CA1231063A - Beaver guard for drainage culvert - Google Patents
Beaver guard for drainage culvertInfo
- Publication number
- CA1231063A CA1231063A CA000454730A CA454730A CA1231063A CA 1231063 A CA1231063 A CA 1231063A CA 000454730 A CA000454730 A CA 000454730A CA 454730 A CA454730 A CA 454730A CA 1231063 A CA1231063 A CA 1231063A
- Authority
- CA
- Canada
- Prior art keywords
- grid
- culvert
- opening
- roadway
- guard
- 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
- E03F7/00—Other installations or implements for operating sewer systems, e.g. for preventing or indicating stoppage; Emptying cesspools
- E03F7/06—Devices for restraining rats or other animals
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F5/00—Draining the sub-base, i.e. subgrade or ground-work, e.g. embankment of roads or of the ballastway of railways or draining-off road surface or ballastway drainage by trenches, culverts, or conduits or other specially adapted means
- E01F5/005—Culverts ; Head-structures for culverts, or for drainage-conduit outlets in slopes
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Road Paving Structures (AREA)
Abstract
"BEAVER GUARD FOR DRAINAGE CULVERT"
ABSTRACT OF THE DISCLOSURE
A guard is provided for placement over the upstream opening of a culvert, to bar beavers from entering the culvert and to provide a useful means for dislodging the dam wall which the beavers will build against the guard.
The guard comprises a flexible grid consisting of longitudinally extending, spaced apart steel chains, to which are welded a plurality of transversely extending , spaced apart, rigid steel rods. The width of the grid is sufficient to extend across the culvert opening and bear against the culvert side wall; the length of the grid is sufficient so that it extends along the ground surface in front of the culvert opening, so as to be positioned beneath the beaver dam wall. Means are provided at the upper end of the grid, for securing it to the culvert or roadway, so that the grid remains hung over the opening. A long chain extends from the lower end of the grid, which chain is always available to be grasped and which may be attached to a vehicle on the roadway. This provides a means for rolling up the grid and bringing its load of ac-cumulated debris onto the roadway for disposal.
ABSTRACT OF THE DISCLOSURE
A guard is provided for placement over the upstream opening of a culvert, to bar beavers from entering the culvert and to provide a useful means for dislodging the dam wall which the beavers will build against the guard.
The guard comprises a flexible grid consisting of longitudinally extending, spaced apart steel chains, to which are welded a plurality of transversely extending , spaced apart, rigid steel rods. The width of the grid is sufficient to extend across the culvert opening and bear against the culvert side wall; the length of the grid is sufficient so that it extends along the ground surface in front of the culvert opening, so as to be positioned beneath the beaver dam wall. Means are provided at the upper end of the grid, for securing it to the culvert or roadway, so that the grid remains hung over the opening. A long chain extends from the lower end of the grid, which chain is always available to be grasped and which may be attached to a vehicle on the roadway. This provides a means for rolling up the grid and bringing its load of ac-cumulated debris onto the roadway for disposal.
Description
2 Field of the Invention
3 The present invention relates to a guard for placement at the
4 upstream opening of a drainage culvértj to bar beaversifrom entering the culvert and to provide a means for dislodging the dam which the beavers 6 will build at the opening.
7 Prior Art 7 Of the sixteen orders of placental mammals, the most plentiful 8 species are the order 'rodentia'. It is to this order that the amphibious 9 beaver (Family: Costarred) belongs.
The beaver dam is probably the first construction undertaken 11 by a beaver colony. The dam, composed of sticks, stones, roots and 12 earth, is commenced by the laying of sticks and branches in a parallel 3 upwardly extending arrangement along a narrow point of the riparian bed.
4 Stones, roots and earth are plastered onto this parallel branch frame-work to form a first layer. The dam is constructed by the gradual build 16 up, layer by layer of a series of such solid-filled branch frameworks.
17 Uprooted culverts are rapidly dammed by beavers in this manner, 18 necessitating the use of costly excavation equipment and many man-hours 19 of labor to unplug the culvert. Further, merely maintaining unprotected culverts in a clear condition is a laborious and expensive task.
21 Various attempts to discourage dam building within culverts, 22 exemplary of which are the use of bright, moving streamers or the like, 23 have not proved successful.
24 Conventional culvert guards are available and comprise, in essence, a rigid wire screen secured over the culvert end. While such 26 protectors effectively prevent dam building within the culvert, they fail, 27 however, to deter the beavers From building the dam upon the screen face.
28 Such a dam must be subsequently removed in the manner previously referred 29 to.
~ll2'33l(~6;3 1 Perception of the need for a guard having rapid and inexpensive 2 clean-up capability, and a knowledge of beaver behavioral patterns have 3 been combined to provide the present device which while simple in concept, 4 is effective in use.
SUMMARY OF TOE INVENTION
6 In accordance with the present invention, there is provided a7 guard for placement over the upstream opening of a culvert. This guard 8 comprises a flexible grid which assumes a generally L-shaped configuration g when in use. Preferably the grid comprises transverse spaced apart steel rods welded to a pair of spaced apart, longitudinally extending steel chains. The upwardly extending section of the grid, which covers the 12 opening, functions to bar the beavers from entering the culvert to build the dam, and provides a base framework or lattice against which the beavers will construct the dam wall. The foot section of the grid ox-tends upstream some distance along the ground surface and provides a 16 movable substrate on which the dam wall will stand. The upstream end of the grid foot section has an elongate member or tail attached thereto 18 such as a length of steel chain, which can be pulled on, to partially 19 roll up the grid, thereby dislodging the mass supported by it. The backed-up water will then swiftly wash the packed earth out of the dislodged 21 wall, leaving a light, mainly wooden assemblage which can relatively 22 easily be rolled onto the roadway by continuing to pull on the tail chain.23 The guard is characterized by a number of advantages and 24 characteristics, namely:
(1) it does not normally interfere with the flow of water 26 through the culvert 27 (2) it is characterized by load-bearing capability so that it 28 can be used to dislodge and manipulate the dam mass 29 supported by it, to start the water flowing, which water then does most of the work in removing heavy components, 31 particularly the earth, that assist in making up the dam, slob 1 (3) the tail chain is readily accessible and a.car.or.truck 2 can be tied onito.itj to provide the pull needed to first 3 dislodge the.dam:.and then draw the grid onto the roadway 4 to recover the residue material;
(4) the grid is operative to-keep the beaver out of the 6 culvert;
7 (5) the beaver will start their construction immediately 8 against the grid, sup that the dam Hall ends up being 9 positioned on the foot section; and (6) because the guard can be very quickly cleaned, it is 11 feasible to use a frequent maintenance schedule, to avoid 12 permitting the beaver to build up the dam wall to a point 13 where it becomes difficult and time-consuming to break it 14 down.
DESCRIPTION OF THE DRAWINGS
16 Figure 1 is Kaplan view of the guard; and 17 Figure 2 is a perspective view of the guard in place over a 18 culvert opening.
19 DESCRIPTION OF.THE~PREFERRED EMBODIMENT
The guard 1 comprises a flexible grid 2 formed by welding 21 a plurality of transversely extending, spaced apart, steel rods 3 to a 22 pair of spaced apart, longitudinally extending steel chains 4.
23 The rods 3 are spaced apart about 4", to prevent a full-sized 24 beaver from squeezing there between.
1.231~b~3 l The chains 4 are~brought-~ogether at their upper ends and 2 joined to form a loop 5. This loop 5 may be secured to the culvert 6 3 by hanging it over the bent back upper lip 7 of the culvert. The 4 loop 5 therefore provides means, attached to the upper end of the grid 2, for Sacramento to the culvert or the roadway or the structure through 6 which the culvert extends, so that the grid may be positioned to extend 7 across the culvert opening I as required.
8 The chains 4 are also brought together at their lower ends 9 and a long tail chain 9 secured thereto.
The grid 2 is sufficiently wide, for example about 4" wider if than the diameter of the culvert, so that it will extend across the full 12 diameter of the culvert opening 8 and bear against the side edges of the 3 culvert 6. The length of the grid 2 is sufficient so that it will extend 4 along the ground surface lo in front of the culvert opening 8, perhaps three feet, to provide a foot section if which will underlie the dam (not shown.
16 In use! the grid's upper section 12 extends across the culvert 7 opening. The transverse rods 3 prevent the beavers from entering the 18 culvert 6 and building their dam therein. The beavers when barred in 19 this manner, normally use the grid upper section 12 as the dam wall frame and build against it. The grid foot section if thus underlies the dam.
21 When the dam is to be removed, the long tail chain 9, whose end is left 22 accessible on the bank of the stream, is attached to a vehicle on the 23 roadway. The vehicle can then be backed up and rocked to roll up the grid 24 2 to a limited extent. This loosens the dam mass and the backed up water seeps through. In short order, the flow becomes a turbulent stream and 26 the heavy earth in the dam is washed away, leaving a relatively light 27 assemblage of branches and the like. The vehicle can then be backed 28 up further to roll this debris onto the roadway.
29 The scope of the invention is defined by the following claims.
7 Prior Art 7 Of the sixteen orders of placental mammals, the most plentiful 8 species are the order 'rodentia'. It is to this order that the amphibious 9 beaver (Family: Costarred) belongs.
The beaver dam is probably the first construction undertaken 11 by a beaver colony. The dam, composed of sticks, stones, roots and 12 earth, is commenced by the laying of sticks and branches in a parallel 3 upwardly extending arrangement along a narrow point of the riparian bed.
4 Stones, roots and earth are plastered onto this parallel branch frame-work to form a first layer. The dam is constructed by the gradual build 16 up, layer by layer of a series of such solid-filled branch frameworks.
17 Uprooted culverts are rapidly dammed by beavers in this manner, 18 necessitating the use of costly excavation equipment and many man-hours 19 of labor to unplug the culvert. Further, merely maintaining unprotected culverts in a clear condition is a laborious and expensive task.
21 Various attempts to discourage dam building within culverts, 22 exemplary of which are the use of bright, moving streamers or the like, 23 have not proved successful.
24 Conventional culvert guards are available and comprise, in essence, a rigid wire screen secured over the culvert end. While such 26 protectors effectively prevent dam building within the culvert, they fail, 27 however, to deter the beavers From building the dam upon the screen face.
28 Such a dam must be subsequently removed in the manner previously referred 29 to.
~ll2'33l(~6;3 1 Perception of the need for a guard having rapid and inexpensive 2 clean-up capability, and a knowledge of beaver behavioral patterns have 3 been combined to provide the present device which while simple in concept, 4 is effective in use.
SUMMARY OF TOE INVENTION
6 In accordance with the present invention, there is provided a7 guard for placement over the upstream opening of a culvert. This guard 8 comprises a flexible grid which assumes a generally L-shaped configuration g when in use. Preferably the grid comprises transverse spaced apart steel rods welded to a pair of spaced apart, longitudinally extending steel chains. The upwardly extending section of the grid, which covers the 12 opening, functions to bar the beavers from entering the culvert to build the dam, and provides a base framework or lattice against which the beavers will construct the dam wall. The foot section of the grid ox-tends upstream some distance along the ground surface and provides a 16 movable substrate on which the dam wall will stand. The upstream end of the grid foot section has an elongate member or tail attached thereto 18 such as a length of steel chain, which can be pulled on, to partially 19 roll up the grid, thereby dislodging the mass supported by it. The backed-up water will then swiftly wash the packed earth out of the dislodged 21 wall, leaving a light, mainly wooden assemblage which can relatively 22 easily be rolled onto the roadway by continuing to pull on the tail chain.23 The guard is characterized by a number of advantages and 24 characteristics, namely:
(1) it does not normally interfere with the flow of water 26 through the culvert 27 (2) it is characterized by load-bearing capability so that it 28 can be used to dislodge and manipulate the dam mass 29 supported by it, to start the water flowing, which water then does most of the work in removing heavy components, 31 particularly the earth, that assist in making up the dam, slob 1 (3) the tail chain is readily accessible and a.car.or.truck 2 can be tied onito.itj to provide the pull needed to first 3 dislodge the.dam:.and then draw the grid onto the roadway 4 to recover the residue material;
(4) the grid is operative to-keep the beaver out of the 6 culvert;
7 (5) the beaver will start their construction immediately 8 against the grid, sup that the dam Hall ends up being 9 positioned on the foot section; and (6) because the guard can be very quickly cleaned, it is 11 feasible to use a frequent maintenance schedule, to avoid 12 permitting the beaver to build up the dam wall to a point 13 where it becomes difficult and time-consuming to break it 14 down.
DESCRIPTION OF THE DRAWINGS
16 Figure 1 is Kaplan view of the guard; and 17 Figure 2 is a perspective view of the guard in place over a 18 culvert opening.
19 DESCRIPTION OF.THE~PREFERRED EMBODIMENT
The guard 1 comprises a flexible grid 2 formed by welding 21 a plurality of transversely extending, spaced apart, steel rods 3 to a 22 pair of spaced apart, longitudinally extending steel chains 4.
23 The rods 3 are spaced apart about 4", to prevent a full-sized 24 beaver from squeezing there between.
1.231~b~3 l The chains 4 are~brought-~ogether at their upper ends and 2 joined to form a loop 5. This loop 5 may be secured to the culvert 6 3 by hanging it over the bent back upper lip 7 of the culvert. The 4 loop 5 therefore provides means, attached to the upper end of the grid 2, for Sacramento to the culvert or the roadway or the structure through 6 which the culvert extends, so that the grid may be positioned to extend 7 across the culvert opening I as required.
8 The chains 4 are also brought together at their lower ends 9 and a long tail chain 9 secured thereto.
The grid 2 is sufficiently wide, for example about 4" wider if than the diameter of the culvert, so that it will extend across the full 12 diameter of the culvert opening 8 and bear against the side edges of the 3 culvert 6. The length of the grid 2 is sufficient so that it will extend 4 along the ground surface lo in front of the culvert opening 8, perhaps three feet, to provide a foot section if which will underlie the dam (not shown.
16 In use! the grid's upper section 12 extends across the culvert 7 opening. The transverse rods 3 prevent the beavers from entering the 18 culvert 6 and building their dam therein. The beavers when barred in 19 this manner, normally use the grid upper section 12 as the dam wall frame and build against it. The grid foot section if thus underlies the dam.
21 When the dam is to be removed, the long tail chain 9, whose end is left 22 accessible on the bank of the stream, is attached to a vehicle on the 23 roadway. The vehicle can then be backed up and rocked to roll up the grid 24 2 to a limited extent. This loosens the dam mass and the backed up water seeps through. In short order, the flow becomes a turbulent stream and 26 the heavy earth in the dam is washed away, leaving a relatively light 27 assemblage of branches and the like. The vehicle can then be backed 28 up further to roll this debris onto the roadway.
29 The scope of the invention is defined by the following claims.
- 5 -
Claims (2)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A beaver guard for placement over the upstream opening of a drainage culvert extending across a roadway or other structure, comprising:
a plurality of vertically spaced apart, generally horizontal, substantially rigid rods;
at least two elongate, flexible members extending transversely of the rods and being connected thereto to form a cohesive,flexible grid;
the width of said grid being sufficient so that it extends across the opening and bears against the culvert wall, the length of said grid being sufficient so that it extends some distance along the ground in front of the opening;
said grid having means attached to its upper end for secure-ment to the culvert or the roadway or other structure, so that the grid may be positioned to extend across the opening as required;
said grid having an elongate, flexible second member attached to its lower end, said second member being of sufficient length so that, in use, its free end is accessible to be pulled on to roll up the grid to loosen and remove debris accumulated thereon.
a plurality of vertically spaced apart, generally horizontal, substantially rigid rods;
at least two elongate, flexible members extending transversely of the rods and being connected thereto to form a cohesive,flexible grid;
the width of said grid being sufficient so that it extends across the opening and bears against the culvert wall, the length of said grid being sufficient so that it extends some distance along the ground in front of the opening;
said grid having means attached to its upper end for secure-ment to the culvert or the roadway or other structure, so that the grid may be positioned to extend across the opening as required;
said grid having an elongate, flexible second member attached to its lower end, said second member being of sufficient length so that, in use, its free end is accessible to be pulled on to roll up the grid to loosen and remove debris accumulated thereon.
2. A beaver guard for placement over the upstream opening of a drainage culvert extending across a roadway, comprising:
a plurality of vertically spaced apart, generally horizontal, steel rods;
a plurality of lengths of steel chain extending transversely of the rods and being welded thereto to form a cohesive, flexible grid;
the width of said grid being sufficient so that is extends across the opening and bears against the culvert wall, the length of said grid being sufficient so that it extends some distance along the ground in front of the opening;
the spacing of the rods being sufficiently narrow so as to prevent the passage therebetween of a full grown beaver;
said grid having means at its upper end for securement to the culvert or the roadway, so that the grid may be positioned to extend across the opening as required;
said grid having a length of steel chain attached to its lower end, said chain being of sufficient length so that, in use, its free end is accessible to be pulled on from the roadway, to roll up the grid to loosen and remove debris accumulated thereon.
a plurality of vertically spaced apart, generally horizontal, steel rods;
a plurality of lengths of steel chain extending transversely of the rods and being welded thereto to form a cohesive, flexible grid;
the width of said grid being sufficient so that is extends across the opening and bears against the culvert wall, the length of said grid being sufficient so that it extends some distance along the ground in front of the opening;
the spacing of the rods being sufficiently narrow so as to prevent the passage therebetween of a full grown beaver;
said grid having means at its upper end for securement to the culvert or the roadway, so that the grid may be positioned to extend across the opening as required;
said grid having a length of steel chain attached to its lower end, said chain being of sufficient length so that, in use, its free end is accessible to be pulled on from the roadway, to roll up the grid to loosen and remove debris accumulated thereon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000454730A CA1231063A (en) | 1984-05-17 | 1984-05-17 | Beaver guard for drainage culvert |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000454730A CA1231063A (en) | 1984-05-17 | 1984-05-17 | Beaver guard for drainage culvert |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1231063A true CA1231063A (en) | 1988-01-05 |
Family
ID=4127901
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000454730A Expired CA1231063A (en) | 1984-05-17 | 1984-05-17 | Beaver guard for drainage culvert |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1231063A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110939065A (en) * | 2019-12-05 | 2020-03-31 | 中铁二十二局哈尔滨铁路建设集团有限责任公司 | Method for jacking bridge by using temporary steel support auxiliary frame |
-
1984
- 1984-05-17 CA CA000454730A patent/CA1231063A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110939065A (en) * | 2019-12-05 | 2020-03-31 | 中铁二十二局哈尔滨铁路建设集团有限责任公司 | Method for jacking bridge by using temporary steel support auxiliary frame |
| CN110939065B (en) * | 2019-12-05 | 2021-12-17 | 中铁二十二局哈尔滨铁路建设集团有限责任公司 | Method for jacking bridge by using temporary steel support auxiliary frame |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |