Borehole pressuremeter(PY-5A pre-drilling pressure gauge)

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Borehole pressuremeter(PY-5A pre-drilling pressure gauge)
PY-5A pre-drilling pressure gauge was jointly developed by Changzhou Architectural Design Institute in the late 1970s. The instrument was co-chaired by the Ministry of Construction Design Bureau a

Description

Borehole pressuremeter(PY-5A pre-drilling pressure gauge)
PY-5A pre-drilling pressure gauge was jointly developed by Changzhou Architectural Design Institute in the late 1970s. The instrument was co-chaired by the Ministry of Construction Design Bureau and Jiangsu Provincial Construction Bureau in July 1980. Technical appraisal, through decades of on-site practical experience, combined with the advantages of foreign advanced pre-drilling pressure gauges, our factory has continuously improved the PY-5A pre-drilling pressure gauge, which has greatly improved the performance of the instrument and is reliable. Higher sex, simpler operation and wider use.
For many years, the PY-5A pre-drilling pressure gauge has been widely used in various key projects in the country. The test data obtained has been recognized by many geotechnical experts, professors and surveying experts in China, and the pressure test technology. Made a full affirmation. The Ministry of Construction, the Ministry of Water and Electricity, the Ministry of Railways, and the Non-Ferrous Metals Industry Association have successively formulated national and ministerial-level pressure test procedures according to the PY type pressure gauges of our factory

1. The high-precision and non-gas-consuming pressure regulating valve makes the pressurization process more precise, stable and intuitive, thus ensuring the accuracy of the test data.
2. The unique water circulation system design greatly accelerates the water injection and return water process of the pressure divider, greatly shortens the test time, improves the working efficiency, and effectively improves the control precision of the water volume of the instrument.
3. The pressure regulator adopts a three-chamber structure consisting of a measuring medium cavity and two protective chambers. The function of the protection cavity is to extend the length of the test layer of the hole wall; support the expansion of the measurement cavity, reduce the influence of the end of the measurement cavity, and make the measurement cavity generate uniform pressure on the hole wall, thereby simplifying the complex spatial strain to Approximate plane strain state. Moreover, the three-chamber pressure reducer has a uniform pressure throughout the entire length, and can effectively measure the actual pressure of the middle cavity, and the operation of filling and degassing is relatively simple.
4. The new generation AP type pressure regulator adopts a new design. Compared with the previous generation AP type pressure regulator, the soil layer is wider, and the damage probability of the elastic film is small. When using this type of pressure divider test, after the test is over, Just press the pressure regulating valve and the water in the pressure regulator will quickly return to the measuring tube. When the pressure is near the zero position, the pressure regulator can be lifted, so that when the next point is tested, There is no need to refill the water, which shortens the preparation time of the next test point and greatly improves the efficiency of the site.
5. The catheter adopts a custom 3-color multi-beam tube. The inner tube is made of imported PA-11 fiber (high-pressure resistant material). It has the advantages of high pressure resistance, small volume change, and low temperature resistance. The outer skin is polyurethane. Wear and shock resistance. The pipe connection is connected by a ferrule seal, which is easy to install and has good sealing.
6. Cooperate with the special hole-forming composite drilling tool for the side pressure test developed by our factory, which can greatly improve the inconvenience of the hole pressure test into the hole. The composite drill has a reamer and a test hole formed into a hole drill. The guide hole and the test hole can be completed in one drilling, which can improve the drilling efficiency and avoid the disturbance of the hole wall by repeated lifting, improve the quality of the hole and ensure the test data. Accuracy

SN.	Name		Parameter
			PY-3 type	PY-4 type	PY-5 type		PY-5A
1	Pressure regulator	Structure type	Three
		Nominal outer diameter	60mm				74mm
		Measuring chamber length	250mm				210mm
		Total pressure of the pressure regulator	800mm				850mm
2	Measurement accuracy	Pressure gauge minimum reading	0.005Mpa			0.01Mpa
		Measuring effective range	400mm
		Full error	=< +/-1%
3	Other	Maximum test pressure	2.5Mpa	4.0Mpa	5.5Mpa
		Host size	830×360×220mm
		Host weight	28kg
		Application range	Cohesive soil, silty soil and other strata	Hard cohesive soil, silty soil, sand and other strata	Clay, silty soil, sand, strong weathered rock, soft rock and other strata

Applicable standard：
JGJ 69-90　 PY type pre-drilling side pressure test procedure
YSJ224-91　 Pre-drilling side pressure test procedure
YBJ23-91　 Pre-drilling side pressure test procedure
BKB03-93　 Engineering geology in situ test procedure
TB10046-96 Railway engineering ground pressure test procedure
GB50021-2000　 Geotechnical survey specification