KR101877361B1 - Method for arranging strands considering the length of compression and distribution type ground anchor and compression and distribution type permenent anchor applied the same - Google Patents

Abstract

The method of arranging the tensile material considering the loudness of the load-dispersing type ground anchor body is as follows. Considering the burden load between a plurality of tensile materials generated when pulling with a general hollow type tensile machine, It is possible to equalize the load imposed on each tensile material by adjusting the interval between the inner bottoms to which the tensile material is connected by calculating the louder volume due to the difference in thickness. And a load-dispersing type ground anchor body to which the present invention is applied, it is possible to perform simultaneous pulling by a general hollow tensioner without using an expensive load-dispersing type tensioner, thereby reducing the construction cost and simplifying the construction step, There is an advantage that it can be promoted.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of arranging a tensile material in consideration of the sound volume of a load anisotropic ground anchor body and a load anchoring permanent anchor body using the same.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground anchor for stabilizing a ground such as a retaining wall and a slope by applying an anchor force to a tensile material. More specifically, the present invention relates to a ground anchor, The present invention relates to a method of arranging a tensile material in consideration of the loudness of a load distribution type ground anchor body capable of simultaneous tensioning without considering a separate tension method in consideration of the difference in the loud sound volume generated in the tensile material as a ground anchor body and a load dispersing type ground anchor body .

Generally, in the ground anchor method, a perforation is made in the earth retaining wall instead of a bracket to fix the civil engineering or building structure to the ground, and the grout is filled with the insertion of the tensile material and cured, It is a method of supporting earth pressure. These ground anchoring methods are applied to the ground guard anchor, the ground anchor earthed wall, the base of the transmission tower, the buoyant anchor of the underground structure of the dam, and the slope reinforcement.

The anchor body used in the ground anchor method is designed to fix a high strength tensile material such as a PC strand in both the structure and the ground in civil engineering sites and to provide a prestress to the structure from excessive stresses, Stabilize.

The anchors used in the ground anchor method are classified into permanent anchors and temporary anchors according to the period of use. The anchors are classified into permanent anchors, temporary anchors, compression anchors, tensile anchors, and compression anchors, It can be classified into load distribution type anchors. Each anchor body classified according to the support type combines a plurality of single tensile materials to secure the support force by the tensile force by the main surface friction of the grout.

The tensile type anchors have advantages in that they have abundant research results and construction results. However, there are disadvantages such as tensile cracks in grout and creep due to load concentration and progressive fracture phenomenon, , The load loss due to creep is small, but high - strength grout should be used. In case of relatively weak ground, anchor force can not be secured.

Recently, load anchoring anchors have been developed and used to compensate for the disadvantages of tensile and compressive anchors. Because the load is dispersed and distributed in various parts of the anchor body, the anchor force is less influenced by the grout strength and the anchor force can be secured even in the relatively weak ground, and it is possible to exert a high load Feature.

FIG. 1 shows a load distribution type compression type anchor according to the prior art. The tensile material 11 in the free length section and the tensile material 13 in the fixing length section are connected to each other through the internal fixing agent 20 as shown in FIG. .

The above-described load-dispersing type composite anchor maximizes the tensile dispersion effect in the free length section and the tensile force in the bonded length section. The tensile type anchor or the compressive force anchor A large anchor force can be secured.

However, when the load-dispersing composite anchor is tensioned by using a general hollow tensioner having a single cylinder structure, as shown in FIG. 2, the tensile material having a short length of the tensile material has a high load ratio and the length of the tensile material is long The load ratio of the tensile material becomes small.

Therefore, as the load of the tensile material increases, the possibility that the short-length tensile material first breaks becomes higher. Therefore, a tensioning method that corrects the difference in the loudness of the tensile material according to the interval of the inner-

One of the methods for correcting the loudness difference of the tensile material is a method of stretching using a load-balancing type stretcher as shown in Fig. A load-dispersive tensile machine refers to a tensile machine in which one tensile cylinder corresponds to one tensile material, for example, a tensile machine in which four cylinders correspond to four tensile materials. This has a structure in which the same cross-sectional area and the same pressure can be applied so that the same load can be applied to each tensile material.

Another method of correcting the loudness difference of the tensile material is a method of making the load acting on each tensile material equal through the ordinary hollow tensioning machine by previously generating displacements corresponding to the loudness difference according to the interval between the inner bottoms.

That is, as a method of predicting and varying the load that individually burdens the tensile material by previously calculating the difference in volume between a plurality of inner bottom bodies, The tensile members connected to the second long inner bottom body are similarly stretched by the same amount of tension, and the whole tensile members are pulled up to the anchor fixing force. Thus, the load is equally applied to each of the tensile members by using a general hollow type stretcher .

However, the conventional load anchoring composite anchors have the following problems.

Firstly, the method of applying using the load-dispersive type tensioner has a problem that the total construction cost is increased because an expensive load-balancing type tensioner must be purchased separately.

On the other hand, the method of using a general hollow tensioning machine requires a separate tension correction for each tensile material, thereby increasing the construction period and complicating the construction. Especially, it is difficult to identify the tensile material or the tensile material The load on the short tensile material is higher than that of the conventional tensile material, so that the stability is greatly reduced.

Korean Patent Publication No. 10-2013-0113563 (published October 16, 2013) Korean Patent Publication No. 10-2005-0005345 (published on January 13, 2005)

It is an object of the present invention to simplify the construction step and increase the fixation effect while using a general hollow tensioner without using an expensive load-dispersive tensioner.

According to an aspect of the present invention, there is provided a method of arranging a plurality of tensile members of a load-dispersed ground anchor body, the method comprising the steps of: The thickness of the tensile material or the modulus of elasticity of the tensile material is varied according to the length of each tensile material to correspond to the load rate caused by the length difference of the tensile material, It is preferable to correct the gap between the inner and lower bodies to be connected.

The tensile material of the present invention is preferably changed such that the unit area increases as the length of the tensile material increases and decreases as the length of the tensile material decreases.

It is preferable that the tensile material of the present invention is changed so that the elastic modulus increases as the length of the tensile material increases and decreases as the length of the tensile material decreases.

The tensile material of the present invention is preferably changed to increase the unit area or the elastic modulus when the length of the tensile material increases, and to reduce the unit area or the elastic modulus when the length of the tensile material decreases.

It is preferable that the tensile material arranging method considering the sound volume of the load-dispersed ground anchor body of the present invention is arranged so that the interval between the inner bottom bodies becomes longer as the difference in thickness between the plurality of tensile materials increases.

Interval (S) between the lower body in the present invention is _{S = (△ L N -N +} 1) × E × A / P (△ L N -N + 1 = △ L N - △ L N + 1, △ L N _{= PL N / EA N, △} L N +1 = PL N +1 / EA N +1, △ L: increased volume, P: load loading on the anchor head, L: length of the anchor distal portions, E: elastic modulus of tension member , A: tensile material unit area, N: Nth tensile material, N + 1: Nth tensile material, and N + 1th tensile material having a longer length).

It is preferable that the load-dispersed ground anchor body of the present invention is provided with a tensile material by the method of arranging the tensile material.

According to the method of arranging the tensile material in consideration of the sound volume of the load-dispersed ground anchor body according to the present invention and the load-dispersed ground anchor body using the same, the length and thickness of the tensile material are corrected by considering the volume of each tensile material. Therefore, it is possible to simultaneously perform tensioning by a general hollow tensioner without using an expensive load-dispersive tensioner. Therefore, the construction cost can be reduced, and the construction step can be simplified to enhance the fixing effect of the anchor body.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a load-dispersing type ground anchor body according to the prior art; FIG.
Fig. 2 is a stress distribution diagram showing the stress state of a tensile material obtained by pulling a load-dispersed ground anchor body according to Fig.
Fig. 3 is a stress distribution diagram showing the stress state of a tensile material obtained by pulling the load-dispersed ground anchor body according to Fig. 1 by a load-dispersing type stretching machine.
Fig. 4 is a construction diagram showing a construction procedure for individually tensioning a load-dispersed ground anchor body according to Fig. 1 by a general heavy-duty tensioner. Fig.
FIG. 5 is a view showing a load distribution type ground anchor body to which a method of arranging a tensile material considering the sound volume of a load distribution type ground anchor body according to the present invention is applied.

Further objects, features and advantages of the present invention will become more apparent from the following detailed description and the accompanying drawings.

Before describing the present invention, the present invention should not be construed as limited to the embodiment (s) described below, but may be embodied in various other forms. The following embodiment (s) are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

When an element is described as being placed on or connected to another element or layer, the element may be directly disposed or connected to the other element, and other elements or layers may be placed therebetween It is possible. Alternatively, if one element is described as being placed directly on or connected to another element, there can be no other element between them. The terms first, second, third, etc. may be used to describe various items such as various elements, compositions, regions, layers and / or portions, but the items are not limited by these terms .

The terminology used herein is for the purpose of describing the particular embodiment (s) only and is not intended to be limiting of the invention. Furthermore, all terms including technical and scientific terms have the same meaning as will be understood by those skilled in the art having ordinary skill in the art, unless otherwise specified.

These terms, such as those defined in conventional dictionaries, shall be construed to have meanings consistent with their meanings in the context of the related art and the description of the present invention, and are to be interpreted as being ideally or externally grossly intuitive It will not be interpreted.

The embodiment (s) of the present invention are described with reference to cross-sectional illustrations which are schematic illustrations of the ideal embodiment (s) of the present invention. Accordingly, changes from the shapes of the illustrations, such as changes in manufacturing methods and / or tolerances, are those that can be expected. Accordingly, the embodiment (s) of the present invention are not to be construed as limited to the specific shapes of the regions illustrated by way of illustration, but rather to include deviations in shapes, and the regions described in the Figures are entirely schematic, Are not intended to illustrate the exact shape of the area and are not intended to limit the scope of the invention.

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

In the method of arranging the tensile material in consideration of the sound volume of the load-dispersed ground anchor body according to the present invention, the thickness of the tensile material and the modulus of elasticity of the tensile material are varied according to the length of the tensile material corresponding to the load- And is configured to readjust the interval of the inner bottom body to which the tensile material is connected, reflecting the difference in the loudness of the tensile material having different thicknesses or different elastic moduli.

FIG. 5 shows a preferred embodiment of a method of arranging a tensile material in consideration of the sound volume of a load-dispersed ground anchor body according to the present invention and a load-dispersed ground anchor body to which the method is applied.

The load distribution type ground anchor body 100 to which the anchor body arranging method considering the sound volume of the load distribution type ground anchor body according to the present invention is applied is characterized in that each tensile material is divided into a first tensile material 101 and a second tensile material 103 ), And a third tensile material 105, but the present invention is not limited thereto and may include one or more tensile materials.

The tensile materials 101, 103, and 105 have a unit area A or a modulus of elasticity E according to different lengths. Generally, when tensioning an anchor using a general hollow tensioner, the tensile material shorter than a long tensile material is liable to be burdened by a difference in the length of the tensile material.

Therefore, the unit area A and the elastic modulus E of the tensile material can be adjusted in advance so as to have the same elongation volume as the length of the tensile material 101, 103, or 105 changes.

First, in relation to the unit area A of the tensile material, it is preferable that the unit area A of the tensile material is relatively large in order to maintain the same amount of elongation as the length of the tensile material is longer. 5, since the length from the first tensile material 101 to the third tensile material 105 becomes shorter, the unit area becomes smaller as the distance from the first tensile material 101 to the third tensile material 105 increases.

Regarding the modulus of elasticity (E) of the tensile material, it is preferable that the modulus of elasticity (E) of the tensile material is relatively large in order to maintain the same amount of elongation as the length of the tensile material is longer. Since the elastic modulus (E) of the tensile material is often supplied by the steel maker in the manufacturing process, the length and the unit area of the tensile material may be designed so that the volume can be easily changed according to the standard size of the elastic modulus have.

In addition, the volume can be adjusted continuously considering the total area (A) and elastic modulus (E) of the tensile material. The unit area (A) and the elastic modulus (E) can be synthetically changed according to the change in the length of the tensile material, so that the volume can be made constant.

A tensile material having a large unit area (A) or a large elastic modulus (E) has a larger ultimate load or a yield load than a tensile material having a small unit area (A) or a small elastic modulus (E). By using this point, it is possible to realize an effective load sharing considering the ground distribution by imposing a higher load on a tensile material having a large unit area (A) or a large elastic modulus (E), thereby reducing the construction cost .

The method of calculating the loudness difference of plural tensile materials is as follows.

A first length of L _1, the unit area of the tension member 101 is A _1, the Young's modulus as E _1, and the second tension member the length of the (103) L _2, unit area of A _2, the modulus of elasticity E ₂ d , The length of the third tensile material 105 is L ₃ , the unit area is A ₃ , and the elastic modulus is E ₃ .

Then, the volume calculation for each tensile material is as shown in Equation 1 below.

[Equation 1]

ΔL = PL / EA

(L: volume, P: load on the head of anchor, L: free length of anchor, E: elastic modulus of tensile material, A: tensile material unit area)

According to Equation (1), in order to make the volume (DELTA L) equal to the length change (L) of the tensile material, the unit area (A) of the tensile material or the modulus of elasticity ) Should increase as well.

Then, the loud volume of the first tensile material 101 and the second tensile material 103 is calculated by the following equation (1).

* First tensile material:? L ₁ = PL ₁ / EA ₁

* Second tensile material:? L ₂ = PL ₂ / EA ₂

Therefore, the loudness difference DELTA L < _1-2 > between the first tensile material and the second tensile material is expressed by the following equation (2).

&Quot; (2) "

ΔL _1-2 = ΔL ₁ - ΔL ₂

If the free length of the anchor and the load are the same as in the above calculation, the difference of ΔL _1-2 is caused by the difference in unit area between the tensile material of the tensile material generated in the tensile material having different unit area, The difference in elastic modulus of the tensile material of the elongation volume generated in the tensile material having the different elastic modulus causes a difference of DELTA L < ₂ >

Therefore, the inter-lower body interval S due to the difference in volume is always calculated as shown in Equation 3 below.

&Quot; (3) "

S = (DELTA L < _1-2 >) x E x A / P

Accordingly, the interval between the first tensile material 101 and the second tensile material 103 can be readjusted by applying the inter-lower body interval S calculated by Equation (3).

Similarly, the second tensile member 103 and the third tensile member 105 can be adjusted by calculating the inter-lower body interval S by the same principle.

As can be seen from the equations (1) to (3), the greater the difference in thickness between the first tensile material 101 and the second tensile material 103 or between the second tensile material 103 and the third tensile material 105, And the length of the inter-lower body interval (S) due to the volume is also increased.

As described above, according to the lengths of the respective tensile materials, they are set to have different unit areas or different elastic moduli, and the interval between the inner bottoms is adjusted by applying the difference of the loudness according to the different unit area, The load-anchoring anchor can be applied by pulling.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. will be.

Description of the Related Art [0002]
100: load-dispersive ground anchor body 101: first tensile member
103: second tensile material 105: third tensile material

Claims (7)

A method of disposing a plurality of tensile members of a load-dispersed ground anchor body,
The thickness of the tensile material or the modulus of elasticity of the tensile material may be varied according to the length of each tensile material to correspond to the load rate caused by the difference in length of the plurality of tensile materials, The gap between the inner bottom bodies to which the tensile material is connected is corrected,
The interval (S) between the inner bottom bodies
S = (DELTA LN _{-N + 1} ) ELEA / P
_{(△ L N-N + 1} = △ L N - △ L N + 1, △ L N = PL N / EA N, △ L N + 1 = PL N + 1 / EA N + 1, △ L: increased volume N is the Nth tensile material, N + 1 is the Nth tensile material after the Nth tensile material, P is the load applied to the anchor head, L is the free length of the anchor, E is the tensile modulus of elasticity, Lt; RTI ID = 0.0 > tensile < / RTI &
A method of placing a tensile material considering the sound volume of a load - dispersed ground anchor body.
The method according to claim 1,
The tensile material
As the length of the tensile material increases, the unit area of the tensile material increases and as the length of the tensile material decreases, the unit area also decreases
A method of placing a tensile material considering the sound volume of a load - dispersed ground anchor body.
The method according to claim 1,
The tensile material
As the length of the tensile material increases, the elastic modulus also increases, and when the length of the tensile material decreases, the elastic modulus also decreases
A method of placing a tensile material considering the sound volume of a load - dispersed ground anchor body.
The method according to claim 1,
The tensile material
The total area of the tensile material or the modulus of elasticity of the tensile material is increased, and when the length of the tensile material is decreased, the unit area or the modulus of elasticity is decreased
A method of placing a tensile material considering the sound volume of a load - dispersed ground anchor body.
The method according to claim 1,
The larger the difference in thickness between the plurality of tensile materials is, the longer the interval between the inner bottom bodies is
A method of placing a tensile material considering the sound volume of a load - dispersed ground anchor body.
delete A method of arranging a tensile material by the method of arranging the tensile material according to any one of claims 1 to 5
Load distribution type ground anchor body.

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