JP3166873U - Rod and rod joint - Google Patents

Abstract

An object of the present invention is to provide a rod and a rod joint that can prevent a break in a connecting portion when a rotational load is applied and that can effectively use a rod forming material. A rod joint (1) is a rod joint for connecting rods, and has columnar portions (10, 10) at both ends in the axial direction, and a seat having a larger diameter than the columnar portions (10, 10) at a central portion. It has a surface portion 12, and at least one of the columnar portions 10 has external thread portions 11A and 11B on the outer peripheral surface. [Selection diagram] Fig. 1

Description

  The present invention relates to a rod and a rod joint for connecting the rods.

  The rod according to the present invention is, for example, a rod that penetrates into the ground during ground investigation. Here, as an example of the ground survey method, there is a method based on a Swedish sounding test defined in the JIS standard. As shown in FIG. 5, the test method is such that a solid rod 103 made of iron or stainless steel having a digging screw member (screw point) 101 attached to the lower end is vertically projected to the ground G, and the solid rod 103 A clamp 102 and a handle 105 are attached to the upper part of the head. Next, a plurality of disk-shaped weights 104 are sequentially placed on the clamp 102, and the sinking of the solid rod 103 is observed and recorded. At this time, when the solid rod 103 does not sink at the stage where all the weights 104 having a predetermined load are placed, the solid rod 103 sinks by 25 [cm] by being rotated by the handle 105. Record the number of rotations required for Since the maximum length of the solid rod 103 is 1 [m], as shown in FIG. 5, a plurality of additional solid rods 103a are added to advance to a predetermined seismic intensity (usually 10 [m] underground). .

  As an example of a groundwater level measuring apparatus that can measure the groundwater level simultaneously with the Swedish sounding test, a technique described in Patent Document 1 has been proposed. As shown in FIG. 6, this groundwater level measuring device is a groundwater level measuring device equipped with a hollow rod 201 having a digging screw member (not shown) at the front end and a digging means at the rear end. Is configured by connecting a plurality of additional hollow rods 201a via hollow connecting members (rod joints) 202, respectively. Further, the connecting member 202 is formed so that the inner diameter d1 is the same as the inner diameter d1 of the added hollow rod 201a, and a male screw part 221 is provided on the outer periphery of the central part. Each of the additional hollow rods 201a includes an abutting portion 201b capable of abutting one end portion of the connecting member 202 on an inner periphery of at least one end portion, and a female screw portion 201c into which the male screw portion 221 is screwed. Is provided. 6A is a front view (cross-sectional view) in a disconnected state, FIG. 6B is a front view (cross-sectional view) in a connected state, and FIG. 6C is FIG. 6B. FIG.

Utility Model Registration No. 3155815

  Here, as exemplified in the device used in the Swedish sounding test, in a device that applies a rotational load to a plurality of rods connected using a rod joint (connecting member), The subject that the connection part with a rod joint fractures has arisen.

  The present invention has been made in view of the above circumstances, and provides a rod and a rod joint that can prevent breakage in a connecting portion and can effectively use a rod forming material when a rotational load is applied. For the purpose.

  The present invention solves the above-mentioned problems by the solving means described below.

  The disclosed rod joint is a rod joint for connecting rods, and has columnar portions at both end portions in the axial direction, and has a seat surface portion having a diameter larger than that of the columnar portion at the center portion, and at least one of the above-described rod joints The columnar part has an external thread part on the outer peripheral surface. According to this, generation | occurrence | production of the fracture | rupture in the connection part of a rod and a rod joint can be prevented.

  Further, the seat surface portion has a seat surface with which the end surface of the rod abuts on both sides in the axial direction, and the space between the seat surfaces is formed with a predetermined thickness. According to this, it becomes possible to use effectively the steel material used as the material of a rod.

  Moreover, the said seat surface part has a chamfering part parallel to each other in an outer peripheral surface, It is characterized by the above-mentioned. According to this, it becomes possible to rotate or prevent the rod joint from rotating with respect to the rod.

  The disclosed rod has a groove at the end in the axial direction, and the columnar portion of the rod joint can be fitted into the groove. According to this, the rod joint can be connected to the end portion of the rod, and a connecting rod having a required length can be obtained using a plurality of rods.

  Further, the groove portion is formed so that the seat surface of the seat surface portion of the rod joint contacts the end surface of the rod in a state where the rod joint and the rod are fitted. According to this, generation | occurrence | production of the fracture | rupture in the connection part of a rod and a rod joint can be prevented.

  Further, the groove part has an internal thread part on an inner peripheral surface, and the external thread part of the rod joint can be screwed into the internal thread part. According to this, a rod joint can be connected and fixed to a rod.

  Alternatively, the rod joint is fitted to the rod, and the seat surface portion of the rod joint is welded to the end of the rod. Also by this, a rod joint can be connected and fixed to a rod.

  The total length of the total length of the rod and the thickness of the seat surface portion of the rod joint is formed to be 800 to 1000 mm. According to this, it becomes possible to use effectively the steel material used as the material of a rod.

  According to the present invention, when a rotational load is applied with the central axis as a rotation axis, it is possible to prevent breakage at the connecting portion of the rod with the rod joint. Moreover, it becomes possible to use effectively the steel material used as the material of a rod.

It is the schematic which shows the example of the rod joint which concerns on 1st embodiment of this invention. FIG. 2 is a schematic view showing a state in which the rod joint of FIG. 1 is connected to the rod according to the first embodiment of the present invention. It is the schematic which shows the example of the rod joint which concerns on 2nd embodiment of this invention. It is the schematic which shows the state by which the rod joint of FIG. 3 was connected with the rod which concerns on 2nd embodiment of this invention. It is explanatory drawing for demonstrating the test method by a Swedish sounding test. It is the schematic which shows the example of the rod and rod joint in the groundwater level measuring apparatus which concerns on the conventional embodiment. It is explanatory drawing for demonstrating the subject of the rod shown in FIG. 6, and a rod joint.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Here, the case of a Swedish sounding test apparatus as shown in FIG. 5 as an apparatus including the rod joint 1 and the rod 2 according to the present embodiment will be described as an example.

(First embodiment)
A side view of the rod joint 1 according to the first embodiment of the present invention is shown in FIG. 1 (a), and a front view is shown in FIG. 1 (b). Moreover, the schematic of the state with which the rod joint 1 and the rod 2 were connected is shown in FIG. Note that components having the same function are denoted by the same reference symbols throughout the drawings for describing the embodiments, and the repetitive description thereof may be omitted. In this application, “the axial direction of the rod joint 1” means “longitudinal direction of the rod joint 1 (center axis)”, and “the axial direction of the rod 2” means “the central axis of the rod 2”. ) Longitudinal direction ”.

  The rod joint 1 is a connecting member for connecting one rod to another rod. As shown in FIGS. 1 (a) and 1 (b), both end portions in the axial direction have small diameter columnar portions 10 and 10, and a central portion has a large diameter seat surface portion 12. Here, the small diameter means a relatively small diameter, and specifically means a small diameter with respect to the outer diameter of the seat surface portion 12. Similarly, the large diameter means a relatively large diameter, and specifically means a large diameter with respect to the outer diameter of the columnar portion 10. In addition, although the columnar part 10 in this embodiment is a hollow cylindrical shape, it is not limited to this, It can also be considered as a solid, and it can also be considered as a prismatic shape.

  Moreover, the columnar parts 10 and 10 in this embodiment have external thread parts 11A and 11B on the outer peripheral surface. Here, the male screw portions 11A and 11B are both formed in a normal screw shape or in a reverse screw shape. As a result, the rotational force can be transmitted while being connected to the rod 2. In addition, the rod joint 1 in this embodiment is an example in the case of a hollow structure. According to this, it becomes possible to arrange | position a cable, a sensor, etc. (not shown) inside by connecting with the rod 2 of a hollow structure. As a modification, a solid structure may be considered (not shown).

  As a characteristic configuration of the present embodiment, the seat surface portion 12 of the rod joint 1 has seat surfaces 12a and 12b with which the end surfaces of the rods 2 to be connected abut on both sides in the axial direction. The thickness between 12b is formed to a predetermined thickness L1. The predetermined thickness L1 is preferably formed to be equal to or longer than the length of the cutting scissors when the rod 2 is cut from a long member.

  For example, if a rod 2 having a length of 1 [m] is formed by cutting a hollow cylindrical steel material having a length of 1 [m], at least 2 to 3 [mm] is required as a cutting scissors. Only three rods 2 of m] can be formed, and the utilization efficiency of the steel material will be extremely poor. On the other hand, as shown in FIG. 2, for example, if the predetermined thickness of the seat surface portion 12 is L1 = 10 [mm] and the total length of the rod 2 is L2 = 990 [mm], the total length L2 of the rod 2 The total length L with the thickness L1 of the seating surface portion of the rod joint is L = 1000 [mm] (= 1 [m]). That is, four 990 [mm] rods 2 can be formed from a hollow cylindrical steel material of 4 [m], and by connecting the rod 2 and the rod joint 1 of L1 = 10 [mm], the total length It can be configured as a rod part of 1 [m]. Therefore, it becomes possible to use the steel material used as a material very effectively. The numerical values of L1, L2, and L are examples, and are not limited thereto. Considering the case of a Swedish sounding test apparatus, L = 800 to 1000 [mm] is preferable.

  Further, the seat surface portion 12 of the rod joint 1 is provided with chamfered portions parallel to each other on the outer peripheral surface. In the present embodiment, two parallel surfaces (the chamfered portion 12c and the chamfered portion 12d) are provided, and according to this, the seat surface portion 12, that is, the rod joint 1 is sandwiched by a general-purpose tool (spanner, wrench, etc.). Can be rotated (or prevented from rotating). As a modified example of the chamfered portion, it may be possible to form the chamfered portion such as a square cross section, a hexagonal cross section (not shown).

  On the other hand, the rod 2 which concerns on 1st embodiment of this invention has the groove parts 22 and 22 in the edge part of an axial direction, as shown in FIG. According to this, the columnar part 10 of the rod joint 1 can be fitted into the groove part 22.

  Moreover, the groove parts 22 and 22 in this embodiment have internal thread part 21A, 21B in an internal peripheral surface. Note that FIG. 2 shows an example in which a female screw portion is provided at both ends of the rod 2, but it is also conceivable that the end portion to which the rod joint 1 is not connected has no female screw portion. (Not shown).

  Here, the female screw portions 21A and 21B of the rod 2 are formed with a diameter, a pitch, and the like so that the male screw portions 11A and 11B of the rod joint 1 can be screwed together. As a result, as shown in FIG. 2, the rod joint 1 can be connected to the end of the rod 2. At this time, the female screw portions 21A and 21B are formed in the groove portion 22 having a depth at which the tip portion of the rod joint 1 (male screw portions 11A and 11B) does not contact the bottom portion 22a in the axial direction. As a result, the seat surface (12a in FIG. 2) of the seat surface portion 12 of the rod joint 1 can be brought into contact with the end surface (2a in FIG. 2) of the rod 2. According to this configuration, it is possible to solve the problem of breakage that has occurred in conventional rods and rod joints.

  More specifically, as shown in FIG. 7 which is a partially enlarged view of FIG. 5, a conventional hollow rod 201 (201a) and a hollow connecting member (rod joint) 202 for connecting the same have a central axis as a rotation axis. When a rotational load is applied, the rod joint 202 is screwed into the hollow rod 201 (201a). As a result, since the tip of the rod joint 202 abuts against the bottom of the groove of the hollow rod 201 (201a) in the axial direction, stress is generated at the connecting portion (particularly, the portion surrounded by a round frame in FIG. 7) and breakage occurs. Will occur.

  On the other hand, according to the connection structure using the rod joint 1 and the rod 2 according to the present embodiment, the seating surface (12a in FIG. 2) of the seating surface portion 12 of the rod joint 1 is the end surface of the rod 2 (FIG. 2a) and the tip of the rod joint 1 (male threaded portion 11A, 11B) does not contact the bottom portion 22a in the groove portion 22 in the axial direction. Breakage at the same position in the axial direction with respect to the bottom portion 22a of the rod 2 and in the vicinity thereof can be prevented.

  Furthermore, the rod 2 is formed in a total length L2 such that the total length L with the thickness L1 of the seat surface portion 12 of the rod joint 1 is 800 to 1000 [mm]. 4 [m] etc.) can be used efficiently without wasting hollow cylindrical steel materials (or solid cylindrical steel materials). Accordingly, the manufacturing cost can be greatly reduced.

(Second embodiment)
Then, the rod joint 1 and the rod 2 which concern on 2nd embodiment of this invention are demonstrated. Since the basic configuration of the rod joint 1 and the rod 2 according to the second embodiment is the same as that of the first embodiment described above, differences will be mainly described.

  A side view of the rod joint 1 according to the second embodiment of the present invention is shown in FIG. 3 (a), and a front view is shown in FIG. 3 (b). Moreover, the schematic of the state with which the rod joint 1 and the rod 2 were connected is shown in FIG.

  3 (a) and 3 (b), the rod joint 1 according to the present embodiment has small-diameter columnar portions 10 and 10 at both ends in the axial direction, and a large-diameter seating surface portion at the center portion. However, unlike the first embodiment described above, a male screw portion 11 is provided on the outer peripheral surface of one columnar portion 10 and a male screw portion is provided on the outer peripheral surface of the other columnar portion 10. This is an unstructured configuration. Although the columnar part 10 has a hollow cylindrical shape, it is not limited to this, as described above, and may be solid, or may be a prismatic shape.

  On the other hand, as shown in FIG. 4, the rod 2 according to the present embodiment has groove portions 22, 22 at the end in the axial direction, but unlike the first embodiment described above, A female screw portion 21 is provided on the peripheral surface, and a female screw portion is not provided on the inner peripheral surface of the other groove portion 22.

  According to this, the columnar part 10 in which the male thread part of the rod joint 1 is not provided can be inserted and fitted into the groove part 22 in which the female thread part is not provided. FIG. 4 shows an example in which a groove portion is provided at both ends of the rod 2, but the end portion to which the rod joint 1 is not connected may be configured not to have a groove portion (not shown). .

  In the present embodiment, as shown in FIG. 4, the rod surface is such that the seat surface (12 a in FIG. 4) of the seat surface portion 12 of the rod joint 1 abuts the end surface (2 a in FIG. 4) of the rod 2. The joint 1 and the rod 2 are fitted. Furthermore, in the said fitting state, the said seat surface part 12 and the edge part of the said rod 2 can be welded, and the rod joint 1 and the rod 2 can be fixed, and a rod (rod component in the said fixed state) (The welded portion is indicated by a symbol W in FIG. 4). In the present embodiment, chamfering is performed on the ends of the rod joint 1 and the rod 2 in order to perform welding (see FIG. 4).

  Therefore, the male screw portion 11 of one rod (rod component) configured as the fixed state and the female screw portion 21 of the other rod (rod component) configured as the fixed state are combined. By doing so, the rods (rod parts) can be connected to each other. Thus, a connecting rod having a required length can be obtained by appropriately connecting a plurality of the rods (rod parts).

  In the present embodiment, as in the first embodiment described above, the rod 2 has a total length L of 800 to 1000 [mm] with the thickness L1 of the seating surface portion 12 of the rod joint 1. It is preferable to form the entire length L2.

  According to this configuration, similar to the first embodiment described above, it is possible to solve the problem of breakage that has occurred in the conventional rod and rod joint, and it is possible to effectively use the steel material that is the material of the rod. It becomes.

  As described above, according to the disclosed rod and rod joint, it is possible to prevent the breakage at the connecting portion between the rod and the rod joint. Moreover, it becomes possible to use effectively the steel material used as the material of a rod.

  Needless to say, the present invention is not limited to the embodiments described above, and various modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Rod joint 2 Rod 10 Column-shaped part 11, 11A, 11B Male thread part 12 Seat surface part 12a, 12b Seat surface 12c, 12d Chamfer part 21, 21A, 21B Female thread part 22 Groove part

Claims (8)

A rod joint for connecting rods,
While having a columnar part at both ends in the axial direction, it has a seat surface part having a diameter larger than that of the columnar part at the center part,
At least one of the columnar portions has a male screw portion on an outer peripheral surface thereof. The seat surface portion has a seat surface with which the end surface of the rod abuts on both sides in the axial direction,
The rod joint according to claim 1, wherein the space between the seating surfaces is formed to a predetermined thickness. The rod joint according to claim 1, wherein the seat surface portion has chamfered portions parallel to each other on an outer peripheral surface. Has a groove at the end in the axial direction,
The rod-shaped part of the rod joint as described in any one of Claims 1-3 can be fitted in the said groove part, The rod characterized by the above-mentioned. 5. The groove portion is formed so that a seat surface of the seat surface portion of the rod joint comes into contact with an end surface of the rod in a state where the rod joint and the rod are fitted. The described rod. The groove has an internal thread on the inner peripheral surface,
The rod according to claim 5, wherein a male screw portion of the rod joint is screwable with the female screw portion. The rod according to claim 5, wherein the rod joint is fitted to the rod, and a seat surface portion of the rod joint is welded to an end portion of the rod. The rod according to any one of claims 4 to 7, wherein the total length of the total length of the rod and the thickness of the seating surface portion of the rod joint is 800 to 1000 mm. .

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