KR100477572B1 - An agitating device for improving ground and an method for improving ground using the same - Google Patents

Abstract

The present invention relates to a ground improvement stirring device, wherein a high binder supply pipe is formed in an axial direction inside an auger shaft, and the ground improvement stirring device provided with a stirring blade in the middle of an outer circumferential surface of the auger shaft, wherein the tip of the auger shaft is downward. After extending by a predetermined length, a hollow cylindrical accommodating part having an open lower portion is formed at the extended tip, and an accommodating feed tube connected to the high dispensing drug supply pipe is formed in the accommodating part to the vicinity of the distal end of the accommodating part, An air supply pipe is formed inside the auger shaft in parallel with the high drug supply pipe, and a well-known excavation hammer is connected to the air supply pipe by a predetermined coupling means inside the accommodating portion, and the auger shaft and the accommodating portion are connected to each other. A feed screw is formed on the outer circumferential surface, and an excavation is performed on the outer circumferential surface of the tip of the receiving portion. Characterized in that the dog is arranged, in the interior of the drilling wing-bonding agent one after another through the air outlet to the anti-caking agent supply tube formed.

Description

Ground Agitation Device and Method for Improving Ground Using It {AN AGITATING DEVICE FOR IMPROVING GROUND AND AN METHOD FOR IMPROVING GROUND USING THE SAME}

The present invention relates to a ground improvement agitator and a ground improvement method using the same, and more particularly, the rock layer of weathered rock, soft rock, granite, etc. existing in the ground to be improved, or a rock layer such as amber stone is hardly applied to the axle. The present invention relates to a ground improvement stirrer equipped with an excavation hammer at the tip of an auger shaft so as to quickly and without crushing excavation to make an improved mixture of a high binder and an improved ground soil.

In general, when constructing a structure directly on the ground, if the ground is soft ground composed of soft soil such as sea clay, stratified clay, etc. due to the topographical characteristics, the ground is improved and reinforced, and the order of the embankment, landfill, etc. In the case of the need for the construction of vertical barrier walls in the ground.

In the ground improvement stirring device used for the improvement of the soft ground and the formation of the vertical water order wall, after the auger shaft digs the ground to be improved to a desired depth, a high binder such as cement paste or solidified material is removed when the auger shaft is pulled out. Iii) is sprayed through the improver ejection opening formed at the tip of the auger shaft, and the ground to be improved is formed by mixing and stirring the improved soil and the high binder.

However, in digging into the ground to be improved, when rock layers such as weathered rock and soft rock or stony layers such as amber stones exist in the ground to be improved, such rock layers or stone layers must be dug into and improved.

In order to dig into the rock layer and the stone layer, in the prior art disclosed in Japanese Patent Laid-Open No. Hei 1-219210, an excavation head 24 is provided at each tip of the auger shafts 21 and 22.

The conventional ground improvement agitation device disclosed in Japanese Patent Laid-Open No. 1-219210 is suspended from the crossbar 30 fixed to the reader 28 of the crawler crane 27, as shown in FIGS. 7 and 8. And a drive device 2 and a branch transmission device 4 freely installed in Shanghai East according to the guide rail 29 of the reader 28, a rotary spindle 3 connecting the two devices, and the rotary spindle and auger. A plurality of distribution boxes 14, 15, and 16 through which shafts 21 and 22 are fitted are provided.

The stirring blade 23 is provided in the middle of each outer peripheral surface of the auger shaft 21, 22, and the excavation head 24 is provided in the front-end | tip of each of the auger shaft 21, 22. As shown in FIG.

And each auger shaft (21, 22) has a high drug supply pipe (21a, 22a) is formed therein, and the agglomeration passes through the high drug supply pipe (21a, 22a) at the rear end of the auger shaft (21, 22) The chemical | medical agent inflow ports 21b and 22b are formed, and the high chemical | medical agent injection openings 21c and 22c which connect to the high chemical supply pipes 21a and 22a are formed in the front-end | tip of the auger shaft 21 and 22, respectively. The high drug agent, which is conveyed by the high drug agent supply device (not shown), is distributed in the distribution boxes 15 and 15 through the high drug agent supply hose 17, and then the high drug agent inlet 21b, 22b and the high drug supply pipe ( 21a, 22a are injected from the high drug ejection outlets 21c, 22c and injected into the ground.

Therefore, as the auger shafts 21 and 22 rotate while descending, the excavation head 24 and the stirring blade 23 rotate, and the soil to be improved and the high binder are mixed to improve the ground.

On the other hand, when a rock layer such as weathered rock or soft rock or a rock layer such as amber is present in the ground to be improved, the excavation bit of the excavation head 24 provided at each tip of the auger shafts 21 and 22 is the rock layer or the stone. Dig in while scraping off the layers.

However, in the conventional ground improvement agitator, the excavation bit of the excavation head 24 scrapes the rock layer or the stone layer little by little, so that the excavation work speed is slow, and the excavation bit of the excavation head 24 is applied to the rock layer or the stone layer. In contact with the auger shaft 21 and 22 while rotating in accordance with the rotation of the rock layer or the stone layer, the force is applied to the auger shaft 21, the auger shaft 21, 22 may be damaged.

In particular, the conventional ground improvement stirrer cannot be improved to the depth of the ground requiring the ground to be improved when the rock layer or the stone layer cannot be penetrated. Therefore, the improved body made by the conventional ground improvement stirring device also has a problem that the ordering action is not properly performed when the improved body is constructed as a vertical order wall because the lower tip thereof is not formed to a sufficient depth.

The present invention is to solve the above problems, without breaking the rock layer or all rock layer in the ground to be improved without giving excessive force to the axle, the high binder and the ground to be improved sufficiently stirred and mixed to the required depth One object of the present invention is to provide an agitator for improving the ground, which is equipped with an excavation hammer at the tip of the auger shaft to make an improved body.

Another object of the present invention is to provide a method for improving a ground using the above-described ground stirring device.

In the ground improvement stirring device of the present invention for achieving the above object of the present invention, a high binder supply pipe is formed in the axial direction inside the auger shaft, the ground improvement stirring device is provided with a stirring blade in the middle of the outer peripheral surface of the auger shaft According to claim 1, the end of the auger shaft extends downward by a predetermined length, and a hollow cylindrical accommodating portion having a lower opening is formed at the elongated tip, and a high dispensing agent supply pipe communicating with the high dispensing drug supply pipe is formed inside the accommodating portion. It is formed up to the front end of the receiving portion, the inside of the auger shaft is formed with an air supply pipe in parallel with the high binder supply pipe, the inside of the receiving portion is coupled to the air supply pipe by a known drilling hammer by a predetermined coupling means And a feed screw is formed on an outer circumferential surface of the auger shaft and the accommodation portion, Excavation wings are disposed on the outer peripheral surface of the tip, and a high drug ejection outlet is formed in the excavation wing to communicate with the high drug supply supply pipe.

Moreover, the ground improvement method by this invention is characterized by improving a ground using the above-mentioned ground improvement stirring apparatus.

Hereinafter, an embodiment of the ground improvement stirring device according to the present invention will be described in detail with reference to the drawings. For the same components as those of the prior art in the ground improvement stirring device according to the present invention, the same reference numerals as those used in the conventional ground improvement stirring device are used, and the same components as those of the prior art components are used. The description is omitted.

As shown in Figures 1 to 4, in the ground improvement stirring apparatus according to the present invention, a hollow cylindrical receiving portion 110 is formed at the tip of the auger shaft 21, this hollow cylindrical receiving portion 110 ) Is a well-known drilling hammer 200 is mounted.

The basic configuration of the auger shaft 21 in the ground improvement stirring device is composed of a high binder supply pipe (21a) and the stirring blade (23). The high binder supply pipe 21a is formed axially inside the auger shaft 21, and the stirring blade 23 is provided in the outer peripheral surface of the auger shaft 21. As shown in FIG.

In this embodiment, after the front end of the auger shaft 21 extends downward by a predetermined length, a hollow cylindrical accommodating portion 110 is formed in the extended front end thereof with its lower portion opened. The inside of the accommodating part 110 is provided with the high caking drug supply pipe 111 connected to the high caking drug supply pipe 21a of the auger shaft 21 to the vicinity of the front end of the accommodating part 110.

In addition, the air supply pipe 120 is formed inside the auger shaft 21 in parallel with the high drug supply pipe 21a.

In addition, a female screw portion 115 is formed in the upper inner center of the accommodating portion 110 so as to be connected to the air supply pipe 120 of the auger shaft 21. The male screw portion 216a is formed at the rear end of the drilling hammer 200 as described in detail below. The female screw portion 115 of the receiving portion 110 and the male screw portion 216a of the drilling hammer 200 function as coupling means for coupling the receiving portion 110 and the drilling hammer 200 to each other. It will be appreciated that any other coupling means is possible without being limited thereto.

Moreover, the excavation blade 24 is arrange | positioned at the outer peripheral surface of the front end of the accommodating part 110. FIG. The diameter of the stirring blade 23 and the excavation blade 24 may vary depending on the soil conditions of the ground to be improved.

As shown in detail in FIG. 3, the excavation wing 24 is formed in an S shape including a first curved portion 241 having a concave bottom surface and a second curved portion 243 having a convex lower surface formed thereon. 243 extends to the rear end of the first bent portion 241. Further, an excavation bit 24a is formed on the bottom surface of the tip of the first bent portion 241.

In addition, in the excavation wing 24, a high drug ejection outlet 140 connected to the high drug supply supply pipe 111 is formed up to the tip of the first bent portion 241.

According to this structure, when the auger shaft 21 digs into the soil to be improved downward while rotating clockwise as viewed from above, the tip of the first bent portion 241 can more easily dig into the soil to be improved. In addition, when the auger shaft 21 is pulled out of the improvement target soil while rotating counterclockwise as viewed from above, the second target portion 243 is the target soil being mixed with the high binder sprayed from the high drug ejection outlet 140. The rear end of) may be compacted.

Excavation hammer 200 coupled to the receiving portion 110 formed on the tip of the auger shaft 21 is known, in this embodiment is illustrated as using a pneumatic drilling hammer 200 as an excavation hammer, hydraulic drilling A hammer, an electric drilling hammer, or the like may be applied.

As shown in detail in FIG. 4, the pneumatic drilling hammer 200 includes a sleeve 210 into which compressed air is introduced through an air inlet hole 216b of a coupling head 216 fitted to a rear end thereof, and an air inlet hole ( Check valve 280 for selectively opening and closing the check end 216c formed in the coupling head 216 by the action of the compressed air and spring 182 introduced through the 216b, the check valve 280 is in the longitudinal direction A valve chest 270 having a valve guide portion 272 mounted to be slidably and having a plurality of recess grooves 274 through which compressed air passes, and a valve 260 fitted to an outer circumferential surface of the rear end thereof. In the circumferential direction, the valve seat 250 in which a plurality of circumferential holes 254 are formed and the compressed air introduced along the outer circumferential surface of the valve seat 250 slide in the longitudinal direction along the inner wall of the sleeve 210. A piston 230 that is movably mounted, the piston The rear end portion 233 of the 230 is a rock layer formed by a plurality of protrusions 222 of the inner end 240 while the inner cylinder 240 is slidably embedded, and the piston 230 is repeatedly moved along the longitudinal direction. The hammer bit 220 to strike the strike, and the chuck 212 is coupled to the front end of the sleeve 210 to move the hammer bit 220 in the longitudinal direction.

On the outer circumferential surface of the rear end of the coupling head 216 coupled to the rear end of the sleeve 210, a male screw portion 216a for engaging with the female screw portion 115 of the receiving portion 110 is formed. In addition, the coupling head 216 is hermetically screwed to the rear end of the sleeve 210 via the O-ring 284. The valve rear end 280b of the check valve 280 that selectively blocks the inflow of compressed air has a structure capable of closing the check end 216c of the coupling head 216, and has a spring at the valve front end 280a. 282 is fitted.

An O-ring 288 is fitted to the rear end of the valve seat 250 to maintain airtightness with the valve chest 270, and an O-ring 286 for airtightness with the inner cylinder 240 is fitted on the outer circumferential surface thereof. Inside the piston 230 is formed a through hole 234 through which compressed air introduced along the outer circumferential surface of the valve seat 250 strikes the piston 230 and then passes through. The rear end of the through hole 234 is guided to slide in the longitudinal direction while being inserted into the piston guide part 252 formed at the front end of the valve seat 250. Similarly, the front end of the through hole 234 is guided to slide along the longitudinal direction while being inserted into the piston guide part 228 formed at the rear end of the hammer bit 220.

The rear end portion 233 of the piston 230 has its outer peripheral surface sliding along the inner wall of the inner cylinder 240, and the middle portion 236 of the piston 230 also has its outer peripheral surface extending the inner wall of the sleeve 210. Sliding along, and directly to the price end 226 of the hammer bit 220 through the tip 232. A plurality of through holes 242 and 244 are formed at the front end of the inner cylinder 240 into which the rear end 233 of the piston 230 is inserted. The outer peripheral surface of the rear end of the hammer bit 220 is moved along the length direction in a state supported by the bit ring 214. An air discharge hole 224 is formed in the hammer bit 220 to be connected to the through hole 234 of the piston 230.

In FIG. 5, the inner cylinder 240 is shown in detail as a perspective view. As shown in FIG. 5, the outer circumferential surface of the valve seat 250 is provided with a plurality of grooves 258 by a plurality of protrusions 256. In operation, compressed air introduced through the groove 258 is supplied downward. In addition, a plurality of through holes 242 and 244 are formed below the inner cylinder 240. Among these, the upper second row through hole 244 is arranged to cross the lower first row through hole 242 in the circumferential direction, and is formed less than the first row through hole 242.

In FIG. 6, the hammer bit 220 is shown in detail as a perspective view. As shown in FIG. 6, the outer circumferential surface of the price end 226 of the hammer bit 220 is provided with a plurality of protrusions. In addition, a screw portion 212a screwed to the tip of the sleeve 210 is formed on the outer circumferential surface of the chuck 212 that is splined to allow the hammer bit 220 to move in the longitudinal direction.

In the pneumatic drilling hammer configured as described above, when the compressed air supplied from the compressor through the air supply pipe 120 is introduced through the inlet hole 216b of the coupling head 216, the spring 282 is compressed by pneumatic check valve The check end 216c blocked by the rear end 280b of 280 is opened. The compressed air introduced into the open gap passes through the groove 274 formed in the valve chest 270 and the groove 258 of the valve seat 250 in order, and then the first row through hole 242 of the inner cylinder 240. Through the impact on the rear end surface of the middle portion 236 of the piston 230. At this time, since the second row through hole 244 of the inner cylinder 240 is blocked by the rear end 233 of the piston 230, the compressed air is a through hole of the piston 230 through the second row through hole 244. 234 does not flow.

When the compressed air impinges on the rear end surface of the middle portion 236 of the piston 230 through the first row through hole 242 of the inner cylinder 240, the piston 230 follows the inner wall of the inner cylinder 240. While advancing rapidly, the hammer bit 220 is pushed forward by vigorously hitting the price end 226 of the rear end of the hammer bit 220 through the tip end 232 of the piston.

When the ground layer to be improved is a rock layer such as a weathered rock layer or soft rock layer or a rock layer such as amber stone, when compressed air is supplied at a high pressure, the hammer bit 220 advances along the inner wall of the chuck 212 at high speed and adheres to the tip. The rock layer is crushed by hitting the rock layer or the rock layer through the plurality of protrusions 222. The hammer bit 220 which discharges the compressed air after striking the rock layer or the rock layer retreats upward by recoil.

The method of crushing the rock layer or the stone layer by the hammer bit 220 can crush the rock layer or the stone layer much more quickly than the method of scraping the rock layer or the stone layer by the conventional drilling head. However, since the tip of the auger shaft 21 does not rub against the rock layer or the stone layer, there is no fear that excessive force is not applied to the auger shaft 21 and the auger shaft 21 is not damaged.

When the piston 230 advances downward, the second row through hole 244 blocked by the rear end 233 of the piston 230 is opened, and the compressed air continues to be supplied, so that the piston 230 moves downward. In this state, the compressed air is introduced into the through hole 234 of the piston 230 through the second row through hole 244 and then discharged downward of the hammer bit 220 through the air discharge hole 224. Therefore, the compressed air discharged downward of the hammer bit 220 through the air discharge hole 224 serves to push the rock fractured by the hammer bit 220 upwards, so that the hammer bit 220 performs excavation work. Allow you to continue.

Compressor for supplying compressed air to the ground improvement agitator is to be mounted separately to the ground improvement agitator, which has not been described in detail herein, and the air supply pipe 120 of the auger shaft 21 is connected to the compressor. You will see that.

In addition, since the compressed air discharged below the hammer bit 220 serves to disturb and disrupt the ground to be ground to be improved, the ground to be ground is more finely ground.

In addition, a conveying screw 130 is formed on the outer circumferential surface of the accommodating part 110. The feed screw 130 that rotates according to the rotation of the auger shaft 21 pulls up the ground to be ground to be improved, so that the hammer bit 220 can continue the excavation work.

As the auger shaft 21 is lifted when the auger shaft 21 is lifted, the high drug ejected from the high drug ejection outlet 140 of the excavation wing 24 and the high drug ejection outlet 113 of the receiving part 110 is auger shaft ( 21 is rotated so that the excavation blade 24, the feed screw 130 and the stirring blade 23 is mixed with the soil to be improved. In particular, in the present invention, the soil to be improved by being crushed and crushed by the hammer bit 220 of the excavation hammer 20 is solidified by the excavation blade 24, the conveying screw 130, and the stirring blade 23. Since stirring and mixing with a chemical | medical agent are carried out, the agitation of the soil to improve and a high binder are fully made.

In addition, the diameter of the tip portion of the hammer bit 220 may vary depending on the soil conditions of the ground to be improved. For example, if the ground to be improved consists only of soft soil such as sea urchin clay and measured clay, the highly viscous soil can adhere to the hammer bit and weaken the vertical vibration of the hammer bit, so that the diameter of the hammer bit is reduced. do. On the other hand, if there is a rock layer such as weathered rock or soft rock or a rock layer such as amber stone in the ground to be improved, the crushed rock layer or stone layer does not adhere to the hammer bit and there is no fear of weakening the vertical vibration of the hammer bit. Increase the diameter of the hammer bit.

Here, the ground to be improved primarily by the hammer bit 220 is secondaryly drilled by the drilling bit 24a of the drilling blade 24 having a larger diameter than the hammer bit 220. As described above, the excavation blade 24 having the same diameter as the stirring blade 23 has the edge of the ground hole to be improved primarily by the hammer bit 220, that is, the diameter and the excavation wing of the hammer bit 220. Since the excavation bit 24a scrapes and crushes the ground to be improved between the diameters of 24, even if a rock layer or a rock layer exists in the ground to be improved, it can be easily broken.

In addition, in the present invention, a high fire extinguishing agent manufactured by Steel Ceramic Co., Ltd., located in Taein-dong, Gwangyang-si, Jeollanam-do, may be used under the trade names "POS-101", "POS-102", or "POS-103". This fire is a product of environmental certification mark KLEA-94. It is not only an environment-friendly product, but also has excellent short- and long-term strength and excellent water-resistance and chemical resistance, so it is an excellent ground gauge (permeability coefficient K = 10 ^-7). cm / sec or less).

As described above, according to the ground improvement stirring device of the present invention, the rock layer is excavated and excavated by the hammer bit of the excavation hammer during the ground improvement, so that the rock layer can be quickly excavated and excavated without applying excessive force to the axle shaft. In addition, since the ground to be improved can be sufficiently excavated to the required depth, the order of improvement can be improved, and the ground to be fed with the feed screw and the stirring blade can be fed in a completely crushed state. Agitation of the ground to be improved by the blades and the high binder can be made sufficiently.

1 is a cross-sectional view of the coupling of the ground stirring device according to the present invention,

Figure 2 is an exploded cross-sectional view of the ground improvement stirring device according to the present invention,

3 is an enlarged perspective view of the stirring blade in FIG.

4 is an enlarged cross-sectional view of a pneumatic drilling hammer as an excavation hammer mounted to the auger shaft tip of the ground improvement stirring device according to the present invention;

5 is a perspective view of the inner cylinder of the components constituting the pneumatic drilling hammer of FIG.

6 is a perspective view of a hammer bit of the components constituting the pneumatic drilling hammer of FIG.

7 is a side view of a conventional ground improvement stirring device, and

FIG. 8 is a front view showing the ground improvement stirring apparatus of FIG. 7 in a partial cross section. FIG.

Claims (5)

In the ground improvement stirring device in which a high binder supply pipe (21a) is formed in the auger shaft (21) in the axial direction, and the stirring blade (23) is provided in the middle of the outer circumferential surface of the auger shaft (21), After the front end of the auger shaft 21 extends downward by a predetermined length, a hollow cylindrical accommodating part 110 having a lower opening is formed at the extended front end, Inside the accommodating part 110, a high caking drug supply pipe 111 connected to the high caking drug supply pipe 21a is formed to the vicinity of the tip of the accommodating part 110, An air supply pipe 120 is formed inside the auger shaft 21 in parallel with the high binder supply pipe 21a. Inside the accommodating part 110, a known drilling hammer 200 is connected to the air supply pipe 120 in series by a predetermined coupling means, Feed screw 130 is formed on the outer circumferential surface of the auger shaft 21 and the receiving portion 110, Excavation blade 24 is disposed on the outer peripheral surface of the tip of the receiving portion 110, Ground excavation agitation device, characterized in that the high blowing agent outlet 140 is connected to the high drug supply supply pipe 111 in the interior of the excavation wing (24). According to claim 1, The coupling means is composed of a female screw portion 115 formed in the upper inner center of the receiving portion 110 and a male screw portion 216a formed at the rear end of the drilling hammer 200, The female screw unit 115 is ground agitating device, characterized in that formed in communication with the air supply pipe (120). According to claim 1, The drilling hammer 200 is provided with a hammer bit 220 at the tip, The diameter of the tip portion of the hammer bit 220 is variable according to the soil conditions of the ground, The stirring blade (23) and the diameter of the excavation blade (24) is ground stirring device, characterized in that the variable according to the soil conditions. According to claim 1, The excavation blade 24 is formed in an S-shape consisting of a first curved portion 241 having a concave bottom surface and a second curved portion 243 having a convex lower surface extending from a rear end of the first curved portion 241. An excavation bit 24a is formed at the bottom end of the first bent portion 241, The high drug jet outlet 140 is ground stirring device, characterized in that formed up to the tip of the first bent portion (241). A method for improving the ground by using the ground improving stirring device according to any one of claims 1 to 4.