Patent Application
20230039574
This disclosure relates to a road anchoring system for use with traffic barriers and having a particular application for use with temporary construction barriers. Temporary construction barriers include both precast concrete and steel barriers. The traffic barrier is for controlling vehicles improperly diverging from a traffic lane or roadway lane. The anchoring system minimizes displacement of the barriers upon impact. The invention relates more specifically to a new method and apparatus for anchoring such barriers to the road surface.
The goal of the temporary construction barrier anchoring system is to prevent the barrier from falling off into the excavation and to protect the workers behind the barrier. Current traffic barriers may be anchor pinned to the surface by drilling vertical holes through precast ports in the barriers, beyond the asphalt or concrete road surface and into the sub grade in most applications. Conventional practice requires the drilling to be deep to be effective, so it is common to drill holes as deep as three feet into the ground. After drilling the long hole, a hydraulic hammer tool is required to drive a steel pin all the way in to secure the barrier to the ground. The anchor pins are installed on the traffic side of the barrier.
A primary disadvantage of the prior art deep hole pinning is that it is difficult to first drill a long pilot hole with a rock drill and then hammer the pins to that depth with an impact hammer. The three-foot depth requirement of conventional deep hole pinning normally requires rental of expensive excavator mounted impact hammers to accomplish insertion of the pin.
Another disadvantage of the prior art design is that deep hole pinning creates a path for water to get below the road surface. This can be particularly troublesome in northern climates where freezing temperatures cause expansion of subsurface water and frost heaving that can force the pins upward and can damage the road surface.
Another disadvantage of the prior art design is that deep hole pinning threatens subsurface utilities and requires surveys to show where the pinning is allowable or prohibited.
Another disadvantage of the prior art design is that conventional deep hole pinning fails to provide the best protection available to displacement of the barriers on impact, and thus safety for workers operating on the opposite side of the barriers.
Another disadvantage of the prior art design is that it is extremely difficult to remove the pins when it is time to remove and relocate the barriers.
Another disadvantage of the prior art design is that it relies upon the friction between the pin and the soil medium it engages for its resistance to removal. Variations in soil and moisture cause great variations in resistance to removal.
More recently, attempts have been made to utilize shorter rods and grooved rods by adding epoxy to the shorter holes drilled to compensate for the loss of friction from the deep drilled pins. These mid-length rods were typically 18 to 24 inches long. While reducing installation time, these systems continue to have some of the disadvantages known to deep hole pinning.
A primary disadvantage of the prior art mid-length anchors is that, as applied, they do not provide an improvement in safety of the anchoring system, including barrier displacement on impact, which is the essential purpose of the barrier anchoring system.
Another disadvantage of the prior art mid-length anchors is that it is difficult to accurately drill the holes vertically, resulting in variations in resistance to removal and thus inconsistent impact displacement results. Another disadvantage of the prior art mid-length anchors is that the inherent inconsistency in removal resistance requires a slightly deeper hole to be drilled to compensate for the variations.
Another disadvantage of the prior art mid-length anchors is that it remains ergonomically difficult to drill vertical holes proximate to the wall of the barriers. Another disadvantage of the prior art long and mid-length anchors is that when installed on a bridge deck, they penetrate the water sealed surface beneath the asphalt.
Thus, there remains a need for an anchoring system that overcomes these disadvantages and that provides an improved measure of safety by reducing deflections alongside excavations where workers are working.
A primary advantage of the various embodiments of the present invention is that they make installation of a barrier wall much easier, as it requires far less drilling and time to install. Another advantage of the disclosed embodiments is that it is unnecessary to engage rental equipment such as backhoes fitted with hydraulic hammers for the installation. Also, drilling at an angle to the barrier is easier than drilling vertically when the drill must be operated closer to the barrier.
Another advantage of the disclosed embodiments is that the epoxy around the anchor prevents creation of a subterranean path for water to get below the road surface and cause frost heaving when exposed to freezing temperatures.
Another advantage of the disclosed embodiments is that it eliminates the deep hole drilling that threatens subsurface utilities.
Another advantage of the disclosed embodiments is that it provides a controlled drilling angle for the pin which in turn provides a more predictable resistance to a more predictable resistance to movement of the barrier.
Another advantage of the disclosed embodiments is that upon impact, the angular disposition of the pin provides a greater resistance to retraction and displacement of the barriers on impact, and thus a greater measure of safety for workers operating on the opposite side of the barriers.
Another advantage of the disclosed embodiments is that upon impact, the insert behaves as a load transfer bushing between the barrier and the anchor to mitigate damage to the barrier. Another advantage of the disclosed embodiments is that it is easier to remove the pins when it is time to remove and relocate the barriers.
Another advantage of the disclosed embodiments is that it does not rely exclusively on the friction between the pin and the soil medium it engages for its resistance to removal. The epoxy penetrates permeable soil structure to produce a stronger and more consistent bond which reduces the variation in force required to remove the pin and thus increases the predictability of resistance to movement of the barrier.
Another advantage of the present invention is that it provides an opportunity for the use of short holes and pinning rods. Another advantage of the present invention is that it is compatible for use with existing barrier designs. Another advantage of the present invention is that when installed on a bridge deck, it does not penetrate the water sealed surface beneath the asphalt.
In summary, the disclosed invention provides a unique solution to the engineering constraints and challenges of providing an anchoring system for traffic barriers that is safe and economic to install and provides a greater resistance to displacement than known systems.
The advantages and features of the embodiments presently disclosed will become more readily understood from the following detailed description and appended claims when read in conjunction with the accompanying drawings in which like numerals represent like elements.
For all purposes of this disclosure, the following definitions are adopted. As used herein, the term “centerline” and “centerline 11” refers to a vertical plane that runs through the length of the barrier, and across which the barrier is symmetrical, such that the barrier is reversible and also usable between traffic traveling in opposite directions. The barrier vertical centerline provides a reference by which the relevant angles of other components may be indicated.
In one embodiment, a traffic barrier anchoring system is provided, having a traffic barrier comprising a top surface, a footer, and a wall extending inward and upward from the footer to the top surface. An anchor recess intersects the footer. In one embodiment, the anchor recess is rectilinear. A cylindrical footer port extends vertically through the footer beneath the anchor recess.
An insert is provided, comprising a head portion locatable in the anchor recess, and having a probe extending downward from the head portion that is locatable in the footer port. In one embodiment, the head portion is rectilinear for complimentary fit with a rectilinear anchor recess. An insert port extends through the head portion and the probe in angular relation to the footer port. A threaded rod extends through the insert port and the footer port to a predetermined subsurface depth of a road below the first traffic barrier. An adhesive adheres the threaded rod to the road. A threaded fastener connects to the threaded rod above the insert.
In another embodiment, the predetermined subsurface depth is eight inches or less. In another embodiment, the predetermined subsurface depth is between four and seven inches. In another embodiment, the predetermined subsurface depth is between three and four inches. In these new short-pinning embodiments, the pins are only between 9 and 14 inches long.
In another embodiment, the probe has a tapered cylindrical profile and is positioned in the footer port in interference fit.
In another embodiment, the probe further comprises a body portion that extends downward from the head portion in angular relation to the head portion, with the insert port centrally located in the body portion. A plurality of perimeter elements is located on a periphery of the body portion.
In another embodiment, the perimeter elements are ribs on the periphery of the body portion. In another embodiment, the ribs extend in horizontal rows angularly disposed to the body portion. In another embodiment, the ribs are located on the body portion in parallel relation to the head portion. In another embodiment, the ribs extend in vertical columns along the body portion.
In another embodiment, the ribs are located on the body portion in parallel relation to each other. In another embodiment, a slot extends between multiple rows, increasing flexibility during insertion and creating a path for extruded adhesive to flow without forcing the insert out of position.
In another embodiment, a peripheral diameter is defined by each row of ribs, with the peripheral diameter of at least one rib being greater than the diameter of the footer port. In another embodiment, the peripheral diameter of another rib is less than the diameter of the footer port to ease installation. In another embodiment, the ribs proximate to the head portion have a larger peripheral diameter than the ribs distal to the head portion.
In another embodiment, the insert port is concentric to the body portion. In another embodiment, the angle of the body portion to the head portion is between 6 and 11 degrees. In another embodiment, the angle of the body portion to the head portion is between 8 and 10 degrees. In another embodiment, the angle of the body portion to the head portion is 9 degrees. In another embodiment, the angle of the insert port to the footer port is 9 degrees.
In another embodiment, the head portion has a surface relief perpendicular to the body portion. In another embodiment, the head portion has an outer edge and an inner edge, and the inner edge is positioned closest to a centerline of the traffic barrier. In another embodiment, a direction indicator is located on the head portion.
In another embodiment, the adhesive is an epoxy. In another embodiment, the insert is made of a pliable material. In another embodiment, the insert is made of a ductile iron. In another embodiment, the insert is made of a high-density polyethylene. In another embodiment, insert 30 is comprised of a high-density polyethylene material having a modulus of elasticity of at least .9 MPa.
In another embodiment, the fastener has torque applied to place the threaded rod in tension and the footer in compression as against the road. Also disclosed is a method for anchoring a temporary barrier including the steps of:
The following description is presented to enable any person skilled in the art to make and use the invention and is provided in the context of a particular application and its requirements. Various modifications to the disclosed embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other embodiments and applications without departing from the spirit and scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown but is to be accorded the widest scope consistent with the principles and features disclosed herein.
It is known that the profiles of mobile traffic barriers 10 vary considerably and such differences are known to have significant impact on the performance of barriers 10. However, such profile differences are not understood to be relevant to the performance benefits of the present invention and thus the above description is intended to cover all precast concrete traffic barriers.
A rectilinear anchor recess 24 intersects wall 22. As best seen in
As best seen in
In the present illustration, there is a traffic side 4 to barrier 10. It is on traffic side 4 that barrier 10 is anchored to road 2. Insert 30 is positioned with a probe 42 inside footer port 16, and head portion 32 of insert 30 against anchor recess 24 above footer port 16. An insert port 64 extends through head portion 32 and probe 42 in angular relation to footer port 16 and inclined inward, towards barrier 10 centerline 11. A drill is inserted in insert port 64 to drill an anchor hole 8 in road 2 to a predetermined depth 6.
In one embodiment, the drilling of anchor hole 8 is accomplished with a hammer bit. This type of drilling significantly reduces the bit rotation speed and thus the heat generated at insert 30. As discussed further below, insert 30 may be made of a pliable material such as high-density polyethylene, and it is therefore desirable to limit the heat and shear forces imparted from the drill bit.
Insert port 64 is concentric to probe 42. Head portion 32 is perpendicular to footer port 16. In one embodiment, the angle of probe 42 to head portion 32 is between 8 and 10 degrees. In another embodiment, the angle of probe 42 to head portion 32 is approximately 9 degrees. As a result of the built-in angle of the insert port 64, anchor hole 8 is drilled at an angle of about 8 to 10 degrees from the vertical.
In one embodiment, anchor hole 8 is drilled to a predetermined depth 6 of eight inches or less. Upon removing the drill bit, an adhesive 72 is deposited into anchor hole 8, in an amount less than ⅓ of the volume of anchor hole 8. In another embodiment, anchor hole 8 is drilled to a predetermined depth 6 of between three and four inches.
A threaded rod 70 is placed in anchor hole 8 and adhesive 72 is allowed to cure, securing threaded rod 70 to road 2. A plate washer 80 (as shown in
As depicted in
In one embodiment, insert 30 is made of a strong but pliable material, such as a high-density polyethylene. In another embodiment, insert 30 is comprised of a high-density polyethylene material having a modulus of elasticity of at least .9 MPa. Such material is commercially available, such as API II HDPE 20 Melt manufactured by API IIlocated in Concord, Ohio.
One advantage to the use of insert 30 having the material properties identified is that insert 30 behaves as a load transfer bushing between barrier 10 and anchor 70. In this manner, it is desirable that insert 30 be pliable, and less brittle than barrier 10, which is normally precast concrete. By absorbing impact forces between barrier 10 and anchor 70 when barrier 10 is impacted, insert 30 mitigates damage to barrier 10. A relatively higher modulus of elasticity is associated with the ability of insert 30 to transfer barrier 10 collision impact forces in mitigation of damage to barrier 10.
In one embodiment, angle 66 is between 6 and 11 degrees. In another embodiment, angle 66 is between 8 and 10 degrees. In another embodiment, as shown, angle 66 is 9 degrees.
As also described in the description for
As also seen in this view, medium diameter ribs 56 are equal in diameter to port diameter 18 of footer port 16, such that medium diameter ribs 56 would be located in a slip fit of slight compression fit on insertion of insert 30 into footer port 16.
Finally, as also seen in this view, small diameter ribs 58 are smaller in diameter than port diameter 18 of footer port 16, such that small diameter ribs 58 would be located in a clearance fit relationship on insertion of insert 30 into footer port 16. This particular embodiment is provided to ease insertion of inserts 30 into footer ports 16 while maintaining the orientation of insert 30 to barrier 10 to initiate the proper drilling angle. Once drilling is initiated, the relationship between insert head 32 resting in anchor recess 24 and the unique angular relationship between insert body 48 and insert port 64 will resist rotation as the drill is rotated and forced downward.
Ribs 52 include a large diameter rib portion 54, a medium diameter rib portion 56, and a small diameter rib portion 58. The increasingly large ribs 52 provide tapered cylindrical profile to probe 42. In the embodiment illustrated, large ribs 54 have a profile diameter greater than footer port 16. Medium ribs 56 have a profile diameter approximately equal to footer port 16. Small ribs 58 have a profile diameter less than footer port 16. As illustrated, small ribs 58 are in clearance fit relationship with footer port 16. Medium ribs 56 are in slip fit relationship with footer port 16. Large ribs 54 are in interference fit with footer port 16 to help secure insert 30 in footer port 16.
As used herein, the term "substantially" is intended for construction as meaning “more so than not”. As used herein, the term "centerline" and “centerline 11” refers to a vertical plane that runs through the length of barrier 10, and across which barrier 10 is symmetrical. This allows barrier 10 to be reversible and also usable between traffic traveling in opposite directions.
Having thus described the present invention by reference to certain of its preferred embodiments, it is noted that the embodiments disclosed are illustrative rather than limiting in nature and that a wide range of variations, modifications, changes, and substitutions are contemplated in the foregoing disclosure and, in some instances, some features of the present invention may be employed without a corresponding use of the other features. Many such variations and modifications may be considered desirable by those skilled in the art based upon a review of the foregoing description of preferred embodiments. Accordingly, it is appropriate that the appended claims be construed broadly and, in a manner, consistent with the scope of the invention.
This application claims priority to U.S. Provisional Application 63/231,010 filed Aug. 9, 2021.
| Number | Date | Country | |
|---|---|---|---|
| 63231010 | Aug 2021 | US |
