CN216238478U

CN216238478U - Soft soil foundation haplopore deep drainage device that calms anger

Info

Publication number: CN216238478U
Application number: CN202122818005.3U
Authority: CN
Inventors: 王君; 孙红月; 沈青松; 陈琦; 洪广鹏; 舒俊炜; 郑娟; 常纪磊; 付超
Original assignee: Ningbo Zhongjiao Water Transport Design And Research Co ltd; Zhejiang University ZJU
Current assignee: Ningbo Zhongjiao Water Transport Design And Research Co ltd; Zhejiang University ZJU
Priority date: 2021-11-17
Filing date: 2021-11-17
Publication date: 2022-04-08
Anticipated expiration: 2031-11-17

Abstract

The utility model relates to a single-hole deep air compressing and draining device for a soft soil foundation, which comprises an air compressing pipe and a draining pipe, wherein a draining cavity body and a gas diffusion cavity body are respectively embedded in the soft soil foundation, and the gas diffusion cavity body is positioned below the draining cavity body; the upper end surface of the gas diffusion cavity body is provided with a connecting port and is connected with a gas pressing pipe through the connecting port, and the gas pressing pipe extends out of the ground surface along the vertical direction of the soft soil foundation and is communicated with an inflator pump; a connecting port is formed in the upper end face of the drainage cavity body, the drainage cavity body is connected with a drainage pipe through the connecting port, one end of the drainage pipe extends into the bottom of the drainage cavity body, and the other end of the drainage pipe extends out of the ground surface along the vertical direction of the soft soil foundation; the deep soft soil foundation deep drainage is realized, and the deep soft soil drainage consolidation time is shortened.

Description

Soft soil foundation haplopore deep drainage device that calms anger

Technical Field

The utility model belongs to the technical field of geotechnical engineering, and particularly relates to a soft soil foundation single-hole deep air compression and drainage device.

Background

The soft soil foundation has the characteristics of high natural water content, large pore ratio, strong compressibility, low permeability, poor bearing capacity and the like. When a building is built on a soft soil foundation, the foundation is easy to excessively subside due to engineering load, the duration of the consolidation settlement of the foundation is very long due to the low permeability of the soft soil, particularly, under the engineering condition that the thickness of a soil layer of the soft soil foundation is large, the natural drainage consolidation time can last for decades to hundreds of years due to the long drainage path of underground water flowing out of the ground surface in the deep soft soil foundation, and the normal use of the engineering is often influenced by the excessive post-construction settlement, even engineering disasters are generated. The currently adopted loading preloading method, vacuum preloading method and the like have good drainage consolidation effect on shallow soft soil, but have poor drainage consolidation effect on deep soft soil, long time for realizing deep soft soil drainage consolidation treatment requirement and high engineering cost. The drainage consolidation of the deep soft soil layer becomes the difficulty of the drainage consolidation treatment of the soft soil foundation, particularly the drainage consolidation of the deep soft soil layer is particularly important on the effective narrow unit area aiming at the bearing pile of a building, and the existing deep soft soil consolidation treatment is adopted, so that the time is too long and the engineering cost is too high.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects in the prior art, and provides a single-hole deep-part air-compressing and water-discharging device of a soft soil foundation, which is suitable for bearing a load-bearing pile of a building, and is used for discharging deep underground water of the soft soil foundation so as to achieve the purposes of accelerating the water-discharging consolidation of the deep soft soil and reducing the settlement deformation of the foundation after construction.

The utility model aims to complete the technical scheme that the soft soil foundation single-hole deep air compression and drainage device comprises an air compression pipe and a drainage pipe, wherein a drainage cavity body and a gas diffusion cavity body are respectively embedded in a soft soil foundation, and the gas diffusion cavity body is positioned below the drainage cavity body; a connecting port is formed in the upper end face of the gas diffusion cavity body, the gas compression pipe is connected with the connecting port, and the gas compression pipe extends out of the ground surface along the vertical direction of the soft soil foundation and is communicated with an inflator pump; a connecting port is formed in the upper end face of the drainage cavity body, the drainage pipe is connected through the connecting port, one end of the drainage pipe extends into the bottom of the drainage cavity body, and the other end of the drainage pipe extends out of the ground surface along the vertical direction of the soft soil foundation; through the setting of above drainage device and bury to soft soil foundation in, can realize the soft soil foundation deep drainage to shorten deep soft soil foundation drainage consolidation time, in order to reach the saturation that reduces the deep soil body, reduce soft soil foundation's post-construction settlement deformation, and satisfy the bearing pile and realize deep soft soil consolidation processing on effectual narrow and small unit area.

Preferably, the gas diffusion cavity body comprises a rigid support and geotextile, the rigid support is a cylindrical body, the geotextile is wrapped outside the rigid support, and the rigid support is vertically embedded along the soft soil foundation; through the arrangement of the structure, the rigidity of the gas diffusion cavity body in the soft soil foundation can be ensured, and meanwhile, the gas diffusion cavity has gas permeability and can prevent the soil body from entering the cavity.

Preferably, the drainage cavity is formed by surrounding and limiting a permeable pipe and is vertically embedded along a soft soil foundation; the drainage cavity has water permeability and can prevent soil from entering the cavity.

Preferably, the outer diameter of the gas diffusion cavity body is greater than or equal to that of the drainage cavity body, and the gas diffusion cavity body is positioned right below the drainage cavity body; make the soft soil foundation more convenient at the drilling deep hole in-process like this, the gas diffusion cavity body is also more convenient with the drainage cavity body is laid simultaneously, and upper and lower normal position between two cavitys is placed, make the atmospheric pressure of the gas diffusion cavity body can be homogenized all the time around the drainage cavity body, make the groundwater that the drainage cavity body oozed in from the soil body more quick, and make the groundwater infiltration that is located the soil body around two cavitys more homogenized, can further make the effective processing that realizes deep weak soil consolidation on effectual narrow and small unit area.

Preferably, the distance between the drainage cavity and the ground surface of the soft soil foundation is more than 8m, and the distance between the drainage cavity and the gas diffusion cavity is 5-10 m; so more be favorable to compressing air to the gas diffusion cavity internal, and more be favorable to the drainage cavity body to the outer drainage of earth's surface to the accessible spacing adjustment, the time control requirement of adaptable drainage consolidation and the soft soil consolidation that adapts to the different degree of depth requirement more can adapt to the bearing pile of different length and realize deep soft soil consolidation on effectual narrow and small unit area and handle.

Drawings

Fig. 1 is a schematic structural view of the soft soil foundation single-hole deep air compressing and water discharging device.

Fig. 2 is a schematic view of the gas diffusion cavity body structure of the present invention.

The reference numbers in the drawings are respectively: 1. pressing the air pipe; 2. a drain pipe; 3. a drainage cavity body; 4. a gas diffusion cavity body; 5. an inflator pump; 6. soft soil foundation; 41. a rigid support; 42. and (4) geotextile.

Detailed Description

The utility model will be described in detail below with reference to the following drawings: as shown in the attached figure 1, the utility model comprises a compressed air pipe 1 and a drain pipe 2, a drain cavity body 3 and a gas diffusion cavity body 4 are respectively embedded in a soft soil foundation 6, and the gas diffusion cavity body 4 is positioned below the drain cavity body 3; a connecting port is formed in the upper end face of the gas diffusion cavity body 4, a gas pressing pipe 1 is welded through the connecting port, and the gas pressing pipe 1 extends out of the ground along the vertical direction of the soft soil foundation 6 and is communicated with an inflator pump 5; a connecting port is formed in the upper end face of the drainage cavity body 3, the drainage pipe 2 is welded through the connecting port, one end of the drainage pipe 2 extends into the bottom of the drainage cavity body 3, so that seepage water from a soil body in the drainage cavity body 3 can be discharged to the outside of the earth surface through the drainage pipe 2 as far as possible, unnecessary loss of drainage driving pressure can be reduced, and the other end of the drainage cavity body extends out of the earth surface along the vertical direction of the soft soil foundation 6; the drainage driving pressure of the drainage cavity body 3 is derived from the transmission of the air pressure driving seepage pressure. Vertical among the above-mentioned indicates with the surface of the earth vertically direction for compress air and drainage efficiency when compressing air and drainage cavity 3 is to drain off water to drain pipe 2 through compressing air pipe 1 in to gas diffusion cavity 4 is more high-efficient like this, and the route of compressing air and drainage shortens greatly, more is favorable to shortening deep soft soil foundation drainage consolidation time.

As shown in fig. 2, the gas diffusion cavity 4 includes a rigid support 41 and a geotextile 42, the rigid support 41 is a cylindrical body, and the geotextile 42 is wrapped outside and vertically embedded along the soft soil foundation 6; the drainage cavity body 3 is defined by a permeable pipe and is vertically embedded along the soft soil foundation 6; vertical among the above-mentioned bury to establish to the axial core line of two cavitys perpendicular with the ground surface, more compact and the efficiency of drainage more high-efficient in arranging in the space, satisfy the bearing pile simultaneously and realize deep weak soil consolidation processing on effectual narrow and small unit area.

The external diameter of the gas diffusion cavity body 4 is greater than or equal to the external diameter of the drainage cavity body 3, because of the degree of depth of deep hole is darker, more be favorable to laying of the gas diffusion cavity body and the drainage cavity body like this, and the gas diffusion cavity body 4 is located the drainage cavity body 3 under, the axle heart yearn of the gas diffusion cavity body 4 is in same straight line with the axle heart yearn of the drainage cavity body 3 promptly, the pneumatics ability of calming anger of the gas diffusion cavity body 4 is more concentrated around the drainage cavity body 3, the transmission of atmospheric pressure drive seepage pressure is more high-efficient, further promote the groundwater in the soil body permeate to the drainage cavity body 3 in and further improve drain pipe 2's drainage efficiency simultaneously.

The principle that gas and liquid always flow along the maximum direction of pressure gradient is utilized, and the pressure gradient is in direct proportion to the pressure difference between two points and in inverse proportion to the distance between the two points; the distance between the drainage cavity body 3 and the ground surface of the soft soil foundation 6 is more than 8m, and the distance between the drainage cavity body 3 and the gas diffusion cavity body 4 is 5-10 m; the interval between the drainage cavity body 3 and the gas diffusion cavity body 4 is big more, the time of drainage can be longer more, but according to actual demand, it is darker if the degree of depth of deep soft soil drainage consolidation, so can only increase the interval between the drainage cavity body 3 and the gas diffusion cavity body 4, interval between the ground surface with drainage cavity body 3 and soft soil foundation 6 also increases simultaneously, can overcome the extension of the drainage consolidation time of deep soft soil like this, the bearing pile that more can adapt to different length simultaneously realizes deep soft soil consolidation on effectual narrow and small unit area and handles.

A construction method of a soft soil foundation single-hole deep air compression and drainage device comprises the following steps:

s1, drilling a deep hole with the depth of at least 13m on the soft soil foundation 6, placing the gas diffusion cavity body 4 with the air pressing pipe 1 at the bottom of the deep hole, filling a soil body into the deep hole to reach the height of at least 5m, then placing the drainage cavity body 3 with the drainage pipe 2 on the filled soil body, and filling the soil body into the deep hole until the soil body is flush with the surface of the soft soil foundation 6; the depth of the general deep hole is 15m, the filled soil body does not need to be compacted, and the drain pipe 2 on the drainage cavity 3 and the air pressing pipe 1 on the gas diffusion cavity 4 are distributed in a mutual staggered manner, so that the air pressing pipe 1 cannot interfere with the drainage cavity 3 when extending out of the ground surface;

s2, pressing air into the air pressing pipe 1 through the inflator pump 5 to enable the air diffusion cavity body 4 to form high air pressure, keeping the air pressure in the air diffusion cavity body 4 to be larger than the pore water pressure of the surrounding soil body and smaller than the self-weight pressure of the soil body, and enabling the air in the air diffusion cavity body 4 to extrude and diffuse towards the surrounding soil body to drive the underground water in the soil body to flow along the direction of the maximum pressure gradient;

s3, in the process of filling air in the gas diffusion cavity body 4, the pressure of the drainage cavity body 3 rises, and when the pressure water head in the drainage cavity body 3 reaches the ground surface, the underground water permeating into the drainage cavity body 3 can flow out of the ground surface through the drainage pipe 2.

In the steps S2 and S3, under the condition that the air compressing pipe 1 is pressurized, the gas diffusion cavity body 4 is in a high-pressure state, underground water of soil around the gas diffusion cavity body is driven to flow to the drainage cavity body 3 with relatively low pressure and short distance by utilizing the high-pressure condition of the gas diffusion cavity body 4, and the underground water is drained to the ground surface through the drainage pipe 2; the drainage drive pressure of drainage cavity 3 derives from the transmission of atmospheric pressure drive seepage pressure in the gas diffusion cavity body 4, and when the distance between drainage cavity body 3 and the gas diffusion cavity body 4 was near, it was more high-efficient as drainage drive pressure that the pressure of this moment in the gas diffusion cavity body 4 was pressed the gas and is entered into drainage cavity body 3 through the soil body, can further improve drainage efficiency, and reduced the drainage consolidation's of deep weak soil time.

The present invention is not limited to the above embodiments, and any changes in the shape or material composition, or any changes in the structural design provided by the present invention, are all modifications of the present invention, and should be considered to be within the scope of the present invention.

Claims

1. The utility model provides a soft soil foundation haplopore deep drainage device that calms air, includes compressed air pipe (1) and drain pipe (2), its characterized in that: a drainage cavity body (3) and a gas diffusion cavity body (4) are respectively embedded in the soft soil foundation (6), and the gas diffusion cavity body (4) is positioned below the drainage cavity body (3); a connecting port is formed in the upper end face of the gas diffusion cavity body (4), the gas compression pipe (1) is connected through the connecting port, and the gas compression pipe (1) extends out of the ground along the vertical direction of the soft soil foundation (6) and is communicated with the inflator pump (5); the connector has been seted up to the up end of drainage cavity body (3), and through the connector connection has drain pipe (2), just the one end of drain pipe (2) stretch into to the bottom of drainage cavity body (3), the other end is along the vertical of soft soil foundation (6) and stretch out to outside the earth's surface.

2. The soft soil foundation single-hole deep air compressing and water discharging device according to claim 1, characterized in that: the gas diffusion cavity body (4) comprises a rigid support (41) and geotextile (42), wherein the rigid support (41) is a cylindrical body and wraps the geotextile (42) at the outer side, and the geotextile is vertically embedded along the soft soil foundation (6).

3. The soft soil foundation single-hole deep air compressing and water discharging device according to claim 1, characterized in that: the drainage cavity body (3) is formed by surrounding and limiting a permeable pipe and is vertically embedded along a soft soil foundation (6).

4. The soft soil foundation single-hole deep air compressing and water discharging device according to claim 1, characterized in that: the outer diameter of the gas diffusion cavity body (4) is larger than or equal to that of the drainage cavity body (3), and the gas diffusion cavity body (4) is located under the drainage cavity body (3).

5. The soft soil foundation single-hole deep air compressing and water discharging device according to claim 1, characterized in that: the distance between the drainage cavity body (3) and the ground surface of the soft soil foundation (6) is larger than 8m, and the distance between the drainage cavity body (3) and the gas diffusion cavity body (4) is 5-10 m.