JP5986471B2 - Filling method in conduit - Google Patents

Description

The present invention relates to a method for filling a conduit, and more particularly to a method suitable for filling a conduit buried in the ground.

Numerous conduits are buried in the ground to form conduits for various uses such as modern water and sewage, gas, electricity, communications, and the like. When these underground pipes are no longer used for reasons such as aging, it is necessary to fill the inside of the pipe with mortar and fluidization. For this purpose, a filling port is provided at the upstream end of the pipe line, a reaching port is provided at the downstream end of the pipe line, and a filler having fluidity is sent from the filling port toward the downstream side. A method of filling with the filler is employed. In this type of in-conduit filling method, as shown in Patent Documents 1 and 2, the filler is pressurized from the upstream filling port with a pump and fed into the pipe line, so that the filling material reaches the downstream arrival port. Is disclosed. Further, Patent Documents 3 and 4 show a method of sending a filler from a filling port to the reaching port by sucking the filling material at the filling port from a downstream reaching port with a vacuum pump or the like.

  On the other hand, in many buried conduits, there is an overhanging portion that rises after descending from the upstream to the downstream, and an overhanging portion that descends after rising. Hereinafter, in this case, when calling the two without distinction, they are referred to as “overhead”. In these crossover portions, if only a fluid filler is sent downstream from the filling port by the pressure feeding or suction, a void may remain in the crossover portion or a pipe line in the vicinity thereof. This has been confirmed by the inventors of the present application. Such voids remain even after it has been confirmed that the filler has been sufficiently discharged from the arrival port, and this void cannot be eliminated by the conventional method, and this void remains. If the filling work is completed as it is, the inside of the buried pipe may be crushed from the gap, which may cause the road to collapse.

JP 2000-145400 A JP 2007-309384 A JP-A-53-13286 Japanese Patent No. 4920630

In the present invention, when there is an overhanging portion that rises after descending from the upstream to the downstream in the middle of the conduit to be buried, or an overhanging portion that descends after rising, the voids in these bend portions It is an object of the present invention to provide a method for filling in a conduit that can suppress the occurrence of the above.

The present invention provides a filling port at the upstream end of the pipe line, a reaching port at the downstream end of the pipe line, and sends a filler having fluidity from the filling port toward the downstream side. The above-mentioned problem is solved by providing a method for filling in a conduit with a filler, characterized by the following points.

In the present invention, the pipe line is provided with a bend portion that is at least partially curved, and a forward feed process in which the filler is sent downstream from the filling port, and the pipe sent in the pipeline by the forward feed process. By performing the reverse feeding step of moving the filler upstream, the generation of voids in the bend portion is suppressed.

The filler includes mortar, and the bend portion is at least one of an overhanging portion that rises after descending and an upward portion that descends after rising, from upstream to downstream. The forward feeding step performs at least one of a pressure feeding step and a suction step, and the reverse feeding step performs at least one of a reverse pressure feeding step and a reverse suction step. The pressure feeding step is to send the filler to the downstream side of the bend portion by applying pressure to the filler from the filling port and feeding it into the pipe line, and the suction step includes By sucking the filler in the filling port from the arrival port, the filler is sent downstream from the bend portion, and the reverse pressure feeding step is performed at a position downstream from the bend portion. The new filler is pumped upstream to move the filler in the bend portion sent by the forward feeding process upstream, and the reverse suction process is performed in the sequential feeding process. It is carried out as moving at least the filler in the bend part toward the upstream by sucking the filler sent into the pipe line by a process from a position upstream of the bend part. it can.

Further, the reverse feeding step is performed after confirming that the filler sent in the sequential feeding step has reached the arrival port, and at least air in the pipeline has flowed out from the upstream end. It is preferable to carry out until it is confirmed.

The present invention can change the state of the filler filled in the pipe line by the forward feeding process by performing the backward feeding process after the progressive feeding process, thereby reducing the voids. Is. Therefore, generation | occurrence | production of the space | gap in bend parts, such as an overturning part and a raising part, was able to be suppressed.

It is a side view which shows embodiment of this invention. It is a side view which shows other embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Target pipe line)
The in-conduit filling method of the present invention is to fill the inside of a pipeline for various uses such as water and sewage, gas, electricity, communication, etc. with a fluid filler, and is buried in the ground. Although the main object is a conduit, a similar filling method can be used for above-ground and aerial conduits. The pipe is composed of one or a plurality of pipes, and the material of these pipes is generally synthetic resin, metal, concrete, etc., but the method of the present invention is applied regardless of the material. can do.

This pipe line is provided with a curved bend portion 10 at least at a part thereof. As shown in FIG. 1, the bend portion 10 may be an overlying portion 11 that rises after descending from upstream to downstream, or descends after raising as shown in FIG. 2. The overpass 12 may be used, and the present invention can also be applied to a pipeline that curves while maintaining a horizontal state. In addition, in the following description, when it is not necessary to distinguish between the overhanging portion 11 and the overturning portion 12, they are collectively referred to as a bend portion 10.

An example of the pipeline will be described with reference to FIGS. 1 and 2. This pipe has an upstream on the left side and a downstream on the right side. The straight pipe 13, the first bend pipe 14, and the straight pipe arranged diagonally are arranged from the upstream to the downstream. Pipe 15, second bend pipe 16, straight pipe 17 arranged horizontally, third bend pipe 18, straight pipe 19 arranged diagonally, fourth bend pipe 20, straight pipe 21 arranged horizontally Each tube is connected in the order of. In addition, each pipe | tube does not need to be one and may connect several.
In FIG. 1, the section of the bend pipe 14 to the bend pipe 20 constitutes the overhanging part 11, and in FIG. 2, the section of the bend pipe 14 to the bend pipe 20 constitutes the raising part 12.

(Filler)
Various fillers having various fluidities such as mortar such as slurry mortar and soil mortar, fluidized soil, and synthetic resin can be used as the filler. As this filler, one having a flow value of about 350 to 450 mm is suitable. However, the present invention is not limited to this, and the filler can be appropriately changed and implemented on the condition that pumping or suction is possible.

(Setting of filling part and reaching part)
Since the normal pipe line is arranged in the ground or the like in a continuous state, the pipe line is cut in a fixed section, the filling part 22 is set at the upstream end, and the reaching part 23 is set at the downstream end. The length of the section where the filling unit 22 and the reaching unit 23 are set may be several meters at the minimum, and depending on the pump performance at the maximum, it is considered possible up to about 700 m. Specifically, the filling portion 22 and the reaching portion 23 each seal the end of the pipeline with the sealing member 24. A filling port 25 is provided above the sealing member 24 of the filling unit 22, and a reaching port 26 is provided above the sealing member 24 of the reaching unit 23. The filling port 25 is a thin tube body into which a filler can be fed, and a closing valve is provided as necessary to allow opening and closing. The arrival port 26 is a thin tube body for discharging the reached filler or the like, and is provided with a closing valve as necessary so that it can be opened and closed. Further, as necessary, each sealing member 24 of the filling part 22 and the reaching part 23 is provided with an air vent 27 at the upper part and a water vent 28 at the lower part. The air vent port 27 and the water vent port 28 are thin tubes that can discharge air or water in the pipeline, and can be opened and closed by providing a closing valve as necessary.

(Filling into the conduit)
The filling of the conduit according to the present invention includes a forward feeding step for sending the filler downstream from the filling port 25 and a reverse feeding step for moving the filler sent into the pipe line upstream by this sequential feeding step. As a result, the bend portion 10 is also filled with less voids.

(Progressive process)
The progressive feeding process is to allow the filler to reach from the upstream filling port 25 to at least the downstream side of the bend portion 10 and preferably to the downstream reaching port 26. As a specific method thereof, a pressure feeding process and a suction process are performed. And / or at least one of them.

In the pumping process, the filler is pumped in the downstream direction by a pump (not shown) connected to the filling port 25. The type of the pump is not particularly limited, but a sand pump, a squeeze pump, or the like used for various filling operations in the field of civil engineering and construction can be used.

In the suction step, a filler hopper or mixer is connected to the filling port 25 and sucked with a pump (not shown) from the arrival port 26, so that the filler is sucked from the upstream filling unit 22, and more than the bend unit 10. The filler is sucked downstream. The type of the pump is not particularly limited, but a vacuum pump or the like used for various suction operations in the civil engineering and construction field can be used.

Since it is difficult to confirm the degree of arrival of the filler in the middle of the pipe line, it is preferable to continue the pumping process or the suction process until it can be confirmed that the filler is discharged from the arrival port 26. In this way, even if the filler is discharged from the arrival port 26, the filler is sent to the curved portion of the bend portion 10 while leaving the gap, and once the gap is formed, the path through which the filler flows. Is fixed, it becomes difficult to eliminate the gap.

(Reverse feed process)
The reverse feed process moves the filler sent into the pipeline by the sequential feed process upstream, and as a specific method thereof, at least one of the reverse pressure feed process and the reverse suction process can be adopted. .

In the reverse pressure feeding process, a new filler is pumped upstream from a position downstream of the bend unit 10, preferably from the arrival port 26. This pumping can be performed using a pump similar to the pumping step described above. When the new filler is pumped from the downstream to the upstream, the filler in the bend portion 10 sent in the progressive feeding process can be moved upstream. As a result, the path in which the filler flows in the state where the gap is formed by the progressive feeding process changes when the filler moves in the opposite direction, so that the gap can be eliminated or reduced.

In the reverse suction process, the filler sent into the pipe line in the sequential feeding process is sucked from a position upstream of the bend unit 10, preferably by connecting a suction pump to the filler unit 22, thereby removing the filler. It moves to the upstream. This suction can be performed using a pump similar to the above-described suction step. By performing the reverse suction process, the filler in a state where the gap is formed by the progressive feeding process moves by being pulled in the reverse direction, so that the gap can be eliminated or reduced.

(Combination of progressive process and reverse process)
The combination of the pressure feeding process and the suction process in the sequential feeding process, and the reverse pressure feeding process and the reverse suction process in the reverse feeding process are free, and specifically, the following combinations can be performed.

Pressure feeding process-reverse pressure feeding process, pressure feeding process-reverse suction process, pressure feeding process-reverse pressure feeding process and reverse suction process in combination, suction process-reverse pressure feeding process, suction process-reverse suction process, suction process-reverse pressure feeding process and reverse suction Combined use of processes, combined use of pumping process and suction process-reverse pumping process, combined use of pumping process and suction process-combined use of reverse suction process, pumping process and suction process-combined use of reverse pumping process and reverse suction process.

Hereinafter, in order to enhance the understanding of the present invention, examples are shown together with comparative examples, but should not be understood to be limited to these examples of the present invention.

Example 1
The following filling method was implemented with respect to the pipe line which has the overhanging part 11 shown in FIG.
Each condition is shown below.
Length of straight pipes 13 and 21: 3m
Length of straight pipes 15 and 19: 1m
Straight pipe length: 1.5m
Bending angle of bend tubes 14, 16, 18, 20: 45 degrees Diameter of each tube: 400 mm diameter
In the overhanging portion 11, water that was regarded as stored water was disposed.
Type of filler: Specific gravity of slurry mortar filler: 1.220-1.250
Flow value of filler: 400 ± 50mm
Filling breathing: 3%
Filling portion 22: The filling port 25 and the air vent port 27 are provided in the upper part, and the water drain port 28 is provided in the lower part.
Reaching portion 23: The reaching port 26 is provided in the upper portion, and the drain port 28 is provided in the lower portion.

As a progressive feeding process (pressure feeding process), the filler was pumped downstream from the filling port 25 by a mortar pump controlled by an inverter (pumping pressure 0.3 Mpa, flow rate 30 m3 / H). Along with the blowing of air from the arrival port 26 and the drainage port 28 of the arrival part 23, and after the blowout of water from the drainage port 28 is seen, the filler is filled from all the ports (the arrival port 26 and the drainage port 28). After confirming the balloon, the progressive process was completed.

As a reverse feeding process (reverse pressure feeding process), the same pump as that in the above-described progressive feeding process was used to pump the filler from the arrival port 26 toward the upstream side. As a result, the air accumulated in the upper part of the pipe was sent out, and air and filler were blown out from the air vent port 27 through the filling port 25 to complete the filling.

Test results: After 24 hours, each tube was cut at six observation points aa, bb, cc, dd, ee, and ff, and the filling state was confirmed. The filler was filled with each tube in a state where the upper surface was horizontal, and the presence or absence of voids between the upper surface of the filler and the inner surface of each tube was observed, and the porosity was determined. The porosity is obtained by measuring the distance between the upper surface of the filler and the center upper end of the inner surface of each tube, and calculating the porosity from the measurement results. Table 1 shows the average values of four locations -b, ee, and ff.

Comparative Example 1
For the pipe having 11 shown in FIG. 1, when the forward feeding process (pressure feeding process) in Example 1 is completed, the filling operation is finished, and the backward feeding process (reverse pressure feeding process) is not performed. It was.

Test result: After the elapse of 24 hours, the void ratios of four locations aa, bb, ee, and ff were calculated in the same manner as in Example 1, and the calculated values of the four locations, The average is shown in Table 1.

In Example 1, the filling state close to 100% was shown at each observation point. Moreover, compared with the comparative example 1, the porosity was reducing at each observation point, and it was confirmed that there exists an effect in suppression of generation | occurrence | production of a space | gap.

Example 2
The following filling method was implemented with respect to the pipe line which has the raising part 12 shown in FIG.
The conditions of each tube are the same as in Example 1, and only the direction of the bend tube is different. Other conditions are also the same as those in Example 1, and in the progressive feeding process (pressure feeding process), after confirming the blowing of the filler from all the ports (arrival port 26 and drainage port 28), the reverse feeding process (reverse) A pressure feeding step) was performed, and air and filler were blown out from the air vent 27 to the filling port 25, and the filling was completed.

Test results: After 24 hours, each tube was cut at 6 observation points of gg, hh, ii, jj, kk, and l-1 and the filling status was confirmed. The porosity was determined. The values at six locations are shown in Table 2, and in Example 2, it was confirmed that the porosity was small at each observation point, indicating a sufficiently good filling state.

DESCRIPTION OF SYMBOLS 10 Bend part 11 Overhead part 12 Overhead part 22 Filling part 23 Reaching part 24 Sealing member 25 Filling port 26 Reaching port 27 Air vent 28 Water vent

Claims (3)

A filling port is provided at the upstream end of the pipe line, a reaching port is provided at the downstream end of the pipe line, and a filler having fluidity is sent from the filling port toward the downstream side. In the filling method in the conduit filled with
The conduit includes a bend portion, at least a part of which is curved,
A gap in the bend portion is obtained by performing a forward feeding step of sending the filler downstream from the filling port and a reverse feeding step of moving the filler sent in the pipeline by the forward feeding step upstream. are those the occurrence of suppressing,
The bend portion is provided with at least one of an overhang portion that rises after descending from the upstream toward the downstream, and an overdraft portion that descends after the rise,
The sequential feeding step is to perform at least one of a pressure feeding step and a suction step,
The reverse feeding step performs at least one of a reverse pressure feeding step and a reverse suction step,
The pressure feeding step is to send the filler downstream from the bend portion by applying pressure to the filler from the filling port and feeding it into a pipe line.
The suction step is to send the filler downstream of the bend portion by sucking the filler in the filler port from the arrival port,
In the reverse pressure feeding step, the filler in the bend portion sent in the sequential feeding step is directed upstream by pumping the new filler upstream from a position downstream of the bend portion. Is to be moved,
In the reverse suction step, at least the filler in the bend portion is directed upstream by sucking the filler sent into the pipe line in the progressive feeding step from a position upstream of the bend portion. In- conduit filling method characterized in that it is moved . The in-conduit filling method according to claim 1 , wherein the filler is selected from the group consisting of mortar, fluidized soil, and synthetic resin . The reverse feeding step is performed after confirming that the filler sent in the sequential feeding step has reached the arrival port, and that at least air in the pipeline has flowed out of the upstream end. 3. The in-conduit filling method according to claim 1 or 2, wherein the method is performed until confirmation.