KR20100108995A - Extended grouting system and the method reinforcing groud using the sysetm - Google Patents

Abstract

PURPOSE: An extended grouting device and a construction method for reinforcing ground strength using the same are provided to easily control the diameter of a reinforcing part by controlling a rotation angle of an expansion member. CONSTITUTION: An extended grouting device comprises a first driver, a hollow rod casing(250), a first pressing unit, a second driver, a hollow inner rod(270), an expansion drill unit, and a drill unit(253). The first driver is movably formed in a support member. The rod casing is connected to the first driver and is rotated. The first pressing unit moves the rod casing. The second driver is movably formed in the support member. The inner rod is inserted into the rod casing. The expansion drill unit has a drill bit(2811). The drill unit is formed in the front end of the rod casing and is rotated with the rod casing.

Description

Expanded grouting device and ground strength reinforcement construction method using same {EXTENDED GROUTING SYSTEM AND THE METHOD REINFORCING GROUD USING THE SYSETM}

The present invention relates to an expansion grouting device for reinforcing the strength of the ground and a method for reinforcing the ground strength using the expansion grouting device, and more particularly, a hollow inner rod provided with a hollow rod casing and a road casing having a drill part. It is possible to form a reinforcing part with a large diameter, and it is possible to form a reinforcing part with a large diameter, and there is no fear of a defect occurring in the reinforcing part. An expansion grouting device capable of forming a section and a ground strength reinforcement construction method using the same.

In general, grouting is a method of injecting reinforcement into cracks or cavities for ground stability or leakage prevention in various civil works such as tunnel construction and retaining wall construction. After inserting the hollow tube having a plurality of ejection holes in the punctured state is a method of coagulating by forcibly injecting a reinforcing material such as cement milk or urethane through this.

In general, the grouting device is connected to a supply device for supplying the raw material to be mixed with the reinforcing material, the stirring device for stirring and mixing the raw material is supplied with the reinforcing material through the pump, and is connected to the control unit.

Figure 1 is a schematic side view showing a grouting device according to the prior art, Figures 2 to 5 shows a process of reinforcing ground strength using the grouting device according to the prior art, Figures 6 and 7 It is a longitudinal sectional view showing the rod provided in the grouting apparatus according to the prior art, Figure 8 is a sectional view showing a normal reinforcement, Figure 9 is a cross-sectional view for explaining a failure example of the reinforcement, Figure 10 is a conventional It is shown to explain the operation of the grouting device, Figure 11 is shown to explain an example of the swivel means provided in the grouting device according to the prior art.

As shown in FIG. 1, the grouting apparatus includes a main body 110 including a support 111 and a support member 113 provided on one side of the main body 100, and the support member. It consists of the rod 150 installed in 113. The support member 113 is a bar having a length provided in the main body 110. In FIG. 1, reference numeral 120 denotes a supply pipe.

The rod 150 has a supply passage 1511 formed in the longitudinal direction inward as shown in FIG. 6, and an injection hole 1515 communicating with the supply passage 1511 to one side of an upper side (right side in FIG. 6). Is formed in the radial direction, and at least one of the injection holes 1517 communicating with the supply passage 1511 is formed in the radial direction. The injection hole 1517 is generally spaced up and down along the longitudinal direction of the rod 150 is formed with a plurality. The lower end of the rod 150 is provided with a drill portion 153 having one or more drill bits (1531). Inside the drill unit 153, a through hole 1533 communicating with the supply path 1511 is formed. In FIG. 6, 1513 illustrates an enlarged diameter part having a diameter formed in a part of the supply path 1511, and 1535 illustrates a blow hole formed at an end of the drill part 153.

As shown in FIG. 7, the air supply path 1522 may be formed in the longitudinal direction of the rod 150 in parallel with the supply path 1511. An air injection hole 1521 communicating with the air supply path 1517 is formed in a radial direction at an upper portion of the rod 150, and the other end of the air supply path 1517 communicates with the injection hole 1517. In FIG. 7, reference numeral 1519 illustrates a connection pipe provided in the enlarged diameter part 1513 to connect the supply path 1511.

As shown in FIG. 11, a swivel 140 (Swivel) is provided at an upper end of the rod 150. The swivel portion 140 is composed of a swivel body 141 is rotatably fitted to the top of the rod 150. An O-ring groove is formed between the inner diameter portion of the swivel body 141 and the outer diameter portion of the rod 150 to provide one or more O-rings 142. One or more recesses are formed in the rod 150 along the circumferential direction as a portion to be inserted into the swivel body 141. When the supply path 1511 and the air supply path 1517 are formed in the rod 150, a first recess 1516 is formed as a portion in which an injection hole 1515 communicating with the supply path 1511 is formed. The second concave portion 1526 is formed at a portion where the air injection hole 1521 is connected to the air supply path 1517. In addition, the swivel body 141 has a first insertion hole 143 connected to the first concave portion 1516 and a second insertion hole 145 connected to the second concave portion 1526 in a radial direction. Is formed. The first insertion hole 143 is connected to the supply pipe 121 to which the punched water or the reinforcement, which is pressurized water supplied from the pump (not shown), is connected, and the second insertion hole 145 is connected to the pump from the pump (not shown). The air supply pipe 123 through which the pressurized air is transferred is connected.

As shown in FIG. 10, the support member 113 includes a guide 115 and is installed to be movable in the longitudinal direction of the support member 113 along the support member 113 by the guide 115. The driver 130 is installed, the rod 150 is connected to the driver 130 is driven to rotate. As shown in FIG. 10, the driver 130 includes a hollow case 131, a drive gear 135 positioned in the case 131 and connected to a hydraulic motor 137, and the drive gear ( And a driven gear 133 which is driven in engagement with the 135). The rod 150 penetrates the case 131, and the driven gear 133 is installed at a portion of the rod 150 positioned in the case 131. A key or the like is inserted between the rod 150 and the driven gear 133 so that the driven gear 133 rotates integrally with the rod 150. In FIG. 10, between the casing 131, the rod 150, and the driven gear 133, a load generated in the longitudinal direction of the support member 113 and a load generated in the radial direction of the rod 150 are supported. Bearings are installed but the description is omitted.

The conventional grouting apparatus 100 further includes pressing means (not shown) for pressing and moving the rod 150 in the longitudinal direction of the supporting member 113. The pressing means is installed in parallel to the support member 113 in the longitudinal direction of the support member 113, one end is fixed to the support member 113 and the cylinder housing is provided in the cylinder housing reciprocating end It consists of the cylinder which consists of a cylinder rod fixed to this case 131. In addition, the sprocket (not shown) may be rotatably installed in the case 131, and may have a structure such as a winch that pulls the chain wound on the sprocket.

2 to 5 illustrate a method for reinforcing ground strength using a grouting apparatus according to the prior art, while pressing the rod 150 in a direction away from the ground surface S by pressing means as shown in FIG. The hole 130 is formed in the ground G by rotating with the driver 130. At this time, the punched water is introduced through the injection hole 1515, and the punched water H is formed while spraying the punched water into the jet hole 1535 of the drill part 153. As shown in FIG. 3, when the perforated portion H is formed to the construction depth, as shown in FIG. 6, the blocking member 1512 is introduced into the supply path 1511 to supply the supply path at the lower portion of the injection hole 1517. Block 1511.

As shown in FIGS. 4 and 5, the reinforcing material is introduced at high pressure (usually about 200 atm) through the injection port 1515, and the rod 150 is pressed in the direction toward the surface S by the pressing means. While rotating the rod 150 with the driver 130. The injected reinforcement is sprayed farther than the diameter of the punching portion H while being radially ejected through the injection hole 1517, as shown in Figures 6 and 7, the rod 150 is raised to have a cylindrical shape When the reinforcing material is sprayed and solidified, the reinforcing part 10 is formed in the ground G as shown in FIG. 8. At this time, in order to increase the injection distance, to form a reinforcing portion 10 having a larger diameter, as shown in FIG. 7, an air supply path 1522 may be formed to inject air together.

However, when the reinforcing portion 10 is formed by the conventional grouting apparatus 100, when the hardening portion 11 such as rock is present in the ground G as shown in FIG. 9, the reinforcing portion 10 is It could not be formed in the form of a cylinder, the strength of the ground (G) was not sufficiently reinforced, there was a problem that the reinforcing material must be injected at high pressure in order to increase the diameter of the reinforcing portion.

An object of the present invention is proposed to solve the above problems, and by having an extended drill portion extending in the radial direction of the rod casing, even if there is a hardened portion in the ground, no defect occurs in the reinforcement portion, It is an object of the present invention to provide a ground strength reinforcement construction method using an expansion grouting device and an expansion grouting device that does not need to supply air in order to increase the injection distance and increase the size of the reinforcement sufficiently.

In order to achieve the above object, the present invention includes a first driver which is guided by the support member of the main body installed on the ground and movable along the support member; A hollow road casing connected to the first driver and rotatably driven by the first driver and moving along the support member together with the first driver; First pressing means for moving the rod casing along a supporting member; A second driver guided by the support member and provided to be movable along the support member; Inserted into the inside of the rod casing is engaged by a screw portion, a portion of the road casing is exposed in the longitudinal direction, the exposed portion is connected to the second driver is driven to rotate by a second driver, the second swivel portion A hollow inner rod having a connection member rotatably connected by the hollow member, the supply passage being formed in a longitudinal direction, and having at least one injection hole communicating with the supply passage in a radial direction; An extension drill unit configured to increase or decrease the length of the rod casing in one or more radial directions and include one or more extension rods having drill bits, the rods being connected to the inner rod and the rod casing; It is provided on the front end of the rod casing to provide an expansion grouting device that includes a drill unit which rotates integrally with the rod casing and includes a drill bit.

In addition, the present invention is guided by the support member of the main body is installed on the ground and the first driver is provided to be movable along the support member; A hollow road casing connected to the first driver and rotatably driven by the first driver and moving along the support member together with the first driver; First pressing means for moving the rod casing along a supporting member; Second pressing means for moving the inner rod in the longitudinal direction of the rod casing; A connection member inserted into the rod casing in a longitudinal direction of the rod casing, connected to the second pressing means, and rotatably connected by a second swivel portion, wherein a supply path is formed in the longitudinal direction; A hollow inner rod having at least one injection hole communicating with the supply path in a radial direction; An extension drill unit configured to increase or decrease the length of the rod casing in one or more radial directions and include one or more extension rods having drill bits, the rods being connected to the inner rod and the rod casing; It is provided on the front end of the rod casing to provide an expansion grouting device that includes a drill unit which rotates integrally with the rod casing and includes a drill bit.

In addition, the present invention includes a hollow rod casing having a drill portion, a hollow inner rod provided inside the rod casing, and an extended drill portion connected to the rod casing and the inner rod and extending in a radial direction of the rod casing. Provides an extended grouting device.

In addition, the present invention, the road casing is formed with one or more long holes in the longitudinal direction; One end of the extension rod is rotatably installed on the rod casing by a hinge, the extension drill portion further comprises a connection rod rotatably connected to the connection member and the other end is rotatably connected to the extension rod. ; When the connecting member moves toward the lower end of the rod casing, the extension rod rotates about the hinge and the portion exposed to the outside of the rod casing through the long hole increases, so that the radial distance from the hinge to the end of the extension rod is increased. When the connecting member moves in a direction away from the lower end of the rod casing, the extension rod rotates about the hinge, and the portion exposed to the outside of the rod casing through the long hole decreases so that the hinge to the end of the extension rod is reduced. An expansion grouting device is provided in which the radial distance is reduced.

In addition, the present invention, the road casing is formed with one or more long holes in the longitudinal direction; One end of the extension rod is rotatably installed on the connection member by a hinge, the extension drill portion further comprises a connection rod rotatably connected to the rod casing and the other end is rotatably connected to the extension rod. So; When the connecting member moves toward the lower end of the rod casing, the extension rod rotates about the hinge and the portion exposed to the outside of the rod casing through the long hole increases, so that the radial distance from the hinge to the end of the extension rod is increased. When the connecting member moves in a direction away from the lower end of the rod casing, the extension rod rotates about the hinge, and the portion exposed to the outside of the rod casing through the long hole decreases so that the hinge to the end of the extension rod is reduced. An expansion grouting device is provided in which the radial distance is reduced.

In addition, the present invention, the connecting member is a hollow body, the supply passage is formed extending through the connection member in the longitudinal direction of the rod casing, the injection hole communicating with the supply passage is formed in the connection member, Through-holes are formed in the longitudinal direction of the road casing; One end is connected to the supply path to the lower end of the connecting member, the other end is connected to the through hole of the drill portion, and one end is connected to the injection hole and extends along the longitudinal direction of the extension rod to the extension rod. An expansion grouting device is provided that further includes a first guide tube that is fixed and has one or more nozzles.

On the other hand, the present invention is a construction method for reinforcing the strength of the ground by using the expansion grouting device, by driving the first driver to rotate the load casing while pressing the road casing in a direction away from the surface by drilling a hole in the ground Forming; Moving the connecting member toward the lower end of the rod casing to increase the radial distance from the hinge to the end of the extension rod; Increasing the radial distance from the hinge to the end of the extension rod and then rotating the load casing in a direction away from the surface; Rotating the rod casing while pressing the rod casing in a direction toward the surface of the reinforcing material through the supply path and spraying the reinforcing material through the nozzle; Moving the connecting member away from the lower end of the rod casing to reduce the radial distance from the hinge to the end of the extension rod; It provides a ground strength reinforcement construction method using an extended grouting device comprising the step of withdrawing the rod casing and the inner rod from the perforation of the ground.

In addition, the present invention is a construction method for reinforcing the strength of the ground by using the expansion grouting device, by pressing the road casing in a direction away from the surface while driving the first driver to rotate the road casing in the ground Forming; Moving the connecting member in a direction toward the lower end of the rod casing to increase a radial distance from the hinge to the end of the extension rod; Increasing the radial distance from the hinge to the end of the extension rod and then rotating the rod casing toward the surface and feeding the reinforcement through the feed passage to spray through the nozzle; Moving the connecting member away from the lower end of the rod casing to reduce the radial distance to the end of the extension rod; It provides a ground strength reinforcement construction method using an extended grouting device comprising the step of withdrawing the rod casing and the inner rod from the perforation of the ground.

In addition, the present invention, while driving the first driver to rotate the load casing while pressing the load casing in a direction away from the surface to form a perforated portion in the ground, the drill portion is introduced into the supply passage It provides a ground strength reinforcement construction method using an extended grouting device for forming a perforation while spraying to the tip of the drill through the through hole formed in the.

According to the ground strength reinforcement construction method using the expansion grouting device 200 and the expansion grouting device according to the present invention, it is possible to form a reinforcing part having a large diameter without increasing the reinforcing material injection pressure, and when there is a hardened part in the ground. The defect is not generated in the reinforcement portion is formed also, there is an effect that can easily adjust the diameter of the reinforcement portion by adjusting the rotation angle of the expansion member.

Hereinafter, with reference to the accompanying drawings, a ground strength reinforcement construction method using the expansion grouting device and the expansion grouting device according to the present invention will be described in detail. In the detailed description, the contents described in the prior art are omitted, and the same names are used for the components having the same function.

In the following description, the 'length direction' refers to the vertical direction in FIG. 12, and the 'radial direction' refers to a direction perpendicular to the longitudinal direction or a direction having an angle with respect to the length direction in FIG. 12, and 'top' refers to the length. Direction in the direction of the upper direction, 'lower' in the longitudinal direction, the lower end in the longitudinal direction, 'in the direction away from the indicator' to form a perforation, 'in the direction toward the indicator' It means the direction opposite to the direction to form.

FIG. 12 is a schematic illustration for explaining the expansion grouting apparatus according to the present invention, FIG. 13 is a view in the lateral direction of FIG. 12, and FIG. 14 is a schematic illustration for explaining the expansion grouting apparatus according to the present invention. FIG. 15 is a cross-sectional view taken along line AA of FIG. 12, FIG. 16 is a cross-sectional view of the inner rod taken along line AA of FIG. 14, and FIGS. 17 and 18 are grounds using an expanded grouting device according to the present invention. FIG. 19 is an enlarged view of part A of FIG. 18, and FIG. 20 illustrates another example of the expansion grouting device according to the present invention.

12, 13 and 20, the expansion grouting apparatus 200 according to the present invention is moved in the longitudinal direction of the support member 213 and the support member 213 along the support member 213. The first driver 230 and possibly connected to the first driver 230 and rotatably driven by the first driver 230 and the first driver 230 by a first pressing means (not shown). And a hollow rod casing 250 moving in the longitudinal direction of the supporting member 213, first pressing means (not shown) for moving the rod casing 250 along the supporting member 213, and a support. The second driver 260 is guided by the member 213 to be movable along the support member 213, and is connected to the second driver 260 to be rotated by the second driver 260. Inner rod 270 moving along the supporting member 213 together with the second driver 260. And a drill part 253 provided at the front end of the rod casing 250 to rotate integrally with the rod casing 250 and having a drill bit 2253, and to the inner rod 270 and the rod casing 250. Expansion drill unit 280 is installed to be connected.

As shown in FIGS. 12 and 20, the inner rod 270 is inserted into the rod casing 250 and engaged with the threaded portion 290, and part of the inner rod 270 is exposed in the longitudinal direction of the rod casing 250. The exposed portion is connected to the second driver 260. The screw portion 290 includes a female screw portion 291 formed inwardly of the rod casing 250, and a male screw portion 293 engaged with the female screw portion 291 and formed outside the inner rod 270. The female screw portion 291 is formed in a portion of the rod casing 250 in the longitudinal direction, and the male screw portion 293 is also formed in a portion of the inner rod 270 in the longitudinal direction. In the portion where the female screw portion 291 and the male screw portion 293 are not formed, a space portion 256 is formed between the inner rod 270 and the rod casing 250 as shown in FIGS. 14, 16, and 20. The space part 256 may be provided with a bushing 278.

12 and 20, a supply path 2711 is formed in the inner direction in the longitudinal direction of the inner rod 270, and a connecting member rotatably connected to the lower part by a second swivel portion 275 ( 277). The second swivel portion 275 that rotatably connects the connecting member 277 has an inner diameter portion 2721 formed stepwise on the inner surface of the inner rod 270, as illustrated in FIGS. 14 and 20, for example. And an outer diameter portion 2776 formed stepwise in a shape corresponding to the inner diameter portion 2721 on the upper outer surface of the connecting member 277, and between the inner diameter portion 2721 and the outer diameter portion 2776. It may be composed of one or more O-rings (2751) provided, the bearing (b) between the inner diameter portion 2721 and the outer diameter portion (2776) in order to more secure the rotational support of the connecting member (277) for the inner rod (270) It is also possible to further provide 2753.

The coupling member 277 may be configured to rotate integrally with the rod casing 250 by a method of coupling the outer surface of the coupling member 277 to the inner surface of the rod casing 250.

As shown in FIGS. 14 and 20, the connecting member 277 is a hollow body, and the supply path 2711 extends through the connecting member 277 in the longitudinal direction of the rod casing 250, and the supply path ( The injection hole 2773 communicating with 2711 is formed in the connection member 277. 14 and 20, through holes 2533 are formed in the length direction of the rod casing 250. The lower portion of the drill portion 253 is provided with a plurality of drill bits (2531) having a high hardness for drilling work. Expansion grouting apparatus 200 according to the present invention is one end is connected to the supply path (2711) to the lower end of the connecting member 277, the other end of the hollow connected to the through hole (2533) of the drill portion 253 It further includes a second guide tube (287). As shown in FIGS. 14 and 20, a gap is formed between the connection member 277 and the inner lower end of the road casing 250.

As shown in FIG. 12, a swivel portion 240 is provided at an upper portion of the inner rod 270 so that the supply pipe 221 is connected to the swivel main body 241. An upper portion of the inner rod 270 is provided with an injection hole (not shown) communicating with the supply pipe 221 and the supply path 2711 and formed in a radial direction.

As shown in FIG. 12, the first driver 230 is a hollow body casing 231 which is installed to be movable in the longitudinal direction along the supporting member 213 like the driver 130 of the related art, and the casing. A driven gear 233 rotatably installed inwardly of 231, a drive gear 235 rotatably installed inwardly of the casing 231, and engaged with the driven gear 233, and the drive gear; A first motor 237 that drives 235. The rod casing 250 penetrates through the casing 231 and is inserted into a driven gear 233 installed inwardly of the casing 231 to rotate integrally with the driven gear 233. The road casing 250 rotatably penetrates the casing 231.

The second driver 260 rotates inwardly of the casing 261 and the casing 261 which is a hollow body which is installed to be movable in the longitudinal direction along the support member 213 like the driver 130 of the related art. A driven gear 263 which is installed to be capable of being installed, a drive gear 265 which is rotatably installed in the casing 261 and meshes with the driven gear 263, and which drives the drive gear 265. Two motors 267. The inner rod 270 penetrates through the casing 261 and is inserted into a driven gear 263 installed inside the casing 261 to rotate integrally with the driven gear 263. A key or the like may be inserted between the inner rod 270 and the driven gear 263 to rotate integrally, but as shown in FIGS. 12 and 15, the inner rod 270 into which the driven gear 263 is inserted. The cross section of the part 3) may be formed in a polygon, and the inner surface of the driven gear 263 may also be formed in a polygon. The inner rod 270 rotatably penetrates the casing 261.

The first motor 237 provided to the first driver 230 and the second motor 267 provided to the second driver 260 may be hydraulic motors.

The extension drill unit 280 is connected to the rod casing 250 and the inner rod 270, one or more lengths in the radial direction of the rod casing 250 increases or decreases and having a drill bit 2811 Extension rod 281. As shown in FIGS. 13, 14, and 20, the extension drill part 280 may include one or more extension rods 281 rotatably connected to a hinge 289 installed at a lower inner side of the hollow rod casing 250. ) And one end is rotatably connected to the connecting member 277, and the other end includes a connecting rod 283 rotatably connected to the extension rod 281. Preferably, the extension rod 281 is provided with a plurality of connection rods, and the connection rod 283 is rotatably connected to each expansion rod 281 so that the connection rod 283 is also provided with a plurality of extension rods 283. The extension rod 281 is provided with a plurality of drill bits 2811. 14 and 20 illustrate that the drill bit 2811 is provided on either side, but the drill bit 2811 may be provided on the opposite side.

The extension drill part 280 is moved through the long hole 255 while the connection member 277 moves toward the lower end of the rod casing 250 while the extension rod 281 rotates about the hinge 289. The portion exposed to the outside of the rod casing 250 increases to increase the radial distance from the hinge 289 to the end of the extension rod 281, and the connecting member 277 from the lower end of the rod casing 250. When the extension rod 281 rotates around the hinge 289, the portion exposed to the outside of the road casing 250 through the long hole 255 is reduced, the extension rod 281 from the hinge 289 The radial distance to the end of is reduced.

On the other hand, the expansion drill portion 280 is one or more extension rods rotatably connected to the hinge installed in the connecting member 277 hollow, one end is rotatably connected to the lower inner side of the hollow rod casing 250 And the other end may be made of a connecting rod 283 rotatably connected to the expansion rod.

The expansion grouting apparatus 200 according to the present invention has one end connected to the injection hole 2773 and extending along the longitudinal direction of the expansion rod 281 as shown in FIGS. 13, 14, and 20. It further comprises a hollow first guide tube 288 fixed to 281 and having one or more nozzles 2851. In FIG. 13, FIG. 14 and FIG. 20, reference numeral 286 illustrates fixing means for fixing the first guide tube 288 to the extension rod 281. As shown in FIG. 19, the nozzle 2851 is preferably installed to have a spraying direction in which the reinforcing material sprayed through the nozzle 2851 is sprayed evenly.

The first guide tube 288 may be connected to the middle portion of the extension tube portion 285 which is a portion fixed to the extension rod 281, one end of the extension tube portion 285 as shown by a dotted line in FIG. May be connected.

The first guide tube 288 is preferably fixed to the expansion rod 281 in the direction opposite to the rotation direction of the rod casing 250, a recess (not shown) in the expansion rod 281 to prevent damage It is also possible to install) and install it so that a part of it is seated in the groove.

12 and 20, when the inner casing 270 is rotated by driving the second driver 260 while the rod casing 250 is not rotated, the inner rod 270 is engaged by the screw portion 290. Is moved in the longitudinal direction of the road casing 250, the extension rod 281 is rotated about the hinge while the portion exposed to the outside of the road casing 250 through the long hole 255 increases the hinge Radial distance from the end of the extension rod 281 to the end of the extension rod 281 increases, or the portion exposed to the outside of the road casing 250 through the long hole 255 is reduced to reduce the radius from the hinge to the end of the extension rod 281 The direction distance is reduced. The expansion of the expansion unit 280 may be controlled by varying the rotation speed of the first motor 237 and the rotation speed of the second motor 267.

Meanwhile, as shown in FIG. 14, the expansion grouting apparatus 200 according to the present invention includes a support member 213 and a support member along the support member 213. The first driver 230 is provided to be movable in the longitudinal direction of the 213, and is connected to the first driver 230 to be rotated by the first driver 230, the first driver ( A hollow rod casing 250 moving in the longitudinal direction of the supporting member 213 along with the first pressing means (not shown) for moving the rod casing 250 along the supporting member 213; An inner rod 270 slidably inserted into the rod casing 250 in the longitudinal direction of the rod casing 250, and an agent for moving the inner rod 270 in the longitudinal direction of the rod casing 250; 2 pressurization means (not shown) and the road casing 250 A drill part 253 which is provided at the front end and rotates integrally with the rod casing 250 and includes a drill bit 2253, and an extension drill part connected to the inner rod 270 and the rod casing 250. 280). In this case, a second driver for rotating the inner rod 270 is not necessary.

As shown in FIG. 14, the inner rod 270 is slidably inserted into the inside of the rod casing 250, and a portion of the upper portion is exposed from the rod casing 250 and the second pressing means is exposed to the exposed portion. Connected. The first and second pressurizing means may be configured by a cylinder or a winch, which is a pressurizing means according to the prior art, and description thereof will be omitted.

The inner rod 270 may be configured to be rotatable with respect to the rod casing 250, and has a connecting member 277 connected to the second swivel portion 275 at a lower portion thereof. In this case, the connection member 277 may be configured to rotate integrally with the rod casing 250. In the above structure, the upper portion of the inner rod 270 may not include the swivel portion 240 (see FIG. 12), and the supply pipe 221 may be directly connected to the injection hole provided in the upper portion of the inner rod 270. It is possible to do

On the other hand, the inner rod 270 may be configured to rotate integrally with the road casing 250, in which case the upper portion should be provided with a swivel portion 240, as shown in Figure 12, the lower second It is not necessary to include a connecting member 277 connected to the swivel portion 275, and the second guide tube 287 is connected to the supply path 2711 under the inner rod 270. In FIG. 14 and FIG. 20, reference numeral 2775 denotes a seating portion, which is a curved jaw formed at the lower portion of the injection hole 2773, and communicates with the second guide tube 287 by placing a blocking member on the seating portion 275. It is possible to block the part of the supply passage (2711).

The sensor is installed between the inner rod 270 and the rod casing 250 to sense the relative position of the inner rod 270 and the rod casing 250, and thus the radius from the hinge to the end of the extension rod 281. The direction distance can be calculated.

In FIGS. 14 and 20, a valve operating by pressure is installed in the injection hole 2773 to block the injection hole 2773 when a low pressure punched water is supplied, and block the seating portion 275 by a blocking member. And when the high-pressure reinforcement is supplied can be to be injected through the injection hole (2773).

Other configurations are the same as those described above, so a description thereof will be omitted.

Hereinafter, the ground strength reinforcement construction method using the expansion grouting apparatus 200 according to the present invention shown in FIGS. 12 to 16 and 20 will be described with reference to FIGS. 17 to 19.

After supporting and installing the main body with a supporting part (not shown), the index S is applied to the first pressing means in a state in which the radial distance from the hinge of the expansion part 280 to the end of the expansion rod 281 is reduced. While pressing the road casing 250 in a direction away from the first driver 230, the perforations H are formed in the ground G as shown in FIG. 17A (ST-110). . When the second driver 260 is provided, the second motor 267 of the second driver 260 is in a free rotation state, or the rotation speeds of the first motor 237 and the second motor 267 are the same. . At this time, the drilled portion (H) can be formed while supplying the punched water to the supply path (2711) while ejecting the punched water through the ejection hole (2535) of the drill portion 253 via the second guide pipe (287). have.

When the starting depth at which the reinforcement is to be formed is reached, the radial distance from the hinge of the extension 280 to the end of the extension rod 281 is increased as indicated by the arrow in Fig. 17B (ST-120). ). At this time, the operation of the first pressing means can be stopped to increase the radial distance from the hinge to the end of the extension rod 281 at the depth of arrival, while continuing the drilling and from the hinge to the end of the extension rod 281. You can also increase the distance.

When the second driver 260 is provided, the connecting member 277 is loaded by controlling the first driver 230 and the second driver 260 to have different rotation speeds of the inner rod 270 and the rod casing 250. Move toward the bottom of the casing 250 to increase the radial distance from the hinge to the end of the extension rod 281.

In addition, when the second driver 260 is not provided, the inner rod 270 is pressed by the second pressing means to move the connecting member 277 toward the lower end of the rod casing 250 so that the extension rod 281 is removed from the hinge. Increase radial distance to tip. In this case, when the connection member 277 is not provided, the inner rod 270 is moved toward the lower end of the rod casing 250 to increase the radial distance from the hinge to the end of the extension rod 281. At this time, the expansion unit 280 is preferably maintained to rotate.

When the step ST-120 of increasing the radial distance from the hinge of the expansion unit 280 to the end of the expansion rod 281 is completed, the rod casing 250 in a direction away from the surface S by the first pressing means. ) Is pressed and the rod casing 250 is rotated by the first driver 230 to advance to the depth of the reinforcement portion (ST-130, FIG. 17 (b)). In this case, when the second driver 260 is provided, the second motor 267 of the second driver 260 is in a free rotation state, or the rotation speeds of the first motor 237 and the second motor 267 are the same. do. When the second driver 260 is not provided, the inner rod 270 is pressed in the direction away from the surface S by the second pressing means so that the rod casing 250 and the inner rod 270 proceed at the same speed. do.

When it proceeds to the depth of the reinforcing part formation (ST-130), the supply of the punched water is stopped and the reinforcing material is supplied to the supply path 2711 of the inner rod 270 to supply the supply path 2711 and the injection hole 2773. 1 While the reinforcing material is injected through the nozzle 2851 via the guide pipe 288, the first and second pressurizing means pressurizes and rotates the rod casing 250 in the direction toward the surface S (ST-140, FIG. 17). (c)). 14 and 20, a blocking member may be inserted into the seating portion 2475 to block a passage to the second guide tube 287. In this case, when the second driver 260 is provided, the second motor 267 of the second driver 260 is in a free rotation state, or the rotation speeds of the first motor 237 and the second motor 267 are the same. do. When the second driver 260 is not provided, the inner rod 270 is pressed in the direction toward the indicator S by the second pressing means so that the moving speeds of the inner rod 270 and the road casing 250 are the same. I can keep it.

  In step ST-140, when the start depth of reinforcement formation is reached (Fig. 17 (c)), the reinforcement supply is stopped and the radial distance from the hinge of the extension 280 to the end of the extension rod 281 is reached. Reduce (ST-150). As shown in FIG. 17D, the inner rod 270 and the rod casing 250 are slightly lowered again in consideration of the rotation radius of the extension rod 281, and then the extension rod (from the hinge of the extension portion 280) The radial distance to the end of 281 can be reduced.

When the second driver 260 is provided, the connecting member 277 is loaded by controlling the first driver 230 and the second driver 260 to have different rotation speeds of the inner rod 270 and the rod casing 250. Moving away from the lower end of the casing 250 reduces the radial distance from the hinge to the end of the extension rod 281.

In addition, when the second driver 260 is not provided, the inner rod 270 is pressed by the second pressing means to move the connecting member 277 in a direction away from the lower end of the rod casing 250 to extend the extension rod 281 from the hinge. Decrease the radial distance to the end of In this case, when the connecting member 277 is not provided, the inner rod 270 is moved away from the lower end of the rod casing 250 to reduce the radial distance from the hinge to the end of the extension rod 281. At this time, the expansion unit 280 is preferably maintained to rotate.

When the step ST-150 of reducing the radial distance from the hinge of the extension portion 280 to the end of the extension rod 281 is completed, the road casing 250 and the inner rod 270 of the ground (G) Withdrawal from the punching part (ST-160) to complete the reinforcement input operation, and when the injected reinforcement solidifies, it is formed as a reinforcement.

Another construction method according to the present invention will be described. After the main body is supported and installed by a supporting portion (not shown), the radial distance from the hinge of the expansion portion 280 to the end of the expansion rod 281 is determined. While pressing the load casing 250 in a direction away from the surface S with the first pressing means, the first driver 230 is driven to the ground G as shown in FIG. 18 (a). A perforation portion H is formed (ST-110).

When the second driver 260 is provided, the second motor 267 of the second driver 260 is in a free rotation state, or the rotation speeds of the first motor 237 and the second motor 267 are the same. . At this time, supplying the punched water to the supply path (2711) to form the punched portion (H) while ejecting the punched water through the jet hole (2535) of the drill portion 253 via the second guide pipe (287). desirable.

When reaching the bottom dead center where the reinforcing portion should be formed, as shown in FIG. 18B, the radial distance from the hinge of the expansion portion 280 to the end of the expansion rod 281 is increased (ST-120).

When the second driver 260 is provided, the connecting member 277 is loaded by controlling the first driver 230 and the second driver 260 to have different rotation speeds of the inner rod 270 and the rod casing 250. Moving toward the lower end of the casing 250 increases the radial distance from the hinge to the end of the extension rod 281 (Fig. 18 (b)).

In addition, when the second driver 260 is not provided, the inner rod 270 is pressed by the second pressing means to move the connecting member 277 toward the lower end of the rod casing 250 so that the extension rod 281 is removed from the hinge. Increase radial distance to tip. In this case, when the connection member 277 is not provided, the inner rod 270 is moved toward the lower end of the rod casing 250 to increase the radial distance from the hinge to the end of the extension rod 281. At this time, the expansion unit 280 is preferably maintained to rotate.

When the step ST-120 of increasing the radial distance from the hinge of the expansion unit 280 to the end of the expansion rod 281 is completed (Fig. 18 (c)), the supply of the punched water is stopped, and the inner rod The first pressurization is supplied by supplying the reinforcing material to the supply path 2711 of the 270, and spraying the reinforcing material through the nozzle 2851 via the supply path 2711, the injection hole 2773, and the first guide tube 288. By means of pressurizing and rotating the rod casing 250 in the direction toward the indicator S (ST-135, Fig. 18 (d)). 14 and 20, a blocking member may be inserted into the seating portion 2475 to block a passage to the second guide tube 287.

In this case, when the second driver 260 is provided, the second motor 267 of the second driver 260 is in a free rotation state, or the rotation speeds of the first motor 237 and the second motor 267 are the same. do. When the second driver 260 is not provided, the inner rod 270 is pressed in the direction toward the indicator S by the second pressing means so that the moving speeds of the inner rod 270 and the road casing 250 are the same. I can keep it.

  In step ST-135, when the start depth of reinforcement formation is reached (Fig. 18 (e)), the supply of the reinforcement is stopped and the radial distance from the hinge of the extension 280 to the end of the extension rod 281 is reached. Reduce (ST-150). As shown in FIG. 18E, the inner rod 270 and the rod casing 250 are slightly lowered in consideration of the radius of rotation of the extension rod 281, and then the extension rod (from the hinge of the extension portion 280). The radial distance to the end of 281 can be reduced.

When the second driver 260 is provided, the connecting member 277 is loaded by controlling the first driver 230 and the second driver 260 to have different rotation speeds of the inner rod 270 and the rod casing 250. Moving away from the lower end of the casing 250 reduces the radial distance from the hinge to the end of the extension rod 281.

In addition, when the second driver 260 is not provided, the inner rod 270 is pressed by the second pressing means to move the connecting member 277 in a direction away from the lower end of the rod casing 250 to extend the extension rod 281 from the hinge. Decrease the radial distance to the end of In this case, when the connecting member 277 is not provided, the inner rod 270 is moved away from the lower end of the rod casing 250 to reduce the radial distance from the hinge to the end of the extension rod 281. At this time, the expansion unit 280 is preferably maintained to rotate.

When the step ST-150 of reducing the radial distance from the hinge of the extension portion 280 to the end of the extension rod 281 is completed, the road casing 250 and the inner rod 270 of the ground (G) Withdrawal from the punching part (ST-160) to complete the reinforcement input operation, and when the injected reinforcement solidifies, it is formed as a reinforcement.

Although the exemplary embodiments of the present invention have been described above by way of example, the scope of the present invention is not limited to such specific embodiments, and the scope obvious to those skilled in the art to which the present invention pertains is described within the claims of the present invention. It should be interpreted as belonging to a category.

1 is a schematic side view showing a grouting device according to the prior art.

2 to 5 illustrate a process of reinforcing ground strength using a grouting device according to the prior art.

6 and 7 are longitudinal cross-sectional views showing a rod provided in the grouting apparatus according to the prior art.

8 is a cross-sectional view showing a normal reinforcement.

9 is a cross-sectional view for illustrating a failure example of the reinforcement part.

10 is a view for explaining the operation of the grouting device according to the prior art.

11 is a diagram illustrating an example of a swivel means provided in the grouting apparatus according to the prior art.

Figure 12 is a schematic illustration for explaining the expansion grouting apparatus according to the present invention.

FIG. 13 is shown in the lateral direction of FIG. 12.

14 is a partial cross-sectional view schematically illustrating the expansion grouting apparatus according to the present invention.

15 is a cross-sectional view of the inner rod taken along the line A-A of FIG.

FIG. 16 is a cross-sectional view taken along the line A-A of FIG. 14.

17 and 18 illustrate the ground strength reinforcement construction method using the expansion grouting apparatus according to the present invention.

FIG. 19 is an enlarged view of a portion A of FIG. 18.

20 shows another example of the expansion grouting apparatus according to the present invention.

Claims (9)

A first driver 230 guided by the support member 213 of the main body installed on the ground and provided to be movable along the support member 213; A hollow road casing 250 connected to the first driver 230 and driven to rotate by the first driver 230 and moving along the support member 213 together with the first driver 230; First pressing means for moving the rod casing 250 along the support member 213; A second driver 260 guided by the support member 213 and provided to be movable along the support member 213; Inserted into the inside of the road casing 250 is engaged by the screw portion 290, a part of the road casing 250 is exposed in the longitudinal direction and the exposed portion is connected to the second driver 260 to the second It is rotated by the driver 260, and has a connecting member 277 rotatably connected by a second swivel portion 275, a supply path (2711) is formed in the longitudinal direction, the supply in the radial direction A hollow inner rod 270 having one or more injection holes 2773 communicating with the furnace 2711; A radial length of the rod casing 250 increases or decreases and is composed of one or more extension rods 281 having a drill bit 2811 and connected to the inner rod 270 and the rod casing 250. Expansion drill unit 280 is installed; Extended grouting apparatus (200), characterized in that it comprises a drill portion (253) which is provided at the front end of the rod casing (250) integrally rotates with the load casing (250) and has a drill bit (2531). A first driver 230 guided by the support member 213 of the main body installed on the ground and provided to be movable along the support member 213; A hollow road casing 250 connected to the first driver 230 and driven to rotate by the first driver 230 and moving along the support member 213 together with the first driver 230; First pressing means for moving the rod casing 250 along the support member 213; Second pressing means for moving the inner rod 270 in the longitudinal direction of the rod casing 250; A connection rotatably inserted into the rod casing 250 and movably inserted in the longitudinal direction of the rod casing 250, connected to the second pressing means, and rotatably connected by the second swivel portion 275. A hollow inner rod 270 having a member 277 and having a supply path 2711 formed in a longitudinal direction and at least one injection hole 2773 communicating with the supply path 2711 in a radial direction; A radial length of the rod casing 250 increases or decreases and is composed of one or more extension rods 281 having a drill bit 2811 and connected to the inner rod 270 and the rod casing 250. Expansion drill unit 280 is installed; Extended grouting device (200), characterized in that it comprises a drill portion 253 which is provided at the front end of the rod casing (250) integrally rotates with the load casing (250) and has a bit (2531). A hollow rod casing 250 having a drill portion 253, a hollow inner rod 270 provided inside the rod casing 250, and connected to the rod casing 250 and an inner rod 270. And expansion grouting apparatus 200, characterized in that it comprises an expansion drill portion 280 extending in the radial direction of the rod casing (250). 3. The rod casing (250) according to claim 1 or 2, wherein at least one long hole (255) is formed in the length of the road casing (250); One end of the extension rod 281 is rotatably installed on the rod casing 250 by a hinge 289, the end of the extension drill portion 280 is rotatably connected to the connecting member 277 and the other end Further comprises a connection rod 283 rotatably connected to the extension rod 281; When the connecting member 277 moves toward the lower end of the rod casing 250, the extension rod 281 rotates about the hinge 289 and moves to the outside of the rod casing 250 through the long hole 255. As the exposed portion increases, the radial distance from the hinge 289 to the end of the extension rod 281 increases, and the extension member 277 moves away from the lower end of the rod casing 250. Rotation about the hinge 289 decreases the portion exposed to the outside of the road casing 250 through the long hole 255 to reduce the radial distance from the hinge 289 to the end of the extension rod 281 Extended grouting apparatus 200, characterized in that. 3. The rod casing (250) according to claim 1 or 2, wherein at least one long hole (255) is formed in the length of the road casing (250); One end of the extension rod 281 is rotatably installed to the connecting member 277 by a hinge, the extension drill portion 280 is one end is rotatably connected to the rod casing 250 and the other end is A connection rod 283 rotatably connected to the extension rod 281; When the connecting member 277 moves toward the lower end of the rod casing 250, the extension rod 281 rotates about the hinge and is exposed to the outside of the rod casing 250 through the long hole 255. This increase increases the radial distance from the hinge to the end of the extension rod 281, and the extension rod 281 rotates about the hinge when the connecting member 277 moves away from the lower end of the rod casing 250. While the portion exposed to the outside of the road casing 250 through the long hole 255 is reduced, the radial grouting device from the hinge 289 to the end of the extension rod 281 is reduced ( 200). According to claim 1 or claim 2, wherein the connection member 277 is a hollow body, the supply passage (2711) is formed extending through the connection member 277 in the longitudinal direction of the rod casing 250, the supply passage ( The injection hole (2773) communicated with the 2711 is formed in the connecting member (277), the drill portion 253 is formed with a through hole (2533) in the longitudinal direction of the rod casing (250); One end is connected to the supply path (2711) to the lower end of the connecting member 277, the other end is connected to the through hole 2533 of the drill portion 253 and the second guide pipe (287) It further comprises a first guide tube 288 connected to the hole 2773, extending along the longitudinal direction of the expansion rod 281 and fixed to the expansion rod 281 and having one or more nozzles 2851. Expansion grouting device 200. In the construction method of reinforcing the strength of the ground by using the expansion grouting apparatus 200 according to claim 6, driving the first driver 230 while rotating the road casing 250, the road casing 250 Pressing in a direction away from the surface (S) to form a perforation (H) in the ground (G) (ST-110); Moving the connecting member 277 toward the lower end of the rod casing 250 to increase the radial distance from the hinge to the end of the extension rod 281 (ST-120); Increasing the radial distance from the hinge to the end of the extension rod 281 and then rotating the inner rod 270 under pressure (ST-130); Rotating the inner rod 270 while supplying a reinforcing material through the supply path 2711 and spraying it through the nozzle 2851 while pressing in the direction toward the indicator S (ST-140); Moving the connecting member 277 in a direction away from the lower end of the rod casing 250 to reduce the radial distance from the hinge to the end of the extension rod 281 (ST-150); Ground strength reinforcement construction using an extended grouting device comprising the step of taking out the rod casing 250 and the inner rod 270 from the boring portion H of the ground G (ST-160) Way. In the construction method of reinforcing the strength of the ground by using the expansion grouting apparatus 200 according to claim 6, driving the first driver 230 while rotating the load casing 250 to rotate the load casing 250 Pressing in a direction away from the surface (S) to form a perforation (H) in the ground (G) (ST-110); Moving the connecting member 277 toward the lower end of the rod casing 250 to increase the radial distance from the hinge to the end of the extension rod 281 (ST-120); After increasing the radial distance from the hinge to the end of the extension rod 281, press the inner rod 270 toward the surface (S) and supply the reinforcement through the supply path (2711) through the nozzle (285) Rotating in the spraying state (ST-135); Moving the connecting member 277 in the direction away from the lower end of the rod casing 250 to reduce the radial distance to the end of the extension rod 281 (ST-150); Ground strength reinforcement construction using an extended grouting device comprising the step of taking out the rod casing 250 and the inner rod 270 from the boring portion H of the ground G (ST-160) Way. According to claim 7 or 8, While driving the first driver 230 to rotate the load casing 250 while pressing the load casing 250 in a direction away from the surface (S) to the ground (G) In the forming of the drilling portion H (ST-110), the drilling water is injected into the supply path 2711 and sprayed to the tip of the drill portion 253 through the through hole 2533 formed in the drill portion 253. Ground strength reinforcement construction method using the expansion grouting device, characterized in that forming a punched portion (H).

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