JPS5820658Y2 - Reverse entry prevention structure for drilling hole in chemical injection device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a structure for preventing the entry of a trench opening in a chemical injection device for ground improvement, which improves soil by poling into the target ground and delivering an injector to inject chemical liquid. The aim is to provide extremely large benefits in use.

An example of implementation of the present invention will be described in detail below based on the drawings.

The outer pipe 1 of the device that communicates with the excavation equipment and the chemical supply equipment (both not shown) may be a single pipe or a double pipe with an outer pipe 5 and an inner pipe 6 as shown in the drawing, and the outer pipe 1 may be a double pipe with an outer pipe 5 and an inner pipe 6 as shown in the drawing. An internal medicinal solution passage a for one medicinal solution B1 and an external medicinal solution passage a for the other medicinal solution B2, which have the property of doing so, are divided into double inner and outer sections.

An injection body 2 is housed in the inner tube 6 so as to be able to move forward and backward so that it can be delivered to the tip of the excavation opening d by the pressure of feeding the chemical solution B1.

In addition, the inner tube 6 has a rear valve hole 7 which communicates with both chemical liquid passages a and l) at the rear of the bottom surface of the injector 2 when it is delivered to the front position, and a through hole 9 which will be described later of the injector 2. The front valve hole 8 is opened in a predetermined positional relationship.

The front and rear valve holes 7 and 8 are such that when the injector 2 is completely delivered, the rear valve hole 7 is opened and the liquid medicine B1 is mixed with the liquid medicine B2 in the external liquid passage, and then the mixed liquid B is passed through the front valve hole 8. It is formed so that it can flow into the injection body 2 through the through hole 9 and seep into the ground G through the flow space S from the outflow hole 11.

In addition, when the injector 2 is retracted, the front and rear valve holes 7, 8 are connected to the inner surface 3 of the grooved part 10, which is removably screwed to the inner tube 6 and the outer tube 1, because they are used as external drug liquid passages when the injector 2 is retracted. It also serves as a communication hole for the cooling water A that passes through the passage C formed in the gap with the body 2 and reaches the excavation opening d.

On the side of the exterior body 1 in this passage C, there is a trench 1 as shown in the drawing.
A ring-shaped check valve 4 is provided on the inner surface 3 of the injection molding device 0 so as to be in contact with the front peripheral surface of the injection rod portion 2a of the injection body 2 located at the rear position.

The ring-shaped check valve 4 is a reducer that constitutes the excavated portion 10.
10a and a metal crown 10b, the check valve 4 can be freely separated by unscrewing the metal crown 10b.

Also, the check valve 4 has a reducer 10a and a metal crown 1.
The metal ring part 4a is directly sandwiched between the metal ring part 4a and the synthetic rubber ring valve part 4b which is integrally fixed to the metal ring part 4a.

The valve part 4b is formed so that its tip is inclined toward the excavation opening d, and the wall gradually becomes thinner from the proximal end to the distal end. The water pressure of the cooling water A, which is pumped along with the flow, causes the opening to open and allow the water to pass through to the blade 12, while foreign matter such as earth and sand entering from the excavation opening d is blocked by the pressure on the circumferential surface of the injection rod portion 2a. Formed to allow close movement.

Since the present invention is configured as described above, it is possible to stably supply sufficient cooling water to the blade through the check valve, eliminating the possibility of inability to perform rough cutting due to seizure or other reasons. Ta.

It also prevents foreign objects such as earth and sand from entering the passage through the excavation opening, completely preventing the cooling water passage from being blocked by earth and sand, and ensuring a predetermined amount of cooling water. Met.

Furthermore, the check valve was designed to scrape off and remove the medicinal liquid on the circumferential surface of the injection body as it retreated after injection, thereby maintaining the valve function and ensuring smooth forward and backward movement of the injection body.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view showing an embodiment of the present invention, showing a polling state. FIG. 2 is a longitudinal sectional front view showing the injection state of the chemical liquid. FIG. 3 is a cross-sectional view taken along line III-III. FIG. 4 is an enlarged front view of the main parts and is a sectional view. FIG. 5 is an enlarged perspective view of the check valve. In the figure, 1 is the exterior body, 2 is the injection body, 3 is the inner surface of the exterior body 1, 4 is the ring-shaped check valve, A is the cooling water, B is the chemical solution, C is the passage, and d is the excavation port.

Claims (1)

[Scope of utility model registration request] In a chemical liquid injection device in which an injection body is housed in an exterior body so as to be freely drawn out, and a cooling water passage leading to a drilling opening is formed in a gap between the injection body and the inner surface of the exterior body facing the opposite side, a passageway for cooling water is formed on the exterior body side of the passage. This is a structure for preventing the entry of the excavation port, which is provided with a ring-shaped check valve that is inclined toward the excavation port and elastically contacts the circumferential surface of the injector tip.