A method for backfilling foundation trenches based on premixed fluidized solidified soil

Abstract

This application relates to a method for backfilling foundation trenches based on premixed fluidized bed solidified soil, belonging to the technical field of foundation trench backfilling. The method includes: S1. Laying out the plan of the foundation treatment area; S2. Cleaning the natural foundation; S3. Erecting formwork and working platform; S4. Cleaning the pouring area and protecting the finished product; S5. Preparing and pouring the mixture; S6. Curing. The homogenizing equipment includes a mixing tank, a mixing component inside the mixing tank, a homogenizing component inside the mixing tank, and a defoaming component inside the mixing tank. This application further improves the homogeneity of the fluidized bed solidified soil during preparation and reduces air bubbles within the fluidized bed solidified soil.

Description

Technical Field

[0001] This application relates to the technical field of foundation trench backfilling, and in particular to a foundation trench backfilling construction method based on premixed fluidized solidified soil. Background Technology

[0002] In construction engineering, large amounts of waste mud and slag are generated during subway construction, exploration, pile foundation, drilling, and underground foundation pit excavation. This waste mud and slag is a multiphase stable colloidal suspension containing clay, organic and inorganic additives, oily waste, and drill cuttings, with a rather complex composition. In today's my country, where energy-saving, soil-saving, waste-utilizing, environmentally friendly, and functionally improved building materials are being vigorously developed, technicians often use a water washing method to separate mud and sand from the waste mud and slag. The sand is used for building materials, while the mud is cleaned of impurities, and then a solidifying and reinforcing agent and a drying and crack-preventing agent are added to create pre-flowed solidified soil for backfilling. Premixed fluidized solidified soil is a new type of building material. It makes full use of the soil from excavated trenches, foundation pits, or abandoned foundation soil. After adding a certain proportion of solidifying agent and water, it is thoroughly mixed to form a pumpable, fluid reinforcement material. It is used for backfilling and pouring of various trenches, foundation pits, and mine pits. It can also be widely used in the reinforcement of roadbeds, building foundations, etc. The bottom width of the trench is within 3 meters, and the length of the trench is more than 3 times the width. When backfilling the trench, technicians first mix the foundation soil, solidifying agent, water, etc. according to the ratio to form fluidized solidified soil. Then, the fluidized solidified soil is poured into the trench, and after the fluidized solidified soil solidifies, a stable trench is formed.

[0003] Regarding the aforementioned technologies, during the mixing process, the foundation soil, solidifying agent, and water need to be mixed in a mixing tank. Because the fluidity of solidified soil is superior to that of concrete, conventional mixing tanks are ineffective at mixing it during the mixing process, and they easily generate air bubbles within the solidified soil. After the solidified soil solidifies, these air bubbles affect the internal structure of the solidified soil and the strength of the foundation trench, making the trench prone to cracking and thus affecting its waterproofing performance. Summary of the Invention

[0004] To further improve the homogeneity of the prepared fluidized solidified soil and reduce air bubbles in the fluidized solidified soil, this application provides a method for backfilling foundation trenches based on premixed fluidized solidified soil.

[0005] The foundation trench backfilling construction method based on premixed fluidized solidified soil provided in this application adopts the following technical solution:

[0006] A method for backfilling foundation trenches based on premixed fluidized solidified soil includes the following steps:

[0007] S1. Laying out the plane of the foundation treatment area: Based on the site plane control network and the foundation treatment construction plan, the surveyors set out the positioning control stakes, elevation level stakes and the gray line dimensions of the trench for the foundation treatment location.

[0008] S2. Natural foundation clearing: Excavation and treatment of natural foundations with insufficient load-bearing capacity;

[0009] S3. Erect formwork and work platform, support wooden or brick formwork in the area to be poured, and seal and protect the joints;

[0010] S4. Clean up the pouring area and protect the finished product, remove garbage and tree roots from the foundation treatment area, and wrap the finished building structure with polyethylene film;

[0011] S5. Pouring: The homogenous mixing equipment is used to mix the materials to form a homogenous fluidized solidified soil. The mixed fluidized solidified soil is then poured into the pouring area by pumping or using a local chute.

[0012] S6. Curing: After pouring, watering should be carried out regularly, and plastic film or geotextile should be covered for heat preservation. The homogenizing and mixing equipment includes a mixing tank, a mixing component inside the mixing tank, a homogenizing component inside the mixing tank, and a defoaming component inside the mixing tank. The mixing component includes a mixing rod rotatably disposed inside the mixing tank, mixing blades on the mixing rod, and a power component for rotating the mixing rod. The homogenizing component includes a vibrating rod rotatably disposed inside the mixing tank, a vibrating block slidably disposed on the vibrating rod, and a sliding component for sliding the vibrating block. The defoaming component includes a defoaming block disposed on the mixing rod. The defoaming block is hollow and used to store defoaming agent. The defoaming block has a discharge port. The defoaming component also includes a discharge component that adjusts the amount of defoaming agent discharged according to the consistency of the fluidized solidified soil.

[0013] By adopting the above technical solution, when preparing the fluidized solidified soil, the technicians first pour the raw materials (foundation soil, solidifying agent, water) into the mixing tank, and then use the power component to drive the mixing rod and mixing blades to mix the raw materials, so that the raw materials are mixed evenly, thereby ensuring that the fluidized solidified soil in the foundation trench has uniform properties during subsequent pouring.

[0014] Then, the vibrating rod and vibrating block are moved. While stirring, the sliding component controls the vibrating block to slide up and down on the vibrating rod. During stirring, the fluidized solidified soil is stirred in the up and down direction. The vibration of the fluidized solidified soil carries out the air bubbles generated during stirring, reducing the residual air bubbles in the fluidized solidified soil, thereby reducing the impact of air bubbles in the fluidized solidified soil on the performance of the solidified foundation trench.

[0015] Simultaneously, the defoaming component, when mixing the fluidized solidified soil, controls the amount of defoamer discharged from the outlet according to the consistency of the fluidized solidified soil. This allows the defoamer to flow out from the outlet, eliminating air bubbles in the fluidized solidified soil and further reducing residual air bubbles. This results in uniform performance of the fluidized solidified soil, making the subsequent solidified foundation trench less prone to cracking and improving the waterproofing and stability of the foundation trench.

[0016] Optionally, the stirring rod is provided in multiple sets, and the multiple sets of stirring rods are arranged at intervals along the circumference of the stirring tank. The power component includes a rotating motor located at the top of the stirring rod, a sun gear located at the output end of the rotating motor, planet gears located on the stirring rod, and a gear ring located at the top of the stirring tank. The sun gear meshes with the planet gears, and the planet gears mesh with the gear ring.

[0017] By adopting the above technical solution, when it is necessary to mix the fluidized solidified soil, a rotating motor drives the sun gear to rotate, which in turn drives the planetary gears to rotate, thereby causing multiple sets of mixing rods to rotate. While the mixing rods rotate on their own axis, they also revolve around the sun gear, forming two rotating bodies that shear each other. This further improves the mixing efficiency and uniformity of the fluidized solidified soil during preparation. Moreover, by using a single rotating motor to drive multiple planetary gears, the operation is simple and saves power. At the same time, the multiple sets of mixing rods improve the mixing efficiency of the fluidized solidified soil, thereby improving the preparation efficiency of the fluidized solidified soil.

[0018] Optionally, the discharge assembly includes a sealing plate rotatably mounted on the defoaming block. The end of the sealing plate that is rotatably connected to the defoaming block protrudes from the defoaming block and is attached to the end side of the sealing plate protruding from the defoaming block. The larger the rotation angle of the sealing plate, the smaller the opening at the discharge port.

[0019] By adopting the above technical solution, when the mixing rod rotates, the sealing plate extends into the fluidized solidified soil. During rotation, the fluidized solidified soil generates resistance on the sealing plate, causing the sealing plate to rotate. When the fluidized solidified soil is relatively viscous, the resistance experienced by the sealing plate is large, resulting in a large rotation angle of the sealing plate. This leads to a smaller opening at the discharge port. Furthermore, the viscous fluidized solidified soil is less prone to generating bubbles. As a result, the small opening at the discharge port reduces the amount of defoamer flowing out, thereby achieving stable elimination of bubbles and reducing the waste of defoamer.

[0020] When the fluidized solidified soil is relatively thin, the resistance experienced by the sealing plate is small, resulting in a smaller rotation angle and a larger outlet opening. Thin fluidized solidified soil is more prone to generating bubbles during mixing, leading to a larger outflow of defoamer from the outlet, thus achieving stable bubble elimination. This setup enables stable defoaming of fluidized solidified soil with varying viscosities, saving on defoamer usage and eliminating the need for manual addition of defoamer.

[0021] Optionally, the vibrating rod is fixed to the axis of the sun gear, the sliding member includes a threaded sleeve provided on the vibrating rod, the vibrating block is threadedly adapted to the threaded sleeve, and the mixing tank is also provided with a limiting member for sliding and limiting the vibrating block.

[0022] By adopting the above technical solution, when the rotating motor drives the sun gear to rotate, the vibrating rod on the bottom side of the sun gear rotates. At this time, the limiting component restricts the rotation of the vibrating block, so that when the vibrating rod and the threaded sleeve rotate, the vibrating block does not easily follow the rotation. Since the threads of the vibrating block and the threaded sleeve are matched, when the vibrating rod rotates, the vibrating block is threaded on the vibrating rod. Therefore, under the action of the limiting component, the vibrating block slides up and down on the vibrating rod, stirring the fluidized solidified soil in the vertical direction, improving the homogeneity of the fluidized solidified soil, and reducing the residue of air bubbles in the fluidized solidified soil, thereby improving the waterproofness and strength index of the foundation trench during subsequent pouring and solidification.

[0023] Optionally, the limiting member includes a limiting rod disposed on the vibrating block, one end of the limiting rod being connected to the vibrating block and the other end being connected to the defoaming block, the defoaming block being slidably disposed on the stirring rod, and the sliding direction of the defoaming block being consistent with the sliding direction of the vibrating block.

[0024] By adopting the above technical solution, under the action of the limiting rod, the vibratory block is not easy to rotate in relative direction. Thus, when the vibratory rod rotates, the vibratory block moves along the length of the vibratory rod, stirring the fluidized solidified soil in the vertical direction, so that the sliding of the vibratory block is stable.

[0025] Optionally, the threaded sleeve has a bidirectional thread, and the vibrating block is reciprocatingly mounted on the vibrating rod.

[0026] By adopting the above technical solution, the bidirectional thread on the threaded sleeve causes the vibrating block to circulate and rise and fall on the threaded sleeve when the vibrating rod rotates, without the need for servo adjustment of the rotation direction of the rotating motor, making operation simple.

[0027] Optionally, the stirring rod is provided with a retaining ring, the defoaming block is provided with a partition, the partition is in contact with the outer peripheral wall of the retaining ring, the partition is provided with a flow hole, the flow hole is movably connected with the discharge port, and the discharge port is provided with a sealing element for movably sealing the discharge port.

[0028] By adopting the above technical solution, when preparing fluidized solidified soil, the vibrating block slides back and forth on the vibrating rod. Under the action of the limiting rod, the vibrating block drives the defoaming block to slide on the mixing rod. When the defoaming block slides, the retaining ring on the mixing rod slides relative to the vibrating block, thereby squeezing the defoamer in the vibrating block from the discharge port, realizing the defoaming operation in the fluidized solidified soil, reducing the residual air bubbles in the fluidized solidified soil, and the defoamer can be squeezed out with each movement cycle of the vibrating block. The operation is relatively simple. When no mixing operation is performed, the vibrating block remains stationary, so that the defoamer in the defoaming block is stably located in the cavity of the defoaming block, which is not easy to leak and waste. Furthermore, the stability of the discharge port is further improved by the setting of the sealing component, thereby further reducing the leakage of defoamer and thus reducing the waste of defoamer.

[0029] Optionally, the sealing element includes a sealing strip disposed at the discharge port, one end of which is connected to the outer wall of the partition, and the other end of which is movably overlapped with the outer wall at the discharge port.

[0030] By adopting the above technical solution, when the defoaming block slides on the mixing rod, when the retaining ring slides into the defoaming block, the sealing strip moves away from the discharge port, causing the discharge port to open and allowing the defoamer inside the defoaming block to be squeezed out from the discharge port. The defoamer flows out from the discharge port to defoam the fluidized solidified soil. When the retaining ring slides out of the defoaming block, a negative pressure is generated inside the defoaming block. At this time, the sealing strip and the partition plate are in contact, sealing the discharge port and making it difficult for external fluidized solidified soil to enter the cavity of the defoaming block from the discharge port.

[0031] Optionally, a guide tube is provided between the flow hole and the discharge port. The guide tube is arc-shaped, with one end of the guide tube flush with the bottom side of the flow hole and the other end flush with the bottom side of the discharge port.

[0032] By adopting the above technical solution, the flow guide pipe is set to guide the defoamer, so that the defoamer is guided from the defoamer block and smoothly enters the discharge port for defoaming. This reduces the problem of the defoamer remaining in the cavity of the defoamer block after flowing out and cannot be discharged smoothly, thereby improving the utilization rate of the defoamer.

[0033] Optionally, in step S1, elevation control lines need to be set on the completed structural exterior wall or template surface of the pit or trench sidewall, and in step S5, a layered pouring method is adopted, with each layer having a thickness of no more than 2m.

[0034] By adopting the above technical solution, using a layered pouring method and limiting the thickness of each layer to no more than 2m, the pouring quality of each layer of fluidized solidified soil is controllable, resulting in higher structural strength and better load-bearing capacity of each solidified soil layer after setting. Setting elevation control lines makes it easier to control the pouring elevation of each layer, thus improving the construction quality.

[0035] In summary, this application includes at least one of the following beneficial technical effects:

[0036] 1. By using the mixing, homogenizing, and defoaming components, the homogeneity of the fluidized solidified soil is achieved through simultaneous mixing, vibration, and defoaming during preparation. This ensures that the fluidized solidified soil in the foundation trench maintains uniform performance during subsequent pouring, reduces the amount of air bubbles remaining in the foundation trench, and thus reduces the problem of cracks caused by air bubbles after solidification, thereby improving the waterproof performance of the foundation trench.

[0037] 2. By using a sun gear, planetary gears, gear ring, mixing rods, defoaming blocks on the mixing rods, and sealing plates on the defoaming blocks, multiple mixing rods can be driven simultaneously by a single power source. Simultaneously, as the mixing rods rotate, the sealing plates adjust the size of the discharge port, thus defoaming is performed on fluidized solidified soil of varying thinness. This saves on defoaming agent usage and reduces waste.

[0038] 3. By setting a threaded sleeve on the vibrating rod, a vibrating block with threads set on the threaded sleeve, and a limiting rod set on the vibrating block and connected to the defoaming block, the vibrating block simultaneously stirs the fluidized solidified soil in the vertical direction during the mixing process, thereby further improving the uniformity of the mixing of the fluidized solidified soil and thus improving the homogeneity of the fluidized solidified soil. Attached Figure Description

[0039] Figure 1 This is a flowchart illustrating an embodiment of this application;

[0040] Figure 2 This is a schematic diagram of the connection structure of the homogenizing and stirring device in the embodiments of this application;

[0041] Figure 3 This is a schematic diagram of the connection structure of the stirring component, homogenizing component, and defoaming component inside the mixing tank in this application embodiment;

[0042] Figure 4 This is a schematic diagram of the connection structure of the stirring component, homogenizing component, and defoaming component from another perspective in an embodiment of this application;

[0043] Figure 5 This is a schematic diagram of the connection structure between the discharge component and the defoaming block;

[0044] Figure 6 This is a schematic diagram of the connection structure between the defoaming block and the discharge component.

[0045] Reference numerals: 1. Mixing tank; 2. Mixing assembly; 21. Mixing rod; 22. Mixing blade; 23. Power component; 231. Rotary motor; 232. Sun gear; 233. Planetary gear; 234. Gear ring; 31. Vibrating rod; 32. Vibrating block; 33. Sliding component; 331. Threaded sleeve; 34. Limiting component; 4. Defoaming assembly; 41. Defoaming block; 42. Defoaming chamber; 43. Discharge box; 431. Discharge port; 44. Baffle plate; 45. Retaining ring; 46. Flow hole; 47. Sealing strip; 5. Discharge assembly; 51. Sealing plate; 52. Rotating shaft; 53. Sealing spring. Detailed Implementation

[0046] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0047] This application discloses a method for backfilling foundation trenches based on premixed fluidized solidified soil. (Refer to...) Figure 1 A method for backfilling foundation trenches based on premixed fluidized solidified soil includes the following steps: S1. Laying out the plane of the foundation treatment area. Surveyors determine the excavation location and size of the foundation trench according to the site plane control network and the foundation treatment construction plan. They also set up positioning control stakes, elevation level stakes and trench dimensions for the foundation treatment location. At the same time, elevation control lines are set on the completed structural exterior walls or formwork surfaces of the pit or trench sidewalls to strictly control the pouring elevation and flatness.

[0048] S2. Natural foundation clearing: Collect the excavated foundation soil in a unified manner, excavate and treat the natural foundation with weak bearing capacity, and level and flatten the bottom wall of the foundation trench.

[0049] S3. Erect formwork and work platform, support wooden or brick formwork in the area to be poured, and seal the joints. In specific construction, materials such as sponge strips, foaming agents, and 0.4mm thick polyethylene film can be used to seal the gaps in the wooden formwork, or waterproof cement mortar can be applied to seal the joints of the brick formwork.

[0050] S4. Clean the pouring area and protect the finished product. Remove garbage, tree roots and other debris from the foundation treatment area, and wrap the finished building structure with polyethylene film. This can effectively solve the problem of the flow solidified soil mix ratio being affected by the increase or decrease of moisture at the contact surface of the filling body.

[0051] S5. Pouring: The mixed fluidized solidified soil is poured into the pouring area by pumping or local chute. During the pouring process, homogenization equipment is used to homogenize the soil after pouring, and a layered pouring method is adopted. The thickness of each layer should not exceed 2m, and the thickness of the first layer should not exceed 0.5m to avoid aggregate settling. The height difference between adjacent pouring areas should not exceed 1m. Specifically, pumping, chute, or bucket pouring methods can be used. The time from mixing the fluidized solidified soil to completion of pouring should be strictly controlled to not exceed 3 hours. When using any pouring method, the maximum drop height of the fluidized solidified soil during pouring should not exceed 10m to prevent segregation of the fluidized solidified soil. At the same time, the poured material should not directly impact the basement exterior wall and formwork support structure.

[0052] S6. Curing: After the pouring is completed, watering should be carried out regularly for curing. At the same time, plastic film or geotextile should be covered for heat preservation and curing. The curing time should not be less than 7 days, and the filling body should not be disturbed during the curing period.

[0053] Reference Figure 2 and Figure 3 The homogenizing and mixing equipment includes a vertically fixed mixing tank 1, a mixing component 2, a homogenizing component, and a defoaming component 4 disposed in the mixing tank 1.

[0054] The stirring assembly 2 includes multiple stirring rods 21 rotatably disposed in the stirring tank 1 and a power component 23 for driving the stirring rods 21 to rotate. The rotation axis of the stirring rods 21 is aligned with the height direction of the stirring tank 1, and multiple stirring blades 22 are fixedly connected to the stirring rods 21. The multiple stirring blades 22 are arranged alternately along the height direction of the stirring rods 21.

[0055] The power unit 23 includes a rotating motor 231 fixed to the top side of the mixing tank 1 and a sun gear 232 fixed to the output end of the rotating motor 231. A gear ring 234 is also fixedly connected to the top side of the mixing tank 1. The gear ring 234 and the sun gear 232 are arranged coaxially. Multiple planetary gears 233 mesh between the sun gear 232 and the gear ring 234. The multiple planetary gears 233 correspond one-to-one with multiple stirring rods 21, and the stirring rods 21 are fixedly connected to the shaft end face of the planetary gears 233. After the technicians pour the foundation soil, solidifying agent, and water into the mixing tank 1, they turn on the rotating motor 231. The rotating motor 231 drives the sun gear 232 to rotate, thereby driving the planetary gears 233 to rotate around the sun gear 232 while rotating on their own axis, thus homogenizing and mixing the fluidized solidified soil in the mixing tank 1, thereby improving the homogeneity of the fluidized solidified soil.

[0056] Furthermore, referring to Figure 3 and Figure 4The homogenizing component includes a vibrating rod 31 rotatably disposed in the mixing tank 1, the rotation axis of the vibrating rod 31 being consistent with the height direction of the mixing tank 1, and the homogenizing component also includes a vibrating block 32 slidably disposed on the vibrating rod 31, the sliding direction of the vibrating block 32 being consistent with the length direction of the vibrating rod 31, the vibrating rod 31 being fixedly connected to the end face of the sun gear 232 shaft, and the rotation axis of the vibrating rod 31 being consistent with the rotation axis of the mixing rod 21, and the homogenizing component also includes a sliding member 33 for slidingly driving the vibrating block 32;

[0057] When preparing the fluidized solidified soil, the rotating motor 231 drives the stirring rod 21 to rotate, stirring the fluidized solidified soil. At the same time, the vibrating rod 31 rotates to stir the fluidized solidified soil, further improving the preparation efficiency of the fluidized solidified soil. Meanwhile, the vibrating block 32 on the vibrating rod 31 slides up and down on the vibrating rod 31, stirring the fluidized solidified soil in the vertical direction, so that the fluidized solidified soil in the mixing tank 1 is stirred evenly and has uniform properties. At the same time, during the up and down movement of the vibrating block 32, air bubbles in the fluidized solidified soil are carried out, thereby reducing the residual air bubbles in the fluidized solidified soil, thus improving the waterproofness of the subsequent concrete in the foundation trench.

[0058] The sliding component 33 includes a threaded sleeve 331 fixedly connected to the vibrating rod 31. The outer periphery of the threaded sleeve 331 is provided with a bidirectional thread, and the vibrating block 32 is threadedly assembled on the threaded sleeve 331. The mixing rod 21 is also provided with a limiting component 34 for restricting the rotation of the vibrating block 32 with the vibrating rod 31. When the vibrating rod 31 rotates, it drives the threaded sleeve 331 to rotate. At this time, under the action of the limiting component 34, the vibrating block 32 is not easy to rotate with the threaded sleeve 331. At this time, the vibrating block 32 moves up and down on the threaded sleeve 331, thereby vibrating and mixing the fluidized solidified soil in the vertical direction and reducing the residue of air bubbles.

[0059] Reference Figure 4 , Figure 5 and Figure 6 The defoaming component 4 includes a defoaming block 41 disposed on the stirring rod 21. The defoaming block 41 is located between two sets of adjacent stirring blades 22 and is hollow inside. The inner cavity of the defoaming block 41 is a defoaming chamber 42, which contains defoaming agent. The defoaming block 41 has a discharge port 431, from which the defoaming agent flows out. The defoaming component 4 also includes a discharge component 5 that adjusts the size of the discharge port 431 according to the consistency of the fluidized solidified soil.

[0060] Because different fluidized solidified soils produce different amounts of bubbles during mixing and preparation, when the fluidized solidified soil is relatively thin, more bubbles are generated during mixing, and therefore more defoamer is needed. When the fluidized solidified soil is relatively thick, it is not easy to generate bubbles during mixing, and therefore less defoamer is needed. Therefore, in order to remove bubbles in the fluidized solidified soil while reducing the amount of defoamer used, the goal is to save resources.

[0061] A discharge box 43 is fixedly connected inside the defoaming block 41. The discharge box 43 is rectangular in shape. The discharge port 431 is located on one side of the discharge box 43. The other side of the discharge box 43 is connected to the defoaming chamber 42. The discharge assembly 5 includes a sealing plate 51 rotatably set at the discharge port 431. The rotation axis 52 of the sealing plate 51 is consistent with the length direction of the stirring rod 21. One end of the sealing plate 51 extends into the discharge port 431, and the other end extends out of the discharge port 431. A sealing spring 53 is fixedly connected to the side wall of the sealing plate 51. The other end of the sealing spring 53 is fixedly connected to the side wall of the discharge port 431. During the stirring process, when the stirring rod 21 rotates, the side of the sealing plate 51 away from the sealing spring 53 is the side facing the fluidized solidified soil.

[0062] When the fluidized solidified soil is prepared, the rotating motor 231 drives the stirring rod 21 and the vibrating rod 31 to stir the fluidized solidified soil. At the same time, the sealing plate 51 is in contact with the fluidized solidified soil. When the fluidized solidified soil is relatively thin, the resistance of the fluidized solidified soil to the sealing plate 51 is small. Therefore, the rotation angle of the sealing plate 51 is small and the opening of the discharge port 431 is large. This facilitates the discharge of defoamer, thereby stabilizing and eliminating air bubbles in the fluidized solidified soil, reducing the residual air bubbles in the fluidized solidified soil, and thus improving the uniformity and waterproofness of the fluidized solidified soil after solidification in the foundation trench.

[0063] When the fluidized solidified soil is relatively thick, the resistance of the fluidized solidified soil to the sealing plate 51 is relatively large. When the stirring rod 21 rotates, the rotation angle of the sealing plate 51 is relatively large. One end of the sealing plate 51 that extends into the discharge port 431 is closer to the inner wall of the discharge box 43, and the other end of the sealing plate 51 is closer to the other inner wall of the discharge port 431. This reduces the effective discharge area of ​​the discharge port 431, reduces the discharge of defoamer, and thus reduces the waste of defoamer.

[0064] Simultaneously, the limiting component 34 that limits the movement of the vibrating block 32 includes a limiting rod fixed to the vibrating block 32. Multiple sets of limiting rods are provided, and each set corresponds to one defoaming block 41. One end of each limiting rod is fixedly connected to the vibrating block 32, and the other end is fixedly connected to the defoaming block 41. The discharge port 431 is located on the side of the defoaming block 41 furthest from the connection with the limiting rod. The defoaming block 41 is slidably mounted on the stirring rod 21, and the sliding direction of the defoaming block 41 is proportional to the height of the stirring rod 21. The direction is consistent. A partition 44 is fixedly connected inside the defoaming block 41. The partition 44 is divided into a vertical part parallel to the stirring rod 21 and a horizontal part perpendicular to the stirring rod 21. The partition 44 divides the defoaming chamber 42 into a cavity for storing defoaming agent and a cavity for storing storage box. A retaining ring 45 is coaxially fixedly connected to the stirring rod 21. The retaining ring 45 fits against the vertical part of the partition 44. A flow hole 46 is formed on the partition 44. The flow hole 46 is movably connected to the discharge port 431.

[0065] When the vibrating rod 31 rotates, driving the vibrating block 32 to rise and fall, the defoaming block 41 slides and rises and falls on the mixing rod 21 under the action of the limiting rod. At this time, the retaining ring 45 moves relative to the partition plate 44, thereby squeezing the defoaming chamber 42 and squeezing the defoaming agent in the defoaming chamber 42 out of the flow hole 46, and then flowing out from the discharge port 431. During the mixing process, the vibrating block 32 rises and falls back and forth, squeezing the defoaming agent into the fluidized solidified soil in a cycle. Then, under the action of the mixing blade 22, the defoaming agent is evenly distributed into the fluidized solidified soil, thereby achieving stable defoaming of the fluidized solidified soil in the mixing tank 1, reducing the uneven defoaming performance caused by adding the defoaming agent into the mixing tank 1 at one time, thereby improving the homogeneity and performance uniformity of the fluidized solidified soil.

[0066] To ensure the stable flow of defoamer from the flow hole 46 out of the outlet 431, a guide pipe is fixedly connected between the outlet 431 and the flow hole 46. The height of the flow hole 46 is higher than that of the outlet 431, and the guide pipe is arranged in an arc shape. One end of the guide pipe extends into the outlet 431 and is fixed to the inner wall of the outlet 431, while the other end extends into the flow hole 46 and is fixed to the inner wall of the flow hole 46. Therefore, when the defoamer block 41 slides and rises on the stirring rod 21 to squeeze out the defoamer, the defoamer squeezed out from the flow hole 46 is guided to the outlet 431 through the guide pipe to achieve stable defoaming of the fluidized solidified soil.

[0067] Meanwhile, as the defoaming block 41 rises and falls within the stirring rod 21, it easily creates negative pressure within the defoaming chamber 42, which can easily draw the fluidized solidified soil from the mixing tank 1 into the defoaming chamber 42. To address this issue, a sealing component is provided within the discharge box 43. This sealing component includes a sealing strip 47 rotatably positioned within the discharge box 43 on the side furthest from the discharge port 431. The sealing strip 47 is arranged at an angle, with its rotation axis perpendicular to the length direction of the stirring rod 21. The end of the sealing strip 47 furthest from the rotatably connected discharge box 43 is movably pressed against the inner bottom wall of the discharge box 43. One end of the moving connection is positioned closer to the discharge port 431; therefore, when the retaining ring 45 moves into the defoaming chamber 42 and squeezes the defoamer out of the defoaming chamber 42, the sealing strip 47 rotates towards the discharge port 431, thereby achieving normal extrusion of the defoamer; when the retaining ring 45 moves out of the defoaming chamber 42, a negative pressure is generated in the defoaming chamber 42. At this time, the sealing strip 47 moves away from the discharge port 431 under the action of the negative pressure, thereby making the sealing strip 47 press against the inner wall of the discharge box 43, making it difficult for the fluidized solidified soil to enter the guide pipe, thereby reducing the pollution of the defoamer and improving the extrusion efficiency of the defoamer.

[0068] The implementation principle of the foundation trench backfilling construction method based on premixed fluidized solidified soil in this application embodiment is as follows: When treating the foundation using the process described in this application, the problem of the fluidized solidified soil mix ratio not being affected by the increase or decrease of moisture at the contact surface of the backfill body can be solved by setting up a polyethylene film wrapping. Furthermore, by pouring in layers and controlling the drop height, the quality hazards such as segregation due to drop, aggregate sinking due to excessive thickness in one pour, and uneven surface and slanted cold joints caused by excessive pouring area can be effectively prevented. Moreover, the overall construction quality is controllable and it is effectively applicable to areas with limited space. The premixed fluidized solidified soil used in the pouring is made from recycled construction waste or industrial waste, which improves the recycling of waste resources. At the same time, there is no dust pollution during the construction process, which is more in line with the construction requirements of "energy saving and environmental protection".

[0069] Simultaneously, during the preparation of the fluidized solidified soil, technicians first add the base soil, solidifying agent, and water into the mixing tank 1. By rotating the motor 231, the sun gear 232 rotates, which in turn drives the planetary gears 233, causing the mixing rod 21 and the vibrating rod 31 to rotate. This mixes the fluidized solidified soil, achieving its homogeneity. Simultaneously, as the vibrating rod 31 rotates, the threaded sleeve 331 rotates, causing the vibrating block 32 to slide up and down on the vibrating rod 31, vertically mixing the fluidized solidified soil and further improving its homogeneity. This results in uniform performance of the fluidized solidified soil. Furthermore, as the vibrating block 32 slides up and down, the limiting rod... While limiting the movement, the defoaming block 41 slides on the stirring rod 21, causing the defoaming block 41 to move relative to the retaining ring 45. This allows the defoaming agent in the defoaming chamber 42 to flow out from the discharge port 431 to defoam the fluidized solidified soil. Due to the structure of the planetary gear 233, the stirring rod 21 will revolve around the sun gear 232 when it rotates. At this time, the sealing plate 51 will rotate under the resistance of the fluidized solidified soil, thus changing the effective discharge opening of the discharge port 431. This allows for defoaming according to the different concentrations of the fluidized solidified soil, saving the amount of defoaming agent used while achieving stable defoaming and improving the mechanical properties and waterproofing performance of the fluidized solidified soil after solidification in the trench.

[0070] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A method for backfilling foundation trenches based on premixed fluidized solidified soil, characterized in that: Includes the following steps: S1. Laying out the plane of the foundation treatment area: Based on the site plane control network and the foundation treatment construction plan, the surveyors set out the positioning control stakes, elevation level stakes and the gray line dimensions of the trench for the foundation treatment location. S2. Natural foundation clearing: Excavation and treatment of natural foundations with insufficient load-bearing capacity; S3. Erect formwork and work platform, support wooden or brick formwork in the area to be poured, and seal and protect the joints; S4. Clean up the pouring area and protect the finished product, remove garbage and tree roots from the foundation treatment area, and wrap the finished building structure with polyethylene film; S5. Pouring: Homogeneous mixing equipment is used to mix the soil to form a homogeneous fluidized solidified soil. The mixed fluidized solidified soil is then poured into the pouring area by pumping or local chute. S6. Curing: After pouring, water should be sprayed regularly for curing, and plastic film or geotextile should be covered for heat preservation. The homogenizing and mixing equipment includes a mixing tank (1), a mixing component (2) disposed in the mixing tank (1), a homogenizing component disposed in the mixing tank (1), and a defoaming component (4) disposed in the mixing tank (1). The stirring assembly (2) includes a stirring rod (21) rotatably disposed in the stirring tank (1), stirring blades (22) disposed on the stirring rod (21), and a power component (23) for rotating the stirring rod (21). The homogenizing component includes a vibrating rod (31) rotatably disposed in a mixing tank (1), a vibrating block (32) slidably disposed on the vibrating rod (31), and a sliding member (33) for slidingly driving the vibrating block (32). The defoaming component (4) includes a defoaming block (41) disposed on the stirring rod (21). The defoaming block (41) is hollow and is used to store defoaming agent. The defoaming block (41) has a discharge port (431). The defoaming component (4) also includes a discharge component (5) that adjusts the amount of defoaming agent discharged according to the consistency of the fluidized solidified soil. The discharge assembly (5) includes a sealing plate (51) rotatably mounted on the defoaming block (41). The sealing plate (51) is partially located in the discharge port (431). The end of the sealing plate (51) that is rotatably connected away from the defoaming block (41) protrudes from the defoaming block (41). The end of the sealing plate (51) protruding from the defoaming block (41) is in contact with the fluidized solidified soil. The larger the rotation angle of the sealing plate (51), the smaller the opening at the discharge port (431). The sliding member (33) includes a threaded sleeve (331) provided on the vibrating rod (31), the vibrating block (32) is threadedly adapted to the threaded sleeve (331), and the mixing tank (1) is also provided with a limiting member (34) for sliding and limiting the vibrating block (32). The limiting member (34) includes a limiting rod disposed on the vibrating block (32), one end of the limiting rod is connected to the vibrating block (32) and the other end is connected to the defoaming block (41), the defoaming block (41) is slidably disposed on the stirring rod (21), and the sliding direction of the defoaming block (41) is consistent with the sliding direction of the vibrating block (32); The threaded sleeve (331) is provided with a bidirectional thread, and the vibrating block (32) is reciprocatingly mounted on the vibrating rod (31).

2. The method for backfilling foundation trenches based on premixed fluidized solidified soil according to claim 1, characterized in that: The stirring rod (21) is provided in multiple sets, and the multiple sets of stirring rods (21) are arranged at intervals along the circumference of the mixing tank (1). The power component (23) includes a rotating motor (231) on the top of the stirring rod (21), a sun gear (232) on the output end of the rotating motor (231), a planet gear (233) on the stirring rod (21), and a gear ring (234) on the top of the mixing tank (1). The sun gear (232) meshes with the planet gear (233), and the planet gear (233) meshes with the gear ring (234).

3. The method for backfilling foundation trenches based on premixed fluidized solidified soil according to claim 1, characterized in that: The stirring rod (21) is provided with a retaining ring (45), and the defoaming block (41) is provided with a partition (44). The partition (44) is in contact with the outer peripheral wall of the retaining ring (45). The partition (44) is provided with a flow hole (46). The flow hole (46) is movably connected to the discharge port (431). The discharge port (431) is provided with a sealing component to movably block the discharge port (431).

4. The method for backfilling foundation trenches based on premixed fluidized solidified soil according to claim 3, characterized in that: The sealing component includes a sealing strip (47) disposed at the discharge port (431), one end of which is connected to the outer wall of the partition (44), and the other end of which is movably overlapped with the inner wall of the discharge port (431).

5. A method for backfilling foundation trenches based on premixed fluidized solidified soil according to claim 4, characterized in that: A guide tube is provided between the flow hole (46) and the discharge port (431). The guide tube is arc-shaped, with one end of the guide tube flush with the bottom side of the flow hole (46) and the other end flush with the bottom side of the discharge port (431).

6. The method for backfilling foundation trenches based on premixed fluidized solidified soil according to claim 1, characterized in that: In step S1, elevation control lines need to be set on the completed structural exterior wall or template surface of the pit or trench sidewall, and in step S5, a layered pouring method is adopted, with each layer having a thickness of no more than 2m.

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