The method of expansion of the grounds under the sole foundation

 

(57) Abstract:

The use in construction in the construction of strip Foundation. The inventive method includes the descent into the mountain the production of the device to extend its Foundation, the push elements extenders in wall framing spacer body having in longitudinal section the shape of a wedge, and the extraction of the formed cavity extension elements extenders. With the expansion of the grounds of trench excavations as elements extenders use two cylinders, the sum of the diameters of which are equal to the width of the trench. The cylinders have along the walls of the trench. The drive to push the elements extenders cylinders. 1 C.p. f-crystals, 2 Il.

The invention relates to the construction of the tape monolithic foundations created by the method of "wall" and can be used during construction in silty-clay soils that are in jugoplastika, soft-plastic consistency.

During the construction of foundations in an open pit project work provides the following processes: passage of the pit, its drainage, preparation of substrate, the device fu is camping by making them relevant gradients or the use of special fasteners.

Increasing volumes of earthworks require implementation in the construction practice of new progressive methods of building foundations. One of such methods is a method conventionally referred to as "slurry wall".

There is a method of construction of the foundations of the "wall in the ground", which is in the construction of load-bearing walls of underground facilities through the passages of the deep trenches with vertical walls under a clay solution, followed by laying in a trench monolithic or precast concrete or reinforced concrete (1. Fig.56. S. 109).

When monolithic concrete or reinforced concrete walls concrete mix is placed in the trench method of vertically moving the pipe. In some cases, the deep foundations that are constructed by the method of "wall", organized by drilling and filling with concrete intercept wells (2.Fig.II.4B, S. 240).

They are then filled with the concrete mixture, and after curing of the concrete and set them considerable strength are drilling a third hole between them and then filled it with concrete, and so on up until the intersecting borehole gradually form a wall of the desired length and depth. With this method the There is a method of creating a fortified reference array in soils (ed.St. N 1470848, E 02 D 31/00), which represents education of wells, the drilling of these wells cracks in the ground by means of a jet of liquid and filling gaps as cutting concrete mix and the introduction into it of the reinforcement cage.

The disadvantages of the considered methods are:

the need to have a powerful additional water sources and septic tanks for the formation of the pulp;

the difficulty and sometimes impossibility of the construction of foundations in the winter time;

the impossibility of weak soils to create a longitudinal cavity for placement of the solid cushion, width greater than the width of the Foundation wall, without additional excavation;

it is impossible to condense the base beneath the sole Foundation that leads to an increase in the width of the Foundation pads.

Known methods of compacting soil (3 Fig.5.5 S. 69), when you get sealed base round shape, its dimensions do not exceed the size of the hole or slit.

For soil compaction use hydroclean (ed.St. N 143951, MCI, E 211 C 37(02), which includes a hydraulic cylinder with a piston rod, spacer wedge associated with the narrow end with the rod, wedge-shaped in longitudinal section of the sliding cheeks turned the oklina possible broadening of the soles of the Foundation due to soil compaction on the side surface, but not the sole Foundation, and the broadening is formed of a round shape, and not longitudinal.

The prototype of the function is a device broadening in the well [2] including shock actuator, a rod which is mounted for interaction with Widener in the form of balls interconnected, characterized in that in order to simplify the design, interacting with the balls of the lower part of the rod is provided with a tapered shape, and the Widener made of three balls interconnected by means of flexible connections. When using this device it is possible to create broadening in the well with the help of balls interconnected by flexible connections, which limit the amount of movement of the balls and the degree of compaction of the soil and do not serve for the purpose of lowering and lifting of the balls. These relationships were not able to keep the balls in the horizontal plane. With three balls cannot create broadening constant cross section throughout the length of the strip Foundation. If the area is broadening will be different, the tension in the Foundation soils under the sole Foundation will be different, it will lead to uneven precipitation of buildings and structures.

These drawbacks are eliminated in the proposed method, where trassinelli, consisting of two cylinders, the sum of the diameters of which are equal to the width of the trench, and the cylinders have along the walls of the trench.

The push elements dilator wall framing is the spacer body having in longitudinal section the shape of a wedge. The drive to push the elements extenders cylinders.

The method of expansion of the base under the bottom strip Foundation in silty-clay soils is illustrated by drawings.

In Fig. 1 shows a cross-section of the trench with its location on the bottom of the cylinder and spacer wedge; Fig.2 a cross-section of the trench after the introduction between the cylinders spacer wedge.

In trench 1 has two cylinder 2, which are connected through a flexible connection 3 with the spacer wedge 4 connected through a rod 5 with the cylinder 6.

After being pressed into the soil cylinder formed cavity 7 of compacted soil and trench 1 are filled with concrete. For the installation of foundations for the proposed method according to the layout of the foundations dug a trench at the depth location of the sole Foundation of the excavator or Baranauskas machine. Two cylinders with the help of a whole movement, for example, on a tractor or excavator. Both cylinder is lowered to the bottom of the trench by means of a power transmission on the tractor and implement a wedge between the cylinders, which are moved apart by the width of the wedge, thus forming a cavity of compacted soil. After the wedge is raised and simultaneously entrain the associated cylinders. Next, the tractor is moved by a distance equal to the length of the cylinder.

For protection of the soil from the deconsolidation of the formed cavity is filled with concrete.

The efficiency of the device tape monolithic foundations by way of a "wall" with broadening his feet in silty-clay soils is achieved by reducing construction time, since the formation of the cavity and filling it with concrete combined in time.

Due to the lack of processes of opening and filling of the sinuses foundations reduced the amount of excavation work. Due to the compaction of soil Foundation increases its load-carrying capacity, which reduces the width of the sole of the base and respectively the consumption of materials.

1. The method of expansion of the grounds under the sole of the Foundation, including the descent into mining production device for expanding the base, the push elements is broken off cavity extension elements extenders, characterized in that when the extension of the grounds of trench excavations as elements extenders use two cylinders, the sum of the diameters of which are equal to the width of the trench, and the cylinders have along the walls of the trench.

2. The method according to p. 1, characterized in that the drive to push the elements extenders cylinders.

 

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