JPH0613839B2 - Water supply device for mortar kneading - Google Patents

Description

TECHNICAL FIELD The present invention relates to a mortar kneading water supply device for supplying a stable amount of water to a continuous kneading mortar pouring machine for fixing lock bolts mainly in tunnel excavation work and the like. Is.

[Conventional technology]

Conventionally, when excavating a mountain tunnel or the like, a NATM method has been adopted in which a large number of rock bolts are embedded in the excavated cross section and mortar is sprayed on the rock bolts.

At the time of kneading the mortar used to fix the lock bolts, as shown in the water supply circuit diagram of FIG. 4, the main pump 2 which is the water supply source for the inside and outside of the tunnel mine is used to supply water to the continuous mortar injector 1. The main pump 2 is connected to a water supply line 10 provided with a three-way valve 3, an automatic air bleeding valve 4, a solenoid valve 5 and a flow meter 7, and the main pump 2 is connected to the mortar injector 1. Water is directly supplied, and in order to reduce the supply pressure from the main pump 2, a two-stage pressure reducing system is adopted for the water supply pipe line 10, and two pressure reducing valves 8A and 8B are used to provide a predetermined pressure. I try to get water pressure.

On the other hand, the flow rate adjusting valve 6 adjusts the amount of water supplied so that a predetermined flow rate of water to the mortar injector 1 can be obtained.

Therefore, the amount of water supplied by the main pump 2, which is the water supply source used for tunnel excavation, tends to fluctuate,
For example, a fluctuation of about ± 10 occurs in the mortar flow value.

Further, when the length of the main water supply pipe 20 from the main pump 2 is extended with the tunnel excavation depth, the set water supply amount is changed, and the rotation of the power source such as the generator driving the main pump 2 at the time of rising. The amount of water supply also changes due to fluctuations.

As a result, there is a problem that it is necessary to periodically calibrate the water supply amount, which is troublesome.

Further, unless the mortar injecting machine 1 is constantly supplied with a stable amount of water, the water-cement ratio of the mortar fluctuates, and as a result, stable fixing of the lock bolt cannot be achieved.

[Problems to be Solved by the Invention]

The present invention has been made to solve the above-mentioned conventional problems, and in particular, the amount of water supplied for mortar kneading to the mortar injecting machine for embedding a rock bolt in tunnel excavation work can be always a constant constant amount of water. The problem to be solved is to provide a water supply device for mortar kneading.

[Means for Solving the Problems]

As a means for solving the above problems, the water supply device for mortar kneading of the present invention is provided with a water tank for temporarily storing a part of the supply water from the main pump of the water supply source, and the water tank is exclusively used for the mortar injecting machine. It is configured by arranging a pressure adjusting valve with a bypass passage to the water tank in the water supply pipe that supplies water through the water supply pump, and by further providing a minute flow rate constant value control valve in the water supply pipe. Yes, the supply water once stored in the water tank flows to the water supply pipe line by a dedicated water supply pump, but when the water pressure fluctuates when the water supply pump is started or when the mortar injection machine is stopped, etc. It is designed to circulate, and the amount of water supply is set and secured by the minute flow rate constant value control valve.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a water supply circuit diagram of a water supply device for mortar kneading in one embodiment of the present invention, and FIG. 2 is a relational diagram between the actual and discharge amount of water and the indicated value of a flow meter when the device of FIG. 1 is adopted, FIG. 3 is a diagram showing the mortar flow value and the number of continuous measurements when the apparatus of FIG. 1 is adopted.

First, the apparatus of the embodiment of the present invention shown in FIG. 1 is used at the same time as the conventional example shown in FIG. 4 at the time of kneading mortar used for fixing the lock bolt embedded in the excavated portion at the time of tunnel excavation. This is a water supply device, and the same parts are shown in FIG. 4 and FIG. 1 with the same part numbers.

Therefore, in this embodiment, the main water supply pipe 20 from the main pump 2, which is a water supply source for water required for excavation, is branched to
A water tank 11 for temporarily storing a part of the supply water is provided, and a water supply pump 12 dedicated to supplying water from the water tank 11 to the mortar injecting machine 1 is connected to the water tank 11 and the mortar injecting machine 1. It is installed on road 10.

Further, the water supply pipe line 10 is provided with a bypass line 17 to the water tank 11, and the bypass line 17 is provided with a pressure adjusting valve 13.

The pressure adjusting valve 13 is installed on the discharge side of the water supply pump 12 in order to reduce fluctuations in the discharge pressure of the water supply pump 12, and is bypassed to the bypass passage 17 as described above. A valve that is commonly used, also called a valve, can be adopted.

By interposing this pressure adjusting valve 13, the water supply pump 12
When the water pressure fluctuates when the engine is started or when the mortar injector 1 is stopped, water is circulated from the pressure adjusting valve 13 into the water tank 11 via the bypass passage 17.

Furthermore, in addition to the automatic air bleeding valve 4, the pressure gauge 16, the flow meter 7, and the solenoid valve 5 being provided in the water supply pipe line 10, a minute flow rate constant value control valve 14 is also provided. The amount of water is set and secured.

The minute flow rate constant value control valve 14 is also called, for example, a flowmatic mini valve, and a commercially available one can be used. With this, the minute flow rate constant value control valve 14 is finely adjusted. Is a control valve that, once the flow rate is set, tries to secure the set flow rate by itself even if the differential pressure varies, so that a constant amount of water is always supplied to the mortar injector 1.

Further, one pressure reducing valve 8 is interposed in the water supply pipe line 10, whereby the water pressure of the mortar injecting machine 1 is adjusted.

In addition, what is shown by 15 in FIG. 1 is a mortar injector cleaning line provided with the three-way valve 3.

As described above, in the water supply device of the present invention, the main pump 2 and the mortar injecting machine 1 are not directly connected in the circuit,
The mortar injecting machine 1 has its own water tank 11 and a dedicated water supply pump 12, and its water supply pipe line 10 is provided with a pressure adjusting valve 13 with a bypass line to the water tank and a minute flow rate constant value control valve 14. As a result of an experiment using an actual machine of the apparatus in the above-mentioned embodiment, the actual discharge water amount Qw and the indicated value by the flowmeter 7 are the same as the flowmeter 7 as shown in FIG. It was confirmed that the same discharge amount Qw was obtained.

Further, as for the relationship between the mortar flow value and the continuous measurement number N when the discharge water amount Qw = 5.4 / min, as shown in FIG. 3, the mortar flow value is always in a stable state with little fluctuation. It was confirmed.

〔The invention's effect〕

According to the water supply apparatus for mortar kneading of the present invention described above, the operation of the mortar injector is not affected by the fluctuation of the main pump of the water supply source, and regardless of the length of the main water supply pipe, This has the effect of enabling stable operation under the same conditions even in various work locations.

Further, since the pressure adjusting valve copes with the water pressure fluctuation at the time of starting or stopping the mortar injector, the fluctuation of the water supply amount is eliminated, and more stable water supply is performed.

Furthermore, since the constant flow rate control valve supplies a constant amount of water supply to the mortar injector without being affected by slight pressure fluctuations during operation, the mortar water-cement ratio becomes constant, and as a result, There is an advantage that the lock bolt can be fixed with a stable mortar flow value and good work can be performed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a water supply circuit diagram of a water supply device for mortar kneading in an embodiment of the present invention, and FIG. 2 is an actual discharge water amount and a flow meter of the device of FIG. Fig. 3 is a diagram showing the relationship with the indicated value, Fig. 3 is a diagram showing the mortar flow value and the number of continuous measurements when the device of Fig. 1 is adopted, and Fig. 4 is a water supply circuit diagram of a conventional mortar kneading water supply device. Is. 1 ... Mortar injector, 2 ... Main pump, 10 ... Water supply line, 11 ... Water tank, 12 ... Water supply pump, 13 ...
… Pressure control valve, 14… Micro flow rate constant value control valve.

Claims (1)

[Claims] 1. A water tank for temporarily storing a part of water supplied from a main pump of a water supply source is provided, and a water supply line for supplying water from the water tank to a mortar injecting machine through a special water supply pump is provided.
A water supply device for mortar kneading, in which a pressure regulating valve with a bypass passage to the water tank is arranged, and a minute flow rate constant value control valve is provided in the water supply pipe passage.