In-situ solidification construction method for shallow soft soil

Abstract

The present invention relates to the technical field of foundation reinforcement, and specifically discloses a shallow soft soil in-situ solidification construction method, comprising the following steps: S1, dividing a number of treatment areas according to the area of ​​the construction site; S2, leveling the ground of the treatment area; S3, laying a sand cushion layer; S4, determining the position of plastic drain boards, and vertically burying a number of plastic drain boards using a plate inserting machine; S5, laying a main pipeline and branch pipelines, connecting the branch pipelines to the plastic drain boards, and connecting the main pipeline to the branch pipelines; S6, connecting the main pipeline to a vacuum pump, starting the vacuum pump to test the sealing of the main pipeline and the branch pipelines; S7, laying a sealing film on the sand cushion layer; S8, gradually starting the vacuum pumps, first starting some vacuum pumps at a pumping rate of 40%, running for a preset number of days, then starting some vacuum pumps at a pumping rate of 80%, running for a preset number of days, and finally starting the remaining vacuum pumps at a pumping rate of 100%, running the vacuum pumps until the planned running time. The technical solution of the present invention can reduce costs and achieve good reinforcement effects.

Description

Technical Field

[0001] The invention relates to the technical field of foundation reinforcement, in particular to a shallow soft soil in-situ solidification construction method. Background Art

[0002] Soft soil refers to fine-grained soil deposited in coastal areas, lakes, valleys, and riverbanks, with high natural water content, a large porosity, high compressibility, and low shear strength. It is characterized by high natural water content, a large natural porosity, high compressibility, low shear strength, a small consolidation coefficient, a long consolidation time, high sensitivity, high disturbance resistance, poor permeability, complex layered distribution, and significant differences in physical and mechanical properties between layers.

[0003] When constructing roads, railways, ports and other buildings, soft soil foundations must be treated. The purpose of soft soil foundation treatment is to strengthen the load-bearing layer under the foundation of the building or equipment to improve its strength and stability, so as to improve or reinforce the natural state of the foundation, ensure the stability requirements of the foundation when bearing load and ensure that the foundation deformation does not exceed the allowable value specified in the specifications.

[0004] Traditional foundation treatment methods often use cement as a solidifying material and reinforce semi-rigid or flexible pile foundations through deep mixing, rotary spraying or powder spraying to improve or strengthen the natural state of the foundation. However, this method is costly and has limited effect on improving the soft soil of the riverbed.

[0005] Therefore, a shallow soft soil in-situ solidification construction method with low cost and good reinforcement effect is needed. Summary of the Invention

[0006] The present invention provides a shallow soft soil in-situ solidification construction method, which can reduce costs and has a good reinforcement effect.

[0007] In order to solve the above technical problems, this application provides the following technical solutions:

[0008] The shallow soft soil in-situ solidification construction method includes the following steps:

[0009] S1. Divide the construction site into several treatment areas according to its area;

[0010] S2. Level the ground in the treatment area;

[0011] S3. Lay a sand cushion layer on the ground;

[0012] S4. Determine the position of the plastic drain board and vertically bury several plastic drain boards using a board inserting machine;

[0013] S5. Lay the main pipeline and branch pipelines, connect the branch pipelines with the plastic drainage board, and connect the main pipeline with the branch pipeline;

[0014] S6. Connect the main pipeline to the vacuum pump, start the vacuum pump to test the sealing of the main pipeline and the branch pipeline, and check whether there is any air leakage or leaking point. If the sealing test is passed, turn off the vacuum pump;

[0015] S7. Lay a sealing film on the sand cushion layer, dig a sealing trench at the edge of the treatment area, and bury the edge of the sealing film in the sealing trench;

[0016] S8. Start the vacuum pumps gradually. First, start some of the vacuum pumps at a 40% pump-on rate and run them for a preset number of days. Then, start some of the vacuum pumps at an 80% pump-on rate and run them for a preset number of days. Finally, start the remaining vacuum pumps at a 100% pump-on rate and run the vacuum pumps for the planned operating time.

[0017] The basic scheme principles and beneficial effects are as follows:

[0018] In this solution, a vacuum pump generates negative pressure, forcing water from the soft soil to drain through the plastic drainage panels. This reduces the soil's moisture content, increases soil strength, and ensures that the treated soft soil meets foundation bearing capacity requirements. Using a vacuum pump to generate negative pressure is cost-effective. By gradually increasing the pump's activation rate, this solution effectively prevents soil particles within the soft soil from forming soil pillars due to short-term exposure to high vacuum pressure, thereby improving drainage effectiveness.

[0019] Furthermore, in step S8, when the pump opening rate is 40% and 80%, the vacuum degree is not less than 40 kPa, and when the pump opening rate is 100%, the vacuum degree is not less than 80 kPa.

[0020] When the pump opening rate does not reach 100%, reducing the vacuum degree can also effectively prevent the soil particles inside the soft soil from forming soil columns.

[0021] Furthermore, the step S8 includes:

[0022] S801. Install a temperature sensor on the vacuum pump;

[0023] S802, starting some vacuum pumps at a pumping rate of 40% and running them for a preset number of days;

[0024] S803, receiving temperature data of the activated vacuum pump collected by each temperature sensor through the control terminal;

[0025] S804, calculating an average value based on the maximum value of the temperature data of each vacuum pump, and marking the vacuum pumps whose maximum value of the temperature data is lower than the average value;

[0026] S805: After the preset number of days of operation, determine whether the number of marked vacuum pumps is greater than 1 / 2 of the number of open vacuum pumps. If so, close 1 / 2 of the open vacuum pumps in descending order of maximum value. If less than or equal to the maximum value, close all vacuum pumps whose maximum temperature data is lower than the average value.

[0027] S806: Start the remaining vacuum pumps until the pump start rate reaches 80% and the number of days is preset; calculate the average temperature data of each vacuum pump in operation, and filter out abnormal values ​​from the average values ​​of all the started vacuum pumps;

[0028] S807 , starting the remaining vacuum pumps at a 100% pumping rate, and setting the data return frequency of the temperature sensor corresponding to each vacuum pump, wherein the return frequency of the abnormal vacuum pump is higher than the return frequencies of the other vacuum pumps.

[0029] In this preferred solution, by setting a temperature sensor on the vacuum pump, the operating status of the vacuum pump can be detected to avoid overheating. After starting some vacuum pumps at a 40% pump-on rate, 1 / 2 of the vacuum pumps that are turned on are shut down in descending order of maximum value, or all vacuum pumps whose maximum temperature data is lower than the average value are shut down; the vacuum pumps with lower temperatures are cycled, while the vacuum pumps with higher temperatures continue to be tested. After reaching an 80% pump-on rate, the average temperature data of each operating vacuum pump is calculated, and abnormal values ​​are screened out from the average values ​​of all started vacuum pumps; vacuum pumps with abnormal temperatures can be screened out, and the feedback frequency of the abnormal vacuum pump is set to be higher than the feedback frequency of other vacuum pumps. When the abnormal vacuum pump has an overly high temperature, it can be discovered immediately.

[0030] Furthermore, the method also includes step S808, wherein the control terminal determines whether the temperature exceeds a first temperature threshold according to the temperature data, and generates an alarm message if the temperature exceeds the first temperature threshold.

[0031] Remind relevant staff to deal with it in a timely manner.

[0032] Furthermore, in step S808, the control terminal also determines whether the second temperature threshold is exceeded based on the temperature data. If the second temperature threshold is exceeded, the corresponding vacuum pump is turned off, wherein the second temperature threshold is greater than the first temperature threshold.

[0033] If the second temperature threshold is exceeded, there is a risk of damaging the vacuum pump, so it is shut down first.

[0034] Furthermore, in step S806, the number of abnormal values ​​should be less than 5% of the total number, and the vacuum pumps corresponding to the abnormal values ​​are marked as abnormal vacuum pumps.

[0035] Furthermore, in S806, when the pump start rate reaches 80% and the preset number of days of operation reaches 1 / 2, it is determined whether there are any vacuum pumps that have not been started. If so, the number of vacuum pumps that have not been started is calculated, and the vacuum pumps that have been started are sorted from low to high according to the maximum value of the temperature data. The corresponding number of vacuum pumps that have been started are closed in order from low to high, and the vacuum pumps that have not been started are started.

[0036] Ensure that each vacuum pump is tested at 100% pumping rate and 80kPa full power before operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 The figure is a flow chart of the shallow soft soil in-situ solidification construction method according to Example 1. DETAILED DESCRIPTION

[0038] The following is further described in detail through specific implementation methods:

[0039] Example 1

[0040] like Figure 1 As shown, the shallow soft soil in-situ solidification construction method of this embodiment includes the following steps:

[0041] S1. Divide the construction site into several treatment areas according to its area;

[0042] S2. Level the ground in the treatment area. Specifically, clear the ground of plants and debris, and then level the ground after cleaning.

[0043] S3. Lay a sand cushion layer on the ground;

[0044] S4. Determine the position of the plastic drain board and vertically bury several plastic drain boards through a board inserting machine. The core board of the plastic drain board can be made of polypropylene, and the filter membrane can be made of polyester compound.

[0045] S5. Lay the main pipeline and branch pipelines, connect the branch pipelines to the plastic drain board, and connect the main pipeline to the branch pipeline. Specifically, the branch pipeline is connected to the plastic drain board through a butterfly joint, and the main pipeline is connected to the branch pipeline through a tee joint; the spacing between adjacent branch pipelines is 2-3 meters, which is 2 meters in this embodiment.

[0046] S6. Connect the main pipeline to a vacuum pump, start the vacuum pump to test the sealing of the main pipeline and the branch pipeline, and check whether there is any air leakage or air leak. If the sealing test is passed, turn off the vacuum pump. In this embodiment, a vacuum pump is arranged every 800-1100 square meters, and a jet vacuum pump is specifically used.

[0047] S7. Lay a sealing film on the sand cushion layer, dig a sealing trench at the edge of the treatment area, and bury the edge of the sealing film in the sealing trench;

[0048] S8. Start the vacuum pumps gradually, first starting some of the vacuum pumps at a 40% operating rate for a preset number of days, then starting some of the vacuum pumps at an 80% operating rate for a preset number of days, and finally starting the remaining vacuum pumps at a 100% operating rate, running the vacuum pumps for the planned operating time. At the 40% and 80% operating rates, the vacuum degree under the sealing membrane is maintained at no less than 40 kPa, and at the 100% operating rate, the vacuum degree under the sealing membrane is maintained at no less than 80 kPa.

[0049] Specifically include:

[0050] S801, setting a temperature sensor on the vacuum pump to collect temperature data of the vacuum pump;

[0051] S802, starting some vacuum pumps at a pumping rate of 40% and running them for a preset number of days;

[0052] S803, receiving temperature data of the activated vacuum pump collected by each temperature sensor through the control terminal;

[0053] S804, calculating an average value based on the maximum value of the temperature data of each vacuum pump, and marking the vacuum pumps whose maximum value of the temperature data is lower than the average value;

[0054] S805. After running for the preset number of days, determine whether the number of marked vacuum pumps is greater than 1 / 2 of the number of opened vacuum pumps. If it is greater, close 1 / 2 of the opened vacuum pumps in descending order of maximum value. If it is less than or equal to, close all vacuum pumps whose maximum temperature data is lower than the average value. The preset number of days is 1-2 days, which is 2 days in this embodiment.

[0055] S806. Start the remaining vacuum pumps until the pump activation rate reaches 80%. When the preset number of days has been reached, determine whether there are any vacuum pumps that have not been activated. If so, calculate the number of vacuum pumps that have not been activated. Sort the activated vacuum pumps from low to high according to the maximum value of the temperature data. Close the corresponding number of activated vacuum pumps in order from low to high, and start the vacuum pumps that have not been activated. When the preset number of days has been reached, calculate the average temperature data of each operating vacuum pump and filter out abnormal values ​​from the average values ​​of all activated vacuum pumps. The number of abnormal values ​​should be less than 5% of the total number. The vacuum pumps corresponding to the abnormal values ​​are marked as abnormal vacuum pumps. In this embodiment, Tukey's Test method is used to filter out abnormal values.

[0056] S807 , starting the remaining vacuum pumps at a 100% pumping rate, and setting the data return frequency of the temperature sensor corresponding to each vacuum pump, wherein the return frequency of the abnormal vacuum pump is higher than the return frequencies of the other vacuum pumps.

[0057] S808. The control terminal determines whether the temperature exceeds the first temperature threshold based on the temperature data. If the temperature exceeds the first temperature threshold, an alarm message is generated. The control terminal also determines whether the temperature exceeds the second temperature threshold based on the temperature data. If the temperature exceeds the second temperature threshold, the corresponding vacuum pump is turned off, wherein the second temperature threshold is greater than the first temperature threshold.

[0058] S9. Check whether the soil consolidation degree meets the construction requirements. If not, continue to start all vacuum pumps at 100% pumping rate, increase the running time, for example, increase by 5 days each time, and then conduct tests until the construction requirements are met.

[0059] Example 2

[0060] This embodiment differs from the first embodiment in that it further includes step S10, which records the total operating time required for each treatment zone to meet the construction requirements, calculates the average of the total operating time, and transmits the average of the total operating time as a recommended preset number of days to the control terminal. By calculating the average of the total operating time and transmitting it to the control terminal, relevant management personnel can use it as a reference to set a more reasonable preset number of days during the next curing construction, thereby reducing repeated testing and improving construction efficiency.

[0061] The above are only embodiments of the present invention. The invention is not limited to the fields involved in this implementation case. Common knowledge such as the known specific structures and characteristics in the scheme is not described in detail here. Ordinary technicians in the relevant field are aware of all common technical knowledge in the technical field to which the invention belongs before the application date or priority date, can obtain all existing technologies in the field, and have the ability to apply conventional experimental means before that date. Ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the inspiration given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several variations and improvements can be made, which should also be regarded as the scope of protection of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A shallow soft soil in-situ solidification construction method, characterized in that: The steps include: S1. Divide the construction site into several treatment areas according to its area; S2. Level the ground in the treatment area; S3. Lay a sand cushion layer on the ground; S4. Determine the position of the plastic drain board and vertically bury several plastic drain boards using a board inserting machine; S5. Lay the main pipeline and branch pipelines, connect the branch pipelines with the plastic drainage board, and connect the main pipeline with the branch pipeline; S6. Connect the main pipeline to the vacuum pump, start the vacuum pump to test the sealing of the main pipeline and the branch pipeline, and check whether there is any air leakage or leaking point. If the sealing test is passed, turn off the vacuum pump; S7. Lay a sealing film on the sand cushion layer, dig a sealing trench at the edge of the treatment area, and bury the edge of the sealing film in the sealing trench; S8, gradually starting the vacuum pumps, first starting some of the vacuum pumps at a 40% pumping rate, running them for a preset number of days, then starting some of the vacuum pumps at an 80% pumping rate, running them for a preset number of days, and finally starting the remaining vacuum pumps at a 100% pumping rate, running the vacuum pumps for the planned running time; When the pump is on at a rate of 40% or 80%, the vacuum degree shall be no less than 40 kPa; when the pump is on at a rate of 100%, the vacuum degree shall be no less than 80 kPa; specifically, S801. Install a temperature sensor on the vacuum pump; S802: Start some vacuum pumps at a pumping rate of 40% and run them for a preset number of days; S803, receiving temperature data of the activated vacuum pump collected by each temperature sensor through the control terminal; S804, calculating an average value based on the maximum value of the temperature data of each vacuum pump, and marking the vacuum pumps whose maximum value of the temperature data is lower than the average value; S805: After the preset number of days of operation, determine whether the number of marked vacuum pumps is greater than 1 / 2 of the number of open vacuum pumps. If so, close 1 / 2 of the open vacuum pumps in descending order of maximum value. If less than or equal to the maximum value, close all vacuum pumps whose maximum temperature data is lower than the average value. S806: Start the remaining vacuum pumps until the pump start rate reaches 80% and the number of days is set. Calculate the average temperature data of each running vacuum pump and filter out abnormal values ​​from the average values ​​of all started vacuum pumps. S807: Start the remaining vacuum pumps at a 100% pumping rate, and set the data return frequency of the temperature sensor corresponding to each vacuum pump, wherein the return frequency of the abnormal vacuum pump is greater than the return frequency of the other vacuum pumps.

2. The shallow soft soil in-situ solidification construction method according to claim 1, characterized in that: The process also includes step S808, wherein the control terminal determines whether the temperature exceeds a first temperature threshold according to the temperature data, and generates an alarm message if the temperature exceeds the first temperature threshold.

3. The shallow soft soil in-situ solidification construction method according to claim 2, characterized in that: In step S808, the control terminal further determines whether the temperature exceeds a second temperature threshold based on the temperature data. If the temperature exceeds the second temperature threshold, the corresponding vacuum pump is turned off, wherein the second temperature threshold is greater than the first temperature threshold.

4. The shallow soft soil in-situ solidification construction method according to claim 3 is characterized in that: In step S806, the number of abnormal values ​​should be less than 5% of the total number, and the vacuum pumps corresponding to the abnormal values ​​are marked as abnormal vacuum pumps.

5. The shallow soft soil in-situ solidification construction method according to claim 4 is characterized in that: In the above S806, when the pump start rate reaches 80% and the preset number of days of operation reaches 1 / 2, it is determined whether there is a vacuum pump that has not been started. If so, the number of vacuum pumps that have not been started is calculated, and the vacuum pumps that have been started are sorted from low to high according to the maximum value of the temperature data. The corresponding number of vacuum pumps that have been started are closed in order from low to high, and the vacuum pumps that have not been started are started.

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