JP3845664B2 - Backfill injection device and backfill injection method - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a backfilling injection apparatus and a backfilling injection method, and more particularly, a backfilling injection apparatus for injecting and filling a backfilling material on the back surface of a tubular body formed so as to cover the inner surface of a pipe line with a backfilling interval. It relates to the backfilling method.
[0002]
[Prior art]
Conventionally, in the rehabilitation method and secondary lining method of various pipes, a tubular body is assembled from a plastic lining material so as to cover the inner surface of the pipe line, and at this time, the interval between the pipe line and the tubular body Inside is backfilled. FIG. 8 shows an example of a conventional backfill injection method, in which an injection tube c is installed in advance on the ceiling portion of the target pipeline a, and the injection tube c is formed on the back side of the tubular body b after the tubular body b is formed. I try to give back through.
[0003]
[Problems to be solved by the invention]
Cement milk is usually used as the backfill material. Cement milk is relatively viscous and begins to harden gradually over time, so the distance that can be backfilled by injection from one place is at most about 20 to 30 m. The pipeline rehabilitation method and secondary lining method are usually long-distance construction (for example, 50 to 200 m). For example, when the construction distance is 100 m, injection from three places at 25 m intervals or four places at 20 m intervals is possible. I need it. Thus, in the case of injection at 3 places, it is necessary to install 3 injection pipes of 25 m, 50 m and 75 m, and in the case of injection at 4 places, it is necessary to install 4 injection pipes of 20 m, 40 m, 60 m and 80 m. become. In this case, the total installation distance of the injection pipe reaches at least 1.5 to 2.0 times the construction distance, and it takes time to install the injection pipe, and the consumption of the injection pipe and the cost burden also increase. In addition, after the construction, the backfill material remained in the injection pipe, and the pipe was clogged, so that it could not be used effectively and had to be buried as it was.
[0004]
In addition, since the tubular body b is assembled from a plastic lining material and is not sufficiently strong in strength, if the backfilling is performed at once over the entire range, the tubular body b is formed on the tubular body due to the head pressure of the backfilling material. There is a risk of deformation, and this tendency becomes more pronounced especially when the diameter is large (800 to 5000 mm). In this case, if the backfilling is performed in stages in the radial direction, that is, in the height direction, with curing curing time, the above problem is eliminated. In order to prepare for injection filling, the inside of the injection tube c must be immediately cleaned. During this cleaning, the cleaning water flows into the backfilling material that has been placed, and dilution of the backfilling material, resulting in poor curing and curing, etc. This creates a fear of inviting.
[0005]
In addition, in existing sewer pipes, etc., there are generally pipe unevenness and meandering due to ground fluctuations, etc., in cases where water has entered from the joints and cracks of the pipe, or when the flowing sewage cannot be stopped In some cases, it is necessary to construct while draining sewage. In such a case, stagnant water remains between the assembled tubular body b and the pipe line a, and if the backfill material is injected from above, it will be dispersed and diluted in the accumulated water, resulting in poor curing and insufficient strength. There was a problem that would cause.
[0006]
The present invention provides a backfilling injection device that can reduce the time and effort required for installing the injection tube, reduce the consumption of the injection tube, and hence the installation cost, and can make effective use of the injection tube after injection filling. There is. Furthermore, the present invention is to provide a backfilling injection method capable of performing stepwise injection in the radial direction without the possibility of dilution of the placed backfilling material with cleaning water and hence the occurrence of curing curing failure. It is another object of the present invention to provide a backfilling injection method in which the backfilling material is not diluted even if there is stagnant water in the pipe and the quality does not deteriorate.
[0007]
[Means for Solving the Problems]
The present invention is an apparatus for injecting and filling a backfill material between a conduit and a tubular body assembled from a plastic lining material so as to cover the inner surface of the conduit,
An injection pipe installed over the entire length in the pipe axis direction between the pipe line and the tubular body,
(B) An injection head that is slidably fitted in the injection axis in the injection tube;
(C) a hose for supplying a backfill material to the injection head, and (d) reciprocating means for reciprocating the injection head in the tube axis direction within the injection tube, wherein the injection head opens in a radial direction. The injection pipe includes a plurality of second inlets with check valves that are arranged in parallel in the direction of the pipe axis, and includes a first inlet and one selected second inlet. The present invention relates to a backfilling injection device characterized in that the backfilling material is filled and filled in the aligned state.
[0008]
In a preferred embodiment of the present invention, the injection head is provided with a pair of slide seal rings arranged in parallel with a gap in the tube axis direction, and the first injection port is opened around the entire circumference between the seal rings. A configuration having the same configuration can be applied.
[0009]
Further, in the above-described injection head, one having a pair of packers in place of the slide seal ring can be applied.
[0010]
Furthermore, the present invention applies the backfilling injection device according to claim 1 to perform backfilling within the space between the pipe line and the tubular body, and injects the backfilling material from the lower region to the upper region. In addition, the present invention relates to a backfilling injection method characterized by proceeding stepwise with time required for curing and curing.
[0011]
Further, in the present invention, when the backfilling injection apparatus according to claim 1 is applied and backfilling is performed within the interval between the pipe and the tubular body, backfilling is injected into two places, the bottom and the ceiling of the pipe. After installing the device and injecting using the injection device installed at the bottom first, discharging the accumulated water in the pipe from both ends of the pipe, then using the injection device installed on the ceiling The present invention relates to a backfill injection method characterized by performing backfilling.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described below with reference to the accompanying drawings. In the drawings, the same reference numerals indicate substantially the same parts. As is apparent from FIG. 1 showing the outline of the device of the present invention, the device of the present invention includes an injection tube 1, an injection head 2 that is slidably fitted in the injection tube 1 in the axial direction of the tube, and the injection A hose 3 for supplying a backfill material to the head 2 and a reciprocating means such as a pulling member 4 for reciprocating the injection head 2 in the tube axis direction in the injection tube 1 are provided.
[0013]
The injection head 2 is provided with slide seal rings 5 and 5 at both ends in the slide movement direction. A first injection port 6 is opened all around between the seal rings 5 and 5, and the first injection port 6 is an injection passage 7. It is connected to the hose 3 via.
[0014]
Further, instead of the slide seal ring 5, as schematically shown in FIG. 2, a packer that can be expanded and contracted by fluid pressure can be applied. In this example, a hose having a smaller diameter (not shown) is inserted into the hose 3 and connected to the flow path 7 ′. The flow path 7 ′ is connected to the flow path 10 that opens inside the packer 11. Has been. The packer 11 is firmly crimped to the injection head via the crimping ring 12 at both ends thereof. The packer 11 expands by being pressurized by a fluid such as water or air from the flow path 10, and serves as a seal by being in close contact with the inner surface of the injection tube 1. The packer is made of rubber and contracts due to its retained elasticity when the fluid pressure is released. The structure of other parts is substantially the same as the slide seal ring system shown in FIG. The structure of this packer system is more complicated than that of the slide seal ring system. However, the packer system has characteristics such as little sliding resistance when moving through the injection tube 1 and almost no wear.
[0015]
The injection tube 1 is constituted by an extension of a standard length tube (not shown in the drawing) having a length of about 0.3 m to 3 m, for example, and each of the length tubes is provided with a check valve such as a rubber ring 8. A second inlet 9 is formed. Alternatively, instead of adding the injection pipes 1 to each other, a pipe having no injection port may be sandwiched between the required lengths. Thus, the second injection port 9 with the check valve 8 is provided in the injection tube 1 after the addition so as to be parallel to the tube axis direction at predetermined intervals, for example, every 10 m. The injection pipe can be appropriately selected from steel pipes or resin pipes such as polyvinyl chloride, polyethylene, and ABS. In particular, the resin pipe is lightweight and excellent in handleability, and has a moderate flexibility. Even so, there are advantages such as being able to be easily carried into the pipeline through the manhole opening and being able to easily follow the curve even when the pipeline is curved.
[0016]
One end of the hose 3 is connected to a backfilling material supply section (not shown) installed on the ground and the other end is connected to the injection passage 7 of the injection head 2, and the backfilling material is directed from the supply section to the injection head 2. It can be supplied.
[0017]
One end side of the pulling member 4 is fixedly attached to the injection head 2, and the other end side is wound, for example, on a winch (not shown) installed on the ground. The pulling member 4 is applied to the forward movement of the injection head 2, and the hose 3 is applied to the backward movement, for example. In addition to the hose 3, a pulling member for moving backward may be provided. When the hose 3 is also used as a pulling member for moving backward, it is preferable to increase the tensile strength of the hose 3 with a reinforcing material. Note that a wire, a piano wire, or the like may be used as the pulling member 4.
[0018]
The apparatus of the present invention can be applied to backfilling of small-diameter to large-diameter pipes, but is particularly applicable to backfilling of large-diameter pipes (for example, 800 to 5000 mm) that can be manually operated in the pipes. Useful. The case where it is applied to backfilling construction of a large-diameter pipe will be described below.
[0019]
In the apparatus of the present invention, as shown schematically in FIG. 3, the injection pipe 1 is provided in advance with an attachment fitting (not shown) such as an anchor bolt along the ceiling portion in advance over the entire length of the pipe line a to be constructed. It is attached and fixed by manual work under application, and a traction member 4 (not shown) is further passed through it. The injection tube 1 may be installed in parallel with the assembly of the tubular body b in the conduit a.
[0020]
As shown in FIG. 4, after the assembly of the tubular body b in the pipe line a is completed by applying various known means, as shown in FIG. Construction is performed. The procedure for backfilling is as follows. As described above, the injection pipe 1 of the apparatus of the present invention is installed in advance over the entire length in the ceiling portion of the pipe line a, and further, the traction member 4 is passed through the injection pipe 1. The tip of the injection head 2 is attached and fixed to the pulling member 4, and then the pulling member 4 is operated to insert the injection head 2 into the injection tube 1 together with the hose 3 connected to the rear end side. Next, the injection head 2 operates the pulling member 4 to move in the tube axis direction in the injection tube 1, and the first injection port 6 of the injection head 2 is in the second injection port 9 provided in the injection tube 1. Aligned with the selected one. Since the first inlet 6 is opened all around between the seal rings 5 and 5 or between the packers 11 and 11, the selected second inlet 9 is between the seal rings 5 and 5 or the packers 11 and 11. It suffices if it is positioned between them, and a relatively rough alignment is sufficient. The alignment state of the first inlet 6 and the second inlet 9 is shown in FIGS. 1 and 2.
[0021]
After the alignment of the first and second injection ports 6 and 9 is completed, the backfill material is fed from the supply section toward the injection head 2 via the hose 4, and the fed backfill material is the first It is injected into the backfill interval between the pipe line a and the tubular body b through the two injection ports 6 and 9. After the injection of the backfill material from one second injection port 9 is completed, the injection head 2 is moved in the tube, aligned with the other second injection port 9, and the backfill material is injected again. In the case of the packer system shown in FIG. 2, the packer is pressurized and expanded at the time of injection, and the pressure is released and the packer is contracted at the time of movement. Thus, by repeatedly selecting the second inlet 9 and injecting the backfill material, backfilling can be performed over the entire length even in the case of long-distance construction. Note that the mounting pitch of the second injection port 9 in the injection tube 1 is set according to the viscosity of the backfilling material, the curing time, etc. so that the backfilling material after the injection is in a level level level.
[0022]
In order to prevent deformation of the tubular body due to the head pressure of the backfilling material, when backfilling is performed in stages, as shown in FIG. The injection head 2 is extracted from the injection tube 1 and washed to prepare for the next injection. Since the backfill material does not remain in the injection tube 1, it is not necessary to clean the injection tube 1, and there is no possibility that the cleaning water flows into the backfill material of the first stage injection. Wait for the backing material to harden in the first stage, perform the second stage backing material by the above method, and then perform the backing material placement to the third stage in the same manner. Thus, the stepwise injection of the backfill material can be completed.
[0023]
After the filling and filling of the backfill material is completed, the filling head 2, the hose 3 and the traction member 4 are recovered and reused for the next backfilling filling. On the other hand, the injection tube 1 is left as it is at an attachment site in the pipe a, for example, a ceiling portion. Since the backfilling material does not remain in the injection tube 1 and the open state is maintained, the injection tube 1 can be effectively used as a service pipe for laying a communication cable or the like, for example.
[0024]
In existing sewage pipes, etc., pipes are generally uneven and meandering due to ground fluctuations, etc., in cases where water has entered from the joints and cracks of the pipes, or when the flowing sewage cannot be stopped There are cases where construction must be done while draining sewage. In such a case, stagnant water remains between the assembled tubular body b and the pipe line a, and if the backfill material is injected from above, it will be dispersed and diluted in the accumulated water, resulting in poor curing and insufficient strength. Will occur. In order to solve such a problem, as shown in FIG. 7, the injection pipe 1 of the device of the present invention is installed in the staying water d in the lower part of the pipe in advance, and then in the staying water d through the injection pipe 1. Inject backfill material e. In general, the backfilling material is cement milk based on bentonite and various additives to prevent breathing. In this case, the specific gravity is 1.5 or more. If the backfilling material is injected from the lower part of the pipe, it will not be dispersed and diluted in the staying water due to its specific gravity difference and viscosity, but will spread to the bottom of the pipeline while pushing up the staying water upward. At the time when the backfill level and thus the stagnant water level rises to some extent, the stagnant water is discharged from both ends of the pipe.
[0025]
Next, it is possible to complete the backfilling of the entire cross section by continuing the injection from the injection tube 1 installed in the lower part. However, generally, when the tube has a large diameter, a long injection time is required. Since the curing of the backfilling material proceeds, the injection from the bottom is finished. In that case, install an injection pipe in the upper part of the pipe in advance and inject the backfilling material from the top using the method described above to avoid the adverse effect of the stagnant water on the backfilling material. Reliable backfilling can be performed without deteriorating the quality of the material.
[0026]
Supply of the backfill material to the injection head 2 may be performed in two systems by providing two hoses 3. For example, if the main agent and the curing agent are separately supplied in two systems and mixed in the injection head 2, a rapid curing material with a curing time of several minutes to several tens of minutes is applied as the backfill material. Can do. In the case of the stepwise injection described above, if a rapid-curing backfill material is applied, the curing time required for each step injection can be shortened, and the construction efficiency can be improved. In addition, even when groundwater is infiltrated in the existing pipe line described above, it is possible to minimize dilution or outflow by intruding water by applying a rapidly curable backfill material.
[0027]
【The invention's effect】
According to the device of the present invention, since only one injection pipe need be installed regardless of the distance of the pipe line, it is possible to reduce the labor required for installation of the injection pipe and to reduce the consumption and the cost burden. After construction, the injection pipe can be effectively used as a service pipe.
Furthermore, in the backfilling injection method of the present invention, the stepwise injection of the backfilling material can be achieved easily and efficiently without fear of dilution of the cleaning water in the backfilling material, and is particularly applicable to long distance construction with a large diameter. Useful.
In addition, when stagnant water is present in the pipeline, the backfilling material is not diluted into stagnant water by installing an injection pipe at the bottom of the pipeline, so that the backfilling material is not compromised without impairing the quality of the backfilling material. Can be done.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an embodiment of the device of the present invention.
FIG. 2 is a longitudinal sectional view showing another embodiment of the device of the present invention.
FIG. 3 is a cross-sectional view schematically showing a state in which the injection pipe of the device of the present invention is installed in the pipe line.
4 is a cross-sectional view schematically showing a state in which a tubular body is formed in the conduit shown in FIG.
FIG. 5 is a longitudinal sectional view schematically showing a backfilling construction situation by application of the device of the present invention.
FIG. 6 is a cross-sectional view showing a staged injection state.
FIG. 7 is an explanatory view seen from the front side showing a state in which the backfill material is injected into the staying water by applying the apparatus of the present invention.
FIG. 8 is an explanatory view schematically showing a conventional construction method.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Injection pipe 2 Injection head 3 Hose 4 Pulling member 5 Slide seal ring 6 First injection port 7 Injection channel 8 Rubber ring 9 Second injection port 10 Packer expansion channel 11 Packer 12 Caulking

Claims (5)

An apparatus for injecting and filling a backfill material between a pipe line and a tubular body assembled from a plastic lining material so as to cover the inner surface of the pipe line,
An injection pipe installed over the entire length in the pipe axis direction between the pipe line and the tubular body,
(B) An injection head that is slidably fitted in the injection axis in the injection tube;
(C) a hose for supplying a backfill material to the injection head, and (d) reciprocating means for reciprocating the injection head in the tube axis direction within the injection tube, wherein the injection head opens in a radial direction. The injection pipe includes a plurality of second inlets with check valves that are arranged in parallel in the direction of the pipe axis, and includes a first inlet and one selected second inlet. A backfilling injection device characterized in that the backfilling material is injected and filled in the aligned state. 2. The back according to claim 1, wherein the injection head includes a pair of slide seal rings arranged in parallel with a gap in the tube axis direction, and a first injection port is opened all around between the seal rings. Infusion device. 2. The backfilling injection device according to claim 1, wherein the injection head includes a pair of packers arranged in parallel with a gap in the tube axis direction, and a first injection port is opened all around between the packers. . When applying the backfilling injection device according to claim 1 to perform backfilling within the interval between the pipe line and the tubular body, the backfilling material is injected from the lower region to the upper region and for curing and curing. A backfill injection method characterized by advancing step by step with the time required. When applying the backfilling injection device according to claim 1 and performing backfilling within the interval between the pipe line and the tubular body, the backfilling injection apparatus is installed at two places of the bottom part and the ceiling part of the pipe line, First, inject using the injection device installed at the bottom to discharge the accumulated water in the pipe from both ends of the pipe, then backfill using the injection device installed on the ceiling A backfill injection method characterized by

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