KR101952669B1 - Temporary facility circular retaining wall method using arched steel plate and guide structure - Google Patents

Abstract

The present invention provides a circular temporary retaining wall construction method which uses an arch-shaped steel plate and a guide structure to increase geometric stability of a retaining wall structure by a circular shape and allow optimal excavation, supports and distributes soil pressure in axial force in a circumferential direction to allow construction by small member stiffness unlike conventional support materials, allows variable section construction by changing excavation sections and bump construction by excavation depths, allows arch-shaped structure formation with excellent stability by ring strut installation if installation of earth anchors and internal bearing struts is difficult, and maximizes space utilization. According to a proper embodiment of the present invention, a circular temporary retaining wall construction method using an arch-shaped steel plate and a guide structure comprises: a step of forming boring holes arranged in a circular shape at regular intervals on planned ground of a retaining wall excavation target; a step of inserting and installing guide structures in the boring holes in a one-to-one manner, and inserting and installing arch-shaped steel plates having a prescribed radius of curvature by being guided by the guide structures to sequentially support soil pressure between neighboring guide structures on a circular shape to distribute axial force in a circumferential direction; a step of firstly excavating the inside of multiple arch-shaped steel plates arranged in a circular shape; and a step of installing a ring support on at least one position of an inner surface of guide structures arranged in a circular shape after the first excavation and then excavating the remainder to secure stability of retaining wall excavation.

Description

Technical Field [0001] The present invention relates to a circular retaining wall method using an arch steel plate and a guide structure,

The present invention relates to a retention method for installing a manhole, a circular pier, and a circular wedge, and more particularly, to a retention method using an arch type steel plate and a guide structure to secure the geometric stability of the retaining structure and optimally excavate the material cost and the construction cost This is an earth retaining method in which the economical efficiency due to the reduction is improved. As a result, the earth pressure is uniformly distributed by the circular closing structure, and the structural resistance is increased by increasing the axial member resistance stiffness of the ring- It is possible to construct an arch type earthquake structure with excellent stability by installing ring strut when it is difficult to install earth anchor and internal strut strut according to surrounding conditions and construction conditions, Space Utilization, Structural Stability, A porous and improve the economics circular gasiseol relates to a retaining method.

Conventional retaining method is H-BEAM + soil board, straight steel sheet, sheet file (SHEET PILE). Such a retaining construction method is difficult to excavate in a circular shape because the shape of the installation structure is not considered and a uniform rectangular shape is installed. In addition, when the circular structure such as the vertical ventilating tower, the sewage pipe, and the circular pier is installed, the construction cost and the compensation cost are increased due to the increase of the excavation range. In addition, due to the nature of the reinforcement of the support, the quality and the workability are deteriorated due to the narrow and interference of the internal work space. In addition, it has a disadvantage in that it has a poor ability to cope with the eccentric earth pressure in accordance with the change in the left and right excavation, and is vulnerable to the stability due to the occurrence of concentrated stress in the right angled portion due to the asymmetric structure.

In addition, in the conventional retaining method, since the support material acts as a flexural member, the material cost is increased by requiring a large member rigidity. In addition, there is no known method of stepwise construction according to the section change of the circular structure and stepwise construction according to the excavation ground condition.

As a background of the present invention, Korean Patent Registration No. 10-1647340, a 'method of constructing a circular retaining structure' has been proposed. The method includes the steps of placing a plurality of blocks in a circular shape through a grounded outer surface, coupling the upper portion of the L-shaped bracket along the inner circumferential surface of the plurality of circularly arranged blocks, And connecting the plurality of connecting blocks in the circumferential direction to form a circular block assembly, and further adding a trough to a set depth below the circular block assembly, And further forming a circular block assembly through the detached region. In this background art, it is difficult to shorten the construction period because a plurality of blocks must be coupled to the L-shaped bracket and the circular block assembly is secondarily assembled in the circumferential direction and the excavation direction.

As another background art of the present invention, Korean Registered Utility Model Registration No. 20-0249171, 'Prefabricated circular concrete earth retaining structure of foundation of foundation structure' has been proposed. This is a method of constructing a circular concrete earthen frame by assembling the concrete earthen frame and steel band with assembly bolts. This background technology requires a factory to manufacture a concrete pavement frame, and it takes a lot of time to assemble a large number of concrete pavement frames and steel plate bumps at each excavation step, and there is a limit to shorten the air accordingly.

Korean Patent Registration No. 10-1647340 Korean Registered Utility Model Registration No. 20-0249171

The present invention relates to a circular piling method in which the arch type steel plate and the guide structure are used to improve the economical efficiency by reducing the material cost and the construction cost by securing the geometric stability of the retaining structure and optimally excavating the circular piling structure, The structural rigidity of the axial support member of the ring support is increased and the stability of the axial member is increased and the excavation depth step can be applied to the cross section construction and the ground condition change according to the change of the excavation section, Provided with a circular stiffening cladding method which can form an arch type cladding structure with excellent stability by installing ring strut when anchor and internal strut strut are difficult to install, and improved space utilization, structural stability, workability and economical efficiency of existing cladding cladding method It has its purpose.

According to another aspect of the present invention, there is provided a method of constructing a circular hypothetical earth retaining structure using an arc-shaped steel plate and a guide structure, the method comprising the steps of: forming a perforation hole circularly arranged at predetermined intervals on a planned ground; The guide structure is guided in a one-to-one correspondence with the perforation hole. In order to distribute the axial force in the circumferential direction by supporting the earth pressure between the guide structures adjacent to the circular shape successively, the arcuate steel plate having a constant radius of curvature is guided Accept and install steps; A step of first drilling the inside of the plurality of arcuate steel plates arranged in a circle; And a step of installing a ring support on at least one side of the inner surface of the guide structure arranged in a circular shape after the first excavation in order to secure the stability of the earth retaining excavation and then performing the remaining excavation.

Further, the method may further include attaching both ends of the arch-shaped steel sheet to the water-expansive exponent after bonding the water-expansive exponent to the guide structure.

Further, the guide structure includes a vertical beam made of a steel material having an H section by inner and outer flanges and abdomen; A pair of L-shaped steel guides provided opposite to each other in the abdomen of the vertical beam to form a steel plate coupling groove between the inner flange and the outer flange; And a bolt fastening means for fastening a pair of L-shaped steel guides to the abdomen of the vertical beam.

Further, some of the arched steel plates are constructed so as to have different penetration depths due to the step difference.

In addition, all of the arched steel plates are fitted into the steel plate coupling grooves formed between the inner flange of the vertical beam and the pair of L-shaped steel guides, so that the reduction excavation having the minimum radius is constructed.

Also, the arch-shaped steel plates are all fitted into the steel plate coupling grooves formed between the outer flange of the vertical beam and the pair of L-shaped steel guides, so that the enlarged excavation having the maximum radius is applied.

In addition, some of the arcuate steel plates are fitted into the steel plate coupling grooves formed between the inner flange of the vertical beam and the pair of L-shaped steel guides, so that the miniscule excavation of the minimum radius is performed, And the steel plate coupling grooves formed between the outer flange and the pair of L-shaped steel guides are engaged with each other to perform the enlargement and excitation of the maximum radius in parallel.

The circular trapezoidal earth retaining method using the arched steel plate and the guide structure according to the present invention has an advantage of increasing the usability of the upper space by installing various circular manholes in urban areas, excavation of small structures, and minimization of excavation area .

In addition, unlike conventional support, it can be installed with small component rigidity by supporting and distributing earth pressure by axial force in the circumferential direction, and it is advantageous to perform stepwise construction according to the cross section construction and excavation depth according to the change of excavation section .

In addition, stability of arch structure is improved by arch and circular structure type. Economic efficiency of construction is improved by minimizing excavation area, and compensation cost is reduced by minimizing excavation area.

Also, if it is difficult to install earth anchors and internal strut struts according to the constraints in the installation of the temporary installation, it is possible to further secure the stability of the circular structure by installing the ring support, and the working time of the excavation equipment is reduced It is advantageous in that the cost of the temporary construction material is reduced by minimizing the excavation area.

In addition, since the arch type steel plate is joined to the guide structure through the water expansive exponent, the degree of the retaining structure is formed. Therefore, the additional grouting operation for the order of the existing retaining structure is unnecessary.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments of the invention and, together with the description, serve to explain the principles of the invention, Shall not be construed as limiting.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a circular trapezoidal earth retaining structure using an arch type steel plate and a guide structure according to the present invention. FIG.
2 is a plan view of Fig.
3A is an enlarged view of a portion 'K' in FIG.
Figs. 3B and 3C are various examples of different construction conditions of the arched steel sheet according to the present invention. Fig.
4 is a perspective view of a guide structure according to one embodiment of the present invention.
FIGS. 5A to 5F are views showing a construction procedure of a circular hypothetical earth retaining structure using an arc steel plate and a guide structure according to the present invention. FIG.
6A is a state before installation of a ring support applied to this method.
FIG. 6B is a plan view of the circular hypothetical earth retaining structure with the ring support of FIG. 6A installed. FIG.
FIGS. 7A and 7B are plan views of a circular temporary securing cladding structure according to the present invention in various construction states. FIG.
Fig. 8 is a front view of the circular temporary securing cladding structure according to the present invention in another construction. Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in the accompanying drawings, but the present invention is not limited thereto.

As shown in FIGS. 1 to 3, the structure to which the arch type steel sheet and the guide structure of the present invention are applied using the circular trapezoidal earth retaining method is a structure in which the guide structure 20 is penetrated into the perforation hole 101 arranged at regular intervals in the ground 10 An arched steel plate 30 having a predetermined radius of curvature R1 or R2 is provided between the guide structures 20 and 20 so as to support the earth pressure between the adjacent guide structures 20 and 20, And is supported on the inner surface of the guide structure 20 in which the ring supports 50 are circularly arranged on at least one side within the excavation of a predetermined depth. The guide structure 20 will be described later.

Hereinafter, the circular trapezoidal earth retaining method using the arch type steel plate and the guide structure of the present invention will be described in the preferred order of construction.

First, as shown in FIG. 5A, a perforation hole 101 is formed in a planned ground 10 of an earth retaining excavation target in a circle at regular intervals. At this time, the diameter of the perforation hole 101 has a size such that a section of the guide structure 20 to be described later can be accommodated. The perforation hole 101 can be constructed using auger equipment. The depth of the perforation hole 101 may be made slightly smaller than the planned excavation depth in consideration of the ground surface of the guide structure 20. [

A guide structure 20 is then inserted into the perforation hole 101 in a corresponding one-to-one correspondence with a predetermined radius of curvature R1 to support the earth pressure between adjacent guide structures 20 and 20 The arched steel plates 30 are inserted and installed under the guidance of the guide structures 20 and 20.

5B and FIG. 5C, the two guide structures 20 and 20 are sequentially inserted into the perforation holes 101, and then the arched steel plates 30 are inserted into the perforated holes 101 as shown in FIG. Are disposed between the guide structures 20 and 20.

Each time the guide structure 20 is further inserted into the perforation hole 101, an arched steel plate 30 is installed between two neighboring guide structures 20 and 20 as shown in FIGS. 5E and 5F.

Therefore, for example, as shown in FIG. 2, the guide structure 20 and the arched steel plate 30 may be installed in four or more, respectively, depending on the size of the earth retaining excavation area and the characteristics of the ground.

The guide structure 20 includes a vertical beam 22 having an inner and outer flanges 221 and 222 and an H section with an H section by abdomen 223 as shown in Figures 3 and 4 and a vertical beam 22, A pair of L-shaped steel guides 24 and 24 provided so as to face each other on the abdomen portion 223 of the flange 221 to form steel plate coupling grooves 23 and 23 with the flange 221 and a pair of L- , 24) to the abdomen (223) of the vertical beam (22). The bolt fastening means 26 includes a bolt and a nut fastened thereto.

The pair of L-shaped steel guides 24 and 24 are formed by the steel plate coupling grooves 23 and 23 between the inner flanges 221 of the vertical beam 22 and through the steel plate coupling grooves 23 and 23 Both ends of the arched steel plate 30 are sandwiched and sandwiched. In this case, all the arcuate steel plates 30 are fitted into the steel plate coupling grooves 23, 23 formed between the inner flange 221 of the vertical beam 22 and the pair of L-shaped steel guides 24, 24, A reduction excavation having a radius R1 can be made.

In some cases, the pair of L-shaped steel guides 24 and 24 may be installed such that the steel plate coupling grooves 23 and 23 are formed between the outer flanges 222 of the vertical beam 22. Therefore, as shown in FIG. 7A, the excavation can be carried out by dividing the excavation into two equal parts, one being large and the other being relatively small. That is, some of the arcuate steel plates 30 are fitted into the steel plate coupling grooves 23, 23 formed between the inner flange 221 of the vertical beam 22 and the pair of L-shaped steel guides 24, 24 The other of the arcuate steel plates 30 is subjected to the reduction of the minimum radius R1 and the remaining one of the arched steel plates 30 is sandwiched between the outer flange 222 of the vertical beam 22 and the pair of L- Can be fitted to the coupling grooves 23 'and 23' so that the enlarged excavation of the maximum radius R2 can be performed simultaneously. Here, R1 < R2.

3C and FIG. 7B, all of the arched steel plates 30 are formed of steel plate coupling grooves 23 'formed between the outer flange 222 of the vertical beam 22 and the pair of L-shaped steel guides 24 and 24, 23 'so that an enlarged excavation having a maximum radius R2 can be performed.

In this way, the present method can be implemented by either reduced or enlarged excavation alternatively or concurrently, so that it is possible to cope with the change of the section of the circular structure, and the excavation time can be shortened by reducing the excavation amount.

Here, after the water expansible exponent 40 is adhered to the guide structures 20 and 20 as shown in FIG. 3A, both ends of the arched steel plate 30 may be bonded to the water expansive exponent 40.

In addition, as shown in FIG. 8, part of the arched steel plate 30 can be constructed to have different penetration depths due to the characteristics of the ground. For example, if the rock is encountered at a certain depth of the excavation site, the present method can be dealt with by reducing the penetration depth of the arcuate steel plates 30 by a step (h) have.

Then, the inside of the arched steel plate 30 arranged in a circular shape is first excavated. Excavation can be a well-known excavation equipment used in the retention method.

Then, after the first excavation, a ring support 50 is installed on the inner surface of the guide structure 20 arranged in a circular shape as shown in FIGS. 6A and 6B at least on one side in order to ensure the stability of the earth retaining excavation, . In the present embodiment, the ring girder 50 is manufactured by bending a steel material having an H section in a circular shape, but is not limited to such a cross sectional shape. The ring support 50 can be brought into close contact with the inner surface of the guide structure 20 by providing a conventional screw jack 60 between the split ends and circularly expanding to exert a supporting force.

As described above, according to the circular trapezoidal earth retaining method using the arc-shaped steel plate 30 and the guide structure 20, it is possible to minimize the excavation space required for the installation of the facilities 200 such as various circular manholes, circular piers, As a result, the utilization of the upper space becomes larger and the economy is improved by optimizing the excavation area to a minimum. Minimization of the excavation area also reduces the compensation cost of the ground, ensuring civil stability.

In addition, as shown in FIG. 2, the earth pressure is supported and distributed by an axial force (P) in the circumferential direction, which is advantageous in that it can be constructed with small member rigidity, unlike existing support members. That is, the vertical beam 22 of the guide structure 20 can have a smaller cross-section than that used in the existing earth retaining construction method, thereby enabling economical construction.

In addition, there is an advantage in that stepwise excavation and enlarged excavation can be performed alternatively or combined according to a change in cross-section of the installation structure, and the stepwise construction can be performed, and stepwise construction according to the excavation depth can be performed.

In addition, when it is difficult to install the earth anchor and the internal strut strut at the time of installation, it is possible to further secure the stability of the circular structure by installing the ring support.

In addition, compared with the conventional earth retaining method, the excavation cost is lowered, and the advantageous effect of the provisional material cost is reduced.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the above teachings. will be. The invention is not limited by these variations and modifications, but is limited only by the claims appended hereto.

20: guide structure
22: vertical beam
24: L-shaped steel guide
26: bolt fastening means
30: Arched steel plate
40: Water Expansive Indexing Agent
50: Ling Zibo

Claims (7)

Forming a perforation hole (101) arranged in a circular pattern at predetermined intervals in a planned ground (10) to be subjected to earth retaining excavation;
The guide structure 20 is inserted into the perforation hole 101 in a one-to-one correspondence manner so that the earth pressure is distributed between the guide structures 20 and 20 adjacent to the circular shape in order to distribute the axial force P in the circumferential direction (20) and having a constant radius of curvature (R1 or R2) for guiding the guiding structures (20, 20);
A step of first drilling the inside of a plurality of arcuate steel plates (30) arranged in a circle;
Installing a ring support (50) at least on one side of the inner surface of the guide structure (20) arranged in a circular shape after the first excavation to secure the stability of the earth retaining excavation, and then performing the remaining excavation,
The guide structure 20 includes a vertical beam 22 made of steel and having an H-section by inner and outer flanges 221, 222 and abdomen 223; And a pair of L-shaped steel guides 24 (24 ', 24') which are provided to be opposed to each other in the abdomen portion 223 of the vertical beam 22 to form a steel plate coupling groove 23 or 23 'between the inner flange 221 or the outer flange 222 , 24); And a bolt fastening means 26 for fastening a pair of L-shaped steel guides 24, 24 to the abdomen 223 of the vertical beam 22,
here,
The arcuate steel plates 30 are all fitted into the steel plate coupling grooves 23 and 23 formed between the inner flange 221 of the vertical beam 22 and the pair of L-shaped steel guides 24 and 24, ); &Lt; / RTI &gt;
The arcuate steel plates 30 are all fitted to the steel plate coupling grooves 23 'and 23' formed between the outer flange 222 of the vertical beam 22 and the pair of L-shaped steel guides 24 and 24, (R2);
Some of the arcuate steel plates 30 are fitted into the steel plate coupling grooves 23 and 23 formed between the inner flange 221 of the vertical beam 22 and the pair of L-shaped steel guides 24 and 24, And the remaining one of the arched steel plates 30 is subjected to a reduction engaging operation of the steel plate engaging groove 31 formed between the outer flange 222 of the vertical beam 22 and the pair of L- (23 ', 23') so that the enlarged excavation of the maximum radius (R2) is performed in parallel; Wherein the excavation is performed by using any one of the arched steel plates and the guide structure. The method according to claim 1,
Further comprising the step of adhering the water-swellable exponent (40) to the guide structures (20 and 20) and then joining both ends of the arch-shaped steel sheet (30) to the water-expansive exponent (40) Circular temporary seismic retaining method using structure. delete The method according to claim 1,
Wherein a part of the arcuate steel plates (30) is constructed so as to have different depths of penetration by the step (h), and a circular hypothetical earth retaining method using the arch type steel plate and the guide structure. delete delete delete

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