Construction device and construction technique for concrete pipe base

Abstract

The invention discloses a construction device and the construction technology of a concrete pile foundation, which is applied to the construction of the foundation project of the bored concrete pile in the building field. The device comprises a top pressure type static pile pressing-in machine, a hydraulic cylinder connected with a pressure gauge a retaining cylinder connected with the top pressure type static pile pressing-in machine and an internal tube, the length of the internal tube is longer than that of the retaining cylinder; a flat head blanking plug is arranged at the lower end of the internal tube; a vibration device is arranged on the retaining cylinder and a feed inlet is opened on the side wall of the retaining cylinder. The key points of the construction technology are that: the builders rubbish is utilized to form a loose bearing platform at the bottom of the pile end, then the no-slump concrete is used for building a solid bearing platform on the loose bearing platform at the bottom of the pile end; a plurality of middle bosses are formed at the different heights of the pile; then the file is finished by lifting the internal tube, placing a reinforcing cage, casting and vibrating the concrete. The pile made according to the invention has high and uniform carrying capacity; the carrying capacity of the bearing platform can be read from a pressure gauge, which reduces the artificial error.

Description

technical field [0001] The invention relates to a construction device and a construction process of a concrete pouring pile used for foundation engineering in the field of construction. Background technique [0002] At present, there are many methods for forming the foundation concrete pouring piles of construction projects, including two kinds of tamping and static pressure. The existing rammed and expanded pile technology uses a heavy hammer to ram the hole. During the ramming process, as the rammed heavy hammer descends, the casing descends to protect the hole wall of the pile to form a pile hole, and then the pile hole is Fill in the construction waste and continue to tamp to form a pile end bulk bearing platform at the lower end of the pile, then fill the pile hole with dry hard concrete, continue to tamp to form a pile tip solid bearing platform, The force platform and the solid bearing platform at the pile end bear the load of the building together with the pile body...

AI Technical Summary

Problems solved by technology

But the technology of this pile foundation construction has following shortcoming: 1, this technology can produce vibration when adopting heavy hammer to ram, both influence the quality of adjacent completed pile, produce certain harm to adjacent building again

2. When using this technology, the vertical bearing capacity of a single pile can only be inferred from experience, and because the geological conditions vary greatly, the reliability of the inference of the bearing capacity is poor, and the construction quality is not easy to control

But this patent has the following disadvantages: according to the description of its patent content, when it squeezes the masonry in the outer tube with the inner tube after it is filled with masonry in the outer tube, its inner tube does not stretch out below the bottom of the outer tube, and the inner tube just Extrude the masonry in the outer tube, and stop when the pressure displayed on the pressure gauge reaches the design value. The disadvantages of this method are: 1. Since the lower end of the inner tube is not pressed out of the lower end of the outer tube, the gap between the filler in the outer tube and the outer tube There is a lot of friction between them. Most of the readings of the pressure gauge at this time come from this frictional resistance, which creates the illusion that the readings of the pressure gauge are on the high side. The actual pressure acting on the expansion head at the bottom of the pile does not reach the design value, resulting in The bearing capacity of the pile foundation is insufficient, causing construction hidden dangers

2. The lower end of the inner tube described in this patent document is not sealed, so that the extrusion of the material cannot be realized, that is, piling cannot be done

After the enlarged head of these loose bodies is formed, the pile body is pressed on the loose material, and some pile bodies are likely to pierce the loose material, resulting in excessive settlement and damage to the building due to uneven settlement.

4. As mentioned in this patent document, when the steel cage is placed in the outer pipe and the concrete is poured and then the outer pipe is lifted, the inner pipe under the downward pressure of the static pressure cylinder will withstand the concrete, which will cause the steel cage to be marked with high pressure and low pressure, and will be crushed, making it Distortion and deformation damage the structure of the pile body and affect the bearing capacity

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