Soil body high-pressure grouting reinforcement method

Abstract

The invention relates to the technical field of soil body reinforcement, and discloses a soil body high-pressure grouting reinforcement method which comprises the following steps: drilling a hole in the ground at a construction position; the sleeve valve pipe extends into the groove hole, it is guaranteed that the grouting core pipe can be arranged in a cavity of the sleeve valve pipe in a penetrating mode, and segmented directional grouting reinforcement is conducted in the groove hole; the grouting core pipe is pulled out of the cavity, the injection pipe extends into the cavity till a spray head of the injection pipe is located at the bottom of the groove hole, high-pressure rotary jet grouting reinforcement is conducted in the groove hole, and high-pressure jet flow breaks through the sleeve valve pipe; and the injection pipe is pulled out of the slotted hole, and an orifice of the slotted hole is blocked. According to the method, firstly, segmented directional grouting is conducted in a slotted hole so as to preliminarily reinforce a soil body, the pressure intensity of sprayed slurry in the segmented directional grouting process is small, and disturbance to surrounding stratums is reduced; and then high-pressure jet grouting is carried out to further reinforce the soil body. Therefore, on the premise that the safety of the surrounding environment of the construction position is ensured, high-pressure grouting reinforcement can be conducted on the stratum soil body of the construction position.

Description

Technical Field

[0001] The invention relates to the technical field of soil reinforcement, and in particular to a soil high-pressure grouting reinforcement method. Background Art

[0002] In engineering practices such as subway tunnel excavation, deep foundation pit support, and reinforcement of existing building foundations, the mechanical properties and stability of soil play a decisive role in the safety and durability of the project. Since natural soil often has defects such as large porosity, low strength, high permeability, and unevenness, it is easy to cause engineering accidents such as foundation settlement, tunnel collapse, and foundation pit instability. Therefore, soil reinforcement is necessary.

[0003] One method is to reinforce the soil through grouting, which involves injecting a fluid and gelling slurry into the soil to fill soil pores, improve soil structure, increase soil strength, and reduce soil permeability, thereby increasing the soil's bearing capacity and stability. This meets the stringent requirements of engineering construction for soil performance, thereby ensuring the smooth implementation and long-term safe operation of the project. However, when encountering soil that requires high-pressure grouting, directly using high-pressure rotary jet grouting can easily cause significant disturbance to the strata surrounding the construction site. In areas where deformation control is required, this can easily cause problems such as ground uplift or deformation of surrounding buildings, posing a safety hazard.

[0004] Therefore, how to perform high-pressure grouting reinforcement on the stratum soil at the construction site while ensuring the safety of the environment around the construction site has become a technical problem that needs to be solved urgently in this field. Summary of the Invention

[0005] The purpose of the present invention is to at least solve the technical problem of how to perform high-pressure grouting reinforcement on the stratum soil at the construction site while ensuring the safety of the surrounding environment. This purpose is achieved through the following technical solutions:

[0006] In the first aspect, the present invention proposes a method for high-pressure grouting reinforcement of soil, comprising: step S100: drilling a hole in the ground at the construction site to generate a slot; step S200: extending the sleeve valve tube into the slot, and ensuring that the grouting core tube can pass through the cavity of the sleeve valve tube, and performing segmented directional grouting reinforcement in the slot through the grouting core tube and the sleeve valve tube; step S300: pulling the grouting core tube out of the cavity, extending the injection tube into the cavity until the nozzle of the injection tube is at the bottom of the slot, and performing high-pressure rotary grouting reinforcement in the slot through the injection tube, so that the high-pressure jet breaks through the sleeve valve tube; step S400: pulling the injection tube out of the slot to seal the opening of the slot.

[0007] This soil high-pressure grouting reinforcement method, after the slot is generated, first performs segmented directional grouting in the slot to provide a preliminary reinforcement of the ground at the construction site. Since the grouting pressure during the segmented directional grouting process is relatively low, it reduces the disturbance of the ground around the construction site to a certain extent. After the segmented directional grouting reinforcement is completed, the grouting core tube is pulled out of the cavity of the sleeve valve tube, and the injection tube is inserted into the cavity of the sleeve valve tube, followed by high-pressure rotary grouting to further reinforce the ground at the construction site. Therefore, this soil high-pressure grouting reinforcement method can also perform high-pressure grouting reinforcement on the ground at the construction site while ensuring the safety of the environment around the construction site.

[0008] In some embodiments of the present invention, step S100 specifically includes: step S101: generating a slot hole by following drilling with a steel casing; step S102: injecting casing material into the slot hole; step S103: pulling the steel casing out of the slot hole to form an accommodating space in the slot hole, and the accommodating space is the space in the slot hole where the steel casing was originally located.

[0009] In some embodiments of the present invention, in step S200, inserting the sleeve valve tube into the slot hole specifically includes: inserting the sleeve valve tube into the accommodating space.

[0010] In some embodiments of the present invention, step S200 specifically includes: step S201: preparing a sleeve valve pipe, a directional grouting equipment and a grouting core pipe, and the sleeve valve pipe is provided with a plurality of grouting holes at intervals along the extension direction of the sleeve valve pipe; step S202: connecting one end of the grouting core pipe to the directional grouting equipment, extending the sleeve valve pipe into the slot hole, and ensuring that the end of the grouting core pipe facing away from the directional grouting equipment can pass through the cavity of the sleeve valve pipe; step S203: starting the directional grouting equipment, aligning the slurry outlet holes of the grouting core pipe with different grouting holes on the sleeve valve pipe in turn, so that the slurry can be sprayed out from the corresponding grouting holes, thereby realizing segmented directional grouting reinforcement in the slot hole.

[0011] In some embodiments of the present invention, the directional grouting equipment includes a directional grouting bucket and a directional grouting pump; in step S203, starting the directional grouting equipment specifically includes: turning on the directional grouting pump to enable the directional grouting pump to supply the slurry in the directional grouting bucket to the grouting core pipe.

[0012] In some embodiments of the present invention, step S300 specifically includes: step S301: prepare a jet pipe and a high-pressure grouting equipment, connect one end of the jet pipe to the high-pressure grouting equipment, and provide a nozzle at the end of the jet pipe facing away from the high-pressure grouting equipment; step S302: extend the nozzle to the bottom of the slot hole, start the high-pressure grouting equipment, and make the jet pipe rotate around its own axis and gradually rise from the bottom of the slot hole to realize high-pressure rotary grouting reinforcement in the slot hole, so that the sleeve valve tube is broken by the high-pressure jet.

[0013] In some embodiments of the present invention, the high-pressure grouting equipment includes a high-pressure grouting barrel, a high-pressure grouting pump and an air compressor; in step S302, starting the high-pressure grouting equipment specifically includes: turning on the high-pressure grouting pump and the air compressor, the high-pressure grouting pump pressurizes the slurry in the high-pressure grouting barrel and supplies it to the injection pipe and finally flows to the nozzle, the air compressor supplies high-pressure air to the injection pipe and finally flows to the nozzle, the high-pressure air and the pressurized slurry are mixed in the injection pipe to form a high-pressure jet and finally ejected from the nozzle.

[0014] In some embodiments of the present invention, the injection pipe includes a rotating tube and a nozzle, and a slurry channel and an air channel are provided in the rotating tube. One end of the slurry channel is connected to the high-pressure grouting barrel, and the other end of the slurry channel is connected to the nozzle. One end of the air channel is connected to the air compressor, and the other end of the air channel is connected to the nozzle.

[0015] In some embodiments of the present invention, the nozzle is fixedly connected to the rotating tube; in step S302, causing the spraying tube to rotate around its own axis specifically includes: causing the rotating tube to rotate around its own axis to drive the nozzle to rotate along the circumferential direction of the rotating tube and continuously spray high-pressure jets.

[0016] In some embodiments of the present invention, in step S400, sealing the opening of the slot hole specifically includes: pouring the mixed cement mortar into the opening of the slot hole so that the cement mortar fits tightly against the inner wall of the slot hole and the surrounding soil.

[0017] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference numerals are used throughout the accompanying drawings to denote the same components. In the accompanying drawings:

[0019] Figure 1 A flow chart of a soil high-pressure grouting reinforcement method provided by an embodiment of the present invention;

[0020] Figure 2 A detailed flow chart of step S100 in the soil high-pressure grouting reinforcement method provided in an embodiment of the present invention;

[0021] Figure 3 A detailed flow chart of step S200 in the soil high-pressure grouting reinforcement method provided in an embodiment of the present invention;

[0022] Figure 4 This is a detailed flow chart of step S300 in the soil high-pressure grouting reinforcement method provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0023] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0024] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0025] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0026] For ease of description, spatially relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figures, such as "inside," "outside," "inside," "outside," "below," "beneath," "above," and the like. Such spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is flipped, an element described as "below" or "below" another element or feature would then be oriented as "above" or "above" another element or feature. Thus, the example term "below" can include both above and below orientations. The device may be otherwise oriented (rotated 90 degrees or in other orientations) and the spatially relative descriptors used herein are interpreted accordingly.

[0027] Figure 1 The flowchart of the soil high pressure grouting reinforcement method provided by the embodiment of the present invention is as follows: Figure 1 As shown, an embodiment of the present invention provides a soil high-pressure grouting reinforcement method, comprising:

[0028] Step S100: drilling holes in the ground at the construction site to generate slots;

[0029] Step S200: inserting the sleeve valve tube into the slot hole, ensuring that the grouting core tube can pass through the cavity of the sleeve valve tube, and performing segmented directional grouting reinforcement in the slot hole through the grouting core tube and the sleeve valve tube;

[0030] Step S300: Pull out the grouting core tube from the cavity, extend the jet tube into the cavity until the nozzle of the jet tube is at the bottom of the slot hole, and perform high-pressure rotary jet grouting reinforcement in the slot hole through the jet tube, so that the high-pressure jet breaks through the sleeve valve tube;

[0031] Step S400: Pull the injection tube out of the slot hole to seal the opening of the slot hole.

[0032] In this embodiment, during operation, this high-pressure grouting reinforcement method for soil is firstly performed by generating a slot hole, and then performing segmented directional grouting in the slot hole to perform a preliminary reinforcement of the stratum soil at the construction site. Since the slurry sprayed during the segmented directional grouting process has a relatively small pressure, the disturbance to the stratum surrounding the construction site is reduced to a certain extent. When the segmented directional grouting reinforcement is completed, the grouting core tube is pulled out of the cavity of the sleeve valve tube, and the injection tube is then inserted into the cavity of the sleeve valve tube, and then high-pressure rotary grouting is performed to further reinforce the stratum soil at the construction site.

[0033] Therefore, this soil high-pressure grouting reinforcement method can perform high-pressure grouting reinforcement on the stratum soil at the construction site while ensuring the safety of the environment around the construction site.

[0034] It is easy to understand that before step S100, a drilling location needs to be selected, and the slot position can be determined and marked using a measuring instrument, for example, by driving a wooden stake into the selected hole position and tying a red rope as a mark.

[0035] Figure 2 The detailed flow chart of step S100 in the soil high pressure grouting reinforcement method provided by the embodiment of the present invention is as follows: Figure 2 As shown, according to an optional embodiment of the present invention, step S100 specifically includes:

[0036] Step S101: generating a slotted hole by following the drilling with a steel casing;

[0037] Step S102: injecting casing material into the slot;

[0038] Step S103: Pull the steel casing out of the slot to form an accommodating space in the slot. The accommodating space is the space in the slot where the steel casing was originally located.

[0039] In this embodiment, in step S101, due to the high strength and rigidity of the steel casing, it can promptly support the inner wall of the slot during the drilling process, effectively preventing slot collapse. This is particularly true in unfavorable geological conditions such as loose, broken, or soft soil layers, thereby ensuring the stability of the drill hole and creating favorable conditions for subsequent grouting. The steel casing method of following the drilling process can also better control the direction and trajectory of the drill hole. Through auxiliary equipment such as guide devices, precise directional drilling can be achieved, meeting the high-precision requirements of segmented directional grouting for drill hole position and angle, allowing the slurry to be accurately injected into the predetermined formation location. Furthermore, for formations with complex geological conditions such as boulders and gravel, the steel casing can, to a certain extent, provide a crushing and compacting effect, facilitating smooth drilling and reducing accidents such as drill sticking and drill burial.

[0040] In step S102, the casing material can separate the sleeve valve tube that will subsequently be inserted into the slot from the surrounding strata, preventing the slurry from directly contacting the slot during the grouting process and causing large-scale leakage. It also protects the grouting hole of the sleeve valve tube from erosion and damage by the surrounding medium on the inner wall of the slot, thereby ensuring the normal operation of the sleeve valve tube. Furthermore, because the casing material has a certain strength and toughness, it can constrain the slurry to diffuse within a specific range as designed. During the grouting process, the casing material can be partially ruptured under pressure to form specific grouting channels, allowing the slurry to enter the cracks or pores of the formation in a targeted manner, thereby achieving directional grouting and preventing disordered slurry flow within the hole. By controlling parameters such as the thickness and strength of the casing material, the slurry can accurately form the desired slurry shape and distribution in the target formation during segmented directional grouting, thereby improving grouting efficiency. In addition, since the casing material is filled in the slot, it can preliminarily fill and seal the tiny cracks and pores in the stratum to improve the sealing of the stratum, reduce the loss of slurry before grouting, and help to establish effective grouting pressure during grouting, so that the slurry can better enter the deep stratum, thereby further improving the soil reinforcement effect.

[0041] As for step S103, it is easy to understand that the purpose of pulling the steel sleeve out of the slot is to provide space for subsequently inserting the sleeve valve tube into the slot.

[0042] According to an optional embodiment of the present invention, in step S200, extending the sleeve valve tube into the slot hole specifically includes: extending the sleeve valve tube into the accommodating space.

[0043] In this embodiment, combined with the above-mentioned step S103, it is easy to understand that under the premise of adopting the steel casing follow-up drilling method, it will not affect the subsequent sleeve valve tube extending into the slot hole.

[0044] Figure 3 The detailed flow chart of step S200 in the soil high pressure grouting reinforcement method provided by the embodiment of the present invention is as follows: Figure 3 As shown, according to an optional embodiment of the present invention, step S200 specifically includes:

[0045] Step S201: preparing a sleeve valve pipe, directional grouting equipment, and a grouting core pipe, and providing a plurality of grouting holes at intervals along the extending direction of the sleeve valve pipe;

[0046] Step S202: Connect one end of the grouting core tube to the directional grouting equipment, extend the sleeve valve tube into the slot, and ensure that the end of the grouting core tube facing away from the directional grouting equipment can pass through the cavity of the sleeve valve tube;

[0047] Step S203: Start the directional grouting equipment, align the slurry outlet holes of the grouting core tube with the different grouting holes on the sleeve valve tube in sequence, so that the slurry can be sprayed out from the corresponding grouting holes, thereby realizing segmented directional grouting reinforcement in the slot hole.

[0048] In this embodiment, for step S201, it is easy to understand that the purpose of setting multiple grouting holes along the sleeve valve tube's own extension direction is to achieve subsequent segmented grouting in the slot hole (i.e., directional grouting at different depths in the slot hole).

[0049] In step S202, one end of the grouting core pipe is connected to the directional grouting equipment, so that the directional grouting equipment can transport slurry into the grouting core pipe.

[0050] Regarding step S203, it should be noted that when grouting in sections, you can choose to grout from top to bottom (i.e., from the hole mouth to the bottom of the hole) so that the slurry holes are aligned with the grouting holes at different depths in sequence, or from bottom to top (i.e., from the bottom of the hole to the hole mouth) so that the slurry holes are aligned with the grouting holes at different depths in sequence. These two methods can be selected according to the actual working conditions and are not limited.

[0051] According to an optional embodiment of the present invention, the directional grouting equipment includes a directional grouting bucket and a directional grouting pump; in step S203, starting the directional grouting equipment specifically includes: turning on the directional grouting pump to enable the directional grouting pump to supply the slurry in the directional grouting bucket to the grouting core pipe.

[0052] In this embodiment, specifically, a directional grouting pump can be provided to enable the directional grouting equipment to transport slurry into the grouting core pipe.

[0053] It is easy to understand that the directional grouting pump can be a hydraulic pump. The method of transporting slurry into the grouting core pipe through the hydraulic pump is simple, convenient and reliable to operate, which effectively ensures the working efficiency of the segmented directional grouting reinforcement.

[0054] Figure 4 The detailed flow chart of step S300 in the soil high pressure grouting reinforcement method provided by the embodiment of the present invention is as follows: Figure 4 As shown, according to an optional embodiment of the present invention, step S300 specifically includes:

[0055] Step S301: Prepare a spray pipe and a high-pressure grouting device, connect one end of the spray pipe to the high-pressure grouting device, and provide a nozzle at the end of the spray pipe facing away from the high-pressure grouting device;

[0056] Step S302: Extend the nozzle to the bottom of the slot, start the high-pressure grouting equipment, and make the jet pipe rotate around its own axis and gradually rise from the bottom of the slot to achieve high-pressure rotary grouting reinforcement in the slot, so that the sleeve valve tube is broken by the high-pressure jet.

[0057] Specifically, the operation process of each step in step S300 is described in detail below:

[0058] For step S301, the high-pressure grouting equipment includes a high-pressure grouting barrel, a high-pressure grouting pump and an air compressor; the injection pipe includes a rotating tube and a nozzle, the nozzle is fixedly connected to the rotating tube, a slurry channel and an air channel are provided in the rotating tube, one end of the slurry channel is connected to the high-pressure grouting barrel, the other end of the slurry channel is connected to the nozzle, one end of the air channel is connected to the air compressor, and the other end of the air channel is connected to the nozzle.

[0059] For step S302, after the nozzle is inserted into the bottom of the slot, the high-pressure grouting pump and the air compressor are turned on. The high-pressure grouting pump pressurizes the slurry in the high-pressure grouting barrel and supplies it to the injection pipe, which eventually flows to the nozzle. The air compressor supplies high-pressure air to the injection pipe, which eventually flows to the nozzle. The high-pressure air and the pressurized slurry are mixed in the injection pipe to form a high-pressure jet, which is eventually ejected from the nozzle. At the same time, the rotating tube is rotated around its own axis to drive the nozzle to rotate along the circumferential direction of the rotating tube and continuously eject the high-pressure jet, so as to realize high-pressure rotary jet grouting reinforcement in the slot.

[0060] It is easy to understand that, since the slurry sprayed in this step has a high pressure, the sleeve valve tube can be broken by the high-pressure jet, thereby realizing high-pressure rotary grouting reinforcement in the slot hole.

[0061] According to an optional embodiment of the present invention, in step S400, sealing the opening of the slot hole specifically includes: pouring the mixed cement mortar into the opening of the slot hole so that the cement mortar fits tightly against the inner wall of the slot hole and the surrounding soil.

[0062] In this embodiment, specifically, before sealing the hole, the debris and residual slurry around the hole can be cleaned up first, and the surface of the hole can be scraped flat; in addition, the cement mortar can be stirred by a mixer. After the stirred cement mortar is poured into the slot from the hole, the cement mortar can be vibrated and compacted by structures such as a vibrating rod to ensure that the cement mortar can fit tightly with the inner wall of the slot and the surrounding soil, thereby ensuring the sealing efficiency.

[0063] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A soil high-pressure grouting reinforcement method, characterized in that: include: Step S100: drilling holes in the ground at the construction site to generate slots; Step S200: inserting the sleeve valve tube into the slot hole, ensuring that the grouting core tube can pass through the cavity of the sleeve valve tube, and performing segmented directional grouting reinforcement in the slot hole through the grouting core tube and the sleeve valve tube; Step S300: pulling the grouting core tube out of the cavity, extending the injection tube into the cavity until the nozzle of the injection tube is at the bottom of the slot hole, and performing high-pressure rotary jet grouting reinforcement in the slot hole through the injection tube, so that the high-pressure jet breaks through the sleeve valve tube; Step S400: pulling the injection pipe out of the slot hole to seal the opening of the slot hole.

2. The soil high-pressure grouting reinforcement method according to claim 1, characterized in that: The step S100 specifically includes: Step S101: generating the slotted hole by using a steel casing followed by drilling; Step S102: injecting casing material into the slot; Step S103: Pull the steel casing out of the slot to form a receiving space in the slot, where the receiving space is the space in the slot where the steel casing was originally located.

3. The soil high-pressure grouting reinforcement method according to claim 2, characterized in that: In the step S200, inserting the sleeve valve tube into the slot specifically includes: inserting the sleeve valve tube into the accommodating space.

4. The soil high-pressure grouting reinforcement method according to claim 1, characterized in that: The step S200 specifically includes: Step S201: preparing a sleeve valve pipe, directional grouting equipment, and a grouting core pipe, and providing a plurality of grouting holes at intervals along the extending direction of the sleeve valve pipe; Step S202: connecting one end of the grouting core tube to the directional grouting equipment, extending the sleeve valve tube into the slot, and ensuring that the end of the grouting core tube facing away from the directional grouting equipment can pass through the cavity of the sleeve valve tube; Step S203: Start the directional grouting equipment, align the slurry outlet holes of the grouting core pipe with different grouting holes on the sleeve valve pipe in sequence, so that the slurry can be sprayed out from the corresponding grouting holes, thereby realizing segmented directional grouting reinforcement in the slot hole.

5. The soil high-pressure grouting reinforcement method according to claim 4, characterized in that: The directional grouting equipment includes a directional grouting bucket and a directional grouting pump; In the step S203, starting the directional grouting equipment specifically includes: starting the directional grouting pump to enable the directional grouting pump to supply the slurry in the directional grouting bucket to the grouting core pipe.

6. The soil high-pressure grouting reinforcement method according to claim 1, characterized in that: The step S300 specifically includes: Step S301: preparing a spray pipe and a high-pressure grouting device, connecting one end of the spray pipe to the high-pressure grouting device, and providing a nozzle at the end of the spray pipe facing away from the high-pressure grouting device; Step S302: Extend the nozzle to the bottom of the slot hole, start the high-pressure grouting equipment, and make the injection pipe rotate around its own axis and gradually rise from the bottom of the slot hole to realize high-pressure rotary grouting reinforcement in the slot hole, so that the sleeve valve tube is broken by the high-pressure jet.

7. The soil high-pressure grouting reinforcement method according to claim 6, characterized in that: The high-pressure grouting equipment includes a high-pressure grouting bucket, a high-pressure grouting pump and an air compressor; In step S302, starting the high-pressure grouting equipment specifically includes: turning on the high-pressure grouting pump and the air compressor, the high-pressure grouting pump pressurizes the slurry in the high-pressure grouting barrel and supplies it to the injection pipe and finally flows to the nozzle, the air compressor supplies high-pressure air to the injection pipe and finally flows to the nozzle, the high-pressure air and the pressurized slurry are mixed in the injection pipe to form a high-pressure jet and finally ejected from the nozzle.

8. The soil high-pressure grouting reinforcement method according to claim 7, characterized in that: The injection pipe includes a rotating tube and the nozzle. A slurry channel and an air channel are provided in the rotating tube. One end of the slurry channel is connected to the high-pressure grouting barrel, and the other end of the slurry channel is connected to the nozzle. One end of the air channel is connected to the air compressor, and the other end of the air channel is connected to the nozzle.

9. The soil high-pressure grouting reinforcement method according to claim 8, characterized in that: The nozzle is fixedly connected to the rotating tube; In the step S302, causing the spray pipe to rotate about its own axis specifically includes causing the rotating pipe to rotate about its own axis to drive the spray head to rotate along the circumferential direction of the rotating pipe and continuously spray high-pressure jets.

10. The soil high-pressure grouting reinforcement method according to any one of claims 1 to 9, characterized in that: In the step S400, the sealing of the opening of the slot hole specifically includes: pouring the mixed cement mortar into the opening of the slot hole, so that the cement mortar fits tightly with the inner wall of the slot hole and the surrounding soil.

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