JPH0678688B2 - Method to prevent backflow of injection grout in PC well - Google Patents
Method to prevent backflow of injection grout in PC wellInfo
- Publication number
- JPH0678688B2 JPH0678688B2 JP26456589A JP26456589A JPH0678688B2 JP H0678688 B2 JPH0678688 B2 JP H0678688B2 JP 26456589 A JP26456589 A JP 26456589A JP 26456589 A JP26456589 A JP 26456589A JP H0678688 B2 JPH0678688 B2 JP H0678688B2
- Authority
- JP
- Japan
- Prior art keywords
- grout
- injection
- well
- valve
- backflow
- 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
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、PCウエルの成形に際してシース孔内に注入す
るグラウトの逆流防止方法に関する。The present invention relates to a method for preventing backflow of grout that is injected into a sheath hole when molding a PC well.
従来、PCウエルの成形に当ってはシース孔内にPC鋼材を
緊張して配筋した後、このシース孔内にグラウトを注入
するものであるが、注入ノズルを外した直後に木栓を注
入口に打ち込んでグラウトの逆流を防止していた。Conventionally, when molding PC wells, the PC steel material is tensioned and laid in the sheath hole, and then grout is injected into this sheath hole.However, immediately after removing the injection nozzle, a wooden plug is poured. It was driven into the entrance to prevent backflow of grout.
一般にPCウエルのシース孔にグラウトを注入充填するに
は、吐出口よりも低い位置に設けられたグラウト注入口
からグラウトを圧入し、上方のグラウト吐出口からグラ
ウトの溢出をみてシース孔内全体にグラウトが完全に充
填されたのを検知し、グラウトの注入を止め吐出口を閉
じて注入ノズルを抜き木栓を打ち込むものであるが、グ
ラウトの注入終了時この注入口には吐出口との高低差に
よって逆流方向の圧力が作用している。Generally, to inject and fill grout into the sheath hole of the PC well, press grout into the grout injection port provided at a position lower than the discharge port, and see the grout overflow from the upper grout discharge port to fill the entire inside of the sheath hole. It detects when the grout is completely filled, stops the injection of the grout, closes the discharge port, pulls out the injection nozzle, and hits a wooden plug, but at the end of the injection of the grout, this injection port has a high and low level with the discharge port. Due to the difference, pressure in the reverse flow direction is acting.
このため、従来のように単に木栓を打ち込んで逆流を防
止する場合には、注入ノズルを外してから木栓を打ち込
むまでの時間に注入されたグラウトの相当量が逆流して
漏出する。For this reason, when the wooden plug is simply driven as in the conventional case to prevent backflow, a considerable amount of the grout injected during the time from the removal of the injection nozzle to the driving of the wooden plug flows back and leaks.
このような現象によりシース孔内のグラウトの量が少く
なってPC鋼材の固定が不足したり、防錆効果が減少する
おそれがあった。Due to such a phenomenon, the amount of grout in the sheath hole becomes small, which may result in insufficient fixation of the PC steel material or a decrease in rust preventive effect.
本発明の注入グラウトの逆流防止方法は、中空円錐体と
した形状で全体をゴム製とした逆流防止弁を用い、この
弁を挿入する注入口の成形に当って、挿入口端にテーパ
ー状部を形成するためのピンを使用してシース孔との連
通孔を形成し、前記逆流防止用の弁には先端部を開閉自
在とするための切込みを設けることによって、ゴムの弾
力性と逆流圧力を利用してグラウトの注入終了と同時に
注入口を閉塞することができるばかりでなく、注入口に
設けられているテーパー状部と逆流防止用弁の円錐部分
とが合致して弁の固定が完全となるというPCウエルにお
いて注入グラウトの逆流防止方法を提供するものであ
る。The method for preventing backflow of an injection grout of the present invention uses a backflow prevention valve which is made of rubber in the shape of a hollow cone, and when molding an injection port into which this valve is inserted, a tapered portion is formed at the end of the insertion port. By forming a communication hole with the sheath hole by using a pin for forming the valve, and by providing a cutout for opening and closing the tip of the valve for preventing backflow, the elasticity of the rubber and the backflow pressure are provided. Not only can the inlet be closed at the same time as the injection of grout is completed, but also the tapered portion provided at the inlet and the conical portion of the check valve can be matched to secure the valve completely. It provides a method for preventing backflow of injected grout in a PC well.
本発明のPCウエルにおいて注入グラウトの逆流防止方法
は、グラウト注入口の成形時において、注入口にテーパ
ー部を設けるため、円錐形の弁との接合がよく、またこ
の逆流防止用の弁は中空円錐体の形状であって全体をゴ
ム製とし、この円錐体の先端部に十字状に切り込みを設
けてこの部分を開閉自在とすることによって、グラウト
の注入時には先端が内側からの注入圧力によって開放さ
れ、またグラウトの注入が終了した際には先端部が外側
からのグラウトの逆流圧力によって閉塞されるものであ
って確実なグラウトの充填が期待できる。In the PC well of the present invention, the method for preventing the backflow of the injection grout is such that, when the grout injection port is molded, the injection port has a tapered portion, so that it is well joined to the conical valve, and this backflow prevention valve is hollow. The shape of the cone is made entirely of rubber, and by making a cross-shaped cut at the tip of this cone to open and close this part, the tip is opened by the injection pressure from the inside when pouring grout. In addition, when the injection of the grout is completed, the tip portion is closed by the backflow pressure of the grout from the outside, and reliable filling of the grout can be expected.
添付図面により本発明方法を説明すると、第１図はPCウ
エルＡの断面図であって、（１）は円筒形状のコンクリ
ート壁、（２）はこのコンクリート壁に十数本設けられ
ているPC鋼材（３）挿通用のシース孔である。（３）は
PC鋼材であって緊張固定されている。（４）はシース孔
（２）の下方に設けられているグラウト注入口であり、
（５）はウエルの上端のPC鋼材固定用の鍔金に設けられ
ているグラウト吐出口である。The method of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a cross-sectional view of a PC well A, in which (1) is a concrete wall having a cylindrical shape, and (2) is more than ten PCs provided on the concrete wall. It is a sheath hole for inserting the steel material (3). (3) is
It is a PC steel material that is tension-fixed. (4) is a grout injection port provided below the sheath hole (2),
(5) is a grout discharge port provided on the upper end of the well for fixing the PC steel material.
本発明はこの第１図に示すPCウエルＡのシース孔（２）
内に下方のグラウト注入口（４）からグラウトを注入充
填するに当っての注入口（４）の成形ならびにグラウト
を充填後のグラウトの逆流排出を防止するものであっ
て、第２図ならびに第３図はPCウエルＡ成形に際しての
グラウト注入口（４）の形成手段を示すものである。The present invention shows the sheath hole (2) of the PC well A shown in FIG.
It is intended to prevent the molding of the injection port (4) during the filling and filling of the grout from the lower grout injection port (4) and the backflow discharge of the grout after the filling of the grout. FIG. 3 shows a means for forming the grout injection port (4) at the time of molding the PC well A.
第２図はグラウト注入口（４）成形用のピン（16）の側
面図であって、この成形用ピン（16）は頭部のボルト
（17）近くにテーパー部（18）を形成してあり、第３図
の型組み図に示すようにピン（16）を型枠（15）を通し
てシース孔（２）まで貫通している。したがって、コン
クリートを打設後遠心力でPCウエルを成形した後ピン
（16）を引抜くとピン（16）のテーパー部（18）がコン
クリート壁外端に形成されたグラウト注入口（２）が形
成される。FIG. 2 is a side view of the pin (16) for molding the grout injection port (4). The molding pin (16) has a tapered portion (18) formed near the head bolt (17). As shown in the mold assembly diagram of FIG. 3, the pin (16) penetrates through the mold frame (15) to the sheath hole (2). Therefore, if the pin (16) is pulled out after the PC well is formed by centrifugal force after pouring the concrete, the taper part (18) of the pin (16) becomes the grout injection port (2) formed at the outer end of the concrete wall. It is formed.
第４図は本発明方法に使用するグラウト逆流防止用の弁
（10）の断面図であって全体にゴム製であって、図にお
いて形状が明瞭にされている如く先端部（11）を基部に
較べて鋭角状に成形した中空の円錐体であって、この先
端部（11）に十字状に切り込み線（13）を設けるもので
ある。FIG. 4 is a cross-sectional view of a valve (10) for preventing grout backflow used in the method of the present invention, which is made of rubber as a whole, and whose tip (11) has a base portion as shown in the figure. Is a hollow conical body formed into an acute angle as compared with, and has a cross-shaped cut line (13) at its tip (11).
第５図（イ）、（ロ）は本発明方法のシース孔（２）に
グラウトを注入する実施例図であって、共に弁（10）の
作用を示すものである。（イ）図において、（１）はPC
ウエルＡのコンクリート壁であり、グラウト注入ノズル
（12）をグラウト注入口（２）に取付けてあるゴム製の
弁（10）に当てて矢印の如くグラウトを注入すると弁
（10）の先端部（11）は内方からの圧力によって（1
1）′の如く外方に開きグラウトは注入口（２）からシ
ース孔に注入充填される。そして上方のグラウト吐出口
（５）からグラウトが溢出したのをみて注入を停止しグ
ラウト注入ノズル（12）を引抜く。すると第５図（ロ）
に示すようにグラウトには上方からの圧力によって逆流
する傾向があるが、図の矢印の如く圧力によって弁（1
0）の先端部（11）が閉塞してグラウトの逆流を防止す
るものである。FIGS. 5 (a) and 5 (b) are views showing an embodiment of injecting grout into the sheath hole (2) of the method of the present invention, both showing the action of the valve (10). (A) In the figure, (1) is a PC
It is the concrete wall of well A, and when the grout injection nozzle (12) is applied to the rubber valve (10) attached to the grout injection port (2) and the grout is injected as shown by the arrow, the tip of the valve (10) ( 11) depends on the pressure from the inside (1
As shown in 1) ', the grout is opened to the outside and the sheath hole is injected and filled from the injection port (2). Then, when the grout overflows from the upper grout discharge port (5), the injection is stopped and the grout injection nozzle (12) is pulled out. Then, Figure 5 (b)
As shown in Fig. 3, the grout tends to flow backward due to the pressure from above, but the valve (1
The tip (11) of (0) is closed to prevent the backflow of grout.
このグラウトの注入作業は弁（10）をグラウト注入口
（２）に装着したまま行うため、注入ノズル（12）を外
した場合であっても直ちにグラウトの逆流圧力によって
弁（10）の先端部（11）が閉るため少しのグラウトの漏
れもなく、シース孔（２）内にグラウトを完全に充填す
ることができる。This grout injection work is performed while the valve (10) is still attached to the grout injection port (2). Therefore, even if the injection nozzle (12) is removed, the backflow pressure of the grout immediately causes the tip of the valve (10). Since the (11) is closed, there is no leakage of grout and the sheath hole (2) can be completely filled with grout.
このように、本発明の注入グラウトの逆流防止方法は、
弁（10）をゴム製の先端部を鋭角状に成形した変形の円
錐体とし、この先端部（11）に開閉自在の切り込み線
（13）を設けることによってゴムの弾力性とグラウトの
逆流圧力を利用してグラウトの注入終了と同時に注入口
を閉塞することができ、しかも注入口の成形に当って挿
入するピンにテーパー角を形成してコンクリート壁にテ
ーパー部を成形することができて円錐形状体の弁の装着
を密にするためグラウトの逆流による漏れがなく、シー
ス孔内に完全にグラウトを充填させることができる。そ
して従来のようにグラウト注入後の注入ノズルの取外し
と同時に木栓を打ち込むような煩雑な操作もないとう作
業上の効果をも奏するものである。As described above, the method for preventing backflow of the injection grout of the present invention is
The valve (10) is a deformed conical body whose rubber tip is formed into an acute angle, and the tip (11) is provided with a cut line (13) that can be opened and closed. The injection port can be closed at the same time as the injection of grout is completed, and the tapered part can be formed on the concrete wall by forming the taper angle on the pin to be inserted when forming the injection port. Since the valve of the shaped body is installed tightly, there is no leakage due to backflow of the grout, and the grout can be completely filled in the sheath hole. Further, it also has an operational effect that there is no complicated operation such as driving a wooden plug at the same time as removing the injection nozzle after the grout injection as in the conventional case.
第１図はPCウエルの断面図を示し、第２図は注入口成形
用のピンの側面図を示す。第３図は注入口成形の実施例
図を示し、第４図はゴム製の逆流防止用の弁の断面図を
示す。第５図（イ）、（ロ）図は作用を示す実施例図で
ある。 （２）…シース孔、（３）…PC鋼材、 （４）…グラウト注入口、 （５）…グラウト吐出口、 （10）…逆流防止用弁、 （11）…弁の先端部、 （13）…切り込み線、 （16）…注入口成形用のピンFIG. 1 shows a sectional view of a PC well, and FIG. 2 shows a side view of a pin for molding an injection port. FIG. 3 shows an embodiment of injection molding, and FIG. 4 shows a cross-sectional view of a rubber check valve. 5 (a) and 5 (b) are embodiment diagrams showing the operation. (2) ... sheath hole, (3) ... PC steel material, (4) ... grout injection port, (5) ... grout discharge port, (10) ... backflow prevention valve, (11) ... valve tip, (13) )… Score line, (16)… injection port molding pin
Claims (1)
ス孔の下端に、該シース孔に連通するグラウト注入口を
設け、該グラウト注入口に、先端部を鋭角状に成形した
中空円錐体の該先端部に十字状の切込み線を設けたゴム
製の逆流防止弁を装着し、該逆流防止弁を介してグラウ
トを注入することを特徴とした、PCウエルにおいて注入
グラウトの逆流防止方法。1. A hollow in which a grout inlet communicating with the sheath hole is provided at the lower end of a sheath hole for arranging a PC steel material provided in a well wall body, and the grout inlet has a tip end formed in an acute angle shape. A rubber check valve provided with a cross-shaped cut line at the tip of the conical body, and grout is injected through the check valve, preventing backflow of the injection grout in the PC well. Method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26456589A JPH0678688B2 (en) | 1989-10-11 | 1989-10-11 | Method to prevent backflow of injection grout in PC well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26456589A JPH0678688B2 (en) | 1989-10-11 | 1989-10-11 | Method to prevent backflow of injection grout in PC well |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03125758A JPH03125758A (en) | 1991-05-29 |
| JPH0678688B2 true JPH0678688B2 (en) | 1994-10-05 |
Family
ID=17405052
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26456589A Expired - Fee Related JPH0678688B2 (en) | 1989-10-11 | 1989-10-11 | Method to prevent backflow of injection grout in PC well |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0678688B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000063427A (en) * | 2000-07-10 | 2000-11-06 | 양현승 | Precast concrete well foundation |
| KR101661317B1 (en) * | 2015-02-17 | 2016-09-29 | 강유광 | shower apparatus |
-
1989
- 1989-10-11 JP JP26456589A patent/JPH0678688B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03125758A (en) | 1991-05-29 |
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