KR20050008599A - The bolting joint shoe of a PHC(Pretentioned spun High strength Concrete) pile - Google Patents

Abstract

PURPOSE: A bolt-fastening type joint shoe of PHC(Pretensioned spun High strength Concrete piles) is provided to improve work efficiency by easily and simply combining shoe bodies and an impact-absorbing pad by a connection bolt body and to minimize production of a crack of piles or the joint shoe by absorbing impact in pile driving. CONSTITUTION: A bolt-fastening type joint shoe of a PHC comprises shoe bodies(10), a connection bolt body(20), and an impact-absorbing pad(23). In the shoe bodies, stopper plates(12) closing to one side of a ring band(11) having caliber corresponding to the outer diameter of the PHC are integrally formed in the same shape. The shoe body has a nut-shaped combining shaft(14) of a nut type vertically protruded through the center of the stopper plate. A female screw part(15) is formed to the bore of the nut-shaped combining shaft. In the connection bolt body, a male screw part(21) to be screwed to the female screw part in the nut-shaped combining shafts is formed to the outer periphery. A stop pitch(22) is formed in the middle part of the connection bolt body. The impact-absorbing pad is a pad of a disk shape having a diameter identical to the stopper plate. A circular hole(24) corresponding to the stop pitch of the connection bolt body is bored in the center of the impact-absorbing pad.

Description

Bolting joint shoe of a PHC (Pretentioned spun High strength Concrete) pile}

The present invention relates to a bolted joint shoe of a PHC pile, and more particularly, to a buffer that is installed by force insertion at each end of a joint of a PHC pile to be connected, and absorbs and alleviates an impact between the shoe body of the joint shoe. A pad is provided, and the shoe body and the shock absorbing pad are easily and conveniently coupled together by a connecting bolt body, so the construction is very simple and quick, and minimizes the occurrence of cracks in the pile or joint shoe through shock absorption during driving. It is intended to be able to be installed even in rainy weather or eczema with bolt fastening type.

Generally, soft ground is a case in which the ground itself cannot withstand the load from the upper structure or the predicted settlement exceeds the allowable value. Soft ground, loose sandy soil, organic soil, etc. belong to such soft clay or organic soil. If roads, bridges, buildings, etc. are placed on the soil, soils are excessively settled and the bearing capacity is insufficient, resulting in safety problems. In recent years, waste has become an important environmental problem, As a basis for roads and buildings, plans are also being made. In such grounds, excessive settlement and lack of support are expected, and soft ground treatment measures are required.

Among the countermeasures for stability and settlement problems of structures based on such soft grounds, the method of reaching fill layer, which is commonly used, is the method of using steel, PHC, PC, RC, etc. As the construction of ready-made concrete piles by a method such as blow or landfill, the PHC piles are applied when the construction of the PHC piles with a hammering method using a diesel hammer, a steam hammer or a hydraulic hammer.

The PHC pile (Pretentioned spun High strength Concrete Piles) is a high-strength pile with a pretensioning method of concrete compressive strength of 78.5 N / mm 2 (800 Kgf / ㎠) made by applying centrifugal force. It can withstand greater axial loads than PC piles, and evenly introduces prestress required to concrete sections with compressive strength of 800Kgf / ㎠ or more, resulting in excellent impact strength and Because it completely absorbs the tensile stress caused by the reflected wave, it also easily penetrates the middle hard layer, which is not cracked and difficult to hit with conventional PC piles, so it is possible to penetrate deeper and harder layers, as well as flexural tensile stress of concrete. As it is large, it is the most suitable pile for seismic design that receives both axial and horizontal forces. The way to the effect.

In the PHC pile according to the prior art configured as described above, when the depth of the pile is varied or connected up and down according to the size of the building to be constructed or the state of the geological structure, the joint cap or the joint at the upper and lower ends of the pile Since the welding strength between the upper and lower PHC piles depends on the skill of the site operator, it is easy to cause an imbalance in the strength of the weld, and if the weld cross section is too thin, the welding strength drops. Due to the cracks and breakage of the weld at the time of hitting due to the type of pile was not able to achieve its original purpose.

In addition, since the upper and lower parts must be manufactured in different forms, a lot of costs are required for the production and at the same time, even when a PHC file is produced by using the upper and lower parts, it is necessary to always check the upper and lower parts and their use positions before using them. Brought about.

And when the hammer hits the upper end of the PHC pile in order to manufacture the PHC pile by the conventional joint cap and to install it on the soft ground by impact method, the impact force by the hammer is concentrated on the upper end by the joint cap There was a problem that the concrete cracking the upper portion of the PHC file by the blow.

In addition, in the case of the conventional field welding method, the welding properties of the steel itself constituting the joint shoe due to the welding heat as well as the welding heat, as well as to the pile concrete due to the conduction heat to reduce the strength of the pile connection In addition, there is a problem of impairing the structural stability and, due to the nature of the field work, the welding work itself is difficult in rainy weather, the cracks in the weld occurs due to the rapid cooling of the weld in winter, which causes a problem that the work rate decreases.

The present invention is provided with a buffer pad which is installed by forced insertion at each end of the joint of the PHC pile to be connected, to absorb the shock between the shoe body of the joint shoe to improve the problems of the prior art as described above. Since the shoe body and the shock absorbing pad are easily and conveniently coupled together by a connecting bolt body, the construction industry is very simple and quick to increase the work efficiency, and minimize the occurrence of cracks in the pile or joint shoe through shock absorption during driving. For that purpose.

In addition, according to the present invention, since the bolt is fastened instead of the welding method, the construction can be carried out even in rainy weather or eczema, and it is possible to increase the strength of the pile joint by resolving changes in the physical properties of the joint shoe or damage to the pile, and to increase structural stability and workability. In addition to increasing the cost, the construction equipment and the like is simple, the construction cost is low, the economical purpose is another increase.

1 is an exploded perspective view showing a joint shoe of the present invention

Figure 2 is an installation sectional view of mounting the joint shoe of the present invention to the PHC pile

3 is a cross-sectional view taken along the line AA ′ of FIG. 2;

[Description of Symbols for Main Parts of Drawing]

1: Lower PHC Pile 1 ': Upper PHC Pile 2: Reinforcing Steel Wire

10: shoe body 11: ring band 12: stopper plate

13 ring projection 14 nut-type coupling shaft 15 female thread

16 insertion hole 17 support piece 18 cutting groove

20: connecting bolt body 21: male thread portion 22: stop pitch

23: buffer pad 24: circular hole

The present invention relates to a bolted joint shoe of a PHC pile, and more particularly, to a buffer that is installed by force insertion at each end of a joint of a PHC pile to be connected, and absorbs and alleviates an impact between the shoe body of the joint shoe. A pad is provided, and the shoe body and the shock absorbing pad are easily and conveniently coupled together by a connecting bolt body, so the construction is very simple and quick, and minimizes the occurrence of cracks in the pile or joint shoe through shock absorption during driving. It is intended to be able to be installed even in rainy weather or eczema with bolt fastening type.

1 is a full exploded perspective view showing a joint shoe of the present invention, FIG. 2 is an installation cross-sectional view of the joint shoe of the present invention mounted on a PHC pile, and FIG. 3 is A of FIG. A cross-sectional view along the line 'A', and the detailed configuration will be described below.

The joint shoe of the present invention is mounted on the shoe main body 10 which is overlaid on the outer periphery of each end of the upper and lower PHC piles 1 and 1 ', and the upper and lower PHC piles 1 and 1'. It is composed of a buffer pad 23 provided between the shoe main body 10 and the connecting bolt body 20 for coupling the two shoe main body 10 and the shock absorbing pad 23 to each other, so that the welding work is difficult and hassle-free. The bolt fastening method enables simple and easy connection of the PHC file and minimizes the occurrence of cracks in the file or joint shoe itself during impact through shock absorption.

First, in the case of the shoe main body 10, a stopper plate 12 which is closed to one side of the ring band 11 having an inner diameter that matches the outer diameter of the PHC pile 1 is integrally formed, the ring band 11 A plurality of protruding ring protrusions 13 are formed on the inner circumference of the plug plate 12, and the stopper plate 12 forms a nut-shaped coupling shaft 14 protruding vertically through the center thereof, and the stopper plate 12. On the spaced apart from the nut-shaped coupling shaft 14 is a snowman-shaped insertion fixing hole 16 in which a large and small circular hole is integrally arranged at a predetermined interval in a ring shape, the nut-shaped coupling shaft 14 A plurality of support pieces 17 are provided on the outer side, and the female threaded part 15 is processed in the inner diameter part thereof, and an arc-shaped cutting groove 18 is formed on the stopper plate 12 between the support pieces 17. ) Is formed.

In addition, in the connecting bolt body 20, the nut-shaped coupling shaft 14 in a cylindrical shape having a height approximately twice that of the diameter fit within the central nut-shaped coupling shaft 14 of the shoe body 10. A male thread portion 21 screwed to the inner thread portion 15 of the inner circumference is formed on the outer circumference, and a stop pitch 22 is formed by cutting in a ring shape at an intermediate point where the male thread portion 21 is formed. .

In addition, the shock absorbing pad 23 is a disc-shaped rubber pad having the same diameter as the stopper plate 12 of the shoe main body 10, and the center portion has an outer diameter of the stop pitch 22 of the connecting bolt body 20. Circular holes 24 are drilled to a size consistent with.

The joint shoe of the present invention is joined by having the shoe body 10 coupled to the end of the PHC pile (1) (1 ') when jointing the PHC pile, but first, the shoe at the end of the lower PHC pile (1) Covering the main body 10, at this time, the ring projection 13 formed inside the ring band 11 of the shoe main body 10 is pressed while being forced to the outer periphery of the PHC pile (1) (1 ') It is firmly coupled, and then the female thread portion 15 of the inner circumference of the central nut-shaped coupling shaft 14 of the shoe body 10 and the stop male thread 22 of the stop pitch 22 of the outer circumference of the connecting bolt body 20 21) by screwing, the shock absorbing pad 23 is inserted into the stop pitch 22, and then another shoe body 10 in the same manner as above to the upper side of the connecting bolt body 20 and The upper PHC pile 1 'is integrally integrated, and the reinforcing steel wire 2 is provided in the insertion fixing hole 16 formed on the stopper plate 12 of the shoe body 10 in the above. It is equipped with a vertical ipseol up and down in the interior of the PHC piles (1) (1 ') is reinforced.

As described above, the joint shoe according to the present invention is installed by force insertion at each end of the joint portion of the PHC pile to be connected, and the shock absorbing pad 23 which absorbs and cushions the shock between the shoe main body 10 of the joint shoe. ) Is provided, the shoe body 10 and the shock absorbing pad 23 is easily and simply integrated integrally by the connecting bolt body 20, the construction is very simple and fast, due to the shock absorption during the pile pile Cracks do not occur in the joint shoes, and the bolted type allows installation in rainy or wet places.

The present invention is provided with a force pad is installed at each end in the joint portion of the PHC pile to be connected, the shock absorbing pad to absorb and cushion the shock between the shoe body of the joint shoe, the shoe body and the buffer pad is connected to the bolt By combining the body easily and simply by the sieve, the construction industry is very simple and quick to improve the work efficiency, and has the effect of minimizing the crack generation of piles or joint shoes through shock absorption during driving.

In addition, according to the present invention, since the bolt is fastened instead of the welding method, the construction can be carried out even in rainy or wet places, and the strength of the pile joint is increased by eliminating the change of the physical properties of the joint shoe and the damage of the pile, and the structural stability and workability. In addition to increasing the cost, the construction equipment is simple and the construction cost is low, there is an effect that the economic efficiency is increased.

Claims (3)

A plug plate 12 which is closed to one side of the ring band 11 having an inner diameter that matches the outer diameter of the PHC pile 1 in the same shape up and down is integrally formed, and penetrates to the center of the plug plate 12. To form a nut-shaped coupling shaft 14 which protrudes vertically, the inner diameter of which is the shoe main body 10 on which the female screw portion 15 is processed, A male screw portion 21 screwed into the female threaded portion 15 is formed on the outer circumference of the upper and lower shoe body 10 in the central nut-like coupling shaft 14, and cut in the form of a ring at an intermediate point thereof to stop. A connecting bolt body 20 having a pitch 22 formed thereon; A disk-shaped pad having the same diameter as that of the stopper plate 12 of the shoe body 10, the center portion of which is cushioned with a circular hole 24 corresponding to the stop pitch 22 of the connecting bolt body 20. Bolted joint shoe of PHC pile, characterized in that consisting of a pad (23). According to claim 1, wherein the shoe body 10 is formed with a plurality of ring projections 13 protruding on the inner circumference of the ring band 11, spaced apart from the nut-shaped coupling shaft 14 on the stopper plate 12 In the state, the snow-shaped insertion fixing holes 16 in which the large and small circular holes are integrated are arranged at regular intervals in a ring shape, and the plurality of support pieces 17 are provided on the outer side of the nut-type coupling shaft 14. Bolted joint shoe of the PHC pile, characterized in that the cutting groove 18 of the arc shape is formed on the stopper plate (12) between the support piece (17). According to claim 1 or 2, The connecting bolt body 20 is a cylindrical shape having a height approximately twice the diameter and fit within the central nut-shaped coupling shaft 14 of the shoe body 10, the nut type A male screw portion 21 screwed into the female threaded portion 15 of the inner circumferential edge of the coupling shaft 14 is formed on the outer circumferential edge, and a stop pitch 22 is formed by cutting in a ring shape at an intermediate point where the male threaded portion 21 is formed. ) Is formed so that the shock absorbing pad 23 is fitted to the bolted joint shoe of the PHC pile.