CN208203257U - It is a kind of for improve in drilling hole test precision steel plate structure - Google Patents
It is a kind of for improve in drilling hole test precision steel plate structure Download PDFInfo
- Publication number
- CN208203257U CN208203257U CN201820557943.8U CN201820557943U CN208203257U CN 208203257 U CN208203257 U CN 208203257U CN 201820557943 U CN201820557943 U CN 201820557943U CN 208203257 U CN208203257 U CN 208203257U
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- steel plate
- circular
- diameter
- circular steel
- hole
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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The utility model discloses a kind of for improving the steel plate structure for testing precision in drilling hole, including circular steel plate, the specification of the circular steel plate are as follows: diameter 30-50cm, thickness 1-3cm, the circular hole that diameter is 5.5cm is arranged in circular steel plate center, the steel plate edge of circular steel plate, which is uniformly spaced, is arranged 3 anchoring circular holes, and the diameter for being anchored circular hole is 1.5-2cm.The utility model proposes a kind of circular steel plate structure, it is easy to carry, by the operative constraint of circular steel plate central small hole diameter, substantially reduce feeler lever amplitude of fluctuation, guarantee weight as far as possible along guide rod vertical drop, improve the precision of test.
Description
Technical field
The utility model relates to a kind of for improving the steel plate structure for testing precision in drilling hole, be particularly suitable for engineering
Heavy dynamic penetration and standard penetration test (SPT) in geological drilling hole.
Background technique
In order to meet engineering geological investigation requirement, it is often necessary to carry out heavy dynamic penetration test in the borehole or standard is passed through
Enter test.
Heavy dynamic penetration test is using certain hammering energy (hammer weight 63.5kg into shape and fall away from 76cm), by a scale
Very little, certain shapes probe is squeezed into soil, and a kind of home position testing method of soil layer property is determined according to the complexity squeezed into.Such as
Probe is changed to standard penetrometer, then referred to as standard penetration test (SPT).
Domestic heavy dynamic penetration test and standard penetration test (SPT) feeler lever diameter are 42mm, feeler lever bottom end connection probe or mark
Quasi- penetrator, top connect guide rod.In order to guarantee the precision of dynamic penetration test and standard penetration test (SPT) result, testing
In the process, the verticality that should remain guide rod, feeler lever makes weight along guide rod vertical drop, is in movement of falling object shape
State.
During actually prospecting, since drilling orifice is relatively large in diameter (generally higher than 110mm), and feeler lever diameter is relatively
Small (25-50mm), gap is larger between feeler lever and borehole wall, and feeler lever will generate the pendulum of certain amplitude in aperture when test
It is dynamic so that guide rod pendulum is secondary bigger, cause weight can not vertical drop (non-free falling state), to influence test knot
Fruit causes actual measurement blow counts higher, substantially reduces test precision.
The purpose of this utility model is to provide a kind of for improving the steel plate structure for testing precision in drilling hole, can
The amplitude of fluctuation for reducing feeler lever makes weight along guide rod vertical drop as far as possible, and then improves the precision of test.
Summary of the invention
The purpose of this utility model is to provide a kind of for improving the steel plate structure for testing precision in drilling hole, can
The amplitude of fluctuation for reducing feeler lever makes weight along guide rod vertical drop as far as possible, and then improves the precision of test.
The purpose of this utility model is achieved in that a kind of for improving the steel plate knot for testing precision in drilling hole
Structure, including circular steel plate, the specification of the circular steel plate are as follows: diameter 30-50cm, thickness 1-3cm, circular steel plate center are arranged directly
Diameter is the circular hole of 5.5cm, and the steel plate edge of circular steel plate, which is uniformly spaced, is arranged 3 anchoring circular holes, is anchored the diameter of circular hole
For 1.5-2cm.
In order to reduce the amplitude of fluctuation of feeler lever, need to place one piece of circular steel plate in drilling orifice bottom surface.The utility model
It is proposed a kind of circular steel plate structure, the structure is during hole internally-powered feeler inspection or standard penetration test (SPT), by circular steel plate
The operative constraint of heart small-bore plays the role of " righting " to feeler lever, reduces the amplitude of fluctuation of feeler lever to the maximum extent, make weight
Along guide rod vertical drop, achievees the purpose that the precision for improving test, so that test result is accurately reflected stratum really special
Sign.
Detailed description of the invention
The utility model is described in further detail below in conjunction with attached drawing.
Fig. 1 is the schematic perspective view of the utility model；
Fig. 2 is the usage state diagram of the utility model.
Specific embodiment
It is a kind of for improving the steel plate structure for testing precision in drilling hole, as shown in Figure 1 and Figure 2, including circular steel plate 1,
The specification of the circular steel plate 1 are as follows: the circle that diameter is 5.5cm is arranged in diameter 30-50cm, thickness 1-3cm, 1 center of circular steel plate
Hole 2, the steel plate edge of circular steel plate 1, which is uniformly spaced, is arranged 3 anchoring circular holes 3, and the diameter of anchoring circular hole 3 is 1.5-2cm.
In order to consolidate steel plate during the test, drill rod 4 is passed through into anchoring circular hole 3 before test, squeezes into soil layer, anchor is played to steel plate 1
Gu effect.
Before test is surveyed, first feeler lever 5 and dynamic probe or standard penetration device are connected, and is vertically arranged in drilling, then will be justified
Shape steel plate 1 is inserted in from 5 top of feeler lever, and is laid in aperture ground, is anchored backplate with drill rod 4.
The utility model circular steel plate structure is suitable for heavy dynamic penetration and Standard piercing examination in engineering geological drilling hole
It tests, suitable for being tested in the engineering geological drilling hole of different pore size aperture, is suitable in every profession and trade engineering geological investigation drilling hole
Test.
If the diameter of steel plate center hole is changed to 3.5cm, it is applicable to portable dynamic penetration test；If by steel plate
The diameter of center hole is changed to 7.0cm, is applicable to extra-heavy duty type dynamic penetration test.
Circular steel plate structure is not easy abrasion damage in use, can be used for a long time.Usually it should be noted that antirust, anti-corrosion
Erosion.
Claims (1)
1. it is a kind of for improving the steel plate structure for testing precision in drilling hole, including circular steel plate, it is characterized in that: the circular steel
The specification of plate are as follows: the circular hole that diameter is 5.5cm, circular steel plate is arranged in diameter 30-50cm, thickness 1-3cm, circular steel plate center
Steel plate edge be uniformly spaced 3 anchoring circular holes be set, the diameter for being anchored circular hole is 1.5-2cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820557943.8U CN208203257U (en) | 2018-04-19 | 2018-04-19 | It is a kind of for improve in drilling hole test precision steel plate structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820557943.8U CN208203257U (en) | 2018-04-19 | 2018-04-19 | It is a kind of for improve in drilling hole test precision steel plate structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208203257U true CN208203257U (en) | 2018-12-07 |
Family
ID=64524746
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820557943.8U Active CN208203257U (en) | 2018-04-19 | 2018-04-19 | It is a kind of for improve in drilling hole test precision steel plate structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208203257U (en) |
-
2018
- 2018-04-19 CN CN201820557943.8U patent/CN208203257U/en active Active
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