JP2666239B2 - Drilling root consolidation liquid injection method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for injecting an excavated consolidation liquid for embedding a ready-made pile into a drilled hole excavated in the ground, and more particularly, to a pneumatic impact drilling drill operated by compressed air. The present invention relates to a method and an apparatus for injecting an excavating root consolidation liquid capable of continuously injecting a consolidation liquid without taking out the excavating drill to the ground surface once after excavation is performed. It is used in the field of foundation pile construction, etc., in which ready-made piles are installed with low noise and low vibration on the ground with rocks and rock layers.

[0002]

2. Description of the Related Art Conventionally, piles that have been driven by hitting have been excavated by drilling a hole approximately equal to the volume of the pile in order to install the pile with low noise and low vibration. I have. In this method, the pile supporting ground is roughened and the pile supporting ground is roughened, but the pile supporting capacity is weakened. However, a solidifying liquid (such as cement milk) is injected for the purpose of improving the pile supporting ground. Here, a pneumatic impact drilling drill (Japanese Patent Publication No. 55-25265, Japanese Patent Publication No. 57-35356, Japanese Patent Publication No. 58-58), which exerts power even in excavation of rock or the like by using the impact motion by compressed air operation. No. 5354), which are called by names such as a down-the-hole hammer and a super drill (Japanese Patent Publication No. 63-52197). For example, in a down-the-hole hammer drill, compressed air is sent to an air inlet 15 by an air compressor (not shown) as shown in FIG. 18, and a reciprocating motion of a piston 16 is transmitted to a button bit (commonly called a head) 11. Transmit and pierce with the impact force of the button bit.

[0003]

However, although the above-mentioned drill is excellent in excavation of a bedrock or the like, a work for excavating and forming a building hole in the ground, then laying a ready-made concrete pile or the like and embedding a foundation pile. When used as an apparatus, there is a drawback that the consolidation liquid cannot be injected unless the entire drilling drill is once taken out to the ground, and it takes too many steps. If the drill was raised quickly to improve this, the hole walls would collapse, causing the piles to stay high. On the other hand, a method of switching and injecting the consolidation liquid from the air into the air inlet 15 through which the compressed air flows is used. In order to shorten the construction period, the consolidation liquid stays inside the drilling drill having a complicated mechanism. Function was lost.

The present invention has been made to overcome the above-mentioned problems. After drilling a ground with a drill, a rooting liquid is placed on the drilling bottom at the same time when the device is pulled out.
An object of the present invention is to provide an excavation root consolidation liquid injection method and an apparatus for shortening the construction period.

[0005]

According to a first aspect of the present invention, there is provided a drilling root consolidation liquid injection method in which a cylindrical valve box having a bottom and a valve body are slid in a cylinder above the pneumatic impact drilling drill. And a valve body that can be moved up and down by arranging a part, and penetrates a flow path into the valve body,
By the up and down movement of the valve element, the outlet of the flow path, the air hole communicating from the inner wall of the valve box to the air inlet of the drilling drill, and the root consolidation liquid hole penetrating from the inner wall of the valve box to the outer wall of the cylinder Using a drilling root consolidation liquid injection device equipped with a switching valve that can be switched to any one, connect the outlet of the flow path with an air hole,
The compressed air is supplied to the flow path to excavate to a predetermined depth of the ground with a drill, and then the supply of the compressed air is stopped and the outlet of the flow path is switched so as to communicate with the consolidation liquid hole. The method is characterized in that the root compaction liquid is poured into the channel and the root compaction liquid is injected into the shaved bottom while raising the excavation root compaction liquid injection device.

[0006] Here, the "cylinder inner wall" includes not only the inner surface of the cylindrical portion relating to the bottomed cylindrical valve box but also the inner surface of the bottom.
The term “cylinder outer wall” includes not only the outer surface of the cylindrical portion of the bottomed cylindrical valve box but also the outer surface of the bottom. In the “air hole leading to the air inlet of the drilling drill”, the air inlet and the air hole need not be directly joined, but may be configured to communicate with each other. In "switching to stop the supply of compressed air and connect the outlet of the flow path to the consolidation liquid hole", stop the supply of compressed air, and then connect the outlet of the flow path to the consolidation liquid hole. In addition to the switching operation, the reverse procedure is included. Further, such two operations may be performed simultaneously.

[0007] The drilling root consolidation liquid injection device according to the second invention comprises a pneumatic impact drilling drill (1) operated by compressed air, a bottomed cylindrical valve box (21) above the drilling drill, and A valve body (22) having a sliding portion in the cylinder of the valve box and capable of moving up and down, wherein the valve box has an air hole (211) leading from the inner wall of the cylinder to an air inlet of a drilling drill; A switching valve (2) having a rooting liquid hole (212) penetrating from the cylinder inner wall to the cylinder outer wall separately from the cylinder inner wall, and a flow path (222) penetrating through the valve body in the valve body. And, by joining the outlet of the flow path according to the valve body to the air hole,
The compressed air is fed into the flow passage so that the drilling drill can perform excavation, while the valve body is moved to join the outlet of the flow passage to the root consolidation liquid hole, so that the root is inserted into the flow passage. The method is characterized in that the consolidation liquid is poured and the consolidation liquid is injected into the shaved bottom via the consolidation liquid hole. Excavation of the third invention
The liquid injection device is a pneumatic impact type drilling
Lil (1) and drilling drill covered from above the drilling drill
Into a tubular shape that covers the casing and inside the tubular shape
A shell base (3) in which a conduit is arranged, and
Installed on the top of the drill, to the air inlet of the drill
Forming an air hole that communicates with a root consolidation liquid hole that communicates with the conduit
And a switching valve switchable to the air inlet or conduit.
(2) .

[0008]

According to the method and the apparatus for injecting a drilling root consolidation liquid of the present invention, in the step of excavating the ground, the outlet of the flow passage is communicated with the air inlet toward the inside of the drilling drill body to compress the flow into the flow passage. When air is supplied, the drill operates. The rock layer and the like can be drilled by the impact force of the button bit by the reciprocating motion of the piston. Also, after drilling the ground to a predetermined depth, when pulling up the drilling drill, connect the outlet of the flow channel with the consolidation liquid hole and slowly raise the drill while pouring the consolidation liquid such as cement milk into the flow channel. As a result, it is possible to inject the rooting liquid, which is a material for generating a supporting force, into the shaved bottom at the tip of the pile without passing the rooting liquid through the drilling drill.

[0009]

The present invention will be described below in detail with reference to examples. (1) Embodiment 1 Configuration of Drilling Root Consolidation Liquid Injection Apparatus FIGS. 1 to 10 show one embodiment of a digging root consolidation liquid injection apparatus according to the present invention.
, Shell base 3, vibration absorber 4, protective cover 5
And

The drill 1 is a well-known drill that utilizes compressed air. By sending compressed air from an air compressor (not shown), the piston located directly above the button bit 11 is reciprocated, and the drill is hit. Energy is transmitted to the button bit 11 to pierce with the impact force of the button bit (FIG. 1). The internal mechanism is the same as that shown in FIG. Reference numeral 12 denotes a casing, and reference numeral 14 denotes a hexagonal column-shaped nozzle having an air inlet 15. The nozzle 14 is notched with a pin groove 141.

The switching valve 2 comprises a valve box 21 and a valve element 22. The valve box 21 has a bottomed cylindrical shape, and the center of the cylinder is substantially “10” in cross section.
It has a cylindrical hole 21b cut in the shape of a letter to the vicinity of the bottom 21a (FIGS. 2 and 5). The valve box 21 has a cylinder inner wall 2 near the bottom of the cylinder hole.
An air hole 211 having a circular cross section is formed from No. 15 to the center of the rear surface of the bottom 21a through the thick portion on the side surface of the valve box (FIG. 2). The outlet of this air hole 211 is
To the air inlet 15. The cylinder inner wall 215 facing the entrance 2111 of the air hole 211 has a cylinder inner wall 215.
Root fixing liquid hole 21 having a circular cross section penetrating through the outer wall 218 from the cylinder
2 are formed (FIG. 2). The inlet 2121 of the root consolidation liquid hole 212 in the cylinder inner wall 215 is located above the position of the inlet 2111 of the air hole 211. The root compaction liquid hole 212 is inclined downward toward the outer cylinder wall 218. This is to make the root compaction liquid easily flow downward.

A pin hole 21 is formed near the upper side of the valve box 21 to form a cutout groove 2151 in the cylinder inner wall 215 across the valve box 21.
3, 213 are formed (FIGS. 2 and 5). FIG. 2 and FIG.
Valve box 21 with female joint 219 not yet mounted
2 shows a main body portion. A female joint 219 fitted to the nozzle 14 is fixed to the lower part of the main body by welding (FIG. 1). The female joint 219 is formed with a through-hole extending vertically from the center of the upper surface to the bottom surface on the axis. The female joint 219 has a hexagonal hole for fitting on the bottom side. The nozzle 14 and the female joint 219 are fitted, and the pin 219
By inserting 1,191 into the pin holes 2192 and the pin grooves 141, the drilling drill 1 and the valve box 21 are integrated (FIG. 8). The pin 2191 fixes the nozzle 14 and the female joint 219 with an elastic spring held by the pin itself, and also prevents the pin 2191 from falling off by the wire 2193. A flange 214 is fixed to the outer peripheral wall of the female joint 219 (FIG. 1). Reference numeral 216 denotes a cylindrical hole 21b.
A drain reservoir 217 is provided at the bottom of the container, and reference numeral 217 denotes a drain discharge hole. Also for pressure relief. The upper end of the valve box 21 forms an inclined surface 21c. Even if soil removal etc. is placed in such a place,
This is to make it slide down.

The valve body 22 is fitted into the cylindrical hole 21b of the valve box 21, and is slidable. A slidable portion 221 is provided. And a male joint 224 welded and fixed to the upper surface of the portion 223 (FIGS. 1 and 3). The valve 22 has a flow path 2 having a circular cross section penetrating from the upper surface of the male joint 224 to the side of the sliding portion of the valve 22.
22 are formed. The flow path 222 has a substantially inverted “T” shape in vertical cross section, and two outflow ports 2221 and 2222 of the flow path 222 are provided on the side surface of the sliding portion. Channel 2
As shown in FIG. 3, the outlet portion 22 has a configuration inclined downward to the right from the outlet 2221 to the outlet 2222. This is for facilitating the flow of the root compaction liquid.

In the vicinity of the outlet 2221, a large hole is cut out to form a step 2223 (FIG. 6). An elastic body 2224 is arranged in the step 2223, and a seal ring 2225 is fitted thereon. When the outlet 2221 of the flow path 222 is joined to the air hole 211, the seal ring 2225 is urged by the elastic body 2224 to seal. Here, the elastic body 2224 uses a foamed urethane resin, but other foamed synthetic resins, synthetic rubbers, synthetic resins, springs, and the like can be used.

The sliding portion 221 has a rectangular column shape having a substantially "10" cross section as shown in FIG. Bay portions 225 and 225 having a constant width are formed near the center of the sliding portion 221. When the sliding portion 221 is housed in the cylindrical hole 21b of the valve box 21 and the sliding portion 221 descends to the bottom of the cylindrical hole due to its gravity,
The outlet 2221 of the flow path 222 is connected to the inlet 2 of the air hole 211.
111 (FIG. 2). When the pin 6 is inserted into the pin hole 213 in such a state, the pin 6 passes through the recess 225 and the valve box 21 and the valve body 22 are integrated. The pin 6 has the same shape as the pin 2191. Thus, the valve body 22 can move up and down with respect to the valve box 21 only in the range of the cutout portion of the bay recess 225. This is because the pin 6 locks the valve body 22 to restrict the movement. When the valve element 22 at the lowermost position is pulled up to the uppermost position where the valve element 22 is locked by the pin 6, the outflow port 2222 is joined to the inlet 2121 of the consolidation liquid hole 212. (FIG. 3).

The flange portion 223 has a disc shape at the upper end of the sliding portion 221 so as to protrude more than the sliding portion 221 (FIG. 4). The upper surface of the flange 223 forms a recess 2231, and the male joint 224 is fixed to the recess 2231 by welding (FIGS. 1 and 2). 2 to 4 show the valve body 22 before the male joint 224 is fixed by welding. The male joint 224 has a hexagonal shape, and is configured to fit into a female joint 421 provided below the vibration absorber 4 described later (FIG. 9). Reference numeral 2241 indicates a pin groove provided in the male joint 224. A part of the channel 222 is formed in the male joint 224 so as to extend vertically from the center of the upper surface on the axis.

The shell base 3 comprises a cylindrical body 3a and a conduit 3b.
(FIG. 1). The cylindrical body 3a is obtained by fixing a disk 32 to the upper surface of a hollow cylinder 31 and has a hexagonal opening at the center of the disk 32. It is mounted so that it covers the drilling drill from the top of the drilling drill 1 and the nozzle 14 comes out from the opening. The height of the cylindrical body 3a substantially matches the height of the casing 12 of the drill 1 so that the entire casing 12 of the drill is covered. This is to protect the casing 12 from wear caused by shaving during excavation. The inner diameter of the cylindrical body 3a is slightly larger than the outer diameter of the casing 12 to facilitate attachment. A spacer 33 is partially fixed to the inner wall surface of the cylindrical body 3a. This is because the shell base 3 maintains a sense of stability even during the operation of the excavation drill 1.

The conduit 3b is formed of a pipe and has a cylindrical shape 3
a from the upper end 34 of the outer peripheral wall to the cylindrical body 3a while being helically wound and fixed to the lower end 3 near the button bit 11.
Up to 5 are arranged. The reason why the conduit 3b is spirally provided is to prevent the conduit 3b from collapsing the inner wall surface of the borehole as much as possible. Also, this is to prevent the conduit 3b from peeling off from the excavation root compaction liquid injection device due to earth pressure resistance during excavation. This is also to make the excavation root consolidation liquid injection device smoothly enter during the excavation process by the excavation drill 1. The hexagonal column-shaped nozzle 14 fits into the opening 321 of the shell base 3, so that when the drilling drill 1 rotates in a certain direction, the shell base 3 also rotates together.

Reference numeral 4 denotes a vibration absorber (FIG. 1). This hexagonal column hole 41 of the female joint 41 having a hexagonal column hole
1 is fitted with the head portion 422 of the male joint 42 (FIG. 9). Reference numerals 43 and 44 indicate elastic bodies having large elastic deformation. The elastic bodies 43 and 44 absorb the reaction force of the button bit 11. When the female joint 41 and the male joint 42 are assembled with the elastic bodies 43 and 44 interposed therebetween, the vibration absorber 4 forms through holes 413, 423 and 431 vertically passing through the vibration absorber 4. Reference numeral 45 denotes a flange, and reference numeral 46 denotes a flange that allows the flange 45 to move up and down so that the female joint 41 and the male joint 42 are integrated. At the lower part of the male joint 42, the valve 2
Female joint 421 to be fitted with two male joints 224
Is provided. Reference numeral 47 denotes a pin hole. Female joint 42
1 is fitted with the male joint 224 of the valve body 22 and the pin hole 4
7. By inserting the pin 48 into the pin groove 2241, the switching valve 2 and the vibration absorber 4 are connected.

The protective cover 5 is a cylindrical body as shown in FIG. A disk 51 having a hexagonal column hole is fixed to the upper surface of the protective cover 5, and a flange receiver 52 is fixed to the lower surface. Reference numeral 53 connects the upper end with the liquid hole 212,
Shows a guide tube whose lower end is connected to the conduit 3b. The root compaction liquid hole 212 is communicated with the conduit 3b, and the root compaction liquid poured into the root compaction liquid hole 212 is supplied to the lower end 3 near the button bit 11.
5 to transfer the pipe. The protective cover 5
After connecting the switching valve 2 and the vibration absorber 4 with the pin 48, the switching valve 2 is covered from above the vibration absorber 4 and the flange 214
And is fixed to the flange receiver 52 with the stud 54 (FIG. 1). The protection cover 5 protects the switching valve 2 and the vibration absorber 4 from abrasion damage due to shaving during excavation. In addition, in the event that the pins 48 and 6 are cut, the expensive drilling drill 1 can be lifted without remaining in the ground.

The excavating root consolidation liquid injection device is assembled using the above components as follows. The shell base 3 is attached so as to cover the drill base 1 from above. The switching valve 2 is arranged on the disk 32 of the shell base. And the pin hole 21
The pin 2191 is inserted into the through hole formed by the pin 92 and the pin groove 141. After that, the switching valve 2 and the vibration absorber 4 are connected by the pin 48. Next, the protective cover 5 is fixed to the flange 214 with the studs 54, thereby completing the excavation root compaction liquid injection device. This drilling root consolidation liquid injection device
As shown in FIGS. 9 and 10, the female joint 41 of the vibration absorber 4 is used.
The male joint 412 is connected to the screw rod 78. The female joint 781 and the male joint 412 provided at the lower end of the screw rod 78 are connected,
2. By inserting a pin into the cutout groove 414, the screw rod 78 and the vibration absorber 4 are connected.

(2) Drilling root consolidation liquid injection method The excavation root consolidation liquid injection device assembled as described above is installed vertically at the site where the pile is to be embedded. Such an excavating root compaction liquid injection device is attached to, for example, an excavator as shown in FIG. In FIG. 10, reference numeral 71 denotes a motor, and 72 denotes a speed reducer. The screw rod 78 is formed of a hollow pipe through which compressed air passes, and a swivel 91 is connected to an upper end thereof, and a compressed air pipe 92 is connected to the swivel 91. Reference numeral 73 denotes heavy equipment, 7
4 is a lead, 75 is a support pillar, 76 is a wire, and 77 is a slide fitting.

First, a compressed air pipe 9 is compressed by an air compressor.
2. Send compressed air to 2. While the drill 1 is suspended in the air, as shown in FIG.
In order to pull down the valve box 21 from 2, the valve body 22 is disposed at an upper position in the cylindrical hole 21b of the valve box 21. Therefore, the compressed air that has proceeded to the screw rod 78, the vibration absorber 4, and the switching valve 2 also flows out of the drilling drill 1 through the root fixing liquid hole 212. However, when the drill 1 is lowered to the surface,
The valve element 22 descends in the cylindrical hole 21b, and the valve element 22 is disposed at a lower position in the cylindrical hole 21b of the valve box 21, as shown in FIG. At the same time, the channel 222 and the air hole 211 are joined, and the drill 1 is operated. When the compressed air is continuously sent by the air compressor, the ground is excavated while the drill 1 is rotated clockwise.

In this excavation stage, the vibration absorber 4, screw rod 78 and motor 7 above the valve body 22
2. When all the loads of the reduction gear 72 and the like are applied to the valve body 22, the valve body 22 is always disposed at a lower position by the cylindrical hole 21b of the valve box 21. Therefore, these loads remain unchanged in the flow path 2
It functions as an external force for maintaining the bonding between the air holes 22 and the air holes 211. In particular, an operation for joining the flow path 222 and the air hole 211 is not required. The excavating button bit 11 penetrates a solid rock or the like by its destructive force and smoothly excavates. Then, when the predetermined depth is reached beyond the bottom of the pile hole, the supply of the compressed air is stopped and the excavation operation is completed.

Next, the excavating root compaction liquid injection device is slightly lifted. Then, first, the valve body 22 located below the valve box 21
However, the valve box 21 is kept stopped by the weight of the excavation drill 1 and rises in the cylinder of the valve box 21. And pin 6
To the upper position where the valve body 22 is locked to the drilling drill 1
Will also rise from the ground. In such a state, the channel 222 replaces the air hole 211 at the time of excavation with the consolidation liquid hole 2.
12 (FIG. 3). Here, the weight of the drilling drill 1 itself acts as an external force for joining the channel 222 and the consolidation liquid hole 212.

In addition, a micro switch is attached to the lower part of the bay depression 225 so that a signal can be transmitted so as to display on the operation panel of the ground operator that the channel 222 and the consolidation liquid hole 212 are joined. (Not shown). The signal is transmitted wirelessly to the operation panel.
When the micro switch is turned on by being stopped by the pin 6, a radio signal is sent by skipping the passage 222, the through holes 423, 431, 413, and the hollow inside the screw rod 78 through which the compressed air and the consolidation liquid pass.

As described above, the flow path 222 and the liquid
After confirming that they have joined with each other, the drilling root compaction liquid injection device is pulled up to the ground while rotating clockwise, and at the same time as the above operation, cement milk as the root compaction liquid flows into the channel 222, and the conduit 3b The cement milk is discharged from the lower end 35 of the cement milk. Thus, when the excavating device is pulled up to the ground, it is ensured that the desired bottom milk is filled with the desired cement milk. Finally, the prefabricated pile is laid in this borehole that has been filled with cement milk to complete the construction.

(3) Effects of the embodiment When the method for injecting a drilling root consolidation liquid and the apparatus according to the present embodiment are applied to embedding pile work, conventionally, a drilling drill is once taken out, and then cement milk must be injected again. The work that requires two steps, such as the necessity of two steps, can be completed in one step, and the construction period can be significantly reduced. In particular, it showed its power in places where ready-made piles were inserted deeply. The switching valve 2 can easily and reliably switch between the air hole 211 and the consolidation liquid hole 212 by utilizing the gravity of the excavating drill 1 or the screw rod 78, thereby simplifying the device structure. And improved the reliability of switching. Also, the drilling drill 1 operates only in a place where there is earth pressure resistance such as a bedrock, and even if compressed air is sent in due to malfunction, the drilling drill 1 may be in contact with a soft one or in a floating state. Then, because it was stopped, it was also excellent in terms of safety.

Further, the excavating root compaction liquid injection device according to the present invention does not impose any restrictions on the direction of rotation of the excavating drill during excavation or lifting. Therefore, the drilling drill can be lifted to the ground while rotating clockwise, and the excavated material can be brought on the screw rod 78. Here, since the joint between the valve box 21 and each of the components such as the valve body 22 is fitted in a polygonal shape, it does not run idle during rotation. In addition, when the drilling drill is used for a long time, the casing 12 is significantly worn. However, in this embodiment, the damage of the expensive drilling drill 1 is reduced because the shell base 3 surrounding the casing 12 protects the casing. Further, since the shell base 3 covers the excavation drill 1, the sound drilling effect is excellent, and the noise is reduced.

(2) Embodiment 2 In this embodiment, a switching valve 2 as shown in FIGS. 11 and 12 is used instead of the switching valve 2 of the first embodiment. The switching valve 2 has a flow path 22
2 has a substantially “L” -shaped vertical section, and has only one outlet 2221 formed therein. The inlet 2121 of the liquid root consolidation liquid hole 212 relating to the valve box 21 is disposed immediately above the inlet 2111 of the air hole 211. When the valve element 22 descends most inside the cylindrical hole 21b of the valve box 21, the flow path 222 and the air hole 211 are joined. Until the valve body 22 is locked by the pin 6,
When the inside of the cylinder rises the most, the flow path 222
Join with 2. Reference numeral 225 is a bay recess 225. Sign 2
225 indicates a seal ring, and 2224 indicates an elastic body. Other configurations are the same as those of the first embodiment.

The excavating root consolidation liquid injection device thus constructed has a simpler structure than that of the first embodiment, and its production cost is reduced. In the method using this, the operation of the seal ring 2225 accompanying the vertical movement of the valve body 22 is smooth,
Sealability has improved. The seal ring 2225 is
When it is in contact with the inner wall 215 between the base 15 and the consolidation liquid hole 212, it is retracted into the step portion 2223, but when the outlet 2221 meets the inlets 2111 and 1211, the elastic body 2224 It is pushed forward. Furthermore, in the present embodiment, by making the direction of the pin hole 2192 and the direction of the liquid root consolidation liquid hole 212 parallel, the bay depression 225 can be lowered, and even if the valve body 22 rises,
It has become possible to keep the bay recess 225 in the cylindrical hole 21b. Therefore, in the excavation root consolidation liquid injection work,
The vertical movement of the valve body 22 could be normally maintained without concern that soil shavings and the like would get into 5.

(3) Embodiment 3 In this embodiment, an excavating root consolidation liquid injection device using a switching valve 2 as shown in FIGS. 13 to 17 instead of the switching valve 2 of the first embodiment. 13 and 14 are longitudinal sectional views around the switching valve 2. FIG. Reference numeral 21 denotes a bottomed cylindrical valve box. In the valve box 21,
An air hole 211 is provided on the bottom surface, and a consolidation liquid hole 212 is formed on a cylindrical inner wall 215 rising slightly from the bottom surface. The air hole 211 is a core 81 which is urged upward by a spring 82 and is normally in a closed state (FIG. 1).
4). Reference numeral 83 denotes a cylindrical body that houses the core 81 that moves up and down, and a lower end opening 831 of the cylindrical body is connected to the air inlet 15. The core 81 is a cylindrical body having a rounded tip,
The inlet 21 of the air hole 211 whose rounded portion is tapered
The airtightness is maintained by abutting on 11. Core 8
1 has a through hole 811 communicating from the four openings provided in the side wall to the bottom surface. When the core 81 is pressed down against the spring 82, the entrance 2111 of the closed air hole 211 is opened, and the through hole 811 is opened. Drilling drill 1 through the air inlet 1
5 (FIG. 13).

There are four root fixing liquid holes 212 penetrating from the inner cylinder wall 215 to the outer cylinder wall 218. And the root compaction liquid hole 212 is connected to the conduit 3b. Conduit 3b
Is disposed inside the shell base 3 (FIG. 13), descends straight, and is disposed to the lower end 35 of the shell base 3. The shape of the conduit 3b is an ellipse with a flattened cross section as shown in FIG. Reference numeral 22 denotes a valve body 22 having a flow path 222 formed therein. The flow path 222 passes through the valve element 22 vertically, hangs down the axis, and branches off at the lower end into two parts. A small projection 226 is provided on the bottom surface of the valve body 22. This is for making it easier to push down the core 81.

The valve element 22 has a structure in which the sliding portion 221 is extended. The inner diameter of the cylinder of the valve box 21 is adjusted to the sliding part 221 so that the sliding part 221 can move up and down, and the height of the inner wall 215 of the sliding part 221 is made higher than the height of the sliding part 221. When the valve element 22 is at the upper position, the flow path 222
Is formed so that the outflow port 2221 and the consolidation liquid hole 212 communicate with each other (FIG. 14). On the other hand, when the valve element 22 descends to the lower position, as shown in FIG. 13, the small projection 226 lowers the core 81 against the spring 82 and causes the flow path 222 and the air hole 211 to flow.

In the excavating root consolidation liquid injection device and the construction method using the same, the valve element 22 pushes down the core 81 by the weight of the valve element itself during excavation, and compressed air flows from the flow path 222. The drilling drill 1 was able to operate after entering the air hole 211. In addition, even with the vibration of the excavation drill 1, the spring 82 serves as a cushioning material, so that the valve body 22 can be less damaged. When the valve body 22 rises after excavation, the air hole 211 is closed by the bias of the spring 82, and the flow path 222 is connected to the consolidation liquid hole 212 instead. It could be injected reliably. In this embodiment, the vibration absorber 4 shown in FIG. 17 is used. Instead of the flange 46 of the first embodiment, a pin 49 is used.
The female joint 41 and the male joint 42 are connected to each other by 1 and a recess 492. Reference numeral 43 denotes an elastic body. Other main structures are the same as those of the first embodiment. In this embodiment,
The method of fixing the pin 2191 to be inserted into the pin hole 2192 is as shown in FIG. Pin 2191 into pin hole 2192
And fix the pin 2191 with the stud 2196. This is because even if the pin 2191 is broken, the pin does not fall out of the pin hole and the connection state between the excavation drill 1 and the valve body 22 is maintained.

The present invention is not limited to the specific embodiments described above, but may be variously modified within the scope of the present invention depending on the purpose and application. For example, the shapes, sizes, and the like of the valve box 21, the valve body 22, and the core 81 are not limited to the embodiments.

[0037]

As described above, the excavating root compaction liquid injection method and apparatus according to the present invention discharges the root compaction liquid to the shaved bottom while pulling up the excavated main body machine, so that the work can be completed in one process. Excellent effect for shortening the construction period.

[Brief description of the drawings]

FIG. 1 is an overall sectional view showing an embodiment of a drilling root consolidation liquid injection device according to the present invention.

FIG. 2 is a longitudinal sectional view of the switching valve of FIG.

FIG. 3 is a longitudinal sectional view of the switching valve of FIG. 1;

FIG. 4 is a perspective view of a valve element according to the switching valve of FIG. 1;

FIG. 5 is a plan view of a valve element according to the switching valve of FIG. 1;

FIG. 6 is an enlarged sectional view showing the vicinity of an inlet of an air hole in FIG. 2;

FIG. 7 is a perspective view of a protective cover.

FIG. 8 is a cross-sectional view showing a coupling state of a nozzle of a drilling drill and a female joint of a valve box.

FIG. 9 is an exploded perspective view around a vibration absorber.

FIG. 10 is an explanatory view of an excavation state in which the excavating root compaction liquid injection device of FIG. 1 is attached to an excavator.

FIG. 11 is a longitudinal sectional view of a switching valve according to a second embodiment.

FIG. 12 is a plan view of FIG.

FIG. 13 is a longitudinal sectional view around a switching valve according to a third embodiment.

FIG. 14 is a longitudinal sectional view around a switching valve according to a third embodiment.

FIG. 15 is a view taken along line XX of FIG. 13;

FIG. 16 is a cross-sectional view showing a coupling state between the nozzle of the drilling drill and the female joint of the valve box.

FIG. 17 is a longitudinal sectional view of the vibration absorber.

FIG. 18 is a longitudinal sectional view of a conventional pneumatic impact drilling drill.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drilling drill 15 Air inlet 2 Switching valve 21 Valve box 211 Air hole 212 Rooting liquid hole 215 Cylinder inner wall 218 Cylinder outer wall 22 Valve body 221 Sliding part 222 Flow path 2221 Outlet

Claims (3)

(57) [Claims] A pneumatic hammer drilling drill is provided with a cylindrical valve box having a bottom and a valve body having a sliding portion disposed in a cylinder of the valve box and capable of moving up and down. Allowing a flow path to penetrate the valve body,
By the up and down movement of the valve element, the outlet of the flow path, the air hole communicating from the inner wall of the valve box to the air inlet of the drilling drill, and the root consolidation liquid hole penetrating from the inner wall of the valve box to the outer wall of the cylinder Using a drilling root consolidation liquid injection device equipped with a switching valve capable of switching to any one, connecting the outlet of the flow path to an air hole, supplying compressed air to the flow path, and excavating the ground with a drill. Digging to a predetermined depth, then stopping the supply of compressed air and switching so that the outlet of the flow path communicates with the consolidation liquid hole, then pouring the consolidation liquid into the flow path, and excavating the consolidation liquid An excavating root consolidation liquid injection method characterized by injecting the consolidation liquid into the shaved bottom while raising the injection device. 2. A pneumatic impact drilling drill (1) operated by compressed air, a bottomed cylindrical valve box (21) above the drilling drill, and a sliding portion in the cylinder of the valve box. A valve body (22) that can move up and down, and the valve box has an air hole (211) leading from the inner wall of the cylinder to the air inlet of the drilling drill, and separates the air hole from the inner wall of the cylinder to the outer wall of the cylinder. Root consolidation liquid hole (2
12) and a switching valve (2) in which a flow path (222) penetrating through the valve body is formed in the valve body.
By joining the outlet of the flow path relating to the valve element to the air hole, compressed air is sent to the flow path so that the drilling drill can perform excavation, and the valve element is moved. By joining the outlet of the flow channel to the consolidation liquid hole, pouring the consolidation liquid into the flow channel, passing the consolidation liquid hole, and injecting the consolidation liquid into the shaved bottom. Drilling root compaction liquid injection device. 3. A pneumatic striking drilling machine driven by compressed air.
Lil (1) and drilling drill covered from above the drilling drill
Into a tubular shape that covers the casing and inside the tubular shape
A shell base (3) in which a conduit is arranged, and
Installed on the top of the drill, to the air inlet of the drill
Forming an air hole that communicates with a root consolidation liquid hole that communicates with the conduit
And a switching valve switchable to the air inlet or conduit.
(2) a drilling root consolidation liquid injection characterized by comprising:
Input device.