KR20060008561A - Soil reinforcing material for multi-resistance - Google Patents

Abstract

The present invention connects materials having different shapes or materials to each other, and manufactures and applies the ground reinforcement material having increased tensile strength and frictional resistance. Conventional ground stiffeners, such as Soil Nail, Rock Bolt, Earth Anchor, etc. are a single body having the same material and shape, but the ground stiffener according to the present invention is a resistor that differs in shape and material. The chain and the connector are connected in series to have large tensile strength and frictional resistance.

Multi-Resistance, Ground Reinforcement, Resistor, Connector

Description

Soil Reinforcing Material for Multi-Resistance}

1 is a detailed description of an existing anchor,

Figure 2 shows the ultimate load of the general ground reinforcement,

Figure 3 is a simplified to apply the ultimate load of the general ground reinforcement to the design,

Figure 4 shows a resistor and a connector showing the ground reinforcement of the present invention.

5 shows the ultimate load exhibited by the ground reinforcement of the present invention.

Soil Nailing is a reinforcement method using reinforcement. It is a method to reinforce local soils using reinforcement to withstand tensile and shear forces on the cut slope. By inserting reinforcement material into the ground at relatively tight intervals, the overall shear resistance and activity resistance of the ground can be increased to ensure stability of the slope and to suppress the displacement of the ground. In addition, the rock bolt method is a method of increasing rock shear and activity resistance by using reinforcing bars to secure rock slopes or tunnels and to suppress rock displacement.

Earth anchors are installed in the ground to stabilize the structure against excessive stresses, deformations, and displacements, which are hypothetically and permanently generated by applying prestressing forces to anchor cables by fixing both ends of the anchor cable to both the structure and the ground. . According to the settlement base, when it is settled on the soil ground, it is called a soil anchor, and when it is settled on the rock, it is called a rock anchor. The anchor head maintains the prestressing force given to the anchor cable by fixing it to the building using anchorage. The free length portion transfers the prestressing force at the anchor head to the anchor fixture without reducing tension. The anchoring fixture part transmits the prestressing force transmitted from the anchor cable to the surrounding ground reliably through the grout. Examples of hypotheses include large-scale excavation in plane and excavation in the case of irregular shape in planar yarn. Examples of the use of permanent structures include earthquake countermeasures for structures, earthquake decay, slope stability, fall prevention of structures, prevention of floating structures below groundwater level, restraint of foundation structures caused by earthquakes or storms, and structures with excavation pressure. , Tower structures such as transmission towers, and stabilization of the foundation of bridges.

As in Figure 1, the earth anchor is a type of structural member for transmitting the tensile force in the structure to the ground. It consists of a tension portion 11 for transmitting the tension force to the anchor body, an anchor body 12 having a function of transmitting the tension force of the tension portion to the ground, and an anchor head 13 having a role of connecting the anchor to the structure.

 Slope reinforcement method should be applied differently according to soil condition of slope, slope of slope, water condition of slope and surrounding conditions. The slope is made of cancer, and in the section where the joint of the cancer is expected to collapse, a rock bolt and a cut nailing method are used to prevent the collapse of the slope when the cut slope is soil or ripping arm. Both methods are drilled to insert the ground reinforcement. After grouting, fasten the plate to the nail head.

As a method of applying the conventional ground reinforcement to the site, the ground reinforcement is inserted into the inclined hole perforated in the ground, and the surroundings are cemented around with cement grout, and a tensile force is applied to the reinforcement from the outside to fix the ground. As shown in Fig. 2, since both the methods using the above-mentioned ground reinforcement 21 are made of the same shape and material of the material, the load distribution 22 due to this is at the tip of the resistor which is subjected to large frictional resistance. It is very large and the frictional force of the rest of the resistor portion is relatively very small. That is, various ground reinforcement materials, such as soil nails, rock slopes and tunnel lock bolts and earth anchors, which are applied to the actual site, are made of the same material and shape, and according to the characteristics of the ground reinforcement materials, In the case of a tensile anchor, a large force is received only at the tip of the anchor resistor, and in the case of a compression anchor, a large resistance is received only at the bottom of the anchor resistor, and even if the resistor is long, it is hard to receive even large frictional resistance. As shown in Fig. 3, considering that the ultimate resistance of the anchor does not increase in proportion to the anchoring length, when the anchoring length exceeds 3m, the calculated equation is reduced by reducing the allowable frictional resistance to 60% for the excess portion. Giving.

It can be calculated assuming that the frictional force of the resistance of the anchor is distributed evenly.However, as a result of the pull-out test of the actual site, the frictional resistance is concentrated at the tip or the bottom according to the load of the compression anchor. Different from field results,

Therefore, in order to solve the defect that only a part of the tip or the bottom is subjected to a large load according to the characteristics of the ground reinforcement, the reinforcement is continuously divided into a resistor part and a connector part to receive a large shear resistance and tensile strength. Thus, it is possible to increase the stability of permanent structures or temporary structures requiring large frictional resistance or tensile strength and to enjoy economic effects.

In order to solve the shortcomings of general ground stiffeners, in which a large frictional resistance is applied to a part of the upper or lower portion of the resistor depending on the characteristics of the ground stiffeners, by connecting the connecting body connecting the resistors and the resistors in a large frictional resistance It has great tensile strength and frictional resistance. In the load distribution 22 in the form of a general ground reinforcement according to Fig. 2, the load is largely concentrated at a certain portion, and the remaining portion has a very small load that can be supported. However, in the present invention, the improved ground stiffener 51 is divided by overlapping resistors so as to receive a large load for each of the resistors subjected to the force. As a result, the resistance 51 of the resistor increases very much, which is more than the frictional force of the general ground reinforcement.

As shown in FIG. 4, when the ground reinforcement is divided into a resistor 41 and a connector 42 connecting the ground reinforcement, a portion having little frictional resistance is eliminated, and a portion of the resistor that receives a large frictional resistance overlaps. As a result, the frictional resistance of the ground reinforcement becomes very large. That is, by placing a portion of the resistor and the connecting portion that connects the force to receive a large frictional resistance to all connected resistors. In addition, the connector part is composed of a rope, a cable, a chain or a spring so as to bend to sufficiently endure tensile strength and tensile deformation. In addition, since the linkage is ductile, it adapts to the large displacement of the structure, so the displacement of the structure does not lead to destruction, which will be a great help in the stability of the structure.

This technology is to manufacture and field application of ground stiffeners used as a single material, such as anchors, lock bolts, and soy nails, by connecting a resistor and a connector in series to increase ground strength and frictional resistance. . This increases the stability of the structure by applying to various civil engineering and building construction that needs ground reinforcement, it is possible to obtain a cost reduction effect.

Claims (4)

Multi-resistive ground stiffeners characterized by a structure consisting of a single or a plurality of frictional resistors and a connecting body connecting each resistor The multi-resistive ground stiffener according to claim 1, wherein the connecting portion is made of a flexible body that can adapt to large displacement of the structure. 3. The multi-resistive ground stiffener according to claim 2, wherein the flexible body connecting the resistor consists of a file, a chain, a cable, or a spring. 3. The multi-resistive ground stiffener according to claim 2, wherein the connection connecting the resistors is made of a material which is prestressed.

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