KR20120005184A - Expansion anchor body structure and execution a method - Google Patents

Abstract

PURPOSE: A load-bearing structure of an expansion anchor and an installation method thereof are provided to secure a stable tensile force even in soft ground. CONSTITUTION: A load-bearing structure of an expansion anchor comprises a multi-expansion rod, top and bottom couplers(40,50), and a nozzle(60). The multi-expansion rod comprises outer and inner expansion rods(10,20) having a plurality of expansion wings(12). The top and bottom couplers are installed on the top and bottom of the multi-expansion rod. The nozzle, having a plurality of discharge holes(61), is installed on the leading end of a grout hose(70) inserted into the top coupler so that the leading end is reached to the bottom coupler.

Description

Expansion anchor body structure and execution a method}

The present invention relates to the lower body structure and construction method of the expandable anchor in more detail, while securing the space in the form of tightly sandwiched in the ground in a solid ground as a plurality of expansion wings of the multiple expansion rods in the ground to the outside. In the ground, the ground is pushed out to secure the space, and at the same time, the grout is injected into the secured space to improve the quality of the grout.In particular, in the undercarriage structure and construction method of the expandable anchor, which can secure the tensile strength stably even in the soft ground. It is about.

In general, the ground anchors are excavation works for underground structures to build or build construction and civil structures, and to prevent loss of soil by suppressing the slopes of the earth and construction work to prevent the ground from collapsing in response to soil pressure. It is widely used as a means for preventing or responding to buoyancy for preventing building injury.

These ground anchors are classified according to the load transfer method to the grout of the tension member. Unlike the tension anchors, which are susceptible to the progressive failure of the grout, the ground anchors are disposed at the rear of the anchorage where the tension member is fixed to efficiently disperse the anchoring load or to secure a high load. There is a trend to develop and use a compression type anchor using a combination of inner body.

There are two types of temporary anchors: a buried type for leaving the tension member after construction of the underground structure and a removal type for recovering the tension member.

Among the temporary anchors, buried anchors are widely used in wide area soils that do not interfere with the construction of other underground structures, even if they leave the tension material in the ground. Removable anchors are used for this.

Permanent anchors are used to reinforce permanent structures, such as to prevent injuries of buildings caused by groundwater levels, to stabilize cut slopes, and to prevent fall of retaining walls.

Compression-type anchors among the ground anchors as described above, by inserting at least one strand of the tension member to the anchorage of the tip portion to stabilize the temporary wall or permanent structure, and inserting the anchorage with the inner body coupled to the rear end into the drilled anchor hole. After arranging to maintain the spacing to cure the grout by injecting the anchor hole, the external anchorage is fastened to the tension member and given a tensile load is used in the case of fixing with a temporary wall or permanent structure.

The anchorage fixing the tension member is composed of a method of engaging the radially equally distributed tension member guides and simultaneously engaging the front end, the rear end or the rear end of the load bearing body.

As described above, the load-bearing body used in the conventional compression type anchor has a problem in that it does not play a separate role in the soft ground, but merely plays a role of merely fixing the tension member and having only grout and adhesive strength irrelevant to the quality of the grout. .

Since such anchor bodies must withstand the tensile force only by the friction of the main surface between the grout and the surrounding ground, the soft ground has a disadvantage that it cannot be designed with the load of the anchor body.

Therefore, it is difficult to secure the tensile force in the soft ground, so the length of the anchor is increased from the design stage, and the anchoring interval is narrowed, so the number of anchors is increased, and the anchor hole diameter is increased to secure safety. There was a problem such as an increase in construction costs.

The present invention has been made to solve various problems as described above, the object of which is to secure a space in the form of tightly sandwiched in the ground in a solid ground as a plurality of expansion wings of the multiple expansion rods in the ground to the outside. In order to improve the quality of the grout by injecting grout into the space secured by pushing out the ground and securing the space at the same time, it provides the inner body structure and construction method of the expandable anchor which can secure the tensile strength stably even in the soft ground. Is in.

The present invention forms a screw thread in the upper and lower inner surface of the circular pipe and cut the outer peripheral surface into a plurality of long and long in order to achieve the above object, to form an extended wing, on the upper, lower and middle parts of the outer peripheral surface of the extended blade An external extension rod formed through the hole, a multiple extension rod installed inside the external extension rod and having a plurality of internal extension rods having the same shape as the external extension rod, and fastened to the top and bottom of the multiple extension rod, An upper and lower coupler having through-holes and threaded protrusions formed on the inner and outer surfaces thereof, and a cylindrical nozzle having a plurality of discharge holes on the outer surface of the grout hose inserted into the upper coupler are provided. Characterized in that installed to reach the position of the lower coupler.

The present invention as described above has various effects as follows.

First, it is possible to secure the grout injection space widely because the extension wing is spread outward in the ground to maximize the space.

Second, there is an advantage that the grout quality and workability are good by spraying the grout while moving upwards in the same manner as the lower coupler, rather than the nozzle in which the grout is discharged.

Third, the flapping shape of the extension blades can be formed in a square and triangular shape, and the size of the flapping can be adjusted, so that it can be freely deformed to suit the working environment and ground conditions.

Fourth, there is an advantage to improve the grout quality by blocking the inflow of foreign matter into the grout by installing a packer into the outer and outer blades.

Fifth, because of the above-mentioned effect, in particular, even in soft ground, it is possible to secure the tensile force, so the length of the anchor can be shortened from the design stage, and the length of the anchor arrangement can be reduced, so that the number of anchors can be reduced, and the anchor boring diameter can be shortened. This also has the advantage of reducing construction costs.

1 is a perspective view showing the overall configuration of the present invention
Figure 2 is a front view showing the configuration of the present invention multiple extension rods
Figure 3 is a front view showing another configuration of the present inventors hole
4 is a perspective view showing another configuration of the present invention the extension blade
5 is a perspective view showing the configuration of the present coupler
6 to 7 is a perspective view showing the configuration of the nozzle of the present invention and the installation state diagram
8 is an installation state diagram of the present invention
9-10 is sectional drawing which shows the structure of the packer of this invention.
11 is a use state diagram of the present invention
12 to 13 is a flow chart showing the construction sequence of the present invention

Detailed description for carrying out the present invention as described above in detail by the accompanying drawings as follows.

1 is a perspective view showing the overall configuration of the present invention, Figures 2 to 7 are views showing the components of the present invention, Figures 8 and 11 are views showing the installation and use of the present invention, Figures 12 and 13 Is a flowchart showing the construction procedure of the present invention. In the figure, reference numeral 100 denotes the inner body of the extended anchor.

The main body 100 has a plurality of extension wings (12, 23), the external expansion rods (10, 20) consisting of multiple extension rods (30), and the upper and lower ends of the multiple extension rods (30) The nozzle 60 having a plurality of discharge holes 61 on the outer surface of the upper and lower couplers 40 and 50 and the grout hose 70 inserted into the upper coupler 40 are installed. Then, the tip of the nozzle 60 is configured to reach the position of the lower coupler 50.

The multiple extension rods 30 is composed of a plurality of internal extension rods 10 inserted into the external extension rods 20 and the external extension rods 20 as shown in the accompanying drawings.

The internal extension rods 10 are formed with threads 12 and 13 formed on the upper and lower outer surfaces of the circular pipe 11, and the cutout is divided into a plurality of pieces so as to have a predetermined width while the outer circumferential surface thereof is formed long and vertically. (14) is formed.

The extension blades 14 are usually formed on the circumference of six to use, but can be used to form six or more according to the user's convenience.

Semi-circular holes 15 are formed on the upper and lower sides of the extension blades 14, and semi-circular holes 15a are formed in the middle portion, so that the extension blades 14 are opened to the outside centering on the intermediate hole 15a. .

The external extension rods 20 are formed with threads 22 and 23 formed on the upper and lower inner surfaces of the circular pipe 21, and the outer circumferential surface is formed long and vertically in the upper and lower portions thereof, and is divided into a plurality of cuts so as to have a predetermined width. To form (24).

Semi-circular holes 25 are formed on the upper and lower sides of the extension blade 24, and semi-circular holes 25a are also formed in the middle portion so that the extension blades 24 are opened to the outside centering on the intermediate hole 15a. .

The intermediate holes 15a and 25a formed in the inner extension rods 10 and the outer extension rods 20 are formed at the center points of the extension blades 14 and 24 so that the extension blades 14 and 24 move outward. When it opens, the shape of the opening becomes square.

In addition, as shown in FIG. 3, the intermediate holes 15a and 25a formed in the inner extension rods 10 and the outer extension rods 20 are formed on the upper portions of the extension blades 14 and 24 to expand. When the wings 14 and 24 unfold outwards, the shape of the flare becomes triangular.

The reason for using the extension rods as a multiplicity as described above is that when the extension wings 14 and 15 are opened to the outside in the drill hole, the grout is stably injected to widen the grout area as much as possible.

The extension blades 14 and 15 formed on the inner and outer extension rods 10 and 20 are formed by cutting a cylindrical pipe as shown in FIG. 4, or are made of a separate metal and a nonferrous metal or fiberglass material. A plurality of circular rods 80 are installed on the circumference and used.

As such, the inner extension rod 10 of the inner and outer extension rods 10 and 20 having the same shape is inserted into and installed inside the outer extension rod 20 and then fixed using a coupler.

At this time, it is basic to insert one inner extension rod 10 into the outer extension rod 20, but a plurality of inserts can be inserted and used as necessary.

The coupler is composed of an upper coupler 40 and a lower coupler 50 fastened to the lower end of the multiple extension rods 30, and they are formed in the same form.

As shown in FIG. 5, the upper coupler 40 has a circular through hole 41 formed at a center thereof, and a coupling protrusion 44 having threads 42 and 43 formed at an inner surface and an outer surface thereof at a lower side thereof. It protrudes downward.

The lower coupler 50 has a circular through hole 51 formed in the center thereof, and a coupling protrusion 54 having threads 52 and 53 formed on the inner and outer surfaces thereof protrudes upward.

The nozzle 60 has a plurality of discharge holes 61 formed on the outer surface of the cylindrical shape of the lower end is sealed in a metal material as shown in the accompanying drawings and is inserted into the front end of the grout hose 70.

The grout hose 70 to which the nozzle 60 is fastened is inserted into the upper coupler 40 as shown in FIG. 7 and the position of the lower coupler 50 installed at the bottom of the multiple extension rod 30. To reach.

In addition, as shown in Figure 8 attached to the lower end of the coupler 50, the anchoring head 56 is fixed to install the fixing head 56 is a plurality of fasteners 55 is attached to the strand is mounted to form an anchor.

And the rear surface of the upper coupler 40 is fastened by fixing the casing. At this time, to facilitate the fastening of the casing is connected to the outer circumferential surface of the upper coupler 40 is formed with a plurality of engaging pins to operate up and down by the hinge shaft.

When the engaging pin is folded downward and the upper coupler 40 is inserted into the casing, the engaging pin is in close contact with the inner surface of the casing by the elasticity of the spring to block the discharge to the outside.

The inner and outer extension rods 10, 20 of the extension blades 14, 24 attached to the inside of the drawing as shown in Figure 9, the packer 90 is formed by double stitching the two circular fabrics.

This allows the grout to be stably injected while the packer 90 is also opened at the same time when the extension wings 14 and 24 of the inner and outer extension rods 10 and 20 are opened to the outside.

The packer 90 is formed to have a rectangular shape in which two triangles are symmetrically formed. This is the same shape as the expansion wings (14, 24) open to the outside.

In addition, the packer 90 may be installed and used outside the extension blades 14 and 24 of the inner and outer extension rods 10 and 20 as shown in FIG. 10.

The packer 90 configured as described above serves to block the grout from mixing with moisture or foreign matter in the drilling hole.

As described above, the present invention as shown in Figure 8 and 11, first, fastening the fixing head 56 to the tip of the lower coupler 50 of the multiple extension rods 30, and the stranded wire to the fixing head 56 A plurality of fasteners 55 to which 57 are fastened are installed.

At this time, the strand 57 passes through the interior of the multiple extension rods 30 to pass through the upper coupler 40 to be discharged out of the hole.

In addition, after inserting the nozzle 60 for injecting grout into the central portion of the plurality of strands 57 connected to the fixing unit 55, the tip of the nozzle 60 is inserted to the position of the lower coupler 50.

Then, after the casing 95 is fastened to the upper coupler 40 of the multiple extension rods 30, the main body 100 is inserted into the drilling hole formed in the ground.

In such a state, when the strand 57 is tensioned while the casing is fixed at the head of the drilling hole, the fixing unit 55 installed at the tip of the lower coupler 50 rises upwards and at the same time, the inner and outer extension bars 10. Growing through the discharge hole 61 of the nozzle 60 inserted into the multiple extension rods 30 while pushing out the soft ground to the outside while the extension blades 14 and 15 of the 20 are also opened to the outside. Filling the grout into the space opened by spraying.

At this time, the strand 57 is inserted into the coating tube 58 so that no grout is inserted.

Then, when the tension line 57 is tensioned again, the lower coupler 50 to which the anchorage 55 is fastened is lifted upward and further extends the extension blades 14 and 24 of the inner and outer extension rods 10 and 20. It is wide open, and the nozzle 60 installed inside the lower coupler 50 is also raised upwards and at the same time by spraying the grout to fill the grout into a more open space.

If the operation is carried out continuously and repeatedly, the grout is sequentially injected as much as the width of the extension blades 14 and 24 in the ground, so that the quality of the grout is excellent and the application area of the grout can be widened.

As described above, the present invention is based on the use of the inner and outer extension rods 10 and 20 without the use of inserting a separate packer into the extension wings 14 and 24, but if necessary, the extension wings 14 Packer 90 is installed and used inside and outside of 24.

Since the packer 90 has a rectangular shape and opens in the same direction as the expansion wings 14 and 24 are opened, the packer 90 serves to block foreign matter from entering the grout during grout injection.

The construction method for constructing the inner body of the expanded anchor as described above will be described with reference to FIGS. 12 and 13 as follows.

First, a punch hole is formed by drilling into a casing using a punch mill in the ground.

And the inner body body 100 of the expandable anchor is inserted and installed as shown in Figure 8 attached to the inside of the drilling hole.

At this time, the fixing head 56 installed in the lower coupler 50 is inserted in a state in which a plurality of fasteners 55 fastened to the strand 57 are fastened.

In this state, the casing is drawn out by the length of the lower body 100, and then the upper coupler 40 of the lower body 100 is fixed to the lower part of the casing so that the casing supports the lower body 100. .

In the state in which the casing supports the lower body 100, the strand 57 is connected to the drill equipment from the outside of the drilling hole and drawn at a low speed.

At this time, the fixing unit 55 installed in the lower coupler 50 is raised to the upper side by the pulling force and at the same time, the extension blades 14 and 24 of the multiple extension rods 30 are opened to the outside.

At this time, the slime inside the drilling hole is stacked below the drilling hole.

And as the expansion blades (14, 24) is expanded at the same time as shown in Figure 7 attached to the grout to the expanded space through the discharge hole 61 of the nozzle (60) installed inside the multiple expansion rod (30) Will be injected.

At this time, in the process of expanding the expansion blades (14, 24) of the multiple extension rods 30, before grout injection, the grout injection is carried out after the slime is discharged to the outside and the inside of the drilling hole is cleaned. It includes.

In addition, when the fixing unit 55 is drawn at a low speed, water is injected into the drilling hole to discharge the slime to the outside, and at the same time, the expansion blades 14 and 24 of the multiple extension rods 30 are cleaned. Expanding.

As described above, as the plurality of extension blades 14 and 24 are expanded, grout is injected to make the grout stable.

This process was repeated continuously to expand the extension blades 14 and 24 of the multiple extension rods 30 to the maximum width and after the grout injection was completed, the upper coupler 40 of the lower body 100 was fixedly supported. Pull the casing out of the hole.

At this time, the step of performing a casing pressure injection after installing a pressure stopper for sealing the casing located outside the drilling hole before the casing is drawn out to the outside of the drilling hole.

Then, install a temporary or permanent structure outside the drilling hole, and finishes the head by fixing the strand 57 to the tension.

And after the dismantling of the temporary installation in accordance with the intended use will be finished by removing the strand 57 in the anchorage (55).

In addition, before inserting the lower body 100 of the expandable anchor into the drilling hole, as shown in the accompanying drawings, Figures 9 and 10 formed by double stitching two circular fabrics into or out of the multiple extension rods 30 And inserting after the sex packer 90.

The packer 90 has the same width as the extension width of the extension blades 14 and 24 of the multiple extension rods 30, and has a rectangular shape in which the two triangles are symmetrically formed and grouted into the expanded space. By injecting the foreign matter to the grout to block the attachment to improve the quality of the grout.

100: body 10: internal expansion rod
11, 21: round pipe 12, 13: screw thread
14, 24: Extension wings 15, 25: Upper and lower holes
15a, 25a: Middle hole 20: External extension rod
30: multiple extension rods 40: top coupler
41, 51: Through hole 52, 53: Screw
44,54: Engagement protrusion 50: Lower coupler
60: nozzle 61: discharge ball
70: grout hose 80: round rod
90: Packer

Claims (10)

External extension rods formed with threads on the upper and lower inner surfaces of the circular pipe and cut out the outer circumferential surface in a plurality of long and up and down to form an extension wing, and an outer extension rod through which holes penetrate the upper, lower, and middle portions of the outer circumferential surface of the expansion blade, and external expansion. A multi-extension rod installed in the rod and having the same shape as the outer extension rod and composed of a plurality of inner extension rods having a small diameter;
Upper and lower couplers fastened to the upper and lower ends of the multiple extension rods, and having a through hole formed at a center thereof and a threaded protrusion formed at inner and outer surfaces thereof;
And a cylindrical nozzle having a plurality of discharge holes on the outer surface of the grout hose inserted into the upper coupler, and installed so that the tip of the nozzle reaches the position of the lower coupler. The method of claim 1,
The extension blades of the inner and outer extension rods are formed by cutting a cylindrical pipe, or the inner body structure of the expandable anchor, characterized in that formed by a circular rod made of a separate metal and non-ferrous metal or fiber glass. The method of claim 1,
Undercarriage structure of the expandable anchor, characterized in that the center hole is formed so as to be located in the center of the extension blade. The method of claim 1
Undercarriage structure of the expandable anchor, characterized in that the center hole is formed so as to be located at the upper point of the expansion blade. The method of claim 1,
Underload structure of the expandable anchor, characterized in that to install a packer formed by double-stitching two circular fabrics into the inner side of the extension blade of the inner, outer expansion rod. The method according to claim 5,
Undercarriage structure of the expandable anchor, characterized in that the packer is installed on the outside of the expansion blade. The method of claim 1,
The lower body structure of the expandable anchor, characterized in that the front end of the coupler is coupled to the fixing head is fastened to a plurality of anchorage is mounted fasteners. An expansion anchor insertion step of forming a drilling hole through the casing drilling and inserting an inner body having multiple extension rods having a fixing unit mounted on a lower coupler into the drilling hole;
A step of fixing the casing and the lower body to draw the casing outside the length of the lower body and to fix the upper coupler of the lower body to the lower portion of the casing to support the lower body;
A lower body extension and injection step of connecting the strand of the anchorage to the drill equipment outside the drilling hole to draw at a low speed to inflate the expansion wings of the multiple extension rods while spreading them to the outside and injecting grout into the expanded space;
Repeating the expansion and injection steps to expand the extension blades of the multiple extension rods to the maximum width and injecting grout and separating the casing and inner body separation step;
After drawing the separated casing to the outside of the drilling hole interior construction method of the extended anchor, characterized in that the head finishing step of finishing the head. The method of claim 8,
The inner body expansion and injection step,
In the process of connecting the stranded wire to the drill equipment outside the drilling hole and drawing it at low speed to expand the extension wings of the multiple extension rods, before the grout injection, the water is ejected by releasing the slime and the grout after cleaning the inside of the drilling hole. Underload construction method of the extended anchor, characterized in that it comprises the injection. The method of claim 8,
And a packer installation step of installing a packer formed by double stitching two circular fabrics inside or outside the multiple extension rods before the expansion anchor insertion step.

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