KR20230030562A - Temporary retaining facility using guide bracket and ground anchor for step-by-step support of deep excavation and its construction method - Google Patents

Abstract

The present invention relates to a temporary earth retaining facility having a guide bracket and an internal lower body and a construction method thereof, which can easily perform an excavation work at low costs. The temporary earth retaining facility of the present invention, comprises: a plurality of vertically arranged thumb piles; a waling arranged across the thumb piles; a guide bracket installed at a predetermined position of the waling; and a ground anchor.

Description

Temporary retaining facility using guide bracket and ground anchor for step-by-step support of deep excavation and its construction method}

The present invention relates to a temporary earth retaining facility using a ground anchor equipped with a guide bracket and a load-bearing body and a construction method thereof, in particular, installing thumb piles before excavation, installing vertical ground anchors between the thumb piles, and excavation In the excavation location where step-by-step support is required, a wale strip to which a guide bracket can be installed is installed, and the anchoring force of the vertical ground anchor installed before excavation is used to convert the supporting force of the vertical ground anchor to horizontal tensile force in the middle of the wale strip. A guide bracket is installed, and the tension member of the ground anchor is induced and installed on the guide bracket to settle in the middle of the wale. By doing so, even without installing additional support materials such as struts and rakers on the excavation side, the thumb pile serves as a support with the load acting on the back side of the wale. It relates to a retaining facility using a ground anchor equipped with a guide bracket and a load-bearing body that can safely excavate work at low cost by supporting multiple beams without occupying, and a construction method thereof.

For the construction of underground structures, earth retaining structures are installed around the work area, which include thumb pile earth walls, diaphragm walls, sheet piles, C.I.P. A variety of techniques are being applied.

Such a conventional earth retaining method has the following problems.

In the case of excavation work, since the retaining wall alone cannot resist the earth pressure of the background soil, a large number of support materials (Strut, Earth Anchor, Raker, etc.) must be used to reinforce it.

However, in the above-described earth anchor construction method, the earth anchor is established by inserting the adjacent site by 10M or more, but when the use of the adjacent site is restricted, strut or raker method must be applied at every 2.5m excavation height, which is economical and construction conditions. There is a big downside.

In addition, the conventional method using struts and anchor holes densely installs struts at intervals of 2 to 3 m in the vertical direction of the excavation, resulting in a small working space and inconvenience in using heavy equipment. There are problems that cause considerable difficulties in construction due to invasion of private land, damage to existing structures, and inflow of nearby underground water.

Registered Patent No. 10-1498711

Accordingly, the present invention has been made to solve the above-described problems, by installing thumb piles before excavation, by installing vertical ground anchors between the thumb piles, and by providing support for each excavation stage. Install a wale that can install a guide bracket in, and install a guide bracket in the middle of the wale that can convert the supporting force of the vertical ground anchor to horizontal tensile force using the fixing force of the vertical ground anchor installed before excavation, After the tension member of the ground anchor is induced and installed on the guide bracket to fix it in the middle of the wale, the tension member is tensioned to support the load acting on the rear side of the wale with the force transmitted to the thumb pile through the wale, Even without installing support materials such as struts and rakers, the thumb pile serves as a support with the load acting on the back side of the wale, so even in a narrow space with a back site of less than 1m in deep excavation in the city center, various supports without occupying other sites on the back of the excavation Its purpose is to provide a retaining facility and its construction method using a ground anchor equipped with a guide bracket and a load-bearing body that can facilitate excavation work safely and at low cost by supporting the water level.

In order to achieve the above object, a temporary earth retaining facility using a ground anchor equipped with a guide bracket and an inner lower body according to the present invention includes thumb stakes arranged vertically with a plurality of them at predetermined intervals; A wale sheet disposed across the plurality of thumb piles; a guide bracket installed at a predetermined position of the wale; It is characterized in that the tension member is wound on the guide bracket and at the same time the other side is composed of a ground anchor fixed to the ground.

In addition, the method for constructing a temporary earth retaining facility using a ground anchor equipped with a guide bracket and an inner lower body according to the present invention for achieving the above object includes thumb stakes arranged vertically with a plurality of them at predetermined intervals; A wale sheet disposed across the plurality of thumb piles; a guide bracket installed at a predetermined position of the wale; As a method of constructing a retaining facility using a guide bracket composed of a ground anchor in which the tension member is wound on the guide bracket and the other side is fixed to the ground and a ground anchor equipped with a lower body, the ground is excavated at a constant diameter and depth to forming two through holes; Installing a thumb stake in the drilled hole; Installing a ground anchor between the thumb piles; Installing a wale with a guide bracket attached across the thumb pile; Fixing the tension member installed on the ground anchor to the guide bracket; It is characterized in that it consists of the step of applying a load to the ground on the back side in the middle of the wale by tensioning the tension member with a constant tension.

As described above, the temporary earth retaining facility and its construction method using the ground anchor provided with the guide bracket and the lower body according to the present invention have the following effects.

First, the present invention installs a guide bracket on the wale, installs the tension member of the ground anchor on the guide bracket, fixes it in the middle of the wale, and then tensions the tension member to apply the load on the rear side of the thumb pile to the middle of the wale. By applying, there is an advantage in that there is no concern that the thumb pile falls into the excavation space or collapses even if a separate support material is not installed on the excavation side.

Second, the present invention has the effect of constructing a retaining facility regardless of the wide narrowing of the ground site on the back side of the thumb pile even in a narrow space in the downtown area, regardless of before and after excavation.

Third, in the present invention, the ground anchor is installed at a depth deeper than the thumb pile, and the tension member coupled with the ground anchor tensions the middle part of the wale to extend it outside the excavation space, so that the thumb pile falls into the excavation space or collapses. There are advantages to relieving anxiety.

Fourth, the present invention can solve the retaining structure by installing several stages even at an excavation depth that requires a plurality of supports of deeper excavation.

Fifth, since the present invention can minimize the installation of support materials or wales on the excavation side, construction cost reduction and construction period reduction are greatly improved, and work space is easily secured and workability is improved.

1 is a perspective view showing a temporary earth retaining facility using a ground anchor equipped with a guide bracket and a lower body according to the present invention;
Figure 2 is a front view of the back of the excavation showing a temporary retaining facility using a ground anchor equipped with a guide bracket and a lower body according to the present invention;
Figure 3 is a plan view of the back of the excavation showing a temporary retaining facility using a ground anchor equipped with a guide bracket and a lower body according to the present invention;
Figure 4 is a cross-sectional view showing a temporary retaining facility using a ground anchor equipped with a guide bracket and a lower body according to the present invention;
Figure 5 is an exploded perspective view showing a temporary earth retaining facility using a ground anchor equipped with a guide bracket and a lower body according to the present invention;
6 is a perspective view showing a guide bracket of a retaining facility using a ground anchor equipped with a guide bracket and a lower body according to the present invention;
7 is a front view showing a guide bracket of a retaining facility using a ground anchor equipped with a guide bracket and a lower body according to the present invention;
8 is a plan view showing a guide bracket of a retaining facility using a ground anchor equipped with a guide bracket and a lower body according to the present invention;
9 is a side view showing a guide bracket of a retaining facility using a ground anchor equipped with a guide bracket and a lower body according to the present invention;
Figure 10 is a construction diagram showing a state of constructing a temporary earth retaining facility using a ground anchor equipped with a guide bracket and a lower body according to the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

[Temporary retaining facility using ground anchors equipped with guide brackets and lower bodies]

1 is a perspective view showing a retaining facility using a ground anchor equipped with a guide bracket and a lower body according to the present invention, Figure 2 shows a temporary retaining facility using a ground anchor equipped with a guide bracket and lower body according to the present invention It is a front view of an excavation back side, and FIG. 3 is a plan view of an excavation rear surface showing an earth retaining facility using a ground anchor equipped with a guide bracket and a lower body according to the present invention, and FIG. It is a cross-sectional view showing a temporary earth retaining facility using a ground anchor, and Figure 5 is an exploded perspective view showing a temporary earth retaining facility using a ground anchor equipped with a guide bracket and a lower body according to the present invention.

As shown in these drawings, the temporary earth retaining facility (P) using the ground anchor provided with the guide bracket and the lower body according to the present invention is a plurality of thumb piles 100 vertically disposed at predetermined intervals; A wale 200 disposed across the plurality of thumb piles 100; a guide bracket 300 installed at a predetermined position of the wale 200; At the same time as the tension member 420 is wound around the guide bracket 300, the other side is composed of a ground anchor 400 fixed to the ground (G).

That is, in the retaining facility (P) using the ground anchor equipped with the guide bracket and the lower body according to the present invention, the thumb pile 100, the wale 200, the guide bracket 300, and the ground anchor 400 are organic It is a structure composed of

Here, the thumb pile 100 and the wale 200 are composed of any one of section steel, H section steel, I section steel, C section steel, A section steel pipe, steel pipe, hollow pipe, round steel pipe, square pipe, and section steel.

In particular, the section steel is a general term for long steel pre-formed into a certain cross-sectional shape such as H-type and L-type, and is mainly used for civil engineering, architectural pillars or beams, foundation piles and mechanical products, and there are various types of section steel depending on the shape of the cross section. , depending on the epidemiological rationality and purpose of use.

In addition, the H-beam is made by hot rolling with an H-shaped cross section widely used in the framework of large structures such as buildings and ships or civil engineering works.

Here, the part corresponding to the horizontal bar in the center of the H-beam is called the web, and the part corresponding to the vertical bar on both sides is called the upper and lower flanges. .

In addition, there is an I-beam with a cross section similar to the H-beam. In the H-beam, the thickness of the upper and lower flanges is constant to the end, the tip of the upper and lower flanges are not rounded, and in the I-beam, the width is smaller than the height H-beams are different in that some have width equal to height.

The wide flange H-beam is called wide flange H-beam, and its overall cross section is square, making it easy to use as a pillar of a building.

Standards are specified in KS D 3503, and shapes and dimensions are specified in KS D 3051.

On the other hand, the steel pipe is a building material made of an alloy of iron and carbon, and means that the cross section is a hollow circular pipe or rectangular pipe, and it is revealed that a square pipe and pipes of various shapes can be used as needed.

In particular, it is clarified that no special technical requirements are required in using circular tubes as various tubes such as square tubes and closed tubes.

In addition, as shown in FIGS. 6 to 9, the guide bracket 300 includes a support plate 310 having a certain thickness and width; horizontal plates 320 extending at right angles from both ends of the support plate 310 at regular intervals; vertical plates 330 extending downwardly at right angles to the horizontal plates 320; It consists of left and right plates 340 and 350 welded across the vertical plates 330 and semicircular fixing pulleys 360 coupled between the left and right plates 340 and 350.

That is, in the guide bracket 300, a plurality of steel plates 310, 320, 330, 340, and 350 are vertically and horizontally bent to form a bracket, and a semicircular fixing pulley 360 is installed on the bracket.

Here, the tension member 420 is caught on the semicircular fixing pulley 360 and passed between the left plate 340 and the right plate 350, and further passed between the vertical plates 330, by the semicircular fixing pulley 360. The angle of the tension member 420 is changed from vertical to horizontal and extends to the side of the wale 200 .

In addition, as shown in FIG. 1, the ground anchor 400 includes a lower body 410 having a constant weight and disposed at the lower end; It is composed of a tension member 420 having one side embedded in the lower body 410 and at the same time drawing a certain length to the other side.

That is, the ground anchor 400 has a structure in which the lower body 410 and the tension member 420 are organically coupled.

Here, the lower body 410 is disposed at the lowermost end and is a structure having a constant weight.

Such a load-bearing body 410 is a method of expecting load capacity according to the shear resistance of the main surface of the ground anchor 400 and the soil in the ground.

In addition, the tension member 420 is fixed to the guide bracket 300, and the other side is fixed to the lower body 410 fixed to the ground (G).

The ground anchor 400 is installed vertically or inclined to the opposite side of the thumb pile 100 in the ground (G) on the rear side of the thumb pile 100.

Here, the upper free length portion of the tension member 420 to be fixed to the guide bracket 300 is the first ground anchor so that the upper portion of the tension member 420 can be easily exposed when excavating equipment at the installation height of the wale 200 ( 400) to accurately position the drilling position during vertical drilling, and install the tension member 420 to be fixed to the guide bracket 300 for each excavation stage in a color-painted unbonded form to facilitate confirmation and identification. By fixing to the bracket 300, it is possible to support the deep excavation.

The inclination angle of the ground anchor 400 maintains an angle (0 ° to 20 °) that does not exceed the site boundary based on 0 °.

In the above ground anchor 400, the lower part is fixed to the inner lower body 410 in a state in which tension is introduced into the tension member 420, and the upper part is fixed to the middle part of the wale 200 through the guide bracket 300.

Here, a straight ground activity line (L) of about 20 to 45 ° at the depth of the excavation area can be assumed in the ground (G) around the excavation area where the ground anchor 400 is installed. The lower body 410 of is installed in a deeper position (stable area) than the ground activity line (L).

Accordingly, the tension force of the ground anchor 400 can be stably exerted.

In addition, the ground anchor 400 to which tension is applied is elongated and semicircular fixing pulley upward in a state inclined at a predetermined angle of 0 ° to 20 ° from the ground on the rear side of the thumb pile 100 to the thumb pile 100 or in a vertical state. At 360, it is bent at an obtuse angle, for example, 90° to 110°, and extends toward the middle of the wale 200.

Here, the ground anchor 400 applies a horizontal force to the middle portion of the wale 200 by taking a reaction force in a vertical direction and a reaction force in a horizontal direction to the ground G through the guide bracket 300.

As a result, since the load in the direction of collapsing the thumb pile 100 to the back side ground G acts on the thumb pile 100, the moment and deformation in the direction of collapsing to the excavation area of the thumb pile 100 are alleviated, thereby reducing the thumb pile 100 The collapse to the side of the excavation area is prevented.

The earth retaining facility (P) using the ground anchor equipped with the guide bracket and the lower body according to the present invention having the configuration as described above is installed on the ground (G) on the back side of the thumb pile (100), and , Install the wale 200 on the thumb pile 100, install the guide bracket 300 on the wale 200, and install the tension member 420 of the ground anchor 400 on the guide bracket 300 After that, by applying a load on the rear side of the thumb pile 100 to the middle part of the wale length 200 by tensioning the tension member 420, the thumb pile 100 is formed without installing a separate support material on the excavation side. Not only is there no risk of falling or collapsing into the excavation space, but it can also safely excavate in a narrow space in the city center at low cost.

[Construction method of temporary earth retaining facility]

10 is a construction diagram showing a state of constructing a temporary earth retaining facility using a ground anchor equipped with a guide bracket and a lower body according to the present invention.

As shown in this figure, the method for constructing a temporary earth retaining facility using a ground anchor equipped with a guide bracket and an inner lower body according to the present invention includes thumb piles 100 vertically arranged with a plurality of them at predetermined intervals; A wale 200 disposed across the plurality of thumb piles 100; A guide bracket 300 installed at a predetermined position of the wale; A method of constructing a retaining facility using a guide bracket composed of a ground anchor 400 in which the tension member 420 is wound around the guide bracket 300 and the other side is fixed to the ground G and a ground anchor equipped with a lower body As, forming a plurality of drilling holes by excavating the ground (G) to a certain diameter and depth; Installing a thumb pile 100 in the drilled hole; Installing a ground anchor 400 between the thumb piles 100; Installing a wale 200 to which the guide bracket 300 is attached across the thumb pile 100; Fixing the tension member 420 installed on the ground anchor 400 to the guide bracket 300; It consists of a step of applying a load to the rear side ground (G) in the middle of the wale 200 by tensioning the tension member 420 with a constant tension.

That is, the method for constructing a temporary retaining facility using a ground anchor equipped with a guide bracket and a lower body according to the present invention excavates the ground (G) to a certain diameter and depth by an excavator such as an auger to form a plurality of drilled holes; Installing a thumb pile 100 in the drilled hole; Installing a ground anchor 400 at the rear of the wale 200 between the installed thumb piles 100; Installing a wale 200 to which the guide bracket 300 is attached across the thumb pile 100; Fixing the tension member 420 installed on the ground anchor 400 to the guide bracket 300; Tensing the tension member 420 with a constant tension to apply a load to the ground at the rear side of the middle portion of the wale 200; Install the wale 200 to which the guide brackets 300 are attached for each support step of deep excavation, fix the tension member 420 installed on the plurality of ground anchors 400 to the guide bracket 300, and The load transmitted to the wale 200 is transmitted to the thumb pile 100 by tensioning it with a constant tension to serve as a support, and the support structure of deep excavation is safely formed through a repeated process of applying a load to the ground side of the back of the excavation. .

Here, the ground anchor 400 is installed in the ground (G) at a depth at which the fixing force of the vertical region in the excavation backside site is secured.

Subsequently, a guide bracket 300 is installed on the wale 200 on the outer circumference of the excavation area.

Subsequently, the tension member 420 of the ground anchor 400 is hung on the semi-circular fixing pulley 360 of the guide bracket 300, the semi-circular fixing pulley 360 is fixed, and tension is introduced into the tension member 420. In the state, it is fixed to the middle part of the wale 200 by the anchorage.

That is, the tension member 420 of the ground anchor 400 fixed in the middle of the wale 200 is turned to a horizontal state in the semicircular fixing pulley 360 of the guide bracket 300 installed on the wale 200.

By this, it is possible to install the ground anchor 400 to a deep position in the ground (G) after suppressing the distance in the horizontal direction from the wale 200 of the ground anchor 400.

Therefore, the thumb pile 100 is prevented from collapsing into the excavation area of the thumb pile 100 by applying a horizontal force to the middle part of the wale 200 regardless of the wide narrowing of the ground (G) site on the back side of the thumb pile 100. It is possible to install the ground anchor 400 to prevent.

In addition, by installing the tension member 420 of the ground anchor 400 for connecting the ground anchor 400 to the middle part of the wale 200 on the guide bracket 300 installed in the middle of the wale 200, There is no need to expose the surface of the thumb pile 100.

Therefore, the ground anchor 400 can be installed regardless of before and after excavation in the excavation area.

In addition, as described above, the ground anchor 400 may be inclined to the opposite side of the thumb pile 100 or may be vertical, or the thumb pile 100 itself may be inclined.

On the other hand, the wale 200 is composed of several stages as the depth of excavation deepens, and as the number of stages of the wale 200 increases, the anchoring field of the ground anchor 400 must increase. Accordingly, the diameter of the drilling hole and the anchoring length It should grow and lengthen.

The method for constructing a retaining facility using a ground anchor equipped with a guide bracket and a lower body according to the present invention consisting of the steps as described above excavates the ground (G) to a certain diameter and depth to form a plurality of drilling holes, and the drilling A thumb pile 100 is inserted into the hole, and a vertical ground anchor 400 is installed on the rear side of the wale 200 between the installed thumb piles 100 to form a fixing force, and the thumb pile ( 100) to install the wale 200 to which the guide bracket 300 is attached across the thumb pile 100, and fix the tension member 420 installed on the ground anchor 400 to the guide bracket 300, The tensile member 420 is tensioned with a constant tension, and the load transmitted from the wale 200 is transmitted to the thumb pile 100 to serve as a support, and the guide bracket 300 for each step of deep excavation is attached to the wale 200 is installed, and the tension member 420 installed on the plurality of ground anchors 400 is fixed to the guide bracket 300, and the tension member 420 is tensioned with a constant tension to the back side ground in the middle of the wale 200. The support structure for deep excavation is safely made through the repeated process of applying a load to the excavation, so that there is no risk of the thumb pile 100 falling into the excavation space or collapsing without installing a separate support material on the excavation side. In addition, excavation work can be carried out safely and at low cost even in narrow spaces in urban areas.

Preferred embodiments described in the detailed description of the present invention are illustrative and not limiting, the scope of the present invention is shown by the appended claims, and all modifications that fall within the meaning of those claims do not apply to the present invention. will be included

100: thumb peg 120: web
130: flange 200: wale
300: guide bracket 310: support plate
320: horizontal plate 330: vertical plate
340: left plate 350: right plate
360: fixed pulley 400: ground anchor
410: lower body 420: tension member
G: ground L: ground action line
P: Earth retaining facility using ground anchors equipped with guide brackets and lower bodies

Claims (9)

At predetermined intervals, a plurality of thumb piles 100 vertically arranged;
A wale 200 disposed across the plurality of thumb piles 100;
a guide bracket 300 installed at a predetermined position of the wale 200;
Earth retaining facility using a ground anchor with a guide bracket and a lower body, characterized in that the ground anchor 400 is fixed to the ground (G) while the tension member 420 is wound around the guide bracket 300 and the other side is fixed to the ground (G) . According to claim 1,
The thumb pile (100 is a retaining facility using a ground anchor equipped with a guide bracket and a lower body, characterized in that it is composed of any one of a section steel and a steel pipe. According to claim 1,
The wale 100 is a retaining facility using a ground anchor equipped with a guide bracket and a lower body, characterized in that composed of any one of a section steel and a steel pipe. According to claim 1,
The guide bracket 300 includes a support plate 310 having a certain thickness and width; horizontal plates 320 extending at right angles from both ends of the support plate 310 at regular intervals; vertical plates 330 extending downwardly at right angles to the horizontal plates 320; Characterized in that it consists of the left and right plates 340 and 350 welded across the vertical plates 330 and the semicircular fixing pulley 360 coupled between the left and right plates 340 and 350 A temporary retaining facility using a ground anchor equipped with a guide bracket and a load-bearing body. According to claim 1,
The ground anchor 400 includes a lower body 410 having a constant weight disposed at the lower end; An earth retaining facility using a ground anchor equipped with a guide bracket and an inner lower body, characterized in that it consists of a tension member 420 in which one side is embedded in the lower body 410 and a certain length is pulled out to the other side. At predetermined intervals, a plurality of thumb piles 100 vertically arranged;
A wale 200 disposed across the plurality of thumb piles 100;
A guide bracket 300 installed at a predetermined position of the wale;
A method of constructing a retaining facility using a guide bracket composed of a ground anchor 400 in which the tension member 420 is wound around the guide bracket 300 and the other side is fixed to the ground G and a ground anchor equipped with a lower body As,
Forming a plurality of drilling holes by excavating the ground (G) to a certain diameter and depth;
Installing a thumb pile 100 in the drilled hole;
Installing a ground anchor 400 between the thumb piles 100;
Installing a wale 200 to which the guide bracket 300 is attached across the thumb pile 100;
Fixing the tension member 420 installed on the ground anchor 400 to the guide bracket 300;
Earth retaining using a ground anchor equipped with a guide bracket and a lower body, characterized in that the step of applying a load to the back side ground (G) at the middle of the wale (200) by tensioning the tension member (420) with a constant tension Temporary facility construction method. According to claim 6,
Earth retaining facility construction method using a ground anchor equipped with a guide bracket and a lower body, characterized in that the ground anchor 400 is installed vertically in the same direction as the thumb pile 100. According to claim 6 or 7,
The ground anchor 400 is installed at a position deeper than the ground activity line (L) of the back side ground (G) of the thumb pile (100) Earth retaining facility using a ground anchor equipped with a guide bracket and a lower body construction method. According to claim 6,
The wale 200 is composed of several stages as the depth of excavation deepens, and as the number of stages of the wale 200 increases, the diameter and length of the anchorage of the ground anchor 400 become larger and longer. A method of constructing a retaining facility using a ground anchor equipped with a lower body.

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