Vibration pouring construction method and system for backfilling fluid soil without protective layer

Abstract

The invention relates to the technical field of building construction, in particular to a vibration pouring construction method and system for backfilling fluid soil without a protective layer. The method comprises the following steps: preparing a fluid-state solidified soil material; detecting the quality of the prepared flow-state solidified soil material; carrying out layered pouring on the construction site by utilizing the flow-state solidified soil material which is qualified in quality detection; and acceptance inspection is conducted after pouring is completed. The flow-state soil is conveyed to the backfilling area through the conveying equipment, continuous pouring of the ultra-long distance larger than 100 m is conducted from one end, and in the pouring process, the flow dividing device can be arranged according to needs, and it is ensured that the flow-state soil is evenly distributed.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a vibration pouring construction method and system for backfilling fluidized soil without a protective layer. Background Art

[0002] With the development of construction engineering technology, the application of fluidized soil has gradually emerged in some construction scenarios such as foundation treatment and fertilizer tank backfilling. It can be conveniently filled to the designated location by means of pipeline pumping and other methods. As a filling material, fluidized soil is more closely integrated with the base layer to form an integral structure. Fluidized soil is mainly composed of raw soil, water, and curing agent. During the construction process, if the mixing is uneven or the standing time is too long, the raw soil will easily precipitate, resulting in material segregation and agglomeration. For example, when pumping fluidized soil over a long distance of more than 100 meters, the raw soil and water will separate due to pressure changes and flow state differences in the pipeline, causing the pump pipe to be blocked. Pump pipe blockage is a common and difficult problem. Blockage will not only affect the construction progress, but may also cause equipment damage and engineering quality problems. Among them, agglomeration in the pump pipe is one of the main causes of blockage.

[0003] The traditional method of exterior wall waterproofing is usually to set up a waterproof layer and then make a waterproof protective layer. The construction process is complicated, the construction period is long, and the waterproofing quality is difficult to guarantee.

[0004] In order to solve such problems, it is urgent to propose a new type of construction method for ultra-long distance vibration pouring of more than 100 meters without protective layer backfilling fluidized soil. Summary of the invention In order to solve the above-mentioned problems, the present invention provides a vibration pouring construction method and system for backfilling fluidized soil without a protective layer. This method can solve the problems of agglomeration and blockage of fluidized soil during ultra-long pumping of more than 100 meters, low pumping efficiency, numerous protective layer construction procedures, and long construction period.

[0005] In the first aspect, the present invention provides a vibration pouring construction method for backfilling fluidized soil without a protective layer, which adopts the following technical scheme: A vibrating pouring construction method for backfilling fluidized soil without a protective layer, comprising: Preparation of fluidized solidified soil materials; Conduct quality inspection on the prepared fluidized solidified soil materials; Use the fluidized solidified soil materials that have passed the quality inspection to cast the construction site in layers; Acceptance inspection is carried out after pouring is completed.

[0006] Furthermore, the preparation of the fluidized solidified soil material includes supplying filling materials through a mobile mixing station, and the filling materials include cement, a curing agent, plain soil and water for the mixture; wherein the filling materials are mixed with a forced mixer, and the output of the mixer is adjusted according to the construction progress.

[0007] Furthermore, the preparation of the fluidized solidified soil material also includes the ratio of the base soil, the curing agent and the mixing water being 0.74:0.2:0.06; wherein the cement and base soil are first added to the mixer, and then 3 / 4 of the mixing water is added, and after stirring for 20 seconds, the curing agent and the remaining mixing water are added.

[0008] Furthermore, the quality inspection of the prepared fluidized solidified soil material includes density inspection and strength inspection of the fluidized solidified soil material, and simultaneously inspection of the flow expansion, wet bulk density, strength, setting time, permeability coefficient, water stability coefficient and volume water absorption rate of the fluidized solidified soil material.

[0009] Furthermore, the strength test includes making the fluidized solidified soil material into a prismatic specimen with a size of 100mm×100mm×400mm, curing the specimen in a standard curing room, and testing the pressure using a pressure testing machine after the curing is completed, and recording the maximum pressure when the specimen is destroyed.

[0010] Furthermore, the construction site is poured in layers using the fluidized solidified soil material that has passed the quality inspection, including cleaning the base of the construction site and then pouring in layers according to the design requirements and site conditions. After the top layer of the fill body is poured, the surface of the fill body is immediately covered with a plastic sheet or geotextile for moisturizing and curing. Among them, the foundation trench backfill is poured in sections, and the fluidized solidified soil is poured in layers and blocks.

[0011] Furthermore, the layered pouring of the fluidized solidified soil material that has passed the quality inspection also includes, during the pouring process, vibrating the fluidized solidified soil material in the pump pipe using a vibration table to increase the fluidity of the fluidized solidified soil material and eliminate the pump blocking phenomenon of the fluidized solidified soil material.

[0012] Furthermore, an acceptance inspection is carried out after the pouring is completed, including surface flatness detection, crack detection, flexural strength detection and density detection in sequence after the pouring is completed.

[0013] Furthermore, the density test includes using a sampling tool to randomly sample in the fluidized solidified soil construction area according to certain rules, calculating the wet density of the sample according to the wet density formula, then measuring the dry density by drying the sample, and calculating the relative density based on the dry density and wet density.

[0014] In a second aspect, a vibrating pouring construction system for backfilling fluidized soil without a protective layer comprises: Mobile mixing station, including forced mixer, is used to mix the filling material raw materials evenly into fluidized solidified soil materials, and transport the fluidized solidified soil materials to the site through transportation equipment; A material quality detection device, including a density detection module and a strength detection module; The pouring device includes a pump pipe and a vibration table, wherein the vibration table is used to vibrate the fluidized solidified soil material in the pump pipe to increase the fluidity of the fluidized solidified soil material and eliminate the pump blocking phenomenon of the fluidized solidified soil material; The acceptance device includes a flatness inspection module, a crack inspection module, a flexural strength inspection module and a density inspection module.

[0015] In summary, the present invention has the following beneficial technical effects: 1. The present invention transports the fluidized soil to the backfill area through a conveying device, and performs continuous pouring over an ultra-long distance of more than 100 meters from one end. During the pouring process, a diversion device can be set as needed to ensure uniform distribution of the fluidized soil.

[0016] 2. The vibration device can generate vibrations of specific frequency and amplitude, and the vibration parameters can be adjusted according to different construction requirements to adapt to different types of fluid soil and construction conditions to ensure the density and uniformity of backfill.

[0017] 3. The ultra-long distance vibration pouring of more than 100 meters of the present invention can complete a large range of construction tasks at one time, reduce the treatment of construction joints, and further improve construction efficiency.

[0018] 4. Use the good impermeability and low settlement performance of fluidized solidified soil to replace the traditional waterproof protective layer. This realizes the construction of external wall waterproof protective layer, saves the material and construction cost of the protective layer, reduces the total cost of the project, saves time, and speeds up the overall project progress. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The present invention is a flowchart of a vibration pouring construction method for backfilling fluidized soil without a protective layer according to an embodiment of the present invention. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0021] Example 1 Reference Figure 1 The present embodiment provides a vibration pouring construction method for backfilling fluidized soil without a protective layer, comprising: Preparation of fluidized solidified soil materials; Conduct quality inspection on the prepared fluidized solidified soil materials; The fluidized solidified soil materials that have passed the quality inspection are poured in layers; Acceptance inspection is carried out after pouring is completed.

[0022] Specifically, Step 1: Preparation of fluidized solidified soil materials, including supplying filling materials through a mobile mixing station, the filling materials including cement, curing agent, plain soil and water for mixing; wherein, a forced mixer is used to mix the filling materials, and the output of the mixer is adjusted according to the construction progress. The following steps are included: 1. Soil material selection: Soil with good particle gradation should be used first, such as silty clay or silt. Avoid using soil containing too much organic matter and too many impurities (such as tree roots, garbage, etc.).

[0023] 2. Accurately weigh the curing agent according to the design requirements. The amount used will vary depending on the properties of the soil and the project's requirements for the strength of the cured soil.

[0024] 3. Use clean water, such as tap water or well water that has passed inspection. The amount of water used should also be strictly controlled.

[0025] 4. Mixing and stirring: Dry mixing: First, put the soil and curing agent into the mixer for dry mixing, so that the curing agent can be evenly coated on the surface of the soil particles. The dry mixing time is usually not less than 30 seconds to ensure that the soil and curing agent are fully mixed.

[0026] Wet mixing: After dry mixing, add the prepared water for wet mixing. During the mixing process, pay attention to the state of the solidified soil. The wet mixing time is generally 2-3 minutes, so that the solidified soil forms a uniform flow state with good fluidity and plasticity, which is convenient for subsequent pouring construction.

[0027] Step 2, the preparation of the fluidized solidified soil material also includes the ratio of the base soil, the curing agent and the mixing water being 0.74:0.2:0.06; wherein the cement and base soil are first added to the mixer, and then 3 / 4 of the mixing water is added, and after stirring for 20 seconds, the curing agent and the remaining mixing water are added.

[0028] Step 3: Conduct quality inspection on the prepared fluidized solidified soil material, including inspection of the flow expansion, wet bulk density, strength, setting time, permeability coefficient, water stability coefficient and volume water absorption rate of the fluidized solidified soil material.

[0029] Among them, the density detection principle is: the density is calculated by measuring the mass and volume of the solidified soil. The mass can be accurately weighed with a balance, and the volume can be measured by the water displacement method. The density can reflect the compactness of the solidified soil, thereby inferring its strength and other related properties.

[0030] Density detection process: Use an electronic balance to weigh a certain mass of solidified soil sample, then use the drainage method to place the sample into a measuring cylinder filled with water, read the volume change before and after the measuring cylinder, and use the density formula to calculate the density.

[0031] Strength test principle: For the solidified soil structure that bears the load, the flexural strength is very important. The solidified soil specimen is regarded as a beam structure, and a concentrated load is applied to the middle of the specimen, and tensile stress is generated at the bottom of the specimen. When the tensile stress exceeds the tensile strength of the solidified soil, cracks appear at the bottom of the specimen and expand upward, eventually breaking. The flexural strength reflects the ability of the solidified soil to resist bending failure.

[0032] Strength test process: Make a prism specimen with a size of 100mm×100mm×400mm from the fluidized solidified soil. Place the specimen in a standard curing room (temperature 20±2℃, relative humidity above 95%) for 28 days. After curing, use a pressure testing machine to test the pressure, and record the pressure and deformation of the specimen at the same time until the specimen is destroyed, and record the maximum pressure at the time of destruction.

[0033] Step 4: Layered pouring of the fluidized solidified soil material that has passed the quality inspection, including layered pouring according to the design requirements and site conditions after cleaning the base, and film covering and curing after pouring. The foundation trench backfill is poured in sections, and the fluidized solidified soil is poured in layers and blocks. The pouring process includes: 1. Base treatment: clean up the loose soil and debris on the surface of the foundation, level the foundation, and properly protect the slope of the foundation pit to prevent the collapsed soil from mixing into the solidified soil.

[0034] 2. When the foundation trench backfill needs to be poured in sections, a 120mm thick sand-lime brick retaining wall with M5 mortar is required to be built at one or both ends of the solidified soil pouring point for blocking. Because the solidified soil has strong fluidity and the lateral pressure during pouring is relatively large, the sand-lime brick retaining wall used for blocking must be firm. When using a formwork for blocking, the support should be stable and firm.

[0035] 3. The fluidized solidified soil should be poured in layers and blocks. The initial setting and final setting time of the solidified soil are 6 hours and 12 hours respectively. The upper layer pouring operation should be carried out after the lower layer has finally set.

[0036] 4. During the backfilling of fluidized soil, check the elevation control line on the side wall of the pit (trench) to ensure that each pouring layer is basically horizontal. Construction machinery and personnel should be reasonably allocated during pouring to ensure a balanced process. Solidified soil should be poured in layers. The first pouring thickness should not exceed 500mm, the pouring thickness should not exceed 2000mm each time, and the height difference between adjacent areas should not exceed 1000mm (T / BGEA 001-2019 "Technical Standard for Premixed Fluidized Solidified Soil Filling Engineering").

[0037] 5. After pouring is completed, it should be covered and maintained immediately to prevent moisture loss. During this period, machinery and pedestrians are strictly prohibited from passing through.

[0038] 6. After pouring the top layer of the fill, the surface of the fill should be immediately covered with plastic sheet or geotextile for moisturizing maintenance, and the maintenance time should be no less than 7 days.

[0039] Step 5, pouring the fluidized solidified soil material that has passed the quality inspection in layers, also includes using a vibration table to vibrate the fluidized solidified soil material in the pump pipe during the pouring process to increase the fluidity of the fluidized solidified soil material and eliminate the pump blocking phenomenon of the fluidized solidified soil material.

[0040] The vibration table generates high-frequency vibrations and transmits the vibrations to the pump pipe. When the pump pipe is vibrated, the particles in the fluidized solidified soil material in the pipe will change their original static state under the action of the vibration.

[0041] For fluidized solidified soil, vibration reduces the friction between soil particles, allowing air bubbles in the solidified soil to be discharged more easily, while allowing the curing agent, water and soil particles to be better mixed. This uniform vibration helps the solidified soil material maintain good fluidity in the pump pipe and form a denser structure after pouring, improving its strength and stability.

[0042] Steps: 1. Equipment preparation: Ensure that the vibration table has good performance and can produce stable vibration frequency and amplitude. Check whether the table surface of the vibration table is flat. The vibration frequency is generally adjustable, ranging from 30 to 150Hz, and the amplitude is between 0.5-2mm. Select appropriate vibration parameters based on factors such as the properties of the fluidized solidified soil and the size of the pump pipe.

[0043] Place the pump pipe filled with fluidized solidified soil on the vibration table. The pump pipe should be placed stably to avoid rolling or shifting during vibration. Some fixing devices (such as clamps or brackets) can be used to fix the pump pipe on the vibration table to ensure that the vibration can be effectively transmitted to the pump pipe.

[0044] 2. Parameter setting: Set the vibration frequency and amplitude of the vibration table according to the specific characteristics of the fluidized solidified soil, such as the fluidity of the material, the particle size, etc. If the fluidized solidified soil has good fluidity and small particles, a relatively low frequency and amplitude can be used, such as a frequency of 30-50Hz and an amplitude of 0.5-1mm; if the fluidity of the material is poor or the particles are large, the frequency and amplitude can be appropriately increased, but care must be taken to avoid excessive vibration that may cause damage to the pump pipe or segregation of the solidified soil.

[0045] 3. Vibration process: Turn on the vibration table and let the vibration act on the pump pipe. The vibration time is determined according to the length of the pump pipe, the amount and state of the fluidized solidified soil, and other factors. Generally, the vibration time can be controlled within 30-90 seconds. During the vibration process, observe the state of the fluidized solidified soil in the pump pipe. If obvious bubbles are found on the surface and the flow of the solidified soil in the pump pipe becomes smoother, it can be preliminarily judged that the vibration is effective.

[0046] 4. Effect inspection: After the vibration is completed, the vibration effect can be checked by observing the state of the fluidized solidified soil at the pump pipe outlet. If the solidified soil is uniform, without obvious stratification or agglomeration, and has good fluidity, it means that the vibration has achieved the expected effect. If problems are found, the vibration parameters can be adjusted appropriately and the vibration can be repeated.

[0047] Step 6: After pouring is completed, acceptance inspection is carried out, including surface flatness inspection, crack inspection, flexural strength inspection and density inspection in sequence after pouring is completed.

[0048] Among them, the following are included: 1. Surface flatness inspection (1) Inspection content Height difference measurement: Measure the height difference between different locations on the surface of the solidified soil to evaluate the flatness. Focus on whether there are local bulges or depressions in the large construction area.

[0049] Slope check: For solidified soil surfaces with slope requirements (such as drainage slopes, etc.), check whether the actual slope is consistent with the designed slope.

[0050] (2) Inspection process Tool preparation: Prepare measuring tools such as a ruler (usually 2-3 meters in length), feeler gauge, level, theodolite or total station.

[0051] Preliminary observation: Under natural light, use the naked eye to make a preliminary observation of the surface of the solidified soil to check whether there are obvious uneven areas, such as undulations, potholes, etc.

[0052] Measurement with a ruler: Place the ruler on the surface of the solidified soil, move the ruler in different directions (such as vertical and horizontal directions), and use a feeler gauge to measure the size of the gap between the ruler and the surface where there is a large gap, and record the maximum gap value as the flatness deviation. The allowable deviation of surface flatness is determined according to engineering requirements and specifications.

[0053] Slope measurement: For surfaces with slope requirements, use a level or theodolite (total station) for measurement. Set a certain number of measurement points on the solidified soil surface (determined according to the slope size and accuracy requirements), measure the elevation of each point, and determine the actual slope by calculating the ratio of the elevation difference between adjacent points to the horizontal distance, and compare it with the designed slope.

[0054] 2. Crack inspection (1) Inspection content Crack Width Measurement: Determine the width of cracks to assess their impact on the structural performance of the stabilized soil.

[0055] Record of crack length and direction: record the extension length and direction of cracks on the surface of solidified soil, and analyze the possible causes of crack formation, such as shrinkage, uneven settlement, etc.

[0056] Crack depth detection (optional): If necessary, detect the crack depth to further evaluate the degree of damage to the integrity of the stabilized soil structure.

[0057] (2) Inspection process Tool preparation: Prepare tools such as a magnifying glass, a crack width gauge (with an accuracy of 0.01 - 0.1mm), a tape measure or a steel ruler for measuring length, and an ultrasonic detector (for depth detection).

[0058] Preliminary inspection: Under good lighting conditions, use the naked eye to scan the surface of the solidified soil to look for signs of cracks. For small cracks, a magnifying glass can be used to assist in observation.

[0059] Crack marking: After finding the crack, use chalk or other marking tools to mark the ends and middle of the crack for subsequent measurement and recording.

[0060] Width measurement: Use a crack width measuring instrument to measure at the crack mark, and generally record the width value at the widest part of the crack. In locations where the crack width varies greatly, you can measure several points and record the width at different locations.

[0061] Length and direction record: Use a tape measure or steel ruler to measure the length of the crack from one end to the other. At the same time, observe and record the direction of the crack, such as longitudinal, transverse or diagonal.

[0062] Depth detection (if necessary): When cracks may have a significant impact on structural safety, use equipment such as ultrasonic detectors to detect crack depth. According to the equipment operating instructions, arrange detection points around the cracks and determine the crack depth by analyzing the propagation time and waveform changes of ultrasonic waves in the solidified soil.

[0063] 3. Flexural strength test (1) Test content Failure load: Determine the maximum load value at which the fluidized solidified soil specimen will fail when subjected to bending load. This is the key data for calculating the flexural strength.

[0064] Flexural strength value: The flexural strength of fluidized solidified soil is obtained by calculating factors such as the failure load and specimen size, which is used to evaluate its ability to resist bending failure.

[0065] (2) Testing process Specimen preparation: According to relevant standards or specifications, make fluidized solidified soil prism specimens with a size of 100mm×100mm×400mm. During the preparation process, ensure that the specimen size is accurate, the edges and corners are neat, and when pouring the specimen, ensure that the solidified soil is evenly distributed to avoid pores or local looseness.

[0066] The prepared specimens were cured under standard curing conditions (temperature of 20 ± 2 °C and relative humidity of more than 95%) for 28 days to allow the solidified soil to fully hydrate and harden.

[0067] Instrument preparation: Check the flexural testing machine to ensure that its accuracy meets the requirements and the range can meet the load range required for the test. The loading rate of the testing machine should be accurately controlled, with a loading rate of 0.05 - 0.08MPa / s.

[0068] Apply a small amount of lubricating oil on the support and pressure head of the testing machine to reduce friction during the test.

[0069] Test operation: Take the cured specimen out of the curing room and place it on the support of the flexural testing machine so that the central axis of the specimen coincides with the central axis of the support and the pressure head, with a span of 300 mm.

[0070] Turn on the testing machine and apply concentrated load to the specimen at the set loading rate until the specimen breaks. During the test, record the load value when the specimen breaks.

[0071] Data processing: According to the flexural strength calculation formula: flexural strength = (destructive load × specimen span) ÷ (specimen width × specimen height²), the flexural strength of the fluidized solidified soil specimen is calculated. Among them, the specimen span, width and height have been measured and determined before the test.

[0072] 4. Density detection (1) Test content Dry density determination: Dry density is calculated by measuring the dry mass and volume of fluidized solidified soil. It is an important indicator reflecting the density.

[0073] Relative density (if necessary): For cases with comparative reference, calculate the relative density, that is, the ratio of the measured dry density to the maximum dry density (determined by compaction test, etc.), to more intuitively evaluate the degree of density.

[0074] (2) Testing process Sampling: Use appropriate sampling tools (such as ring cutters or soil drills) to randomly sample in the fluidized solidified soil construction area according to certain rules. For large-scale construction sites, the sampling points should be evenly distributed and representative.

[0075] The sampling depth must meet the engineering requirements and generally penetrate the entire effective layer thickness of the solidified soil.

[0076] Measuring wet density: In the case of sampling with a ring cutter, take out a portion of the solidified soil in the ring cutter, weigh its wet mass (m1) with a balance, and record the data.

[0077] Given the volume of the cutter ring (V), the wet density can be calculated using the wet density formula: wet density (ρ1) = m1÷V.

[0078] Determine the moisture content: Place the remaining solidified soil in the ring cutter in an oven, dry it at 105 - 110°C to constant weight, and weigh the dry mass (m2).

[0079] Calculate the moisture content according to the moisture content formula: moisture content (w) = (m1 - m2) ÷ m2 × 100%.

[0080] Calculate dry density: Calculate dry density according to the dry density formula: dry density (ρ2) = ρ1÷(1 + w). If you need to calculate relative density, you can compare the measured dry density with the maximum dry density determined by compaction test or other methods.

[0081] Example 2 The difference between this embodiment and embodiment 1 is that this embodiment provides a vibration pouring construction system for backfilling fluidized soil without a protective layer, including: a mobile mixing station including a forced mixer for uniformly mixing the raw materials of the filling material into fluidized solidified soil materials, and transporting the fluidized solidified soil materials to the site through transportation equipment; A material quality detection device, including a density detection module and a strength detection module; The pouring device includes a pump pipe and a vibration table, wherein the vibration table is used to vibrate the fluidized solidified soil material in the pump pipe to increase the fluidity of the fluidized solidified soil material and eliminate the pump blocking phenomenon of the fluidized solidified soil material; The acceptance device includes a flatness inspection module, a crack inspection module, a flexural strength inspection module and a density inspection module.

[0082] Specifically, for mobile concrete mixing plants, these include: 1. Feeding system: Aggregate bin: used to store soil materials of different particle sizes, usually with multiple bins, soil materials can be classified and stored. There is a discharge port at the bottom of the bin, and the discharge of soil materials is controlled by a valve; Curing agent bin: stores curing agent, with an independent feeding channel and metering device. The design of the curing agent bin should take into account the characteristics of the curing agent, such as moisture-proof and anti-caking; Water supply system: includes water tank, water pump and pipeline; water tank, used to store water, water pump to transport water to the mixing host, and flow meter is installed on the pipeline to accurately control the water volume.

[0083] 2. Weighing system: Electronic scale: Installed below the discharge port of the aggregate bin, curing agent bin and water supply system. It can accurately weigh the weight of various raw materials to ensure the accuracy of the mix ratio. The electronic scale has a high accuracy of 0.1% - 1%.

[0084] 3. Mixing host Twin-shaft forced mixer: This is a commonly used type of mixing main machine. It has two parallel mixing shafts with mixing blades installed on them. The shape and angle of the mixing blades are reasonably designed. Driven by the mixing shaft, the materials can be strongly stirred to fully mix the soil, curing agent and water.

[0085] Mixing drum: It is the outer shell of the mixer, with wear-resistant lining inside to prevent the drum from being worn during the mixing process. The volume of the mixing drum is determined according to the production scale of the mixing station.

[0086] 4. Conveying system Belt conveyor: used to convey the weighed soil from the aggregate bin to the mixer. The speed of the belt can be adjusted to control the feeding speed.

[0087] Screw conveyor: Mainly used for conveying curing agent, it can accurately control the conveying amount of curing agent and has good sealing performance to prevent curing agent leakage.

[0088] 5. Control system Control cabinet: It is the control center of the mixing station, which is equipped with a programmable logic controller (PLC) and various control appliances. The operator can set mixing parameters such as mix ratio, mixing time, etc. through the operation panel on the control cabinet.

[0089] Sensors: including weight sensors, liquid level sensors and flow sensors, etc. The weight sensor is used to feedback the weight of raw materials, the liquid level sensor monitors the water level in the water tank, and the flow sensor records the flow of water and curing agent. These sensors transmit signals to the PLC to achieve automatic control.

[0090] Working principle: Batching stage: According to the set mix ratio, each part of the feeding system starts working. The valve of the aggregate bin is opened, and the soil is transported to the electronic scale of the weighing system through the belt conveyor for weighing; at the same time, the screw conveyor of the curing agent bin transports the curing agent to the corresponding electronic scale, and the water pump of the water supply system delivers a fixed amount of water according to the signal of the flow meter. When the weight of various raw materials reaches the set value, the feeding stops.

[0091] Mixing stage: The weighed raw materials are fed into the mixing main unit. The twin-shaft forced mixer in the mixing main unit starts working, and the mixing shaft drives the mixing blades to rotate at a certain speed to forcefully mix the soil, curing agent and water. During the mixing process, the materials are pushed by the mixing blades to continuously roll, shear and convect in the mixing drum, so that the curing agent is evenly wrapped on the surface of the soil particles, and the water is fully mixed with the soil and curing agent. The general mixing time is determined according to the properties of the materials and the mixing effect, usually about 3-5 minutes.

[0092] Discharging stage: After the mixing is completed, the discharge door at the bottom of the mixing main unit opens, and the fluidized solidified soil is transported to the transport vehicle or storage container through the discharge port, completing the entire mixing process.

[0093] For transport equipment, this includes: 1. Concrete mixer trucks are composed of chassis, mixing drum, feeding and discharging devices, etc. The mixing drum is its core component, which is pear-shaped or double-conical and is driven to rotate by a drive device installed on the chassis. There are special spiral blades inside the mixing drum, which can stir the materials during the rotation process.

[0094] The mixing drum can rotate in both directions. When rotating in the forward direction, the material can be stirred to prevent the fluidized solidified soil from segregating during transportation; when rotating in the reverse direction, it is used for unloading. The biggest advantage is that the fluidized solidified soil can be continuously stirred during transportation to ensure its uniformity. Especially for long-distance transportation or long transportation time, it can effectively avoid sedimentation and stratification of the solidified soil, ensuring the performance after arriving at the construction site.

[0095] 2. The pipeline transportation system mainly includes pump body, pipeline, valve and other parts. The pump body is the key equipment to provide power, and generally adopts plunger pump or screw pump. The plunger pump has high pressure and can transport over a long distance; the screw pump has little shearing effect on the material and is suitable for transporting fluidized solidified soil with high fluidity requirements.

[0096] Pipes are usually made of steel pipes or high-strength plastic pipes, and their diameters are selected according to the flow requirements, generally between 50-200mm. Pipes are connected by flanges or quick connectors for easy installation and removal. Valves are used to control flow and direction, and there are many types such as gate valves and butterfly valves. Continuous transportation can be achieved, which is particularly suitable for short-distance and efficient transportation of fluidized solidified soil in local areas of construction sites. Pipeline transportation can directly transport solidified soil to the designated pouring location, reducing secondary handling, and is not restricted by terrain and obstacles, such as passing through buildings or underground passages.

[0097] The pumping system includes a hopper: located at the rear of the vehicle, it is a container for receiving the fluidized solidified soil. The hopper is usually funnel-shaped with a large opening to facilitate unloading from equipment such as a mixer truck. There are devices such as grilles inside the hopper to filter out larger impurity particles and prevent them from entering the pumping system.

[0098] The pumping mechanism consists of a main oil cylinder, a concrete cylinder and a piston. The main oil cylinder is driven by a hydraulic system to drive the piston to reciprocate in the concrete cylinder. When the piston moves backward, the fluid solidified soil in the hopper is sucked into the concrete cylinder under the action of gravity and negative pressure; when the piston moves forward, the solidified soil in the concrete cylinder is pressed into the conveying pipeline. The distribution valve is a key component for controlling the flow direction of the solidified soil. It can alternately connect the two concrete cylinders to the conveying pipeline when the piston reciprocates. Common distribution valves include S-tube valves, gate valves, etc. The S-tube valve has the advantages of good sealing and flexible switching, and is widely used in pumping vehicles.

[0099] The hydraulic system provides power support for the pumping system. It mainly includes hydraulic pumps, hydraulic cylinders, hydraulic valves and hydraulic oil tanks. The hydraulic pump converts the mechanical energy of the engine into hydraulic energy, controls the extension and retraction of the hydraulic cylinder through the hydraulic valve, and drives the pumping mechanism to work. The hydraulic system can automatically adjust the pressure and flow according to the pumping resistance and other conditions to ensure the stable operation of the pumping operation.

[0100] The boom system is used to extend the pump pipe to a farther location for pouring. The boom is generally composed of multiple segments, and its extension, folding and rotation can be controlled by hydraulic cylinders. The length of the boom varies according to the vehicle model and engineering requirements. Some booms can be extended to tens of meters, able to cross obstacles and accurately transport the fluidized solidified soil to the designated location.

[0101] Pump pipes are generally made of metal (such as steel pipes) or high-strength wear-resistant plastics. Steel pipes have high strength and pressure resistance and can withstand high pressure during pumping; wear-resistant plastic pump pipes are light in weight, easy to install, and have low friction resistance to solidified soil. The diameter of the pump pipe is selected based on factors such as the pumping flow rate and the characteristics of the solidified soil, and is generally around 100-150mm. The pump pipes are connected by various connecting parts, the most common of which are flange connections and quick connector connections. The flange connection has good sealing and firm connection, and is suitable for long-term fixed pumping systems; the quick connector connection is convenient and fast, which facilitates the installation and removal of the pump pipe, especially in situations where the pump pipe needs to be frequently moved or replaced.

[0102] When the pump truck starts working, the fluidized solidified soil is poured into the hopper. The hydraulic system drives the main oil cylinder of the pumping mechanism, causing the piston to reciprocate in the concrete cylinder. When the piston retreats, the solidified soil in the hopper is sucked into the concrete cylinder; when the piston moves forward, the solidified soil in the concrete cylinder is pressed into the pump pipe through the distribution valve. Under the continuous action of the hydraulic system, the solidified soil is continuously pushed forward in the pump pipe. Under the action of pressure, the solidified soil in the pump pipe flows along the pipeline and is finally transported to the pouring position through the outlet at the end. If there is a boom system, the position and angle of the boom can also be adjusted to accurately transport the solidified soil to a farther or higher position for pouring.

[0103] For ultra-long distance pouring greater than 100 meters, high-strength, wear-resistant pump pipes should be selected. Generally speaking, steel pipes are strong and can withstand high pressures, but they are heavy; high-strength wear-resistant plastic pump pipes are light and easy to install, but their pressure resistance is relatively low. Taking all factors into consideration, composite pump pipes with an inner layer of wear-resistant plastic and an outer layer of metal reinforcement can be used. The diameter of the pump pipe should be selected according to the pumping volume and the characteristics of the fluidized solidified soil, usually between 100-150mm to ensure sufficient flow and low resistance.

[0104] Vibration table Choose a vibration table with appropriate frequency and amplitude. The vibration frequency is generally between 30-150Hz, and the amplitude is between 0.5-2mm. Too high a frequency may cause segregation of the solidified soil, while too low a frequency will not effectively improve fluidity. Determine the best combination of vibration frequency and amplitude through experiments based on factors such as the length and diameter of the pump pipe and the properties of the fluidized solidified soil. Install the vibration table at key locations on the pump pipe, such as installing one at a certain distance (such as 10-15 meters) to ensure that the vibration can be evenly transmitted to the entire pump pipe.

[0105] During the pumping process, adjust the parameters of the vibration table in time according to the flow of the fluidized solidified soil in the pump pipe. If the fluidity of the solidified soil is found to be poor, the vibration frequency or amplitude can be appropriately increased, but care should be taken to avoid excessive vibration that may cause segregation of the solidified soil.

[0106] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A vibration pouring construction method for backfilling fluidized soil without a protective layer, characterized in that: include: Preparation of fluidized solidified soil materials; Conduct quality inspection on the prepared fluidized solidified soil materials; Use the fluidized solidified soil materials that have passed the quality inspection to cast the construction site in layers; Acceptance inspection is carried out after pouring is completed.

2. The vibration pouring construction method of backfilling fluidized soil without protective layer according to claim 1 is characterized in that: The preparation of the fluidized solidified soil material includes supplying filling materials through a mobile mixing station, wherein the filling materials include cement, a curing agent, plain soil and water for the mixture; wherein the filling materials are mixed with a forced mixer, and the output of the mixer is adjusted according to the construction progress.

3. The vibration pouring construction method of backfilling fluidized soil without protective layer according to claim 2 is characterized in that: The preparation of the fluidized solidified soil material also includes the ratio of the base soil, the curing agent and the mixing water being 0.74:0.2:0.06; wherein cement and base soil are first added to the mixer, and then 3 / 4 of the mixing water is added, and after stirring for 20 seconds, the curing agent and the remaining mixing water are added.

4. The vibration pouring construction method of backfilling fluidized soil without protective layer according to claim 3 is characterized in that: The quality inspection of the prepared fluidized solidified soil material includes density inspection and strength inspection of the fluidized solidified soil material, and at the same time, inspection of the flow expansion, wet bulk density, strength, setting time, permeability coefficient, water stability coefficient and volume water absorption rate of the fluidized solidified soil material.

5. The vibration pouring construction method of backfilling fluidized soil without protective layer according to claim 4 is characterized in that: The strength test includes making a prism specimen with a size of 100mm×100mm×400mm from the fluidized solidified soil material, curing the specimen in a standard curing room, and after the curing is completed, performing a pressure test using a pressure testing machine, and recording the maximum pressure when the specimen is destroyed.

6. The vibration pouring construction method of backfilling fluidized soil without protective layer according to claim 5 is characterized in that: The method of using fluidized solidified soil materials that have passed quality inspection to pour the construction site in layers includes cleaning the base of the construction site and pouring in layers according to design requirements and site conditions. After the top layer of the fill body is poured, the surface of the fill body is immediately covered with plastic film or geotextile for moisture retention and maintenance. Among them, the foundation trench backfill is poured in sections, and the fluidized solidified soil is poured in layers and blocks.

7. A vibration pouring construction method for backfilling fluidized soil without a protective layer according to claim 6, characterized in that: The layered pouring of the fluidized solidified soil material that has passed the quality inspection also includes, during the pouring process, using a vibration table to vibrate the fluidized solidified soil material in the pump pipe to increase the fluidity of the fluidized solidified soil material and eliminate the pump blocking phenomenon of the fluidized solidified soil material.

8. The vibration pouring construction method of backfilling fluidized soil without protective layer according to claim 7 is characterized in that: The acceptance inspection is carried out after the pouring is completed, including surface flatness inspection, crack inspection, flexural strength inspection and density inspection in sequence after the pouring is completed.

9. A vibration pouring construction method for backfilling fluidized soil without a protective layer according to claim 8, characterized in that: The density test includes using a sampling tool to randomly sample in the fluidized solidified soil construction area according to certain rules, calculating the wet density of the sample according to the wet density formula, then measuring the dry density by drying the sample, and calculating the relative density based on the dry density and wet density.

10. A vibrating pouring construction system for backfilling fluidized soil without a protective layer, characterized in that: include: Mobile mixing station, including forced mixer, is used to mix the filling material raw materials evenly into fluidized solidified soil materials, and transport the fluidized solidified soil materials to the site through transportation equipment; A material quality detection device, including a density detection module and a strength detection module; The pouring device includes a pump pipe and a vibration table, wherein the vibration table is used to vibrate the fluidized solidified soil material in the pump pipe to increase the fluidity of the fluidized solidified soil material and eliminate the pump blocking phenomenon of the fluidized solidified soil material; The acceptance device includes a flatness inspection module, a crack inspection module, a flexural strength inspection module and a density inspection module.

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