JP3101656B2 - Formwork for manufacturing spiral concrete piles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold for manufacturing a spiral concrete pile.

[0002]

2. Description of the Related Art Spiral concrete piles (hereinafter referred to as spiral piles)
As shown in FIG. 5, a shaft 2, a spiral 3 provided on at least a part of the outer periphery of the shaft 2, and a shaft 4 attached near the top of the shaft 2 as necessary, as shown in FIG.
The pile is composed of, for example, JP-A-2-115
As described in Japanese Patent Publication No. 409, it is used as a foundation pile of a house or the like. The shaft 4 is used to engage the top of the pile 1 with an attachment of the heavy equipment when the pile 1 is screwed into the soil by the heavy equipment.

Conventionally, in order to manufacture such a pile 1, a mold shown in FIGS. 6 and 7 has been used. The formwork 5 is composed of split dies 6 and 7 each having an inner shape in the shape of a half of the pile 1 in the longitudinal direction, and a cap 8 having an inner shape in the shape of the outer end of the pile 1. Vertical ribs 9 and 10 for reinforcing and bolting are attached to the outside of the contact portions of 6 and 7, respectively. On the other hand, split mold 6
Semi-circular ribs 11 and 12 are attached to the distal end portions of the caps 8 and 7, respectively, and a circular rib 13 is also attached to the cap 8. Also, semi-circular notches (not shown) are formed at the abutting portions 14 near the tops of the split dies 6 and 7 at symmetrical positions, and a circular hole is formed when the split dies 6 and 7 abut. At the same time, the outside of the hole is formed as a notched portion 15 where no reinforcing rib is formed, so that the shaft 4 can pass therethrough.

Then, the split halves 6 and 7 are matched and fastened with bolts 16, and the cap 8 is attached to the tip end with bolts 17.
And assemble the formwork. Next, the tip was placed vertically downward, and ready-mixed concrete was poured from the top.

[0005]

However, when a pile is manufactured using such a conventional mold, there are the following problems.

[0006] Since the split dies 6 and 7 are clamped by a large number of bolts, they must be removed when the concrete is removed after solidification of the concrete, and the work is troublesome. Therefore, one side of each of the reinforcing ribs 9 and 10 of the split dies 6 and 7 may be connected to each other with a hinge 18 (see FIG. 8), and the split dies 6 and 7 may be freely opened and closed with the hinge 18 as a center. it was thought. However, simply joining them with ordinary hinges will result in a split-shaped inner convex portion (corresponding to the pile axis 2).
However, the split mold cannot be completely opened because it is caught by the spiral 3 of the pile 1 solidified in the formwork. Therefore, it is necessary to configure the split mold so as to be displaced in the vertical direction along the spiral of the pile. However, there is a disadvantage that the hinge structure becomes very complicated.

[0007] The work procedure for the pile production is as follows. First, the split mold is laid horizontally on the ground surface, the mold is clamped, and then the vertical is poured, and fresh concrete is poured in from the top. Demolding was done, but the task of making a heavy formwork vertical or horizontal was quite cumbersome and dangerous.

When the form is made vertical, the spiral portion of the form forms an overhang, so that cracks and pinholes are easily formed in the concrete in that part, and the form is arranged vertically. As a result, aggregate (gravel) of ready-mixed concrete tends to collect underneath, and the strength of the upper part of the pile was sometimes insufficient.

[0009]

SUMMARY OF THE INVENTION A pile forming form according to the present invention has been made to solve the above-mentioned drawbacks of the prior art, and has a vertical shape having an inner shape that resembles the outer shape of a spiral pile. Equipped with a split mold divided into three,
The other two split molds are arranged on both sides of one split mold so as to be openable and closable, respectively, and a concrete injection port is provided on a side wall of the split mold. As a preferred embodiment, the above-mentioned formwork has a tip of a pile. It is characterized by including one or both of a front end cap and a rear end cap having an inner shape that resembles the outer shape of the part and the rear end. And, as a further preferred embodiment, a cutout is provided at exactly the symmetrical position of the other two split dies, so that the injection mold is constituted when the split die is closed, and the one split die is formed. A mold mounting table is attached below the mold, and a mold fastener such as a hook joint for clamping the other two molds is provided on the other two split molds.

In a further preferred embodiment, notches are formed at symmetrical positions near the rear ends of the other two split dies, respectively. When the split dies are closed, the notches are used to form a pile shaft. A hole through which the shaft of the pile is formed is formed near the rear end of the one split mold.

[0011]

The pile forming form according to the present invention is constituted by a split mold divided into three, so that when the two split molds are opened right and left after solidification of the concrete, the inner convex portion (pile of the pile) of the split mold is opened. (Corresponding to the shaft part) does not catch on the spiral of the pile inside, and the split mold can be completely opened. In addition, since the concrete injection port is provided on the side wall of the split mold, the pile manufacturing operation can be performed while the formwork is kept horizontal. As a result, cracks and pinholes did not occur, aggregates of ready-mixed concrete were not unevenly distributed, and the strength of each part of the pile could be increased and made uniform.

By attaching the form mounting table below the center split mold, it is possible to always work while maintaining the form at a stable position. Furthermore, by providing mold fasteners such as hook joints for clamping the molds on the left and right split molds, the split molds can be opened and closed very easily and quickly, and at the same time, bolts are used for tightening the split molds. The use of special power machinery for tightening and removing bolts causes considerable vibration, which reduces the chances of unnecessary vibration and damage to newly solidified concrete. .

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 is a plan view of the mold of the present embodiment, FIG. 2 is a sectional view taken along the line AA of FIG. 1, FIG. 3 is a sectional view illustrating a state where the mold of FIG. 2 is opened, and FIG. It is a figure for explaining before (a) and after a mold clamping (b) of a hook joint of an example.

The formwork 20 of the present embodiment includes split dies 21, 22, and 23 made of thin steel plates having an inner shape that resembles the outer shape of the pile 1 and divided into three equal parts in the vertical direction. The front end cap 24 has an inner shape that resembles the outer shape of the part, and the rear end cap 25 closes the rear end of the split mold.

Outside the contact portions of the split dies 21 to 23, longitudinal ribs 26 (a, b) for reinforcement and tightening are provided, respectively.
27 (a, b) and 28 (a, b) are attached. On the other hand, fan-shaped ribs 29 (a, b), 30 (a, b) having an inner angle of 120 ° are respectively provided on the outer periphery of the leading end and the rear end of each split mold.
31 (a, b) are attached, and fan-shaped ribs 29 (c, d, e), 30 (c, d,
e), 31 (c, d, e) are attached (however, only the fan-shaped rib 29e in the middle is shown in FIG. 2 for the fan-shaped rib of the split shape 21). The fan-shaped ribs 30e and 31e are not formed in a hopper described later.

The split mold 21 is provided with a mounting table 35 thereunder.
It is supported by a support bar 36 erected between the mounting table 35 and each fan-shaped rib 29 (c, d, e). Vertical rib 27b
A bearing member 37 is attached to each of the support members 28 and 28b.
And is rotatably supported via. Therefore, the split 21
The split shapes 22 and 23 located on both sides of the support member 38 are rotatable about a rotation shaft 39,
By the action of 0, the position shown in FIG. 3 is maximized so as not to open any more.

Notches 46 (a, b) and 47 are respectively formed at symmetrical positions on the side surfaces of the split shapes 22 and 23 so as to form the concrete inlets 45 (a, b) when they come into contact with each other.
(A, b). The inlet 45a is provided in the shaft portion of the formwork 20, and frame members 49 (a, b) which form the hopper 48 when abutting around the notches 46a, 47b are attached. The inlet 45b is provided in each spiral part of the formwork 20. The vertical ribs 27a and 28a
Is not formed in the portion of the inlet 45.

The lower part of the split 21 near the rear end is the shaft 4
A hole 50 through which the hole 5 passes is formed.
A semicircular notch is formed at a position opposing 0,
A hole 51 is formed when the split halves 22 and 23 come into contact with each other. Note that the vertical ribs 27a and 28a
It is not formed in the portion of No. 1. Also, hole 5 of split 21
In the vicinity of 0, a stop piece 52 for preventing the shaft 4 from dropping is attached.

Each fan-shaped rib 30 (c, d, e), 31
The hook joint 60 is installed at (c, d, e). As shown in detail in FIG. 4, the hook joint 60 is provided upright on the engaging member 61 provided on the fan-shaped rib 30 (c, d, e), and provided on the fan-shaped rib 31 (c, d, e). A support member 62, a shaft member 63 rotatably mounted on the support member 62, a shaft 64 rotatably mounted on the shaft member 63 and having a threaded end, and a nut into which a threaded portion of the shaft 64 is screwed. A hook 66 having a horseshoe shape as a whole and a lever 70 having a shaft 69 rotatably attached to the tip of the hook 66 via a shaft 67 and fitted into an engagement groove 68 of the engagement member 61; Be composed. The hook joint 60 can fit the shaft 69 into the engagement groove 68 and press down the lever 70 to tighten the split dies 62 and 63.

Next, the method of using the mold 20 will be described. First, the split dies 22 and 23 are opened to the state shown in FIG. 3, and a release agent is sprayed on the entire inside. Then pile 1
Is placed on the split mold 21, the split molds 22 and 23 are closed, the mold is clamped by the hook joint 60, and the shaft 4 of the pile 1 is inserted through the hole 51. The reinforcing bar is provided with two ring-shaped wires for hanging the pile, and the ring-shaped wires are set so as to be exposed to the outside of the form from the concrete inlet. Finally, the front end cap 24 and the rear end cap 25 are attached by bolting, and ready-mixed concrete is injected from the concrete injection ports 45a and 45b.

After the concrete has solidified, first, the front end cap 24 and the rear end cap 25 are removed, the hook joint 60 is released, and the split dies 22 and 23 are opened as shown in FIG. Next, the ring-shaped wire is hooked by a suitable fishing tool, lowered, and released.

The use of the front end cap and the rear end cap in the above embodiment is for facilitating the removal of the mold. However, the shape of the front end or the rear end of the split mold itself is changed to the outer shape of the front end or the rear end of the pile. , And one or both of the front end cap and the rear end cap may not be used. Further, in the above embodiment, the specific fastener is used as the fastener, but any other type of fastener may be used, and any type of fastener other than the hook joint may be used as long as the required fastening force is obtained. Not even. Further, the attachment of the front end cap and the rear end cap can also be performed using a mold fastener other than the bolt.

[0023]

As described above, according to the present invention, when the two split dies are opened to the right and left after the concrete is solidified, the inner convex portion (corresponding to the shaft portion of the pile) of the split dies is formed by the spiral of the middle pile. The split mold can be completely opened without getting caught on the dies. In addition, since the concrete injection port is provided on the side wall of the split mold, the pile manufacturing operation can be performed while the formwork is kept horizontal. As a result, cracks and pinholes did not occur, aggregates of ready-mixed concrete were not unevenly distributed, and the strength of each part of the pile could be increased and made uniform.

Further, by attaching the form mounting table below the center split mold, it is possible to always work while maintaining the form at a stable position. Furthermore, when providing mold fasteners such as hook joints for fastening the left and right split molds, the split molds can be opened and closed very easily and quickly, and at the same time, bolts are used for tightening the split molds. Unnecessary vibrations are less likely to occur, and damage to freshly solidified concrete is reduced.

[Brief description of the drawings]

FIG. 1 is a plan view of a mold for manufacturing a spiral concrete pile according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a cross-sectional view for explaining a state where the mold of FIG. 2 is opened.

FIG. 4 is a diagram for explaining a state before (a) and after (b) mold clamping of the hook joint of the present embodiment.

FIG. 5 is a front view of a spiral concrete pile.

FIG. 6 is a front view of a conventional mold for manufacturing a spiral concrete pile.

FIG. 7 is a plan view of the same.

FIG. 8 is a plan view of a mold for manufacturing a spiral concrete pile when hinges are connected to a conventional split mold.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spiral concrete pile 2 axis part 3 Spiral 4 shaft 20 Spiral concrete pile manufacturing form 21, 22, 23 split type 24 Tip cap 25 Rear end cap 26, 27, 28 Split type vertical rib 29, 30, 31 split type Fan-shaped rib 35 mounting table 37 bearing member 39 rotating shaft 40 stopper 45 concrete injection port 48 hopper 50, 51 hole 52 stop piece 60 hook joint

Continued on the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) E02D 5/30 E02D 5/56 B28B 7/10 B28B 21/82-21/84

Claims (6)

(57) [Claims] 1. A split mold which is divided into three in the longitudinal direction and has an inner shape that resembles the outer shape of a spiral pile, and the other two split molds are arranged on both sides of one split mold so as to be openable and closable. A spiral concrete pile manufacturing form characterized by having a concrete injection port provided on a side wall of a split mold. 2. The spiral according to claim 1, further comprising one or both of a tip cap and a rear end cap each having an inner shape that resembles an outer shape of a tip portion and a rear end portion of the pile. Formwork for concrete pile production. 3. A cutout is provided in each of the other two split dies at exactly symmetrical positions, and the cutout constitutes the injection port when the split dies are closed. 3. The mold for manufacturing a spiral concrete pile according to 2. 4. The mold for manufacturing a spiral concrete pile according to claim 1, wherein a mold mounting table is attached below said one mold. 5. The mold for manufacturing a spiral concrete pile according to claim 1, wherein a mold fastener for clamping the other two molds is provided on the other two molds. 6. A notch is formed at a position just symmetric in the vicinity of the rear end of the other two split dies, and the notch constitutes a hole for passing a shaft of a spiral concrete pile when the split die is closed. The spiral concrete pile manufacturing form according to any one of claims 1 to 5, wherein a hole through which the shaft of the spiral concrete pile passes is formed near the rear end of the one split mold. .