Penetration rod wrench

Abstract

To provide a wrench for a penetration rod that can easily loosen a threaded part of a connected penetration rod.SOLUTION: A wrench for a penetration rod 50 is a tool for loosening a penetration rod 1 connected by threaded connection, and comprises a rod-shaped gripping portion 51 and a hook portion 52 at the end of the gripping portion that can engage a grooved engagement portion 5a on the outer circumference of the penetration rod 1. This wrench for the penetration rod can easily loosen the threaded part of the penetration rod because it comprises a hook part that can engage the engagement portion of the penetration rod.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a penetration rod wrench for uncoupling grooved penetration rods used, for example, in Swedish sounding tests and similar penetration tests. [Background technology]

[0002] Conventionally, a penetration tester has been used for ground investigation such as a Swedish sounding test and a similar penetration test (for example, a screwdriver sounding test). A penetration rod shown in Patent Document 1 is known as an instrument used in this penetration tester.

[0003] The penetration rod is configured to have a screw point connected to the tip and to penetrate the ground by piercing the screw point into the ground. The outer circumferential surface is provided with a groove-shaped locking portion, and the penetration rod is held by the penetration tester by engaging the locking portion with the engaging means of the chuck unit of the penetration tester. The chuck unit is placed on a lifting platform that can be raised and lowered along the support of the penetration tester, so that the penetration rod penetrates the ground as the lifting platform descends.

[0004] The penetration rod has male and female threads at both ends, and is extended by screwing the female thread of the extension penetration rod into the male thread of the penetration rod. After disengaging the chuck unit from the penetration rod, the lifting platform is raised to engage the engagement means of the chuck unit with the locking portion of the extension penetration rod. Finally, the lifting platform is lowered again to allow the penetration rod to penetrate deep into the ground. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2000-265451 A DISCLOSURE OF THEINVENTION [Problem to be solved by the invention]

[0006] At the end of the penetration test, the penetration rods are pulled out, and pipe wrenches are attached to both penetration rods to loosen the threads of the penetration rods. However, it is difficult to operate two pipe wrenches, and it is sometimes impossible to loosen the threads of the penetration rods.

[0007] The present invention has been created in view of the above problems, and aims to provide a tool that can easily loosen the screw portions of connected penetration rods. [Means for solving the problem]

[0008] The above problem is solved by a penetration rod wrench for loosening a penetration rod connected by a screw connection, the wrench being composed of a rod-shaped gripping portion and a hook portion provided at the tip of the gripping portion and capable of engaging with a groove-shaped locking portion provided on the outer circumferential surface of the penetration rod, the locking portion of the penetration rod being: At one end of the penetration rod The hook portion is attached perpendicularly to the penetration rod by abutting and engaging with one of the locking portions of the penetration rod and the outer circumferential surface between the remaining locking portions. The connection between the penetration rods is released by rotating the penetration rod in a direction that allows the screw connection to be released while the outer circumferential surface of the other end of the other penetration rod connected by the screw connection is held with a pipe wrench. A penetration rod wrench can solve this problem. Effect of the Invention

[0009] The penetration rod wrench of the present invention has a hook portion that can engage with the locking portion of the penetration rod, making it easy to loosen the threaded portion of the penetration rod. [Brief description of the drawings]

[0010] [Figure 1] 1A and 1B are diagrams showing a penetration rod wrench of the present invention, in which (a) is a front view and (b) is a right side view. [Diagram 2] FIG. 1 is a diagram showing a penetration test machine. [Diagram 3] FIG. 2 is a diagram showing a state in which the penetration rod wrench of the present invention is used. [Figure 4] FIG. 2 is a cross-sectional view showing the use of the penetration rod wrench of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In Fig. 2, reference numeral 10 denotes a penetration tester, which has a support 11, and a lifting platform 13 is arranged so as to be able to move up and down along the support 11 by driving a motor 12. The lifting platform 13 is equipped with a motor 14 as a driving source, and a chuck unit 15 which rotates by receiving the drive of the motor 14. The penetration rod 1 is inserted into and held by the chuck unit 15.

[0012] As shown in FIG. 3, the penetration rod 1 comprises an axial main body shaft portion 2, a generally conical penetration body 3 provided at one end of the main body shaft portion 2, and a male threaded portion 4 integrally molded at the other end of the main body shaft portion 2. On the outer periphery of the other end of the main body shaft portion 2 where the male threaded portion 4 is not molded, a locking portion 5a of equal length is molded by dividing the outer periphery into three equal parts.

[0013] The locking portion 5a is a long groove having an arc-shaped cross section, and is formed with a depth and shape suitable for engagement with a steel ball, which is an example of an engagement means built into the chuck unit 15 described above.

[0014] In addition, since the length of the penetration rod 1 alone is insufficient for the penetration test, an extension rod 6 is also prepared. One end of this extension rod 6 is formed with a female thread 7 that screws into the male thread of the penetration rod 1, and the other end is integrally formed with the male thread 4 and the locking portions 5a, 5b, just like the penetration rod 1. In other words, this extension rod 6 is formed with a female thread 7 instead of the penetration body 3 of the penetration rod 1.

[0015] The test method is as follows: the lifting platform 12 is lowered and the motor 13 is driven to rotate the chuck unit 15, rotating the penetrator 3 as it penetrates into the ground; the torque detector 20 detects the rotational load torque that the penetrator 3 receives in the soil, and the amount of rotation of the penetrator 3 for each prescribed amount of penetration is also recorded one by one. These test data are used as information for judging the soil quality after the penetration test is completed.

[0016] Furthermore, the extension rod 6 is added several times during the test. Here, the operation of adding the extension rod 6 to the penetration rod 1 will be described, but the operation of adding the extension rods 6 to each other is similar.

[0017] To add the extension rod 6 to the penetration rod 1, first, the motor 13 is stopped, and the female screw portion 7 of the extension rod 6 is screwed into the male screw portion 4 of the penetration rod 1 that has penetrated into the ground. Next, while sliding the sliding sleeve of the chuck unit 15 downward, the chuck unit 15 is rotated until the steel ball (not shown) built into the chuck unit is released from the locking portion 5a, and as described above, the sliding sleeve is blocked by the steel ball and cannot return upward. From this state, the lift table 12 is raised to move the chuck unit 15 to the position where the locking portion 5a of the extension rod 6 is formed, and the chuck unit 15 is rotated again, and the steel ball fits into the locking portion 5a of the extension rod 6 to hold the extension rod 6. After that, the penetration tester is restarted, and the penetration test is continued in the same manner as described above.

[0018] When the penetration test is completed by penetrating the penetration rod 1 to a predetermined depth, the penetration rod 1 is finally pulled out. The pulling out is performed using a known dedicated pulling machine (not shown). The pulled out penetration rods 1 are connected to each other by the threaded portions 4 and 7, so they are loosened using the penetration rod wrench 50 of the present invention.

[0019] FIG. 1 shows a wrench 50 for a penetration rod, which is composed of a rod-shaped gripping portion 51 and a hook portion 52 integrally formed at the tip of the gripping portion 51.

[0020] As shown in Fig. 4, the hook portion 52 is configured to be inserted laterally into the locking portion 5b of the penetration rod 1 and engage with the circumferential direction of the penetration rod 1. Therefore, by holding one of the penetration rods 6 with the pipe wrench 100, engaging the hook portion 52 of the penetration rod wrench 50 with the other penetration rod 1, and rotating the gripping portion 51 in a direction that loosens the threaded portions 4, 7 of the penetration rod 1, a large force is applied to the penetration rod that can loosen the threaded portions 4, 7 by the principle of leverage. This makes it possible to easily loosen the threaded portions of the penetration rod 1 and the extension rod 6. [Explanation of symbols]

[0021] 1 Penetrating Rod 5a Locking part 6 Extension rod 10 Penetration tester 15 Chuck unit 50 Penetration rod wrench 51 Gripping part 52 Hook part

Claims

[Claim 1] A wrench for a penetration rod, comprising a rod-shaped gripping portion and a hook portion provided at the tip of the gripping portion and capable of engaging with a groove-shaped locking portion provided on the outer peripheral surface of the penetration rod, for loosening a penetration rod connected by a screw connection, The locking portion of the penetration rod is a vertical groove provided at three locations at equal intervals in the circumferential direction on the outer peripheral surface of one end of the penetration rod, The hook portion is attached perpendicularly to the penetration rod by abutting and engaging with one of the locking portions of the penetration rod and the outer circumferential surface between the remaining locking portions, while The connection between the penetration rods is released by rotating the penetration rod in a direction that allows the screw connection to be released while the outer circumferential surface of the other end of the other penetration rod connected by the screw connection is held with a pipe wrench; A wrench for a penetration rod, characterized in that

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