JP2676205B2 - Construction method of water collecting pipe on underground wall - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is designed to remove water that permeates inside a continuous underground wall,
The present invention relates to a method of constructing a water collecting pipe for guiding to a water collecting pit provided outside the underground wall. “Prior art” Underground structures such as underground tanks that use underground continuous walls (hereinafter simply referred to as continuous walls) will penetrate from the surrounding ground to the inside of the continuous walls depending on the structural type after completion. It is necessary to drain the water. Therefore, in the past, in general, the second
As shown in the figure, the water collecting pit 2 is provided outside the continuous wall 1, and the water collecting pipe 3 that connects the lower part of the water collecting pit 2 and the inside of the continuous wall 1 is provided through the continuous wall 1. The water that has permeated into the inside of the continuous wall 1 is guided to the water collecting pit 2 through the water collecting pipe 3, and is pumped up by the submersible pump 4 installed in the water collecting pit 2 to be drained. When constructing the water collecting pit 2 and the water collecting pipe 3, the method generally shown in FIG. 3 or 4 is conventionally used. In the method shown in FIG. 3, the water collecting pipe 3 is preliminarily connected to the lower part of the large-diameter and long vertical pipe 5 (generally a steel pipe is used) which constitutes the water collecting pit 2, and these are connected to (a). As shown in the figure, it is integrally incorporated into a reinforcing bar cage 6 which constitutes the continuous wall 1 and is built in a predetermined position together with the reinforcing bar cage 6. Then, after placing concrete around the reinforcing bar cage 6 and around the vertical pipe 5 and completing the construction of the continuous wall 1 and excavating the inside,
As shown in (b), the concrete on the surface of the continuous wall 1 is removed to expose the water collecting pipe 3. Further, in the method shown in FIG. 4, after the rebar cage 6 has been installed, only the vertical pipe 5 is installed at a predetermined position as shown in (a), the construction of the continuous wall 1 is completed, and the inside thereof is excavated. After that, as shown in (b), core boring is performed at a position where the water collecting pipe 3 should be attached, and a communication hole 7 having a diameter larger than that of the water collecting pipe 3 is formed.
Then, the water collecting pipe 3 is arranged in the communication hole 7 as shown in (c), and the gap between the communication hole 7 and the water collecting pipe 3 is filled with grout 8 such as mortar. Is. [Problems to be Solved by the Invention] However, in the method shown in FIG. 3, since the vertical pipe 5 and the water collecting pipe 3 are incorporated into the reinforcing bar basket 6, when the wall thickness of the continuous wall 1 is large or the reinforcing bar basket 6 is If it is long, the weight of the rebar cage 6 becomes too large, so that a super-large crane is required for the work to build the rebar cage 6, and it is impossible to hang it with the existing crane. there were. Moreover, in the method shown in FIG. 4, especially when the wall thickness of the continuous wall 1 is large, the bar arrangement is complicated, or the diameter of the water collection pipe 3 is large, it takes a long time to perform core boring. Not only was the property poor, but there were also problems such as cutting the reinforcing bars of the continuous wall, and the core boring position was misaligned, making it difficult to join the vertical pipe. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method of constructing a water collecting pipe having excellent workability. "Means for Solving the Problems" The present invention is installed by penetrating an underground continuous wall,
In a method of constructing a water collecting pipe that connects a water collecting pit provided integrally with the underground continuous wall by being placed around the vertical pipe to the inside of the underground continuous wall and the inside of the underground continuous wall In addition, a sleeve having a thickness equal to or slightly shorter than the thickness of the underground continuous wall at a predetermined position of the reinforcing bar cage of the underground continuous wall is arranged at a position facing the lower part of the vertical pipe forming the water collecting pit, Both ends of the sleeve are closed, the reinforced cage is built and concrete is placed, and when the concrete hardens and the construction of the underground continuous wall is completed, the inside of the underground continuous wall is excavated, and thereafter, A through hole is formed by core boring through the sleeve from the inside of the underground wall to the concrete between the sleeve and the vertical pipe, and the water collecting pipe is formed in the sleeve and the through hole. It is characterized by disposing. "Embodiment" An embodiment of the construction method of the present invention will be described below with reference to FIG. 1 (a) to 1 (c) show the construction method of this embodiment in the order of steps, the same parts as in the case of the conventional method described above are designated by the same reference numerals and the description thereof will be omitted. . In the construction method of this embodiment, first, as in the case of the conventional construction method shown in FIG. 4, a reinforcing bar cage 6 to be buried in the continuous wall 1 is built, and then a water collecting pit is provided outside thereof. The vertical pipe 5 which constitutes 2 is built up, but the sleeve (sheath pipe) 10 is attached to the rebar cage 6 in advance. The sleeve 10 is made of, for example, a steel pipe, its diameter is made slightly larger than that of the water collecting pipe 3, and its length is made slightly shorter than the wall thickness of the continuous wall 1, so that concrete does not flow into the inside of the sleeve 10. Block it. Then, as shown in (a), the sleeve 10 is provided with a rebar cage 6 and a vertical pipe 5.
Are installed at positions facing the lower end of the vertical pipe 5 when they are respectively installed. After the rebar cage 6 with the sleeve 10 attached and the vertical pipe 5 are built as shown in (a), concrete is poured to embed the reinforcing bar cage 6 and the vertical pipe 5 in the concrete. After hardening and construction of the continuous wall 1 and the water collecting pit 2 is completed, the ground inside the continuous wall 1 is excavated.
Then, the surface layer of the concrete is scraped off to expose the tip of the sleeve 10, and the tip of the core boring machine is inserted into the sleeve 10, and with respect to the concrete between the rear end of the sleeve 10 and the vertical pipe 5. Core boring is performed to form a communication hole 11 having a diameter slightly smaller than that of the sleeve 10 and slightly larger than that of the water collection pipe 3 as shown in (b). Subsequently, as shown in (c), the water collecting pipe 3 is arranged in the sleeve 10 and the communication hole 11, and the grout is provided in the gap between the outer surface of the water collecting pipe 3 and the inner surface of the sleeve 10 and the communication hole 11. The construction is completed when 12 is filled and the grout 12 is hardened. According to the above method, only the sleeve 10 is attached to the rebar cage 6, and the vertical pipe 5 and the rebar cage 6 are separately built. Therefore, the vertical pipe 5 shown in FIG. Basket 6
Unlike the conventional method of incorporating and building in, the reinforcing bar cage 6 does not become too heavy and difficult to build. Further, since core boring is performed only for a short distance between the sleeve 10 and the vertical pipe 5, the conventional method of performing core boring on the entire wall thickness of the continuous wall 1 shown in FIG. As described above, the accurate communication hole 11 can be easily formed without requiring a long time for core boring. The length of the sleeve 10 may be equal to the wall thickness of the continuous wall 1. Further, if the tip of the sleeve 10 is exposed on the concrete surface, the position of the sleeve 10 becomes clear when the sleeve 10 is squeezed out, and the squeezing out is also easy. [Effect of the Invention] As described in detail above, according to the construction method of the present invention, the sleeve with both ends closed is attached to the rebar cage in advance, and the concrete between the sleeve and the vertical pipe is Since core boring is performed, the rebar cage will not become too heavy and difficult to assemble, and core drilling will not take a long time, and accurate communication will be easy. The hole can be formed, and therefore the workability is extremely good.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 (a) to 1 (c) are vertical sectional views showing an embodiment of a construction method of the present invention in the order of steps. FIG. 2 shows a schematic structure of a water collecting pit and a water collecting pipe provided on the outer side of the underground wall, of which (a) is a vertical sectional view and (b) is a plan view. 3 (a), (b), and FIGS. 4 (a)-(c).
[Fig. 3] is an elevation sectional view showing a conventional construction method in the order of steps. 1 ... Underground wall, 2 ... collection pit, 3 ... collection pipe,
5 ... Vertical pipe, 6 ... Rebar cage, 10 ... Sleeve, 11 ... Communication hole.

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Shigemi Wakayama               Shimizu, 2-6-1 Kyobashi, Chuo-ku, Tokyo               Construction Co., Ltd. (72) Inventor Kojima Unification               Shimizu, 2-6-1 Kyobashi, Chuo-ku, Tokyo               Construction Co., Ltd. (72) Inventor Yasuhide Kuwahara               Shimizu, 2-6-1 Kyobashi, Chuo-ku, Tokyo               Construction Co., Ltd.

Claims (1)

(57) [Claims] The water collecting pit and the underground continuous wall, which are integrally attached to the underground continuous wall by being installed by penetrating the underground continuous wall and placing concrete around the vertical pipe, and the outside of which are provided. In the method of constructing the water collecting pipe communicating with the inside of the bottom of the vertical pipe constituting the water collecting pit, a sleeve having a thickness equal to or slightly shorter than the thickness of the underground continuous wall is provided at a predetermined position of the rebar cage of the underground continuous wall. It is placed at a position opposite to, and both ends of the sleeve are closed, the reinforced basket is installed and concrete is poured, and when the concrete is hardened and construction of the underground wall is completed, The inside of the underground continuous wall is excavated, and thereafter, the communication hole is formed by core boring through the sleeve from the inside of the underground continuous wall to the concrete between the sleeve and the vertical pipe. Construction method of water collecting pipes in underground continuous wall, characterized by disposing the water collecting pipe to the sleeve and communicating hole.