KR102638704B1 - Continuous steel diaphragm wall technology for underground space wall structure and its construction method - Google Patents

Abstract

STEEL UNDERGROUND CONTINUOUS WALL FOR UNDERGROUND SPACE STRUCTURE WALL AND CONSTRUCTION METHOD THEREOF The present invention relates to a steel underground continuous wall for an underground space structure wall. The steel underground continuous wall for an underground space structure wall comprises: a wall panel which is inserted into an excavation space vertically excavated from the ground along an area where an underground continuous wall is to be constructed, and in which a plurality of square pipe modules composed of square pipes and flanges to which the square pipes are attached are alternately and reversely arranged, wherein the square pipe modules are coupled by surface contact while accommodating square pipe corner portions and flanges; and a first filler filled in the excavation space. The square pipe modules include two square pipes arranged side by side and two flanges coupled to one surface and the other surface of the two square pipes in a longitudinal direction, respectively, wherein the two square pipes are in close contact with each other or are spaced apart from each other.

Description

Continuous steel diaphragm wall technology for underground space wall structure and its construction method}

The present invention has excellent constructability by using a modularized steel wall panel as a core, and the lateral bonding of the wall is strengthened through a simple interlocking structure of a plurality of members constituting the wall panel, resulting in high bending rigidity, and the interconnected members are earthquake resistant. It relates to a continuous steel underground wall and its construction method that can have sufficient stability as a permanent wall structure in an underground space by dispersing load energy and providing higher earthquake resistance performance.

In general, an underground continuous wall blocks the inflow of groundwater, excavates the ground to a predetermined depth with a designed width and width using a bucket or trench cutter designed for soil excavation, and then supplies a stabilizing fluid in proportion to the amount of excavated soil to cause the excavation surface to collapse. It is constructed by inserting a reinforcing bar network inside the excavation surface and repeating the process of pouring concrete to form a continuous reinforced concrete wall in the ground.

Previously, Republic of Korea Patent No. 10-1216716 proposes a construction method for an underground continuous wall.

According to the prior art mentioned above, forming a shallow trench by excavating the ground at a location where the underground continuous wall is planned to be constructed to a certain width and depth, installing molds at regular intervals on both sides of the shallow trench, and forming the mold. forming a guide wall by placing reinforcing bars and simultaneously pouring and curing concrete; forming a deep trench by excavating downward to a certain depth on the inside of the guide wall; and forming a grid shape at the top of the shallow trench. Installing a guide frame, assembling steel piles made of a plurality of H beams, inserting steel piles into a deep trench within the guide frame, and inserting a tremie pipe into a shallow trench into which the steel piles are inserted. A technology for constructing an underground continuous wall has been disclosed by sequentially performing the steps of inserting and pouring and curing low-strength concrete in a deep trench using the tremie pipe.

In a typical underground continuous wall, the joint between wall panels installed continuously in the ground creates a connection surface in a geometrically irregular shape, such as a triangle or square, to compensate for the vulnerability of the rigidity of the joint.

However, in the case of the underground continuous wall according to the above prior art, it is intended only to function as a temporary earth wall, that is, an earth wall that temporarily supports earth pressure during the short-term construction process of constructing an underground space for constructing a permanent underground building, and between wall panels. Alternatively, the connection between underground thumb piles has a weak bonding structure and is vulnerable to shearing due to earth pressure and seismic load.

Therefore, it is necessary to secure sufficient support performance for bending and shear behavior at the wall panel or thumb pile connection against earth pressure, water pressure, or seismic load acting from the back of the wall to the front in the underground space being created, as well as to have underground groundwater blocking performance. There are difficulties in meeting the wall design performance of underground structures.

Republic of Korea Patent No. 10-1216716

Therefore, the purpose of the present invention is to provide an underground space structure wall that can be used as a permanent structure wall in an underground space by having a structure that can secure sufficient earth pressure bearing capacity and ensure sufficient stability even after load changes such as earthquakes after construction. To provide a steel underground continuous wall and its construction method.

As a means to solve the above-described problem, the steel underground continuous wall for the underground space structure wall of the present invention (hereinafter referred to as the “underground continuous wall of the present invention”) is vertical from the ground along the area where the underground continuous wall is to be constructed. A plurality of square pipe modules consisting of square pipes and flanges to which the square pipes are attached are arranged alternately, and each square pipe module is a wall in which the right leg of the square pipe and the flange are mutually accommodated and bound by surface contact. panel; and a first filler filled in the excavation space, wherein the square pipe module is composed of two square pipes arranged side by side and two flanges coupled to one side and the other side of the two square pipes along the longitudinal direction, respectively, The two square pipes are characterized in that they are in close contact with or spaced apart from each other.

As an example, a second filler filled inside the square pipe module of the wall panel is further included.

As an example, the square pipe module is coupled to one side of the square pipe and the flange by installing a bolt, and the bolt protrudes inside or outside the flange.

As an example, the square pipe module is characterized in that the cross section of the square pipe is formed from a circular steel pipe.

As an example, the square pipe module is configured to space two square pipes apart from each other and further includes a guide pipe that is vertically coupled between the two square pipes to guide the vertical insertion of the pile.

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Meanwhile, the construction method of a steel underground continuous wall for an underground space facility wall of the present invention (hereinafter referred to as the "construction method of the present invention") is: a) a vertical direction from the ground to the planned depth along the area where the underground continuous wall is to be constructed; forming a plurality of excavation spaces; b) inserting and placing the wall panel in the selected excavation space; Filling the excavation space with a first filler; d) constructing an underground continuous wall by sequentially performing steps a) to c) for other adjacent excavation spaces.

As an example, step c) further includes filling the inside of the plurality of square pipes with a second filler, which is a concrete or reinforced concrete mixture.

As an example, in step b), in the selected excavation space, two square pipes are configured to be spaced apart from each other in the wall panel and further include a guide pipe that is vertically coupled between the two square pipes to guide the vertical insertion of the pile. The method further includes excavating additional holes vertically through the guide pipe so that the module is included, and then inserting a pile containing a steel beam or a reinforcing bar network into the excavated hole.

In this way, the underground continuous wall of the present invention and its construction method not only have excellent constructability by using factory-made modularized steel wall panels as a deep part, compared to existing underground continuous walls that require a lot of time to place reinforcing bars, but also improve construction efficiency. It has the effect of shortening the time and achieving excellent economic efficiency.

In addition, as the plurality of square pipe modules that make up the wall panel are alternately arranged in reverse order and the members are connected in an interlocking structure, high bending strength is developed, which not only ensures excellent earth pressure bearing capacity, but also allows interlocking at the boundaries between square pipe modules. This has the effect of effectively resisting rotational deformation as well as internal deformation of the walls of underground spaces.

In addition, the wall panel remains stably assembled without the use of separate binding means due to the earth pressure acting at both ends and the interlocking between the square pipe modules that make up the wall panel, and the partially formed members disperse the seismic load energy, resulting in higher earthquake resistance. By having the performance, it has the effect of having sufficient stability as a permanent wall structure in underground space.

1 is a diagram showing the configuration of an underground continuous wall of the present invention.
2A to 2D are schematic diagrams showing examples of interlocking according to cross-sectional shape.
Figure 3 is a diagram showing the earth pressure acting on the underground continuous wall of the present invention.
Figure 4 is a plan view showing the interlocking effect of wall panels.
Figure 5 is a plan view showing the connection structure of a square pipe and a flange according to an embodiment of the present invention.
Figure 6 is a view showing a square pipe being formed from a circular steel pipe according to an embodiment of the present invention.
Figure 7 is a diagram showing a square pipe module composed of two square pipes according to another embodiment of the present invention.
Figures 8a and 8b are diagrams showing a structure in which two square pipes are spaced apart in a square pipe module according to another embodiment of the present invention.
Figure 9 is a diagram showing a guide pipe according to another embodiment of the present invention.
10 and 11 are diagrams showing a square pipe module according to another embodiment of the present invention.

In describing the present invention, the terms and words used in the specification and claims are based on the principle that the inventor can appropriately define the concept of the term in order to explain the invention in the best way. It must be interpreted with meaning and concepts consistent with the technical ideas of.

As shown in Figure 1, the underground continuous wall of the present invention is inserted into the excavation space (1) excavated in the vertical direction from the ground along the area where the underground continuous wall is to be constructed, and the square pipe 110 and the square pipe 110 are attached. A plurality of square pipe modules (100) composed of flanges (120) are alternately arranged in reverse, and each square pipe module (100) is a wall panel in which the right angle portion of the square pipe (110) and the flange (120) accommodate each other and are bonded by surface contact. (10); And a first filler (20) filled in the excavation space (1).

In structures such as walls and slab facilities, changes are generally made to the known geometry or topology in the shape of the members themselves, such as wood or stone, or in the connections between the constituent wall members, and a plurality of adjacent members are combined into two. By introducing various connection methods by combining them in one or three dimensions, masonry walls, road pavements, domes or arch structures can be constructed, or geometric topological interlocking structures may be used.

Figure 2a is an example of a method used for the connection between panels in the underground continuous wall method for underground space development, and the horizontal linear displacement constraint load inside the wall due to the lateral earth pressure acting on the created space during ground excavation. During this action, the wall extension in the linear direction is relatively large, resulting in a plain strain condition similar to that of a retaining wall structure, and the connection surface shows an example of a topological interlocking bonding structure with a two-dimensional concave-convex geometric configuration.

However, in the example of Figure 2a, the horizontal shear resistance performance against earth pressure, water pressure, or dynamic seismic load is relatively small, and there is also a problem with the cross-sectional performance supporting the horizontal linear bending rigidity of the wall at the panel joint.

Therefore, horizontal shear and bending rigidity can be strengthened by improving the geometry and topology with multiple flange-type connections on the front and back as shown in Figure 2b, and a 'Z shape' is formed by configuring a triangular geometry with multiple flanges and acute angles as shown in Figure 2c. ' By applying a more robust topological interlocking with a concavo-convex combination structure, stronger shear and bending rigidity can be achieved along with joint assembly between wall members.

In addition, as shown in Figure 2d, it is used as a binding surface of steel or square pipe and is used as an interlocking binding device for vertical beam members. This topological interlocking provides mutual kinematic self-fixation (self-fixation) between adjacent material elements through a two-dimensional combination of surface contact and restraint while the right corners and flanges of each pipe accommodate each other between multiple panels, beams, or square pipe module members. -locking) It induces a binding operation and has cross-sectional rigidity against bending or shear as a construction member that is formed within a structure even without adhesive materials such as cement or auxiliary connecting devices.

Based on this point, the wall panel 10 of the present invention is formed by assembling a plurality of square pipe modules 100, wherein the square pipe module 100 includes a square pipe 110 and a flange 120 to which the square pipe 110 is attached. ) is composed of. The material of the square pipe 100 and the flange 120 is not limited, and for example, steel may be used.

As shown in FIG. 3, the wall panel 10 constructed in this way receives earth pressure from the ground and compressive force is applied to both ends of the wall panel 10. This compressive force makes it possible to couple the square pipe modules 100 without a separate restraining means. It will happen.

In addition, as shown in FIG. 4, the wall panel 10 is able to effectively resist not only rotational deformation but also internal deformation of the underground space wall by interlocking at the boundary between each pipe 110.

This wall panel 10 is a structure of an underground continuous wall and resists back earth pressure. In particular, in the case of a square pipe module 100 including a square pipe 110, when an external force such as earth pressure is applied, the adjacent square pipe module 100 Interlocking, or in other words, binding effect due to mutual engagement, occurs between the two.

Accordingly, the wall panel 10 exhibits high bending rigidity, remains stably assembled without a separate fastening means, and the partially formed members disperse the seismic load energy, enabling higher seismic performance.

The excavation space 1 is an underground space excavated using known excavation equipment such as a trench cutter, and may have a certain width and depth. At this time, the excavation space 1 is excavated to have a width relatively larger than the width of the wall panel 10, so that a filling space for the first filler 20, which will be described below, can be secured.

The first filler 20 is filled in the excavated space 1, including the outside of the wall panel 10 or, although not shown in the drawing, the inside of the wall panel 10.

For example, the first filler 20 may be soil-cement. This first filler 20 forms the main surface of the underground continuous wall and functions as a water barrier together with the wall panel 10. Since various known materials may be applied to the soil-cement, detailed description thereof will be omitted.

In addition, as shown in Figure 1, each square pipe 110 or square pipe module 100 of the square pipe module 100 can be filled with a second filler 30, where the second filler 30 is the first filler. (20) More rigid concrete or reinforced concrete can be applied to further double the strength of the wall.

That is, the second filler 30 is filled and cured inside each square pipe 110 or square pipe module 100 constituting the wall panel 10 and is synthesized with the wall panel 10, forming the structure of an underground continuous wall. Jane's errand is formed.

In the square pipe module 100, the shape of the square pipe 110 is not limited to triangle, square, trapezoid, etc., but a triangular cross-section is assumed in the drawing.

In the square pipe module 100, square pipes 110 of this shape are attached to a plate-shaped flange 120, and as shown in the drawing, the wall panel 10 has a plurality of square pipe modules 100 alternately along the arrangement direction. It is placed in reverse.

Constructed in this way, the flange 120 of each square pipe module 100 forms an outer wall in the wall panel 10, and the square pipes 110 of each square pipe module 100 engage with each other to operate the interlocking operation mentioned above. This is to enable the mechanism to manifest.

As an example, the square pipe module 100 may be coupled by fastening bolts between one side of the square pipe 110 and the flange 120, as shown in FIG. 5, and in the case of the bolt 130, the excavation space (1) ) and is configured to be exposed to the inside of the square pipe 110, so that the bolt 130 is used as a coupling means between the square pipe 110 and the flange 120, and as a shear connector, the product to be filled and cured in the future. Together with the first filler 20 and the second filler 30, or a concrete inner wall structure that can be constructed in contact with the underground space facility, a stable and effective composite structure can be created.

In addition, the square pipe 110 may be formed into a cross-sectional shape from a commercially available round steel pipe product, including a method of forming a steel plate by bending and then welding or bolting.

For example, the square pipe 110 can be formed from a circular steel pipe into a square pipe using a molding machine such as a roll forming machine. During the forming process, the cross-sectional shape and height of the square pipe as well as the inclination and shape of the right corner are adjusted. By being able to adjust it in various ways, it is possible to obtain the required bending resistance, tension, and compression resistance cross-sectional performance by manufacturing it to member specifications suitable for site and design conditions.

Referring to FIG. 6, a square pipe 110 having a trapezoidal cross-sectional shape can be formed by roll forming a circular steel pipe. When the square pipe 110 is formed so that a curved surface is formed at the right angle, a difference in the length of the main surface of the square pipe occurs. Only the width of each pipe can be increased at an arbitrarily set height.

Meanwhile, the square pipe module 100 according to an embodiment of the present invention includes a plurality of square pipes 110 arranged side by side, and a plurality of flanges 120 each coupled to one side and the other side of the plurality of square pipes 110 along the longitudinal direction. ) can be composed of.

The square pipe module 100 is configured so that one side of the flange 120 is in contact with one side of the square pipe 100, and the arranged square pipe 110 and the flange 120 are connected through welding or bolting operations.

The square pipe module 100 of this embodiment can be applied as a selected one of the plurality of square pipe modules 100 constituting the wall panel 10 and used as a spacer that can adjust the overall length of the wall panel 10.

At this time, the two square pipes 110 may have a structure in which they are in close contact with each other as shown in FIG. 7.

In addition, a certain distance may be formed between the two square pipes 110, where the two square pipes 110 are reversed and arranged in opposite directions as shown in FIG. 8A, or as shown in FIG. 8B. Likewise, the two square pipes 110 may be arranged in the same direction.

In addition, the square pipe module 100 is configured so that the two square pipes 110 are spaced apart from each other, as shown in FIG. 9, and the space between the two spaced apart square pipes 110 is provided with a guide pipe coupled in the vertical direction ( 160) may be further provided.

The guide pipe 160 is in the form of a normal pipe with a hollow 161, and when additional pile construction is required in the ground below the square pipe module 100, which is installed as necessary when constructing an underground continuous wall, In the preliminary work process for pile insertion, the vertical direction of the drilling equipment is used as a guide casing to secure the drilling verticality for the drilling hole for pile insertion. In addition, the guide pipe 160 along with the square pipe 110 is formed within the wall panel 10 and functions as an attached beam member that contributes to the rigidity of the underground wall against earth pressure and water pressure.

Additionally, another example of the square tube module 100 in the present invention is shown in FIGS. 10 and 11.

The square pipe module 100 of this embodiment is fastened so that the square pipe 110 attached to one side of the flange 120 and the square pipe 110 of the other square pipe module 100 are attached to the other side of the flange 100. It is characterized in that it includes a stage (170).

As shown in the drawing, the fastening end 170 is composed of an attachment end 172 attached to the end of the flange 100 and an inclined end 171 having an upward slope from one end of the attachment end 172. It is composed.

It is preferable that the slope of the inclined end 171 is configured to be the same as the angle formed by the corner of the square pipe 110, which means that another square pipe module is formed between the inclined end 171 and the flange 120, as shown in FIG. 11. This is to ensure that the corner portion of the square pipe 110 of (100) is inserted.

In addition, the end of the attachment end 172 extends longer than the end of the flange 120 at the fastening end 170 to form an insertion jaw 180 of the flange 120 of the other square pipe module 100. As shown in FIG. 11, when connecting adjacent rectangular pipe modules 100, the outermost rectangular pipe module 100-1 is positioned in the middle of the insertion ledge 180 of the outermost rectangular pipe module 100-3 in the other direction. It is fixed by the fastening end 170 of the module 100-2, making it possible to control opening, twisting, etc. that may occur when assembling the square pipe module 100. In other words, it allows for easier and more robust assembly.

More preferably, a separation prevention means is further formed at the end of the flange 120 formed of the insertion jaw 180 so that the flange 120 of the other square pipe module 100 inserted into the insertion jaw 180 is firmly fixed. It is reasonable to do so as much as possible.

Meanwhile, the construction method of the present invention includes the steps of a) forming a plurality of excavation spaces (1) in the vertical direction from the ground to the planned depth along the area where the underground continuous wall is to be constructed, and b) forming the above-described excavation spaces (1) in the selected excavation space (1). Steps of inserting and arranging the wall panel 10, c) filling the excavation space 1 with the first filler 20 while the wall panel 10 is being inserted and arranging, and d) filling the excavation space 1 with the first filler 20, and d) inserting the wall panel 10 into the other adjacent excavation spaces 1. It includes the step of constructing an underground continuous wall by sequentially performing steps a) to c) above.

In addition, in step c), a step of filling the inside of the plurality of square pipes 110 with a second filler 30, which is a concrete or reinforced concrete mixture, is further included.

At this time, additional pile insertion may be required in the ground below the wall panel (10) installed in the excavation space (1) selected in step b).

In this case, the wall panel 10 has two square pipes 110 spaced apart from each other as shown in FIG. 9, and a square pipe module in which a guide pipe 160 is coupled in the vertical direction between the two square pipes 110. (100) can be placed at a selected location, that is, a location where file insertion is required.

In addition, the drilling equipment allows additional drilling excavation to be performed vertically through the guide pipe 160 to ensure excavation verticality, and includes a steel beam or reinforcing bar network for inserting piles into the drilling hole formed by excavation. By performing the step of inserting a pile into the excavated lower perforation, an underground pile can be inserted to secure the stability of a safer underground wall facility.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims are also possible. falls within the scope of rights.

10: Wall panel 20: First filler
30: Second filler
100: square pipe module 110: square pipe
120: Flange 130: Bolt
160: Guide pipe 170: Fastening end
171: inclined end 172: attached end
180: insertion jaw

Claims (11)

It is inserted into an excavation space excavated in a vertical direction from the ground along the area where the underground continuous wall is to be constructed, and a plurality of square pipe modules consisting of square pipes and flanges to which the square pipes are attached are arranged alternately and inverted, and each square pipe module has a right corner of the square pipe and Wall panels that are joined by face contact while the flanges accommodate each other; and
It includes a first filler filled in the excavation space,
The each pipe module is,
For an underground space structure wall consisting of two square pipes arranged side by side and two flanges coupled to one side and the other side of the two square pipes along the longitudinal direction, wherein the two square pipes are in close contact with or spaced apart from each other. Steel underground continuous wall.
According to clause 1,
A steel underground continuous wall for an underground space structure wall, characterized in that it further includes a second filler filled inside the square pipe module of the wall panel.
According to clause 1,
The each pipe module is,
A steel underground continuous wall for an underground space structure wall, characterized in that one side of the square pipe and the flange are connected by installing a simple bolt, and the bolt protrudes inside or outside the flange.
According to clause 1,
The each pipe module is,
A steel underground continuous wall for an underground space structure wall, characterized in that the cross section of each pipe is formed from a circular steel pipe.
delete According to clause 1,
The each pipe module is,
A steel underground continuous wall for an underground space structure wall, characterized in that the two square pipes are configured to be spaced apart from each other and further include a guide pipe that is vertically coupled between the two square pipes to guide the vertical insertion of the pile.
delete delete a) forming a plurality of excavation spaces in the vertical direction from the ground to the planned depth along the area where the underground continuous wall is to be constructed;
b) inserting and arranging the wall panel of any one of items 1 to 4 and 6 into the selected excavation space;
c) filling the excavation space with a first filler; and
d) constructing an underground continuous wall by sequentially performing steps a) to c) for other adjacent excavation spaces; a method of constructing a steel continuous underground wall for an underground space structure wall, comprising:
According to clause 9,
A method of constructing a steel underground continuous wall for an underground space structure wall, characterized in that step c) further includes the step of filling the inside of the plurality of square pipes with a second filler material, which is a concrete or reinforced concrete mixture.
According to clause 9,
In step b), in the selected excavation space,
The wall panel is configured to space two square pipes apart from each other and includes a square pipe module that is vertically coupled between the two square pipes and further includes a guide pipe to guide the vertical insertion of the pile, so that it is added vertically through the guide pipe. A method of constructing a steel underground continuous wall for an underground space structure wall, characterized in that it further includes the step of inserting a pile containing a steel beam or a reinforcing bar network into the excavated hole after excavating the hole.

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