CA1191362A - Mold and gasket seal for mansonry wall opening - Google Patents
Mold and gasket seal for mansonry wall openingInfo
- Publication number
- CA1191362A CA1191362A CA000435854A CA435854A CA1191362A CA 1191362 A CA1191362 A CA 1191362A CA 000435854 A CA000435854 A CA 000435854A CA 435854 A CA435854 A CA 435854A CA 1191362 A CA1191362 A CA 1191362A
- Authority
- CA
- Canada
- Prior art keywords
- mold
- segments
- segment
- opening
- named
- 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
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/02—Manhole shafts or other inspection chambers; Snow-filling openings; accessories
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/0043—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects with gaskets or sealing elements, e.g. for tunnelings or man holes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/28—Cores; Mandrels
- B28B7/30—Cores; Mandrels adjustable, collapsible, or expanding
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G15/00—Forms or shutterings for making openings, cavities, slits, or channels
- E04G15/06—Forms or shutterings for making openings, cavities, slits, or channels for cavities or channels in walls of floors, e.g. for making chimneys
- E04G15/063—Re-usable forms
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/02—Manhole shafts or other inspection chambers; Snow-filling openings; accessories
- E03F2005/028—Sealing joints between manhole segments
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Architecture (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Health & Medical Sciences (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Moulds, Cores, Or Mandrels (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A mold for forming an opening in a masonry wall is disclosed, being formed of three detachably-attached segments; two of the segments are equal in length but oppositely configured. The third segment is secured at its opposite ends to the first two segments at their respective non-meeting ends. The meeting ends of the first two segments are also secured together, whereby the mold can be collapsed inwardly. The mold is mounted in a masonry wall by a truss and collar slidably engaged thereon, the collar being selectively retained in position by an orthogonally-projecting bolt fixed at one end to one of two spaced-apart frames between which cementitious material is poured. The mold is formed in its outer periphery with a perimetrical groove adapted to retain the inner portion of a gasket seal, so that the latter can be permanently embedded in the cementitious material as the wall is cast.
A mold for forming an opening in a masonry wall is disclosed, being formed of three detachably-attached segments; two of the segments are equal in length but oppositely configured. The third segment is secured at its opposite ends to the first two segments at their respective non-meeting ends. The meeting ends of the first two segments are also secured together, whereby the mold can be collapsed inwardly. The mold is mounted in a masonry wall by a truss and collar slidably engaged thereon, the collar being selectively retained in position by an orthogonally-projecting bolt fixed at one end to one of two spaced-apart frames between which cementitious material is poured. The mold is formed in its outer periphery with a perimetrical groove adapted to retain the inner portion of a gasket seal, so that the latter can be permanently embedded in the cementitious material as the wall is cast.
Description
~9~3t;~
FTELD OF THE INV~NTION
The present invention relates to molds used to make openlng~
in a masonry wall at the time the latter is belng caat, more speclfically to an improved mold which i9 also adapted to install a permanent gasket seal all along the peripheral surface of the opening so made.
DESCRIPTION OF THE PRIOR ART
It is known to use molds to make openings in a ma~onry wall, such as manholes, septic tanks, underground electric vaults, etc. Typically, such mold3 are rlng-shaped and include two annular or circular forms adapted to be detachably secured together in abutting relationship. The meeting peripheral areaa of these abutting forms are designed to retain an annular sealing gasket.
According to practice, the pair of forms with the annular gasket in place are pos'itioned in the lower ~rea of two spaced-apart frames into which cementitious material i8 poured and allowed to cure or set to form the desired wall. After the material, usually concrete, ia hardened the forms are removed, leaving the gasket permanently embedded in the concrete and having a free portion projecting radially inwardLy into the opening.
The final step involves locating a pipe or other similar condult in the opening such that its outer surface i8 in compre~sive sealing contact with the gasket.
For descriptive purposes the masonry wall will hereinafter (except for the summary) be referred to as a concrete manhole and the pipe or conduit as a ~ewer pipe, although it will be app'reciated that other concrete structures and conduits are envisloned'as being within the scope of the invention. Also, the opening will be assumed to be circular in shape, although, clearly, it could be square, rectangular or aven other shape3.
The gasket seal described above is highly desirable to prevent any ex-filtration of effluent into the subsoil adjacent the manhole and sewer pipe. Nat onl~ does such leakage pollute ~13~
the ground but it can alao cause shlftlng or settin8 of the ground 7 thereby destroylng the connection between manhole and sewer pipe even more, Conversely, if the joint is not leakproof, infiltration of ground wster into the sewer pipe and/or manhole can occur, swelllng the volume of e~fluent and raising the cos~ of pumping and tran~porting the latter in a sewer system.
Thus, the prior art has evolved various mold rings to secure a gasket seal in place while slmulta-neously forming an opening in a manhole wall. Thre~ pertinent examples of the art are: the Canadian Patent to Ditcher, besring number 1,085,889 and lssued September 16, 1980;
the Canadian Patent to Palazzo, bearing number 1,069,993 and issued June 24, 1980; and another Canadian P~tent to Ditcher, number 971,997, issued July 29, 1975.
Discussing first the two Patent~ to Ditcher, it will be observed ~hat both patents are characterized py a mold including two sep~rable forms or sections, abutting each other and having means for tightly 3ecuring them together.
In both patents, the~e forms are positioned between two concentric spaced-apart shells which receive concrete to form the manhole wall. The concrete has to be completely se~ before the forms canbe removed. Moreover, both frame~
must be completely disassembled before the forms can be removed.
Another significant disadvantage of these two patents, as well a~ others to be found in the prior art, is that two workers are required to remove the forms after the manhole framès have been disassembled: one worker on each side o the opening. OBviously, if only one worker is available, he will have to clamber in and out of the manhole to remove the two forms. This is inefficient labour, since manholes are nowadays precast at a manufacturing site, using mass-production techniques. Also, as is known to ., ~
~9~3~
those skilled in the art, it frequently happens that such rigid forms must be dislodged from the concrete wlth hammers or ~imllar tool~. Ii this is not done carefully--as sometimes happens with unskilled labour--the gasket sealcan be damaged.
Directing attention now to the Palazzo Patent, the latter teachas ths use of a unitary cyllndrical insert arou~d which i8 positioned à rubber band having ~n outer peripheral groove adap~ed to recelve a sealing rin8~
Adjustment means are also provided to celect the desired vertical location of the manhole opening to be made. It is to be noted that this adjustmsnt means involves modification to the outside wall 16 (Fig. 7) in the guise of a plurality of spaced position holes 18 formed therein.
Although the insert is made of a single piece, it will be further noted that it6 removal mlght ~till prove to be difficult because of the rigidity, notwithstanding the fact that it can be removed from elther side of the opening. Here again, the concrete must be completely hardened before removal of the insert is possible.
OBJECTS OF THE INVENTION
It is therefore ~n i~portant ob~ect of the present invention to provide a mold for makin~ an opening in a masonry wall which is very easy to remove once the cementitious material has sufficiently set.
It i~ another object of the present invention to p~ovida a mold of the above type, which can be removed qulckly bX a single worker.
It is yet another object of the present invention to provide a mold of the above type, which is fully adapted for use in manufacturing processes using ma~s-production techniques.
It i8 still another object of the present invention to provide a mold of the above type, which allows 13~;~
one of the frames to be removed before the cementitiou~ material ~' has completely ~et, thereby freeing the mold,to be used with another manhole to be made SUMMARY OF THE INYENTION
According to the instant invention, there is provided a mold, preferably circular in shap,e, adapted to be positioned in a pair of spaced masonry w~ll frames to make an opening therein at the same time the wall i9 cast of cement-itious material.
The mold comprises three perimetrical segments detachably attached together and definlng a free interior space. Two of the segments are of the same len~th a~d identic~
ally but oppositely configured, preierably forming a major portion of the mold. These two segments are each provided with a pivotal securing means at one end whereby, when the third segment i9 removed, they can be pivoted about the pivotal securing means towards each other into the free interior space. The third segment completes the sh2ps of the annular mold by having its two opposite ends lying flush with the oeher ends of the first two segments. Attachment means are provided to attach the third segment to the other two segments. Both end face~
of this third segment are outwardly sli&htly inwardly dlvergin~, whereby it can be pulled free of the first two segments into the free interior space upon detachment of the attaLhment means.
Preferably~ the pivotal ~ecuring means can itself be dismantled, whereby the three segments can be completely disengaged from each other.
The mold is further characterized by a position-ing means whi'ch allows it to be mounted between the two 3paced-apart frames into which the cementitious m~terial of the masonry wall i~ to be cast. The po~itioning means i,8 vertic- -ally adjustable 90 that the opening to be formed in the m~00nry wall can be precisely height-ad~usted according to desired specific-ations. A secondary function of the positionlng means is to ,, . . . . . , ~ ..... .
3~'~
reinEorce the mold when the latter is in place between the two Erames .
The outer peripheral suriace of the mold, when assembled, is formed with a centrally-running groove adapted to receive the conduit-engaging or inner portion of a continuou~
gasket seal~ The Reripheral surface on both sides of this groove are preferably upwardly outw~rdly flared, a~ i8 known in the art, to provide some play for the condu.tt when it i8 installed in the opening, a9 well as after it iB in place.
Thus, the three a~sembled segments will form a precisely-dlmen-3ioned opening in a masonry wall. The opening will have a smooth double flared surface with the centrally~disposed gasket seal permanently embedded in the surrounding cementitious material by its anchoring portion, described in more detail herebelow.
The foregoing will be more clearly understood by referring to the following description of the preferred embodiment, taken together with the accompanying drawings.
BRI~F DESCRIPT~ON OF THF DRAWINGS
Figur.e 1 is A front elevation of the mold ac-cording to the invention;
Figures 2 to 4 are front elevation~ showing how the mold is disassembled;
Figure 5 is a vertically cross-sectioned elevation of the mold in place between the two frames of a manhol~
ready to receive concrete therebetween;
Figure 6 is a similar view to that o~f Figure 5 showing a por~ion of the mold after the concrete has been poured and without the two frames;
Figure 7 is e horizontally cross-sectioned plan view of the mold in a manhole wall after the concrete has been poured;
Figure 8 i9 another vertically cross-sectloned ~1~13~
elevation of the opening in a manhole wall, al80 showing the gasket seAl in compressive contact with a ~ect$on of sewer pipe in9 talled therein;
Figure 9 is a croYs-sectional elev~tion ahowing how a sewer pipe can be installed such that its lower interior surface lies flush with the floor of the manhole;
Figure ~0 is an elevation of a manhole in da~hed outline, partly sectioned and a portion of a sewer pipe installed in an opening made by the mold o the invention; and Figure 11 is a cross-sectional elevation of a concrete manhole wall, also showing a gasket seal permanently embedded therein with the dashed line suggesting the outer sur-face of the sewer pipe.
Like numerals refer to like elements throughout the drawings~
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring firstly to Figures 1 to 4 inclusively, there is shown the mold ring 1 according to the invention.
Mold ring 1 is comprised of three segment~: a pair of first and second ~egments 2 and 3, of the same arcuate length but oppositely configured, and a third shor~ segment 4.
The meeting ends of both se8ments 2 and 3 are each provided with a pivotal securing means consisting of two pairs oE radially inwardly-projecting lugs 5, 6, and 7, 8 welded or otherwise rLgidly secured to segments 2, 3 respectively, (best seen in Fig. 7). Lugs 5, 6 are parallel and spaced-apart as are lugs 7, 8, one pair lapping the other. Bot~h pairs of lugs also extend slightly beyond their corresponding end faces
FTELD OF THE INV~NTION
The present invention relates to molds used to make openlng~
in a masonry wall at the time the latter is belng caat, more speclfically to an improved mold which i9 also adapted to install a permanent gasket seal all along the peripheral surface of the opening so made.
DESCRIPTION OF THE PRIOR ART
It is known to use molds to make openings in a ma~onry wall, such as manholes, septic tanks, underground electric vaults, etc. Typically, such mold3 are rlng-shaped and include two annular or circular forms adapted to be detachably secured together in abutting relationship. The meeting peripheral areaa of these abutting forms are designed to retain an annular sealing gasket.
According to practice, the pair of forms with the annular gasket in place are pos'itioned in the lower ~rea of two spaced-apart frames into which cementitious material i8 poured and allowed to cure or set to form the desired wall. After the material, usually concrete, ia hardened the forms are removed, leaving the gasket permanently embedded in the concrete and having a free portion projecting radially inwardLy into the opening.
The final step involves locating a pipe or other similar condult in the opening such that its outer surface i8 in compre~sive sealing contact with the gasket.
For descriptive purposes the masonry wall will hereinafter (except for the summary) be referred to as a concrete manhole and the pipe or conduit as a ~ewer pipe, although it will be app'reciated that other concrete structures and conduits are envisloned'as being within the scope of the invention. Also, the opening will be assumed to be circular in shape, although, clearly, it could be square, rectangular or aven other shape3.
The gasket seal described above is highly desirable to prevent any ex-filtration of effluent into the subsoil adjacent the manhole and sewer pipe. Nat onl~ does such leakage pollute ~13~
the ground but it can alao cause shlftlng or settin8 of the ground 7 thereby destroylng the connection between manhole and sewer pipe even more, Conversely, if the joint is not leakproof, infiltration of ground wster into the sewer pipe and/or manhole can occur, swelllng the volume of e~fluent and raising the cos~ of pumping and tran~porting the latter in a sewer system.
Thus, the prior art has evolved various mold rings to secure a gasket seal in place while slmulta-neously forming an opening in a manhole wall. Thre~ pertinent examples of the art are: the Canadian Patent to Ditcher, besring number 1,085,889 and lssued September 16, 1980;
the Canadian Patent to Palazzo, bearing number 1,069,993 and issued June 24, 1980; and another Canadian P~tent to Ditcher, number 971,997, issued July 29, 1975.
Discussing first the two Patent~ to Ditcher, it will be observed ~hat both patents are characterized py a mold including two sep~rable forms or sections, abutting each other and having means for tightly 3ecuring them together.
In both patents, the~e forms are positioned between two concentric spaced-apart shells which receive concrete to form the manhole wall. The concrete has to be completely se~ before the forms canbe removed. Moreover, both frame~
must be completely disassembled before the forms can be removed.
Another significant disadvantage of these two patents, as well a~ others to be found in the prior art, is that two workers are required to remove the forms after the manhole framès have been disassembled: one worker on each side o the opening. OBviously, if only one worker is available, he will have to clamber in and out of the manhole to remove the two forms. This is inefficient labour, since manholes are nowadays precast at a manufacturing site, using mass-production techniques. Also, as is known to ., ~
~9~3~
those skilled in the art, it frequently happens that such rigid forms must be dislodged from the concrete wlth hammers or ~imllar tool~. Ii this is not done carefully--as sometimes happens with unskilled labour--the gasket sealcan be damaged.
Directing attention now to the Palazzo Patent, the latter teachas ths use of a unitary cyllndrical insert arou~d which i8 positioned à rubber band having ~n outer peripheral groove adap~ed to recelve a sealing rin8~
Adjustment means are also provided to celect the desired vertical location of the manhole opening to be made. It is to be noted that this adjustmsnt means involves modification to the outside wall 16 (Fig. 7) in the guise of a plurality of spaced position holes 18 formed therein.
Although the insert is made of a single piece, it will be further noted that it6 removal mlght ~till prove to be difficult because of the rigidity, notwithstanding the fact that it can be removed from elther side of the opening. Here again, the concrete must be completely hardened before removal of the insert is possible.
OBJECTS OF THE INVENTION
It is therefore ~n i~portant ob~ect of the present invention to provide a mold for makin~ an opening in a masonry wall which is very easy to remove once the cementitious material has sufficiently set.
It i~ another object of the present invention to p~ovida a mold of the above type, which can be removed qulckly bX a single worker.
It is yet another object of the present invention to provide a mold of the above type, which is fully adapted for use in manufacturing processes using ma~s-production techniques.
It i8 still another object of the present invention to provide a mold of the above type, which allows 13~;~
one of the frames to be removed before the cementitiou~ material ~' has completely ~et, thereby freeing the mold,to be used with another manhole to be made SUMMARY OF THE INYENTION
According to the instant invention, there is provided a mold, preferably circular in shap,e, adapted to be positioned in a pair of spaced masonry w~ll frames to make an opening therein at the same time the wall i9 cast of cement-itious material.
The mold comprises three perimetrical segments detachably attached together and definlng a free interior space. Two of the segments are of the same len~th a~d identic~
ally but oppositely configured, preierably forming a major portion of the mold. These two segments are each provided with a pivotal securing means at one end whereby, when the third segment i9 removed, they can be pivoted about the pivotal securing means towards each other into the free interior space. The third segment completes the sh2ps of the annular mold by having its two opposite ends lying flush with the oeher ends of the first two segments. Attachment means are provided to attach the third segment to the other two segments. Both end face~
of this third segment are outwardly sli&htly inwardly dlvergin~, whereby it can be pulled free of the first two segments into the free interior space upon detachment of the attaLhment means.
Preferably~ the pivotal ~ecuring means can itself be dismantled, whereby the three segments can be completely disengaged from each other.
The mold is further characterized by a position-ing means whi'ch allows it to be mounted between the two 3paced-apart frames into which the cementitious m~terial of the masonry wall i~ to be cast. The po~itioning means i,8 vertic- -ally adjustable 90 that the opening to be formed in the m~00nry wall can be precisely height-ad~usted according to desired specific-ations. A secondary function of the positionlng means is to ,, . . . . . , ~ ..... .
3~'~
reinEorce the mold when the latter is in place between the two Erames .
The outer peripheral suriace of the mold, when assembled, is formed with a centrally-running groove adapted to receive the conduit-engaging or inner portion of a continuou~
gasket seal~ The Reripheral surface on both sides of this groove are preferably upwardly outw~rdly flared, a~ i8 known in the art, to provide some play for the condu.tt when it i8 installed in the opening, a9 well as after it iB in place.
Thus, the three a~sembled segments will form a precisely-dlmen-3ioned opening in a masonry wall. The opening will have a smooth double flared surface with the centrally~disposed gasket seal permanently embedded in the surrounding cementitious material by its anchoring portion, described in more detail herebelow.
The foregoing will be more clearly understood by referring to the following description of the preferred embodiment, taken together with the accompanying drawings.
BRI~F DESCRIPT~ON OF THF DRAWINGS
Figur.e 1 is A front elevation of the mold ac-cording to the invention;
Figures 2 to 4 are front elevation~ showing how the mold is disassembled;
Figure 5 is a vertically cross-sectioned elevation of the mold in place between the two frames of a manhol~
ready to receive concrete therebetween;
Figure 6 is a similar view to that o~f Figure 5 showing a por~ion of the mold after the concrete has been poured and without the two frames;
Figure 7 is e horizontally cross-sectioned plan view of the mold in a manhole wall after the concrete has been poured;
Figure 8 i9 another vertically cross-sectloned ~1~13~
elevation of the opening in a manhole wall, al80 showing the gasket seAl in compressive contact with a ~ect$on of sewer pipe in9 talled therein;
Figure 9 is a croYs-sectional elev~tion ahowing how a sewer pipe can be installed such that its lower interior surface lies flush with the floor of the manhole;
Figure ~0 is an elevation of a manhole in da~hed outline, partly sectioned and a portion of a sewer pipe installed in an opening made by the mold o the invention; and Figure 11 is a cross-sectional elevation of a concrete manhole wall, also showing a gasket seal permanently embedded therein with the dashed line suggesting the outer sur-face of the sewer pipe.
Like numerals refer to like elements throughout the drawings~
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring firstly to Figures 1 to 4 inclusively, there is shown the mold ring 1 according to the invention.
Mold ring 1 is comprised of three segment~: a pair of first and second ~egments 2 and 3, of the same arcuate length but oppositely configured, and a third shor~ segment 4.
The meeting ends of both se8ments 2 and 3 are each provided with a pivotal securing means consisting of two pairs oE radially inwardly-projecting lugs 5, 6, and 7, 8 welded or otherwise rLgidly secured to segments 2, 3 respectively, (best seen in Fig. 7). Lugs 5, 6 are parallel and spaced-apart as are lugs 7, 8, one pair lapping the other. Bot~h pairs of lugs also extend slightly beyond their corresponding end faces
2', 3' respectively and are made with holes 9, the latter being in reglstry with one another and adapted to receive a tr&nsverse pivot pin 10. Pin 10 is bent at one end and kept ln place by a removable cotter pin 11 at it~ other end. Figure 3 shows how segments 2, 3 can be pivoted about pin 10 inwardly once
3~
the third segment 4 has been removed.
The opposite end faces 2", 3" of segments 2, 3 are slightly inwardly divergent. Third segment 4 has two end faces 4', similarly outwardly convergent, that lle flush against faces 2", 3" when mold l is assembled.
Segment ~ is fixed to ~egments 2, 3 by 8 detachable attachment means embodiPd by two arcuate plates 12 rigl~ly 3ecured to the inner surface of segment 4. P~ates 12 are sufficiently long to overlap the adjacent inner surface portlons of segments 2, 3 and are removably secured to the latter by bolts 13.
P~eferring now to Figures 5 to 7 incluaively, mold 1 is shown installed in a way that fulfills its function.
Mold l is located between two spaced-apart concentric frames 14, l$. The3e frames deflne the size and shape of the manhole wall to be formed. Figure 7 clearly shows how mold 1 18 horizontally circularly shaped to closely conform ~o the contour of a manhole 16.
The annular mold 1 i3 cross-sectionally hollow and is formed with a circumferentially-extending central groove 17 that is preferably shaped cross-sec~ionally like 13 ri8ht triangle. Upper surfaces 18, 19 on either side of groove 17 are flared outwardly from groove 17 to provide some lateral and vertical freedom of movement to a sewer pipe which will be later installed in the opening made by mold l.
The positioning means for mold 1 consists of a rigid diametrically-extending truss 20 in combination with a collar 21 slidSIbly mounted on the truss. Collar 21 has a hole in one of its sides registering with a nut 25, which is welded to collar 21. Nut 25 i8 threadedly engaged by an elongated threaded bolt 22, the latter projecting orthogonally outwardly through the outer frame 14 and being fixedly secured thereagainst by a nut 23 and plate 24. To select a preclse vertical positioning of mold ring l between the two frames ~i9~L3ti~
14, l5, a worker ~imply locks collar 21 a8ainst truss 20 b~
screwing bolt 22 into nut 25 ~mtil it firml~abut~ again3t trus~ 20, and then he tighten~ nut 23. Such design obviates the need to modify outer frame 14.
Lu~3 5, 6 of segment 2 are joined at their end0 remote from pivot pin 10 by a transverse lug 26 defining an inwardly-open rectangular space 27. One end of tru~s 20 fits removably into this apace defining a first holding means.
The mid-area of the interior surface of third segment 4 is formed with a second holding means for the oppo-site end of truss 20, consistlng of a third pair of inwardly-projecting, parallel and ~paced-apart lugs 28, 29 which are clo3ed at one end by another transverse lug 29'. l'he ends of lugs 28, 29 opening towards outer freme 14 are closed by a removable pin 30, which is bent at one end and held in place by a cotter pin 31 at its other end, slmilar to the pivot pin 10,although pin 30 is obviously not a pivot pin.
Groove 17 is adapted to receive an annular ~0 gasket seal ~2. Seal 32 has an inner portion 32l which con-form~ exactly to the cro3s-sectional shape of groove 17 and an anchoring portion 32" including"a short stem and a wider cros~-sectionally round end. Preferably, the exposed ~ide of inner portion 32' is slightly upwardly inclined towarda the stem. Seal 32 is made of extruded rubber or rubber-like material.
When the concrete 33 1~ poured around mold 1, seal 32 w~ll have its anchoring portion 32" firmly and perm~nently embedded in concrete 33.
The use of mold 1 includes its installation in frames 14 and 15 with gasket 3eal 32 in pl~ce ln groove 17.
After mold 1 is vertically adjusted to a precise lccation b~ means of collar 21, concrete 33 is poured into frame~ 14 _ 9 _ 3~
and 15 according t.o accepted method. Thls i9 done at a factory. The concrete 1B then cured by stearn for a number of hours (usually eight ~or a standard size manhole).
It will be clear from the foregolng that mold 1 can be withdrawn from its opening 34 from either sLde of the manhole. Another significant improvement over the prior art is that one of the fra~es--usually the outer frnme 14--can be removed before the concrete has completely set. Thi8 saves a significant amount of mold idle time: in fact, it ha3 been found that the mold can be removed and used for casting another manhole after about four hours' curing time, or half the total curing time requirad.
It is to be noted that mold 1 of ~he prèsent invention can be used for manhole walls of varying thicknes0 by 8imply using more than one mold slde by side between the frames.
Referrin8 now to Figures 9 to 11 inclusively, there is shown a manhole having an opening 34. Annular g~sket 32 is permanently embedded in con rete 33, having its inner portlon 32' projectlng into opening 34. A sewer pipe 35 is positioned in opening 34 such that its outer surface 35' compresses gasket 32, thereby providing a tight effectlve seal between the manhole opening 34 and sewer pipe 35, all around the peripheral surfsce of the former.
Another advantage of the mold 1 is depicted in Figures 9 to 11; it is that opening 34 can be vertically located such that its bottom portion periphery is slightly lower than the floor ~0 of the manhole, whereby sewer pipe 35 can be inserted into opening 34, such that its interior lower surface lies flush with the bottom portion periphery of the openingO
This is possible because mold 1 is removed from opening 34 by disassembling segments 2, 3, and 4 into the interior space defined by mold 1. In the prior art discussed above, lt would not be possible to cast opening 34 lower than floor 40, i .
913~
slnce one of ~he mold forms must be removed laterally lnto the manhol e .
Fi~ure 11 ahows by dashed outllne the po~ltlon of the outer surface of a sewer pipe 35.
:.
the third segment 4 has been removed.
The opposite end faces 2", 3" of segments 2, 3 are slightly inwardly divergent. Third segment 4 has two end faces 4', similarly outwardly convergent, that lle flush against faces 2", 3" when mold l is assembled.
Segment ~ is fixed to ~egments 2, 3 by 8 detachable attachment means embodiPd by two arcuate plates 12 rigl~ly 3ecured to the inner surface of segment 4. P~ates 12 are sufficiently long to overlap the adjacent inner surface portlons of segments 2, 3 and are removably secured to the latter by bolts 13.
P~eferring now to Figures 5 to 7 incluaively, mold 1 is shown installed in a way that fulfills its function.
Mold l is located between two spaced-apart concentric frames 14, l$. The3e frames deflne the size and shape of the manhole wall to be formed. Figure 7 clearly shows how mold 1 18 horizontally circularly shaped to closely conform ~o the contour of a manhole 16.
The annular mold 1 i3 cross-sectionally hollow and is formed with a circumferentially-extending central groove 17 that is preferably shaped cross-sec~ionally like 13 ri8ht triangle. Upper surfaces 18, 19 on either side of groove 17 are flared outwardly from groove 17 to provide some lateral and vertical freedom of movement to a sewer pipe which will be later installed in the opening made by mold l.
The positioning means for mold 1 consists of a rigid diametrically-extending truss 20 in combination with a collar 21 slidSIbly mounted on the truss. Collar 21 has a hole in one of its sides registering with a nut 25, which is welded to collar 21. Nut 25 i8 threadedly engaged by an elongated threaded bolt 22, the latter projecting orthogonally outwardly through the outer frame 14 and being fixedly secured thereagainst by a nut 23 and plate 24. To select a preclse vertical positioning of mold ring l between the two frames ~i9~L3ti~
14, l5, a worker ~imply locks collar 21 a8ainst truss 20 b~
screwing bolt 22 into nut 25 ~mtil it firml~abut~ again3t trus~ 20, and then he tighten~ nut 23. Such design obviates the need to modify outer frame 14.
Lu~3 5, 6 of segment 2 are joined at their end0 remote from pivot pin 10 by a transverse lug 26 defining an inwardly-open rectangular space 27. One end of tru~s 20 fits removably into this apace defining a first holding means.
The mid-area of the interior surface of third segment 4 is formed with a second holding means for the oppo-site end of truss 20, consistlng of a third pair of inwardly-projecting, parallel and ~paced-apart lugs 28, 29 which are clo3ed at one end by another transverse lug 29'. l'he ends of lugs 28, 29 opening towards outer freme 14 are closed by a removable pin 30, which is bent at one end and held in place by a cotter pin 31 at its other end, slmilar to the pivot pin 10,although pin 30 is obviously not a pivot pin.
Groove 17 is adapted to receive an annular ~0 gasket seal ~2. Seal 32 has an inner portion 32l which con-form~ exactly to the cro3s-sectional shape of groove 17 and an anchoring portion 32" including"a short stem and a wider cros~-sectionally round end. Preferably, the exposed ~ide of inner portion 32' is slightly upwardly inclined towarda the stem. Seal 32 is made of extruded rubber or rubber-like material.
When the concrete 33 1~ poured around mold 1, seal 32 w~ll have its anchoring portion 32" firmly and perm~nently embedded in concrete 33.
The use of mold 1 includes its installation in frames 14 and 15 with gasket 3eal 32 in pl~ce ln groove 17.
After mold 1 is vertically adjusted to a precise lccation b~ means of collar 21, concrete 33 is poured into frame~ 14 _ 9 _ 3~
and 15 according t.o accepted method. Thls i9 done at a factory. The concrete 1B then cured by stearn for a number of hours (usually eight ~or a standard size manhole).
It will be clear from the foregolng that mold 1 can be withdrawn from its opening 34 from either sLde of the manhole. Another significant improvement over the prior art is that one of the fra~es--usually the outer frnme 14--can be removed before the concrete has completely set. Thi8 saves a significant amount of mold idle time: in fact, it ha3 been found that the mold can be removed and used for casting another manhole after about four hours' curing time, or half the total curing time requirad.
It is to be noted that mold 1 of ~he prèsent invention can be used for manhole walls of varying thicknes0 by 8imply using more than one mold slde by side between the frames.
Referrin8 now to Figures 9 to 11 inclusively, there is shown a manhole having an opening 34. Annular g~sket 32 is permanently embedded in con rete 33, having its inner portlon 32' projectlng into opening 34. A sewer pipe 35 is positioned in opening 34 such that its outer surface 35' compresses gasket 32, thereby providing a tight effectlve seal between the manhole opening 34 and sewer pipe 35, all around the peripheral surfsce of the former.
Another advantage of the mold 1 is depicted in Figures 9 to 11; it is that opening 34 can be vertically located such that its bottom portion periphery is slightly lower than the floor ~0 of the manhole, whereby sewer pipe 35 can be inserted into opening 34, such that its interior lower surface lies flush with the bottom portion periphery of the openingO
This is possible because mold 1 is removed from opening 34 by disassembling segments 2, 3, and 4 into the interior space defined by mold 1. In the prior art discussed above, lt would not be possible to cast opening 34 lower than floor 40, i .
913~
slnce one of ~he mold forms must be removed laterally lnto the manhol e .
Fi~ure 11 ahows by dashed outllne the po~ltlon of the outer surface of a sewer pipe 35.
:.
Claims (7)
PROPERTY OR PRIVILEGE IS CLAIMED, ARE DEFINED
AS FOLLOWS:
1. A mold for forming an opening in a masonry wall and positioning a pipe-sealing gasket at the periphery of said opening, said mold being formed of three perimetrical segments removably fastened together in end-to-end relation by fastening means and defining a free interior space; two of said segments being of substantially the same length but oppositely configured and meeting at one end; said third segment completing the shape of said mold by having its opposite ends lying flush with the other ends of the first-named two segments;
said mold being further provided with a positioning means, whereby the mold can be securely located between two spaced-apart frames between which cementitious material is poured to cast the mansonry wall; said mold being further formed with an outer perimetrically-running groove adapted to receive the inner portion of a continuous gasket seal, having an integrally-formed outer anchoring portion adapted to be permanently embedded in said cementitious material; said third segment and then said first-named two segments movable into said interior space to clear said gasket seal inner portion.
said mold being further provided with a positioning means, whereby the mold can be securely located between two spaced-apart frames between which cementitious material is poured to cast the mansonry wall; said mold being further formed with an outer perimetrically-running groove adapted to receive the inner portion of a continuous gasket seal, having an integrally-formed outer anchoring portion adapted to be permanently embedded in said cementitious material; said third segment and then said first-named two segments movable into said interior space to clear said gasket seal inner portion.
2. A mold as defined in claim 1, wherein said mold is in the shape of a ring when assembled, said opening is circular and said masonry wall is the wall of a manhole.
3. A mold as defined in claim 2, wherein said three segments are of arcuate shape and said third segment is shorter than said first two segments.
4. A mold as defined in claim 3, wherein the fastening means at the meeting ends of the first-named two segments consists of two pairs of radially inwardly-projecting lugs, one pair secured to each of said first-named two segments at their said meeting ends; said two pairs of lugs lapping each other, each extending slightly beyond their corresponding end faces and having holes in registry with one another formed thereat;
and a pivot pin removably expending through said holes, whereby said first-named two segments can be pivoted into said interior space after removal of said third segment.
and a pivot pin removably expending through said holes, whereby said first-named two segments can be pivoted into said interior space after removal of said third segment.
5. A mold as defined in claim 4, wherein said fastening means at the ends of said third segment consists of two arcuate plates rigidly secured to the inner surface of said third segment; said plates being sufficiently long to overlap the adjacent inner surface portions of said first-named two segments and removably secured to the latter by bolts.
6. A mold as defined in claim 1, wherein said positioning means consists of a rigid truss diametrically extending within said interior space and detachably secured to said ring at its opposite ends by first and second holding means; a collar slidably mounted on said truss; said collar having a threaded hole in one of its sides; an elongated bolt threadedly engaged in said hole and projecting orthogonally outwardly through one of said frames, being fixedly and detach-ably secured to the latter; said bolt engageable against said truss, whereby said mold can be adjustably positioned between said frames by adjusting the position of said truss within said collar.
7. A mold as defined in claim 1, 2 or 3, wherein the opposite ends of said third segment are inwardly divergent to facilitate moving said third segment into said interior space.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000435854A CA1191362A (en) | 1983-09-01 | 1983-09-01 | Mold and gasket seal for mansonry wall opening |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000435854A CA1191362A (en) | 1983-09-01 | 1983-09-01 | Mold and gasket seal for mansonry wall opening |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1191362A true CA1191362A (en) | 1985-08-06 |
Family
ID=4125989
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000435854A Expired CA1191362A (en) | 1983-09-01 | 1983-09-01 | Mold and gasket seal for mansonry wall opening |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1191362A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6450505B1 (en) | 1998-12-18 | 2002-09-17 | Norman W. Gavin | Seal for casting in a concrete wall of a fluid distribution system container |
| EP1688561A2 (en) * | 2005-02-02 | 2006-08-09 | Aco Severin Ahlmann Gmbh & Co. Kg | Form for drain |
| CN108166755A (en) * | 2018-02-10 | 2018-06-15 | 吴士传 | The detachable waffle bucket of split fast disassembly type |
| CN109296198A (en) * | 2018-11-15 | 2019-02-01 | 西安建筑科技大学 | The construction method of the loam wall of punch die and cast-in-situ reinforced concrete column is made in steel |
-
1983
- 1983-09-01 CA CA000435854A patent/CA1191362A/en not_active Expired
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6450505B1 (en) | 1998-12-18 | 2002-09-17 | Norman W. Gavin | Seal for casting in a concrete wall of a fluid distribution system container |
| US6609718B1 (en) | 1998-12-18 | 2003-08-26 | Norman W. Gavin | Seal for casting in a concrete wall of a fluid distribution system container |
| EP1688561A2 (en) * | 2005-02-02 | 2006-08-09 | Aco Severin Ahlmann Gmbh & Co. Kg | Form for drain |
| EP1688561A3 (en) * | 2005-02-02 | 2009-09-02 | Aco Severin Ahlmann Gmbh & Co. Kg | Form for drain |
| CN108166755A (en) * | 2018-02-10 | 2018-06-15 | 吴士传 | The detachable waffle bucket of split fast disassembly type |
| CN108166755B (en) * | 2018-02-10 | 2023-12-29 | 吴士传 | Split quick-dismantling type detachable wafer barrel |
| CN109296198A (en) * | 2018-11-15 | 2019-02-01 | 西安建筑科技大学 | The construction method of the loam wall of punch die and cast-in-situ reinforced concrete column is made in steel |
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