JP2512641B2 - Chemical liquid injection method for ground reinforcement work and chemical liquid injection device for ground reinforcement bar pushing machine - 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 for injecting a chemical liquid in a ground reinforcement work for reinforcing a soft ground such as a slope to prevent the ground from collapsing, and a chemical liquid injection device in a bar pushing machine for ground reinforcement. Regarding

[0002]

2. Description of the Related Art As a conventional technique, for example, Japanese Patent Laid-Open No. 63-
There is Japanese Patent Publication 21718. In this publication, a rock bolt having a through hole is subjected to a rotational force and a striking force to dig a hole drill bit attached to the tip of the lock bolt into the ground to drill a hole, and air, water, foam, etc. Through the through hole of the rock bolt into the drill hole, and the jet flow discharges dust and dirt in the drill hole to the outside of the drill hole, and after completing the driving of the lock bolt, the grout into the through hole of the rock bolt. There is disclosed a ground reinforcement method in which the space is pressure-fed to fill the gap between the hole wall and the lock bolt.

[0003]

In the above method, not only the time required for drilling is long, but also during the drilling process, the dust and the sand generated by the drilling are discharged, and the grout is injected after the driving of the lock bolt is completed. Therefore, there is a problem that the work time becomes inefficient because it requires a work time in which the drilling time and the grout injection time are added. In addition, if part of the drill hole collapses during drilling work, it will be difficult for the grout to flow into the downstream of the collapsed position, and it will not be possible to evenly fill the grout. There is. SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems, to make the ground reinforcement work more efficient, and to improve the ground reinforcement effect.

[0004]

According to a first aspect of the present invention, there is provided a gripping mechanism for holding a hollow rod for reinforcing the ground by a chuck mechanism mounted on a rectilinear member which is driven and controlled forward and backward. The pushing force for sequentially shifting the position to the rear position and pushing the hollow bar material to the front intermittently, and the vibrating mechanism which is mounted on the rectilinear member and moves jointly with the chuck mechanism at each time of pushing the hollow bar material. while repeated continually pushing push saw operation a hollow rod into the ground by a propelling force that combines a vibration force transmitted to the hollow rod through the chuck mechanism, the straight
When the member moves forward, the chuck mechanism and the vibrating mechanism
A chemical for ground reinforcement is discharged from the vicinity of the front end of the hollow rod is supplied from the rear end to the hollow bar in the chemical liquid supply mechanism when propelling the hollow rod, the chuck mechanism is hollow
Hollow bar when the bar is released and the rectilinear member retracts
Stop supplying chemicals to the hollow bar
Characterized in that the intermittent chemical liquid discharging operation synchronized with the filling operation is repeated, and the chemical liquid is filled into the entire gap between the hollow bar member almost entirely buried in the ground and the hole wall around it. According to the invention of Item 2, a rectilinear member installed on the laterally elongated guide member so as to be rectilinearly movable in the longitudinal direction thereof, and a feed mechanism for advancing and retracting the rectilinear member in the longitudinal direction of the guide member are coupled, The rectilinear member includes a chuck mechanism that grips a part of the ground reinforcing hollow bar member pushed into the ground by changing its gripping position, and a hollow bar member through the chuck mechanism when the rectilinear member advances. In a ground reinforcement rod pushing machine equipped with a vibration mechanism that transmits vibration force to the ground, the hollow rod is connected to the rear end of the hollow rod pushed into the ground and almost the entire hollow rod is embedded in the ground. After that, a flexible liquid supply pipe that is removed from the hollow bar, When the rectilinear member moves forward together with the hollow bar, the ground reinforcement chemical is supplied into the hollow bar through the liquid supply pipe to be discharged from the vicinity of the front end of the hollow bar and the chuck mechanism releases the hollow bar. Then, when the rectilinear member retracts, the supply of the chemical liquid to the hollow rod is stopped ,
Intermittent with the intermittent pushing motion of the empty bar
A chemical liquid supply control mechanism that repeats the chemical liquid discharging operation is provided.

[0005]

In the ground reinforcement work, when the rectilinear member equipped with the chuck mechanism and the vibration mechanism moves forward, the chuck mechanism holding a part of the hollow rod advances and the hollow rod is pushed forward. During the forward movement of the rectilinear member, the vibrating mechanism operates and the vibrating force of the vibrating mechanism is transmitted to the hollow rod through the chuck mechanism. The hollow rod pushes the hollow rod forward, and It is pushed into the ground by the propulsive force combined with the vibration force. When the hollow rod is pushed into the ground by the amount of the stroke of the rectilinear member, the gripping position at which the chuck mechanism holds the hollow rod shifts to the rear position and the pushing operation is repeated. Then, in synchronization with the forward movement of the rectilinear member, the chemical liquid supply control mechanism operates, and when the rectilinear member advances, the chemical liquid is supplied to the rear end of the hollow rod through the liquid supply pipe and gradually pushed into the ground. The chemical liquid discharged from the vicinity of the front end of the hollow rod is sequentially filled in the gap between the hollow rod and the hole wall around the hollow rod.

[0006]

Since the present invention is configured as described above, it is possible to simultaneously perform the work of burying the hollow rod in the ground and the work of injecting the chemical liquid around the hollow rod,
The ground reinforcement work can be made much more efficient than the conventional method, and the work time can be shortened and the reinforcement work period can be shortened.
In addition, the chuck mechanism changes the gripping position for gripping the hollow bar material and intermittently applies a propulsive force to the hollow bar material to gradually push the hollow bar material into the ground, and the chemical solution is simultaneously pushed during the pushing stroke. Since it is injected, it is possible to precisely inject and fill the liquid around the hollow rods in the ground, embedding each hollow rod into the ground, and injecting the liquid around the hollow rods. It is possible to stably and smoothly perform combined work with work. Further, since the chemical liquid is supplied to the hollow rod only when the hollow rod is advanced, it is possible to always discharge an appropriate amount of the chemical liquid from the hollow rod, and it is possible to eliminate the excessive injection of the chemical liquid into the ground, Unlike the conventional method in which the chemical solution is injected in the post-process after the rod is embedded, it is possible to eliminate the problem of uneven injection of the chemical solution due to clogging due to collapse of the hole wall, and the hollow chemical solution. It can be injected around the bar uniformly over its entire length. Furthermore, when reinforcing the ground, the chemical liquid injected around each hollow bar embedded in the ground enhances the adhesion between the hollow bar and the ground, increasing the slip resistance of the hollow bar and increasing the softness. The solid ground can be reinforced strongly and effectively, and since the injected chemical liquid adheres to the outer peripheral surface of the hollow rod, it is possible to enhance the anticorrosion effect on the embedded hollow rod. Particularly, according to the present invention, the hollow rod is
The chemical solution is discharged only when it is pushed in, and every time the hollow bar is pushed in.
Was pushed into the hollow rod by one pushing operation
Filling the drug solution between the site and the hole wall around it
So, the hollow bar pushed into the ground and the hole wall around it
The hollow bar is pushed by one pushing operation.
Appropriate amount of chemical solution for the gap of the length corresponding to the length
Are sequentially discharged to fill the gap between the hollow bar and the hole wall over its entire length.
It is possible to fill the Tatte neither too much nor too little liquid chemical, medium Sorabozai
The amount of chemicals to be filled around
It is possible to improve the adhesion effect between the ground and the hollow bar by injection.
it can.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a first embodiment of a chemical liquid injecting device in a ground reinforcement rod pushing machine of the present invention and a method for reinforcing the ground while injecting a chemical liquid by using this chemical liquid injecting device will be described with reference to FIGS. It will be described with reference to FIG. The hollow rod B for reinforcing the ground, which is embedded in the ground G requiring reinforcement, is formed of an iron material in the shape of an elongated hollow round bar, and a chemical liquid (grout) for circulating the ground is circulated in the hollow rod B. The chemical liquid passage is formed in a longitudinal shape along the longitudinal direction, and an appropriate number of discharge holes for discharging the chemical liquid are formed near the front end of the hollow rod B. Each hollow bar B is pushed into the ground G with a cone having a conical shape whose maximum outer diameter is slightly larger than the outer diameter of the hollow bar B attached to the front end. However, it is also possible to push the hollow rod B into the ground G without processing the tip thereof.

In a ground reinforcement rod pushing machine which is mounted in place of a bucket on a hydraulic excavator vehicle S for sequentially forcibly pushing a large number of hollow rods B into the ground G, a tip of an arm S1 of the hydraulic excavator vehicle S is installed. Also, a support portion 1a that is laterally extended is formed at the lower end of the connecting bracket 1 that is connected so as to be tiltable in the vertical direction via a link mechanism provided at the tip of the piston rod of the hydraulic cylinder S2. On the upper surface of the support portion 1a, a central portion of a horizontally elongated guide member 2 having a pair of left and right guide rails 2a arranged in parallel with a U-shaped vertical cross section is connected. Guide member 2
A foot pad 2b that is pierced into the ground G and restrains and fixes the front end of the guide member 2 is formed to project in a sharp shape at the front end of the guide member 2, and the front stopper 2c and the rear stopper 2c are provided near the front end portion and the rear portion of the upper surface of the guide member 2. The stoppers 2d are respectively provided so as to project. On the upper surface of the rear end portion of the guide member 2, a hollow bar B is inserted, and a support piece 2e for guiding and holding the hollow bar B in a posture parallel to the guide member 2 is attached.

On the guide member 2, a base plate-like straight-moving member 3 which is guided by both guide rails 2a and moves straight in the longitudinal direction of the guide member 2 is slidably installed. Between the guide rails 2a, the front protrusion 3 of the rectilinear member 3
piston rod 5a connected to a via a connecting pin 4
The feed cylinder 5 having a base end connected to the rear end of the guide member 2 is installed to move the rectilinear member 3 forward and backward toward the ground side and the opposite ground side. The rectilinear member 3 advances and retreats together with the piston rod 5a of the feed cylinder 5 between the advancing end position where the rectilinear member 3 contacts the front stopper 2c and the retracting end position where the rectilinear member 3 contacts the rear stopper 2d. .

A main body 6 having a piston (not shown) built therein which is axially reciprocally driven by pressure oil is provided on the rectilinear member 3.
a and a switching valve 6b for switching the flow of pressure oil in the main body 6a
And a hammer 6c which is inserted into the front end of the main body 6a and is repeatedly tapped by the piston in a state where the vicinity of the front portion is projected forward of the main body 6a. It is installed so that it can move forward and backward.

A chuck mechanism 7 for gripping a part of the hollow rod B by changing its gripping position is installed at the front part on the rectilinear member 3 so as to be able to move forward and backward together with the rectilinear member 3. The chuck body 7a of the chuck mechanism 7 is vertically inserted near the rear end thereof and is connected to the vibrating mechanism 6 via a locking pin 9 that is engaged with a locking recess 8 of a hammer 6c of the vibrating mechanism 6.

Inside the chuck body 7a, a piston rod 10 which moves back and forth in a direction orthogonal to the moving direction of the hollow rod B is formed.
A swing cylinder provided with a chuck cylinder a is supported by a support shaft 11 in the chuck body 7a so as to be swingable in the left-right direction, and is urged clockwise by a spring (not shown) in the clockwise direction. 12
And the swing chuck 1 on the inner wall surface of the chuck body 7a.
The block chuck 14 is attached so as to face 2 and the tip of the piston rod 10a of the chuck cylinder 10 is in contact with the tip of the swing chuck 12.

Piston rod 1 of chuck cylinder 10
0a is advanced, the swing chuck 12 is pushed toward the hollow bar B by the piston rod 10a, and the hollow bar B
Part of the swing chuck 12 and the block chuck 14
It is pinched immovably between and. When the chuck mechanism 7 advances together with the rectilinear member 3 in this state, the hollow bar B is pushed forward together with the chuck mechanism 7 by a length corresponding to the advancing stroke of the rectilinear member 3.

Piston rod 1 of chuck cylinder 10
When 0a retreats, the swing chuck 12 is released and swings toward the side opposite to the block chuck 14 by the elastic force of the spring, and the holding state of the hollow rod B is released.

A control box 15 installed at the rear end of the guide member 2 has a feed valve 16 for switching and controlling the supply of pressure oil to the front oil chamber and the rear oil chamber of the feed cylinder 5, and a vibration mechanism 6. Breaker valve 17 for switching and controlling the supply and stop of supply of the pressure oil of the chuck cylinder 1
A chuck valve 18 for switching and controlling the supply of pressure oil to the front oil chamber and the rear oil chamber of 0 is installed.

Piston rod 1 of chuck cylinder 10
0a retracts to release the gripped state of the hollow bar B, and the supply of pressure oil to the vibrating mechanism 6 is stopped, and the hammer 6c of the vibrating mechanism 6 remains stationary. Is retracted from the advancing end to the retracting end together with the rectilinear member 3, the chuck valve 18 and the breaker valve 1
7 operates and the piston rod 1 of the chuck cylinder 10
0a moves forward, a part of the hollow bar B is gripped by the chuck mechanism 7 at a position rearward from the previous gripping position, the hammer 6c of the vibration mechanism 6 vibrates and the chuck mechanism 7 is repeatedly tapped, and the feed valve 16 is actuated, the piston rod 5a of the feed cylinder 5 and the rectilinear member 3 start to move forward, and the hollow rod B is repeatedly tapped through the chuck mechanism 7 while being pushed forward to push the hollow rod B to the feed cylinder 5
It is pushed into the ground G by the propulsive force that is a combination of the pushing force by the force and the vibration force by the striking action of the vibration mechanism 6. When the piston rod 5a of the feed cylinder 5 and the rectilinear member 3 advance from the retracted end to the advancing end, the hollow bar B is pushed into the ground G by a length corresponding to the advancing stroke of the rectilinear member 3.

When the piston rod 5a of the feed cylinder 5 advances to the advancing end, the chuck valve 18 and the breaker valve 17 are actuated again, the piston rod 10a of the chuck cylinder 10 retracts, and the hollow bar B is gripped. With the release of the pressure oil to the vibrating mechanism 6 stopped and the hammer 6c at rest, the feed valve 16 is actuated and the piston rod 5a of the feed cylinder 5 starts retreating, and the chuck mechanism 7 moves. The hollow rod B is released and the rectilinear member 3
Along with the receding end.

Each time the piston rod 5a of the feed cylinder 5 and the rectilinear member 3 move back and forth, the chuck mechanism 7 sequentially shifts the gripping position for gripping the hollow rod B to the rear position, and the hollow rod B is repeated by the vibrating mechanism 6. The pushing operation in which the hollow rod B is intermittently pushed forward while being beaten is repeated, and the hollow rod B is intermittently pushed into the ground G, so that almost the entire hollow rod B is removed.
It is buried in the ground G.

In the chemical liquid supply control mechanism provided for supplying the chemical liquid into the hollow rod B in synchronization with each pushing operation of the hollow rod B, the piston pump type pump 20 is provided on the outer surface of the guide member 2. The pumps 20 are mounted in parallel, a piston 20b is tightly fitted in the cylinder 20a of the pump 20 so as to be slidable in the axial direction, and a piston chamber 20c into which a chemical solution flows in and out is formed. Piston 20b
A base end portion of a piston rod 20d extending rearward is fixed to the rear end of the piston rod 20d. Are linked to.

Below the supporting portion 1a of the connecting bracket 1, a check valve unit 23 having a built-in chemical liquid flow path is suspended and tiltably supported. A supply / discharge pipe 24 is provided between the check valve unit 23 and the base end of the cylinder 20a of the pump 20, and a flexible pipe is provided between the check valve unit 23 and the rear end of the hollow bar B. A liquid supply pipe 25 is provided.
The liquid supply pipe 25 and the hollow rod B are connected by a joint that can be detached with one touch, and the base end portion of the liquid supply pipe 25 is attached to the case 23a of the check valve unit 23. It is connected to the. However, instead of this shutoff valve 27, a shutoff valve that can be switched between a fully closed state and a fully open state and a throttle mechanism capable of controlling the flow rate may be connected in series.

As shown in FIG. 4, the chemical liquid tank 26 is installed in the case 23a of the check valve unit 23, and the supply / discharge pipe 2 is installed in the case 23a of the check valve unit 23.
4 and the chemical solution tank 26 are connected to the first feed line 28.
A second feed conduit 29 connected to the supply / discharge pipe 24 and the shutoff valve 27, and a return conduit 30 connected to the first feed conduit 28 in a bypass shape are provided.

The chemical solution tank 2 is provided in the middle of the first feed line 28.
A first check valve 31 that blocks the backflow of the chemical solution to the 6 side is connected, and a second check valve 32 that blocks the backflow of the chemical solution to the pump 20 side is connected in the middle of the second feed pipe line 28. A relief valve 33 is connected in the middle of the return pipe 30 to allow only the excess chemical liquid to flow into the chemical liquid tank 26.

When the hollow bar B is pushed into the ground G to reinforce the ground, when the rectilinear member 3 advances and the hollow bar B is pushed forward, the piston rod 20 of the pump 20 is pushed.
d moves backward in association with the rectilinear member 3, the volume of the piston chamber 20c of the pump 20 is gradually reduced, and the chemical liquid is supplied from the piston chamber 20c to the supply / discharge pipe 24, the second feed pipe line 29, and the liquid supply liquid. It is sent into the hollow bar B through the pipe 25, and the rectilinear member 3
While the hollow rod B is being pushed into the ground G during the forward movement, the chemical liquid is discharged from the vicinity of the front end of the hollow rod B and fills the gap between the hollow rod B and the hole wall around it.

When one push of the hollow rod B is completed and the rectilinear member 3 moves backward with the hollow rod B left in the pushing position,
The piston rod 20d of the pump 20 moves rearward, the volume of the piston chamber 20c is gradually expanded, and the chemical liquid tank 2
The chemical liquid pumped from inside 6 is supplied into the piston chamber 20d through the first feed pipe line 28 and the supply / discharge pipe 24, the supply of the chemical liquid to the hollow rod B is stopped, and each time the rectilinear member 3 moves back and forth. The supply of the chemical liquid to the hollow rod B and the supply of the chemical liquid to the piston chamber 20d are repeated in synchronization with the advancing operation and the receding operation of the rectilinear member 3. The surplus chemical liquid of the chemical liquid supplied to the hollow rod B when the hollow rod B is pushed in after the flow rate is adjusted by the shutoff valve 27 is recovered into the chemical liquid tank 26 through the return line 30, and the hollow rod B A certain amount of drug solution is supplied.

After the ground reinforcement work is completed, the pump 2
0, the check valve unit 23, the supply / discharge pipe 24, the liquid supply pipe 25, and the like, when water is injected into the chemical liquid tank 26 and the pusher is idled, the pump 20 and the check valve unit 23 The chemical liquid therein is gradually discharged and replaced with water, and the entire chemical liquid supply control mechanism is washed. At the start of ground reinforcement work, the pump 20 is idled until the cylinder 20a is filled with the chemical solution.

The chemical liquid that has flowed into the hollow rod B while the rectilinear member 30 is moving is discharged from the discharge port near the front end of the hollow rod B pushed into the ground G, and the hollow rod B and its surroundings are discharged. When the entire length of the hollow rod B is pushed into the ground G, the chemical liquid is filled in the gaps with the hole walls in sequence, and the chemical liquid is filled in the gap around the hollow rod B in the ground G over the entire length thereof. Is cured around the hollow bar B after a predetermined time has elapsed. Each time the pushing of the hollow rod B is completed, the tip of the liquid supply pipe 25 is removed from the pushed hollow rod B and attached to the rear end of the hollow rod B to be pushed next time.

According to the above-described embodiment, the work of burying the hollow rod B in the ground G and the work of injecting the chemical liquid around the hollow rod B can be performed at the same time. Compared with the construction method, it is possible to greatly improve the efficiency, shorten the working time, reduce the equipment cost and labor cost, and shorten the reinforcing work period.

Further, gradually pushing the hollow bar B in the ground G by intermittently adding it propulsion against the hollow bar B by changing the gripping position of the chuck mechanism 7 grips the hollow bar B, Since the drug solution is injected at the same time during the embedding process,
It is possible to precisely inject and fill the liquid around the hollow rods B in the ground G, and to embed the hollow rods B in the ground G and the liquid around the hollow rods B. It is possible to stably and smoothly perform the combined work with the injection work. Also,
Since the chemical liquid is supplied to the hollow rod B only when the hollow rod B is moved forward, an appropriate amount of the chemical liquid can be constantly discharged from the hollow rod B, and the excessive injection of the chemical liquid into the ground G can be eliminated. Unlike the conventional method, which is different from the method of injecting the chemical liquid in the post-process after the rod is embedded, it is possible to eliminate the problem that the clogging due to the collapse of the hole wall causes uneven injection of the chemical liquid. It can be injected around the hollow bar B over its entire length without any unevenness. Furthermore, ground G
At the time of reinforcement, the chemical liquid injected around each hollow rod B embedded in the ground G enhances the adhesion between each hollow rod B and the ground G to increase the slip resistance of the hollow rod B. Thus, the soft ground G can be reinforced strongly and effectively, and the injected chemical liquid adheres to the outer peripheral surface of the hollow rod B to cover the outer peripheral surface of the hollow rod B with the chemical liquid. The anticorrosion effect on the embedded hollow rod B can be enhanced. Especially when the hollow bar B is pushed into the ground G
Each time the hollow bar B is pushed in, the hollow bar is discharged.
The part of B that was pushed in by one pushing operation and
Since the chemical solution is sequentially filled between the hole wall around the ground, the ground G
The gap between the hollow bar B pushed inside and the hole wall around it
Among them, the hollow bar B is pushed in by one pushing operation.
The appropriate amount of chemical solution to the gap of the length
Next, discharge and spread over the entire length in the gap between the hollow bar B and the hole wall.
Therefore, it is possible to fill the chemical solution in just right and left. Hollow bar B
The amount of chemicals to be filled around
It is possible to improve the adhesion effect between the ground and the hollow bar by injection.
it can.

Next, a second embodiment of the chemical liquid injector shown in FIG. 5 will be described. In the chemical liquid supply control mechanism, a pair of front and rear chain wheels 35 pivotally supported by the guide member 2,
A chain 36, which is connected to the rear projecting piece 3b of the rectilinear member 3 and circulates and rotates in conjunction with the forward / backward movement of the rectilinear member 3, is mounted on the guide member 35, while the rotary pump 20A is mounted on the guide member 2. Attached to the input shaft of the pump 20A is a chain wheel provided with a one-way clutch or the like that rotates only to one side, and the chain wheel 3 adjacent to the chain wheel and the front chain wheel 35 is attached.
A chain 38 for hanging the pump 20A in rotation with the pump 7 is interlocked with the pump 7.

On the lower surface of the guide member 2, the chemical liquid tank 2 is provided.
6A is attached, and the base end of the liquid supply pipe 25A, whose tip is connected to the rear end of the hollow rod B, is connected to the chemical liquid tank 26A via a flow rate adjusting valve 27A. A discharge pipe 39 and a suction pipe 40 are provided between the pump 20A and the chemical liquid tank 26A, and a portion of the suction pipe 40 inserted into the chemical liquid tank 26A is formed of a flexible hose. A weight is attached to the tip of the hose so that the inlet of the suction pipe 40 always sinks below the liquid surface of the chemical liquid in the chemical liquid tank 26A.

When the rectilinear member 3 advances, the pump 20A is rotatably driven by the chain 38 and the chemical liquid tank 26A.
The chemical solution inside is supplied into the hollow bar B through the supply pipe 25A, and when the rectilinear member 3 retracts, the sprocket wheel attached to the input shaft of the pump 20A idles and the supply of the chemical solution to the hollow bar B is stopped. To do.

Next, a third embodiment of the chemical liquid injector shown in FIGS. 6 and 7 will be described. In this example, in the chemical liquid supply control mechanism, the box 42a of the hand cart 42 that is movably installed outside the pushing machine. A pump 20B driven by an engine 50 is provided inside, and a chemical liquid tank 26B is provided above the pump 20B, while the pump 20B is provided.
An on-off valve 43 fixed to the guide member 2 is connected in the middle of a flexible liquid supply pipe 25B that is piped between the discharge side of and the rear end of the hollow rod B. The on-off valve 43 is operation-controlled by an electric signal for changing the moving direction of the piston rod 5a of the feed cylinder 5, that is, an electric signal for operating the feed valve 18.

When the forward movement signal for starting the forward movement of the piston rod 5a of the feed cylinder 5 and the rectilinear member 3 is transmitted,
When the internal flow path of the open / close valve 43 is opened and the chemical liquid is supplied into the hollow rod B through the liquid supply pipe 25B, and the piston rod 5a of the feed cylinder 5 and the rectilinear member 3 start the backward movement, the opening / closing The internal flow path of the valve 43 is closed and the hollow bar B
The supply of the chemical solution to the

Next, a fourth embodiment of the chemical liquid injector shown in FIG. 8 will be described. In this embodiment, the front dog 44 and the rear dog 45 are respectively suspended at the front and rear ends of the lower surface of the rectilinear member 3. On the other hand, the valve element of the opening / closing valve 46 attached to the guide member 2 is converted into a backward tilted posture and a forward tilted posture to open and close the internal flow path of the opening / closing valve 46.
The structure is similar to that of the third embodiment except that is connected.

When the rectilinear member 3 retreats to the retracted end, the front dog 44 abuts on the tactile piece 47 in the forward tilted posture, and the tactile piece 47.
Is changed to a backward tilted posture, the internal flow path of the on-off valve 46 is opened, and the chemical liquid is supplied with the chemical liquid in synchronization with the forward movement of the rectilinear member 3.
It is supplied into the hollow bar B through 5c. When the rectilinear member 3 advances to the advancing end, the rear dog 45 hits the tactile piece 47 in the rearward tilted posture, the posture of the tactile piece 47 is converted to the forward tilted posture, and the internal flow path of the on-off valve 46 is closed. The supply of the chemical solution to the hollow rod B is stopped.

In the fifth embodiment of the chemical liquid injector, the drive oil passage connected to the rear oil chamber of the feed cylinder 5 from the valve body of the on-off valve (not shown) attached to the guide member 2 and the feed cylinder 5 are provided. The outside configured to open and close the internal passage of the on-off valve by operating and returning by the pressure oil of the two pilot oil passages respectively connected to the return oil passage connected to the front oil chamber. Is constructed similarly to the third embodiment.

Since the other operations and effects of the second to fifth embodiments are almost the same as those of the first embodiment, the description thereof will be omitted.

[Brief description of drawings]

FIG. 1 is a side view of a ground reinforcement bar pushing machine showing a first embodiment of a chemical liquid injector.

FIG. 2 is a plan view of the same.

FIG. 3 is a side view illustrating a chemical liquid injection method for ground reinforcement work by the chemical liquid injection device of the first embodiment.

FIG. 4 is a piping diagram of a check valve unit of a chemical liquid supply control mechanism.

FIG. 5 is a side view showing a second embodiment of the chemical liquid injector.

FIG. 6 is a side view of essential parts showing a third embodiment of the chemical liquid injector.

FIG. 7 is a side view illustrating a chemical liquid injection method for ground reinforcement work by the chemical liquid injection device of the third embodiment.

FIG. 8 is a side view of essential parts showing a fourth embodiment of the chemical liquid injector.

[Explanation of symbols]

 3 Straight advancing member 5 Feed cylinder 6 Vibration mechanism 7 Chuck mechanism 20, 20A, 20B Pump 25, 25A, 25B, 25C Liquid supply pipe B Hollow rod

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Ikuo Ito Ikuo Ito 3-4-19, Atsuta-ku, Nagoya, Aichi Prefecture Teisaku Co., Ltd. (72) Hiro Hiroshi Ito 2-8-25 Shin-Kagashi, Itabashi-ku, Tokyo In Okada-Ayon Co., Ltd. (72) Inventor Moriji Takeda 4-1-1-18 Kaigan-dori, Minato-ku, Osaka-shi, Osaka Inside Okada-Ayon Co., Ltd. (72) Toshio Ogoshi 4-1-1-18 Kaigan-dori, Minato-ku, Osaka, Osaka Issued by Okada Ayon Co., Ltd. (56) Reference JP-A-60-184124 (JP, A) JP-A-47-14908 (JP, A)

Claims (2)

(57) [Claims] 1. A rectilinear section which is drive-controlled forward and backward.
The chucking mechanism mounted on the material sequentially shifts the gripping position for gripping the hollow reinforcing bar to the rear position to intermittently push the hollow bar to the front, and the rectilinear member.
A vibration mechanism which is mounted on the chuck rod and moves together with the chuck mechanism to transmit the hollow rod material to the hollow rod material through the chuck mechanism at each time of pushing the hollow rod material by a combined propulsive force. while repeated continuously pushing pushing the actual operation to, you said chuck mechanism in the straight-moving member moves forward
Preliminary the vibrating mechanism a chemical for ground reinforcement is discharged from the vicinity of the front end of the hollow rod is supplied from the rear end to the hollow bar in the chemical liquid supply mechanism when the propel the hollow rod, wherein
The chuck mechanism releases the hollow bar and the rectilinear member retracts.
When stopping, the supply of chemical liquid to the hollow bar is stopped and the hollow bar is
It is possible to repeat the intermittent chemical solution discharge operation synchronized with the intermittent push-in operation to the hollow bar material that is almost entirely embedded in the ground and to fill the entire clearance between the hole wall around it with the chemical solution. The characteristic method is the chemical injection method for ground reinforcement work. 2. A straight advancing member, which is installed on a laterally long guide member so as to be able to move straight in the longitudinal direction thereof, and a feed mechanism for advancing and retracting the rectilinear member in the longitudinal direction of the guide member, are connected, The rectilinear member includes a chuck mechanism for gripping a part of the ground reinforcing hollow bar material pushed into the ground by changing its gripping position, and a hollow bar member through the chuck mechanism when the rectilinear member advances. In a ground reinforcement bar pushing machine equipped with a vibration mechanism that transmits vibration force, the hollow bar was embedded in the ground by being connected to the rear end of the hollow bar pushed into the ground. A flexible liquid feed pipe that is later removed from the hollow rod, and a chemical liquid for ground reinforcement is fed into the hollow rod through the liquid feed pipe when the rectilinear member advances together with the hollow rod. Discharge from near the front end of the hollow bar and the chuck mechanism When the hollow rod is released and the rectilinear member retracts, the supply of the chemical solution to the hollow rod is stopped ,
Intermittent with the intermittent pushing motion of the empty bar
A chemical injection device characterized by comprising a chemical supply control mechanism for repeating a chemical discharge operation .