Sleeve valve pipe grouting construction method based on inorganic cementing material

Abstract

The invention relates to the technical field of sleeve valve pipe grouting, and discloses a sleeve valve pipe grouting construction method based on an inorganic cementing material, which comprises the following construction steps: 1) forming a grouting hole; (2) flow-state solidified soil is injected into the grouting holes, the flow-state solidified soil is formed by stirring and mixing slurry, a water body and an inorganic cementing material, and the inorganic cementing material is formed by stirring and mixing slag powder, steel slag powder, fly ash, desulfurized fly ash, ardealite, fly ash, red mud and stone powder; (3) a sleeve valve pipe is put down, and the flow-state solidified soil forms a sleeve shell layer wrapping the periphery of the sleeve valve pipe; the sleeve valve pipe is provided with a grouting section and a closed section, and the sleeve shell layer is provided with an upper layer and a lower layer; 4) injecting slurry through the sleeve valve pipe, wherein the slurry is formed by stirring and mixing an inorganic cementing material and a water body; the slurry transversely permeates into gaps in the soft soil stratum, and the slurry is combined with the soft soil stratum to form an integrated consolidation body; and (5) after grouting of the sleeve valve pipe is completed, the grout hole is sealed.

Description

Technical Field

[0001] This invention patent relates to the technical field of sleeve valve pipe grouting, and specifically, to a construction method of sleeve valve pipe grouting based on inorganic cementitious materials. Background Art

[0002] Coastal and tidal flat areas are rich in soft soil layers such as silt. Soft soil layers have poor properties, low strength, and high water content. When carrying out deep foundation pit excavation and construction in soft soil layers, leakage phenomena such as quicksand and piping are likely to occur due to the characteristics of soft soil layers.

[0003] Under the condition of not affecting normal construction, it often happens that the soft soil layer is not treated in advance due to reasons such as cost. During the foundation pit excavation process, leakage is very likely to occur. The surrounding soft soil such as silt enters the foundation pit along with the leakage water flow, forming underground cavities in the outer area of the foundation pit, which in turn causes large-scale ground settlement.

[0004] Currently, sleeve valve pipe grouting and plugging reinforcement are often carried out behind the retaining piles. The sleeve valve pipe is used as the PVC grouting outer pipe, which is divided into pipe A and pipe B. Pipe A has no overflow holes drilled and is in the non-grouting hole section during pipe lowering. Pipe B has overflow holes drilled, and the overflow holes are wrapped with rubber rings. When the pipe is lowered to the grouting section, pipe A and pipe B are connected by screw threads to form a complete sleeve valve pipe.

[0005] During the grouting construction process of the sleeve valve pipe, a grouting steel pipe with sealed rubber cup at both ends is inserted into the sleeve valve pipe. Under the action of pressure, the grout expands the rubber ring through the overflow holes and enters the formation. The grouting steel pipe is lifted or lowered for sectional grouting. When the grouting stops, the rubber ring closes to prevent water and particles in the formation from entering the sleeve valve pipe reversely. The construction process of sleeve valve pipe grouting is: drilling → replacing the mud in the hole with casing material → inserting the sleeve valve pipe → inserting the grouting steel pipe → grouting → sealing the hole.

[0006] When carrying out sleeve valve pipe grouting construction, first, the grouting holes required for the project need to be drilled according to the design situation, and then the sleeve valve pipe is placed into the grouting holes. After the casing material is cured, the grouting steel pipe is moved along the sleeve valve pipe to the required grouting position. Subsequently, through the grouting pump, the grout with a certain proportion is transmitted to the sleeve valve pipe through the grouting steel pipe. The grouting pressure expands the rubber ring outside the sleeve valve pipe, and the casing material is crushed. At this time, the grout gradually penetrates into the pores and cracks of the soft soil layer. Under the action of the grouting pressure, the soft soil layer produces a splitting phenomenon at the weak structural plane. The grout will flow continuously along the cracks and fill the cracks. The solidified grout forms a splitting grout vein with the soft soil layer, which has an obvious compaction effect on the soil and improves its bearing capacity.

[0007] In the prior art, the casing material is made by mixing cement, bentonite and water. The casing material mixed with cement and bentonite has a long setting time. Generally, it needs to be cured for 5d to 7d to reach the grouting strength, resulting in a long construction period. Moreover, cement has shrinkage, which will form gaps between the casing material and the inner wall of the grouting hole. During the grouting process, situations such as pollution of the grouting hole and grouting failure are likely to occur, and the expected effect cannot be achieved. In addition, the prices of cement and bentonite are relatively high and uneconomical.

[0008] The commonly used slurries for sleeve valve pipe grouting are pure cement slurry or cement-sodium silicate double-fluid slurry. The curing mechanism of cement as a soil solidifying agent is related to the hydrolysis and hydration reactions of cement itself and carbonation, and is also affected by the interaction between clay particles and cement hydrates. The hardening process of cement soil is usually relatively slow, and the curing effect is limited. At the same time, the construction period of the sleeve valve pipe is relatively long. After each section of grouting is completed and fully cured, the next section of grouting can be carried out, which prolongs the overall period.

[0009] In addition, the main raw materials of cement include limestone, clay, iron ore, coal, etc. After being crushed and screened, they are mixed in a certain proportion and ground into raw materials by a mill and sent into a cement rotary kiln for calcination at a high temperature (usually about 1450°C). The calcined clinker is ground together with auxiliary materials such as gypsum by a cement mill to finally produce fine powder cement. The production cost of cement is relatively high, the price is relatively expensive, and a large amount of greenhouse gases such as CO2 are emitted during the production process. It has the characteristics of high energy consumption, high emissions, and high pollution, and the environmental protection performance is poor. Summary of the Invention

[0010] The purpose of the present invention is to provide a sleeve valve pipe grouting construction method based on inorganic cementitious materials, aiming to solve the problem of long construction period in the prior art when using cement for construction.

[0011] The present invention is realized as follows. The sleeve valve pipe grouting construction method based on inorganic cementitious materials includes the following construction steps:

[0012] 1) Drill a hole in the soft soil layer of the construction site to form a grouting hole;

[0013] 2) Inject fluidized solidified soil into the grouting hole, and the fluidized solidified soil fills the grouting hole; the fluidized solidified soil is formed by stirring and mixing mud, water and inorganic cementitious materials. The mud is formed by stirring and mixing muck and water. The inorganic cementitious materials are in powder form and are formed by stirring and mixing slag powder, steel slag powder, fly ash, desulfurized ash, phosphogypsum, fly ash, red mud and stone powder;

[0014] 3), Lower a sleeve valve pipe into the grouting hole, and the flowing state solidified soil forms a casing layer wrapped around the outer periphery of the sleeve valve pipe; the lower part of the sleeve valve pipe has a grouting section, and the upper part of the sleeve valve pipe has a closed section. The casing layer has an upper layer wrapped around the outer periphery of the closed section and a lower layer wrapped around the outer periphery of the grouting section;

[0015] 4), Inject slurry through the sleeve valve pipe. The slurry is formed by stirring and mixing inorganic cementitious materials and water; the slurry breaks through the lower layer and laterally penetrates into the voids and cracks in the soft soil layer. The slurry combines with the soft soil layer to form an integral consolidation body, and the upper layer restricts the slurry from deviating from the grouting section and seeping upward;

[0016] 5), After the grouting of the sleeve valve pipe is completed, seal the grouting hole.

[0017] Further, in the construction step 2), the slurry is formed by stirring and mixing waste soil and water after soaking.

[0018] Further, in the construction step 2), the waste soil is first crushed by a crusher, then screened and filtered through a sieve, soaked in water for a set time, and then stirred and mixed with water to form the slurry.

[0019] Further, in the construction step 2), after the waste soil is screened and filtered through a sieve, it is placed in a slurry tank for standby. Water is added to the slurry tank, and the water and the waste soil are soaked and stirred until a slurry with a set fluidity is formed;

[0020] Mix the inorganic cementitious materials and water in a mixer to form a slurry. According to a set ratio, extract the slurry from the slurry tank to the mixer, and the slurry and the slurry are stirred and mixed to form the flowing state solidified soil.

[0021] Further, the stirring and mixing time of the slurry and the slurry in the mixer is not less than 2 minutes.

[0022] Further, in the construction step 2), within a set time after the grouting hole is formed in the soft soil layer, inject the flowing state solidified soil from the bottom of the grouting hole. The accumulated water and sediment in the grouting hole are squeezed by the flowing state solidified soil and discharged from the top of the grouting hole until the flowing state solidified soil completely replaces the accumulated water and sediment in the grouting hole, and the flowing state solidified soil fills the grouting hole.

[0023] Further, in the construction step 2), extend the drill pipe of the geological drill to the bottom of the grouting hole, and under the action of the grouting pressure, inject the flowing state solidified soil into the bottom of the grouting hole until the flowing state solidified soil completely replaces the accumulated water and sediment in the grouting hole.

[0024] Further, in the construction step 4), the initial setting time of the fluidized solidified soil is 5 to 12 hours, and the 28-day compressive strength is between 0.3 and 2.0 MPa. After 24 hours when the fluidized solidified soil forms a casing layer, the first round of grout injection is carried out through the sleeve valve pipe, and the grouting pressure is controlled between 1.2 MPa and 3.0 MPa.

[0025] Further, in the construction step 2), a rotating disk that rotates horizontally is provided at the bottom of the slurry tank. A plurality of rolling shafts that roll horizontally are provided on the rotating disk, and the plurality of rolling shafts are arranged at intervals along the circumferential direction of the rotating disk; when the slurry is placed in the slurry tank, the rotating disk rotates horizontally, and the plurality of rolling shafts roll horizontally synchronously with the rotation of the rotating disk, and the rotating disk and the rolling shafts agitate the slurry to keep the slurry in a stirred state.

[0026] Further, in the construction step 2), during the process of injecting grout through the sleeve valve pipe, the grouting pressure is intermittently applied to the grout to form an intermittent impact on the grout, so that the grout breaks through the lower layer;

[0027] After the grout breaks through the lower layer, the grouting pressure of the grout is gradually increased until the grout reaches the penetration range.

[0028] Compared with the prior art, the sleeve valve pipe grouting construction method based on inorganic cementitious materials provided by the present invention has the following technical advantages:

[0029] 1), Using the grout formed by mixing inorganic cementitious materials and water body to replace the traditional cement material for sleeve valve pipe grouting, reducing production costs, shortening the construction period, and being able to digest mine and industrial solid wastes to realize the resource utilization of solid wastes; the inorganic cementitious materials are smaller than cement particles and are filled more densely. After split grouting, they enter the soft soil layer and carry out a series of physical and chemical reactions with the soft soil layer. In addition to the hydration reaction, they also react chemically with the clay minerals in the soft soil layer, and the formed consolidated body has higher strength and better impermeability;

[0030] 2), The inorganic cementitious materials, slurry and water body are stirred and mixed to form fluidized solidified soil, which is used as the casing material to replace the casing material formed by traditional cement and bentonite. It has micro-expansion properties, avoids the formation of cracks due to material shrinkage between the inner wall of the grouting hole, has a shorter curing time, shortens the construction period, and speeds up the construction progress; at the same strength level, the dosage of inorganic cementitious materials is lower; the materials are locally sourced to realize the resource utilization of on-site muck; the price is low, saving transportation costs, and greatly reducing material costs and production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a flow chart of the sleeve valve pipe grouting construction method based on inorganic cementitious materials provided by the present invention;

[0032] Figure 2 It is the front view schematic diagram of the arrangement of the rotating disk and the rolling shaft provided by the present invention. Specific embodiments

[0033] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0034] The implementation of the present invention will be described in detail below in conjunction with specific embodiments.

[0035] In the drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings. It 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. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and cannot be understood as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0036] Referring to Figure 1-2 as shown, it is a preferred embodiment provided by the present invention.

[0037] The sleeve valve pipe grouting construction method based on inorganic cementitious materials includes the following construction steps:

[0038] 1), Drilling holes in the soft soil layer of the construction site to form grouting holes;

[0039] 2), Injecting fluidized solidified soil into the grouting holes, and the fluidized solidified soil fills the grouting holes; the fluidized solidified soil is formed by stirring and mixing mud, water body and inorganic cementitious materials. The mud is formed by stirring and mixing muck and water body. The inorganic cementitious materials are in powder form and are formed by stirring and mixing slag powder, steel slag powder, fly ash, desulfurized ash, phosphogypsum, fly ash, red mud and stone powder;

[0040] 3), Lowering a sleeve valve pipe into the grouting hole, and the fluidized solidified soil forms a sheathing layer wrapped around the outer periphery of the sleeve valve pipe; the lower part of the sleeve valve pipe has a grouting section, the upper part of the sleeve valve pipe has a closed section, and the sheathing layer has an upper layer wrapped around the outer periphery of the closed section and a lower layer wrapped around the outer periphery of the grouting section;

[0041] 4) Inject grout through the sleeve valve pipe. The grout is formed by mixing inorganic cementitious materials and water. The grout breaks through the lower layer and laterally penetrates into the voids and cracks in the soft soil layer. The grout combines with the soft soil layer to form an integral consolidated body, and the upper layer restricts the upward penetration of the grout deviating from the grouting section.

[0042] 5) After the sleeve valve pipe grouting is completed, seal the grouting hole.

[0043] The sleeve valve pipe grouting construction method based on inorganic cementitious materials provided above has the following technical advantages:

[0044] 1) Use the grout formed by mixing inorganic cementitious materials and water to replace the traditional cement materials for sleeve valve pipe grouting, reduce production costs, shorten the construction period, and can digest mine and industrial solid wastes to achieve the resource utilization of solid wastes. The inorganic cementitious materials are smaller than cement particles and are filled more densely. After splitting grouting, they enter the soft soil layer and undergo a series of physical and chemical reactions with the soft soil layer. In addition to the hydration reaction, they also react chemically with the clay minerals in the soft soil layer, and the formed consolidated body has higher strength and better impermeability.

[0045] 2) The inorganic cementitious materials, mud, and water are stirred and mixed to form a fluidized solidified soil as the casing material, replacing the casing material formed by traditional cement and bentonite. It has micro-expansibility, avoids the formation of cracks due to material shrinkage between the inner wall of the grouting hole, has a shorter curing time, shortens the construction period, and speeds up the construction progress. At the same strength level, the dosage of inorganic cementitious materials is lower. The materials are locally sourced to achieve the resource utilization of on-site construction waste. The price is low, saving transportation costs, and greatly reducing material costs and production costs.

[0046] The inorganic cementitious materials are mainly composed of mine and industrial solid waste materials, such as slag powder, steel slag powder, fly ash, desulfurized ash, phosphogypsum, fly ash, red mud, and stone powder, which are stirred and mixed, and then ground and mixed after adding activators. There is no need for calcination, the production process has low energy consumption, little pollution, low emissions, good environmental protection, and the production cost is 30% lower than that of cement.

[0047] At present, different formulas can be prepared according to various soils, such as weathered rock soil, silt, cohesive soil, sandy soil, loess, red soil, construction waste tail mud, etc., and it can be applied to most soils. The inorganic cementitious materials are smaller than cement particles and are filled more densely. After splitting grouting into the soft soil layer, they undergo a series of physical and chemical reactions with the soft soil layer. In addition to the hydration reaction, the inorganic cementitious materials also react chemically with the clay minerals in the soft soil layer, and the formed consolidated body has higher strength and better impermeability. Replacing traditional cement materials with inorganic cementitious materials can reduce costs and achieve the resource utilization of mine and industrial solid wastes.

[0048] Flowable solidified soil has the characteristics of high fluidity, self-compaction, controllable strength, good stability, environmental protection and energy saving, convenient construction, and easy access to materials. Its fluidity is generally 160 - 220 mm, and its 28-day compressive strength is between 0.3 - 2.0 MPa. Flowable solidified soil can utilize local solid waste materials such as construction waste, realizing the resource utilization of waste and reducing costs.

[0049] The good fluidity of flowable solidified soil enables it to be pumped to the designated location by a concrete pump, with convenient construction. No dust will be generated during the construction process, which is friendly to the surrounding environment. By adjusting factors such as the dosage of inorganic cementitious materials and the water-cement ratio, the strength of flowable solidified soil can be precisely controlled as required. The composite material formed after curing has high compressive strength and stability, effectively preventing the settlement and deformation of soft soil strata, and has good water stability and low permeability, which can prevent the penetration and erosion of water.

[0050] Using flowable solidified soil as the casing material of the sleeve valve pipe has micro-expansibility, avoiding the formation of cracks due to material shrinkage between the inner wall of the grouting hole, with a shorter curing time, which can shorten the construction period and accelerate the construction progress; at the same strength level, the dosage of inorganic cementitious materials is lower; the materials are locally sourced, realizing the resource utilization of on-site construction waste; the price is low, saving transportation costs, and greatly reducing material costs and production costs.

[0051] The core material of flowable solidified soil is inorganic cementitious material. According to the characteristics of rock and soil and the requirements of engineering performance, combined with local materials, it adopts the technical route of "composite mineral design + chemical activation + surface modification of soil particles" to form a targeted special cementitious material, solving the problems of poor hydration conditions, difficult continuous distribution of hydration products, and insufficient durability of traditional cementitious materials in the soil particle environment. Through the regulation mechanism, the hydration products of inorganic cementitious materials are distributed orderly in time and space, forming the densest consolidation body in the micro-structure.

[0052] Through a series of physical and chemical reactions such as ion exchange, flocculation, hydration, and carbonation between the inorganic cementitious material and the soft soil stratum, it produces substances such as cemented soil particles and crystal minerals to fill the cracks, improving the physical and mechanical properties of the soft soil stratum and forming flowable solidified soil that meets the engineering requirements.

[0053] The process of strength growth of flowable solidified soil is actually the process of chemical reactions between the active silicon, aluminum, calcium and other effective mineral components in the inorganic cementitious material and water and clay minerals. Some studies show that the strength of flowable solidified soil increases with the increase of curing age, and its growth is not limited to the 28-day or 90-day curing period. With the increase of the mixing ratio and curing age, the unconfined compressive strength of flowable solidified soil shows a gradually increasing trend. The constitutive relationship of the stress-strain curve of premixed flowable solidified soil has similar characteristics to that of the stress-strain curve of concrete.

[0054] In this embodiment, in construction step 2), the mud is formed by soaking the waste soil in water and then stirring and mixing it. This makes it easy to use local materials and reuse the waste soil.

[0055] In this embodiment, in construction step 2), the waste soil is first crushed by a crusher, then screened and filtered through a sieve, soaked in water for a set time, and then stirred and mixed with the water to form mud.

[0056] In this embodiment, in construction step 2), the waste soil is filtered through a sieve and placed in a mud box for standby use. Water is added to the mud box, and the water and the waste soil are immersed and stirred until a mud with a set fluidity is formed;

[0057] The inorganic gelling material and water are stirred and mixed in a mixer to form a slurry. According to the set ratio, mud is pumped from the mud box into the mixer, and the mud and slurry are stirred and mixed to form fluidized solidified soil.

[0058] The preparation of fluidized solidified soil follows the principles of adapting to local conditions, adapting to soil conditions and adapting to usage. Based on the existing local convenient conditions, comprehensive consideration is given to the use of local industrial waste, slag and regional materials, and the soil characteristics of the local fluidized solidified soil are analyzed. Then, based on the engineering application of fluidized solidified soil, appropriate curing agent components and ratios are designed to achieve the purpose of reducing transportation links, reducing urban pollution and ensuring the quality of engineering construction.

[0059] In this embodiment, the mud and slurry are stirred and mixed in the mixer for no less than 2 minutes, and finally various indicators of the fluidized solidified soil are tested. After passing the test, the soil is stored as a casing material for future use.

[0060] In this embodiment, in construction step 2), within a set time after the grouting hole is formed in the soft soil layer, fluidized solidified soil is injected from the bottom of the grouting hole, and the accumulated water and sediment in the grouting hole are squeezed by the fluidized solidified soil and discharged from the top of the grouting hole until the fluidized solidified soil replaces all the accumulated water and sediment in the grouting hole and the fluidized solidified soil fills the grouting hole.

[0061] In construction step 2), the drill rod of the geological drill is extended to the bottom of the grouting hole, and under the action of grouting pressure, fluidized solidified soil is injected into the bottom of the grouting hole until the fluidized solidified soil replaces all the accumulated water and sediment in the grouting hole.

[0062] The fluidized solidified soil is injected from the bottom of the grouting hole, squeezing the accumulated water sediment in the grouting hole from bottom to top, and overflowing from the top of the grouting hole to achieve the replacement of the accumulated water sediment by the fluidized solidified soil, and complete replacement can be achieved.

[0063] In this embodiment, in construction step 4), the initial setting time of the fluidized solidified soil is 5 to 12 hours, and the 28-day compressive strength is between 0.3 and 2.0 MPa. After 24 hours when the fluidized solidified soil forms a casing layer, the first round of slurry injection is carried out through the sleeve valve pipe, and the grouting pressure is controlled between 1.2 MPa and 3.0 MPa.

[0064] In construction step 5), after the compaction grouting is completed, the grouting hole is closed and protected with a blanking cap for repeated use.

[0065] In this embodiment, in construction step 2), a horizontally rotating rotating disk 100 is provided at the bottom of the mud tank. A plurality of horizontally rolling rolling shafts 200 are provided on the rotating disk 100, and the plurality of rolling shafts 200 are arranged at intervals along the circumferential direction of the rotating disk 100; when the mud is placed in the mud tank, the rotating disk 100 rotates horizontally, and the plurality of rolling shafts 200 roll horizontally synchronously with the rotation of the rotating disk 100. The rotating disk 100 and the rolling shafts 200 stir the mud to keep the mud in a stirred state. In this way, the mud placed in the mud tank will not show segregation, so that the mud pumped into the mixer meets the requirements.

[0066] During the horizontal rotation of the rotating disk 100, the mud is subjected to an impact force, which reversely drives the rolling shafts 200 to roll horizontally synchronously. Thus, the rotating disk 100 and the rolling shafts 200 rotate synchronously, realizing multi-directional stirring of the mud in the mud tank, and stirring from the bottom of the mud tank, better avoiding the segregation of the mud.

[0067] In this embodiment, in construction step 2), during the process of injecting slurry through the sleeve valve pipe, the grouting pressure is intermittently applied to the slurry to form an intermittent impact on the slurry, so that the slurry breaks through the lower layer; when the slurry breaks through the lower layer, the grouting pressure of the slurry is gradually increased until the slurry reaches the penetration range.

[0068] First of all, by applying the grouting pressure to the slurry in an impact manner, better impact of the slurry on the lower layer can be achieved, so that the slurry breaks through the lower layer. When the slurry breaks through the lower layer, the slurry penetrates into the voids and cracks in the soft soil layer and forms an integral consolidation body with the soft soil layer. During the penetration process of the slurry, a wider penetration range can be achieved through the continuously increasing grouting pressure.

[0069] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. The sleeve valve pipe grouting construction method based on inorganic cementitious materials is characterized in that It includes the following construction steps: 1) Drill holes in the soft soil layer of the construction site to form grouting holes; 2) Inject fluidized solidified soil into the grouting holes, and the fluidized solidified soil fills the grouting holes; the fluidized solidified soil is formed by stirring and mixing mud, water body and inorganic cementitious material, the mud is formed by stirring and mixing muck and water body, the inorganic cementitious material is in powder form and is formed by stirring and mixing slag powder, steel slag powder, fly ash, desulfurized ash, phosphogypsum, fly ash, red mud and stone powder; 3) Lower a sleeve valve pipe into the grouting hole, and the fluidized solidified soil forms a casing layer wrapped around the outer periphery of the sleeve valve pipe; the lower part of the sleeve valve pipe has a grouting section, the upper part of the sleeve valve pipe has a closed section, and the casing layer has an upper layer wrapped around the outer periphery of the closed section and a lower layer wrapped around the outer periphery of the grouting section; 4) Inject slurry through the sleeve valve pipe, and the slurry is formed by stirring and mixing inorganic cementitious material and water body; the slurry breaks through the lower layer and horizontally penetrates into the voids in the soft soil layer, and the slurry combines with the soft soil layer to form an integral consolidation body, and the upper layer restricts the slurry from deviating from the grouting section and seeping upward; 5) After the sleeve valve pipe grouting is completed, seal the grouting hole.

2. The sleeve valve pipe grouting construction method based on inorganic cementitious materials according to claim 1, characterized in that, In the construction step 2), the mud is formed by stirring and mixing waste muck and water body after soaking.

3. The sleeve valve pipe grouting construction method based on inorganic cementitious materials according to claim 2, characterized in that In the construction step 2), the waste muck is first crushed by a crusher, then screened and filtered by a sieve, soaked in water body for a set time, and then stirred and mixed with the water body to form the mud.

4. The sleeve valve pipe grouting construction method based on inorganic cementitious materials according to claim 3, characterized in that, In the construction step 2), after the waste muck is screened and filtered by a sieve, it is placed in a mud tank for standby, water body is added to the mud tank, and the water body is soaked and stirred with the waste muck until mud with a set fluidity is formed; The inorganic cementitious material and the water body are stirred and mixed in a mixer to form slurry, and according to a set ratio, mud is pumped from the mud tank into the mixer, and the mud and the slurry are stirred and mixed to form the fluidized solidified soil.

5. The sleeve valve pipe grouting construction method based on inorganic cementitious materials according to claim 4, wherein The stirring and mixing time of the mud and the slurry in the mixer is not less than 2 min.

6. The sleeve valve pipe grouting construction method based on inorganic cementitious materials according to any one of claims 1 to 5, characterized in that In the construction step 2), within a set time after the grouting holes are formed in the soft soil layer, fluidized solidified soil is injected from the bottom of the grouting holes, and the accumulated water and sediment in the grouting holes are squeezed by the fluidized solidified soil and discharged from the top of the grouting holes until the fluidized solidified soil completely replaces the accumulated water and sediment in the grouting holes, and the fluidized solidified soil fills the grouting holes.

7. The grouting construction method of the sleeve valve pipe based on inorganic cementitious materials according to claim 6, characterized in that, In the construction step 2), the drill rod of the geological drill is extended to the bottom of the grouting hole, and under the action of grouting pressure, the fluidized solidified soil is injected into the bottom of the grouting hole until the fluidized solidified soil completely replaces the accumulated water and sediment in the grouting holes.

8. The sleeve valve pipe grouting construction method based on inorganic cementitious materials according to any one of claims 1 to ⑤, characterized in that, In the construction step 4), the initial setting time of the fluidized solidified soil is 5 - 12 h, and the 28-day compressive strength is between 0.3 - 2.0 MPa. After 24 h when the fluidized solidified soil forms the casing layer, the first round of slurry injection is carried out through the sleeve valve pipe, and the grouting pressure is controlled between 1.2 MPa and 3.0 MPa. It should be noted that the "⑤" in the original text seems to be an incorrect or incomplete expression. It is recommended to check and correct it according to the actual situation.

9. The sleeve valve pipe grouting construction method based on inorganic cementitious materials according to any one of claims 1 to 5, characterized in that, In the construction step 2), a rotating disk that rotates horizontally is provided at the bottom of the slurry tank. A plurality of rolling shafts that roll horizontally are provided on the rotating disk, and the plurality of rolling shafts are arranged at intervals along the circumferential direction of the rotating disk. When the slurry is placed in the slurry tank, the rotating disk rotates horizontally, and the plurality of rolling shafts roll horizontally synchronously with the rotation of the rotating disk. The rotating disk and the rolling shafts agitate the slurry so that the slurry is in a stirred state.

10. The sleeve valve pipe grouting construction method based on inorganic cementitious materials according to any one of claims 1 to 5, characterized in that, In the construction step 2), during the process of injecting the slurry through the sleeve valve pipe, the grouting pressure is intermittently applied to the slurry to form an intermittent impact on the slurry, so that the slurry breaks through the lower layer. After the slurry breaks through the lower layer, gradually increase the grouting pressure of the slurry until the slurry reaches the penetration range.

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