IL284483A

IL284483A - Updated method for forming or enlarging roadway safety barrier with slip forming

Info

Publication number: IL284483A
Application number: IL284483A
Authority: IL
Inventors: Zorawsky Aharon
Original assignee: Zorawsky Aharon
Priority date: 2021-06-29
Filing date: 2021-06-29
Publication date: 2023-01-01
Also published as: IL284483B2

Description

Updated Method for Roadway Barrier Improvement Inventor: Aharon Zorawski FIELD AND BACKGROUND OF THE INVENTION The present invention relates to roadway barriers, and more particularly, to a method for increasing the height of a roadway barrier by slip forming.

BACKGROUND OF THE INVENTION Many modern highways and some roadways have median barriers. Fig. la illustrates a cross- sectional view of a highway pavement 12 and a concrete barrier 13. Barrier 13 has a plinth 3, a shoulder and a wall 7 as shown in Figure l a, designed so that when a wheel of a straying car rides up on plinth 3 and then onto shoulder 5, the wheel subsequently rides back down shoulder 5 and onto the pavement.

This effect of fending off straying cars is a crucial safety function of barrier 13.

As is well known, some conventional methods of resurfacing highways involve pouring a new layer of concrete or asphalt onto an existing roadway surface. In one of the conventional methods, barrier 13 rests on top of an old concrete or asphalt layer 11. After resurfacing with a new layer 15, barrier 13 becomes submerged to some extent, as in Figure lb, and the primary purpose thereof that is separating opposite traffic flows and fending off straying cars (as well as blocking light beams from oncoming traffic) is detrimentally affected. When yet another new layer 17 is poured, as in Figure lc, barrier 13 is further submerged into the pavement and consequently, the performance is even further reduced.

The problem of reduced effective height of a barrier wall also occurs in the case when the transverse slopes of highways are reversed. Fig. Id illustrates highway pavement 12, which is designed with inwardly-sloped road surfaces, so as to allow rainwater to run off into a central drainage pipe 20 1 through drains 19. As the experience of many highway management departments has shown, drains 19 often are clogged with debris, thereby creating flooding, which is a potent safety hazard. At the very least, the presence of water on the road causes traffic jams and slowdowns in fast lanes of otherwise high- speed highways. The common solution to this problem is to reverse the transverse slope of the highway, by pouring new layer 15. However, new layer submerges plinth 3 of barrier 13, drastically diminishing the performance of barrier 13.

A conventional method providing a limited solution to this problem is illustrated in Figures 2a-c.

Barrier 13, which is partially submerged into highway pavement 12 by new layer 15, is cut out of new layer 15 and out of old layer 11, approximately along a line 16, leaving a substantial cavity that is subsequently filled by a pavement filling 18, as shown in Fig. 2b. Barrier 13, along with broken pavement fragments, are transported to a waste disposal site. A new barrier 14 is positioned on top of filling 18 in the position previously occupied by barrier 13, as shown in Figure 2c.

Pavement fillings such as filling 18 are fundamentally detrimental to the integrity of highway pavement 12 in that surfaces of contact between old layer 11, new layer 15 and filling 18 react unevenly to drying, weather cycles, etc., and eventually lead to stress, cracking and premature deterioration.

Beside preserving the barrier functionality, however, the implementation of the method results in a cost- prohibitive and labor-intensive operation involving several types of road repairing machines, moving barrier by pieces, thus employing road workers for long hours per unit length of the barrier. The method, most of all, contributes to highway traffic jams, wastes enormous amounts of construction material, exacerbates the environmental problem by adding excessive amounts of concrete to waste disposal piles that are not recyclable, and is in itself a costly logistic operation.

Therefore, there is a need for a method of preserving divider barriers already in place without removing them, while raising barrier height to improve barrier efficacy. It would be of further advantage if such a method would reduce the time required for road repair, provide significant savings in construction 2 materials and costs associated with labor and logistics, and minimize the ecological impact by eliminating waste concrete.

SUMMARY OF THE INVENTION The present invention is a method of increasing a height of an existing roadway barrier on a roadway, the method including the steps of: (a) fitting a complete support structure over an exterior surface of the existing roadway barrier; (b) providing a slip-forming machine for producing both sides of a barrier addition in a single pass, the barrier addition being connected to, and raised with respect to, the existing roadway barrier; (c) providing a concrete mixture for use in conjunction with the slip- forming machine; (d) feeding the concrete mixture along the exterior surface of the existing roadway barrier; and (e) operating the slip-forming machine over the existing roadway barrier and the concrete mixture to produce in a single pass a new roadway barrier having a new concrete layer around the existing roadway barrier, such that the existing roadway barrier is incorporated within the new barrier, and the new barrier is raised with respect to the existing barrier.

According to one feature of the current invention, the slip-forming machine has a mold contoured to substantially match a contour of a road barrier.

According to another feature of the current invention, the support structure includes a metal support structure.

According to yet another feature of the current invention, the support structure is assembled from a material selected from the group consisting of wire, rod, and rebar, mesh, and lathe.

According to yet another feature of the current invention, the support structure is assembled from a material selected from the group consisting of natural fibers, synthetic fibers, recycled fibers and mixtures thereof. 3 According to yet another feature of the current invention, the method further includes applying a concrete vibrator to the concrete mixture during at least a portion of a setting period of the mixture.

According to yet another feature of the current invention, the concrete mixture includes a retarding agent.

According to yet another feature of the current invention, the concrete mixture includes a substance for improving concrete workability.

According to another aspect of the invention, there is provided a method for increasing a height of an existing roadway barrier on a roadway, the method includes the steps of: (a) providing a slip-forming machine for producing a complete barrier addition in a single pass, the barrier addition being connected to, and raised with respect to, the existing roadway barrier; (b) providing a concrete mixture for use in conjunction with the slip-forming machine; (c) feeding the concrete mixture along an exterior surface of the existing roadway barrier; and (d) operating the slip-forming machine over the existing roadway barrier and the concrete mixture to produce a new roadway barrier having a new concrete layer around the existing roadway barrier, such that the existing roadway barrier is incorporated within the new barrier, and the new barrier is raised with respect to the existing barrier.

According to one feature of the current invention, the concrete mixture includes a material selected from the group consisting of natural fibers, synthetic fibers, recycled fibers and mixtures thereof.

According to yet another feature of the current invention, the slip-forming machine has a mold contoured to substantially match a contour of a road barrier, such that the new roadway barrier has an external surface contour that substantially matches the contour of the road barrier. 4 BRIEF DESCRIPTION OF THE DRAWINGS The invention is herein described, by way of example only, with reference to the accompanying drawings. With specific reference now to the drawings in detail, it is stressed that the particulars shown are by way of example and for purposes of illustrative discussion of the preferred embodiments of the present invention only, and are presented in the cause of providing what is believed to be the most useful and readily understood description of the principles and conceptual aspects of the invention. In this regard, no attempt is made to show structural details of the invention in more detail than is necessary for a fundamental understanding of the invention, the description taken with the drawings making apparent to those skilled in the art how the several forms of the invention may be embodied in practice.

In the drawings: FIG. 1a is a cross-sectional view of a roadway and a barrier in the prior art thereon; FIG. 1b is a cross-sectional view of the barrier in the prior art partially submerged into a new pavement layer; FIG. 1c is a cross-sectional view of the barrier in the prior art further submerged into an additional new pavement layer; FIG. 1d is a cross-sectional view of the barrier in the prior art before reversal of a highway having transverse slopes; FIG. 1e is a cross-sectional view of the barrier in the prior art after reversal of the highway transverse slope; FIG. 2a is a cross-sectional view of the barrier, partially submerged into a new pavement layer; FIG. 2b is a cross-sectional view of the highway, after barrier removal and subsequent filling of the pavement hole, according to the teachings of the prior art; FIG. 2c is a cross-sectional view of a new barrier, repositioned on top of the filling of FIG. 2b, according to the method of the prior art; FIG. 3 is a perspective view of a raised barrier height according to one embodiment of the present invention; and FIG. 4 is a cross-sectional view of the barrier of FIG. 3; FIG. 5A is a cross-sectional view of a STEP-like mold and extruded barrier over an existing 2/6/22 barrier; FIG. 5B is a cross-sectional view of a STEP-like mold and extruded barrier; FIG. 6 is a cross-sectional view of an ONTARIO-like mold and extruded barrier over an existing barrier.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The principles and operation of the system in the invention according to the present invention may be better understood with reference to the drawings and the accompanying description.

Before explaining at least one embodiment of the invention in detail, it is to be understood that the invention is not limited in its application to the details of construction and the arrangement of the components set forth in the following description or illustrated in the drawing. The invention is capable of other embodiments or of being practiced or carried out in various ways. Also, it is to be understood that the phraseology and terminology employed herein is for the purpose of description and should not be regarded as limiting.

Referring now to the drawings, Figures 3 and 4 illustrate a prior art method of raising barrier 13 2/6/22 2/6/22 on an existing pavement layer 11. According to the method, after new layer 15 is poured, barrier 13 is partially submerged into new layer 15. A wire cage 25 composed of a wire 26 is placed over barrier 13.

Steel rods, rebar rods or any other metal rod product currently used in construction industry can also serve as the material for wire 26. Wire cage 25 is not connected to barrier 13 and therefore provides almost no structural support to the raised barrier. The main purpose of the wire cage is to provide support during the initial setting period such that the new concrete mixture retains form and does not run off or crack. Once the concrete is extruded by the slip-forming machine, it begins to settle as it dries and hardens. However, due to the fact that both sides of the barrier are open to the air, the concrete on the top of the barrier will start to settle at a run-off angle down each side of the barrier and a crack or opening will form in the center of concrete on the top of the barrier. To prevent this from happening, the wire cage is placed over the barrier prior to pouring the concrete. With the cage in place, the concrete clings to 6 the cage and no cracks open at the top. Once the concrete has hardened, there is no longer any need for the cage, but at this point it cannot be easily removed, so it is left in place.

It is noted that the cage is not connected to the existing cement barrier, but merely placed over barrier prior to extrusion of the cement. The cage or mesh is not needed to reinforce the cement. Its purpose and function is merely to cause the cement to cling to the wire while hardening. As such, the cage or wire mesh can be made up of thin rods of metal (e.g., having a diameter of 5mm).

After wire cage 25 has been disposed over and around existing barrier 13, a slip-forming machine extrudes a concrete mixture in a continuous forward movement over and along existing barrier 13 to form a barrier addition 32. The mold of the slip-forming machine is shaped on the upper side like the outer surface of barrier addition 32.

The height of barrier addition 32 with respect to the top surface of highway pavement 12 may be sufficiently high (preferably, at least 1 10 cm) to block light beams from oncoming traffic, in addition to the standard functions of the barrier.

According to another prior art embodiment , the raised barrier is constructed in the following 2/6/22 manner. Wire cage 25 is placed over old barrier 13, and a slip-forming machine extrudes barrier addition 32 prior to resurfacing operations on pavement 12, wherein new layer 15 is poured According to another embodiment of the present invention, vibrators can be used for improving the self-standing properties of the concrete mixture during the initial setting period. It is of further benefit to add retardants and substances for improved workability of the concrete.

The slip-forming machine used in conjunction with the inventive barrier-raising method can be one of many slip-forming machines known and used in the art, including the M-8100 and M-8800 models produced by Miller Formless Co., McHenry, IL, USA. 7 The instant system and method provide an improvement over the prior art method and system. 2/6/22 According to the instant method, a single-sided cement safety barrier is extruded by a slip-forming machine. The single-sided cement safety barrier (the term "one-sided barrier" and variations thereof are also used to refer to the same) is a barrier that has only one contoured side. The contoured side is the side of the barrier that has a protruding section abutting the pavement that is intended to distance the vehicle from the main body of the barrier as the wheels of the vehicle encounter the protruded section at a small distance from the body of the barrier.

Importantly, the width of the one-sided barrier can be changed. This change can be effected while the slip-forming machine is in action.

There are two general categories of one-sided barriers addressed herein. In the first category, 2/6/22 barrier is flush against a wall. In some cases, there is an existing one-sided safety barrier against the wall and in other cases there is no safety barrier. In the second category an existing one-sided barrier is added onto in order to provide a one-side cement safety barrier that is higher and wider than the original barrier.

The following example will help illustrate the one-sided barrier of the first category. Figure 5A depicts an example of a mold 100 and an extruded safety barrier 160 over an existing barrier. Figure 5B depicts and example of a mold 100 and an extruded safety barrier 160. The following description refers to both example options depicted in Figs. 5A and 5B as relevant. For example, any mention of the existing barrier is only reference to the example of Fig. 5A.

The one-sided cement safety barrier 160 is similar to the type of safety barrier known as a STEP safety barrier. In the example depicted in Fig. 5A, a roadside wall 50 is shown with a one-sided barrier 60 at the bottom of the wall 50. For certain reasons, the barrier 60 needs to be increased in width (for example, the lane adjacent the wall is converted into a public transport lane and the wing mirrors of the busses scrape against the wall).

Fig. 5B depicts an example where the instant method and system is used to form a completely new one-sided cement safety barrier 60 against a roadside wall 50, where no barrier previously existed.

The same steps and mold can be used, as detailed herein. 8 According to the instant method and system, a one-sided safety barrier mold 100 is designed and attached to the slip-forming machine (not shown). Cement is fed into the hopper or drum of the machine.

High intensity vibrators vibrate the cement, extruding the cement under great, one-sided pressure, into the mold. In the case of legacy, two-sided safety barriers, the vibrator pressure is equally applied to both sides of the barrier, cancelling out the vibration force. By contrast, in the new molds for one-sided safety barriers according to the instant invention, the force exerting is in one direction only, against the existing barrier and wall. To compensate for the rebound force exerted on the slip-forming machine, various changes have been made, including the addition of weights and redistribution of internal components of the machine. Onboard electrical and navigational systems also need adjustment, as discussed hereafter.

As mentioned above, the asymmetric nature of the slip-forming mold necessitates significant 2/6/22 modifications to the slip-forming machine to ensure that the vibrator forces do not cause the machine to deviate from the perfectly straight path parallel to the wall or at least the precisely equidistant path parallel to the existing barriers and/or wall. In embodiments, the slip-forming machine is a tracked vehicle (i.e., moving on tracks as opposed to wheels) which is guided by a laser hitting a string or cable which marks the predetermined path. In order for the vehicle to maintain a straight trajectory while being pushed away from the wall / existing barrier by the forces discussed above, it is necessary to modify the navigation system so that the vehicle is actually directed towards the wall, very slightly, and the repelling forces push the vehicle to travel precisely in a straight direction. The exact degree of compensation for the repelling forces is carefully calculated and electronically monitored in order to automatically autocorrect any minor deviation.

The concrete is tightly packed, thanks to the vibrators, and stays in form even after the machine moves on. The concrete does, however, settle as it dries and hardens but seeing as the mold 100 and resulting product 160 is only one-sided (the other side being the wall 50 and/or existing one-sided barrier 60), the concrete settles evenly. The cracking and seam-forming that occurs with full (symmetric) barriers does not occur with half (asymmetric) barriers. According to embodiments, the instant one-sided barrier is devoid of a wire cage, in contrast to the prior art barrier enhancement method and system discussed above. In the prior art system, the cage served an important function, namely, to prevent a seam or crack 9 forming in the center of the top of the barrier. The cage or wire mesh was not used for the purposes of reinforcing the concrete. In contrast to the prior art system, the instant system for forming asymmetric, one-sided cement barriers can be devoid of a wire mesh, where no structural reinforcement is needed.

Legacy slip-forming molds are pre-formed and have fixed dimensions. Molds have contoured sides and a flat top. The height and width of the mold cannot be adjusted to make the mold taller, shorter, wider or narrower.

By contrast, one of the very important features of the invention is that the molds according to embodiments of the instant system have an asymmetric design and are open on one of the sides that is usually closed in legacy molds. To further clarify, a mold has six sides: top, bottom, left, right, front, and back. The front and back (directions relative to the movement of the machine) sides are open, as is the bottom side (parallel to the surface). In legacy, symmetric molds, the right, left, and top sides are closed with panels.

An example of the present, innovative mold is disclosed here in further detail. Mold 100, 2/6/22 according to the instant embodiments, and in contrast to legacy molds, is devoid of a left side panel.

Accordingly mold 100 includes a right side, contoured panel 110 and a top panel 120. (The right-side left- side directionality used herein is relevant to countries where the vehicles drive on the right side of the road. In such countries the slip-forming machine is always on the right side of the mold and moves in the direction of traffic.) The roadside wall serves as a substitute for the missing left-hand side panel.

While in action / motion, a precise and very small distance (a few millimeters) is maintained between the open edge of the top side of the mold and the wall. On the one hand, the mold must not touch the wall as this can damage the mold and/or cause the machine to deviate from the path. On the other hand, the mold must be sufficiently close so that the wall serves as a replacement side for the mold, to maintain the desired shape of the extruded barrier.

Another very important feature is disclosed herein. The innovative feature allows for electively changing the width of the barrier. Extending the top panel 120 effectively widens the entire safety barrier.

In embodiments, the width of the top side panel 120 (may also be referred to as "section", "piece", "part", "surface", "wall’) of the mold is extendable or extensible. Extendable meaning that the top itself becomes wider and extensible meaning that the panel becomes wider by adding an extension. According to both general options, the width of the top side of the mold can be selectively enlarged.

Extension of the width of the top side can be achieved in many ways. According to one example embodiment, there is provided a flat plate 130 which lays parallel to, and in some cases abutting (or in very close proximity to), the top side panel 120 of the slip-forming mold 100. The plate may run along the entire length of the mold or only along a portion thereof. The plate can be moved in the direction of the open side of the mold when needed. Any applicable mechanical, electrical, electromechanical, hydraulic, and/or pneumatic mechanism can be used to control the movement of the plate. In the example embodiment depicted in Figs. 5A and 5B, one or more hydraulic mechanisms 140 control the movement of the plate 130.

Many other variations for extensible or extendable parts are envisioned. For example, the top 2/6/22 side may have an accordion design or folded flats that move from a vertical orientation to a horizontal orientation as the edge extends outwards. Many variations and modifications on or of the aforementioned would be obvious to one skilled in the art in view of the instant disclosure and are therefore included within the scope of the present invention.

Figure 6 is a cross-sectional view of an ONTARIO-like mold 200 and extruded barrier 270 over an existing barrier 70. The instant method and system can also be employed to widen and heighten existing, free-standing one-sided barriers, such as barrier 70, that are not against a wall (e.g., lining a roadway between a mountain-side drop-off, or a rail line). In such embodiments, a mold 200 is provided that includes a right-side, contoured panel 210, a top panel 220 and a partial left-side panel 250. The left-hand panel (see above why this is referred to as the left-hand side) extends vertically from the top side down to the top of the existing barrier (which is being enlarged and/or reinforced). In preferred embodiments, the length of the left panel is variable so as to be suitable for covering existing barriers of various sizes. To this end, the mold 200 includes plate of knife 230 that abuts or is attached to the left panel 250. The knife can be moved in the vertical direction either manually or automatically. In the example embodiment, hydraulic pistons 240 control the movement of the knife 250. In some embodiments, the top panel 220 may also include a horizontal knife / plate (not shown, but similar to plate 130) that can be employed to 11 electively change the width of the safety barrier. It is noted, that the enlargement of the existing barrier can even be carried out on a regular, two-sided roadway safety barrier.

In some embodiments, the left panel extends all the way down to the surface. According to this option, the slip-forming machine can extrude freestanding, asymmetric (one-sided) cement safety barriers.

With regards to the second category, one-sided barriers are structurally enhanced for increased 2/6/22 impact tolerance, the following example will help illustrate the issue. In one example, 30-year-old one- sided barriers (originally produced in a factory and shipped to the location of installation – to date, there are no one-sided / asymmetric barriers that are formed in place using a slip-forming machine), such as barrier 70, that serve as a continuous divider between a roadway and a rail line have a Containment Level H2 (High Containment). However, with the addition of rail lines over the years and changes to the rail line (e.g., the rail lines are closer to the roadway), it has been determined that the containment level of the barriers must be increased from H2 to H4 (very high containment). The H4 barrier referred to here is also known as an Ontario safety barrier. The instant method and system produces an Ontario-like barrier.

Instead of replacing the old barriers with new, higher rated, barriers, the instant method adds a layer of concrete over the existing barrier.

The additional concrete, adding both height and width to the existing barrier may be sufficient to increase the containment level. In some embodiments, it is required to structurally reinforce the barriers.

In such cases, rebars (reinforcement bars) are installed in the existing barriers at regular intervals down the sides of the barriers and across the tops of the barriers. For example, the rebars can be installed using chemical anchoring. With chemical anchoring, holes are drilled in the barriers and a resin is injected into the hole prior to insertion of the rebar. A rebar wire cage (with rebars that have a much greater diameter to the prior art wire cage 25) is placed over the existing barrier and affixed to the installed rebars with wire ties. This rebar cage increases the structural integrity of the enhanced barrier manyfold.

Preferably the slip-forming machine includes laser means for accurately measuring the distance to the existing barrier so as to automatically control its distance to the barrier so as to be able to accurate and rapidly form the new barrier. 12 Preferably, the system features suitable lighting, most preferably LED lighting, to enable the work to continue during the night, when roadway disruption is minimized, yet provide lighting which is comparable to daylight lighting conditions.

Although the invention has been described in conjunction with specific embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art.

Accordingly, it is intended to embrace all such alternatives, modifications and variations that fall within the spirit and broad scope of the appended claims. All publications, patents and patent applications mentioned in this specification are herein incorporated in their entirety by reference into the specification, to the same extent as if each individual publication, patent or patent application was specifically and individually indicated to be incorporated herein by reference. In addition, no citation or identification of any reference in this application shall be construed as an admission that such reference is available as prior art to the present invention. 13

Claims

CLAIMED IS:

1. A method of increasing a height and width of an existing cement roadway safety barrier on a roadway, the method comprising the steps of: 5 providing a slip-forming machine for producing a one-sided barrier addition, said one-sided barrier addition being connected to, and enlarged with respect to, the existing cement roadway safety barrier; providing a mold operationally coupled to the slip-forming machine, the mold having a traffic- facing panel and a top panel; 10 providing a concrete mixture for use in conjunction with said slip-forming machine; feeding said concrete mixture; and extruding the one-sided cement safety barrier from the mold with one-sided pressure against and along said exterior surface of the existing cement roadway safety barrier to produce a new one-sided cement roadway safety barrier having a new concrete layer around the existing roadway barrier, such that 15 the existing cement roadway safety barrier is incorporated within said new safety barrier, and said new safety barrier is enlarged with respect to the existing safety barrier.

2. The method of claim 1, wherein said slip-forming machine has a mold contoured to substantially match a contour of a traffic-facing side of the cement existing safety barrier, such that the new safety 20 barrier has a single contoured side that has a protruding section abutting the roadway that is intended to distance a vehicle from a main body of the new safety barrier as wheels of the vehicle encounter the protruded section at a small distance from the main body of the new safety barrier.

3. The method of claim 1, further comprising: 25 mechanically coupling a support structure to anchored rebars prior to the step of feeding said concrete mixture along said exterior surface of the existing roadway barrier, wherein said support structure includes a metal support structure. 14 September 20, 2022

4. The method of claim 3, wherein said support structure is assembled from a material selected from the group consisting of wire, rod, rebar, mesh, and lathe.

5. The method of claim 3, wherein said support structure is assembled from a material selected from 5 the group consisting of natural fibers, synthetic fibers, recycled fibers and mixtures thereof.

6. The method of claim 1, further comprising: applying at least one concrete vibrator to said concrete mixture during said step of feeding said concrete mixture along said exterior surface of the existing roadway barrier. 10

7. The method of claim 1, wherein said concrete mixture includes a retarding agent.

8. The method of claim 1, wherein said concrete mixture includes a substance for improving concrete workability. 15

9. The method of claim 2, wherein said existing roadside safety barrier abuts a wall having a height greater than that of the existing safety barrier, said concrete mixture being extruded at pressure against said wall and the existing safety barrier.

10. The method of claim 9, wherein said top panel is extendable or extensible, for varying the width of 20 the new barrier.

11. The method of claim 10, wherein a movable plate is operationally coupled to said top panel, said plate adapted to be moved manually or automatically while the slip-forming machine is in action.

12. The method of claim 2, wherein the mold includes a partial left-side panel.

13. The method of claim 12, wherein the left-side panel is extendible or extensible. 25

14. The method of claim 13, wherein a knife is operationally coupled to the left-side panel and adapted to extend vertically while the slip-forming machine is in action. 15 September 20, 2022

15. A method of extruding a one-sided roadside cement safety barrier on a pavement, the method for extruding the safety barrier comprising: providing a slip-forming machine for producing the one-sided cement safety barrier; providing a mold operationally coupled to the slip-forming machine, the mold having a traffic- 5 facing panel and a top panel; feeding a concrete mixture into the mold; extruding the one-sided cement safety barrier from the mold at pressure against a wall having a height greater than that of the mold such that the cement safety barrier has a single contoured side that has a protruding section abutting the pavement that is intended to distance a vehicle from a main body of 10 the safety barrier as wheels of the vehicle encounter the protruded section at a small distance from the main body of the cement safety barrier.

16. The method of claim 15, wherein said mold includes an extendable or extensible top panel, for varying the width of the new barrier. 15

17. The method of claim 16, wherein a movable plate is operationally coupled to said top panel, said plate adapted to be moved manually or automatically while the slip-forming machine is in action.

18. The method of claim 15, wherein the mold includes a partial left-side panel.

19. The method of claim 18, wherein the left-side panel is extendible or extensible.

20. The method of claim 19, wherein a knife is operationally coupled to the left-side panel and 20 adapted to extend vertically while the slip-forming machine is in action.

21. A method of extruding a one-sided cement roadway safety barrier on a pavement, the method for extruding the safety barrier comprising: providing a slip-forming machine for producing a one-sided cement safety barrier; providing a mold operationally coupled to the slip-forming machine, the mold having a traffic- 25 facing panel and a top panel, said top panel being extendable or extensible, for varying the width of the cement safety barrier while the slip-forming machine is in action; 16 September 20, 2022 feeding a concrete mixture into the mold; extruding the one-sided cement safety barrier from the mold at pressure against an existing safety barrier and/or a wall such that the cement safety barrier has a single contoured side that has a protruding section abutting the pavement that is intended to distance a vehicle from a main body of the 5 safety barrier as wheels of the vehicle encounter the protruded section at a small distance from the main body of the cement safety barrier. 17