JPS58143094A - Grout injection of pipe embedding machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for injecting grout into a controlled river using maintenance equipment.

Conventional methods (1) Preventing ground subsidence by backfilling the gap between the buried pipe and the ground caused by the uptake of too much earth and sand, (2) Adding a lubricant to reduce the frictional resistance between the buried pipe and the ground during propulsion. For this purpose, grout was injected using the following method.

Grout 11rJ1 is filled into the gap e between the buried pipe 1 and the ground d by guiding the grout through the dedicated pipe C into the hole drilled in the buried pipe C and squirting the grout out of the hole (see Fig. 11).

Alternatively, a person may inject grout into the buried pipe a by entering the hole.

However, specialized equipment or equipment for grouting is required, or manual labor must be relied upon.

Also, the hole had to be completely plugged to complete the grout injection (and it was expensive because it required special buried grout).

The present invention has been developed in view of the above points, and its main purpose is to eliminate the need for a 4kvjt and equipment dedicated to grouting, and for grouting enthusiasts to install buried pipes without the need for humans to enter the buried pipes. It frees you from the work inside the pipe, and you can use a buried pipe that does not require a hole for grout injection, making it cheaper. Grout injection method for maintenance equipment performed at the same time t-
It is about providing.

Hereinafter, the present invention will be explained in more detail with reference to FIGS. Cutter head 2
An earth and sand depositing port 3 and a cutter 4 are provided at the front end.

Further, a stirring plate 6 is provided inside the cutter head 2 and is attached to the cutter head 2 via a bracket 5tP.

In the drawing, 7 is a connecting pipe, and the connecting pipe 7 passes through the canterhead 2 and is connected to the pipe propulsion device i[1,
A threaded connection s8 is formed at the front end of the connecting tube 7. The connecting pipe 7 has an input port 9 formed therein.

A pinch valve 10 for the slurry pipe is provided in the connecting pipe 7.
A funnel-shaped inlet pipe 11 is attached to the rear end of the slurry pipe pinch valve 10. .

A slurry pressing water pipe 12 and a stirring water pipe 13 are attached to the outer circumference of the connecting pipe 7, and these water pipes +2, 13Ku
Water pipe river pinch valves 14 and 15 are provided. The vks of the slurry pressing water supply pipe 12 is inserted into the connecting pipe 7, and a slurry pressing nozzle 16 is attached to the end thereof, which constitutes a pressing water mechanism. Stirring water pipe 13
The stirring water pipe 13 is inserted into the rear sFi connecting pipe 7 and is provided with a nozzle 17 for preventing slurry washing and a nozzle 18 for stirring the slurry.
m has been completed.

The slurry pressing nozzle 16 faces the center of the inlet of the inlet pipe 11, the slurry washing prevention nozzle 17 faces the end of the inlet of the inlet pipe 110, and the slurry stirring nozzle 18 faces the cutter head. Facing within 2.

A screw conveyor 19 that receives rotational driving force from the tube propulsion device [1] is provided in the connection '#t7.

Pinch valve for slurry pipe 10, pinch valve in water pipe 14.1
5 is the pipe 20.21.5 from the ground compressor 43.
22 supplies compressed air.

23 in the drawing is a pilot pipe, and this pylon)'1
A connection @ connected to the connection part 8 of the connection pipe 7 at ii23
In addition, a water supply pipe 25 connected to the 1J slurry pressure water supply pipe I2 and a water supply pipe 26 connected to the stirring water supply pipe 13 are added to the outside of the connecting pipe 7.

In the drawing, 27 is a leading pipe, and the outer part of this leading pipe 27 is connected to the water pipes 25 and 26 for water supply. ! ?
28.29 is installation.

30 in the drawing is a slurry pipe, and this slurry 1t30
The rear end is connected to a slurry pipe pinch valve 10, and a hK company style cap valve 31 and a pinch valve 44 are attached to the end of the slurry pipe 30.

The flow cap meter 44 and flow control valve 31 are connected to a control ignition system 45. The tube propulsion device 1 has a water pressure P1 and an internal pressure P in the cutter head 2! A pressure detector that outputs a differential pressure t@ is provided, and the output signal of this differential pressure detector is input to the control device 45.

Next, the operation tm will be explained.

First, after burying the leading pipe 271r in the launch shaft 32 using a small diameter pipe propulsion device (not shown) that can adjust the direction, the leading pipe 271r
Connecting pipe 7 of the pipe propulsion device 1 through the pilot pipe 23 to 7
Connect to. This joint pipe 127 water pipe 2g, 29t
; The water supply pipes 25 and 261 of the I pilot pipe 23 are connected to the slurry pressing water supply pipe 12 and the stirring water supply pipe 13, and the water supply pipes 28 and 29 are connected to the pipes 34 arranged in the reaching hole 33.
．． It is connected to the discharge of a pump 36 via 35. The pump 36 is provided in a water tank 37, and the water tank 37 receives water from a settling tank 38.

In addition, slurry [3
0 is inserted, and this slurry pipe 30 is connected to the outlet hook of the pinch valve 10 for slurry pipe. Slurry pipe 30 is connected to soil removal tank 39.

A sand pump 40 is installed in the tilled soil tank 39.
The discharge 11J of the sand pump 40 is connected to the sedimentation tank 38 via the Ire piping 41.

The cutter head 21r is rotated by the drive of the tube propulsion device 1, excavates the earth with the cutter 4, and is propelled by the thrust device 143.

The earth and sand excavated by the cutter 4 is deposited into the cutter head 2 through the intake port 3. The water supplied to the stirring water pipe 13 by driving the pump 36 is injected through the slurry stirring nozzle 18 and is injected into the earth and sand. Further, the earth and sand are stirred by the stirring plate 6 by the cutter head 20 rotations, and are turned into slurry in the earth and sand in the cutter head 2.

The slurry-formed earth and sand is supplied by the screw conveyor 19 from the inlet pipe 11 into the slurry pipe 30 via the slurry pipe pinch valve 10t.

At this time, the earth and sand that has been turned into a slurry is pressed into the slurry pipe 30 by the water ejected from the slurry pressing nozzle 16 .

Further, the water injected from the slurry precipitation prevention nozzle 17 prevents sedimentation of Ω soil at the inlet portion of the inlet pipe II.

The earth and sand transported by the slurry pipe 30 enters the soil removal tank 39, and the water that overflows the sedimentation tank 38 due to the drive of the sand pump 40 enters the water supply tank 37.

When the flow rate control valve 31t is opened or closed, the valve pressure loss changes as shown in FIG. Therefore, the pressure inside the cutter head 2 is P@/rl p, = valve pressure loss element slurry pipe 30
It is an internal loss and increases or decreases by 9.

In this way, the internal pressure Pl of the cutter head 2 is controlled by the flow rate control valve 31.
can be controlled by

If Pl > Ps (II In Fig. 5, flow control valve 3
1 In the direction of closing a), water flows in from the external ground.

If Ps<I'x (direction b in which the flow rate control valve 31 is opened in Fig. 115), water is released to the outside.

When P, := P, , water no longer flows in and out from the external ground. In this case, the quicksand flow 'kJ phenomenon disappears j!
1 Ganggo-1XL1rl@l can be entered.

From the above, another way of looking at it is that the water supply lid GLI (QlA
1QtB) and slurry flow tQ t-N of flow control valve 31
If the U-clause is activated, water will no longer flow in and out.

That is, the slurry flow kQmt is known by the flow meter 44,
What is necessary is to change the opening degree of the flow rate control valve 31 to make it equal to the water supply lid Q1.

In addition, the conditions for PM=Pi change slightly due to the introduction of earth and sand.

In other words, if the water supply is 11t''GLttA+ and the top sand intake is gt/min, then q=s-v (1
) S is the earth and sand inlet face value V is Qx from the propulsion speed ” '1lLs+q = Qs+@,
v −-”−(21q=s, where v is generally GL, a few percent of propulsion speed Hv is an ignored angle when it is small.

However, when the propulsion speed [v- is large, ri (slurry flow rate Q) may be determined by equation 21.

FIG. 6 shows the dependence of the slurry flow rate Q on the plume.

Experimental data Fiq/Q1=7% propulsion speed V-20Ca/
This is the case for minutes.

According to this, it can be seen that Q+ = ':h is almost good.

Furthermore, when excavation is performed more accurately, the value of the optimum slurry flow 11Qx changes due to changes in the propulsion speed V.

As can be seen from FIG. 6, the theoretical excavation amount is Qtomi/Q1=+oo%, so the optimal excavation condition is Pl==P, that is, no water coming in or going out.

Therefore, the differential pressure t between Pl and P3 tl-11 is detected by the differential pressure detector 48 - the electrical signal 49 is sent to the starting shaft 32 @ from the ground to the control device in the reaching shaft 33 @ 45
, and adjust the opening degree of the flow rate control valve 31 so that P, -P, becomes zero.

As described above, the water pressure is balanced with the water pressure of the ground by adjusting the water supply and drainage ott flow rate control valves 31.

Now, the internal pressure P of the cutter head 2 is caused by flowing the grout If into the 2-way pressurized water pipe 12 and forcing the flow cover control valve 31.
By increasing , the water pressure balance is actively disrupted, grout is ejected from the earth and sand intake port 3 of the cutter head 2, and the grout is backfilled into the buried pipe 44 and a part of the ground.

The present invention has been described in detail above, and after the leading pipe 27 has been laid from the starting shaft 32 to the reaching shaft 33, the pipe propulsion device 1 is attached to the rear end of the leading pipe 270. The excavated earth and sand are excavated by the r thruster @I, and the hollow m of the leading pipe 27 or a part of the leading pipe 27 is used to supply water to the pipe propulsion device, and the excavated earth and sand are supplied to this water. In the method of completely mixing the soil into a slurry and discharging it to the reaching pile, a slurry (Clara) is provided in the conveying section that supplies the slurry to the one-pipe propulsion device 11 and conveys the slurry instead of water.
By reducing the value of the cffe amount control valve 31, the internal pressure of the cutter head 2 is increased, and all of the grout is ejected from the earth and sand intake port 3 of the cutter head 2. This eliminates the need for equipment and equipment dedicated to grout injection, eliminates the need for humans to enter the buried pipe 44 for grout injection, and frees people from working inside the buried pipe 44. It is possible to use a buried pipe 44 that does not require a hole, which makes it cheaper, and furthermore, it can be carried out at the time of advancing the buried pipe and grouting farmland.

[Brief explanation of drawings]

, Figure 1 is a close-up view of the conventional grouting method, Figure 2
The figure is an explanatory diagram of a pipe burying method equipped with a grout injection method according to an embodiment of the present invention, FIG. 3 is a vertical cross-sectional view of the part 1 in FIG. 2, FIG. FIG. 6 is a diagram showing the pressure distribution of the slurry transport path, FIG. 6 is a diagram showing the relationship between the slurry flow lid and the excavation lid, and FIG. 7 is a detailed explanatory diagram of the present invention. : is a pipe propulsion device, 27 is a leading pipe, and 31 is a flow control valve.

Claims (1)

[Claims] After the leading pipe 27 is laid from the starting @ 32 to the reaching shaft 33, the pipe propulsion device 1 is attached to the rear end of the leading pipe 27, and the pipe propulsion device I excavates the earth and sand, and the aIII All earth and sand is moved into the leading pipe 27. In the method of supplying water to the pipe propulsion device 1 by using -S of the section or leading pipe 27, and mixing the excavated earth and sand with this water to form a slurry and discharging the earth to the reaching shaft side, it is possible to convert it into water. 1) Supply to the 1-tube propulsion device a11
J-111! The internal pressure of the cutter head 2 is increased by reducing the flow rate control valve 310 installed in the transporting section, and the earth and sand filling hole 3L of the cutter head 2 is spouted out, and the grout is connected to the buried pipe 44 and the ground. A method of grouting with a V-grouting machine, in which the grout is filled into the gap between the grooves.