CN212001035U

CN212001035U - Long and short pile reinforcement foundation in high roughness place

Info

Publication number: CN212001035U
Application number: CN201922083733.7U
Authority: CN
Inventors: 邓超; 杨文豪; 吴琼
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-11-27
Filing date: 2019-11-27
Publication date: 2020-11-24
Anticipated expiration: 2029-11-27

Abstract

The utility model relates to a length stake in high roughness place adds muscle foundation, this foundation stabilization scheme mainly includes: the soft soil layer is covered with a filling soil layer, a reinforced cushion layer, long piles and short piles and is used for reducing the differential settlement of the field under the action of load; the arrangement form of long and short piles is adopted in the soft foundation, the length of the piles in the middle part is larger than that of the piles on the periphery, and the piles are gradually shortened from the middle part to the piles on the periphery. The geosynthetic material is mainly used in the whole field, 2-3 layers are preferably paved, and the pile tops of the long and short piles are all contacted with the reinforced cushion layer. The pile, the soil and the rib are stressed in a coordinated mode, the structure is simple and stable, the sedimentation deformation can be effectively controlled, and the flatness is improved.

Description

Long and short pile reinforcement foundation in high roughness place

Technical Field

The utility model relates to a construction field structure, concretely relates to ground structure that settlement place difference subsides is particularly suitable for in the high weak soil foundation place of roughness requirement, belongs to engineering ground processing method.

Background

With the development of economy in China, the scale of engineering construction is unprecedented. Because China has wide territory, large difference of geological and soil conditions and different engineering function requirements, various foundation treatment technologies are widely applied. In order to fully utilize the bearing capacity of the natural foundation, improve the engineering economy and shorten the construction period, the composite foundation is produced at the same time, and is popularized and applied nationwide, thereby generating good social and economic benefits.

In recent years, in order to meet higher requirements of civil engineering construction on foundation treatment, various composite foundation treatment technologies are developed in China. However, in the case of some fields with high requirements for settlement control, such as sports fields in soft soil areas, the requirement of high flatness is often not met. Conventional methods for treating large-area sites in coastal areas, such as prepressing, dynamic compaction, cement-soil mixing piles and the like, still tend to generate large differential settlement. Under the action of load, the whole field can be settled in a saddle shape, the settlement of the middle part is large, and the settlement of the periphery is small. The appearance of the settlement form makes the field with high flatness requirement unable to satisfy its service function, and the later-stage field maintenance cost is increased. Therefore, how to save the engineering investment and ensure the engineering quality and meet the requirements of small differential settlement and high flatness of the field is very important.

SUMMERY OF THE UTILITY MODEL

To the defect that prior art exists, the utility model aims to provide a ground reinforced structure-long pile unites geosynthetic material suitable for high roughness place. The method is characterized in that: the foundation stabilization scheme mainly comprises: and the soft soil layer is covered with a filling layer, a reinforced cushion layer, long piles and short piles. In order to solve the problem that a large-area soft soil field generates saddle-shaped settlement under the load effect and improve the field flatness, a soft soil foundation is treated by flexible piles. Meanwhile, the method adapts to the settlement change, adopts the arrangement form of long and short piles, the length of the piles in the middle part is larger than that of the piles around, and the piles are gradually shortened from the middle part to the piles around in a plane arrangement form. Considering the rigidity difference between the pile and the soil, the pile is easy to pierce the ground surface to cause the surface to be uneven, and a certain number of layers of geosynthetic materials with certain rigidity are paved on the upper part of the pile top. The pile tops of the long and short piles are in contact with the bottom surface of the reinforced cushion layer, and the pile tips of the long and short piles are located in the weak soil layer. The pile length of the shortest pile is 1/3-2/3 of the pile length of the longest pile, the pile length of the shortest pile is not too small, and the pile diameter can be the same or changed according to the field condition. The geosynthetic material is generally paved with 2-3 layers, the number of layers is not suitable for paving too many, and the layer spacing is preferably 300-500 mm and is not less than 200 mm. The pile, the soil and the rib are stressed in a coordinated mode, the structure is simple and stable, and the settlement deformation can be effectively controlled.

Compared with the prior art, the utility model has the following outstanding characteristics:

the traditional treatment method has poor economy, and a large number of pile foundations are often needed to realize small maximum sedimentation and sedimentation difference and high flatness. And the geosynthetic materials with proper layers are arranged in the fill layer, so that the using amount of the pile can be reduced, the rigidity of the reinforcement material can be fully exerted, and the optimized settlement control is realized. If the geosynthetic material is used alone, the effect of reducing the sedimentation is limited. The reinforcement layer is combined with the pile foundation, and the soil arch effect caused by differential settlement of pile soil and the tension film of the reinforcement layer form load transmission and redistribution phenomena, so that the differential settlement is greatly reduced. Adopt the form that the pile length changes, comply with the settlement trend in place, subside big region in the middle part and use long pile, subside to reducing gradually all around, correspondingly use shorter pile foundation, can more accurate control subside, make the ground surface flatness in place higher.

Drawings

Fig. 1 is a schematic view of the vertical structure of the present invention.

Fig. 2 is a plan view of the present invention.

Detailed Description

1. The construction site should be leveled in advance, and the obstacles on the ground and underground must be removed. And (3) carrying out technical pile testing according to design before pile foundation construction, wherein the quantity of the pile testing is not less than 3. And (3) measuring and setting out, preparing a working surface, releasing the pile position, ensuring that the deviation of the pile position does not exceed the requirements of the specification and design, and showing the plane layout in figure 2.

2. If the cement soil mixing pile is adopted, the concrete construction steps are as follows: the stirring machine is positioned and leveled; the bottom plate of the mixing pile is kept horizontal and vertical to the guide frame during construction; pre-mixing and sinking to the designed reinforcement depth; spraying and stirring to lift to a preset slurry stopping surface; repeatedly stirring and sinking to the designed reinforcement depth; spraying or only stirring to lift to a preset slurry stopping surface according to design requirements; the stirring mechanism was turned off. Other pile types refer to relevant construction specifications.

3. The piling sequence is to be sequentially pushed from the middle of the field to the periphery according to the length of the piles, namely, the long piles 4 are firstly pushed, and then the short piles 5 are pushed. The pile length is preferably arranged as a group according to 2-5 and gradually changed, and numerical simulation results show that the influence of the stepped long piles 4 and the stepped short piles 5 on the sedimentation is close to the effect of the linear gradually-reduced long piles 4 and the linear gradually-reduced short piles 5, and the construction procedures can be greatly reduced.

4. And after the construction of the foundation pile foundation is finished, constructing the reinforcement cushion layer 3. The method comprises the steps of firstly leveling a field, paving a layer of geosynthetic material at the junction of the field and a pile foundation, generally considering the use of geogrids, covering the whole field, and ensuring that a reinforcement material is level and straight. And after the bottommost reinforced layer is laid, backfilling the upper part and filling soil, compacting, then laying a second layer, continuously backfilling and compacting layer by layer, wherein the number of laying layers of the geosynthetic material is determined according to the situation of the site, 2-3 layers are recommended to be laid, and the layer spacing is determined according to the requirements of relevant specifications.

5. When the geosynthetic material is laid, the geosynthetic material should be longitudinally and transversely arranged, mainly uniform and flat, and certain tightness is kept, so that the geosynthetic material is stressed uniformly in a working state, and local stress concentration caused by piercing and bursting of rock blocks and the like is avoided. The geosynthetics may be joined by overlapping, stitching or bonding. The filling material should be backfilled layer by layer in the order of two sides and the middle.

And finishing the construction of other processes of the site.

Claims

1. A long and short pile reinforcement foundation suitable for a high-flatness field is characterized by comprising a soft soil layer (1), an overlying filling layer (2), a reinforcement cushion layer (3), long piles (4) and short piles (5); the reinforced cushion layer (3) is positioned in the upper covering soil filling layer (2), and pile tips of the long piles (4) and the short piles (5) are positioned in the soft soil layer (1).

2. A long and short pile reinforced foundation suitable for a high-flatness site according to claim 1, wherein long piles (4) are used at a position where the settlement amount in the middle of the site is larger, and are arranged in a plane form that the piles become shorter from the middle to the surrounding piles, and the pile length of the shortest pile (5) is 1/3-2/3 of the pile length of the longest pile (4).

3. The long and short pile reinforced foundation suitable for the high-flatness sites as claimed in claim 1, wherein the top ends of the long piles (4) and the short piles (5) are provided with geogrids made of geosynthetic materials, the reinforced cushion layers (3) are multi-layered, and the geogrids are arranged between the adjacent reinforced cushion layers (3); the pile tops of the long piles (4) and the short piles (5) are in contact with the reinforced cushion layer (3).