A device for demolishing expansion joints by energy accumulation

Abstract

The application discloses a device for demolishing expansion joints by energy accumulation and progress, and relates to the technical field of municipal engineering, which comprises energy accumulation and progress micro-blasting devices, a plurality of the energy accumulation and progress micro-blasting devices are symmetrically placed at equal intervals on the upper surface of steel fiber reinforced concrete, and the plurality of energy accumulation and progress micro-blasting devices are located on both sides of the expansion joint, the steel fiber reinforced concrete fixed with the expansion joint is simultaneously demolished by blasting of the plurality of energy accumulation and progress micro-blasting devices, and a blasting safety protection device is covered above the steel fiber reinforced concrete. The device can quickly and effectively improve the demolition efficiency of the anchoring concrete of the bridge expansion joint, shorten the construction period, and further ensure the safety of the main body of the bridge. Through the blasting safety protection device, the safety of the adjacent personnel and passing vehicles in the construction process is ensured, and the device can also adsorb smoke and harmful gases, thereby meeting the requirements of safe and civilized construction.

Description

Technical Field

[0001] This invention relates to the field of municipal engineering technology, and in particular to a device for dismantling expansion joints by focusing energy. Background Technology

[0002] With the large-scale development of highway bridge construction, expansion joints have been widely used to meet the needs of bridge longitudinal, lateral, and vertical displacement and rotation caused by temperature changes, hurricanes, vehicle loads, earthquakes, and other conditions. As a structural protection product that bears the largest dynamic load in highway bridges, expansion joints not only withstand complex dynamic loads or impacts of varying magnitudes, but also must endure fatigue, wear, and various chemical and physical corrosions.

[0003] Currently, most bridge expansion joints are quite damaged, with a large proportion requiring urgent maintenance or even replacement. This necessitates the complete removal of existing bridge expansion joints for replacement. Conventional methods for removing in-service highway bridge expansion joints typically involve mechanically removing the anchoring reinforced concrete on both sides of the joint. However, mechanical construction is time-consuming and inefficient, severely impacting highway traffic flow and even potentially causing traffic accidents.

[0004] Developing a device for rapidly dismantling expansion joints using energy-concentrating technology, quickly breaking up concrete to shorten the construction cycle, reducing the harmful effects of blasting, and ensuring the safety of the bridge structure and surrounding personnel has become a technical challenge that urgently needs to be addressed by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a device for dismantling expansion joints by focusing energy and advancing it, thereby solving the problems listed in the background art.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] The present invention discloses a device for dismantling expansion joints by shaped charge, comprising a shaped charge micro-blasting device, wherein multiple shaped charge micro-blasting devices are symmetrically placed at equal intervals on the upper surface of steel fiber reinforced concrete, and the multiple shaped charge micro-blasting devices are located on both sides of the expansion joint. The multiple shaped charge micro-blasting devices simultaneously blast and dismantle the steel fiber reinforced concrete that fixes the expansion joint, and the multiple shaped charge micro-blasting devices are covered with a blasting safety protection device.

[0008] Preferably, the shaped charge follow-up micro-blasting device includes a downstream charge, a connector, a upstream charge, a fuse, a downstream shaped charge liner, a housing, and a upstream shaped charge liner. The upstream shaped charge liner is installed on the bottom inner wall of the housing. The upstream shaped charge liner is filled with the upstream shaped charge. The top of the upstream shaped charge liner communicates with the lower surface of the connector. The upper surface of the connector communicates with the lower surface of the downstream shaped charge liner. The downstream shaped charge liner is filled with the downstream shaped charge. The fuse is installed on the upper surface of the downstream shaped charge liner.

[0009] Preferably, the pre-stage propellant shroud is conical, and the outer peripheral surface of the pre-stage propellant shroud abuts against the inner wall of the housing. The rear-stage propellant shroud is formed by two frustums joined together, and the volume of the pre-stage propellant shroud is larger than the volume of the rear-stage propellant shroud.

[0010] Preferably, the fuse integrates a safety module, an energy module, a control module, and an output module. The safety module is limited by mechanical locking or volume interference. The energy module uses a built-in battery or an external power supply. The control module receives signal commands via Bluetooth or Wi-Fi. The output module consists of a detonation sequence, and the output module is first connected to the pre-charge and then to the post-charge. Both the control module and the output module are electrically connected to the energy module.

[0011] Preferably, the blasting safety protection device includes a cover shell, handles are installed on both sides of the upper surface of the shell, a suction and filter device is connected to the upper surface of the shell and the suction and filter device is located between the two handles, square through holes are opened on two opposite side walls of the shell, a moving device is provided on the other two opposite side walls of the shell, and the lower surface of the shell is set as an opening.

[0012] It also includes flame-retardant sound-absorbing cotton, a frame, and a wire mesh. The flame-retardant sound-absorbing cotton is evenly coated on the inner wall of the outer shell, and the flame-retardant sound-absorbing cotton with a telescopic function is provided at the square through hole. The wire mesh is welded on the frame. The external volume of the frame is smaller than the internal cavity of the outer shell. The outer shell covers the frame, and the bottom of the frame is connected to the bottom of the inner side of the outer shell.

[0013] Preferably, the filtration device includes an air filter box, an adsorption tube, and a negative pressure fan. The air filter box contains multiple air filter elements, the adsorption tube contains activated carbon, the air inlet of the air filter box is flexibly connected to the outer shell, the air outlet of the air filter box is flexibly connected to the air inlet of the adsorption tube, the air outlet of the adsorption tube is flexibly connected to the negative pressure fan, and the negative pressure fan is flexibly mounted on the upper surface of the outer shell via foot pads.

[0014] Preferably, the moving device includes a connecting rod, a hydraulic rod, and a caster wheel. One end of the connecting rod passes through the housing and is welded to the frame. The other end of the connecting rod is connected to the fixed end of the hydraulic rod. The caster wheel is movably mounted on the working end of the hydraulic rod and has a locking mechanism.

[0015] Preferably, the frame is made of angle iron welded together, and the wire mesh has a pore size of 3-5mm.

[0016] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0017] 1) The front-stage shaped charge hood is conical, and the rear-stage shaped charge hood is formed by splicing together the cross sections of two frustums. Through the boundary protection technology of conical and annular focused jet penetrating reinforced concrete medium, it is ensured that during the implementation process, damage to the broken parts can be prevented, while the stability of the foundations such as the adjacent abutment and back wall can be guaranteed.

[0018] 2) The installation of blasting safety protection devices controls the orientation of the air-facing surface through frames and wire mesh, thereby controlling the direction of the flying rocks; and absorbs blasting noise through flame-retardant sound-absorbing cotton, and adsorbs blasting smoke and harmful gases through a filter device, thus achieving the purpose of safety protection, dust removal and noise reduction.

[0019] In summary, this invention can quickly and effectively improve the efficiency of removing the concrete anchoring for bridge expansion joints, shorten the construction period, and further ensure the safety of the bridge structure. Through the blasting safety protection device, it ensures the safety of nearby personnel and passing vehicles during construction, while also absorbing smoke and harmful gases, meeting the requirements of safe and civilized construction. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] Figure 1 This is a schematic diagram of the arrangement of the energy-concentrating follow-up micro-explosion device of the present invention;

[0022] Figure 2 This is a schematic cross-sectional view of the energy-concentrating follow-up micro-explosion device of the present invention;

[0023] Figure 3 This is a schematic diagram of the blasting safety protection device of the present invention.

[0024] Figure 4 This is a cross-sectional view of the blasting safety protection device of the present invention (without the suction and filtering device).

[0025] Explanation of reference numerals in the attached drawings: 1. shaped charge follow-up micro-blasting device; 101. post-charge; 102. connector; 103. pre-charge; 104. fuse; 105. post-charge shaped charge cover; 106. shell; 107. pre-charge shaped charge; 2. steel fiber reinforced concrete; 3. expansion joint; 4. main beam; 5. outer shell; 6. handle; 7. air filter box; 8. flame-retardant sound-absorbing cotton; 9. adsorption tube; 10. negative pressure fan; 11. connecting rod; 12. hydraulic cylinder; 13. caster wheel; 14. frame; 15. wire mesh. Detailed Implementation

[0026] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0027] like Figure 1-4 As shown, a device for rapidly demolishing expansion joints includes a rapidly advancing micro-blasting device 1. Multiple rapidly advancing micro-blasting devices 1 are symmetrically placed at equal intervals on the upper surface of steel fiber reinforced concrete 2, and are located on both sides of the expansion joint 3. The multiple rapidly advancing micro-blasting devices 1 simultaneously blast and demolish the steel fiber reinforced concrete 2 that is fixed to the expansion joint 3. A blasting safety protection device covers the multiple rapidly advancing micro-blasting devices 1 and the steel fiber reinforced concrete 2. This device enables rapid demolition of expansion joints, shortens the construction period, ensures that vehicle traffic efficiency is not affected, and simultaneously controls flying debris, absorbs blasting noise, and filters and adsorbs smoke and harmful gases generated during the blasting process, achieving safe and civilized construction operations.

[0028] like Figure 2As shown, the shaped charge follow-up micro-blasting device 1 includes a rear-stage charge 101, a connecting body 102, a front-stage charge 103, a fuse 104, a rear-stage shaped charge liner 105, a housing 106, and a front-stage shaped charge liner 107. The front-stage shaped charge liner 107 is installed on the bottom inner wall of the housing 106. The front-stage shaped charge 103 is filled inside the front-stage shaped charge liner 107. The top of the front-stage shaped charge liner 107 communicates with the lower surface of the connecting body 102. The upper surface of the connecting body 102 communicates with the lower surface of the rear-stage shaped charge liner 105. The rear-stage shaped charge liner 105 is filled with the rear-stage charge 101. The fuse 104 is installed on the upper surface of the rear-stage shaped charge liner 105. Based on the actual bridge concrete thickness and reinforcement, further research is conducted on the follow-up of the rear-stage charge with the front-stage charge. The time it takes for the explosive to penetrate the hole and reach the bottom is determined by setting a reasonable delay charge and establishing the detonation time difference between the preceding and following charges. Finite element dynamic modeling is used to model the following charge (ring-shaped) to study the influence of parameters such as detonation height, dome angle, explosive type, charge quantity, material, and shape on the penetration range of the shaped charge ring. This yields the optimal design parameters for the charge quantity of the following charge (ring-shaped) under the premise of protecting the foundation boundaries of bridge abutments, back walls, and precast beams. Based on the ring-shaped penetration range of a single shaped charge follow-up micro-blasting device, the relative distance between multiple shaped charge follow-up micro-blasting devices is determined, ensuring that when the shaped charge follow-up micro-blasting device 1 detonates, it only acts on the steel fiber reinforced concrete with expansion joints, without damaging adjacent main beams 4, bridge abutments, back walls, precast beams, and other foundation structures.

[0029] Specifically, the pre-stage shaped charge 107 is conical, and its outer circumferential surface abuts against the inner wall of the housing 106. The rear-stage shaped charge 105 is formed by splicing together the cross-sections of two frustums. The volume of the pre-stage shaped charge 107 is larger than that of the rear-stage shaped charge 105. By setting the pre-stage shaped charge 107 in a conical shape, after the pre-stage charge explodes in the pre-stage shaped charge 105, a detonation wave is formed. The wave surface of the detonation wave continuously advances until it acts on the shaped charge 105. As the detonation wave continues to advance, the various parts of the shaped charge 105 are continuously compressed, causing the metal material that makes up the shaped charge 105 to deform under pressure. It will move forward in a fluid form, gradually forming a metal shaped charge jet with a spherical body and a jet penetrator, and has a very high head velocity. The metal shaped charge jet formed by the pre-stage shaped charge 105 will penetrate a hole in the bridge surface, making it easier for the rear-stage shaped charge 105, which contains the later charge, to enter the hole and detonate.

[0030] Specifically, the fuse 104 integrates a safety module, an energy module, a control module, and an output module. The safety module is limited by mechanical locking or volume interference. The energy module uses a built-in battery or an external power supply, with a built-in battery preferred to eliminate the need for lead wires and external power supply operations. The control module uses Bluetooth or Wi-Fi to receive signal commands, with Bluetooth preferred for signal command transmission and reception. The output module consists of a detonation sequence, which ultimately outputs detonation energy to detonate the pre-charge. The output module is first connected to the pre-charge 103 and then to the post-charge 101. Both the control module and the output module are electrically connected to the energy module.

[0031] In actual field applications, two rows of shaped charge micro-blasting devices are placed at equal intervals on both sides of the expansion joint. Multiple pre-charges are detonated simultaneously. The pre-charge shaped charge liner forms a high-speed, high-temperature, and high-pressure metal shaped charge jet at the bottom of the shell. The metal shaped charge jet penetrates the reinforced concrete, forming multiple holes with a certain depth and diameter on the bridge deck. Furthermore, while the metal shaped charge jet penetrates the reinforced concrete, the subsequent charge and fuse device enter the hole along with the metal shaped charge jet. After the multiple subsequent charges detonate in the hole, the blasted medium (steel fiber reinforced concrete) is destroyed more uniformly, forming a crack along the arrangement direction of the shaped charge micro-blasting device. This effectively protects the integrity of the main beam 4, back wall, and other structures, and facilitates the removal of the expansion joint from the steel fiber reinforced concrete on the bridge deck.

[0032] like Figure 3-4 As shown, the blasting safety protection device includes a cover shell 5, handles 6 are installed on both sides of the upper surface of the shell 5, a suction and filter device is connected to the upper surface of the shell 5, and the suction and filter device is located between the two handles 6. Square through holes are opened on two opposite side walls of the shell 5, and a moving device is provided on the other two opposite side walls of the shell 5. The lower surface of the shell 5 is set as an opening.

[0033] It also includes flame-retardant sound-absorbing cotton 8, frame 14, and wire mesh 15. The flame-retardant sound-absorbing cotton 8 is evenly coated on the inner wall of the outer shell 5, and the flame-retardant sound-absorbing cotton 8 with a telescopic function is set at the square through hole. The main function of the flame-retardant sound-absorbing cotton is to absorb the explosion noise and avoid the explosion noise from affecting nearby personnel and passing vehicles. At the same time, the flame-retardant sound-absorbing cotton on both sides is set as a telescopic structure to ensure that there is enough space for the gas generated after the explosion. The wire mesh 15 is welded on the frame 14. The external volume of the frame 14 is smaller than the internal cavity of the outer shell 5. The outer shell 5 covers the frame 14, and the bottom of the frame 14 is connected to the bottom of the inner side of the outer shell 5.

[0034] Specifically, the frame 14 is welded from angle iron, and the wire mesh 15 has a pore size of 3-5mm, with 3mm being preferred. Setting a layer of wire mesh with a 3mm pore size on the frame can protect against flying rocks from blasting, ensuring that after blasting, flying rocks are controlled within the wire mesh, thus avoiding safety hazards to surrounding buildings, pedestrians, vehicles, etc. caused by flying rock splashes.

[0035] Specifically, the filtration device includes an air filter box 7, an adsorption tube 9, and a negative pressure fan 10. Multiple air filter elements are installed inside the air filter box 7. Activated carbon is placed inside the adsorption tube 9. The air inlet of the air filter box 7 is flexibly connected to the outer shell 5, and the air outlet of the air filter box 7 is flexibly connected to the air inlet of the adsorption tube 9. The air outlet of the adsorption tube 9 is flexibly connected to the negative pressure fan 10. The negative pressure fan 10 is flexibly mounted on the upper surface of the outer shell 5 via foot pads. After the explosion, the negative pressure fan starts working to create a negative pressure state, allowing smoke and dust to enter the air filter box and be filtered by the air filter elements. The filtered gas then passes through the adsorption tube where activated carbon adsorbs harmful gases, ensuring that the gas meets emission standards.

[0036] Specifically, the moving device includes a connecting rod 11, a hydraulic rod 12, and a caster wheel 13. One end of the connecting rod 11 passes through the outer shell 5 and is welded to the frame 14. The other end of the connecting rod 11 is connected to the fixed end of the hydraulic rod 12. The caster wheel 13 is movably mounted on the working end of the hydraulic rod 12. The caster wheel 13 has a locking mechanism. The working end of the hydraulic rod extends downward to lift the frame, facilitating the workers to transport the blasting safety protection device. When the working end of the hydraulic rod is retracted to the fixed end, the frame descends and approaches the bridge surface, achieving the purpose of blocking flying rocks and suppressing dust and noise.

[0037] In addition, it also includes a handheld remote detonator, which combines existing programming technology to achieve automated control. The programming technology is known and can be implemented by those skilled in the art, and will not be described in detail here.

[0038] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0039] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A device for demolition of expansion joints by shaped charge progression, comprising a shaped charge progression micro-blasting device (1), characterized in that: A plurality of the energy-gathering progressive micro-blasting devices (1) are symmetrically placed at equal intervals on the upper surface of the steel fiber concrete (2), and a plurality of the energy-gathering progressive micro-blasting devices (1) are located on both sides of the expansion joint (3), and a plurality of the energy-gathering progressive micro-blasting devices (1) simultaneously blast and demolish the steel fiber concrete (2) fixed with the expansion joint (3), and the upper part of the steel fiber concrete (2) is covered with a blasting safety protection device; The energy-gathering progressive micro-blasting device (1) comprises a rear charge (101), a connecting body (102), a front charge (103), a fuse (104), a rear shaped cover (105), a shell (106) and a front shaped cover (107), the bottom inner wall of the shell (106) is provided with the front shaped cover (107), the front shaped cover (107) is filled with the front charge (103), the top of the front shaped cover (107) is communicated with the lower surface of the connecting body (102), the upper surface of the connecting body (102) is communicated with the lower surface of the rear shaped cover (105), the rear shaped cover (105) is filled with the rear charge (101), and the upper surface of the rear shaped cover (105) is provided with the fuse (104); The front shaped cover (107) is conical, the outer peripheral surface of the front shaped cover (107) abuts against the inner wall of the shell (106), and the rear shaped cover (105) is formed by splicing two circular tables with each other, and the volume of the front shaped cover (107) is greater than that of the rear shaped cover (105); The safety module, the energy module, the control module and the output module are integrated in the fuse (104), the safety module is limited by mechanical locking or volume interference, the energy module adopts a built-in battery or an external power supply, the control module receives signal instructions through Bluetooth or wifi, the output module is composed of a detonation sequence, the output module is connected with the front charge (103) and then connected with the rear charge (101), and the control module and the output module are electrically connected with the energy module; The blasting safety protection device comprises a shell (5) for covering, two handles (6) are installed on the upper surface of the shell (5), a suction filter device is communicated with the upper surface of the shell (5), and the suction filter device is located between the two handles (6), square through holes are formed in the two opposite side walls of the shell (5), moving devices are arranged on the other two opposite side walls of the shell (5), and the lower surface of the shell (5) is provided as an opening. Also include fire -retardant sound -absorbing cotton (8), frame (14) and wire mesh (15), the fire -retardant sound -absorbing cotton (8) is evenly applied on the inner wall of the shell (5), and the fire -retardant sound -absorbing cotton (8) with the function of expansion and contraction is arranged at the square through -hole, the frame (14) is welded with the wire mesh (15), the external volume of the frame (14) is less than the internal cavity of the shell (5), the shell (5) covers on the frame (14), and the bottom of the frame (14) is connected on the bottom of the inner side of the shell (5).

2. A device for removing expansion joints by shaped charge progression according to claim 1, characterized in that: The suction filter device includes an air filter box (7), an adsorption pipe (9) and a negative pressure fan (10), a plurality of air filters are installed in the air filter box (7), activated carbon is placed in the adsorption pipe (9), the air inlet end of the air filter box (7) is flexibly communicated with the shell (5), the air outlet end of the air filter box (7) is flexibly communicated with the air inlet end of the adsorption pipe (9), the air outlet end of the adsorption pipe (9) is flexibly communicated with the negative pressure fan (10), and the negative pressure fan (10) is installed on the upper surface of the shell (5) through a foot pad.

3. A device for removing expansion joints by energy transfer progression according to claim 2, characterized in that: The moving device includes a connecting rod (11), a hydraulic rod (12) and a universal wheel (13), one end of the connecting rod (11) penetrates the shell (5) and is welded on the frame (14), the other end of the connecting rod (11) is connected to the fixed end of the hydraulic rod (12), the working end of the hydraulic rod (12) movably installs the universal wheel (13), and the universal wheel (13) is provided with a locking mechanism.

4. A device for removing expansion joints by energy transfer progression according to claim 3, characterized in that: The frame (14) is welded by angle iron, and the aperture of the wire mesh (15) is 3-5mm.

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