JPH0679898U - Valve for injection of cement milk - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] Regarding the cement milk injection valve, when injecting cement milk, it is possible to prevent the exhaust passage from being closed by the balls in the exhaust passage, so that the injection work can be performed quickly. Provide a valve for injection. A valve having a tapered cement milk injection passage 25 and an exhaust passage 27 which are fitted to the rear end of the drilling pipe 9 and balls 29, 31 for opening and closing the passage are arranged in each passage. The main body 17 and the inlets 25a, 47 and the outlets 27a, which are engaged with the valve main body 17 and correspond to the respective passages,
An injection mouthpiece 19 in which 49 is formed and a cement milk injection hose 53 is connected to the injection mouth, and a cap 21 for fixing the valve body 17 to the rear end of the drill pipe 9 via the injection mouthpiece 19. In the valve, the ball pressing rod 5 that holds the ball 31 in the exhaust passage 27 in an open state
5 was inserted from the air outlet 49 of the injection mouthpiece 19, and the ball pressing rod 55 was detachably attached to the injection mouthpiece 19 by the magnet 59.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 INDUSTRIAL APPLICABILITY The present invention is a cement milk injection valve used for constructing an arched lining body along the tunnel cross section in front of a facet before excavation of a tunnel or a tunnel in excavation work of a tunnel or an underground tunnel. Regarding

[0002]

[Prior art]

 Conventionally, in the excavation work of a tunnel, an excavation method for stabilizing the cutting face has been widely used by constructing an arched lining body with concrete or the like in front of the cutting face along the tunnel cross section before excavating the tunnel. It is used.

In this excavation method, as shown in FIG. 4, a boring machine 7 is mounted on a boom 5 supported on a self-propelled base 3 via a stand 1, and a boring pipe of the boring machine 7 is installed. In Fig. 5, after drilling a number of holes in the peripheral part B of the ground A for excavation as shown in Fig. 5 slightly upward in the advancing direction of the excavation, cement milk is injected into the hole using the drilling pipe 9 used for drilling Then, as shown in FIG. 6, a columnar hardened layer 11 made of cement milk is successively formed along the periphery of the opening of the tunnel to construct an arch-shaped lining body 13. While protecting the roof, the ground A to be excavated inside the pit is excavated within the range of the length of the lining 13 or less. The drilled pipe 9 is left in the hole as a reinforcing core material for the cylindrical hardened layer 11.

FIG. 7 is a front view of an injection valve used when cement milk is injected, and FIG. 8 is a cross-sectional view of the injection valve. When the drill pipe 9 is used as an injection pipe, Since the cement milk is injected from the rear end side, it is necessary to discharge the air in the hole. Then, when injecting cement milk, such an injection valve 15 is mounted on the rear end side of the hole-drilling pipe 9.

In FIGS. 7 and 8, 17 is a plastic valve body fitted to the rear end 9 a of the hole-drilling pipe 9, 19 is an injection mouthpiece engaged with the rear end side of the valve body 17, Reference numeral 21 denotes a ring-shaped cap that is screwed onto the outer circumference of the drilling pipe 9 to fix the valve body 17 and the injection mouthpiece 19 to the drilling pipe 9, and the valve body 17 has the same outer diameter as the inner diameter of the drilling pipe 9. A flange 23, which is formed to a size and which engages with the rear end 9a of the drilled pipe 9, is provided as a stopper on the rear end side.

Further, in the valve body 17, a tapered cement milk injection passage 25 and an exhaust passage 27 are formed in the axial direction of the drilling pipe 9 so as to sequentially expand from the rear end side to the front end side. Balls 29 and 31 functioning as opening / closing valves of the respective passages are arranged in 25 and 27, respectively.

In order to prevent the balls 29 from falling, the injection port 25a of the cement milk injection passage 25 is made smaller in diameter than the outer diameter of the balls 29, and in the passage 25, the balls 29 from the injection outlet 25b are introduced. A small-diameter portion 25c is provided to prevent the falling.

Similarly, the outlet 27 a of the exhaust passage 27 opening to the rear end side of the valve body 17 has a smaller diameter than the outer diameter of the ball 31, and the passage 27 has a bore from the inlet 27 b. A small diameter portion 27c that prevents the roll 31 from falling is provided. Further, a spring 33 is arranged in the exhaust passage 27, and when the cement milk is injected, the spring 33 biases the ball 31 toward the small diameter portion 27c to keep the exhaust passage 27 open. The air in the holes can be discharged to the outside from the exhaust passage 27. The spring 33 is set to a length such that the ball 31 does not contact the small diameter portion 27c and block the exhaust passage 27.

Further, on the tip end side of the valve body 17, there are provided cylindrical projecting portions 35 and 37 in which the cement milk injection passage 25 and the exhaust passage 27 are respectively opened, and the projecting portion on the exhaust passage 27 side is provided. One end of an exhaust hose 39 arranged inside the drilled pipe 9 is connected to 37. Further, the exhaust hose 39 is set to have a length such that the tip thereof reaches the vicinity of the tip of the drilled pipe 9.

On the other hand, on the rear end side of the valve body 17, a recess 41 is formed around the inlet 25a and the outlet 27a, and protrusions 43 and 45 for opening the inlet 25a and the outlet 27a are formed. The protrusions 43 and 45 are respectively inserted into the cement milk inlet 47 and the air outlet 49 provided in the inlet metal 19, and the inlet metal 19 is engaged with the rear end of the valve body 17. .

Further, a cylindrical hose connecting portion 51 having the mounting hole 47 opened is projected from the injection mouthpiece 19, and a cement milk injection hose 53 connected to the hose connecting portion 51 is used. The cement milk is introduced into the bored pipe 9 through the cement milk injection passage 25.

The conventional injection valve 15 has such a structure, and the air in the hole is exhausted from the exhaust passage 27 through the exhaust hose 39 as cement milk is injected. When the injected cement milk reaches the tip of the drilling pipe 9 and flows out of the exhaust passage 27 through the exhaust hose 39, the inside of the drilling pipe 9 is filled with cement milk, and the spring force of the spring 33 increases. On the other hand, the cement milk moves the ball 31 in the direction of the arrow C to close the exhaust passage 27 with the ball 31, so that in this state, the injection pressure is further increased to inject the cement milk into the drilled pipe 9, Cement milk may be osmotically injected into the. Simultaneously with the completion of the injection, the cement milk moves the ball 29 in the direction of arrow C to block the cement milk injection passage 25.

[0013]

[Problems to be solved by the device]

 However, as mentioned above, when drilling the ground in the direction of the excavation of the pit, the hole is drilled slightly upward, so when the cement milk is injected, the injection valve 15 should also be slightly tilted at its tip side. It will be attached to the rear end of the drilled pipe 9.

Therefore, at the time of injecting cement milk, the ball 31 in the exhaust passage 27 may move in the direction of arrow C by its own weight against the spring force of the spring 33 to block the exhaust passage 27, It was pointed out that cement milk could not be injected reliably.

Although not shown, a means for holding the ball 31 at a fixed position by inserting a ball pressing rod into the exhaust passage 27 from the outlet 49 of the injection mouthpiece 19 in place of the spring 33 is also provided. Although it has been used, conventionally, there was no means to fix such a ball pressing rod, so the ball pressing rod would come off due to the weight of the ball 31 and the outflow pressure of cement milk due to the exhaust, and as a result, In addition, the ball 31 has a drawback that it blocks the exhaust passage 27.

The present invention has been devised in view of such a situation, and when the cement milk is injected, it is possible to prevent the inside of the exhaust passage from being closed by a ball so that the cement milk injection work can be performed quickly and reliably. It is an object of the present invention to provide a valve for injecting cement milk which can be used.

[0017]

[Means for Solving the Problems]

 In order to achieve such an object, the present invention fits at the rear end of the drilling pipe, and the tapered cement milk injection passage and the exhaust passage are formed in the axial direction of the drilling pipe, and The valve body with the ball for opening and closing the passage is engaged with the valve body, the cement milk inlet and the air outlet corresponding to the cement milk inlet passage and the exhaust passage are formed, and the cement milk inlet is In the cement milk injection valve, which comprises an injection mouthpiece to which the cement milk injection hose is connected, and an annular cap for fixing the valve body to the rear end of the drill pipe through the injection mouthpiece, the exhaust passage A ball pressing rod for holding the ball in the passage open state was inserted therein from the air outlet of the inlet, and the ball pressing rod was detachably attached to the inlet through a magnet.

[0018]

[Action]

 According to the present invention, when the cement milk is injected, the air in the hole is exhausted from the exhaust passage, but at this time, since the ball in the exhaust passage is held in the open state by the ball pressing rod, The air in the holes will be smoothly exhausted through the exhaust passage.

Then, when the injected cement milk reaches the tip of the drilled pipe and flows out from the exhaust passage through the exhaust hose connected to the valve body, the drilled pipe is filled with the cement milk. When the worker pulls out the ball pressing rod, the magnet is separated from the inlet metal and the ball pressing rod is pulled out from the exhaust passage.

When the ball pressing rod is pulled out in this way, the balls move by the cement milk and block the exhaust passage. Therefore, in this state, the injection pressure is further increased and the cement milk is introduced into the drilled pipe. It can be injected and cement milk is osmotically injected into the ground.

Then, as in the conventional case, at the same time as the injection is completed, the cement milk moves in the ball to block the cement milk injection passage.

[0022]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Since the configuration excluding the devised portion is similar to that of the injection valve shown in FIGS. 7 and 8, a description thereof will be omitted here and only the devised portion will be described. The same parts as those in the above-mentioned conventional example are indicated by the same reference numerals.

FIG. 1 is a front view of an injection valve according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line II-II thereof, in which 55 is an injection port 19 and an outlet of the valve body 17. 49, 27 a is a ball pressing rod inserted into the exhaust passage 27, a magnet 59 is attached to the ball pressing rod 55 via a support rod 57, and the magnet 59 is attracted to the injection base 19. By doing so, the ball pressing rod 55 holds the ball 31 in the exhaust passage 27 on the side of the small diameter portion 27c to open the exhaust passage 27. Also, a ring 61 is attached to the other end of the ball pressing rod 55, and if the operator puts his finger on the ring 61 and pulls it in the direction of the arrow as shown in FIG. The pressing rod 55 can be pulled out from the exhaust passage 27.

By pulling out the ball pressing rod 55 from the exhaust passage 27 in this way, the ball 31 can freely move in the exhaust passage 27. Since the injection valve 63 according to the present embodiment is configured as described above, in order to inject the cement milk into the drilled pipe 9 using the injection valve 63, first, the exhaust hose 39 is connected. The exhaust hose 39 is connected to the protrusion 37 of the valve body 17, and the exhaust hose 39 is inserted into the drilled pipe 9 to fit the valve body 17 to the rear end 9 a of the drilled pipe 9.

Next, the inlet 47 and the outlet 49 of the inlet 19 are inserted into the protrusions 43 and 45 of the valve body 17, respectively, and the inlet 19 is engaged with the rear end of the valve body 17 to form a hole. A cap 21 is screwed onto the outer circumference of the pipe 9 to fix the valve body 17 and the injection mouthpiece 19 to the drilled pipe 9.

Then, the cement milk injecting hose 53 may be connected to the hose connecting portion 51 of the injection mouthpiece 19 to inject the cement milk into the boring pipe 9. With the injection of cement milk, the air in the hole is exhausted from the exhaust passage 27 via the exhaust hose 39. At this time, the balls 31 in the exhaust passage 27 are moved toward the small diameter portion 27c side as shown in FIG. Since it is held and the exhaust passage 27 is opened, the air in the hole is smoothly exhausted through the exhaust passage 27.

When the injected cement milk reaches the tip of the drilling pipe 9 and flows out of the exhaust passage 27 through the exhaust hose 39, the inside of the drilling pipe 9 is filled with the cement milk. When a person hooks his finger on the ring 61 of the ball pressing rod 55 and pulls it in the direction of the arrow as shown in FIG. 3, the magnet 59 separates from the inlet 19 and the ball pressing rod 55 is pulled out from the exhaust passage 27.

Thus, when the ball pressing rod 55 is pulled out in this way, the balls 31 are moved by cement milk from the state shown by the two-dot chain line to the position shown by the solid line, and the exhaust passage 27 is closed. In this state, the injection pressure may be further increased to inject the cement milk into the drilled pipe 9, and the cement milk may be osmotically injected into the ground.

Then, as in the conventional case, at the same time as the injection is completed, the cement milk moves in the ball 29 in the arrow direction, and the cement milk injection passage 25 is closed. As described above, in this embodiment, the ball pressing rod 55 that holds the ball 31 in the open state is inserted into the exhaust passage 27 from the outlet 49 of the injection mouthpiece 19, and the ball pressing rod 55 is magnetized. Since it is detachably attached to the injection mouthpiece 19 via 59, according to the present embodiment, the ball 31 in the exhaust passage 27 is kept in contact with the ball pressing rod 55 until the hole forming pipe 9 is filled with the cement milk. This will keep the passage open.

Therefore, at the time of injecting cement milk, even if the injection valve 63 is attached to the rear end of the drilling pipe 9 in a slightly inclined state, the ball 31 prevents the exhaust passage 27 from being closed by the balls 31 at the time of injecting the cement milk. As a result, cement milk can be injected more quickly and more reliably than before, and the lining body can be constructed smoothly.

[0031]

[Effect of device]

 As described above, according to the present invention, prior to excavation of a tunnel or the like, in constructing a lining body by providing a cylindrical hardened layer of concrete along the tunnel cross section in front of the face, it is possible to construct Milk injection work can be performed quickly and surely, and the lining body can be constructed smoothly.

[Brief description of drawings]

FIG. 1 is a front view of an injection valve according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a sectional view of the injection valve showing a state in which a ball pressing rod is removed.

FIG. 4 is a side view of a drilling device used for tunnel excavation work.

FIG. 5 is a cross-sectional view of the tunnel.

FIG. 6 is a cross-sectional view of the tunnel showing the construction status.

FIG. 7 is a front view of a conventional injection valve.

8 is a sectional view taken along line VIII-VIII of FIG.

[Explanation of symbols]

 9 Drilling pipe 17 Valve body 19 Inlet gold 21 Cap 25 Cement milk injecting passage 25a, 47 Inlet 25b Inlet 27 Exhaust passage 27a, 49 Outlet 27b Inlet 29, 31 Ball 39 Exhaust hose 53 Cement milk injecting hose 55 Ball Pressing bar 59 Magnet

Claims (1)

[Scope of utility model registration request] 1. A tapered cement milk injection passage and an exhaust passage are formed in the axial direction of the drilling pipe and are fitted in the rear end of the drilling pipe, and a ball for opening and closing the passage is arranged in each passage. And a valve body for engaging with the valve body, the cement milk inlet and the air outlet corresponding to the cement milk inlet passage and the exhaust passage are formed, and the cement milk inlet hose is connected to the cement milk inlet. In a cement milk injection valve consisting of an inlet metal and an annular cap for fixing the valve body to the rear end of the drilled pipe via the inlet metal, the ball is opened in the exhaust passage. A cement milk injection valve characterized in that a ball pressing rod to be held is inserted from an air outlet of an injection mouthpiece, and the ball pressing rod is detachably attached to the injection mouthpiece via a magnet.