JP3207911U - Mortar leakage prevention jig - Google Patents

Abstract

【課題】マンホール蓋受枠設置工事でのモルタル打設工事において、硬化前のモルタルの漏出を効果的に防止できるモルタル漏出防止用治具を提供する。【解決手段】モルタル漏出防止用治具１は、帯状鋼板を環状に曲げてなる円環１０と、円環１０の内側に設けたパンタグラフ式ねじジャッキ構造の拡縮器２０とからなり、円環１０の両端近傍に拡縮器２０の各拡縮端部２１を固定して円環２０の直径を拡縮可能とし、さらに、水平部が円環１０の外側に突出する高さ調節可能な略逆さＬ字型のハンドル１２を円環１０の内側の少なくとも３か所に設けたことを特徴とする。【選択図】図７To provide a mortar leakage preventing jig capable of effectively preventing leakage of mortar before curing in mortar placing work in manhole cover receiving frame installation work. A mortar leakage preventing jig includes an annular ring formed by bending a strip-shaped steel plate into an annular shape, and a pantograph type screw jack structure expander / contractor provided inside the annular ring. The expansion / contraction end portions 21 of the expansion / contraction device 20 are fixed in the vicinity of both ends of the circular ring 20 so that the diameter of the annular ring 20 can be expanded and contracted. The handle 12 is provided at at least three locations inside the ring 10. [Selection] Figure 7

Description

本考案は、マンホール蓋のリング状の受枠を下桝上端に設置するモルタル打設工程において、硬化前のモルタル漏出を防止するための治具に関する。   The present invention relates to a jig for preventing leakage of mortar before curing in a mortar placing process in which a ring-shaped receiving frame of a manhole cover is installed at the upper end of a lower heel.

一般的なマンホールは、図１の断面略図に示す如く、地中に埋設施工したコンクリート製の下桝の上端開口部にマンホール蓋を載置する受枠を設置固定している。下桝の構造は概ね規格化されており、その上端開口部は原則として水平であるが、マンホール蓋を道路等の地表のレベルや傾斜角度に適合させるために、受枠は複数の高さ調整ボルトによって必要な傾斜角を付けて下桝上端面に取り付けられる。そして、受枠と下桝上端面との間の空間にモルタルを充填し、養生硬化させることで下桝に受枠が設置固定される。その後、下桝周囲の埋め戻し及び舗装を行い、受枠のリング部のみが舗装面に露出する形となる。 In general manholes, as shown in a schematic cross-sectional view of FIG. 1, a receiving frame for placing a manhole cover is installed and fixed in an upper end opening portion of a concrete underlay buried in the ground. The structure of the lower arm is generally standardized, and the upper end opening is horizontal in principle. However, in order to adapt the manhole cover to the level and inclination angle of the ground such as roads, the receiving frame has a plurality of height adjustment bolts. Is attached to the upper end surface of the lower collar with a necessary inclination angle. Then, the receiving frame is installed and fixed to the lower rod by filling the space between the receiving frame and the upper end surface of the lower rod with mortar and curing it. After that, backfilling and pavement around the lower iron are performed, and only the ring portion of the receiving frame is exposed on the pavement surface.

図２は、普及している受枠の一例の略図であり、図３は下桝上端面への受枠の取り付け箇所の一例を拡大した断面略図である。図３中のＧ１は舗装面、Ｇ２は受枠の設置位置、Ｇ３は下桝の上端面を示しており、Ｇ１とＧ２の間は舗装材により埋設される。また、Ｇ２とＧ３の間は必要に応じて調整ボルトにより高さが調整され、充填されたモルタルが硬化することで受枠への荷重を支承する。また、モルタルは受枠に設けた複数の孔のうち、高さ調整ボルトを設置しない空いた穴から充填される。 FIG. 2 is a schematic view of an example of a popular receiving frame, and FIG. 3 is an enlarged schematic cross-sectional view of an example of a mounting position of the receiving frame on the upper end surface of the lower eyelid. In FIG. 3, G1 indicates a pavement surface, G2 indicates an installation position of the receiving frame, G3 indicates an upper end surface of the lower arm, and a space between G1 and G2 is embedded with a pavement material. The height between G2 and G3 is adjusted by adjusting bolts as necessary, and the loaded mortar is cured to support the load on the receiving frame. Also, the mortar is filled from a plurality of holes provided in the receiving frame through a hole that is not provided with a height adjusting bolt.

近年は、受枠の構造や形状、高さ調整ボルトの改良が進むとともに、モルタル自体も高流動性、超早強性、無収縮性の製品が普及している。高流動性により、充填時に小さな隙間にも容易に流れ込んで均一な充填が可能となる。超早強性により、硬化時間が短くなり、圧縮強度が向上する。無収縮性により、セメントと細骨材（砂）を水で練り混ぜた従来のモルタルのような硬化後の収縮がなくなるため、受枠と下桝の間に隙間が生じず、密着性が高まる。 In recent years, as the structure and shape of the receiving frame and the height adjustment bolt have been improved, products with high fluidity, ultra-high strength, and non-shrinkable mortar have become widespread. Due to the high fluidity, it is possible to easily flow into even a small gap during filling and to perform uniform filling. The ultra-fast strength shortens the curing time and improves the compressive strength. Due to the non-shrinkage, there is no shrinkage after curing as in a conventional mortar in which cement and fine aggregate (sand) are kneaded with water, so that there is no gap between the receiving frame and the lower iron, and the adhesion is improved.

ところで、モルタルの充填打設は、図４乃至図６に示すごとく、受枠の高さ調整後に受枠と下桝との間の高さ調整空間の内外両側面を帯状のウレタンフォームで密閉して行い、モルタルの硬化後にウレタンフォームを除去する。この際、外フォームについては、高さ調整空間の外周に巻き付けた後粘着テープで固定し、さらにベルトによって外周面を緊縛できるため硬化前のモルタルの漏出は十分に防止できる。しかし、内フォームについては、図４に示すごとくウレタン自らの弾性によって高さ調整空間の内周面に密着するものの、十分に圧着されるわけではない。前述のとおり高流動性のモルタルは充填時に小さな隙間にも容易に浸透するため、図６の（４）図に示すごとく、モルタル自体の重量により柔らかい内フォームの下端にたわみが生じ、下桝内壁との隙間からモルタルが漏出しやすいという問題があった。
日之出水道機器株式会社ホームページ＞プロダクト情報＞「ハイジャスター（登録商標）」＞製品特徴 ＵＲＬ：http://www.hinodesuido.co.jp/solution/city/productinformation/sewer/sewerhj.html By the way, as shown in FIGS. 4 to 6, mortar filling is performed by sealing the inner and outer side surfaces of the height adjustment space between the receiving frame and the lower collar with a belt-shaped urethane foam after adjusting the height of the receiving frame. The urethane foam is removed after the mortar is cured. At this time, the outer foam is wound around the outer periphery of the height adjusting space and then fixed with an adhesive tape. Further, the outer peripheral surface can be bound by a belt, so that leakage of mortar before curing can be sufficiently prevented. However, as shown in FIG. 4, the inner foam is in close contact with the inner peripheral surface of the height adjustment space by the elasticity of urethane itself, but is not sufficiently crimped. As described above, since the high flow mortar easily penetrates into a small gap when filling, as shown in FIG. 6 (4), the lower end of the soft inner foam is bent due to the weight of the mortar itself. There was a problem that mortar easily leaked from the gap.
Hinoide Water Supply Equipment Co., Ltd. Home Page> Product Information> “Hijuster (registered trademark)”> Product Features URL: http://www.hinodesuido.co.jp/solution/city/productinformation/sewer/sewerhj.html

モルタルの漏出により硬化後に高さ調整空間に空洞を生じると受枠の耐荷重強度が低下し、モルタルや舗装材の破損を生じる等、経年劣化を早めることとなる。そのため、施工者はこれまで、受枠内側に木材や竹材等のつっかい棒を嵌め込んで内フォームの内側面を支える等、応急的対策を講じてモルタルの漏出を防ごうと試みてきたが、漏出を完全に防止することは困難であった。 If a cavity is formed in the height adjustment space after curing due to leakage of the mortar, the load bearing strength of the receiving frame is lowered, and the mortar and the paving material are damaged, thereby aging is accelerated. For this reason, the installer has so far tried to take urgent measures to prevent leakage of mortar, such as by inserting a stick of wood or bamboo inside the receiving frame to support the inner surface of the inner foam. It was difficult to completely prevent leakage.

本考案は、前記の点を鑑みて創作されたものであり、マンホール蓋受枠設置工事でのモルタル打設工事において、硬化前のモルタルの漏出を効果的に防止できるモルタル漏出防止用治具を提供することを課題とする。   The present invention was created in view of the above points, and provides a mortar leakage prevention jig that can effectively prevent leakage of mortar before curing in mortar placement work in manhole cover frame installation work. The task is to do.

上記の課題を解決するために、請求項１に記載した考案は、直径を拡縮可能な円環と、円環の内側に設けた拡縮器とからなることを特徴とする。ベルト等で緊縛固定が可能な外フォームとは異なり、内フォームは受枠と下桝との間の高さ調整空間にウレタン自体の弾性のみで密着するため、モルタルの重量によって下端に隙間が生じ易いことが漏出の原因である。本考案の構成によれば、内フォームの内側全周に当接させた円環の直径を拡縮器により拡張し、内フォームの下端を下桝内壁に均一に密着させることで、効果的にモルタルの漏出を防止できる。また、モルタルの硬化後は、拡縮器で円環の直径を収縮させれば容易に撤去できる。   In order to solve the above-mentioned problems, the invention described in claim 1 is characterized by comprising an annular ring whose diameter can be expanded and contracted, and an expander / contractor provided inside the annular ring. Unlike the outer foam, which can be fixed with a belt, etc., the inner foam is in close contact with the height adjustment space between the receiving frame and the lower collar only by the elasticity of the urethane itself. This is the cause of leakage. According to the configuration of the present invention, the diameter of the annular ring that is in contact with the entire inner periphery of the inner foam is expanded by the expander / contractor, and the lower end of the inner foam is brought into close contact with the inner wall of the lower collar, thereby effectively mortaring. Can prevent leakage. In addition, after the mortar is cured, it can be easily removed by shrinking the diameter of the ring with an expander.

また、請求項２に記載した考案は、請求項１に記載したモルタル漏出防止用治具であって、円環を帯状鋼板を環状に曲げたもの、拡縮器をパンタグラフ式ねじジャッキとして、拡縮器の各拡縮端部に前記帯状鋼板の両端をそれぞれ固定したことを特徴とする。円環としては、拡張時に内フォーム内面に深く食い込み過ぎない程度の幅の帯状鋼板が適当であるが、素材は必ずしも鋼に限定されない。拡縮器としてのパンタグラフ式ねじジャッキは、自動車に搭載される簡易な手動式タイヤ交換用ジャッキと同様の構造で、本来は上下方向に拡縮するものを水平方向に拡縮するように適用する。油圧方式や電動方式も適用可能だが、マンホール内の狭隘な作業空間で使用すること、拡張完了まで落下しないよう保持する必要があることを考慮すれば、可能な限り軽量で嵩張らない本考案の構成が好適である。   Further, the invention described in claim 2 is the mortar leakage preventing jig according to claim 1, wherein the ring is formed by bending a strip steel plate into an annular shape, and the expander is a pantograph screw jack. The both ends of the said strip steel plate were each fixed to each expansion / contraction end part of this. As the circular ring, a strip-shaped steel plate having a width that does not deeply penetrate into the inner foam inner surface when expanded is suitable, but the material is not necessarily limited to steel. A pantograph type screw jack as an expander / contractor has a structure similar to that of a simple manual tire replacement jack mounted on an automobile, and is originally applied to expand or contract in the horizontal direction what is vertically expanded or contracted. The hydraulic system and the electric system can be applied, but the configuration of the present invention is as light and bulky as possible, considering that it should be used in a narrow work space in the manhole and that it must be held so that it will not fall until expansion is completed. Is preferred.

さらに、請求項３に記載した考案は、請求項１または請求項２に記載したモルタル漏出防止用治具において、水平部が円環の外側に突出する高さ調節可能な略逆さＬ字型のハンドルを円環の内側の少なくとも３か所に設けたことを特徴とする。ハンドルは、モルタル漏出防止用治具の運搬やマンホール内への設置時の取り扱いの利便性を高めるとともに、円環の外側に突出する略逆さＬ字型の水平部を受枠の上面に引っ掛けることで、作業者が保持していなくても拡張前や収縮後の円環がマンホール内に落下することを防止できる。また、ハンドルは高さ調節可能に構成しているため、予め受枠上面から円環を内フォーム内面に密着させる位置までの距離に合わせてハンドルの高さを設定して固定しておくことで、円環を受枠内に投入後直ちに拡縮器で円環を拡張させて内フォームを固定できる。   Further, the invention described in claim 3 is a jig for preventing leakage of mortar according to claim 1 or claim 2, wherein the horizontal portion protrudes outside the ring and is adjustable in height. The handle is provided in at least three places inside the ring. The handle improves the convenience of carrying the mortar leakage prevention jig and handling it when installed in a manhole, and hooks a substantially inverted L-shaped horizontal part protruding outside the ring onto the upper surface of the receiving frame. Even if the operator does not hold it, the ring before expansion or after contraction can be prevented from falling into the manhole. In addition, since the handle is configured to be adjustable in height, by setting and fixing the handle height according to the distance from the upper surface of the receiving frame to the position where the annular ring is in close contact with the inner foam inner surface, Immediately after inserting the ring into the receiving frame, the inner form can be fixed by expanding the ring with an expander.

本考案に係るモルタル漏出防止用治具によれば、マンホール蓋受枠設置工事でのモルタル打設工事において、充填した硬化前のモルタルが内フォームと下桝内壁との隙間から漏出することを効果的に防止できる。極めて簡易な構造で廉価に製造可能であり、円環の拡張・収縮も拡縮器のねじを手動で回転させるだけで可能なため、特段の技能や経験も必要としない。さらに、マンホール内でつっかい棒等を使用しないため、本治具を適用中であってもマンホールへ内への人の出入りの障害とならない。   According to the jig for preventing leakage of mortar according to the present invention, in the mortar placement work in the manhole cover receiving frame installation work, it is effective that the filled mortar leaks from the gap between the inner foam and the inner wall of the lower arm. Can be prevented. It can be manufactured at a low cost with an extremely simple structure, and the ring can be expanded and contracted simply by manually rotating the expander screw, so that no special skill or experience is required. Further, since a stick or the like is not used in the manhole, even if this jig is applied, it does not become an obstacle to the person entering and exiting the manhole.

以下、本考案の実施形態について図を用いて説明する。図７は、本考案の実施形態に係るモルタル漏出防止用治具の構成を示す斜視図、図８は同平面図、図９は同側面図、図１０はモルタル漏出防止用治具の適用状態を示す側面図である。モルタル漏出防止用治具１は、帯状鋼板を環状に曲げてなる円環１０と、拡縮器２０と、３つの略逆さＬ字型のハンドル１２とから構成される。拡縮器２０はパンタグラフ式ねじジャッキであり、その各拡縮端部２１に円環１０の両端をそれぞれ固定している。円環１０の帯状鋼板の両端は接続せずに一部を重ねており、拡縮器２０上端の回転部２２をバール等によって手動で回転させることにより拡縮端部２１が水平方向に拡張すると重なり部１１が開いて円環１０の直径が拡張する。また、ハンドル１２は、円環１０の内側面に設けた円管状のハンドル取付部１３に垂直部を挿入し、留めねじ１４により任意の高さで固定可能としている。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. 7 is a perspective view showing a configuration of a mortar leakage preventing jig according to an embodiment of the present invention, FIG. 8 is a plan view thereof, FIG. 9 is a side view thereof, and FIG. 10 is an application state of the mortar leakage preventing jig. FIG. The mortar leakage preventing jig 1 includes a ring 10 formed by bending a belt-shaped steel plate in an annular shape, an expander / contractor 20, and three substantially inverted L-shaped handles 12. The expander / contractor 20 is a pantograph screw jack, and both ends of the ring 10 are fixed to the respective expansion / contraction end portions 21. Both ends of the strip-shaped steel plate of the ring 10 are overlapped without being connected, and when the expanding / contracting end portion 21 is expanded in the horizontal direction by manually rotating the rotating portion 22 at the upper end of the expanding / contracting device 20 with a bar or the like, the overlapping portion 11 opens and the diameter of the ring 10 expands. Further, the handle 12 can be fixed at an arbitrary height by inserting a vertical portion into a tubular handle mounting portion 13 provided on the inner surface of the annular ring 10, and using a retaining screw 14.

施工時には、調整ボルトによる受枠の高さ調整の終了後、受枠と下桝との間の高さ調整空間の内外両側面を内フォーム、外フォームで覆い、外フォームは従来どおりに粘着テープやベルトで固定する。一方、モルタル漏出防止用治具１のハンドル１２を、あらかじめ計測しておいた受枠上面から円環を内フォーム内面に密着させる位置までの距離に合わせた高さに留めねじ１４で固定する。その際、ハンドル１２の水平部は円環１０の外側に向けて突出する位置で固定する。   During construction, after adjusting the height of the receiving frame with the adjusting bolt, cover both the inner and outer sides of the height adjustment space between the receiving frame and the lower arm with inner foam and outer foam. Secure with. On the other hand, the handle 12 of the mortar leakage preventing jig 1 is fixed with a retaining screw 14 at a height that matches the distance from the upper surface of the receiving frame that has been measured in advance to the position where the annular ring is in close contact with the inner surface of the inner foam. At that time, the horizontal portion of the handle 12 is fixed at a position protruding toward the outside of the ring 10.

次に、ハンドル１２を持って円環１０を受枠に挿入し、受枠の縁の上面にハンドル１２を引っ掛ける形でモルタル漏出防止用治具１を載置することにより、円環１０は適切な位置に保持される。その上で、回転部２２をバール等で回転させて円環１０を内フォームに当接させ、さらに内フォームが下桝内壁に適度に密着するまで円環１０の直径を拡張する。
その後は、従来どおりモルタルを充填して硬化させる。硬化後は、回転部２２を逆回転して円環１０の直径を収縮させ、ハンドル１２を持って受枠からモルタル漏出防止用治具１を取り外し、内外のウレタンフォームを除去し工程が完了する。 Next, the annular ring 10 is inserted into the receiving frame by holding the handle 12, and the annular mortar leakage preventing jig 1 is placed in an appropriate position by hooking the handle 12 on the upper surface of the edge of the receiving frame. Retained. Then, the rotating portion 22 is rotated by a bar or the like to bring the annular ring 10 into contact with the inner foam, and further, the diameter of the annular ring 10 is expanded until the inner foam is appropriately adhered to the inner wall of the lower eyelid.
Thereafter, the mortar is filled and cured as usual. After the curing, the rotating part 22 is rotated in the reverse direction to contract the diameter of the annular ring 10, the handle 12 is held, the mortar leakage preventing jig 1 is removed from the receiving frame, the inner and outer urethane foam is removed, and the process is completed.

以上、本考案の実施形態について図面を参照しつつ説明したが、本考案は、必ずしも上述した構成にのみ限定されるものではなく、本考案の目的を達成し、効果を有する範囲内において、適宜変更実施することが可能なものであり、本考案の技術的思想の範囲内に属する限り、それらは本考案の技術的範囲に属する。   As mentioned above, although embodiment of this invention was described referring drawings, this invention is not necessarily limited only to the structure mentioned above, In the range which achieves the objective of this invention and has an effect, suitably As long as they can be modified and fall within the scope of the technical idea of the present invention, they belong to the technical scope of the present invention.

本考案に係るモルタル漏出防止用治具は、マンホール工事におけるモルタル充填打設工において利用可能であり、ウレタンフォームを用いたモルタル硬化の養生作業の効率化と工事品質の向上に資するものである。 The jig for preventing leakage of mortar according to the present invention can be used in mortar filling and placing work in manhole work, and contributes to improving the efficiency of work for curing mortar using urethane foam and improving work quality.

一般的なマンホールの構造を示す断面略図である。It is a section schematic diagram showing the structure of a general manhole. 一般的に普及しているマンホール蓋の受枠の一例の略図である。1 is a schematic view of an example of a receiving frame for a manhole cover that is commonly used. 下桝上端面への受枠の取り付け箇所の一例を拡大した断面略図である。It is the cross-sectional schematic which expanded an example of the attachment location of the receiving frame to a lower collar upper end surface. 内外のウレタンフォームと受枠への内フォームの取付方法を示す略図である。It is the schematic which shows the attachment method of the inner foam to inner and outer urethane foam and a receiving frame. 内外フォーム取付後のモルタルの充填方法を示す略図である。It is the schematic which shows the filling method of the mortar after inner and outer form attachment. 従来技術での作業工程におけるモルタルの漏出を示す断面略図である。It is a cross-sectional schematic diagram which shows the leakage of the mortar in the operation process by a prior art. 実施形態に係るモルタル漏出防止用治具の構成を示す斜視図である。It is a perspective view which shows the structure of the jig | tool for mortar leak prevention which concerns on embodiment. 実施形態に係るモルタル漏出防止用治具の平面図である。It is a top view of the jig for prevention of mortar leakage concerning an embodiment. 実施形態に係るモルタル漏出防止用治具の側面図である。It is a side view of the jig for prevention of mortar leakage concerning an embodiment. 実施形態に係るモルタル漏出防止用治具の適用状態を示す側面図である。It is a side view which shows the application state of the jig | tool for mortar leak prevention which concerns on embodiment.

１ モルタル漏出防止用治具
１０ 円環
１１ 重なり部
１２ ハンドル
１３ ハンドル取付部
１４ 留めねじ
２０ 拡縮器
２１ 拡縮端部
２２ 回転部
２３ ジャッキねじ 1 Mortar Leakage Prevention Jig 10 Ring 11 Overlap 12 Handle
13 Handle mounting portion 14 Retaining screw 20 Expander / contractor 21 Expanding / contracting end portion 22 Rotating portion 23 Jack screw

Claims (3)

マンホール蓋の受枠を下桝上端に設置するモルタル打設工に用いるモルタル漏出防止用治具であって、
直径を拡縮可能な円環と、円環の内側に設けた拡縮器とからなることを特徴とする、モルタル漏出防止用治具。 A mortar leakage prevention jig used in a mortar placing work in which a receiving frame of a manhole cover is installed at the upper end of the lower arm,
A jig for preventing leakage of mortar, characterized by comprising an annular ring whose diameter can be expanded and contracted and an expander / contractor provided inside the annular ring. 前記円環は帯状鋼板を環状に曲げてなり、前記拡縮器はパンタグラフ式ねじジャッキであって、前記拡縮器の各拡縮端部に前記帯状鋼板の両端をそれぞれ固定してなることを特徴とする、請求項１に記載のモルタル漏出防止用治具。   The annular ring is formed by bending a belt-shaped steel plate into an annular shape, and the expander / contractor is a pantograph screw jack, and both ends of the strip-shaped steel plate are fixed to respective expansion / contraction end portions of the expander / contractor. The jig for preventing mortar leakage according to claim 1. 水平部が円環の外側に突出する高さ調節可能な略逆さＬ字型のハンドルを前記円環の内側の少なくとも３か所に設けたことを特徴とする、請求項１または請求項２のいずれかに記載のモルタル漏出防止用治具。
3. The height-adjustable substantially inverted L-shaped handle having a horizontal portion protruding outside the ring is provided at at least three positions inside the ring. The mortar leakage preventing jig according to any one of the above.