Hydrodemolition device and hydrodemolition machine

Abstract

The present invention relates to a hydrodemolition device (1) comprising a lance (10) comprising a fluid line (20) for directing pressurized water, a drive unit (30) configured to rotate the lance (10) around a rotation axis (40), wherein the lance (10) further comprises a first section (11) connected to the rotor unit (30) the first section (11) comprising a first segment (21) of the fluid line (20), wherein the first segment (21) extends away from the rotation axis (40), a first nozzle (13) for ejecting pressurized water, the first nozzle (13) is connected to the first section (11), wherein the first nozzle (13) extends away from the rotation axis (40), wherein the first segment (21) and the first nozzle (13) extend away from the rotation axis (40) in different directions. The present invention also relates to an associate hydrodemolition machine (100) and use thereof.

Description

Technical field

[0001] The present invention relates generally to surface preparation for restoration of concrete roadbeds and specifically to a hydrodemolition device and a hydrodemolition machine for such purposes.Background art

[0002] Concrete roadbeds and bridge surfaces are subject to gradual degradation due to road salting practices, a common maintenance measure for ice control in winter conditions. Over time, road salts penetrate concrete surfaces, threatening the integrity of the steel reinforcement embedded within the concrete. To manage this deterioration and avoid the high costs associated with extensive structural damage, preventive replacement of the upper concrete layer has become a standard maintenance practice. By removing the surface layer and restoring the concrete before salt infiltration reaches the steel reinforcement, structural integrity can be preserved.

[0003] Concrete removal methods traditionally focus on eliminating all material surrounding the reinforcement bars, henceforth "rebar". However, complete removal around rebar-particularly underneath it-remains challenging, often leaving residual concrete that compromises the uniformity and bond of the new concrete layer. Hydrodemolition, a process that uses high-pressure water jets to selectively remove concrete while preserving rebar, offers improved control over traditional mechanical removal methods. Despite these advantages, known hydrodemolition devices often lacks precise depth control, sometimes resulting in uneven surfaces or incomplete removal under rebar, which complicates surface preparation for restoration.Summary of invention

[0004] It is therefore an object of the present disclosure to provide a hydrodemolition device and machine to mitigate, alleviate or eliminate one or more of the above-identified deficiencies and disadvantages.

[0005] This object is achieved by means of the subject matter of the independent claims of the present disclosure, wherein further aspects of the present disclosure are incorporated in the dependent claims.

[0006] According to a first aspect of the present disclosure, it is provided a hydrodemolition device comprising a lance comprising a fluid line for directing pressurized water, a drive unit configured to rotate the lance around a rotation axis, wherein the lance further comprises a first section connected to the drive unit the first section comprising a first segment of the fluid line, wherein the first segment extends away from the rotation axis, a first nozzle for ejecting pressurized water, the first nozzle is connected to the first section, wherein the first nozzle extends away from the rotation axis, wherein the first segment and the first nozzle extend away from the rotation axis in different directions.

[0007] By providing a segment the fluid line extending away from the rotation axis, a "whisking" motion is achieved during rotation is located. By further providing a first nozzle extending away from the rotation axis in a different direction compared to the first segment, the depth control of hydrodemolition device will be improved such that the hydrodemolition device can more effectively reach under rebar during operation in order to facilitate improved removal of material.

[0008] In various example embodiments the first segment may extend away at an angle of 15-25 degrees relative to the rotation axis.

[0009] The advantage of these embodiments is that an improved circumference of rotation of the lance in order to perform removal of material is achieved.

[0010] In various example embodiments, the angle may be 20 degrees.

[0011] The advantage of these embodiments is that a further improved circumference of rotation of the lance in order to perform removal of material is achieved.

[0012] In various example embodiments the first nozzle may extend away at an angle of 15-25 degrees relative to the rotation axis.

[0013] The advantage of these embodiments is that an advantageous trade-off between a horizontal and vertical component of the hydrojet in order facilitate further efficiency in removal of material under rebar is achieved

[0014] In various example embodiments the angle may be 20 degrees.

[0015] The advantage of these embodiments is that a further advantageous trade-off between a horizontal and vertical component of the hydrojet in order facilitate further efficiency in removal of material under rebar is achieved

[0016] In various example embodiments, the lance further may comprise a second section connecting the drive unit to the first section, wherein the second section comprises a second segment of the fluid line, wherein the second segment extends substantially perpendicularly to the rotation axis.

[0017] The advantage of these embodiments is that rotation of the lance may be actuated by the drive unit in an improved manner.

[0018] In various example embodiments the first section may be configured to extend in the same direction as the first segment and / or the second section is configured to extend in the same direction as the second segment.

[0019] The advantage of these embodiments is that a simplified design of the lance is achieved.

[0020] In various example embodiments, the hydrodemolition device may comprise a second nozzle connected to the second section, wherein the second nozzle extends away from the rotation axis, and wherein the first nozzle and the second nozzle extend away from the rotation axis in different directions.

[0021] The advantage of these embodiments is that the speed of material removal is further improved.

[0022] In various example embodiments the nozzle may be of a ceramic material.

[0023] The advantage of these embodiments is that the lifespan of the nozzle is increased.

[0024] In various example embodiments the hydrodemolition device may be configured for directing pressurized water of 100-300 MPa.

[0025] The advantage of these embodiments is that the efficiency of the hydrodemolition process is improved.

[0026] In a second aspect of the present disclosure, it is provided a hydrodemolition machine comprising the hydrodemolition device according to various example embodiments of the present disclosure, wherein the hydrodemolition device is arranged to a carriage, and wherein the hydrodemolition machine further comprises a guide member along which the carriage is movable in a substantially rectilinear path.

[0027] By providing a hydrodemolition machine comprising the hydrodemolition device, an effective arrangement for carrying out hydrodemolition at scale is achieved.

[0028] In various example embodiments the carriage may comprise a motor configured to move the carriage along the guide member.

[0029] The advantage of these embodiments is that the control of the hydrodemolition device during movement along the guide member is improved.

[0030] In a third aspect of the present disclosure, it is provided the use of a hydrodemolition machine according to various example embodiments, for material removing treatment of a concrete layer and / or surface preparation of a surface.

[0031] Further advantages with and features of the invention will be apparent from the following detailed description of preferred embodiments.Brief description of drawings

[0032] The invention is not limited only to the embodiments described above and shown in the drawings, which primarily have an illustrative and exemplifying purpose. This patent application is intended to cover all adjustments and variants of the preferred embodiments described herein; thus, the present invention is defined by the wording of the appended claims and the equivalents thereof. Thus, the devices, machines and uses thereof may be modified in all kinds of ways within the scope of the appended claims. Fig. 1 depicts an isometric view of a hydrodemolition device according to various example embodiments of the present disclosure. Fig. 2 depicts a first nozzle of a hydrodemolition device according to various example embodiments of the present disclosure. Fig. 3a depicts a front view of a hydrodemolition device according to various example embodiments of the present disclosure. Fig. 3a depicts a side view of a hydrodemolition device according to various example embodiments of the present disclosure. Fig. 4 depicts a hydrodemolition device arranged to a carriage according to various example embodiments of the present disclosure. Fig. 5 depicts a hydrodemolition device arranged to a guide member according to various example embodiments of the present disclosure. Fig. 6 depicts a hydrodemolition machine according to various example embodiments of the present disclosure. Description of embodiments

[0033] The invention is not limited only to the embodiments described above and shown in the drawings, which primarily have an illustrative and exemplifying purpose. This patent application is intended to cover all adjustments and variants of the preferred embodiments described herein; thus, the present invention is defined by the wording of the appended claims and the equivalents thereof. Thus, the apparatus and system may be modified in all kinds of ways within the scope of the appended claims.

[0034] Figure 1 depicts an isometric view of a hydrodemolition device 1 according to various example embodiments of the present disclosure. The hydrodemolition device 1 may comprise a lance 10 comprising a fluid line 20 for directing pressurized water. The lance 10, also known as a spray wand, may be connected to a fluid line 20. The fluid line 20, alternatively referred to as a supply hose, may direct pressurized water through the lance. Here, pressurized water could also be termed high-pressure water depending on the application. The hydrodemolition device 1 may further comprise a drive unit 30 configured to rotate the lance 10 around a rotation axis 40. In other words, the drive unit 30, which may be a motor, actuator, or the like, and may facilitate rotational movement of the lance 10. Examples of suitable motors may include stepper motors, hydraulic motors, or electric motors, or the like.

[0035] The lance 10 may further comprise a first section 11 connected to the rotor unit 30 the first section 11 comprising a first segment 21 of the fluid line 20, wherein the first segment 21 may extend away from the rotation axis 40. In other words, the first segment 21 may extend in a direction offset or from the rotation axis 40. The offset may be referred to as a radial offset or radial extension. It should be appreciated that the wording "connected to the rotor unit 30" is to be interpreted broadly. As seen in figure 1, an indirect connection of the first section 11 to the rotor unit 30 is accomplished via a second section 12. However, in various example embodiments, the first section 11 may be directly connected to the rotor unit 30.

[0036] The lance may further comprise a first nozzle 13 for ejecting pressurized water. The first nozzle 13 may comprise a nozzle holder, a support washer, a seal and a nozzle nut. The first nozzle 13 may be connected to the first section 11. The first nozzle 13 may extend away from the rotation axis 40. The meaning of the first nozzle 13 extending away from the rotation axis 40 is to be interpreted in a similar vein to the first section 11 extending away from the rotation axis 40, as explained above. However, as seen in figure, the first segment 21 and the first nozzle 13 may extend away from the rotation axis 40 in different directions. As an example of this, an angle C depicted in figure 1. The angle C depicts an example of relative extensions of the first section 11 and the first nozzle 13 away from the rotation axis 40 different in such a way that an angle for 90-180 degrees along a vector in 3D is created. In this example, a rotation of the lance 10 around the rotation axis 40 will enable what is a "whisk" or oscillation of the hydrojet around a pre-determined circumference due to the first section 11 extending away from the rotation axis 40. In various example embodiments, said first section 11 extending away from the rotation axis 40 configures a pre-determined circumference of 70-80 mm, but this depends on a length of the first section 11 extending away from the rotation axis 40, and various alternatives are possible. It should also be appreciated, various alternatives to achieve that the first section 11 and the first nozzle 13 extend away in different directions are possible.

[0037] The first nozzle 13 may be of a ceramic material, such as alumina, zirconia, or silicon carbide. Alternatively, it may be made from a wear-resistant material such as tungsten carbide, stainless steel, or boron carbide. In various example embodiments where further nozzles are present, these nozzles may be of a ceramic material. It is appreciated different nozzles may be made of different materials.

[0038] As also depicted in figure 1, in various example embodiments, the lance 10 may further comprise a second section 12 connecting the rotor unit 30 to the first section 11, wherein the second section 12 may comprise a second segment 22 of the fluid line 20. As depicted in figure 1, the second segment 22 may extend substantially perpendicularly to the rotation axis 40. In various example embodiments, the first section 11 may be configured to extend in the same direction as the first segment 21. In various example embodiments the second section 12 may be configured to extend in the same direction as the second segment 22. In other words, the first and second sections 11, 12 of the lance 10 comprising the fluid line 20 may extend in the same as the first and second segments 21, 22 of the fluid line 20 comprised within the lance 10.

[0039] In various example embodiments, the hydrodemolition device 1 may configured for directing pressurized water of 100-300 MPa. The pressurized water, which could also be referred to as water under high pressure or ultra-high-pressure water, may be generated using pumps such as piston pumps, plunger pumps, or diaphragm pumps capable of achieving the required pressure range.

[0040] Turning now to figure 2, a lance 10 of a hydrodemolition device 1 according to various example embodiments of the present disclosure is depicted. In other words, figure 2 may depict a closed-up view of a lance 10 of a hydrodemolition device 1 as depicted in figure 1. In figure 2, it is depicted an example in which a first segment 21 of a first section 11 of a lance 10 of a hydrodemolition device 1 is depicted as extending away at an angle A relative to a rotation axis 40. In various example embodiments, the angle A may be 15-25 degrees, e.g. 20 degrees. It is appreciated different angles A may alter a pre-determined circumference of a so called oscillation or "whisk" of the hydrojet as already described. A larger angle A may consequently lead to a larger pre-determined circumference, or in other words a larger surface is acted upon during normal operation of the hydrodemolition device. As further seen in figure 2, a nozzle 13 of the hydrodemolition device 1 is depicted as extending away at an angle B relative to a rotation axis 40. In various example embodiments, the angle B may be 15-25 degrees, e.g., 20 degrees. It is appreciated different angles B may alter what can be referred to as an "angle of attack" of the nozzle 13 such that components of force of which the hydrodemolition device 1 ejects pressurized water onto a surface during normal operation are altered. For example, a larger angle B, in other words larger "angle of attack", may result in a larger component of the hydrojet acting in a relative horizontal direction, whereas a smaller angle B results in the reverse. As such, by adjustment of the angles A and B, the hydrodemolition device may be adjusted for various situations while achieving excellent capabilities in removing material from under rebar.

[0041] Alternatively, or additionally, a first segment 21 and a first nozzle 13 extending away from the rotation axis 40 in different directions may be described in relation to a horizontal axis 41 orthogonal to the rotation axis 40. This is depicted in figure 3a and 3b. As seen, the first segment 21 may be offset from the first nozzle 13, in other words the first segment 21 and the first nozzle 13 may be separated along a horizontal axis 41 by a pre-determined horizontal distance. Upon rotation of the hydrodemolition device 1 around the rotation axis 40, a pre-determined circumference may therefore be achieved based on the horizonal distance. Further, in figure 3b, it can be seen that from another perspective, of the hydrodemolition device 1 in figure 3a, that the first nozzle 13 may extend away from the rotation axis 40 in order to achieve an "attack angle" similarly to what has been explained above. It is therefore understood if angles A and B are used to denote the relative extensions away from the rotation axis 40 of the first segment 21 and the first nozzle 13, respectively, then it follows that these angles A and B may be viewed from different views, i.e. in different cartesian planes. It is also appreciated that the wording front view and side view here are merely informational and could be denoted vice versa.

[0042] Turning now to figure 4, a hydrodemolition machine 100 according to various example embodiments of the present disclosure is depicted. The hydrodemolition device 1 may be arranged to a carriage 102, and wherein the hydrodemolition machine 100 further comprises a guide member 103 along which the carriage 102 is movable in a substantially rectilinear path. In other words, the guide member 103, also known as a rail, track, or guiding beam, may provide a path for the carriage 102 to move about.

[0043] Turning now to figure 5, a hydrodemolition device 1 arranged to a carriage 102 according to various example embodiments of the present disclosure is depicted. The carriage 102 may comprise a motor 104 configured to move the carriage along the guide member 103. In other words, the motor 104, also known as a drive motor, actuator, or linear motor, may provide a tractional force to drive the carriage 102 along the guide member 103. Suitable motor types may include stepper motors, DC motors, or servo motors, to move the carriage 102 along the rectilinear path.

[0044] Turning now to figure 6, a hydrodemolition device 1 arranged to a guide member 103 according to various example embodiments of the present disclosure is depicted.

[0045] In various example embodiments, the hydrodemolition device 1 may comprise comprises a second nozzle (not shown) connected to the second section 12, wherein the second nozzle extends away from the rotation axis 40, and wherein the first nozzle 13 and the second nozzle extend away from the rotation axis 40 in different directions. Further nozzles may be possible, as long as the extension away differs from the first section 11.

[0046] In various example embodiments, the use of the hydrodemolition machine 100 described herein may be for material removing treatment of a concrete layer and / or surface preparation of a surface. Potential applications of the hydrodemolition machine 100 extend beyond standard concrete removal and surface preparation, including but not limited to, infrastructure maintenance projects such as bridge deck and parking structure restoration, highway resurfacing, and airport runway repair, where precision removal of deteriorated concrete is essential to maintain structural integrity without damaging underlying reinforcement. Additionally, hydrodemolition may be applied in the removal of hazardous coatings, such as lead-based paints or contaminated layers, from industrial surfaces, where the water-based process reduces dust and particle emissions.

[0047] Various examples have been described. These and other examples are within the scope of the following claims.

Examples

Embodiment Construction

[0033]The invention is not limited only to the embodiments described above and shown in the drawings, which primarily have an illustrative and exemplifying purpose. This patent application is intended to cover all adjustments and variants of the preferred embodiments described herein; thus, the present invention is defined by the wording of the appended claims and the equivalents thereof. Thus, the apparatus and system may be modified in all kinds of ways within the scope of the appended claims.

[0034]Figure 1 depicts an isometric view of a hydrodemolition device 1 according to various example embodiments of the present disclosure. The hydrodemolition device 1 may comprise a lance 10 comprising a fluid line 20 for directing pressurized water. The lance 10, also known as a spray wand, may be connected to a fluid line 20. The fluid line 20, alternatively referred to as a supply hose, may direct pressurized water through the lance. Here, pressurized water could also be termed high-press...

Technical field

[0001] The present invention relates generally to surface preparation for restoration of concrete roadbeds and specifically to a hydrodemolition device and a hydrodemolition machine for such purposes.Background art

[0002] Concrete roadbeds and bridge surfaces are subject to gradual degradation due to road salting practices, a common maintenance measure for ice control in winter conditions. Over time, road salts penetrate concrete surfaces, threatening the integrity of the steel reinforcement embedded within the concrete. To manage this deterioration and avoid the high costs associated with extensive structural damage, preventive replacement of the upper concrete layer has become a standard maintenance practice. By removing the surface layer and restoring the concrete before salt infiltration reaches the steel reinforcement, structural integrity can be preserved.

[0003] Concrete removal methods traditionally focus on eliminating all material surrounding the reinforcement bars, henceforth "rebar". However, complete removal around rebar-particularly underneath it-remains challenging, often leaving residual concrete that compromises the uniformity and bond of the new concrete layer. Hydrodemolition, a process that uses high-pressure water jets to selectively remove concrete while preserving rebar, offers improved control over traditional mechanical removal methods. Despite these advantages, known hydrodemolition devices often lacks precise depth control, sometimes resulting in uneven surfaces or incomplete removal under rebar, which complicates surface preparation for restoration.Summary of invention

[0004] It is therefore an object of the present disclosure to provide a hydrodemolition device and machine to mitigate, alleviate or eliminate one or more of the above-identified deficiencies and disadvantages.

[0005] This object is achieved by means of the subject matter of the independent claims of the present disclosure, wherein further aspects of the present disclosure are incorporated in the dependent claims.

[0006] According to a first aspect of the present disclosure, it is provided a hydrodemolition device comprising a lance comprising a fluid line for directing pressurized water, a drive unit configured to rotate the lance around a rotation axis, wherein the lance further comprises a first section connected to the drive unit the first section comprising a first segment of the fluid line, wherein the first segment extends away from the rotation axis, a first nozzle for ejecting pressurized water, the first nozzle is connected to the first section, wherein the first nozzle extends away from the rotation axis, wherein the first segment and the first nozzle extend away from the rotation axis in different directions.

[0007] By providing a segment the fluid line extending away from the rotation axis, a "whisking" motion is achieved during rotation is located. By further providing a first nozzle extending away from the rotation axis in a different direction compared to the first segment, the depth control of hydrodemolition device will be improved such that the hydrodemolition device can more effectively reach under rebar during operation in order to facilitate improved removal of material.

[0008] In various example embodiments the first segment may extend away at an angle of 15-25 degrees relative to the rotation axis.

[0009] The advantage of these embodiments is that an improved circumference of rotation of the lance in order to perform removal of material is achieved.

[0010] In various example embodiments, the angle may be 20 degrees.

[0011] The advantage of these embodiments is that a further improved circumference of rotation of the lance in order to perform removal of material is achieved.

[0012] In various example embodiments the first nozzle may extend away at an angle of 15-25 degrees relative to the rotation axis.

[0013] The advantage of these embodiments is that an advantageous trade-off between a horizontal and vertical component of the hydrojet in order facilitate further efficiency in removal of material under rebar is achieved

[0014] In various example embodiments the angle may be 20 degrees.

[0015] The advantage of these embodiments is that a further advantageous trade-off between a horizontal and vertical component of the hydrojet in order facilitate further efficiency in removal of material under rebar is achieved

[0016] In various example embodiments, the lance further may comprise a second section connecting the drive unit to the first section, wherein the second section comprises a second segment of the fluid line, wherein the second segment extends substantially perpendicularly to the rotation axis.

[0017] The advantage of these embodiments is that rotation of the lance may be actuated by the drive unit in an improved manner.

[0018] In various example embodiments the first section may be configured to extend in the same direction as the first segment and / or the second section is configured to extend in the same direction as the second segment.

[0019] The advantage of these embodiments is that a simplified design of the lance is achieved.

[0020] In various example embodiments, the hydrodemolition device may comprise a second nozzle connected to the second section, wherein the second nozzle extends away from the rotation axis, and wherein the first nozzle and the second nozzle extend away from the rotation axis in different directions.

[0021] The advantage of these embodiments is that the speed of material removal is further improved.

[0022] In various example embodiments the nozzle may be of a ceramic material.

[0023] The advantage of these embodiments is that the lifespan of the nozzle is increased.

[0024] In various example embodiments the hydrodemolition device may be configured for directing pressurized water of 100-300 MPa.

[0025] The advantage of these embodiments is that the efficiency of the hydrodemolition process is improved.

[0026] In a second aspect of the present disclosure, it is provided a hydrodemolition machine comprising the hydrodemolition device according to various example embodiments of the present disclosure, wherein the hydrodemolition device is arranged to a carriage, and wherein the hydrodemolition machine further comprises a guide member along which the carriage is movable in a substantially rectilinear path.

[0027] By providing a hydrodemolition machine comprising the hydrodemolition device, an effective arrangement for carrying out hydrodemolition at scale is achieved.

[0028] In various example embodiments the carriage may comprise a motor configured to move the carriage along the guide member.

[0029] The advantage of these embodiments is that the control of the hydrodemolition device during movement along the guide member is improved.

[0030] In a third aspect of the present disclosure, it is provided the use of a hydrodemolition machine according to various example embodiments, for material removing treatment of a concrete layer and / or surface preparation of a surface.

[0031] Further advantages with and features of the invention will be apparent from the following detailed description of preferred embodiments.Brief description of drawings

[0032] The invention is not limited only to the embodiments described above and shown in the drawings, which primarily have an illustrative and exemplifying purpose. This patent application is intended to cover all adjustments and variants of the preferred embodiments described herein; thus, the present invention is defined by the wording of the appended claims and the equivalents thereof. Thus, the devices, machines and uses thereof may be modified in all kinds of ways within the scope of the appended claims. Fig. 1 depicts an isometric view of a hydrodemolition device according to various example embodiments of the present disclosure. Fig. 2 depicts a first nozzle of a hydrodemolition device according to various example embodiments of the present disclosure. Fig. 3a depicts a front view of a hydrodemolition device according to various example embodiments of the present disclosure. Fig. 3a depicts a side view of a hydrodemolition device according to various example embodiments of the present disclosure. Fig. 4 depicts a hydrodemolition device arranged to a carriage according to various example embodiments of the present disclosure. Fig. 5 depicts a hydrodemolition device arranged to a guide member according to various example embodiments of the present disclosure. Fig. 6 depicts a hydrodemolition machine according to various example embodiments of the present disclosure. Description of embodiments

[0033] The invention is not limited only to the embodiments described above and shown in the drawings, which primarily have an illustrative and exemplifying purpose. This patent application is intended to cover all adjustments and variants of the preferred embodiments described herein; thus, the present invention is defined by the wording of the appended claims and the equivalents thereof. Thus, the apparatus and system may be modified in all kinds of ways within the scope of the appended claims.

[0034] Figure 1 depicts an isometric view of a hydrodemolition device 1 according to various example embodiments of the present disclosure. The hydrodemolition device 1 may comprise a lance 10 comprising a fluid line 20 for directing pressurized water. The lance 10, also known as a spray wand, may be connected to a fluid line 20. The fluid line 20, alternatively referred to as a supply hose, may direct pressurized water through the lance. Here, pressurized water could also be termed high-pressure water depending on the application. The hydrodemolition device 1 may further comprise a drive unit 30 configured to rotate the lance 10 around a rotation axis 40. In other words, the drive unit 30, which may be a motor, actuator, or the like, and may facilitate rotational movement of the lance 10. Examples of suitable motors may include stepper motors, hydraulic motors, or electric motors, or the like.

[0035] The lance 10 may further comprise a first section 11 connected to the rotor unit 30 the first section 11 comprising a first segment 21 of the fluid line 20, wherein the first segment 21 may extend away from the rotation axis 40. In other words, the first segment 21 may extend in a direction offset or from the rotation axis 40. The offset may be referred to as a radial offset or radial extension. It should be appreciated that the wording "connected to the rotor unit 30" is to be interpreted broadly. As seen in figure 1, an indirect connection of the first section 11 to the rotor unit 30 is accomplished via a second section 12. However, in various example embodiments, the first section 11 may be directly connected to the rotor unit 30.

[0036] The lance may further comprise a first nozzle 13 for ejecting pressurized water. The first nozzle 13 may comprise a nozzle holder, a support washer, a seal and a nozzle nut. The first nozzle 13 may be connected to the first section 11. The first nozzle 13 may extend away from the rotation axis 40. The meaning of the first nozzle 13 extending away from the rotation axis 40 is to be interpreted in a similar vein to the first section 11 extending away from the rotation axis 40, as explained above. However, as seen in figure, the first segment 21 and the first nozzle 13 may extend away from the rotation axis 40 in different directions. As an example of this, an angle C depicted in figure 1. The angle C depicts an example of relative extensions of the first section 11 and the first nozzle 13 away from the rotation axis 40 different in such a way that an angle for 90-180 degrees along a vector in 3D is created. In this example, a rotation of the lance 10 around the rotation axis 40 will enable what is a "whisk" or oscillation of the hydrojet around a pre-determined circumference due to the first section 11 extending away from the rotation axis 40. In various example embodiments, said first section 11 extending away from the rotation axis 40 configures a pre-determined circumference of 70-80 mm, but this depends on a length of the first section 11 extending away from the rotation axis 40, and various alternatives are possible. It should also be appreciated, various alternatives to achieve that the first section 11 and the first nozzle 13 extend away in different directions are possible.

[0037] The first nozzle 13 may be of a ceramic material, such as alumina, zirconia, or silicon carbide. Alternatively, it may be made from a wear-resistant material such as tungsten carbide, stainless steel, or boron carbide. In various example embodiments where further nozzles are present, these nozzles may be of a ceramic material. It is appreciated different nozzles may be made of different materials.

[0038] As also depicted in figure 1, in various example embodiments, the lance 10 may further comprise a second section 12 connecting the rotor unit 30 to the first section 11, wherein the second section 12 may comprise a second segment 22 of the fluid line 20. As depicted in figure 1, the second segment 22 may extend substantially perpendicularly to the rotation axis 40. In various example embodiments, the first section 11 may be configured to extend in the same direction as the first segment 21. In various example embodiments the second section 12 may be configured to extend in the same direction as the second segment 22. In other words, the first and second sections 11, 12 of the lance 10 comprising the fluid line 20 may extend in the same as the first and second segments 21, 22 of the fluid line 20 comprised within the lance 10.

[0039] In various example embodiments, the hydrodemolition device 1 may configured for directing pressurized water of 100-300 MPa. The pressurized water, which could also be referred to as water under high pressure or ultra-high-pressure water, may be generated using pumps such as piston pumps, plunger pumps, or diaphragm pumps capable of achieving the required pressure range.

[0040] Turning now to figure 2, a lance 10 of a hydrodemolition device 1 according to various example embodiments of the present disclosure is depicted. In other words, figure 2 may depict a closed-up view of a lance 10 of a hydrodemolition device 1 as depicted in figure 1. In figure 2, it is depicted an example in which a first segment 21 of a first section 11 of a lance 10 of a hydrodemolition device 1 is depicted as extending away at an angle A relative to a rotation axis 40. In various example embodiments, the angle A may be 15-25 degrees, e.g. 20 degrees. It is appreciated different angles A may alter a pre-determined circumference of a so called oscillation or "whisk" of the hydrojet as already described. A larger angle A may consequently lead to a larger pre-determined circumference, or in other words a larger surface is acted upon during normal operation of the hydrodemolition device. As further seen in figure 2, a nozzle 13 of the hydrodemolition device 1 is depicted as extending away at an angle B relative to a rotation axis 40. In various example embodiments, the angle B may be 15-25 degrees, e.g., 20 degrees. It is appreciated different angles B may alter what can be referred to as an "angle of attack" of the nozzle 13 such that components of force of which the hydrodemolition device 1 ejects pressurized water onto a surface during normal operation are altered. For example, a larger angle B, in other words larger "angle of attack", may result in a larger component of the hydrojet acting in a relative horizontal direction, whereas a smaller angle B results in the reverse. As such, by adjustment of the angles A and B, the hydrodemolition device may be adjusted for various situations while achieving excellent capabilities in removing material from under rebar.

[0041] Alternatively, or additionally, a first segment 21 and a first nozzle 13 extending away from the rotation axis 40 in different directions may be described in relation to a horizontal axis 41 orthogonal to the rotation axis 40. This is depicted in figure 3a and 3b. As seen, the first segment 21 may be offset from the first nozzle 13, in other words the first segment 21 and the first nozzle 13 may be separated along a horizontal axis 41 by a pre-determined horizontal distance. Upon rotation of the hydrodemolition device 1 around the rotation axis 40, a pre-determined circumference may therefore be achieved based on the horizonal distance. Further, in figure 3b, it can be seen that from another perspective, of the hydrodemolition device 1 in figure 3a, that the first nozzle 13 may extend away from the rotation axis 40 in order to achieve an "attack angle" similarly to what has been explained above. It is therefore understood if angles A and B are used to denote the relative extensions away from the rotation axis 40 of the first segment 21 and the first nozzle 13, respectively, then it follows that these angles A and B may be viewed from different views, i.e. in different cartesian planes. It is also appreciated that the wording front view and side view here are merely informational and could be denoted vice versa.

[0042] Turning now to figure 4, a hydrodemolition machine 100 according to various example embodiments of the present disclosure is depicted. The hydrodemolition device 1 may be arranged to a carriage 102, and wherein the hydrodemolition machine 100 further comprises a guide member 103 along which the carriage 102 is movable in a substantially rectilinear path. In other words, the guide member 103, also known as a rail, track, or guiding beam, may provide a path for the carriage 102 to move about.

[0043] Turning now to figure 5, a hydrodemolition device 1 arranged to a carriage 102 according to various example embodiments of the present disclosure is depicted. The carriage 102 may comprise a motor 104 configured to move the carriage along the guide member 103. In other words, the motor 104, also known as a drive motor, actuator, or linear motor, may provide a tractional force to drive the carriage 102 along the guide member 103. Suitable motor types may include stepper motors, DC motors, or servo motors, to move the carriage 102 along the rectilinear path.

[0044] Turning now to figure 6, a hydrodemolition device 1 arranged to a guide member 103 according to various example embodiments of the present disclosure is depicted.

[0045] In various example embodiments, the hydrodemolition device 1 may comprise comprises a second nozzle (not shown) connected to the second section 12, wherein the second nozzle extends away from the rotation axis 40, and wherein the first nozzle 13 and the second nozzle extend away from the rotation axis 40 in different directions. Further nozzles may be possible, as long as the extension away differs from the first section 11.

[0046] In various example embodiments, the use of the hydrodemolition machine 100 described herein may be for material removing treatment of a concrete layer and / or surface preparation of a surface. Potential applications of the hydrodemolition machine 100 extend beyond standard concrete removal and surface preparation, including but not limited to, infrastructure maintenance projects such as bridge deck and parking structure restoration, highway resurfacing, and airport runway repair, where precision removal of deteriorated concrete is essential to maintain structural integrity without damaging underlying reinforcement. Additionally, hydrodemolition may be applied in the removal of hazardous coatings, such as lead-based paints or contaminated layers, from industrial surfaces, where the water-based process reduces dust and particle emissions.

[0047] Various examples have been described. These and other examples are within the scope of the following claims.

Examples

Embodiment Construction

[0033]The invention is not limited only to the embodiments described above and shown in the drawings, which primarily have an illustrative and exemplifying purpose. This patent application is intended to cover all adjustments and variants of the preferred embodiments described herein; thus, the present invention is defined by the wording of the appended claims and the equivalents thereof. Thus, the apparatus and system may be modified in all kinds of ways within the scope of the appended claims.

[0034]Figure 1 depicts an isometric view of a hydrodemolition device 1 according to various example embodiments of the present disclosure. The hydrodemolition device 1 may comprise a lance 10 comprising a fluid line 20 for directing pressurized water. The lance 10, also known as a spray wand, may be connected to a fluid line 20. The fluid line 20, alternatively referred to as a supply hose, may direct pressurized water through the lance. Here, pressurized water could also be termed high-press...

Claims

1. A hydrodemolition device (1) comprising: - a lance (10) comprising a fluid line (20) for directing pressurized water, - a drive unit (30) configured to rotate the lance (10) around a rotation axis (40), - wherein the lance (10) further comprises: ∘ a first section (11) connected to the rotor unit (30) the first section (11) comprising a first segment (21) of the fluid line (20), wherein the first segment (21) extends away from the rotation axis (40), ∘ a first nozzle (13) for ejecting pressurized water, the first nozzle (13) is connected to the first section (11), wherein the first nozzle (13) extends away from the rotation axis (40), wherein the first segment (21) and the first nozzle (13) extend away from the rotation axis (40) in different directions.

2. The hydrodemolition device (1) according to claim 1, wherein the first segment (21) extends away at an angle (A) of 15-25 degrees relative to the rotation axis (40).

3. The hydrodemolition device (1) according to claim 2, wherein the angle (A) is 20 degrees.

4. The hydrodemolition device (1) according to any one of claims 1-3, wherein the first nozzle (13) extends away at an angle (B) of 15-25 degrees relative to the rotation axis (40).

5. The hydrodemolition device (1) according to claim 4, wherein the angle (B) is 20 degrees.

6. The hydrodemolition device (1) according to any one of the preceding claims, wherein the lance (10) further comprises a second section (12) connecting the rotor unit (30) to the first section (11), wherein the second section (12) comprises a second segment (22) of the fluid line (20), wherein the second segment (22) extends substantially perpendicularly to the rotation axis (40).

7. The hydrodemolition device (1) according to claim 6, wherein the first section (11) is configured to extend in the same direction as the first segment (21) and / or the second section (12) is configured to extend in the same direction as the second segment (22).

8. The hydrodemolition device (1) according to any one of the preceding claims, wherein the hydrodemolition device (1) comprises a second nozzle connected to the second section (12), wherein the second nozzle extends away from the rotation axis (40), and wherein the first nozzle (13) and the second nozzle extend away from the rotation axis (40) in different directions.

9. The hydrodemolition device (1) according to any one of the preceding claims, wherein the first nozzle (13) is of a ceramic material.

10. The hydrodemolition device (1) according to any one of the preceding claims, wherein the hydrodemolition device (1) is configured for directing pressurized water of 100-300 MPa.

11. A hydrodemolition machine (100) comprising a hydrodemolition device (1) according to claims 1-10, wherein the hydrodemolition device (1) is arranged to a carriage (102), and wherein the hydrodemolition machine (100) further comprises a guide member (103) along which the carriage (102) is movable in a substantially rectilinear path.

12. The hydrodemolition machine (100) according to claim 11, wherein the carriage (102) comprises a motor (104) configured to move the carriage along the guide member (103).

13. Use of a hydrodemolition machine (100) according to claim 11 or 12 for material removing treatment of a concrete layer and / or surface preparation of a surface.

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