JP2566179B2 - Blocking device for the rapid hardening agent discharge port in a mixing and stirring device for concrete hardening agents - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for preventing blockage of a rapid-hardening agent discharge port provided in a concrete and rapid-hardening agent stirring / mixing pipe portion in a tunnel lining concrete placing device or the like.

[0002]

2. Description of the Related Art When a rapid-hardening concrete is manufactured while being pumped by a concrete pump, it is connected to a concrete pumping pipe a as shown in Japanese Patent Application No. 2-47006 proposed by the present inventors. A rapid-hardening agent injecting device c is mounted on the concrete rapid-hardening agent addition stirring and mixing tube b, and while the rapid-hardening agent is added and mixed by the device c,
In order to prevent the mortar and slag in the concrete from flowing into the injection port of the quick-hardening agent in the device c so as to be clogged, connect the compression air pipe e to the quick-hardening agent addition pipe d and blow the pressure air. A mixing stirrer for the constructed concrete rapid hardening agent is applied. (See FIGS. 4 and 5) In the figures, f is a rotary shaft on which the stirring blade g is mounted, and h is a drive motor for the rotary shaft f.

[0003]

In this case, the rapid hardening agent is diffused by the mixing of air, and the action thereof causes a part of the rapid hardening agent to be mixed into the concrete in the form of bubbles.
For this reason, there is a problem that air bubbles frequently occur in the concrete to lower the hardening strength, and the rapid hardening agent cannot be uniformly added and mixed in the concrete.

The present invention has been proposed in view of the above problems of the prior art. The object of the present invention is to prevent clogging of the rapid hardening agent discharge port with a simple structure without lowering the strength of concrete. Another object of the present invention is to provide a device for preventing clogging of a rapid hardening agent discharge port in a mixing and stirring device for a concrete hardening agent.

[0005]

In order to achieve the above-mentioned object, a device for preventing blockage of a rapid hardening agent discharge port according to the present invention is mounted on a concrete rapid hardening agent addition stirring mixing pipe connected to a concrete pressure feeding pipe. In the rapid hardening agent injection cylinder, a valve rod guide passage having a narrowed cross-section whose tip communicates with the rapid hardening agent discharge port of the stirring and mixing tube and a proximal end of the passage, and a rapid hardening agent pressure feeding pipe. Is provided with a tubular cavity, and the valve rod of the on-off valve of the rapid hardening agent discharge port installed in the injection cylinder is inserted into the guide passage so as to be movable back and forth, and at the base end of the valve rod. The valve body is slidably fitted in the hollow cavity, and an ammunition is interposed between the bottom of the hollow cavity and the valve body.

[0006]

Since the present invention is constructed as described above,
Before the concrete pressure-feeding work is started, the valve rod of the on-off valve installed in the rapid-hardening agent injecting cylinder has a valve body at the base end of the valve rod and the bottom of a cylindrical cavity provided at the base end of the injecting cylinder. By the urging force of an ammunition machine interposed between and, the rapid hardening agent discharge port provided in the concrete rapid hardening agent addition agitating mixing pipe that protrudes through the valve rod guide passage provided in the injection cylinder is closed.

When the concrete pumping work is started,
Inside the rapid-hardening agent injection cylinder, the on-off valve resists the biasing force of the ammunition by the pressure of the rapid-hardening agent injected through the rapid-hardening agent pressure-feeding tube into the tubular cavity of the rapid-hardening agent injection tube. The discharge port is opened and the rapid hardening agent is added into the stirring and mixing tube. At this time, since the cross section of the valve rod guide passage has a narrowed small cross section, the flow velocity is increased and the solid matter attached to the discharge port is removed.

When the work is interrupted, the pressure applied to the on-off valve is removed, so that the on-off valve is pressed by the urging force of the ammunition, and the valve rod enters the discharge port to close the discharge port. To do.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in FIGS. Reference numeral 1 is a concrete rapid-hardening agent-added stirring and mixing pipe connected to a concrete pressure-feeding pipe, and a rapid-hardening agent injection cylinder 3 connected to a rapid-hardening agent discharge port 2 provided in the stirring and mixing pipe 1 is mounted. The injection cylinder 3 is provided with a valve rod guide passage 4 having a narrowed cross-section, the distal end of which communicates with the discharge port 2, and a cylindrical cavity 5 which communicates with the passage 4. The hardener pressure-feeding pipe 6 is connected.

Reference numeral 7 is an opening / closing valve of the rapid hardening agent discharge port 2 installed in the injection cylinder 3. The valve rod 7a of the opening / closing valve 7 is inserted into the guide passage 4 so as to be movable back and forth. Valve body 7 at the end
b is slidably fitted in the cavity 5 and each mounting portion provided on the facing surface of the valve body 7b and the lid piece 8 screwed to the injection tube 3 at the bottom of the cavity 5 An ammunition machine 10 is interposed between the ammunition machine 9 and the on-off valve 7, and the opening / closing valve 7 is pressed by the urging force of the ammunition machine 10, and the valve rod 7a closes the rapid hardening agent discharge port 2. The biasing force of the ammunition machine 10 can be adjusted by screwing the lid cantilever 8 with respect to the injection tube 3.

In the drawing, 11 is provided on the valve rod 7b, and the valve rod 7b
A valve rod guide for moving b in parallel with the tube axis of the injection pipe 3, a pressing pad for preventing leakage of the rapid hardening agent from the lid piece 8, and an O ring mounted on the valve body 7b. Is. Since the illustrated embodiment is configured as described above, before the concrete pressure-feeding work is started, the opening / closing valve 7 installed in the rapid-hardening agent injection cylinder 3 is pressed by the urging force of the ammunition machine 10, and the start is started. The valve rod 7a of the valve 7 penetrates and protrudes through the valve rod guide passage 4 provided in the injection cylinder 3, and closes the rapid hardening agent discharge port 2 provided in the concrete rapid hardening agent addition stirring and mixing tube 1.

When the concrete pumping operation is started, the pressure of the concrete quenching agent injected through the quenching agent pressure-feeding pipe 6 into the cylindrical cavity 5 of the quenching agent injecting cylinder 3 causes The start valve 7 withdraws into the rapid hardening agent injection cylinder 3 against the urging force of the ammunition 10, the discharge port 2 is opened, and the rapid hardening agent is added into the stirring and mixing tube 1. At this time, since the valve rod guide passage 4 has a narrow cross section,
The flow velocity is increased, and the solid matter attached to the discharge port 2 is removed.

When the work is interrupted, the pressure applied by the concrete hardening agent to the on-off valve 7 is released, so that the on-off valve 7 is pressed by the urging force of the bullet 10 and the valve rod 7
a enters the discharge port 2 and closes the discharge port 2 to prevent mortar and slag from flowing into the discharge port 2 from flowing into the discharge port 2 and to prevent the conventional method of blocking the discharge port 2 by air. If possible, it is possible to add and mix the rapid-hardening agent after the work is resumed.

[0014]

As described above, according to the device for preventing the closure of the rapid hardening agent discharge in the mixing and stirring apparatus for the concrete hardening agent according to the present invention, after the work is resumed without using the conventional means for preventing the obstruction by air. Since the rapid hardening agent can be added and mixed, mechanical equipment such as an air compressor is not required, and the configuration is significantly simplified.Because the air system is not used, there is a fear that the strength of concrete will deteriorate due to air mixing. Disappear.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing one embodiment of a device for preventing the closure of a rapid hardening agent discharge port in a concrete rapid hardening agent mixing and stirring apparatus according to the present invention.

FIG. 2 is an arrow view of FIG.

FIG. 3 is a perspective view taken along the arrow in FIG.

FIG. 4 is a partially longitudinal side view showing a conventional mixing and stirring device for a concrete rapid hardening agent.

5 is a view from the arrow of FIG.

[Explanation of symbols]

 1 Mixing Mixing Tube for Concrete Hardening Agent 2 Rapid Hardening Agent Discharge Port 3 Rapid Hardening Agent Injection Cylinder 4 Valve Rod Guide Passage 5 Cylindrical Hollow 6 Rapid Hardening Agent Pressure Feeding Pipe 7 Opening Valve 7a Valve Rod 7b Valve Body 10 Ammo

Claims (1)

(57) [Claims] 1. A cross-section of which a tip communicates with a rapid-hardening agent discharge port of the stirring-mixing pipe is narrowed in a rapid-hardening agent injection cylinder mounted on a concrete rapid-hardening agent-adding stirring-mixing pipe connected to a concrete pressure-feeding pipe. And a valve cavity for communicating with the proximal end of the passage and a cylindrical cavity connected to the rapid-hardening agent pressure-feeding pipe, and the valve for opening and closing the rapid-hardening agent discharge port provided in the injection cylinder. Of the valve rod is inserted into the guide passage so as to be able to move back and forth, and the valve body at the base end of the valve rod is slidably fitted in the tubular cavity, and the bottom of the recessed cavity and the valve body. A device for preventing blockage of a rapid hardening agent discharge port in a mixing and stirring device for concrete rapid hardening agent, characterized in that an ammunition is interposed between and.