KR20200124579A - Method of manufacturing support beam for retaining wall and support beam for retaining wall using the same - Google Patents

Abstract

The present invention relates to a method for manufacturing a support beam for an earth retaining wall and a support beam for an earth retaining wall using the same, wherein the method for manufacturing a support beam for an earth retaining wall can introduce prestress in an opposite direction of a direction to which earth pressure is applied, manufacture two support beams at the same time to lower a manufacturing cost, and form at least two bending moment portions since earth pressure is relatively greatly applied in case of the support beam in a range of 10 to 20 m used in deep excavation and the earth pressure cannot be applied by the single bending moment.

Description

Manufacturing method of support beam for retaining wall and support beam for retaining wall using the same {METHOD OF MANUFACTURING SUPPORT BEAM FOR RETAINING WALL AND SUPPORT BEAM FOR RETAINING WALL USING THE SAME}

The present invention relates to a method of manufacturing a support beam for a retaining wall and a support beam for a retaining wall using the same, and more particularly, to allow the prestress to be introduced in a direction opposite to the direction in which earth pressure acts, but the support beams of two are simultaneously Not only can the manufacturing cost be lowered by manufacturing, but in the case of a support beam in the range of 10m to 20m used for deep excavation, the earth pressure is relatively large, and it cannot be applied in a single bending moment region, so at least two The present invention relates to a method of manufacturing a support beam for a retaining wall having the above bending moment region, and a support beam for a retaining wall using the same.

In the case of excavation by extending the ground in a predetermined depth and length direction such as a conventional building, open tunnel, subway, power outlet, communication port, sewage pipe, etc., and installing a structure in the space inside the excavated ground, the excavated ground surface is always It is about to collapse by earth pressure.

Therefore, in general, a support beam (H-beam) is first buried in the ground, and then an earth plate is inserted between the support beams while excavating the ground.

At this time, a horizontal beam-shaped strip is installed on the support beam on which the earth plate is installed, which connects the support beams in a horizontal direction so that the support beam and the strip can more effectively resist the main earth pressure acting as a grid-shaped structure. It is to do.

In recent years, in order to simplify the construction, a pre-stress is introduced into the support beam itself without separate strips and support beams, and a "thumb pile with pre-stress introduced and a self-supporting temporary soil barrier construction method using the same (Republic of Korea Patent Registration No. 1609805): It is referred to as a cited invention."

The above cited invention was constructed by installing a tension member made of a steel bar on the side of the thumb pile to introduce prestress.

However, such a cited invention has a problem in that it is difficult to manufacture, resulting in a decrease in productivity, a very high price, and a large construction cost.

Korean Patent Registration No. 1609805

The present invention has been conceived in consideration of the above problems, and the first object of the present invention is to simultaneously manufacture two support beams with prestress introduced, and support for a retaining wall that is easy to manufacture in the field due to its simple structure. It is to provide a method of manufacturing a beam and a support beam for an earthen wall using the same.

The second object of the present invention is to minimize plastic deformation by using concrete, thereby minimizing the curved section to achieve a horizontal state, thereby facilitating the installation of the earth plate, and maximizing prestress by the filled concrete. It is to provide a method of manufacturing a support beam for a retaining wall that can be secured and installed independently without a separate support beam, and a support beam for a retaining wall using the same.

A third object of the present invention is that in the case of a support beam in the range of 10m to 20m used for deep excavation, the earth pressure is relatively large, and it cannot be applied to a single bending moment region, so at least two bending moments Method of manufacturing support beam for retaining wall with area and support beam for retaining wall using the same

According to the features for achieving the above object, the first invention relates to a method of manufacturing a support beam for a retaining wall fixed to the ground to support the earth panel of the retaining wall, and for this purpose, a pair of Preparing a support beam; (S10) and inserting a lower region of each support beam inserted into the ground at a predetermined interval into a single fixing jig and fixing it upright; (S20), and a bending moment at each of the support beams A step of simultaneously applying a tensile force by attaching a tensioning means between the support beams so that a bending moment is generated; (S30) and injecting high-strength concrete into the inside of each of the support beams in which a bending moment is generated; Curing high-strength concrete to introduce the compressed residual prestress into the concrete filled in each of the support beams; (S50) and the retaining wall to which the prestress is introduced after dismantling each of the support beams from a tensioning means and a fixing jig Completing the support beam for; (S60) is configured to include, wherein the support beam for the retaining wall is installed to generate a bending moment in a direction opposite to the direction in which the earth pressure acts.

In the second invention, in the first invention, the tensioning means of the step S30 is any one selected from a tensioning jack or a tensioner using a steel wire, and the tensioning means applies a tensile force below an extreme bending moment to prevent plastic deformation. It features.

In the third invention, in the first invention, the step S30 is a step of dividing a portion to which a bending moment is applied to each support beam, and then marking the divided point with a pen; (S31) and a plurality of the marked portions Mounting the tensioning means of; (S32), and applying a tensile force to each of the tensioning means, wherein the tensioning means mounted at a point where the earth pressure of each of the tensioning means is large applies a tensile force below the ultimate bending moment of the support beam, The tensioning means mounted at the point where the earth pressure is relatively weak applies a relatively small tensioning force; (S33) is characterized in that it further comprises.

In the fourth invention, in the first invention, the step S30 is a step of dividing each support beam in a longitudinal direction and marking; (S31), a plurality of tensioning means and a support neck or a fixing jig are alternately alternating with each other at the marked portion. (S32) and applying a tensile force to each of the tensioning means to form a section with at least two bending moments on each of the support beams; (S33).

In the fifth invention, in the first invention or the third invention, after the step S60, further connecting a separate extension beam using a coupler to the upper part of the support beam for the retaining wall; (S70) is further included. To do.

In the sixth invention, in the first invention, the step S20 further comprises a step of further installing an auxiliary jig or reaction force means coupled to a lower end of each support beam at a lower portion of the fixing jig; (S21) .

According to the features for achieving the above object, the seventh invention relates to a support beam for a retaining wall using a method of manufacturing a support beam for a retaining wall, and the retaining wall of any one of the first to sixth inventions It is characterized by using a method of manufacturing a support beam for.

According to the method of manufacturing a support beam for a retaining wall according to the present invention and a support beam for a retaining wall using the same, two support beams into which prestress is introduced can be simultaneously manufactured, and since the manufacturing is simple, there is an effect that it is easy to manufacture in the field. .

In addition, there is an effect applicable to support beams in the range of 10m to 20m used for deep excavation through the support beam for the earthen wall, which has at least two bending moment regions formed.

In addition, since the filled concrete has prestress, it is possible to minimize the plastic deformation of the support beam, and accordingly, it is possible to achieve a horizontal state by minimizing the curved section, so that the installation of the earth plate is easy.

In addition, there is an effect that the prestress can be secured as much as possible by the filled concrete and can be installed independently without a separate support.

In addition, in order to introduce pre-stress, there is an effect that the manufacturing cost is cheaper than the structure in which the steel wire is mounted on the side of the support beam.

1 is a flow chart showing a method of manufacturing a support beam for a retaining wall according to a first embodiment of the present invention;
2 is a detailed flowchart showing step S30 of FIG. 1;
3 is a configuration diagram showing step S30 of FIG. 1;
Figure 4 is a perspective view showing a support beam for the retaining wall showing step S60 of Figure 1,
5 is a configuration diagram showing a support beam for a retaining wall representing step S70 of FIG. 1,
6 is a flow chart showing a method of manufacturing a support beam for a retaining wall according to a second embodiment of the present invention;
7 is a detailed flow chart showing step S30 of FIG. 6;
FIG. 8 is a configuration diagram illustrating step S30 of FIG. 6.

The following objects, other objects, features, and advantages of the present invention will be easily understood through the following preferred embodiments related to the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms.

Rather, the embodiments introduced herein are provided so that the disclosed content may be thorough and complete, and the spirit of the present invention may be sufficiently conveyed to those skilled in the art.

The embodiments described and illustrated herein also include complementary embodiments thereof.

In this specification, the singular form also includes the plural form unless specifically stated in the phrase. As used in the specification, "comprise" and/or "comprising" does not exclude the presence or addition of one or more other components.

Hereinafter, the present invention will be described in detail with reference to the drawings. In describing the specific embodiments below, various specific contents have been prepared to more specifically describe the invention and to aid understanding. However, readers who have knowledge in this field enough to understand the present invention can recognize that it can be used without these various specific contents. In some instances, it should be noted in advance that parts that are commonly known in describing the invention and are not significantly related to the invention are not described in order to avoid confusion in describing the invention.

1 is a flow chart showing a method of manufacturing a support beam for a retaining wall according to a first embodiment of the present invention, FIG. 2 is a detailed flowchart showing step S30 of FIG. 1, and FIG. 3 is a configuration showing step S30 of FIG. FIG. 4 is a perspective view showing a support beam for a retaining wall representing step S60 of FIG. 1, and FIG. 5 is a configuration diagram showing a support beam for a retaining wall representing step S70 of FIG. 1.

As shown in Figs. 1 to 5, the first embodiment of the present invention allows prestress to be introduced in a direction opposite to the direction in which earth pressure acts, but to reduce the manufacturing cost by simultaneously manufacturing two support beams. It relates to a method of manufacturing a support beam for a retaining wall.

First, in step S10, a pair of support beams 10 having a hollow inside are prepared.

In this case, the support beam 10 may have a rectangular cross section or a circular cross section, and may be manufactured in a polygonal shape such as a triangle or a pentagon.

The support beam 10 may form a cone-shaped insertion portion 11 at a fixed end inserted into the ground.

In addition, a plurality of through holes 12 for discharging air when concrete is injected may be formed around the insert 11.

In addition, the support beam 10 may form a spline-shaped rib (not shown) protruding in the center direction or reinforced reinforcing bars (not shown) on the four inner sides to reinforce tensile force and rigidity.

In step S20, the lower region of each support beam 10 inserted into the ground is inserted into a single fixing jig 40 at regular intervals and fixed upright.

Here, a variety of means other than the fixing jig 40 can be used instead, but a means for easy disassembly is required.

In the above, the fixing jig 40 is provided with an insertion hole capable of guiding the two support beams, and the insertion hole is required to have a size capable of securing a clearance with the support beam 10.

This is achieved by further installing an auxiliary jig 41 or a reaction force unit coupled to the lower end of each support beam 10 at the lower part of the fixing jig 40 (S21), and the support beam 10 This is to allow the generated reaction force to be generated at the lower end of the ), thereby generating a bending moment in the reverse direction in the lower region of the fixing jig 40.

Therefore, each support beam 10 inserted into the ground may also be prestressed.

In the case of using the reaction force in the above, a tensioner using the same load jack or stress wire as the tensioning means described later may be used.

In step S30, a tensile force may be simultaneously applied by mounting a tensioning means 30 between the support beams 10 so that a bending moment is generated in each of the support beams 10.

At this time, it should be preceded that each of the support beams 10 is aligned with the horizontal level to have the same height with each other.

And the tensioning means 30 is any one selected from a tensioner using a tension jack or a stress wire, and the tensioning means 30 applies a tensile force below an extreme bending moment to prevent plastic deformation, so that each of the support beams 10 ) Can be secured as much as possible.

Meanwhile, in step S30, at least two or more tensioning means 30 may be installed in order to disperse the bending moment according to the rigidity of the support beam 10 or the length of the support beam 10.

For this, first, each support beam 10 divides a portion to which the bending moment is applied, and then marks the divided point with a pen (S31).

In addition, the tensioning means 30 may be mounted on the marked portion (S32), and thereafter, a tensile force may be applied to the support beam 10 through the respective tensioning means 30.

The tensioning means 30 mounted at the point where the earth pressure is high among the respective tensioning means 30 applies a tensile force below the ultimate bending moment of the support beam 10, and the tensioning means 30 mounted at a point where the earth pressure is relatively weak. ) Is desirable to apply a relatively small tensile force (S33)

In this case, a normalized bending moment may be provided by connecting the load cell 31 to the tensioning means 30.

In step S40, high-strength concrete 14 is injected into the inside of each of the support beams 10 in which a bending moment is generated.

The high-strength concrete 14 is for preserving the introduced prestress even if the tensile force of the tensioning means 30 is dismantled together with the tensile force of the support beam 10 made of a metal material.

Here, since each of the support beams 10 is installed upright, concrete is supplied through the open upper portion, and the concrete 14 is poured to the lower portion of the support beam 10 by its own weight.

In step S50, the high-strength concrete 14 is cured to introduce the compressed residual prestress into the concrete 14 filled in each of the support beams 10.

Here, when the tensile force of the tensioning means 30 is removed, the concrete 14 is compressed by the elastic deformation of the support beam 10 (the force to return to its original state), and the compressed concrete 14 is the state that the residual prestress has. The furnace is filled in the support beam 10.

In more detail, when the tensile force is removed, the support beam 10 is restored to its original shape by about 50% to 60% by elastic deformation, and about 50% of the tensile force is preserved in the concrete 14 in the form of residual prestress.

Accordingly, the support beam 10 into which the pre-stress is introduced is in a horizontal state by substantially minimizing a curved section, thereby facilitating installation of the earth plate.

In step S60, each of the support beams 10 is disassembled from the tensioning means 30, the fixing jig 40, and the auxiliary jig 41 to complete the support beam 100 for the prestressed wall.

The support beam 10 for the earthing wall manufactured in this way is installed in a direction opposite to the direction in which the earth pressure acts.

On the other hand, if the length of the support beam 100 for a retaining wall of the present invention is required in the range of 10 m to 20 m, after the step S50, a separate coupler 15 is used on the upper part of the support beam 100 for a retaining wall. A step (S60) of further connecting the extension beams 20 may be further included.

When the extension beam 20 is not subjected to a large earth pressure, a general support beam 10 may be used, and a support beam manufactured through the above-described steps may be optionally used.

The support beam 10 for the earth retaining wall using the method of manufacturing the support beam for the earth retaining wall described above is installed in a direction opposite to the direction in which the earth pressure acts.

The method of manufacturing a support beam for a retaining wall of the present invention and a support beam for a retaining wall using the same have the following distinctive features.

First: In order to introduce the conventional prestress, it has a feature of lower manufacturing cost than a structure in which a steel wire is mounted on the side of the support beam.

Second: It is characterized by a simple manufacturing method that enables on-site manufacturing.

Third: It has the characteristic that it can be installed independently without a separate support or belt by securing the prestress as much as possible by the filled concrete.

Fourth: It has the characteristic that it can improve productivity as well as price by simultaneously manufacturing two prestressed filling support beams.

Fifth: The support beam for the earthen wall has a feature that can facilitate installation of the earth plate by maintaining the horizontal state as much as possible without a curved section.

6 is a flow chart showing a method of manufacturing a support beam for a retaining wall according to a second embodiment of the present invention, FIG. 7 is a detailed flowchart showing step S30 of FIG. 6, and FIG. 8 is a diagram showing step S30 of FIG. It is a configuration diagram.

As shown in Figs. 6 to 8, the second embodiment includes the first embodiment, but in the case of the support beam in the range of 10m to 20m used for deep excavation, the earth pressure acts relatively large. Since it cannot be applied to the bending moment region of, it relates to a method of manufacturing a support beam 100 for a retaining wall in which at least two bending moment regions are formed.

To this end, step S30 is a step of dividing each support beam 10 into equal parts in the longitudinal direction and marking; (S31), a plurality of tensioning means 30 and a support 50 or a fixing jig are alternately alternating with each other at the marked portion. (S32), and applying a tensile force to each of the tensioning means (30) to form a section with at least two bending moments to each of the support beams (10); (S33) do.

In the step S32, the support 50 may be mounted or a fixing jig or reaction force means may be mounted to fix the markings marked at points between the bending moment sections so that reaction force is generated.

Further, the tensioning means 30 are respectively installed on the markings marked in the bending moment point area.

Further, in step S33, a tensile force is applied to each of the tensioning means 30 so that at least two or more bending moments are generated in each of the support beams 10, so that prestress can be secured as much as possible in multiple stages.

The second embodiment, unlike the first embodiment, has a feature of being simple to manufacture because it does not require a separate extension beam to be connected by introducing pre-stress to one support beam 10 in multiple stages.

As described above, it goes without saying that the method of manufacturing a support beam for a retaining wall of the present invention and a support beam for a retaining wall using the same can be used as a strip.

Since the embodiments described in this specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention and do not represent all the technical spirit of the present invention, various equivalents that can replace them at the time of application And it should be understood that there may be variations.

10: support beam 11: insertion part 12: through hole
14: concrete 15: coupler
20: extended beam
30: tensioning means 31: load cell
40: fixed jig 41: auxiliary jig
50: support
100: support beam for earthing wall

Claims (7)

In the method of manufacturing a support beam for a retaining wall that is fixed in the ground to support the earth panel of the retaining wall,
Preparing a pair of support beams 10 with a hollow inside; (S10)
Inserting a lower region of each support beam 10 inserted into the ground at a predetermined interval into a single fixing jig 40 and fixing it upright; (S20)
A step of simultaneously applying a tensile force by attaching a tensioning means 30 between each of the support beams 10 so that a bending moment is generated in each of the support beams 10; (S30)
Injecting high-strength concrete into the inside of each of the support beams in which a bending moment is generated; (S40)
Curing the high-strength concrete 14 to introduce the compressed residual prestress into the concrete 14 filled in each of the support beams 10; (S50) and
Completing the support beam 100 for the pre-stressed prestressing wall after disassembling each of the support beams 10 from the tensioning means 30 and the fixing jig 40; (S60), including,
The method of manufacturing a support beam for a retaining wall, characterized in that the support beam for the retaining wall is installed to generate a bending moment in a direction opposite to the direction in which the earth pressure acts.
The method of claim 1,
The tensioning means 30 of the step S30 is any one selected from a tensioning jack or a tensioner using a steel wire,
The tensioning means (30) is a method of manufacturing a support beam for a retaining wall, characterized in that applying a tensile force below an extreme bending moment to prevent plastic deformation.
The method of claim 1,
The step S30 is a step of dividing a portion to which a bending moment is applied to each support beam 10, and then marking the divided point with a pen; (S31) and,
Mounting a plurality of tensioning means on the marked portion; (S32) and,
The tensioning force is applied to each of the tensioning means, but the tensioning means 30 mounted at a point where the earth pressure is high among the tensioning means 30 applies a tensile force less than the ultimate bending moment of the support beam 10, and a relatively earth pressure The tensioning means 30 mounted at the weak point is a step of applying a relatively small tensile force; (S33) a method of manufacturing a support beam for a retaining wall, characterized in that it further comprises.
The method of claim 1,
The step S30 is a step of dividing each support beam 10 in the longitudinal direction and marking; (S31), a plurality of tensioning means 30 and a support 50 or a fixing jig are alternately alternated with each other at the marked portion Mounting; (S32), and applying a tensile force to each of the tensioning means (30) to form a section of at least two or more bending moments to each of the support beams (10); (S33) characterized by further comprising Method of manufacturing a support beam for a wall covering the earth.
The method of claim 1 or 3,
After the step S60, further connecting a separate extension beam 20 using a coupler 15 to the upper part of the support beam for the retaining wall; (S70) of the support beam for the retaining wall, characterized in that it further comprises Manufacturing method.
The method of claim 1,
The step S20 is a step of further installing an auxiliary jig 41 or a reaction force unit coupled to the lower end of each support beam 10 at a lower portion of the fixing jig 40; (S21) Method of manufacturing support beam for wall.
A support beam for a retaining wall using the method of manufacturing a support beam for a retaining wall according to any one of claims 1 to 6.

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