JPS62266288A - Clearance filling method of double pipe - 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] [Industrial Application Field] The present invention provides a double pipe that efficiently fills the gap formed between the laid sheath pipe and the main pipe that is then clouded inside. The present invention relates to a gap filling method.

[Conventional technology]

The gap formed between the segments laid by the tunnel construction method or the sheath pipe laid by the propulsion method and the main pipe that is subsequently drawn inside these pipes should be backfilled according to the instructions of the road administrator, etc. In many cases, mortar or the like is used as the backfilling material.

5th blade (a+, (bt) is a front view and a side view showing an example of a conventional gap filling method, and this example shows a case where the gap is filled by a person working within the segment. In other words, filling pipe 1 for pumping small-diameter mortar
is installed on the ceiling 2 of the segment 100a, a certain section from 10,000 at the back A of the filling pipe 1 is partitioned off with sandbags, and the mortar 4 is fed in the opposite direction through the filling pipe 1 into the B part of this, and the cut end of the filling pipe 1 is Fill the gap circle with mortar 4 from 1a.

After the mortar 4 has solidified, the sandbag 3 is moved to surround the position C (7), and the pipe 1 is cut out and its outlet is newly installed at the top of the position C. In this way, the mortar 4 is moved again at the position C. After solidifying, this operation is repeated. In this case, the remaining filling tube (for example, 1b) is buried. Note that 5 is the operator, 6 is the main pipe, and 8 is the other pipe.

Fig. 6 is a front view showing an example of a conventional gap filling method for double pipes when the sheath pipe has a small diameter and the distance is short, and an operator cannot work inside the sheath pipe. 1
Since it cannot enter inside the sheath pipe 100, the joint pipe 101'? The mortar 4 is filled into the gap 7 all at once. That is, using a pump (not shown) with a large capacity Z, the mortar 47 gap 7 can be filled in a short time.
It will be filled in. Note that 9 is a blind plate in the gap 7, 10 is an air vent, and 11 is a vertical shaft in the ground 8.

FIG. 7 (al, (bl) is a front view showing another example of the conventional double pipe gap filling construction method when an operator cannot work inside the sheath pipe 100 due to its small diameter, similar to FIG. 6, and This is a z-2 cross-sectional view of the same.This example also uses a method that combines mortar filling at once and transporting the filling tube as in FIG. As shown in FIG.
The small diameters v1a, 1d, ie, and 1f of each of the filling tubes are divided into fixed lengths that are lengthened sequentially, and the required number of tubes are drawn into the gap 7 by 1° according to the respective lengths.

In this way, from the end of the sheath pipe 100, each filling pipe 1ae ici, 1e, 1fy'4 is sequentially filled with mortar 4 into the gap 7. That is, in this example, when the receiving section of one filling tube is completed, the next filling tube is moved on, and the entire section is filled by proceeding sequentially.

[Problems to be Solved by the Invention] The conventional double pipe gap filling method configured as described above has the following drawbacks.

(1) The filling method shown in Figure 5 could be applied to segments with a diameter that would not allow an operator to enter. (2) The filling method shown in Figure 6 could cause the mortar to solidify. There is a 5-hour time limit as the entire area must be constructed by 2 days. In other words, if construction cannot be completed in a short time,
The initially filled mortar is disturbed by the later filled mortar, and as a result, the mortar does not solidify and separates, making it impossible to fill to specifications YM. For this reason, bulk filling of mortar cannot be used for long-distance sheath pipes, and larger pumps must be used to complete construction in a short time, but this requires a large amount of electricity and materials (especially water) at once. ), which increases construction costs and may not be possible in some cases.

(3) The filling method shown in Figure 7 (al, (bl) requires a large number of filling tubes if the sheath tube is long, and it is difficult to attach the filling tubes and draw them into the main pipe. Moreover, there are so many tubes that there is no room for them to be added.Furthermore, some of the large number of filling tubes may break while being drawn in, making it impossible to achieve the initial purpose of transporting mortar. Not only that, but it may also become an obstacle to the main pipe installation itself.

The present invention has been made to solve the above-mentioned problems, and is a gap filling method for efficiently filling the gap formed between the sheath pipe that has been laid and the main pipe that has been drawn into the inside of the sheath pipe. The purpose is to obtain a method.

[Means for solving problems]

The purpose of this invention is the above! It was done to achieve
A pig with a rear wire joined is inserted into a perforated filling pipe that is attached to the main pipe and pulled into the sheath pipe, mortar is forced from behind the pig, and this pressure advances the pig a predetermined distance and stops at a predetermined position. After that, mortar is ejected from the hole of the perforated filling pipe into the gap, and after filling the gap with mortar, the pig is further moved forward and these operations are repeated (by repeating this process, mortar is poured into the gap in the entire area). The purpose of the present invention is to provide a method for filling gaps in a double pipe, in which the gap is filled in a double pipe.

[For production]

The movement of the pig installed in the perforated filling pipe is stopped at every -f distance, mortar is jetted into the gap from the hole in the perforated filling pipe at each stop area, and this operation is repeated to complete the entire area. Complete filling of the gap with Mortano.

〔Example〕

FIG. 1 is a front view showing an embodiment of the present invention, and FIG. 2 (al.
, (bl 1 (C1 is w-w, xx-x in Fig. 1,
The y-y sectional view, FIGS. 3 and 4 are enlarged views of the main parts of FIG. 1. Note that parts having the same functions as those in FIG. 5, FIG. 6, and FIG. 7 are given the same symbols, and explanations thereof will be omitted. Reference numeral 20 is a perforated filling pipe with holes here and there having a constant inner diameter, and for example, a steel pipe or a vinyl chloride pipe is used. Reference numeral 20a indicates the hole s4a provided in the perforated filling pipe 20, indicating mortar spouted from the hole 20a, and 21 indicates the perforated filling pipe 2.
A bullet-shaped pig that is loaded into the 0 and moves through it.
The perforated filling pipe 2 is moved in the θ direction by the pressure of the mortar 4 sent from the rear of the perforated filling pipe 20.
It has a slightly smaller diameter than the diameter of 0.

22 is a wire attached to the rear of the pig 21. Further, 23 is a T-shaped tube for charging the pig 21, 24 is a flange, and 25 is a sealing mechanism. Furthermore, 26 is T-tube 23
29 is a reel for winding the wire 22, 27.28
are a tension meter and a distance meter attached to the reel 29. 60 is a tank for mortar 4, 31 is a mortar pump, 50 has one end connected to mortar pump 31, and the other end connected to T.
The piping 32 connected to the cross tube 22 is a flow meter for the seven barrels.

A detailed explanation of the present invention configured as above is as follows. First, the perforated filling pipe 20 is attached to the main pipe 6 and drawn into the sheath pipe 100 yen. Next, a T-shaped tube 23 with a plunge 24 for inserting the pig 21 is connected to the end of the perforated filling tube 20, and a piping 50 is connected to this T-shaped tube 23. After that, the wire 22 is pulled out from the center of the flange 24 by pushing the pig 21Y through the flange 24 provided on the 7-shaped tube 23, and then the wire 22 and the rear part of the pig 21 are joined.
Tighten the bolts on flange 24.

After the above preparations are completed, the mortar is filled in the usual way, the mortar is kneaded by a mixer (not shown), and the four pieces of mortar are pumped in the direction of the arrow by the pump 31. When the mortar 4 reaches the pig 21, the pressure of the mortar 4 pushes the pig 2
1 stops the movement of the first cause or the one shown in FIG. 3 by the brake 26. This stops the press-fitted mortar 4 from moving too much in the θ direction, so it is ejected outward (mortar 4a ejecting in the direction shown in Fig. 3) through the hole 208 provided in the perforated filling tube 20. . The injection amount of mortar 4 is read by the flow meter 62, and it is determined by the attachment of the pig 21 determined by the distance meter 28 whether or not the mortar 4 is to be fed by a predetermined volume of the gap 7 at hand. Further, the value of the tension meter 27 is continuously read to determine whether or not filling of the gap 7 of the mortar 40 is completed.

When it is determined that the filling is complete, the presser V of the wire 22 is loosened, and the pig 21 is further moved forward by a predetermined amount (60,000 times) by the pressure of the mortar 4. In this place, the perforated filling pipe 20 in the part where the mole table A is connected to Saiko (Fig. 2 (a))
The amount of the π-th mortar 4, which has a large resistance, is released from the holes 20a, and a large amount is released from the holes that are not yet filled (FIG. 2(b)). Repeat the above operation to complete mortar filling of the entire section. After charging 1 is completed, the pig 21 and wire 22 are collected.

In addition, experimental examples of the present invention are shown below.

Experimental example: The length of the anti-opening pipe is 500rIg, and the diameter of the sheath pipe is 800mm.
The diameter of the 0 main pipe is 600fl, and the volume of the gap is 110-1
The perforated filling pipe is a 50A steel pipe! used, here and there 8
I opened the φ hole T. In addition, air milk, which is a type of mortar, was used as the mortar.

The mortar pump had a capacity of 30 to 7 hours and completed filling in just under 4 hours. The setting time of the air milk was approximately 2 hours. The pigs should be stopped at intervals of about 5 to 10 meters.
Air milk was squirted into the gap through the hole in the perforated filling tube. The flow gradient of air milk is about 6 degrees, and the distance from the beginning of the flow of air milk to the point where the pipe is already filled to the top is about 8 m, so only air milk should not be too far ahead of the pig. Ta. The control of the pig was determined mainly based on the flow rate.

〔Effect of the invention〕

As is clear from the above invention, the present invention has the following remarkable effects.

(1) Do not disturb the mortar in the gap that was filled immediately before (filling can be continued).Therefore, there is no time restriction due to mortar condensation.

(2) This method can be applied even to sheath pipes with small diameters that cannot be accessed by workers, or extremely long sheath pipes.

(3) This method can be implemented even with a small pump because there is no time restriction due to setting of mortar. Therefore, there is no problem in obtaining electricity and water.

(4) Since only one perforated filling pipe is required, there is less need to attach it to the main pipe.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the present invention, and FIG. 2 (al.
, (bl, (C1 is w-w, xx-x in Fig. 1,
The y-y cross-sectional view, Figures 3 and 4 are enlarged views of the main parts of Figure 1, and Figures 5 (al, (bl) are examples of the conventional gap filling method for double pipes! A front view and its Side view, No. 6
The figure is a front view showing another example of the conventional gap filling method for double pipes, and Figure 7 (al, (bl) is another example of the conventional gap filling method for double pipes! 2 is a sectional view, 4... Mortar, 6... Main pipe, 7... Gap, 20
... Hole filling tube, 20a... Hole, 21... Pig, 22... rHy ear, 100... Sheath tube.

Claims (1)

[Claims] In a double pipe gap filling method that fills the gap between a sheath pipe laid by a propulsion method and a main pipe drawn into the center of the sheath pipe, a perforated filling pipe is attached to the main pipe and drawn into the sheath pipe. A pig with a wire bonded to the rear is inserted, mortar is forced from the rear of the pig, the pressure advances the pig a predetermined distance, and after stopping at a predetermined position, the gap is filled with the hole. The mortar is ejected from the hole in the pipe, and after the completion of filling the gap with the mortar, the pig is further advanced and the operation is repeated to fill the gap in the entire interval with the mortar. A method for filling gaps in double pipes, which is characterized by: