JP2004270155A - Water stopping material injection method and levee body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water stopping material injection method and a levee body, efficiently and economically performing water stopping injection by a simple piping method in cement milk injection requiring water-tightness. <P>SOLUTION: With a grout pipe 33 set in a grout hole 13 formed in a hydraulic iron pipe 3, filling concrete 17 is placed between the hydraulic iron pipe 3 and the levee body concrete 17, and the inside of the grout pipe 33 is drilled. Subsequently, a forked pipe 39 is connected to the grout pipe 33, and an evacuate pipe 59 is set in the grout pipe 33 and the forked pipe 39. While air and water 57 are extracted from the evacuation pipe 59, the space between the filling concrete 17 and the levee body concrete 1 is filled with a water stopping material 63. After the end of filling the water stopping material, the end of the evacuation pipe 59 is blocked up by caulking 65, and the forked pipe 39 is removed. Further, the evacuation pipe 59 is cut at the position of the hydraulic iron pipe 3, and a lid 67 is set in the grout hole 13. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a method for injecting a waterproof material and a bank.
[0002]
[Prior art]
Conventionally, when a new member is provided in an existing dam, it is necessary to increase the water stoppage and water tightness between the existing portion and the new portion (for example, see Patent Document 1). When adding a penstock to the existing dam, cement milk will be injected around the concrete as a measure to stop water between the existing dam and the concrete. When injecting cement milk, as in joint grouting of a dam, pipes such as a supply pipe, a return pipe, and a washing pipe are buried, and the cement milk is injected after the hardened concrete is hardened. In this case, since the injection pipe can be planned according to the gap, the cement milk can be reliably filled.
[0003]
[Patent Document 1] JP-A-11-117265
[0004]
[Problems to be solved by the invention]
However, in cement milk injection such as joint grouting, installation of complicated injection pipes causes a situation in which concrete is difficult to fill when stuffing concrete.
[0005]
The present invention has been made in view of such a problem, and an object of the present invention is to efficiently and economically stop water by using a simple piping method in cement milk injection where water tightness is required. It is an object of the present invention to provide a waterproofing material injection method and an embankment that can be injected.
[0006]
[Means for Solving the Problems]
A first invention for achieving the above-mentioned object is a step (a) of excavating existing concrete and installing a pipe having a plurality of holes, and forming a pipe through a part of the plurality of holes. (B) installing a stuffed concrete around, (c) forming a passage through the stuffed concrete from a part of the plurality of holes in the pipe, and (c) from the inside of the pipe, (D) connecting a forked pipe to the forked pipe, inserting a degassing pipe into the forked pipe and the passage (e), and discharging the air from the degassing pipe to the existing concrete and the filled concrete. And (f) injecting a water-stopping material from one opening of the bifurcated pipe.
[0007]
The water stopping material is mortar, cement milk, or the like. After the step (f), a step (g) of removing a part of the air release pipe and the forked pipe and covering a hole provided in the pipe may be further provided.
[0008]
In the passage, for example, before installing the stuffed concrete in the step (b), a water-stopping material injection pipe is attached to a part of the plurality of holes of the pipe, and the inside of the water-stopping material injection pipe is inserted in the step (c). It is formed by drilling. Alternatively, in the step (c), the crushed concrete is formed through a part of the plurality of holes provided in the pipe.
[0009]
The forked pipe includes, for example, a mouth pipe connected to the passage, a forked injection pipe connected to the mouth pipe, and the like. The passage and the forked pipe are connected using, for example, a thread cutting process. The existing concrete is, for example, a dam body. The air release pipe is cut off near the surface of the penstock and removed. The lid that closes the hole is, for example, threaded.
[0010]
In the first invention, existing concrete is excavated, a pipe having a plurality of holes is installed, and the stuffed concrete is installed around the pipe through a part of the plurality of holes. Then, after forming a passage penetrating the packed concrete from a part of the plurality of holes of the pipe, a forked pipe is connected to the passage from the inside of the pipe, and an air release pipe is inserted into the forked pipe and the passage. Next, a water-stopping material is injected from one opening of the forked pipe between the existing concrete and the filled concrete while discharging from the air release pipe.
[0011]
According to a second aspect of the present invention, there is provided a bank body wherein the water-stopping material is injected by the water-stopping material injection method of the first invention.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view of the embankment concrete 1 in which the stuffing concrete 17 is installed around the penstock 3, and FIG. 2 is a cross-sectional view of the vicinity of the penstock 3 when the stuffing concrete 17 is filled. FIG. 2 is an enlarged view of the portion shown in FIG.
[0013]
As shown in FIG. 1, in order to install the penstock 3 on the dam concrete 1 of the dam, first, a temporary deadline 21 is installed on the bank 19 side of the dam concrete 1. Then, a horizontal hole 5 is excavated in the embankment concrete 1. Then, the penstock 3 is installed in the hole 5.
[0014]
The penstock 3 is composed of a plurality of iron pipes. As shown in FIGS. 1 and 2, the penstock 3 includes a concrete casting hole 7, a concrete casting hole 11, a grout hole 9, a grout hole 13 which is a hole for injecting a waterproof material according to the present invention, and an air vent hole. 15 An iron plate for reinforcement (such as the iron plate 34 in FIG. 3) is welded to the outside of the penstock 3 around these holes.
[0015]
As shown in FIG. 2, the concrete casting holes 7 are provided, for example, at the bottom and the side of the penstock 3. The concrete casting hole 11 is provided, for example, at the top end of the penstock 3. The concrete placing holes 7 and the concrete placing holes 11 are provided at intervals suitable for placing the concrete filling 17.
[0016]
A concrete casting plug 27 is installed in the concrete casting hole 7. A concrete casting pipe 31 is installed in the concrete casting hole 11. The material of the concrete casting plug 27 and the concrete casting pipe 31 is steel or the like. The diameter of the concrete casting plug 27 and the concrete casting pipe 31 is set to a size that allows the concrete filling 17 to be easily cast.
[0017]
The grout hole 9 is provided, for example, at the bottom of the penstock 3. The grout hole 13 is provided, for example, at the top end or both shoulders of the penstock 3. This is because it is difficult for the clogging concrete 17 to be filled into the top end and the both shoulders. The grout hole 9 and the grout hole 13 are provided at intervals suitable for filling the water blocking material 63 (FIG. 9).
[0018]
A grout plug 29 is provided in the grout hole 9. The grout hole 13 is provided with a grouting pipe 33 which is a water-stopping material injection pipe. The material of the grout plug 29 and the grout pipe 33 is made of steel or the like. The diameters of the grout plug 29 and the grout pipe 33 are set to be large enough to easily inject the waterproof material.
[0019]
The air vent hole 15 is provided at the top end of the penstock 3. An air release pipe 35 is provided in the air release hole 15. The air release pipe 35 is made of steel or the like. The air bleeding pipes 35 are provided at intervals suitable for bleeding air from between the penstock 3 and the inner peripheral surface of the hole 5 at the time of placing the filling concrete 17.
[0020]
After installing the penstock 3, the concrete casting plug 27, the concrete casting pipe 311, the grout plug 29, the grout pipe 33, and the air vent pipe 35, the gap between the penstock 3 and the inner peripheral surface of the hole 5 is set. Is filled with concrete 17 which is packed. When filling the stuffed concrete 17, a shutter valve (not shown) is attached to the concrete casting plug 27 and the concrete casting pipe 31, and as shown by the arrow B in FIG. Concrete is poured from the 23 side.
[0021]
The air replaced with the stuffed concrete 17 is discharged into the pipe 23 from between the penstock 3 and the inner peripheral surface of the hole 5 through the air release pipe 35 as shown by an arrow C in FIG. . The shutter valve (not shown) is removed after the compacted concrete 17 has hardened.
[0022]
As shown in FIG. 2, the grouting pipe 33 is installed such that the end on the side of the embankment concrete 1 is located in the space 25 formed between the stuffed concrete 17 and the embankment concrete 1. After the concrete 17 in the grout pipe 33 has reached a predetermined strength, it is removed using a jack hammer drill or the like. Thereby, a passage in the grout pipe 33 is secured. At the lower part of the penstock 3, a space 25a may be formed between the lower surface of the penstock 3 and the compacted concrete 17.
[0023]
FIG. 3 is an enlarged sectional view of the forked pipe 39 and the grout pipe 33. As described above, the end of the grout pipe 33 on the side of the embankment concrete 1 is located in the space 25 created between the stuffed concrete 17 and the embankment concrete 1. Further, an iron plate 34 for reinforcing the periphery of the grout hole 13 is welded to the outside of the penstock 3. A threading process 49 is applied to the inner peripheral surface of the end of the grout pipe 33 on the penstock 3 side.
[0024]
The forked pipe 39 includes a mouth pipe 35, a forked injection pipe 37, and the like. The mouth pipe 35 is a pipe for extending the grout pipe 33. A threading process 51 is applied to the outer peripheral surface of the end of the mouth tube 35 on the side connected to the grout pipe 33. At the other end of the mouth tube 35, a fastening nut 45 and a rubber packing 41 for fixing the injection tube 37 to the mouth tube 35 are provided. The mouth tube 35 is made of steel or the like.
[0025]
The injection pipe 37 is a pipe for injecting grout into the mouth pipe 35 and the grout pipe 33, and has a branch pipe 38 for installing a water-stopping material injection valve 61 (FIG. 6). At the end of the injection pipe 37, a fastening nut 47 and a rubber packing 43 for fixing the air release pipe 59 (FIG. 6) to the injection pipe 37 are provided. The injection pipe 37 is inserted into the inside of the mouth pipe 35 via a rubber packing 41, and is fixed to the mouth pipe 35 by a tightening nut 45. The material of the injection pipe 37 is made of steel or the like.
[0026]
After the concrete filling 17 was cast and the inside of the grout pipe 33 was drilled, the forked pipe 39 in which the mouth pipe 35 and the injection pipe 37 were integrated was used as shown by an arrow D in FIG. Connect to pipe 33. In order to connect the grout pipe 33 and the forked pipe 39, a threading process 49 performed on the grout pipe 33 and a threading process 51 performed on the mouth tube 35 are screwed together.
[0027]
FIG. 4 is a cross-sectional view around the penstock 3 before grout filling. The inner peripheral surface of the lower end of the concrete casting pipe 31, the inner peripheral surface of the lower end of the air vent pipe 35, the inner peripheral surface of the concrete casting plug 27, the outer peripheral surface of the lid 53, and the outer peripheral surface of the lid 55 Is threaded in advance. At an appropriate time after the hardening of the packed concrete 17, as shown in FIG. 4, a lid 53 is screwed into the concrete casting pipe 31 and the concrete casting plug 27 from which the shutter valve (not shown) has been removed. Then, the concrete casting hole 11 and the concrete casting hole 7 are closed. Further, the lid 55 is screwed into the air vent pipe 35 to close the air vent hole 15.
[0028]
After connecting the grout pipe 33 and the forked pipe 39 as shown by the arrow D in FIG. 3, an air vent pipe 59 is installed as shown in FIG. As shown in FIG. 6, the air release pipe 59 is inserted into the injection pipe 37 via the rubber packing 43, and is fixed to the injection pipe 37 by a tightening nut 47. The distal end of the air release pipe 59, that is, the end on the hole 5 side is cut obliquely and inserted until it comes into contact with the inner peripheral surface of the hole 5. The air release pipe 59 is made of a poly hose or the like.
[0029]
Before and after the installation of the air vent pipe 59, a water-stopping material injection valve 61 is installed in the branch pipe 38 of the forked pipe 39. Then, water 57 is injected from the water-stopping material injection valve 61 into the space 25 (FIG. 3) via the forked pipe 39 and the grout pipe 33. The air in the space 25 replaced with the water 57 is discharged from the air release pipe 59 into the pipe 23.
[0030]
FIG. 5 is a cross-sectional view near the penstock 3 at the time of grout injection, and FIG. 6 is an enlarged cross-sectional view near the grout pipe 33 at the time of water-stopping material 63 injection. FIG. 6 is an enlarged view of a portion indicated by G in FIG. In the upper part of the penstock 3, after filling the space 25 with water 57, a water-stopping material 63 is injected from a water-stopping material injection valve 61 as shown by an arrow E in FIGS. 5 and 6. At the lower part of the penstock 3, as shown by an arrow E in FIG. 5, a water-stopping material 63 is injected from the grout plug 29 into the space 25a (FIG. 4). The water stopping material 63 is, for example, cement milk or the like.
[0031]
As shown in FIG. 6, in the grouting pipe 33 and the forked pipe 39, the water-stopping material 63 sent from the water-stopping material injection valve 61 in the direction shown by the arrow E becomes the branch pipe 38, the injection pipe 37, and the mouth pipe 35. , Through the grout pipe 33 to the space 25 filled with water 57. The water 57 replaced with the water stopping material 63 is discharged from the air vent pipe 59 as shown by an arrow F.
[0032]
FIG. 7 is an enlarged cross-sectional view of the vicinity of the grout pipe 33 after the injection of the water stopping material 63 is completed. When the injection of the water stopping material 63 is continued as shown in FIG. 6, after all the water 57 is replaced with the water stopping material 63, the water stopping material 63 is discharged in the direction shown by the arrow F from the air vent pipe 59. After confirming that the water stopping material 63 has come out of the air vent pipe 59, as shown in FIG. 7, the end of the air vent pipe 59 is closed using a caulking 65. After the waterproof material 63 reaches the predetermined strength, the forked pipe 39 is removed. Further, the air release pipe 59 is cut in the vicinity of the surface position of the penstock 3.
[0033]
FIG. 8 is a cross-sectional view of the embankment concrete 1 in which the waterproofing material 63 is filled around the packed concrete 17, and FIG. 9 is a cross-sectional view of the vicinity of the penstock 3 after the filling of the waterproofing material 63. FIG. 9 is an enlarged view of a portion indicated by H in FIG. The grout pipe 33 is subjected to a threading process 49 (FIG. 3). The inner peripheral surface of the grout plug 29, the outer peripheral surface of the lid 67, and the outer peripheral surface of the lid 66 are also threaded (not shown).
[0034]
After removing the forked pipe 39 and a part of the air vent pipe 59, as shown in FIG. 9, the lid 67 is screwed to the grout pipe 33 to close the grout hole 13. Further, the lid 66 is screwed into the grout plug 29 to close the grout hole 9. Then, as shown in FIG. 8, the water stopping process between the penstock 3 and the embankment concrete 1 is completed.
[0035]
As described above, in the first embodiment, the grouting pipe 33 as the water-stopping material injection pipe is installed in the grout hole 13 as the water-stopping material injection hole provided in the penstock 3. After the concrete 17 is cast, the forked pipe 39 and the air release pipe 59 are connected to the grout pipe 33. Thus, an efficient and economical grout pipe can be installed, and a complicated injection pipe such as a joint grout is not required. In the first embodiment, it is possible to surely stop the water between the stuffed concrete 17 and the embankment concrete 1 while reducing the obstacle at the time of placing the stuffed concrete 17 and ensuring the filling property.
[0036]
In addition, by closing the grout hole 13 and the like installed in the penstock 3 in advance with the screw 67 and the like after the grout injection is completed, the working efficiency and the finishing accuracy can be improved.
[0037]
Next, a second embodiment will be described. In the second embodiment, similarly to the first embodiment, concrete stuffing 17 is cast around the penstock 3 installed in the hole 5 provided in the embankment concrete 1. However, when casting the stuffed concrete 17, the grouting pipe 33 shown in FIG.
[0038]
FIG. 10 shows a diagram in which a forked pipe 39 a is installed in the passage 69. In the second embodiment, after the stuffed concrete 17 reaches a predetermined strength, the passage 69 is bored at the grout hole 13 of the penstock 3 by boring. Then, as shown in FIG. 10, the bifurcated pipe 39a is connected to the passage 69 by caulking with the early-strength cement 71 or the like.
[0039]
The forked pipe 39a has substantially the same configuration as the forked pipe 39 (FIG. 6) used in the first embodiment, and includes a mouth pipe 35a, an injection pipe 37 having a branch pipe 38, and the like. The forked pipe 39a differs from the forked pipe 39 only in that the end of the mouth pipe 35a is not threaded.
[0040]
After connecting the forked pipe 39a to the passage 69, the air vent pipe 59 penetrating the forked pipe 39a and the passage 69 is installed. The air release pipe 59 is inserted into the injection pipe 37 via the rubber packing 43, and is fixed to the injection pipe 37 by a tightening nut 47. The distal end of the air release pipe 59, that is, the end on the hole 5 side is cut obliquely and inserted until it comes into contact with the inner peripheral surface of the hole 5. The air release pipe 59 is made of a poly hose or the like.
[0041]
Further, a water blocking material injection valve 61 is installed in the branch pipe 38 of the forked pipe 39a. Then, in the same manner as in the first embodiment, the water 57 and the water-stopping material 63 are sequentially injected from the water-stopping material injection valve 61 through the forked pipe 39a and the passage 69 in the direction indicated by the arrow E. The water stopping material 63 is, for example, cement milk or the like. As the water stopping material 63 is injected, air and water are discharged from the air vent pipe 59 in the direction shown by the arrow F.
[0042]
As shown in FIG. 10, the injection of the water-stopping material 63 is continued, and after confirming that the water-stopping material 63 has come out from the air vent pipe 59 in the direction shown by the arrow F, air is swaged using a caulking (not shown). The end of the extraction tube 59 is closed. Then, after the waterproof material 63 reaches a predetermined strength, the forked pipe 39a is removed, and the air vent pipe 59 is cut near the surface position of the penstock 3. Further, a cover (not shown) is provided in the grout hole 13 by threading to complete the water stoppage between the penstock 3 and the embankment concrete 1.
[0043]
As described above, in the second embodiment, after the passage 69 is drilled in the stuffed concrete 17 using the grout hole 13 which is a hole for injecting the water-stopping material provided in the penstock 3, the passage 69 Is connected to the forked pipe 39a and the air vent pipe 59 and the like. Thus, an efficient and economical grout pipe can be installed, and a complicated injection pipe such as a joint grout is not required. In the second embodiment, it is possible to surely stop the water between the stuffed concrete 17 and the embankment concrete 1 while reducing the obstacle at the time of placing the stuffed concrete 17 and ensuring the filling property.
[0044]
Further, by closing the grout hole 13 previously set in the penstock 3 with a screw-cut lid (not shown) after the grout injection is completed, it is possible to improve work efficiency and finish accuracy.
[0045]
In the first and second embodiments, cement milk is used as the water stopping material 63, but other materials such as mortar may be used. The diameter of the pipes such as the grout pipe 33 and the forked pipe 39, and the passage 69 and the forked pipe 39a are appropriately determined depending on the type of the waterproof material.
[0046]
Further, the installation positions of the grout holes 13 are not limited to those shown in FIG. It is sufficient that at least one grout pipe 33, fork pipe 39, and air release pipe 59, or at least one passage 69, fork pipe 39a, and air release pipe 59 are provided for one gap.
[0047]
Furthermore, when closing the various holes, the lid was screwed to the threaded plug or pipe, but the method of closing the holes is not limited to this. For example, in the second embodiment, after removing the early-strength cement 71, an iron plate may be welded to the penstock 3 to close the grout hole 9.
[0048]
【The invention's effect】
As described in detail above, according to the present invention, in a cement milk injection in which water tightness is required, a simple piping method, a water shutoff material injection method capable of efficiently and economically injecting water, and Can provide levee body.
[Brief description of the drawings]
1 is a cross-sectional view of embankment concrete 1 in which packing concrete 17 is installed around penstock 3 [FIG. 2] A cross-sectional view of penstock 3 near filling concrete 17 [FIG. Enlarged cross-sectional view of grout pipe 33 [FIG. 4] Cross-sectional view near penstock 3 after filling concrete 17 [FIG. 5] Cross-sectional view near penstock 3 during grout injection [FIG. FIG. 7 is an enlarged cross-sectional view of the vicinity of the grout pipe 33 after the injection of the water-stopping material 63 is completed. FIG. Sectional view of embankment concrete 1 [FIG. 9] Sectional view near penstock 3 after filling with waterproof material 63 [FIG. 10] View of forked pipe 39 installed in passage 69 [Description of reference numerals]
1… embankment concrete 3… penstock 5… holes 7, 11… concrete casting holes 9, 13… grout holes 15… air vent holes 17… concrete filled 25 Space 33 Grout pipe 35 Mouth pipe 37 Injection pipe 38 Branch pipe 39, 39a Bifurcated pipe 49, 51 Thread cutting 53, 55 , 66, 67 ... lid 59 ... air vent pipe 61 ... water stop material injection valve 63 ... water stop material 65 ... caulking 69 ... passage

Claims (8)

Excavating existing concrete and installing a pipe with a plurality of holes; (a)
(B) installing a stuffing concrete around the pipe through a part of the plurality of holes;
(C) forming a passage through the packed concrete from a part of the plurality of holes of the pipe;
Connecting (d) a bifurcated pipe to the passage from inside the pipe;
(E) inserting an air vent tube into the forked tube and the passage;
A step (f) of injecting a water-stopping material from one opening of the forked pipe between the existing concrete and the stuffed concrete while discharging from the air vent pipe;
A method for injecting a water-stopping material, comprising: The method according to claim 1, further comprising the step (g) of removing a part of the air vent pipe and the bifurcated pipe, and covering a hole of the pipe. The passage is provided with a water-stop material injection pipe attached to a part of the plurality of holes of the pipe before the installation of the stuffed concrete, and drilling the inside of the water-stop material injection pipe after the installation of the stuffed concrete. The method according to claim 1, wherein the method is formed. The method according to claim 1, wherein the passage is formed by drilling the packed concrete through a part of a hole of the pipe after installing the packed concrete. A mouth pipe connected to the passage,
A bifurcated injection tube connected to the mouth tube,
2. The method for injecting a water-stopping material according to claim 1, comprising: The method of claim 1, wherein the lid is threaded. The method according to claim 1, wherein the existing concrete is a dam body. A dam body, wherein a water-stopping material is injected by the water-stopping material injection method according to any one of claims 1 to 7.

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