JPH025202B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an underground continuous wall constructed around the outer periphery of an underground outer wall for use as earth retaining and water stopping purposes.

[Prior art]

The conventional underground external wall structure is as shown in Figure 6.
The underground outer wall 1 is constructed in close contact with the underground continuous wall 2, which is constructed by pouring concrete without voids, and the seepage water from each floor is drained from the lower floors and the basement side of the underground outer wall 1. A concrete block wall 10 is constructed to form a drainage channel 50 that guides the flow downward of the floor slab 7 located at the lowest level, and to close off the free fall space S of water between the upper and lower drainage channels 50, 50. .

[Problem that the invention seeks to solve]

In the case of such a conventional underground external wall structure, (a) the amount of concrete placed to construct the underground continuous wall 2 is large, and the construction period becomes longer due to the accompanying increase in concrete placing work time.

(b) Concrete block walls 10 are constructed on the basement side of each floor of the basement exterior wall 1, which not only reduces the effective area of the basement, but also tends to increase construction time and costs.

The first objective of the present invention is to shorten the construction period of an underground continuous wall by rationally modifying the underground continuous wall itself, and the second objective is to develop a structure for achieving the first objective. The aim is to improve the conventional problems associated with permeate water treatment by making effective use of simple modifications.

[Means for solving problems]

The characteristic structure of the underground continuous wall according to the present invention is that a hollow part for collecting seepage water is provided within the thickness of the continuous wall above the lower end of the underground outer wall or a place near it, and the hollow part is sandwiched between the walls. The wall portions on both sides in the thickness direction are continuously and rigidly connected in the longitudinal direction of the continuous wall body, and a drainage channel is provided from the hollow portion to the inside of the underground outer wall.

The effects of the above characteristic configuration are as follows.

[Effect]

In other words, by forming a hollow part within the thickness of the continuous wall, the amount of concrete poured to construct the continuous wall can be minimized, and furthermore, both walls in the thickness direction sandwiching the hollow part can be By connecting rigidly intermittently in the longitudinal direction of the continuous wall,
While it is possible to configure underground continuous walls with a structure strong enough to withstand various stresses such as earth pressure, it is possible to prevent water from penetrating into the continuous wall by forming it into a continuous wall for the purpose of shortening the construction period. Because the water can be discharged to the required location inside the underground outer wall through the hollow part and the drainage channel formed in communication with these, seepage water can be discharged to the basement side of the underground outer wall corresponding to the hollow part formation point as in the conventional method. This eliminates the need to construct special concrete block walls.

〔Effect of the invention〕

Therefore, in order to achieve the first objective, it is possible to secure sufficient mechanical strength required for an underground continuous wall, and to shorten the construction period by minimizing the time required for concrete pouring. By making effective use of the hollow part of the continuous wall that is formed, and by simply modifying the hollow part to form a drainage channel as described above, it is possible to shorten the construction period and reduce the cost of seepage water treatment work. In addition to being able to
The effective floor area of the basement has also been increased.

〔Example〕

As shown in Figure 1, the underground outer wall 1 of the underground structure
To configure the underground continuous wall 2 constructed around the outer periphery of
This is an example of a hollow part in the center of the thickness of the continuous wall.
A bottomed cylindrical hole 4 is provided as a hollow portion having a length extending from near the ground level GL to a position corresponding to the formation of the floor slab 3 on the second basement floor, and the bottomed cylindrical hole 4 is inserted in the thickness direction of the continuous wall body. Both side wall portions 2a sandwiched between
2a are integrally formed intermittently in the longitudinal direction of the continuous wall body, and furthermore, a drainage channel 6 is provided extending from the lower end of the bottomed cylindrical hole 4 to the inside of the underground outer wall 1.

In addition, the drainage channels 6 are provided in the wall portions 1a and 1b of the underground outer wall 2 located on both upper and lower sides of the third basement floor.
Drain channels 8 and 9 that drain and guide water from the lower floors and below the floor slab 7 on the third basement floor, which is also the lowest floor.
At the same time, a concrete block wall 10 is constructed to close off the free fall space S of water between these drainage channels 8 and 9.

In addition, numeral 11 in the figure is a weir formed on the floor slab 3 on the second basement floor.

Next, an example of a method of constructing the underground continuous wall 2 configured as described above will be explained.

(b) As shown in Figure 2, excavate the area where the continuous wall is planned to be constructed, and place steel pipes 1 for forming hollow parts in the reinforcing bar cage 12.
The arc-shaped guides 14, 14 for 3 are attached and built into the excavated hole a.

(b) After wrapping a synthetic resin foam sheet (trade name: Sekisui T-Foom, etc.) to make it easier to pull out the steel pipe 13, the tip of which has been sealed, the tube is inserted along the arcuate guides 14, 14. and pour concrete.

(c) After concrete is poured, the steel pipe 13 is pulled out through the chuck 15 and jack 16 which are clamped and fixed to the steel pipe 13, as shown in FIG. 3, and is used for other purposes.

In the above-described embodiment, the underground structure has three floors underground, but the number of floors can be freely changed depending on various conditions.

[Another example]

(a) As shown in FIG. 4, the bottomed cylindrical hole 4 of the underground continuous wall 2 is formed in a state displaced outward from the center position in the thickness direction of the continuous wall. In the case of this embodiment, since it is possible to actively induce cracks toward the bottomed cylindrical hole 4 for forming the seepage water discharge space, for example, the bottomed cylindrical hole 4 can be connected to a continuous wall. Compared to the case where the bottomed cylindrical hole 4 is displaced inward from the center position in the thickness direction
There is an advantage that water leakage caused by cracks occurring in other locations can be suppressed.

(b) As shown in Fig. 5, steel frames 17... were erected at a predetermined pitch in the excavated hole a, and urethane 18 for forming hollow portions was filled between these adjacent steel frames 17, 17... Afterwards, concrete will be poured.

After concrete is poured, urethane 18... is extracted. In other words, both wall portions 2a, 2a in the thickness direction sandwiching the hollow portion 4 of the continuous wall body are connected to the steel frame 17.
Rigidly connect at...

[Brief explanation of drawings]

Figures 1 to 3 show examples of underground continuous walls according to the present invention, with Figure 1 being a vertical front view, and Figures 2 and 3 being a plan view and a vertical front view showing an example of the construction method. be. 4 and 5 are cross-sectional plan views of main parts showing different embodiments, respectively, and FIG. 6 is a longitudinal cross-sectional front view showing a conventional underground continuous wall. DESCRIPTION OF SYMBOLS 1... Basement outer wall, 2a... Both side wall parts, 4... Hollow part, bottomed cylindrical hole, 6... Drainage channel.

Claims (1)

[Claims] 1 An underground continuous wall constructed around the outer periphery of the underground outer wall 1, which is provided with a hollow part 4 for collecting seepage water within the thickness of the continuous wall above the lower end of the underground outer wall 1 or a place near it. , both side wall portions 2a, 2a in the thickness direction sandwiching the hollow portion 4
are rigidly connected intermittently in the longitudinal direction of the continuous wall body, and a drainage channel 6 is provided extending from the hollow part 4 to the inside of the underground outer wall 1.