JP3117811B2 - Two-way switching valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a pneumatic striking drill which is operated by compressed air, and then switches from compressed air to a consolidation liquid at a position above the drill, and the drill is once grounded. The present invention relates to a two-way switching valve used in an excavation consolidation liquid injection method capable of continuously injecting a consolidation liquid without removing the liquid. It is used in fields such as construction for foundation piles, where ready-made piles are installed with low noise and low vibration on the ground with rocks and stones.

[0002]

2. Description of the Related Art Conventionally, piles which have been driven by hitting have been excavated in a pile hole having a volume approximately equal to the pile capacity in order to install the pile with low noise and low vibration, and then the method of embedding has been changed. I have. 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 impact drilling drill (Japanese Patent Publication No. 55-25265, Japanese Patent Publication No. 57-35356, Japanese Patent Publication No. 58-58) that exerts power even in excavation of a stone bed or the like by using an 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 piping 5
Compressed air is sent from 3 to the drilling drill 4 to transmit the reciprocating motion of the piston to the button bit 54, and drilling is performed with the impact force of the button bit.

[0003]

However, although the above-mentioned drill is excellent in excavation of a rock layer or the like, a work for excavating and forming a mounting 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 inlet 41 of the drilling drill 4 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. However, the function of the drill was lost.

[0004] The present invention overcomes the above-mentioned problems, and after drilling a pile hole with a pneumatic impact drill, the consolidation liquid is simultaneously placed on the bottom of the pile hole when the device is pulled out. Thus, an object of the present invention is to provide a two-way switching valve capable of switching from compressed air to a consolidation liquid at a position above a drilling drill so that a drilling consolidation liquid injection method for shortening a construction period can be adopted.

[0005]

The two-way switching valve according to the first aspect of the present invention performs a switch from compressed air to a consolidation liquid at a position above the excavation drill after excavation by a pneumatic impact drill. In the drilling root consolidation liquid injection method in which liquid is injected, a gas opening for sending compressed air to the drilling drill and a liquid opening for guiding the consolidation liquid out of the drilling drill are provided on the bottom surface of the bottomed cylindrical shape. A cylindrical body with the valve case (1), and is placed on the bottom surface of the valve case, rotates forward and backward, and penetrates from a supply port provided at the center of the upper surface to an outlet provided eccentrically near the outer periphery of the lower surface. A valve body (2) having a supply path and having an arc-shaped notch in the peripheral wall of the columnar body, housed in a space formed by the notch and the valve box, and fixed to the valve box; A locking piece (3) to be rotated, and when the valve body is rotated forward and stopped at one end of the locking piece, the outflow port moves forward. Consistent with the gas opening, valve body when restrained at the other end of the locking piece rotates in the reverse direction flow outlet is characterized by being configured to match with the liquid openings.

The two-way switching valve according to the second aspect of the present invention is characterized in that the valve body rotates forward or backward and when the switching is completed, the completion of the switching is displayed on an operation panel of a ground operator on the operation panel. A microswitch for transmitting a signal is provided on a contact surface with the switch. Here, "forward rotation" refers to the rotation direction of the motor during digging, and "reverse rotation" refers to the rotation direction of the motor when the digging drill is pulled up to the ground after digging is completed.

[0007]

In the pneumatic impact drilling drill, the motor and the reduction gear rotate the drilling drill, and the button bid drills while applying rotation and impact. According to this, when the speed reducer rotates forward for excavation, the valve body follows and rotates forward. And it is locked to one end of the locking piece
After that, the notch piece that locked the valve body and the valve box to which it is fixed are rotated forward, and the forward rotation of the valve box causes the drilling drill connected to the valve box to also rotate forward. During this excavation, the outflow port coincides with the gas opening, and the valve body is urged to the notch by the speed reducer, so that this does not shift.
On the other hand, when the reduction gear is rotated in the reverse direction after excavating the pile hole, the valve body is stopped at the other end of the locking piece. Then, the valve body is reversely rotated by the reversely rotating speed reducer so that the valve body is urged to the other end of the notch portion.At this time, since the outflow port matches the liquid opening, the excavator is pulled up in this state. If the consolidation liquid is poured into the supply port while the consolidation liquid is being introduced into the drilling drill, the bottom of the pile hole can be filled with the desired consolidation liquid.

[0008]

The present invention will be described below in detail with reference to examples. (1) Embodiment 1 FIGS. 1 to 8 show an embodiment of a two-way switching valve according to the present invention, which comprises a valve box 1, a valve element 2, and a locking piece 3.

The valve box 1 has a bottomed cylindrical shape with an outer diameter substantially equal to the diameter of the screw rod 51, and a gas opening 11 and a liquid opening 12 are provided on the bottom surface at an equal distance from the center. The gas opening 11 communicates with the air inlet 41 of the drill 4 via the air hole 13. On the other hand, the liquid opening 12 communicates with the conduit 61 provided on the outer peripheral wall of the valve box via the through hole 14 reaching the side wall of the valve box 1. The conduit 61 is disposed up to the lower end of the shell base 6 covering the drilling drill 4 (FIG. 7). A hexagonal column hole 15 into which the hexagonal column nozzle 42 of the drill 4 is fitted is formed in the bottom of the valve box 1. Reference numeral 16 denotes a pin groove, into which the hexagonal column nozzle 42 is inserted and inserted into the hexagonal column hole 15, and the pin 4
When the plug 3 is inserted, the valve box 1 is integrated with the drill 4.

The valve body 2 is a columnar body which is mounted on the bottom surface 17 of the valve box 1 and has a notch 21 in which a part of the bottom is cut out at an angle of about 270 degrees in an arc shape (FIGS. 1 and 5). ). The side surface of the cylindrical portion 22 that has not been cut slides on the inner peripheral wall of the cylinder of the valve box 1, and the notch portion 21 slides on the inner peripheral wall of the locking piece 3 without causing lateral blur. The valve body 1 can rotate forward and backward within an angle of about 180 degrees (FIG. 2).

Here, the locking piece 3 has a rotation range of the valve body of approximately 1
An arc-shaped body that is held within 80 degrees , is housed in a space formed by the notch 21 and the valve box 1, and is fixed to the inner peripheral wall of the valve box 1. The height of the locking piece 3 is slightly lower than the notch height of the notch 21 (FIG. 1).

The valve body 2 has a supply port 23 provided at the center of the upper surface.
A supply path 25 is formed to penetrate from the outlet to an outlet 24 eccentrically provided near the outer periphery of the lower surface. The supply passage 25 is connected to a vertically penetrating hole 71 of the female joint 7 fixed to the valve body 2.
Is connected to a compressed air pipe 53 through a screw rod 51 and a swivel 52. The female joint 7 is provided with a pin groove 73 in a hexagonal column joint 72, and the joint 72
Is fixed to the valve body 2 has a cylindrical shape. The outlet 24 is joined to the gas opening 11 (FIGS. 1 and 2) when the valve body 2 is rotated forward (meaning clockwise in this embodiment) and comes to a position where it is stopped at the right end of the locking piece 3. On the other hand, when it comes to a position where it is stopped by the left end of the locking piece 3 by reverse rotation (in this embodiment, left rotation), it is joined to the liquid opening 12 (FIGS. 3 and 4).

Reference numeral 26 denotes a supply passage 23 near the outlet 24.
Shown here is a copper seal ring with a larger diameter attached to it. The reason for using copper is that adhesion is enhanced. Although not shown in the present embodiment, the periphery of the gas opening 11 and the liquid opening 12 is also made of copper to improve the sealing property. Reference numeral 27 denotes an elastic body made of a urethane foam resin having a hollow disk shape, and the seal ring 26 always receives a force biased to the bottom surface 17. This is for improving the sealing property. When the seal ring 26 is tapered at the tip and coincides with the gas opening 11, the seal ring 26 is urged by the elastic body 27, enters the gas opening 11, and comes into close contact with each other to prevent leakage. If the valve body 2 rotates in the reverse direction, in the process of coming off the gas opening 11, the seal ring 26 is pulled into the valve body 2, the valve body 2 is stopped by the locking piece 3, and the outlet 24 is connected to the liquid opening 12. When they match, the seal ring 26
Project from the elastic body 27 and enter the liquid opening 12 (FIG. 3).

The valve body 2 is provided with a slope step 212 at both ends 211 of the notch 21. The microswitch 8 is attached to the slope step 212, and the completion of the normal or reverse rotation is displayed on the operation panel 82 of the ground operator 81. Signal (see FIG. 8). A substrate 83 with a backup power supply is incorporated in the valve body (FIG. 6). FIG.
As shown in FIG. 5, the locking piece 3 also forms the slope 31 so that the limit type microswitch 8 can easily work when the valve body 2 rotates and comes into contact with the locking piece 3. It is transmitted wirelessly to the operation panel 82. Specifically, when the valve body 2 is stopped by the locking piece 3 and the micro switch 8 is turned on, the supply path 2
5, a radio signal is transmitted by skipping the hollow portion through which the compressed air of the through hole 71 and the screw rod 51 passes.

Reference numeral 9 denotes a pressing plate. The push plate 9 is formed of a hollow disk, and after the valve body 2 is placed inside the valve box 3, the push plate 9 is fixed to the valve box 1 such that the push plate 9 comes into contact with the frusto-conical side of the upper portion of the valve body 2. . This is to prevent the valve body 2 from swinging up and down.

Using the two-way switching valve configured as described above,
The following shows examples of excavation and injection of a consolidation liquid into the site where piles are to be embedded (Figs. 7 and 8). FIG. 7 shows the state of attachment of the two-way switching valve of the present invention to the drilling drill 4. Reference numeral 6 denotes a shell base that covers the drilling drill 4, and a hexagonal opening on the upper surface is fitted into the hexagonal column nozzle 42 to be integrated with the drilling drill 4. A conduit 61 is provided on the outer peripheral wall of the shell base 6 from the upper end to the lower end. Here, the upper end conduit 61
Leads to the passage hole 14. The valve box 1 is directly attached to a hexagonal column nozzle 42 of the drill 4 by a pin 43. This is to reduce the number of joints.

Reference numeral 95 denotes a vibration absorber. The head of the male joint 963 is inserted into the hexagonal column hole 962 of the female joint 951 having a hexagonal column hole, so that the male joint 963 can move upward. Reference numerals 964 and 965 denote elastic bodies that elastically deform. The elastic members 964 and 965 absorb the impact reaction force of the button bit 54.

During excavation, the motor 91 and the speed reducer 92 rotate forward, and the screw rod 51, the vibration absorber 95, and the valve body 2 connected thereto also rotate forward. When the valve element 2 rotates forward and is stopped by the locking piece 3, the micro switch 8 operates to notify the operation panel 82 of the operator 81 that the switching has been completed. In this state, compressed air is supplied from the compressed air pipe 53. Then, the button bit 54 is operated and excavation can be performed. Here, since the motor 91 and the reduction gear 92 excavate while giving rotation to the excavation drill 4, when excavating, the valve box 1, the shell base 6, and the excavation drill 4 are correctly fixed with the valve body 2 pressing the locking piece 3. As a result, an external force matching the gas outlet 11 continues to act on the outlet 24 (FIGS. 1 and 2). Therefore, no malfunction occurs.
Reference numeral 55 denotes heavy equipment, 56 denotes a lead, 57 denotes a wire, 5
Reference numeral 8 denotes a slide bracket, and reference numeral 59 denotes a support column.

After digging a desired pile hole, when the motor 91 and the speed reducer 92 are rotated in the reverse direction, the screw rod 5
1, the vibration absorber 95 and the valve body 2 also rotate in the reverse direction. Valve 2
Is in contact with the other end of the locking piece 3, the micro switch 8 attached to the valve body 2 is turned on, and the operation panel 82 of the operator 81 is notified that the switching is completed. During the switching, the valve box 1, the drilling drill 4, and the shell base 6 remain stationary until the reverse rotation is completed. When the switching is completed, the outlet 24
Is secured in a state of being joined to the liquid opening 12. And then
If the consolidation liquid is injected into the compressed air pipe 53 while the motor 91 and the reduction gear 92 are rotated in the reverse direction and the drilling drill 4 is pulled up,
The root consolidation liquid is supplied by the screw rod 51, the through-hole 71, the vibration absorber 95, the supply passage 25 of the valve body, the liquid opening 12, and the passage hole 1.
4. The liquid flows into the conduit 61, and the consolidation liquid is placed at the bottom of the pile hole.

When the drilling drill is pulled up, the valve body 2 is always rotated in the reverse direction so that the locking piece 3 is pressed to rotate the valve box 1, the drilling drill 4, and the shell base 6 in the reverse direction. It receives a forced external force that is joined to the liquid opening 12. Therefore, no root compaction liquid flows into the drilling drill. Thus, when the excavation drill 4 is pulled up to the ground, a desired root compaction liquid is surely filled into the bottom of the pile hole. Finally, a ready-made pile is laid in this pile hole to complete the construction.

(2) Embodiment 2 In this embodiment, the hole diameter near the gas opening 11 of the air hole 13 and near the liquid opening 12 of the passage hole 14 is increased, and after the elastic body 27 is mounted thereon, The ring 26 is fitted (FIGS. 9 and 10). FIG. 9 shows the periphery of the gas opening 11. When the gas opening 11 comes off the outlet 24 and the seal ring 26 is in contact with the bottom of the valve body 2, the inside of the air hole 13 is pressed down. Dive into. And valve body 2
Is rotated and the outlet 24 is joined to the gas opening 11, the seal ring 26 enters the outlet 24 by the elastic force of the elastic body 27, resulting in a structure that enhances the sealing performance (FIG. 10). The same configuration is adopted around the liquid opening 12. Other structures are the same as in the first embodiment.

(3) Effects of the Embodiment The two-way switching valve according to the embodiment has a simple structure, and if it is used, the switching between the compressed air and the consolidation liquid can be surely performed. Then, the rotation operation of the motor 91 and the speed reducer 92 can be used for the switching operation as it is. In addition, due to the internal configuration of the two-way switching valve, the rotation of the motor also acts as an external force for reliably maintaining the supply path of the compressed air or the consolidation liquid. Specifically, the forward rotation of the motor 91 and the speed reducer 92 acts as an external force for joining the outlet 24 to the gas opening 11, and the reverse rotation acts as an external force for joining the outlet 24 to the liquid opening 12. There was no possibility that the leak or the consolidation liquid was mistakenly guided to the drill 4. Further, when the switching is completed by the forward or reverse rotation of the valve body 2, the micro switch 8 operates and is transmitted to the operator 81, so that the driving operation can be performed with more reliable information. The operator's erroneous operation was prevented.
In this way, the drilling drill was pulled up to the ground while rotating in the reverse direction, and simultaneously with this operation, the consolidation liquid could be reliably discharged to the bottom of the pile hole, and the construction period was greatly shortened.

The present invention is not limited to those shown in the above specific embodiments, but can be variously modified within the scope of the present invention depending on the purpose and application. The microswitch may use a magnetic force or the like in addition to the limit method. In addition, transmission to the operator is not limited to wireless, but also includes transmission of wiring. The display on the operation panel of the ground operator may be an auditory display as well as a visual display. Further, the material of the elastic body may be any material as long as it is made of an elastically deformable material such as synthetic resin or synthetic rubber.

[0024]

As described above, if the two-way switching valve of the present invention is used, a piling hole is drilled with a pneumatic impact drill, and then when the drilling hole is pulled out, the consolidation liquid is placed in the pile hole. Thus, the two steps of the excavation step and the consolidation step can be accomplished in one step, and the working efficiency can be greatly improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a two-way switching valve according to a first embodiment.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is a longitudinal sectional view showing a state in which the valve body of FIG. 1 is rotated in the reverse direction and stopped at the other end of the locking piece.

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

FIG. 5 is an explanatory perspective view of a valve body and a female joint according to the first embodiment.

FIG. 6 is an enlarged sectional view around a slope step of the valve element.

FIG. 7 is a longitudinal sectional view showing the two-way switching valve of the first embodiment attached to a drilling drill.

FIG. 8 is a side view of the excavation using the excavation root consolidation liquid injection method with a two-way switching valve.

FIG. 9 is an enlarged cross-sectional view around a gas opening according to a second embodiment.

FIG. 10 is an enlarged cross-sectional view around a gas opening according to a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve box 11 Gas opening 12 Liquid opening 2 Valve 21 Notch 23 Supply port 24 Outlet 25 Supply path 3 Locking piece 4 Drilling drill 8 Micro switch

Claims (2)

(57) [Claims] An excavating root consolidation liquid injection method in which after excavation by a pneumatic impact type excavation drill, a switch is made from compressed air to a consolidation liquid at a position above the excavation drill to inject the consolidation liquid. A valve box (1) provided with a gas opening for sending compressed air to the drilling drill and a liquid opening for guiding the consolidation liquid out of the drilling drill, and a cylindrical body, It has a supply path which is placed on the bottom of the valve box, rotates forward and backward, penetrates from a supply port provided in the center of the upper surface to an outlet provided eccentrically near the outer periphery of the lower surface, and has a circular shape on the peripheral wall of the cylindrical body. A valve body (2) having an arc-shaped notch, and a locking piece (3) housed in a space formed by the notch and the valve box and fixed to the valve box; Is rotated forward and stopped at one end of the locking piece, the outlet coincides with the gas opening, and the valve body rotates in the reverse direction to lock. A two-way switching valve for use in an excavation root consolidation liquid method, wherein the outlet is aligned with the liquid opening when stopped at the other end of the piece. 2. When the switching is completed by the forward or reverse rotation of the valve body, a signal is transmitted to a contact surface between the valve body and the locking piece so that the completion of the switching is displayed on an operation panel of a ground operator. 2. The two-way switching valve according to claim 1, further comprising a micro switch.