JPH0121276Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Purpose of the invention] "Industrial application field" This invention is a method of using earth and sand pumping pipes, and more specifically, when excavated earth and sand is discharged to a starting shaft or above ground in tunnel construction, etc. This relates to an earth and sand pumping pipe that is passed through the main body to be pumped.

``Prior art'' In tunnel construction, etc., in order to pump earth and sand over long distances (for example, over 200 m), the earth and sand must be pumped with an anti-friction material (water, or muddy water containing agglomerated particles (clay)). ) to soften the soil. This reduces pressure loss during pumping of earth and sand through pipes, making it possible to pump earth and sand over long distances with less pumping force. However, on the other hand, if the earth and sand are softened, it becomes impossible to dispose of the earth and sand as is, and the earth and sand must be post-processed, which incurs a large amount of cost. For this reason, it is desirable to pump the earth and sand through pipes while keeping it as hard as possible.

Here, the flow state of the earth and sand in the pressure feeding pipe will be explained with reference to FIG. 2.

The earth and sand 1 is flowing in a plug flow state with a uniform velocity over the entire cross section of the pipe bodies 5, 5.... Therefore, the earth and sand 1 inside the pipe bodies 5, 5... slides on the wall surfaces inside the pipe bodies 5, 5... and is pumped in a cylindrical state. Therefore, if an anti-friction material is supplied between the inner wall surface of the pipe bodies 5, 5... and the surface of the earth and sand 1 to reduce the friction between the pipe bodies 5, 5... and the earth and sand 1, the earth and sand 1 long-distance pressure feeding becomes possible.
As a result, unlike softening all of the earth and sand 1 inside the pipe bodies 5, 5..., only the portion of the earth and sand 1 that is in contact with the inner wall surface of the pipe bodies 5, 5 is softened. , a small amount of the soft part of the earth and sand 1 is required, and there is no need to perform post-treatment of the earth and sand 1. It is sufficient to install earth and sand pumping pipes having such an anti-friction material supplying function every 100 m or 200 m, and the intervals at which these earth and sand pumping pipes are installed may be determined depending on the properties of the earth and sand 1 to be pumped.

In the above case, it is most desirable that the anti-friction material be supplied in a small amount and evenly between the inner wall surfaces of the pipe bodies 5, 5, . . . and the surface of the earth and sand 1.

Next, a conventional earth and sand pumping pipe will be explained with reference to FIG.

A conventional earth and sand pumping pipe has a male flange portion 50 and a female flange portion 51 fixed to both ends of the pipe body 5, respectively. The male flange portion of another pipe body 5 is fitted into the female flange portion 51 of this certain pipe body 5, and the male flange portion 50 and the female flange portion 51 are fastened with bolts 52, and the pipe body 5 and the pipe body 5 are Connect with. below,
Similarly, a predetermined number of pipe bodies 5, 5, . . . are connected. This predetermined number of connected pipe bodies 5, 5...
An anti-friction material supply means is provided at a predetermined position inside. That is, an annular anti-friction material supply groove 3 is provided on the inner wall surface of the male flange portion 50 and female flange portion 51 of the pipe bodies 5, 5 at the location where the anti-friction material supply means is installed, and On the other hand, the anti-friction material supply port 2 is provided on the upstream side, that is, on the female flange portion 51 of the pipe body 5, so as to communicate with the supply groove 31.

Next, the function of this conventional earth and sand pumping pipe will be explained. First, an anti-friction material supply device (not shown)
The anti-friction material supply hose 4 connected to the supply port 2 is connected to the supply port 2. Next, the supply device is driven. Then, the anti-friction material (indicated by dots in the drawing) 6 passes through the supply hose 4, the supply port 2, and the supply groove 3 between the inner wall surface of the pipe bodies 5, 5... and the surface of the earth and sand 1. , only the parts of the earth and sand 1 that are in contact with the inner wall surfaces of the pipe bodies 5, 5... are softened, and the friction between the inner wall surfaces of the pipe bodies 5, 5... and the surface of the earth and sand 1 is reduced. Reduced. As a result, the earth and sand 1 can be pumped over a long distance with a small pumping force, and there is no need to perform post-treatment of the earth and sand 1.

"Problems to be Solved by the Invention" However, the above-mentioned conventional earth and sand pumping pipe has the following problems.

(1) Since no means is provided to prevent the intrusion of earth and sand, the earth and sand 1 enters the supply port 2 through the supply groove 3, clogging the supply port 2 and making it difficult to supply the anti-friction material 6.

(2) Also, the earth and sand 1 enters the supply groove 3, clogging the supply groove 3 in places, making it impossible to uniformly supply the anti-friction material 6 to the entire circumference of the inner wall surface of the pipe bodies 5, 5... Can not.

(3) Furthermore, since the supply port 2 is simply provided in communication with the supply groove 3, the supply pressure of the anti-friction material 6 from the supply groove 3 near the supply port 2 is high; The supply pressure of the anti-friction material 6 from the supply groove 3 decreases as the distance from the mouth 2 increases.
The anti-friction material 6 cannot be uniformly supplied over the entire circumference of the inner wall surface of the pipe body. For this,
It is necessary to supply a large amount of anti-friction material 6, and soil 1
may change the properties of the material and require post-processing.

The purpose of the present invention is to solve the above-mentioned problems.

[Structure of the invention]

``Means for Solving the Problems'' This invention provides an annular anti-friction material reservoir chamber in the pipe body, and an annular anti-friction material spout on the inner wall surface of the pipe body as the anti-friction material reservoir chamber. an anti-friction material supply port is provided in the pipe main body in communication with the anti-friction material reservoir chamber, and the anti-friction material supply port and the anti-friction material spout in the anti-friction material reservoir chamber are provided in communication with the pipe body; An annular valve member is interposed between the two pipes, and the valve member is configured to close when the pressure on the anti-friction material supply port side in the anti-friction material storage chamber is lower than the pressure inside the pipe body, and to open when the pressure is higher than the pressure inside the pipe body. It is characterized by

"Function" This invention works when the pressure on the anti-friction material supply port side in the anti-friction material reservoir chamber is lower than the pressure inside the pipe body, the valve member closes, and the earth and sand enter the anti-friction material reservoir chamber and the anti-friction material supply port. Prevent it from getting into your mouth. Additionally, when the pressure on the anti-friction material supply port side in the anti-friction material storage chamber is greater than the pressure inside the pipe body, the valve member opens and the anti-friction material flows from the anti-friction material spout to the inner wall surface of the pipe body and the earth and sand. It is evenly supplied all around the surface.

"Embodiment" Hereinafter, an embodiment of the earth and sand pumping pipe according to the present invention will be described with reference to FIG. 1.

FIG. 1 is a sectional view showing an embodiment of the earth and sand pumping pipe of the present invention. In the figure, the same reference numerals as in FIG. 2 indicate the same parts.

Therefore, in this embodiment of the earth and sand pumping pipe of the present invention, an annular anti-friction material reservoir chamber 7 is provided in the pipe bodies 5, 5. This anti-friction material reservoir chamber 7 is formed between a convex portion 53 of the male flange portion 50 and a female flange portion 51.
It is surrounded by a recess 54 and a flange 55 of the female flange 51. An annular anti-friction material spout 9 is provided on the inner wall surface of the pipe bodies 5, 5 so that the interior of the pipe bodies 5, 5... communicates with the anti-friction material reservoir chamber 7. The anti-friction material spout 9 is provided between the inner wall surface of the male flange section 50 and the end surface of the flange section 55 of the female flange section 51, facing downstream with respect to the flow direction of the earth and sand 1. . An anti-friction material supply port 2 is provided in the female flange portion 51. An annular valve member 8 is interposed between the anti-friction material supply port 2 and the anti-friction material spouting port 9 in the anti-friction material storage chamber 7. This valve member 8 includes a space extending in the axial direction of the pipe bodies 5, 5...
That is, the fixing part 80 is interposed between the convex part 53 of the male flange part 50 and the collar part 55 of the female flange part 51 and is fixed to the convex part 53 of the male flange part 50.
and a lip part 81 which is integrally provided in a direction to prevent dirt 1 from entering the fixing part 80 and comes into contact with and separates from the collar part 55 of the female flange part 51. When the pressure on the anti-friction material supply port 2 side in the anti-friction material reservoir chamber 7 is lower than the pressure inside the pipe bodies 5, 5..., the valve member 8 opens the lip portion 8.
1 comes into contact with the flange 55 and closes. In addition, the pressure on the antifriction material supply port 2 side in the antifriction material reservoir chamber 7 is higher than the pressure inside the pipe bodies 5, 5..., that is, the pressure inside the pipe bodies 5, 5... , 5... is greater than the sum of the pressure required to push open the lip portion 81 when the pressure is 0 kg/cm ² .
The lip portion 81 is configured to open away from the collar portion 55.

Note that the inner diameters of the pipe bodies 5, 5, . . . , the male flange portion 50, and the female flange portion 51 are the same.

Since the earth and sand pumping pipe of the present invention in this embodiment has the above-described configuration, the pressure inside the pipe bodies 5, 5... is lower than the pressure on the anti-friction material supply port 2 side in the anti-friction material reservoir chamber 7. If the lip portion 81 of the valve member 8 is small, the lip portion 81 of the valve member 8 is closed, and it is possible to prevent the dirt 1 inside the pipe bodies 5, 5, . Moreover, since the lip portion 81 of the valve member 8 is oriented in a direction to prevent dirt 1 from entering, the pipe bodies 5, 5...
The higher the internal pressure, the more strongly the lip portion 81 is pressed against the flange portion 55 and the sealing performance is enhanced.
Therefore, the earth and sand 1 enters the anti-friction material reservoir chamber 7 and the anti-friction material supply port 2, and enters the anti-friction material reservoir chamber 7 and the anti-friction material supply port 2.
There is no risk that the friction reducing material 6 will be difficult to supply due to clogging. Furthermore, there is no possibility that the anti-friction material supply port 2 may become clogged in some places and the anti-friction material 6 cannot be uniformly supplied over the entire circumference of the inner wall surfaces of the pipe bodies 5, 5....

Then, the anti-friction material 6 is supplied into the anti-friction material reservoir chamber 7, and the pressure within the anti-friction material reservoir chamber 7 is increased to the pipe bodies 5, 5.
..., the lip portion 81 of the valve member 8 opens, and the anti-friction material 6 in the anti-friction material reservoir chamber 7 flows from the anti-friction material spout 9 to the inner wall surface of the pipe bodies 5, 5... and the surface of the soil 1. Then,
Only the parts of the earth and sand 1 that are in contact with the inner wall surfaces of the pipe bodies 5, 5... are softened, and the pipe bodies 5, 5 are softened.
The friction between the inner wall surface of ... and the surface of the earth and sand 1 is reduced. As a result, the earth and sand 1 can be pumped over a long distance with a small pumping force, and there is no need to perform post-treatment of the earth and sand 1. At this time, since the annular valve member 8 was interposed between the annular anti-friction material reservoir chamber 7 and the annular anti-friction material spout 9, the anti-friction material in the annular anti-friction material reservoir chamber 7 6 pressure can be kept uniform. Therefore, when the lip 81 of the annular valve member 8 opens, the anti-friction material 6 flows from the anti-friction material spout 9 to the pipe bodies 5, 5 with uniform supply pressure.
It is uniformly supplied over the entire circumference of the inner wall surface of...
As a result, the amount of anti-friction material 6 supplied can be reduced, and post-treatment of earth and sand 1 is completely unnecessary.

In this embodiment, since the anti-friction material spout 9 is oriented downstream with respect to the flow of the earth and sand 1, there is no possibility that the dirt 1 will enter the anti-friction material spout 9. Furthermore, the anti-friction material 6 can be supplied between the inner wall surfaces of the pipe bodies 5, 5... and the surface of the earth and sand 1 without roughening the earth and sand 1 in a plug flow state, and therefore a small amount of the anti-friction material 6 can be supplied between the inner wall surfaces of the pipe bodies 5, 5... The supply is sufficient.

[Effect of idea]

As is clear from the above examples, the earth and sand pumping pipe of the present invention can achieve the following effects.

(1) An annular valve member is interposed between the annular anti-friction material reservoir chamber and the annular anti-friction material spout, so that earth and sand are prevented from entering the anti-friction material reservoir chamber and the anti-friction material supply port. can be prevented. Therefore, there is no risk of difficulty in supplying the anti-friction material.

(2) The anti-friction material can be uniformly supplied all around the inner wall surface of the pipe body by the action of the valve member. Therefore, only a small amount of anti-friction material needs to be supplied, and post-treatment of the earth and sand is not required.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the earth and sand pumping pipe according to the present invention. FIG. 2 is a sectional view showing a conventional earth and sand pumping pipe. 1... Earth and sand, 2... Anti-friction material supply port, 5... Pipe body, 6... Anti-friction material, 7... Anti-friction material reservoir chamber, 8
... Valve member, 81 ... Lip portion, 9 ... Anti-friction material spout.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. An annular anti-friction material reservoir chamber is provided in the pipe body, and an annular anti-friction material spout is provided on the inner wall surface of the pipe body to communicate the anti-friction material reservoir chamber and the pipe body. an annular pipe is provided between the anti-friction material supply port in the anti-friction material reservoir chamber and the anti-friction material spout port in the anti-friction material reservoir chamber; Sediment comprising a valve member, and the valve member is configured to close when the pressure on the anti-friction material supply port side in the anti-friction material reservoir chamber is smaller than the pressure inside the pipe body, and to open when the pressure is larger than the pressure inside the pipe body. pressure pipe. 2. The earth and sand pumping pipe according to claim 1, wherein the anti-friction material spout is oriented in the downstream direction of the flow of earth and sand within the pipe body.