JPH07316532A - Production of static crushing agent - Google Patents
Production of static crushing agentInfo
- Publication number
- JPH07316532A JPH07316532A JP14360295A JP14360295A JPH07316532A JP H07316532 A JPH07316532 A JP H07316532A JP 14360295 A JP14360295 A JP 14360295A JP 14360295 A JP14360295 A JP 14360295A JP H07316532 A JPH07316532 A JP H07316532A
- Authority
- JP
- Japan
- Prior art keywords
- crushing agent
- static crushing
- granules
- particle size
- static
- 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.)
- Granted
Links
Landscapes
- Piles And Underground Anchors (AREA)
- Working Measures On Existing Buildindgs (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は場所打杭の杭頭処理に用
いられる静的破砕剤の製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a static crushing agent used for treating pile heads of cast-in-place piles.
【0002】[0002]
【従来の技術】一般に、ビルや橋などを建造する場合の
基礎杭として、現場において地中に杭孔を掘削し、この
杭孔内に生コンクリートを打設して杭を形成する、いわ
ゆる場所打杭が採用されている。この場所打杭の場合、
杭頭余盛部分の不良コンクリートを破砕除去する必要性
がある。しかし、従来から行われていたブレーカ等を使
用して破砕する方法では、近隣に与える騒音や振動等が
環境を悪化する原因となり問題となる。2. Description of the Related Art Generally, as a foundation pile for building a building or a bridge, a so-called place where a pile hole is excavated in the ground at the site and a concrete is placed in the pile hole to form a pile. The pile driving is adopted. In the case of this place driving,
It is necessary to crush and remove the bad concrete in the pile head surplus area. However, the conventional method of crushing using a breaker or the like causes problems such as noise and vibration given to the neighborhood causing deterioration of the environment.
【0003】そこで、このような問題を解決する工法と
して、本件出願人は静的破砕剤を用いた杭頭処理工法を
既に提案してある(特願昭57−201048号)。こ
の杭頭処理工法は、例えば、掘削した杭孔内に空のスパ
イラルシース管を取付けた鉄筋篭を沈設し、コンクリー
ト打設前にスパイラルシース管内に水で混練した静的破
砕剤を充填し、コンクリートの養生と共に静的破砕剤の
水和膨張を図り、コンクリート杭の切断計画線上に亀裂
を発生させて余盛部分の不良コンクリートを除去するも
のであった。Therefore, as a construction method for solving such a problem, the applicant of the present application has already proposed a pile head treatment method using a static crushing agent (Japanese Patent Application No. 57-201048). This pile head treatment method is, for example, to lay a reinforced basket with an empty spiral sheath pipe attached in the excavated pile hole, and to fill the spiral sheath pipe with a static crushing agent kneaded with water before placing concrete, Hydration expansion of the static crushing agent was attempted along with curing of concrete, and cracks were generated on the planned cutting line of concrete piles to remove defective concrete in the surplus portion.
【0004】しかしながら、上記従来の場所打杭の杭頭
処理工法にあっては、静的破砕剤に水を添加し、予め混
練してスラリー状態にしてからシース管に充填する使用
方法であったため、破砕効果は優れているものの、静的
破砕剤の混練水の計量、混練作業および混練してから膨
張圧発現時間の調整等、作業面での煩雑さを伴う。ま
た、静的破砕剤を用いて場所打杭の杭頭を処理した場
合、数mm程度の亀裂しか発生させることができず、杭
頭余盛部分の除去処理のためには不十分であって、後処
理に長時間が掛かる。However, in the above-mentioned conventional pile head treatment method for cast-in-place piles, water was added to the static crushing agent, which was kneaded in advance into a slurry state and then filled in the sheath tube. Although the crushing effect is excellent, it is complicated in terms of work such as measurement of kneading water of the static crushing agent, kneading work, and adjustment of expansion pressure developing time after kneading. In addition, when the pile heads of cast-in-place piles are treated with static crushing agents, only a few mm of cracks can be generated, which is not sufficient for removing the pile head surplus portion. , It takes a long time for post-processing.
【0005】[0005]
【発明が解決しようとする課題】上記従来の場所打杭の
杭頭処理工法に使用されている静的破砕剤では、その利
用にあたって煩わしい前作業を必要とし、また、亀裂幅
も数mm程度で杭頭余盛部分の除去処理のためには不十
分であるため、利用がより簡単で亀裂幅が大きい静的破
砕剤を製造することが望まれていた。However, the static crushing agent used in the conventional pile head treatment method for cast-in-place piles requires a troublesome pre-work, and the crack width is about several mm. Since it is insufficient for removing the pile pile surplus portion, it has been desired to produce a static crushing agent which is easier to use and has a larger crack width.
【0006】そこで、上記問題点を解決するための本発
明における技術的課題は、場所打ち作業における静的破
砕剤充填作業の煩雑さを回避させるとともに後処理を容
易にさせる静的破砕剤の製造方法を提供することにあ
る。[0006] Therefore, the technical problem in the present invention for solving the above problems is to manufacture a static crushing agent which avoids the complexity of the static crushing agent filling work in the place-casting work and facilitates the post-treatment. To provide a method.
【0007】[0007]
【課題を解決するための手段】本発明による静的破砕剤
の製造方法は、乾粉に形成した破砕剤をブリケッティン
グマシンにより高い圧力で連続的に強固なアーモンド状
のブリケットに造粒し、その後粉砕して、粒径1〜2m
mが15〜20重量%、粒径2〜4mmが55〜60重
量%、粒径4〜5mmが35〜20重量%の粒度分布を
有する顆粒に形成することを特徴とする。A method for producing a static crushing agent according to the present invention is a method in which a crushing agent formed into dry powder is continuously granulated into a strong almond-shaped briquette at a high pressure by a briquetting machine, After that, pulverize to a particle size of 1-2 m
m is 15 to 20% by weight, particle size 2 to 4 mm is 55 to 60% by weight, and particle size 4 to 5 mm is 35 to 20% by weight.
【0008】〔具体的構成〕本発明において使用される
静的破砕剤は、カルシウム・アルミノ・フェライト
〔(CaO)4 ・Al2 O3 ・Fe2 O3 〕と遊離酸化
カルシウム(CaO)および酸化マグネシウム(Mg
O)を基本成分とし、これに遅延剤としてホウ酸塩等を
添加したものである。そして、遅延剤の種類および添加
量を適宜変えることによって、水和膨張圧の発現時間を
調整することができる。[Specific Structure] The static crushing agent used in the present invention includes calcium alumino ferrite [(CaO) 4 .Al 2 O 3 .Fe 2 O 3 ], free calcium oxide (CaO) and oxidation. Magnesium (Mg
O) is a basic component, and borate or the like is added to this as a retarder. Then, the expression time of the hydration expansion pressure can be adjusted by appropriately changing the type and addition amount of the retarder.
【0009】静的破砕剤を顆粒状に成形するのは、各粒
子間に空隙を保つことによって、安定液が各粒子を十分
に包み込むことができるようにするためである。これに
より、静的破砕剤を充填した容器を安定液の中に単に漬
けただけでも、各顆粒が十分に水和し、膨張圧を発現す
る。また、静的破砕剤を顆粒状に成形する手段として
は、ブリケッティングマシンにより破砕剤の乾粉を高い
圧力で連続的に強固なアーモンド状のブリケットに造粒
する方法や、コンパクティングマシンにより破砕剤の乾
粉をスムースロールで板状に圧縮成形した後、破砕して
造粒する方法、その他の乾式圧縮成形方法が挙げられ
る。The reason why the static crushing agent is formed into a granule is to maintain a space between the particles so that the stabilizing solution can sufficiently wrap the particles. As a result, even if the container filled with the static crushing agent is simply immersed in the stabilizing solution, each granule is sufficiently hydrated and the expansion pressure is developed. The static crushing agent can be formed into granules by continuously granulating the dry powder of the crushing agent into a strong almond-shaped briquette with high pressure using a briquetting machine, or crushing with a compacting machine. Examples include a method in which dry powder of the agent is compression molded into a plate shape with a smooth roll, and then crushed and granulated, and other dry compression molding methods.
【0010】静的破砕剤の顆粒の大きさは、下記表−1
の粒度分布にする。The size of the granules of the static crushing agent is shown in Table 1 below.
The particle size distribution of
【0011】[0011]
【表1】 [Table 1]
【0012】容器内に充填された顆粒状の静的破砕剤が
吸水する方法は、容器自体を不浸透性の材料で形成し、
その両端開口部を顆粒が抜け落ちない程度のメッシュで
形成されたネット被覆し、該ネットを通して吸水するも
のである。静的破砕剤が吸水する安定液は、杭孔掘削時
に杭孔周壁の崩壊を防止する為に杭孔内に注入されるも
ので、例えば、ベントナイト溶液又はベントナイト溶液
にCMCや分散剤を添加したものなどが用いられる。The method in which the granular static crushing agent filled in the container absorbs water is that the container itself is formed of an impermeable material,
The openings at both ends are covered with a net formed of a mesh that does not allow the granules to fall out, and water is absorbed through the net. The stable liquid absorbed by the static crushing agent is injected into the pile hole to prevent collapse of the peripheral wall of the pile hole during excavation of the pile hole. For example, a bentonite solution or a bentonite solution added with CMC or a dispersant is used. Something is used.
【0013】静的破砕剤が杭孔内の安定液を吸水する手
段としては、安定液が杭孔内に十分に満たされている場
合には、鉄筋篭を杭孔内へ挿入した時に容器を安定液内
に沈漬して吸水させるか、若しくは安定液が十分に満た
されていない場合には、コンクリートの打設時に安定液
の水位上昇を図り、容器を安定液中に没して静的破砕剤
の吸水を行う。尚、静的破砕剤の最適水和条件は、安定
液に沈漬している時間等を調整することによって行うこ
とができる。As a means for the static crushing agent to absorb the stabilizing liquid in the pile hole, if the stabilizing liquid is sufficiently filled in the pile hole, the container should be inserted when the rebar cage is inserted into the pile hole. If it is submerged in the stabilizing liquid to absorb water, or if the stabilizing liquid is not sufficiently filled, try to raise the level of the stabilizing liquid when pouring concrete and immerse the container in the stabilizing liquid to make it static. Absorb the water of the crushing agent. The optimum hydration condition of the static crushing agent can be adjusted by adjusting the time of immersion in the stabilizing solution.
【0014】〔本発明の静的破砕剤を用いた杭頭処理工
法〕次に、本発明による静的破砕剤を用いた杭頭処理工
法の施行方法を図1に基づいて説明する。まず、安定液
の存在下で杭孔を掘削する。そして、主筋縁切材を鉄筋
篭主筋に取付ける(工程101)。次に、顆粒状の静的
破砕材を容器に充填し、この容器を鉄筋篭に取付け(工
程102)、静的破砕材入り容器を取付けた鉄筋篭を安
定液で満たされたた杭孔内に挿入して沈漬する。容器が
安定液に沈漬すると、安定液が容器の両端のネットから
容器内に侵入し、侵入した安定液が顆粒状の静的破砕材
を十分に包み込み、静的破砕材の外周から内部に吸水さ
れていく(工程103)。その後、コンクリートを安定
液と置換しながら破砕計画線上方まで打設する(工程1
04)。打設完了後、コンクリートの強度が発現するま
で養生する。また、それと同時に静的破砕材の水和膨張
を図る(工程105)。そして、コンクリートの養生終
了後、静的破砕剤の膨張圧発現を待って破砕計画線上に
亀裂を発生させ、余盛コンクリート部分を除去して杭頭
の処理を終了する(工程106)。[Pile head treatment method using the static crushing agent of the present invention] Next, a method of implementing the pile head treatment method using the static crushing agent of the present invention will be described with reference to FIG. First, a pile hole is excavated in the presence of a stabilizing liquid. Then, the main bar edging material is attached to the rebar cage main bar (step 101). Next, a granular static crushing material is filled into a container, this container is attached to a rebar cage (step 102), and the rebar cage with the container containing the static crushing material is placed in a pile hole filled with a stabilizing solution. Insert into and submerge. When the container is submerged in the stabilizing solution, the stabilizing solution penetrates into the container from the nets on both ends of the container. Water is absorbed (step 103). After that, while replacing the concrete with the stabilizing liquid, the concrete is placed above the crushing planning line (Step 1
04). After the completion of casting, the concrete is cured until the strength of the concrete appears. At the same time, hydration expansion of the statically crushed material is attempted (step 105). After the concrete is cured, the expansion pressure of the static crushing agent is awaited, a crack is generated on the crushing planning line, the surplus concrete portion is removed, and the pile head treatment is finished (step 106).
【0015】尚、上記本発明の処理工法を、図2に示す
従来工法と比較した場合、静的破砕剤の水の計量、破砕
剤との水の混練作業および、鉄筋篭へ予め取付けた容器
にスラリを充填する作業(工程107)を、本発明の場
合では省略することができることになる。When the treatment method of the present invention is compared with the conventional method shown in FIG. 2, the static crushing agent water is metered, the crushing agent water is kneaded, and the container preliminarily attached to the rebar cage. The operation of filling the slurry with the slurry (step 107) can be omitted in the case of the present invention.
【0016】[0016]
【作用】上記構成により、本発明による静的破砕剤の製
造方法においては、乾粉に形成した破砕剤をブリケッテ
ィングマシンにより高い圧力で連続的に強固なアーモン
ド状のブリケットに造粒し、その後粉砕して、所定の粒
度分布の顆粒に形成したことにより、基本成分と遅延剤
とが各顆粒において適度に配合され、吸水性および水和
反応性を良くし、水和膨張圧が大きい静的破砕剤を形成
させる。With the above structure, in the method for producing a static crushing agent according to the present invention, the crushing agent formed into dry powder is continuously granulated into a strong almond-shaped briquette by a briquetting machine at a high pressure, and thereafter, By crushing and forming into granules with a prescribed particle size distribution, the basic component and retarder are mixed appropriately in each granule to improve water absorption and hydration reactivity, and static hydration expansion pressure is large. Form a crushing agent.
【0017】また、静的破砕剤を粒径1〜2mmが15
〜20重量%、粒径2〜4mmが55〜60重量%、粒
径4〜5mmが35〜20重量%の粒度分布にした顆粒
に造粒したことによって、場所打杭の杭頭処理に用いる
と、粘性の高いベントナイト溶液又はベントナイト溶液
にCMCや分散剤を添加した安定液の中に沈漬した時
に、粘性の高い安定液が各顆粒を十分に包み込み、安定
液中の水分を顆粒表面から顆粒内部に浸透させて、静的
破砕剤に吸水させるとともに水和反応を生じさせ、適度
な時間経過を経て、コンクリート強度の発現に従い、水
和膨張圧が適正に発現するようになり、破砕計画線に沿
って数cm程度の亀裂を発生させ、余盛りコンクリート
を除去可能にする。Further, the static crushing agent has a particle size of 1 to 2 mm of 15
~ 20% by weight, particle size 2-4mm is 55-60% by weight, particle size 4-5mm is 35-20% by weight. And when it is immersed in a highly viscous bentonite solution or a stable solution containing CMC or a dispersant added to a bentonite solution, the highly viscous stable solution wraps each granule sufficiently, and the water in the stable solution is absorbed from the granule surface. Permeate the inside of the granules, let the static crushing agent absorb water and cause a hydration reaction, and after an appropriate time, the hydration expansion pressure will be properly expressed according to the concrete strength development. A crack of about several cm is generated along the line to enable removal of excess concrete.
【0018】[0018]
【実施例】静的破砕剤の一種であるCAB(住友セメン
ト社製商品名)を顆粒状に成形し、図3に示すように、
偏平状のスパイラルシース管1(最大径45mm、長さ
50cm)に充填した。そしてスパイラルシース管1の
両端部をネット4で塞ぎ、場所打杭コンクリート杭頭部
(直径1m)の切断計画線2上において、鉄筋篭3に沿
って複数個配設し、結束線で取付けた。次に、この鉄筋
篭3を杭孔内に挿入し、スパイラルシース管1を安定液
の中に沈めた後、コンクリートを打設した。そして、1
0日間経過してから堀り起こしたところ、上記切断計画
線2に沿って、幅1〜2cmの亀裂の発生が認められ
た。[Examples] CAB (trade name of Sumitomo Cement Co., Ltd.), which is a kind of static crushing agent, was molded into granules, and as shown in FIG.
It was filled in a flat spiral sheath tube 1 (maximum diameter 45 mm, length 50 cm). Then, both ends of the spiral sheath pipe 1 are closed with a net 4, and a plurality of them are arranged along a reinforcing bar cage 3 on the planned cutting line 2 of the cast-in-place concrete pile head (diameter 1 m) and attached with a binding wire. . Next, the rebar cage 3 was inserted into the pile hole, the spiral sheath tube 1 was submerged in the stabilizing solution, and then concrete was poured. And 1
When it was dug up after 0 days, a crack having a width of 1 to 2 cm was found along the planned cutting line 2.
【0019】[0019]
【発明の効果】以上説明したように、本発明に係る静的
破砕剤の製造方法によれば、乾粉に形成した破砕剤をブ
リケッティングマシンにより高い圧力で連続的に強固な
アーモンド状のブリケットに造粒し、その後、所定の粒
度分布に粉砕して形成したことにより、基本成分と遅延
剤とが各顆粒において適度に配合され、吸水性および水
和反応性が良くなるとともに水和膨張圧が大きくなっ
て、場所打杭の杭頭処理用としてコンクリート破砕能力
の大きな静的破砕剤を得ることができる。As described above, according to the method for producing a static crushing agent according to the present invention, the crushing agent formed in dry powder is continuously and strongly almond-shaped briquette by a briquetting machine at high pressure. Granules were formed into granules and then pulverized to a prescribed particle size distribution, so that the basic component and the retarder are properly blended in each granule, water absorption and hydration reactivity are improved, and hydration expansion pressure is improved. As a result, it is possible to obtain a static crushing agent having a high concrete crushing capacity for treating pile heads of cast-in-place piles.
【0020】また、静的破砕剤を粒径1〜2mmが15
〜20重量%、粒径2〜4mmが55〜60重量%、粒
径4〜5mmが35〜20重量%の粒度分布にした顆粒
に造粒したことによって、場所打杭の杭頭処理に用いる
と、掘削時に用いられる粘性の高いベントナイト溶液又
はベントナイト溶液にCMCや分散剤を添加した安定液
の中に沈漬された時に、粘性の高い安定液が各顆粒を十
分に包み込み、安定液中の水分を顆粒表面から顆粒内部
に浸透させ、充分に静的破砕剤に吸水させることができ
るとともに必要な水和反応を生じさせ、適度な時間経過
を経て、コンクリート強度の発現に従い、水和膨張圧を
適正に発現させることができ、破砕計画線に沿って数c
m程度の亀裂を発生させることができて、余盛りコンク
リートを容易に除去できるように杭頭を破断させること
ができる。The static crushing agent has a particle size of 1 to 2 mm of 15
~ 20% by weight, particle size 2-4mm is 55-60% by weight, particle size 4-5mm is 35-20% by weight. And when it is immersed in a highly viscous bentonite solution used in excavation or a stable solution in which CMC or a dispersant is added to a bentonite solution, the highly viscous stable solution sufficiently wraps each granule, Moisture penetrates from the surface of the granules into the granules and can be sufficiently absorbed by the static crushing agent, and the necessary hydration reaction occurs. Can be properly expressed, and a few c along the crushing plan line
A crack of about m can be generated, and the pile head can be broken so that the excess pile concrete can be easily removed.
【0021】このため、従来、必要とされた静的破砕剤
を容器に充填させる前作業としての混練水の計量や混練
作業等を省略することができ、前作業の簡素化および迅
速化を図ることができるとともに、余盛りコンクリート
の除去作業も容易となり、場所打杭の杭頭処理における
時間短縮および経費削減を実現させることができる。Therefore, it is possible to omit the kneading water and the kneading work as the pre-work for filling the container with the static crushing agent which has been conventionally required, and to simplify and speed up the pre-work. In addition, it is possible to easily remove the overfilled concrete, and it is possible to realize time reduction and cost reduction in the pile head treatment of cast-in-place piles.
【図1】本発明にかかる安定液を利用した杭頭処理工法
の作業工程を示す流れ図。FIG. 1 is a flow chart showing working steps of a pile head processing method using a stabilizing solution according to the present invention.
【図2】従来例の作業工程を示す流れ図。FIG. 2 is a flowchart showing a work process of a conventional example.
【図3】スパイラルシース管の鉄筋篭へ取り付けた状態
を示す斜視説明図。FIG. 3 is an explanatory perspective view showing a state in which a spiral sheath tube is attached to a rebar cage.
【符号説明】1 スパイラルシース管 2 切断計画線 3 鉄筋篭[Explanation of signs] 1 Spiral sheath tube 2 Planned cutting line 3 Reinforcing cage
Claims (1)
グマシンにより高い圧力で連続的に強固なアーモンド状
のブリケットに造粒し、その後粉砕して、粒径1〜2m
mが15〜20重量%、粒径2〜4mmが55〜60重
量%、粒径4〜5mmが35〜20重量%の粒度分布を
有する顆粒に形成することを特徴とする静的破砕剤の製
造方法。1. A crushing agent formed into dry powder is continuously granulated into a strong almond-shaped briquette at a high pressure by a briquetting machine, and then crushed to a particle size of 1 to 2 m.
A static crushing agent characterized by forming into granules having a particle size distribution in which m is 15 to 20% by weight, particle size 2 to 4 mm is 55 to 60% by weight, and particle size 4 to 5 mm is 35 to 20% by weight. Production method.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14360295A JP2610591B2 (en) | 1995-06-09 | 1995-06-09 | Manufacturing method of static crushing agent |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14360295A JP2610591B2 (en) | 1995-06-09 | 1995-06-09 | Manufacturing method of static crushing agent |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5337710A Division JPH08903B2 (en) | 1993-12-28 | 1993-12-28 | Static crushing agent |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH07316532A true JPH07316532A (en) | 1995-12-05 |
JP2610591B2 JP2610591B2 (en) | 1997-05-14 |
Family
ID=15342547
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14360295A Expired - Lifetime JP2610591B2 (en) | 1995-06-09 | 1995-06-09 | Manufacturing method of static crushing agent |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2610591B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113980655A (en) * | 2021-11-22 | 2022-01-28 | 安徽理工大学 | Preparation method of low water-agent-ratio static breaking agent slurry |
-
1995
- 1995-06-09 JP JP14360295A patent/JP2610591B2/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113980655A (en) * | 2021-11-22 | 2022-01-28 | 安徽理工大学 | Preparation method of low water-agent-ratio static breaking agent slurry |
Also Published As
Publication number | Publication date |
---|---|
JP2610591B2 (en) | 1997-05-14 |
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