Features of composite piles

Composite piles – reinforced concrete structures with multiple sections consisting of several elements that are connected to each other. They create a support for thirty-six meters long. Production conditions are stipulated in GOST 19804-2012. This set of standards is adopted in six countries of the Soviet Union, and in Russia entered into force in early 2014.

Application

Any of reinforced concrete piles is used for the support of the foundation and deepened to the level of high-blooded soil. If the sole is located in the ground is not very good, the foundation will not be quite sustainable, which will cause the soil sewing under the mass of construction.

Composite piles are used in instability of the upper layer of the soil of the construction site: if it has a big thick, than the length of piles. As a rule, it is not allowed to be based on the base of piles to such unstable soils, like a barried soil, peatlands, fluid and stripped clay soil, or soil soils. In the above-mentioned soils, only the pile foundation will have stability and the necessary bearing capacity.

In addition, piles are used when restoring the available pile bases, which enhances this foundation. To do this, use the minimum sizes of structures consisting of five-meter sections.

Concrete products are equipped with piles on objects. The same structures are quite commonly used in construction companies that do not have a copral installation.

Standard primer than 12 meters long. Composite reinforced concrete piles also apply if it is impossible to use conventional piles due to geological conditions. Such piles are used, for example, in construction work produced in Moscow, for foundations of residential buildings, industrial buildings and a variety of civilian purposes.

The purpose of reinforced concrete pile is the transmission of vertical loads. This will avoid shrinkage facilities during construction and operation.

In the ground, it can be used not alone, but all kinds, provided that at the necessary depth of the soil, there is a weak layer of rock and it is impossible to carry out support.

Before proceeding with work, composite piles must pass a static test that will show the possibilities to withstand the types of load. Load test drive pass and joint joints. In the construction of foundations, such piles are used as hanging and piles-racks.

If building buildings are assumed, followed by an increase in the load of the speaker, composite piles are better not to use to bookmark the foundation.

Design

Composite piles are manufactured according to GOST standards. They consist of top and bottom connecting parts.

Such piles have such sections as:

  • 30×30 cm – the length of such a cross section is ranging from 14 to 24 meters;
  • 35×35 cm, 40x40cm – from 14 to 28 meters.

The lengths of the connecting parts may vary. In the product, a cross section of which is 30×30 cm, the length of the lower base is from 7 meters, which with each step increases to 12 meters; The piles with a cross section of 35×35 cm and 40×40 cm the length of such a base ranges from 8 to 14 meters. As for the upper section, the piles of 30×30 cm it is in the range of 5-12 meters, and piles 35×35 and 40×40 – 6-14 meters.

Docking is made in such ways:

  • Welding pinned glass joint;
  • connection of sheet steel linings, which crimp the pile trunk;
  • bolt connection of the crimping element;
  • connection with the help of a folding lock;
  • pin.

Composite piles must be reinforced by the longitudinal armofrokas, manufactured from the class A2 and A3 rod with a diameter of 13-20 mm. The transverse strengthening of the trunk is made by a metal mesh of the C-1 wire with a minimum diameter of 5 mm.

For the production of piles body use heavy concrete not lower than M200. Filling is a fine-flower crushed stone with a diameter of no more than 40 mm.

Reinforcement can occur on preliminary tension technology. Before pouring a concrete into shape, the armature framework is stretched by a hydraulic jack. This manufacturing technology gives the maximum stability resistance.

Distinctive features

A feature of this variety of screw piles is to build the length of the trunk to the desired value with the help of extension cords. A knot of dusting of two parts is represented by rigid connection with welding mount.

If you comply with extension production technology, the process of lengthening screw piles at the construction site will not affect the supporting abilities of the material, durability, strength and stability of the foundation.

This is determined by the soil strength and the carrying capacity by material, which is determined by the strength of the material.

Specifications

In the table below you will see some of the calculations:

Piles 30 * 30 cm, length 13-24 meters

Section section 300 mm, series 1.011.1-10, Issue 1

Name

Length (millimeter)

Width (millimeter)

Height (millimeter)

Weight (ton)

Volume (cubic. m)

Section

Weight (T)

Volume (cubic. m)

C130-s

13,000

300

300

3

1,2

C50.30-VV. sixteen

1,13

0.45

C140-US

14,000

3,2

1,3

C60.30-VV. sixteen

1,4

0.54

C150-than

15000

3,4

1,4

C70.30-VV. sixteen

1,6

0,6

C160-s

16000

4

1,44

C80.30-VV 1/6

2

0.72

C170-s

17000

3.8

1.5

C80.30-NSV-3

0.73

C180-s

18000

4,1

1,6

C90.30-VV. 2.3 / 6

2,03

0.8

C190-US

19000

4.3

1,7

C100.30-VV. 2/6

2,3

0.9

C200-s

20000

4.5

1,8

C110.30-VV. 3/6

2.5

0.99

C210-US

21000

4.7

1.9

C120.30-VV. 3/6

3

1.08

C220-s

22000

five

2

C80.30-NSV. sixteen

2

0.73

C230-US

23000

5,2

2.07

C120.30-NSV. 3/6

2.7

1.09

C240-s

24000

5,4

2,2

Piles 35 * 35 cm, length 13-28 meters

Section section 350 mm, series 1.011.1-10, Issue 1

Name

Length (millimeter)

Width (millimeter)

Height (millimeter)

Weight (ton)

Volume (cubic. m)

Section

Weight (T)

Volume (cubic. m)

C130-s

13000

350

4.03

1,6

C50.35-VV. 2/6

1,6

0,6

C140-US

14000

4,34

1,7

C60.35-VV. 2/6

1.9

0,7

C150-than

15000

4,64

1.9

C60.35-VV-4

C160-s

16000

4,96

2

C70.35-VV. 2/6

2,2

0.9

C170-s

17000

5.3

2,11

C80.35-VV. 2.4 / 6

2.5

one

C180-s

18000

5.6

2,23

C90.35-VV. 2/6

2.8

1,1

C190-US

19000

5.9

2,4

C100.35-VV. 2/6

3,08

1,23

C200-s

20000

6,2

2.5

C110.35-VV. 3/6

3,4

1,4

C210-US

21000

6.5

2.6

C120.35-VV. 3/6

3.7

1.5

C220-s

22000

6,82

2.7

C130.35-VV. 3/6

4

1,6

C230-US

23000

7,13

2.9

C140.35-VV. 4/6

4,3

1,7

C240-s

24000

7.44

3

C80.35-NSW. 2.4 / 6

2.5

one

C250-s

25000

7,75

3,1

C120.35-NSW. 3/6

4

1.5

C260-s

26000

8.06

3,2

C120.35-NSV-4

3.7

1,47

C270. -St

27000

8,4

3,4

C140.35-VV. 4/6

4.3

1,7

C280-US

28000

8,7

3.5

Piles 40 * 40 cm, length 13-28 meters

Section section 400 mm, series 1.011.1-10, Issue 1

Name

Length (millimeter)

Width (millimeter)

Height (millimeter)

Weight (ton)

Volume (cubic. m)

Section

Weight (T)

Volume (cubic. m)

C130-s

13000

400

5,2

2.08

C50.40-VV. 2/6

2

0.8

C140-US

14000

5.6

2.24

C60.40-VV. 2/6

2,4

one

C150-than

15000

6

2,4

C70.40-VV. 2/6

2.8

1,12

C160-s

16000

6,4

2.6

C80.40-VV. 2/6

3,2

1,3

C170-s

17000

6.8

2.7

C90.40-VV. 3/6

3.6

1,44

C180-s

18000

7,2

2.9

C100.40-VV. 3/6

4

1,6

C190-US

19000

7.6

3.04

C110.40-VV. 4/6

4,4

1,8

C200-s

20000

eight

3,2

C120.40-VV. 4/6

4.8

2

C210-US

21000

8,4

3,4

C130.40-VV. 4/6

5,2

2.08

C220-s

22000

8.8

3.5

C140.40-VV. 5/6

6

2.24

C230-US

23000

nine

3.7

C80.40-nsv. 2/6

3,3

1,3

C240-s

24000

9.6

3.8

C120.40-nsv. 4/6

4.9

1,94

C250-s

25000

10

4

C140.40-nsv. 5/6

5,7

2,3

C260-s

26000

10.4

4,2

C270-s

27000

eleven

4.3

C280-US

28000

11,2

4.5

    Types and labeling

    According to the provision of GOS, the following types of composite products are distinguished:

    • piles with a solid quadratic cross section;
    • hollow piles with a circular cross section;
    • Piles-shell.

    Composite piles have a unified labeling like C260.35. Sv, where:

    • C is reinforced concrete pile with a solid square cross section;
    • 260 – the length of all components in decimeters;
    • 35 – cross section of the trunk in centimeters;
    • SV – type of connection.

    Immersion technique

    Composite piles are immersed in the soil with a shock drill, which is carried out with the help of diesel or hydraulic hammer. In no cases should be applied when the vibrating loaders are connected, since the connecting parts under such an effect are deformed and become unsuitable for exploitation.

    Bringing technology occurs in the following order:

    • the sling of the lower part, then the establishment of the barrel in the vertical position to the place of the driving;
    • The head of piles must be supplied under the headwaters of the puffy hammer, which is equipped with a standing element that prevents deformation when driving;
    • reconciliation of vertical position, centering of the axis and its relationship to the axis of the shock part of the diesel hammer;
    • The initial strikes should be carried out at a capacity of 20-25%, which is necessary for the right positioning at the first stage of the immersion;
    • After reaching piles of 1.5-5 meters, a complete power is dried until the section of the section will be higher than the soil by 30-50 cm;
    • The second section is joined by the already scored in the ground (accuracy of movement is necessary);
    • The joint of the mortgage glasses is attached to electric arc welding, after which the composite pile is dried.

    At the end, it is necessary to protect the weld with anti-corrosion kuzbasslak – coal lacquer.

        Foundations from clogged piles require a huge consumption of metal. However, this minus is easily eliminated if preframed piles without transverse reinforce will be involved more, if not with the final replacement.

        For more dense and durable soils are used piles having a collet connection. In the lower junction is concreted a sleeve with a field at the end, shuffled plate.

        The strength in the place of the collet connection increases the strength of the entire pile, but it also has limitations:

        • The abilities of the collet joint should not exceed 60 tons;
        • Piles of the collet compound can only be used in the “hanging” condition – a restriction on the conditions of the soil.

        Building composite pile – in the next video.

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