Connection structure of survey stake

Abstract

To provide a connection structure of survey stakes allowing a user to easily connect / separate two survey stakes, being difficult to separate even when force is suddenly applied when the survey stakes are driven into the ground for use, and being easily installed at a low cost.SOLUTION: A connector 1 connects two rod-shaped survey stakes 10 arranged side by side in the longitudinal direction, each of which is comprised of a pair of side walls 11 extending continuously in an L-shaped cross section from a tip 10a to a head 10b. The connector 1 includes a second fitting part 9 detachably fitted to the head 10b of one survey stake 10, and a first fitting part 8 detachably fitted to the tip 10a of the other survey stake 10. The first fitting part 8 includes a pair of orthogonally-arranged first wall parts 3 for respectively positioning the respective side walls 11.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a structure for connecting surveying piles driven into the ground as marks for the pile erection positions of utility poles in utility pole replacement work.

Background Art

[0002] Conventionally, when performing utility pole replacement work, after surveying the pile erection position of the utility pole, a surveying pile is driven into that position to serve as a mark for the pile erector who performs the pile erection work. As the surveying pile serving as the mark, what is generally called a so-called red-crowned pile is commonly used. This surveying pile has a rod shape with an L-shaped cross section having a length of about 30 cm from the tip to the head, the head is colored red, and the other parts are colored white. By the way, when the surveying pile driven into the ground as described above is in a place where the grass grows thickly at the pile erection position, the grass is originally thick, or after driving the surveying pile into the ground, if there is time until the pile erection work and the grass that grows thickly grows large, there is a risk that the pile erector cannot find it because it is buried by those grasses during the pile erection work.

[0003] In order to avoid this, for example, it is conceivable to connect the tips of two other surveying piles in the longitudinal direction so that two of them are aligned on the head of the surveying pile driven into the ground, thereby increasing the height from the ground to make it stand out as a mark. And as a structure for connecting these two surveying piles, for example, it is conceivable to adopt the pile connecting structure disclosed in Patent Document 1. Patent Document 1 discloses a short cylindrical member with a circular cross section for connecting two piles. This cylindrical member has an annular groove with a concave cross section formed at each opening peripheral portion, and a cylindrical pile is fitted into each annular groove, and a locking member is passed through each fitting portion in the pipe diameter direction to connect and lock the cylindrical member and each pile.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

[0005] However, in the case of the structure of Patent Document 1, after fitting two piles into each tubular member, the tubular member and each pile are connected and locked with a locking member, which not only makes the work complicated but also increases the number of parts, which may increase costs. Also, when connecting and locking two piles with a locking member, if the locking member is not designed to be detachable from the two piles, it will be difficult to transport and handle the two piles when they are reused in another location. In order to avoid this, it is conceivable to eliminate the locking member and instead fit the two piles into the cylindrical member so that they can be connected and separated. However, in the structure of Patent Document 1, the two piles are cylindrical, and the tubular member connecting the two piles also has a circular cross-section. Therefore, if force is suddenly applied to the two piles when they are connected and driven into the ground, the upper pile may rotate relative to the lower pile around the center line of the tubular member, causing the connection between the two piles to be released, and the piles may no longer function as a marker.

[0006] The present invention has been made in consideration of the above points, and its purpose is to provide a survey pile connecting structure that allows two survey piles to be easily connected and separated, and that is difficult to separate even if an unexpected force is applied when the survey piles are driven into the ground for use, and that is low-cost and easy to install. [Means for solving the problem]

[0007] In order to achieve the above-mentioned object, the present invention is characterized by a structure that, when two survey piles are connected and used, can prevent the upper survey pile from rotating around its center line relative to the lower survey pile.

[0008] Specifically, it is a rod-shaped structure composed of a pair of side walls that are continuously L-shaped in cross-section from the tip to the head. The tip is a sharp-tipped surveying pile with a triangular shape that narrows in width as each side wall approaches the other side towards the tip. A connecting structure for two surveying piles arranged longitudinally and connectable is the object, and the following measures were taken.

[0009] That is, in the connecting structure of the surveying pile according to the first invention, a first fitting portion is provided that is detachable from or integrally provided on the head of the one surveying pile, and is capable of fitting the tip of the other surveying pile so that the other surveying pile extends on the opposite side of the one surveying pile. The first fitting portion is characterized in that a pair of positioning wall portions arranged orthogonally for positioning each side wall are provided. In the connecting structure of the surveying pile configured in this way, even if an unexpected force is applied to the upper surveying pile during use, each positioning wall portion acts to prevent the upper surveying pile from rotating with respect to the lower surveying pile. Also, while it is possible to increase the height from the ground to make it more conspicuous as a landmark, it also acts so that it is possible to pull out the tip of the surveying pile from the first fitting portion and separate the two surveying piles.

[0010] In the connecting structure of the surveying pile of the second invention, in the first invention, a connecting tool is provided that includes the first fitting portion and a second fitting portion that is arranged in parallel with the first fitting portion, opens on the opposite side of the first fitting portion, and is detachably fitted to the head of the one surveying pile. In the connecting structure of the surveying pile configured in this way, the structure for connecting the two surveying piles acts so as not to be integrally provided on the two surveying piles.

[0011] In the connecting structure of the surveying pile of the third invention, in the first or second invention, the first fitting portion is characterized by having an inclined bottom surface that extends inclined corresponding to the tip surface of the surveying pile. In the connecting structure of the surveying piles configured in this way, when an unexpected force is applied to the upper surveying pile during use, the frictional resistance between the tip surface of the tip of the upper surveying pile and the inclined bottom surface of the first fitting portion of the lower surveying pile acts so as to increase in the circumferential direction centered on the center lines of both surveying piles.

[0012] In the connecting structure of the surveying piles of the fourth invention, in the second invention, an urging portion for applying an urging force to the surveying pile that fits into the first fitting portion or the second fitting portion in the plate thickness direction of the side wall of the surveying pile is provided on the peripheral wall of the connecting tool. In the connecting structure of the surveying piles configured in this way, when an unexpected force is applied to the upper surveying pile during use, the frictional resistance between the surveying pile and the connecting tool acts so as to increase in the direction of the center line of the surveying pile.

[0013] In the connecting structure of the surveying piles of the fifth invention, in the fourth invention, the connecting tool is formed of a flexible resin material, and the urging portion is a tongue piece portion formed by notching the side wall of the connecting tool in a U shape. In the connecting structure of the surveying piles configured in this way, it acts so that separation of the upper surveying pile from the lower surveying pile during use can be avoided with a simple structure.

Effect of the Invention

[0014] In the connecting structure of the surveying pile of the first invention, even if a force is unexpectedly applied to the upper surveying pile during use, each positioning wall portion prevents the upper surveying pile from rotating with respect to the lower surveying pile. Therefore, it becomes difficult for the two surveying piles to separate during use, and it is possible to avoid the situation where they can no longer serve as a mark. In addition, when the tip of the surveying pile is fitted into the first fitting portion, it is possible to increase the height from the ground and make it more conspicuous as a mark. On the other hand, it is also possible to pull out the tip of the surveying pile from the first fitting portion to separate the two surveying piles, so that the two surveying piles can be easily carried when reused at another location. Furthermore, since it is not a structure in which two surveying piles are connected and locked using a locking member such as Patent Document 1, it is possible to make a low-cost connecting structure that is easy to install and handle the surveying piles at the site.

[0015] In the connecting structure of the surveying pile of the second invention, since the structure for connecting the two surveying piles is not integrally provided on the two surveying piles, each surveying pile can be of a simple structure that has existed conventionally.

[0016] In the connecting structure of the surveying pile of the third invention, when a force is unexpectedly applied to the upper surveying pile during use, the frictional resistance between the tip surface of the tip of the upper surveying pile and the inclined bottom surface of the first fitting portion of the lower surveying pile increases in the circumferential direction centered on the center lines of both surveying piles. Therefore, even if a force is unexpectedly applied to the upper surveying pile, it becomes more difficult for the upper surveying pile to rotate with respect to the lower surveying pile, and it is possible to further prevent the separation of the two surveying piles during use.

[0017] In the connecting structure of the surveying pile of the fourth invention, when a force is unexpectedly applied to the upper surveying pile during use, the frictional resistance between the surveying pile and the connector increases in the direction of the center lines of both surveying piles. Therefore, even if a force is unexpectedly applied to the upper surveying pile, the force in the pulling-out direction of the upper surveying pile with respect to the lower surveying pile becomes small, and it is possible to surely avoid the separation of the two surveying piles during use.

[0018] In the connecting structure of the surveying piles according to the fifth invention, separation of the upper surveying pile from the lower surveying pile during use can be avoided with a simple structure, so that a low-cost connecting structure can be achieved.

Brief Description of the Drawings

[0019] [Figure 1] It is a front view showing a state in which two surveying piles are connected and used with the connector according to Embodiment 1 of the present invention. [Diagram 2] It is a perspective view showing the connector according to Embodiment 1 of the present invention and two surveying piles connected by the connector, respectively. [Figure 3] It is a view taken along arrow III in FIG. 2. [Figure 4] It is a cross-sectional view taken along line IV-IV in FIG. 3. [Figure 5] It is a cross-sectional view taken along line V-V in FIG. 3. [Figure 6] It is a cross-sectional view taken along line VI-VI in FIG. 3. [Figure 7] It is a view corresponding to FIG. 1 according to Embodiment 2 of the present invention. [Figure 8] It is a view corresponding to FIG. 2 according to Embodiment 2 of the present invention. [Figure 9] It is a view taken along arrow IX in FIG. 8. [Figure 10] It is a cross-sectional view taken along line X-X in FIG. 9. [Figure 11] It is a cross-sectional view taken along line XI-XI in FIG. 10.

Modes for Carrying Out the Invention

[0020] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiments is merely illustrative in nature.

Embodiment

[0021] Fig. 1 shows two survey stakes 10 connected together using a connector 1 (connection structure) according to a first embodiment of the present invention. The survey stake 10 is driven into the ground G as a marker for the pole position P during utility pole replacement work, and as shown in Fig. 2, is rod-shaped and made up of a pair of side walls 11 that form an L-shaped cross section from the tip 10a to the head 10b. The tip 10a of the survey stake 10 has a pointed triangular structure in which each side wall 11 narrows toward the other end, and the tip surfaces 11a of the tip 10a of each side wall 11 are inclined.

[0022] 2 and 3, the connector 1 includes a tool body 2 made of a flexible resin material and having a generally triangular cylindrical shape. The tool body 2 includes a pair of first walls 3 (positioning walls) each having a rectangular plate shape and arranged orthogonally so as to be continuous at one edge, a pair of second walls 4 each having a strip shape with one edge continuing to the other edge of each of the first walls 3, and a third wall 5 having a rectangular plate shape that connects the other edges of the second walls 4, with the third wall 5 arranged to extend obliquely relative to both first walls 3.

[0023] On the other hand, in the central portion near the upper end and the central portion near the lower end of the first wall portion 3, a pair of tongue portions 3a (spring portions) consisting of the inner portion formed by cutting out the first wall portion 3 in a U-shape are provided symmetrically in the vertical direction, and each tongue portion 3a has a stepped shape that extends into the inside of the tool body 2, as shown in Figure 6.

[0024] As shown in Figures 3 to 5, inside the tool body 2, there are provided a pair of first resin abutment members 6 against which the tip 10a of the survey pile 10 abuts when the tip 10a side of the survey pile 10 is inserted from the tip 10a side through one end opening of the tool body 2, and a pair of second resin abutment members 7 against which the head 10b of the survey pile 10 abuts when the head 10b side of the survey pile 10 is inserted from the head 10b side through the other end opening of the tool body 2.

[0025] Each first abutting member 6 has a substantially square bar shape and is fixed to the inner surface of each first wall portion 3. The first abutting members 6 are arranged such that their one ends approach each other and are inclined and extend so as to approach the one-end opening of the tool body 2 while being spaced apart from each other from one end to the other end. And the one-end opening side of each first abutting member 6 in the tool body 2 is an inclined bottom surface 6a that is inclined and extends so as to correspond to the tip surface 11a of each side wall 11 of the surveying pile 10.

[0026] Each second abutting member 7 has a substantially square bar shape and is fixed to the inner surface of each first wall portion 3. Each second abutting member 7 is located on the other-end opening side of the tool body 2 with respect to each first abutting member 6, and their one ends approach each other and extend in a direction perpendicular to the center line of the tool body 2 from one end to the other end.

[0027] The region including both first abutting members 6 on approximately the half of the one-end opening side of the tool body 2 constitutes the first fitting portion 8 of the present invention, and the tip portion 10a of the surveying pile 10 can be detachably fitted from the one-end opening of the tool body 2 by fitting in the first fitting portion 8. When the tip portion 10a of the surveying pile 10 is fitted in the first fitting portion 8, the first wall portions 3 arranged orthogonally position the side walls 11 of the surveying pile 10. Further, the tip surfaces 11a of the fitted surveying pile 10 respectively abut against the inclined bottom surfaces 6a of the first abutting members 6. Furthermore, a tongue piece portion 3a located on the first fitting portion 8 side applies a biasing force in the plate thickness direction of the side wall 11 of the surveying pile 10 fitted in the first fitting portion 8.

[0028] On one hand, the region including both the second abutting members 7 on the approximately half of the other end opening side of the tool body 2 constitutes the second fitting portion 9 of the present invention. That is, the second fitting portion 9 is arranged parallel to the first fitting portion 8 and opens on the side opposite to the first fitting portion 8. The head 10b of the surveying pile 10 can be detachably fitted through the other end opening of the tool body 2. When the head 10b of the surveying pile 10 is fitted into the second fitting portion 9, each of the first wall portions 3 arranged orthogonally positions each side wall 11 of the surveying pile 10. Further, each side wall 11 of the head 10b of the fitted surveying pile 10 abuts against each of the second abutting members 7. Furthermore, the tongue piece portion 3a located on the side of the second fitting portion 9 applies a biasing force in the plate thickness direction of the side wall 11 of the surveying pile 10 fitted into the second fitting portion 9.

[0029] That is, when the tip 10a of the other surveying pile 10 is fitted into the first fitting portion 8 with the head 10b of one of the two surveying piles 10 attached to the second fitting portion 9, the other surveying pile 10 extends to the side opposite to the one surveying pile 10, and as shown in FIG. 1, the two surveying piles 10 can be stood on the ground G in a state of being longitudinally connected.

[0030] As described above, according to the first embodiment of the present invention, even if an unexpected force is applied to the upper surveying pile 10 during the use of connecting the two surveying piles 10 with the connector 1, the pair of first wall portions 3 prevent the upper surveying pile 10 from rotating with respect to the lower surveying pile 10. Therefore, it becomes difficult for the two surveying piles 10 to separate during use, and it is possible to avoid the situation where they can no longer serve as a landmark.

[0031] In addition, when the tip of the surveying pile 10 is fitted into the first fitting portion 8 of the coupler 1, it is possible to raise the height from the ground G to make it prominent as a landmark. On the other hand, since the tip of the surveying pile 10 can be pulled out from the first fitting portion 8 to separate the two surveying piles 10, it is possible to make it easier to carry when the two surveying piles 10 are reused at another location. Furthermore, since it does not have a structure in which two surveying piles 10 are connected and locked using a locking member such as in Patent Document 1, it is possible to achieve a low-cost connection structure that is easy to install and handle the surveying piles 10 at the site.

[0032] Also, two surveying piles 10 are connected using a coupler 1 that is separate from each surveying pile 10, and since the structure for connecting the two surveying piles 10 is not integrally provided on the two surveying piles 10, each surveying pile 10 used as a landmark can be of a simple structure that has existed conventionally.

[0033] Further, since the first fitting portion 8 is provided with an inclined bottom surface 6a that extends obliquely corresponding to each tip surface 11a of the surveying pile 10, when an unexpected force is applied to the upper surveying pile 10 during use, the frictional resistance between the tip surface 11a of the upper surveying pile 10 and the inclined bottom surface 6a of the first fitting portion 8 of the lower surveying pile 10 increases in the circumferential direction centered on the center line of both surveying piles 10. Therefore, even if an unexpected force is applied to the upper surveying pile 10, it becomes more difficult for the upper surveying pile 10 to rotate with respect to the lower surveying pile 10, and it is possible to further make it difficult for the two surveying piles 10 to separate during use.

[0034] Also, on the side wall of the coupler 1, there is provided a tongue piece portion 3a that applies a biasing force in the plate thickness direction of the side wall 11 of each surveying pile 10 that fits into the first fitting portion 8 and the second fitting portion 9. Therefore, when an unexpected force is applied to the upper surveying pile 10 during use, the frictional resistance between the surveying pile 10 and the coupler 1 increases in the center line direction of both surveying piles 10. Therefore, even if an unexpected force is applied to the upper surveying pile 10, the pulling force of the upper surveying pile 10 with respect to the lower surveying pile 10 becomes small, and it is possible to surely avoid the separation of the two surveying piles 10 during use.

[0035] Furthermore, since the tongue piece portion 3a is constituted by an inner portion formed by notching a part of the first wall portion 3 made of a flexible resin material in a U shape, separation of the upper survey stake 10 from the lower survey stake 10 during use can be avoided with a simple structure. Therefore, a low-cost connection structure can be achieved.

[0036] In addition, in the first embodiment of the present invention, the first contact member 6 is a member having a substantially square bar shape. However, as long as the tip portion 10a of the survey stake 10 that fits into the first fitting portion 8 comes into contact, other shapes may be used. For example, a member having a triangular plate shape that fills the space between the first contact member 6 and the second contact member 7 may be used.

[0037] Also, in the first embodiment of the present invention, the first contact member 6 and the second contact member 7 are provided inside the tool body 2. However, the first contact member 6 and the second contact member 7 may not be provided inside the tool body 2, and a structure may be adopted in which the space between the first fitting portion 8 and the second fitting portion 9 is simply partitioned by a partition plate.

[0038] In addition, in the first embodiment of the present invention, the tool body 2, the first contact member 6, and the second contact member 7 are formed of a resin material, but they may be formed of a metal material.

[0039] Also, in the first embodiment of the present invention, the tongue piece portion 3a formed of a flexible resin material applies a biasing force to the side wall 11 of the survey stake 10 in its plate thickness direction. However, for example, an elastic member such as a rubber material may be attached to the inner surface of the tool body 2 to apply a biasing force to the side wall 11 of the survey stake 10 that fits into the first fitting portion 8 or the second fitting portion 9 in its plate thickness direction.

Embodiment

[0040] FIGS. 7 and 8 show the connection structure 1A of the survey stake 10 according to the second embodiment of the present invention. In this second embodiment, there is no connector 1 as in the first embodiment, and the structure of the head portion 10b of each survey stake 10 is different from that of the first embodiment. Therefore, the same reference numerals are given to the same parts as in the first embodiment, and only the different parts will be described.

[0041] The survey pile 10 of Example 2 has a connecting structure 1A integrally molded on the head 10b for connecting other survey piles 10. That is, the first wall 3 of Example 2 is formed by an area of each side wall 11 corresponding to the head 10b, and is wider than the other areas of the side walls 11 of Example 2. The third wall 5 of Example 2 has an L-shaped cross section extending from both first wall parts 3 at a predetermined interval so as to correspond to both first wall parts 3. The first fitting part 8 of Example 2 has a recessed portion that opens in an L-shape in plan view, where the tip part 10a of the other survey pile 10 is inserted. When the tip part 10a of the other survey pile 10 is fitted into the first fitting part 8, the abutting part 6b has an inclined bottom surface 6a against which the tip surface 11a of the tip part 10a abuts. The abutting part 6b is integrally molded with the first wall part 3, the second wall part 4, and the third wall part 5, as shown in FIGS. 9 to 11 .

[0042] As described above, according to the second embodiment of the present invention, there is no need to carry the connecting device 1, which is configured separately from the survey pile 10 as in the first embodiment, to the erection position, so that the connecting structure 1A of the survey pile 10 can be made easy to carry to the work site and easy to handle.

[0043] In the second embodiment of the present invention, the first wall 3 may also be provided with the tongue portion 3a as in the first embodiment. In the second embodiment, the tongue portion 3a may also be provided on the third wall 5.

[0044] Furthermore, in the first and second embodiments of the present invention, two survey stakes 10 are connected together, but by using the connecting structure of the present invention (connector 1, connecting structure 1A), three or more survey stakes 10 can also be connected together. [Industrial Applicability]

[0045] The present invention is suitable for a structure for connecting survey stakes that are driven into the ground as markers for the erection position of utility poles during utility pole replacement work. [Explanation of symbols]

[0046] 1... Connecting tool (connection structure) 1A... Connection structure 2... Tool body 3... First wall portion 3a... Tongue piece portion 4... Second wall portion 5... Third wall portion 6... First abutting member 6a... Inclined bottom surface 6b... Abutting portion 7... Second abutting member 8... First fitting portion 9... Second fitting portion 10... Measuring pile 10a... Tip portion 10b... Head portion 11... Side wall 11a... Front end surface 11a G... Ground surface P... Building column position

Claims

1. A connecting structure of surveying piles, which is formed by a pair of side walls that are continuously L-shaped in cross-section from the tip to the head, and the tip is a sharp-tipped surveying pile with a triangular shape that narrows in width so that each side wall approaches the other as it goes to the tip. Two surveying piles are arranged side by side in the longitudinal direction and can be connected. A first fitting portion is provided on the head of one of the surveying piles, which can be detachably attached or integrally provided, and can fit the tip of the other surveying pile so that the other surveying pile extends to the opposite side of the one surveying pile. The connecting structure of the surveying pile is characterized in that a pair of positioning wall portions arranged orthogonally to position each side wall are provided in the first fitting portion.

2. In the connecting structure of the surveying pile according to Claim 1, It is composed of a connecting tool including the first fitting portion and a second fitting portion that is arranged side by side with the first fitting portion, opens to the opposite side of the first fitting portion, and is detachably fitted to the head of the one surveying pile. The connecting structure of the surveying pile is characterized by this.

3. In the connecting structure of the surveying pile according to Claim 1 or 2, The connecting structure of the surveying pile is characterized in that the first fitting portion has an inclined bottom surface that extends inclined corresponding to the tip surface of the surveying pile.

4. In the connecting structure of the surveying pile according to Claim 2, The connecting structure of the surveying pile is characterized in that a biasing portion that applies a biasing force to the surveying pile fitted to the first fitting portion or the second fitting portion in the plate thickness direction of the side wall of the surveying pile is provided on the peripheral wall of the connecting tool.

5. In the connecting structure of the surveying pile according to Claim 4, The connecting tool is formed of a flexible resin material. The connecting structure of the surveying pile is characterized in that the biasing portion is a tongue piece portion formed by notching the side wall of the connecting tool in a U shape.

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