SU1037119A1 - Bed for simulating foundations of buildings and constructions - Google Patents

Abstract

STAND FOR MODELING THE FOUNDATIONS OF BUILDINGS AND CONSTRUCTIONS, INCLUDING the frame base, the tray and the device for isolating voids in the bases, so that, in order to extend the functionality, the tray is equipped with a lid with a device for creating excess the pressure inside the tray is sealed, and the device for simulating voids in the bases is made in the form of elastic chambers installed one above the other, and a pressure tank with liquid connected by means of tubes passed through d nshae.

Description

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The invention relates to construction and can be applied to. testing models of buildings and structures erected in karst areas, mainly on cohesive soils. Known stand to simulate the deformation of the foundations of buildings and structures, including the frame and tray 1

A disadvantage of the known stand lies in the fact that on it it is impossible to create deformations in the soil in the form of craters, dips, characteristic of karst regions.

The closest in technical essence to the invention is a stand for modeling the foundations of buildings and structures, including a frame base, a tray and a device for imitation of voids in the bases, x C2.

The disadvantage of this stand is that it is intended for use only when working with a dry non-bond base, for example sand. The soil is clay, loam, etc. - it is impossible to pass through the pipe, and the stand in this case is inoperable.

The purpose of the invention is to expand the functionality of the stand.

The goal is achieved by the fact that in a stand for modeling the foundations of buildings and structures, including a frame base, a tray and a device for imitation of voids in the bases, the tray is equipped with a lid with a device for creating overpressure i not inside the tray and is sealed. the voids in the bases are made in the form of elastic chambers installed one above the other, and a pressure tank with liquid connected by means of tubes passed through the bottom of the tray.

FIG. 1 shows the stand, before testing, the general view; in fig. 2 and 3 are the same in the testing process.

The stand includes a frame 1, a tray with a lid 2, a vertical pipe 3 passed through the bottom 4 of the tray with the possibility of vertical movement, flexible chambers 5 placed one above the other in the tray and connected by means of rings 6 through which the pipe 3 passes, and the pointer 7 pipe 3, attached to the bottom 4. The tray is sealed and during operation is under pressure by connecting through the valve 8 to the vessel 9 with compressed gas. The pipe 3 is connected by means of a hose 10 having a valve 11 to a non-tank reservoir 12,

filled with liquid, and equipped with an outlet. 13. With a valve 14. The contour of chambers 5 simulates the configuration of subsurface, in particular karst-suffusion, cavities, which caused the formation of dips on the surface of the ground.

Before starting work at the stand, it is prepared. The chambers 5 at the lower position of the pipe 3, the closed valve 14 and the open 11 are filled through the hose 10 with liquid from the tank 12 to the required pressure, which is assigned depending on the stiffness properties of the base. Then the pipe 3 rises through the bottom 4 and the collar c. the upper position and the valve 11 is closed (Fig. 1). The position of the pipe 3 is controlled by the position indicator 7. At the conclusion of the preparation, the tray resting on the frame 1 is filled with the lid 2 removed with natural or artificial soil imitating the base of the buildings and structures on which the model under study is installed (shown in dotted lines), after which the harness 2 is mounted.

The work on the stand after its preparation is carried out as follows.

Through the outlet 13, with the valve 14 open, the liquid is drained from the upper chamber 5, while due to the tight coverage of the pipe 3 with the rings 3, the remaining chambers 5 remain filled. At the same time, the tray is filled with the valve 8 open with gas from vessel 9 to the design pressure. Under its own weight, as well as a part of the soil, induced by excessive pressure of the gas, above the upper chamber 5 is lowered, forming a primary dip (Fig. 2). In order to increase the size of the dip, the pipe 3 is lowered into the next position, and the next chamber 5 is emptied, while the gas overpressure in the tray is regulated (Fig. 3.) The stand design provides for testing both the bulk and the bonding bases. that the soil is not removed through the pipe, but the filling liquid chamber of sufficient size, the lowering part of the soil is moved into the emptying volume, forming a dip. On the stand, due to the presence of a number of flexible chambers, dips of various eV parameters can be implemented in succession, and their formation rate is controlled by changing the chambers emptying rate and the gas pressure in the tray.

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Claims (1)

STAND FOR MODELING THE FOUNDATIONS OF BUILDINGS AND STRUCTURES, including a frame base, a tray and a device for simulating voids in the bases, characterized in that, in order to expand the functionality, the tray is equipped with a lid with a device ^ to create excess pressure inside the tray and is sealed, and the device for simulating voids in the bases is made in the form of elastic chambers installed one on top of the other, and a pressure tank with liquid, connected by means of _: tubes passed through the bottom of the bunker. $