Standard Penetration Testing Equipment

Abstract

To provide a standard penetration test device that can be made compact. [Solution] The standard penetration test device 1 is equipped with a drilling mechanism 3 that holds a rod connected to the lower part of the drilling tool so that it can rotate and descend, and uses the drilling tool to excavate a hole in the ground that serves as the measurement position for determining the N-value, a first swivel support 4 that rotatably supports the drilling mechanism 3, thereby 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 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, thereby allowing the impact mechanism 6 to be retracted from the measurement position.

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 an excavation mechanism that excavates a hole in the ground and a percussion mechanism that drives a sampler into the ground to determine the N value.

[0003] In these standard penetration test devices, the drilling mechanism can be retracted from the measurement position for determining the N value by sliding the slide frame back and forth relative to the base body. Also, the impact mechanism can be retracted from the measurement position for determining the N value by sliding the slide frame back and forth relative to the base body and rotating around the rotating column. [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 places limitations on how compact the equipment can be.

[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 compact. [Means for solving the problem]

[0007] (1)The present invention relates to a drilling mechanism (for example, a drilling mechanism 3 described later) that holds a rod connected to a lower portion of a drilling tool so that the rod can rotate and descend, and excavates a hole in the ground using the drilling tool to be a measurement position for determining the N value, and In plan view A first rotating support (e.g., first rotating support 4 described later) that rotatably supports the excavation mechanism to enable it to be withdrawn from the measurement position, a hydraulic motor (e.g., hydraulic motor 5 described later) that is provided at the upper end of the first rotating support and serves as a power source for rotating a rod held by the excavation mechanism via a gear, a striking mechanism (e.g., striking mechanism 6 described later) that is connected via a rod to a sampler placed in a hole excavated by the excavation mechanism and strikes the sampler into the ground to determine the N value, and In plan view and a second pivoting support (for example, a second pivoting support 7 described later) that pivotally supports the impact mechanism so that the impact mechanism can be retracted from the measurement position. The excavation mechanism is rotatable about the first rotating column in a plan view, and the impact mechanism is rotatable about the second rotating column in a plan view. This is a standard penetration test device characterized by the following: (2) The present invention also provides a standard penetration test apparatus as described in (1) above, characterized in that it includes a hose for supplying hydraulic oil to the hydraulic motor. Effect of the Invention

[0008] According to the standard penetration test apparatus of the present invention, a hydraulic motor is used as a power source for rotating the rod held by the drilling mechanism, and the hydraulic motor is mounted on the upper end of the first rotating column. The drilling mechanism is rotatably supported on the first rotating column, making it possible to retract the drilling mechanism from the measurement position where the N value is determined, thereby enabling the apparatus to be made more compact. [Brief description 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 each of the excavation mechanism and the impact mechanism has been retracted from the measurement position. [Figure 1B] FIG. 2 is a schematic plan view of the standard penetration test device, showing the state in which the excavation mechanism and the impact mechanism are each retracted from the measurement position. [Figure 2A] FIG. 2 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. 2 is a schematic plan view of the standard penetration test device, showing the state in which the drilling mechanism is placed at the measurement position and the striking mechanism is retracted from the measurement position. [Figure 3A] FIG. 2 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. 2 is a schematic plan 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. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, the standard penetration test apparatus 1 according to the embodiment of the present invention will be described in detail 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 upper side, and arrow D indicates the lower side.

[0011] First, the configuration of the standard penetration test apparatus 1 according to the embodiment will be described with reference to Figs. 1A, 1B, 2A, 2B, 3A, and 3B. Fig. 1A is a front view of the standard penetration test apparatus 1, showing a state in which the excavation mechanism 3 and the impact mechanism 6 have been retracted from the measurement position. Fig. 1B is a schematic plan view of the standard penetration test apparatus 1, showing a state in which the excavation mechanism 3 and the impact mechanism 6 have been retracted from the measurement position. Fig. 2A is a front view of the standard penetration test apparatus 1, showing a state in which the excavation mechanism 3 has been placed at the measurement position and the impact mechanism 6 has been retracted from the measurement position. Fig. 2B is a schematic plan view of the standard penetration test apparatus 1, showing a state in which the excavation mechanism 3 has been placed at the measurement position and the impact mechanism 6 has been retracted from the measurement position. Fig. 3A is a front view of the standard penetration test apparatus 1, showing a state in which the excavation mechanism 3 has been retracted from the measurement position and the impact mechanism 6 has been retracted from the measurement position. FIG. 3B is a schematic plan view of the standard penetration test apparatus 1, showing a state in which the excavation mechanism 3 has been withdrawn 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 in standard penetration tests to determine ground strength, and is used with the number of rods according to the depth connected to each other.

[0013] The standard penetration test is a test according to the standard penetration test method stipulated in the Japanese Industrial Standards (JIS A 1219:2023). In the standard penetration test, a sampler is set up in a hole in the ground, and a guide rod 60 is connected to the sampler via a rod. Then, a hammer 61 weighing 63.5±0.5 kg is dropped from a height of 760±10 mm onto an anvil 62 fixed to the guide rod 60 to drive the sampler in. 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, excavation tool, sampler, guide rod 60, and anvil 62 are connected to each other by screws, and are connected or removed by rotating them.

[0014] Specifically, the standard penetration test apparatus 1 includes a base machine 2, an excavation mechanism 3, a first rotating column 4, a hydraulic motor 5, an impact mechanism 6, a second rotating column 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 caterpillars 21, front and rear, left and right outriggers 22, 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 drilling mechanism 3 is rotatably supported by a first pivot support 4 provided on the front right side of the base body 20. The drilling mechanism 3 is connected to each other, and a rod (not shown) connected to a swivel joint (not shown) at its upper part and connected to a drilling tool (not shown) at its lower part can be inserted in the vertical direction, and holds the rod (not shown) rotatably and downwardly. The drilling mechanism 3 also uses the drilling tool (not shown) to excavate holes in the ground that will be measurement positions for determining the N value.

[0018] The first rotating 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 rotating support column 4 supports the excavation mechanism 3 so that the excavation mechanism 3 can be rotatably moved away from the measurement position.

[0019] The hydraulic motor 5 is provided at the upper end of the first rotating column 4. This hydraulic motor 5 is supplied with hydraulic oil via a hose (not shown) and serves as a power source for rotating a rod held by the drilling 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 lower part, 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 vertically movable 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 at a height of 760±10 mm from the lower end). When the hammer chuck 64 reaches the bump 60a, the bump 60a releases the hammer 61 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, the lower part of which is connected to a 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 on the left front of the base body 20 via the second pivot support 7 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 movably provided along the guide rod 60 and the guide rod leader 63, and holds the hammer 61 while moving the held hammer 61 upward and then releasing 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, etc., and raises and lowers the hammer chuck 64 along the guide rod leader 63 as the endless chain (not shown) runs.

[0028] The second pivoting support 7 is provided on the left front of the base body 20 and is operated by a hydraulic cylinder (not shown). This second pivoting support 7 pivotably 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 when hanging 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. This 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 also turns back at the pulley 82 and extends downward. The wire 81 is wound on and unwound from the winch 80 to raise and lower 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 apparatus 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 a measurement position and keeps the striking mechanism 6 away from the measurement position.

[0037] As shown in Figs. 3A and 3B, when determining the N value, the standard penetration test device 1 retreats 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 has been retracted from the measurement position, to the measurement position, and leaves the striking mechanism 6, which has been retracted from the measurement position, in that state, and maintains the striking mechanism 6 retracted from the measurement position. After excavating a hole in the ground, the standard penetration test apparatus 1 retracts the excavation mechanism 3 from the measurement position.

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

[0040] In this way, the standard penetration test apparatus 1 is equipped with: a drilling mechanism 3 that holds a rod connected to the lower part of the drilling tool so that it can rotate and descend, and uses the drilling tool to excavate a hole in the ground that serves as the measurement position where the N-value is determined; a first swivel support 4 that rotatably supports the drilling mechanism 3, thereby 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 for rotating 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, thereby allowing the impact mechanism 6 to be retracted from the measurement position.

[0041] Therefore, according to the standard penetration test apparatus 1, a hydraulic motor 5 is adopted as a power source for rotating the rod held by the drilling mechanism 3, and the hydraulic motor 5 is provided at the upper end of the first rotating column 4. The drilling mechanism 3 is rotatably supported on the first rotating column 4, making it possible to retract the drilling mechanism 3 from the measurement position where the N value is determined, thereby enabling the apparatus to be made more compact.

[0042] The present invention is not limited to the above-described embodiments, and various modifications are possible without departing from 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 appropriately changed. [Explanation of symbols]

[0043] 1 Standard Penetration Testing Apparatus 2. Base Machine 20 Base body 21 Caterpillar 22 Outrigger 3. Drilling mechanism 4. First Swivel Column 5 Hydraulic motor 6. Striking mechanism 60 Guide Rod 60a Hump 61 Hammer 62 Anvil 63 Guide Rod Leader 64 Hammer Chuck 7. Second Swivel Column 8 Suspension mechanism 80 Winch 81 Wire 82 Pulley 83 Hook F forward B Back L left R Right side U upward D Downward

Claims

1. a drilling mechanism that holds a rod connected to a lower portion of a drilling tool so that the rod can rotate and descend, and excavates a hole in the ground using the drilling tool to serve as a measurement position for determining the N value; A first rotating column that supports the excavation mechanism so as to be rotatable in a plan view, 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 disposed in a hole excavated by the excavation mechanism, for striking the sampler into the ground to determine the N value; a second pivot column that supports the impact mechanism so as to be pivotable in a plan view, thereby enabling the impact mechanism to be retracted from the measurement position; The excavation mechanism is rotatable around the first rotating column in a plan view, The impact mechanism is capable of rotating about the second rotating column in a plan view. Standard Penetration Testing Apparatus.

2. The hydraulic motor is provided with a hose for supplying hydraulic oil thereto.

2. The standard penetration test apparatus of claim 1.

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