WO2013080296A1 - 堆積厚測定装置及び堆積厚測定方法 - Google Patents
堆積厚測定装置及び堆積厚測定方法 Download PDFInfo
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- WO2013080296A1 WO2013080296A1 PCT/JP2011/077520 JP2011077520W WO2013080296A1 WO 2013080296 A1 WO2013080296 A1 WO 2013080296A1 JP 2011077520 W JP2011077520 W JP 2011077520W WO 2013080296 A1 WO2013080296 A1 WO 2013080296A1
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- float
- weight member
- slime
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
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- the present invention relates to a deposition thickness measuring apparatus and a deposition thickness measuring method for measuring the thickness dimension of a slime deposition layer in a stabilizing liquid deposited on the bottom of a drilling hole.
- Cast-in-place concrete piles are often used as foundation piles for large structures because of their strength.
- the loading support strength of the cast-in-place pile can be obtained by the frictional force and the pile bottom support force around the pile, and the depth of the pile is, for example, the depth until reaching a solid support ground with an N value of 50 or more. ing.
- the water in the borehole (stable liquid or spring water) containing the slime in the borehole is replaced with normal borehole water, and the slime deposited at the bottom of the borehole is less than the allowable amount. After removing until concrete is placed. For this reason, a technique for measuring and managing the thickness of the slime deposited on the bottom of the drilling hole is required.
- the above-mentioned stabilizing liquid is a liquid that is used in the cast-in-place pile method except for the all casing method, and is injected into the drilling hole to prevent the wall surface of the drilling hole from collapsing.
- spring pressure fresh water
- a cast-in-place pile method using a stabilizing liquid will be described as an example.
- This method utilizes the property that the stable liquid containing slime has a high density due to an increase in the proportion of slime as the depth increases as the slime settles. Specifically, when a float with a specific gravity connected to a wire is thrown into the drilling hole, the float weight sinks in the stabilizing liquid, and buoyancy and gravity at a position where the stabilizing liquid has a specific density. Will balance and stop floating. The position at which the float weight stops floating is determined by the movement resistance due to the specific gravity of the float and the viscosity of the stabilizer. Then, the depth of the float weight is measured from the amount of wire drawn when each float is suspended, and the slime deposition thickness up to the density corresponding to the float can be measured.
- the drilling holes excavated for the construction of cast-in-place concrete piles have a depth to reach the supporting ground, they may be as deep as 100 m, for example. Measuring the depth of a float weight in the range of just a few meters near the bottom of such a deep drilling hole from the measurement origin on the ground is likely to cause a large measurement error due to large measured values, resulting in low accuracy. There was a problem of becoming.
- the float-type weight is not much different from the specific gravity in comparison with the stabilizing liquid, so that it takes time to settle to the vicinity of the hole bottom, and there is also a problem that the measurement time becomes long.
- the technical problem to be solved by the present invention is to provide a deposition thickness measuring apparatus and a deposition thickness measuring method capable of measuring the thickness dimension of the deposition layer of the solid-liquid mixed phase fluid using the float with high accuracy. It is to be.
- the present invention is configured as follows.
- a weight member that is thrown into a drilling hole where water in the hole exists and is allowed to settle to the bottom of the drilling hole by gravity;
- a float that is guided so that the moving direction in the sedimented weight member is a substantially vertical direction, and maintains the specific gravity and equilibrium of the pore water that is a solid-liquid mixed phase fluid mixed with slime
- a deposition thickness measuring device that includes a displacement measuring unit that measures the vertical position of the float in the weight member, and that measures the thickness dimension of the slime deposition layer based on the position of the float.
- the positioning part that positions the weight member on the bottom of the hole so that the movement direction of the float is substantially vertical on the bottom of the hole, the suspension tension of the suspension member that suspends the weight member is continuously
- a tension measuring unit for measuring And a determination unit that determines whether the suspension tension measured by the measurement unit is within a predetermined threshold.
- the weight member reaches the bottom of the drilling hole and maintains a state in which the tension of the hanging member is constant, so that the weight member can be arranged in the drilling hole without being tilted. it can.
- the displacement measuring unit calculates a settling speed of the float, By calculating the change in fluid resistance applied to the float from the attenuation state of the float measured by the displacement measuring unit, the viscosity of the fluid existing around the float can be calculated.
- the displacement measuring unit is a magnetostrictive displacement sensor having a probe provided on the weight member and a magnet pointer provided on the float, and the probe is inserted through the cylindrical float and magnet pointer. It is preferable to arrange so as to. In this configuration, the probe is arranged below the connecting position with the suspension member so as to be coaxial with the suspension member, that is, to extend in the vertical direction with the weight member suspended. Is preferred.
- the measured properties of the solid-liquid mixed phase fluid can be displayed in real time, and the processing process can be quantitatively evaluated and judged.
- the displacement measuring unit provided on the weight member with respect to the position where the weight member stops settling is disposed at the measurement reference position. Therefore, in the evaluation of the thickness dimension of the deposited layer using the principle of float, the distance to the float that is the measurement target is short by using the place as the measurement origin of the displacement measurement unit, and it can be measured with small measured values. Therefore, the measurement error can be reduced.
- the position where the weight member stops can be adjusted by changing the ground pressure of the weight member. Specifically, the weight or shape of the weight member or the tension of the suspension member can be changed. It can be changed by adjusting the settling speed in the drilling hole.
- FIG. 1 It is a figure which shows an example of the slime property management apparatus which measures the property of the drilling hole which excavated underground for construction of a cast-in-place concrete pile, etc., and the slime and stabilization liquid in this drilling. It is an enlarged view which shows the structure of the crane of the slime property management apparatus of FIG. It is a perspective view which shows typically the structure of the deposition thickness measuring apparatus used for the slime property management apparatus of FIG. It is sectional drawing in the IV-IV line of the deposition thickness measuring apparatus of FIG. It is a bottom view of the deposition thickness measuring apparatus of FIG. It is a block diagram of the component of the slime property management apparatus of FIG. It is a graph which shows the relationship between the cable which suspends a deposition thickness measuring apparatus, and depth. It is an example of the graph which shows the example of the time-sequential change of the deposition amount produced by a slime distribution estimation means.
- the slime property management device measures the physical properties of the stable liquid containing the slime injected into the drilling hole and observes the uneven distribution of slime in the drilling hole to determine the slime distribution status. Grasping and improving the efficiency and accuracy of the replacement work between slime and stabilizing liquid in the drilling hole, stable based on measurement results to ensure higher quality slime treatment, that is, safety of cast-in-place concrete piles It is a device that manages the accumulation state of slime in the liquid.
- FIG. 1 is a diagram showing an example of a drilling hole excavated in the ground for the construction of cast-in-place concrete piles, etc., and a slime property management device for measuring the properties of slime and stabilizing liquid in the drilling hole.
- the drilling hole 1 has a predetermined hole diameter, for example, has a depth enough to reach the support ground 103, and the inner periphery of the upper end is protected by a stand pipe 104.
- the drilling hole 1 has an elongated shape that may have a diameter of several meters and a depth of as much as 100 meters.
- the slime is a mixture of sand, gravel and clay silt generated by excavating the borehole 1.
- the stabilizing liquid is a mixture of bentonite, carboxymethylcellulose (CMC), water, etc.
- the stabilizing liquid containing slime is a stabilizing liquid in which the slime, which is an excavated product generated by drilling a hole, is mixed in the liquid. It is.
- the density, specific gravity, viscosity, sand fraction, etc. of the stable liquid containing a slime can be illustrated.
- the hole 1 is filled with a stabilizing liquid 101 in order to prevent the hole wall from collapsing, and slime generated during excavation of the hole 1 is mixed and dispersed in the stabilizing liquid 101.
- the liquid settles in the stabilizing liquid 101 and deposits on the bottom of the hole.
- slime dispersed in a stable liquid contains particles of various sizes, but large particles settle faster and small particles are dispersed in the liquid phase for a long time. Therefore, the closer to the bottom of the stabilizing liquid, the larger the proportion of solid components that settles with time, and the density of the deposition layer 102 of the stabilizing liquid increases.
- FIG. 1 the boundary between the deposited layer 102 and the stabilizing solution 101 is clearly shown. However, in reality, these boundaries are not clear. In the deposited layer 102 near the bottom of the drilling hole, very fine particles are stable. It is dispersed in the liquid and is in a loose muddy state.
- the deposition thickness measuring device 3 uses the float 6 to measure the thickness of the slime deposition layer in the stable liquid.
- the pile thickness measuring device 3 is suspended by a cable 5 from a crane 2 provided outside the drilling hole 1 and is disposed in the drilling hole 1 to determine the physical properties of a stable liquid containing slime deposited on the bottom surface at the horizontal plane position. Measure in real time.
- FIG. 2 is an enlarged view showing the configuration of the crane of the slime property management apparatus of FIG.
- the crane 2 is connected to the upper end of the stand pipe 104 by a clamp 12.
- the pile thickness measuring device 3 is suspended from the tip of the beam 10 of the crane 2 to the tip of the suspension cable 5 wound around the winding winch 11.
- the suspension cable 5 is pulled out from the winding winch 11 and guided to the tip of the beam 10 by the first and second pulleys 13 and 14.
- the suspension cable 5 functions as a suspension member that suspends the deposition thickness measurement device 3, and also serves as a power cable that feeds the deposition thickness measurement device 3 and a signal cable that receives measurement information. It is a cable.
- a weight member and a wire for suspending the load of the main body of the displacement sensor 8 are also inserted into the composite cable, and the wire end of the measurement unit side wire is fastened to the inside of the main body portion 39 of the displacement sensor 8. Thus, the load on the main body 39 of the displacement sensor 8 is suspended.
- the crane 2 can move the pile thickness measuring device 3 up and down by driving the winch 11 that winds the cable 5 that suspends the pile thickness measuring device 3.
- the second pulley 14 is provided with a counter (not shown), and by measuring the feed amount of the cable 5, it is possible to measure the depth in the drilling hole of the deposition thickness measuring device 3.
- the winding winch 11 is provided with a tension measuring unit 18 (see FIG. 6) for measuring the tension of the cable 5.
- the information on the tension measured by the tension measuring unit 18 is used for processing for maintaining whether or not the deposition thickness measurement device 3 has reached the bottom surface and the posture of the deposition thickness measurement device 3 as described later.
- FIG. 3 is a perspective view schematically showing a configuration of a deposition thickness measuring apparatus used in the slime property management apparatus of FIG.
- FIG. 4 is a cross-sectional view taken along line IV-IV of the deposition thickness measuring apparatus of FIG.
- the deposition thickness measuring device 3 includes a float 6 having a predetermined specific gravity, a weight member 7 that holds the float 6 so as to be linearly movable and is connected to the cable 5, and a vertical position of the float 6.
- a displacement sensor 8 for measuring the direction distance is provided.
- the float 6 is a hollow cylindrical member having a volume of about 200 to 600 cc as shown in FIGS. 3 and 4 and has a specific gravity of about 1 to 3.
- a weight or the like may be detachably attached.
- the stability liquid in the drilling hole 1 is closer to the bottom as described above, the denser layer 102 exists and the specific gravity increases, so that the float 6 balances gravity and buoyancy at a position corresponding to the specific gravity. The balance is maintained, and the suspension is suspended by the movement resistance of the float 6.
- the float falls due to gravity, buoyancy, and fluid resistance to the float from the surrounding fluid, so that the equilibrium state is reached, and furthermore, the float stops due to loss of speed due to movement resistance when moving in the slime.
- the weight member 7 is elongated in the vertical direction and accommodates the float 6 therein.
- the weight member 7 has a predetermined weight, settles in the hole 1 and reaches the deposition layer 102, and stops penetrating into the deposition layer 102 according to the sedimentation speed and weight (see FIG. 1).
- the float 6 can move linearly within a predetermined movable range T (see FIG. 4), and within the moving range according to the specific gravity of the stable liquid in the hole 1 as described above. Stop at any position of T.
- the height direction dimension of the weight member 7 is not specifically limited, In this embodiment, it is comprised so that the movement range T of the float 6 may be set to about 1200 mm.
- the configuration of the displacement sensor 8 is not particularly limited as long as it is a device capable of measuring the position of the float 6 existing in the movement range T.
- an optical sensor or a magnetic sensor can be used.
- a magnetostrictive displacement sensor is used.
- the magnetostrictive displacement sensor is a sensor that applies a magnetostriction phenomenon due to the Wiedemann effect, and is a sensor that detects the position of a magnetic pointer that moves in a non-contact manner along a rod-shaped probe.
- the weight member 7 connects the main body lower portion 31 and the main body upper portion 32 with four support columns 33, and stores the float 6 in an area surrounded by the four support columns 33. As described above, the float 6 is guided along the support column 33 in the moving range T according to the density of the stabilizing liquid, and can move linearly.
- the plate-like main body lower portion 31 provided at the lowermost moving portion is a cross-shaped member, and other components are used to allow the deposition thickness measuring device 3 to settle stably in the stable liquid. It is comprised so that it may have a large weight compared with this member.
- the main body lower portion 31 includes a probe support portion 34 provided at the center position so as to protrude upward.
- the probe support portion 34 is configured to be inserted into the through hole 6a of the float 6 when the float 6 is at the lowest position.
- the inner wall of the float 6 contacts the probe 37 and the displacement sensor 8 is inserted. To prevent damage.
- the upper part 32 of the main body is provided on the opposite side of the lower part of the main body with respect to the float 6.
- the main body upper portion 32 includes an upper plate 35 that is connected to the support column, and a storage portion 36 that stores the displacement sensor 8 in a watertight manner and is connected to the cable 5.
- the cable 5 is connected to the central portion of the upper surface 36a of the storage unit 36, and is configured such that the posture of the deposition thickness measuring device 3 suspended by the cable 5 is substantially vertical.
- a magnetostrictive displacement sensor is used for the displacement sensor 8 stored in the storage unit 36.
- the magnetostrictive displacement sensor 8 includes a rod-shaped probe 37 and measures the position of a magnet pointer 38 that moves along the rod with the main body 39.
- the probe 37 is coaxial with the cable 5 and is disposed so as to extend in the vertical direction when the deposition thickness measuring device 3 is suspended. Further, the lower end of the probe 37 is connected to the probe support portion 34 of the lower body portion 31.
- the magnet pointer 38 is a ring-shaped member and is fixed to the upper surface of the float 6.
- the probe 37 is inserted into the magnet pointer 38.
- the absolute position of the magnet pointer 38 is detected with high accuracy by generating a torsional strain and measuring the propagation time of the strain.
- the measured position information of the magnet pointer 38 is output from the main body 39 of the magnetostrictive displacement sensor 8 to the outside of the sensor through the cable 5.
- the measurement result of the displacement sensor is output by wire, but may be wireless output.
- FIG. 6 is a block diagram of components of the slime property management apparatus of FIG.
- the slime property management device includes a deposit thickness measuring device 3, a slime property management unit 14, a property management information output unit 15, and a manual input for manually operating the crane 2.
- the tension measuring part 18 which measures the tension
- the slime property management device 100 suspends the accumulation thickness measuring device 3 from the crane 2 with the cable 5 and sinks it into the borehole 1.
- the deposition pressure measuring device 3 has a predetermined weight, and sinks in the hole 1 at a predetermined speed according to the degree of braking of the winding winch 11 that feeds the cable 5.
- the deposition thickness measuring device 3 is suspended so that the probe 37 extends in the vertical direction, and the main body lower portion 31 has a large weight, and the center of gravity exists below. Hardly sinks and sinks in the borehole 1 while maintaining the vertical direction.
- FIG. 7 is a graph showing the relationship between the depth of the deposition pressure measuring device and the tension of the cable. In addition, the depth in this graph shall show the position of the displacement sensor 8 of a deposition pressure measuring apparatus.
- the tension determination unit 19 determines, for example, that the deposition thickness measurement device 3 is fitted and stopped in the deposition layer 102 while maintaining the vertical direction at the boundary between the states II and III.
- the displacement sensor 8 whose height position from the bottom surface of the deposition pressure measurement device 3 is known is arranged at a predetermined measurement reference position. In this state, after the penetration of the deposition pressure measuring device 3 is stopped, the float 6 maintains the specific gravity and equilibrium of the stabilizing liquid and moves to a specific suspension position as described above.
- the movement of the float 6 will be described. Since the float 6 has a smaller specific gravity than the deposition pressure measuring device 3, the float 6 moves to the upper end position of the moving range T during the sedimentation of the deposition pressure measuring device 3. Then, after the insertion into the deposition layer 102 is stopped, the float 6 starts to settle. The float at this time initially has an initial velocity that is vertically downward, but then receives a fluid resistance in the float moving direction, that is, substantially vertically upward, and the float 6 performs a constant velocity falling motion. In addition, the float sedimentation behavior is similar to the liquid density, and the float shape has a large cross-sectional area in the drop direction, that is, the shape resistance coefficient at the time of fluid resistance calculation is high. Falling speed decays faster.
- This constant velocity drop motion follows Stokes' formula and decelerates according to the viscosity of the fluid around the float, so it is possible to calculate the viscosity of the fluid around the float from the time history of the float drop velocity. Become. The falling speed of the float 6 can be detected by measuring the time series with the displacement sensor 8.
- the Stokes equation is defined as follows: That is, the sedimentation rate of the sediment that freely settles in the liquid is Have the relationship.
- v s is the sedimentation velocity of the sediment
- ⁇ is the stable liquid viscosity
- r is the radius of the float 6 that is the sediment
- ⁇ f is the stable liquid density (stable liquid initial density)
- ⁇ p is the float density.
- the viscosity of the stable liquid around the float can be calculated by obtaining the speed of the constant drop motion of the float according to this equation.
- the viscosity of the stable liquid can be calculated by the slime property management means 14 described later.
- the displacement sensor 8 measures the position of the magnet pointer 38 when stopped, and outputs position information to the slime property management means 14 such as a general-purpose computer.
- the position of the displacement sensor 8 is provided at a known height with reference to the lower end of the weight member 7, and the deposition pressure measuring device 3 can be obtained by knowing the distance between the main body 39 of the displacement sensor 8 and the float 6.
- the thickness of the deposited layer corresponding to the distance from the lower end to the float 6, that is, the specific gravity of the float 6 is obtained.
- the position of the float 6 is the upper limit position of the movable range T, for example, it can be determined that slime (stable liquid) having the density of the measurement target value remains beyond the allowable amount. Then, replace the stabilizer and proceed with the removal of slime.
- the measurement can be performed by making the penetration stop position into the deposition layer of the deposition pressure measuring device 3 shallower.
- the slime property management means 14 Since the slime property management means 14 is required to obtain the depth of the deposition pressure measuring device 3 based on the amount of feeding of the cable 5, the depth of the deposited layer 102 is present at the depth position. Can be grasped. In addition, the slime property management unit 14 manages and records the results in association with time series using the measured results, and then outputs them to the property management information output unit 15 to output them to a medium such as a display or paper.
- FIG. 8 is an example of a graph showing an example of a time-series change in the accumulation amount created by the slime distribution estimation means 16.
- the slime property management device records and manages the change in the deposition amount in time series.
- the slime floating in the liquid phase before and after the slime treatment has a predetermined thickness. It can be used as a measure of the time until deposition.
- the displacement measurement unit is arranged at the measurement reference position with the penetration stop position as a reference, thereby measuring in the hole 1. Can be placed at the origin. Therefore, since the distance to the float 6 can be measured on a short scale (that is, the actual measurement value is reduced), the measurement error can be reduced. Furthermore, the viscosity of the stable liquid can also be calculated by measuring the settling velocity of the float 6 after stopping at the penetration stop position.
- this invention is not limited to the said embodiment, It can implement in another various aspect.
- a magnetostrictive displacement sensor is used as the displacement sensor, but the present invention is not limited to this, and any configuration can be used as long as the position of the float in the weight member can be measured.
- any configuration can be used as long as the position of the float in the weight member can be measured.
- not only the slime thickness measurement in the stable liquid but also the all casing method using spring water as the borehole water can be measured in the same manner.
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Abstract
Description
本発明によれば、
孔内水が存在する削孔内に投入され、重力により前記削孔の底部に沈降させられる重錘部材と、
前記沈降した重錘部材中での移動方向が略鉛直方向となるように案内され、スライムが混入する固液混相流体である孔内水の比重と平衡を保つフロートと、
前記フロートの前記重錘部材中における上下位置を測定する変位計測部とを備え、前記フロートの位置に基づいてスライム堆積層の厚み寸法を測定する堆積厚測定装置を提供する。
前記測定部により測定された吊り下げ張力が所定の閾値内であるかを判定する判定部とを備える。この構成によれば、重錘部材が削孔底に到達し、吊り下げ部材の張力一定値となるような状態を維持することで、重錘部材を傾けることなく削孔内に配置することができる。
前記変位計測部により計測された前記フロートの減衰状況から、前記フロートにかかる流体抵抗の変化を算出することで、フロート周辺に存在する流体の粘性を算出することができる。
の関係を有する。ここで、vsは沈降体の沈降速度、ηは安定液粘性、rは沈降体であるフロート6の半径、ρfは安定液密度(安定液初期密度)、ρpはフロートの密度である。この式にしたがって、フロートの等速落下運動の速度を求めることで、フロート周辺の安定液の粘性を算出することができる。安定液の粘性の演算は、後述するスライム性状管理手段14により行うことができる。
2 クレーン
3 堆積厚測定装置
4 堆積量計測部
5 ケーブル
6 フロート
7 重錘部材
8 変位センサ
10 ビーム
11 ウィンチ
12 ケーブル巻取りドラム
13 ベースフレーム部
14 スライム性状管理手段
15 性状管理情報出力手段
17 手動入力手段
18 張力測定部
19 張力判定部
31 本体下部
32 本体上部
33 支柱
34 プローブ支持部
35 上板
36 収納部
37 プローブ
38 マグネットポインタ
39 本体部
40 結束部材
100 スライム性状管理装置
101 安定液
102 堆積層
103 支持地盤
Claims (8)
- 孔内水が存在する削孔内に投入され、重力により前記削孔の底部に沈降させられる重錘部材と、
前記沈降した重錘部材中での移動方向が略鉛直方向となるように案内され、スライムが混入する固液混相流体である孔内水の比重と平衡を保つフロートと、
前記フロートの前記重錘部材中における上下位置を測定する変位計測部とを備え、前記フロートの位置に基づいてスライム堆積層の厚み寸法を測定する堆積厚測定装置。 - 前記フロートの移動方向が略鉛直方向となるように前記重錘部材を前記削孔底に位置決めする位置決め部を有し、
前記位置決め部は、前記重錘部材を吊り下げる吊り下げ部材の吊り下げ張力を連続的に測定する張力測定部と、
前記測定部により測定された吊り下げ張力が所定の閾値内であるかを判定する判定部とを備える、請求項1に記載の堆積厚測定装置。 - 前記変位計測部は、前記フロートの沈降落下速度を算出し、
前記変位計測部により計測された前記フロート速度の減衰状況から、前記フロートにかかる流体抵抗の変化を算出することで、フロート周辺に存在する流体の粘性を算出する請求項1又は2に記載の堆積厚測定装置。 - 前記変位計測部は、前記重錘部材に設けられたプローブと、前記フロートに設けられたマグネットポインタを有する磁歪式変位センサであって、前記プローブは円筒状の前記フロート及びマグネットポインタを挿通するように配置される、請求項1又は2に記載の堆積厚測定装置。
- 前記プローブは、前記吊り下げ部材との連結位置の下方に前記吊り下げ部材と同軸となるように配置されている、請求項4に記載の堆積厚測定装置。
- 前記変位計測部で計測された前記フロートとの距離の情報を時系列に記録・管理する性状管理手段と、
前記性状管理手段で記録・管理された性状情報を表示・出力する管理情報出力手段と、を備える、請求項1又は2に記載の固液混相流体の物性測定装置。 - 地中を掘削した削孔内に存在するスライムが混入する孔内水の比重と平衡を保つフロートを直線移動可能に案内する重錘部材と、前記重錘部材中における上下位置を測定する変位計測部とを備えた堆積厚測定装置を、前記削孔内に投入し、前記フロートの移動方向が略鉛直方向となるように前記重錘部材を前記削孔底の底部に沈降させ、
浮遊停止した前記フロートの前記重錘部材中での位置に基づいて、スライム堆積層の厚み寸法を測定する、堆積厚測定方法。 - 前記重錘部材を前記削孔底に沈降させる工程は、前記重錘部材を吊り下げる吊り下げ部材の吊り下げ張力を連続的に測定し、前記測定された吊り下げ張力が所定の閾値内であるかによって判定する、請求項7に記載の堆積厚測定方法。
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Cited By (5)
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JP2018135657A (ja) * | 2017-02-21 | 2018-08-30 | 株式会社安藤・間 | コンクリート杭の締固め装置およびコンクリート杭の打設管理方法 |
CN109267596A (zh) * | 2018-10-19 | 2019-01-25 | 海口经济学院 | 用于判断实际灌砼高度是否到位的测量装置和测量方法 |
JP2019085745A (ja) * | 2017-11-06 | 2019-06-06 | 鹿島建設株式会社 | 孔底状態評価装置及び孔底状態評価方法 |
US10408051B2 (en) * | 2016-07-13 | 2019-09-10 | Korea University Research And Business Foundation | Device for measuring suspension in drilling fluid and thickness of slime at the bottom of pile borehole |
JP2022148247A (ja) * | 2021-03-24 | 2022-10-06 | 関西オートメイション株式会社 | 水中にコンクリートを打設する工法におけるコンクリート打ち上がり高さ測定方法および測定装置 |
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KR101808966B1 (ko) | 2016-12-22 | 2018-01-19 | 현대건설주식회사 | 슬라임 시료 채취 기능을 포함한 공압실린더를 이용한 말뚝 굴착공 슬라임 두께 측정 장비 |
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Cited By (7)
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US10408051B2 (en) * | 2016-07-13 | 2019-09-10 | Korea University Research And Business Foundation | Device for measuring suspension in drilling fluid and thickness of slime at the bottom of pile borehole |
JP2018135657A (ja) * | 2017-02-21 | 2018-08-30 | 株式会社安藤・間 | コンクリート杭の締固め装置およびコンクリート杭の打設管理方法 |
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JP2022148247A (ja) * | 2021-03-24 | 2022-10-06 | 関西オートメイション株式会社 | 水中にコンクリートを打設する工法におけるコンクリート打ち上がり高さ測定方法および測定装置 |
JP7184266B2 (ja) | 2021-03-24 | 2022-12-06 | 関西オートメイション株式会社 | 水中にコンクリートを打設する工法におけるコンクリート打ち上がり高さ測定方法および測定装置 |
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