JPH0649839A - Water passing method in continuous underground wall - Google Patents

Abstract

PURPOSE:To secure the water cut-off property at the time of construction of an underground building and the water passing property at the time of completion thereof easily. CONSTITUTION:Porous pipes 6 respectively having water passing holes 4 are arranged in the continuous underground wall 2 in the vertical direction, and the impermeable expansion material 8 is inserted into the porous pipe 6 to form the double-pipe structure. At the time of execution of an underground building, the water cutoff property is thereby secured, and at the time of completion, the impermeable expansion material 8 is eliminated and the rough grain material (crushed stone 36 or the like), is thrown into the porous pipe 6 to secure the water passing property. In place of the porous pipe 6, a square-shape water passing frame, to which a steel mesh is fitted at the ground side opening, is arranged in the vertical direction, or separate water passing parts can be distributed for arrangement in the wall thickness direction. Consequently, the water cut-off property at the time of construction and the water passing property at the time of completion can be secured by the simple work with the simple material to obtain the land slide protecting method, which prevent a change of ground water system for a long term.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-flowing method for a continuous underground wall, and in particular, to prevent water leakage when constructing an underground structure,
Further, the present invention relates to a water passage method for a continuous underground wall suitable for a mountain retaining method that ensures water passage at the time of completion.

[0002]

2. Description of the Related Art Conventional construction methods of this kind, namely, continuous earth wall construction method and soil cement column wall construction method, among the earth retaining construction methods, are used for retaining ground retaining materials. Was shut off and its water-stopping property was secured.
In addition, even after the completion of construction, it was customary for the water retaining to remain blocked by the mountain retaining material left underground.

[0003]

The above-mentioned prior art has a problem that it is difficult to secure the water permeability of groundwater after the completion of the underground structure, and the groundwater system changes, which causes a serious problem in the regional underground environment. Was becoming.

The object of the present invention is to solve the above-mentioned problems, and it is a continuous land which can easily secure the water stoppage at the time of construction of an underground structure and the like and the water permeability at the time of completion. The purpose is to provide a water flow method for the inner wall.

[0005]

[Means for Solving the Problems] The above-mentioned object is to prevent water when excavating in a continuous underground wall made of reinforced concrete for the purpose of intercepting groundwater and the like when constructing an underground structure. It is a construction method that allows water to pass through after the completion of the construction.It is achieved by arranging a special water-flowing frame in the vertical direction in the continuous underground wall to have both the function of blocking water and passing water. It In addition, a water passage portion that is formed by a water passage pipe that penetrates in the wall thickness direction of the continuous underground wall and a water collection box that is connected to this water pipe and that has an opening on the natural ground side is dispersedly arranged on the continuous underground wall. However, it can also be achieved by closing the water passage pipe at the time of water shielding and opening it at the time of water passage.

[0006]

According to the above construction, by using a perforated pipe, a non-perforated pipe, a rectangular or groove-shaped water passage as the special water passage, groundwater is cut off by the continuous underground wall, and construction such as excavation is performed. After completion of construction, groundwater can be passed. Therefore, the groundwater system does not change before and after the construction. Further, the water can be blocked and passed by opening and closing the dispersed water passages.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIGS. 1 and 2 show a continuous underground wall 2 in which a perforated pipe 6 having water passage holes 4 is arranged. As shown in FIG. A rubber sleeve 8 which is a water impermeable stretchable material is inserted inside to form a double tube structure. Then, at the time of construction of the underground structure, the rubber sleeve 8 is brought into close contact with the perforated pipe 6 by applying a water pressure (head 12) higher than the surrounding groundwater level 10 in the rubber sleeve 8 to secure the waterproofness. Further, at the time of completion, the rubber sleeve 8 is removed, and a coarse-grained material (crushed stone, etc.) is put into the perforated pipe 6 to prevent the inflow of the surrounding natural earth and sand into the pipe and ensure water permeability. . Further, in the present embodiment, as shown in the drawing, a projection member 11 is provided on the outer wall of the perforated pipe 6 so that the cast concrete does not flow out.

The rubber sleeve 8 of this embodiment is of a tip closed type, and when inserted, it is attached to the tip as shown in FIG.
Attach. The construction procedure of this embodiment is as follows. (a) After the continuous underground wall is excavated, a perforated pipe integrated with the rebar cage is built (b) A concrete is placed on the part other than the perforated pipe to build a continuous underground wall (c) Insert a rubber sleeve with a closed tip into the inside of the perforated pipe. (D) Pour mud into the rubber sleeve to pressurize it and stick it to the perforated pipe. (E) Build a structure inside the retaining pipe ( Excavation in the yard,
(Construction and backfilling with crushed stone) (f) Cutting of rubber sleeve tip (g) While putting crushed stone, pull up rubber sleeve (h) Finish construction and pass water.

(Second Embodiment) FIGS. 4 and 5 show a second embodiment. In this embodiment, the rubber sleeve 8 in the first embodiment is replaced with a rubber sleeve 16 having an open tip. Therefore, as shown in FIG. 4, it is easy to previously set the rubber sleeve 16 in the perforated pipe 6. In the case of this example, as shown in FIG. 5, after the perforated pipe 6 has been built in, the rooting concrete 18 is placed.

The construction procedure of this embodiment is as follows. (a) After the continuous underground wall has been excavated, a perforated pipe with an open end type rubber sleeve is installed. (b) A rooting concrete inside the open end type rubber sleeve
(C) Muddy water is added to the rubber sleeve to pressurize it, and it adheres to the perforated pipe (d) Concrete is placed on the part other than the perforated pipe to build a continuous underground wall (e) Build a structure inside the pier (excavation in the yard,
(Construction, backfilling with crushed stone) (f) Cutting off the rubber sleeve tip (g) Pulling up the rubber sleeve while introducing crushed stone (h) Completion of construction and passing water.

(Third Embodiment) This embodiment is a construction method in which the perforated pipe 6 and the intermediate partition plate 20 are used to secure the water stopping property at the time of construction of the mountain retaining work and the water permeability at the time of completion. . As shown in FIGS. 6 and 7, the intermediate partition plate 20 is provided in the perforated pipe 6.
To form a two-chamber structure. During construction of the underground structure, the groundwater level of the structure side chamber 21 decreases due to the excavation, so that the water pressure (head) due to the surrounding groundwater level acts on the surrounding ground side chamber 22 and the perforated pipe 6 The intermediate partition plate 20 and the partition plate 20 are in close contact with each other, and the waterproofness is secured. Further, at the time of completion, by removing the intermediate partition plate 20 and introducing a coarse-grained material (crushed stone, etc.) into the perforated pipe 6, it is possible to prevent the inflow of the surrounding natural earth and sand into the pipe and to ensure water permeability. It In the case of the present embodiment, a flange 24 is provided inside the perforated pipe 6, and the intermediate partition plate 20 is brought into close contact with the rubber packing 26. Bentonite mortar 28 is placed on the bottom of the perforated pipe 6. Further, during construction of an underground structure, the structure side chamber 21 can be used as a pumping pipe for a deep well or the like.

The construction procedure of this embodiment will be described below. (a) After the continuous underground wall is excavated, a perforated pipe with a flange inside is installed (b) Concrete is placed in the part other than the perforated pipe to construct a continuous underground wall (c) Insert a partition plate with packing inside the perforated pipe (d) Insert low strength impermeable material such as bentonite mortar with a thickness of about 1.0 m into the perforated pipe (e) Deep well in the structure side chamber of the partition plate (F) Excavation in the yard using the deep well (pumping with the deep well, or
(There is a water head difference on the outside and the inner partition plate and the inner flange of the perforated pipe are in close contact.) (G) Construction of the structure inside (mounting and backfilling with crushed stones) (h) Structure of the inner partition plate after removal of the deep well Inject crushed stones into the material side chamber and separate the intermediate partition plate and the inner flange of the perforated pipe. (I) While pulling out the intermediate partition plate, inject crushed stones into the surrounding natural ground side chamber. (J) Finish construction and pass water.

(Fourth Embodiment) FIG. 8 shows an example of the fourth embodiment. Instead of the flange 24 of the third embodiment, an I-shaped partition plate 30 and a rubber packing 32 are used to form two chambers. It is designed to form a structure. FIGS. 9, 10, and 11 show another example of this embodiment, in which a hard partition rubber 34 is used instead of the rubber packing.

(Fifth Embodiment) In this embodiment, the perforated pipe 6 described above is used.
Instead of this, a non-perforated pipe having no water passage is arranged to construct a continuous underground wall. Since it is a non-perforated pipe, the passage of ground water is blocked, and after the construction of the underground structure is completed, water permeation is secured by forming a water passage hole in this non-perforated pipe. The shape of the water passage hole is not limited to a circular hole, but if the water passage hole is a long hole, a slit, or the like, the water passage performance is improved, and workability is efficient.

(Sixth Embodiment) This embodiment is a fifth embodiment using a non-perforated pipe, and in particular, a water passage is formed first in the pipe wall on the excavation side to be used as a pumping pipe, and after completion of construction. This is an embodiment in which a water passage hole is formed in the ground-side pipe wall to restore water passage.

Another embodiment of the present invention will be described below. (Seventh Embodiment) FIGS. 12 and 13 show a seventh embodiment of the present invention. FIG. 12 is a perspective view and FIG. 13 is a transverse sectional view. As shown in these figures, in the vertical direction of the continuous underground wall 2, as a special water transmission frame, rectangular water transmission frames 50 having two facing surfaces are opened at appropriate intervals, and the continuous underground wall 2 is provided. When constructing the underground structure 52 with the sand bar interposed, the mountain retaining pipe and the groundwater are cut off, and after the construction, the groundwater can freely flow. A steel mesh 54 for preventing the inflow of earth and sand is attached to the two openings of the rectangular water flow frame 50 in the water flow direction. The rectangular water-passing frame 50 has the same thickness as the continuous underground wall 2, and the steel mesh 54 is substantially flush with the wall surface of the continuous underground wall 2.

A partition plate 56 which can be removed in the vertical direction is provided in the rectangular water-passing frame 50, and the partition plate 56 blocks ground water when necessary, such as during excavation on the structure 52 side. A rubber packing 58 is used at the contact portion between the partition plate 56 and the rectangular water passage frame 50 to enhance water impermeability, if necessary. When you want to keep water flowing after the construction is completed, etc., the partition plate 5
By pulling out 6 it becomes water-permeable. In this case, FIG.
Then, although the crushed stone 36 is filled in the rectangular water passage frame 50,
It may not be filled.

FIG. 14 is a perspective view showing a state after completion after the continuous underground wall 2 is constructed and the structure 52 is constructed by using this embodiment. A rectangular water passage frame 50 is appropriately provided on the built continuous underground wall 2, a steel mesh 54 is attached to the opening of the rectangular water passage frame 50, and crushed stones 36 are filled inside. A groundwater flow 60 indicated by an arrow in the figure exudes through the rectangular water frame 50, flows through the backfill soil 62 or the water board 64, and flows from the higher groundwater level 10 to the lower groundwater level depending on the construction. Water withdrawal is prevented. The rectangular water-passing frame 50 has a steel mesh 54 extending vertically.
Since the groundwater flow 60 is provided, the groundwater flow 60 is passed under the impermeable layer 66 in the same manner as above.

(Eighth Embodiment) FIG. 15 is a transverse sectional view showing an eighth embodiment of the present invention. As shown in the figure, in this embodiment, as a special water-passing frame, for example, a U-shaped grooved water-passing frame 70 thinner than the wall thickness of the continuous underground wall 2 is provided in the vertical direction with the opening surface facing the natural ground side. Steel mesh 72 on the opening surface.
However, the structure is attached to the steel mesh mounting member 74 of the channel-shaped water-passing frame 70, and has a structure in which groundwater on the ground side can enter. A water passage sleeve 76 penetrating the underground wall is arranged on the rear surface of the U-shape at various places in the vertical direction. According to this embodiment, the water passage sleeve 76 can be easily blocked or passed. For example, a stretchable material is used for the attachment portion of the grooved water-passing frame 70 and the water-passing sleeve 76, and the sleeve mouth is covered with a film-like one to keep the water-impervious state. By removing the film, it is possible to make water pass. Moreover, the groundwater can be widely collected during water passage without impairing the strength of the continuous underground wall.

(Ninth Embodiment) FIGS. 16 and 17 are vertical sectional views for explaining a ninth embodiment of the present invention.
In this embodiment, as shown in FIG. 16, an expandable bag-like object (packer 78) is attached to the attachment position of the water passage sleeve 76, and gas or liquid is filled in the packer 78 at a high pressure to shield the object. It plays the role of a water valve. At the time of excavation, the packer 78 is inflated to block water, and after the construction is completed, the inside of the packer 78 is decompressed as shown in FIG.
Water removal can be obtained by removing.

In the embodiment using these water passage sleeves, it is possible to easily carry out the interception and the water passage of the ground water by the water passage sleeve, so that the coarse grained material or the like is put in the groove-shaped water passage frame. By filling the inside, it is possible to prevent the soil from collapsing in the ground without using a steel mesh and to ensure the water flow function. Of course, the steel mesh and the coarse-grained material may be used together.

In some of the embodiments described above, the special water-passing frame is provided in the vertical direction of the continuous underground wall, but the water blocking and water-passing means are partially provided in the continuous underground wall. You can also (Tenth Embodiment) FIGS. 18 and 19 show a tenth embodiment of the present invention.
FIG. 18 is a perspective view and FIG. 19 is a transverse sectional view. As shown in these drawings, the present embodiment is a method of appropriately arranging the water passage portion 80 on the continuous underground wall 2.
The water passage portion 80 is configured by connecting a water collection box 82 and a water passage pipe 84, and the water collection box 82 is for improving water collection efficiency, and is installed on the ground side surface portion in the continuous underground wall 2. The water passage pipe 84 on the back side of the pipe penetrates the continuous underground wall 2. Further, the water collecting box 82 has a structure in which the ground side is opened, and a steel mesh 86 is attached to the opening to prevent the inflow of the earth and sand. On the other hand, a check valve 88 is previously provided inside the water passage pipe 84, and a check valve action for opening the closed check valve 88 on the continuous underground wall on the excavation side where the water passage pipe 84 is open. A hardware 90 is provided.

20 and 21 are views for explaining the opening / closing operation of the check valve at the time of water blocking and water passing, respectively.
0 indicates a water impervious state, and FIG. 21 indicates a water passing state.
As shown in FIG. 20, at the time of excavation, water is blocked by the check valve 88 locked to the stopper 92. Further, as shown in FIG. 21, when water is required to be passed through, the check valve working metal 9
By moving the rod 90a of No. 0 toward the excavation side (left direction in the figure) in the water pipe 84, the check valve 88 is opened and the water flow state is set. Therefore, the check valve working metal 90 is mounted before backfilling on the excavation side, and when backfilling the earth and sand after the structure is completed, earth pressure due to backfilling acts to push open the check valve 88. Can be in water. The water passages can be installed in a distributed manner according to the state of groundwater on the ground side, and the groundwater on the ground side can be efficiently passed.

[0024]

As described above, according to the present invention, the earth retaining method using a continuous underground wall, which is necessary when constructing a deep underground structure, can be used as a waterproof material at the time of construction by using simple materials and simple work. It is possible to secure the water permeability at the time of completion and make a retaining method that does not change the groundwater system in the long term.

[Brief description of drawings]

FIG. 1 is an elevational view showing an outline of the present invention.

FIG. 2 is an explanatory cross-sectional view showing the outline of the present invention.

FIG. 3 is a perspective view of a perforated pipe according to the first embodiment of the present invention.

FIG. 4 is a perspective view of a perforated pipe according to a second embodiment of the present invention.

FIG. 5 is a perspective view of a perforated pipe according to a second embodiment.

FIG. 6 is a perspective view of a perforated pipe according to a third embodiment of the present invention.

FIG. 7 is a sectional view of a perspective view of a perforated pipe according to a third embodiment.

FIG. 8 is a sectional view of a perforated pipe showing an example of a fourth embodiment of the present invention.

FIG. 9 is a perspective view of a perforated pipe showing another example of the fourth embodiment.

FIG. 10 is a cross-sectional view of a perspective view of a perforated pipe showing another example of the fourth embodiment.

11 is a detailed view of a portion A in FIG.

FIG. 12 is a perspective view showing a seventh embodiment of the present invention.

FIG. 13 is a sectional view of a seventh embodiment.

FIG. 14 is a perspective view for explaining a function and effect of the seventh embodiment.

FIG. 15 is a sectional view showing an eighth embodiment of the present invention.

FIG. 16 is a cross-sectional view showing the ninth embodiment of the present invention when water is blocked.

FIG. 17 is a cross-sectional view showing when water is flowing in the ninth embodiment.

FIG. 18 is a perspective view showing a tenth embodiment of the present invention.

FIG. 19 is a sectional view of a tenth embodiment.

FIG. 20 is a cross-sectional view illustrating a water blocking state of the tenth embodiment.

FIG. 21 is a cross-sectional view illustrating a water flow state of the tenth embodiment.

[Explanation of symbols]

 2 Continuous underground wall 4 Water holes 6 Perforated pipe 8 Rubber sleeve (tip closed type) 10 Groundwater level 12 Water level in pipe 16 Rubber sleeve (open tip type) 20 Partition plate 21 Structure side chamber 22 Groundside chamber 24 Flange 26 Packing 28 Bentonite mortar 30 I-type partition plate 32 Rubber packing 34 Partition rubber 36 Crushed stone 50 Rectangular water frame 52 Structure 54 Steel mesh 56 Partition plate 58 Rubber packing 60 Groundwater flow 62 Backfill soil 64 Water plate 66 Impermeable layer 70 Channel-shaped water frame 72 Steel mesh 74 Steel mesh mounting member 76 Water passage sleeve 78 Packer 80 Water passage portion 82 Water collection box 84 Water passage pipe 86 Steel mesh 88 Check valve 90 Check valve action hardware 90a Rod 92 Stopper

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobuo Komatsu 2-25-8 Higashibuchi Nobe, Sagamihara City, Kanagawa Prefecture (72) Inventor Mitsunobu Ogihara 1-6-15-406 (72) Invention Shibakubocho, Tanashi City, Tokyo Person Yoshinori Matsuda 5-11-39-104 Shakujidai, Nerima-ku, Tokyo (72) Inventor Keiichi Sakamoto 1-6-8 Saint-Kigaoka, Tama-shi, Tokyo (72) Inventor Tadashi Takatsu 3-Nakamachi, Koganei-shi, Tokyo 22-14-105 (72) Inventor Kaneyuki Yoshida 768-14 Nase-cho, Totsuka-ku, Yokohama, Kanagawa Prefecture (72) Inventor Takeji Ishii 8-12-1-906 Takashimadaira, Itabashi-ku, Tokyo

Claims (8)

[Claims] 1. A continuous underground wall made of reinforced concrete for the purpose of blocking groundwater etc. when constructing an underground structure, is capable of blocking water at the time of excavation and passing water at the time of completion of excavation or after completion of the structure. It is a construction method, which is circular in the continuous underground wall,
A rectangular or polygonal tubular frame or grooved frame (hereinafter referred to as a special water passage frame) is installed in the vertical direction of the continuous underground wall to provide continuous water shielding and water passage functions. Water flow method on underground wall. 2. The special water-passing frames are arranged on the continuous underground walls on the left and right of the excavation part, and the special water-passing frames are connected to each other by a coarse-grained material or a pipe, and the continuous underground walls are used. The method for passing water through a continuous underground wall according to claim 1, wherein the interrupted groundwater is freely passed. 3. The special water-passing frame is provided on a continuous underground wall by using, for example, a perforated pipe having water passage holes, and the perforated pipe is installed before or after the perforated pipe is not installed. A tubular body made of a water-permeable stretchable material is inserted to form a double pipe structure, and a water pressure higher than the surrounding groundwater pressure is applied to the inside of the tubular body so that the tubular body is provided with an inner wall of the perforated pipe. 3. The water-passing method for a continuous underground wall according to claim 1 or 2, wherein the water is made to pass through the perforated pipe by removing the cylindrical body by closely contacting with the groundwater. 4. The special water-permeable frame is provided on a continuous underground wall by using, for example, a perforated pipe having water passage holes, and before or after the perforated pipe is built, a long pipe is provided inside the perforated pipe. Direction partition plate is inserted to form a two-chamber structure on the excavation side and the rock mass side, and the water pressure difference between the drilling side and the rock mass side presses the middle partition plate toward the low pressure side, and the middle partition plate and the The contact portion of the perforated pipe with the inner wall portion is in close contact to block water passage between the excavation side and the ground side, and then the partition plate is removed to cause water passage in the perforated pipe. A method for passing water through the continuous underground wall according to 1 or 2. 5. The special water passage frame is provided on a continuous underground wall by using, for example, a non-perforated pipe, the peripheral water is stopped by the non-perforated pipe and the continuous underground wall, and then the non-perforated pipe is provided. The water-passing method for a continuous underground wall according to claim 1 or 2, wherein water-passing holes are formed in the pipe to generate water permeability. 6. A special water-carrying frame having a depth smaller than the wall thickness of the continuous underground wall is installed on the natural ground side surface portion of the continuous underground wall, and a steel mesh is provided in the opening facing the natural ground. 2. A water passage sleeve that penetrates through the continuous underground wall is appropriately arranged on the back surface portion that is attached to the opening portion, and the water passage sleeve is closed when water is blocked and opened when water is passed. The water flow method on the continuous underground wall described in 2. 7. A coarse-grained material is filled in the special water-passing frame,
The water-passing method for a continuous underground wall according to claim 1 or 2, which prevents the inflow of surrounding soil and the like into the special water-passing frame. 8. A continuous underground wall made of reinforced concrete for the purpose of blocking groundwater etc. when constructing an underground structure is capable of blocking water when excavating and allowing water to pass when the excavation is completed or after the structure is completed. And a water passage pipe that penetrates the continuous underground wall in the thickness direction of the continuous underground wall, and a water passage portion that is connected to this water pipe and has a water collection box that has an opening on the ground side. A water-passing method for a continuous underground wall, in which the water-passing pipes are dispersedly arranged on the wall, and the water-passing pipes are closed when water is blocked and opened when water is passed.