JP2007277940A - Method and device for determining ground and cracking used when boring is performed by hydraulic down-the-hole hammer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and a device for determining a ground and cracking when boring is performed by a hydraulic down-the-hole hammer which can develop the advantages of the boring by using the hydraulic down-the-hole hammer in which a ground is bored by hydraulically producing a hammering energy just above a bit, and accurately determining the states of the geology, weathering, and deterioration by detecting the hardness, hollow, and cracking of the ground under the environmental conditions in which very deep boring, boring under an underground water level, and the occurrence of noise are restricted and displaying the results in real time. <P>SOLUTION: This device comprises three mechanisms having a drilling parameter record part, an analysis/ground condition determination part, and a result display part. The drilling parameter record part having a measurement device mounted on a hydraulic down-the-hole hammer boring machine and/or its auxiliary devices collects, during the drilling, the values of a feeding force, a torque, a drilling speed, a water feed rate, and a water feed pressure which are drilling parameters. The ground condition determination part evaluates the ground by using exclusive determination expressions/evaluation indexes. The result display part displays them in real time. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention is a hydraulic down-the-hole that determines the geology, weathering deterioration status, etc. in real time while grasping the ground conditions (hardness / softness, presence / absence / location of cracks, etc.) while excavating with a hydraulic down-the-hole hammer type boring machine. The present invention relates to a ground determination and crack determination method and apparatus when drilling a hole with a hammer.

  In recent years, underground use often extends to a large depth, and a method for efficiently drilling a borehole to the deep underground has been required for investigation, construction, or subsequent monitoring.

  Furthermore, when excavating in urban and mountainous conditions, the noise often becomes a problem, so a method with less noise has been demanded.

  As another requirement, a method for quickly grasping the ground condition by a method as simple as possible has been required from the viewpoint of efficiency of construction and cost reduction. In particular, in deep boring, economy and speed are often the main issues.

  Core sampling and borehole scanner observation are methods for grasping geological conditions using boreholes. Although both methods are high in accuracy of grasping the ground condition, it takes time and much cost. For example, when there are many bore holes, it is not practical to use this method for all holes.

On the other hand, as in the following patent document, exploration technology has been developed that collects drilling data and estimates the ground condition based on that data when drilling holes. The index for estimating the ground from the data obtained at the time of drilling has the advantage that results can be obtained quickly and inexpensively.
Japanese Patent Laid-Open No. 11-200355 (geological survey method)

  In this patent document 1, when drilling the ground using a rotary percussion drill, the relationship between the pushing force of the rod and the rotational torque required for the rotation of the rod is obtained at a certain depth, and the torque increase gradient At ( = Increase of rotational torque / Increase of pushing force) and soil distribution is determined by determining the distribution of torque increase gradient At for each soil.

  Among the boring machines that drill boring holes in the ground, the rotary percussion type machine that drills the ground by striking, thrust and rotation is the top hammer type where the hitting mechanism is on the ground, It is roughly divided into the down-the-hole hammer type just above the bit. The rotary percussion drill disclosed in Patent Document 1 is also a top hammer type.

  The latter down-the-hole hammer type can be further divided into those that generate an impact by air pressure and those that generate an impact by water pressure.

  The hydraulic down-the-hole hammer generates a large striking force directly above the bit for drilling. Compared to machines with a striking mechanism on the ground, the energy loss during rod transmission is very small and energy loss is very small. There is an advantage that efficiency is good. In addition, it has the advantage of being able to excavate even below the groundwater level, with less noise and no dust, compared to air-type down-the-hole hammers.

  Therefore, a boring machine using a hydraulic down-the-hole hammer (hereinafter referred to as a hydraulic down-the-hole hammer type machine) is equipped with a device that determines the ground condition from the drilling parameters as described above, and it is large while performing ground judgment. The method of drilling to the depth is a highly effective technique in practice.

  In this case, it is conceivable to apply the apparatus for the top hammer type boring machine to the hydraulic type down-the-hole hammer type machine as it is. This is possible because the hydraulic down-the-hole hammer machine uses the same base machine as the rotary percussion machine.

  However, since the hydraulic down-the-hole hammer type machine is a mechanism that generates a striking force directly above the bit, in the conventional method in which the striking energy is calculated by measuring the working oil pressure from the hydraulic mechanism on the ground, There is a problem that power cannot be grasped. Ground drilling is possible if the striking pressure is always constant, but the ground can be determined, but this method places a significant limitation on the striking force of a hydraulic down-the-hole hammer type machine, which is advantageous in that it has a large striking power. And cannot take advantage of the advantages. In addition, if the impact force is applied more than necessary when drilling holes in soft ground, the ground may be damaged, for example, the hole wall may collapse.

  Furthermore, the hydraulic down-the-hole hammer type machine has a phenomenon that the impact force is reduced due to wear of the bit, but the judgment device for the top hammer type machine cannot correct the data taking this into account, and the judgment accuracy is improved. It will be greatly reduced.

  In this way, in deep drilling, applying the current ground judgment method using a top hammer type boring machine, or applying a judgment device for top hammer to a hydraulic down-the-hole hammer type machine, It has many problems in terms of both work efficiency and ground judgment accuracy, and it cannot fully respond to the demand for application to deep boring.

  In addition, when adopting the method of judging the ground while recording the drilling parameters with the boring hole drilling using hydraulic down-the-hole hammer, the ground discrimination method used for existing rotary percussion is different as it is. If it is only applied to machine tools, it will be used as a criterion for determining the ground condition by utilizing the fact that the drilling speed changes according to the ground condition.

  However, the drilling speed also changes when the drilling specifications such as the striking force, rotational pressure, and supply pressure are changed (particularly the impact of the striking force is extremely large). In order to exclude the influence of the drilling specifications, for example, it is only necessary to drill with a constant striking force, but in actual drilling, the striking force and supply pressure are frequently changed according to the ground condition, If you don't change it, you won't be able to make the most of the striking force (even hard ground will be drilled over time with low striking force), or you will excavate fragile ground with excessive striking force and fill the hole wall Problems such as end.

  Also, with a hydraulic hammer, the impact force that is generated changes even if the water supply pressure is constant on the ground due to wear of the bit, so it is very difficult to make the impact force constant at all times. is there.

  The object of the present invention is to solve the disadvantages of the conventional example described above, deep boring capable of exhibiting the characteristics of a hydraulic down-the-hole hammer type machine that performs ground drilling by generating striking energy just above the bit by such high water pressure Under the environmental conditions where the excavation below the groundwater level and the generation of noise are restricted, the soil hardness and cavities, cracks, etc. are detected, and the geology, weathering / degradation status, etc. are accurately determined and displayed in real time. It is an object of the present invention to provide a ground determination method and a crack determination method and apparatus when drilling a boring hole with a hydraulic down-the-hole hammer.

  In order to achieve the above object, the present invention provides a ground determination and crack determination method using a hydraulic down-the-hole hammer. First, three mechanisms of a drilling parameter recording unit, an analysis / ground state determination unit, and a result display unit The drilling parameter recording unit is equipped with a measuring device for the hydraulic down-the-hole hammer type machine and / or its accessory equipment, and during drilling, the feed force, rotational torque, drilling parameters that are drilling parameters The gist is to collect speed, water supply flow rate, and water supply pressure, the ground condition determination unit evaluates the ground using its own determination formula and evaluation index, and the result display unit displays this in real time.

  Secondly, the measuring device measures the forward rotation pressure / reverse rotation pressure of the rotating part of the boring machine and the indentation pressure / lifting pressure of the feeding part. Depth sensor installed in the hoisting device to measure, pressure sensor installed in the water supply system on the ground to measure water pressure, flow meter installed in the water supply / drainage system on the ground to measure water flow Thirdly, the gist of the water supply flow rate is that the difference between the supply water to the high pressure pump and the return water amount returned as surplus water is measured by two flow meters.

Fourth, the analysis / ground condition determination unit calculates the rotational torque from the forward rotation pressure / reverse rotation pressure, the feed force from the indentation pressure / lifting pressure, and the drilling speed from the drilling depth and time. Organize and display for each depth together with the water supply pressure and water supply flow rate. Fifth, calculate the index value E of the drilling energy from the drilling parameters obtained for each depth using the following judgment formula, and make this value. The gist is to provide a threshold value, thereby distinguishing the hardness, cavity, and crack of the ground.
E = (α × V × A) / (Q × P)
V: Drilling speed (m / min)
A: Hole cross-sectional area (m ² )
Q: Water flow rate (m ³ / min)
P: Water supply pressure (MPa)
α: Correction coefficient based on feed force

  Sixthly, in addition to the determination based on the E value, the gist of the present invention is to detect an opening crack using changes in the water supply flow rate and water supply pressure as indices.

  Seventh, the result display unit displays the drilling speed, rotational torque, feed force, water supply pressure, water supply flow rate, and E value on the recording paper and monitor screen among the data obtained by the analysis / ground condition determination unit. Displaying in real time for each depth, Eighth, regarding the changes in E value, water supply flow rate and water supply pressure “changes in Q and P”, by inputting a threshold value, ground discrimination display is performed in real time. It is a summary.

  As a ground judgment and crack judgment device when drilling boring holes with a hydraulic down-the-hole hammer, the drilling parameter recording unit and the drilling parameters, feed force, rotational torque, drilling speed, water flow rate, Results of collecting the water supply pressure from this drilling parameter recording unit and displaying the evaluation of the ground in the analysis / ground condition determination unit and the analysis / ground condition determination unit that evaluates the ground with its own judgment formula / evaluation index in real time The drilling parameter recording unit is composed of three mechanisms, the display unit, and the hydraulic down-the-hole hammer type machine and / or its accessories. As a measuring device to measure the indentation pressure and pulling pressure, pressure sensor installed in the hydraulic system, measuring the drilling depth A depth sensor installed in the hoisting device, a pressure sensor installed in the water supply system on the ground to measure the water supply pressure, and a flow meter installed in the water supply / drainage system on the ground to measure the water flow rate It is what.

  According to the present invention, a measuring device is attached to the hydraulic down-the-hole hammer type machine and its accessory equipment, and the drilling parameters such as feed force, rotational torque, drilling speed, water supply flow rate, water supply pressure, etc. are provided during drilling. Collect and evaluate the ground using its own judgment formulas and evaluation indicators, and display this in real time, so that the ground can be judged accurately, quickly and inexpensively in deep drilling or in areas where noise regulations are strict. Can be performed.

  If the equipment and methods used in the existing top hammer type boring machine are applied to a hydraulic down-the-hole hammer type machine, the drilling work / efficiency is greatly restricted, or necessary drilling parameters can be obtained. However, it was highly possible that only data that did not satisfy the required accuracy could be obtained, but in the present invention, the advantages of the hydraulic down-the-hole hammer type machine that excels in drilling efficiency are utilized to the maximum, and necessary drilling parameters are set. Since the ground can be judged while collecting all of them and performing a double check with two judgment methods with different mechanisms, the ground judgment accuracy has increased dramatically.

  In addition, since it is combined with a boring method with high drilling efficiency suitable for deep boring drilling, called a hydraulic borehole hammer, a great effect can be expected in the following fields that require deep boring.

  In ground surveys and construction work where it is necessary to grasp the ground conditions over a wide area and at a large depth, if ground improvement is required up to a large depth, the area that needs to be improved can be efficiently grasped in real time.

  In construction to improve water permeability by injecting chemicals or cement, it is possible to efficiently grasp open cracks and cavities that require injection.

  In pile foundation work, anchor work, etc., it can be immediately determined whether or not the ground is suitable as a foundation ground.

  In the above-mentioned field, there are a core observation and a borehole scanner observation as conventional techniques, but both of them take time and a lot of cost in addition to drilling. In borehole scanner observation, if the ground is in poor condition, it may be difficult to insert and retrieve the camera. On the other hand, in this method, in any case, the ground can be determined in the work necessary for the construction process such as injection hole, pile insertion hole, anchor hole drilling, so it is very efficient. Since the necessary information can be provided quickly, it can greatly contribute to the efficiency improvement of the construction itself. In addition, it can be very effective when conducting surveys and construction work in residential areas and mountainous areas where noise is restricted.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an explanatory view showing one embodiment of a ground determination and crack determination method and apparatus at the time of drilling with a hydraulic down-the-hole hammer according to the present invention. As an apparatus used in the present invention, a “drilling parameter recording unit” ”,“ Analysis / Ground Condition Judgment Unit ”, and“ Result Display Unit ”. These devices are mounted on a boring machine 24 serving as a base machine.

  The hydraulic down-the-hole hammer 23 is built by a boring machine 24 to excavate the ground. As is well known, the down-the-hole hammer performs excavation by hitting generated by moving the hammer up and down by the movement of the piston, but the hydraulic down-the-hole hammer 23 shown in FIG. 2 is also a mechanism for generating hitting force directly above the bit. The piston case 17 is disposed immediately above the bit 25.

  FIG. 2 shows the structure of a hydraulic down-the-hole hammer. In the figure, 1 is a top sub, 2, 7, 9, 15, 20 are O-rings, 3 is a filter support, 4 is a filter, 5 is a shim, 6 Is a lid, 8 is a valve, 10 is a valve house, 11 is a sliding case, 12 is a piston, 13 is an inner tube, 14 is a piston bushing, 16 is a seal, 18 is a guide sleeve, 19 is a bit retainer ring, 21 is a driver sub , 22 are sleeves.

  The boring machine 24 is also a base machine, and includes a propulsion device 24a, a rotation device 24b, a feed chain / roller 24c, and a chuck device 24d of the hydraulic down-the-hole hammer 23. The “drilling parameter recording unit” is also shown in FIG. As shown, the following measuring device is provided for the boring machine 24, which is a base machine, and its attached equipment, and data for drilling is collected and recorded.

  FIG. 3 shows the arrangement and measurement items of the sensors installed in each device. Pressure sensors 27a, 27b installed in the hydraulic system of the ground drive unit for measuring the pushing pressure / lifting pressure of the propulsion device, and Rotary for measuring the drilling depth as a depth sensor by installing pressure sensors 28a and 28b installed in the hydraulic system of the ground drive unit and the feed chain roller 24c to measure the forward and reverse rotational pressures of the rotating device 24b. Encoder or wire encoder 27, pressure sensor 30 installed in the water supply system on the ground to measure the water supply pressure, electromagnetic flow meter 29 installed in the water supply / drainage system on the ground to measure the water supply flow rate, data collection when drilling is interrupted The pressure sensor 31 measures the closing and opening of the chuck device 24d.

  The pressure sensor 27a measures the hydraulic pressure supplied to the pushing (propulsion) side in the feed cylinder, and the pressure sensor 27b measures the hydraulic pressure supplied to the pulling (retreating) side in the feed cylinder. Seeking. The pressure sensor 28a measures the hydraulic pressure supplied to the forward rotation side in the rotary cylinder, and the pressure sensor 28b measures the hydraulic pressure supplied to the reverse rotation side, and obtains the rotational torque from the difference.

  The supply system of high-pressure water supplied to the hydraulic down-the-hole hammer includes the high-pressure pump 32, the fresh water tank 33, the raw water tank 34, the high-pressure valve 35, the submersible pump 36, and the filtration device 37 shown in FIG.

  For the water supply flow rate, the amount directly supplied from the high-pressure pump 32 that supplies high-pressure water to the hydraulic down-the-hole hammer 23 is measured by a flow meter or the like, or the supply water (supply) to the high-pressure pump 32 and surplus water are returned. (Return) The amount of water can be measured by two flow meters 31 and the difference can be used as the water supply amount.

  In the case of measuring the water supply pressure with higher accuracy, it is possible to use a high-performance pressure sensor to measure the water pulsation accompanying the bit operation, and to obtain the number of hits from the result.

  In the present invention, the drilling parameters that can be collected by the hydraulic pressure of the conventional ground drive unit are collected at the ground part, and the striking force that cannot be collected on the ground is a mechanism that generates a blow by water pressure immediately above the bit. A mechanism that collects and records the water pressure and flow rate in the drilling hole, which has a high correlation with the impact force, and estimates it from this. Data obtained by these sensors is sent to a recording unit and recorded every time.

  The “analysis / ground condition determination unit” is based on a personal computer, calculates the rotational torque from the forward rotation pressure and reverse rotation pressure, the feed force from the indentation pressure and the lifting pressure, and the drilling speed from the drilling depth and time. These are organized and recorded for each depth along with the water pressure and water flow rate.

  If the striking force (ie, water flow rate, water pressure), supply pressure, or rotational pressure is not changed during drilling, the ground condition will be reflected directly in the drilling speed. Cavity and opening cracks can be estimated.

  At this time, the opening cracks and cavities are extremely less resistant to drilling and faster than the surrounding rocks and ground, and the drilling speed is faster, so the opening width and cavity width are shown on the drilling speed chart arranged according to the depth. The peak corresponding to is made. As a result, it is possible to determine an opening crack or a cavity. Regarding geology and rock types, differences in geology and rock types can be estimated by changing the relative drilling speed.

  FIG. 4 is a schematic example of a chart diagram in which the drilling parameters obtained when the striking force (that is, the water supply flow rate, the water supply pressure), the supply pressure, and the rotation pressure are not changed during the drilling are arranged for each depth. On the graph, the drilling speed is relatively slow in the soft part and the hollow part as compared with the hard part, and the value sharply increases at the opening crack part, and shows a needle-like peak corresponding to the crack width.

However, in normal boring holes, holes are formed by changing the striking force, supply pressure, and rotational torque. In this case, since the drilling conditions are different, it is difficult to accurately determine the geology, rock type, opening crack, cavity, and the like simply from the drilling speed. Therefore, the index value E of the drilling energy is calculated according to the following determination formula, and a threshold value is provided for this value, thereby determining the hardness of the ground, the hollow portion, and the crack.
E = (α × V × A) / (Q × P)
V: Drilling speed (m / min)
A: Hole cross-sectional area (m ² )
Q: Water flow rate (m ³ / min)
P: Water supply pressure (MPa)
α: Correction coefficient based on feed force

  FIG. 5 shows the ground condition corresponding to the E value for each depth. On the graph, the E value is relatively high in the soft part and the hollow part, and at the opening crack part, the value rises rapidly, and it is detected by showing the acicular peak corresponding to the crack width. Is possible.

  At this time, in order to make a more accurate judgment, the actual ground condition is checked against the index value E from the core or borehole scanner image, etc. Understand the E value of cracks and E values of cracks and cavities, and use the boundary value (threshold value) to draw the E value obtained during subsequent drilling and Judgment of geology, rock type, cracks and cavities Figure 5 shows the threshold values of A and B rocks with different rock types (B rock is relatively softer), healthy rocks, and open cracks. The method to do was shown typically. The collation with the core or borehole scanner image does not have to be performed for many holes, and it is sufficient to perform collation for about one hole in the same geology and rock types.

  Further, the hydraulic down-the-hole hammer 23 has a characteristic that even if the feed pressure of the high-pressure water discharged from the high-pressure pump is controlled to a constant level due to bit wear, the feed water flow rate changes and the impact force decreases. However, it is difficult to perform drilling with a constant value. However, in the E value, this effect can be excluded by taking the product of the water supply flow rate and the water supply pressure on the numerator side of the equation.

  With the hydraulic down-the-hole hammer 23, the impact force is extremely large, so the feed force has little effect on the drilling speed. For this reason, α = 1 is usually used, but depending on the ground, the feed force may have a large effect on the drilling speed. In such a case, a correlation is obtained from the preceding drilling data, and a correction coefficient based on the feed force is determined.

  In this method, it is also possible to detect open cracks by a method based on a hydraulic down-the-hole hammering mechanism, which is a principle different from the E value calculated based on the change in drilling speed. is there. FIG. 6 schematically shows a method for detecting an opening crack from changes in the water supply flow rate and the water supply pressure.

  The hydraulic down-the-hole hammer 23 generates a blow to the bit by sending high-pressure water to the hammer portion. When no load is applied to the bit, the water is ejected from the tip of the bit. When a load is applied to the bit, high-pressure water is guided to another discharge route, and the discharge is caused by repeated discharge and stop. Therefore, in an open crack or cavity where no load is applied to the tip of the bit, the high-pressure water is suddenly discharged forward, the water supply pressure rapidly decreases, and conversely, the water supply flow rate increases rapidly. A location where such a phenomenon appears can be identified and detected as an opening crack or a cavity. In particular, in the opening crack portion, a sharp peak is formed on the graph due to a sudden change, and thus it is easy to detect.

  In borehole drilling in ordinary ground, drilling is performed while finely changing the drilling striking force, propulsive force, rotational torque, etc. according to the state of the ground, so the drilling speed is also affected by it. In order to eliminate this effect as much as possible, the judgment based on the E value mentioned above incorporates an index of impact force (specifically, the product of the water supply flow rate and the water supply pressure) into the equation, and further considers correction by the feed force. Nevertheless, the accuracy of detection of fine opening cracks is inevitably reduced in crack zones where the opening cracks are dense, or in places where rock formation is poor and drilling is difficult unless the striking force and supply pressure are changed frequently. there is a possibility. For this reason, in the present invention, not only the determination based on the E value but also this “change in water supply pressure and water supply flow rate” is used as an index for ground determination, and it is possible to perform highly accurate ground determination by using two indexes with different mechanisms. Become. If only opening cracks are detected, it is possible to detect only “changes in water supply pressure and water flow rate”, which is an index that is hardly affected by changes in impact force, supply pressure, and rotational torque.

  In the “result display section”, among the data obtained by the “analysis / ground condition determination section”, the drilling speed, rotational torque, feed force, water supply pressure, water supply flow rate, E value are as shown in FIG. In addition, the recording paper and the monitor screen 38 are displayed in real time for each depth.

  Further, regarding the E value, the ground discrimination display can be performed in real time by inputting a threshold value.

  FIG. 8 shows the result of actually applying this method. Here, the accuracy of determination is confirmed by comparing with data obtained by borehole scanner observation.

The procedure for carrying out the present invention is as follows.
(1) Prior to drilling, the apparatus of the present invention is mounted on the boring machine 24, which is a base machine, and peripheral equipment.
(2) Excavation specifications (blow pressure, supply pressure, etc.) should be measured with either the blow pressure or supply pressure fixed if possible, but priority is given to ensuring the quality of the borehole and The operator may adjust accordingly.
(3) Detection of changes in geology, cavities, soft parts and open cracks from changes in E value, water supply flow rate, and water supply pressure.
(4) If there are multiple boreholes to be measured, check the core observation data and borehole scanner observation data with one hole and set the threshold value for the E value, etc. to increase the accuracy of the data. It is desirable to perform subsequent detection.

It is explanatory drawing which shows one Embodiment of the ground determination and crack determination method and apparatus using the hydraulic down-the-hole hammer of this invention. It is a disassembled perspective view of a hydraulic down-the-hole hammer. BRIEF DESCRIPTION OF THE DRAWINGS It is a conceptual explanatory drawing which shows one Embodiment of the ground determination and crack determination method and apparatus using the hydraulic down-the-hole hammer of this invention. It shows typically the relationship between the drilling speed and the ground condition in the graph displayed in the result display section. Of the graph displayed on the result display section, the relationship between the E value and the ground condition is schematically shown. It is the schematic diagram which showed roughly the method of detecting an opening crack from the change of a water supply flow volume and a water supply pressure. It is the schematic diagram which showed roughly the method of determining a ground condition from the change of E value displayed on a result display part, water supply flow volume, and water supply pressure. The graph displayed in real time on a result display part is shown.

Explanation of symbols

1 Top sub 2 O ring 3 Filter support 4 Filter 5 Shim 6 Lid 7 O ring 8 Valve 9 O ring 10 Valve house 11 Sliding case 12 Piston 13 Inner tube 14 Piston bushing 15 O ring 16 Seal 17 Piston case 18 Guide sleeve 19 Bit Retainer ring 20 O-ring 21 Driver sub 22 Sleeve 23 Hydraulic down-the-hole hammer 24 Boring machine 24a Propulsion device 24b Rotating device 24c Feed chain / roller 24d Chuck device 25 Bit 26 Rotary encoder 27a, 27b Pressure sensor 28a, 28b Pressure sensor 29 Electromagnetic flow Total 30 Pressure sensor 31 Pressure sensor 32 High pressure pump 33 Fresh water tank 34 Raw water tank 35 High pressure valve 36 water pump 37 filtration system 38 monitor screen

Claims (9)

  It consists of three mechanisms: a drilling parameter recording unit, an analysis / ground condition determination unit, and a result display unit. The drilling parameter recording unit provides a measuring device for the hydraulic down-the-hole hammer type boring machine and / or its attached equipment. During mounting and drilling, the drilling parameters such as feed force, rotational torque, drilling speed, water supply flow rate, and water supply pressure are collected, and the ground condition judgment unit evaluates the ground using its own judgment formula and evaluation index. In the result display unit, this is displayed in real time, and a ground determination method and a crack determination method at the time of boring drilling by a hydraulic down-the-hole hammer.   The measuring device is used to measure the forward / reverse pressure of the rotating part of the boring machine and the pushing / lifting pressure of the feed part, as well as the pressure sensor installed in the hydraulic system and the depth of drilling. The depth sensor installed in the hoisting device, the pressure sensor installed in the water supply system on the ground to measure the water supply pressure, and the flow meter installed in the water supply / drainage system on the ground to measure the water supply flow rate. Ground judgment and crack judgment method when drilling boring with a hydraulic down-the-hole hammer.   The water supply flow rate is determined by the hydraulic down-the-hole hammer according to claim 2, wherein the supply water to the high-pressure pump and the return water amount at the time of boring drilling that returns as surplus water are measured with two flow meters, and there is a difference between them. Ground judgment and crack judgment method when drilling holes.   The analysis / ground condition judgment unit calculates the rotational torque from the forward rotation pressure and reverse rotation pressure, the feed force from the indentation pressure and the lifting pressure, and the drilling speed from the drilling depth and time, and these are used as the water supply pressure and water supply. The ground determination method and crack determination method at the time of drilling with a hydraulic down-the-hole hammer according to any one of claims 1 to 3, wherein the depth is arranged and displayed together with the flow rate. The index value E of the drilling energy is calculated from the drilling parameters obtained for each depth by the following judgment formula, and a threshold value is provided for this value, whereby the hardness, cavity, and crack of the ground are discriminated. The ground judgment and crack judgment method at the time of boring drilling by the hydraulic type down-the-hole hammer in any one of Claim thru | or 4.
E = (α × V × A) / (Q × P)
V: Drilling speed (m / min)
A: Hole cross-sectional area (m ² )
Q: Water flow rate (m ³ / min)
P: Water supply pressure (MPa)
α: Correction coefficient based on feed force   The ground at the time of boring drilling by a hydraulic down-the-hole hammer according to any one of claims 1 to 5, wherein, in addition to the determination based on the E value, detection of an opening crack is performed using changes in the water supply flow rate and water supply pressure as indices. Judgment and crack judgment method.   In the result display section, the drilling speed, rotational torque, feed force, water supply pressure, water supply flow rate, and E value of the data obtained by the analysis / ground condition determination section are recorded in real time for each depth on the recording paper and monitor screen. The ground determination method and crack determination method at the time of boring drilling by the hydraulic down-the-hole hammer according to any one of claims 1 to 6.   The ground judgment and cracks at the time of boring drilling with a hydraulic down-the-hole hammer according to claim 7, wherein the ground identification display is performed in real time by inputting a threshold value regarding changes in the E value of the index, the water flow rate and the water pressure. Judgment method.   Drilling parameter recording unit, and during drilling, the drilling parameters feed force, rotational torque, drilling speed, water supply flow rate, water supply pressure are collected from this drilling parameter recording unit, and its own judgment formula and judgment It consists of three mechanisms: an analysis / ground condition determination unit that evaluates the ground by means of an index, and a result display unit that displays the evaluation of the ground in the analysis / ground condition determination unit in real time. Installed in the working hydraulic system as a measuring device to measure the forward and reverse rotational pressures of the rotating part of the boring machine and the pushing and lifting pressures of the feeding part for the down-the-hole hammer type boring machine and / or its accessories Pressure sensor, depth sensor installed in hoisting device to measure drilling depth, water supply on the ground as a measure of water pressure Ground pressure detection device and crack determination device for boring drilling holes with a hydraulic down-the-hole hammer, which is equipped with a pressure sensor installed in the system and a flow meter installed in the ground water supply / drainage system to measure the water flow rate .

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