KR20240138894A - Construction method of earth retaining wall and continuous underground wall - Google Patents

Abstract

The present invention relates to a method for constructing a retaining wall and an underground continuous wall. The present invention includes a drilling step of forming a plurality of perforations so as to overlap each other along a boundary portion of a building and installing a hollow casing in the perforations for maintaining the perforations, a reinforcing body installation step of installing a reinforcing body in at least a portion of the hollow casing so that a joint portion of the reinforcing body faces the inside of the building, and installing a temporary member for filling a joint portion between the reinforcing body and the hollow casing together with the reinforcing body, or filling a joint portion between the reinforcing body and the hollow casing with a filler after the installation of the reinforcing body, a concreting step of pouring concrete into the hollow casing and removing the hollow casing to form a concrete block in which the reinforcing body is embedded, and a finishing step of removing the temporary member and the filler after the concreting step.

Description

{Construction method of earth retaining wall and continuous underground wall}

The present invention relates to the fields of construction and civil engineering, and more specifically, to a method for constructing an earth retaining wall and an underground continuous wall for the purpose of earth retaining and water blocking.

The retaining wall method is a temporary structure installed to prevent the collapse of the excavation surface or the inflow of soil by resisting earth pressure and water pressure as a means of securing a working space for the installation of underground structures. The method is selected and applied by considering the on-site conditions and surrounding circumstances (land conditions, groundwater level distribution, underground facilities, adjacent facilities, etc.) to satisfy stability, constructability, and economy.

Known methods of retaining walls include thumb piles + soil retaining plates, sheet pile walls, cast-in-place concrete pile (C.I.P) slab walls, soil cement walls (S.C.W), and slurry walls.

The concrete-in-place protrusion (C.I.P) method is a method of forming a retaining wall by inserting H-piles and rebar after individually drilling a predetermined diameter using an O-R or T4 device and then pouring concrete. Although it has the advantage of minimizing damage to adjacent structures as a rigid wall, it has problems with low economic efficiency because the verticality decreases at deep depths, the joints between holes are weak, and a separate waterproofing method must be applied for water blocking. For example, a special cutting-edge device that uses a double-pipe rod for a waterproofing function as a post-process is combined to form an induction space in the target ground and a waterproofing method is separately added to improve the ground using a liquid with a gel time close to purity or a liquid and ultrafine cement mixture. Therefore, a solution that can solve these shortcomings of the concrete-in-place protrusion (C.I.P) method is required.

The present invention has been made to solve the above-mentioned problems, and its purpose is to provide a method for constructing a soil retaining wall and an underground continuous wall, which are easy to secure integrity with another member.

In order to solve the above-mentioned problem, the present invention proposes a method for constructing a retaining wall and an underground continuous wall using a concrete structure, the method comprising: a drilling step of forming a plurality of perforations so as to overlap each other along a boundary portion of the building, and installing a hollow casing in the perforations for maintaining the perforations; a reinforcing body installation step of installing a reinforcing body in at least a portion of the hollow casing such that a joint portion of the reinforcing body faces the inside of the building, and installing a temporary member interposed at a joint portion between the reinforcing body and the hollow casing together with the reinforcing body, or filling the joint portion between the reinforcing body and the hollow casing with a filler after the installation of the reinforcing body; a concreting step of pouring concrete into the inside of the hollow casing and removing the hollow casing to form a concrete block in which the reinforcing body is embedded; and a finishing step of removing the temporary member and the filler after the concreting step.

The joint portion of the above reinforcing body has a joint groove formed, and during the reinforcing body installation step, the reinforcing body can be installed in a state where the joint groove is covered by a detachable plug.

The above temporary member may be formed of at least one of Styrofoam, other resin, and silicone materials.

The joint of the above reinforcement body has a joint groove formed,

The above temporary member can be interposed between the inner end face of the building at the joint of the above reinforcing body and the above hollow casing to cover the above joint groove.

The above-mentioned perforation step may include an auxiliary casing installation step of installing a plurality of auxiliary casings by perforating the ground, each auxiliary casing having grooves formed on both sides for connection with the main casing, while leaving a gap between the plurality of auxiliary casings at which the main casings are to be installed; and a main casing installation step of installing the plurality of main casings by perforating the ground between the plurality of auxiliary casings installed by the auxiliary casing installation step.

The cross-section of the above main casing may have a circular structure, and the cross-section of the groove portion of the above auxiliary casing may have a curved structure.

The above auxiliary casing installation step may include a main casing temporary installation step of temporarily installing the main casing on the ground; an auxiliary casing insertion step of installing the auxiliary casing by inserting it into the main casing; and a main casing temporary removal step of temporarily removing the main casing while maintaining the auxiliary casing installed by the auxiliary casing insertion step in a state of being installed on the ground.

The above auxiliary casing insertion step may further include a step of positioning the auxiliary casing at the center of the main casing by inserting a spacer between the inner surface of the main casing and the outer surface of the auxiliary casing.

The above auxiliary casing insertion step may further include an auxiliary casing side filling step of filling the space between the main casing and the auxiliary casing by backfilling with a filler after the above auxiliary casing insertion step.

In addition, in order to solve the above-mentioned problem, the present invention proposes a method for constructing a retaining wall and an underground continuous wall, characterized by including a drilling step of forming a hole in the ground and installing a hollow casing in the hole for maintaining the hole, in order to construct the above-mentioned concrete structure; a reinforcing body installation step of installing a reinforcing body in at least a portion of the hollow casing, and installing a temporary member interposed in a joint portion between the reinforcing body and the hollow casing together with the reinforcing body, or filling the joint portion between the reinforcing body and the hollow casing with a filler after the installation of the reinforcing body; a concreting step of pouring concrete into the hollow casing and removing the hollow casing to form a concrete block in which the reinforcing body is embedded; and a finishing step of removing the temporary member and the filler after the concreting step.

The present invention provides a construction method that enables sufficient strength to be secured, while having a high order effect and allowing the joint of a reinforcing body to be exposed, thereby easily securing integrity with another member.

Figure 1 is a diagram of the top-down method.
Figure 2 is a cross-sectional view of a concrete structure according to the first embodiment.
Figure 3 is a cross-sectional view of the perforation step and reinforcement installation step of the construction method according to the first embodiment.
Figure 4 is a cross-sectional view after the concrete work stage of the construction method according to the first embodiment.
Figure 5 is a cross-sectional view of a concrete structure according to the second embodiment.
Figure 6 is a plan view of the auxiliary casing installation stage of the perforation stage.
Figure 7 is a plan view of the main casing installation stage of the perforation stage.
Figure 8 is a plan view of the auxiliary casing inserted inside the main casing.

The present invention can have various modifications and can take various forms, and thus, the implementation examples (or examples) are described in detail in the text. However, this is not intended to limit the present invention to a specific disclosed form, and it should be understood that it includes all modifications, equivalents, or substitutes included in the spirit and technical scope of the present invention.

The terminology used herein is only used to describe specific implementations (or examples) and is not intended to be limiting of the present invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, it should be understood that the terms "comprises" or "consists of" etc. are intended to specify the presence of a feature, number, step, operation, component, part or combination thereof described in the specification, but do not exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms defined in commonly used dictionaries, such as those defined in common usage, should be interpreted as having a meaning consistent with the meaning they have in the context of the relevant art, and will not be interpreted in an idealized or overly formal sense unless expressly defined in this application.

Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings.

Figure 1 is a drawing showing a method of constructing a building using a universal top-down method. The top-down method is a method of forming an underground structure by first constructing an underground structural wall (12) before excavation work, and then repeating the underground slab and earthwork from top to bottom in stages. That is, the universal top-down method includes work of installing and removing the formwork because it installs a formwork for constructing the main wall (i.e. permanent wall) of a building and then pours concrete. However, the present invention does not require work of installing and removing the formwork.

As illustrated in FIG. 2, a concrete structure (10) according to the construction method of the earth retaining wall and the underground continuous wall of the present invention may be configured to include a concrete block (20) formed by concrete, and a reinforcing body (30) embedded in the concrete block (20) such that a joint (32) is formed and the joint (32) is exposed to the outside of the concrete block (20).

That is, as the joint (32) of the reinforcing body (30) is exposed, the concrete structure (10) according to the construction method of the present invention can be joined to another member (e.g., slab, beam, etc.) by the joint (32) of the reinforcing body (30).

Accordingly, the concrete structure (10) according to the construction method of the present invention can obtain the effect that the integrity with another member can be easily secured. In particular, since the joint portion of the concrete block (20) does not need to be crushed to secure the aforementioned integrity, the effect of preventing cracks in the concrete block (20), etc. can be obtained. In addition, since the joint portion (32) is formed integrally with the reinforcing body (30), the joint portion (32) can be firmly and stably supported, and through the joint portion (32) of the reinforcing body (30), excellent joint integrity can be secured between the concrete structure (10) according to the construction method of the present invention and another member, and the effect of increasing constructability can be obtained.

Meanwhile, the concrete block (20) may be formed into a wall structure as illustrated, depending on the purpose of the concrete structure (10) according to the construction method of the present invention, or may be formed into various structures such as pillars, although not illustrated.

The reinforcing body (30) may have any shape of structure, and may take the form of an H-beam structure, which is widely used in the construction and civil engineering fields.

Here, when a pair of mutually parallel panels among the reinforcements (30) of the H beam are referred to as horizontal panels (34) and a panel installed between the pair of horizontal panels (34) is referred to as a vertical panel (36), it is more preferable that the joint (32) of the reinforcement (30) be formed to protrude from one of the pair of horizontal panels (34). That is, since the joint (32) of the reinforcement (30) is formed on the horizontal panel (34), the design and manufacturing of the reinforcement (30) are easy, and the method for exposing the joint (32) of the reinforcement (30) can be made easy.

If the joint (32) of the reinforcing body (30) is formed with a groove for jointing as shown in FIG. 2, only the groove may be exposed while inserted into the concrete block (20). Alternatively, as shown in FIG. 5, the joint (32) of the reinforcing body (30) itself may protrude to the outside of the concrete block (20).

The joint (32) of the reinforcing body (30) can be formed in various ways depending on the structure of the reinforcing body (30), etc., and for example, can be formed integrally by joining to the horizontal panel (34) of the reinforcing body (30) by welding or the like.

The joint (32) of the reinforcing body (30) can be formed in various structures depending on the joint structure, etc., and preferably, a universal concrete structure is joined by a reinforcing bar joint, and as illustrated, a joint groove (32A) can be formed for reinforcing bar insertion, etc.

The construction method of the earth retaining wall and the underground continuous wall of the present invention can be constructed by various construction methods, but can be constructed by the following construction methods.

First, as shown in Fig. 3, a hollow casing (100, 200) is installed in the perforation (H) to maintain the perforation (H) while perforating the ground, and then a reinforcing body (30) can be installed in the hollow part of the hollow casing (100, 200).

At this time, the horizontal panel (34) of the reinforcing body (30) can be installed in close contact with the inner surface of the hollow casing (100, 200) so that the joint location space (S1) to be described later can be separated from the concrete pouring space (S2) as illustrated, and although not illustrated, it can also be installed with a gap from the inner surface of the hollow casing (100, 200).

In addition, if a joint groove (32A) is formed in the joint portion (32) of the reinforcing body (30), the reinforcing body (30) can be installed with the joint groove (32A) of the joint portion (32) of the reinforcing body (30) covered with a detachable plug (400) to prevent foreign substances such as filler (304) or surrounding soil, concrete, etc., which will be described later, from flowing into the joint portion (32) of the reinforcing body (30). The plug (400) can be attached or detached from the joint portion (32) of the reinforcing body (30) by a screw connection method, and may be attached or detached from the joint portion (32) of the reinforcing body (30) in any other manner.

In addition, as described below, when a concrete structure (10) according to the construction method of the present invention is constructed as an underground structural wall that also serves as a retaining wall of a building, the reinforcing body (30) may be installed in the hollow casing (100.200) so that the joint portion (32) of the reinforcing body (30) faces particularly toward the inside of the building so that the concrete structure (10) according to the construction method of the present invention can be connected to a horizontal member (e.g., slab, beam, etc.) of the building.

In addition, a block-shaped temporary member (302) can be installed to fill the joint location portion (hereinafter referred to as 'joint location space (S1)') between the reinforcing body (30) and the hollow casing (100, 200).

The temporary member (302) may be installed in the hollow casing (100,200) together with the reinforcing member (30) by being connected to the reinforcing member (30) before the reinforcing member (30) is inserted into the hollow casing (100,200), and, if necessary, may be installed after the reinforcing member (30) is inserted into the hollow casing (100,200).

The temporary member (302) may be formed in multiple parts that can be detachably attached to each other rather than being formed integrally along the depth direction of the perforation (H). The temporary member (302) may be positioned along the entire length of the reinforcing body (30), or may be positioned only at the joint (32) of the reinforcing body (30).

If the temporary member (302) can be maintained in the state of being installed in the joint location space (S1) due to the surrounding ground or its own shape or structure, it does not need to be connected to the reinforcing member (30), and if necessary, it can be connected to the reinforcing member (30) by a bolt or the like.

The temporary member (302) can be formed into various structures depending on the degree of exposure of the joint (32) of the reinforcing member (30).

For example, in a case where only the joint groove (32A) of the joint portion (32) of the reinforcing body (30) is exposed as illustrated in FIGS. 2 to 4, the temporary member (302) may be installed between the end of the joint portion (32) of the reinforcing body (30) and the hollow casing (100, 200) to fill a portion of the joint portion location space (S1) and also cover the joint groove (32A) of the joint portion (32) of the reinforcing body (30). Alternatively, although not illustrated, as illustrated in FIG. 5, in order to allow the entire joint portion (32) of the reinforcing body (30) to be exposed, the temporary member (302) may be formed to fill the entire joint portion location space (S1).

The temporary member (302) may be formed of various materials, and in particular, as described later, may be formed of at least one of Styrofoam or other resins (e.g., plastic, etc.), silicone, etc. so that it is easy to remove, has sufficient strength during the concrete work step described later, and can be recycled.

Next, as shown in Fig. 4, the concrete work step can be performed.

That is, concrete is poured into the interior of the hollow casing (100, 200) and the hollow casing (100, 200) is removed. At this time, it goes without saying that the concrete pouring is performed only in areas other than the area where the temporary member (302) is installed.

Next, after the concrete work step as described above, if the temporary member (302) is removed, a concrete structure (10) according to the construction method of the present invention can be formed.

That is, the concrete structure (10) of Fig. 2 has the joint (32) of the reinforcing body (30) inserted into the concrete block (20), but the joint groove (32A) of the joint (32) of the reinforcing body (30) is exposed. In this case, since the entire reinforcing body (30), including the joint (32) of the reinforcing body (30), can be embedded in the concrete block (20), it can be structurally more stable.

Meanwhile, the concrete structure (10) according to the construction method of the present invention can be constructed by another construction method as shown in FIG. 5.

According to another embodiment of the present invention, after installing a reinforcing body (30) inside a hollow casing (100, 200) after perforation (H), the joint location space (S1) can be filled with a filler (304) such as sand in a pouring manner.

After the filling work of the filler (304) is completed in this manner, concrete is poured into the interior of the hollow casing (100, 200) and the hollow casing (100, 200) is removed. Then, when the filler (304) is removed, a concrete block (20) with a reinforcing body (30) embedded as shown in FIG. 5 can be formed.

Here, if the ground surrounding the concrete structure (10) is excavated or dug up after the concrete structure (10) is formed, the filler (304) can be removed during the excavation or dug up stage.

The construction method of the earth retaining wall and the underground continuous wall of the present invention can be adopted for various purposes, such as columns as well as various wall structures in the construction and civil engineering fields.

In particular, by using the construction method of the earth retaining wall and the underground continuous wall of the present invention, an underground structural wall (12) that also functions as an earth retaining wall of a building can be constructed as shown in FIG. 2.

That is, the construction method of the retaining wall and the underground continuous wall according to the present invention comprises: a drilling step of forming a plurality of perforations (H) so as to overlap each other along the boundary of a building and installing a hollow casing (100, 200); a reinforcing body installation step of installing reinforcing bodies (30) in at least some of the hollow casings (100, 200) so that the joint portion (32) of the reinforcing bodies (30) faces the inside of the building, and installing a temporary member (302) filling the joint portion between the reinforcing bodies (30) and the hollow casing (100, 200) together with the reinforcing bodies (30), or filling the joint portion between the reinforcing bodies (30) and the hollow casing (100, 200) with a filler (304) after the installation of the reinforcing bodies (30); It can be configured to include a concrete work step of forming a concrete block (20) in which a reinforcing body (30) is embedded by pouring concrete into the interior of a hollow casing (100, 200) and removing the hollow casing (100, 200); and a finishing work step of removing the temporary member (302) and filler (304) after the concrete work step.

That is, the construction method of the earth retaining wall and the underground continuous wall according to the present invention basically involves pre-constructing the underground structural wall (12) of the building, which is a permanent structure, prior to excavation work, so that the underground structural wall (12) of the building also functions as the earth retaining wall, which is a temporary structure.

In this way, the construction method of the underground structural wall of a building can achieve the following effects.

First, the joint (32) of the reinforcing body (30) is exposed from the concrete block (20), so it can be easily and firmly joined and integrated with horizontal members such as a slab (2) or beam to be installed later.

Second, because it also serves as a temporary structure, the construction period can be shortened, and costs such as manpower, equipment, and damage to the temporary structure due to construction and dismantling of the temporary structure can be significantly reduced.

Third, since the underground structural wall (12) of the building itself is structurally very strong, strut construction to support the existing earth retaining wall, etc. can also be omitted. Therefore, after the underground structural wall of the building is constructed, there will be no interference with the temporary structures when constructing structural members such as slabs, girders/beams, and walls, so constructability can be improved.

Fourth, since multiple piles are formed as a slurry wall structure that is continuously connected in an overlapping state, a perfect water-proofing effect can be expected, preventing collapse accidents, etc.

Meanwhile, the above-described perforation step can be performed as follows with reference to FIGS. 6 to 8.

First, as shown in Fig. 6, a plurality of auxiliary casings (200) having grooves (210) formed on both sides for connection with the main casing (100) are installed on the ground, and the main casing (100) is installed with a gap between the plurality of auxiliary casings (200).

Thereafter, as shown in Fig. 7, the ground between the plurality of auxiliary casings (200) is perforated (H) to install the plurality of main casings (100).

Here, a groove (210) for joining with the main casing (100) is formed in the auxiliary casing (200), so that the main casing (100) and the auxiliary casing (200) can form a protruding and recessed joining structure as described above, and this can be implemented by various embodiments.

According to one embodiment, the cross-section of the main casing (100) may be formed by a circular structure, and the cross-section of the groove portion (210) of the auxiliary casing (200) may be implemented by a curved structure.

The auxiliary casing (200) can be installed by itself into the ground or inserted after drilling (H). However, in order to utilize existing excavation equipment such as an auger, as illustrated in FIG. 8, it is preferable to temporarily install the main casing (100) into the ground, insert the auxiliary casing (200) into the main casing (100), install it, and then temporarily remove the main casing (100) while maintaining the installed auxiliary casing (200) in the ground. In the work of inserting the auxiliary casing (200) into the main casing (100) and the work of temporarily removing the main casing (100), it is preferable to insert a spacer (220) between the inner surface of the main casing (100) and the outer surface of the auxiliary casing (200) in order to position the auxiliary casing (200) in the center of the main casing (100).

In addition, when the space between the main casing (100) and the auxiliary casing (200) is filled by backfilling with filler (230) after the auxiliary casing (200) insertion step, there is an advantage in that the work of perforating (H) the area between the auxiliary casings (200) for installation of the main casing (100) can be performed more smoothly. To this end, it is preferable to use a filler (230) that is easy to perforate, such as sand or low-strength mortar.

By proceeding with the perforation steps in this way, you can obtain the following effects.

That is, the auxiliary casing (200) and the main casing (100), which serve as the formwork of the underground structural wall, are installed in a mutually interlocking structure, and after pouring concrete therein, the hollow casings (100, 200) are removed before the concrete is cured. As curing progresses, the concrete poured inside the auxiliary casing (200) and the concrete poured inside the main casing (100) form a strong bond at the joint.

Therefore, by adopting a configuration of a cast-in-place pile method such as the C.I.P. method, it is possible to obtain excellent strength while preventing the problem of water flowing between piles due to the gap between the unit piles of the existing C.I.P. method, thereby obtaining an underground structural wall that can satisfy both high strength and excellent water-proofing effect.

In practice, since the concrete pouring and removal of the hollow casings (100, 200) for a plurality of hollow casings is difficult to perform in a single operation, it will be performed sequentially in a certain direction from some hollow casings (100, 200). In this case, the concrete pouring operation is performed sequentially from one of the plurality of auxiliary casings (200) and the main casing (100), and it is preferable that the removal order of the auxiliary casings (200) and the main casing (100) be performed sequentially according to the concrete pouring order during the concrete pouring.

Meanwhile, in the construction method according to the present invention, in order to obtain an underground structural wall formed integrally, it is important to remove the hollow casing (100, 200) before curing of the concrete poured into the hollow casing (100, 200).

If the size of the underground structural wall is large and the work cannot be completed in one day, there is a risk of leakage at the joint between the section worked on the previous day and the section to be worked on the next day.

To prevent this, it is desirable that construction be carried out as follows.

First, it is necessary to continuously form a second unit wall (B) by performing a second operation of installing a second auxiliary casing, installing a second main casing, installing a second reinforcing body, and removing a second concrete-cast hollow casing, which is identical to the steps described above, adjacent to the first unit wall (A) formed by the first operation according to the steps described above.

More specifically, the end portion of the above first operation is terminated with the auxiliary casing (200) installed to form the first unit wall (A).

In the next operation, the first secondary auxiliary casing (200b) among the multiple auxiliary casings (200) is installed at a distance from the main casing (100) on the end side of the primary unit wall (A).

Thereafter, the first secondary main casing (100b) among the plurality of main casings (100) is installed between the end portion of the primary unit wall (A) and the first secondary auxiliary casing (200b), and the remaining hollow casings (100, 200) are installed in the same manner as in the case of the primary unit wall (A), and by performing the reinforcing body installation, concrete pouring, and hollow casing removal operations in the same manner as described above, a secondary unit wall (B) integrated with the primary unit wall (A) can be obtained.

The first unit wall (A) and second unit wall (B) constructed in this manner form an overall continuous structure, so they have the advantage of being able to obtain an excellent water-proofing effect even though the work is carried out over several days.

Second, the first unit wall (A) can be pre-constructed by the first work according to the steps of the construction method described above. However, among the hollow casings (100, 200) installed by the first work, the hollow casings (100a, 200a) on the end side are excluded, and the concrete work step is performed.

When the first unit wall (A) is formed, the second hollow casing (100b, 200b) is installed consecutively in the hollow casing (100a, 200a) on the end side among the hollow casings (100, 200) installed by the first operation, and then concrete is poured into the hollow casing (100a, 200a) on the end side and the second hollow casing (100b, 200b) among the hollow casings (100, 200) installed by the first operation, and the hollow casing (100, 200) on which the concrete is poured is removed, thereby forming the second unit wall (B). Of course, if the 3rd unit wall is continuous with the 2nd unit wall (B), the hollow casing at the end of the 2nd hollow casing (100b, 200b) can also be excluded from the 2nd concrete work stage.

Thirdly, after forming the primary unit wall (A) through the primary operation, the secondary unit wall (B) is formed through the secondary operation at a distance sufficient to install the main casing (100c) or auxiliary casing to be performed the third operation described later. Next, after installing the third main casing (100c) or auxiliary casing between the primary unit wall (A) and the secondary unit wall (B), concrete is poured into the interior of the third main casing (100c) or auxiliary casing, and when the third main casing (100c) or auxiliary casing is removed, the primary unit wall (A) and the secondary unit wall (B) can be connected integrally.

At this time, if the perforation formed between the primary unit wall (A) and the secondary unit wall (B) can be maintained without the hollow casing (100, 200), the 3rd main casing (100c) or auxiliary casing can be omitted.

The above is only a description of some of the preferred embodiments that can be implemented by the present invention, and therefore, as is well known, the scope of the present invention should not be construed as being limited to the above embodiments, and the technical ideas of the present invention described above and the technical ideas underlying them are all included in the scope of the present invention.

10; concrete structure 20; concrete block
30; Reinforcement 32; Joint
100; Main casing 200; Auxiliary casing
302; Temporary Absence 304; Filler

Claims (3)

In the construction method of a retaining wall and an underground continuous wall for the purpose of retaining soil and blocking water,
A perforation step of forming a plurality of perforations so as to overlap each other along the boundary of a building and installing a hollow casing in the perforations to maintain the perforations;
A reinforcement installation step of installing the reinforcement in at least a portion of the hollow casing so that the joint of the reinforcement faces the inside of the building, and installing a temporary member filling the joint location between the reinforcement and the hollow casing together with the reinforcement, or filling the joint location between the reinforcement and the hollow casing with a filler after installing the reinforcement;
A concrete work step of pouring concrete into the interior of the hollow casing and removing the hollow casing to form a concrete block with the reinforcement embedded therein;
After the above concrete work step, a finishing work step of removing the temporary materials and filler;
A method for constructing a soil retaining wall and an underground continuous wall, characterized by including a . In claim 1,
The above perforation step
An auxiliary casing installation step in which a plurality of auxiliary casings having grooves formed on both sides for joining with the main casing are installed by boring the ground, and the auxiliary casings are installed with an interval between the plurality of auxiliary casings at which the main casing is installed;
A main casing installation step for installing the plurality of main casings by boring the ground between the plurality of auxiliary casings installed by the auxiliary casing installation step;
A method for constructing a soil retaining wall and an underground continuous wall, characterized by including a . In claim 2,
A method for constructing a retaining wall and an underground continuous wall, characterized in that the cross-section of the main casing has a circular structure and the cross-section of the groove of the auxiliary casing has a curved structure.