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Patent Searching and Data


Title:
CULVERT HEADWALL AND METHOD
Document Type and Number:
WIPO Patent Application WO/2019/178684
Kind Code:
A1
Abstract:
The present invention is directed to headwall for culvert and method of installation thereof to reduce the manufacturing and installation costs of the headwall. In a preferred embodiment the headwall comprises a core structure attached to a pipe connector and to a nozzle in which the fluid coming from the pipe connector passes through it. The components of the headwall are preferably made in light weight material such as plastic to reduce the overall weight of the headwall and facilitate its installation.

Inventors:
BOUCHARD, Hubert (40 rue des Muguets, C.P. 13Gore, Québec J0V 1K0, J0V 1K0, CA)
Application Number:
CA2019/050336
Publication Date:
September 26, 2019
Filing Date:
March 19, 2019
Export Citation:
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Assignee:
BOUCHARD, Hubert (40 rue des Muguets, C.P. 13Gore, Québec J0V 1K0, J0V 1K0, CA)
International Classes:
E01F5/00
Foreign References:
US6474907B22002-11-05
US6533498B12003-03-18
Attorney, Agent or Firm:
BROUILLETTE LEGAL INC. (1 Beaver Hall Hill, Montreal, Québec H2Z 0A5, H2Z 0A5, CA)
Download PDF:
Claims:
Claims

1) A prefabricated headwall to connect to a culvert pipe comprising:

a) a headwall core comprising:

i) a back wall;

ii) a sloped front wall;

iii) a bottom wall;

iv) a pair of upwardly side walls being substantially symmetrical with respect to the aperture and joining the back wall, the bottom wall and the sloped front wall;

b) a passageway extending from the back wall to the sloped front wall;

c) pipe connector means disposed on the back wall extremity of the passageway;

wherein the passageway and the pipe connector stub together define a flow channel.

2) The headwall according to claim 1), further comprising a headwall nozzle being attached to the sloped front wall extremity of the passageway, wherein the passageway, the pipe connector stub and the headwall nozzle together define the flow channel.

3) The headwall according to claim 2), wherein the headwall nozzle and the pipe connector means each comprise a threaded portion being adapted to be connected to passageway.

4) The headwall according to claim 2), wherein the pipe connector means are cylindrical with an inner diameter and an outer diameter, and the outer diameter is greater than the diameter of the aperture.

5) The headwall according to claim 4), wherein the pipe connector means are adapted to be locked to the culvert pipe. 6) The headwall according to claim 4), wherein the pipe connector means comprise a flange adapted to mate with the back wall.

7) The headwall according to claim 2), wherein the headwall nozzle is cylindrical with an inner diameter and an outer diameter, and the outer diameter is the same as the diameter of the aperture.

8) The headwall according to claim 2), wherein the headwall nozzle comprises a sloped cut-out portion forming edges.

9) The headwall according to claim 2), wherein the passageway, the headwall nozzle, and the pipe connector means are coaxial.

10) The headwall according to claim 1), wherein the headwall core has an empty interior.

11) The headwall according to claim 10), wherein the headwall core further comprises an opening adapted to introduce a material into the empty interior.

12) The headwall according to claim 11), wherein the material, wherein the material is selected from one of foam, expanded polystyrene beads, sand, gravel, concrete, glass beads or water.

13) The headwall according to claim 2), wherein the sloped front wall and the headwall nozzle are integrated together.

14) The headwall according to claim 2), wherein the sloped front wall, the pipe connector means and the passageway are integrated together.

15) A prefabricated headwall to connect to a culvert pipe comprising a generally“U” shaped bottom portion and a top portion which is complementary to said bottom portion, the top portion and the bottom portion defining a passageway extending horizontally from a front wall to a rear wall and further defining a pipe connection means disposed near said rear wall.

16) A method of installation of a headwall to a culvert pipe, comprising:

a) digging a ditch being configured to be complementary to a bottom wall and side walls of a headwall core; b) installing said headwall core in said ditch;

c) installing said pipe through an aperture in a back wall of the core.

17) The method according to claim 16), further comprising the installation of a headwall nozzle to the headwall core through an aperture in a front wall of the core.

18) The method according to claim 16), further comprising adding some material into the headwall core interior to keep the headwall core in place.

19) The method according to claim 18), wherein the material is selected from one of sand, gravel, concrete, glass beads or water.

20) The method according to claim 16), wherein the method of installing the pipe connector comprises the pipe connector being screwed into the core.

* * *

Description:
Title of the Invention

Culvert headwall and method

Cross-Reference to Related Applications

[0001] There are no cross-related applications. Field of the Invention

[0002] The present invention generally relates to culverts, and more particularly to an apparatus and a method for connecting a culvert headwall to a drain in the field of infrastructure management systems.

Background of the Invention

[0003] Headwalls are often used with standard culvert or drainage pipes in infrastructure water management systems especially when the pipe diameter is large. Such structures are generally made in concrete, steel or other heavy materials which make them difficult to transport and install. Many need to be actually built on site. It is understandable that such headwall configurations and their installation are time consuming and expensive.

[0004] A need exists for a lighter and cheaper headwall especially (but not exclusively) for use with smaller diameter culverts such as those used under residential driveways.

[0005] A solution to this problem has been proposed by Gary A. Fish, in the United States patent 6,394,700 by using a plastic apron end wall which is connected to a drain which extends under a highway. Such design aims to provide a plastic aproned end wall which resists movements due to buoyancy forces and provide also a light apron end wall made in plastic. Those characteristics provide a device which is much less subject to damage by heavy equipment during transportation and installation of the structure.

[0006] Generally, the headwalls are made in heavy materials mainly in concrete that does not facilitate the transportation neither the installation due to the relatively heavy weight of such headwalls. Summary of the Invention

[0007] The aforesaid and other objectives of the present invention are realized by generally providing a relatively light and rigid headwall which can be easily mounted to a drain. [0008] In another aspect and advantage of the present invention is to provide a headwall which is comparatively inexpensive in relation to the commonly used headwalls.

[0009] Other and further aspect and advantage of the present invention, is to provide an efficient installation method that can reduce the installation time and costs in comparison to the commonly used methods.

[0010] Other and further aspect of the present invention, is to provide a headwall made in preferably recyclable material such as recyclable plastic.

[0011] Other and further aspects and advantages of the present invention will be obvious upon an understanding of the illustrative embodiments about to be described or will be indicated in the appended claims, and various advantages not referred to herein will occur to one skilled in the art upon employment of the invention in practice.

Brief Description of the Drawings

[0012] The above and other aspects, features and advantages of the invention will become more readily apparent from the following description, reference being made to the accompanying drawings in which:

[0013] Figure 1 is a top plan view of a headwall made in accordance with the invention.

[0014] Figure 2 is a top front perspective view of the headwall shown in Fig. 1.

[0015] Figure 3 is a top rear perspective view of the headwall shown in Fig. 1.

[0016] Figure 4 is a rear view of the headwall shown in Fig. 1.

[0017] Figure 5 is a front view of the headwall shown in Fig. 1.

[0018] Figure 6 is a side view of the headwall shown in Fig. 1.

[0019] Figure 7 is a side sectional view of the headwall shown in Fig. 5 taken along section line A-A. [0020] Figure 8 is a side sectional view of the nozzle portion shown in Fig. 1 and 5 taken along section line A-A.

[0021] Figure 9 is a plan section view of a pipe connector stub portion shown in Fig. 1 and 5 taken along section line A-A. [0022] Figure 10 is a plan section view of the headwall core shown in Fig. 1 and 5 taken along section line A-A.

[0023] Figure 11 is a top front perspective view of another embodiment of a headwall in accordance with the invention.

[0024] Figure 12 is a partial section of the top portion of the core of figures 24, 27, 31 and 33 showing a pair of channels and a portion of the corrugations of a first type of culvert pipe;

[0025] Figure 13 is a partial section of the top portion of the core of figures 24, 27, 31 and 33 showing a pair of channels and a portion of the corrugations of a second type of culvert pipe;

[0026] Figure 14 is a partial section of the top portion of the core of figures 24, 27, 31 and 33 showing a pair of channels and a portion of the corrugations of a first type of culvert pipe superposed on a second type of culvert pipe to insure the channels will be able to receive both types of culvert pipes;

[0027] Figure 15 is a plan section view of the headwall shown in Fig. 1 mounted in a ditch taken along section line A-A.

[0028] Figure 16 is a front view of the headwall shown in Fig. 1 mounted in a ditch.

[0029] Figure 17 is a top front perspective view of the headwall shown in Fig. 1 mounted in a ditch.

[0030] Figure 18 is an example of a plan section view of the headwall shown in Fig. 1 with clamps taken along section line A-A.

[0031] Figure 19 is an example of a side view of the headwall shown in Fig. 1 with clamps. [0032] Figure 20 is an example of a portion of a plan section view of the headwall shown in Fig. 1 with clamps.

[0033] Figure 21 is an example of a side section view of the nozzle shown in Fig. 1 taken along section line A-A. [0034] Figure 22 is an example of a side section of a pipe connector stub shown in Figs.

18, 19 and 20 taken along a section line A-A.

[0035] Figure 23 is an example of a side section view of a clamp bracket shown in Figs. 18, 19 and 20 taken along a section line A-A.

[0036] Figure 24 is a front perspective view of another embodiment of the headwall made of plastic by assembling a series of thermoformed sheets together also showing the culvert pipe;

[0037] Figure 25 is a front exploded perspective view of the headwall shown in figure 24;

[0038] Figure 26 is a rear perspective view of the headwall shown in figure 24;

[0039] Figure 27 is a rear exploded perspective view of the headwall shown in figure 24;

[0040] Figure 28 is a top perspective view of the top front portion of the of the headwall of figure 24 made of a thermoformed plastic sheet;

[0041] Figure 29 is a top perspective view of the lower front portion of the headwall of figure 24 made of a thermoformed plastic sheet;

[0042] Figure 30 is a top perspective view of the upper portion and lower portion of figures 28 and 29 when assembled together;

[0043] Figure 31 is a top perspective of the top rear portion of the headwall of figure 24 made of a thermoformed plastic sheet;

[0044] Figure 32 is a top perspective of the lower rear portion of the headwall of figure 24 made of a thermoformed plastic sheet;

[0045] Figure 33 is a top perspective view of the upper portion and lower portion of figures 31 and 32 when assembled together. Detailed Description of the Preferred Embodiment

[0046] A novel culvert headwall will be described hereinafter. Although the invention is described in terms of specific illustrative embodiments, it is to be understood that the embodiments described herein are by way of example only and that the scope of the invention is not intended to be limited thereby.

[0047] The headwall as shown in Fig. 1 is indicated as reference numeral 100 comprises a headwall nozzle 2, a pipe connector stub 3 which are attached to a headwall core 1 and a known plastic or metal pipe 4 which when attached to the pipe connector stub 3.

[0048] Now referring to Figure 2 to 10, a preferred embodiment of the headwall 100 is illustrated. The headwall 100 comprise a headwall core 1. It may comprise a top wall 12 which may be provide with chamfered end corners 18 substantially symmetrical one to the other with respect to a vertical center plan (the plane is define by the vertical section plan A-A in Fig. 5), a substantially flat bottom wall 13 which sits on the ground when mounted, a front wall 16, a sloped front wall 10 configured to avoid obstruction of the headwall nozzle 2 due to soil erosion or the like, a back wall 11 and two upwardly flared side walls 14 substantially symmetrical with respect to the vertical section plan A-A which allow the headwall core 1 to sit tight on the sloped soil and the flat ground portion when mounted.

[0049] The headwall core 1 comprises an aperture 15 which extends from the substantially flat back wall 11 to the front wall 16 passing through the sloped front wall 10

[0050] The pipe connector stub 3 may be cylindrical with an inner diameter 37 and an outer diameter 34. The outer diameter 34 preferably greater than the diameter of the aperture 15. One end of the pipe connector stub 3 is attachable to the core 1 such as with a thread or other means. The other end is adapted to receive a pipe 4 and preferably lock it in place using any mean known in the art.

[0051] In a preferred embodiment the back wall 11 mates with a flange 30 of the pipe connector stub 3 once it is attached to the core 1. [0052] The headwall nozzle 2 is preferably cylindrical with an inner diameter 27 and an outer diameter 24. The outer diameter 24 of the nozzle portion is substantially the same as the diameter of the aperture 15.

[0053] The headwall nozzle portion 2 may comprise a sloped cut-out portion forming edges 20, 21 and 22. Edges 20 and 22 being generally parallel to the sloped wall 10 of the core 1 and edge 21 being generally parallel to the bottom wall 13 of the core 1.

[0054] The headwall core 1, the headwall nozzle 2 and the pipe connector stub 3 may be constructed in light but relatively strong material such as plastic in order to reduce the weight of the structure.

[0055] The length of the aperture 15 is substantially greater than the length of the threaded portion of the headwall nozzle portion 2 and the treaded portion of the pipe connector stub 3.

[0056] The threaded portion of the headwall nozzle 2 portion is preferably screwed inside the headwall core 1 through the aperture 15.

[0057] The diameter of the aperture 15 is substantially same than the outer diameter 24 and 34 respectively of the headwall nozzle 2 and the pipe connector stub 3.

[0058] In a preferred embodiment the aperture 15 is threaded as indicated by reference 19, the threads 19 mate with threads 25 and 35 respectively in the headwall nozzle 2 and the pipe connector stub 3.

[0059] In a preferred embodiment the longitudinal axes respectively of the aperture 15 in the headwall core 1, the headwall nozzle 2 and of the pipe connector stub 3 are substantially coaxial.

[0060] In a preferred embodiment the headwall nozzle 2 and the pipe connector stub 3 threaded portions are screwed in the headwall core 1 to mate at the contact line 50 which corresponds to the position of the pipe connector stub 3 edge when the flange 30 mates with the back wall 11.

[0061] In another embodiment not shown in the Figures, the headwall nozzle 2 and the pipe connector stub 3 are unitary. [0062] In another embodiment as shown in Figure 11 the headwall core 111 is preferably made of plastic by blow moulding, or a series of thermoforming sheets assembled together (see figures 12-14 and 24-33) or other known method to produce an outer shell with an empty interior. In such embodiment an aperture 110 is made preferably on a top wall 112 to fill the headwall core 111 with light but rigid foam or polystyrene expanded beads at the time of manufacture or with sand, gravel, concrete, glass beads, water or other similar material on site once the headwall core is installed in a ditch 200.

[0063] Now referring to Figs. 15 to 17, a preferred embodiment of the headwall 100 is shown installed in the ditch 200.

[0064] Now referring to Figs. 18 to 23, wherein an example of the headwall 100 is shown with a pipe 400 fitted in a connector stub 301 and locked in place with a bracket clamp 302 surrounded with least one clamp 201.

[0065] To install the culvert headwall, the following method may be used:

[0066] a) the ditch 200 is dug having a configuration which is complementary to the bottom wall 13 and the sloped side walls 14 of the core 1;

[0067] b) the connector stub 3 is screwed (or attached using other known means) into the core 1 through aperture 15 in the rear wall 11 of the core 1 until the flange 30 mates with the back wall 11.

[0068] c) the rear wall 34 of the stub 3 is fitted over the pipe 4 and preferably locked in place using known means,

[0069] d) the front nozzle 2 is screwed (or attached using other known means) into the core 1 through aperture 15 in the front walls 10 and 16 of the core 1 preferably until the rear of the nozzle 2 mates with the front of the stub 3,

[0070] e) if the core is of the type that has an empty interior, foam, sand, glass beads or another known filler is introduced into the core via opening 110,

[0071] f) the open space remaining at the rear of the core 1 is filled preferably with gravel or other known material until it reaches the desired level. [0072] Figures 24 to 33 show another embodiment of the invention in which thermoforming is used to manufacture the headwall. In this example, the corrugated culvert pipe is attached to the lower portion of the core before the top portion is attached to the lower portion. The configuration of the channel(s) in the back of the lower portion generally correspond to the corrugations in the culvert pipe. In figures 24, 27, 31 and 33, only one such channel is shown, while two parallel channels and the pipe corrugations are partly shown in figures 12 to 14.

[0073] While illustrative and presently preferred embodiments of the invention have been described in detail hereinabove, it is to be understood that the inventive concepts may be otherwise variously embodied and employed and that the appended claims are intended to be construed to include such variations except insofar as limited by the prior art.