KR20020034546A - Bar type grid and structure for reinforcing block retaining wall used it - Google Patents

Abstract

PURPOSE: A reinforcing structure of a block retaining wall using a bar type grid is provided to stabilize the structure of a retaining wall and to simplify an installation work of a grid. CONSTITUTION: The reinforcing structure of a block retaining wall using a bar type grid comprises: a block(20) forming the front of a retaining wall and containing a head part(21) with filling parts(21a)(21b)(21c) and a tail part(23), wider than a connection part(22), connected through a connection part(22) narrower than the head part(21); earthy materials filled up the rear of the block(20); a bar type grid(10) buried under earthy materials and composed of a grid body hardened in a bar shape after mixing glass fiber in synthetic resins and circular holes(12) formed in zigzags and filled up with earthy materials, and fixed to the block(20) by driving fixed pines(30)(31) to mortar filled up the filling part(21a) through the hole(12); and an earth anti-shoving plate(40) interposed between fixed pins(50)(51) through rear holes of the bar type grid to connect several bar type grids(10) and to prevent earthy materials in the rear from being shoved forward.

Description

Bar-type grid and reinforcing structure of block retaining wall using the same {BAR TYPE GRID AND STRUCTURE FOR REINFORCING BLOCK RETAINING WALL USED IT}

The present invention relates to a reinforcing structure of a bar grid and a block retaining wall using the same, and more particularly, to a bar grid and a reinforcing structure of a block retaining wall using the same, to stabilize the structure of the block retaining wall and simplify the installation work of the grid. It is about.

Block retaining walls are constructed on roadside slopes, banks, riverbanks, and landscaping walls only. Block retaining walls constitute the front surface and consist of blocks made of concrete, stone, brick or stone, and earth and sand filling the back of the block. In other words, the block blocks the soil from being pushed forward.

However, when the retaining wall is stacked vertically high, the binding force between the blocks alone cannot maintain sufficient strength against the load acting on the soil from the upper side and the rear side of the block. Therefore, a reinforcing member called a grid is used to stabilize the retaining wall structure. do.

The grid consists of various shapes and structures and is embedded in the ground behind the block.

Hereinafter, a reinforcing structure of a conventional block retaining wall will be described with reference to the accompanying drawings.

FIG. 1 is a plan view of a retaining wall to which a mesh grid is applied. For example, as shown in Korean Patent Application No. 20-1999-14475, the mesh grid 1 includes a band member 1a made of polyester in a lateral direction and Tied in the longitudinal direction to form a net structure.

The mesh grid 1 has its tip end fixed to the block B, and is embedded in multiple stages with a certain height inside the soil of the retaining wall W.

Then, the mesh grid 1 embedded in the earth and sand prevents the earth and sand from being pushed toward the block B by the frictional force of the pressure received from the soil, and reduces the horizontal earth pressure acting on the block B.

2 is a side view of the retaining wall to which the reinforcing grid is applied, for example, as shown in Korean Patent Application No. 10-1998-770, the reinforcing grid 2 is applied to the earth and sand with its tip fixed to the block B. FIG. It is composed of a reinforcing bar (2a) and a fixed concrete ingot (2b) coupled to the rear end of the reinforcing bar (2a), by placing the reinforcing grid (2) on the soil and cover the soil again Construct

The reinforced grid 2 also supports the block B not to be pushed to the front side by the friction force between the reinforcing bars 2a and the soil and the fixing of the concrete ingots 2b.

3 is an external perspective view of the band-shaped grid, and FIG. 4 is a cross-sectional view taken along line AA of FIG. 3 to show the internal structure of the band-shaped grid. For example, as in Korean Utility Model Application No. 20-2000-3363, the band-like grid 3 includes a polyethylene sheath 3a and a plurality of lines of high strength polyester embedded in the polyethylene sheath 3a and joined in several strands. It consists of a fiber band 3b.

In the center of the polyethylene sheath 3a, a plurality of pin holes 3c penetrating up and down are punctured along the longitudinal direction, and resistive protrusions 3d protrude from the left and right sides thereof.

According to the band-shaped grid 3 configured in this way, although not shown in the drawing, the grid 3 is placed on the earth and sand, and a pin 3 (not shown) is inserted into the pin hole 3c of the grid 3 to form the grid 3. Temporarily fix the to earth and sand, and cover it with soil.

According to the conventional grid described so far, there are the following problems.

1. According to the mesh grid 1, the polyester fiber, which is the material of the mesh grid 1, is stretched due to the pressure of earth pressure because the tensile ratio is very large, and does not prevent the soil from being pushed to the block B side over time. The magnitude of the stress is small.

In order to fix the mesh grid 1 to the block B, the frontmost polyester fiber band must be inserted over all the blocks B, which is very cumbersome and inconvenient.

In addition, since the mesh grid 1 stabilizes the structure of the retaining wall W depending only on the frictional force with the soil, the length of the grid 1 is inevitably increased. Therefore, the mesh grid 1 cannot be used where the back length behind the block B is short, so that the utility is inferior.

On the other hand, since the mesh grid 1 is flexible, when the earth and sand are covered thereon, the mesh grid 1 is easily folded or bent by the force applied from the soil, and thus does not perform a function as a reinforcing member and is expensive.

2. According to the reinforcing grid 2, the reinforcing bar 2a is easily corroded by moisture, and the strength of the reinforcing bar 2a is weakened. There is a problem that the cost is expensive.

In addition, since the weight of the reinforcing bar (2a) is heavy and the price is expensive, work such as installation and transportation is very inconvenient, and there is a problem that the construction cost increases.

On the other hand, both the mesh grid (1) and the reinforcing grid (2) is constrained by the installation conditions, such as can not be constructed using the Soil Nail method in its shape and structure.

3. The strip-shaped grid 3 is installed only by the pressing of the load applied from the upper soil, and when the pressure is applied from the soil, the grid 3 slides to the block side in the soil and is pulled out or tensioned.

In addition, since polyethylene and polyester fibers, which are the material of the strip-shaped grid 3, have a very high tensile ratio, the strip-shaped grid 3 is stretched due to the pressure of the earth pressure and thus does not prevent the soil from being pushed to the block side. Is generated.

The present invention has been invented to solve the above-described problems, and an object of the present invention is to provide a bar grid and a block reinforcing structure using the same so as to stabilize the overall structure of the retaining wall.

Another object of the present invention is to prevent deformation such as bending or folding the grid during construction of the grid.

Further, another object of the present invention is to be able to construct the grid in a simple and simple way, and to be applied by applying a variety of construction methods.

1 to 4 show a grid according to the prior art,

1 is a plan view of a retaining wall to which a mesh grid is applied;

2 is a side view of a retaining wall to which a reinforced grid is applied;

3 is an external perspective view of the strip-shaped grid;

4 is a cross-sectional view taken along the line AA of FIG.

5 is an external perspective view of the bar grid according to the present invention.

6a and 6b show another embodiment of a hole applied to the grid according to the present invention,

Figure 6a is a circular hole formed in a line,

Fig. 6B shows the holes in the grid width direction arranged in a row.

Figure 7 is a perspective view showing a reinforcing structure of the block retaining wall using a bar grid in accordance with the present invention.

Fig. 8 is a cross-sectional view of a block retaining wall in which a bar grid according to the present invention is installed by a soil nail method.

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

10: grid 11: grid body

12: hole 20: block

30, 31, 50, 51: fixed pin 40: earth and sand prevention plate

Bar grid according to the present invention is provided to achieve the above object, the grid body is embedded in the soil of the retaining wall and the glass fiber is mixed in the interior of the synthetic resin cured in the form of a bar; It is formed on the grid body, characterized in that it comprises a plurality of earth-filling hole is filled with the soil.

Preferably, the soil filling hole is a circular hole.

The earth fill hole may be a long hole formed in the width direction of the grid body.

On the other hand, the holes are preferably formed in a line along the longitudinal direction of the grid body.

The hole is zigzag.

According to the bar grid according to the present invention configured as described above, the grid is installed on the soil by the fitting structure based on the earth and the earth filled in the hole by the load of the soil, and does not slip or fall out of the soil, while the glass is a material of the grid Due to the nature of the fiber, the grid has a small tensile ratio, so that the grid does not deform against the pressure of the soil and effectively supports the soil from being pushed to the block side.

In addition, the grid is light in nature, the strength is large, the construction work is convenient, and the construction cost can be reduced to 1/3 the construction cost of the existing grid.

In addition, the reinforcing structure of the block retaining wall using the bar-shaped grid according to the present invention, the block is constructed to a certain height from the ground; Earth and sand accumulated in the rear portion of the block; Buried in the soil of the retaining wall, the glass fiber is mixed in the synthetic resin is cured in the form of a bar, characterized in that it comprises a bar-shaped grid provided with a plurality of soil filling holes filled with the soil.

The reinforcing structure of the block retaining wall according to the present invention is preferably configured to include a fixing member fixed to the inner filling portion of the block filled with mortar while being fitted to the front end of the bar grid to fix the grid.

In addition, the reinforcing structure of the block retaining wall according to the present invention further comprises an earth and sand prevention member which is coupled to the grid while being perpendicular to the grid and prevents the soil on the rear side from being pushed forward.

Preferably, the earth and sand prevention member, it is made of a plate-like, the vertical surface is erected so that the wide surface in the front and rear direction.

The earth and sand prevention member is inserted into and fixed between two or more fixing members fastened to the earth and sand through the grid.

According to the reinforcing structure of the block retaining wall using the bar grid according to the present invention configured as described above, the bar grid is firmly installed in the soil through the soil filled in the hole, and the tensile strength against the pressure of the soil is due to the characteristics of the material. Since the ratio is small, the block is not pushed forward, and the soil piled up on the rear side of the anti-soil damping member is not pushed forward to stabilize the retaining wall structure.

In addition, the reinforcing structure of the retaining wall using the bar grid according to the present invention, the cut, rock and; A retaining wall comprising a block constructed in multiple stages at the front of the cut and rock; A hole formed in a cut and a rock of the retaining wall; While being inserted into the hole is fixed to the mortar and the like, the front end portion is characterized in that it comprises a bar grid fixed to the block.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

5 is an external perspective view of the bar grid according to the present invention, Figures 6a and 6b shows another embodiment of the hole applied to the bar grid according to the present invention, Figure 6a is a circular hole is arranged in a line, FIG. 6B is a view showing arrangement of long holes in a grid width direction, and FIG. 7 is a partial perspective view of a retaining wall showing a reinforcing structure of a block retaining wall using a bar grid. The same components as in the prior art are given the same reference numerals as in the prior art.

As shown in FIG. 5, the bar grid 10 according to the present invention includes a grid body 11 in which glass fibers are mixed into a synthetic resin such as polyester and cured in a bar shape, and the length of the bar grid grid 11. It consists of a circular hole 12 which is zigzag along the direction and is filled with soil.

6A, the circular holes 12 may be formed in a line along the longitudinal direction of the grid body 11.

In addition, as shown in Figure 6b, it can be formed in a row while forming a long hole 12a in the width direction of the grid body 11, the shape and arrangement of the holes 12, 12a is limited to any one form It doesn't work.

Grid 10 according to the present invention is a glass fiber of 20 ~ 26 μ thick consists of a concentration density of 40 ~ 46 strands per 1 mm2 unit of the cross-sectional area of the grid 10, the grid 10 is the thickness (depending on the use of the allowable stress) T) 3 to 6 mm, width (w) of about 30 to 100 mm is produced, and the holes 12 are drilled one by one in the form of a lattice at intervals of 5 to 10 mm at intervals of 5 to 10 mm and in the form of grids. The allowable stress is different from the dimensions of the grid 10 and has a range of 3.0 to 19.5 Ton / m.

Compared with the conventional tensile strength of the grid 10 according to the present invention as shown in Table 1 below. (As shown in Table 1, the grid 10 according to the present invention used two samples.)

Table 1

division Conventional grid Sample 1 of the Invention Sample 2 of the Invention standard w30 X T3 (mm) w30 X T3 (mm) w40 X T4 (mm) The tensile strength 0.25Ton 3.24Ton 6.54 Ton

The reinforcing structure of the block retaining wall using the bar grid according to the present invention is as follows.

The block 20 forming the front surface of the retaining wall, the earth and sand (not shown) filled in the rear portion of the block 20, and the front end portion is on top of the filling portion 21a of the block 20, and the rear portion is It is configured to include a bar grid 10 embedded in the soil.

The block 20 is provided with a filling portion 21a penetrating up and down in the center thereof, while the filling portion 21b and 21c are recessed in the left and right sides, and the head portion 21 is provided. It is connected via a connecting portion 22 having a narrower width than) and is composed of a tail 23 wider than the connecting portion 22.

Fixing pins 30 and 31 are embedded in mortar filled in the filling portion 21a through the holes 12 in at least one end of the bar-shaped grid 10 to block the grid 10. Secure in.

In addition, the reinforcing structure of the block retaining wall according to the present invention further includes a soil-soil prevention plate 40 which connects the plurality of bar grids 10 and prevents the soil from the rear side from being pushed forward.

The earth and sand prevention plate 40 is inserted and inserted between the fixing pins 30 and 31 embedded in the lower soil through two holes on the rear side of the bar grid 10 so that the wide surface faces forward and backward. do.

The earth and sand prevention plate 40 may use the bar grid 10 without deformation.

As described above, the block retaining wall construction method to which the reinforcing structure using the bar grid is applied will be described. As shown in FIG. 7, the block 20 is stacked so that the surface with the concrete anchor is placed on the foundation for installing the retaining wall. .

Subsequently, the inside of the block 20 and its back is filled, and the back of the block 20 is filled with granular drainage material (25 mm or less of crushed stone), and the inside of the head portion 21 (21a) (21b) ( Fill mortar and crushed stone in 21c).

In addition, the soil is filled in the soil section in the back of the block 20, at this time, the soil is sufficiently placed on the front of the block 20 so that the block 20 is not pushed forward by the pressure of the soil filled in the soil section. .

In this way, the first end of the retaining wall is formed, and the bar grid 10 is provided thereon.

The bar grid 10 is placed on the upper surface of the block 20, and the mortar or rubble-filled block 20 is inserted by inserting the fixing pins 30 and 31 (shown in two places in the figure) into the holes of the tip end thereof. Insert into the filling portion 21a of the head portion 21 of the

Insert the fixing pins (50) and (51) into two grid holes at the position where the soil preventing plate (40) is to be installed. Put the earth and sand prevention plate (40) vertically between (51).

Using the bar grid 10 and the soil barrier plate 40 to build a group of reinforcing structures, while the block 20 is piled up in a zigzag form on the back to build a retaining wall by laying up the soil.

The action of the reinforcing structure of the bar grid and the block retaining wall using the same according to the present invention is as follows.

The grid 10 prevents the soil from being pushed toward the block 20 by the frictional force with the soil. The grid 10 is hardly tensioned by the pressure applied from the soil because the tensile strength is low due to the characteristics of the material. The block 20 is not pushed forward by this.

On the other hand, by the earth and sand filled in the holes 12 (all the pins 30, 31, 50, 51 is not fastened) of the grid 10 is connected to the earth and sand piled up on the grid 10 The grid 10 is embedded in the soil fitting structure by the soil filled in the hole 12 of the grid 10.

Therefore, even if a forcing force is applied to the grid 10, the grid 10 does not slide or tension toward the block due to the binding force due to the fitting between the soil and the grid 10.

Then, the earth and sand accumulated on the rear of the earth-soil barrier plate 40 is not pushed forward by the earth-soil barrier plate 40 disposed in the width direction of the retaining wall.

On the other hand, the grid 10 according to the present invention can be installed using a small nail method in the cut back, the rock with a short back length, the method and structure will be described with reference to the drawings, Figure 8 is a cut surface by a small nail method As shown in the drawing, the retaining wall in which the grid 10 according to the present invention is constructed, as shown in the figure, drills a hole 60 having a diameter of 100 to 150 mm at regular intervals in the soil layer or the rock. The grid 10 of the present invention is inserted into the hole 60 (in this case, the front end portion of the grid 10 is inserted to protrude to the outside of the cut surface for the connection of the grid 10 and the block 20), and the hole ( Injecting the mortar and the like to the grid 10 to fix the grid 10, the block 20 by using the method described above to the front end of the grid 10 protruding from the cut surface while stacking the block 20 in front of the cut surface Fixed to the block, and the block 20 Fill the rubble, gravel-like material for drainage between the tomyeon.

Therefore, even when the pressure of the soil is applied to the grid 10, the grid 10 is not slipped or stretched in the soil by the soil filled in the hole 12 of the grid 10, and in addition, the grid 10 ) Is not tensioned, so the filling phenomenon of the conventional block does not occur.

Then, the grid 10 is placed on the upper surface of the block 20, and the installation of the grid 10 is completed by inserting the fixing pins 30 and 31, thereby making installation easier than the conventional mesh grid.

In addition, because the strength of the grid 10 itself is large, the earth and sand piled up thereon does not fold or bend like a mesh grid made of conventional polyester.

In addition, the construction work is very easy because the weight of the grid 10 is lighter than the weight of the conventional reinforced grid.

In addition, the hole 12 may be formed in various shapes as well as circular, without being restricted by the shape and size of the grid 10, and the size and position thereof may be freely formed in the structure of the grid 10. Therefore, it is less restricted than fabricating the resistive projection of the conventional strip-shaped grid.

In addition, through the simple operation of drilling a hole in the retaining wall and inserting the grid 10 according to the present invention in the hole can be conveniently installed in the existing retaining wall.

As described above, according to the reinforcement structure of the grid and the block retaining wall using the same according to the present invention, since the grid is firmly embedded in the material and the soil, the tension degree against the pressure exerted from the soil is small so that the soil is pushed to the block side. It is possible to stabilize the structure of the retaining wall as a result.

And, since deformation does not occur during construction of the grid is excellent in workability.

In addition, since the grid of the present invention is superior in strength and tensile rate to existing products, the same effect can be obtained even if a smaller quantity is installed on the same size retaining wall than other products. It is very economical because it is about 1/3 lower than when used.

Lastly, it is possible to increase the utility of the product because it is not restricted by the construction area such as it can be easily installed using the Soil Nail method even on the cut surface with short back length of the block due to the large pressure against the pressure from the soil.

Claims (12)

A grid body 11 embedded in the earth and sand of the retaining wall and hardened into a bar shape by mixing glass fibers inside the synthetic resin; Bar grids, characterized in that formed on the grid body 11 and comprises a plurality of earth-filled holes are filled with the soil. According to claim 1, wherein the grid body 11, 20 ~ 26μ thick glass fiber is made of a condensation density of 40 to 46 strands per 1 mm 2 unit of the cross-sectional area of the grid body 11, the grid body 11 When the thickness of 3 to 6 mm, the width of 30 to 100 mm, the hole 12 is formed in a zigzag form with a diameter of 5 to 10 mm, interval 5 to 10 mm, characterized in that the allowable stress is 3.0 to 19.5 Ton / m Bar grid. The bar grid according to claim 1, wherein the earth filling hole is a circular hole (12). The bar grid according to claim 1, wherein the soil filling hole is a long hole (12a) formed in the width direction of the grid body (11). 5. Bar grid according to claim 3 or 4, characterized in that the holes (12) are formed in a line along the longitudinal direction of the grid body (11). 5. Bar grid according to claim 3 or 4, characterized in that the holes (12) are zigzag. A block 20 constructed at a predetermined height from the ground; In the retaining wall comprising the earth and sand accumulated in the rear portion of the block (20); A block using a bar grid, which is embedded in the retaining wall of the retaining wall, and includes a bar-shaped grid having a plurality of earth-filling holes filled with the soil by mixing glass fibers into a synthetic resin and curing the bar. Reinforcement structure of the retaining wall. The method of claim 7, wherein the bar-shaped grid 10 is fitted to the front end of the mortar is filled in the inner filling portion 21 of the block 20 is filled with a fixing member for fixing the grid 10 Reinforcement structure of block retaining wall using bar grid. [8] The bar grid according to claim 7, further comprising an earth and sand prevention member which is coupled to the grid 10 while being orthogonal to the grid 10, and which prevents the soil of the rear side from being pushed forward. Reinforcement structure of block retaining wall using. 10. The method of claim 9, wherein the earth soiling prevention member, Reinforcing structure of the block retaining wall using a bar-shaped grid, characterized in that it is made of a plate-like, the wide surface is vertically erected in the front and rear direction. 11. The method of claim 10, wherein the earth and sand prevention member, Reinforcing structure of a block retaining wall using a bar grid, characterized in that the penetrating through the grid 10 is sandwiched between two or more fixing members fastened to the soil. Cut, rock mass; In the retaining wall comprising a block (20) constructed in multiple stages in the front of the cut, the rock; A hole 60 formed in the cut and rock of the retaining wall; Reinforcing structure of a block retaining wall using a bar grid, characterized in that the bar 60 is inserted into the hole 60 is fixed to the mortar and the like, the front end is fixed to the block 20, the bar-shaped grid is configured.