JP7042687B2 - Weight balance water immersion method - Google Patents

Weight balance water immersion method Download PDF

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JP7042687B2
JP7042687B2 JP2018095463A JP2018095463A JP7042687B2 JP 7042687 B2 JP7042687 B2 JP 7042687B2 JP 2018095463 A JP2018095463 A JP 2018095463A JP 2018095463 A JP2018095463 A JP 2018095463A JP 7042687 B2 JP7042687 B2 JP 7042687B2
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underground skeleton
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明 石川
宏治 加藤
啓一 藤丸
博康 西
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Shimizu Corp
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Description

本発明は、地下工事に適用されるウェイトバランス水浸工法に関するものである。 The present invention relates to a weight balance water immersion method applied to underground construction.

従来、地下工事において地下水位低下のためにディープウェル（深井戸）を使用する方法が知られている（例えば、特許文献１を参照）。ポンプを稼働しているディープウェルでは、新設する地下躯体の浮力による浮き上がりを防止するため「躯体重量＞地下水による浮力」の条件を満たした後、ポンプ稼働停止とウェル閉塞を行っている。 Conventionally, a method of using a deep well (deep well) for lowering the groundwater level in underground construction has been known (see, for example, Patent Document 1). In the deep well where the pump is operating, the pump operation is stopped and the well is closed after satisfying the condition of "body weight> buoyancy due to groundwater" in order to prevent the newly installed underground skeleton from rising due to buoyancy.

図２は、従来の地下工事における排水設備（ディープウェル）の閉塞・撤去手順の一例を示したものである。この手順では、まず、図２（１）に示すように、地下躯体１を新設する領域Ａの周囲の地盤Ｇに止水壁２を構築するとともに、止水壁２の内外にディープウェル３（揚水井戸）とリチャージウェル４（注水井戸）とを設ける。そして、これらを配管５で接続することによって領域Ａ直下の地盤Ｇから止水壁２の外側に揚水（排水）する排水設備を構築し、各ウェル３，４内のポンプを稼働し、根切り・床付けを行う。続いて、図２（２）に示すように、領域Ａに地下躯体１を打設し、「躯体重量＞地下水による浮力（揚圧力）」の条件を満たすことを確認した後、領域Ａ直下の地盤Ｇからの揚水を停止する。最後に、図２（３）に示すように、ディープウェル３とリチャージウェル４を閉塞して配管５を撤去する。 FIG. 2 shows an example of the procedure for closing / removing the drainage facility (deep well) in the conventional underground construction. In this procedure, first, as shown in FIG. 2 (1), a water blocking wall 2 is constructed in the ground G around the area A where the underground skeleton 1 is newly installed, and deep wells 3 (deep wells 3 inside and outside the water blocking wall 2) are constructed. A pumping well) and a recharge well 4 (water injection well) will be provided. Then, by connecting these with a pipe 5, a drainage facility for pumping (draining) water from the ground G directly under the area A to the outside of the water blocking wall 2 is constructed, and the pumps in the wells 3 and 4 are operated to cut the roots.・ Install the floor. Subsequently, as shown in FIG. 2 (2), the underground skeleton 1 is placed in the area A, and after confirming that the condition of "body weight> buoyancy due to groundwater (lifting pressure)" is satisfied, it is directly under the area A. Stop pumping from ground G. Finally, as shown in FIG. 2 (3), the deep well 3 and the recharge well 4 are closed and the pipe 5 is removed.

特開２０１６－０７９５６７号公報Japanese Unexamined Patent Publication No. 2016-079567

しかしながら、上記条件を満たすまでの期間は通常、数ヶ月を要し、この間、（１）ディープウェル・リチャージウェル・配管等の仮設設備の撤去と閉塞ができない、（２）汲み上げた地下水を下水放流している場合には莫大な放流費用がかかる、などの問題があることから、現場コストの増大や工期の長期化を招くおそれがある。 However, it usually takes several months to meet the above conditions, and during this period, (1) temporary equipment such as deep wells, recharge wells, and pipes cannot be removed and closed, and (2) pumped groundwater is discharged into sewage. If this is the case, there are problems such as enormous discharge costs, which may lead to an increase in on-site costs and a longer construction period.

新設の地下躯体を打設した後に、できる限り早期に地下水の揚水を停止できれば、その分だけ現場コスト・工期に対して有利となるので好ましい。このため、新設の地下躯体を構築した後に、早期に地下水の揚水を停止することのできる技術が求められていた。 It is preferable if the pumping of groundwater can be stopped as soon as possible after the new underground skeleton is placed, because it will be advantageous for the site cost and construction period. For this reason, there has been a demand for a technology that can stop the pumping of groundwater at an early stage after constructing a new underground skeleton.

本発明は、上記に鑑みてなされたものであって、地下躯体を構築した後に、早期に地下水の揚水を停止することのできるウェイトバランス水浸工法を提供することを目的とする。 The present invention has been made in view of the above, and an object of the present invention is to provide a weight-balanced water immersion method capable of stopping the pumping of groundwater at an early stage after constructing an underground skeleton.

上記した課題を解決し、目的を達成するために、本発明に係るウェイトバランス水浸工法は、地下躯体を構築する際に、地下水の浮力による地下躯体の浮き上がりを防止する水浸工法であって、地下躯体を構築する領域の下側の地下水を外部に排水するための排水設備を地中に設置するステップと、その後、排水設備を稼働しながら地下躯体を構築する一方で、地下水の浮力に対抗させるためのバランス用のウェイト水を地下躯体に付加するステップと、その後、ウェイト水を付加した地下躯体の重量が地下水の浮力を上回った場合に、排水設備の機能を停止するステップとを備えることを特徴とする。 In order to solve the above-mentioned problems and achieve the object, the weight balance water immersion method according to the present invention is a water immersion method for preventing the underground skeleton from rising due to the buoyancy of the groundwater when constructing the underground skeleton. , The step of installing a drainage facility in the ground to drain the groundwater below the area where the underground skeleton is to be constructed, and then the buoyancy of the groundwater while constructing the underground skeleton while operating the drainage facility. It includes a step of adding weight water for balance to the underground skeleton for countering, and then a step of stopping the function of the drainage facility when the weight of the underground skeleton to which the weight water is added exceeds the buoyancy of the groundwater. It is characterized by that.

また、本発明に係る他のウェイトバランス水浸工法は、上述した発明において、地下躯体の構築の進捗により地下躯体の重量が増加するにしたがって、地下躯体に付加されたウェイト水を外部に排水するステップをさらに備えることを特徴とする。 Further, in the other weight balance water immersion method according to the present invention, in the above-mentioned invention, as the weight of the underground skeleton increases due to the progress of the construction of the underground skeleton, the weight water added to the underground skeleton is drained to the outside. It is characterized by further providing steps.

また、本発明に係る他のウェイトバランス水浸工法は、上述した発明において、ウェイト水として、消毒または殺菌作用を有する薬剤を含む水を用いることを特徴とする。 Further, another weight balance water immersion method according to the present invention is characterized in that, in the above-mentioned invention, water containing a chemical having a disinfecting or bactericidal action is used as the weight water.

本発明に係るウェイトバランス水浸工法によれば、地下躯体を構築する際に、地下水の浮力による地下躯体の浮き上がりを防止する水浸工法であって、地下躯体を構築する領域の下側の地下水を外部に排水するための排水設備を地中に設置するステップと、その後、排水設備を稼働しながら地下躯体を構築する一方で、地下水の浮力に対抗させるためのバランス用のウェイト水を地下躯体に付加するステップと、その後、ウェイト水を付加した地下躯体の重量が地下水の浮力を上回った場合に、排水設備の機能を停止するステップとを備えるので、ウェイト水によって地下躯体の重量を増すことができ、従来の方法に比べて早期に地下水の排水（揚水）を停止することができるという効果を奏する。 According to the weight balance water immersion method according to the present invention, when constructing an underground skeleton, it is a water immersion method that prevents the underground skeleton from rising due to the buoyancy of the groundwater, and is the groundwater below the area where the underground skeleton is constructed. The step of installing a drainage facility in the ground to drain the water to the outside, and then, while constructing the underground skeleton while operating the drainage facility, the weight water for balance to counter the buoyancy of the groundwater is used as the underground skeleton. Since the step of adding to the groundwater and the step of stopping the function of the drainage facility when the weight of the groundwater to which the weight water is added exceeds the buoyancy of the groundwater, the weight of the groundwater should be increased by the weight water. This has the effect of stopping the drainage (pumping) of groundwater earlier than the conventional method.

また、本発明に係る他のウェイトバランス水浸工法によれば、地下躯体の構築の進捗により地下躯体の重量が増加するにしたがって、地下躯体に付加されたウェイト水を外部に排水するステップをさらに備えるので、地下工事の施工効率を向上することができるという効果を奏する。 Further, according to another weight balance water immersion method according to the present invention, as the weight of the underground skeleton increases due to the progress of the construction of the underground skeleton, the step of draining the weight water added to the underground skeleton to the outside is further increased. Since it is prepared, it has the effect of improving the construction efficiency of underground construction.

また、本発明に係る他のウェイトバランス水浸工法によれば、ウェイト水として、消毒または殺菌作用を有する薬剤を含む水を用いるので、構築後の地下躯体の衛生的環境を良好にすることができるという効果を奏する。 Further, according to another weight balance water immersion method according to the present invention, water containing a chemical having a disinfecting or bactericidal action is used as the weight water, so that the hygienic environment of the underground skeleton after construction can be improved. It has the effect of being able to do it.

図１は、本発明に係るウェイトバランス水浸工法の実施の形態を示す施工手順図であり、（１）は根切り・床付け、（２）は地下躯体打設、ウェイト水注水、揚水停止、（３）は排水設備の閉塞・撤去、（４）は躯体立上げとウェイト水コントロールである。FIG. 1 is a construction procedure diagram showing an embodiment of the weight balance water immersion method according to the present invention, in which (1) is root cutting / flooring, and (2) is underground skeleton placement, weight water injection, and pumping stop. , (3) is the blockage / removal of the drainage facility, and (4) is the skeleton start-up and weight water control. 図２は、従来の排水設備の閉塞・撤去手順を示す図であり、（１）は根切り・床付け、（２）は地下躯体打設、揚水停止、（３）は排水設備の閉塞・撤去の例である。FIG. 2 is a diagram showing the procedure for closing / removing the conventional drainage facility. (1) is root cutting / flooring, (2) is underground skeleton placement and pumping stop, and (3) is blockage / removal of the drainage facility. This is an example of removal.

以下に、本発明に係るウェイトバランス水浸工法の実施の形態を図面に基づいて詳細に説明する。なお、この実施の形態によりこの発明が限定されるものではない。 Hereinafter, embodiments of the weight balance water immersion method according to the present invention will be described in detail with reference to the drawings. The present invention is not limited to this embodiment.

本実施の形態は、地下躯体を構築する際に、地下水の浮力による地下躯体の浮き上がりを防止するために用いる排水設備を早期に撤去するための地下工法である。 This embodiment is an underground construction method for early removal of the drainage facility used to prevent the underground skeleton from rising due to the buoyancy of the groundwater when constructing the underground skeleton.

図１（１）に示すように、まず、従来の方法と同様に、予め領域Ａの周囲の地盤Ｇに止水壁１０を構築するとともに、止水壁１０で囲まれた内側にディープウェル１２（揚水井戸）を設けるとともに、止水壁１０の外側にリチャージウェル１４（注水井戸）を設ける。そして、ディープウェル１２とリチャージウェル１４を配管１６で接続することによって排水設備１８を構築する。その後、各ウェル１２、１４内のポンプを稼働して排水設備１８を稼働し、領域Ａ直下の地盤Ｇから止水壁１０の外側に向けて地下水Ｗを揚水（排水）して地下水位ＷＬを制御しながら、領域Ａについて根切り・床付けを行う。 As shown in FIG. 1 (1), first, as in the conventional method, a water blocking wall 10 is constructed in advance on the ground G around the region A, and a deep well 12 is formed inside the water blocking wall 10. A (pumping well) is provided, and a recharge well 14 (water injection well) is provided on the outside of the water blocking wall 10. Then, the drainage facility 18 is constructed by connecting the deep well 12 and the recharge well 14 with the pipe 16. After that, the pumps in the wells 12 and 14 are operated to operate the drainage facility 18, and the groundwater W is pumped (drained) from the ground G directly under the area A toward the outside of the water blocking wall 10 to raise the groundwater level WL. While controlling, root cutting and flooring are performed for area A.

次に、図１（２）に示すように、排水設備１８を稼働しながら、領域Ａにコンクリートを打設して地下躯体２０を構築する。これにより、地下躯体２０の内部に排水ピット２２が形成されるとともに、外壁２４の内部に空間２６が形成される。この排水ピット２２や内部空間２６にバランス用のウェイト水２８を注入する。 Next, as shown in FIG. 1 (2), while operating the drainage facility 18, concrete is poured into the area A to construct the underground skeleton 20. As a result, the drainage pit 22 is formed inside the underground skeleton 20, and the space 26 is formed inside the outer wall 24. Weight water 28 for balance is injected into the drainage pit 22 and the internal space 26.

ウェイト水２８には、例えば水道水や地下水を用いることができる。また、必要に応じて次亜塩素酸などの消毒および殺菌作用を有する酸化剤等の薬剤を混合した水をウェイト水として用いてもよい。このようにすれば、後工程でウェイト水２８を排水した後の地下躯体２０の内部空間２６等の衛生環境を、良好な状態に保持することができる。 For the weight water 28, for example, tap water or groundwater can be used. Further, if necessary, water mixed with a chemical such as an oxidizing agent having a disinfecting and bactericidal action such as hypochlorous acid may be used as weight water. By doing so, the sanitary environment such as the internal space 26 of the underground skeleton 20 after draining the weight water 28 in the post-process can be maintained in a good state.

ウェイト水２８を注入した分だけ地下躯体２０の重量が増し、地下水の浮力に対抗する力が増大する。その後、ウェイト水２８を含めた地下躯体２０の重量が地下水の浮力（揚圧力）を上回ることが確認されたら、排水設備１８の稼働を停止して揚水を停止する。 The weight of the underground skeleton 20 increases by the amount of the weight water 28 injected, and the force against the buoyancy of the groundwater increases. After that, when it is confirmed that the weight of the underground skeleton 20 including the weight water 28 exceeds the buoyancy (lifting pressure) of the groundwater, the operation of the drainage facility 18 is stopped and the pumping is stopped.

次に、図１（３）に示すように、ディープウェル１２、リチャージウェル１４を閉塞して配管１６等の排水設備１８を撤去する。このように、本実施の形態によれば、ウェイト水２８の注入によって地下躯体２０の重量を増すことができるため、従来の方法と比べて早い段階で排水設備１８を撤去可能である。 Next, as shown in FIG. 1 (3), the deep well 12 and the recharge well 14 are closed, and the drainage facility 18 such as the pipe 16 is removed. As described above, according to the present embodiment, since the weight of the underground skeleton 20 can be increased by injecting the weight water 28, the drainage facility 18 can be removed at an earlier stage than the conventional method.

次に、図１（４）に示すように、工事の進捗により地下躯体２０が立ち上がり地下躯体２０の重量が増加するにしたがって、地下水の浮力とのバランスを取りながら、ウェイト水２８をポンプＰで外部に排水し、清掃やその他の躯体工事を実施する。これにより、地下工事の施工効率を向上することができる。 Next, as shown in FIG. 1 (4), as the underground skeleton 20 rises and the weight of the underground skeleton 20 increases due to the progress of the construction, the weight water 28 is pumped by the pump P while balancing with the buoyancy of the groundwater. Drain to the outside and carry out cleaning and other skeleton work. As a result, the construction efficiency of underground construction can be improved.

このように、本実施の形態によれば、従来の方法に比べて早期に地下水の揚水を停止可能である。これにより、早期に排水設備１８を撤去することができるため、現場コストを従来の方法よりも低減して、施工期間を短縮化することが可能となる。 As described above, according to the present embodiment, the pumping of groundwater can be stopped earlier than the conventional method. As a result, the drainage facility 18 can be removed at an early stage, so that the site cost can be reduced as compared with the conventional method and the construction period can be shortened.

なお、上記の実施の形態では、ディープウェル１２から揚水した地下水をリチャージウェル１４に復水するリチャージ工法に適用した場合を例にとり説明したが、本発明はこれに限るものではなく、領域Ａの直下地盤の地下水を低下させる工事であればいかなる地下工事にも適用可能である。例えばディープウェルから揚水した地下水を復水せずに外部に排水する工事に適用してもよい。このように、本発明はリチャージウェルを用いない工事にも適用することができる。 In the above embodiment, the case where the groundwater pumped from the deep well 12 is restored to the recharge well 14 has been described as an example, but the present invention is not limited to this, and the present invention is not limited to this. It can be applied to any underground work as long as it is a work that lowers the groundwater of the direct ground board. For example, it may be applied to the construction of draining the groundwater pumped from the deep well to the outside without condensing it. As described above, the present invention can also be applied to construction work that does not use a recharge well.

以上説明したように、本発明に係るウェイトバランス水浸工法によれば、地下躯体を構築する際に、地下水の浮力による地下躯体の浮き上がりを防止する水浸工法であって、地下躯体を構築する領域の下側の地下水を外部に排水するための排水設備を地中に設置するステップと、その後、排水設備を稼働しながら地下躯体を構築する一方で、地下水の浮力に対抗させるためのバランス用のウェイト水を地下躯体に付加するステップと、その後、ウェイト水を付加した地下躯体の重量が地下水の浮力を上回った場合に、排水設備の機能を停止するステップとを備えるので、ウェイト水によって地下躯体の重量を増すことができ、従来の方法に比べて早期に地下水の排水（揚水）を停止することができる。 As described above, according to the weight balance water immersion method according to the present invention, when constructing the groundwater, it is a water immersion method that prevents the groundwater from rising due to the buoyancy of the groundwater, and constructs the groundwater. For the step of installing a drainage facility in the ground to drain the groundwater under the area to the outside, and then for the balance to counter the buoyancy of the groundwater while constructing the underground skeleton while operating the drainage facility. Since the step of adding the weight water to the groundwater and then the step of stopping the function of the drainage facility when the weight of the groundwater to which the weight water is added exceeds the buoyancy of the groundwater, the weight water is used underground. The weight of the skeleton can be increased, and the drainage (pumping) of groundwater can be stopped earlier than the conventional method.

また、本発明に係る他のウェイトバランス水浸工法によれば、地下躯体の構築の進捗により地下躯体の重量が増加するにしたがって、地下躯体に付加されたウェイト水を外部に排水するステップをさらに備えるので、地下工事の施工効率を向上することができる。 Further, according to another weight balance water immersion method according to the present invention, as the weight of the underground skeleton increases due to the progress of the construction of the underground skeleton, the step of draining the weight water added to the underground skeleton to the outside is further increased. Therefore, it is possible to improve the construction efficiency of underground construction.

また、本発明に係る他のウェイトバランス水浸工法によれば、ウェイト水として、消毒または殺菌作用を有する薬剤を含む水を用いるので、構築後の地下躯体の衛生的環境を良好にすることができる。 Further, according to another weight balance water immersion method according to the present invention, water containing a chemical having a disinfecting or bactericidal action is used as the weight water, so that the hygienic environment of the underground skeleton after construction can be improved. can.

以上のように、本発明に係るウェイトバランス水浸工法は、地下水位低下のためにディープウェル等の排水設備を使用する地下工事に有用であり、特に、早期に排水設備を撤去するのに適している。 As described above, the weight balance water immersion method according to the present invention is useful for underground construction using a drainage facility such as a deep well for lowering the groundwater level, and is particularly suitable for removing the drainage facility at an early stage. ing.

１０ 止水壁
１２ ディープウェル
１４ リチャージウェル
１６ 配管
１８ 排水設備
２０ 地下躯体
２２ 排水ピット
２４ 外壁
２６ 内部空間
２８ ウェイト水
Ａ 領域
Ｇ 地盤
Ｐ ポンプ
Ｗ 地下水
ＷＬ 地下水位 10 Water stop wall 12 Deep well 14 Recharge well 16 Piping 18 Drainage facility 20 Underground frame 22 Drainage pit 24 Outer wall 26 Internal space 28 Weight water A area G Ground P Pump W Groundwater WL Groundwater level

Claims (3)

地下躯体を構築する際に、地下水の浮力による地下躯体の浮き上がりを防止する水浸工法であって、
地下躯体を構築する領域の下側の地下水を外部に排水するための排水設備を地中に設置するステップと、その後、排水設備を稼働しながら地下躯体を構築する一方で、地下水の浮力に対抗させるためのバランス用のウェイト水を地下躯体に付加するステップと、その後、ウェイト水を付加した地下躯体の重量が地下水の浮力を上回った場合に、排水設備の機能を停止するステップとを備えることを特徴とするウェイトバランス水浸工法。 It is a water immersion method that prevents the underground skeleton from rising due to the buoyancy of the groundwater when constructing the underground skeleton.
A step to install a drainage facility in the ground to drain the groundwater below the area where the underground skeleton is to be constructed, and then to build the underground skeleton while operating the drainage facility while countering the buoyancy of the groundwater. It is provided with a step of adding weight water for balance to the underground skeleton for making the weight water, and then a step of stopping the function of the drainage facility when the weight of the underground skeleton to which the weight water is added exceeds the buoyancy of the groundwater. Weight balance water immersion method featuring. 地下躯体の構築の進捗により地下躯体の重量が増加するにしたがって、地下躯体に付加されたウェイト水を外部に排水するステップをさらに備えることを特徴とする請求項１に記載のウェイトバランス水浸工法。 The weight balance water immersion method according to claim 1, further comprising a step of draining the weight water added to the underground skeleton to the outside as the weight of the underground skeleton increases due to the progress of the construction of the underground skeleton. .. ウェイト水として、消毒または殺菌作用を有する薬剤を含む水を用いることを特徴とする請求項１または２に記載のウェイトバランス水浸工法。 The weight balance water immersion method according to claim 1 or 2, wherein as the weight water, water containing a chemical having a disinfecting or bactericidal action is used.
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