JPH0312811Y2 - - Google Patents
Info
- Publication number
- JPH0312811Y2 JPH0312811Y2 JP11565684U JP11565684U JPH0312811Y2 JP H0312811 Y2 JPH0312811 Y2 JP H0312811Y2 JP 11565684 U JP11565684 U JP 11565684U JP 11565684 U JP11565684 U JP 11565684U JP H0312811 Y2 JPH0312811 Y2 JP H0312811Y2
- Authority
- JP
- Japan
- Prior art keywords
- water
- underground continuous
- continuous wall
- foundation
- stopping
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 238000007689 inspection Methods 0.000 claims description 9
- 238000007789 sealing Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 3
- 239000011435 rock Substances 0.000 description 14
- 238000010276 construction Methods 0.000 description 5
- 230000005856 abnormality Effects 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 230000001771 impaired effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000010426 asphalt Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- -1 that is Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Description
【考案の詳細な説明】
〔産業上の利用分野〕
本考案はコンクリートダムにおける基礎地盤の
止水構造に関するものである。[Detailed description of the invention] [Field of industrial application] The present invention relates to a water-stop structure for the foundation ground of a concrete dam.
ダム基礎岩盤の浸透流を抑制する工法、すなわ
ち止水工法としては、グラウチング工法が最も一
般的である。
Grouting is the most common construction method for suppressing seepage flow through dam foundation rock, that is, water stoppage construction method.
ところが、軟岩のように岩そのものの透水性が
高い岩盤や、砂礫地盤などにおいては、グラウチ
ングによつて止水性を高めることが技術的に困難
な場合が多く、仮に改良が可能となる場合であつ
ても工費の点で問題となることが多い。 However, it is often technically difficult to improve the water-stopping properties of grouting in rock that has high water permeability, such as soft rock, or gravel ground, and even if it were possible to improve it, However, there are often problems in terms of construction costs.
そこで、グラウチングによる改良が困難な岩盤
に対する止水工法として、コンクリート提体に対
して一体的な構造とする地下連続壁を利用する工
法が検討されつつあるが、この工法は部分的に採
用された例はあるものの、コンクリートダム基礎
岩盤の主たる止水工法として採用された実績はな
い。その理由は、ダムに作用する荷重により提体
および岩盤が変形、変位するが、その挙動を正確
に把握することが不可能であり、そのため地下連
続壁自体あるいは地下連続壁と提体との接合部の
止水性を長期に亘つて良好に維持することが困難
となるからである。 Therefore, as a water-stopping method for bedrock that is difficult to improve by grouting, a construction method using an underground continuous wall that is an integral structure with the concrete structure is being considered, but this construction method has been partially adopted. Although there are examples, there is no record of it being used as the main water stoppage method for concrete dam foundation rocks. The reason for this is that the load acting on the dam deforms and displaces the dam and the rock mass, but it is impossible to accurately understand this behavior. This is because it becomes difficult to maintain good water-tightness over a long period of time.
すなわち、例えば第３図に示すように基礎岩盤
Ａの変形係数が地下連続壁Ｂの変形係数より小さ
い場合であると、提体Ｃや貯えられている水Ｗ等
によつて基礎岩盤Ａに長期に亘つて高荷重が加え
られる際、提体Ｃと一体構造となつている地下連
続壁Ｂに応力が集中してしまい、これがもとで地
下連続壁ＢにクラツクD1（第４図参照）が発生し
てしまうおそれがあり、また地震が発生した場合
には、第５図に示すように提体Ｃと基礎岩盤Ａの
挙動の違いにより、提体Ｃとそれと一体的構造と
なつた地下連続壁Ｂとの接合部に応力が集中して
しまい、その部分にクラツクD2が発生してしま
うおそれがある。そしてこれらクラツクD1，D2
を介して上流側の基礎岩盤から下流側の基礎岩盤
へ漏水し、止水性が損なわれるおそれがあるので
ある。 In other words, if the deformation coefficient of the foundation rock A is smaller than that of the underground continuous wall B, as shown in Fig. 3, for example, the foundation rock A will undergo long-term deformation due to the structure C, stored water W, etc. When a high load is applied over a period of time, stress concentrates on underground continuous wall B, which is an integral structure with structure C, and this causes crack D 1 in underground continuous wall B (see Figure 4). If an earthquake occurs, as shown in Figure 5, due to the difference in behavior between structure C and foundation rock A, structure C and the underground structure integrated with it may be destroyed. There is a risk that stress will be concentrated at the joint with the continuous wall B, and a crack D2 will occur in that part. And these cracks D 1 , D 2
There is a risk that water may leak from the upstream foundation rock to the downstream foundation rock through the water, impairing water-stopping properties.
また、通常のダムにおいては一般に、内部にギ
ヤラリと呼ばれる監査廊を設け、この廊を介して
ダム内部の応力測定や基礎岩盤の水圧測定を行う
とともに、仮に異常が生じた場合には、監査廊を
介して容易に対処し得るようになつているが、前
述のグラウチングによる止水工法を採用したダム
にあつては、止水性の損なわれる個所が定まつて
おらず、例えば監査廊から遠く離れた個所で止水
性が損なわれた場合、対処が難かしい等の欠点が
あつた。 In addition, normal dams generally have an inspection gallery called a gallery inside, and this gallery is used to measure the stress inside the dam and the water pressure of the foundation rock, and if an abnormality occurs, the inspection gallery However, in the case of dams that use the above-mentioned grouting water-stopping method, the locations where the water-stopping performance is impaired are not determined, and for example, if the water-stopping property is impaired, However, there were drawbacks such as difficulty in dealing with the loss of water-stopping properties in places where water was removed.
本考案は上記事情に鑑みてなされたもので、地
下連続壁自体および同地下連続壁と提体との接合
部分の止水性を長期に亘つて良好に維持すること
ができ、かつ仮に止水性が損なわれた場合であつ
ても、容易かつ迅速に対処することができるコン
クリートダムにおける基礎地盤の止水構造を提供
することを目的とする。
The present invention was developed in view of the above circumstances, and it is possible to maintain good water-stopping properties of the underground continuous wall itself and the joint between the underground continuous wall and the structure over a long period of time, and even if the water-stopping property is The purpose of the present invention is to provide a water-stopping structure for the foundation ground in a concrete dam that can be easily and quickly dealt with even if it is damaged.
かかる目的を達成するために、本考案では提体
と地下連続壁とを、ゴム等の柔軟性材料からなる
シール部材を介して変位可能に接続し、かつ提体
と地下連続壁との接合部分近傍に監査廊を配置し
た構成としてある。
In order to achieve this purpose, the present invention connects the support body and the underground continuous wall so that they can be displaced via a sealing member made of a flexible material such as rubber, and The structure has an inspection gallery located nearby.
第１図は本考案の一実施例の要部であつて前記
第３図の円部に相当する個所を示している。図
中符合１は基礎岩盤Ａ内に打設されたコンクリー
ト地下連続壁で、この地下連続壁１の上部は岩盤
Ａから突出している。一方、２はコンクリート提
体で、この提体２には地下連続壁１に対向する下
側部分に凹部３が形成され、この凹部３には前記
地下連続壁１の上部突出部分に嵌合する断面コ字
状のゴム製等シール部材４が嵌合されている。そ
して、シール部材４の提体２と当接する面および
地下連続壁１と当接する面にはそれぞれ、アスフ
アルト乳剤５が塗布されており、これによりシー
ル部材４はこれら提体２および地下連続壁１に対
して縁切りされている。またシール部材４の上面
と底部との間の厚さ寸法ａ、およびその他の寸法
は、ダム高、岩盤Ａの変形係数等によつて推定さ
れる提体２の沈下量を基に決定されている。
FIG. 1 shows a main part of an embodiment of the present invention, which corresponds to the circular part in FIG. 3. Reference numeral 1 in the figure indicates a concrete underground continuous wall cast within the foundation bedrock A, and the upper part of this underground continuous wall 1 protrudes from the bedrock A. On the other hand, reference numeral 2 denotes a concrete frame, and a recess 3 is formed in the lower part of the frame 2 facing the underground continuous wall 1, and the upper protruding part of the underground continuous wall 1 fits into this recess 3. A seal member 4 made of rubber or the like and having a U-shaped cross section is fitted. Asphalt emulsion 5 is applied to the surfaces of the sealing member 4 that come into contact with the body 2 and the surface that comes into contact with the underground continuous wall 1, so that the sealing member 4 It has been cut off against. In addition, the thickness dimension a between the top surface and the bottom of the sealing member 4 and other dimensions are determined based on the amount of subsidence of the structure 2 estimated from the dam height, the deformation coefficient of the rock mass A, etc. There is.
また、提体２の内部にはギヤラリ（監査廊）６
が、地下連続壁１の近傍（本図示例の場合は真
上）に同地下連続壁１に沿つて設けられている。
このギヤラリ６は、ダム内部の応力を測定した
り、下流側基礎岩盤A0内の間隙水圧を測定した
りするためのものであり、かつ間隙水圧に異常が
認められた場合それに容易かつ迅速に対処するた
めのものである。すなわち、間隙水圧に異常が認
められた場合このギヤラリ６の底部に図中２点鎖
線で示すようにボーリング等によつて孔７を形成
し、この孔７を利用して下流側岩盤A0に止水機
能を有すべくグラウチングを施すのである。 In addition, there is a gallery (inspection gallery) 6 inside the body 2.
is provided along the underground continuous wall 1 in the vicinity of the underground continuous wall 1 (in the illustrated example, directly above it).
This gear 6 is used to measure the stress inside the dam and the pore water pressure in the downstream foundation rock A0 , and can be used to easily and quickly detect any abnormality in the pore water pressure. This is to deal with it. That is, if an abnormality is found in the pore water pressure, a hole 7 is formed at the bottom of the gear gallery 6 by boring or the like as shown by the two-dot chain line in the figure, and this hole 7 is used to drill into the downstream bedrock A 0 . Grouting is used to provide a water-stopping function.
第２図は本考案の他の実施例を示している。本
実施例においては、地下連続壁１１を多重（本図
示例の場合２重）に配し、かつそれぞれの地下連
続壁１１に対応してそれらの上側にギヤラリ（監
査廊）１２を配置している。このような構成にす
れば止水性をより高めることができ、かつ仮に間
隙水圧に異常が認められた場合であつても、両地
下連続壁１１間にグラウチングを施すだけで、確
実な補修を行なうことができる。 FIG. 2 shows another embodiment of the invention. In this embodiment, underground continuous walls 11 are arranged in multiple layers (double in the illustrated example), and a gallery (inspection gallery) 12 is arranged above each underground continuous wall 11. There is. With such a configuration, water stoppage performance can be further improved, and even if an abnormality is found in the pore water pressure, reliable repair can be carried out simply by grouting between both underground continuous walls 11. be able to.
なお、上記実施例においては、ギヤラリ一個に
対して１つの地下連続壁を対向させているが、こ
れに限られることなく、１つのギヤラリに対して
複数の地下連続壁１１を対応配置させてもよい。 In addition, in the above embodiment, one underground continuous wall 11 is arranged to face one gear rally, but the invention is not limited to this, and a plurality of underground continuous walls 11 may be arranged correspondingly to one gear rally. good.
以上説明したように本考案によれば、提体と地
下連続壁とを柔軟性材料からなるシール部材を介
して接続し、かつ提体と地下連続壁との接合部分
近傍に監査廊を配置した構成であるから、基礎岩
盤の変形係数が地下連続壁の変形係数より小さい
場合であつても、提体や貯えられている水による
荷重が地下連続壁に集中して加わることがなく、
地下連続壁にクラツクが生じるのを防止すること
ができる。また地震が発生した場合であつても、
提体と地下連続壁とは各々独立して動き得るた
め、両者の接合部分に応力が集中することがな
く、同接合部分が損傷するのを防止することがで
きる。この結果、地下連続壁自体および同地下連
続壁と提体との接合部分の止水性を長期に亘つて
良好に維持することができる。
As explained above, according to the present invention, the structure and the underground continuous wall are connected through a sealing member made of a flexible material, and the inspection gallery is arranged near the joint between the structure and the underground continuous wall. Because of this structure, even if the deformation coefficient of the foundation rock is smaller than the deformation coefficient of the underground continuous wall, the load from the structure and stored water will not be concentrated on the underground continuous wall.
Cracks can be prevented from occurring in underground continuous walls. Also, even if an earthquake occurs,
Since the support body and the underground continuous wall can each move independently, stress is not concentrated at the joint between the two, and damage to the joint can be prevented. As a result, the water-tightness of the underground continuous wall itself and the joint between the underground continuous wall and the support body can be maintained satisfactorily over a long period of time.
また仮に、止水性が損なわれた場合であつて
も、監査廊を介して提体と地下連続壁との接合部
分に近づき、止水機能を有するべく補修を容易か
つ迅速に行なうことができる等の効果を奏する。 In addition, even if the water-stopping property is impaired, it is possible to approach the joint between the structure and the underground continuous wall through the inspection gallery and repair it easily and quickly to maintain the water-stopping function. It has the effect of
第１図は本考案の一実施例を示す要部の側断面
図、第２図は本考案の他の実施例を示す側断面
図、第３図はコンクリートダムの一従来例を示す
側断面図、第４図および第５図は第３図の円部
の拡大断面図である。
Ａ，A0……基礎岩盤、１，１１……地下連続
壁、２……提体、３……凹部、４……シール部
材、５……アスフアルト乳剤、６，１２……ギヤ
ラリ（監査廊）。
Fig. 1 is a side sectional view of the main part showing one embodiment of the present invention, Fig. 2 is a side sectional view showing another embodiment of the invention, and Fig. 3 is a side sectional view showing a conventional example of a concrete dam. 4 and 5 are enlarged sectional views of the circular portion of FIG. 3. A, A 0 ...Foundation bedrock, 1,11...Underground continuous wall, 2...Structure body, 3...Concavity, 4...Seal member, 5...Asphalt emulsion, 6,12...Gearly (inspection gallery) ).
Claims (1)
とが、ゴム等の柔軟性材料からなるシール部材を
介して変位可能に接続され、かつこの提体と地下
連続壁との接合部分近傍に監査廊が配置されてい
ることを特徴とするコンクリートダムにおける基
礎地盤の止水構造。 The structure and the underground continuous wall for water-shielding water provided at the bottom of the structure are movably connected via a sealing member made of a flexible material such as rubber, and the structure is located near the joint between the structure and the continuous underground wall. A water-stop structure for the foundation ground of a concrete dam characterized by having an inspection gallery located at the bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11565684U JPS6132221U (en) | 1984-07-28 | 1984-07-28 | Water stop structure of foundation ground in concrete dam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11565684U JPS6132221U (en) | 1984-07-28 | 1984-07-28 | Water stop structure of foundation ground in concrete dam |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6132221U JPS6132221U (en) | 1986-02-26 |
| JPH0312811Y2 true JPH0312811Y2 (en) | 1991-03-26 |
Family
ID=30674615
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11565684U Granted JPS6132221U (en) | 1984-07-28 | 1984-07-28 | Water stop structure of foundation ground in concrete dam |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6132221U (en) |
-
1984
- 1984-07-28 JP JP11565684U patent/JPS6132221U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6132221U (en) | 1986-02-26 |
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