KR920008712B1 - Pile driving cap block cushion assembly - Google Patents

Abstract

In cushion assembly of pile cap used to drive a pile into the ground with a hammer, anvil pad (7) composed of synthetic resin with elastic modulus of 50,000 to 800,000 psi and with recovery coefficient of 0.2 to 0.9 is arranged on slanted groove (2) of the top of cap (1). Between the pile (3) and the cap (1) synthetic resin with the same range of material property as above mentioned but having different intrinsic vibration, elastic modulus and recovery coefficient is composed. Cushion (6) with air-vent (5) is placed at the center of the assembly. Anvil pad (7) and cushion (6) composed of a compound of themoplastic and thermosetting resins and a sort of rubber.

Description

PILE DRIVING CAP BLOCK CUSHON ASSEMBLY

1 is a file type operation diagram for explaining the present invention.

2 is an exploded perspective view partially cut away of the pile cap for explaining the present invention.

3 is a left sectional view of the assembly of the pile cap of the present invention.

* Explanation of symbols for the main parts of the drawings

1 cap 2 groove

3: file 4: annular cylindrical part

5: through-hole 6: cushioning material

7: anvil pad 8: hammer

The present invention relates to a cushioning material of a pile cap.

For example, in the construction of high-rise buildings, such as apartments and buildings, or in the construction of factory construction sites, pile hammer devices used to type steel pipe piles, concrete piles, or H-beams in the ground Noise and vibration generated when hammers type piles and oil smoke in diesel hammers cause pollution problems. Therefore, they cannot be used in densely populated areas such as cities.

Instead, there are hydraulic lifting and lifting of the ram or hammer, or pneumatic or mechanical lifting by the electric motor or solenoid.However, the impact generated when the hammer types the pile into the ground causes the pile head to be crushed. To reinforce the pile, the reinforcing bars that make up the skeleton are exposed. In order to prevent the impact of the pile head, even if a wooden board, a bale or plywood is placed on the pile head, the concrete head is broken and exposed to the steel bars or bales. It takes time and effort.

In addition, the sound insulation in the above-mentioned RAM can also be made of hard synthetic rubber plates such as urethane foam and butadiene rubber (see Japanese Utility Model Publication No. 56-51081).

In other words, high molecular materials containing urethane grooves and synthetic rubbers have a low natural frequency and elasticity above a certain temperature, and remarkably improve the point elastic properties such as stress relaxation. It is suitable as. In terms of the soundproofing effect, a combination of polymer materials having a high density difference can be obtained by stacking heterogeneous polymer materials having different densities than those of a single polymer material. It is typical and synergy based on sound absorption and cushioning properties can be obtained.

In addition, US Pat. Nos. 4,479,522 and 4,513,828 are known to use thermoplastic plastics having an elastic modulus of 50,000 to 800,000 p.s.i and a recovery coefficient of 0.4 to 0.9 to buffer the pile cap.

In other words, the buffer cap is provided with a cone having a cushion to cover the top of the concrete pile to cushion the impact on the anvil of the pile type hammer.

Therefore, in the helmet type buffer cap formed of the upper end of the pile and steel or rigid material, the impact of the hammer is transmitted to the upper end of the pile through the anvil cushion and the helmet, and the pile is buried in the ground. Is absorbed to protect the upper end of the pile. However, even if a part of the impact of the hammer is absorbed, if the remaining impact is continuously applied to the upper end of the pile, the upper end of the concrete pile is crushed by the impact and vibration. It is only slightly crushed when the hammer is applied directly.

In the present invention, in consideration of the above, the thermoplastic polymer-containing resin having a cushion to soften the impact of the hammer is also placed on the top of the pile cap, and the thermoplastic resin and the thermosetting resin having several air passages formed in the center between the cap and the top of the pile; It was confirmed by experiments and experience that the above problems can be solved by installing a buffer plate made of rubber.

As the thermoplastic resin having good mechanical impact property, excellent frictional wear property, low temperature property, plasticity, flexibility, and no change in size, for example, acetals, acrylics, and celluloses are used in the present invention. Cellulosics, Fluorocarbons, Polyamides, Polyolefins, Styrenes, Vinyls, Polyesters, Polycarbonates, Polyimides Polyimdes, Polyamide-imide Copolymers, Acetal Homopolymers, Acetal Copolymers, Fluoroplas-tics, Poly Polyphenyl oxides, copolyesters, polytherimides, polystyrenes, polyvinyls, polysulfones, and the like. Curable resins include aminos, casein, epoxys, phenolics, polyesters, silicones, urethanes, nylons ). Rubbers include natural rubber, synthetic rubber (Styren Butadiene Rubber (SBR)), butyl rubber (Buty), poly-sulfide, nitrile rubber (Nitaile), and chlorosulfonated polyethylene (Chloro sulfanated Polyethylene). , Urethane rubber (Urethane), ethylene propylene rubber (Ethylene Propylene), silicone rubber (Silicone) and the like. Therefore, the thermoplastic resin, the thermosetting resin, and the rubbers have high modulus of elasticity and good resilience, and can be arbitrarily selected for mixing by extrusion. Especially, polyethylene terephthalate, polybutylene terraphthalate, nylon 6, and nylon 66 More preferred.

In addition, antioxidants, heat stabilizers, reinforcing agents, coloring agents, and the like may be added. Such heat stabilizers may be more capable of raising the melting point of the molded product by 150 ° C to 200 ° C or higher. Addition can be used. In addition, thermoplastic resins, thermosetting resins and rubbers may be extruded by varying the mixing ratio arbitrarily according to pile conditions, working conditions, etc., and the thickness thereof is also the same.

When the present invention is described in detail according to the accompanying drawings as follows.

Figure 1 is a working view of the type of file for explaining the present invention, Figure 2 is a partially exploded perspective view for explaining the present invention, Figure 3 is a cross-sectional view of the assembly of the cushioning material of the pile cap according to the present invention. As shown in FIGS. 1 to 3, the upper surface of the cap 1 made of steel is provided with a recess 2 having an inclined inner circumferential surface, and the lower surface of the cap 1 along the periphery of the cap 1. A cylindrical annular cylindrical portion 4 is formed to be fitted.

In addition, a buffer (6) made of a synthetic resin having a plurality of through holes (5) in the center between the cap (1) and the upper end of the pile (3) to be vented with the central hole of the concrete pile (3). ) And the anvil pad 7 made of another type of synthetic resin is placed on the inclined groove 2 on the upper surface of the cap 1.

In the figure, reference numeral 8 is a hammer, and 9 is a handle. Therefore, when the cap (1) is put on the handle (9) on the pile (3) made of synthetic resin on the ground and the buffer material (6) through which a plurality of through holes (5) are placed in the center, the synthetic resin buffer material (6) A plurality of through holes (5) are in communication with the space portion formed in the center of the pile (1), and the anvil pad (7) acting as a support plate made of synthetic resin in the inclined groove portion (2) of the upper cap (1) The pile 3 can be typed into the ground by hitting it downwards through the hammer 8. At this time, the impact noise and vibration hitting the pile (3) with the hammer (8) is primarily absorbed by the impact noise on the anvil pad (7) made of synthetic resin and the impact force is made of the cap (1) and synthetic resin Since the shock absorber 6 is applied to the upper end of the pile 3, the pile 3 is absorbed by the intermediate synthetic resin buffer 6 while being typed into the ground, and the upper end of the pile 3 is hammered. The top of the concrete pile is not broken evenly under the force of).

In other words, due to the cushioning of shock noise in the anvil pad 7 of synthetic resin, secondary shock absorption in the buffer material 6 of synthetic resin, and noise absorption in the central groove of the through hole 5 and the pile 3. By interaction, the noise and vibration noise are maximized.

Therefore, when the synthetic resin anvil pad 7 and the synthetic resin buffer 6 are made of different polymer synthetic resins, the natural frequencies of the resins are different, so that interference of sound occurs and a soundproofing effect is caused to the annular cylindrical portion 4. The sound is cut off by the sound. In addition, the impact and vibration at the time of the type of the hammer 8 is synergistic in that the space formed in the center of the pile 3 and the through hole 5 communicate with each other to serve as a cushion.

For the experiment as described above, when there is no anvil pad (7) made of a synthetic resin material, when there is no buffer material (6) of a synthetic resin, and the anvil pad (7) and the buffer material (6) made of all synthetic resin materials are removed. In order to measure the noise at the time of the measurement, first, the anvil pad (7) of the synthetic resin material and the cap (1) from which the cushioning material (6) made of the synthetic material was removed are covered with the concrete pile (3) to measure the noise hit by the hammer (8). Based on one thing.

As a result, when there was no synthetic buffer material at all, it took time to remove the cylindrical part 4 of the cap 1 from the upper part of the pile 3 as well as the noise and the top of the pile 3 due to the impact. 3) When the anvil pad 7 and the cushioning material 6 made of the above-described synthetic resin material were put on the upper and lower sides of the cap 1, the impact was reduced by 18-25 dB compared to the absence of the cushioning material at all. When only the anvil pad 7 made of ash was removed, it was confirmed that 7-8 dB of noise was removed, and there was no phenomenon such as crushing due to the impact of the upper surface of the pile (3). Therefore, when hitting through the anvil pad 7 made of the synthetic resin material and the completed material 6 as described above on the upper and lower surfaces of the cap 1, it was confirmed that the insulating layer acts as a sound insulating layer by different natural frequencies. The cushion effect by (5) was also confirmed.

In addition, the anvil pad and the buffer material were better when the polymer synthetic resin having different natural frequencies, and when mixing different types of synthetic resin can be arbitrarily selected according to the working conditions or the shape of the pile at any ratio. Of course.

Claims (3)

In the cushioning material of the pile cap used to type the pile into the ground with a hammer, the elastic modulus is 50,000pso to 800,000psi and the recovery coefficient is 0.4 to 0.9 Anvil pad (7) made of phosphorous synthetic resin material is placed, and the anvil pad (7) in a synthetic resin having an elastic modulus of 50,000 psi to 800,000 psi and a recovery coefficient of 0.4 to 0.9 between the pile (3) and the cap (1). A buffer member of the pile cap, characterized in that it is made of a synthetic resin material having a natural frequency, elasticity coefficient and recovery coefficient different from the) and distributes the buffer member 6 formed with a plurality of through holes 5 in the center thereof. The pile cap cushioning material according to claim 1, wherein the anvil pad (7) and the buffer material (6) are made of a composition formed by arbitrarily selecting and molding a thermoplastic resin, a thermosetting resin and rubbers. The cushioning material of the pile cap according to claim 1, wherein a cylindrical cylindrical portion (4) is formed on the lower main surface of the cap (1).

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