JPH079090B2 - Ground improvement device with bypass pipe or T-shaped pipe containing steel balls - Google Patents

Description

TECHNICAL FIELD The present invention relates to a control valve used at the tip of a boring rod in a ground improvement method for injecting a hardening material into the ground, and a method of using the control valve.

[Prior Art] Conventionally, in the ground improvement method of injecting a chemical solution into the ground, a rod is inserted to a predetermined depth by a boring machine, a hardening material is pressure-fed through a swivel, and the rod is injected and injected into the ground. There is a rod injection method of rotating and raising. In this injection method, when the boring rod is inserted to a predetermined depth, the rod insertion space is secured by ejecting water from the lower injection hole while excavating by the excavating blade provided at the rod tip. When the depth is reached, the jetting is temporarily stopped, the swivel is removed, the steel ball is dropped from the upper end of the rod to drop it, and then the lower jetting hole is closed. A method is used in which a material is pressure-fed and a hardened material is injected from a lateral injection hole at the tip of a rod to inject it into the ground.

[Problems to be Solved by the Invention] In the above process, swivel removal and assembly work at the time of shifting from the boring process to the hardening material injection process are indispensable, but this work not only causes interruption of the entire process. However, it has a drawback that it is complicated in itself, and if the length of the rod to be used is longer than the desired depth, the work is performed at a high place requiring a scaffold.

It is an object of the present invention to simplify the work and to perform it more safely and reliably on the ground without requiring a scaffold.

[Means for Solving the Problems] According to the present invention, a rod main body having a lower injection hole and a side injection hole at the lower end is connected to a rotary up-and-down moving mechanism, and the upper end of the rod has a high pressure through a swivel and a pumping hose. In a ground improvement device connected to a slurry pump, a bypass pipe containing a steel ball is connected in parallel in the middle of a pressure-feeding hose via a detaching mechanism, and the pressure-feeding hose side and the bypass pipe side are provided on both sides of the attaching / detaching mechanism. Or a T-shaped tube consisting of a tube fixed horizontally in the same device and a branch tube connected vertically in the middle and extending vertically upward in a similar device is provided in the middle of the pressure-feeding hose via the attaching / detaching mechanism. Connect in series,
The present invention provides a ground improvement device characterized in that a pressure gauge is provided on the horizontal pipe, two valves are provided on the vertical pipe, and a steel ball is built in between the two valves.

[Operation] Since the present invention is configured as described above, in use thereof, when the boring rod reaches a predetermined depth, the steel ball in the bypass pipe or the T-shaped pipe is opened and closed by opening and closing the valve. The hardened material is pressure-fed together with the hardened material, is transferred to the tip of the rod, and the lower injection hole is blocked by the pressure-feeding pressure.

Example An example will be described below with reference to the drawings. As shown in FIG. 1, the injection rod 10 is connected by a rotary vertical movement mechanism 11 so that vertical movement operation and rotation operation can be performed. Injection rod 10
As shown in FIG. 2, a side injection hole 17 and a lower injection hole 16 are provided at the lower tip of the.

The top end of the injection rod 10 has a swivel 12 and a pressure hose.
It is connected via a 13 to a high pressure slurry pump 15.

When inserting the rod into the ground, the rod is inserted while excavating while feeding water, but the water is jetted from both the lower jet hole 16 and the side jet hole 17 at the tip of the rod.

A bypass pipe containing a steel ball 18 is provided in the middle of the pressure-feeding hose 13.
14 are connected to each other through the attaching / detaching mechanism 20, and the valves 19 are provided on both sides of the attaching / detaching mechanism 20 on the pumping hose side and the bypass pipe side, respectively.
a, 19b, 19c and 19d are provided. When the rod reaches a predetermined depth, the hardened material is pumped under high pressure, and the valves 19a, 19
By opening b, 19c, and 19d, the steel ball 18 is moved to the tip of the rod together with the hardening material.

The steel ball 18 that has moved to the tip of the rod closes the lower injection hole 16 as shown in FIG. 3, and is pressed by the hardening material by the pressure feeding pressure. As a result, the hardening material is ejected only from the side injection holes, and the hardening material is injected into the ground by rotating and raising the rod. After the steel ball has moved to the tip of the rod, the hardening material is pressure-fed by closing the valves 19a, 19b, 19c, and 19d only by the pressure-feeding hose.

When so-called cement milk was used as a hardening material and the above-mentioned operation was carried out at a pressure feeding pressure of 300 kg f / cm ² , it was confirmed that the desired effect was obtained.

FIG. 4 shows an embodiment in which the fifth valve 19e is provided in the portion of the pressure-feeding hose which is in parallel with the bypass pipe. wrecking ball
At the time of transferring 18, not only the four valves 19a, 19b, 19c and 19d are opened, but also by closing 19e, the pumping pressure is not dispersed and is transmitted only to the bypass pipe, so that the desired result can be more reliably obtained. can get.

FIG. 5 shows an embodiment in which the above-mentioned effect is obtained by the T-shaped pipe 25 without using the bypass pipe. The T-shaped pipe 25 is composed of a horizontal pipe and a vertical pipe connected to the horizontal pipe in a branched manner. The horizontal pipe has a pressure gauge 21 and the vertical pipe has a valve.
23a and 23b are provided, and a steel ball (24) is built in between the two valves.

In transferring the steel balls 24, the pump 15 is stopped from pumping water, and the pressure gauge 21 confirms that the pressure in the horizontal pipe has sufficiently decreased, and the valve 23b is opened. The steel ball 24 falls into the horizontal pipe due to its weight. After that, the valve 23b is closed, and the hardening material is pumped by the pump 15 to move the steel ball 24 together with the hardening material to the tip of the rod. The subsequent steps are the same as in the case of the bypass pipe. Unlike the bypass pipe, the T-shaped pipe is connected in series to the pressure feeding hose, so that the problem of partial pressure does not occur.

[Effect] The present invention has a relatively simple configuration and structure as described above.
It has an effect that the ejection direction of the hardened material can be controlled safely and reliably.

Further, the steel ball, the bypass pipe, the T-shaped pipe and the like used in the present invention can be repeatedly used by operating the attaching / detaching mechanism, the valve and the like.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is the whole ground improvement apparatus having a bypass pipe, FIG. 2 is the tip of the rod when the rod is inserted into the ground, and FIG. 4 is an embodiment in which a valve is provided at a portion of a pressure-feeding hose which is in parallel with a bypass pipe, and FIG. 5 is a ground improvement device having a T-shaped pipe. Is shown. 10 …… Injection rod 11 …… Rotating vertical movement mechanism 12 …… Swivel 13 …… Pressure feeding hose 14 …… Bypass pipe 15 …… High pressure slurry pump 16 …… Lower injection hole 17 …… Side injection hole 18 …… Steel ball 19a, 19b, 19c, 19d, 19e …… Valve 20 …… Detachable mechanism 21 …… Pressure gauge 22 …… Safety lid 23a, 23b …… Valve 24 …… Steel ball 25 …… Tee tube 26 …… Stand

Claims (3)

[Claims] 1. A ground comprising a rod main body having a lower injection hole and a side injection hole at its lower end connected to a rotary up-and-down moving mechanism, and an upper end of the rod connected to a high-pressure slurry pump via a swivel and a pressure-feeding hose. In the improved device, a bypass pipe containing a steel ball is connected in parallel in the middle of a pressure-feeding hose via a detaching mechanism, and valves are provided on both sides of the detaching mechanism on the pressure-feeding hose side and the bypass pipe side, respectively. A ground improvement device. 2. The ground improvement device according to claim 1, wherein a valve is provided in the middle of a portion of the pressure-feeding hose which is parallel to the bypass pipe. 3. A rod main body having a lower injection hole and a side injection hole at its lower end is connected to a rotary up-and-down moving mechanism, and
In a ground improvement device in which the upper end of the rod is connected to a high-pressure slurry pump through a swivel and a pressure-feeding hose, a T-shaped pipe consisting of a horizontally fixed pipe and a vertically extending branch pipe connected to the pipe is attached and detached. Connected in series in the middle of the pressure-feeding hose via a mechanism, a pressure gauge is provided on the horizontal pipe,
A ground improvement device characterized in that two valves are provided in the vertical pipe, and a steel ball is built in between the two valves.