Horizontal pressure applying system and combined soft foundation treatment method

Abstract

The invention discloses a horizontal pressure applying system and a combined soft foundation treatment method, and belongs to the technical field of civil engineering. The horizontal pressure applying system comprises a plastic hard pipe, a drainage plate, a rubber hose, a rubber hose sealing bottom, a pressurizing branch pipe, a pressurizing main pipe, an air compressor, a sand filtering groove, a vacuumizing branch pipe, a vacuumizing main pipe, a vacuumizing machine, a plastic diaphragm, a low soil weir and air-closed pressing soil; one end of the rubber hose is communicated with the plastic hard pipe and is fixedly arranged with the plastic hard pipe, the other end of the rubber hose is fixedly provided with the rubber hose sealing bottom, the drainage plate is fixedly adhered to the outer side of the rubber hose, the pressurizing branch pipe is communicated with the plastic hard pipe and is fixedly arranged, and the pressurizing main pipe is communicated with the pressurizing branch pipe and is fixedly arranged. According to the horizontal pressure applying system and the combined soft foundation treatment method, in the soft foundation treatment process, bidirectional pressure applying can be achieved, the pressure applying speed can be increased, the foundation treatment effect is good, and the consumed time is short.

Description

Technical Field

[0001] This invention belongs to the field of civil engineering technology, specifically a horizontal pressure system and a combined soft soil foundation treatment method. Background Technology

[0002] Soft soil has low bearing capacity and low shear strength. Constructing buildings or structures on soft foundations often leads to foundation strength loss and extrusion failure. Soft soil also has very high compressibility and large settlement deformation, frequently causing building deformation or cracking due to foundation settlement. Soft soil can even lead to the destruction of buildings or structures, thus requiring treatment. Currently, the most common and economical treatment methods are surcharge preloading and vacuum preloading. To shorten preloading time, drainage boards or sandbags are usually inserted into the soft soil. These methods are widely used in soft soil foundation treatment and have achieved good results. However, all foundation treatment methods currently used in engineering, including surcharge preloading and vacuum preloading, have the following shortcomings: First, these methods only apply vertical pressure to the soft soil, resulting in poor treatment effect and long treatment time. Second, the loading rate of surcharge preloading is limited. If the loading rate is too fast, the soft soil's bearing capacity will be insufficient, causing foundation failure, thus also leading to excessively long treatment time. Although vacuum preloading is not affected by the loading rate and will not cause foundation failure, the vertical pressure applied to soft soil by vacuum preloading is limited. Theoretically, the maximum value is only 100 kPa, but in engineering practice, due to various factors such as machinery, the vertical pressure applied to soft soil is only about 80 kPa. Summary of the Invention

[0003] To address the aforementioned problems in the existing technology, the present invention provides a technical solution for a horizontal pressure system and a combined soft soil treatment method.

[0004] The horizontal pressure application system is characterized by comprising a plastic rigid pipe, a drainage board, a rubber hose, a rubber hose bottom seal, a concrete root pile, a pressure branch pipe, a pressure main pipe, an air compressor, a filter sand tank, a vacuum branch pipe, a vacuum main pipe, a vacuum machine, a plastic diaphragm, a low soil embankment, and airtight compacted soil. The rubber hose is characterized by having one end connected to and fixedly installed with the plastic rigid pipe, and the other end fixedly fitted with a rubber hose bottom seal. The drainage board is fixedly adhered to the outside of the rubber hose, with a cross-sectional dimension of 15cm width and 1cm thickness. When the rubber hose is not inflated, its wall is flush, with a rectangular cross-section and a width of 16cm. The pressure branch pipe is connected to and fixedly installed with the plastic rigid pipe, the pressure main pipe is connected to and fixedly installed with the pressure branch pipe, and the pressure main pipe is connected to and fixedly installed with the air compressor.

[0005] The horizontal pressure application system is characterized in that the concrete root pile is formed by pouring concrete into an expanded rubber hose after the soft soil foundation treatment is completed. The horizontal pressure application system is characterized in that: the filter sand trough is 40cm wide, 30cm deep, and its length is consistent with the length of the soft soil to be treated; the vacuum branch pipe has small holes at 10cm intervals, with a hole diameter of 1cm, and the vacuum branch pipe is connected to and fixedly installed with the vacuum main pipe, and the vacuum main pipe is connected to and fixedly installed with the vacuum machine; a low soil embankment is piled around the soft soil to be treated; a plastic diaphragm is laid on the soft soil to be treated, and after crossing the low soil embankment, it is compacted by air-tight compaction soil.

[0006] The method for treating soft soil foundations using a horizontal pressure system is characterized by the following steps: 1) Prepare the site, remove weeds, silt, etc. within the soft soil area to be treated, and make the site level; 2) Mark the locations of the drainage boards with lime. The drainage boards should be arranged in a square with a center-to-center distance of 1.2m. 3) Use machinery or manual labor to insert the drainage board, rubber hose, and rubber hose seal into the soft soil to the design depth. Inserting drainage boards is a mature technology in engineering. The length of the drainage board is determined by the designer based on the geological conditions and building load. The top of the plastic rigid pipe is flush with the ground and the top of the plastic rigid pipe is sealed with a plastic plug. 4) After all the drainage boards, rubber hoses, and rubber hose seals are installed within the soft soil area to be treated, remove the plastic plugs that are blocking the top of the plastic rigid pipes. 5) Connect and fix the pressurized branch pipe to the plastic rigid pipe, connect and fix the pressurized main pipe to the pressurized branch pipe, and connect and fix the pressurized main pipe to the air compressor. 6) Excavate a filter sand trench along the direction of the pressurized branch pipe, with the drainage board as the center; 7) Fill the filter sand tank with fine sand; 8) Lay the vacuum branch pipe on the filter sand tank, connect the vacuum branch pipe to the vacuum main pipe and fix it in place, and connect the vacuum main pipe to the vacuum machine and fix it in place. 9) Construct a low earthen embankment around the area of ​​soft soil foundation that needs to be treated; 10) Lay a plastic diaphragm on the soft soil foundation that needs to be treated. After the plastic diaphragm crosses the low soil embankment, it is compacted by air-tight compacted soil. 11) Pour water over the plastic diaphragm to a depth of 10cm; 12) Turn on the vacuum pump to create a vacuum under the plastic diaphragm. When the vacuum under the plastic diaphragm reaches -75 kPa, i.e., the soft soil surface is subjected to a vertical pressure of 75 kPa, turn on the air compressor. After the high-pressure gas enters the rubber hose, the rubber hose expands radially outward, and the soft soil foundation is subjected to horizontal pressure. The air compressor pressure is maintained at 70% of the pressure of the pre-constructed building foundation. After seven days, the air compressor pressure is increased to 120% of the pressure of the pre-constructed building foundation. Because of the vertical pre-compression pressure and the vertical self-weight stress, the appropriate increase in horizontal stress will not cause foundation damage. 13) After the ground settlement reaches the design requirements, the ground settlement required by the design shall be determined by the designer based on the geological conditions and building load conditions. Then, shut down the vacuum pump and start the air compressor, remove the water accumulated on the plastic diaphragm, and remove the plastic diaphragm, pressurizing branch pipe and pressurizing main pipe, vacuum branch pipe and vacuum main pipe. 14) Concrete is poured into the expanded rubber hose through the top of the plastic rigid pipe. Due to the complex soil conditions, the shape of the expanded rubber hose will vary, and the concrete piles formed in the rubber hose will also be uneven. These root piles formed throughout the treatment area can increase the bearing capacity of the foundation and the overall stability. 16) Seven days later, the construction site was cleaned up and the joint soft soil treatment was completed.

[0007] This invention provides a horizontal pressure application system and a combined soft soil foundation treatment method. Its advantages are: during the soft soil foundation treatment process, both vertical and horizontal pressures are applied simultaneously. Because the horizontal self-weight stress of the soil layer is much smaller than its vertical self-weight stress, the applied horizontal pressure more easily compacts the soil layer. This invention's technical solution achieves both bidirectional pressure application and increases the rate of pressure application, resulting in good foundation treatment effect and short treatment time. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the horizontal pressure application system of the present invention; Figure 2 This is a schematic diagram of the connection structure of the drainage board, plastic rigid pipe, and rubber flexible hose of the present invention; Figure 3 This is a schematic cross-sectional view of the drainage board and rubber hose of the present invention when they are not inflated; Figure 4 This is a schematic diagram of the cross-section of the drainage board and the rubber hose after the rubber hose of the present invention has expanded; Figure 5 This is a schematic diagram of the longitudinal section of the concrete tree root pile of the present invention; Figure 6 This is a schematic diagram of the vacuum system structure of the present invention; Figure 7 This is a schematic diagram of the combined soft foundation processing system of the present invention; Figure 8 This is a schematic cross-sectional view of the combined soft foundation treatment system of the present invention; Figure 9 This is a schematic diagram of the soft foundation subjected to bidirectional forces according to the present invention. Detailed Implementation

[0009] The present invention will be further described below with reference to the accompanying drawings.

[0010] As shown in the figure, a horizontal pressure system consists of a plastic rigid pipe 1, a drainage board 2, a rubber hose 3, a rubber hose bottom seal 4, a concrete root pile 5, a pressure branch pipe 6, a pressure main pipe 7, an air compressor 8, a filter sand tank 9, a vacuum branch pipe 10, a vacuum main pipe 11, a vacuum machine 12, a plastic diaphragm 13, a low soil weir 14, and airtight compacted soil 15. One end of the rubber hose 3 is connected to and fixedly installed with the plastic rigid pipe 1, and the other end of the rubber hose 3 is fixedly installed with the rubber hose bottom seal 4. The drainage board 2 is fixedly adhered to the outside of the rubber hose 3. The cross-sectional dimensions of the drainage board 2 are 15cm wide and 1cm thick. When the rubber hose 3 is not inflated, the pipe wall is flat, the cross-section is rectangular, and the width is 16cm. The pressure branch pipe 6 is connected to and fixedly installed with the plastic rigid pipe 1, the pressure main pipe 7 is connected to and fixedly installed with the pressure branch pipe 6, and the pressure main pipe 7 is connected to and fixedly installed with the air compressor 8.

[0011] The concrete root pile 5 is formed by pouring concrete into the expanded rubber hose 3 after the soft soil foundation treatment is completed.

[0012] The filter sand tank 9 is 40cm wide, 30cm deep, and its length is the same as the length of the soft soil to be treated; the vacuum branch pipe 10 has small holes at 10cm intervals, with a hole diameter of 1cm. The vacuum branch pipe 10 is connected to and fixedly installed with the vacuum main pipe 11. The vacuum main pipe 11 is connected to and fixedly installed with the vacuum machine 12; the low soil embankment 14 is piled up around the soft soil to be treated; the plastic diaphragm 13 is laid on the soft soil to be treated, and after crossing the low soil embankment 14, it is compacted by the airtight compaction soil 15.

[0013] The method for treating soft soil foundations using a horizontal pressure system includes the following steps: 1) Prepare the site, remove weeds, silt, etc. within the soft soil area to be treated, and make the site level; 2) Mark the location of drainage board 2 with lime. Drainage board 2 is arranged in a square with a center-to-center distance of 1.2m. 3) Use machinery or manual labor to insert the drainage board 2, rubber hose 3, and rubber hose bottom seal 4 into the soft soil to the design depth. The top of the plastic rigid pipe 1 should be flush with the ground. Seal the top of the plastic rigid pipe 1 with a plastic plug. 4) After all the drainage boards 2, rubber hoses 3, and rubber hose bottom seals 4 in the soft soil area that needs to be treated are inserted, remove the plastic plug that is sealing the top of the plastic rigid pipe 1. 5) Connect and fix the pressurized branch pipe 6 to the plastic rigid pipe 1, connect and fix the pressurized main pipe 7 to the pressurized branch pipe 6, and connect and fix the pressurized main pipe 7 to the air compressor 8. 6) Excavate a filter sand trench 9 along the direction of the pressurized branch pipe 6, with the drainage board 2 as the center; 7) Fill the filter sand tank 9 with fine sand; 8) Lay the vacuum branch pipe 10 on the filter sand tank 9, connect the vacuum branch pipe 10 to the vacuum main pipe 11 and fix it, and connect the vacuum main pipe 11 to the vacuum machine 12 and fix it. 9) Construct a low earthen embankment 14 around the area of ​​the soft soil foundation that needs to be treated; 10) Lay a plastic diaphragm 13 on the soft soil foundation that needs to be treated. After the plastic diaphragm 13 crosses the low soil embankment 14, it is compacted by air-tight compacted soil 15. 11) Pour water onto the plastic diaphragm 13 to a depth of 10cm; 12) Turn on the vacuum pump 12 to put the area under the plastic diaphragm 13 into a vacuum state. When the vacuum degree under the plastic diaphragm 13 reaches -75 kPa, turn on the air compressor 8. The air compressor pressure is maintained at 70% of the pressure of the pre-construction building foundation. After seven days, the air compressor pressure is increased to 120% of the pressure of the pre-construction building foundation. 13) After the ground settlement reaches the design requirements, shut down the vacuum pump 12 and start the air compressor 8, remove the water accumulated on the plastic diaphragm 13, and remove the plastic diaphragm 13, pressurizing branch pipe 6 and pressurizing main pipe 7, vacuum branch pipe 10 and vacuum main pipe 11. 14) Concrete is poured into the expanded rubber hose 3 through the upper opening of the plastic rigid pipe 1; 16) Seven days later, the construction site was cleaned up and the joint soft soil treatment was completed.

[0014] The present invention has been described according to embodiments, the essence of which is: 1. Horizontal pressure is used in the soft soil treatment process; 2. Horizontal pressure is not affected by the pressurization rate; 3. The combined soft soil treatment method includes both the combination of vertical pressure and horizontal pressure, and the combination of applying horizontal pressure and vacuum pre-compression; any soft soil treatment method that applies non-vertical pressure and any combined soft soil treatment method that applies vertical pressure and any non-vertical pressure falls within the protection scope of the present invention.

Claims

1. A horizontal pressure application system comprising a plastic rigid pipe (1), a drainage board (2), a rubber hose (3), a rubber hose bottom seal (4), a concrete root pile (5), a pressure branch pipe (6), a pressure main pipe (7), an air compressor (8), a filter sand tank (9), a vacuum branch pipe (10), a vacuum main pipe (11), a vacuum machine (12), a plastic diaphragm (13), a low soil weir (14), and airtight compacted soil (15), characterized in that... One end of the rubber hose (3) is connected to the plastic rigid pipe (1) and fixedly installed. The other end of the rubber hose (3) is fixedly installed with a rubber hose bottom seal (4). The drainage board (2) is fixedly attached to the outside of the rubber hose (3). The pressurizing branch pipe (6) is connected to the plastic rigid pipe (1) and fixedly installed. The pressurizing main pipe (7) is connected to the pressurizing branch pipe (6) and fixedly installed. The pressurizing main pipe (7) is connected to the air compressor (8) and fixedly installed.

2. The horizontal pressure application system as described in claim 1, characterized in that: The concrete root pile (5) is formed by pouring concrete into the expanded rubber hose (3) after the soft soil foundation treatment is completed.

3. The horizontal pressure application system as described in claim 1, characterized in that: The filter sand tank (9) is 40cm wide, 30cm deep, and its length is consistent with the length of the soft soil area to be treated; the vacuum branch pipe (10) has small holes at 10cm intervals, with a hole diameter of 1cm. The vacuum branch pipe (10) is connected to and fixedly installed with the vacuum main pipe (11). The vacuum main pipe (11) is connected to and fixedly installed with the vacuum machine (12); the low soil embankment (14) is piled up around the soft soil area to be treated; the plastic diaphragm (13) is laid on the soft soil to be treated, and after crossing the low soil embankment (14), it is compacted by the air-tight compacted soil (15).

4. A combined soft soil treatment method using a horizontal pressure system as described in claim 1, characterized in that... Includes the following steps: 1) Prepare the site, remove weeds, silt, etc. within the soft soil area to be treated, and make the site level; 2) Mark the location of the drainage board (2) with lime. The drainage board (2) is arranged in a square with a center-to-center distance of 1.2m. 3) Use machinery or manual labor to insert the drainage board (2), rubber hose (3), and rubber hose bottom seal (4) into the soft soil to the design depth. The top of the plastic hard pipe (1) should be flush with the ground. Seal the top of the plastic hard pipe (1) with a plastic plug. 4) After all the drainage boards (2), rubber hoses (3), and rubber hose bottom seals (4) in the soft soil area to be treated are inserted, remove the plastic plug that is sealing the top of the plastic hard pipe (1); 5) Connect and fix the pressurized branch pipe (6) to the plastic rigid pipe (1), connect and fix the pressurized main pipe (7) to the pressurized branch pipe (6), and connect and fix the pressurized main pipe (7) to the air compressor (8); 6) Excavate a filter sand trench (9) along the direction of the pressurized branch pipe (6) with the drainage board (2) as the center; 7) Fill the filter sand tank (9) with fine sand; 8) Lay the vacuum branch pipe (10) on the filter sand tank (9), connect the vacuum branch pipe (10) to the vacuum main pipe (11) and fix it, and connect the vacuum main pipe (11) to the vacuum machine (12) and fix it. 9) Construct a low earthen embankment around the soft soil foundation area that needs to be treated (14); 10) Lay a plastic diaphragm (13) on the soft soil foundation that needs to be treated. After the plastic diaphragm (13) crosses the low soil embankment (14), it is compacted by air-tight compacted soil (15). 11) Pour water onto the plastic diaphragm (13) to a depth of 10cm; 12) Turn on the vacuum pump (12) to put the area under the plastic diaphragm (13) under a vacuum. When the vacuum level under the plastic diaphragm (13) reaches -75 kPa, turn on the air compressor (8). The air compressor pressure is maintained at 70% of the pressure of the pre-constructed building base. After seven days, the air compressor pressure is increased to 120% of the pressure of the pre-constructed building base. 13) After the ground settlement reaches the design requirements, turn off the vacuum pump (12), turn off the air compressor (8), remove the water on the plastic diaphragm (13), remove the plastic diaphragm (13), remove the pressurizing branch pipe (6) and pressurizing main pipe (7), and remove the vacuum branch pipe (10) and vacuum main pipe (11). 14) Concrete is poured into the expanded rubber hose (3) through the upper opening of the plastic rigid pipe (1); 16) Seven days later, the construction site was cleaned up and the joint soft soil treatment was completed.

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