KR20170037036A - Automatic measurement apparatus for standard penetration tester - Google Patents

Automatic measurement apparatus for standard penetration tester Download PDF

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Publication number
KR20170037036A
KR20170037036A KR1020150136086A KR20150136086A KR20170037036A KR 20170037036 A KR20170037036 A KR 20170037036A KR 1020150136086 A KR1020150136086 A KR 1020150136086A KR 20150136086 A KR20150136086 A KR 20150136086A KR 20170037036 A KR20170037036 A KR 20170037036A
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KR
South Korea
Prior art keywords
roller
casing
standard penetration
automatic measuring
penetration tester
Prior art date
Application number
KR1020150136086A
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Korean (ko)
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KR101751013B1 (en
Inventor
이병석
유인택
Original Assignee
전북대학교산학협력단
(주)다일엔지니어링
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Priority to KR1020150136086A priority Critical patent/KR101751013B1/en
Publication of KR20170037036A publication Critical patent/KR20170037036A/en
Application granted granted Critical
Publication of KR101751013B1 publication Critical patent/KR101751013B1/en

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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D1/00—Investigation of foundation soil in situ
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D1/00—Investigation of foundation soil in situ
    • E02D1/02—Investigation of foundation soil in situ before construction work
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D1/00—Investigation of foundation soil in situ
    • E02D1/02—Investigation of foundation soil in situ before construction work
    • E02D1/022—Investigation of foundation soil in situ before construction work by investigating mechanical properties of the soil
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/40—Investigating hardness or rebound hardness
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2600/00—Miscellaneous
    • E02D2600/10—Miscellaneous comprising sensor means

Abstract

The automatic measuring apparatus for a standard penetration tester according to the present invention includes a casing fixing frame 110 through which a hollow casing 1 is inserted through the inside thereof; A support plate 120 disposed along the outer periphery of the casing fixing frame 110; A roller fixing part 130 fixedly coupled to the upper surface of the support plate 120; A roller module 140 slidably coupled to the upper portion of the support plate 120; And an encoder 150 coupled to the roller module 140 so that the roller fixing part 130 can detect the displacement of the rod 3 inserted into the casing 1 in accordance with the upward and downward movement, Through the encoder 150.

Description

[0001] The present invention relates to an automatic measurement apparatus for a standard penetration tester,

The present invention relates to an automatic measuring device for a standard penetration tester. More particularly, the present invention relates to an automatic measuring device for a standard penetration tester, which enables a smooth measurement regardless of a test environment by using a method of measuring a change in length of a rod through a roller driven in conjunction with a rod moving up and down through a borehole .

In general, in order to carry out various civil engineering works and construction work, first of all, the ground survey is conducted on the relevant area, and the consistency and relative density of the ground according to the soil are determined, State, and constituent components. As a method for this, a standard penetration test is usually used.

A standard penetration test (SPT) was conducted by repeating a split barrel sampler (hereinafter abbreviated as "sampler") inserted into a borehole by freely dropping a 63.5 kg hammer at a height of 75 cm, 30 ㎝ is the number of impacts required to penetrate and N is a representative ground survey method that estimates the soil strength such as the strength of the soil, the relative density of the soil, and the internal friction angle from the measured N value.

The standard penetration test is a test to measure the soil resistance by placing a cylindrical sampler called a split spoon into the borehole and applying impact with the same energy. Among the methods of investigating the soil properties, Is a part of sounding which is used to investigate the soil characteristics by inserting a resistor attached to the soil into the soil and measuring the resistance at the time of penetration, rotation, and drawing, and there are cone penetration test and vane test.

In this case, the N value when the sampler intrudes the first 15 cm is regarded as a preliminary rider judging that the sample is disturbed, and the number of hitting of the hammer according to the subsequent 30 cm penetration amount is set to N value. If the number of strokes exceeds 50, the penetration depth at 50 strokes is measured. This standard penetration test is conducted every 1.5 m under the local table or whenever the strata are changed. In principle, however, when the same strata continue, one stratum is completed at that stratum.

On the other hand, in the conventional standard penetration test, there is a problem in that the measuring device is based on the measurement by the observer or the experimenter, and there are some inaccuracies on the calculation of the number of impacts and the reading of the intrusion depth. And it is required to improve accuracy and reliability by accurate penetration depth.

As a conventional document which proposes a standard intrusion test automatic measuring apparatus, refer to Published Patent No. 10-2014-0131031 (Nov. The document is based on a standard penetration test with a program to automatically measure penetration up to the reference penetration depth and the number of hits and to control the equipment so that the field data obtained can be transferred to the office's computer equipment to process necessary data However, since it is necessary to dispose of a standard penetration tester which is used in the case of introducing new equipment, it is required that the ground survey company is mainly a small company There is a limitation that the economic burden is too great.

(Patent Document 1) KR 10-2014-0131031 A

SUMMARY OF THE INVENTION [0006] The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a method of measuring a length change amount through the number of rotations of a roller that drives a penetration length and a recovery length of a rod, The present invention provides an automatic measuring device for a standard penetration tester.

In order to accomplish the above object, the automatic measuring apparatus for a standard penetration tester according to the present invention includes a casing fixing frame 110 through which a hollow casing 1 is inserted through the inside thereof; A support plate 120 disposed along the outer periphery of the casing fixing frame 110; A roller fixing part 130 fixedly coupled to the upper surface of the support plate 120; A roller module 140 slidably coupled to the upper portion of the support plate 120; And an encoder 150 coupled to the roller module 140 so that the roller fixing part 130 can detect the displacement of the rod 3 inserted into the casing 1 in accordance with the upward and downward movement, Through the encoder 150.

A plurality of the roller fixing portions 130 are radially arranged around the casing 1.

The roller fixing part 130 includes a fixing bar 131 disposed on the upper surface of the supporting plate 120 and a distance adjusting bolt 132 And a sliding bar 133 fixed to one side of the distance adjusting bolt 132 in a state of being spaced forward from the fixing bar 131.

The roller fixing part 130 further includes an elastic body 134 having both ends fixed to the roller module 140 and the sliding bar 133.

The roller module 140 includes a roller 141 which can be brought into close contact with the outer circumferential surface of the rod 3 inserted into the casing 1, a roller shaft 142 passing through the center of the roller 141, And a roller plate 145 disposed at the lower ends of the bearing blocks 143 and 144. The bearing blocks 143 and 144 are disposed on both sides of the bearing blocks 143 and 144, respectively.

A pair of sliding guides 122 are disposed on the support plate 120 so as to face each other.

The roller plate 145 moves along the radial direction of the casing 1 with both side ends thereof being slidably inserted into the sliding guide 122.

As described above, the automatic measuring apparatus for the standard penetration tester according to the present invention minimizes errors and arbitrary judgments generated by the manual operator's measurement of the standard penetration tester, which is most commonly used for the civil ground survey, Ensure reliability.

The automatic measuring device for the standard penetration tester according to the present invention can easily attach and remove to a conventional tester, thereby improving the efficiency of the test at low cost and adopting the measuring method using the roller, thereby ensuring accurate operation and durability even in a poor work environment.

In addition, by developing a management system that combines a small notebook and a data logger, we measure and record in real time in the field to solve the problem of reliability and reproducibility of the test results according to the skill of the field tester and arbitrary judgment.

In addition, it can be used in the field without the big economic burden by using the existing tester without structural modification compared with the expensive automatic tester developed at home and abroad.

In addition, it is possible to measure precise test values in self weight and soft ground, so it is possible to repeatedly examine the standard penetration test value, which was not possible in the past when applying the automatic measurement system from soft ground, By applying to the design, a safe and economical design can be achieved.

In Korea, standard penetration test is generally used for ground survey regardless of sandy ground and soft clay ground. Most civil engineering and architectural designs are made using these test results, and automatic measurement system according to the present invention is applied It is possible to measure settlement speed, length, penetration length due to one stroke, and so on, so that it is possible to develop a more precise soil intensification conversion equation for the soft clay layer.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a general conceptual diagram of an automatic measuring apparatus for a standard penetration tester according to an embodiment of the present invention. FIG.
2 is a perspective view of an automatic measuring apparatus for a standard penetration tester according to an embodiment of the present invention.
3 is a view showing a state in which an automatic measuring apparatus for a standard penetration tester is installed on a casing and a rod.
Fig. 4 is a plan view of Fig. 2. Fig.
Fig. 5 is a bottom view of Fig. 2. Fig.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood, however, that the invention is not limited to the disclosed embodiments, but is capable of other various forms of implementation, and that these embodiments are provided so that this disclosure will be thorough and complete, It is provided to let you know completely. Wherein like reference numerals refer to like elements throughout.

It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals even though they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; may be "connected," "coupled," or "connected. &Quot;

Hereinafter, an automatic measuring apparatus for a standard penetration tester according to the present invention will be described with reference to FIGS. 1 to 5. FIG.

The present invention relates to a method of measuring the resistance of a soil by applying a blow through a rod (3) on a cylindrical sampler (5) called a split spoon inserted in a casing (1) do. Here, the penetration length and the recovery length of the rod 5 through the casing 1 are converted into length by the roller module 140 constituting the automatic measuring apparatus 100 to measure the length change amount By using this method, the measurement can be smoothly performed even in a poor test environment.

The automatic measuring apparatus 100 for a standard penetration tester includes a casing fixing frame 110 having a through hole formed in the upper and lower surfaces thereof such that the casing 1 is penetratedly coupled to the casing fixing frame 110, a support plate 120 fixedly coupled to the casing fixing frame 110, A roller fixing part 130 fixed to the upper surface of the plate 120, a roller module 140 slidably coupled to the upper part of the support plate 120, and an encoder 150 coupled to the roller module 140 .

The casing fixing frame 110 has a shape that surrounds the upper end of the casing 1 fixedly installed on the ground. For this purpose, the casing fixing frame 110 is formed with a through- Holes are formed. A casing fixing bolt 112 is inserted through the casing fixing frame 110 in a radial direction from the outer circumferential surface thereof. The casing fixing bolt 112 is movable in the radial direction of the casing fixing frame 110 in a screw-type manner, and is fixed to the casing fixing frame 110 in such a manner that the outer circumferential surface of the casing 1 is press- . Meanwhile, the casing fixing bolts 112 may have a structure in which a plurality of casing fixing bolts 112 are arranged radially with respect to the center of the casing fixing frame 110.

A plurality of support plates 120 are disposed at regular intervals along the upper side of the casing fixing frame 110 to stably support the roller fixing part 130 and the roller module 140. The support plate 120 may have a structure in which a plurality of support plates 120 are disposed radially with respect to the center of the casing fixing frame 110.

On the support plate 120, a pair of sliding guides 122 are arranged to face each other. A pair of sliding guides 122 are fixed on both upper ends of the support plate 120 through the guide fixing bolts 124. The roller module 140 is movable between the pair of sliding guides 122 and can be moved toward or away from the rod 3 inserted into the casing 1.

The roller fixing unit 130 includes a fixing bar 131 disposed at the outer end of the upper surface of the support plate 120, a distance adjusting bolt 132 adjustably coupled to the fixing bar 131 in the forward and backward directions, A sliding bar 133 fixed to one end of the distance adjusting bolt 132 in a state of being spaced forward from the fixing bar 131 and an elastic body 133 having both ends fixed to the roller module 140 and the sliding bar 133 134).

The sliding bar 133 can be moved along the radial direction of the casing 1 through the process of adjusting the distance adjusting bolt 132. In this case, It has a shock-absorbing function or a shock-absorbing function for appropriately controlling the pressure.

The roller module 140 includes a roller 141, a roller shaft 142 passing the center of the roller 141, a first bearing block 143 disposed on one side of the roller shaft 142, And a roller plate 145 disposed at the lower end of the first and second bearing blocks 143 and 144. [

The roller plate 145 is movable along the radial direction of the casing 1 with both side ends thereof being slidably inserted into the inside of the sliding guide 122 on the support plate 120, The sliding bar 133 and the elastic body 134 are brought close to each other on the rod 3 to be inserted into the casing 1 with appropriate pressure.

The encoder 150 senses the rotational speed and the rotational speed in accordance with the forward or reverse rotation of the roller 141 in the roller module 140, and outputs the digital relative value. That is, when the forward or reverse rotation of the portion of the roller 141 which is closely driven on the outer circumferential surface of the rod 3 is started according to the impact on the rod 3, the encoder 150 senses the output signal value, The sensed value is transferred to the ADC board and the forward or reverse rotation is judged with the transferred value.

For example, assuming that the output of the A-phase and the B-phase is 90 degrees out of phase with the output signal value, if the A-phase is 90 degrees ahead of the B-phase, If it is the opposite, it is judged as reverse rotation. In addition, one period can be obtained through a constant rotation angle and can be calculated in one rotation.

The operation is performed to interlock with the SD module 10, and at the same time, data is stored in the SD module 10 in real time, thereby performing data logging.

Data processed through the SD module 10 and the add-on board is sent to the monitoring device 20 through serial communication, and information such as time, number of revolutions, cumulative depth, and cumulative number of revolutions can be confirmed.

As described above, according to the automatic measuring apparatus for a standard penetration tester according to the present invention, the penetration length and the recovery length of the rod 3 through the casing 1 are controlled by the number of rotations of the roller for driving the rod 3 in conjunction with the rod 3, This method makes it possible to perform a smooth measurement in any test environment.

It is to be understood that the terms "comprises", "comprising", or "having" as used in the foregoing description mean that the constituent element can be implanted unless specifically stated to the contrary, But should be construed as further including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (7)

A casing fixing frame 110 through which a hollow casing 1 is inserted and inserted;
A support plate 120 disposed along the outer periphery of the casing fixing frame 110;
A roller fixing part 130 fixedly coupled to the upper surface of the support plate 120;
A roller module 140 slidably coupled to the upper portion of the support plate 120; And
And an encoder (150) coupled to the roller module (140)
The roller fixing part 130 detects a displacement of the rod 3 inserted into the casing 1 in accordance with the upward and downward movement through the encoder 150.
Automatic measuring device for standard penetration tester.

The method according to claim 1,
The plurality of roller fixing portions 130 are radially arranged around the casing 1,
Automatic measuring device for standard penetration tester.
3. The method of claim 2,
The roller fixing part (130)
A fixing bar 131 disposed on the upper surface of the supporting plate 120, a distance adjusting bolt 132 adjustably screwed in the longitudinal direction of the fixing bar 131, And a sliding bar (133) fixed to one end of the distance adjusting bolt (132) while being spaced apart forward.
Automatic measuring device for standard penetration tester.
The method of claim 3,
The roller fixing part (130)
Further comprising an elastic body (134) having both ends fixed to the roller module (140) and the sliding bar (133)
Automatic measuring device for standard penetration tester.
The method according to claim 1,
The roller module (140)
A roller 141 which is in contact with the outer circumferential surface of the rod 3 inserted into the casing 1, a roller shaft 142 which passes the center of the roller 141, a bearing block 142 which is disposed on both sides of the roller shaft 142, (143, 144) and a roller plate (145) disposed at the lower end of the bearing block (143, 144)
Automatic measuring device for standard penetration tester.
6. The method of claim 5,
On the support plate 120, a pair of sliding guides 122 are arranged to face each other,
Automatic measuring device for standard penetration tester.
The method according to claim 6,
The roller plate 145 moves along the radial direction of the casing 1 in a state in which both side ends are slidably inserted into the sliding guide 122,
Automatic measuring device for standard penetration tester.
KR1020150136086A 2015-09-25 2015-09-25 Automatic measurement apparatus for standard penetration tester KR101751013B1 (en)

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Application Number Priority Date Filing Date Title
KR1020150136086A KR101751013B1 (en) 2015-09-25 2015-09-25 Automatic measurement apparatus for standard penetration tester

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KR20170037036A true KR20170037036A (en) 2017-04-04
KR101751013B1 KR101751013B1 (en) 2017-06-26

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20210143533A (en) * 2020-05-20 2021-11-29 (주)지오뱅크 Ground standard penetration tester that easy to assemble on field
CN115506779A (en) * 2022-11-09 2022-12-23 中交第四航务工程勘察设计院有限公司 Four-wheel extrusion drive injection device and injection method

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KR102332518B1 (en) 2021-02-08 2021-12-01 채휘영 Apparatus for Automatic Measuring of Standard Penetration Test and Driving Method Thereof

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Publication number Priority date Publication date Assignee Title
KR101087161B1 (en) * 2011-02-16 2011-11-25 (주)삼일이엔씨 Guide apparatus for adaptively drilling in various figures and conditions of ground
JP5326177B2 (en) 2011-12-09 2013-10-30 株式会社フジタ Portable cone penetration test equipment

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20210143533A (en) * 2020-05-20 2021-11-29 (주)지오뱅크 Ground standard penetration tester that easy to assemble on field
CN115506779A (en) * 2022-11-09 2022-12-23 中交第四航务工程勘察设计院有限公司 Four-wheel extrusion drive injection device and injection method
CN115506779B (en) * 2022-11-09 2023-03-10 中交第四航务工程勘察设计院有限公司 Four-wheel extrusion drive injection device and injection method

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