JP2000064260A - Cut-off wall structure of sluice pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form cut-off bulkheads in a wide range and to prevent a water channel from being generated by extending a cut-off wall from a special sluice pipe provided on a sluice pipe passing through a bank and propelling and integrating the cut-off wall into ground improving parts for cut-off formed on upstream and downstream sides of the sluice pipe. SOLUTION: A starting pit and an attaining pit are punched at the outside of a bank 1 and at the inside of the bank 1, the pits are orthogonally crossed with a through expected route of a sluice pipe 2, steel sheet piles are driven deeper than the sluice way 2 on upstream and downstream sides and a ground improving part for cut-off 3 is formed. The sluice pipe 2 in which a special sluice way incorporating a cut-off wall 4 having a radius to attain the ground improving part 3 for cut-off is interposed is propelled in a part corresponding to the ground improving part 3 for cut-off within the bank 1 by a propelling method of construction from the staring pit. After the special sluice pipe is passed through the bank 1, the special sluice pipe is slid and moved, the cut-off wall 4 is extended in a radial direction from a gap, the cut-off wall 4 is connected integrally with the ground improving part 3 for cut-off via injected grout and a cut-off bulkhead in which a water channel is not generated in a remarkably wide range is formed. Because a large-scaled cut and cover construction is not performed, a traffic obstacle on a road on an upper surface 1b of the bank 1 hardly occurs.

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to an improvement in the structure of a water impermeable wall provided around a gutter pipe buried in a dike or the like. 2. Description of the Related Art In order to prevent flooding and rupture of a levee at the time of rising water, a gutter pipe provided with an open / close valve is provided at a base portion of the levee. Wastewater may be discharged to treatment facilities. Incidentally, in order to prevent the formation of water around the gutter pipe, a water-blocking wall is generally provided substantially at the center of the pipe. Conventionally, the impervious wall is constructed by excavating around the gutter pipe and burying it after constructing the impervious wall. After excavating the space for the impermeable wall from this gap, the fan-shaped connecting piece is extended while connecting in the radial direction and the circumferential direction, and is extended. There is a known construction method. [0004] However, the former excavation method among the above-mentioned methods has a problem that it is not preferable for disaster prevention because the embankment is cut even though it is temporary. [0005] In addition, when the upper surface of the embankment is a road, traffic is completely cut off from the start to the end of the construction, so that there is a complication that a detour must be provided. Furthermore, there was a problem that enormous construction costs were required and economic efficiency was poor. In the latter method of connecting and extending the fan-shaped pieces, although there is no disadvantage as in the former method, the connecting pieces are extended from a narrow gutter pipe while being added, so that the extending radius is long. There is also a limit, and there is a concern that a water impermeable wall having a sufficient outer diameter cannot be formed. SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a drainage wall of a gutter pipe provided on a dike with a sufficient area to surely prevent the occurrence of water channels. This was done as an issue. According to the present invention, there is provided a watertight wall structure for a gutter pipe, which is provided on the upstream side and the downstream side of a gutter pipe penetrating portion from a top surface of the embankment in a direction perpendicular to the gutter pipe. A water-impermeable ground improvement section is provided deeper than the gutter pipe, and a water-impervious wall having a radius reaching the water-impermeable ground improvement section extends in the radial direction in the gutter pipe, and The ground improvement part for water is integrally connected. According to the above invention, the impermeable wall is formed by extending from the gutter pipe, so that traffic on the embankment is not interrupted for a long time, and even if the extending radius of the impermeable wall is short. , Since its end is connected integrally with the surrounding ground improvement part,
It can be a sufficiently impermeable wall. An embodiment of the present invention will be described below. FIG. 1 is a plan view of an embodiment of a gutter pipe impermeable wall structure of the present invention, FIG. 2 is a sectional view taken along line XX of FIG. 1, and FIG. 3 is a sectional view taken along line YY of FIG. It is. In FIG. 1, reference numeral 1 denotes an embankment, 2 denotes a gutter pipe, and a gutter pipe 2 is disposed at a base 1a of the embankment 1 from the outside of the embankment to the inside of the embankment. In the figure, reference numeral 2a denotes a valve provided on the outer side of the bank of the gutter tube 2, and 2b in FIG. In FIG. 1, reference numeral 3 denotes a water-improved ground improvement part, which is shown in FIG. 3 in a direction perpendicular to the gutter pipe 2 from the top surface 1b of the embankment 1 upstream and downstream of the gutter pipe 2 penetrating portion. As shown, it is provided deeper than the gutter tube 2. The water-impermeable ground improvement section 3 is one which has been subjected to a treatment for preventing the infiltration of river water. Excavating a trench-like groove, placing rebar inside and casting concrete, and also drilling a number of drill holes at the corresponding positions of the embankment 1, and using a water glass-based soil conditioner here It refers to pouring and hardening the ground to block water. As shown in FIG. 2, a water impervious wall 4 is formed on the gutter pipe 2 so as to extend from the inside of the gutter pipe 2, and the end thereof is integrally connected to the water impervious ground improvement part 3. . In this integrated connection, grout 4a injected when forming the impermeable wall 4 is injected to the impermeable ground improvement part 3, and is integrally connected via the grout 4a. Accordingly, the periphery of the gutter tube 2 is formed by a water-impervious wall 4 extending radially from the gutter tube 2, and a water-impermeable ground improvement part 3 formed on the upstream and downstream sides of the gutter tube 2. As a result, a water-shielding partition wall is formed to cover a considerably large area. Next, the construction method of the above embodiment will be described. FIG. 4 is a plan view showing an initial construction state, FIG. 5 is a plan view showing a state in which a gutter pipe is penetrated by a propulsion method, and FIG. 6 connects a water impermeable wall and a water impermeable ground improvement part. It is a top view showing a situation. First, as shown in FIG. 4, a starting shaft 5 and a reaching shaft 6 are bored outside and inside the embankment 1, and at the same time, for example, a sheet pile (shown in FIG. To form the impermeable ground improvement part 3. Next, as shown in FIG. 5, the gutter pipe 2 is penetrated into the embankment 1 by the jack 5a from the starting shaft 5 formed outside the embankment by the propulsion method. At this time, a propulsion is made by inserting a special gutter pipe as shown in FIG. When the gutter tube 2 reaches the reaching shaft 6, a water impervious wall 4 is formed on the gutter tube 2 as shown in FIG. The formation of the impermeable wall 4 is performed by opening the special-purpose gutter pipe 2A shown in FIG. That is, the special gutter pipe 2A has a front pipe 2B and a rear pipe 2C divided in the pipe axis direction, and a clearance s between the front and rear pipes 2B and 2C by an inner diameter connecting pipe 2D which engages with these inside pipes. The front and rear pipes 2 are supported in the axial direction so that
B, 2C and the inner diameter connection pipe 2D are locked by a lock ring 2E, and are sealed watertight by a sealing rubber 2G compressed by a bolt 2H and a pressing ring 2F. After penetrating the gutter tube 2 by the propulsion method, the lock ring 2E, the bolt 2H, the press ring 2F, and the seal rubber 2G are removed, and the inner diameter connection pipe 2D is slid and moved as shown in FIG. The s portion of the soil 1c is exposed to the inner surface of the gutter tube 2, and the soil 1c is excavated to form a space in which the impermeable wall 4 can be developed. Next, a fan-shaped connecting piece (not shown) is extended from the gap s while being connected in the radial and circumferential directions, and FIG.
Is formed as shown in FIG. After the formation of the impermeable wall 4, the inner diameter connecting pipe 2D is returned to the original position,
The lock ring 2E, the bolt 2H, the press ring 2F, and the seal rubber 2G are attached as before, and then the grout 4a is filled into the excavated soil space on the outer surface of the gutter pipe 2 from the injection port 2P formed in advance in the inner diameter connection pipe 2D, and the water is impervious. The wall 4 and the soil improvement part 3 for water shielding are integrated as shown in FIG. Thus, the gutter pipe impermeable wall structure of the present invention is completed. As described above, according to the present invention, when a gutter pipe is buried and installed on a dike, it is only necessary to perform a construction for improving the ground for water impervious from the upper surface of the dike in a direction along the dike. Since no serious excavation work is performed, traffic obstruction is unlikely even when the upper surface of the embankment is a road. Further, since the water impervious wall for preventing water passage along the gutter pipe is formed by the joint of the water impervious ground improvement part and the water impervious wall formed on the outer periphery of the gutter pipe, the water impervious wall is formed by extending from the gutter pipe. Even if the radius of the impermeable wall is small, the impermeable area is very large, so that there is an effect that reliable impermeable can be achieved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of a gutter pipe impermeable wall structure according to an embodiment of the present invention. FIG. 2 is a sectional view taken along line XX of FIG. FIG. 3 is a sectional view taken along line YY of FIG. 1; FIG. 4 is a plan view showing a construction method of a gutter pipe impermeable wall structure according to the embodiment of the present invention. FIG. 5 is a plan view showing a state of propulsion of the gutter tube according to the embodiment of the present invention. FIG. 6 is a plan view showing an assembled state of the impermeable wall according to the embodiment of the present invention. FIG. 7 is an explanatory sectional view of a special type gutter. FIG. 8 is an explanatory view of a construction method in a special type gutter tube. [Description of Signs] 1 Embankment 1a Embankment base 1b Embankment top surface 2 Gutter pipe 2A Special gutter pipe 3 Impermeable ground improvement section 4 Impermeable wall 4a Grout

Claims (1)

Claims: 1. A ground improvement section for impermeable water is provided on the upstream side and the downstream side of a gutter pipe penetrating portion from the top surface of a dike and deeper than the gutter pipe in a direction perpendicular to the gutter pipe. In the gutter pipe, a water impermeable wall having a radius reaching the water impermeable ground improvement portion is extended in a radial direction, and the water impermeable wall and the water impermeable ground improvement portion are integrally connected. Gutter pipe impervious wall structure.