KR20070059766A - A soil nailing reinforcement member using wood - Google Patents

Abstract

A soil nailing reinforcement member using wood is provided to have environment-friendly effect and to perform construction work easily by having no necessity for removing a reinforcement member by using a bamboo or a wood bar as a reinforcement member instead of a deformed bar, a steel bar, a steel pipe, etc. The soil nailing reinforcement method using wood comprises the steps of forming a perforated hole(21) on the soil, inserting a bamboo(22) as a reinforcement member into the perforated hole, grouting(23) and fixing with a plate(24), a bolt(25) and a nut(26).

Description

Soil nailing reinforcement using wood {A soil nailing reinforcement member using wood}

1 is a view showing a conventional soil nailing construction method.

2 is a view showing a first embodiment of a soil nailing according to the present invention.

Figure 3 is a view showing a second embodiment of the soil nailing according to the present invention.

The present invention relates to a reinforcing material used in the soil nailing method, more specifically, compared to the construction using a conventional metal reinforcing material is more nature-friendly and does not need to be removed after construction so that the construction process can be facilitated Soil nailing reinforcing material.

In general, the Soil Nailing method drills the soil and inserts reinforcement material, fills the inside of the hole with cement milk, and treats the front with shotcrete to integrate the reinforced soil to separate it from the unreinforced back ground. It is a form of conventional gravity retaining wall.

In the conventional soil nailing method, the reinforcement material, which is mainly resistant to tensile stress, is inserted to increase the overall shear strength of the original ground, to suppress the generated displacement as much as possible, and also to anticipate relaxation during or after excavation work. To limit.

The construction of the Soil Nailing method consists of excavation, drilling, nail insertion, grouting, and surface protection. In the excavation stage, the ground excavation for installing the front guard and reinforcement is basically the same as general ground excavation. Since the excavation surface in Soil Nailing is often used as a main body structure, excavation surface needs to be excavated to the exact position and shape, and the excavation depth that the ground can stand on depending on soil, and the injection grout or shotcrete Considering the curing period, the depth of excavation and the timing of the next excavation should be determined. In general, depending on the ground conditions, but the critical excavation depth is related to the apparent cohesion of the ground, it is preferable to limit the vertical excavation depth to a maximum of 2m. Excavation to the middle between the nail and the nail to be installed, and if there is a sand layer with no adhesive force in the middle, or if there is a soft layer is difficult to self-reliance, it can be solved by inserting a reinforcement or putting a jaw in advance, or using a ready-made panel. have. If part of the excavation surface collapses during excavation, it is effective to put the soil on the sack and pile it on the collapsed portion and spray shotcrete on it.

Next, in the drilling process, a rock drill or a boring machine is used to install the reinforcing material, and most of the fluid is carried out using air (air, water, nisin, cement grout, bentonite). The choice of fluid during drilling is very important in terms of the prevention of wall collapse, and wet drilling should be avoided except in special cases. Impact and rotary perforations can be used independently or in combination of impact and rotational forces, and are most often used for inhomogeneous or variable grounds. Perforation can be carried out immediately after excavation or after shotcrete for ground stability.In case of collapsible soil, it is difficult to reinforce the material or grouting, so use casing or special self-supporting drilling machine such as jet bolt. . After drilling, the inside of the ball must be cleaned. Do not use water except in special cases as the wall may be scoured.

Next, in the step of inserting the reinforcing material, the reinforcing material used for soil nailing, that is, the nail may use a deformed reinforcing bar or other steel bar, etc., the harmful soil or oil of the part attached to the grout should be removed in advance. In addition, nails used in permanent structures should take into account the margin of corrosion or use rust-treated steel.

After the nail is installed, grout it. Normally, the cement milk is grouted into the hole without pressure, and when the casing is installed, it is necessary to remove it carefully so that the empty wall does not collapse before it is completely hardened after the grouting. The grouting should be completely filled inside the hole and should be carried out three to six times as the grouting material penetrates into the surrounding ground. In dry soils, the number of injections is sufficient, and finally, plugged with a stopper, etc., so as not to overflow from the inlet. At least one injection hose is installed and the end of the primary injection hose is located at the bottom of the drilled hole.When the hole length is 10m or more, another hose is reached at about 3/4 of the hole length. Carry out the injection. At the time of injection, the injection hose is drooped to the bottom and carried out from the bottom. When the grout is filled, the hose is gradually removed to the end of the excavated surface. The injection hose should always be below the grout face.

Carry out the first injection until the injection material flows from the bottom of the hole to the inlet, and after every 3-4 hours, perform the second injection, cure enough to obtain sufficient strength, and then perform surface protection. . Shotcrete, ready-made panels, cast-in-place concrete, etc. can be used as front guards to protect the excavation surface. However, shotcrete is generally used in temporary construction. The shotcrete used for surface protection is to adjust the strength and hardening time according to the geological conditions and construction conditions. The construction thickness is generally 7 ~ 15cm, and reinforcement materials such as wire mesh or steel can be used if necessary. Except in special cases, the device for nail installation consists of a metal support plate, bolts and nuts, and the method of hitting shotcrete is to first spray shotcrete, install and bolt the reinforcement, and then split the shotcrete into 2 There is a way to pre-install and spray at one half position of the After that, the drainage facility will be installed.

Figure 1 shows the state of the soil nailing construction according to the conventional soil nailing construction method as described above. Referring to Figure 1a, inserting a steel material such as a reinforcing steel reinforcement (100) as a reinforcing material 100 in the drilling hole so as to be located in the center of the hole using the spacer 101, grouting (102) and then using bolts and nuts, etc. It shows a fixed state. Figure 1b repeats this process to insert a plurality of reinforcing materials in the excavation surface showing the appearance of the nailing construction.

As described above, the nail, that is, the soil body reinforced by the reinforcing material 100 acts as an integrated retaining wall, and can be effectively applied to not only slope stabilization but also an earthquake structure according to the utilization of the underground space. That is, the soil nailing method is used as a retaining wall stand, earth structure, slope reinforcement method.

First of all, the small nailing method has a feature of reinforcing slopes and retaining walls, and it is easy to apply in places with poor construction conditions such as narrow or long slopes because of the reduction of earth work and the simple and compact construction equipment. In addition, the adaptability of nail spacing, length, installation direction, etc. to the change of geological situation and construction conditions is good, and in general, the construction cost is reduced and the surface can be decorated with planting, molding, etc., compared to existing construction methods.

In addition, when used as a wall of mud walls, there are no obstacles such as braces and intermediate piles in the trench, so the efficiency of the equipment is simple and the process is simplified, and the air is shortened. Because it is not a structure to be settled, it is less susceptible to invasion of the global boundary and can remove nails in the future construction, and when using an excavation surface and structure structure as plywood type, it resists buoyancy by reducing earth pressure and connecting structure and nail head. The construction equipment is simple and compact, so it can be installed in narrow places.

As described above, steels such as deformed steel, steel bars, and steel pipes are used as the reinforcing materials used in the conventional soil nailing method, and when the reinforcing materials made of such steels are used, the harmful soil of the grout and the attached portion is used. Oil or oil should be removed beforehand. If corrosion of steel material may affect the stability of structure in the future, coating or antirust treatment should be considered or corrosion thickness should be considered.

Therefore, as described above, when using steel materials such as deformed reinforcing bars and steel pipes as the soil nailing reinforcement materials according to the conventional soil nailing construction method, due to the characteristics of the steel, it is not easy to cut or connect, etc. Depending on the length, it is not easy to adjust to the desired length, it is not easy to handle on the job site, and the effects of steel corrosion must be taken into account. There was a problem that can cause environmental pollution because it causes water pollution.

Due to these problems, while maintaining the strength, easy handling and environmentally friendly reinforcement has been required, the conventional construction method was all to remove after reinforcement made of steel, which is another process in the overall construction process As a result, there was a problem of prolonging the construction period and requiring more labor.

In order to solve the above problems, according to the present invention, the back ground is not reinforced by inserting a reinforcement by drilling the soil, filling the inside of the hole with cement milk, and integrating the reinforced soil by treating the front with shotcrete. Soil nailing reinforcement used for the construction of the soil nailing to form a retaining wall, such as, the soil nailing reinforcement is provided, characterized in that composed of bamboo.

Further, according to the second embodiment of the present invention, the reinforcement is inserted by drilling the soil, filling the inside of the hole with cement milk, and treating the front with shotcrete to integrate the reinforced soil to distinguish it from the unreinforced back ground. Soil nailing construction in the form of a retaining wall, soil nailing reinforcement is provided, characterized in that consisting of a wood bar (wood bar).

Hereinafter, a first embodiment according to the present invention will be described with reference to the drawings.

FIG. 2 is a view illustrating a state in which the nail nailing is constructed according to the first embodiment of the present invention. Referring to FIG. 2, the bamboo 22 is inserted into the drilling hole 21 as a reinforcing material, and grouting 23 is performed. The plate 24, the bolt 25, and the nut 26 were fixed.

According to the above configuration, in the process of inserting the reinforcement after drilling in the earth and sand, instead of using conventional steel such as deformed reinforcing bar or steel pipe as a reinforcing material, bamboo 22 is used as the reinforcing material. At this time, the bamboo 22 is selected to have a certain strength or more depending on the construction conditions, preferably it is preferable to insert one bamboo of one bamboo in one hole, but if the length does not fit when using steel Likewise it can be extended or cut. After the bamboo reinforcement 22 is inserted as described above, the grouting 23 step and the step of fixing the plate 24, the bolt 25, and the nut 26 are continued as in the conventional construction method.

As in the first embodiment of the present invention, by using the bamboo 22 as a reinforcing material, it is easier to handle the material compared to the method using a conventional steel, cutting and extending according to the length of the drilling hole 21 Since this becomes easy and corrosion does not occur as in the case of using steel, there is no contamination of the soil and no problem of contaminants flowing into the groundwater and causing water pollution. Therefore, it is possible to provide more easy to use environmentally friendly nail nail reinforcement, it is possible to construct environmentally friendly nail nailing does not generate contaminants.

In addition, when using a reinforcement made of steel as in the conventional construction method it was necessary to add a process for removing it or to secure an additional site, using the reinforcement according to the present invention does not need to remove the reinforcement, shortening the construction period Can reduce the cost and effort.

The following table shows the mechanical properties of the various materials. As can be seen from Table 1, it can be seen that the tensile strength of bamboo is not significantly different compared with the tensile strength of the other metal materials shown in Table 2. Thus, the bamboo reinforcement according to the present invention can sufficiently replace conventional steel materials.

[Table 1] Mechanical Properties of Non-Metallic Materials (Korea Housing Corporation Civil Design Guidelines)

[Table 2] Mechanical Properties of Metallic Materials (Guideline for Civil Engineering Design of Korea National Housing Corporation)

In addition, the following table shows the main features of the method using a bamboo as in the present invention.

[Table 3] Characteristics of Bamboo Construction Method (2003 Conference on Geotechnical Engineering)

Next, a second embodiment according to the present invention will be described with reference to FIG.

3 is a view illustrating a state in which the soil nailing is constructed according to the second embodiment of the present invention. Referring to FIG. 3, the bamboo 32 is inserted as a reinforcing material in the drilling hole 31 and grouting 33 The plate 34 and the bolt 35 and the nut 36 are fixed.

In the case of the second embodiment according to the present invention, as shown in Fig. 3, a wood bar is used as the reinforcing material without using bamboo as in the first embodiment. Other matters are the same as those of the first embodiment described above, and therefore, the same point is omitted for simplicity.

In the case of the second embodiment according to the present invention, as in the first embodiment, the handling and construction are easier and environmentally friendly than the case of using steel, and thus, the air can be shortened because it does not need to be removed. Is the same, and when it is difficult to use bamboo as in the first embodiment described above, it indicates that it can be replaced with a wood bar having a high tensile strength. In this case, the size and material of the wood bar may be selected according to the needs of construction conditions and the like as in the first embodiment.

So far, the present invention has been described in accordance with the embodiments according to the present invention, but the present invention is not limited only to the above-described embodiments, and according to the design and construction needs within the scope of the present invention. Various changes, modifications, combinations, combinations and partial combinations are possible to those skilled in the art will be apparent.

As described above, according to the first embodiment of the present invention, by using bamboo as a reinforcing material, it is easier to handle the material compared to the method using a conventional steel, it is easy to cut and extend according to the length of the hole .

In addition, since the corrosion does not occur as in the case of using steel, there is no contamination of the soil and the problem that the contaminants flow into the groundwater and cause water pollution does not occur.

Therefore, according to the first embodiment of the present invention, it is possible to provide more easy to use and environmentally friendly soil nailing reinforcement compared to the conventional soil nailing reinforcement, and the construction is easier than the conventional soil nailing construction method It is possible to construct eco-friendly soil nailing without generating pollutants.

In addition, when using a reinforcement made of steel as in the conventional method of nailing construction, it was necessary to add a process for removing it, but when using the bamboo reinforcement according to the first embodiment of the present invention, there is no need to remove the reinforcement The construction period can be shortened, and the cost and effort can be reduced accordingly.

According to the second embodiment according to the present invention, when it is difficult to use bamboo as in the first embodiment described above, it is possible to replace it with a wood bar such as a log, and so on. Compared to the case of use, handling and construction are easier, there is an environment-friendly effect, and thus there is no need to remove it, thereby reducing the air.

Therefore, according to the present invention, it is more easy to use than the conventional soil nailing reinforcement, environmentally friendly, there is no need to remove the construction period, soil nailing reinforcement that can reduce the cost and effort by that It is also easy to install compared to the conventional soil nailing construction method, it is environmentally friendly because it does not generate pollutants, and it is not necessary to remove the reinforcement, so that the construction period can be shortened, and the cost and effort Soil nailing construction method that can reduce the cost is possible.

Claims (4)

Perforate the earth and sand to form holes, Insert a reinforcement into the drilling hole, Fill the inside of the drill hole with cement milk, In the soil nailing reinforcement used in the construction of soil nailing, which is configured to form a retaining wall by distinguishing the back ground that is not reinforced by integrating the reinforced body by integrating the front surface with shotcrete, Said soil nailing reinforcement is a soil nailing reinforcement, characterized in that consisting of bamboo. The method of claim 1, Soil nailing reinforcement is a nail nail reinforcement, characterized in that consisting of a wood bar (wood bar). Forming perforation holes in the soil; Inserting a reinforcement into the drilling hole; Filling the inside of the drill hole with cement milk; In the method of constructing soil nailing comprising the steps of forming the retaining wall by separating the ground from the unreinforced ground by integrating the reinforced soil by treating the front surface with shotcrete, Soil nailing construction method characterized in that the reinforcement is made of bamboo. The method of claim 1, Soil nailing construction method characterized in that the reinforcement is composed of a wood bar (wood bar).

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