KR20060125982A - Sheet pile having an inner space and using method of the same - Google Patents

Abstract

A sheet pile having an inside space is provided to get driven in the ground easily and quickly by letting water or compressed air flow along the boundary between a sheet pile and the ground. A sheet pile having an inside space contains a vibrating hammer holder(14) formed on the top of the upper part of the sheet pile, hanging projections(15) formed on both ends to engage with adjacent sheet piles from the top to the bottom, a steel end plate(17) blocking the top from the area right below the vibrating hammer holder to the bottom except a water or compressed air injection port(16), and an inside space formed on the bottom to get water or compressed air injected. Hereon the sheet pile is driven in the ground by attaching a vibrating hammer to a vibrating hammer holder of a sheet pile, injecting water or compressed air through a water or a compressed air injection port using a compressor and setting up a vibration using a vibrating hammer.

Description

Sheet pile having an inner space and how to use it {sheet pile having an inner space and using method of the same}

1A is a cross-sectional view of a conventional U-shaped sheet pile, and FIG. 1B is a cross-sectional view of the connected state.

2 and 3 is an embodiment of the sheet pile of the present invention, Figure 2 is a cross-sectional view, Figure 3a and Figure 3b is a perspective view of the top and bottom, respectively.

4 to 7 are views for explaining a method of using the sheet pile of the present invention, Figure 4 is a cross-sectional view showing the flow of water or compressed air when the sheet pile is embedded, Figure 5 after the sheet pile is embedded, Figure 6 is a cross-sectional view showing the process of filling and compacting gravel at the bottom, Figure 6 is a cross-sectional view showing the process of pumping the groundwater permeated into the interior space of the sheet pile, Figure 7 is a sheet pile occupied when the construction is completed to extract the sheet pile It is the process of extracting the filled space with sand.

8A through 8D are cross-sectional views of various forms of sheet piles to which the concept of the present invention is applied.

* Description of the symbols for the main parts of the drawings *

11: conventional sheet pile 12: interior space

13: Steel plate attached to sheet pile 14: Vibratory hammer mounting part

15: Jaw 16: Water or compressed air inlet

17: copper plate 21: vibratory hammer

31: compressor 32: water tank

33, 37: gate valve 34: check valve

35: pressure gauge 36: hose

41: gravel 42: weight

43: rope 44: sand

45: double hose 46: jet pump head

47: Compressor 48: Funnel

a, b: flow of water or compressed air (a is inside, b is outside)

The present invention relates to a sheet pile and a method of using the same, and more particularly, to a sheet pile having an internal space that prevents the soil of the construction neighbors from collapsing and water does not leak out when the trench construction work. .

When digging work for new construction of subways or high-rise buildings, the most common method is to insert an H-beam into the ground and sandwich a wooden panel between the beams. According to the report, it is possible to prevent the soil from falling down, but it is not possible to prevent the water from leaking out. There is a problem that results.

Thus, the U-shaped sheet pile shown in Fig. 1a has been developed and used, and can be connected and used in the same form as in Fig. 1b to simultaneously prevent soil and water.

However, these U-shaped sheet piles can be driven only 20m at most, depending on the performance and ground conditions of the vibratory hammer (the machine that piles the top of the pile and vibrates the pile up and down). Because the contact area with the ground is large, the friction force is large, and the impact of the vibration hammer transmitted by the elasticity of the steel is not properly transmitted to the lower part.

Therefore, when the sheet pile needs to be deeply drilled, there is an auger combination method in which the sheet pile is drilled in the seat where the sheet pile is to be put in advance and the sheet pile is inserted. The disadvantage is that later friction (power to pull the sheet pile down as the soil settles).

Another method is a water jet method that inserts a nozzle at the tip of the sheet pile and inserts the sheet pile while breaking the ground of the tip with high pressure water of about 150kg / ㎠. It costs about four times as compared to using only a vibration hammer, so it is uneconomical in a place where the ground is not very hard, and it has a disadvantage of disturbing the surrounding ground and messing around the construction site due to the high water consumption of 300ℓ / min. .

It is an object of the present invention to provide a sheet pile and a method of using the same, which can be driven into the ground more quickly at a desired depth at low cost.

At the top, there is a vibratory hammer mounting portion for mounting the vibratory hammer, and the left and right ends have a locking jaw formed to engage with the seat piles adjacent to each other from the top to the bottom, and from the bottom to the bottom of the vibratory hammer mounting portion, water or compression The seat pile is closed except for the air inlet, and the bottom is formed with a space for injecting open water or compressed air.

EMBODIMENT OF THE INVENTION Hereinafter, the structure of this invention is described in detail using drawing.

2 is a cross-sectional view of one embodiment of the sheet pile of the present invention. Compared with the conventional sheet pile 11 shown in FIG. 1, there is an inner space 12 into which water or compressed air is injected. This may be produced by welding the iron plate 13 to a conventional sheet pile as shown in Figure 2, or may be manufactured in one piece as shown in FIG.

3A and 3B are perspective views of the upper and lower portions of the sheet pile of the present invention, respectively. The upper end of the upper part has a vibration hammer mounting portion 14, the left and right ends are formed with a locking jaw (15) so as to engage with the seat pile adjacent to each other from the upper end to the lower end, the upper end from just below the lower end of the vibration hammer mounting portion The part except silver water or the compressed air inlet 16 is blocked by the molten iron plate 17, and the lower part (not shown) is open, and an internal space 12 into which water or compressed air is injected is formed. .

Although the sheet file varies depending on the intended use, one length is approximately 10 to 30 m, and in addition to the sheet file having the cross-sectional view of FIG. 2, various other types of sheet files having the cross sections of FIGS. 8A to 8D may be produced.

Hereinafter, a method of using the sheet file of the present invention will be described with reference to FIGS. 4 to 7. 4 is a cross-sectional view showing the flow of water or compressed air when the sheet pile is embedded, Figure 5 is a cross-sectional view showing the process of filling and compacting gravel at the bottom after the sheet pile is embedded, Figure 6 is an internal space of the sheet pile 7 is a cross-sectional view showing a process of pumping groundwater soaked in, and FIG. 7 is a process of filling the space occupied by the sheet pile with sand when the construction is completed and the sheet pile is extracted.

First, the method of embedding the sheet pile into the ground, the vibration hammer 21 is mounted on the vibration hammer mounting portion 14 of the upper end of the sheet pile, and the water or compressed through the water or compressed air inlet 16 with the compressor 31 Vibration hammer is applied while injecting air.

In this way, as shown in Figure 4, the water or compressed air injected into the sheet pile discharges the soil at the tip of the sheet pile (marking the flow of water or compressed air with arrows. Reference numerals a and b). ) Not only does the ground of the front end of the sheet pile become compact, but the friction between the sheet pile and the ground is reduced, so that the sheet pile is easily nailed.

As a result of performing water injection, it was confirmed that the working speed is more than twice as fast as the conventional sheet pile.

For example, a device for injecting water may be configured as shown in FIG. 4. The compressor 31 is connected to the water tank 32, and the two lines are pulled out so that the line on the seat pile side blocks the water. To the water or compressed air inlet 16 via a check valve 34 and a pressure gauge 35 to prevent water from flowing in the reverse direction, and the line on the water tank side passes through the gate valve 37. Connect the water tank and adjust the injection pressure.

The method of the present invention is similar to the waterjet method in that water is used. In the waterjet method, the ground is crushed purely by the force of water, whereas in the present invention, the water prevents the ground of the tip portion from being compacted and the sheet pile and the ground It only serves to reduce the friction between the ground is different in that the ground is broken by the impact of the vibration hammer. Therefore, the water consumption is only about one third of the water jet method, and the compressed air instead of water depending on the site conditions is different from the water jet method.

Once the pile pile is in the ground, a support system must be provided to prevent the sheet pile from falling over. In particular, in the case of roads, the cover pile is normally covered with a perforated plate so that the vehicle can pass. At this time, the seat pile should not sink more deeply. So, if the ground is weak, the sheet pile must be deeply driven until hard ground comes out, which may not be economical.

In this case, the seat pile of the present invention, as shown in Figure 5, by inserting the gravel 41 in the inner space of the sheet pile can be reinforced by holding the weight 42 to the rope 43 to strengthen the bearing capacity of the soft ground have.

When there is a lot of water in the construction site, such as a landfill, there is fluidity, so its own bearing capacity is small, and its weight per unit volume is high, so the earth pressure applied to the sheet pile is high and it is difficult to construct it.

In such a case, it is desirable to lower the groundwater level, and after the sheet pile is driven into the ground, the sand 44 is filled to a suitable height at the bottom of the inner space of the sheet pile, and the seeping water can be discharged to lower the groundwater level. have.

As shown in FIG. 6, the jet pump head 46 is attached to the end of the double hose 45 to a suitable depth, and when compressed air is injected into the compressor 47, water and air rise between the outer hose and the inner hose. You can also take the water out.

After the construction is completed, the sheet pile is dismantled, but the conventional sheet pile is plate-shaped, so it is difficult to properly fill the space occupied by the sheet pile with earth and sand, and the space remains jointly, and many problems occur later.

However, in the case of using the sheet pile of the present invention using the funnel 48 while the sand is put up and down while putting the sheet pile up and down, the sand piled up from the bottom can be properly filled the space where the sheet pile was . This process is shown in FIG.

When the sheet pile of the present invention is driven into the ground, frictional force is reduced because water or air flows on the interface between the sheet pile and the ground, and the ground of the sheet pile tip is not compacted so that it can be easily driven. Therefore, in the same geological conditions, the impact amount of the vibration hammer can be reduced, thereby reducing the vibration and noise of the construction site.

In addition, when the construction is completed and the sheet pile is removed, vacuum is generated in the space where the conventional sheet pile existed, and it is difficult to extract it, whereas the sheet pile of the present invention has an empty space in which water or air existed. It can be easily filled with sand in the space occupied by water or compressed air and the space where the sheet pile existed, thereby preventing the surrounding land from sinking.

In addition, where the geology is weak, it is possible to improve the geology of the ground by crushing gravel through the internal space if necessary, and if desired, the groundwater level around the seat pile can be lowered by spreading water through the internal space. As the cross section of the sheet pile is in the form of a pipe, the bearing capacity is also increased.

Claims (5)

At the top, there is a vibratory hammer mounting portion for mounting the vibratory hammer, and the left and right ends have a locking jaw formed to engage with the seat piles adjacent to each other from the top to the bottom, and from the bottom to the bottom of the vibratory hammer mounting portion, water or compression The seat pile is closed except for the air inlet, and the bottom is formed with a space for injecting open water or compressed air. Vibration hammer is mounted on the upper part of the sheet pile, the vibration hammer is injected into the ground by injecting water or compressed air through the water or compressed air inlet with a pump or a compressor and driving the pile pile into the ground. How to strengthen the support of soft ground by putting gravel in the inner space of the seat pile and hanging the weight on the rope. After inserting the sheet pile into the ground, fill the sand at a suitable height in the lower part of the inner space of the sheet pile and pour out the seeping water to lower the groundwater level. How to fill up the space where the sheet pile was by pulling up and down while putting sand into the inside of the sheet pile using a funnel.

Images