KR100890828B1 - Geosynthetic reinforced soil and reinforced concrete retaining wall - Google Patents

Abstract

A reinforced earth RC retaining wall is provided to improve the durability and stability of reinforced earth retaining wall since the concrete front surface and reinforcement are integrated using the support mold. A reinforced earth RC retaining wall comprises a concrete front surface(110) forming the front side of the reinforced earth retaining wall with the concrete cast-in-place, and a reinforcement installed behind the concrete front surface. The reinforcement includes a foundation reinforcing stone(121), a geo-textile(122) which surrounds the foundation reinforcing stone, and which is installed in the reinforced earth, a support mold(123) maintaining the geo-textile covering the underpinning stone, a reinforced earth(124) hardened behind the foundation reinforcing stone.

Description

Reinforced soil RC retaining wall {GEOSYNTHETIC REINFORCED SOIL AND REINFORCED CONCRETE RETAINING WALL}

The present invention relates to a reinforcement earth retaining wall, and more particularly, to combine the advantages of the reinforcement earth retaining wall with good workability by the advantages and ductility of the existing reinforced concrete (RC) retaining wall excellent in durability and stability, during construction Allowing deformation to maximize the reinforcing effect by promoting the development of tensile force of the reinforcement, and after the deformation of the reinforcing soil is converged, the concrete is placed on the wall to suppress the deformation during public use. It is about.

Conventional gravity retaining wall or reinforcement concrete retaining wall has abundant construction experience and safety and durability verification history, but these retaining walls are gravity resistant against external force (earth pressure). It becomes uneconomical.

However, the reinforcement soil retaining wall has a cross section of the retaining wall because the metal or civil fiber (non-woven fabric, composite fabric, geogrid, woven fabric, etc.) reinforcement of each layer laid in the reinforcement soil shares the earth pressure with the tensile force developed at the soil-reinforcement interface. Even if it is small, it becomes stable to earth pressure.

In order to promote the tensile force development of the stiffeners, frictional forces must be generated at the soil-reinforcement interface and deformation must occur. In other words, in order to maximize the reinforcement effect of the reinforcement, the deformation of the reinforcement soil should be allowed within the range that the reinforcement is not destroyed during construction.

However, the general reinforcement retaining wall is difficult to compact near the block 1 because the wall surface (concrete block 1 (or panel)) and the backfilling soil are constructed at the same time as shown in FIG. Even if the block (1) of the opening is out of the soil or the stability of the reinforcement soil is not abnormal in appearance seems dangerous, if the deformation is large, the connecting pins connecting the blocks (1) can be destroyed and the wall surface can be destroyed. In addition, if the construction of the reinforcing soil wall is performed without sufficient deformation of the foundation ground, cracks due to gaps or concentrated loads due to uneven settlement or cracks due to localized loads or pull-outs in which local depressions or reinforcements (2) are pulled out Will occur.

In addition, since the block 1 or the panel is constructed in multiple stages, it is unsuitable for the rake retaining wall to which water comes into contact, and it is difficult to construct due to excessive deformation on the soft ground. For this reason, reinforcement concrete retaining walls are mainly constructed near the lakeside.

On the soft ground, as shown in FIG. 2, the "L" type reinforced concrete retaining wall 4 using the support of the pile foundation 3 is generally applied. However, the reinforced concrete retaining wall (4) is uneconomical for large-scale construction if the height is increased.

3 and 4 show the alternating using the reinforced concrete retaining wall and the general reinforced soil retaining wall. In the case of reinforced concrete retaining wall, shear force and moment are concentrated on the bottom of the shift, so the size of the shift (5) structure is increased, and when the backfilling soil is compacted, the sliding phenomenon occurs in front of the shift, so that the compaction cannot be made.

And, as shown in Figure 4, in the case of reinforcement soil retaining wall there is a lack of work space in the pile foundation (6) and the wall surface (block (1) or panel) part can not be sufficient compaction. For this reason, unequal settlement occurs at the boundary of the shift and backfill soils, and jungle phenomenon occurs frequently in front of the shift.

The economics of reinforcement soil retaining wall are largely dependent on the transport distance of backfilling soil, and it is necessary to utilize local soil to maximize economic efficiency. Reinforcement earth retaining wall reinforcement is being attracted attention, non-woven fabrics that have a drainage function, but the stiffness and deformation is large compared to the geogrid is rarely used as a reinforcement soil retaining wall reinforcement, geogrid is applied in most cases. However, non-woven fabrics are more economical than geogrids and have greater frictional forces at the soil-reinforcement interface, which can be much more useful than geogrids if they allow deformation of reinforced soils during construction.

To construct an ideal reinforcement retaining wall, the wall during construction should be flexible as long as stability permits to accommodate the deformation of the ground and promote the development of tensile force of the reinforcement, but during construction, it must have sufficient rigidity for safety, durability, and aesthetics. do. Therefore, since the conditions of the wall during the construction and after the construction are in conflict with each other, current reinforcement soil retaining wall construction method in which the wall and the backfilling soil are constructed at the same time is not sufficient to satisfy these two conditions.

The present invention is to solve the above problems, the step of separating the reinforcement soil and the wall of the reinforced soil retaining wall reinforcement to accommodate the large deformation occurring in the foundation ground and backfilling soil during construction regardless of the stability of the wall Maximizes economics by enabling the use of nonwoven fabric and viscous soils as the backfilling and backfilling soil, maximizing the reinforcing effect by inducing tensile force development of reinforcement by inducing deformation of reinforcing soil, and integrating concrete on the wall after the deformation of reinforcing soil is converged The purpose is to provide a reinforced RC retaining wall that can be used as a revetment and soft ground retaining wall, and can be used alternately with reinforced earth retaining wall by constructing a rigid wall and eliminating the possibility of deformation suppression and drawing failure during common use.

Reinforced soil RC retaining wall according to the present invention for achieving the object as described above, the concrete front portion to form a front surface of the reinforced soil retaining wall by reinforcing the reinforcement in the concrete site; And, after maintaining the basic reinforcement, the surface geosynthetic fiber surrounding the foundation reinforcement, the reinforcement soil is laid, the geosynthetic fiber surrounding the basic reinforcement in a certain form to induce independence and after the reinforcement is built and the front of the reinforcement and concrete It is characterized by consisting of a reinforcing part constructed in the rear of the concrete front portion, including a support frame for performing the function of the anchoring anchor to connect the unit, the reinforcement to be filled in the rear of the foundation reinforcement.

Reinforced soil RC retaining wall of the present invention, by combining the existing reinforced concrete retaining wall and block-type reinforced earth retaining wall to complement the respective disadvantages and to maximize the advantages of each, large deformation in the backfilling soil (reinforced body) and foundation ground during construction Can be accommodated regardless of the stability of the wall, it is possible to apply various geotextiles (non-woven fabric, composite fabric, geogrid, woven fabric, etc.) reinforcement and backfilling soil, maximize the reinforcing effect, and backfill using the support frame As well as compacting the soil, the concrete front part and the reinforcing part are integrated to improve the durability and stability of the reinforced soil retaining wall, so that it can be applied to general fills, soft ground, water protection and alternating parts.

In addition, the concrete front part integrated with the reinforcement part forms a continuum beam structure supported by a small continuous space (vertical spacing of the reinforcement material), and thus acts on the earth pressure and the lower part of the wall as compared with gravity or reinforced concrete retaining wall. The moment, shear force, etc. are remarkably small, and the force that resists external force is larger than that of the general block type reinforced soil retaining wall.

In addition, unlike the general block-type reinforced earth retaining wall, since it has an integrated concrete rigid wall, no additional reinforcement is required for the construction of handrails, soundproof walls, power poles, etc. You can also expect the side effect of building the retaining wall by connecting the nailing directly to the front wall.

As shown in FIG. 5, the reinforced soil RC retaining wall 100 according to the present invention includes a concrete front portion 110 and a reinforced portion (reinforced soil) 120.

Concrete front portion 110 is to form the front surface of the reinforced soil RC retaining wall 100, can be made by site casting, reinforcement 111 is reinforced therein.

Reinforcing bar 111 is for the reinforcement of the concrete front portion 110, the longitudinal reinforcement (111a) and the transverse reinforcement (111b) is a configuration connected at appropriate intervals.

The reinforcement 111 is connected to the reinforcement part 120 to bind the concrete front part 110 and the reinforcement part 120 to each other, which will be described in detail in the description of the reinforcement part 120.

The reinforcement part 120 supports the basic reinforcement stone 121 and the basic reinforcement stone 121 in multiple stages, and maintains the shape of the geosynthetic fibers 122 and the geosynthetic fibers 122 on which the reinforcement soils are laid. The mold 123, the reinforcement soil 124 is filled in the rear of the basic reinforcement stone 121.

Basic reinforcement stone 121 is easy to compact the front part of the reinforcement soil, small compressibility after construction, to improve the adhesion to the concrete front wall by seeping the concrete mortar, and to form the induction drainage from the backfilling soil to form the front concrete wall This is to reinforce the pore water pressure.

That is, the basic reinforcement stone 121 can be used for everything that can achieve this purpose.

As shown in Figure 5 and 6, the surface geosynthetic 122 is a base reinforcement stone 121 is raised to cover the front end to the top and the rear is made of a length that can be embedded in the reinforcement soil 124 , Composite fabric, woven fabric and the like.

       Geosynthetic fiber 122 is also embedded in the reinforcement soil 124 to accommodate the basic reinforcement stone 121 and serves as a reinforcing material (geogrid, etc.).

The support frame 123 takes the shape of the foundation reinforcement stone 121 together with the geotextiles 122, and after the reinforcement part 120 is constructed, connects the reinforcement part 120 and the concrete front part 110 to make it integral. will be. Geotextile 122 will be difficult to stand on a certain form because it is a flexible fibrous material, the support frame 123 is formulated to a predetermined shape to maintain the geosynthetic 122 in its form and the basic reinforcement stone 121 To be stacked. The support mold 123 may have a structure in which rebars are woven in the longitudinal direction.

Reinforcing support frame 123 is composed of a bottom portion (123a), a connecting portion (123c) and a vertical portion (123b) is laminated in multiple stages with the geotextile 122, the connection portion 123c in the front end is a concrete front portion ( It is connected to the reinforcing bar 111 of 110. The connection part 123c may be in the form of a ring in which the longitudinal reinforcing bars 111a of the reinforcing bar 111 are fitted. Connection of the connecting portion 123c and the reinforcing bar 111 may be connected by connecting the connecting portion 123c to the reinforcing bar 111 or connecting the connecting portion 123c and the reinforcing bar 111 with a separate wire or the like. .

The support mold 123 may be fixed to the ground (reinforced soil) by the anchor pin 123d.

In the present invention, the vegetation part 300 is further provided as necessary to solve the disadvantage of the aesthetics of the concrete front part 110. The vegetation part 300 may be formed at the bottom of the concrete front part 110, and may be formed in multiple stages in the concrete front part 110 without being limited to that illustrated in the drawing. In addition, a water supply hole 310 may be formed in the first stage concrete front part 110-1 to supply drinking water to the vegetation part 300.

Hereinafter, a method for constructing a reinforced soil RC retaining wall according to the present invention.

(S10) Concrete front part reinforcement.

After flattening the ground for constructing the reinforcement soil RC retaining wall 100 flat and marking the line according to the construction position of the concrete front part, the formwork (M1) and the reinforcing bars (111-1) in accordance with this line. After installing the support mold 123 in accordance with the formwork (M1) installed and anchored by anchor pins (123d), at this time, the reinforcing bars 1110-1 and the support mold 123 are connected to each other through the connecting portion (123c). (FIG. 7A). The above process can be said to be a process for pouring a base part.

      (S20) Concrete front part casting.

On-site concrete is poured into the formwork to construct the concrete front portion 110-1 of the first stage (Fig. 7b). The first stage concrete front portion 110-1 is in charge of the foundation of the reinforced soil retaining wall.

(S30) Laying the basic reinforcement stone.

Lay a planar geosynthetic fiber 122 on the support frame 123, lay the foundation reinforcement stone 121 on the geosynthetic fiber 122, and then cover the front of the geosynthetic fiber 125 to the basic reinforcement stone 121 . Subsequently, the reinforcement soil 124 is laid up to the height of the foundation reinforcement stone 121 to install the one-stage reinforcement portion 120-1 (FIG. 7C). The construction of one stage is completed by the above process.

(S40) Two-stage construction.

As shown in FIG. 7D, the two-stage reinforcement part 120-2 is constructed on the one-stage reinforcement part 120-1 constructed through the above process. The two-stage reinforcement part 120-2 is fixed to the support mold 123 by the anchor pin 123d-Geosynthetic fiber 125 mounting and laying-Basic reinforcement stone 121-Reinforced soil 124 made through the installation process Can be.

(S50) Reinforcement completed.

As shown in FIG. 7E, the reinforcement part 120 is constructed in multiple stages according to the design height. In the state of FIG. 7E, since the multi-stage reinforcement part 120 may stand on its own, the stacked front part may be maintained even without constructing the concrete front part 110.

(S60) Concrete front part construction.

In the state of FIG. 7E, the reinforcement 111 is connected to the reinforcement (reinforcement by connecting to the connecting portion 123c of the reinforcement part 120) and installs the formwork M2, and then places concrete in the formwork M2. When the casting of concrete is completed, the formwork M2 is demolded, thereby completing the construction of the reinforced soil RC retaining wall 100. When the formwork (M2) is installed, a steel rod for fixing the formwork (M2) may be installed, and when the concrete is cured, the formwork (M2) may be demoulded by cutting the steel bar, which is used during the construction of an existing concrete structure. Since it is a method, a person skilled in the art can easily carry out.

In the present invention, since the front surface is constructed of reinforced concrete (RC), it may be used alternately. FIG. 8 alternately utilizes the concrete front part 110 wall surface of the reinforcement soil RC retaining wall 100 when the foundation ground is solid enough to build an alternating surface, and supports the bridge deck 200 on the road surface side. One or more steps of the reinforcement part 120 may be pushed backwards to be stepped, and then the bridge top plate 200 may be supported by constructing an “L” type block 210 that supports the bridge top plate 200 at the stepped portion. .

And, Figure 9 is the concrete front portion 110 of the reinforced soil RC retaining wall 100 by using the pile foundation 400 when the foundation ground is not able to build the shift is used alternately.

FIG. 10 is a reinforcement soil constructed after securing the safety for activities by reinforcing the anchor 500 or nailing when using the first-level concrete front wall as a front support plate when the foundation ground is composed of rock and cannot reinforcement. RC retaining wall.

Concrete front portion 110 according to the present invention may be used as a shift, anchor support plate itself without a separate structure or to install a soundproof wall, power pole, etc. on the wall.

The integrated concrete front part 110 integrated with the reinforcement part forms one continuum beam structure supported by a small continuous section (vertical arrangement interval of the reinforcement material), so that the earth pressure acting on the concrete front part 110 compared to the reinforced concrete retaining wall Moments, shear forces, etc. acting on the lower part of the wall and the wall is significantly smaller, and the force that resists external force is greater than that of the general block type reinforced soil retaining wall (see FIGS. 11A and 11B).

1 is a cross-sectional view of a block type reinforced earth retaining wall according to the prior art.

Figure 2 is a cross-sectional view of the reinforced concrete retaining wall is built on a conventional soft ground.

Figure 3 is a state diagram of the construction of the conventional reinforced concrete shift.

4 is a cross-sectional view of the alternating structure generally constructed with reinforcement retaining walls;

Figure 5 is a construction state of the reinforced earth RC retaining wall according to the present invention.

Figure 6 is an exploded perspective view of the reinforcement portion applied to the reinforced soil RC retaining wall according to the present invention.

7a to 7f is a construction process diagram of the reinforced soil RC retaining wall according to the present invention.

Figure 8 is a state of construction used alternating reinforcement soil RC retaining wall according to the present invention in a solid rock and the like.

Figure 9 is a construction state in which reinforcement soil RC retaining wall according to the present invention is used alternately in the soft ground.

Figure 10 is a construction state in which the anchor is reinforced using a concrete front portion as an anchor support plate when the reinforced earth RC retaining wall is composed of a rock foundation foundation according to the present invention.

11a and 11b is a cross-sectional view showing the effect of the reinforced soil RC retaining wall according to the present invention.

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

100: reinforcement retaining wall, 110: concrete front

111: rebar, 120: reinforcement

121: basic reinforcement stone, 122: geotextile

123: support frame, 124: reinforcement soil

Claims (7)

delete Reinforcement 111 is reinforced therein and the concrete front portion 110 to form the front surface of the reinforcement earth retaining wall by pouring concrete; And, Basic reinforcement stone 121, the support frame 123 to induce self-reliance by maintaining the geosynthetic fiber 122 on the surface to be wrapped in the reinforcement soil and wrapped in the reinforcement soil in a predetermined form, the induction of independence It includes a reinforcement portion 120 is constructed in the rear of the concrete front portion, including a reinforcement soil 124 is filled in the rear of the foundation reinforcement, and compacted, The support frame is formed by connecting the reinforcing bar in the longitudinal and horizontal direction, a bottom part 123a, a vertical part 123b extending upward from the bottom part, and a connection part extending forward from the bottom part to connect the reinforcing bar of the concrete front part. Reinforced earth RC retaining wall, characterized in that consisting of (123c).      The reinforced earth RC retaining wall according to claim 2, wherein the geotextile is made of a nonwoven fabric, a composite fabric, and a woven fabric. delete delete delete delete

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