Pile foundation

 

(57) Abstract:

The invention relates to the construction, in particular for pile foundations of buildings and structures erected on ground subsidence. The technical result of the invention is to increase the bearing capacity of pile Foundation with hanging piles while reducing the number of piles. Pile Foundation includes hanging piles and the pile cap is provided with supports, which are made in the form of fixed arrays of ground, located on the mainland or on soft ground, and communicate with the lower ends of the hanging piles. Each support is made of a two-stage, upper stage, interacting with the lower end of the hanging piles made strength not less than 2.5 MPa, and the bottom step is performed strength of at least 0.25 MPa while soaking. The upper level supports are made of a height not less than 1.5 m and a diameter of not less than 3 times the diameter or width of longest side hanging piles, and the lower level of support - diameter, not less than 6 times the diameter or width of longest side hanging piles. 3 C.p. f-crystals, 1 Il.

The invention relates to the construction, in particular to the foundations of buildings and structures erected on collapsible soil is Vai stands, passing through the entire thickness of the loose layer and based their lower ends to the mainland (the rock solid, almost not compressible clay, dense macro-grained rock soil). On top of piles rack are connected by a grillage (see , for example, L. E. Ya: "Calculation and design of parts of civil buildings", publisher Budivelnik Kiev, 1972, S. 293-294).

However, if these foundations are acceptable in all cases for soil type I of the subsidence, the thickness of which does not exceed 10-12 m, it is not always appropriate for soil type II of the subsidence, the thickness of which reaches 30-50, and sometimes more meters.

Make piles of such length is not economically viable, and sometimes simply impossible.

A prototype of the selected pile Foundation containing hanging piles, connected by top grillage (see, for example, L. E. Ya, "Calculation and design of parts of civil buildings", publisher Budivelnik Kiev, 1972, S. 293-294).

Selected for the prototype of the Foundation are used when the layer of solid ground, able to accept the load of the weight of a building or structure, lies at a depth, in which the use of pile-racks technically infeasible or economically naselenia is runte) exceeds the number of piles racks.

This is because the pile-stand transfer the load from the building or structure on the mainland, which includes their lower ends, and hanging piles transmit the load on the Foundation, mainly due to friction of its side surfaces on the ground.

Therefore, the number and length of the hanging piles in the Foundation is chosen so as to provide the required degree of compaction of soil, which would provide the desired value of the lateral friction.

However, to achieve the desired values of side friction only by increasing the number and length of the hanging piles is not always possible. As a consequence, the currently developed many piles with the original design, the purpose of which is to increase the friction between pile and soil (see, for example, ABT. mon. USSR N 1742417, MKI E 02 D 3/046). But the widespread application of such piles is not received due to the high complexity of their manufacture.

For increasing values of side friction also use a number of methods of soil compaction, such as pre-watermove pits, vibroplate, seal explosion, etc. However, all these methods are time-consuming, and the effectiveness of their small.

Technical challenge Sobranie number of piles.

The invention consists in that the pile Foundation, including hanging piles and the pile cap is provided with supports, which are made in the form of fixed arrays of ground, located on the mainland or weak ground and communicate with the lower ends of the hanging piles.

Each support is made of a two-stage, upper stage, interacting with the lower end of the hanging piles made strength not less than 2.5 MPa, and the bottom step is performed strength of at least 0.25 MPa while soaking.

The upper level supports are made with a minimum height of 1.5 meters and a diameter of not less than 3 times the diameter or width of longest side hanging piles. The bottom supports are made with a diameter of not less than 6 times the diameter or width of longest side hanging piles.

In addition, the upper level supports are made ground-cement, and the lower level is formed by chemical grouting of the soil.

The proposed pile Foundation with hanging piles designed for multi-storey civil and industrial construction for collapsible soil type II. This Foundation has the same carrying capacity as the Foundation with piles racks.

The invention is illustrated in the drawing, which schematically hanging pile of the proposed Foundation, interacting with the support.

Pile Foundation contains hanging piles 1, scored in subsidence of the ground 2 and the United grillage (not shown). The lower ends of the hanging piles 1 interact with the upper stages 3-stage supports. The lower level 4 two supports placed on the mainland or on soft ground, 5.

Each of the upper stage 3 is executed strength of at least 2.5 MPa, with a minimum height of 1.5 meters and a diameter of not less than 3 times the diameter or width of longest side hanging piles 1.

Given the size of the upper stage 3-stage support are the most optimal to ensure reliable bearing ends hanging piles 1. However, they can be different.

The upper stage 3 is made a ground-cement, but may also be formed by chemical grouting of the soil.

Each lower stage 4 completed strength of at least 0.25 MPa while soaking. That is, the lower stage 4 represents, as mokou.

The diameter of the lower-stage 4-stage supports not less than 6 times the diameter or width of longest side hanging piles 1.

This is imperative if reliance is not placed on mainland soil, and low soil strength properties which drastically reduced when soaking. This diameter of the lower step 4 helps to reduce the specific pressure footings on weak soil and, consequently, eliminates the drawdown of the Foundation.

In cases where reliance is placed on mainland soil, the diameter of the bottom stage 4 may be less or even equal to the diameter of the upper stage 3.

The bottom 4 is formed by chemical grouting of the soil.

The proposed pile Foundation arrange as follows.

In the subsiding soil 2 form the upper stage 3 two supports by, for example, injection or trebovaniya cement, which, mixing with the soil, forms a ground-cement mixture. After curing, the ground-cement mixture and the formation of the upper stages 3 form the lower stage 4 by injection through the injectors fixing solution. After a set of fixed soil require is their lower ends in the upper-stage 3-stage supports.

Top hanging piles 1 connect the raft.

The order of operations in the pile Foundation may be somewhat different.

First score in subsidence of the ground 2 hanging piles 1, and then form their bottom ends of the two supports in the same manner as described above.

1. Pile Foundation including hanging piles and the pile cap, characterized in that it is provided with supports, which are made in the form of fixed arrays of ground, located on the mainland or weak ground and communicate with the lower ends of the hanging piles, with each bearing is made of a two-stage, top notch support, communicating with the lower end of the hanging piles made of a height not less than 1.5 m in diameter, not less than 3 times the diameter or width of the longest side of the pile, and strength not less than 2.5 MPa and lower supports are made strength of at least 0.25 MPa while soaking.

2. Pile Foundation under item 1, characterized in that the lower level of support when placed on mainland soil executed in diameter, not less than 3 times the diameter or width of the longest side of the piles.

3. Pile Foundation under item 1, characterized in that the lower Stupino more sides of the piles.

4. Pile Foundation according to any one of paragraphs.1 to 3, characterized in that the upper support is made a ground-cement, and the lower level is formed by chemical grouting of the soil.

 

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FIELD: building, particularly for erecting pile-plate foundations for industrial buildings and structures, for instance for main buildings of heat power plants.

SUBSTANCE: method involves arranging drilled cast-in-place pile, grouting plate grillage and installing antivibration mounts. Anchorage reinforcement is placed in pile heads and arranged along marked building axes. Anchorage reinforcement is then grouted and resilient antivibration mounts are installed at pile heads. Resilient antivibration mounts are fixed in plane on anchorage reinforcement with the use of fasteners so that antivibration mounts may perform restricted movement. Installed on antivibration mounts is rigid metal foundation frame of upper building in which anchoring reinforcement for securing skeleton of building to be erected is installed. Reinforcement rods and supply lines are inserted in process orifices formed in foundation frame beams and frame is grouted to form panel grillage.

EFFECT: reduced work content, increased simplicity and speed of bearing grillage frame erection; improved building stability.

9 cl, 5 dwg

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