Construction method of composite ground foundation

Abstract

The present invention provides one foundation reinforcing construction process. The present invention has standard penetration as the control standard for the hole depth and laminated extruded stuffing to ensure the homogeneous pile shaft reinforcing density, makes the pile shaft material and the earth body around the piles to act together, depositing plain concrete in the part near the ground surface to raise the foundation reinforcing quality. The construction process includes the following steps: punching and expanding the earth body in the pile position with slender hammer until meeting the standard penetration; filling hole with reinforcing material and tamping one layer by one layer until reach certain depth to ground surface; and depositing plain concrete into the pile hole.

Description

technical field [0001] The invention relates to the field of civil engineering, in particular to the reinforcement treatment of foundations. Background technique [0002] In the foundation reinforcement treatment of buildings, such geological conditions are often encountered: the building is located on the newly filled soil layer or the soft undisturbed soil layer (hereinafter referred to as the weak soil layer), and the bearing capacity of the weak soil layer is low, which cannot meet the Under the soft soil layer, there is undisturbed soil that meets the strength and deformation requirements of the upper load at a certain depth, and in most cases, the depth of the soft soil layer is different due to geological changes. [0003] In the face of such geological conditions, vibrating crushed stone piles are one of the commonly used foundation treatment methods. It uses vibrating drill bits and high-pressure water to liquefy the foundation soil to form holes. After the mud is d...

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Problems solved by technology

This method can improve the bearing capacity of the foundation to a certain extent, but since the force of the vibration is to diffuse to the soil on both sides of the pile body, but cannot spread to the soil below the pile body, it is impossible to further improve the bearing capacity of the pile and give full play to the pile capacity. force, and at the same time caused construction environmental pollution due to the discharge of mud

[0004] Compacted gravel piles are also one of the commonly used foundation treatment methods. They use heavy hammers to tamp and compact the filled stones until they reach the surface of the foundation. Compared with vibrating crushed stone piles, the reinforcement and compaction effect of the pile body can be significantly improved. , but the pile length and filling amount are fixed values, which cannot be adjusted according to the local softness of the stratum soil, resulting in certain differences in the treatment strength and deformation of each layer of soft soil, so that under the long-term action of the upper load , it is easy to cause uneven settlement of the foundation, resulting in quality problems such as cracking of the building wall

At the same time, when the packing is compacted closer to the surface, the side limit provided by the weak foundation is not enough. If the packing compaction operation is repeated, it is easy to cause the soil on the ground to be uplifted and damaged, forming rubbery soil, which seriously reduces the effect of foundation reinforcement treatment.

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