Construction method of steel plate all-solid waste foam concrete underground diaphragm wall

Abstract

According to the construction method of the steel plate all-solid waste foam concrete underground diaphragm wall, all-solid waste foam concrete slurry is injected to form a concrete wall while stirring operation is conducted through a special machine, and a steel member sinks in the concrete wall. Comprising the following steps that S1, a construction method is selected for wall forming operation; a double-channel grouting system is arranged on the wall forming equipment; s2, blending all-solid-waste foam concrete slurry: mixing a solid-waste-based cementing material, a foaming agent, a foam stabilizer and an exciting agent in proportion; s3, slurry mixing is conducted, specifically, while the wall is formed, all-solid waste foam concrete slurry and foaming gas are injected through a double-channel grouting system; s4, the wall forming equipment is pulled out; s5, steel member arrangement, wherein H-shaped steel or a steel box is sunk into the concrete wall; and S6, curing is conducted, specifically, the formed underground diaphragm wall is cured, and wet and hot steam is introduced to accelerate the hydration reaction. By optimizing the mixed materials and the construction method, double improvement of low-carbon environmental protection and structural performance of the diaphragm wall is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of underground continuous wall construction, and particularly to a steel plate full solid waste foam concrete underground continuous wall construction method. BACKGROUND

[0002] The traditional underground continuous wall is an important enclosure structure form, and its standard construction process is: using a trenching machine along the axis of the deep foundation pit periphery, under the condition of mud protection, excavating a trench according to the designed thickness and depth, and then placing a reinforcement cage and pouring concrete to form a continuous underground reinforced concrete wall.

[0003] CN111827264A discloses a method for constructing an underground continuous wall using steel caisson technology. The construction method includes: using mechanical equipment to take soil inside the steel member, sinking the steel angle column and the caisson member between adjacent steel angle columns into the soil (i.e. using the traditional internal soil excavation method (sinking well process) to sink the steel member)...; replacing the mud inside the steel member with concrete to form a continuous underground steel plate concrete wall. SUMMARY

[0004] The purpose of the present application is to provide a steel plate full solid waste foam concrete underground continuous wall construction method, which realizes the dual improvement of low-carbon environmental protection and structural performance of the underground continuous wall by optimizing the mixed materials and construction method.

[0005] The present application is implemented by the following technical scheme: a steel plate full solid waste foam concrete underground continuous wall construction method, which uses wall forming equipment to inject full solid waste foam concrete slurry while stirring, forms a concrete wall by stirring with the original soil, and then sinks a steel member inside the concrete wall, including the following steps,

[0006] S1: selecting a construction method and performing wall forming operation, wherein a double-channel grouting system is arranged on the wall forming equipment, the double-channel grouting system is divided into a main channel and a secondary channel, the main channel is used to transport full solid waste foam concrete slurry, and the secondary channel is used to inject foaming gas under high pressure, wherein the end of the secondary channel extends to the periphery of the excavation and stirring structure of the wall forming equipment, and a microporous foaming plate is arranged at the end of the secondary channel;

[0007] S2: on-site preparation of full solid waste foam concrete slurry: mixing solid waste-based cementitious materials, foaming agent, foam stabilizer and activator in proportion, and forming full solid waste foam concrete slurry by stirring;

[0008] S3: mixing slurry: while performing S1 wall forming operation, injecting full solid waste foam concrete slurry and foaming gas through a double-channel grouting system; the full solid waste foam concrete slurry is injected in stages, wherein the first stage is to fill to 70% of the groove height at low pressure, and the second stage is to realize the expansion and self-compaction of the slurry-soil mixture in the form of pulse pressurization, wherein the foaming gas is discharged from the micro-porous foaming plate; wherein the weight of the full solid waste foam concrete slurry is 15%-25% of the weight of the original soil;

[0009] S4: pulling out the wall forming equipment: after the wall forming construction is completed and the slurry-soil mixture is realized, the wall forming equipment is taken out;

[0010] S5: steel member layout: sinking H-shaped steel or steel box in the uniform slurry-soil mixed concrete wall;

[0011] S6: maintenance stage: maintaining the formed underground continuous wall, and passing in hot steam to accelerate the hydration reaction.

[0012] Further, the weight parts of each component of the full solid waste foam concrete slurry in S2 are respectively 60-80 parts of solid waste-based cementitious material, 0.5-1.5 parts of foaming agent, 0.2-0.8 parts of foam stabilizer, and 2-5 parts of activator.

[0013] Further, the solid waste-based cementitious material comprises fly ash, steel slag micro powder and construction waste regenerated powder, and the weight parts of fly ash, steel slag micro powder and construction waste regenerated powder are in a ratio of 3:1.8-2.1:0.9-1.1. Further, the foaming agent is a protein-based biological foaming agent, the foam stabilizer is a nano-silica modified silicate, and the activator is a phosphogypsum and alkali-activated composite system.

[0014] Here, the phosphogypsum and alkali-activated composite system is obtained by reacting calcium sulfate dihydrate, which is an industrial by-product of phosphoric acid production, with an alkali activator (sodium hydroxide, calcium hydroxide, water glass). The principle is that the hydroxide ions provided by the high-alkali environment of the alkali activator will dissolve the calcium sulfate on the surface of the phosphogypsum, releasing divalent Ca ions. At the same time, the alkali activator reacts with the full solid waste foam concrete slurry to generate hydration products with cementitious ability; these products interweave and fill the pores, eventually forming a hardened body with strength.

[0015] In the present application, the phosphogypsum and alkali-activated composite system uses calcium sulfate dihydrate combined with sodium hydroxide, and the mass ratio of calcium sulfate dihydrate to sodium hydroxide is 3.5-5:1.

[0016] Further, the stirring method in S2 is three-stage stirring;

[0017] Primary stirring, dry mixing and activation of solid waste-based cementitious materials and activator, stirring condition is rotation speed 180~220rpm, lasting 2.5~3.5min;

[0018] Secondary stirring, foaming stirring of the product of primary stirring by injecting foaming agent solution, stirring condition is rotation speed 480~520rpm, lasting 2.5~3.5min, gas pressure is not more than 0.3MPa;

[0019] Tertiary stirring, homogenization of the product of secondary stirring by adding foam stabilizer at low speed, stirring condition is rotation speed 49~51rpm, lasting 2.5~3.5min, vacuum environment is not more than-0.08MPa.

[0020] Further, the temperature of the wet hot steam in S6 is 40~43℃.

[0021] Wherein, the construction method in S1 is TRD method, and the specific operation is that a saw chain type cutting box is placed and installed on site, connected with a TRD host machine, and a stirring process is arranged in the host machine, and a support and a double-channel grouting system are arranged on the saw chain type cutting box, wherein the double-channel grouting system is fixed through the support; the double-channel grouting system is provided with a plurality of branch lines extending to different areas of the saw chain in the saw chain type cutting box, and the end of the branch line of the guide gas path is connected with a microporous foaming plate.

[0022] Or the construction method in S1 is CSM method, and the specific operation is that a double-wheel milling cutter slot machine is placed on site, and stirring operation is performed through the double-wheel milling cutter slot machine, and a support and a double-channel grouting system are arranged on the double-wheel milling cutter slot machine, wherein the double-channel grouting system is fixed through the support; the end of the double-channel grouting system extends to the vicinity of the double-wheel milling cutter of the double-wheel milling cutter slot machine, and a microporous foaming plate is connected at the end of the secondary channel.

[0023] Or the construction method in S1 is a three-axis mixing pile method, and the specific operation is that a three-axis mixing pile machine is placed on site, and stirring operation is performed through the three-axis mixing pile machine, and a support and a double-channel grouting system are arranged on the three-axis mixing pile machine, wherein the double-channel grouting system is fixed through the support; the support is located between any two adjacent mixing piles, and the end of the double-channel grouting system extends to the bottom end of the mixing pile, and a microporous foaming plate is connected at the end of the secondary channel.

[0024] The beneficial effects of the present application are:

[0025] The application proposes a new construction technology of inserting steel components into the concrete wall, and the matching materials and construction machinery, that is, using special mechanical equipment to inject full solid waste foam concrete slurry to form a concrete wall while stirring, and then sinking the steel components in the concrete wall. The construction technology is neither a slurry protection wall trenching to build a reinforced concrete underground continuous wall, nor a soil excavation type caisson sinking method to build a steel plate concrete underground continuous wall. The material is not concrete but full solid waste (green and low carbon) foam concrete slurry. In order to solidify the full solid waste foam concrete slurry, a new formula and curing method are proposed.

[0026] The advantages of the application are as follows: 1. The use of full solid waste base material significantly reduces carbon emissions and greatly improves social benefits; 2. The construction process is simplified, from the traditional six steps of reinforced concrete underground continuous wall construction to two steps, that is, using mechanical equipment to form a concrete wall, and then inserting a steel box in the concrete wall. The construction efficiency is greatly improved, and the economic benefit is significantly improved; 3. The construction quality is significantly improved, and there is no quality problem of the wall width itself of the traditional reinforced concrete underground continuous wall and the problem of water leakage at the joint between the wall widths.

[0027] In summary, the application uses existing construction machinery to add a channel for full solid waste foam concrete slurry and gas injection into the soil, and uses mechanical equipment to excavate and stir the soil and slurry to transform it into concrete, and then sinks the steel components in the concrete to realize a new continuous wall construction technology. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 The construction flowchart of the application is shown in the figure. DETAILED DESCRIPTION

[0029] The application will be described in detail below in combination with the drawings:

[0030] Example 1,

[0031] As Figure 1 shown: the construction method is TRD method: including the following steps,

[0032] S1: the construction method is TRD method, the specific operation is to place and install a saw chain type cutting box on site, make it connected with the TRD host, set the stirring process in the TRD host, meanwhile, set up supports and multiple groups of double-channel grouting systems on the saw chain type cutting box, the double-channel grouting system is divided into a main channel and a secondary channel, the main channel is used for conveying full solid waste foam concrete slurry, the secondary channel is used for high-pressure injection of foaming gas, wherein the end of the secondary channel extends to the periphery of the excavating and stirring structure of the wall forming equipment, and the end of the secondary channel is provided with a microporous foaming plate; wherein the double-channel grouting system is fixed through the support; the end depth of any two groups of double-channel grouting systems is different, and the end of any double-channel grouting system extends to the direction of the saw chain in the saw chain type cutting box, and the end of the secondary channel is connected with a microporous foaming plate. The TRD host drives the saw chain type cutting box to vertically insert into the soil layer to the designed depth; the TRD host drives the saw chain type cutting box to move horizontally and form a mud wall;

[0033] It should be noted that the support here mainly plays the role of fixing the double-channel grouting system. Considering that the saw chain is a circle structure extending upward and downward, and the saw chain needs to inject slurry and air after starting operation, therefore, segmented grouting is needed here, if the main pipe branch pipe mode is adopted, control valves need to be set on the branch pipes, therefore, multiple groups of double-channel grouting systems with different end heights are directly adopted here, when the end of one group of double-channel grouting systems enters underground, the double-channel grouting system starts grouting and air injection.

[0034] S2: on-site preparation of full solid waste foam concrete slurry: mix solid waste-based cementitious materials, foaming agent, foam stabilizer and activator according to the proportion, and form full solid waste foam concrete slurry through stirring; wherein, according to the weight fraction, the weight fraction of each component of the full solid waste foam concrete slurry in S2 is 70 parts of solid waste-based cementitious materials, 1 part of foaming agent, 0.5 part of foam stabilizer and 3.5 parts of activator.

[0035] Further, the solid waste-based cementitious material contains fly ash, steel slag micro powder and construction waste regenerated micro powder, wherein the weight fraction ratio of fly ash, steel slag micro powder and construction waste regenerated micro powder is 3:2:1. The foaming agent is a protein-based biological foaming agent, the foam stabilizer is a nano-silica modified silicate, and the activator is a phosphogypsum and alkali activation composite system.

[0036] The phosphogypsum and alkali activation composite system adopts calcium sulfate dihydrate combined with sodium hydroxide, and the mass ratio of the two is 4:1.

[0037] After confirming the above ingredients, it needs to be stirred, and the stirring mode is three-stage stirring.

[0038] Primary stirring, dry mixing and activation of solid waste-based cementitious material and activator, stirring condition: rotation speed 200 rpm, duration 3 min; secondary stirring, foaming and stirring of the product of primary stirring by injecting foaming agent solution, stirring condition: rotation speed 500 rpm, duration 3 min, air pressure 0.3 MPa; tertiary stirring, homogenization of the product of secondary stirring by adding foam stabilizer at low speed, stirring condition: rotation speed 50 rpm, duration 3 min, vacuum environment -0.08 MPa.

[0039] S3: slurry mixing: while performing the wall forming operation, injecting the full-solid-waste foam concrete slurry and foaming gas through the double-channel slurry injection system respectively; the full-solid-waste foam concrete slurry is injected in stages, wherein the first stage is to fill to 70% of the groove height at low pressure, and the second stage is to realize the expansion and self-compaction of the slurry-soil mixture in a pulse pressurized manner; the foaming gas is discharged from the micro-porous foaming plate; the foaming gas here is CO2 or industrial waste gas. The purpose of the micro-porous foaming plate is to realize in-situ mixing of slurry-gas. In this embodiment, the weight of the full-solid-waste foam concrete slurry is 20% of the weight of the original soil;

[0040] S4: pulling out the wall forming equipment, after the wall forming construction is completed and the slurry-soil mixture is realized, the wall forming equipment is taken out;

[0041] S5: sinking H-shaped steel or steel box in the foam concrete wall with uniform slurry-soil mixture;

[0042] S6: curing stage: curing the formed underground diaphragm wall, and introducing 40-43℃ wet hot steam to accelerate the hydration reaction.

[0043] The above process is applied to a certain subway deep foundation pit engineering. The specific parameters are as follows:

[0044] The wall depth is 45 m, the cavity spacing is 1.2 m, and the single slurry injection amount is 2.8 m³;

[0045] The actual measured 28d strength of the foam concrete wall is 6.2 MPa, and the permeability coefficient is <1×10 -7 cm / s.

[0046] Compared with the traditional method, the cement consumption is saved by 12.3 tons per linear meter.

[0047] The performance of the structure is monitored, the dry density is ≤800 kg / m³, and the compressive strength is ≥1 MPa;

[0048] The thermal conductivity is ≤0.15 W / (m·K), and the structure has excellent thermal insulation performance.

[0049] Compared with the traditional process, the solid waste utilization rate of the present application is 95%, and the carbon emission is reduced by 62% compared with the traditional process.

[0050] Example 2,

[0051] The construction method is a CSM method, including the following steps,

[0052] S1: The construction method is a CSM method, and the specific operation is to place a double-wheel cutter trencher on site, to perform mixing operation through the double-wheel cutter trencher, to arrange a support and a double-channel grouting system on the double-wheel cutter trencher, to divide the double-channel grouting system into a main channel and a secondary channel, to use the main channel to convey full-solid waste foam concrete grout, and to use the secondary channel to inject high-pressure foaming gas, wherein the secondary channel extends to the periphery of the excavating and mixing structure of the wall forming equipment at the end, and a microporous foaming plate is arranged at the end of the secondary channel; wherein the double-channel grouting system is fixed through the support; the end of the double-channel grouting system extends to the vicinity of the double-wheel cutter of the double-wheel cutter trencher, and the end of the secondary channel is connected with the microporous foaming plate. The double-wheel cutter is vertically inserted into the soil layer to the designed depth. Here, it is only required to ensure that the outlet of the double-channel grouting system is located in the vicinity of the double-wheel cutter, and the rotation and excavation of the double-wheel cutter also synchronously realizes the mixing of the grout and the soil.

[0053] S2: On-site preparation of full-solid waste foam concrete grout: mixing solid waste-based cementitious materials, foaming agent, foam stabilizer and activator according to the proportion, and forming full-solid waste foam concrete grout through mixing; wherein, according to the weight fraction, the weight fraction of each component of the full-solid waste foam concrete grout in S2 is 70 parts of solid waste-based cementitious materials, 1 part of foaming agent, 0.5 part of foam stabilizer and 3.5 parts of activator.

[0054] Further, the solid waste-based cementitious material herein contains fly ash, steel slag micro powder and construction waste regenerated micro powder, wherein the weight fraction ratio of fly ash, steel slag micro powder and construction waste regenerated micro powder is 3:2:1.

[0055] The foaming agent is a protein-based biological foaming agent, the foam stabilizer is a nano-silica modified silicate, and the activator is a phosphogypsum and alkali activation composite system.

[0056] The phosphogypsum and alkali activation composite system adopts calcium sulfate dihydrate combined with sodium hydroxide, and the mass ratio of the two is 4:1.

[0057] After confirming the above ingredients, it is necessary to mix them, and the mixing method is three-stage mixing;

[0058] First-stage mixing, dry mixing and activation of solid waste-based cementitious materials and activator, mixing condition: rotation speed 200 rpm, duration 3 min;

[0059] Second-stage mixing, foaming and mixing of the product of the first-stage mixing by injecting foaming agent solution, mixing condition: rotation speed 500 rpm, duration 3 min, air pressure 0.3 MPa;

[0060] Third stage of stirring, adding a foam stabilizer to the product of the second stage of stirring, low speed homogenization, stirring conditions: 50 rpm for 3 min, vacuum environment: -0.08 MPa.

[0061] S3: slurry mixing: while performing the wall forming operation, injecting full solid waste foam concrete slurry and foaming gas through a double-channel grouting system; the full solid waste foam concrete slurry is injected in stages, wherein the first stage is to fill to 70% of the groove height at low pressure, and the second stage is to realize the expansion and self-compaction of the slurry-soil mixture in a pulse pressurized manner; it should be noted that the double-channel grouting system is divided into a main channel and a secondary channel. The main channel is used to transport the full solid waste foam concrete slurry, and the secondary channel is used to inject the foaming gas at high pressure. The foaming gas is CO2 or industrial waste gas.

[0062] S4: after the wall forming operation is completed and the slurry-soil mixture is realized, the double-wheel slot milling machine is pulled out;

[0063] S5: sinking H-shaped steel or steel box in the uniform slurry-soil mixture concrete wall;

[0064] S6: curing stage: curing the formed underground continuous wall, and introducing 40-43℃ wet hot steam to accelerate the hydration reaction.

[0065] Example 3,

[0066] The construction method is a tri-axial mixing pile method, which includes the following steps,

[0067] S1: the construction method is a tri-axial mixing pile method, the specific operation is to place a tri-axial mixing pile machine on site, perform mixing operation through the tri-axial mixing pile machine, and arrange a support and a double-channel grouting system on the tri-axial mixing pile machine. The double-channel grouting system is divided into a main channel and a secondary channel. The main channel is used to transport the full solid waste foam concrete slurry, and the secondary channel is used to inject the foaming gas at high pressure. The secondary channel extends to the periphery of the excavating and mixing structure of the wall forming equipment at the end, and a microporous foaming plate is arranged at the end of the secondary channel. The double-channel grouting system is fixed through the support. The support is located between any two adjacent mixing piles, the end of the double-channel grouting system extends to the bottom end of the mixing pile, and the microporous foaming plate is connected to the end of the secondary channel. The tri-axial mixing pile machine is vertically inserted into the soil layer to the designed depth. Here, as long as the outlet of the double-channel grouting system is located near the bottom end of the mixing pile of the tri-axial mixing pile machine, the rotation of the mixing pile also realizes the mixing of the slurry and the soil.

[0068] S2: On-site preparation of full-solid waste foam cement slurry: mix solid waste-based cementitious materials, foaming agent, foam stabilizer and activator according to the proportion, and form full-solid waste foam cement slurry by stirring; wherein, the weight fraction of each component of the full-solid waste foam cement slurry in S2 is 70 parts of solid waste-based cementitious materials, 1 part of foaming agent, 0.5 part of foam stabilizer and 3.5 parts of activator.

[0069] Further, the solid waste-based cementitious material herein includes fly ash, steel slag micro powder and construction waste regenerated micro powder, wherein the weight fraction ratio of fly ash, steel slag micro powder and construction waste regenerated micro powder is 3:2:1.

[0070] Wherein, the foaming agent is a protein-based biological foaming agent, the foam stabilizer is a nano-silica modified silicate, and the activator is a phosphogypsum and alkali activation composite system.

[0071] The phosphogypsum and alkali activation composite system uses calcium sulfate dihydrate combined with sodium hydroxide, and the mass ratio of the two is 4:1.

[0072] After confirming the above ingredients, it needs to be stirred, and the stirring mode is three-stage stirring;

[0073] First-stage stirring, dry mixing and activation of solid waste-based cementitious materials and activator, stirring condition is 200 rpm for 3 min;

[0074] Second-stage stirring, foaming agent solution is injected into the product of first-stage stirring for foaming stirring, stirring condition is 500 rpm for 3 min, gas pressure is 0.3 MPa;

[0075] Third-stage stirring, foam stabilizer is added into the product of second-stage stirring for low-speed homogenization, stirring condition is 50 rpm for 3 min, vacuum environment is-0.08 MPa.

[0076] S3: slurry mixing: while performing wall forming operation, full-solid waste foam cement slurry and foaming gas are injected through a double-channel grouting system respectively; the full-solid waste foam cement slurry is injected in stages, wherein the first stage is to fill the groove to 70% of the height at low pressure, and the second stage is to realize the expansion and self-compaction of the slurry-soil mixture in a pulse pressurization manner; it should be noted that the double-channel grouting system herein is divided into a main channel and a secondary channel. The main channel is used for conveying full-solid waste foam cement slurry, and the secondary channel is used for high-pressure injection of foaming gas, which is CO2 or industrial waste gas.

[0077] S4: after the wall forming construction is completed and the slurry-soil mixture is realized, the tri-axial mixer is pulled out;

[0078] S5: H-shaped steel or steel box is embedded in the cement wall with uniform slurry-soil mixture.

[0079] S6: maintenance stage: the formed underground continuous wall is maintained, and 40-43℃ humid hot steam is introduced to accelerate the hydration reaction.

[0080] Finally, it should be noted that the above only for the preferred embodiments of the present application, and is not intended to limit the application, although the foregoing embodiments of the application has been described in detail, for those skilled in the art, it still can be modified, or part of the technical features of the equivalent replacement, within the spirit and principles of the present application, any modification, equivalent replacement, improvement, etc., should be included within the scope of the present application.

Claims

1. A method for constructing a continuous underground wall using steel plate and solid waste foam concrete, characterized in that: The process involves simultaneously injecting solid waste foamed concrete slurry into the wall-forming equipment during mixing operations, mixing it with the original soil to form a concrete wall, and then sinking steel components within the concrete wall. The steps include the following: S1: Select the construction method and carry out the wall construction operation. A dual-channel grouting system is installed on the wall construction equipment. The dual-channel grouting system is divided into a main channel and a secondary channel. The main channel is used to transport solid waste foamed concrete slurry, and the secondary channel is used to inject foaming gas under high pressure. The end of the secondary channel extends to the periphery of the excavation and mixing structure of the wall construction equipment, and a microporous foaming plate is provided at the end of the secondary channel. S2: On-site preparation of all-solid-waste foamed concrete slurry: Mix solid waste-based cementitious materials, foaming agents, foam stabilizers and activators in proportion, and form all-solid-waste foamed concrete slurry by stirring; S3: Grouting: While performing the S1 wall-forming operation, a dual-channel grouting system is used to inject all-solid-waste foamed concrete slurry and foaming gas respectively. The all-solid-waste foamed concrete slurry is injected in stages. The first stage involves low-pressure filling to 70% of the trench height, and the second stage uses pulsed pressurization to achieve expansion and self-compactment of the slurry-soil mixture. The foaming gas is discharged from the microporous foaming plate. The weight of the all-solid-waste foamed concrete slurry is 15%-25% of the original soil weight. S4: Remove the wall-forming equipment: After the wall construction is completed and the grout-soil mixture is achieved, remove the wall-forming equipment; S5: Steel component placement: H-beams or steel boxes are inserted into the concrete wall where the grout and soil are evenly mixed. S6: Curing stage: Curing the formed underground continuous wall by introducing hot and humid steam to accelerate the hydration reaction.

2. The method for constructing a continuous underground wall using steel plate and all-solid-waste foam concrete as described in claim 1, characterized in that: By weight, the components of the all-solid-waste foamed concrete slurry in S2 are 60-80 parts of solid-waste-based cementitious material, 0.5-1.5 parts of foaming agent, 0.2-0.8 parts of foam stabilizer, and 2-5 parts of activator.

3. The method for constructing a continuous underground wall using steel plate and all-solid-waste foam concrete as described in claim 2, characterized in that: The solid waste-based cementitious material comprises fly ash, steel slag powder, and recycled construction waste powder, wherein the weight ratio of fly ash, steel slag powder, and recycled construction waste powder is 3:1.8~2.1:0.9~1.

1.

4. The method for constructing a continuous underground wall using steel plate solid waste foam concrete as described in claim 2, characterized in that: The foaming agent is a protein-based biological foaming agent, the foam stabilizer is nano-silica modified silicate, and the activator is a composite system of phosphogypsum and alkali activation.

5. The method for constructing a continuous underground wall using steel plate solid waste foam concrete as described in claim 1, characterized in that: The stirring method in S2 is three-stage stirring; Primary mixing is used to dry-mix and activate the solid waste-based cementitious material and activator. The mixing conditions are a speed of 180~220 rpm for 2.5~3.5 min. Secondary stirring involves injecting a foaming agent solution into the product of primary stirring for foaming and stirring. The stirring conditions are a speed of 480~520 rpm for 2.5~3.5 min and a gas pressure of no more than 0.3 MPa. Three-stage stirring: Add a foam stabilizer to the product from the second-stage stirring and homogenize at low speed. Stirring conditions: speed 49~51 rpm, duration 2.5~3.5 min, vacuum environment not greater than -0.08 MPa.

6. The method for constructing a continuous underground wall using steel plate and all-solid-waste foam concrete as described in claim 1, characterized in that: The temperature at which hot, moist steam is introduced into S6 is 40~43℃.

7. The method for constructing a continuous underground wall using steel plate and all-solid-waste foam concrete as described in claim 1, characterized in that: The construction method described in S1 is the TRD method. The specific operation involves placing and installing a saw chain cutting box on site, connecting it to the TRD host, and setting up a mixing process inside the TRD host. At the same time, a support frame and multiple sets of dual-channel grouting systems are installed on the saw chain cutting box, wherein the dual-channel grouting systems are fixed by the support frame. The end depths of any two sets of dual-channel grouting systems are different, and the end of any dual-channel grouting system extends to the direction of the saw chain in the saw chain cutting box. The end of the secondary channel in any dual-channel grouting system is connected to a microporous foaming board.

8. The method for constructing a continuous underground wall using steel plate and all-solid-waste foam concrete as described in claim 1, characterized in that: The construction method described in S1 is the CSM method. The specific operation involves placing a twin-wheel milling cutter groove machine on site and performing mixing operations through the twin-wheel milling cutter groove machine. A support frame and a dual-channel grouting system are installed on the twin-wheel milling cutter groove machine, wherein the dual-channel grouting system is fixed by the support frame. The end of the dual-channel grouting system extends to the vicinity of the twin-wheel milling cutter of the twin-wheel milling cutter groove machine, and the end of the secondary channel is connected to a microporous foaming board.

9. The method for constructing a continuous underground wall using steel plate and all-solid-waste foam concrete as described in claim 1, characterized in that: The construction method described in S1 is the three-axis mixing pile method. The specific operation involves placing a three-axis mixing pile machine on site and carrying out mixing operations through the three-axis mixing pile machine. A support frame and a dual-channel grouting system are installed on the three-axis mixing pile machine. The dual-channel grouting system is fixed by the support frame. The support frame is located between any two adjacent mixing piles. The end of the dual-channel grouting system extends to the bottom of the mixing pile, and the end of the secondary channel is connected to a microporous foaming board.

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