KR20090082881A - Pedestal Construction - Google Patents

Abstract

A pedestal structure for casing installation is provided to place concrete easily by reducing the conveying length of concrete, to prevent eccentricity of a casing by keeping concrete not to be placed eccentrically in a casing and to maintain the perpendicularity of a perforation, and to prevent the backflow of excavated soil and water toward an injection hole. A pedestal structure(30), installed around a casing(10), comprises a deck(30a) arranged on the outer circumference of the casing, and a reinforcing pile(34) connected to the deck to support the deck, wherein a hollow is formed in the center of the deck to insert the casing and a connecting device(40a) is installed to the deck to restrict the casing and to fix to the deck.

Description

Base structure for casing installation {Pedestal Construction}

The present invention is to install a casing in order to establish a pier foundation in the water in the construction of the pier, the casing device with a casing cap, work equipment, etc. to carry out the pier construction work to prevent eccentricity generated during casing driving A perforation device installed on a casing and a perforation device mounted on the pedestal to carry out excavation work, the present invention relates to a perforation device having a check valve on a rod to prevent backflow of excavated soil and water.

Typically, casing foundations are used to build structures in deep rivers and seas. The well foundation, first, uses a crane on an underwater barge to tow up and down the casing in the form of a hollow cylinder or a square cylinder and opens the casing on an underground rock, such as a weathered rock layer, in a position to install the foundation structure. Install by installing. After the casing is settled, the inside of the casing is drilled using an auger drill, a hammer bit or a hammer grap, and the concrete is poured into the casing to complete the foundation.

Conventionally, as shown in FIG. 1, in order to seat the casing 10 on the weathered rock layer 1 at the position where the underwater foundation is to be installed, a part of the casing was simply inserted by using a vibration compressor and rocked up and down. .

However, when a vibration compressor is installed on one side of the casing to vibrate, eccentricity occurs in the casing, and the center of the casing and the structure installed on the casing are displaced, thus making it difficult to secure stability of the structure. For example, as mentioned earlier, the casing can only secure structural stability by entering the hard rock bed, but the earth pressure and sand in the soil layer must pass through the earth and sand layers in order to enter the rock. While the casing tends to be crooked due to the gravel and sand of the layer, a simple vibration takes a lot of time to pass through the soil layer and the sandstone layer.

In addition, since the equipment for concrete pouring or drilling work is not fixed to the barge, the barge is also not vulnerable to the impact caused by digging because the position is not fixed in the river or the sea, so that the pouring work or drilling work cannot be performed properly. There is a problem that construction stability cannot be secured.

On the other hand, after the casing is placed on the weathered rock layer 1, the casing is settled to the underground rock while dredging the soil or rock inside the casing. When the casing is settled down, another apparatus, such as a punching device with a bit, is usually used. As described above, when a separate equipment such as a drilling device is loaded on the barge, it is difficult to maintain the verticality of the drilling and it is difficult to install the structure in the correct position. In order to prevent this, as in the conventional reverse circulation drill (RCD) method, it is possible to construct a large temporary structure in advance, and install the equipment on the constructed temporary structure, but at this time There is a problem that the cost of constructing a temporary construction structure increases excessively and the disclosure period is delayed.

In addition, the injection hole is formed for high-pressure air injection for driving the drilling bit. However, the excavated earth and sand may flow backward to close the injection hole. In this case, since the function of the injection hole decreases, there is a problem that smooth excavation work cannot be performed.

For example, in a general drilling operation, so-called 'slime' is generated by the excavated soil inside the casing, and the injection hole (nozzle) of the excavation bit is generated by high pressure air or water pressure injected into the slime. ) Back into the high pressure fluid injection passage inside the rod, which causes a big problem in construction.

The present invention is to solve the above problems, it is an object to provide a casing device and a casing construction method that can be easily entered into the rock and the casing cap so that eccentricity does not occur during casing settlement.

In addition, in the present invention, it is easy to pour concrete by reducing the pressure feeding length of the concrete, it is possible to prevent the eccentricity to occur in the casing by preventing the concrete is deflected to one side inside the casing, can maintain the verticality of the perforation It is an object of the present invention to provide a base structure for installing a casing of a simple structure.

In addition, it is an object of the present invention to provide a fabric mill to prevent back excavated soil and water back to the injection hole.

In order to achieve the above object, in the present invention, a casing apparatus for underwater foundation, the inside of the tubular casing is hollow, both ends in the axial direction is opened and the bottom surface is inserted directly facing the ground, and the upper surface of the casing It includes a casing cap installed in; The casing cap includes: an upper plate blocking the upper portion and a side plate extending downward from the circumference of the upper plate and having a lower end facing the upper end surface of the casing and being directly in contact with a face-to-face; The upper surface of the upper surface of the casing cap, the vibration and load is applied to the casing cap without directly hitting or vibrating the upper plate of the casing cap, and the applied vibration and load is distributed through the upper plate and the side plate of the casing cap and transmitted to the casing An anti-eccentric beam is further installed; On the outer circumferential surface of the casing, a plurality of injection pipes are installed at equal intervals in the circumferential direction in a direction parallel to the casing, and at the lower end of the injection pipe, a high pressure fluid injected into the injection pipe is injected to spray the earth or sand under the casing. The present invention provides a casing apparatus for an underwater foundation, characterized in that an injection nozzle for rinsing the sandstone is provided.

In addition, in the present invention, the tubular casing is mounted, the upper end of the casing is made of a tubular shape provided with an upper plate, the upper surface of the upper plate is fixed and installed with a casing cap provided with an eccentricity prevention beam made of steel By applying vibration to the eccentricity prevention beam of the casing cap, the overall vibration and load applied to the casing through the upper plate and the eccentricity prevention beam is distributed, and the body of the casing is fixed with a guide member to secure the seating position of the casing. By fixing, a casing construction method for preventing eccentricity of the casing is provided.

In addition, the outer circumferential surface of the casing is provided with a spray pipe in the longitudinal direction, and the lower end of the spray pipe is provided with a spray nozzle, to scour the soil, sand, gravel and sandstone layer and weathered rock layer by spraying a high pressure liquid or gas. It provides a casing characterized by.

In addition, in the present invention as a seat to be fixed and installed on the outer peripheral surface of the casing, it is made of a variety of plate shape having a certain thickness, a hollow is formed in the center so that the casing is inserted, the connecting device for connecting between the lower base and the casing It provides a base structure of the casing, characterized in that fixed to the outer peripheral surface of the casing.

In addition, in the present invention, the seat is made of a perforated plate to reduce its own weight, and provides a base structure of the casing, characterized in that the bracing is installed inside the perforated plate to reinforce the strength.

In addition, in the present invention, a drilling device for drilling soft rock or rock layer, consisting of a rotary motor, a rod and a hammer bit, the hammer bit is provided at the bottom of the rod connected to the rotary motor, the bottom of the rod is excavated A nozzle for spraying high pressure liquid or gas is installed to disperse the soil and rock debris, and a check valve is installed in the middle of the rod to prevent backflow of the excavated soil and rock debris. do.

According to the present invention, since vibration and load transmitted to the casing by the casing cap are uniformly distributed throughout the casing, eccentricity does not occur in the casing, and the soil, sand, and gravel are pushed by the high-pressure spraying device installed on the casing outer periphery. As a result, the settlement process of the casing becomes smooth.

In addition, since concrete is placed on a pedestal fixed and installed on the outer circumference of the casing, concrete can be reduced in length, and the arrangement of small equipment can be freely adjusted, so that the placement of concrete within the casing is not deflected. You can do that.

In particular, when the drilling equipment is placed on the pedestal and the interior of the casing is drilled, the drilling equipment is stably fixed, which has the advantage of maintaining the verticality of the drilling precisely.

Further, in the present invention, by installing a check valve in the middle of the rod of the drilling bit equipment, it is possible to prevent the excavated soil and water to enter the nozzle and back flow.

Hereinafter, with reference to the accompanying drawings will be described a specific configuration and effect of the casing device, the seat structure and the drilling device according to the present invention.

2A and 2B are schematic perspective views illustrating a casing cap 20 installed in a casing 10 and a casing 10 in a casing cap 20 installed in a casing apparatus according to an embodiment of the present invention. Is shown. In addition, Figure 2c and Figure 2d is a view along the line AA and BB of Figure 2b, respectively, a schematic side cross-sectional view of the casing 10 is installed, the casing cap 20 according to an embodiment of the present invention is shown, 2E is a schematic side view showing the casing 10 of the present invention being inserted.

As shown in FIG. 2A, the casing 10 is formed of a tubular steel pipe having an empty inside and opening at both ends of an axial direction thereof in an outer circumferential surface of the steel pipe. The injection pipe 12 is connected to the lower portion of the casing 10 in the longitudinal direction. In addition, when the casing 10 is seated on the weathered rock layer, the casing cap 20 is installed at the upper end of the casing 10 to cover the upper end of the casing 10.

Looking at a specific configuration of an embodiment of the casing cap 20 with reference to Figures 2a to 2d, the casing cap 20 is the top plate 23 and the top plate that can cover the upper portion of the casing (10) 23 is provided with a side plate 24 extending downward from the top and the circumference is closed and the bottom surface of the side plate 24 is formed in the shape of a lid facing the upper surface of the casing 10 directly in contact with the face-to-face The outer circumferential surface is provided with a lifting ring 22, and an eccentric prevention beam 21 is provided on the upper surface. According to the structure in which the side plate 24 of the casing cap 20 directly contacts the upper surface of the casing 10 with a face-to-face, as shown in the drawing, the driving force or vibration force applied to the casing cap 20 is the casing ( While most of the casing 10 is transmitted without loss, the casing 10 is immediately inserted without being skewed evenly throughout the circumference of the casing 10.

As described above, when the casing cap 20 having the upper plate 23 is closed and the upper surface of the casing 10 is configured to come into contact with the entire upper surface of the casing 10 through the side plate 24, the casing is subjected to vibration and load. Since the top plate 23 and the side plate 24 of the cap 20 can be evenly distributed throughout the circumference of the casing 10, the casing 10 can be prevented from tilting. At this time, when the eccentricity prevention beam 21 is further installed on the upper plate 23 of the casing cap 20, by using the eccentricity prevention beam 21 instead of the upper plate 23, it is easy to fix the driving equipment or vibration equipment It is possible to directly drive or vibrate the eccentric prevention beam 21, so that it is easy to apply the driving or vibration to the casing cap 20 and the casing 10, so that the settlement process of the casing 10 can be performed more easily. In addition, since driving or vibration is not directly applied to the casing cap 20 and the casing 10, direct damage to the casing cap 20 and the casing 10 may be prevented. In addition, the vibration and load applied to the anti-vibration beam 21 is distributed through the upper plate 23 and the side plate 24 of the casing cap 20 is uniformly transmitted throughout the circumference of the casing 10, so that the casing 10 The eccentricity of can be prevented more effectively.

As shown in Figure 2a to 2c, the lifting ring 22 is provided on the outer peripheral surface of the casing cap (20). It is easy to mount on the upper end of the casing 10 because it can be carried by lifting the casing cap 20 by the equipment such as crane to the lifting ring (22).

Meanwhile, in FIGS. 2B to 2D, the lower surface of the side plate 24 and the upper surface of the casing 10 are coupled to each other by welding. However, the present invention is not limited thereto and the casing cap may be formed by various methods. 20 may be fixed to the casing 10. As shown in the figure, in the case where the bottom surface of the side plate 24 of the casing cap 20 and the top surface of the casing 10 are welded, the casing may act even when the reaction is applied from the casing 10 when applying driving or vibration. The cap 20 may be prevented from being detached or shaken, and thus, the transmission of the driving force and the vibration may be completely performed, and the insertion operation of the casing 10 may be easily and quickly performed.

2A, 2B, and 2D, the above-described injection pipes 12 are disposed in parallel with the casing 10 while being arranged at equal intervals on the outer circumference of the casing 10. In addition, an injection nozzle 13 is installed at the lower end of the injection pipe 12. When a high pressure fluid (water or air) is injected through the injection nozzle 13, the earth and sand under the casing 10 are discharged. , The gravel, sandstone layer, weathered rock layer and the like (hereinafter referred to as 'soil' in the following description and claims) are scoured, so that the casing 10 can be settled more easily. In addition, since the injection pipe 12 and the injection nozzle 13 are arranged to maintain the same interval around the circumference of the casing 10, it is possible to uniformly wash the lower portion of the casing 10 to prevent the eccentricity of the casing 10 can do.

As shown in FIG. 2D, in order to prevent water or soil from flowing back into the injection pipe 12 through the injection nozzle 13, it is preferable to install a check valve 14 on the top of the injection nozzle 13. desirable. On the other hand, the casing 10 may be in the shape of a sharp tip 11 so that the casing 10 is more easily settled in the soft rock layer.

Figure 2e is a schematic side view showing a state in which the casing 10 of the present invention is inserted, the vibration is applied to the entire casing 10 by connecting the crane to the eccentric prevention beam 21. At this time, if the casing (10) body is not fixed, the casing (10) can not maintain the vertical, as shown, the guide member (5) connected to the fixed base (4) of the crane to the body of the casing (10) It is preferable to fix it and apply vibration.

FIG. 3A is a schematic perspective view of a seat structure 30 of the present invention for installing a casing 10 and performing an operation such as excavation, and FIG. 3B is a schematic perspective view showing the seat structure 30 of the present invention. to be. 3C and 3D are schematic perspective and bottom views showing a structure in which the seat structure 30 of the present invention is installed on the outer circumferential surface of the casing 10, respectively, and FIG. 3E is a view in which the seat structure 30 of the present invention is used. Is a schematic side cross-sectional view.

As shown in FIG. 3A, the pedestal structure 30 is installed around the outer circumference of the casing 10. The seat structure 30 of the present invention is disposed on the outer peripheral surface of the upper end of the casing 10 is fixed to the underwater ground. As shown in FIG. 3E, the construction equipment for driving, drilling, concrete placing, etc. may be placed on the pedestal structure 30, and concrete pouring and drilling work may be performed from the settlement work of the casing 10. Thus, according to the base structure 30 of the present invention, unlike the prior art, it is possible to secure a suitable working space around the outer periphery of the casing 10, and to place the construction equipment in the secured working space, The construction can be carried out while preventing the eccentricity of the casing 10 more completely, and the work such as driving, drilling and concrete pouring can be performed very easily, and furthermore, to reduce the installation cost or period of the temporary facility. do.

As shown in FIG. 3A to FIG. 3D, the seat structure 30 may be formed in the form of a deck-like deck 30a having a predetermined thickness in the shape of a polygon or a circle. A hollow 31 having a size corresponding to the outer circumferential surface of the casing 10 is formed at the center of the casing 10 so as to be inserted into the casing 10. In addition, an insertion hole 33 may be formed in the deck 30a of the pedestal structure 30 so that the reinforcement pile 34 may be inserted and installed, and when the deck 30a is manufactured in the insertion hole 33, If the sleeve is inserted in advance, installation of the reinforcement pile 34 can be made easier. The reinforcement pile 34 is preferably disposed at the edge of the deck 30a, that is, the corner portion or the vertex portion, in order to uniformly support the deck 30a. Insert the reinforcement pile 34 through the insertion hole 33 formed in the deck (30a), or directly fixed to the ground or by anchoring the anchor and tension leg embedded in the ground, and then the reinforcement pile 34 and the insertion hole The space between the (33) can be welded to integrate. As such, when the reinforcement pile 34 is installed to support the deck 30a, even if the heavy equipment is placed on the deck 30a, the eccentricity and inclination of the deck 30a can be prevented, and Stable work is possible.

On the other hand, in the seat structure 30 of the present invention, the deck 30a may be manufactured in the form of a hollow plate between the upper plate and the lower plate in order to reduce the weight, in this case, as shown in Figure 3b braces inside the plate It is preferable to provide a brace 32 to reinforce the strength.

The seat structure 30 may be fixed by restraining the casing 10 by various connecting devices such as a contracting device and a connection method. 3C to 3E show an embodiment in which the hydraulic cylinder 40 is installed below the deck 30a as an example of the connecting device 40a for restraining and fixing the casing 10.

Specifically, referring to FIGS. 3C and 3D, which look up the pedestal structure 30 from below, the hydraulic cylinder 40 is installed on the lower surface of the deck 30a and the hydraulic cylinder 40 is connected to the casing 10. When pressed to press the outer periphery of the casing 10 by pressing the casing 10, the casing 10 is firmly fixed to the pedestal structure 30 via the hydraulic cylinder 40. At this time, it is preferable to install the shock absorbing member 41 at the end of the hydraulic cylinder 40 in contact with the outer circumferential surface of the casing 10. In addition, in order to facilitate installation of the hydraulic cylinder 40, it is preferable to install the bracket 42 on the deck 30a so that the hydraulic cylinder 40 can be fixed. In addition to supporting the hydraulic cylinder 40, the bracket 42 may be directly connected to the outer circumferential surface of the casing 10 so that the casing 10 may be directly fixed to the deck 30a.

As shown in FIG. 3E, when the fixing of the casing 10 is completed, the drilling device 60 may be raised on the deck 30a to excavate the inside of the casing 10, and thus the operation may be performed without a large and complex facility. It can be done easily. It is natural that not only the drilling device 60 illustrated in FIG. 3e but also the driving equipment or concrete pouring equipment may be placed on the pedestal structure 30.

Next, FIG. 4A shows a schematic diagram of a drilling device 60 for drilling the inside of the casing 10, and FIG. 4B is provided with a check valve 64 in the middle of the rod 62 of the drilling device 60. A diagram showing the state is shown.

After the casing 10 is seated on the soft rock layer, the rock layer inside the casing 10 is excavated to a desired depth by using the drilling device 60. Figure 4a is a side view of the support 50 is installed on top of the casing 10, the drilling device 60 is placed thereon. The drilling device 60 may be mounted on the pedestal 30 as shown in FIG. 3e to perform the drilling operation.

The punching device 60 is mainly provided with a bit (or hammer bit) 63 at the end of the rod 62 rotated by the motor 61, in order to smooth operation of the bit 63 in the excavation process Slime, such as soil and stone powder, which have occurred should be removed. A nozzle (injection hole) is formed at a lower end of the rod 62 in which the bit 63 is installed in order to remove the slime of the earth and sand. In the present invention, in order to prevent soil, water, etc. excavated by the bit 63 from flowing back through the nozzle, as shown in FIG. 4B, a check valve is located in the middle of the high-pressure fluid injection passage 65 of the rod 62. Install (64). The check valve 64 induces the flow of the fluid in only one direction, and closes the high pressure fluid injection passage 65 by closing when the pressure of the supplied high pressure fluid is low, thereby preventing backwater or water from flowing back. have. In addition, as shown in FIG. 4B, when the check valve 64 is provided at a plurality of locations, backflow can be blocked more reliably in several steps, and further, between the check valve 64 and the check valve 64. Leakage can also be easily checked.

1 is a schematic cross-sectional view showing a state of sinking the casing by the conventional technology.

2A and 2B are schematic perspective views showing a casing cap is installed according to an embodiment of the present invention.

Figures 2c and 2d is a view along the lines A-A and B-B of Figure 2b, respectively, is a schematic side cross-sectional view of the casing is provided with a casing cap according to an embodiment of the present invention.

Figure 2e is a schematic side view showing a state in which the casing device of the present invention is installed.

Figure 3a is a schematic perspective view of the casing structure of the present invention installed on the casing.

3B is a schematic perspective view showing the seat structure of the present invention.

3C and 3D are schematic perspective and bottom views respectively showing a structure in which the seat structure of the present invention is installed on the outer peripheral surface of the casing.

Figure 3e is a schematic side cross-sectional view showing the use of the seat structure of the present invention.

4A is a schematic diagram of a drilling device for drilling the inside of a casing.

4B is a view schematically showing a state in which a check valve is installed in the middle of a rod.

<Description of the symbols for the main parts of the drawings>

10 casing 12 injection pipe 13 injection nozzle

20: casing cap 21: eccentric beam 22: tow hook

23: top plate 24: side plate

30: base structure 30a: deck 31: hollow

32: brace 33: insertion hole 34: reinforcement pile

40a: connecting device 40: hydraulic cylinder 41: buffer member

42: bracket

60: drilling device 61: rotary motor 62: rod

63: bit 64: check valve

65: high pressure fluid inlet passage

Claims (2)

As a base structure installed around the casing 10, A deck 30a disposed around the outer circumference of the casing 10, A reinforcement pile (34) connected to the deck (30a) to support the deck (30a); In the center of the deck 30a is formed a hollow 31 into which the casing 10 is inserted, The deck structure (30a), restraint structure characterized in that the coupling device (40a) for restraining the casing (10) is fixed to the deck (30a) is installed. The method of claim 1, The deck 30a is made of a perforated plate to reduce its own weight, A pedestal structure, characterized in that the bracing for reinforcement (32) is installed inside the perforated plate.

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