Standard penetration test device

Abstract

To provide a standard penetration test device that can be made smaller.SOLUTION: A standard penetration test device 1 comprises: a drilling mechanism 3 that holds a rod with a drilling tool connected to the bottom so that the rod can rotate and descend and that uses the drilling tool to drill a hole in the ground that is a measurement position where an N value is determined; a first swivel support 4 that rotatably supports the drilling mechanism 3 to allow the drilling mechanism 3 to be retracted from the measurement position; a hydraulic motor 5 that is provided at an upper end of the first swivel support 4 and rotates the rod held by the drilling mechanism 3 via a gear; an impact mechanism 6 that is connected via a rod to a sampler placed in the hole drilled by the drilling mechanism 3 and drives the sampler into the ground to determine the N value; and a second swivel support 7 that rotatably supports the impact mechanism 6 to allow the impact mechanism 6 to be retracted from the measurement position.SELECTED DRAWING: Figure 1B

Description

[Technical Field]

[0001] The present invention relates to a standard penetration test device. [Background technology]

[0002] Patent Documents 1 and 2 disclose a standard penetration test device that includes a drilling mechanism that drills a hole in the ground and a striking mechanism that drives a sampler into the ground to determine the N value.

[0003] In these standard penetration test devices, the excavation mechanism can be retracted from the measurement position where the N value is determined by sliding the slide frame back and forth relative to the base body. Also, the impact mechanism can be retracted from the measurement position where the N value is determined by sliding the slide frame back and forth relative to the base body and rotating the impact mechanism around the rotating support. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6661160 [Patent Document 2] Patent No. 6664649 Summary of the Invention [Problem to be solved by the invention]

[0005] Such standard penetration test equipment has a structure in which the slide frame slides back and forth relative to the base body, which limits how small the equipment can be made.

[0006] The present invention has been made in consideration of the above problems, and aims to provide a standard penetration test device that can be made smaller. [Means for solving the problem]

[0007] The present invention provides a standard penetration test apparatus comprising: a drilling mechanism (e.g., drilling mechanism 3 described below) that holds a rod connected to the bottom of a drilling tool so that it can rotate and descend, and that uses the drilling tool to drill a hole in the ground that will serve as a measurement position for determining the N value; a first rotating support (e.g., first rotating support 4 described below) that rotatably supports the drilling mechanism, allowing the drilling mechanism to be retracted from the measurement position; a hydraulic motor (e.g., hydraulic motor 5 described below) that is provided at the upper end of the first rotating support and serves as a power source that rotates the rod held by the drilling mechanism via a gear; a striking mechanism (e.g., striking mechanism 6 described below) that is connected via a rod to a sampler placed in the hole excavated by the drilling mechanism and drives the sampler into the ground to determine the N value; and a second rotating support (e.g., second rotating support 7 described below) that rotatably supports the striking mechanism, allowing the striking mechanism to be retracted from the measurement position. [Effects of the Invention]

[0008] According to the standard penetration test device of the present invention, a hydraulic motor is used as the power source for rotating the rod held by the drilling mechanism, and the hydraulic motor is installed at the upper end of the first rotating support. The drilling mechanism is rotatably supported on the first rotating support, which makes it possible to retract the drilling mechanism from the measurement position where the N value is determined, thereby making it possible to reduce the size of the device. [Brief explanation of the drawings]

[0009] [Figure 1A] FIG. 1 is a front view of a standard penetration test device according to an embodiment of the present invention, showing a state in which the excavation mechanism and the impact mechanism are each retracted from the measurement position. [Figure 1B] FIG. 1 is a schematic plan view of the standard penetration test device, showing the state in which the excavation mechanism and the impact mechanism are retracted from the measurement position. [Figure 2A] FIG. 1 is a front view of the standard penetration test device, showing the state in which the excavation mechanism is placed at the measurement position and the impact mechanism is retracted from the measurement position. [Figure 2B]FIG. 1 is a schematic plan view of the standard penetration test device, showing the excavation mechanism in the measurement position and the impact mechanism retracted from the measurement position. [Figure 3A] FIG. 1 is a front view of the standard penetration test device, showing the state in which the excavation mechanism is retracted from the measurement position and the impact mechanism is placed at the measurement position. [Figure 3B] FIG. 1 is a schematic plan view of the standard penetration test device, showing the excavation mechanism retracted from the measurement position and the impact mechanism positioned at the measurement position. DETAILED DESCRIPTION OF THE INVENTION

[0010] A standard penetration test apparatus 1 according to an embodiment of the present invention will be described in detail below with reference to Figures 1A, 1B, 2A, 2B, 3A, and 3B. In each figure, arrow F indicates the front, arrow B indicates the rear, arrow L indicates the left, arrow R indicates the right, arrow U indicates the up, and arrow D indicates the down.

[0011] First, the configuration of a standard penetration test apparatus 1 according to an embodiment will be described using FIGS. 1A, 1B, 2A, 2B, 3A, and 3B. FIG. 1A is a front view of the standard penetration test apparatus 1, showing the excavation mechanism 3 and the impact mechanism 6 retracted from their measurement positions. FIG. 1B is a schematic plan view of the standard penetration test apparatus 1, showing the excavation mechanism 3 and the impact mechanism 6 retracted from their measurement positions. FIG. 2A is a front view of the standard penetration test apparatus 1, showing the excavation mechanism 3 positioned at the measurement position and the impact mechanism 6 retracted from its measurement position. FIG. 2B is a schematic plan view of the standard penetration test apparatus 1, showing the excavation mechanism 3 positioned at the measurement position and the impact mechanism 6 retracted from its measurement position. FIG. 3A is a front view of the standard penetration test apparatus 1, showing the excavation mechanism 3 retracted from its measurement position and the impact mechanism 6 retracted from its measurement position. FIG. 3B is a schematic plan view of the standard penetration test device 1, showing the state in which the excavation mechanism 3 has been retracted from the measurement position and the striking mechanism 6 has been placed at the measurement position.

[0012] The standard penetration test apparatus 1 shown in Figures 1A, 1B, 2A, 2B, 3A, and 3B is used for standard penetration tests to determine ground strength, and is used with the number of rods corresponding to the depth connected to each other.

[0013] A standard penetration test is a test performed using the standard penetration test method specified in the Japanese Industrial Standards (JIS A 1219:2023). In a standard penetration test, a sampler is placed in a hole in the ground, and a guide rod 60 is connected to the sampler via a rod. A hammer 61 weighing 63.5±0.5 kg is then dropped from a height of 760±10 mm onto an anvil 62 fixed to the guide rod 60 to drive the sampler into the ground. In this standard penetration test, the number of blows required to drive the sampler 300 mm is calculated as the N-value, which indicates the strength of the ground. The rod, excavator, sampler, guide rod 60, and anvil 62 are all connected by screws, and can be connected or disconnected by rotating them.

[0014] Specifically, the standard penetration test device 1 includes a base machine 2, an excavation mechanism 3, a first rotating support 4, a hydraulic motor 5, a striking mechanism 6, a second rotating support 7, a suspension mechanism 8, and the like.

[0015] The base machine 2 enables the standard penetration test device 1 to be self-propelled. Specifically, the base machine 2 includes a base body 20, a pair of left and right caterpillar tracks 21, front and rear outriggers 22 on the left and right, and the like.

[0016] A pair of caterpillar tracks 21 are attached to the left and right sides of the base body 20. Outriggers 22 are attached to the base body 20 on the front, rear, left and right sides.

[0017] The excavation mechanism 3 is rotatably supported by a first swivel support 4 provided on the front right side of the base body 20. The excavation mechanisms 3 are interconnected, and a rod (not shown) connected to a digging tool (not shown) at the bottom and a swivel joint (not shown) at the top can be inserted vertically, and the rod (not shown) is held rotatably and lowerably. The excavation mechanism 3 also uses the digging tool (not shown) to excavate holes in the ground that will serve as measurement positions for determining the N value.

[0018] The first swivel support column 4 is provided on the front right side of the base body 20 and is operated by a hydraulic cylinder (not shown). The first swivel support column 4 rotatably supports the excavation mechanism 3, thereby enabling the excavation mechanism 3 to retreat from the measurement position.

[0019] The hydraulic motor 5 is provided at the upper end of the first rotating column 4. When hydraulic oil is supplied to the hydraulic motor 5 via a hose (not shown), the hydraulic motor 5 becomes a power source that rotates the rod held by the excavation mechanism 3 via a gear (not shown).

[0020] The impact mechanism 6 is rotatably supported by a second pivot support 7 provided on the left front of the base body 20. This impact mechanism 6 is connected via a rod to a sampler placed in a hole excavated by the excavation mechanism 3, and drives the sampler into the ground to determine the N value.

[0021] Specifically, the striking mechanism 6 includes a guide rod 60, a hammer 61, an anvil 62, a guide rod leader 63, a hammer chuck 64, a hammer chuck lifting mechanism (not shown), and the like.

[0022] The guide rod 60 is connected via an anvil 62 to the upper end of a rod to which a sampler is connected at the bottom, and guides the free fall of the hammer 61. The guide rod 60 is supported in front of a guide rod leader 63 so as to be parallel to the guide rod leader 63 and to be movable up and down relative to the guide rod leader 63. The guide rod 60 also has a bump 60a midway along the guide rod 60 (for example, at a position 760±10 mm above the lower end). When the hammer chuck 64 reaches the bump 60a, the hammer 61 is released from the hammer chuck 64, allowing the hammer 61 to fall freely.

[0023] The hammer 61 is provided so as to be movable along the guide rod 60. The hammer 61 falls freely along the guide rod 60 and collides with the anvil 62, thereby striking the anvil 62 and indirectly striking the sampler.

[0024] The anvil 62 is interposed between the upper end of a rod connected to the lower part of the sampler and the lower end of the guide rod 60, and is struck by the hammer 61 which falls freely.

[0025] The guide rod leader 63 is erected via a second pivot support 7 on the left front side of the base body 20 so as to be rearward of the guide rod 60 and parallel to the guide rod 60. A hammer chuck 64 is attached to the guide rod leader 63 so as to be movable along the guide rod leader 63. The guide rod leader 63 incorporates a hammer chuck lifting mechanism (not shown).

[0026] The hammer chuck 64 is provided so as to be movable along the guide rod 60 and the guide rod leader 63, and holds the hammer 61, moves the held hammer 61 upward, and then releases the hold on the hammer 61, allowing the hammer 61 to fall freely.

[0027] The hammer chuck lifting mechanism (not shown) is composed of an endless chain (not shown) to which the hammer chuck 64 is fixed, a sprocket (not shown) along which the endless chain (not shown) runs, and the like, and as the endless chain (not shown) runs, the hammer chuck 64 is raised and lowered along the guide rod leader 63.

[0028] The second pivoting support column 7 is provided on the left front side of the base body 20 and is operated by a hydraulic cylinder (not shown). This second pivoting support column 7 pivotally supports the impact mechanism 6, thereby enabling the impact mechanism 6 to be retracted from the measurement position and enabling the suspension mechanism 8 to be placed at the measurement position.

[0029] The hanging mechanism 8 is provided behind the guide rod leader 63. This hanging mechanism 8 is used to hang the sampler from the hole. Specifically, the hanging mechanism 8 includes a winch 80, a wire 81, a pulley 82, a hook 83, and the like.

[0030] The winch 80 is provided on the back of the guide rod leader 63. The winch 80 winds and unwinds a wire 81, thereby raising and lowering a hook 83 attached to the tip of the wire 81.

[0031] The wire 81 extends from the winch 80 along the guide rod leader 63 toward the pulley 82 above, and then turns back at the pulley 82 and extends downward. The wire 81 is wound onto and unwound from the winch 80, thereby raising and lowering a hook 83 provided at the tip of the wire 81.

[0032] The pulley 82 is provided above the guide rod leader 63. The pulley 82 hooks a wire 81 extending from the winch 80 along the guide rod leader 63, and the wire 81 is folded back downward.

[0033] The hook 83 is attached to the tip of the wire 81. The hook 83 is suspended from the wire 81, and is raised and lowered by winding and unwinding the wire 81.

[0034] Next, the operation of the standard penetration test apparatus 1 will be described with reference to FIGS. 1A, 1B, 2A, 2B, 3A, and 3B.

[0035] As shown in FIGS. 1A and 1B, in the initial state of the standard penetration test device 1, the excavation mechanism 3 and the percussion mechanism 6 are each retracted from the measurement position.

[0036] As shown in FIGS. 2A and 2B, when drilling a hole in the ground, the standard penetration test apparatus 1 places the drilling mechanism 3 at the measurement position and retracts the percussion mechanism 6 from the measurement position.

[0037] As shown in FIGS. 3A and 3B, when the N value is to be determined, the standard penetration test device 1 retracts the excavation mechanism from the measurement position and keeps the striking mechanism 6 positioned at the measurement position.

[0038] That is, when excavating a hole in the ground, the standard penetration test apparatus 1 moves the excavation mechanism 3, which is retracted from the measurement position, to the measurement position, and leaves the percussion mechanism 6, which is retracted from the measurement position, as it is, maintaining the state of the percussion mechanism 6 retracted from the measurement position. After excavating the hole in the ground, the standard penetration test apparatus 1 retracts the excavation mechanism 3 from the measurement position.

[0039] When determining the N-value, the standard penetration test apparatus 1 moves the striking mechanism 6, which is retracted from the measurement position, to the measurement position, and leaves the excavation mechanism 3, which is retracted from the measurement position, as it is, maintaining the excavation mechanism 3 retracted from the measurement position. After determining the N-value, the standard penetration test apparatus 1 retracts the striking mechanism 6 from the measurement position.

[0040] As such, the standard penetration test apparatus 1 comprises a drilling mechanism 3 that holds a rod connected to the bottom of the drilling tool so that it can rotate and descend, and that uses the drilling tool to drill a hole in the ground that will serve as the measurement position where the N value is determined; a first swivel support 4 that rotatably supports the drilling mechanism 3, allowing the drilling mechanism 3 to be retracted from the measurement position; a hydraulic motor 5 that is provided at the upper end of the first swivel support 4 and serves as a power source that rotates the rod held by the drilling mechanism 3 via a gear; an impact mechanism 6 that is connected via a rod to a sampler placed in the hole excavated by the drilling mechanism 3, and drives the sampler into the ground to determine the N value; and a second swivel support 7 that rotatably supports the impact mechanism 6, allowing the impact mechanism 6 to be retracted from the measurement position.

[0041] Therefore, according to the standard penetration test device 1, a hydraulic motor 5 is used as a power source to rotate the rod held by the drilling mechanism 3, and the hydraulic motor 5 is provided at the upper end of the first rotating support 4. The drilling mechanism 3 is rotatably supported on the first rotating support 4, which makes it possible to retract the drilling mechanism 3 from the measurement position where the N value is determined, thereby making it possible to reduce the size of the device.

[0042] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the spirit and technical concept of the present invention. In other words, the position, size, length, number, shape, material, etc. of each component can be changed as appropriate. [Explanation of symbols]

[0043] 1 Standard Penetration Testing Apparatus 2 Base Machine 20 Base body 21 Caterpillar 22 Outrigger 3. Excavation mechanism 4. First pivoting support 5 hydraulic motors 6. Striking mechanism 60 Guide rod 60a Hump 61 Hammer 62 Anvil 63 Guide rod leader 64 Hammer chuck 7 Second pivoting support 8 Hanging mechanism 80 winch 81 Wire 82 Pulley 83 Hook F forward B Back L left R Right side U upward D Downward

Claims

[Claim 1] a drilling mechanism in which a drilling tool holds a rod connected to a lower portion thereof so that the rod can rotate and descend, and the drilling tool excavates a hole in the ground as a measurement position for determining the N value; A first pivot column that pivotally supports the excavation mechanism, thereby enabling the excavation mechanism to be retracted from the measurement position; a hydraulic motor provided at an upper end of the first rotating column and serving as a power source for rotating a rod held by the excavation mechanism via a gear; a striking mechanism connected via a rod to a sampler placed in the hole excavated by the excavation mechanism, for striking the sampler into the ground to determine the N value; a second pivoting support that pivotally supports the impact mechanism, thereby enabling the impact mechanism to be retracted from the measurement position. Standard penetration testing equipment.

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