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KR-20260062284-A - Underground structures and construction methods using double pipes and expandable sheet piles

KR20260062284AKR 20260062284 AKR20260062284 AKR 20260062284AKR-20260062284-A

Abstract

The present invention relates to an underground structure and a method of constructing the same using a double pipe and an expandable sheet pile, wherein, during the construction of an underground structure for securing underground walls or underground spaces, a variable member can be actively varied according to the irregular construction spacing between steel pipes, and at the same time, structural strength reinforcement and waterproofing functions are enhanced by using grout and a water-expanding agent. More specifically, the structure comprises a central steel pipe installed behind the expansion bit and pressed in to surround an expansion bit for excavating a bore hole in the ground and a screw for excavation and soil removal, a structural steel pipe with a fastening portion formed on its outer surface, and a variable member connecting the structural steel pipes; thereby, when constructing an underground wall in the form of a waterproof wall or a structural wall or an underground structure in the form of a tunnel within the ground using a casing-shaped steel pipe, the steel pipes are connected to each other using the variable member, thereby providing the effect of having waterproofing and connecting functions.

Inventors

  • 이상목

Assignees

  • 이상목

Dates

Publication Date
20260507
Application Date
20241029

Claims (12)

  1. In a structure constructed for an underground space in the form of a watertight wall or a tunnel by installing steel pipes in a vertical or horizontal direction, A central steel pipe (10) that is connected to the rear of an expansion bit (2) for constructing a drill hole (1) in the ground, surrounds a screw (3) for drilling and removing soil, and is pressed into the drill hole (1) at the same time as drilling. A structural steel pipe (30) that is connected to surround the central steel pipe (10) at the rear of the expansion bit (2), is installed by pressing it into the interior of the drilling hole (1) together with the central steel pipe (10) at the same time as drilling, and has a plurality of fastening parts (20) formed along the length direction on its outer surface. Variable member (40) formed as a set of two, which is fastened to the above-mentioned fastening part (20) and press-fitted to be connected in a variable corresponding manner according to the installation spacing of the structural steel pipe (30) and the structural steel pipe (30). An underground structure using a double pipe and an expandable sheet pile, characterized in that the above variable member (40) is configured to include a function of connecting structural steel pipes (30) and a function of sealing the space between them.
  2. In claim 1, a plurality of connecting members (31) supported on the outer surface of the central steel pipe (10) are formed to be connected in a circular arrangement on the inner surface of the structural steel pipe (30), or The above central steel pipe (10) or structural steel pipe (30) may be formed in a square or rectangular shape, or The above structural steel pipe (30) is formed by being connected to the rear of the expansion bit (2) alone, or An underground structure using a double pipe and an expandable sheet pile, characterized in that the above-mentioned fastening portion (20) is formed on the outer surface along the longitudinal direction of the structural steel pipe (30) and is configured in the form of a fastening projection (21) or a fastening groove (22).
  3. In claim 1, the variable member (40) is formed as a pair, and at each end, a connecting end (41) connected to the fastening part (20) is formed in a ring shape or a circular shape. A ring-shaped hook portion (43) is formed at each end of the variable body (42) that extends integrally with the above-mentioned connecting portion (41), An underground structure using a double pipe and an expandable sheet pile, characterized in that the hooking spacing of the hook portion (43) is configured to be adjusted according to the installation spacing between the structural pipes (30).
  4. In claim 3, the end of the hook portion (43) of the variable member (40) is in the form of a hollow tube, and a barrier portion (45) is formed in which a plurality of discharge holes (44) are formed along the longitudinal direction, or At the end of the hook portion (43) of the variable member (40), a hook portion (46) is formed along the length direction so as to be caught on each other. An underground structure using a double pipe and an expandable sheet pile, characterized by being composed of a pair of variable members (40) having the above-mentioned cutoff member (45) formed therein, a variable member (40) having the above-mentioned cutoff member (45) formed therein and a variable member (40) having the above-mentioned cutoff member (45) formed therein and a variable member (40) having the above-mentioned cutoff member (46) formed therein, or a pair of variable members (40) having the above-mentioned cutoff member (46) formed therein.
  5. An underground structure using a double pipe and an expandable sheet pile, characterized in that, in claim 4, grout (G) or a water-expanding agent (W) is inserted into the cutoff portion (45) and the hook portion (46) of the hook portion (43).
  6. An underground structure using a steel pipe, characterized in that, in claim 4, a grout (G) or a water-expanding agent (W) is inserted into the hook space (47) formed between the sealing member (45) and the sealing member (45), between the sealing member (45) and the hook member (46), and between the hook member (46) and the hook member (46) of the above-mentioned hook portion (43).
  7. In claim 1, the variable member (40) may have a connecting body (48) formed integrally with a connecting end (41) formed at both ends, or An underground structure using a double pipe and an expandable sheet pile, characterized in that the above variable member (40) is configured such that a connecting body (48) extending integrally with a connecting end (41) formed at both ends, and a hollow space (49) is formed in the center of the connecting end (41) and the connecting body (48), so that grout (G) or a water-expanding agent (W) is filled inside the hollow space (49).
  8. An underground structure using a double pipe and an expandable sheet pile, characterized in that, in the first paragraph, the variable member (40) is connected to the fastening part (20) of the structural steel pipe (30) and the front end that is pressed into the ground is formed with an inclined end (42a) so as to be pointed.
  9. In claim 1, the central steel pipe (10) has a flow hole (11) formed along the longitudinal direction, and An underground structure using a double pipe and an expandable sheet pile, characterized in that grout is injected between the central pipe (10) and the structural pipe (30).
  10. In a construction method for a structure constructed for an underground space in the form of a watertight wall or a tunnel by installing steel pipes in a vertical or horizontal direction, A structural steel pipe (30) is installed by being fitted into a central steel pipe (10) that is installed to surround a screw (3) connected to the rear of an expansion bit (2) for constructing a bore hole (1) in the ground, and The central steel pipe (10) and the structural steel pipe (30) are simultaneously driven into the interior of the drilled hole (1) constructed in the ground by the expansion bit (2) and the screw (3) through the rotation and driving operation of the vertical or horizontal driving equipment. The above structural steel pipe (30) is positioned between the structural steel pipe (30) and the structural steel pipe (30), and is simultaneously pressed into the ground with the fastening part (20) and the variable member (40) connected. Grout (G) is injected into the internal space of the central steel pipe (10) and the space between the central steel pipe (10) and the structural steel pipe (30). Grout (G) is injected or a water-expanding agent (W) is filled into the fastening part (20) and variable member (40) of the above structural steel pipe (30), and A method for constructing an underground structure using a double pipe and an expandable sheet pile, characterized by constructing a finishing material on the inner side of a tunnel-shaped structure for securing a watertight wall or underground space.
  11. In item 10, the variable member (40) is formed as a pair, and at each end, a connecting end (41) connected to the fastening part (20) is formed in a ring shape or a circular shape. A ring-shaped hook portion (43) is formed at each end of the variable body (42) that extends integrally with the above-mentioned connecting portion (41), and The end of the above hook portion (43) is in the form of a hollow tube, and a barrier portion (45) is formed in which a plurality of discharge holes (44) are formed along the length direction, or At the end of the hook portion (43) of the variable member (40), a hook portion (46) is formed along the length direction so as to be caught on each other. When the above variable member (40) is driven into the ground, the hooking spacing of the hook portion (43) is adjusted according to the ground driving spacing between the structural steel pipe (30) and the structural steel pipe (30). A method for constructing an underground structure using a double pipe and an expandable sheet pile, characterized in that grout (G) or a water-expanding agent (W) is inserted into the hook space (47) formed between the hook section (43) and the hook section (46), the hook section (45) and the hook section (46), and the hook section (46) and the hook section (46).
  12. In claim 10 or 11, the variable member (40) may have a connecting body (48) formed integrally with a connecting end (41) formed at both ends, or A method for constructing an underground structure using a double pipe and an expandable sheet pile, characterized in that the above variable member (40) is configured such that a connecting body (48) extending integrally with a connecting end (41) formed at both ends, and a hollow space (49) is formed in the center of the connecting end (41) and the connecting body (48), so that a grout (G) or a water-expanding agent (W) is filled inside the hollow space (49).

Description

Underground structures and construction methods using double pipes and expandable sheet piles The present invention relates to a structure and construction method using steel pipes, and more specifically, to an underground structure and construction method using double pipes and expandable sheet piles that can be applied to underground civil engineering, underground structure construction, and underground road and facility construction industries by utilizing steel pipes to form underground walls or underground structures for securing underground spaces, while simultaneously using variable members to perform waterproofing and connection functions. Generally, for underground earth retaining wall construction methods or tunnel-shaped underground structures, H-piles using prefabricated steel or CIP (Cast-in-Place) earth retaining walls in which concrete is poured after drilling on-site have been mainly used, and for both methods, a grouting auxiliary method is added to the back to cut off water, and this is still the most widely applied method. At this time, the H-pile wall method is the most widely used earth retaining method in underground excavation work. It involves inserting H-piles after drilling and then fitting wooden retaining boards or concrete retaining walls between the H-piles as excavation progresses. However, because this H-pile wall method has low rigidity and experiences significant displacement, its application is limited in soft ground or areas adjacent to buildings. Furthermore, since it is vulnerable to water cutoff, backfill grouting must be performed in sections below the groundwater level, which leads to problems such as localized ground contamination. Furthermore, the CIP earth retaining wall construction method involves forming an earth retaining wall by connecting circular columns that have been cured after drilling, inserting H-piles or rebar mesh, and pouring concrete. The CIP method suffers from reduced constructability due to extensive on-site work, such as rebar mesh assembly and excessive concrete pouring. Additionally, the frequent formation of poor piles caused by groundwater and soil mixing during concrete pouring makes it difficult to ensure structural reliability, and the current situation involves frequent leakage and site cleanup work. Moreover, issues such as ground contamination resulting from backfill waterproofing grouting are also emerging as problems. Various improved construction methods have been developed and are being applied to overcome the shortcomings of existing H-pile or CIP retaining wall systems and to enhance economic efficiency. These improved methods mainly consist of cast-in-place concrete retaining wall series that are modifications of the CIP wall system, and methods utilizing precast concrete piles as retaining walls. Types of these methods include the CIII method, UNI Wall method, PHC W method, e-PHC wall pile method, e-cone pile PHC retaining wall method, and Hi-PHC method. In particular, the continuous underground wall is constructed by continuously connecting the outermost vertical walls of a building's basement, thereby securing underground space within. Since this continuous underground wall cannot be constructed all at once, it is inevitably built by sequentially pouring and curing unit concrete panels so that their boundaries are integrally connected. Although joints with an interlocking shape are formed at the connection points of each concrete panel to allow for interlocking, cases may occur where the joints are not tightly connected due to the staggered curing of the connecting panels. Furthermore, the connection points of each panel—specifically the joints—gradually weaken over time due to various types of soil, bentonite solution used as a soil stabilizer during excavation, and various byproducts. This leads to a compromise in the safety of the retaining wall. Consequently, since these connections are not watertight, there is a problem of concentrated leakage. Specifically, one method for constructing a continuous underground wall is the slurry wall construction method. This method involves constructing a continuous underground wall by inserting a reinforcing mesh into an excavated underground space and then pouring concrete to form plate-shaped first and second concrete panels, which are then closely connected sequentially in a linear fashion. When the first concrete panels are cured at regular intervals underground and a space is excavated with an excavator to form the second concrete panels between them, a pair of augers rotate to process each end of the first concrete panels into an uneven shape to form joints. Due to the impact during this process, the strength of the joints between the first concrete panels may be weakened, or in severe cases, cracks may occur. Subsequently, when a reinforcing mesh is inserted into the excavated space between each first concrete panel and concrete is poured to form the second concrete panels, th