KR101107752B1 - Torque control type ground reinforcing device and using method thereof - Google Patents

Abstract

The present invention relates to a torque control type ground reinforcement configured to induce breakage by a torque load, and a preferred method of using the ground reinforcement.

Torque-controlled ground reinforcement according to the present invention is a rigid ground reinforcement, such as steel pipe pile, concrete pile, nail, screw pile, the brake neck is formed by the fracture groove at one or both ends, so that the rigid ground reinforcement of the rigid body type It is characterized by being divided into a main body and a pintail based on the neck.

Another torque control type ground reinforcing material according to the present invention is a removable anchor type ground reinforcing material in which a PC steel wire tip is fixed inside the fixing body, wherein the fixing body includes an outer sleeve; Tip cap; Internal sleeve; It is configured to include an inner wedge; characterized in that the brake neck is formed by the break groove in the inner sleeve of the fixture.

Ground reinforcement, torque, break, brake neck, recovery

Description

Torque control type ground reinforcing device and using method

The present invention relates to a torque control type ground reinforcement configured to induce breakage by a torque load, and a preferred method of using the ground reinforcement.

In the construction of buildings and road structures such as ground reinforcement behind the retaining wall, ground reinforcement under the foundation of foundation, slope reinforcement, ground reinforcement works are temporarily or permanently performed to prevent ground collapse. The most common ground reinforcement methods include pile method, soil nailing method, and earth anchor method, and piles, nails, steel wires, etc. used in these methods become ground reinforcement materials. These ground reinforcement materials have a ground reinforcing effect as they are settled on the ground and improve the bearing capacity (friction resistance).

In the ground reinforcement work, the bearing capacity (friction resistance) of the ground reinforcement is usually evaluated through load test results and structural calculation results. However, it is generally difficult to carry out the load test on the total transfer of the ground reinforcement materials. It is common to estimate the bearing capacity (friction resistance) of all ground reinforcement through However, the value estimated through sampling evaluation is inevitably inaccurate.

On the other hand, when the role of the ground reinforcement is no longer needed, it is necessary to remove the ground reinforcement. For example, the ground reinforcement is installed as a retaining support during the underground construction of a building. However, because the ground reinforcement is settled on the ground, it is quite difficult to force the ground reinforcement withdrawal and removal, which is generally not left without it. However, neglected ground reinforcement causes landowner disputes and groundwater contamination. In addition, despite the fact that it can be recycled, leaving it alone leads to waste of resources.

The present invention was developed in order to improve the bearing (friction resistance) evaluation problem and recovery problem of the conventional ground reinforcement, to provide a torque control type ground reinforcement having a brake neck formed by a break groove at one end, and provides a preferred method of using the ground reinforcement There is a technical problem.

In order to solve the above technical problem, the present invention is a rigid body reinforcing material, such as steel pipe pile, concrete pile, nail, screw pile, the brake neck is formed by the fracture groove at one or both ends of the rigid body ground reinforcement Provides a rigid body torque-controlled ground reinforcement, characterized in that divided into the main body and the pin tail based on the brake neck.

Furthermore, in the present invention, in using the above-mentioned rigid torque control type ground reinforcing material, the ground reinforcement is inserted into the ground so that the pin tail protrudes out of the ground while the pin tail is rear end, and the main body of the ground reinforcing material is fixed to the ground. step; Applying a predetermined torque load while holding the pintail of the ground reinforcement with a fastening mechanism; And evaluating the bearing capacity of the ground reinforcing material; or installing the ground reinforcing material by injecting the ground reinforcing material into the ground with the pintail as the tip and fixing the pintail of the ground reinforcing material in the ground; Inducing break of the brake neck while applying a predetermined torque load while holding the main body of the ground reinforcement with a fastening mechanism; And, withdrawing the main body of the ground reinforcing material; provides a method of using a torque-controlled ground reinforcing material comprising a.

In addition, the present invention is a removable anchor type ground reinforcing material is fixed to the inner end of the PC steel wire, the fixture is an outer sleeve; Tip cap; Internal sleeve; It is configured to include; the inner wedge is provided with a torque control type ground reinforcement of the removable anchor type, characterized in that the brake neck is formed by the breaking groove in the inner sleeve of the fixture.

Furthermore, the present invention uses the above-mentioned removable anchor type torque control type ground reinforcement, (a) preparing the ground reinforcement with the PC steel wire tip fixed inside the fixing body, Intruding ground reinforcement into the ground and fixing the outer sleeve and the end cap of the fixing body to the ground; (b) inducing breakage of the breakneck of the inner sleeve of the fixture while applying a predetermined torque load in a state where the tension of the PC steel wire is released and the PC steel wire is held by the clamping mechanism after a period of time after the tensioning of the PC steel wire; And, (c) inducing the removal of the inner wedge of the fixture by introducing the PC steel wire, and withdrawing and removing the PC steel wire provides a method of using a torque-controlled ground reinforcement comprising a.

According to the present invention, the following effects can be expected.

First, it is possible to evaluate the bearing capacity (friction resistance) of the ground reinforcement simply and easily by simply applying a predetermined torque load to the ground reinforcement installed in the ground. In this way, the ground reinforcement work can be performed based on the result of accurate bearing (friction resistance) evaluation.

Second, when the ground reinforcement is removed, it can be easily removed while minimizing damage to the ground reinforcement, which can increase the recovery rate of economically recyclable ground reinforcement, and thus resource saving effect can be expected.

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

1 shows various embodiments of a rigid body as an example of a torque controlled ground stiffener according to the present invention.

The rigid torque control type ground reinforcement 100 is a rigid ground type reinforcing material such as steel pipe pile, concrete pile, nail, screw pile, and the brake neck 110 is formed at one or both ends by a break groove. There is a technical feature that is divided into the main body 120 and the pintail 130 based on (110).

The brake neck 110 is formed as a groove having a shape penetrated from the outer circumferential surface of the rigid ground reinforcement 100, it is designed to break at a predetermined torque load. However, if the rigid ground reinforcement (100) is to be penetrated into the ground by a rotary press-type like a screw pile, the brake neck 110 is a torque load greater than the torque load required for the penetration installation of the rigid ground reinforcement (100) It should be designed to break at. Thus, when the pin torque 130 of the rigid body ground reinforcement is fixed and fixed, and a predetermined torque load is applied to the main body 120 of the rigid body ground reinforcement, breakage proceeds at the brake neck 110, and the rigid ground body reinforcement 100 is applied. Is separated into the main body 120 and the pin tail 130. However, since the break in the brake neck 110 is induced stably only when the pin tail 130 can be separated and fixed, in the present invention, the stopper 131 outside the pin tail 130 at the front of the brake neck 110. ) Is proposed to protrude. In other words, the rigid-type torque-controlled ground reinforcement of the present invention is grouted and installed in the ground, wherein the grouting section is only around the pin tail 130 above the brake neck 110 through the stopper 131. It was to limit.

The protective ring 140 may be fitted to the brake neck 110, and the protective ring 140 may be used to block an impact applied to the brake neck 110 during the penetration installation process of the rigid ground reinforcement 100. . Even if the protection ring 140 is mounted, breaking of the brake neck 110 proceeds when a torque load is applied. The protection ring 140 may be provided in the form of a snap ring to be mounted on the rigid ground reinforcement material 100.

Figure 1 shows various embodiments that are distinguished by the shape of the rigid ground reinforcement and the number of formation of the brake neck (110). Figure 1 (a) is an example in which the steel pipe pile is completed with a torque control type ground reinforcement with a protective ring 140, Figure 1 (b) is an example in which a screw pile is completed with a torque control type ground reinforcement, Figure 1 (c) ) Is an example of completing a nail with a torque control type ground reinforcement, Figure 1 (d) is an example of forming a brake neck 110 on both ends of the steel pipe pile to complete a rigid torque control type ground reinforcement. In addition, Figure 1 (a) (b) (c) is shown a configuration in which the configuration serving as the stopper 131 is formed, in particular, in Figure 1 (b) to extend the width in the middle of the screw blade stopper 131 ). Although not shown, the screw pile may be provided with a stopper in other ways such as to form the screw blades intermittently or in the reverse direction.

Figure 2 shows another example of a rigid torque control type ground reinforcement according to the present invention further includes an anchor, a form proposed to reinforce the bearing capacity of the ground reinforcement through the anchorage of the anchor.

The rigid torque-controlled ground reinforcement according to FIG. 2 is a hollow rigid ground reinforcement provided with a locking step 121 formed inside the main body 120 behind the pintail 130. An elastic wedge-type anchor 150 having an elastic wedge 151 mounted at the tip of the PC steel wire 152 is inserted into the hollow of the hollow body-based ground reinforcing material so that the elastic wedge 151 of the elastic wedge-type anchor is hollow steel. The locking jaw 121 of the body-based ground reinforcement is caught. Here, the elastic wedge-shaped anchor 150 is a configuration corresponding to the anchor that is usually used in the earth anchor method.

On the other hand, the rigid body of the torque control type ground reinforcement according to Figure 2, although not shown in detail, it is natural that the hollow ground reinforcement can be adopted in addition to the screw pile form as well as the general steel pipe form, further through the hollow ground The injection hole may be appropriately formed so as to grout to the outer surface of the reinforcement or to inject air or water pressure.

3 shows a method of evaluating the bearing force (friction resistance) by the ground reinforcement 100 as an example of the method of using a rigid torque control type ground reinforcement 100, by referring to the ground reinforcement 100 Step by step method of evaluating bearing capacity (friction resistance).

First, while the pintail 130 is the rear end, the rigid body reinforcement 100 is inserted into the ground so that the pin tail 130 protrudes out of the ground, and the body 120 of the rigid body reinforcement is fixed to the ground ( 3 (a)). Penetration installation and fixing of the rigid body ground reinforcement 100 is applied according to the conventional method according to the type of the rigid body ground reinforcement (100). If the steel pipe pile, concrete pile, nail-shaped torque control type ground reinforcement (100), after drilling the ground and then install the ground reinforcement (100) and then grouting to settle on the ground, but in this case In order to increase the fixation effect of the grout, a low water cement ratio and high strength grouting may be injected, while the other sections may be treated with a relatively thin grouting to fill the voids. If the screw-controlled torque control type ground reinforcement (100), the ground reinforcement (100) can be installed by the self-punching rotational penetration and then grouting to settle in the ground, and at this time the torque to prevent breakage in the brake neck (110) To adjust the load to perform a rotation intrusion process, while the screw pile is preferably adopted that the screw blade is configured to properly serve as the stopper 131. However, if the screw pile is a hollow screw pile having an injection hole, the rotational penetration process of the screw pile can be carried out by applying air pressure or water pressure through the hollow, and the screw pile is rotated during the grouting fixing process of the screw pile. It can be carried out in a manner of grouting while being hollowed out (the grouting is fixed as it is ejected through the injection hole).

Subsequently, a predetermined torque load is applied while the pin tail 130 of the rigid body ground reinforcement is held by the fastening mechanism (FIG. 3 (b)), and finally, the bearing force (friction resistance) of the rigid body ground reinforcement 100 is evaluated. (FIG. 3 (c)). In this case, the predetermined torque load is a value calculated in advance in consideration of the strength of the rigid body reinforcement. If the rigid ground reinforcement 100 is broken after applying the predetermined torque load, the bearing capacity (friction resistance) of the rigid ground reinforcement will be more than the torque load, and if the rigid ground reinforcement 100 is not broken, the rigid ground is not broken. Since the bearing force (friction resistance) of the reinforcing material will not reach its torque load, the bearing force (friction resistance) of the rigid body ground reinforcement 100 can be evaluated based on this.

4 and 5 illustrate a method of recovering the ground reinforcement 100 as an example of a method of using the rigid-type torque control type ground reinforcement 100 according to the present invention, with reference to this recovery of the ground reinforcement 100 We will walk you through the steps.

First, the pin tail 130 is set as a tip, and the rigid ground reinforcement 100 is inserted into the ground and the pin tail 130 of the rigid ground reinforcement is fixed to the ground (FIGS. 4A and 5A). ). The ground settlement process is the same as discussed above. However, in the method of recovering the ground reinforcement, the ground reinforcement of the rigid body type as shown in FIG. 2 may be adopted. In this case, the elastic wedge 151 of the anchor is inserted into the locking jaw 121 by inserting the elastic wedge anchor 150. In one state to proceed the process of tension fixing the elastic wedge-shaped anchor 150 (Fig. 5 (b)). The tension fixing process of the elastic wedge-shaped anchor 150 is the same as in the conventional ground anchor method.

After the rigid ground reinforcement is finished, the breakneck of the brake neck 110 is induced while applying a predetermined torque load while holding the main body 120 of the rigid ground reinforcement with the fastening mechanism (FIG. 4 (b) and 5 (c)). However, when the rigid body reinforcement of Figure 2 is adopted, the tension of the elastic wedge-shaped anchor 150 can be released before applying the torque load.

Finally, the main body 120 of the rigid body reinforcing material is taken out and removed (FIG. 4 (c) and FIG. 5 (d)). Of course, in the case of adopting the rigid body ground reinforcement of Figure 2 with the main body 120 of the rigid body ground reinforcement can be pulled out to remove the elastic wedge anchor 150, the removed rigid body ground reinforcement (100) Can be recovered and recycled again.

Figure 6 shows a removable anchor type as another example of the torque control type ground reinforcement according to the present invention.

Removable anchor type torque control type ground reinforcement 200 is a removable anchor type ground reinforcement (200), the tip of the PC steel wire 250 is fixed to the inside of the fixture, the fixture is an outer sleeve (210); Tip cap 220; Inner sleeve 230; The inner wedge 240 has a technical feature in that the brake neck 231 is formed by the break groove in the inner sleeve 230 of the fixing body.

The outer sleeve 210 in the fixture is a configuration in which a transmissive window 211 through which the PC steel wire 250 passes through the rear end face with a tubular member in which the front end face is opened and the rear end face is closed, and the tip end in the fixture Cap 220 is configured to close the front end surface of the outer sleeve by detachably coupled to the front end of the outer sleeve (210). In Figure 6 (a) it can be seen that the outer sleeve 210 and the front end cap 220 is detachably coupled in a screw fastening method.

In the fixing body, the inner sleeve 230 is completely inserted into the inner space by the outer sleeve 210 and the tip cap 220 so as not to be exposed to the outside, while the outer sleeve 210 becomes the free end while the front end becomes the fixed end. ) Or the tip cap 220 in combination with the configuration, the PC steel wire 250 is the tip is inserted therein. In FIG. 6 (a), an outer sleeve 210 having a longitudinal protrusion 212 formed only at the inner circumferential surface end and an inner sleeve 230 having a longitudinal groove 232 formed at the front and rear ends of the outer circumferential surface may be used. The front ends of the 210 and the inner sleeve 230 are splined to each other by longitudinal protrusions and grooves 212 and 232 to become fixed ends, while the rear ends of the outer sleeve 210 and the inner sleeve 230 are not coupled to each other. You can see the form of free ends. Since the longitudinal grooves 232 of the inner sleeve are formed throughout the front and rear ends of the outer circumferential surface of the inner sleeve, the inner sleeve may be naturally inserted into the outer sleeve through the front end of the outer sleeve, and thus may be coupled to the inside of the outer sleeve 210. The inserted inner sleeve 230 is blocked by the rear end surface of the outer sleeve 210 and fixed inside the outer sleeve 210. On the other hand, the inner sleeve 230 is formed on the rear end of the brake neck 231 by the breaking groove, thereby completing the torque control type ground reinforcement according to the present invention. In particular, in Figure 6 (a) is shown a state in which the brake neck 231 is formed on the side and the front surface at the rear end surface of the inner sleeve 230, the brake neck 231 is to be formed in only one of the side and the front surface. Can be.

In the fixing body, the inner wedge 240 is fitted to the rear end surface of the inner sleeve 230 to fix the PC steel wire 250 to the rear end surface of the inner sleeve 230, and the wedge that is usually used for the removable anchor body as it is. Applicable

Torque-controlled ground reinforcement type 200 of the removable anchor type as described above, after preparing the ground reinforcement 200 in a state where the tip of the PC steel wire 250 is fixed inside the fixture, the ground reinforcement ( 200) is inserted into the ground, and the outer sleeve 210 and the end cap 220 of the fixing body is fixed to the ground, and after a certain time has elapsed after tensioning the PC steel wire 250 (reinforcement by the ground reinforcement material) When no longer needed) As shown in Fig. 6 (b), the tension of the PC steel wire 250 is released and the brake neck of the inner sleeve of the fixing body is subjected to a predetermined torque load while the PC steel wire 250 is held by the fastening mechanism. Induce the break of 231, and then inject the PC steel wire 250 as shown in Figure 6 (c) (d) to induce the dropping of the inner wedge 240 of the fixture and then pull out the PC steel wire 250 It is used to remove. The ground settlement process of ground reinforcement is generally the same as the ground settlement process of the removable anchor body in the earth anchor method. Since the inner wedge 240 is loosened due to the breakage of the inner sleeve 230, when the PC steel wire 250 is introduced, the drop of the inner wedge 240 is induced, thereby allowing the removal of the PC steel wire 250. In particular, Figure 6 (c) shows a process that can remove the PC steel wire 250 as the inner sleeve 230 is broken through the brake neck 231 formed on the side of the rear end surface, Figure 6 (d) It shows a process that can be removed as the PC steel wire 250 is broken through the break neck 231 formed on the front end surface of the inner sleeve 230.

The present invention has been described in detail above with reference to specific embodiments, but the embodiments are only intended to illustrate the present invention, so that the embodiments substituted, added, and modified within the scope without departing from the spirit of the present invention are also described below. It will be said to belong to the protection scope of the present invention as defined by the claims appended hereto.

1 and 2 show a rigid body as an example of the torque control type ground reinforcement according to the present invention.

3 and 4 illustrate a method of using the torque control type ground reinforcement of FIG.

FIG. 5 illustrates a method of using the torque controlled ground reinforcement of FIG. 2.

Figure 6 shows a removable anchor type as another example of a torque controlled ground stiffener according to the present invention.

<Description of the symbols for the main parts of the drawings>

100: rigid torque control ground reinforcement

200: Torque-controlled ground reinforcement of removable anchor type

110, 231: breakneck

120: main body

130: pintail

140: protection ring

150: elastic wedge anchor

151: elastic wedge

152, 250: PC steel wire

210: outer sleeve

220: tip cap

230: inner sleeve

240: internal wedge

Claims (8)

As a hollow ground reinforcement of a rigid body such as steel pipe pile, hollow concrete pile, hollow nail, hollow screw pile, the brake neck 110 by the break groove is formed on the outer circumferential surface of one or both ends to form the brake neck 110 Rigid-type hollow ground reinforcement 100 is divided into the main body 120 and the pin tail 130, the locking jaw 121 is formed inside the main body 120 of the rear pin (130); An elastic wedge-type anchor with an elastic wedge 151 mounted at the tip of the PC steel wire 152, which is inserted into a hollow of the rigid hollow ground reinforcement and is elastically wedge-shaped so that the elastic wedge 151 is caught by the locking jaw 121. Anchor 150; Torque-controlled ground reinforcement, characterized in that configured to include. In claim 1, The rigid hollow ground reinforcement 100 is a torque control type ground reinforcement, characterized in that the stopper 131 protruding outside the pin tail 130 of the brake neck (110). The method of claim 1 or 2, The rigid hollow ground reinforcement 100 is a torque control type ground reinforcement, characterized in that the protective ring is mounted on the brake neck (110). PC steel wire 250 as a removable anchor type ground stiffener 200 is fixed to the inside of the fixture, The fixing unit, An outer sleeve 210 having a transmissive window 211 through which the PC steel wire 250 passes through the tubular member having the front end face open and the rear end face closed; A front end cap 220 which is detachably coupled to the front end of the outer sleeve 210 to close the front end surface of the outer sleeve; The outer sleeve 210 or the front end cap 220 is inserted into the inner space by the outer sleeve 210 and the front end cap 220 so as to be unexposed to the outside while the rear end becomes a free end while the front end becomes a fixed end. An inner sleeve 230 to be coupled, the front end of the PC steel wire 250 is inserted through the rear end surface; It is configured to include; the inner wedge 240 is fitted to the rear end surface of the inner sleeve 230 to fix the PC steel wire 250 to the rear end surface of the inner sleeve 230, Torque-controlled ground reinforcement, characterized in that the brake neck 231 by the break groove is formed on the rear end surface of the inner sleeve (230). As a ground reinforcement of rigid bodies such as steel pipe piles, concrete piles, nails, screw piles, a brake neck 110 is formed at one end or both ends by a fracture groove so that the rigid body ground reinforcement is based on the brake neck 110. In using the torque-controlled ground reinforcement (100), characterized in that divided into 120 and the pin tail 130, (a) the rear end of the pin reinforcement to the ground so that the pin tail 130 protrudes out of the ground while the rear end of the pin tail 130 and fixing the main body 120 of the ground reinforcement to the ground; (b) applying a predetermined torque load while holding the pin tail 130 of the ground reinforcement with a fastening mechanism; And, (c) evaluating the bearing capacity of the ground reinforcement (100); Method of using a torque control type ground reinforcement, characterized in that comprises a. delete In using the torque-controlled ground reinforcement according to claim 1 or 2, (a) a step of fixing the pintail 130 of the ground reinforcement to the ground by installing a rigid hollow ground reinforcement 100 into the ground with the pin tail 130 as a tip; (b) the anchor 150 having the elastic wedge 151 mounted at the distal end of the PC steel wire 152 is inserted into the hollow of the rigid hollow ground reinforcement so that the elastic wedge 151 of the anchor is caught by the locking jaw 121. Tension anchoring the anchor 150 in a state; (c) inducing breakage of the brake neck 110 while applying a predetermined torque load while holding the main body 120 of the rigid hollow ground reinforcement with a fastening mechanism; And, (d) extracting and removing the main body 120 and the anchor 150 of the rigid hollow ground reinforcement; Method of using a torque control type ground reinforcement, characterized in that comprises a. In using the torque-controlled ground reinforcement 200 according to claim 4, (a) The ground reinforcement 200 is prepared with the PC steel wire 250 tip fixed to the inside of the fixture, and the ground reinforcement 200 is inserted into the ground with the fixture as the tip, and the outer sleeve of the fixing body ( 210 and the tip cap 220 is fixed to the ground; (b) When the time has passed after the PC steel wire 250 is tensioned and fixed, the PC steel wire 250 is released and the PC steel wire 250 is held by the fastening mechanism while applying a predetermined torque load. Inducing break of the brake neck 231; And, (c) introducing the PC steel wire 250 to induce the dropping of the inner wedge 240 of the fixing body, and then removing the PC steel wire 250 by pulling it out; Method of using a torque control type ground reinforcement, characterized in that comprises a.

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