KR100789210B1 - Land-side protection wall using composite pile connected two piles in a body - Google Patents

Abstract

An earth retaining method using sheet piles and composite girders is provided to increase the depth of excavation for self-supporting construction by resisting displacement and stress sufficiently, and to construct a civil engineering structure and a construction structure under the ground easily. An earth retaining method using sheet piles and composite girders comprises the steps of: installing sheet piles(10) on the ground along an excavation surface in an excavation site; installing H-piles(20) to the inside of the sheet piles and the excavation surface of the excavation site at regular intervals; installing first connection members(30) between the sheet piles and the H-piles to integrate the sheet piles and the H-piles; and installing second connection members(40) between the sheet piles and the upper part of the H-piles to distribute the ground pressure added on the sheet piles to all the sheet piles.

Description

Land-side protection wall using composite pile connected two piles in a body}

1 is an installation perspective view showing a clogging method using a sheet pile and a composite beam according to an embodiment of the present invention,

Figure 2a, 2b, 2c, 2d, 2e, 2f is a construction flow chart showing a construction method using a soil pile and a composite beam according to an embodiment of the present invention,

3 is a cross-sectional view showing a sheet pile and a composite beam according to an embodiment of the present invention,

4 is a perspective view showing a composite beam (second connection member) according to an embodiment of the present invention,

5 is a perspective view illustrating various first connection members according to an embodiment of the present invention;

6 is a plan view showing a pile installation state to which the earth clogging method using the sheet pile and the composite beam according to an embodiment of the present invention,

7 is a graph showing the cross-sectional secondary moment change amount according to an embodiment of the present invention.

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

10: Sheet file 20: H-file

30: first connecting member 40: second connecting member

The present invention relates to a soil piling method using a sheet pile and a composite beam, and more specifically, to a composite pile (one sheet pile and an H-pile formed integrally) and a beam maximizing the cross-sectional coefficient of piles and strips. It can be sufficiently resistant to the displacement and stress caused by the load applied to it, which can increase the excavation depth that can be installed in a self-contained way, and improves workability and economic efficiency by not applying special methods such as material usage and anchor. Construction of civil engineering structures and building structures can be made easy, and conventional anchors and braces do not need to be installed. will be.

In general, when the construction of underground structures (earthworks) is a temporary structure that is installed in the excavated underground space to prevent the ground collapse, civil engineering is used in the construction of subways, and in the case of construction It is widely used for the construction of underground floors.

In the case of the conventional earthenware method, there is a method of installing the earth plate at the same time as the excavation based on the H-pile and inserting and digging the sheet pile.

Here, these methods do not support the increased earth pressure with the pile only as the excavation depth increases, and additionally, anchors and braces are installed to support the increased earth pressure (land pressure).

But. The use of the anchor causes an increase in construction cost and does not remove the concrete used as the grouting material even after the completion of the construction, which not only adversely affects the environment. In addition, the use of the anchor when there is an obstacle underground or there is an underground structure impossible.

In addition, when using the buttress is not economical and difficult to secure a work space, there is a problem of the settlement of the surrounding ground because it is structurally inefficient.

Accordingly, the present invention has been made to solve the above conventional problems,

Constructed by self-supporting construction by using synthetic piles (one sheet pile and H-pile formed integrally) and beams that maximize the cross-sectional coefficient of piles and strips to resist displacement and stress due to applied load such as earth pressure It is possible to increase the depth of excavation that can be done, and to improve the workability and economic efficiency by not applying special construction methods such as material usage and anchors, and to make sheet piles and composite beams that can facilitate the construction of underground civil structures and building structures. It is to provide the used soil barrier method.

In addition, the present invention does not need to install a conventional anchor, brace, etc. There is another object that can reduce the air shortening and construction costs due to the increase in workability.

The present invention has the following features to achieve the above object.

In the present invention, when the ground excavation for the construction of underground structures, in the earthquake construction method to prevent the ground collapse by minimizing the excavation surface of the excavation site,

Installing a sheet pile on the ground along an excavation surface of the excavation site;

Installing an H-pile at a predetermined distance from the inside of the sheet pile and the excavation site;

And installing the first connecting member between the sheet pile and the H-file so that the sheet pile and the H-file are formed as an integrated synthetic pile.

In addition, the present invention is the sheet pile and the pile file so as to distribute the pressure of the ground applied to the sheet pile to all sheet piles as the excavation to the basement along the excavation surface of the excavation site after completion of the sheet pile installation step and the H- pile installation step It characterized in that the sheet pile and the H- pile is integrally formed by installing a second connecting member formed of a composite beam between.

The present invention having such a feature will be more clearly described through the preferred embodiment accordingly.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as having a conventional or dictionary meaning, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

1 is a perspective view showing an installation method using a sheet pile and a composite beam according to an embodiment of the present invention, Figures 2a, 2b, 2c, 2d, 2e, 2f and the sheet pile according to an embodiment of the present invention A construction flow chart showing the construction method using a composite beam, Figure 3 is a cross-sectional view showing a sheet pile and a composite beam according to an embodiment of the present invention, Figure 4 is a composite beam according to an embodiment of the present invention (second Connection member) is a perspective view, Figure 5 is a perspective view showing a variety of first connection member according to an embodiment of the present invention, Figure 6 is a mud clogging method using a sheet pile and synthetic beam according to an embodiment of the present invention Fig. 7 is a plan view showing an applied pile installation state, and Fig. 7 is a graph showing a cross-sectional secondary moment change amount according to an embodiment of the present invention.

As shown in the figure, the soil piling method using the sheet pile and the composite beam of the present invention is to install a sheet pile (Sheet Pile) on the ground along the excavation surface of the excavation site, the inside of the excavation surface of the sheet pile 10 and the excavation site Install the H-file 20 spaced apart by a predetermined interval.

Here, the seat pile 10 installation step and the H-file 20 installation step, because it can be installed in the ground by a method commonly used in this field, detailed description thereof will be omitted.

As described above, the seat file 10 and the H-file 20 installation step may be performed by first installing a file in one row and then installing a file in another row or simultaneously. And when the pile is installed, the gap between the sheet pile 10 and the H-pile 20 can be adjusted according to the shape and excavation depth of the ground.

Here, the cross-sectional coefficient of the synthetic pile (the one in which the sheet pile and the H-pile are integrally formed) is determined by the gap. In other words, the gap between piles should be adjusted to make the displacement and stress of composite pile according to the excavation depth to be within the allowable value. This spacing increases the cross-sectional coefficient to make a considerable excavation depth earthing method. Can be.

At this time, the theoretical basis of the section coefficient is,

1. Stress (σ): The stress of the member under bending is as follows.

Therefore, the stress is inversely proportional to the cross-sectional secondary moment I, and the larger the cross-sectional secondary moment, the smaller the stress.

2. Displacement (ε) is obtained by dividing stress by elastic modulus.

3. Cross section secondary moment (I): The cross section secondary moment of the H-pile is I, height h, area A, and the distance between the sheet pile 10 and the H-pile 20 is shown in FIG. Similarly, if H, the cross-sectional secondary moment of the composite pile is as follows.

Therefore, in the case of the composite pile, the stress and the displacement are largely influenced by H, and greatly increases with reference to the graph of FIG.

FIG. 7 is a graph showing the cross-sectional secondary moment variation according to the separation distance H and the separation distance of the sheet pile 10 and the H-file 20 when the H-pile (300 * 300 * 10 * 15) is used. The cross-sectional characteristics of the sheet pile 10 and the H-pile 20 are as follows.

Cross section area (A) = 0.01198 m 2

Second Moment (I) = 0.000204 m4

That is, it can be seen that the cross section secondary moment increased from 4.6 times to 44.3 times while the separation distance H changed from 0 to 0.9.

Therefore, if the sheet pile 10 and the H-pile 20 are spaced apart at predetermined intervals, and the sheet pile 10 and the H-pile 20 are reinforced so as to be integral with the excavation, Being a member having rigidity, self-supporting construction is possible to a predetermined height.

In addition, even if the gap between the sheet pile 10 and the H-pile 20 calculates a cross-sectional coefficient that satisfies the allowable values of displacement and stress, the excavation becomes unreliable if the two piles do not move together. In addition, the sheet pile 10 and the H-pile 20 should be integrated at an interval capable of sufficiently integral behavior.

As such, when the sheet pile 10 and the H-file 20 are installed, the files of each row are connected to the connection members 30 and 40, respectively, so that the sheet pile 10 and the H-file 20 are connected. In this way, the rigidity of the retaining wall is increased and the occurrence of horizontal displacement of the retaining wall is minimized or hardly generated even after the excavation of the excavation site is completed.

In this case, the connecting members 30 and 40 used are a plurality of first connections installed between the sheet pile 10 and the H-file 20 to integrate the sheet pile 10 and the H-file 20. A second connecting member 40 formed of a composite beam is installed between the member 30 and the upper side of the sheet pile 10 and the H-pile 20.

Here, the first connecting member 30 and the second connecting member 40 to be used are formed in H shape or quadrangular shape of H shape steel, I shape steel or steel plate with reference to Figs. The attachment of the first connection member 30, the seat pile 10 and the H-pile 20 is formed of a composite member as a welding or bolt.

In addition, the second connecting member 40 is the ground applied to the seat pile 10 as the excavation to the basement along the excavation surface of the excavation site after completion of the seat pile 10 installation step and the H-pile 20 installation step The pressure is provided between the sheet pile 10 and the upper side of the H-pile 20 so as to distribute the pressure to all the sheet piles 10, which is called a band. At this time, the second connection member 40 is provided with a plurality of intermediate in the middle as the excavation surface of the excavation site underground.

The first connection member 30 installation step and the second connection member 40 installation step proceed sequentially or simultaneously, respectively, regardless of the order, the seat pile 10 installation step and the H-file 20 installation Steps may proceed sequentially or simultaneously in any order.

As described above, the soil piling method using the sheet pile and the composite beam of the present invention is the earth pressure using the synthetic pile (that sheet pile and H- pile is formed integrally) and the beam maximizing the cross-sectional coefficient of the pile and strip It can be sufficiently resistant to the displacement and stress caused by the load applied to it, so as to increase the excavation depth that can be installed in a self-contained way, and it is possible to improve the workability and economy by not using special materials such as material usage and anchor. There is an effect that can facilitate the construction of civil engineering structures and building structures.

In addition, the present invention does not need to install a conventional anchor, brace, etc. has the effect of reducing the air shortening and construction costs due to the increase in construction.

Claims (4)

In the ground excavation method to prevent the ground collapse by minimizing the excavation surface of the excavation site when the ground excavation for the construction of underground structures, Installing the sheet pile 10 on the ground along the excavation surface of the excavation site; Installing the H-pile 20 spaced apart from the sheet pile 10 by a predetermined interval inside the excavation site; And installing the first connecting member 30 between the sheet pile 10 and the H-pile 20 so that the sheet pile 10 and the H-pile 20 are formed as an integrated synthetic pile. By the way, After completion of the installation of the seat pile 10 and the installation of the H-pile 20, the excavation of the ground along the excavation surface of the excavation site as the ground pressure applied to the sheet pile 10, all the sheet pile 10 The seat pile 10 and the H-pile 20 are integrally formed by installing a second connecting member 40 formed of a synthetic beam between the seat pile 10 and the pile so as to be distributed to the first pile member. 30) and the second connecting member 40 is made of H-shaped steel, I-shaped steel and manufactured steel plate, the step of installing the first connecting member 30 and the step of installing the second connecting member 40, respectively, regardless of the order A piling method using sheet piles and synthetic beams, characterized in that can proceed sequentially or simultaneously. delete delete delete

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