JP4010966B2 - Barrier pipe for impermeable wall installation - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dredging pipe that is embedded in a dike or the like and that is attached with a water shielding wall.
[0002]
[Prior art]
In order to prevent overflow and breakage of a dike on a river dike, there is a case where a dredger that drains the increase water to another river or a wastewater treatment plant is provided at the base of the dike.
[0003]
By the way, as shown in FIG. 10, when penetrating pipe 2 is penetrated into embankment 1, water channel W is easy to be formed along dredging pipe 2, and there is a possibility that river water may permeate when water increases.
Therefore, when the dredging pipe 2 is provided, a dredged impermeable wall 3 may be provided around the dredging pipe 2 in order to prevent water penetration. In the figure, 6 is an on-off valve, 7 is a casing of an operation handle of the on-off valve 6, and 8 is a water conduit.
[0004]
Conventionally, as shown in FIG. 11, as a non-cutting method for providing the water shielding wall 3, a plurality of vertical pipes 2, 2 that are covered with exterior concrete 2 a and divided into two in the axial direction are arranged in the circumferential direction. After connecting the liner 4 formed by dividing the liner 4 to a single vertical pipe by applying bolts 4a and 4a and propelling it to a predetermined position, the curing chemical solution is injected into the surrounding ground. When cured, the liner 4 is removed, and the portion where the impermeable wall 3 is to be provided is excavated from the inside of the pipe as shown in FIG. 12, and the split piece 3S for the impermeable wall 3 is inserted into the hollow portion 5 from the inside of the pipe. As shown in FIG. 13, it is assembled so as to form a bowl shape centered on the dredge tube 2, and then the inside of the dredge pipe 2 is sealed from the cavity portion 5, and finally a grout is injected into the cavity portion 5 to construct a water shielding wall. Things were going on. In FIG. 12, reference numeral 9 denotes inner-layer concrete, which is placed after construction of a water-impervious wall (Patent Document 1).
[0005]
[Patent Document 1]
JP-A-11-107240 [0006]
[Problems to be solved by the invention]
However, even when the ground hardening chemical solution is injected by the above method, the effect of ground improvement is often not achieved despite the injection of the chemical solution due to the location of the groundwater veins and the strength of the ground. When the portion where the impermeable wall 3 should be provided is excavated from inside the pipe, the ground of the excavated portion collapses due to groundwater or earth pressure, and the cavity 5 where the impermeable wall 3 should be provided cannot be excavated. There is a problem that subsidence can occur.
[0007]
Further, in the above construction method, after the impermeable wall 3 is assembled, in order to seal the inside of the pipe from the groundwater or earth pressure, the connecting portions between the divided pieces 3S constituting the impermeable wall 3 and the dredger pipes 2 and 2 are provided. Welding prevented the infiltration of groundwater, but these operations had a problem that the smaller the diameter of the pipe, the more difficult the operation.
[0008]
This invention solves the above-mentioned problem, and after preventing the water-impervious wall from protruding from the soot pipe and forming it into a bowl shape, it is an object to reliably prevent the occurrence of water spots and water leakage into the pipe without performing welding work. It was made as.
[0009]
[Means for Solving the Problems]
In the pipe for water-impervious wall mounting according to claim 1, the main body of the pipe constructed by the propulsion method is cut into two in the axial direction, and the outer diameter is the same as the pipe main body. The body is fixed in a watertight manner between the cut portions, and a liner formed by dividing the cylindrical body into a plurality of portions in the circumferential direction is installed between the cut portions so as to be axially propelled. After the lay pipe is laid by the propulsion method, the elastic cylinder is exposed on the inner surface of the pipe by detaching the liner, and the elastic cylinder is pierced from the inside to the pipe radial direction. It is characterized in that the water shielding wall can be constructed by directly projecting the partition piece for the water shielding wall toward the outside.
[0010]
That is, when the split piece constituting the impermeable wall is protruded from the inside of the pipe , the fracture surface of the elastic cylinder such as rubber is in a state where the surface of the split piece is in pressure contact, so that the watertightness in the pipe is increased by this portion. In addition, if the base of the partition wall for the impermeable wall is fixed between the cut parts by inserting a waterproof seal material or the like, the inside of the pipe can be sealed from the groundwater or the ground without welding. .
[0011]
The watertight wall mounting soot pipe of claim 2 is the watertight wall mounting soot pipe of claim 1, wherein the elastic cylinder has a three-layer structure of an outer layer, an intermediate layer, and an inner layer, It is cut at the axially intermediate portion .
[0012]
The water shield wall mounting pipe according to claim 3 is the water shield wall mounting steel pipe according to claim 1, wherein the elastic cylinder has a two-layer structure of an outer layer and an inner layer, and the inner layer is an intermediate portion in the axial direction. It has been cut with.
[0013]
In these cases, when the divided piece is protruded from the inside of the tub tube, it is easy to protrude because a part of the elastic cylinder is cut.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described.
FIG. 1 is a cross-sectional view of a main part of a water shield wall mounting pipe according to an embodiment of the present invention, and FIG. 2 is a main part enlarged view of FIG.
[0015]
In FIG. 1 and FIG. 2, the water shielding wall mounting soot pipe 10 is attached by welding to the ribs 2 b and 2 b welded to the intermediate part of the straight pipe part 11 of the soot pipe 2 laid by the propulsion method. . And the main body part of the dredging pipe 10 between the ribs 2b and 2b is cut in two axial directions, and the outermost periphery is the same outer diameter as the exterior concrete 2a of the dredging pipe 2 between the cutting pipes 12 and 12, and the inner surface An elastic cylinder 14 having an extending portion 13 extending along the inner surface of the rod tube 2 is stretched on the side, for example, a rubber cylinder, and both ends thereof are fixed to the inner surfaces of the respective cutting tubes 12 and 12. A liner 15 is formed between the cutting pipes 12 and 12 and is bolted to the inner side thereof by bolts 15a and 15a. It is configured so that it is fixed at 1 and becomes a single tube. In the figure, 2c is a receiving port of the tub tube 2 and 2d is an insertion port.
[0016]
When a strong propulsive force is applied, a reinforcing stay bar 17 is installed between the support fittings 28a, 28a attached using the injection hole 28 for grout injection provided on the outer periphery of the soot tube 2. May be.
[0017]
Next, the use state of this soot pipe for attaching a water shielding wall will be described.
First, the dredger pipe 2 in the state shown in FIGS. 1 and 2 is propelled and laid on a predetermined embankment, and the dredger pipe 10 is positioned at a position where a water shielding wall is provided as shown in FIG. At this time, the impermeable pipe 10 for attaching the impermeable wall is integrally joined to the eaves pipe 2 by ribs 2b and 2b, and the cutting pipes 12 and 12 constituting the eaves pipe 10 are integrated by a liner 16. The outer periphery is sealed in a watertight manner by a cylindrical body 14 having elasticity, and has the same outer diameter as that of the soot tube 2 , so that it is not damaged by friction with the external ground during propulsion.
[0018]
If the tube is then pushed into place and placed, the stay bar 17 is removed if attached and then the liner 16 is removed. Then, as shown in FIG. 3, the cylindrical body 14 having elasticity is exposed in the water shielding wall mounting tub 10.
[0019]
At this time, even if groundwater or the like is present on the outer periphery of the pipe, it is prevented from flowing into the pipe by the elastic cylinder 14.
Next, the tip of the divided piece 3 </ b> S for the impermeable wall 3 is made to face the cylindrical body 14. As shown in FIG. 4, the split piece 3S for the impermeable wall shown in this embodiment has a liner portion 18 that is laid between the cutting pipes 12 as shown in FIG. A water impervious wall wing 19 is erected along the circumferential end , and one end is a cylinder 20 and the other is a cylinder 21 that receives the cylinder 20, and the cylinder 20 is inserted into the cylinder 21 in the axial direction. Thus, the divided pieces 3S are connected to each other in the circumferential direction.
[0020]
Then, as shown in FIG. 5, the cylindrical body 14 having elasticity is pierced, and the divided pieces 3 </ b> S are sequentially protruded from the inside of the pipe toward the outside in the circumferential direction.
As shown in FIG. 5 to FIG. 7, a sealing elastic material 22 such as a sponge sheet is sandwiched between the liner portions 18 adjacent in the circumferential direction, and a pressing rubber plate 24 is applied with a sealing rubber sheet 24 interposed therebetween. The both ends are fastened with bolts 26, 26.
[0021]
At this time, the portion through which the split piece 3S penetrates in the elastic cylinder 14 is bent flexibly along the surface of the wing 19 as shown in FIG. 5, so that groundwater or the like flows into the pipe from the outside. In addition, even if it enters through a gap, it is completely sealed by the sealing elastic member 22, the water-stopping O-ring 23, the sealing rubber sheet 24, and the like.
[0022]
Therefore, the water channel along the culvert pipe is blocked at the portion where the blade 19 is protruded, water leakage is prevented, and work such as welding is not required at all, and a water shielding wall can be easily constructed. Finally, grout is injected from the injection hole toward the outer periphery of the soot tube to fill the gap with the ground.
[0023]
In the above embodiment, the elastic cylinder 14 has a three-layer structure of inner and outer layer portions 30, 31 and an intermediate layer 32 as shown in FIG. 8, and only the intermediate layer 32 is cut along the axial intermediate portion. If it is set as the structure cut | disconnected by 33, it will become easy to protrude the division | segmentation piece 3S. Moreover, the situation of the cutting line of the rubber layer when protruding can be made uniform.
[0024]
Incidentally, the laminated structure of the cylindrical body 14 having elasticity and a two-layer, as shown in FIG. 9, may have a structure in which a cut line 33 to the inner layer 31.
[0025]
【The invention's effect】
As described above, in the present invention, when a water shielding wall is attached after a dredger pipe is disposed on a dike, a partition piece for a water shielding wall is directly projected from the pipe without using a hardened chemical solution or the like as in the prior art. In addition, since watertightness can be achieved with a fastening member such as a bolt regardless of welding or the like, the pipe laying operation can be remarkably facilitated.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a main part of an embodiment.
FIG. 2 is an enlarged view of a main part of FIG.
FIG. 3 is an enlarged cross-sectional view showing a state where a liner is removed.
FIG. 4 is a perspective view of a split piece.
5 is a cross-sectional view showing a construction state, and shows a cross-sectional view taken along line BB of FIG.
FIG. 6 is a plan view showing a construction state.
7 is a cross-sectional view taken along line AA in FIG.
FIG. 8 is a cross-sectional view of another configuration example of an elastic cylinder.
FIG. 9 is a cross-sectional view of still another configuration example of a cylindrical body having elasticity.
FIG. 10 is an explanatory sectional view of a soot tube.
FIG. 11 is an enlarged view of a main part of a conventional soot tube.
FIG. 12 is a sectional view showing a construction state of a conventional impermeable wall.
FIG. 13 is a front view showing a construction state of a conventional impermeable wall.
[Explanation of symbols]
2 Steel pipe 10 Steel pipe for impermeable wall installation 11 Straight pipe part 12 Cutting part 13 Extension part 14 Cylindrical body 15 Fastening plate 16 Liner 17 Staber 18 Liner part

Claims (3)

The main body portion of the soot pipe laid by the propulsion method is cut in two axial directions, and an elastic cylinder having an outer diameter that is the same outer diameter as that of the soot pipe body is fixed in a watertight manner between the cut portions, A liner formed by dividing the cylindrical body into a plurality of parts in the circumferential direction inside the cylindrical body having elasticity is installed and fixed between the cutting portions so as to be able to withstand axial thrust, and the propellant pipe is constructed by a propulsion method. After laying down, the liner is removed to expose the elastic cylinder on the inner surface of the pipe, and the elastic cylinder is pierced from the inner side to directly protrude the water shielding wall dividing piece toward the outer side in the radial direction of the pipe. A water pipe for mounting a water shielding wall, characterized in that a water shielding wall can be constructed. 2. The water shielding wall mounting pipe according to claim 1, wherein the elastic cylinder has a three-layer structure of an outer layer, an intermediate layer, and an inner layer, and the intermediate layer is cut at an intermediate portion in the axial direction. . 2. A watertight wall mounting dredging pipe according to claim 1, wherein the elastic cylinder has a two-layer structure of an outer layer and an inner layer, and the inner layer is cut at an intermediate portion in the axial direction.

Images