KR101041274B1 - Retaining wall grouting structure and method for constructing thereof - Google Patents

Abstract

PURPOSE: A composite type grouting temporary construction structure and a construction method thereof are provided to improve the stability of a structure by forming a cutoff wall on the backside of a sheet pile by grouting. CONSTITUTION: A composite type grouting temporary construction structure comprises: plural H-piles(11) installed to the ground, which includes a soil layer(1c), a weathered rock layer(1b) and a bedrock layer(1a); plural sheet piles(12) installed to the ground to locate on one side of the H-pile; an earth retaining wall formed on the other side where the front part of the H-pile is exposed; and plural cutoff walls(15) formed on one side of the sheet pile to cut off the sheet pile.

Description

Synthetic Grouting Structure Structure and Construction Method of It {RETAINING WALL GROUTING STRUCTURE AND METHOD FOR CONSTRUCTING THEREOF}

The present invention relates to a synthetic grouting temporary structure and its construction method. More specifically, in a synthetic grouting temporary structure composed of a combination of a sheet pile, an H pile provided on the front face of the sheet pile, and an earth wall, for example, to form a retaining wall, The present invention relates to a synthetic grouting structure and its construction method to improve the stability of the structure by forming the order wall on the rear surface.

In general, in order to construct a foundation of a building, a bridge, a subway, an underground roadway, a basement or a concrete wall at a construction site, after the ground is excavated, the earthquake construction is performed to prevent the collapse of the excavated surface by the earth pressure and the penetration of water. Doing. These earthquake constructions are divided into concrete permanent earthquake construction, which is integrally formed on the excavated pit excavation surface, and a temporary earthquake construction, which is installed on the pit excavation surface only during the excavation work, and then dismantled when the construction is completed.

Temporary earthquake construction has been widely used for a long time, and the earthen plate method has been applied. This wood earthen plate method has a poor function of the wood and water can leak between the earthen boards. There was a problem that requires a lot of personnel and time for installation.

In order to solve the problem of the wood soil plate method, recently, the sheet pile method using a sheet pile as a soil barrier is used.

The sheet pile method is excellent in strength and durability because the sheet pile is used as a cast steel material, so that it can fulfill the role of the order wall as a continuous wall rigid body. It is excellent and is mainly used for water barrier construction and earth structures such as order walls, embankment reinforcement works when building structures below the earth's surface.

On the other hand, among the construction method of the earthenware, using a temporary facility in combination with the sheet pile, H pile, earth wall, and the like, a construction method that allows the construction can be carried out within the planned construction period even in the rock layer which cannot be directly driven construction.

1A to 1D sequentially illustrate the construction method of the retaining wall structure according to the general technique. Here, the ground 1 shown in FIG. 1 in which the construction of the retaining wall is constructed includes a rock layer 1a made of soft rock or hard rock in the ground, a weathered rock layer 1b on the rock layer 1a, and a weathered rock layer 1b. It is a general ground comprised of the earth and sand layer 1c.

First, as shown in FIG. 1A, a perforation is performed to the rock layer 1a in the ground 1, and then the H pile 11 is inserted into the perforated hole.

Next, as shown in FIG. 1B, a plurality of sheet piles 12 are driven and driven to one side of the H file 11 to the weathered rock layer 1b in the ground 1.

Then, as shown in FIG. 1C, the inside of the H pile 11 is excavated to expose the H pile 11, and the strip 13 and the reinforcement 16 are welded to the exposed H pile 11 by welding. Install.

Then, as shown in Fig. 1D, one side of the H pile 11 is exposed by the break of the ground 1, and the ground 1 between the H piles 11 is broken, and then adjacent H The earth walls 14 are provided by sandwiching and stacking a plurality of earth members 14a (earth plates) between the piles 11. At this time, the earth member (14a) is installed by inserting the end in the transverse direction in the inner space formed between the flanges of both the H pile (11).

Then, the weathered rock layer 1b is completely excavated while reinforcing the portion of the weathered rock with the risk of falling rocks with the earth member 14a to finish the trench on the ground 1.

However, in the conventional wall structure, the weathered rock layer at the bottom of the sheet pile due to the change in pressure generated in the soil layer when the topography change or loss of the soil layer in contact with the rear surface of the sheet pile due to the water level occurs. Water leakage occurs in (1b), and the joints between the sheet piles are spaced apart, resulting in a problem of weakening the stiffness of the structure due to inflow of soil or inflow of groundwater.

The present invention has been made in view of the above circumstances, and in the composite grouting provisional structure composed of a combination of a sheet pile, an H pile provided on the front surface of the sheet pile, and an earth wall, the rear surface of the sheet pile As the order wall is formed through grouting, it is an object of the present invention to provide a synthetic grouting temporary structural structure and a construction method thereof that improve the stability of the structure.

Specifically, by forming an order wall by grouting on the ground boundary surface with respect to the rear surface of the sheet pile inserted through the ground boundary surface (for example, the interface between the soil layer 1c and the weathered rock layer 1b). It is an object of the present invention to provide a synthetic grouting provision structure and a construction method thereof to improve the stability of the structure.

Moreover, by inserting the insertion depth of the order wall deeper than the insertion depth of the sheet pile, the synthetic grouting to block the water inflow to the lower end of the sheet pile, and thus prevent the ground weakening of the lower portion of the sheet pile by the water inflow It is an object of the present invention to provide a temporary construction structure and a construction method thereof.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the precise form disclosed. There will be.

Synthetic grouting provisional structure according to a first embodiment of the present invention for achieving the above object comprises a plurality of H piles in the ground consisting of a plurality of layers; A plurality of sheet piles located on one side of the H file and being joined to the ground; An earth wall provided on the other side of the H pile exposed by the excavation; And an order wall formed by grouting in a predetermined section from a position deeper than a depth of the infiltrating sheet pile to the inside of the plurality of sheet piles corresponding to the plurality of H piles to a specific position inside the sheet pile. .
In this case, the order wall may be formed across the boundary of the plurality of layers of the ground consisting of the plurality of layers inside the plurality of sheet piles.
In addition, the ground may be composed of a soil layer, a weathered rock layer and a rock layer, wherein the H pile is entered from the soil layer to the rock layer, the sheet pile is entered from the soil layer to the weathered rock layer, and the order wall is of the sheet pile On one side may be formed over the soil layer and the weathered rock layer.
In particular, the order wall may have an upper portion located in the soil layer and a lower portion located in the weathered rock layer.

According to a second embodiment of the present invention, there is provided a method of constructing a retaining wall, comprising: placing a plurality of H piles in a ground having a plurality of layers; Inserting a plurality of sheet piles into the ground at one side of the H file; Perforating to a position deeper than a depth of the infiltrated sheet pile inside the sheet pile corresponding to the plurality of H piles; Injecting an injection tube through a perforation to a specific position inside the sheet pile; And raising the injection tube while injecting the grout material through the injection tube. When the injection tube reaches a specific position inside the sheet pile, the injection of the grout material is terminated to form a water barrier wall. Deviating from the perforation.
In addition, the earth wall may be further formed on the other side of the H pile exposed by the excavation.

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According to the synthetic grouting provision structure and the construction method thereof according to the present invention, at the rear face of the sheet pile or more specifically at the ground interface (for example, the interface between the soil layer 1c and the weathered rock layer 1b). By supporting the rear face of the sheet pile with the order wall, the rigidity of the synthetic grouting temporary structure can be maintained even if the topographical change, loss or groundwater outflow of the soil layer in contact with the rear face of the sheet pile occurs.

1a to 1d is a perspective view showing the construction sequence of the synthetic grouting provision structure to configure the retaining wall according to the general technique,
Figure 2a to 2e is a perspective view showing the construction sequence of the synthetic grouting provisional structure according to the invention,
3A to 3E are schematic cross-sectional views showing a state in which the order wall is formed at the rear of the sheet pile according to the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various ways, all without departing from the spirit or scope of the present invention.

In addition, although the ground 1 is described as being comprised of the soil layer 1c, the weathered rock layer 1b, and the rock layer 1a in the following example, the rock layer which consists of soft rock or hard rock which is the lowest layer into which the said H pile is inserted ( It is apparent that the present invention can also be applied to other ground in which a plurality of layers are provided on 1a). In this case, it is to be considered that the sheet pile is basically entered over one of a plurality of interlayer boundary surfaces, and the order wall is formed deeper than the end of the sheet pile.

[Example]

2A to 2E are perspective views showing the construction sequence of the synthetic grouting provisional structure according to the present invention. In FIG. 2, the same parts as in FIG. 1 will be described with the same reference numerals.

Synthetic grouting structure according to an embodiment of the present invention, as shown in Figure 2e, a plurality of H piles that are embedded in the ground comprising a soil layer (1c), weathered rock layer (1b) and rock layer (1a) ( 11), a plurality of sheet piles 12 entering the ground so as to be located on one side (rear) of the H pile 11, and an earth wall provided on the other side (front) where the front portion of the H pile 11 is exposed. 14 and a plurality of order walls 15 provided on one side (rear wall) of the sheet pile to order the sheet pile 12.

Here, the plurality of H piles 11 are installed so as to enter the ground at a predetermined interval to be embedded into the rock layer 1a, and to be inserted into the rock layer 1a by being inserted into a hole drilled up to the rock layer 1a in advance. Can be.

In addition, a plurality of the sheet pile 12 is embedded in the ground so as to be located on one side (rear) of the H pile 11, as in the present embodiment is directly supported by the H pile 11, or a separate support The member may be used to be supported by the spaced H file 11. On the other hand, the plurality of sheet piles 12 are coupled to each other along the arrangement direction of the H pile 11 are arranged in a plurality to form a vertical wall with respect to the ground.

Here, the earth wall 14 may be provided on an excavation surface to which the front portion of the H pile 11 is exposed. At this time, the surface of the excavation surface can be even before the formation of the earth wall (14).

In addition, the earth wall 14 may be formed using the earth member 14a on an excavation surface to which the front portion of the H pile 11 is exposed. That is, as described above, the earth member 14a is sandwiched between the flanges of both adjacent H piles 11, and the space formed in the inner space of the H pile 11 and the rear side of the earth member 14a is a base paper. It can form in a state.

In addition, the earth wall 14 may be formed of shotcrete in a state in which the earth member is installed or removed, and a reinforcing material such as reinforcing bars or wire mesh is disposed on the excavation surface.

Here, the order wall 15 is formed in the ground so as to be located on one side (rear surface) of the sheet pile 12, as in the embodiment of the present invention is formed so as to directly support the sheet pile 12, or The sheet pile 12 may be formed to be spaced apart from the sheet pile 12 by a predetermined distance.

The construction method of the synthetic grouting provisional structure according to the present invention having the above configuration will be described in detail as follows. As shown in FIGS. 2A to 2E, the synthetic grouting provisional structure according to the present invention includes the steps of placing the H pile 11 and the sheet pile 12 into the ground, and the rear portion of the sheet pile 12. And performing order grouting, exposing the front portion of the H pile 11, and forming the earth wall 14 on the front portion of the H pile.

First, as shown in FIG. 2A, a plurality of H piles 11 are inserted into the ground at intervals. For this purpose, a plurality of holes (not shown) are drilled in advance to the rock layer 1a. The H file 11 may be inserted into the perforated hole to allow access to the rock in the ground. Accordingly, the H pile 11 is firmly supported by the rock layer 1a.

As shown in FIG. 2B, when the H file 11 is finished entering, the sheet file 12 is entered into the ground by a method such as driving such that the sheet file 12 is located on one side of the H file 11. do. At this time, it is preferable to allow the sheet pile 12 to be inserted to a depth of 0.5m of the weathered rock layer 1b, and the sheet pile 12 is arranged to be engaged with each other so as to extend along the arrangement direction of the H pile 11, The front face is supported by the H pile to form a wall. In addition, the sheet pile 12 may be directly supported by contacting the H file 11 or may be supported by the H file 11 through a separate member.

In addition, as shown in Figure 2c, after a plurality of perforations along the rear surface of the sheet pile 12, the grout material consisting of a resin (resin), cement fixing agent, cement milk and grouting chemical solution is injected to a predetermined height to fix Order grouting.

Preferably, as the sheet pile 12 is approached to a depth of 0.5m of the weathered rock layer 1b, the drilling for the order grouting is performed to a depth of 1m in the weathered rock layer 1b, and the grout material is applied to the weathered rock layer 1b. It is injected to the height of 1m from the boundary surface of the soil layer 1c. Here, the depth of drilling for order grouting for the weathered rock layer 1b may be set to various depths if it is formed only deeper than the indentation depth of the sheet pile 12.

Accordingly, the order wall 15 supporting the rear surface of the sheet pile 12 is installed at a height of 2 m, and is formed at a height of 1 m from the boundary surface toward the soil layer 1c to order the rear end portion of the sheet pile. Support. In addition, the order wall 15 is formed 0.5m deeper than the end of the sheet pile toward the weathered rock layer 1b from the boundary surface, and blocks water from entering the lower end of the sheet pile. Therefore, the ground weakening of the lower end of the sheet pile is prevented (that is, the supporting structure of the sheet pile is firm).

According to this order grouting, the order wall 15 on which the grout material is solidified is formed at a predetermined height, for example, 2 m high, over the interface between the soil layer 1c and the weathered rock layer 1b, thereby forming the plurality of sheet piles ( 12) is ordered and supported from the rear face.

On the other hand, in the order grouting according to an example, after drilling from the soil layer 1c to the weathered rock layer 1b on the rear surface of the sheet pile 12, inserting an injection tube, and mixing cement and sodium silicate, After the ash is injected, and then the completion grout material is injected, the perforation is embedded.

In addition, another example of the grouting method for installing the order wall 15 of a predetermined height is, after drilling at a predetermined depth from the soil layer 1c to the weathered rock layer 1b on the rear surface of the sheet pile 12 (for example, , After drilling deeper than the depth of incidence of the sheet pile), inserting the injection tube to the lower portion of the perforation, and injecting the grout material while winding the injection tube with a predetermined winding means, for example, When the injection pipe rises about 2m, the height of the order wall 15, the injection of the grout material through the injection pipe is terminated. Subsequently, by removing the injection tube after the injection of the grout material is completed from the perforation, an order wall having a predetermined height, for example, about 2 m, can be formed on the rear surface of the sheet pile 12.

In addition, another example of the grouting method for installing the order wall 15 in a plurality of places is, after the perforation to the predetermined depth from the soil layer 1c to the weathered rock layer 1b on the rear surface of the sheet pile 12 (for example, , After drilling deeper than the depth of incidence of the sheet pile), inserting the injection tube to the lower portion of the perforation, and injecting the grout material while winding the injection tube with a predetermined winding means, for example, When the injection tube rises a predetermined height, the process of terminating the injection of the grout material through the injection tube, raising the injection tube while filling the perforation, and repeatedly increasing the injection tube while injecting the grout material through the injection tube do. Subsequently, a plurality of order wall can be formed in the rear surface of the sheet pile 12 by releasing the said injection pipe from which the grout material injection is complete | finished from a perforation.

On the other hand, the height of the reinforcing layer can be variously adjusted while adjusting the lift of the injection pipe and the injection amount of the grout material through the injection pipe.

Here, the grouting is preferably performed on the entire rear surface of the plurality of sheet piles 12 or only on the rear surface (some sections) of some sheet piles 12. Further, a plurality of locations may be randomly performed along the height of the rear face of the sheet pile 12. In addition, the height of the order wall 15 may be variously set with respect to the rear surface of each sheet pile 12.

On the other hand, in the figure, although the order wall 15 is shown to be formed between the soil layer 1c and the weathered rock layer 1b, the entire rear surface of the sheet pile 12 inserted into the ground by grouting as necessary. It may be formed in various ways.

Specifically, as shown in FIG. 3A schematically showing a state in which the order wall 15 is installed on the rear surface of the sheet pile 12, on the rear surface of the sheet pile 12, the soil layer 1c and the weathered rock layer The order wall 15a may be provided at the interface over (1b). That is, one end of the order wall 15a is located in the soil layer 1c, and the other end is located in the weathered rock layer 1b.

In addition, as shown in FIG. 3B, on the rear surface of the sheet pile 12, an order wall 15b may be provided over the entire soil layer 1c and the interface between the soil layer 1c and the weathered rock layer 1b. . That is, one end of the order wall 15b extends to the upper end (surface) of the soil layer 1c, and the other end is located in the weathered rock layer 1b.

In this case, the entire sheet pile 12 inserted into the ground can be supported by the order wall 15b along the vertical direction (the depth direction of the ground).

In addition, as shown in FIG. 3C, on the rear surface of the sheet pile 12, an order wall 15c may be provided on the boundary surface between the weathered rock layer 1b and the soil layer 1c and the weathered rock layer 1b. That is, one end of the order wall 15c is located in the soil layer 1c, and the other end extends to the lower end of the weathered rock layer 1b (the boundary between the weathered rock layer 1b and the rock layer 1a).

In this case, since the moisture that may flow into the lower end of the sheet pile through the weathered rock layer 1b is completely blocked, the ground weakening of the lower portion of the sheet pile is prevented (that is, the supporting structure of the sheet pile becomes more firm).

In addition, as shown in FIG. 3D, on the rear surface of the sheet pile 12, the order wall 15d is provided from the soil layer 1c to the weathered rock layer 1b over the entire soil layer 1c and the entire weathered rock layer 1b. Can be. That is, one end of the order wall 15d extends to the upper end of the soil layer 1c, and the other end extends to the lower end of the weathered rock layer 1b.

In this case, the sheet pile 12 inserted into the ground is supported in the vertical direction (the depth direction of the ground), and at the same time, it completely blocks moisture that may flow into the lower end of the sheet pile through the weathered rock layer 1b. This will prevent the ground from weakening at the bottom of the pile.

In addition, a plurality of order walls may be provided at random on the rear surface of the sheet pile 12 along the height. That is, as shown in FIG. 3E, for example, the order wall 15e is provided at the interface between the earth and sand layer 1c and the weathered rock layer 1b, and the order wall 15e is respectively provided on the earth and sand layer 1c and the weathered rock layer 1b. Can be installed.

In this case, when the entrance and grouting of the H file 11 and the sheet file 12 are finished, the front part of the H file 11 is exposed, and the step of exposing the front part of the H file 11 may include a sheet file ( 12) may include excavating the front surface of the H pile 11 to be exposed together, and drilling a rock to expose the front portion of the H pile 11.

As shown in FIG. 2D, when the order wall 15 is formed by grouting, one side of the sheet pile 12 is exposed to the H pile 11 to be exposed to be positioned on one side of the sheet pile 12. Remove the earth and sand to be. Subsequently, the band 13 and the reinforcing material 16 for reinforcement can be provided in the H file 11.

As shown in FIG. 2E, upon completion of the excavation for the exposure of the sheet pile 12 and the H pile 11, the earth wall 14 is provided in the front part of the H pile 11 by using the earth member 14a. do.

This earth wall 14 is formed by stacking a plurality of earth members 14a stacked over the adjacent H piles 11.

The earth wall 14 may be formed of shotcrete in a state in which reinforcing materials such as reinforcing bars or wire meshes are disposed on the excavation surface.

Then, when the earth wall 14 is formed, the weathered rock layer 1b is completely excavated to finish the trench for the ground 1.

As described above, the synthetic grouting provisional structure and construction method thereof according to the present invention have been described with reference to the accompanying drawings, but various modifications and changes may be made without departing from the spirit of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims below and equivalents thereof.

11: H file, 12: sheet file,
13: strip, 14: earth wall,
15: order wall, 16: reinforcement material,
1a: soft rock or hard rock, 1b: weathered rock, 1c: soil layer.

Claims (15)

A plurality of H piles entered into the ground composed of a plurality of layers;
A plurality of sheet piles located on one side of the H file and being joined to the ground;
An earth wall provided on the other side of the H pile exposed by the excavation; And
And an order wall formed by grouting in a predetermined section from a position deeper than the depth of the seated sheet pile to the inside of the plurality of sheet piles corresponding to the plurality of H piles to a specific position inside the sheet pile. Characterized by synthetic grouting provisional structure. The method of claim 1, wherein the order wall is
Synthetic grouting provisional structure, characterized in that formed on the inner side of the plurality of sheet piles across the boundary of the plurality of layers of the ground consisting of the plurality of layers. The method of claim 1, wherein the ground
Synthetic grouting temporary structure comprising a soil layer, weathered rock layer and rock layer. The method of claim 3, wherein
The H pile is incorporated from the soil layer to the rock layer,
The sheet pile is incorporated from the soil layer to the weathered rock layer,
The order wall is a synthetic grouting provisional structure, characterized in that formed over the soil layer and the weathered rock layer on one side of the sheet pile.
The method of claim 4, wherein
The order wall is a synthetic grouting structure, characterized in that the upper portion is located in the soil layer, the lower portion is located in the weathered rock layer.
delete delete delete delete delete delete Incorporating a plurality of H files into a ground composed of a plurality of layers;
Inserting a plurality of sheet piles into the ground at one side of the H file;
Perforating to a position deeper than a depth of the infiltrated sheet pile inside the sheet pile corresponding to the plurality of H piles;
Injecting an injection tube through a perforation to a specific position inside the sheet pile; And
The injection tube is raised while injecting the grout material through the injection tube, and when the injection tube reaches a specific position inside the sheet pile, the injection of the grout material is terminated to form a water barrier wall, and the injection tube is drilled. Separation wall construction method comprising the step of separating from.
The method of claim 12,
The earth wall construction method further comprises the step of forming a earth wall on the other side of the H file exposed by excavation.
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