CN-117758808-B - Soft foundation system reinforced by vacuum combined preloading

CN117758808BCN 117758808 BCN117758808 BCN 117758808BCN-117758808-B

Abstract

The application discloses a soft foundation system for vacuum combined preloading reinforcement, which relates to the field of building foundations and comprises a soft foundation, a middle coarse sand cushion layer, a vacuum sealing layer, a preloading earthwork layer and a drainage device which are sequentially arranged from bottom to top, wherein a sealing gap is formed between the vacuum sealing layer and the middle coarse sand cushion layer, the drainage device comprises a drainage filter tube, a plastic drainage belt and a vacuum pump, the drainage filter tube is paved at the inner side of the sealing gap, the vacuum pump is positioned outside the sealing gap and connected with the drainage filter tube, the main body part of the plastic drainage belt is inserted into the soft foundation, the upper end of the plastic drainage belt extends out of the soft foundation and is connected with the drainage filter tube, the drainage filter tube is sleeved with a spiral steel wire framework, the spiral distance of the spiral steel wire framework is larger than the width of the plastic drainage belt, the outer end of the plastic drainage belt covers the outer circumferential surface of the drainage filter tube, and is positioned between spiral coils of the spiral steel wire framework. The application can make the water filtering holes of the water drainage filter tube fully play a role of ventilation in the vacuumizing process.

Inventors

WANG YAO
WU JINGHUA
YANG ZHENQIN
ZHANG FENG
XU HONGGUANG
GUO XIAO
XIE PINHAN
WANG JIE

Assignees

中建海峡建设发展有限公司

Dates

Publication Date: 20260505
Application Date: 20240130

Claims (6)

1. A soft foundation system for vacuum combined preloading reinforcement is characterized by comprising a soft foundation (1), a middle coarse sand cushion layer (2), a drainage device (5), a vacuum sealing layer (4) and a preloading earth layer (3) which are sequentially arranged from bottom to top, wherein a sealing gap is formed between the vacuum sealing layer (4) and the middle coarse sand cushion layer (2), the drainage device (5) comprises a drainage filter tube (51), a plastic drainage belt (52) and a vacuum pump (53), the drainage filter tube (51) is laid on the inner side of the sealing gap, the vacuum pump (53) is positioned outside the sealing gap and is connected with the drainage filter tube (51), the main part of the plastic drainage belt (52) is inserted into the soft foundation (1), the upper end of the plastic drainage belt (52) extends out of the soft foundation (1) and is connected with the drainage filter tube (51), the drainage filter tube (51) is sleeved with a spiral steel wire framework (54), the spiral gap of the spiral steel wire framework (54) is larger than the drainage belt (52), the spiral gap is positioned at the outer peripheral surface of the drainage filter tube (51), the spiral filter tube (55) is coated with the spiral filter tube (51), the limiting elastic piece (55) is positioned at one side of the plastic drainage belt (52) far away from the drainage filter tube (51); The drainage filter tube (51) is provided with a positioning rod (57), the positioning rod (57) comprises an inserting section (571) and a hook section (572), the hook section (572) is used for holding the drainage filter tube (51), and the inserting section (571) is inserted into the soft soil foundation (1); The arc angle of the hook section (572) is larger than 180 degrees, the hook section (572) has a holding force on the outer peripheral surface of the drainage filter tube (51), and one end of the hook section (572) far away from the plug section (571) is provided with a guide section (573) in an extending mode; The positioning rod (57) is provided with a plurality of reinforcing rods (574) in a surrounding manner along the circumferential direction, the reinforcing rods (574) are mutually abutted, and the reinforcing rods (574) and the inserting sections (571) of the positioning rod (57) form a rod bundle together; The water drainage filter tube (51) is inserted with a locating plate (56) through a water filtering hole, the locating plate (56) is of a strip shape, two side edges of the locating plate (56) are simultaneously abutted to the water filtering hole edge of the water drainage filter tube (51), one end of the locating plate (56) is provided with a locating hook (561), and the locating hook (561) is hooked with a steel wire of the spiral steel wire framework (54).
2. The vacuum combined preloading reinforced soft foundation system of claim 1, wherein the length of the limiting elastic piece (55) is larger than the spiral distance of the spiral steel wire framework (54), two ends of the limiting elastic piece (55) are respectively inserted into gaps between the spiral steel wire framework (54) and the drainage filter tube (51), the middle part of the limiting elastic piece (55) is abutted against the surface of the plastic drainage belt (52) far away from the drainage filter tube (51), and the limiting elastic piece (55) forces the plastic drainage belt (52) to be abutted against the surface of the drainage filter tube (51).
3. The soft foundation system for vacuum combined preloading reinforcement according to claim 2, wherein two ends of the limiting spring plate (55) are respectively provided with an arc-shaped portion (551) in an extending mode, the concave side of the arc-shaped portion (551) faces away from the drainage filter tube (51), and the concave side of the arc-shaped portion (551) abuts against a steel wire of the spiral steel wire framework (54).
4. The soft foundation system for vacuum combined preloading reinforcement according to claim 2, wherein the edge of one side of the limiting elastic sheet (55) is a sawtooth edge (552), an obtuse angle is formed between the tooth tip of the sawtooth edge (552) and the surface of the limiting elastic sheet (55), and the tooth tip of the sawtooth edge (552) is abutted against the surface of the plastic drainage belt (52).
5. The soft foundation system for vacuum combined preloading reinforcement according to claim 1, wherein clamping hooks (553) are respectively arranged at two ends of the limiting elastic sheet (55), the clamping hooks (553) face the drainage filter tube (51), and the clamping hooks (553) are used for clamping steel wires of the spiral steel wire framework (54).
6. The soft foundation system for vacuum combined preloading reinforcement according to claim 1, wherein a guide sleeve (575) is sleeved at the lower end of the rod bundle, the guide sleeve (575) is provided with a water filtering hole, the guide sleeve (575) is provided with a bottom wall, and the bottom wall of the guide sleeve (575) and the central line of the guide sleeve (575) are inclined relatively.

Description

Soft foundation system reinforced by vacuum combined preloading Technical Field The application relates to the field of building foundations, in particular to a soft foundation system reinforced by vacuum combined preloading. Background The vacuum combined preloading foundation treatment method is a foundation treatment mode which combines preloading and vacuum preloading to form superposition of two load actions, and mainly comprises a drainage system, a sealing system and a pressurizing system. The plastic drainage belt is inserted into the soft soil layer by using the plugboard machine, and the horizontal drainage filter pipes are connected to form the vertical and horizontal drainage systems. The pressure formed by vacuumizing of the pressurizing system is utilized to accelerate rising and discharging of pore water, so that the sedimentation process of the soft soil foundation is accelerated, the foundation is compacted and reinforced, and the bearing capacity of the foundation is improved. Is a foundation treatment process technology which is used for reinforcing soft foundation in coastal areas in recent years. In the vacuum preloading process, the vacuum pump applies negative pressure to the soft soil foundation through the drainage filter tube and the plastic drainage belt. The drainage filter tube is paved between the middle coarse sand cushion layer and the vacuum sealing layer, the upward part of the drainage filter tube is contacted with the vacuum sealing layer, and the downward part is contacted with the middle coarse sand cushion layer, so that the water filtering holes on the surface of the drainage filter tube can not fully play the role of circulating air in the vacuumizing process, and the vacuumizing effect is limited. Disclosure of Invention In order to enable the water filtering holes of the water draining filter pipe to fully play a role in ventilation in the vacuumizing process, the application provides a soft foundation system reinforced by vacuum combined preloading. The soft foundation system for vacuum combined preloading reinforcement provided by the application adopts the following technical scheme: The soft foundation system comprises a soft foundation, a middle coarse sand cushion layer, a drainage device, a vacuum sealing layer and a preloading earth layer which are sequentially arranged from bottom to top, a sealing gap is formed between the vacuum sealing layer and the middle coarse sand cushion layer, the drainage device comprises a drainage filter tube, a plastic drainage belt and a vacuum pump, the drainage filter tube is laid on the inner side of the sealing gap, the vacuum pump is located outside the sealing gap and connected with the drainage filter tube, the main body part of the plastic drainage belt is inserted into the soft foundation, the upper end of the plastic drainage belt extends out of the soft foundation and is connected with the drainage filter tube, a spiral steel wire framework is arranged on the drainage filter tube, the spiral distance of the spiral steel wire framework is larger than the width of the plastic drainage belt, the outer end of the plastic drainage belt covers the outer peripheral surface of the drainage filter tube, and is located between spiral coils of the spiral steel wire framework. By adopting the technical scheme, the soft foundation system reinforced by vacuum combined preloading can promote the pore water in the soil body to be discharged in an accelerated manner through the combined action of vacuum preloading and preloading, so that the soft foundation can be rapidly drained and solidified. The vacuum pump vacuumizes a sealing gap between the coarse sand cushion layer and the vacuum sealing layer through the drainage filter tube and the plastic drainage belt. Through establish spiral steel wire skeleton at the drainage filter tube cover, make the drainage filter tube can keep certain clearance between with the well coarse sand bed course, and make the vacuum seal layer be difficult to shelter from the upper portion of drainage filter tube, make drainage filter tube drainage hole up and drainage hole down can keep the intercommunication with sealed clearance. On the premise of a certain distribution density of the drainage holes of the drainage filter tube, the utilization rate of the drainage holes of the drainage filter tube can be increased, so that the vacuum pump can perform vacuum pumping operation more smoothly. On the other hand, the spiral steel wire framework is sleeved on the drainage filter tube, so that the steel wire spiral framework can replace the preloading of the bearing part of the drainage filter tube, the drainage filter tube is protected, and the situation that the drainage filter tube is deformed under compression is reduced. Moreover, under the condition that the upper end of the plastic drainage belt wraps the drainage filter tube, the upper end position of the plastic drainage belt is arranged between