KR20040017387A - Grid fixing device for constructing of mechanically stabilized earth walls and reinforced soil slopes and construct method of existing banking area and cutting area using the device - Google Patents

Abstract

PURPOSE: A grid-fixing unit for construction of mechanically stabilized earth walls and reinforced soil slopes and a construction method in a banking area and a cutting area using the grid-fixing unit are provided to construct the mechanically stabilized earth walls and reinforced soil slopes by applying a grid even when the securing of the reinforcing length of the grid is impossible. CONSTITUTION: A grid-fixing unit for construction of mechanically stabilized earth walls and reinforced soil slopes includes plural fixing bars(30) having drawing resistance force; reinforcing bars(40) combined to the fixing bars to connect the fixing bars at a predetermined height from the ground(10); and a grid(50). One end of the fixing bar is inserted into the ground of a banking area or a cutting area for constructing the mechanically stabilized earth walls and reinforced soil slopes, and the other end of the fixing bar is projected onto the ground. The end of the grid positioned to banked subsoil of the banking area or the cutting area is wound around the reinforcing bar and fixed.

Description

GRID FIXING DEVICE FOR CONSTRUCTING OF MECHANICALLY STABILIZED EARTH WALLS AND REINFORCED SOIL SLOPES AND CONSTRUCT METHOD OF EXISTING BANKING AREA AND CUTTING AREA USING THE DEVICE}

The present invention relates to a grid fixing mechanism for the construction of reinforcement soil retaining wall and reinforcement slope, and to the construction method of (existing) fill portion and cut portion using the same, more specifically, when the ground state of the slope is poor or the cut area should be reduced. It also relates to a grid fixing mechanism for the construction of the reinforcement soil retaining wall and reinforcement slope to be applied by applying the grid, and the construction method (existing) fill and cut section using the same.

The reinforcement soil method using reinforcement (backfill) has largely mechanically stabilized earth walls (MSEW) and reinforced soil slopes (RSS). Reinforcement soil retaining wall is a method of installing the reinforcement grid 14 in the form of the construction as shown in Figure 1 to finish the various concrete surfaces on the compacted ground, the reinforcement slope is as shown in Figure 2 Filler requirements are somewhat less stringent than reinforced earth retaining walls, and can worsen slopes up to 70 °. Generally, when the slope is more than 45 °, it is constructed by winding the grid.

Referring to FIGS. 1 and 2, the reinforcement soil retaining wall has a ground layer 10 in its natural state, a soil layer 12 filled in the cut surface of the ground 10, and a block layer (or panel layer) stacked on the front surface. It consists of (16), the reinforcement slope consists of the ground 10 and the soil layer (12). The grid 14 used here is the same term as the reinforcing material or ground reinforcing material. For example, the special material sales company sells it under the trade name "Tensar Giogrid". The grid 14 has a network structure made of high density polyethylene (HDPE) and is horizontally installed inside the soil layer 12. The use of such a grid (14) has various advantages such as not only structural stability, but also to recycle the excavated soil in the construction site, and it is possible to shorten the air to proceed with the ground work at the same time as the construction of the block layer.

The grid 14 is very important for the construction of safe reinforced retaining walls and compensating slopes. In particular, the reinforcement length of the grid is different depending on the conditions, but the design criteria, etc., maintain about 0.7 times the height of the retaining wall in the reinforced earth retaining wall, and the reinforcement slope is determined by the safety review and is made as long as possible.

However, when the reinforcement length (L) of the grid cannot be secured or the existing cut part that has to be constructed while minimizing the cut area, or the cut part that reduces the cut area in order to reduce the natural damage, the grid is used. There is a problem that can not be installed.

The present invention has been made to solve the above problems, and its object is to provide a new type of reinforcement soil retaining wall and reinforcement to apply the grid even when the reinforcement length of the grid cannot be secured and when the cut area is difficult to increase. It is to provide a grid fixing mechanism for the construction of the slope and the construction method of the fill section and cut section using the same.

1 shows an example of a reinforced earth retaining wall constructed using a grid;

2 shows an example of a reinforcement slope constructed using a grid;

3 is a view for explaining a case of constructing a structure by additionally filling the existing fill portion;

4 is a view for explaining a grid fixing mechanism according to a preferred embodiment of the present invention;

FIG. 5 is a plan view illustrating a state in which a reinforcing bar reinforcing bar is coupled to a lock bolt or a soy nail in FIG. 4;

6 is a cross-sectional view taken along line 6-6 in FIG. 5;

7 is a cross-sectional view taken along line 7-7 in FIG. 5;

Figure 8a is a view showing a coupling form of another example of the fixed bar and the reinforcement bar in a preferred embodiment of the present invention;

Figure 8b is a view showing the coupling form of the reinforcing bar using another connection method of the fixing bar in a preferred embodiment of the present invention;

9 is a plan view showing in detail the coupling state of the reinforcing bar and the grid;

10 is a view sequentially showing a construction method of a general reinforced earth retaining wall;

11 is a flow chart showing the main process of the example of applying the construction method using the grid fixing mechanism according to the present invention to the construction method of FIG.

12 is a view showing an example of a reinforcement soil retaining wall constructed in the cut portion according to the construction method of the present invention;

13 is a view showing the construction method of the general reinforcement slope in sequence;

14 is a view showing an example of the reinforcement slopes constructed in the (existing) fill portion according to the construction method of the present invention.

Explanation of symbols on the main parts of the drawings

10: ground, existing fill part 12: backfill soil

14, 50 grid 16: block layer

20: grid fixing mechanism 30: fixing bar

40: reinforcing bar 60: connecting bar

According to a feature of the present invention for achieving the above object, the present invention can be applied to the reinforcement soil retaining wall and reinforcing slopes by applying the grid even when the reinforcement length of the grid can not be secured and the cut area is difficult to increase To provide a grid fixture. The grid fixing mechanism includes a fixing bar, a reinforcing bar and a grid. The fixed bar has a pull-out resistance, and is installed in a plurality of grounds or existing cut section for constructing the reinforcement soil retaining wall and the reinforcement slope. The reinforcing bar connects and couples a plurality of fixed bars at a constant height from the ground (the position where each grid is laid). The grid is installed on the backfill or underfill soil layer in the fill or cut section, and its ends are fixed by winding on the reinforcement bar.

Thus, in the grid fixing mechanism according to claim 1 of the present invention, the grid can be fixed by inserting the connecting bar positioned on the other side of the grid at the end in a state in which the grid is wound from one side of the reinforcement bar to the other side and extended in the opposite direction. have.

As described above, in the grid fixing mechanism according to claim 1 or 2 of the present invention, the reinforcing bar is provided with one or more bars spaced apart from each other in the longitudinal direction of the fixing bar, and when using two or more, a plurality of gap adjusting pieces are fixed therebetween. Can be installed at intervals.

As described above, in the grid fixing mechanism according to claim 1 or 2 of the present invention, the fixing bar has an end portion formed by bending a 'U' shape protruding over the construction ground, and the reinforcing bar is inserted into the end of the end. It can be coupled to the fixed bar.

According to another feature of the present invention for achieving the above object, the present invention is a plurality of reinforcement soil retaining wall and the reinforcement slope using the grid fixing mechanism to have a pull-out resistance at a predetermined position of the ground of the existing fill section or cut section Installing a fixed bar; Tofu processing a grid avoiding a portion that interferes with the fixing bar; Fixing and reinforcing bars to the plurality of fixing bars; Winding the end of the grid to the reinforcing bar is fixed.

As described above, the step of fixing the grid to the reinforcing bar in the construction method of the (existing) fill part and the cut part using the grid fixing device according to the present invention includes winding the grid to the reinforcing bar and using two connecting bars. It may comprise the step of connecting.

Reinforced soil retaining wall and reinforcement slope construction method can be divided into two types according to the terrain. In other words, it can be divided into the case of construction in the filling section (fill section) and the case in the section of cutting section (cut section). It can be divided into building structure by filling with. In general, the construction of reinforcement retaining walls or reinforcement slopes of new fillets can be constructed without being limited by the installation length of the grid. However, as shown in FIG. 3, when building the structure by additionally filling the existing fill part 10, the length of the fill part 12 to be expanded (newly constructed) should be secured to ensure the stability. The longer the value, the worse the economic feasibility (for example, it is almost impossible to secure a stable length of landfill due to the high land price in the city center). In addition, if you want to reduce the length of the fill section 12, the construction should be applied by applying a grid, in this case (12 ') to increase the cut area (A) of the existing fill section 10 in order to secure a stable grid length There is a problem that must restrict traffic such as roads.

On the other hand, the present invention provides a grid fixing mechanism and a construction method using the same for reinforcing soil retaining wall or reinforcing slope even when the length of installation of the grid cannot be secured and when it is difficult to increase the cut area. In addition, the present invention can not increase the cut area due to workability, environmental problems, etc. when it is necessary to construct reinforcement earth retaining wall and reinforcement slope on the slope of rock wall or steep slopes, but the reinforcement earth retaining wall with small cut area And reinforcement slopes. According to the present invention, it is possible to construct using the grid while minimizing the cut area and to improve the economics and convenience of the construction by enabling the construction using the grid even in the (existing) fill section that cannot secure the length of the grid sufficiently. And shorten the air. In addition, it is possible to construct eco-friendly structures by minimizing cutting amount, and has an effect of reducing construction costs.

Hereinafter, the grid fixing mechanism for the construction of the reinforcement soil retaining wall and the reinforcement slope according to the present invention will be described in detail with reference to the accompanying drawings 4 to 9, and (conventional) the fill section and the cut section using the grid fixing mechanism are attached. 10 to 14 will be described in detail. In this case, the same reference numerals are given to the components that perform the same functions in FIGS. 1 to 14, and the components for connecting, coupling, and fixing the main elements are briefly or omitted in each drawing. From the construction of the reinforcement slope and the illustration of the components that can be basically applied by those skilled in the art, the illustration is centered on the parts related to the present invention. In particular, there are parts in which the size ratio between the elements is somewhat different or the sizes between the components coupled to each other are different. However, the representation difference in the drawings is easily understood by those skilled in the art. A separate description is omitted.

4 to 9 are views for explaining a grid fixing mechanism according to a preferred embodiment of the present invention.

4 to 9, the grid fixing mechanism 20 according to the preferred embodiment of the present invention is composed of a fixing bar 30, a reinforcing bar 40 and the grid 50, and the like. The fixing bar 30 is installed so that one end is inserted into the ground 10 of the fill portion or cut portion for laying the grid 50 and the other end protrudes over the ground 10 by a lazy or grouting or mechanical fixing method. It is processed to have a pulling resistance. The fixing bar 30 may be a soy nail or a rock bolt fixed by grout such as cement or mortar by grouting, or by mechanical fastening by mechanical fixing. It may be a bolt or the like, there is no limitation on the fixing method and shape. In addition, the fixing bar 30 may be used as a general steel bar or reinforcing bar, but the material is not limited and can be used within the design value, the installation position may be arbitrarily designed according to the ground conditions (possible constant Installation at intervals will be easier to install the reinforcement bar later to fix the grid). For reference, in the present embodiment, the grouting method was applied, and the rebar was applied as the fixing bar 30. The reinforcing bar 40 is to adjust the size and material according to the tensile force applied to the grid can be used, such as reinforcing bars, H-beams, steel pipes, fiber glass rods, etc. In the embodiment of the present invention D32 And SD40 rebar were applied. In addition, the grid 50 may use various types of reinforcement materials used in this field, and in the embodiment of the present invention, a high density polyethylene (HDPE) integrated grid (trade name: Tensar Giogrid) was used.

Meanwhile, in the preferred embodiment of the present invention, all the reinforcing bars used epoxy-coated reinforcing bars, and, if necessary, the reinforcing bars were covered with mortar or concrete. Since the reinforcing welding part is damaged by epoxy coating, the welding part is retreated with heavy coating T / U green paint or more effective material such as epoxy coating for rust prevention treatment. The reinforcement bar was installed to be longitudinally continuous for moment distribution. In addition, after the grid was tensioned by the earth pressure for close contact with the grid connection part, the landfill material was laid and compacted.

4 and 5, the grid fixing device 20 according to the preferred embodiment of the present invention includes a fixing bar 30, a reinforcing bar 40, and a grid 50. The fixed bar 30 is processed to have a pull-out resistance by grouting after one end is inserted into the ground 10, and the other end is installed to protrude a predetermined length over the ground 10. At least one reinforcing bar 40 for fixing the grid 50 is welded and fixed to the fixing bar 30. As described above, a variety of kinds of reinforcing bars 40 may be used. In this embodiment, two reinforcing bars 42 and 44 are used, and as shown in FIG. 6, the reinforcing bars 40 are spaced apart from each other in the longitudinal direction of the fixing bar 30. It was fixed to the fixed bar 30 so as to install a plurality of gap adjusting pieces 46 are cut at regular intervals between the reinforcing bars in a certain length. This gap adjusting piece 46 is welded and fixed to each of the rebars 42 and 44 so as to support and connect the two rebars 42 and 44 as shown in FIG. And if necessary, after welding, anti-corrosion treatment with epoxy coating.

Meanwhile, as shown in FIG. 8A, a portion protruding over the ground 10 is bent in a 'U' shape to use a fixing bar 30 ′ having an end 33 formed thereon. This fixing bar 30 'is a kind of soy nail or lock bolt used in the grouting method. In the case of using the fixing bar 30 ', the two reinforcing bars 42' and 44 'in the aforementioned reinforcing bar 40 need not be welded to the fixing bar 30' and have a 'U' shaped end 33 ), There is an advantage that can be fixed by inserting. In addition, as shown in Figure 8b by using a fixed bar (30 ") of the form of the turnbuckle (turnbuckle) coupled to the end of the soil nail or rock bolt nailed to the ground (10) of the soil nail or rock bolt on the ground (10) The installation of the grid can be facilitated by adjusting the errors generated during the work.

As shown in FIGS. 4 and 9, the ends of the grid 50 located on the ground 10 are wound and fixed to the reinforcement bar 40 installed as described above. In other words, the grid 50 is wound from one side 52 of the reinforcement bar 40 to the other side 54 and extends in the opposite direction, so that the connecting bar 60 located on the other side 56 of the grid 50 is It is fixed by being inserted into the end 58. The configuration of connecting the grid 50 to the connection bar 60 as described above is a very useful method even when using two grids connected to each other. In other words, one grid is wound around the reinforcing bar 40 so that it can be extended by connecting with another grid in a fixed state.

10 is a view showing a construction method of the general reinforced earth retaining wall in sequence, Figure 11 is a flow chart showing the main process of the example of applying the construction method using the grid fixing mechanism according to the present invention, Figure 12 is a construction method of the present invention The figure shows an example of the reinforcement earth retaining wall constructed in the cut section.

As shown in FIG. 11, the method of constructing the reinforcement soil retaining wall using the grid fixing mechanism according to the preferred embodiment of the present invention includes the base bottom selection and the first stacking and back filling (S500) and the fixing bar installation (S510). , Grid installation and tofu treatment (S520), after the installation of the reinforcement bar fixed grid to the reinforcement bar (S530), the grid fixed to the block (S540), the top block stacking, backfilling and back ground fill (S550) . In some cases, the cut bar is first constructed at a height where the grid is installed, and the first step of stacking and backfilling, grid laying and tofu treatment, top block stacking, backfilling, and backing soil are formed.

Such a method is to mix the process for installing the grid fixing mechanism of the present invention in the construction method of the general reinforced earth retaining wall as shown in FIG.

Referring to Figure 10, in the general construction method of reinforcement earth retaining wall step (S500, a) to select the ground (base 10, the base bottom) and to build the first block 16 to form a trench in accordance with the designed depth and foundation thickness After cutting, the foundation surface is 15mm thick and has good drainage soil (sand or gravel 13mm ~ 25mm crushed stone) by standard compaction method by 90% to 95% or more. Proceed. The block used in this embodiment is a product having the trade name 'KEYSTONE Retaining Wall System'. The block is supplied with a fiberglass pin, which holds the grid so that the block and grid are interlocked. When using this block, fiberglass pins are inserted into the paired holes in each block (the blocks are fixed to each other and automatic setback by the pins). Backfill is backfilled with 13-25mm of crushed stone or drained soil according to the work plan calculated by retaining wall size and soil quality. The base bottom picking and the first stacking and back filling step (S500) may be applied to various forms in the field.

Next, the step (b) of laying the grid is the fixed bar installation according to the present invention as described above (S510), grid laying and tofu treatment (S520), after the reinforcement bar installation to fix the grid to the reinforcement bar (S530), the grid Fixing to the block (S540) is performed so that the grid fixing mechanism according to the present invention is applied to the necessary portion as shown in FIG. Referring to FIG. 12, the step S510 of installing the fixing bar 30 is performed by a grouting method or a mechanical method as described above by installing a plurality of fixing bars 30 to have a pullout resistance at a predetermined position. . After laying the grid 50 to process the head (S520) to install the grid 15 on the soil layer 12 and the block 16, avoiding the portion where the fixed bar 30 and the grid 50 interferes The head 50 is disposed so that the interference portion generated between the fixed bar 30 and the grid 50 is arranged so that the grid 50 contacts the soil layer 12, and then the grid 50 is installed after the reinforcement bar 40 is installed. This is to make the reinforcement bar 40 easily wound. After installing the reinforcement bar 40 and fixing the grid 50 to the reinforcement bar 40 (S530), the end of the grid 50 positioned on the soil layer 12 is wound around the reinforcement bar 40 and fixed. The method of fixing the grid 50 to the reinforcing bar 40 is to proceed in the same manner as in the grid fixing mechanism described above.

On the other hand, as shown in FIG. 12, when the fixing bar 30 is installed on a rock wall or a cut slope, the above-described base bottom leveling and first stacking and back filling may be performed before the step S500. That is to say that the grouting operation is generally performed while cutting from the upper part of the rock or cut slope when cutting, and in the present invention, it is to install the fixing bar 30 when cutting. In this case, of course, it will be necessary in the management of the work to install the reinforcing bar 40 and the installation of the fixing bar 30 in consideration of the use of the grid 50 in the future. Tofu treatment (S520), the step of fixing the grid to the reinforcement bar after installing the reinforcement bar (S530), etc. proceeds while filling or proceeding immediately after the installation of the fixed bar 30 and later when the grid 50 is attached to the ground (10) You will be able to proceed with the process. The step S540 of fixing the grid 50 to the block 16 is to pull the end of the grid 50 positioned in the block 16 to fix it to the block 50 by tightening the ends of the grid 50 located in the block 16. Temporarily fix the grid 50 to the pins. After proceeding such a process, the step of stacking the top block, filling the backfill and filling the soil layer (S550) is repeatedly performed to construct the reinforced soil retaining wall as shown in FIG. 12.

According to the construction method according to the preferred embodiment of the present invention as shown in Figure 14 to allow the construction of the extension road portion while reducing the cut area of the existing fill portion as possible. 13 is a view showing a construction method of a general reinforcement slope in sequence, Figure 14 is a view showing an example of a reinforcement slope constructed in the (existing) fill portion according to the construction method of the present invention.

Referring to FIG. 13, the construction of the reinforcing slope is a method of forming a slope more urgently than a general soil slope by installing a grid on the soil slope. Compensation slopes can utilize on-site surplus soil generated by excavating the ground, unlike reinforced soil retaining walls. The reinforcement slope does not constitute a block compared to the construction method of the above-mentioned reinforcement soil retaining wall, but the process of installing a short reinforcement in the front of the slope with only the grid 14 or enclosing the reinforcement (when the slope is more than 45 °) It is done repeatedly. Since the grid 50 is installed using the grid mechanism according to the present invention as described above, detailed description thereof will be omitted. Figure 14 shows an example of the reinforcement slopes constructed in accordance with the construction method of the present invention, such a reinforcement slopes by reducing the cut area (A) can be reduced to the fill area and at the same time natural construction.

As described above, the grid fixing mechanism for the construction of the reinforcement earth retaining wall and the reinforcement slope according to a preferred embodiment of the present invention and the construction method of the fill portion and the cut portion using the same according to the above description and drawings, for example Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit and scope of the present invention.

According to the present invention, it is possible to construct using the grid while minimizing the amount of breaks in the fill area, and to enable the use of the grid even in the fill area that cannot secure the length of the grid, thereby improving the economics and convenience of the construction and air. To shorten. In addition, it is possible to construct eco-friendly structures by minimizing the cut amount of the cut portion, and has an effect of reducing the construction cost.

Claims (6)

A plurality of fixing bars, one end of which is inserted into the ground of the fill portion or the cut portion for constructing the reinforcement soil retaining wall and the reinforcement slope, and the other end of which is projected to have a predetermined length over the ground; A reinforcing bar coupled to the fixing bar to connect the plurality of fixing bars at a predetermined height from the ground; Including the grid which is fixed to the backfill of the fill portion or the cut portion or the soil layer to be laid, the grid is fixed to the reinforcement bar, and the grid is not secured even if the length of the installation of the grid cannot be secured and the cut area is difficult to increase. Grid fasteners for the construction of reinforced earth retaining walls and reinforcement slopes. The method of claim 1, The grid is fixed to the construction of the reinforcement soil retaining wall and reinforcing slopes, which is fixed by being inserted into the end of the connecting bar located on the other side of the grid in a state extending in the opposite direction from one side of the reinforcement bar to the other side Instrument. The method according to claim 1 or 2, The reinforcing bar is provided with two or more bars are spaced apart from each other in the longitudinal direction of the fixing bar, a plurality of space between the adjusting piece is installed at regular intervals between the grid anchor mechanism for the construction of the retaining soil retaining wall and reinforcing slopes. The method according to claim 1 or 2, The fixing bar has an end portion formed by bending a 'U' shaped portion protruding above the construction ground, and the reinforcing bar is inserted into the inner end of the reinforcement soil retaining wall and reinforcing slopes, including being coupled to the fixing bar. Grid fixtures. Installing a plurality of fixing bars to have a pull-out resistance at a predetermined position on the ground of the fill portion or the cut portion for constructing the reinforcement soil retaining wall and the reinforcement slope; Tofu processing a grid avoiding a portion that interferes with the fixing bar; Coupling a reinforcement bar to connect the plurality of fixing bars; Construction method of the fill section and cut section using a grid fixing mechanism comprising the step of winding the end of the grid to the reinforcement bar. The method of claim 5, wherein The fixing of the grid to the reinforcement bar comprises the step of winding the grid around the reinforcement bar and connecting the two grids via a connection bar, the construction method of the fill and cut section using a grid fixing mechanism.