CN2313958Y - Cement and soil composite pile - Google Patents

Abstract

The utility model relates to a soil-cement composite pile, which is characterized in that soil-cement piles with lower intensity are inserted with prefabricated pile bodies with higher intensity. Since the prefabricated pile bodies are inserted into the soil-cement pile bodies, the load of the upper parts of the pile bodies is passed to the prefabricated piles, the prefabricated piles pass the load to soil cement through the action between the soil cement and the prefabricated piles, and the load is then passed to foundation soil. Therefore, the transitional course from strong to weak is formed from the pile cores to the earth mass through the transition of the soil cement, which increases bearing capacity. Since the cost of the soil-cement piles is 1/5 of that of the prefabricated piles, project cost can be saved. In foundation pit support project, the soil cement in the composite pile can prevent water leakage and the prefabricated pile can bear most of the soil pressure, which can also achieve a better economic effect.

Description

A kind of cement-soil composite pile

The utility model belongs to the building class, relates in particular to a kind of cement-soil composite pile.

At present, varied in the pile foundation engineering pile type, the steel bar concrete that has commonly used gives system stake and cement earth pile.Steel bar concrete gives its normal section intensity height of system stake, steady quality, use comparatively extensive, but because strength of the mixing pile height, for the active force (being frictional force and end load) between the soil is adapted in its normal section intensity, often stake need be done very longly, and to the darker geological conditions of bearing course at pile end buried depth, economic benefit is relatively poor; If stake is done too shortly, then can not give full play to its normal section intensity, bearing capacity is lower.The cement earth pile that adopts modes such as deep layer stirring or high-pressure rotary-spray to make, strength of the mixing pile is low, unit price is low, also often be used for retaining soil, the waterproof of the composite foundation and the pattern foundation pit supporting structure of multi-storey building, because strength of the mixing pile is too low, can not give full play to the active force between the soil, not high as the pile foundation bearing capacity; As pattern foundation pit supporting structure,, often to could satisfy stressed requirement with a lot of campsheds because shearing resistance, bending resistance are relatively poor.

The purpose of this utility model is exactly in order to overcome the shortcoming of above-mentioned technology, gives full play to steel bar concrete and gives a system stake intensity height, cement earth pile and the big characteristics of soil body contact surface, and the cement-soil composite pile of very economical again of high while of a kind of bearing capacity is provided.

A kind of cement-soil composite pile is characterized in that being made up of intensity lower cement earth pile and the bigger system of the giving pile body of intensity, gives the system pile body and inserts in the cement earth pile.

Because giving the system pile body inserts in the cement soil pile, the load on pile body top is passed to and is given the system stake, give system stake and pass to cement-soil by the effect between cement-soil and the system of giving again, and then pass to foundation soil, form the progressive formation a little less than the persistent erection from the stake heart to the soil body by the transition of cement-soil like this, given full play to the performance of two kinds of materials, improved bearing capacity, because the price of cement earth pile is only given 1/5 of system stake, thereby has saved construction costs widely.In foundation pit supporting project, the cement-soil in the composite pile prevents to seep water, gives the system pile and carries on a shoulder pole most of soil pressure, also can obtain good economic effect.

Fig. 1 is a schematic diagram of the present utility model;

Fig. 2 is the schematic cross-section of Fig. 1.

Below in conjunction with the example explanation.As shown in Figure 1 and Figure 2, the 1st, give the system stake, the 2nd, cement earth pile, the utility model cement-soil composite pile is made up of cement earth pile and the bigger system of the giving pile body of intensity that intensity is lower, gives the system pile body and inserts in the cement earth pile.

In actual engineering, the cement earth pile of at first constructing adopts present conventional method, and cement-soil is stirred, and water/binder ratio should guarantee that cement soil pile was in flow regime before the system stake is given in insertion more than 1.0.After cement earth pile is finished, will give the system stake at once and insert, rely on give the system stake from gravity, give the system stake and can insert cement earth pile about 3/4 automatically, re-use external force and can make and give the position that the system stake arrives design, treat that cement-soil solidifies after, cement-soil composite pile is promptly made.Give the system stake and can adopt reinforced concrete pile etc.

This cement-soil composite pile has following characteristics: the common matter of present walling pile such as broken pile, discrete, undergauge can not occur The amount problem; Speed of application is fast; The bearing capacity height, the C40 of a diameter 800mm cement earth pile interpolation 300mm * 300m Reinforced concrete pile, bearing capacity can reach more than 100 tons; Construction costs is low; Be widely used, both can be used for tier building The basis also can be used as the lagging pile of pattern foundation pit supporting structure.

Claims (1)

1. A kind of cement-soil composite pile is characterized in that being made up of intensity lower cement earth pile and the bigger system of the giving pile body of intensity, gives the system pile body and inserts in the cement earth pile.

Images