KR100869566B1 - Apparatus for reinforcing crack and reinforcing method using the same - Google Patents

Abstract

The present invention relates to a crack reinforcing device and a crack reinforcing method using the same, comprising: a pumping unit for pumping a reinforcing material which is a suspension; An oscillating unit in communication with the pumping unit to vibrate the reinforcing material such that the particle (s) included in the reinforcing material introduced into the inlet side by the pumping unit are in an excited state; And a tip dispensing unit communicating with the outlet side of the excitation unit to inject the excited reinforcement into the object to be reinforced, thereby effectively injecting a high concentration of high viscosity reinforcement into the minute cracks of the object to reinforce the object. It helps to maximize the effect.

Description

Crack reinforcement device and crack reinforcement method using the same {APPARATUS FOR REINFORCING CRACK AND REINFORCING METHOD USING THE SAME}

1 is a block diagram for explaining the outline of the crack reinforcing device according to an embodiment of the present invention,

FIG. 2 is a partial block diagram centering on the excitation unit and the adjustment unit of FIG. 1,

3 is a longitudinal sectional view of the vibration generator of FIGS. 1 and 2;

4 is a perspective view of an artificial test body for testing the injection performance of the reinforcing material for cracks,

5 is a graph showing the penetration rate when passing the artificial test specimen of FIG.

FIG. 6 is a graph showing the penetration rate when passing the artificial test body of FIG. 4 using the micro cement suspension as a reinforcing material. FIG.

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

100: pumping unit 120: pumping pipe

130: pump 200: having unit

201: vibration generator 210: first housing

220: second housing 230: vibrating rod

240: diaphragm 250: drive motor

300: tip end injection unit 400: adjustment unit

600: artificial test body

The present invention relates to crack reinforcement, and more particularly, to a crack reinforcement apparatus for reinforcing a crack generated in an object such as a rock or a structure, and a crack reinforcement method using the same.

Cracks occur in the structure and the ground (hereinafter referred to as the "object") due to the excavation process of a structure such as a building, a tunnel, an underground highway facility, or an internal or external factor after construction. The cracks facilitate the penetration of water into the object. As the crack is further advanced, structural safety of the object may be threatened.

In order to solve the risk due to such cracks, a reinforcing method of injecting a reinforcing material into the cracks is used. As the reinforcing material, a suspension type in which cement or the like is mixed with water, or a solution type such as a water glass chemical solution is used.

Portland cement suspension used in the suspension form is easy to express high strength to improve the strength and durability of the object and is cheap and economical, but fine cracks due to the viscosity of the suspension (gap 1/10 to 2/10 mm range) There is a problem that the permeability to the following cracks) is inferior. In other words, water and cement are separated for the microcracks, thereby reducing the amount of cement injected. This means that the reinforcement for the microcracks is insufficient.

In order to reinforce the microcracks, ultrafine cement cement having excellent permeability to the microcracks (average particle size of 10 µm, which is comparable to solution type and capable of high strength expression) is used as a suspension or a solution type reinforcement material. However, they are all expensive and uneconomical. Furthermore, the solution type reinforcing material has a problem of inferior reinforcing strength and durability for the object as compared with the cement suspension.

In order to solve the above problems, the present invention is to provide a crack reinforcement device and a crack reinforcement method using the same, which can effectively inject a high viscosity high concentration reinforcement material that can be expressed more economically and high strength to fine cracks The purpose.

In order to achieve the above object, the crack reinforcing device according to an embodiment of the present invention is a pumping unit for pumping the reinforcement material is a suspension; An oscillating unit in communication with the pumping unit to vibrate the reinforcing material such that the particle (s) included in the reinforcing material introduced into the inlet side by the pumping unit are in an excited state; And a tip dispensing unit in communication with the outlet side of the excitation unit, for injecting the excited reinforcement into the object to be reinforced.

Crack reinforcement method according to another embodiment of the present invention is characterized in that the vibration frequency applied to the reinforcement in the excitation unit is within the range of 6Hz to 13.5Hz relative to the tip injection unit side.

Hereinafter, a crack reinforcing device according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 shows a block diagram of a crack reinforcement device according to an embodiment of the invention, and FIG. 2 shows a partial block diagram centering on the excitation unit and the adjustment unit of FIG. 1.

1 and 2, the crack reinforcing device includes a pumping unit 100, an excitation unit 200, and a tip injection unit 300.

The pumping unit 100 includes a reservoir 110 for storing the reinforcement. The reservoir 110 is provided with a stirrer (not shown) to agitate the reinforcement. The pumping pipe 120 extending from the reservoir 110 guides the reinforcement to the excitation unit 200 side. The pump 130 installed in communication with the pumping pipe 120 pumps toward the unit 200 having the reinforcing material stored in the storage container 110. Here, the reinforcing material may be a suspension type reinforcing material such as commonly used portant or general cement suspension. The pressure gauge 140, the flow meter 150, and the return valve 160 connected to the pumping pipe 120 are for controlling the amount of the reinforcing material being pumped or the pumping pressure, and those skilled in the art will not fully understand the bar.

The excitation unit 200 receiving the reinforcement pumped by the pumping pipe 120 includes a vibration generator 201. The vibration generator 201 applies vibration to the reinforcement. The reverse flow prevention unit 260 and the flow meter 270 may be installed at a position immediately before the reinforcing material is introduced into the vibration generator 201. The non-return unit 260 prevents the vibration or reinforcement of the vibration generator 201 from flowing back toward the pumping unit 100. A ball valve or the like may be used as the backflow prevention unit 260. The flow meter 270 may check the flow rate of the reinforcing material flowing into the vibration generator 201. The driving motor 250 provides a driving force for the movement of the vibrating rod 230 (see FIG. 3) movably disposed in the vibration generator 201. This will be described in more detail with reference to FIG. 3.

The reinforcing material excited in the vibration generator 201 is injected into the object 0 through the injection pipe 310 of the tip injection unit 300. Particulates of the excited reinforcement are excited or excited by vibrating energy, and the apparent viscosity of the reinforcement becomes lower than before the vibration is applied. By such a decrease in the apparent viscosity, the reinforcing material, which is a suspension of cements, can also be effectively injected into the fine crack (C).

Injecting the reinforcing material, the injection hole 510 is formed in the object (0). An injection casing 520 is inserted into the injection hole 510. When the injection pipe 310 is inserted into the injection casing 520 and the injection is performed, the packer 320 mounted on the injection pipe 310 and formed of a rubber material is expanded so that the tip 330 of the injection pipe 310 is expanded. The injection casing 520 is sealed so that the reinforcement injected from the back flow does not flow.

In order to control the reinforcement that is excited in the excitation unit 200 and injected into the crack C through the tip injection unit 300 to have a vibration frequency range that can maximize the injection effect, the crack reinforcement device is an adjustment unit 400. And may further include a frequency sensor 450.

The frequency sensor 450 is excited by the excitation unit 200 to detect the frequency of the reinforcing material injected into the crack (C) through the injection pipe 310. The vibration of the reinforcing material is attenuated while the injection pipe 310 is moved and injected into the crack C as compared with the vibration when the reinforcing material is excited in the unit 200. In order to measure the frequency of the frequency sensor 450 is used.

The attenuation vibration frequency of the reinforcing material sensed by the frequency detecting sensor 450 is detected by the frequency detector 410 of the adjusting unit 400. The frequency detected by the frequency detector 410 is transmitted to the contrast circuit 420 through the controller 430. The contrast circuit 420 contrasts the reference vibration frequency set for effective injection of the reinforcement material into the crack C and the attenuation vibration frequency detected through the actual frequency sensor 450.

If a difference occurs in the contrast result, the controller 430 adjusts the rotational speed of the drive motor 250 according to the difference. An amplifier 440 disposed between the controller 430 and the driving motor 250 amplifies a signal transmitted from the controller 430 to the driving motor 250. Here, the drive motor 250 is an inverter-type motor capable of adjusting the rotation speed, and thus the rotation speed may be adjusted by the controller 430.

Next, the vibration generator 201 will be described in detail with reference to FIG. 3.

3 is a longitudinal cross-sectional view of the vibration generator 201. Referring to FIG. 3, the vibration generator 201 includes first and second housings 210 and 220, a vibration rod 230, and a vibration plate 240.

The first housing 210 is a hollow body having a form extending in the longitudinal direction (up and down direction on the drawing). The internal space 211 formed inside the first housing 210 includes a vibration space 213 in which the vibration rod 230 is reciprocated in the longitudinal direction, and a reinforcement as a space below the vibration plate 240. It may be divided into an excitation space 213 which is an excitation space.

The vibration rod 230 is the reciprocating motion by the rotation of the drive motor 250 (see FIG. 2). The rotation is converted into a force for reciprocating the vibrating rod 230 in a substantially straight line by a cam or the like mounted on the rotating shaft of the drive motor 250. The structure of the cam or the like will be readily understood by those skilled in the art, and will not be described further.

The second housing 220 is mounted to the outside of the first housing 210 in a manner that surrounds the first housing 210. An inlet 215 connected to the pumping pipe 120 (refer to FIG. 1) is formed above the second housing 220. The reinforcing material introduced into the inlet 215 is introduced into the space 213 through the inflow passage 221 formed between the first and second housings 210 and 220. The inflow passage 221 includes an annular passage 222 formed to surround the outer circumference of the substantially circular cross section of the first housing 210 on the inlet 215 side. At least one length passage 223 communicating with the annular passage 222 is formed at a point spaced at an angle along the circumferential direction of the annular passage 222. The length passage 223 extends along the movement direction of the vibration rod 230.

The discharge port 225 is formed at the other end of the length passage 223. The discharge direction D of the reinforcing material discharged into the space 213 provided in the discharge port 225 intersects with the vibration direction V of the diaphragm 240 and becomes a vertical direction in this drawing. This means that the excitation space 213 is spaced apart from the length passage 223. Due to this arrangement, it is difficult for the reinforcing material subjected to vibration in the excitation space 213 to flow back to the inflow passage 221. In the present embodiment, four length passages 223 and discharge holes 225 are formed at a 90 degree angle, but only two length passages 223 and three discharge holes 225 are shown in this cross-sectional view.

The diaphragm 240 is disposed substantially perpendicular to the direction in which the vibrating rod 230 reciprocates at a position capable of receiving a force by the vibrating rod 230. The diaphragm 240 is a part which generates vibration continuously by the force of the vibration rod 230, and has elasticity and ductility necessary for generation of vibration. A buffer member 241 may be interposed between the diaphragm 240 and the first housing 210. The shock absorbing member 241 relieves the vibration generated in the diaphragm 240 from being transmitted to the first housing 210. The vibration generated by the diaphragm 240 is applied to the reinforcing material introduced into the excitation space 213 through the discharge port 225.

The reinforcing material excited in the excitation space 213 is guided to the tip injection unit 300 by the guide portion 216 connecting the outlet 217 and the outlet 217 side. The guide direction I through which the reinforcing material is guided preferably coincides with the vibration direction V. Accordingly, the progress of the reinforcement to the tip injection unit 300 in the process of applying vibration to the reinforcement is not limited.

Next, referring to FIGS. 4 to 6, the range of the reference vibration frequency set in the contrast circuit 420 (see FIG. 1 above) to maximize the injection efficiency of the reinforcing material for the crack C will be described. .

Figure 4 discloses a perspective view of an artificial test specimen 600 for testing the injection performance of the reinforcement to the crack. Referring to this figure, the artificial test specimen 600 includes upper and lower plates 610 and 620 and a pair of spacers 630 disposed therebetween. By the spacer 630, a predetermined interval, that is, an injection interval 650, is formed between the upper and lower plates 610 and 620. The injection interval 650 is an artificial space corresponding to the crack C of FIG. 1.

One side of the injection gap 650, the right end side in the drawing is connected to the injection pipe 310. The injection pipe 310 is configured to transfer the excitation reinforcement in the excitation unit 200 (see FIG. 1, etc.) as described above. The reinforcement injected at one end side of the injection interval 650 proceeds along the injection interval 650 and is discharged to the other end side of the injection interval 650, the left end in the drawing.

First, the penetration rate into the injection interval 650 according to the frequency range of the excitation vibration of the suspension-type reinforcement with the ratio of water and general cement 2: 1 is examined. Here, the length of the injection interval 650 is 280 cm, and the height (interval) is 0.1 mm.

Frequency (Hz) 0 5 7.5 10 12.5 15 17.5 20 Initial passage speed (cm / sec) 11.66 15.56 21.54 18.67 20.00 17.50 18.67 17.50 100 (ml) 2.98 4.52 8.75 7.00 6.51 5.38 5.28 5.00 200 (ml) 1.53 2.46 4.52 3.64 3.46 2.89 2.75 2.43 300 (ml) 1.00 1.63 3.08 2.22 2.24 1.87 1.77 1.56 400 (ml) 0.75 1.20 2.28 1.65 1.63 1.36 1.29 1.13 500 (ml) 0.59 0.96 1.78 1.32 1.29 1.06 0.98 0.89

Referring to Table 1 and the graph of the results thereof, when the frequency of 7.5 is applied, the average passage or penetration rate while the injection amount 100 passes through the injection interval 650 is 8.75. This is equivalent to three times the penetration rate 2.98 when the frequency is zero (no vibration). This result is irrelevant to the change of injection amount of reinforcement. In other words, it leads to the conclusion that the penetration rate of the reinforcement with the frequency 7.5 for the injection spacing 650 is approximately three times that of the frequency zero (no vibration).

Furthermore, when the injection amount is 100, if the frequency range is 6 to 13.5, the penetration rate of the reinforcement is at least 6. Penetration rate 6 is twice the rate of penetration 2.98 in the absence of excitation.

As a result, the vibration frequency for having the reinforcing material is 7.5 is most preferable because the highest penetration speed can be obtained. However, even if the frequency range is 6 to 13.5, the penetration rate is about twice that of the case where no vibration is applied, and the penetration rate reaches 68% even when the frequency is 7.5. have.

Next, the penetration rate into the injection interval 650 according to the frequency range of the excitation vibration of the suspension-type reinforcement in which the mixing ratio of water and the ultrafine particle (micro) cement is 1: 1 is described. Here again, the injection interval 650 has a length of 280 cm and a height (interval) of 0.1 mm.

Frequency (Hz) 0 5 7.5 10 12.5 15 17.5 20 100 (ml) 1.94 2.56 5.00 4.30 3.11 3.18 3.41 2.71 200 (ml) 0.97 1.41 2.20 2.13 1.62 1.76 1.64 1.51 300 (ml) 0.66 0.96 1.37 1.31 1.10 1.12 1.10 1.03 400 (ml) 0.49 0.71 0.98 0.95 0.84 0.85 0.83 0.78 500 (ml) 0.38 0.56 0.76 0.73 0.67 0.67 0.66 0.64

Referring to Table 2 and FIG. 6 graphing the results, when the frequency of 7.5 is applied, the passage or penetration rate while the injection amount 100 passes through the injection interval 650 is 2.00. This is equivalent to 2.5 times the penetration rate 1.94 in the case where the frequency is zero (no vibration). This result is almost independent of the change in injection amount of stiffeners as in the case of the conventional cement suspension. In other words, it leads to the conclusion that the penetration rate of the reinforcement with the frequency 7.5 for the injection spacing 650 is approximately 2.5 times as compared to the case where the frequency is zero (without vibration).

Furthermore, when the injection amount is 100, if the frequency range is 5.5 to 15, the penetration rate of the reinforcement is at least 3.2. The penetration rate 3.2 is about 1.65 times the penetration rate 1.94 in the absence of excitation.

As a result, the vibration frequency for having the reinforcing material is 7.5 is most preferable because the highest penetration speed can be obtained. However, even if the frequency range is 5.5 to 15, it can be said to have a penetration speed of 1.65 times or more compared to the case where no vibration is applied, and a penetration rate of 65% even when the frequency is 7.5. .

From the experimental results for the above-mentioned general cement suspension and micro cement suspension, it can be seen that the vibration frequency of the reinforcing material is most preferably 7.5. Furthermore, if the common frequency range is 6 to 13.5 in the above two cases, the penetration rate at that time is also a range that can be adopted at an appropriate level to reach 2/3 of the penetration rate at the vibration frequency 7.5.

As described above, the crack reinforcement device and the crack reinforcement method using the same according to the present invention has an excitation unit for causing the reinforcement material injected into the crack, so that it is difficult to penetrate the fine crack, Lower the apparent viscosity so that they can also be effectively injected into the microcracks.

Since the cement suspension is inexpensive or high strength can be expressed, the crack reinforcement device according to the present invention can be used to construct a crack reinforcement work cheaper and more durable.

In addition, the vibration generator according to the present invention is formed so that the excitation reinforcement with the excitation direction for the reinforcing material coincides with the guiding direction guided to the tip injection unit, thereby preventing the excitation process from becoming an obstacle in the progress of the reinforcement.

Furthermore, the vibration generator according to the present invention is formed so as to surround the inflow passage in which the reinforcement is introduced into the vibration space with the vibration space having the reinforcing material, structural reinforcement of the reinforcing material excited in the vibration space to the inflow passage, etc. To prevent it.

In addition, the vibration generator according to the present invention can control the feedback (feed-back) to generate a vibration in the highest frequency range of the penetration rate of the reinforcing material to the crack, it is possible to shorten the crack reinforcement process more.

In the above described with reference to the accompanying drawings, the crack reinforcing device according to the present invention, the present invention is not limited by the embodiments and drawings disclosed herein, but by those skilled in the art within the scope of the technical idea of the present invention Various modifications may be made.

Claims (16)

A pumping unit for pumping a reinforcement which is a suspension; An oscillating unit in communication with the pumping unit to vibrate the reinforcing material such that the particle (s) included in the reinforcing material introduced into the inlet side by the pumping unit are in an excited state; And And a tip / injection unit in communication with the outlet side of the excitation unit for injecting the excited reinforcement into the object to be reinforced. The method of claim 1, The suspension is a mixture of cement and water, The pumping unit, An agitator for stirring the suspension; A pump for receiving and pumping the stirred suspension; And And a pumping pipe connecting the pump and the exciter to guide the pumped suspension to the inlet side of the excitation unit. The method of claim 1, The unit having the above, And the excitation direction of the reinforcing material is configured to coincide with the guide direction in which the excited reinforcing material is guided to the tip injection unit. The method of claim 1, The unit having the above, A first housing having an inner space accommodating a vibration rod reciprocating in one direction; A diaphragm mounted to the first housing so as to be located in the inner space, the diaphragm generating vibration in association with the reciprocating motion of the vibrating rod; A second housing coupled to surround the first housing and forming an inflow passage through which the reinforcing material is introduced into the internal space from the inlet; And And a guide portion which is formed to communicate the internal space and the outlet, and guides the reinforcing material introduced into the internal space to the tip injection unit connected to the outlet side. The method of claim 4, wherein The diaphragm is disposed perpendicular to the one direction, The guide portion is crack reinforcement device characterized in that it is formed to guide the excited reinforcement along the direction corresponding to the one direction. The method of claim 4, wherein The inflow passage, An annular passage formed along the circumferential direction of the first housing; And And a plurality of length passages extending and spaced apart from the internal space at points spaced at a predetermined angle along the circumferential direction of the annular passage. The method of claim 4, wherein And a discharge direction of the reinforcement material discharged into the inner space by the inflow passage is a direction crossing the excitation direction of the reinforcement material by the vibration rod. The method of claim 4, wherein And a buffer member interposed between the diaphragm and the first housing to cushion the vibration transmitted to the first housing by the vibration of the diaphragm. The method of claim 4, wherein Arranged to interlock with the vibration rod, the crack reinforcement device further comprising a drive motor for driving the vibration rod to reciprocate. The method of claim 9, The drive motor is a crack reinforcement device, characterized in that the inverter motor capable of controlling the rotational speed. The method of claim 10, A frequency sensing sensor mounted on the tip injection unit to measure the attenuated vibration frequency of the reinforcing material injected into the object; And a control unit for adjusting the rotational speed of the drive motor so that the attenuation vibration frequency detected by the frequency detection sensor corresponds to the set reference vibration frequency. The method of claim 11, The reference vibration frequency is crack reinforcement device, characterized in that within the range of 6Hz to 13.5Hz. The method of claim 4, wherein And a backflow prevention unit installed at an inlet side of the excitation unit to prevent the reinforcement and vibration from flowing back to the pumping unit side, wherein the backflow prevention unit is a ball valve. The method of claim 1, The tip injection unit, An injection pipe connected to the outlet of the excitation unit; And And a packer mounted on the free end side of the injection pipe. As a crack reinforcement method using a crack reinforcement device according to claim 1, And the vibration frequency applied to the reinforcement in the excitation unit is within the range of 6 Hz to 13.5 Hz with respect to the tip injection unit side. The method of claim 15, The vibration frequency is crack reinforcement method, characterized in that 7.5Hz.

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