JP2785251B2 - 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 excavation root compaction liquid for embedding a ready-made pile in a hole excavated in the ground. 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 having rocks and rock layers.

[0002]

2. Description of the Related Art Conventionally, a method for excavating a hole that is approximately the same as the volume of a pile to be installed with low noise and low vibration in a ready-made pile that has been driven by hitting has been shifted to a method of embedding the hole. In this method, pile support is weakened because the soil around the pile and the ground at the tip of the pile are roughened. However, a consolidation liquid (such as cement milk) is injected for the purpose of improving this. Here, a pneumatic striking drilling drill (Japanese Patent Publication No. 55-2) that exerts its power in drilling rocks and the like using the impact motion by compressed air operation
No. 5265, JP-B-57-35356, JP-B-58-5354, etc.), and are called by names such as down-the-hole hammer and super drill (JP-B-63-52197). For example, in a down-the-hole hammer drill, compressed air is sent to the air inlet 15 by an air compressor (not shown) as shown in FIG. 5 and the reciprocating motion of the piston 16 is transmitted to a button bit (commonly referred to as 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, when a method of switching and injecting the consolidation liquid from the air into the air inflow hole 15 through which the compressed air flows is used to shorten the construction period, the consolidation liquid stays inside the drilling drill having a complicated mechanism. This resulted in a loss of functionality.

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]

SUMMARY OF THE INVENTION The gist of the first invention is that
A pneumatic impact drilling drill operated by compressed air;
A conduit disposed on the peripheral wall of the cylindrical body covered with the rill.
Using the drilling root compaction liquid injection device provided,
After drilling to a predetermined depth with Lil's button bit,
And injecting a consolidation liquid into the conduit.
It is in the root consolidation liquid injection method. In the drilling root consolidation liquid injection method of the second invention, a shell base provided with a conduit is mounted on an outer peripheral wall of a cylindrical body so as to cover a casing of a pneumatic impact drilling drill. Using a drilling root consolidation liquid injection device having a supply passage at an upper position and having a rotating body having a rotation body for rotatingly connecting the outlet of the supply passage to the air inlet of the drilling drill or the conduit, The compressed air is supplied to the supply path by communicating the supply path with the air inlet, and the drill bit is drilled to a predetermined depth of the ground with a button bit of a drill while rotating the drilling consolidation liquid injection device in a certain direction, After that, the supply of the compressed air is stopped, the supply path of the rotating body is switched to communicate with the conduit, and then the excavation of the excavation root consolidation liquid injection device is performed while supplying the consolidation liquid to the supply path. Pull out and drill holes while rotating in the opposite direction And they said to come by injecting root hardening solution to end.

[0006] In the third aspect of the present invention, the excavating root consolidation liquid injection device is provided with a pressure
Pneumatic impact drilling drill (1) using compressed air
Cylindrical shape provided to cover the casing of the drilling drill
(2a) and a conduit (2) disposed on the peripheral wall of the cylindrical body.
b) a shell base (2) comprising:
Above the drilling hole and communicates with the air inlet of the drilling drill.
Feeding compressed air for operating the rill or communicating with said conduit
And a switching valve that can switch whether to send the consolidation liquid.
It is characterized by The drilling root compaction liquid injection device according to the fourth aspect of the present invention includes a pneumatic impact drilling drill (1) operated by compressed air, a cylindrical body (2a) provided so as to cover a casing of the drilling drill, and the cylindrical shape. A shell body (2) comprising a conduit (2b) disposed on the outer peripheral wall of the body; an air hole communicating with an air inlet of the drilling drill at a position above the shell body; and a root communicating with the conduit. A guide tube (3) having a compacting liquid hole, and a supply tube mounted inside the guide tube, having a supply passage and rotating left and right so that the outlet of the supply passage can be set to the air hole or the root compaction liquid hole. A rotating body (4) adapted to be switchable and connectable to the rotating body (4), and when the rotating body reaches one rotation stop position, the supply path communicates with the air inlet hole of the drilling drill via the air hole; When it comes to another rotation stop position, the supply path passes through the It said conduit and communicating, characterized by being configured to inject through said conduit switching the rotary body after prior excavation of the ground roots solidify liquid Te.

[0007] "Right and left rotation" means that the robot rotates within a certain angle without performing a full circle motion, and means that its angular range is not limited. The term "rotating member adapted to be switchable and joinable" refers to a rotating member serving as a switching valve capable of moving an outflow port to be adjusted to one of an air hole and a consolidation liquid hole. The “supply path” is a flow path through which compressed air is sent during excavation, and a flow path connected to a ground pipe to which the consolidation liquid is supplied when the excavation consolidation liquid injection device according to the present invention is pulled up after the excavation. The flow path may be formed by drilling or the like, or may be formed by a pipe.

[0008]

According to the excavation root consolidation liquid injection method and apparatus of the present invention, the switching valve (rotary body in the second and fourth aspects of the present invention) is used.
Therefore, in the step of excavating the ground, the outlet of the supply path is communicated with the air inflow hole toward the inside of the drilling drill body, and compressed air is sent into the supply path. Can drill holes in rock formations. Then, after drilling the ground, when pulling up the drilling drill, the outlet of the supply channel is connected to the conduit. The root consolidation liquid, which is a material for generating a supporting force, can be injected into the container.

[0009]

The present invention will be described below in detail with reference to examples. (1) Configuration of Drilling Root Consolidation Liquid Injection Apparatus FIGS. 1 to 4 show one embodiment of a digging root consolidation liquid injection apparatus according to the present invention, in which a digging drill 1 and a shell base 2 are shown.
, A guide cylinder 3, a rotating body 4, a pin 5, and a push plate 6.

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. The energy is transmitted to the button bit 11 to pierce the button bit 11 with the impact force of the button bit. The internal mechanism is the same as that shown in FIG. Reference numeral 12 denotes a casing, reference numeral 13 denotes a hexagonal prism-shaped back head, and reference numeral 14 denotes a nozzle having an air inlet hole 15. The nozzle 14 is notched with a pin groove 141.

The shell base 2 comprises a cylindrical body 2a and a conduit 2b.
Consists of The cylindrical body 2 a has a disk 22 fixed to the upper surface of a hollow cylinder 21, and has a hexagonal opening 221 at the center of the disk 22. Cover the drilling drill from the top of the drilling drill 1, and open the back head 13 and the nozzle 1 from the opening 221.
4 is attached. The height of the cylindrical body 2a substantially matches the height of the casing 12 so that the entire casing 12 of the drilling drill is covered. The inner diameter of the cylindrical body 2a is slightly larger than the outer diameter of the casing 12 to facilitate attachment. A spacer 23 is partially fixed to the inner wall surface of the cylindrical body 2a. Shell base 2 even during operation of drilling drill 1
Is to maintain a sense of stability.

The conduit 2b is constituted by a pipe,
a from the upper end 24 of the outer peripheral wall to the cylindrical body 2a while being spirally wound and fixed to the lower end 2 near the button bit 11.
Up to 5 are arranged. The reason why the conduit 2b is provided spirally is to prevent the conduit 2b from collapsing the inner wall surface of the borehole as much as possible. Also, this is to prevent the conduit 2b from being peeled off from the excavation root compaction liquid injection device due to earth pressure resistance during excavation. This is also to ensure that the drilling root consolidation liquid injection device smoothly enters and enters the drilling process by the drilling drill 1. The hexagonal prism-shaped back head 13 fits into the opening 221 of the shell base 2, so that when the drill 1 rotates in a certain direction, the shell base 2 also rotates.

The guide cylinder 3 has a substantially cylindrical shape, and its outer diameter is made substantially coincident with the outer diameter of the cylindrical body 2a, and a concave recess 31 is formed so that the rotating body 4 can be placed thereon. The guide cylinder 3 is a disk 2 of the shell base 2.
2 is placed on top. As shown in FIGS. 3 and 4, the concave portion 31 forms a substantially columnar concave portion, and the arc-shaped locking piece 3
7 is fixed to a part of the inner peripheral wall of the recess 31. Hollow 31
The bottom 32 has a mounting hole 33 into which the nozzle 14 and the upper part of the back head 13 of the drilling drill 1 are fitted. A hexagonal column-shaped depression 39 is formed in the lower part of the mounting hole 33, and the upper part of the back head 13 fits therein. This is for linking the guide cylinder 3 to the rotation of the excavation drill. As shown in FIG.
The air inlet hole 15 of the nozzle 14 is
Is formed. The air hole 34 communicates with the mounting hole 33, and when the back head 13 and the nozzle 14 are set in the mounting hole 33, the air hole 34 communicates with the air inflow hole 15 in an airtight state. I have. Reference numeral 331 indicates a locking groove.

A liquid hole 35 is formed on the bottom surface of the recess 31 so as to be point-symmetric with the air hole 34 and equidistant from the center of the bottom surface. The root consolidation liquid hole 35 is connected to a short pipe 38 provided on the outer peripheral wall of the guide cylinder 3 through a passage hole 36 directed to the side wall of the guide cylinder 3,
The short pipe 38 is configured to be connected to the conduit 2b located at the upper end 24 of the cylindrical body 2a. Reference numeral 5 indicates a pin, and when the shell base 2 and the guide cylinder 3 are attached to the drilling drill 1,
When a pin hole is formed by the pin groove 141 and the locking groove 331, and the pin 5 is inserted through the pin hole, the excavation drill 1, the shell base 2, and the guide cylinder 3 are integrated and cannot be removed. The guide tube 3 can be divided into an upper portion and a lower portion, and the upper portion is as shown in FIGS.

The rotating body 4 is a columnar body which is placed in the concave recess 31 of the guide cylinder 3 and has a cutout 41 in which a part of the bottom is cut out in an arc at an angle of about 270 degrees. The side surface of the cylindrical portion 42 which is not notched slides on the periphery of the concave portion 31 and the notched portion 41
Slides on the inner peripheral wall of the locking piece 37 on the side face thereof,
Can be rotated left and right within an angle of about 180 degrees. The notch height of the notch 41 is slightly higher than the height of the locking piece 37 (FIG. 3). A supply path 43 penetrating from the upper surface to the lower surface is formed in the rotating body 4. On the upper surface, the supply path 43 is located at the center when the rotating body 4 is placed inside the guide cylinder 3, and at the outlet 44 on the lower surface, the rotating body 4 is rotated clockwise and stopped by the locking piece 37. When it comes to the air hole 34 (FIG. 3), when it comes to a position where it is rotated counterclockwise and is stopped by the locking piece 37, it comes to join to the consolidation liquid hole 35.
Reference numeral 45 denotes a seal ring, and reference numeral 46 denotes an elastic member. When the outlet 44 of the supply passage 43 is joined to the air hole 34 or the root compaction liquid hole 35, the seal ring 45 is urged by an elastic member 46 to seal. Reference numeral 47 denotes a sealing plate for preventing leakage.

The push plate 6 is formed of a hollow disk. After the rotary body 4 is placed inside the guide tube 3, the push plate 6 is placed on the upper surface of the rotary body 4.
Are fixed to the guide tube 3 so as to abut. Rotating body 4
In order to eliminate swinging in the vertical direction.

Using the above components, the excavating root consolidation liquid injection device is assembled as follows. The excavation drill 1 is mounted so as to cover the shell base 2 from above. The guide cylinder 3 is arranged on the disk 22 of the shell base. And the locking groove 33
The pin 5 is inserted into a pin hole formed by the pin groove 1 and the pin groove 141. Thereafter, the short pipe 38 and the conduit 2b are connected. Next, the rotating body 4 is placed inside the guide tube 3, and finally, the presser plate 6 is fixed to the guide tube 3 to complete the excavation root compaction liquid injection device.

(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. Then, it is confirmed that the outflow port 44 of the rotating body 4 communicates with the air inflow hole 15 of the drilling drill, compressed air is sent in by an air compressor, and the ground is excavated in advance while rotating the drilling consolidation liquid injection device clockwise. I do. Here, at the time of excavation, the state where the outflow port 44 is joined to the air hole 34 is maintained, and the compressed air is always supplied to the supply path 43. Excavation work proceeds under such conditions. Under this condition, the rotating body 4 is also urged in the clockwise direction, whereby the rotating body 4 presses the locking piece 37, and an external force is applied to align the outlet 44 with the air hole 34. . 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, when the rotating body 4 is switched by rotating the rotating body 4 counterclockwise, the rotating body 4 is stopped from rotating by the locking piece 37, and the state where the outlet 44 is joined to the conduit 3 is secured. Although the rotating body 4 is stopped at a position opposite to the position where the locking piece 37 abuts during excavation, the excavation root consolidation liquid injection device is pulled out while rotating counterclockwise in the opposite direction to the excavation. This time, an external force is applied to the rotating body 4 so that the outflow port 44 and the consolidation liquid hole 35 always coincide. After that, the drilling root consolidation liquid injection device is pulled up to the ground while rotating counterclockwise, and the cement milk flows into the supply passage 43 simultaneously with the above operation, and the conduit 2b
The cement milk is discharged from the foremost part 26 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 excavating root consolidation liquid injection method and the apparatus according to the present embodiment are used for embedding pile work, conventionally, once the excavation drill is once taken out, 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. Further, in the present embodiment, a ready-made drilling drill is used as it is, and the conduit 2b or the like is not directly attached to the casing 12 by welding or the like. Therefore, cracks or the like shorten the life of the drilling drill. There was no hindrance to the operation of the piston 16 due to dimensional deviation or the like. Particularly, although the cemented carbide is used for the casing 12 of the drill for drilling a hard rock layer, according to the present embodiment, the material is not changed by welding or the like. Further, when the drill is used for a long time, the casing 12 is significantly worn. However, since the shell base 2 surrounding the casing 12 protects the casing, damage to the expensive drill 1 is reduced. In addition, since the shell base 2 covers the excavation drill 1, it is excellent in soundproofing effect and leads to noise reduction. And the casing 12
Since the conduit 2b is not directly fixed to the hole, there is a degree of freedom, and the desired hole can be excavated by replacing the button bit 11 and the shell base 2 according to the required hole diameter.

The present invention is not limited to the above-described specific embodiments, but may be variously modified within the scope of the present invention according to the purpose and application. For example, a reinforcing member may be attached to the conduit 2b in order to avoid earth pressure resistance to the conduit 2b. When the earth pressure resistance is low, a straight pipe that is formed inside the guide cylinder 3 and that is directly connected to the annular body and that hangs down may be used for the conduit 2b. Further, the guide cylinder 3 may not be separated from the shell base 2 as in this embodiment, but may be integrated.

[0022]

As described above, according to the method and the apparatus for injecting the excavating root compaction liquid of the present invention, the root compaction liquid is discharged after the excavation hole while pulling up the excavated main body machine.
Completes the work in the process and exhibits an excellent effect of shortening the construction period.

[Brief description of the drawings]

FIG. 1 is an overall explanatory diagram showing one embodiment of a drilling root compaction liquid injection device according to the present invention.

FIG. 2 is an exploded explanatory view of FIG.

FIG. 3 is an enlarged cross-sectional view around a rotating body of FIG. 1;

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a longitudinal sectional view of a conventional pneumatic impact drilling drill.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drilling drill 11 Button bit 12 Casing 15 Air inflow hole 2 Shell base 2a Cylindrical body 2b Conduit 3 Guide cylinder 34 Air hole 35 Rooting liquid hole 4 Rotating body 43 Supply path 44 Outlet

Claims (4)

(57) [Claims] 1. A pneumatic striking drilling machine operated by compressed air.
A rill and a drill disposed on the peripheral wall of the cylindrical body covered by the drill
Using a drilling consolidation liquid injection device comprising:
Then, drill to a predetermined depth with the button bit of the drilling drill
After shaving, subsequently injecting the root compaction solution into the conduit
Excavation root consolidation liquid injection method. 2. A shell base provided with a conduit on an outer peripheral wall of a cylindrical body so as to cover a casing of a pneumatic impact drilling drill, and a supply passage is provided at a position above the shell base. In addition, using a drilling root consolidation liquid injection device having a rotating body for rotatingly connecting the outlet of the supply path to the air inflow hole of the drilling drill or the conduit, the supply path and the air inflow hole are used in advance. To supply compressed air to the supply path, excavate to a predetermined depth in the ground with a button bit of a drilling drill while rotating the drilling consolidation liquid injection device in a fixed direction, and then stop supplying compressed air. Switching to connect the supply path of the rotating body and the conduit, and then withdrawing while rotating the excavation root consolidation liquid injection device in the opposite direction to the excavation while supplying the consolidation liquid to the supply path; Inject the consolidation liquid into the drill hole tip An excavation root consolidation liquid injection method characterized by the following: 3. A pneumatic striking drilling machine driven by compressed air.
To cover the drill (1) and the casing of the drill.
A cylindrical body (2a) to be provided and disposed on a peripheral wall of the cylindrical body
A shell body (2) comprising a conduit (2b) to be provided;
Above the drilling drill and into the air inlet of the drilling drill
Communicating compressed air for operating the drilling drill or
It is possible to switch whether to send the consolidation liquid by communicating with the conduit
A switching valve, and a drilling root consolidation liquid injection characterized by comprising:
apparatus. 4. A pneumatic impact drilling drill (1) operated by compressed air, a cylindrical body (2a) provided to cover a casing of the drilling drill, and an outer peripheral wall of the cylindrical body. Shell body (2) comprising a conduit (2b)
A guide tube (3) having an air hole communicating with an air inflow hole of the drilling drill and a consolidation liquid hole communicating with the conduit at a position above the shell base; and a guide tube mounted inside the guide tube. A rotating body (4) having a supply path and being rotatable left and right so that an outlet of the supply path can be switched and joined to the air hole or the consolidation liquid hole. When the rotation stop position is reached, the supply path communicates with the air inflow hole of the drilling drill through the air hole, while when the rotation stop position is reached, the supply path communicates with the conduit through the consolidation liquid hole. And an excavating consolidation liquid injection device configured to switch the rotating body after the previous excavation of the ground and to inject the consolidation liquid through the conduit.