SU1735494A1 - Method of erecting foundation - Google Patents

Abstract

The essence of the invention: foundation building is carried out by ramming the pit and installing a pyramidal support block in it. When ramming a pit, ramming hard material into the bottom and thereby form a broadened heel. The excavation pit before the installation of the block is covered with soil of natural humidity, into which hydraulic oil can be introduced into the living in the proportion 1: (0.1-0.5). The block has overhangs at the upper end, and rod issues at the bottom. When the block is installed, the overhangs are placed in the trench at the level of the ground surface, and the core issues are anchored in an enlarged patch. 1 epf.z § ill. Yo

Description

The invention relates to the construction and construction of foundations.

There is a known method of building a foundation by driving a pyramidal block into the ground.

Closest to the present invention is a method of building a foundation by ramming a pit to form a broadened heel of rigid material and installing a support block in the pit.

A disadvantage of the known solutions is the large material consumption of the foundations.

v

The purpose of the invention is to reduce the material intensity of the foundation.

The goal is achieved by c. the method of erection of the foundation, which includes ramming the pit, tamping a hard material into its bottom with the formation of a broadened heel and installing a support block in the pit, and installing a foundation pit of a smaller cross section than the pit, and installing the support block with a soil pit natural moisture, while the installation of the support block is performed with the anchoring of the core outlets formed at its lower end in a wider pile and with the formation formed at its upper end weights on the backfill soil at the level of the ground surface of the soil and with a gap relative to the walls of the pit, the value of which is not less than 0.01d, where d is the smallest size in terms of the upper end of the support block, while before installing the support block it is advisable to introduce a hydraulic feed into the soil backfill in proportion 1: (0.1-0.5).

VI

WITH

2

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4b.

FIG. 1 shows a rammed trench with hard material rammed into its bottom; in fig. 2 - the same, when filling the soil in a rammed pit; fig 3 - the foundation.

The method of foundation construction is as follows.

The excavation trench 1 is crushed in with a hard material at least 4.2 b3 (b is the largest size in terms of the lower end of the precast foundation), thus forming a broadened patch 2. Then the soil 3 mixed with natural moisture is poured into the excavation trough. hydraulically hanging in a ratio of 1: (0.1-0.5), after which the precast reinforced concrete support block 4 is hammered, at the lower end of which anchor outlets (rod) 5 are formed with a length of at least half the diameter of pt 2, resulting in the density of the soil 3 filling the foundation pit 1. In the upper part 1 at the end of excavation driving unit 4 overhangs 6 compacted soil 3. The support block has a pyramidal shape. The average section of block 4 is determined by the formula

s - s (l AB Fcp2 Fcpi (I-p-j-J,

where FCpi is the area in the middle section of the rammed pit, m;

Fcp2 area in the middle section of the support block, m2;

pd0 is the density of the soil covered in the pit, t / m3;

pd is the density of the soil after driving into the excavation of the support block, t / m3, the angle of inclination of the faces of the block to the longitudinal axis is 5-15 °. The blocking is completed when the upper end of the support block reaches the ground ground surface, while the block overhangs are located in the rammed trench with a gap of not less than 0, Old / (d is the smallest size in terms of the upper end of the support block taking into account the overhangs), and ground is poured into the pit material of natural moisture, mixed with a hydraulic one in a ratio of 1: (0.1-0.5).

The implementation of the support block with overhangs will ensure the sealing of the buffer layer, which is formed in the upper part of the pit when the support block is immersed in it.

Tilting the edges of the support block to the vertical axis at an angle of 5-15 ° will allow the block to be more effectively submerged in the excavated pit. If the slope is less than 5 °, compaction of the soil around the block will have low values of the soil density, and more than 15 ° - it will be difficult to immerse the block in the excavated pit.

Ramming into the bottom of the pit of hard material in the amount of not less than 4.2b,

where b is the largest size in terms of the lower end of the block, ensures the transfer of permissible pressures to the ground located under the broadened fifth and, at less than 4.2b3, it is possible for the block to be punched and

destruction.

The implementation of core shafts with a length of at least half the diameter of the formed broadening will in all cases reliably zank the supporting block; when executing outlets with a length of less than half the diameter, it is possible, when tensile stresses appear, to pull out the stem outlets and the support block.

Achieving the bottom surface of the ground by the upper end of the block will allow the buffer (loosened) layer of soil to be compacted to a given density.

Placing the overhangs in the rammed

a trench with a gap of less than 0.01 d (d is the smallest size of the upper end of the block, taking into account the overhangs), will avoid compression of air contained in the pores of the soil. This gap is left to

ensure its release to the atmosphere.

Backfilling in the foundation pit of soil material of natural moisture mixed with hydraulic fluid in a ratio of 1: (0.1-0.5) will allow the proposed technology to be used to build foundations in water-saturated sandy and clay soils.

Claims (2)

1. The method of erecting the foundation, which includes tamping the pit, tamping hard material into its bottom with the formation of a broadened patch and installing a support block into the pit, so that, in order to reduce the material intensity of the foundation, the pit a support block is installed of a smaller cross section than the foundation pit, and a foundation pit before installing the support block in it at the same time, the installation is filled up with soil of natural moisture, the support block is made by anchoring — rod-shaped issues formed at its lower end and widened in the upper surface of the ground surface and with a gap relative to the walls of the pit, formed at its upper end of the overhang, whose value is not less than 0.01 d, where d is the smallest size in terms of the upper end of the support block. 2. The method according to claim 1, characterized in that before installing the support unit in the soil of the filling is introduced into the hydraulic one in proportions 1: (0.1-0.5). / 77 ss / l Phie.1 /////////