KR101686765B1

KR101686765B1 - A Construction method for the compound pile with the inner pile installed through the suction pile

Info

Publication number: KR101686765B1
Application number: KR1020160011338A
Authority: KR
Inventors: 김경선
Original assignee: 김경선
Priority date: 2016-01-29
Filing date: 2016-01-29
Publication date: 2016-12-14
Also published as: KR20160018634A

Abstract

The present invention relates to a method of constructing a composite pile having an internal pile installed through a suction pile. More particularly, the present invention relates to a method of constructing a composite pile, The slope of the structure is corrected during the construction by changing the height of the water level inside. The suction file is penetrated into the ground by pressurizing the suction pile to the bedrock by using the hydraulic press-in part while penetrating the suction file to prevent the settlement of the structure. The present invention relates to a method of constructing a composite pile.

Description

Technical Field [0001] The present invention relates to a method for constructing a composite pile having an inner pile installed through a suction pile,

The present invention relates to a composite pile passing through a suction pile, which facilitates the installation of the suction pile on the underwater ground by adjusting the height of the water level in the outer casing connected to the suction pile, The present invention relates to a method of constructing a composite pile having an inner pile installed through a suction pile for stably supporting a structure by constructing a pile.

Generally, the suction file has a structure in which the lower part is opened and the upper part is sealed. The construction method is as follows.

Once the bottom of the suction pile of the structure is seated in the waterborne ground, part of the suction pile is intruded into the ground by the weight of the structure. When intrusion of the self-weight is stopped, as shown in FIGS. 1A to 1C, the suction pump installed at the upper portion of the suction file is operated to discharge the water inside the suction file. As the water in the suction file is discharged, there is a pressure difference between the inside and the outside of the suction file, and the pressure difference causes the file to be buried in the ground.

However, according to the conventional suction file indenting method, when the water inside the file is discharged, the inside of the file is evacuated and the pressure difference between the inside and outside of the file is rapidly generated. The instantaneous pressure difference, If the file is not intrusive, and the ground is weak, there may be a problem that the ground inside the suction file rises as if it were a loom.

In addition, the diameter of the suction file is usually designed to be 6 to 12 meters. Once the file is penetrated into the ground, the horizontal resistance and the pull resistance are large. However, since the bottom of the file is installed at a position higher than the bedrock, There is a problem of insufficient resistance.

In order to solve such a problem, a 'suction file for rapid construction' of Patent Publication No. 10-2012-0074047, a 'hybrid support structure of offshore wind turbine generator' of Patent No. 10-1342445 and a base of a bucket file of a registered patent 10-0719300 A method of constructing an additional 'external foundation file' on the outside of the suction file was developed to prevent settlement of the suction file structure as disclosed in 'Construction structure and its construction method'.

The common feature of the above-mentioned 'external foundation file' method is that a pump is installed on the upper surface of the above-mentioned suction file to penetrate the suction file, and the 'external foundation file' is installed from the outside of the suction file to the bedrock, .

However, in the above method, since the coupling between the suction file and the external foundation file is accomplished in water, the quality of the coupling part deteriorates, and in order to dismantle the pump installed in the suction file, the diver must descend to a deep water depth, There is a common problem that the structure is complicated and the construction cost rises due to the structure of the 'external foundation file'. Particularly, in the 'hybrid supporting structure of an offshore wind turbine generator', a structural part to be combined with an 'external foundation file' is installed lower than the bottom of a suction file. This is problematic in that, at the beginning, the suction file interferes with the movement of the self-weight at the time of inserting the suction file, and the length of the small-diameter file that accommodates the vertical force becomes long.

KR 10-2012-0074047 A KR 10-1342445 B1 KR 10-0719300 B1

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to facilitate the control of the depth of penetration of the suction puff by adjusting the water level inside the outer casing, and to eliminate the diver operation by eliminating the existing suction pump. In addition, the suction pile penetrated into the ground is used as a pullout resistor to press-fit the inner pile into the suction pile, thereby preventing settlement of the structure and simplifying the structure as a whole, thereby achieving economical construction and reducing the construction cost.

According to an aspect of the present invention,

The suction file having at least one or more openings in which at least one portion of the suction file is opened at least one part of the suction file and an outer casing for connecting the openings are extended out of the water surface, A step of intrusion by self weight; Adjusting a water pressure inside the suction file by lowering the water level in the outer casing and penetrating the suction file into the ground using the water pressure difference in the suction file generated at this time; A step of lowering the inner pile passing through the inside of the outer casing to the ground in the suction pile after the suction of the suction pile is completed; A step of press-fitting the inner pile to a bedrock using a hydraulic press-fitting part with a reaction force end of the outer casing; And joining the inner pile and the outer casing using a bonding material of cement component after the inner pile reaches the bedrock.

Here, the suction file may further include an extension wall portion extending upward from the upper surface of the suction file.

The method of claim 1, wherein the suction pile further comprises a partition wall defining an inner space formed by the suction pail wall portion.

According to the method of constructing a composite pile passing through a suction pile of the present invention having the above-described structure, by adjusting the water level inside the outer casing connected to the upper opening of the suction pile, It is possible to easily adjust the internal water pressure. As a result, it is easy to control the penetration speed of the suction file penetrated into the ground, and the suction pump installed outside the suction file can be omitted and the diver operation can be omitted.

According to the present invention, when the suction pile of the suction file is completed, the inner pile penetrating the outer casing of the suction pile is press-fitted into the bedrock using a hydraulic press-fitting part for preventing the long-term settlement. Injection of the internal pile can be accomplished by using the suction pile embedded in the ground and the external casing as reaction force, omitting the use of large scale marine pile driving equipment for internal pile construction, can do.

According to the present invention, since the inner pile is press-fitted using the suction pressure of the suction pile penetrated into the ground, it is possible to perform a load test for confirming the supporting force of the pile when the inner pile reaches the bedrock as the supporting layer.

Further, according to the present invention, when the inner pile and the outer casing are joined using the cement-based bonding material, since the water can be removed in the outer casing, the quality of the coupling portion can be maintained well.

Also, according to the present invention, since the inner pile is coupled using the outer casing and the binder, the length of the inner pile is shortened, thereby improving the workability and reducing the material cost.

FIGS. 1A to 1C are schematic diagrams of hydraulic pressure differences in a suction file and an external pressure by an existing method.
FIGS. 2A to 2C are schematic diagrams of hydrostatic pressure generation when adjusting the water level in the outer casing of the present invention. FIG.
FIG. 3 is an illustration of a suction file underground according to the present invention. FIG.
4 is a diagram illustrating an example of vertical adjustment of a suction file according to the present invention.
5 is an illustration of an example of an inner pile passing through an outer casing according to the present invention.
FIG. 6 is a view showing an example in which an inner pile is press-fitted into a ground by using a hydraulic press-fitting unit according to the present invention.
FIG. 7 is an exemplary view showing a process for installing a bonding material according to the present invention and a process for pressurizing an internal pile simultaneously. FIG.
8 is an illustration of an example of completion of a work process according to a preferred embodiment of the present invention.
Figures 9a-b illustrate examples of a suction file further comprising an enlarged wall portion or partitions according to the present invention.

Hereinafter, a method of constructing a composite pile having an internal pile installed through a suction pile according to the present invention will be described in detail with reference to the accompanying drawings.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the function of the present invention, and may vary depending on the user, the intention or custom of the operator, and the like. Therefore, the definition should be based on the contents throughout this specification.

The density of the water exemplified in the present invention was assumed to be constant regardless of the depth of water.

FIGS. 1A to 1C illustrate the change in water pressure and the penetration of the suction paddle 10 when the suction pump is installed outside the suction paddle by the existing method to discharge the water inside the suction paddle.

The distribution of water pressure outside the suction file (1) increases linearly as the depth of water starts from the atmospheric pressure of the water surface. After the suction file 10 is not in the underwater ground, as shown in FIG. 1B, when the suction pump unit 11 installed outside the suction file is operated to discharge the water, an instantaneous vacuum state is generated in the space where the water is discharged. The water pressure distribution (2) inside the suction file is cut off from the external water pressure, so that an independent water pressure is formed. The suction pressure difference 3 in the suction file generated at this time acts on the upper part 5 of the suction file to intrude the wall part 6 of the suction file into the ground, The suction padding 10 is installed intruding into the ground until the penetration of the suction padding 10 stops.

2A to 2C illustrate a process of generating the suction pressure difference 3 in the suction file and the suction pressure difference 3 in the suction file according to the present invention differently from the conventional method, Fig.

An upper casing (5) of the suction file extends above the water surface, an outer casing (12) connecting the opening with an opening through which at least one part is open. The suction pump unit (11) is installed inside the outer casing (12). As shown in FIG. 2A, when the water level in the outer casing 12 is equal to the water level outside the suction paddle 10, there is no pressure difference in the suction padding 10 or outside. When the suction pump unit 11 is operated to lower the water level in the outer casing 12, a pressure difference 3 is generated between the external water pressure P acting on the suction pile upper part 5 and the water pressure p inside thereof . The suction file 10 is introduced into the ground by the inner and outer pressure difference 3 and the pressure difference 3 becomes larger as the water level in the outer casing 12 is lowered.

3 to 8 are operation diagrams according to a preferred embodiment of the present invention.

When the outer casing 12 of a plurality of suction files is connected by the bracing 13, it can be used as a foundation structure of a wind tower and a foundation structure of a marine facility.

FIG. 3 shows the suction of the suction pile 10 by lowering the water level in the outer casing 12 after the marine foundation is placed on the ground according to the method of the present invention. It is desirable to adjust the inclination of the suction padding 10 by adjusting the level of the inside of the outer casing 12 as shown in Fig. 4 to adjust the inclination of the suction paddle 10 during construction.

5 is an example for supplementing the disadvantage of the long term settlement that may occur due to the bottom end of the suction pile 10 not reaching the bedrock. The inner pile 14 for preventing settlement is connected to the suction pile 10) to reach the ground inside.

The work type illustrated in Fig. 6 is an operation in which the hydraulic press-fitting portion 15, which makes the outer casing 12 a reaction force, is installed on the upper end of the inner pile 14. [ In order to use the outer casing 12 of the suction paddle 10 as a reaction force body when the inner pile 14 is press-fitted, it is preferable to keep the water level in the outer casing 12 low to maintain the external water pressure P high.

Fig. 7 shows an arrangement in which the inner pile 14 is press-fitted to the bedrock and then the outer casing 12 is joined to the outer casing 12 by using the coupling material 16 made mainly of cement. On the other side, Fig. According to the embodiment of the present invention, when the inner pile 14 is press-fitted using the hydraulic press-fitting portion 15, the supporting force of the inner pile can be confirmed through the instrument panel of the hydraulic equipment (not shown) during the construction, .

8 shows a state in which the inner pile 14 is press-fitted to the bedrock and the inner pile 14 and the outer casing 12 are joined using the bonding material 16 according to a preferred embodiment of the present invention. By using the bonding material 16, the length of the inner pile can be shortened and the resistance against the horizontal load, which is an advantage of the suction pile 10, can be utilized to the maximum.

9 to 10 illustrate a feature that further includes the extension wall portion 7 and the partition wall 8 in the suction file 10 according to the embodiment of the present invention. The expansion wall portion 7 extends over the water surface from the suction pile upper portion 5 and extends in the range of the vertical supporting force of the inner pile 14 and the horizontal supporting force of the suction pile 10 for the purpose of an offshore structure such as a wall or a breakwater Can be used. The partition 8 shown in Fig. 10 divides a space formed by the wall portion 6 of the suction paddle to provide structural reinforcement. During the penetration of the suction pile 10 into the ground, as shown in Fig. 4, it can be used to correct the verticality of the structure by adjusting the internal water pressure of each space.

1: Distribution of water pressure outside the suction file
2: Distribution of water pressure inside suction file
3: Suction file inside, external water pressure car
10: Suction file (5: upper part 6: wall part 7: expansion wall part 8: partitions)
11: Suction pump section
12: External casing
13: Bracing
14: inner pile
15: Hydraulic press-
16: bonding material
P: External pressure acting on the suction file
p: internal hydraulic pressure acting on the suction file

Claims

With respect to at least one suction file whose lower portion is opened,
Placing the suction paddle having an opening through which at least one part of the suction paddle is partially opened and an outer casing connecting the opening with the suction padding extending out of the water surface,
Adjusting a water pressure inside the suction file by lowering the water level inside the outer casing and inserting the suction file into the ground using the water pressure difference in the suction file generated at this time;
Adjusting a water level in the outer casing to adjust a penetration speed of the suction pail and adjusting a tilt of the structure;
A step of lowering the inner pile to the inside of the suction pile into the outer casing after the suction pile is penetrated into the ground;
A step of press-fitting the inner pile to a bedrock using a hydraulic press-fitting part with a reaction force end of the outer casing; And
And joining the inner pile and the outer casing using a binder of cement component after the inner pile reaches the bedrock,
Wherein the outer casing is coupled to the suction pile and the permanent structure.

The method according to claim 1,
The suction file,
Further comprising an enlarged wall portion extending above the water surface in the upper portion of the suction pile.

3. The method of claim 2,
The suction file,
Further comprising a partition for partitioning an internal space formed by the wall portion of the suction pile.