JP4501311B2 - Grout filling method around buried pipe - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a grout filling method around a buried pipe, and more specifically, when a new pipe is laid and rehabilitated in the underground gap after the existing buried pipe is removed, the underground gap around the new pipe is provided. The present invention relates to a grout filling method around a buried pipe in which an inner gap is filled with grout.
[0002]
[Prior art]
Conventionally, when existing buried gas pipes and sewage pipes are replaced with new pipes by the non-opening method, shafts are formed on both ends of the existing buried pipes to be renewed, and existing pipes are installed from one of these shafts. A technique is well known in which a buried pipe is drawn using a drawing crushing device and the like, and a new pipe is inserted from the other shaft and rehabilitated simultaneously with the drawing of the existing buried pipe.
[0003]
When a new pipe is laid in the underground gap after removing the existing buried pipe by rehabilitation technology using such a non-open cutting method, a gap is created around the new pipe in the underground gap, and this gap is injected into the grout. Is being filled by. Conventionally, as shown in FIG. 4, as a method of filling grouts around the reconstructed new pipe, after the new pipe 1 is laid, it is stopped around the new pipe with sand bags or the like at both ends of the gap 2. A water wall 3 is installed to completely close the gap 2, and an inlet 4 that penetrates the water blocking wall is provided on one of the water blocking walls 3 on both sides, and an air vent 5 is provided on the other side.
[0004]
Thereafter, a grout injection pipe (not shown) is connected to the injection port 4, and the grout is press-fitted into a gap around the new pipe using a pump device or the like and filled. Then, when the grout that is press-fitted into the gap around the new pipe overflows from the air vent 5 provided in the other water blocking wall 3, the grout is completely filled. At that time, the grout injection is stopped. Next, the grout injection pipe is removed from the injection opening 4 and the injection opening 4 is closed, and the air vent opening 5 is also closed at the same time. Backfill.
[0005]
[Problems to be solved by the invention]
However, in such a conventional grout filling method, the finished state of the water blocking wall 3 greatly affects the grout filling performance, and if the water blocking wall 3 collapses even once during the grout filling, the water stopping performance is greatly reduced. It is very difficult to stop the water again.
[0006]
Moreover, the conventional grout filling method described above has a problem that the performance adjustment of the grout material itself is delicate and very difficult. That is, if a high fluidity grout is used, there is a high possibility that the grout will leak from the water blocking wall. Therefore, it is desirable to pump the grout at a low pressure. However, ensuring fluidity is an essential condition for pumping grout at low pressure. For this reason, it is necessary to adjust the fluidity of the grout in accordance with the performance of the water blocking wall, and there is a problem that this adjustment is very difficult.
[0007]
By the way, in the conventional grout filling method, when there is some necessity and another contractor excavates around the rehabilitation pipe at a later date, the rehabilitation pipe is covered with grout material. There is also a problem that there is a possibility that the gas pipe, sewage pipe or electrical equipment pipe) may be specified incorrectly.
[0008]
An object of the present invention is to solve such a conventional problem, and when a gray cast iron pipe or a ductile cast iron pipe is renewed to a new pipe by a rehabilitation technique by a non-open cutting method, a water blocking wall is used. Another object of the present invention is to provide a grout filling method around a buried pipe which efficiently and reliably fills a gap around the buried pipe which is a new pipe.
[0009]
Further, another object of the present invention is to provide an area around a buried pipe that makes it possible to easily identify the existence and type of the newly installed pipe when another contractor excavates the new installed pipe at a later date. It is to provide a grout filling method.
[0010]
[Means for Solving the Problems]
The present invention is a grout filling method around an embedded pipe, and is configured as follows in order to solve the above-described technical problem. That is, the grout filling method around the buried pipe according to the present invention is to lay a new pipe covered with a bag-like sheet in the underground void after removing the existing buried pipe by the non-open cutting method, Injecting the grout under pressure while exhausting the air from the appropriate position of the bag-like sheet that is sealed at both ends of the new pipe, then injecting the grout when the bag-like sheet is filled with grout And the grouting port of the bag-like sheet and the air venting port for exhausting are closed.
[0011]
<Specific Configuration in the Present Invention>
The grout filling method around the buried pipe according to the present invention is composed of the above-described essential constituent elements, but it can be established even when the constituent elements are specifically as follows. The specific component is that a new pipe covered with a bag-like sheet is laid by insertion from a shaft located on one end side of the underground gap, and the grout is fixed in a sealed state at both ends of the new pipe. Pressure is injected from the grout inlet formed at one end of the bag-shaped sheet and the air inside is exhausted from the air vent formed at the other end of the bag-shaped sheet. It is characterized in that the grout injection is stopped when the water overflows.
[0012]
Further, in the grout filling method around the buried pipe according to the present invention, a new pipe covered with a bag-like sheet is inserted into the underground gap from a vertical shaft located on one end side of the underground gap. At this time, it is preferable to lay the pipe by inserting a new pipe covered with a bag-like sheet while pulling the existing buried pipe from another shaft. Further, in the grout filling method around the buried pipe according to the present invention, it is preferable to color the bag-like sheet covering the new pipe and clearly specify necessary information.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the grout filling method around the buried pipe of the present invention will be described in more detail with respect to the embodiment shown in the drawings. 1 to 3 show an implementation state of the grout filling method around the buried pipe according to one embodiment of the present invention. The grout filling method around the buried pipe according to this embodiment includes a bag-like shape from a shaft located on one end side of the underground gap in the underground gap after removing the existing buried pipe by a non-open cutting method. Inserting and laying a new pipe covered with the sheet.
[0014]
As a so-called buried pipe rehabilitation method in which a new pipe is laid in the underground void after the existing buried pipe is removed by the non-cutting method, a conventional method is used. In other words, the conventional buried pipe renewal method by the non-cutting method is used to expose the existing buried pipe 6 with a predetermined separation from the direction of the buried pipe 6, for example, about 30 to 40 m as one construction section length. The starting mine A and the reaching mine B are formed respectively.
[0015]
The start pit A is a vertical shaft for sending out the impact type propulsion machine 7 and a new pipe (for example, polyethylene pipe) 8 following the impact type propulsion machine 7, and the other reaching mine B is provided with a drawing crushing device 9. This is a shaft for sequentially crushing the extracted existing buried pipe 6. Further, a tensile steel material 10 such as a PC steel rod and a PC steel wire inserted into the existing buried pipe 6 has one end connected to the head of the impact type propulsion machine 7 and the other end drawn to the drawing and crushing device 9. It is restrained and held by.
[0016]
The impact type propulsion unit 7 includes an impact vibration oscillator, and this impact vibration oscillator applies impact vibration to the existing buried pipe 6 to cut off the friction between the existing buried pipe 6 and the surrounding ground. The propulsion unit 7 is a well-known device. On the other hand, the drawing and crushing device 9 arranged in the reaching pit B is already well known as disclosed in, for example, Japanese Patent Application Laid-Open No. 2000-74262. The impact type propulsion device 7 is pulled through the tensile steel material 10 by the jacking operation of the drawing crushing device 9, and the existing buried pipe 6 is slowly drawn out to the arrival mine B side.
[0017]
In the reaching mine B, the existing buried pipe 6 drawn out is crushed sequentially, and the joints 6a, 6a... Appearing for each unit buried pipe length are crushed by a joint crushing apparatus attached to the drawing crushing apparatus 9. The required pulling force by the pulling and crushing device 9 is a hole substantially equivalent to the outer diameter of the joint 6a over the buried section of the existing buried pipe 6 after the large-diameter joint 6a has moved by the unit buried pipe length. Since the underground gap portion 2 is formed, the subsequent pulling force can be extremely small.
[0018]
In this way, the existing embedded pipe 6 is pulled out by pulling the impact type propulsion device 7 through the tensile steel material 10 by the jack operation of the pulling and crushing device 9, and the impact thruster 7 is pulled along with the extraction of the existing embedded pipe 6. Also, a new polyethylene pipe (new PE pipe) 8 having one end connected through the swivel 11 is also drawn from the start pit A into the underground gap 2.
[0019]
The new PE pipe 8 is covered with a bag-like sheet 12 over its entire length in advance. Specifically, a bag-like sheet having a diameter equal to or greater than the maximum diameter of the gap 2 expected before laying the new PE pipe 8 and a length equal to or greater than the total length of the new PE pipe 8 to be laid. 12, a new PE pipe 8 is inserted, and ends thereof are firmly bound using a band-type fastener 13.
[0020]
The bag-shaped sheet end portion is tied to the outer peripheral surface of the end portion of the new PE pipe 8 so that the inside of the bag-shaped sheet 12 is in a sealed state, and is particularly bound to such an extent that the grout does not leak from the lashed portion. It is desirable. As described above, the grout inlet 14 and the air vent 15 are provided in the vicinity of the ends of the bag-like sheet 12 secured to the ends 8a and 8b of the new PE pipe 8, respectively. .
[0021]
Then, when the new PE pipe 8 is laid in the underground space 2 after removing the existing buried pipe as shown in FIG. 2, a grout inlet provided at one end of the bag-like sheet 12 A grout injection pipe (not shown) is connected to the portion 14, and at the same time, the air vent 15 formed at the other end of the bag-like sheet 12 is opened.
[0022]
Next, the grout 16 mud by the mixer begins to be pressurized and injected into the bag-like sheet 12 through the grout injection tube, and the air in the bag-like sheet 12 is discharged from the air vent 15 along with this grout injection. Exhausted. When the grout is continuously injected into the bag-like sheet 12 from the grout inlet 14, the bag-like sheet 12 swells and adheres to the irregular inner surface shape of the underground gap portion 2 to fill the gap.
[0023]
By injecting the grout 16 into the bag-like sheet 12, the bag-like sheet 12 expands and fills the gap around the new PE pipe 8 in the underground gap portion 2, and then injects into the bag-like sheet 12. The grout that has been discharged overflows from the air vent 15 because there is no destination. This state is visually confirmed, and the injection of the grout 16 is stopped.
[0024]
Thereafter, the grout injection pipe is removed from the grout inlet 14 and closed, and the air vent 15 is also closed. Finally, the starting mine A and the reaching mine B are backfilled. When the grout 16 is filled around the new PE pipe 8 in this way, it is not necessary to make a water blocking wall with a sand bag as in the conventional case, and the flow performance of the grout needs to be adjusted with high accuracy accordingly. As a result, the construction of the grout filling can be performed very efficiently.
[0025]
As a working example, by adding an admixture to the grout material to give a high fluidity with a flow value of about 450 mm, there was an effect that the filling time could be shortened without any leakage.
[0026]
Further, according to the grout filling method around the newly installed pipe according to this embodiment, the grout 16 is filled in the bag-like sheet 12 to the end. The grout 16 does not flow into these cavities or cracks when there are cavities or cracks, or when the adjacent sewage pipes are damaged, or does not flow into the sewage pipes from the damaged part, This grout filling method is an excellent filling method in consideration of the surrounding environment.
[0027]
In addition, if the bag-shaped sheet 12 is colored and / or the necessary information such as the operator and type of the newly installed pipe is clearly indicated on the surface of the sheet, the circumference of the newly installed pipe will be changed to other in the future. When a contractor excavates for some reason, it is possible to immediately recognize the existence of a new pipe and the identification of the type (gas, water, electricity), and prevent the occurrence of breakage of the new pipe.
[0028]
In the above-described embodiment of the present invention, the PE pipe is used as the new pipe, but the present invention is not limited to the PE pipe as the new pipe, and can be applied to the case of using various pipes. Further, in the above-described embodiment of the present invention, the method for removing the existing buried pipe is an example using an impact type propulsion device or a pulling and crushing device. However, the present invention uses these devices. It is not limited to the case where a buried pipe is removed and a new pipe is buried at that location, and it goes without saying that any method can be used to remove an existing buried pipe as long as the non-cutting method is used.
[0029]
【The invention's effect】
As described above, according to the grout filling method around the buried pipe of the present invention, it is not necessary to make a water blocking wall with a sand bag as in the prior art, and accordingly, the flow performance of the grout needs to be adjusted with high accuracy. As a result, the grout filling can be performed very efficiently, and the grout filling can be performed quickly.
[0030]
Further, according to the grout filling method around the new pipe according to the present invention, the grout is filled in the bag-like sheet to the last, so if there is a cavity or crack in the underground void around the new pipe. The grout does not flow into these cavities or cracks, or if the adjacent sewer pipe is damaged, or does not flow into the sewer pipe from the damaged part. It is an excellent filling method considering the environment.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view schematically showing an implementation state of a grout filling method around a newly installed pipe according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view schematically showing a construction state subsequent to the state of implementation of the grout filling method around the new pipe according to the embodiment of the present invention shown in FIG. 1;
3 is a cross-sectional view schematically showing a construction state further following the state of implementation of the grout filling method around the newly installed pipe according to one embodiment of the present invention shown in FIG. 2. FIG.
FIG. 4 is a cross-sectional view schematically showing an implementation state of a conventional grout filling method around a newly installed pipe.
[Explanation of symbols]
2 Underground void 6 Existing buried pipe 8 New pipe 12 Bag-shaped sheet 13 Fastener 14 Grout inlet 15 Air vent 16 Grout material

Claims (4)

Laying a new pipe covered with a bag-like sheet in the underground gap after removing the existing buried pipe by the non-opening method, and then the bag-like shape fixed in a sealed state at both ends of the new pipe The grouting of the bag-like sheet is carried out by pressurizing and injecting the grout from a proper position of the sheet, and then, when the bag-like sheet is filled with the grouting, the grouting is stopped. A grout filling method around a buried pipe, which consists of closing an inlet and an air vent for exhaust. The bag in which the new pipe covered with the bag-like sheet is laid by insertion from a shaft located on one end side of the underground gap, and the grout is fixed to both ends of the new pipe in a sealed state Pressure is injected from the grout inlet formed at one end of the sheet-like sheet and the air inside is exhausted from the air outlet formed at the other end of the bag-like sheet. 2. The grout filling method around the buried pipe according to claim 1, wherein the grout injection is stopped when the grout overflows. When the new pipe covered with the bag-like sheet is inserted into the underground gap from the shaft located on one end side of the underground gap, the existing buried pipe is replaced with another vertical shaft. The grout filling method around the buried pipe according to claim 2, wherein the new pipe covered with the bag-like sheet is inserted while being pulled out from the bag. The grout filling method around the buried pipe according to any one of claims 1 to 3, wherein the bag-like sheet covering the new pipe is colored and necessary information is specified.

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