KR100781809B1 - Method for constructing underground structure - Google Patents

Abstract

The present invention relates to an underground structure construction method, comprising: a first step of forming a plurality of support pillars in the ground at a plurality of points along an outer wall installation position of an underground structure; A second step of respectively installing guide pillars on the plurality of support pillars; A third step of installing a hollow member having a diameter larger than that of the guide pillar around the guide pillar; A fourth step of forming an outer wall between the two hollow members so as to be integral with the hollow member, and forming a slab having work tools for excavation and lifting of earth and sand on top of the plurality of outer walls to complete one structure on the ground; A fifth step of mounting a press-fit device on the guide pillar; By operating the indentation apparatus, the structure is pressed into the ground together with the hollow member guided by the support pillar, excavating the soil through the work tool and then reindenting the underground structure to the required depth to the required depth Repeatingly indenting the structure; And a seventh step of forming the underground bone structure by repeating the third to sixth steps.

The underground structure construction method can be easily constructed regardless of the shape, use, location and depth of construction of the structure, there is an advantage that easy to form a plurality of layers of structures.

Description

Method for constructing underground structure

1 is a view showing an embodiment of the underground structure construction method of the present invention,

2a to 2d is a view showing a process of forming a support pillar in the ground according to the method of the present invention,

3 shows the overcut head shown in FIG. 2c in more detail;

4 is a view showing another embodiment of forming a support pillar in the ground,

5 is a plan view showing a form in which tip shoes are installed between a plurality of hollow members in the method of the present invention;

6 is a plan view showing a form in which an outer wall is formed between a plurality of hollow members in the method of the present invention;

7 is a plan view showing a state in which the slab is formed on the outer wall in the method of the present invention,

8 is an enlarged perspective view of a part of FIG. 1;

9 is a perspective view showing a part of the indentation apparatus;

10 is a perspective view showing another installation example of the auger screw guide;

11 is a view showing an embodiment in which the first floor underground structure is constructed according to the present invention;

12 is a view showing an embodiment in which a four-story underground structure is constructed according to the present invention;

FIG. 13 is a view showing an embodiment regarding the construction of a circular underground structure.

<Description of the symbols for the main parts of the drawings>

100: support pillar 200: press-fit device

210: guide pillar 220: ski

230: hydraulic jack 300: outer wall

310: hollow member 320: tip shoe

330: Auger screw guide hole 510: beam mounted ski

520: Auger screw mounting beam 530: Auger screw

550: crane 600,700,800: underground structure floor

The present invention relates to an underground structure construction method, and more particularly to an underground structure construction method for forming the underground structure on the ground and press-fitted into the ground along the guide pillar or support pillar.

Conventionally, the basement construction method is to excavate the earth and sand after installing the temporary facility in the basement construction position, install a wall to prevent the earth and earth collapse by using a number of H-beams and earth plate, then assemble the formwork and cast concrete The so-called temporary construction, which constructs the basement walls, was the mainstream.

However, when the underground structure is constructed by the temporary construction method as described above, when the underground excavation work is difficult due to excessive groundwater inflow, construct the earth and sand collapse prevention structure using H-beam and order grouting earth plate, and then excavate the excavation work. And the underground structure must be constructed, there is a disadvantage that the process water increases and the air is extended.

In addition, there is a possibility of long-term stratum deformation due to impossibility of perfect backfilling of H-shaped steel drawing space and earth plate installation and earth plate dismantling site, which may result in peripheral hazards and closures that continue to settle after completion. . In other words, the space filled with soil is so narrow that perfect compaction work cannot be performed smoothly. Also, the backfilled area is deformed or settled by inducing deformation to the surrounding stable ground floor. As mentioned above, buildings and roads are damaged.

Accordingly, an object of the present invention is to provide a construction method that can form the underground structure to be precisely indented in a simpler way to build the underground structure on the ground.

Underground structure construction method of the present invention for achieving this object, the first step of forming a plurality of support pillars in the ground at a plurality of points along the outer wall installation position of the underground structure; A second step of respectively installing guide pillars on the plurality of support pillars; A third step of installing a hollow member having a diameter larger than that of the guide pillar around the guide pillar; A fourth step of forming an outer wall between the two hollow members so as to be integral with the hollow member, and forming a slab having work tools for excavation and lifting of earth and sand on top of the plurality of outer walls to complete one structure on the ground; A fifth step of mounting a press-fit device on the guide pillar; By operating the indentation apparatus, the structure is pressed into the ground together with the hollow member guided by the support pillar, excavating the soil through the work tool and then reindenting the underground structure to the required depth to the required depth Repeatingly indenting the structure; And a seventh step of forming the underground bone structure by repeating the third to sixth steps.

In another embodiment, in the seventh step, the third to sixth steps may be repeated two or more times to form two or more underground bone structures.

Preferably, the step of forming the support pillar, if there is a rock under the soil, the step of pressing the steel pipe in the ground and excavating the soil in the steel pipe pipe with an auger screw; Inserting a small diameter pipe bent at a predetermined curvature into the steel pipe pipe and inserting a punching hammer along the curved small diameter pipe to perforate the rock, and drilling the rock at an appropriate interval in all directions; It may include; and the step of forming a pillar by pouring reinforced concrete in the hole drilled in the steel pipe and rock.

In addition, when the fourth step is performed for the first time, a tip shoe made of an iron plate having a needle end at the lower end between each of the two hollow members may be provided prior to forming the outer wall.

The indentation apparatus, the ski is installed to move up and down on the outer peripheral surface of the guide pillar; It may include; one or more hydraulic jacks coupled to one side of the ski.

Preferably, a plurality of auger screw guide holes are formed in the outer wall, and auger screw mounting beams having both ends coupled to two skis provided to be movable up and down on the guide pillar are provided with a plurality of auger screws passing through the guide holes. Can be configured to be mounted.

Alternatively, the plurality of auger screws passing through the guide hole may be mounted to a crane installed on the guide pillar, and the crane may be configured to adjust the height by a hydraulic cylinder.

The underground structure construction method constructed in this way forms an underground structure on the ground and presses it along the guide pillar or support pillar, so that it can be easily constructed regardless of the shape, use, or depth of installation of the underground structure, and multiple layers of underground The structure also has the advantage that it can be easily constructed.

In addition, it is not necessary to construct the structure after excavating the conventional soil, but to excavate the soil after pressing the structure into the ground, so it is not necessary to construct a temporary earthquake, and it is possible to construct an underground structure without fear of soil collapse or groundwater inflow. have.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the underground structure construction method according to the present invention.

1 illustrates an embodiment of the present invention. In the underground structure construction method of the present invention, first, a plurality of support pillars 100 are formed in the ground at a plurality of points along the outer wall installation position of the underground structure.

Referring to this step with reference to Figures 2a to 2d, after pressing the steel pipe (STPIPE, 20) in the ground (Fig. 1a), using the auger screw 30 to excavate the soil in the steel pipe pipe 20 (FIG. 1B), the reinforced concrete is poured to form columns.

At this time, in order to withstand the reaction force acting on the indentation device during the indentation of the underground structure, it is preferable that the lower portion is formed in a shape having a large diameter and a relatively small diameter. To this end, after excavating the soil in the steel pipe pipe 20, the overcut head 400 is coupled to the end of the auger screw 30 to expand the hollow diameter below the bottom of the steel pipe pipe 20 (FIG. 1C).

When the over-cutting head 400 is inserted into the pipe as shown in more detail in FIG. 3, the expansion blade 430 is inserted while being folded, and when the rotation starts, the expansion blade 430 is expanded to spread the soil to a larger diameter. It has a structure that can be excavated.

More specifically, the over cutting head 400 has a center rod 410, a fixing portion 420 coupled to the outside of the center rod 410, and one end of the over cutting head 400 can be folded in the fixing portion 420 The other end includes an expansion blade 430 coupled to the excavation cutting blade 432 at the other end.

The center rod 410 is preferably formed to be coupled to the end of a conventional ocher screw used for earth excavation. The fixing part 420 coupled to the outer circumferential surface of the center rod 410 may have any shape as long as the extension blade 430 can be foldably fixed, and may be a plate as shown in FIG. 3. . One end of the expansion blade 430 is coupled to the fixed portion 420 so that it can be folded, it can be coupled using a conventional hinge coupling portion 431. The expansion blade 430 is coupled to a position that enters a predetermined distance inward from the outer end of the fixing portion, the support space 421 between the point where the fixing portion and the extension wings are coupled, and the outer end of the fixing portion It is desirable to allow this to be formed. The support space 421 serves to maintain the expanded state by supporting the extension blades so as not to be completely removed from the opposite side when the extension blades are expanded as shown in FIG. 3. In FIG. 3, the solid line shows the expansion wing 430 folded and the dotted line shows the expanded state. Opposite ends of the expansion blade 430 are coupled to the cutting blade 432 for earth excavation. On the other hand, the lower portion of the fixing portion 420 is formed to gradually become narrower toward the bottom, the cutting edge 422 is preferably coupled to the outside.

After the excavation of the lower portion of the steel pipe pipe 30 through the over-cutting head 400, the auger screw and the over-cutting head 400 coupled thereto are removed, and the rebar is placed, and then concrete is poured and the concrete is shown in FIG. 1D. A support pillar 100 having a shape as described above is formed in the ground. That is, the support pillar is composed of an upper pillar 110 having the same diameter as the outer diameter of the steel pipe pipe, and a lower pillar 120 having a larger diameter located below it.

As another example, the support pillar may be formed as shown in FIG. 4. This is a process that can be used, especially when rock 2 is present below the earth and sand 1, first press the steel pipe 20 in the ground and excavate the sand in the steel pipe 20 with an auger screw 30. do. Then, the small diameter pipe 40 bent in a predetermined curvature is inserted into the steel pipe pipe 20, and the punching hammer 50 is inserted along the curved small diameter pipe 40 to drill the rock 2. Repeat this process using several small diameter pipes 40 of different curvature to perforate the rock in all directions. Next, reinforced concrete is poured into the perforated holes of the steel pipe 20 and the rock to form a column.

When the support pillars 100 are formed in the ground, the guide pillars 210 (see FIG. 1) are coupled thereto. The guide pillar 210 is located on the upper ground of the support pillar 100 and is intended to guide the movement of the outer wall and the indentation device of the completed structure. The guide pillar 210 may be one in which the support pillar 100 extends to the ground.

After fixing the guide pillar 210, the hollow member 310 (see FIG. 1) formed of a steel pipe or the like is inserted into the outer circumferential surface thereof. The hollow member 310 has a larger diameter than the support pillar 100 and the guide pillar 210 and is disposed concentrically with the support pillar 100 and the guide pillar 210.

After the hollow member 310 is inserted, the tip shoe 320 is fixed between the two hollow members 310 adjacent to each other, as shown in FIG. 5. The tip shoe 320 is formed in the shape of an arrowhead or knitted arrowhead having a needle end so that it can be easily indented while cutting the earth and sand when pressing the underground structure in the ground, it is made of an iron plate. The tip shoe 320 is fixed to the hollow member 310 by bolting, welding, or the like.

Thereafter, a formwork for forming an outer wall is installed on the upper end of the tip shoe 320, a pipe for forming an auger screw guide hole is disposed in the formwork, and then a lifting ring is disposed at a predetermined position and then concrete is poured. To form an outer wall 300 as shown in FIG.

At this time, the outer wall 300 is formed to be connected to the hollow member 310, so when the structure is press-fitted the outer wall 300 is guided by the guide pillar 210 together with the hollow member 310 is pressed.

After the outer wall 300 is formed, as shown in FIG. 7, the slab 390 is formed in the horizontal direction at the top of the outer wall 300. The slab 390 may be formed with a work tool 380 for earth excavation and lifting.

As shown, a cross beam 400 may be provided across the space surrounded by the outer wall 300 as necessary. In order to prevent the outer wall from being deformed by a force acting on a wide surface of the outer wall, the cross beam 400 is fixed between two facing outer walls.

As shown in FIG. 8 in an enlarged view of a part of FIG. 1, an indentation device 200 is installed in the hollow member 310 and the upper guide pillar 210 of the outer wall 300. As shown in more detail in FIG. 9, the press-fit device 200 includes a ski 220 that can move up and down on an outer circumferential surface of the guide pillar 210, and a plurality of hydraulic jacks coupled to one side of the ski 220. 230. The lower end of the hydraulic jack 230 is provided with a ring 231 that can be fastened to the lifting ring 340 of the outer wall.

The ski 220 may have any configuration as long as it can slide up and down in the guide pillar 210, and the guide pillar (using a pin 240 as shown in order to prevent slipping in a press-fitting structure) may be used. And may be fixed on 210. The number of hydraulic jacks 230 may be changed as needed. For example, when the underground structure has a rectangular structure as shown in FIG. 1, one to four hydraulic jacks 230 may be installed in one ski 220 according to the position of the guide pillar 210. When the indentation device 200 is mounted on the guide pillar 210, the force of the hydraulic jack 230 is applied to the outer wall when the indentation device 200 is operated by combining the hook 231 and the lifting ring 240 at the bottom of the hydraulic jack 230. To work.

After installing the press-fit device 200 on the guide pillar 210, the auger screw 530 is inserted into the auger screw guide hole 330. This auger screw is for disturbing the soil in the position where the structure is press-fitted, it can be mounted to the auger screw mounting beam 520, as shown in Figure 8, the auger screw mounting beam 520 is guide pillar 210 Both ends are coupled to two beam moving skis 510 installed to be movable up and down.

Alternatively, the auger screw 530 may be mounted to the auger screw mounting beam 520 suspended on a crane 550 installed on the guide pillar 210 as shown in FIG. 10, wherein the crane 550 is a hydraulic cylinder. The height may be adjusted by 540. In addition, it can be installed in various forms for the same function.

Using the auger screw 530 configured as described above, the soil is disturbed, and the hydraulic jack is operated to press the structure to a predetermined depth. After the hydraulic jack is operated, the process of repeatedly lowering the hydraulic jack to restart the hydraulic jack may press the structure to a predetermined depth of the ground. At this time, since the hollow member 310 is pushed together by sliding the guide pillar 210 and the support pillar 100 of the ground, as a result, the structure is pressed while being guided by the guide pillar 210 and the support pillar 100.

At this time, after press-fitting the structure formed on the ground to the ground through the working tool 380 of the slab 390 and excavated the soil of the lower and presses the outer wall 300 to the depth of the excavation. This process can be repeated to indent the structure to the required depth.

This first indented structure forms the base of the underground present structure. That is, the first press-fitted structure is the base structure 500 of the basement structure 600 as shown in Figure 11 to form the bottom surface of the structure 600 while supporting the entire underground structure and prevent the inflow of groundwater, etc. Function

After the base structure 500 is press-fitted, the hollow member 310 is installed again around the guide pillar 210 (see FIGS. 1 and 8), and the outer wall 300 and the slab 390 are formed to complete the structure. Thereafter, the base structure 500 is press-fitted through the indentation apparatus 200 to form the underground main structure 600.

However, in the step of forming the underground main structure 600, since the indentation path is already formed by the indentation of the base structure 500, it is not necessary to install the tip shoe 320 before the outer wall 300 is formed.

In this way, the structure construction of the first basement floor is completed. However, as shown in Figure 12, by repeating the step of forming the underground bone structure several times, it is possible to simply build an underground structure of a plurality of layers (600, 700, 800).

In addition, in the above-described embodiment, a rectangular underground structure has been described as an example, but a circular underground structure may be constructed to be used as a foundation of a vertical shaft or a pier as illustrated in FIG. 13, or another form as required. You can also build underground structures.

As described above, according to the underground structure construction method of the present invention, since the underground structure is formed on the ground and press-fitted along the guide pillar or support pillar, it is easy to build regardless of the shape, use or depth of installation of the underground structure In addition to this, there is an advantage that it is easy to build a multi-storey underground structure.

In addition, it is not necessary to construct the structure after excavating the conventional soil, but to excavate the soil after pressing the structure into the ground, so it is not necessary to construct a temporary earthquake, and it is possible to construct an underground structure without fear of soil collapse or groundwater inflow. have.

Claims (7)

A first step of forming a plurality of support pillars in the ground at a plurality of points along the outer wall installation position of the underground structure; A second step of installing guide pillars 210 on the upper portions of the plurality of support pillars 100; A third step of installing a hollow member 310 having a diameter larger than that of the guide pillar 210 around the guide pillar 210; An outer wall 300 is formed between the two hollow members so as to be integral with the hollow member, and a slab 390 having a work tool 380 for earth excavation and lifting is formed on the upper ends of the plurality of outer walls 300. A fourth step of completing a structure on the ground; A fifth step of mounting the indentation device 200 on the guide pillar 210; By operating the indentation apparatus 200, the structure is pressed into the ground together with the hollow member guided by the support pillar 100, and excavated the earth and sand through the work tool and then re-indent the underground structure to the excavated depth A sixth step of pressing the structure by repeating the process to the required depth; And a seventh step of forming the underground bone structure by repeating the third to sixth steps. The method of claim 1, In the seventh step, the underground structure construction method, characterized in that to form two or more underground bone structures by repeating the third to six times at least two times. The method of claim 1, Forming the support pillar 100, If rock (2) is present below the soil (1), Press-fitting the steel pipe 20 into the ground and digging soil in the steel pipe 20 with an auger screw 30; Insert the small diameter pipe 40 bent at a predetermined curvature into the steel pipe pipe 20 and insert the punched hammer 50 along the curved small diameter pipe 40 to repeat the process of drilling the rock 2 to the rock. Perforating at appropriate intervals in all directions; And constructing a pillar by placing reinforced concrete in the hole drilled in the steel pipe pipe (20) and the rock. The method of claim 1, When the fourth step is performed for the first time, before the outer wall 300 is formed, the structure of the underground structure, characterized in that the tip shoe 320 made of an iron plate having a needle end at the lower end between the two hollow members is provided. Method. The method according to claim 1 or 2, The press-fit device 200, Ski 220 is installed to move up and down on the outer peripheral surface of the guide pillar 210; Underground structure construction method comprising a; at least one hydraulic jack (230) coupled to one side of the ski (220). The method according to claim 1 or 2, A plurality of auger screw guide holes 330 are formed in the outer wall 300, Auger screw mounting beams 520 having both ends coupled to two skis 510 mounted to the guide pillar 210 so as to be movable upward and downward are mounted with a plurality of auger screws 530 passing through the guide hole 330. Underground structure construction method characterized in that. The method according to claim 1 or 2, A plurality of auger screw guide holes 330 are formed in the outer wall 300, A plurality of auger screws 530 penetrating the guide hole 330 is mounted to the crane 550 installed on the guide pillar 210. The crane 550 is an underground structure construction method characterized in that the height is adjusted by the hydraulic cylinder (540).

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