KR20020089691A - The construction method of cassion basis using a coagulant - Google Patents

Abstract

PURPOSE: A construction method for an anti-scour device of a well foundation using a coagulant is provided to secure a high degree safety of the well foundation and completely eliminate defects of the well foundation such as scour. CONSTITUTION: The construction method for an anti-scour device of a well foundation(1) comprises the steps of; removing a sediment(2) located in a space(4) defined between the outer wall of the well foundation and a cut underwater rock layer(4) and on the rock layer adjacent to the space; closing the space by injecting a high density double fiber rod(10) filled with dry cement mortar(8); inserting a nozzle(18) of a coagulant injection device(16) into a plurality of injection holes(20) formed at equal distances on the fiber rod to inject a coagulant(22) such as a grouting solution.

Description

The construction method of cassion basis using a coagulant}

The present invention relates to a method of constructing a scour prevention facility based on a water well basin for a marine bridge using a coagulant, and more particularly, a predetermined portion formed between a bottom part of a well basin, that is, a bottom outer wall of a well basin, and a cut underwater rock layer. After installing the high density double geotextile rods with dry cement mortar in the spaces of the space, it is closed and filled with condensing material such as grouting liquid in the spaces to secure the foundation of the well. In addition, the present invention relates to a method of constructing a scour prevention facility based on a well for a marine bridge using a coagulant, which can fundamentally prevent defects such as scour phenomenon at the foundation of a well.

In general, civil engineering is the science and life that has existed with human history.

In English, the word Civil is used. In a dictionary, the word originally means "civilization, society."

In other words, all of civilization, history, and life of our humanity are applicable. Civil engineering includes, for example, building houses, building roads, and building structures such as dams and reservoir ports.

In modern times, the fields of ships, ships, and underground spaces are very wide and diverse.

This is where the word engineering comes, meaning engineering means getting maximum safety and effectiveness at the lowest cost.

Therefore, civil engineering has the most economical effect on the construction of all fields of society.

The detailed fields of civil engineering are as follows.

Structural engineering (bridges, buildings, railways, subways, highways, dams, ports, etc.)

Soil engineering (retaining wall, soft ground treatment, road, dam, underground structure, landfill etc.)

Hydraulic engineering (dam, sewer, water supply, dam etc.)

Environmental Engineering (Water, Wastewater, Garbage Landfill, Groundwater Pollution, Air Pollution, etc.)

Traffic engineering (railroad, subway, highway, etc.)

Surveying Engineering (Aeronautical Surveying, Satellite Surveying, Bridges, Buildings, Railways, Subways, Highways, Dams, etc.)

Here, the bridges belonging to the above-described structural engineering or survey engineering are divided into upper and lower structures, which are generally described. The upper structure is a portion directly supporting a vehicle load, which is composed of a top plate frame and a mold, and The structure is a part that transfers the load from the superstructure to the ground and is composed of shifts, piers and foundations (pile foundations, well foundations, etc.).

As such, the bridges constructed on the sea among the upper and lower bridges were not only difficult to construct, but also very difficult to maintain after construction.

In particular, as shown in FIG. 5, a predetermined space portion 6 formed between the inner diameter of the hole of the underwater rock layer 4 formed by underwater blasting in the construction step and the outer diameter of the well base 1 embedded therein is required. This is because the scour phenomenon rapidly progresses, causing problems such as settlement of the underwater rock layer 4 supporting the well base 1.

This not only significantly shortened the service life of the bridge, but also provided a cause of the problem of causing a large accident such as falling down due to a decrease in bearing capacity.

Therefore, in recent years, various methods have been sought to cure the above problems.

For reference, the healing methods that have been taken so far are the main factors influencing the scour, such as the flow velocity and depth, the width of the piers, and the size of the wells. It was to install a sandstone, a gabion, a concrete block utilizing waste concrete, and the like in a predetermined space formed in the space.

This has the advantage of securing a certain degree of stability to scour as well as construction and flexibility, economics and maintenance, there were a number of problems as follows.

If you list them in order, they are as follows.

First, when the flow velocity is rapidly accelerated due to bad weather conditions, there is a problem in that it is swept away with soil and effectively does not effectively protect the foundation of the well.

Secondly, the area swept through continuous observation due to the above-mentioned reasons has to be supplemented and installed at that time, resulting in inconvenient maintenance and uneconomical problems.

The present invention has been made in view of the conventional problems as described above, the object of which is the predetermined spacing portion formed between the bottom of the well base, that is, the lower outer wall of the well base and the cut underwater rock layer After installing the high density double geotextile rod with dry cement mortar inside, it is closed and filled with condensing material such as grouting liquid in the closed space to secure the stability of the well base. The present invention provides a method for constructing a scour prevention facility based on a well for marine bridges using coagulant to fundamentally prevent defects such as scour phenomenon.

The object of the present invention described above is that the soil is located on the outside of the well base, that is, the soil located on the underwater rock layer adjacent to the inside of the predetermined separation space formed between the bottom wall of the well and the cut underwater rock layer. A removal process for removing;

A closing process of closing the spaced apart space by launching a high density double geosynthetic fiber rod in which dry cement mortar is injected into the spaced space spaced upper part through the crane located at the work barge;

After completion of the closing process, insert the nozzle of the coagulant injection device installed on the work barge through the diver's work into the injection holes which are formed at equal intervals on the high density double geotextile rod closing the separation space. This can be achieved by injecting a coagulant, such as grouting liquid, into a certain amount and forcing it to solidify.

Figure 1a, Figure 1b is a schematic diagram showing a state taking a scour prevention construction through the scrubbing prevention facility construction method of the well for the marine bridge basin using the coagulant according to the present invention,

Figure 2 is a process chart showing a step-by-step process of the construction method of scour prevention facility of the foundation of the well for marine bridges using the coagulant according to the present invention,

Figure 3 is a plan view showing the configuration of the main components used in the construction method of scour prevention facilities of the wells for offshore bridges using the coagulant according to the present invention,

Figure 4 is an enlarged cross-sectional view showing the cross-sectional state of the main components used in the construction method of scour prevention facility of the wells for offshore bridges using the coagulant according to the present invention,

Figure 5 is a schematic diagram showing an installation state of a conventional well basin foundation.

<Explanation of symbols for main parts of the drawings>

1: well base 2: earth and sand

4: underwater rock layer 6: spaced apart

8: Dry cement mortar 10: High density double geotextile

12: work pants 14: crane

16: coagulation material injection device 18: nozzle

20: injection hole 22: coagulation material

24: Scour prevention facility 26: Transport hook

28: reinforcing band

Hereinafter, a method of constructing a scour prevention facility based on a well for a marine bridge using a coagulant according to the present invention will be described in detail with reference to the accompanying drawings.

Figure 1a, Figure 1b is a schematic diagram showing the state taking the scour prevention construction through the scrubbing prevention facility construction method of the base of the well for marine bridges using the coagulant according to the present invention, Figure 2 is a condensing material according to the present invention 3 is a process diagram showing the process of constructing a scour prevention facility based on a water well for a marine bridge using a step by step, and FIG. Figure 4 is a plan view showing the configuration of the configuration, Figure 4 is an enlarged cross-sectional view showing the cross-sectional state of the main components used in the construction method of scour prevention facilities based on the well for marine bridges using the coagulant according to the present invention.

As shown, a predetermined spacing portion formed between the earth and sand 2 located outside the well base 1, that is, between the lower outer wall of the well base 1 and the cut underwater rock layer 4 ( 6) A removal process is performed to remove the soil 2 located on the underwater rock layer 4 adjacent to the inside.

And, through the crane 14 is located on the work barge line 12 the high-density double geosynthetic fiber rod 10 in which the dry cement mortar 8 is injected into the spaced apart space 6 above the removal process is completed. By launching it takes a closing process of closing the spaced space (6).

In addition, after the closing process is completed, the dense double geotextiles closing the spaced portion 6 of the nozzle 18 of the coagulant injection device 16 installed on the work barge line 12 through the diver operation. After inserting and inserting into the injection hole 20 formed at equal intervals on the rod 10, the injection of coagulant 22 such as grouting liquid is forced to a certain amount and solidified. The facility 24 will be constructed.

On the other hand, the reinforcing band 28 is formed on the outer side of the double geosynthetic fiber rod 10, the carrying ring 26 is connected to the upper side at the same interval.

When explaining the operation and effect of the present invention to take the construction through such a process in detail as follows.

In other words, the scour prevention facility 24 constructed in a step-by-step manner is defined as a word, and the coagulation material 22, such as grouting liquid, is charged and solidified into the spaced space 6, thereby increasing the strength of the ground. It is possible to prevent the intrusion of seawater and increase the stability of the bridge for a long time by fundamentally preventing problems such as scour. To achieve this.

In addition, as described above, in forming the scour prevention facility 24 by using the step-wise process, a condensation material such as a grouting liquid in the spaced space part 6 using a specially manufactured high-density double geotextile rod 10 ( 22) can be injected quickly and easily to solidify.

Therefore, as a result, it is possible not only to achieve a function that can greatly extend the service life of the bridge, but also to prevent a large accident such as falling off caused by lowering of bearing capacity.

As described above, the present invention provides a high-density double geosynthetic fiber rod in which dry cement mortar flows into a predetermined spacing portion formed between a bottom part of a well basin, that is, a bottom outer wall of a well basin and a cut underwater bedrock layer. After installation, it is closed and filled with condensing material, such as grouting liquid, to the closed separation space to ensure the stability of the foundation of the well, and fundamentally prevent the occurrence of defects such as scour phenomenon at the foundation of the well. It is effective to give.

Claims (1)

Adjacent to the inside of the predetermined separation space 6 formed between the earth and sand 2 located outside the well base 1, ie, between the lower outer wall of the well base 1 and the cut underwater rock layer 4; A removal process of removing the soil 2 located on the underwater rock layer 4; The high-density double geosynthetic fiber rod 10 into which the dry cement mortar 8 is injected inside the spaced space part 6 on which the removal process is completed is launched through a crane 14 positioned on the work barge line 12. A closing process of closing the spaced space part 6; High density double geotextile rods 10 closing the spaced portion 6 of the nozzle 18 of the coagulant injection device 16 installed on the working barge line 12 through the diver operation after completion of the closing process. After inserting and inserting into the injection holes 20 formed at equal intervals on the top, the condensation material 22, such as grouting liquid, is injected into a predetermined amount to solidify the injection. Method of constructing a scour prevention facility based on a well for marine bridges, characterized in that the construction.