JPH02296930A - Construction of manhole for underground power transmission line - Google Patents

Construction of manhole for underground power transmission line

Info

Publication number
JPH02296930A
JPH02296930A JP1115895A JP11589589A JPH02296930A JP H02296930 A JPH02296930 A JP H02296930A JP 1115895 A JP1115895 A JP 1115895A JP 11589589 A JP11589589 A JP 11589589A JP H02296930 A JPH02296930 A JP H02296930A
Authority
JP
Japan
Prior art keywords
block
cutting edge
power transmission
groundwater
underground power
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.)
Pending
Application number
JP1115895A
Other languages
Japanese (ja)
Inventor
Hatsuo Ogata
緒方 初雄
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KYUSHU KOATSU CONCRETE KOGYO KK
Original Assignee
KYUSHU KOATSU CONCRETE KOGYO KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by KYUSHU KOATSU CONCRETE KOGYO KK filed Critical KYUSHU KOATSU CONCRETE KOGYO KK
Priority to JP1115895A priority Critical patent/JPH02296930A/en
Publication of JPH02296930A publication Critical patent/JPH02296930A/en
Pending legal-status Critical Current

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  • Underground Structures, Protecting, Testing And Restoring Foundations (AREA)

Abstract

PURPOSE:To lower a block by a method wherein with the inside of a cylindrical concrete block provided with a cutting edge on the lower end exposed to the atmosphere ground water is taken into the block so that sediment in the block can be dug. CONSTITUTION:A friction cut 10 is formed on the outer periphery of the lower end of a vertically cylindrical concrete block 2 in a rectangle shape while a cutting edge 1 is formed or the inner periphery of the lower end. A supporting stage 12 of a concrete bottom plate 11 is formed on the upper end of the cutting edge 1' while a concrete engaging groove 13 is formed on the inner peripheral face immediately above the stage 12. A horizontal pneumatic tube 14 is buried on the bottom face 1'' formed on the lowered end of the cutting edge 1', and pneumatic exhaust nozzles 6 are provided with constant intervals to have them opened on the bottom face 1''. Further a plurality of vertical pneumatic tubes 14' are buried on the side wall of the block 2 to have their lower ends communicated with the horizontal tube 14. The upper end is protruded from the upper end face of the side wall to be connected to an air presser 17 via a compressed air tube 15.

Description

【発明の詳細な説明】 「産業上の利用分野」 本発明は地下に敷設した送電線ダクトの接続部マンホー
ルの施行法に関するものである「従来の技術」 従来、地下送電線ダクトの接続部マンホールを地中に埋
設するため下端に刃口を有する長方形筒状コンクリート
ブロックを下向に推進させる工法が行われた。即ち刃口
の内周及び直下にある土砂を人力で排除することによっ
て自重沈降させるものである。そして地下水位下に推進
すると上記ブロック内に地下水が湧出するためこれをポ
ンプで排水しなければならない。ところが地下水位の水
圧によって月日直下の土砂が地下水と共に崩解して該ブ
ロック内に一度に地下水が出水する所謂ボイリング現象
によって屡々作業を中断しなければならないという問題
がある。
[Detailed Description of the Invention] ``Industrial Application Field'' The present invention relates to a method for implementing a connecting manhole in an underground power transmission line duct.``Prior Art'' In order to bury it underground, a construction method was used in which a rectangular cylindrical concrete block with a cutting edge at the bottom was pushed downward. In other words, the earth and sand on the inner periphery of the cutting edge and directly below it are manually removed to allow it to settle under its own weight. When the water is pushed below the groundwater level, groundwater will gush out into the blocks, which must be drained with a pump. However, there is a problem in that the work often has to be interrupted due to the so-called boiling phenomenon in which the earth and sand just below the block collapses together with the groundwater due to the water pressure of the groundwater level, causing groundwater to leak into the block all at once.

「発明が解決しようとする課題」 本発明は上記ボイリング現象を防止しかつ人力を要せず
に地下送N線用のマンホールを施工することを目的とす
る。
"Problems to be Solved by the Invention" The present invention aims to prevent the above-mentioned boiling phenomenon and to construct a manhole for the underground transmission line N without requiring human labor.

「課題を解決するための手段」 上記の目的を達成するため本発明は下端に刃口な設けた
筒状コンクリートブロックを地下水位下に下向に推進す
るに際し、該ブロック内を大気に開放した状態において
地下水を該ブロック内に取込み、該地下水を排水するこ
となく該ブロック内の中央部の土砂を掘削し、刃口から
圧気を噴出させることにより該圧気によって刃口直下及
び刃口内周の土砂を中央部に向って排除し、上記ブロッ
クを自重によって下降推進させることを特徴とする地下
送電線用マンホール施工法 刃口に複数の下向圧気噴出口を有する上記発明記載の地
下送電線用マンホール施工法 下降推進を終了し、上記刃口内周に基礎石を充填した後
上記ブロック内の地下水を排水する上記第1又は第2の
発明記載の地下送電線用マンホール施工法によって構成
する。
"Means for Solving the Problems" In order to achieve the above object, the present invention has a structure in which the inside of a cylindrical concrete block having a cutting edge at the lower end is opened to the atmosphere when the block is propelled downward below the groundwater level. Under this condition, groundwater is taken into the block, the earth and sand in the center of the block is excavated without draining the groundwater, and pressurized air is ejected from the cutting edge. A method for constructing a manhole for an underground power transmission line, characterized in that the block is removed toward the center and the block is propelled downward by its own weight. Construction method The manhole construction method for an underground power transmission line is performed according to the first or second aspect of the invention, in which the underground water in the block is drained after completing the downward movement and filling the inner periphery of the cutting hole with foundation stones.

「作用」 従って地下水位3下に推進させた筒状コンクリートブロ
ック2の内部には外側の地下水4が刃口Iの下方から湧
出し、水面4′がほぼ地下水位3の水4町に上昇して溜
水する(第1図、第7図〜第8図)。その状態において
該地下水4を排除することなく内部の土砂5をバックホ
ー等の掘削機8で水中から地上9に除去すると第1図及
び第7図に示すように中央部に四部が形成される。その
状態において刃口lの下向圧気噴出口6から圧気を噴出
させ、その圧力によって刃口lの直下及び刃口1の内周
にある土砂5を上記の凹部に向って排除することができ
る(その状態を第8図に示す)。
``Function'' Therefore, inside the cylindrical concrete block 2 that has been pushed below the groundwater level 3, the groundwater 4 on the outside gushes out from below the cutout I, and the water surface 4' rises to approximately the water level 4 below the groundwater level 3. (Fig. 1, Fig. 7 to Fig. 8). In this state, if the earth and sand 5 inside is removed from the water to the ground 9 by an excavator 8 such as a backhoe without removing the groundwater 4, four parts are formed in the center as shown in FIGS. 1 and 7. In this state, pressurized air is ejected from the downward pressurized air outlet 6 of the cutting edge l, and by this pressure, the earth and sand 5 located directly below the cutting edge l and on the inner periphery of the cutting edge 1 can be removed toward the above-mentioned recess. (The state is shown in FIG. 8).

このようにすると刃口lの直下に空間Sが形成されるか
ら上記ブロック2は自重によって下降し空間Sの部分だ
け下方に推進する。この動作を繰返し又は該動作をmM
的に行うことによって上記ブロック2を所定深さまで推
進させることができる。その後第9図に示すように基礎
石7を投入して刃口lの内周部にこれを充填することに
よって刃口lの内周部の地下水圧を支持することができ
る(第9図参照)、その状態において上記ブロック2内
の地下水4を排水すると地下水圧は上記基礎石7の重量
と均衡し又は基礎石7の重量が勝って上記ボイリング現
象は阻止される。この状態において止水して上記ブロッ
ク2の底部が形成される。
In this way, a space S is formed directly below the cutting edge l, so that the block 2 descends by its own weight and is propelled downward by the space S. Repeat this operation or repeat this operation at mM
By doing so, the block 2 can be propelled to a predetermined depth. Thereafter, as shown in Fig. 9, the foundation stone 7 is thrown in and filled into the inner circumference of the cutting edge l, thereby supporting the groundwater pressure at the inner circumference of the cutting edge l (see Fig. 9). ), in this state, when the groundwater 4 in the block 2 is drained, the groundwater pressure balances with the weight of the foundation stone 7, or the weight of the foundation stone 7 overcomes, and the boiling phenomenon is prevented. In this state, water is stopped and the bottom of the block 2 is formed.

「実施例」 長方形の縦向筒状コンクリートブロック2の下端外周に
フリクシランカット10を形成し、下端内周に刃面l′
を有する刃口lを形成する。刃面1′の上端にはコンク
リート底板1)の支持段12を形成し、該支持段12の
直上内周面に上記底板llの側面に対面するコンクリー
ト係合溝13を形成し該側面にも該係合溝13と対向す
るコンクリート係合溝13’を形成する。刃面1′の下
端には刃口lの底面l#が形成され、該底面1“には横
向圧気管14を埋設し、該圧気管14には一定間隔毎に
圧気噴出口6を穿設し底面1″に開口させる。上記ブロ
ック2の側壁には縦向圧気管14’を複数個埋設し下端
を横向圧気管14に連通させる。そして上端は側壁の上
端面から突出させ圧縮空気管15、開閉弁16を介して
空気圧搾機17に接続する。このようにしだ上記ブロッ
ク2を地面9に載置しく第6図)、刃口lの直下及びブ
ロック2内部の土砂5を除くことによって該ブロック2
を自重下降させながら地中に推進すると地下水位3に達
する。そしてさらに推進させると地下水4が該ブロック
2内に湧水して溜水し、水面4′がほぼ地下水位3に達
して均衡する。この溜水内に小形バックホーなどの掘削
パケット8を挿入し刃口1の内周中央部の土砂5を掘削
し地面9に排除することによって該中央部には刃口lの
底面1″の水準より低い凹部が形成される(第1図仮想
線、第7図実線)。この状態において開閉弁16を開い
て圧気を噴出口6より下向に噴出させると、その圧力に
よって刃口lの直下及び内周部の土砂5が上記凹部に向
って押されて排除され刃口1の底面1“の下方に空r’
t sを生じるから上記ブロック2は自重によって下降
し空間Sの深さだけ下方に推進する。この動作は繰返し
行うが圧気噴出を連続的に行い、その状態で土砂5の掘
削を行うことによって上記の推進動作を継続的に行うこ
とができる。
"Example" A frixillan cut 10 is formed on the outer periphery of the lower end of a rectangular vertical cylindrical concrete block 2, and a cutting surface l' is formed on the inner periphery of the lower end.
A cutting edge l is formed. A support step 12 for the concrete bottom plate 1) is formed at the upper end of the blade surface 1', and a concrete engagement groove 13 facing the side surface of the bottom plate 11 is formed on the inner circumferential surface directly above the support step 12. A concrete engagement groove 13' facing the engagement groove 13 is formed. A bottom surface l# of the blade l is formed at the lower end of the blade surface 1', and a horizontal pressure trachea 14 is buried in the bottom surface 1'', and pressure air jet ports 6 are bored in the pressure trachea 14 at regular intervals. Open the bottom 1". A plurality of vertical pressure trachea 14' are embedded in the side wall of the block 2, and the lower ends thereof are communicated with the horizontal pressure trachea 14. The upper end projects from the upper end surface of the side wall and is connected to an air compressor 17 via a compressed air pipe 15 and an on-off valve 16. In this way, the block 2 is placed on the ground 9 (Fig. 6), and the block 2 is removed by removing the earth and sand 5 directly below the cutting edge l and inside the block 2.
When propelled into the ground while descending under its own weight, it reaches groundwater level 3. When the block 2 is further propelled, groundwater 4 springs and accumulates in the block 2, and the water surface 4' reaches approximately the groundwater level 3 and becomes balanced. An excavation packet 8 such as a small backhoe is inserted into this accumulated water, and the earth and sand 5 at the center of the inner periphery of the cutting edge 1 is excavated and disposed of on the ground 9. A lower recess is formed (phantom line in Figure 1, solid line in Figure 7).In this state, when the on-off valve 16 is opened and pressurized air is jetted downward from the jet nozzle 6, the pressure causes the air to flow directly below the blade l. The dirt 5 on the inner circumference is pushed toward the recess and removed, leaving an empty space r' below the bottom surface 1'' of the cutting edge 1.
Since t s is generated, the block 2 descends by its own weight and is propelled downward by the depth of the space S. Although this operation is repeated, the above-mentioned propulsion operation can be performed continuously by continuously ejecting pressurized air and excavating the earth and sand 5 in this state.

そして所定深さに推進した後栗石などの基礎石7を投入
して第9図に示すように刃口lの内周に充填して敷詰め
ることによって上記ブロック2の外側の地下水圧を支持
することができる。その状態で溜った地下水4をポンプ
で排除しコンクリート底板1)を支持段12及び基礎石
7上に支持し、上記係合溝13.13′間にコンクリー
ト18を充填することによって底板1)をその位置に固
定しかつ止水することができ該ブロック2の底部を形成
する。その後該ブロック2の上端開口部を着根19で閉
鎖し、該![19に形成されている出入口20.20に
出入筒21.21を支持し、該出入筒21.21を開閉
M22.22で閉鎖して第12図に示すように土砂を埋
戻して工事を終了するものである。
Then, after driving to a predetermined depth, a foundation stone 7 such as chestnut stone is thrown in, and as shown in FIG. be able to. In this state, the accumulated groundwater 4 is removed by a pump, the concrete bottom plate 1) is supported on the support stage 12 and the foundation stone 7, and the bottom plate 1) is filled with concrete 18 between the engagement grooves 13 and 13'. It forms the bottom of the block 2, which can be fixed in position and watertight. After that, the upper end opening of the block 2 is closed with the root 19, and the! [Support the inlet/outlet tube 21.21 at the entrance/exit 20.20 formed in 19, close the inlet/outlet tube 21.21 with M22.22, and backfill with earth and sand as shown in Fig. 12 to carry out the construction work. It ends.

「発明の効果」 本発明は上述の方法によったので地下送電線用マンホー
ルを地下水位3下に施工するに際し、刃口1の下方から
の5里出水事故(ボイリング現象)が無く、そのため作
業を中断する必要がないし人力を要せず迅速に筒状コン
クリートブロック2を所定深さに推進することができる
"Effects of the Invention" Since the present invention is based on the method described above, when constructing a manhole for an underground power transmission line below the groundwater level, there is no accident (boiling phenomenon) of water coming out from below the cutting edge 1, and therefore the work is carried out smoothly. It is not necessary to interrupt the process, and the cylindrical concrete block 2 can be quickly propelled to a predetermined depth without requiring human power.

父上記効果の他に5所定深さに推進した一F記ツブロッ
ク2底部を安全迅速に形成し得る効果がある。
In addition to the above-mentioned effects, there is an effect of safely and quickly forming the bottom part of the block 2 of the block 2, which is propelled to a predetermined depth.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明の地下送電線用マンホール及びその施工
法を示す切欠正面図、第2図は上記マンホールの切欠斜
視図、第3図は刃口推進状態図、第4図は第3図A−A
線による底面図、第5図はコンクリート係合溝の縦断面
図、第6図は筒状コンクリートブロックを地面に裁置し
た状態の正面図、第7図は地下水位下推進状態の正面図
、第8図は刃口直下及び内周の土砂排除状態の正面図、
第9図は基礎石充填状態の正面図、第10図は底部形成
状態の正面図、第1.1図は出入筒載置状態の正面図、
第12図は土砂埋戻状態の正面図である。 l・・刃口、2・・筒状コンクリートブロック、3・・
地下水位、4・・地下水、5・・土砂、6・・下向圧気
噴出口、7・・基礎石。
Fig. 1 is a cutaway front view showing the manhole for underground power transmission lines and its construction method according to the present invention, Fig. 2 is a cutaway perspective view of the above manhole, Fig. 3 is a diagram of the blade opening state, and Fig. 4 is Fig. 3. A-A
Fig. 5 is a vertical sectional view of the concrete engagement groove, Fig. 6 is a front view of the cylindrical concrete block placed on the ground, Fig. 7 is a front view of the state of propulsion below the groundwater level, Figure 8 is a front view of the state of removing dirt from the area directly below the cutting edge and the inner periphery.
Fig. 9 is a front view of the foundation stone filling state, Fig. 10 is a front view of the bottom forming state, Fig. 1.1 is a front view of the loading/unloading cylinder mounted state,
FIG. 12 is a front view of the backfilling state. l...Blade mouth, 2...Tubular concrete block, 3...
Groundwater level, 4. Groundwater, 5. Sediment, 6. Downward pressure air outlet, 7. Foundation stone.

Claims (3)

【特許請求の範囲】[Claims] (1)下端に刃口を設けた筒状コンクリートブロックを
地下水位下に下向に推進するに際し、該ブロック内を大
気に開放した状態において地下水を該ブロック内に取込
み、該地下水を排水することなく該ブロック内の中央部
の土砂を掘削し、刃口から圧気を噴出させることにより
該圧気によって刃口直下及び刃口内周の土砂を中央部に
向って排除し、上記ブロックを自重によって下降推進さ
せることを特徴とする地下送電線用マンホール施工法。
(1) When a cylindrical concrete block with a cutting edge at the lower end is propelled downward below the groundwater level, groundwater is taken into the block and drained while the block is open to the atmosphere. The earth and sand in the center of the block is excavated without any problem, and the pressurized air is ejected from the cutting edge, which removes the earth and sand directly below the cutting edge and around the inner periphery of the cutting edge toward the center, and the block is propelled downward by its own weight. A method of constructing manholes for underground power transmission lines.
(2)刃口に複数の下向圧気噴出口を有する請求項(1
)記載の地下送電線用マンホール施工法。
(2) Claim (1) in which the cutting edge has a plurality of downward pressure air outlets
) Manhole construction method for underground power transmission lines.
(3)下降推進を終了し、上記刃口の内周に基礎石を充
填した後上記ブロック内の地下水を排水する請求項(1
)又は(2)記載の地下送電線用マンホール施工法。
(3) Claim (1) in which the underground water in the block is drained after finishing the downward propulsion and filling the inner periphery of the cutting edge with foundation stones.
) or the underground power transmission line manhole construction method described in (2).
JP1115895A 1989-05-08 1989-05-08 Construction of manhole for underground power transmission line Pending JPH02296930A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1115895A JPH02296930A (en) 1989-05-08 1989-05-08 Construction of manhole for underground power transmission line

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1115895A JPH02296930A (en) 1989-05-08 1989-05-08 Construction of manhole for underground power transmission line

Publications (1)

Publication Number Publication Date
JPH02296930A true JPH02296930A (en) 1990-12-07

Family

ID=14673858

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1115895A Pending JPH02296930A (en) 1989-05-08 1989-05-08 Construction of manhole for underground power transmission line

Country Status (1)

Country Link
JP (1) JPH02296930A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5423723A (en) * 1977-07-15 1979-02-22 Toray Ind Inc Water absorbing acrylic fibers, mixed, union knitted and woven fabric pproducts compresing them
JPS54118608A (en) * 1978-03-06 1979-09-14 Sato Katsuaki Burying and installing method of circular concrete water tank

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5423723A (en) * 1977-07-15 1979-02-22 Toray Ind Inc Water absorbing acrylic fibers, mixed, union knitted and woven fabric pproducts compresing them
JPS54118608A (en) * 1978-03-06 1979-09-14 Sato Katsuaki Burying and installing method of circular concrete water tank

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