JPH069064Y2 - Foundation of branch line - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a structure of a branch line foundation used for branch lines such as utility poles.

[Prior Art] Conventional branch line foundations (branch line anchors) include, for example, those previously filed by the present applicant and described in JP-B-53-40801.

This one comprises one substrate fixed to the lower end of the supporting rod, and two resistance plates formed in a palm shape by bending the front end portion outward and connecting the base end portions. Both shoulders are provided with downwardly inclined guide slopes, and each resistance plate is provided with vertical strips that engage with the guide slopes. Then, a resistance plate is fitted onto the support rod so as to be movable in the axial direction, the vertical strip is arranged at the bottom of the excavated hole in a state of being engaged with the guide slope, and the resistance plate is struck through the striking pipe. The resistance plate is expanded by.

[Problems to be Solved by the Invention] In the conventional branch line anchor described above, as shown in FIG. 12, the resistance plate 1 is expanded by expanding the resistance plate 1 and then putting soil in the hole to set the resistance plate 1 therein. Assuming that the unit soil pressure p acts uniformly over the entire expansion length A of the substrate 2, the length B of the substrate 2
And the overhang length C of the resistance plate 1 protruding from the left and right ends of the board 2 are within a certain ratio, the force by which the board 2 pulls up the resistance plate 1 based on the branch line tension T and the soil. Since the force that suppresses the pulling up of the resistance plate 1 based on the pressure p is balanced, the expanded resistance plate 1 does not slide up and the initial tension resistance can be secured.

Here, T = p × A × D D: width of the resistance plate 1.

However, the excavation hole for burying the branch line anchor is
There is a problem that it is difficult to increase the width of the substrate to 45 cm or more because the diameter of the 45 cm digging column car is widely used. Therefore, the thirteenth means for increasing the tensile strength is
As shown in the figure, if only the length of the resistance plate 1 is lengthened and the above-mentioned overhang length is C ₁ (C ₁ > C), the resistance plate 1
The balance between the pulling force and the deterrent force is lost, and the resistance plate 1 expanded to a position where the pulling force and the deterrent force are balanced, as shown in FIG. . Therefore, even if the length of the resistance plate 1 is increased, the area on which the soil pressure p acts does not change much (C ₂ ≈C, A ₂ ≈A), so that the desired tensile strength cannot be obtained. There was a point.

The present invention has been made in view of the conventional inadequacies, and the length of the substrate is increased by rotating the resistor plate when the resistance plate is expanded without increasing the initial length of the substrate. The purpose of this is to secure the balance between the pulling force of the resistance plate and its restraining force and increase the tension resistance.

As another example of the branch line anchor, for example, Japanese Patent Publication Sho 58
No. 27369 and Japanese Patent Publication No. 58-52054. These things are
In each case, the center line portion of the resistance plate is bulged to form a rib, and a plurality of side V-shaped notches are provided in the longitudinal direction of the rib, whereby the notch portion is sequentially bent and resisted. It has a structure that expands the plate.

Therefore, these branch line anchors have a technical concept different from that of the branch line foundation according to the present invention in which only the rigidity of the base end portion of the resistance plate is weakened, and the notch portion weakened in rigidity is used for the entire resistance plate. However, since there is a portion that easily bends even in the portion that protrudes to the outside, there is a problem that it is not possible to project it for a long time and spread it over a wide range.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention is arranged at the bottom of the hole (55) which is connected to the lower end of the supporting rod (3) and is flat and has a bottom surface. Two base plates (4, 4) provided with guide slopes (7) on the both shoulders, and the base plate on the support bar (3) so as to be movable in the axial direction of the support bar (3). While fitting, the inner surfaces of the base plates are joined to face each other to form a palm shape, and a long hole (20) is provided near the base end to weaken the rigidity and allow bending, and the front end is Two resistance plates (18, 18) provided with a vertical strip (19) which is curved outward and extends in the longitudinal direction of the central portion of the plate surface and engages with the guide slope (7); , The substrate (4
4) Two guide plates (11, 11) pivotally attached to both side ends of the guide plate and rotated by the pressing force of the resistance plates (18, 18) to expand the effective width of the substrate at the bottom of the drilling hole.
A bottom plate (5) fixed to the lower ends of the substrates (4, 4) so as to form a surface substantially perpendicular to the axial direction of the support rod (3), the bottom plate (5) and the substrate ( Lower portions are provided at both side ends of (4, 4) so as to project below the bottom plate (5), and slits (14, 14) for restricting the rolling and downward rolling of the induction plate (11, 11) are provided. Frame plate (10, 1
0) and are provided.

[Operation] Therefore, in the present invention, when the resistance plate externally fitted to the support rod is pressed, the resistance plate is expanded while being guided by the guide slope of the substrate and the guide slope of the guide plate while rotating the guide plate. Since the resistance plate that has entered the peripheral wall of the hole is supported by the substrate and the guide plate, the balance between the pulling force of the resistance plate due to the branch line tension and the deterrent force due to the earth pressure can be maintained, and the tensile strength can be increased. .

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings.

1 to 5 show an embodiment of the present invention. FIG. 1 is a front view, FIG. 2 is a side view, FIG. 3 is a front view of a substrate, and FIG. 4 is the same side view. FIG. 5 is a plan view of the same.

First, the structure will be described. In the figure, 3 is a support rod formed by a round bar, the upper end of which is an upper screw portion 3a to which a tool for expanding work is connected, and the lower end of which is two screws. Board 4,
Lower screw portions 3b for connecting the four are provided respectively.

As shown in the enlarged view of FIGS. 3 to 5, the two substrates 4 and 4 are
Has a flat bottom surface and is erected parallel to each other on the upper surface of the bottom plate 5 with a predetermined gap therebetween, and a notch 6 into which the lower end of the supporting rod 3 is inserted in the upper part of the center, Further, on both shoulders, downwardly inclined guide slopes 7, 7 are provided, respectively. Brackets 9, 9 having nuts 8 screwed onto the lower threaded portion 3b fixed to the lower ends are fixed to the outsides of the notches 6 of the two substrates 4 and 4 by fixing means such as welding.
Further, frame plates 10, 10 whose lower parts are projected below the bottom plate 5 are fixed to both ends of the substrate 4 and the bottom plate 5 by fixing means such as welding.

11 is a guide plate interposed in the gap between the substrates 4 and 4,
Axis 1 with the tip protruding outward from the side of the substrate 4
It is pivoted by 2 so that it can be turned up and down. The guide plate 11 restricts the upward rotation by the pin 13 that is bridged between the substrates 4 and 4, and the frame 10
The downward rotation is restricted by the slits 14 provided on the guide plate 11, so that each guide plate 11 can be vertically rotated about 90 degrees from a substantially vertical state to a substantially horizontal state. The guide plate 11 is provided with a guide slope 15 continuing from the guide slope 7 in a state of being turned substantially horizontally.

Reference numeral 16 is a temporary fixing plate that holds the guide plate 11 in a substantially vertical state, and is made of a material that is easily bent, and has one end fixed to one substrate 4 and the other end facing the other substrate 4. By bending it, the guide plates 11 are laterally supported and maintained in a substantially vertical state.

Reference numeral 18 denotes a pair of two resistance plates. Each resistance plate 18 is formed in a warp shape with its tip end facing outward, and has a longitudinally extending longitudinal direction at the center of its inner surface. Article 19
The guide slope 7 and the guide slope 15 are engaged with the groove 19. The base ends of both resistance plates 18 are joined together by, for example, spot welding, rivets or the like to form a palm-like shape, and a long hole 20 extending in the lateral direction is formed below the base ends in the vicinity thereof. It is provided at a location, so that the rigidity of a portion having the elongated hole 20 is made smaller than the rigidity of other portions,
Both resistance plates 18 are bent from this portion so as to expand outwardly. Reference numeral 21 is a reinforcing member that is attached to a part of the outer surface of the vertical strip 19 and prevents the warp of the resistance plate 18 from returning.

Further, reference numeral 22 denotes a pipe portion which serves as a guide for the supporting rod 3, and two guide pieces formed by press-forming a semicircular recess are butted against each other from both sides and joined to the base end portions of both resistance plates 18 by spot welding or the like. It is connected by means. The pipe portion 22 may be provided by welding a separate short pipe or the like.

Next, regarding the embedding method of this embodiment, Japanese Patent Publication No. 62-36
This will be described based on Japanese Patent Publication No. 087.

FIGS. 6 (a) to 6 (d) are views showing an example of the embedding procedure of this embodiment. In this embodiment, the resistance plate is used by using the press-fitting cylinder device 30 as shown in FIGS. 7 to 9. 18 is expanded.

The press-fitting cylinder device 30 is configured as follows. Reference numeral 31 is an equalizer having an end surface shape attached to the lower surface of the horizontal grip rod 32 and having a downward U-shape. Two hydraulic cylinders 33, 3 are provided on both inner sides of the equalizer 31.
The upper end of 4 is pin-connected. And the equalizer 31
A boss 35 to which the upper screw portion 3a of the support rod 3 is screwed and fixed is provided in the central portion of the lower portion of the hydraulic cylinders 33 and 34 below the pin connection point.

Also, the rods 33a, 34 of the hydraulic cylinders 33, 34 are
The lower end of a is pin-coupled to a bracket 36 whose end surface shape is an upward U-shape, and an insertion hole 36a for a push pipe 50 described later is provided in the center of the bracket 36. Further, pressure oil ports 37 and 38 are provided at the upper ends of the hydraulic cylinders 33 and 34, respectively.
7 and 38 are connected by a hydraulic hose 39, and a joint 40 is attached to one port 37.
Then, pressure oil ports 41 and 42 are provided at the lower end portions of the hydraulic cylinders 33 and 34, respectively, and both ports 41 and 42 are communicated with each other by a hydraulic hose 43. A hydraulic guide pipe 44 is connected along the side surface, and a joint 45 is provided at the upper end of the hydraulic guide pipe 44 in proximity to the joint.

As shown in FIGS. 7 and 10, the length of the push pipe 50 is slightly shorter than the length of the support rod 3 from the position of the upper edge of the resistance plate 18 mounted on the support rod 3 to the upper end thereof. Rod 3
The lower end seat 50a of the push pipe 50 fitted to the resistance plate 1 is
The length is set such that the upper threaded portion 3a of the supporting rod 3 is exposed in the state of being in contact with the upper end of the support rod 8. The press-fitting cylinder mounting 30 is fitted on the upper portion of the push pipe 50, and the boss 35 pin-connected to the equalizer 31 is attached to the upper screw portion 3a of the supporting rod 3.
The flange 51 is provided at a position where a slight gap is formed between the bracket 51 and the lower surface of the bracket 36 in a state where the flange 51 is screwed.

When embedding the branch line foundation using the press-fitting cylinder mounting 30 and the push pipe 50, first, the substrate 4 is attached to the lower end.
Pass the pipe portion 22 of the resistance plate 18 through the support rod 3 connected to
The ridges 19 formed on the resistance plate 18 are engaged with the guide slopes 7 of the substrate 4 to combine the resistance plate 18 so as to be orthogonal to the substrate 4, and the branch line foundation is assembled.

After that, as shown in FIG. 6 (a), a hole 55 having a predetermined diameter and depth is drilled at a desired location with an auger 24 or the like of a building column vehicle, and the push pipe 50 is covered in the hole 55. Insert and install the branch line foundation in the fitted state.

Next, as shown in FIG. 3B, an operator fits the press-fitting cylinder device 30 onto the upper portion of the push pipe 50, and the press-fitting cylinder attachment 30 is rotated while the boss 35 provided on the device 30 is rotated. Is screwed onto the upper screw portion 3a of the supporting rod 3. Then, the joints 40, 45 of the press-fit cylinder device 30.
After connecting the hydraulic hoses 39 and 43 of the hydraulic device (not shown) to the, hydraulic pressure is applied in the direction of the arrow as shown in FIG.

Then, the central portion of the bracket 36 that connects the lower ends of the two hydraulic cylinders 33 and 34 and the flange 51 of the push pipe 50 with which the bracket abuts act as a force point, and the push expansion force that acts on the push pipe 50 in the descending direction. The resistance plate 18 is pressed from above by. As a result, the two resistance plates 18 gradually expand from the portion of the long hole 20 provided in the vicinity of the base end while expanding and expanding along the guide slope 7 of the substrate 4 and the locking force of the temporary fixing plate 16. The guide plate 11 is turned downward against the force.

As a result, the left and right guide plates 11 are turned from the substantially vertical state of the left half shown in FIG. 3 to the substantially horizontal state shown by the solid line through the state of the two-dot chain line shown in the right half, and the resistance plate 18 is guided by the guide slope. It spreads from 7 along the guide slope 15 of the guide plate 11 and penetrates into the soil which is the outer peripheral wall of the hole 55 from the warp-shaped tip.

At this time, since the bottom plate 5 is provided on the lower surface of the substrate 4 having a flat bottom surface, the bottom plate 5 can prevent the substrate 4 from being embedded in the bottom of the hole 55, and the original hole 55 can be formed.
The resistance plate 18 can be expanded at the bottom of the. Further, since the frame plate 10 is provided on the side surface of the substrate 4, the frame plate 10 can receive a large downward load generated in the guide plate 11 when the resistance plate 18 is pressed.

Next, when the expansion and embedding of the resistance plate 18 is completed, the connection between the hydraulic hoses 39 and 43 and the joints 40 and 45 is released, and the press-fitting cylinder device 30 is rotated in the opposite direction to the above to support the support rod 3. The screw connection between the upper screw portion 3a and the boss 35 is released, and the press-fitting cylinder device 30 is removed by the operator. Then, after removing the push pipe 50, as shown in FIG.
The operation of burying the main branch line foundation is completed by screwing the branch line connecting ring 56 to the upper screw portion 3a and filling the hole 55 with soil.

Thus, the branch line foundation is constructed as in the above embodiment, and
As shown in the figure, the total length on the substrate 4 side is B ₂ (B ₂ = B + 2
B ₁ ), the total extension length is A ₃ (A ₃ ≈A ₁ ), and the overhang length is C ₃ (C ₃ ≈C), and the force by which the substrate 4 tries to pull up the resistance plate 18 based on the branch line tension. , Earth pressure p
Based on the above, by balancing the force for suppressing the pulling up of the resistance plate 18, it is possible to prevent the expanded resistance plate 1 from sliding up and to secure the initially set tension resistance.
Here, B ₁ is the protruding length of the guide plate 11 protruding from the side portion of the substrate 4.

When removing the press-fit cylinder device 30 in the above embodiment, the hydraulic pressure is applied in the direction opposite to the state shown in FIG. 6 (c) to return the two hydraulic cylinders 33, 34 to the original state. You can also do it.

Further, in the above-mentioned embodiment, an example of expanding the resistance plate by using the press-fitting cylinder device has been described, but the present invention is not limited to this, and for example, a pipe is externally fitted to the support rod and the pipe is fitted to the hammer. Needless to say, the resistance plate may be expanded by hitting with.

[Effects of the Invention] As described above, according to the present invention, the supporting rod (3) is provided.
The nut (8), which is connected to the lower end of the rod, is placed at the bottom of the excavated hole (55) and has a flat bottom surface, and the nut (8) screwed to the lower screw portion (3b) of the support rod (3) is fixed to the lower end. The two bases (4, 4) having the brackets (9, 9) fixed thereto and provided with the guide slopes (7) descending outward on both shoulders, and the base end of the support rod (3). The support rod (3) is externally fitted so as to be movable in the axial direction, and the inner surface sides of the base end portions are face-to-face connected to each other to form a palm shape, and the rigidity is weakened near the base end portion and bent. A long hole (20) is provided to enable the tip end portion to be curved outward, and to extend in the longitudinal direction of the central portion of the plate surface and to extend outward in a vertical shape 19 which engages with the guide slope (7). The two resistance plates (18, 18) provided and the substrate (4, 4)
4) is rotatably attached to both side ends by pivots (12, 12) and is rotated by the pressing force of the resistance plates (18, 18) to expand the effective width of the substrate at the bottom of the drilling hole. By providing the induction plate (11, 11), the large resistance plate (18, 18) can be reliably expanded laterally at a predetermined depth, and the expanded resistance plate (18, 18) 1
8) does not have a bent portion in the central portion, and the guide plate (11, 1)
Since the support of 1) is obtained, a large capacity of tension resistance can be stably obtained without breaking the mechanical balance. Further, a bottom plate (5) fixed to the lower ends of the substrates (4, 4) so as to form a surface substantially perpendicular to the axial direction of the support rod (3), the bottom plate (5) and the substrate ( Lower portions are provided at both side ends of (4, 4) so as to project below the bottom plate (5), and slits (14, 14) for restricting the rolling and downward rolling of the induction plate (11, 11) are provided. Frame plate (10, 1
0) and, the frame plate (10, 10) bites into the bottom of the hole 55 by inserting and installing until the bottom plate (5) abuts on the bottom of the hole 55 excavated to a predetermined diameter and depth. The stable support rod (3) can be erected substantially vertically, and compared to the conventional branch line foundation material that is driven without excavating the hole 55, the burial position and direction can be accurately set and burried. When the resistance plates (18, 18) are expanded, it is possible to prevent the holes (55) from slipping into the holes 55 or the displacement of the substrates (4, 4) in the resistance plate expansion direction against the load at the time of press fitting. The effect that the work after the installation of the branch line foundation can be performed accurately and surely and the tension of the branch line after burying the branch line foundation can be well stabilized can be obtained.

[Brief description of drawings]

1 to 5 show an embodiment of the present invention. FIG. 1 is a front view, FIG. 2 is a side view, FIG. 3 is a front view of a substrate, and FIG. 4 is the same side view. Fig. 5 is the same plan view, Fig. 6 (a)
~ (D) is an explanatory view showing an example of a burial line burying process according to the present invention, Fig. 7 is an enlarged explanatory view of Fig. 6 (b), and Fig. 8 is a burial line burial work according to the present invention 9 is a front view of the press-fitting cylinder device used in FIG. 9, FIG. 9 is a side view of the same, FIG. 10 is a front view of the same push pipe, FIG. 11 is an explanatory view showing an expanded state of the resistance plate, and FIG. Explanatory drawing showing the expanded state of the resistance plate of the branch line anchor, FIG. 13 is an explanatory view showing the expanded state of the resistance plate when the resistance plate of FIG. 12 is enlarged,
The figure is an explanatory view showing the expanded state of the resistance plate when a large branch line tension acts on the branch line anchor shown in FIG. 3: Support rod 4: Substrate 5: Bottom plate, 7: Guide slope 10: Frame plate, 11: Guide plate 15: Guide slope, 16: Temporary stop plate 18: Resistor plate, 19: Vertical strip 20: Long hole, 30 : Press-fit cylinder device 50: Push pipe

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Yasuhiro Kajiura 1-15-20 Omori Nishi, Ota-ku, Tokyo WAKO SANGYO CO., LTD. Omori Factory (56) References JP-B-58-27369 (JP, B2)

Claims (1)

[Scope of utility model registration request] 1. Arranged at the bottom of an excavated hole (55) connected to the lower end of a supporting rod (3) and flattening the bottom surface,
A bracket (9, 9) having a nut (8) screwed to the lower screw portion (3b) of the support rod (3) is fixed to the lower end, and the guide slopes (7) which fall outward are attached to both shoulders. Provided 2
The base plates of the sheets (4, 4) are fitted onto the supporting rods (3) so that their base end portions are movable in the axial direction of the supporting rods (3), and the inner surface sides of the base end parts are opposed to each other. It has a long hole (20) which is formed into a palm-like shape by connecting it to the base end, weakens the rigidity and can be bent, and bends the tip end outward, and extends in the longitudinal direction of the central part of the plate surface. A vertical strip (1) which extends and engages with the guide slope (7) and which projects outwardly.
9) provided with two resistance plates (18, 18), and the resistance plates (18, 18) rotatably attached to both end portions of the substrate (4, 4) by pivots (12, 12). )
Two guide plates (11, 11) that are rotated by the pressing force of No. 1 to expand the effective width of the substrate at the bottom of the drilling hole, and the lower end of the substrate (4, 4) in the axial direction of the support rod (3). A bottom plate (5) fixed so as to form a surface substantially perpendicular to the bottom plate (5)
And lower portions are provided at both ends of the bottom plate (5) and the substrates (4, 4) so as to project below the bottom plate (5), and the induction plate (11, 11) is turned and turned downward. And a frame plate (10, 10) provided with limiting slits (14, 14).