RU2094567C1 - Method for erection of underground structures - Google Patents

Abstract

FIELD: construction engineering. SUBSTANCE: this relates to technology of erecting walls in subsurface ground at building of relieving and load-bearing walls for underground premises. According to method, bore-holes are drilled for cast-in-place columns at distance between them less than diameter of column with subsequent concreting them. Odd columns are made of concrete, and even columns are additionally strengthened by reinforcement framework. Diameter of reinforcement framework is 10-15% less than diameter of even column. EFFECT: high efficiency. 2 dwg

Description

 The invention relates to the construction, in particular, to the technology of building walls in the ground, and can be used to create retaining and load-bearing walls.

 A known method of constructing a wall in the ground, including the implementation of piles of the first stage at a distance from each other and the formation of piles of the second stage partially overlapping them in terms of piles of the second stage by making cavities in the soil under the corresponding piles and filling them with concrete, in which the cavities under the second stage piles are performed by drilling holes and subsequent placement in them and the explosion of explosive charges. (USSR author's certificate N 1730355, class E 02 D 5/20, 1992).

 The main disadvantage of the above-described method of "wall in the ground" is the complexity of its construction and the lack of environmental cleanliness.

 Closest to the proposed invention in essence and technical result is a method of erecting underground structures by drilling split ends for bored pillars at a distance less than the diameter of their column, followed by their concreting. (See Smorodinov MI, Fedorov BS, Installation of structures and foundations by the “wall in soil” method. M. Stroyizdat, 1986, p.4-5 prototype).

 The main disadvantage of this method is the lack of reliability of the structure during the construction of the structure having a high load.

 The technical result achieved by the proposed method is the creation of walls in the ground having high reliability with their environmental cleanliness.

 The specified technical result is achieved by the method of erecting underground structures by drilling split ends for bored pillars at a distance less than the diameter of the column, followed by concreting, in which the odd columns are made of concrete, and the even columns are reinforced with reinforcement cages, and the diameter of the frame is 10- 15% smaller than the diameter of the even column.

 The construction of underground structures by the proposed method provides optimal perception of the vertical and horizontal forces acting on the wall, which ensures its high reliability.

 The implementation of the frame of the reinforcement is 10-15% smaller in diameter than the diameter of the column due to the need to create a protective layer between the frame and the ground, which protects the frame from corrosion.

 In FIG. 1 shows the implementation of bored piles; in FIG. 2 cuts; in FIG. 3 top view of bisecting piles.

 The method is as follows.

 The underground wall structure (Fig. 1) consists of bore-cutting piles, usually with a diameter of 0.75-1.5 m, built to a depth of 50 m, depending on the equipment used and the strength of the soil.

 Even columns have a reinforcing cage 1, the diameter of which is 10 cm less than the diameter of the column. Odd pillars 1.3. are made of concrete and have no reinforcing cage. Before starting work, foreshaft 2 is arranged for the entire length of the structure (Fig. 2) and a height of 1 m. In foreshaft 2 there are holes 3 for drill posts.

 The purpose of foreshacht 2 is to create the conditions for high precision construction of pillars. Forschacht is a technological element, and after the construction of an underground structure, it is disassembled.

The work is carried out in the following sequence:
1. Foreshaft 2 with holes 3 for drill posts is concreted.

 2. Odd wells are drilled (1,3,5.) And filling piles are concreted without a reinforcing cage with a distance in the light less than the diameter of the carrier pile.

 3. Between piles of filling with overlapping part of their cross-section, even (2.4,) wells of bearing piles are drilled. The reinforcing cage 1 is lowered into the wells, and concreting is performed.

 Compared to the wall-in-ground method, this method is environmentally friendly, since it does not require the use of special clay solutions when drilling to keep the well from collapse. The well is held by the casing of the drilling unit.

 The proposed method for the construction of underground structures is effectively used in the construction of load-bearing and enclosing structures, including for shallow tunnels, tunnel viaducts at road junctions and intersections with railways, underground passages, during construction near existing buildings and structures, embankments, mooring walls and other structures in hydraulic engineering, deep foundations in difficult hydrogeological conditions.

Claims (1)

 The method of construction of underground structures by drilling split ends for bored pillars at a distance less than the diameter of the column, followed by concreting, characterized in that the odd columns are made of concrete, and the even columns are reinforced with reinforcement cages, and the diameter of the frame is 10 15% less diameter of an even column.

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