JP3609479B2 - Attaching structure of bag body to pile body and fixing tool - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a fixture for attaching a bag body to a tip end portion of a pile in civil engineering or construction work, and an attachment structure thereof.
[0002]
[Prior art]
Conventionally, in civil engineering or construction work, for the purpose of increasing the bearing capacity of a pile, a cloth bag body is attached to the tip of the pile, and after the pile is buried in the ground, high-pressure concrete or the like is placed in the bag body. A method of press-fitting a curable material, inflating the bag body with the curable material, and press-fixing it to the ground is known, for example, described in Japanese Patent Publication No. 4-40491.
[0003]
[Problems to be solved by the invention]
In this method, it is necessary to firmly fix the pile to the ground via a bag body inflated with a hardened material. Therefore, the hardened material is pressed into the bag body at a high pressure, and the bag body can withstand the high pressure. It is necessary to be.
[0004]
And both ends of the bag body must be firmly fixed to the pile, and even when a high pressure is applied to the bag body, the fixed portion may be broken or the cured material inside may leak. Must not be.
[0005]
In conventional piles, both ends of a bag body having a diameter sufficiently larger than that of the pile body were squeezed and fixed to the pile body by a metal band or the like. However, when using a bag body having a large diameter, When the high pressure was applied to the bag, the bag body was expanded, and the metal band was easily broken, and the high-pressure cured material could not be pressed.
[0006]
FIG. 8 is a view showing a state in which the end portion of the bag body 2 is fastened and fixed to the pile body 1 by the metal band 3. When the pressure of the hardening material 4 press-fitted into the bag body 2 is low, the bag body 2 is appropriately clamped and fixed by the metal band 3 as shown by the solid line in FIG. When the body 2 is used and the pressure of the curable material 4 is increased, the bag body 2 expands due to the internal pressure, and the end of the bag body 2 covers the outside of the metal band 3 as indicated by the chain line. Acts to raise the edge of 3.
[0007]
Therefore, even if the metal band 3 itself has a strength capable of withstanding the pressure in the metal band 3, the metal band 3 can be easily broken because it is lifted from one edge. Further, the bag body 2 may be damaged by the edge of the metal band 3 that is rolled up.
[0008]
When using a bag with such a large diameter, the hardened material cannot be injected at high pressure, so it cannot be pressed firmly against the ground, and the fixing strength of the pile to the ground is increased. It was difficult.
[0009]
The present invention has been made in view of such circumstances, and an object of the present invention is to press-fit a high-pressure cured material into the bag body 2 without breaking the fixture, and to firmly fix the pile to the ground. It is what.
[0010]
[Means for solving the problems]
Thus, the fixture according to the present invention is formed by bending a steel rod into a circle, and both ends of the steel rod (7) are overlapped in the circular axial direction over the substantially half circle of the circle. The two rings are fixed parallel to each other at intervals, and flanges are attached to both ends of the steel rod across the outside of both rings, and the center of the steel rod spans the outside of both rings. Accordingly, the receiving means is provided with a receiving flange facing the flange, and provided with fastening means for fastening the flange and the receiving flange in a direction approaching each other.
[0011]
Further, the invention of the structure for attaching the bag body to the pile body is such that a small-diameter portion whose both ends are approximately equal to or slightly larger than the outer diameter of the pile body is formed at the tip portion of the pile body, and the pile body is formed at the center portion. A bag body having a large-diameter portion sufficiently larger than the outer diameter of the bag body is fitted, and the small-diameter portions at both ends of the bag body are fastened to the pile body by fastening with the above-described fixing tools.
[0012]
1 and 2 show a fixture 5 according to the present invention, and this fixture 5 includes a pair of rings 6 and 6.
[0013]
Each of the rings 6 and 6 is obtained by curving steel rods 7 and 7 in a circular shape, and both end portions thereof are overlapped in a circular axial direction over a substantially half circumference of the circle. Both rings 6 and 6 are arranged in parallel to each other and are connected via a stay 8.
[0014]
At both ends of the steel rods 7 and 7, flanges 9 and 9 are fixed across both rings 6 and 6, respectively, at positions facing the flanges 9 and 9 in the central portion of the steel rods 7 and 7, Receiving flanges 10 and 10 are fixed across the rings 6 and 6, respectively. The flanges 9 and 9 and the receiving flanges 10 and 10 are projected outside the rings 6 and 6.
[0015]
Bolt holes 11, 12 are formed in the flanges 9, 9 and the receiving flanges 10, 10, respectively. By tightening the bolt holes 11, 12 with bolts 13 and nuts 14, the flanges 9, 9 and the receiving flange 10 are formed. , 10 approach each other, and the diameters of the rings 6, 6 are reduced.
[0016]
Next, FIG. 3 shows an embodiment of the structure for attaching the bag body 2 to the pile body 1 in the present invention. In the present invention, the bag body 2 is a tubular woven fabric composed of warp yarns 15 and weft yarns 16 and has a diameter that changes in the length direction.
[0017]
That is, both end portions of the bag body 2 form a small-diameter portion 17 having a diameter approximately equal to or slightly larger than the outer diameter of the pile body 1, and the central portion of the bag body 2 is larger than the outer diameter of the pile body 1. A sufficiently large large diameter portion 18 is formed.
[0018]
And this bag body 2 is covered on the front-end | tip part of the pile body 1. FIG. And the fixing tool 5 is fitted to the outer side of the small diameter part 17 of the both ends of the bag body 2, and the diameter is reduced by tightening the bolt 13 and the nut 14, and the bag body 2 is the pile body 1 in the small diameter part 17. It is firmly tightened and fixed to the surface.
[0019]
[Action]
FIG. 4 shows a state in which the pile 21 to which the bag body 2 is attached according to the present invention is embedded in the ground, and FIG. 4 (a) shows a state in which the pile 19 is drilled in the ground 19. 4 (b) shows a state in which the pile 21 is inserted into the pile buried hole 20. The bag body 2 in the pile 21 is in a deflated state, and the pile 21 can be easily inserted into the small-diameter pile embedding hole 20.
[0020]
Next, a hardening material 4 such as concrete is press-fitted into the bag body 2 from the injection tube 22 inserted through the pile body 1, and the bag body 2 is expanded by the pressure of the hardening material 4 as shown in FIG. Then, the pile embedding hole 20 is expanded, and the pile 21 is firmly fixed to the ground 19 by pressing strongly against the ground 19.
[0021]
FIG. 5 shows an attachment portion between the bag body 2 and the pile body 1, and the small diameter portion 17 of the bag body 2 is fastened and fixed to the pile body 1 by the fixing tool 5. Here, when the curable material 4 is press-fitted into the bag body 2, the bag body 2 extends as described above due to the pressure of the curable material 4.
[0022]
At this time, in the present invention, the rings 6 and 6 of the fixture 5 are made of steel rods and have high strength, and both end portions of the bag body 2 are small diameter portions 17, and the small diameter portion 17 is tightened by the fixture 5. Therefore, the effect that the bag body 2 enlarges the diameter of the fixing tool 5 by its internal pressure is small, and only the force that mainly pushes the fixing tool 5 in the axial direction by the extension of the bag body 2 acts.
[0023]
And since the fixing tool 5 has clamped the bag body 2 with the two rings 6 and 6, and the contact area is small, the fixing tool 5 is a bag, suppressing the leakage of the hardening material 4 in the bag body 2 effectively. The surface of the body 2 can be slid.
[0024]
Therefore, when the bag body 2 is extended by the internal pressure, the fixing tool 5 slides and moves in the terminal direction as shown by a chain line in FIG. 5, thereby allowing the bag body 2 to extend, and the bag body 2 is fixed by the internal pressure. The force for expanding the diameter can be reduced.
[0025]
In this example, the bag body 2 is described as having the small-diameter portions 17 at both ends. However, even when the bag body 2 having a constant diameter sufficiently larger than the outer diameter of the pile body 1 is used, By using the fixing tool 5 of the present invention, the fixing part moves with the extension of the bag body 2 due to the internal pressure, so that the fixing tool 5 is not excessively expanded and broken, and the bag body 2 does not break. Will not be damaged.
[0026]
【Example】
FIG. 6 shows an embodiment of the present invention, wherein the small-diameter portion 17 of the bag body 2 is folded outward to be double, and a flexible string or rope is placed inside the folded edge 23. An annular string-like object 24 such as a wire is interposed. And it is clamped by the fixture 5 from the outside of the folded portion 25.
[0027]
In this embodiment, when the inner pressure is applied to the bag body 2 to expand and the fixing tool 5 is pushed in the axial direction, the fixing tool 5 swells annularly with the string-like object 24 interposed therebetween. The folding edge 23 is pressed, the terminal part of the bag body 2 slides and moves on the surface of the pile body 1, and the bag body 2 can expand | extend.
[0028]
Moreover, as shown in FIG. 6, by providing an annular rib 26 projecting from the terminal outer surface of the pile body 1, it is possible to prevent the bag body 2 from excessively extending and coming off from the terminal of the pile body 1. Can do.
[0029]
FIG. 7 shows another embodiment of the present invention. An annular rib 26 is projected on the outer surface of the pile body 1 so that the rib 26 is located between the rings 6 and 6. A fixture 5 is arranged.
[0030]
In this embodiment, the movement of the fixing device 5 is allowed within a range where the rib 26 is between the rings 6 and 6, the bag body 2 can be extended, and the inner ring 6 and the rib 26 Excessive movement of the fixture 5 is prevented.
[0031]
Moreover, when this structure is applied to the fixture 5 at the upper end of the bag body 2 in FIG. 4, the extension of the bag body 2 is allowed as described above, and excessive movement of the fixture 5 is prevented, When inconvenience arises in embedding the pile 21 in the pile embedding hole 20 and it becomes necessary to remove the pile 21, the bag body 2 moves in the distal direction relative to the pile body 1 by removing the pile 21. The fixing device 5 also moves to the left in FIG. 7, and the outer ring 6 is hooked on the rib 26 to prevent further movement, so that the bag body 2 is not excessively moved toward the distal end and becomes an obstacle, The pile 21 can be pulled out.
[0032]
【The invention's effect】
According to the present invention, the fixture 5 is composed of the two rings 6 and 6, which are connected in parallel, so that the strength is high, and the bag body 2 swells up or breaks from one side. There is nothing to do.
[0033]
Further, since the rings 6 and 6 respectively fasten the bag body 2 linearly, the curable material 4 is enclosed in the bag body 2 to prevent leakage, and since the contact area is small, the frictional resistance is small, and the fixing tool 5 between the bag body 2 and the bag body 2 or between the bag body 2 and the pile body 1, the fixing tool 5 moves as the bag body 2 extends due to the internal pressure, and the bag body 2 is fixed by the internal pressure. The force for enlarging the diameter of 5 can be reduced.
[0034]
Further, in the fixture 5 of the present invention, both ends of the rings 6 and 6 are overlapped, and the diameter is reduced by tightening the flanges 9 and 9 and the receiving flanges 10 and 10 by tightening means at the ends. Therefore, the bag body 2 can be uniformly tightened over the entire circumference.
[0035]
Further, if one flange 9 and the receiving flange 10 are tightened by the tightening means, the distance between the other flange 9 and the flange 10 is reduced due to the rigidity of the rings 6 and 6, and it is easily achieved by the tightening means such as the short bolt 13. Can be tightened.
[0036]
Further, according to the method of the present invention, since the small-diameter portion 17 that substantially coincides with the outer diameter of the pile body 1 is formed at both end portions of the bag body 2, wrinkles or the like may occur even when tightened by the fixture 5. Further, since the expansion due to the internal pressure is small in the small diameter portion 17, a force for expanding the fixture 5 does not occur.
[0037]
Therefore, according to the present invention, even if the high-pressure curable material 4 is press-fitted into the bag body 2, the fixture 5 does not break, and when the bag body 2 is expanded by the pressure of the curable material 4, the fixture 5 Can move with it, so that both ends of the bag body 2 can be fixed uniformly.
[0038]
Further, according to the fifth aspect, the bag body 2 does not come close to the tip of the pile 21 even when inconvenience occurs in the pile 21 and the pile 21 needs to be pulled out from the pile embedding hole 20. Can be pulled out.
[Brief description of the drawings]
1 is a perspective view of a fixture 5 according to the present invention. FIG. 2 is a cross-sectional view of the fixture 5 according to the present invention. FIG. 3 is a side view showing a state in which a bag body 2 is attached to a pile body 1 according to the present invention. 4 is a process diagram showing a state in which a pile 21 is embedded in the ground 19. FIG. 5 is a central longitudinal sectional view of a main part in a state where the bag body 2 is attached to the pile body 1 according to the present invention. FIG. 7 is a central longitudinal sectional view of the main part showing an embodiment in a state where the body 2 is attached to the pile body 1. FIG. 7 is a view of the main part showing another embodiment in a state where the bag body 2 is attached to the pile body 1 according to the present invention. Center vertical cross section [Fig. 8] Main vertical cross section of the main part showing the conventional structure for attaching the bag 2 to the pile 1 [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pile body 2 Bag body 4 Hardening material 5 Fixing tool 6 Ring 7 Steel rod 9 Flange 10 Receiving flange 13 Bolt (tightening means)
14 Nut (tightening means)
17 Small-diameter portion 18 Large-diameter portion 21 Pile 23 Folding edge 24 String-like object 25 Folding portion 26 Rib

Claims (5)

A steel rod (7) is bent into a circular shape, and two rings (2 ) (both ends of the steel rod (7) are overlapped in the axial direction of the circle over the substantially half circumference of the circle. 6, 6) are fixed parallel to each other at intervals, and flanges (9, 9) are attached to both ends of the steel rod (7) across the outer sides of both rings (6, 6). A receiving flange (10, 10) facing the flange (9, 9) is attached to the center of (7) across the outside of both rings (6, 6), and the flange (9, 9) Fastening means (13, 14) for tightening the receiving flange (10, 10) in a direction approaching each other and fixing the bag body to the pile body A small-diameter portion (17) that is approximately equal to or slightly larger than the outer diameter of the pile body (1) is formed at both ends at the tip of the pile body (1), and the pile body (1) The bag (2) having a large-diameter portion (18) sufficiently larger than the outer diameter is fitted, and the small-diameter portion (17) of the bag (2) is fitted with the fixture (5) according to claim 1. Attachment structure of the bag body to the pile body, characterized by being fastened and fixed to the pile body (1) Both end portions of the bag (2) are folded outward, an annular string (24) is interposed inside the folded edge (23), and the fixture (5) from the outside of the folded portion (25). The structure for attaching a bag body to a pile body according to claim 2, wherein the bag body is tightened with The attachment structure of the bag body to the pile body according to claim 2 or 3, characterized in that an annular rib (26) is provided on the outer periphery of the end of the pile body (1). An annular rib (26) is projected on the outer periphery of the pile body (1), and the fixture (5) is arranged so that the rib (26) is located between the two rings (6, 6). The structure for attaching a bag body to a pile body according to claim 2 or 3,

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