JP3386941B2 - Jack device for underground loading test on foundation pile - Google Patents
Jack device for underground loading test on foundation pileInfo
- Publication number
- JP3386941B2 JP3386941B2 JP24373095A JP24373095A JP3386941B2 JP 3386941 B2 JP3386941 B2 JP 3386941B2 JP 24373095 A JP24373095 A JP 24373095A JP 24373095 A JP24373095 A JP 24373095A JP 3386941 B2 JP3386941 B2 JP 3386941B2
- Authority
- JP
- Japan
- Prior art keywords
- pile
- jack
- flange
- pressure plate
- test
- 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 - Fee Related
Links
- 239000007788 liquid Substances 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 15
- 239000003673 groundwater Substances 0.000 claims description 9
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
- 239000011800 void material Substances 0.000 description 9
- 238000006073 displacement reaction Methods 0.000 description 5
- 239000004570 mortar (masonry) Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000005553 drilling Methods 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000008267 milk Substances 0.000 description 2
- 210000004080 milk Anatomy 0.000 description 2
- 235000013336 milk Nutrition 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Force Measurement Appropriate To Specific Purposes (AREA)
Description
【発明の詳細な説明】Detailed Description of the Invention
【０００１】[0001]
【発明の属する技術分野】この発明は、基礎杭における
地中載荷試験用ジャッキ装置に関する。さらに詳細に
は、試験杭の先端部にジャッキを取付けて地中載荷によ
る試験を行った後、その試験杭を本杭として利用する場
合のジャッキ装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jack device for underground loading test on a foundation pile. More specifically, when a jack is attached to the tip of the test pile and a test is performed by loading underground, the test pile is used as a main pile.
The present invention relates to a jack device.
【０００２】[0002]
【従来の技術】一般に、杭の載荷試験はジャッキを地上
に設置し、杭頭に荷重を加えることにより行われてい
る。この地上載荷による試験方法は、反力杭、梁等の大
がかりな設備を必要とする。このため、杭の先端あるい
は中間部にジャッキを取付け、地中で載荷することによ
り、先端支持力、杭周摩擦力、変位等を測定する簡易な
試験方法が提案されている（例えば特公平６−５８２７
０号公報）。この地中載荷による試験方法は、既製杭及
び場所打ち杭いずれにも適用できる。2. Description of the Related Art Generally, a pile loading test is carried out by installing a jack on the ground and applying a load to the pile head. This ground loading test method requires large-scale equipment such as reaction force piles and beams. For this reason, a simple test method has been proposed in which a jack is attached to the tip or the middle portion of the pile and the tip supporting force, the peripheral frictional force of the pile, and the displacement are measured by loading the pile in the ground (for example, Japanese Patent Publication No. -5827
No. 0). This underground loading test method can be applied to both ready-made piles and cast-in-place piles.
【０００３】地中載荷による載荷試験に用いた試験杭を
本杭として利用する試みもなされている。この場合、試
験時のジャッキの伸長作動のために供給された、圧油等
の作動液体をシリンダ内に封入したままでは所要の支持
力が期待できないので、作動液体を排出し、セメントミ
ルク等の液状硬化材と置換する処理がなされている。Attempts have also been made to utilize the test pile used for the loading test by underground loading as the main pile. In this case, the required supporting force cannot be expected with the working fluid such as pressure oil, which is supplied for the extension operation of the jack during the test, sealed in the cylinder. A process of replacing with a liquid hardening material is performed.
【０００４】ところで、地中載荷による載荷試験におい
ては、ジャッキの伸長作動によりジャッキよりも上方の
杭体には上向きの力が加えられ、またジャッキよりも下
方の支持地盤を含む杭体には下向きの力が加えられる。
その結果、杭周摩擦力の大きさ、地盤の支持力により杭
体の変位形態は異なるが、いずれにしてもジャッキの作
動による杭体の変位によりジャッキ周囲の地盤には空隙
が生じることになる。この空隙には経時的に周辺土壌が
崩壊して充填され、その移動に伴って杭先端地盤が乱さ
れ、先端支持力が低下する恐れがある。場合によって
は、杭が沈下することも考えられる。By the way, in the load test by underground loading, upward force is applied to the pile body above the jack due to the extension operation of the jack, and downward force is applied to the pile body including the supporting ground below the jack. The power of is added.
As a result, the form of displacement of the pile differs depending on the magnitude of the frictional force around the pile and the supporting force of the ground, but in any case, the displacement of the pile due to the operation of the jack creates a void in the ground around the jack. . The surrounding soil collapses and fills this void with time, and the soil at the tip of the pile is disturbed as the soil moves, and the bearing capacity of the tip may decrease. In some cases, piles may sink.
【０００５】[0005]
【発明が解決しようとする課題】この発明は上記のよう
な技術的背景に着目してなされたものであって、次の目
的を達成するものである。The present invention has been made in view of the above technical background, and achieves the following objects.
【０００６】この発明の目的は、試験時にジャッキ周囲
の地盤に生じる空隙の処理を確実に施すことにより、所
要の支持力が得られ試験杭を本杭として利用することが
できる、基礎杭における地中載荷試験用ジャッキ装置を
提供することを目的とする。An object of the present invention is to reliably treat voids generated in the ground around the jack during a test so that a required supporting force can be obtained and the test pile can be used as a main pile. An object is to provide a jack device for medium load test.
【０００７】[0007]
【課題を解決するための手段】この発明は上記課題を達
成するために、次のような手段を採る。The present invention adopts the following means in order to achieve the above object.
【０００８】[0008]
【０００９】[0009]
【００１０】[0010]
【００１１】すなわちこの発明は、ピストンとシリンダ
とからなり、基礎杭における地中載荷試験に使用される
ジャッキであって、前記ピストンの先端には杭径とほぼ
同径の加圧板が設けられており、前記シリンダの開口部
外周には前記加圧板とほぼ同径のフランジが形成されて
おり、前記フランジに該フランジと前記加圧板との間に
液状硬化材を注入するための注入パイプが設けられてい
ることを特徴とするジャッキ装置にある。[0011] Namely the present invention, Ri Do from the piston and the cylinder, a jack that is used in the ground loading tests in foundation pile, substantially pressure plate having the same diameter are provided and pile diameter at the distal end of the piston In addition, a flange having substantially the same diameter as the pressure plate is formed on the outer periphery of the opening of the cylinder, and an injection pipe for injecting a liquid hardening material is formed in the flange between the flange and the pressure plate. The jack device is characterized by being provided.
【００１２】さらにこの発明は、前記フランジに該フラ
ンジと前記加圧板との間に流入した地下水等を排出する
ための排出パイプが設けられていることを特徴とするジ
ャッキ装置にある。Further, the present invention is the jack device, characterized in that the flange is provided with a discharge pipe for discharging the groundwater and the like flowing in between the flange and the pressure plate.
【００１３】この発明によれば、ジャッキの作動により
その周囲の地盤に形成された空隙に液状硬化材が注入さ
れる。このため、空隙は液状硬化材で充填されて消失
し、杭体が完全に一体化して所要の支持力を発揮するこ
とが可能となる。液状硬化材としてはセメントミルク等
の周知の材料を用いることができる。地下水位が高い場
合、空隙には地下水が流入するので、この地下水を排出
して、空隙に液状硬化材を注入するのが好ましい。According to the present invention, the liquid hardening material is injected into the void formed in the ground around it by the operation of the jack. Therefore, the voids are filled with the liquid hardening material and disappear, so that the pile body can be completely integrated and a required supporting force can be exerted. A well-known material such as cement milk can be used as the liquid hardening material. When the groundwater level is high, groundwater flows into the void, so it is preferable to drain this groundwater and inject the liquid hardening material into the void.
【００１４】載荷試験に用いられるジャッキは、杭径よ
りも小径のものを使用可能とするために、ピストンに杭
径とほぼ同径の加圧板が設けられ、シリンダに加圧板と
ほぼ同径のフランジが形成されている。液状硬化材の注
入パイプをフランジに設けることにより、注入を容易に
行える。The jack used for the load test has a pressure plate having a diameter substantially the same as the diameter of the pile and the cylinder has a pressure plate having a diameter substantially the same as that of the pile so that the diameter of the jack can be smaller than the diameter of the pile. A flange is formed. By providing the liquid hardening material injection pipe on the flange, injection can be easily performed.
【００１５】[0015]
【発明の実施の形態】この発明の実施の形態を図面を用
いて以下に説明する。図１、図２はこの発明の実施の形
態を示す断面図であり、図１はジャッキの作動前の状態
を示し、図２はジャッキの作動後の状態を示している。
図３は図１のＡ−Ａ線断面図である。この実施の形態
は、リバースサーキュレーションドリル工法、アースド
リル工法、ベノト工法等により施工される場所打ち杭の
載荷試験を行い、その後処理を行って本杭として用いる
例である。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are sectional views showing an embodiment of the present invention. FIG. 1 shows a state before the operation of the jack, and FIG. 2 shows a state after the operation of the jack.
FIG. 3 is a sectional view taken along the line AA of FIG. This embodiment is an example in which a load test of a cast-in-place pile constructed by a reverse circulation drilling method, an earth drilling method, a benot method or the like is performed, and after that, it is used as a main pile.
【００１６】場所打ち杭１は、通常次のようにして施工
される。すなわち、地下水の逸出を防止しながら、専用
の掘削機により掘削孔２を形成した後、孔底に水中モル
タル３を打設する。次に多数の縦筋４及びフープ筋（図
示せず）からなる鉄筋籠５を掘削孔２に建込み、さらに
コンクリート６を打設する。The cast-in-place pile 1 is usually constructed as follows. That is, the excavator 2 is formed by a dedicated excavator while preventing escape of groundwater, and then the underwater mortar 3 is placed at the bottom of the hole. Next, a reinforcing bar cage 5 composed of a large number of vertical bars 4 and hoop bars (not shown) is built in the excavation hole 2 and concrete 6 is poured.
【００１７】場所打ち杭１の載荷試験は、水中モルタル
３及びコンクリート６の硬化後に行われるが、そのため
の装置として鉄筋籠５の先端に油圧ジャッキ等の液圧ジ
ャッキ７が溶接等により固着されている。ジャッキ７は
鉄筋籠５の建込みに伴い、水中モルタル３内に設置され
る。The load test of the cast-in-place pile 1 is carried out after the underwater mortar 3 and the concrete 6 are hardened. As a device therefor, a hydraulic jack 7 such as a hydraulic jack is fixed to the tip of the rebar cage 5 by welding or the like. There is. The jack 7 is installed in the underwater mortar 3 as the rebar cage 5 is built.
【００１８】ジャッキ７はシリンダ８とその内部に摺動
自在に設けられたピストン９とを有し、ピストン９の先
端には杭径とほぼ同径の加圧板１１が設けられている。
また、シリンダ８の開口部外周には加圧板１１とほぼ同
径のフランジ１０が形成されている。このフランジ１０
はジャッキ７の作動時に、反力により杭１が上方に変位
する際、杭１の下端部が摩擦により欠損するのを防止す
るためのものである。このようにピストン９には加圧板
１１、シリンダ８にはフランジ１０を設けるので、杭径
よりも小径のジャッキを使用することができ、これによ
り適宜種類の径のジャッキを用意しておけば、あらゆる
径の杭に対応可能となる。The jack 7 has a cylinder 8 and a piston 9 slidably provided therein, and a tip end of the piston 9 is provided with a pressure plate 11 having a diameter substantially equal to the pile diameter.
Further, a flange 10 having substantially the same diameter as the pressure plate 11 is formed on the outer circumference of the opening of the cylinder 8. This flange 10
Is for preventing the lower end of the pile 1 from being damaged by friction when the pile 1 is displaced upward due to a reaction force when the jack 7 is operated. Since the pressure plate 11 is provided on the piston 9 and the flange 10 is provided on the cylinder 8 as described above, a jack having a diameter smaller than the pile diameter can be used, and if a jack of an appropriate type is prepared, It can be used for piles of all diameters.
【００１９】液状硬化材の注入パイプ１２及び地下水等
の排出パイプ１３の各先端がフランジ１０に固定され、
パイプ１２、１３の先端はフランジ１０と加圧板１１と
の間に開口している。パイプ１２、１３は全体に環状に
なるようにそれぞれ複数本（図示の例では２本ずつ）設
けられているが、少なくとも１本ずつあればよい。パイ
プ１２、１３は専用のものを設けてもよいが、載荷試験
時の変位測定用のパイプを利用することもできる。この
場合、先端沈下測定用のロッド１８がパイプ１２、１３
の一方に挿通され、そのロッドの先端が加圧板１１に固
定される。圧油等の作動液体の供給パイプ１４及びその
排出パイプ１５がシリンダ８に設けられている。The respective ends of the liquid hardening material injection pipe 12 and the ground water discharge pipe 13 are fixed to the flange 10.
The ends of the pipes 12 and 13 are open between the flange 10 and the pressure plate 11. Each of the pipes 12 and 13 is provided with a plurality of pipes (two pipes in the illustrated example) so that the pipes 12 and 13 have an annular shape as a whole. Although the dedicated pipes 12 and 13 may be provided, it is also possible to use pipes for displacement measurement during a load test. In this case, the rod 18 for measuring the tip squat is attached to the pipes 12, 13
One end of the rod is fixed to the pressure plate 11. The cylinder 8 is provided with a supply pipe 14 and a discharge pipe 15 for the working liquid such as pressure oil.
【００２０】場所打ち杭１の載荷試験は、供給パイプ１
４を介して作動液体をシリンダ８に供給し（図１矢印参
照）、ジャッキ７を杭軸方向に伸長作動させることによ
り行われ、支持力、変位等が測定される。このジャッキ
の作動によりフランジ１０と加圧板１１との間で硬化し
たモルタル３が切れ、両者１０、１１間に空隙Ｖが生じ
る（図２参照）。また、この空隙Ｖには地下水等が流入
する。The load test of the cast-in-place pile 1 is carried out by the supply pipe 1.
The working liquid is supplied to the cylinder 8 through the nozzle 4 (see the arrow in FIG. 1), and the jack 7 is extended in the axial direction of the pile, and the supporting force, the displacement and the like are measured. By the operation of this jack, the hardened mortar 3 is broken between the flange 10 and the pressure plate 11, and a void V is formed between the two (see FIG. 2). Further, groundwater or the like flows into this void V.
【００２１】この発明はこの空隙Ｖに液状硬化材を注入
するものである。具体的には、排出パイプ１３を介して
地下水等を排出し、注入パイプ１２を介して空隙Ｖにセ
メントミルク等の液状硬化材１６を注入、充填する。ま
た、従来と同様に、排出パイプ１５を介してシリンダ８
内の作動液体を排出し、前記と同様の液状硬化材１７を
注入する。以上により、硬化材１６、１７を介して、杭
体が完全に一体化し所要の支持力を期待することがで
き、本杭として利用することが可能となる。The present invention is to inject a liquid hardening material into the void V. Specifically, groundwater or the like is discharged through the discharge pipe 13, and the liquid hardening material 16 such as cement milk is injected and filled into the void V through the injection pipe 12. Further, as in the conventional case, the cylinder 8 is connected via the discharge pipe 15.
The working liquid inside is discharged, and the liquid hardening material 17 similar to the above is injected. As described above, the pile bodies can be completely integrated through the hardened materials 16 and 17, and a required supporting force can be expected, and the pile body can be used as the main pile.
【００２２】上記実施の形態では、ジャッキ７はシリン
ダ８が上側、ピストン９が下側となるように配置されて
いるが、それらの上下が逆になるように配置してもよ
い。この発明は、試験杭が前記のような場所打ち杭に限
らず、深礎杭、既製杭である場合にも適用できる。ま
た、載荷位置が杭の先端である場合に限らず、中間部で
ある場合にも、この発明を適用できる。In the above embodiment, the jack 7 is arranged so that the cylinder 8 is on the upper side and the piston 9 is on the lower side, but they may be arranged so that they are upside down. The present invention is applicable not only to the above-mentioned cast-in-place piles but also to deep foundation piles and ready-made piles. Further, the present invention is applicable not only when the loading position is at the tip of the pile but also when it is at the middle portion.
【００２３】[0023]
【発明の効果】以上のようにこの発明によれば、試験時
にジャッキ周囲の地盤に生じる空隙に液状硬化材を注入
し、空隙の処理を確実に施すので、試験杭を本杭に利用
するにあたり所要の支持力を期待することができる。ま
た、ジャッキは杭径よりも小径のものを用いることが可
能なので、その種類が少なくてよく、コストの低減を図
ることができる。As described above, according to the present invention, the liquid hardening material is injected into the voids formed in the ground around the jack at the time of the test, and the voids are surely treated. You can expect the required support. Further, since the jack having a diameter smaller than the pile diameter can be used, the number of types can be small, and the cost can be reduced.
【図１】図１はこの発明の実施の形態を示す断面図であ
って、ジャッキの作動前の状態を示す図である。FIG. 1 is a cross-sectional view showing an embodiment of the present invention, showing a state before the operation of a jack.
【図２】図２はジャッキの作動後の状態を示す断面図で
ある。FIG. 2 is a cross-sectional view showing a state after the operation of the jack.
【図３】図３は図１のＡ−Ａ線断面図である。3 is a sectional view taken along the line AA of FIG.
１…場所打ち杭 ２…掘削孔 ３…水中モルタル ５…鉄筋籠 ７…ジャッキ ８…シリンダ ９…ピストン １０…フランジ １１…加圧板 １２…注入パイプ １３…排出パイプ 1 ... cast-in-place 2 ... Drilling hole 3 ... Underwater mortar 5 ... Rebar cage 7 ... Jack 8 ... Cylinder 9 ... Piston 10 ... Flange 11 ... Pressure plate 12 ... Injection pipe 13 ... Discharge pipe
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) G01L 5/00 E02D 33/00 ─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. 7 , DB name) G01L 5/00 E02D 33/00
Claims (2)
おける地中載荷試験に使用されるジャッキであって、 前記ピストンの先端には杭径とほぼ同径の加圧板が設け
られており、 前記シリンダの開口部外周には前記加圧板とほぼ同径の
フランジが形成されており、 前記フランジに該フランジと前記加圧板との間に液状硬
化材を注入するための注入パイプが設けられていること
を特徴とするジャッキ装置。1. A Ri Do and a piston and cylinder, the foundation pile
A definitive underground loading test Ru is used for the jack, the the tip of the piston is substantially pressure plate having the same diameter are provided and pile diameter, the opening periphery of said cylinder substantially and the pressure plate the same diameter Is formed, and an injection pipe for injecting a liquid hardening material is provided between the flange and the pressure plate on the flange.
の間に流入した地下水等を排出するための排出パイプが
設けられていることを特徴とする請求項１記載のジャッ
キ装置。2. The jack device according to claim 1, wherein the flange is provided with a drain pipe for draining groundwater and the like flowing between the flange and the pressure plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24373095A JP3386941B2 (en) | 1995-08-29 | 1995-08-29 | Jack device for underground loading test on foundation pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24373095A JP3386941B2 (en) | 1995-08-29 | 1995-08-29 | Jack device for underground loading test on foundation pile |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0961267A JPH0961267A (en) | 1997-03-07 |
| JP3386941B2 true JP3386941B2 (en) | 2003-03-17 |
Family
ID=17108145
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24373095A Expired - Fee Related JP3386941B2 (en) | 1995-08-29 | 1995-08-29 | Jack device for underground loading test on foundation pile |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3386941B2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100588761B1 (en) * | 2005-03-25 | 2006-06-09 | (주)지 텍크 | Bearing Capacity Measurement Method and Measurement Method for Reinforced Concrete Piles with Large Diameter by Two-way Hydraulic Loading Device Using High Pressure Loading System |
| CN103015466B (en) * | 2012-12-24 | 2014-08-06 | 太原理工大学 | Device for testing liquefying effect of pile foundation indoors and liquefying effect evaluation method |
| CN104775457A (en) * | 2015-04-24 | 2015-07-15 | 广东天信电力工程检测有限公司 | Base pile pulling-resistant test device |
| KR102131904B1 (en) * | 2018-01-26 | 2020-07-08 | 김대학 | Bearing capacity measuring device |
| CN110387912A (en) * | 2019-08-15 | 2019-10-29 | 南昌永祺科技发展有限公司 | A kind of collection test force reinforces integrated load box with engineering pile |
| CN111364529B (en) * | 2020-04-29 | 2025-02-14 | 江西鸿利精密制造有限公司 | A load box using a self-service in-cylinder grouting jack |
| KR102803678B1 (en) * | 2024-01-04 | 2025-05-12 | 주식회사 케이씨티엔지니어링 | Bidirectional load test device |
-
1995
- 1995-08-29 JP JP24373095A patent/JP3386941B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0961267A (en) | 1997-03-07 |
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