KR100862387B1 - Tensional kit for top-down constructing of acupressure lasting anchor and top-down constructing method of acupressure lasting anchor using this - Google Patents

Abstract

A tensional kit for top-down construction of a pressure type permanent anchor and a top-down construction method for a pressure permanent anchor using the same are provided to increase the degree of space efficiency in a limited space by forming an incline plane at a vertical angle or an angle near to a vertical angle. A tensional kit for top-down construction of a pressure type permanent anchor comprises a first pressure plate(11), a cylindrical casing(12) and a second pressure plate. The first pressure plate is supported by an incline plane formed by excavation. The casing is buried to the underground by passing through the first pressure plate. The second pressure plate is detachably coupled with an end of the casing to press the incline plane through the first pressure plate. A plurality of reinforcing ribs(15) are formed at the peripheral portion of the casing. A cylindrical fixing head(14) protrudes from the second pressure plate.

Description

Tensional kit for top-down constructing of acupressure lasting anchor and top-down constructing method of acupressure lasting anchor using this}

The present invention relates to an anchor construction method, and more particularly, it is possible to shorten the air by going through the excavation and anchor construction from the ground to the ground, and to form a normal surface at an angle close to the vertical or vertical space utilization in a limited space The present invention relates to a tension kit for top-down construction of acupressure-type permanent anchors that can increase the pressure, and a top-down construction method of acupressure-type permanent anchors using the same.

After excavation of slopes, various slope stabilization methods such as permanent anchors, soil nailing, stepped and leaning retaining walls, and slope greening are applied to slopes to prevent slope collapse and slope stability.

Anchors are used to prevent the collapse of incisions in incisions, to stabilize slopes, to prevent injuries caused by groundwater in large structures such as buildings or dams, and to prevent the collapse of excavated walls in underground construction of large buildings. It is installed to prevent the movement or distortion of the construction when constructing a large steel tower.

Conventional anchoring method drills an excavation hole using a perforator in the ground where there is a risk of collapse, and inserts a grout hose, a plurality of tension members and a load body into a single unit, and then inserts a grout hose into the hole. Injecting grout through the grout, and when the injected grout is cured together with the lower body, the fastener is fastened to the other end of the tension member and the tension member is tensioned using hydraulic equipment to stabilize the target structure.

However, according to the construction method of the anchor according to the prior art has the following problems.

As shown in Figure 1, starting the excavation from the ground to proceed to the ground or when expanding the existing road proceeds to the excavation while going up from the ground to the ground, and then the construction of the anchor (1) to the ground from the ground to the long There is a problem that it takes a long time to increase the cost and stabilize the surface (2), and the conventional anchor method has a problem that the air is long during the curing period because the minimum curing period is required after the grout placement.

In addition, in order to construct the anchor 1, the slope slopes are secured to secure the minimum slope safety factor, and then the anchor 1 is multistage in order from the bottom to the ground side. Install with). Therefore, the slope of the slope (2) due to cutting is inevitably increased in order to secure the slope safety rate, so the site for use is narrowed. Excessive excavation width causes excessive damage to the environment of the mountain region, and there is also a problem of increasing construction cost. .

The present invention is to solve the problems as described above, the tension kit for the top-down construction of the pressure-type permanent anchor that can shorten the air by proceeding excavation and anchor construction from the ground to the ground and acupressure-type permanent using the same Its purpose is to provide an anchor top-down construction method.

In addition, another object of the present invention is to ensure the maximum use site in a limited area by forming a legal surface at an angle close to the vertical or vertical to minimize dead space.

The tension kit for the top-down construction of acupressure permanent anchor according to the present invention for achieving the object as described above, is inserted into the inlet side of the anchor hole for stable mounting on the slope and the free length of the anchor passes through Casing, the first and second pressure plate, respectively coupled to the casing at a predetermined interval along the longitudinal direction, characterized in that it comprises a fixing head which is formed on the second pressure plate and the tensioner is supported.

In addition, the top-down construction method of acupressure-type permanent anchor using a tension kit for top-down construction of acupressure-type permanent anchor according to the present invention, excavation of a certain depth in the vertical direction from the ground-Foundation reinforcement wall formation-Kit And anchor construction-Anchor 1st tension process is carried out from the ground down, and when excavation is completed to the desired depth, a concrete retaining wall is installed in front of the foundation reinforcement wall, and then a second tension acupressure plate is installed on the concrete slope. It characterized in that the anchor is tensioned second.

According to the tension kit for the top-down construction of acupressure permanent anchor according to the present invention and the top-down construction method of acupressure permanent anchor using the same, the tensile force by the first tension on the ground by constructing the anchor while descending from the ground sequentially By applying, the safety factor of the excavation surface is secured, and the excavation of the lower side can be carried out during the construction of the anchor at the upper end, that is, some processes of the upper end and the lower end can be carried out simultaneously, so that the air can be shortened. As it can be prevented, excavation and anchor construction are performed together, which greatly reduces the air and ensures slope stability.

In addition, by forming the surface at an angle perpendicular to or near to the vertical, all areas can be used as much as possible, thereby increasing the space utilization, reducing the cost of purchasing the site, preventing large cut slopes, and reducing the environmental damage. Overuse can be prevented.

As shown in FIGS. 2 and 3, the tension kit 10 for top-down construction of acupressure-type permanent anchors according to the present invention includes a first acupressure plate 11 and an anchor hole supported on a surface 2 by excavation. Casing 12, tensioner (2a) is inserted into the inlet side of the (2a) to support the anchor hole (2a) and the free field (1a) (see Fig. 5) of the acupressure-type permanent anchor (1) therein. Reinforcing ribs for reinforcing the strength of the second pressure plate 13, the fixing head 14 for fixing the tensioner 100, the casing 12 for pressing the surface (2) by 100 (see FIG. 5) It consists of 15 pieces.

The first pressure plate 11 is a flat plate shape, for example, a quadrilateral plate shape, and is supported on the surface 2 (substantially shotcrete portion). The first pressure plate 11 may be supported by the casing 12 inside the legal surface 2 and may be fixed through a separate anchor (not shown).

The casing 12 has a cylindrical shape in which both sides penetrate therein, and the first pressure plate 11 is formed therethrough. That is, the first pressure plate 11 and the casing 12 are integrally formed, or the first pressure plate 11 (hole forming for joining the casing 12) and the casing 12 are manufactured, respectively, and then welded to each other. Can be combined.

The casing 12 protrudes to both sides of the first pressure plate 11 regardless of the manufacturing method. That is, the portion protruding toward the front of the first pressure plate 11 is the insertion portion 12a inserted into the anchor hole 2a.

The casing 12 has an insertion portion 12a inserted into an anchor hole 2a formed inside the law surface 2 and fixed to the law surface 2.

The second acupressure plate 13 is formed on the casing 12 from the first acupressure plate 11 by a predetermined distance (this distance is a casting section of concrete to be described later) and is supported by a concrete part to be described later, and the surface is tensioned by the tensioner 100. By acupressure (2), it is made of a plate-like, the acupressure portion 13a to which the fixing head 14 is coupled, it may be made of a coupling portion connected to the casing 12 through and coupled to the acupressure portion 13a. The second pressure plate 13 is spaced apart from the end of the casing 12 so that the pressure can be generated in a wider distribution than the first tension during the second tension.

The connection part may be composed of a first connection part 13b having the same diameter as that of the casing 12 and a second connection part 13c which is coupled to the inside of the first connection part 13b by welding or the like and which is internally coupled to the casing 12. .

Here, the separation of the second pressure plate 13 from the first pressure plate 11 so that the primary tension force is generated from the first pressure plate 11, the secondary tension force is less than the pressure pressure generated by the first pressure plate 11 This is to allow the earth pressure to be generated in a large area.

The second pressure plate 13 is separated from the concrete retaining wall during the secondary tension, and for this purpose, the release agent is applied so that a release film is formed on the outer circumferential surface to facilitate separation.

The fixing head 14 protrudes from the second pressure plate 13 and the tensioner 100 is supported.

The fixing head 14 has a cylindrical shape through which the free field 1a of the anchor 1 penetrates, and may be fixed to the second pressure plate 13 as a single piece. For example, by forming a mounting groove in the second pressure plate 13 so that the fixing head 14 is inserted, the binding force between the fixing head 14 and the second pressure plate 13 is increased and the separation of the fixing head 14 is prevented. In addition, it may be fixed with a bolt or the like.

That is, when only one of the casing 12 or the fixing head 14 is deformed or broken, the maintenance cost can be reduced since the casing 12 and the fixing head 14 can be separated and repaired by selecting only the parts requiring replacement. .

The reinforcing rib 15 is formed to prevent axial deformation of the casing 12 and to enhance casing rigidity. A plurality of reinforcing ribs 15 are radially formed at regular intervals along the circumferential direction at the circumference of the casing 12.

The reinforcing rib 15 may be provided with a reinforcing bar groove 15a to which the reinforcing bar 20 to be described later is supported.

Kit 10 according to the present invention is applicable to all anchors, nailing, and the like used in the past.

Referring to Figure 4 will be described the top-down construction method of acupressure-type permanent anchor using a tension kit for the top-down construction of the acupressure-type permanent anchor according to the present invention configured as described above.

(S10) excavation.

The construction method according to the present invention is to construct the anchor while descending from the ground in order, it is designed to a certain height to be constructed step by step in accordance with this design. For example, if the design consists of 3m installations, excavate 3m deep from the ground. At this time, the anchor surface is to be constructed is less problem than when the construction from the conventional construction from the lower side is almost no problem even if close to vertical. Therefore, excavation is performed so that the vertical law surface 2a is formed, and the work space of the flat surface is formed so that the construction of the lower end may be easy.

(S20) surface reinforcement.

Since the surface 2 is made of soil, soil loss due to stress release in the ground may occur, and a foundation reinforcement wall 3 is formed to reinforce it. The foundation reinforcement wall 3 may be formed by shotcrete casting and may have a thickness of 4 to 6 cm, and the shotcrete and the injector are commonly used products.

(S30) anchor hole perforation.

Anchor hole 2a is drilled in the ground behind the foundation reinforcement wall 3 by mounting a perforator on the excavated flat surface. Although only one anchor hole 2a is illustrated in the drawing, two or more anchor holes 2a are drilled at the same height in the width direction of the foundation reinforcing wall 3. Depending on the size of the anchor hole (2a) and the position of the fixing portion of the anchor hole (2a) will vary depending on the site conditions (ground condition), so it is not limited to specific values.

(S40) Kit and anchor installation.

The kit 10 according to the present invention described above is installed at the inlet side of the anchor hole 2a, and the anchor 1 is inserted into the anchor hole 2a through the kit 10. The anchor 1 consists of a fixing part 1b and a free field 1a, inserts the fixing part 1b to the inner bottom of the anchor hole 2a, and the free field 1a penetrates the fixing head 14. To draw it outward.

(S50) primary tension.

After the tensioner 100 is supported by the fixing head 14, the free field 1a is connected to the tensioner 100, and then the free field 1a is tensioned. When the free field 1a is tensioned, the fixing unit 1b is fixed in the ground, and the ground pressure is applied through the first pressure plate 11 to reinforce the ground. When the first tension of the anchor 1 is completed, the cement milk may be filled in the anchor hole 2a or the cement milk may be filled by sealing only the inlet side of the anchor hole 2a. The kit 10 of the present invention can be applied to all anchors currently used, that is, anchors (e.g., patent No. 746879 registered by the applicant) that anchor the anchoring hole when the tensioner is opened to secure the free field. Although not specifically described, it can be sufficiently carried out by those skilled in the art.

On the other hand, after the excavation of the foundation reinforcing wall (3) during the construction of the curing and anchoring may be excavated the lower side, it is possible to proceed with the succession of the upper and lower ends can be shortened air.

The construction of the first stage is completed through the above process, the construction of the desired height is completed by repeating this process toward the basement. In the case of explaining the third stage as an example, the first stage is constructed as described above, and the second stage is constructed by repeating the above-described process on the lower side of the first stage (S51), and the third stage is completed after the construction of the second stage is completed. Construct (S60). After one stage of shotcrete curing, two stages of excavation and the like can be carried out, and two stages of shotcrete can be carried out after three stages of excavation and the like, so that the air can be shortened.

The primary tension can be 70 to 80% (when the secondary tension is 100%, the primary tension is 70 to 80%), which means that the pressure area of the first pressure plate 11 is small and the strength of the shotcrete is Since it is weaker than the concrete retaining wall, it is to prevent infiltration of soil in the first acupressure plate 11 at the time of overtension. At such a first tension, as shown in FIG. 5, a compression distribution line F1 is formed starting from the first pressure plate 11.

(S70) Concrete retaining wall construction.

When the excavation of the desired height is completed as in step (S60), the formwork 4 is installed on the front surface of the foundation reinforcement wall 3. Formwork 4 will be installed according to the thickness of the concrete retaining wall (5), provided that the second pressure plate 13 of the kit 10 is exposed to the position. When installing the formwork (4) reinforce the reinforcing bar 20 (see Fig. 6) for the reinforcement around the kit 10 and easy reinforcement of the final retaining wall. Reinforcing bar 20 is a plurality of reinforcing bars are coupled in the longitudinal direction may be, for example in the form of a hexahedron and is installed to cover the periphery of the kit (10). In order to reinforce the strength of the concrete retaining wall 5, the reinforcing bar is arranged inside the formwork, which may be connected to the reinforcing bar 20 and reinforced.

When the installation of the formwork (4) is completed, the concrete is poured between the formwork (4) and the foundation reinforcement wall (3) to cure. When curing of the concrete retaining wall 5 is completed, the formwork 4 is demolded.

(S80) 2nd tension.

Using the tensioner 100, the free field 1b of the anchor 1 is tensioned to 100% of the design tension. As shown in FIG. 7, after removing the second pressure plate 13, a tensioner 100 (including a tensioner and a pressure plate may be used as it is) may be installed on the surface of the concrete retaining wall 5. 2nd tension. At this time, the pressure distribution line (F2) is formed from the tensioner 100 as a starting point is made of a larger distribution than the first tension.

For reference, slope safety activity is defined in slope design criteria during the construction period: Fs (Factor Safety) ≥ 1.0, dry season Fs ≥ 1.5, and rainy season (at ground level) Fs ≥ 1.2. Most slopes lack safety during the rainy season, resulting in the destruction of activities during heavy rains.

In the present invention, during the excavation work, the primary tension force is 70-80% of the final design tension force to secure the required safety factor during construction and dry season even during tension, and the secondary tension force to ensure safety factor during the rainy season after the concrete retaining wall is placed. It is to re-tension to 100% of design tension.

1 is an anchor construction state diagram according to the prior art.

Figure 2 is a perspective view of the tension kit for the top-down construction of acupressure permanent anchor according to the present invention.

Figure 3 is an enlarged view of the installation state of the tension kit for the top-down construction of acupressure permanent anchor according to the present invention.

Figure 4 is a process diagram of the top-down construction method of acupressure permanent anchor using a tension kit for the top-down construction of acupressure permanent anchor according to the present invention.

Figure 5 is a state diagram at the time of the first tension according to the present invention.

Figure 6 is an enlarged view showing the reinforcing bar applied to the top-down construction method of acupressure permanent anchor using a tension kit for the top-down construction of acupressure permanent anchor according to the present invention.

Figure 7 is a state diagram at the time of the secondary tension according to the present invention.

<Description of Signs for Main Parts of Drawings>

1: anchor, 2: face

3: foundation reinforcement wall, 5: concrete retaining wall

10: kit, 11,13: pressure plate

12: casing, 14: fixing head

20: rebar,

Claims (5)

delete A first acupressure plate 11 supported on the surface by excavation; A casing 12 having a cylindrical shape and penetrating the first pressure plate to be buried in the ground and protruding to the ground, and having a tension member of the acupressure permanent anchor therein; A second pressure plate (13) detachably coupled to be spaced apart from an end of the casing by a tensioner to pressurize the surface through the first pressure plate; A plurality of reinforcing ribs 15 formed along the circumferential direction of the circumference of the casing; And, A cylindrical fixing head 14 protruding from the second acupressure plate and supported by a tensioner on the second acupressure plate, The second acupressure plate is made in a plate shape for the top-down construction of the acupressure-type permanent anchor, characterized in that the acupressure part 13a to which the fixing head is coupled, the acupressure part is connected to the casing and connected to the casing. Tension kit. delete First digging a predetermined depth in the vertical direction from the ground; A second step of forming a foundation reinforcement wall (3) on the primary excavated method (2) formed by the first step; A third step of drilling an anchor hole (2a) for the construction of acupressure-type permanent anchor in the foundation reinforcement wall and the ground formed by the second step; At the inlet side of the anchor hole drilled in the third step, a tension kit for top-down construction of the acupressure permanent anchor according to claim 2 is installed, and the acupressure permanent anchor 1 is inserted into the anchor hole. Performing a fourth step; A fifth step of applying pressure by tensioning the tension member of the acupressure-type permanent anchor to a primary pressure in a state in which the tension device 100 is supported on the second pressure plate of the kit after the fourth step; After repeating the first to fifth steps toward the ground to form a normal surface of the desired height, the concrete retaining wall to a thickness that exposes the second pressure plate of the kit from the surface of the foundation reinforcement wall for the normal surface of all height ( A sixth step of constructing 5); And, After the sixth step is completed, after removing the second pressure plate of the tension kit for the top-down construction of the acupressure-type permanent anchor and install a tensioner on the surface of the concrete retaining wall secondary tension of the tension member of the anchor to pressure Top-down construction method of acupressure-type permanent anchor using a tension kit for the top-down construction of acupressure-type permanent anchor comprising a seven step. The method of claim 4, wherein in the fifth step, the tension of 70 ~ 80% of the final design tension, and in the seventh step for the top-down construction of the acupressure-type permanent anchor, characterized in that the tension to 100% of the final design tension Top-down construction method of acupressure permanent anchor using tension kit.

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