Wooden stake connector

Abstract

The present invention provides a wooden pile connector that can increase the strength of the connection between wooden piles, and in particular improve the resistance to pulling them out. [Solution] A wooden piling connector comprising a horizontal contact plate 11, an upper shaft 12 erected in the center of the upper surface of the contact plate 11, and a lower shaft 13 erected in the center of the lower surface of the contact plate 11, wherein the upper shaft 12 is conical or frustoconical in shape with a taper that narrows upward, and the lower shaft 13 is conical or frustoconical in shape with a taper that narrows downward, and a spiral upper engagement peak 121 is formed on the outer circumference of the upper shaft 12 in a counterclockwise direction from the end on the contact plate 11 side upward, and a spiral lower engagement peak 131 is formed on the outer circumference of the lower shaft 13 in a clockwise direction from the end on the contact plate 11 side downward,

Description

Technical Field

[0001] The present invention relates to a wooden pile connector for connecting wooden support piles (wood piles).

Background Art

[0002] Conventionally, when reinforcing the ground of structures such as houses with support piles, steel pipe piles and concrete piles have been used as support piles. However, in recent years, in response to environmental issues and global warming issues, for the purpose of reducing greenhouse gas emissions in the construction industry, the demand for wooden support piles (wood piles) that are very inexpensive compared to steel pipe piles and concrete piles, are natural materials, and have a low environmental impact has been increasing. Wood piles not only absorb CO2 during the growth process, but can also significantly reduce CO2 emissions by replacing steel pipe piles and concrete piles, and thus have come to be used for the foundations of small-scale houses.

[0003] Wood piles used as support piles are made of cedar, pine, cypress, etc., and generally have a length of 6 m or less per piece. Therefore, when driving a wood pile deep into the ground, another wood pile is abutted against the upper part of the driven wood pile, pressure is applied to the upper wood pile, and while repeatedly pressing it together with the lower wood pile, it is driven to a predetermined depth. At this time, a rod-shaped connecting material that penetrates the opposing surfaces is inserted between the upper wood pile and the lower wood pile as shown in FIG. 6 to prevent displacement during driving, leading to an improvement in vertical accuracy and construction efficiency. In addition, since there are no protrusions on the peripheral surface of the wood pile, it becomes a support pile that can effectively secure frictional force.

Summary of the Invention

Problems to be Solved by the Invention

[0004] Support piles are driven in succession at predetermined intervals, but conventional methods of connecting wooden piles with rod-shaped connecting members offer little resistance to pull-out. Therefore, in soft ground, the pressure generated within the ground when driving adjacent support piles may cause already driven support piles to float up (Figure 7). Furthermore, if the water level rises temporarily and rapidly due to heavy rain during construction, the buoyancy of the water may cause the support piles to float up.

[0005] When a support pile lifts up, its pile head becomes too high, requiring either re-pressing or cutting the pile head to level it. Such work reduces construction efficiency and leads to increased costs.

[0006] The present invention aims to provide a wooden stake connector that can connect upper and lower wooden stakes while providing resistance to pulling them out. [Means for solving the problem]

[0007] To achieve the above objective, the present invention provides a wooden peg connector comprising a horizontal contact plate, an upper shaft erected in the center of the upper surface of the contact plate, and a lower shaft erected in the center of the lower surface of the contact plate, wherein the upper shaft is conical or frustoconical in shape with a taper that narrows upward, and the lower shaft is conical or frustoconical in shape with a taper that narrows downward, and the outer circumference of the upper shaft has a spiral upper engagement peak formed counterclockwise from the end on the contact plate side upward, and the outer circumference of the lower shaft has a spiral lower engagement peak formed clockwise from the end on the contact plate side downward, thereby providing a wooden peg connector. The upper engagement peak may be formed in a spiral shape of 1 to 1.5 turns over a range of 1 / 3 to 1 / 2 of the length of the upper shaft, and the lower engagement peak may be formed in a spiral shape of 1 to 1.5 turns over a range of 1 / 3 to 1 / 2 of the length of the lower shaft. [Effects of the Invention]

[0008] The present invention, by means of solving the above-mentioned problems, can achieve at least one of the following effects. <1> By connecting wooden piles with wooden pile connectors that have pull-out resistance, it is possible to prevent already driven support piles from floating up when driving adjacent support piles in soft ground. Furthermore, it is possible to prevent support piles from floating up due to buoyancy caused by water in the event of a temporary and rapid rise in water level due to heavy rain during construction. <2> By providing the engaging grooves in a spiral pattern for approximately one to one and a half turns around the circumferential direction of the tapered shaft, the amount of rotation required for the wooden pile connector or the wooden pile itself during penetration can be reduced. <3> By placing a large-section abutment plate in the center in the vertical direction, the amount of penetration into the wooden pile can be kept constant. <4> This can reduce additional work such as re-pressing or cutting the pile heads due to uplift, thereby improving construction efficiency. <5> This will lead to increased use of wooden stakes and contribute to reducing environmental impact. [Brief explanation of the drawing]

[0009] [Figure 1] Explanatory diagram of the wooden stake connector according to the present invention [Figure 2] Figure 2(a) Upper perspective view of the wooden stake connector, Figure 2(b) Lower perspective view of the wooden stake connector [Figure 3] Plan view of wooden stake connector [Figure 4] Diagram illustrating the method of driving wooden piles using wooden pile connectors (1) [Figure 5] Diagram illustrating the method of driving wooden piles using wooden pile connectors (2) [Figure 6] Diagram illustrating the conventional connection of wooden piles (1) [Figure 7] Diagram illustrating the conventional connection of wooden piles (2) [Modes for carrying out the invention]

[0010] Embodiments of the present invention will be described below with reference to the drawings. [Examples]

[0011] <1> Wooden stake connector 1 The pile connector 1 of the present invention is for connecting two piles 2a and 2b (Fig. 1). The pile connector 1 includes a horizontal contact plate 11, an upper shaft 12 erected at the center of the upper surface of the contact plate 11, and a lower shaft 13 erected at the center of the lower surface of the contact plate 11 (Fig. 2). Then, the pile connector 1 connects the piles 2a and 2b by penetrating the upper shaft 12 and the lower shaft 13 into the penetration holes 21a and 21b provided at the centers of the piles 2a and 2b, respectively. The pile connector 1 is made to be stronger than the piles 2a and 2b, and for example, waste plastic can be reused. Hereinafter, each component will be described in detail.

[0012] <2>Contact plate 11 The contact plate 11 is a disc-shaped plate with a larger diameter than the penetration holes 21a and 21b provided in the pile 2 and the upper shaft 12 and the lower shaft 13. When connecting the piles 2a and 2b, the upper surface and the lower surface of the contact plate 11 contact the upper pile 2a and the lower pile 2b, respectively. At the center of the upper surface of the contact plate 11, the upper shaft 12 is erected vertically. Similarly, at the center of the lower surface of the contact plate 11, the lower shaft 13 is erected vertically.

[0013] <3>Upper shaft 12 The upper shaft 12 is a shaft with a smaller diameter than the contact plate 11 and has a conical or truncated conical shape with a taper that narrows upward. On the outer periphery of the upper shaft 12, a spiral upper engaging ridge 121 is formed counterclockwise from the end on the contact plate 11 side upward. The upper engaging ridge 121 is formed in a spiral shape for about one to one and a half turns over a range of 1 / 3 to 1 / 2 of the length of the upper shaft 12 (Fig. 3).

[0014] <4>Lower shaft 13 The lower shaft 13 is a conical or truncated conical shaft erected on the lower surface of the contact plate 11 and has a smaller diameter than the contact plate 11, similar to the upper shaft 12. The lower shaft 13 has symmetry that is reversed along the axial direction with respect to the upper shaft 12 and has a taper that narrows downward. The spiral upper engaging teeth 121 of the upper shaft 12 are counterclockwise, while the spiral lower engaging teeth 131 of the lower shaft 13 are formed clockwise downward. Further, the lower engaging teeth 131 of the lower shaft 13 are formed in a spiral shape of about one to one and a half turns over a range of 1 / 3 to 1 / 2 of the length of the lower shaft 13.

[0015] <5>Connection of the pile connector 1 and the piles 2a, 2b The pile connector 1 penetrates into the penetration holes 21a, 21b provided in advance in the piles 2a, 2b arranged vertically. The penetration holes 21a, 21b are cylindrical and have substantially the same diameter as the diameter of the tip portions of the upper engaging teeth 121 of the upper shaft 12 and the lower engaging teeth 131 of the lower shaft 13 of the pile connector 1. Further, the depth of the penetration holes 21a, 21b is made deeper than the protruding length from the contact plate 11 of the upper shaft 12 and the lower shaft 13.

[0016] <6>Installation of piles <6.1>Installation of the lower pile 2b Next, the method of installing the piles will be described. First, the lower pile 2b is installed by pressing or rotary pressing to a predetermined depth, and the lower shaft 13 of the pile connector 1 is penetrated into the penetration hole 21b and fixed (Fig. 4). Since the diameter of the penetration hole 21b is substantially the same as the diameter of the tip portion of the lower engaging teeth 131 of the lower shaft 13, after the lower shaft 13 is housed in the penetration hole 21b up to the tip portion of the lower engaging teeth 131 (Fig. 4(a)), the pile connector 1 is pushed in while rotating clockwise, so that the lower shaft 13 penetrates into the penetration hole 21b (Fig. 4(b)). Although the lower shaft 13 has a taper, since the lower engaging teeth 131 are in a spiral shape of about one to one and a half turns, it can be easily penetrated into the penetration hole 21b with a small amount of rotation. Then, the lower shaft 13 having a taper and the lower engaging teeth 131 provided on its peripheral surface bite into the pile 2b, which becomes the pulling resistance of the pile connector 1. The lower shaft 13 is erected on the contact plate 11, and the lower shaft 13 is not penetrated beyond the position where the contact plate 11 contacts the upper surface of the pile 2b, and the penetration amount is constant.

[0017] <6.2>Installation of the upper pile 2a Then, the upper shaft 12 of the pile connector 1 is inserted into the penetration hole 21a of the wooden pile 2a, which is suspended from a pile driving machine or the like (Figure 2b). Since the diameter of the penetration hole 21a is approximately the same as the diameter of the tip of the upper engagement peak 121 of the upper shaft 12, the wooden pile 2a is lowered until the upper shaft 12 fits into the penetration hole 21a up to the tip of the upper engagement peak 121. Because the upper shaft 12 has a taper, the wooden pile 2a stops lowering at that position, and then the upper shaft 12 is driven into the penetration hole 21a by lowering the wooden pile 2a while rotating it clockwise, connecting the upper and lower wooden piles 2a and 2b via the wooden pile connector 1. Since the upper engagement peak 121 of the upper shaft 12 is spiral-shaped with about one to one and a half turns, it can easily penetrate the penetration hole 21a with a small amount of rotation. Then, the tapered upper shaft 12 and the upper engagement peak 121 on its circumferential surface bite into the wooden pile 2a, providing resistance to the pull-out of the wooden pile connector 1. Since the wooden pile connector 1 has a contact plate 11, when the wooden pile 2a is lowered while rotating, the wooden pile connector 1 does not rotate together with the wooden pile connector, and the lower shaft 13 does not penetrate further into the wooden pile 2b. By rotating the wooden pile 2a while inserting the upper shaft 12 in this manner, the upper shaft 12 and lower shaft 13 are evenly inserted into each wooden pile 2a and 2b, with the contact plate 11 as the center, and the wooden piles 2a and 2b are connected via the wooden pile connector 1. Subsequently, wooden piles 2a and 2b are driven into the ground while applying pressure to the upper wooden pile 2a.

[0018] <6.3> Effects of connection using wooden stake connector 1 The wooden pile connector 1 has pull-out resistance, allowing the upper and lower wooden piles 2a and 2b to be connected with both bending strength and pull-out resistance. This prevents, for example, the lifting of support pile 2a due to pressure generated in the ground when another support pile is driven adjacent to already driven support piles 2a and 2b in soft ground, and prevents the lifting of support piles due to buoyancy of water caused by a temporary and rapid rise in water level due to heavy rain during construction. By preventing lifting, additional work such as re-pressing or cutting the pile heads due to lifting can be reduced, improving construction efficiency. Furthermore, it promotes the use of wooden piles and contributes to reducing environmental impact. [Explanation of symbols]

[0019] 1. Timber-mounted connecting fixture; 11. Connecting plate; 12. Upper shaft; 121. Upper fitting; 13. Lower shaft; 131. Lower fitting. 2a, 2b Wood Penetration Holes, 21a, 21b

Claims

1. A horizontal contact plate, An upper shaft erected in the center of the upper surface of the aforementioned contact plate, It consists of a lower shaft erected in the center of the lower surface of the aforementioned contact plate, The upper shaft is conical or frustoconical in shape, having a taper that narrows upwards. The lower shaft is conical or frustoconical in shape, having a taper that narrows downwards. On the outer circumference of the upper shaft, spiral upper engagement peaks are formed in a counterclockwise direction, extending upward from the end on the contact plate side. On the outer circumference of the lower shaft, spiral lower engagement peaks are formed in a clockwise direction, extending downward from the end on the contact plate side. Wooden stake connector.

2. The upper engaging peak is formed in a spiral shape of one to one and a half turns over a range of 1 / 3 to 1 / 2 of the length of the upper shaft. The lower engagement peak is characterized by being formed in a spiral shape over a range of 1 / 3 to 1 / 2 of the length of the lower shaft, with a length of 1 to 1.5 turns. The wooden stake connector according to claim 1.

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