KR102314877B1 - Construction method of trench-type two-row sheet pile retaining wall and retaining wall using the same - Google Patents

Abstract

Disclosed is a construction method of a trench-type two-row sheet pile retaining wall. The construction method of the trench-type two-row sheet pile retaining wall according to the present invention comprises: a first construction step in which a brace connecting a wale and a brace is installed at a preset excavation location; a second construction step in which a guide beam for driving a sheet pile is connected to the brace through a binding unit; a third construction step in which the sheet pile is guided by the guide beam for driving the sheet pile and driven to a ground; a fourth construction step in which the guide beam and the binding unit for driving the sheet pile are removed; and a fifth construction step in which the brace is connected to an upper end unit of the sheet pile by a length adjustment connector, and in which the brace is set by descending to a preset excavation cross-section by its own weight as excavation proceeds at a preset excavation position. An object of the present invention is to provide the construction method of the trench-type two-row sheet pile retaining wall so as to reduce a depth of excavation by eliminating a lower working space, and a retaining wall using the same.

Description

Construction method of trench-type 2-row sheet pile retaining wall and retaining wall using the same

The present invention relates to a construction method of a trench-type two-row sheet pile retaining wall and a retaining wall using the same, and more particularly, to a temporary guide part on the outside of a brace in which a wale and a brace are integrated, driving the sheet pile, and temporarily The present invention relates to a construction method of a trench-type two-row sheet pile retaining wall, which allows the retainer to descend completely to an excavation surface after removing a guide part, and a retaining wall using the same.

In general, excavation work having a depth below the ground is performed to build underground structures such as concrete boxes for sewage pipes, electrical communication lines, and subways, and during the excavation work, soil flows down or the ground collapses. In order to prevent this, a protective wall must be installed and a water-blocking operation must be carried out to block the inflow of groundwater leached from the ground into the construction area.

In the case of the waterproofing work and the installation of the protective wall for retaining, many construction methods have been implemented in the past, but recently, the construction method of installing the protective wall using a sheet pile to have both the water-repellent function and the retaining function has become common.

The 2-row sheet pile retainer is a retainer to prevent the collapse of a narrow excavation section in the form of a trench in a soft ground or an area with high groundwater, and is widely used in sewerage work and waterworks work.

The first excavation part of the 2nd row sheet pile retaining wall corresponds to the cantilever structure as shown in FIG. 1A, and the maximum horizontal displacement by the external horizontal earth pressure is generated at the ground surface position, and is obtained through the following Equation 1.

where δ is the horizontal displacement of the sheet pile by the principal earth pressure (Pa1) acting from the ground surface to the first excavation surface, Pa1 is the main earth pressure acting from the ground surface to the first excavation surface, La1 is the primary earth pressure from the ground surface to the first stage excavation surface (Pa1) Distance to the point of action, E is the elastic modulus of the sheet pile, and I is the second moment of section of the sheet pile.

Through Equation 1, it can be seen that as the first stage excavation depth h1 increases, the main earth pressure Pa1 also increases in proportion to it, and the horizontal displacement amount δ of the sheet pile increases. Here, the first-stage excavation depth is the distance including the lower working space below the position of the first-stage brace.

On the other hand, the rooting depth of the sheet pile retaining wall refers to the depth below the final excavation surface as shown in FIG. 1A, and can be obtained through the following Equation (2).

Here, Pa2 is the back side main earth pressure from the lowest brace to the seat pile penetration depth, La2 is the distance from the lowest brace to the rear side main earth pressure (Pa2) acting point, Ma2 is the main moving moment acting on the lower part based on the lowest brace. means,

Pp2 is the passive earth pressure on the excavation side from the final excavation surface to the penetration depth, Lp2 is the distance from the lowest brace to the passive earth pressure (Pp2) action point, Mp2 is the passive moment resisting the lower part based on the lowest brace, and SF is the safety factor. it means.

Through Equation 2, the penetration depth of the sheet pile retaining wall with braces should be greater than or equal to the value in consideration of the safety factor than the passive moment, and the closer the bottom brace is to the excavation surface, the smaller the value of the back side acting moment. It can be seen that the insertion depth also decreases accordingly.

In the conventional two-row sheet pile retaining method, it is difficult to keep the width of the excavation section constant by driving the first and second rows separately without constraining the distance between the two rows of sheet piles uniformly. The installation proceeded in the order of the installation of the wale support, the installation of the wale, and the installation of the brace.

The conventional two-row sheet pile retaining method requires an additional lower working space for attaching the wale support to the sheet pile as shown in FIG. There was a problem with this excessive increase.

In order to solve this problem, a method of upwardly adjusting the position of the first stage brace is also proposed. In this method, the braces such as the second stage and the third stage are also upwardly adjusted at the same time, and as a result, the bracing is added compared to the total excavation depth. or by increasing the depth of penetration of the sheet pile, there was a problem of increasing the construction cost or the construction period.

Republic of Korea Patent No. 10-1688048 (2017.01.02)

The present invention has been devised to solve the problems of the prior art, and as excavation proceeds, the lower working space can be eliminated by allowing the brace connected to the upper end of the sheet pile to go down by its own weight or external force, thereby reducing the depth of excavation. An object of the present invention is to provide a construction method of a trench-type two-row sheet pile retaining wall and a retaining wall using the same.

The construction method of the trench-type two-row sheet pile retaining wall according to an embodiment of the present invention for solving the above-described technical problem is a first construction step in which a brace connecting a wale and a brace is installed at a preset excavation location; a second construction step in which a guide beam for driving a sheet pile is connected to the brace through a binding part; A third construction step in which the sheet pile is guided by the guide beam for driving the sheet pile and driven to the ground; a fourth construction step in which the sheet pile driving guide beam and the coupling part are removed; And the brace is connected to the upper end of the sheet pile by the length adjustment connector, and the brace is set by descending to a preset excavation cross-section by its own weight as the excavation at the preset excavation position proceeds. construction stage; may include.

In the first construction step, the brace is provided in a rectangular shape when viewed in a plan view, and a pair of facing ribs is connected to the brace by a preceding load jack.

In the second construction step, the guide beam for driving the sheet pile is provided adjacent to the outside of each wale, and the wale and the guide beam for driving the sheet pile are bound through the 'C'-shaped binding part. do it with

The wale is set on the ground surface within the preset excavation position, the guide beam for driving the sheet pile is set on the ground surface outside the preset excavation position, and the binding unit surrounds the wale and the guide beam for driving the sheet pile while It is characterized in that it is penetrated into the ground from the ground surface to a preset depth.

The sheet pile is guided and driven by the wale and the guide beam for driving the sheet pile, inserted into the ground, and connected to the adjacent sheet pile.

The sheet pile is provided so that the protrusion and the concave portion alternately, the protrusion is characterized in that it is provided to be adjacent to the wale.

In the fifth construction step, the length adjustment connector is characterized in that it is connected to the upper end of the sheet pile and the concave portion.

The length adjustment connector includes: a first horizontal fastening part connected to the upper end of the sheet pile; a turnbuckle part connected to the first horizontal fastening part; a chain connecting portion connected to a lower portion of the turnbuckle; and a second horizontal fastening unit connected to the wale while being connected to the chain connecting unit.

It is characterized in that the length of the length adjustment connector is adjusted through the turnbuckle part and the chain connection part.

According to another embodiment of the present invention, it is possible to provide a retaining wall using the construction method of the trench-type two-row sheet pile retaining wall.

According to the present invention, the bracing in which the wale and the brace are integrated is positioned inside the preset excavation position, and as it is driven by binding it with the guide beam for driving the sheet pile on both sides of the outside of the brace, the linearity and the excavation section of the sheet pile may be kept constant.

In addition, according to the present invention, by excavating the brace that integrates the wale and the brace with the length adjustment connector on the top of the sheet pile, and naturally lowering the brace to a position determined by its own weight or a little external force, the conventional It is possible to eliminate the lower working space required for the installation of the wale support, thereby reducing the excavation depth to the first stage corresponding to the cantilever structure, thereby reducing the horizontal displacement of the sheet pile.

In addition, according to the present invention, it is possible to lower the vertical position of the first stage of the brace in which the wale and the brace are integrated to the depth of the lower working space required for the conventional wale pedestal installation, and the vertical position of the lowermost brace is also lowered at the same time. As a result, the depth of entry of the sheet pile is reduced, thereby reducing the construction cost and construction period.

In addition, according to the present invention, it is possible to closely contact the brace and the sheet pile in which the wale and the brace are integrated, so that the filling of the groove between the sheet pile and the wale is not required or can be minimized.

1a is a conceptual diagram of the displacement and earth pressure of the sheet pile;
Figure 1b is a construction photographic drawing of a conventional trench-type two-row sheet pile,
Figure 2 is a flowchart showing the construction process of the construction method of the trench-type two-row sheet pile retaining wall according to an embodiment of the present invention;
3 is a plan view showing the structure of a brace for implementing a construction method of a trench-type two-row sheet pile retaining wall according to an embodiment of the present invention;
Figure 4 is a cross-sectional view showing the structure of the brace of Figure 3;
5 is a plan view showing the connection relationship between the brace and the seat pile driving valued beam for the construction method of the trench-type two-row sheet pile retaining wall according to an embodiment of the present invention;
6 is a cross-sectional view showing the connection relationship between the brace of FIG. 5 and the guide beam for driving the seat pile;
7 is a plan view showing a connection structure of a brace and a sheet pile for a construction method of a trench-type two-row sheet pile retaining wall according to an embodiment of the present invention;
8 is a cross-sectional view showing the connection structure of the brace and the sheet pile of FIG. 7;
9 is a detailed view showing the connection structure of the brace and the sheet pile in detail.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art can easily implement them. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

Throughout the specification, when a part "includes" a certain element, it means that other elements may be further included, rather than excluding other elements, unless otherwise stated.

Hereinafter, the construction method of the trench-type two-row sheet pile retaining wall according to an embodiment of the present invention will be described in detail with reference to the drawings.

Referring to Figure 2, in the construction method of the trench-type two-row sheet pile retaining wall according to the embodiment of the present invention, the brace 100 that connects the wale 110 and the brace 120 to the preset excavation position. A first construction step to be installed (S110), a second construction step (S120) in which the guide beam 300 for driving a sheet pile is connected to the brace 100 through a binding portion 400 (S120), a sheet pile for driving a sheet pile A third construction step in which the guide beam 300 is guided by the guide beam 300 and driven to the ground (S130), a fourth construction step in which the guide beam 300 and the binding part 400 for driving the sheet pile are removed (S140), the brace ( 100) is connected to the upper end of the sheet pile 200 by the length adjustment connector 500, and the brace 100 is a preset excavation cross-section 30 by its own weight as excavation at a preset excavation position proceeds. ) includes a fifth construction step (S150) set by descending.

The preset excavation position is a part corresponding to the ground surface 10 in the preset excavation position of FIGS. 6 and 8 , and this part is the ground located between the sheet piles 200 . Outside the preset excavation position is provided with a ground surface 20 outside the excavation scheduled position.

When the excavation of the ground proceeds at a preset excavation position, the first excavation surface 30 may be formed as shown in FIG. 8 , and when the excavation proceeds, the final excavation surface 40 may be formed.

In the first construction step (S110), the brace 100 is provided in a rectangular shape in a plan view, and a pair of facing wales 110 is connected by the brace 120 and the preceding load jack 130. .

The wale 110 and the brace 120 may be made of H-beam or I-beam steel, and the lower surface of the lower flange (not shown) of the brace 120 is set to surface contact with the ground surface 10 within the preset excavation position. do. In addition, the wale 110 is set so that any one of the upper flange and the lower flange is coupled to the end of the brace 120, and the normal of the abdomen (not shown) of the wale 110 is the ground surface ( 10) is provided to be parallel to the direction or the direction opposite to the ground surface 10 .

In the second construction step (S120), the guide beam 300 for driving the sheet pile is provided adjacent to the outside of each wale 110, and the wale 110 and the guide beam 300 for driving the sheet pile are 'c' It is bound through the binding part 400 in the shape of a ruler.

That is, the guide beam 300 for driving the sheet pile is provided by being spaced apart by a preset interval to the outside of each wale 110 , and the guide beam 300 for driving the sheet pile is preset in a shape corresponding to the wale 110 . It may be set on the ground surface 20 outside the planned excavation location.

Here, the preset interval is a length corresponding to the width of the sheet pile 200, and by this arrangement, the sheet pile 200 is guided by the wale 110 and the guide beam 300 for driving the sheet pile to be driven into the ground. can

The sheet pile 200 is provided such that the protrusion 210 and the concave portion 220 are alternately provided, and the protrusion 210 is provided to be adjacent to the wale (110). The protrusion 210 and the concave portion 220 may be connected by a connecting portion 230 .

The binding part 400 is formed in a 'C' shape, and is inserted into the ground from the ground surface to a preset depth while enclosing the wale 110 and the sheet pile driving guide beam 300 . The binding part 400 is a sheet The guide beam 300 for pile driving and the wale 110 extend from the lower portions of both ends of the horizontal portion 410 and the horizontal portion 410 in contact with the upper portion of the wale 110, and the guide beam 300 and the wale 110 for driving the sheet pile are in contact with the wale 110. It includes a vertical portion 420 provided to do so.

A guide beam 300 for driving a sheet pile is provided between the vertical part 420 and the sheet pile 200 provided on the ground surface 20 outside the preset excavation position, and provided on the ground surface 10 inside the preset excavation position. A bandage 410 is provided between the vertical portion 420 and the sheet pile 200 .

In the third construction step (S130), the sheet pile 200 is guided and driven by the wale 110 and the guide beam 300 for driving the sheet pile, inserted into the ground, and connected to the adjacent sheet pile 200.

Since the binding part 400 holds the position of the guide beam 300 and the wale 110 for driving the sheet pile driving and binds them so as not to move in the lateral direction, the sheet pile 200 is stably guided and approaches the ground. can be

After the sheet pile 200 is retracted to the desired position, the guide beam 300 and the binding portion 400 for driving the sheet pile in the fourth construction step (S140) are removed.

In the fifth construction step (S150), the length adjustment connector 500 is connected to the upper end of the sheet pile and the concave portion 220 . The length adjustment connector 500 is provided on the outer surface of the wale 110 of the brace 100, and the length adjustment connector 500 provided on each wale 110 to be connected to the recess 220 is corresponding to each other. It is free even if it is not provided in the location.

The reason that the length adjustment connector 500 is provided in the concave portion 220 is that when the wale 110 is set on the first excavation surface 30 or the final excavation surface 40 , the wale 110 is the convex portion 210 ) because it must be welded while in contact with or in surface contact with the convex portion 210 .

The length adjustment connector 500 is a first horizontal fastening part 510 connected to the upper end of the sheet pile 200 , a turnbuckle part 520 connected to the first horizontal fastening part 510 , and a lower portion of the turnbuckle part 520 . It includes a chain connection part 530 connected to the chain connection part 530 and a second horizontal fastening part 540 connected to the band length 110 while being connected to the chain connection part 530 .

The first horizontal fastening part 510 includes a rectangular body 511 and a groove 513 provided at one end of the body 511 for coupling to the sheet pile 200, and the other side of the body 511 is provided. A turnbuckle part 520 provided in the vertical direction is coupled to the end.

The length of the length adjustment connector 500 can be adjusted by the turnbuckle part 520 and the chain connection part 530 , and the fine height of the length adjustment connector 500 is adjusted through the turnbuckle part 520 and the chain connection part 530 ), the overall height of the length adjustment connector 500 can be adjusted.

When the brace 100 is set and fixed on the first excavation surface 30, if the first to fifth construction steps are repeated while excavating until the final excavation surface 40, the final excavation surface ( 40), the brace 100 may be set and fixed.

According to the present invention, the bracing in which the wale and the brace are integrated is positioned inside the preset excavation position, and as it is driven by binding it with the guide beam for driving the sheet pile on both sides of the outside of the brace, the linearity and the excavation section of the sheet pile may be kept constant.

In addition, according to the present invention, by excavating the brace that integrates the wale and the brace with the length adjustment connector on the top of the sheet pile, and naturally lowering the brace to a position determined by its own weight or a little external force, the conventional It is possible to eliminate the lower working space required for the installation of the wale support, thereby reducing the excavation depth to the first stage corresponding to the cantilever structure, thereby reducing the horizontal displacement of the sheet pile.

In addition, according to the present invention, it is possible to lower the vertical position of the first stage of the brace in which the wale and the brace are integrated to the depth of the lower working space required for the conventional wale pedestal installation, and the vertical position of the lowermost brace is also lowered at the same time. As a result, the depth of entry of the sheet pile is reduced, thereby reducing the construction cost and construction period.

Finally, according to the present invention, it is possible to closely contact the brace and the sheet pile in which the wale and the brace are integrated, so that the filling of the groove between the sheet pile and the wale is not required or can be minimized.

The description of the present invention described above is for illustration, and those of ordinary skill in the art to which the present invention pertains can understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. For example, each component described as a single type may be implemented in a dispersed form, and likewise components described as distributed may be implemented in a combined form.

The scope of the present invention is indicated by the following claims rather than the above detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention. do.

100: brace
200: sheet file
300: guide beam for driving a sheet pile
400: binding part
500: length adjustment connector

Claims (10)

A first construction step in which a brace connecting a wale and a brace is installed at a preset excavation location; a second construction step in which a guide beam for driving a sheet pile is connected to the brace through a binding part; A third construction step in which the sheet pile is guided by the guide beam for driving the sheet pile and driven to the ground; a fourth construction step in which the sheet pile driving guide beam and the coupling part are removed; And the brace is connected to the upper end of the sheet pile by the length adjustment connector, the brace is set by descending to a preset excavation cross-section by its own weight as the excavation at the preset excavation position proceeds. construction stage; including,
In the first construction step, the brace is provided in a rectangular shape when viewed in a plan view, and a pair of facing wales are connected to the brace by a preceding load jack,
In the second construction step, the guide beam for driving the sheet pile is provided adjacent to the outside of each wale, and the wale and the guide beam for driving the sheet pile are bound through the 'C'-shaped binding part, and the The wale is set on the ground surface within the preset excavation position, the guide beam for driving the sheet pile is set on the ground surface outside the preset excavation position, and the binding portion surrounds the wale and the guide beam for driving the sheet pile on the ground surface A construction method of a trench-type two-row sheet pile retaining wall, characterized in that it is rooted into the ground from a preset depth. delete delete delete According to claim 1,
In the third construction step, the sheet pile is guided and driven by the wale and the sheet pile driving guide beam, inserted into the ground, and connected to the adjacent sheet pile. construction method. According to claim 1,
The sheet pile is provided so that the protrusion and the concave portion are alternately provided, and the projecting portion is provided so as to be adjacent to the wale. 7. The method of claim 6,
In the fifth construction step, the length adjustment connector is a construction method of a trench-type two-row sheet pile retaining wall, characterized in that it is connected to the upper end of the sheet pile and the recess. 8. The method of claim 7,
The length adjustment connector includes: a first horizontal fastening part connected to the upper end of the sheet pile; a turnbuckle part connected to the first horizontal fastening part; a chain connecting portion connected to a lower portion of the turnbuckle; and a second horizontal fastening unit connected to the wale while being connected to the chain connecting unit. 9. The method of claim 8,
A construction method of a trench-type two-row sheet pile retaining wall, characterized in that the length of the length adjustment connector is adjusted through the turnbuckle part and the chain connection part. A retaining wall using the construction method of the trench-type two-row sheet pile retaining wall according to any one of claims 1 to 9.

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