SU49314A1 - Method for determining internal pressure in vibrating concrete - Google Patents

Description

The proposed method of determination. The internal pressure in a vibrating concrete consists of using an air bell loaded into a concrete mix and equipped with two or one tube; occurring in a mixture of forming materials (a kineton of materials, during the vibra- tion of this mixture, the internal pressure is perceived by filling chocolol with liquid or air and its value is determined by the scale of one V13 tube or a water-based material connected to the tube. .e Fig. 1 depicts a general BI of the proposed instrument for determining the internal (Pressure and Fig. 2 is a general view of a modified instrument equipped with a water manometer. A device proposed for determining the internal pressure in a vibrating concrete consists of. The bell 7 opened at the bottom (fit-. -1), in the upper conical part of which two tubes 2 and 3 are fitted, equipped with taps. 1 and 4 liters 5, Tube 2 In addition, the lower end is equipped with a funnel b; This tube comes almost to the bottom edge - Bells / .: The upper part of the bell / is fastened with an aperture of 8, divided by ngisantimetry and mm millimeter, -ff three thick wires 9 are soldered to the edge of its tube, converging at one point. concrete at some depth with closed taps 4 and 5. After installing the bell, taps open and through the funnel C into the bell slowly pour the gens until then. until it displaces all air from the bell and is set at a certain height /., which should be approximately equal to 2.3 A ,. When concrete is vibrated, the pressure produced by it in the bell on the water will be balanced by the pressure of the water column with the height AZI which is calculated on a scale of 8. Having determined the values of Aj, L ,, finds the volume weight. If the water in the tube & x 2 and 5 does not rise when vibrating, then it shows that in the studied place concrete does not need necessary and sufficiently strong vibration. I in a modified instrument, immersed in vibri: uy | it is provided with only one tube 2, which is sunk into its upper part, which, using a tube W, is connected together with a pressure gauge 11.

Between felling 2 and tO there is a tee with a three-way running nran 72. The pressure gauge 11 is equipped with a scale of 75 divided by cm and millimeters to measure the difference Y (the water in knees H and 75 of the pressure gauge during operation.

A float 16 is placed inside the bell, which is connected with a pointer by a thin rod 77, opposite to the cat, a scale 79 is located. A float 20 is placed on the surface of the concrete, with thin rods 21 connected with the pointer 22 located opposite 2 of the scale 8 with del1.imi and the float 16, and 20, together with the gauge 19, for counting mutual, and also for a rough count of the depth of the lower part of the bell 7 immersed in the concrete mix.

The bottom of the bell is fenced with three thick wires 9, converging to a right angle and blocking the free penetration of the concrete mixture into the bell.

To determine the pressure in the vibrating concrete, the bell 7 is immersed in the concrete mixture, the depth of the lower edge of the bell in the concrete

determine the aid of the divisions applied to. scales 8, 19. When an air bell is immersed, the tee crg 72 is placed in such a position that it blocks the way for air to escape from the bell through the tee Kdi to the outside,

.so and in the manometer.

- After the bell has been submerged, the required depth of the inner cavity of the bell, using a crane 72, is communicated first with the outside air and then with the tube 10 of the water gauge.

After such installation of the triple tap, the water, when the concrete is vibrated, starts to drop in the knee 14, and in the knee 75 to rise until the water column, rising above the water level in the knee 14, is uneven. 1 bell. 7

Floats 75 and 20 should be ci; o i so that their pressure on a square centimeter of concrete is exactly the same, as a result of which they will be equally immersed in vibrated concrete. Under this condition, the distance between the lower edges of the floats, as determined by the indications of the indicators 18 and 22, is equal to the thickness of the vibrating layer producing pressure Via the air in the bell 7..

By knowing the amount of air pressure in the air bell, expressed in centimeters of the water column of the manometer and the thickness of the vibrating layer of concrete, it is possible to determine the volume weight of the concrete, k & quotient of the height of the water column by the thickness of the vibrating layer producing pressure on the air in the air bell 7

To increase the accuracy, 1 volumetric weight of concrete can be determined; water in a pressure gauge can be replaced with a lighter fluid, such as gasoline or naphtha, then the height of the liquid column will be greater and errors, possible due to inaccuracy in the reading, will decrease.

The subject of the invention.

Claims (2)

1. A method for determining the internal pressure in a vibrating concrete, characterized in that the open 7 is immersed into the concrete mass, the bell 7 is equipped with two transparent vertical tubes 2 and 5, through one of which the bell is filled with this or that liquid, in order to produce a reference by the position in the ur pipes of the liquid, partially displaced from the bell by concrete under the action of vibration forces. 2. A variation of the method according to claim 1, characterized in that instead of a tube filled with liquid, filled with liquid, a one-tube air bell is lowered into the concrete and connected via a tee with differential mans meter connected to the atmosphere.