Rock mass rigid pressure plate testing instrument

HTCY-20Rock mass rigid pressure plate testing instrument

1、 Product Introduction:

Rock tests for water conservancy and hydropower projects should include tests on the physical and mechanical properties of rock blocks, rock deformation tests, rock strength tests, rock creep tests, and rock stress tests. Rock acoustic testing and engineering rock mass observation, etc.

Rock testing should be conducted based on an understanding of the engineering geological conditions, hub layout plan, design intent, direction and magnitude of engineering loads, building characteristics, and construction methods. The rock test items, test methods, test quantities, etc. should be consistent withThe depth of each survey and design stage required by GB 50487 should be adapted accordingly. This equipment is produced based on the rigid pressure plate method test in SL/T264-2020 and fully meets the testing requirements.

2、 Main technical parameters

1. Load plate diameter: 505mm (2000 ㎠) ф 565mm (2500 ㎠)

2. Jack loading capacity range: 0-50T

3. Jack stroke: 150mm

4. Side bridge span: 3000mm

5. Pressure testing range: 0-60MPa

6. Displacement testing range: 0-10mm

3、 Basic Structure

This instrument consists of a loading system, side beams, etc.

1. Loading system: composed of hydraulic jack, circular rigid pressure plate, hydraulic pump and pipeline, pressure gauge, transmission column, and cushion plate. The top position line for placing the jack is engraved on the load plate

2. Side bridge: composed of supports, gauge brackets, deformation gauges, and magnetic gauge seats. The crossbeam can be raised and lowered along two support columns to adjust its height

4 Installation preparation work

1The surface of the pilot rock mass should be cleaned, a layer of cement slurry should be laid, a rigid pressure plate should be placed, the pressure plate should be lightly tapped, and excess cement slurry should be squeezed out to make the pressure plate parallel to the surface of the pilot. The thickness of cement slurry should not be greater than the diameter or side length of the pressure plate1%And should prevent the formation of bubbles in the cement slurry.

2A jack should be placed on the pressure plate, and the pressure center of the jack should coincide with the center of the pressure plate.

3A cushion plate, a force transmission column, and a cushion plate should be installed on the jack in sequence, and mortar should be filled or a reaction device should be installed between the cushion plate and the back seat rock mass.

4When it is not possible to use the roof of the cave as a reaction force in an open field or when it is not possible to use it as a reaction force location, the pile cutting method or ground anchor can be used as a reaction force device.

5After installation, the jack can be started to apply a little pressure to make the entire system tightly integrated.

6The pressurization system should have sufficient strength and rigidity, and the centers of all components should be kept on the same axis and consistent with the pressurization direction.

5The installation of deformation measurement system shall comply with the following regulations:

1. Gauge brackets should be placed on both sides of the pressure plate1The root and gauge bracket should meet the stiffness requirements, and the support form should be simple support. The fulcrum of the bracket should be set at a distance from the center of the pressure plate or hydraulic pillow2.0Beyond the diameter or edge length.

2. The deformation gauge should be installed on the gauge bracket through a magnetic gauge holder. The rigid pressure plate method test should be symmetrically arranged on the pressure plate4A measuring table.

3. According to the needs, several measuring instruments can be symmetrically arranged on two perpendicular axes at the center of the bearing plate within the influence range of the pilot outside the bearing plate.

Note: The cement slurry and concrete poured during installation should be cured

VIThe testing and stability standards should meet the following requirements:

1. Test: The maximum pressure should not be less than the predetermined pressure1.2Twice. Pressure should be divided into5Grade should be applied in equal parts according to the maximum pressure.

2. Before applying pressure, an initial stable reading observation should be conducted on the measuring instrument, and every10minSimultaneously read each meter once, and if the readings remain unchanged for three consecutive times, the pressure test can begin, and this reading should be used as the initial reading value for each meter.

3. The pressurization method should adopt a step-by-step one cycle method. According to the needs, the step-by-step multiple cycle method or the large cycle method can be used.

4. After each level of pressure is increased, readings should be taken immediately, and thereafter every10minAt the same time, measure the readings once. When all the gauges on the rigid pressure plate have a difference between adjacent readings of the same level of pressure * one deformation reading and the difference between the readings of the previous level of pressure * the next deformation reading, the ratio is less than5%At this time, it can be considered that the deformation is stable and pressure relief should be carried out. The stability standard after decompression should be the same as the stability standard during pressurization. After stabilizing the pressure, the test can be ended by sequentially increasing the pressure to the maximum pressure according to the above steps.

5. During the process of pressurization and depressurization, the corresponding process pressure should be measured and the gauge reading should be taken once.

6. The measuring points of the axial displacement meter for drilling and the external measuring meter for the plate can be read after the reading is stable.

HTCY-20Rock mass rigid pressure plate testing instrument