CN213539022U

CN213539022U - Shallow drainage device for dynamic compaction foundation treatment

Info

Publication number: CN213539022U
Application number: CN202021476138.6U
Authority: CN
Inventors: 俞强; 林生法
Original assignee: Fujian Provincial Institute Of Architectural Design And Research Co ltd
Current assignee: Fujian Provincial Institute Of Architectural Design And Research Co ltd
Priority date: 2020-07-23
Filing date: 2020-07-23
Publication date: 2021-06-25
Anticipated expiration: 2030-07-23

Abstract

The utility model discloses a shallow drainage device for dynamic compaction ground is handled, including filter, filter screen, pumping equipment and filter material. The filter of outsourcing filter screen sets up in drainage focus department, and pumping equipment sets up in the filter bottom, and pumping equipment's drainage end extends to outside the filter, and the filter material sets up all around along the filter is peripheral. The utility model discloses handle the moisture in the soil layer that thickness is less than 6.0m and groundwater level is higher and filter concentratedly, then, arrange outside gathering up the water in the filter through pumping equipment to reduce the moisture content in the soil fast, improve the efficiency and the effect of dynamic compaction ground processing. After the dynamic compaction foundation is treated, the filter can be recycled, so that the construction cost and the data waste are reduced, and the green and low-carbon engineering requirements are met. The device has simple and reasonable structure, convenient construction, low cost and easy implementation, and has important popularization and application values.

Description

Shallow drainage device for dynamic compaction foundation treatment

Technical Field

The utility model relates to a drainage technical field is handled to the ground, in particular to shallow layer drainage device for dynamic compaction ground is handled.

Background

The newly filled soil is used as a site construction land, and the requirements of buildings or sites on foundation settlement and bearing capacity cannot be met due to the fact that the pore ratio is often large and the uniformity is poor, so foundation treatment is required. The foundation treatment method is characterized by that it adopts the discrete material composite foundation reinforcement and composite foundation reinforcement with adhesive strength to make foundation treatment, such as compaction pile, cement mixing pile, rotary spraying pile and CFG pile, etc. said foundation treatment method is high in cost and long in construction period, and can be used for local portion under the foundation of building, and if it is used for large-area ground, it is not an ideal foundation treatment method due to high construction cost and low construction speed, and the dynamic compaction foundation treatment is low in cost and high in construction speed, so that it adopts the dynamic compaction method to treat large-area ground foundation.

The high underground water level is often caused by the infiltration of surface water and rainwater in the filling layer, the shallow filling is in a wet-saturated state, the deep filling is in a saturated state, at the moment, if the dynamic compaction is directly adopted for foundation treatment, the energy generated by the dynamic compaction is absorbed by water, larger hyperstatic pore water pressure is caused instantly, if the hyperstatic pore water pressure cannot be dissipated in time, rubber soil is easily caused, and the reinforcing effect cannot be basically achieved. When the underground water level is higher, a special drainage measure is needed, the water level is reduced to the deep part, meanwhile, in the dynamic compaction construction process, the drainage measure can accelerate dissipation of the generated hyperstatic pore water pressure, and the dynamic compaction foundation treatment effect and efficiency are effectively improved.

When thicker (generally, the treatment depth is more than 8.0 m) filled soil, dredger fill and soft soil are treated, in order to improve the treatment effect and efficiency of the dynamic compaction foundation, the conventional dynamic compaction foundation treatment method generally adopts a dewatering measure in combination, and the dewatering measure usually adopts conventional pipe well dewatering and vacuum well point dewatering. Because the conventional pipe well and the vacuum well have poor vibration and interference resistance, the pipe well and the vacuum well can be greatly damaged under the action of dynamic compaction, and the precipitation effect and efficiency are seriously influenced. If the method of dewatering the filling layer with the thickness less than 6.0m by using a tube well or a vacuum well point is also adopted, the dewatering method is not adopted by the tube well or the vacuum well point because the cost is high and the cost performance is not high.

In summary, it is a technical problem to be solved by those skilled in the art to provide an efficient drainage device for treating soil layers (fill layers and thin silt-containing fill layers) with a thickness less than 6.0m and a high groundwater level, so as to reduce the groundwater level of the soil layers and accelerate the hyperstatic pore water pressure generated during the dynamic compaction construction process.

Patent number ZL2019204817537 discloses a drainage system for a dynamic compaction area, which is mainly applied to a backfill field area needing dynamic compaction foundation treatment; the method is characterized in that the drainage system is lengthened along with the increase of the earth backfill height, but the method has the following problems that 1, the drainage system is inconvenient to construct, the construction quality of the drainage system is difficult to control, particularly, filter materials are not densely and unevenly backfilled, fine particles in backfilled earth can be taken away in the water pumping process, meanwhile, a water filter pipe can be blocked, and the drainage effect is reduced; 2, the earthwork backfilling is inconvenient due to the influence of a drainage system, and the construction progress of the earthwork backfilling is influenced; in the 3-site large-area earthwork backfilling process, effective measures are difficult to take to protect the filter pipes, and great adverse effects can be caused on the filter pipes, for example, bridge type filter pipes are easy to incline and damage.

If the above patent technology is directly used for treating soil layers with thickness less than 6.0m and higher underground water level, the following problems can occur, and the construction and installation process of the filter pipe is inconvenient; 2, the difference of the water filter is not large compared with that of a common dewatering well, and the bridge type water filter pipe structure has poor anti-interference and vibration performance under the influence of dynamic compaction, so that the water filter pipe is inclined, cracked and damaged; 3 after the dynamic compaction foundation treatment is finished, the bridge type water filter pipe is not easy to take out and recycle due to the deformation and inclination factors, and even if the bridge type water filter pipe can be taken out and recycled, the bridge type water filter pipe is not favorable for secondary use.

Disclosure of Invention

The utility model relates to a shallow layer drainage device for dynamic compaction ground is handled, its aim at, handle the higher soil layer (the bed of fill and contain the bed of fill of thin layer silt) of thickness less than 6.0m and groundwater level to the dynamic compaction method and provide a shallow layer drainage device. The method is used for reducing the water level of the soil layer, accelerating the hyperstatic pore water pressure generated in the dynamic compaction construction process and improving the treatment effect and efficiency of the dynamic compaction foundation.

The utility model discloses a following technical scheme realizes: a shallow drainage device for dynamic compaction foundation treatment comprises

The filter is arranged at the drainage concentration point and is a reinforcement cage supported by the reinforcement, and the reinforcement cage is coated with a filter screen;

the water pumping equipment is arranged at the bottom of the filter, and the water discharging end of the water pumping equipment extends out of the filter;

and the filter material 4 is filled at the drainage concentration point and around the periphery of the filter.

Further, the diameter of the steel reinforcement cage is 300-600 mm, and the length of the steel reinforcement cage is 3-4 m.

Furthermore, the diameter of the longitudinal bars used by the steel reinforcement cage ranges from 12mm to 18mm, and the number of the longitudinal bars ranges from 6 to 10.

Furthermore, the diameter of the spiral stirrups used by the steel reinforcement cage is 6-10 mm, and the distance between the stirrups is 100-200 mm.

Further, the filter screen 2 is made of geotextile and nylon net.

Further, the geotextile is 300g/m 2.

Further, the nylon net is 40-60 meshes.

Further, the water pumping device is a water pump.

Furthermore, the filter material is the breccia, and the particle size of the breccia is not more than 50 mm.

Compared with the prior art, the utility model has the advantages that:

1. the utility model discloses can be used to the dynamic compaction and handle thickness and be less than 6.0m, and the higher soil layer of groundwater level (filling layer and the filling layer that contains thin layer silt), through to shallow filling layer or contain the moisture in the foundation soil of thin layer silt and filter and concentrate, then, arrange outside gathering up the water in the filter through pumping equipment to reduce the soil layer water level fast and accelerate the hyperstatic pore water pressure that produces in the dynamic compaction work progress, improve the efficiency and the effect of dynamic compaction foundation processing.

2. After the dynamic compaction foundation is treated, the filter (steel reinforcement cage) can be recycled, so that the construction cost and the data waste are reduced, and the green and low-carbon engineering requirements are met.

3. The utility model discloses simple structure is reasonable, construction convenience and low cost, and easy implementation has important popularization and application and worth.

Drawings

Fig. 1 is a schematic overall structure diagram of an embodiment of the present invention;

fig. 2 is a schematic view of the filter shown in fig. 1.

Description of reference numerals: 1-filter, 2-filter screen, 3-pumping equipment and 4-filter material.

Detailed Description

The invention is explained in detail below with reference to the accompanying drawings:

the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without any creative work belong to the protection scope of the present invention.

Please refer to fig. 1 and fig. 2. Fig. 1 is a schematic overall structure diagram of an embodiment of the present invention; fig. 2 is a schematic view of the filter shown in fig. 1.

In a specific embodiment, the drainage device for dynamic compaction foundation treatment comprises

The filter 1 is arranged at the drainage concentration point and is a reinforcement cage supported by a reinforcement, and the reinforcement cage is coated with a filter screen 2;

the water pumping equipment 3 is arranged at the bottom of the filter 1, and the water discharging end of the water pumping equipment 3 extends out of the filter 1;

and the filter material 4 is filled at the drainage concentration point and around the periphery of the filter 1.

The specific use (layout) method is as follows:

after the field is leveled, a digging machine or a long-arm digging machine is used for temporarily digging a pit with the depth of 3-4 m on site, the slope of the pit is slowed to 1:0.5, and the stability of the excavated earth on site can be determined. According to the excavation depth, a reinforcement cage is processed on site, the length of the manufactured reinforcement cage is 0.2m higher than the depth of a pit, a filter 1 is manufactured, and a filter screen 2 is firmly connected with the filter 1. And (3) hoisting the reinforcement cage into the excavated pit by using an excavator, and ensuring that the verticality deviation of the reinforcement cage is less than or equal to 0.5%. And backfilling the gravel around the filter 1 and the pit wall until the gravel is backfilled to the level of the ground to be used as a filter material 4. The water extraction device 3 is placed in the bottom of the filter 1. The filter 1 can be arranged in a grid shape in a plane, the spacing can be distributed according to the water content of the stratum and the rainfall condition during construction, and the horizontal distance of the general plane is 15-30 m. After the filter 1 is constructed for 1-2 days, the water pumping device 3 is started to pump the water level in the filter, the water level can be firstly reduced to 3.0m below the ground surface, and the water discharging end of the water pumping device 3 is arranged outside the field to ensure that the pumped water cannot flow back to the field. And then performing dynamic compaction construction, wherein the water level of underground water is reduced by 3.0m, so that the dynamic compaction effect and efficiency of shallow foundation soil are greatly improved. Meanwhile, in the dynamic compaction construction process, the generated hyperstatic pore water is automatically collected in the filter 1, and the water is timely drained through the water pumping equipment 3, so that the water content in the soil is quickly reduced, rubber soil is prevented from being generated, the dynamic compaction effect and efficiency of deep foundation soil are improved, and the whole foundation soil can be uniformly and effectively treated from shallow to deep. After the dynamic compaction foundation is treated, the filter can be recycled, so that the construction cost and the data waste are reduced, and the green and low-carbon engineering requirements are met. The device has simple and reasonable structure, convenient construction, low cost and easy implementation, generates important economic benefit in the implementation case, and has the value and significance of popularization and application.

The filter 1 is a reinforcement cage formed by field manufacturing of reinforcements, the diameter of the reinforcement cage is 500mm, and the length of the reinforcement cage is 4.2 m. The diameter of the longitudinal ribs is 16mm, and the number of the longitudinal ribs is 8. The diameter of the spiral stirrup is 8mm, and the distance between the stirrups is 150 mm. Because the drainage point pore-forming does not need the rig, adopts the machine of digging to excavate on-spot and forms, the pore-forming is convenient, and simultaneously, the required raw and other materials of filter preparation are easy for drawing materials, simple process and low in cost. The diameter and the length of the filter 1 can be determined according to the thickness and the water level of a field processing soil layer, when the underground water level of the field foundation soil is higher, the diameter of the filter can be properly increased, and when the thickness of the processing soil layer is thicker, the length of the filter can be properly increased. The number of the steel bars used by the filter is required to ensure that the steel bar cage is not deformed when being hung, and the filter cannot be damaged due to excessive deformation of the steel bar cage in the dynamic compaction construction process. After the dynamic compaction foundation is treated, the filter can be recycled, so that the construction cost and the data waste are reduced, and the green and low-carbon engineering requirements are met.

The filter screen is composed of geotextile and nylon net. The specification of the geotextile is 300g/m2, and the nylon net is 40-60 meshes. The specification of the nylon net is selected according to the particle size of the processed soil layer particles, the pore diameter of the nylon net is smaller than the particle size of the soil layer particles, and therefore it is ensured that the soil layer particles do not enter the filter 1 and are pumped away by the pumping equipment 3 in the pumping process.

The water pumping equipment is a water pumping pump, and the water pumping pump is low in water pumping cost in the aspect of material drawing.

The filter material 4 is the gravel, the particle size of the gravel is not more than 50mm, the minimum particle size is more than 3 times of the diameter of the nylon mesh opening, the specific particle size and proportion can be determined according to the water filtering speed and effect, and the specific limitation is not made herein.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides a shallow layer drainage device for dynamic compaction ground is handled which characterized in that: it comprises

The filter (1) is arranged at the drainage concentration point and is a reinforcement cage supported by the reinforcement, and the reinforcement cage is coated with a filter screen (2);

the water pumping equipment (3) is arranged at the bottom of the filter (1), and the water discharging end of the water pumping equipment (3) extends out of the filter (1);

and the filter material (4) is filled at the drainage concentration point and around the periphery of the filter (1).

2. The shallow drainage device for dynamic consolidation foundation treatment according to claim 1, wherein: the diameter of the steel reinforcement cage is 300-600 mm, and the length of the steel reinforcement cage is 3-4 m.

3. The shallow drainage device for dynamic consolidation foundation treatment according to claim 1, wherein: the diameter of the longitudinal bars used by the steel reinforcement cage is 12-18 mm, and the number of the longitudinal bars is 6-10.

4. The shallow drainage device for dynamic consolidation foundation treatment according to claim 1, wherein: the diameter of the spiral stirrup used by the steel reinforcement cage is 6-10 mm, and the distance between the stirrups is 100-200 mm.

5. The shallow drainage device for dynamic consolidation foundation treatment according to claim 1, wherein: the filter screen (2) is made of geotextile and nylon net.

6. The shallow drainage device for dynamic consolidation foundation treatment according to claim 5, wherein: the geotextile is 300g/m²。

7. The shallow drainage device for dynamic consolidation foundation treatment according to claim 5, wherein: the nylon net is 40-60 meshes.

8. The shallow drainage device for dynamic consolidation foundation treatment according to claim 1, wherein the pumping equipment (3) is a water pump.

9. The shallow drainage device for dynamic consolidation foundation treatment according to claim 1, wherein the filter material (4) is a gravel with a particle size of not more than 50 mm.