time, the poor sealing of the hole causes the slurry to flow back, further reducing the grouting effect. SUMMARY

[0006] The purpose of the present application is to provide a high polymer micro pile grouting device and method for slope reinforcement, which solves the problems of uneven grouting and insufficient slurry penetration in existing grouting technology under complex geological conditions.

[0007] The present application is achieved in that the present application provides a polymer micro pile grouting device for slope reinforcement, which comprises a micro pile and a grouting pipe, the grouting pipe is spiral-shaped, the grouting pipe is provided with grouting holes, the grouting pipe is axially provided with a plurality of grouting sections, the grouting holes on the grouting sections are different in diameter and spacing, the grouting pipe is sleeved in the micro pile, and the micro pile is provided with through holes corresponding to the grouting holes.

[0008] By arranging the multi-hole grouting pipe inside the micro pile and adjusting the grouting holes in layers, it can be ensured that the slurry is uniformly penetrated into the surrounding soil from different positions and depths. Compared with the traditional single-hole grouting process, it can effectively avoid the slurry being concentrated in a certain layer or position during the grouting process, ensure a larger range of soil reinforcement, and enhance the bearing capacity and stability of the pile foundation. At the same time, the spiral-shaped grouting pipe can avoid uneven distribution of the slurry in the soil layer, reduce the problem of local reinforcement or excessive grouting, and make the soil reinforcement more comprehensive and stable. The design of the multi-hole grouting pipe can ensure uniform diffusion and penetration of the slurry in the soil layer, improve the utilization rate of the slurry, and avoid the waste caused by too fast upward or lateral diffusion of the slurry in the traditional single-hole grouting. The present application can avoid the need for re-reinforcement due to uneven grouting or insufficient bearing capacity, thereby reducing the cost of rework and secondary construction.

[0009] A further technical solution of the present application is that the grouting holes are at least one of spiral-shaped, annular or axially arranged, so as to ensure uniform diffusion of the slurry.

[0010] A further technical solution of the present application is that the grouting holes are circular or elliptical, so as to optimize the flow and diffusion path of the slurry.

[0011] A further technical solution of the present application is that the grouting holes are convex or concave in the outer periphery, so as to reduce the risk of orifice blockage.

[0012] A further technical solution of the present application is that the spiral angle of the grouting pipe is 15°-30°, so as to ensure uniform diffusion of the slurry around the pile.

[0013] The present application also provides a polymer micro pile grouting method for slope reinforcement, which is based on the grouting device and comprises the following steps:

[0014] S1, geological exploration is performed on the area to be grouted to obtain the type, permeability and bearing capacity information of the soil layer;

[0015] S2, the grouting pipe is designed according to the information obtained in S1;

[0016] S3, the grouting pipe is pre-buried in the micro pile, and the position of the grouting pipe is ensured to be accurate by the fixing member;

[0017] S4, grouting is carried out in the micro pile through the top of the grouting pipe, and the slurry enters the peripheral soil of the micro pile along the grouting hole and the through hole on the micro pile;

[0018] S5, the grouting material is solidified to form a dense grouting area.

[0019] The application can effectively overcome the problems of uneven grouting and insufficient local bearing capacity of traditional micro piles, and has the advantages of convenient construction, uniform grouting effect, strong adaptability and the like.

[0020] Further technical solutions of the application are that in the case that the information obtained in step S1 judges that the geology is a water-rich layer, a polyurethane quick-setting agent is injected before grouting to block the seepage channel; in the case that the geology is a fracture zone, an intermittent grouting process is adopted, that is, grouting and stopping are alternately performed to avoid excessive loss of slurry; and in the case that the geology is a soft and hard alternating layer, the grouting pressure and the grouting speed are dynamically adjusted to adapt to the needs of different soil layers.

[0021] Further technical solutions of the application are that in the case that the geology is a soft soil layer, the grouting hole on the grouting pipe has a larger hole diameter than the hard layer and a denser hole spacing than the hard layer.

[0022] The application can cope with different soil layer types under complex geological conditions, including soft soil layers, rock layers, clay, expansive soil and the like. By adjusting the spacing of the grouting holes and the design of the grouting pipe hole diameter, the slurry type and the grouting process can be adjusted according to the permeability, particle size and soil strength of different soil layers, so as to ensure that the slurry can penetrate deeply and form an effective reinforcement effect. And the multi-hole grouting pipe can set grouting holes at different depths and positions, adjust the diffusion path of the slurry according to the change of the soil layer, and ensure that each layer can be effectively reinforced in the complex soil layer structure.

[0023] The application has the following beneficial effects: by arranging the multi-hole grouting pipe in the micro pile and adjusting the grouting holes in layers, the slurry can be uniformly penetrated into the surrounding soil from different positions and depths. Compared with the traditional single-hole grouting process, the slurry can be effectively prevented from being concentrated in a certain layer or position during grouting, so as to ensure a larger range of soil reinforcement and enhance the bearing capacity and stability of the pile foundation. At the same time, the spiral grouting pipe can avoid uneven distribution of the slurry in the soil layer, reduce the problem of local reinforcement or excessive grouting, and make the soil reinforcement more comprehensive and stable. The design of the multi-hole grouting pipe can ensure the uniform diffusion and penetration of the slurry in the soil layer, improve the utilization rate of the slurry, and avoid the waste caused by the too fast upward or lateral diffusion of the slurry in the traditional single-hole grouting.

[0024] This invention can handle various soil types under complex geological conditions, including soft soil, rock, clay, and expansive soil. By adjusting the spacing of the grouting holes and the design of the grouting pipe diameter, the type of grout and the grouting process can be adjusted according to the permeability, particle size, and soil strength of different soil layers, ensuring that the grout can penetrate deeply and form an effective reinforcement effect. Furthermore, the porous grouting pipe allows for the placement of grouting holes at different depths and locations, adjusting the grout diffusion path according to changes in soil layers, ensuring effective reinforcement of each layer in complex soil structures.

[0025] Because the grouting effect is more uniform and stable, it can avoid the need for reinforcement due to uneven grouting or insufficient load-bearing capacity, thereby reducing the cost of rework and secondary construction. Attached Figure Description

[0026] Fig. 1 This is a schematic diagram of the structure of a polymer micropile grouting device for slope reinforcement provided by the present invention;

[0027] Fig. 2 This is a schematic diagram of the grouting pipe structure.

[0028] Attached reference numerals: 1. Grouting pipe, 2. Grouting hole, 3. Grouting section, 4. Micropile. Detailed Implementation

[0029] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0030] Example 1:

[0031] like Figs. 1-2 The grouting device shown includes: micropile 4; a porous grouting pipe 1 pre-embedded in the micropile 4, the porous grouting pipe 1 being arranged longitudinally along the micropile 4 and having multiple grouting sections 3 at different depths; each grouting section 3 having multiple grouting holes 2, the hole diameter, spacing and distribution of the grouting holes 2 being optimized according to the properties of the target soil layer; the porous grouting pipe 1 being made of corrosion-resistant, high-pressure resistant high-strength plastic or alloy steel to ensure the long-term durability of the grouting pipe 1 during construction.

[0032] In this embodiment, the grouting pipe 1 should be fixed in the designed position before the micropile 4 is constructed. Support frames, special fixing devices, or binding methods can be used to ensure that the pipe does not shift or deform during construction. During the concrete pouring or grouting process of the micropile 4, the grouting pipe 1 is pre-embedded in the pile. A pipe guiding device is used to ensure accurate pipe positioning and prevent shifting during construction.

[0033] In this embodiment, the grouting hole 2 is provided with an orifice seal, which includes a combination of a rubber grouting plug and an expansion sealing ring.

[0034] In this embodiment, the grouting pipe 1 is arranged in a spiral shape to ensure that the grout can be evenly diffused around the entire micropile 4. The distribution of the grouting holes 2 is selected according to the specific geological conditions. For example, in soft soil layers, a larger hole diameter and a denser spacing are required, while in hard soil layers, the opposite is true. Different hole distribution patterns can be used for different soil layers in the same construction. The top of the grouting pipe 1 is connected to the grouting pump interface, and a grout stop valve is installed at the bottom. The spiral angle is designed to be 15°-30° to ensure that the grout is evenly diffused around the pile.

[0035] In other embodiments, the grouting holes 2 are distributed in one or more combinations of spiral, annular, or axial arrangements. The holes can be arranged in a specific pattern along the axial and circumferential directions of the grouting pipe 1 to form a spiral distribution, annular distribution, or other optimized patterns to ensure uniform diffusion of the grout.

[0036] In this embodiment, for the location of weak or uneven soil layers, multiple grouting pipe sections 1 are set at different depths of the micropile 4, and each pipe section is equipped with multiple grouting holes 2. This ensures that soil layers at different depths can be effectively reinforced. Depending on different engineering requirements and soil characteristics, the arrangement of the grouting holes 2 can be adopted in different ways to ensure that the grout can be evenly diffused around the entire micropile 4. The number, diameter, and distribution of the grouting holes 2 can be flexibly optimized according to specific engineering requirements. Specifically, the diameter and spacing of the grouting holes 2 are dynamically adjusted according to the permeability and strength of the soil layer. Grouting is carried out layer by layer according to different geological layers. For example, a grouting layer is set in the soft soil layer, and another different grouting layer is set in the hard soil layer or gravel layer. The grouting holes 2 in the soft soil layer are densely distributed and have a larger diameter, while the grouting holes 2 in the hard soil layer are sparsely distributed and have a smaller diameter.

[0037] In other embodiments, the orifice shape of the porous grouting pipe 1 is circular, elliptical, or a special geometric shape to optimize the flow and diffusion path of the grout. The area around the orifice can be designed with small protrusions or depressions to reduce the risk of orifice blockage.

[0038] In this embodiment, the grouting device also includes an orifice seal, which is a combination of a rubber grout stop plug and an expansion sealing ring to prevent grout backflow.

[0039] This invention relates to a multi-hole grouting pipe 1 grouting technology. Compared to traditional single-hole grouting, the multi-hole grouting pipe 1, by setting multiple grouting holes 2 inside or around the micropile 4, can more evenly distribute the grout, improve the uniformity and depth of grouting, and ensure that the bond between the pile foundation and the soil is effectively enhanced. By setting multiple grouting holes 2 inside the micropile 4, the grout can be evenly diffused into the soil layer, significantly improving the bearing capacity and stability of the pile foundation, thereby effectively addressing the foundation reinforcement needs under complex geological conditions. This invention not only improves the uniformity and depth of grouting but also significantly enhances the application effect of the micropile 4 in complex soil layers such as soft strata, rock strata, and loose soil layers, and has broad engineering application prospects.

[0040] The grouting holes 2 in the porous grouting pipe 1 of this invention have diameters and spacings adapted to the needs of complex geological conditions; the grouting holes 2 in soft soil layers are densely distributed and have larger diameters, while those in hard soil layers are sparsely distributed and have smaller diameters. This invention can dynamically adjust grouting parameters and optimize grout diffusion paths for different soil layer characteristics, and is an efficient micropile 4 grouting device and construction technology adapted to complex geological conditions, thereby improving the overall reinforcement effect and engineering applicability of pile foundations.

[0041] Example 2:

[0042] A multi-hole grouting construction process for micropiles under complex geological conditions includes the following steps:

[0043] S1. Conduct geological exploration to obtain information on soil type, permeability, and bearing capacity; geological exploration to obtain information on soil type, soil permeability, bearing capacity, and groundwater level. Based on the characteristics of different soil layers, optimize the size and bearing capacity of micropiles 4, and determine the layout scheme of porous grouting pipes 1. Considering complex geological conditions, the pile foundation design should include the depth of grouting pipes 1, orifice distribution, grout type, and grouting pressure, etc.

[0044] S2. Based on the exploration results, design the layout scheme of the porous grouting pipe 1, including the depth of the grouting pipe 1, the distribution form of the grouting holes 2 and the type of grout.

[0045] S3. Embed the porous grouting pipe 1 into the micro pile 4 and ensure its accurate position through a fixing device.

[0046] S4. Inject grout through grouting pipe 1 in sections, ensuring that the grout spreads evenly and penetrates completely to the target depth during each grouting section;

[0047] S5. After the grouting material cures, it forms a dense grouting area, which enhances the bearing capacity and stability of the micropile 4.

[0048] In this embodiment, during construction in the water-rich layer, a polyurethane quick-setting agent is injected to seal the seepage channels before grouting. Seepage channels refer to paths in soil or rock layers, such as groundwater, that allow for relatively rapid and concentrated flow, and are naturally formed by geological conditions.

[0049] In this embodiment, during the construction of the fracture zone, an intermittent grouting process is adopted, that is, grouting and pausing are carried out alternately to avoid excessive loss of grout.

[0050] In this embodiment, during the construction of the soft-hard interlayer, the grouting pressure and grouting speed are dynamically adjusted to adapt to the needs of different soil layers.

[0051] In this embodiment, the slurry is a cement slurry or a chemical slurry, and its fluidity and curing time are adjusted according to the characteristics of the soil layer.

[0052] This invention belongs to the field of slope reinforcement technology, specifically relating to a multi-hole grouting device and construction process for micropiles 4 used on slopes with complex geological conditions. The grouting device includes micropiles 4, multi-hole grouting pipes 1 pre-embedded in the micropiles 4, and orifice sealing components. It aims to solve the problems of uneven grouting and insufficient penetration in traditional micropiles 4, improving the bearing capacity and stability of pile foundations in soft soil layers, rock layers, and uneven geological conditions. Specifically, the grouting pipes 1 are made of corrosion-resistant and high-pressure-resistant materials, and the orifice design is optimized to reduce the risk of blockage. The construction process includes geological exploration, pre-embedding of the grouting pipes 1, and layered grouting, and takes corresponding measures for special geological conditions such as water-rich layers and fractured zones, such as sealing with quick-setting agents and intermittent grouting. This invention has the advantages of uniform grouting, strong adaptability, and convenient construction, and can significantly improve the reinforcement effect of micropiles 4 in complex geological environments. The specific construction process includes: First, pre-embedding a multi-hole grouting pipe 1 inside the micropile 4, and driving the micropile 4 into the target stratum using drilling equipment; then, injecting grouting materials such as cement grout or chemical grout into the micropile 4 and surrounding soil through the grouting pipe 1, evenly distributing the grouting material at multiple orifices of the grouting pipe 1 to form a dense grouting area; finally, after the grouting material has solidified, the micropile 4 can provide stronger bearing capacity and deformation resistance under complex geological conditions. This invention can effectively overcome the problems of uneven grouting and insufficient local bearing capacity of traditional micropile 4, and has the advantages of convenient construction, uniform grouting effect, and strong adaptability.

[0053] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A polymer micropile grouting device for slope reinforcement, characterized in that: The grouting device includes a micropile (4) and a grouting pipe (1). The grouting pipe (1) is spiral-shaped and has grouting holes (2). The grouting pipe (1) includes multiple grouting sections (3) along its axis. The diameter and spacing of the grouting holes (2) on the grouting sections (3) are different. The grouting pipe (1) is fitted inside the micropile (4). The micropile (4) has through holes corresponding to the grouting holes (2).

2. The polymer micropile grouting device for slope reinforcement according to claim 1, characterized in that: The grouting holes (2) are arranged in at least one of the following shapes: spiral, annular, or axial.

3. The polymer micropile grouting device for slope reinforcement according to claim 2, characterized in that: The grouting hole (2) is circular or elliptical.

4. A polymer micropile grouting device for slope reinforcement according to claim 3, characterized in that: The grouting hole (2) has a raised or recessed outer periphery.

5. A polymer micropile grouting device for slope reinforcement according to any one of claims 1-4, characterized in that: The spiral angle of the grouting pipe (1) is 15°-30°.

6. A method for grouting polymer micropiles for slope reinforcement, characterized in that: The method is based on the grouting device according to any one of claims 1-5, and the method includes the following steps: S1. Conduct geological exploration of the area to be grouted to obtain information on soil type, permeability, and bearing capacity; S2. Design the grouting pipe based on the information obtained in S1; S3. Pre-embed the grouting pipe in the micropile and ensure the accurate position of the grouting pipe by using fixing components; S4. Grout is injected into the grouting pipe through the top of the grouting pipe. The grout enters the soil around the micropile along the grouting hole and the through hole on the micropile. S5. After the grouting material cures, a dense grouting area is formed.

7. A method for grouting polymer micropiles for slope reinforcement according to claim 6, characterized in that: If the information obtained in step S1 indicates that the geology is a water-rich layer, a polyurethane quick-setting agent is injected to seal the seepage channels before grouting; if the geology is a fractured zone, an intermittent grouting process is adopted, that is, grouting and pausing are alternated to avoid excessive loss of grout; if the geology is a soft-hard alternating layer, the grouting pressure and grouting speed are dynamically adjusted to adapt to the needs of different soil layers.

8. A method for grouting polymer micropiles for slope reinforcement according to claim 6, characterized in that: In step S2, when the geological condition is a soft soil layer, the diameter of the grouting holes on the grouting pipe is larger than that of the hard layer and the hole spacing is denser than that of the hard layer.

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